JPS6125657A - Wet coating boost - Google Patents

Abstract

PURPOSE:To increase the degree of removal for the paint mists contained in the discharged air and to diminish the pressure drop by providing a mesh filter for catching the coating mists which consists of the stainless fiber of multiplied layers to the inside and the outside of an exhaust dust so as to be circulated. CONSTITUTION:An exhaust apparatus 16 and a cleaning machine 34 are actuated simultaneously with the start of operation of a coating boost 1 and the cleaning liquid Ha incorporated in the bottom part of an exhaust chamber 4 is fed to an injection nozzle 37 with a pump 36 and blown toward the mesh filters. The paint uncoated on a car is changed into paint mists and passed through a drainboard 6 together with the air-conditioned air to be discharged to an exhaust chamber 4 and introduced into an exhaust duct 17. In this case, when the comparatively large paint mists are directly caught on the mesh filters 22 and built up in the specified quantity or more, these become glanules and fall to the bottom part of the exhaust chamber 4 but the parts incapable of removal by the cleaning liquid Ha are washed when these are transferred to a regenerating apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a wet painting booth in which paint mist scattered in a painting room is removed by a mesh filter disposed in an exhaust duct.

[Prior art]

Conventionally, in painting booths in which objects to be painted, such as automobile bodies, are continuously conveyed using a conveying device such as a conveyor and painted using an automatic painting machine such as a reciprocator or a painting robot, a wet painting method as shown in Fig. 3 is used. Booth is in use.

In FIG. 3, 51 is a paint booth formed in the shape of a tunnel, and the space inside this paint booth 51 is sequentially formed into three rooms: 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 divided by a filter 55 for removing fine dust, and the painting chamber 53 and the exhaust chamber 54 are divided by a screen 56 as a boundary.

A conveyor 57 is laid in the longitudinal direction on the upper surface of the bamboo basket 56, and rails 58.5 are provided on both sides of the conveyor 57.
8a has been installed. Further, automatic coating machines 59.59a such as reciprocators are arranged on both sides of the painting room 53, and each of these automatic metering machines 59.59a is equipped with a spray gun 60.60a. . Then, the automobile body W on the trolley 61 is coated with an automatic painting machine 59.59a.
When it was delivered to the place, the spray gun 60.6
The paint is sprayed by 0a to form a paint film.

Further, an air supply duct 62 is connected to the air supply chamber 52, and an air conditioner 63 is connected to the tip thereof, and an air supply fan 64 is provided downstream of the air conditioner 63.

Further, water supply devices 65.65a are horizontally disposed on both side walls 54a in the exhaust chamber 54 in the longitudinal direction, and inside the water supply devices 65.65a are flow plates 66.66a extending downward on opposite sides. is provided. In addition, the exhaust chamber 5
The bottom of 4 is a water storage tank 54b containing water H, and the side wall 54a thereof is connected to a supply gap 67 leading to a water supply machine 65.65a.
A pump 6B is provided for supplying water to 65a.

Further, an exhaust duct 69 is arranged outside the coating booth 51, and its lower end is connected to the side wall 54a of the exhaust chamber 54, and its upper end is open to the atmosphere. Further, an exhaust fan 70 is provided in the middle of the exhaust duct 69.

When painting an automobile body W, an air conditioner 63 supplies conditioned air adjusted to a predetermined temperature and humidity to an air supply chamber 52 by an air supply fan 64, and a pump 68 supplies water H to a water supply device 65. .65a to overflow onto flow plate 66.66a.

In addition, the conditioned air supplied to the air supply chamber 52 is filtered through a filter 55.
The paint mist that has not been applied to the automobile body W is passed through the screen 56 and discharged into the exhaust chamber 54, and the water flowing on the flow plate 66.66a is During contact, paint mist is removed from the exhaust air. The exhaust air from which the paint mist has been removed is discharged into an exhaust duct 69 by an exhaust fan 70, and is then discharged to the outside.

