JP2012041590A - Foreign matter-removing system in treatment tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foreign matter-removing system in a treatment tank capable of removing efficiently and inexpensively extremely fine foreign matter contained in treatment liquid in the treatment tank.SOLUTION: This foreign matter-removing system includes: a recovery part for upper and middle layers, for recovering treatment liquid containing foreign matter having a small specific gravity; a second cyclone device 23 for separating the treatment liquid from the upper and middle layers into filtrate and foreign matter; and a treatment liquid filtration device 50 for filtering further the filtrate from the second cyclone device 23 and refluxing it into the treatment tank. The treatment liquid filtration device 50 includes: a housing 52 communicated with a filtrate discharge port 23b of the second cyclone device 23 through a supply pipe 54 comprising a straight line pipe; a lid member 64 mounted on the upper surface of the housing 52; and a brush 66 mounted on the lid member 64 detachably and coaxially with the supply pipe 54.

Description

  The present invention relates to a technique for removing foreign matter in a tank in a pretreatment tank, an electrodeposition tank, or the like in an automobile painting process.

  In automobile press processes and welding processes, iron powder, fibers, welding sealers, press oil, and the like adhere to the vehicle body, and these foreign substances become obstacles to painting in the subsequent painting process. Therefore, in the degreasing process, which is the first process of the painting process, the body is immersed in the treatment liquid in a degreasing tank and a washing tank to remove the foreign matter.

  As a conventional example of the foreign matter removal method, as described in Patent Document 1, the immersed vehicle body is moved against the counterflow of the processing liquid, and the foreign matter is removed using ultrasonic waves and high-pressure jet of cleaning liquid. The method of doing is mentioned. The foreign matter removed from the vehicle body is extracted together with the cleaning liquid from the extraction port provided at the bottom of the cleaning tank, the foreign matter is separated from the cleaning liquid by the cleaning liquid regenerating device, and the cleaning liquid is reused.

  Further, Patent Document 2 discloses that the foreign matter settled at the bottom of the collection tank in the coating pretreatment apparatus is separated into a treatment liquid in which the foreign matter is diluted and a treatment liquid in which the foreign matter is concentrated by a liquid cyclone. Is returned to the recovery tank and reused as a processing liquid, and the latter processing liquid is further described as a technique for separating the processing liquid and foreign substances by a conveyor filter.

JP 2004-162157 A JP 11-47666 A

  The cleaning liquid in the cleaning tank is mixed with various foreign substances having different specific gravities, and some of them settle to the bottom of the tank, while the rest floats in the middle or upper layer. For example, a relatively large iron powder having a large specific gravity settles on the bottom of the tank, but a very fine iron powder floats in the cleaning liquid together with fiber waste. Therefore, according to the technique of Patent Document 1, large iron powder and the like can be taken out of the washing tank together with the cleaning liquid, but it becomes difficult to take out very small foreign matters such as iron powder and fiber scraps. There is a possibility that these fine foreign substances adhere. The same applies to the technique disclosed in Patent Document 2. Since the processing liquid containing fine foreign matter is returned to the recovery tank and used as the processing liquid, there is a possibility that fine foreign matter may adhere to the vehicle body.

  The present invention was created to solve the above-described problems, and provides a foreign matter removal system in a treatment tank that can efficiently remove very fine foreign matters contained in the treatment liquid in the treatment tank at low cost. The purpose is to do.

  In order to solve the above problems, a foreign matter removal system in a treatment tank according to the present invention relates to a treatment tank transported in a state in which a workpiece is immersed in a treatment liquid, and is a system that removes foreign matters in the treatment liquid of the treatment tank. The upper middle layer recovery unit is formed at one end side of the processing tank near the workpiece entry tank and in the middle of the tank height, and collects the processing liquid containing foreign substances having a small specific gravity, and the processing from the upper middle layer recovery unit. The upper middle-layer cyclone device that separates the liquid into filtrate and foreign matter and discharges the filtrate from the upper filtrate outlet formed on the axis of the centrifuge, and the filtrate from the upper-middle cyclone device A treatment liquid filtration device for further filtering and recirculating to the treatment tank, wherein the treatment liquid filtration device comprises a straight tube communicating with the filtrate discharge port of the upper-middle cyclone device at the lower surface supply hole The supply pipe is connected and the upper A housing to which a discharge pipe for filtrate is connected to the mouth; a lid member that is detachably attached to the upper surface of the housing; and a brush that is detachably attached to the lid member coaxially with the supply pipe. The swirling flow generated in the centrifugal separation unit of the upper-middle cyclone device is transmitted to the inside of the housing through the supply pipe, and foreign matter is collected by the brush located at the center of the swirling flow.

  A foreign substance having a relatively small specific gravity in the treatment tank tends to float on the upper middle layer of the tank. Therefore, by providing the upper middle layer recovery part at one end side of the processing tank and in the middle of the tank height, it is possible to efficiently recover fine foreign matters having a small specific gravity. And this invention is excellent in the filtration efficiency of a process liquid, since the collect | recovered fine foreign material is centrifuged with the cyclone apparatus for upper middle layers, the filtrate is further filtered with a process liquid filtration apparatus, and is recirculated | refluxed to a process tank. In order to collect fine foreign substances in the treatment liquid filtration device, it uses a swirl flow generated in the centrifugal separation part of the upper-middle cyclone device. In addition, foreign matters can be efficiently removed at low cost. Since the brush is detachably attached to the lid member, the brush maintenance work is facilitated.

