JPS5884070A - Electrostatic airless spray painting gun - Google Patents

Abstract

PURPOSE:To perform stable electrostatic painting by permitting easy and sure setting of the electrode direction of a nozzle tip base in either of two vertical or longitudinal directions where an electrostatic effect is good. CONSTITUTION:In the state of mounting a tip base 18 fitted with a nozzle tip 17 for electrostatic painting to the preceding end surface in the barrel part 2 of an electrostatic airless spray painting gun 1, two recesses 20, 20' which are deviated in angle by 90 deg. with respect to the center of a nozzle are formed on the rear surface of the base 18, and a projecting part 21 projecting and formed on the preceding end surface of the part 2 is fitted at a suitable angle in said recesses 20, 20'. Since the nozzle port is positioned so as to be set either horizontally or vertically by the recesses 20, 20' on the rear surface of the base 18, the adjustment for the direction of the base 18 in the stage of spraying like in the prior art is eliminated and the nozzle port is determined precisely in the positions of the horizontal or vertical spray patterns. The electrode direction of the base 18 is easily set always in either of the two vertical or horizontal directions where an electrostatic effect is good.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic airless gun. The direction of the nozzle tip can always be fixed at a position with good electrostatic effect.
In addition, adjustment of the direction of the pattern is not required.

Conventional. After tightening the tip base cover to attach the nozzle tip to the electrostatic airless gun. In order to make the direction of the fan-shaped pattern sprayed horizontally or vertically, it is necessary to adjust the direction of the nozzle tip stand, which is fixed by the cover, by rotating it with a monkey key or wrench. Do. It is complicated to align the chip stand in a horizontal or straight position.

or. An electrode is fixed to the front of the nozzle tip holder, and a grounding member located at the rear across the insulating gun barrel acts as a counter electrode, so it is not possible to change the orientation of the nozzle tip holder.

This also changes the conditions for optimal electrostatic effect between the tip electrode and the counter electrode, and depending on the orientation of the nozzle tip stand (position of the electrode), the electrostatic effect can be reduced.

In view of the above-mentioned circumstances, the present invention makes it possible to fix the orientation of the nozzle tip from the beginning with the horizontal pattern at the base of the vertical pattern, eliminating the need for adjustment. The aim is to provide an electrostatic airless gun that can be set and provide a stable electrostatic effect.
It is something to do.

The configuration of the present invention will be described below with reference to two illustrated embodiments.

1 is an electrostatic airless gun consisting of a barrel part 2 made of an insulating material, a conductive handle part 8, and a tip atomizing part 4 provided at the tip of the barrel part 2, and the barrel part 2 has a paint passage 5 in the L part. Running vertically,
A needle valve 6 is provided to be able to move forward and backward by operating a trigger 7, and a high resistance element 8 is cast into the tip of the lower VCI/i of the barrel portion 2, and a high voltage cable insertion hole 9 is formed at the other end of an insulating material. An L-shaped casing 10 made of A.

Furthermore, the handle portion 3 is made of a conductive material.

The upper part of the handle part 8 is fixed to the gun barrel part 2, and the lower part of the handle part 8 is an L-shaped casing 1 fitted into the gun barrel part 2.
A high voltage cable 12 enclosing the other side of the high voltage cable 12 is inserted into the high voltage cable insertion hole 9. Reference numeral 18 denotes a metal paint pipe, the base end of which is fixed to the handle part 3, and the tip of which passes in front of the trigger 7, passes from below the gun barrel part 2 to the side of the gun barrel part 2, and is installed on the side of the handle part 8 fC. connected to the paint introduction part 14,
The paint passes through the sleeve 15 from the introduction part 14 to the paint passage 5.
sent to the side.

Further, the tip atomizing section 4 provided at the tip of the gun barrel section 2 has a nozzle tip stand 18 fitted with a nozzle tip 17 having a nozzle opening 16 in the center thereof, which is attached to the gun barrel section 2 by a cover 19. As shown in FIG. 2 and FIG. 1g8, the base 18 has two recesses 20, 20 formed on the rear surface 18a with an angle difference of 90 degrees with respect to the center, and on the front and shoulder surfaces of the opposing gun barrels 2. One of them is fitted into the protruding convex portion 21 and attached to the gun barrel portion 2. In this case, the nozzle opening 16 and the nozzle tip 21 are positioned in either of the recesses 20.20 on the rear surface 18a so that the pattern to be sprayed is either horizontally or vertically, and the nozzle/L tip 18 is positioned in six directions.
is mated to. 22 indicates a nozzle tip holder. A charging electrode 2B with a tip is protrudingly provided on the nozzle tip stand 18 at a position slightly in front of the nozzle tip 17 and slightly away from the paint jetting axis, and a charging electrode 2B with a tip is protruded from the charging electrode 28 across the paint jetting axis. The power receiving section 24 and the power receiving section ? A floating electrode 26 having an electric field electrode 25 extending forwardly from the floating electrode 4 is provided.

Next, to explain the present invention in detail, first, a nozzle tip stand 18 fitted with a nozzle tip 17 is attached to the distal end surface 2a of the gun barrel 2.
6 is fitted into the nozzle tip stand 18 in such a direction that the pattern to be sprayed onto either of the recesses 20, 20 on the rear surface 18a of the nozzle tip stand is positioned either horizontally or vertically. Here, in either of the two recesses 20, 20 having an angular difference of 9o0 with respect to the center bored in the rear surface 18a of the nozzle tip stand 18H, a convex that serves as a guide protruding from the distal end surface 2a of the gun barrel portion 2 is provided. The portion 21 is fitted.

