JPH08239794A - Conductor roll and electroplating device for strip - Google Patents

Abstract

PURPOSE: To save the installation space of a current collecting part and bus bar and to reduce the cost in an electroplating device for strips. CONSTITUTION: This electroplating device is provided with the current collecting part of a conductor roll only on the drive side (right side) and the thickness of the boss pat 2b on the current collecting part side is made thinner than the thickness 2c of the boss part on the opposite side, by which the electric resistance to the left side end 2j of the roll shell and the electric resistance to the right side end 2k of the roll shell from the current collecting part are made equal to each other. As to the rest, the boss part 2b and the boss part 2c may be formed of different materials and the lowering of the resistance of the part 2g between the boss part 2b of the shaft part 2d and the boss part 2c is equally well. The current collecting parts which are heretofore disposed on both sides are decreased to one side alone and, therefore, the installation space of the current collecting part is saved and the cost is reduced. If the energizing bus bar (now shown in Fig.) of an anode plate is disposed on the drive side alone, the installation space thereof and the cost are reduced as well.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductor roll and a strip electroplating device for energizing the strip when it is electroplated.

[0002]

2. Description of the Related Art Conventionally, when electroplating is performed on a plate-like material having electrical conductivity and flexibility (hereinafter referred to as a strip) such as a steel plate or a stainless steel plate, it is usually performed as shown in FIG. It was That is, the bus bars 61a for energization were taken out from both upper ends of the anode 61 arranged in a plating tank (not shown) so that the current could be uniformly applied to both ends in the width direction of the strip. Next anode 6
In the conductor roll 62 arranged on the upper part of 1, the current collectors 62b were arranged at both ends of the shaft portion 62a. Then, the pair of current collectors and the pair of bus bars 61a.
Are connected by a power supply unit 64 and a rectifier 65 provided on the drive side (the side on which the drive motor 63 of the conductor roll 62 is provided) of the left and right.

[0003]

As described above, the bus bar 6
Since the pair of left and right 1a and the current collector 62b are provided, the bus bar 61a and the current collector 6 are provided on the left and right respectively.
There was a problem that a large space for arranging 2b had to be secured. In particular, on the work side of the left and right (the side on which the work floor is stretched for work by workers, inspection, etc.), by securing this space, the work floor and the work space of the worker are reduced, There is a problem that the workability of the worker is deteriorated, such as inspection and repair of the strip 66 and rolls in the plating tank.

Further, since a pair of bus bars 61a and current collectors 62b are provided on the left and right sides, respectively, there is a problem that the cost of installing the bus bars 61a and current collectors 62b increases.

Further, when the bus bars 61a and the current collecting portions 62b are provided on the left and right sides so that the current flows evenly on the left and right sides of the strip, the left and right current collecting portions 62b have different degrees of change in electric resistance with time. , The busbars on the left and right have different electrical resistance values, and the amounts of the plating solution scattered from the plating tank are different, so that the corrosion degree is different and the electrical resistance values are different. As a result, there is a problem that the current flowing to the left and right parts of the strip becomes nonuniform over time. That is,
If the current becomes uneven, the coating weight becomes uneven in the width direction. The nonuniformity of the basis weight can be eliminated by correcting the distance between the anode and the strip, but the nonuniformity of the current is not preferable because it causes a local arc spot.

Therefore, it is an object of the present invention to provide a conductor roll and strip electroplating apparatus which solves these problems.

[0007]

In order to achieve the above object, the conductor roll of the present invention has a roll shell around which a strip is wound, a shaft portion, and a roll shell positioned at a fixed position with respect to the shaft portion. In a conductor roll having a boss portion located between the two, a means for arranging the current collecting portion on only one side and equalizing the electric resistance from the current collecting portion to both ends of the strip wound around the roll shell is provided. Provided.

The thickness of the boss portion on the side of the current collecting portion may be smaller than the thickness of the boss portion on the side opposite to the side of the current collecting portion.

For example, the boss on the side of the current collector is made of stainless steel and the boss on the side opposite to the side of the current collector is made of steel. The material of the boss portion may be selected so as to be larger than the electric resistance of the boss portion on the opposite side.

A part or all of the material of the shaft portion between the boss portions is changed so that at least the boss portion of the shaft portion has a low electric resistance, and / or the surface of the shaft portion between the boss portions has a low electric resistance. The material may be attached and / or the shaft portion between the boss portions may have a large diameter.

To achieve the above object, the strip electroplating apparatus of the present invention has any one of the above conductor rolls and an anode having a bus bar only on the side of the current collector.

