JPS6045953B2 - Painting powder recovery device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for recovering excess powder that does not adhere to an object to be coated from among the powder discharged from a gun in a powder coating device such as an electrostatic powder coating device.

As shown in Fig. 1, as a method for collecting this type of surplus powder, the powder mixed with the air from booth a is sent by an exhaust fan b through an exhaust duct c to a collecting machine d. Collect and collect the powder on a belt f made of a serial type filter that accumulates on the outer surface of a cloth filter provided in the booth d or a belt f made of a cloth filter that moves in one direction to the bottom of the booth a as shown in FIG.
A type of separating type is known in which the collected materials collected on the belt f are sucked in through an intake port g and collected with air by another collecting machine. In the former case, it is often necessary to dust off the accumulated powder that has accumulated on the outer surface of the cloth filter medium.

In order to perform this powder removal while continuing powder coating, it is necessary to separate the inside of the recovery machine d into multiple chambers, and perform powder removal with only the chamber to be removed from the booth disconnected from the booth. However, this resulted in the inconvenience of the collection machine becoming larger and more complex. In the latter case, the accumulated powder is continuously removed by suction by the suction port, but not all the powder is completely suctioned, and especially the very fine powder is gradually absorbed into the inside of the cloth filter medium. After a long period of operation, the coating must be stopped, and the static pressure at the powder suction port must be increased to remove the powder from the cloth filter medium.

This problem has become a major bottleneck in the operation of powder coating equipment, especially as the particle size of powder coatings has become finer in recent years. The object of the present invention is to obtain a collection device free from such inconveniences, and a cloth filter material made of fiber material is provided in the powder equipment booth or in the collection machine following the powder equipment booth, and air flow is applied to the cloth filter material on the cloth filter material. In a type that collects and deposits excess coating powder, there is an injection nozzle that intermittently injects pressurized air to the surface opposite to the deposition surface of the cloth filter medium, a powder suction port facing the deposition surface, and A powder separation device configured as a wind shield to surround both and stabilize the airflow of each is installed in the powder coating booth or a recovery machine following it, and the separation device and the cloth filter medium are moved relative to each other. It is characterized by the following.

Figures 3 and 4 show the present invention applied to the above-mentioned series arrangement type, in which the excess powder A generated in the booth 1 is sucked into the recovery machine 3 along with the airflow through the duct 2. Ru.

This recovery machine 3 has an inner cylinder 5 rotatably supported within an outer cylinder 4.
The inner cylinder 5 is provided with a cloth filtering material 6 made of felt, woven fabric, non-woven fabric, etc. on its side surface, and the inner cylinder 5 is airtightly supported between the outer cylinder 4 and the outer cylinder 4 via a labyrinth backing 7.

Reference numeral 8 indicates an exhaust fan installed at the tip of a duct 9 that communicates with the inside of the inner cylinder 5. It is attracted by the filter material 6 and deposited on the outer surface of the cloth filter medium 6.

Reference numeral 10 denotes a powder separation device provided in the recovery machine 3 for separating the accumulated powder from the cloth filter medium 6. An injection nozzle 11 that intermittently injects pressurized air facing the cloth filter medium 6
, a powder suction port 12 facing the deposition surface, that is, the outer surface, of the cloth filter medium 6, and wind shielding covers 13 and 14 surrounding both of these 11 and 12 to stabilize the airflow, respectively, and an injection nozzle 11. is constructed by attaching a large number of injection ports 11b to the side surface of a vibrator 11a along the rotation axis direction of the cloth filter medium 6, and a powder suction port 12
is configured with a slit shape along the direction in which the jet 11b is disposed.

The inner cylinder 5 has a shaft 1 projecting downward from the lower center thereof.
5 is driven and rotated in conjunction with an external drive source 16.

Note that 17 indicates a falling powder receiver for receiving the separated powder.

