JPH0478352B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a coating method in which objects to be coated transported by a conveyor are sequentially coated in a plurality of coating zones provided in a supply coating booth.

[Conventional technology]

A large supply paint booth for car painting is
Automobile bodies that are continuously transported by a conveyor are passed from a painting preparation zone to an automatic painting zone, a setting zone, a hand-sprayed painting zone, and a setting zone in this order.

In other words, an automobile body being transferred within a painting booth completes preparation for painting in a painting preparation zone, moves to an automatic painting zone, and is automatically painted with a reciprocating painting device while moving within the automatic painting zone. After that, it moves to the setting zone, where the solvent is flushed out from the paint film and the coating condition is adjusted, and then it moves to the hand-sprayed painting zone, where correction painting is applied while moving within the hand-sprayed painting zone, and then the setting The solvent is flushed by moving to the cleaning zone.

[Problem that the invention seeks to solve]

However, when painting an automobile body with a total length of approximately 5 m while being continuously transported by a conveyor, each zone needs to be approximately 20 m long, so the total length of the painting booth is over 100 m. 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 painting booth and the supply and exhaust capacity of the air supply and exhaust fan become large, which significantly increases equipment costs and running costs. There was a problem.

Furthermore, when painting an object to be painted, such as an automobile body, while being transported by a conveyor, the surface of the paint becomes worse than when painting while the object is stopped, and automatic painting using a manipulator is extremely difficult. Ta.

Therefore, the present invention significantly reduces the installation space by shortening the overall length of the painting booth, and also reduces the capacity and power cost of the air conditioner and supply/exhaust fan that supplies clean air into the painting booth. The objective is to provide a coating method that can significantly reduce the equipment costs and running costs of the entire coating booth, and that also provides a very good coating surface, while also making automatic coating with a manipulator extremely easy. do.

[Means for solving problems]

To achieve this objective, the present invention provides a coating method in which objects to be coated transported by a conveyor are sequentially coated in a plurality of coating zones provided in a supply coating booth. The object to be coated is transferred into a supply coating booth by a conveyor that operates during the supply period, and when the object to be coated arrives at each coating zone in the coating booth, the conveyor is stopped and painted. During operation, the flow velocity of clean air supplied into the painting booth is lowered than normal.

[Effect]

According to the present invention, since the object to be coated is stopped and painted in each coating zone, the length of each coating zone is shortened to reduce the total length of the supply and coating booth, thereby saving the installation space of the coating booth. In addition, the coating surface of the coating film becomes extremely good, and automatic coating by a manipulator becomes easy.

In addition, while the conveyor that transfers the object to be coated is operating, the flow speed of clean air supplied into the painting booth is reduced, so the length of the painting booth can be shortened and the size of the painting booth can be reduced. Together, the capacity and power costs of air conditioners and supply/exhaust fans that supply clean air can be significantly reduced.

〔Example〕

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

In FIG. 1, a paint preparation zone 3 for preparing for painting and a manipulator 4 are provided in a supply painting booth 2 in which automobile bodies W are transferred by a floor conveyor 1 that operates intermittently at predetermined timings.
The first automatic painting zone 5 performs automatic painting by
a setting zone 6, a second automatic painting zone 9 where automatic painting is performed using a top reciprocating device 7 and a side reciprocating device 8, a setting zone 10,
A hand-blown painting zone 11 and a setting zone 12 are provided in which manual correction painting is performed, and the length of each zone is selected to be approximately 7 m, which is slightly longer than the length of the automobile body W.

Further, in the upper part of the painting booth 2, plenum chambers 13, 13, .
Air conditioners 14, 14 that supply clean air into 3...
... and air supply fans 15, 15... are provided.

Further, under the floor of the painting booth 2, exhaust processing chambers 16, 16, . . . are formed for each zone, and exhaust fans 17, 17, . ...is provided.

As a result, clean air is circulated at a wind speed of approximately 0.45 m/sec within the hand-blown painting zone 11 where manual correction painting is performed, and clean air is circulated within the other zones at a wind speed of approximately 0.3 m/sec. It is being distributed.

Note that since the air in the painting preparation zone 3 has a low degree of contamination, 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 painting booth shown in FIG. 1, and next, an example of a painting method using this will be explained.

First, the floor conveyor 1 is configured such that, for example, the time required for the conveyor 1 to transfer the car body W from each zone to the next zone in the painting booth 2 and the time required to paint the car body W are each 1 minute. If so, it is activated intermittently at a predetermined timing of activating for 1 minute and stopping for 1 minute.

