JPH11253855A - Coating booth for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress or prevent the deposition of a powder paint on the wall of a coating booth at the time of powder-coating an automobile body and further to facilitate such operation as the cleaning in the booth. SOLUTION: In the coating booth 1 for an automobile, the walls 6 and 7 on both sides of the coating chamber 10 for electrostatically power-coating an article 22 and the wall 26 of the collecting chamber for collecting the excess powder paint are formed with PVC. Consequently, the walls 6 and 7 and 26 are prevented from being electrically charged, and the deposition of the fine particles on the wall 6 and 7 and 26 due to the electrostatic attraction is obviated. Further, a self-traveling truck is provided in the booth, and the operation such as the cleaning in the booth is easily performed by an operator.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating booth for an automobile for coating the body of an automobile with powder paint.

[0002]

2. Description of the Related Art Generally, in the coating of an automobile body, a body to be coated is first subjected to a surface treatment using zinc phosphate or the like, and then a primer is applied by electrodeposition coating. Further, a middle coat is applied, and finally a top coat is applied. Here, as the intermediate coating, a powder coating using a powder coating has been widely used in recent years. However, powder coating is extremely preferable from the viewpoint of environmental protection because no solvent is contained in the powder coating, and it is extremely easy to collect and reuse excess powder coating.

[0003] As such powder coating, conventionally, a coating gun (electrostatic coating machine) is used in a coating booth.
The fine particles of the charged powder paint are attached to the charged or grounded object with the opposite characteristic to the fine particles by electrostatic attraction, and thereafter, the object to which the powder paint adheres. In a heating furnace (baking furnace), electrostatic powder coating in which a powder coating is melted and fixed to an object to be coated is widely used.

Further, in such electrostatic powder coating, it is impossible to make all the fine particles of the powder coating sprayed from the coating gun adhere to the object to be coated. Many powder coatings are sprayed. For this reason, in the coating booth, a collecting chamber for collecting excess powder paint is provided below the coating chamber. The powder coating material collected in the collection chamber is usually collected and reused.

[0005]

By the way, in the conventional electrostatic powder coating apparatus for a vehicle for coating the body of the vehicle, the coating chamber and the collecting chamber are basically coated on the surface. It is formed of a metal plate such as a steel plate. Therefore,
Since the electric charge easily moves in the walls of the coating chamber and the collecting chamber, if any member (for example, a supporting column) in contact with the wall is charged, the electric charge in the member is applied to the entire wall. The wall spreads and the wall is fully charged. Here, if the charging characteristics of the wall portion and the charging characteristics of the powder coating particles are opposite in polarity and the wall portion is grounded, the powder coating particles firmly adhere to the wall portion by electrostatic attraction, There is a problem that it is extremely difficult to remove the powder coating from the wall during cleaning.

In a conventional automobile painting booth, an operator enters a painting room for cleaning, maintenance of the painting machine, and the like. In this case, since the total height of the coating room is considerably high, when cleaning a high place or the like, the operator must perform the operation using a ladder, a stepladder, or the like, and there is a problem that the operation is troublesome.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and suppresses or prevents the adhesion of powder coating to the wall of a coating booth when applying powder coating to the body of an automobile. It is an object of the present invention to provide a coating booth for an automobile that can perform cleaning and other operations in the coating booth easily.

[0008]

An automobile painting booth according to the present invention, which has been made to solve the above problems, comprises:
(A) An automobile painting booth for applying a paint to a body of an automobile to be coated with a powder paint,
(B) a coating chamber for coating the object to be coated, and one or a plurality of collectors disposed below the coating chamber for collecting excess powder paint (powder paint that has not adhered to the object to be coated). And (C) the wall of the collection chamber is formed of resin (plastic). here,
The coating of the object to be coated is preferably performed by electrostatic powder coating in which the charged fine particles of the powder coating are adhered to the surface of the object by electrostatic attraction.

The number of collecting chambers provided in the coating booth may be one or more, but it is preferable that the number of collecting chambers be plural when the booth width is large. Since the bottom of the collection chamber is usually shaped like a hopper or tapered shape that narrows downward, if the booth width is large and there is only one collection chamber, the height of the collection chamber will increase, This is because the height of the booth must be increased. When a plurality of collecting chambers are provided, only the powder paint collected in the collecting chamber arranged in a part where the amount of dust is particularly small is collected and reused, and collected in other collecting chambers. The applied powder coating may be discarded. In this way, the powder coating can be recovered in an extremely high quality state.