  Further, the foreign matter removal system in the treatment tank according to the present invention is formed at the bottom of the tank near the work entry tank of the treatment tank and the bottom layer collection unit for collecting the treatment liquid containing foreign matter having a large specific gravity, A bottom layer cyclone device that separates the processing liquid from the bottom layer recovery unit into filtrate and foreign matter, and the filtrate discharged from the bottom layer cyclone device is discharged from the workpiece at a position in the middle of the tank height. A plurality of second processing liquid discharge nozzles provided so as to face the tank and to be directed to the workpiece, the filtrate discharged from the upper and middle layer cyclone device is directed to the work inlet tank side at the tank bottom and the tank. It sprays by the some 1st process liquid discharge nozzle provided so that it may face to the bottom face of this.

  According to the foreign matter removal system, the flow of the processing liquid in the processing tank is changed in the workpiece conveyance direction by discharging from the second processing liquid discharge nozzle in the upper middle layer portion, and by the discharge from the first processing liquid discharge nozzle in the bottom layer portion. Circulating flow in the direction opposite to the conveying direction can be achieved, and foreign matter can be efficiently accumulated by specific gravity by the bottom layer recovery unit, the bottom layer recovery unit located in the middle of the tank height, and the upper middle layer recovery unit.

  Further, in the foreign matter removal system in the treatment tank according to the present invention, the upper wall surface of the wall of the treatment tank closer to the workpiece entry tank is formed with the upper wall surface deeper than the lower wall surface, the upper middle layer recovery unit, the bottom layer recovery unit Each of the upper wall surface and the lower wall surface are provided in front of each other. A flat plate-like inclined plate is provided around the upper end of the lower wall surface so as to extend upward and toward the workpiece discharge tank, and collides with the lower wall surface. Of the foreign matter in the processing liquid dispersed upward, a foreign matter having a low specific gravity is collected by the upper middle layer recovery unit along the inclined plate, and a high specific gravity foreign matter is blocked by the inclined plate and the bottom layer recovery unit. It collects by.

  According to such a foreign substance removal system, the inclined plate has a filter function of separating foreign substances into light and heavy ones, and foreign substances can be divided and accumulated by specific gravity with a simple structure.

  Further, in the foreign matter removal system in the treatment tank according to the present invention, at least one of the upper and middle layer cyclone devices and the bottom layer cyclone device is provided in parallel between two or more cyclone devices provided in parallel. Thus, by alternately switching between the discharge timing of the filtrate and the discharge timing of the precipitation solution, the treatment solution in the treatment tank is always taken out as a filtration solution and a precipitation solution by any one of the cyclones.

  According to such a foreign matter removal system, since the processing liquid in the treatment tank is always taken out as a filtrate and a precipitation liquid by any one of the cyclone apparatuses, the system is excellent in operation efficiency of foreign matter removal.

  Further, in the foreign matter removal system in the treatment tank according to the present invention, the precipitation liquid discharged from the upper and lower layer cyclone device and the lower layer cyclone device is charged as the treatment liquid, and the foreign matter in the treatment liquid is contained by a built-in screw conveyor device. A separation tank that squeezes and discharges to the outside, and a cyclone device for a separation tank that separates the treatment liquid from the separation tank into a filtrate and a precipitate, and the filtration separated by the cyclone device for the separation tank The liquid and the precipitation liquid are returned to the treatment tank and the separation tank, respectively.

  According to such a foreign matter removal system, the precipitate discharged from the upper and middle layer cyclone device and the bottom layer cyclone device is further separated into a filtrate and foreign matter using the separation tank and the cyclone apparatus for the separation tank, and the filtrate is separated. Since it returns to the treatment tank, it becomes a foreign matter removal system with almost no loss of treatment liquid.

  ADVANTAGE OF THE INVENTION According to this invention, the very fine foreign material contained in the processing liquid in a processing tank can be efficiently removed at low cost.

It is a block diagram of the foreign material removal system in the processing tank which concerns on this invention, and shows the electrodeposition tank which is a processing tank by a side view. It is a top view of the electrodeposition tank which concerns on this invention. It is AA sectional drawing in FIG. It is BB sectional drawing in FIG. It is FF sectional drawing in FIG. It is side sectional drawing of a cyclone apparatus and a process liquid filtration apparatus. It is an external view which shows an example of the manufacturing method of a brush. It is EE sectional drawing in FIG.

  In an automobile painting factory, a pretreatment process for performing degreasing or rinsing treatment of a work body W (see FIG. 1), and an electrodeposition process for electrically applying an anti-corrosion electrodeposition paint to the vehicle body W. In each of these processes, the vehicle body W is immersed in the processing liquid in the processing tank. The case where the foreign matter removal system in the treatment tank according to the present invention is applied to the electrodeposition tank in the electrodeposition process will be described below.

  As shown in FIGS. 1 and 2, a transport conveyor 100 for the vehicle body W is provided above the electrodeposition tank 1 along the longitudinal direction of the electrodeposition tank 1. The vehicle body W is immersed in the treatment liquid in the electrodeposition tank 1 from one end side in the longitudinal direction of the electrodeposition tank 1 while being placed on the hanger 101 of the transport conveyor 100, and is transported in the longitudinal direction. It is lifted from and transported to the next process.

"Electrodeposition tank 1 (treatment tank)"
The electrodeposition tank 1 has a first hopper 3 (bottom layer recovery part) that is formed at one end side near the body entrance tank and at the bottom of the tank and mainly collects processing liquid containing foreign matter having a large specific gravity. A second hopper 27 (upper middle layer collecting portion) is formed on one end side closer to the tank and in the middle of the tank height, and mainly collects a processing liquid containing a foreign substance having a small specific gravity.

