JPS60175570A - Removal of paint mist of exhaust gas recirculation type painting booth - Google Patents

Abstract

PURPOSE:To prevent the clogging of a filter, by a method wherein the paint mist in a booth is brought into contact with a wet filter apparatus along with air conditioning air and, thereafter, the air-conditioning air is passed through the filter of a regenerable filter apparatus. CONSTITUTION:Paint mist in a painting booth is brought into contact with recirculation water H of a wet filter apparatus 2 along with air conditioning air supplied to said painting booth to preform the primary removal of said paint mist and air conditioning air after primary removal is further continuously passed through the filter 38 of the regenerable filter apparatus 27 to perform secondary removal. By this method, the generation of painting inferiority such as color mixing or blistering is prevented and the replacement frequency of the filter is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for removing paint mist from an exhaust circulation type paint booth.

[Prior art]

BACKGROUND ART Conventionally, for example, when painting an automobile body while being continuously conveyed by a conveyor or the like, an exhaust circulation type paint booth as shown in FIG. 6 has been widely used.

In FIG. 6, 51 is a paint booth formed in the shape of a tunnel, and the space inside this paint booth 51 is formed in order from above into an air supply chamber 52, a painting chamber 53, and an exhaust chamber 54. The air supply chamber 52 and the painting chamber 53 are separated by a filter 55 that removes fine dust, paint mist, etc., and the painting chamber 53 and the exhaust chamber 54 are divided by the
It is divided with 6 as the boundary.

A circulation duct 57 is arranged outside the painting booth 51, one end of which is connected to the exhaust chamber 54, and the other end connected to the air supply chamber 52. Also,
A circulation fan 58 is provided on the air supply chamber 52 side of this circulation duct 57.
is provided, and an air conditioner 59 is provided upstream thereof.

Additionally, water supply gutters 60a and 60tr are arranged horizontally in the longitudinal direction on both side walls 54a in the exhaust chamber 54, and inside thereof flow plates 61a and 61b extend downward on opposite sides. The structure is set up.

When painting an automobile body W, the air in the painting booth 51 is adjusted to a predetermined temperature and humidity by an air conditioner 59, and is supplied to the air supply chamber 52 by a circulation fan 58, and is passed through a filter 55 for painting. The chamber 53 is continuously supplied. Then, the paint mist that has not been applied to the automobile body W is passed through the screen 56 and placed in the exhaust chamber 54.
At the same time, the water supply machines 60a and 60 of the exhaust chamber 54
Overflow from b to flow plate 61a.

Paint mist is removed from the air while being brought into contact with the circulating water H flowing above 61b. Then, the air from which the paint mist has been removed is exhausted to the circulation duct 57, and the air conditioner 5
At step 9, the temperature and humidity are adjusted to predetermined values, and the air is circulated through the circulation path.

However, in such an exhaust circulation type painting booth, the air inside the painting booth is supplied to the air supply chamber 52, the painting room 53,
Since the paint is continuously circulated through the circulation path of the exhaust chamber 54 and the circulation duct 57, as the number of automobile bodies W to be painted increases, the amount of fine paint mist in the air circulating inside the painting booth 51 increases. do. For this reason, the paint mist in the circulating air is caused by the filter (not shown) provided in the air conditioner 59, the air supply chamber 52, and the painting chamber 5.
The transmission hole of the filter 55 disposed at the boundary with the paint chamber 53 is blocked, causing turbulence in the air flow within the painting chamber 53, and causing color mixing, bumps, etc. due to paint mist or dust scattered during painting. In addition to the occurrence of painting defects, there is also the problem that the filter of the air conditioner 59 and the filter 55 disposed at the boundary between the air supply chamber 52 and the painting chamber 53 must be replaced at an early stage.

[Purpose of the invention]

The present invention was made to solve the above-mentioned problems, and its purpose is to first remove paint mist in the air circulating in a paint booth using circulating water, and then to use a continuously regenerated filter to remove the paint mist in the air. By removing the following, color mixing,
An object of the present invention is to provide a method for removing paint mist from an exhaust circulation type painting booth, which can prevent paint defects such as bumps and reduce the frequency of filter replacement.

