JPH0624743Y2 - Remaining amount detector of paint tank - Google Patents

Description

TECHNICAL FIELD The present invention relates to a device for detecting when the amount of paint remaining in a paint tank falls below a certain amount.

Problems to be Solved by Conventional Techniques and Inventions Generally, in a paint device, a saxion hose connected to a paint pump is immersed in paint in a paint tank so that its suction port faces the bottom of the paint tank. It is designed to suck up the paint by driving the paint pump and send it under pressure to the spray gun to apply it to the object to be painted, and when the liquid level drops below the suction port of the suction hose, the air is sucked up. Since normal coating becomes impossible, it is necessary to have a means for detecting when the remaining amount of the paint is below a certain amount.
The filled paint can is used as a paint tank by inserting a suction hose through the opening on the top surface, and when the paint runs out, it is often replaced with a new paint can.In this case, the remaining amount of paint is detected. Since it is difficult to attach the device to the paint can, it is said that if you lift the paint can by hand and estimate the remaining amount with its weight,
It was extremely inefficient.

Means for Solving the Problems The present invention, as means for solving the above problems,
A mounting table for mounting a paint tank connected via a suction hose to a paint pump that pumps the paint to the spray gun is supported up and down along a vertical guide, and the mounting table is urged in an ascending direction. An air cylinder is installed, and a pressure adjustment valve is installed in the pressurized air supply pipe of the air cylinder, and the secondary pressure of the pressure adjustment valve is set so that the amount of paint remaining in the paint tank on the mounting table is below a certain level. In this case, the air cylinder sets the pressure to raise the mounting table together with the paint tank.

Operation and effect The present invention has the above-mentioned configuration, and when the amount of paint in the paint tank is large, the total weight of the paint, the paint tank, and the mounting table overcomes the bias of the air cylinder, and the lift table is positioned at the lower end of the guide. It is located, and as the paint in the paint tank is sucked up by the paint pump and ejected from the spray gun, the remaining amount of paint gradually decreases and the weight of the paint acting on the mounting table becomes smaller. If the total weight of the paint, the paint tank, and the mounting table is reduced to a predetermined weight by the liquid level of the paint approaching the bottom of the paint tank and descending to a position slightly above the suction port of the suction hose, Since the urging force of the air cylinder overcomes the weight and the mounting table rises, you can visually check this and install a detection device such as a proximity switch to check the signal output from this. By inputting to the warning device and emitting a warning sound or turning on a warning lamp, an operator can stop the spraying of the spray gun paint and the drive of the paint pump at a good break before painting failure occurs. Alternatively, by inputting a signal to the control device, it is possible to automatically stop the spray of paint and the drive of the paint pump at a good break point. After pulling out the suction hose from the paint tank, you can unload it from the mounting table, place a new paint tank on the mounting table and insert the saxion hose, or just supply the paint to the paint tank. After the paint tank is replaced or the paint is replenished, the weight is increased and the mounting table is kept at the lower end position against the bias of the air cylinder, and the painting work is restarted. It is possible.

Embodiment Hereinafter, an embodiment in which the present invention is applied to a coating apparatus for coating using a manual spray gun will be described with reference to FIG.

As shown in the figure, a paint pump 5 for pumping the paint a to a spray gun 4 via a paint supply hose 3 is fixed to the upper part of the frame 1, and a strainer 29 is attached to a suction port (not shown) at the lower end of the paint pump 5. A flexible suction hose 6 mounted with is attached to a vertical guide rod 8 fixed to the frame 1, and a mounting table 10 on which a commercially available paint can 9 containing 18 is mounted. The mounting portion 11 is supported so that it can be moved up and down freely, and the side surface of the frame 1 is provided with a cylinder tube 16 made of a non-magnetic material. The fitted air cylinder 15 is fixed in the vertical direction in parallel with the guide rod 8 and fixed to the piston 18 of the piston rod 19 protruding upward from the cylinder tube 16.
The upper end of the cylinder is connected to the bracket 20 projecting from the mounting table 10, and a detection signal is output by the approach of the permanent magnet 17 accompanying the movement of the piston 18 to the position of approximately the middle height of the outer circumference of the cylinder tube 16. The lead switch 22 is attached and connected to a warning device (not shown). The port 31 at the lower end of the air cylinder 15 is
It is connected to the pressurized air pressure source 25 by a pressurized air supply pipe 24 provided with a pressure adjusting valve 26, and the port 3 at the upper end is connected.
2 is open to the atmosphere.