Furthermore, the cover 19 is screwed and tightened to be fixed to the gun barrel portion 2. In this state, when the handle portion 8 is gripped and the trigger 7 is pulled, the needle valve 6 is moved back and the pressurized paint is sprayed from the nozzle port 16 communicating with the paint passage 5. The pattern sprayed from the nozzle orifice 16 is M-shaped because the nozzle orifice 16 is previously positioned and fitted to the nozzle tip base 18 so as to form either a straight horizontal pattern or a straight vertical pattern as described above. When sprayed in either a horizontal pattern or a fan-shaped straight vertical pattern, along with the paint spray,
High voltage is applied to the gun barrel 2. When the electricity passes through the electrical path 11 in the L-shaped casing 1G contained in the handle part 8 and is supplied to the charging electrode 28 of the pre-mN converting part 4, the electricity is transferred from the charging electrode part to the power receiving part 24 of the floating electrode 26 facing oppositely. , an electric field electrode 25 which discharges electricity across the paint film sprayed from the nozzle opening 16 to charge the paint particles, and further extends forward from the power receiving part 24.
A stable electric field is formed between the object to be coated and the metal paint pipe 13 serving as the counter electrode, thereby stabilizing the electrostatic effect.

The counter electrode in the gun to which the present invention is applied corresponds to the paint pipe 18, which is the grounding member closest to the electric field electrode 5 of the floating electrode 26 at the tip of the gun, so that the floating electrode 26 is on a hill with respect to the tip table. If it is located downward, as shown in Fig. 4A, part A of the paint pipe 18 located below the gun barrel 2 and in front of the trigger 7 corresponds, and if it is located in the left-right direction, As shown in the opening in FIG. 4, part B of the paint pipe 18 which bends from the gun barrel part 2 to the first surface of the nozzle part 8 corresponds to the part B of the paint pipe 18. However, as described above, the shape of the paint pipe 18 that becomes the counter electrode is located on the lower surface of the gun barrel and in front of the trigger 7, passes along the side of the gun barrel 2, and passes through the rear part 7 and the trigger 7. 8, it is clear that an effective electrostatic effect (throwing property) can be obtained when the floating electrode 26 is set closer to this opposing electrode side. That is, the electric field electrode 25 When the floating electrode 26 is set on the lower side or the left side when viewed from the front of the gun, the charges charged on the opposing floating electrode 26 from the charged electrode blade at the tip easily flow to the opposing electrode. When a discharge occurs, the discharged charge is transferred to the charged electrode 2.
8, the floating electrode 26 is charged, and a discharge occurs across the paint film sprayed from the nozzle port 16. When a charged electrode is set downward or close to an oblique electrode, there is a tendency for discharge to occur directly from the charged electrode to the opposite electrode, and discharge across the sprayed paint film is suppressed. It is clear that the electrostatic effect tends to decrease. The graph shows the relationship between the orientation of the chip stand (the position of the floating electrode) and the electrostatic effect yield value based on an experiment conducted by the inventor.

1, the present invention is used to attach a tip holder fitted with a nozzle tip to the distal end surface of a gun barrel.

Two recesses are formed on the rear surface of the tip table at an angle of 9♂ with respect to the center, and a protrusion formed on the tip surface of the gun barrel is fitted into the recesses, so that the nozzle opening is located on the rear surface of the nozzle tip table. Since the spray pattern is positioned either horizontally or vertically with respect to one of the recesses and is fitted to the chip stand, there is no need to adjust the orientation of the chip stand during spraying as in conventional methods. Therefore, the position of the horizontal or vertical spray pattern is properly determined.

Furthermore, a charging electrode to which a high voltage is applied and a floating electrode provided opposite to the electrode are fixed to the front surface of the chip stand.
fc is provided to separate the floating electrode from the gun barrel made of an insulating material.
Since the frontmost part of the counter electrode made of a material tube is maintained at a shorter distance, the chip stand can be tilted at a 90° angle.
A stable electrostatic effect can be maintained even when fixed at one of two positions with an angular difference of .

That is, with the configuration of the present invention, the electrode direction of the nozzle tip stand is necessarily set in either the vertical or horizontal direction, which provides a good electrostatic effect.

It is possible to achieve the above-mentioned purpose.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a vertical side view, FIG. 2 is a sectional view of the nozzle tip base, FIG. FIG. l...... Electrostatic airless gun 2...
・・・・Barrel part 2a ・・・・・・・・・ Tip surface 18
......Paint pipe 17...
Nozzle tip 18...Nozzle tip stand t
Sa・・・・・・Rear side 20.20・・・・・・
...Concave portion 21...Convex portion 28...
...Charged electrode 26...Floating electrode patent applicant Iwata Painting Machine Co., Ltd. Figure 1, Figure 211I

Claims (1)

[Claims] 1. A nozzle tip stand provided with an electrode fixed at the center of the tip and eccentric from the center of the six spray nozzles, and an insulating gun barrel separating the electrode and a counter electrode, In an electrostatic airless gun having a grounding member whose frontmost part is located at an asymmetric position with respect to the center of the nozzle, the electrode is connected to the grounding member so that the frontmost part of the grounding member maintains a shorter distance and has an angular difference of 9♂-. An electrostatic airless gun characterized by being configured to be fixed in only two positions. 2. The nozzle tip stand with fixed poles has two recesses bored on the rear surface with an angle difference of 90' from the center, and a convex part that fits into either of the two recesses. The electrostatic airless gun described in Patent No. 1, characterized in that the repellent gun is fitted onto the tip end surface of the gun barrel.