JP2003340322A - Automatic spray gun - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain an automatic spray gun constituted so as to separate a gun main body and a manifold part for constituting introducing and supply passages of a coating and compressed air, controlled in operation by the spray signal from the outside, capable of easily selecting whether the regulation of a spray pattern is on this side of the gun or remotely operated by control air to be properly used, and capable of being also used in a connected state. <P>SOLUTION: A control air introducing port is arranged to the rear surface of the manifold part, and an on/off means is provided to a communication passage of internal center air and pattern regulation air. At the time of communication, a pattern regulation valve is attached and, at the time of cutting off, a pattern regulation air introducing connection port is attached to correspond to both of the communication and cutting-off of center air and pattern regulation air. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air spray gun for atomizing paint with compressed air to coat an object to be coated, and more particularly to an automatic spray gun whose operation is controlled by a spray signal from the outside. The present invention relates to an automatic spray gun in which a manifold portion constituting a paint and compressed air introducing / supplying passage portion is separately configured to facilitate replacement of a gun body in an economical manner.

[0002] Manifolds are diversified according to usage conditions, and it is necessary that the compressed air introduction supply passages satisfy conditions such as supply conditions from the outside and presence / absence of internal adjustment, and arrangement of connecting parts. Therefore, the flexibility of the assembly configuration is required.

[0003]

2. Description of the Related Art In a manifold type automatic gun, the paint joint and air joint connection ports are collectively attached to a manifold that is separate from the spray gun, and only the spray gun is automatically painted during or after the work. It is effectively used because it is easy to replace when it is removed from the machine for inspection and cleaning, and hoses are put together to improve handling.

Since this manifold type automatic gun is mainly controlled by remote control, the control of the spray amount of the paint and the control of the spray pattern opening are mainly performed by the control box provided in the automatic coating machine. Since it requires manual adjustment at the gun hand so as to be able to respond to corrections when the spray pattern changes during the painting test to set the conditions, it has that function and can be easily switched. What you can do greatly improves convenience.

For this reason, in the prior art, Japanese Unexamined Patent Publication No. 9-2066035
A technique has been proposed in which a pattern control valve as shown in Fig. 2 is provided in the spray gun main body so that the spray gun main body can be switched and manually adjusted. However, in these cases, since the switching adjustment valve is installed in the main body of the spray gun, it is necessary to provide for each spray gun, the structure becomes complicated and the cost rises, and the function of the spray gun main body is simplified and only the main body is replaced and used. The advantages of the manifold type automatic gun that can be used are lost.

[0006]

DISCLOSURE OF THE INVENTION In a manifold type automatic gun, remote control of the spraying pattern is performed by controlling the supply air pressure from a control box that centrally controls the automatic painting machine as required, and manual adjustment of the spraying pattern by the hand of the spray gun. It is an object of the present invention to provide a manifold type automatic gun in which the switching mechanism and the adjusting mechanism are arranged on the manifold side and which can be mounted in a small space with a simplified structure.

[0007]

SUMMARY OF THE INVENTION The present invention comprises an air cap having an atomizing air hole and a pattern adjusting air hole, a paint nozzle, and a paint valve opening / closing means, and a paint supply port and an atomizing air supply port. And a spray gun body with a pattern adjustment air supply opening on the bottom, and a manifold with the paint supply port and the paint supply channel connected to each air supply port and the air supply channel are removable. It is a spray gun, and the connection part for supplying to each supply passage provided in the manifold is arranged on the rear surface side of the manifold, and passes through at least one of the atomizing air supply passage and the pattern adjustment air supply passage. A flow control valve for adjusting the amount of air to be supplied was arranged.

For this reason, the flow rate control valve for manual pattern adjustment is integrated in the rear part of the manifold together with the paint and air supply ports, so that it can be shared regardless of the spray gun to be replaced, and the spray gun body It can be simplified.

