JPH0143191Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a paint booth with controlled air supply and displacement.

[Prior art]

Conventionally, for example, in a painting booth in which objects to be painted, such as automobile bodies, are continuously conveyed by a conveyor or other conveyor, and painted by an automatic painting machine such as a painting robot or a reciprocator, as shown in FIG. Dry painting booths like this are used.

In FIG. 3, reference numeral 51 denotes a paint booth formed in the shape of a tunnel;
The interior space is formed into three chambers: 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 for removing fine dust.
It is divided into a painting room 53 and an exhaust room 54.
It is divided with the boundary between the two.

A conveyor 57 is installed in the longitudinal direction on the upper surface of the bamboo basket 56, and rails 58, 58a are installed on both sides of the conveyor 57. Further, automatic painting machines 59, 59a such as painting robots are installed on both sides of the painting room 53, and each of these automatic painting machines 59, 59a is equipped with a spray gun 6.
0.60a are provided. And trolley 61
When the above automobile body W is transported to the automatic painting machine 59, 59a, the spray gun 60,
The paint is sprayed by 60a to form a paint film.

Further, an air supply duct 62 is connected to the ceiling wall 52a of the air supply room 52, and an air conditioner 63 is connected to the tip thereof, and an air supply fan 64 is installed below it. ing. In addition, the exhaust chamber 54 includes a nonwoven fabric for capturing paint mist.
A filter 65 made of cloth, paper, etc. is disposed throughout the width direction and length direction, and an exhaust duct 67 with an exhaust fan 66 provided in the middle is connected to the side wall 54a.

When painting the automobile body W, the air conditioner 63 supplies conditioned air with a predetermined temperature and humidity to the air supply chamber 52 through the air supply fan 64, and the air is passed through the filter 55. The liquid is evenly supplied to the painting room 53. And painting room 53
Together with the conditioned air supplied to the vehicle body W, the paint mist that has not been applied to the vehicle body W is exhausted to the exhaust chamber 54 by the exhaust fan 66, and the exhaust air is passed through a filter 65 disposed in the exhaust chamber 54. Paint mist is removed from inside.

However, in such a dry painting booth, the filter 6 disposed in the exhaust chamber 54
5. Paint mist in the exhausted air adheres to the exhaust air in proportion to the usage time, causing clogging. Therefore, the air resistance of the filter 65 increases, and the amount of conditioned air exhausted from the painting chamber 53 to the exhaust chamber 54 becomes smaller than the amount of conditioned air supplied to the painting chamber 53. As a result, the pressure balance within the painting chamber 53 is disrupted, causing a large amount of conditioned air containing paint mist to flow out from the inlet/outlet, resulting in a problem that the paint mist in the conditioned air contaminates the surrounding area. On the other hand, due to the delay in replacing the filter 65 and the constant maintenance work, the filter 65 may become thinner.
There may be holes. Therefore, the air resistance of the filter 65 becomes small, and the amount of conditioned air exhausted from the painting chamber 53 to the exhaust chamber 54 becomes larger than that of the air supply chamber supplied to the painting chamber 53. As a result, the pressure balance inside the coating chamber 53 is disrupted, and dirty air from outside the coating chamber 53 flows in through the entrance and exit, and foreign matter such as dust contained in the air adheres to the surface of the object to be coated, resulting in the coating of particles and the like. There is a defect that causes a defect.

[Purpose of invention]

This invention was devised to solve the above-mentioned problems.The purpose of this invention is to install a wind speed sensor on the downstream side of the filter and at least one of the entrance and exit of the painting room, and to control the air conditioning based on the wind speed measured by the wind speed sensor. By controlling the amount of air supplied and the amount of exhaust air discharged, the pressure balance within the painting room can be adjusted, and a large amount of air conditioned air inside the painting room can be prevented from flowing out and air from outside the painting room can be prevented from entering. Our objective is to provide a quantity control type painting booth.

