JPH08299888A - Powder coating equipment - Google Patents

Abstract

PURPOSE: To provide a powder coating equipment constituted so as to be capable of enhancing coating quality in powder coating. CONSTITUTION: In this powder coating equipment 1 equipped with a powder coating booth 2 applying powder coating to a work and a heating booth 22 provided on the downstream side of the powder coating booth 2 and heating the work W after powder coating, a separating intermediate chamber 42 which humidity is kept higher than that of the coating painting booth 2 is arranged between the powder coating booth 2 and the heating booth 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to powder equipment capable of improving coating quality in powder coating. In particular, the present invention provides an intermediate chamber between the powder coating booth and the heating booth, which cuts off the space between them.
The present invention relates to a powder coating facility that removes the floating powder paint around the work after powder coating to prevent the floating powder paint from being brought into the heating chamber as much as possible.

[0002]

2. Description of the Related Art Powder coating has hitherto been carried out as a method for coating large workpieces such as automobiles. The conventional powder coating technology includes Japanese Patent Publication No. 57-25265.
A technique disclosed in Japanese Patent Laid-Open No. 57-150479 is known. In the conventional powder coating technology, a work is powder coated in a powder coating booth, and the coated work is directly and continuously conveyed to a heating booth, which is the next step, for heat treatment.

[0003]

In the above conventional technique, the coated work is directly conveyed from the powder coating booth directly to the heating booth as it is, and heated to form a coating film. There is such an inconvenience. That is, around the work after powder coating, unpainted paint floats, and this floating unpainted powder paint adheres to the coated surface and heats while it remains adhered. On the surface of the obtained coating film, so-called spots or coating defects called spit may occur. As a result, the appearance quality of the coated product may be deteriorated.

The spots and spits on the painted surface are
Since the appearance of the coated product is impaired, it is necessary to perform work such as grinding after coating and heating, which is not preferable from the viewpoint of coating workability.

Therefore, it is considered to install a wet coating powder material collecting device in the powder coating booth, but in order to reuse the collected coating material, it is necessary to heat and dry the absorbed coating material. Therefore, there is an inconvenience that the recovery of the paint deteriorates. Also, if a wet coating powder material recovery device is installed in the powder coating booth, when the coating material is sprayed onto the work, the coating material causes blocking (aggregation) due to the moisture absorption effect due to moisture, causing a coating failure. Occurs. Further, due to the humidity, the charging efficiency of the paint is lowered, and the coating efficiency to the work is lowered.

The present invention has been made to solve such problems. The inventors of the present invention can directly bring the painted work from the coating booth for powder coating to the heating booth as it is, so that the paint powder floating around the work is directly brought into the heating booth. In view of the inconvenience of providing a wet recovery device inside,
By cutting the coating booth and the heating booth, it is possible to suppress the carry-in of floating paint in the heating booth, and at the time of cutting the edge, by setting the environment of the cutting edge to be wet,
The present invention was made based on the knowledge that the floating paint powder can be efficiently captured and removed.

An object of the present invention is, in the powder coating method, in transporting a painted work from a powder coating booth to a heating booth, an effect of invading floating powder paint accompanying the work transportation to the heating booth is effective. The present invention aims to provide a powder coating facility capable of preventing the formation of spots and spits due to the floating powder coating and improving the coating quality in powder coating.

[0008]

[Means for Solving the Problems] Means for solving the above problems are as follows: a powder coating booth for powder coating a work, and a powder coating booth provided downstream of the powder coating booth. In a powder coating facility equipped with a heating booth for heating the work afterwards, between the powder coating booth and the heating booth, an edging intermediate chamber maintained at a higher humidity than the powder coating booth is provided. This is the powder coating equipment that was placed.

Further, the powder coating equipment is provided with an air curtain between the coating booth and the intermediate chamber.