  The vertical wall surface at one end of the electrodeposition tank 1 near the vehicle body tank is formed as a wall surface having a step whose upper wall surface 1b is deeper than the lower wall surface 1c. A stepped floor surface 1d is formed between the upper wall surface 1b and the lower wall surface 1c. The first hopper 3 is composed of a region in front of the lower wall surface 1c, and the second hopper 27 is composed of a region in front of the upper wall surface 1b. Specifically, a flat plate-like inclined plate 3c is provided around the upper end of the lower wall surface 1c so as to extend over the entire width of the electrodeposition tank 1 toward the vehicle body discharge tank side and upward. A region surrounded by the bottom wall 1c, the bottom of the electrodeposition tank 1, and the side walls on both sides of the electrodeposition tank 1 constitutes a first hopper 3 that accumulates foreign matter having a relatively large specific gravity. In addition, a region surrounded by the inclined plate 3c, the stepped floor surface 1d, the upper wall surface 1b, and the side walls on both sides of the electrodeposition tank 1 constitutes a second hopper 27 that accumulates foreign matter having a relatively low specific gravity. A discharge port 3a for discharging the foreign matter accumulated in the first hopper 3 together with the processing liquid is opened at the lower center of the lower wall surface 1c in the width direction, and is accumulated in the second hopper 27 at the lower center of the upper wall surface 1b in the width direction. A discharge port 27a for discharging the foreign matter together with the processing liquid is provided.

  An inclined surface 4 is formed near the end of the electrodeposition tank 1 on the vehicle body exit side, and a preliminary tank 2 is formed. The preliminary tank part 2 includes a vertical wall surface 2b at the other end in the longitudinal direction of the electrodeposition tank 1, a bottom surface part 2a, a partition wall 2d formed as a vertical wall passing around the upper end of the inclined surface 4, and the electrodeposition tank 1 It consists of the tank of the area | region enclosed by the side wall on both sides. The upper end of the partition wall 2d is located above the upper end of the inclined surface 4 and below the liquid surface of the processing liquid, and the processing liquid can flow with respect to the partition wall 2d above the partition wall 2d.

  On the bottom surface 1 a of the electrodeposition tank 1, a plurality of upright plates 6 extending in the longitudinal direction of the electrodeposition tank 1 are formed at equal intervals in the width direction of the electrodeposition tank 1. One end of each upright plate 6 is positioned in front of the first hopper 3 without extending to the lower wall surface 1c. The other end of each upright plate 6 extends to the upper end of the inclined surface 4. The upright plate 6 has a function of rectifying the processing liquid in the electrodeposition tank 1.

  As shown in FIGS. 1 and 3, a first treatment liquid supply pipe 7 extending in the longitudinal direction of the electrodeposition tank 1 is provided at the lower part of one side wall of the electrodeposition tank 1. The first treatment liquid supply pipe 7 includes two pipes, for example, a pipe along the bottom surface 1 a of the electrodeposition tank 1 and a pipe along the inclined surface 4 of the electrodeposition tank 1. A plurality of first branch pipes 8 extending to the other side wall are provided in the first treatment liquid supply pipe 7 at intervals in the longitudinal direction of the electrodeposition tank 1. In the present embodiment, five first branch pipes 8 are arranged along the bottom surface 1 a of the electrodeposition tank 1 and two along the inclined surface 4. Five first branch pipes 8 along the bottom surface 1 a are arranged at equal intervals in the longitudinal direction of the electrodeposition tank 1. As shown in FIG. 4, the 1st branch pipe 8 is extended in the width direction of the electrodeposition tank 1 in the aspect mounted in the upper edge of the standing board 6, for example.

  As shown in FIGS. 3 and 4, each first branch pipe 8 is provided with a plurality of first processing liquid discharge nozzles 9 for discharging a processing liquid. The first treatment liquid discharge nozzle 9 is disposed in the first branch pipe 8 so as to be located at the center of the interval between the adjacent upright plates 6 or at the center of the interval between the upright plate 6 and the side wall of the electrodeposition tank 1. The first treatment liquid discharge nozzle 9 has its discharge port facing in the opposite direction to the vehicle body conveyance direction, that is, toward the vehicle body entrance tank side and obliquely downward so as to be directed to the bottom surface 1 a of the electrodeposition tank 1.

  As shown in FIGS. 1, 2, and 5, a branch pipe 11 extending in the longitudinal direction of the electrodeposition tank 1 is provided around the upper edge of each side wall of the electrodeposition tank 1. Each branch pipe 11 branches from a second processing liquid supply pipe 10 routed outside the electrodeposition tank 1. Each branch pipe 11 has a plurality of second branch pipes 12 that hang down to the middle in the height direction of the electrodeposition tank 1 along the side wall of the electrodeposition tank 1 at intervals in the longitudinal direction of the electrodeposition tank 1. Branch piping.

  Each second branch pipe 12 is provided with a plurality of second processing liquid discharge nozzles 13 for discharging the processing liquid. The second treatment liquid discharge nozzle 13 has a discharge port that is horizontal at a position in the middle of the tank height of the electrodeposition tank 1, faces the vehicle body discharge tank side, and is located inside the electrodeposition tank 1, that is, the vehicle body W. It is attached to the 2nd branch pipe 12 so that it may face.

  As described above, the flow of the processing liquid in the electrodeposition tank 1 is in the direction of conveying the vehicle body by discharging from the second processing liquid discharge nozzle 13 in the upper middle layer portion, and the vehicle body is discharged in the bottom layer portion by discharging from the first processing liquid discharge nozzle 9. The direction is opposite to the transport direction.

