JP3011374B2 - Edge mask positioning control system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an edge mask positioning control system for performing uniform electroplating on a continuously moving steel strip.

[Conventional technology]

In the case of electroplating a strip-shaped steel strip, conventionally, two parallel electrode plates are provided in an electrolytic bath filled with an electrolytic solution, and the steel strip is passed between the parallel electrode plates. This has been done by making the state between the plate and the plate conductive. However, when plating is performed while simply passing the steel strip between the two parallel electrodes, the current density at both ends of the steel strip, that is, the edge portion becomes larger than that near the center of the steel strip. As a result, the plating thickness near the edge became large, and the plating thickness of the entire steel strip could not be made uniform.

Therefore, conventionally, both sides of the steel strip are covered with a U-shaped edge mask made of an insulator, and the current density at the edge is controlled to be substantially equal to the current density near the center of the steel strip. Was. At this time, by keeping the relative positional relationship between the edge mask and the steel strip constant, the steel strip is electroplated with a constant thickness.

On the other hand, the length of the electrolytic bath used for plating is several tens of meters, so that the steel strip moving inside the electrolytic bath may meander from the entrance to the exit of the electrolytic bath, In the welded part, a part having a defective portion such as a change in plate width, a bend, a notch or the like moves in the electrolytic cell. In such a case, in order to keep the relative positional relationship between the edge mask and the steel strip in the electrolytic cell constant, conventionally, the edge position of the steel strip is detected on the entrance side and the exit side of the electrolytic cell. A sensor was provided or a sensor for detecting the width of the steel strip was provided.

Such prior arts are described in Japanese Patent Publication No. Sho 62-37702 and Japanese Patent Laid-Open Publication No. Sho 63-247394.

[Problems to be solved by the invention]

As shown in FIGS. 10 (a) and 10 (b), a sensor 51 for detecting the edge position of a steel strip 54 is provided at the inlet IN and the outlet OUT of the electrolytic cell 50 as shown in FIGS. And 52, the edge of the steel strip 54 moving in the electrolytic cell 50 is detected, the meandering amount of the steel strip 54 is assumed according to the detection result, and the edge mask 56 is determined according to the meandering amount. And 57 are controlled. Further, by providing a sensor 53 for detecting the width of the steel strip in the preceding stage of the inlet side IN of the electrolytic bath 50, the width of the steel strip flowing into the electrolytic bath 50 is detected, and according to the width of the steel strip. The position of the edge mask is controlled.

However, as shown in the figure, when a steel strip having a narrow steel strip 54 and a wide steel strip 55 welded to each other passes through the electrolytic cell 50, as shown in FIG. When only the narrow steel strip 54 is present in the electrolytic cell 50, the edge masks 56 and 57 are located at positions corresponding to the width and meandering amount of the steel strip 54,
At the time when the steel strip 55 having a large width flows into the electrolytic cell 50 as shown in FIG.
57 must be simultaneously moved to a position corresponding to the width of the steel strip 55. Therefore, since the edge masks 56 and 57 do not effectively act on the steel strip 54 near the welding, poor plating is likely to occur.

In particular, most of the conventional electrolytic cells have a length of several tens of meters as shown in FIG. 10 or a plurality of electrolytic cells having a length of several tens of meters as shown in FIG. As shown in the figure, when steel strips with different widths pass through the electrolytic cell, the steel strip with the smaller width has poor plating over a length of several tens of meters corresponding to the length of the electrolytic cell. Become. Then, a portion where such plating failure occurs cannot be used as a plated steel strip, resulting in wasteful consumption of the steel strip.

The present invention has been made in view of the above-described point, and the relative width between the edge mask and the steel strip is changed even when the width of the steel strip changes suddenly or when the steel strip moves meandering. It is an object of the present invention to provide an edge mask positioning control system capable of keeping a target positional relationship constant and minimizing a portion where plating failure occurs.

