JPH06304504A - Color change painting valve - Google Patents

Abstract

(57) [Abstract] [Purpose] In addition to shortening the cleaning time and changing the amount of cleaning liquid used when changing colors, prevent paint from remaining and prevent color mixing. [Constitution] Color change painting valves V _{1 to} V ₃ connected in series
Is the interior of the valve housing 1 having a paint inlet port 19 and a paint return port 20 connected to a paint tank, a paint outlet port 25 connected to a spray gun, and a cleaning liquid inlet port 26 connected to a cleaning liquid tank. To
A valve body assembly 10 that is rotated 90 ° by a rotary actuator 18 is provided. In the valve body assembly 10, a first passage 32 that communicates the paint inlet port 19 and the paint return port 20 with a second passage 33 that communicates the cleaning liquid inlet port 26 and the paint outlet port 25.
And a third passage 34 that connects the paint inlet port 19 and the paint outlet port 25 are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a valve housing having a paint inlet port, a paint return port, a paint outlet port, and a cleaning liquid inlet port, which is connected to an actuator inside the valve housing. The present invention relates to a color change coating valve provided with a valve body that rotates between a first rotation position and a second rotation position.

[0002]

2. Description of the Related Art For example, as a color changing coating device for coating a vehicle body flowing through a coating line of an automobile with different coating colors, there is known one described in Japanese Utility Model Laid-Open No. 61-91348. In this color change coating device, a plurality of color change valves provided on a common manifold are connected to a plurality of paint tanks containing paints having different paint colors, and the desired color is obtained by selectively opening the color change valves. Color paint is supplied from the paint tank through the manifold to the spray gun. At the time of color change after the prescribed paint color is finished, open the valve connected to the cleaning liquid tank to clean the path from the inside of the manifold to the spray gun with the cleaning liquid, and then switch another color changing valve. When released, the next paint color starts to be painted.

[0003]

However, in the above-mentioned conventional color changing coating apparatus, when the predetermined color changing valve is opened for painting, the paint spreads inside the manifold to all the color changing valves. Will adhere to the vicinity of the outlet. Therefore, a large amount of cleaning liquid is required to clean the inside of the manifold, and there is a problem that a lot of time is required for cleaning. Further, it is difficult to completely clean the vicinity of the outlets of all the color change valves, and there is a problem that the paint of the previous color remains and color mixing occurs.

The present invention has been made in view of the above circumstances, and it is possible to save the cleaning liquid and the time required for cleaning at the time of color change, and prevent the paint of the previous color from remaining to avoid the occurrence of color mixture. With the goal.

[0005]

In order to achieve the above object, the present invention provides a paint inlet port, a paint return port, and
A color including a valve housing having a paint outlet port and a cleaning liquid inlet port, and a valve body connected to the actuator and rotating between a first rotation position and a second rotation position inside the valve housing. A replacement painting valve, wherein the valve body has a first passage for communicating the paint inlet port with the paint return port and a second passage for communicating the cleaning liquid inlet port with the paint outlet port in the first rotation position.
A passage and a third passage for communicating the paint inlet port with the paint outlet port at the second rotation position, and one adjacent valve housing when a plurality of valve housings are connected in series. The paint outlet port can be connected to the cleaning liquid inlet port of the other valve housing.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 5 show an embodiment of the present invention. FIG. 1 is a vertical sectional view of a color change coating apparatus, and FIG.
2 is a cross-sectional view taken along line 2, FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 1, FIG. 4 is a view showing a state during cleaning, and FIG. 5 is a view showing a state during coating with another color.

As shown in FIGS. 1 to 3, a plurality of color changing coating devices for selectively supplying paints of a plurality of colors to a spray gun are provided with substantially the same structure (three in the embodiment). The color change coating valves V _{1 to} V ₃ are connected in series. Less than,
The structure of the color change coating valve V ₁ will be described as an example.

The color change coating valve V ₁ is provided with an outer valve housing 1 having a substantially rectangular column shape. The accommodation hole 1 ₁ extending through the outer valve housing 1 vertically, a first inner valve housing 2 and the second inner valve housing 3 is housed across the spacer 4, the lower surface of the second inner valve housing 3 Nut 5 screwed into storage hole 1 ₁
While being supported by the top surface of the first inner valve housing 2 is supported by a nut 9 which is screwed into the housing holes 1 ₁ across the pair of ground color 6,7 and gland seal 8.

The valve body assembly 10 includes a spherical first valve body 11 rotatably housed in the first inner valve housing 2 and a spherical second valve body 11 rotatably housed in the second inner valve housing 3. The valve body 12 is integrally connected via a connecting shaft 13 and a nut 14. The drive shaft 15 formed integrally with the first valve body 11 penetrates through the gland seal 8 and the nut 9 and extends upward, and is attached to the outer valve housing 1.
It is connected to a rotary actuator 18 supported by a bracket 17 fixed with book bolts 16, 16. Therefore, by driving the rotary actuator 18, the valve body assembly 10 is moved to the first rotation position (the state of the color change painting valves V ₁ and V ₂ of FIG. 1) and the second rotation position (the color change painting valve of FIG. 1). It is driven reciprocally rotated over V ₃ states) between the to 90 °.

