JP6981328B2 - Electrodeposition coating hanger, electrodeposition coating equipment - Google Patents

Description

The present invention relates to a technique for applying electrodeposition coating to a work.

Conventionally, in the electrodeposition process of applying electrodeposition coating to an automobile body (hereinafter, simply referred to as "body"), the body is immersed in an electrolytic cell in which the electrodeposition coating is stored and a DC voltage is applied to the surface of the body. A treatment for precipitating an inert coating film is performed. Further, in the stage before the electrodeposition step, a pretreatment step of treating the surface of the body with a degreasing liquid is executed, and in the stage after the electrodeposition step, a baking and drying process of the body after painting is executed.

Here, while the body is transported by a hanger from the pretreatment step to the electrodeposition step, this hanger is returned from the electrodeposition step to the pretreatment step and used for transporting another body. Therefore, the hanger circulates in a wet state between the hanger and the pretreatment step after the coating film is formed on the outer surface in the electrodeposition step.

At this time, the alkaline degreasing liquid enters the plurality of burrow-shaped recesses of the coating film in the pretreatment step, and the acidic electrodeposition paint also enters in the electrodeposition step to generate gelled agglomerates. Then, when the aggregate is washed from the hanger, it peels off from the hanger and adheres to the body, or when it is suspended in the electrolytic cell, it adheres to the body. Therefore, the coating film formed on the outer surface of the hanger is formed. Cleaning work is required to remove it.

Therefore, when designing equipment for applying electrodeposition coating to various workpieces including the body, a technique for preventing the formation of a coating film on the surface of the hanger during electrodeposition coating of the workpiece is required. As one of the techniques, the following Patent Document 1 discloses that the outer surface of the hanger is coated with FRP. This technique uses an FRP coating, which is an insulator, to prevent the metal part of the hanger from coming into direct contact with the electrodeposition paint in the electrolytic cell.

Japanese Unexamined Patent Publication No. 10-18087

However, with the measure of providing an insulator such as an FRP coating on the outer surface of the hanger as disclosed in Patent Document 1, when the insulator is damaged or peeled off, the exposed portion of the outer surface of the hanger is exposed. A coating can be formed. Therefore, it is difficult to prevent the formation of a coating film on the outer surface of the hanger and reduce the cleaning work of the hanger.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an effective technique for preventing a coating film from being formed on the outer surface of a hanger that conveys the work during electrodeposition coating of the work. It is a thing.

One aspect of the present invention is
A hanger for electrodeposition coating that conveys a conductive workpiece during electrodeposition coating.
The hanger body that holds the above work and
The current collector attached to the hanger body in an electrically insulated state,
An energizing unit that electrically connects the current collector and the work held by the hanger body by bypassing the hanger body.
Equipped with
The hanger body has at least one support arm that supports the work.
The energizing portion is provided at the bottom of the support arm located below the work so as to be in contact with the work, and is electrically insulated from the support arm. It has a wiring cable in which a conducting wire electrically connected to the attachment is covered with an electrically insulating coating material.
The support arm is configured as a tubular tube having a hollow portion for wiring the wiring cable.
The bottom of the support arm is provided with a partition wall for partitioning the hollow portion and a drain stopper bolt used for draining the drain accumulated in the hollow portion partitioned by the partition wall. Hanger for electrodeposition coating,
It is in.

Further, another aspect of the present invention is
An electrolytic cell in which the electrodeposition paint is stored and an electrode that is the opposite electrode of the conductive work is immersed, a hanger for immersing the work in the electrolytic cell while transporting the work, and the work immersed in the electrolytic cell. A power supply that applies a DC voltage for electrolysis between the electrode and the above electrode is provided.
The hanger is an electrodeposition coating apparatus, which is composed of the electrodeposition coating hanger.
It is in.

The reference mode is
It is an electrodeposition coating method that applies electrodeposition coating to a conductive work.
The hanger body that holds the work, the current collector attached to the hanger body in an electrically insulated state, and the current collector and the work held by the hanger body are electrically connected by bypassing the hanger body. Prepare a hanger equipped with a current-carrying part and
While transporting the work by the hanger, the work is immersed in an electrolytic cell in which the electrodeposition paint is stored, and a DC voltage for electrodeposition is applied between the work and the electrode opposite to the work to energize the energized portion. How to apply electrodeposition
It is in.

In each of the above embodiments, when the work is conveyed by the hanger during electrodeposition coating, the work is not used for the current-carrying path of the hanger body, but is used for the current-carrying path of the current-carrying part that directly connects the current collector and the work. Energize. That is, the hanger does not have an energizing function for passing a current between the current collector and the work, but has only a function of transporting the work.

Therefore, when the hanger is immersed in the electrolytic cell in which the electrodeposition paint is stored together with the work and a DC voltage for electrodeposition is applied between the work and the electrodes, electricity is applied between the current collector and the work. Only, the hanger body is not energized. Therefore, when the work is electrodeposited, a coating film is formed on the work itself, but no coating film is formed on the outer surface of the hanger body due to the electrodeposition action.

