JPH0568920A - Simple painting booth - Google Patents

Abstract

PURPOSE:To easily separate and recover paint sludge by a method wherein a washing solution used in the collection of paint mist is received in the falling process after the rising process due to the sucking action of an exhaust fan to be introduced into a separation tank to form paint sludge which is, in turn, led out to a filter device to separate the washing solution. CONSTITUTION:A washing water tank 2 is provided to the lower part of the spray painting region 1 of an object to be painted and a washing chamber 5 is formed on the rear side of a partition wall 3. Exhaust gas A containing paint mist is sucked in the washing chamber 5 along with washing water W in the vicinity of the gap 6 provided to the lower edge of the partition wall 3 at a high speed from the painting region 1 through the gap in a state atomized by the action of a curved plate 7. By this constitution, the paint mist in the sucked exhaust gas A is collected by the washing water W. Next, the washing water W containing the paint mist is received by an inclined plate 10 in the falling process after rising to be allowed to flow down to a separation tank 11 to form paint sludge S. The floated paint sludge S is led out to a reflux tank through an overflow weir 13 and separated from the washing water W by a filter device containing a conveyor 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a cleaning liquid tank below a spray coating area, and provides a gap between the lower edge of a partition wall for partitioning the spray coating area and the cleaning chamber and the liquid surface in the cleaning liquid tank. Through, sucking paint mist-containing exhaust gas from the spray coating area into the cleaning chamber, and, along with it, sucking a part of the cleaning liquid in the cleaning liquid tank into the cleaning chamber as a liquid for trapping the paint mist in the exhaust gas, The present invention relates to a simple coating booth provided with an exhaust fan that raises the suction cleaning liquid in the cleaning chamber in a state of being combined with the suction exhaust.

[0002]

2. Description of the Related Art The above-mentioned simple coating booth (see FIG. 9)
Paint mist containing exhaust A sucked from the spray coating area 1 into the cleaning chamber 5 through the gap 6 between the lower edge of the partition wall 3 for partitioning the spray coating area 1 and the cleaning chamber 5 and the liquid surface in the cleaning liquid tank 2. Is sucked from the cleaning liquid tank 2 in association with the suction, and is combined with the suction exhaust A in the cleaning chamber 5 with the exhaust fan 4
Trapped in the cleaning liquid W that is raised by the suction action of the exhaust gas A, whereby the paint mist is separated and removed from the exhaust gas A, and the exhaust gas A is removed.
The cleaning liquid W is sucked in by using the suction function of the exhaust fan 4 and subsequently raised in the cleaning chamber 5, and the cleaning liquid W that has captured the paint mist in the cleaning chamber 5 is After that, by returning to the cleaning liquid tank 2 by natural flow, the cleaning liquid circulation pump becomes unnecessary, and the apparatus cost,
Also, the running cost is reduced.

Conventionally, in this type of simple coating booth, as shown in FIG. 9, the cleaning liquid W that has captured the paint mist in the cleaning chamber 5 is directly returned to the cleaning liquid tank 2 without separating the captured coating material. Then, the paint sludge S is formed during the storage process in the cleaning liquid tank 2, and the coating sludge S is scraped and removed from the cleaning liquid tank 2 each time the accumulated amount reaches a certain level by manual work using a shovel or the like. Was there.

[0004]

However, the work of scraping the paint sludge S with a shovel or the like and taking it out from the cleaning liquid tank 2 is a work requiring a great deal of labor and time. This recovery work has become more difficult because a large amount of coating material has been used in which the sludge S becomes a large mass with high viscosity over time.

By the way, in a large-scale painting facility, as shown in FIG.
As shown in FIG. 5, the paint mist-containing exhaust A discharged from the spray coating work area 1 is passed through the throttle passage 41 at a high speed in a state where the exhaust mist A containing the paint mist and the falling cleaning liquid W from the cleaning liquid falling pan 40 are joined together.
Cleaning unit 4 for trapping the paint mist in the exhaust gas A into the cleaning liquid W
2 is provided below the spray painting work area 1, and the cleaning unit 4
The paint mist trapping cleaning liquid W discharged from 2 through the pipe 43 is supplied to the lower part of the levitation separation tank 44 together with the air bubbles, the paint sludge S is formed in the levitation separation tank 44 to be levitation separated, and the levitation paint Floating separation tank 4 for sludge S
4, the paint sludge S is sequentially separated and collected from the cleaning liquid W by flowing out to the filter 45 by an overflow from the cleaning liquid W. Also, the cleaning liquid in which the coating sludge S is floated and separated in the floating separation tank 44. There is one in which W is extracted from the bottom of the flotation separation tank 44 and returned to the cleaning liquid flow-down pan 40 via a pipe 46 for recycling (see, for example, JP-A-51-136726).

