JPH09279390A - Method and device for controlling pass position of continuous electroplating of steel strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for controlling a pass position in continuous electroplating of a steel strip capable of passing the steel strip in parallel with electrodes at the center of the electrodes and making the plating adhesions on the front and rear surface of the steel strip uniform and also provide a device therefor. SOLUTION: The distances between the steel strip and the electrodes are measured at the plural points on at least either of the electrode inlet and outlet sides of the steel strip and more preferably at the plural points in the transverse direction of the steel strip in continuous electroplating of the steel strip to execute an electrolytic treatment by supplying a plating liquid between the flat planar electrodes 2, 3 arranged in parallel across the steel strip 1. This method for controlling the pass position controls the plating liquid supplying flow rate ratios of the plating liquid flow passages F1 , F2 on the front surface side and rear surface side of the steel strip and further, preferably in the transverse direction of the steel strip in addition thereto in accordance with the results thereof. This device for controlling the pass position has nozzle headers divided in the transverse direction of the steel strip as the device for controlling the plating liquid supplying flow rate ratios.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and apparatus for controlling the strip running position in continuous electroplating of steel strip for obtaining excellent plating quality and stable operation in continuous electroplating of steel strip.

[0002]

2. Description of the Related Art In a method of performing continuous electroplating on a steel strip by supplying a plating solution between flat plate electrodes arranged in parallel with a steel strip sandwiched between the electrodes, the center between the electrodes is It is possible to pass the steel strip parallel to the surface so that the distance between the electrodes (hereinafter referred to as the distance between the electrodes) is shortened and the electric power consumption is reduced, and the front and back surfaces of the steel strip are plated. This is a very important issue for achieving uniform deposition amount.

To solve the above problems, a method of suppressing displacement of the steel strip in the direction of the gap by supplying a plating solution from a slit (static pressure pad) which generates a low pressure over a wide area between the electrode and the steel strip (commercially available) Toshiro Tada, “Advances in Electroplated Steel Sheet Manufacturing Technology”, Nishiyama Memorial Lecture 60-Japan Iron and Steel Institute) is known. Another method for improving plating quality and achieving stable operation by using a static pressure pad is disclosed in JP-A-59-9.
6293 publication is mentioned.

In this publication, static pressure slits are provided in the electrode plate in a divided manner in the width direction, a plating solution flow rate control valve is provided for each slit, and the pressure applied to the steel strip is adjusted to adjust the C warpage of the steel strip. Is being prevented. But these methods
Although it is possible to prevent the C warpage of the steel strip, there may be a difference in the distance between the electrodes on the front and back surfaces of the steel strip, and as a result, there may be a difference in the amount of plating deposited on the front and back surfaces of the steel strip. Had a problem that the device became complicated.

Further, these methods are effective when the strip running speed of the steel strip is slow, but when the strip running speed of the steel strip becomes high, for example, 400 mpm or more, the plating solution accompanying the steel strip is produced. The flow velocity increases, the pressure difference between the front and back of the steel strip increases,
In addition, the catenary of the steel strip and the wedge effect that occurs on the roll and the bite part of the steel strip become large, and there is a problem that the threading position becomes unstable.

That is, when the strip running speed is high, it is difficult to control the strip running position by an indirect method such as a static pressure pad, and it is more difficult to make the amount of plating adhered on the front and back of the steel strip uniform.

[0007]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of the prior art by passing a steel strip in the center between the electrodes parallel to the electrodes, and even when the strip running speed is high, the steel strip is It is possible to make uniform the amount of plating adhered on the front surface (front surface) and back surface of the
It is an object of the present invention to provide a method for controlling a strip passing position in continuous electroplating of steel strip and an apparatus therefor.

[0008]

A first aspect of the present invention is to provide a plating solution between a pair of flat plate-shaped electrodes which are arranged in parallel with a steel strip interposed therebetween, in continuous electroplating of a steel strip to be electrolytically treated.
On at least one of the electrode input side or output side of the steel strip of the electroplating tank, measure the distance between the steel strip and the electrode,
Based on the result, a method for controlling the strip passing position in continuous electroplating of a steel strip is characterized in that the ratio of the flow rates of the plating solutions supplied to the plating solution flow passages on the front surface side and the back surface side of the steel strip is controlled.

