JPS60114326A - Method and device for treating waste air from painting booth - Google Patents

Abstract

PURPOSE:To capture efficiently only the waste air having a high concn. of hydrocarbon and to decrease the wind flow rate for a deodorization treatment by deodorizing the waste air in the part where the concn. of hydrocarbon is high out of the local hoods disposed along the conveying line of a painting booth and treating the waste air from the part where said concn. is low with an outdoor treating device for the waste air. CONSTITUTION:The concns. of hydrocarbon in the respective zones in a local booth 20 of a painting booth 1 are measured with measuring instruments 23. The concn. of hydrocarbon is high in the zone where painting is accomplished and therefore the waste air therefrom is conducted into the 1st branch duct 24 by opening an open/shut damper 28 and is introduced through a main duct 27 into a deodorizing device 26 by which the waste air is deodorized. The deodorized air is discharged to the outside. The concn. of hydrocarbon is low in the zone where painting is not accomplished and therefore the waste air after subjected to removal of paint mists by a filter 22 is introduced via the 2nd duct 25 and a discharge duct by the damper 28 into an outdoor treating device 18 for the waste air by which the waste air is treated. The treated air is discharged to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION C. Industrial Application Field The present invention relates to a method and apparatus for treating exhaust air locally discharged from a painting room of a painting booth.

[Prior art]

Conventionally, for example, when painting urethane bumpers attached to the front and rear of a car while being continuously transported by a conveyor or other conveyance device, a painting booth like the one shown in Figure 4 has been used. has been done.

In FIG. 4, reference numeral 51 denotes a painting booth formed in the shape of a tunnel, and the space inside this painting booth 51 is formed in order into an air supply chamber 52, a painting chamber 53, and an exhaust chamber 54. The air chamber 52 and the painting chamber 53 are separated by a filter 55 for removing fine dust, and the painting chamber 53 and the exhaust chamber 54 are separated by a screen 56.

A conveyor 57 is installed on the upper surface of the screen 56 in the longitudinal direction of the painting room 53, and on this conveyor 57, a urethane pan type W, which is an object to be painted, is placed and conveyed. A plurality of dogs 59 are provided to be hooked to the cart 58.

Moreover, rails 60a260 are provided on both sides of this conhair 57.
rails 60a and 60b are laid, and the trolley 58 is guided by these rails 60a and 60b. Furthermore, a painting operator Y having a spray gun 61 is placed in the painting room 53, and a cart 5 transported by a conveyor 57 is installed.
The paint T is sprayed following the urethane pan type W shown above.

Furthermore, water supply gutters 62a and 62b are arranged horizontally in the longitudinal direction on both side walls of the exhaust chamber 54, and inside thereof there are flow plates 63a and 63b extending downward on opposite sides. Water H overflowing from the water supply gutters 62a and 62b flows down and falls to the bottom of the exhaust chamber 54 from the central outlet 63c.

Further, an exhaust duct 64 is connected to the exhaust chamber 54, and an exhaust fan 65 is provided in the middle of the exhaust duct 64. The exhaust duct 64 is connected to a deodorizing device 66 of direct combustion type, catalytic combustion type, or activated carbon adsorption type, so that organic solvents in the exhaust air discharged from the exhaust chamber 54 are deodorized. It has become. In addition, the air supply chamber 52
An air supply duct 67 is connected to the duct, an air supply fan 68 is provided in the middle thereof, and an air conditioner 69 is connected to the tip.

When painting the urethane pan type W, conditioned air adjusted to a predetermined temperature and humidity by the air conditioner 69 is supplied to the air supply chamber 52 by the air supply fan 68, and is passed through the filter 5m before painting. The conditioned air is supplied evenly to the chamber 53, and together with this conditioned air, the paint mist that has not been applied to the urethane pan type W is discharged to the exhaust air 54 by the exhaust fan 65.
The paint mist is removed from the conditioned air by contacting with the water H flowing down above b, and the conditioned air from which the paint mist has been removed is introduced into the deodorizing treatment device 66 through the exhaust duct 64 by the exhaust fan 65. The organic solvent is deodorized and discharged outside.

However, in such a painting booth, in order to protect the painting worker Y from organic solvents, a general ventilation system is adopted in which conditioned air is evenly supplied throughout the painting room 53. Therefore, the volume of exhaust air discharged from the exhaust chamber 54 is large, and not only does deodorization require an enormous amount of cost, but it is also necessary to deodorize a very small amount of organic solvent from the large volume of air to be treated. However, there is a problem that deodorizing treatment cannot be carried out efficiently.

