JPH06320217A - Electromagnetic actuator for leveling shape of strip steel - Google Patents

Abstract

PURPOSE:To improve the performance and to miniaturize the size in an electromagnetic actuator which can level the shape of a strip steel completely. CONSTITUTION:This device is to level the shape of the strip steel wherein plural pairs of electromagnets 3 are disposed above and under a long strip steel 1 elongating in the backward and forward direction, moving horizontally in that direction between the electromagnets, in vertical pairs and in suitable backward and forward intervals and plural distance sensors 2 measuring the position and fluctuation of this strip steel 1 without contact are disposed in suitable intervals in the backward and forward direction and the sectional shape of this strip steel 1 is leveled and held in the linear shape. One of each vertical pair of electromagnets 3 is a solid electromagnet and a distance sensor composed of the distance sensors arranged respectively in the centers of facing surfaces and exciting coils 8 burried in a single or plural concentric circle grooves encircling this distance sensor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic actuator for correcting the shape of strip steel sheet in an iron making process line.

[0002]

2. Description of the Related Art In a steelmaking process line, while hot-dip galvanizing or stripping a strip steel sheet,
It is usual to commercialize it by processing such as annealing. By the way, when the strip steel sheet is conveyed, it is necessary to correct its shape so that the thickness of the hot-dip galvanized layer becomes uniform. Therefore, conventionally, the cross-sectional view of FIG. 3 and its FIG.
As shown in the horizontal sectional view taken along the line IV, three sets of electromagnets are arranged above and below the strip steel plate, that is, in the thickness direction, and three sets of electromagnets are arranged.
An eddy current type distance sensor or a laser type distance sensor 2 for measuring the position of is placed. As shown in the block diagram of FIG. 5, the signal from the distance sensor 2 is subtracted from the target value by the subtractor 4 and output to the control circuit 5. The electromagnet drive circuit 6 to which the signal from the control circuit 5 is input is An exciting current is output to the electromagnet so that the position of the strip steel plate reaches a target value, and the attracting force of the electromagnet corrects the shape of the strip steel plate. In this example, 1 is applied in the transport direction of the strip steel plate.
Although the case of rows is shown, a plurality of rows may be arranged.

[0003]

However, there is an attempt to correct the shape of the strip steel sheet by the attracting force of the electromagnet in this type of device, but the strip steel sheet has a cross-sectional shape in the central portion as shown by the thick solid line. Since the distance between the distance sensor and the electromagnet is different in the left and right direction, the strip steel plate reaches the target position at the sensor position, but the strip steel plate at the electromagnet position The deviation from the target position occurs. For example, in FIG. 3, the electromagnet with respect to the strip steel plate reaches a target value at the sensor position, but deviates from the target position at the electromagnet position. As a result, the shape of the strip steel sheet cannot be completely corrected, and this causes unevenness in the thickness of the galvanized product in the product, resulting in deterioration in quality.

The present invention has been proposed in view of the above circumstances, and provides an electromagnetic actuator for straightening the shape of a strip steel sheet, which is capable of completely straightening the shape of the strip steel sheet, and which achieves high performance and downsizing. The purpose is to

[0005]

To this end, the present invention interposes a long strip steel plate extending in the front-rear direction and horizontally moving in the same direction, and has a pair of upper and lower portions in the front-rear direction as appropriate. In addition to arranging a plurality of pairs of electromagnets, a plurality of distance sensors that measure the position and vibration of the strip steel sheet in a non-contact manner are arranged at appropriate intervals in the front-rear direction. In a strip steel plate shape straightening device for straightening and holding, a distance sensor in which one of a pair of upper and lower electromagnets is arranged at the center of each facing surface, and a single or a plurality of concentric grooves surrounding the distance sensor are provided. It is characterized in that it is an integral electromagnet / distance sensor composed of an embedded exciting coil.

[0006]

According to this structure, the distance sensor and the electromagnet are integrated, and by using the electromagnet having an isotropic shape with respect to the distance sensor, the strip is stripped at the center of the electromagnet that gives the straightening force to the strip steel sheet. Detects the position of the steel plate,
By applying an isotropic attraction force to the strip steel sheet centering on the distance sensor, the strip steel sheet can be controlled to the target position at the position of the electromagnet, and its shape can be corrected straightly.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the entire structure thereof. FIG. 1 (A) is a cross sectional view thereof, and FIG. 1 (B) is of FIG. FIG. 2 shows the electromagnet-distance sensor of FIG. 1B, and FIG. 2A shows its front view, and FIG. 2B shows B of FIG. 1A. It is a -B sectional view.

In the above drawings, the same reference numerals as those in FIGS. 3 to 5 indicate the same members as those in the drawings. First, in FIGS. 1 and 2, the strip steel plate 1 is formed in the plate thickness direction, that is, in the vertical direction. An electromagnet 3 incorporating a sensor 2 for applying an attractive force, a distance sensor 2 for measuring the position of a strip steel plate in the center of the electromagnet 3, a subtracter 4 for comparing the signal from the distance sensor 2 with an input target value and subtracting the signal. , A control circuit 5 for receiving a signal from the subtractor 4 and outputting a control signal, and an electromagnet drive circuit 6 for receiving a signal from the control circuit 5 and outputting an exciting current to an electromagnet (FIG. 5). As shown in FIG. 2, the distance sensor 2 and the electromagnet 3 are integrated, the distance sensor 2 is located at the center, and an iron core with a groove is placed on a concentric circle centered on the distance sensor 2. Wind the coil in the concentric groove of the iron core. Electromagnet 3
Is formed. Further, a plurality of circular electromagnets centering on the distance sensor can be placed on a double or triple concentric circle. Here, a circular electromagnet may have a regular polygonal shape as long as it is isotropic with respect to the distance sensor given as an example.

In such an apparatus, the position of the strip steel plate is measured by the distance sensor 2, and the signal from the distance sensor 2 is subtracted from the target value of the strip steel plate position by the circuit configuration shown in FIG. Is output to the control circuit 5. The electromagnet drive circuit 6 which receives a signal from the control circuit 5 outputs an exciting current to the electromagnet 3 so that the position of the strip steel plate reaches the target value, and the attraction force of the electromagnet 3 moves the strip steel plate 1 to the target position. Correct the shape.

According to such an electromagnet and position sensor, since the electromagnet is isotropically formed around the position sensor, the attraction force acting on the strip steel plate also acts isotropically around the distance sensor. . As a result, the strip steel plate can be moved to the target position at the electromagnet position, and because the positions of the distance sensor and the electromagnet are different,
In the distance sensor, the strip steel plate reaches the target position, but does not reach the target position at the electromagnet position, that is, the shape cannot be corrected.

[0011]

According to such a device, the distance sensor and the electromagnet are integrated, and the electromagnet shape is made to have an isotropic structure centering on the position sensor, so that the strip steel sheet is isotropically attracted from the distance sensor. Power can be applied. This makes it possible to control the strip steel plate to the target position at the electromagnet position, and although the distance steel plate reaches the target position of the strip steel plate, it does not happen that the electromagnet position does not reach the target position. The shape can be completely corrected. Due to the above effect, the unevenness of the zinc plating of the product in the conventional device caused by the warpage is eliminated, and the quality can be improved. Further, the device can be downsized by integrating the sensor and the electromagnet.

In short, according to the present invention, a plurality of pairs of electromagnets are provided above and below the long strip steel plates extending in the front-rear direction and horizontally moving in the same direction, one pair above and below the strips at appropriate intervals in the front-rear direction. In addition to the above, multiple distance sensors that measure the position and vibration of the strip steel plate in a non-contact manner are arranged at appropriate intervals in the front-rear direction, and the cross-sectional shape of the strip steel plate is straightened and held. In the strip steel plate shape correcting device, a distance sensor in which one of a pair of upper and lower electromagnets is disposed at the center of each facing surface, and an exciting coil embedded in one or more concentric circular grooves surrounding the distance sensor. With an integrated electromagnet and distance sensor consisting of, the shape of the strip steel sheet can be completely corrected, and the shape of the strip steel sheet is improved to achieve high performance and downsizing. From getting the electromagnetic actuator,
The present invention is extremely useful in industry.

[Brief description of drawings]

1 shows an embodiment of the present invention, in which FIG. 1 (A) is an overall transverse sectional view thereof, and FIG. 1 (B) is a horizontal sectional view taken along the line BB of FIG. 1 (A).

FIG. 2 shows the electromagnet / sensor of FIG. 1 (B),
The same figure (A) is the front view, and the same figure (B) is B of the same figure (A).
It is a -B sectional view.

FIG. 3 is an overall transverse sectional view showing a posture control means of a strip steel sheet in a conventional strip plant.

FIG. 4 is a horizontal sectional view taken along the line IV-IV in FIG.

5 is a control block diagram of the electromagnet of FIGS. 3 to 4. FIG.

[Explanation of symbols]

 1 Strip Steel Plate 2 Distance Sensor 3 Electromagnet 4 Subtractor 5 Control Circuit 6 Electromagnet Drive Circuit 7 Iron Core 8 Excitation Coil

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Koichi Tokiyasu 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Research Laboratory (72) Inventor Hiroki Fujioka 4 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture 6-22 No. 22 Hiroshima Factory of Mitsubishi Heavy Industries, Ltd.

Claims (1)

[Claims] 1. A long strip steel plate extending in the front-rear direction and horizontally moving in the same direction is sandwiched between the strips, and the strips 1 are arranged above and below the strip strip.
In contrast, a plurality of pairs of electromagnets are arranged at appropriate intervals in the front-rear direction, and a plurality of distance sensors that measure the position and vibration of the strip steel plate in a non-contact manner are arranged at intervals in the front-rear direction. In a strip steel plate shape correcting device for straightening and holding the cross-sectional shape of the strip steel plate in a straight line, a distance sensor in which one of a pair of upper and lower electromagnets is disposed at the center of an opposing surface and a distance sensor surrounding the same are provided. An electromagnetic actuator for correcting the shape of a strip steel sheet, which is an integrated electromagnet / distance sensor comprising an exciting coil embedded in one or more concentric circular grooves.