JPH0420533Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a paint supply device, and more specifically,
It has a plurality of three-way valves that supply a predetermined paint to a paint flow path that communicates with the coating device, and the three-way valve is provided with a valve seat that is flush with the inner surface of the paint flow path. The end of the valve body that approaches and separates from the valve seat is configured to be substantially flush with the inner surface of the paint flow path, thereby making it possible to smoothly supply a predetermined paint to the paint flow path. The present invention relates to a paint supply device that makes it possible to efficiently clean the paint flow path.

[Background of the invention] For example, for objects to be painted such as automobile bodies, usually
Even if they are of the same type, they are often painted in a variety of different colors. For this reason, in order to perform coating operations in various different colors using a single coating device, a paint supply device is employed that selectively supplies paint of a predetermined color to the coating device. The technical concept of this type of paint supply device is disclosed in, for example, Japanese Patent Publication No. 60-45945.

That is, in the paint supply device according to the prior art described above, a plurality of three-way valves are arranged in the paint flow path communicating with the coating device, and by selectively energizing the three-way valves, a predetermined paint is supplied to the paint supply device. The paint is supplied to a paint flow path and is configured to perform painting operations of various different colors via a painting device.

In this case, the paint supply device is generally provided with a plurality of three-way valves as shown in FIG. That is, a paint inlet 4 is formed at one end of the three-way valve 2, and paint is introduced into the paint inlet 4 from a pump (not shown). This paint is applied to the three-way valve 2.
After flowing into the paint outlet 10 between the first inclined portion 6a of the valve body 6 and the first valve seat portion 8 disposed in the valve body 6, the paint is supplied to the pump via a circulation path (not shown). ing.

In this state, the valve body 6 of the three-way valve 2 is
In the figure, it is displaced upward (in the direction of the arrow) to engage the first inclined portion 6a with the first valve seat portion 8. For this reason,
A second inclined portion 6b provided at the end of the valve body 6
is separated from the second valve seat part 12, and the paint supplied from the paint inlet 4 is introduced into the paint flow path 14 from between the second inclined part 6b and the second valve seat part 12, and is further not shown. It will be supplied to the coating equipment.

By the way, in the paint supply device, when changing the color of the paint supplied to the coating device, cleaning work of the paint flow path 14 shown in FIG. 1 is required. This is because if there is any paint left in the paint flow path 14 after the painting process, new paint will be mixed in with the remaining paint, making it impossible to perform a good painting job on the object to be painted. .

Therefore, in practice, in FIG. 1, the valve body 6
The cleaning operation of the paint flow path 14 is carried out by displacing the paint flow path 14 downward and allowing a cleaning liquid such as thinner to flow through the paint flow path 14 while the second inclined portion 6b is brought into contact with the second valve seat portion 12. is going on. However,
In the conventional three-way valve 2, in particular, a recess 16 that communicates with the paint flow path 14 is defined between the second inclined portion 6b of the valve body 6 and the second valve seat portion 12. For this reason, when the cleaning liquid is made to flow through the paint channel 14, it becomes difficult to effectively remove the paint remaining in the recess 16. In the end, cleaning work took a considerable amount of time, making it impossible to achieve efficient cleaning work.
Moreover, since a large amount of cleaning liquid is used, there is a problem that it is not economical.

[Purpose of the invention] The present invention has been made to overcome the above-mentioned disadvantages, and is provided with a plurality of three-way valves communicating with the paint flow path of the coating device, and the three-way valves are connected to the inner surface of the paint flow path. forming valve seats that are flush with each other, and arranging a valve body that approaches and separates from the paint flow path side on the valve seat;
Further, when the valve body engages with the valve seat, the end face of the valve body is configured to be substantially flush with the inner surface of the paint flow path, thereby allowing paint to flow between the valve body and the paint flow path. No remaining recesses are formed, making it possible to make the cleaning work of the paint flow path more efficient and economical, and also ensure a smooth flow of paint to ensure effective paint supply work. The purpose of the present invention is to provide a paint supply device that enables the following.

