JPH0757337B2 - Airflow control method in coating booth - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a coating booth airflow control method for flowing air into a coating booth when coating is performed while sequentially moving an object to be coated in the coating booth. Regarding

(Prior Art) Conventionally, when coating is performed while moving the coating object in the coating booth, the coating object is a plurality of consecutive coating objects, and each coating object is coated so as not to be exposed to mist-like paint. A device is made in the booth. In particular, it is necessary to prevent fluctuations in the air flow that occur when the necessary air begins to flow and when the flow of the air is stopped, before the coating is started and when the coating is finished in the coating booth. As a method for preventing this, there is a coating booth operating method disclosed in Japanese Patent Laid-Open No. 57-165062. As shown in FIG. 4, the coating booth used in this operation method is in the form of a tunnel having air supply chambers 1a and 1b in the upper portion and paint mist separation chambers 2a and 2b in the lower portion. A partition plate 4 is formed in the coating booth 3 and in the vertical direction of the doorway from the air supply chambers 1a, 1b to the paint mist separation chambers 2a, 2b. Each partition plate 4 ... Openable doors 6a, 6b, 6c are attached so that the vehicle body 5 can pass therethrough. And the air supply room
Air conditioners 8a and 8b are attached to the air supply fans 7a and 7b to the 1a and 1b, respectively, and an exhaust fan 9 is provided to the paint mist separation chambers 2a and 2b.
a and 9b are attached, and a damper-like pressure adjusting device 10 for adjusting the internal pressure is further provided on the side wall of the paint booth 3.
Is attached.

In this way, when the coating booth 3 is started up, the opening / closing doors 6a, 6b are first closed, and the air supply fan 7a and the exhaust fan 9 are closed.
When a is activated, the pressure adjusting device 10 adjusts the wind speed. Opening / closing door 6 when the vehicle body 5 approaches the zone 11a
When a is opened, the car body 5 enters the zone 11a and is painted. At this time, the wind speed in the zone 11b is also adjusted, and the vehicle body 5 moves to the zone 11b.
The door 6b is opened when the vehicle approaches, and the vehicle body is painted by entering the zone 11b. After painting the first vehicle body 5, the first vehicle body 5 is transported to the outside of the coating booth 3,
Painting of the second and subsequent vehicle bodies 5 is performed with the opening / closing door 6c open.

When the painting booth 3 is stopped, the final car body 5 is in zone 11b.
The doors 6a and 6b are closed at the stage of being separated from, and the air supply fan 7a and the exhaust fan 9a are stopped at the same time. After that, when the final vehicle body 5 leaves the zone 11b, the opening / closing opening 6c is closed to stop the air supply fan 7b and the exhaust fan 9b.

(Problems to be Solved by the Invention) With the above-described method of operating the coating booth, the operation is difficult in actual operation, the number of parts is large, and further improvement is required.

Therefore, in the present invention, a zone is formed between each air supply chamber and the exhaust chamber in the coating booth formed by facing the air supply chamber and the exhaust chamber, and the horizontal airflow direction and the wind speed for each zone are formed. The air supply amount in each zone increases or decreases in accordance with the above, and by controlling the speed, the air current is not generated horizontally between the zones, and the air flow is sequentially generated in each zone. An object of the present invention is to provide a method for controlling an air flow in a coating booth, which can start and stop the air flow between adjacent zones, and which can accurately control the suppression of turbulence.

(Means for Solving the Problems) A feature of the present invention for achieving the above-mentioned object is to supply air in the first half of the zones in which the air supply chamber and the exhaust chamber are opposed to each other in the coating booth. After starting the exhaust and generating the vertical air flow, when the object to be coated reaches the predetermined position in the first half zone, the exhaust volume in the second half zone is increased, and at this time, the horizontal air flow direction and the wind speed in the first half zone. Control the speed of increasing the air supply amount in the second half zone according to
When the exhaust gas in the second half zone reaches a predetermined amount, the air flow generation in the second half zone is set by controlling the air supply amount in the second half zone, while the air flow in the second half zone is set to the predetermined position in the second half zone. When the object to be coated arrives, the exhaust volume in the first half zone is reduced, and at this time, the speed at which the air supply volume in the first half zone is reduced is controlled according to the direction of the horizontal airflow in the second half zone and the wind speed. This is to stop the airflow in the first half zone by controlling the air supply amount in the first half zone when the exhaust gas volume in the zone becomes zero.

