JPH01143662A - Electrostatic powder paint spray apparatus - Google Patents

Abstract

PURPOSE:To facilitate the operation such as discharging waste paint powder from a recovery container or maintenance work and also prevent the floor of a spray room from being covered with a large quantity of the excessive powder paint by locating a recovery container under the spray room. CONSTITUTION:A spray gun 1 for electrostatic powder paint is located in front of a spray room 2, and a suction room 3 is located in the rear thereof. A recovery container 4 for recovering the excessive powder paint and the spray gun 1 are connected together with a circulating pipe 5 and the recovery container 4 is located under the spray room 2. As a result, the operation such as discharging the waste powder from the recovery container or the maintenance work is made easy and also the excessive powder paint dropping itself is recovered as such in the recovery container so as to prevent the floor of the spray room from being covered with a large quantity of the excessive paint powder, thereby permitting a rapid paint color changeover operation. Moreover, the length of the circulating pipe connecting the recovery container and the spray gun 1 can be shortened, preventing the occurrence of clogging or breathing of the circulating pipe.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an electrostatic powder coating device.

[Conventional technology]

Conventionally, as an electrostatic powder coating device, as shown in Fig. 2,
The spraying chamber 5 has an electrostatic powder coating gun 51 installed on the front side.
2, a suction chamber 53 installed at the back of the chamber 52, a collection container 54 for collecting excess powder paint, and a circulation pipe 55 connecting the collection container 54 and the electrostatic powder coating gun 51. There is something that consists of Such a device is shown in Japanese Patent Publication No. 57-500229.

By the way, in the conventional device described above, the recovery container 54 is installed on the lower surface of the suction chamber 53. Among the excess powder paint that did not adhere to the object A in the spray chamber 52, the powder that fell onto the lower surface of the spray chamber 52 moves on the inclined floor 56, and the excess powder paint that did not adhere to the object A is sucked into the suction chamber 53. It is designed to be collected together with the powder paint into a collection container 54.

[Problem that the invention seeks to solve]

However, like the conventional device described above, the collection container 54
If it is installed on the lower surface of the suction chamber 53, the following problems arise.

That is, when the collection container 54 is installed on the lower surface of the suction chamber 53, the collection container 54 will be located on the back side of the spraying chamber 52, so that the electrostatic powder coating gun 51 will be removed from the collection container 54.
The length of the circulation pipe 55 becomes longer.

As a result, the powder coating material may become clogged in the middle of the circulation pipe 55, or a so-called "breathing" phenomenon may occur, resulting in a problem that the discharge stability of the powder coating material is poor.

In addition, the collection container 54 is usually equipped with a sieving device 57 on its upper surface, and from time to time it is necessary to discharge the sorted waste powder, garbage, etc.
4 is installed on the back side of the device, the operator has to go around to the back side of the device each time to discharge the waste powder, resulting in extremely poor work efficiency. In particular, since the electrostatic powder coating device is incorporated into the line as part of a continuous production line, it is extremely troublesome for the operator to go around to the back side of the device.

Furthermore, in the case of the above-mentioned conventional apparatus, since a large amount of powder paint is deposited on the inclined floor 56 on the lower surface of the chamber 52 by natural falling during spraying, the powder paint deposited on the inclined floor 56 may be removed by some method after the work is completed. It is necessary to drop it on the back side.

Therefore, the present invention aims to provide an electrostatic powder coating apparatus that solves the above-mentioned problems.

[Means for solving problems]

In this invention, in order to solve the above problems, a collection container is installed at the bottom of the spray chamber.

[Effect]

This places the collection container on the front side of the device.

Therefore, the distance from the collection container to the electrostatic powder coating gun is shortened, and the powder material does not become clogged in the circulation pipe and the phenomenon of suffocation does not occur.

Further, when discharging waste powder, garbage, etc. from the collection container, the work can be done from the front side of the device, which improves work efficiency.

Furthermore, since the collection container is provided on the lower surface of the spraying chamber, excess powder that has not adhered to the object to be coated falls naturally and is stored in the collection container as it is.

〔Example〕

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

The electrostatic powder coating apparatus of this invention includes an electrostatic powder coating gun 1
The spraying chamber 2 has a sprayer placed on the front side, the suction chamber 3 installed on the back side of the chamber 2, the collection container 4 for collecting excess powder paint, and the collection container 4 and the electrostatic powder coating It consists of a circulation pipe 5 that connects to the gun 1.

The object to be painted A is suspended from a conveyor device 6 installed above the chamber 2, and the sprayed object enters the chamber 2 through an open lower formed on the side wall of the chamber 2; Powder paint is sprayed from the electrostatic powder coating gun 1 at the step 1, and then drawn out from an opening formed in the other side wall.

The back side of the spraying chamber 2 is open, and the suction chamber 3 is installed so as to close this opening 8. The suction chamber 2 and the suction chamber 3 are configured to be detachable by a clamp S.

In addition, the floor 10 of the spraying chamber 2 is formed in a funnel shape,
A collection container 4 is installed in the central opening 11.

