JP2007007509A - Valve device and coater using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To simply and surely clean and remove a coating material remaining in a main flow passage cleaned when a color is changed by eliminating a recessed part or a bent part where the coating material easily remains in the flow passage. <P>SOLUTION: Closing valves CV<SB>0</SB>-CV<SB>7</SB>to shutoff an opening part (13a) of a confluence passage (13) formed in the main flow passage (12) is included. The main flow passage (12) is formed into a straight flow passage having an inner surface formed to have a nearly cylindrical inner peripheral surface like uniform cross-section. Each of the closing valve (CV<SB>0</SB>-CV<SB>7</SB>) is provided with a recessed valve seat (14) formed on the inner surface of the main flow passage (12) and a valve body (15) for opening and closing the opening part (13a) by moving back and forth in the main flow passage (12) from the valve seat (14). The valve body (15) shuts off the recessed part of the valve seat (14) in the closed state and has a surface exposed to the main flow passage (12) to have the same surface profile as the inner surface of the main flow passage (12). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a valve device including a closing valve that blocks an opening of a confluence channel that supplies fluid to a main channel, and a coating machine that incorporates the valve device as a color change device.

The multicolor coating apparatus is equipped with a color changing device that selectively supplies a paint of an arbitrary color from each color paint.
In the color changing device 32 incorporated in the conventional coating machine 31 shown in FIGS. 3 and 4, for example, the color changing valves CV _{10 to} CV ₁₇ are arranged along the annular flow path 34 formed on the back side of the valve unit 33. At the same time, the cleaning fluid is supplied through the color change valve CV ₁₀ at the upstream end, and the color paints are supplied through the other color change valves CV _{11 to} CV ₁₇ .
The downstream end of the annular flow path 34 is connected to a feed pipe 38 inserted through a tubular rotary shaft 37 of an air motor 36 that drives the rotary atomizing head 35 of the coating machine 31.
JP 07-213957 A

Each of the color change valves CV _{10 to} CV ₁₇ is formed of an air operated type needle valve. By pulling the needle 39 with an air cylinder, the valve opening 40 communicating with the annular flow path 34 is opened to supply each color paint. It is supposed to be.

However, when a needle valve is used, the valve seat 41 must be provided so as to face the annular flow path 34, so that the opening 40 is recessed from the annular flow path 34 by at least the thickness of the valve seat 41. Even if the color change cleaning is performed, the paint tends to remain in the recesses in which the openings 40 of the color change valves CV _{10 to} CV ₁₇ are formed.
In addition, since the stagnation of the flow occurs at the bent portion formed between the annular flow path 34 and the feed pipe 38, the paint is likely to remain here.
Therefore, the remaining paint cannot be washed sufficiently, causing the remaining paint to solidify, resulting in poor coating, or the previous color remaining in the recesses or bends when the next color paint is supplied and applied. There was a risk of mixing colors with paint.

  In view of this, the present invention eliminates the recesses and bent portions where the paint tends to remain in the main flow path, and makes it possible to easily and reliably wash the paint adhering to the flow path when the color is washed. It is an issue.

  In order to solve this problem, a valve device according to the present invention includes a closing valve that closes an opening of a merging channel formed in a main channel, and the main channel has a substantially cylindrical inner peripheral surface. The closing valve is formed in a straight flow passage formed in a uniform cross section, and a concave valve seat formed on the inner surface of the main flow passage, and advances and retreats from the valve seat into the main flow passage to open and close the opening. In the closed state, the valve body closes the concave portion of the valve seat, and the surface exposed to the main channel is formed in the same surface shape as the inner surface of the main channel.

  Further, the coating machine according to the present invention includes a color change valve device that selectively supplies each color paint to the feed pipe of the atomizing mechanism, and the main flow path for supplying the paint from the color change valve apparatus and the feed pipe are linear flow paths. The main flow path is formed in a uniform cross section having an inner surface of a substantially cylindrical inner surface, and the color change valve device is provided with a merging flow path for supplying each color paint along the longitudinal direction of the main flow path. A color change valve that shuts off the opening of the main flow passage is provided, and the color change valve opens and closes the opening by moving back and forth into the main flow passage from the valve seat into the main flow passage. In the closed state, the valve body closes the concave portion of the valve seat, and the surface exposed to the main channel is formed in the same surface shape as the inner surface of the main channel.