[Structure of the invention]

In order to achieve the above object, the paint mist removal method for an exhaust circulation type paint booth according to the present invention is provided in a painting room of an exhaust circulation type paint booth in which conditioned air supplied to the paint booth is circulated. In order to remove the paint mist that scatters without adhering to the object to be painted in the circulation path of the conditioned air, the paint mist is brought into contact with the circulating water of the wet filtration device together with the conditioned air supplied to the painting booth, and further, −
The conditioned air after the secondary removal is passed through a filter of a filtration device that can be continuously regenerated to perform secondary removal.

[Action of the invention]

In this method for removing paint mist from an exhaust circulation type paint booth, when painting an object to be painted, conditioned air adjusted to a predetermined temperature and humidity is evenly supplied to the painting room, and the painting can be done without adhering to the object to be painted. The paint mist scattered in the room comes into contact with the circulating water of the wet filtration device along with the conditioned air. At this time, most of the paint mist contained in the conditioned air is primarily removed by the circulating water. The removed conditioned air contains fine paint mist that could not be completely removed by the circulating water, but is passed through the next removal means, a filter of a continuously reproducible filtration device. At this time, fine paint mist that could not be removed by the circulating water is secondarily removed from the conditioned air and purified. The purified conditioned air is then adjusted to a predetermined temperature and humidity and supplied into the painting booth.・As a result, there is no paint mist in the conditioned air that is circulated inside the painting booth, and the filter installed at the boundary between the air supply room and the painting room of the painting booth and the transmission holes of the air conditioner filter Blockage is prevented.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings.

Fig. 1 is a cutaway front view of an exhaust circulation type paint booth used in the paint mist removal method of the present invention, Fig. 2 is a side view cut along line nn in Fig. 1, and Fig. 3 is A sectional view of an air conditioner used in the paint mist removal method of the present invention, FIG. 4 is a sectional view taken along line IV7rV in FIG. 3, and FIG. 5 is a sectional view taken along line V-V in FIG. 3. It is a diagram.

[Configuration of Example]

1 and 2, reference numeral 1 denotes a paint booth formed in the shape of a tunnel, and the space of this paint booth l is arranged in order from above into an air supply chamber 2, a painting chamber 3, and an exhaust chamber 4. The air supply chamber 2 and the painting chamber 3 are separated by a filter 5 for removing fine dust and paint mist, and the painting chamber 3 and the exhaust chamber 4 are separated by a screen 6. ing. The coating chamber 3 is open at both longitudinal ends, and the air supply chamber 2 and exhaust chamber 4 are closed.

Further, an air supply duct 7 is connected to the air supply chamber 2, and an air supply fan 8 and an air conditioner 9 are successively connected to the air supply duct 7. Furthermore, a conveyor 1 is placed on the top surface of the screen 6 of the painting room 3 in the longitudinal direction of the central part of the painting room 3.
In addition, the conveyor 10 is provided with a plurality of dogs 12 that are hooked onto a trolley 11 on which an automobile body W, which is an object to be painted, is placed and transported.

Furthermore, rails 13a and 13b having a U-shaped cross section are laid on both sides of the conveyor 10, and the cart 11 is guided by these rails 1'3a and 13b. Also, on the sides of both rails 13a and 13b, a reciprocator, an automatic painting machine 14a such as a painting robot, etc.
, 14b are provided, and these automatic coating machines 14a, 1
4b includes a spray gun 15a that moves in the vertical and horizontal directions and sprays the paint T toward the automobile body W;
15b is provided.

