JP2002285309A - Device and method for correcting shape of strip - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a device and a method for correcting the shape of a trip, by which the number of parts can be reduced without lowering the accuracy in the correction of the shape, thereby it becomes possible to realize the cost cutting and the simplification of a control system, and to provide a device for correcting the shape of the strip. SOLUTION: In the device for correcting the shape of the strip 1, a plurality of displacement sensors 6 and electromagnets 7 are arranged oppositely the strip 1 running at an exit of a hot dip plating bath 2 in the width direction of the strip, and the correction of the shape of the strip 1 is carried out by controlling excitation current of the electromagnets 7 by detected signals related to the position of the strip from the displacement sensors 6, the displacement sensors 6 and electromagnets 7 mentioned above, age arranged at the both edges of the strip 1 and at a midpoint of the both edges, and further, at least one displacement sensor 6 and electromagnet 7 are arranged between the midpoint and each edge in such a manner that they are movable in the width direction of the strip 1, and each movable displacement sensor 6 and electromagnet 7 are provided at the maximum point between the midpoint and each edge of the strip 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for correcting the shape of a strip in an iron making process line, particularly a hot-dip plating line for zinc or the like.

[0002]

2. Description of the Related Art In general, in a hot-dip galvanizing line, when galvanizing a running strip, in order to make the thickness of the galvanization on the surface of the strip uniform, the shape of the strip is corrected and then immediately after plating. Air is blown onto the strip surface to control the plating thickness (also referred to as plating adhesion amount or basis weight).

FIG. 5 is a view for explaining a method of controlling a plating thickness by a strip shape correcting device in a conventional hot-dip galvanizing line. As shown
Strip 100 travels through plating bath 101
The molten zinc in the inside of the bath 101 is plated, and a wiping nozzle 102 is installed facing the exit of the plating bath 101,
Air is blown from the wiping nozzle 102 to the surface of the strip 100 immediately after the plating, and control is performed so that the plating thickness becomes uniform.

[0004] However, the rolled strip 100
In general, the warp remains in the width direction, so that the state of blowing air to the surface of the strip 100 is not uniform, and the plating thickness cannot be controlled well.

Therefore, a displacement sensor 103 and an electromagnet 104 are installed in proximity to the wiping nozzle 102, and a current is applied to the electromagnet 104 while constantly detecting the degree of warpage of the strip 100 with the displacement sensor 103 to correct the warpage by the electromagnetic force. Thereafter, air is blown from the wiping nozzle 102 to control the plating thickness.

FIG. 6 is a sectional view of the shape correcting apparatus shown in FIG.
It is an arrow view, and a plurality of electromagnets 104 are arranged facing the mounting table 105 at predetermined intervals in the width direction of the strip 100, and a plurality of displacement sensors 103 are also arranged corresponding to these positions. As described above, the displacement sensor 103 detects the amount of warp d of the strip 100 at the corresponding position, and inputs the detected amount to a control device (not shown). For example, as shown in (c) and (d) of FIG.
The excitation current of the electromagnet 104 is adjusted, and the strip 100 of this portion is moved upward, and the portions (a) and (f) are moved downward. As shown by the dotted line in FIG. The state is corrected to a flat state.

[0007]

However, in the conventional shape correcting apparatus as described above, a plurality of control axes by the displacement sensor 103 and the electromagnet 104 are arranged as narrowly as possible in the width direction of the strip 100. By arranging them (six in FIG. 6), the accuracy of shape correction was improved.

Therefore, the displacement sensor 103 and the electromagnet 104
In addition, there are problems that the number of parts such as cables increases, which leads to an increase in cost and a complicated control system.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and provides a strip shape correcting apparatus and method capable of reducing costs and simplifying a control system by reducing the number of parts without reducing the shape correcting accuracy. The purpose is to:

[0010]

In order to achieve the above object, a strip shape correcting apparatus according to the present invention comprises a plurality of displacement sensors and an electromagnet in a width direction facing a strip running at a hot-dip bath outlet. In a strip shape correction device that arranges and corrects the shape of the strip by controlling the exciting current of the same electromagnet based on the detection signal of the strip position from the same displacement sensor, the displacement sensor and the electromagnet are placed between both edges of the strip and in the middle thereof. It is characterized by being arranged to be movable respectively.

In addition, a plurality of displacement sensors and electromagnets are arranged in the width direction so as to face the strip running at the hot-dip bath outlet, and the exciting current of the electromagnets is controlled by a detection signal of the strip position from the displacement sensor. In the strip shape correcting apparatus for correcting the shape of the strip, the displacement sensor and the electromagnet are arranged at both edges of the strip and at the middle thereof, and at least one of the displacement sensors and the electromagnet is moved between the edges and the middle in the width direction of the strip. The movable displacement sensor and the electromagnet are set at a maximum point between each edge and the middle.

