JPH0761461B2 - 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. 5, 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, 8b are attached to 1a, 1b via air supply fans 7a, 7b, and exhaust fans 9a, 8b for paint mist separation chambers 2a, 2b.
9b is attached, and further, on the side wall of the paint booth 3,
A damper-like pressure adjusting device 10 ... Which adjusts the internal pressure is attached.

In this way, when the coating booth 3 is started, the opening / closing doors 6a and 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 door 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 each zone is provided in the air supply chamber. When controlling the speed of increasing or decreasing the amount of air supply by multiple air supply fans,
The rising increase amount of each air supply fan is made equal, and the falling increase amount is also made equal. Furthermore, in the same way, the same increase in rising amount and equal increase in falling amount are also applied to a plurality of exhaust fans provided in the exhaust chambers of each zone, so that a plurality of feeds has conventionally been used to increase the capacity. By providing an air fan and an exhaust fan, it is possible to easily control a large paint booth, which is difficult to control, and to prevent horizontal airflow between each zone. It is an object of the present invention to provide a method for controlling an air flow in a coating booth that can start and stop the paint.

(Means for Solving Problems) A feature of the present invention for achieving the above object is to divide a coating booth into a plurality of air supply chambers and exhaust chambers so as to face each other, and divide the zones into a plurality of zones. A plurality of air supply fans and exhaust air fans are provided in each of the chambers, the air supply amount and the exhaust amount of the first half zone of the zones are linearly increased to generate a vertical airflow, and then the coating is performed. When an object reaches a predetermined position in the first half zone, it increases the amount of exhaust by the plurality of exhaust fans in the second half zone so that the rising increase amount is controlled to be equal in the plurality of exhaust fans, and the horizontal air flow in the first half zone is also controlled. According to the direction of the wind and the wind speed, the amount of increase in air supply by the plurality of air supply fans in the latter half zone is controlled to be equal in the plurality of air supply fans, and the exhaust gas in the latter half zone is controlled by a predetermined amount. When it became The generation of air flow in the second half zone is set by making the air supply amount of the second half constant, and on the other hand, when the object to be coated reaches a predetermined position in the second half zone of the zone-separated zones, multiple exhaust fans in the first half zone are set. The amount of increase in the trailing edge that decreases the exhaust amount due to is controlled so as to be equal in the plurality of exhaust fans, and the plurality of air supply fans in the first half zone are adjusted according to the direction of the horizontal airflow in the latter half zone and the wind speed. The amount of increase in the trailing edge that decreases the supply air amount is controlled to be equal for the plurality of supply air fans, and when the exhaust amount in the first half zone becomes zero, the supply amount in the first half zone becomes constant. This is to stop the airflow in the first half zone.

(Operation) According to the air flow control method in the coating booth described above, when an object to be coated is coated in the coating booth, a plurality of air supply fans are provided for each air supply chamber and a plurality of exhaust air fans are provided for each air exhaust chamber. In a large paint booth as equipped, when increasing the air supply volume by a set of multiple air supply fans, keep the rising increase amount of each air supply fan equal and make another group. When increasing the exhaust volume with multiple exhaust fans,
The rising increase amount of each exhaust fan is maintained equal. Then, even when the supply air amount and the exhaust air amount are reduced by the supply air fans and the exhaust air fans, by making the falling increase amounts of the supply air fans and the exhaust fans equal, respectively. Then, without generating horizontal airflow between each zone in the large paint booth,
It is possible to start and stop each zone.

(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. 5, and the detailed description thereof will be omitted by giving the same reference numerals to the parts. First
The air supply chambers 1a and 1b separated by a partition plate 4 are located at the upper part of the coating booth 3 shown in the figure, and the exhaust chambers 2a and 2b are located at the lower part separated by a passage and face each other. Zones are formed for each of the air supply chambers 1a and 1b and the exhaust chambers 2a and 2b, and the side where the vehicle body 5 as the object to be coated enters is the first half zone 11a, and the side that exits is the second half zone 11b. Two air supply fans 7a, 7a and air supply fans 7b, 7b are connected to each of the air supply chambers 1a, 1b through ducts. And each air supply fan 7a, 7
Well-known air conditioners 8a and 8b are connected to a and the air supply fans 7b and 7b, respectively. Air supply fan control devices 12a, 12a for starting and stopping the rotation of the air supply fans 7a, 7a are electrically connected to the air supply fans 7a, 7a, and further, the air supply fan control devices 12a, 12a. In order to control the increase amount of rising and the increase amount of falling when increasing or decreasing the amount of air supplied by the air supply fans 7a, 7a equally in each air supply fan, The device 13a is electrically connected. Similarly, the air supply fans 7b, 7b are connected to the air supply fan control devices 12b, 12b, and further, the air supply speed control devices 13b are electrically connected from the air supply fan control devices 12b, 12b. There is. Each of the air supply speed control devices 13a and 13b is connected to the main control device 14, which will be described in detail later.

