JP2011214146A - Electromagnetic vibration suppression device, and electromagnetic vibration suppression control program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic vibration suppression device which does not require a special edge position detection sensor and can appropriately suppress the vibration of not only a steel plate travelling in a normal posture but also a steel plate travelling while meandering in a width direction.SOLUTION: The electromagnetic vibration suppression device 1 includes: a plurality of electromagnet pairs 2 each of which is a set of electromagnets 2A, 2B opposed to each other in the thickness direction of the steel plate S travelling in the prescribed direction, being arranged side by side in the width direction of the steel plate S; and a control unit 4 which controls currents flowing through respective electromagnets 2A, 2B and, thereby, suppresses vibrations of the steel plate S travelling between the electromagnets 2A, 2B of the respective electromagnet pairs 2, wherein the control unit 4 includes: an edge position calculation unit 41 which calculates and determines the edge position Se of the steel plate S based on inputted width sizes of the steel plate S and meandering amounts of the steel plate S inputted in real time or every prescribed time; and a current amount control unit 42 which individually controls the amount of the current flowing through the electromagnets 2A, 2B based on the edge position Se of the steel plate S determined by the edge position calculation unit 41.

Description

  The present invention relates to an electromagnetic damping device capable of preventing / suppressing vibration of a steel plate being conveyed by a current output from an electromagnet, and an electromagnetic damping control program applicable to such an electromagnetic damping device. is there.

  Conventionally, for example, in a continuous hot dip galvanizing line, pressurized air or pressurized gas from an air knife part (for example, one configured using an air nozzle) to a steel plate that travels while being pulled up through a hot dip galvanizing tank. The excess molten zinc is blown off by jetting out to form a desired plating thickness. In such a case, if the steel plate vibrates in the direction in which it is in contact with or separated from the air knife part, the distance between the nozzle and the steel plate will change, and as a result, the pressure (injection force) received by the steel plate will change and the plating thickness will change. May become non-uniform, leading to quality degradation.

  In view of this, an electromagnetic damping device is conceived that controls the attraction force of the electromagnet to control the vibration of the traveling steel sheet by controlling the current flowing through the electromagnet arranged opposite to the position sandwiching the traveling steel sheet (for example, a patent) Reference 1). This type of electromagnetic damping device has a plurality of sets of displacement sensors that detect the relative position (distance) relative to a steel plate in association with each electromagnet in the width direction of the steel plate, and the steel plate detected by each displacement sensor. It is comprised so that the electric current sent through each electromagnet may be controlled based on a relative position (distance).

  By the way, a steel plate traveling between opposing electromagnets may meander in the width direction. And since the edge position (edge) of a steel plate changes before and after the meandering, control specifications for adjusting the output current of each electromagnet according to the change in the edge position are required.

  Therefore, in Patent Document 1, a sensor (edge position detection sensor) different from the displacement sensor is provided in the width direction of the steel plate at a position that can face the edge position of the steel plate so that the edge position of the running steel plate can always be detected. Are arranged at a predetermined pitch, and each edge position detection sensor determines whether or not a steel plate is present. When the presence of a steel plate is detected, the electromagnet associated with the edge position detection sensor is driven. In the case where the presence of a steel plate is not detected, a mode is disclosed in which driving of the electromagnet associated with the edge position detection sensor is stopped.

JP 2009-179834 A

  However, in the above-described aspect, in addition to the displacement sensor, a configuration in which a plurality of other sensors are arranged for the purpose of detecting the edge position is indispensable, and when meandering according to the type of steel plate (plate width, etc.) The position area of the edge position detection sensor must be set in consideration of the maximum swing width (meandering amount) of the steel sheet, and if this layout setting is inappropriate, stable vibration control can be performed on the steel sheet. Therefore, there is a problem that appropriate control becomes difficult. Further, when the number and arrangement density of the edge position detection sensors are increased in order to obtain a more accurate detection result, there is a problem that the structure is further complicated and the cost is increased. In addition, although the aspect which changes the attachment position of an edge position detection sensor according to the kind of steel plate can also be considered, replacement work is requested | required whenever the kind of steel plate changes, and work efficiency falls.