As one means, the manifold is provided with an atomizing air supply passage and a pattern adjusting air supply passage,
A communication path that connects the two paths is formed downstream of the supply path, and when controlled compressed air is supplied to each of the air supply paths, it is closed by the opening / closing means provided in this communication path, and only one of the inlets is closed. When the blowing air is supplied, the communication passage is opened, and the other supply passage is provided with a flow rate control valve at a position downstream of the communication passage.

With this, the patterns are controlled by the air sent to the respective air supply passages when the communication passages are closed and controlled separately, and when the communication passages are opened, the pattern is controlled from one inlet port. When the inflowing compressed air is supplied to one of the supply paths and also flows into the other supply path through the communication path, its flow rate or pressure is adjusted by the flow control valve, and as a result, the pattern is manually adjusted. be able to.

Further, when the compressed air is supplied to only one of the inlets, a flow rate control valve is directly provided in the communication passage, and when the supply passage to the other is closed, the compressed air is supplied to only one of the supply passages. When the flow rate control valve provided in the communication path is opened and the opening degree is adjusted, the compressed air flows into the other supply path, and the pattern can be manually adjusted in the same manner.

In the above structure, when the automatic gun is mounted on an automatic painting machine such as a painting robot to perform painting, particularly when teaching the painting operation by the painting robot and the shape of the article to be coated is complicated, It is necessary to finely adjust the opening of the spray pattern and the pattern shape while observing the spray state near the object to be coated. In that case, the central control box may be separated from the tip of the automatic gun, and if the operator makes adjustments, correct confirmation is difficult, and the work is complicated and extremely laborious.

As a result, it is possible to adjust the pattern while observing the spray state near the object to be coated. The operation is to adjust the side air pressure to an appropriate pressure with the regulator of the control box, By determining the opening of the flat spray pattern and finely adjusting the pattern with a control valve during a coating test, etc., a more appropriate coating finish can be obtained.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The basic mechanism of a spray gun body in a manifold type automatic gun is almost the same as that of a general automatic gun, in which an air piston is operated by remote control air and a needle valve interlocked with this is operated. Pull to stop the spray of paint. And, as a passage for introducing the blowing air for spraying fed from the manifold, a central air passage communicating with the air cap center hole portion and a side air passage communicating with the side air hole of the air cap corner portion are formed. Two channels are formed.

Usually, a pattern control valve is mounted in the side air flow passage of the automatic gun body, that is, in the middle of the pattern control flow passage, and the pattern is adjusted by this. That is, the central air passage is a passage for atomizing air, and the side air passage is a passage for pattern adjusting air. The spray pattern is determined by the balance of the flow rate of the compressed air supplied to these passages or the jet pressure, and the pattern is adjusted by adjusting at least one of the air flow paths.

Embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an external view showing the entire structure of a manifold type automatic gun, showing an example of use in which a pattern control valve is attached. FIG. 2 is a sectional view of the spray gun body. The spray gun body 1 is connected to and integrated with the manifold 20 with a fastener such as a screw.

In FIG. 2, 1 is a spray gun main body, 3
Is a paint nozzle that is screwed to the spray gun body, and the air cap 2 that surrounds the paint nozzle 3 and is taper-joined
Is attached to the main body by the air cap cover 4. The air cap 2 is formed with a central air hole 2b which is a main component for atomizing the paint by an air jet from a ring-shaped slit formed on the outer periphery of the tip of the paint nozzle 3.
Then, the side air holes 2a from the corners of the air cap 2 form a flat pattern by a fan-shaped spray.

The side air holes 2a are independent passages in which the air passages of the central air hole 2b and the side air holes 2a are blocked by the taper joint portion 2C of the paint nozzle 3 and the air cap 2. Therefore, depending on the strength of the air jet from the side air holes 2a, the action of changing the pattern opening of the spray pattern that spreads in a fan shape forming a flat pattern is performed. The needle valve 5 is slidably in contact with the nozzle opening of the paint nozzle 3, and the reciprocating motion of the needle valve 5 opens and closes to stop spraying the paint.