Further, a water supply device 16a having a U-shaped cross section along the longitudinal direction of the exhaust chamber 4 is provided on the volume side wall 1a inside the exhaust chamber 4.
, 16b are provided horizontally, and inside thereof there are flow plays (17) which are inclined downward on opposite sides.
a and 17b are provided. In addition, water supply machines 16a, 1
One end of a water supply pipe 18 is connected to 6b, and the other end of this water supply pipe 18 is connected to the vicinity of the bottom 4a of the exhaust chamber 4, and a pump 19 is provided in the middle thereof. This results in
It constitutes a wet filtration device. When painting the automobile body W, a water supply device 16 is supplied from the bottom 4a by the pump 19.
The circulating water I] supplied to a and 16b overflows and flows over the flow plates 17a and 17b to form a water film,
Dust, paint mist, etc. are captured while being brought into contact with the exhaust air containing paint mist exhausted from the painting chamber 3.

Further, an exhaust duct 1 - 20 is connected to the side wall la of the exhaust chamber 4 , and one end of the exhaust duct 1 - 20 is connected to a gear gallery 21 of the air conditioner 9 provided in the air supply duct 7 . Further, an exhaust fan 22 is provided in the middle of the exhaust duct 20, and an exhaust duct 23 is provided above the exhaust fan 22.
are arranged in series, and a damper 24 for opening and closing the passage of the discharge duct 23 is provided in the middle thereof. Most of the exhaust air exhausted from the exhaust chamber 4 is supplied to the gear gallery 21 of the air conditioner 9 by the exhaust fan 22, and the rest is discharged to the outside from the exhaust duct 23.

Moreover, the air conditioner 9 connected to the air supply duct 7 is
It is formed as shown in FIGS. 3 to 5. That is, one side of the container 25 of the air conditioner 9 is connected to the air supply duct 7 in which the air supply fan 8 is provided, the other side is provided with the gear rally 21, and the discharge duct 20 is provided below.
are installed in succession.

Inside the container 25, there is a continuously regenerating device that removes dust from the outside air introduced into the container 25 and fine paint mist from the discharged air from the gear gallery 21 toward the downstream side of the air supply fan 8. A filtration device 27, an eliminator 28 for removing water droplets contained in the introduced air, a roll filter 29 for removing paint mist re-splattered from the filtration device 27, and a cooling system for cooling the air introduced into the container 25 in summer. A refrigerator 30 and a heater 31 that heats the outside air introduced into the container 25 with steam to adjust the relative humidity are arranged in this order.

As shown in FIG. 4, the above-mentioned filtration device 27 has a capture area A that removes paint mist in the exhaust air introduced from the exhaust duct 20 and dust from the outside air introduced from the gear gallery 21, and It consists of a regeneration area B that separates paint mist and dust, and both areas A and B are partitioned by a wall board 32.

In addition, an endless wire mesh belt 33 is disposed in the capture area A and the regeneration area B and circulates in the lateral direction of both areas A and B, and this wire mesh belt 33 is attached to support members on both sides of the capture area A. 3
It is supported by six rotating rollers 35 provided in 4a and 34b, one rotating roller 36 provided in the regeneration area B, and a driving roller 37, and is driven by the driving roller 37 to circulate within the container 25. It has become. A mensch filter 38, which is formed by weaving thin metal wires such as stainless steel with 1lii4 erodibility, is integrally disposed on the surface of the wire mesh belt 33, and is used to remove paint mist contained in the discharged air. and dust contained in the outside air are captured.

In addition, five shielding plates 39 are provided on the upstream and downstream sides of the wire mesh belt 33 in the trapping area A, and block the exhaust air and outside air introduced into the trapping area A to pass through the mesh filter 38. It is designed to guide you. In the upper part of the trapping area A, there is a sprayer 40 that sprays water H onto the mesh filter 38.
The sprayer 40 includes a water tank 41 containing water H, and a plurality of nozzles 42 provided at the bottom of the water tank 41.

Further, a storage tank 43 is provided at the bottom of the capture area A to store water H sprayed from the sprayer 40 to wash the mensch filter 38 and the wire mesh belt 33.
3 is connected to a supply pipe 44 whose one end is connected to a water storage tank 41, and a pump 45 is provided in the middle of the supply pipe 44.

Further, a motor 46 for rotating the drive roller 37 is provided in the reproduction area B, and the motor 46 and the drive roller 3
A belt 47 is stretched between the belt 7 and the belt 7. Further, a storage tank 48 for storing water H is provided in the lower part of the regeneration area B. One end of a supply pipe 50 provided with a pump 49 is connected to this storage tank 48, and the other end is connected to a wire mesh belt 33.
is located inside. A plurality of nozzles 51 are provided at the tip of this supply pipe 50, and the pump 4
9, high-pressure water H is injected from the nozzle 51 toward the wire mesh belt 33 and the mesh filter 38, and the paint mist in the exhaust air and the dust in the outside air captured by the mesh filter 38 are washed away. It is set to be played.

In addition, 2G is the humbal of the roll filter 29.

[Effect of the embodiment]

A method for removing paint mist in the exhaust circulation type paint booth configured as described above will be explained.

That is, the air supply fan 8, air conditioner 9, and exhaust fan 22 are activated at the same time as the paint booth 1 starts operating. As the air supply fan 8 operates, outside air is introduced into the air conditioner 9, and the air is circulated through the air supply chamber 2, the painting chamber 3, the exhaust chamber 4, the exhaust duct 20, and the circulation path of the air conditioner 9. At the same time, the pump 19 is activated, and the circulating water H is overflowed from the water supply gutters 16a and 16b of the exhaust chamber 4 and flows down to the flow plays 17a and 17b, forming a water film. The outside air and circulating air introduced into the air conditioner 9 are cleaned of dust, adjusted to a predetermined temperature and humidity, and then supplied to the air supply chamber 2, passed through a filter 5, and distributed evenly into the painting chamber 3. supplied to

Further, the automobile body W on the trolley II, which has been conveyed by the conveyor 10, is conveyed into the painting room 30 from the entrance 3a. When the automobile body W is transported near the automatic painting stations a14a and 14b arranged on both sides of the painting room 3, the paint T is sprayed by the spray guns 15a and 15b of the automatic painting stations a14a and 14b. A paint film is formed. In this manner, the automobile body W is sprayed with the paint T while being conveyed by the conveyor lO, and the coating is completed, and the automobile body W is conveyed from the outlet 3b of the painting chamber 3 to the next process.

Furthermore, the paint mist that scatters when painting the automobile body W passes through the air supply chamber 2, passes through the filter 5, and is evenly supplied to the painting chamber 3 together with the conditioned air, which passes through the screen 6 and is exhausted to the exhaust chamber 4. be done. The exhaust air containing the paint mist exhausted into the exhaust chamber 4 is circulated through the water film that overflows from the water supply gutters 16a and 16b and flows down on the flow plates 17a and 17b, and at the tips of the flow plates 17a and 17b. Vigorous contact with water H primarily removes most of the dust, paint mist, etc. from the discharged air.

Then, the exhaust air from which most of the dust, paint mist, etc. have been removed is transferred to the exhaust duct 2 by the exhaust fan 22.
Most of the exhaust air is supplied to the gearbox 21 of the air conditioner 9, and the remaining exhaust air is discharged to the outside from the exhaust duct 23. It is introduced into the container 9.

Also, at the same time as the air supply fan 8 is activated, the pump 45.49
is in operation, and the nozzle 42 in the capture area A and the regeneration area B
from the nozzle 51 to the wire mesh belt 33 and mesh filter 3
Water H is being sprayed and sprayed onto 8. Then, the exhaust air supplied from the exhaust duct 20 to the gear rally 21 and the outside air introduced from the gear rally 21 are mixed with the wire mesh belt 33 and the mensch filter 38 which are wetted by the water H.
pass through. At this time, the fine paint mist that could not be removed by the circulating water H in the exhaust chamber 4 is secondarily removed from the exhaust air, and the dust in the outside air is also removed and cleaned.

Then, the water droplets contained in the cleaned air when it passes through the mesh filter 38 are removed by the elinator 28, and the fine paint mist re-splattered by the filtration device 27 is removed by the roll filter 29. And freezer 3
0 and the heater 31, it becomes conditioned air that is adjusted to a predetermined temperature and humidity and is supplied to the air supply chamber 21.