However, in this case, the installation floor of the flotation / separation tank 44 is made considerably lower than the installation floor of the cleaning section 42 so that the flotation / separation tank 44 is higher than the cleaning liquid discharge height of the cleaning section 42.
If the overflow height of the coating material can be lowered, the overflow of the floating paint sludge S in the floating separation tank 44 can be easily performed. A circulation pump 47 is used to return the cleaning liquid to the upper pan 40.
Is inevitable, and if the installation height between the cleaning unit 42 and the flotation separation tank 44 cannot be sufficiently high, the flotation separation tank 44 is sealed and the space inside the flotation separation tank 44 is closed. A vacuum pump 48 (in other words, equivalent to a pump for pumping) that raises the liquid level to the overflow height by depressurizing is required. Therefore, the above-mentioned paint sludge used in such large-scale coating equipment is required. If the separate collection method was simply applied to the above-mentioned simple coating booth,
The original feature and advantage of the simple coating booth, that is, the cleaning liquid circulation pump is not required, is lost.

In view of the above situation, an object of the present invention is to adopt a rational configuration in the above-mentioned simple coating booth so that paint sludge can be easily separated and recovered from the circulating cleaning liquid without the need for a pump. There is a point to.

[0008]

The first characteristic structure of the simple coating booth according to the present invention is to provide a cleaning liquid tank below the spray coating area and to provide a lower edge of a partition wall for partitioning the spray coating area and the cleaning chamber. The paint mist-containing exhaust gas is sucked from the spray coating area into the cleaning chamber through a gap between the cleaning liquid tank and the liquid surface, and a part of the cleaning liquid in the cleaning liquid tank is exhausted to the cleaning chamber. In a configuration provided with an exhaust fan that sucks into the cleaning chamber as a trapping liquid and raises the suction cleaning liquid by suction in the cleaning chamber in a state where the suction cleaning liquid merges with the suction exhaust, the suction action of the exhaust fan in the cleaning chamber The receiving part that receives the cleaning liquid that has risen due to the drop process and the paint mist capturing cleaning liquid that is received by this receiving part are received and the paint sludge is stored during the storage process. A separation tank for forming a dip, an overflow weir for overflowing the paint sludge from the separation tank by overflow, and a filtering device for separating the paint sludge flowing out of the overflow weir from the cleaning liquid,
A recirculation path for returning the cleaning liquid separated from the paint sludge by the filtering device to the cleaning liquid tank is provided, and a series from the receiving part to the cleaning liquid tank via the separation tank, the overflow weir, the filtering device, and the recirculation path. In order that the transfer of the treated product is carried out by natural flow due to the difference in height between the receiving part and the liquid surface in the cleaning liquid tank, the receiving part, the separation tank, the overflow weir, the filtering device, the reflux passage, the cleaning liquid tank. Are arranged relative to each other in the height direction, and the action and effect are as follows.

[0009]

In other words, according to the above-mentioned first characteristic configuration, the cleaning liquid that has been sucked into the cleaning chamber and has trapped the paint mist contained in the intake air is received by the receiving portion in the falling process after rising due to the suction action of the exhaust fan. Flow into the separation tank, and paint sludge is formed during the storage process in this separation tank, and this paint sludge flows out of the separation tank to the filtering device through the overflow weir, and is separated from the cleaning liquid by the filtering device. Are sequentially separated and collected from the washing liquid.

Further, the cleaning liquid separated from the paint sludge by the filtering device is recirculated to the cleaning liquid tank through the recirculation path and is circulated and used.

