JP3571577B2 - Sludge collection structure in the wash booth - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention improves the working environment of the coating booth by guiding the paint mist captured in the washing booth to the auxiliary water tank by a drain gutter together with circulating water, and collecting the floating or settling paint sludge by a solid-liquid separation device. The present invention relates to a washing booth structure for reducing maintenance work and efficiently separating paint sludge.
[0002]
[Prior art]
As a method of collecting paint mist generated at the time of spray coating, an air flow containing paint mist is passed through a shower section in which circulating water is dropped by a pump with a pump, and for a shower type washing booth that collects paint mist, A method in which the paint mist is taken into the circulating water that has been turned into water droplets by forcibly passing the air flow containing the paint mist using a turbofan or the like without using a pump, through the gap provided on the water surface of the booth. Venturi type washing booths (hereinafter referred to as “Venturi booths”) are often used because of their high paint mist collection efficiency and no need for pump maintenance. However, the paint mist collected in the circulating water is returned to the water tank together with the circulating water, so that paint sludge floats on the water surface in the venturi booth, accumulates in the water tank, or adheres to the wall of the water tank. Problems such as deterioration of performance of the paint and odor caused by decay of the paint sludge.
[0003]
In order to solve the problem caused by paint sludge, paint sludge dispersed in a water tank is pumped together with circulating water by a pump and sent to a solid-liquid separator to separate paint sludge from circulating water. However, collecting paint sludge dispersed in the circulating water in the water tank is inefficient, and in the case of a box-like shape like a conventional water tank, the flow of the circulating water at the corner of the water tank is poor. In addition, there is a problem that the paint sludge accumulates at the corner of the water tank and the paint sludge is not sucked into the pump, so that the paint sludge cannot be sufficiently collected. In addition, paint sludge easily collects and accumulates in places where the flow of circulating water is poor, such as the lower part of the swirl chamber, which has the problem of causing odors, rusting of the water tank, and difficulty in cleaning. .
[0004]
FIG. 6 shows a structure of a conventional venturi booth and an installation example of a solid-liquid separation device. The suction air 52 sucked by the exhaust fan 51 sends the paint mist 54 generated by the spray gun 53 to the gas-liquid contact part 60. A partition plate 58 for forming a suction gap 59 between a swirling chamber 57 having a curved shape and the water surface portion 56a is provided on a water surface portion 56a of the circulating water 56 in the water tank 55, and a paint mist is formed. When the suction air 52a containing the mist 54 passes at high speed, the circulating water 56 becomes droplets, and the suction air 52a containing the paint mist 54 and the circulating water 56 come into gas-liquid contact at the gas-liquid contact part 60, and at the same time, the swirl chamber 57 The centrifugal force collection at the curvature of is performed. As a result, the paint mist 54 taken in the droplets of the circulating water 56 is separated from the suction air 52b by the eliminators 61a, 61b, and 61c, and becomes the circulating water 62 containing the paint mist 54 as the drain hole of the drain gutter 63. Flow into 64.
[0005]
The circulating water 62 containing the paint mist 54 flowing into the drain hole 64 is returned to the near side of the circulating water 56 in the water tank 55 by the drain pipe 65. Then, the paint mist 54 is made non-adhesive by the chemical liquid supplied to make the paint mist 54 non-adhesive in the circulating water 56, and floats or sinks in the water tank 55 as paint sludge. However, the circulating water 66 containing the paint sludge drained from the drain pipe 65 diffuses throughout the circulating water 56 in the water tank 55. As a result, even if the pump 67 sends the circulating water 56 in which the paint sludge is diffused to the solid-liquid separation device 68, the content of the paint sludge contained in the circulating water 56 is not necessarily high, so that the collection efficiency of the paint sludge is low. The situation is inefficient. Reference numeral 68a denotes a flow from the pump 67 to the solid-liquid separator 68, and reference numeral 98b denotes a return flow from the solid-liquid separator 68 to the water tank 55.