However, in such a wet painting booth, the exhaust air that has passed through the screen 56 from the painting room 53 and is exhausted to the exhaust chamber 54 is transferred to the flow plate 66.66M.
Since the paint mist is captured while being brought into contact with the flowing water H with low viscosity, the removal rate of paint mist with small particle size is poor, and when capturing the paint mist, the tip of the flow plate 66.66a Since the air is removed by vigorous contact with water H, there is a problem in that the pressure loss of the conditioned air supplied to the painting room 53 becomes large.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a mesh filter for capturing paint mist made of multi-layered stainless steel fibers so as to circulate inside and outside the exhaust duct. An object of the present invention is to provide a wet painting booth that can increase the removal rate of paint mist contained in the paint and reduce pressure loss.

(Structure of the Invention) In order to achieve the above object, the structure of the wet coating booth according to the present invention is such that the space inside the booth is divided into an air supply chamber and an f1i storage chamber from above, with the filter and the screen as boundaries, respectively. and an air supply duct that is formed in the royal part of the exhaust chamber and supplies conditioned air to the air supply chamber, and an exhaust duct that discharges exhaust air from the painting room is connected to the exhaust chamber, and the exhaust duct is connected to the exhaust chamber. A wire mesh belt that circulates in and out of the exhaust duct in the horizontal direction is provided, and a mesh filter made of stainless steel fibers for capturing paint mist is also integrally provided with this wire mesh belt. A cleaning machine that sprays cleaning liquid toward the mesh filter is installed above.

[Action of the invention]

In such a wet painting booth, when painting the object to be painted, conditioned air, which is adjusted to a predetermined temperature and humidity by an air conditioner, is uniformly supplied from the air supply chamber through a filter to the painting room, and the object to be painted is coated. It is sequentially discharged into the exhaust chamber and exhaust duct together with the paint mist that is scattered in the painting room without being applied to the paint.

Then, the exhaust air containing paint mist discharged into the exhaust duct passes through a mesh filter for capturing paint mist disposed in the exhaust duct. At this time, relatively large paint mist is directly captured by the mesh filter, and small paint mist that is not directly captured by the mesh filter is captured by the cleaning liquid sprayed from the cleaning machine and falls to the bottom of the exhaust chamber.

In addition, when relatively large paint mist captured by the mesh filter accumulates on the mesh filter beyond a certain level, it becomes granular due to the synergistic effect of the surface tension of the paint mist and the stainless steel fibers that make up the mesh filter, and is removed from the mesh filter. It peels off and falls to the bottom of the exhaust chamber 4. At that time, some paint mist remains on the mesh filter,
The cleaning liquid sprayed from the cleaning machine reduces the viscosity and cleans it, and it falls to the bottom of the exhaust chamber.

(Example) Hereinafter, one example of the present invention will be described in detail based on the drawings.

Figure 1 shows the wet type according to the present invention! i! FIG. 2 is a cross-sectional view of the IVT booth viewed from the front, and FIG. 2 is a plan cross-sectional view taken along line nn in FIG. 1.

1 and 2, numeral 1 denotes a tunnel-shaped paint booth, and the space inside this paint booth 1 consists of an air supply chamber 2, a painting chamber 3, and an exhaust chamber 4 from above. The air supply chamber 2 and the painting chamber 3 are separated by a filter 5 for removing fine dust, and the painting chamber 3 and the exhaust chamber 4 are separated by a screen 6.

Both ends of the painting chamber 3 in the longitudinal direction are open,
Both longitudinal ends and both sides of the air supply chamber 2 and the exhaust chamber 4 are closed.

An air supply duct 7 is connected to the air supply chamber 2,
An air supply fan 8 is installed in the middle, and
An air conditioner 9 is connected to the tip. Further, a conveyor 10 is installed on the upper surface of the screen 6 in the longitudinal direction of the central part of the painting room 3, and this conveyor 10
0 is provided with a plurality of dogs 12 that are hooked to a trolley 11 on which an automobile body W, which is an object to be painted, is placed and transported.