[Means for solving the problem]

The edge mask positioning control system of the present invention is an electrolytic cell for performing electroplating, a steel strip that is to be electroplated by passing through the electrolytic cell, and covers both side edges of the steel strip. An edge mask for making the current density of the portion substantially equal to the current density near the center of the steel strip, a driving means for moving the edge mask, and a linear position detecting means for detecting the current position of the edge mask Edge position detecting means for detecting an edge position of the steel strip on the entrance side and exit side of the electrolytic cell, and contour detecting means for detecting a contour of the steel strip before flowing into the electrolytic cell. Moving position detecting means for detecting a moving position of the steel strip, the linear position detecting means, the edge position detecting means,
The meandering amount and the outer shape of the steel strip are calculated according to signals from the outer shape detecting means and the moving position detecting means, and the relative positional relationship between the edge mask and the steel strip in the electrolytic cell is determined. Positioning control means for controlling the driving means so as to be substantially constant and controlling the position of the edge mask.

[Action]

In order to perform uniform electroplating on the steel strip, it is necessary to make the current density at the edge of the steel strip substantially equal to the current density near the center of the steel strip. Then, the edge position of the steel strip on the entrance side and the exit side of the electrolytic cell is detected by the edge position detecting means. The positioning control means calculates the meandering amount of the steel strip in the electrolytic cell based on the edge position,
The position of the edge mask is controlled so that the relative positional relationship between the edge mask and the steel strip is substantially constant. At this time,
The moving position detecting means detects the moving position of the steel strip. The positioning control means can always grasp the position of the steel strip moving in the electrolytic cell based on the moving position.
Therefore, when the outer shape detecting means detects the outer shape change of the steel strip, the positioning control means can always grasp the moving position of the outer shape changing portion in the electrolytic cell. , The position of the edge mask can be controlled so that the relative positional relationship between the edge mask and the steel strip is substantially constant.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 (a) and 1 (b) are diagrams showing a schematic configuration of one embodiment of an edge mask positioning control system of the present invention including a plating line. FIG. 1 (a) is a side view thereof, and FIG. 1 (b) is a top view thereof.

In the plating line of this embodiment, the steel strip 10 is moved by the rotating roll 11 and the steering means 12 and 13. In this embodiment, an electrolytic cell 50 having a length of several tens of meters as shown in FIG. 10 is arranged between the steering means 12 and 13, but is not shown for convenience of explanation.

On the entry side of the electrolytic cell, entry-side detection means 20 for detecting the edge position of the steel strip 10 is provided, and on the exit side, an exit-side detection means 21 is provided. Entry side detection means 20 and exit side detection means 21 are CC
It is composed of a line sensor or the like in which light-receiving elements such as D are arranged in a straight line.
22a and 22b are provided on the upper side of the exit side detecting means 21 with the light emitting means 23a.
And 23b are provided respectively.

Therefore, the entrance side detection unit 20 and the exit side detection unit 21 detect the edge position of the steel strip 10 by receiving the light from the light emitting units 22a and 22b, 23a and 23b, and convert the edge position detection signal to the edge position. Output to the mask control means 30. The input side edge position signal EI is supplied from the input side detection means 20 to the output side detection means.
The outgoing edge position signal EO is output from 21.

The edge mask control means 30 outputs these edge position signals EI
The meandering amount of the steel strip 10 moving on the plating line in the electrolytic tank according to the EO and the EO is calculated, and each edge mask 14a, 1
Steel strip meandering at positions 4b, 15a, 15b, 16a and 16b
Positioning control is performed at a position that is relatively constant with respect to the ten edge positions.

In front of the steering mechanism 12, first and second contour detecting means 24 and 25 for detecting the width and contour of the steel strip 10 are provided.
Is provided. The first and second contour detecting means 24
And 25 have the same configuration as the entry-side detection means 20, and have light-emitting means 26a and 26b, 27a and 27b above. The contour detection signals of the first and second contour detecting means 24 and 25 are output to the edge mask control means 30.

The first and second contour detecting means 24 and 25 are 106.4 cm = 1.
It is arranged so as to have an interval of 3.3 cm × 8. This 13.
3 cm means that the moving speed of the steel strip 10 is 16000 cm / min and the maximum sampling period of the first and second outer shape detecting means 24 and 25 is
This is the amount of movement of the steel strip 10 that moves during the maximum sampling period of 50 ms when 50 ms is set. In this embodiment, the distance between the first and second outer shape detecting means 24 and 25 is determined by the amount of movement.
Eight times 13.3 cm. The first and second outer shape detecting means
Details of the method of calculating the outer shape of the steel strip 10 based on the detection signals from 24 and 25 will be described later.

