ES2582792T3 - Spray device having an adjustment member for needle valve opening range - Google Patents

Abstract

A spray device (100) for spraying paint from a paint ejection hole (122) which is provided with: a nozzle (114) having a paint ejection hole (122) for atomizing and expelling paint; a needle (150) to open and close the hole (122) of paint ejection; a front piston (170) that is fixed to the needle (150); a needle spring (174) which is provided so as to push the front piston (170) towards the paint ejection hole (122); a gun body (112) that accommodates the nozzle (114) and accommodates the front piston (170); a rear body (190) that is disposed at the rear of the gun body (112); a mechanism for adjusting the position of the needle to adjust the position of the needle (150) in one direction along the central axis of the nozzle (114), and a support unit (210) that is fixed so that it can be separated to the gun body (112); when the support unit (210) is fixed to the gun body (112), the paint and air contained in the support unit (210) flow through the gun body (112); characterized in that the needle position adjustment mechanism includes an adjustment member that is rotatable with the central axis of the nozzle (114) in the center, and a rotation position adjustment member to adjust the position of the piston front (170) along the central axis of the nozzle (114) corresponding to the angle of rotation of the adjusting member, and the needle position adjustment mechanism is configured such that when the front piston (170) moves along with the needle (150) along the central axis of the nozzle (114) in a direction away from the paint ejection hole (122) in a state in which the amount of paint discharge leaving the hole (122) of paint ejection has been adjusted, the front piston (170) and the needle (150) meet and the needle moves away from the hole (122) of paint ejection to open the hole.

Description

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DESCRIPTION

Spray device that has an adjustment member for needle valve opening range TECHNICAL FIELD

The present invention relates to a spray device for spraying paint on an object to be coated. More specifically, the present invention relates to a spraying device in which the needle can move in the axial direction. The present invention also relates to a spraying device that can spray not only paint but also different types of liquids, including water, adhesives, oxide formation prevention agents, insulating agents, coating agents and drugs on an object that has if sprayed, and that is provided with a manual adjustment member (adjustment button).

PREVIOUS TECHNIQUE

With automatic plate-type guns, which are spray devices for spraying paint on an object to be coated, one or more of these guns are normally provided in a coating line as automatic coating spray guns. There are many types of lines, such as suspended or ground type conveyors, and there are also lines in which the speed of the conveyor is fixed and lines of public type. In addition, the objects to be coated can be moved individually, the objects to be coated can be forced to rotate, a plurality of objects to be coated can be suspended from the same hanger, or a plurality of objects to be if coated, they can be aligned in a circular manner and rotated in a dicle type line.

The method of arranging automatic spray guns may involve a fixed system, robots can be made to support the automatic spray guns, one or more automatic spray guns can be mounted on a device known as an "reciprocating motion motor or in vaiven ”That moves vertically or longitudinally (from the front to the back) in the same straight line, or the previous configurations can be combined.

The real user normally handles a range of objects that are to be coated, and objects that are to be coated that are the same that are often divided for coating with many different colors. It is also known that there are different shapes and sizes of objects to be coated.

The coating involves a primer or a base coat, and use is made of various coatings such as single-color coatings known as solid coatings, metal coatings (usually aluminum powder), pearl coatings, mica coatings, bead coatings (glass), clear (transparent) coatings, and light colored (transparent colored) coatings. The solvent can be solvent-based, or of the very solid type (with a small proportion of solvent) or water-based, etc. Many different types of resin can be used, such as melamine, fluorine, acrylic or urethane. The coating process may involve a lower layer, an intermediate layer and an upper layer, and such processes involve different operations and requirements.

For example, a first type of conventional system has a configuration in which a spray gun is provided with a displacement mechanism of the remote control type that allows a plug to be displaced between two preset positions, and the opening degree of the hole Discharge can be controlled remotely in two stages, in particular fully open and semi-open (see Patent Document 1).

A second type of conventional system has a configuration in which a first starting position of the rear end of a needle valve is momentarily lowered to a second starting position of the rear end of the needle valve by releasing the actuating force of a cylinder, and the matter accumulated within an expulsion flow path is discharged, after which the cylinder is actuated to instantly return to the first starting position of the rear end of the needle valve, whereby the amount Initial established coating is restored. The position of the end part when the cylinder piston has advanced is adjusted by a piston leading end adjustment screw (see Patent Document 2).

In a third type of conventional system, a spray device is provided with a gun unit for atomizing paint for expulsion, and a support unit for receiving paint and air. The support unit is fixed so that it can be separated from the gun unit. The paint is ejected from a paint ejection hole by the movement of a nozzle opening / closing valve to the rear (see Patent Document 3).

A fourth type of conventional system has a configuration in which the rear end of a needle valve in a spray gun is fixed by a screw to a first piston that is arranged at the rear, and a second piston is arranged in the front part of the first piston. Compressed air is supplied to a first air supply passage that causes the first piston to move, or compressed air is supplied to a second air supply passage that causes the second piston to move, so that the amount is changed of movement of the needle valve and variable amounts of discharge are produced (see Patent Document 4).

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In a fifth type of conventional system, a first control member that can be adjusted to the front and back by a screw is provided in a cylinder end cover. The tip end of the first control member is made to respond to an elastic receiving member. A second control means that can be adjusted from the outside by a screw is connected by a screw and provided in the elastic receiving member (see Patent Document 5).

In a sixth type of conventional system, a first control member that can be adjusted to the front and back by a screw is provided in a cylinder end cover. The tip end of the first control member is made to respond to an elastic receiving member. A second control means that can be adjusted from the outside by a screw is connected by a screw and provided in the elastic receiving member (see Patent Document 6).

In a seventh type of conventional system, an opening / closing valve with a flow control function is provided with a long spring and a short spring as reversing springs. Increases and reductions in pilot air pressure are used to open a needle valve body in stages, thereby adjusting the flow rate (see Patent Document 7).

In an eighth type of conventional system, a needle valve body in a needle valve for supplying paint is switched between an open position of small flow passage and an open position of large flow passage (see Patent Document 8) .

A ninth type of conventional system has a configuration in which, in a needle valve for a spray gun, a second piston is moved to a locked position provided in a first piston by pumping air to a second cylinder chamber so that A paint discharge hole is semi-open. The first piston is displaced together with the second piston by pumping air to a first cylinder chamber so that the paint discharge port is fully open (see Patent Document 9).

A tenth type of system has a threaded back module on the back of a needle. The module can be unscrewed so that the needle is removed from the gun (see Patent Document 10).

DOCUMENTS OF THE PREVIOUS TECHNIQUE

[Patent Document 1] Japanese Unexamined Patent Application Publication S59-62360

[Patent Document 2] Japanese Unexamined Patent Application Publication 2003-205258

[Patent Document 3] Japanese Unexamined Patent Application Publication 2008-649

[Patent Document 4] Japanese Unexamined Patent Application Publication 2008-12404

[Patent Document 5] Japanese Utility Model Application Publication Examined S63-38929

[Patent Document 6] Japanese Unexamined Utility Model Application Publication S60-13264

[Patent Document 7] Japanese Unexamined Utility Model Application Publication H5-71547

[Patent Document 8] Japanese Utility Model Application Publication Examined H3-36779

[Patent Document 9] Japanese Utility Model Application Publication Examined S48-14667

[Patent Document 10] Published Spanish Application ES 2,208,083.

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

Considering the above, frequent changes and cleaning operations with spray devices have been anticipated, and it is desirable that such color and cleaning changes be carried out quickly and reliably in an automatic manner. When spraying guns are checked in conventional spray coating devices, it is necessary to remove the nozzle from the body of the spray gun. Another point with conventional spray coating devices is that the piston members and the body members have a complex structure, which means that production and assembly require a great deal of time.

Looking at fig. 19, a conventional adjustment type spray coating device 900 has a gun body 910 and a rear body 930. A fluid tip 912, a needle 914, and a front piston 916 are arranged in the gun body 910. The front piston 916 is pushed forward by means of a spring 918. A front piston seal 920 closes (seals) the front piston 916 and the gun body 910.

The degree of opening (clearance) of the fluid tip 912 and the needle 914 can be adjusted by means of a button

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Adjustment 932 and a lock nut 934 that are arranged on the back. With this spray coating device 900, the coating is carried out by adjusting the degree of opening of the needle 914 during coating to a position in which the adjustment button 932, which is the adjustment member, is turned to 1.5 from fully open, or to a position in which the adjustment button 932 is turned to 2.0 from fully open. When a color change is required for the object that is being coated on the coating line, a cleaning process is carried out, and the coating apparatus (spray coating device) is filled with paint of a color different from that of the coating. paint color that was being coated to that point. At that time, when the degree of opening (clearance) of the fluid tip 912 and the needle 914 is narrow, cleaning (solvent use) takes a long time and leads to production losses and therefore the adjustment button it is often adjusted for a time during cleaning to the fully open position, in other words to a position in which it has been turned to 4.0 or 5.0.

The problem in this case is that once the cleaning process is completed, the degree of opening (clearance) of the fluid tip 912 and the needle 914 needs to be returned to the original state, but the conventional adjustment button 932 employs a spring system, and the adjustment button 932 has a structure that is fixed by means of the lock nut 934, and therefore it is difficult to reliably adjust the adjustment button 932 to its original position, and the adjustment it takes a lot of time. If the adjustment button 932 is set incorrectly, the amount of paint sprayed from the spray coating device 900 fluctuates, and there is a risk of coating defects occurring.

The purpose of the present invention is to provide a spray device in which coating operations can be carried out efficiently when the spray device nozzle is being cleaned, and in which the time needed to change the paint is shortened and the device can handle paint operations that involve a large number of colors.

A further purpose of the present invention is to provide a spraying device that makes it possible to adjust the amount of paint ejected simply and in a short time.

A further purpose of the present invention is to provide a spraying device that can be easily produced and assembled.

A further purpose of the present invention is to provide a spraying device that can be easily performed with any of the structures of the conventional adjustment type, the type of two-stage air type stretching and the manual multi-stage type.

