JP3112582B2 - Automotive painting booth and drying booth - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile painting booth and a drying booth used for painting a car on a sheet metal. The coating powder dispersed in a room is guided under a floor to adsorb and remove powder in an air stream by water spray. A far-infrared radiator will be placed in the adjacent drying booth.

[0002]

2. Description of the Related Art In an automobile repair shop where a drying booth is also used as a painting booth, an airflow in which paint powder is dispersed is discharged to the outside by a discharge fan, but work is performed so that dirty air in the booth is not sucked in. Use a mask. After the completion of the coating process, the high-temperature airflow is circulated in the same booth by a high-temperature airflow generator using gas as a heat source to dry the automobile after coating. In this gas drying method, convection and conduction are mainly performed, and the coating film is dried from the surface toward the inside.
The radiation drying method using a far-infrared radiator is being used in some parts because of its good finish, but is not widely used because the rise time is inferior to that of the gas method.

[0003]

The air in which the paint powder is dispersed contains the organic solvent component of the paint, so that it is recommended that workers use a mask. It is. Since this air containing toxic components is released to the outside as it is, it causes environmental damage to the surroundings. The gas drying method has the advantage of low initial investment, but runs at a low cost and goes against energy saving. The alternating operation of painting and drying in the same booth has lower operating efficiency than the method of separating the painting booth and drying booth. The drying method, in which a number of far-infrared radiators are installed vertically, provides an excellent dry coating film because the absorption wavelength of the paint and the emission wavelength of the far-infrared radiator match, but convection loss from near the far-infrared radiator Is high.

[0004]

Means for Solving the Problems A spray space and an adjacent water storage tank are formed in the floor of a painting booth, and spray means for spraying a large amount of water into the spray space, and water sprayed in the water storage tank are sprayed. A pump for supplying the means, a filter for filtering the circulating water, and a discharge fan for guiding the air in the paint booth to the spray space and discharging it to the outside are arranged. Many infrared radiators are arranged. In order to minimize the convection loss from near the far-infrared radiator, a convection blocking plate is provided above the vertically installed far-infrared radiator.

[0005]

By the operation of the discharge fan, the airflow from the ceiling of the painting booth is forcibly sucked into the spraying space, passes through a part of the water storage tank, and is discharged to the outside (see the arrow in FIG. 2). A large amount of water is sprayed into the spray space by the spray means, and a kind of water screen is formed. The fine water droplets adsorb paint powder in the airflow passing through the spray space. The airflow emitted from the exhaust fan contains almost no paint powder. The fine water droplets settle at the bottom of the spray space, are filtered by a filter, and are guided to an adjacent water storage tank. The water in the water storage tank is returned to the spraying means by the pump. After completing the painting process, the car is transferred to the adjacent drying booth. The far-infrared radiator on the inner wall of the drying booth emits far-infrared rays that match the absorption of the coating film, and the coating film is quickly swiftly coupled with heat conduction in the already heated booth. dry. Fig. 4 shows the radiation characteristics of the far-infrared radiator.
The relationship between mullite, alumina, and zirconia is shown with respect to wavelength and emissivity (surface temperature is about 500 degrees). Generally, the absorption wavelength characteristic of the paint is in the band of 5 μm to 20 μm, and far infrared rays as shown in FIG. 4 are efficiently absorbed. Wavelength components not absorbed by the coating are only reflected or transmitted, and are not used for drying the coating. The absorbed far-infrared rays dry the coating film from the inside, so that a coating film that is superior to drying from the coating film surface due to conduction during gas drying is formed. The heated airflow near the far-infrared radiator is prevented from rising by the convection blocking plate, so that the convection loss is reduced.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A spray space 2 and an adjacent water tank 3 are formed in the floor of a coating booth 1 and a spray means for spraying a large amount of water into the spray space is arranged. As the spraying means, a horizontal pipe 4 having a plurality of spray nozzles is employed, and high-pressure water from a pump 5 in the water storage tank 3 is sprayed from the spray nozzles in four directions. As shown in FIG. 1, fine water droplets sprayed downward from the spray space 2 accumulate in the lower portion of the spray space 2 and reach the water storage tank 3. A filter 6 is disposed at the inlet of the water storage tank 3. Air filter 1 placed on the ceiling of painting booth 1
0. A discharge fan 11 is attached to the water tank 3 so that air flows sequentially through the spray booth room, the spray space 2, and the water tank 3. It is only necessary that the air in the painting booth is forcibly sucked into the spray space 2, and the installation place and the ventilation path of the discharge fan 11 are not limited to the water storage tank 3.

