JPS6333596A - Device for cleaning and recovering paint in electrodeposition - Google Patents

Abstract

PURPOSE:To prevent loss of an electrodeposition paint due to the bubbles of a cleaning soln. by providing second and third showers in addition to the first cleaning shower to defoam the cleaning soln., and furnishing a baffle plate in a cleaning soln. storage tank in the title device for cleaning and recovering an electrodeposition paint on the coated film of an electrodeposited material. CONSTITUTION:Since an electrodeposition paint is stuck on the surface of an electrodeposited film when a material 3 such as an automobile body is electrodeposited, the material is placed in a cleaning chamber 2, and the electrodeposition paint is cleaned off by spraying a cleaning soln. from the first shower device 4. When a cationic paint is used as the electrodeposition paint, a large amt. of foam A are generated in cleaning and stuck on the material 3 to be coated, and the cleaning effect is deteriorated. In this case, the second the third shower devices 12 and 13 are provided at the bottom 8 of the cleaning chamber 2 and in the upper space 9 of the cleaning soln. storage tank 1, the foams A are blocked by the baffle plate 16, the foams A contained in the cleaning soln. freed of contaminants by a strainer 15 are eliminated, and the soln. is again sent to the first shower device 4 by a pump 5. As a result, the cleaning effect on the material 3 to be coated is improved, and the amt. of the electrodeposition paint sticking on the foams, overflowing with the foams, and wastefully discharged is reduced.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a paint recovery and cleaning device for electrodeposition coating.

More specifically, the present invention relates to the cleaning device that takes measures against bubbles.

[Prior art] In electrodeposition painting, the electrodeposition paint physically adheres to the wet electrodeposition coating on the object to be coated when it is pulled up from the electrodeposition tank, and if this continues, the paint will be carried out. The paint is effectively used by cleaning the object to be coated, collecting the adhered paint, and returning it to the electrodeposition bath.

FIG. 2 is a schematic diagram showing an example of such a paint recovery device.

In FIG. 2, (30) is an electrodeposition tank, (31) is an object to be coated such as a car body, and (32) is a paint recovery and cleaning zone.

The paint recovery and cleaning zone (32) is equipped with a paint recovery and cleaning device (3).
3) are installed in multiple stages. Each cleaning device (3
3) is a cleaning liquid storage tank (34), a cleaning chamber (35), and a shower device (36) installed in the cleaning chamber (35).
, a pump (37) for sending the cleaning liquid in the storage tank (34) to the shower device (36). In the cleaning device (33) at the last stage, the showered cleaning liquid is returned to the storage tank (34) at the previous stage.

As the cleaning liquid, a liquid obtained by filtering the coating liquid in the electrodeposition tank (30) is used. That is, the paint liquid in the electrodeposition tank (30) is treated with a purifying device (38), and the obtained liquid is supplied to the storage tank (34) of the cleaning device (33) at the last stage, and the liquid is passed through the pump (37). to the shower device (3B) and the object to be coated (31
) to shower and wash. The cleaning liquid that has washed off the adhered paint is returned to the storage tank (34) at the previous stage.

The cleaning liquid in the storage tank (34) is sequentially sent to the upstream cleaning device (33) through the overflow pipe (39), where the object to be coated (31) is cleaned in the same manner as described above. However, the cleaning liquid in the storage tank (34) is
), and after being showered, it is returned to the same storage tank (34). Through such a cleaning operation, the paint concentration in the cleaning liquid in the storage tank (34) increases as it goes to the front stage, and the cleaning liquid with high paint concentration in the storage tank (34) at the very front stage flows into the electrodeposition tank (34).
30).

[Problems to be Solved by the Invention] However, when a cationic paint is used as an electrodeposition paint, a particularly large amount of foam is generated during cleaning, causing various problems.

i.e. the cleaning chamber (35) as shown in FIG.
When a large amount of foam (A) is generated, the foam (A) is
31), and the cleaning effect decreases. The upper space of the storage tank (34) is also filled with bubbles (A), and the lid (34) is filled with foam (A).
The water flows out from the gap 34a). foam(
If A) flows out to the outside, the recovery rate of the paint decreases, and the burden on the processing equipment for cleaning waste water from the floor increases.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a paint recovery and cleaning device that eliminates the problems caused by the generation of bubbles.

