JP6849465B2 - Liquid tank processing equipment - Google Patents

Description

The present invention relates to a liquid tank processing apparatus.

Patent Document 1 below discloses an electrodeposition coating device used in a coating process for an automobile body. The electrodeposition coating apparatus is provided with an electrodeposition coating tank containing an electrodeposition liquid, and a bag-shaped cloth filter is provided in a tank portion of an object to be coated in the electrodeposition coating tank. With this cloth filter, it is possible to capture suspended matter such as dust floating in the electrodeposition liquid.

Japanese Unexamined Patent Publication No. 6-28905

By the way, in the electrodeposition coating apparatus, electrodeposition coating is continuously performed on a plurality of vehicle bodies, and iron powder is discharged from the vehicle body into the electrodeposition liquid each time the vehicle body is carried into the electrodeposition liquid or immersed in the electrodeposition liquid. It is mixed. When the floating amount of iron powder mixed in the electrodeposition liquid increases, the electrodeposition coating efficiency decreases and the coating quality deteriorates, so that it is necessary to efficiently remove the iron powder.

In consideration of the above facts, an object of the present invention is to obtain a liquid tank treatment apparatus capable of efficiently removing iron powder mixed in the treatment liquid.

The liquid tank treatment apparatus according to the invention according to claim 1 has a treatment liquid tank in which the treatment liquid is stored and the treatment liquid is circulated in the tank, and a state in which the treatment liquid is immersed in the treatment liquid. A frame having an opening through which the processed liquid to be disposed and circulated passes, a magnet provided in the frame, and a magnet in the opening are stretched in a direction intersecting the circulation direction of the treatment liquid and magnetized by the magnet. The metal wire includes a plurality of metal wires and a filter having the metal wire, and the metal wire is stretched by fixing the metal wire to the frame body .

The liquid tank treatment apparatus includes a treatment liquid tank and a filter. In the treatment liquid tank, the treatment liquid is stored and the treatment liquid is circulated in the tank.
Here, the filter is arranged in a treatment liquid tank in a state of being immersed in the treatment liquid, and has a frame body, a magnet, and a plurality of metal wires. The frame has an opening through which the circulating treatment liquid passes. The magnet is provided on the frame. Then, the metal wire is stretched in the opening of the frame in a direction intersecting the circulation direction of the treatment liquid, and is magnetized by the magnet.
Therefore, the filter can attract the iron powder mixed in the treatment liquid that circulates in a wide range including the circumference of the magnet and the circumference of the magnetized metal wire, and attach it to the magnet and the metal wire.
Further, the metal wire is stretched by fixing the metal wire to the frame body. As a result, the manufacturing cost of the filter can be suppressed as compared with the case where the wire mesh or the like is manufactured in advance and the manufactured wire mesh or the like is combined with the frame to manufacture the filter.

In the invention according to claim 2, the frame body is made of the same metal material as the metal wire. As a result, iron powder can be attached to the frame in addition to the magnet and the metal wire, and the iron powder can be removed more effectively.
In the invention described in claim 3, the distance between adjacent metal wires is set in the range of 1 mm to 5 mm. By setting the distance between the adjacent metal wires to 1 mm or more, the treatment liquid can pass between the adjacent metal wires. Further, by setting the distance between the adjacent metal wires to 5 mm or less, the metal wires can be magnetized appropriately by the magnet.
In the invention according to claim 4, the filter is arranged at a place where the amount of iron powder suspended is large, based on the result of measuring the amount of iron powder suspended in the treatment liquid tank. As a result, the iron powder can be effectively removed by the filter arranged in the place where the amount of floating iron powder is large.

The liquid tank treatment apparatus has an excellent effect that iron powder mixed in the treatment liquid can be efficiently removed.