A drying booth 7 is located adjacent to the painting booth 1.
And a number of far-infrared radiators 8 made of ceramics such as mullite are vertically installed on the wall surface (FIG. 3). The far-infrared radiator 8 having a built-in heater emits far-infrared rays having a wavelength spectrum as shown in FIG. To minimize the convective loss of the far-infrared radiator 8 vertically installed on the wall of the drying booth 7, a convection blocking plate 9 such as a mirror-finished stainless plate is mounted on the upper portion of the far-infrared radiator 8 in multiple stages. . The tip of the convection blocking plate 9 is bent downward. Far infrared rays reflected by the convection blocking plate are directly or indirectly absorbed by the coating film. Since the entire drying booth 7 is made of a very thick heat insulating material, the inside of the booth can always be kept at a constant temperature, and there is no need to forcibly recirculate the air inside the booth unlike gas drying. The energy saving effect is high in combination with the adoption of the infrared radiation method. In the present embodiment, the far-infrared radiators 8 each having 1.2 KW are arranged in groups of eight, and two units are respectively disposed on the left and right wall surfaces. The radiation drying method basically does not require ventilation.

As described above, according to the present invention, the painting booth 1 and the drying booth 7 are separately provided, and the painting booth and the drying booth 7 are separately provided so that the painting and the drying of the automobile are independently performed, and continuity is obtained in both processes. It is a special feature. The drying booth 7 can always be kept at an elevated temperature, and excellent drying of the coating film by radiation and conduction can be performed in a short time, so that the working efficiency of continuous coating and drying is high.

[0009]

In short, according to the present invention, a spraying space 2 is formed in the floor of a coating booth 1 and a spraying means for spraying a large amount of water into the spraying space; 2, an exhaust fan 11 for discharging to the outside is provided, a drying booth 7 for drying a car finished in the painting booth is adjacent, a large number of far-infrared radiators 8 are arranged on the inner wall surface of the painting booth, and The installation of the convection blocking plate 9 above the vertically arranged far-infrared radiator frees the inefficiency of the conventional drying booth that also serves as a painting booth in an automobile repair shop, and allows painting without using a mask. It is possible to improve the working environment and to dry the coated film in a short time with a far-infrared radiator. Further, the far-infrared radiator 8 can be moved as appropriate in accordance with the drying location of the vehicle, and the energy-saving effect of this drying method, which mainly involves radiation and conduction, further improves the efficiency of continuous vehicle drying.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a painting booth and a drying booth adjacent thereto.

FIG. 2 is an explanatory sectional view of a painting booth.

FIG. 3 is a perspective view of a far-infrared radiator.

FIG. 4 is an emission spectrum diagram of a far-infrared radiator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Painting booth 2 Spray space 3 Water storage tank 4 Horizontal pipe 5 Pump 6 Filter 7 Drying booth 8 Far-infrared radiator 9 Convection prevention plate 10 Air filter 11 Discharge fan

Claims (1)

(57) [Claims] 1. A spraying space is formed in the floor of a coating booth 1 and spraying means for spraying a large amount of water into the spraying space, and all the dirty air in the coating booth is guided to the spraying space and discharged to the outside. And a drying booth 7 for drying the car finished in the painting booth, and a large number of far-infrared radiators 8 arranged on the inner wall surface of the drying booth 7. An automobile painting booth and a drying booth comprising a convection preventing plate 9 provided on an upper portion of a radiator 8.