JP2003293111A - Metallic strip non-contact controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive metallic strip non-contact controller which is adaptable to the meandering of a metallic strip and the change of the width thereof. <P>SOLUTION: The metallic strip non-contact controller is provided with a non-contact controlling means at least having first and second actuators arranged at the both end parts in the width direction on one surface side or obverse and reverse surface sides of a metallic strip so as to be confronted with the metallic strip, and applying electromagnetic force to the metallic strip in a non-contact state, and controlling the behavior thereof; and a frame having a sheet width follow-up mechanism movable so as to change a spacing between he first and second actuators while holding a center position in the width direction between the first and second actuators, and a meandering follow-up mechanism movable while retaining the spacing in the width direction between the first and second actuators. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal band non-contact control device that controls the behavior of a metal band such as warpage and vibration online without contact.

[0002]

2. Description of the Related Art In a line for producing metal strips, keeping the shape of the metal strips without warping and suppressing the vibration of the metal strips not only improves the quality of the metal strips but also the production line. It is an important element that also leads to the improvement of the efficiency of.

FIG. 11 is a view showing the structure of a manufacturing line for a molten zinc plated metal strip.

The metal strip 70 conveyed from the previous step is first annealed in the heating furnace 71 and subjected to surface reduction treatment, and then is passed through the molten zinc pot 72 while being dipped into the molten zinc pot 72, and molten zinc adheres to the surface thereof. To do.

Then, by the gas ejected from the wiping nozzle 73 installed after the molten zinc pot 72,
The amount of plating deposited is adjusted by squeezing the plating deposited on the metal strip.

In the alloying furnace 74 which is the subsequent process, an alloyed layer of Fe and zinc in the metal band is formed, and the quenching band 75 is formed.
After miniaturizing the spangle in
The product is specially rust-proofed and anti-corrosion treated, wound on a coil and shipped.

FIG. 12 is a diagram showing the positional relationship between the wiping nozzle 73 and the metal band as seen from the upstream direction of the metal band.

A wiping gas 77 is ejected from the wiping nozzle 73 in a slit shape so that pressure is uniformly applied to the front and back of the metal strip 70 in the plate width direction. Therefore, FIG.
When the metal strip 70 is warped as shown in FIG. 2 or when the metal strip 70 vibrates in the left-right direction in the drawing, the pressure of the wiping gas 77 is not uniform because the distance from the metal strip 70 is different. The unevenness of the adhesion amount occurs in the width direction and the traveling direction of the metal band 70.

As a method for solving this problem, there is known a technique of controlling the shape or vibration of a metal strip in a non-contact manner using an electromagnet.

FIG. 13 is a diagram for explaining the configuration of a conventional metal strip non-contact control device.

This technique measures the shape of the metal strip with a non-contact position sensor 78 installed in the width direction of the metal strip 70.
Similarly, an electromagnet 79 installed in the width direction of the metal strip 70 is used to apply a suction force 80 to the metal strip 70, thereby correcting a shape defect such as a warp of the metal strip 70 or suppressing vibration. It is a thing.

[0012]

However, when the conventional technique is applied to the non-contact control of the metal strip of the actual machine, when the width of the metal strip 70 to be controlled is changed in the manufacturing line or the processing line. Also, it must be constructed so as to be able to cope with the case where the metal strip 70 meanders in the strip.

FIG. 14 is a diagram showing another configuration example of a conventional metal strip non-contact control device.

In the present embodiment, a plurality of pairs of front and back electromagnets 79 are arranged in a region including the maximum width of the metal strip 70 to be passed.
An electromagnet 79 for controlling the metal strip 70 according to meandering and width change
It is configured to switch and use.

However, since a large number of electromagnets 79 are installed in this configuration, not only the facility cost of the electromagnets 79 but also
There is a problem that an installation stand having a structure capable of withstanding the weight of the electromagnet 79 must be provided and a large amount of cost is required.

FIG. 15 is a diagram showing another configuration example of a conventional metal strip non-contact control device.

This embodiment is disclosed in Japanese Utility Model Laid-Open No. 5-30148, in which a plurality of electromagnets 80 are connected to a metal strip 7.
It is arranged on the electromagnet moving device 81 configured to be movable in the width direction of 0, and the electromagnet moving device 81 is moved in the width direction of the metal strip 70 by the driving current d output via the control circuit (not shown). It is configured to correspond to the meandering of the metal band 70.