MEANS TO SOLVE THE PROBLEMS

The present invention relates to a spray device for spraying paint from a paint ejection hole, which is provided with: a nozzle having a paint ejection hole for atomizing and expelling paint; a needle to open and close the paint ejection hole; a front piston that is fixed to the needle; a needle spring that is provided so as to push the front piston toward the paint ejection hole; a gun body that accommodates the nozzle and accommodates the front piston; a rear body that is disposed on the back of the gun body; a needle position adjustment mechanism to adjust the position of the needle in one direction along the central axis of the nozzle; and a support unit that is fixed so that it can be separated from the gun body.

When the support unit is attached to the gun body, the paint and air contained in the support unit flow through the gun body. The needle position adjustment mechanism includes an adjustment member that can rotate with the central axis of the nozzle in the center, and a rotation position adjustment member to adjust the position of the front piston along the central axis of the nozzle in correspondence with the rotation angle of the adjustment member.

The needle position adjustment mechanism is adjusted so that when the front piston moves along with the needle along the central axis of the nozzle in a direction away from the paint ejection hole in a state in which the Amount of discharged paint coming out of the paint eject hole has been adjusted, the front piston and needle meet and move away in one direction of the paint eject hole. The spray device that has this configuration is simple to disassemble, assemble, maintain, and the components in the gun body are simple to replace. With the spraying device according to the present invention, the amount of paint discharged can be easily adjusted, and the nozzle can be cleaned effectively.

With the spraying device according to the present invention, the needle position adjustment mechanism includes an adjustment button that can rotate with the central axis of the nozzle in the center, and a rotating plug to adjust the position of the piston frontal along the central axis of the nozzle in correspondence with the angle of rotation of the adjustment member. The outer peripheral part of the cylindrical section of the front piston is slidably disposed within the inner peripheral part of the cylindrical section of the rotating plug.

With the spraying device according to the present invention, a plurality of countersunk holes are

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formed in the rotating plug, and a positioning pin of the rotating plug can be positioned in the countersunk holes by moving the adjustment button in the direction along the central axis of the nozzle and causing the adjustment button to rotate.

The spraying device according to the present invention can also be used in a fixed system; It can also be used in a system in which a robot has been made to support an automatic spray gun; it can be used in a system in which one or more automatic spray guns are mounted on a device known as an "reciprocating or reciprocating motion motor"; or it can be used in a system that combines the previous configurations.

When coating operations are carried out with the spraying device according to the present invention, the needle position adjustment mechanism is used to force the adjustment member to rotate with the central axis of the nozzle in the center. , so that the position of the front piston along the central axis of the nozzle is adjusted in the position of the coating operation. The air that drives the front piston is then sent to the gun unit from an air supply source that drives the front piston, and the needle is moved back and the paint is ejected from the paint ejection hole. At this point, atomized air is introduced from an atomized air supply source, and atomized air is ejected from an atomized air hole so that the paint that has been ejected from the paint ejection hole can be atomized. Also at this point, the standard air is introduced from a standard air supply source and the standard air is expelled from a standard air hole so that an atomized paint pattern can be formed. The remaining paint that has not been ejected from the paint ejection hole can be returned to the paint supply source (or paint reservoir). It is possible in this way to build a paint circulation line.

When there is metallic or similar powder content in the paint, as with metal paints, then if the paint circuit remains closed for a long time, the heavier content tends to settle (precipitate), and there is a risk of paint defects and blockage or obstruction of the paint circuit. In such cases, therefore, a structure of the circulation type is preferred. It is also possible to adopt a non-circulation type configuration that does not have a return path. The spraying device according to the present invention can also be used to automatically or manually spray not only paint, but different types of liquids, including water, adhesives, oxide forming prevention agents, insulating agents, coating agents and drugs. .

When the nozzle of the spray gun body in the spray device according to the present invention is cleaned, the needle position adjustment mechanism is used to force the adjustment member to rotate with the central axis of the nozzle in the center so that the position of the front piston along the central axis of the nozzle is adjusted in the cleaning operation position. Although air is introduced that drives the front piston from an air supply source that drives the front piston into a chamber that drives the front piston, a state is maintained in which the needle and the front piston meet and move backwards along the central axis of the nozzle in resistance to the elastic force of the needle spring. The nozzle can be cleaned in this state.

EFFECTS OF THE INVENTION

With the spraying device according to the present invention, it is possible to adjust the amount by which the needle can move backward from the closed nozzle state to the clean state so that it is large enough. This means that the cleaning operation can be carried out efficiently when the spray device nozzle is cleaned, and the downtime of the coating operations can be shortened. In addition, with the spraying device according to the present invention, the time required to change the paint can be shortened, and it is possible to deal with the painting operations involving a large number of colors. In addition, the spraying device according to the present invention has a unitary structure that can be separated, and therefore it is simple to produce and assemble each of the components that constitute the unit.

In addition, the spraying device according to the present invention has the configuration described above, and therefore the cleaning time is significantly reduced and improved performance can be achieved in terms of significantly improved operational efficiency, inter alia, compared to a conventional spraying device. With conventional spray devices, it is necessary to open a manual button when "fully open" is required. Therefore, in most cases when the needle position has to be returned to the original position, the readjustment needs to be carried out manually and depends on the sensitivity and vision of the operator.

In addition, the spraying device according to the present invention can be easily realized with any of the three types of conventional spraying devices, in particular devices of the type of adjustment, of the type of stretching in two stages of type of air and of the type Multi-stage manual. By introducing spray devices such as these three types, each user of the spray device can select the type of spray device to combine the type of line, the condition of the equipment, color changes in objects to be coated (products), and type of paint used, etc., and it is also possible to use several types of spray device together. That is, it is possible to increase the value of the objects to be coated by

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of a synergistic effect achieved using three types of spray device, making it possible to achieve a distinction with standard products and making it possible to facilitate the sale of the products in advance.

In addition, with a manual multi-stage type spraying device according to the present invention, there is an air circuit less than with a two-stage air type type spraying device (the same as with a device of spraying of the conventional setting type), and therefore when a spraying device of the conventional setting type is being used, it is possible to replace this with a spraying device of the manual multi-stage type according to the present invention without adding an air circuit

BRIEF DESCRIPTION OF THE FIGURES

Fig. 1 is a longitudinal sectional view showing the structure of a spraying device in the closed nozzle state, in accordance with an embodiment of the present invention;

Fig. 2 is a front view showing the structure of the gun unit, in accordance with an embodiment of the present invention;

Fig. 3 is a side view showing the structure of the spraying device, in accordance with an embodiment of the present invention;

Fig. 4 is a rear view showing the structure of the gun unit, in accordance with an embodiment of the present invention;

Fig. 5 is a rear view showing the structure of the gun unit and the support unit, in accordance with an embodiment of the present invention;

Fig. 6 is a longitudinal sectional view showing a structure containing the flow passage of the spraying device, in accordance with an embodiment of the present invention;

Fig. 7 is a schematic cross-sectional view showing the arrangement of the flow passages of the spraying device, in accordance with an embodiment of the present invention;

Fig. 8 is an exploded assembly drawing showing the structure of the rear body, the rotating cap and the adjustment button, in accordance with an embodiment of the present invention;

Fig. 9 shows the structure of the rear body, of the rotating plug and of the adjustment button, according to an embodiment of the present invention, where fig. 9 (a) is a front view, fig. 9 (b) is a cross-sectional view, fig. 9 (c) is a side view, and fig. 9 (d) is a rear view;

Fig. 10 is an oblique view showing the structure of the rotating cap, in accordance with an embodiment of the present invention;

Fig. 11 shows the structure of the rotating cap, according to an embodiment of the present invention, where fig. 11 (a) is a front view, fig. 11 (b) is a cross-sectional view, fig. 11 (c) is a side view, and fig. 11 (d) is a rear view;

Fig. 12 shows the structure of the adjustment button, according to an embodiment of the present invention, where fig. 12 (a) is a front view of the adjustment button, fig. 12 (b) is a cross-sectional view of the adjustment button, fig. 12 (c) is a side view of the adjustment button; and fig. 12 (d) is a rear view of the adjustment button;

Fig. 13 is a longitudinal sectional view showing the structure of the spraying device in the state of the first discharge amount of the nozzle, in accordance with an embodiment of the present invention;

Fig. 14 is a longitudinal sectional view showing the structure of the spraying device in the state of the second discharge amount of the nozzle, in accordance with an embodiment of the present invention;

Fig. 15 is a longitudinal sectional view showing the structure of the spraying device in the state of the third discharge amount of the nozzle (cleaning state of the nozzle), in accordance with an embodiment of the present invention;

Fig. 16 is a longitudinal sectional view showing the structure of the spraying device in a state in which the nozzle is closed when a spraying device of the type of stretching in two stages of air type is configured using the gun unit according to with the present invention;

Fig. 17 is a longitudinal sectional view showing the structure of the spray device with the nozzle in a first open state when a spray device of the type of stretching in two stages of air type is configured using the gun unit according to the present invention;

Fig. 18 is a longitudinal sectional view showing the structure of the spray device with the nozzle in

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a second open state (cleaning state of the nozzle) when a two-stage air type spraying device is configured using the gun unit in accordance with the present invention; Y

Fig. 19 is a longitudinal sectional view showing the structure of the spray device in a state in which the nozzle is closed in a conventional adjustment spray device;

MODE OF EMBODIMENT OF THE INVENTION

(1) Spray device configuration:

An embodiment of the present invention will be described below in combination with the figures. The embodiment of the present invention described below refers to a spraying device for spraying paint on an object, but it should be noted that the spraying device according to the present invention can be widely applied, not only to paint. , but also to different types of liquids, including water, liquid type adhesives, liquid type oxide formation agents, liquid type insulating agents, liquid type coating agents and liquid type drugs.

