WO2016092601A1 - Metal strip stabilizer, and method of manufacturing hot-dip plated metal strip - Google Patents

Abstract

In this metal strip stabilizer, electromagnets are arranged on a metal strip manufacturing line which bonds multiple metal strips together and continuously conveys the strips, and the electromagnets, aligned in the metal strip width direction, are used to control, in a contactless manner, the positions of the metal strips conveyed on the manufacturing line, wherein, upon passage of a bond between metal strips, the control involves selective use of electromagnets, the selection of electromagnets being made only from those electromagnets which are arranged in a range that is narrower than the width of the preceding metal strip or the succeeding metal strip, whichever is narrower.

Description

Metal strip stabilizer and hot-plated metal strip manufacturing method

The present invention relates to a stabilizing device for stably maintaining a pass line of a metal strip and a method for manufacturing a hot-dip metal strip using the same.

In metal line manufacturing lines, keeping the metal band pass line stable by suppressing warpage and vibration of the metal band or biasing of the metal band front and back (plate thickness direction) can improve the quality of the metal band. In addition to improving, it also contributes to improving the efficiency of the production line.

For example, in the production line of the hot-dip metal strip, there is a step of attaching the hot metal to the surface of the metal strip by passing the metal strip while being immersed in the hot metal bath. In this step, in order to suppress the occurrence of unevenness in the amount of adhesion of the molten metal, adjustment to wipe off the excess molten metal adhering to the metal band by the wiping gas ejected from the gas wiper provided after the molten metal bath is performed. Done.

In the adjustment of the adhesion amount of the molten metal by the gas wiper, it is necessary to eject the wiping gas from the gas wiper so that the pressure is uniformly applied to the front and back surfaces of the metal strip in the plate width direction and the plate passing direction. Therefore, the distance between the gas wiper and the metal band is constant, such as when the metal band is vibrating, when the metal band is warped, or when the pass line of the metal band is biased to either the front side or the back side. Otherwise, the pressure of the wiping gas is not uniform in the plate width direction and the plate passing direction. As a result, there arises a problem that uneven adhesion of the molten metal occurs in the front and back of the metal band, the plate width direction, and the sheet passing direction.

As a method for solving such problems, when the metal band is a magnetic metal band (for example, a steel band), the warp and vibration of the metal band are suppressed in a non-contact manner using an electromagnet, and the pass line of the metal band is Stabilizing techniques are known.

For example, a pair of electromagnets are arranged so as to face each other with respect to a target pass line to be passed through a metal band, and the attraction force of each electromagnet is switched between each other according to a signal from a separately provided position detector A method of acting on a metal strip is known (see Patent Document 1).

At that time, generally, the warp of the metal band is often in a shape called C warp warped in the width direction of the metal band as shown in FIG. As seen from FIG. 11, since there are many combinations of the bending mode (string vibration) shown in FIG. 11 (a) and the torsion mode shown in FIG. 11 (b), the electromagnet has a central portion in the plate width direction of the metal strip and both edge portions. It is desirable to install in three places.

On the other hand, in the metal band production line, products with various plate widths are usually produced in one line. For example, in a production line for a hot dip galvanized steel strip, products with a plate width in the range of 500 to 1850 mm are produced.

In order to deal with such metal strips having various plate widths, a technique has been proposed in which a plurality of electromagnets are arranged in the plate width direction of the metal strips and the electromagnets used are electrically switched according to the plate width of the metal strips. (See Patent Document 2).

According to this technology, the range in which the magnetic force is generated can be instantaneously switched with respect to the change in the plate width of the metal band, so even if the plate width of the metal band changes, the warp and vibration of the metal band can be prevented. It is said that it can be effectively suppressed.

Japanese Patent Laid-Open No. 2-62355 JP 2005-232568 A

In a continuous production line for metal bands, the metal band is continuously passed by joining the tail end of the preceding metal band and the tip of the subsequent metal band by welding.