The edge masks 14a and 14b are paired with the steel strip 10 interposed therebetween, and the hydraulic cylinder unit is connected via a cylinder rod.
It is connected to 17a and 17b. Edge masks 15a and 15
b, 16a and 16b are similarly configured. In the present embodiment, the case of three edge mask pairs will be described. However, actually, several dozen pairs are provided according to the length of the electrolytic cell. Then, each edge mask 14a and 14b, 15a and 15b, 16a and 1
6b is a hydraulic cylinder unit 17a and 17b, 18a and 18b, 19
The steel strip 10 is moved perpendicularly to the moving direction of the steel strip 10 by a and 19b, and the positioning is controlled to a position where the relative positional relationship is constant according to the width of the steel strip 10.

The hydraulic cylinder units 17a and 17b are edge masks 14a.
And 14b controls the linear position of the coupled cylinder rod by hydraulic pressure, and incorporates a linear position detecting device for absolutely detecting the linear position of the cylinder rod. The position data of the cylinder rods, that is, the edge masks 14a and 14b detected by the linear position detecting device are output to the edge mask control means 30, and the hydraulic cylinder units 17a and 17b are driven and controlled by control signals from the edge mask control means 30. . Hydraulic cylinder unit 18
a and 18b, 19a and 19b are similarly configured. The details of this linear position detecting device are described in Japanese Utility Model Laid-Open No. 59-23609, and the details of the hydraulic cylinder unit incorporating this linear position detecting device are described in Japanese Patent Application Laid-Open No. 59-117902.

In the present invention, the rotational position detecting means 28 is connected to the rotary roll 11 as a sensor for absolutely detecting the current position of the steel strip 10 in the moving direction. As the rotational position detecting means 28, for example, an inductive phase shift type position capable of absolutely detecting the rotational position over multiple rotations as disclosed in JP-A-57-70406 or JP-A-58-106691. Using a detection device, the detection output is output to the edge mask control device 30, and the digital steel strip
Converted to 10 position data.

The edge mask control means 30 includes edge position signals EI and EO from the entrance side detection detection means 20 and the exit side detection means 21, contour detection signals from the first and second contour detection devices 24 and 25, and rotational position detection means. The rotation position data from the controller 28 and the current position data from the linear position detecting device in each hydraulic cylinder unit are input, and the edge mask 14 is
A control signal for positioning a and 14b, 15a and 15b, 16a and 16b at the optimum edge position of the steel strip 10 is output to the hydraulic cylinder units 17a and 17b, 18a and 18b, 19a and 19b.

That is, in the present invention, the first and second outer shape detecting means are provided.
The width of the steel strip 10, that is, the outer shape is detected based on the outer shape detection signals from 25 and 25, and if a change in the outer shape (for example, a welded portion in FIG. 10) is detected, the position of the outer shape change portion is detected. Is stored in association with the rotation position data of the rotation position detection means 28, and the position of each edge mask is calculated while calculating where the outer shape change portion of the steel strip 10 moving in the electrolytic bath is located in the electrolytic bath. Positioning.

Therefore, even when the welded portion having a changed plate width flows into the electrolytic cell 50 as shown in FIG. 10 (b), it is not necessary to adjust the positions of all the edge masks to the wide plate width. The position of the edge mask can be sequentially adjusted to a position corresponding to a wide plate width in accordance with the position of the outer shape changing portion, and it is possible to greatly reduce defective plating portions on the steel strip.

FIG. 2 is a block diagram corresponding to the edge mask positioning control system of FIG. 1, and illustrates three hydraulic cylinder units 17a, 18a and 19a on one side on a plating line.

The edge mask control means 30 includes an outer shape calculation means 31, a sensor input interface 32, and an actuator position calculation means.
33, a first axis control means 34, a second axis control means 35, and a third axis control means 36. Although the same number of these axis control means as the number of the first edge masks are provided, only three corresponding to the hydraulic cylinder units are shown here.

The outer shape calculating means 31 includes first and second outer shape detecting means 24 and
The external shape detection signal from 25 and the rotational position data from the rotational position detecting means 28 are input, the external shape data of the steel strip 10 is calculated, and only when a change in the external shape is detected, the external shape data is input to the sensor input interface 32. Is output to the actuator position calculation means 33 via the.

The sensor input interface 32 includes external shape data of the external shape calculating means 31, rotational position data of the rotational position detecting means 28, an input side edge position signal EI of the input side detecting means 20, and an output side detecting means.
The outgoing edge position signals EO of 21 are input, and these signals are output to the actuator position calculating means 33.

