JPS5853578B2 - powder coating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a powder coating apparatus that allows the amount of powder sprayed to be easily adjusted during powder coating work.

Conventionally, in powder coating equipment that includes a mechanism for transporting and adjusting paint using compressed air, the spray amount adjustment mechanism (generally adjusted by a pressure reducing valve) and painting gun are provided independently. Therefore, when it becomes necessary to adjust the spray amount during a painting operation, the painting operation must be temporarily stopped and the spray amount adjusted.

Particularly in a painting line, the above-mentioned adjustment must be performed after the line is stopped, resulting in a large loss of man-hours.

The present invention has been made to overcome the drawbacks of the prior art.

That is, the present invention provides a powder coating device that can be easily adjusted by disposing a mechanism that can adjust the spray amount at the coating can.

The present invention provides an air passage for transporting paint and an air passage for adjusting paint in the ejector pump, and adjusts the amount of paint ejected by the ratio of the air amounts sent to both passages, and by the sum of the air amounts sent to both passages. Using an ordinary powder coating device equipped with a mechanism that determines the paint ejection speed, a portion of this compressed air for transportation is sent to the paint adjustment air in the ejector pump through an air volume adjustment device installed near the painting gun. It is arranged so that the water branches into the passage.

Hereinafter, the present invention will be explained with reference to drawings of embodiments.

Reference numeral 1 denotes a powder supply tank, and an ejector pump 2 is installed at the bottom of the tank.The ejector pump 2 has an air passage 2a for transporting paint and an air passage 2b for adjusting paint at one end of the valve chamber. It becomes.

3 is a compressor, and a part of this compressed air is sent to the paint conveying air passage 2 through a branch hose I branched from a pressure reducing valve 4.
At the same time, the tip of another branch hose 8 branched from the pressure reducing valve 4 is connected to the air volume adjustment device 6 attached to the painting gun 50, and the air hose 8' is connected to the air volume adjustment mechanism 6. The air is branched and flows into the paint adjusting air passage 2b through the air passage 2b.

If the total amount of air (paint jetting speed) sent from the pressure reducing valve 4 to the painting gun 5 through both air passages 2a and 2b in the ejector pump 2 is adjusted, a constant paint jetting speed can be maintained. Furthermore, the amount of paint sprayed can be easily adjusted even during painting work.

That is, by opening the air amount adjusting device 6 provided at the hand of the painting gun 50, the amount of air sent to the paint conveying air passage 2a is reduced, and the amount of air sent to the paint adjusting air passage 2b is reduced accordingly. Since this increases, the amount of paint ejected can be reduced while maintaining a constant paint ejection speed.

Moreover, by performing the operation opposite to the above, the amount of paint ejected can be increased.

FIG. 2 shows another embodiment, which shows a painting gun 5.
This is a simplified version of the type with two air hoses as in the previous embodiment, with only one air hose leading to the hand.

That is, in this case, two pressure reducing valves 4 connected to the compressor 3 are installed independently, and the branch hose 7 connected to one of the pressure reducing valves 4 is connected to the paint conveying air passage 2a of the ejector pump 2, and A branch hose 8 is connected to an air volume regulating device 6 disposed on the painting gun 5, and an outlet of the air volume regulating device 6 faces the outside and releases compressed air into the atmosphere. It is.

On the other hand, the air hose 8' connected to the other branched independent pressure reducing valve 4 is directly connected to the paint adjusting air passage 2b.

To adjust the paint at this time, by opening the air amount adjusting device 6 provided near the painting gun 50, a part of the air for transporting the paint escapes into the atmosphere, reducing the amount of paint sprayed out.

Moreover, the amount of paint ejected can be increased by performing the reverse operation.

In this case, the total amount of air sent to the painting gun 5, that is, the paint jetting speed, is reduced by the amount of air escaping to the atmosphere, so it is suitable for use with an apparatus in which slight fluctuations in the paint jetting speed can be ignored. be.

As mentioned above, the present invention (by providing an air volume adjustment device at the hand of the painting gun, it is possible to easily adjust the amount of paint jetted during painting work, and to maintain a constant paint jetting speed while maintaining the amount of paint sprayed). This has the effect of making it possible to adjust the ejection amount and making the gun easier to handle.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, with FIG. 1 being a side view showing the main parts, and FIG. 2 being a side view showing another embodiment. 1...--Powder supply tank, 2... Ejector pump, 2a... Air passage for transporting the same paint, 2
b...---Air passage for adjusting the same paint, 3...---
-Compressor, 4...--Reducing valve, 5--Painting gun, 6--Air amount adjustment device.

Claims (1)

[Claims] 1. In a powder coating device that transports paint using compressed air and adjusts the amount of paint transported by adjusting the amount of compressed air to an ejector pump, the air passage for transporting the paint is branched. A powder coating apparatus, characterized in that an air amount adjustment device is connected to the powder coating device, and the air amount adjustment device is installed in a coating gun. 2. The powder coating apparatus according to claim 1, wherein the outlet side passage of the air amount adjustment device is connected to the paint adjustment air passage of the ejector pump. 3. The powder coating apparatus according to claim 1, wherein the outlet side passage of the air amount adjusting device is opened to the atmosphere.