JP3196996U - Paint soot collection and recovery equipment in wet painting booth - Google Patents

Abstract

[PROBLEMS] To efficiently collect and recover even non-adhesive large paint fountains and foam-like paint fountains that floated on the surface of a wet pond in a wet painting booth, and to install a pond liquid surface and a pump. Provided is a paint fouling collection and recovery device that can provide a sufficient pump head even when the height difference of the parts is large. A paint cake suction / collecting section (16) having a shape that opens laterally to the surface of the water so that the opening sucks the surface layer portion of the booth circulating water laterally and has an opening lower part (17) extended from the upper part. It is attached to the float 18 and connected to a positive displacement pump through a hose 19. [Selection] Figure 2

Description

  The present invention relates to an apparatus for collecting and collecting paint soot that has floated on the surface of a pond in a wet painting booth.

  2. Description of the Related Art Conventionally, there is a spray coating method in which paint is sprayed on an object to be coated as a kind of coating method for automobiles, electrical products and the like. In the spray painting method, paint is sprayed in a wet painting booth in order to maintain the quality of the paint and preserve the work environment. This wet painting booth has a painting chamber for spraying paint on an object to be coated, a duct having a fan for sucking air in the painting chamber, and a contact portion for bringing the sucked air and the booth circulating water into contact with each other. And a pond that can store circulating water at the booth.

  In this wet painting booth, uncoated paint that has not been applied to the object to be coated is sucked into the duct together with air by the fan. At this time, the uncoated paint is collected in contact with the booth circulating water at the contact portion, and separated by settling or floating the uncoated paint. The uncoated paint thus separated is collected.

  Precipitation or levitation of unpainted paint and its recovery are mainly performed at Tsugaike, but collection of settled paint is mainly performed at the time of cleaning of Tsugaike, which is done at a time when the painting plant stops operation for a certain period of time. It is usually conducted manually, and there are many problems such as adjustment with the operation schedule, drainage or temporary storage of a large amount of booth circulating water, and treatment of a large amount of collected paint cake. On the other hand, the collection and collection of floating paint fountains can be carried out continuously even when the painting plant is in operation, and therefore, the paint buoys are collected and collected at many painting booths.

  Known methods and methods for collecting and collecting paint scum used to float and collect paint scum include means such as pumping by a bucket, suction by a float pump, or scraping by a skimmer. Many devices and methods combining these means have been proposed. For example, Patent Document 1 discloses a method for solid-liquid separation of a paint cake that sends the paint cake collected by a float pump to an inclined solid-liquid separator, and Patent Document 2 discloses a liquid surface near the float of the float pump. A suction device for a liquid surface floating substance is disclosed in which a large paint cake caught on a suction port of a float pump is dropped into a suction port by generating a wave by swinging. Further, FIG. A configuration is shown in which a part of the discharged liquid is returned from the discharge side to the suction side to exert the ejector effect and increase the suction efficiency. Patent Document 4 discloses a device for providing an air suction port in place of the ejector nozzle to increase the floating separation efficiency of the paint cake in the subsequent separation layer.

  These conventional technologies share the same technical idea of collecting paint lees that floated on a floating pond in the pond. Normally, the suction port that is the opening of the float pump is connected to the surface of the booth circulating water. It is installed with an opening upward, slightly below the water surface in the parallel direction, and draws paint slag and booth circulating water from the surrounding water surface. However, the disadvantage of this opening is that a large paint cake is caught on the outer edge of the opening and does not fall well into the inlet. As a countermeasure, the above-mentioned Patent Document 2 discloses a liquid level floating material that generates a wave by swinging the liquid surface in the vicinity of the float of the float pump and drops a large paint cake caught in the suction port of the float pump into the suction port. Although a suction device is disclosed, if such measures are added, the operation of the collection and recovery device becomes complicated, and it becomes difficult to achieve efficient paint soot recovery. Another disadvantage is that the foamed soot that floats on the surface of the booth circulating water is light, so it is difficult to suck only the booth circulating water below the foam and collect the foamed soot. On the other hand, the float pump is a submersible pump such as a centrifugal pump or an axial flow pump. If there is a large difference in height from the subsequent solid-liquid separator, etc., a gap (gap) between the impeller and the pump casing is required to increase the head. The amount of liquid to be fed is reduced, making it impossible to efficiently collect and collect paint scum, and large paint scum tends to be clogged in a small gap, causing the pump to stop operating. Furthermore, if there is a problem with the float pump and its associated equipment and equipment, it is necessary to bring the collection / collection device centered on the float pump to the so-called “shore” of Tsugaike or to repair it by pulling it up to the shore. Such an operation is cumbersome and time-consuming.