Therefore, when the plate width of the preceding metal strip and the plate width of the succeeding metal strip are different, a step is generated in the plate width direction at the joint between the preceding metal strip and the following metal strip. Therefore, depending on the production line, in order to prevent the metal strip from breaking from the stepped portion, notching that forms notches such as arcs so as to include both edge portions in the plate width direction of the joint portion is performed. There is.

In any case, at the joint between the two metal bands (preceding metal band and trailing metal band), the rigidity of both edges in the plate width direction changes compared to the steady part in the same metal band, and the attractive force of the electromagnet The degree of deformation of the metal band with respect to changes.

Therefore, even if an attempt is made to control the joint between two metal bands in the same manner as the stationary part in the same metal band using the techniques described in Patent Documents 1 and 2, it cannot be stably controlled. There is a risk that the belt contacts the electromagnet.

The present invention has been made in view of the above problems, and the object of the present invention is to provide a metal strip that can stably control the passage position (pass line) of the metal strip even at the joint between the metal strips. It is to provide a stabilizer and a method for producing a hot-dip metal strip using the same.

The present inventors have intensively studied to solve the above problems. As a result, in the metal band stabilizer that controls the passing position (pass line) of the metal band, when the joint between the metal bands passes, the electromagnet to be used is selectively switched, so that the control is stably performed. I found that I can continue.

The present invention has been made based on the above findings, and the gist thereof is as follows.

[1] Using an electromagnet that is installed in a metal band production line that joins and continuously passes a plurality of metal bands, and the positions of the metal bands that are traveling in the line are arranged in the width direction of the metal band A metal band stabilizer controlled without contact,
A displacement sensor for measuring the position of the metal strip in a non-contact manner;
An electromagnet selection device that performs electromagnet selection based on plate width information before and after the joint of the metal strip;
A joint position information input means for acquiring timing for performing electromagnet selection and instructing the electromagnet selection device;
An operation amount calculation device for determining a current to be passed through the selected electromagnet based on at least information on the displacement sensor and information on the selected electromagnet;
When the joint between metal strips passes, it is selectively used only from electromagnets arranged within a narrower range than the narrower plate width of the preceding metal strip and the trailing metal strip. Metal band stabilizer to control.

[2] having an electromagnet selection device that performs electromagnet selection based on information on the plate width of the steady portion of the metal strip and information on the minimum plate width of a series of metal strips passed through the production line;
When the joint between the metal bands passes, the electromagnet is selectively used and controlled only from electromagnets arranged in a range narrower than the minimum plate width of a series of metal bands passed through the production line. 1] The metal band stabilizer according to [1].

[3] An adhering step for adhering molten metal to a metal band in a sheet passing through a production line, an adjusting step for adjusting an adhering amount of the molten metal with a gas wiper for wiping off excess molten metal adhering to the metal band, The manufacturing method of the hot-dip metal strip which has a control process which controls the position of the said metal strip non-contactingly by the metal strip stabilizer as described in [1] or [2].

According to the present invention, the metal band passage position (pass line) can be stably controlled even at the joint between the metal bands.

FIG. 1 is a schematic diagram showing the configuration of a metal strip stabilizer according to Embodiment 1 of the present invention. FIG. 2 is a view of the metal strip stabilizer according to the first embodiment of the present invention as viewed from the direction of the metal strip. FIG. 3 is a block diagram showing a configuration of a control unit in a conventional metal strip stabilizer. FIG. 4 is a schematic diagram showing the force acting on the metal band when the position of the metal band is stably controlled. FIG. 5 is a schematic diagram showing the force acting on the metal band when the position of the metal band is not stably controlled. FIG. 6 is a schematic diagram for explaining a method of controlling the joint in the metal strip stabilizer according to the first embodiment of the present invention. FIG. 7 is a block diagram illustrating a configuration of a control unit in the metal strip stabilizer according to the first embodiment of the present invention. FIG. 8 is a schematic view showing a part of a production line for a general hot-dip metal strip. FIG. 9 is an enlarged view of the vicinity of the gas wiper of the production line for the hot-dip metal strip. FIG. 10 is a diagram illustrating the warp shape of the metal strip. FIG. 11 is a diagram for explaining the vibration mode of the metal band.

