JP3263222B2 - Electrodeposition paint supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodeposition paint supply apparatus.

[0002]

2. Description of the Related Art When an electrodeposition coating is applied to a workpiece, the workpiece is immersed in an electrodeposition tank containing the electrodeposition coating, and the workpiece is energized in this state so that the electrodeposition coating is deposited on the surface of the workpiece. I have to. At this time, when the electrodeposition coating on the work is repeated, only the paint component is reduced and only the solvent component remains in the electrodeposition tank, the coating concentration in the electrodeposition tank is reduced, and a sufficient film thickness of the electrodeposition coating is obtained. Is known not to be obtained. Therefore, conventionally, the number of times the work is immersed in the electrodeposition tank is detected by a counter, and when the number of immersions reaches a certain number, the electrodeposition paint is supplied from the electrodeposition paint supply tank to the electrodeposition tank. Is performed.

FIG. 2 shows a piping diagram of such a conventional electrodeposition paint supply apparatus.
1 is an electrodeposition tank, 52 is an electrodeposition paint supply pipe connecting the paint tank 50 and the electrodeposition tank 51, and the electrodeposition paint supply pipe 52 is provided with an opening / closing valve 53, a pump 54, a filter 55, and a flow meter 56. ing. Then, when the number of times of immersion of the workpiece reaches a certain number during the electrodeposition operation, the electrodeposition paint in the electrodeposition paint supply tank 50 is discharged by the pump 54 until the flow meter 56 shows a predetermined flow rate. It is supplied to the electrodeposition tank 51 through the coating liquid supply pipe 52.

On the other hand, when the electrodeposition operation is stopped, the opening / closing valve 53 is closed, the supply of the electrodeposition paint is stopped, and this state is continued until the next electrodeposition operation is restarted. Further, the electrodeposition paint is constantly stirred by the stirring device 57 irrespective of whether the electrodeposition work is being performed or stopped.

[0005]

In such a conventional electrodeposition paint supply apparatus, since the electrodeposition paint remains in the electrodeposition paint supply pipe 52 during the suspension of the electrodeposition work,
The electrodeposition paint adheres to the inner surface of the pipe 52, and if the number of times of electrodeposition increases, there is a concern that the diameter of the pipe 52 may be reduced by lamination.
In such a case, it takes time to supply the electrodeposition paint, and the work may be electrodeposited while the paint concentration in the electrodeposition tank 51 is low. When such electrodeposition coating is performed, the thickness of the paint on the work becomes insufficient, and there is a possibility that a problem on rust prevention may occur, and a process for removing it is required,
There was a problem that the number of processes was increased. On the other hand, there is a method of arranging a circulation pipe to the electrodeposition paint supply tank 50 in the middle of the electrodeposition paint supply pipe, and circulating the electrodeposition paint by switching the piping system during the suspension of the electrodeposition work. According to the method described above, since the circulation pipe is in a halt state during the electrodeposition work, the electrodeposition paint remains in the circulation pipe system and adheres to the pipe.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is to connect an electrodeposition tank and an electrodeposition paint supply tank with an electrodeposition paint supply pipe, and to connect the electrodeposition tank side of the electrodeposition paint supply pipe with the electrodeposition paint supply pipe. Opening / closing valves are respectively provided on the electrodeposition paint supply tank side, and a pure water circulation pipe is connected to a downstream of the electrodeposition paint supply tank open / close valve of the electrodeposition paint supply pipe and a pure water circulation tank by a pure water supply pipe. An opening / closing valve is provided in the water supply pipe, and the pure water circulation tank is connected to the upstream side of the opening / closing valve on the electrodeposition tank side of the electrodeposition paint supply pipe by the pure water circulation pipe. A valve is provided.

[0007]

When the electrodeposition work is suspended, first, pure water in the pure water circulation tank is supplied to the electrodeposition paint supply pipe via the pure water supply pipe to replace the electrodeposition paint with pure water. Circulation tank,
The pure water is circulated between the pure water supply pipe, the electrodeposition paint supply pipe, and the pure water circulation pipe. This prevents the electrodeposition paint from remaining in the electrodeposition paint supply pipe, and prevents the electrodeposition paint from adhering to the electrodeposition paint supply pipe even during long-term use.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a piping diagram of an electrodeposition paint supply device according to the present invention.
Is an electrodeposition tank, 3 is an electrodeposition paint supply pipe connecting the electrodeposition paint supply tank 1 and the electrodeposition tank 2, and the electrodeposition paint supply pipe 3 is provided with an opening / closing valve 4 in order from the electrodeposition paint supply tank 1 side. A pump 5, a filter 6, a flow meter 7, and an on-off valve 8 are provided.

Reference numeral 9 denotes a pure water circulation tank.
On the one hand, it is connected to the downstream side of the opening / closing valve 4 of the electrodeposition paint supply pipe 3 via the pure water supply pipe 10, and on the other hand, upstream of the opening / closing valve 8 of the electrodeposition paint supply pipe 3 via the pure water circulation pipe 11. Connect to the side. An opening and closing valve 12 is provided in the pure water supply pipe 10, and an opening and closing valve 13 is provided in the pure water circulation pipe 11. Further, a drain pipe 14 is provided in the pure water circulation tank 9,
An open / close valve 15 is provided in the drain pipe 14.

