JP2007260594A - Recovery apparatus of unfixed coating material and recovery method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recovery apparatus of unfixed coating material and a recovery method thereof which can efficiently coagulate and recover unfixed coating material, being not fixed to a work even in the coating equipment of performing coating with an aqueous coating material, and can prevent the apparatus from being made larger-size. <P>SOLUTION: The unfixed coating material produced in a coating booth 4 is collected by collecting water and is fed into a fist separation tank 12, where coating material sludge is coagulated and floated with a separating agent supplied through a first separating agent supply piping 21, the coagulated and floated coating material sludge is transferred to a second separation tank 14 by a float type pump 13 and is coagulated and floated for the second time with a separating agent supplied through a second separating agent supply piping 33, and the coating material sludge coagulated and floated for the second time is collected in a collecting chamber 35 and is recovered into a recovery tank 37. A suction pipe 30 for producing fine air bubbles in collecting liquid in a transfer path 16 is connected to the float type pump 13. Therein, a polymer coagulant and a charge neutralizer are included in the separating agent supplied through the first separating agent supply piping 21, and a polymer coagulant is included in the separating agent supplied through the second separating agent supply piping 33. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a technique for recovering paint mist generated in a painting facility.

  When painting a workpiece with a spray gun or electrostatic painting at the painting booth, uncoated paint that does not adhere to the workpiece surface stays in the painting booth and adheres again to the workpiece surface, resulting in poor coating such as rough skin. May cause. For this reason, conventionally, an air flow that flows downward from above in the painting booth is created, and uncoated paint is caused to flow down into the collection chamber below the painting booth, and this is collected by the collected water that flows along the wall surface of the collection chamber. A technique is known that collects, separates and captures an uncoated paint from collected water by a separation device, and discards it.

At this time, in the “Paint Mist Removal Device for Coating Equipment” proposed in Patent Document 1, mistakes supplied to the cleaning device at the entrance of the exhaust space and uncoated paint captured by the capturing liquid are supplied through a liquid supply path. By flowing down to the first separation tank and adding an alkali agent and an aggregating agent in the middle of the liquid supply path, the uncoated paint captured by the mist capturing liquid in the first separation tank floats and aggregates on the liquid surface. The sludge is floated and collected in the collecting pit of the first separation tank, and then sent to the second separation tank together with the mist capturing liquid by a sludge pump. Then, the agglomeration further progresses in this second separation tank, and the increased floating sludge is discharged to the lower sludge storage tank by a scraping device disposed in the second separation tank, and further, the paint sludge and A mechanism is adopted in which the mist capturing liquid is separated and the paint sludge is sent to a portable sludge container and the mist capturing liquid is sent to the first separation tank.
JP 7-148451 A

  However, although the above-mentioned conventional technology can deal with the treatment of organic solvent-type paints, water-based paints that have recently been frequently used due to environmental problems and the like are inherently soluble in water. Therefore, when it is attempted to separate with the separation device as described above, the floating sludge that has floated and aggregated on the liquid surface in the first separation tank is stirred by the sludge pump, re-dissolved in the mist capturing liquid, and second It takes time to agglomerate and float the paint sludge, such as when it is sent to the separation tank, and it is necessary to agglomerate and float the sludge again in the second separation tank. There was a problem such as inviting.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to make it possible to efficiently agglomerate and collect paint sludge even when a water-based paint is applied, and to prevent an increase in the size of the apparatus.

  In order to achieve the above object, the present invention collects uncoated paint discharged from a painting booth of a painting facility by a collecting liquid, sends it to the first separation tank, and uncoating which floats in the first separation tank. In the unpainted paint recovery apparatus in which the paint is sent to the second separation tank through the transfer path by the transfer pump, and the unpainted paint aggregated in the second separation tank is collected in the collection tank, in the first separation tank, While providing the 1st separating agent supply piping for supplying a separating agent in a tank, the 2nd separating agent supply piping for supplying a separating agent in a tank was provided in the said 2nd separating tank.

