JP2564397Y2 - Non-contact strip 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 non-contact strip straightening apparatus useful for C-sled control of strip in an iron making process line.

[0002]

2. Description of the Related Art In a steelmaking process line, a strip steel sheet is usually conveyed while being processed by hot-dip galvanizing or annealing. in this case,
When the strip is transported, it is necessary to correct the C-sled of the strip and make the thickness of the hot-dip galvanized coating uniform. The conventional technique of the C-sled correction will be described below with reference to FIGS. 5 to 8 and FIG.

As shown in FIG. 5, a plurality (three in the figure) of electromagnets 2 are arranged in the width direction of the strip 1, and a sensor 3 for measuring the position of the strip 1 is arranged at the center of each electromagnet 2. As shown in FIG. 6, each electromagnet 2 is a pair of an electromagnet 21 on the front side and an electromagnet 22 on the back side.
Then, as shown in FIG. 3, the position detection signal is subtracted from the target value from the sensor 3 and given to the control circuit 4, and the signal from the control circuit 4 is inputted to the drive circuit 5 so that the position of the strip becomes the target value. An exciting current is output to the electromagnet 2 so as to reach, and the C-sled of the strip is corrected by the attractive force of the electromagnet 2. In FIG. 3, reference numeral 6 denotes a subtraction circuit.

[0004] By such C-sled control, as shown in FIG. 7, the strip 1 which has been warped as shown in FIG.
It is corrected as follows.

However, in the portions 1a and 1b outside the sensors 3 and 3 on both sides, the warpage is not corrected, as can be seen from FIG. 7b. The cause will be described with reference to FIG.
FIG. 8 shows the vicinity of the right electromagnet among the three electromagnets 2 shown in FIG. As can be seen from FIG. 8, regarding the electromagnets 2 located on both sides of the three electromagnets, the strip 1 is located at the position of the sensor 3 located at the center X _{O of the} electromagnet 2.
Has reached the target position. However, since the strip 1 is warped at an angle θ direction correction previously, is drawn into the left X _L in the upper electromagnet 21 of the sensor 3, it is attracted by the electromagnet 22 of the right X _R in the lower side of the sensor 3 , As a whole, is sucked in the rotational direction about the position X _{O of the} sensor 3. When the electromagnet 2, which should correct the C-sled of the strip 1 due to the suction force in the rotational direction, is located inside the end of the strip 1 as shown in FIG.
Cannot correct the warpage at the edge of the board. In FIG. 8, reference numeral 51 denotes a drive circuit for the upper electromagnet 21, and reference numeral 52 denotes a drive circuit for the lower electromagnet 22.

[0006] For the above reasons, warpage at the end of the strip 1 has not been able to be corrected conventionally, and as a result, unevenness in the thickness of the galvanized coating has occurred on the product, resulting in quality deterioration.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a non-contact strip straightening apparatus which can also correct a warp at an end of a strip when straightening C.

[0008]

SUMMARY OF THE INVENTION A non-contact strip straightening apparatus according to the present invention comprises an electromagnet provided on a line for transporting a strip and a position of the strip provided at the center of the electromagnet in a width direction of the strip plate. Sensors that
A control circuit that inputs a difference between a signal from the sensor and a target value of the position of the strip and outputs a signal to a drive circuit; and a drive circuit that inputs a signal from the control circuit and drives an electromagnet. In a non-contact strip straightening device,
The electromagnet and the sensor have at least three sets in the strip width direction, and the sensors at both ends are at the ends of the strip ,
The sensor is installed at a position where the position of the strip in the thickness direction can be detected, and the sensors at both ends are installed at the center of the electromagnet in the width direction of the strip.

[0009]

The position of the strip is detected by the sensor, the difference between the signal from the sensor and the target value is determined and output to the control circuit. The control circuit outputs a signal to a drive circuit for the electromagnet. Further, the excitation current is output from the drive circuit to the electromagnet to perform feedback control, so that the strip is moved to a target position by the attraction force of the electromagnet to correct the C-sled.

In addition, among the three or more sets of electromagnets and sensors arranged in the width direction of the strip, sensors at both ends are arranged so as to detect the position in the thickness direction of the strip at each end of the strip. And by being placed in the center of the electromagnet, half of the electromagnet is dislodged from the end of the strip. As a result, the center of the electromagnet, that is, the end of the strip around the sensor is not attracted in the rotating direction, and the warpage of the strip end, which could not be corrected conventionally due to the attraction force in the rotating direction, can be corrected. By correcting the warpage of the end of the strip as described above, the unevenness of the galvanized product caused by the warpage of the end of the strip in the related art is eliminated, and the quality is improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1A, in the present embodiment, three sets of the electromagnet 2 and the sensor 3 are arranged along the strip plate width direction on the strip 1 transport line. Of these three sets of electromagnets 2 and sensors 3, sensors 3 at both ends
Is an end of the strip 1 and is arranged so as to detect the position of the strip 1 in the thickness direction. Half of the electromagnets 2 at both ends are set out from the end of the strip. Each electromagnet 2 applies an attractive force to the strip 1, and FIG.
As shown in FIG. 2, the electromagnet 21 and the electromagnet 21 are provided.
Each sensor 3 detects the position of the strip 1 in the plate thickness direction , and is arranged at the center of the electromagnet 2 in the strip plate width direction. In FIG. 1A, the sensor 3 is arranged at a distance from the electromagnet 2 in the transport direction.
As shown in (b), even if the sensor 3 is placed at the position of the center of gravity of the electromagnet 2, the same correction effect can be obtained. Note that FIG.
FIG. 2 shows a side view including a strip when arranged as in FIG. 1 (b).

