JPH0377663A - Coating booth - Google Patents

Abstract

PURPOSE:To improve the finish quality of coating by providing wall-shaped parts for guiding air current which extend downward respectively from both side ends of the transfer route of a placing table for materials to be coated when viewed in the transfer direction of the placing table. CONSTITUTION:A pair of the right and left wall-shaped parts 9 for guiding air current which extend downward respectively from both side ends of the transfer route of the placing table 7 when viewed in the transfer direction of the placing table 7 are provided. The ventilating air current flowing downward in the state of bypassing both lateral sides of the material A to be coated by being shielded by the material A is prevented from intruding to the lower space (a) of the placing table 7 by the shielding effect and guiding effect of the wall-shaped parts 9 and flows downward in the flow regulated state along the wall-shaped parts 9. Namely, the troubles, such as the stagnation of the suspended coating material mists occurring in the disturbance of the air current in the lower space (a) of the placing table and in the vicinity of the same to become the cause for the degradation of the finish quality of coating and the sticking and depositing of the suspended coating material mists on the placing table 7 and a conveyor 8, are prevented by providing wall-shaped parts 9.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a coating booth for spray painting objects to be coated such as automobile bodies. A ventilation system is installed to allow the fluid to flow.
The present invention relates to a coating booth in which a conveyor device for conveying the object to be coated, which transports the object to be coated in the spray painting work area, is disposed below a path for transferring the object to be coated.

[Conventional technology]

Conventionally, in the above-mentioned painting booth, as shown in Fig. 2, the lower space (a) of the mounting table (7) has both sides facing the spray painting work area (2) when viewed in the direction of transport of the mounting table. It was an open space.

[Problem to be solved by the invention]

However, under conditions where ventilation flows downward in the front of the spray painting work area (2), the lower space of the mounting table (as viewed from the direction of transport of the mounting table) has both sides open to the spray painting work area (2). a)
, airflow turbulence is likely to occur due to the object to be coated (A) blocking the downward ventilation airflow, and due to this airflow turbulence, floating paint may appear in the space below the mounting table (a) and its vicinity. Retention of the mist is promoted, and for this reason, the object to be coated (A
) may cause deterioration in the quality of the paint finish due to adhesion of the accumulated floating paint mist to the mounting table ( 7) and the conveyor device (8) may peel off after drying and re-adhere to the object to be coated (A), resulting in further deterioration of the quality of the paint finish. There is a problem in that the labor and expense required for maintenance such as cleaning and removing adhering and deposited paint on the device (8) increases.

An object of the present invention is to effectively solve the above-mentioned problems through rational structural improvements.

[Means to solve the problem]

The characteristic configuration of the painting booth according to the present invention is that a ventilation device is provided to provide downward ventilation in the front of the spray painting work area, and a conveyor device for transporting the workpieces is used to transport the workpiece mounting table in the spray painting work area. is disposed below the mounting table transfer path, and airflow guiding wall portions are provided that extend downward from the vicinity of both ends of the mounting table transfer path when viewed in the transfer direction of the workpiece placement table. , its actions and effects are as follows.

[For production]

In other words, with the above configuration (see Figure 1), the mounting table (7
), the object to be coated (A) is blocked by the object to be coated (A).
) The ventilation airflow flowing downward while bypassing both sides of the mounting table transfer path is caused by the blocking and guiding effects of the airflow guiding wall portions (9) extending downward from the vicinity of both ends of the transfer path of the mounting table. The mounting table (7) descends in a rectified state along the airflow guiding wall portion (9) while being prevented from entering the lower space (a).

〔Effect of the invention〕

As a result, it is possible to avoid the situation where the floating paint mist accumulates in the space below the mounting table and in its vicinity due to airflow turbulence, which is the case with conventional devices, and the accumulated floating paint mist is transferred to the object to be coated. The deterioration of the paint finish quality due to the adhesion of paint mist is effectively prevented, and the adhesion and accumulation of paint mist on the mounting table and conveyor device is almost completely prevented by the blocking effect of the air flow guide wall.

Layer 1. The airflow guiding wall is exposed to ventilation airflow containing paint mist, but this ventilation airflow descends in a rectified state due to the guiding action of the airflow guiding wall, so unlike conventional devices, the turbulence of the airflow causes the mounting table to Compared to the case where floating paint mist accumulates in the lower space and its vicinity, and the accumulated floating paint mist adheres and accumulates on the mounting table or conveyor device, it is far less likely that the paint mist will adhere to the airflow guide wall. Even if the paint deposited on the airflow guiding wall peels off after drying, the peeled paint will peel off along the airflow guiding wall due to the guiding action of the airflow guiding wall. The ventilation airflow flowing downward in a rectified state quickly removes the paint to the exhaust side, which is the downward direction, thereby preventing deterioration in the quality of the paint finish due to the deposited paint peeling off after drying and re-adhering to the object to be coated. The labor and expense required for maintenance such as cleaning and removing adhering paint can be greatly reduced.

