JP3325966B2 - Painting valve device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating valve device suitable for use in a danger area where flammable gas stays, such as a coating line.

[0002]

2. Description of the Related Art In general, pneumatic devices such as air valves and air cylinders are frequently used in washing lines and painting lines that use flammable fluids such as ethane and toluene to prevent accidents such as fires and explosions. The operation of these air valves and the like is controlled by supplying and discharging signal air via a separate electromagnetic valve installed in a safety zone.

[0003] Fig. 9 shows a conventional coating valve device using a color changing valve device and a coating device using a trigger valve and a dump valve of a coating machine as an example.

[0004] In the drawings, reference numeral 1 denotes a color changing valve device, and the color changing valve device 1 is provided with a manifold 2 having a paint passage (not shown) formed therein, and opposed to the manifold 2, respectively. An outlet (not shown) is composed of a plurality of paint valves 3A, 3B,... 3M, 3N (collectively, "paint valve 3") connected to the paint passage. An air valve that operates by supplying and discharging air is used. The paint valves 3A, 3B,... 3M, 3N
Are connected to paint tanks (all not shown) of A, B,..., M and N via paint pipes.

[0005] Reference numeral 4 denotes an air valve provided on the upstream side of the manifold 2, and 5 denotes a thinner valve as a cleaning liquid valve which is provided on the manifold 2 so as to face the air valve 4 and constitutes a cleaning valve device together with the air valve 4. Each of the air valve 4 and the thinner valve 5 is constituted by an air valve almost in the same manner as the paint valve 3. The air valve 4 and the thinner valve 5 are air piping,
It is connected to an air source and a thinner source (neither is shown) through a thinner pipe, and discharges air from the air valve 4 and thinner from the thinner valve 5 alternately a plurality of times when the paint color is switched. , For cleaning the paint passage of the manifold 2 and the paint pipe 11 described later.

Reference numeral 6 denotes a paint regulator provided on the downstream side of the manifold 2. The paint regulator 6 adjusts a valve opening degree in accordance with a control air pressure, and
It controls the pressure and discharge amount of the paint.

[0007] Reference numeral 7 denotes a rotary atomizing type electrostatic coating machine. The coating machine 7 has an atomizing head 7A located on the tip side for atomizing paint.
And are located in the circumferential direction on the outer peripheral side of the atomizing head 7A,
Along with a plurality of external electrodes (not shown) for charging the atomized paint particles, a trigger valve 8 for supplying the paint from the color changing valve device 1 to the atomizing head 7A is provided inside the coater 7, and a cleaning valve. There is provided a dump valve 9 for discharging the remaining paint, thinner, and the like to the waste liquid tank 10 at the time. Then, the coating machine 7 atomizes the paint supplied from the color changing valve device 1 via the trigger valve 8 and the like by the atomizing head 7A, and charges the paint particles by the respective external electrodes, thereby establishing a ground potential. A flying object is applied to an object to be coated (not shown), such as a car body or the like, to perform coating.

Reference numeral 11 denotes a paint pipe.
1 has a distal end connected to a feed tube (not shown) in the atomizing head 7A via a trigger valve 8, and a proximal end connected to a paint passage of the manifold 2 via a paint regulator 6.

Reference numerals 12, 12,... Denote signal air pipes for supplying signal air to the respective valves. The signal air pipes 12 have paint valves 3, air valves 4, thinner valves 5, trigger valves 8, It is connected to the dump valve 9 and its base end is connected to an air source (not shown) provided in the safety zone.

.., 13 are the signal air pipes 12.
The solenoid valves 13 are connected to a control device 15 to be described later via lead wires 14, 14,.... Each of the solenoid valves 13 is configured as, for example, a direct-acting solenoid valve having three ports and two positions.

Reference numeral 15 denotes a control device provided outside,
The control device 15 includes, for example, a sequencer or the like. Then, the control device 15 transmits an electric signal to each solenoid valve 13 via the lead wire 14 based on a coating program stored in advance, and opens and closes each solenoid valve 13 so that the paint valve 3 and the air valve 4 are opened. , Thinner valve 5, trigger valve 8, dump valve 9
The paint is supplied to the coating machine 7 by supplying and discharging signal air as control air.