[0012]

Even if the conductor roll is arranged only on one side, a means for equalizing the electric resistance from the current collector to both ends of the strip wound around the roll shell is provided. The electrical resistances from the electrical part to the ends of the strip wrapped around the roll shell can be made equal to each other. The anode, on the other hand, is usually made of an electroplated material such as tin or zinc,
Since the electric resistance is low, when the busbar is provided only on one side of the anode, a current flows from the busbar to the left and right ends of the anode with substantially the same electric resistance. Therefore, by combining these, the electric resistance of the current flowing through the left and right ends of the strip can be made equal, and the strip electroplated to the left and right ends with the same thickness can be obtained. As a result, the installation base and cost of the current collector and busbar are greatly reduced, and since only one current collector and busbar are provided, the change in the electrical resistance of the current collector and busbar due to aging does not change. ,
It acts equally on changes in the electrical resistance of the current passing through the left and right ends of the strip, thus preventing them from making a difference.

Even when the conductor roll of the present invention is used and the anode is provided with bus bars on both right and left portions as in the conventional case, only one current collector is provided. In addition, the installation base can be reduced, the cost can be reduced, and the occurrence of a difference in electric resistance due to a change with time of the left and right current collectors can be prevented. When the electric resistance of the anode is not necessarily small, it is preferable to provide busbars on both sides of the anode and implement the present invention only for the current collector.

[0014]

First, a first embodiment of the present invention will be described in detail with reference to the drawings. 2 is a front explanatory view of the strip electroplating apparatus, and FIG. 3 is a sectional view taken along line BB of FIG.

2 and 3, the plating tank 1 (see FIG.
, A pair of conductor rollers 2 having a width of more than 1 m are arranged at a constant interval above the strip (4), a reversing roller 3 is arranged at the bottom of the plating tank 1, and the strip 4 is The pair of conductor rollers 2 and the reversing roller 3 are wound around and wound around. A pair of opposing anodes 6 that sandwich each strip in the plating tank 1 in close proximity are provided. A predetermined plating solution (not shown) is placed in the plating tank 1.

Next, the conductor roll will be described in detail. FIG. 1 shows an enlarged view of the longitudinal section. The roll shell 2a of the conductor roll 2 is STKM13A.
It is formed in a cylindrical shape (hollow shape) using a carbon steel material (JIS). Then, boss portions 2b and 2c of a donut-shaped disc are fitted to both ends thereof, and the boss portions 2b and 2c are fitted to a shaft portion 2d described later. Therefore, the roll shell 2a is separated from the shaft portion 2d penetrating the boss portions 2b, 2c at a fixed position via the boss portions 2b, 2c. The boss 2b on the side closer to the current collector (described later) is made of stainless steel made of SUS304 (JIS), and the boss 2c on the side farther from the current collector is SS4.
The steel material made of 00 (JIS) is used, and the thickness of the boss portion 2b on the side of the current collecting portion is smaller than the thickness of the boss portion 2c on the side opposite to the side of the current collecting portion. The electrical resistance of the boss portion 2b on the side of the current collecting portion is higher than the electrical resistance of the boss portion 2c on the side opposite to the side of the current collecting portion. Note that a certain relationship is set between these (described later). The shaft portion 2d is made of an S25C (JIS) carbon steel material and is supported by a pair of left and right bearings 7 so as to be rotatable.
Are extended and connected to the drive motor 8. And
The diameter of the portion 2g of the shaft portion 2d between the pair of bosses 2b and 2c is increased, and the electric resistance of this portion of the shaft portion 2d is reduced accordingly. Next, the current collector 9 is arranged on the drive-side shaft 2d. Explaining this, the slip ring 9a is fixed to the shaft portion 2d (see FIG. 4 showing a cross-sectional view taken along the line BB), and the electric brush 9 is used.
b is pressed by a predetermined pressing member 9c whose one end side is fixed to a predetermined frame (not shown) and is in contact with the slip ring 9a. Therefore, the current flows from the rotating slip ring 9a to the fixed electric brush 9b.
Then, as shown in FIG. 1, one power supply unit 11 is arranged on the drive side, and a pair of conductor rolls 2 are provided.
Each of the electric brushes 9b is connected to the power supply unit 11. Since the current collector 9 is provided only on the drive side, the installation space and cost can be reduced by half compared to the case where it is provided on both sides.

