JPH10392A - Structure for closing coating material circulating flow passage of manifold type automatic gun - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable easy changeover to a dead end supply system without allowing the return passage of a supply flow passage to act as a hindrance by fitting a blind plug to close the flow passage into the coating material circulating return passage on the automatic gun side of a manifold type automatic gun when three is no need for the circulating supply of the coating material. SOLUTION: The coating material supplying flow passage 2a of the manifold 2 and the supply flow passage 1a of an automatic gun body 1 are communicated with each other in a joint part. This joint part is sealed by an O-ring in the same manner as the return passage side. The return passage 2b of the automatic gun body 1b and the manifold 2 are bored approximately symmetrically with the supply flow passage 2a, 1a. The use of the gun as the dead end supply system is made possible by fitting the blind plug 3 into the return passage 1b. A user can easily change over the gun to the dead end supply system by fitting the blind plug 3 for closing the flow passage into the coating material circulating return passage 1b on the automatic gun side of the manifold type automatic gun. In addition, the pooling of the coating material is eliminated by projecting the blind plug 3 to the coating material central flow passage 1c.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a paint supply mechanism of a manifold type automatic gun which is mounted on an automatic painting machine such as a painting robot and performs spray painting.

[0002]

2. Description of the Related Art A manifold type automatic gun is a type in which a connection port of a paint joint and an air joint is collectively attached to a manifold which is separate from the automatic gun. The installation of the paint joint and the installation of the air joint are not performed in one direction, so that the connecting hose can be assembled behind the automatic gun by special parts such as an L-shaped mounting joint. However, since the automatic gun is easily stained by paint adhesion due to scattering of spray particles, it must be removed from the automatic coating machine during work or at the end of the work and always washed. At the time of this cleaning, the joint connected to the automatic gun is removed and cleaned each time. In addition, since the hoses are gathered rearward by the L-shaped joint or the like, the automatic gun has a complicated shape and has a drawback that cleaning is not easy.

[0003] The manifold attached to the automatic gun is
In order to improve the above difficulties, the shape of the automatic gun has been simplified as much as possible, and the paint flow path, remote control air flow path, and spray air flow path to be supplied to the automatic gun have been drilled in the manifold, and each connection has been made. The hoses can be easily attached by arranging the ports on one surface behind the manifold and collectively arranging them and attaching a one-touch joint or the like. When cleaning the automatic gun, the automatic gun alone can be easily attached and detached with a single bolt while the manifold is mounted on the automatic coating machine.The external shape of the manifold itself is also a simple shape that is easy to clean. Things.

[0004] The above-mentioned manifold type automatic gun is supplied by a liquid pump when a coating material such as paint is supplied to the automatic gun. Then, assuming a case of a coating material having a heavy precipitation in which a pigment or an aggregate having a high specific gravity is mixed, a manifold type automatic gun is provided with a sedimentation and a flow passage in the coating flow path of the coating material. In order to avoid clogging, a circulation flow path for constantly circulating and supplying the coating material is provided. However, in the case of coating materials that do not precipitate, such as coating materials that do not contain pigments, it is relatively often not necessary to circulate. When the circulating supply is not required, the circulating supply is disadvantageous in that a large amount of a cleaning agent is used at the time of cleaning, and there is no need to use an unnecessary paint hose in the circulating return path.

A liquid pump must be used to circulate and supply paint. However, in a general market, a coating material is stored in a relatively inexpensive paint pressurizing tank, and the paint is supplied to a spray gun by compressed air pressure. Many pressurized feeds of coating materials are performed. When supplying the coating material to the manifold type automatic gun by this paint pressure feed tank, since the return path of the circulation circuit of the manifold type automatic gun cannot be used,
The connection joint is removed from the paint hose connection port of the manifold and blind screws are used.

In the method of closing the circulation circuit by attaching a blind screw or the like to the paint hose connection port of the manifold when the circulation supply is not performed, the return path of the paint circulation circuit formed in the manifold and the return path of the automatic gun are provided. Since the inside is used in a state filled with the coating material, the paint filled in the return path at the time of washing or color change of the paint becomes a major obstacle, and the cleaning time increases or the return path after the color change. The problem that the different color paint mixes with the supply paint occurs.