  Then, after supplying the separating agent from the first separating agent supply pipe into the collected liquid of the first separation tank to float and aggregate the paint sludge, and after feeding the paint sludge aggregated and floated by the transfer pump to the second separation tank, Further, the separating agent is supplied from the second separating agent supply pipe into the collected liquid of the second separation tank to cause the paint sludge to coagulate and float, and this paint sludge is collected in the collection tank. Even when the paint sludge is fed into the separation tank, even if the paint sludge is dissolved by the transfer pump and re-dissolved in the collected liquid, the separation agent is supplied again in the second separation tank. The paint sludge can be agglomerated and floated, and an increase in the size of the second separation tank can be avoided.

  At this time, as a separation agent in each separation tank, for example, as in claim 3, in the first separation tank, a separation agent containing a polymer flocculant and a charge neutralizing agent is supplied into the tank. In the two-separation tank, it is preferable to supply a separation agent containing only the polymer flocculant among the polymer flocculant and the charge neutralizer from the viewpoint of the aggregation effect and cost.

In the present invention, the transfer pump is configured as a float type in which the suction opening maintains a substantially constant position below the liquid level, and the upper end always protrudes above the liquid level in the vicinity of the transfer pump. And an intake pipe having a lower end opened in the suction part of the pump.
Further, if fine bubbles are mixed into the collected liquid in the transfer path by driving the transfer pump as in claim 4, even if the concentration of the paint sludge in the transfer path is high, This prevents problems such as clogging and paint sludge adhering to the inner wall of the transfer path.
Further, by configuring the suction opening of the transfer pump to be a float type that maintains a substantially constant position below the liquid level, the paint sludge can be efficiently fed into the second separation tank.

The uncoated paint collected by the collection liquid was sent to the first separation tank, and the paint sludge was flocculated and floated by the separation agent supplied through the first separation agent supply pipe, and this was sent to the second separation tank by the transfer pump. Thereafter, by supplying a new separating agent through the second separating agent supply pipe in the second separation tank, the coating sludge can be efficiently recovered even when it is re-dissolved. At this time, the polymer flocculant and the charge neutralizing agent are included as the separating agent supplied to the first separation tank, and only the polymer flocculant is included as the separating agent supplied to the second separation tank. Then, efficient separation and recovery of paint sludge can be achieved.
In addition, the transfer pump is constructed as a float type, and an intake pipe is provided in the vicinity of the transfer pump so that the upper end protrudes above the liquid level and opens, and the lower end opens into the suction part of the pump. Fine bubbles can be mixed in the collected liquid, and problems such as clogging of the transfer path and adhesion of paint sludge to the inner wall are prevented.

Embodiments of the present invention will be described with reference to the accompanying drawings.
Here, FIG. 1 is an explanatory view showing the overall configuration of the recovery apparatus according to the present invention, FIG. 2 is a front view of a float pump used in the apparatus, and FIG. 3 is a plan view of the float pump.

  The unpainted paint recovery device according to the present invention can efficiently recover the unpainted paint generated at the coating booth, and can recover the water paint effectively and without increasing the size of the device. Has been.

  That is, as shown in FIG. 1, a coating facility 1 to which the present unpainted paint recovery apparatus is applied includes a coating apparatus 2 that sprays paint onto the vehicle body W and an unpainted paint that has not been applied to the vehicle body. The collection device 3 is provided with a separation device 3 for temporarily retaining the collected liquid and separating and recovering the uncoated paint from the coating solution 2. And a painting robot 5 disposed in the painting booth 4, and the painting robot 5 is provided with a painting gun 5 a for spraying paint onto the vehicle body W.