Further, due to the relative positional relationship in the height direction of the receiving portion, the separation tank, the overflow weir, the filtering device, the reflux passage, and the cleaning liquid tank, a series of transfer of the processed products, that is, from the receiving portion to the separation tank is carried out. Of the cleaning liquid, the transfer of the paint sludge from the separation tank to the filtering device through the overflow weir, and the transfer of the cleaning liquid from the filtering device to the cleaning liquid tank through the reflux passage between the receiving part and the liquid level in the cleaning liquid tank. It is performed by natural flow due to the height difference (in other words, the height difference given by the rise of the suction cleaning liquid in the cleaning chamber due to the suction action of the exhaust fan).

[0012]

As described above, as a result of the operation, according to the first characteristic construction of the present invention, the paint sludge is separated and collected from the cleaning liquid by the separation tank, the overflow weir, and the filtration device, so that the conventional simple coating booth can be used. Paint sludge collection work,
That is, compared with the case where the paint sludge generated in the cleaning liquid tank is scraped by a manual operation using a shovel and taken out from the cleaning liquid tank, the generated paint sludge can be collected very easily.

Further, by utilizing the original phenomenon of this kind of simple coating booth, that is, the level difference between the receiving portion and the liquid level in the cleaning liquid tank, the cleaning liquid is passed from the receiving portion through the separation tank, the overflow weir, the filtering device, and the return path. By performing a series of transfer of processed materials to the tank by natural flow, the original feature and advantage of not needing a pump can be maintained, and equipment cost,
The running cost can be reduced.

[Second and Third Characteristic Configurations of the Present Invention] A second characteristic configuration of the simple coating booth according to the present invention is a bypass return path that bypasses the overflow weir and returns the cleaning liquid from the separation tank to the cleaning liquid tank. And a flow rate adjusting means for adjusting the amount of the cleaning liquid recirculated through the bypass circulation path.

That is, if this second characteristic structure is adopted,
By adjusting the flow rate of the cleaning liquid through the bypass return passage, the liquid level in the separation tank can be adjusted to adjust the amount of the cleaning liquid that flows out from the overflow weir together with the paint sludge.
It is possible to more effectively separate and collect the paint sludge.

A third characteristic configuration of the simple coating booth according to the present invention is for guiding paint sludge, which blows out a part of the exhaust gas sent from the exhaust fan toward the side where the overflow weir is arranged on the liquid surface of the separation tank. There is a blowout port.

That is, if the third characteristic configuration is adopted,
Accumulation of the floating paint sludge generated in the separation tank on the overflow weir side and outflow of the floating paint sludge from the overflow weir can be promoted by blowing out air from the blowing port, thereby further separating and collecting the paint sludge. It can be done effectively.

Further, since a part of the exhaust gas is blown out from the blow-out port by utilizing the exhaust gas discharge function of the exhaust fan, the device structure can be simplified and the device cost can be reduced as compared with the case where a dedicated power device for collecting the paint sludge is provided. The running cost can be reduced.

[0019]

EXAMPLES Next, examples will be described.

1 to 5 show a device structure of a simple coating booth, which is a spray coating area 1 for spray coating an object to be coated.
A washing water tank 2 is provided below the partition wall 3, and the exhaust fan 4 is provided at the upper end on the back side of the partition wall 3 with respect to the spray coating area 1.
The cleaning chamber 5 communicating with the suction port 4a is formed.

The lower edge of the partition wall 3 is formed in a sawtooth shape, and a gap 6 is formed between this lower edge and the water surface of the washing water tank 2. The paint mist-containing exhaust A is sucked into the cleaning chamber 5 at high speed by the suction action of the exhaust fan 4, and accordingly, the cleaning water W near the gap 6 in the cleaning water tank 2 is sucked into the cleaning chamber 5 as water for trapping the paint mist being exhausted. , And its suction cleaning water W
While being guided to the curved plate 7, the suction action of the exhaust fan 4 causes the droplets to splash in the cleaning chamber 5 and rise in a state of being joined with the intake exhaust A.
The exhaust water A is purified by trapping the paint mist contained in the cleaning water W.

Denoted at 8 are drainers for draining the exhaust A from which the paint mist has been captured and removed by the wash water W in the cleaning chamber 5. The purified exhaust A drained by these drainers 8 passes through the exhaust fan 4 and the exhaust duct 9. Discharge through.

