JP3274516B2 - Wash valve device for paint flow path - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cleaning valve device for a paint flow path which is suitable for cleaning the inside of a paint passage such as a paint supply device for switching and supplying a plurality of colors of paint to a coating machine.

[0002]

2. Description of the Related Art FIGS. 6 to 9 show an example in which a cleaning valve device for a paint flow passage according to the prior art is used in a paint supply device.

In the drawing, reference numeral 1 denotes a color changing valve device, and the inside of the color changing valve device 1 is a paint passage (not shown), and a paint regulator 6, a paint pipe 9, a trigger valve 10, a pump 14 and a pump 14, which will be described later. A gate valve 3 provided on the most upstream side of the manifold 2 and connected to a washing valve device 15 described later; and a manifold 2 positioned downstream of the gate valve 3. Provided in
The outlet is constituted by a plurality of paint valves 4A, 4B,... 4M, 4N (collectively referred to as paint valves 4) and the like which are respectively connected to the paint passages. These gate valves 3 and paint valves 4 are pilot air type. Spring return type 2
A port 2 position switching valve is used and each valve is normally closed. The paint valves 4A, 4B,... 4M, 4N are connected to the paint valves 5A, 5B,.
.., M, N are connected to paint tanks (none of which are shown).

[0004] Reference numeral 6 denotes a paint regulator provided on the most downstream side of the manifold 2. The paint regulator 6 adjusts a valve opening degree in accordance with a control air pressure supplied from a control air pipe 7, thereby obtaining a paint. And the discharge amount.

[0005] Reference numeral 8 denotes a rotary atomizing type electrostatic coating machine. The coating machine 8 is provided with an atomizing head 8A for atomizing paint located at a front end side, and a base end side thereof. A plurality of external electrodes (not shown) are provided on the outer periphery so as to be separated from each other in the circumferential direction. The coating machine 8 sprays the paint supplied via the trigger valve 10 and the like by the atomizing head 8A, and charges the paint particles by the external electrodes, so that the object to be grounded has a ground potential. (Not shown).

Reference numeral 9 denotes a paint pipe disposed in the coating machine 8. The paint pipe 9 has a tip end connected to the atomizing head 8 A of the coating machine 8 and a base end facing the paint regulator 6.
Is connected to the paint passage of the manifold 2 via a.

Reference numeral 10 denotes a paint pipe 9 located in the coating machine 8.
And a trigger valve provided as a pilot-air type two-port two-position switching valve, which is opened and closed in accordance with the pilot air, so that the paint from the paint valve 4 Is supplied to the atomizing head 8A of the coating machine 8, and the paint is sprayed on an external object through the atomizing head 8A.

Reference numeral 11 denotes a drain pipe, and the drain pipe 1
One of the ends 1 is located in the middle of the paint pipe 9 so as to be located upstream of the trigger valve 10, and the other end is connected to a drainage tank 12 provided outside the coating machine 8.

[0013] 13 is provided in the middle of the drainage pipe 11,
This shows a dump valve configured as a pilot-air type spring return type two-port two-position switching valve. The dump valve 13 is opened at the time of cleaning, so that the paint and thinner remaining in the paint pipe 9 are drained from the drain tank 12. Is to be discharged inside.

Reference numeral 14 denotes a paint regulator 6 and a coating machine 8
And a gear-type pump provided between the
Numeral 4 is to supply a constant amount of the paint from the color changing valve device 1 to the coating machine 8.

Reference numeral 15 denotes a cleaning valve device provided on the upstream side of the manifold 2. As shown in FIG. 7, the cleaning valve device 15 includes a block main body 16, a thinner valve 24, an air valve 26, and the like, which will be described later. Have been.

