JPS634525Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention includes a spray gun provided with a deflection outlet and a controller capable of controlling the airflow from the deflection outlet according to the shape of the surface to be painted. The present invention relates to a coating device that can easily and reliably and efficiently apply a coating material not only to the inner peripheral surface of a small blind hollow body but also to the back surface of the wall where the inlet is provided.

As a spray gun that deflects the paint flow discharged from an air cap part by an air flow, for example, the spray gun disclosed in Japanese Utility Model Publication No. 35-678, ``A spray gun for painting the inner surfaces of small diameter objects or hollow objects with small inlets,'' is an example. known as "nozzle". However, as shown schematically in Fig. 5, in this case, the deflection air hole a is formed so as to intersect the axial direction of the air cap part b diagonally forward, so the paint flow P still only moves forward. As a result, when the object W to be coated is, for example, a cannonball, and it is necessary to paint the back surface e of the wall d in which the insertion inlet c of the spray gun s is provided, the spray gun cannot be used to paint the back surface e. This required additional work such as brush painting.

The present invention is equipped with a spray gun with a deflection outlet opening diagonally backward, and a controller that controls the air flow from the deflection outlet, and can spray the back surface as well as the inner surface and tip surface at the same time. The purpose of the present invention is to provide a coating device that enables continuous and efficient coating, and one embodiment thereof will be described below with reference to the drawings.

In the figure, the coating device 1 of the present invention includes a spray gun 3 having a deflection outlet 2, and a controller 4 for controlling the air flow from the deflection outlet 2, and the spray gun 3 is remote-controlled in this embodiment. It is configured as a so-called automatic gun that can turn on and off the blowing of paint and air by operation, and has a rectangular parallelepiped gun body 5 with a long neck 6 protruding from the tip, and the deflection blow-off port 2 is connected to the neck 6. It is formed at the tip of the auxiliary pipe 7 attached along the line. The neck 6 is the gun body 5
An inner tube 8 is fitted to the tip of the gun via a tapered metal fitting 10, and an outer tube 9 is attached to the gun body 5 through a joint fitting 11 coaxially with the inner tube 8. It passes through an inner hole 12 and a side hole 13 provided in the main body 5 and communicates with a paint nipple 14 on the side of the gun main body 5. Also, the air flow path between the outer tube 9 and the inner tube 8 is connected to the gun body 5.
Two air nipples 15, 1 arranged in parallel on the lower surface of
One of the air nipples 15 of 6 is communicated with through a guide hole 17, and the other air nipple 16 communicates with a cylinder 20 provided at the rear of the gun body through a guide hole 19. A piston 21 is airtightly housed in the cylinder 20 so as to be able to slide back and forth.
A rear extension of a needle valve 24 that passes through the inner tube 8 and is sealed with a seal 23 at the center of the gun body 5 is screwed. The piston 21 is attached to a spring 26 inserted between it and a rear cap 25 that is screwed onto the rear part of the gun body 5.
is urged forward by. A paint nozzle portion 27 is fitted at the tip of the inner tube 8, and an air cap portion 29 is screwed into the outer tube 9. The paint nozzle portion 27 has a valve seat 32 at the tip of a hole portion 30 into which the needle valve 24 is loosely inserted, and which is capable of coming into and out of contact with the needle valve 24 and has a paint discharge port 31 transparent in the center. 2
The outer tube 9 is held concentrically by a flange portion 34 provided with a notched groove on the outer periphery of the tube 7. air cap 29
Forms a stepped portion 36 that can be brought into close contact with the outer periphery of the flange portion 34 and presses the inner tube 8 through the paint nozzle portion 27, and also surrounds the end of the paint nozzle portion 27 at its tip and prevents paint from being discharged around it. It has a through hole forming an air outlet 37 coaxial with the outlet 31. The auxiliary pipe 7 is connected to the neck part 6 by a suitable stopper 39, and a joint 40 is attached to the proximal end, and the deflection outlet 2 formed at the distal end is connected to the air flow A to be discharged. is opened diagonally rearward so as to refract the paint flow P ejected from the paint discharge port 31 diagonally rearward. Furthermore, the protruding position and mounting angle of the deflection outlet 2 are set so that the deflection outlet 2 does not come into contact with the paint flow P when the paint flow P travels straight and prevents the refracted paint flow P from colliding with the air cap portion 29. In addition, in order to efficiently bend the paint flow P which spreads in a rotary shape due to spraying,
As shown in FIG. 4, it is formed in the shape of a long hole that is long and widens toward the end in a direction perpendicular to the paint flow P. The deflection outlet 2 may be formed by juxtaposing circular holes, or may be configured such that its diameter gradually decreases toward the external position. Controller 4
In this embodiment, the flow control valve V is made up of a flow control valve V and a template 41, and the flow control valve V is variable so as to increase the amount of passing air, for example, by increasing the amount of depression of the roller 42, which can move forward and backward. The flow control valve V is formed as a control valve or a flow control valve, and the flow control valve V is
It is attached to a movable table 43 that can move forward and backward toward the object W to be coated and has the spray gun 3 fixed thereon. Further, the template 41 faces the flow rate control valve V and is connected to the movable table 43.
Sliding surfaces 41a, 41b, 41 are placed stationary in the advancing and retreating direction of the object W and are bent to follow the inner surface shape of the object W
It is equipped with a gauge part consisting of c. Therefore, the flow rate regulating valve V can track and detect the gauge portion of the template 41 with the roller 42 as the moving table 43 moves, and can adjust the amount of air based on the detection. For example, the object W to be coated is a bullet-shaped blind cylinder shown in FIG.
When painting the inner surface of the wall, the rising height is made large so that the paint flow P can be bent diagonally backward in order to spray the painted surface P1 consisting of the back surface e of the wall d where the entrance c is provided. The sliding surface 41b is slightly low enough to bend the paint flow P at a substantially right angle in order to spray the painted surface P2, which is the inner surface k of the straight cylindrical portion j, and the sliding surface 41b is slightly lower than the tapered curved surface n of the tip portion m. It is formed on a slope that gradually becomes lower in order to apply the coating to the coating surface P3 consisting of Furthermore, the sliding contact surfaces 41a to 41 are provided with a notch 41d that can close the flow rate control valve V to make the paint flow P go straight in order to spray the painted surface P4 at the tip.
d is the center line X ₁ facing forward from the paint discharge port 31
As the angle Y between _the line and the orthogonal line Flow P at a large angle, preferably approximately,
It is set so that it can be bent approximately to the opening angle Y. The paint nipple 14 is connected to the paint tank 45,
The air nipples 15 and 16 are connected to a high-pressure air source 47 via a timed operation panel 46 equipped with an on-off valve, etc., to allow spraying while preventing spitting, etc., and the auxiliary pipe 7 is connected to the Connected to flow control valve V.