The spraying device according to the present invention can be referred to as a spraying device of the "manual type of two-stage stretching", but in this case "stretching in two stages" means both an arbitrary position (stretching backwards of the needle) as the CLEAN position. The spraying device according to the present invention therefore refers to a "multi-stage manual type" spraying device in which the needle can be adjusted in a plurality of positions. The embodiment of the spraying device according to the present invention which will be described below refers to a spraying device in which the needle can be adjusted in three positions (a position in which a first amount of discharge can be ejected, a position in which a second discharge quantity can be ejected, and a cleaning position), but it should be noted that the spray device according to the present invention can also be applied to a spray device in the that the needle can be adjusted in two positions, or it can be applied to a spraying device in which the needle can be adjusted in three or more positions (a position in which a first amount of discharge can be ejected, a position in that a second amount of discharge can be expelled, ..., a position in the amount of discharge can be ejected, and a position n cleaning).

Looking at Figs. 1 to 3, which show an embodiment of the present invention, a spray device 400 for spraying paint on an object to be coated from a paint ejection hole of a nozzle is provided with a gun unit 110 for atomizing and expelling paint, a support unit 210 that constitutes a manifold for receiving paint and air, and a rear body 420. The support unit 210 is designed so that it can be fixed so that it can be separated to the gun unit 110 using a unit fixing device such as a bolt 220 with a hexagonal hole. For example, the support unit 210 is arranged on one side of the gun unit 110. The rear body 420 is disposed on the rear of the gun unit 110.

(2) Gun unit configuration:

Looking at Figs. 1 to 4, the gun unit 110 is provided with a gun body 112 constituting a base member; a nozzle 114 that is supported on the front of the gun body 112; an air cap 120 that is supported on the front of the nozzle 114; a retaining ring 128 that supports the air cap 120 on the gun body 112; and the rear body 420 which is disposed at the rear of the gun body 112. The gun body 112 is preferably formed from technical or engineering plastic that is nidged and resistant to solvents.

The gun body 112 is formed of POM (polyoxymethylene), for example. The rear body 420 is preferably formed of POM (polyoxymethylene), for example. POM (polyoxymethylene) is solvent resistant and can be faced with aqueous systems. This structure makes it possible to reduce the weight of the gun body 112. If several spray devices are mounted on a robot or an alternative motion motor, there may be limitations on the weight of load (load capacity) or in the operating range, in which case it is necessary to reduce the weight of the gun body 112. In addition, if there is no need to reduce the weight, it is possible to use a conventional article made of aluminum (treated alumita), stainless steel or heat treated stainless steel.

A dowel pin 112P to guide the support unit 210 is provided on the lower surface of the gun body 112. A female threaded part 112F to firmly thread the bolt 220 into a hexagonal hole that fixes the support unit 210 is provided in the lower surface of the gun body 112. Only a horn pin 112P is shown, but two dowel pins 112P are preferably provided. There may be a 112P crane pin, or there may be two.

Here, the terms "front" and "in front" refer to the direction in which the paint is ejected from the gun unit 110. In addition, "back" and "behind" refer to the direction opposite to the direction in which the paint is ejected from the gun unit 110.

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The nozzle 114 has a cylindrical shape and dictates the central axis 114A of the nozzle. The nozzle 114 includes a nozzle body 114B and a nozzle tip 114C. The tip end of the nozzle tip 114C has a conical shape. The nozzle tip 114C is preferably formed of tungsten alloy. The nozzle body 114B is supported on the gun body 112 by means of a first threaded reinforcement ring 115 and a second threaded reinforcement ring 116. A first stopper pin 117 positions the second threaded reinforcement ring 116 in the body of gun 112. The first threaded reinforcement ring 115 is positioned further ahead than the second threaded reinforcement ring 116 and outwardly thereof. The first threaded reinforcement ring 115 is preferably fixed to the gun body 112 by a secure fastener using a pin (not shown). Helical inserts (commercially available threaded reinforcement components) are preferably used for the threaded part of the gun body 112.

Looking at Figs. 1 and 2, a paint ejection hole 122 is provided to eject paint at the tip end of the nozzle tip 114c. The inside of the nozzle 114 is designed to allow the flow of liquid paint. The air cover 120 has an auxiliary orifice 124 of atomized air. The tip end of the nozzle 114 is disposed within the nozzle hole of the air cap 120. The central axis of the paint ejection hole 122 is located on the central axis 114A of the nozzle. The center of the nozzle orifice of the air cap 120 is located on the central axis 114A of the nozzle. An air hole pattern 126 is provided to expel air in order to form a pattern with the paint that has been atomized and ejected from the paint ejection hole 122. A plurality of pattern air holes 126 are preferably arranged concentrically with the central axis 114A of the nozzle in the center.

A plurality of auxiliary orifices 124 of atomized air are preferably arranged concentrically with the central axis 114A of the nozzle in the center. Alternatively, a plurality of auxiliary orifices 124 of atomized air may be arranged concentrically around a first radius with the central axis 114A of the nozzle in the center, and may also be arranged concentrically around another radius other than the first radius (second radius or second and third spokes, etc.) with the central axis 114A of the nozzle in the center.

Looking at Fig. 1, the gun unit 110 is provided with a nozzle opening / closing valve, that is, a needle 150, for opening and closing the paint ejection hole 122; a needle seal kit 160 that is disposed within the gun body 112 and supports the needle 150; and a front piston 170 that is disposed on the back of the needle seal kit 160 within the gun body 112. The needle seal kit 160 is disposed on the back of the nozzle 114. The needle 150 includes a needle tip 150C that is positioned on the front, and a needle main body 150B that is positioned on the back. The back of the needle tip 150C is fixedly fixed on the front of the main needle body 150B. The central axis of the needle tip 150C is located in the central axis 114A of the nozzle. The central axis of the main needle body 150B is located in the central axis 114A of the nozzle. Accordingly, the central axis of the nozzle 150 is located in the central axis 114A of the nozzle.

Needle tip 150C is preferably formed from a tungsten alloy. The main needle body 150B is preferably formed of stainless steel (SUS304, for example) and is preferably subjected to a hard chromium treatment. By forming the 150C needle tip of tungsten alloy it is possible to significantly improve durability compared to conventional components that are formed of SUS303. This constitution makes it possible to prevent dripping caused by wear (in other words a defect that is a type of coating problem caused by liquid leaks from the tip end of the nozzle). At the same time, this constitution makes it possible to simplify the maintenance of the needle 150 and delay the time at which the needle 150 needs replacement. In addition, if the main needle body 150B undergoes a hard chromium treatment, it is possible to avoid problems caused by liquid leaks from the sealing part of the needle due to wear of the main needle body 150B, and this makes possible simplify the maintenance of the needle 150 and delay the time when the needle 150 needs replacement.

A third threaded reinforcement ring 142 is fixed to the gun body 112 by means of a third threaded reinforcement ring stop pin 140. The third threaded reinforcement ring 142 has a female threaded portion for fixing the needle seal kit 160 by threading. The needle seal kit 160 has a threaded portion so that it can be fixed by threading. By threading the threaded part of the needle seal kit 160 into the female threaded part of the third threaded reinforcement ring 142 it is possible to fix so that the needle seal kit 160 can be separated from the gun body 112.

The 160 needle seal kit includes: a 160m collarm; a sealing cap 160B positioned at the rear; a first general seal 160C; a sealed housing 160D; a first toric joint 160E; a second general seal 160F; a second 160G toric joint; and a 160H front seal positioned on the front. The central axis of the needle seal kit 160 is located in the central axis 114A of the nozzle. The second 160G toric joint is positioned later than the first 160E toric joint. The second general seal 160F is positioned later than the first general seal 160C. The second general seal 160F is held in front of the seal housing 160D by means of the frontal seal 160H. The first general seal 160C is held inwardly at the rear of the seal housing 160D by means of the seal cap 160B. The sealing cap 160B is held inwardly at the rear of the seal housing 160D by means of the

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collar 160A The second general seal 160F and the first general seal 160C are provided in order to seal the seal housing 160D and the needle main body 150B. The first toric seal 160E and the second toric seal 160G are provided in order to hermetically close the seal housing 160D and the gun body 112.

The first toric joint 160E and the second toric joint 160G are preferably perfluoro toric joints. Rubber-based materials generally have low solvent resistance and there is a high possibility of deformation and expansion. When the product is mainly to be applied for coating and solvents are used for repair and maintenance, perfluoro is preferably used in order to avoid problems in terms of not being able to mount the toric joints or that the toric joints do not move.

The needle seal kit 160 has a structure such that it can be replaced by removing it as a single piece, and therefore the maintenance of the gun is simplified. Two V-shaped seals that are used in the needle seal kit 160 have low slip resistance and therefore serve to prevent liquid leakage caused by friction with the main needle body 150B and to improve durability. The frontal seal 160H is a component that doubles the frontal sealing function in front V (liquid sealing function), and the sliding resistance of the liquid (hermetic closing state) can be adjusted using the fixing state of the kit 160 Hermetic needle closure. Accordingly, the structure of the frontal seal 160H is such that when worn out, a liquid seal function is demonstrated by increasing its fixing amount. That is, the needle seal kit 160 is fixed and the tip end of the frontal seal 160H is crushed so that a liquid seal function is demonstrated.

The two toric joints on the outer side of the needle seal kit 160, in other words the first toric joint 160E and the second toric joint 160G, are such that the second frontal-lateral toric joint 160G demonstrates a closing function airtight liquid (paint), and the posterior-lateral toric joint 160E demonstrates a function of air tight seal with the gun body 112. Accordingly, this configuration makes it possible to significantly improve the durability of the needle seal kit 160, to simplify the maintenance of the needle seal kit 160 and delay the time at which the needle seal kit 160 needs replacement.

The front piston 170 is provided so as to be able to move along the central axis 114A of the nozzle. The front piston 170 is arranged on the back of the needle seal kit 160. The front piston 170 includes a front piston shaft 170A, a front piston flange 170F that is provided on the front of the front piston shaft 170A, and a part 170G that receives the front piston seal that is provided on the periphery 170F outer flange front piston. A front piston hole 170H is provided in the front of the front piston shaft 170A. A rear shaft portion 150D that is provided on the rear of the main needle body 150B is fitted in the front piston hole 170H and fixedly attached thereto.