The coating apparatus according to the prior art has the above-described configuration. When the control unit 15 opens each solenoid valve 13, the signal air pipe 12 provided with each solenoid valve 13 is opened.
The signal air is supplied to the paint valve 3, the air valve 4, and the thinner valve 5 of the color changing valve device 1. As a result, when these paint valves 3 and the like are operated to discharge paint,
This paint is supplied to the coating machine 7 via the paint pipe 11 and the like. In the coating machine 7, the trigger valve 8 and the dump valve 9 are operated by the flow of the signal air through the signal air pipe 12, and the paint supplied from the atomizing head 7A of the coating machine 7 is atomized. It is charged and applied to the substrate.

The symbol S shown by a two-dot chain line in FIG. 9 indicates a painting booth that isolates the painting area where the color changing valve device 1, the painting machine 7 and the like are arranged from an external safety zone.
Inside, air is circulated, and the paint particles floating inside are discharged by this air to maintain a coating environment.

[0014]

In the above-described color changing valve device 1 according to the prior art, the paint valve 3, the air valve 4,
Each of the thinner valve 5, the trigger valve 8, and the dump valve 9 is constituted by an air valve, and a separate solenoid valve 13, 13,... Provided outside the coating booth S is opened and closed to signal air to the paint valve 3 and the like. The safety is ensured by supplying and discharging

However, in the prior art, the paint valves 3A, 3B,... 3M, 3N, the air valve 4, the thinner valve 5 of the color changing valve device 1, the trigger valve 8 and the dump valve 9 of the coating machine 7 are provided.
Are connected to signal air pipes 12, 12,..., And solenoid valves 13, 13,.
... must be installed, so that each signal air pipe 12
However, there is a problem that not only the connection work and the mounting work such as the above become complicated, but also the maintainability is reduced, and the installation space is increased.

In particular, in a painting line for automobiles, home appliances, etc.,
Because many painting machines 7 are arranged in the painting booth S,
The total number of signal air pipes 12 increases. For this reason,
A large number of signal air pipes 12 make it easy to increase the size of the painting booth S, increase the amount of air required for ventilation in the painting booth S, and increase the painting cost significantly.

Further, since it is necessary to enlarge the connection opening of the coating booth S and to form a large number of connection openings in order to pass a large number of signal air pipes 12, it is necessary to maintain the sealing property of the coating booth S. However, there is a problem that safety is reduced.

Furthermore, in the prior art, signal air is supplied to the paint valve 3 and the like in the painting booth S by a separate solenoid valve 13 provided outside the painting booth S, so that the number of parts is reduced. In addition to the increase in complexity of the overall structure, the portion of each signal air pipe 12 located between the paint valve 3 and the like and each solenoid valve 13 becomes a delay element, and the response is greatly reduced. There is a problem that efficiency and the like are reduced.

Further, since the pipe length of the signal air pipe 12 differs depending on the system configuration, the coating system must be designed in consideration of the delay element caused by the pipe length each time, and the design work becomes complicated and complicated. There is a problem of doing.

On the other hand, in order to solve the problem of the prior art, a paint valve, an air valve, a thinner valve, a trigger valve, a dump valve and the like are constituted by explosion-proof solenoid valves, and paint, air, thinner, waste liquid and the like are explosion-proof. It is also conceivable to directly control by a type solenoid valve. However, if the explosion-proof solenoid valve is a pressure-resistant explosion-proof solenoid valve, oil-filled explosion-proof solenoid valve, or internal pressure explosion-proof solenoid valve, the ignition source is sealed inside, so the structure is complicated, heavy, and large. There's a problem. In addition, in the case of an intrinsically safe explosion-proof solenoid valve, the current value and the like are limited, so it is not essentially an ignition source, and its structure is simple and light, but the driving force of the valve is small, For example, it is not possible to directly control a paint fluid such as a paint and a thinner supplied at a pressure of about 4 to 7 kg / cm ² .