  And the punching metal 4p for rectifying the air sent downward from the upper air ejection hole 6 is disposed on the upper surface of the painting booth 4, and in the lower part of the painting booth 4, Of the paint sprayed from the coating gun 5a, a collection chamber 4h for collecting uncoated paint that has not been applied to the vehicle body W is provided. The lower surface of the collection chamber 4h is an inclined floor 7, and an upper part of the inclined floor 7 is provided with a collected water supply tank 8 capable of flowing the collected water in a curtain shape along the floor surface. The uncoated paint flowed down by the air flow can be fed into the first separation tank 12 through the drainage port 10 and the drainage channel 11 below the inclined floor 7.

  The separation device 3 stores the first separation tank 12 that stores the collected uncoated paint and collected liquid, and the second separation that stores the collected liquid sent from the first separation tank 12 by the float pump 13. A tank 14 and a recovery tank 15 for recovering paint sludge discharged from the second separation tank 14 together with industrial water are provided, and a part of the collected liquid is directed from the first separation tank 12 toward the second separation tank 14. In order to feed, a transfer path 16 is connected to the output part of the float pump 13, and a part of the collected liquid is supplied to the collected water supply tank 8 below the first separation tank 12. A collected water supply path 17 is connected, and a feed pump 18 is disposed in the middle of the collected water supply path 17. In the collected water supply tank 8 to which the collected water is supplied, the collected water is discharged in a curtain shape toward the inclined floor 7 as described above.

  In addition, when the one end side into which the unpainted coating material is sent from the said drainage channel 11 among the 1st separation tanks 12 is made into the upstream end side 12a for convenience, the said collected water supply path 17 is the upstream end side 12a. It is connected below the downstream end 12b which is the opposite other end. The float pump 13 is also disposed on the downstream end side 12b.

  A return path 20 is connected to the second separation tank 14 so that a part of the collected liquid in the second separation tank 14 can be returned to the first separation tank 12, and an outlet portion of the return path 20 is The upper end 12a of the first separation tank 12 is located at an upper position spaced apart from the liquid surface by a certain distance. Further, the outlet portion of the drainage channel 11 is also located at an upper position spaced apart from the liquid surface by a certain distance.

  A first separation for supplying a separating agent diluted solution obtained by diluting a separating agent containing a polymer flocculant and a charge neutralizing agent in the first separation tank 12 to the upstream end side 12 a of the first separation tank 12. An agent supply pipe 21 is provided, and a constant amount of the separating agent diluent is always supplied while the coating booth 4 is operating. Then, by adding this separating agent diluent, coagulation and floating of the paint sludge is promoted.

The capacity of the first separation tank 12 is the amount of paint sprayed in the painting booth 4, the coating efficiency, the floor area of the painting booth 4, the amount of collected water flowing through the inclined floor 7 of the painting booth 4, However, in the case of the present embodiment, the volume of the first separation tank 12 employs a float pump 13 described later, and the second separation tank. 14 also enables the paint sludge to be efficiently agglomerated and floated (described later), so that the residence time of the collected liquid in the first separation tank 12 can be shortened, and the size can be reduced as compared with the prior art. It became so.
In addition, the capacity | capacitance of the 1st separation tank 12 of a present Example is about 300 tons.

  As shown in FIGS. 2 and 3, the float pump 13 includes four floats 22, a gantry support portion 23 connected to the float 22, and a motor attached to the gantry support portion 23 via a gantry 24. The motor 25 is housed in a casing 26, and a cup 28 is connected to one end side of the casing 26 via a suction portion 27. The upper surface opening 28a of the cup 28 can suck the collected liquid including the paint sludge, and is always positioned below the liquid surface (indicated by the phantom line) having a certain depth e. .

  Incidentally, the depth e from the liquid level is set to 10 to 30 mm in the present embodiment in order to efficiently feed the paint sludge that has agglomerated and floated on the liquid level to the second separation tank 14. If it is less than 10 mm, it is difficult to ensure an adequate supply amount to the second separation tank 14, and paint sludge that coagulates and floats near the opening of the cup 28 tends to adhere to and accumulate on the opening of the cup 28. Therefore, if it exceeds 30 mm, the concentration of the industrial sludge for industrial water sent to the second separation tank 14 decreases, and the separation of the paint sludge in the second separation tank 14 is efficiently performed. There is a risk of being lost.

