JPS58100693A - Washing and showering method for recovering electrodeposition paint - Google Patents

Abstract

PURPOSE:To reduce defective painting and the loss of paint in the stage of recovering the unelectrodeposited paint on the surface of substrates by performing showering continuously by detecting the substrates during operation and doing the same intermittently while not in operation. CONSTITUTION:When a substrate 4 mounted on a hanger 3 is conveyed by a conveyor 2 in a washing chamber 1 as a recovering and washing zone in the stage of operation, the substrate 4 is detected before the same enters the chamber 1, and a solenoid valve 5 is opened. Then the washing water 9 in a washing water tank 8 is pumped 10 by as much as the rate set by valves 11 and is showered through nozzles 7 toward the substrate 4. The falling water returns into the tank 8 and is showered by circulating through a wire net strainer 15 and a precision filter 16. The valve 5 is closed by the signal confirming the passage of the substrate 4 through the chamber 1. While not in operation, the valve 5 is opened and closed at set time intervals by the stop signal of the conveyor 2, to shower the inside of the chamber 1 intermittently, whereby the flocculation of the paint in the chamber 1 and the drying thereof are prevented.

Description

[Detailed Description of the Invention] The present invention F! , Deposition of paint components in the recovery water washing system equipment for unelectrodeposited paint on the surface of the coated object after electrodeposition painting.

This relates to a method for preventing flocculation and sedimentation.

Today, it is widely adopted in industry. In electrodeposition coating, as a subsequent step, multiple washing zones are provided and water washing with Java is performed in order to collect unelectrodeposited paint on the surface of the object to be coated.

This rinsing water is pumped up from the rinsing water tank provided in each rinsing zone, washes the W-coated objects with Java water, and then returns to the tank. Also.

The electrocoating paint components filtered from the ultrafiltration device, which pipes pure water and the components in the electrodeposition tank, are supplied to the washing tank on the latter stage, and the overflow is carried out from the washing tank on the latter stage to the washing tank on the front stage in order. By returning a portion of the washing water, the concentration of paint components in the washing water tank is gradually lowered from the front side, and the non-electrodeposited paint on the surface of the object to be coated can be quickly washed and collected. Then, from the water washing tank at the frontmost stage, a pump returns the highly concentrated liquid to the electrodeposition water tank or the overflow tank immediately after the electrodeposition tank.

When the W is open, in each washing zone, the inside of the washing chamber is constantly dripping due to the operation of the washing java, but when it is not in operation, especially on holidays, the inside of the washing chamber dries out, and as mentioned earlier, Secondly, the washing water contains paint components, and the washing water adhering to the chamber evaporates, causing the paint components to stick or aggregate. These fall off during the next operation due to the flush water java, and return to the flush water tank while being mixed with the flush water.

Also, inside the washing water tank, the liquid that has been simmering in the washing chamber returns to the tank.

Although the washing water is designed to be circulated, it is included in the washing water. Circulation of washing water alone is not sufficient to prevent sedimentation of electrodeposited paint components, and a large amount of paint components coagulate and settle at the bottom of the washing tank.

As stated above. Adhesives and aggregates generated in the washing chamber and mixed into the washing water, or aggregates and sediments generated in the washing water tank, are sucked into the washing water java pump, journed onto the object to be coated, and then deposited on the surface of the object. This will cause paint to stick and cause scissor defects such as paint bubbling. To avoid this unnecessary painting.

A wire mesh strainer, precision filter, etc. are installed on the discharge side of the pump to filter out the dirt, but they clog quickly and require frequent cleaning and replacement, resulting in high maintenance costs and a high loss of paint. .

Main departure +11. In electrodeposition coating. A recovery washing equipment system for recovering unelectrodeposited paint on the surface of the object to be coated, that is, a washing chamber that performs washing Java and a washing water tank that stores washing water.This system effectively circulates and stirs the washing water. The purpose is to eliminate the occurrence of paint spots due to paint drying, agglomeration, and sedimentation within the tank, and to reduce paint defects and paint loss.

In order to achieve this objective, 1. In the water washing Java method of the present invention for recovering and washing with water the unelectrodeposited paint on the surface of the object to be coated after electrodeposition coating, the water washing method is carried out continuously during operation. The machine detects the object to be coated and performs jawing, and during non-operation, intermittent jawing is performed at time intervals set according to the properties of the paint used, with the aim of drying the inside of the washing chamber and preventing paint agglomeration and buildup. It will be done.

In addition, in the flush water tank that stores Java water, the liquid in the tank is circulated and sprayed vertically or diagonally to the bottom of the tank from multiple nozzles in order to agitate the liquid in the tank and prevent paint from settling on the bottom of the tank. Ru. Alternatively, a stirrer that directly stirs the tank liquid may be used in conjunction with the tank liquid.