This embodiment has the above-mentioned structure, and when performing painting work,
First, the suction hose 6 is inserted into the paint can 9 placed on the mounting table 10 located at the lower end of the lifting stroke so that the strainer 29 reaches the bottom of the paint can 9 from the opening 28 on the upper surface thereof. , Liquid level is strainer 29
In a state in which the amount of paint that is a little higher than that of a has accumulated a, the secondary pressure of the pressure regulating valve 26 is gradually increased from a zero value, and the value is set to the lower chamber 30
Is set to a value when the mounting table 10 is raised together with the paint can 9 by the upward urging force of the piston 18 due to the pressure of the pressurized air supplied to the coating can 9. When the paint a is replaced with a new paint can 9 which is stored almost completely, the weights of the paint a, the paint can 9 and the mounting table 10 overcome the upward biasing force of the air cylinder 15,
As shown by the solid line in FIG.
0 is located at the lower end of the lifting stroke, and the piston 18 of the air cylinder 15 is located below the lead switch 22.

From this state, drive the paint pump 5 and spray gun 4
When coating is started by operating the trigger 4a, the paint a sucked up from the paint can 9 through the saxion hose 6 is pressure-fed to the spray gun 4 by the paint supply hose 3 and jetted toward an object not shown. As a result, the remaining amount of the paint a in the paint can 9 gradually decreases,
When the liquid surface of the liquid comes close to the bottom surface of the paint can 9 and drops to a position just above the strainer 29, the weight of the paint a is reduced and the biasing force of the air cylinder 15 is relatively overcome, and the piston 18 rises. As the piston rod 19 extends, the mounting table 10 ascends along the guide rod 8 with the paint can 9 mounted thereon as shown by the chain line in FIG. When 17 approaches the reed switch 22, the detection signal output from the reed switch 22 causes a warning lamp (not shown) of a warning device to light up or a warning sound to be emitted. Or, by visually observing the rise of the mounting table 10, the liquid level of the paint a is lower than the suction port of the suction hose 6 and the remaining amount of the paint a before the air is sucked up. Since it is possible to know that there is no,
Stop spraying the paint from the spray gun 4 at a good break and replace the paint can 9 with a small remaining amount with another paint can filled with the paint a, or It suffices to replenish it, so that the mounting table 10
Is lowered to the lower end position of the ascending / descending stroke so that the painting work can be restarted.

The present invention is not limited to the coating apparatus using the manual spray gun 4 as described in the above embodiments, but can be applied to an automatic coating machine in which the spray gun is attached to a reciprocator or a robot. Therefore, in this case, the reed switch 22 may be connected to the control device so that the ejection of the paint is automatically stopped at a good break point by the detection signal output when the mounting table 10 is raised.

[Brief description of drawings]

FIG. 1 attached is a partially cutaway side view of an embodiment of the present invention. 4: Spray gun, 5: Paint pump, 6: Suction hose, 9: Paint can, 10: Mounting table, 15: Air cylinder, 24: Pressurized air supply pipe, 26: Pressure adjusting valve, a: Paint

Claims (1)

[Scope of utility model registration request] 1. A mounting table for mounting a paint tank, which is connected to a paint pump for pumping paint to a spray gun through a saxion hose, is vertically supported along a vertical guide, and the mounting table is supported. An air cylinder for urging in the ascending direction is provided, and a pressure adjusting valve is provided in the pressurized air supply pipe of the air cylinder, and the secondary pressure of the pressure adjusting valve is set in the paint tank on the mounting table. A remaining amount detecting device for a paint tank, wherein the air cylinder sets a pressure for raising the mounting table together with the paint tank when the remaining amount of the paint falls below a certain level.