As described above, according to each of the above aspects, it is possible to provide an effective technique for preventing the formation of a coating film on the outer surface of the hanger that conveys the work during electrodeposition coating of the work. ..

The perspective view of the clothes hanger for electrodeposition coating of the reference form 1. FIG. The side view of the part A in FIG. FIG. 3 is a cross-sectional view of a portion B in FIG. The figure which shows the outline of the process to paint a work. The figure which shows the state of applying electrodeposition coating to the work in the electrolytic cell in FIG. 4 in a schematic diagram. The perspective view of the hanger for electrodeposition coating of the reference form 2. The side view of the A1 part in FIG. FIG. 6 is a cross-sectional view of the B1 portion in FIG. The perspective view of the clothes hanger for electrodeposition coating of Embodiment 1. FIG. FIG. 9 is a cross-sectional view of the B2 portion in FIG. FIG. 10 is a cross-sectional view taken along the line XI-XI in FIG.

Preferred embodiments of each of the above embodiments will be described below.

In the electrodeposition coating hanger, the hanger body has at least one support arm that supports the work, and the energizing portion is located at the bottom of the support arm located below the work. A conductive attachment provided so as to be in contact with the work and electrically insulated from the support arm, and a conducting wire for electrically connecting the current collector and the attachment are covered with an electrically insulating coating material. It is preferable to have a wiring cable.

According to this electrodeposition coating hanger, it is possible to construct an energized portion that electrically connects the current collector and the work by bypassing the hanger body by using the existing elements of the attach and wiring cables. Therefore, the cost required for the hanger can be kept low.

In the electrodeposition coating hanger, the support arm has a tubular portion extending between the current collector and the attach, and the tubular portion is configured to accommodate the wiring cable. It is preferable to have it.

According to this electrodeposition coating hanger, it is effective to protect the wiring cable by accommodating the wiring cable in the tubular portion of the support arm.

In the clothes hanger for electrodeposition coating, the hanger body is attached to the first support arm and the second support arm as the support arm, and the bottoms of the first support arm and the second support arm, respectively. It is preferable to have a mounting stay provided integrally with the work, and a connecting arm for connecting the mounting stay on the first support arm side and the mounting stay on the second support arm side at a lower position than the work. ..

According to this electrodeposition coating hanger, the attachment on the first support arm side and the attachment on the second support arm side are indirectly connected via the mounting stay and the connecting arm. Therefore, it is possible to increase the supporting strength of the work at the time of attachment as compared with the case where the connecting arm is not provided.
Further, by providing the connecting arm on the hanger main body, it is possible to omit a connecting member that directly connects the first support arm and the second support arm at a higher place than the work. In this case, if the deposit attached to the connecting member is peeled off, the work located below it is easily affected. However, if a connecting arm located below the work is used instead of this connecting member, the work can be moved from the connecting arm. Not easily affected by peeled deposits.

In the electrodeposition coating hanger, the mounting stay has an upper plate joined to the attachment and a bracket for sandwiching the bottom of the arm with a sheet-shaped electrical insulating member interposed between the upper plate and the upper plate. However, it is preferable that the upper plate and the bracket are configured to be fastened and fixed with bolts having electrical insulation.

According to this electrodeposition coating hanger, the decrease in rigidity that occurs when a sheet-shaped electrically insulating member is used for a part of the mounting stay can be compensated for by the connecting arm.

In the electrodeposition coating hanger, the mounting stay includes an upper plate joined to the attachment and a bracket for sandwiching the bottom of the arm whose outer peripheral surface is covered with an electrically insulating member between the upper plate. It is preferable that the upper plate and the bracket are configured to be fastened and fixed with bolts.

According to this electrodeposition coating hanger, by covering the outer peripheral surface of the bottom of the arm with an electrically insulating member, a general-purpose inexpensive bolt can be used for fastening and fixing the upper plate and the bracket.

In the electrodeposition coating hanger, it is preferable that the weight portion is configured to be sandwiched between the upper plate of the mounting stay and the bracket.

According to this electrodeposition coating hanger, the mounting stay that sandwiches the heavy weight portion of the first support arm and the mounting stay that sandwiches the heavy weight portion of the second support arm are connected via the connecting arm. By connecting to each other, the strength of the entire hanger can be increased.

In the electrodeposition coating hanger, it is preferable that the current collector is configured to be attached to the hanger body with an electrical insulator interposed between the hanger body and the hanger body.

According to this electrodeposition coating hanger, by interposing an electrical insulator between the current collector and the hanger main body, it is possible to simplify the structure for attaching the current collector to the hanger main body in an electrically insulated state.