[Purpose of the invention]

The present invention was made in order to eliminate the above-mentioned problems, and its purpose is to completely exhaust the entire paint booth.
'1 By combining exhaust treatment and local exhaust treatment, the amount of deodorizing air discharged from the paint booth can be reduced, and paint booth exhaust can efficiently capture only the exhaust air with a high concentration of hydrocarbons. The purpose of the present invention is to provide an air treatment method and device.

[Structure of the invention]

In order to achieve the above object, the present invention provides an exhaust treatment method for a painting booth at multiple locations in a local hood disposed along a conveyance line where objects to be painted are transferred and painted. , the hydrocarbon concentration is measured, and the exhaust air from areas where the hydrocarbon concentration is high is passed through a deodorizing treatment device to be deodorized, and the exhaust air from areas where the hydrocarbon concentration is low is passed through an outdoor exhaust treatment device. It is designed to be passed through and treated for exhaust.

Furthermore, the configuration of the exhaust treatment device for a painting booth according to the present invention includes a local hood disposed along the conveyance line of the objects to be painted arranged in the longitudinal direction of the painting booth, and a plurality of local hoods arranged in the local hood. In addition to installing exhaust ducts in series, filters and hydrocarbon measuring meters are sequentially installed in each exhaust duct, each of these exhaust ducts is branched into two routes, and one branch duct is a main duct that leads to a deodorizing treatment device. At the same time, the other branch duct is connected to the main duct leading to the outdoor exhaust treatment equipment, and each of the two branch ducts is provided with an opening/closing damper, and a hydrocarbon measuring meter installed in the exhaust duct is installed. The output side of the branch duct is connected to the opening/closing damper of the branch duct.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a paint booth exhaust treatment method and apparatus according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic front view showing an exhaust treatment device for a paint booth according to the present invention, FIG. 2 is a reduced sectional view taken along line nm in FIG. 1, and FIG. 3 is a mm-m in FIG. It shows a reduced cross-sectional view along the line.

[Configuration of Example]

In Figures 1 to 3, ■ is a painting booth formed in the shape of a tunnel, and the space inside this painting booth 1 is formed in order into the air supply chamber 2, the painting chamber 3, and the exhaust chamber 4. 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.

An air supply duct 7 is connected to the air supply chamber 2,
An air supply fan 8 is provided in the middle, and an air conditioner 9 is connected to the tip. Further, both ends of the painting room 3 in the longitudinal direction are open, and a conveyor 10 is installed on the upper surface of the screen 6 in the painting room 3 in the longitudinal direction. The conveyor 10 is provided with a plurality of upright dogs 11, and the dogs 11 are hooked onto a cart 12 on which the urethane bread type W, which is the object to be coated, is placed and transported. It has become.

Further, two rails 13a and 13b are laid on both sides of the conveyor 10 in parallel with the conveyor 10, and the trolley 12 is guided by these rails 13a and 13b. A painting operator Y with a spray gun 14 is disposed on the side of the rail 13a, and sprays paint following the urethane pan type W on the trolley 12 that is transported by the conveyor IO. ing.

Further, on both side walls inside the exhaust chamber 4, water supply devices 15a and 1 are provided, each having a cross section shaped like this along the longitudinal direction of the exhaust chamber 4.
5b is provided horizontally, and inside thereof there are flow plates 16a, 1 extending downward on opposite sides.
6b is provided. When painting with the urethane pan type W, water H is overflowed from the water supply devices 15a and 15b and poured onto the flow plays 16a and 16b to form a water film that contains the paint mist discharged from the painting chamber 3. Paint mist is captured while making contact with conditioned air.

In addition, an exhaust duct 17 is connected to the exhaust chamber 4.
One end thereof is connected to the outdoor exhaust treatment device 18 . An exhaust fan 19 is provided in the middle of the exhaust duct 17 to suck exhaust air discharged from the painting room 3 and supply it to the outdoor exhaust treatment device 18.

Further, above the conveyor 10 disposed in the painting room 3, a local hood 20 is disposed along the conveyor 10. The local hood 20 has a substantially U-shaped cross section, and is open on the painting operator Y side. Further, a plurality of discharge ducts 21 are connected to the opposite surface of the open side, and each discharge duct 21 is provided with a filter 22 and a hydrocarbon measuring type 23, respectively.