Embodiments of the present invention will be described with reference to the drawings. Here, a magnetic metal band (steel band or the like) is used as the metal band.

[Embodiment 1]
A metal band stabilizer according to Embodiment 1 of the present invention will be described.

FIG. 1 is a diagram showing a configuration of a metal strip stabilizer 1 according to Embodiment 1 of the present invention. The metal band stabilizer 1 receives a signal from the non-contact displacement sensor 3 arranged in the plate width direction of the metal band 2 moving upward in FIG. It comprises a control unit 4 that outputs, and a plurality of electromagnets 5 that control the position of the metal strip by a control signal from the control unit 4.

FIG. 2 is a view showing the arrangement of the electromagnets 5 as viewed from the plate passing direction of the metal strip 2. Here, W _min represents the minimum plate width of the metal strip that is passed through the metal strip production line in which the metal strip stabilizer 1 is installed, and W _max represents the maximum plate width.

The maximum plate width W _max and the minimum plate width W _min are respectively the maximum plate width and the minimum plate width of the metal strip that are continuously passed between the planned stop and the planned stop in the metal strip production line. The ratio between the maximum plate width W _max and the minimum plate width W _min is 4 or less.

The electromagnets 5 are arranged so as to face each other with the metal strip 2 sandwiched between the center portion and both edge portions of the minimum plate width W _min (in FIG. 2, 5a-5b, 5c-5d, 5e-). 3 pairs of 5f). Further, a plurality of pairs of electromagnets are arranged in a range wider than the minimum plate width and narrower than the maximum plate width so as to sandwich the metal band 2 (in FIG. 2, 5g-5h, 5i-5j, 6 pairs of 5k-5l, 5m-5n, 5o-5p, 5q-5r).

The non-contact displacement sensor 3 is disposed on one side of the metal strip 2 in the vicinity of each electromagnet pair (in FIG. 2, nine pieces 3a, 3b, 3c, 3d, 3e, 3f, 3g, 3h, and 3i). . This is because measuring the distance from both sides of the metal strip 2 makes it difficult to select the electromagnet 5 to be used and to determine the magnitude of the current, resulting in hindrance to the control of the electromagnet 5.

The non-contact displacement sensor 3 can be of any type such as an eddy current type or an optical type such as a laser as long as the distance from the metal strip 2 can be measured appropriately.

In addition, as shown in FIG. 2, the non-contact displacement sensor 3 is easier to control if it is installed in each electromagnet pair. However, you may install the non-contact displacement sensor 3 of the number different from the number of electromagnet pairs. For example, a plurality of pairs of electromagnets may be controlled based on the distance measured by one non-contact displacement sensor 3, or conversely, a pair of electromagnets may be controlled based on the distance measured by a plurality of non-contact displacement sensors 3. The electromagnet may be controlled.

Here, first, the controller 4X in the conventional metal band stabilizer will be described.

FIG. 3 is a block diagram showing the configuration of the control unit 4X in the conventional metal band stabilizer. Here, only the control of the electromagnet pairs 5a and 5b at the center in the plate width direction is shown, but the control of the other electromagnet pairs is the same.

As shown in FIG. 3, the control unit 4X of the conventional metal band stabilizer includes an operation amount calculation device 6, a front / back distribution device 7, and amplifiers 8a and 8b.

The manipulated variable calculation device 6 performs processing such as proportionality, differentiation, integration, etc. on the deviation signal between the measured value of the displacement of the metal strip 2 by the non-contact displacement sensor 3a and the target value input / set by the input means 9. For example, PID control) is performed, and a control signal for controlling the position of the metal band 2 is output.