It is sectional drawing which saw from the side direction the whole schematic structure of the electrodeposition coating apparatus as the liquid tank processing apparatus which concerns on one Embodiment. It is an enlarged cross-sectional view which shows the entrance part of the electrodeposition coating tank as a processing liquid tank provided in the electrodeposition coating apparatus shown in FIG. 1 in an enlarged manner. It is a front view which looked at the filter arranged in the electrodeposition coating tank shown in FIGS. 1 and 2 from the circulation direction of the electrodeposition liquid as a treatment liquid. It is a flowchart explaining the iron powder removal method in the electrodeposition coating apparatus shown in FIG. 1 and FIG. It is a schematic block diagram of an inductively coupled plasma mass spectrometer for measuring the amount of iron powder floating mixed in the electrodeposition liquid stored in the electrical coating tank shown in FIGS. 1 and 2. It is a graph which shows the result of having measured the iron powder floating amount using the mass spectrometer shown in FIG.

Hereinafter, an electrodeposition coating apparatus according to an embodiment to which the liquid tank treatment apparatus according to the present invention is applied will be described with reference to FIGS. 1 to 6. Further, in the present embodiment, in addition to the description of the electrodeposition coating apparatus, the structure of the filter mounted on the electrodeposition coating apparatus and the iron powder removing method using this filter will also be described.

(Overall configuration of electrodeposition coating equipment)
As shown in FIG. 1, the electrodeposition coating apparatus 10 as the liquid tank treatment apparatus according to the present embodiment includes an electrodeposition coating tank 12 as a treatment liquid tank. In the electrodeposition coating apparatus 10, the iron body of the automobile shown in FIG. 2 is designated as an object to be coated 50, and the object to be coated 50 is electrodeposited and coated.
The object to be coated 50 is not limited to the vehicle body, and may be, for example, an iron part such as a radiator that requires rust prevention.

Returning to FIG. 1, the electrodeposition coating tank 12 of the electrodeposition coating apparatus 10 is formed in an inverted trapezoidal cross-sectional shape with the transport direction CD of the object to be coated 50 from the right side to the left side in the longitudinal direction. In the tank 12D of the electrodeposition coating tank 12, an electrodeposition liquid 24 as a treatment liquid for applying cationic electrodeposition coating is stored.
Here, in the cationic electrodeposition coating method, the object to be coated 50 is immersed in the electrodeposition liquid 24, a negative potential is applied to the object to be coated 50, and a positive potential is applied to an electrode (not shown) arranged in the tank 12D. Then, it is a method of depositing and painting a paint on an object to be painted 50 by utilizing an electrochemical phenomenon. The electrodeposition liquid 24 contains, for example, a paint that uses a cationic electrolytic resin as the main body of the vehicle.

The right end portion (first stage of the transport direction CD) of the electrodeposition coating tank 12 shown in FIG. 1 is an inlet portion 12A. In the tank portion 12A, the object to be coated 50 is carried into the tank 12D, and the object to be coated 50 is immersed in the electrodeposition liquid 24. That is, electrodeposition coating is started in the tank portion 12A.
The left and right intermediate portions (middle stage of the transport direction CD) of the electrodeposition coating tank 12 are intermediate tank portions 12B. In the intermediate tank portion 12B, the object to be coated 50 is conveyed in the electrodeposition liquid 24 in a state of being immersed, and the surface of the object to be coated 50 is electrodeposited.
The left end portion (the final stage of the transport direction CD) of the electrodeposition coating tank 12 is the exit tank portion 12C. At the discharge tank portion 12C, the object to be coated 50 that has been electrodeposited is pulled up from the electrodeposition liquid 24 and carried out from the inside of the tank 12D to the outside of the inside of the tank 12D.

A sub tank 14 connected to the electrodeposition coating tank 12 is arranged on the downstream side of the transport direction CD of the discharge tank portion 12C. The electrodeposition liquid 24 overflowing in the electrodeposition coating tank 12 is stored in the sub tank 14, and the electrodeposition liquid 24 is returned to the electrodeposition coating tank 12.

The electrodeposition coating tank 12 includes a circulation system 16 for the electrodeposition liquid 24. The circulation system 16 includes a circulation pipe 16A having one end connected to the vicinity of the bottom portion 12E of the electrodeposition coating tank 12 in the entry tank portion 12A, a pump 16B connected to the other end of the circulation pipe 16A, and one end to the pump 16B. It is configured to include a connected circulation pipe 16C. The electrodeposition liquid 24 of the electrodeposition coating tank 12 is sucked into the pump 16B through the circulation pipe 16A, and the pump 16B discharges the electrodeposition liquid 24 to the circulation pipe 16C. The other end of the circulation pipe 16C is connected to each of the pipes 20A to 20M and the pipes 22A to 22I appropriately arranged in the tank 12D of the electrodeposition coating tank 12, and the pipes 20A to 20M and the pipes 22A to 22I are connected from the circulation pipe 16C. The electrodeposition liquid 24 is supplied to each of the above.

