JP3589009B2 - painting booth - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a coating booth, and more particularly, to a structure of a coating booth for collecting paint splashes generated when performing spray coating or the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a coating booth has been used for collecting paint splashes generated when performing spray coating or the like. This coating booth has a filter type that catches paint splashes with a filter etc., for example, it is configured to form a water flow film by flowing water behind the coating area, and to take paint splashes into the water flow film There is also used a type that includes a paint intake unit that has been used and a sludge collection unit that collects water that has taken up the paint to collect sludge composed of paint components.
[0003]
FIG. 5 shows an example of a conventional painting booth of the type described above. In this coating booth, an inclined surface 11 is formed below the coating area 10, and a water flow is generated by supplying water from a water supply tank 12 on the inclined surface 11, and this water flow is collected below. It is configured to lead to the tank 13. The water stored in the recovery tank 13 is returned to the water supply tank 12 by the water supply pump 14 again. In the coating area, the paint is sprayed downward onto a work (not shown) by a spray gun (not shown), and paint splashes not adhered to the object are taken into a water flow film formed on the inclined surface 11. And collected in the collection tank 13. This type of painting booth has a higher paint splashing efficiency than a painting booth using a filter, does not cause clogging of the filter, and eliminates the need for filter replacement. There is an advantage that there is no need to provide a backwashing device or the like for eliminating clogging.
[0004]
[Problems to be solved by the invention]
However, in the above-mentioned conventional coating booth, since it is necessary to uniformly flow the water flow on the inclined surface 11 disposed below the coating area 10, it is necessary to flow a large amount of water on the inclined surface, and the inclined surface 11 Due to the configuration, the volume of the paint splash intake section becomes large, and the water circulation system, the exhaust, and the recovery device also become large, so that the volume of the entire device also becomes large. Further, since a large amount of water is used, there is a problem that even if a circulation system is provided, many complicated mechanisms are required for water decay and sludge recovery, and a large capital investment is required.
[0005]
Therefore, the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a coating booth of a type in which paint splashes are taken into a liquid. Is to provide.
[0006]
[Means for Solving the Problems]
Means taken by the present invention in order to solve the above problems, an overflow tank provided below the coating area and having an overflow portion on the upper peripheral edge, a liquid supply means for supplying liquid to the overflow tank, A collecting tank for receiving and collecting the liquid overflowing from the overflow tank, wherein the liquid supplied by the liquid supply means is introduced from the inside of the overflow tank, and the liquid supplied to the overflow tank is This painting booth is characterized by catching paint splashes on the liquid surface.
[0007]
According to this means, since the paint droplets are captured by the liquid surface of the overflow tank, the liquid that has captured the paint droplets overflows from the overflow section, and is collected in the recovery tank. Compared to a booth, the structure is simpler, and there is no need to take measures such as uniformly flowing the liquid on the inclined surface to catch paint splashes, so the flow rate of the liquid can be reduced, paint splash catching parts and liquid circulation Since each system can be made compact, the size of the entire apparatus can be reduced.
[0008]
Here, it is preferable that the overflow section of the overflow tank be provided with a notch formed lower than the surroundings. According to this means, the liquid can be easily caused to overflow by the notch and the liquid can overflow only from the notch forming a part of the overflow of the overflow tank. It can be set to the minimum required.
[0009]
Further, it is preferable that a difference in surface angle between ridge lines of the overflow portion of the overflow tank is smaller than 90 degrees. According to this means, since the surface angle difference of the ridge line of the overflow portion is smaller than 90 degrees, the effect of the surface tension of the liquid can be reduced, and the minimum amount of overflow of the liquid can be further reduced. Therefore, the lower limit of the adjustment range of the liquid flow rate can be reduced, and the liquid flow rate can be set to a necessary minimum.
[0010]
In this case, the surface angle difference may be made smaller than 90 degrees by providing an inclined surface on either the inside or the outside of the ridge line.
[0011]
Further, an exhaust path configured to pass through the periphery of the overflow tank from the coating area and to be discharged through the liquid level of the recovery tank is configured, and includes an exhaust flow generating unit that generates an air flow along the exhaust path. Is preferred. According to this means, since the airflow is configured to pass through the periphery of the overflow tank from the coating area and to be discharged through the liquid surface of the recovery tank, paint splashes generated in the coating area are transferred to the overflow tank. And the airflow passes through the gap between the overflow member and the surrounding member from which the liquid overflowing from the overflow tank flows down, and the airflow is then discharged through the liquid level of the recovery tank. With such a configuration, the paint splash can be taken into the liquid more reliably, and the collection rate of the paint splash can be increased.