Next, as shown in FIG. 6, the electric resistance of the portion 2g of the shaft portion 2d between the pair of bosses 2b and 2c is resistance 1, and the electric resistance of the boss portion 2b on the side of the current collecting portion is resistance. 2, assuming that the electric resistance of the boss portion 2c on the side opposite to the current collecting portion side is resistance 3 and the electric resistance of the roll shell 2a is resistance 4, the electricity from the current collecting portion 9 to the right end portion 2j of the roll shell 2a is The electrical resistance relationship between the boss 2b and the boss 2c is set so that the resistance and the electrical resistance up to the left end portion 2k are equal, that is, the resistance 2 = the resistance 1 + the resistance 3.
In order to set this relationship accurately, it was calculated in advance,
After assembling and manufacturing the conductor roll 2 shown in FIG. 3, which includes the boss portions 2b and 2c having a necessary thickness for satisfying the conditions of the above calculation formula, the roll shell 2a, and the shaft portion 2d, the shaft portion 2d From the root 2h of the right boss 2b,
While actually measuring the electric resistance up to the right end 2j and the left end 2k of the roll shell 2a, the outer surface 2m of the right boss 2b or the outer surface 2n of the left boss 2c is measured.
So that the above relational expression can be obtained accurately.
Actually, it is necessary to set not the electric resistance up to the right end 2j and the left end 2k of the roll shell 2a, but the electric resistance up to the left and right ends of the strip 4 wound around the surface of the roll shell 2a. Strip 4
Has a small thickness, so that the conductor roll 2 set by the above method has a sufficient accuracy and is equal to the electric resistance up to the left and right ends of the strip 4.

Next, the anode 6 will be described in detail. As shown in FIG. 3, a horizontal bar 6a is attached to the head of each of the four anodes 6 (see FIG. 1), and the anodes 6 are suspended by suspending them in a predetermined frame (not shown) or the like. It is suspended in the plating tank 1. The anode 6 is a tin plate,
The anode 6 has a very low electric resistance because it is made of a plate such as a zinc plate which is electroplated on the surface of the strip, and is usually made of a material such as tin or zinc. A bus bar 6b is fixed to the upper part of the anode 6 only on the drive side.
b is made of a material having a small electric resistance, for example, a copper material, and the bus bars 6b (4
All of the two bus bars 6b) are connected to one power supply unit 11 via one rectifier 12 provided on the drive side. Therefore, all the current that has passed through the power supply unit 11 and the rectifier 12 flows to each anode 6 via the bus bar 6b provided on the drive side. Since the bus bar 6b is provided only on the drive side, that is, there is no long bus bar arranged on the work side through the lower side of the conventional plating tank 1, the installation space and The cost is reduced significantly. The anode 6 may be insoluble as well as soluble.

Next, the left side of FIG. 2 is the work side, and a work floor (not shown) is stretched. Since there is no current collector and bus bar on the work side, a work floor of a sufficient size is obtained, and since there is no work floor, a sufficient work space is secured.

Next, the operation will be described. 2 and 3,
A predetermined plating solution is put in the plating tank 1, the drive motor 8 is driven, the conductor roller 2 is rotated, the strip 4 is run, and power is supplied from the power supply unit 11. Then, the electric power flows to each anode 6 through the four bus bars 6b via the rectifier 12. As described above, the electric resistance of the anode 6 is usually extremely small, so that in each anode 6, a current can flow almost equally to the left and right ends of the anode 6. Next, ions of the material of the anode plate 6 flow out from the anode plate 6 into the plating solution, the ions reach the opposite strip 4, and an electroplating layer of the material of the anode 6 is formed on the strip surface. The current from the ions travels upward through the strip 4 and into the roll shell 2a of the conductor roll 2.
Then, the current of the roll shell 2a flows to the shaft portion 2d through either the left or right boss 2b or 2c, and the current collector 9
Go in the direction of. Since the relationship of resistance 2 = resistance 1 + resistance 3 is established here, the current flowing through the right end portion 4j of the strip is equal to the current flowing through the left end portion 4k of the strip, so that the strip 4 has a uniform plating thickness on the left and right sides. Is obtained. After that, the current passes through the current collector 9 and the power supply 1
Go to 1.

In this way, the running strip 4 is continuously electroplated with a uniform thickness at the left and right ends. Next, when the contact electric resistance between the slip ring 9a and the electric brush 9b of the current collector 9 changes due to aging, this change is caused by the path flowing through the right end 4j of the strip and the left end of the strip. Since it acts equally on any of the paths flowing through the section 4k, the electrical resistance of each path increases while remaining equal. Further, since the plating solution in the plating tank 1 is scattered and adhered, even when the electric resistance of the bus bar 6b changes, both the current path flowing to the left end and the current path flowing to the right end of the anode 6 pass through the bus bar 6b. , The electrical resistance of each of these paths increases while remaining equal. As a result, even after aging, the electrical resistances passing through the left and right ends of the strip are equal, and therefore the plating thickness of these portions can be kept equal.

Next, for inspection, maintenance, repair, etc., the worker stands on the work floor on the work side and performs these works.
Since a large work floor and work space are available, the worker can perform these works with sufficiently good workability.

