JP2008024960A - Apparatus for treatment before coating and electrodeposition coating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for treatment before coating in which a sufficient water level is secured even in a washing tank in the rear side of the advancing direction of a material to be treated and low contaminated cleaning water over-flown from the washing tank in the fore side is directly used for cleaning the material to be treated in the washing tank in the rear side, and an electrodeposition coating apparatus. <P>SOLUTION: The apparatus for treatment before coating comprises a plurality of the washing tanks arranged in series ahead of a chemical treatment tank in the advancing direction of the material to be treated wherein the washing tank has a spray nozzle, a pipe line from the washing tank to the nozzle and a circulation pump arranged in the midway of the pipe line. The cleaning water overflown from the washing tank in the fore side is sent to the washing tank in the rear side in order and a pipe line for supplying the cleaning water overflown from the washing tank to a suction port of the circulation pump provided in the washing tank in the nearest rear side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a coating pretreatment apparatus and an electrodeposition coating apparatus.

A chemical treatment tank and a plurality of water washing tanks arranged in series in front of the chemical treatment tank with respect to the traveling direction of the object to be processed are provided, and the water washing tank is in the middle of the pipe and the pipe from the washing tank to the spray nozzle. Patent Document 1 discloses a coating pretreatment apparatus that has a circulation pump disposed therein, and in which cleaning water overflowed from a front water rinsing tank is forwarded to a rear water rinsing tank.
The electrodeposition tank and a plurality of water washing tanks arranged in series in front of the electrodeposition tank with respect to the traveling direction of the object to be processed are provided, and the water washing tank is in the middle of the pipe and the pipe from the water washing tank to the spray nozzle. Patent Document 2 discloses an electrodeposition coating apparatus that has a circulation pump disposed therein and in which cleaning water overflowed from a front water rinsing tank is forwarded to a rear water rinsing tank.
In the conventional coating pretreatment apparatus and electrodeposition coating apparatus disclosed in Patent Documents 1 and 2, etc., the forward feeding from the front flushing tank to the flushing tank behind the flushed water is natural using an inclined pipe. It was done by water flow.
JP 2002-102788 A JP 2003-105594 A

In conventional coating pretreatment equipment and electrodeposition coating equipment, the water level has to be lowered sequentially from the front washing tank to the rear washing tank, and the amount of washing water decreases in the rear washing tank, resulting in contamination of the washing water. There is a problem that the degree of cleaning becomes high and a sufficient cleaning effect cannot be obtained. Moreover, since the wash water overflowed from the front washing tank simply flows into the rear washing tank, the washing water having a low degree of contamination at the front cannot be immediately used for washing the object to be treated, and a sufficient washing effect cannot be obtained. There is also a problem.
The present invention has been made in view of the above problems, and it is possible to secure a sufficient water level even in the rear washing tank with respect to the traveling direction of the object to be processed, and the less contaminated washing water overflowed from the front washing tank is disposed in the rear. It is an object of the present invention to provide a coating pretreatment apparatus and an electrodeposition coating apparatus that can be used for immediately washing an object to be treated in a water washing tank.

In order to solve the above problems, in the present invention, a chemical treatment tank and a plurality of washing tanks arranged in series in front of the chemical treatment tank with respect to the traveling direction of the object to be processed, the washing tank includes a spray nozzle, A pretreatment device for painting that has a pipe from the washing tank to the spray nozzle and a circulation pump arranged in the middle of the pipe, and the washing water overflowed from the front washing tank is forwarded to the rear washing tank, Provided is a coating pretreatment apparatus comprising a pipe for supplying wash water overflowed from a water rinsing tank to a suction port of a circulation pump included in a water washing tank immediately behind.
Moreover, in this invention, it is equipped with an electrodeposition tank and the several water washing tank arranged in series ahead of the electrodeposition tank regarding the advancing direction of a to-be-processed object, and a water washing tank reaches a spray nozzle from a spray nozzle and a water washing tank. An electrodeposition coating apparatus having a pipe and a circulation pump arranged in the middle of the pipe, in which the wash water overflowed from the front washing tank is forwarded to the rear washing tank, and the washing water overflowed from the washing tank An electrodeposition coating apparatus is provided that includes a pipe that supplies a suction port of a circulation pump included in a water cistern in the immediate rear.
In the coating pretreatment apparatus and the electrodeposition coating apparatus according to the present invention, the washing water overflowed from the front washing tank is supplied to the suction port of the circulation pump of the nearest rear washing tank, and the circulation from the latest washing tank is performed. It is mixed with the washing water in the washing tank sucked into the pump and discharged from the spray nozzle.
Since the forward water flow from the front washing tank to the rear washing tank is not a natural water flow using an inclined pipe but a forced water flow, the water level in the washing tank is directed from the front washing tank to the rear washing tank. There is no need to lower it sequentially. Therefore, it is possible to secure a sufficient water level even in the rear water washing tank to suppress an increase in the degree of contamination of the washing water, and to ensure sufficient washing performance.
Since the washing water with a low degree of contamination sent from the front washing tank to the rear washing tank is supplied to the suction port of the circulation pump of the rear washing tank, the washing water with a low degree of contamination is immediately supplied to the rear washing tank. It can be used to clean the workpiece and ensure sufficient cleaning performance.