“First Cyclone Device 18 (Cyclone Device for Bottom Layer), Second Cyclone Device 23 (Cyclone Device for Upper Middle Layer)”
As shown in FIG. 1, one end of a first suction pipe 20 is attached to the discharge port 3 a of the first hopper 3 outside the electrodeposition tank 1. The other end of the first suction pipe 20 is bifurcated and attached to each waste liquid supply port 18a of a pair of first cyclone devices 18 (bottom layer cyclone devices) provided in parallel. The first suction pipe 20 is provided with a pump 17, and an on-off valve V 1 is provided on the upstream side of the pump 17, and on-off valves V 2 and V 3 are provided between the bifurcated branch point and each waste liquid supply port 18 a. It is done. A portion of the first suction pipe 20 between the discharge port 3a and the on-off valve V1 communicates with an opening 2c opened on the bottom surface 2a of the preliminary layer 2 via a third suction pipe 80. A pump 81 is interposed in the third suction pipe 80, and on-off valves V24 and V25 are provided on the upstream side and the downstream side of the pump 81, respectively.

  A bifurcated end of the second processing liquid supply pipe 10 is attached to the filtrate outlet 18b of each first cyclone device 18 respectively. On-off valves V4 and V5 are provided between each filtrate outlet 18b and the bifurcated branch point. The other end of the second processing liquid supply pipe 10 is formed as a pair of branch pipes 11 as described above. A heat exchanger 14 is interposed in the second processing liquid supply pipe 10, and on-off valves V 6 and V 7 are provided on one end side and the other end side of the second processing liquid supply pipe 10 with the heat exchanger 14 interposed therebetween.

  The precipitation liquid discharge port 18 c of each first cyclone device 18 communicates with one end of the foreign matter discharge pipe 31. Specifically, one end of the foreign matter discharge pipe 31 is formed as a bifurcated pipe 31a, and one end of the bifurcated pipe 31a is further bifurcated and attached to the precipitation liquid discharge port 18c of each first cyclone device 18. Yes. On-off valves V8 and V9 are provided between the bifurcated branch point and each sediment discharge port 18c.

  One end of the second suction pipe 21 is attached to the discharge port 27 a of the second hopper 27 outside the electrodeposition tank 1. The other end of the second suction pipe 21 is bifurcated and attached to each waste liquid supply port 23a of a pair of second cyclone devices 23 (upper middle cyclone device) provided in parallel. A pump 22 is interposed in the second suction pipe 21, and on-off valves V 10 and V 11 are provided on the upstream side of the pump 22, and an on-off valve V 12 is provided between the pump 22 and the bifurcated branch point. On-off valves V13 and V14 are provided between the waste liquid supply ports 23a.

  The filtrate outlet 23b of each second cyclone device 23 communicates with a treatment liquid filtration device 50 described in detail later via a supply pipe 54. A bifurcated end of the filtrate discharge pipe 24 is attached to the outlet 55 of each treatment liquid filtration device 50. On-off valves V15 and V16 are provided between each delivery port 55 and the bifurcated branch point. The other end of the filtrate discharge pipe 24 is also bifurcated, and one of the branches is drawn into the electrodeposition tank 1 and communicates with the first treatment liquid supply pipe 7. The other branch (branch pipe 28) is connected to two branch pipes 29 standing on both sides of the discharge tank end of the electrodeposition tank 1. Each branch pipe 29 is provided with a plurality of cleaning nozzles 30 directed to the vehicle body W in the tank.

  Further, a heat exchanger 25 is interposed in the filtrate discharge pipe 24, and an on-off valve V17 is provided between the bifurcated branch point near one end of the filtrate discharge pipe 24 and the heat exchanger 25, and the filtrate discharge pipe. On-off valves V18 and V19 are provided between the bifurcated branch point near the other end of 24 and the heat exchanger 25. An on-off valve V20 is provided between the bifurcated branch point near the other end of the filtrate discharge pipe 24 and the first treatment liquid supply pipe 7.

  The precipitation liquid discharge port 23 c of each second cyclone device 23 communicates with one end of the foreign matter discharge pipe 31. Specifically, as described above, one end of the foreign matter discharge pipe 31 is formed as a bifurcated pipe 31a, and the other end of the bifurcated pipe 31a is further bifurcated, and then the precipitation liquid discharge port of each second cyclone device 23 is formed. 23c. On-off valves V21 and V22 are provided between the bifurcated branch point and each sediment discharge port 23c.

  Here, as the first cyclone device 18 and the second cyclone device 23, known cyclone devices can be applied. FIG. 6 shows the internal structure of the second cyclone device 23. The housing of the second cyclone device 23 has a cylindrical shape, and a cylindrical space portion 15 is connected to the upper portion of the second cyclone device 23. The inverted cone is connected to the cylindrical space portion 15 and the space is gradually reduced in diameter downward. A trapezoidal space 16 is formed. The cylindrical space portion 15 and the inverted frustoconical space portion 16 constitute a centrifugal separation portion 38. A cylindrical precipitation portion 19 having a diameter larger than the diameter of the lower end of the inverted frustoconical space portion 16 is formed coaxially with the centrifugal separation portion 38 at the lower portion of the inverted frustoconical space portion 16.

  The waste liquid supply port 23 a is opened on the side surface of the cylindrical space 15 so that the axis thereof is orthogonal to the axis of the centrifugal separator 38. At the upper end of the cylindrical space 15, the filtrate outlet 23 b is opened coaxially with the centrifugal separator 38. At the lower end of the cylindrical precipitation portion 19, the precipitation liquid discharge port 23 c is opened coaxially with the cylindrical precipitation portion 19.

  As described above, the processing liquid containing the foreign matter supplied into the second cyclone device 23 from the waste liquid supply port 23a is separated by the cyclone (swirl flow) generated in the centrifugal separator 38, and most of the foreign matter is removed. The treatment liquid is discharged to the outside as a filtrate from the upper filtrate discharge port 23b, and the treatment liquid containing a large amount of foreign matter is deposited on the cylindrical precipitation portion 19 and then discharged to the outside from the precipitation solution discharge port 23c. Since the internal structure of the first cyclone device 18 is the same as that of the second cyclone device 23, the description thereof is omitted.

