JPH0580275B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides airflow control within a coating booth to allow air to flow through the coating booth when objects to be coated are sequentially moved into the coating booth and coated. Method.

(Prior art) Conventionally, when painting is performed while moving objects in a painting booth, there are multiple objects to be painted in a row, and each object is painted in such a way that they do not receive sprayed paint from each other. The inside of the booth has been devised. In particular, it is necessary to prevent fluctuations in the airflow that occur when starting and stopping the flow of necessary air to the object to be coated in the coating booth before starting and finishing the coating. A method for operating a painting booth disclosed in Japanese Patent Application Laid-open No. 165062/1983 is a method that takes measures to prevent this. As shown in FIG. 4, the coating booth used in this operating method is in the form of a tunnel, with air supply chambers 1a, 1b formed in the upper part and paint mist separation chambers 2a, 2b formed in the lower part. Inside the painting booth 3 and in the vertical direction of its entrance and exit,
Paint mist separation chambers 2a, 2 from air supply chambers 1a, 1b
Partition plates 4a, 4b, and 4c are formed across b, and each partition plate 4a, 4b, and 4c is provided with an opening/closing door that can be opened and closed so that a vehicle body 5 as an object to be painted can pass through. . And air supply room 1
Air conditioners 8a and 8b are attached to air supply fans 7a and 7b, and exhaust fans 9a and 9b are attached to the paint mist separation chambers 2a and 2b. A damper-like pressure adjustment device 10 is attached to adjust the internal pressure.

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

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

(Problems to be Solved by the Invention) The method for operating a painting booth described above is difficult to operate in actual use and requires a large number of parts, and requires further improvement.

Therefore, the present invention forms a zone between each air supply chamber and exhaust chamber in a painting booth formed by opposing the air supply chamber and exhaust chamber, and adjusts the wind speed of the horizontal airflow in each zone. Accordingly, the intake air amount and exhaust amount of each zone are controlled, and each zone is sequentially controlled without creating a horizontal airflow between each zone.
It is an object of the present invention to provide an airflow control method in a painting booth that can start and stop the generation of airflow.

(Means for Solving the Problems) A feature of the present invention for achieving the above object is that the air supply and exhaust chambers in the first half zone are divided into zones in which the air supply chamber and the exhaust chamber are opposed to each other in the painting booth. After starting the exhaust to create vertical airflow,
The exhaust volume in the second half zone is increased according to the position of the object to be coated in the first half zone, and the air supply volume in the second half zone is adjusted and increased according to the wind speed of the horizontal airflow in the first half zone. When the exhaust air in the second half zone reaches a predetermined amount, the generation of airflow in the second half zone is set by keeping the air supply amount in the second half zone constant; The exhaust volume in the first half zone is decreased according to the position of the object, and the air supply volume in the first half zone is adjusted and decreased according to the wind speed of the horizontal airflow in the second half zone, until the exhaust volume in the first half zone becomes zero. When this occurs, the air flow in the first half zone is stopped by keeping the air supply amount in the first half zone constant.

(Function) By the above airflow control method in the painting booth,
When painting the object to be painted in the painting booth,
Since there is no horizontal air flow in each zone where the workpiece is progressing, the workpieces being painted will not be sprayed with atomized paint from each other; Air supply and exhaust can be started and stopped to sequentially generate airflow up to