Means for Solving Problems] The present invention is a cleaning device for recovering a sample from an electrodeposition tank onto an object to be coated which has been pulled up from the electrodeposition tank, comprising: (a storage tank for cleaning liquid; (b) a cleaning chamber comprising a first shower device for showering cleaning liquid onto the workpiece; (C) a cleaning liquid supply comprising a pump means for delivering the cleaning liquid in the storage tank to the first shower device; (e) a pipe extending from the bottom of the cleaning chamber to the bottom of the storage tank for sending the foam generated in the chamber to the storage tank together with the showered cleaning liquid; (e) a pipe extending from the bottom of the storage tank to the bottom of the chamber; a duct for returning foam in the storage tank to the chamber; a third shower device for showering the cleaning liquid into the space; and (b) a space above the cleaning liquid level in the storage tank, in which a bubble is formed in the space above and near a portion where the cleaning liquid supply pipe opens into the storage tank. The present invention relates to a paint recovery and cleaning device for electrodeposition coating, which is characterized by comprising a baffle plate extending below the surface of the cleaning liquid from the lid of the storage tank to prevent intrusion.

[Function] Due to the above-mentioned configuration (small), when the bubbles generated in the chamber are returned to the storage tank together with the showered cleaning liquid, they can be brought into contact with the cleaning liquid and defoamed, so the inflow of foam into the storage tank can be greatly reduced. It can be reduced.

According to the configuration (e), the bubbles filled in the storage tank are returned to the chamber, so that the bubbles can be prevented from flowing out from the gap in the lid of the storage tank.

With the above configuration (f>), the foam returned from the storage tank to the chamber is defoamed, so the amount of foam in the chamber is not so large, and problems such as the foam coming into contact with the object to be coated do not occur.

According to the configuration (g), the bubbles in the storage tank are defoamed as much as possible, preventing the bubbles from flowing out to the outside, and also preventing the pump from sucking the bubbles.

The configuration (b) prevents suction of bubbles by the pump.

[Example] Next, the paint recovery and cleaning device of the present invention will be explained based on the drawings.

FIG. 1 is a schematic explanatory diagram showing an embodiment of the cleaning device of the present invention.

The cleaning device shown in FIG. 1 is different from the cleaning device shown in FIG.
33), and a paint recovery device is constructed by connecting a plurality of the cleaning devices.

In Fig. 1, (1) is a cleaning liquid storage tank, ('2J is a cleaning chamber.
) for showering cleaning liquid onto the first shower device (
4) is installed. (5) is a pump and a storage tank (
The cleaning liquid in 1) is sent to the shower device (4) through the distribution W (6) by the pump (5).

(The sword is a pipe that connects the bottom (8) of the cleaning chamber (2) and the lower part of the storage tank (1).A shower is sent from the shower device (4) to the object to be coated (3). The cleaning liquid that has washed away the adhering paint flows into the piping (7) and is returned to the storage tank (1).The shower of cleaning water generates foam (A), but the foam (A) flows into the piping (power supply) along with the cleaning liquid. , where it comes into contact with the cleaning liquid and is largely defoamed.

In this way, in the present invention, the bubbles generated in the cleaning chamber ('2J) do not directly flow into the upper space (g) of the storage tank (1).

η is a duct extending from the lid part 01) of the storage tank (1) to the bottom part (8) of the chamber (2), and the upper space (
g) is filled with bubbles (A), it is returned to the chamber (2) through this duct M. Therefore, the storage tank (
The foam (A) filling the upper space (g) of 1) does not flow out from the gap in the lid part aυ as in the conventional case.

The upper end (10a) of the duct (goods) is a chamber (2).
The cleaning liquid flowing on the bottom (8) is prevented from flowing into the duct (goods).

Inside the chamber ('2J) is the upper end (10a) of the duct M.
) A second shower device 02) for showering cleaning water is installed near the opening of the chamber (2), and showers cleaning liquid onto the foam (A) flowing into the chamber (2) through the duct (to). It is designed to defoam. Therefore, the bubbles (A) do not accumulate in the chamber (2) to the extent that they come into contact with the object (3) to be coated, unlike in the conventional case. The shower device 0 is configured so that washing water is supplied from a pipe (6).