[0006]
Further, the paint sludge diffuses into the water tank 55, and the paint sludge floating with the lapse of time also sinks, and at the same time, there is a place where the paint sludge is particularly likely to accumulate due to unevenness of the water flow in the water tank 55, and Had a problem that it became a source of offensive odor due to putrefaction and a cause of corrosion of an iron plate in an aquarium. It easily accumulates at the corners 69a and 69b in the water tank 55 and at the place 69c where the water flow is likely to stagnate. Further, the rear corner 69d of the water tank 55 and the lower part 69e of the drain gutter 63 are places where the water flow is easy to stagnate, and at the same time, there is a problem that it is difficult to perform maintenance such as cleaning.
[0007]
[Problems to be solved by the invention]
Paint mist collected in the circulating water in the water tank of the washing booth is dispersed, and is collected as paint sludge in places where the flow of circulating water is poor, such as at the corners of the water tank or under parts attached to the water tank. If paint sludge is pumped together with circulating water by a pump and then treated with a solid-liquid separator, paint sludge is dispersed in circulating water or This solves the problem that coating sludge cannot be sufficiently separated into solid and liquid by partially accumulating it.
[Means for Solving the Problems]
In the first invention, a method is employed in which a liquid surface of circulating water in the main water tank is sucked into a spiral chamber by a suction airflow of the paint mist, and the paint mist is collected by a liquid film and droplets formed in the spiral chamber. In a washing paint booth, a member for forming a water tank bottom plate in front of the swirl chamber is extended to form the swirl chamber, and further extended to a rear part of the swirl chamber to form a drain gutter, and paint from the swirl chamber is formed. Circulating water containing mist is discharged from the drainage gutter to an auxiliary water tank, and the auxiliary water tank is used to prevent paint sludge generated by floating or settling of the paint mist in the auxiliary water tank from returning to the main water tank. The circulating water is returned to the main tank from the upper and lower middle holes.
In the second invention, the circulating water returned to the main water tank flows into a water channel formed by the front side wall of the main water tank and the current plate, and flows from the upper part of the current plate to the spiral chamber side.
In the third invention, the paint sludge floating in the auxiliary water tank is dropped into the partition box together with the circulating water from the upper part of the partition box into which the suction port of the pump is inserted, and the pump sucks and sends it to the solid-liquid separation device. In the fourth invention, the paint sludge settled in the auxiliary water tank is introduced into the partition box together with the circulating water from the lower hole of the partition box into which the suction port of the pump is inserted, and the pump sucks the paint sludge. It was configured to be sent to a solid-liquid separator.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a side sectional view of a venturi booth according to an embodiment of the present invention, and FIG. 2 is a water tank section of the venturi booth according to an embodiment of the present invention. FIG. 3 is a plan view, and FIG. 3 is a front sectional view of a drain gutter of a venturi booth according to an embodiment of the present invention. FIG. 4 is a front cross-sectional view of the straightening gutter section and the partition box / pump section, in which floating paint sludge is treated. FIG. 5 is a front sectional view of the straightening gutter section and the partition box / pump section, and is a view in which settled paint sludge is treated.
[0010]
FIG. 1 is a side cross-sectional view of a venturi booth. A suction air 2 sucked by an exhaust fan 1 sends a paint mist 4 generated by a spray gun 3 to a gas-liquid contact portion 10. On the liquid surface 6a of the circulating water 6 in the main tank 5a, a partition plate 8 for forming a suction gap 9 between the curved swirl chamber 7 and the water surface portion 6a is provided. When the suction air 2a containing the mist passes at high speed, the circulating water 6 is turned into droplets, and the suction air 2a containing the paint mist 4 and the circulating water 6 come into gas-liquid contact at the gas-liquid contact part 10, and at the same time, Centrifugal force collection at the bend is performed. As a result, the paint mist 4 taken into the droplets of the circulating water 6 is separated from the suction air 2b by the eliminators 11a, 11b, and 11c, and flows out to the drain gutter 13 as circulating water 12 containing the paint mist 4.