[0012] In the above-mentioned item, the displacement sensor and the electromagnet disposed at both edges of the strip and in the middle thereof are movable in the width direction of the strip.

[0013] A strip shape correcting method according to the present invention also comprises disposing a plurality of displacement sensors and electromagnets in the width direction of the strip so as to face the strip running at the hot-dip bath outlet.
In a strip shape correcting method for correcting the shape of the strip by controlling an exciting current of the electromagnet based on a detection signal of a strip position from the displacement sensor, the displacement sensor and the electromagnet are located at the corresponding positions by detecting both edges of the strip. And an intermediate point between both edges is calculated to dispose the displacement sensor and the electromagnet at the position.

Further, in the preceding paragraph, a maximum point between both edges is calculated, and the displacement sensor and the electromagnet are arranged at the calculated position.

A plurality of displacement sensors and electromagnets are arranged in the width direction of the strip so as to face the strip running at the hot-dip bath outlet, and the excitation current of the electromagnets is controlled by the strip position detection signal from the displacement sensors. A strip shape correcting method for correcting the shape of the strip by detecting a plate shape corrected by a displacement sensor and an electromagnet previously disposed at both edges of the strip and an intermediate point between the both edges, and detecting the shape of the both edges and the intermediate displacement sensor and the electromagnet. The displacement sensor and the electromagnet are moved to each local maximum point between the two.

Also, a plurality of displacement sensors and electromagnets are arranged in the width direction thereof so as to face the strip running at the hot-dip bath outlet, and the exciting current of the electromagnets is controlled by the strip position detection signal from the displacement sensors. In the strip shape correction method for correcting the shape of the strip, the displacement sensor and the electromagnet are moved to both the edges of the strip and an intermediate point between the intermediate displacement sensor and the electromagnet in advance, and the plate shape is detected. In addition, the displacement sensor and the electromagnet are moved and adjusted.

In the above-mentioned item, the data for each coil is accumulated, and the displacement sensor and the electromagnet are previously moved to both edges of the strip and an intermediate point between the intermediate displacement sensor and the electromagnet in accordance with the designated coil. It is characterized by.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, an apparatus and a method for correcting the shape of a strip according to the present invention will be described in detail with reference to the accompanying drawings using embodiments.

[First Embodiment] FIG. 1 is a schematic structural view of a strip shape correcting apparatus showing a first embodiment of the present invention, FIG. 2 is a conceptual diagram of a control axis moving function, and FIG. FIG.

As shown in FIG. 1, the strip 1 is guided by a sink roll 3 and a support roll 4 in a hot-dip plating bath 2 and travels to be plated with hot-dip zinc in the hot-dip plating bath 2. A wiping nozzle 5 is installed in the vicinity of the outlet of the bath 2 so as to face the wiping nozzle 5.
Thus, air is blown on the surface of the strip 1 immediately after plating, and the amount of plating is controlled so as to be uniform in the width direction of the plate.

Then, a displacement sensor 6 and an electromagnet 7 are installed on the mounting table 8 in proximity to the wiping nozzle 5, and a current is applied to the electromagnet 7 while constantly detecting the degree of warpage of the strip 1 with the displacement sensor 6, so that an electromagnetic force is applied. After correcting the warp by force, air is blown from the wiping nozzle 5 to control the amount of plating applied.

As shown in FIG. 2, the electromagnets 7 are arranged facing each other across the five strips 1 at predetermined intervals in the width direction of the strip 1, and the displacement sensors 6 also correspond to these positions. And five are arranged only on one side.

As described above, each displacement sensor 6 detects the amount of warpage of the strip 1 at the corresponding position and inputs the detected amount to the control device 9, and the control device 9 compares the detected amount of warpage at each location with the control target value. Then, the exciting current of each electromagnet 7 is adjusted until the amount of warp reaches the control target value, and the shape of the strip 1 is corrected to a predetermined shape in which the amount of plating applied is uniform.

That is, the control unit 9 compares a signal from the displacement sensor 6 with a control target value by a subtracter (not shown) to calculate an appropriate drive signal for the electromagnet 7 and output the calculated signal. The drive circuit 11 receives an output signal from the arithmetic circuit 10 and excites and drives the electromagnet 7.