Two exhaust fans 9a and 9a and two exhaust fans 9b and 9b are connected to the exhaust chambers 2a and 2b at the lower part of the coating booth 3 through ducts corresponding to the air supply chambers 1a and 1b, respectively. . And
To each exhaust fan 9a, 9a, an exhaust fan control device 15a, 15a for starting and stopping the rotation of each exhaust fan 9a, 9a is electrically connected, and further to each exhaust fan control device 15a, 15a,
Exhaust speed control device for increasing / decreasing the amount of exhaust exhausted by the exhaust fans 9a, 9a so that the increasing amount of rising and the increasing amount of falling can be controlled equally in each exhaust fan.
16a is electrically connected. Similarly, the exhaust fan control devices 15b, 15b are connected to the respective exhaust fans 9b, 9b, and further, the exhaust speed control device 16b is electrically connected from the respective exhaust fan control devices 15b, 15b. . Each exhaust speed control device 16a, 16b is connected to the main control device.

As described above, the well-known wind speed detectors 17a and 17b are provided at substantially intermediate positions in the longitudinal direction between the first half zone 11a and the second half zone 11b.
However, they are attached to each of them and can detect the velocity of the horizontal airflow having the directionality generated in the first half zone 11a and the second half zone 11b. This each wind speed detector 17
Similarly, a and 17b are electrically connected to the main controller 14 via the wind speed detection circuit 18, and the detected values indicate that the first half zone 11
It is possible to control the air flow in a and the latter half zone 11b.

Although such control is performed by the main controller 14,
The schematic structure is shown in FIG.
Of these, parts related to the present invention will be described. this is,
Mainly consists of an input unit 20, a calculation unit 21 and a control unit 22,
In the input section 20, the air flow rate set values Qa of the air supply fans 7a, 7a and the exhaust air fans 9a, 9a of the first half zone 11a, and the air flow rate set values Qb of the air supply fans 7b, 7b and the exhaust air fans 9a, 9b of the second half zone 11b.
And the rising time set value t ₁ at startup of the air supply fans 7a, 7a and the air supply fans 7b, 7b arranged in the first half zone 11a and the second half zone 11b, and the first half zone 11a and the second half zone 1
Exhaust fans 9a, 9a and exhaust fan 9 arranged in 1b
The fall time set value t ₂ at the time of stop of b and 9b can be input by an input device (not shown).
In the calculation unit 21, according to each value input to the input unit 20, as shown below, the rising increase amount of the air supply fans 7a, 7a and the exhaust fans 9a, 9a in the first half zone 11a: q _a1 = Qa / t ₁ …… (1) Increase in the fall of air supply fans 7a, 7a and exhaust fans 9a, 9a in the first half zone 11a: q _a2 = Qa / t ₂ …… (2) Air supply fans 7b, 7b in the second half zone 11b And rise amount of exhaust fans 9b, 9b: _qb1 = Qb / t ₁ (3) Increase amount of fall of supply fans 7b, 7b and exhaust fans 9b, 9b in the latter half zone 11b: _qb2 = Qb / t ₂ (4) Each value is calculated. In the control unit 22, the air supply fans 7a, 7a, 7b, 7 of the first half zone 11a and the second half zone 11b.
For each rising speed q _a1 , q _b1 of b, the wind speed detectors 17a, 17a of the first half zone 11a and the second half zone 11b are passed through the wind speed detection circuit 18.
A correction value C is given according to the signal transmitted from b.
Therefore, at the time of startup, the air supply speed control device 13a connected to the air supply fans 7a, 7a of the first half zone 11a connected to the control unit 22 has the corrected rising of Cq _a1 from the equation (1). It is controlled by the increment. Further, the exhaust speed control device 16a connected to the exhaust fans 9a, 9a of the first half zone 11a is controlled by the rising increase amount which is not corrected by q _a1 from the equation (1). Then, the air supply speed control device 13b connected to the air supply fans 7b, 7b of the latter half zone 11b is (3)
From the equation, it is controlled by the corrected rising increase amount of Cq _b1 . Exhaust fan 9b, the exhaust speed controller 16b connected to 9b are by connexion control the rising increase not by connexion corrected q _b1 from the equation (3). On the other hand, when stopped, the first half zone
The air supply speed control device 13a connected to the air supply fans 7a, 7a of 11a is controlled by the corrected falling increase amount of Cq _a2 from the equation (2). The exhaust speed control device 16a connected to the exhaust fans 9a, 9a is controlled by the falling increase amount which is not corrected by q _a2 from the equation (2). The air supply fan 7b of the second half of zone 11b, air supply rate controller 13b connected to 7b are by connexion controlled (4) corrected falling increase in Cq _b2 from the equation, the exhaust fan 9b, 9b exhaust speed control device 16b are connected are by connexion controlled falling increment q _b2 not by connexion corrected to (4) to.