[0012]
In this case, a sludge collection unit is configured in a downstream portion of the airflow in the collection tank, and a sludge collection container capable of holding sludge existing in the collection tank is disposed in the sludge collection unit. Is desirable. According to this means, the sludge moving along the airflow is introduced into the sludge collection container arranged on the downstream side portion, so that the sludge can be taken out from the sludge collection section.
[0013]
Further, it is preferable that an ozone mixing means for mixing ozone into the liquid in the recovery tank is provided. According to this means, by mixing ozone into the liquid in the recovery tank by the ozone mixing means, it is possible to suppress the growth of bacteria and bacteria in the liquid without using dangerous germicides.
[0014]
In this case, a sludge separating means for taking out the liquid in the collecting tank and separating sludge is provided, and the ozone mixing means is provided with a circulation path of the liquid between the collecting tank and the sludge separating means. It is desirable that the ozone be mixed in the middle. According to this means, the sludge can be separated and removed by the sludge separating means, and the ozone mixing means can be provided without complicating the apparatus configuration.
[0015]
In each of the above means, it is preferable that the liquid supply means circulates and supplies the liquid in the recovery tank to the overflow tank. Further, it is preferable that a partition member for restricting a passage area of the airflow is provided in the collection tank. This is because the recovery rate of paint splashes can be increased by increasing the flow velocity of the air stream to make the liquid surface rippling. Further, it is preferable to provide an upper bottom member for raising the bottom in a portion of the collection tank toward the sludge collection section, to promote the movement of the sludge to the sludge collection section.
[0016]
Further, the planar shape of the upper opening of the overflow tank is preferably a shape conforming to the planar shape of the coating area, for example, substantially similar to the planar shape of the painted shape, and slightly larger than the painted shape. Further, by forming the inclined surfaces both inside and outside of the overflow section, it becomes possible to allow the liquid to overflow more smoothly.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a longitudinal sectional view showing a schematic configuration of an embodiment of a coating booth according to the present invention, which is cut along a plane in the front-rear direction of the apparatus. FIG. FIG. 4 is a vertical partial cross-sectional view showing a state cut in FIG.
[0018]
The coating booth 30 of the present embodiment is configured to correspond to a coating area 20 configured so that a coating material is sprayed on a workpiece 22 from a spray gun 21 on the front side of the apparatus. As shown in FIG. 2, two coating areas 20 are provided on the left and right sides, and upper openings of the overflow tanks 31 are arranged below the respective coating areas 20. A water supply pipe 32 connected to the lower part of the apparatus is connected to the bottom of the overflow tank 31. V-shaped notches 31b are formed at substantially equal intervals around the entire periphery of the opening edge 31a of the upper opening of the overflow tank 31. A plate-like surrounding member 33 formed so as to surround the overflow tank 31 is disposed around the opening edge 31a that constitutes the overflow section of the overflow tank 31, and between the overflow tank 31 and the surrounding member 33. Is formed with a gap having substantially the same width over the entire circumference.
[0019]
A collecting tank 34 for collecting water is formed below the overflow tank 31. Water is always stored in the recovery tank 34 so as to have a water level shown in the drawing. When the water passes through the gap formed between the overflow tank 31 and the surrounding member 33 and proceeds downward, the water in the recovery tank 34 is stored. It is designed to reach the surface of the water. The recovery tank 34 is provided with a recovery section 34a corresponding to a portion below the overflow tank 31 and a water guide section 34b extending from the recovery section 34a to the rear of the apparatus and continuing to the inlet of the exhaust duct 35. On the water surface between the collecting part 34a and the water guiding part 34b, a partition plate 36 having a saw-toothed ventilation part 36a at the lower end edge is fixed. The ventilation-shaped portion 36a restricts the passage area of the airflow in the collection tank 34 to increase the flow velocity, and makes the liquid surface in the vicinity thereof ruffled, thereby increasing the paint droplet collection rate. At the bottom of the water guide portion 34b, an upper bottom member 37 configured to be gradually higher from the position where the partition plate 36 is formed toward the exhaust duct 35 is attached. On the raised portion of the upper bottom member 37, the exhaust duct 35 is formed vertically. In the exhaust duct 35, a return plate 35a for preventing the discharge of water is attached and fixed obliquely from the inner surface of the duct to the upstream side of the exhaust passage. An exhaust fan 38 is accommodated in an upper portion of the exhaust duct 35, and is configured to suck up the atmosphere in the exhaust duct 35 upward and discharge it to the side in FIG.
