JP2000262931A - Powder coating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the entrance of workers into a powder coating booth and the cleaning necessary for color change by forming the wall surface of the powder coating booth from a non-conductive material and the bottom surface of the powder coating booth flat. SOLUTION: A powder coating device is constituted of the powder coating booth 1 having flat bottom surface, cyclones 3, 3', joint pipes 2, 2' for connecting the wall surface of the powder coating booth 1 to the cyclone 3, 3' and bag filters 5, 5' and scrapers 8, 8' are provided on the bottom surface of the powder coating booth. The wall surface of the powder coating booth 1 is formed form the non-conductive material. As the material of the wall surface of the powder coating booth, the non-conductive material is preferable and polyvinyl chloride is mentioned. As the forming method of the wall surface of the powder coating booth from the non-conductive material, such a method by forming the whole powder coating from a metallic material and lining the non-conductive material on the wall surface is mentioned.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder coating apparatus, and more particularly, to a powder coating apparatus which allows an operator to easily enter a powder coating booth and clean the color for cleaning.

[0002]

2. Description of the Related Art Powder coatings have attracted attention as environmentally friendly coatings because there are no organic solvents released into the atmosphere. In the application of the powder coating, a part of the powder coating not applied to the object to be coated in the powder coating booth adheres to the wall surface of the powder coating booth and becomes dirty. In particular,
In the case of powder coating using the electrostatic powder coating method, if the wall surface is grounded, the powder paint that has not been applied to the object to be coated is firmly applied to the wall surface by electrostatic attraction, and color When cleaning the powder coating booth for replacement, it is extremely difficult to remove the powder coating applied to the wall.

To solve this problem, Japanese Patent No. 258
No. 8687 discloses an electrostatic powder coating apparatus using a smooth insulating plastic material on the inner wall of a powder coating booth. This publication discloses a method in which an operator rides on an electric gondola to clean the inside of a powder coating booth when cleaning for color change or the like, but the cleaning workability is insufficient.

[0004]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a powder coating booth, a cyclone and / or a bag filter, and a connecting pipe for connecting the powder coating booth to a cyclone and / or a bag filter. It is an object of the present invention to provide a powder coating apparatus comprising: a powder coating apparatus that facilitates cleaning required for an operator to enter the powder coating booth and change colors.

[0005]

The present invention comprises a powder coating booth, a cyclone and / or a bag filter, and a connecting pipe for connecting the powder coating booth to the cyclone and / or a bag filter. It is an object of the present invention to provide a powder coating apparatus, wherein a wall surface of the powder coating booth is formed of a non-conductive material, and a bottom surface of the powder coating booth is flat. .

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A powder coating apparatus according to the present invention comprises a powder coating booth, a cyclone and / or a bag filter, and a connecting pipe for connecting the powder coating booth to the cyclone and / or a bag filter. Wherein the wall surface of the powder coating booth is formed of a non-conductive material, and the bottom surface of the powder coating booth is a flat surface.

A powder coating booth in the powder coating apparatus of the present invention is a room for coating an object to be coated by a powder coating machine, and a collection section is connected to a bottom surface of the powder coating booth. The wall surface of the powder coating booth is formed of a non-conductive material, and the bottom surface of the powder coating booth is a flat surface.

[0008] The material of the wall surface of the powder coating booth in the powder coating apparatus of the present invention is formed of a non-conductive material. Specific examples of the non-conductive material include polyvinyl chloride. As a method of forming the wall of the powder coating booth using this non-conductive material, a method in which the entire powder coating booth is formed of a conventional metal material and then a non-conductive material is attached to the wall, Examples of the method include a method in which the other portion is formed of a metal material and other portions are formed of a metal material, and a method in which the entire powder coating booth is formed of a non-conductive material.

The powder coating booth in the powder coating apparatus of the present invention has a flat bottom surface. Since the bottom surface of the powder coating booth of the present invention is flat, an operator can directly enter the powder coating booth and work. In particular, at the time of cleaning such as color change, the work can be easily performed. As the material of the bottom surface of the powder coating booth, specifically, those described above for the powder coating booth can be used. It is necessary to have a strength that does not cause bending or the like.

[0010] A scraper may be provided on the bottom surface of the powder coating booth in the powder coating apparatus of the present invention.
The scraper is a device capable of scraping uncoated powder paint deposited on the bottom surface of the powder booth, which is a flat surface, and is provided with the scraper so that the scraper can be efficiently sent to a connection pipe.

[0011] The powder coating booth in the powder coating apparatus of the present invention can be provided with a conveyor, rails and the like for transporting the object to be coated.