According to the valve device of the present invention, the valve seat of the closing valve formed in the main flow path is formed in a concave shape on the inner surface of the main flow path, and the valve body closes the concave portion of the valve seat in the closed state and the main flow path. Since the exposed surface is formed in the same shape as the inner surface of the main flow path, when the closing valve is closed, the inner surface of the main flow path has a substantially cylindrical inner peripheral surface with no protrusions and no recesses. It becomes.
Therefore, when this valve device is built in a coating machine as a color change valve device, the remaining fluid remaining in the main flow path is neatly pressed out and adheres to the inner surface only by flowing the cleaning liquid into the main flow path. Since the fluid can be washed and removed neatly, it is excellent in color changeability.
In addition, since the main flow path and the feed pipe are straight and have no bent portion, the flow is less likely to stagnate.

  In this example, the purpose of enabling easy and reliable cleaning of the paint adhering to the flow path when color-washing is performed is achieved by eliminating the main flow path from recesses and bent portions where the paint tends to remain. did.

  FIG. 1 is an explanatory view showing a coating machine according to the present invention, and FIG. 2 is a horizontal sectional view showing an essential part thereof.

  A coating machine 1 shown in FIG. 1 is configured to drive a rotary atomizing head (atomizing mechanism) 5 fixed to a tubular rotary shaft 4 of an air motor 3 disposed on the front end side of the machine body 2 while rotating the high-speed rotation thereof. By selectively supplying each color paint from the main flow path 12 of the color change valve device 11 incorporated in the tube through the feed pipe 6 inserted into the tubular rotary shaft 4, the paint is atomized. .

The feed pipe 6 is opened in the bottom surface 7a of the case portion 7 formed on the back side of the machine body 2 in which the color change valve device 11 is loaded, and the main flow path 12 communicates with the feed pipe 6 in a state in which the color change valve device 11 is loaded. Since each is formed in a straight line shape, a straight flow path is formed when the main flow path 12 and the feed pipe 6 are communicated with each other.
Then, the color change valve device 11 is tightened by interposing the pressing rod 9 between the color change valve device 11 loaded in the case portion 7 and the lid 8 closing the rear end opening of the machine body 2. Is strongly pressed against the case bottom 7a, so that the main flow path 12 and the feed pipe 6 are securely connected.

The color change valve device 11 includes valve blocks 11A and 11B that are divided in half with respect to the main flow path 12. The main flow path 12 has an inner surface formed in a uniform cross section with a cylindrical inner peripheral surface. Color change valves (closure valves) CV _{0 to} CV ₇ for closing the openings 13 a of the merge flow path 13 for supplying each color paint and cleaning liquid along the longitudinal direction are provided on both the left and right sides.
Among these, the cleaning liquid is supplied to the color change valve CV ₀ located at the upper end, and the color paints are supplied to the other color change valves CV _{1 to} CV ₇ .

The color change valves CV _{0 to} CV ₇ include a concave valve seat 14 formed on the inner surface of the main flow path 12 and a resin valve that opens and closes from the valve seat 14 into the main flow path 12 to open and close the opening 13a. A body 15 is provided.
In this example, the valve seat 14 is formed in a concave spherical surface, and the valve body 15 is formed in a size that fits exactly into the concave portion.
The back surface of the valve body 15 is formed in a partial spherical surface that is in close contact with the valve seat 14, and the surface exposed to the main flow path 12 is formed in the same cylindrical inner peripheral surface as the inner surface of the main flow path 12.
As a result, the valve seat 14 is closed while the valve body 15 is closed, and the main flow path 12 has a uniform cross-section of a cylindrical inner peripheral surface with no protrusions and recesses on the inner surface.

The color change valves CV _{0 to} CV ₇ are configured such that the valve body 15 is urged by a spring 16 disposed outside the main flow path 12 and pressed against the valve seat 14 to close the opening 13a. It is a check valve that is opened by the pressure of the paint or cleaning liquid supplied from the merging channel 13.
Each merging channel 13 is provided with air operated type on / off valves SV _{0 to} SV ₇ for conducting / blocking each color paint and cleaning liquid, respectively, and paint / cleaning liquid hose (not shown) and operating air hose (not shown). (Not shown) is connected.
In addition,

The above is one configuration example of the present invention, and the operation thereof will be described next.
A paint / cleaning liquid hose (not shown) and an operating air hose (not shown) are connected to the on / off valves SV _{0 to} SV ₇ of the color change valve device 11 and loaded into the case portion 7 of the machine body 2, and the push rod By tightening the lid 8 with 9 interposed therebetween, the color change valve device 11 is strongly pressed against the bottom surface 7a of the case portion, whereby the main flow path 12 and the feed pipe 6 are securely connected.