[0010]

According to the above-mentioned means, the intermediate chamber is provided between the powder coating booth and the heating booth so as to cut off the space between the powder coating booth and the heating booth, and the intermediate chamber is maintained at a higher humidity than that of the coating booth. Floating powder paint around the periphery of a large work such as the body of an automobile is rapidly dropped and removed by the moisture absorption effect of moisture in the intermediate chamber, and the carry-in of the floating paint to the heating booth is drastically reduced.

Further, by arranging the air curtain between the intermediate chamber and the coating booth, when the work is transferred from the coating booth to the intermediate chamber, carry-in of powder coating powder floating around the workpiece into the intermediate chamber is suppressed. As a result, the carry-in of the floating powder coating material from the intermediate chamber to the heating booth can be further suppressed or prevented.

[0012]

An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 is an explanatory plan view of equipment according to the present invention, FIG. 2 is a sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is 3-3 of FIG.
4 is a sectional view taken along line 4-4 of FIG. 1, and FIG. 5 is a sectional view taken along line 5-5 of FIG.

As shown in the plan view of FIG. 1, the powder coating equipment 1 according to the present invention comprises a powder coating booth 2 from the upstream side,
The intermediate chamber 42 is arranged continuously to the downstream side, and the heating booth 22 is arranged continuously to the downstream side.

FIG. 2 is a sectional view showing an example of the powder coating booth 2. The booth 2 is a coating chamber 3 extending in the front and back direction of the drawing.
And a large work W such as a car body of the automobile is carried into the coating chamber 3 via the rail 15 by the carrier 4 or the like. The work W is carried into the coating chamber 3 as a clean work W through pretreatment work such as degreasing, dust removal, and the like cleaning in the upstream pretreatment process. In the coating chamber 3 and the powder coating supply chamber 5 arranged on the side of the coating chamber 3, powder coating 6 is stored in a supply tank 6a and the like, and the ceilings 7 of the coating chamber 3 and the coating powder supply chamber 5 are It is formed by a perforated plate or the like. Ceiling 7
On the upper side of the branch pipe 10, 1 equipped with an air main 8 and a valve 9.
0 is provided to communicate with the ceiling 7 and air is supplied to the coating chamber 3 and the powder coating supply chamber 5.

The powder coating 6 is sprayed onto the work W by the coating gun 16. In this case, the coating gun 16 is provided with an electrode for applying a high voltage, and the powder coating material floating in the coating chamber 3 is charged. On the other hand, the work W is grounded, the charged powder coating is attached to the surface of the work, and powder coating is executed.

In FIG. 2, the floor 11 of the coating chamber 3 and the coating powder supply chamber 5 is formed of a perforated plate, and the floating coating powder is sucked by the blower 13 in the recovery pipe 12 under the floor to booth 2.
It was collected in the collecting hopper 14 provided on the top of the above to eliminate the waste of the paint powder. In the above powder coating, for example, air with a wind speed of 0.3 m / sec is supplied from the top to the bottom, and the temperature is 25 ° C., and the coating is a modified polyester powder manufactured by Nippon Paint. Paint was used.

The work W coated with powder in the above powder coating booth 2 is conveyed into the heating booth 22 which is the next step. The transfer is performed by the transfer carriage 4 on which the work W is placed and supported, and the rail 15 for the carriage is arranged from the coating booth 2 to the heating booth 22. The heating booth 22 is arranged on the downstream side of the coating booth 2 with a space therebetween.
2 shows an illustrative cross-sectional view of FIG.

The heating booth 22 is a double structure having an outer housing 23 and a heating chamber 24. The heating booth 22 is provided with a passage groove 25a for the carriage 4 at the center of a floor 25. It is sent into the room and heated to form a coating film. A space 26 is provided between the outer housing 23 and the heating chamber 24, and an upper ventilation pipe 2 is provided in a ceiling portion of the outer housing 23.
7 is provided, for example, an electric heater 28 is provided in the ventilation pipe 27, air is supplied from the upstream side of the ventilation pipe 27, and the electric heater 28 warms the air.
Supply to.