A frontal piston seal 170C is disposed within a groove in the part 170G that receives the frontal piston seal. The front piston seal 170C is provided in order to hermetically close a front piston main body 170B and the gun body 112. The front piston seal 170C is preferably made of perfluoro. This constitution makes it possible to reduce slip resistance and improve durability.

The front piston main body 170B may be formed of A2021 aluminum alloy (a student treatment can be carried out, for example). A chamber 176 that drives the front piston is configured inside the gun body 112, at the front of the front piston 170.

A needle spring 174 is provided in order to push the front piston main body 170B forward. The needle spring 174 may be formed by a helical spring made of stainless steel (SUS304, for example). The needle spring 174 is disposed on the outer side of a rear shaft portion 170D of the front piston main body 170B. The rear section of the needle spring 174 is arranged so that it contacts a flat section that faces the front of a rotating plug 450 (which will be described later). The front section of the needle spring 174 is arranged so that it makes contact with a section facing the rear of the front piston flange 170F of the front piston main body 170B. The central axis of the needle spring 174 can be found in the central axis 114A of the nozzle. The front piston 170 is subjected to a force in a forward movement direction by means of the elastic force of the needle spring 174. Accordingly, when no compressed air has been introduced into the drive chamber 176 of the front piston, the piston front 170 moves forward and the needle tip 150C of the needle 150 is designed to close the paint ejection hole 122.

Looking at Figs. 1 to 4, the rear body 420 is fixed to the rear end of the gun body 112 by screwing, using fastening bolts 192A, 192B of the rear body. As shown, the rear body 420 may be fixed to the gun body 112 using two fastening bolts 192A, 192B of the rear body, for example. The two fastening bolts 192A, 192B of the rear body can be arranged symmetrically around a point such that there is an angular interval between them of 180 ° with the central axis 114A of the nozzle in the center. There may be one, two or more rear body fixing bolts. When several rear body fixing bolts are used, said rear body fixing bolts may be arranged in such a manner.

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so that there is an equal angular interval between them with the central axis 114A of the nozzle in the center.

The gun unit 110 is also provided with an adjustment button 430 that constitutes the adjustment member for adjusting the position of the needle 150 along the central axis 114A of the nozzle, and a rotating plug 450 for determining the position of the button of adjustment 430 in the direction of rotation. The adjustment button 430 is designed to be able to rotate with the central axis 114A of the nozzle in the center. The adjustment button 430 is arranged on the back of the rear body 420.

Looking at Figs. 8 and 9, the rear body 420 includes a base part 422, an annular front recess 424 that is formed on the front side of the base part 422, and an annular rear projection 426 that is formed on the rear side of the part of base 422. Two holes 426A, 426B for screws are formed in the base part 422. Two holes 420A, 420B for bolts may be provided in positions where they are symmetrical about a point such that there is an angular interval between 180 ° with the central axis 114A of the nozzle in the center. A central hole 420H with a rear body is formed in the base part 422 with the central axis 114A of the nozzle in the center. The two screw holes 426A, 426B can be arranged symmetrically around a point such that there is an angular interval between them of 180 ° with the central axis 114A of the nozzle in the center. Two positioning pins 432A, 432B of rotating cap are fixed vertically with respect to a surface facing the front inside the rear projection 426 of the rear body 420, by means of pin fixing screws 440A, 440B. That is, the positions in the centers of the two positioning pins 432A, 432B of rotating plug are the same as those of the centers of the holes 426A, 426B for screws, respectively.

Looking at Figs. 8 to 11, the rotating cap 450 is disposed within the front recess 424 in the rear body 420. The rotating cap 450 includes a disc-shaped base part 452, a front annular shaft portion 453 that is formed on the front side of the base part 452, and a rear column tree part 454 which is formed on the rear side of the base part 452. A front hole part 455 is formed in the central part of the base part 452 and in the front shaft portion 453. A locking screw portion 456 of the adjusting button is formed in the central part of the rear shaft portion 454. Two positioning holes 457A, 457B of rotating plug are formed in the rear shaft portion 454, in the area surrounding the locking screw portion 456 of the adjustment button. In the embodiment shown, two rotating plug positioning holes are provided, but they can be one, or two or more of these rotating plug positioning holes. Furthermore, instead of providing the rotating plug positioning holes it is possible to employ a different positioning structure comprising a recess and a projection, or a structure may be formed such that the rear part of the rotating plug configures the adjustment button . The plurality of positioning holes 457A, 457B of rotating plug may be provided symmetrically about a point that takes the central axis of the rotating plug 450 as a reference. The front ends of the rotating column stopper pins 468A, 468B are arranged in the respective rotating stopper positioning holes 457A, 457B.

Looking at fig. 8, 420M marks showing "CLEAN", "1.5", "2.0", "CLEAN", "1.5", "2.0" indicating the position of the needle 150 are formed on the surface posterior of the posterior body 420 at angular intervals of 60 °, for example. The “CLEAN” mark indicates the CLEAN position (corresponding to the cleaning position, which means a 4.5 mm needle withdrawal). The "1.5" mark indicates the first discharge quantity position (which corresponds to the small amount of discharge position, which means a 1.5 mm needle withdrawal). The "2.0" mark indicates the second discharge quantity position (which corresponds to the large amount of discharge position, which means a 2.0 mm needle withdrawal). Using these three types of 420M marks it is possible to confirm the three adjustment positions of the rotating cap 450 in the direction of rotation.

Six countersunk holes 461-466 are formed on the rear side of the base portion 452 of the rotating plug 450 as "non-through holes (blind holes)". The central positions of the six countersunk holes 461-466 can be found at equal angular intervals relative to each other and at equal distances by taking the central axis of the rotating plug 450 as a reference. However, the inside diameters of the countersunk holes 461-466 are preferably of the same size. The first countersunk hole 461 and the fourth countersunk hole 464 are formed to have equal depths. The second countersunk hole 462 and the fifth countersunk hole 465 are formed to have equal depths. The third countersunk hole 463 and the sixth countersunk hole 466 are formed to have equal depths. The first countersunk hole 461 and the fourth countersunk hole 464 are provided symmetrically about a point with the central axis of the rotating plug 450 as a reference. The second countersunk hole 462 and the fifth countersunk hole 465 are provided symmetrically about a point with the central axis of the rotating plug 450 as a reference. The third countersunk hole 463 and the sixth countersunk hole 466 are provided symmetrically about a point with the central axis of the rotating plug 450 as a reference.

In the embodiment shown, there are each two of the countersunk holes that have three different depths. For example, the first countersunk hole 461 and the fourth countersunk hole 464 are formed with a depth of 3.5 mm and are set as the CLEAN position (corresponding to the cleaning position, which means a withdrawal of the needle from 4.5 mm) The second countersunk hole 462 and the fifth countersunk hole 465 are formed with a depth of 1.0 mm and are set as the second discharge quantity position

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(which corresponds to the large amount of discharge position, which means a 2.0 mm needle withdrawal). The third countersunk hole 463 and the sixth countersunk hole 466 are formed with a depth of 0.5 mm and are set as the first discharge quantity position (corresponding to the small amount of discharge position, which means a withdrawal 1.5 mm needle).

Looking at Figs. 8, 9 and 12, the adjustment button 430 is arranged on the rear side of the rear shoulder 426. The adjustment button 430 includes a disc-shaped base part 432, a front recess 434 that is formed on the front side of the base part 432, and an annular front axle part 435 which is formed on the front side of the base part 432, within the front recess 434. A central hole 436 is formed on the front part of the base part 432 and on the front shaft portion 435. An adjustment button lock screw plate 438 is formed in the central part of the base 432. The rear projection 426 that is formed on the rear side of the rear body 420 has a size and a shape that allows it to move inside the front recess 434 of the adjustment button 430.

Two holes 437A, 437B of rotating stopper pin are formed in the front shaft portion 435 in the area surrounding the central hole 436. In the embodiment shown, there are two rotating stopper pin holes, but one can be provided. , or two or more rotating plug pin holes. The plurality of holes 437A, 437B of rotating stopper pin may be provided symmetrically about a point with the central axis of the rotating stopper 450 as a reference. The positions in which the rotating plug pin holes 437A, 437B are provided are determined such that they correspond to the respective positions in which the rotating plug positioning holes 457A, 457B of the rotating plug 450 are provided. Rear of the positioning pins 468A, 468B of rotating plug are arranged in the holes 437A, 437B of rotating plug pin.

Looking at fig. 8, two 430M marks to confirm the position of the rotating cap 450 in the direction of rotation are formed on the rear surface of the adjustment button 430 at an angular range of 180 °. The adjustment button 430 is rotatably adjusted so that the 430M marks on the adjustment button 430 and the 420M marks on the rear body 420 are aligned, so that the position of the rotating cap 450 in the direction of rotation can be confirmed

Looking at Figs. 8 and 9, the two rotating pin positioning pins 432A, 432B are arranged in the front recess 424 of the base part 422 of the rear body 420, respectively, and the rotating plug positioning pins 432A, 432B are fixed to the projection rear 426 by means of fixing bolts 440A, 440B of pin. The front ends of the positioning pins 468A, 468B of rotating plug are arranged in the positioning holes 457A, 457B of rotating plug, respectively, and the rotating plug 450 is arranged in the front recess 424 of the base part 422 of the body rear 420; the rear shaft portion 454 of the rotating plug 450 is designed to pass through the central hole 420H of the rear body, and the rear ends of the positioning pins 468A, 468B are arranged in the pin holes 437A, 437B of rotating cap, respectively, and the adjusting button 430 is immobilized by screw fastening with respect to the rotating cap 450 by means of a locking screw 430A of adjusting button.