The car body 5 of the automobile, which is the object to be coated, is painted on the car body 5 while moving from the first half zone 11a to the second half zone 11b in the coating booth 3 having such a configuration. It is now being conducted.

Next, when the operation according to the air flow control method in the coating booth of the present invention is started using the coating booth 3 described above, FIG.
The case of stopping will be described with reference to FIG.

First, based on FIG. 3, the rising increase amount Cq calculated based on the air flow rate set values Qa, Qb set in the input unit 20 of the main control unit 14 before the first vehicle body 5 enters the first half zone 11a. _a1 and q _a1 Yotsute, the air supply fan 7a of the first half zones 11a, 7a and the exhaust fan 9a, half activates a 9a zone 11
Generate a vertical air flow of a. Then, the vehicle body 5 enters the first half zone 11a and is painted by a painting nozzle (not shown). Further, when the vehicle body 5 advances and reaches the point A of the first half zone 11a, the air supply fan 7 of the second half zone 11b is activated by the function (not shown) of the main controller 14.
A start command is issued to b, 7b and exhaust fans 9b, 9b via each air supply speed control device 13b and exhaust speed control device 16b. 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 amount of the exhaust fans 9b, 9b is increased by the rising increase amount _qb1 . The exhaust amount by the exhaust fans 9b, 9b is gradually increased, and is increased until the exhaust amount reaches the set value 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 fans 9b, 9b, but the wind speed detector 17a in the first half zone 11a detects the horizontal wind speed in the zone. If the detected wind speed value in the direction indicated by the arrow in FIG. 1 is smaller than the predetermined value C, the air supply fans 7b, 7b rotating at the predetermined rotation speed of the latter half zone 11b are detected. by operating the air supply speed control device 13b are connected gradually increased by connexion air charge to the rising increase Cq _b1. This is performed in a range where the airflow in the first half zone 11a does not cause horizontal movement in the second half zone 11b. When the increase of the air supply amount by the air supply fans 7b, 7b is accelerated and the wind speed value in the direction indicated by the arrow in FIG. 1 detected by the wind speed detector 17a of the first half zone 11a is larger than the value D. Because there is a risk that the airflow in the second half zone 11b will cause horizontal movement in the first half zone 11a, the air supply speed control device 13b connected to the air supply fans 7b, 7b is operated to increase the rising amount _qb1.
Slows down the increase in air supply. Then, when the exhaust amount by the exhaust fans 9b, 9b increases and reaches the set value B, the supply amount of the supply fans 7b, 7b becomes constant, and the continuous coating operation is performed.

Next, as shown in FIG. 4, the first half zone 11a and the second half zone 1
An explanation will be given of sequentially stopping the air flow for 1b. 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 of the latter half zone 11b, the main controller 14 causes the exhaust speed control device 1 of the first half zone 11a to operate.
A command to stop exhaust fans 9b and 9b is issued to 6a, and the fall increase amount q
_The displacement will be reduced by _a2 . The point E is an arbitrary point in the second half zone 11b in the traveling direction of the vehicle body 5, is related to the point A in the zone 11a, and is determined by the airflow state in both zones. Then, the exhaust amount by the exhaust fans 9b, 9b drops until it becomes zero. At this time, when the wind speed value in the arrow direction in FIG. 1 detected by the wind speed detector 17b in the latter half zone 11b is smaller than F. ,
Air supply speed control device 13a connected to the air supply fans 7a, 7a
Is activated to accelerate the decrease of the air supply amount by the falling amount q _a2 . This is performed within a range in which the horizontal movement of the airflow does not occur from the first half zone 11a to the second half zone 11b. Then, the wind speed value in the direction shown by the arrow in FIG. 1 detected by the wind speed detector 17b in the latter half zone 11b is increased by the decrease in the supply air amount by the air supply fans 7a, 7a being accelerated. Is larger than G, it is a dangerous value in which the horizontal movement of the airflow occurs from the second half zone 11b to the first half zone 11a. Therefore, the air supply speed control device 13a connected to the air supply fans 7a, 7a is operated. The rate of decrease in the air supply rate is slowed by the falling increase amount q _a2 . As a result, the amount of increase in falling that decreases the amount of air supply is delayed to push back the air flow in the latter half zone 11b. Then, when the exhaust amount by the exhaust fans 9a, 9a becomes zero, the supply amount of the supply fans 7a, 7a is made constant, painting is performed in the latter half zone 11b, and the vehicle body 5
When the vehicle goes out of the coating booth 3, the air supply fans 7a, 7a in the first half zone 11a and the air supply fans 7b, 7b and the exhaust fans 9b, 9b in the second half zone 11b are stopped.