[Means for achieving the object] In order to achieve the above object, the present invention has a plurality of three-way valves that supply a predetermined paint to a paint flow path communicating with a coating device, and the paint guide of the three-way valve A valve seat provided at the outlet is formed on the same surface as the inner surface of the paint flow path, and a valve element that approaches and separates from the valve seat to open and close the paint outlet is disposed on the paint flow path side, and the valve element is arranged on the paint flow path side. The present invention is characterized in that the end of the valve body is configured to be substantially flush with the inner surface of the paint flow path when the outlet is closed.

[Embodiments] Next, preferred embodiments of the paint supply device according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 2, reference numeral 20 indicates a paint supply device according to this embodiment. The paint supply device 20
Actually, it includes a plurality of three-way valves 22 provided corresponding to different colors of paint used in painting work, and a pump 24 that pumps predetermined paints to the three-way valves 22.
is connected to the three-way valve 22 and the tank 2
6 and a circulation path 28 including 6. Each three-way valve 22 connects a paint flow path 3 that communicates with the coating device 30.
The paint of a predetermined color is selectively supplied to the paint of a predetermined color.

That is, as shown in FIGS. 3 and 4 a and b, the paint channel 32 is substantially connected to the channel member 34.
A stepped hole 35 is defined within the flow path member 34 and communicates with the paint flow path 32 at a predetermined position of the flow path member 34.
are bored corresponding to the number of three-way valves 22.

On the other hand, the paint supply device 20 basically includes a valve body 36 and a housing 38.
A paint inlet 4 is connected to the circulation path 28 on both sides of the paint inlet 4.
2 and a paint outlet 44 are formed. In this case, a hole 46 is formed in the valve body 36 and is oriented in the vertical direction in FIG. communicate with. The upper side of the hole 46 is a stepped portion 46
a, and the paint outlet 44 communicates with the expanding upper side through a small-diameter hole 50 that is inclined with respect to the vertical direction. On the other hand, the lower side of the hole 46 is similarly expanded, and a locking protrusion 52 is formed bulging radially inward on the inner peripheral surface defining the lower side. A substantially cylindrical valve seat base 54 is attached to the valve body 36 via the protrusion 52 .

The valve seat base 54 is made of a resin with excellent wear resistance and chemical resistance, such as fluororesin, and is fitted into a stepped hole 35 provided in the flow path member 34 . and ensure the liquid tightness of the valve body 36. A valve seat 56 is formed at the end of the valve seat 54 and is flush with the inner surface of the paint flow path 32 when the valve seat 54 is fitted into the stepped hole 35 (see FIGS. 4a and 4). b). Further, a paint outlet 58 is bored in the center of the valve seat 54 so as to have the same diameter and the same axis as the hole 46 of the valve body 36 .

Next, a relatively large-diameter opening 60 is formed in the housing 38 coaxially with the hole 46 of the valve body 36, and a fluid introduction port 62 communicates with the upper side of the opening 60 in FIG. do. One end of the hole 64 communicates with the lower side of the opening 60, and this hole 6
4 is opened to the outside from the side of the housing 38.

Therefore, a fixed cylinder 66 is disposed within the opening 60. A large diameter flange portion 68 is formed at one end edge of the fixed tube 66.
is held between the valve body 36 and the housing 38, and one short end of the fixed cylinder 66 fits into the expanding upper side of the hole 46. Fixed tube 66
A coil spring 70 is mounted on the other long end of the coil spring 70. One end of the coil spring 70 is in contact with the flange portion 68, and the other end is a piston member 72.
engage with. This piston member 72 has an opening 60
The opening 60 is divided into a first chamber 60a and a second chamber 60b by fitting into the piston member 72, and a valve body 74 is engaged with the piston member 72.

A threaded groove 76 is formed over a predetermined length on the outer periphery of one end of the valve body 74, and a locking portion 78 having a larger diameter is provided at a position spaced apart from the one end by a predetermined distance. The valve seat 56 of the valve seat base 54 is located at the other end of the valve body 74.
A sealing member 80 that engages with is formed, and the sealing portion 80 is oriented vertically downward in FIG. 3 and expands in diameter in a radial outward direction. Further, when the seal portion 80 engages with the valve seat 56 and closes the paint outlet 58, the end face 80a of the seal portion 80 is configured to be substantially flush with the inner surface of the paint flow path 32.