  The present invention has been made paying attention to such a problem, and the main purpose is not to make the sensor for detecting the edge position an essential structure, and the vibration of the steel plate traveling in a normal posture is Of course, it is an object to provide an electromagnetic damping device capable of appropriately suppressing vibration of a steel plate running meandering in the width direction.

  That is, according to the present invention, a plurality of electromagnet pairs, which are a set of electromagnets arranged opposite to each other in the thickness direction of a steel plate traveling in a predetermined direction, are arranged in the width direction of the steel plate, and each electromagnet pair is controlled by a control unit that controls a current flowing through each electromagnet. The present invention relates to an electromagnetic damping device that suppresses vibrations of a steel sheet that travels between electromagnets, and the control unit inputs the width dimension of the steel sheet and the displacement in the width direction of the steel sheet that is input in real time or every predetermined time. Edge position calculating means for calculating the edge position of the steel sheet based on the amount, and current amount control means for individually controlling the amount of current flowing through the electromagnet based on the edge position of the steel sheet determined by the edge position calculating means. It is characterized by that.

  Here, the output source that outputs the width dimension of the steel plate to the control unit, and the output source that outputs the displacement amount in the width direction of the steel plate, that is, the meandering amount to the control unit in real time or every predetermined time, respectively. It may be any device other than the electromagnetic vibration control device (for example, a host computer) or a part of the electromagnetic vibration control device (for example, a meandering amount detection device). In the electromagnetic damping device of the present invention, the conveying direction of the steel plate is not particularly limited, and the steel plate that passes between the electromagnets while being pulled up, the steel plate that is passed between the electromagnets while being pulled down, or a horizontal plate It may be a steel plate that passes between the electromagnets while moving to the steel plate, or a steel plate that is conveyed in any of these directions.

  If it is such an electromagnetic damping device, the edge position of the steel sheet is calculated by the edge position calculating means based on the width dimension of the steel sheet and the meandering amount of the steel sheet, Since the current flowing through each electromagnet is individually adjusted by the current amount control means based on the edge position, the steel plate and the width traveling in a normal posture without the need for a sensor for detecting the edge position. It is possible to appropriately suppress the vibration of the steel plate that runs meandering in the direction.

  In the electromagnetic damping device of the present invention, the current amount control means may control the output intensity of the current as “current amount control”. However, in the case of a simple control specification, the electromagnet is excited. It is possible to adopt a mode in which the amount of output current from each electromagnet is set to either zero or a predetermined value of zero or more by switching only between the state and the non-excited state (current on / off) preferable.

  In this case, as a preferred control mode by the current amount control means, among the electromagnets, the electromagnet existing on the center side in the width direction of the steel plate with respect to the edge position of the steel plate obtained by the edge position calculation means is in an excited state, and the others In this case, the electromagnet is set in a non-excited state.

  Further, in the control unit of the electromagnetic vibration damping device according to the present invention, the current control means specifies the electromagnet pair in which the edge position of the steel sheet obtained by the edge position calculation means exists between the electromagnets, and the specified electromagnet pair (edge The amount of current of the electromagnets constituting the edge position specifying electromagnet pair can be adjusted according to where the edge position exists in the position specifying electromagnet pair). As a specific control mode of the control unit, in the case of an electromagnet pair region in which a plurality of electromagnet pairs are arranged, the edge position in the edge position specifying electromagnet pair is set around the center in the width direction of the electromagnet constituting the electromagnet pair. If it is determined that the electromagnet pair region is located at the end in the width direction of the electromagnet pair region, the electromagnet constituting the edge position specifying electromagnet pair is energized, and the edge position is in the center of the electromagnet region in the width direction of the electromagnet pair region. For example, when it is determined that the electromagnet constituting the edge position specifying electromagnet pair is in the non-excited state, the current control signal is output.