As is apparent from FIG. 2, a paint inlet port 19 and a paint return port 20 are formed on the left and right side surfaces of the outer valve housing 1 and the first inner valve housing 2 so as to face each other. Paint inlet port 1
9 is connected to a paint tank 22 and a paint supply pump 23 via a paint supply pipe 21 and is connected to a paint return port 20.
Is connected to the paint tank 22 via a paint return line 24.

As is apparent from FIG. 3, the paint outlet port 25 and the cleaning liquid inlet port 26 are provided on both front and rear side surfaces of the outer valve housing 1 and the second inner valve housing 3.
And are formed so as to face each other. When the color change painting valves V _{1 to} V ₃ are connected in series in the front-rear direction and integrated with a bolt (not shown), the color change painting valves V ₁ to V ₃ adjacent to each other are connected.
The V ₃ paint outlet port 25 and the cleaning liquid inlet port 26 communicate with each other. The paint outlet port 25 of the color change coating valve V ₃ located on the downstream end side is connected to the spray gun 28 via the paint supply line 27, and the paint change port V ₃ of the color change painting valve V ₁ located on the upstream end side is connected. Cleaning liquid inlet port 26
Is the cleaning liquid supply pump 30 via the cleaning liquid supply line 29.
And the cleaning liquid tank 31.

A first passage 32 is formed in the first valve body 11 so as to be bent in a V shape, and when the valve body assembly 10 is in the first rotation position, the first passage 32 is formed.
The paint inlet port 19 and the paint return port 20 communicate with each other via the. Further, the second valve body 12 is formed with a second passage 33 that bends in a V shape, and when the valve body assembly 10 is in the first rotation position, the paint outlet port 25 is provided through the second passage 33. And cleaning liquid inlet port 2
6 communicates with. Further, the first valve body 11, the connecting shaft 13, and the second valve body 12 are formed with a third passage 34 composed of a horizontal hole 34 ₁ , a vertical hole 34 ₂ and a horizontal hole 34 _3. Is in the second rotation position, the paint inlet port 19 and the paint outlet port 25 communicate with each other through the third passage 34.

Next, the operation of the embodiment of the present invention having the above construction will be described.

For example, when the paint in the paint tank 22 connected to the _third color change painting valve V ₃ is supplied to the spray gun 28, the first color change painting valves V ₁ and 2 are supplied.
Valve body assembly 1 of th color-changing paint valve V ₂
0 is left in the illustrated first rotation position, and the rotary actuator 18 is driven to switch the valve body assembly 10 of the _third color change coating valve V ₃ to the illustrated second rotation position.

As a result, the paint drawn up by the paint supply pump 23 from the paint tank 22 connected to the _third color change painting valve V ₃ is transferred from the paint supply line 21 to the third color change painting valve V ₃ . A third passage 34, which is supplied to the paint inlet port 19 and is formed in the valve body assembly 10, from which the horizontal hole 34 is formed in the first valve body 11.
₁ , through the vertical hole 34 ₂ formed in the connecting shaft 13 and the horizontal hole 34 ₃ formed in the second valve body 12 to reach the paint outlet port 25, and then from there through the paint supply line 27 to the spray gun 28. Is sprayed.

At this time, the paint drawn up by the paint supply pump 23 from the paint tank 22 connected to the _first color change painting valve V ₁ and the second color change painting valve V ₂ is
From the paint inlet port 19 to the paint return port 20 through the first passage 32 formed in the first valve body 11 at the first rotation position, the paint returns to the paint tank 22 via the paint return pipe line 24. In this way, by circulating the paint of the paint color that is not currently sprayed from the spray gun 28 by the paint supply pump 23, the hardening of the paint is prevented.

Further, the cleaning liquid inlet port 26 of the first color changing coating valve V ₁ connected to the cleaning liquid tank 31 has a first color changing coating valve V ₁ and a second color changing coating valve V _2.
Through the second passage 33 of the second valve body 12 in the first rotation position of the third color change coating valve V ₃ communicating with the cleaning liquid inlet port 26.
Is blocked by the second valve body 12 in the second rotation position of the _third color-changing coating valve V ₃ , and the communication to the paint outlet port 25 is blocked.

Third color change coating valve V₃Painting with
When cleaning is completed and the color is changed,
As shown in Fig. 4, to wash the paint remaining in the distribution channel
In addition, the 3rd color change coating bar that was in the 2nd rotation position until then
Rub V₃The valve body assembly 10 of the first rotation position
Switch to. As a result, the third color change coating valve V ₃
Of the paint inlet port 19 of the first valve body 11
The paint is connected to the paint return port 20 through the passage 32, and the paint is sprayed.
The paint supply line 21 without being supplied to the spray gun 28
And a paint return line 24.