The nut member 82 is screwed into the screw groove 76 of the valve body 74 configured as described above, and the valve body 74 is
A sleeve-shaped closing member 84 that is fitted onto the outside is held by the locking portion 78 and the piston member 72. The closing member 84 is fitted into the fixed tube 66 and has a large diameter portion 86 at the end that engages with the locking portion 78 .

In the figure, reference numerals 88a to 88c indicate sealing members, and reference numeral 90 indicates an O-ring, each of which functions to ensure liquid-tightness and airtightness at the mounting site.

The paint supply device according to this embodiment is basically constructed as described above, and its operation and effects will be explained next.

First, the paint inlet 42 and the paint outlet 44 are connected to the circulation path 28, and the port 62 is communicated with a fluid supply source (not shown). If the fluid supply source is deenergized, the piston member 72 is pressed vertically upward by the elastic force of the coil spring 70 disposed within the opening 60. For this reason, the valve body 7 attached to the piston member 72
4 is in contact with the valve seat 56 and the outlet port 5 is closed.
8 is closed, and the large diameter portion 8 of the closing member 84
6 is separated from the stepped portion 46a.

Therefore, if the pump 24 is driven, the tank 26
A predetermined amount of paint is introduced into the paint inlet 42 and supplied to the hole 46 through the hole 48, and then passed from the expanding upper side of the hole 46 to the paint outlet 44 through the hole 50. Flow. This allows the paint to circulate through the circulation path 28.

Next, a predetermined three-way valve 22 of the paint supply device 20 is driven to supply paint of a desired color to the paint flow path 32 of the coating device 30. That is, in FIG. 3, when a predetermined amount of compressed air is introduced into the port 62 from a fluid supply source (not shown), this compressed air presses the piston member 72 vertically downward. Therefore, the piston member 72 is connected to the coil spring 7.
descends integrally with the valve body 74 against an elastic force of 0,
The large diameter portion 86 of the closing member 84 is held between the locking portion 78 of the valve body 74 and the piston member 72.
contacts the stepped portion 46a, while the seal portion 80 enters the paint flow path 32 to open the paint outlet 58 (see FIG. 4b). Therefore, since the paint inlet 42 and the paint outlet 44 are blocked, the paint inlet 4
The paint supplied to the paint flow path 32 flows from the hole 46 to the paint outlet 58 of the valve seat 54, and is sprayed from the coating device 30 onto a workpiece (not shown).

At this time, when the seal portion 80 of the valve body 74 is in contact with the valve seat 56, its end surface 80a is in contact with the valve seat 56.
It has a short and flat shape so that it is approximately on the same plane as the Therefore, even when the seal portion 80 is separated from the valve seat 56 to open the paint outlet 58, as shown in FIG. 4b, this seal portion 80
does not enter the paint flow path 32 very much.
As a result, the paint introduced into the paint flow path 32 from the paint inlet 42, hole 48, hole 46, and paint outlet 58 can be smoothly delivered to the coating device 30 side. Moreover, only the valve body 74 is disposed in the hole 46, and, for example, a coil spring 70 is disposed in the hole 46.
Compared to the case where a hole is provided in the hole 46, the paint can flow more smoothly.

Further, the large diameter portion 86 of the closing member 84 is connected to the stepped portion 46a.
When the paint outlet 44 and the paint inlet 42 are blocked by contacting the paint outlet 44, paint tends to settle on the paint outlet 44 side. However, in this embodiment, the hole 5 that communicates the paint outlet 44 and the hole 46 is
0 is formed to have a relatively small diameter and is provided at an angle with respect to the vertical direction. Therefore, the paint does not remain in the hole 50, and the paint effectively flows toward the paint outlet 44, thereby preventing the paint from settling.

In this way, after a predetermined painting operation is completed on a workpiece (not shown) via the coating device 30, and before starting the application operation of a different color on another type of workpiece, the interior of the paint flow path 32 is cleaned in advance. I do.

That is, in FIG. 3, when the air supply source (not shown) connected to the port 62 is deenergized, the piston member 72 is displaced vertically upward together with the valve body 74 through the elastic force of the coil spring 70. . Therefore, the large-diameter portion 86 of the closing member 84 that is externally fitted and held on the valve body 74 separates from the stepped portion 46a, and the seal portion 80 engages with the valve seat 56, closing the paint outlet 58. .