  As for the pair of first cyclone devices 18 shown in FIG. 1, one of the first cyclone devices 18 (the first cyclone device 18 on the left side in FIG. 1) with the open / close valves V2 and V4 open and the open / close valve V8 closed. When the filtrate is discharged from the filtrate outlet 18b, the other first cyclone device 18 becomes inoperable with the on-off valves V3 and V5 closed and the on-off valve V9 opened. The precipitation liquid flows down from the precipitation liquid outlet 18c. And it is comprised so that the relationship of this action | operation and a non-operation may switch alternately between a pair of 1st cyclone apparatuses 18 with a fixed period. Thereby, the process liquid in the electrodeposition tank 1 is always discharged | emitted as a filtrate and precipitation liquid from the filtrate discharge port 18b of one of the 1st cyclone apparatuses 18, and the precipitation liquid discharge port 18c.

  The same applies to the second cyclone device 23. That is, for the pair of second cyclone devices 23, the on-off valves V13 and V15 are in the open state and the on-off valve V21 is in the closed state, and one of the second cyclone devices 23 (the second cyclone device 23 on the left side in FIG. 1) operates. When the filtrate is discharged from the filtrate outlet 23b, the other second cyclone device 23 becomes inoperable because the on-off valves V14 and V16 are closed and the on-off valve V22 is opened. The precipitation liquid flows down from the liquid discharge port 23c. And it is comprised so that the relationship of this action | operation and a non-operation may be alternated between a pair of 2nd cyclone apparatuses 23 with a fixed period. Thereby, the process liquid in the electrodeposition tank 1 is always discharged | emitted as a filtrate and a precipitation liquid from the filtrate discharge port 23b of one of the 2nd cyclone apparatuses 23, and the precipitation liquid discharge port 23c.

“Separation tank 33, third cyclone apparatus 35 (cyclonic apparatus for separation tank)”
As described above, the foreign matter discharge pipe 31 whose one end communicates with the precipitation liquid discharge port 18c of the first cyclone device 18 and the precipitation liquid discharge port 23c of the second cyclone device 23 through the bifurcated pipe 31a has the other end of the screw conveyor. It faces the separation tank 33 containing 32. The screw conveyor 32 is installed vertically. The foreign matter discharge pipe 31 is provided with an on-off valve V23. One end of a waste liquid supply pipe 34 is connected to the side wall of the separation tank 33 above the central portion in the height direction, and the other end of the waste liquid supply pipe 34 is a waste liquid supply port 35a of a third cyclone device 35 (a cyclone device for a separation tank). Is connected through a pump 36. The filtrate outlet 35 b of the third cyclone device 35 communicates with the second treatment liquid supply pipe 10 via the filtrate outlet pipe 37, and the precipitate outlet 35 c is arranged toward the separation tank 33. The internal structure of the third cyclone device 35 is the same as that of the first cyclone device 18 and the second cyclone device 23.

"Processing liquid filtration device 50"
A processing liquid filtration device 50 is attached to the filtrate discharge port 23b of each second cyclone device 23 via a supply pipe 54 formed of a straight tube. As shown in FIG. 6, the supply pipe 54 is fitted into the filtrate outlet 23 b and the lower end thereof faces the centrifugal separator 38 of the second cyclone device 23. The supply pipe 54 is arranged coaxially with the centrifugal separator 38 and is fixed to the upper part of the second cyclone device 23 by a retaining nut 60.

  The treatment liquid filtration device 50 has a cylindrical housing 52. A filtrate supply hole 53 is formed in the lower surface of the housing 52, and the upper end of the supply pipe 54 is connected to the supply hole 53. A filtrate outlet 55 (see also FIG. 8) is formed on the upper side surface of the housing 52, and the filtrate discharge pipe 24 is connected to the outlet 55.

  An opening 57 for replacing the filter medium is formed on the upper surface of the housing 52. An opening 65 is formed in the lid member 64 detachably attached to the opening 57 so as to be coaxial with the supply pipe 54. A support portion 67 of the brush 66 is inserted into the opening 65 from below, and is screwed and fixed to the upper portion of the lid member 64 by a nut 68. For example, as shown in FIG. 7A, the brush 66 is formed by bending one metal wire to form parallel metal wires 69 and 69, and between the metal wires 69 and 69, a resin perpendicular to the metal wire 69 is formed. A large number of fine wires 72 made of metal or metal are sandwiched between the metal wires 69 and 69, and the wires are twisted in a straight line. Thus, as shown in FIG. 7B, a linear twisting rod 70 is formed as a core rod of the brush 66, and a cylindrical brush group consisting of a large number of thin wires 72 extending radially on the peripheral surface of the twisting rod 70. 71 is formed. The brush group 71 is formed on the circumferential surface of the lower half of the twist bar 70. As shown in FIG. 6, the upper end of the twisting rod 70 is detachably fitted and fixed inside the support portion 67. The twisting rod 70 is positioned coaxially with the supply pipe 54. The lower end of the brush group 71 and the bottom surface of the housing 52 are separated from each other with an appropriate distance. The lid member 64 is fastened and fixed to the housing 52 by screwing a bolt into a nut 73 welded to the housing 52. In addition, the structure of the brush 66 is not limited to the above aspect, and can be manufactured by various methods and materials.