At the rear of the spray gun body 1, an air piston 6 for opening and closing the needle valve 5 by remote control is fitted in a piston chamber 61 bored in the body 1 in a hermetically slidable manner. . The needle valve 5 is pressed by a spring 10 provided at the right end of the air piston 6, and is pressed against the nozzle opening of the paint nozzle 3 by a taper of the needle valve tip. At the right end of the spray gun body 1, a paint ejection amount adjusting device 11 is set on a spring retainer 12 and screwed to the body 1. The paint adjusting knob 13 of the paint ejecting amount adjusting device 11 set on the spring retainer 12 is
The needle valve 5
The right end of the needle abuts on the adjusting rod 13a to limit the pulling margin of the needle valve 5, and the paint ejection amount is adjusted by the opening of the needle valve 5 slidingly seated on the nozzle opening of the paint nozzle 3.

The operation of the air piston 6 is configured so that the air flow path 22 for air piston operation provided in the manifold 20 shown in FIG. 3 and the piston chamber 61 of the spray gun body 1 communicate with each other. The air piston 6 is pushed to the right by the introduction of air, and the needle valve 5 is opened. The manifold 20 has a central air supply port 23 at the rear.
A and a pattern air supply port 23B are provided, pass through the respective supply passages 24A and 24B, and are connected to both the manifold 20 and the spray gun main body 1, and communication ports 25A and 25
B and 18A, 18B.

The communication ports 25A and 18A and 25B and 18B are positioned so as to communicate with each other when the spray gun body 1 and the manifold 20 are integrally mounted, and are joined together through packing or the like so as to prevent leakage. In FIG. 3, a communication path 26 that connects the communication paths 24A and 24B is formed, but the connection path 26 is blocked by a blind screw 29 that serves as an opening / closing means when attached and detached. As the opening / closing means, a valve body that can be operated from the outside may be provided instead of the blind screw 29. A blind screw 28 facing the outside is provided to shut off the communication path 26 from the outside.

FIG. 5 shows the arrangement of connection ports for supplying paint and air as seen from the rear surface of the manifold. The supply of the paint is introduced from the connection port 33, enters the interior of the paint nozzle 3 through the communication ports 34 and 1D (not shown), and is discharged from the tip. The paint sent to the paint nozzle 3 is discharged from the tip, and also passes through the communication passage 1E of the spray gun body 1, the communication port 35 of the manifold, and the connection port 36.
And forms a flow path for circulating the paint. If circulation is not required, a blind screw is attached to the connection port 36.

In the state shown in FIG. 3, when it is not necessary to adjust the spray gun at hand, pre-controlled blowing air is sent from the central air supply port and the pattern air supply port, and passes through the independent passage as it is. It is injected from each air hole of the air cap.

FIG. 4 shows a state of use different from that in FIG. 3, in which a flow rate control valve 30 is incorporated in the pattern control air introduction port 23B. The flow rate control valve 30 has a valve body 32 that comes into contact with and separates from a valve seat 31 provided at a position downstream of the communication path 26 in the passage of the pattern control air supply passage 24B and adjusts the flow rate by the opening degree. . Only a blind screw 28 for shutting off the outside is attached to the communication path 26. Others are the same as those in FIG. 3, and switching can be performed by a simple work of replacing the connecting joint parts.

In the state shown in FIG. 4, the air for spraying is introduced from the central air inlet 23A, passes through the supply passage 24A, the connecting openings 25A, 18A and 19A, and then the air cap 2 from the atomizing air passage of the spray gun body. Is sprayed from the atomized air hole 2a. On the other hand, the air that has flowed into the communication path 26 receives the flow control valve 3
0, and the amount of air passing through the supply path 24B is adjusted. The air whose flow rate is adjusted here is connected to the communication ports 25B, 18
After passing through B and 19B, it is sprayed from the pattern adjusting air passage of the spray gun main body through the pattern adjusting air hole 2b of the air cap 2 and adjusted to the required spray pattern.

