JPH0425071B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a booth for spray painting automobile bodies, casings of home appliances, etc., and more particularly to ventilation equipment thereof.

[Conventional technology]

Conventionally, when configuring the ventilation equipment in the above-mentioned painting booth, as shown in Figs. A ceiling air outlet S ₁ is provided to supply air in the air to the floor 7 made of lattice.
By distributing exhaust ports 23 that discharge through almost the entire surface of the floor 7, and making the ventilation air flow as laminarly downward as possible throughout the entire area of the spray painting work area, excess air due to excessive flow can be removed. It suppresses the rising of spray paint mist and increases the ventilation effect, thereby reducing paint adhesion to painting equipment installed in the work area and improving maintenance.
In addition, consideration has been given to enabling efficient transfer and exchange of painted objects while quickly discharging floating paint mist and preventing color transfer due to residual paint mist between painted objects with different paint colors.

In the figure, A is the object to be painted, 8 is an articulated robot type automatic painting device equipped with a spray gun 8A, and 5 is a conveyor for transporting the object A to the spray painting work area.

[Problem that the invention seeks to solve]

However, in the conventional configuration described above,
As a result of various experiments, it was found that laminar flow of ventilation air downward over the entire area of the spray painting work area was effective in reducing the amount of excess air for the coating equipment 8, etc. located around the object to be painted A. Since ventilation air containing spray paint mist is sprayed from above,
Due to the spraying, a large amount of paint mist is deposited on the surrounding coating equipment 8, etc., and the deposited paint dries naturally and easily peels off due to vibration of the coating equipment 8 and ventilation airflow. It not only causes paint defects when it adheres to the painted surface of object A, but also causes failures in increasingly complex and sophisticated automatic painting equipment.To prevent these problems, cleaning and maintenance must be This required a great deal of frequency and time, and this also led to a decline in production efficiency.

The present invention makes it possible to effectively prevent paint from adhering to surrounding coating equipment, etc. of objects to be coated, while maintaining the function of quickly removing surplus spray paint mist, through rational improvements to ventilation gas flow. , it is possible to improve the coating efficiency of spray paint on the object to be painted, and the above-mentioned mist elimination function, paint adhesion prevention function, and coating efficiency improvement function regardless of the size or shape of the object to be painted. The goal is to be able to stably demonstrate each of the following.

[Means for solving problems]

The characteristic configuration of the painting booth according to the present invention is that, in the spray painting work area, the ceiling outlet blows out ventilation gas from almost the entire surface of the ceiling in a laminar flow in an almost vertically downward direction, and the ventilation gas flows from the side wall in an almost horizontal direction. A side wall outlet for blowing out air from the side wall outlet, and an exhaust port for discharging excess spray paint mist together with the gas in the area from below the object to be painted at the spray painting position, and an operating device for changing the amount of air blown from the side wall outlet. The functions and effects are as follows.

[Effect]

In other words, as shown in Figure 1, ventilation gas is blown out almost vertically downward from almost the entire surface of the ceiling,
Due to the merging effect with the ventilation gas blown out almost horizontally from the side wall and the exhaust action from below the object A, almost the entire amount of the supplied ventilation gas is transferred to the object A.
It is made to flow so that it is concentrated. (still,
In the figure, the gas flow state is represented by arrows. ) Therefore, due to the smooth flow of the combined ventilation gas to the exhaust port 23 side, excess spray paint mist floating in the spray painting work area can be quickly removed, and
Due to the horizontal blowout of the ventilation gas, the downward ventilation gas is deflected toward the object A to be painted, and the ventilation gas containing excess spray paint mist flows from above to the object A to be painted.
It is possible to avoid spraying onto the surrounding painting equipment 8, etc., and it is possible to effectively prevent paint from adhering to the surrounding painting equipment 8, etc.

Furthermore, by flowing the ventilation gas so as to concentrate it on the object A, no matter which direction the sprayed paint is sprayed on the object A, the sprayed paint will be backed up by the flow of the ventilation gas. It is also possible to spray paint onto the painted surface of workpiece A, and also to prevent excess spray paint mist generated from spraying from workpiece A to the space within the work area. This can be suppressed by the ventilation gas concentrated in the air, and these factors together can improve the application efficiency of spray paint.