  On the other hand, in Patent Documents 5 and 6, the paint fountain suction collecting part in which the opening (= suction port) is opened in the vertical direction with respect to the water surface of the booth circulating water, that is, installed in the lateral direction. And a paint soot collection and recovery device in which a pump portion connected to the so-called pond shore is placed. If the opening is in such a direction, the disadvantage of the suction port of the type that opens upwards, such as a large paint cake caught on the suction port, or the collection of foam-like soot is eliminated. If the upper and lower positions of the opening are too low, there is a drawback that a lot of booth circulating water is sucked in addition to the floated paint tank, and conversely if it is too high, a lot of air is sucked. FIG. 2 of Patent Document 6 shows a method of finely adjusting the vertical position of the suction port by interlocking the water level monitoring device with the air cylinder and pushing the suction port with the air cylinder. However, it is cumbersome to constantly adjust such ancillary equipment and maintain an appropriate position. In addition, although there is no description or suggestion about the type or performance of the pumps installed on the shore of the so-called Tsugaike shore in Patent Documents 5 and 6, there is no description that suggests, but in general centrifugal pumps that are frequently used, suction is performed. It is easy to cause cavitation phenomenon and air hammer phenomenon due to air, and when the Tsugaike is installed underground and the pump is installed on the ground due to the effective use of the recent factory site, a high pump head is also required.

  From the above, even if the paint fountain levitated on the surface of the circulating water in the wet paint booth pond is a large paint fountain or foam paint fountain, it can be efficiently collected and recovered. There is also a need for a paint soot collection and recovery device that can provide a sufficient pump head even when there is a large difference in height between the pump installation part and the pump installation part.

JP 7-47354 A JP-A-8-252577 JP 2003-284978 A JP 2004-237175 A Japanese Utility Model Publication No. 55-28451 JP-A-7-882

  The present invention is a device that collects and collects paint soot that floats on the surface of a wet pond in a wet painting booth, and can efficiently collect and collect even large paint soot and foam-like paint soot. An object of the present invention is to provide a paint soot collection and recovery device that can obtain a sufficient pump head even when the height difference between the pond liquid level and the pump installation part is large.

  As a result of intensive research to achieve the above-mentioned problems, the present inventor has found that the opening is opened in the vertical direction with respect to the water surface of the booth circulating water, that is, the paint bottle installed in the lateral direction. If the lower part of the opening (= suction port) of the suction collection part is a shape that is extended compared to the upper part, it can be efficiently collected and recovered even if it is a large paint cake or a foam-like paint cake, and It was found that the extended lower structure can suck the booth circulating water from the lower layer of the opening and suck the minimum necessary booth circulating water at the lower end of the opening. In addition, by connecting a positive displacement pump that does not cause cavitation phenomenon and air hammer phenomenon to the paint soot suction collection part, even if there is a large difference in height between the pond liquid level and the pump installation part, a sufficient pump The head can be obtained and the present invention has been accomplished.

  In other words, the invention according to claim 1 is a paint tank that sucks the surface layer portion of the booth circulating water including the booth circulating water and the non-adhesive coating tank floating on the surface of the booth circulating water in the wet pond of the wet painting booth. A paint soot collecting and collecting device for connecting a suction collecting part and a positive displacement pump, wherein an opening of the paint soot suction collecting part opens in a direction perpendicular to the water surface of the booth circulating water, and the opening The paint cake collecting and collecting device is characterized in that the lower part of the paint has a shape that is extended as compared with the upper part.