The actuator position calculating means 33 outputs the external shape data, the rotational position data, the input side edge position signal EI and the output side edge position signal EO input through the sensor input interface 32.
Based on the steel strip 1 of each edge mask 14a, 15a and 16a
The relative position with respect to 0 is calculated, and the command position data is output to the first, second and third axis control means 34, 35 and 36 via the serial high-speed bus 37.

The first, second and third shaft control means 34, 35 and 36 are provided with cylinders 17e in each of the hydraulic cylinder units 17a, 18a and 19a,
A current command signal for driving 18e and 19e is output to servo amplifiers 17c, 18c and 19c, respectively.

The hydraulic cylinder unit 17a includes a servo amplifier 17c, a servo valve 17d, a hydraulic cylinder 17e, and a linear position detecting device 17f.
Consists of

The servo amplifier 17c receives the current command signal from the first axis control means 34, and supplies a corresponding valve driving current to the servo valve 17d.

The servo valve 17d controls the opening and closing amount of a valve for supplying hydraulic pressure to the hydraulic cylinder 17e according to the current supplied from the servo amplifier 17c.

The hydraulic cylinder 17e includes a cylinder rod, a cylinder, and oil immersion chambers provided on both sides thereof. The cylinder rod, that is, the edge mask 14b is linearly moved by variably controlling the oil pressure in the oil immersion chamber by the servo valve 17d.

The linear position detecting device 17f is provided adjacent to the oil immersion chamber,
The linear position of the cylinder rod, that is, the relative position of the edge mask 14b to the steel strip 10 is detected.

The hydraulic cylinder units 18a and 19a have the same configuration as the hydraulic cylinder unit 17a.

Next, referring to FIGS. 3, 4 (a) to (l) and FIG. 5, the outer shape calculating means shown in FIG. 2 for steel strips 10 having different widths as shown in FIG. 10 (b). The processing of 31 will be described.

FIG. 3 is a view showing the relative position, that is, the field of view, of the steel strip 10 viewed from the first and second outer shape detecting means 24 and 25. Each field of view is a square with addresses from 0 to B. (Hereinafter, the visual field at address 0 is referred to as visual field 0). Therefore, when the steel strip 10 moves from the left to the right, the field of view seen from the first and second contour detecting means 24 and 25 moves in the direction in which the address increases (from the right to the left).

As described above, the distance between the first and second outer shape detecting means 24 and 25 is 13.3 cm × 8 = 106.4 cm, and the moving speed of the steel strip 10 is 16000.
Since the sampling period is cm / min and the maximum sampling period is 50 ms, the first and second outer shape detecting means 24 and 25 detect the edge position of the steel strip 10 every 13.3 cm.

FIG. 3 shows that each field of view moves vertically to indicate the amount of meandering of the steel strip 10, but the position of the field of view is actually fixed. That is, between the visual field 0 and the visual field 1, the visual field 1 is shown as moving upward. The movement amount at this time is the meandering amount of the steel strip 10.
Therefore, considering the fixed view in the vertical direction, the steel strip 10
Meanders downward, resulting in a negative meandering amount. Therefore, the meandering amount between the visual field 1 and the visual field 3 is plus,
There is a negative meandering amount between the visual fields 3 and 9 and a positive meandering amount between the visual fields 9 and B.

FIG. 4 is a view showing the upper half of each of the visual fields 0 to B in FIG. 3, and FIG. 5 is a diagram showing a process of calculating the outer position of the steel strip 10 based on the detection results in FIG. FIG. 3 is a diagram illustrating a state of a memory in which data is stored.

In FIG. 4, the thin solid line indicates the actual shape of the steel strip in the field of view, and the thick solid line indicates the shape of the steel strip determined by the outer shape calculating means 31. The dotted line is a line simply connecting the right edge position and the left edge position in the field of view, and represents the actual inclination amount (actual inclination amount) grasped only from the contour detection signals of the first and second contour detecting means 24 and 25. ). The numbers on the left and right sides in each field of view indicate the right edge position and the left edge position.
The numbers with positive and negative signals near the center in each field of view indicate the values of the actual tilt amount indicated by the dotted lines. The number in the lower center in each field indicates the address. The bidirectional arrows in each field of view will be described later.