When the 430M marks on the adjustment button 430 are set in a position that corresponds to “CLEAN” from the 420M marks on the rear body 420, the rotary plug positioning pins 432a, 432B are designed to enter the first countersunk hole 461 and in the fourth countersunk hole 464. When the 430M marks of the adjustment button 430 are set in a position corresponding to “1.5” from the 420M marks on the rear body 420, the positioning pins 432A, 432b of the plug They are designed to enter the third countersunk hole 463 and the sixth countersunk hole 466. When the 430M marks on the adjustment button 430 are set in a position that corresponds to “2.0” from the 420M marks on the rear body 420, the positioning pins 432a, 432B of rotating plug are designed to enter the second countersunk hole 462 and the fifth countersunk hole 465.

Looking at Fig. 1, by moving the adjustment button 430 forward, the rotating stopper pins 432A, 432B are able to exit the countersunk holes. In this state, the adjusting button 430 is rotated and the adjusting button 430 is moved back so that the positioning pins 432A, 432B turn into any of the countersunk holes, and the positioning pins 432A, 432B Rotating cap can be positioned.

Looking at Figs. 1, 3, 4 and 9, the base part 422 of the rear body 420 is fastened by screws to the rear end of the gun body 112, using the fixing bolts 192A, 192B of the rear body. By virtue of this configuration, the position of the needle 150 in the axial direction and the position of the front piston 170 in the axial direction can be precisely adjusted to three different positions. That is, with the configuration of the present invention, the adjustment button 430 is rotated so that the position of the needle 150 in the axial direction and the position of the front piston 170 in the axial direction can be adjusted to the same positions, however, many times the position of the needle 150 in the axial direction and the position of the piston 170 in the axial direction are switched, and there is no need for any fine adjustment operation, which was the case with conventional screw-type systems.

Looking at Figs. 1 to 12, a description has been provided in the represented embodiment of a structure

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wherein six countersunk holes 461-466 are formed on the rear side of the base portion 452 of the rotating plug 450 as "non-through holes (blind holes)", but two, or three or more countersunk holes may be provided. When a plurality of countersunk holes has been formed, the respective countersunk holes may be provided in an equidistant manner, taking the central axis of the rotating plug 450 as a reference. In addition, a description has been given in the embodiment shown of a structure in which the countersunk holes 461-466 are formed in the base part 452 of the rotating cap 450, but the countersunk holes may be provided in the rear body, and the rotating stopper positioning pins may be provided in the rotating stopper.

In addition, a description has been provided in the embodiment shown of a structure in which a provision is made for countersunk holes and rotating stopper positioning pins, but it will also be possible to position the rotating plug in the axial direction using recesses already provided. either in the rotating cap or in the rear body, and projections provided in the other, either of the rotating cap or of the rear body. In addition, a description has been provided in the embodiment shown of a structure in which the structural components are connected by screws or bolts, but keys, bayonets or any other well-known method can be used for the fixing method and the ways of fixing Connection.

The needle 150 is designed to meet the front piston 170 and to be able to move in a forward / backward direction along the central axis 114A of the nozzle. When the needle 150 moves backwards, the paint ejection hole 122 may be opened by the front point end of the needle 150. When the needle 150 moves forward, the paint ejection hole 122 may be closed by the front tip end of the needle 150. As described above, when no compressed air is introduced into the front piston opening chamber 176, the front piston 170 moves forward and the needle tip 150C of the needle 150 It is designed to close the paint ejection hole 122, under the elastic force of the needle spring 174.

The total length of the needle 150 can be adjusted to 66 mm, for example, and 10 mm of this can be designed to enter the front piston 170. The diameter of the needle 150 can be adjusted to 4mm, for example. The total length when the needle 150 is fixedly attached to the front piston 170 can be adjusted to 73.5 mm, for example. The tip end of the nozzle 114 and the tip end of the needle 150 must be level.

By adjusting the dimensions in this way, it is possible to adjust the working parts of the stretching in two stages by mounting the nozzle 114 of 28 mm total length with the gun body 112 of 60 mm total length, and using the needle 150 and the piston front 170 total length 73.5 mm.

Looking at figs. 1 to 5, a gun paint passage 320 is provided for the paint passage inside the gun unit 110 and the support unit 210. The gun paint passage 320 includes an outlet section 320A, a section 320B internal body of gun, an internal section 320C of the support unit, and a support input section 320D. The outlet section 320A of the gun paint passage 320 is disposed between the inner wall of the nozzle 114 and the needle 150. The downstream side of the gun paint passage 320 is configured to form a passage with the hole 122 of paint ejection

The paint can be sent from the support inlet section 320D, which is the inlet end of the gun paint passage 320, to the paint ejection hole 122. With this configuration, the needle 150 constitutes a needle valve that is arranged in the gun paint passage 320. This means that the tip end of the needle valve is capable of opening and closing the paint ejection hole 122.

A paint return passage 324 for returning the paint is provided within the gun unit 110. The paint return passage 324 includes a return port section 324A, an internal paint body section 324B, an internal section 324C of the support unit, and a 324D section of support output. The outlet end 324D of the paint return passage and the support outlet section 324D of the gun paint passage 320 are disposed at the rear of the support unit 210.

An atomized air passage 330 for the atomized air passage is provided within the gun unit 110 and the support unit 210. The atomized air passage 330 includes an outlet section 330A, an internal section 330B of the gun body , an internal section 330C of the support unit, and a section 330D of support input. The outlet section 330A of the atomized air passage 330 is disposed outside the outer wall of the nozzle 114. The downstream side of the atomized air passage 330 is configured to form a passage with an orifice 125 of main atomized air. Atomized air can be sent from the support inlet section 330D, which is the inlet end 330 of the atomized air passage, to the main atomized air hole 125. Looking at Fig. 3, the support inlet section 330D of the atomized air passage 330 is arranged at the rear of the support unit 210. In addition, the downstream side of the atomized air passage 330 can be configured to form a passage with an auxiliary orifice 124 of atomized air. This auxiliary passage 124 of atomized air has an auxiliary mission, and it is also possible to employ a structure without this auxiliary atomized air orifice.

A pattern air passage 340 for the pattern air passage is provided within the gun unit 110. The pattern air passage 340 includes an outlet section 340A, an internal section 340B of the gun body, an internal section 340C

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of the support unit, and a 330D section of support input. The outlet section 340A of the pattern air passage 340 is disposed within the inner wall of the retaining ring 128. The downstream side of the pattern air passage 340 is configured to form a passage with the pattern air hole 126. The pattern air may be sent from the inlet section 340D of the pattern air passage 340 to the pattern air hole 126. The inlet end 340D of the pattern air passage 340 is disposed at the rear of the support unit 210.

An air passage 350 that drives the front piston for the operating air passage to expel paint, which causes the needle 150 to move back when the paint is ejected, is provided inside the gun unit 110. The passage of Air 350 that drives the front piston includes an internal section 350B of the gun body, an internal section 350C of the support unit, and a support inlet section 350D. The downstream side of the air passage 350 that drives the front piston is designed to form a passage to the front piston operating in the chamber 176 which is provided on the front of the front end of the front piston 170. The actuating air can be sent from the inlet end of the air passage 350 that drives the front piston to the chamber 176 that drives the front piston. With this configuration, the valve opening and closing device consists of a piston that is actuated by means of air that drives the front piston sent from the chamber 176 that drives the front piston. Looking at Fig. 3, the inlet section 350D of the air passage 350 that drives the front piston is arranged at the rear of the support unit 210.

Furthermore, it is possible to allow the front piston 170 to move in a straight line backwards along the central axis 114A of the nozzle by positioning the needle seal kit 160 as far as possible from the front part. In addition, it is possible to improve the cleaning efficiency by making the color deposit (volume of the flow passage) inside the gun body 112 as small as possible. In addition, it is possible to adjust a narrow space between the nozzle 114 and the needle 150 by providing a narrowed portion at the rear of the nozzle 114, which makes it possible to carry out reliable cleaning and improve cleaning efficiency.

(3) Support unit configuration:

Looking at Figs. 1 to 3, the support unit 210 includes a main support body 212 constituting the base member of the support unit. The internal section 320C of the support unit and the support input section 320D of the gun paint passage 320 are provided in the main support body 212. The support unit 210 is fixed so that it can be separated to the body of gun 112. The support inlet section 320D should consist of a straight thread, and a toric joint (preferably made of perfluoro) that is shaped as a countersunk hole should be disposed within the thread. When the support unit 210 is attached to the gun body 112, the paint and air received by the support unit 210 flow into the gun body 112.

The internal section 350C of the support unit and the support inlet section 350D of the air passage 350 that drives the front piston for the air passage that drives the front piston are provided in the main support body 212. A connection of Air (not shown) that drives the front piston is provided in the inlet section 350D of air passage 350 that drives the front piston. The air connection that drives the front piston is linked to a control panel (not shown) by means of a pipe member such as a tube (not shown), and can also be connected from the control panel to a source of air supply that drives the front piston.

The drive air can be introduced from the inlet section 350D of the air passage 350 that drives the front piston to a spray device 100. When the support unit 210 is fixed to the gun unit 110, the inlet end of The internal section 350B of the gun body of the air passage 350 that drives the front piston is connected to the outlet end of the internal section 350C of the support unit. A toric joint is preferably provided in this connection. A toric joint may be provided in the support unit 210, may be provided in the gun unit 110, or may be provided in both. The input section 350D may consist of a conical thread. An electromagnetic valve (not shown) is provided in the air passage 350 that drives the front piston. When the electromagnetic valve (not shown) is open, air can be discharged that drives the front piston introduced to the chamber 176 that drives the front piston.

The internal section 330C of the support unit and the support input section 330D of the atomized air passage 330 are provided in the main support body 212. An atomized air connection (not shown) is provided in the input section 330D of the atomized air passage 330. The source of atomized air supply and the atomized air connection can be linked using a pipe member such as a connection hose (not shown). Inlet section 330D should consist of a conical thread. The actuating air can be introduced into the spray device 100 from the inlet section 330D of the atomized air passage 330. When the support unit 210 is fixed to the gun unit 110, the inlet end of the internal section 330B of the gun body of the atomized air passage 330 is connected to the outlet end of the internal section 330C of the support unit. A toric joint may preferably be provided in this connection. A toric joint may be provided in the support unit 210, may be provided in the gun unit 110, or may be provided in both.