  According to the paint soot collection and collection device of the present invention, even if a large paint soot or foam-like paint soot can be collected and recovered efficiently, and there is a large difference in height between the pond liquid level and the pump installation part However, since a sufficient pump head can be obtained, it is possible to achieve a stable and efficient wet paint booth collection and recovery of the paint.

It is the schematic for demonstrating the whole structure in the Example of this invention. In the paint soot collecting and collecting apparatus of the present invention, the paint soot suction and trapping has a shape that opens in a direction perpendicular to the water surface and sucks in a lateral direction, and has a shape in which the lower part of the opening is extended as compared with the upper part. It is a figure which shows an example of a collection part. The paint sachet collecting and collecting apparatus of Comparative Example 1 has a shape that opens in the vertical direction with respect to the water surface and sucks in the horizontal direction, and the lower and upper portions of the opening have the same length and vertical position. It is a figure which shows an example of the coating material suction suction collection part. It is a figure which shows an example of the paint cake suction collection part which opens in the horizontal direction with respect to the water surface in the paint cake collection collection apparatus of the comparative examples 2 and 3, and has an upward suction port.

  The present invention is a wet paint booth pond, a non-tacked paint tank floating on the surface of the booth circulating water, and a paint tank suction collecting section for sucking the surface layer portion of the booth circulating water including the booth circulating water, A paint fountain collecting and collecting device connected to a positive displacement pump, wherein the opening of the paint fountain suction collecting portion opens in a direction perpendicular to the water surface of the booth circulating water, and the lower portion of the opening is compared with the upper portion. A paint cake collecting and collecting device characterized by having a stretched shape.

  The wet painting booth in the present invention is a spray painting method, which is a kind of painting method for automobiles and electrical products, and has a painting room for spraying paint on the object to be coated and a fan for sucking the air in the painting room. It is a painting booth of the type provided with the duct which has, the contact part for making the sucked air and booth circulating water contact, and the Tsugaike pond which can store booth circulating water.

  In the present invention, in the wet painting booth pond, the non-adhesive paint tank that floats on the surface of the booth circulating water is placed on the surface of the booth circulating water. These include foamed cocoons that have floated, and these paint candy can be obtained by levitation treatment or levitation dispersion treatment.

  Examples of the non-adhesive agent used in the above floating treatment or floating dispersion treatment include melamine-aldehyde resin acid colloid, phenol-formaldehyde resin, polyolefin resin emulsion, higher fatty acid emulsion, higher alcohol emulsion, polyaluminum chloride, aluminum sulfate, Alumina sol, bentonite, sepiolite, etc. can be used and can be appropriately selected according to the type and properties of the target paint, but preferably melamine-aldehyde resin acid colloid, phenol-formaldehyde resin, polyolefin resin emulsion, higher fatty acid emulsion, higher grade Alcohol emulsion and alumina sol.

  The amount of the tackifying agent added can be appropriately selected according to the type and properties of the target paint, but is usually 3 to 10% by weight with respect to the uncoated paint.

  In addition, a polymer flocculant is usually used in combination with the above levitation dispersion treatment. Examples of the polymer flocculant include polyacrylamide, acrylamide-acrylic acid copolymer, polyacrylaminoethyltrimethylammonium chloride, polymethacrylamino. Ethyltrimethylammonium chloride, acrylamide-acrylaminoethyltrimethylammonium chloride copolymer, acrylamide-methacrylaminoethyltrimethylammonium chloride copolymer, acrylamide- [2- (acryloyloxy) ethyl] benzyldimethylammonium chloride / [2- (acryloyl) Oxy) ethyl] trimethylammonium copolymer, DADMAC-acrylamide copolymer, etc. can be used, and are selected appropriately according to the type and properties of the target paint. Preferably, acrylamide-acrylic acid copolymer, acrylamide-acrylaminoethyltrimethylammonium chloride copolymer, acrylamide-methacrylaminoethyltrimethylammonium chloride copolymer, acrylamide- [2- (acryloyloxy) ethyl] Benzyldimethylammonium chloride / [2- (acryloyloxy) ethyl] trimethylammonium copolymer.