  The electromagnetic damping control program of the present invention is a program applied to the electromagnetic damping device having the above-described configuration, and the inputted steel sheet width dimension and the displacement amount in the width direction of the steel sheet inputted in real time. An edge position calculating step for calculating the edge position of the steel sheet based on the edge position, and a current amount control step for individually controlling the amount of current flowing through the electromagnet based on the edge position of the steel sheet determined in the edge position calculating step It is characterized by. With such an electromagnetic vibration suppression control program, vibration during traveling can be suppressed even for a steel plate traveling meandering.

  According to the electromagnetic damping device of the present invention, it is possible to appropriately suppress the vibration of the steel plate traveling in a normal posture and to meander and travel without using a dedicated edge position detection sensor as an essential structure. The vibration of the steel plate can also be effectively suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS The whole structure schematic diagram of the electromagnetic damping device which concerns on one Embodiment of this invention. The a direction schematic arrow view of FIG. The functional block diagram of the control part in the electromagnetic damping device which concerns on the embodiment. The flowchart of the electromagnetic damping control program used for the electromagnetic damping device which concerns on the embodiment.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the electromagnetic damping device 1 according to the present embodiment is disposed downstream of the molten metal tank (in the embodiment, the molten zinc tank Z is applied) in the continuous plated steel plate line L, The vibration of the steel sheet S that travels while being pulled up through the zinc tank Z is suppressed. In addition, in FIG. 1, the state which looked at the steel plate S from the side is shown typically, and in FIG. 2, the a direction arrow view of FIG. 1 is shown typically.

  The continuous plated steel plate line L (particularly, the plated steel plate line using molten zinc is referred to as “continuous galvanizing line” (CGL)) is located between the molten zinc tank Z and the electromagnetic damping device 1. The air knife part A provided with the nozzle A1 with the jet port directed to the steel sheet S is provided, and the pressurized air or the pressurized air from the jet port of each nozzle A1 with respect to the steel plate S traveling while being pulled up through the molten zinc tank Z Excess molten zinc is blown off by jetting pressurized gas. As the molten zinc tank Z and the air knife part A, known ones can be applied, and detailed description thereof is omitted.

  As shown in FIGS. 1 and 2, the electromagnetic damping device 1 includes an electromagnet pair 2, which is a set of a first electromagnet 2 </ b> A and a second electromagnet 2 </ b> B, facing each other at a position where the steel plate S can be sandwiched in the thickness direction. A plurality of them are arranged at a predetermined pitch in the width direction. The first electromagnet 2A and the second electromagnet 2B constituting each electromagnet pair 2 are each composed of an iron core 21 having a U-shaped cross section or a substantially U-shaped cross section, and a coil 22 wound around each leg portion of the iron core 21. This is a known one that can be switched between an excitation state in which a magnetic attraction force can be output from the iron core 21 and a non-excitation state in which the magnetic attraction force is not output from the iron core 21 depending on whether or not power is supplied to the coil 22. In the present embodiment, as shown in FIG. 2, a plurality of electromagnet pairs 2 are arranged at a predetermined pitch in the width direction of the steel sheet S. In the following description, an area in which these electromagnet pairs 2 are arranged is defined. This is referred to as “electromagnet pair region 2X”.

  In addition, the electromagnetic damping device 1 is provided with a first sensor 3A and a second sensor 3B that detect the distance to the steel plate S on the surface of each first electromagnet 2A and each second electromagnet 2B that faces the steel plate S. Yes. In the present embodiment, for example, eddy current type sensors 3A and 3B are applied, and these sensors 3A and 3B are disposed in the recesses of the electromagnets 2A and 2B (positions that can be sandwiched between the legs of the iron core 21). The first sensor 3 </ b> A and the second sensor 3 </ b> B are set on the same or substantially the same surface as the magnetic pole surfaces of the corresponding electromagnets 2 </ b> A and 2 </ b> B. The first sensor 3A and the second sensor 3B detect the distances d1 and d2 to the steel plate S and output the detection results to the control unit 4 as detection signals. In the present embodiment, the sensors 3A and 3B are set so that the distance to the steel plate S can be detected only when the entire detection surfaces of the sensors 3A and 3B are completely or substantially completely covered by the steel plate S. .

