JP2003181345A - Washing type coating booth using circulating water flow - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that a large amount of water is used in a washing coating chamber wherein coating mist is collected by a shower in order to enhance the collection efficiency of coating mist to be circulated to the water flow plate formed to the front of the coating chamber or a shower nozzle but sludge of captured coating particles floats to the surface of the water in a water tank and the treatment of this sludge brings about the lowering of workability and, further, a flowing sound of water becomes noise not only to deteriorate a work environment but also to obstruct work. <P>SOLUTION: The washing shower water in a mist treatment chamber is received by a trough and a part thereof is allowed to overflow to be adapted to the water flow plate while the remainder thereof is guided to the water tank provided to the font part of the coating chamber and allowed to outflow to be allowed to flow along the inclined surface continued to the treatment chamber to form the flow returned from a drain port to a rear water tank. By this constitution, sludge is collected in the rear water tank to facilitate maintenance. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating booth that sucks and collects paint mist scattered from a paint sprayed during spray coating without adhering to the object to be coated, and particularly to a paint booth using an exhaust fan. The present invention relates to a water-washing type coating booth that sucks mist together with an air stream, captures the paint mist with shower water, and discharges it as clean air.

[0002]

2. Description of the Related Art In a general water-washing type coating booth, a water tank 45 is arranged at the bottom as shown in FIG. 5, an exhaust fan 41 sucks a mist-containing airflow in front of the coating chamber, and passes through a mist processing chamber 43. At this time, the washing shower from the nozzle 44 is sprayed to drop the mist together with water into the lower water tank and is captured. The water sucked up by a pump (not shown) is supplied to the nozzle 44 and is provided in front of the coating chamber. The water is supplied to a gutter 46 that overflows the water plate 42. The water flow plate and the paint captured in the mist treatment chamber 43 provided at the rear of the water flow plate are dropped into a water tank and separated and collected as sludge for disposal.

In this type of coating booth, the mist of the paint that scatters is captured by contact with water. Therefore, the collection efficiency can be increased by increasing the chances of contact, and the cleaning of the exhausted air can be improved. It is possible to prevent air pollution and environmental pollution. In order to increase the contact between the mist and water, it is considered effective to increase the amount of water, increase the surface area of water, or the like, and generally use water droplets from a shower. In this case, the water droplets have a larger surface area as they become finer particles and the trapping effect can be enhanced with the same amount of water.

Further, the paint particles captured in the water droplets are returned to the water tank together with the shower water, and the paint particles are aggregated in a state of being separated from the water, and floated on the water surface as sludge to be collected. Normally, sludge floats on the entire surface of the aquarium, and its treatment is not easy as daily work.Therefore, in order to facilitate the collection of sludge, for example, a partition plate that creates a flow of shower drain so that it gathers in front of the aquarium is used. It is devised by arranging them. In addition, since the flow is directed to the water inlet of the pump, it is installed at a position where it can be easily treated, and a sludge recovery device is arranged.

In addition to the collection of paint mist by a shower, a general washing booth is also used by a water flow plate.
Usually, a water flow plate is provided on the front side facing the coating chamber, and water supplied to a gutter arranged above the water flow plate is overflowed by a pump to form a water film on the entire surface of the water flow plate.

The lower part of the water plate is between the water surface in the tank and
A suction port for the air flow to be sucked into the processing chamber is formed so that the overspray mist is effectively sucked and trapped in the processing chamber. Further, among the sprayed overspray particles, the coating particles that have gone straight ahead collide with this water film and fall into the water tank together with water, and are captured in the same manner as in the shower.

A problem with such a water-washing type coating booth is that the sludge recovery occupies most of the daily work, which causes a decrease in efficiency in the original painting work. In addition, since a large amount of water flows, there is a problem of sound caused by the water flow. That is, the sound of water flowing down the water plate, passing through the suction port, and falling on the water surface becomes noise, which causes a decrease in the working environment such as discomfort of the operator. Also, the sound of water falling from the washing shower in the processing chamber into the water tank is similar.

[0008]

[Problems to be Solved by the Invention] While maximizing the mist collecting effect, which is the basic function of a water-wash coating booth, the sludge generated as a result is not retained in the coating chamber, specifically, in the water tank. It is required to make it easier to collect and dispose of and to facilitate daily maintenance. Further, it is possible to prevent the generation of offensive odor due to the accumulation of sludge from the working environment as well, to reduce the noise caused by the water flow caused by the circulation of a large amount of water, and to obtain a coating room that is quieter and has a better working environment. It is an issue.