However, in this structure, since the plurality of electromagnets 80 are moved as a unit, there is a problem that the meandering of the metal strip 70 can be followed but the width change of the metal strip 70 cannot be followed.

Further, there is no technique disclosed regarding which control method can be used to continue the operation without deteriorating the quality of the metal strip 70 when trying to follow the width change.

The present invention has been made in view of such circumstances, and an object thereof is to provide an inexpensive metal band non-contact control device which can cope with meandering and width change of a metal band.

[0021]

DISCLOSURE OF THE INVENTION The present invention for solving the above-mentioned problems is provided in such a manner that one side or both sides of the front and back sides of a metal strip are arranged so as to oppose the metal strip, and electromagnetic contact is made without contact. While maintaining the center position in the width direction between the non-contact control means having at least the first and second actuators for applying the force to control the behavior of the metal strip, and the first and second actuators, A metal strip non-contact control device comprising: a plate width following mechanism movable so as to change an interval; and a pedestal having a meandering following mechanism movable while maintaining a widthwise interval between the first and second actuators. is there.

Further, the present invention is the metal band non-contact control device according to the above-mentioned invention, wherein the plate width tracking mechanism is provided on the meandering tracking mechanism in the gantry. .

Further, according to the present invention, the first and the opposite sides of the metal strip on both sides in the width direction are arranged so as to face the metal strip, and the behavior of the metal strip is controlled in a non-contact manner by applying an electromagnetic force. And a non-contact control means having at least a second actuator, a first mount on which the first actuator is mounted and which moves in the width direction of the metal strip, and a second actuator, and a metal strip. The first and second mounts are moved so as to change the distance between the two mounts while maintaining the widthwise center position between the second mount that moves in the width direction and the first and second actuators. The contactless control by each actuator is stopped before the passage of the metal strip to move each actuator to a predetermined position, and the actuator is moved to a new control position after the passage of the metal strip. It was a metal strip noncontact control and control means for controlling so as to resume the non-contact control.

Further, according to the present invention, the first and the opposite sides of the metal strip on both sides in the width direction are arranged so as to face the metal strip, and electromagnetic force is applied to control the behavior of the metal strip in a non-contact manner. And a non-contact control means having at least a second actuator, a first mount on which the first actuator is mounted and which moves in the width direction of the metal strip, and a second actuator, and a metal strip. The first and second mounts are moved so as to change the distance between the two mounts while maintaining the widthwise center position between the second mount that moves in the width direction and the first and second actuators. The metal band non-contact control device is provided with a control means for moving each actuator to a new control position while maintaining the non-contact control when the metal band passes through the seam.

[0025]

1 is a diagram showing the configuration of a metal strip non-contact control device according to the present invention.

The metal strip non-contact control device of the present invention is provided with movable electromagnets 2 movably arranged at both ends of the metal strip 1 so as to face the metal strip 1, and at the center of the metal strip 1 facing the metal strip 1. , A fixed electromagnet 3 fixedly arranged, a displacement sensor 4 for measuring the distance from the metal strip 1 at each electromagnet position, an edge sensor 5 for detecting a plate edge of the metal strip 1, and a moving electromagnet 2.
And a displacement sensor 4 and an edge sensor 5 are loaded to move the movable pedestal 6, a drive device 7 for driving the movable pedestal 6, a fixed pedestal 8 on which the fixed electromagnet 3 is loaded, and an electromagnet based on signals from the displacement sensor 4. It is composed of an electromagnet control device 9 that controls a few attractive forces.

Although the moving electromagnet 2 and the fixed electromagnet 3 are provided on the front and back surfaces of the metal strip 1 in this figure, the present invention is not limited to this embodiment. Regarding the arrangement of the electromagnets, there are various forms shown in FIG. 2 showing the arrangement of the electromagnets as seen from the upstream side of the metal band 1, and the present invention can be configured corresponding to each of these forms.

For example, the arrangements shown in FIGS. 2 (2) and 2 (3) are
This is effective when the cross section of the metal strip in the width direction is warped in a substantially C shape and the mobile electromagnet 2 is arranged on the opposite side to the projecting side of both ends in the width direction. That is, the C-warp shape can be corrected with a minimum of equipment.

