JPH0626698B2 - Painting method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a coating method for sequentially coating an object to be coated transferred by a conveyor in a plurality of coating zones provided in a coating booth.

[Conventional technology]

A coating booth for coating automobiles is configured to pass an automobile body, which is continuously transferred by a conveyor, in the order of a coating preparation zone, an automatic coating zone, a setting zone, a hand-blown coating zone, and a setting zone.

That is, the car body transferred in the paint booth is
After preparation for coating is completed in the coating preparation zone, the coating moves to the automatic coating zone.After moving inside the automatic coating zone, the reciprocating coating device automatically coats the coating. Is flushed, and after adjusting the condition of the coating film, it is moved to the hand-blown coating zone.After being corrected and coated while moving in the hand-blown coating zone, it is moved to the setting zone to flush the solvent. There is.

[Problems to be solved by the invention]

However, when coating a car body with a total length of about 5 m while being continuously transferred by a conveyor, the length of each zone needs to be about 20 m, so that the total length of the coating booth is 100 m or more. As a result, the installation space becomes very large, and at the same time, the air conditioning capacity of the air conditioner that supplies clean air into the coating booth and the air supply and exhaust capacity of the air supply and exhaust fan become large, resulting in a significant increase in equipment costs and running costs. was there.

In addition, when painting an object such as an automobile body while it is being transported by a conveyor, the coating surface will be worse than when painting with it stopped, and there is the problem that automatic painting with a manipulator is extremely difficult. It was

Therefore, the present invention reduces the total length of the coating booth to greatly reduce the installation space, and also reduces the capacity and power cost of the air conditioner and the supply / exhaust fan that supply clean air into the coating booth. It is an object of the present invention to provide a coating method capable of significantly reducing the total equipment cost and running cost, and moreover, the coating surface of the coating film is very good and at the same time automatic coating by a manipulator is extremely easy.

[Means for solving problems]

In order to achieve this object, the present invention, in a coating method for sequentially coating an object to be transferred by a conveyor in a plurality of coating zones provided in a coating booth, a conveyor that operates intermittently at a predetermined timing. The object to be coated is transferred to the coating booth by means of the above, and when the object to be coated arrives at each coating zone in the coating booth, the conveyor is stopped to perform coating, and the object to be coated is finished in the previous coating zone. During the period between the transfer to the next coating zone and the start of coating, the conveyor is stopped for a certain period of time to flush the solvent, and while the conveyor is operating to transfer the object to be coated, the coating is performed. By reducing the air supply / exhaust volume in the booth, the wind speed of the clean air that flows from the air conditioner through the plenum chamber into each zone of the paint booth will be lower than usual. And wherein the door.

[Action]

According to the present invention, since the object to be coated is stopped and coated in each coating zone, the length of each coating zone can be shortened, and the coating surface of the coating film becomes extremely good. Painting is also easy.

Further, the object to be coated, which has been coated in the coating zone in the previous stage, is flushed with the solvent in a state where it is stopped and stopped for a certain period of time from the completion of coating until it is transferred to the coating zone in the next stage and coating is started. Therefore, it is not necessary to provide a long setting zone between these coating zones as in the conventional case.

Therefore, the total length of the coating booth can be shortened and the installation space can be significantly reduced.

In addition, if the total length of the coating booth is shortened, the capacity of the air conditioner that supplies clean air to the coating booth and the capacity of the air supply and exhaust fans that supply and exhaust air inside the coating booth can be reduced.
The power cost can be reduced, and moreover, while the conveyor is operating and the object to be coated is being transferred, the amount of air supply and exhaust in the coating booth can be reduced and the cleaning air can be distributed in each zone of the coating booth. Since the wind speed of the air will be slower than usual,
The power cost of the air supply fan and the exhaust fan can be further reduced, and at the same time, the air conditioning capacity of the air conditioner can be reduced during that time, so the running cost of the air conditioner in addition to the air supply fan and the exhaust fan can be reduced. It can be significantly reduced.

〔Example〕

1 and 2 are sectional views of a coating booth showing an example of the coating method according to the present invention.