In FIG. 5, the address numbers 0 to B of each field of view are displayed in the “address” column, and the first address is displayed in the “first outer shape detecting means” column.
The edge position of the steel strip 10 detected by the outer shape detecting means 24 (the number on the left side in each field of view in FIG. 4) is indicated by the second outer shape detecting means 25 in the column of "second outer shape detecting means". Detected edge position of steel strip 10 (number on right side in each field of view in FIG. 4)
However, the column of “rotational position detecting means”
The rotational position data of the rotating roller 11 detected by the above is stored.

In the column of "actual inclination amount", a value obtained by subtracting the edge position of the first outer shape detecting means 24 from the edge position of the second outer shape detecting means 25 is stored. In FIGS. 4 (c) to (j), those indicated by dotted lines indicate the actual inclination amounts.

The column of "virtual tilt amount" stores the actual tilt amount when the actual tilt amount is the same as the actual tilt amount of the next address, and stores the virtual tilt amount of the previous address when the actual tilt amount is different. Therefore, the fifth
In the figure, the same value is stored as the actual tilt amount and the virtual tilt amount.

The second meandering means 25
The edge position of the virtual edge line drawn based on the virtual inclination amount at 13.3 cm behind the edge position (right end of the field of view), that is, the position that will come to the position of the second outer shape detecting means 25 at the next address The calculated value is stored. Specifically, it is the distance indicated by the bidirectional arrow in FIGS. 4 (a) to (l).

In the visual fields 0 and 1, only the narrow part of the plate width is within the visual field, so that the meandering amount detection position is the edge position of the first or second contour detection means as shown in FIGS. 4 (a) and 4 (b). Is the same as The same applies to the fields of view 10 and B (FIGS. 4 (k) and (l)).

In the visual fields 2 to 9, since the plate width change point exists in the visual field, the first external shape detecting means 24 and the second external shape detecting means 25
Are different from each other, the straight line connecting the edge positions of the first and second contour detecting means 24 and 25 is a virtual edge line, and the meandering amount detecting position is the second contour detection. It is a value smaller by 0.5 than the edge position of the means.

The “meandering amount” column stores the amount of meandering of the steel strip 10. This meandering amount is a value obtained by subtracting the edge position of the second outer shape detecting means 25 from the meandering amount detection position of the immediately preceding address. That is, the visual fields 0 and 1 (FIGS. 5A and 5B)
Since only the narrow portion of the steel strip 10 is detected, the edge position and the meandering amount detection position are both "11" in the field of view 0, and the edge position and the meandering amount detection position are both in the field of view 1. It is "13". Therefore, the meandering amount in the visual field 1 is 11−13 = −2. Hereinafter, the same applies to the visual fields 2 to B.

The column of “outer shape position” stores the actual outer shape position of the steel strip 10. The outer shape position is a value obtained by adding the total sum of the meandering amounts to the visual field to be obtained and the edge position of the second outer shape detecting means 25. In the case of FIG. 5, the outer position is calculated based on the outer position of the field of view 0. The sum of the meandering amounts in the field of view 1 is “−2”, and the second outer shape detecting means 25
Is "13", the outer shape position in the visual field 1 is the sum of the two, "-2 + 13 = 11". Similarly, since the total sum of the meandering amounts in the visual field 2 is “−2 + 5 = + 3” and the edge position of the second contour detecting means 25 is “8”, the contour position in the visual field 2 is “3 + 8 = 11”. It is.
Hereinafter, by performing the same calculation on each of the visual fields 3 to B,
The external position of each field of view can be calculated. However, since this external position is based on the external position of the visual field 0, a different value is obtained by changing the reference value.

The outer shape of the steel strip 10 is represented based on the outer shape position and the virtual inclination amount thus obtained. That is, at address 0, the outer shape position is "11", and a straight line having a tilt amount of 0 from that position to the next sampling position is the outer shape position. At the address 2, the outer shape position is “11”, and a straight line having a tilt amount of +4 is the outer shape position. These external positions are indicated by thick lines in FIGS. 4 (a) to 4 (l). Then, when the outline position indicated by the thick line is connected for each address, the steel strip 10 is recognized as the outline indicated by lines 37 and 38 in FIG.

Next, the operation of the outer shape calculating means 31 shown in FIG. 2 with respect to the steel strip 10 bent in a V-shape will be described with reference to FIGS. 6, 7 (a) to (l) and FIG.