The pipes 20A to 20M are sequentially arranged at a predetermined interval from the entry tank portion 12A through the intermediate tank portion 12B to the exit tank portion 12C in the upper part of the tank 12D of the electrodeposition coating tank 12. The electrodeposition liquid 24 is ejected from each of the pipes 20A to 20M toward the CD in the transport direction. As a result, in the upper part of the 12D in the tank, the electrodeposition liquid 24 flows in the arrow Q1 direction in the same direction as the transport direction CD.
On the other hand, the pipes 22A to 22I are sequentially arranged at a predetermined interval from the exit tank portion 12C through the intermediate tank portion 12B to the entry tank portion 12A at the lower portion of the tank 12D along the tank bottom portion 12E. The electrodeposition liquid 24 is ejected from each of the pipes 22A to 22I in the direction opposite to the transport direction CD. As a result, in the lower part of the tank 12D, the electrodeposition liquid 24 flows in the direction of arrow Q2 in the direction opposite to the transport direction CD.
That is, the electrodeposition coating tank 12 is configured such that the electrodeposition liquid 24 is circulated in the direction of arrow Q1 and the direction of arrow Q2 in the tank 12D.

The sub tank 14 is also provided with a circulation system 18. The circulation system 18 includes a circulation pipe 18A having one end connected to the sub tank 14, a pump 18B connected to the other end of the circulation pipe 18A, and a circulation pipe 18C having one end connected to the pump 18B. There is. The other end of the circulation pipe 18C is connected to the pipe 20A or the like, although not shown.

(Filter configuration and placement position)
As shown in FIGS. 1 and 2, the electrodeposition coating apparatus 10 according to the present embodiment includes a filter 40 arranged in the electrodeposition liquid 24 in the electrodeposition coating tank 12. As shown in FIG. 2, in the present embodiment, the filter 40 is used in the tank portion 12A of the electrodeposition coating tank 12 before and after the transport direction CD in the region where the object to be coated 50 is carried into the electrodeposition liquid 24. It is arranged in two places. In other words, the filter 40 is arranged at a position closest to the object to be coated 50 of the tank portion 12A within a range that does not interfere (contact) with the object to be coated 50.

As shown in FIG. 3, the filter 40 includes a frame body 42, a magnet 46, and a metal wire 48. More specifically, the frame body 42 has a pair of upper and lower frames 42A and lower frames 42B, and a pair of left and right horizontal frames 42C and right horizontal frames 42D, and the vertical direction is defined as the longitudinal direction when viewed from the transport direction CD. It is formed in a rectangular shape. Both the upper frame 42A and the lower frame 42B are made of a plate material extending in the width direction of the electrodeposition coating tank 12 as the longitudinal direction and having the vertical direction as the plate thickness direction. Both the left horizontal frame 42C and the right horizontal frame 42D are made of a plate material extending in the vertical direction as the longitudinal direction and having the width direction of the electrodeposition coating tank 12 as the plate thickness direction. The central portion of the frame body 42 is an opening 44 through which the electrodeposition liquid 24 circulated in the direction of arrow Q1 passes.
The frame body 24 is formed by using a metal material, a resin material, or the like having excellent corrosion resistance. In the present embodiment, the frame body 24 is made of stainless steel, particularly, for example, SUS329J1 of Japanese Industrial Standards. Further, the frame body 24 has the width direction set to, for example, 500 mm to 520 mm and the vertical dimension set to, for example, 700 mm to 720 mm, and is relatively compact and easy to handle with respect to the size of the object to be coated 50. Has been done.

