JPS6236849Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention is installed at a later stage such as an electrodeposition paint tank of an electrodeposition coating device or a chemical treatment chamber of a painting pre-treatment device, and is carried out from the electrodeposition paint tank or chemical treatment chamber. The present invention relates to improvements in water washing equipment used in electrodeposition coating, etc., for washing coated objects or objects to be treated.

For example, in electrodeposition coating, unelectrodeposited paint adheres to the surface of the workpiece that is pulled out of the electrocoat tank after electrodeposition, and if a film of this non-electrodeposition paint remains, it may cause coating defects. Since this may result in coating defects such as poor water resistance, several water washing devices are generally disposed downstream of the electrocoating paint tank to wash the objects to be coated taken out from the electrocoating paint tank.

FIG. 1 is a schematic explanatory diagram showing an example of an electrodeposition paint tank and a water washing device disposed at the subsequent stage of such an electrodeposition coating apparatus. The electrodeposition paint tank 4 receives the overflowing paint from the electrodeposition paint tank 1 and discharges air bubbles, and also performs paint circulation, replenishment, and adjustment of paint composition balance. A sub-tank S for carrying out the electrocoating is a washing device in which a washing shower device 6 is disposed in a washing chamber 5 connected to the rear stage of the electrodeposition paint tank 1.

The flushing shower device 6 includes a riser pipe 7 to which a plurality of injection nozzles are attached at predetermined intervals along the longitudinal direction, a water supply pipe 8 called a header pipe in which a plurality of riser pipes 7 are arranged in parallel at predetermined intervals, and a water supply pipe 8 called a header pipe. It consists of a pump 10 that pumps cleaning water stored in a water tank 9 through a water supply pipe 8 to riser pipes 7, 7, . . . The object to be painted 3 is sprayed with cleaning water from each riser pipe 7.
It is designed to clean non-electrodeposition paint that adheres to the surface of the

The cleaning water sprayed from the riser pipe 7 as described above is received by the chamber bottom plate 11 constituting the bottom of the cleaning chamber 5, and is returned to the cleaning water tank 9 through the cleaning water recovery port 12 formed in the bottom plate 11. The waste is collected and recycled.

By the way, when the cleaning water is sprayed from the riser pipe 7 to the object 3 to be coated which has paint that is not electrodeposited on the surface as described above, the paint is scattered together with the cleaning water and is splashed onto the wall surface of the washing chamber 5. If the paint adheres and is left unattended, the wall surface of the washing room 5 will dry when the painting line is stopped at night, on holidays, etc., and the adhered paint will precipitate on the surface. The paint that has dried and deposited on the wall of the washing room 5 in this way becomes paint scum and separates from the wall when the painting line is operated again and washing water is sprayed from the riser pipe 7, and the paint is recycled. mixed into the washing water.

In particular, in the case of cationic electrodeposition paint, since it becomes smooth when dried, it easily separates from the wall surface and becomes paint scum that gets mixed into the cleaning water.

As described above, if paint scum is mixed into the cleaning water, there is a problem that the injection nozzle of the riser pipe 7 is clogged or a coating defect is caused on the object 3 to be coated during cleaning.

Therefore, in the past, a method has been adopted in which, for example, immediately after the painting line has stopped, that is, at the end of the work when the wall surface of the painting room 5 has not yet dried, the wall surface is cleaned by blowing out the cleaning water in the cleaning water tank 9 from the riser pipe 7. It is being

However, although this method has the advantage of being able to clean the wall before it dries, the concentration of paint in the cleaning water is extremely high at the end of the work, and the wall must be washed with contaminated water.
There is a drawback that paint remains on the wall surface, and it has not been an effective means to eliminate the above-mentioned problems.

In addition, cleaning is not limited to the water washing device S disposed after the electrocoating paint tank 1 as described above, but also in the water washing device S disposed after the chemical treatment chamber of the painting pretreatment device, for example. Chemicals, dirt, sludge, etc. adhering to the surface of the workpiece are scattered with the washing water sprayed from the riser pipe, adhere to the walls of the washing room, form clumps, fall into the washing water, and get mixed in. This caused problems such as clogging of the riser pipe's injection nozzle.

In view of the above, the present invention supplies relatively clean washing water from a fluid guide member separately installed on the wall of the washing room to wash it, thereby reliably preventing the precipitation of paint scum, etc. The purpose is to provide a water washing device.

In order to achieve this purpose, the present invention has developed a water washing shower device that sprays cleaning water from a riser pipe toward the object to be coated or the object to be pretreated in a washing chamber provided in an electrodeposition coating device or a painting pretreatment device. In the flushing device, a liquid guide member for supplying cleaning liquid for flushing the wall surface of the flushing chamber is arranged horizontally along the wall surface at a higher position than the riser pipe provided in the flushing chamber. It is characterized by being

Hereinafter, the present invention will be explained based on specific embodiments shown in the drawings.

FIG. 2 is a front view showing an example of the water washing device according to the present invention.