(Example) Examples of the present invention will be described below based on the drawings. FIG. 1 shows a coating booth 3 operated by the method for controlling airflow in a coating booth according to the present invention, and first, this configuration will be explained. This coating booth 3 has the same configuration as that already explained in the section of the prior art based on FIG. 4, and the same reference numerals are given to the same parts, and detailed explanation will be omitted.
Air supply chambers 1a and 1b separated by a partition plate 4 are located in the upper part of the painting booth 3 shown in FIG.
b is connected via a duct, and each air supply fan 7
Well-known temperature regulators 8a and 8b are connected to a and 7b. Each air supply fan 7a, 7b is provided with an air supply fan control device 1 to change the air supply volume.
2a and 12b are electrically connected, and from now on,
Furthermore, it is electrically connected to a main control device 13 that performs centralized control. In the lower part of the painting booth 3, exhaust chambers 2a and 2b are located which are divided in half like the upper part, and exhaust fans 9a and 9b are attached to each exhaust chamber 2a and 2b via ducts, and each exhaust Exhaust fan control devices 14a and 14b are attached to the fans 9a and 9b, and are electrically connected to the main control device 13 described above. There is a space between the above-mentioned air supply chambers 1a, 1b and exhaust chambers 2a, 2b, and each air supply chamber 1a, 1b and each exhaust chamber 2a, 2b are formed to face each other. Zones 11a and 11b are formed for each space. Well-known wind speed detectors 15a and 15b are attached to approximately the middle position in the longitudinal direction of each zone 11a and 11b.
It is possible to detect the velocity of the directional horizontal airflow generated within 1a and 11b. These wind speed detectors 15a, 15b are also electrically connected to the main controller 13, and can change the air supply amount and exhaust amount for each zone 11a, 1b depending on each detected value. . The car body 5, which is the object to be painted, moves through each zone 11a, 11b in the painting booth 3 having such a configuration, and the car body 5 is painted, so that different colors of paint are applied successively. It is starting to be done.

Next, as shown in FIG.
I will explain how to generate airflow in each case.

First, the first half air supply chambers 1a, 1b and exhaust chamber 2a,
2b, the main control device 13 causes the intake fan control device 12a and the exhaust fan control device 14a to start the intake fan 7a and the exhaust fan 9a. let Then, the vehicle body 5 enters the first zone 11a and is painted by a painting nozzle (not shown).
Furthermore, when the vehicle body 5 advances and reaches point A in the first half zone 11a, the main controller 13 controls the intake fan control device 12b and the exhaust fan control device 14b in the second half zone 11b to switch between the intake fan 7b and the exhaust fan 7b. A start command is issued to the fan 9b. Note that point A is an arbitrary point on the vehicle body 5 within the first half zone 11a, is related to the second half zone 11b, and is determined according to the state of airflow in both zones. In response to the above command, the exhaust fan 9b in the second half zone 11b rotates at a preset rotational increase speed in the exhaust fan control device 14b,
We will continue to increase its displacement. On the other hand, the air supply fan 7b in the second half zone 11b is on standby under the control of the air supply fan control device 12b. Then, the displacement by the exhaust fan 9b gradually increases until the displacement reaches the set value B.
This set value B is the exhaust fan 9 replaced with the displacement.
This can be controlled by the rotation speed of b. At this time, a part of the airflow in the first half zone 11a tries to move to the second half zone 11b by the exhaust fan 9b, but the wind speed detector 15 in the second half zone 11a
a detects the horizontal wind speed in that zone, and if the detected wind speed value in the direction shown by the arrow in FIG.
The amount of air supplied by the air supply fan 7b of 1b is increased. That is, the required amount of air supply is increased within a range that does not cause horizontal movement of the airflow in the first half zone 11a to the second half zone 11b. Air supply fan 7
The air supply amount due to b has increased, and the first half zone 11
If the detected wind speed value in the direction indicated by the arrow in FIG. The amount of air supplied by the fan 7b is reduced. By adjusting the amount of air supplied by the air supply fan 7b in this manner, generation of horizontal airflow in the first half zone 11a is prevented. Then, when the rotational speed of the exhaust fan 9b increases and its exhaust volume reaches the set value B, the air supply volume of the air supply fan 7b is maintained constant, and continuous operation of the painting process is performed. It can be done. next,
As shown in Figure 3, multiple first half and second half zones 1
An explanation will be given of stopping the airflow sequentially for each of 1a and 11b. First, when the final vehicle body 5 enters the second half zone 11b on the painting line, is painted, and reaches point E in the second half zone 11b, the main controller 13
A command is issued to the exhaust fan control device 14a to stop the exhaust fan 9a, and the exhaust fan control device 14
In step a, the displacement is decreased at a preset rotation reduction speed.