  In addition, an intake pipe 30 for sucking air into the casing 26 is connected to the suction portion 27, and the intake pipe 30 has a length such that the upper air suction port is located above the liquid level. It has been.

A rotating body 31 is provided on the output shaft of the motor 25, and the sucked collected liquid can be fed into the discharge pipe 32 by the fins 31f of the rotating body 31, and the discharge pipe The transfer path 16 is connected to 32.
Further, in this embodiment, a gap d of about 5 mm is provided between the tip of the fin 31f and the casing 26 so that the paint sludge is not easily clogged between the rotating body 31 and the casing 26. Yes. This is because if this gap d is too small, paint sludge is clogged between the rotating body 31 and the casing 26, leading to discharge failure of the pump 13.

The float pump 13 as described above sucks air simultaneously from the intake pipe 30 when sucking the collected liquid containing paint sludge through the cup 28, and the sucked air is a rotating body having fins 31f in the casing 26. By stirring in the collected liquid by the rotation of 31, fine bubbles are formed, and the effect of preventing the paint sludge from aggregating in the transfer path 16 and adhering to the inner wall of the transfer path 16 is demonstrated. To do.
In particular, when the size of the first separation tank 12 is reduced, the water level is likely to fluctuate up and down because the volume is reduced. However, by adopting the float pump 13, a substantially constant location from the liquid level can be obtained. The collected liquid containing the paint sludge can be sucked.

  The second separation tank 14 is provided to agglomerate and float the paint sludge again from the collected liquid sent from the first separation tank 12, to separate and recover the concentrated paint sludge and to discard it. Compared to the volume of the separation tank 12, it is formed to be about 1/10 to 1/100. In this embodiment, it is about 4 tons.

  As shown in FIG. 1, the second separation tank 14 has an upstream end side 14a as one end side to which the collected liquid is supplied from the transfer path 16 for convenience, and a downstream end side 14b as the other end side opposite thereto. In this case, the outlet of the transfer path 16 is positioned at a position above the liquid level on the upstream end side 14a, and the second separating agent supply pipe 33 is connected to the vicinity of the terminal end of the transfer path 16. . The return path 20 is connected below the downstream end side 14b.

  And from the 2nd separating agent supply piping 33, the separating agent dilution liquid which diluted the separating agent containing the polymer flocculant is always supplied toward the transfer path 16 during the operation of the coating booth 4. It has become.

  Further, a weir 34 is provided on the downstream end side 14b of the second separation tank 14 slightly below the liquid level, and is adjacent to the weir 34 in order to collect paint sludge that has entered beyond the weir 34. The collection chamber 35 is provided, and a discharge pipe 36 is connected to the collection chamber 35, and a collection tank 37 is provided downstream of the discharge pipe 36. A mesh-like wire net is disposed on the upper part of the collection tank 37.

  Then, the collected liquid fed into the second separation tank 14 is dropped onto the liquid surface from a position higher by a predetermined height from the outlet of the transfer path 16, and the collected liquid and air are also stirred here to paint sludge. Aggregation and growth are promoted.

  In the coating facility 1 as described above, as a precondition before the operation, the industrial water is supplied from the industrial water supply pipe to the first separation tank 12 of the separation device 3, and from the first separating agent supply pipe 21, the polymer agglomeration is performed. A separation agent mainly composed of an agent and a charge neutralizing agent is supplied, and the concentration of the separation agent in the first separation tank 12 is adjusted to 2.5 ppm (750 grams of separation agent for 300 tons of industrial water). . At this time, the content (solid content) of the polymer flocculant in the separating agent is preferably 0.8 to 1.0%, and the content (solid content) of the charge neutralizing agent is 3.5 to 5.5%. Is preferred.