In this embodiment, the displacement sensor 6
Among the five control axes by the electromagnet 7, the control axes No. 1 and No. 5 can follow the edge with the change of the strip width W of the strip 1, while the control axes No. 2 and No. 4 Can be moved to the optimum correction position (the maximum point of the plate shape).

More specifically, the displacement sensor 6 and the electromagnet 7 corresponding to the control axes No. 1 and No. 5 and the displacement sensor 6 and the electromagnet 7 corresponding to the control axes No. 2 and NO. The strip 1 is supported movably in the width direction of the strip 1 with respect to the mounting table 8, and is individually driven to predetermined positions by the moving device 12.

The moving device 12 includes an arithmetic circuit 13
The arithmetic circuit 13 controls the NO. 2 and NO. 4 by the signal from the adhesion meter 14 installed on the downstream side of the hot-dip plating line (downstream of the deflection roll 15). The optimum correction position of the shaft is determined (calculated).

The coating weight meter 14 detects the intensity of fluorescent X-rays which are irradiated and received in the width direction of the strip 1 of the strip 1 traveling on the hot-dip plating line and detect the intensity of the fluorescent X-rays. An ordinary one which is known as an apparatus for measuring the coating weight in the width direction of the plate for measuring the coating weight is used.

With this configuration, in correcting the shape of the strip 1 having the predetermined width W, first, as shown in FIG. 3A, both edges of the strip 1 are detected by an edge sensor (not shown). Then, the displacement sensor 6 and the electromagnet 7 corresponding to the control axes No. 1 and No. 5 are moved / positioned to the corresponding edges by the moving device 12 and turned on, and the intermediate point between the two edges (plate shape) The displacement sensor 6 and the electromagnet 7 corresponding to the control axis of No. 3 which is located at the maximum point are also turned on.

As a result, the plate shape of the strip 1 when all the axes are OFF shown by the solid line in FIG. 3A is corrected to the plate shape of the strip 1 when the three axes are ON shown by the two-dot chain line. When
Maximum points are formed between the control axes of No. 3 and between the control axes of No. 3 and No. 5, respectively. Then, the coating weight of each plating on the front and back surfaces in the width direction of the strip plate in this plate shape is measured by the coating weight meter 14.

Next, as shown in FIG. 3 (b), the optimal correction position of the control axes No. 2 and No. 4 is determined by the arithmetic circuit 13 based on the signal from the adhesion amount meter 14, and this is calculated. Arithmetic circuit 1
No. 2 by the moving device 12 based on the signal from
The displacement sensor 6 and the electromagnet 7 corresponding to the control axes No. and No. 4 are moved / positioned to the optimum correction positions and turned on.

As a result, the plate shape of the strip 1 when the three axes are ON indicated by the solid line in FIG.
The plate shape of the strip 1 when the axis is ON is corrected, the plate shape becomes substantially flat, and the amount of plating applied is controlled substantially uniformly in the plate width direction by the wiping nozzle 5.

As described above, in this embodiment, NO.
The control axis is moved to the strip 1 by moving the displacement sensor 6 and the electromagnet 7 corresponding to the control axis of O.4 to the optimum correction position.
The shape correction of the strip 1 can be performed as before without using a large number of control axes at a maximum of 5 axes without increasing the number of parts per control axis without disposing them in the width direction of the strip. The cost reduction and the simplification of the control system can be achieved by the reduction of the number.

[Second Embodiment] FIG. 4 is a schematic structural view of a strip shape correcting apparatus showing a second embodiment of the present invention.

This corresponds to the operation circuit 13 in the first embodiment.
Instead, the respective optimal correction positions between the control axes NO.1 and NO.3 and between the control axes NO.3 and NO. This is an example in which an arithmetic circuit 13A is provided to determine the displacement sensor 6 and the electromagnet 7 corresponding to the control axis by traversing the strip 1 in the width direction of the strip 1.

According to this, the same operation as that of the first embodiment is obtained.
In addition to the effects, since the optimum correction position is quickly determined at the shape correction position, there is an advantage that the shape correction can be performed earlier than in the first embodiment.

The present invention is not limited to the above embodiments,
It goes without saying that various changes can be made without departing from the spirit of the present invention. For example, the adhesion meter 14 in the first embodiment may be provided at another position as appropriate only during a test. Further, the displacement sensor 6 and the electromagnet 7 corresponding to the control axis No. 3 in the first and second embodiments may be configured to be movable in the plate width direction so as to be able to cope with the meandering of the strip 1. In addition, depending on the plate width of the strip, a displacement sensor and an electromagnet corresponding to an intermediate control axis may be provided so as to be movable to an optimal correction position with the control axis being three axes,
Further, the number of control axes may be seven (or more), and two intermediate control axes movable to the optimum correction position may be provided (or more). In addition, between the control axes of NO.1 and NO.3 and with NO.3
The respective optimal correction positions between the control axes of No. 5 may be determined from data for each coil stored in advance.

