JPH01210069A - Coating booth - Google Patents

Abstract

PURPOSE:To efficiently discharge excess spray coating mist to a floor exhaust port and to further surely prevent color blushing by providing an exhaust port for forming an air flow wall having large suction air flow velocity in comparison with the floor exhaust port within the prescribed width compared from the floor exhaust port to the position opposite to an air outlet port for forming the air flow wall in the floor part of a coating operation zone. CONSTITUTION:Large quantities of ventilating air blown at high velocity through an outlet port 14 for forming an air flow wall are rectilinearly fluidized by the strong suction action of an exhaust port 16 for forming the air flow wall having large suction air flow velocity which is positioned opposite to the outlet port 14 and provided to the floor of a coating operation zone 2 and then discharged through the exhaust port 16. Thereby both the spread of the lateral air flow which inhibits elimination of excess spray coating mist caused by the passage of ventilating substance to a floor exhaust port 9 from a ceiling outlet port 7 and the inducing action for the circumferential air are effectively controlled. As a result, color blushing due to the excess spray coating mist can be surely prevented and high-quality spray coating can be performed for a material A to be coated which has been carried and contained in the coating operation zone 2.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a coating booth for spray painting various objects such as automobile bodies and casings of home appliances. In a painting work area where multiple objects to be coated that are transported in a parallel direction are accommodated for spray painting, there is a ceiling outlet that blows ventilation gas downward, and a floor exhaust that discharges the ventilation air along with excess spray paint mist. Each of the openings is provided along the conveyance path of the object to be coated to form an airflow wall for preventing paint mist transfer, which partitions the painting work area into a plurality of spray work zones corresponding to each of the objects to be stored and coated in the conveyance direction of the object to be coated. In order to Excess spray paint mist is quickly removed from the painting work area by ventilation gas flow from the air outlet to the floor exhaust outlet, and air flow walls prevent the transfer of surplus spray paint mist between spray work zones. The present invention relates to a painting booth that prevents so-called color fog, in which surplus spray paint mist of other colors adheres to objects to be painted.

[Conventional technology]

Conventionally, in the above-mentioned painting booth, the painting work area (2) is divided into a plurality of spray work zones (2), as shown in FIG.
The airflow wall (F) for preventing paint mist transfer that partitions into a) and (2b) was formed only by blowing out high-speed ventilation gas from the airflow wall forming outlet (14).

In the figure, (7) is a ceiling air outlet provided along the conveyance path of the object to be coated, and (9) is a floor exhaust port (lattice floor) also provided along the conveyance path of the object to be coated.

[Problem to be solved by the invention]

However, in the conventional painting booth as described above, the suction air velocity at the floor exhaust port (grid floor) provided along the conveyance path of the workpiece is uniform throughout the exhaust port, and the exhaust air from the painting work area is In order for this to occur uniformly in the direction of conveyance of the object to be coated, a large amount of ventilation gas for forming the airflow wall blown out at high speed from the outlet for forming the airflow wall will flow in the direction of conveyance of the object to be coated during the flow process within the painting work area. It spreads widely, creating a lateral airflow, and as it spreads, a large attracting effect is created that entrains the surrounding gas, including excess spray paint mist, into the airflow.As a result, the lateral airflow causes floor exhaust from the ceiling outlet. Elimination of surplus spray paint mist by ventilation gas flow to the mouth is obstructed, and due to the large attraction effect, surplus spray paint mist caught in the airflow for forming the airflow wall will spread to the adjacent spraying work zone as the airflow expands. It will be brought in,
For these reasons, the intended purpose of preventing color cast has not yet been fully achieved.

An object of the present invention is to more reliably prevent color cast caused by excess spray paint mist through rational improvements.

[Means to solve the problem]

A characteristic configuration of the painting booth according to the present invention is that in the painting work area where a plurality of objects to be coated, which are conveyed in a juxtaposed direction at predetermined intervals by a conveying device, are accommodated for spray painting, a ceiling outlet that blows ventilation gas downward is provided. , and a floor exhaust port for discharging the ventilation air together with surplus spray paint mist, are provided along the conveyance path of the objects to be coated, and the painting work area corresponds to each of the objects to be housed in the conveyance direction of the objects to be coated. An airflow wall forming blower blows out ventilation gas downward in a predetermined width at a speed higher than the ventilation gas blowing speed from the ceiling blowout port so as to form an airflow wall for preventing paint mist transfer that partitions into a plurality of spraying work zones. In the configuration in which the outlet is provided in the ceiling of the painting work area, an airflow wall forming exhaust port having a suction airflow velocity higher than that of the floor exhaust port within a predetermined width separated from the floor exhaust port is used for the painting work area. It is located at a position opposite to the airflow wall forming outlet on the floor of the area, and its operation and
The effects are as follows.

[For production]

In other words, with the above configuration, a large amount of ventilation gas blown out at high speed from the airflow wall forming outlet flows linearly due to the strong suction action of the airflow wall forming exhaust port located opposite to the airflow wall forming outlet. It is smoothly discharged from the exhaust port, thereby effectively suppressing the expansion of the airflow in the direction of conveyance of the object to be coated and the attraction effect on the surrounding gas.