In addition, the washing water that is circulated and spouted to the bottom of the washing water tank may be water from a circulation system separate from the washing shirt in the washing chamber, or a part of the washing water sent to the washing java. You can return the tube and use it.

By the above method, the intermittent java during non-operation prevents the agglomeration and accumulation of paint in the flushing chamber, as well as the resulting paint spots, and also prevents the flushing water tank by spouting circulating water against the bottom of the flushing water tank. This prevents coagulum and the like from settling on the bottom surface, ultimately preventing the occurrence of coating defects.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the water-washing Java method for recovering electrodeposited paint according to the present invention will be described below with reference to all the drawings.

FIG. 1 shows an apparatus to which a method according to a first embodiment of the present invention is applied. When W is open 1 Collection Washing chamber 1 as washing zone 1 When the workpiece 4 loaded onto the hanger 3 is conveyed to the hanger 3 by the internal pressure conveyor 2, the workpiece 4t is detected before entering the washing chamber 1 and an electromagnetic The valve 5 is activated and opened, and the object to be coated 4 enters the water washing chamber 1 of the shaft 9 piping 6.
From the nozzle 7 attached with a suitable corner [1], the washing water 9 in the washing water tank 8 is pumped by a pump 10tC, and is jawed by a set amount from the pulp lIK toward the object 4 to be coated. 4 tons of Java-coated object - washed down water i
j, returns to the rinsing water tank 8 through the droplet ν provided at the bottom @ of the rinsing chamber 1. Then, the electromagnetic valve 5 is closed by the signal 11g of the object 4 passing through the recovery washing zone. The pump 10 is always operated continuously, and when the solenoid valve 5 is closed, the flow rate set by the relief pulp 13 returns to the washing water tank 8 through the return pipe 14. This relief pulp 13 tj is always open, so when the solenoid valve 5 is open, the
．． A certain amount is in the return line ta. In addition, the Java piping 6 system has a wire mesh strainer 15. Precision filter 161:
By removing paint aggregates and foreign matter, you can produce washing water with better properties. Note that the water washing jaw may not only be performed while the coated fist 4 is passing through the water washing chamber 1, but also may be continuously performed at all times while the apparatus is in operation, even when the fist 4 is not passing through the water washing chamber 1.

When not in operation, in the equipment system mentioned above, the stop signal of the conveyor 2 activates a separately provided solenoid valve opening/closing timer, opens and closes the solenoid valve 5 at preset 9 hour intervals, Intermittently works to prevent paint from clumping and drying in washing chamber 1. Note that when not in operation, the solenoid valve 5 may be kept open at all times, and the pump 10t-ON-〇FF operation may be performed intermittently for java at time intervals set by a timer.

Next, a second embodiment of the present invention will be described with reference to FIG.

The flushing water 9 stored in the flushing water tank 8 is supplied to the circulation pump 1
0' K, passes through the washing water circulation pipe 141, and is ejected from the agitation nozzle 17 directed vertically or diagonally toward the bottom of the washing water tank 8, thereby coating the bottom of the washing water tank 8. Prevents flocculation and sedimentation.

In addition, as a third embodiment, an agitator 18 having an electric, pressure, or air rotation mechanism is installed on the top 11 of the washing water tank 8.
The washing water may be stirred by 9 Fi of stirring.

The concentration of the wash water paint in the wash water tank 8 becomes uniform, and no agglomeration occurs.

In addition, in the second and third embodiments, it is more effective if the bottom of the flush water tank 8 is sloped downward relative to the suction port of the circulation pump 101. Further, the circulation pump 10 may be operated constantly depending on the sedimentation properties of the paint components contained in the washing water 9, or may be operated intermittently at time intervals of t set in advance by a timer.

Part. As a fourth embodiment, as shown in FIG. 2, the flushing water circulating in the flushing water tank 8 is constructed in a separate system from the flushing water sent into the flushing chamber 1.

A pump 10' constantly or intermittently spouts a fixed amount of washing water to the bottom 8 of the washing tank WJK.

Next Kf! , 5 Example t-@3 will be explained according to FIG.

The fifth embodiment is a combination of the methods shown in the first embodiment and the second embodiment. During operation, 9 t of flush water in the flush water tank 8 is sucked into the constantly operating pump 10@, and the Java piping 6 When the electromagnetic valve 5 is opened, the amount of fiL'jL adjusted by the pulp 11 is applied to the object 4 from the nozzle 7. Further, the shirt pipe 6 is branched from before the solenoid valve 5.