  And the electromagnetic damping device 1 which concerns on this embodiment is electrically connected to the electromagnets 2A and 2B of each electromagnet pair 2, and the magnetic attraction | suction of each electromagnet 2A and 2B based on the electric current sent through these electromagnets 2A and 2B. A control unit 4 for controlling the force is provided. The control unit 4 is electrically connected to the sensors 3A and 3B, and the position information (vibration information of the steel sheet S) of the steel sheet S detected by the sensors 3A and 3B. The electromagnetic damping device 1 according to the present embodiment is the same as the known electromagnetic damping device in that the magnetic attraction force of each of the electromagnets 2A and 2B is controlled so as to suppress the vibration. Different from known electromagnetic damping devices.

  That is, as shown in FIG. 3, the control unit 4 in the electromagnetic vibration damping device 1 of the present embodiment has the inputted width dimension of the steel sheet S and the displacement amount in the width direction of the steel sheet S inputted in real time (meandering amount). ) To calculate the edge position Se of the steel sheet S based on the edge position Se, and individually determine the amount of current to flow through the electromagnets 2A and 2B based on the edge position Se of the steel sheet S calculated by the edge position calculation means 41. Current amount control means 42 for controlling.

  In the present embodiment, the information on the line L side from the host computer (not shown) electrically connected to the electromagnetic damping device 1, that is, the plate thickness, plate width, steel type, tension, etc., which are information related to the traveling steel plate S, It is configured to be input to the control unit 4. For example, the meandering amount (meandering amount information) of the steel sheet S based on the edge position Se of the steel sheet S detected by a device (not shown) such as an edge position detector electrically connected to the electromagnetic damping device 1 is the edge position. The system is configured to be input to the control unit 4 in real time from a system including devices such as detectors. It should be noted that the detection of the edge position by the edge position detection device and the input from the system including the device such as the edge position detector to the control unit can be performed at predetermined time intervals.

  The edge position calculation means 41 calculates and obtains the edge position Se of the steel sheet S traveling in the electromagnet pair region 2X based on the width dimension information of the steel sheet S and the meandering amount information of the steel sheet S. When the steel plate S travels in the electromagnet pair region 2X in a normal posture (hereinafter referred to as “normal posture”) without meandering, the center Sc in the width direction of the steel plate S is the electromagnet pair region as shown by the solid line in FIG. The edge position Se of the steel sheet S coincides with the width direction center 2Xc of 2X, and the width direction center Sc of the steel sheet S (= the center 2Xc in the width direction of the electromagnet pair region 2X) is half of the width dimension of the steel sheet S (2 minutes) It coincides with or substantially coincides with a position separated by a distance equal to 1). Here, when the width dimension of the steel sheet S is represented by “W”, the edge position Se of the steel sheet S conveyed in a normal posture can be represented by “½ W” with reference to the center 2Xc in the width direction of the electromagnet pair region 2X. it can.

  Then, the edge position calculation means 41 can perform an arithmetic process with the actual meandering amount being “α”, and can determine the edge position Se of the steel sheet S as “½W ± α”. In other words, as shown by the one-dot chain line in FIG. 2, the edge position calculation means 41 has the edge position Se of the steel sheet S input in real time a distance α more than the edge “1/2 W” of the steel sheet S conveyed in a normal posture. The edge position Se can be obtained as “½W + α” when the electromagnet pair 2 placement area is far from the center in the width direction, and the edge position Se of the steel sheet S input in real time is conveyed in a normal posture. The edge position Se can be obtained as “½ W−α” when the distance “α” is closer to the center in the width direction of the electromagnet pair 2 arrangement region than the edge “½ W” of the steel sheet S to be obtained.