The other end of the exhaust duct 21 is branched into two paths, and each of the first branch ducts 24 is a main duct leading to a deodorizing treatment device 26 such as a direct combustion type, catalytic combustion type, or activated carbon adsorption type. The other second branch duct 25 is connected to the exhaust duct 17 which is the main duct leading to the outdoor exhaust treatment device 18.
It is connected to.

Further, an opening/closing damper 28 is provided in each of the first branch duct 24 and the first branching duct 24, and the degree of opening/closing of the opening/closing damper 28 is adjusted by opening/closing air 29 such as a motor.

This opening/closing air 29 is connected to the output side of the hydrocarbon measuring meter 23 by a conductor 30, and is opened/closed depending on the amount of hydrocarbons in the exhaust air discharged from the local hood 20.
The exhaust air flow path is switched to either the first branch duct 24 or the second branch duct 25.

[Action of the invention]

In the paint booth exhaust air treatment system configured as described above, the air supply fan 8
As the air conditioner 9 and exhaust fan 19 operate, water H overflows from the water supply devices 15a and 15b in the exhaust chamber 4 and flows onto the flow plates 16a and 16b, forming a water film.

Then, the outside air is introduced into the air conditioner by the operation of the air supply fan 8, and the outside air is removed from dust and adjusted to a predetermined temperature and humidity before being supplied to the air supply chamber 2. The conditioned air supplied to the air supply chamber 2 passes through a filter 5 and is evenly supplied to the painting chamber 3.

Further, the urethane bread type W on the trolley 12 that has been transported by the Conhair 10 is transported from the entrance 3a of the painting room 3 in the direction of the arrow. When the urethane pan type W is transferred into the painting room 3, the painter Y moves to the front of the urethane pan type W and sprays the paint worker Y from the open side of the local hood 20. Paint is sprayed by a gun. Then, the painting worker Y follows the movement of the urethane pan type W and sprays the paint to form a predetermined coating film. 3b, it is transferred to the next step in the direction of the arrow.

On the other hand, when painting the urethane pan type W, the hydrocarbon concentration in each zone within the local hood 20 is continuously measured by the hydrocarbon measuring meter 23.

In the zone where urethane pan type W is painted, a lot of paint mist is generated and the concentration of hydrocarbons is also high, so the exhaust system is connected to the passage of the second branch duct 25 by the hydrocarbon measurement system. is closed by the opening/closing damper 28, and the passage of the first branch duct 24 is opened by the opening/closing damper 28. As a result, paint mist is removed from the exhaust air discharged from the zone where painting is being performed by the filter 22, and
It passes through the discharge duct 21, the first branch duct 24, and the main duct 27, is introduced into the deodorizing treatment device 26, is deodorized, and is discharged to the outside.

In addition, in the zone where the urethane pan-type W is not painted, almost no paint mist is generated and the hydrocarbon concentration is low, so the exhaust system is checked by a hydrocarbon meter to check the first branch duct 24. The passage is closed by the opening/closing damper 28, and the passage of the second branch duct 25 is opened by the opening/closing damper 28. As a result, paint mist is removed from the exhaust air discharged from the zone where painting is not performed by the filter 22, and the exhaust duct 21,
It passes through the second branch duct 25 and the exhaust duct 17, is introduced into the outdoor exhaust treatment device 18, undergoes exhaust treatment, and is discharged to the outside.

2. The above-mentioned exhaust system moves as the coating position of the urethane pump is transferred, and the opening/closing degree of the opening/closing damper 25 is adjusted by the hydrocarbon measurement system 23, and the exhaust air in the zone with a high concentration of hydrocarbons is moved. is introduced into the deodorizing treatment device 26 and subjected to deodorization treatment, and the exhaust air in the zone where the concentration of hydrocarbons is low is introduced into the outdoor exhaust treatment device 18 and subjected to exhaust treatment.

Furthermore, paint mist floating in the painting room 3 other than the local hood 20 is caused to pass through the screen 6 and into the exhaust room 4 by the conditioned air that is supplied from the air supply room 2 through the filter 5 into the painting room 3. be discharged.

Then, the conditioned air containing paint mist discharged into the exhaust chamber 4 is pumped over 7+:1 from the water supply machines 15a and 15b.
- L77tff - Water film flowing on the plates 16a, 16b and water H at the tips of the flow plates 16a, 16b.
The paint mist is removed from the conditioned air by violent contact with the paint mist, and the conditioned air from which the paint mist has been removed is discharged to the outside from the exhaust duct 17 by the exhaust fan 19.