In the preferable aspect of this invention, the circulation pump is arrange | positioned below the water surface of the washing tank.
By arranging the circulation pump below the water surface of the rinsing tank, the generation of negative pressure (gauge pressure) at the circulation pump suction port is suppressed, and a pipe connecting the rinsing tank immediately in front and the suction port is provided. The circulation pump can be prevented from sucking in air.

According to the present invention, a sufficient water level can be secured even in the rear washing tank with respect to the traveling direction of the object to be processed, and the washing water with a low degree of contamination overflowing from the front washing tank can be immediately washed in the rear washing tank. An available coating pretreatment device and electrodeposition coating device are provided.

Examples of the present invention will be described.
In the following description, the directions of arrows I, II, III, and IV in FIG. 1 are referred to as front, rear, upper, and lower, respectively.
As shown in FIG. 1, the coating pretreatment apparatus A includes a chemical solution treatment tank 1, a first water washing tank 2, a second water washing tank 3, and a third water washing tank 4 arranged in series sequentially from the rear to the front. I have. A chemical solution for surface treatment of an object to be processed is stored in the chemical solution processing tank 1, and cleaning water is stored in the first water washing tank 2, the second water washing tank 3, and the third water washing tank 4.
The tanks 1, 2, 3, and 4 are spray nozzles 1a, 2a, 3a, and 4a disposed immediately above the tank, and circulation pipes 1b, 2b, and 3b that extend from the bottom of the tank to the spray nozzles 1a, 2a, 3a, and 4a. 4b, circulation pumps 1c, 2c, 3c, and 4c disposed in the middle of the circulation pipes 1b, 2b, 3b, and 4b, and overflow weirs 1d, 2d, 3d, and 4d disposed at the upper rear end of the tank, have.
Circulation pumps 1c, 2c, 3c, and 4c are disposed below the water surface of tanks 1, 2, 3, and 4, preferably below the bottom walls of tanks 1, 2, 3, and 4, respectively.

A chemical solution supply pipe 5 is connected to the front upper end of the chemical solution treatment tank 1. A chemical solution discharge pipe 6 extends downward from the overflow weir 1d.
A fresh water supply pipe 7 is connected to the front upper end of the third water washing tank 4.
A water supply pipe 8 extending from the overflow weir 4d is connected to the suction port of the circulation pump 3c, more precisely to the circulation pipe 3b immediately upstream of the circulation pump 3c.
A water supply pipe 9 extending from the overflow weir 3d is connected to the suction port of the circulation pump 2c, more precisely to the circulation pipe 2b immediately upstream of the circulation pump 2c.
A washing water discharge pipe 10 extends downward from the overflow weir 2d.

An overhead rail 11 is disposed above the tanks 1, 2, 3, 4 and extends in the front-rear direction. A plurality of tact type conveying devices 12 are engaged with the overhead rail 11 at predetermined intervals in the front-rear direction. The tact type transfer device 12 moves from the rear to the front along the overhead rail 11. An automobile body A, which is an object to be processed, is placed and fixed on the tact type transfer device 12.

The operation of the coating pretreatment apparatus according to this embodiment will be described.
Fresh water is supplied to the third washing tank 4 through the fresh water supply pipe 7. The washing water in the third washing tank 4 is sent from the lower part of the tank to the spray nozzle 4a through the circulation pipe 4b and the circulation pump 4c, discharged from the spray nozzle 4a and returned to the upper part of the tank. The wash water overflowing from the third rinsing tank 4 beyond the overflow weir 4d is sucked into the circulation pump 3c of the second rinsing tank 3 through the water supply pipe 8.
The washing water in the second washing tank third is sucked into the circulation pump 3c from the lower part of the tank through the circulation pipe 3b and mixed with the washing water supplied from the third washing tank 4 through the water supply pipe 8, It is sent to the spray nozzle 3a, discharged from the spray nozzle 3a, and returned to the upper part of the tank. Wash water that overflows the overflow dam 3d and overflows from the second flush tank 3 is sucked into the circulation pump 2c of the first flush tank 2 through the water supply pipe 9.
The washing water in the first washing tank second is sucked into the circulation pump 2c from the lower part of the tank through the circulation pipe 2b and mixed with the washing water supplied from the second washing tank 3 through the water supply pipe 9, It is sent to the spray nozzle 2a, discharged from the spray nozzle 2a, and returned to the upper part of the tank. The wash water overflowing from the first washing tank 2 over the overflow weir 2d is sent to the waste liquid treatment tank through the washing water discharge pipe 10.
A chemical solution is supplied to the chemical solution processing tank 1 through the chemical solution supply pipe 5. The chemical solution in the chemical treatment tank 1 is sent from the lower part of the tank to the spray nozzle 1a through the circulation pipe 1b and the circulation pump 1c, discharged from the spray nozzle 1a, and returns to the upper part of the tank. The chemical liquid overflowing the overflow weir 1d and overflowing from the chemical liquid treatment tank 1 is sent to the waste liquid treatment tank through the chemical liquid discharge pipe 6.

