JPH051330Y2 - - Google Patents

Description

[Detailed explanation of the idea]

"Field of Industrial Application" The present invention relates to a paint mixing valve used for painting the body of a vehicle. "Conventional technology" Conventional three-way valves for paints have one valve for each paint.
As shown in Fig. 4, when the air signal to the pilot air inlet 1 is turned off, the flow path 4 from the paint inlet 2 to the paint return port 3 is opened to allow the paint 5 to flow into the primary side. It has two functions: a circulation function that performs circulation to prevent the pigment contained in the paint 5 from settling, and a discharge function that discharges the paint 5 to the paint outlet 6 when the air signal to the pilot air inlet 1 is turned on. It was something that had only one thing. In recent years, the present inventor has confirmed that painting with a low-viscosity paint is effective as one means for improving the high smoothness of the coated surface, which has been required to be of high quality. On the other hand, if the entire vehicle body is simply painted with a low-viscosity paint, the opposite problem of paint sagging may occur depending on the painted area. Paint sag is also affected by the shape of the car body, paint material, diluent, and booth temperature. Currently, one three-way valve is used for each paint of any color, and the paint viscosity is also fixed, so in order to obtain the high smoothness of the painted surface as described above, Measures have been taken to deal with this by changing the amount of spray applied to each area to be painted or optimizing the spraying interval, but this is not sufficient and there is a problem of large variations in smoothness depending on the area within the car body. It was hot. ``Problem that the invention attempts to solve'' This invention was made to solve the above problem, and it is possible to apply low-viscosity paint and high-viscosity paint to each part of the painting area by applying paint with any desired color. 1
An object of the present invention is to provide a paint mixing valve that can be implemented using a separate valve. ``Means for Solving the Problems'' According to the present invention, there is a paint inlet into which paint flows, a paint return port which returns paint to the primary side,
and a valve having a first flow path from the paint inlet to the paint return port in the valve body, the diluent inlet into which the diluent is introduced, the mixing chamber in which the diluent and the paint are mixed, and the diluent mixed from the diluent inlet. a second flow path leading to the mixing chamber, a third flow path leading from the mixing chamber to the mixed paint outlet, and a fourth flow path leading from the paint inlet to the mixing chamber, and from the paint inlet to the mixing chamber; A fourth flow path leading to the mixing chamber and a first flow path leading from the paint inlet to the paint return port are linearly arranged in the valve body,
A paint needle valve is provided to open and close these fourth and first flow paths reciprocally, and a second flow path from the diluent inlet to the mixing chamber is provided with a paint needle valve. Equipped with a needle valve for diluent that opens and closes.
This needle valve for diluent is used only when the needle valve for paint opens the fourth flow path leading from the paint inlet to the mixing chamber.
A paint mixing valve is provided, characterized in that it is configured to open a flow path. "Function" According to the above configuration, the paint discharge function and the paint circulation function are respectively performed by opening and closing the first needle valve, and only when the first needle valve is opened and paint is discharged, the second needle valve is opened and closed. The needle valve is operated to mix the diluent into the paint, so the three functions of dispensing high viscosity paint, dispensing low viscosity paint, and circulating paint are performed by one valve. ``Example'' Next, an example of the present invention will be described with reference to FIGS. 1 to 3. The valve body 7 is provided with a pilot air inlet 1, a paint inlet 2, a paint return port 3, and a paint outlet 6, and a flow path 4 leading from the paint inlet 2 to the paint return port 3.
A paint needle valve 8 is disposed at . The valve body 7 includes a diluent inlet 9 into which the diluent 10 is introduced, and a mixing chamber 11 in which the diluent 10 and the paint 5 are mixed.
is provided. Further, as shown in FIG. 3, the valve body 7 includes a flow path 12 from the diluent inlet 9 to the mixing chamber 11, a flow path 13 from the mixing chamber 11 to the paint outlet 6, and a flow path 13 from the paint inlet 2 to the mixing chamber. 11 is provided. A flow path 14 leading from the paint inlet 2 to the mixing chamber 11;
The flow path 4 leading from the paint inlet 2 to the paint return port 3 is as follows:
They are arranged linearly in the valve body 7. Then, as shown in FIG.
Paint needle valve 8 to open and close 4 reciprocally.
Conical valves 81 and 82 are formed at the intermediate portion and lower end, and valve seats 71 and 72 are formed on the valve body 7. A diluent needle valve 15 for opening and closing the flow path 12 is disposed in the flow path 12 leading from the diluent inlet 9 to the mixing chamber 11, and a conical valve 151 is provided at the lower end of the diluent needle valve 15. is formed.
Furthermore, a valve seat 73 is formed on the valve body 7, as shown in FIG. As shown in FIG. 2, a housing 16 is fixedly installed above the valve body 7, and two independent paint needle valves 8 and a diluent needle valve 15 are slid into the housing 16. A movably connected pressure receiving plate 17 is arranged to be movable up and down. The pressure receiving plate 17 is connected to the pilot air inlet 1
It is pushed up by pressurized air introduced into the air. A push plate 18 is attached to the upper end of the paint needle valve 8.
is fixed, and a compression spring 19 having relatively high elasticity is disposed between the upper surface of the pressure receiving plate 17 and the lower surface of the pushing plate 18.
A compression spring 20 having relatively low elasticity is disposed between the upper surface of the housing 16 and the inner surface of the housing 16. Further, a push plate 21 is fixed to the upper end of the diluent needle valve 15, and this push plate 21
A compression spring 22 is also disposed between the upper surface of the housing 16 and the inner surface of the housing 16. Housing 16
A shoulder portion 23 is provided on the upper part of the push plate 18 and 21 to limit upward movement of the push plates 18 and 21. A connecting plate 24 in which a mixing chamber 11 is formed is connected to the lower part of the valve body 7.
A manifold plate 25 in which the flow path 13 has a spiral structure is joined to the lower part of the manifold plate 4 . “Operation” In the above configuration, under normal conditions, pressure air is not supplied to the pilot air inlet 1, so the first
As shown in the figure, the pressure receiving plate 17 is pressed by compression springs 19, 20, and 22 and is in contact with the upper surface of the valve body 7. The paint needle valve 8 and the diluent needle valve 15 are connected to a compression spring 2
0 and 22, and the conical valves 82 and 151 close the valve seats 72 and 73.
Therefore, the paint 5 enters the valve body 7 through the paint inlet 2, flows through the flow path, and enters the tank 30 through the paint return port 3.
It flows through a circular path where it is returned to. Diluent 10
Also, the conical valve 151 of the diluent needle valve 15,
The valve body 7 is sealed by closing with the valve seat 73, and the paint is not discharged from the paint outlet 6. When painting parts of the car body that have relatively complex shapes and are difficult to prevent paint from dripping, such as door edges, pillars, press lines, etc., only paint adjusted to a slightly higher viscosity is used, and diluent is used. is not used.
In this case, as shown in FIG.
Low pressure air of Kg/cm ² is supplied to the pilot air inlet 1, and the pressure receiving plate 17 is pushed upward by the low pressure air, so the paint needle valve 8 is pushed upward via the compression spring 19 and the push plate 18. It will be done. Conical valve 8 of needle valve 8 for paint
1 is closed to the valve seat 71, and the conical valve 82 is closed to the valve seat 72.
In order to release the paint 5, the paint 5 is discharged from the paint outlet 6. In this case, since only low pressure air is supplied to the pilot air inlet 1, the push plate 21 on the diluent side, the compression spring 22, and the diluent needle valve 15 are not operated. Next, when painting general surfaces of the car body, such as the center of the door or the horizontal surface of the car body, which have a relatively gentle shape and are easily noticeable, and where quality is important, it is necessary to mix a diluent with a high viscosity paint. This results in a low viscosity paint. In this case, as shown in FIG. 3, high pressure air of about 4 to 5 kg/cm ² is supplied to the pilot air inlet 1, so the pressure receiving plate 17 moves upward while compressing the compression springs 19 and 22. The needle valve 8 for paint and the needle valve 15 for diluent are moved upward by being pushed up forcefully. Then, a flow path 14 on the paint side and a flow path 1 on the diluent side.
2 are both opened, and the paint 5 and diluent 10 flow into the mixing chamber 11 from independent channels 14 and 12, but due to the spiral structure inside the channel 13, the paint 5 and diluent 10 are The mixture is uniformly mixed before being discharged from the outlet 6, and then discharged from the tip of the painting gun 32. The above operations can be summarized as shown in Table 1 below.