A peripheral wall of the heating chamber 24 facing the work W is formed of a perforated plate or the like, and hot air is introduced into the heating chamber 24 by vent holes 29 ...
To heat the surface of the work W,
The paint powder adhered to the surface of is melted by heating with hot air,
It is fixed and a coating film is formed on the surface. In the embodiment, the hot air heating method is adopted, but the heating method such as infrared heating is optional.

Between the coating booth 2 and the heating booth 22 as described above, an intermediate chamber 42 for cutting the edge between the coating booth 2 and the heating booth 22 is arranged. An explanatory sectional view of an example of the intermediate chamber 42 is shown in FIG. The intermediate chamber 42 does not require a powder paint supply facility or a hot air supply facility in the ceiling portion, and thus the width is set narrower than that of the coating booth 2 and the heating booth 2.

The intermediate chamber 42 is a tunnel-shaped housing 43.
The floor 44 is formed of a perforated plate, and a water tank 45 is provided below the floor. The water tank 45 is provided with a stay portion 4a of the carriage 4 at the center.
Since it passes through, it is divided into two parts, the left and right, and the left and right water reservoirs 4
Water is stored in 5a and 45b at an appropriate level. The water in the water storage tank 45 is circulated by a pump 46, and a filter 46 for removing the powder paint contained in the water is provided upstream of the pump 47 in the circulation conduit 48.

The above intermediate chamber 42 is arranged between the coating booth 2 and the heating booth 22 so as to connect both booths 2 and 22. The upstream portion 42a of the intermediate chamber 42 is continuous with the downstream portion 2a of the coating booth 2, and the downstream portion 42b of the intermediate chamber 42 is continuous with the upstream portion 22a of the heating booth 22.
The rail 15 is laid in the intermediate chamber 42 and the heating booth 22, and the trolley 4 on which the work W is placed and supported continuously connects the coating booth 2, the intermediate chamber 42, and the heating booth 22 or feeds the work W by tact feeding. Transport.

An air curtain 52 is provided at the boundary between the coating booth 2 and the intermediate chamber 42 (the outlet of the coating booth 2 and the inlet of the intermediate chamber 42). This is shown in FIG. The air curtain 52 is installed on the ceiling part of the boundary between the coating booth 2 and the intermediate chamber 42 so as to cross the air discharge nozzle 53 in the width direction, and the compressed air is flown from the top to the bottom as shown by the arrow. Make up. On the other hand, so as to face the nozzle 53,
A jet air suction port 54 for an air curtain is installed on the floor, and the nozzle 53 and the suction port 54 are connected to an air circuit 55.
In the air circuit, a blower 56 and an air filter 57 for removing the powder paint in the suction air are provided.

In the above, the work W carried out from the coating booth 2 after the painting and the carriage 4 are carried into the intermediate chamber 42 under the air curtain 52, and the powder coating floating around the work W is covered with the air curtain 52. 4 in the middle chamber
Carry-on to 2 is temporarily blocked. Air curtain 52
As described in the embodiment, by configuring the nozzle 53 and the suction port 54 provided directly below the nozzle 53, the air flowing from the top to the bottom can have directivity directly below, and the blocking performance can be improved. A good, strong air curtain can be constructed.

In the embodiment, the coating booth 2 and the intermediate chamber 4
The air curtain 52 is provided between the intermediate chamber 42 and
An air curtain may be provided between the heating booth 22 and the heating booth 22, and it is preferable to provide the air curtain.

By the way, in the intermediate chamber 42, the water tank 45 is provided under the floor of the room, and therefore, the inside of the intermediate chamber 42 is kept at a higher humidity than the atmosphere in the coating booth 2. For example, the inside of the intermediate chamber 52 was kept in an atmosphere having a humidity of 80%, a temperature of 25 ° C., and a wind speed of 0.3 m / sec.
Further, regarding the length of the intermediate chamber 42 in the conveyance direction of the work W, when the work W is a vehicle body, it is preferable to set the length of the intermediate chamber 42 to be equal to or longer than the length of the vehicle body.