A second aspect of the present invention is the continuous electroplating of a steel strip to be electrolyzed by supplying a plating solution between a pair of flat plate electrodes arranged in parallel with the steel strip sandwiched therebetween. The distance between the steel strip and the electrode is measured at a plurality of positions in the strip width direction of the steel strip on at least one of the electrode entry side and the output side, and based on the results, the steel strip front side, back side, steel strip plate A method for controlling a plate passing position in continuous electroplating of a steel strip, characterized by controlling a ratio of a flow rate of a plating solution supplied to a plating solution channel in each width direction.

A third aspect of the present invention is an electroplating apparatus for continuous electroplating of a steel strip in which a plating solution is supplied between a pair of flat plate-shaped electrodes 2 and 3 which are arranged in parallel with each other with a steel strip 1 interposed therebetween, and which is subjected to electrolytic treatment. Position detection of a plurality of steel strips provided in the width direction of the steel strip, facing the plate surface of the steel strip 1 and at least on one side of the electrodes 2 and 3 of the steel strip 1 in the tank Sensors 6a, 6b,
6c, 6d, 7a, 7b, 7c, 7d and the steel strip front side and the back side of the plating solution flow path between the electrodes 2 and 3 are separately arranged independently and corresponding to the width direction of the steel strip. Plating solution supply devices 4 and 5 with variable plating solution flow rate and the position detection sensor
Based on the intervals between the steel strip 1 and the electrodes 2 and 3 at a plurality of positions in the width direction of the steel strip measured by 6a, 6b, 6c, 6d, 7a, 7b, 7c and 7d, the front and back sides of the steel strip. And a stripping position control device in continuous electroplating of a steel strip, which has a control device 30 for controlling a plating liquid supply flow rate ratio of the plating liquid supply devices 4 and 5 in the width direction of the steel strip. .

A fourth aspect of the present invention is an electroplating apparatus for continuous electroplating of a steel strip in which a plating solution is supplied between a pair of flat plate-shaped electrodes 2 and 3 which are arranged in parallel with each other with a steel strip 1 interposed therebetween to perform an electrolytic treatment. At least one of the electrodes 2, 3 inlet side and outlet side of the steel strip 1 of the tank is provided opposite to the surface of the steel strip 1 and at the center and both sides in the width direction of the steel strip. At least 6 steel strip position detection sensors 6a, 6b, 6c, 6d, 6e, 6f
And a plating solution supply nozzle header that is separately and independently arranged on the front surface side and the back surface side of the steel strip 1 of the plating solution flow path between the electrodes 2 and 3, and is divided into three or more parts in the width direction of the steel strip plate. 4 _L , 4 _C , 4 _R , 5 _L , 5 _C , 5 _R and steel strips at least 6 positions in the width direction of the steel strip measured by the position detection sensors 6a, 6b, 6c, 6d, 6e, 6f 1 and the electrodes 2 and 3 respectively, the plating solution supply nozzle headers 4 _L , 4 _C , 4 _R , 5 _L , 5 on the front and back sides of the steel strip 1 and in the width direction of the steel strip. _A plate passing position control device in continuous electroplating of a steel strip, which has a control device 30 for controlling a plating solution supply flow rate ratio of _C 5 _R.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. INDUSTRIAL APPLICABILITY The present invention relates to continuous electroplating of steel strips such as electrotin-based plating, electrozinc-based plating, electrochromic-based plating, etc., particularly continuous electrotin-based plating of steel strips, plate passing position control method and strip in continuous electrochromic plating. It is preferably used as a position control device.

An insoluble anode is preferably used as the electrode in this case. In the method of performing electroplating by supplying a plating solution between a pair of flat plate electrodes arranged in parallel with a steel strip sandwiched between them, the supply flow rate of the plating solution is sufficient to fill the electrodes without creating voids between them. Is essential. Therefore, the required supply amount of the plating solution increases as the strip running speed of the steel strip increases.

