JPS6314918Y2 - - Google Patents

Description

[Detailed description of the invention] The invention provides an automatic spray gun with a driven part that communicates with an externally operable actuator and hydraulic pressure, thereby making it possible to remotely adjust the amount of paint discharged from the automatic spray gun. The present invention relates to an automatic spray gun device that can be suitably employed in painting robots and the like.

BACKGROUND ART Automatic spray guns equipped with a pattern adjustment mechanism that enable remote control of the spray pattern from round spray to flat spray, etc. are known. However, even with an automatic spray gun, in order to control the amount of paint ejected, conventionally, as shown in FIG. 5, for example, as shown in FIG. Therefore, even with an automatic spray gun, the amount of paint ejected must be manually adjusted, resulting in poor operability.

The present invention solves the above problems by making it possible to adjust the spray paint flow using an externally operable actuator, and also provides fluid communication between the actuator and the automatic spray gun. Therefore, with the aim of providing an automatic spray gun device that can also ensure operational safety, an embodiment thereof will be described below with reference to the drawings.

In the figure, an automatic spray gun device (hereinafter referred to as the device) 1 of the present invention has a driven part 5 provided with an operating piston 4 that can come into contact with a needle valve 3, for example at the rear end of an automatic spray gun 2. The part 5 is connected to an externally operable actuator 6,
The automatic spray gun 2 is attached to the end of the arm of a robot R, for example, and a paint nozzle 10 is connected to the tip of the gun body 7 through a cylinder 9 that is screwed into the tip.
At the same time, the needle valve 3 moves toward and away from the inner surface of the paint nozzle port 12 that opens at the end of the paint nozzle 10, thereby opening and closing the paint nozzle port 12. Further, since the needle valve 3 has a tapered end, the opening area of the paint nozzle opening 12, that is, the opening margin can be increased as the amount of retraction thereof increases. The paint nozzle opening 12 passes through the inner hole 13 of the paint nozzle 10 and the hole 15 of the cylinder body 9 to a paint nipple 16 provided below at the tip of the gun body 7. A head fitting 19 is attached to the gun body 7 with a gap 17 between it and the tip of the cylinder 9, and the head fitting 19 and the outer flange 10 of the paint nozzle 10 are connected to each other.
A is attached to a buff-full plate 22 which abuts on the outer flange portion 10a via a gasket 21.
An air cap 23 is also inserted into the paint nozzle 10. The air cap 23 is attached to the head fitting 19.
The inner flange 25 of the cap nut 24 comes into contact with the front surface of the outer flange portion 10a,
Furthermore, the air outlet 27 of the air cap 23, which is bored around the paint nozzle port 12, is connected to the inner flange 25.
and the paint nozzle 10, the through hole 26 of the outer flange portion 10a, the head fitting 19 and the paint nozzle 10, the air path A formed by the space 17 and the passage 30.
Through this, it communicates with a hole 34 for mounting the pattern control valve set 31. The air cap 23 also has a pattern adjustment hole 32 in one of its parts, and the pattern adjustment hole 32 passes through the through hole 33 of the head fitting 19 inside the cap nut 24 and into the taper valve 35 of the pattern adjustment valve set 31. It communicates with the hole 34 through a valve seat whose opening area is controlled by. The needle valve 3 has a cylinder 37 opened at the rear of the gun body 7.
When the piston 39 sliding in the cylinder 37 retreats, the piston 39
The abutment fitting 40 pressed by 9 is screwed. The taper part 39a at the tip of the piston 39 can open and close the guide hole 43 of the valve cylinder 42, and by opening and closing the piston 39, an air nipple 45 attached to the gun body 2 for sucking the blown air and an air nipple 45 of the valve cylinder 42 are opened and closed. An air path B for blown air formed by the inner hole 46 and the guide hole 43 communicating with the hole portion 32 is turned on and off. On the front surface of the cylinder 37, there is an air nipple 49 for intake of air for operating the piston 39, which is juxtaposed to the air nipple 45.
A guide hole 50 is opened. In the figure, 51a,
51b is a spring that presses the piston 39 and the fitting 40 forward.

The driven part 5 has a cylinder chamber 53 opened at the rear end of a base body 52 that can be screwed into the rear end of the cylinder 37, while the cylinder chamber 53 is hidden by a rear bracket 54. A driven piston 4 is housed in the cylinder chamber 53 so as to be slidable toward the needle valve 3. In this embodiment, the driven piston 4 is provided with an adjustment rod 55 on its front surface that passes through the base 52 in an airtight manner.
An indicator rod 57 of the same diameter protruding from the rear bracket 54 is screwed into the rear surface of the rod, and a front port 60 and a rear port 61 are connected to the cylinder chamber 53 before and after the rod.

The actuating tool 6 is provided separately from the automatic spray gun 2 and has a cylinder chamber 64 opened in the base 63, and the cylinder chamber 64 is hidden by a front bracket 68. The actuating piston 65 slides. The actuating piston 65 has a piston rod 66 protruding from the outside, so that the actuating piston 65 can be externally operated via the piston rod 66. Further, the operating piston 65 is provided with an indicator rod 67 of the same diameter for compensation, and in this embodiment, the piston rod 66 is connected with a nut fitting 71 that is screwed onto a threaded shaft 70 rotated by, for example, a pulse motor 69. By appropriately locking the nut fitting 71, the piston rod 6 is rotated by the rotation of the pulse motor 69.
6 can move forward and backward, while the front port 73 and the rear port 74 before and after the cylinder chamber 64 are connected to the driven part 5.
The cylinder chambers 53, 64 and the hoses are connected to the front port 60 and the rear port 61 through hoses, respectively, and the cylinder chambers 53, 64 and the hoses are filled with liquid.

