JPS606442Y2 - Water washing equipment for electrodeposition coating - Google Patents

Description

[Detailed description of the invention] This invention relates to a water-washing station for coating.

Generally, in an electrodeposition coating line, next to the electrodeposition tank, there is an overflow tank, a primary washing tank, a secondary washing tank...
The washing water from the washing tank is sent via a pump to the Java nozzle installed above the washing tank, and the object to be coated is washed with the washing water sprayed from this Java nozzle, and the water inside the electrodeposition bath is The liquor liquor discharged from the ultrafiltration device that manages the composition is supplied to the shirt nozzle, and the liquor liquor is also washed with water, and then the article to be coated is completely immersed in a dip washing tank and washed with water.

In dip washing, fresh washing water is replenished and a portion of the washing water in the dripping tank is drained.

Then, the paints and solvents contained in this wastewater are treated with wastewater treatment equipment, making it into clean water and discharging it into the sea.

Currently, wastewater treatment equipment coagulates paint, but treats solvents using bacteria, which takes time.

Therefore, the treatment capacity of a wastewater treatment device depends on the amount of solvent brought in.

Therefore, the present invention was developed with the aim of minimizing the amount of solvent that adheres to the object to be coated and is carried from the shirt washing process to the dip washing process, and as a result, reduces the amount of solvent that is carried into the wastewater treatment equipment. It is.

There are two cases in which solvent is brought into the dip washing process.The two cases are cases in which the solvent is taken out from the electrodeposition bath after adhering to the object to be coated and is brought into the dip washing process without being washed in the Java washing process. There are cases where the solvent in the sake liquor adheres to the object to be coated and is carried into the dip washing process.

The aim of this invention is to reduce the amount of solvent used in both cases.In addition to reducing the amount of solvent in the furnace liquid used for washing, it also improves the washing effect in the Java washing process, and it also improves the washing effect in the Java washing process. This method is characterized by reducing the amount of solvent carried into the dip washing process.

That is, by heating the furnace fluid, the amount of solvent in the furnace fluid used for washing is reduced, and the heated furnace fluid is used to wash with water, thereby improving the washing effect of the object to be coated.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an example of an electrocoating line for automobile bodies shown in the drawings.

Next to the electrodeposition tank 1, an overflow tank 2, a rinsing tank 3.4, and a dip rinsing tank 5 are connected, and above each type there are Java nozzles 6, 7. 8. 9, and above the washing tank 4, a furnace liquid Java nozzle 10 is further disposed.

The Java nozzles 6 and 7.8 receive the washing water from the washing tanks 3 and 4.
Java nozzle 9 has fresh washing water, Java nozzle 10
is supplied with furnace liquid, which will be described later.

A portion of the washing water in the dip washing tank 5 is sent to a wastewater treatment device 12 via a discharge pipe 11, where it is made into clean water and discharged into the sea or the like.

An ultrafiltration device 13 is connected to the electrodeposition tank 1 through a passage 14, and the ultrafiltration device 13 separates the liquid discharged from the electrodeposition tank 1 into a paint component and a furnace liquid. The composition in the electrodeposition bath is controlled by returning it to the electrodeposition bath 1 via the electrodeposition bath 15.

Further, the furnace liquid from the ultrafiltration device 1-3 is supplied to the furnace liquid supply device 1.
From the furnace liquid tank 17, it is supplied to the Java nozzle 10 via the furnace liquid pipe 19 of the furnace liquid supply device 16 by the furnace liquid pump 18.

A heater tube 21 of the heater 20 is guided into the furnace liquid tank 17, and the furnace liquid is heated with steam or high-temperature water in the heater tube 21.

Reference numeral 22 denotes a flow rate control valve, which adjusts the flow rate based on a signal from a temperature sensor 23 that detects the temperature of the furnace liquid in the furnace liquid tank 17, thereby controlling the temperature of the furnace liquid to a value within a predetermined range. are doing.

Next, we will discuss the operation.

The object to be coated (not shown) taken out from the electrodeposition tank 1 is washed with washing water spouted from the Java nozzles 6, 7.8, and then washed with furnace liquid sprayed from the Java nozzle 1o.

Since this furnace liquid is obtained by heating the furnace liquid in the furnace liquid tank 17 with the heater 16 to evaporate the solvent, washing with the furnace liquid can prevent the solvent from newly adhering to the object to be coated. .

At the same time, since the object to be coated is cleaned with heated furnace liquid, the cleaning effect of the object to be coated is excellent, and solvents etc. adhering to the object to be coated are thoroughly washed away.

Then, the object to be coated is completely immersed in the dip washing tank 5 and washed with water, but since the solvent adhering to the object to be coated is washed off as much as possible in the previous step, the amount of solvent brought into the dip washing tank 5 is extremely small.

Therefore, less solvent is brought into the wastewater treatment device 12.

In addition, after the dip water washing process, water washing is further performed with a Java nozzle 9 to complete the water washing process.

In this embodiment, the furnace liquid in the furnace liquid tank 17 is heated, but the heating is not limited to this. For example, the furnace liquid in the furnace liquid pipe 19 is heated.
The method of heating is not limited to this example, and heating may be performed electrically.

As described above, in this invention, the furnace fluid used for washing is heated to evaporate the solvent in the furnace fluid, and the heated furnace fluid is used to clean the object to be coated. Additionally, the amount of adhering solvent can be reduced, and the adhering solvent can be thoroughly washed off.

[Brief explanation of the drawing]

The drawings are process diagrams showing one embodiment of the present invention. 1...Electrodeposition tank, 2...Overflow tank, 3゜4...Washing tank, 5...Dip washing tank, 6,7゜8.9,10...Tsuyawa nozzle, 113...Ultrafiltration device, 16...
・Filtration supply device, 17... Furnace liquid tank, 19.
...Furnace liquid tube, 20...Heater.

Claims (1)

[Scope of utility model registration request] A Java nozzle that sprays rinsing water onto the object to be coated taken out from the electrodeposition bath, a rinsing tank that is placed below the nozzle and houses the water that has been sprayed by the nozzle for circulation, and a limiter that controls the composition in the electrodeposition bath. A liquor supply device having an outer filtration device, a liquor tank for storing liquor from the ultrafiltration device, and a liquor pipe for supplying the liquor in the tank to a Java nozzle, and a liquor supply device in the furnace liquor supply device. A heater that heats the liquor to evaporate the solvent in the liquor, a temperature sensor that detects the temperature of the liquor heated by the heater, and a signal from the temperature sensor to control the temperature of the liquor in the liquor supply device. A water washing device for electrodeposition coating, comprising a control device that performs control so that the value falls within a predetermined range, and is configured to reduce the amount of solvent in liquor used for washing.