"Action"
In FIG. 1, when the vehicle body W is immersed in the treatment liquid (electrodeposition liquid) in the electrodeposition tank 1 in a state where the vehicle body W is placed on the hanger 101 of the transfer conveyor 100, the height approximately equal to the immersion height position of the vehicle body W is obtained. The foreign matter adhering to the inner and outer surfaces of the vehicle body W is removed by the jet of the processing liquid from the second processing liquid discharge nozzle 13 located at the same position. The removed foreign matter flows to the downstream side in the transport direction of the vehicle body W of the electrodeposition tank 1 by the jet of the processing liquid from the second processing liquid discharge nozzle 13, a part flowing through the upper layer flows into the preliminary tank 2, and the rest is the electric Following the inclined surface 4 of the landing tank 1 and the partition wall 2d of the preliminary tank 2, the surface is inverted downward. Then, the foreign matter removed by the treatment liquid jet from the first treatment liquid discharge nozzle 9 disposed on the inclined surface 4 and the bottom surface 1 a flows upstream in the conveyance direction of the vehicle body W in the bottom layer of the electrodeposition tank 1. Due to the rectification function of the upright plate 6 extending in the longitudinal direction of the electrodeposition tank 1, the treatment liquid smoothly flows upstream in the transport direction of the vehicle body W in the bottom layer of the electrodeposition tank 1.

  When the processing liquid containing foreign matter flowing on the upstream side in the conveyance direction of the vehicle body W in the bottom layer of the electrodeposition tank 1 collides with the lower wall surface 1c of the electrodeposition tank 1, very fine foreign matters such as foreign matter having a small specific gravity are applied to the inclined plate 3c. It flows along and moves over the inclined plate 3c, but a foreign matter having a relatively large specific gravity is blocked by the inclined plate 3c and settles down. That is, the inclined plate 3c has a filter function to separate the foreign matter into light and heavy, so that the foreign matter having a small specific gravity gets over the inclined plate 3c and is accumulated in the second hopper 27. It is accumulated in the first hopper 3 located below the inclined plate 3c.

  The processing liquid containing foreign matter having a small specific gravity accumulated in the second hopper 27 is supplied to the second cyclone device 23 from the discharge port 27 a through the second suction pipe 21 by driving the pump 22. In the second cyclone device 23, the foreign matter is centrifuged by the swirling flow, the filtrate flows from the filtrate discharge port 23b to the treatment solution filtration device 50, and the precipitation solution is discharged from the precipitation solution discharge port 23c.

  In FIG. 6, the filtrate flows from the second cyclone device 23 to the treatment liquid filtration device 50 through the supply pipe 54. At this time, since the supply pipe 54 is a straight pipe arranged coaxially with the centrifugal separator 38 of the second cyclone device 23, the swirling flow generated in the centrifugal separator 38 passes through the supply pipe 54 and the housing of the processing liquid filtration device 50. 52 is efficiently transmitted to the inside of 52. Since the brush 66 is positioned at the center of the swirling flow generated in the housing 52 in this manner, very fine foreign matters such as light cotton dust contained in the filtrate gather at the center of the swirling flow, and the brush 66 Are efficiently collected by the brush group 71.

  In FIG. 1, the filtrate from which fine foreign matters have been removed by the brush 66 is discharged from the delivery port 55 to the filtrate discharge pipe 24, and a part of each of the treatment liquid discharge nozzles 30 via the branch pipe 28 and the branch pipe 29. Is injected toward the vehicle body W immediately after leaving the tank. As a result, the foreign matter that floats on the surface of the processing liquid and reattaches to the vehicle body W when it is lifted from the processing liquid is reliably removed. The remainder of the filtrate discharged from the outlet 55 to the filtrate discharge pipe 24 is jetted from the first process liquid discharge nozzle 9 via the first process liquid supply pipe 7 and the first branch pipe 8.

  On the other hand, the processing liquid containing the foreign material having a large specific gravity accumulated in the first hopper 3 is supplied to the first cyclone device 18 from the discharge port 3 a through the first suction pipe 20 by driving the pump 17. In the first cyclone device 18, the foreign matter is centrifuged by the swirling flow, and the filtrate is injected from the second treatment liquid discharge nozzle 13 via the second treatment liquid supply pipe 10 from the filtrate discharge port 18b. As described above, the jet of the processing liquid from the second processing liquid discharge nozzle 13 forms a jet flow toward the downstream side in the vehicle body conveyance direction in the upper and middle layers of the electrodeposition tank 1, and a part of the foreign matter having a relatively small specific gravity. Can be efficiently poured into the preliminary tank 2. The processing liquid in the preliminary tank 2 is processed by the first cyclone device 18 by flowing into the first suction pipe 20 through the third suction pipe 80 by driving the pump 81.

  The precipitation liquid containing a large amount of foreign matter after being separated in the first cyclone device 18 and the second cyclone device 23 is supplied to the separation tank 33 through the bifurcated pipe 31a and the foreign substance discharge pipe 31 from the precipitation liquid discharge ports 18c and 23c. . The precipitation liquid having a high foreign substance concentration supplied to the separation tank 33 is supplied to the third cyclone device 35 through the filtrate supply port 35a from the waste liquid supply pipe 34 by driving the pump 36, and the filtered treatment liquid and foreign substances are converted into the filtered treatment liquid and foreign substances. To be separated. The filtered treatment liquid is returned to the electrodeposition tank 1 through the second treatment liquid supply pipe 10 from the filtrate discharge pipe 37 connected to the filtrate discharge port 35b, and the foreign matter is returned to the separation tank 33 from the precipitation liquid discharge port 35c. Returned.

  The foreign matter settled on the bottom of the separation tank 33 is scooped up by the screw conveyor 32 and rises. The foreign matter is squeezed during the conveyance process by the screw conveyor 32, the processing liquid falls again to the bottom of the separation tank 33, and only the foreign matter is discharged from the top of the screw conveyor 32 to be processed separately. Thereby, only the foreign material in a process liquid can be efficiently removed with respect to the process liquid in the electrodeposition tank 1. FIG.

