JP2005211820A - Unapplied coating material recovery apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an unapplied coating material recovery apparatus in which coating material sludge is efficiently recovered by decreasing the use quantity of industrial water for collecting to reduce the water content in the coating material sludge coagulated and separated from the industrial water containing the coating material. <P>SOLUTION: The industrial water containing the coating material sludge in the large quantity is guided toward a collecting plate 72 direction of a float type coating material sludge collecting part 70 along a sludge fence 80, sucked from a conical industrial water discharge port 77 of the float type coating material sludge collecting part 70 and supplied to a 2nd separation vessel 13 in a state of being mixed with air. In the 2nd separation vessel 13, the coating material sludge is accelerated to be condensed and to be grown to increase the diameter and is floated and collected near the liquid surface of the 2nd separation vessel 13. The coating material sludge having large diameter is overflown from a weir 40 to be discharged to a collecting chamber 13c and further discharged from a discharge port 13d to a mesh wire gauze trough 17. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an unattached paint recovery apparatus suitable for a painting facility such as a painting booth used in an automobile production line or the like.

  Production lines such as automobiles have a painting process for painting the car body. In this painting process, paint is sprayed from a painting gun in the painting booth, and the paint is applied to the surface of the vehicle body. At this time, the paint that has not been applied to the vehicle body (uncoated paint) is caused to flow down the booth by an air flow that flows from the ceiling side of the painting booth toward the floor surface. On the floor of the painting booth, an uncoated paint collecting portion is formed along which the industrial water flows in a film shape along the inclined surface. The industrial water collects the uncoated paint. Industrial water is circulated in the booth, but part of it is discharged and sent to a separation device installed outside the painting booth, where it is separated from uncoated paint in a separation tank inside the separation device and recycled. The The reclaimed industrial water is supplied to the unpainted paint collecting part below the painting booth and reused.

  As a separation apparatus for separating uncoated paint as sludge from industrial water containing paint, one having two separation tanks is known. That is, the industrial water containing the paint discharged from the painting booth is sent to the first separation tank, separated from the paint, and returned to the unpainted paint collecting part. On the other hand, since the separated paint still contains a large amount of industrial water, it is sent to the second separation tank, where the aggregation of the paint sludge is further promoted and separated from the industrial water.

  Since the separation apparatus having the two separation tanks can sufficiently secure the coagulation time of the paint sludge by both of the separation tanks, the water content of the recovered paint sludge can be reduced. If the amount of water contained in the paint sludge is small, the handling becomes easy and the amount of waste is reduced.

  Patent Document 1 discloses a dewatering means for further dewatering the paint sludge separated in the second separation tank. A configuration is also disclosed in which the paint sludge discharged from the dewatering means is discarded and the industrial water separated by the dewatering means is supplied again to the first separation tank. And as a dehydration means, it is set as the combination of the storage tank and dehydrator which hold a water-containing paint sludge temporarily.

JP 7-148451 A

Although the separation of industrial water and paint by the apparatus disclosed in Patent Document 1 can reduce the amount of water in the paint sludge, the separation of the first separation tank, the second separation tank, and the storage tank is substantially achieved. The time to agglomerate the paint sludge is gained by the three tank structure.
That is, in order to earn the processing time of the paint sludge in the added storage tank, it is necessary to secure the amount of industrial water supplied to the coating booth during that time. For this reason, in order to enlarge the capacity | capacitance of a 1st separation tank and to suppress the raise of the coating content of the industrial water which circulates a system, it is also necessary to increase the amount of circulating water.
Each separation tank is regularly cleaned for maintenance. At that time, industrial water in the tank is treated as waste water. Although it is desirable to reduce the amount of industrial water used as wastewater from an environmental point of view, the amount of industrial water required between the water content of paint sludge and the amount of industrial water can be reduced by reducing the water content of paint sludge. Increasing and reducing the amount of industrial water has the problem that the water content of paint sludge increases.

  The present invention reduces the water content of paint sludge coagulated and separated from industrial water containing paint, even when the amount of industrial water for collecting unpainted paint in the coating equipment is reduced, and is efficient. It is an object of the present invention to provide an unattached paint recovery apparatus for a painting facility capable of recovering various paint sludge.