A circulation pipe 14" with a stirring nozzle 17 and a stirring nozzle 14" directed directly or diagonally toward the bottom of the flush water tank 8.
The relief valve is adjusted quickly to allow it to flow. When the solenoid valve 5 is closed, the entire amount of Fi pumped by the pump 101 passes through the circulation pipe 14" and is ejected from the bottom stirring nozzle 17. When the solenoid valve 5 is closed, the pump 101 is always operated and the solenoid valve is closed. 5 is opened and closed at time intervals set by a timer.

Either perform intermittent flushing in the flushing chamber 1 and constantly circulate and spray the flushing water 9 in the flushing water tank 8 to the bottom of the flushing water tank 8 in the same way as when the pump 1 is in operation.
01 is 0N-OFF at the time interval set by the timer
? By keeping the electromagnetic valve 5 open at all times, intermittent jawing is performed in the flushing chamber 1, and the flushing water 9 is intermittently circulated and spouted to the bottom of the flushing water tank 8.

Stirrer 18F! Depending on the properties of the paint in the washing water, both during operation and non-operation, the operation may be continuous or intermittently. The fact that it is better to provide the precision filter 16 is the same as the explanation in the @1 embodiment, and it is more effective if the bottom of the flush water tank 8 is sloped downward toward the suction port of the pump 10'. This is the same as the description of the second embodiment.

In addition, as for how to set the time for intermittent operation of Java in the water washing chamber 1 in Fig. wJ1 and Fig. 3, 6 normal c.
You can run java for 2-5 minutes once every 30 minutes to 1 hour, but this can be done by preventing the java washing water from drying on the inner wall of the chamber, as it will be affected by temperature and humidity. Il! It is not limited to i.

As described above, 1. When using the 7 methods of the present invention,
Recovery of unelectrodeposited paint on the surface of the object to be coated after electrodeposition In the washing system equipment, when the inside of the washing chamber is not in operation, intermittent jabbing with washing water is performed to prevent drying and paint buildup inside the washing chamber. In addition, several nozzles are used to spray the liquid in the tank to the bottom of the wash water tank that stores the wash water of the 1-recovery wash to prevent paint from settling and accumulating on the bottom. The occurrence of paint agglomerates, so-called paint spots, is significantly reduced, and paint quality defects such as spots caused when paint spots are baked and dried on the surface of the object to be coated are eliminated. The effect is that the strainer and filter are less likely to become clogged, and maintenance costs associated with their replacement can be reduced.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an electrodeposition paint recovery flushing Java main electrolyte equipped with an intermittent jawing mechanism in the flushing chamber during non-operation according to a first embodiment of the present invention. FIG. 2 is a cross-sectional view of a washing water ring agitation device in a washing water tank for recovering electrodeposited materials, which is equipped with a mechanism for preventing coagulation and sedimentation of paint in washing water, according to a second practical example to a fourth practical example of the present invention. Figure 3 is a cross-section of an intermittent jaw, circulation, and agitation device for electrocoating paint collection and washing water equipped with a mechanism kA for preventing drying of the electrocoating (b) water collection and washing system equipment and preventing paint sedimentation and accumulation, according to the fifth implementation visit of the present invention. figure. It is. l...Fist/washing chamber. 4... Object to be coated. 5... Solenoid valve. 6*...Java piping. 7e...-Nozzle 8--#Q flush water tank. 9...0 Rinse water. 10.10', 1Φ0・Pump. ■... 11th road exit. 17... Stirring nozzle. 18... Stirrer. Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] (1) Along with circulating running water and washing water. Rinsing water is sent from the washing water tank to the washing chamber 9, and is flowed onto the surface of the object passing through the washing chamber, and the non-electrodeposited paint is collected into the washing water tank. Inside the washing chamber, the java may be performed continuously, but the java is performed by detecting the object to be coated, and the java is performed intermittently at time intervals that can prevent drying and paint agglomeration in the washing chamber in relation to the paint used during non-operation. A water-washing Java method for recovering electrodeposited paint. (2. Scope of Claims @ In the electrocoating paint recovery washing Java method according to item 1, the washing water in the circulating washing water tank is circulated and spouted against the bottom surface of the washing water tank. (3) Claims In the electrocoating paint recovery washing Java method described in item 'lI/c1, the washing water in the circulating washing water tank is circulated and spouted to the bottom l1jVC of the washing water tank, and the washing water in the washing urine tank is mechanically (4) @Claim 2 also refers to the washing water shirt method for recovering electrocoated paint according to any one of paragraph 3, in which washing water is circulated and spouted to the bottom of the washing water tank. (5) In the electrocoating paint recovery washing water method according to any one of claims 2, 1 or 3, washing water from a circulation system different from the washing water is used. A portion of the washing water sent to the washing Java is used as the washing water that is circulated and spouted to the bottom of the water tank.