  As described above, the second hopper 27 (upper middle layer) is formed at one end side of the electrodeposition tank 1 (treatment tank) near the vehicle body entry tank and in the middle of the tank height, and collects the treatment liquid containing foreign matter having a small specific gravity. The second recovery unit) and the processing liquid from the second hopper 27 are separated into filtrate and foreign matter, and the filtrate is discharged from the upper filtrate outlet 23b formed on the axis of the centrifugal separator 38. A cyclone device 23 (upper middle cyclone device) and a treatment liquid filtration device 50 for further filtering the filtrate from the second cyclone device 23 and refluxing it to the electrodeposition tank 1, A supply pipe 54 comprising a straight pipe communicating with the filtrate outlet 23b of the second cyclone device 23 is connected to the lower supply hole 53, and a housing 52 to which the filtrate outlet pipe 24 is connected to the upper outlet 55. And detachable on the upper surface of the housing 52 A lid member 64 to be attached; and a brush 66 detachably attached to the lid member 64 coaxially with the supply pipe 54. The swirl flow generated in the centrifugal separator 38 of the second cyclone device 23 is processed through the supply pipe 54. If the foreign matter is collected by the brush 66 positioned at the center of the swirl flow after being transmitted to the inside of the housing 52 of the liquid filtration device 50, the following effects are exhibited.

  In the electrodeposition tank 1, foreign matter having a relatively small specific gravity tends to float on the upper middle layer of the tank. Therefore, by providing the second hopper 27 at one end side of the electrodeposition tank 1 and in the middle of the tank height, fine foreign matters can be efficiently collected. And since the collect | recovered fine foreign material is centrifuged with the 2nd cyclone apparatus 23, the filtrate is further filtered with the process liquid filtration apparatus 50, and it recirculate | refluxs to the electrodeposition tank 1, Therefore It is excellent in the filtration efficiency of a process liquid. In collecting the fine foreign matter in the processing liquid filtering device 50, since the swirl flow generated in the centrifugal separator 38 of the second cyclone device 23 is used, a complicated mechanism and a special filtering material that are likely to be expensive are used. The foreign matter can be efficiently removed at low cost without any need. Since the brush 66 is detachably attached to the lid member 64, maintenance work of the brush 66 is easy.

  Further, a first hopper 3 (bottom layer collecting section) that is formed on one end side of the electrodeposition tank 1 near the vehicle body tank and on the tank bottom and collects a processing liquid containing foreign matter having a large specific gravity, and a first hopper 3 A first cyclone device 18 (bottom layer cyclone device) that separates the treatment liquid into a filtrate and a foreign substance, and the filtrate discharged from the first cyclone device 18 is placed at a position in the middle of the tank height. The filtrate discharged from the second cyclone device 23 and directed to the vehicle body entry tank side at the tank bottom portion is sprayed by a plurality of second processing liquid discharge nozzles 13 provided so as to face the vehicle body exit side and toward the vehicle body. And if it is set as the structure sprayed by the some 1st process liquid discharge nozzle 9 provided so that it may face in the bottom face of a tank, the flow of the process liquid in the electrodeposition tank 1 will be the 2nd process liquid discharge nozzle in an upper middle layer part. 13 from the bottom of the car In this section, the discharge from the first treatment liquid discharge nozzle 9 can create a circulating flow in the direction opposite to the vehicle body conveyance direction, and foreign matter is removed by the first hopper 3 and the second hopper 27 located at the tank bottom and in the middle of the tank height, respectively. It can be efficiently integrated according to specific gravity.

  Further, the wall surface at one end of the electrodeposition tank 1 near the vehicle body tank is formed such that the upper wall surface 1b is deeper than the lower wall surface 1c, the second hopper 27 is a region in front of the upper wall surface 1b, and the first hopper 3 A flat inclined plate 3c, which is formed in a region in front of the lower wall surface 1c and extends around the upper end of the lower wall surface 1c and extends upward from the vehicle body, and collides with the lower wall surface 1c to disperse upward. Among the foreign matters in the liquid, a foreign matter having a small specific gravity is collected by the second hopper 27 along the inclined plate 3c, and a foreign matter having a high specific gravity is blocked by the inclined plate 3c and collected by the first hopper 3. The inclined plate 3c serves as a filter function that separates foreign matters into light and heavy ones, and foreign matters can be divided and accumulated by specific gravity with a simple structure.

  In addition, at least one of the second cyclone device 23 and the first cyclone device 18 is provided in parallel with two or more, and the discharge timing of the filtrate and the discharge timing of the precipitation liquid between the plurality of cyclone devices provided in parallel. By alternately switching between and the processing solution in the electrodeposition tank 1 is always taken out as a filtrate and a precipitation solution by any one of the cyclone devices, a system with excellent operation efficiency for removing foreign substances from the treatment solution is obtained. .

  Furthermore, a separation tank 33 in which the precipitation liquid discharged from the second cyclone apparatus 23 and the first cyclone apparatus 18 is input as a processing liquid, and the foreign matter in the processing liquid is squeezed out by the built-in screw conveyor 32 and discharged to the outside. A third cyclone device 35 (a cyclone device for a separation tank) that separates the treatment liquid from the separation tank 33 into a filtrate and a precipitation liquid, and the filtrate and the precipitation liquid separated by the third cyclone apparatus 35 are respectively provided. If it returns to the electrodeposition tank 1 and the separation tank 33, the filtrate discharged from the second cyclone device 23 and the first cyclone device 18 is further removed from the filtrate and foreign matter using the separation tank 33 and the third cyclone device 35. And the filtrate is refluxed to the electrodeposition tank 1, so that a foreign matter removing system with almost no loss of the processing solution is obtained.