FIG. 6 corresponds to FIG. 3, and is a view showing the relative position (field of view) of the steel strip 10 seen from the first and second outer shape detecting means 24 and 25.

FIG. 7 corresponds to FIG. 4 and shows the upper half of each of the visual fields 0 to B in FIG.

FIG. 8 corresponds to FIG. 5, and is a diagram showing a memory state in which data is stored in the process of calculating the outer shape position of the steel strip 10 based on the detection results of FIG. 8th
The values in each column of the figure were obtained in the same manner as described above.

In the case of FIG. 6, the value of the actual tilt amount gradually decreases from the visual field 1 to the visual field 9 as shown by the dotted line in FIG. 7, and differs from the actual tilt amount of the next address. The value of the virtual tilt amount from the previous address to the visual field 8 stores the virtual tilt amount “+8” of the previous address one after another, and the virtual tilt amount “−8” is stored in the visual fields 9 to 11.

When the outer shape of the steel strip 10 is represented based on the outer shape position and the virtual inclination amount thus determined, the outer shape position is exactly the same as the outer shape position in FIG.

As described above, the outer shape calculation means 31 can detect the outer shape of the steel strip even when the shape of the steel strip is complicated.

Actuator position calculation means 33, the position of each edge mask according to the outer shape data of the steel strip 10 detected by the outer shape calculation means 31 as the position command data, each axis control means 34,
Output to 35 and 36.

However, since the shape of the steel strip usually does not change much as shown in FIGS. 3 and 6, the actuator position calculating means 33 is controlled by the rotation position means 28, the entry side detection means 20 and the exit side detection means 21. The position of the edge mask is controlled so as to correct the meandering amount of the steel strip based on the detection signal.

When the contour calculating means 31 detects a significant change in the edge position of the steel strip as shown in FIGS. 3 and 6, it outputs the contour data to the actuator position calculating means 33. When inputting the external shape data from the external shape calculating unit 31, the actuator position calculating unit 33 controls the position of the edge mask based on the external shape data.

That is, the outer shape calculation means 31 and the actuator calculation 33 are processed by different microprocessors, and the actuator calculation means 33 controls the positioning of the edge mask in accordance with the event generation signal from the outer shape calculation means 31.

Next, a detailed configuration of each axis control means will be described with reference to FIG.

The actuator position calculator 33 is connected to the position controller 41 and outputs position command data F0 indicating the target position of the cylinder rod to the position controller 41. The actuator position calculating means 33 is provided with a serial communication interface 43.
And outputs various data D1.

The axis control unit 34 includes a position control unit 41, a speed control unit 42, a serial communication interface 43, and a position sensor conversion unit.
44 and a speed calculator 45.

The position controller 41 is connected to the actuator position calculator 33 and the position sensor converter 44, and inputs position command data F0 indicating a target position of the cylinder rod and position data P2 indicating a current position of the cylinder rod.

The position control unit 41 is connected to the speed control unit 42, obtains a deviation between the position command data F0 and the position data P2, and outputs a speed command signal F1 corresponding to the position deviation to the speed control unit 42.

The speed control unit 42 is connected to the position control unit 41, the speed calculation unit 45, and the serial communication interface 43, and inputs a speed command signal F1 from the position control unit 41 and a speed signal F2 indicating the current speed of the cylinder rod. . The speed signal F2 is obtained by converting the position data P of the position sensor
It is converted by The speed calculation unit 45 receives the position data P2 of the position sensor conversion unit 44 and calculates the moving speed of the cylinder rod by digital calculation based on the amount of change in the position data P2 per unit time.

The speed control unit 42 is connected to the serial communication interface 43, finds a deviation between the speed command signal F1 and the speed signal F2, and outputs a cylinder rod current command signal T1 corresponding to the speed deviation to the serial communication interface 43. .

The serial communication interface 43 is connected to the actuator position calculating unit 33 and the speed control unit 42, and receives various data D1 from the actuator position calculating unit 33 and the current command signal T1 from the speed control unit 42 via a communication line. Unit 17a serial communication interface 4
6 (not shown in the hydraulic cylinder unit of FIG. 2).

The serial communication interface 43 and the serial communication interface 46 are connected by a bidirectional communication line.
D1 and data D2 generated in the hydraulic cylinder unit 17a
Are exchanged between the actuator position calculating means 33 and the hydraulic cylinder unit 17a.