[0011]
The water tank 5 is largely composed of a main tank 5a and an auxiliary tank 5b, and the circulating water 12 flowing out to the drain gutter 13 is once lifted above the water surface portion 6a and flows out to the drain gutter 13, and as shown in FIG. Since the drain gutter 13 is inclined downward to the auxiliary tank 5b, the circulating water 12 flows out from the circulation hole 15a of the partition plate 15 separating the main tank 5a and the auxiliary tank 5b to the auxiliary tank 5b. The circulating water 12a that has flowed out to the auxiliary tank 5b reduces the flow rate of the paint mist 4 contained in the circulating water 12a due to the reduced flow velocity and the chemical supplied to the coating water to make the paint mist 4 non-adhesive. It floats on the water surface 16 of the auxiliary tank 5b as paint sludge 17a or, depending on the type of paint, sinks as paint sludge 17b at the bottom of the auxiliary tank 5b.
[0012]
Further, as shown in FIGS. 4 and 5, the circulating water 12b from which the paint sludge 17a and the paint sludge 17b are separated in the auxiliary tank 5b is returned to the main tank 5a from the return hole 15b in front of the partition plate 15. At this time, since the return hole 15b is formed at an intermediate depth of the water level of the auxiliary tank 5b, the paint sludge 17a floating on the water surface 16 of the auxiliary tank 5b and the paint sludge 17b settled at the bottom of the auxiliary tank 5b are formed. 5a is prevented from flowing. Further, the circulating water 12b may be returned by underflow to the paint sludge 17a that floated using the weir, or the circulating water 12b may be returned by overflow to the paint sludge 17b that has settled. Is also good. The circulating water 12b returned from the return hole 15b to the main tank 5a flows into a straightening gutter 18 formed by being divided by a straightening plate 17 almost in parallel with the front side wall of the main tank 5a, and then the straightening plate 17 is made substantially uniform. The water flows over the water surface portion 6a from the near side and flows out toward the swirl chamber 7 through a gentle flow. For this reason, even if the paint mist 4 from the spray gun 3 falls on the water surface 6a, it is smoothly drawn into the swirl chamber 7 and captured by the circulating water 12.
[0013]
As shown in FIG. 1, the bottom of the main tank 5a is integrally formed from the horizontal portion 18a with the inclined portion 14 inclined toward the spiral chamber 7 and the drainage gutter 13 from the spiral chamber 7 through the introduction plate 13a. Have been. For this reason, since there is no place where sludge accumulates like the water tank of the conventional venturi booth, all the paint mist captured in the main tank 5a is sent to the auxiliary tank 5b, and the paint mist is accumulated in the main tank 5a. Maintenance, such as cleaning, is greatly reduced.
[0014]
In the auxiliary tank 5b, a pump 21 for sucking and sending the paint sludge 17a or the paint sludge 17b together with the circulating water 12a to the solid-liquid separation device 20 is installed, and a suction port 21a of the pump 21 is provided by a partition box 22 or a partition box 23. It is installed in a partitioned position. The partition box 22 or the partition box 23 is provided for the purpose of concentrating the paint sludge 17a or the paint sludge 17b separated from the circulating water 12a in the auxiliary tank 5b as much as possible and sucking the paint sludge through the suction port 21a. In the case of the paint sludge 17a floating on the water surface 16, since it is difficult to suck the paint sludge 17a from the suction port 21a, the paint sludge 17a is mainly overflowed from the upper part of the partition box 22 and dropped into the partition box 22, so that the circulating water 12b The suction volume is reduced as much as possible. Conversely, in the case of the paint sludge 17b settled at the bottom of the auxiliary tank 5b, the paint sludge 17b is formed through the partition box hole 23a formed in the lower part of the partition box 23 in order to minimize the suction amount of the circulating water 12b. Is sucked into the subject.
[0015]
The paint sludge 17a or the paint sludge 17b sucked from the suction port 21a is sent to the solid-liquid separation device 20 via the pipe 20a, and the sludge component and moisture are separated. The separated water 20c is returned to the auxiliary tank 5b by the return pipe 20b, and is returned to the main tank 5a as the circulating water 12b from the return hole 15b in front of the partition plate 15. The solid-liquid separation device 20 can use various separation methods such as a centrifugal separation method and a filtration method.