The flushing device S includes a chamber C forming a flushing chamber 5.
Water supply pipes 8 and 8 of the flush shower device 6 are disposed horizontally and opposite each other, and a plurality of riser pipes 7 having injection nozzles 13 are arranged vertically in parallel at required intervals in each water supply pipe 8 and 8. A water supply pipe 8' is arranged parallel to the water supply pipes 8 and 8 at an intermediate position thereof, and on both sides of the water supply pipe 8', a plurality of riser pipes 7' each having an upwardly attached injection nozzle 13 are installed at a required interval. are arranged horizontally. Further, a wash water recovery port 12 is formed in the chamber bottom plate 11 of the wash chamber 5, and the wash water recovery port 12 is connected to the wash water tank 9 via a recovery pipe 14.

At an upper position in the chamber C, a shower pipe 1 is provided as a liquid guide member for supplying a cleaning liquid for washing the wall surfaces of the chamber side walls 15, 15.
6, 16 are arranged horizontally along the chamber side walls 15, 15, respectively, at a higher position than the riser pipes 7, 7....

Each shower tube 16 has a plurality of spray shower nozzles 17 arranged at required intervals along its longitudinal direction, facing the chamber side wall 15.

The above is an example of the configuration of the water washing device according to the present invention, and its operation will be explained next.

For example, when the water washing device S shown in FIG. 2 is disposed downstream of the electrocoating paint tank 1 as shown in FIG. The non-electrodeposition paint adhering to the surface of the object to be painted 3 is scattered by the cleaning water sprayed from the spray nozzles 13, 13, . . . of the riser pipes 7, 7 and 7', and the cleaning water is It also adheres to the inner surfaces of the chamber side walls 15, 15 constituting the washing chamber 5.

If this is left unattended, the surface of the chamber side wall 15 will dry when the painting line is stopped at night or on holidays, and the adhering paint will deposit on the surface, causing paint scum and the like to be generated.

However, in the present invention, since the shower pipes 16, 16 each having a spray shower nozzle 17 are disposed at an upper position in the chamber C along the chamber side walls 15, 15 substantially horizontally, the painting line cannot be stopped. At the same time, that is, when the work is completed, relatively clean cleaning water is forced into the shower pipe 16 and sprayed from the spray shower nozzle 17 to clean the surface of the chamber side wall 15.
Paint adhering to the surface can be easily and reliably removed before it dries.

In addition, non-electrodeposition paint, which is sprayed from the spray nozzles 13, 13... of the riser pipes 7, 7 and 7', hits the object 3 to be coated and scatters in all directions. Many substances adhere to the chamber side wall 15 at a high position where the cleaning water cannot reach. Spray shower nozzle 17
By spraying the cleaning liquid from the chamber side wall 15, there will be no residual paint remaining on the chamber side wall 15, and the generation of paint scum that would clog the riser pipes 7, 7 and 7' can be reliably suppressed.

Further, a dedicated shower pipe 16 for washing the wall surface of the chamber side wall 15 is connected to the riser pipes 7, 7 and 7'.
Since the riser pipes 7, 7, and 7' are provided separately from the chamber side wall 15, the paint that has spattered and adhered to the chamber side wall 15 while cleaning the object 3 is removed from the chamber side wall 15. It can be washed off instantly with the cleaning liquid that is constantly flowing down along the surface. Therefore, the amount of paint remaining on the surface of the chamber side wall 15 is significantly reduced.

As described above, according to the present invention, the shower pipe 16 as a liquid guiding member is disposed above the washing chamber 5.
is arranged horizontally along the wall surface and is configured to supply clean washing water to the wall surface, so that it can be used for chemical treatment in the electrodeposition paint tank of the electrodeposition coating device or the pre-treatment device for painting. When applied to a water washing device that is disposed at a later stage of the chamber, etc., and that cleans objects to be coated or objects to be treated that have been carried out from the electrocoating paint tank or the chemical treatment chamber,
Paint, sludge, dirt, etc. adhering to the walls of the flushing chamber 5 are reliably removed before drying and solidifying, thus preventing problems such as clogging of the riser pipe 7 or 7', and preventing the flushing device from becoming clogged. This has the effect of significantly reducing the frequency of cleaning.

In the above-mentioned embodiment, a shower pipe 16 in which a plurality of spray shower nozzles 17 are arranged along the longitudinal direction is applied as a liquid guiding member, but the liquid guiding member according to the present invention is However, the present invention is not limited to this, and it may be a shower pipe in which a plurality of through holes are bored at required intervals along the longitudinal direction. Overflow gutter 18 that supplies the chamber side wall 15 of the flush chamber 5
can also be applied. However, when using the overflow gutter 18, a relatively large amount of washing water is required to be supplied, whereas when using the shower pipe 16 having a spray shower nozzle 17 as in the embodiment shown in FIG. It has the advantage of being able to thoroughly clean the wall surface with an extremely small amount of water.