In the above example, the flow rate control valve 30 is provided at the position of the pattern air inlet of FIG. 3, but as another embodiment, as shown in an example of FIG. A flow rate control valve 40 also serving as an amount adjusting means is interposed so that it can be adjusted from the outside, and the introduction from either the pattern air introduction port or the central air introduction port is stopped, and the air from the other air introduction port is removed. It is also possible to supply the adjusted air amount via the flow rate adjusting valve 40 to the air supply path leading to the stopped inlet.

[0027]

Industrial Applicability The spray control is remotely controlled by a predetermined supply air, and a pattern control valve is provided at a connection portion for supplying to the pattern control passage of the manifold, so that the coating condition of the automatic coating machine is set or As a manifold type automatic gun that can be adjusted nearby while checking the coating state during painting work, by removing the adjustment mechanism from the spray gun body and installing it on the manifold side that can be used in common, replacement and maintenance are possible. The frequent spray gun itself can be simplified to facilitate handling and reduce the cost of the replacement spray gun.

Further, since the paint and air supply connection parts and the adjusting part are centrally arranged on the rear surface, the supply hoses are well organized and easy to handle, and a spray gun is connected in the lateral direction to form a large pattern. It is possible to easily install and combine sprays or the like corresponding to a large discharge amount, and the range of use is greatly improved. In addition, by forming a communication passage in advance in the supply passages for the atomizing center air and the pattern adjusting air and providing an opening / closing means, when pattern control is performed by independent control air from the outside and manually in the manifold section. The method of adjustment can be selected, and the range of uses can be varied.

[Brief description of drawings]

FIG. 1 is an external view of a manifold automatic gun showing an embodiment of the present invention. FIG. 2 is a sectional view taken along the line AA of the spray gun main body shown in FIG. 1. FIG. 3 is a sectional view taken along the line BB of the manifold portion shown in FIG. FIG. 5 is a sectional view showing another embodiment of FIG. 3. FIG. 5 is a layout view of paint and air connection ports as seen from the rear surface of the manifold. FIG.

[Explanation of symbols]

1, spray gun body 2, air cap 2a, side air hole 2b, central air hole 3, paint nozzle 6, air piston 11, paint spray amount control device 18A, 18B, access port 20, manifold 23A, central air inlet 23B, pattern air inlet 25A, 25B, contact port 26, connecting path 28, 29, blind screw 30, flow control valve 31, valve seat 32, valve body

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Claims (3)

[Claims] 1. An air cap having an atomizing air hole and a pattern adjusting air hole, a paint nozzle, and a paint valve opening / closing means, the paint supply port, the atomizing air supply port, and the pattern adjusting air supply port being on the lower surface. In an automatic spray gun in which a spray gun main body opened to the front and a manifold having a paint supply port and an air supply route connected to the paint supply port and each air supply port are detachable from each other, The inlet for supplying to the supply passage has an air supply connecting portion from the outside arranged on the rear surface of the manifold, and the atomizing air supply passage and the pattern adjusting air supply passage connect both passages inside the manifold with the connecting passage. Automatic spray gun with opening and closing means 2. A means for opening and closing a communication path connecting the atomizing air supply path and the pattern adjusting air supply path provided in the manifold, and adjusting the flow rate to each air path at the downstream position of the communication path. The automatic spray gun according to claim 1, further comprising a flow rate control valve provided in at least one of the air supply passages. 3. A communication passage communicating between the atomizing air supply passage and the pattern adjusting air supply passage provided in the manifold is formed, and a flow rate adjusting valve is provided in the communication passage, and one inlet port is provided. The automatic spray gun according to claim 1, wherein more air is introduced, and air is supplied to the other supply path through the flow rate control valve.