As described above, it is necessary to increase the amount of water in order to increase the collection efficiency of mist, but if it is increased, the noise also increases, and the collection efficiency can be improved without increasing the water amount. You will also need it.

[0010]

In order to solve these problems, the present invention draws paint mist from a suction port formed in a lower portion of a front panel of a coating chamber by a suction airflow by an exhaust fan and passes through the mist processing chamber. In the mist-containing air flow, from the water tank in the lower part of the coating room, in the water-washing type coating booth that sprays a washing shower supplied by a pump to capture the paint mist, arrange the front water tank and the rear water tank in the lower part of the coating room, A gutter for receiving washing shower water is provided in the mist treatment chamber, and a water conduit leading from the gutter to the front water tank is formed, and the rear edge of the front water tank is formed low to form a gentle downward slope toward the suction port. The feature is that they are connected to each other, and the overflow water of the front water tank is caused to flow to this inclined surface, and is returned to the rear water tank through the drain port formed at the lower portion of the inclined surface.

That is, the water in which the paint mist is captured in the treatment chamber flows into the trough, flows into the front water tank through the water conduit, flows on the inclined surface from the rear edge of the front water tank to the lower portion of the treatment chamber, and flows to the lower part of the treatment chamber. It does not stay until it is returned to the rear water tank from the drain port, and continues to flow relatively quickly, and after sludge is separated in the rear water tank, the shower nozzle in the treatment chamber and the front water plate overflow again by the pump. It forms a circulation path that is sent to the gutter.

In order to reduce the retention of sludge in the circulation path, the present invention provides water conduits on both sides of the front water tank. Further, the water collecting port provided in a part of the lower portion of the inclined surface and the pump suction port of the rear water tank are arranged at positions separated from each other to form a flow path.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of the coating room as seen from the side. The water tank 1 arranged at the lower part is divided into a front water tank 1A and a rear water tank 1B. A mist processing chamber 3 is provided at a substantially central portion, and an exhaust fan 4 is attached to the upper portion thereof. A gutter 5 is provided on the front surface of the processing chamber 3, and a water flow plate 6 is hung below the gutter 5. The water flow plate 6 is composed of an upper water flow plate 6A and a lower water flow plate 6B in consideration of ease of production and maintenance.

The lower water flow plate 6B is formed so that the suction port 7 is opened and the suction air flow of the exhaust fan 4 is sucked at an appropriate flow velocity. The mist processing chamber 3 serves as a passage for the air flow sucked by the exhaust fan 4, and an injection nozzle 8 for a washing shower is provided in an intermediate portion of the mist processing chamber 3 so as to inject the air toward the passing air flow. In the embodiment, a plurality of injection nozzles are arranged in the vertical direction, that is, in the left and right directions when viewed from the front of the coating chamber, and the shower water is sprayed over the entire area of the processing chamber.

The jetting direction is set obliquely along the guide plate 9. An eliminator 20 is provided for removing fine water droplets sucked by the exhaust fan 4 together with the flow of the air flow.

Another lower gutter 10 is provided at the tip of the washing shower jet direction, and like the water flow plate 6 (first stage water flow plate) in front of the processing chamber, a lower main flow plate 11 is attached as a second stage water flow plate. Has been. This lower gutter 10 is designed to overflow from the front, and receives the shower water,
The overflow water is configured to flow along the lower water flow plate 11. Further, drainage channels 12 are provided at both ends of the lower gutter 10. As shown in FIGS. 3 and 4, the drainage channel 12 is connected to the front water tank 1A via the water conduits 13 provided on both sides.

The front water tank 1A, to which a part of the shower water is supplied from the water conduit 13, rises to the bottom leaving a part of the front, forms an inclined floor surface 14 reaching the lower part of the processing chamber 3, and is fed into the water tank. Shower drain overflows and the slope 14
Configured to flow through. The sloping surface 14 is a gentle slope, and the lower water plate 1 has a lower end immersed in the water in the rear water tank 1B.
It reaches 1 and falls into the water tank 1B from the lower end of the inclined surface 14 which terminates immediately before that.