  The amount of the polymer flocculant to be added can be appropriately selected according to the type and properties of the target coating material, but is usually 0.1 to 2% by weight with respect to the uncoated coating material.

  In the present invention, the paint soot suction collecting part sucks the non-adhesive paint soot that floats on the surface of the booth circulating water and the surface layer portion of the booth circulating water including the booth circulating water in the wet pond of the wet painting booth. The opening portion (= suction port) is open in the direction perpendicular to the water surface of the booth circulating water, and the lower portion of the opening portion has a shape that is extended as compared with the upper portion.

  The positive displacement pumps used in the present invention are classified into reciprocating pumps and rotary pumps, and there are piston pumps, plunger pumps, bellows pumps, diaphragm pumps, etc. as reciprocating pump types. Gear pumps (= Gear pumps), vane pumps, screw pumps, roller pumps, and the like, which generally have a high head, do not cause cavitation, and do not easily cause air hammer. Among them, a reciprocating pump that can transfer the collected large paint cake without being relatively broken is preferable, and a diaphragm pump having a large liquid feeding amount is particularly preferable.

  Moreover, as a power source of the positive displacement pump used in the present invention, there are types such as a motor drive, a solenoid drive, and an air drive, any of which can be applied and can be appropriately selected.

  Various devices can be selected as the solid-liquid separation device following the paint soot collecting and collecting device of the present invention, and examples thereof include a decanter and a pressurized levitation device with a skimmer. If a large paint slag is introduced without being broken by this, good solid-liquid flotation and separation efficiency can be obtained. Suitable as a device.

  With regard to the paint soot collecting and collecting apparatus of the present invention, for example, based on FIG. 1, a method for setting the vertical position of the opening (= suction port) of the paint soot suction collecting part will be described. Float 6 is attached to the water surface of the booth circulatory water, and an opening is placed sideways on the surface of the pond and floated on the pond. The lower structure extended from the upper part of the opening is placed slightly below the surface of the water. The upper and lower positions of the paint soot suction collecting part 5 are adjusted by the float 6 so that the minimum booth circulating water necessary for maintaining the fluidity of the surface layer portion of the circulating booth water is scooped up. If the position of the paint soot suction collection part relative to the water surface of the booth circulating water is too high, the proportion of the booth circulating water necessary to maintain the fluidity of the surface layer of the suction booth circulating water will be reduced and unnecessary. The air is sucked in and the stability of the liquid feeding operation is hindered. In addition, if the position of the paint soot suction collection part relative to the water surface of the booth circulating water is too low, the ratio of the booth circulating water will increase and the fluidity of the suction will be improved, but the tack free floating on the water surface The collected rate of the paint cake 7 decreases, and it becomes difficult to achieve efficient paint cake collection.

  The paint soot suction and collection unit 5 is connected to the positive displacement pump 8 by a hose. However, this hose is temporarily set in the reservoir and then raised from the water surface and connected to the positive displacement pump 8 so that it is unnecessary. Prevent inhaling air. The positive displacement pump 7 is installed on the above-ground part of the “shore” of Tsugaike. The paint cake collected and collected in this manner is transferred to a subsequent solid-liquid separation device (pressure floatation device 9 with a skimmer in FIG. 1) to obtain a more concentrated paint cake.

  As long as the effects of the present invention are not reduced, other processing agents and other apparatuses can be used in combination with the paint soot collecting and collecting apparatus of the present invention. For example, it is possible to use odor countermeasure treatment agents, microbial preparations, and antifoaming agents (however, if the foam is completely removed, the collection rate of the paint cake is reduced), etc. It is good to install.

  The present invention will be specifically described below, but the present invention is not limited to these examples.