Note that point E is an arbitrary point in the direction in which the vehicle body 5 moves in the second half zone 11b, and
It is related to point A in 1a and determined by the airflow conditions in both zones. Then, the rotational speed is reduced until the exhaust amount by the exhaust fan 9a becomes zero, but at this time, the wind speed is detected by the wind speed detector 15b in the latter half zone 11b, and the wind speed is detected in the direction shown by the arrow in FIG. When the wind speed value is smaller than F, the amount of air supplied by the air supply fan 7a is reduced.
That is, the amount of air supplied by the air supply fan 7a is reduced within a range that does not cause horizontal movement of airflow in the latter half zone 11b. If the detected wind speed value in the direction indicated by the arrow in FIG.
Since this is a dangerous value that would cause horizontal movement toward 1a, the air flow in the latter half zone 11b is pushed back by increasing the amount of air supplied by the air supply fan 7a. By adjusting the air supply weight of the air supply fan 7a in this way, the second half zone 11b
This prevents horizontal airflow from occurring within the interior. Then, when the exhaust amount by the exhaust fan 9a becomes zero, the amount of air supplied by the air supply fan 7a is maintained constant, so that painting is performed in the second half zone 11b, and the vehicle body 5 is painted. When exiting from the booth 3, the air supply fan 7a and exhaust fan 9a in the first half zone 11a and the air supply fan 7b and exhaust fan 9b in the second half zone 11b are stopped.
In this way, when starting the first half zone 11a, then starting the second half zone 11b, and stopping it, first half zone 11a is stopped, then second half zone 11b is started, and then the second half zone 11b is started.
can be stopped. As a result, the first half zone 11a and the second half zone 11b can be sequentially started and stopped, so that unnecessary operation of the first half zone 11a and the second half zone 11b at the time of starting and stopping can be omitted.

(Effects of the Invention) As described above, in the method for controlling airflow in a painting booth of the present invention, an air supply chamber and an exhaust chamber are opposed to each other in the painting booth to form zones, and each zone has horizontal direction. To prevent the generation of air currents and adjust the air supply and exhaust air in adjacent painting operations without spraying each other with atomized paint. Furthermore, air supply and exhaust can be sequentially activated to generate airflow for each zone. On the other hand, they can be stopped sequentially. This saves energy, and the fact that the paint booth can be started and stopped sequentially eliminates the need to start and stop the entire coating booth at once, thereby reducing unnecessary operations. Additionally, parts such as opening/closing doors have been removed, making the structure simpler than before.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a painting booth used in the present invention, FIG. 2 is a flowchart showing a startup state of the method for controlling airflow in a painting booth according to the present invention, and FIG. 3 is a schematic diagram showing a coating booth used in the present invention. It is a flowchart which shows the state of a stop operation among the airflow control methods in a booth. Figure 4 shows
FIG. 1 is a schematic diagram showing a painting booth used in a conventional operating method. 1: Air supply room, 2: Exhaust room, 3: Painting booth,
5: object to be painted (vehicle body), 11a, 11b: zones (first half zone, second half zone), 15a, 15b: wind speed detector.

Claims (1)

[Scope of Claims] 1. After starting air supply and exhaust in the first half of the zone divided into zones with an air supply chamber and an exhaust chamber facing each other in the painting booth to generate a vertical airflow, Depending on the position of the object to be coated within the zone,
The exhaust volume in the second half zone is increased, and the air supply volume in the second half zone is increased while adjusting it according to the horizontal airflow speed in the first half zone. When the exhaust volume in the second half zone reaches a predetermined amount, the second half zone The generation of airflow in the second half zone is set by keeping the air supply amount in the zone constant, while the exhaust volume in the first half zone is reduced depending on the position of the object to be coated in the second half zone. Then, the air supply volume in the first half zone is adjusted and decreased according to the horizontal airflow speed in the second half zone, and when the exhaust volume in the first half zone reaches zero, the air supply volume in the first half zone is kept constant. A method for controlling airflow in a painting booth, characterized by stopping airflow in a first half zone by