[Structure of the idea]

In order to achieve the above object, the configuration of the air supply/exhaust control type painting booth according to the present invention is such that the space inside the booth is divided into an air supply chamber, a painting chamber, and an exhaust gas chamber from above, with the filter and the screen as boundaries, respectively. The painting is formed into three chambers, the air supply chamber is connected with an air supply duct that supplies conditioned air, and the exhaust chamber is connected with an exhaust duct that discharges exhaust air exhausted from the painting chamber. In the booth, a wind speed sensor is provided on the downstream side of a filter disposed at the boundary between the air supply room and the painting room, and at least one of the entrance and exit of the painting room, and the wind speed sensor on the downstream side of the filter is provided. Controlling the supply amount of conditioned air supplied to the air supply room based on the measured wind speed value, and exhausting the exhaust air exhausted from the painting room based on the wind speed measurement value of the wind speed sensor at at least one of the entrances and exits of the painting room. The amount is controlled.

[Effect of invention]

In such a paint booth with controlled air supply and displacement,
When painting an object to be painted, such as an automobile body, conditioned air that has been cleaned of dust and adjusted to a predetermined temperature and humidity is supplied from an air supply duct to an air supply chamber, and then passed through a filter and supplied to a painting chamber. Ru. The conditioned air supplied to the painting room passes through the screen along with the paint mist and is exhausted to the exhaust chamber, where the paint mist is removed and becomes clean exhaust air, which is discharged to the outside from the exhaust duct. .

A wind speed sensor installed downstream of the filter constantly measures the wind speed of the conditioned air supplied to the painting room, and if the measured value deviates from a preset wind speed value, The air flow rate of the conditioned air supplied from the air supply duct to the painting room through the air supply chamber is corrected based on the wind speed measurement value of the wind speed sensor, and the air supply amount is adjusted to a predetermined amount. Ru.

On the other hand, a wind speed sensor installed at at least one of the entrances and exits of the painting room constantly measures the wind speed of the conditioned air flowing out from the entrance and exit, and the measured value deviates from the preset wind speed value. In this case, based on the wind speed measurement value of the wind speed sensor, the exhaust volume of the exhaust air that is exhausted from the painting room through the screen to the exhaust chamber and released to the outside from the exhaust duct is corrected and then flows out of the painting room. The conditioned air is discharged in a predetermined amount.

As a result, even if the air resistance differs due to the filter becoming thinner or having holes due to filter clogging, delayed replacement, or insufficient maintenance, the air supply and exhaust volume can be quickly corrected to the specified amount. As a result, the pressure balance in the painting chamber is always maintained at a predetermined positive pressure, and a large amount of conditioned air containing paint mist can be prevented from flowing out and air containing foreign matter such as dust can be prevented from flowing in.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a partially cutaway front view of a supply/displacement control type painting booth according to the present invention, and FIG. 2 is a side view taken along the line - in FIG. 1.

1 and 2, reference numeral 1 denotes a paint booth formed in the shape of a tunnel, and the space inside this paint booth 1 consists of three rooms, sequentially from above: an air supply chamber 2, a painting chamber 3, and an exhaust chamber 4. It is formed in
The air supply chamber 2 and the painting chamber 3 are divided by a filter 5 for removing fine dust, and the painting chamber 3 and the exhaust chamber 4 are divided by a screen 6 as a boundary.
Both ends of the coating chamber 3 in the longitudinal direction are open, one serving as an inlet 3a and the other serving as an outlet 3b, and the air supply chamber 2 and exhaust chamber 4 are closed.

The filter 5 disposed at the boundary between the air supply chamber 2 and the painting chamber 3 is made of acetate-based cloth and has microporosity of 30 μm or less. The thickness of the filter 5 is approximately 20 mm. Furthermore, the screen 6 disposed at the boundary between the painting chamber 3 and the exhaust chamber 4 is made of metal material, and has a large number of evenly formed passage holes 6a, with an aperture ratio of about 90%. has been done.

Further, an air supply duct 7 is connected to the air supply chamber 2, and an air supply fan 8 whose blade angle is variable is provided in the middle of the duct 7, and an air conditioner 9 is installed on the upstream side of the air supply fan 8. It is provided. The air supply fan 8 is provided with a driving air 8a for setting the blade angle.

Further, a conveyor 10 is installed on the upper surface of the screen 6 of the painting room 3 in the longitudinal direction of the central part of the painting room 3, and an automobile body W, which is an object to be painted, is placed on this conveyor 10. A plurality of dogs 12 are provided to be hooked to a cart 11 for transportation.