Further, rails 13.13a are laid on both sides of the conveyor 10, and the trolley 11 is guided by these rails 13.13a.

Furthermore, an automatic painting station 114.14a such as a reciprocator is installed on the sides of both rails 13.13a.
This automatic coating machine 14.14a is provided with a spray gun 15.15a that moves vertically and horizontally and sprays paint toward the automobile body W.

Further, an exhaust device 16 is provided outside the exhaust chamber 4, and is formed as follows. That is, the exhaust chamber 4
An exhaust duct 17 is erected on the outside of the exhaust duct 17, the upper end of which is connected to the front of the air conditioner 9 connected to the air supply duct 7, and the lower end connected to the bottom of the exhaust chamber 4. ing. An exhaust fan 18 is provided in the middle of this exhaust duct 17.

Further, a wire mesh belt 19 is disposed below the exhaust fan 18 of the exhaust duct 17, and the wire mesh belt 19 is provided widely across the width direction of the exhaust duct 17. It is arranged in a fixed position horizontally from the inlet 20 side, and is formed in an endless shape so that it once exits to the outside of the exhaust duct 17 from the outlet 21 side, and then moves back into the inside from the outlet 21 side of the exhaust duct 7. .

Further, on the surface of the wire mesh bell 1-19, this wire mesh belt 1
A mesh filter 22 for capturing paint mist is provided throughout the width direction and length direction so as to be integrated with the mesh filter 9 . This mesh filter 22 is 0.05 mm to 0.0 mm in order to efficiently capture paint mist.
2 B stainless steel fibers are woven into a rope shape, and 10 to 100 sheets are stacked to form a belt shape, and the thickness is 25 to 50 mm. The pressure loss is said to be in the range of 5 to 10 mAq. Thereby, the exhaust air containing paint mist discharged from the painting chamber 3 is allowed to pass through, and the paint mist contained in the exhaust air is captured.

In addition, a wire mesh belt 1 is provided on the entrance 20 side of the exhaust duct 17.
A regenerating device 23 for cleaning and removing paint mist captured by the mesh filter 22 is disposed on the movement path of the mesh filter 9 and the mesh filter 22. The regenerating device 23 is disposed so as to cover the bent portions of the wire mesh belt 19 and the mesh filter 22, and includes a storage tank 24 containing water H and water H that has been cleaned of paint mist from the mesh filter 22; A circulation pipe 25 connected near the bottom of the storage tank 24 and disposed between the wire mesh belts 19 whose other end circulates;
A wire mesh belt 19 is provided at the tip of this circulation pipe 25.
and a nozzle 26 that spouts water H toward the mesh filter 22; a pump 27 that is installed in the middle of the circulation pipe 25 and supplies the water H to the nozzle 26; and a pump 27 that is installed in the storage tank 24 and supplies the water H to the storage tank 24 and a supply pipe 28 for supplying the same. Then, the regenerator 23 directs the nozzle 26 toward the moving wire mesh belt 19 and the mesh filter 22.
By injecting water H from the mesh filter 2
The paint mist caught in the 2nd part is cleaned and removed and regenerated.

In addition, a wire mesh heald 19 is provided on the exit 21 side of the exhaust duct 17.
A drive device 29 for circulating the mesh filter 22 in and out of the exhaust duct 17 is provided. This drive device 2
9 is a motor 30 provided on the floor and an exhaust duct 17
The wire mesh belt 19 is provided on the outlet 21 side and the inlet 20 side of the
and a rotating body 32.3 supporting the mesh filter 22.
3, and a belt 31 stretched between a rotating body 32 on the outlet 21 side and a motor 3o. As the motor 3o of the drive device 29 rotates, the wire mesh belt 19 and the mesh filter 22 circulate inside and outside the exhaust duct 17.

Further, above the mesh filter 22, there is a cleaning 4 which sprays cleaning liquid Ha toward the mesh filter 22.
1134 are arranged. This washer 34 has one end opened near the bottom of the exhaust duct 17 and the other end opened near the bottom of the exhaust duct 1.
A supply pipe 35 that opens at the top of the mesh filter 22 of No. 7
and a pump 36 installed in the middle of this supply pipe 35.
and a mesh filter 2 provided at the tip of the supply pipe 35.
It consists of a plurality of injection nozzles 37 that spray the cleaning liquid Ha toward the cleaning liquid Ha.

The cleaning liquid Ha is adjusted by adjusting the mixing ratio of water, killer agent, etc., and normally has a pH of 7 to 9.
is managed by. Then, the cleaning liquid Ha is supplied from the bottom of the exhaust chamber 4 to the injection nozzle 37 by the pump 36, and the cleaning liquid A is sprayed toward the mesh filter 22 to remove the paint mist captured by the mesh filter 22 and discharge it. It is designed to clean and remove paint mist from the air.

The operation of the wet coating booth configured as described above will be explained.

Simultaneously with the start of operation of the coating booth 1, the air supply fan 8, air conditioner 9, and exhaust fan 18 are activated. 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 17, and the circulation path of the air conditioner 9.

The outside air introduced into the air conditioner 9 is cleaned of dust, adjusted to a predetermined temperature and humidity, and then supplied to the air supply chamber 2, passing through the filter 5 and evenly distributed to the painting room 3. Supplied.

Further, the automobile body W on the trolley 11 that has been transported by the conveyor 10 is transported into the painting room 3 from the entrance thereof. Then, when the automobile body W is transported to the automatic coating machines 14.14a arranged on both sides of the painting room 3, paint is sprayed by the spray guns 15.15a to form a coating film. . In this manner, the automobile body W is sprayed with paint while being conveyed by the conveyor 10 to complete the painting process, and is then conveyed from the exit of the painting chamber 3 to the next process.

On the other hand, at the same time as the paint booth 1 starts operating, the exhaust device 16 and the cleaning machine 34 are in operation, and the cleaning liquid Ha stored in the bottom of the exhaust chamber 4 is pumped by the pump 36 to the injection nozzle 3.
At the same time, the cleaning liquid Ha is supplied to the injection nozzle 3.
The air is blown toward the mesh filter 22 at a pressure of 7 to 2-/- to 10 kg/ad.

Further, the paint that has not been applied to the automobile body W becomes a paint mist and is discharged into the exhaust chamber 4 through the bamboo basket 6 together with the conditioned air supplied to the painting room 3, and is led to the exhaust duct 17. The exhaust air containing paint mist led into the exhaust duct 17 passes through the mesh filter 22 which is wetted with the cleaning liquid Ha sprayed by the cleaning machine 34 .

When the exhaust air containing paint mist passes through the mesh filter 22, relatively large paint mist is directly captured by the mesh filter 22, and small paint mist that is not directly captured by the mesh filter 22 is emitted from the injection nozzle 37. The sprayed cleaning liquid) is captured by (a) and falls to the bottom of the exhaust chamber 4.In addition, the relatively large paint mist captured by the mesh filter 22 is Due to the synergistic effect of the surface tension and the stainless steel fibers constituting the mesh filter 22, the paint mist becomes particles, peels off from the mesh filter 22, and falls to the bottom of the exhaust chamber 4. At this time, some of the paint mist is transferred to the mesh filter 22.
However, the viscosity is reduced by the cleaning liquid Ha sprayed from the cleaning 4M [ 34 and the cleaning liquid Ha is removed from the mesh filter 22 and dropped to the bottom of the exhaust chamber 4 and stored therein.

Then, the exhaust air from which the paint mist has been removed is discharged to the outside from the exhaust duct 17 by the exhaust fan 18.