In addition, in the filtration device 27, a wire mesh belt 33 and a mesh filter 38 are driven by a drive roller 37, and paint mist and dust captured by the mesh filter 38 are removed by water H sprayed from a nozzle 42 of a sprayer 40. As a result, most of the pieces are removed and dropped into the storage tank 43. The conditions at that time are that the passing wind speed is 1 to 3 m/s
ec, the amount of water sprayed from the water storage tank 41 onto the mensch filter 38 is 0.01 to 0.1 per amount of air passing through 1
, the pressure loss is in the range of 2 to 10 Aq.

Further, the paint mist and dust remaining on the mensch filter 38 are removed by the high pressure water 1 (injected from the nozzle 51 in the regeneration area B) from the wire mesh belt 33 and the mensch filter 38.
The mensch filter 38 is regenerated by being sprayed and washed. At that time, the pressure of the filtered water H injected toward the wire mesh belt 33 and the mensch filter 38 is 3 to 50.
It is carried out in the range of kg / ca.

Then, the regenerated mesh filter 3B is circulated to the capture area A again together with the wire mesh belt 3.

Moreover, the water H in the storage tank 43.4B is periodically exchanged and cleaned.

〔Effect of the invention〕

As explained above, in the method for removing paint mist from an exhaust circulation type paint booth according to the present invention, paint mist in the air circulating inside the paint booth is removed from the circulating water of the wet filtration device together with the conditioned air supplied into the painting room. The paint mist and dust contained in the exhaust air are removed first by being brought into contact with the air, and then the conditioned air is passed through the filter of a continuously recyclable filtration device for secondary removal. This has the effect of suppressing clogging of the filter and greatly extending its life.

Furthermore, in the present invention, by suppressing clogging of the filter, turbulence in the conditioned air supplied to the painting room is prevented, and paint mist scattered in the painting room can be quickly exhausted. This has the effect of preventing paint defects such as color mixing and bumps caused by mist.

Further, in the present invention, by suppressing clogging of the filter, there is an effect that replacement frequency and replacement cost can be significantly reduced compared to filters of conventional exhaust circulation type painting booths.

[Brief explanation of the drawing]

FIG. 1 is a cutaway front view of an exhaust circulation type paint booth used in the paint mist removal method of the present invention. FIG. 2 is a side view taken along line nn in FIG. 1. FIG. 3 is a sectional view of an air conditioner used in the paint mist removal method of the present invention. FIG. 4 is a sectional view taken along the line IV--IV in FIG. 3. FIG. 5 is a sectional view taken along line V-V in FIG. 3. FIG. 6 is a cutaway front view of a conventional exhaust circulation type painting booth. 1'-----Painting booth 2・--・・・Air supply chamber 3---------1 Painting room 4・-11111 Exhaust chamber 5--・・・・-Filter 6 ...−1−−−The child of the bamboo shoot? -------・Air supply duct 8-----1・・Air supply fan 9・・・-・・Air conditioner 16 a, 16 b-----1 Water supply gutter 17 a
, 17 b---Flow play 118...-
...-Water supply pipe 19.--11--Pump 20.....-Exhaust duct 22--Exhaust fan 25.--1--Container 27.....Filtration device 33.--Wire mesh belts 34a, 34b--Supporting members 35.36-.
--- Single rotation roller 37 --- Drive roller 38 --- Mesh filter 39 --- Shielding plate 40 --- Sprayer 41 --- Water storage Tank 41.51 --- Nozzle 42.48 --- Storage tank 44.50 --- Supply pipe 45.49 --- Pump 46 --- -Motor 47--Belt A...--Capture area B--Regeneration area 1st wA Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] In the painting room of an exhaust circulation type painting booth where the conditioned air supplied into the painting booth is circulated, the above-mentioned method is used to remove paint mist that scatters without adhering to the object to be painted in the circulation path of the conditioned air. The conditioned air supplied to the painting booth is brought into contact with the circulating water of the wet filtration device for primary removal, and the conditioned air after the secondary removal is passed through the filter of the filtration device that can be continuously regenerated for secondary removal. A method for removing paint mist from an exhaust circulation type paint booth.