Rails 13a and 13b each having a shaped cross section are laid on both sides of the conveyor 10, and the trolley 11 is supported by these rails 13a and 13b.
It is now designed to guide you. Furthermore, automatic painting machines 14a and 14b such as reciprocators and painting robots are disposed on the sides of both rails 13a and 13b, and a spray gun 15a that sprays paint T toward the automobile body W is installed at the tip of the automatic painting machines 14a and 14b. , 15b
is provided.

Further, a filter 16 made of non-woven fabric, cloth, paper, etc. is disposed above the interior of the exhaust chamber 4 over the entire width and length directions, and is designed to capture paint mist discharged from the painting chamber 3. There is.

Further, an exhaust duct 17 is connected below the filter 16 of the exhaust chamber 4, and one end of the exhaust duct 17 is open to the atmosphere. An exhaust fan 18 whose blade angle is variable is provided in the middle of this exhaust duct 17, and the operation of this exhaust fan 18 sucks the conditioned air inside the painting room 3, It is designed to be discharged to the outside from an exhaust duct 17. Further, the exhaust fan 18 is provided with a driver 18a that adjusts the blade angle.

Further, a first wind speed sensor 1 is located downstream of the filter 5 disposed at the boundary between the air supply chamber 2 and the painting chamber 3.
9 is provided so that the wind speed of room-conditioned air supplied from the air supply chamber 2 to the painting room 3 after passing through the filter 5 is constantly detected.

Also, outside the painting booth 1, there is a first detector 20 that measures the wind speed value detected by the first wind speed sensor 19, and a supply air A first setting device 21 is provided to control the driver 18a, which continuously controls the blade angle of the fan 8, to an optimum state.

The input side of the first detector 20 is a conducting wire 22a.
is connected to the output side of the first wind speed sensor 19 by a wire 22b, and the output side is connected to the input side of the first setting device 21 by a conductive wire 22b. Further, the output side of the first setting device 21 is connected to a driver 8a for adjusting the blade angle of the air supply fan 8 through a conductive wire 22c.

Further, a second wind speed sensor 23 is provided above the entrance 3a of the painting room 3.
The wind speed of the conditioned air flowing out from a is constantly detected.

Also, near the outside of the painting room 3, there is a second detector 2 for measuring the wind speed value detected by the second wind speed sensor 23.
4, and a second setting device 25 that controls the drive device 18a that continuously controls the blade angle of the exhaust fan 18 to an optimal state based on the measurement value signal measured by the second detector 24. has been done.

The input side of the second detector 24 is a conducting wire 26a.
is connected to the output side of the second wind speed sensor 23, and the output side is connected to the input side of the second setting device 25 via a conducting wire 26b. Further, the output side of the second setting device 25 is connected to a driver 18a for adjusting the blade angle of the exhaust fan 18 by a conductive wire 26c.

Further, a predetermined wind speed value of the conditioned air that is supplied from the air supply chamber 2 to the painting room 3 after passing through the filter 5 is set in the first setting device 21 in advance. Filter 5 in
The wind speed of the conditioned air passing through is set to be always constant at 0.5 m/sec. If the wind speed value detected by the first wind speed sensor 19 deviates from 0.5 m/sec, the first setting device 21 instructs the driver 8a based on the measurement value signal from the first detector 20. The wind speed of the conditioned air supplied to the painting room 3 where the signal is transmitted and the blade angle of the air supply fan 8 is adjusted is
It is now controlled at 0.5m/sec.

Further, the second setting device 25 includes an inlet 3 of the painting room 3.
A predetermined wind speed value of the conditioned air flowing out from a is set in advance. For example, when painting an automobile body W, the wind speed of the conditioned air flowing out from the entrance 3a of the painting room 3 is always between 0.1 and 0.2 m/sec. is set to be. Then, the wind speed value detected by the second wind speed sensor 23 is 0.1 to 0.2 m/sec.
If it is out of the range, an instruction signal is transmitted from the second setting device 25 to the driver 18a based on the measured value signal from the second detector 24, and the exhaust fan 18
The angle of the blades is adjusted to adjust the amount of exhaust air discharged from the painting room 3 through the screen 6 and into the exhaust chamber 4, and the wind speed of the conditioned air flowing out from the inlet 3a of the painting room 3 is 0.1. It is designed to be controlled within the range of 0.2 m/sec.