According to the present invention, after detecting the strip passing position of the steel strip between the electrodes by the sensor, while satisfying the above required supply amount, the steel strip front / back and width direction can be adjusted depending on the strip passing position. By performing feedback control of the distribution ratio of the plating solution supply amount, it became possible to sufficiently fill the plating solution between the electrodes and pass the steel strip in the center between the electrodes parallel to the electrodes.

An example of a continuous electroplating apparatus for steel strips according to the present invention is shown in FIG. 1 with a side view (a) and a plan view (b). Also, the steel strip surface on the steel strip entry side (front surface) of FIG.
The plating solution supply nozzle header provided on the [upper surface of the steel strip] side is shown in a perspective view in FIG. 2. In the following description, the upper surface of the steel strip 1 is referred to as a steel strip surface (front surface) and the lower surface of the steel strip 1 is referred to as a steel strip back surface in FIG. 1.

In FIGS. 1 and 2, 1 is a steel strip, 2 is an electrode on the front side of the strip, 3 is an electrode on the back side of the strip, 4 is a plating solution supply nozzle header on the front side of the strip, and 5 is a strip. Plating solution supply nozzle header on the back side, 6, 6a, 6b, 6c, 6d are position detection sensors for the steel strip on the front side of the strip, 7, 7a, 7b, 7c, 7d are position detection for the strip on the back side of the strip Sensor, 8, 8a, 8b, 8c, 8d, 8e,
8f, 8g, and 8h are flow rate control valves of the plating solution supply nozzle headers 4 and 5, 9 is an electroplating tank, 10 is a steel strip passage direction, 30 is a control device, d ₁ is an electrode 2 and steel on the steel strip surface side The distance from the strip 1, d ₂ is the spacing between the electrode 3 on the back side of the steel strip and the steel strip 1, F ₁ and F ₂ are the plating solution channels, and f ₁ and f ₂ are the supplied plating solution.

The plating solution supply nozzle headers 4 and 5 provided in the strip width direction of the steel strip 1 are divided in the strip width direction so that the flow rate of the plating solution can be varied in the strip width direction. Plating solution supply nozzle header 4L, 4C ₁ , 4C ₂ , 4R,
It is composed of 5L, 5C ₁ , 5C ₂ and 5R. In the following description, the distance between the steel strip plate surface and the electrode facing the steel strip plate surface (d ₁ , d ₂ ), that is, the distance between the steel strip and the electrode is Described as distance.

Electrolytic treatment is performed while supplying the plating solution from the plating solution supply nozzle headers 4 and 5 to the plating solution channels F ₁ and F ₂ between the pair of electrodes 2 and 3 arranged in parallel with the steel strip 1 interposed therebetween. By doing so, metals such as Sn, Ni, Cr, and Zn are electroplated on the front and back surfaces of the steel strip. In the present invention, at least one of the electrode input side or the output side of the steel strip of the electroplating tank, by the position detection sensor of the steel strip arranged facing the steel strip plate surface, between the steel strip and the electrode. Measure the distance.

FIG. 1 shows position detection sensors 6a, 6b, 6c, 6d, 7a, 7b of eight steel strips fixedly installed on the steel strip front side and the steel strip rear side of the strip. , 7c, 7d are used to measure the steel strip / electrode distances d ₁ , d ₂ . Incidentally, as the position detection sensor of the steel strip used in the present invention, a submerged propagation type ultrasonic range finder in which a transducer is fixedly arranged in the plating solution, a rigid body in which ultrasonic waves are immersed in the solution An ultrasonic range finder such as an ultrasonic range finder for propagating is preferably used, but the method is not limited thereto.