In the electrodeposition coating apparatus, the hanger is placed between a pretreatment tank that pretreats the work with a degreasing liquid before electrodeposition of the electrodeposition paint, and the electrolytic cell and the pretreatment tank. It is preferable to provide a drive unit that circulates together with the work.

In this electrodeposition coating device, the hanger circulates between the electrolytic cell and the pretreatment tank by the drive unit. Here, since the hanger body is not energized in the electrolytic cell, it is difficult for a coating film to be formed on the outer surface thereof. Therefore, the amount of agglomerates gelled by the alkaline degreasing liquid in the pretreatment tank and the acidic electrodeposition paint in the electrolytic cell on the outer surface of the hanger body can be suppressed to a small amount, and the agglomerates are removed from the work. The man-hours required for this can be reduced.

In the electrodeposition coating method, the electrolytic cell for electrodepositing the electrodeposition paint on the work, and a pretreatment tank for pretreating the work with a degreasing liquid before electrodeposition of the electrodeposition paint. It is preferable to circulate the hanger between them.

According to this electrodeposition coating method, even when the hanger is circulated between the electrolytic cell and the pretreatment tank, the alkaline degreasing liquid of the pretreatment tank and the acidic electrodeposition paint of the electrolytic cell are applied to the outer surface of the hanger body. However, the amount of gelled agglomerates can be suppressed to a small extent.

Hereinafter, embodiments of an electrodeposition coating apparatus and an electrodeposition coating method for electrodeposition coating of a work will be described with reference to the drawings.

In the drawings for explaining this embodiment, unless otherwise specified, the first direction along the transport direction of the work is indicated by an arrow X, and the second direction, which is a horizontal direction orthogonal to the first direction, is indicated by an arrow Y. It is assumed that the third direction, which is a vertical direction (height direction) orthogonal to the first direction, is indicated by an arrow Z.

( Reference form 1)
As shown in FIG. 1, the electrodeposition coating hanger (hereinafter, simply referred to as “hanger”) 1 of Reference Form 1 is for transporting a conductive work W at the time of electrodeposition coating. In this form state, the workpiece W is a car body, a tray (not shown) for placing the car body is constituted by.

The hanger 1 includes a hanger main body 10, a current collector 20, and an energizing unit 30.

The hanger body 10 holds the work W and has two support arms 11 and 12. Both of these two support arms 11 and 12 are formed of a cylindrical tube having a substantially C-shape (or a staple shape that is a rectangular shape with a part opened).

One first support arm 11 is arranged on the front side of the work W in the transport direction D, and the other second support arm 12 is arranged on the rear side of the work W in the transport direction D. The first support arm 11 may be referred to as a "front arm", and the second support arm 12 may be referred to as a "rear arm".

The two support arms 11 and 12 are connected to each other by the connecting arm 16 extending in the first direction X, and the bottom of the arm is connected by the two connecting arms 17 extending in parallel with the first direction X. 11b and 12b are connected to each other.

Each of the driven portions 13 of the arm upper portion 11a and the arm upper portion 12a is driven in the transport direction D by a driving portion described later (see the driving portion 50 in FIG. 4). A current collector 20 electrically connected to the conductive bar 2 is attached to the driven portion 13 of the arm upper portion 11a.

The energizing unit 30 is configured to electrically connect the current collector 20 and the work W held by the hanger body 10 by bypassing the hanger body 10. The energizing portion 30 includes a conductive attach 31 attached to each of the arm bottoms 11b and 12b of the two support arms 11 and 12, a wiring cable 32 that electrically connects the current collector 20 and the attach 31. Have.

The energization unit 30 on the first support arm 11 side has an energization path C in which the current collector 20 of the arm upper portion 11a is electrically connected to the two attaches 31 through the wiring cable 32 without passing through the first support arm 11. .. Similarly, in the energizing portion 30 on the second support arm 12 side, the current collector 20 of the arm upper portion 11a is electrically connected to the two attaches 31 through the wiring cable 32a branched from the wiring cable 32 without passing through the second support arm 12. Has an energization path C connected to.

In the holding state in which the work W is set on the hanger 1, the work W has two attaches 31 protruding upward from the arm bottom 11b of the first support arm 11 along the third direction Z, and a second support arm. It is configured to be supported from below by a total of four attaches 31 including two attaches 31 protruding upward along the third direction Z from the bottom of the arm 12b.

As shown in FIG. 2, in the arm upper portion 11a of the first support arm 11, the driven portion 13 is fastened and fixed to the metal bracket 14 (see the portion A in FIG. 1). Further, although not particularly shown, the driven portion 13 of the arm upper portion 12a of the second support arm 12 is also fastened and fixed to the metal bracket 14. Then, each bracket 14 is fastened and fixed to the corresponding current collector 20 by an electric insulating bolt (not shown) with the electric insulator 15 sandwiched therein.