[0007]

Since the paint supply flow path of the manifold type automatic gun forms a circulation circuit, it can be used to supply a coating material which does not require circulation supply, or to supply the paint by a paint supply tank. In the case of, the paint supply flow path serving as a circulation circuit interferes with supply at a dead end that does not use a return path, so that the return path of the supply flow path does not hinder the dead end supply easily. It is an object of the present invention to obtain a paint circulation channel closing structure that can be switched to a system.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a manifold having an air hose, a paint hose connection port, and a flow passage for a remote control air automatic spray gun provided separately is attached to the automatic spray gun. In a manifold type automatic gun in which a paint supply circulation flow path, a needle valve actuation air flow path, and a spray air flow path are formed in the manifold, when the circulation supply of the coating material is not required during spray coating,
This is a paint circulation flow path closing structure in which a blind plug for closing the flow path is fitted into the paint circulation return path on the automatic gun side of the manifold type automatic gun. Then, when a blind plug that closes the flow path is fitted into the return path, the blind plug protrudes to the circulation return path entrance portion of the paint center flow path, and the blind plug has a pull-out locking part at the time of removal. Is provided.

[0009]

The closing structure of the return circuit of the paint circulation supply circuit according to the present invention will be described with reference to FIG. 1 which is a sectional view of a paint center flow path to a paint nozzle of an automatic gun and a circulation circuit portion. In FIG.
The manifold (2) is joined to the automatic gun body (1) with one bolt described later. A paint supply path (2a) communicates with the paint supply path (1a) of the automatic gun body (1) in the manifold (2), and is bored into a paint center flow path (1c) in which a paint nozzle is screwed. In the case of the coating material circulating supply, the return path (1b) of the automatic gun body (1) and the return path (2b) of the manifold (2) are provided in the supply flow path (1a).
It is perforated symmetrically to (2a).

[0010] In the above configuration, when a coating material such as a coating material with a severe precipitation is supplied to the coating nozzle, the coating material is constantly circulating in this circulation circuit while maintaining a flow rate at which the coating material does not settle. Therefore, even when the coating material is being ejected from the paint nozzle, the coating material is circulated in an amount several times the amount of the ejected material so as to circulate at an appropriate speed. In the case of a coating material that does not require circulation, a blind plug (3) having a thickness fitting into the flow path diameter of the return path (1b) of the automatic gun body (1) is fitted to close the return path. The blind plug (3) has such a length that its tip protrudes into the paint center flow path (1c), and is set so that no gap is formed between the return path (1b) and the paint center flow path (1c).
This length is regulated by a groove (1d) formed in the automatic gun body (1) by a flange (3a) below the blind plug (3). An O-ring (4) is fitted between the inner periphery of the concave groove (1d) and the blind plug flange (3a), and when the manifold (2) is joined with one bolt, the manifold (2) is used. While being pressed and fixed, the flow path is completely shut off and sealed by the O-ring (4).

A projection (3) provided below the blind plug (3)
b) is for pulling out the blind plug (3), and the coating material may enter the gap into which the blind plug is inserted and be fixed, and is provided for facilitating pulling out.

With the above configuration, when the supply of the coating material is switched to the dead end system, one bolt connecting the manifold and the automatic gun body (1) is loosened, the automatic gun body (1) is removed, and the blind is removed. It is switched only by inserting the stopper (3), and no coating material remains on the return path.
Even if the material is supplied by the dead end method, no trouble occurs. The dead-end method and the circulating method of circulating supply do not require frequent switching operations, and are set to be substantially constant according to the type of coating material of the customer or the working conditions. In most cases, the subsequent switching is not required so much. Therefore, the present invention has a structure in which the customer can easily switch according to the application.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. However, overlapping parts described in the section of operation are omitted in principle. FIG. 1 is an enlarged cross-sectional view taken along the line AA of FIG. 2 in which a blind plug is fitted into the return path of the paint circulation circuit of the manifold type automatic gun according to the present invention.

In FIG. 1, the coating material supply flow path 2a of the manifold 2 communicates with the supply flow path 1a of the automatic gun body 1 at the joint, and the joint is sealed with an O-ring 5 in the same manner as the return path. Have been. The bush 6 is press-fitted into the supply flow path 1a of the automatic gun body 1 so that even if there is a casting cavity at the time of casting, a measure such as leakage is prevented. The supply path 1a is perforated in the paint center flow path 1c in parallel with the return path 1b, and is opened so that the coating material flows in a tangential direction to the paint center flow path 1C. Care is taken so that no sedimentation of the coating material occurs even in the central channel 1c. Return 1 of the automatic gun body 1
b and the return path 2b of the manifold 2
Although the holes are symmetrically formed with a and 1a, the perforation arrangement of the flow path does not limit the present invention. Return 1b
The bush 7 is press-fitted for the same reason as in the supply flow path 1a. The blind plug 3 is fitted into the return path 1b and used as a dead end supply system.