The hydraulic cylinder unit 17a includes a serial communication interface 46, a servo amplifier 17c, a servo valve 17d, a hydraulic cylinder 17e, and a linear position detecting device 17f.

The serial communication interface 46 is connected to the serial communication interface 43 of the axis control means 34 and the servo amplifier 17c, receives the current command signal T1 from the serial communication interface 43, and outputs the current command signal T2 to the servo amplifier 17c as a current command signal T2. Various data D2 such as a status signal indicating a control state in the servo amplifier 17c is transmitted to the serial communication interface 43.

Servo amplifier 17c has serial communication interface 46
Connected to the servo valve 17d and the current command signal T
2 is input, the power transistor is driven based on the input, and a drive current is supplied to the servo valve 17d.

A data line is connected between the serial communication interface 46 and the servo amplifier 17c, so that various data can be exchanged between the two.

The servo amplifier 17c has a function of detecting control states such as overload, power supply voltage drop, overcurrent, overvoltage and overheating of the hydraulic cylinder, a servo status signal indicating these control states, and a servo amplifier. It has a memory for storing various data such as an ID code indicating the rating of 17c and a cylinder rating code indicating the rating of the hydraulic cylinder to be controlled. The data stored in the memory in the servo amplifier 17c is transmitted as necessary to the actuator position calculating means 33 via the data line and the serial communication interfaces 46 and 13 as the data D2. The cylinder rating code is stored as a table in the memory. Accordingly, by selecting a table number corresponding to the rating of the hydraulic cylinder connected via the communication line, the servo amplifier 17c can control hydraulic cylinders having different ratings. Thus, even when the hydraulic cylinder is replaced, the hydraulic cylinder unit can be changed to a control system corresponding to the hydraulic cylinder simply by changing the table number.

 Next, the operation of this embodiment will be described.

First, when an edge mask positioning control system as shown in FIGS. 1, 2 and 9 is constructed, the data D1 of the table number indicating the rating of the hydraulic cylinder is transmitted from the actuator position calculating means 33 to the serial communication interface.
The data is transmitted to the serial communication interface 46 on the hydraulic cylinder unit 17a side via 43. The transmitted table number data is transmitted by the serial communication interface 46 to the servo amplifier 17c. Thus, the servo amplifier 17c specifies the rating of the hydraulic cylinder and functions as a servo amplifier according to the rating of the hydraulic cylinder.

The actuator position calculating means 33 includes the outer shape data of the steel strip obtained by the outer shape calculating means 31, the rotational position data of the rotational position detecting means 28, and the input side edge position signal of the input side detecting means 20.
EI and the output side edge position signal EO of the output side detection means 21 are input, and position command data F0 indicating the target position of each edge mask, that is, the cylinder rod, is output to the first axis control means 34. The position control unit 41 of the first axis control means 34 is a
A speed command signal F1 based on F0 and the position data P2 is output to the speed control unit. The speed control unit outputs a current command signal T1 corresponding to the speed command signal F1 and the speed signal F2 to the serial communication interface 43.

Transmission is performed between the serial communication interface 43 and the serial communication interface 46, and the current command signal T2 is output from the serial communication interface 46 to the servo amplifier 17c. The servo amplifier 17c controls the drive current of the servo valve 17d based on the current command signal T2. Linear position detector 17f coupled to hydraulic cylinder 17e
Is output to the axis control means. The positioning control system repeats the above operation to position the cylinder rod at the target position.

The same processing as above is performed for each hydraulic cylinder unit 17b, 18a,
This is also performed for 18b, 19a and 19b, and each edge mask 14
Positions of a, 14b, 15a, 15b, 16a, and 16b are controlled to predetermined positions with respect to the steel strip.

During this control, overload, power supply voltage drop,
When abnormalities such as overcurrent, overvoltage, and overheating occur, status signal data indicating the control status is transmitted from the servo amplifier 17c to the serial communication interface 4.
Sent to 6. The data of the status signal is transmitted to the actuator position calculating means 33 via the serial communication interface 43. Actuator position calculation means
33 receives the data of the status signal and performs processing according to the type of the status signal.

When changing the hydraulic cylinder to one with a different rating,
The servo amplifier 17c can perform the current control according to the changed hydraulic cylinder simply by transmitting the table number indicating the changed hydraulic cylinder rating to the servo amplifier 17c.

In the present embodiment, a new serial communication system which is constituted by simple hardware at a low cost and which can transmit data at high speed is employed. For details of the serial communication method, see Japanese Patent Application No. 2-49 filed earlier by the present applicant.
No. 640, the description is omitted.

In the above-described embodiment, the hydraulic cylinder has been described as an example of the driving means of the edge mask. However, the present invention is not limited to this, and it goes without saying that a servomotor or other driving means may be used. When a servo motor is used as the driving means, a driving force conversion means such as a ball screw is used to linearly move the edge mask, and the same rotation position sensor as the rotation position detection means 28 is used to detect the position of the servo motor. Good.

Further, in the above-described embodiment, the case where the outer shape detecting means and the input side detecting means are separately provided has been described. However, the outer shape detecting means 24 and 25 are provided at the position of the input side detecting means 20, and the outer shape detecting principal 25 is used for input. The side detection means may also be used.

The type of the electrolytic cell may be one having a length of several tens of meters as shown in FIG. 10 or one having a plurality of electrolytic cells arranged over several tens of meters.

〔The invention's effect〕

According to the present invention, the relative positional relationship between the steel strip and the edge mask can be kept constant even when the strip width of the steel strip rapidly changes, so that the occurrence of plating defects can be reduced, The waste of the strip can be eliminated.

[Brief description of the drawings]

FIG. 1 (a) is a side view showing an entire configuration of an embodiment of an edge mask positioning control system of the present invention including a plating line, FIG. 1 (b) is a top view of FIG. 1 (a), FIG. 2 is a block diagram showing the configuration of the edge mask positioning control system of FIG. 1 (a), and FIG. 3 is a relative position of steel strips having different widths as seen from the first and second contour detecting means. 4 (a) to 4 (l) are views showing the upper half of each field of view in FIG. 3, and FIG. 5 is detection of FIGS. 4 (a) to 4 (l). FIG. 6 is a view showing a memory state in which data in the process of calculating the outer shape positions of the steel strips having different widths based on the results is stored. FIG. 6 shows the bent steel strips visible from the first and second outer shape detecting means. 7 (a) to 7 (l) show the upper half of each field of view in FIG. FIG. 8 is a diagram showing a memory state in which data is stored in the process of calculating the outer shape position of the bent steel strip based on the detection results of FIGS. 7 (a) to (1), FIG. FIG. 10 is a view showing a detailed configuration of the axis control means of FIG. 2. FIG. 10 is a view showing a relative positional relationship of an edge mask to steel strips having different widths in a conventional plating line.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) C25D 7/06 C25D 17/10 C25D 21/12

Claims (2)

(57) [Claims] 1. An electrolytic cell for performing electroplating, a steel strip to be electroplated by passing through the electrolytic cell, and a steel sheet covering both side edges of the steel strip, and the current density of the edge part is changed by steel. An edge mask for making the current density substantially equal to the current density near the center of the strip plate; a driving unit for moving the edge mask; a linear position detecting unit for detecting a current position of the edge mask; Edge position detecting means for detecting an edge position of the steel strip on the entrance side and exit side; contour detecting means for detecting a contour of the steel strip before flowing into the electrolytic cell; and the steel strip. Moving position detecting means for detecting the moving position of the steel strip plate, according to signals from the linear position detecting means, the edge position detecting means, the outer shape detecting means and the moving position detecting means. Calculating a fine profile, and controls the drive means such that the relative positional relationship between the edge mask and the steel strip in the electrolytic tank is substantially constant,
And a positioning control means for controlling the position of the edge mask. 2. An outer shape which calculates outer shape data of the steel strip based on detection signals from the outer shape detecting means and the moving position detecting means and stores the data in association with the rotational position data. Calculating means, calculates the meandering amount of the steel strip in the electrolytic cell based on the detection signal from the edge position detecting means, and calculates the outer shape data, the rotational position data, and the meandering amount from the outer shape calculating means. Position calculating means for calculating position command data of the edge mask based on which the relative positional relationship between the edge mask and the steel strip in the electrolytic cell is substantially constant,
2. An edge mask according to claim 1, further comprising: axis control means for controlling said driving means based on said position command data from said position calculation means and current position data from said linear position detection means. Positioning control system.