JPH0556962U - Electric device for electroplating - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a current-carrying device for electroplating without brush burning. [Structure] A conductive plate is brought into contact with a metal plate fixed to a roll shaft of a conductor roll, and frictional heat generated is radiated through the metal plate. [Effect] No burning of the current-carrying brush was observed despite continuous use for half a year.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an electroplating energizing device that energizes a conductor roll during electroplating.

[0002]

[Prior Art]

 Conventionally, when energizing in a continuous electroplating line, an energizing brush is arranged so as to wrap it around the roll shaft of the conductor roll. FIG. 1 is a schematic perspective view showing such a conventional energizing device. A pair of energizing brushes 3 are provided in contact with a roll shaft portion 2 of a conductor roll 1 so as to wrap it around the roll shaft portion 2. The energizing brush 3 is pressed against the roll shaft portion 2 by the pressure adjusting spring 4. The shape of the portion where the current-carrying brush 3 is in contact with the roll shaft portion 2 is a split cylindrical shape that matches the diameter of the roll shaft portion 2. While the current-carrying brush 3 is in contact with the rotating roll shaft portion 2, It is energized. This is to secure a sufficient contact area and perform stable energization.

However, in such a conventional apparatus, since the roll shaft portion rotates while being in contact with the current-carrying brush, frictional heat is generated, and there is a high probability that seizure occurs between the current-carrying brush and the roll shaft portion during long-term use. .. Since the conventional energizing brush has a shape that wraps around the roll shaft, it is difficult for the frictional heat generated between the conducting brush and the roll shaft to radiate to the outside, and heat accumulates in the contact area. , It is considered that the temperature gradually rises and seizure occurs.

Until now, for example, the following means have been taken as a method for solving such a drawback.

(1) The pressure for bringing the energizing brush into contact with the roll shaft is weakened. However, with this method, if the contact pressure is weakened too much, a current flow failure may occur, causing an obstacle to the plating operation itself. (2) As shown in FIG. 2, the heat generated by the energizing brush 3 is monitored by the thermometer 5, and when the temperature exceeds a preset temperature, the fan 6 automatically rotates to cool the energizing brush 3 by air. However, with this means, the method of air-cooling with the fan 6 is inferior in cooling capacity, and is less effective especially when the outside temperature is high.

(3) As shown in FIG. 3, a cooling pipe 7 is installed in the energizing brush 3, and cooling water is passed through the pipe 7 to cool the entire energizing brush. The water-cooling method is the most effective of the conventional methods, but even if such measures are taken, the cooling effect does not extend to the vicinity of the contact area between the energizing brush and the roll shaft, which is a considerable improvement over the air-cooling method. However, the problem of burn-in is unavoidable.

Further, recently, as described in JP-A-61-213388, special plating may be performed using a plating solution (molten salt plating) having a high temperature of 150 to 200 ° C. .. In such a high temperature environment, the conductor roll itself is also exposed to the high temperature environment, so that the temperature of the roll shaft also rises due to heat transfer. If the conventional energizing method is adopted for such conductor rolls, seizure troubles will occur more frequently, which will seriously affect production. Even with the water-cooled type, it is inevitable that seizure will occur in a relatively short time.

[0008]

[Problems to be solved by the device]

 The present invention efficiently cools the frictional heat generated between the current-carrying brush and the roll shaft, which is the cause of seizure, so that even in any electroplating method including molten salt electroplating, the current-carrying device can be stably energized without being burned for a long time. Is to provide.

[0009]

[Means for Solving the Problems]

 It has already been mentioned that the cause of the seizure is that the frictional heat generated by the contact between the current-carrying brush and the conductor roll is not quickly dissipated and the contact area with the electric brush is not sufficiently cooled. As a result of various investigations, the inventors arrived at the present invention after paying attention to whether this frictional heat cannot escape to the outside due to the contact structure of the energizing brush.

That is, the gist of the present invention is a current-carrying device comprising a conductor roll used for electroplating and a current-carrying brush, wherein the roll of the conductor roll is a metal plate fixed to its shaft. In the electroplating energizing device, at least one energizing brush is provided in contact with the metal plate.

As described above, according to the present invention, the current-carrying brush is not brought into direct contact with the conductor roll shaft portion, but the current-carrying brush → the metal plate → the roll shaft portion is passed through the metal plate having good conductivity. By doing so, the thermal conductivity in the metal plate is utilized to efficiently disperse and radiate frictional heat.

[0012]

[Action]

 The present invention will now be further described with reference to the accompanying drawings. FIG. 4 is a schematic perspective view of a current-carrying device according to the present invention. In the figure, a disk-shaped metal plate 10 having a central hole is attached to a roll shaft 2 of a conductor roll 1, and both surfaces thereof are attached. An energizing brush 12 is appropriately pressed and supported by a contact pressure adjusting spring 14.

The metal plate needs to be electrically connected to the roll shaft portion. The conduction method may be, for example, a method in which the metal plate itself is shrink-fitted onto the roll shaft portion or fixed by welding, and the doughnut-shaped metal plate is previously brought into contact with the roll shaft portion and the metal plate It may be joined with bolts. In either case, the electricity supplied from the energizing brush 12 may be transmitted to the conductor roll 1.

FIG. 4 shows an example in which a doughnut-shaped metal plate 10 is shrink-fitted onto the roll shaft portion 2. FIG. 5 shows another mode of attachment of the metal plate 10. The metal plate 10 is welded to the roll shaft portion 2. FIG. 6 shows still another embodiment, in which the metal plate 10 is bolted to the roll shaft portion 2 via a flange 16.