The present invention has been made in view of the above-mentioned problems of the prior art, and has a compact overall structure by controlling signal air and controlling a coating fluid using the signal air in the same casing. It is another object of the present invention to provide a coating valve device that can simplify the mounting operation and the like.

[0022]

In order to solve the above-mentioned problems, a coating valve device according to the present invention comprises a casing, a casing provided in the casing, one end of which is an inlet for a coating fluid, and the other end. A flow path whose side has become an outlet for the coating fluid, a valve seat located in the casing located in the middle of the flow path, and slidably provided in the casing,
A valve body away seated on the valve seat by the signal air supply and exhaust, the valve
The valve is provided between the body and the casing, and the valve body is normally closed.
A valve spring biased in the direction
And the signal air is supplied thereto.
Air for displacing the valve body in the valve opening direction against the valve spring
Chamber and, set in the casing at a distance from the valve body vignetting, signal air supply air to be selectively communicating to the air chamber
An intrinsically safe explosion-proof solenoid valve for signal air control having a port and an exhaust port, wherein the intrinsically safe explosion- proof solenoid valve is
And the air supply port and the exhaust port are
By selectively communicating, the valve element is actuated.
In that a structure for supplying and discharging because of the signal air.

Further, the coating valve device can be used as a paint valve of a color changing valve device.

The coating valve device can be used as a bypass valve, an inlet-side shaft washing valve, and an outlet-side shaft washing valve of a paint pump.

On the other hand, the coating valve device can be used as a thinner valve and an air valve of a cleaning valve device.

Further, the coating valve device can be used as a trigger valve and a dump valve of a coating machine.

[0027]

[Action] With the above configuration paint valve device, by an electric signal is inputted to the intrinsically safe solenoid valves, the essence
Safety explosion-proof solenoid valve defined in more casing to the valve body
And to feed and discharge the signal air toward the air chamber. The supply and discharge of the signal air causes the valve body to be separated from and seated on the valve seat, and the flow of the coating fluid flowing in the flow path of the casing is controlled.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In the embodiment, the same reference numerals are given to the same components as those in the conventional technique shown in FIG. 9 described above, and the description thereof will be omitted.

First, FIGS. 1 to 4 relate to a first embodiment of the present invention. In the drawings, reference numeral 21 denotes a color changing valve device applied to the present embodiment. Almost in the same manner as the color changing valve device 1 described above, a manifold 22 in which a paint passage (not shown) is formed, and an outlet 34B of a flow path 34 which is provided to face the manifold 22 and which will be described later, is connected to the paint passage. 23, a plurality of paint valves 23A, 23B,.
M, 23N (collectively referred to as “paint valve 23”), and the paint valves 23A, 23B,.
3N are paint pipes 23A1, 23B1,... 23M, respectively.
A, B,... M via 1, 23N1 (see FIG. 2)
And N color paint tanks (not shown).
However, the color changing valve device 21 according to the present embodiment is based on the prior art in that each paint valve 23 is constituted by a valve device 29 in which the safety valve 43 is integrated with an air valve 33 as described later. Is different from

Reference numeral 24 denotes an air valve provided on the upstream side of the manifold 22, and reference numeral 25 denotes a thinner valve as a cleaning liquid valve constituting a cleaning valve device together with the air valve 24. The air valve 24 and the thinner valve 25 are conventional. Air valve described in the technology 4,
Almost similarly to the thinner valve 5, it is connected to an air source and a thinner source (not shown) through an air pipe 24A and a thinner pipe 25A (see FIG. 2). Have been.

Reference numeral 26 denotes a trigger valve for supplying paint to the atomizing head 7A of the coating machine 7, and reference numeral 27 denotes a dump valve for discharging remaining paint, thinner, and the like during washing to the waste liquid tank 10, respectively. Although the valve 27 performs substantially the same operation as the trigger valve 8 and the dump valve 9 described in the related art, the valve device 2 is similar to the paint valve 23, the air valve 24, and the thinner valve 25.
9.