The internal section 340C of the support unit of the air passage pattern 340 and the section 330D of the support inlet are provided in the main support body 212. An atomized air connection (not shown) is provided in

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the inlet section 340D of the pattern air passage 340. The pattern air supply source and the pattern air connection can be linked using a pipe member such as a connection hose (not shown). The input section 340D should consist of a conical thread. The actuating air can be introduced into the spray device 100 from the inlet section 340D of the pattern air passage 340. When the support unit 210 is fixed to the gun unit 110, the inlet end of the internal section 340B of the gun body of the air passage pattern 340 is connected to the outlet end of the internal section 340C of the support unit. A toric joint is preferably provided in this connection. A toric joint may be provided in the support unit 210, may be provided in the gun unit 110, or may be provided in both.

The internal section 320C of the support unit and the inlet section 320D of the gun paint passage 320 are provided in the main support body 212. A paint inlet joint (not shown) is provided in the section of 320D support inlet of gun paint passage 320. The support entrance section 320D should consist of a conical thread, and a toric joint (preferably made of perfluoro) that is shaped as a countersunk hole should be disposed within the thread. The paint supply source and the paint inlet joint can be linked using a pipe member such as a connection hose (not shown). The paint can be introduced into the spray device 100 from the support inlet section 320D of the gun paint passage 320. When the support unit 210 is attached to the gun unit 110, the inlet end of the gun inner body section 320B of the gun paint passage 320 is connected to the outlet end of the inner section 320C of the gun unit support. A toric joint is preferably provided in this connection. That is, when the support unit 210 is fixed to the gun unit 110, the paint received by the support unit 210 flows through the gun unit 110. A toric seal can be provided in the support unit 210, it can be provided in the gun unit 110, or it can be provided in both.

The internal section 324C of the support unit and the support outlet section 324D of the paint return passage 324 are provided in the main support body 212. A paint return port connection (not shown) is provided in the section 324D of support output of the paint return passage 324. The paint supply source (or the paint reservoir) and the paint return port connection may be linked using a pipe member such as a connection hose (not represented). The paint can be discharged from the support outlet section 324D of the paint return passage 324. The support output section 324D should consist of a straight thread, and a toric joint (preferably made of perfluoro) that is formed as a Countersunk hole should be arranged inside the thread. When the support unit 210 is attached to the gun unit 110, the output end of the gun body internal section 324B of the paint return passage 324 is connected to the input end of the internal section 324C of the paint unit support. A toric joint is preferably provided in this connection. A toric joint may be provided in the support unit 210, may be provided in the gun unit 110, or may be provided in both.

Also, looking at Figs. 6 and 7, in order to respond to a two-stage stretching type spray device of the type of air that will be described later, then during an operation other than that in which the nozzle 114 is being cleaned, it may be provided an air passage 360 that drives the rear piston for the air passage that drives the rear piston that moves the rear piston further forward and keeps it theref The air passage 360 that drives the rear piston includes an internal section 360A of the body internal rear, an internal 360B gun section, an internal 360C section of the support unit, and a 360D support input section. The downstream side of the air passage 360 that drives the rear piston forms a passage in a rear piston end chamber 186 which is provided on the rear of the rear piston main body 180B. The cleaning operation air can be sent from the inlet end of the air passage 360 that drives the rear piston to the rear piston end chamber 186.

The inlet section 360D of the air passage 360 that drives the rear piston is arranged at the rear of the support unit 210. When the rear body is fixed to the gun body 112, the inlet end of the internal section 360A of the rear body of the air passage 350 that drives the front piston is connected to the outer end of the internal section 360B of the gun body. A toric joint is preferably provided in this connection. A toric joint may be provided in the rear body, may be provided in the gun body 112, or may be provided in both.

With the spraying device according to the present invention, each of the above-mentioned gun paint steps 320, the paint return passage 324, the atomized air passage 330, the pattern air passage 340, the passage of air 350 that drives the front piston, and the air passage 360 that drives the rear piston can have an inside diameter that is set to a suitable value in the range of 2 mm to 10 mm. These interior diameters can be adjusted to suitable values by simulation of analysis, experimentation, etc., taking into account the viscosity of the atomized liquid and the state of atomization.

Looking at fig. 3, with the spraying device according to the present invention, the support inlet section 320D of the gun paint passage 320, the support outlet section 324D of the paint return passage 324, the inlet section 330D of Atomized air passage support 330, support inlet section 340D of air passage pattern 340, support inlet section 350D of air passage 350 that drives the front piston, and support inlet section 360D of passage of air 360 that drives the rear piston are preferably provided

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on a surface of the support unit 210, for example a surface that is located at the rear. Looking at fig. 1, the surface that is located on the rear side of the support unit 210 consists of three pianos each at an angle. One or two or three of: the support input section 320D of the gun paint passage 320; of the support output section 324D of the paint return passage 324; of support inlet section 330D of the atomized air passage 330; of the support input section 340D of the air passage pattern 340; of the support inlet section 350D of the air passage 350 that drives the front piston; and of the support inlet section 360D of the air passage 360 that drives the rear piston can be arranged in each of these three planes. This configuration makes it possible to supply paint and air quickly and reliably to the spraying device, and in a stable state. This configuration also means that the tubes for supplying paint and air are easily separated, so that the separation time of the tube can be shortened and the time of maintenance operations can be shortened.

When the spraying device according to the present invention is used for liquids such as water, liquid type adhesives, liquid type oxide formation agents, liquid type insulating agents, liquid type coating agents and drug agents. liquid type, the source of supply for the liquid to be atomized and the paint inlet junction (that is, in such case the joint that is configured as the "liquid inlet junction") can be linked using a member of tubena such as a connection hose (not shown). The spraying device according to the present invention has a unitary structure, and therefore the production process for each structural component can be easily assembled.

The spraying device according to the present invention is configured as a plate-type gun. With this structure, the plate is fixed when the gun is mounted if the gun is fixed for use, if a robot has been made to support the gun, or if the gun is mounted on an alternative motion motor. When the gun is maintained, only the main gun body is separated, and repairs can be carried out, parts can be replaced, or the main body can be replaced. This configuration makes it possible to avoid the problem of being unable to install the gun in its original position during installation after the removal of a tube (hose) that takes place in conventional guns, which makes it possible to shorten the operating time.

A description has been provided in this embodiment and the figures represent a structure in which the gun unit is fixed to the support unit by a bolt with a hexagonal hole, but it is also feasible to use a single-type structure. touch (90 ° of rotation).

(4) Coating operations using the spraying device:

Looking at fig. 1, the spray device 100 can be used in a fixed system, a robot can be made to support an automatic spray gun to use, one or more guns can be mounted on a device known as an "alternative motion motor" to use , or the above structures can be combined for use.

As paint used in spraying device 100, it is possible to use solid paint, or it is possible to use metal paint. Paint containing organic solvents can also be used. Paint containing aluminum powder can also be used. For example, the gun unit 110 of the spraying device 100 is fixed to a robot arm. This fixation can employ a clamping member such as nuts or bolts. Alternatively, the gun unit 110 of the spraying device 100 is fixed to a robot arm, after which the support unit 210 can be fixed to the gun unit 110. In this case, the support unit 210 is fixed to the gun unit 110, after which a connection hose (not shown) may be linked to the support unit 210, or the connection hose is linked to the support unit 210 and then the support unit 210 may be fixed to gun unit 110.

Looking at figs. 1 and 8, when coating operations are carried out, if the 430M marks on the adjustment button 430 are set in a position corresponding to "1.5" from the 420M marks on the rear body 420, the positioning pins 432A, 432B of rotating plug enter the third countersunk hole 463 and the sixth countersunk hole 466. In addition, if the 430M marks on the 430 adjustment button are set in a position corresponding to "2.0" from the 420M marks in the rear body 420, the positioning pins 432A, 432B of rotating plug enter the second countersunk hole 462 and the fifth countersunk hole 465.

The air that drives the front piston is introduced from the air supply source that feeds the front piston into the chamber 176 that drives the front piston, passing through the connection hose and through the air passage 350 that drives the front piston When the air that drives the front piston is introduced into the chamber 176 that drives the front piston, the needle 150 and the front piston 170 meet, and move backward along the central axis 114A of the nozzle in resistance to the elastic force of the needle spring 174, and the cylindrical section that is located at the rear of the front piston shaft 170A moves backward into the inner peripheral part of the cylindrical section that is located on the front of the rotating cap 450 , and the end face at the end of the tip of the cylindrical section that is located at the rear of the front piston shaft 170A is maintained in a state of contact with the passage part within the inner peripheral part of the section cylindrical located on the front of the swivel cap 450. For the air that drives the front piston, it is possible to use compressed air around

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0.25 MPa to 0.35 MPa, for example. The magnitude by which the needle 150 can move backward can be adjusted to 2 mm, for example.

When the needle 150 moves backward, the paint ejection hole 122 opens. The paint is supplied, from the paint supply source by means of the pipe member such as a connection hose, from the gun paint passage 320 to the nozzle 114, and the paint can be ejected from the ejection hole 122 Of paint.

At this point, atomized air is introduced from the atomized air supply source through the connection hose, through the passage of atomized air 330, and passes through the main atomized air hole 125 (and if necessary to through the auxiliary hole 124 of auxiliary atomized air), and atomized air is expelled so that it is possible to atomize the ejected paint from the paint ejection hole 122. The atomized air used can be compressed air at about 0.25 MPa, for example. The atomized state of the paint can be adjusted by changing the atomized air pressure and the number and arrangement of auxiliary orifices 124 of atomized air.