Next, the measurement result obtained above is used as a control device.
After performing computer processing with a 30 (personal computer etc.), the plating solution supply nozzle headers 4L, 4C ₁ , 4C ₂ , 4R, 5L, 5C ₁ , 5C ₂ , 5R in the interelectrode plating solution flow paths F ₁ , F ₂ Calculate the appropriate distribution of plating solution supply flow rate (plating solution supply flow rate ratio). The appropriate plating solution supply flow rate ratio can be determined in advance based on the relationship between the plating solution supply flow rate and the position of the steel strip electrodes, such as the amount of flow rate change obtained by line experiments and the displacement between electrodes of the steel strip. Is.

According to the obtained calculation result, each plating solution supply nozzle header 4L, 4C ₁ , 4C ₂ , 4R, 5L, 5C ₁ , 5C ₂ ,
Flow rate control valve 8 (8a-
Each opening of 8h) is adjusted by the signal output from the control device 30 to control the strip passing position of the steel strip 1 so that d ₁ = d ₂ both between the electrodes and in the width direction of the strip. To The supply rate Q ₁ of the plating solution supplied from the plating solution supply nozzle header 4 on the front side of the steel strip and the supply rate Q ₂ of the plating solution supplied from the plating solution supply nozzle header 5 on the back side of the steel strip.
As shown in FIG. 3, there is a lower limit of the total amount of the plating solution, that is, the total supply amount Q ₁ + Q ₂ of the plating solution, depending on the plate passing speed.

The lower limit of the total supply (Q ₁ + Q ₂ ) of the plating solution shown in FIG. 3 is Q _min , that is, the required supply rate of the plating solution depends on the width of the steel strip, the electrode length, the electrode width, and the distance between the electrodes. Receive a large In the present invention, the total plating solution supply amount Q ₁ + Q ₂ is
The lower limit value Q _min or more, the lower limit value is the steel strip width,
The factors such as the electrode length can be determined by an operation experiment or the like in which the numerical level is changed, and the result is stored in the control device 30 in advance.

According to the present invention, by using the above-described plate passing position control method, the plated surface is not scratched by the contact with the electrode even when the steel strip is passed at high speed, and as a result, the electrodes 2 and 3 are formed. Distance (hereinafter referred to as inter-pole distance) (d ₁ + d ₂ )
It was possible to reduce the amount of electricity used and the amount of power used, and even when the strip running speed of the strip was high, it was possible to achieve a uniform coating amount on the front and back of the strip and in the width direction.

From the principle, the present invention can correct not only the center displacement between the electrodes of the steel strip and the C warp, but also the inclination of the steel strip in the plate width direction.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on embodiments. In the following Reference Examples and Examples, the evaluation was made using the index Δt (%) obtained by the following formula (1) as an evaluation index for the uniformity of the coating adhesion amount. Δt = [(| t ₁ −t ₀ | + | t ₂ −t ₀ |) / t ₀ ] × 100 (%) (1) where t ₁ : average plating in the width direction of the steel strip surface Adhesion amount,
t ₂ : Average coating weight in the width direction of the steel strip back plate, t ₀ : Average coating weight in the width direction of the steel strip front / back surface [= (t ₁ + t ₂ ) /
2].

(Reference Example) Continuous electroplating of steel strip was performed using the electroplating apparatus shown in FIG. In FIG.
Reference numeral 20 indicates a deflector roll installed on the downstream side in the traveling direction of the steel strip, and other reference numerals indicate the same contents as in FIG. In addition, an insoluble anode was used as the electrode, and the distance between electrodes (d ₁ + d ₂ )
Was 40 mm.

As a result of using this electroplating apparatus, the wedge effect in the deflector roll 20 exerts a downward force on the steel strip as the strip running speed increases, and as a result, as shown in FIG. As the speed increased, the ratio of the plating solution supply flow rate Q ₁ on the steel strip surface side increased. Therefore, when the strip running speed is 600 mpm, the tin deposition amount on the steel strip surface is 0.91 g / m ² against the target tin deposition amount of 1.00 g / m ² .
m ² , the amount of tin deposited on the back side was 1.12 g / m ² , and Δ
There was a difference in the coating weight of t = 20%.

