JPS5857978B2 - Paint circulation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paint circulation system for spray painting, and its purpose is to recirculate paint fed to a spray gun into a paint tank when painting work is interrupted for a long time, and to constantly keep the paint flowing. In order to prevent the paint from stopping or settling in the paint hose when it is in a fluid state, it is possible to connect the paint hose to the spray gun with a single paint hose, simplifying the spray gun hand and improving work efficiency. It is.

Generally, in spray painting, a paint hose that connects to a spray gun is connected to a pipe that is piped from a paint tank to a painting workshop and returns to the paint tank.

In this case, even if there is a spray gun that has stopped painting for a long time, other spray guns are in use, so the pipe must constantly pump paint.

Therefore, paint remains under pressure in the paint hose of the spray gun whose work is suspended.

As a result, the paint settles in the paint hose, and when the spray gun is used again, the spray gun must be blown dry to remove the sediment in the paint hose. Otherwise, spots will appear on the painted surface.

In order to solve this problem, a means has been developed to return the paint pumped into the paint hose of the spray gun whose operation is suspended to the return line to the tank.

This means is provided with a main circulation pipe and a return pipe for the paint, and two hoses, a paint supply hose and a return hose, are connected to the spray gun, and these two hoses are connected to the main circulation pipe. and a return line, respectively.

In this case, since two hoses are connected to the spray gun, the weight increases when holding the spray gun, and this also hinders smooth and nimble movement, which has a negative impact on work efficiency. there were.

The present invention was developed to solve these conventional problems, and its feature is that a single paint hose is used to feed paint to the spray gun and to provide circulating flow during work interruptions. be.

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

In FIG. 1, numeral 1 denotes a paint tank, and 2 denotes a high-pressure main circulation pipe that circulates the paint pumped from the paint tank 1 by a pump P through the painting workshop and back into the paint tank 1.

A paint return pipe 3 is connected to the main circulation pipe 2 via a pressure regulating valve 4 and reaches the paint tank 1.

The paint flowing through the paint return pipe 3 is set at a pressure level lower than the paint feeding pressure flowing through the main circulation pipe 2 by a pressure regulating valve 4.

Further, as shown in FIG. 2, a feed branch pipe 6 having a pressure regulating valve 7 is connected to the main circulation pipe 2.

Any plurality of these feeding branch pipes 6 are connected to the main circulation pipe 2 at required intervals.

On the other hand, a return branch pipe 9 is connected to the paint return pipe line 3 in close proximity to and parallel to the feed branch pipe 6.

One end of this return branch pipe 9 is equipped with a joint 10, a stop valve 13, and a check valve 5.

Further, one paint hose 8 is connected to one end of the feed branch pipe 6 via a stop valve 13 .

At the tip of the paint hose 8, a spray gun 11 and a joint 12 which is detachable from the joint 10 at one end of the return branch pipe 9 are attached.

Since the present invention is constructed as described above, the paint in the paint tank 1 is pumped through the main circulation pipe 2 at a high pressure level by the pump P, and is recycled back into the paint tank 1.

The water is also diverted to the feed branch pipe 6 between them.

In the case of spray painting work, one end of the paint hose 8 connected to the feed branch pipe 6 is connected to a spray gun 11 as shown by the solid line in the figure.

At this time, internal pressure is applied to the check valve 5 on the return branch pipe 9 side, resulting in a closed state.

Therefore, paint is fed to the spray gun 11 at a pressure suitable for spray painting by the pressure regulating valve 7 provided in the feed branch pipe 6, and normal spray painting is performed.

Now, if you want to interrupt painting work for a long time, use the paint hose 8.
Remove the joint 12 from the spray gun 11 and connect it to the joint 10 at one end of the return branch pipe 9.

The paint adjusted to the return pressure by the pressure regulating valve 7 flows from the feed branch pipe 6 through the paint hose 8 to the return branch pipe 9, and after opening the check valve 5, the paint returns from the paint return pipe 3 to the paint tank. It is a ring element to 1.

In this way, in the present invention, when painting work is interrupted, the spray gun and one paint hose that can be attached and detached are connected to the return branch pipe and returned to the paint tank through the paint phase return pipe, so that there is no need to interrupt the work. The paint is always flowing in the paint hose even when the spray gun is in use, which prevents the problem of sedimentation caused by stagnation of the paint, and since the spray gun only has one paint hose at hand, it is lightweight and the work is smooth and light. It will be done.

Furthermore, it has advantages such as being more economical than a two-piece type hose.

[Brief explanation of the drawing]

FIG. 1 is a piping diagram of the apparatus of the present invention, and FIG. 2 is a piping diagram of the main parts thereof. 1...Paint tank, 2...Main circulation pipe, 3...Paint return pipe, 4...Pressure regulating valve, 6... ...Feeding branch pipe, 7...Pressure regulating valve, 8...Paint hose, 9...Return branch pipe, 10...Joint, 11.・・・・・・
Spray gun, 12...joint.

Claims (1)

[Claims] 1. A high-pressure main circulation pipe that returns the paint pumped from the paint tank back to the paint tank, and a low-pressure paint return branch that branches from the main circulation pipe via a pressure regulating valve to the paint tank. A plurality of feeding branch pipes having pressure regulating valves are connected to the main circulation pipe at required intervals, and the paint return pipe has a plurality of feeding branch pipes having pressure regulating valves connected thereto at required intervals. A paint circulation device for painting, characterized in that a return branch pipe is connected, a spray gun is detachably connected to the feed branch pipe, and a single detachable paint hose is connected to the return branch pipe. .