In this coating booth, it is preferable that the wall of the coating chamber be formed of resin in addition to the wall of the collecting chamber.
As a resin for forming these wall portions, for example, polyvinyl chloride can be used. In addition, the inner surface of the wall portion made of such a resin (the surface in contact with the powder paint)
Is preferably a smooth surface. In addition, such a smooth surface is
It can be easily formed by subjecting the inner surface of the wall to a surface treatment for smoothing.

In this coating booth, the wall of the collection chamber is made of a resin such as polyvinyl chloride. However, since the resin is an insulator, the electric charge is hard to move in the wall. Therefore, even when the wall is in contact with the charged material, the charge of the charged material does not spread into the wall. For this reason, the excessive powder paint that has not adhered to the object to be coated is suppressed or prevented from firmly adhering to the wall of the collection chamber due to the electrostatic attraction force, and it is extremely easy to clean the collection chamber. At the same time, the collection rate or the recovery rate of the powder coating is increased. Also, if the wall of the coating room is also made of resin such as polyvinyl chloride,
This facilitates cleaning of the coating chamber and further increases the recovery rate of the powder coating. If the inner surface of the collection chamber or the wall of the coating chamber, that is, the surface in contact with the powder coating is a smooth surface, the powder coating adhering to the wall is sprayed with air, Since it can be easily removed by wiping with a sponge or the like, cleaning of the collection chamber or the coating chamber is further facilitated.

In the above-mentioned automotive coating booth, it is preferable that an insulating means for suppressing or preventing the movement of electric charges in the wall is provided on the resin wall. Examples of such insulating means include a hollow portion formed in the wall portion (the wall portion has a double wall structure sandwiching the hollow portion). Alternatively, an insulating filler formed in the wall may be used. With this configuration, the charging of the resin wall of the collection chamber or the coating chamber is more reliably prevented, and the collection chamber or the coating chamber is more easily cleaned.

In the above-mentioned coating booth for automobiles, it is preferable that an object transporting trolley (for example, a slat conveyor) for transporting the object to be coated in the coating booth is provided. In this way, a heavy object to be coated (an automobile body) can be easily transported in the coating booth.

[0014] In the above-mentioned coating booth for automobiles, it is preferable that a forced air supply device for forcibly supplying outside air into the coating room is provided at the ceiling of the coating room. Here, it is preferable to introduce the outside air over the entire surface of the ceiling. In this way, the downdraft in the coating chamber becomes stable. For this reason, the spray pattern (spray pattern) of the powder coating from the coating gun is stabilized, and the quality of the coating film is improved. In the case of powder paint, the spray pattern is softer than that of liquid paint,
Stabilizing the descending airflow in this way is very effective in improving the film quality of the coating film.

In the coating room or the forced air supply device,
It is preferable that a dust filter for removing floating dust in the outside air supplied to the coating chamber is provided. This prevents dust from being mixed into the coating film and prevents dust from being mixed into the recovered powder coating. More preferably, the coating room or the forced air supply device is provided with an air conditioner for adjusting the temperature and humidity of the outside air supplied to the coating room. In this way, the temperature and humidity of the outside air supplied to the coating room are constant regardless of the season or the climate. Therefore, the coating conditions can be stabilized, and the film quality of the coating film can be stabilized.

The above-mentioned painting booth for automobiles is provided with a lifting means (for example, an electric lifting type table lifter or a gondola, etc.) which can be moved up and down by carrying an operator, so that the work can run by itself in the painting booth. Preferably, a carriage is provided. This makes it easy for the operator to clean the inside of the coating booth, maintain the coating machine, and perform other operations. Further, since the worker can move without directly contacting the coating room or the collecting room, it is possible to prevent the worker from bringing dust (dust) into the coating room or the collecting room. Further, since the elevating means is provided, cleaning at a high place in the coating booth, maintenance of the coating machine, and the like are facilitated.