Therefore, each current collector 20 is attached to the hanger main body 10 with an electrical insulator 15 interposed between the current collector 20 and the hanger main body 10. At this time, the current collector 20 is in an electrically insulated state that is electrically insulated from the hanger main body 10.

On the other hand, the current collector 20 is electrically connected to one end 33a of each of the conducting wires 33 of the wiring cables 32 and 32a. Here, the first support arm 11 is a tubular tube in which all the portions are hollow cylindrical portions, and the wiring cable 32 is housed in the tubular portion extending between the current collector 20 and the attach 31. It is configured as follows. Therefore, the wiring cable 32 extending from the current collector 20 is introduced into the pipe through a through hole (not shown) provided in the arm upper portion 11a of the first support arm 11, and the inside of the pipe is directed toward the arm bottom portion 11b side. It is wired.

Further, the wiring cable 32a branched from the wiring cable 32 passes through the pipe of the arm upper portion 11a of the first support arm 11, and after passing through the pipe of the connecting arm 16, into the pipe of the arm upper portion 12a of the second support arm 12. It has been introduced and is wired in this pipe toward the bottom of the arm 12b (see FIG. 1).

As shown in FIG. 3, the hanger main body 10 includes a mounting stay 40 provided integrally with the attach 31 on the arm bottom portion 11b of the first support arm 11 (see the portion B in FIG. 1). The mounting stays 40 are provided at two locations separated in the second direction Y at the arm bottom portion 11b of the first support arm 11.

Further, although not particularly shown, two mounting stays 40 having the same shape as the mounting stay 40 are also provided integrally with the attach 31 in the arm bottom portion 12b of the second support arm 12.

Therefore, in the following, only the attach 31 and the mounting stay 40 on the first support arm 11 side will be described, and the description of the attach 31 and the mounting stay 40 on the second support arm 12 side will be omitted. By referring to the following description, the specific structure of the attach 31 and the mounting stay 40 on the second support arm 12 side will be clarified. Further, although not particularly described, the structure of the wiring cable 32a on the second support arm 12 side is the same as the structure of the wiring cable 32 on the first support arm 11 side.

The attach 31 is provided on the bottom portion 11b of the first support arm 11 located below the work W so as to be in contact with the work W. The attach 31 is configured as a plate-shaped metal plate whose plate thickness is substantially constant when the plate width is defined as the first direction X and the plate thickness is defined as the second direction Y. The attach 31 has a shape in which the plate width gradually decreases from the base end portion 31a on the mounting stay 40 side toward the tip end portion 31b on the work W side when viewed from the side in the second direction Y. The attach 31 contacts the work W at the tip portion 31b and supports the work W from below.

The shape of the attach 31 is not limited to such a shape, and can be appropriately changed as needed. For example, when the automobile body itself becomes a work W without using a tray, the automobile body is directly mounted on the attach 31, so that the shape of the attach 31 is determined according to the shape of the automobile body side. ..

The mounting stay 40 is a bracket that sandwiches the arm bottom portion 11b between the metal upper plate 41 joined by welding to the base end portion 31a of the attach 31 and the sheet-shaped electrical insulating member 43. 42 and. The upper plate 41 and the bracket 42 are fastened and fixed with bolts (electrically insulating bolts) 44 having electrical insulation performance.

Therefore, the attach 31 on the first support arm 11 side is electrically insulated from the arm bottom portion 11b of the first support arm 11 via the electrically insulating member 43 and the bolt 44. Similarly, the attach 31 on the side of the second support arm 12 is electrically insulated from the arm bottom portion 12b of the second support arm 12 via the electrically insulating member 43 and the bolt 44.

On the other hand, the wiring cable 32 penetrates the upper plate 41, and the other end 33b of the conducting wire 33 is electrically connected to the attach 31. Therefore, the current collector 20 and the attach 31 are electrically connected to each other through the lead wire 33 of the wiring cable 32.

The attach 31 is electrically connected to the other end 33b of the lead wire 33 of the wiring cable 32. Here, in the wiring cable 32, the conducting wire 33 that electrically connects the current collector 20 and the attach 31 is covered with an electrically insulating covering material 34.

It is preferable that the above-mentioned electric insulator 15, the covering material 34, and the electric insulating member 43 are all made of a resin material or a rubber material having an electric insulating property. Further, in the bolt 44 described above, it is preferable that the metal bolt member is covered with a resin material or a rubber material having electrical insulation.

As shown in FIG. 1, the hanger main body 10 has two connecting arms 17 that connect the mounting stay 40 on the first support arm 11 side and the mounting stay 40 on the second support arm 12 side at a lower position than the work W. It is equipped with. One connecting arm 17 connects one mounting stay 40 on the first support arm 11 side and one mounting stay 40 on the second support arm 12 side, and the other connecting arm 17 is on the first support arm 11 side. The other mounting stay 40 and the other mounting stay 40 on the second support arm 12 side are connected.