First, reference numeral 16 denotes a rectangular parallelepiped block main body constituting the main body of the cleaning valve device 15.
6 are formed on the upper and lower end sides with shallow connection recesses 16A and 16B into which connection projections 24A and 26A of a thinner valve 24 and an air valve 26 described later are fitted. Further, the block main body 16 has a discharge passage 17 that opens toward one end and is connected to the gate valve 3 through a connection pipe 28 described later.
One end is connected to the discharge passage 17, the other end is a thinner passage 18 serving as a cleaning liquid passage opened in the connection recess 16 </ b> A, and one end is connected to the discharge passage 17, and the other end is opened in the connection recess 16 </ b> B. And a pair of valve housings 20A, one end of which communicates with the thinner passage 18 and the middle of the air passage 19, respectively, and opens toward the other end.
20B are formed.

Here, the passages 18 and 19 are connected to the outlet passages 18A and 19A connected to the discharge passage 17 so as to face the center of the discharge passage 17 from the radial direction (FIG. 8).
One end communicates with the outflow passages 18A, 19A,
Adjusting paths 18B and 19B having the other end communicating with one end of each of the valve element housings 20A and 20B;
A, 20B and communication path 24 between thinner valve 24 and air valve 26
B, 26B and the inflow passages 18C, 19C which are connected to each other to form a crank shape.

Reference numeral 21 denotes a thinner flow control valve mounted in the valve housing 20A, and reference numeral 22 denotes an air flow control valve mounted in the valve housing 20B. Reference numeral 22 denotes a regulating valve main body 21A formed in a cylindrical shape,
22A and the base end side is integrally fixed to the adjustment valve main bodies 21A and 22A, and the tip end side is the adjustment path 18 of each of the passages 18 and 19.
B, 19B, conical needle portions 21B, 22B whose diameter gradually decreases toward one side so as to enter the inside, and screw portions 21C, 22C formed on the outer peripheral side of the regulating valve bodies 21A, 22A. It is roughly composed of

Each of the flow rate regulating valves 21 and 22 is inserted into the valve body accommodating portions 20A and 20B while being screwed into the corresponding needle portion 21C.
The flow areas of the adjustment passages 18B and 19B are adjusted at the tips of B and 22B so that the flow rates of the thinner and air are set to a predetermined flow rate, and are fixed by nuts 23A and 23B in this state.

Reference numeral 24 denotes a thinner valve as a cleaning liquid valve provided on the upper end side of the block body 16.
Is configured as a pilot air type spring return type 2 port 2 position switching valve, the lower end of which is a connection recess 1
6A, and becomes the connection projection 24A.
A communication passage 24B communicating with the thinner passage 18 is provided at the center of 4A.
Are drilled. The thinner valve 24 is connected to a thinner source (not shown) via a thinner pipe 25, so that thinner from the thinner source flows through the thinner passage 18 in accordance with pilot air. .

Reference numeral 26 denotes an air valve provided on the lower end side of the block main body 16. The air valve 26 is configured as a pilot air type spring return type 2-port 2-position switching valve similarly to the thinner valve 24. Connection recess 1 at upper end
6B, and becomes the connection projection 26A.
A communication passage 26B communicating with the air passage 19 is formed at the center of 6A. The air valve 26 is connected to the air pipe 2
7, the air is connected to an air source (not shown) so that air from the air source flows through the air passage 19 in accordance with the pilot air.

The block body 16 has one end connected to the gate valve 3 and the other end connected to the discharge passage 17.
Shows a connection pipe connected to one end of the connection pipe.
At both ends, a flange portion 28A (only one is shown) which is fixed to the gate valve 3 and the block body 16 in a gas-liquid-tight manner is formed.

A coating apparatus using a conventional paint supply apparatus has the above-described configuration. Next, the operation of the coating apparatus will be described with reference to FIG.