  Based on the edge position “1 / 2W ± α” obtained by the edge position calculation means 41, the current amount control means 42 identifies the electromagnet pair 2 in which the edge position Se exists between the electromagnets 2A and 2B. The electromagnets 2A and 2B constituting the electromagnet pair 2 arranged on the side 2Xc in the width direction of the electromagnet pair region 2X than the electromagnet pair 2 (hereinafter referred to as "edge position specifying electromagnet pair 2 (T)") can be driven. In addition, the electromagnets 2A and 2B constituting the electromagnet pair 2 arranged on the side in the width direction end 2Xe of the electromagnet pair region 2X with respect to the edge position specifying electromagnet pair 2 (T) are not driven.

  Furthermore, the current amount control means 42 of the present embodiment determines that the edge position “1 / 2W ± α” is based on “1 / 2W ± α” which is the edge position Se of the steel sheet S obtained by the edge position calculation means 41. When the electromagnet pair 2 existing between the electromagnets 2A and 2B is specified, simultaneously or substantially simultaneously, the edge position Se in the edge position specifying electromagnet pair 2 (T) is the electromagnet 2A constituting the edge position specifying electromagnet pair 2 (T), It is determined whether or not it is closer to the width direction end 2Xe side of the electromagnet pair region 2X than the predetermined range 2a set around the width direction center 2c of 2B. When the current amount control means 42 determines that the edge position Se of the steel sheet S is located on the side of the end 2Xe in the width direction of the electromagnet pair region 2X with respect to the predetermined range 2a (of the steel sheet S indicated by the one-dot chain line in FIG. 2). At the edge position Se) on the right side of the paper, the electromagnets 2A and 2B constituting the edge position specifying electromagnet pair 2 (T) are in an excited state (On), while the edge position Se of the steel sheet S is more than the predetermined range 2a. When it is determined that the electromagnet pair region 2X is not on the width direction end 2Xe side (the edge position Se on the left side of the paper surface of the steel sheet S indicated by the one-dot chain line in FIG. 2), the edge position specifying electromagnet pair 2 (T) is configured. The electromagnets 2A and 2B are brought into a non-excited state (Off). Here, when the current amount control means 42 determines that the edge position Se of the steel sheet S is not closer to the width direction end 2Xe side of the electromagnet pair region 2X than the predetermined range 2a, the edge position Se of the steel sheet S is the predetermined position. When present in the range 2a (the edge position Se on the left side of the paper surface of the steel sheet S indicated by the one-dot chain line in FIG. 2), or the edge position Se of the steel sheet S is in the width direction of the electromagnet pair region 2X than the predetermined range 2a This is the case of being on the center 2Xc side (not shown). In this embodiment, in each electromagnet pair 2, the sensors 3A and 3B are arranged at the center 2c in the width direction of the electromagnets 2A and 2B, and the range corresponding to the width dimension of the sensors 3A and 3B is set to “predetermined range 2a”. ing. The size of the “predetermined range” set around the width direction center 2c of the electromagnets 2A and 2B constituting the edge position specifying electromagnet pair 2 (T) may be appropriately changed.

  Moreover, the control part 4 of this embodiment is the distance between the steel plate S detected by the sensors 3A and 3B and the electromagnets 2A and 2B, that is, vibration information of the steel plate S (whether or not the steel plate S is vibrating, vibration The amount of current flowing through the electromagnets 2A and 2B in the excited state is controlled so as to correct the warp of the steel sheet S based on the degree of vibration (vibration amount). It also suppresses it. Although not shown, the control unit 4 includes a controller to which output signals from the sensors 3A and 3B are input, a sequencer that outputs commands related to control gain to the controller, and the electromagnets 2A and 2B output by the controller. The controller includes a first amplifier and a second amplifier that supply current to each of the electromagnets 2A and 2B based on a command (current amount control information (current amount control signal)) relating to a current to be passed. Detailed description of each amplifier is omitted.

  Next, the usage method and operation of the electromagnetic damping device 1 having such a configuration will be described.