The front / back distribution device 7 distributes the control signal calculated by the operation amount calculation device 6 to the electromagnet 5a for the surface of the metal band 2 and the electromagnet 5b for the back surface.

The amplifier 8a sends current to the electromagnet 5a in accordance with the front surface control signal distributed by the front / back distribution device 7, and the amplifier 8b supplies current to the electromagnet 5b in accordance with the back surface control signal distributed by the front / back distribution device 7. Shed. As described above, an attractive force is generated when current flows through the electromagnet 5a or 5b, and the warp and / or vibration of the metal band 2 is suppressed, and the passing position of the metal band 2 is controlled.

Here, when the metal strip 2 is moved by the attractive force of the electromagnet 5, a force as shown in FIG. In FIG. 4, A, B, and C indicate the attractive force of the electromagnet 5 a, and D indicates the restoring force of the metal strip 2. FIG. 4 shows a case where the metal band 2 is drawn to the target position using the electromagnet 5a because the metal band 2 has moved away from the non-contact displacement sensor 3a in FIG.

In FIG. 4, the metal band 2 moves toward the electromagnet 5a by the attractive force of the electromagnet 5a, but the attractive force of the electromagnet 5a increases as the metal band 2 approaches the electromagnet 5a, and the current flowing through the electromagnet 5a increases. growing. That is, as the current supplied to the electromagnet 5a increases, the attractive force increases as A → B → C in FIG.

On the other hand, due to the rigidity of the metal band 2 and the tension in the plate passing direction, the metal band 2 has a restoring force that returns to the position before the movement due to the attractive force of the electromagnet 5a in proportion to the amount of movement of the metal band 2. To do. The restoring force acts in the direction opposite to the moving direction of the metal strip 2 by the electromagnet 5a, that is, the direction opposite to the attractive force of the electromagnet 5a. When the attraction force of the electromagnet 5a balances with the restoring force of the metal band 2, the movement of the metal band 2 stops, and the metal band 2 becomes stable at this balance point.

A current is supplied to the electromagnet 5a in accordance with the difference in distance between the position of the metal band 2 measured by the non-contact displacement sensor 3a and the target position, and current is supplied to the electromagnet 5a until the metal band 2 reaches the target position by feedback control. The metal strip 2 is moved to the target position while gradually increasing the current. For feedback control, a control method such as PID control can be used as appropriate.

When the metal band 2 moves in the direction approaching the electromagnet 5a at this balance point, the restoring force of the metal band 2 increases, the metal band 2 tries to return to the balance point, and the metal band 2 moves away from the electromagnet 5a. When it moves to (2), the attractive force of the electromagnet 5a increases, and the metal strip 2 tries to return to the balance point. That is, the metal band 2 can be stably held at this balance point.

However, as described above, at the joint between the preceding metal band and the succeeding metal band, there is a step due to a change in the plate width or a notch such as an arc shape at the edge in the plate width direction. In some cases, the rigidity of the metal belt 2 partially decreases, the tension in the plate passing direction becomes uneven, and the restoring force of the metal strip 2 and the attractive force of the electromagnet 5a may not balance at the target position.

For example, as shown in FIG. 5, in the case where the restoring force of the metal band 2 is small, if the current supplied to the electromagnet 5a is increased by feedback control, the restoring force and the attractive force are exceeded when a certain current value is exceeded. There is no balance point. Therefore, the metal band 2 cannot be stabilized, and there is a risk that the metal band 2 is attracted to the electromagnet 5a as it is and contacted. In order to avoid this, if the current supply to the electromagnet 5a is stopped, the metal band 2 returns to its original position by its restoring force, and contact with the electromagnet 5a can be prevented, but the amount of adhesion of the molten metal is uneven. turn into.