In addition, standard air is introduced at the same time from the standard air supply source through the connecting hose, by means of air passage pattern 340, and the standard air is expelled from the air hole pattern 126, so that an atomized paint pattern can be formed. The standard air can be compressed air at about 0.25 MPa, for example. The shape of the paint pattern can be adjusted by changing the pattern air pressure and the number and arrangement of pattern air holes 126.

The paint that is discharged from the end of the tip of the nozzle 114 is normally atomized by the atomized air in the air cap 120, and the paint is fan-shaped by the pattern air. If the needle 150 is not positioned in the center of the nozzle 114, the state of discharge of the paint that is discharged from the tip end of the nozzle 114 is unstable. In the present invention, as described above, it is possible to allow the front piston 170 to move in a straight line back along the central axis 114A of the nozzle by positioning the needle seal kit 160 as far as it is possible from the front. Also, in the present invention, as will be described below, the main body 180b of the rear piston and a needle plug 180C of the rear piston 180 that is arranged at the rear serve to receive the front piston 170, and the rear piston itself 180 is located reliably on the central axis 114A of the nozzle by means of a rear coupling 172 and a rear body 190, and the front piston 170 can be moved in a straight line backwards along the central axis 114A of the mouthpiece The configuration of the present invention therefore makes it possible to position the needle 150 in the center of the nozzle 114, and move the front piston 180 in a straight line back along the central axis 114A of the nozzle, and therefore It is possible to improve the wear durability of the needle 150 and the sliding components within the needle seal kit 160.

The remaining paint that is not ejected from the paint ejection hole 122 can be returned to the paint supply source (or to the paint reservoir) through the paint return passage 324 and the connection hose. By doing this, it is possible to build a paint circulation line. Alternatively, different types of liquids, including water, adhesives, oxide forming prevention agents, insulating agents, coating agents and drugs can be automatically or manually atomized using the spray device according to the present invention.

When the coating operation is completed, the supply of the air that drives the front piston is stopped, and the needle 150 and the front piston 170 meet and are moved forward by the elastic force of the needle spring 174. When the needle 150 moves forward, the paint ejection hole 122 is closed, and the paint ejection from the paint ejection hole 122 can be stopped. At the same time, the supply of atomized air can be stopped, and the standard air supply can be stopped.

(5) Cleaning the nozzle:

Looking at Figs. 1 and 8, when the nozzle of the spray gun body is cleaned, the 430M marks on the adjustment button 430 are set in a position corresponding to "CLEAN" of the 420M marks on the rear body 420. In this state, the rotating pin positioning pins 432A, 432B enter the first countersunk hole 461 and the fourth countersunk hole 464. When the nozzle of the spray gun body is cleaned, the gun unit 110 of the spray device 100 is removed from the robot arm so that the nozzle 114 can be cleaned. Alternatively, the nozzle 114 can be cleaned with the gun unit 110 of the spray device 100 attached even to the robot arm.

Looking at fig. 13, in a state in which air has been introduced that drives the front piston into the chamber 176 that drives the front piston from the air supply source that drives the front piston, the needle 150 and the front piston 170 meet, and are maintained in a state in which they move backward along the central axis 114A of the nozzle, in resistance to the elastic force of the needle spring 174. At this point, the magnitude at which the needle 150 can move backwards can be adjusted to 3 mm, for example. By virtue of this configuration, the magnitude by which the needle 150 can move backwards from the closed state of the nozzle 114 to the clean state of the nozzle can therefore be adjusted to 5 mm, for example.

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As described above, the degree of opening of the discharge port of the spraying device according to the present invention can be adjusted in a total of three different positions, in particular two coating positions and a cleaning position, and can be achieved. improved performance in terms of significantly reduced cleaning times and significantly improved operating efficiency. Furthermore, with the spraying device according to the present invention, the needle position can be manually adjusted to fully open by the operation of the adjustment button. In addition, with the spraying device according to the present invention, the position of the needle during coating is always a fixed position, which means that there is an effect whereby the quality of the object to be coated (product) It can be kept constant. In addition, the spraying device according to the present invention has a unitary structure that can be separated, and therefore the components that make up each of the units can be easily produced and assembled.

(6) Two-stage air type stretching spray device:

(6-1) Nozzle state closed

A description of the configuration and action will be provided below when a two-stage stretching device of the air type is constructed using the gun unit according to the present invention. Looking at fig. 16, the rear coupling 172 is arranged at the rear of the gun body 112. The needle spring 174 is provided in order to push the main body 170B of the front piston forward. The rear section of the needle spring 174 is arranged so that it comes into contact with the flat section facing the front of the rear coupling 172. The front section of the needle spring 174 is arranged so that it comes into contact with a section. which faces the rear of the front piston flange 170F of the front piston main body 170B. The central axis of the needle spring 174 can be located on the central axis 114A of the nozzle. The front piston 170 is subjected to a force in a direction that moves forward by means of the elastic force of the needle spring 174. Accordingly, when no compressed air is introduced into the chamber 176 that drives the front piston, the piston front 170 moves forward and the needle tip 150C of the needle 150 is designed to close the paint ejection hole 122.

The rear body 190 is fixed to the rear of the gun body 112 by means of the fixing bolts 192. The rear body 190 can be fixed to the gun body 112 using two fixing bolts 192 of the rear body, for example. The rear coupling 172 is disposed within the rear body 190. The rear body 190 is preferably formed of POM (polyoxymethylene), for example.

Looking at fig. 16, the gun unit 110 is provided with the rear piston 180 that can move along the central axis 114A of the nozzle. The rear piston 180 is disposed at the rear of the front piston 170, within the rear body 190. The rear piston 180 includes a rear piston main body 180B and a rear piston shaft part 180G. A rear piston hole 180H is provided within the part of the rear piston shaft part 180G from the front part of the rear piston main body 180B. The needle cap 180C is fixed in the rear piston hole 180H. A toric joint 180D of the rear piston is disposed within a groove in the outer periphery of the main body 180B of the rear piston. The central axis of the rear piston 180 is located on the central axis 114A of the nozzle. The outer peripheral part of the cylindrical section that is located at the rear of the shaft 170A of the front piston is slidably disposed within the inner peripheral part of the cylindrical section that is located on the front of the needle cap 180C. The outer peripheral part of the cylindrical section that is located on the back of the needle cap 180c is fixed inside the inner peripheral part of a hole that is located on the front of the main piston body 180B rear. The flat section facing the front of the main piston body 180B is arranged so that it comes into contact with the flat section facing the rear of the rear coupling 172.

The rear piston end chamber 186 for receiving the air that drives the rear piston that moves the rear piston 180 forward along the central axis 114A of the nozzle is configured within the rear body 190 behind the main rear body 180B . In addition, a chamber 188 that drives the main piston for the introduction of air that drives the main piston that has been received in the rear piston end chamber 186 in order to push the rear wall superfine of the rear piston main body 180B It is configured inside the rear body 190, outside the shaft part behind the main body 180B of the rear piston.

The toric joint 180D of the rear piston is arranged in a groove provided on the outer periphery of the main body 180b of the rear piston. The toric joint 180D of the rear piston is provided in order to hermetically close the main body 180B of the rear piston and the rear body 190. With respect to the toric joint 180D of the rear piston, it is preferable to use a toric joint for the purpose of increasing the slip resistance to receive the front piston 170. The toric joint 180D of the rear piston is preferably formed of perfluoro.

The main piston body 180B can be formed of aluminum alloy A2021 (treatment of aluminum can be carried out, for example). The outer diameter of the front piston 170 is preferably designed to be smaller than the outer diameter of the rear piston 180. Accordingly, the outer diameter of the front piston seal 170C is preferably designed to be smaller than the outer diameter of the joint torica

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180D rear piston.

The needle 150 is designed to meet the front piston 170 and to be able to move in a forward / backward direction along the central axis 114A of the nozzle. When the needle 150 moves backwards, the ink ejection hole 122 may be opened by the end of the front tip of the needle 150. When the needle 150 moves forward, the ink ejection hole 122 may be closed. by the front tip end of the needle 150. In addition, the needle 150, the front piston 170 and the rear piston 180 are designed to meet and to be able to move further back along the central axis 114A of the nozzle from the position in which the needle 150 has moved backward together with the front piston 170.

The total length of the needle 150 may be adjusted to 66 mm, for example, and 10 mm thereof may be intended to enter the front piston 170. The diameter of the needle 150 may be adjusted to 4 mm, for example. The total length when the needle 150 is fixedly attached to the front piston 170 can be adjusted to 73.5 mm, for example. The tip end of the nozzle 114 and the end of the needle seal 150 should be level.

By adjusting the dimensions in this way, it is possible to adjust a stretching of a 2 mm stage, for example, by assembling the nozzle 114 of 28 mm total length with the gun body 112 of 60 mm total length, and using the needle 150 and the front piston 170 of total length of 73.5 mm, and adjusting the rear coupling 172 of 4 mm width, the dimensions of the rear piston 180, and the depth of the needle plug hole 180C within the main body 180B of the piston 26 mm total length posterior. In addition, it is possible to adjust the stretching work parts in two 3 mm steps, for example, by adjusting the dimensions within the rear body 190, the rear coupling 172 of 4 mm width, and the dimensions of the work parts of the piston rear 180.

The inside diameter of the front piston cylinder 170 is 22 mm, for example. The inner diameter of the rear piston cylinder 180 is 24 mm, for example.

An air passage that drives the rear piston (not shown) for the air passage that drives the rear piston that moves the rear piston 180 further forward and holds it there during different operations to those in which the nozzle 114 is being cleaned it is provided inside the rear body 190. The downstream side of the air passage that drives the rear piston is configured to form a passage in the rear piston chamber 186 which is provided in the rear of the main piston body 180B. The cleaning operation air can be sent from the inlet end of the air passage that drives the rear piston to the rear piston end chamber 186.