By the way, as mentioned above, the water washing device S disposed after the electrodeposition paint tank 1 is generally a water washing device S that automatically collects and purifies the paint taken out during electrodeposition coating and washing water, as shown in Fig. 4. The filtrate obtained by the filtration device 20 called an ultra filtration (U/F) device is used for circulation as washing water, and the filtrate supplied into the washing water tanks 9a to 9c is passed through each pump. 10 to the riser pipe 7 and spray it onto the object 3 to be coated.

That is, the filtration device 20 is a so-called molecular sieve that allows the paint to pass through a polymer membrane surface having ultra-fine pores, and extracts a substantially transparent filtrate mainly composed of water from the electrodeposition paint liquid in the sub-tank 4. The pump 21 supplies this water through the filtrate supply pipe 22 to the washing water tank 9c of the final stage water washing device S3 and uses it as washing water. The water overflows from the washing water tank 9b of the washing device S2 and is supplied to the washing water tank 9a of the washing device S1 disposed immediately after the electrodeposition paint tank 1. Piping 2 by 23
The solution generated by water washing is supplied into the sub-tank 4 through 4, and is separated into effective paint components and low molecules such as amines or water, and the active paint components are pumped into the sub-tank 4.
5 so that it is returned into the electrodeposition paint tank 1 through a pipe 26.

In this way, the reason why the object to be coated 3 taken up from the electrocoating paint tank 1 is first cleaned using the filtrate is to prevent a defective coating from occurring on the object to be coated. If pure water is used for cleaning, troubles may occur, such as poor coating on the surface of the object 3 to be coated or the paint eluted in the cleaning water gelling and solidifying.

As described above, when the liquid guiding member according to the present invention is disposed in the washing devices S1 to S3 that use filtrate for washing, and the washing water made of pure water or the like is discharged from the liquid guiding member, the above-mentioned effect can be achieved. A new required amount of water is added from the outside into the filtrate circulation system, and as a result, the liquid level in each wash water tank 9a to 9c rises, and the amount of water supplied to the sub tank 4 increases significantly. It becomes very difficult to control the concentration of the paint, amine, etc. in the electrodeposition paint liquid, and the balance of the paint composition is lost, resulting in variations in the coating finish of the object 3 to be coated.

Therefore, in the electrodeposition coating apparatus as shown in FIG. branch pipe 27 to be connected,
27... are formed into branches, and the pump 2
1, the filtrate is pumped through each branch pipe 27 as appropriate.
The paint is supplied through the shower pipes 16 disposed in each of the washing devices S1 to S3, and is injected from the shower pipes 16 to the wall surface of the washing chamber 5 to wash away paint adhering to the wall surface. There is.

In this way, if the filtrate purified by the filtration device 20 is supplied to the shower pipe 16 and sprayed, the wall surface of the washing chamber 5 is always washed with the clean filtrate, and as described above, Unlike when cleaning with pure water, there is no problem such as the paint gelling or the paint composition being unbalanced.

Note that as the filtration device 20, a reverse osmosis (R/O) device can also be applied in addition to the above-mentioned ultrafiltration device.

As described above, according to the present invention, a liquid guide member is disposed horizontally along the wall above the washing chamber for supplying cleaning liquid for washing the wall, and the liquid guide member is provided with, for example, The effect is that paint, sludge, dirt, etc. adhering to the walls of the washing room can be easily and reliably washed away by simply supplying washing water at the end of the work.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing an example of an electrodeposition coating device, FIG. 2 is a front view showing an example of a water washing device according to the present invention, and FIG. 3 is a main part showing another example of a water washing device according to the present invention. FIG. 4 is a schematic explanatory view showing an example in which the water washing device according to the present invention is applied to an electrodeposition coating device. Explanation of symbols, S, S1 to S3...Water washing device, 1
...Electrodeposition paint tank, 3...Object to be coated, C...Chamber, 5...Washing room, 6...Washing shower device, 7
... Riser pipe, 8 ... Water supply pipe, 9, 9a to 9c
. . . Wash water tank, 10 . . . Pump, 11 .
...filtration device, 21 ... pump, 22 ... filtrate supply pipe, 27 ... branch pipe, 28 ... solenoid valve.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A washing shower device that sprays washing water from a riser pipe toward the object to be coated or the object to be treated is provided in the washing chamber provided in the electrodeposition coating device or the coating pretreatment device. In the installed water washing device,
A liquid guide member for supplying a cleaning liquid for washing the wall surface of the washing chamber is arranged horizontally along the wall surface at a higher position than the riser pipe provided in the washing chamber. Water washing equipment. (2) The water washing device according to claim 1, wherein the liquid guide member is a shower pipe in which spray shower nozzles are arranged at predetermined intervals. (3) The water washing device according to claim 1, wherein the liquid guide member is a shower pipe having through holes formed at predetermined intervals. (4) The water washing device according to claim 1, wherein the liquid guiding member comprises an overflow gutter. (5) The above-mentioned utility model registration request where the cleaning liquid used to clean the wall surface of the washing room is a filtrate obtained by a filtration device that automatically collects and purifies the paint taken out during electrodeposition coating and the cleaning water. The water washing device according to item 1.