In the first embodiment, the bosses 2b and 2c are made of different materials and have different electrical resistances, but of course, only the material or the thickness is changed.
It is also possible to implement the invention.

Further, in the first embodiment, the pair of boss portions 2b and 2c are provided at both ends of the roll shell.
Even if a boss is provided in the middle of b and 2c,
Of course, the present invention can be implemented, for example, by increasing the resistance of the boss portion closer to the current collecting portion and decreasing the resistance of the boss portion farther from the current collecting portion. .

Next, as a second embodiment of the present invention, the boss portion 2
b and 2c may be made of the same material and have the same thickness, and a copper member or the like may be attached to the surface of the portion 2g between the boss portions so that at least the portion 2g between the boss portions of the shaft portion 2d has a low electric resistance. (Not shown). By doing this,
In FIG. 6, the resistance 1 becomes smaller, while the boss 2b,
2c is a material containing iron in order to maintain normal strength, and has a high electric resistance value, so that resistance 2 = resistance 1 + resistance 3 is almost obtained, and therefore both left and right end portions 2j, 2k of the strip are
A current equal to can be passed. 2g part between bosses
The same effect can be obtained by attaching a member having a low electric resistance or the like on the surface of the above, or by changing a part or all of the shaft portion 2g itself between the boss portions to a material having a low electric resistance.

Next, of course, the present invention may be implemented by combining these first and second embodiments.

Next, as a third embodiment of the present invention, even when the conductor roll of the present invention is used and the anode is provided with bus bars on the left and right portions as in the conventional case, the current collecting portion is Since it becomes one, the installation base will be smaller and the cost can be reduced.
This also prevents the occurrence of a difference in electrical resistance between the conventional left and right current collectors over time. As described above, the present invention uses only the conductor roll of the present invention, and the anode is provided with bus bars on the left and right parts as in the conventional case.
To include. When strips are electroplated with a material whose electrical resistance is not necessarily low, that is, when the electrical resistance of the anode is not always low, it is preferable to provide busbars on both sides of the anode. Carry out the invention.

[0028]

Since the present invention is configured as described above, the installation space and cost of the current collector and the anode are reduced, and the difference between the currents flowing in the left and right parts of the strip due to aging is prevented from occurring. It is possible to obtain a large work floor and ensure sufficient workability for workers.

Even when the current collector is provided only on one side, the installation space and cost of the current collector are reduced, and the difference between the currents flowing in the left and right portions of the strip due to aging is further reduced. In addition, since one current collector is eliminated, a large work floor can be obtained and a sufficient workability of the worker can be secured.

[Brief description of drawings]

FIG. 1 is an enlarged longitudinal sectional view of a conductor roll according to a first embodiment of the present invention.

FIG. 2 is a front explanatory view of a plating apparatus of the present invention using the conductor roll of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is a sectional view taken along line AA of FIG. 1;

FIG. 5 is an explanatory diagram showing a path of current flow in the conductor roll of FIG.

FIG. 6 is an explanatory view schematically showing the electric resistance of the conductor roll of FIG.

FIG. 7 is a front explanatory view of a conventional strip electroplating apparatus.

[Explanation of symbols]

 2 conductor roll 2a roll shell 2b boss portion on the side of the current collecting portion 2c boss portion on the side opposite to the current collecting portion side 2d shaft portion 4 strip 6 anode 6b bus bar 9 current collecting portion

Claims (5)

[Claims] 1. A roll shell around which a strip is wrapped,
In a conductor roll having a shaft portion and a boss portion located between the shaft shell and the shaft shell in order to position the roll shell at a fixed position, the current collecting portion is arranged only on one side, And a means for equalizing electric resistance from the end portion to both ends of the strip wound around the roll shell. 2. The structure according to claim 1, wherein the thickness of the boss portion on the side of the current collecting portion is smaller than the thickness of the boss portion on the side opposite to the side of the current collecting portion. Characteristic conductor roll. 3. The collector portion side according to claim 1, wherein the boss portion on the collector portion side is made of stainless steel, and the boss portion on the side opposite to the collector portion side is made of steel, for example. A conductor roll characterized in that the material of the boss portion is selected so that the electric resistance of the boss portion is larger than the electric resistance of the boss portion on the side opposite to the current collecting portion side. 4. The material for a part or all of the shaft portions between the boss portions according to claim 1, so that at least the boss portions of the shaft portions have low electrical resistance. And / or a material having a low electric resistance is attached to the surface of the shaft portion between the boss portions, and / or the diameter of the shaft portion between the boss portions is increased. 5. A strip electroplating apparatus, comprising: the conductor roll according to claim 1; and an anode having a bus bar only on the current collector side.