The cyclone in the powder coating apparatus of the present invention is usually connected to a bag filter and further connected to a collecting fan. By the suction force generated by the rotation of the fan, the uncoated powder coating in the powder coating booth can be efficiently recovered through the connection pipe and further into the cyclone.

The cyclone is used for collecting the uncoated powder coating. Specific examples of the cyclone used in the present invention include a vertical cyclone and a horizontal cyclone. When a vertical cyclone is used, the type of the cyclone is not particularly limited, but is preferably a multicyclone from the viewpoint of the size of the cyclone.

The uncoated powder paint not recovered by the cyclone is further recovered by a connected bag filter.

The bag filter in the powder coating apparatus according to the present invention is an apparatus to which the collecting fan is connected to collect the uncoated powder coating which has not been collected by the cyclone. Further, the bag filter according to the present invention includes:
It may be directly connected to the connection pipe without passing through the cyclone. The powder coating material collected by the bag filter may be discarded without being reused.

The connecting pipe in the powder coating apparatus according to the present invention comprises:
The powder coating booth is connected to the cyclone and / or the bag filter. The material of the connection pipe is not particularly limited, and examples thereof include a metal material and a non-conductive material.

The connecting pipe in the powder coating apparatus according to the present invention comprises:
In the powder coating performed in the powder coating booth, an uncoated powder coating is applied to the workpieces gathered on the bottom surface of the powder coating booth to the cyclone and / or the bag filter. Things.

[0018] At least one connection pipe is connected to the powder coating booth. Further, in order to increase the collection efficiency of the cyclone and / or the bag filter, a plurality of connection pipes and the cyclone and / or the bag filter may be provided.

There are two methods for connecting the connection pipe and the powder coating booth. One method is a connection method in which the connection pipe is connected to at least one of the wall surfaces of the powder coating booth. The position for connecting the connection pipe can be easily designed by those skilled in the art. From the viewpoint of the collection efficiency and the ease of cleaning in the cyclone and / or bag filter, specifically, the position of the wall surface The position is preferably lower than the height of the object to be coated, and more preferably the position in contact with the bottom surface of the powder coating booth. When the connection pipe is connected at a position in contact with the bottom surface of the powder coating booth, the connection pipe may intersect and contact the bottom surface. The connection pipe is preferably a straight pipe from the viewpoint of easy cleaning and efficient feeding of the uncoated powder paint from the powder coating booth to the cyclone and / or bag filter.

Another method is a connection method in which the connection pipe is connected to the bottom of the powder coating booth.
By using this method, the uncoated powder paint that has been collected and collected by the scraper or the like can be dropped into the connecting pipe regardless of the airflow, and the cyclone and / or
Or you can send it to a bag filter. In this case, it is preferable to make the connecting pipe as small as possible from the viewpoint of easy cleaning and efficient feeding of the uncoated powder coating material from the powder coating booth to the cyclone and / or bag filter.

Further, a flow straightening plate may be provided in the powder coating booth at a place where the connection pipe does not disturb the coating so as not to disturb the air flow in the powder coating booth.
The size and shape of the current plate can be appropriately set by those skilled in the art.

When a plurality of connection pipes and cyclones are installed, a switching damper can be provided in each connection pipe at a connection portion with the powder coating booth. Normally, when powder coating is performed by using the powder coating apparatus as described above, the switching damper in the connection pipe connected to the cyclone on the side to which the uncoated powder coating is to be sent is opened, and the remaining damping is performed. By closing and using the switching damper in the connection pipe, the uncoated powder paint can be sent to only the cyclone on the side to be sent through the connection pipe having the opened switching damper. Therefore, when applying a powder paint of a color different from the previous color, the previously opened switching damper is closed, and the previously closed switching damper is opened to perform powder coating to collect the previous color. The uncoated powder coating, which is different from the recovered cyclone, can be sent only to the other cyclone, so that the collected uncoated powder coating does not mix with a different color.

Further, among the cyclones connected to the plurality of connection pipes provided with the switching damper, a part may be replaced with a bag filter and connected directly to the connection pipe. When performing powder coating using such a powder coating apparatus, usually, the switching damper in the connection pipe to which the cyclone is connected is opened, and the switching damper in the connection pipe to which the bag filter is connected is closed. By using a connection pipe with a switching damper that opened the uncoated powder paint,
Can be sent only to cyclones. However, in the case where the uncoated powder paint is not reused, that is, when the so-called blow-off is performed, the bag filter is connected because it is not necessary to collect the uncoated powder paint in the cyclone. By opening the switching damper in the connection pipe and closing and using the switching damper in the connection pipe to which the cyclone is connected, only the above bag filter can be passed through the connection pipe with the switching damper with the uncoated powder paint opened. Can be sent.