Next, with reference to FIGS. 4 and 5, the outline of the process for painting the work W on the factory production line of the work W will be described.

As shown in FIG. 4, the pretreatment step P1 is generally a step of performing a surface treatment and a cleaning treatment of the work W before the electrodeposition treatment is applied. The surface treatment of the work W is carried out by a pretreatment apparatus 60 provided with a pretreatment tank 61 in which the alkaline degreasing liquid L1 is stored. By immersing the work W in the pretreatment tank 61, the work W is pretreated with the degreasing liquid L1 to remove oil, dust and the like on the surface of the work W.

The electrodeposition step P2 is generally a step of performing an electrodeposition treatment and a cleaning treatment of the work W. The electrodeposition treatment of the work W is carried out by an electrodeposition coating apparatus 70 provided with an electrolytic cell 71 in which the acidic electrodeposition coating material L2 is stored. By immersing the work W in the electrolytic cell 71, the electrodeposition paint L2 is electrodeposited on the work W.

The electrodeposition coating device 70 includes a drive unit 50 that circulates the hanger 1 together with the work W between the electrolytic cell 71 and the pretreatment tank 61. Although not specifically shown, the drive unit 50 is for moving the transport rail 51 forming a circulation path between the pretreatment step P1 and the electrodeposition step P2 and the hanger 1 along the transport rail 51. It is composed of an actuator 52 such as an electric motor. By operating the actuator 52, the driven portion 13 (see FIG. 1) of the hanger 1 is guided along the transport rail 51.

According to the drive unit 50, the work W is immersed in the pretreatment tank 61 while being conveyed by the hanger 1 in the pretreatment step P1, and then the work W is continuously conveyed by the hanger 1 in the electrodeposition step P2 while being conveyed in the electrolytic cell. It can be immersed in 71. Then, while the work W is unloaded from the hanger 1 and transferred to the drying furnace 81, the hanger 1 is returned to the pretreatment step P1 by the drive unit 50 and used for transporting another work W. As described above, the hanger 1 is also used for transporting the work W in the pretreatment step P1 and the electrodeposition step P2.

The baking / drying step P3 is generally a step of drying the work W after the electrodeposition treatment is applied. This drying process is carried out by the drying apparatus 80 provided with the drying furnace 81 into which the work W is introduced.

As shown in FIG. 5, the electrodeposition coating apparatus 70 includes a hanger 1 having the above configuration, an electrolytic cell 71 in which the electrodeposition paint L2 is stored and an electrode 72 opposite to the conductive work W is immersed. It is provided with a power supply 73 for applying a DC voltage for electric wear between the work W immersed in the electrolytic cell 71 and the electrode 72.

In the electrodeposition coating apparatus 70, the hanger 1 is for immersing the work W in the electrolytic cell 71 in which the electrodeposition coating material L2 is stored while transporting the work W. With the work W immersed in the electrolytic cell 71, the hanger 1 is held so that the arm upper portions 11a and 12a of the two support arms 11 and 12 are both exposed above the electrodeposition paint L2.

When electrodeposition coating is applied to the work W in the electrolytic cell 71, a DC voltage with the work W side as the negative electrode is applied between the work W and the electrode 72 by the power supply 73 to energize the energized portion 30. At this time, a current flow as shown by the arrow in FIG. 5 is formed. Therefore, the particles of the positively charged electrodeposition coating material L2 move toward the work W by electrophoresis, precipitate on the surface of the work W, and are electrodeposited. As a result, a coating film is formed on the work W.

On the other hand, a current flows from the attach 31 toward the current collector 20 by bypassing the hanger main body 10 in the energization path C of the energization unit 30. At this time, since the hanger body 10 is not energized, no coating film is formed on the surfaces of the two support arms 11 and 12 of the hanger body 10.

If necessary, instead of this embodiment in which the DC voltage on which the work W side is the negative electrode is applied, a mode in which the DC voltage on the work W side is applied as the positive electrode can be adopted.

According to the above-mentioned reference form 1, the following effects can be obtained.

In the reference embodiment 1, when the work W is conveyed by the hanger 1 at the time of electrodeposition coating, the energization path of the energization unit 30 that directly connects the current collector 20 and the work W without using the hanger body 10 as the energization path. Use C to energize the work W. That is, the hanger 1 does not have an energizing function for passing a current between the current collector 20 and the work W, but has only a transport function of the work W.

Therefore, when the hanger 1 is immersed together with the work W in the electrolytic cell 71 in which the electrodeposition paint L2 is stored and a DC voltage for electrodeposition is applied between the work W and the electrode 72, the current collector 20 and the work. It is only energized between the hanger body 10 and the hanger body 10. Therefore, at the time of electrodeposition coating of the work W, a coating film is formed on the work W itself, while no coating film is formed on the outer surfaces of the two support arms 11 and 12 of the hanger body 10.

