JPH07112149A - Powder coating booth - Google Patents

Abstract

PURPOSE:To rapidly and efficiently perform a cleaning operating at the time of color changing in powder coating by forming this powder coating booth to a booth shape constituted to improve the flow of the air in the booth, thereby efficiently feeding the powder failing to be adhered to a material to be coated toward a suction port so that a powder,X paint is not adhered on the wall surfaces in the booth as far as possible. CONSTITUTION:This powder coating booth 5 has the suction port 4 for housing the powdery paint 3 injected from a powder coating machine 1 toward the material 2 to be coated. The inner periphery of the powder coating booth 5 is formed by a curved surface such as hemispherical surface.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder coating booth which improves the fluidity of powder scattered in a booth (coating chamber) during powder coating.

[0002]

2. Description of the Related Art In recent years, a coating method using electrostatic powder coating has become popular.

As shown in FIG. 3, the apparatus used for electrostatic powder coating has a suction port 2 at the center of a box-shaped booth 21, for example.
2 is provided, a filter 23 is attached to the suction port 22,
A powder coating machine 25 is provided on the entire surface of the booth 21 by opening a passage for passing the object to be coated 24, and the powder coating machine 25 can be vertically moved by arranging a plurality of ejection ports 25a and 25b in a horizontal direction. A rail 26 is attached to the passage of the article to be coated 24, a suspension wire 27 is hung at a predetermined interval from the rail 26, and the article to be coated 24 is hooked on each. Then, the powder coating material 28 electrically charged by the electrostatic induction action is ejected from the vertically moving ejection openings 25a, 25b ... Toward the inside of the booth 21, and the coating object 2 that is guided by the rail 26 and passes therethrough.
Adsorb on the surface of No. 4.

The powder coating material 28 which is not adsorbed on the object to be coated 24 is scattered inside the booth 21 and part of the powder coating material 28 is sucked by the filter 22 by the air flow flowing toward the suction port 22.

[0005]

However, the conventional booth 21 used for powder coating has a rectangular box shape as shown in the drawing, and has corners on all four sides, and an air pool 30 in which air does not flow there. Occurs, and the powder coating material 28 is deposited on the wall surface of the corner. Further, in such a box-shaped booth 21, since the air flowability is poor, the suction efficiency into the suction port 22 is poor, and the powder coating 2
8 convection in the booth 21 and many powder paints 28 on the wall surface.
Is attached.

On the other hand, it is necessary to change the color in powder coating work, and if powder paints of different colors remain in the booth, different colors will be applied when the next color is used. It causes the inconvenience of adhering to. Therefore, it is necessary to completely clean the powder coating adhered to the wall surface in the booth when changing colors.

Normally, powder paint adhered to the wall surface, ceiling, floor surface, etc. in the booth is wiped off by an appropriate cleaning means, but powder adhered to the corner of the conventional box booth is In addition to being layered, the cleaning work is difficult and cannot be easily wiped off, and the cleaning work when changing colors requires a lot of trouble and time, making the entire powder coating work inefficient. I made it a thing.

The present invention has been made in view of the above circumstances, and efficiently forms powder that has not adhered to an object to be coated by forming a booth shape with an improved air flow in the booth. The powder coating booth can be efficiently cleaned in a short time by sending powder toward the suction port to prevent powder from adhering to the wall surface inside the booth as much as possible. The purpose is to do.

[0009]

In order to achieve the above object, a powder coating booth of the present invention is provided with a suction device for collecting powder coating material sprayed from a powder coating machine toward an object to be coated. In a powder coating booth having a mouth, the inner periphery of the powder coating booth is formed by a curved surface.

Further, the powder coating booth may have a hemispherical inner peripheral shape.

Further, at the suction port of the powder coating booth,
A rectifying protector facing the upstream side of the airflow may be provided.

[0012]

As described above, since the inner circumference of the powder coating booth 5 is formed into a curved surface, the air flow in the booth 5 flows toward the suction port without convection. Therefore, powder coating machine 1
Of the powder coating material 3 sprayed from the one that has not adhered to the object to be coated 2, the amount adhered to the wall surface in the booth 5 can be drastically reduced by being blown by the air flow toward the suction port 4.

Further, such an inner peripheral shape of the booth 5 facilitates the cleaning operation itself, so that the cleaning operation when changing colors can be performed easily and in a short time.

Further, at the suction port 4 of the powder coating booth 5,
By providing the rectifying protector 6 facing the upstream side of the air flow, the air flow strongly generated near the suction port 4 can be relaxed and the air in the booth can be rectified uniformly.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional view of the powder coating booth of the present invention. FIG. 2 is a front view of the powder coating booth of the present invention.