〔Effect of the invention〕

As explained above, in the paint booth exhaust air treatment method according to the present invention, the hydrocarbon concentration in each zone in the local hood is continuously measured using a hydrocarbon measuring meter, and the hydrocarbon concentration in the measured value is The exhaust air in the zone with high hydrocarbon concentration is passed through a deodorizing treatment device to be deodorized, and the exhaust air in the zone with low concentration of hydrocarbons is passed directly through the exhaust needle in the paint booth for exhaust treatment. It is possible to intensively capture only exhaust air with a high hydrocarbon concentration that requires deodorization, and has the effect of significantly reducing the air volume for deodorizing treatment.

Further, in the exhaust air treatment method of the present invention, the amount of deodorizing treatment air is significantly reduced, so that only exhaust air with a high hydrocarbon concentration can be efficiently treated.

In addition, in the exhaust air treatment device for a painting booth according to the present invention, a local hood is arranged along the conveyance line of the object to be painted, and a plurality of exhaust ducts are connected to this local hood. The exhaust system of the local hood and the exhaust system inside the local hood can be treated using separate routes, which has the effect of making the exhaust treatment more efficient.

In addition, in the exhaust treatment device of the present invention, since the local hood is arranged along the conveyance line of the object to be painted, it is possible to intensively capture only the exhaust air in the local hood where a large amount of paint mist is generated. This has the effect of preventing the amount of conditioned air supplied into the painting booth from being reduced.

In addition, the exhaust treatment device of the present invention can intensively process only exhaust air with a high concentration of hydrocarbons that requires deodorization treatment, significantly reducing running costs such as electricity for deodorization treatment. There is an effect that can be done.

Furthermore, since the deodorizing device becomes more compact, the initial cost can also be significantly reduced.

[Brief explanation of the drawing]

FIG. 1 is a schematic front view showing an exhaust treatment device 5 for a paint booth according to the present invention. FIG. 2 is a reduced sectional view taken along line nm in FIG. 1. FIG. 3 is a reduced sectional view taken along line nr-m in FIG. 1. FIG. 4 is a schematic cutaway front view of a conventional painting booth. 1-・--・-Painting booth 2------1 Air chamber 3-----1 Painting room 3 a-------Population 3b---Exit 4-----1 Exhaust room 5 ------- Filter 6 - - - Screen 7 - - Air supply duct 8 - - Air supply fan 9 - - Air conditioner 10 - - -Conveyor 11-----Dog 6 IS"--One trolley 13 a, 13 b--Rail 14--Spray gun 15 a, I 5 b-----Water gutter 16a, 1
6 b------Flow plate 17------Exhaust duct 18------One outdoor exhaust treatment device 19------Exhaust fan 20---One local hood 21- --- Exhaust duct 22 --- Filter 23 --- Hydrocarbon measuring needle 24 --- First branch duct 25 --- Second branch duct 26 --- - Deodorization processing device 27 ---- Main duct 28 - Opening/closing damper 29 - Opening/closing machine 30 - One conductor Applicant Toyota Motor Corporation Procedural Amendment (Method) 1. Display of case 1982 Patent Application No. 220427 2, Name of invention Painting booth exhaust air treatment method and its device 3, Person making amendment Relationship with case Patent applicant address 1 Toyota-cho, Toyota Kata, Aichi Prefecture 471 Showa 59
February 28, 2015 5, Specification subject to amendment 6, contents of amendment as shown in attached sheet

Claims (1)

[Scope of Claims] (11) The hydrocarbon concentration is measured at multiple locations in the local hood installed along the conveyance line where the object to be coated is transferred and coated in the coating booth, and carbonization occurs at the measurement locations. A painting booth characterized in that exhaust air from areas with high hydrogen concentration is passed through a deodorizing treatment device to be deodorized, and exhaust air from areas where hydrocarbon concentration is low is passed through an outdoor exhaust treatment device for exhaust treatment. (2) A local hood is installed along the conveyance line for the objects to be coated that are installed in the longitudinal direction of the painting booth, and a plurality of exhaust ducts are connected to the local hood. A filter and a hydrocarbon measuring needle are sequentially installed in each of these discharge ducts, and each of these discharge ducts is branched into two routes, one branch duct is connected to the main duct leading to the deodorization processing device, and the other A branch duct is connected to the main duct leading to the outdoor exhaust treatment equipment, an opening/closing damper is provided for each of the two branch ducts, and the output side of the hydrocarbon measuring needle provided in the discharge duct is connected to the branch duct. An exhaust air treatment device for a paint booth, characterized in that it is connected to an opening/closing damper.