(Example 1)
An example of an embodiment of the present invention is shown in FIG. In the wet painting booth, the painting room 1 for spraying paint on the object to be coated, the contact part 2 for bringing the uncoated paint into contact with the booth circulating water and collecting it in the booth circulating water, the booth circulating water can be stored A pond 3 and a circulation pump 4 for circulating the booth circulating water are provided. The uncoated paint collected in the booth circulating water in the contact portion 2 is made non-tacky by the non-tackifying agent 14 added to the booth circulating water on the suction side of the circulation pump 4, and further from the contact portion 2. The polymer coagulant 15 added in the vicinity of the pit to the pond is agglomerated and floats on the surface of the booth circulating water in the pond and forms a non-tacky paint jar 7. The paint cake suction / collecting section 5 whose vertical position is adjusted by the float 6 is connected to the positive displacement pump 8, and by operating the positive displacement pump 8, the non-adhesive paint cake 7 floating on the surface of the booth circulating water, And the surface layer portion of the booth circulating water including the booth circulating water is sucked and collected by the paint soot suction collecting unit 5. The positive displacement pump 8 was installed on the above-ground part of the “shore” of Tsugaike. The paint cake collected and recovered in this way is transferred from the positive displacement pump 8 to the subsequent pressure levitating device 9 with skimmer, mixed with the pressurized water 10 (compressor is omitted) and placed on the water surface of the pressure levitating device 9. It floats and is separated and scraped off by the skimmer 11 and recovered as a more concentrated paint cake 12. Moreover, the treated water 13 after separating the paint cake is returned to the Tsugaike 3.

  Example 1 was carried out in accordance with the embodiment of FIG. 1, and the paint used was an aqueous base paint for automobiles. As the tackifier 14, melamine-aldehyde resin acid colloid was used in an amount of 5% by weight. As the coating material and the polymer flocculant 15, an acrylamide-acrylic acid copolymer of 0.5% by weight and an uncoated material were used. The opening (= suction port) of the paint soot suction collection part 5 is open in a direction perpendicular to the water surface of the booth circulating water, and has a shape for sucking the surface layer portion of the booth circulating water laterally. The lower part of the part has an elongated shape compared to the upper part. A schematic diagram of the opening is shown in FIG. As the positive displacement pump 8, a Welden pump (trade name: manufactured by Wilden Pump & Engineering (USA)), which is an air-driven diaphragm pump, was used. This Welden pump was installed on the above-ground part of the “shore” of Tsugaike, the amount of which was fed was about 100 L / min, and the head from the surface of the Tsugaike was about 10 m.

  The effect is the ratio (%) of the total dry weight of paint cake collected by the pressure flotation device in 3 days to (total dry weight of uncoated paint generated in 3 days + total dry weight of drug added in 3 days) ), And the paint soot recovery rate after 3 days of operation was evaluated.

(Example 2)
Example 2 was the same as Example 1 except that the paint used was replaced with an oil-based clear paint for automobiles.

(Example 3)
Example 3 was under the same conditions as Example 1 except that the paint used was changed to a combination of two water-based base paints and an oil-based clear paint. The uncoated paint weight ratio of the water-based base paint to the oil-based clear paint was about 2: 1.

(Comparative Example 1)
In Comparative Example 1, the paint cake suction / collecting portion 5 is shown in FIG. 3, and the opening (= suction port) is open in the direction perpendicular to the water surface of the booth circulating water, and the surface layer portion of the booth circulating water However, the same conditions as in Example 1 were obtained except that the lower part and the upper part of the opening were replaced with the paint bowl suction / collecting part having the same length and vertical position.

(Comparative Example 2)
In Comparative Example 2, the paint cake suction / collecting unit 5 shown in FIG. 4 has an opening that opens horizontally to the surface of the booth circulating water, and sucks the surface layer of the booth circulating water from the upward suction port. The conditions were the same as in Example 1, except that the paint suction suction collecting part was replaced.

(Comparative Example 3)
Comparative Example 3 is the same as in Example 1 except that the paint soot suction collection part 5 and the positive displacement pump 8 (Welden pump) are replaced with conventional float pumps (a type in which an underwater pump is directly connected to an upward suction port). Same conditions.

