JPH11300249A - Air blow device for powder coating booth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove powder coating stuck on the inner wall face of a coating booth under a low air pressure by forming an air nozzle with a plurality of tubes with a specified inner diameter in an air blow device for removing and cleaning the powder coating stuck on the inner wall face of the powder coating booth with air. SOLUTION: A blow head 1 connected with an air feeding source such as a compressor through a pressure regulator is formed of a hollow pipe and is vertically arranged in parallel with the side wall on the inner face side of the side wall in a coating booth 3 and is freely movably left and right along the side wall. In addition, a plurality of air nozzles 2 formed of tubes are arranged in parallel at a specified pitch up and down on the blow head 1. In this case, the inner diameter of the tube forming the air nozzles 2 is set at most 2.0 mm. It is possible thereby to effectively remove a powder coating stuck on the inner wall face of the coating booth without scattering the powder coating even under a low air pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air blower for removing and cleaning powder paint adhered to a booth inner wall surface of a powder coating booth by air.

[0002]

2. Description of the Related Art Powder coating is generally performed in a coating booth, and overspray powder that has not adhered to an object to be coated is collected by a collecting device and reused.

[0003] As described above, even when the overspray powder is collected by the collecting device, a part of the overspray powder adheres to the inner wall surface of the coating booth.

For this reason, conventionally, when performing color change, the powder paint adhering to the inner wall surface of the coating booth is removed and cleaned by using a manual or automatic air blow device.

[0005] The air blow device is provided with an air nozzle in a blow head connected to an air supply source. However, in the case of manual operation, a difference occurs in the degree of cleaning by the on-site operator, and the on-site operator performs painting. There is also a problem with the working environment because the air blower enters the booth, and an automatic air blow device that automatically moves the blow head along the inner wall surface of the painting booth has been used.

[0006]

Conventionally, an air nozzle formed in a blow head of an air blow device is formed in a slit shape so that air jetted from the air nozzle spreads in a fan shape.

As described above, when the air nozzle is formed in a slit shape and the air is spread in a fan shape, the air in the central portion spreading in a fan shape is weakened, so that the powder paint adhered to the inner wall surface of the coating booth. If you try to remove
With high air pressure, the air volume must be increased.

When an air nozzle formed in the above-mentioned slit shape is used to remove the powder paint firmly attached to the inner wall surface of the painting booth by being charged with static electricity by an electrostatic painting gun, the air pressure becomes at least 2 to 2. 3 kg / m ²
is necessary.

In particular, in the case of an automatic air blow device, as in the case of a manual operation, an on-site operator aims at powder coating that adheres to the inner wall surface of a coating booth and is difficult to peel off.
Since it is not possible to focus on blowing air, if air blowing is to be completed, the air blowing should be set to a high air pressure, for example, 5-6 kg / m ² .
The air volume must be increased.

[0010] However, the air blow is 5-6 kg / m.
^In order to perform the process with a high air pressure of ^{2 and} a large amount of air flow, a large compressor dedicated to air blow is required, and there is a problem that equipment costs are high.

When air blowing is performed at a high air pressure with a large air flow, turbulence is generated in the coating booth by the air blowing, and the powder paint separated by the air blowing scatters in the coating booth. However, there is a problem that the scattered powder paint leaks out of the painting booth to deteriorate the working environment, or the scattered powder paint adheres to the inner wall surface of the painting booth again, causing color mixing.

Accordingly, an object of the present invention is to provide an air blow device capable of removing powder paint adhering to the inner wall surface of a coating booth at a low air pressure and with a small air flow.

[0013]

In order to solve the above-mentioned problems, according to the present invention, an air nozzle provided in a blow head is formed by a plurality of tubes having an inner diameter of 2.0 mmφ or less.

From a tube having an inner diameter of 2.0 mmφ or less, air is thinly ejected like a needle and hits the inner wall surface of the coating booth in a dotted manner. As a result, FIG.
As shown in FIG. 7A, a small hole is formed in the powder coating layer adhering to the inner wall surface of the coating booth. The small hole is linked to the hole, and as shown in FIG. Body paint peels over a wide area.

In order to make a small hole in the powder coating layer on the inner wall of the coating booth, it is necessary to use
Since air only needs to be jetted at a low pressure of 1.0 kg / m ² , no turbulence is generated in the coating booth, and the peeled powder coating does not scatter in the coating booth.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In an air blow device according to the present invention, an air nozzle 2 of a blow head 1 connected to an air supply source such as a compressor is formed by a plurality of tubes having an inner diameter of 2.0 mm or less.

The blow head 1 is formed by a hollow pipe, and is installed on the inner side of the side wall of the coating booth 3 so as to be perpendicular to the side wall.

The blow head 1 is automatically moved right and left along a side wall of the painting booth 3 by a moving device.

The lower end of the blow head 1 is closed, and the upper end is connected via a pressure regulator 4 to an air supply source such as a compressor.

The blow head 1 is provided with a plurality of air nozzles 2 formed of tubes at predetermined pitches vertically.

The inner diameter of the tube forming the air nozzle 2 is 2.0 mmφ or less. When the thickness is 2.0 mm or more, the air jetted from the tube does not become thin like a needle, and the powder paint adhered to the inner wall surface of the coating booth 3 cannot be peeled off unless the air pressure is increased.

When the inner diameter of the tube forming the air nozzle 2 is 2.0 mm or less, the powder paint adhering to the inner wall surface of the coating booth can be effectively removed at a low air pressure without scattering the powder paint. It was confirmed by the following experiment that it could be removed.

In the coating booth 3 where the experiment was conducted, as shown in FIG. 3, the overspray powder was sucked from the bottom surface and the overspray powder was collected by a collecting machine. 0.5 to 0.7 m / sec from the entrance 6 before and after the object suspended from the entrance / exit 5
The booth inflow speed of c is generated. In FIG. 3, reference numeral 7 denotes a suction duct.

A vertical cylindrical blow head 1 having a length of 1000 mm is installed in the coating booth 3 so as to move at a moving speed of 1.0 m / min in the left-right direction along the inner surface of the side wall. I have.

The blow head 1 is provided with an air nozzle 2 provided at a predetermined pitch so that the tip is located at a distance of 50 mm from the inner wall surface of the coating booth 3. The type, number of pitches, and number of air nozzles 2 are as shown in Table 1. The air nozzle 2 has an inner diameter of 0.5 m
mφ, 1.0mmφ, 2.0mmφ, 3.0mmφ,
One formed with a tube of 4.0 mmφ and 6.0 mmφ, and the other formed with a slit shape having a width of 0.33 mm and a vertical length of 15 mm were used. Then, from these air nozzles 2, the air pressure is set to 0.5 to
The cleaning state of the wall of the coating booth 3 and the scattering state of the powder paint were examined while changing the pressure to 5.0 kg / cm ² . The results are as shown in Table 1. When a tube having an inner diameter of 2.0 mmφ or less is used as the air nozzle 2, the coating booth 3 is sprayed at a low air pressure without scattering the powder coating.
It was confirmed that the inner wall surface could be cleaned.

[0026]

[Table 1]

The tubes used in the experiments in Table 1 were:
All were made of Teflon and had a length of 20 mm. The original input air pressure supplied to the pressure regulator 4 was set at 5 kg / cm ² .

The tube forming the air nozzle 2 used in the present invention has a length of 10 to 50 mm. 10m
If the length is less than m, straightness of the ejected air cannot be obtained, and if the length is more than 50 mm, the resistance increases, which is not preferable.

Next, in order to more effectively prevent the powder paint from scattering when cleaning the inner wall surface of the coating booth 3, as shown in FIG. 4, a scattering prevention cover 8 connected to a suction device is used.
May surround the blow head 1. As shown in FIG. 5, only the tube forming the air nozzle 2 may be inserted into the scattering prevention cover 8.

Further, as shown in FIG.
May be installed obliquely with respect to the inner wall surface of the coating booth 3.

[0031]

As described above, according to the present invention, the air nozzle of the air blow device of the coating booth is provided with an inner diameter of 2.0 m.
By forming with a plurality of tubes of mφ or less, at low air pressure, without scattering powder coating,
The powder paint adhering to the inner wall surface of the painting booth can be removed.

[Brief description of the drawings]

FIG. 1 is a side view of an air blow device according to the present invention.

FIG. 2 is a partially enlarged cross-sectional view of a blow head and an air nozzle in the air blow device according to the first embodiment;

FIG. 3 is a schematic cross-sectional plan view of a painting booth provided with an air blow device according to the present invention.

FIG. 4 is a plan view showing a state in which a blow head is surrounded by a scattering prevention cover.

FIG. 5 is a plan view showing another example of the scattering prevention cover.

FIG. 6 is a plan view showing a state where an air nozzle is installed obliquely.

FIG. 7 (a) is a conceptual diagram showing a state where powder paint is attached to the inner wall surface of a coating booth, and FIG. 7 (b) is a conceptual diagram showing a state where powder paint is removed by air jetted from a tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Blow head 2 Air nozzle 3 Painting booth 4 Pressure regulator 5 Conveyor 6 Doorway 7 Suction duct 8 Shatterproof cover

Claims (4)

[Claims] 1. A powder coating booth having an air nozzle provided with an air nozzle in a blow head connected to an air supply source.
An air blowing device for a powder coating booth, wherein the air blowing device is formed by a plurality of tubes of mφ or less. 2. The air blowing device of a powder coating booth according to claim 1, wherein the plurality of tubes are arranged at a pitch of 20 mm or less. 3. The air blow device of a powder coating booth according to claim 1, wherein the tube projects from the outer surface of the blow head with a length of 10 to 50 mm. 4. The blow head according to claim 1, wherein the back surface of the blow head is surrounded by a cover for preventing powder paint from scattering, and a suction device is connected to the cover. Air blower for powder coating booth.