The blind plug 3 fitted into the return path 1b formed in the bush 7 pressed into the automatic gun body 1 is
A cylindrical body having a diameter that can be easily inserted into the return path 1b by hand and that does not cause a large gap, and is made of stainless steel or high-density polyethylene that has organic solvent resistance and is difficult to adhere to paints and the like. Made of resin. A flange 3a is formed in a lower portion of the blind plug 3, and the tip of the blind plug 3 is formed to have a length slightly protruding into the central paint flow path 1c. The flange 3a is joined and regulated at the bottom of the concave groove 1d formed in the automatic gun body 1. The thickness of the flange 3a is the concave groove 1d.
Is formed with a thickness equal to or slightly smaller than the depth of the groove 2 so as not to protrude from the concave groove when the manifold 2 is joined. An O-ring 4 is fitted between the inner periphery of the concave groove and the flange 3a to seal leakage from the fitting gap of the blind plug 3, and
It serves to suppress the movement of the blind plug 3 by pressing when the manifold 2 is joined.

A projection 3b is provided at the lower end of the blind plug 3 as a locking portion for pulling out the blind plug 3 so as to fit in the return path 2b of the manifold. The projection 3b is grasped by hand and pulled out. This is provided in order to prevent the blind plug 3 from being easily removed when paint or the like enters and fits into the fitting gap of the blind plug 3. Therefore, the locking portion is not limited to the shape of the projection 3d of the embodiment. For example, a screw hole may be screwed in the center of the cylinder of the blind plug 3 and a screw may be screwed out when pulled out. It is also possible to provide a locking portion for facilitating pulling out.

FIG. 2 is a sectional view showing the overall structure of the manifold type automatic gun. In FIG. 2, 1 is an automatic gun body, 11 is a paint nozzle screwed to the automatic gun body, and an air cap 12 that is tapered and joined around the paint nozzle 11 is attached to the automatic gun body 1 by an air cap cover 13. It is installed. The air cap 12 is formed with a central air hole 12b which is mainly used to atomize the paint by an air jet from a ring-shaped slit formed on the outer periphery of the tip of the paint nozzle 11. Then, a flat pattern is formed by spraying in a fan shape by the side air holes 12a from the corners of the air cap 12. The side air holes 12a are independent flow passages in which the air flow paths of the center air hole 12b and the side air holes 12a are cut off at the tapered junction between the paint nozzle 11 and the air cap 12. Therefore,
According to the strength of the air jet from the side air holes 12a, the opening of the fan-shaped spray pattern that forms a flat pattern is changed. The needle valve 9 slides at the nozzle opening of the paint nozzle 11, and the reciprocating movement of the needle valve 9 constitutes the tip of an automatic gun that opens and closes the stoppage of paint ejection.

At the rear of the automatic gun body 1, an air piston 1 for opening and closing the needle valve 9 by remote control is provided.
4 is fitted in a cylinder 1e formed in the automatic gun body 1 so as to be slidable in an airtight manner. The air piston 14 has a center through hole for operating the needle valve 9 and an air valve 14a at the left end of the air piston 14.
Is the air valve seat 15 fitted to the automatic gun body 1.
The sheet is pressed by an air piston spring 16. Therefore, the air piston 14 also serves as the operation of the needle valve 9 and the role of the air valve. A spring receiver 17 is screwed to the right end of the needle valve 9 and a needle valve spring 18
The needle valve 9 is pressed against the nozzle port of the paint nozzle 11 by a taper at the tip of the needle valve 9. At the right end of the automatic gun body 1, a paint ejection amount adjusting device 19 is set on a spring retainer 20 and screwed to the automatic gun body 1. Paint ejection amount adjusting device 1 set on spring retainer 20
9 is moved left and right by turning the knob, and the right end of the needle valve 9 abuts on the adjustment rod 21a to limit the needle valve 9 from being pulled.
The amount of paint ejected is adjusted by the opening of a needle valve that slides on the nozzle opening.

The operation of the air piston 14 is performed by air introduced from the air passage 1f for operating the air piston formed in the manifold 2 and the blowing air passage 1g.
With the control from the central control panel, the air for operating the air piston
When the air is introduced from the flow path 1f, the air piston 14 is operated, the air valve 14a is opened, and the air from the blowing air flow path 1g is sent to the tip of the automatic gun body 1. Air valve 14a
Is opened, the air piston 14 comes into contact with the needle valve spring receiver 17 fixed to the needle valve 9 disposed at intervals of several mm, the needle valve 9 is pulled, and the paint is ejected. That is, the paint is ejected after the air is injected, and when the paint is closed, the air valve is closed after the ejection of the paint is stopped.