  First, when the electromagnetic damping device 1 is activated, as shown in FIG. 1, the steel plate S traveling between the first electromagnet 2A and the second electromagnet 2B while being pulled up through the molten zinc tank Z, At least the width dimension information of the steel sheet S and the real-time meandering amount information of the steel sheet S are input to the control unit 4. Then, the electromagnetic vibration suppression control program according to this embodiment is executed to operate each unit as follows. That is, the control unit 4 calculates the edge position Se of the steel sheet S by the edge position calculating means 41 based on the width dimension information of the steel sheet S and the meandering amount information of the steel sheet S (edge position calculating step S1; see FIG. 4). ). Next, the control unit 4 flows the electromagnets 2A and 2B based on “1 / 2W ± α” that is the edge position Se of the steel sheet S calculated by the edge position calculation means 41 through the edge position calculation step S1. The current amount (whether at least the electromagnets 2A and 2B of each electromagnet pair 2 are in an excited state) is individually controlled (current amount control step S2; see FIG. 4). Specifically, the electromagnet pair 2 in which the edge position Se of the steel sheet S obtained by the edge position calculating means 41 exists between the electromagnets 2A and 2B is specified. And in this specified electromagnet pair 2 (edge position specifying electromagnet pair 2 (T)), the edge position Se of the steel plate S is the width direction center 2c of the electromagnets 2A and 2B constituting the edge position specifying electromagnet pair 2 (T). It is determined whether or not the electromagnet pair region 2X is present on the width direction end 2Xe side of the predetermined range 2a as the center. When it is determined that the edge position Se of the steel sheet S is present on the width direction end 2Xe side of the electromagnet pair region 2X with respect to the predetermined range 2a, the electromagnets 2A and 2B constituting the edge position specifying electromagnet pair 2 (T) are excited. Current amount control information (where “current amount control information” corresponds to the “current amount control signal” of the present invention) is output to the electromagnets 2A and 2B. On the other hand, when it is determined that the edge position Se of the steel sheet S does not exist on the side of the width direction end 2Xe of the electromagnet pair region 2X with respect to the predetermined range 2a, the electromagnets 2A and 2B constituting the edge position specifying electromagnet pair 2 (T). Is output to the electromagnets 2A and 2B. In addition, the current amount control means 42 is configured such that one edge position Se of the steel sheet S is specified between the electromagnets 2A and 2B, and the other edge position Se of the steel sheet S exists between the electromagnets 2A and 2B. Then, current amount control information for setting the electromagnets 2A and 2B constituting the plurality of electromagnet pairs 2 arranged between the specified electromagnet pair 2 to an excited state is output to the electromagnets 2A and 2B. With the above procedure, the On / Off control of the electromagnets 2A and 2B can be performed without requiring a sensor for detecting the edge position Se of the steel sheet S.

  Further, in the electromagnetic vibration damping device 1 of the present embodiment, the vehicle travels between the first electromagnet 2A and the second electromagnet 2B in an excited state based on the current amount control information while being pulled up through the molten zinc tank Z. The distance between the first sensor 3A and the second sensor 3B associated with the electromagnets 2A and 2B is the distance to the steel plate S, that is, the position in the thickness direction of the steel plate S (vibration information of the steel plate S). Are detected in real time, and each detection information (vibration information of the steel sheet S) is output to the control unit 4. Based on the detection information (vibration information of the steel plate S), the control unit 4 provides current amount control information regarding the amount of current flowing through each of the first electromagnets 2A and the second electromagnets 2B in the excited state. Output to 2B. As described above, in the present embodiment, the position information in the thickness direction of the steel sheet S, that is, only the vibration information of the steel sheet S is detected by the sensors 3A and 3B, and the control unit 4 detects each of the electromagnets 2A and 2B based on this vibration information. It is configured to control the amount of current to flow. The amount of current flowing through the first electromagnet 2A and the second electromagnet 2B is controlled based on the current amount control information relating to the magnitude of the amount of current output from the control unit 4, and as a result, the steel sheet S is made of each electromagnet 2A, 2B. It is guided by the magnetic attraction force so as to approach an intermediate position between the first electromagnet 2A and the second electromagnet 2B, and vibration during traveling is suppressed.

