JPH05271987A - Method for controlling edge mask for steel strip of electrolytic treatment equipment - Google Patents

Abstract

PURPOSE:To prevent the trouble by the contact of edge masks and a steel strip by mounting a detector at the front end of the edge masks constituted at both ends in the transverse direction of the steel strip, detecting the meandering, etc., of the steel strip and releasing the edge mask at the time of continuously and electrolytically treating the long-sized steel strip in a treating liquid. CONSTITUTION:The steel strip 3 is passed between upper and lower anodes 1 and 2 in a container contg. the plating liquid and is energized as a cathode, by which the surfaces of the steel strip are electroplated. The edge masks 6, 6a actuated by driving devices 5, 5a are provided at both ends in the transverse direction of the steel strip 3 in order to prevent the formation of the plating layers to nonuniform thicknesses by the flow of overcurrents to both ends in the transverse direction of the steel strip 3 in such a case. The photoelectric type detector consisting of light projectors 7, 7a and light receivers 8, 8a is provided at the front ends thereof. The signal is sent to a detection controller when the steel strip 3 shields the light 9 from the light projector 7 by meandering, etc., and the end thereof is detected. The edge mask 8 is then released from the steel strip 3 by the driving device 5, by which the contact with the steel strip 3 is prevented. The failure of the edge masks 6, 6a and the flawing of the steel strip 3 are thus prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling a steel strip edge mask used in an electrolytic treatment process.

[0002]

2. Description of the Related Art When an electrode and a steel strip are made to face each other and are passed through a plate, and a treatment liquid is filled between the electrodes for electrolytic treatment, both ends (edge portions) in the width direction of the steel strip are placed at the center. In comparison, since an excess current easily flows, the amount of deposits of the electrodeposited material due to the electrolytic treatment varies in the width direction, which is not preferable in terms of quality. For this reason, it is known that edge masks are positioned at both ends of the steel strip so that excess current does not flow to both ends of the steel strip in the widthwise central portion and uniform electrodeposition is performed in the steel strip widthwise direction. .. However, in such an edge mask, there is a drawback that the steel strip and the edge mask come into contact with each other due to the meandering of the steel strip, the edge mask is damaged, and the steel strip is flawed. It is accompanied. Also, the actual exploitation 64-45
In Japanese Patent No. 166, it is supposed that a magnetic detector installed at the tip of such an edge mask detects the end of the steel strip to avoid contact with the edge mask. However, in such a device configuration, a magnetic field associated with energization (electrolytic treatment) is generated around the steel strip itself, the energizing roll, the electrode, etc. close to the magnetic detector, and the magnetic detector is affected by the magnetic field, Particularly, there is a drawback that malfunction is likely to occur when performing high-current electrolytic treatment. The present invention has been made to advantageously solve these drawbacks.

[0003]

The feature of the present invention resides in that a photoelectric sensor for detecting the end of the steel strip is provided at the tip of the edge mask, and a sharp meander of the steel strip occurs to cause the tip of the edge mask to move. When the installed detector detects the end of the steel strip, the edge mask is controlled to open immediately,
The method is for controlling an edge mask for a steel strip in an electrolytic treatment facility.

[0004]

That is, in the present invention, as described above, the photoelectric detector is provided so that the end of the steel strip can be detected without being affected by the magnetic field in the vicinity of the installation position. If there is a risk of contact when approaching,
The detection result of the end of the steel strip is fed back to the position control circuit of the edge mask to open the edge mask and prevent contact with the steel strip. The edge of the steel strip is detected by arranging photoelectric detectors including a light projecting portion and a light receiving portion above and below the edge mask. That is, the light continuously emitted from the light projecting portion to the light receiving portion is shielded by the steel strip end portion to detect the position of the steel strip end portion. The photoelectric detector is appropriately selected depending on the distance between the light projecting unit and the light receiving unit, which is restricted by other facility restrictions, the light transmittance of the processing liquid to be used, and other properties. That is, if both detectors withstand the use environment and the light emitted from the light emitting unit can be received by the light receiving unit while the processing liquid used between the light emitting unit and the light receiving unit is full, the present invention Can be used as a detector for.

[0005]

EXAMPLES Next, examples of use of the present invention in horizontal electroplating equipment will be described. As shown in FIGS. 1 and 2, a steel strip 3 is passed between the upper electrode 1 and the lower electrode 2, and the steel strip 3 is electrically charged through the energizing rolls 4 and 4a.
While filling the plating solution between them, the steel strip 3 is used as a cathode, electrodes 1, 2.
When the steel strip 3 is plated with electricity as an anode, in order to make the adhered amount of the steel strip 3 uniform in the width direction, as shown in the figure,
Drive devices (fluid pressure cylinders, etc.) 5 and 5 at both ends of the steel strip 3
The edge masks 6 and 6a are positioned via a. A photoelectric detector including a light projector 7, 7a and a light receiver 8, 8a is provided at the tip of the edge mask 6, 6a, and light 9 is emitted from the light projector 7 as shown in FIG. The edge masks 6 and 6 a are released from the steel strip 3 when the ends are detected by the light 9 being blocked by the meandering of the steel strip 3 or the like. An example of the opening sequence will be described with reference to FIG. The fluid pressure cylinder 5 is operated via the solenoid valve controller 12 via 11 to release the edge mask 6 from the steel strip 3.

FIG. 5 shows an example of edge mask position control in an electroplating line, and for the purpose of the accuracy of the present invention, the edge mask is approximately 50 m away from the edge mask in the traveling direction of the steel strip.
A plate width detector is installed in front of the detector, and the time-dependent changes in the edge position of the steel strip and the edge mask position detected by the detector are shown. That is, in the period A, the edge position of the steel strip detected by the strip width detector has a relatively small change, and in the period B, the edge position has a large change. This means that a severe meandering of the steel strip occurred in the period B, and it is expected that almost the same position change of the steel strip occurs near the edge mask. On the other hand, the edge mask position is the period A
In, the edge masks are located near both ends of the steel strip in order to prevent excess current from flowing to the ends of the steel strip.
In period B, when the steel strip suddenly meanders and the detector installed at the tip of the edge mask detects the edge of the steel strip, the edge mask is opened immediately to prevent contact between the steel strip and the edge mask. Controlled to do so. In this way, the photoelectric edge detector installed at the tip of the edge mask
By directly detecting the approach of the steel strip, the contact between the steel strip and the edge mask can be reliably prevented, and the edge of the steel strip using the edge mask can be prevented without causing damage to the edge mask or occurrence of flaws in the steel strip. It is possible to suppress the excess current.

[0007]

By doing so, it is possible to detect abnormally close contact between the steel strip and the edge mask, prevent damage to the edge mask, and prevent flaws in the steel strip. The effect is obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the present invention,

FIG. 2 is an explanatory view showing an embodiment of the present invention,

FIG. 3 is an explanatory diagram showing a detection principle of a photoelectric detector,

FIG. 4 is an explanatory diagram showing an edge mask opening sequence;

FIG. 5 is an explanatory diagram showing an example of the present invention.

[Explanation of symbols]

 1 upper electrode 2 lower electrode 3 steel strip 4, 4a energizing roll 5, 5a driving device (fluid pressure cylinder) 6, 6a edge mask 7, 7a light projector 8, 8a light receiver 9 light emitted from light projector 10 detector controller 11 Relay sequencer 12 Solenoid valve controller.

Claims (1)

[Claims] 1. A photoelectric sensor for detecting the end of a steel strip is provided at the tip of the edge mask, and when the steel strip suddenly meanders and the detector installed at the tip of the edge mask detects the end of the steel strip,
A method of controlling an edge mask for a steel strip of an electrolytic treatment facility, characterized by controlling the edge mask to open immediately.