(Operation) According to the air flow control method in the coating booth described above, when the object to be coated is coated in the coating booth, the air supply in each zone is performed according to the horizontal air flow direction and the wind speed in each zone. By controlling the speed at which the amount increases and decreases, it is possible to accurately control the mixture of air flows between zones and the suppression of turbulence.

(Example) Hereinafter, the Example of this invention is described based on drawing. First
The drawing shows a coating booth operated by the airflow control method in the coating booth according to the present invention, and the configuration thereof will be described first. This coating booth has the same structure as that already described in the section of the prior art based on FIG. 4, and the detailed description thereof will be omitted by giving the same reference numerals to the parts.
In the upper part of the coating booth 3 shown in FIG. 1, there are provided air supply chambers 1a and 1b separated by a partition plate 4, ...
To the air supply fans 7a and 7b via ducts, and the air supply fans 7a and 7b are connected to well-known air conditioners 8a and 8b. The air supply fans 7a, 7b are provided with air supply fan control devices 12a, 12 for starting and stopping the rotation of the air supply fans 7a, 7b immediately after.
b is electrically connected, and each air supply fan control device 12
Air supply speed control devices 13a and 13b are electrically connected to a and 12b so that the speed at which the amount of air supplied by the air supply fans 7a and 7b is increased or decreased can be changed. The air supply fan control devices 12a, 12b and the air supply speed control devices 13a, 13b are electrically connected to a main control device 14 for centralized control. Like the upper part, the exhaust chambers 2a, 2b are located in the lower part of the coating booth 3 and are divided in half, and exhaust fans 9a, 9b are attached to the respective exhaust chambers 2a, 2b via ducts. Exhaust fan control devices 15a and 15b are attached to the fans 9a and 9b, and are electrically connected to the main control device 14 described above. Air supply room 1a, 1b described above
There is a space between the exhaust chambers 2a and 2b, and each air supply chamber 1
The a, 1b and the exhaust chambers 2a, 2b are formed to face each other, and a front half zone 11a and a rear half zone 11b are formed in each of the facing spaces. The well-known wind speed detectors 16a and 16b are provided at substantially intermediate positions in the longitudinal direction between the first half zone 11a and the second half zone 11b.
Are attached so that the velocity of a horizontal directional airflow generated in the first half zone 11a and the second half zone 11b can be detected. The wind speed detectors 16a and 16b are also electrically connected to the main controller 14, and can control the airflow in the first half zone 11a and the second half zone 11b according to the detected values. In the coating booth 3 having such a configuration, the car body 5 of the automobile, which is the object to be coated, applies the paint to the car body 5 while moving in the first half zone 11a and the second half zone 11b. It is now being conducted.

Next, the operation by the air flow control method in the paint booth of the present invention using the above-mentioned paint booth 3 is carried out by first generating the air flow sequentially in the first half zone 11a and the second half zone 11b as shown in FIG. Explain.