In FIG. 1, a coating preparation zone 3 for preparing a coating and an automatic coating by a manipulator 4 are prepared in a supply booth 2 for supplying an automobile body W by a floor conveyor 1 which operates intermittently at a predetermined timing. First automatic coating zone 5, setting zone 6, top reciprocating device 7 and side reciprocating device 8 second automatic coating zone 9 for performing automatic coating, setting zone 10,
A hand-blown coating zone 11 and a setting zone 12 for manually performing correction coating are provided, and the length of each of these zones is set to about 7 m, which is slightly longer than the vehicle length of the automobile body W.

Further, in the upper part of the coating booth 2, plenum chambers 13, 13 ... Divided for each zone are formed, and air conditioners 14, 14 ... For supplying clean air into the plenum chambers 13, respectively. Air supply fan 15,15 ...
... is provided.

Further, under the floor of the coating booth 2, exhaust processing chambers 16, 16 ... Are formed for each zone, and exhaust fans 17, 17 ... Which exhaust the air in each zone through the respective exhaust processing chambers 16 ... ... is provided.

As a result, clean air is normally circulated in the hand-blown coating zone 11 where manual correction coating is performed at a wind speed of approximately 0.45 m / sec, and clean air is normally circulated in the other zones at a wind speed of approximately 0.3 m / sec. Is made available for distribution.

Since the air in the coating preparation zone 3 is less contaminated, the air discharged from the exhaust treatment chamber 16 formed under the floor is circulated and supplied to the air conditioner 15 by the exhaust fan 17.

The above is the schematic configuration of the coating booth shown in FIG. 1. Next, an example of the coating method using the coating booth will be described.

First, in the floor conveyor 1, for example, the time required to transfer the vehicle body W from each zone in the coating booth 2 to the next zone by the conveyor 1 and the time required to coat the vehicle body W are 1 minute each. For example, it is operated intermittently at a predetermined timing such that it operates for 1 minute and stops for 1 minute.

Then, for one minute while the floor conveyor 1 is operating, the air conditioners 14, 14 ...
The wind speed of the clean air circulating in each zone through 3, 13 ... Is reduced to about one-third to one-fourth of the normal time. That is, since the painting is not performed during the transportation of the automobile body W, the air supply fan 1
It is possible to reduce the air supply amount of 5,15 ... and the exhaust amount of the exhaust fans 17, 17 ... At the same time, reduce the air conditioning capacity of the air conditioner 14, 14 ..., thereby significantly reducing the running cost. Is planned.

The vehicle body W transferred by the floor conveyor 1 which operates intermittently as described above is transferred from the coating preparation zone 3 to the first automatic coating zone 5 by operating the floor conveyor 1 for 1 minute, and then to the zone 5. When it arrives, the floor conveyor 1 is stopped for 1 minute, and automatic coating by the manipulator 4 is performed.

As a result, since the automobile body W is painted in a stopped state, the length of the automatic painting zone 5 can be shortened to about one-third of the conventional one, and the coating surface of the coating film becomes very good. The coating by the manipulator 4 can be performed very easily without requiring complicated control.

During the 1 minute during which this automatic coating is performed, the wind speed of the clean air flowing in the automatic coating zone 5 is set to the normal value of about 0.3 m / sec, and the fog caused by the rising of the paint mist is caused. The phenomenon and the settling of dust are prevented.

When the coating by the manipulator 4 is completed after the lapse of one minute, the paint mist does not rise up in the automatic coating zone 5, so that the wind speed of the clean air flowing in the zone 5 is set to a normal value (about 0.3). m / sec). It should be noted that it is sufficient to obtain a wind speed sufficient to prevent sedimentation of dust after the coating is completed, so one third of the normal time is required.
Can be reduced to about 0.1 m / sec.

When the coating by the manipulator 4 is completed, the floor conveyor 1 is operated for 1 minute to transfer the automobile body W from the automatic coating zone 5 to the setting zone 6, and when the automobile body W reaches the setting zone 6, the floor conveyor 1 is moved. Stop for 1 minute. Then, when this stop time has elapsed, the floor conveyor 1 is operated again for 1 minute to transfer the automobile body W in the setting zone 6 to the second coating zone 9.

As a result, a flushing time of 3 minutes is ensured until the automobile body W, which has been coated in the automatic coating zone 5 in the previous stage, is transferred to the automatic coating zone 9 in the next stage and coating is started. That is, since the time required for flushing the solvent is usually about 2 minutes and 30 seconds, flushing is completed during this period.