That is, when the content of the polymer flocculant is less than 0.8%, a sufficient aggregation effect cannot be obtained in a short time, and even when the content exceeds 1.0%, the aggregation effect hardly changes, and the cost increases. Become.
In addition, when the content (solid content) of the charge neutralizing agent is 3.5% or less, the neutralization of the uncoated paint becomes incomplete and it becomes difficult to aggregate, and the content (solid content) is 5.5. When it exceeds more than%, the aggregation effect of the polymer flocculant is inhibited.
The molecular weight of the polymer flocculant is preferably 20,000 or more and less than 100,000. When the molecular weight is 20,000 or less, it takes time to agglomerate and grow the paint sludge, and the separation tank becomes large. On the other hand, if the molecular weight is 100,000 or more, the aggregation of the paint sludge becomes enormous and the float pump 13 is clogged or the weir 34 is clogged.

  In this state, when the vehicle body W is conveyed to the painting booth 4 by the conveyance conveyor, the painting robot 5 is operated to spray the paint toward the vehicle body W. At this time, the uncoated paint that has not been applied to the vehicle body W is collected in the collection chamber 4h by the air flow blown from above, and is collected in the collected water flowing down the inclined floor 7 in a curtain shape. It is sent to the first separation tank 12 through the drain port 10 and the drain channel 11.

In the first separation tank 12, a separation agent mainly composed of a polymer flocculant and a charge neutralizing agent is supplied from a first separation agent supply pipe 21. At this time, the content (solid content) of the polymer flocculant in the separating agent is 0.8 to 1.0%, and the content (solid content) of the charge neutralizing agent is 3.5 to 5. 5%.
Then, the supply amount of the separating agent per minute is calculated from the coating efficiency to the vehicle body W in the coating booth 4. For example, a separating agent in an amount of about 0.2% of the uncoated paint per minute is further diluted and continuously supplied.

  Then, in the first separation tank 12, the collected liquid flows from the upstream end side 12a toward the downstream end side 12b, and the paint dispersed in the collected liquid aggregates as paint sludge by the action of the separating agent, Surface. As a result, the paint is hardly contained in the vicinity of the bottom of the first separation tank 12, particularly in the vicinity of the downstream end side 12 b, and in the vicinity of the liquid surface, a large amount of paint sludge formed by agglomeration of the paint is collected. The collected liquid is collected.

  The collected liquid containing a large amount of paint sludge near the liquid surface is sucked by the float pump 13, mixed with the air sucked from the intake pipe 30, and sent to the second separation tank 14 in a state containing a fine valve. . For this reason, the collection liquid containing a high concentration paint sludge is fed to the second separation tank 14.

  In the transfer path 16, air is fed into the collected liquid while being agitated into fine bubbles, so that a situation in which clogging occurs in the transfer path 16 and aggregates accumulate on the inner wall is suppressed. Then, the separating agent containing only the polymer flocculant is supplied from the second separating agent supply pipe 33 connected to the vicinity of the terminal end of the transfer path 16, and the paint is supplied from the outlet of the transfer path 16 opened above the liquid level. The collected liquid whose sludge aggregation has been promoted flows down into the second separation tank 14.

  Here, the content (solid content) of the polymer flocculant in the separating agent supplied from the second separating agent supply pipe 33 connected near the end of the transfer path 16 is 0.2 to 0.4%. The supply amount of the separating agent per minute is calculated from the coating efficiency of the coating booth 4 on the vehicle body W. For example, a separating agent in an amount of about 0.2% of the uncoated paint per minute is further diluted and continuously supplied.

  At this time, if the content (solid content) of the polymer flocculant is 0.2% or less, a sufficient aggregation effect cannot be obtained in a short time, and even if the content exceeds 0.4%. The agglomeration effect is hardly changed, resulting in an increase in cost.