〔Effect of the invention〕

As a result, the generation of sideways airflow that obstructs the removal of excess spray paint mist by ventilation gas distribution from the ceiling air outlet to the floor exhaust outlet is greatly suppressed, and excess spray paint mist is transferred from the painting work area to the floor exhaust outlet. It is now efficiently and smoothly discharged, and the entrainment of excess spray paint mist into the airflow for forming airflow walls, which causes transfer of surplus spray paint mist between spraying work zones, is effectively suppressed. The blocking effect of the airflow wall against excess sprayed paint mist has been improved, and because of these factors, excess sprayed paint can more reliably prevent color cast caused by paint mist than before, and can be used for multiple coats brought into and stored in the painting work area. It is now possible to apply even higher quality spray paint to each painted object.

〔Example〕

Next, an example will be described.

Figures 1 to 3 show a painting booth, with a painting work area (2) formed by a tunnel-shaped casing (1).
A conveyor (3) is installed in the painting work area (2) to carry in and out a plurality of objects to be coated (A) in a juxtaposed direction at predetermined intervals.
), automatic coating equipment (4) for spray painting each of the plurality of objects (A) carried into the container are arranged side by side along the object conveyance route.

The ceiling of the painting work area (2) has a ceiling outlet (7) that blows out ventilation air supplied from the air conditioner (5) to the air supply chamber (6) downward, while the floor has a perforated plate shape. The grid floor (8) serves as a floor exhaust port (9) for discharging surplus spray paint mist generated in the painting work area (2) together with ventilation air from the painting work area (2).

Further, below the grid floor (8), there is provided a processing device (10) for collecting paint mist discharged with ventilation air and paint slag falling from the painting work area (2).

In the figure, (11) is an air supply fan, and (12) is an exhaust fan.

The above-mentioned ceiling air outlet (7) and floor exhaust outlet (9) are arranged in parallel over almost the entire length of the painting work area (2) in the direction of conveyance of the object to be coated, but the painting work area (2) is connected to the air flow wall (F). It is partitioned into a plurality of spraying work zones (2a) and (2b) corresponding to each of the stored objects (A) in the direction of conveyance of the objects to be coated, and a ceiling air outlet (7) and a floor exhaust outlet ( 9
) are arranged in parallel in the conveyance direction of the object to be coated, with respective positions corresponding to the spraying work zones (2a) and (2b).

In other words, in the individual spraying work zones (2a) and (2b) in the painting work area (2), excess spray paint mist is quickly removed by ventilation air circulation from the ceiling outlet (7) to the floor exhaust outlet (9). In addition, the air flow wall (F) prevents the transfer of excess spray paint mist between the spray work zones (2a) and (2b), thereby reducing the color difference between the objects (A) with different paint colors. This is to prevent fogging.

The configuration for forming the airflow wall includes a spraying work zone (2a) in the ceiling of the painting work area (2).

(2b) between the ceiling air outlets (7) corresponding to each of the ceiling air outlets (7).
6) is an air flow wall forming outlet (14) with a separate air supply chamber (13) separated from the other wall, and supplies ventilation air to the air supply chamber (6) of the other ceiling outlet (7). In addition to the air supply fan (11), a dedicated air supply fan (15) is provided to supply ventilation air to the air supply chamber (13) of the airflow wall forming outlet (14). Depending on the air composition, the spraying work zone (2a),
(2b) Forming an airflow wall at a blowing speed that is higher than the ventilation air blowing speed from the airflow wall forming airflow outlet (14) to the other ceiling airflow outlets (7) in a boundary area (X) of a predetermined width between the airflow walls. The ventilating air is blown out downward.

On the other hand, in the floor of the painting work area (2), a part of a predetermined width of the continuous lattice floor (8) located opposite to the airflow wall forming outlet (14) is connected to another floor exhaust outlet ( 9) is an airflow wall forming exhaust port (16) separated from the airflow wall forming exhaust port (16), so that a separate exhaust path is provided below that part, which is separated from the exhaust path from other floor exhaust ports (9). Dedicated processing equipment (1
7), and an airflow wall forming exhaust port (16) separately from the exhaust fan (12) for the other floor exhaust port (9).
A dedicated exhaust fan (18) is provided to take in air from the spraying work zone (2a).
).

(2b) Suction and exhaust action of the airflow wall forming exhaust port (16) with respect to the boundary area (X) between them at a suction airflow velocity that is higher than the suction flow velocity of the other floor exhaust ports (9). It's like letting them do it.

In other words, as described above, high-speed ventilation air is blown out from the airflow wall forming outlet (14), and the airflow wall forming outlet (14) is
4) The airflow wall forming exhaust port (16
), the spraying work zone (2a)
, (2b) In the boundary area (X) of a predetermined width between them,
The blowing ventilation air flows straight and smoothly at high speed toward the airflow wall forming exhaust port (16) to reach the spraying work zone (
2a), (2b) spraying work zone (2a), without adversely affecting paint mist discharge due to ventilation air circulation from ceiling outlet (7) to floor exhaust outlet (9), respectively.
(2b) to form an airflow wall (F) that can reliably prevent paint mist transfer between the two spaces.