The magnets 46 are a first magnet 46A arranged parallel to the upper frame 42A on the upper part of the frame body 42 and a second magnet 46B arranged parallel to the lower frame 42B on the lower part of the frame body 42. It is composed of two of them. Both ends of the first magnet 46A and the second magnet 46B are attached to the left horizontal frame 42C and the right horizontal frame 42D. Here, permanent magnets are used for each of the first magnet 46A and the second magnet 46B. Further, the upper side of each of the first magnet 46A and the second magnet 46B is an N pole, and the lower side is an S pole.

A plurality of metal wires 48 are stretched between the left horizontal frame 42C and the right horizontal frame 42D of the frame body 24, and a plurality of metal wires 48 are arranged at regular intervals in the vertical direction. The metal wire 48 is stretched in a direction intersecting the circulation direction of the arrow Q1 of the electrodeposition liquid 24, in this case, in a direction orthogonal to each other. The metal wire 48 is configured to be magnetized by the first magnet 46A and the second magnet 46B. The metal wire 48 is formed of, for example, a wire rod made of the same metal material as the frame body 42.
The dimension between the vertically adjacent metal wires 48 is set in the range of 1 mm to 5 mm. By setting the distance between the metal wires 48 to 1 mm or more, the paint of the electrodeposition liquid 24 can pass between the metal wires 48, and the retention of the paint can be effectively suppressed. Further, by setting the distance between the metal wires 48 to 5 mm or less, the metal wires 48 are appropriately magnetized from the magnet 46, and the iron powder mixed in the electrodeposition liquid 24 circulated between the metal wires 48 is mixed. Can be properly attracted to ensure that the iron powder adheres to the metal wire 48.

As shown in FIG. 1, the filter 40 is suspended and supported by the electrodeposition coating device 10 or the ceiling 54 in the coating chamber in which the electrodeposition coating device 10 is installed via a support member 52. .. In the present embodiment, of the two arrangement positions shown in FIGS. 1 and 2, five filters 40 are arranged linearly in the width direction in the front stage of the transport direction CD and arranged in the tank 12D. There is. Further, three filters 40 are arranged linearly in the width direction in the 12D in the tank in the rear stage of the transport direction CD.
The size of the filter 40, the number of arrangement positions, the number of arrangements, and the like are not limited to this example.

(Iron powder removal method for electrodeposition coating tank)
The iron powder removing method in the electrodeposition coating apparatus 10 according to the present embodiment is as follows. First, in the electrodeposition coating tank 12 of the electrodeposition coating apparatus 10 shown in FIG. 1, iron mixed in each of the electrodeposition liquids 24 of the entry tank portion 12A, the intermediate tank portion 12B, and the exit tank portion 12C. The amount of powder suspended is measured (step S1 in FIG. 4).

The quadrupole inductively coupled plasma mass spectrometry (ICP-MS) apparatus 60 shown in FIG. 5 is used for measuring the amount of iron powder suspended. The ICP-MS apparatus 60 includes a sample introduction unit 62, an ionization unit 64, an interface unit 66, a lens unit 68, a mass separation unit 70, and a detection unit 72.

First, in the sample introduction unit 62, 24 L of the sample solution is collected from the electrodeposition solution 24 to be measured (step S2). The collected sample liquid 24L is supplied to the chamber 62B via the pump 62A. On the other hand, argon gas Ar is supplied to the chamber 62B as a carrier gas from the carrier gas supply source 62C.
In the ionization unit 64, 24 L of the sample liquid atomized together with the argon gas Ar is introduced from the chamber 62B into the quartz torch 64A. A high frequency coil 64B is arranged around the torch 64A, a high frequency is supplied to the high frequency coil 64B, and an electric field is generated in the torch 64A. Due to the generation of this electric field, the temperature rises from 6000K to 8000K, the argon gas Ar is turned into plasma, and the iron powder mixed in the atomized sample liquid 24L is iron-ionized (step S3).
Iron ions are sent to the mass separation unit 70 through the vacuum-exhausted interface unit 66 and the ion lens 68A of the lens unit 68. The mass separation unit 70 includes a quadrupole mass filter 70A, and iron ions are separated into mass / charge number (m / z) by the quadrupole mass filter 70A.
The detection unit 72 performs mass spectrometry, and the detector 72A is used to count iron ions by mass number as an electric signal (step S4).