On the other hand, by switching the _third color-changing coating valve V ₃ , the cleaning liquid inlet port 26 and the coating material outlet port 25, which have been prevented from communicating with each other, through the second passage 33 of the second valve body 12. Communicate. As a result, the cleaning liquid pumped from the cleaning liquid tank 31 by the cleaning liquid supply pump 31 passes from the cleaning liquid inlet port 26 of the _first color change coating valve V ₁ to the paint outlet port 25 of the _third color change coating valve V _3. And then paint supply line 2
7. Clean the path to 7 and the spray gun 28. At this time, the cleaning liquid inlet port 2 of the _first color change coating valve V ₁
Since no paint is attached to the path from the sixth to third color change coating valve V _{3 to} the cleaning liquid inlet port 26, it is possible to shorten the cleaning work time and save the cleaning liquid, and to prevent the residual paint. It is possible to prevent the occurrence of color mixture.

When the previous color paint is washed as described above, as shown in FIG. 5, for example, the valve body assembly 10 of the _second color change coating valve V ₂ is moved from the first rotation position to the second rotation position. Can be switched to. As a result, the second color changing paint pumped paint Valve V ₂ paint supply pump 23 from the connected paint tank 22, from the paint supply line 21 of the second color changing paint valve V ₂ paint inlet port 19 to the valve body assembly 10
To the paint outlet port 25 via the third passage 34 formed in the above, and further, from the cleaning liquid inlet port 26, the second passage 33 and the paint outlet port 25 of the third color change coating valve V ₃ to the paint supply pipe 27. And is sprayed from the spray gun 28.

At this time, from the cleaning liquid inlet port 26 of the _first color change painting valve V ₁ to the second color change painting valve V ₂
Since there is no paint on the path to the cleaning liquid inlet port 26 of No. 1, when the valve body assembly 10 of the _second color change coating valve V ₂ is returned to the first rotation position and cleaning with the cleaning liquid is performed, ~ 3rd color change painting valve V
_The cleaning time and the cleaning solution can be saved as compared with the case of cleaning all of _{1 to} V ₃ .

Further, since a predetermined number of color changing coating valves V ₁ to can be used in combination in accordance with the number of required coating colors, the size and cost of the color changing coating device can be minimized. it can.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-mentioned embodiments, and various design changes can be made.

For example, in the embodiment, three color-changing coating valves V _{1 to} V ₃ are connected and used, but the number of connected valves can be appropriately changed. Further, the color-changing paint valve of the present invention can be used for any purpose other than the painting of automobile bodies.

[0026]

As described above, according to the present invention, when the paint is supplied from the paint inlet port of a predetermined color change painting valve among the plurality of color change painting valves connected in series, the paint is supplied to the downstream end. Since it is discharged from the paint outlet port of the color change painting valve, the paint does not adhere to the color change painting valve upstream of the predetermined color change painting valve. Therefore,
At the time of color change, when washing the flow path of the paint with the washing liquid, it is sufficient to wash only the color change painting valve on the downstream side of the predetermined color change painting valve, and moreover, the entire amount of the washing liquid supplied is the color to which the paint is attached. Since it passes through the replacement coating valve, the cleaning time can be shortened, the cleaning liquid can be saved, and the residual paint can be prevented. In addition, since the required number of color change painting valves can be connected and used, the color change painting apparatus can be made compact and the cost can be reduced.

[Brief description of drawings]

[Figure 1] Vertical cross-sectional view of color change coating device

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a diagram showing a state during cleaning.

FIG. 5 is a diagram showing a state when another color is applied.

[Explanation of symbols]

1 Outer Valve Housing (Valve Housing) 10 Valve Body Assembly (Valve Body) 18 Rotary Actuator (Actuator) 19 Paint Inlet Port 20 Paint Return Port 25 Paint Outlet Port 26 Cleaning Liquid Inlet Port 32 First Passage 33 Second Passage 34 Third Passage

Claims (1)

[Claims] 1. A valve housing (1) having a paint inlet port (19), a paint return port (20), a paint outlet port (25) and a cleaning liquid inlet port (26).
And a valve body (10) which is connected to an actuator (18) and rotates between a first rotation position and a second rotation position inside the valve housing (1). Then, in the valve body (10), the first passage (32) for communicating the paint inlet port (19) with the paint return port (20) and the cleaning liquid inlet port (26) in the first rotation position are connected to the paint outlet port (25). A second passageway (33) communicating with the paint passage port is formed, and a third passageway (34) communicating the paint inlet port (19) with the paint outlet port (25) is formed at the second rotation position, and a plurality of them are formed. When the valve housings (1) of (1) are connected in series, the paint outlet port (25) of one adjacent valve housing (1) is connected to the cleaning liquid inlet port (25) of the other valve housing (1). 26) A color change painting valve, which is connectable to 26).