Note that the airflow wall forming outlet (14) is connected to the other ceiling outlet (7).
), it is formed by overlapping a filter (19) and a perforated plate (20), and also has an airflow wall forming outlet (
The amount of air blown out from 14) and the amount of suction and exhaust from the airflow wall forming exhaust port (16) are set to be almost the same, thereby making the airflow forming the airflow wall (F) as laminar as possible. As a similar example, the above-mentioned spraying work zone (2a),
(2b) The ventilation air circulation in each area should not have an adverse effect on paint mist discharge, and the spraying work zone (2a),
(2b) This makes it possible to more effectively achieve both the reliably prevention of paint mist transfer between the parts.

[Another example]

Next, another example will be listed.

(a) Various improvements can be made to the specific formation structure of the airflow wall forming outlet and the airflow wall forming exhaust port, as well as the chamber structure for these outlets and exhaust ports.

(El) As shown in Fig. 4, the supply air path (
21) are connected in a branch manner, and the air flow rate adjusting means (22) and (23) interposed in the branch air passage allow the air flow wall forming outlet (
The ventilation gas blowing speed of 14) may be made higher than the ventilation gas blowing speed of the other ceiling air outlets (7), and
Similarly, on the exhaust side, the airflow wall forming exhaust port (16)
An exhaust air passage (24) is branched and connected to the other floor exhaust port (9), and an air volume adjustment means (25) is installed in the branch air passage.
, (26), the suction airflow velocity of the airflow wall forming exhaust port (16) may be made higher than the suction airflow velocity of the other floor exhaust ports (9).

(c) How much higher should the ventilation gas blowing speed of the airflow wall forming outlet be than the ventilation gas blowing speed of other ceiling airflow outlets, and how much should the suction airflow velocity of the airflow wall forming outlet be How much higher the suction airflow velocity should be than the floor exhaust port can be determined as appropriate. For example, while the airflow velocity of the ventilation gas in the spraying work zone is about 0.5n+/s, the airflow velocity at the airflow wall is about 0.5n+/s. Each blowing speed and each suction airflow speed may be determined using a speed of 1.0 m8 as a guideline.

(f) The blowing out of ventilation gas from the airflow wall forming outlet and the suction of ventilation gas from the airflow wall forming outlet located opposite to it may be the same (for example, see Figure 4). They may be different from each other as shown in .

(f) As for the method of conveying the object to be coated, it may be possible to spray paint the object in a stationary state after transporting the object, or it may be a method in which the object to be coated is spray coated without being transported. .

(g) The type of object to be painted does not matter.

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 the drawing]

1 to 3 show embodiments of the present invention, FIG. 1 is a side sectional view, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a planar sectional view. . FIG. 4 is a side sectional view showing another embodiment of the present invention, and FIG. 5 is a side sectional view showing a conventional example. (2)...Painting work area, (2a), (2b
)... Spraying work zone, (3)... Transfer device, (7)... Ceiling outlet, (9)...
...Floor exhaust port, (14)...Blowout port for forming airflow wall, (16)...Blowout port for forming airflow wall, (A
)......Object to be coated, (F)...Airflow wall, (
8), (20)... Porous plate-like body.

Claims (1)

[Claims] 1. In the coating work area (2) where a plurality of objects to be coated (A), which are conveyed in a juxtaposed direction at predetermined intervals by a conveyance device (3), are accommodated for spray coating, ventilation gas is supplied. A ceiling outlet (7) that blows out downward and a floor exhaust outlet (9) that discharges the ventilation air together with surplus spray paint mist are provided along the conveyance path of the object to be coated, and the painting work area (2) is The air flow wall (F) for preventing paint mist transfer is formed so as to form an airflow wall (F) for preventing paint mist transfer, which partitions the paint mist transfer prevention airflow wall (F) into a plurality of spraying work zones (2a), (2b) corresponding to each of the accommodated objects (A) in the object conveyance direction. An airflow wall forming outlet (14) that blows out ventilation gas downward in a predetermined width at a speed higher than the ventilation gas blowout speed from the ceiling outlet (7) is provided in the ceiling of the painting work area (2). In the painting booth, an airflow wall forming exhaust port (16) having a suction airflow velocity higher than that of the floor exhaust port (9) within a predetermined width separated from the floor exhaust port (9) is used for the painting booth. The air flow wall forming outlet (14) is installed on the floor of the work area (2).
Painting booth located opposite the. 2. The opening surface of each of the airflow wall forming outlet (14) and the airflow wall forming exhaust port (16) is a porous plate-shaped body (20).
, (8). . . . (8). 3. The coating according to claim 1 or 2, wherein the volume of ventilation gas blown from the airflow wall forming outlet (14) and the suction/exhaust air volume from the airflow wall forming exhaust port (16) are set to be approximately equal. booth.