A shower device for showering the cleaning liquid is also installed in the upper space (g) of the storage tank (1). By showering the cleaning liquid from this shower device ■, the storage tank (1
) can reduce the amount of foam (A) in the head space (g). The shower device 0 is configured to be supplied with cleaning liquid from a pipe (6).

The cleaning liquid in the storage tank (1) is pumped to the suction port 04 by the pump (5).
) is sucked into the pipe (6), and a strainer 6 is arranged near the suction port 04) to suck in cleaning water from which dust and the like have been removed.

In the present invention, in order to prevent bubbles (A) from entering the space (ga) above the cleaning liquid surface near the suction port (141), a baffle plate 0■ extending from the lid part aI below the cleaning liquid surface is provided. There is. This baffle plate Of3 is usually provided near the strainer 6 on the side opposite to the suction port (141).

The amount of foam (A) in the space (g) is reduced due to the defoaming effect of the shower of cleaning liquid from the shower device n, and the blocking effect of the baffle plate O■ reduces the amount of foam existing in the space (ga). The amount is extremely small, so there is no risk of bubbles being sucked together with the cleaning liquid when the pump (5) sucks it in. Therefore, the cleaning liquid showered from the shower device (4) will not be contaminated with bubbles, and the chamber ( 2) It is possible to reduce the amount of bubbles inside.

[Effects of the Invention] With the above configuration, the amount of bubbles in the cleaning chamber of the paint recovery cleaning device can be reduced, and problems such as the bubbles coming into contact with the object to be coated and reducing the cleaning effect do not occur, and the cleaning liquid storage tank can be removed. Since there is no risk of bubbles leaking outside, the paint recovery rate is improved and the effort of cleaning the floor and disposing of the waste liquid can be saved. Therefore, it is suitably applied as a cleaning device in cationic electrodeposition coating where bubbles are generated frequently.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing one embodiment of the paint recovery and cleaning device of the present invention, FIG. 2 is a schematic explanatory diagram showing a conventional example of a paint recovery device for electrodeposition coating, and FIG. FIG. 2 is an enlarged schematic explanatory diagram showing a recovery cleaning device. (Main symbols in the drawing) (1): Storage tank (2: Cleaning chamber (3) 2nd object to be coated (4): 1st shower device (7), Piping 00: Duct 02): 2nd shower device D; Third shower device Of3, baffle plate patent applicant Daihatsu Motor Co., Ltd. Figure 2: Cleaning chamber 4: First shower device 7: Piping 10: Duct 12: Second shower device 13: Third shower device Shower device 16: baffle plate

Claims (1)

[Scope of Claims] 1. A cleaning solution, which is a liquid obtained by filtering the paint liquid in the electrodeposition tank, is showered onto the object to be coated that has been pulled up from the electrodeposition tank to recover the paint adhering to the object to be coated. A cleaning device for cleaning, comprising: (a) a storage tank for the cleaning liquid; (b) a cleaning chamber including a first shower device for showering the cleaning liquid onto the object to be coated; (c) a cleaning chamber for cleaning the cleaning liquid in the storage tank. (d) a cleaning liquid supply pipe provided with pump means for conveying to a first shower device; (d) extending from the bottom of said cleaning chamber to the lower part of said reservoir for conveying the foam generated in the chamber together with the showered cleaning liquid to the reservoir; (e) a duct extending from the lid of the storage tank to the bottom of the chamber for returning foam in the storage tank to the chamber; (f) showering cleaning liquid to a portion where the duct opens to the bottom of the chamber; (g) a third shower device for showering the cleaning liquid into the upper space in the storage tank; and (h) a space above the cleaning liquid level in the storage tank, the space above the cleaning liquid level; A paint for electrodeposition coating, characterized by comprising a baffle plate extending below the surface of the cleaning liquid from the lid of the storage tank to prevent foxing from entering the space above the area where the supply pipe opens into the storage tank. Recovery cleaning equipment.