The inlet section of the air passage that drives the rear piston is arranged behind the support unit 210. When the rear body 190 is fixed to the gun body 112, the inlet end of the internal section of the rear body of the passage of The air that drives the front piston is designed to connect to the outlet end of the internal section of the gun body. A toric joint may preferably be provided in this connection. A toric joint may be provided in the rear body 190, may be provided in the gun body 112, or may be provided in both.

Looking at fig. 16, the rear body 190 has two bolt holes for the passage of the bolts that fix the rear body. The rear body 190 also has six air passage holes 190K forming a passage between the rear piston end chamber 186 and the chamber 188 that drives the rear piston. A plurality of air passage holes 190K are preferably arranged concentrically with the central axis 114A of the nozzle in the center. Six 190K air passage holes have been shown, but there may be four air passage holes, or eight air passage holes, or other number of such holes. The plurality of air passage holes are preferably arranged concentrically such that there is an equal angular interval between them with the central axis 114A of the nozzle in the center. By providing this concentric plurality of air passage holes 190K, the rear piston 180 can move forward reliably and without problems.

The main body 180B of the rear piston and the needle cap 180C of the rear piston 180 which is arranged at the rear serve to receive the front piston 170, and the rear piston 180 itself is reliably located on the central axis 114A of the nozzle by means of the rear coupling 172 and the rear body 190. This configuration makes it possible to move the front piston 170 in a straight line back along the central axis 114A of the nozzle. Furthermore, the configuration of the present invention makes it possible to move the rear piston 180 in a straight line back along the central axis 114A of the nozzle.

(6-2) First open state of the nozzle

Looking at fig. 17, the air that drives the rear piston is introduced from the air supply source that drives the rear piston to the rear piston end chamber 186, passing through the connecting hose, and through the passage of air that actuates the rear piston. The air that drives the rear piston that is introduced into the rear piston end chamber 186 passes through the plurality of air passage holes 190K and flows into the chamber 188 that drives the rear piston from the end chamber 186 of rear piston When the air that drives the rear piston is introduced into the chamber 188 that drives the rear piston, the rear piston 180 moves forward along the central axis 114A of the nozzle, and the flat section facing the front of the

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main body 180B of the rear piston is maintained in a state of contact with the flat section facing the rear of the rear coupling 172. For the air that drives the rear piston, it is possible to use compressed air of about 0.4 MPa at 0.5 MPa, for example.

Air that drives the front piston is introduced from the air supply source that drives the front piston to the chamber 176 that drives the front piston, passing through the connection hose and through the passage of air that drives the front piston 350. When the air that drives the front piston is introduced into the chamber 176 and drives the front piston, the needle 150 and the front piston 170 together, and moves backwards along the central axis ll4A of the nozzle in resistance to the elastic force of the needle spring 174, and the cylindrical section at the rear of the front piston shaft 170A moves backward into the inner peripheral part of the cylindrical section that is located at the front of the stopper needle 180C, and the end face at the end of the tip of the cylindrical section that is located at the rear of the front piston shaft 170A is maintained in a state of contact with the passage part d I enter the inner peripheral part of the cylindrical section that is located on the front of the needle cap 180C.

For the air that drives the front piston, it is possible to use compressed air at about 0.25 MPa to 0.35 MPa, for example. The air pressure that drives the rear piston is adjusted to be higher than the air pressure that drives the front piston. The difference between the pressure that drives the rear piston and the air pressure that drives the front piston can be adjusted to about 0.05 MPa to 0.25 MPa, for example, the magnitude at which the needle 150 can move towards back can be adjusted to 2 mm, for example.

When the needle 150 moves backward, the paint ejection hole 122 opens. The paint is supplied, from the paint supply source by means of the pipe member such as a connection hose, from the gun paint passage 320 to the nozzle 114, and the paint can be ejected from the ejection hole 122 Of paint.

At this point, atomized air is introduced from the atomized air supply source through the connection hose, by means of the atomized air passage 330, and passes through the atomized air hole 125 (and if necessary through from the auxiliary orifice 124 of atomized air), and atomized air is expelled so that it is possible to atomize the ejected paint from the paint ejection hole 122. The atomized air used can be compressed air at about 0.25 MPa, for example. The atomized state of the paint can be adjusted by changing the atomized air pressure and the number and arrangement of the auxiliary orifices 124 of atomized air.

In addition, standard air is introduced at the same time from the standard air supply source through the connecting hose, by means of the standard air passage 340, and the standard air is expelled from the standard air hole 126, so that an atomized paint pattern can be formed. The standard air used can be compressed air at about 0.25 MPa, for example, The shape of the paint pattern can be adjusted by changing the pattern air pressure and the number and arrangement of the pattern air holes 126.

(6-3) Second open nozzle state (nozzle clean state)

A description of the action will then be provided when the nozzle of the spray gun body is cleaned. Looking at fig. 18, in a state in which the air that drives the front piston has been introduced into the chamber 176 that drives the front piston from the air supply source that drives the front piston, an electromagnetic valve (not shown) that is provided in the air passage that drives the rear piston is open, whereby the air that drives the rear piston that has been introduced into the rear piston end chamber 186 and the chamber 188 that drives the rear piston is discharged.

By this, the needle 150, the front piston 170, and the rear piston 180 meet and move backward along the central axis 114A of the nozzle in resistance to the elastic spring of the needle spring 174, and the Flat section facing the rear of the main body 180B of the rear piston is maintained in a state of contact with the passage part within the rear body. At this point, the magnitude by which the needle 150 can move backward can be adjusted to 3 mm, for example. By virtue of this configuration, the magnitude by which the needle 150 can move backward from the closed state of the nozzle 114 to the clean state of the nozzle can therefore be adjusted to 5 mm, for example.

INDUSTRIAL APPLICABILITY

The spraying device described above can be easily realized with any of the three types of conventional spraying devices, in particular devices of the type of adjustment, of the type of two-stage stretching of the air type, and of the multi-stage manual type. That is, it is possible to increase the value of the objects that have to be coated (products) by means of a synergistic effect achieved using three types of spraying device, making it possible to achieve a distinction with standard products. In addition, with a multi-stage manual type spraying device according to the present invention, there is an air circuit less than with a two-stage air type spraying device (the same as with a device of spray of the conventional adjustment type), and therefore there is an advantage when a spray device of the conventional adjustment type is being used, it is possible to replace this with a device of

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Multi-stage manual type spraying according to the present invention without adding an air circuit. In addition, the spraying device according to the present invention has a unitary structure that can be separated, and therefore it is simple to produce and assemble each of the components that constitute the unit.

The spraying device according to the present invention can also be used in a fixed system; It can also be used in a system in which a robot has been made to support an automatic spray gun; it can be used in a system in which one or more automatic spray guns are mounted on a device known as an "alternative motion motor"; or it can be used in a system that combines the previous configurations. The spray device according to the present invention makes it possible to shorten the idle time when the spray gun body is cleaned, when the spray gun body is replaced, or when the nozzle is replaced, and the paint can be sprayed. with only a short amount of time lost. In addition, the spraying device according to the present invention makes it possible to shorten the downtime for coating operations when the nozzle is cleaned. In addition, the spraying device according to the present invention makes it possible to spray not only paint but also different types of liquids, including water, adhesives, oxide formation prevention agents, insulating agents, coating agents and drugs. The structural components of the spraying device according to the present invention can be easily produced and assembled, and therefore the device can be produced using a simple process.

LEGENDS OF SYMBOLS

100 spray device

110 gun unit

112 gun body

114 nozzle

150 needle

160 needle seal kit

170 front piston

174 needle spring

176 chamber that drives the front piston

180 rear piston

186 rear piston end chamber

188 chamber that drives the rear piston

190 back body

210 support unit

220 bolt with hexagonal hole

400 spraying device

420 back body

430 adjustment button

450 rotating cap

Claims (3)

5 10 fifteen twenty 25 30 35 1. A spray device (100) for spraying paint from a paint ejection hole (122) which is provided with: a nozzle (114) having a paint ejection hole (122) for atomizing and expelling paint; a needle (150) to open and close the paint ejection hole (122); a front piston (170) that is fixed to the needle (150); a needle spring (174) which is provided so as to push the front piston (170) towards the paint ejection hole (122); a gun body (112) that accommodates the nozzle (114) and accommodates the front piston (170); a rear body (190) that is disposed on the rear of the gun body (112); a needle position adjustment mechanism for adjusting the position of the needle (150) in a direction along the central axis of the nozzle (114), and a support unit (210) that is fixed so that it can be separated to the gun body (112); when the support unit (210) is fixed to the gun body (112), the paint and air contained in the support unit (210) flow through the gun body (112); characterized in that the needle position adjustment mechanism includes an adjustment member that is rotatable with the central axis of the nozzle (114) in the center, and a rotation position adjustment member to adjust the position of the piston front (170) along the central axis of the nozzle (114) corresponding to the angle of rotation of the adjusting member, and The needle position adjustment mechanism is configured such that when the front piston (170) moves along with the needle (150) along the central axis of the nozzle (114) in a direction away from the hole ( 122) paint ejection in a state in which the amount of paint discharge leaving the paint ejection hole (122) has been adjusted, the front piston (170) and the needle (150) meet and the needle moves away from the paint ejection hole (122) to open the hole. 2. The spraying device (100) according to claim 1, wherein the needle position adjustment mechanism includes an adjustment button (470) that is rotatable with the central axis of the nozzle (114) in the center, and a rotating plug (450) to adjust the position of the front piston (170) along the central axis of the nozzle (114) in correspondence with the rotation angle of the adjusting member, and the outer peripheral part of the cylindrical section of the front piston (176) is slidably disposed within the inner peripheral part of the cylindrical section of the rotating plug (450). 3. The spraying device (100) according to claim 2, wherein a plurality of countersunk holes (461, 462, 463) are formed in the rotating plug (450), and a positioning pin (432A) of the rotating plug It is provided on the rear body; and the positioning pin (432A) of the rotating plug can be positioned in the countersunk holes (461, 462, 463) by moving the adjustment button (430) in the direction along the central axis of the nozzle (114) and causing the rotation of the adjustment button (430).