  In order to achieve the above object, an unattached paint recovery apparatus according to the present invention recovers a collected liquid containing an uncoated paint discharged from the inside of a painting facility, separates it into paint sludge and industrial water, and separates the separated industrial water. Is an unattached paint recovery device that returns to the painting facility. The unattached paint recovery device is configured to receive a first separation tank that receives the collected liquid from the interior of the painting facility, and paint sludge separated in the first separation tank. A second separation tank that receives a large amount of collected liquid via a branch flow path, and a collection member that collects the collected liquid containing a large amount of paint sludge and sends the collected liquid to the branch flow path is provided in the first separation tank. The collecting member is adjusted by a float so that the upper surface of the bottom part is directly below the liquid level, and a sludge fence is provided between the end of the open part into which the collecting liquid of the collecting member flows and the inner wall of the first separation tank. Was tethered.

Thus, by providing the collection member in which the upper surface of the bottom portion is directly below the liquid level in the first separation tank, it is possible to efficiently collect only the supernatant portion containing a large amount of paint sludge in the collected liquid. . In particular, by adjusting the distance between the upper surface of the bottom of the collecting member and the liquid level with a float, it is possible to reliably collect only necessary portions without being affected by fluctuations in the liquid level.

  In addition, air is refined (micro-air) by connecting an air suction pipe to the branch channel that sends the collected liquid containing a large amount of paint sludge collected in the first separation tank to the second separation tank. This facilitates the separation of paint sludge.

In addition, two sludge fences are prepared, and these sludge fences are arranged so as to spread in a fan shape from both ends of the open portion of the collecting member toward the inner wall of the first separation tank, so that the paint sludge can be collected efficiently. The

  Furthermore, the opening position of the return path for returning the industrial water separated in the second separation tank to the first separation tank is set to the wall surface side of the first separation tank opposite to the side on which the collection member is disposed. By doing so, the action of pushing the collected liquid containing a large amount of paint sludge to the collecting member side is exhibited, and the collected liquid containing a large amount of paint sludge can be collected efficiently.

  According to the non-attached paint recovery apparatus of the present invention, since the float type paint sludge collecting part and the second separation tank are provided and the aggregation of the paint sludge can be promoted, the capacity of the first separation tank is reduced. Can do. Moreover, the residence time of collected water can be shortened. That is, the facility area can be reduced, the maintainability can be improved, and the amount of industrial water discarded as waste water can be reduced.

  In addition, since the depth of the upper surface of the bottom plate of the collecting member is adjusted to be directly below the liquid level, air is drawn simultaneously when suctioning industrial water containing paint sludge from a funnel-shaped discharge port. Becomes microbubbles and can promote the separation of paint sludge from industrial water.

  Hereinafter, the apparatus of the present invention will be described in detail with reference to the drawings. 1 is an overall configuration diagram of an unattached paint collecting apparatus according to the present invention, FIG. 2 is a plan view of a float type paint sludge collecting member according to the present invention, FIG. 3 is a side view of the collecting member, and FIG. It is sectional drawing of the pump which sends the industrial water containing paint sludge from the 1st separation tank to the 2nd separation tank.

  The separation device 1 is arranged at the lower part of the painting facility 2. The painting facility 2 is provided with a painting device 3 for spraying paint onto the workpiece W (here, an automobile body). The uncoated paint that could not be applied to the workpiece W is collected in industrial water, discharged from the lower part of the coating facility 2, and stored in the separation device 1. The industrial water regenerated by the separator 1 is returned to the coating facility 2 and reused.

  The painting facility 2 is composed of a painting booth 4 capable of accommodating the workpiece W and a painting device 3 including a robot 5 equipped with a spray gun 5a. The painting equipment 2 is placed on the carriage W1 and transported in the painting chamber 4c of the painting booth. The paint is sprayed from the spray gun 5a onto the workpiece W to be applied.

  The painting booth 4 is separated from the static pressure chamber 4a by a static pressure chamber 4a provided in the upper part, an air supply duct 4b for supplying air for allowing the uncoated paint to flow down to the static pressure chamber 4a, and a punching metal 4f. The coating chamber 4c, the lower collection chamber 4e separated from the coating chamber 4c by the punching metal 4d, and the collected water (industrial water including uncoated paint) formed in the length direction of the collection chamber 4e. And the discharge port 7 which discharges the collected water which overflowed the collected water storage tank 8 from the collection chamber 4e. .