Here, while the rotary atomizing head 5 is driven high speed, for example when opening the on-off valve SV _1, the paint of that color is supplied to the confluent channel 13, the valve element of the color change valve CV ₁ by the fluid pressure of paint 15 advances into the main flow path 12 against the tensile force of the spring 16, and the opening 13 a opens and is supplied from the main flow path 12 through the feed pipe 6 to the rotary atomizing head 5 and is rotated and atomized by centrifugal force. To be sprayed.

When painting is finished and the on / off valve SV ₁ is closed, the supply of paint to the merging flow is stopped, so that the valve body 15 of the color change valve CV ₁ is pressed against the valve seat 14 by the tensile force of the spring 16. The opening 13a is closed.
At this time, the valve seat 14 is formed in a concave spherical surface that is recessed from the inner surface of the main flow path 12, and the valve body 15 is formed in a size that fits exactly into the concave portion, and a surface exposed to the main flow path 12 side is formed. Since the concave spherical surface of the valve seat 14 is completely closed in a state where the valve body 15 is closed, the main flow path 12 has a convex portion on its inner surface. It becomes a uniform cross section of the inner circumferential surface of the cylinder without any recess.

When the color change cleaning is performed, when the on / off valve SV ₀ is opened and the cleaning liquid is supplied to the merging flow path 13, the color change valve CV ₀ is opened by the fluid pressure, and the atomization is performed from the main flow path 12 through the feed pipe 6. The foreground color paint which is supplied to the head 5 and remains in the meantime is washed away.
At this time, since the main channel 12 has a uniform cross section of a cylindrical inner peripheral surface with no protrusions or recesses on the inner surface, the paint remaining inside is pressed out and at the same time, the paint adhering to the inner surface Can also be removed easily.
Further, since a straight flow path is formed by the main flow path 12 and the feed pipe 6 and there is no bending point in the middle, it is difficult for stagnation of the flow, and therefore, the cleaning property is improved.

In the above description, the case where the color change valves (closing valves) CV _{0 to} CV ₇ are check valves has been described, but an on / off valve that opens and closes the valve body 15 with an air cylinder or the like may be used.

  As described above, the present invention can be applied to the use of a valve device that requires internal cleaning, and is particularly suitable for the use of a color change valve device built in a coating machine.

Explanatory drawing which shows the coating machine which concerns on this invention. The horizontal sectional view which shows the principal part. Explanatory drawing which shows a conventional apparatus. The plan view.

Explanation of symbols

1 Coating machine 5 Rotating atomizing head (Atomizing mechanism)
6 Feed pipe 11 Color change valve device 12 Main flow path 13 Merge flow path 13a Opening portion 14 Valve seat 15 Valve _element 16 Spring CV _{0 to} CV ₇ Color change valve (closed valve)

Claims (6)

  A valve device provided with a closing valve for blocking an opening of a confluence channel formed in a main channel, wherein the main channel is a linear channel whose inner surface is formed in a uniform cross section of a substantially cylindrical inner peripheral surface The closed valve includes a concave valve seat formed on the inner surface of the main flow path, and a valve body that moves forward and backward from the valve seat into the main flow path to open and close the opening, and the valve body is closed. A valve device characterized in that the concave portion of the valve seat is closed in a formed state, and a surface exposed to the main channel is formed in the same surface shape as the inner surface of the main channel.   The valve device according to claim 1, wherein a plurality of the closing valves are arranged along a longitudinal direction of the main flow path.   The valve device according to claim 1, wherein the valve seat is formed of a concave spherical surface.   The closing valve is a check valve that is closed by urging the valve body against the valve seat with a predetermined tensile force and opened by the pressure of the fluid supplied from the merging channel. 5. A valve device according to claim 4, further comprising an on / off valve for conducting / blocking the flow path. A coating machine with a built-in color change valve device that selectively supplies each color paint to the feed pipe of the atomization mechanism,
The main flow path for feeding paint from the color change valve device and the feed pipe are formed in a straight flow path, and the inner surface of the main flow path is formed in a uniform cross section of a substantially cylindrical inner peripheral surface,
The color change valve device is provided with a color change valve that blocks the opening of the merging flow path for supplying each color paint along the longitudinal direction of the main flow path,
The color change valve includes a concave valve seat formed on an inner surface of the main flow path, and a valve body that opens and closes from the valve seat into the main flow path to open and close the opening, and the valve body is in a closed state. The coating machine is characterized in that the concave portion of the valve seat is closed and the surface exposed to the main channel is formed in the same surface shape as the inner surface of the main channel. The color change valve is a check valve which is closed by urging the valve body against a valve seat with a predetermined tensile force and opened by the pressure of the fluid supplied from the merging channel. The coating machine according to claim 5, further comprising an on / off valve for conducting / blocking the flow path.

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