JPH04134457U - paint supply device - Google Patents

Abstract

(57) [Summary] [Purpose] It is possible to effectively prevent deformation of the valve seat base and reliably maintain the desired sealing performance, thereby performing efficient and highly accurate color change painting work. [Structure] A flow path member 26 forming a part of a paint flow path 22 communicating with a coating machine, a plurality of three-way switching valves 12 that supply a predetermined paint to this flow path member 26, and the flow path member 26. A sealing member 36 that seals the mating surface with the three-way switching valve 12
The three-way switching valve 12 includes a valve body 24 and a resin valve seat 32, and an end 34 of the valve seat 32 opposite to the valve seat 30 and the valve body 24. A gap 38 is formed between the flow path member 26 and the seal member 36 .

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention is a multiplex system that selectively supplies a predetermined paint to a paint flow path communicating with a paint sprayer. This invention relates to a paint supply device equipped with several three-way valves.

0002

[Conventional technology]

For example, when it comes to objects to be painted such as automobile bodies, there are usually many different types of objects even if they are of the same type. It is often painted in a different color. This allows a single sprayer to produce a variety of different colors. A paint that selectively supplies paint of a predetermined color to this paint machine to perform painting work. A feeding device is employed. As this type of paint supply device, for example, The technical idea is disclosed in JP 0-45945 and the like.

0003 The paint supply device according to this prior art forms a part of the paint flow path communicating with the paint sprayer. A plurality of three-way valves are arranged in the flow path member, and the three-way valves are selectively energized. By this, a predetermined paint is supplied to the paint flow path, and various different paints are sent through the paint machine. It is designed to be painted in different colors.

0004 By the way, in this type of paint supply device, the valve seat that constitutes the valve seat of the paint outlet and the This joint is designed to prevent paint from entering the gap between the mating surfaces with the flow path members. A seal member is placed on the surface, and the position of this seal member is generally The location is chosen to be close to the valve seat to reduce the amount of material intrusion.

[0005]

[Problem that the idea aims to solve]

However, since the sealing member is close to the valve seat, it is difficult to connect the valve seat base from the paint flow path. There are many cases where the paint that has entered the gap between the mating surface with the flow path member comes into contact with the sealing member. This tends to cause the sealing member to swell. Therefore, usually acetal resin etc. The problem is that the formed valve seat is deformed due to swelling of the sealing member. There is a problem. If this valve seat deforms, the sealing performance will be incomplete. In particular, when multiple three-way switching valves are used in color change painting, If paint of another color is being supplied to the paint flow path by another three-way valve, the sealing performance may be poor. It flows into the complete three-way valve. This allows other colors of paint to circulate. The paint may mix with the paint in the paint tank, which is the paint supply source, and the desired There is a problem in that it becomes impossible to carry out painting work of the same color.

[0006] The present invention solves this kind of problem and effectively prevents deformation of the valve seat base. This ensures that the desired seal is maintained, which prevents mixing of different paints. It is possible to perform color change painting work efficiently and with high precision without causing any mismatch. The purpose of the present invention is to provide a paint supply device that can provide a suitable paint supply system.

[0007]

[Means to solve the problem]

In order to achieve the above object, the present invention has a part of the paint flow path communicating with the paint sprayer. A channel member to be formed; a plurality of three-way switching valves that supply a predetermined paint to the flow path member; a sealing member that seals a mating surface between the flow path member and the three-way switching valve; The seal member is provided at a paint outlet for feeding paint into the flow path member. It is characterized by being located at a position away from the valve seat.

[0008]

[Effect]

In the above paint supply device according to the present invention, the desired three-way switching valve is driven to guide the paint. The valve body is separated from the valve seat at the outlet, and the specified paint is supplied to the flow path member from this paint outlet. After the valve body and valve seat are engaged, the paint outlet is closed, while other The three-way switching valve is driven to introduce another paint into the flow path member. Here, the seal Because the member is placed at a position away from the valve seat provided at the paint outlet, Paint that enters the seal surface from this paint outlet side is difficult to contact with this seal member. This makes it possible to prevent the sealing member from swelling.

[0009]

【Example】 Examples of the paint supply device according to the present invention will be given, and with reference to the attached drawings. This will be explained in detail below.

0010 In FIG. 2, reference numeral 10 indicates a paint supply device according to this embodiment. This coating The paint supply device 10 is provided to correspond to different colors of paint used in painting work. A plurality of three-way switching valves 12 and a pump 1 that pumps a predetermined paint to the three-way switching valves 12. 4, and a circulation path 18 connected to the three-way switching valve 12 and including a tank 16. Each three-way switching valve 12 forms a part of a paint flow path 22 communicating with the coating machine 20. The flow path member 26 is connected to the flow path member 26.

[0011] As shown in FIG. It is equipped with a resin valve seat base 32 that constitutes a valve seat 30 of a paint outlet 28 for feeding the paint. At the same time, the end portion 34 of the valve seat base 32 on the opposite side from the valve seat 30 and the A gap for arranging a seal member 36 between the valve body 24 and the flow path member 26 38 is formed. This valve seat base 32 is a ring formed on the lower side of the valve body 24. It is attached to the valve body 24 via a shaped protrusion 40.

0012 A paint inlet 42 and a paint outlet 4 connected to the circulation path 18 are provided on both sides of the valve body 24. 4 is formed. A hole 46 is formed in the valve body 24 and is oriented in the vertical direction. At the same time, this hole 46 is opened through a hole 48 having an axis perpendicular to the hole 46. It communicates with the paint inlet 42. The upper side of the hole 46 is expanded through the stepped portion 46a. The paint is supplied to the expanding upper side through a small diameter hole 50 that is inclined with respect to the vertical direction. While the outlet 44 is in communication, there is a hole in the center of the valve seat 32 with the same diameter as the hole 46 and A paint outlet 28 is formed coaxially.

[0013] An opening 52 having a relatively large diameter is formed coaxially with the hole 46 on the upper side of the valve body 24. A fluid introduction port 54 communicates with the upper side of this opening 52 . of the opening 52 An opening 56 that extends through the valve body 24 and is oriented horizontally in the figure communicates with the lower side. At the same time, the openings 56 are closed on both sides of the valve body 24 to provide a viewing window 58a. , 58b are attached. A fixed cylinder 60 is disposed within the opening 52, and this fixed cylinder 60 One end of a coil spring 64 contacts a flange portion 62 formed at one end, The other end of this coil spring 64 engages with a piston member 66. this piston A valve body 70 is engaged with the member 66 via a nut member 68.

[0014] A locking portion 72 is provided at a predetermined position of the valve body 70, and the locking portion 72 and the piston A sleeve-shaped closure member 74 is held between the closure member 66 and the closure member 66. A large diameter portion 76 is formed at the end of the member 74 that engages with the locking portion 72 . Below the valve body 70 A seal portion 78 that engages with the valve seat 30 of the valve seat base 32 is formed at the end.

[0015] Next, the operation of the paint supply device 10 configured as described above will be explained.

[0016] First, the paint inlet 42 and the paint outlet 44 are connected to the circulation path 18, and the paint outlet 44 is connected to the circulation path 18. A fluid supply source (not shown) is connected to the port 54 . And this fluid source If the coil spring 64 is deenergized, the coil spring 64 disposed within the opening 52 is activated. The piston member 66 is pressed vertically upward by the force, and the piston member 66 The seal portion 78 of the engaged valve body 70 contacts the valve seat 30 and the paint outlet 28 opens. While being closed, the large diameter portion 76 of the closing member 74 separates from the stepped portion 46a.

[0017] Then, the pump 14 is driven and a predetermined amount of paint in the tank 16 is delivered to the paint inlet 42. After being introduced into the hole 46 through the hole 48, the hole 46 widens. The fluid flows from the upper side to the paint outlet 44 through the hole 50. This allows the paint to It will circulate through the circulation path 18. At that time, from the paint inlet 42 to the closing member 74, A part of the paint that has entered between the fixed cylinder 60 leaks and adheres to the sliding part of the piston member 66. When this paint dries, the piston member 66 may slide smoothly. It will no longer be carried out. Therefore, in the worst case, the seal on the valve seat 30 may become incomplete. There is a risk that color mixing may occur. Therefore, a peephole provided in the valve body 24 Check for this leaked paint from 58a and 58b and prevent these problems from occurring. I can do it.

[0018] Next, a predetermined three-way switching valve 12 of the paint supply device 10 is driven, and the paint sprayer 20 Paint of a desired color is supplied to the paint flow path 22 of. i.e., fluid supply (not shown) Driving air is supplied from the source to the port 54, and the piston member 66 is connected to the coil spring. It moves down integrally with the valve body 70 against the elastic force of the plug 64. Therefore, the closing member 74 The large-diameter portion 76 contacts the stepped portion 46a, while the seal portion 78 is inserted into the paint flow path 22. The paint outlet 28 is opened (see FIG. 3). Therefore, the paint inlet 42 and the paint Since the paint outlet 44 is blocked, the paint supplied to the paint inlet 42 flows through the hole 4. 6 to the paint flow path 22 from the paint outlet 28 of the valve seat 32, and from the paint machine 20. It is supplied to a workpiece (not shown).