  On the other hand, the separation device 1 collects industrial water in which a separating agent is dispersed in advance in a collection water storage tank in order to collect the uncoated paint that has flowed down by the uncoated paint flowing down air in the collection chamber 4e of the coating booth 4. 8, a second separation tank 13 to which a part of industrial water stored in the first separation tank 12 is sent, and a float-type paint sludge trap disposed in the first separation tank 12. The collecting member 70 is a main part.

  The separator 1 includes a pump 14 and a branch channel 15 for sending industrial water containing paint sludge from the float type paint sludge collecting member 70 to the second separation tank 13, and a paint content from the second separation tank 13 to the first separation tank 12. A return path 16 for sending industrial water with reduced amount of water, and a mesh wire mesh rod 17 which is a storage tank for draining and storing paint sludge discharged from the second separation tank 13.

  A supply path 18 is disposed from the first separation tank 12 toward the collected water storage tank 8, and a pump 19 is provided in the supply path 18. The second separation tank 13 is provided with a collection chamber 13c for overflowing and collecting industrial water containing paint sludge by the weir 40, and the collection chamber 13c and the mesh wire mesh rod 17 are connected by a discharge pipe 13d. Communicate.

  One end of the supply path 18 is connected to the lower part of the side wall 12 a in which the float type paint sludge collecting member 70 in the first separation tank 12 is arranged. In the vicinity of the side wall 12 b facing the side wall 12 a of the first separation tank 12, an opening of the discharge path 11 communicating with the drain port 7 and an opening of the return path 16 are juxtaposed above the liquid surface of the collected liquid. Has been.

  The first separation tank 12 stores, for example, 300 tons of industrial water at the beginning of the operation of the painting facility 2. The capacity of the first separation tank 12 varies depending on the size of the coating booth 4, the amount of collected water flowing down the inclined surface 6, or the time required to separate the paint from the industrial water determined by the separating agent and other conditions. However, in this example, the capacity of the first separation tank 12 is designed so that the residence time of industrial water in the first separation tank 12 is substantially less than half of the time required for the separation. Has been.

  If the residence time is shortened, there is a possibility that the paint sludge that could not be condensed in the first separation tank 12 may increase. However, the paint sludge is aggregated by the float type paint sludge collecting section 70 and the second separation tank 13 described later. Therefore, the capacity | capacitance of the 1st separation tank 12 can be reduced and the residence time of collected water can be shortened. Thereby, it becomes possible to reduce an installation area, improve maintainability, and reduce the quantity of industrial water discarded as waste water.

  As shown in FIGS. 2 and 3, the float-type paint sludge collecting member 70 is a box-type collection whose one side is opened by a bottom plate 71 and side plates 71 a, 71 b, 71 c formed on three sides of the bottom plate 71. And collecting plates 72, 72 extending obliquely outward from the upper ends of the side plates 71a, 71c, and hook members 73, 73 equipped at the distal ends of the collecting plates 72, 72 Have.

  L-type support members 74, 74, 74 are provided in the vicinity of the center portions of the side plates 71 a, 71 b, 71 c, and float support is provided with screw holes inside the tip portions of the L-type support members 74. Part 74a is attached. A rod-like screw 75a supported by the float 75 is screwed to each float support portion 74a. Hook members 76 and 76 are attached to the side direction ends of the side plates 71a and 71b.

  A funnel-shaped (conical) industrial water discharge port 77 is formed at a substantially central portion of the bottom plate 71 and is connected to a discharge pipe 78. The discharge pipe 78 is provided with an air suction pipe 79 whose tip is viewed on the liquid surface. The air sucked from the air suction pipe 79 also contributes to the efficiency of mixing industrial water containing paint sludge.

  Further, hook members 12c and 12c are attached to the side wall 12a of the first separation tank 12, and hook members 12d and 12d are attached to the side wall 12b, respectively, and the hook members 76 and 76 of the float type paint sludge collecting member 70 are provided. The hook members 12 c and 12 c and the hook members 73 and 73 are connected to the hook members 12 d and 12 d through the paint sludge fence 80.

  Then, as shown in FIG. 3, the distance between the liquid level of the first separation tank 12 and the upper surface of the bottom plate 71 by the float 75 so that the upper surface of the bottom plate 71 of the float type paint sludge collecting member 70 is directly below the liquid level ( (Depth) is adjusted. This depth is preferably 10 mm to 30 mm. If the depth is less than 10 mm, the amount of air sucked will be too large and the efficiency of liquid feeding to the second separation tank will be reduced. The amount increases, which is not preferable.