During the one minute that the floor conveyor 1 is operating, the wind speed of the clean air flowing from each air conditioner 14, 14... through the plenum chambers 13, 13... in each zone is approximately the same as normal. Try to reduce it to one-third to one-fourth. In other words, since painting is not performed while the automobile body W is being transferred, the air supply fans 15, 1 are closed during this period.
At the same time, the air supply amount of 5... and the exhaust amount of exhaust fans 17, 17... are reduced, and at the same time, the air conditioners 14, 14...
The air conditioning capacity of... can be reduced, thereby significantly reducing running costs.

Floor conveyor 1 that operates intermittently as described above
The automobile body W to be transferred is transferred from the painting preparation zone 3 to the first automatic painting zone 5 by operating the floor conveyor 1 for 1 minute, and when it reaches the zone 5, the floor conveyor 1 is stopped for 1 minute. Automatic painting is then performed by the manipulator 4.

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

Also, during the one minute period during which this automatic painting is performed,
The wind speed of the clean air flowing into the automatic painting zone 5 is set to about 0.3 m/sec, which is the normal value, to prevent fogging caused by flying up paint mist and settling of dust.

When the manipulator 4 finishes painting after this one minute has passed, the paint mist in the automatic painting zone 5 will no longer fly up, so the wind speed of the clean air flowing into the zone 5 will be reduced to the normal speed (approximately 0.3 m/sec). Note that after painting is completed, it is sufficient to obtain a wind speed sufficient to prevent dust from settling, so the speed can be reduced to about 0.1 m/sec, which is one-third of the normal speed.

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

As a result, the automobile body W that has been painted in the previous automatic painting zone 5 is transferred to the next automatic painting zone 9.
A total of 3 minutes of flushing time is ensured between the transfer to the container and the start of painting. That is, since the time required for flushing the solvent is usually about 2 minutes and 30 seconds, the flushing is completed within this time.

Also, for one minute of the three-minute flushing time, the floor conveyor 1 is stopped and the car body
Since it is stopped in setting zone 6,
The length of the setting zone 6 can also be reduced to about one-third of the conventional length.

During this one minute period, the velocity of the clean air flowing into the setting zone 6 is returned to the normal value (approximately 0.3 m/sec) to promote flushing of the solvent, and at the same time 6
This prevents paint mist from entering from the automatic painting zones 5 and 9 adjacent to the automatic painting zones 5 and 9. When one minute has elapsed and the automobile body W starts to be transferred from the setting zone 6 to the second automatic painting zone 9, the wind speed of the clean air flowing into the setting zone 6 is increased to approximately 3 times the normal speed. Reduce it to 1/2.

Next, when the automobile body W whose paint film condition has been adjusted by flushing the solvent arrives at the automatic painting zone 9, the floor conveyor 1 is stopped for one minute, and the top reciprocating device 7 and the side reciprocating device 8 are automatically applied. Start painting.

In addition, during the one minute period during which this automatic painting is performed, the wind speed of the clean air flowing into the automatic painting zone 9 is returned to the normal value and set to approximately 0.3 m/sec to prevent paint mist from flying up. .

Then, after this one minute has passed, the reciprocating device 7
and 8, when the painting is completed, the automatic painting zone 9
Because there is no paint mist flying up inside,
The wind speed of the clean air flowing within the zone 9 is reduced again to about one-third of normal speed, and
The floor conveyor 1 is operated for 1 minute to transfer the car body W to the setting zone 10, and when the car body W reaches the setting zone 10, the floor conveyor 1 is stopped for 1 minute to remove the solvent from the coating film. cause flashing.

During this one minute period, the velocity of the clean air flowing into the zone 10 is returned to the normal value of approximately 0.3 m/sec, and the adjacent automatic painting zone 9
This prevents paint mist from entering from inside the hand-sprayed coating zone 11.

When one minute has elapsed, the velocity of the clean air flowing into the setting zone 10 is reduced to about one third of the normal speed, and the floor conveyor 1 is operated for one minute to adjust the coating film condition. The painted automobile body W is transferred to a hand-sprayed coating zone 11, and when the automobile body W arrives at the zone 11, the floor conveyor 1 is stopped for one minute and correction coating is performed.

In addition, during the 1 minute period during which this correction painting is performed, the wind speed of the clean air flowing in the hand-blown painting zone 11 is returned to the normal value of approximately 0.45 m/sec to prevent fogging due to the flying up of paint mist. To prevent this and at the same time maintain a good working environment for painting.

In this way, according to this example, the floor conveyor 1
The automobile body W, which is intermittently transferred at predetermined timing by
Painting is carried out while the setting zone is stopped for a certain period of time, and the solvent is flushed by stopping at each setting zone 6 and 10 for a certain period of time when being transferred from the previous coating zone to the next coating zone. Painting booth 2 with a significantly shorter length than before
The overall installation space can be significantly reduced, and by painting while the automobile body W is stopped, the coating surface of the paint film is extremely good, and automatic painting by the manipulator 4 is also facilitated.

In addition, since the overall length of the painting booth 2 can be shortened to make it more compact, the overall air conditioning capacity of the air conditioners 14, 14, the air supply capacity of the air supply fan 15, the air supply capacity of the exhaust fan 17, etc.
The exhaust capacity is small, and equipment costs and running costs are significantly reduced.

Furthermore, while the floor conveyor 1 is operating,
Since the wind speed of the clean air flowing in each zone is lower than normal, the power cost of the air conditioner 14, the air supply fan 15, and the exhaust fan 17 is significantly reduced, and the running cost is further reduced.

In addition, in FIG. 1, the case where the air conditioner 14, the air supply fan 15, and the exhaust fan 17 are provided for each zone has been described, but the present invention is not limited to this, and for example, as shown in FIG. 2 may be provided with one air conditioner 14 as a whole.

In addition, although setting zones 6 and 10 are provided between each painting zone in Figure 1, the setting zone between the painting zones is omitted as shown in Figure 2, and the object to be coated is set in the previous painting zone. Even after the painting is finished, the conveyor is stopped for a certain period of time in that painting zone to flush out the solvent, or the object to be painted that has been painted in the previous painting zone is immediately transferred to the next painting zone and transferred to the conveyor. The coating may be started after a certain period of time has elapsed after the solvent flushing is completed.

That is, in FIG. 2, clean air is supplied to the entire interior of the painting booth 2 from the air supply fan 15 of the air conditioner 14, and the interior of the painting booth 2 includes a painting preparation zone 3, an automatic Only a painting zone 9, a hand-sprayed painting zone 11, and a setting zone 12 are provided, and the automatic painting zone 9 and hand-sprayed painting zone 11 are directly connected to each other without a setting zone.

Further, the automobile body W is intermittently transported by a floor conveyor 1 that operates for one minute and stops for three minutes, for example.

When the painting of the car body W is completed in the automatic painting zone 9 at the previous stage, the floor conveyor 1 is operated for one minute to transfer the car body W to the hand-blown painting zone 11 at the next stage.

During this one minute, no painting is performed in either the automatic painting zone 9 or the hand-sprayed painting zone 11.
The wind speed of clean air flowing into the painting booth 2 is reduced to about one-third of the normal speed.

And the car body W is hand-blown painting zone 11
When the time comes, the floor conveyor 1 is stopped for 3 minutes, and when there is only 1 minute left in the stop time, the velocity of the clean air circulating in the coating booth 2 is returned to its normal value, and at the same time, the flushing of the solvent is stopped. Hand-blown correction painting is performed on the completed automobile body W.

When the 3-minute stop time 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 coating zone 11 to the setting zone 12, and the automobile body W is transferred to the setting zone 12. 12, the floor conveyor 1 is stopped for 3 minutes to completely flush out the solvent in the coating film.

In this way, not only the length of each zone is shortened, but also a setting zone is not required between coating zones 9 and 11, so that the total length of the coating booth 2 can be made even longer than in the case of FIG. As a result, the installation space is significantly reduced, and the equipment cost and running cost of the entire painting booth 2 are significantly reduced.

〔Effect of the invention〕

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 is good, and automatic coating with a manipulator is possible. This has the great effect of making it extremely easy.

In addition, the paint booth is made smaller, and the capacity of the air conditioner and air supply/exhaust fan that circulates clean air within the paint booth is also reduced, resulting in a significant reduction in equipment costs for the entire paint booth. There is.

Furthermore, while the conveyor is operating and the object to be coated is being transferred, the flow velocity of the clean air supplied into the coating booth is reduced, which saves power for the air conditioner and supply/exhaust fan. It also has the excellent effect of significantly reducing running costs.

[Brief explanation of the drawing]

FIGS. 1 and 2 are sectional views of a coating booth showing an example of the coating method according to the present invention. Explanation of symbols: W... Automobile body (object to be painted), 1... Floor conveyor, 2... Supply coating booth, 4... Manipulator, 5... Automatic painting zone, 7... Totsu pressurizing device, 8... ...Side reciprocating device, 9...Automatic painting zone, 11...
...Hand-sprayed painting zone, 14...Air conditioner, 15...
Supply air fan, 17...Exhaust fan.

Claims (1)

[Claims] 1. A coating method in which objects to be coated transported by a conveyor are sequentially coated in a plurality of coating zones provided in a supply coating booth, comprising: (a) operating intermittently at predetermined timings; (b) transporting the object to be coated into a supply coating booth by a conveyor, and when the object to be coated arrives at each coating zone in the coating booth, stopping said conveyor and coating; A painting method characterized in that while the painting booth is in operation, the flow velocity of clean air supplied into the painting booth is lowered than normal.