In this way, even in a large paint booth equipped with a plurality of air supply fans 7a, 7a, 7b, 7b and exhaust fans 9a, 9a, 9b, 9b, start and stop are sequentially performed for each of the first half zone 11a and the second half zone 11b. The first half zone 11
The exchange of the air flow occurring at the boundary between a and the second half zone 11b is minimized.

In this embodiment, the inside of the coating booth 3 is in the first half zone 11a.
The second half zone 11b and the second half zone 11b have been described separately, but the same effect as described above can be obtained by dividing the latter half zone 11b into three or more places.

(Effects of the Invention) From the above description, in the coating booth airflow control method of the present invention, the coating booth is divided into zones in order to increase the volume of the airflow in the coating booth. With a fan and an exhaust fan, conventionally, a turbulent flow is easily generated by operating a plurality of air supply fans and an exhaust fan, and it is difficult to control the air flow. By equalizing the rising increase amount and the falling increase amount at the time of operation and making the rising increase amount and the fall increase amount at the time of operating a plurality of exhaust fans equal, Energy can be saved because a plurality of zones can be sequentially started and stopped without horizontally moving the airflow.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a coating booth used in the present invention, FIG. 2 is a configuration diagram showing a part of the configuration of a main control device, and FIG. 3 is a coating booth airflow control method of the present invention. Fig. 4 is a flow chart showing the start-up time, Fig. 4 is a flow chart showing the stop time of the paint booth airflow control method of the present invention, and Fig. 5 is a schematic view showing the paint booth used in the conventional operation method. Is. 1a, 1b: Air supply chamber, 2a, 2b: Exhaust chamber 3: Painting booth, 5: Object (car body) 7a, 7a, 7b, 7b: Air supply fan, 9a, 9a, 9b, 9b: Exhaust fan 11a : First half zone, 11b: Second half zone

Claims (1)

[Claims] 1. A coating booth is divided into zones in which a plurality of air supply chambers and exhaust chambers are opposed to each other, and a plurality of air supply fans and exhaust fans are provided in each of the air supply chambers and exhaust chambers. After the air supply amount and exhaust amount in the first half of the zones are linearly increased to generate a vertical air flow, when the object to be coated reaches a predetermined position in the first half zone, a plurality of exhaust fans in the second half zone are The rising increase amount that increases the exhaust amount due to is controlled by the plurality of exhaust fans so as to be equal, and is supplied by the plurality of air supply fans in the second half zone according to the direction of the horizontal airflow in the first half zone and the wind speed. The rising amount of increasing air volume is controlled to be equal in the plurality of air supply fans, and when the exhaust gas in the second half zone reaches a predetermined amount,
By setting the air supply amount in the second half zone to be constant, the generation of airflow in the second half zone is set, while when the object to be coated reaches a predetermined position in the second half zone among the zones divided into zones, multiple exhausts in the first half zone are set. The amount of increase in the trailing edge that reduces the exhaust volume due to the fans is controlled so as to be equal for the plurality of exhaust fans, and a plurality of air intakes in the first half zone are supplied according to the horizontal airflow direction and the wind speed in the latter half zone. The rising increase amount that decreases the air supply amount by the fan is controlled to be equal for the plurality of air supply fans, and when the exhaust amount in the first half zone becomes zero, the air supply amount in the first half zone becomes constant. A method for controlling an air flow in a coating booth, characterized in that the air flow in the first half zone is stopped by doing so.