The inner peripheral shape of the powder coating booth 5 is a hemisphere, and the suction port 4 is opened in the center thereof. However, the inner peripheral shape of the powder coating booth 5 is not limited to a semi-spherical shape, and may be formed of another combination of curved surfaces that improves the flow performance of the air flowing toward the suction port 4 in the booth 5.

A discharge pipe 7 is connected to the suction port 4, and the discharge pipe 7
A filter 8 is attached near the suction port 4. The filter 8 has a shape in which the inside is folded into a plurality to enlarge the filter surface, and the outer circumference forms a cylindrical frame body, which can be easily attached and detached by being inserted into the suction port 4. Is.

A suction fan 9 is provided on the discharge side of the discharge pipe 7, and when the fan 9 is rotated by driving a motor,
The air in the booth 5 flows toward the suction port 4 and flows into the exhaust pipe 7 via the filter 8.

Further, a protector 6 is fixedly provided on the open side of the suction port 4. The protector 6 is in the shape of a hemisphere or a cap, and faces the upstream side of the air flow generated in the booth 5 toward the suction port 4. This protector 6
Thus, the air flow in the booth 5 can be rectified, and the air flow that becomes particularly strong in the vicinity of the suction port 4 can be alleviated, so that the air fluidity in the booth 5 can be made uniform.

A powder coating machine 1 is installed upright on the open side of the powder coating booth 5. This powder coating machine 1 has a horizontal ejection port 1
a and 1b are provided, and these ejection ports 1a and 1b are driven so as to move up and down integrally. The jet ports 1a and 1b are connected to a common feed pipe, and the powder coating material housed in a container (not shown) is sent to the feed pipe by compressed air and the jet ports 1a and 1b are connected.
Inject from a and 1b.

Between the open side of the powder coating booth 5 and the powder coating machine 1, a plurality of suspension lines 12 guided by the rails 11 and moving forward are provided at predetermined intervals.
The article 2 to be coated is hung at the lower end of the powder coating 2 so as to pass in front of the powder coating machine 1.

With the above construction, when the powder coating machine 1 is operated, the powder coating material 3 is sprayed from the spray ports 1a and 1b while repeatedly moving up and down, and is sprayed onto the coating object 2 passing in front.

In electrostatic powder coating, the powder coating machine 1 is charged with a negative charge, and the object 2 to be coated is the rail 1
1 and the suspension wire 12 are charged with a positive electric charge, and the powder coating material 3 is attached to the object to be coated 2 by the electric attraction of these.

Powder coating material 3 not adhered to the object to be coated 2
Is sucked in the booth 5, enters the suction port 4, passes through the filter 8, and adheres to the filter 8. The powder coating material 3 attached to the filter 8 can be reused.

[0026]

As described above, according to the powder coating booth of the present invention, since the booth inner peripheral shape is formed of a curved surface such as a hemisphere, air flow performance in the booth is improved. As a result, there is no air retention in the corners that occurs in the conventional box booth, and the powder coating material in the booth can be efficiently flowed toward the suction port.

As a result, the powder paint adhered to the wall surface in the booth is drastically reduced, and most of the powder paint flows into the suction port and can be collected by the filter.

Such a curved booth reduces the amount of powder coating material adhering to the wall surface as described above and streamlines the cleaning of the wall surface itself. Therefore, cleaning at the time of color changing work is simple and short. It can be done in time and can greatly improve the overall painting work.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a powder coating booth of the present invention.

FIG. 2 is a front view of the powder coating booth of the present invention.

FIG. 3 is a vertical sectional view of a conventional box-shaped powder coating booth.

[Explanation of sign]

DESCRIPTION OF SYMBOLS 1 ... Powder coating machine, 2 ... Coating object, 3 ... Powder coating, 4 ... Suction port, 5 ... Powder coating booth, 6 ... Protector, 7 ... Exhaust pipe, 8 ... Filter, 9 ... Fan, 11 ... Rail, 1
2 ... Suspension line.

Claims (3)

[Claims] 1. A powder coating booth 5 equipped with a suction port 4 for collecting powder coating material 3 sprayed from a powder coating machine 1 toward an object 2 to be coated. A powder coating booth whose inner circumference is formed by a curved surface. 2. The powder coating booth according to claim 1, wherein said powder coating booth 5 has a hemispherical inner peripheral shape. 3. The powder coating booth according to claim 1, wherein the suction port 4 of the powder coating booth 5 is provided with a rectifying protector 6 facing in the upstream direction of the air flow.