[0019] In this way, a predetermined painting operation is performed on a workpiece (not shown) via the coating machine 20. After finishing, before starting the work of applying different colors to other types of work, apply the paint in advance. A cleaning operation inside the flow path 22 is performed. In other words, the neutering effect of the air supply source (not shown) A piston member 66 at the bottom is displaced vertically upward together with the valve body 70 to draw out the paint. Mouth 28 is closed. Then, a cleaning liquid such as thinner is supplied into the paint flow path 22. , after the paint remaining in this paint flow path 22 after the painting work is discharged to the outside, As described above, the desired three-way switching valve 12 is driven to supply the desired paint to the coating machine 20. The work to supply is carried out.

[0020] By the way, the paint flowing in the paint flow path 22 flows from the valve seat 30 side to the three-way switching valve. There is a possibility that the foreign substances may enter between the valve seat base 32 of No. 12 and the flow path member 26. At that time, the valve seat A sealing member is arranged between the valve seat base 32 and the flow path member 26 in the vicinity of the valve seat 30. In many cases, paint constantly comes into contact with this sealing member, causing swelling of the sealing member. stomach. In contrast, in this embodiment, a seal is placed on the opposite side of the valve seat 30 (upper side in the figure). Since the member 36 is arranged, the paint that has entered between the valve seat base 32 and the flow path member 26 is This makes it difficult for the material to adhere to the sealing member 36, effectively inhibiting the swelling of the sealing member 36. can be stopped. Therefore, deformation of the valve seat pedestal 32 may lead to a decrease in sealing performance. The effect is that it is possible to carry out efficient color change painting work without any problems. can get.

[0021] Furthermore, the end portion 34 of the valve seat base 32 opposite to the valve seat 30, the valve body 24, and the flow path member A gap 38 is formed between the seal member 26 and the seal member 36. There is. For this purpose, for example, a groove may be formed in the end portion 34 of the valve seat base 32, and a seal portion may be formed in this groove. The deformation of the valve seat base 32 that is likely to occur when the valve seat base 32 is configured to be fitted with the valve seat 36 is avoided as much as possible. This makes it possible to easily improve sealing performance.

[0022]

[Effect of the idea]

According to the paint supply device according to the present invention, the following effects can be obtained.

[0023] A sealing member inserted in the mating surface of the three-way switching valve and the flow path member Separate from the valve seat provided at the paint outlet for supplying paint from the valve to the flow path member. Because it is located in a position where the paint enters the mating surface from the paint outlet side, it It becomes difficult to contact the sealing member, and it is difficult to effectively prevent the swelling of the sealing member. can.

[0024] Moreover, the seal part is located in the gap formed between the end of the valve seat, the valve body, and the flow path member. Since the valve seat base is placed in such a way that it cannot be deformed even by swelling of the sealing member. It becomes possible to effectively prevent this. Therefore, it is difficult to maintain effective sealing performance. This enables efficient and highly accurate color change coating by preventing paint leakage and mixing of different paints. Installation work will be carried out.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a three-way switching valve constituting a paint supply device according to an embodiment of the present invention.

FIG. 2 is a schematic overall view of the three-way switching valve.

FIG. 3 is a vertical cross-sectional view of essential parts of the paint supply device.

[Explanation of symbols]

10...Paint supply device 12...Three-way switching valve 16...Tank 18...Circulation path 20...Painting machine 22...Paint flow path 24...Valve body 26...Flow path member 28...Paint outlet 30...Valve seat 32... Valve seat stand 34...End part 36...Seal member 38...Gap 70... Valve body 74...Closing member 78...Seal part

Claims (2)

[Scope of utility model registration request] 1. A flow path member forming a part of a paint flow path communicating with a coating machine, a plurality of three-way switching valves that supply a predetermined paint to the flow path member, and the flow path member and the three-way switching valve. and a sealing member for sealing a mating surface with the flow path member, and the sealing member is located at a position away from a valve seat provided at a paint outlet for feeding paint into the flow path member. Paint supply device. 2. The device according to claim 1, wherein the three-way switching valve includes a valve body and a resin valve seat base that constitutes a valve seat of the paint outlet, and the valve seat A paint supply device characterized in that a gap for arranging a sealing member is formed between an end opposite to the seat, the valve body, and the flow path member.