JP3233781B2 - Strip shape straightening device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for straightening a strip in a steelmaking process line and controlling a strip vibration.
The present invention relates to a device for correcting and shaping a strip.

[0002]

2. Description of the Related Art In a steelmaking process line, it is common to carry out processing such as hot dip galvanizing and annealing while transporting a strip steel sheet to produce a product. Further, when the strip is conveyed, it is necessary to correct the shape of the strip, suppress vibration, and make the thickness of the hot-dip galvanized coating uniform.

FIGS. 4 to 6 show a conventional technique. FIG. 4 shows a case where three sets of electromagnets are arranged in the width direction of the strip.
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. Control circuit 6
The driving circuit 7 which has received the signal from the controller 1 outputs an exciting current to the electromagnet 3 so that the strip 1 reaches the target value, and corrects the shape of the strip 1 by the attraction force of the electromagnet 3 (for example, C).
To correct the sled).

[0004] As a result, as shown in FIG.
Can correct the warpage of the strip 1 at the position of the sensor 2. However, at the position of the wiping nozzle 5 away from the sensor 2 and the electromagnet 3, the effect of the correction decreases, and the warpage remains. For this reason, the strip 1 is warped at the position of the wiping nozzle for controlling the thickness of the hot-dip galvanizing, so that the plating thickness becomes uneven and the quality is lowered.

[0005]

In the conventional apparatus, as described above, the warpage of the strip remains at a position away from the electromagnet, and the strip is warped at the position of the wiping nozzle, so that the plating thickness becomes uneven. There was a problem.

Accordingly, an object of the present invention is to provide a strip shape correction / vibration control device in which the warpage of a strip is corrected at a wiping nozzle position or the like away from the electromagnet and the warpage does not remain.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an apparatus for correcting the shape of a strip by installing a plurality of sensors and electromagnets facing the strip, and installing the sensor and the electromagnet on the side of the electromagnet. Detect strip position
A first sensor, installed in a position away from the electromagnet and a second sensor for detecting the position of the strip, or the second sensor
After taking the deviation of these signals from the target value with the first subtractor,
Input to the divider, and the output signal and the signal from the first sensor
By taking the deviation of the second subtractor, this deviation becomes zero
Controlling the current of the electromagnet via the drive circuit so that
Characterized in that that. It is preferable that a wiping nozzle is provided at a position away from the electromagnet.

[0008]

According to the above construction, a second sensor is provided at, for example, a wiping nozzle position away from the electromagnet to detect the position of the strip, and a signal from the second sensor is converted by the first subtractor.
After calculating the deviation from the target value, it is input to the integrator. this
Integrator output signal and strip installed on the side of electromagnet
The deviation from the signal from the first sensor for detecting the position of
Taken by a subtractor. And the deviation in the second subtractor becomes zero
Exciting current to the electromagnet via the drive circuit so that
The strip is warped by the control of the attraction force of the electromagnet.

[0009]

1 to 3 show an embodiment of the present invention. In the present embodiment, as shown in FIG. 1, three sets of two electromagnets 3 each having a pair in the plate width direction are installed in the vicinity of the wiping nozzle 5 installed on the strip 1 transport line.

An electromagnet 3 for applying an attractive force to the strip in the width direction of the strip 1, an upper sensor 2 installed between a pair of the electromagnets 3 for detecting the position of the strip, and a wiping nozzle 5 A lower sensor 4 for detecting the position of the strip at the position of the wiping nozzle, a subtracter 10 for subtracting a signal of the lower sensor 4 from a target value, an integrator 8 for integrating a signal from the subtracter 10, an integrator 8
Subtractor 9 for subtracting the signal of the upper sensor 2 from the signal outputted from the control circuit 6, a control circuit 6 comprising 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 same control The device is constituted by a drive circuit 7 which inputs a signal from the circuit and outputs an exciting current to the electromagnet 3.

[0011] Because the thus constituted, the position of the strip 1 in the wiping nozzle position is detected by the lower sensor 4, the signal from the lower sensor 4 Re subtraction of <br/> by the subtractor 10 integrator 8 It is sent to. The integrator 8 integrates the signal from the subtractor 10 and outputs the signal to the subtractor 9. The upper sensor 2 also detects the position of the strip, and the subtractor 9 subtracts the signal from the signal output from the integrator 8. The signal output from the subtracter 9 is output to the control circuit 6 . The signal from the control circuit 6 is output to the drive circuit 7. Drive circuit 7
After that, the exciting current is output so that the shape of the strip 1 reaches the target value at the position of the wiping nozzle and further, the vibration of the strip 1 is reduced.

FIG. 3 shows the effect of correcting the warpage of the strip 1 by using the present apparatus. At the wiping nozzle position, the value of the strip 1 reaches the target value, and the warpage is corrected. On the other hand, the warpage remains at the upper sensor position, but since it has passed through the wiping nozzle that scrapes the molten zinc,
There is no effect on plating thickness.

As described above, in the present embodiment, the warpage at the position of the wiping nozzle for scraping off excess molten zinc could be corrected, the plating thickness was not uneven, and the quality of the strip 1 could be improved. Further, since the vibration of the strip 1 is also suppressed, it is possible to eliminate the uneven plating thickness in the strip transport direction due to the vibration of the strip 1.

[0014]

The present invention is directed to a sensor provided with a plurality of sensors and electromagnets opposed to a strip, and a sensor located at the side of the electromagnet and a sensor installed at a position, for example, a wiping nozzle remote from the electromagnets. Detecting and feeding back the two signals 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, etc. As a result, the strip shape became flat, and the plating thickness was made uniform, thereby improving the product quality. Further, since the vibration of the strip is also suppressed, the unevenness of the plating thickness in the strip transport direction due to the vibration of the strip can be eliminated.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram of the circuit.

FIG. 3 is also a strip shape correction diagram.

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

FIG. 5 is an explanatory diagram of the circuit.

FIG. 6 is a strip shape correction diagram.

[Explanation of symbols]

 DESCRIPTION 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

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Koichi Koyasu 4-22, Kannonshinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. Hiroshima Research Laboratory (72) Inventor Hiroki Fujioka Kannon-Shimmachi 4 in Nishi-ku, Hiroshima-shi, Hiroshima No. 6-22, Mitsubishi Heavy Industries, Ltd., Hiroshima Works (72) Inventor Kazuhiro Tsukuda 4-6-1, Kannon Shinmachi, Nishi-ku, Hiroshima, Hiroshima Prefecture, Mitsubishi Heavy Industries, Ltd., Hiroshima Works (56) References JP-A-4-365822 (JP, A) JP-A-63-174723 (JP, A)

Claims (2)

(57) [Claims] 1. An apparatus for correcting the shape of a strip by installing a plurality of sensors and electromagnets facing the strip and detecting the position of the strip by installing the electromagnet on the side of the electromagnet .
Has a first sensor and a second sensor for detecting the position of the installed strip at a position away from the electromagnet, the second sensor
After subtracting the signal from the target value with the first subtractor, integrate
Of the output signal and the signal from the first sensor.
By taking the deviation with the second subtractor, this deviation becomes zero.
To control the current of the electromagnet through the drive circuit
A shape correcting device for a strip. 2. The strip straightening device according to claim 1, wherein a wiping nozzle is provided at a position away from the electromagnet.
Place .