In any of the embodiments, the metal plate 10 may be any one having conductivity, for example, a metal plate such as copper, aluminum or iron, but in order to enhance the cooling effect, one having good conductivity, For example, copper, aluminum, iron and the like are preferable. The shape of the metal plate is not particularly limited, but the disk shape requires a smaller installation space. Further, the contact position between the current-carrying brush and the metal plate is preferably provided separately from the roll shaft portion, and it is preferable that the contact is made on the outermost side of the metal disc. This is because if the distance from the roll shaft is too close, it becomes difficult for the frictional heat to dissipate.

In the cooling method, the metal plate itself can radiate heat directly to the atmosphere, so that the frictional heat generated between the energizing brush and the metal plate is cooled by the metal plate itself. If necessary, the metal plate itself may be forcibly cooled by air cooling with a fan or the like. The form and number of the current-carrying brushes are not particularly limited, and may be, for example, flat and sandwiched from both sides of a metal plate, or may be a method of contacting only one side to conduct current. The number of energizing brushes may be one or more. As for the material, carbon may be used as in the conventional case.

FIG. 7 shows a schematic perspective view of the energizing brush. According to this, the contact area is smaller than before, but this can be dealt with by increasing the number of energizing brushes, while the contact area of each energizing brush is small, so quick heat dissipation occurs, so that heat does not accumulate in the contact area. Not seen. In addition, the structure is such that the energizing brushes 12 are sandwiched from both sides of the metal plate and pressed by the hydraulic cylinder 15 or a burner so that the energizing brushes 12 can follow the displacement even if the metal plate bends. Stable energization can be achieved by connecting the parts to the universal coupling 16 via the universal coupling 16. In addition, if a large number of energizing brushes are used, even if one of them has a poor contact, it can be covered by another, so that stable energization can be achieved as a whole. Next, the present invention will be described more specifically with reference to its embodiments.

[0018]

【Example】

(1) Example of application to zinc-based electroplating equipment As shown in Fig. 4, a copper shaft with a diameter of 1 m and a thickness of 6 mm is shrink-fitted onto the roll shaft 2 of the conductor roll 1 from both sides of this metal disk. Energization was performed with a brush having an area of 30 cm ² .

(2) Example of application to molten salt electrolytic plating apparatus In an electrolytic plating apparatus using a molten chloride salt at 200 ° C., as shown in FIG. 6, the shaft portion of the conductor roll is made of aluminum and has a diameter of 1 m and a thickness of 8 mm. The disc was fixed with bolts, and electricity was applied from both sides of the metal disc with a brush having an area of 30 cm ² . As a comparative example, the water cooling device shown in FIG. 3 of the conventional method was used to investigate whether seizure would occur in half a year.

[0020]

[Table 1]

The results are shown in Table 1. In the conventional device, the temperature of the contact portion of the brush is higher than that of the device of the present invention in 2 months in the application example of (1) and in about 0.5 months in the application example of (2). In contrast to the burn-in, the current-carrying device according to the present invention did not burn-in at all during the experimental period in any of the application examples.

[0022]

[Effect of the device]

 It has been found that even with any plating method, stable electricity can be supplied for a long period of time without seizure.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a conventional electroplating current-carrying device.

FIG. 2 is a schematic perspective view of another conventional electroplating current-carrying device.

FIG. 3 is a schematic perspective view of another conventional electroplating current-carrying device.

FIG. 4 is a schematic perspective view of a current carrying device for electroplating according to the present invention.

FIG. 5 is a schematic perspective view illustrating a method of fixing a metal plate to a roll shaft according to the present invention.

FIG. 6 is a schematic perspective view illustrating another fixing method of a metal plate on a roll shaft according to the present invention.

FIG. 7 is a schematic perspective view of a current-carrying brush used in the present invention.

[Explanation of symbols]

 1: Conductor roll 2: Roll shaft part 3: Energizing brush 4: Contact pressure adjusting spring 5: Thermometer 6: Fan 7: Pipe 10: Metal plate 12: Energizing brush 14: Contact pressure adjusting spring 15: Hydraulic cylinder 16 : Universal coupling

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Junichi Uchida 4-53-3 Kitahama, Chuo-ku, Osaka City Sumitomo Metal Industries, Ltd. (72) Hirohisa Seto 4-53-3 Kitahama, Chuo-ku, Osaka Sumitomo Metal Industries, Ltd. (72) Inventor Ken Abe 4-533 Kitahama, Chuo-ku, Osaka City Sumitomo Metal Industries, Ltd. (72) Kunihiro Fukui 4-53 Kitahama, Chuo-ku, Osaka Sumitomo Kinzoku Kogyo Co., Ltd. (72) Inventor Junkichi Yoneda 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima Mitsubishi Heavy Industries, Ltd. Hiroshima Works (72) Inventor Ritsuo Hashimoto 4-22 Kannon Shinmachi, Nishi-ku, Hiroshima Mitsubishi Heavy Industries, Ltd. Hiroshima Research Institute (72) Toshio Taguchi 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City Mitsubishi Heavy Industries Ltd. Hiroshima Research Institute

Claims (1)

[Scope of utility model registration request] 1. A current-carrying device comprising a conductor roll 1 and a current-carrying brush 3 used for electroplating, wherein the conductor roll 1 has a metal plate 10 fixed to a roll shaft portion 2 thereof. Reference numeral 3 denotes an electroplating current-carrying device which is provided in contact with the metal plate 10 and at least one of which is provided.