Reference numeral 16 denotes a pure water tank.
Is connected to a pure water circulation tank 9 through a pure water supply pipe 17, and the pure water supply pipe 17 is provided with an opening / closing valve 18 and a pump 19.

In the above, during the electrodeposition operation, the work is immersed in the electrodeposition tank 2, and in this state, the work is energized to deposit and deposit the electrodeposition paint on the work surface. At this time, when the number of times that the work is immersed in the electrodeposition tank 2 reaches a certain number, the opening and closing valves 4 and 8 are opened, and the power of the pump 5 causes the flow of the electrodeposition paint supply tank until the flow meter 7 shows a predetermined flow rate. 1 to electrodeposition tank 2
Supply electrodeposition paint inside. This is because, when the electrodeposition coating on the workpiece is repeated, only the paint component decreases in the electrodeposition tank 2 and only the solvent component remains, and the paint concentration in the electrodeposition tank 2 is reduced, thereby preventing the paint concentration. .

By the way, when the above-mentioned electrodeposition work is stopped, first, the opening and closing valve 4 is opened and the opening and closing valve 12 is opened, and the pure water in the pure water circulation tank 9 is supplied from the pure water supply pipe 10 to the electrodeposition paint 10. The electrodeposition paint flows into the supply pipe 3, and the electrodeposition paint in the electrodeposition paint supply pipe 3 is discharged to the electrodeposition tank 2, and the electrodeposition paint in the electrodeposition paint supply pipe 3 is replaced with pure water.
Next, the open / close valve 8 is closed and the open / close valve 13 is opened to circulate pure water between the pure water circulation tank 9, the pure water supply pipe 10, the electrodeposition paint supply pipe 3, and the pure water circulation pipe 11. The pure water in the pure water circulating tank 9 opens the opening / closing valve 15 after one stop of the electrodeposition work to open the drain pipe 1.
4 to the outside. Thereafter, the open / close valve 18 is opened, and pure water is supplied from the pure water tank 16 into the pure water circulation tank 9 by the power of the pump 19 via the pure water supply pipe 17.

As described above, according to the configuration of the present embodiment, even when the electrodeposition operation is stopped, pure water is supplied from the pure water circulation tank 9 to the electrodeposition paint supply pipe 3 via the pure water supply pipe 10. Inflow,
First, after replacing the electrodeposition paint in the electrodeposition paint supply pipe 3,
Since pure water is circulated between the pure water circulation tank 9, the pure water supply pipe 10, the electrodeposition paint supply pipe 3, and the pure water circulation pipe 11, the electrodeposition paint remains in the electrodeposition paint supply pipe 3. Without doing so, it is possible to prevent the electrodeposition paint from being deposited and deposited on the electrodeposition paint supply pipe 3 even when used for a long time. In addition, generation of bacteria and the like can be prevented. Therefore, a step for removing the electrodeposition paint as in the related art becomes unnecessary.

[0014]

As described above, according to the present invention, the pure water circulation tank is connected to the downstream side of the opening / closing valve on the electrodeposition paint supply tank side of the electrodeposition paint supply pipe by the pure water supply pipe. The pure water circulating tank is connected to the downstream side of the opening / closing valve of the electrodeposition coating supply pipe on the electrodeposition tank side with the pure water circulating tank. It is supplied into the pipe to replace the electrodeposition paint with pure water, and is further circulated between the pure water circulation tank, the pure water supply pipe, the electrodeposition paint supply pipe, and the pure water circulation pipe. The electrodeposition paint can be prevented from remaining in the inside, and the electrodeposition paint can be prevented from adhering to the electrodeposition paint supply pipe even after long-term use.

[Brief description of the drawings]

FIG. 1 is a piping diagram of an electrodeposition paint supply pipe according to the present invention.

FIG. 2 is a piping diagram of a conventional electrodeposition paint supply pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Electrodeposition paint supply tank 2 ... Electrodeposition tank 3 ... Electrodeposition paint supply pipe 4, 8, 12, 13 ... Opening / closing valve 10 ... Pure water supply pipe 11 ... Pure water circulation pipe 16 ... Pure water tank 17 ... Pure water Supply piping

Claims (1)

(57) [Claims] An electrodeposition tank and an electrodeposition paint supply tank are connected by an electrodeposition paint supply pipe, and open / close valves are provided on the electrodeposition tank side and the electrodeposition paint supply tank side of the electrodeposition paint supply pipe, respectively. Connecting the pure water circulation tank with the downstream of the opening / closing valve of the electrodeposition paint supply tank of the electrodeposition paint supply pipe by a pure water supply pipe, and providing an on / off valve in the pure water supply pipe,
The pure water circulating tank is connected to the upstream side of the opening / closing valve of the electrodeposition paint supply pipe on the electrodeposition tank side by a pure water circulating tank, and an opening / closing valve is provided in the pure water circulating pipe. Electrodeposition paint supply device.