JPH02216377A - How to clean transport hangers in the automobile painting process - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for cleaning conveyance/permeability in an automobile painting process.

[Prior Art] A conventional automobile painting process is carried out as shown in FIG. In other words, the car body is loaded onto a conveyor (31), the car body with the hanger is moved inside the paint booth, and pre-treatment processes such as degreasing and chemical conversion are carried out (31).
32) Electrodeposition coating process (
33), a baking process (34) for baking the electrodeposited coating film, a PVC sol painting process (35) for applying a vinyl chloride resin sol for undercoating to the car body, and finally, the car body is lowered from the hanger. (36) The painting of - car bodies is completed. Then, unpainted automobiles are loaded one after another onto the transport hanger, and by repeating the above steps, a large number of automobile bodies are continuously painted.

By the way, as shown in FIG. 3, the PVC sol coating process is carried out on the automobile body (
This is done by applying vinyl chloride resin sol (hereinafter referred to as vinyl chloride sol) from the bottom surface of A).

[Problems to be Solved by the Invention] In the conventional PVC sol coating process, since the coating is applied from the lower surface of the transport hanger, the PVC sol (B) also adheres to the lower surface of the hanger.

If there is vinyl chloride sol attached to this hanger (H), the following problems will occur in the next car body painting process.

■Increase in defects on the body surface due to PVC sol brought into the pre-treatment process and electrodeposition painting process.

■ Degreasing power is reduced due to PVC sol being carried into the degreasing tank during the pre-treatment process.

■Failure to install the car body due to PVC sol adhering to the hanger.

In view of such circumstances, an object of the present invention is to provide a method for removing vinyl chloride sol attached to a hanger.

[Means for Solving the Problems] The method of cleaning a transport hanger in an automobile painting process of the present invention includes a process of mounting an automobile body on a transport hanger, a pretreatment process, an electrodeposition coating process, an electrodeposition coating baking process, and a transport hanger. A process of applying vinyl chloride resin sol to the car body from below, a process of lowering the car body from the transport hanger, and a hanger cleaning process of removing the vinyl chloride resin sol attached in the previous process from the transport hanger are carried out in that order, The hanger cleaning step is characterized in that the hanger cleaning step is performed by spraying warm water onto the conveyance hanger.

In the present specification, the term "vinyl chloride resin sol" refers to a vinyl chloride resin sol for undercoat having plastisol of vinyl chloride resin as the main resin component.

[Function] In the present invention, before starting the next car body painting process, the PVC sol adhering to the transport hanger is washed off.
There is no inconvenience caused by bringing the PVC sol into the next process.

Furthermore, the method of the present invention is characterized in that it can be implemented by being installed on a conveyor path that is smaller than the conventional method, and that it is extremely safe because hot water is used.

[Example] Next, the present invention will be explained in detail.

FIG. 1 is an explanatory diagram of a painting line that implements the method of the present invention;
FIG. 2 is an explanatory diagram of a hot water washing booth, FIG. 3 is an explanatory diagram of a vinyl chloride sol painting process, and FIG. 4 is a block diagram of a conventional automobile painting process.

In FIG. 1, (L) indicates the movement path of the conveyance hanger (11). (1) is the place where the car body is loaded onto the transport hanger, (2) is the pretreatment, (3) is the electrodeposition coating, (4) is the baking, (5) is the PVC sol painting, and (6) is the place where the car body is placed. This is the place to unload from the transport hanger. The above configuration is basically the same as conventional painting.

The cleaning apparatus for carrying out the method of the present invention is characterized by the following points. (7) and (8) are hot water wash booths, and (9) is an air blower, which are provided between the lowering location (6) and the mounting location (1). The empty transport hanger from which the car body was unloaded at location (6) is placed in the hot water wash booth (7) and the hot water wash booth (
8) and the air blow booth (9). 01), 02), ■ are stoppers for stopping the conveyance hanger at each booth.

The basic configuration of the hot water washing booths (7) and (8) is shown in FIG. The hot water in the tank (B) is sucked up by the pump 4, and is sprayed from both the top and bottom of the hanger (II) from the nozzle (G). The temperature of hot water, the spraying pressure, and the cleaning time may be arbitrarily determined experimentally, but for example, hot water at 80° C. is used twice at a pressure of 2 to 5 kg/c for 0.8 minutes/stage.

During cleaning, the hanger (H) may be stopped;
You can move slowly. In the example, the hot water washing stage is 2.
There are several locations, but if cleaning is done thoroughly,
One place is fine.

The hot water sprayed from the nozzle η passes through the drain pipe surface and is collected together with the removed PVC sol into the tank 04).

Since the vinyl chloride sol precipitates in the tank 04), separation of the hot water and the vinyl chloride sol can be easily performed.

After removing the vinyl chloride sol in the hot water washing booths (7) and (8), the bricks are dried in the air blow booth (9) and then moved to the mounting location (1) on the automobile body.

Then, the next car body is mounted there, and the car body is painted again in the same way.

As described above, the present invention removes the vinyl chloride sol from the transport hanger before entering the next process, which eliminates the inconvenience caused by bringing the vinyl chloride sol into the next process, and has the following advantages.

■Easy to handle compared to the method of spraying high-pressure water.

■If chemicals are used, there are safety issues and they must be processed outside the painting line, but the present invention is safe and can be incorporated into the painting line.

■The equipment is simpler and the cleanup is easier than when using the shot blasting method.

[Effect of the invention] According to the present invention, the following effects can be achieved.

■No defects occur due to PVC sol being brought into the pre-treatment process or electrodeposition coating process.

■Since PVC sol is not carried into the degreasing tank in the pre-treatment process, the degreasing power in the degreasing tank does not decrease.

■Since there is no large amount of PVC sol attached to the hanger, there will be no installation defects on the car body.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a painting line that implements the method of the present invention;
FIG. 2 is an explanatory diagram of a hot water washing booth, FIG. 3 is an explanatory diagram of a vinyl chloride sol painting process, and FIG. 4 is a block diagram of a conventional automobile painting process. (Main symbols in the drawing) (1): Automobile body mounting location (2): Pretreatment booth (3): (4): (5): (6): (Crab (8): (9): Electrodeposition coating Booth Electrodeposition painting baking booth PVC sol painting booth Automobile body lowering area Hot water washing booth Hot water washing booth Air blow booth Figure 1

Claims (1)

[Scope of Claims] 1. A step of mounting an automobile body on a transfer hanger, a pretreatment step, an electrodeposition coating step, an electrodeposition coating baking step, a step of applying vinyl chloride resin sol to the automobile body from below the transfer hanger, A step of lowering the automobile body from the transport hanger and a hanger cleaning step of removing the vinyl chloride resin sol attached in the previous step from the transport hanger are performed in that order, and the hanger washing step is performed by spraying hot water onto the transport hanger. A method for cleaning a transport hanger in an automobile painting process, characterized in that: