JP5000458B2 - Gas wiping device - Google Patents

Description

  The present invention relates to a gas wiping apparatus that removes excess molten metal adhering to the surface of a steel strip that is continuously transported by spraying a wiping gas and controls the steel strip to a predetermined plating adhesion amount. About.

  Hot metal plating methods such as zinc and aluminum have been put into practical use for a long time. In particular, the demand for molten metal-plated steel sheets plated with these molten metals is increasing as rust-proof steel sheets for automobiles, home appliances, and building materials. As the quality of final products such as automobiles, home appliances, and building materials is improved, higher quality products such as uniform plating coverage and suppression of surface defects are required for the hot-dip plated steel sheets that make up these products. ing.

  Currently, for example, a gas wiping method is generally used as a method for plating molten metal on a continuous steel strip (strip). In this gas wiping method, a steel strip continuously immersed in a molten metal plating bath is pulled upward from the plating bath, and a wiping gas is blown from the wiping nozzle to the steel strip in the ascending process. Yes. Thereby, the excessive molten metal adhering to the surface of the steel strip is removed, and the steel strip is adjusted to a predetermined plating adhesion amount. Such a conventional gas wiping apparatus is disclosed in Patent Document 1, for example.

Japanese Patent No. 3533775

  Here, depending on various conditions such as line tension and restraint force by various support rolls, the band steel may be meandered or twisted. However, in the conventional gas wiping apparatus, since the wiping gas is simply blown against the strip steel in which such meandering and twisting occurs, the plating adhesion amount in the width direction in the strip steel cannot be made uniform. There is a fear.

  Therefore, the present invention solves the above-described problem, and an object thereof is to provide a gas wiping apparatus that can make the amount of plating adhered to the strip in the width direction uniform even when meandering or twisting occurs. To do.

A gas wiping apparatus according to the present invention that solves the above problems is as follows.
By blowing wiping gas from the wiping nozzle to the strip that is continuously pulled up from the molten metal plating bath, the excess molten metal adhering to the surface of the strip is removed, and the strip is brought to a predetermined plating adhesion amount. A gas wiping device to control,
Tracking means for moving the wiping nozzle in the width direction of the band plate so that the width direction center position of the wiping nozzle follows the width direction center position of the band plate with respect to the band plate ;
The following means has a rotating means for rotating the wiping nozzle according to a twist angle of a strip,
The rotation axis of the wiping nozzle is disposed at a center position in the width direction of the wiping nozzle .

A gas wiping apparatus according to the present invention that solves the above problems is as follows.
It is provided with a correction damping means for suppressing the plate shape and vibration of the band plate by applying a suction force according to the distance to the band plate to the band plate,
The following means moves the correction vibration damping means in the width direction of the band plate so that the width direction center position of the correction vibration damping means follows the width direction center position of the band plate with respect to the band plate ,
The rotating means rotates the straightening damping means around the rotation axis in accordance with a twist angle of the strip .

  Therefore, according to the gas wiping device of the present invention, the wiping nozzle is moved in the width direction of the strip so that the center position in the width direction of the wiping nozzle follows the center position in the width direction of the strip. Thus, even if meandering or twisting occurs, the plating adhesion amount in the width direction on the strip can be made uniform.

  Hereinafter, a gas wiping apparatus according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic view of a molten metal plating facility equipped with a gas wiping apparatus according to an embodiment of the present invention, FIG. 2 is a front view of the gas wiping apparatus according to an embodiment of the present invention, and FIG. 4 is a rear view of the gas wiping apparatus according to the embodiment, FIG. 4 is a sectional view taken along arrow AA in FIG. 2, FIG. 5 is a sectional view taken along arrow BB in FIG. 2, and FIG. FIG. 7 is a cross-sectional view taken along the line DD in FIG. 3, FIG. 8 is a view showing the gap amount of the slit in the wiping nozzle, and FIG. 9 is a view of the gas wiping device when no meandering occurs in the strip steel. FIG. 10 is a diagram showing the operation, FIG. 10 is a diagram showing the operation of the gas wiping device when the strip steel is meandering to the operation side, and FIG. 11 is the gas wiping when the strip steel is meandering to the drive side Fig. 12 shows the operation of the device. Fig. 12 shows the gas wiping when the steel strip is not twisted. FIG. 13 is a diagram illustrating the operation of the gas wiping device when twisting occurs in the strip steel, and FIG. 14 is a diagram illustrating the operation of the gas wiping device when twisting occurs in the strip steel. FIG.