Therefore, in FIG. 1, the front and back moving pedestals 6 are simultaneously driven by one drive unit 7, but the present invention is not limited to this form and they can be individually driven. It may be one.

Next, the structure of the moving base 6 on which the moving electromagnet 2 is loaded and moved will be described with reference to the drawings.

FIG. 3 is a side view showing the structure of the movable mount 6, and FIG. 4 is a rear view showing the structure of the movable mount 6.

In FIG. 3 or 4, a pair of linear bearings 11 are provided on the base frame 10 installed on the installation surface of the movable frame 6.
"Metal band running surface" made by metal band 1 with appropriate spacing
Are arranged in a direction perpendicular to. Here, the “metal band running surface” refers to a flat surface formed by moving an ideal flat metal band in which no warp or the like occurs.

A screw jack 14 supported by the base 10 is attached to the rear end of the electromagnet slide base 13 supported by the linear bearing 11 via the slide shifter 12. The screw jack 14 rotates while meshing with a worm gear 15 attached to a drive device (not shown), so that the electromagnet slide base 13 can move in a direction perpendicular to the running surface of the metal strip.

Further, on the upper surface of the electromagnet slide base 13, a pair of linear bearings 16 are arranged at appropriate intervals in a direction parallel to the running surface of the metal band 1 formed by the metal band 1. A screw jack 20 supported by the electromagnet slide base 13 is attached to the end of the meandering follow-up slide base 18 supported by the linear bearing 16 via a slide shifter 17.
When 0 is rotated by the meandering follow-up drive device 19, the meandering follow-up slide base 18 can move in a direction parallel to the running surface of the metal strip.

Further, on the meandering follow-up slide base 18, there are column portions 21a and 21b which stand vertically on both sides, and a pair of linear bearings 22 are formed at appropriate intervals so as to connect the column portions 21a and 21b. It is arranged in a direction parallel to the belt running surface.

Then, electromagnet mounts 24a, 24 connected to the linear bearing 22 via a slide shifter 23.
A moving electromagnet 2 and a displacement sensor 4 are attached to each of b so as to face the metal strip 1. The edge sensor 5 (not shown) also includes the electromagnet mounts 24a and 24b.
Installed on at least one of the.

Further, the screw jacks 26 supported by the support columns 21a and 21b are attached to the electromagnet mounting bases 24a and 2b.
It is installed in parallel with the linear bearing 22 by meshing with racks 27a and 27b provided on the 4b. When the screw jack 26 is rotated by the plate width following drive device 25, the electromagnet mounting bases 24a and 24b move in the plate width direction parallel to the running surface of the metal strip.

Here, each electromagnet mounting base 24
In the range in which a and 24b move, the screw jacks 26 are configured so that the spiral directions thereof are opposite to each other. Therefore, the rotation of the screw jack 26 causes the electromagnet mounts 24a and 24b to move in opposite directions. That is, the electromagnet mounts 24a, 24
The b's operate so as to approach each other or move away from each other while keeping their central positions at the same position.

The drive device 7 of FIG. 1 corresponds to the meandering follow-up drive device 19 and the plate width follow-up drive device 25 of FIGS. 3 and 4.

Next, the movable mount 6 constructed as described above.
The action of will be described.

First, when the worm gear 15 is rotated in a state of being meshed with the screw jack 14, the electromagnet slide base 13 moves in a direction perpendicular to the running surface of the metal strip.
The moving electromagnet 2 and the displacement sensor 4 can be adjusted so as to be installed at a predetermined distance from the metal strip 1.

Next, when the screw jack 26 is rotated by the plate width following drive device 25, the electromagnet mounting base 24
Since a and 24b move in opposite directions to each other, the moving electromagnet 2 and the displacement sensor 4 can be adjusted so as to be installed according to the width of the metal strip 1.

When the screw jack 20 is rotated by the meandering follow-up drive device 19, the electromagnet mounting bases 24a and 24b move in the same direction while keeping a distance therebetween, so that the metal strip 1 meanders. 1 can be made to follow a predetermined position.

As described above, according to the structure of the movable platform 6, since the moving mechanisms such as the moving electromagnets 2 are stacked in the vertical direction, the metal strips 1 of the metal strip 1 can be formed even if the space is limited. It becomes possible to follow meandering and width changes. Further, since the meandering follow-up drive device 19 and the plate width follow-up drive device 25 can be arranged only on one side, the installation space is less restricted.