(Example 1) Continuous electrotin plating of a steel strip was performed using the electroplating apparatus shown in FIGS. 6 and 7. 6 (a) and 6 (b) are a side view and a plan view, respectively, and FIG. 7 is a steel strip surface (front surface) [steel strip upper surface] side of the steel strip entry side of FIG. 3 is a perspective view showing a plating solution supply nozzle header provided in FIG.

6 and 7, 4, 4L, 4C, 4R
Is a plating solution supply nozzle header arranged on the steel strip surface side,
5, 5L, 5C, 5R are plating solution supply nozzle headers arranged on the backside of the steel strip, and 6, 6a, 6b, 6c, 6d, 6e, 6f are the steel strip 1 electrode input side and output side steel strip surface. The position detection sensor of the steel strip fixedly installed on the side, 7, 7a, 7b, 7c, 7d, 7e, and 7f are the strips of the steel strip fixedly installed on the back side of the steel strip 1 on the electrode input side and the output side. The position detection sensor is shown, and other symbols are shown in FIGS. 1, 2 and 4.
Shows the same contents as.

In the electroplating bath shown in FIG. 6, three electrodes are provided in the width direction of the steel strip so as to face the steel strip plate surface on the steel strip entrance side and the steel strip exit side of the electrode 2 on the steel strip surface side. The steel strip position detection sensors 6a, 6b, 6c, 6d, 6e, 6f are provided, and the steel strip entrance side and the exit side of the electrode 3 on the back side of the steel strip face the steel strip plate surface to face each other. Three position detection sensors 7a, 7b, 7c, 7d, 7e, 7f for steel strips are provided in the width direction of the strip.

As the position detecting sensor for the steel strip, an ultrasonic submersible ultrasonic range finder in which a wave transmitter / receiver was fixedly arranged in the plating solution was used. Further, similarly to FIG. 1, the steel strip inlets of the electrode 2 on the front surface side of the steel strip and the steel strip inlet portions of the electrode 3 on the back surface side of the steel strip in the plating solution flow passages F ₁ and F ₂ are respectively provided with steel strips. 1
Nozzle headers 4 and 5 for supplying the plating solution were provided in the plate width direction.

Each of the plating solution supply nozzle headers 4 and 5 is divided into three parts in the width direction of the steel strip, and the divided nozzle headers 4L, 4C, 4R, 5L, 5C and 5R are each provided with a flow rate control valve 8 (8a ... 8f) is attached, and it is possible to control the distribution rate of the plating solution supply flow rate on the steel strip front side, the steel strip back side, and the strip width direction. Next, FIG. 8 shows a control method.

In FIG. 8, d _1L , d _1C and d _1R are the distances between the left end, the center and the right end of the steel strip surface (upper surface) and the electrode 2, that is, the steel strip surface (upper surface). Side shows the distance between the steel strip and the electrode in the width direction of the steel strip, and d _2L ,
d _2C and d _2R are the distances between the left and right ends of the steel strip back surface (lower surface), the center, and the right end, respectively, that is, the steel strip back surface (lower surface) side steel strip in the width direction.・ Indicates the distance between electrodes.

In this embodiment, the distance between the steel strip and the electrode is measured by the above-mentioned steel strip position detecting sensors 6a to 6f, and d _2L , d _2C and d _2R are the detector and the electrode, respectively. Obtained from the position in the height direction and d _1L , d _1C , d _1R , d _1L ,
For d _1C , d _1R , d _2L , d _2C and d _{2 R} , the average values of the steel strip on the electrode input side and the electrode side were used, respectively. From the above measurement results, it was found that the steel strip before the passage position control was in the state shown in the left column of FIG.

Therefore, the control device 30 performs the control shown in the right column of FIG. That is, in order to correct the C warp and correct the distance between the steel strip and the electrode (center displacement correction), the steel strip / electrode in the strip width direction on the steel strip surface measured by the steel strip position detection sensors 6a to 6f. It corresponds to the distances d _1L , d _1C , d _1R and the steel strip-electrode distances d _2L , d _2C , d _{2R in} the strip width direction of the steel strip on the back side obtained from the above-mentioned method from these values. Then, the following control was performed.