First, before the first vehicle body 5 enters between the air supply chamber 1a and the exhaust chamber 2a in the first half, the air supply fan control device 12a and the exhaust fan control device 15a are supplied by the main control device 14 respectively. The air fan 7a and the exhaust fan 9a are activated. At this time, the air supply speed control device 13a connected to the air supply fan control device 12a does not operate. The vehicle body 5 is in the first half zone 1
It enters 1a and is painted by a painting nozzle (not shown). Further, as the vehicle body 5 advances, the first half zone 11a
When it reaches the point A, the main controller 14 causes the air supply fan controller 12b and the exhaust fan controller 15 of the latter half zone 11b to be controlled.
b issues a start command to the air supply fan 7b and the exhaust fan 9b. The point A is an arbitrary point of the vehicle body 5 in the first half zone 11a, is related to the second half zone 11b, and is determined according to the state of the airflow in both zones. According to the above-mentioned command, the exhaust fan 9b in the latter half zone 11b is rotated by the exhaust fan control device 15b at a preset rotational speed increasing speed to increase the exhaust amount thereof. on the other hand,
The air supply fan 7b in the second half zone 11b rotates at a predetermined rotation speed under the control of the air supply fan control device 12b and the air supply speed control device 13b. Then, the exhaust amount by the exhaust fan 9b gradually increases until the exhaust amount reaches the set value B. The set value B can be controlled by the rotation speed of the exhaust fan 9b replaced with the exhaust amount. At this time, the first half zone
Part of the air flow in 11a is due to the exhaust fan 9b in the latter half zone 1
Although trying to move to 1b, the wind speed detector 16a in the first half zone 11a detects the horizontal wind speed in that zone, and the detected wind speed value in the direction indicated by the arrow (right) in FIG. When it is smaller than the predetermined value C, the air supply speed control device 13b connected to the air supply fan 7b rotating at the predetermined rotation speed of the latter half zone 11b is operated to increase the air supply amount. Speed up. This is, for example,
8 if the reference time required to start up to 100% is 100 seconds
Set to 0 seconds. This means that the start-up time for increasing the required air supply amount is shortened within the range in which the airflow in the first half zone 11a does not move horizontally in the second half zone 11b. When the wind speed value in the direction indicated by the arrow (left) in Fig. 1 detected by the wind speed detector 16a in the first half zone 11a is larger than the value D, the air flow in the second half zone 11b is horizontal to the first half zone 11a. Since there is a risk of movement, the air supply speed control device 13b connected to the air supply fan 7b is operated to decrease the speed at which the air supply amount increases. this is,
Contrary to the above, delay the start-up time to increase the air supply amount in the sense that the reference time required to start up the air supply amount from 0 to 100% is 120 seconds if 100 seconds is set as the reference time. That is.

In this way, by adjusting the start-up time to increase the amount of air supply by the air supply fan 7b, it is possible to prevent horizontal airflow from occurring in the first half zone 11a and the second half zone 11b,
The state of air flow mixing and turbulent flow control between zones is carried out quickly. When the rotation speed of the exhaust fan 9b increases and the exhaust amount reaches the set value B, the supply amount of the supply fan 7b is continuously controlled and the continuous coating operation is performed.

Next, as shown in FIG. 3, an explanation will be given of sequentially stopping the air flow in the first half zone 11a and the second half zone 11b. First, when the final vehicle body 5 enters the latter half zone 11b on the painting line and is painted and reaches the point E in the latter half zone 11b, the main controller 14 causes the exhaust fan to the exhaust fan controller 15a of the first half zone 11a. The stop command of 9a is issued, and the exhaust amount is reduced according to the rotation reduction speed preset in the exhaust fan control device 15a.

The point E is an arbitrary point in the traveling direction of the vehicle body 5 in the second half zone 11b, is related to the point A in the first half zone 11a, and is determined according to the airflow state in both zones. Then, the rotational speed is reduced until the exhaust amount by the exhaust fan 9a becomes zero. At this time, the wind speed is detected by the wind speed detector 16b in the latter half zone 11b, and the arrow (right) is shown in FIG. When the wind speed value in the direction shown below is smaller than F, the air supply speed control device 13 connected to the air supply fan 7a.
Activate a to increase the speed at which the air supply decreases. This means, for example, that if the reference time required to lower the supply air amount to 100 to 0% is 60 seconds, it will be 50 seconds, and the horizontal movement of the airflow in the latter half zone 11b will be performed. It is to accelerate the fall time to reduce the air supply amount within the range that does not occur. When the wind speed value in the direction indicated by the arrow (left) in Fig. 1 detected by the wind speed detector 16b in the latter half zone 11b is larger than G, the air flow in the latter half zone 11b is horizontal to the first half zone 11a. Since it is a dangerous value to move, the air supply speed control device 13 connected to the air supply fan 7a
Activate a to reduce the speed at which the air supply is reduced. Contrary to the above, this means that if the reference time required to reduce the air supply amount to 100 to 0% is 60 seconds, it will be 70 seconds. Then, delay the fall time to reduce the air supply amount, and adjust the latter half zone 11
Try to push back the air flow of b.