Reference numeral 10 is an inclined substrate as a receiving portion for receiving the cleaning water W which has captured the paint mist in the cleaning chamber 5 in the falling process after rising due to the suction action of the exhaust fan 4, and 11 is the spray coating area 1 Is a separation tank adjacent to the cleaning chamber 5 on the side opposite to the arrangement side of the inclined substrate 10
The paint mist trapping cleaning water W received by the inclined substrate 1
0 to flow down and collect, and then to flow into the bottom of the separation tank 11 via the communication channel 12 in the form of a weir, and in the process of storing wash water in the separation tank 11, the paint sludge S is formed, This paint sludge S is floated and separated.

The paint mist trapped in the wash water W in the wash chamber 5 exists in the wash liquid W as fine paint sludge particles to which bubbles are effectively given by gas-liquid contact due to the splash of the wash water W. Thus, the floating separation of the formed paint sludge S in the separation tank 11 is effectively performed.

Further, the separation tank 11 is disposed adjacent to the cleaning chamber 5 to shorten the cleaning water path from the cleaning chamber 5 to the separation tank 11, and the weir type communication passage 12 is passed through the cleaning water path.
In order to prevent the formation of large paint sludge in the middle of the communication passage 12 from the washing chamber 5 to the separation tank 11 by cutting off the fine paint sludge particles from the atmosphere, the paint sludge is captured. The cleaning water W is smoothly transferred to the separation tank 11, and the paint sludge S is separated from the separation tank 11.
It is formed appropriately in order to float and separate.

Reference numeral 13 is an overflow weir that causes the floating paint sludge S to flow out from one side of the separation tank 11 by overflow, and 14 is an overflow weir 13 in the separation tank 11.
Is a recirculation tank adjacent to the arrangement side of the recirculation tank, and a filtration device for separating the floating paint sludge S flowing out of the separation tank 11 together with a small amount of the washing water W through the overflow weir 13 from the washing water W above the reflux tank 14. 15 is provided, and as described above, by the floating separation of the paint sludge S in the separation tank 11, the separation and outflow of the paint sludge from the separation tank 11 through the overflow weir 14, and the filtering process by the filtering device 15,
The paint sludge S is separated and collected from the cleaning water W.

The filtering device 15 rotates the endless belt-shaped net 16a in the conveyor device 16 and advances the filter 17a fed from the roll filter 17 in one direction on the net 16a as the net 16a rotates. With the net 16a serving as a feed member and a support member for the filter 17a, the filter sludge on the net 16a receives the paint sludge S flowing out together with a small amount of the wash water W from the overflow weir 13 and filters it.

The used filter 17a to which the paint sludge S having a low water content after the filtration process is attached is fed into the collecting container 18 from the final end of the conveyor device 16 in the filter feeding direction.

The washing water W separated from the paint sludge S by the filtering process in the filtering device 15 is received in the reflux tank 14, and the reflux tank 14 and the reflux communication for communicating the reflux tank 14 with the cleaning water tank 2 are communicated with each other. Wash water tank 2 with mouth 19 as a return path
It is circulated for reuse by being refluxed.

An inclined bottom plate 20 is provided on the overflow weir 13 side of the separation tank 11, and the top of the inclined bottom plate 20 serves as the overflow weir 13, and the separation tank 1 is also provided.
1 shows the scraping plate 2 toward the overflow weir 13 side with the lower edge of the scraping plate 21 being put in the cleaning water W.
1 is moved in parallel, and after reaching the position of the inclined bottom plate 20, the scraping plate 21 is moved to the overflow weir 13 side while raising the scraping plate 21 so as to move the lower edge of the scraping plate 21 along the inclined bottom plate 20. After the forward movement and the scraping plate 21 reaches the final position on the overflow weir 13 side, the scraping plate 21 is opposite to the overflow weir 13 with the lower end edge of the scraping plate 21 being spaced upward from the water surface. There is provided a scraping device 22 which alternately repeats the returning operation of moving in parallel toward the tank end on the side.

That is, in order to efficiently separate and collect the paint sludge S from the wash water W, the amount of wash water flowing out of the overflow weir 13 together with the paint sludge S is limited to a minimum amount, but the above scraping device is also used. By means of 22, the paint sludge S floating in the separation tank 11 is accumulated on the overflow weir 13 side and the accumulated floating paint sludge S is discharged from the overflow weir 13 reliably and efficiently.