In the present embodiment, the movable pedestal 6 is arranged only on one side of the metal strip 1, but the present invention is not limited to this embodiment, and the movable pedestal 6 is arranged on the metal strip 1. It may be arranged on the front and back sides, or one meandering follow-up drive device 1
Alternatively, the electromagnet mounting racks 24a and 24b of both moving racks 6 may be moved by the single plate width following drive device 25.

Next, a method for following the meandering and width change of the metal strip 1 using the metal strip non-contact control device according to the present invention will be described.

FIG. 5 is a diagram showing the configuration of a system to which the method of following the meandering and width change of the metal strip 1 according to the present invention is applied.

This system includes a follow-up control device 30 for controlling the meandering of the metal strip 1 and the follow-up of width changes, a production schedule of the metal strip 1 and specifications such as width and thickness of the metal strip 1 to be produced. It comprises a host computer 31 provided, a tracking device 32 for tracking the position of the seam which is the width changing position of the metal strip 1, a movable mount 6 constituting a metal strip non-contact control device, an electromagnet control device 9 and the like.

First, the meandering follow-up operation will be described.

The edge sensor 5 provided in the present metal strip control device is a sensor for measuring the position of the edge of the metal strip 1 in the plate width direction. For example, the projector 35 for projecting a strip of light as shown in FIG. And a light receiving element 36 in which a large number of light receiving elements are arranged in the width direction of the metal strip 1.

The metal strip 1 meanders to move to the left and right in the figure, but as a result, the number of light receiving elements received by the light receiver 36 changes. Therefore, the meandering amount and the meandering direction of the metal strip 1 can be detected by detecting the position of the light receiving element that receives the light.

The tracking control device 30 receives the measured value from the edge sensor 5, and when the edge position is deviated from the predetermined position, outputs a control signal corresponding to the deviation amount to the movable pedestal 6. Then, the meandering follow-up drive device 19 is driven to move the meandering follow-up slide base 18 to control the position of the light receiver 36 of the edge sensor 5 so as to follow a predetermined position. By this operation, the moving electromagnet 2 is always in the metal strip 1.
It is possible to follow a position separated by a predetermined distance from the edge of.

The edge sensor 5 used for the meandering follow-up operation is not limited to this embodiment, and electromagnetic force,
The edge position may be detected by measuring the capacitance, and the control operation of the tracking control device 30 may be PI.
Not limited to D control, a well-known control method such as sampling control or preset control may be used.

Next, the following operation when changing the width will be described.

FIG. 7 is a diagram showing a state in which metal strips having different widths are connected.

If metal strips of different widths are to be connected, FIG.
As shown in (1) of FIG. 7, a mode in which metal bands A → B → C are connected so that the width increases, and as shown in (2) of FIG.
It is conceivable that the metal bands A ′ → B ′ → C ′ are connected so that the width decreases. Therefore, it is necessary to consider this form for the tracking operation when changing the width.

The connecting portion of the metal strips 1 having different widths is referred to as a seam, and the tracking device 32 grasps information about where the position of the seam is in the manufacturing process, and the tracking control device 30. Is being input in real time.

FIG. 8 is a flow chart showing the first embodiment of the width change tracking operation of the tracking control device 30.

The tracking control device 30 includes the tracking device 3
The seam position information from No. 1 is monitored, and when the seam reaches a predetermined distance from the non-contact control position, the non-contact control and the meandering follow-up control are stopped (S1). Here, the non-contact control process is stopped by giving a control stop command to the electromagnet control device 9. Note that this stopping operation may be performed for the moving electromagnet 3, and if the fixed electromagnet 3 is used, the non-contact control by the fixed electromagnet 3 may be continued without stopping.

Then, a signal is output to the plate width follow-up drive device 25 to widen the installation position of the moving electromagnet 3 to a predetermined position and retract it (S2). This predetermined position may be a fixed position determined in advance, or may be a position determined corresponding to the width of the next metal strip 1 input from the host computer 31. In accordance with this operation, the electromagnet slide base 13 may be adjusted back and forth according to the specifications of the next metal strip 1.