  As described above, by adjusting the depth of the upper surface of the bottom plate 71 directly below the liquid level, air is drawn simultaneously when the industrial water containing the paint sludge is sucked from the conical industrial water discharge port 77, and the drawn air Becomes microbubbles and can promote the separation of paint sludge from industrial water.

  Further, as shown in the sectional view of FIG. 4, the discharge pipe 78 is connected to the casing 22 of the pump 14. A rotating body 26 is connected to a rotating shaft 25 of a motor 24 housed in the casing 22. The rotating body 26 is formed with fins 26a, and the industrial water containing the paint sludge sucked from the conical industrial water discharge port 77 is sent to the discharge pipe 27 by the rotating body 26 and is shown in FIG. Then, it is transferred to the second separation tank 13 through the separation channel 15. At this time, since the industrial water containing the air and the paint sludge sucked into the casing 22 from the industrial water discharge port 77 through the discharge pipe 78 is mixed, the separation of the paint sludge from the industrial water is further promoted.

  In this embodiment, the discharge pipe 78 is extended outside the first separation tank and the pump 14 is arranged. However, a submersible pump is arranged in the first separation tank, and the discharge pipe 78 and the diversion flow are connected to the submersible pump. The form which connects the path | route 15 may be sufficient.

  Further, the gap d between the casing 22 of the pump 14 and the fin 26a is preferably about 5 mm. By providing such a gap, it is possible to prevent the rotating body 26 and the casing 22 from being fixed by high-viscosity paint sludge and causing malfunctions. Of course, even if a pump having a gap d of 5 mm or less between the casing 22 and the fin 26a is used, there is no particular problem if regular maintenance is performed. The same applies to the submersible pump.

  The second separation tank 13 is installed to efficiently separate and discard the paint sludge. The volume may be about 1/10 to 1/100 that of the first separation tank 12 so as not to significantly increase the amount of industrial water used. The open end of the diversion channel 15 is provided in the vicinity of the side wall 13a of the second separation tank 13 and is located above the liquid level. A return path 16 is connected to a lower portion of the side wall 13b of the second separation tank 13. Further, as described above, the weir 40 is provided near the liquid surface of the side wall 13b, and the paint sludge discharged to the collection chamber 13c through the weir 40 is discharged to the mesh wire mesh rod 17 through the discharge pipe 13d.

  Since the industrial water containing the paint sludge supplied to the second separation tank 13 falls from the opening of the branch channel 15 away from the liquid surface, the air and the industrial water are further mixed, and the separation of the paint sludge is promoted. .

  Here, a procedure for regenerating industrial water containing uncoated paint will be described. Industrial water containing uncoated paint flows into the first separation tank 12 from the discharge port 7 of the coating booth 4 through the discharge path 11. In the first separation tank 12, the uncoated paint captured in the industrial water is aggregated as paint sludge by the action of the added dispersant and floats on the liquid surface. For this reason, the ratio of the industrial water which hardly contains an uncoated paint increases in the bottom part of the 1st separation tank 12, On the other hand, the ratio of the industrial water which contains many paint sludges increases in the liquid level vicinity.

  The industrial water containing a large amount of the paint sludge is guided along the sludge fence 80 in the direction of the collecting plate 72 of the float type paint sludge collecting part 70, and the conical industrial water discharge port of the float type paint sludge collecting part 70. 77 is sucked by the pump 14 and supplied to the second separation tank 13 while being mixed with air. In the second separation tank 13, since the condensation of the paint sludge is further promoted, the paint sludge grows to increase the particle size, and floats and collects near the liquid surface of the second separation tank 13. The paint sludge having a large particle size overflows from the weir 40 and is discharged to the collection chamber 13c, and is further discharged to the mesh wire mesh rod 17 through the discharge pipe 13d.

  On the other hand, since the industrial water near the bottom of the second separation tank 13 contains almost no paint sludge due to the promotion of the coagulation of the paint sludge, this industrial water is sent to the first separation tank via the return path 16 and the side wall 12b. Drop on the liquid surface from nearby.

