JPS6021783B2 - Hanger for dip painting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hanger used in an immersion coating device that performs coating by submerging the object to be coated in a paint tank.

Conventionally, for example, in electrodeposition coating, as shown in FIG. The paint was soaked in the paint tank 4 and then taken out to dry.

In addition, in electrodeposition coating, there is a wire between the iron paint tank or the anode plate installed in the paint tank and the cable 1.
A DC voltage of about 0.00 to 400 volts is applied to cause the dew-deposition reaction. However, in the conventional lightning coating equipment as described above, the workpiece 3 suspended from the hanger 2 is soaked in the paint in the paint tank 4, so products with complex shapes or deep-drawn products are coated. In this case, as shown in FIG. 1, air may accumulate inside the product (object to be painted 3), and there is a risk that the paint will not adhere to that part and leave it unpainted.

For this reason, conventionally, an air vent hole 5 is formed in the object 3 to be painted so that when the object is immersed in paint, the internal air escapes through the air vent hole 5 and the paint is applied to the entire surface. After drying, the air vent hole 5 was plugged with a stopper 6 made of rubber or the like as shown in FIG. In this way, in conventional military uniform painting, air vent holes must be formed in the object to be painted in advance and these holes must be plugged after painting, which is very troublesome, and the appearance quality is affected by the appearance of air holes on the surface of the product. There was a drawback that the value decreased. This invention was made by focusing on the above-mentioned drawbacks.The hanger for suspending the object to be painted is formed from a hollow pipe, and the air inside the object to be painted is released into the atmosphere through the hanger using the hydraulic pressure of the paint. This eliminates the need for air vent holes and plugs for the product, and furthermore, by providing a check valve at the bottom of the hanger, the paint accumulated in the hanger can be discharged and used repeatedly.

The present invention will be explained below based on the drawings.

FIG. 3 shows an embodiment of the present invention, and the same parts and parts as those of the conventional device shown in FIG. 1 are given the same reference numerals, and redundant explanation will be omitted.

In this embodiment, the cable 11 is suspended from the hanger 2.
The external shape is hook-shaped like the conventional one, but
The inside thereof is formed in a hollow shape, and the ends of the upper end portion 2a on the fixed side and the end portions of the hook portion 2b are each closed.

Further, as shown in FIG. 4, a valve seat 7 is fixed to the lower end 2c of the hanger 2, and a check valve 8 formed of a thin rubber film of about 1 to 2 skin thickness is mounted on this valve seat 7. One end is fixed, and this check valve 8 is closed in response to hydraulic pressure in the paint. When the object 3 to be coated is immersed in the paint tank 4, the hanger 2 always has its upper end 2a protruding above the liquid level of the paint. Therefore, according to the above-mentioned hanger 2, as shown in FIG. 3, the air inside the object to be painted 3 immersed in the paint passes through the inside of the hanger 2 under the hydraulic pressure of the paint and exits from the entrance at the upper end 2a. be discharged.

Therefore, even if the object 3 to be painted has a complicated shape or is a deep-drawn product, all the air inside the object 3 will escape and the paint will adhere to the entire surface. Moreover, since the check valve 8 is provided at the lower end 2c of the hanger 2, even if paint infiltrates into the hanger 2 through the opening of the hook part 2b, when the hanger 2 is lifted from the paint tank 4, Since the paint accumulated in the hanger 2 is discharged from the check valve 8, it can be continuously and repeatedly used in the painting line. In the above embodiment, a case where the present invention is applied to a tortoise coating line has been described, but the present invention can also be applied to other coating apparatuses that perform coating by dipping the object to be coated in a ditch during coating.

As explained above, the present invention uses the above-mentioned hanger in an immersion coating apparatus that performs painting by hooking the object to be coated on a hanger suspended from a cable transported along a coating line and submerging it in a paint tank. Since it is formed in a hollow shape with both ends open, by making the upper end of the fixed side of the hanger protrude above the liquid level of the paint tank, air inside the object to be painted can be exhausted and the entire surface can be coated. In addition to being able to paint over a wide range of surfaces, the troublesome drilling of holes in the product and the installation of filler plugs are no longer necessary, and the quality of the product's appearance is improved.

Further, by providing a check valve at the lower end of the hanger that is closed by the hydraulic pressure of the paint, it is possible to use the hanger continuously and repeatedly in a painting line. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic explanatory diagram showing a state of infiltration by a conventional drape coating device, Fig. 2 is a cross-sectional explanatory diagram showing a conventional object to be coated, and Fig. 3 is a diagram showing a hanger according to the present invention. FIG. 4 is an enlarged sectional view showing an example of a check valve provided at the lower end of the hanger.

1...Cable, 2...Hanger, 3...
...Object to be painted, 4...Paint tank, 8...
··non-return valve.

Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. In a dip coating equipment where the object to be coated is hooked onto a hanger that is suspended from a cable that is transported along a painting line and then immersed in a paint tank for painting, the upper hanger is suspended from the cable. Consisting of a main body part and a hook part that branches from the main body part and penetrates into the object to be coated,
Further, both ends of the main body part and the tip of the hook part are formed in a hollow shape with openings, and the lower end of the main body part is closed by the hydraulic pressure of the paint in the paint tank. A hanger for dip coating that is equipped with a check valve that opens when lifted from a paint tank.