First, in order to spray the color A paint, predetermined control air is supplied to the paint regulator 6 to open the valve. Next, when the A color paint valve 4A of the color changing valve device 1 and the trigger valve 10 in the coating machine 8 are opened, the A color paint in the paint tank is filled with the paint pipe 5A, the paint passage of the manifold 2,
It is supplied to the coating machine 8 via the pump 14, the paint pipe 9 and the like, and is atomized by the atomizing head 8A of the coating machine 8. The atomized A-color paint particles are charged to a predetermined voltage by each external electrode, and fly along an electric force line to an external object to be coated.

During this time, the paint regulator 6
When the pressure in the paint pipe 9 is high, the valve opening is narrowed to reduce the discharge amount. Conversely, when the pressure in the paint pipe 9 is low, the valve opening is Is increased to increase the discharge amount of the color A paint, thereby adjusting the pressure and the discharge amount of the color A paint to the set values.

Next, in order to perform the washing after the A-color coating process is completed, the A-color paint valve 4A and the trigger valve 10 are closed, and the control air supplied to the paint regulator 6 is cut off to close the valve. Let it.

Then, the gate valve 3 is opened to connect the washing valve device 15 and the color changing valve device 1 and the dump valve 13
Is opened to secure the drainage flow path, and the control air to the paint regulator 6 is further increased to maximize the valve opening. In this state, the air valve 26 of the cleaning valve device 15 is opened. Thus, the air flowing from the air valve 26 into the paint passage of the manifold 2 through the air passage 19 of the block body 16, the connection pipe 28, and the gate valve 3 flows through the paint passage, the paint regulator 6, the paint pipe 9, The A-color paint remaining in the pump 14 or the like is extruded and discharged from the dump valve 13 into the drain tank 12 through the drain pipe 11.

Next, by closing the air valve 26 and opening the thinner valve 24, the paint supplied to the manifold 2 by the thinner supplied from the thinner valve 24, the paint regulator 6, the paint pipe 9, the pump 14 Wash the A-color paint adhered to the dump valve 13, drain pipe 1
1 and discharged into the drainage tank 12. By repeating the supply of the air and thinner a plurality of times, the inside of the paint pipe 9 and the like is cleaned.

On the other hand, during the above-described cleaning process, the dump valve 13 is closed and the trigger valve 10 is opened, so that the air valve 26, the thinner valve 24 and the discharge passage 17,
Air selectively supplied via connection pipe 28, manifold 2, paint regulator 6, paint pipe 9, etc.
The thinner discharges the A-color paint remaining between the trigger valve 10 and the atomizing head 8A to the outside from the atomizing head 8A while cleaning, and cleans the tip side of the coating machine 8. In the second cleaning step, it is preferable to perform cleaning by alternately and repeatedly supplying air and thinner a plurality of times.

Next, the manifold 2, paint regulator 6, paint pipe 9,
After the cleaning of the pump 14 and the like is completed, the B color paint valve 4B
Is opened to fill the paint pipe 9 with the B color, and the trigger valve 1 is opened.
The valve 0 is opened, and a part of the B-color paint is discarded and sprayed to prepare for the B-color paint. Then, when the preparation for the B color coating is completed, similarly to the case of the A color coating described above,
The B color is supplied to the paint pipe 9 to perform the B color coating.

[0027]

By the way, in the above-described paint supply apparatus according to the prior art, air is discharged from the air passage 19 of the cleaning valve device 15 at the time of color change cleaning.
After the paint in the manifold 2 and the paint pipe 9 of the color changing valve device 1 is pushed out into the drainage tank 12, the paint adhered to the pipe wall and the inner wall of the manifold 2 and the paint pipe 9 is removed from the thinner passage 18. I wash it off with thinner.

However, since most of the paint remaining in the manifold 2 and the paint pipe 9 is pushed out by the first air from the cleaning valve device 15, thinner supplied after being pushed out by the air is supplied to the manifold 2, the paint 2, and the like. There is a problem that only a small amount of paint adhering to the pipe wall such as the pipe 9 is cleaned, the thinner consumption efficiency is low, and the cleaning efficiency is reduced.

That is, after the paint is pushed out by the air, the paint is only slightly attached to the pipe wall such as the inside of the manifold 2 or the paint pipe 9. And the paint adhered to the tube wall and the like cannot be effectively washed. Therefore, in order to completely remove paint adhering to the pipe wall etc., not only a large amount of thinner is required,
It takes a lot of cleaning time.

The present invention has been made in view of the above-mentioned problems of the prior art, and forms a swirling flow by a cleaning liquid and air in a discharge passage of a block main body, and the swirling flow effectively cleans a paint flow path. It is another object of the present invention to provide a paint flow path cleaning valve device capable of reducing the amount of cleaning liquid used.

[0031]

Means for Solving the Problems] To solve the problems described above, configurations in which the present invention is employed, the upstream side of the paint passage
It has a discharge passage that communicates and discharges the cleaning liquid into the discharge passage.
Cleaning liquid passage and an air passage for discharging air are provided.
Block body and the cleaning liquid passage of the block body
And a cleaning liquid for controlling the flow of the cleaning liquid to the cleaning liquid passage.
A valve connected to an air passage of the block body;
Paint flow consisting of an air valve that controls the flow of air to the passage
In the road cleaning valve device, the cleaning liquid passage of the block body extends tangentially along the outer periphery of the discharge passage.
An outflow passage for a cleaning liquid is provided, and an air passage of the block body is provided.
So that it is parallel and opposite to the outflow path for the washing liquid.
For air extending tangentially along the outer circumference of the discharge passage
The outflow path is provided for, and the outflow path and the outflow path for air for the cleaning liquid, it from the cleaning liquid and the air more said discharge exit passage to Rukoto to discharge the cleaning liquid and the air toward the discharge passage at the same time
It you are characterized where the structure forms a that swirling flow.

[0032]

According to the above construction, the outflow path for the cleaning liquid and the outflow path for the air are provided.
The outlet passage is a discharge passage that is parallel and opposite to each other.
Extending tangentially along the outer circumference of the
The inner can form a swirling stream comprising a cleaning liquid and the air, this <br/> swirling flow actively circulated inner wall of the paint passage by centrifugal force, the paint washed adhered to the inner wall of the paint passage To do
Can be .

[0033]

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 components as those of the prior art shown in FIGS. 6 to 9 are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, reference numeral 31 denotes a block main body according to the present embodiment, which constitutes the main body of the cleaning valve device 15. The block main body 31 has a rectangular parallelepiped shape substantially similar to the block main body 16 described in the prior art. In addition, on the lower end side,
The shallow connection recesses 31A and 31B into which the connection protrusions 24A and 26A of the thinner valve 24 and the air valve 26 are fitted are formed. The block main body 31 has a discharge passage 32 that opens toward one end and is connected to the gate valve 3 via a connection pipe 28, and one end is connected to the discharge passage 32,
A thinner passage 33 as a cleaning liquid passage having the other end opened into the connection recess 31A, and an air passage 3 having one end connected to the discharge passage 32 and the other end opening into the connection recess 31B.
And a valve housing 3 having one end communicating with the thinner passage 33 and the air passage 34 at one end, and opening toward the other end.
5A and 35B are formed.

Here, each of the passages 33 and 34 is shown in FIG.
As shown in FIG. 3, outflow passages 33A and 34A extending parallel to each other so as to be tangential to the outer periphery of the discharge passage 32 and connected to the discharge passage 32, and one end of the outflow passage 33A is connected to the outflow passage 33.
A, 34A, and the other end is connected to each of the valve element housings 35.
Adjustment paths 33B, 34B communicating with one ends of the A, 35B;
An inflow passage 33 connecting the valve housings 35A, 35B with the communication passages 24B, 26B of the thinner valve 24 and the air valve 26.
C and 34C to form a crank shape.