FIG. 6 shows the measurement results of the amount of iron powder in each of the entry tank portion 12A, the intermediate tank portion 12B, and the exit tank portion 12C. Assuming that the amount of iron powder in the inlet portion 12A is 10, the amount of iron powder in the intermediate tank portion 12B is 8.90 to 8.95, and the amount of iron powder in the outlet portion 12C is 8.70 to 8.80. Got That is, in the tank portion 12A, the largest amount of iron powder floating is mixed in the electrodeposition coating tank 12.

Based on the measurement result of the iron powder floating amount in step S1, the arrangement position of the filter 40 in the tank 12D of the electrodeposition coating tank 12 is determined (step S5). In the present embodiment, as shown in FIGS. 1 and 2, the filters 40 are arranged at two locations in the tank portion 12A.

Then, as shown in FIG. 2, in the electrodeposition coating apparatus 10, the object to be coated 50 is carried into the electrodeposition liquid 24 from the tank portion 12A of the electrodeposition coating tank 12, and the object to be coated 50 is electrodeposited. Is applied (step S6). The object to be coated 50 is taken out from the electrodeposition liquid 24 via the intermediate tank portion 12B and carried out from the discharge tank portion 12C to complete the electrodeposition coating.

Here, in the inlet portion 12A of the electrodeposition coating tank 12, a filter 40 is arranged, and the electrodeposition liquid 24 is constantly circulated through the filter 40. Therefore, iron powder adheres to the filter 40 and is removed, and the amount of iron powder suspended in the electrodeposition liquid 24 is reduced.

Next, it is determined whether a certain period of time has passed or whether or not the electrodeposition coating of a certain number of objects to be coated 50 has been completed (step S7). The fixed period is, for example, a period of several months. A fixed number is a number of hundreds or thousands of units. If it is determined that the lapse has passed, it is determined again whether or not the iron powder floating amount needs to be measured (step S8). When it is necessary to measure the amount of iron powder suspended, the processes after step S1 are executed. If it is not necessary to measure the floating amount of iron powder, the flow of the iron powder removing method ends.

(Action and effect of this embodiment)
As shown in FIGS. 1 and 2, the electrodeposition coating apparatus 10 according to the present embodiment includes an electrodeposition coating tank 12 and a filter 40. The electrodeposition liquid 24 is stored in the electrodeposition coating tank 12, and the electrodeposition liquid 24 is circulated in the tank 12D.

Here, as shown in FIGS. 1 and 2, the filter 40 is arranged in the electrodeposition coating tank 12 in a state of being immersed in the electrodeposition liquid 24, and as shown in FIG. 3, the filter 40 and the frame body 42 , A magnet 46 and a plurality of metal wires 48. The frame body 42 has an opening 44 through which the electrodeposition liquid 24 circulated in the direction of arrow Q1 (see FIGS. 1 and 2) passes through. The magnet 46 is provided on the frame body 42. Then, the metal wire 48 is stretched in the opening 44 of the frame body 42 in a direction intersecting the circulation direction (arrow Q1 direction) of the electrodeposited liquid 24, and is magnetized by the magnet 46.
Therefore, the filter 40 attracts the iron powder mixed in the electrodeposition liquid 24 that circulates in a wide range including the periphery of the magnet 46 and the periphery of the magnetized metal wire 48, and adheres to the magnet 46 and the metal wire 48. Can be made to.
Therefore, the electrodeposition coating apparatus 10 can efficiently remove the iron powder mixed in the electrodeposition liquid 24.

Further, as shown in FIG. 3, the filter 40 has a simple structure including a frame body 42, a magnet 46, and a metal wire 48.
Further, since the number of magnets 46 can be reduced by using the metal wire 48, the manufacturing cost of the filter 40 can be reduced.
Further, the iron powder adhering to the magnet 46 of the filter 40 and the metal wire 48 can be easily washed away with, for example, high-pressure washing water. Therefore, the maintenance of the electrodeposition coating apparatus 10 can be simplified.