In the above-mentioned automobile painting booth,
(A) a bottom portion of the collection chamber is formed in a hopper shape narrowing downward, and a powder paint discharge port for discharging the powder paint in the collection chamber is formed at a lower end portion of the bottom portion; ) Outside the collection chamber, a duct connected to the powder paint outlet,
(C) a collecting device connected to the duct for collecting the powder coating material is preferably provided. Here, for example, a cyclone or a bag filter can be used as the collection device. This facilitates the collection of the powder coating.

In the above-mentioned coating booth for automobiles, (a) the bottom of the collecting chamber is formed in a hopper shape in which the bottom is narrowed downward, and the powder coating is collected and the collected powder coating is appropriately collected. A powder paint collecting filter that can be dropped at the bottom of the collecting chamber is provided, and (b) a powder paint discharging mechanism that discharges the powder paint dropped at the bottom of the collecting chamber to the outside of the collecting chamber is provided. It may be. Here, the powder paint discharging mechanism includes, for example, a screw feeder that collects powder paint in the collection chamber, and a rotary valve that discharges the powder paint collected by the screw feeder to the outside of the collection chamber. What can be used. Also in this case, the collection of the powder coating becomes easy. Further, in this case, the installation area of the painting booth system can be reduced, and the painting booth can be made compact. Further, since there is no need to provide a duct for transporting the recovered powder coating by a high-speed airflow, the quality of the recovered powder coating does not deteriorate due to the transport in the duct. The reason why the quality of the recovered powder paint deteriorates when transported by a duct is that the powder paint particles collide with each other at a high speed in the duct, so that the particle shape of the powder paint is damaged.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below. (First Embodiment) First, a first embodiment of the present invention will be described with reference to FIGS. In the following, for convenience,
The left side and the right side in FIG. 1, FIG. 4 or FIG. 5 are referred to as “left side” and “right side” of the coating booth 1, respectively.
In addition, the front side (the right side in FIG. 2) and the back side (the left side in FIG. 2) of the paper surface in the direction perpendicular to the paper surface of FIG. 1, FIG. 4 or FIG.
I will say that.

As shown in FIGS. 1 and 2, a two-story building 2 is provided in an automobile painting booth 1 for applying electrostatic powder coating to the body of an automobile. Slightly below the center in the direction, a main stage 3 is provided for partitioning a first-floor part (collecting part) and a second-floor part (painting part). A ceiling 4 is provided inside the second floor of the building 2 (above the main stage 3).
The rectifying filter 5 is provided slightly below. Also,
Below the rectifying filter 5, a first wall portion 6 (panel) and a second wall portion 7 (panel) made of polyvinyl chloride are provided extending vertically from the rectifying filter 5 to the main stage 3, respectively. . Here, transparent polyvinyl chloride is used for the walls 6 and 7.

Thus, in the building 2, the air supply chamber 8 is formed above the ceiling 4, and the ceiling 4 is viewed in the up-down direction.
An outside air introduction chamber 9 is formed between the rectifying filter 5 and the rectifying filter 5. A coating room 10 is formed between the rectifying filter 5 and the main stage 3 and between the wall portions 6 and 7. Further, between the rectifying filter 5 and the main stage 3, the first coating equipment room 1 is located on the left side of the first wall 6.
The second coating equipment room 1 is formed on the right side of the second wall 7.
2 are formed.

The ceiling portion 4 is provided with a plurality of forced air supply devices 13 each having a dust filter. These forced air supply devices 13 forcibly supply outside air from the air supply chamber 8 to the outside air introduction chamber 9. At the same time, the airborne dust in the outside air is removed by a dust filter. In this way, the air introduced into the outside air introduction chamber 9 after the suspended dust has been removed is rectified by the rectification filter 5 into a downward airflow having a uniform downward velocity distribution, and the coating chamber 10 and both the coating equipment chambers 11, 12
Supplied to Note that the rectifying filter 5 also removes floating dust in the air.

On the left side wall of the building 2, two maintenance stages 14, 15 and a booth illumination window 16 are provided. On the other hand, two maintenance stages 17 and 18 and a booth illumination window 19 are also provided on the right side wall of the building 2.