However, in the coating apparatus 1 of the present invention, when spraying the object W to be coated, which is a rotating blind hollow body having a relatively small inlet c, for example, the movable table 42 is operated to supply the air cap portion 29 from the inlet c. Insert the template 41 and blow air through the air outlet 37 through the air nipple 15 and the guide hole 17 using the time control panel 46.
The roller 42 of the flow control valve V comes into contact with the point a, and by pushing up the roller 42, a strong air flow A is ejected from the deflection outlet 2. Also air nipple 1
6. By supplying air to the cylinder 20 through the guide hole 19, the piston 21 and therefore the needle valve 24 are moved back against the spring 26, and the paint discharge port 31 is opened;
As a result, the paint is atomized by the air from the air outlet 37, and the paint flow P ejected from the paint outlet 21 is refracted in the backward diagonal direction by the air flow A from the deflection outlet 2, as described above. , therefore, the back surface e of the wall d provided with the entrance c, that is, the painted surface P1
can also be sprayed, and the air cap part 29
The roller 42 contacts the sliding surface 41b and bends the paint flow P at right angles to the inner surface k of the object W to be coated.
That is, the painting surface P2 can be painted. Similarly, the sliding surface 41
Control the coating surface P3 of the inner circumferential surface n of the tip by c, and control the bending angle of the coating surface P4 of the tip by the notch 41d from 0 to a rearward angle.
Can be applied uniformly and continuously to the inner surface of

As described above, the spray gun of the present invention includes a spray gun having a deflection outlet that refracts the paint flow ejected from the paint outlet obliquely backward, and a controller that adjusts the airflow ejected from the deflection outlet. As a result, the air flow from the deflection outlet can be strengthened by increasing the angle between the center line directed forward from the paint outlet and the orthogonal line perpendicular to the painted surface, thereby increasing the air flow from the deflection outlet. It is now possible to spray the back side of a wall of a hollow body with a small-diameter inlet by bending the paint flow diagonally, compared to the conventional painting method using a small bent brush, etc. The work efficiency can be greatly improved compared to the previous one, and by using a controller to adjust and feed the airflow from the deflection outlet, the angle range can be adjusted freely from diagonally backward to straight forward. This allows the paint flow to be bent and sprayed over a wide area.
In addition, the strength of the air flow can be adjusted by changing its flow rate or pressure.

In addition to the case where the spray gun uses an auxiliary pipe to form a deflection outlet as in the above embodiment, the neck can be made of a triple pipe, or the deflection outlet can be formed in a fitting attached to the tip of the spray gun. . In addition to the controller that can change the air amount steplessly, it is also possible to use a controller that can change the opening angle stepwise for each predetermined angle range, and a controller that uses the flow rate control valve and template. In addition, as long as the strength of the air flow, such as the pressure and flow rate, can be varied according to the opening angle of the object to be coated, the inner surface shape can be directly detected, and the inner surface shape can be converted and displayed as appropriate. Various methods are available, including indirect detection using a cam, detection of the relative distance between the spray gun and the object to be coated, and detection based on time control based on the speed of movement of a moving platform, etc. formats can be adopted.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the present invention along with its operation, Fig. 2 is a sectional view illustrating a spray gun,
FIG. 3 is a sectional view taken along the line A-A, FIG. 4 is a perspective view illustrating a deflection outlet, and FIG. 5 is a sectional view illustrating the tip of a conventional spray gun. 2... Deflection outlet, 3... Spray gun, 4
...Controller, 27...Paint nozzle section, 29...Air cap section, 31...Paint discharge port, 37...Air outlet, 41...Template, 43...Movement table, P...Paint flow, P1-P4...Painted surface, V
...flow control valve, W ... object to be coated, X ₁ ... center line,
X ₂ ...orthogonal line, Y...angle between them.

Claims (1)

[Scope of utility model registration request] A spray gun, which is provided with a deflection outlet that opens diagonally backward in front of the paint discharge port and can blow out an air flow that intersects with the flow of paint discharged from the paint discharge port, can be moved forward and backward toward the object to be coated. a template that is placed on a movable base and has a gauge part that is placed stationary and has a shape that follows the shape of the painted surface of the object to be painted; and a template that is attached to the movable base and that moves the gauge part as the movable base moves; By tracking and detecting, the airflow ejected from the deflection outlet increases as the angle between the center line of the spray gun moving forward from the paint outlet and the orthogonal line perpendicular to the painted surface of the object increases. A coating device comprising a controller having a flow rate regulating valve that can be increased.