[0038]

As described above in detail with reference to the embodiments, the invention according to claim 1 of the present invention comprises a plurality of displacement sensors and electromagnets opposed to a strip running at a hot-dip bath outlet. In the strip shape correcting device arranged in the width direction and controlling the exciting current of the same electromagnet by the detection signal of the strip position from the same displacement sensor to correct the shape of the same strip, the displacement sensor and the electromagnet are connected to both edges of the strip. Since the displacement sensors and the electromagnets are arranged movably in the middle of the strip, the displacement sensors and the electromagnets do not need to be arranged closely (many) in the width direction of the strip, and without increasing the size of each displacement sensor and the electromagnet, The shape correction can be performed as before, so that the cost can be reduced and the control system can be simplified by reducing the number of parts.

According to a second aspect of the present invention, a plurality of displacement sensors and electromagnets are arranged in the width direction of the strip so as to face the strip running at the hot-dip bath outlet. In a strip shape correcting apparatus that controls the exciting current of the same electromagnet to correct the shape of the same strip, the displacement sensor and the electromagnet are disposed at both edges of the strip and at the middle thereof, and at least each between the edges and the middle. Since the movable displacement sensor and the electromagnet are disposed so as to be movable in the width direction of one strip, and the movable displacement sensor and the electromagnet are respectively set at local maximum points between the respective edges and the middle, the same operation and effect as the invention of claim 1 are obtained. In addition to this, a further shape correcting effect can be expected.

According to a third aspect of the present invention, in the preceding aspect, the displacement sensor and the electromagnet arranged at both edges of the strip and the intermediate portion thereof can be moved in the width direction of the strip. In addition to the same operations and effects as described above, it is possible to easily cope with the meandering of the strip.

According to a fourth aspect of the present invention, a plurality of displacement sensors and electromagnets are arranged in the width direction of the strip so as to face the strip running at the hot-dip bath outlet, and a detection signal of the strip position from the displacement sensor is provided. In the strip shape correcting method for correcting the shape of the strip by controlling the exciting current of the same electromagnet, the both edges of the strip are detected, the displacement sensor and the electromagnet are arranged at the corresponding positions, and the midpoint between the two edges is detected. Is calculated, and the displacement sensor and the electromagnet are arranged at the position. Therefore, even if the displacement sensor and the electromagnet are not arranged in the width direction of the strip (many), the size of each displacement sensor and the electromagnet is increased. Since the strip shape can be corrected as before without reducing the number of parts, cost can be reduced and the control system can be simplified.

According to a fifth aspect of the present invention, in the preceding aspect, the maximum point between both edges is calculated and the displacement sensor and the electromagnet are arranged at the calculated position. In addition to the effect, a further shape correcting effect can be expected.

According to a sixth aspect of the present invention, a plurality of displacement sensors and electromagnets are arranged in the width direction of the strip so as to face the strip running at the hot-dip bath outlet, and a strip position detection signal from the displacement sensor is provided. In the strip shape correction method of controlling the exciting current of the same electromagnet to correct the shape of the strip by detecting the plate shape corrected by a displacement sensor and an electromagnet previously disposed at both edges of the strip and an intermediate point between both edges, Since the displacement sensor and the electromagnet are moved to the respective local maximum points between the both edges and the intermediate displacement sensor and the electromagnet, further effect of shape correction can be expected in addition to the same operation and effect as the invention of claim 4. .

According to a seventh aspect of the present invention, a plurality of displacement sensors and electromagnets are arranged in the width direction of the strip so as to face the strip running at the hot-dip bath outlet, and a detection signal of the strip position from the displacement sensor is provided. In the strip shape correction method of controlling the exciting current of the same electromagnet to correct the shape of the same strip, in advance, the displacement sensor and the electromagnet are moved to both the edges of the strip and the intermediate point between the intermediate displacement sensor and the electromagnet, Since the shape is detected and the displacement sensor and the electromagnet are moved and adjusted according to the detection result, the same operation and effect as the invention of claim 6 can be obtained.

According to an eighth aspect of the present invention, in the above-mentioned aspect, the data for each coil is accumulated, and the data is previously displaced to both ends of the strip and an intermediate point between the intermediate displacement sensor and the electromagnet in accordance with the designated coil. Since the sensor and the electromagnet are moved, there is an advantage that the shape can be corrected at an early stage in addition to the same operation and effect as the seventh aspect of the present invention.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a strip shape correcting device showing a first embodiment of the present invention.