The tact type transfer device 12 moves from the rear to the front above the tanks 1 to 4 and stops above the spray nozzles 1a, 2a, 3a and 4a to move the vehicle body A to the positions of the spray nozzles 1a, 2a, 3a and 4a. The vehicle body A is raised after a predetermined time, and separated from the spray nozzles 1a, 2a, 3a, 4a.
The chemical liquid discharged from the spray nozzle 1a surface-treats the automobile body A. The washing water discharged from the spray nozzles 2a, 3a, 4a wash away the excess chemical solution adhering to the automobile body A. Since the degree of contamination of the washing water becomes lower in the order of the washing tanks 2, 3, and 4, the automobile body A is washed with cleaner washing water as the washing process proceeds.

The forward flow of the washing water from the front washing tanks 4 and 3 to the rear washing tanks 3 and 2 with respect to the traveling direction of the automobile body A is not a natural water flow but a forced water flow using the circulation pumps 3c and 2c. It is not necessary to sequentially lower the water level from the front washing tanks 4 and 3 toward the rear washing tanks 3 and 2. Accordingly, a sufficient water level can be secured even in the rear water washing tanks 3 and 2 to suppress an increase in the degree of contamination of the washing water, and sufficient washing performance can be ensured.
Since the washing water with a low degree of contamination sent from the front washing tanks 4 and 3 to the rear washing tanks 3 and 2 is supplied to the suction ports of the circulation pumps 3c and 2c of the rear washing tanks 3 and 2, the contamination The washing water with a low degree can be immediately used for washing the automobile body A in the washing tanks 3 and 2 at the rear, and sufficient washing performance can be secured.

By arranging the circulation pumps 3c and 2c below the water surface of the washing tanks 3 and 2, preferably below the bottom walls of the washing tanks 3 and 2, negative pressure at the suction ports of the circulation pumps 3c and 2c ( Since the generation of the gauge pressure) is suppressed, even if the water level in the washing tanks 4 and 3 is lower than the overflow weirs 4d and 3d and the overflow of the washing water from the washing tanks 4 and 3 is stopped, the water supply pipes 8 and 9 The circulation pumps 3c and 2c do not suck air through the.

The present invention can also be used in an electrodeposition coating apparatus in which the chemical treatment apparatus 1 is replaced with an electrodeposition tank.

INDUSTRIAL APPLICABILITY The present invention is widely applicable to a coating pretreatment apparatus and an electrodeposition coating apparatus that include a water washing tank with a spray nozzle.

It is a block diagram of the coating pre-processing apparatus which concerns on the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chemical solution processing apparatus 2 1st water washing tank 3 2nd water washing tank 4 3rd water washing tank 1a, 2a, 3a, 4a Spray nozzle 1b, 2b, 3b, 4b Circulation piping 1c, 2c, 3c, 4c Circulation pump 1d, 2d 3d, 4d Overflow weir 5 Chemical liquid supply pipe 6 Chemical liquid discharge pipe 7 Fresh water supply pipe 8, 9 Water supply pipe 10 Washing water discharge pipe 11 Overhead rail 12 Tact type conveying device

Claims (4)

A chemical treatment tank and a plurality of water washing tanks arranged in series in front of the chemical treatment tank with respect to the traveling direction of the object to be processed are provided, and the water washing tank is in the middle of the pipe and the pipe from the washing tank to the spray nozzle. A pre-painting treatment device in which the wash water overflowed from the front washing tank is forwardly fed to the rear washing tank, and the washing water overflowed from the washing tank is placed immediately behind the washing tank. A pretreatment apparatus for painting comprising a pipe for supplying to a suction port of a circulation pump of the paint pump. The pretreatment device for painting according to claim 1, wherein the circulation pump is disposed below the water surface of the washing tank. The electrodeposition tank and a plurality of water washing tanks arranged in series in front of the electrodeposition tank with respect to the traveling direction of the object to be processed are provided, and the water washing tank is in the middle of the pipe and the pipe from the water washing tank to the spray nozzle. An electrodeposition coating apparatus having a circulation pump disposed and having the wash water overflowed from the front water washing tank forwarded to the rear water washing tank, wherein the washing water overflowed from the water washing tank is immediately behind the water washing tank An electrodeposition coating apparatus comprising a pipe for supplying to a suction port of a circulation pump included in the apparatus. The electrodeposition coating apparatus according to claim 3, wherein the circulation pump is disposed below the water surface of the washing tank.

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