  The non-attached paint recovery apparatus of the painting equipment of the present invention can grow paint sludge efficiently and with a large particle size by the above procedure, so that the separation tank can be miniaturized and the amount of industrial water used is Even when the amount of water is reduced, the water content of the paint sludge can be reduced and the paint sludge can be efficiently recovered. For example, even when the capacity of the first separation tank 12 is 300 tons, the capacity of the second separation tank is 4 tons, and the residence time of industrial water in the first separation tank 12 is about 4 minutes, the water content of the paint sludge is 60 % Or less.

  Accordingly, the unattached paint recovery device for the painting equipment of the present invention can reduce both the amount of industrial water used and the amount of paint waste, and can therefore be suitably incorporated in automobile production lines and the like.

Overall configuration diagram of an unattached paint recovery apparatus according to the present invention The top view of the float type paint sludge collection member concerning the present invention Side view of the collecting member Sectional view of a pump that feeds industrial water with paint sludge from the first separation tank to the second separation tank

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Separation device, 2 ... Painting equipment, 3 ... Painting device, 4 ... Painting booth, 4a ... Static pressure chamber, 4b ... Air supply duct, 4c ... Painting chamber, 4d, 4f ... Punching metal, 4e ... Collection chamber DESCRIPTION OF SYMBOLS 5 ... Coating robot, 5a ... Spray gun, 6 ... Inclined surface, 7 ... Discharge port, 8 ... Collected water storage tank, 11 ... Discharge path, 12 ... First separation tank, 12a, 12b ... First separation tank Side wall, 12c, 12d ... hook, 13 ... second separation tank, 13a, 13b ... side wall of second separation tank, 13c ... collection chamber, 13d ... discharge pipe, 14 ... pump, 15 ... branching path, 16 ... return path DESCRIPTION OF SYMBOLS 17 ... Mesh wire mesh fence, 18 ... Supply path, 19 ... Pump, 22 ... Motor, 26 ... Rotating body, 26a ... Fin, 40 ... Weir, 70 ... Float type paint sludge collection member, 71 ... Bottom plate, 71a, 71b 71c ... side plate, 72 ... collection plate, 73 ... hook material, 7 DESCRIPTION OF SYMBOLS L-type support member, 74a ... Float support part, 75 ... Float, 75a ... Bar-shaped screw, 76 ... Hook member, 77 ... Industrial water discharge port, 78 ... Discharge pipe, 79 ... Air suction pipe, 80 ... Paint sludge fence , W ... Work, W1 ... Dolly.

Claims (5)

A collected liquid containing uncoated paint discharged from the painting facility is collected and separated into paint sludge and industrial water, and the separated industrial water is returned to the painting facility again. The paint deposit recovery device includes a first separation tank that receives the collected liquid from the coating facility, a second separation tank that receives the collected liquid containing a large amount of the paint sludge separated in the first separation tank through the branch channel, and And a collecting member that collects the collected liquid containing a large amount of paint sludge and sends it to the branch channel, and the collecting member floats so that the upper surface of the bottom portion is directly below the liquid level. A sludge fence is anchored between the end of the open part into which the collected liquid of the collecting member flows and the inner wall of the first separation tank. 2. The uncoated paint recovery apparatus according to claim 1, wherein the coating facility is provided with a discharge path for transferring a collected liquid containing uncoated paint toward the first separation tank, and the first separation tank is provided. Is provided with a supply path for supplying separated industrial water to the coating facility, the collecting member is formed in a box shape and a funnel-shaped discharge part connected to the branch channel is provided at the bottom, and the second separation The tank is provided with a return path for returning the separated industrial water to the first separation tank, and further provided with a storage tank for draining and storing the water-containing paint sludge transferred from the second separation tank downstream of the second separation tank. An unattached paint recovery device characterized by being made. 3. The unattached paint recovery apparatus according to claim 1, wherein an air suction pipe is connected to the branch flow path. 3. The non-attached paint recovery apparatus according to claim 1 or 2, wherein the sludge fence is arranged so as to spread in a fan shape from both ends of the opening of the collecting member toward the inner wall of the first separation tank. An unattached paint recovery device characterized by the above. The non-attached paint recovery apparatus according to claim 1 or 2, wherein the return path for returning the industrial water separated in the second separation tank to the first separation tank includes a side on which the collecting member is disposed. Is a non-attached paint recovery device that is arranged on the wall surface side of the first separation tank on the opposite side.