A conveyor 20 (slat conveyor) extending in the front-rear direction of the coating booth 1 is provided in a lower part of the coating room 1 (almost at the same height as the main stage 3), and a conveyor 21 is provided on the conveyor 20. Have been. Then, the heavy vehicle body, that is, the object 22 to be coated, is automatically conveyed forward by the transfer cart 21. Here, a plurality of coating guns 23 (electrostatic coating machines) are arranged above, to the left of, and to the right of the workpiece 22.

In the coating booth 1, grating is not particularly required. However, if desired, a grating 24 may be provided in the lower part of the coating room 10 and the coating equipment rooms 11 and 12. An outside air supply device for introducing outside air upward into a portion of the coating room 10 around the conveyor below the conveyor 20 to generate a positive pressure around the conveyor to prevent powder paint from adhering to the conveyor 20. 25
Is provided.

Thus, when the article 22 is being transported forward by the transport trolley 21, charged fine particles of the powder paint are ejected from each of the coating guns 23 toward the article 22. Most of the fine particles of the powder coating adhere to the surface of the workpiece 22 by electrostatic attraction. The object 22 to be coated is charged or grounded with characteristics opposite to those of the fine particles of the powder coating.

The coating booth 1 is provided with a collecting mechanism for collecting excess powder coating. That is, two collection chambers 26 are provided below the coating chamber 10 for collecting the surplus powder paint in the coating chamber 10, respectively. The walls of these collecting chambers 26 are formed of polyvinyl chloride. The polyvinyl chloride may be transparent or opaque. In each collection chamber 26, a cartridge filter 27 and an exhaust duct 28 are provided. These exhaust ducts 28 are each sucked by a blower (not shown) at the time of painting. Thus, at the time of coating, the air in the coating chamber 10 is discharged to the outside via the collection chamber 26, the cartridge filter 27, and the exhaust duct 28 by the blower.

At this time, the surplus powder paint in the coating chamber 10, that is, the powder paint that has not adhered to the work 22, enters the collection chamber 26 by such an air flow, and then enters the cartridge filter 27. Is almost completely trapped. Therefore, the air discharged to the outside via the discharge duct 28 contains almost no powder paint.

The powder coating material collected by the cartridge filter 27 is separated from the cartridge filter 27 by appropriately purging air in a reverse direction through an exhaust duct 28 when the coating operation is stopped. The paint falls and accumulates on the bottom of the collection chamber 26. here,
The bottom of each collection chamber 26 is formed in a hopper shape (tapered shape) that narrows downward, and a screw feeder 29 is provided near the lower end (valley bottom). Thus, the powder paint deposited on the bottom of the collection chamber 26 is supplied to the screw feeder 2.
The powder paint is collected at the center in the front-rear direction by 9, and the collected powder paint is discharged out of the coating booth 1 by the rotary valve 30 and the collected powder conveying pipe 31. The powder paint discharged outside the coating booth 1 in this manner is collected and reused.

Also, one collecting chamber 26 is provided below each of the coating equipment chambers 11 and 12, and each of the collecting chambers 26 is provided.
On the other hand, similarly to the case of the coating room 10, the cartridge filter 27, the exhaust duct 28, the screw feeder 29, the rotary valve 30, and the collected powder conveying pipe 3
1 is provided. However, the powder coating material collected in the collection chamber 26 below these two coating equipment rooms 11 and 12 is discharged to the outside of the coating booth 1 and discarded (that is, not collected and reused). The powder paint is discarded because an operator may enter both the equipment chambers 11 and 12 at the time of painting. Therefore, dust or trash introduced by the operator is mixed in the powder paint. It is because there is a possibility that there is.

In this collecting mechanism, there is no need to provide a duct for airflow transport of the collected powder paint, so that the installation area of the coating booth system can be reduced, and the coating booth 1 can be made compact. can do. Further, the quality of the recovered powder coating does not deteriorate due to the duct transportation using the high-speed airflow.