In the air supply/displacement control type painting booth configured as described above, the air supply fan 8, air conditioner 9, and exhaust fan 1 are installed at the same time as the painting booth 1 starts operating.
8 respectively operate. When the air supply fan 8 operates, outside air is introduced into the air conditioner 9, and the conditioned air, which has been cleaned of dust and adjusted to a predetermined temperature and humidity, is sent from the air supply duct 7 to the air supply room. 2. The conditioned air supplied to the air supply chamber 2 passes through the filter 5 and enters the painting chamber 3.
It is evenly supplied with a wind speed of 0.5m/sec. that time,
The filter 5 captures fine dust that could not be removed by the air conditioner 9 in the conditioned air, and a rectifying effect is applied to the conditioned air.

Further, the automobile body W on the trolley 11 that has been conveyed by the conveyor 10 is placed at the entrance 3a of the painting room 3.
The automatic coating machine 14
When it is transported to the vicinity of points a and 14b, the paint T is sprayed by spray guns 15a and 15b to form a paint film. In this way, the automobile body W is sprayed with the paint T while being conveyed by the conveyor 10 to complete the painting, and is then conveyed from the outlet 3b of the painting room 3 to the next process.

In addition, paint mist that is scattered during painting of the automobile body W passes through the air supply chamber 2 through the filter 5 and is evenly supplied with the air conditioned air, and passes through the passage hole 6a of the screen 6 and is exhausted to the exhaust chamber 4. The paint mist is removed from the exhaust air as it passes through the filter 16. Then, the clean exhaust air from which paint mist has been removed is discharged to the outside from the exhaust duct 17 by the exhaust fan 18.

In the air supply system of the painting booth 1, the first wind speed sensor 19 is activated at the same time as the operation starts, and the wind speed of the conditioned air that is supplied from the air supply chamber 2 to the painting room 3 after passing through the filter 5 is detected. has been done. Also,
The wind speed value detected by the first wind speed sensor 19 is measured by the first detector 20, and the measured value is transmitted to the first setting device 21.

Then, the first setting device 21 matches the relationship between the measured value of the first detector 20 and the preset wind speed value (0.5 m/sec) based on the transmitted measurement value signal. If the wind speed values are equal to each other, an instruction signal is transmitted to the driver 8a, and the blade angle of the air supply fan 8 is continued as it is based on the instruction signal transmitted previously, and the air supply fan 8 is moved from the air supply chamber 2 to the filter 5. The conditioned air is continuously supplied to the painting room 3 at a wind speed of 0.5 m/sec.

Further, if the wind speed value detected by the first wind speed sensor 19 is different from the preset wind speed value, the first setting device 21
An instruction signal is transmitted to a, and the blade angle of the air supply fan 8 is adjusted. For example, when the wind speed value from the first wind speed sensor 19 is lower than a preset wind speed value, the blade angle of the air supply fan 8 is increased.
As a result, the amount of air conditioned air supplied from the air supply chamber 2 to the painting room 3 after passing through the filter 5 is increased, and the wind speed of the conditioned air supplied to the painting room 3 is set to a predetermined value of 0.5 m. /sec. Also, the first
When the wind speed value from the wind speed sensor 19 is higher than a preset wind speed value, the blade angle of the air supply fan 8 is reduced. As a result, the amount of air conditioned air supplied from the air supply chamber 2 to the painting room 3 after passing through the filter 5 is reduced, and the wind speed of the conditioned air supplied to the painting room 3 is kept at a predetermined value of 0.5 m. /sec.

On the other hand, in the exhaust system of the painting booth 1, the second wind speed sensor 23 is activated at the same time as the start of operation, and the wind speed of the conditioned air flowing out from the entrance 3a of the painting room 3 is detected. Further, the wind speed value detected by the second wind speed sensor 23 is measured by the second detector 24, and the measured value is transmitted to the second setting device 25.

Then, the second setter 25 determines the relationship between the preset wind speed value (0.1 to 0.2 m/sec) based on the transmitted measurement value signal, and sets the preset wind speed value between the second detector 24 and the preset wind speed value. If the values are equal, an instruction signal is transmitted to the driver 18a, and the blade angle of the exhaust fan 18 continues as it is based on the previously transmitted instruction signal, and the blade angle is continued from the painting room 3 to the screen 6. The amount of exhaust air exhausted into the exhaust chamber 4 is adjusted, and the conditioned air flowing out from the inlet 3a of the painting chamber 3 is continuously flowed out at a wind speed of 0.1 to 0.2 m/sec.