As a result, it is possible to prevent a coating film from being formed on the outer surface of the hanger 1 that conveys the work W during electrodeposition coating of the work W, and it is possible to reduce the number of man-hours required for cleaning the hanger 1.

It is assumed that deposits such as electrodeposition paint and water stains physically adhere to the outer surface of the hanger 1, but such deposits are different from the film strongly formed by the electrodeposition action. Since it can be easily removed by a cleaning process using a washing water shower or the like, the hanger 1 is not burdened with cleaning work.

Further, the hanger 1 circulates between the electrolytic cell 71 and the pretreatment tank 61 by the drive unit 50. Here, since the hanger body 10 is not energized in the electrolytic cell 71, it is difficult for a coating film to be formed on the outer surface thereof. Therefore, even when the hanger 1 is circulated between the electrolytic cell 71 and the pretreatment tank 61, the alkaline degreasing liquid of the pretreatment tank 61 and the acidic electrodeposition paint of the electrolytic cell 71 are applied to the outer surface of the hanger body 10. The amount of gelled agglomerates generated can be suppressed to a small level, and the man-hours required for the correction process for removing the agglomerates from the work W can be reduced.

According to the above-mentioned reference form 1, the current collector 20 and the work W are electrically connected by bypassing the hanger main body 10 by using the attach 31 and the wiring cables 32 and 32a which are the existing elements of the hanger 1. The energizing unit 30 can be constructed. Therefore, the cost required for the hanger 1 can be kept low.

According to the above-mentioned reference embodiment 1, it is effective to protect the wiring cables 32 and 32a by accommodating the wiring cables 32 and 32a in the tubular portions of the two support arms 11 and 12, respectively.

According to the above-mentioned reference form 1, the attach 31 on the first support arm 11 side and the attach 31 on the second support arm 12 side are indirectly connected via the mounting stay 40 and the connecting arm 17. Therefore, the support strength of the work in the attach 31 can be increased as compared with the case where the connecting arm 17 is not provided.
In particular, the reduction in rigidity that occurs when the sheet-shaped electrical insulating member 43 is used as a part of the mounting stay 40 can be compensated for by the connecting arm 17.

Further, by providing the connecting arm 17 on the hanger main body 10, it is possible to omit a connecting member that directly connects the first support arm 11 and the second support arm 12 at a higher place than the work W. In this case, when the deposit attached to the connecting member is peeled off, the work W located below the work W is easily affected. However, if the connecting arm 17 located below the work W is used instead of the connecting member, the work W is used. Is not easily affected by the deposits peeled off from the connecting arm 17.

According to the above-mentioned reference form 1, the structure for attaching the current collector 20 to the hanger main body 10 in the electrically insulated state is simplified by interposing the electric insulator 15 between the current collector 20 and the hanger main body 10. can.

As an example of modification particularly related to the above-mentioned reference form 1, only a part of the two support arms 11 and 12 for wiring the wiring cables 32 and 32a is a hollow cylindrical part, and the other parts are solid parts. It is also possible to adopt the structure of.

Hereinafter will be described with reference to the drawings other forms condition associated with reference embodiment 1 described above. In other forms state, the elements similar to those in Reference Embodiment 1 are denoted by the same reference numerals, description of the same elements will be omitted.

( Reference form 2)
As shown in FIG. 6, the hanger 101 of the reference form 2 is different from the hanger 1 of the reference form 1 in that the wiring cables 32 and 32a constituting the energizing unit 30 are arranged outside the hanger main body 10. There is.

As shown in FIGS. 6 and 7, the wiring cable 32 on the first support arm 11 side is not introduced from the current collector 20 into the pipe of the first support arm 11, but is on the outer surface of the first support arm 11. It is wired along (particularly, see the A1 portion in FIG. 6). Further, as shown in FIG. 6, the wiring cable 32a on the second support arm 12 side is not introduced from the current collector 20 into the pipe of the second support arm 12, but is along the outer surface of the second support arm 12. Is wired. The wiring cables 32 and 32a are bound to the first support arm 11 or the second support arm 12 by a resin binding member 35.

As shown in FIG. 8, the wiring cable 32 on the first support arm 11 side is wired from the current collector 20 to the arm bottom portion 11b along the outer surface of the first support arm 11, and then the upper plate of the mounting stay 40. It is configured to sequentially penetrate the 41 and the arm bottom portion 11b and be introduced into the pipe of the arm bottom portion 11b (see the B1 portion in FIG. 6).

Other configurations are the same as those of Reference Form 1.

According to the reference form 2, it is possible to provide the hanger 101, which is easier to perform during maintenance of the energizing unit 30 than the hanger 1 of the reference form 1.
In addition, it has the same effect as that of Reference Form 1.

As an example of modification particularly related to the above-mentioned reference form 2, a groove portion extending along the direction in which the wiring cables 32 and 32a are wired is provided on the outer surface of the two support arms 11 and 12, and the wiring cable is provided in this groove portion. It is also possible to adopt a structure in which a part or all of 32 and 32a are inserted.