Further, the inclined bottom plate 20 having the top as the overflow weir 13 is provided, and the scraping plate 21 is used as the inclined bottom plate 20.
By performing the forward movement along with the above, the paint sludge S, which is partly settling due to the accumulation on the overflow weir 13 side, is surely discharged from the overflow weir 13.

When the scraping device 22 is used, a structure may be adopted in which almost the entire bottom of the separation tank 11 is the inclined bottom plate 20.

In the figure, 22a is an actuator for moving the scraping plate 21 in the horizontal direction, 22b is a guide bar for guiding the horizontal movement of the scraping plate 21, and 22c is an actuator for moving the scraping plate 21 in the vertical direction. Is.

Reference numeral 23 is a bypass flow passage for leading out the wash water W from the bottom of the separation tank 11 where the wash water W is easily drawn out without being accompanied by the paint sludge S, and allowing the wash water W to flow into the reflux tank 14. Yes, the bypass flow path 23, the reflux tank 14, and the above-described reflux communication port 19 form a bypass reflux path for bypassing the overflow weir 13 and returning the wash water W in the separation tank 11 to the wash water tank 2. is there.

Then, the reflux tank 1 of the bypass flow path 23
4, the outflow port 23a is disposed at substantially the same height as the overflow weir 13, and the outflow port 23a is a weir that allows the wash water W to flow out by overflow and has a height adjustable flow control weir. 24 is provided.

That is, regarding the relationship between the overflow weir 13 and the flow rate adjusting weir 24, the height of the flow rate adjusting weir 24 is adjusted to adjust the amount of wash water flowing out of the flow rate adjusting weir 24, so that the overflow paint sludge S and the overflow can be overflowed. The amount of washing water flowing out from the weir 13 (in other words, the water level of the separation tank 11) is adjusted to an optimum amount (water level) for separating the paint sludge from the overflow weir 13.

The paint sludge S flowing out from the overflow weir 13 is supplied onto the filter 17a in the filtering device 15 by the guide plate 25 protruding from the overflow weir 13 toward the reflux tank 14 side.
The washing water W flowing out from the tank is attached to the tank wall of the reflux tank 14 and the filtering device 1.
It is made to flow into the reflux tank 14 through the space between the filter 17a and the filter 17a in FIG.

In the simple coating booth having the above-mentioned structure, regarding the arrangement relationship of the respective parts in the height direction, the overflow weir 13 and the flow rate adjusting weir 24 are inclined so as to receive the rising washing water W in the washing chamber 5 in the dropping process. It is arranged at the same height as the lowermost part of the substrate 10 or lower than that and higher than the water surface of the washing water tank 2, and the water level of the separation tank 11 is an overflow weir 13 and a flow adjustment weir. 24
Of course, the height of the tank wall of the separation tank 11 may cause the wash water W of the separation tank 11 to overflow from a portion other than the overflow weir 13 and the flow rate adjustment weir 24. There is no height.

Further, the height of the tank wall of the reflux tank 14 is made higher than the water surface of the washing water tank 2, and the net 16a is constituted by the conveyor device 16 and the filter 17a fed from the roll filter 17. Filtration device 15
In the above, while the portion for receiving the paint sludge S flowing out from the overflow weir 13 is arranged at a position lower than the overflow weir 13, the entire filtering device 15 is arranged at a position higher than the water surface of the cleaning water tank 2.

That is, the inclined substrate 10, the separation tank 11, the overflow weir 13, the filtering device 15, the reflux tank 14, the reflux communication port 19, and the series of transfer of the processed substances across the washing water tank 2, and the separation tank 11 and the bypass flow path. 23, the reflux tank 14, the reflux communication port 19, and the bypass cleaning water transfer to the cleaning water tank 2, respectively, the height difference between the inclined substrate 10 and the water surface in the cleaning water tank 2 (that is, the cleaning chamber 5 by the suction action of the exhaust fan 4). In order to perform the natural flow utilizing the height difference given by the rise of the suction cleaning water W in (1), the respective parts are arranged relative to each other in the height direction, which makes it unnecessary to equip the cleaning water circulation pump. ..