Further, the mesh filter 22 is driven by the drive device 29 together with the wire mesh belt 19 from the inside of the exhaust duct 17 to the outside and transferred to the recirculation device 23, and is moved to the recirculation device 23 by the pump 27 within the range of 40° C. to 90° C. in the storage tank 24. The water H adjusted to 2 kg/cd or 1 from the nozzle 26
Injected at a pressure of 0 kg/ad. At that time, the viscosity of the paint mist that entered the mesh filter 22 and could not be completely removed by the cleaning liquid Ha is reduced, and due to the synergistic effect of the surface tension of the paint mist and the stainless steel fibers that make up the mesh filter 22. , are washed and removed from the mesh filter 22, and fall into the storage tank 24 together with the water H to be stored therein.

Then, the mesh filter 22 whose paint mist trapping performance has been restored is moved into the exhaust duct 17 again, and the exhaust cleaning process of the conditioned air discharged from the painting room 3 is carried out while the painting booth 1 is in operation. It is done repeatedly.

〔Effect of the invention〕

As explained above, in the wet painting booth according to the present invention, a mesh filter made of stainless steel fibers for capturing paint mist is provided to circulate inside and outside the exhaust duct, and a cleaning liquid is sprayed above the mesh filter. Because the cleaning machine is installed, the cleaning liquid and the paint mist contained in the discharged air come into contact through the mesh filter, increasing the contact rate between the two and achieving a high removal rate even for paint mist with small particle sizes. There is an effect that can be obtained.

Furthermore, in the present invention, a mesh filter for capturing paint mist that circulates inside and outside of the exhaust duct is provided in the horizontal direction of the exhaust duct, so the pressure loss of the conditioned air supplied to the painting room can be reduced. effective.

Further, in the present invention, since the removal rate of paint mist is high, the air discharged to the outside from the exhaust duct is highly purified, and there is an effect that an adverse effect on the surrounding environment can be avoided.

Furthermore, in the present invention, since the mesh filter for capturing paint mist is formed of stainless steel fibers, the paint mist captured by the mesh filter is naturally converted to 1AiIl by the synergistic effect of the surface tension of the paint mist and the stainless steel fibers. Therefore, a constant cleaning effect can be obtained at all times.

Furthermore, the present invention has the effect of reducing the power cost for operating an air conditioner and the like by reducing the pressure loss of conditioned air.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a wet coating booth according to the present invention, viewed from the front. FIG. 2 is a sectional view taken along line nn in FIG. 1. FIG. 3 is a sectional view of a conventional wet painting booth viewed from the front. 1 - Painting booth 2 - Air supply chamber 3 - Painting room 4 - Exhaust chamber 5 - Filter 6 -・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・Air supply duct 8・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・One trolley 12---Dog 13.13a---Rail 14.14a---Automatic painting machine 15.15a---Spray gun 16---One--- Exhaust device 17---Exhaust duct 18---Exhaust fan 19---Wire mesh belt 20---Population 21---Exit 22---Filter 23...Regeneration device 24--111 storage tank 25--Circulation vibe 26--Nozzle 27--Pump 28--・・Supply pipe 29・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・。・Cleaning machine 35...-Supply pipe 36...--Pump 37...--Injection nozzle

Claims (1)

[Claims] The space inside the booth is formed into three rooms, an air supply room, a painting room, and an exhaust room, sequentially from above, with the filter and the screen as boundaries, respectively, and an air supply duct is connected to supply conditioned air to the air supply room. , an exhaust duct for discharging exhaust air from the painting room is connected to the exhaust chamber, and a wire mesh belt that circulates inside and outside of the exhaust duct is installed in the horizontal direction of the exhaust duct, and stainless steel fiber is attached to the wire mesh belt. What is claimed is: 1. A wet-type painting booth characterized in that a mesh filter for capturing paint mist is integrally disposed, and a cleaning machine for spraying a cleaning liquid toward the mesh filter is further disposed above the mesh filter.