By the way, as described above, the first wall 6
Although the second wall 7 and the collection chamber wall 26 are both formed of polyvinyl chloride, these walls 6, 7, 2
The hollows 6 are formed with hollow portions (insulating means) for suppressing the movement of electric charges in the walls 6, 7, and 26, respectively.
That is, as shown in FIG. 3, these walls 6, 7, 2
6 has a thickness (width or interval) of 100 mm between two polyvinyl chloride plates 32 each having a thickness of about 10 mm.
It has a double wall structure in which a hollow portion is formed. Although not shown, ribs are provided between the polyvinyl chloride plates 32 to keep the thickness of the hollow portion 33 constant and to increase the strength or rigidity of the wall portions 6, 7, 26. ing. As described above, the polyvinyl chloride plate 32
Is transparent, so that the inside of the coating room 10 or the collection room 26 can be visually checked. Further, the inner surfaces of these walls 6, 7, 26, that is, the space in the coating chamber 10 or the collection chamber 26
The surface of the polyvinyl chloride plate facing the inner space is smoothed by the surface treatment, and the surface is smooth. In addition,
The wall of the collection chamber 26 may be formed of a single polyvinyl chloride plate instead of having a double wall structure.

As shown in FIG. 4, the painting booth 1 is provided with a work cart 35 for performing operations such as cleaning of the inside of the painting chamber 10 and maintenance of the painting gun 23. The worker trolley 35 can move freely on the conveyor 20 in the front-rear direction. A table lifter 37 (elevating means) provided with an elevating mechanism 36 is mounted on the work cart 35, and the table lifter 37 can be freely moved up and down by carrying an operator 38 thereon. Thus, the operator 38 moves the work cart 35 in the front-rear direction and stops at a desired position, and raises and lowers the table lifter 37 to stop at a desired height. In this position, operations such as cleaning of the interior of the coating chamber 10 and maintenance of the coating gun 23 can be easily performed. At the time of such work, the worker 38
Can move without directly contacting the components of the coating room 10 or the collection room 26, so that dust (dust) is prevented from being brought into the coating room 10 or the collection room 26 by an operator.

Incidentally, as shown in FIG.
In addition, a work gondola 40 having a lifting function may be mounted. In this case, as in the case of the table lifter 37 shown in FIG. 4, the worker 38 moves the work cart 35 by itself in the front-rear direction, stops at a desired position, and raises and lowers the work gondola 40. The operation is stopped at a desired height, and operations such as cleaning the inside of the coating chamber 10 and maintenance of the coating gun 23 can be easily performed at an arbitrary position in the coating chamber 10.

Further, an air pump (blower) or the like is mounted on the work cart 35 (cleaning cart), and while the work cart 35 is running, the air pump and the coating gun 23 are applied by the air pump.
The inside of the coating room 10 may be automatically cleaned by air blowing.

As described above, in the coating booth 1 according to the first embodiment, only the surplus powder coating in the coating chamber 10 is reused, and the coating equipment room 11 in which dust or dirt may be mixed is used. Since the 12 powder coatings are discarded, the powder coatings are collected in good quality.

In the painting booth 1, the painting room 1
Each of the side walls 6 and 7 facing 0 and the wall of the collection chamber 26 are formed of polyvinyl chloride which is an insulator, and a hollow portion 33 is formed between two polyvinyl chloride plates 32. Because of the double wall structure, these walls 6, 7, 2
In 6, the charge is extremely difficult to move. Therefore, even when the walls 6, 7, 26 are in contact with the charged material, the charges of the charged material do not spread into the walls 6, 7, 26. For this reason, the excessive powder paint that has not adhered to the workpiece 22 is suppressed or prevented from firmly adhering to these walls 6, 7, and 26 by the electrostatic attraction force. Therefore, cleaning of the coating chamber 10 or the collection chamber 26 becomes extremely easy, and the recovery rate of the powder coating material is increased.

Further, the inner surfaces of both walls 6, 7 and the collecting chamber wall 26, that is, the surfaces that come into contact with the powder coating material are smooth surfaces, so that these walls 6, 7, 26 are formed. The powder paint adhering to the coating chamber can be easily removed by blowing air or wiping with a sponge.
Or, the cleaning of the collection chamber 26 is further facilitated.

Further, in the coating booth 1, the air supplied from the outside air introduction chamber 9 to the coating chamber 10 is rectified by the rectifying filter 5 into an airflow having a uniform downward flow velocity distribution. The airflow becomes stable. Therefore, the spray pattern (spray pattern) of the powder coating from the coating gun 23 is stabilized, and the film quality of the coating film is improved. Further, the air from which the suspended dust has been removed by the dust removal filter or the rectification filter 5 of the forced air supply device 13 is supplied to the coating chamber 10, so that dust is prevented from being mixed into the coating film and the collected powder is removed. Dust is prevented from entering the paint.