The length of the connecting pipe in the present invention is not particularly limited, but from the viewpoint of a planar space and the recovery efficiency of a cyclone and / or a bag filter, the powder coating booth, It is preferable to set the length of the connection pipe so that the distance between the cyclone and / or the bag filter is 5 m or less. If the distance between the powder coating booth and the cyclone and / or the bag filter is longer than 5 m, efficient collection cannot be performed. Therefore, uncoated powder in the connection pipe or the bottom surface of the powder coating booth. When the body paint remains and a powder paint of a color different from the previous color is applied, the powder paint of the previous color is mixed with the uncoated powder paint collected by the cyclone and / or the bag filter, There is a risk of so-called color mixing. In addition, extra planar space is required for installation.

Further, in the powder coating apparatus of the present invention, the height of the connecting part between the connecting pipe and the cyclone and / or the bag filter and the height of the connecting part between the connecting pipe and the wall or bottom surface of the powder coating booth. As a relationship, from the viewpoint of the collection efficiency in the cyclone and / or bag filter,
Both are the same height, or the height of the connection between the connection pipe and the wall or bottom of the powder coating booth is higher, and the connection between the connection pipe and the cyclone and / or bag filter is higher. It is preferable that the height is a lower position. The connection pipe may be diagonally connected as long as the above conditions are satisfied. In addition, from the viewpoint of the position of the cyclone and / or the bag filter and the powder coating booth, a pit is provided in the basement, and the cyclone and / or the bag filter is provided there, or a pit is provided in the basement. It is preferable to provide a gantry on which a powder coating booth is installed.

[0026]

1 shows a powder coating booth 1 having a flat bottom surface, cyclones 3 and 3 '(not shown), and a connecting pipe 2 for connecting the wall of the powder coating booth 1 to the cyclone 3. FIG. 2 is a cross-sectional view of a connected powder coating apparatus 2 ′ (not shown) and connected bag filters 5 and 5 ′ (not shown). The bottom surface of the powder coating booth 1 is provided with scrapers 8 and 8 '(not shown). A collection fan (not shown) is connected to the bag filters 5 and 5 '.

FIG. 2 shows the relationship between the powder coating booth 1 and the connecting pipe 2 of FIG. 1 and the powder coating booth 1 and the connecting pipe 2 '.
It is a side view showing the relationship with (illustration omitted). Further, FIG.
Are the relationship between the scraper 8 and the connecting pipe 2 provided on the bottom surface of the powder coating booth 1, the relationship between the scraper 8 '(not shown) and the connecting pipe 2' (not shown), and the scrapers 8 and 8 '(see FIG. It is a figure showing movement of (omission).

FIG. 4 shows a powder coating booth 1 having a flat bottom surface, cyclones 3 and 3 ′ (not shown), and a connecting pipe 2 for connecting the bottom surface of the powder coating booth 1 to the cyclone 3. FIG. 2 is a cross-sectional view of a connected powder coating apparatus including a bag filter 5 and a bag filter 5 ′ (not shown). The bottom surface of the powder coating booth 1 is provided with scrapers 8 and 8 '(not shown). A collection fan (not shown) is connected to the bag filters 5 and 5 '. FIG. 5 is a side view showing the relationship between the powder coating booth 1 and the connecting pipe 2 and the relationship between the powder coating booth 1 and the connecting pipe 2 '(not shown) in FIG.

The cyclone 3, the connecting pipe 2, the bag filter 5 and the members provided therein, and the cyclone 3 ', the connecting pipe 2', the bag filter 5 ', The members provided therein have exactly the same configuration. The following is a description of the illustrated side.

The powder coating in the powder coating apparatus of the present invention is performed by the powder coating booth
The object 9 to be coated carried into the inside is performed in the powder coating booth 1 using a powder coating gun or the like (not shown). The uncoated powder coating that has not been applied to the object 9 falls to the bottom of the powder coating booth 1 and accumulates. The uncoated powder paint deposited on the bottom surface is sent from the connection pipe 2 to the cyclone 3 and the bag filter 5 by a collection fan (not shown) connected to the bag filter 5. At this time, the unpainted powder paint deposited on the bottom surface can be efficiently sent from the connection pipe 2 to the cyclone 3 by scraping with the scraper 8. Thus, the uncoated powder coating material is collected in the cyclone 3 and accumulated in the collection tank 6 connected to the lower part of the cyclone 3.