Further, as shown in FIG. 3, in the filter 40, a plurality of metal wires 48 are stretched at regular intervals. In the present embodiment, the plurality of metal wires 48 are stretched at intervals of 1 mm to 5 mm. Therefore, in the filter 40, iron powder can be efficiently removed, and the electrodeposition liquid 24 including the paint can be smoothly circulated.

Further, in the iron powder removing method using the electrodeposition coating apparatus 10 according to the present embodiment, as shown in FIG. 4, the iron powder floating amount is measured (step S1), and the iron powder in the electrodeposition coating tank 12 is measured. The filter 40 is arranged at a place where the amount of floating is large (step S5). In the present embodiment, the filter 40 is centrally arranged in the inlet portion 12A of the electrodeposition coating tank 12. Therefore, in the iron powder removing method, the filter 40 is arranged at the position where the iron powder floating amount is the largest in the electrodeposition coating tank 12, so that the iron powder can be efficiently removed.

[Supplementary Description of the above Embodiment]
The present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist thereof.
For example, in the present invention, the shape of the frame or opening of the filter is not limited to a rectangular shape, but may be a triangular shape, a polygonal shape of a pentagon or more, an elliptical shape, or the like when viewed from the transport direction. Good.
Further, in the present invention, the number of magnets in the filter is not limited to two, and may be one or three or more.
Further, in the present invention, the filter may be configured by arranging a magnet, a plurality of metal wires, a magnet, a plurality of metal wires, and a magnet in this order. That is, a magnet may be arranged between the plurality of metal wires and the plurality of metal wires.
Further, in the present invention, the metal wire of the filter may be stretched in the vertical direction.
Further, in the present invention, an electromagnet may be used as the magnet of the filter.
Further, in the present invention, the flow direction of the electrodeposition liquid on the upper side in the tank, which is circulated in the electrodeposition coating tank, coincides with the transport direction of the object to be coated, but the flow direction of the electrodeposition liquid is to be coated. It may be in the direction opposite to or intersecting the transport direction of the object.

Further, in the above embodiment, an example in which the present invention is applied to the electrodeposition coating apparatus has been described, but the present invention can be applied to a cleaning treatment apparatus or a degreasing treatment apparatus as a liquid tank treatment apparatus. Both the cleaning treatment and the degreasing treatment are carried out as pretreatments for the electrodeposition coating treatment.
More specifically, first, in the cleaning treatment apparatus, the cleaning liquid as the treatment liquid is circulated in the cleaning treatment tank as the treatment liquid tank to clean the surface of the object to be coated (object to be cleaned). Then, the filter can efficiently remove the iron powder mixed in the cleaning liquid during the cleaning treatment.
On the other hand, in the degreasing treatment apparatus, the degreasing liquid as the treatment liquid is circulated in the degreasing treatment tank as the treatment liquid tank, and the surface of the object to be coated (the object to be degreased) is degreased. Then, the filter can efficiently remove the iron powder mixed in the degreasing liquid during the degreasing treatment.

10 Electrodeposition coating equipment (liquid tank treatment equipment)
12 Electroplated coating tank (treatment liquid tank)
12D tank 24 electrodeposition liquid (treatment liquid)
40 Filter 42 Frame 44 Opening 46 Magnet 48 Metal wire

Claims (4)

A liquid tank treatment device used in electrodeposition coating equipment.
A treatment liquid tank in which the treatment liquid is stored and the treatment liquid is circulated in the tank, and
A frame having an opening through which the circulating treatment liquid is arranged in the treatment liquid tank while being immersed in the treatment liquid, a magnet provided in the frame, and the treatment in the opening. A filter having a plurality of metal wires stretched in a direction intersecting the liquid circulation direction and magnetized by the magnet.
With
The metal wire is a liquid tank processing device stretched by fixing the metal wire to the frame body. The liquid tank processing apparatus according to claim 1, wherein the frame is made of the same metal material as the metal wire. The liquid tank processing apparatus according to claim 1 or 2, wherein the distance between adjacent metal wires is set in the range of 1 mm to 5 mm. The liquid tank treatment apparatus according to any one of claims 1 to 3, wherein the filter is arranged at a location where the amount of floating iron powder is large, based on the result of measuring the amount of floating iron powder in the treatment liquid tank. ..

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