(Embodiment 1 )
As shown in FIG. 9, the hanger 201 of the first embodiment, the arm bottom portion 11b of the first support arm 11, as in Reference Embodiment 1 and the mounting stay 40 having the same structure, different attachment structure from this attachment stay 40 A stay 240 and a stay 240 are provided. Similarly, a mounting stay 40 and a mounting stay 240 are provided on the arm bottom portion 12b of the second support arm 12.

Further, the mounting stay 240 on the first support arm 11 side and the mounting stay 240 on the second support arm 12 side are connected by the connecting arm 17. On the other hand, the mounting stay 40 on the first support arm 11 side and the mounting stay 40 on the second support arm 12 side are not connected by a member such as the connecting arm 17. That is, the arm bottom portion 11b of the first support arm 11 and the arm bottom portion 12b of the second support arm 12 are connected using only one connecting arm 17.
It is different from the hanger 1 of the reference form 1.

As shown in FIGS. 10 and 11, the mounting stay 240 is covered with a metal upper plate 41 welded to the base end portion 31a of the attach 31 and a ring-shaped electrical insulating member 243 on the outer peripheral surface. It has a bracket 42 for sandwiching the bottom portion 11b of the arm with the upper plate 41. The electrical insulating member 243 is preferably made of a resin material or a rubber material having electrical insulating properties, similarly to the electrical insulating member 43 of Reference Form 1. The upper plate 41 and the bracket 42 are fastened and fixed with metal bolts 244.

Therefore, the attach 31 on the side of the first support arm 11 is electrically insulated from the arm bottom portion 11b of the first support arm 11 via the electrically insulating member 243. Although not particularly shown, the attach 31 on the side of the second support arm 12 is electrically insulated from the arm bottom portion 12b of the second support arm 12 via the electrically insulating member 243.

Here, the arm bottom portion 11b of the first support arm 11 has a solid shaft-shaped weight portion 11c, and the weight portion 11c is sandwiched between the upper plate 41 of the mounting stay 240 and the bracket 42. The weight portion 11c is preferably made of solid metal. Although not particularly shown, the arm bottom portion 12b of the second support arm 12 also has a weight portion similar to the weight portion 11c, and this weight portion is sandwiched between the upper plate 41 of the mounting stay 240 and the bracket 42. ..

A ring-shaped plate member 245 is provided on the outer periphery of the electrically insulating member 243. The plate member 245 is made of a metal material and functions to prevent wear of the electrical insulating member 243 by preventing the electrical insulating member 243 from coming into direct contact with the upper plate 41 and the bracket 42.

The wiring cable 32 penetrates the weight portion 11c after the hollow portion 11d of the arm bottom portion 11b is wired, and the other end portion 33b of the conducting wire 33 is sandwiched between the upper plate 41 and the bracket 42. Therefore, the attach 31 is electrically connected to the other end 33b of the lead wire 33 of the wiring cable 32. On the other hand, the weight portion 11c is not electrically connected to the other end portion 33b of the lead wire 33 of the wiring cable 32.

In this case, by configuring the wiring cable 32 so as to penetrate the weight portion 11c, it is possible to suppress the infiltration of the liquid into the hollow portion 11d. Further, in order to enhance the effect of this suppression, the arm bottom portion 11b has a partition wall 11e for preventing liquid from entering the hollow portion 11d and a drain used for draining the drain accumulated in the hollow portion 11d. It is preferable to provide a stopper bolt 11f.

Other configurations are the same as those of Reference Form 1.

According to the first embodiment, by coating the respective outer peripheral surfaces of the arm bottom portion 11b and the arm bottom portion 12b of the second support arm 12 of the first support arm 11 of electrically insulating member 243, fastening the top plate 41 and the bracket 42 A general-purpose inexpensive bolt 244 can be used for fixing.

Further, the mounting stay 240 that sandwiches the heavy weight portion 11c of the first support arm 11 and the mounting stay 240 that sandwiches the heavy weight portion of the second support arm 12 are connected to each other via the connecting arm 17. By doing so, the strength of the entire hanger 201 can be increased. In this case, the number of connecting arms 17 can be suppressed to one.
In addition, it has the same effect as that of Reference Form 1.

The present invention is not intended to be limited to only exemplary shaped state described above, various applications and modifications are considered without departing from the object of the present invention. For example, the following embodiments to which the above-described embodiments are applied can also be implemented.

In the above-described embodiment, the case where the hanger main body 10 has two support arms 11 and 12 is illustrated, but the number of members corresponding to the support arm 11 is one or three depending on the shape of the work W and the like. It can also be set to the above.