Further, since the floor conveyor 1 is stopped and the automobile body W is stopped in the setting zone 6 for one minute of the flushing time of three minutes, the length of the setting zone 6 can be about one-third of that of the conventional one. .

In addition, during this 1 minute, the wind speed of the clean air flowing in the setting zone 6 is the value at the normal time (about 0.3 m / sec).
To promote the flushing of the solvent and at the same time prevent the paint mist from entering from the automatic coating zones 5 and 9 adjacent to the setting zone 6. When one minute has elapsed and the automobile body W is started to be transferred from the setting zone 6 to the second automatic coating zone 9, the wind speed of the clean air flowing in the setting zone 6 is about 3 minutes of the normal time. Reduce to 1.

Next, when the automobile body W having the coating film condition adjusted by flushing the solvent arrives at the second automatic coating zone 9,
The floor conveyor 1 is stopped for 1 minute, and automatic painting by the top reciprocating device 7 and the side reciprocating device 8 is started.

It should be noted that, for one minute during which this automatic coating is performed, the wind speed of the clean air circulating in the automatic coating zone 9 is returned to the normal value and set to about 0.3 m / sec to prevent paint mist from flying up. .

When the coating by the reciprocating devices 7 and 8 is completed after the lapse of 1 minute, the paint mist does not rise in the automatic coating zone 9, so that the wind speed of the clean air circulated in the zone 9 is set to the normal level again. While lowering to about one-third of the time, the floor conveyor 1 is operated for 1 minute to transfer the automobile body W to the setting zone 10,
When the automobile body W reaches the setting zone 10, the floor conveyor 1 is stopped for 1 minute to flush the solvent from the coating film.

Also, during this 1 minute, the wind speed of the clean air flowing in the zone 10 is returned to the normal value of about 0.3 m / sec, and the adjacent automatic coating zone 9 and hand-blown coating zone 11 Prevents paint mist from entering.

Then, after one minute has passed, the setting zone 10
The wind speed of the clean air that is circulated inside is approximately one-third that of normal times.
And the floor conveyor 1 is operated for 1 minute to transfer the automobile body W with the coating film prepared to the hand-blown coating zone 11, and when the automobile body W arrives in the zone 11, the floor conveyor 1 is moved. Stop for 1 minute and perform correction coating.

In addition, one minute during this correction coating is in the hand-blown coating zone 1.
The wind speed of the clean air that is circulated in 1 is returned to the normal value of about 0.45 m / sec to prevent the fog phenomenon due to the rise of paint mist and at the same time maintain a good working environment for painting. .

Thus, according to this example, the vehicle body W is intermittently transferred by the floor conveyor 1 at a predetermined timing.
Is applied to each of the coating zones 5, 9 and 11 in a stopped state, and when it is transferred from the coating zone of the first stage to the coating zone of the next stage, it is stopped for a certain period of time in each of the setting zones 6 and 10 to remove the solvent. Since it will be flushed, the length of each of these zones will be much shorter than before and the coating booth 2
The total installation space can be significantly reduced.

Also, since painting is done with the car body W stopped,
The coating surface of the coating film becomes extremely good, and automatic coating by the manipulator 4 becomes easy.

Furthermore, since the overall length of the coating booth 2 can be shortened and downsized, the total air conditioning capacity, the air supply capacity of the air supply fan 15, the exhaust air capacity of the exhaust fan 17 can be small, and the equipment cost can be reduced. And running cost is greatly reduced.

Further, if the wind speed of the clean air flowing in each zone as in this example is reduced from the normal speed only while the floor conveyor 1 is operating, the power of the air conditioner 14, the air supply fan 15, and the exhaust fan 17 will be reduced. The cost is greatly reduced, and the running cost is further reduced.

In FIG. 1, the air conditioner 14 and the air supply fan 1 are shown.
5, the exhaust fan 17 is provided for each zone, but the present invention is not limited to this, and one air conditioner 14 may be provided for the entire coating booth 2 as shown in FIG.

Further, although the setting zones 6 and 10 are provided between the coating zones in FIG. 1, the present invention is not limited to this, and the second
As shown in the figure, the setting zone between the coating zones is omitted, and even after finishing the coating of the object to be coated in the previous coating zone, the conveyor is stopped for a certain period of time to perform solvent flushing, or It is also possible to immediately transfer the object to be coated, which has been coated in the coating zone in the previous stage, to the coating zone in the next stage, stop the conveyor, and start the coating after a lapse of a certain time when the flushing of the solvent is completed.