In addition, when the coating booth is configured to include a pair of washing water lower pans that extend downwardly from the vicinity of the installation part of the conveyor device toward the outside of the circle when viewed in the direction of transfer of the mounting table, it is necessary to By adopting a configuration in which the lower end of the wall portion is arranged near the upper end of the cleaning water lower pan (the configuration according to claim 2), the airflow guiding function of the airflow guiding wall portion is transferred to the cleaning water lower pan. By allowing the ventilation air to flow further, the ventilation airflow can be further rectified.

Further, when viewed in the direction of transfer of the mounting table, the upper end of the airflow guide wall portion may be positioned inside the downwardly protruding lower edge of the lateral side of the object to be coated placed on the object mounting table. By descending along the lateral side of the object to be coated, the ventilation airflow that has reached the lateral lower edge of the object to be coated can generate a component force directed toward the outer painted surface of the lower lateral edge of the object. ,
This method has the advantage of maintaining high adhesion to the outer painted surface of the lower edge of the object to be coated.

〔Example〕

Next, an embodiment will be described based on FIG.

(1) is a tunnel-shaped painting booth, and the ceiling of the spray painting work area (2) inside the booth has a ceiling outlet (3) that blows ventilation air downward from almost the entire surface.
In addition, the floor is a lattice floor (4) that allows air to pass through the area, so that the air in the spray painting work area (2) is ventilated and flowed downward for efficient discharge of excess spray paint mist. be.

In the figure, (A) is the object to be coated (automobile body), (5) is the coating device that automatically operates the coating gun (5a), and below the grid floor (4) is the spray painting work area (2 ) is provided with a paint mist removal section (6) that separates and removes paint mist contained in the exhaust air from the exhaust air to purify the exhaust air.

The object to be coated (A) is placed on the mounting table (7).
7) and the spray painting work area (2) in the longitudinal direction of the booth.The conveyor system (8) that drives and transports the mounting table (7) is placed below the mounting table transfer path. The booth extends in the longitudinal direction.

(9) are a pair of left and right airflow guiding wall portions that extend downward from the vicinity of both ends of the mounting table transport path when viewed in the direction of transporting the mounting table (that is, viewed in the direction of transporting the object to be coated); A)
The ventilation airflow flowing downward while bypassing both sides of the object to be coated (A) is blocked by the airflow guide wall (9) and guided by the mounting table (7). ) is prevented from entering the lower space (a), and descends in a rectified state along the airflow guiding wall portion (9).

In other words, by providing the airflow guide wall portion (9) as described above, floating paint due to airflow turbulence in the space below the mounting table (a) and its vicinity, which causes a deterioration in the quality of the paint finish, can be prevented. This is to prevent inconveniences such as accumulation of mist and adhesion and accumulation of floating paint mist on the mounting table (7) and conveyor device (8).

In addition, since the ventilation airflow containing paint mist guided by the airflow guiding wall (9) descends in a rectified state along the airflow guiding wall (9), the lower space of the mounting table (7) a)
, and in the vicinity thereof, floating paint mist accumulates due to airflow turbulence, and the accumulated floating paint mist adheres to and accumulates on the mounting table (7) and conveyor device (8). The adhesion and accumulation of paint mist on (9) is much smaller.

The left and right airflow guide wall portions (9) extend in the longitudinal direction of the booth along the mounting table transfer path, respectively.

Further, in this example in which an automobile body is the object to be coated (A), the upper edge of the airflow guide wall portion (9) is attached to the automobile body (A).
) is placed inside the lower surface (P) of the side sill facing sideways downward, thereby further guiding the ventilation airflow flowing downward while bypassing the side of the vehicle body (A). This is to maintain good adhesion to the outer painted surface of the lower surface (P) of the downward facing side sill of the automobile body (A) while ensuring smooth coating.

On the other hand, in the paint mist removal section (6), there are a pair of left and right outer cleaning water flow down pans (10) extending downwardly from both side walls of the booth toward the center of the booth, and a conveyor device arranged in the center of the booth. A pair of left and right inner washing water flow lower pans (II) extending in a downwardly inclined state toward the outside of the circle is provided, and a lower end edge of the outer washing water flow lower pan (10) and an inner washing water flow are provided on each of the left and right sides. Lower bread (
11) is an exhaust port (12), and a bent flow path (I3) is provided which is connected to the exhaust port (12).

In other words, the air exhausted downward from the spray painting work area (2) merges with the washing water (W) from the outer washing water lowering pan (10) and the inner washing water lowering pan (11) into a bent flow. The paint mist in the exhaust air is captured by the cleaning water (W) during this passing process.

The cleaning water (W) that has captured the paint mist is sent to the lower tank (14).
After receiving the water, it is subjected to appropriate paint separation treatment and reused as washing water (W) to be supplied to the respective washing water flow pans (10) and (11).

Further, the exhaust air from which paint mist has been removed is forcibly exhausted by an exhaust fan (16) through a meandering exhaust route (R) in which a plurality of drain plates (15a), (15b), and (15c) are arranged in parallel.