Numeral 28 denotes a signal air pipe mounted via a coating booth S. The signal air pipe 28 has a paint valve 23 and an air valve 24 at its distal ends, similarly to the signal air pipe 12 described in the prior art. , Thinner valve 25, trigger valve 26,
It is connected to the dump valve 27, and its base end is connected to an air source. However, according to the present embodiment, the signal air pipe 28
Are branched at a tip end thereof into a plurality of branch pipes 28A, 28A,..., And extend to the paint valve 23, the air valve 24, the thinner valve 25, the trigger valve 26, and the dump valve 27 through the respective branch pipes 28A. By being connected to these, the solenoid valve 13 provided in the middle of the signal air pipe 12 as in the related art can be omitted.

In FIG. 3, reference numeral 29 denotes a normally-closed type valve device which constitutes a paint valve 23, an air valve 24, a thinner valve 25, a trigger valve 26, a dump valve 27, and the like. An air valve 33 provided below the casing 30 and an intrinsically safe solenoid valve 43 as an intrinsically safe explosion-proof solenoid valve for signal air control integrally provided above the air valve 33 are provided. I have.

Here, the casing 30 is located on the lower side, and a lower casing 31 constituting a valve casing of the air valve 33 and an upper side of the lower casing 31 are provided. The upper casing 32 is formed in a stepped cylindrical shape.

Reference numeral 33 denotes an air valve.
Reference numeral 3 denotes a two-port, two-position spring return type air valve comprising the lower casing 31, a valve seat member 35 and a valve body 39, which will be described later, and is operated by signal air from the intrinsically safe solenoid valve 43. .

Numeral 34 denotes a flow path provided in the lower casing 31. One end of the flow path 34 is an inflow port 34A which opens to the outer peripheral surface of the lower casing 31, and the other end is a flow path 34A. Outlet 34 opening at the bottom of the
B.

Reference numeral 35 denotes an inlet 34A of the flow path 34 and an outlet 3
4B shows a cylindrical valve seat member provided on the lower casing 31 and located on the inner peripheral side of the upper end of the valve seat member 35. Is formed.

Reference numeral 36 denotes a valve chamber provided in the lower casing 31, and 37 denotes a stepped cylindrical retainer provided below the valve chamber 36, and the retainer 37 is provided with a ring seal 38 and the like. The valve body 39 is inserted through the valve chamber 36 so as to be displaceable in the axial direction.

Numeral 39 designates a valve element slidably provided in the valve chamber 36 in the axial direction. The valve element 39 has its distal end inserted through the retainer 37 and extends downward. Is a cover nut 41 described below provided on the upper end side of the valve chamber 36.
A piston 39A is formed at an intermediate portion thereof to define the inside of the valve chamber 36 as upper and lower air chambers A and B. A supply / discharge passage 40 is formed in the valve body 39. The upper end of the supply / discharge passage 40 opens at the upper end surface of the valve body 39, and the lower end of the supply / discharge passage 40 opens on the lower surface side of the piston 39A. are doing.

When the intrinsically safe solenoid valve 43 is closed as shown in FIG. 3, the valve body 39 is urged by the valve spring 42 to be displaced downward, seated on the valve seat 35A of the valve seat member 35 and closed. When the intrinsically safe solenoid valve 43 is opened and the signal air is supplied into the lower air chamber B via the supply / discharge passage 40, the valve element 39 causes the signal air to flow as shown in FIG. The valve is upwardly displaced by the pressure against a spring force of a valve spring 42 described later, and is separated from the valve seat 35A of the valve seat member 35 to open.

41 is a cover nut screwed on the upper side of the lower casing 31 to cover the upper opening of the valve chamber 36;
42 is the cover nut 41 and the piston 39A of the valve body 39.
And a valve spring provided between the valve spring 4 and the valve spring 4.
2 constantly biases the valve body 39 in the valve closing direction.

Reference numeral 43 denotes an intrinsically safe solenoid valve as an intrinsically safe explosion-proof solenoid valve integrally provided above the air valve 33. The intrinsically safe solenoid valve 43 includes an upper casing 32, a coil 50 and a plunger 52 to be described later. And the like, and is configured as a three-port, two-position direct-acting solenoid valve as in the prior art.