In the above-described embodiment, the case where the mounting stays 40 and 240 on the first support arm 11 side and the mounting stays 40 and 240 on the second support arm 12 side are connected by the connecting arm 17 has been illustrated, but the mounting stays 40 and 240 have been exemplified. When the support strength of the attach 31 to the work W can be secured only by itself, the connecting member that directly connects the arm bottom portion 11b of the first support arm 11 and the arm bottom portion 12b of the second support arm 12 instead of the connecting arm 17. Can also be used.

In the above-described embodiment, the case where the current collector 20 is electrically connected to the work W via the attach 31 and the wiring cables 32 and 32a is illustrated, but in the reference embodiment, the current collector 20 is the attach 31 and the wiring cable 32. It is also possible to adopt a structure in which the work W is directly electrically connected to the work W via another connecting means without using the or 32a. Such a structure also corresponds to a structure related to the form of "electrically connecting the current collector and the work held by the hanger body by bypassing the hanger body."

In the above-described embodiment, the case where the hangers 1, 101, 201 are also used for transporting the work W in the pretreatment step P1 and the electrodeposition step P2 has been illustrated, but the hangers 1, 101, 201 are used only for the electrodeposition step P2. Of course, it can be used as a dedicated transport means.

In the above-described embodiment, the electrodeposition coating technology in the factory production line of the automobile body has been exemplified, but this technology can be applied to the electrodeposition coating technology in the factory production line that produces workpieces other than the automobile body, for example, home appliances and building materials. It can also be applied.

1,101,201 Electrodeposition coating hanger (hanger)
10 Hanger body 11 1st support arm (support arm)
11b, 12b Arm bottom 11c Weight part 12 Second support arm (support arm)
15 Electrical insulator 16 Connecting arm 17 Connecting arm 20 Current collector 30 Currenting part 31 Attach 32, 32a Wiring cable 33 Conductor 34 Covering material 40, 240 Mounting stay 41 Top plate 42 Bracket 43, 243 Electrical insulation member 44, 244 Bolt 50 Drive Part 61 Pretreatment tank 71 Electrolysis tank 72 Electrode 73 Power supply L1 Degreasing liquid L2 Electrodeposition paint W work

Claims (8)

A hanger for electrodeposition coating that conveys a conductive workpiece during electrodeposition coating.
The hanger body that holds the above work and
The current collector attached to the hanger body in an electrically insulated state,
An energizing unit that electrically connects the current collector and the work held by the hanger body by bypassing the hanger body.
Equipped with
The hanger body has at least one support arm that supports the work.
The energizing portion is provided at the bottom of the support arm located below the work so as to be in contact with the work, and is electrically insulated from the support arm. It has a wiring cable in which a conducting wire electrically connected to the attachment is covered with an electrically insulating coating material.
The support arm is configured as a tubular tube having a hollow portion for wiring the wiring cable.
The bottom of the support arm is provided with a partition wall for partitioning the hollow portion and a drain stopper bolt used for draining the drain accumulated in the hollow portion partitioned by the partition wall. There is a hanger for electrodeposition coating. The above hanger body is
The first support arm and the second support arm as the support arm,
A mounting stay provided integrally with the attachment at the bottom of each of the first support arm and the second support arm, and
A connecting arm that connects the mounting stay on the first support arm side and the mounting stay on the second support arm side at a lower position than the work.
The hanger for electrodeposition coating according to claim 1. The mounting stay has an upper plate joined to the attachment and a bracket that sandwiches a sheet-shaped electrical insulating member between the upper plate and sandwiches the bottom of the arm. The electrodeposition coating hanger according to claim 2, which is configured to be fastened and fixed with an electrically insulating bolt. The mounting stay has an upper plate joined to the attachment and a bracket for sandwiching the bottom of the arm whose outer peripheral surface is covered with an electrically insulating member between the upper plate and the upper plate and the bracket. The electrodeposition coating hanger according to claim 2, wherein the hanger is configured to be fastened and fixed with a bolt. The electrodeposition according to claim 4, wherein the bottom of the arm has a solid shaft-shaped weight portion, and the weight portion is configured to be sandwiched between the upper plate of the mounting stay and the bracket. Painting hanger. The electrodeposition according to any one of claims 1 to 5, wherein the current collector is configured to be attached to the hanger body with an electrical insulator interposed between the hanger body and the hanger body. Hanger for painting. An electrolytic cell in which the electrodeposition paint is stored and an electrode that is the opposite electrode of the conductive work is immersed, a hanger for immersing the work in the electrolytic cell while transporting the work, and the work immersed in the electrolytic cell. A power supply that applies a DC voltage for electrolysis between the electrode and the above electrode is provided.
The hanger is an electrodeposition coating apparatus including the electrodeposition coating hanger according to any one of claims 1 to 6. A pretreatment tank that pretreats the work with a degreasing liquid before electrodeposition of the electrodeposition paint,
A drive unit that circulates the hanger together with the work between the electrolytic cell and the pretreatment tank.
7. The electrodeposition coating apparatus according to claim 7.

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