In this way, it is possible to prevent the horizontal airflow from being generated in the first half zone 11a and the second half zone 11b by adjusting the fall time when the air supply amount by the air supply fan 7a decreases.
Similar to the start-up time to increase the air supply amount described above,
The state of air flow mixing and turbulent flow control between zones is carried out quickly. Then, when the exhaust air amount from the exhaust fan 9a becomes zero, the air supply amount of the air supply fan 7a is continuously controlled, painting is performed in the second half zone 11b, and the vehicle body 5 is painted in the painting booth 3.
When it goes out from, the air supply fan 7a in the first half zone 11a, and the air supply fan 7b and the exhaust fan 9b in the second half zone 11b are stopped.

As mentioned above, at the start of booting, first the first half zone 11a
When the second half zone 11b is started and then stopped, the first half zone 11a can be stopped and then the second half zone 11b can be stopped. From this, at startup and shutdown,
Since it is not necessary to operate the first half zone 11a and the second half zone 11b at the same time, it is possible to save power and the like.

In this embodiment, the inside of the coating booth 3 is in the first half zone 11a.
The second half zone 11b and the latter half zone 11b are divided into two parts, but even if it is divided into three or more parts, it has the same effect as described above.

(Effects of the Invention) From the above, according to the air flow control method in the coating booth of the present invention, the air supply chamber and the exhaust chamber are opposed to each other in the coating booth to form each zone, and each zone is set in the horizontal direction. In order to prevent the generation of air flow, the air supply is accelerated and the rise time of the air supply increases as the air supply increases, and the fall time of the air supply decreases faster and slower. By doing so, the mixed state of the air flow between the zones can be controlled to a minimum, and the turbulent flow can be suppressed accurately.

In addition, since air supply and exhaust can be sequentially started and stopped in order to generate an air flow for each zone, energy can be saved because it can be started and stopped sequentially. Since it is not necessary to stop the vehicle, it is possible to save unnecessary driving.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a coating booth used in the present invention, FIG. 2 is a flow chart showing a starting state of the air flow control method in the coating booth of the present invention, and FIG. 3 is a diagram showing the present invention. FIG. 4 is a schematic diagram showing a coating booth used in the conventional operating method, which is a flow chart showing the state of the stopping operation of the airflow control method in the coating booth. 1a, 1b: Air supply chamber, 2a, 2b: Exhaust chamber 3: Painting booth, 5: Vehicle body 11a: First half zone, 11b: Second half zone 16a, 16b: Wind speed detector

Claims (1)

[Claims] 1. A coating booth is provided with an air supply chamber and an exhaust chamber which are opposed to each other, and in the first half of the zones divided into zones, air supply and exhaust are started to generate an air flow in a vertical direction, and then the coating is performed. When an object reaches a predetermined position in the first half zone, the exhaust amount in the second half zone is increased, and at this time, the speed at which the air supply amount in the second half zone is increased according to the direction of the horizontal airflow in the first half zone and the wind speed is set. When the exhaust amount of the second half zone is controlled to a predetermined amount, the air flow generation of the second half zone is set by controlling the air supply amount of the second half zone, while the predetermined amount in the second half zone of the zoned zones is set. When the object to be coated reaches the position, the exhaust volume of the first half zone is reduced, and at this time, the speed of reducing the air supply volume of the first half zone is controlled according to the direction of the horizontal airflow in the second half zone and the wind speed. , Zero displacement in the first half zone When became, by controlling the air supply amount of the first half zone, paint booth air flow control method characterized by stopping the airflow in the first half zone.