Reference numeral 44 denotes an air supply port provided in the upper casing 32, and reference numeral 45 denotes an exhaust port provided below the air supply port 44 and provided in the upper casing 32. The port 45 has an air supply port 44A and an exhaust port 45, one end of which extends into the upper casing 32 and opens.
A, and the other end side is open to the outer peripheral surface of the upper casing 32. Further, a branch pipe 28A of the signal air pipe 28 is connected to the air supply port 44, and signal air is supplied through the signal air pipe 28.

Reference numeral 46 denotes a valve chamber formed in the upper casing 32, and 47 denotes a supply / discharge port located at the lower side of the valve chamber 46 and provided at the center of the bottom of the upper casing 32.
The supply / discharge port 47 has an upper end opening into and communicating with the valve chamber 46, and a lower end opening into the cover nut 41 and communicating with the supply / discharge passage 40.

Reference numeral 48 denotes a solenoid provided on the upper surface side of the upper casing 32. The solenoid 48 includes a coil bobbin 49, a coil 50 wound around the coil bobbin 49 and resin-molded, and an inner peripheral portion of the upper end of the coil bobbin 49. A column 51 fitted to the side and formed in a substantially cylindrical shape from electromagnetic stainless steel or the like, and a plunger 52 formed at the lower side of the column 51 and inserted into the coil bobbin 49 and formed from electromagnetic stainless steel or the like. Have been.

The plunger 52 is constantly urged downward by a plunger spring 53 as a valve spring, and a disc 54 made of synthetic rubber or the like is provided on the lower surface thereof. And the plunger 52
As shown in FIG. 3, when the coil 50 is not energized, it is urged by the plunger spring 53 to be displaced downward so that the valve body 54 is seated in the air supply port 44A of the air supply port 44 while the coil 50 is energized. Sometimes, it is attracted to the column 51 and is displaced upward, so that the valve element 54 is separated from the air supply port 44A.

Reference numeral 55 denotes a flapper, which is provided between the exhaust port 45A of the exhaust port 45 and the supply / discharge port 47 and is provided in the valve chamber 46 and is a second valve body made of a synthetic rubber or the like in a disk shape. The flapper 55 includes a plurality of pins 56, 56,.
It is fixed to the lower surface side of the plunger 52 via (only one is shown), and is constantly urged upward by a flapper spring 57. The flapper 55 is displaced downward together with the plunger 52 when the coil 50 is not energized, and is displaced from the exhaust port 45A of the exhaust port 45. On the other hand, when the coil 50 is energized, the flapper 55 is displaced upward together with the plunger to the exhaust port 45A. It is designed to sit down.

3 and 4, reference numeral 58 denotes the lower casing 3.
1 shows a small-diameter seal confirmation hole drilled in the radial direction. The seal confirmation hole 58 leaks fluid such as paint in the flow path 34 to the outside when a seal member such as the ring seal 38 is damaged or deteriorated. By doing so, the sealability is confirmed.

Reference numeral 59 denotes a manual button located below the plunger 52 and provided in the radial direction of the upper casing 32. The manual button 59 is always radially outwardly provided by a spring (not shown). It is being rushed. The manual button 59 is pushed inward in the radial direction by an operator when the coil 50 is not energized, so that the plunger 52 is pressed.
Is forcibly displaced upward to manually operate the intrinsically safe solenoid valve 43.

The circuit diagram of FIG. 2 shows the overall structure of FIG. 1 and the structure of the valve device 29 of FIGS. 3 and 4 as an oil-pneumatic circuit. Has become.

[0051]

The valve device 29 according to the present embodiment and the coating device using the valve device 29 have the above-described configuration, and the operation as the coating device is not particularly different from that of the prior art. Therefore, the operation of the valve device 29 will be described.

First, as shown in FIG. 3, when the energization of the coil 50 is stopped and the plunger 52 is displaced downward by being urged by the plunger spring 53, the valve element 54 is turned on by the air supply port 44A of the air supply port 44. And sit on the flapper 5
Reference numeral 5 is separated from the exhaust port 45A of the exhaust port 45.