The ideal control is to follow the current flowing through the electromagnet as the metal band moves, but the electromagnet's response speed is limited and fast control is not possible, so the metal band's restoring force and electromagnet's attractive force at the target position. In an unstable state where there is no balance point, control using an electromagnet is difficult.

Therefore, in the first embodiment, only the electromagnet selected from the electromagnets in the region which is not affected by the shape change of the edge portion in the plate width direction (step difference due to plate width change, notch such as arc shape) at the joint between the metal bands. Control is performed stably by performing control using.

Here, the case where the preceding metal band 2a and the subsequent metal band 2b are joined by the joint 10 and continuously passed through will be described with reference to FIG.

6, the prior metal strip 2a is a plate width _{W a,} the plate width direction central portion of the electromagnet 5a-5b, and plate width direction edge portions of the electromagnet 5k-5l, an electromagnet pairs 3 positions of 5 m-5n it is desirable to control, the trailing metal strip 2b is narrow _{W b} plate width than _{W a,} the plate width direction central portion of the electromagnet 5a-5b, and plate width direction edge portions of the electromagnet 5g-5h, 5i-5j It is desirable to control with three electromagnet pairs.

On the other hand, at the edge portion in the plate width direction of the joint portion 10 of the preceding metal strip 2a and the succeeding metal strip 2b, there is a step due to a change in the plate width, so which electromagnet is used is important.

Therefore, in the first embodiment, the control unit 4A receives the positional information of the joint 10 and is a region that is not affected by the shape change of the edge portion in the plate width direction at the timing when the joint 10 passes through the metal strip stabilizer 1. The electromagnet 5 is selected and used so as to be controlled by the electromagnet located in the position. For example, the electromagnet 5 is selected and used so as to be controlled by three electromagnet pairs: electromagnets 5a-5b at the center in the plate width direction and electromagnets 5g-5h, 5i-5j at the edge in the plate width direction.

In this way, if an electromagnet located in a narrower range than the narrower plate width of the preceding metal strip 2a and the subsequent metal strip 2b is used, the influence of the shape change of the edge portion in the plate width direction can be reduced. Control can be performed stably without receiving.

The bonding portion 10 at the timing of passing through the metal strip stabilizer 1, only electromagnets selected from the electromagnet is located in a region smaller than the minimum sheet width W _min to control by, selected and used electromagnet 5 May be. That is, here, the electromagnet 5 is controlled so as to be controlled by the electromagnet 5a-5b at the central portion in the plate width direction and the electromagnet pairs at the central portion side of the electromagnets 5c-5d and 5e-5f from the edge portion in the plate width direction. You may select and use.

At that time, when both the preceding metal band 2a and the trailing metal band 2b are wider than the minimum plate width _Wmin , the position where the metal band 2 is controlled is far from the edge in the plate width direction. Although the ability to suppress vibration is slightly reduced, the basic control of stable control is possible without being affected by the shape change of the edge portion in the plate width direction, regardless of the plate width of the metal strip 2. Moreover, since the electromagnet 5 is switched, there is an advantage that the control becomes easy.

The timing for selectively switching the electromagnet 5 at the joint 10 takes into consideration the plate speed and the accuracy of positional information of the joint 10 such as switching within a range of 2 m before and after the joint 10 passes through the metal band stabilizer 1. May be set as appropriate.

In addition, the position information of the joint 10 may be received from the operation control of the production line from the upper control unit, or may be received from a detector of the joint installed separately.

FIG. 7 is a block diagram of the control unit 4A in the first embodiment of the present invention. Here, only the control of the electromagnets 5a and 5b in the center portion in the plate width direction is shown, but the control of the other electromagnet pairs is the same.

7, the control unit 4A according to the first embodiment of the present invention includes an operation amount calculation device 6, a front / back distribution device 7, amplifiers 8a and 8b, and an electromagnet selection device 11.