In the coating booth 1, the air supply chamber 8, the outside air introduction chamber 9, or the forced air supply device 13 may be provided with an air conditioner for adjusting the temperature and humidity of the air. In this way, the temperature and humidity of the air supplied to the coating booth 1 (coating room 10) are made constant regardless of the season or the climate. Therefore, the coating conditions can be stabilized, and the film quality of the coating film can be stabilized.

(Embodiment 2) Hereinafter, Embodiment 2 of the present invention will be described with reference to FIG. However,
Most or basic parts of the painting booth 1 according to the second embodiment are the same as those of the painting booth 1 according to the first embodiment shown in FIGS. 1 to 5. Only the points different from the first embodiment will be described. In addition, in each component of the coating booth 1 shown in FIG.
Components common to those of the coating booth 1 shown in FIGS. 1 to 5 are denoted by the same reference numerals.

As shown in FIG. 6, in the coating booth 1 according to the second embodiment, the configuration of the collection chambers 43 provided below the first coating equipment room 11 and the second coating equipment room 12, respectively. This is different from the case of the first embodiment. That is, the size of the collection chamber 43 in the vertical direction is smaller than that of the collection chamber 26 of the first embodiment, and most of the dimensions are in a hopper shape (taper shape).
It consists of a bottom. The collection chamber 43 is not provided with the cartridge filter 27 and the exhaust duct 28 that collect the powder coating as in the first embodiment.

However, the lower end (bottom) of the bottom of the collection chamber 43 communicates with the airflow duct 44, and the tip of the airflow duct 44 is connected to a cyclone (not shown) or a bag filter (not shown). ing. Thus, the air containing the surplus powder paint in both the coating equipment chambers 11 and 12 is introduced into the cyclone or the bag filter through the collection chamber 43 and the airflow duct 44, and the air in the cyclone or the bag filter is released from the air. Of powder paint are collected. The powder paint collected in this manner is discarded without being reused because there is a possibility that dust or dirt may be mixed therein.

Other configurations of the coating booth 1 according to the second embodiment are the same as those of the coating booth 1 according to the first embodiment. Thus, in the coating booth 1 according to the second embodiment, basically, the same operation and effect as those of the coating booth 1 according to the first embodiment can be obtained.

(Embodiment 3) Hereinafter, Embodiment 3 of the present invention will be described with reference to FIG. However,
Most or basic parts of the coating booth 1 according to the third embodiment are common to the coating booth 1 according to the first or second embodiment shown in FIGS.
In order to avoid repetition of the description, only differences from the first or second embodiment will be described below. In addition, among the components of the coating booth 1 shown in FIG. 7, components common to the components of the coating booth 1 shown in FIGS. 1 to 6 are denoted by the same reference numerals.

As shown in FIG. 7, in the coating booth 1 according to the third embodiment, all the powders provided below the coating room 10, the first coating device room 11 and the second coating device room 12 are provided. The paint booth 1 according to the second embodiment has a paint collection mechanism.
It has the same configuration as the collecting mechanism provided below both coating equipment chambers 11 and 12 (see FIG. 6). Therefore,
In the coating booth 1 according to the third embodiment, the air containing excess powder coating in the coating chamber 10 is introduced into a cyclone (not shown) via the collection chamber 43 and the airflow duct 44. The powder paint in the air is collected by the cyclone.
The powder coating thus collected is collected and reused. Note that the powder paint collected by the powder paint collecting mechanism below the both coating equipment rooms 11 and 12 is discarded in the same manner as in the second embodiment.

Other configurations of the coating booth 1 according to the third embodiment are the same as those of the coating booth 1 according to the first or second embodiment. Thus, in the coating booth 1 according to the third embodiment, basically, the same operation and effect as those of the coating booth 1 according to the first or second embodiment can be obtained.