In this case, the powder A supplied into the recovery machine 3 through the duct 2 is attracted to the outer surface of the cloth filter medium 6 by the suction force of the exhaust fan 8, and the deposition surface is removed by the rotation of the inner cylinder 5. moves to the powder separator 10 side. Then, there is mainly intermittent water from the injection nozzle 11. Powder A deposited by air jet
At the same time as the powder A is knocked off, the powder A is sucked into the powder suction port 12.
Aspirate and collect. The vibration caused by the intermittent jetting from the jetting nozzle 11 extends to other parts of the cloth filter medium 6 and shakes off the accumulated powder.

This powder A is caught at the bottom of the outer cylinder 5.
The one shown in FIG. 5 is an embodiment of a separate arrangement type, in which an endless belt-shaped cloth filter medium 6 that moves in the horizontal direction is provided at the bottom of the booth 1, and the cloth filter medium 6
A powder separator 10 having the same structure as that described above was provided at one end of the cloth filter medium 6 to collect the powder deposited on the cloth filter medium 6.

That is, an injection nozzle 11 that intermittently blows out air, which constitutes the powder separation device 10, faces the inner surface of the cloth filter medium 6, and a powder suction port 12 is provided on the upper surface of the cloth filter medium 6, facing the injection nozzle 11. With these, the powder deposited on the cloth filter medium 6 is recovered in the same manner as described above. In this case, powder suction port 1
A tip 12a made of a wear-resistant material such as Teflon was provided on the contact surface with the cloth filter medium 6 of No. 2. This is to reduce the contact resistance between the powder suction port 12 and the cloth filter medium 6, since in this embodiment, the powder on the cloth filter medium 6 is mainly separated and recovered by suction by the powder suction port 12. In the embodiment shown in FIG. 5, the cloth filter medium 6 is in the form of an endless belt and is movable in the horizontal direction. Alternatively, the powder separator 10 can be moved along the cloth filter medium 6.

In this way, according to the present invention, an injection nozzle that intermittently injects pressurized air to the surface opposite to the powder deposition surface of the cloth filter medium;
A powder separation device consisting of a powder suction port facing the deposition surface and a wind shielding cover that surrounds both to stabilize the airflow is installed in the powder coating booth, and the separation device and cloth filter material are installed in the powder coating booth. Since the air is intermittently injected from the injection nozzle, the powder accumulated on the fabric filter material is knocked off from the opposite side of the powder accumulation surface, and at the same time, the powder is removed by the powder suction port. It is possible to continuously separate and remove the powder that accumulates on the cloth filter medium by suction, and to keep the surface of the cloth filter medium clean at all times, without having to stop the coating equipment as seen in conventional examples. There is no inconvenience such as having to clean the cloth filter media, and by providing a wind shield that surrounds both to stabilize the airflow of each, the separation and recovery can be ensured without disturbing the airflow of both. It is effective because it can be done.

[Brief explanation of the drawing]

1 and 2 are side views of a conventional device, FIG. 3 is a cross-sectional side view of one example of the present invention, FIG. 4 is a cross-sectional view taken along the line ■-■, and FIG. 5 is another embodiment. A side view of the main part of the example, and FIG. 6 is an enlarged cross-sectional side view of a part thereof. DESCRIPTION OF SYMBOLS 1... Powder coating booth, 3... Collection machine, 6... Cloth filter medium, 10... Powder separator, 11... Injection nozzle, 12... Powder suction port.

Claims (1)

[Claims] 1 In a type in which a cloth filter made of fiber material is installed in a powder coating booth or a recovery machine following the booth, and excess coating powder is collected and deposited on the cloth filter by air flow, A powder filter consisting of a nozzle that intermittently injects pressurized air onto the opposite side of the filter media's deposition surface, a powder suction port facing the deposition surface, and a wind shielding cover that surrounds both of these to stabilize the airflow. 1. A coating powder recovery device, characterized in that a powder separation device is provided in a powder coating booth or a recovery machine following the powder coating booth, and the separation device and a cloth filter medium are moved relative to each other.