After the seam passes through the non-contact control position, a signal is output to the plate width following drive device 25 so that the moving electromagnet 2 can be adapted to the specifications (width, thickness) of the metal strip 1 and the like. It is moved to a proper position (S3). This movement to the new position may be executed by outputting a signal designating the position directly to the plate width following drive device 25. Further, the edge sensor 5 is used to move the edge sensor 5 to a predetermined position. It may be controlled so that

Then, when the electromagnet 2 reaches the predetermined position, the non-contact control and the meandering follow-up control are restarted (S4).

According to the width change tracking method according to the present embodiment, the disturbance caused by the passage of the seam does not cause the control failure and the quality is not deteriorated, and the trouble caused by the contact between the metal strip 1 and the movable mount 6 is eliminated. It is possible to prevent it, and it is possible to cope with both cases in which the plate width increases and decreases.

FIG. 9 is a flow chart showing the second embodiment of the width change tracking operation of the tracking control device 30. The present embodiment shows a tracking method when the plate width increases.

The tracking control device 30 includes the tracking device 3
The seam position information from No. 1 is monitored, and when the seam reaches a predetermined distance from the non-contact control position, the meandering follow-up control is stopped (S10). Therefore, the non-contact control continues without stopping. At this time, necessary measures such as changing the control constant of the non-contact control are taken in order to cope with the disturbance caused by the passage of the seam. In addition, according to this operation,
Electromagnet slide base 13 according to the specifications of the following metal strip 1
May be adjusted back and forth.

Then, after the seam passes through the non-contact control position, a signal is output to the plate width following drive device 25 so that the moving electromagnet 2 can be adapted to the specifications (width, thickness) of the metal strip 1 and the like. It is moved to a proper position (S11). This movement to the new position may be executed by outputting a signal designating the position directly to the plate width following drive device 25. Further, the edge sensor 5 is used to move the edge sensor 5 to a predetermined position. It may be controlled so that

Then, when the electromagnet 2 reaches a predetermined position, the meandering follow-up control is restarted (S12).

According to the present embodiment, since the non-contact control can be continued even when passing through the joint, it is possible to manufacture a high quality metal strip as compared with the case where the non-contact control is stopped.

FIG. 10 is a flow chart showing a third embodiment of the width change tracking operation of the tracking control device 30. The present embodiment shows a tracking method when the plate width is reduced.

The tracking control device 30 includes the tracking device 3
The seam position information from No. 1 is monitored, and when the seam reaches a predetermined distance from the non-contact control position, the meandering follow-up control is stopped (S15). Therefore, the non-contact control continues without stopping. At this time, necessary measures such as changing the control constant of the non-contact control are taken in order to cope with the disturbance caused by the passage of the seam. In addition, according to this operation,
Electromagnet slide base 13 according to the specifications of the following metal strip 1
May be adjusted back and forth.

Next, a signal is output to the plate width follow-up drive device 25 to continue the non-contact control of the moving electromagnet 2, and at a new position corresponding to the specifications (width, thickness) of the metal strip 1 and the like. It is moved (S16). This movement to the new position is executed by outputting a signal designating the position directly to the plate width following drive device 25.

After the seam passes through the non-contact control position, a signal is output to the plate width following drive device 25 to finely adjust the position of the moving electromagnet 2 (S17). This fine adjustment may be performed by directly outputting a signal designating a position to the plate width following drive device 25, and using the edge sensor 5 so that the edge sensor 5 comes to a predetermined position. It may be controlled.

Then, when the electromagnet 2 is adjusted to the predetermined position, the meandering tracking control is restarted (S18).

According to the present embodiment, the non-contact control can be continued even when passing through the joint, so that a metal band of high quality can be manufactured as compared with the case where the non-contact control is stopped.

The present invention is not limited to the embodiment described above. Further, each function of the follow-up control does not need to be configured as an integrated device, and may be realized by combining individual control means having each function.

Further, the above-mentioned movement operation signal to the mobile pedestal 6 and the stop signal to the electromagnet control device 9 may be automatically judged and output by the tracking control device 30, or manually operated by the operator. May be.

[0077]

As described above, according to the present invention, it is possible to obtain an inexpensive metal band non-contact control device which can cope with meandering and width change of a metal band.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a metal strip non-contact control device according to the present invention.

FIG. 2 is a view showing the arrangement of electromagnets as seen from the upstream side of a metal strip.

FIG. 3 is a side view showing a configuration of a mobile mount.

FIG. 4 is a rear view showing the configuration of the movable mount.