Further, when the wind speed value detected by the second wind speed sensor 23 is different from the preset wind speed value, an instruction signal is transmitted from the second setting device 25 to the driver 18a of the exhaust fan 18, The blade angle is adjusted. For example, the second wind speed sensor 2
When the wind speed value from 3 is lower than the preset wind speed value, the blade angle of the exhaust fan 18 is reduced. As a result, the amount of exhaust air discharged from the painting room 3 through the screen 6 and into the exhaust chamber 4 is reduced, and the flow velocity of the conditioned air flowing out from the inlet 3a of the painting room 3 is at a predetermined value of 0.1 to 0.1. 0.2m/sec
controlled within the range of In addition, the second wind speed sensor 23
When the wind speed value from the exhaust fan 18 is higher than a preset wind speed value, the blade angle of the exhaust fan 18 is increased. As a result, the amount of exhaust air that is discharged from the painting room 3 through the screen 6 and into the exhaust chamber 4 is increased, and the wind speed of the conditioned air flowing out from the inlet 3a of the painting room 3 is set to a predetermined value of 0.1 to 0.1. Controlled within a range of 0.2m/sec.

Although this embodiment has been explained using a dry coating booth that captures paint mist using a filter, the present invention also applies to a wet coating booth that captures paint mist using circulating water. effect can be obtained.

[Effect of idea]

As explained above, in the air supply/exhaust volume control type painting booth according to the present invention, a wind speed sensor is provided at least one of the downstream side of the filter and the entrance/exit of the painting room, and based on the wind speed measurement value of the wind speed sensor, By controlling the amount of conditioned air supplied to the chamber and the amount of exhaust air exhausted to the exhaust chamber, the pressure balance in the painting chamber can always be maintained in a normal state. This has the effect of preventing a large amount of air conditioned air from flowing out and air from outside the painting room flowing in.

In addition, in the present invention, by preventing a large amount of air conditioned air from flowing out in the painting room, a large amount of air conditioned air containing paint mist is prevented from flowing out, thereby preventing air pollution caused by paint mist. It has the effect of

In addition, in this invention, by preventing the inflow of air from outside the painting room, the adhesion of foreign matter such as dust to the object to be painted inside the painting room is prevented, thereby reducing the occurrence of painting defects such as spots. There is an effect that can be prevented.

In addition, in this invention, by preventing a large amount of conditioned air from flowing out in the painting room, wasteful flow of conditioned air is eliminated, and energy such as steam and electricity for adjusting conditioned air is saved. There is an effect that can be done.

[Brief explanation of the drawing]

FIG. 1 is a front view, partially cut away, of a paint booth with controlled air supply and displacement according to the present invention. Figure 2 is the first
It is a side view cut along the - line of a figure. FIG. 3 is a cutaway front view of a conventional dry coating booth. 1...Painting booth, 2...Air supply room, 3...Painting room, 3a...Inlet, 3b...Outlet, 4...Exhaust chamber, 5...Filter, 6...Bamboo shoots, 6a...Passing hole , 7...Air supply duct, 8...Air supply fan, 8
a...Driver, 9...Air conditioner, 10...Conveyor, 11...Dolly, 12...Dog, 13a, 1
3b...Rail, 14a, 14b...Automatic painting machine, 15a, 15b...Spray gun, 16...
Filter, 17... Exhaust duct, 18... Exhaust fan, 18a... Driver, 19... First wind speed sensor, 20... First detector, 21... First setting device,
22a, 22b, 22c...Conducting wire, 23...Second
Wind speed sensor, 24... second detector, 25... second
Setting device, 26a, 26b, 26c... conductor.

Claims (1)

[Scope of utility model registration request] 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 screen as boundaries, and an air supply duct is connected to supply conditioned air to the air supply room. and a painting booth in which an exhaust duct for discharging exhaust air exhausted from the painting room is connected to the exhaust chamber, the downstream side of a filter disposed at the boundary between the air supply room and the painting room. and at least one of the entrances and exits of the painting room, and the amount of conditioned air supplied to the air supply room is controlled based on the wind speed measurement value of the wind speed sensor downstream of the filter, and the painting A supply/exhaust volume control type painting booth characterized in that the amount of exhaust air exhausted from a painting room is controlled based on a wind speed measurement value of a wind speed sensor at at least one of the entrances and exits of the room.