In the figure, (17) is an overflow gutter for supplying wash water to the outer wash water lower pan (10), and (18) is an overflow gutter for supplying wash water to the inner wash water lower pan (11).

The left and right exhaust ports (12) are located closer to the center of the booth, and accordingly, the inner washing water flow down pan (11) is steeply sloped compared to the outer washing water flow down pan (10). In this arrangement, by arranging the lower end of the airflow guiding wall portion (9) near the upper end of the inner washing water flow lower pan (11), the airflow of the airflow guiding wall portion (9) is The guiding action is transferred to the inner washing water flow lower pan (11).

The lower end of the airflow guiding wall (9) and the inner washing water flow lower pan (
Between the upper end of 11) is an overflow gutter for supplying washing water (18).
An outflow port (19) is formed to allow the washing water (W) to flow out from the inner washing water flow down pan (11), and this outflow port (19) part is provided with an air outlet containing paint mist. An eaves portion (20) for preventing air from entering the conveyor device installation portion through the outlet (②9) is provided in a continuous manner from the lower end of the airflow guiding wall portion (9).

The left and right curved flow paths (13) through which the exhaust air and the cleaning water (W) pass through at high speed in a merged state have an exhaust direction outward from the left and right through the meandering exhaust route (R). The outlet ports (13a) of the curved channels (13) are each directed towards the center of the booth, and the outlet ports (13a) are opposite to each other.
A partition wall (21) is provided between them to prevent the discharged material from one discharge port (13a) from entering the meandering exhaust route (R) on the other side of the discharge destination. In the process of redirecting the discharged material from the discharge port (13a) in a U-turn from the discharge direction towards the center of the booth to the entrance direction of the meandering exhaust route towards the outside of the booth, the difference in discharge inertia between the wash water (W) and the exhaust air is detected. The exhaust air is drained and separated from the cleaning water (W) that has captured the paint mist.

At the tip of each curved plate (22) forming the bending path (13), there is an inclined part (23a) that slopes downward from the tip toward the outside of the booth, and from the lower end of the inclined part (23a) toward the center of the booth. The tip key portion (23) protrudes diagonally downward.
b) is provided with a diagonal-shaped drainage part (23), in which a part of the discharged cleaning water (W) containing paint mist becomes droplets at the tip of the curved plate (22) and flows into the exhaust air. The water cutter (23) at the tip of the curved plate prevents the water from entering the meandering exhaust route (R), and the splashed cleaning water (W) containing paint mist is disposed of outside the system along with the exhaust air. This can be prevented even more effectively by cooperating with the parallel drainage plates (15a), (15b), and (15c) in the meandering exhaust route (R).

In the figure, (24) is a sealing member that prevents paint mist from entering the inside of the conveyor device (8).

Furthermore, the conveyor device (8) has a bottomless case structure, so that even if paint mist enters the inside of the conveyor device (8) from the top, the intruding paint mist will be discharged downward from the bottomless portion. This is to prevent paint mist from building up inside the conveyor device.

[Another example]

Next, another example will be listed.

(a) The airflow guiding wall portion may be in a vertical position when viewed in the direction of transfer of the mounting table, or may be in a somewhat inclined position.

(b) The airflow guiding wall portion may have a curved shape when viewed in the direction of transfer of the mounting table.

(c) It may be determined as appropriate how far the airflow guide wall-shaped portion extends downward from the vicinity of both ends of the mounting table transfer path when viewed in the mounting table transfer direction.

(d) Various improvements can be made to the upper end structure and lower end structure of the airflow guiding wall portion.

(e) The object to be coated is not limited to automobile bodies.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention. FIG. 2 is a sectional view showing a conventional example. (2)... Spray painting work area, (7)...
・Placement table, (8)...Conveyor device, (9)・
... Air flow guide wall portion, (11) ... Cleaning water flow lower pan.

Claims (1)

[Claims] 1. A ventilation device is provided to ventilate and flow the air in the spray painting work area (2) downward, and
), in which a conveyor device (8) for conveying the object to be coated (8) for transporting the object to be coated (7) is disposed below the transfer path of the object to be coated, the object mounting table (7) A painting booth provided with airflow guiding wall portions (9) extending downward from near both ends of the mounting table transfer path when viewed in the transfer direction. 2. When viewed from the mounting table transfer direction, the conveyor device (8
A pair of wash water flow lower pans (11) are provided which extend in a downwardly sloping state from the vicinity of the disposed portion of the wash water flow lower pans (11) toward both outer sides, and the lower end of the airflow guiding wall portion (9) is connected to the lower end of the wash water flow lower pans (11).
2. The paint booth of claim 1, wherein the paint booth is located near the upper end of the paint booth. 3. When viewed from the mounting table transfer direction, the upper end of the airflow guide wall portion (9) is connected to the downward side sill portion of the object to be coated (A) placed on the object mounting table (7). Bottom surface (
3. The paint booth according to claim 1 or 2, wherein the paint booth is located inside the paint booth P).