  The results of Examples 1 to 3 and Comparative Examples 1 to 3 are shown in Table 1.

  In Examples 1 to 3, a good paint soot recovery rate was obtained. In Comparative Example 1, the booth circulating water is also sucked from the lower layer of the opening (= suction port), so the amount of paint soak sucked relatively decreases, and the paint soot cannot be collected efficiently. The rate was low. In Comparative Example 2, a large soot was caught at the outer edge portion of the suction port of the paint soot suction collection part, and the recovery of the floating paint soot to the suction port was hindered, so the paint soot recovery rate was low. In Comparative Example 3, since the lift of the float pump was short, the liquid could not be stably fed to the pressurized flotation device, and the paint cake could hardly be recovered.

  From the above results, according to the paint soot collection and recovery device of the present invention, even if the paint soot that floated on the surface of the circulating water of the booth in the wet paint booth is not necessary, it is necessary. Even when the intake port shape that sucks in the minimum booth circulating water can efficiently collect and recover, and there is a large difference in height between the pond liquid level and the pump installation part, a sufficient pump head can be obtained, and cavitation phenomena and It has been shown that stable and efficient wet paint booth collection and collection can be achieved without causing an air hammer phenomenon and shutting down operation.

：ブース循環水の表層部分の流れを示す 1: Coating chamber 2: Contact part 3: Tsugaike 4: Circulating pump 5: Paint soot suction collecting part 6: Float 7: Non-tacked paint soaked on the surface of the Tsugaike booth circulating water 8: Positive displacement pump
9: Pressurized floating device with skimmer 10: Pressurized water 11: Skimmer
12: More concentrated paint cake 13: Treated water 14: Non-adhesive agent 15: Polymer flocculant 16: Paint cake suction / collection section 17 that opens in a direction perpendicular to the water surface and has a suction port in the horizontal direction: Opening in the vertical direction with respect to the water surface, and extending the horizontal suction port 18: Float 19: Hose 20 for connecting the paint fountain suction collector and the positive displacement pump: Opening in the horizontal direction with respect to the water surface , Upward suction port 21: water surface

: Shows the surface layer flow of booth circulating water

The present inventor, as a result of intensive studies to achieve the above object, an opening, so as to suck the surface layer portion of the booth circulation water sideways, opening sideways on the water surface of the booth circulation water, i.e., If the lower part of the opening (= suction port) of the paint fountain suction collecting part that is open in the horizontal direction is extended compared to the upper part, it is a large paint fountain or foam-like paint fountain. However, it is possible to efficiently collect and recover the water, and the extended lower structure suppresses the suction of booth circulating water from the lower layer of the opening, and sucks the minimum necessary booth circulating water at the lower end of the opening. I found that I can do it. In addition, by connecting a positive displacement pump that does not cause cavitation phenomenon and air hammer phenomenon to the paint soot suction collection part, even if there is a large difference in height between the pond liquid level and the pump installation part, a sufficient pump The head can be obtained and the present invention has been accomplished.

In other words, the invention according to claim 1 is a paint tank that sucks the surface layer portion of the booth circulating water including the booth circulating water and the non-adhesive coating tank floating on the surface of the booth circulating water in the wet pond of the wet painting booth. A paint fountain collection and collection device that connects a suction collection section and a positive displacement pump, and the opening of the paint fountain suction collection section sucks the surface layer of the booth circulating water sideways so that the booth circulates. An apparatus for collecting and collecting paint scum, characterized in that it opens laterally on the surface of water and has a shape in which the lower part of the opening is extended compared to the upper part.

It is the schematic for demonstrating the whole structure in the Example of this invention. In the paint cake collecting and collecting apparatus according to the present invention, the paint cake suction and collection portion having a shape that opens sideways to the water surface and sucks horizontally, the lower portion of the opening portion being extended compared to the upper portion. It is a figure which shows an example. In the paint cake collecting and collecting apparatus of Comparative Example 1, the paint cake suction having a shape that opens sideways on the water surface and sucks sideways, the lower portion and the upper portion of the opening portion having the same length and vertical position. It is a figure which shows an example of a collection part. It is a figure which shows an example of the paint cake suction collection part which opens in the horizontal direction with respect to the water surface in the paint cake collection collection apparatus of the comparative examples 2 and 3, and has an upward suction port.