  And even if the coating sludge is redissolved in the collected liquid by stirring the fins 31f of the float pump 13 by supplying the separating agent from the second separating agent supply pipe 33, in the second separation tank 14, The paint sludge begins to agglomerate and float in a short time, and paint sludge having a large particle size grows and floats near the liquid surface. Such paint sludge overflows the weir 34 on the downstream end side 14b of the second separation tank 14 and is collected in the collection chamber 35, and is discharged onto a mesh-like wire net in the collection tank 37 to remove the paint sludge. Is done.

  On the other hand, when the paint sludge floats, the paint content of the collected liquid near the bottom of the second separation tank 14 decreases. The collected liquid having a reduced paint content is taken out from the vicinity of the bottom of the second separation tank 14 and returned to the upstream end 12 a of the first separation tank 12 through the return path 20. In addition, even if the collected liquid contains some paint that could not be separated, it floats by aggregation until it flows to the downstream end side 12b, and is again introduced into the second separation tank 14, As a result, most of the paint contained in the collected liquid is sent to the second separation tank 14 via the float pump 13 and the transfer path 16 and discharged.

  Further, the collected liquid in the vicinity of the bottom portion on the downstream end side 12b of the first separation tank 12 containing almost no paint component is sent to the collected water supply tank 8 via the collected water supply path 17, and is stored in the collection chamber 4h. It flows down the inclined floor 7 and is used for collecting unpainted paint.

  As described above, according to the uncoated paint recovery device of the present invention, when the drainage channel 11, the return channel 20, and the first separating agent supply pipe 21 are disposed on the upstream end side 12 a of the first separation tank 12. At the same time, since the connecting portion for the float pump 13 and the collected water supply passage 17 is provided on the downstream end side 12b, a flow toward the downstream side 12b is generated, and a large amount of paint sludge that agglomerates and floats along this flow. The collected liquid can be collected on the downstream end side 12b, and these can be efficiently fed into the second separation tank.

  Further, the float pump 13 sucks air from the intake pipe 30 and mixes it in the collected liquid, and converts the air into fine bubbles by the rotation of the fins 31f. It is possible to prevent problems such as paint sludge being deposited and deposited. At this time, the gap d between the fins 31f and the casing 26 prevents a problem that the pump 13 is clogged.

  Furthermore, by supplying the separating agent from the second separating agent supply pipe to the collected water containing the high concentration paint sludge in the transfer path 16, the paint sludge is collected by stirring the fins 31f of the float pump 13. Even when it is redissolved in the liquid, the second separation tank 14 promotes the coagulation and floating of the paint sludge, so that the paint sludge can be reliably separated from the collected water within a short time. The paint that settles and adheres to the bottom of the two separation tanks 12 and 14 is almost eliminated, and the frequency of cleaning the tanks 12 and 14 can be reduced.

Next, experimental results for testing the effect of the technique for collecting an uncoated paint according to the present invention will be described.
300 tons of collected water is supplied to the first separation tank 12, 4 tons of industrial water is supplied to the second separation tank 14, and the concentration of the separating agent in the collected water of the first separation tank 12 is 2.5 ppm (industrial water). The separating agent was 750 grams per 300 tons). At this time, the content (solid content) of the polymer flocculant (diethyleneamine epichlorohydrin: molecular weight about 100,000) in the separating agent is 1%, and the content (solid content) of the charge neutralizing agent (urea melamine resin) is 5%. %.

As a comparative example, the first separating agent supply pipe 21 is operated, the content of the polymer flocculant (diethyleneamine epichlorohydrin: molecular weight about 100,000) (solid content) 1%, the charge neutralizing agent (urea melamine resin) A separating agent having a content (solid content) of 5% was further diluted with industrial water to an amount of 0.2% of the amount of uncoated paint per minute and supplied every minute. In addition, the painting pipe 1 was operated with the intake pipe 30 closed and the operation of the second separating agent supply pipe 33 stopped.
As a result, the paint sludge recovered by the recovery tank 37 was extremely small, and the water content of the recovered paint sludge was 90%.