Thus, the lower air chamber B and the exhaust port 45
Are communicated via the supply / discharge passage 40, the supply / discharge port 47, and the valve chamber 46, and the signal air in the air chamber B is exhausted from the exhaust port 45 to reduce the pressure. Spring 4
2, the valve seat 35 is displaced downward, seated on the valve seat 35A of the valve seat member 35 and closed.

Next, as shown in FIG. 4, when the coil 50 of the intrinsically safe solenoid valve 43 is energized and the plunger 52 is attracted by the column 51 and is displaced upward, the valve element 54 is moved to the air supply port of the air supply port 44. The flapper 55 is seated on the exhaust port 45A of the exhaust port 45 while being separated from the seat 44A.

Thus, the branch pipe 2 of the signal air pipe 28
When the signal air from 8A flows into the valve chamber 46 from the air supply port 44 and is supplied from the valve chamber 46 to the air chamber B via the supply / discharge port 47 and the supply / discharge passage 40, the valve body of the air valve 33 39
Is displaced upward against the spring force of the valve spring 42 due to the pressure of the signal air, and separates from the valve seat 35A of the valve seat member 35 to communicate the inflow port 34A and the outflow port 34B of the flow path 34. Let it. The fluid such as paint and thinner supplied from the inlet 34A flows out of the outlet 34B into the paint passage of the manifold 22, and is sent into the paint pipe 11 and the like.

Further, in the coating machine 7, the trigger valve 26 and the dump valve 27 are operated by the electric signal from the control device 15, and the paint supplied from the atomizing head 7A of the coating machine 7 is atomized and charged. Apply to the substrate.

Thus, according to the present embodiment, the valve device 29
Since the intrinsically safe electromagnetic valve 43 is integrally provided above the air valve 33 in a single casing 30 to form a composite, and the signal air from the intrinsically safe electromagnetic valve 43 is used to operate the air valve 33, Low solenoid valve 43 and air valve 33
The air piping between them can be eliminated. As a result, it is possible to effectively prevent a delay from being caused by the signal air, improve the responsiveness, reduce the number of parts, simplify the entire structure, simplify the mounting work, and reduce the manufacturing cost and the like. be able to.

The valve device 29 is connected to the paint valve 23 and the air valve 2.
4. In the color changing valve device 21 used for the thinner valve 25,
The number of signal air pipes 28 provided in the coating area in the coating booth S can be greatly reduced. As a result, the work of attaching and connecting the signal air pipe 28 can be simplified, the maintainability and the like can be improved, the installation space of the entire color changing valve device 21 can be reduced, and the painting booth S can be downsized.
In addition, since the connection opening for inserting the signal air pipe 28 can be reduced, the sealing property of the coating booth S can be improved, and the safety can be improved.

Further, in the coating machine 7 using the valve device 29 for the trigger valve 26 and the dump valve 27, the air valve 33
And the distance to the intrinsically safe solenoid valve 43 can be shortened.
6. The response speed of the dump valve 27 can be increased, and controllability can be improved. In addition, when mounted on the reciprocator or robot of the coating machine 7 to perform reciprocating operation and control operation, the responsiveness can be improved by the reduced number of pipes.

Next, FIG. 5 shows a second embodiment of the present invention. The feature of this embodiment is that the air supply port and the exhaust port of the solenoid valve described in the first embodiment are interchanged, and the normally open state is achieved. This is a type of valve device.

That is, in FIG. 5, reference numeral 61 denotes an air supply port provided on the upper side of the upper casing 32;
And an exhaust port provided in the upper casing 32 and located on the upper side, the air supply port 61 and the exhaust port 62 have an air supply port 61A and an exhaust port 62A.

Thus, in the present embodiment having such a configuration, substantially the same effects as in the first embodiment can be obtained. However, in particular, according to the present embodiment, the valve device 29 can be configured as a normally open type.

In each of the above embodiments, the signal air pipe 2
Although the case where the signal air is individually supplied to each of the plurality of valve devices 29 through the branch pipe 28A of FIG. 8 has been exemplified, the air supply port 44 (6
1) A communication hole 65 may be formed, and a plurality of air supply ports 44 (61) may be connected to each other through the communication hole 65. In this case, the valve device 29 is integrated as a multiple valve. do it.

FIG. 7 shows a third embodiment of the present invention. This embodiment is characterized in that the valve device according to the present invention is used not only for a color changing valve device and a coating machine but also for a paint pump. It is in.

Reference numeral 71 denotes a paint pump which is provided in the paint pipe 11 and is provided on the side of the color changing valve device 21. The paint pump 71 includes a drive motor 72 and a drive motor 72.
The flashable gear pump 73 (hereinafter referred to as “gear pump 7”) as a coating gear pump attached to the output shaft side of
3)), a bypass valve 74 disposed in parallel with the paint line of the gear pump 73, and an inlet side shaft cleaning valve 75 connected to the inlet side of the gear pump 73 and supplying thinner from a thinner pipe 75A. And the gear pump 73
And an outlet-side shaft cleaning valve 76 that is connected to the outlet side of the tank and discharges the waste liquid to the waste liquid tank 10. However, the paint pump 71 is characterized in that the bypass valve 74, the inlet side shaft cleaning valve 75, and the outlet side shaft cleaning valve 76 are constituted by the valve device 29 according to the first embodiment described above.

The paint pump 71 drives the gear pump 73 by driving the drive motor 72 at the time of painting, and paints the designated paint from the color changing valve device 21 at a predetermined flow rate through the paint pipe 11 through the paint pipe 7. To supply.

On the other hand, at the time of washing, the gear pump 73 is opened by opening the bypass valve 74 and the shaft washing valves 75 and 76.
The flow path of the paint pipe 11 via the bypass valve 74 from the color changing valve device 21 to the coating machine 7 excluding the
And a flow path for cleaning the shaft portion of the above. The former flow path on the paint pipe 11 side is connected to the air valve 2 of the color changing valve device 21.
4. The color changing valve device 21, the paint pipe 11, and the coating machine 7 are cleaned at high speed by air and thinner alternately supplied from the thinner valve 25. The shaft portion of the latter gear pump 73 is
The cleaning is separately performed by the thinner supplied from the thinner pipe 75A.

However, in this embodiment, the bypass valve 74, the inlet-side shaft cleaning valve 75, and the outlet-side shaft cleaning valve 76 of the paint pump 71 are constituted by the valve device 29 shown in the first embodiment. Therefore, the responsiveness and cleaning performance of the paint pump 71 can be reliably improved, and the size and safety of the coating apparatus can be reduced.
Cost can be reduced.

FIG. 8 shows a fourth embodiment of the present invention. The feature of this embodiment is that a cleaning valve device is provided on the coating machine side.

Reference numeral 81 denotes a cleaning valve device, and the cleaning valve device 8
1 includes an air valve 82 and a thinner valve 83, and the air valve 8
2 is connected to the air pipe 82A, and the thinner valve 83 is connected to the thinner pipe 83A. Then, the air valve 82
The thinner valve 83 is constituted by the valve device 29.

The washing valve device 81 is connected to the coating machine 7.
At the time of cleaning, the coating machine 7, the atomizing head 7A and its vicinity are cleaned by alternately supplying air and thinner to the coating machine 7.

In the fourth embodiment configured as described above, the responsiveness of the cleaning valve device 81 can be improved as in the third embodiment.

In each of the above embodiments, the case where the valve device 29 is used for the coating machine 7, the color changing valve device 21, the paint pump 71, and the washing valve device 81 has been described as an example. The present invention is not limited to this, and may be applied to a coating apparatus of a type including the paint pump 71 and the cleaning valve device 81 together. Further, a coating device of a type in which a cleaning valve device 81 having a dump valve (not shown) in addition to the air valve 82 and the thinner valve 83 is disposed on the color changing valve device 21 side together with the coating pump 71, or the coating pump 7
1 and the cleaning valve device 81 may be used in a coating device or the like of a type in which the cleaning valve device 81 is disposed on the coating machine 7 side.

[0075]

As described in detail above, the coating according to the present invention
According to the valve device for valve , the valve seat and the
The valve seat is provided with a valve body which is detached from and seated on the valve seat.
An air chamber is defined in the shing and the casing is
Only set the intrinsically safe solenoid valve for the signal air control spaced from the valve body, the signal air from the main quality safe explosion-proof solenoid valve
Wherein by supplying and discharging the air chamber is separated seating the valve element on the valve seat, because was configured <br/> formed for opening and closing the flow path painting fluid flows, as described in the prior art, essentially There is no need to provide a separate air pipe between the safety explosion-proof solenoid valve and the casing, and it is possible to reliably prevent delays caused by the air pipe and improve responsiveness, thereby reducing the number of parts. Thus, the structure of the entire coating valve device can be simplified.

When the coating valve device according to the present invention is used for each valve of a color changing valve device, a paint pump, a washing valve device, and a coating machine, the number of air pipes provided in the coating area can be reduced. In addition, the responsiveness of each valve can be improved, and the control of the entire coating system can be reliably performed. Further, the mounting operation of the air piping, can improve maintainability or the like to simplify the connecting operation, it is possible to form a compact whole color changing valve device.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an overall configuration of a coating apparatus according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram illustrating an oil-pneumatic circuit of a coating apparatus including a color changing valve apparatus and a coating machine.

3 is a longitudinal sectional view showing a valve device used for a paint valve or the like in FIG. 1 in a closed state.

FIG. 4 is a longitudinal sectional view similar to FIG. 3, showing a state where the valve device is opened.

FIG. 5 is a longitudinal sectional view showing a valve device according to a second embodiment of the present invention.

FIG. 6 is a longitudinal sectional view showing a valve device according to a modification of the present invention.

FIG. 7 is a circuit diagram showing an oil-pneumatic circuit of a coating apparatus according to a third embodiment.

FIG. 8 is a circuit diagram showing an oil-pneumatic circuit of a coating apparatus according to a fourth embodiment.

FIG. 9 is a configuration diagram showing the overall configuration of a coating apparatus according to the related art.

[Explanation of symbols]

 7 Coating machine 21 Color change valve device 22 Manifold 23 Paint valve 26 Trigger valve 27 Dump valve 28 Signal air piping 29 Valve device 30 Casing 33 Air valve 34 Channel 34A Inlet 34B Outlet 35 Valve seat member 35A Valve seat 39 Valve body 43 Motoyasu solenoid valve (intrinsically safe explosion-proof solenoid valve) 71 Paint pump 73 Flashable gear pump (gear pump) 74 Bypass valve 75 Inlet-side shaft cleaning valve 76 Outlet-side shaft cleaning valve 81 Cleaning valve device 82 Air valve 83 Thinner valve

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ identification code FI B05B 15/02 B05B 15/02 (58) Field surveyed (Int.Cl. ⁷ , DB name) B05B 12/14 B05B 5/00 -5/16 F16K 31/06

Claims (5)

(57) [Claims] And 1. A casing, provided in the casing, a flow path other end becomes the outlet of the coating fluid at one end is the inlet of the paint fluid, wherein is located in the middle of the flow path a valve seat provided in the casing, slidably provided in the front Symbol casing, a valve body away seated on the valve seat by the signal air supply and exhaust, is provided between the valve body and the casing , The valve is normally closed
A valve spring biased in a valve direction and the valve body defined in the casing;
The valve air is supplied to the valve spring against the valve spring.
An air chamber for displacing the body in the opening direction, set in the casing at a distance from the valve body vignetting, diether
Air inlet and exhaust for signal air selectively communicated with the chamber
Consists of a intrinsically safe solenoid valves for signal air control and a mouth, the main quality safe explosion-proof solenoid valve, the air supply in energizing the external
Selectively opening and closing a port and an exhaust port to the air chamber;
This supplies and exhausts signal air for operating the valve element.
Configuration and was formed by coating a valve device for. 2. The coating valve device according to claim 1, which is used as a paint valve of a color changing valve device. 3. The coating valve device according to claim 1, wherein the valve device is used as a bypass valve, an inlet-side shaft cleaning valve, and an outlet-side shaft cleaning valve of a paint pump. 4. The coating valve device according to claim 1, which is used as a thinner valve and an air valve of the cleaning valve device. 5. The coating valve device according to claim 1, which is used as a trigger valve and a dump valve of a coating machine.