The present invention is a wet paint booth pond, a non-tacked paint tank floating on the surface of the booth circulating water, and a paint tank suction collecting section for sucking the surface layer portion of the booth circulating water including the booth circulating water, This is a paint soot collection and recovery device connected to a positive displacement pump, and the paint soot suction collection part opens sideways on the surface of the booth circulating water so that the surface layer of the booth circulating water is sucked sideways . An apparatus for collecting and collecting paint scum having an opening and a shape in which a lower portion of the opening is extended as compared with an upper portion.

In the present invention, the paint soot suction collecting part sucks the non-adhesive paint soot that floats on the surface of the booth circulating water and the surface layer portion of the booth circulating water including the booth circulating water in the wet pond of the wet painting booth. The opening (= suction port) opens sideways on the water surface of the booth circulating water so that the surface layer of the booth circulating water is sucked sideways, and the lower part of the opening extends compared to the upper part. It has the shape which was made.

Example 1 was carried out in accordance with the embodiment of FIG. 1, and the paint used was an aqueous base paint for automobiles. As the tackifier 14, melamine-aldehyde resin acid colloid was used in an amount of 5% by weight. As the coating material and the polymer flocculant 15, an acrylamide-acrylic acid copolymer of 0.5% by weight and an uncoated material were used. The opening (= suction port) of the paint cake suction / collecting part 5 is open laterally to the surface of the booth circulating water, and has a shape for sucking the surface layer part of the booth circulating water laterally, and the lower part of the opening Has an elongated shape compared to the upper part. A schematic diagram of the opening is shown in FIG. As the positive displacement pump 8, a Welden pump (trade name: manufactured by Wilden Pump & Engineering (USA)), which is an air-driven diaphragm pump, was used. This Welden pump was installed on the above-ground part of the “shore” of Tsugaike, the amount of which was fed was about 100 L / min, and the head from the surface of the Tsugaike was about 10 m.

(Comparative Example 1)
In Comparative Example 1, the paint cake suction / collecting section 5 has an opening (= suction port) shown in FIG. 3 that opens sideways on the surface of the booth circulating water, and the surface layer portion of the booth circulating water faces sideways. The shape was the same as in Example 1 except that the lower part and the upper part of the opening were replaced with the paint cake suction / collection part having the same length and vertical position.

：ブース循環水の表層部分の流れを示す

1: Coating chamber 2: Contact part 3: Tsugaike 4: Circulating pump 5: Paint soot suction collecting part 6: Float 7: Non-tacked paint soaked on the surface of the Tsugaike booth circulating water 8: Positive displacement pump 9: Pressurized levitation device with skimmer 10: Pressurized water 11: Skimmer 12: More concentrated paint bottle 13: Treated water 14: Non-adhesive agent 15: Polymer flocculant 16: Open sideways on the water surface, sideways suction Paint cake suction / collection section 17 having a mouth: Lower structure that opens laterally to the water surface and has a horizontal suction port extended 18: Float 19: Hose 20 that connects the paint cake suction collection section and the positive displacement pump: Water surface Open horizontally, upward suction port 21: water surface

: Shows the surface layer flow of booth circulating water

Claims (1)

In the wet painting booth pond, a non-tacky paint hoe floating on the surface of the booth circulating water, a paint hoe suction collecting part for sucking the surface layer portion of the booth circulating water including the booth circulating water, and a positive displacement pump A paint soot collecting and collecting device to be connected, wherein an opening of the paint soot suction collecting part opens in a direction perpendicular to the water surface of the booth circulating water, and a lower part of the opening is extended as compared with an upper part. A paint cake collecting and collecting device characterized by having a shape.

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