On the other hand, as an example, the first separating agent supply pipe 21 is operated, the content of the polymer flocculant (diethyleneamine epichlorohydrin: molecular weight about 100,000) (solid content) 0.8%, the charge neutralizing agent A separating agent having a content (solid content) of (urea melamine resin) of 5% was further diluted with industrial water at an amount of 0.2% of the uncoated paint per minute and supplied every minute. Further, the intake pipe 30 is opened, and the second separating agent supply pipe 33 is operated to separate the separating agent having a polymer flocculant (diethyleneamine epichlorohydrin: molecular weight of about 100,000) content (solid content) of 0.2%. The amount of 0.2% of uncoated paint per minute was further diluted with industrial water and supplied every minute. At this time, the discharge rate of the float pump 13 was 300 liters / minute.
As a result, the paint sludge could be reliably recovered, and the water content of the recovered paint sludge was 60%.
From this result, the effectiveness of the present invention was confirmed.

In addition, this invention is not limited to the above embodiments. What has substantially the same configuration as the matters described in the claims of the present invention and exhibits the same operational effects belongs to the technical scope of the present invention.
For example, the type of the object to be coated is arbitrary. The paint is not limited to water-based paint.

  In particular, it is possible to efficiently collect uncoated paint in a painting facility for applying a water-based paint in a short time, and without increasing the size of the facility, reducing the labor for cleaning the separation tank. This is particularly effective for painting equipment that is frequently used.

Explanatory drawing which shows the whole structure outline | summary of the collection | recovery apparatus which concerns on this invention Front view of float type pump used in this equipment Top view of the float pump

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Painting equipment, 4 ... Painting booth, 8 ... Collected water supply tank, 12 ... 1st separation tank, 13 ... Float type pump, 14 ... 2nd separation tank, 15 ... Collection tank, 16 ... Transfer path, 21 ... 1st separating agent supply piping, 27 ... suction part, 28 ... cup, 28a ... upper surface opening, 30 ... intake pipe, 33 ... 2nd separating agent supply piping, 37 ... collection tank, W ... vehicle body.

Claims (4)

The unpainted paint discharged from the painting booth of the painting facility is collected by the collecting liquid, sent to the first separation tank, and the unpainted paint that has been agglomerated and floated in the first separation tank is transferred to the second through the transfer path by the transfer pump. An unpainted paint recovery device that feeds into the separation tank and collects the uncoated paint agglomerated in the second separation tank in the recovery tank, and supplies the separation agent to the first separation tank. A first separating agent supply pipe for providing the separation agent and a second separating agent supply pipe for supplying the separating agent to the second separation tank are provided in the second separation tank. Recovery device. The transfer pump is configured in a float type so that the suction opening is maintained at a substantially constant position below the liquid level, and the upper end of the transfer pump always protrudes and opens above the liquid level in the vicinity of the transfer pump, 2. The uncoated paint recovery apparatus according to claim 1, wherein an intake pipe having a lower end opening in a suction portion of the pump is disposed. The unpainted paint discharged from the painting booth of the painting facility is collected by the collecting liquid, sent to the first separation tank, and the unpainted paint that has been agglomerated and floated in the first separation tank is transferred to the second through the transfer path by the transfer pump. An uncoated paint collecting method that is fed to a separation tank and collects an uncoated paint aggregated in a second separation tank in a collection tank, wherein the first separation tank contains a polymer flocculant and charge neutralization In the second separation tank, the separation agent containing only the polymer flocculant among the polymer flocculant and the charge neutralizing agent is fed into the tank. An unpainted paint recovery method, characterized in that: The transfer pump is configured to be a float type so that the suction opening is maintained at a substantially constant position below the liquid level, and the upper end of the transfer pump always projects and opens above the liquid level in the vicinity of the transfer pump. The intake pipe having an opening in the suction part of the pump is disposed, and fine bubbles are mixed into the collected liquid in the transfer path by driving the transfer pump. Unpainted paint collection method.