The operation amount is calculated from the deviation signal between the measured value of the displacement of the metal strip 2 by the non-contact displacement sensor 3a and the target value input / set by the input means 9, as in the conventional control unit 4X described above. However, only when the electromagnet 5a or the electromagnet 5b is used after the electromagnet selection device 11 determines whether or not the electromagnet 5a, 5b is used based on the position information of the joint 10 from the joint position information input means 9a. Is output to control the passing position of the metal strip 2.

Here, for convenience of explanation, the electromagnets 5a and 5b are taken as an example. However, in practice, the electromagnets 5a and 5b are always used, and it is substantially determined whether or not they are used. It will be 5c-5r.

As described above, in the first embodiment, the control unit 4A uses the electromagnet selection device 11 that performs electromagnet selection based on the plate width information before and after the joint portion 10, and at least information on the non-contact displacement sensor 3 and the electromagnet selection device 11. Based on information on the selected electromagnet, an operation amount calculation device 6 that determines a current value to be passed through the selected electromagnet, and a control signal of the current value calculated by the operation amount calculation device 6 is used as an electromagnet for the surface of the metal band 2. In addition, the front / back distribution device 7 that distributes the electromagnets for the back surface, the amplifier 8a that sends current to the electromagnets for the front surface according to the control signal for the surface distributed by the front / back distribution device 7, and the back surface distributed by the front / back distribution device 7 In accordance with the control signal, there is provided an amplifier 8b for passing a current to the back electromagnet.

As described above, when the joint 10 is controlled by only the electromagnet selected from the electromagnets located in the region narrower than the minimum plate width W _min at the timing when the joint 10 passes through the metal band stabilizer 1, the electromagnet selection device 11 selects an electromagnet to be used at that time based on information on the minimum plate width.

Then, as an input means to the control unit 4A, the displacement of the metal strip 2 is measured, the non-contact displacement sensor 3 that inputs the measured value to the electromagnet selection device 11, and the target value of the displacement of the metal strip 2 is calculated. An input means 9 for inputting to the device 6 and a joint position information input means 9a for acquiring timing for performing electromagnet selection corresponding to the joint 10 and inputting position information of the joint 10 to the electromagnet selecting device 11 are provided.

By such Embodiment 1, also in the junction part 10 between metal bands, the metal band 2 and the electromagnet 5 do not contact, without being influenced by the shape change of the edge part of a plate width direction, and the passage position of a metal band Can be stably controlled.

[Embodiment 2]
As a second embodiment of the present invention, a configuration example when the metal strip stabilizer 1 according to the first embodiment of the present invention is arranged in a hot-dip metal strip production line will be described.

FIG. 8 is a schematic view showing a part of a general hot-dip metal strip production line.

In the production line for the hot-dip metal strip shown in FIG. 8, the metal strip 2 is transported from a previous process such as a cold rolling process and annealed in an annealing furnace 12 maintained in a non-oxidizing or reducing atmosphere. After that, it is cooled to approximately the same temperature as the molten metal and is introduced into the molten metal bath 13.

In the molten metal bath 13, the metal strip 2 is passed while immersed in the molten metal, and the molten metal adheres to the surface. Thereafter, the metal strip 2 drawn out from the molten metal bath 13 is wiped with excess molten metal by the gas ejected from the gas wiper 14, and the amount of adhesion of the molten metal is adjusted.

Thereafter, depending on the application, for example, when the metal strip 2 is used as an automobile outer plate, the alloy strip 15 is used to reheat the metal strip 2 using an alloying furnace 15 to produce a homogeneous alloy layer. May be applied.

Then, after passing through the cooling zone 16, the metal strip 2 is subjected to a special rust prevention and corrosion resistance treatment in the chemical conversion treatment section 17, wound around a coil, and shipped as a hot dipped metal strip 2A.

FIG. 9 is an enlarged view of the vicinity of the gas wiper 14 in the production line for the hot-dip metal strip (broken area in FIG. 8).