The remaining uncoated powder coating material not collected in the cyclone 3 is further sent to a bag filter 5 connected to the cyclone 3 and the duct 4. In the bag filter 5, the remaining uncoated powder paint is collected and accumulated in a dust powder tank 7 connected to a lower portion of the bag filter 5.

The inside of the powder coating booth 1 is cleaned by an operator entering the powder coating booth 1. The operator cleans the powder paint adhered to the wall surface of the powder coating booth 1 with an air gun or the like.

[0033]

According to the powder coating apparatus of the present invention, since the wall surface of the powder coating booth is formed of a non-conductive material, it is easy to clean the wall surface of the powder coating booth. This is because, when a wall is formed of a non-conductive material, it is difficult for the electric charge to move within the wall, and therefore, even when the charged powder coating comes into contact with the wall, the electric charge of the powder coating does not move to the wall, This is considered to be because it is possible to suppress or prevent the powder paint from being applied to the wall surface by the electrostatic suction force.

In the powder coating apparatus of the present invention, since the bottom surface of the powder coating booth is flat, it is easy for an operator to enter the powder coating booth, and Can be easily cleaned.

Further, a scraper or the like may be provided on the bottom surface of the above-mentioned powder coating booth for scraping and collecting the uncoated powder coating. By installing the scraper or the like, the uncoated powder coating deposited on the bottom surface of the powder coating booth can be efficiently subjected to cyclone and / or
Alternatively, it can be sent to a bag filter, and the color mixture at the time of color change becomes extremely small. In addition, since it is not necessary to lay a duct for connecting a powder coating booth and a cyclone and / or a bag filter, which has been conventionally used, a planar space can be reduced. Further, since the height of the powder coating booth is low, the conveying rail for the object to be coated does not need to be formed into a mountain shape or the like as in the prior art, and can be made straight.

[0036]

[Brief description of the drawings]

[0037]

FIG. 1 is a sectional view of a powder coating apparatus in which a wall of a powder coating booth having a flat bottom surface and a cyclone are connected by a connection pipe.

[0038]

FIG. 2 is a side view showing a relationship between the powder coating booth of FIG. 1 and a connection pipe.

[0039]

FIG. 3 is a cross-sectional view showing the movement of a scraper provided on the bottom surface of the powder coating booth and the relationship between the scraper and a connection pipe.

[0040]

FIG. 4 is a sectional view of a powder coating apparatus in which a wall of a powder coating booth having a flat bottom surface and a cyclone are connected by a connecting pipe.

[0041]

FIG. 5 is a side view showing a relationship between the powder coating booth of FIG. 2 and a connection pipe.

[0042]

[Brief description of reference numerals]

 DESCRIPTION OF SYMBOLS 1 Powder coating booth 2 Connection pipe 2 'Connection pipe 3 Cyclone 3' Cyclone 4 Duct 4 'Duct 5 Bag filter 5' Bag filter 6 Collected powder tank 6 'Collected powder tank 7 Dust powder tank 7' Dust powder tank 8 Scraper 8 '' Scraper 9 Workpiece 10 Collection fan 11 Pit 12 Workpiece transport rail

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takao Amagasaki 19-17 Ikedanakamachi, Neyagawa-shi, Osaka Japan Paint Co., Ltd. (72) Inventor Fumihiro Murakami 2-27-5 Toyamanaka, Nerima-ku, Tokyo Murakami Industries F Term Co., Ltd. (Reference) 4F034 AA01 DA17

Claims (6)

[Claims] 1. A powder coating apparatus comprising a powder coating booth, a cyclone and / or a bag filter, and a connecting pipe for connecting the powder coating booth and the cyclone and / or a bag filter. A powder coating apparatus, wherein a wall surface of the powder coating booth is formed of a non-conductive material, and a bottom surface of the powder coating booth is flat. 2. The powder coating apparatus according to claim 1, wherein a scraper is provided on a bottom surface of the powder coating booth. 3. The powder coating apparatus according to claim 1, wherein at least one connecting pipe is connected to the powder coating booth. 4. The powder coating booth according to claim 1, wherein said connecting pipe is connected to at least one wall surface of said powder coating booth.
4. The powder coating apparatus according to any one of items 3 to 3. 5. The powder coating apparatus according to claim 4, wherein said connecting pipe is a straight pipe. 6. The powder coating apparatus according to claim 1, wherein said connection pipe is connected to a bottom surface of said powder coating booth.