The non-contact strip straightening device is driven by inputting a difference between a signal from the sensor 3 and a target value of the strip position as shown in FIG. 3 in addition to the three sets of electromagnets 2 and the sensors 3 described above. The control circuit 4 includes a control circuit 4 that outputs a signal to the circuit 5, and a drive circuit 5 that inputs a signal from the control circuit 4 to drive the electromagnet 3. In FIG. 3, reference numeral 6 denotes a subtraction circuit.

The operation of the non-contact strip straightening apparatus having the above-described configuration will be described. A position detection signal from the sensor 3 is subtracted from a target value of the strip position by a subtraction circuit 6 and a control circuit 4
Is output to The control circuit 4 performs an appropriate control process on the signal from the subtraction circuit 6 and outputs the signal to the drive circuit 5. The drive circuit 5 receives a signal from the control circuit 4 and outputs an exciting current to the electromagnet 2 so that the strip position reaches a target value. The electromagnet 2 applies an attractive force to the strip in accordance with the exciting current, moves the strip to a target position, and corrects the C sled.

In addition to the C-slewing correction, among the three sets of electromagnets 2 and sensors 3, the sensors 3 at both ends detect the position of the strip in the thickness direction at the end of the strip. Is fed back to the exciting currents of the corresponding electromagnets 2 at both ends, so that the end of the strip is controlled to reach the target position. Also, since half of the electromagnets 2 at both ends are protruded outward from the ends of the strip, no attractive force in the rotational direction is applied to the strip.

FIG. 4 shows an actual measurement example of the result . Right side
Sensor 3 is installed at the right end of the strip, and the
When the magnet 2 was also provided, the strip which had been sled C as shown in a before the straightening was successfully corrected to the end of the strip 1 as shown in c. Note that the left end of the strip is
This is the case where the sensor and electromagnet are arranged as
The lip board edge has not been corrected for warpage.

In the embodiment described above, the electromagnet 2 and the sensor 3
The number of sets of electromagnets and sensors in the strip width direction can be increased by appropriately increasing the number of sets of electromagnets and sensors in the strip width direction if the warp cannot be sufficiently corrected between the electromagnets in the strip width direction. . In the embodiment, the electromagnet 2 and the sensor 3
Has been described as a single row in the strip transport direction, but a plurality of rows may be arranged.

[0017]

According to the present invention, in a device for detecting the position of a strip with a sensor and feeding back the position detection signal to an exciting current of an electromagnet to correct the warpage of the strip, at least three sets of strip strip width direction are provided. And the sensors at both ends are the ends of the strip ,
The strip is installed so as to detect the position of the strip in the thickness direction, and is located at the center of the electromagnet. As a result, the suction force in the rotating direction was not applied to the end of the strip, and the C-sled of the strip could be corrected to the end of the strip. Therefore, the quality could be improved, for example, the zinc plating of the product caused by the warpage in the conventional apparatus was not uneven.

[Brief description of the drawings]

FIG. 1 is a diagram showing an arrangement of electromagnets and sensors according to an embodiment of the present invention.

FIG. 2 is a side view of FIG. 1;

FIG. 3 is a configuration diagram of a control system.

FIG. 4 is a diagram showing the relationship between the sensor arrangement and the strip shape after correction according to the present invention.

FIG. 5 is a diagram showing an arrangement of a conventional electromagnet and a sensor.

FIG. 6 is a side view of FIG. 5;

FIG. 7 is a diagram showing a relationship between a conventional sensor arrangement and a strip shape after correction.

FIG. 8 is an explanatory view of the reason why the warpage of the end of the conventional strip cannot be corrected.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Strip 2,21,22 Electromagnet 3 Sensor 4 Control circuit 5,51,52 Drive circuit 6 Subtraction circuit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Koichi Tokiyasu 4-22, Kannonshinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. Hiroshima Research Institute (72) Kazumasa Mihara Kannon-Shinmachi, Nishi-ku, Hiroshima-shi, Hiroshima 4-6--22 Mitsubishi Heavy Industries, Ltd. Hiroshima Works

Claims (1)

(57) [Scope of request for utility model registration] 1. An electromagnet provided on a line for transporting a strip, a sensor for detecting a position of a strip provided at a center of the electromagnet in a width direction of a strip, a signal from the sensor and a target value of the position of the strip. A non-contact strip straightening device including a control circuit that inputs a difference between the control signal and outputs a signal to a drive circuit, and a drive circuit that inputs a signal from the control circuit and drives an electromagnet; At least three in the width direction of the strip, and the sensors at both ends are at the end of the strip ,
A non-contact strip straightening device, wherein the sensors are installed at a position where the position of the strip in the plate thickness direction can be detected, and the sensors at both ends are respectively installed at the center of the electromagnet in the strip plate width direction.