As shown in FIG. 9, in the vicinity of the gas wiper 14 in the production line for the hot-dip metal strip, the drawing roller 18 pulls the metal strip 2 into the molten metal bath 13, and the molten metal into the metal strip 2 in the molten metal bath 13. The pulling roller 19 pulls the metal strip 2 out of the molten metal bath 13. The gas wiper 14 is disposed in a pass line in the middle of the pulling roller 19 pulling up the metal band 2, and adjusts the amount of molten metal attached by wiping off excess molten metal adhering to the metal band 2.

The electromagnet 5 and the non-contact displacement sensor 3 of the metal strip stabilizer 1 according to the first embodiment of the present invention are arranged in a pass line immediately above the gas wiper 14, that is, the metal strip 2 is stabilized when the gas wiper 14 is wiped. It is arranged close to the gas wiper 14 within a common sense range (preferably within 2 m), and the warp and / or vibration of the metal band 2 is suppressed and the passing position of the metal band 2 is controlled. As a result of the arrangement, the distance between the gas wiper 14 and the metal strip 2 becomes constant, so that the pressure of the wiping gas becomes uniform, and unevenness in the amount of molten metal adhering to the metal strip 2 can be suppressed.

In addition, although Embodiment 2 of the present invention has been described by taking the production line of the hot-dip metal strip as an example, the control according to the present invention is applied to any production line that uses an electromagnet to control the position of the metal strip. Needless to say, you can.

Further, the plate direction of the metal strip 2 is not limited to the vertical direction but may be a horizontal direction.

As mentioned above, although this invention was demonstrated based on Embodiment 1, 2, this invention is not limited by description and drawing which make a part of indication of this invention by said Embodiment 1,2.

The present invention is useful for a line for producing a metal strip, and is particularly suitable for a production line for a hot dipped metal strip.

DESCRIPTION OF SYMBOLS 1 Metal strip stabilizer 2 Metal strip 2A Hot-dipped metal strip 3 Non-contact displacement sensor 4 Control unit 4A Control unit 4X Control unit 5 Electromagnet 6 Manipulation unit 7 Front / back distribution device 8 Amplifier 9 Input means 9a Joint position information input Means 10 Joint portion 11 Electromagnet selection device 12 Annealing furnace 13 Molten metal bath 14 Gas wiper 15 Alloying furnace 16 Cooling zone 17 Chemical conversion treatment section 18 Pull-in roller 19 Pull-up roller

Claims (3)

It is installed in a metal band production line that joins multiple metal bands and continuously passes through them, and the position of the metal band that is running in the line is contactless using an electromagnet arranged in the metal band width direction. A metal band stabilizer to control,
A displacement sensor for measuring the position of the metal strip in a non-contact manner;
An electromagnet selection device that performs electromagnet selection based on plate width information before and after the joint of the metal strip;
A joint position information input means for acquiring timing for performing electromagnet selection and instructing the electromagnet selection device;
An operation amount calculation device for determining a current to be passed through the selected electromagnet based on at least information on the displacement sensor and information on the selected electromagnet;
When the joint between metal strips passes, it is selectively used only from electromagnets arranged within a narrower range than the narrower plate width of the preceding metal strip and the trailing metal strip. Metal band stabilizer to control. An electromagnet selection device that performs electromagnet selection based on information on the plate width of the stationary portion of the metal strip and information on the minimum plate width of a series of metal strips that are passed through the production line;
When the joint between the metal strips passes, it is selectively used and controlled only from electromagnets arranged in a range narrower than the minimum plate width of a series of metal strips passed through the production line. 2. A metal band stabilizer according to 1. 2. An adhesion step for adhering molten metal to a metal strip in a sheet passing through a production line; and an adjustment step for adjusting an adhesion amount of the molten metal by a gas wiper for wiping off excess molten metal adhering to the metal strip; A method for producing a hot-dip metal strip, comprising the step of controlling the position and / or vibration of the metal strip in a non-contact manner by means of the metal strip stabilizer according to claim 2.

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