(Embodiment 4) Hereinafter, Embodiment 4 of the present invention will be described with reference to FIG. However,
Most or basic parts of the coating booth 1 according to the fourth embodiment are the same as those of the coating booth 1 according to the first embodiment shown in FIGS. 1 to 5. Only the points different from the first embodiment will be described. In addition, in each component of the coating booth 1 shown in FIG.
Components common to those of the coating booth 1 shown in FIGS. 1 to 5 are denoted by the same reference numerals.

As shown in FIG. 8, in the coating booth 1 according to the fourth embodiment, the first wall 6 and the second wall 7 as in the first embodiment are not provided. Only the coating room 10 'is provided on the floor, and no separate coating equipment room is provided.

The powder paint collecting mechanism of the coating booth 1 basically has a collecting chamber 26, a cartridge filter 27, an exhaust duct 28, a screw Feeder 29 and rotary valve 3
0, and a collection powder conveying pipe 31. Excess powder paint is collected by the same operation as in the first embodiment, and all of the powder paint is collected and reused. However, in the coating booth 1 according to the fourth embodiment, the size of each collection chamber 26 in the left-right direction is approximately twice as large as that in the first embodiment.

Other configurations of the coating booth 1 according to the fourth embodiment are the same as those of the coating booth 1 according to the first embodiment. Thus, the coating booth 1 according to the fourth embodiment can basically provide the same operation and effect as those of the coating booth 1 according to the first embodiment.

Embodiment 5 Hereinafter, Embodiment 5 of the present invention will be described with reference to FIG. However,
Most or basic parts of the coating booth 1 according to the fifth embodiment are common to the coating booth 1 according to the first embodiment shown in FIGS. 1 to 5 or the fourth embodiment shown in FIG. In order to avoid repetition, only the points different from the first or fourth embodiment will be described below. In addition, in each component of the coating booth 1 shown in FIG.
Components common to those of the coating booth 1 shown in FIGS. 1 to 5 or 8 are denoted by the same reference numerals.

As shown in FIG. 9, the painting booth 1 according to the fifth embodiment is different from the painting booth 1 according to the fourth embodiment.
As in the case of (see FIG. 8), the first wall 6 and the second wall 7 are not provided as in the case of the first embodiment, and only the coating room 10 ′ is provided on the second floor of the building 2. There is no separate coating equipment room.

In the painting booth 1, the painting room 1
Three collecting chambers 46 are provided below 0 '. These collecting chambers 46 are provided in the first or fourth embodiment.
The vertical dimension is smaller than that of the collection chamber 26, and most of it is constituted by a hopper-shaped (tapered) bottom.
Further, in the collection chamber 46, the cartridge filter 27 and the exhaust duct 28 that collect the powder paint as in the case of the first or fourth embodiment are not provided.

However, the lower end (valley bottom) of the bottom of each collecting chamber 46 communicates with the powder paint discharge duct 48 via the air discharge port 47. In addition, each collection room 46
In the lower part of the table, rectifying plates 50 for rectifying the flow of air or powder paint from the collection chamber 46 to the powder paint discharge duct 48 are provided. The distal end of the powder paint discharge duct 48 is connected to a cyclone (not shown) or a bag filter (not shown). Thus, painting room 1
The air containing excess powder paint in 0 ′ is introduced into a cyclone or a bag filter via a collection chamber 46, an air discharge port 47, and a powder paint discharge duct 48, and the air is removed by the cyclone or the bag filter. The powder paint inside is collected. The powder coating material thus collected is collected and reused.

Other configurations of the coating booth 1 according to the fifth embodiment are the same as those of the coating booth 1 according to the first or fourth embodiment. Thus, in the coating booth 1 according to the fifth embodiment, basically, the same operation and effect as those of the coating booth 1 according to the first or fourth embodiment can be obtained.

[Brief description of the drawings]

FIG. 1 is a front sectional view of a coating booth for an automobile according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of the painting booth shown in FIG.

FIG. 3 is an elevational sectional view of a first wall, a second wall, or a wall of a collection chamber of the coating booth shown in FIG. 1;

4 is a front sectional view of the painting booth shown in FIG. 1 in a state where a table lifter is introduced.

5 is a front sectional view of the painting booth shown in FIG. 1 in a state where a work gondola is introduced.

FIG. 6 is a front sectional view of a coating booth for an automobile according to a second embodiment of the present invention.