The passages 33 and 34 simultaneously discharge the thinner and air supplied through the thinner valve 24 and the air valve 26 from the outflow passages 33A and 34A into the discharge passage 32 during the color change cleaning. As shown by the arrow in FIG. 3, the thinner and the air are swirled while being mixed in the discharge passage 32, and the swirling flow by the thinner and the air is applied to the paint such as the manifold 2 and the paint pipe 9 via the connection pipe 28. The fluid is supplied to the channel.

The paint supply device according to the present embodiment has the above-described configuration, and its basic operation is not particularly different from that of the prior art. The operation of the cleaning valve device 15, which is a feature of the present embodiment, will be described with reference to FIG.

First, when the coating of the color A is completed, the trigger valve 10 is closed, the dump valve 13 is opened, the gate valve 3 is opened, and the washing valve device 15 is connected to the paint flow path. I do.

Next, when air is discharged from the air valve 26 of the cleaning valve device 15 into the discharge passage 32 via the air passage 34, the air is discharged through the connection pipe 28 and the gate valve 3 into the paint passage of the manifold 2. The A-color paint remaining in the paint passage, the paint regulator 6, the paint pipe 9 and the like is extruded into the external drain tank 12 and discharged.

Next, when the thinner valve 24 is opened with the air valve 26 kept open, the air from the air valve 26 and the thinner from the thinner valve 24 pass through the air passage 34 and the thinner passage 33, respectively. And simultaneously discharged into the discharge passage 32,
A swirling flow is formed in the discharge passage 32. Thus, the swirling air and thinner adhere to the pipe wall and inner wall of the manifold 2, paint regulator 6, paint pipe 9, trigger valve 10, pump 14, etc. via the connection pipe 28 and the gate valve 3. The paint is discharged into the drainage tank 12 while being intensively washed by the centrifugal force at the time of turning. Further, the tip side of the coating machine 8 is similarly cleaned by the swirling flow of the air and the thinner.

As shown in FIG. 4, the filling of the B color and the like do not differ from those according to the prior art, so that the description thereof will be omitted.

Thus, according to the present embodiment, the outflow passages 33A and 34A of the thinner passage 33 and the air passage 34 extend in parallel to each other so as to be tangential to the outer periphery of the discharge passage 32, and are formed in the discharge passage 32. Connected to each of the passages 33, 34
At the same time, the thinner and the air are discharged into the discharge passage 32 and mixed in the discharge passage 32 to form a swirling flow by the thinner and the air. The cleaning effect can be enhanced by intensively cleaning the paint adhered to the pipe wall and inner wall of the paint flow path including the paint regulator 6, the paint pipe 9, the trigger valve 10, the pump 14, and the like, and the cleaning time at the time of color change. In addition to improving the productivity by shortening the thickness, thinner is mixed with air and used, so that the amount of thinner required for cleaning can be reduced, and the cost for cleaning can be greatly reduced. .

In the above-described embodiment, the washing valve device 15 and the color changing valve device 1 are formed separately, and both are connected by the connection pipe 28. However, the present invention is not limited to this. For example, as in the modification shown in FIG. 5, the gate valve 3 and the connection pipe 28 may be eliminated and the discharge passage 32 of the cleaning valve device 15 may be directly mounted on the most upstream side of the manifold 2 '. In addition, the paint adhered to the complicated paint passage in the manifold 2 'can be more effectively washed by the swirling flow of thinner and air, and the painting apparatus itself can be made compact.

Further, in the above-described embodiment, the case where the hole diameter of the thinner passage 33 and the hole diameter of the air passage 34 are made the same is shown as an example.
May be formed to have a larger diameter than the air passage 34.

In the above-described embodiment, the case where the cleaning is performed using thinner is described as an example. However, in the case of a water-based paint, water can be used as the cleaning liquid.

Further, in the above embodiment, the cleaning valve device 15
Has been described as an example in which the present invention is applied to a coating apparatus having a rotary atomizing type electrostatic coating machine, but it is also applicable to other coating machines such as a hydraulic atomizing type coating machine and an air atomizing type coating machine. Widely applicable.

[0047]

As described above in detail, according to the present invention, it is extended tangentially along the outflow path for the cleaning liquid provided in the wash solution passage of the block body on the outer periphery of the ejection <br/> out passage , Said block
The outflow passage for air provided in the air passage of the
Outer circumference of the discharge passage so as to be parallel and opposite to the outflow passage
Along it is extended tangentially by Rukoto to simultaneously discharge the washing <br/> liquid and the air toward the discharge passage from the outlet <br/> passage and outflow passage of air for these washing liquid , since a configuration to form a swirling stream comprising the <br/> washing liquid and the air in said discharge exit passage, whereby the the swirling flow and it washes the air circulating paint flow path, turning Due to the centrifugal force at the time, the inner wall side of the paint flow path is positively circulated, and the paint adhered to the inner wall of the paint flow path can be effectively washed, thereby shortening the washing time and improving the productivity. In addition, since the cleaning liquid is mixed with air and used, the amount of cleaning liquid required for cleaning can be reduced, and the cost for cleaning can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a cleaning valve device according to an embodiment of the present invention, as viewed from the direction of arrows II in FIG.

FIG. 2 is a longitudinal sectional view showing a state where a thinner passage and an air passage in FIG. 1 are formed, as viewed from the direction of arrows II-II in FIG.

FIG. 3 is a longitudinal sectional view showing a turning state of thinner and air by enlarging a portion A in FIG. 2;

FIG. 4 is a time chart showing an operation state of the paint supply device according to the embodiment.

FIG. 5 shows a paint supply device according to a modification of the present invention.
It is a whole block diagram similar to.

FIG. 6 is an overall configuration diagram showing a conventional paint supply device.

7 is an enlarged longitudinal sectional view of the cleaning valve device in FIG. 6, as viewed from the direction of arrows VII-VII in FIG. 8;

FIG. 8 is a vertical sectional view showing a state where a thinner passage and an air passage in FIG. 7 are formed, as viewed from the direction of arrows VIII-VIII in FIG. 7;

FIG. 9 is a time chart showing an operation state of a conventional paint supply device.

[Explanation of symbols]

 2, 2 'manifold (paint channel) 6 paint regulator (paint channel) 9 paint pipe (paint channel) 10 trigger valve (paint channel) 14 pump (paint channel) 15 cleaning valve device 31 block body 32 discharge Passage 33 Thinner passage (washing liquid passage) 34 Air passage

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-261565 (JP, A) JP-B-47-21716 (JP, B1) JUN-63-37092 (JP, Y1) (58) Field (Int.Cl. ⁷ , DB name) B05B 5 / 08,7 / 04 B05B 7/26-7/32 B05C 11/10

Claims (1)

(57) [Claims] The method according to claim 1] discharge passage communicating with the upstream side of the paint passage
A, the block body and the air passage for discharging the cleaning liquid passage and the air for discharging a cleaning liquid to said discharge exit passage is provided,
A cleaning liquid valve connected to the cleaning liquid passage of the block body and controlling the flow of the cleaning liquid to the cleaning liquid passage; and an air valve connected to the air passage of the block main body and controlling the flow of air to the air passage. in the paint flow path cleaning valve device comprising, the discharge passage to the cleaning solution passage before Symbol block body
An outflow channel for the cleaning liquid that extends tangentially along the circumference of the
And an air passage for the cleaning liquid is provided in the air passage of the block body.
Outer circumference of the discharge passage so as to be parallel and opposite to the outlet
Along the outlet channel for the air that is elongated in the tangential direction is provided, and the outflow path and the outflow path for air for the cleaning liquid, said discharge passage
Paint flow channel flush valve device being characterized in that a configuration which forms a swirling flow comprising a washing liquid and the air more said discharge exit passage to Rukoto to discharge the cleaning liquid and the air simultaneously toward the inside.