FIG. 2 is a conceptual diagram of a control axis moving function.

FIG. 3 is an operation explanatory view of a control axis moving function.

FIG. 4 is a schematic configuration diagram of a strip shape correcting device showing a second embodiment of the present invention.

FIG. 5 is an overall configuration diagram of a conventional strip shape correcting device.

FIG. 6 is a view as viewed in the direction of arrows AA in FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Strip 2 Hot-dip bath 3 Sink roll 4 Support roll 5 Wiping nozzle 6 Displacement sensor 7 Electromagnet 8 Mounting base 9 Control device 10 Operation circuit 11 Drive circuit 12 Moving device 13 Operation circuit 13A Operation circuit 14 Adhesion meter 15 Deflection roll

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoji Teramoto 4-22, Kannonshinmachi, Nishi-ku, Hiroshima-shi, Hiroshima Mitsubishi Heavy Industries, Ltd. Hiroshima Works (72) Inventor Hironori Fujioka 4-chome Kannonshinmachi, Nishi-ku, Hiroshima-shi, Hiroshima No. 6-22 Mitsubishi Heavy Industries, Ltd. Hiroshima Works F term (reference) 4K027 AA02 AA05 AA22 AB42 AC59 AD29 AE17

Claims (8)

[Claims] 1. A plurality of displacement sensors and electromagnets are arranged in the width direction thereof in opposition to a strip running at a hot-dip bath outlet, and an excitation current of the electromagnets is controlled by a strip position detection signal from the displacement sensors. A strip shape correcting apparatus for correcting the shape of a strip, wherein the displacement sensor and the electromagnet are movably disposed between both edges of the strip and between them. 2. A plurality of displacement sensors and electromagnets are arranged in the width direction of a strip running at the hot-dip bath outlet, and the exciting current of the electromagnets is controlled by a strip position detection signal from the displacement sensors. In the strip shape correcting apparatus for correcting the shape of the strip, the displacement sensor and the electromagnet are arranged at both edges of the strip and at the middle thereof, and at least one of the displacement sensors and the electromagnet is moved between the edges and the middle in the width direction of the strip. The strip shape correcting device, wherein the movable displacement sensor and the electromagnet are disposed at a maximum point between each edge and the middle. 3. The strip shape correcting device according to claim 2, wherein the displacement sensor and the electromagnet disposed at both edges of the strip and the intermediate portion thereof are movable in the width direction of the strip. 4. A plurality of displacement sensors and electromagnets are arranged in the width direction thereof in opposition to a strip running at the hot-dip bath outlet, and an exciting current of the electromagnets is controlled by a strip position detection signal from the displacement sensors. In the strip shape correcting method for correcting the shape of the strip, the both edges of the strip are detected, the displacement sensor and the electromagnet are arranged at the corresponding position, and the midpoint between the two edges is calculated to set the displacement at the position. A method for correcting a strip shape, comprising disposing a sensor and an electromagnet. 5. The strip shape correcting method according to claim 4, wherein a maximum point between both edges is calculated and the displacement sensor and the electromagnet are arranged at the calculated position. 6. A plurality of displacement sensors and electromagnets are arranged in the width direction of the strip so as to face the strip running at the hot-dip bath outlet, and the exciting current of the electromagnets is controlled by a strip position detection signal from the displacement sensors. A strip shape correcting method for correcting the shape of the strip by detecting a plate shape corrected by a displacement sensor and an electromagnet previously disposed at both edges of the strip and an intermediate point between the both edges, and detecting the shape of the both edges and the intermediate displacement sensor and the electromagnet. Wherein the displacement sensor and the electromagnet are respectively moved to the respective maximum points between them. 7. A plurality of displacement sensors and electromagnets are arranged in the width direction thereof in opposition to the strip running at the hot-dip bath outlet, and the exciting current of the electromagnets is controlled by the strip position detection signal from the displacement sensors. In the strip shape correction method for correcting the shape of the strip, the displacement sensor and the electromagnet are moved to both the edges of the strip and an intermediate point between the intermediate displacement sensor and the electromagnet in advance, and the plate shape is detected. A strip shape correcting method, wherein the displacement sensor and the electromagnet are moved and adjusted together. 8. The apparatus according to claim 7, wherein the data for each coil is accumulated, and the displacement sensor and the electromagnet are moved to the intermediate point between the both edges of the strip and the intermediate displacement sensor and the electromagnet in advance in accordance with the designated coil. A method for correcting the shape of a strip.