[0020]
As shown in FIG. 1, the airflow introduced through the gap between the overflow tank 31 and the surrounding member 33 travels substantially horizontally in the recovery tank 34 and reaches the inlet of the exhaust duct 35. The upper bottom member 37 is highest. A sludge collecting portion 34c is provided at a point (further back) where the upper bottom member 37 is highest. The sludge collecting portion 34c is configured as a portion protruding outward in the collecting tank 34. An openable / closable lid member 34d is attached to an upper portion of the sludge collecting portion 34c, and a metal net or a metal mesh configured to be able to be taken in and out by opening the lid member 34d inside the sludge collecting portion 34c. A sludge collection basket 34e, which is formed in a cage with a plate having a number of pores, is housed therein.
[0021]
The water pump 39 sucks water from the bottom of the recovery tank 34 and supplies water to the overflow tank 31 at a predetermined pressure through the water supply pipe 32. The water flow introduced into the overflow tank 31 by the water supply pump 39 advances from the bottom to the upper part, and overflows from the notch 31b formed in the opening edge 31a. The overflowing water passes between the outer periphery of the overflow tank 31 and the inner surface of the surrounding member 33 and returns to the collection tank 34 again. When the amount of circulating water is small, the overflowing water almost passes through the notch 31b. However, when the amount of circulating water is increased, the overflowing water overflows almost all of the opening edge 31a of the overflow tank 31, that is, overflows. become. Here, the above-mentioned overflow portion refers to a portion where water overflows, such as the cutout portion 31b of the overflow tank 31 or the opening edge 31a of the upper opening.
[0022]
By forming the notch 31b at the opening edge 31a, water can easily overflow, the minimum amount of water required for steady overflow can be reduced, and the amount of circulating water can be reduced. Can be reduced.
[0023]
As shown in FIG. 2, a sludge separation device 41 and an ozone generator 42 are also connected to the recovery tank 34. The water introduced from the recovery tank 34 is sludge-removed by the sludge separation device 41 and is returned to the recovery tank 34 again. The sludge separation device 41 is a known centrifuge. The ozone generator 42 is also a known device that converts oxygen into ozone by electric discharge. The ozone generated by the ozone generator 42 is configured to be blown at a high pressure into a return path of the water purified by the sludge separation device 41, that is, into a return pipe. For this reason, ozone melts into the water returned into the recovery tank 34, and bacteria, bacteria, and other harmful microorganisms generated in the water in the recovery tank 34 are removed by the ozone sterilizing action.
[0024]
In this embodiment, the water is always circulated between the overflow tank 31 and the recovery tank 34 by the water supply pump 39, and the exhaust fan 38 forcibly removes water from the gap between the overflow tank 31 and the surrounding member 33. Air is sucked, passes through the space above the water surface in the collection tank 34, and is generated as an airflow discharged through the exhaust duct 35. This airflow also occurs downward in the spraying direction in the coating area 20. In this state, the paint is sprayed from the spray gun 21 toward the work 22. The paint that has not been applied to the work 22 must be removed because it becomes paint splashes and floats in the air, causing environmental degradation. In the present embodiment, by disposing the water surface of the overflow tank 31 below the coating area 20, the paint splash is taken into the water on the water surface of the overflow tank 31 and is collected together with the water in the collection part 34 a of the collection tank 34. .
[0025]
The paint taken in the water becomes sludge and is dispersed in the water, and a part of the paint floats on the surface of the water and moves along the airflow to the water guiding section 34b. Since the water surface position L below the exhaust duct 35 rises as shown by the dotted line in FIG. 1 due to the pressure difference due to the airflow, the sludge also moves on the surface of the upper bottom member 37 and is eventually collected in the sludge collection basket 34e. You. The sludge is also separated and removed from the water in the sludge separation device 41.
[0026]
In the present embodiment, the paint splash is taken into the water by the water surface of the overflow tank 31, so that the water near the water surface where the paint splash is taken sequentially flows downward from the opening edge of the overflow tank 31 to the recovery tank. 34. Therefore, there is no need to form a water flow on an inclined surface or the like as in the related art, and if there is an overflow tank 31 having an area almost corresponding to the coating area 20 in a plan view, it is possible to collect paint splashes, Since it is not necessary to form an inclined surface for flowing a water flow, the size can be reduced in the vertical direction as compared with the conventional one.Moreover, the water circulation system and the sludge separation device can be reduced in size. It can be made compact.
[0027]
Further, in this embodiment, as shown in FIG. 1, a sludge collecting section 34c is provided, and the sludge generated in the collecting tank 34 is accommodated in the sludge collecting basket 34e accommodated therein. The sludge can be easily collected simply by opening the lid member 34d and taking out the sludge collection basket 34e.
[0028]
Further, in the present embodiment, as shown in FIG. 2, the ozone generator 42 is provided and the ozone is blown into the water in the recovery tank 34, so that the danger is higher than when other sterilizing agents are used. Less and easier maintenance.
