JPH025903Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Application of the Invention) The present invention relates to a coating device for a workpiece 1 having one end open and the other end closed.

(Background of the invention) In order to apply the coating to the surface of the object 1 having the shape described above and to avoid coating the inner surface, the object 1 is dipped into the coating material 3 with the open end facing down, and then The lifting method is suitable. In that case, when the object 1 to be coated is immersed in the paint 3, the air inside the object may expand due to a slight temperature difference between the coating liquid and the external temperature, and the solvent of the coating liquid may evaporate inside the object. Due to an increase in volume, bubbles may be generated from below during pulling up, resulting in uneven coating.

In order to prevent this, it is recommended to remove part of the air trapped inside the object to be coated.
It is disclosed in Publication No. 74170. the device to the second
and Fig. 3. In these figures,
The object to be coated 1 suspended by a hanging tool (such as a chuck) 4 is moved up and down by lifting devices 5 and 6. A paint tank 2 contains a paint 3, and a ventilation pipe 7 and a rubber air chamber 12 connected thereto.
is installed. FIG. 3 shows the state in which the object 1 to be coated is immersed.

In this immersed state, the air pressure in the inner cavity of the object to be coated 1 increases, and therefore the air chamber 12 made of rubber, which is communicated with this inner cavity through the ventilation pipe 7,
In addition, a portion of the air escapes, thereby eliminating the above-mentioned problems such as the generation of bubbles.

However, it has been found that there are some points that should be further improved regarding the coating apparatus having such a configuration.

In other words, in this coating device, paint does not enter the vent pipe during the normal coating process, but when refilling the paint or adjusting the immersion height, paint does not enter the vent pipe. Sometimes I get tired. If paint enters the vent pipe, the pipe becomes clogged, causing inconvenience, but the reality is that it is not easy to remove the clogged paint.

(Purpose of the invention) The present invention has been made for the purpose of structurally eliminating clogging of the ventilation pipe in the above-mentioned coating apparatus, reducing the need for inspection of the apparatus, and realizing continuous long-term use.

(Summary of the invention) Therefore, the gist of the present invention, which was made to achieve the above object, is to apply a coated object having one end open and the other end closed. , a coating device configured to form a coating film on the surface of an object to be coated by immersing the paint in a paint tank with one end facing downward and then pulling it up; is characterized in that it is provided with a ventilation pipe for air removal extending from the bottom of the tank above the surface of the paint, and the lower end of this ventilation pipe is connected to a paint reservoir having a branched ventilation path and an outlet. There is a coating device that does this.

(Embodiment of the invention) An embodiment of the invention will be described based on FIG. This is the same as shown in .

The feature of this embodiment is that the lower end of the tank 2 of the ventilation pipe 7 is branched, and apart from the ventilation path for removing air from the contents of the object to be coated 1, the ventilation pipe 7 is arranged in a substantially vertical position. This is because the lower end is connected to the paint reservoir 8 directly below.

According to such a configuration, even if paint enters the interior from the upper end of the ventilation pipe 7 for some reason as described above, the paint that has entered the ventilation pipe will be collected in the container 8 and the ventilation pipe will be closed. It does not get clogged, so it provides an effect that does not interfere with the coating work. When the amount of paint in the container increases,
Alternatively, the accumulated paint can be easily taken out by opening the valve 9 at the bottom of the container 8 and taking out the paint at a time when no coating work is to be performed.

As a method for removing a portion of the air, a rubber air chamber may be used as described above, but in this example, a liquid tank is used so that the amount of air to be removed can be more easily adjusted. I am trying to use . That is, the tip of the vent pipe, which is branched off from the container 8, is inserted into the liquid 11 in the liquid tank 10, and the head pressure of the liquid 11 is used to remove air. According to this, by adjusting the length of the vent pipe inserted into the liquid, the pressure can be changed and air at a pressure higher than that can be removed, and the advantage is that the pressure can be easily adjusted. be. As the liquid 11, an appropriate liquid such as water or oil may be used.

(Effect of the invention) According to the application device of the invention, the upper part is closed;
Not only is it possible to dip-coat paint onto objects that are open at the bottom without generating bubbles, but even if paint gets inside the ventilation pipe,
There is no need to interrupt the coating operation, and furthermore, it is possible to easily take out the paint that has entered the vent pipe, which is extremely beneficial to the operation.

[Brief explanation of the drawing]

FIG. 1 is a front view including a partial cross section of a coating device showing an embodiment of the present invention, FIGS. 2 and 3 are views showing conventional coating devices, and FIG. Before immersion, FIG. 3 shows the state during immersion. 1: Object to be coated, 2: Paint tank, 3: Paint, 4: Hanging tool, 5, 6: Lifting device, 7: Ventilation pipe, 8: Container, 9: Valve, 10: Liquid tank, 11: Liquid.

Claims (1)

[Scope of utility model registration request] By immersing the object to be coated, which has one end open and the other end closed, in a paint tank with the one end facing downward, and then pulling it up. The coating device is configured to form a coating film on the surface of an object to be coated, and the coating tank is provided with a ventilation pipe for air vent extending from the bottom of the tank above the surface of the paint, and the ventilation pipe A coating device characterized in that the lower end of the device is connected to a paint reservoir having a branched air passage and a paint discharge port.