Moreover, by making it possible to change the amount of air blown out from the side wall outlets S ₂ and S ₃ , the merging state of the downward ventilation gas and the horizontal ventilation gas can be adjusted by changing the amount of air blown out. Regardless of the size or change in shape of
The concentrated flow state of ventilation gas to the object A to be coated is
For example, as shown in FIGS. 5A and 5B, it has become possible to make appropriate changes and adjustments depending on the size and shape of the object A to be coated.

〔Effect of the invention〕

As a result of the above, continuous replacement of objects to be painted in the spray painting work area can be carried out as efficiently as before while preventing color transfer, and the overall continuous painting work efficiency can be maintained at a high level. be able to.

Moreover, the frequency and time required for cleaning and maintenance of peripheral devices can be greatly reduced, and it is also possible to reduce painting defects due to dust generated due to paint adhering to peripheral devices.

Furthermore, by improving the coating efficiency, it was possible to reduce wastage of paint during continuous coating work, and a reduction in coating costs was also achieved.

Furthermore, since the above-mentioned effects can be stably exhibited regardless of changes in the size or shape of the object to be coated, the versatility of the coating booth for different types of objects to be coated can be increased, and as a whole, it can be used for continuous coating work. We were able to provide a painting booth that is extremely suitable for

〔Example〕

Next, an example will be explained.

As shown in FIGS. 1 to 3, in a spray painting work area 1 formed in the shape of one chamber, a front wall 2,
A loading/unloading port 6 is formed on the rear wall 3 for loading and unloading the object A placed on the trolley 4 by the conveyor 5, and a spray gun 8A is provided on the floor 7 formed of a lattice member. An articulated robot-type automatic coating device 8 is arranged on both left and right sides of the conveyor 5 along the conveyance direction of the object to be coated, and the object to be coated is stopped at a predetermined position within the spray painting work area 1. A painting booth is configured in which object A is spray-painted by automatic operation of a painting device 8 based on a preset time schedule.

An air supply fan 9 is provided for supplying ventilation air into the painting work area 1, and an exhaust fan 10 is provided for discharging the air within the area together with excess spray paint mist through the lattice floor 7. ,10
Accordingly, the working area 1 is configured to be forcedly ventilated in order to eliminate excess spray paint mist. In the exhaust system path R for the exhaust fan 10, the cleaning water
A pan 11 that allows W ₁ to flow down along the upper surface to catch paint lumps from the floor 7 without sticking is arranged below the floor 7 so as to cover almost the entire surface of the floor 7. Exhaust pipes 12 having a slit-like opening shape in plan view are arranged in parallel to allow the overflowing cleaning water W ₁ to flow down along the inner peripheral surface to prevent paint mist from adhering to the exhaust gas while allowing exhaust gas to pass downward at high speed. As a result, as the gas discharged at high speed from the exhaust pipe line 12 collides with the water surface stored in the cleaning water tank 13 located below the pan 11, the paint mist in the exhaust gas is removed by utilizing the difference in inertial mass. is captured in the stored cleaning water _W1 ,
This constitutes a first mist removal device 14 that separates and removes paint mist from exhaust gas.
In addition, in the exhaust system path R downstream of the first mist removing device 14, the exhaust gas after large-diameter paint mist and paint lumps have been roughly removed by the first mist removing device 14 is flushed with overflowing cleaning water W. ₂ , the small-diameter paint mist is flowed down at high speed into the S-shaped bent pipe 15, and the accompanying centrifugal action takes advantage of the difference in inertial mass, similar to the first mist removal device 14, to clean the small-diameter paint mist. The second mist removal device 1 that is captured by ₂
It is equipped with 6.

To configure the ventilation structure for the painting work area 1, almost the entire surface of the ceiling 17 is covered with air that is pressurized and supplied from the air supply fan 9 to the upper chamber 18 via a filter 19 in a substantially vertically downward direction in a laminar flow shape. The ceiling air outlet S ₁ is formed to supply air into the area, and the left and right side walls 20A, 20B of the work area 1,
Then, the lower 1/3 to 2/3 of each of the front and rear walls 2 and 3, preferably the lower 1/2, is connected to the air supply fan 9.
A side wall outlet S ₂ made of a punched plate for supplying the air pressurized to the side chambers 21A, 21B and the front and rear chambers 21C, 21D through the filter 22 and blowing it horizontally and laminarly into the area. It is formed in S ₅ .