By the way, the work W carried into the intermediate chamber 42 is in a state where the powder coating material is suspended in the peripheral portion. The floating powder coating around the work W has a high humidity in the atmosphere in the intermediate chamber 42, so that the powder absorbs water and has a large specific gravity to promptly drop downward. As a result, the floating powder coating material brought into the intermediate chamber 42 from the coating booth 2 with the movement of the work W is stored in the water tank 45 on the floor or under the floor.
It will fall to and will be mostly removed. In particular, as described above, when the work W is the vehicle body of the automobile and the length of the intermediate chamber 42 is set to be equal to or more than the length of the vehicle body, compared with the case where the intermediate chamber is set to be equal to or less than the length of the vehicle body, It is possible to obtain a powder powder coating having a high trapping rate due to the high humidity atmosphere in the intermediate chamber.

As a result of the above, the carry-in of the floating powder paint into the heating booth 22 which is continuous with the intermediate chamber 42 is greatly reduced, and the generation of the spots and the spits due to the floating powder paint is drastically reduced. Specifically, as in the conventional case, the coating booth 2 and the heating booth 22 are directly connected to each other, and the work after powder coating is continuously carried directly into the heating booth and heated to form a coating film. Generated 100 spits per 1 m ² , but in the present invention, this was drastically reduced to 10 to 15.

Although the embodiment has been described above, as shown by an imaginary line in FIG. 3, an air conditioning means 49 for sending air from the top to the bottom may be provided in the intermediate chamber 42. When such an air conditioner 49 is provided, the fall of the floating powder paint is promoted, and the effect of removing the floating powder paint is further enhanced. Further, in the embodiment, the water tank 45 is provided under the floor in the intermediate chamber 42, but instead of this, an atomizing device may be provided in the intermediate chamber, or a humidifying device such as the above-mentioned generating device may be provided.

[0030]

As is apparent from the above, according to the present invention, in powder coating of a work such as an automobile body, between a coating booth for performing powder coating and a heating booth after coating, An intermediate chamber is placed between the painting booth and the heating booth to keep the humidity higher than that of the painting booth. Is rapidly dropped downward due to the moisture absorption effect in the intermediate chamber, and the floating powder paint is largely removed.

As a result, the carry-in of the floating powder coating material into the heating booth is significantly reduced, the generation of spots, spits, etc. generated in the coating film of the powder coating product is drastically reduced, and the coating quality of the powder coating product is greatly reduced. Can be improved. As a result,
Grinding and removing work such as spots and spits is greatly reduced, work after painting becomes easy, and workability is also good.

Further, since the air curtain is provided between the coating booth and the intermediate chamber, the carry-in of the floating powder paint from the coating booth to the intermediate chamber is drastically changed. It is possible to effectively prevent the floating powder paint from being brought into the booth, and there are few spots and spits.
High quality powder coated products can be obtained.

As a result, the carry-in of the floating powder coating material into the heating booth is drastically reduced, so that the adhesion of the floating powder coating material into the heating booth is reduced and the heating booth is not contaminated by the coating material. It also has the effect of facilitating maintenance of the heating booth.

[Brief description of drawings]

FIG. 1 is an explanatory plan view of a powder coating facility according to the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a sectional view taken along line 4-4 of FIG.

5 is a sectional view taken along line 5-5 of FIG.

[Explanation of symbols]

1 ... Powder coating equipment, 2 ... Powder coating booth, 22 ... Heating booth, 42 ... Intermediate chamber, 52 Air curtain.

Claims (2)

[Claims] 1. A powder coating system comprising: a powder coating booth for performing powder coating on a work; and a heating booth provided downstream of the powder coating booth for heating the work after the powder coating. A powder coating facility, wherein an intermediate chamber for edging that is maintained at a higher humidity than the powder coating booth is disposed between the powder coating booth and the heating booth. . 2. The powder coating facility according to claim 1, wherein an air curtain is provided between the coating booth and the intermediate chamber.