C Warp straightening control: plating solution supply header 5
The flow rates Q _2L , Q _1C and Q _2R of L, 4C and 5R were decreased, and the flow rates Q _1L , Q _2C and Q _1R of the plating solution supply headers 4L, 5C and 4R were increased. Center displacement correction control: Increase the flow rate Q _2L , Q _2C , Q _2R of the plating solution supply nozzle headers 5L, 5C, 5R on the back side of the steel strip to increase the plating solution supply nozzle headers 4L, 4C, 4R on the front side of the steel strip. The flow rates Q _1L , Q _1C and Q _1R have been reduced.

Total supply amount control: In addition to the control of,
The total amount of the supply rate Q ₁ of the plating solution supplied from the plating solution supply nozzle header 4 on the front side of the steel strip and the supply rate Q ₂ of the plating solution supplied from the plating solution supply nozzle header 5 on the back side of the steel strip, that is, The total supply amount Q ₁ + Q ₂ of the plating solution was set to the lower limit value Q _min or more of the total supply amount of the plating solution described above. In this test, the distance between the electrodes (d ₁ + d ₂ ) was 40 mm, and the strip running speed was 600 mpm.

As a result of performing the plate passing position control described above, the tin deposition amount of the tin-plated steel strip obtained is the target tin deposition amount of 1.
Against 200 g / m ^2, tin coating weight of 1.00 g / m ² of the steel strip surface, the back surface of the tin coating weight of 1.02 g / m ^2, i.e. the evaluation index Δt 2
%, The coating amounts on the front surface and the back surface were almost equal, and no distribution of the coating amount in the plate width direction was observed. (Example 2) In Example 1, the distance between the electrodes (d ₁ + d ₂ ) is
30 mm, the distance between the steel strip and the electrode is measured by the steel strip position detection sensors 6a, 6b, 6c, 7a, 7b, 7c shown in FIG. 6, except that the sensor is connected to the control device 30 and controlled. In the same manner as in Example 1, the strip passing position was controlled and the steel strip was continuously electroplated with tin.

As a result, no damage was found on the plating surface due to the contact between the steel strip and the electrode, and the distance between the electrodes was 3/4 that of the conventional one.
It has been found that the control method and apparatus of the present invention are also effective in reducing the amount of power used during plating, that is, energy saving.

[0040]

EFFECTS OF THE INVENTION According to the present invention, the uniformity of the amount of plating deposited on the front and back surfaces of a steel strip at a strip running speed of 400 mpm or more can be improved by 90%, and the distance between contacts can be shortened to 3/4 that of the conventional method. , The power consumption was reduced.

[Brief description of drawings]

1 is a side view (a) and a plan view (b) showing an example of a steel strip continuous electroplating apparatus according to the present invention.

FIG. 2 is a perspective view showing an example of a plating solution supply nozzle header of a steel strip continuous electroplating apparatus according to the present invention.

FIG. 3 is a graph showing the relationship between the lower limit of the total supply amount of plating solution and the plate passing speed.

FIG. 4 is a side view showing a conventional electroplating apparatus.

FIG. 5 is a graph showing the relationship between the flow rate of the plating solution on the front surface side and the back surface side of the steel strip and the strip running speed.

FIG. 6 is a side view (a) and a plan view (b) showing an example of a steel strip continuous electroplating apparatus according to the present invention.

FIG. 7 is a perspective view showing an example of a plating solution supply nozzle header of a continuous electroplating apparatus for steel strips according to the present invention.

FIG. 8 is an explanatory diagram showing an example of a plate passing position control system of the present invention.