That is, in FIG. 2, clean air is supplied from the air supply fan 15 of the air conditioner 14 to the entire coating booth 2, and in the coating booth 2, the coating preparation zone 3, automatic Painting zone 9, hand-blown painting zone 11
Further, only the setting zone 12 is provided, and the automatic painting zone 9 and the hand-blown painting zone 11 are directly connected without passing through the setting zone.

The vehicle body W is intermittently transferred by, for example, the floor conveyor 1 that operates for 1 minute and stops for 3 minutes.

Then, when the painting of the automobile body W is completed in the automatic painting zone 9 in the previous stage, the floor conveyor 1 is operated for 1 minute to transfer the automobile body W to the hand-painted zone 11 in the next stage.

Since coating is not performed in either the automatic coating zone 9 or the hand-blown coating zone 11 for one minute, the wind speed of the clean air flowing in the coating booth 2 is reduced to about one-third of the normal time.

Then, when the automobile body W arrives at the hand-blown coating zone 11, the floor conveyor 1 is stopped for 3 minutes, and when the rest time is 1 minute, the wind speed of the clean air distributed in the coating booth 2 is normally set. At the same time as returning to the value of, the correction coating by hand spraying is applied to the automobile body W on which the solvent flushing is completed.

When the stop time of 3 minutes has elapsed, the floor conveyor 1 is operated for 1 minute to transfer the automobile body W that has been painted in the hand-blown painting zone 11 to the setting zone 12, and the automobile body W is set to the setting zone 12. When it arrives, the floor conveyor 1 is stopped for 3 minutes to completely flush the solvent in the coating film.

By doing so, not only the length of each zone is shortened but also the setting zone is not required between the coating zones 9 and 11, so that the total length of the coating booth 2 is shorter than that in the case of FIG. Therefore, the installation space is significantly reduced, and the equipment cost and running cost of the entire coating booth 2 are significantly reduced.

〔The invention's effect〕

As described above, according to the method of the present invention, it is possible to shorten the length of the coating booth and significantly reduce the installation space, and at the same time, the coating surface of the coating film becomes good, and automatic coating by the manipulator is also possible. It has a very excellent effect that it becomes extremely easy.

In addition, the length of the coating booth is shortened and downsized, and at the same time, while the conveyor that operates intermittently transfers the object to be coated, the amount of air supply and exhaust in the coating booth is reduced to reduce each zone of the coating booth. Since the wind speed of the clean air that flows in the interior is reduced, the capacity and power costs of the air conditioner and supply / exhaust fan that distribute the clean air in the coating booth are reduced, and the equipment costs and running costs are significantly reduced. There is also an excellent effect that you can do it.

[Brief description of drawings]

1 and 2 are sectional views of a coating booth showing an example of the coating method according to the present invention. Explanation of code W …… Automobile body (object to be coated), 1 …… Floor conveyor, 2 …… Air supply coating booth, 4 …… Manipulator,
5: Automatic coating zone, 7: Top reciprocating device, 8
...... Side reciprocating device, 9 ...... Automatic painting zone, 11
...... Hand blowing coating zone, 14 ...... air conditioner, 15 ...... air supply fan, 17 ...... exhaust fan.

Claims (1)

[Claims] 1. A coating method for sequentially coating an object to be coated transferred by a conveyor in a plurality of coating zones provided in a coating booth, comprising the steps of: a). The article to be coated (W) is transferred into the coating booth (2) by the conveyor (1) which is intermittently operated at a predetermined timing, and each coating zone (5, 5) in the coating booth (2) is transferred.
When the object to be coated (W) arrives at (9, 11), the conveyor (1) is stopped to perform coating, and the object to be coated (W) that has been coated in the previous coating zone is transferred to the next coating zone. The conveyor is stopped for a certain period of time between the transfer and the start of coating to flush the solvent, b). While the conveyor (1) is operating to transfer the object to be coated (1), the air supply / exhaust amount in the coating booth (2) is reduced, and the air conditioner (14) passes through the plenum chamber (13). Each zone (3,5,6,9,1) of the coating booth (2)
0,11,12) The coating method is characterized in that the wind speed of the clean air that is circulated in the air is reduced below that in normal times.