FIG. 5 is a diagram showing a configuration of a system to which the method of following the meandering and width change of the metal strip according to the present invention is applied.

FIG. 6 is a diagram showing a configuration of an edge sensor.

FIG. 7 is a view showing a state in which metal strips having different widths are connected.

FIG. 8 is a flowchart showing an embodiment of a width change tracking operation of the tracking control device.

FIG. 9 is a flowchart showing another embodiment of the width change tracking operation of the tracking control device.

FIG. 10 is a flowchart showing another embodiment of the width change tracking operation of the tracking control device.

FIG. 11 is a diagram showing a configuration of a production line for a molten zinc plated metal strip.

FIG. 12 is a diagram showing a positional relationship between the wiping nozzle and the metal band as seen from the upstream direction of the metal band.

FIG. 13 is a diagram illustrating a configuration of a conventional metal strip non-contact control device.

FIG. 14 is a diagram showing another configuration example of a conventional metal strip non-contact control device.

FIG. 15 is a diagram showing another configuration example of a conventional metal strip non-contact control device.

[Explanation of symbols]

1 ... Metal strip 2 ... Mobile electromagnet 3 ... Fixed electromagnet 5 ... Edge sensor 6 ... Mobile stand 7 ... Drive device 9 ... Electromagnetic control device 11 ... Linear bearing 12 ... Slide shifter 13 ... Electromagnetic slide base 14 ... Screw jack 16 ... Linear bearing 17 ... Slide shifter 18 ... Slide base for tracking meandering 19 ... Meandering drive device 21a ... Support post 21b ... prop section 24a ... Electromagnetic mounting base 24b ... Electromagnetic mounting base 25 ... Drive device for following plate width 30 ... Follow-up control device 31 ... Host computer 32 ... Tracking device 35 ... Floodlight 36 ... Receiver

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kohei Ishida             1-2-1, Marunouchi, Chiyoda-ku, Tokyo             Main Steel Pipe Co., Ltd. (72) Inventor Hideyuki Suzuki             1-2-1, Marunouchi, Chiyoda-ku, Tokyo             Main Steel Pipe Co., Ltd. F term (reference) 4K027 AA05 AA22 AD01 AE15 AE16                       AE17                 4K038 AA01 BA01 CA01 DA03 EA03                       FA01

Claims (4)

[Claims] 1. A first member, which is arranged on one side or both ends of the front and back sides of the metal band in the width direction so as to face the metal band and applies a non-contact electromagnetic force to control the behavior of the metal band. And a non-contact control means having at least a second actuator, and a plate width following mechanism movable so as to change the distance between the two actuators while maintaining the widthwise central position between the first and second actuators. And a pedestal having a meandering follow-up mechanism that is movable while maintaining the widthwise distance between the first and second actuators. 2. The metal strip non-contact control device according to claim 1, wherein in the mount, the plate width following mechanism is provided on the meandering following mechanism. 3. A first and a second metal piece arranged on one surface or both widthwise ends of the front and back surfaces so as to oppose to the metal belt, respectively, to apply an electromagnetic force to control the behavior of the metal belt in a non-contact manner. A non-contact control means having at least a second actuator; a first mount on which the first actuator is mounted and which moves in the width direction of the metal strip; and a second actuator mounted on the first mount, and While maintaining the width-direction central position between the second mount that moves in the width direction of the metal strip and the first and second actuators, the first and the first actuators may be changed so as to change the distance between the two actuators. 2 is for moving the gantry No. 2 and moving the actuators to predetermined positions by stopping the non-contact control by each actuator before passing the joint of the metal strip, and after moving the joint of the metal strip. A metal strip non-contact control device, comprising: a control unit that moves the cheetah to a new control position and restarts the non-contact control. 4. The first and the second metal strips, which are arranged to face the metal strip on one side or both widthwise ends of the front and back sides of the metal strip so as to face the metal strip, and which apply a magnetic force to control the behavior of the metal strip in a non-contact manner. A non-contact control means having at least a second actuator; a first mount on which the first actuator is mounted and which moves in the width direction of the metal strip; and a second actuator which is mounted, and While maintaining the width-direction central position between the second frame that moves in the width direction of the metal strip and the first and second actuators, the first and the first actuators are arranged to change the distance between the actuators. And a control means for moving each actuator to a new control position while maintaining non-contact control when the metal strip passes through the seam. Non-contact control device.