As another embodiment, in the example shown in FIG.
The end portion of the inclined surface 14 reaches the lower water flow plate 11, and flows along the lower end portion of the inclined surface 14 together with the flow water flowing from the lower water flow plate 11 as shown by the arrows in FIGS. 3 and 4. , Water is collected in the drain port 15 provided at the side end. Drain 15
Is provided on one end side of the inclined surface 14 and communicates with the rear water tank 1B. In this embodiment, the drain port 15 is provided at one end, but in this case, the suction part 16 of the pump provided in the rear water tank 1B is arranged at the other end on the opposite side so that the flow of water does not stagnant. ing. However, the water flow flows toward the water collecting port provided on one end side, and the suction portion 1 of the pump on the other end side
It is constructed so that the flow of water does not stagnant by returning to 6. It is important for this flow to create a flow on the surface of the water where the sludge floats, and if necessary, a flow path may be created by a partition plate to collect water.

In another example, drainage ports may be arranged at both ends, and the suction part of the pump may be arranged at the center of the rear water tank. In this case, it may be necessary to provide a partition in the central part so that there is no stagnation and to adjust the flow rate from the drainage port.

The width in the longitudinal direction of the lower water flow board 11 is set so as to sufficiently cover the width of the suction port, that is, the opening width in front of the coating chamber, and the lower end of the water flow reaches the surface of the water film flowing down the inclined surface. It is made to flow along the surface so that it does. Further, the space between the water flow plate 6 and the water flow plate 6 is set to a position as close as possible while ensuring a passage area for the air flow.

Further, it is advisable to remove any of the water flow plates or to open or close the water flow plates to facilitate the internal maintenance. In the embodiment, the lower water flow board is detachably hung on the lower gutter for overflow, and when removed, it blows through from the coating chamber side to the rear part. Therefore, it is easier to perform the work during maintenance.

[0022]

According to the present invention, the following effects can be obtained by the above-mentioned structure. According to the present invention, the collected paint particle sludge is collected in the rear water tank, which facilitates maintenance. Especially because it is located outside the rear of the painting room,
Sludge treatment and maintenance are possible even during painting work, and it is possible to operate without interrupting painting, corresponding to an automatic painting machine, leading to improved workability.

Further, since the drainage used in the washing shower for collecting mist is used for the lower water flow plate, the pumping amount of the pump can be reduced, resulting in energy saving and operating cost reduction. Furthermore, shower water is sent to the front aquarium, and by forming a water flow on the floor surface by overflow, the sludge flowing into the front aquarium can be sent to the rear aquarium at a high flow rate without increasing the amount of water. Sludge does not remain in the front water tank on the coating room side.

According to the present invention, even for noise, which was a problem during operation, the shower drainage is received by the internal gutter and returned to the water tank while forming a water film along the water flow plate, resulting in a quiet flow and overall Water flow noise is reduced because the amount of water can be reduced. In addition, the water flowing down from the front water flow plate is attracted by the sucked air flow and merges in a state where it is absorbed by the lower water flow plate and flows into the drain port, reducing the water splashing noise caused by conventional collisions and painting. The noise of the whole room can be reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a main part showing another embodiment of the present invention.

FIG. 3 is a plan view showing a lower water tank portion of another embodiment of the present invention.

FIG. 4 is a perspective view showing a lower water flow plate portion of another embodiment of the present invention.

FIG. 5 is a sectional structural view showing an example of a conventional coating booth.

[Explanation of symbols]

1, water tank (1A: front water tank, 1B: rear water tank) 3, mist processing room 6, water flow board 7, suction port 8, shower nozzle 10, lower gutter 11, lower water plate 12, drainage channel 13, headrace 14, inclined surface 15, drainage port

Claims (3)

[Claims] 1. A front water tank and a rear water tank are arranged at a lower portion of a coating chamber, and a paint mist is sucked from a suction port at a lower portion of a front panel of the coating chamber by a suction air flow of an exhaust fan to generate a mist-containing air flow passing through a mist treatment chamber. In a water-washing type coating booth that sprays a water-washing shower to capture paint mist, a trough for receiving the water for washing shower in the mist processing chamber is provided, and a water conduit leading from the gutter to the front water tank is formed, and at the rear of the front water tank. The rim is formed low and a gentle downward slope is formed toward the suction port to allow the overflow water of the front water tank to flow, and the water collection port formed at the lower part of the slope and the rear water tank are connected to the rear water tank. A water-washing type paint booth that is recirculated. 2. The water-washing type coating booth according to claim 1, wherein the water conduit is provided on both sides of a front water tank. 3. The water-washing type coating booth according to claim 2, wherein the water collecting port provided in a part of the lower portion of the inclined surface and the pump suction port of the rear water tank are arranged at positions separated from each other.