JPS5857232B2 - Tategatarenzokushikifuntaitosou booth - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical continuous powder coating booth used for applying powder coatings.

Conventionally, when applying various powder coatings, the object to be coated is preheated, or the powder coating is electrostatically charged and then applied to the object, but this requires relatively large equipment. Not only does it require a separate paint booth (painting booth), but it is also extremely difficult to change the color of powder paint, and it is necessary to prepare enough paint booths for each color of powder paint to be used. Sometimes I had to.

It was also considered that the tunnel (cylindrical body) was particularly long horizontally, but even with this, the paint adhesion efficiency was 85% by weight.
It never exceeded.

In view of the above-mentioned current situation, the present inventors have conducted various studies in order to obtain a coating booth that does not have the above-mentioned drawbacks. As a result, the conventional coating booth is of a horizontal type. Based on the recognition that no significant effect can be obtained even if the tunnel is made particularly long (as mentioned above), as a result of various studies, surprisingly, if the tunnel is made vertical, a surprising result can be obtained. They found that the paint adhesion efficiency showed an unexpected increase, and as a result of further research, they completed the present invention.

That is, the present invention provides a vertical cylinder, a workpiece inlet at the lower part of the cylinder, a workpiece outlet at the upper part of the cylinder, and a workpiece outlet at the lower part of the cylinder. This is a vertical continuous powder coating booth characterized by having a paint recovery device communication port and a paint discharge port at the top of the cylinder.

Next, the present invention will be explained with reference to the drawings.

1 is a vertical cylinder whose frame cross section is circular;
It is an oval, triangle, quadrilateral, or other polygon.

Reference numeral 2 denotes an inlet portion of the object to be coated, which is provided at the lower measuring portion of the cylindrical body 1.

Reference numeral 3 denotes an outlet section for the object to be coated, which is provided at the upper measuring section of the cylindrical body 1.

Reference numeral 4 denotes a paint recovery device communication port, which is provided at the bottom of the cylindrical body 1.

Reference numeral 5 denotes a paint discharge port, and one or two paint discharge ports are provided at the top of the cylinder body 1.
More than one is provided.

The object to be coated 6 is suspended from the conveyor T, enters the object to be coated through the inlet section 2, and exits through the outlet section 3 of the object to be coated.

At this time, the object to be coated 6 is coated with the powder paint discharged from the paint discharge port 5.

In this case, in the discharged powder coating, particles with a large particle size fall below the cylinder 1 relatively faster than particles with a small particle size, so the object to be coated 6 first falls below the cylinder 1. At this point, particles with a large particle size are mainly coated, and then when the object 6 to be coated advances upward, particles with a small particle size are mainly coated.

Therefore, even if the object 6 to be coated has a complicated shape, the coating film will be uniform, the finished state will be good, and the coating efficiency will be excellent.

When the object 6 to be coated is hung on the conveyor 7, a primary hanger 8 is fixed at right angles to the conveyor 7, and a secondary hanger 8 is attached to which the object 6 is suspended from the primary hanger 8 by means of a hook. 9 are connected.

In this connection, the tips of the primary hanger 8 and the secondary hanger 9 are formed into a ring shape and fit together, or the tip of the secondary hanger 9 is connected to a hook. Since this is suspended from the ring at the end of the primary roller 8, the object 6 to be coated is always in the direction of gravity, regardless of the location on the conveyor 7. .

When collecting powder paint, most of the discharged powder paint falls below the cylinder 1 due to its own weight, so it is scattered and floating above the cylinder 1. By suctioning the atmosphere inside the cylinder 1 through the paint recovery device communication port 4, its purpose can be easily determined.

Since the cylindrical body 1 is vertical, only a small amount of powder paint adheres to its inner wall after being discharged, making it extremely easy to clean the inside of the painting booth and change the color of the powder paint used. can.

Further, the connecting portion between the primary ringer 8 and the secondary ringer 9 can be easily cleaned with an air blower after painting is completed.

As described above, the coating booth of the present invention is capable of continuously and automatically coating objects with complex shapes, which had conventionally been done manually, and has extremely high coating efficiency.
The coating film is uniform and has a good finish, and
This provides many advantages in powder coating, as the interior of the coating booth can be cleaned extremely easily.

Next, the effects of the present invention will be explained using comparative examples.

Epoxy powder paint (Nippon Oil Co., Ltd., Konatsuku Kuzu 2000)
Under the following coating conditions, the coating booth of the present invention (hereinafter referred to as 1 inventive product) and the conventionally used powder coating booth (hereinafter referred to as ``conventional product'') were coated using the preheating method and electrostatic powder spraying method. The results were obtained as shown in Table 1 for the preheat method and Table 2 for the electrostatic powder spraying method.

Coating conditions Conveyor speed: 2.0m 1 minute Discharge rate: 1ooy, "min, 300♂/min Hanger pitch: 250mm Distance between discharge gun and object to be coated: 200mm (discharge gun is 1 gun per side) Wind speed in booth: 0. 2 to 0.3 m/sec (product of the present invention) 0.4 to 0
．． 5m/sec (conventional product) (1) Preheating temperature (preheating method): 150℃ Charging voltage (electrostatic powder spraying method) Knee 60KV Note (1) For the conventional product, the wind pressure inside the booth is not higher than 0.4yx/sec. This is because there is a speech bubble outside the tooth.

[Brief explanation of the drawing]

The figure is a schematic sectional view of a vertical continuous powder coating booth showing one embodiment of the present invention. In the figure, 1... cylinder body, 2... object to be coated, inlet section, 3... outlet section of object to be coated, 4... paint recovery device Connection port, 5...Paint discharge port, 6...
...Object to be coated, 7...Conveyor, 8...
...Primary...Ngaa 9...Secondary...Ngaa.

Claims (1)

[Claims] 1 A vertical cylindrical body, with an inlet for the object to be coated at the lower part of the cylindrical body, an outlet for the object to be coated at the upper part of the cylindrical body, and a connection to the paint recovery device at the bottom of the cylindrical body. A vertical continuous powder coating booth characterized by having a paint discharge port in the mouth and the upper part of the cylinder.