  Therefore, the distance between the steel plate S traveling while being pulled up through the molten zinc tank Z and the spout at each nozzle A1 constituting the air knife part A can be maintained within a certain range. It is possible to prevent fluctuations in the injection force to be achieved, and to achieve a uniform or almost uniform plating thickness.

  Thus, in the electromagnetic damping device 1 according to the present embodiment, the edge position Se of the steel sheet S is calculated based on the input width dimension of the steel sheet S and the displacement amount in the width direction of the steel sheet S input in real time. The edge position calculating means 41 obtained by the above and the current for individually controlling the electromagnets 2A and 2B to the excited state (On) or the non-excited state (Off) based on the edge position Se of the steel sheet S obtained by the edge position calculating means 41. Since the control unit 4 including the quantity control means 42 is used, the edge position Se is detected separately from the sensors 3A and 3B that detect the position information in the thickness direction of the steel sheet S (vibration information of the steel sheet S). There is no need to arrange sensors or to use the sensors 3A and 3B that detect position information in the thickness direction of the steel sheet S (vibration information of the steel sheet S) as sensors for detecting the edge position Se. Based on the edge position information of the steel sheet S obtained by the position calculating means 41, it is possible to appropriately and reliably control whether or not each electromagnet 2A, 2B is in an excited state, and the steel sheet S traveling in a normal posture and the width direction Therefore, the vibration of the steel sheet S meandering can be effectively suppressed, and the practicality is excellent. Therefore, when such an electromagnetic damping device 1 is disposed in the continuous plated steel plate line L together with the air knife part A that blows off the excess molten metal adhering to the steel plate S, the electromagnetic damping device 1 Vibration during running can be effectively suppressed in the posture, and as a result, the distance between the steel plate S and the air knife part A can be maintained within a certain range, and the injection force acting on the steel plate S can be reduced. Variations can be prevented and a uniform or nearly uniform plating thickness can be achieved.

  Further, the electromagnetic damping program according to the present embodiment calculates the edge position obtained by calculating the edge position Se of the steel sheet S based on the input width dimension of the steel sheet S and the meandering amount of the steel sheet S input in real time. In order to go through step S1 and the current amount control step S2 for individually controlling whether or not the electromagnets 2A and 2B are in an excited state based on the edge position Se of the steel sheet S obtained in the edge position calculation step S1, the above-mentioned is described. As a result, vibrations of the steel sheet S traveling in a normal posture and the steel sheet S traveling meandering in the width direction can be appropriately suppressed.

  In addition, this invention is not limited to embodiment mentioned above. For example, an output source that outputs the width dimension of the steel plate to the control unit, or an output source that outputs the meandering amount of the steel plate to the control unit in real time is a device different from the electromagnetic vibration control device or electromagnetic vibration control, respectively. It may be any part of the apparatus.

  In addition to the current output on / off state (whether the electromagnet is in the excited state or the non-excited state), or in place of the current output on / off, the current amount control means outputs the output intensity (the amount of current flowing through the electromagnet). The amount of current of the electromagnet may be controlled by adjusting the size of the electromagnet. In particular, when the current amount control means does not control on / off switching of the current output, but adjusts the output intensity without turning off the current output (making the electromagnet unexcited) Instead of the current output OFF state (non-excitation state of the electromagnet) in the first embodiment described above, even if the steel plate between the electromagnet pair is not moved or moved in the width direction depending on the magnetic attraction force of the electromagnet It is desirable to flow a weak current that can move only a negligible minimum distance. If such current control is performed, a weak current is always output even in a state where the steel plate is not moved in the width direction as compared to the case of the first embodiment in which on / off control of current output is performed. Responsiveness when raising the current output so as to move in the width direction by the desired distance is improved, and the vibration damping control efficiency of the steel sheet can be increased.