This recovery container 4 also has a clamp 12 attached to the chamber 2.
It is configured to be detachable.

Vehicles 13, 14, and 15 are attached to the lower parts of the spray chamber 2, suction chamber 3, and collection container 4, respectively, and each of them is movable in China and Germany.

The collection container 4 consists of a container body 16 with an open top surface, and a sieve device 17 is installed on the top surface of the container body 16. This sieving device 17 consists of a net 18 that covers the upper opening of the container body 16 and a pie break installed on the lower surface of this net 18. In addition, the container body 16
The interior near the bottom is partitioned by a perforated plate 20, and an air supply pipe 21 is inserted below this perforated plate 20, whereby air is blown upward through the perforated plate 20.
The powder paint contained within the container body 16 is designed to flow. An injector 22 for drawing out the powder coating material is inserted into the surface side of the container body 16, and the circulation pipe 5 is connected to the injector 22.

A protective net 23 is installed near the floor of the spraying chamber 2 in order to protect the sieve H temperature 17 of the collection container 4 in the event that the object to be coated A falls.

In addition, at the joint between the blowing chamber 2 and the collection container 4,
A packing 24 is attached.

On the other hand, a plurality of suction ports 25 are provided on the ceiling of the suction chamber 3. A lower suction box 27 and an upper suction box 28 are installed on the upper surface of the suction chamber 3. The upper suction box 28 is fixed to the frame 2S on the upper rear side of the spray chamber 2. A suction fan 30 is installed in this upper suction box 28. Further, a filter 32 is installed at a discharge port 31 provided on the back side of the upper suction box 28. The upper suction box 28 and the lower suction box 27 are communicated by a flexible duct 33. Further, the lower suction box 27 is suspended and supported by the upper suction box 28 by a spring 34.

An air supply pipe 35 for backflow is installed in the lower suction box 27, and this air supply pipe 35 is connected to the suction port 2 of the suction chamber 3.
A nozzle 36 is formed at each position facing 5.

A gasket 37 is provided at the connection between the upper surface of the suction chamber 3 and the lower surface of the lower suction box 27, and the two can be attached and detached by a clamp 38.

The floor 3S of the suction chamber 3 is sloped gradually downward from the back side to the front side, and its lower edge is continuous with the lower edge of the opening 8 on the back side of the chamber 2. ing. In addition, powder paint deposited on the floor 39 of the suction chamber 3 is deposited on the lower edge of the floor 3S of the suction chamber 3 when the suction chamber 3 is removed from the spray chamber 2 and the suction chamber 3 is moved. To prevent spillage, a fall prevention plate 40 is rotatably installed.

Next, the operation of the embodiment configured as described above will be explained.

Electrostatic powder - Of the powder paint sprayed from the application gun 1 onto the object A, most of the excess powder paint that did not adhere to the object A is placed on the top surface of the collection container 4 by gravity. The particles fall onto the net 18 of the sieving device 17 , are sorted by the sieving device 17 , and are then collected in the collection container 4 .

On the other hand, surplus powder paint floating in the spray chamber 2 is absorbed into the suction chamber 3 and adheres to the surface of the filter 26. Air is intermittently supplied to the air supply pipe 35 in the lower suction box 27, and when a large amount of excess powder paint adheres to the surface of the filter 26, air is blown out from the nozzle 36 of the air supply pipe 35. The excess powder coating material adhering to the surface of the filter 26 falls onto the floor 39 below the suction chamber 3. The surplus powder paint that has fallen onto the floor 39 slides on the floor 39 due to the force of the fall, falls onto the top of the collection container 4 together with the surplus powder coating that has accumulated on the floor 39, and is sorted by the sieving device 17. After that, they are collected in the collection container 4.

As described above, the collected excess powder paint is drawn out from the collection container 4 by the injector 22 and sent to the electrostatic powder coating gun 1 via the circulation pipe 5.

〔Effect of the invention〕

As described above, the present invention has the effect that since the collection container is installed on the lower surface of the spraying chamber, operations such as discharging waste powder from the collection container and maintenance are facilitated.

In addition, the length of the circulation pipe that connects the collection container and the electrostatic powder coating gun can be shortened, which eliminates clogging and breathing in the circulation pipe and improves discharge stability. There is also this effect.

Furthermore, since the collection container is installed at the bottom of the spraying chamber, excess powder paint that falls naturally is collected into the collection container, which prevents large amounts of excess powder paint from accumulating on the floor of the spraying chamber. Therefore, there is an effect that the color change work can be performed quickly.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, and FIG. 2 is a sectional view of a conventional example. 1... Gun for electrostatic powder coating, 2... Tube for spraying, 3... Suction chamber, 4... Collection container, 5... ...Circulation pipe, A...Object to be painted.

Claims (1)

[Claims] A spraying chamber with an electrostatic powder coating gun installed on the front side, a suction chamber installed at the back of this spraying chamber, a collection container for collecting excess powder paint, and this collection container and electrostatic powder. An electrostatic powder coating apparatus equipped with a circulation pipe connected to a coating gun, characterized in that the collection container is installed on the lower surface of a spraying chamber.