  The preferred embodiment of the present invention has been described above. In the described embodiment, both the second cyclone device 23 and the first cyclone device 18 are provided in parallel, and the filtrate discharge timing and the precipitate solution discharge timing are alternately switched between the second cyclone devices 23. As a result, the treatment liquid in the electrodeposition tank 1 is always taken out as a filtrate and a precipitation liquid by any one of the second cyclone devices 23, and the discharge timing of the filtrate and the discharge timing of the precipitation liquid between the first cyclone devices 18 Are alternately taken out as a filtrate and a precipitation liquid by any one of the first cyclone devices 18, but the second cyclone device 23 and the first cyclone device 18. Provided in parallel for at least one of the above, and the discharge timing of the filtrate between the cyclone devices By switching between the discharge timing of the lees liquid alternately, by always either cyclone device processing liquid electrodeposition tank 1 may be taken out as filtrate and precipitation liquor.

  Moreover, it is also possible to attach the thing of the structure equivalent to the process liquid filtration apparatus 50 to the filtrate discharge port 18b of the 1st cyclone apparatus 18, and, thereby, the system excellent in the removal efficiency of a further fine foreign material is constructed | assembled. it can.

  Furthermore, the present invention is not limited to an electrodeposition tank, but can be applied to a degreasing tank, a washing tank, and the like. Moreover, a workpiece | work is applicable without being limited to the vehicle body of a motor vehicle.

1 Electrodeposition tank (treatment tank)
1b Upper wall surface 1c Lower wall surface 3 First hopper (recovery part for bottom layer)
9 First treatment liquid discharge nozzle 13 Second treatment liquid discharge nozzle 18 First cyclone device (bottom layer cyclone device)
18b Filtrate outlet 18c Precipitated liquid outlet 23 Second cyclone device (upper and middle layer cyclone device)
23b Filtrate outlet 23c Precipitate outlet 27 Second hopper (upper / middle layer recovery section)
32 Screw conveyor 33 Separation tank 35 Third cyclone device (cyclonic device for separation tank)
38 Centrifugal Separator 50 Treatment Liquid Filter 52 Housing 53 Supply Hole 54 Supply Pipe 55 Outlet 64 Cover Member 66 Brush 70 Twist Rod 71 Brush Group 100 Conveyor 101 Hanger W Car Body (Work)

Claims (5)

Regarding a processing tank transported in a state in which a workpiece is immersed in a processing liquid, a system for removing foreign matter in the processing liquid of the processing tank,
An upper middle layer recovery unit that is formed at one end side of the processing tank near the work tank and in the middle of the tank height, and that collects a processing liquid containing a foreign substance having a small specific gravity,
The upper middle layer cyclone device that separates the processing liquid from the upper middle layer recovery unit into filtrate and foreign matter, and discharges the filtrate from the upper filtrate outlet formed on the axis of the centrifuge unit;
A treatment liquid filtration device for further filtering the filtrate from the upper and middle layer cyclone device and refluxing it to the treatment tank,
The treatment liquid filtration device is
A supply pipe comprising a straight pipe communicating with the filtrate outlet of the upper and middle-layer cyclone device is connected to the lower supply hole, and a housing to which the filtrate outlet pipe is connected to the upper outlet,
A lid member detachably attached to the upper surface of the housing;
A brush that is detachably attached to the lid member coaxially with the supply pipe;
A swirling flow generated in the centrifugal separation unit of the upper-middle cyclone device is transmitted to the inside of the housing through the supply pipe, and foreign matter is collected by the brush located at the center of the swirling flow. The foreign substance removal system in the processing tank. A bottom layer recovery unit that is formed at one end side of the processing tank near the work tank and at the bottom of the tank, and collects a processing liquid containing foreign matter having a large specific gravity,
A bottom cyclone device that separates the processing liquid from the bottom layer recovery section into filtrate and foreign matter;
Further comprising
The filtrate discharged from the bottom layer cyclone device is sprayed by a plurality of second treatment liquid discharge nozzles provided so as to face the workpiece discharge tank side and to the workpiece at a position in the middle of the tank height,
The filtrate discharged from the upper / middle cyclone device is sprayed by a plurality of first treatment liquid discharge nozzles provided at the bottom of the tank so as to face the work tank and toward the bottom of the tank. The foreign substance removal system in the processing tank of Claim 1. The wall of one end of the treatment tank near the work tank is formed with the upper wall surface deeper than the lower wall surface, and the upper middle layer recovery part and the bottom layer recovery part are respectively composed of front areas of the upper wall surface and the lower wall surface, respectively. ,
Around the upper end of the lower wall surface, a flat inclined plate extending toward the workpiece discharge tank side and upward is provided,
Of the foreign matter in the processing liquid that collides with the lower wall surface and disperses upward, a foreign matter having a low specific gravity is collected along the inclined plate by the collecting unit for the upper middle layer, and a foreign matter having a high specific gravity is collected by the inclined plate. The foreign matter removal system in the processing tank according to claim 2, wherein the bottom layer collecting unit is shielded and collected. Providing at least one of the upper and lower layer cyclone devices and the bottom layer cyclone device in parallel in two or more units;
By alternately switching the discharge timing of the filtrate and the discharge timing of the precipitation liquid between the plurality of cyclone apparatuses provided in parallel, the treatment liquid in the treatment tank is always filtered by any one of the cyclone apparatuses. The foreign matter removal system in the treatment tank according to claim 2 or 3, wherein the foreign matter removal system is taken out as The separation liquid discharged from the upper and middle layer cyclone apparatus and the bottom layer cyclone apparatus as a processing liquid, a separation tank that squeezes foreign matter in the processing liquid by a built-in screw conveyor and discharges it to the outside,
A separation tank cyclone device for separating the treatment liquid from the separation tank into a filtrate and a precipitation liquid;
Further comprising
The system for removing foreign matter in a treatment tank according to any one of claims 2 to 4, wherein the filtrate and the precipitate separated by the cyclone apparatus for separation tank are returned to the treatment tank and the separation tank, respectively. .

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