Manifold 2 joined to automatic gun body 1
The automatic gun body 1 is provided by a single hexagon socket head bolt 22.
Is to be fixed. Manifold 2 contains
A working air flow path 2f communicating with a working air introduction port 1f that operates the air piston 14, a blowing air flow path 2g communicating with a blowing air introduction port 1g, and a pattern adjustment communicating with a pattern adjustment flow path 1h of the automatic gun body 1. The flow path 2h is perforated, and the air supplied from the pattern control flow path 2h to the automatic gun body 1 is adjusted by the pattern control valve set 25 to perform fine adjustment of the pattern adjustment at hand of the automatic gun. A paint supply channel 2a is perforated below the pattern adjustment channel 2h. The through hole 2i provided in the manifold 2 is a holder hole for mounting on an automatic coating machine.
It is fixed to the inserted mounting rod or the like by the fixing bolt 23. An O-ring is fitted into each of the flow path outlets of the manifold 2 and the connection between the inlet flow paths of the automatic gun body 1 in the same manner as the O-rings 4 and 5 shown in FIG. Sealed with outside air. Therefore, at the time of maintenance, the automatic gun can be easily removed simply by loosening the one hexagon socket head bolt 22. A joint connection screw is cut on the rear surface of the manifold 2.

FIG. 3 is a side view from the rear of the manifold type automatic gun of FIG. In FIG. 3, an air flow path 2f for operating an air piston 14 connected to the needle valve 9, a center blowing air flow path 2g, a pattern adjusting air flow path 2h, and an inlet 2a of a paint supply flow path. The return path 2b in the case of paint circulation supply is perforated and a connection joint is attached. When the supply is switched to the dead-end supply according to the present invention, the return path 2b is not used. Therefore, the screw hole is closed by a simple resin cap 26 to prevent the screw portion from being stained.

[0022]

As described above, in the manifold type automatic gun, when the paint circulation supply is not required,
By inserting a blind plug that closes the flow path into the paint circulation return path on the automatic gun side of the manifold type automatic gun, customers can easily switch to the dead-end supply system and project the blind plug to the paint central flow path. By doing so, there is no paint pool that becomes a problem during cleaning and color change, and the manifold type automatic gun can be selected without any problem in either the circulation supply or the dead end supply system.

By providing a stopper for pulling out the blind plug on the blind plug fitted into the paint circulation return path, even if the blind plug is fixed to the automatic gun body by the coating material, the blind plug can be easily removed. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view taken along the line AA of FIG. 1, in which a blind plug is inserted into a manifold type automatic gun according to the present invention to provide a dead end supply system.

FIG. 2 is a cross-sectional view showing the overall configuration of a manifold type automatic gun embodying the present invention.

FIG. 3 is a side view of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automatic gun body 1a Paint supply flow path (automatic gun side) 1b Paint circulation return path (automatic gun side) 1c Paint center flow path 2 Manifold 2a Paint supply flow path (manifold side) 2b Paint circulation return path (manifold side) 3 Blind plug 3a Flange (blind plug) 3b Projection (blind plug locking portion) 4,5 O-ring 6,7 Bush 9 Needle valve 11 Paint nozzle 12 Air cap 19 Paint ejection amount adjusting device 22 Hexagon socket head bolt 25 Pattern adjusting device

Claims (2)

[Claims] 1. An air hose for a remote control air automatic spray gun, a connection port for a paint hose, and a manifold provided with separate flow passages thereof are attached to the automatic spray gun and integrated, and paint supply and circulation to the manifold. In a manifold type automatic gun in which a flow path, a needle valve operating air flow path, and a spray air flow path are provided, when the circulation supply of the coating material is not required during spray coating, the automatic gun side of the manifold type automatic gun is used. A paint circulation flow path closing structure in which a blind plug for closing the flow path is fitted into the paint circulation return path of (1). 2. A blind plug for closing a flow path is inserted into a paint circulation return on the automatic gun side of a manifold type automatic gun.
2. The paint circulation channel closing structure according to claim 1, wherein the blind plug protrudes to the circulation return path entrance of the paint center flow channel, and the blind plug is provided with a pull-out locking portion at the time of removal.