Further, the bottoms of the washing water tank 2, the separation tank 11 and the reflux tank 14 are arranged on the same horizontal plane except for the inclined bottom plate 20 in the separation tank 11, so that for some tanks. It is possible to easily install the entire apparatus on a flat floor by eliminating the need to provide a gantry or to dug and form installation pits for some tanks on the floor.

[Other Embodiments] Next, other embodiments will be listed.

Instead of providing the scraping device 22 of the type in which the scraping plate 21 is reciprocally moved, the floating paint sludge S is obtained by blowing out gas on the liquid surface of the separation tank 11 toward the side where the overflow weir 13 is arranged. It is also possible to promote the accumulation of the slag on the overflow weir 13 side and the outflow of the floating paint sludge S from the overflow weir 13.

As an example, as shown in FIGS. 6 and 7, in the separation tank 11, on the liquid surface at the end of the separation tank 11 opposite to the side where the overflow weir 13 is arranged, the separation tank 11 covers almost the entire width. An air blowing chamber 26 is provided, and a shunt duct 27 branched from an exhaust duct 9 for guiding the exhaust air sent from the exhaust fan 4 is connected to the blast chamber 26, and the fan sending exhaust gas supplied to the blast chamber 26 by the shunt duct 27. Outlet 28 that blows out the water toward the arrangement side of the overflow weir 13 on the liquid surface of the separation tank 11.
Therefore, by utilizing a part of the exhaust gas delivered by the exhaust fan 4, the overflow weir 13 of the floating paint sludge S is provided.
It may be configured to promote the accumulation on the side and the outflow of the floating paint sludge S from the overflow weir 13.

In the above-described embodiment, the cleaning liquid W separated from the paint sludge S by the filter device 15 and the bypass passage 2
3 bypasses the overflow weir 13 to separate tank 11
The cleaning liquid W that has flowed out from the cleaning liquid W is recirculated to the cleaning liquid tank 2 through the reflux tank 14 together.
The reflux passage for returning the cleaning liquid W separated from the paint sludge S to the cleaning liquid tank 2 by 5 and the bypass return passage for bypassing the overflow weir 13 and returning the cleaning liquid W from the separation tank 11 to the cleaning liquid tank 2 are independent from each other. Good.

As an example thereof, as shown in FIGS. 6 and 7, a reflux passage for returning the cleaning liquid W separated from the paint sludge S by the filtering device 15 to the cleaning liquid tank 2 is used as in the above-described embodiment. 14, and the reflux communication port 19 that connects the reflux tank 14 and the cleaning liquid tank 2 to each other,
The separation tank 11 is provided on the side opposite to the side where the overflow weir 13 is arranged.
1, a second reflux tank 29 is provided adjacent to the first reflux tank 29, and a cleaning liquid W is drawn out from the bottom of the separation tank 11 so that the cleaning liquid W flows into the second reflux tank 29 by overflow, and a cleaning chamber. 5 is provided with a reflux communication passage 31 that communicates the second reflux tank 29 and the cleaning liquid tank 2 with each other. Therefore, the overflow passage 30, the second reflux tank 29, and the reflux communication passage 31 are independent of each other. It may be configured to form the bypass return path.

The washing liquid outflow portion of the overflow passage 30 with respect to the second reflux tank 29 is arranged at substantially the same height as the overflow weir 13, and the washing liquid outflow portion of the overflow passage 30 is described above. A flow rate adjusting weir 24 whose height can be adjusted similarly to the embodiment is provided.

Reference numeral 32 in the figure denotes a barrier plate which prevents the paint sludge from flowing out into the overflow passage 30.

In the above-described embodiment and the examples shown in FIGS. 6 and 7, the flow rate of the cleaning liquid is adjusted by the bypass return path for returning the cleaning liquid W from the separation tank 11 to the cleaning liquid tank 2 by bypassing the overflow weir 13. As the flow rate adjusting means, a flow rate adjusting weir 24 whose height can be adjusted by a weir that causes the cleaning liquid W to overflow is used. The flow rate adjusting means, for example, adjusts the opening of the flow path by operating the door body. Various types can be adopted, such as a type in which the amount of reflux of the cleaning liquid is adjusted.