Next, a cleaning liquid such as thinner is supplied into the paint flow path 32, and the paint remaining in the paint flow path 32 after the painting operation is discharged to the outside.

In this case, in this embodiment, when the seal portion 80 is brought into contact with the valve seat 56, the end surface 80a of the seal portion 80 becomes substantially flush with the valve seat 56 and the inner surface of the paint flow path 32. Therefore, as shown in FIG. 4a, the cleaning liquid flowing through the paint flow path 32 is not blocked by the seal portion 80 of the valve body 74, and is not blocked by the seal portion 80 and the inner wall surface of the paint flow path 32. etc. can be effectively cleaned.

Furthermore, in the three-way valve 22, the seal portion 8
0 and the valve seat 56, unlike in the conventional case, there is no recess formed between the valve seat 56 and the valve seat 56. Therefore, it is possible to efficiently carry out the cleaning operation all at once. Moreover, since the cleaning work is completed in a short time, the amount of cleaning liquid such as thinner used in the cleaning work can be reduced at once, and there is a substantial advantage that it is extremely economical.

After completing the cleaning work in the paint flow path 32 in this manner, the three-way valve 22 that supplies paint of a desired color is operated according to the procedure described above, and the paint is supplied from the paint flow path 32 to the coating device 30. On the other hand, it is sufficient to supply the paint of the desired color.

[Effects of the invention] As described above, according to the invention, a plurality of three-way valves are arranged to supply paints of different colors to the paint flow paths communicating with the coating device, and the three-way valve A valve seat is provided on the same surface as the inner surface of the paint flow path,
Furthermore, the end face of the valve body that approaches and separates from the valve seat from the paint flow path side is configured to be substantially flush with the inner surface of the paint flow path. Therefore, when the valve body is separated from the valve seat in order to supply paint to the paint flow path, the end of the valve body does not enter the paint flow path much, and the paint is removed from the paint flow path. It can be smoothly supplied to the coating equipment. Moreover, when the valve body is engaged with the valve seat, the end surface of the valve body is located on substantially the same plane as the valve seat and the inner surface of the paint flow path. Therefore, when cleaning the paint flow path, the cleaning liquid does not come into contact with the valve element, or a recess is formed between the valve element and the valve seat, and paint does not remain in the recess. As a result, the cleaning work can be efficiently and reliably performed all at once.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and design changes can be made without departing from the gist of the present invention. Of course.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram of a three-way valve constituting a paint supply device according to the prior art, Fig. 2 is a schematic configuration diagram of a paint supply device according to the present invention, and Fig. 3 is a three-way valve constituting the paint supply device. FIGS. 4a and 4b are longitudinal cross-sectional views of FIG. 20...Paint supply device, 22...Three-way valve, 30
...Painting device, 32...Paint channel, 34...Flow path member, 36...Valve body, 38...Housing, 4
2... Paint inlet, 44... Paint outlet, 46... Hole, 54... Valve seat base, 56... Valve seat, 58... Paint outlet, 66... Fixed tube, 74... Valve body, 80
... Seal portion, 80a ... End surface.

Claims (1)

[Claims for Utility Model Registration] (1) It has a plurality of three-way valves for supplying a predetermined paint to a paint flow path communicating with a coating device, and a valve seat provided at a paint outlet of the three-way valve is connected to the paint flow path. A valve body is formed on the same surface as the inner surface of the passage, and is arranged on the paint flow path side to open and close the paint outlet by approaching and separating from the valve seat, and when the valve body closes the paint outlet, the valve body closes the paint outlet. A paint supply device characterized in that the end portion of the paint supply device is configured to be substantially flush with the inner surface of the paint flow path. (2) Utility Model Registration Scope of Claims In the device described in claim 1, the three-way valve has, in addition to a paint outlet, a paint inlet and a paint outlet connected to a circulation path for circulating the paint, and the paint inlet and A paint supply device configured to be able to communicate with a paint outlet through a passage communicating with the paint outlet, and in which the passage and the paint outlet communicate with each other through a small diameter and inclined hole.