  The number of electromagnet pairs and the pitch between electromagnet pairs adjacent in the width direction can be appropriately changed. Further, the width dimension of the electromagnet pair region may be appropriately changed according to the change in the number of electromagnet pairs and the pitch between the electromagnet pairs.

  Moreover, you may be an electromagnetic damping device which does not provide the sensor corresponding to each electromagnet. In this case, a sensorless electromagnetic damping device is obtained.

  Moreover, although the molten zinc tank was illustrated as a molten metal tank in embodiment mentioned above, it may replace with this, for example, you may apply the tank which stored the molten tin, aluminum, or resin paint. In the electromagnetic damping device of the present invention, as the surface coating treatment for the steel sheet, in addition to the plating coating treatment, other surface treatment such as surface coloring treatment for applying a surface coating treatment by spraying an appropriate surface treatment material onto the steel sheet. A coating process can be employed.

  Still further, the electromagnetic damping device of the present invention is a device that suppresses and controls the vibration of a steel plate that passes between the electromagnets while being pulled down after the surface coating treatment, or is horizontal after the surface coating treatment. It may be a device that suppresses and controls the vibration of the steel plate that is passed between the electromagnets while being moved. Further, in the above-described embodiment, the case where the posture of the steel plate passing between the electromagnets is vertical is shown. However, in the present invention, the steel plate passes between the electromagnets in any posture other than vertical, for example, a horizontal posture or an inclined posture. It can also be done.

  In addition, the specific configuration of each part is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Electromagnetic damping device 2 ... Electromagnet pair 2A, 2B ... Electromagnet 4 ... Control part 41 ... Edge position calculation means 42 ... Current amount control means S ... Steel plate

Claims (5)

A plurality of electromagnet pairs, which are a set of electromagnets arranged opposite to each other in the thickness direction of a steel plate that runs in a predetermined direction, are arranged in the width direction of the steel plate, and run between the electromagnets of the electromagnet pairs by a control unit that controls the current flowing through each electromagnet. An electromagnetic damping device that suppresses vibration of a steel sheet
The control unit is
Edge position calculating means for calculating and obtaining the edge position of the steel sheet based on the input width dimension of the steel sheet and the displacement in the width direction of the steel sheet input in real time or every predetermined time;
An electromagnetic damping device, comprising: current amount control means for individually controlling the amount of current flowing through the electromagnet based on the edge position of the steel sheet obtained by the edge position calculating means. The electromagnetic damping device according to claim 1, wherein the current amount control means outputs a current control signal for setting each electromagnet to an excited state or a non-excited state. The current amount control means sets the electromagnet existing in the width direction center side of the steel sheet from the edge position of the steel sheet obtained by the edge position calculation means among the electromagnets to the excited state, and other electromagnets to the non-excited state. The electromagnetic damping device according to claim 2, wherein the current control signal is output. The current control means specifies an electromagnet pair in which the edge position of the steel sheet obtained by the edge position calculation means exists between electromagnets, and in the specified electromagnet pair, the edge position is the width of the electromagnet constituting the electromagnet pair. The electromagnet constituting the specified electromagnet pair is in an excited state when it is determined that the electromagnet pair region in which the plurality of electromagnet pairs are arranged is located in the width direction end side than a predetermined range set around the center in the direction, A current control signal for outputting an electromagnet that constitutes the specified electromagnet pair in a non-excited state when the edge position is determined to be closer to the center in the width direction of the electromagnetic pair region than the predetermined range. 3. The electromagnetic damping device according to 3. An electromagnetic damping control program applied to the electromagnetic damping device according to any one of claims 1 to 4,
An edge position calculating step for calculating the edge position of the steel sheet based on the width dimension of the steel sheet input and the displacement amount in the width direction of the steel sheet input in real time or every predetermined time; and
An electromagnetic vibration suppression control program comprising: a current amount control step for individually controlling a current amount flowing through the electromagnet based on the edge position of the steel plate obtained in the edge position calculating step.

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