[Table] As shown in Table 1, high pressure air does not cause only the diluent to be discharged. "Effects" As described above, since the paint mixing valve of the present invention has the above configuration, it can apply one coat of low-viscosity paint and one high-viscosity paint to each coating area, one for each paint of any color. It is safe because only the diluent is not discharged, and when not painting, the paint can be circulated between the tank and the valve, and the structure is simple. It has excellent effects such as

[Brief explanation of the drawing]

1 to 3 show the structure and operation of a paint mixing valve according to an embodiment of the present invention, FIG. 1 is a sectional view showing the state when low pressure air and high pressure air are off, and FIG. FIG. 3 is a sectional view showing the state when high pressure air is on, and FIG. 4 is a sectional view showing the conventional painting valve. 2...Paint inlet, 3...Paint return port, 4,1
2, 13, 14...flow path, 5...paint, 6...paint outlet, 7...valve body, 8...paint needle valve,
9... Diluent inlet, 10... Diluent, 11... Mixing chamber, 15... Diluent needle valve.

Claims (1)

[Scope of Claim for Utility Model Registration] A valve that is equipped with a paint inlet through which paint flows, a paint return port that returns the paint to the primary side of the inlet, and a first flow path from the paint inlet to the paint return port. a diluent inlet into which the diluent is introduced, a mixing chamber in which the diluent and the paint are mixed, a second flow path from the diluent inlet to the mixing chamber, a third flow path from the mixing chamber to the paint outlet, and A fourth flow path from the paint inlet to the mixing chamber is provided in the valve body, and a fourth flow path from the paint inlet to the mixing chamber;
A first flow path from the paint inlet to the paint return port is linearly arranged on the valve body, and a paint needle valve is provided that opens and closes the fourth and first flow paths reciprocally. In addition, a needle valve for the diluent that opens and closes the second flow path is disposed in the second flow path leading from the diluent inlet to the mixing chamber, and the needle valve for the diluent is arranged to open and close the second flow path. A paint mixing valve characterized in that the needle valve is configured to open the second flow path from the diluent inlet to the mixing chamber only when the fourth flow path from the paint inlet to the mixing chamber is opened. .