[0029]
Next, with reference to FIG. 3 and FIG. 4, different examples of the overflow tank used in the coating booth according to the present invention will be described. The overflow tank 51 is fixed to the upper part of the water supply pipe 52, and the water supplied from the water supply port 51b formed at the bottom is stored inside the opening edge 51a of the upper opening. . An inclined surface 51c is formed inside the opening edge 51a, and an inclined surface 51d is formed outside the opening edge 51a. Water introduced from the water supply port is directed outward on the inclined surface 51c. It flows over the opening edge 51a, further flows on the inclined surface 51d, and then falls downward.
[0030]
The overflow tank 51 is configured to face an elongated coating area for coating the shaft-shaped member, and as shown in FIG. 3, a rectangular water surface that is long in the left-right direction is formed. Further, the water supply port 51b also has an elongated shape corresponding to the shape of the shaft-shaped member.
[0031]
In the overflow tank 51, the inclined surfaces 51c and 51d are continuously formed inside and outside the opening edge 51a, so that the difference in the surface angle between the inside and outside of the ridge line of the opening edge 51a of the overflow tank 51 is reduced. Therefore, the effect of the surface tension of the water at the opening edge 51a can be reduced, and a small amount of water can smoothly flow. Therefore, the apparatus can be operated with the minimum necessary water flow when continuously collecting paint splashes.
[0032]
【The invention's effect】
As described above, according to the present invention, the paint droplets are captured by the liquid surface of the overflow tank, and the liquid in which the paint droplets are captured overflows from the overflow section, and is collected in the recovery tank. As a result, the structure is simpler than that of a conventional painting booth, and there is no need to take measures such as uniformly flowing the liquid on the inclined surface to catch paint splashes. Since the capturing portion and the liquid circulating system can each be made compact, the size of the entire apparatus can be reduced.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing the structure of an embodiment of a painting booth according to the present invention.
FIG. 2 is a vertical partial cross-sectional view showing a cross section orthogonal to the cross section of FIG. 1 of the structure of the embodiment.
FIG. 3 is a plan view showing a structural example of an overflow tank different from that of the embodiment.
FIG. 4 is a vertical sectional view of the overflow tank shown in FIG.
FIG. 5 is a schematic configuration diagram showing a structural example of a conventional painting booth.
[Explanation of symbols]
Reference Signs List 20 coating area 21 spray gun 22 workpiece 30 painting booth 31 overflow tank 31a opening edge 31b notch 31c, 31d inclined surface 32 water supply pipe 33 peripheral member 34 recovery tank 34a recovery section 34b water guide section 34c sludge recovery section 34e Sludge collection basket 35 Exhaust duct 36 Partition plate 36a Ventilation portion 37 Upper bottom 38 Exhaust fan 39 Water pump 41 Sludge separator 42 Ozone generator 51 Overflow tank 51a Opening edge 51b Water supply ports 51c, 51d Inclined surface 52 Water supply pipe

Claims (8)

An overflow tank arranged below the coating area and provided with an overflow portion on the upper periphery,
Liquid supply means for supplying liquid to the overflow tank,
A collection tank for receiving and collecting the liquid overflowing from the overflow tank,
The coating booth, wherein the liquid supplied by the liquid supply means is introduced from inside the overflow tank, and paint splashes are caught at a liquid level of the liquid supplied to the overflow tank. 2. The coating booth according to claim 1, wherein the overflow portion of the overflow tank is provided with a cutout portion formed lower than the surrounding portion. The coating booth according to claim 1, wherein a difference in surface angle between ridges of the overflow section of the overflow tank is smaller than 90 degrees. 4. The coating booth according to claim 3, wherein the surface angle difference is smaller than 90 degrees by providing an inclined surface on either the inside or the outside of the ridge line. 2. The exhaust flow generating means according to claim 1, wherein an exhaust path is configured to pass through the periphery of the overflow tank from the coating area and to be discharged through a liquid level of the recovery tank, and to generate an air flow along the exhaust path. A painting booth comprising: In Claim 5, a sludge collecting portion is formed in a downstream portion of the airflow in the collecting tank, and a sludge collecting container capable of holding sludge present in the collecting tank is arranged in the sludge collecting portion. Features a painting booth. The coating booth according to claim 1, further comprising an ozone mixing means for mixing ozone into the liquid in the collection tank. 8. The apparatus according to claim 7, further comprising a sludge separating unit configured to remove the liquid in the collection tank and separate sludge, wherein the ozone mixing unit includes a circulation path of the liquid between the collection tank and the sludge separation unit. 9. A coating booth, wherein the ozone is mixed on the way.

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