As described above, all of the paint mist 4 captured in the main tank 5a and the volute chamber 7 is sent to the auxiliary tank 5b as the circulating water 12a by the drain gutter 13 and circulated by reducing the flow velocity in the auxiliary tank 5b. The paint mist contained in the water 12a is separated as paint sludge 17a or paint sludge 17b. The paint sludge 17a or 17b is concentrated by the partition box 22 or 23 and sent to the solid-liquid separator 20 by the pump 21, so that the solid-liquid separation process is performed efficiently. The paint sludge 17a or the paint sludge 17b is returned to the main tank 5a from the return hole 15b in front of the partition plate 15 as the separated circulating water 12b. As a result, there is almost no paint mist 4, paint sludge 17a or paint sludge 17b in the main tank 5a.
[0017]
【The invention's effect】
The present invention is configured as described above, and has the following effects.
(1) Paint mist and paint sludge do not accumulate in the main tank for performing the painting work, so that maintenance is almost unnecessary and a painting work environment free of offensive odor is obtained.
(2) Since the paint sludge is concentrated in the auxiliary tank and the partition box and then sent to the solid-liquid separation device, the solid-liquid separation process is performed efficiently.
[Brief description of the drawings]
FIG. 1 is a side sectional view of a Venturi booth according to an embodiment of the present invention.
FIG. 2 is a plan view of a water tank portion of the venturi booth according to the embodiment of the present invention.
FIG. 3 is a front sectional view of a drain gutter portion of a venturi booth according to an embodiment of the present invention.
FIG. 4 is a front sectional view of a straightening gutter section and a partition box / pump section of the embodiment of the present invention, in which floating paint sludge is treated.
FIG. 5 is a front sectional view of a straightening gutter section and a partition box / pump section according to the embodiment of the present invention, in which settled paint sludge is treated.
FIG. 6 is a side sectional view of a venturi booth in a conventional example.
FIG. 7 is a detailed plan view of a water tank section of a venturi booth in a conventional example.
[Explanation of symbols]
2 Suction air 4 Paint mist 5 Water tank 5b Auxiliary tank 6 Circulating water 6a Liquid level 13 Drain gutter 17 Rectifier plate 18 Rectifier gutter 20 Solid-liquid separator 21 Pump 21a Suction port 22 Partition box

Claims (4)

In a washing paint booth of a system in which the paint mist is sucked into the swirl chamber together with the liquid level of the circulating water in the main tank by a suction air flow, and the paint mist is collected by a liquid film and droplets formed in the swirl chamber. The vortex chamber is formed by extending the formation member of the water tank bottom plate at the front of the vortex chamber, and further extended to the rear of the vortex chamber to form a drain gutter, and circulating water containing paint mist from the vortex chamber. From the drain gutter to the auxiliary water tank, and from the upper and lower middle holes of the auxiliary water tank, so as to prevent the paint sludge generated by floating or settling of the paint mist in the auxiliary water tank from returning to the main water tank. A rinsing painting booth wherein circulating water is returned to the main water tank. The circulating water returned to the main water tank flows into a water channel formed by a front side wall of the main water tank and a current plate, and flows from an upper portion of the current plate to the spiral chamber side. The first wash booth. The paint sludge floating in the auxiliary water tank is dropped into the partition box together with circulating water from the upper part of the partition box into which the suction port of the pump is inserted, so that the pump sucks the paint sludge and sends it to the solid-liquid separation device. The washing booth according to claim 1 or 2, wherein the washing booth is configured. The paint sludge settled in the auxiliary water tank is introduced into the partition box together with circulating water from the lower hole of the partition box into which the suction port of the pump is inserted, and the pump sucks the paint sludge and sends it to the solid-liquid separator. The flushing booth according to claim 1 or 2, wherein:

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