However, in the device 1 of the present invention, by introducing high-pressure air from the air nipple 49 into the front end of the cylinder 37, the piston 39 is retracted, and the high-pressure air introduced from the air nipple 45 is passed through the inner hole 46 of the valve cylinder 42 and the piston 39. The air passage B passes through the hole 43 and is guided to the hole portion 34 . The high-pressure air in the hole 34 flows between the passage 30 and the
At the same time, the air is blown out from the air outlet 27 through the 17th air passage A, and at the same time, the pattern control valve set 31
The air metered by is ejected from the pattern adjustment hole 32 through the through hole 33 and the inside of the cap nut 24.

Further, the piston 39 comes into contact with the abutment fitting 40 by retreating, and the corresponding fitting 40 is moved back until the rear end of the needle valve 3 comes into contact with the adjustment rod 55. As a result, the opening range of the paint nozzle port 12 is determined according to the amount of retraction of the needle valve 3, and an amount of paint corresponding to the opening range can be ejected. Furthermore, when the pulse motor 69 is operated to move the working piston 65 forward, for example, via the piston rod 66, liquid corresponding to the amount of movement of the working piston 65 flows from the front port 73 into the front port 60 of the driven part 5. As a result, the driven piston 4 is moved backward and the amount of retraction of the needle valve 3 is increased, thereby increasing the opening margin of the paint nozzle port 12 and increasing the amount of paint to be ejected. Similarly, by rotating the pulse motor 69 in the reverse direction, the opening margin can be reduced and the amount of paint ejected can be reduced. The cylinder chamber 64 of the actuator 6 is formed to have a smaller diameter than the cylinder chamber 53, and the stroke of the actuator piston 65 is increased to reduce the actuation force of the actuator piston 65 of the actuator 6. It can also be formed. Further, depending on the amount of protrusion of the indicator rod 57 of the driven portion 5, the opening margin of the needle valve 3 can be visually observed from the outside.

FIG. 4 shows another embodiment of the present invention, in which the actuating tool 6
The piston rod 66 of the piston rod 66 is made to protrude outside, and the roller at the tip thereof is brought into contact with the template 75 that moves back and forth with the object to be coated, while the cylinder chamber 6
4 is provided with a spring 76 for biasing the actuating piston 65 toward the template 75, and then the port 7
4 and the rear port 61 of the driven part 5 are communicated with each other.

As a result, the piston rod 66 moves up and down following the shape of the template 75 as it moves back and forth, injects liquid from the rear port 74 into the rear port 61 of the driven part 5 according to the amount of movement, and moves the driven piston 4 back and forth. The opening margin of the paint nozzle opening 12 can be adjusted using the adjusting rod 55. Note that when the driven piston 4 is pressed by the needle valve 3 during operation of the automatic spray gun 2 as in the embodiment described above, the return fluid circulation hose connecting the front ports 60 and 73 may be omitted.

As described above, the device of the present invention forms an automatic spray gun with a driven part provided with a driven piston capable of regulating the opening width of the paint nozzle opening, and also combines an actuator with the driven part provided externally, a liquid, Because they communicate with each other, the amount of paint sprayed can be controlled from the outside, and the amount of paint sprayed depending on the object to be coated and its shape can be adjusted by remote control. Since they are communicated through a liquid pipe, there is no risk of sparks being generated due to electrical connections, etc., and safety can be ensured, providing excellent effects. In addition, in the device of the present invention, the actuating tool can be operated by a pulse motor, a template, a cam, a lever, or an appropriate linear or rotating device, and can be operated by an automatic spray gun other than those shown in the above embodiments. Various types of automatic spray guns may also be used.

[Brief explanation of drawings]

Fig. 1 is a line diagram showing an example of the use of the present invention, Fig. 2 is a sectional view showing an embodiment of the invention, Fig. 3 is a rear view of an automatic spray gun, and Fig. 4 is a diagram showing another example of the invention. FIG. 5 is a diagram illustrating a conventional device. 2... automatic spray gun, 3... needle valve, 4...
Driven piston, 5... Driven part, 6... Actuation tool, 1
0...Paint nozzle port, 53...Cylinder chamber, 64
...Cylinder chamber, 65...Operating cylinder.

Claims (1)

[Scope of utility model registration request] An automatic spray gun is equipped with a needle valve that comes into contact with and separates from a paint nozzle to open and close the paint nozzle opening, and a driven piston that comes into contact with the needle valve and can regulate the opening width of the paint nozzle opening is slidably housed in a cylinder chamber. The cylinder chamber is connected to the cylinder chamber of an actuating tool which is separately provided from the automatic spray gun and in which an externally operable actuating piston is housed, and which is used for operating the actuating piston. An automatic spray gun device characterized in that the driven pistons are movably communicated with each other via a liquid pipe.