[Explanation of symbols] 1 steel strip 2 electrode 3 electrode 4, 4L, 4C, 4C ₁ , 4C ₂ , 4R plating solution supply nozzle header 5, 5L, 5C, 5C ₁ , 5C ₂ , 5R plating solution supply nozzle header 6, 6a, 6b, 6c, 6d, 6e, 6f Steel strip position detection sensor 7, 7a, 7b, 7c, 7d, 7e, 7f Steel strip position detection sensor 8, 8a-8h Flow control valve 9 Electroplating tank 10 Steel Strip passing direction 20 Deflector roll 30 Controller d ₁ Steel strip front side steel strip-electrode distance d ₂ Steel strip back side steel strip-electrode distance d _1L , d _1C , d _1R Steel strip front plate Steel strip-electrode distance in the width direction d _2L , d _2C , d _2R Steel strip on the back side of the steel strip Steel strip-electrode distance in the width direction F ₁ , F ₂ Plating solution flow path

Claims (4)

[Claims] 1. Continuous electroplating of a steel strip to be electrolyzed by supplying a plating solution between a pair of flat plate-shaped electrodes arranged in parallel with a steel strip sandwiched between the electrodes of the steel strip in the electroplating tank On at least one side of the outlet side, the distance between the steel strip and the electrode is measured, and based on the result, the steel strip surface side,
A method for controlling a strip passing position in continuous electroplating of a steel strip, characterized in that a flow rate of a plating solution supplied to a plating solution flow passage on a back surface side is controlled. 2. In continuous electroplating of a steel strip to be electrolyzed by supplying a plating solution between a pair of flat plate-shaped electrodes arranged in parallel with a steel strip sandwiched between them, the electrode entrance side of the steel strip in an electroplating tank or On at least one side of the outlet side, the intervals between the steel strip and the electrodes at multiple locations in the strip width direction of the steel strip are measured, and based on the results, the steel strip front side, the back side, and the strip width direction, respectively. A method for controlling a strip passing position in continuous electroplating of a steel strip, characterized in that a flow rate ratio of a plating solution supplied to a plating solution flow path is controlled. 3. An electroplating apparatus for continuous electroplating of a steel strip, wherein a plating solution is supplied between a pair of flat plate-shaped electrodes (2, 3) arranged in parallel with the steel strip (1) sandwiched between the electrodes. At least one side of the electrode (2, 3) of the steel strip (1) in the tank is provided on both sides of the steel strip (1) plate opposite to the steel strip (1) plate surface and in the width direction of the steel strip plate. Position sensor for steel strip (6a, 6b, 6c, 6d, 7
a, 7b, 7c, 7d) and the plating solution flow path between the electrodes (2,3) are separately and independently arranged on the front and back sides of the steel strip in the plating solution flow path, and plating is performed in the width direction of the steel strip. The plating liquid supply device (4,5) with variable liquid flow rate and the position detection sensors (6a, 6b, 6c,
6d, 7a, 7b, 7c, 7d), based on the distance between the steel strip (1) and the electrodes (2,3) at multiple locations in the width direction of the steel strip measured by Plate passing position control in continuous electroplating of steel strip characterized by having a control device (30) for controlling the plating liquid supply flow rate ratio of the plating liquid supply device (4,5) in each of the width direction of the steel strip. apparatus. 4. A pair of steel strips (1) arranged in parallel with each other.
Supply the plating solution between the flat plate electrodes (2, 3) and perform electrolytic treatment.
In the continuous electroplating equipment for stainless steel strip,
Electrode (2,3) of steel strip (1) At least one of input side and output side
On the side of the steel strip (1) facing the strip surface and in the width direction of the strip.
At least 6 on the center and on each side
Steel strip position detection sensors (6a, 6b, 6c, 6d, 6e, 6f) and electrodes
Steel strip of plating solution flow path between (2, 3) (1) Front side and back side
Are arranged independently of each other and in the width direction of the steel strip.
Nozzle header for plating solution supply divided into three or more parts (4
_L,Four_C,Four_R,Five_L,Five_C,Five_R) And the position detection sensor (6a,
6b, 6c, 6d, 6e, 6f)
Steel strip (1) and electrode (2,3) at 6 locations at least
Steel strip (1) front side, back side, steel strip width
Nozzle head for supplying the plating solution in each direction
Da (4_L,Four_C,Four_R,Five_L,Five_C,Five_R) Of the plating solution supply flow rate
Of steel strip characterized by having a controlling device (30) for controlling
Plate passing position control device for continuous electroplating.