Then, the slit-shaped opening of the exhaust pipe 12 as the area air exhaust port 23 is arranged below the stopping position of the object to be painted A, so that the ventilation air from the ceiling air outlet S ₁ and the side wall air outlet S ₂ - By combining the ventilation air from S ₅ and discharging the combined air from the exhaust port 23 below the object to be coated almost in the direction of the combined flow, almost the entire amount of the supplied ventilation air can be delivered to the object to be coated. It is configured to flow in a state where it is concentrated in A. In other words, while the smooth concentrated flow of ventilation air toward the object to be painted quickly discharges surplus spray paint mist and improves coating efficiency, the ventilation air is directed downward by blowing out horizontally. Due to the biased flow toward the object A, ventilation air containing surplus spray paint mist from above is prevented from being sprayed onto the coating equipment 8 around the object to be painted, and the sprayed air is prevented from being sprayed onto the surrounding painting equipment 8. The structure is designed to prevent paint from adhering to the surface.

To construct each of the side wall outlets S ₂ to _{S 5} , as shown in FIG. A movable punching plate 25 is provided so as to be slidable by a stroke device 26, and both punching plates 24 and 25 are slid relative to each other by operating the stroke device 26, thereby changing the relative positions of the holes of the punching plates 24 and 25. By doing so, the substantial opening ratio of each of the side wall outlets S ₂ to _{S 5} is changed, thereby changing the horizontal blowout amount from each of the side wall outlets S ₂ to _{S 5} . A manually operated controller 27 is provided to separately control the amount of operation of the stroke device 26 for the air outlet S ₂ to _{S 5} , that is, the amount of displacement of each movable punching plate 25. By changing the horizontal blowout amount from the sidewall outlets S ₂ to _{S 5} and adjusting the merging state of the downward ventilation gas and the horizontal ventilation gas, the above-mentioned concentrated flow of ventilation gas to the object A to be coated can be achieved. The state of
It is constructed so that it can be adjusted appropriately as shown in Figures A and B.

[Another example]

Next, another example will be listed.

The side wall outlets S ₄ and S ₅ of the front wall 2 and rear wall 3 may be omitted.

To change the air volume of the side wall outlets S ₂ to _{S 5 ,} as _shown in FIG.
5', air supply fan 9 and side wall chamberers 21A, 21B, or front and rear chambers 21.
A damper for adjusting air volume may be installed in the duct connecting C and 21D, or a side wall outlet S ₂ to _{S 5} may be installed.
There are various specific devices for changing the air volume of the side wall outlets S ₂ to _{S 5} , such as using a dedicated air supply fan that can freely change the air blowing capacity by controlling the rotation speed and vane angle. The configuration can be changed, and these devices are collectively referred to as a blowout air volume changing device. Also, instead of changing the air volume of each side wall outlet S ₂ to S ₅ separately, the air volume of all the side wall outlets S ₂ to _{S 5} can be changed in an integrated manner. It may be configured.

Various improvements can be made to the specific structures of the ceiling outlet S ₁ and the side wall outlets S ₂ to _{S 5} .

[Brief explanation of drawings]

1 to 5 show embodiments of the present invention,
Fig. 1 is a longitudinal sectional view, Fig. 2 is a schematic plan view, Fig. 3 is a partially cutaway perspective view, Fig. 4 A and B are diagrams showing the operation structure and operation state for changing the blowout air volume, and Fig. 5 I. , b are schematic vertical cross-sectional views showing ventilation gas flow conditions, respectively. FIG. 6 is a longitudinal sectional view showing another embodiment of the present invention;
7 and 8 are a schematic vertical sectional view and a schematic plan view showing a conventional structure. 1... Spray painting work area, 23... Exhaust port, S ₁ ...
...Ceiling outlet, _S2 , _S5 ...Side wall outlet.

Claims (1)

[Claims] 1 In the spray painting work area 1, there is a ceiling outlet S ₁ that blows out ventilation gas almost vertically downward in a laminar flow from almost the entire surface of the ceiling, and a side wall outlet that blows out ventilation gas almost horizontally from the side wall. S ₂ to S ₅ and an exhaust port 23 that discharges excess spray paint mist along with the gas in the area from below the object A at the spray painting position.
and an operating device for changing the amount of air blown from the side wall outlets _S2 to _S5 .