FIG. 7 is a front sectional view of a coating booth for an automobile according to a third embodiment of the present invention.

FIG. 8 is a front sectional view of a coating booth for an automobile according to a fourth embodiment of the present invention.

FIG. 9 is a front sectional view of a coating booth for an automobile according to a fifth embodiment of the present invention.

[Description of Signs] 1 ... Painting booth, 2 ... Building, 3 ... Main stage, 4 ...
Ceiling, 5 rectifying filter, 6 first wall, 7 second wall, 8 air supply room, 9 outside air introduction room, 10 coating room, 1 room
0 ': coating room, 11: first coating equipment room, 12: second coating equipment room, 13: forced air supply device, 14: maintenance stage, 15: maintenance stage, 16: booth illumination window, 17: maintenance stage, 18: maintenance stage, 19: booth lighting window, 20: conveyor, 21
... Transportation trolley, 22 ... Coated object (car body), 23 ...
Painting gun, 24 ... Grating, 25 ... Outside air supply device,
26: Collection chamber, 27: Cartridge filter, 28: Exhaust duct, 29: Screw feeder, 30: Rotary valve, 31: Collection powder conveying pipe, 32: Polyvinyl chloride plate, 33: Hollow part, 35: Work Dolly, 36 ... Elevating mechanism, 37 ... Table lifter, 38 ... Worker, 40 ... Work gondola, 43 ... Collection chamber, 44 ... Air flow duct, 46 ...
Collection chamber, 47 ... Air outlet, 48 ... Powder paint discharge duct, 50 ... Rectifier plate.

Claims (14)

[Claims] 1. A coating booth for an automobile for coating a body of an automobile, which is an object to be coated, with a powder paint, comprising: a coating room for coating the object to be coated; A coating booth for automobiles, comprising one or more collecting chambers arranged to collect excess powder paint, wherein a wall of the collecting chamber is formed of resin. 2. The coating booth for an automobile according to claim 1, wherein a wall portion of the coating room is formed of a resin. 3. The automotive coating booth according to claim 1, wherein the object to be coated is coated by electrostatic powder coating in the coating room. 4. The coating booth for an automobile according to claim 3, wherein the resin is polyvinyl chloride, and the inner surface of the resin wall is a smooth surface. 5. A coating booth for an automobile according to claim 4, wherein said wall portion is provided with an insulating means for suppressing movement of electric charges in said wall portion. 6. A coating booth for an automobile according to claim 5, wherein said insulating means is a hollow portion formed in said wall portion. 7. The automobile painting booth according to claim 5, wherein said insulating means is an insulating filler formed in said wall. 8. The coating booth for an automobile according to claim 6, further comprising an object transporting trolley for transporting the object to be coated in the coating booth. 9. A coating booth for an automobile according to claim 8, wherein a forced air supply device for forcibly supplying outside air into said coating chamber is provided at a ceiling portion of said coating chamber. 10. A work cart which is provided with elevating means capable of carrying an operator to ascend and descend, and which is capable of self-propelled in a coating booth.
A painting booth for an automobile as described in. 11. A collection device, wherein a bottom portion of the collection chamber is formed in a hopper shape narrowing downward, and a powder paint discharge port for discharging powder paint in the collection chamber is formed at a lower end portion of the bottom portion. The method according to claim 10, wherein a duct connected to the powder paint outlet and a collection device connected to the duct and collecting the powder paint are provided outside the collection chamber. An automotive painting booth as described. 12. The coating booth for an automobile according to claim 11, wherein the collection device is a cyclone. 13. The collecting chamber is formed in a hopper shape in which the bottom is narrowed downward, and the powder coating is collected, and the collected powder coating can be appropriately dropped to the bottom of the collecting chamber. The powder paint collection filter is provided, The powder paint discharge mechanism which discharges the powder paint which fell at the bottom of the above-mentioned collection room out of a collection room is provided, The claim 10 characterized by the above-mentioned. An automotive painting booth as described. 14. The powder paint discharging mechanism includes a screw feeder for collecting powder paint in the collection chamber, and a rotary valve for discharging the powder paint collected by the screw feeder out of the collection chamber. The automobile painting booth according to claim 13, wherein: