JPH0810847A - Shape straightening and vibration damping device for strip - Google Patents

Abstract

PURPOSE:To provide a shape straightening and vibration damping device for a strip which straightens the camber of the strip and does not allow the camber to remain in a wiping nozzle position, etc. CONSTITUTION:This device includes a control circuit 6 which has an upper sensor installed on the side of an electromagnet 3 to detect the position of the strip 1 and a lower sensor 4 installed in a position apart from this electromagnet to detect the position of the strip and is inputted with the two detection signals thereof and a driving circuit 7 which receives the signals from this control circuit and feeds the signals back to the current of the electromagnet. The device executes shape straightening and vibration damping of the strip 1 in the wiping nozzle position, etc., apart from the electromagnet 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to strip shape correction and control of strip vibration in an iron making process line,
The present invention relates to a strip shape correcting / vibrating device.

[0002]

2. Description of the Related Art In an iron-making process line, a strip steel sheet is usually conveyed and processed by hot dip galvanizing, annealing, or the like for commercialization. Further, when the strip is conveyed, it is necessary to correct the shape of the strip and suppress vibration to make the thickness of the hot dip galvanization uniform.

A conventional technique is shown in FIGS. FIG. 4 shows a case where three sets of electromagnets are arranged in the width direction of the strip. One set of electromagnets 3 is arranged in the strip width direction of the strip 1.
A total of three sets are arranged, and a sensor 2 for detecting the position of the strip 1 is arranged between one set of the electromagnets 3. As shown in FIG. 5, the signal from the sensor 2 is subtracted from the target value by the subtractor 9 and output to the control circuit 6. The control circuit 6
The drive circuit 7 receiving the signal from outputs an exciting current to the electromagnet 3 so that the strip 1 reaches a target value, and the attraction force of the electromagnet 3 corrects the shape of the strip 1 (for example, C
Correct the sled).

As a result of the above, as shown in FIG.
The warp of the strip 1 can be corrected at the position of the sensor 2 by the suction force of. However, at the position of the wiping nozzle 5 separated from the sensor 2 and the electromagnet 3, the correction effect is reduced and the warp remains. For this reason, since the strip 1 has a warp at the position of the wiping nozzle that controls the thickness of the hot-dip galvanizing, the thickness of the plating is uneven, resulting in deterioration of quality.

[0005]

In the conventional apparatus, as described above, the warp of the strip remains at the position away from the electromagnet, and the strip warps at the wiping nozzle position, which causes unevenness in the plating thickness. There was a problem.

Therefore, an object of the present invention is to provide a strip shape correcting / vibrating device that corrects the warp of the strip at a wiping nozzle position away from the electromagnet and the warp does not remain.

[0007]

In order to solve the above-mentioned problems, the present invention is an apparatus for correcting the shape of a strip by installing a plurality of sensors and electromagnets facing the strip and installing the sensor on the side of the electromagnet. It has a sensor for detecting the position of the strip and a sensor for detecting the position of the strip installed at a position distant from the electromagnet, and receives a signal from the control circuit for inputting the two detection signals and the control circuit. A drive circuit for feeding back the current of the electromagnet is provided, and the shape of the strip is corrected and the vibration is suppressed at the position of the sensor remote from the electromagnet. Further, it is preferable that the wiping nozzle is provided at a position apart from the electromagnet.

[0008]

According to the above construction, a sensor is provided at, for example, the wiping nozzle position away from the electromagnet to detect the position of the strip, the signal from the sensor is converted into displacement through the integrator, and the displacement is subtracted from the target value. It The vibration component detected by the sensor installed on the electromagnet side is also subtracted from the target value and input to the control circuit. The warp of the strip at the wiping nozzle position is corrected by the drive circuit that receives the signal from the control circuit, and an exciting current is output to the electromagnet so as to reach the target position, and the warp of the strip is corrected by the attraction force of the electromagnet. In addition, since the vibration component of the strip is detected by the sensor provided between the electromagnets and subtracted from the target value and input to the control circuit, the attractive force of the electromagnet acts to suppress the vibration, and the damping effect is obtained. Can also be obtained.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention is shown in FIGS. In the present embodiment, as shown in FIG. 1, three electromagnets 3 each consisting of two in the plate width direction are installed near the wiping nozzle 5 installed on the transport line of the strip 1.

An electromagnet 3 for exerting a suction force on the strip in the width direction of the strip 1, an upper sensor 2 installed between a set of the electromagnets 3 for detecting the position of the strip, and a wiping nozzle 5 are installed. Lower sensor 4 that detects the position of the strip at the wiping nozzle position, subtractor 10 that subtracts the signal of lower sensor 4 from the target value, integrator 8 that integrates the signal from subtractor 10, and integrator 8
A subtracter 9 for subtracting the signal from the upper sensor 2 from the signal output from the control circuit 6, a control circuit 6 including a proportional circuit and a phase compensation circuit (or a proportional circuit and a differential circuit) for inputting the signal from the subtractor 9, and the control The device is composed of a drive circuit 7 which inputs a signal from the circuit and outputs an exciting current to the electromagnet 3.

With this configuration, the position of the strip 1 at the wiping nozzle position is detected by the lower sensor 4, the signal from the lower sensor 4 is subtracted by the subtractor 10 and sent to the integrator 8. The integrator 8 integrates the signal from the subtractor 10 and outputs it to the subtractor 9. Also, the upper sensor 2
However, the position of the strip is detected and the subtractor 9 integrator 8
Is subtracted from the signal output from. The signal output from the subtractor 9 is output to the control circuit 6.
Is output to the drive circuit 7. The drive circuit 7 outputs an exciting current so that the shape of the strip 1 reaches a target value at the wiping nozzle position, and further, the vibration of the strip 1 is reduced.

FIG. 3 shows the effect of correcting the warp of the strip 1 by using this device. At the wiping nozzle position, the value of the strip 1 reaches the target value and the warp is corrected. On the other hand, the warp remains at the upper sensor position, but since it has passed through the wiping nozzle that scrapes the molten zinc,
It does not affect the plating thickness.

As described above, in the present embodiment, it is possible to correct the warp at the position of the wiping nozzle for scraping off the excess molten zinc, the unevenness in the plating thickness is eliminated, and the quality of the strip 1 can be improved. Further, since the vibration of the strip 1 is also suppressed, it is possible to eliminate the unevenness of the plating thickness in the strip conveying direction due to the vibration of the strip 1.

[0014]

According to the present invention, a plurality of sensors and electromagnets are installed so as to face the strip, and the strip is installed on the side of the electromagnet and the sensor is installed at a position away from the electromagnet, for example, at a wiping nozzle position. The two signals are detected and fed back to the current of the electromagnet to correct the shape of the strip at the position of the wiping nozzle away from the electromagnet, and to control the vibration of the strip, so the position of the wiping nozzle that scrapes off the molten zinc, etc. The strip shape became flat and the plating thickness was made uniform, resulting in improved product quality. Further, since the vibration of the strip is also suppressed, it is possible to eliminate the unevenness of the plating thickness in the strip transport direction due to the vibration of the strip.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is likewise a circuit explanatory diagram.

FIG. 3 is also a strip shape correction diagram.

FIG. 4 is an explanatory diagram of a conventional device.

FIG. 5 is a circuit explanatory diagram of the same.

FIG. 6 is also a strip shape correction diagram.

[Explanation of symbols]

 1 strip 2 upper sensor 3 electromagnet 4 lower sensor 5 wiping nozzle 6 control circuit 7 drive circuit 8 integrator 9 subtractor 10 subtractor

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hiroki Fujioka, 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Plant (72) Inventor Kazuhiro Tsukuda, 4-chome Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture 6-22 No. 22 Mitsubishi Heavy Industries Ltd. Hiroshima Works

Claims (2)

[Claims] 1. An apparatus for correcting the shape of a strip by installing a plurality of sensors and electromagnets facing the strip, and a sensor installed on the electromagnet side to detect the position of the strip and a location remote from the electromagnet. A sensor for detecting the position of the strip, and a control circuit for inputting the two detection signals and a drive circuit for receiving a signal from the control circuit and feeding back the current to the electromagnet, and separating from the electromagnet. A strip shape correction / vibration control device that corrects and suppresses the shape of the strip at the position of the sensor. 2. The shape correction of the strip according to claim 1, wherein a wiping nozzle is provided at a position apart from the electromagnet.
Vibration control device.