In the filtering device 15, as shown in FIG. 8, the basket 33 is placed in the reflux tank 14 with the lower part immersed in the liquid, and the paint sludge S flowing out from the overflow weir 13 is collected in the basket 33. Alternatively, a method may be adopted in which the collected paint sludge S in the basket 33 is drained and collected by pulling the basket 33 out of the liquid in the reflux tank 14 when the paint sludge is collected.

The cleaning liquid W is not limited to water,
Aqueous solutions mixed with various chemicals and various liquids suitable for removing paint mist can be applied.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

[Fig. 1] Vertical section of the simple coating booth

FIG. 2 is a sectional view taken along line ii of FIG.

FIG. 3 is a plan view of the same.

FIG. 4 is a sectional view taken along the line

FIG. 5 is a perspective view of an overflow weir.

FIG. 6 is a sectional view showing another embodiment.

FIG. 7 is a plan view of the same.

FIG. 8 is a block diagram of a filtering device showing another embodiment.

FIG. 9 is a vertical sectional view showing a conventional structure.

FIG. 10 is a diagram showing another conventional equipment configuration.

[Explanation of symbols]

 1 Spray coating area 2 Cleaning liquid tank 3 Partition wall 4 Exhaust fan 5 Cleaning chamber 6 Gap 10 Receiving part 11 Separation tank 13 Overflow weir 14, 19 Reflux path 15 Filtration device 23, 14, 19 Detour reflux path 24 Flow control means 28 Discharge port A Exhaust S Paint sludge W Cleaning liquid

Claims (3)

[Claims] 1. A cleaning liquid tank (2) is provided below the spray coating area (1), and the lower edge of a partition wall (3) for partitioning the spray coating area (1) and the cleaning chamber (5) and the cleaning liquid tank. The paint mist-containing exhaust gas (A) is sucked into the cleaning chamber (5) from the spray coating area (1) through the gap (6) between the cleaning liquid and the liquid surface in (2), and the cleaning liquid is accordingly discharged. A part of the cleaning liquid (W) in the tank (2) is sucked into the cleaning chamber (5) as a liquid for capturing paint mist in the exhaust gas, and the suction cleaning liquid (W) is combined with the intake exhaust gas (A). A simple coating booth provided with an exhaust fan (4) that is raised by a suction action in the cleaning chamber (5), wherein the cleaning liquid (W) raised by the suction action of the exhaust fan (4) in the cleaning chamber (5). A catching part (10) that catches Separation tank (11) for receiving the paint mist capturing cleaning liquid (W) received by the receiving section (10) of the same and forming the paint sludge (S) in the storage process, and the paint sludge (S) for the separation tank (11) Overflow weir (13) to be discharged by overflow from
And a filter device (1) for separating the paint sludge (S) flowing out from the overflow weir (13) from the cleaning liquid (W).
5) and reflux paths (14) and (19) for returning the cleaning liquid (W) separated from the paint sludge (S) by the filtering device (15) to the cleaning liquid tank (2), the receiving portion (1)
0) to the separation tank (11), the overflow weir (13), the filtration device (15), and the reflux passage (1).
4), so that a series of processed material transfer to the cleaning liquid tank (2) via the (19) is performed by natural flow due to the height difference between the receiving part (10) and the liquid surface in the cleaning liquid tank (2). , The receiving part (10), the separation tank (11),
The overflow weir (13), the filtering device (1
5), a simple coating booth in which the reflux passages (14) and (19) and the cleaning liquid tank (2) are relatively arranged in the height direction. 2. By-pass reflux channels (23), (14), (19) for bypassing the overflow weir (13) and returning the cleaning liquid (W) from the separation tank (11) to the cleaning liquid tank (2).
Is provided, and this bypass return path (23), (14), (19)
The simple coating booth according to claim 1, further comprising a flow rate adjusting means (24) for adjusting the flow rate of the cleaning liquid recirculated. 3. An outlet for guiding paint sludge, which blows out a part of the exhaust gas delivered from the exhaust fan (4) on the liquid surface of the separation tank (11) toward the side where the overflow weir (13) is disposed. The simple coating booth according to claim 1 or 2, wherein (28) is provided.