  A molten metal plating facility 1 shown in FIG. 1 is provided in a molten metal plated steel plate production line (not shown) for manufacturing a molten metal plated steel plate, and is for a continuously conveyed steel strip (band plate) S. For example, a molten metal such as zinc or aluminum is plated.

  As shown in FIG. 1, a plating bath 11 for storing molten metal held at a high temperature is disposed below the molten metal plating facility 1. In the plating bath 11, a sink roll 12 that wraps the immersed steel strip S and changes the direction substantially vertically upward, and a pair of supports arranged so as to sandwich the steel strip S conveyed from the sink roll 12. Rolls 13 and 14 are rotatably supported. The support rolls 13 and 14 are movable in the horizontal direction and the vertical direction. By adjusting these positions, the pressing force against the steel strip S is adjusted, and the warp (plate shape) is corrected.

  A gas wiping device 15 is provided on the bath surface of the plating bath 11. The gas wiping device 15 is composed of a pair of main bodies 15a and 15b disposed so as to be sandwiched with respect to the steel strip S from the plate thickness direction. For the steel strip S to which the molten metal adheres, for example, By blowing a wiping gas made of air, nitrogen or the like, excess molten metal adhering to the surface is removed, and the steel strip S is adjusted to a predetermined plating adhesion amount.

  Above the gas wiping device 15, a deflector roll 16 that is wound around a plated steel strip S and changes the direction in a substantially horizontal direction is rotatably supported. A plating adhesion amount detection sensor 17 that detects the plating adhesion amount of the steel strip S is provided above the deflector roll 16 so as to be movable in the width direction of the steel strip S.

  Next, the configuration of the gas wiping device 15 will be described with reference to FIGS. The main bodies 15a and 15b of the gas wiping device 15 have the same configuration, and the members constituting the main bodies 15a and 15b are arranged so as to be symmetric with respect to the steel strip S. Moreover, in the main body 15a, 15b, in the plate | board thickness direction of the strip steel S, while the side facing the strip S is made into the front side, the other side is made into the rear surface side, and in the width direction of the strip S, one side is made. The operation side is the drive side.

  As shown in FIGS. 2 to 7, a main frame 31 extending in the horizontal direction is installed on the upper portions of the main bodies 15 a and 15 b of the gas wiping device 15 so as to be movable in the conveying direction of the steel strip S. A rod support portion 32 is formed on the main frame 31, and a guide rod 33 extending in the thickness direction of the steel strip S is supported in the rod support portion 32. A hanger 34 is slidably supported on the guide rod 33.

  A movable casing 41 having a rectangular frame shape is disposed below the main frame 31, and a stay 42 is disposed in the frame of the movable casing 41. A guide rail 43 extending in the width direction of the steel strip S is provided on the lower surface of the upper member 41 a of the movable casing 41, and a sliding member 44 is provided on the upper surface of the end portion 42 a of the stay 42. . The guide rail 43 and the sliding member 44 are slidably engaged. Further, the lower end of the hanger 34 is formed in a bifurcated shape so as to straddle the upper member 41 a of the movable casing 41, and is supported on the upper surface of the end portion 42 a of the stay 42.

  Further, a motor 91 is provided on the upper surface of the lower member 41 b of the movable casing 41, and the output shaft of the motor 91 is connected to the cam shaft 93 via a coupling 92. The cam shaft 93 is supported on the upper surface of the lower member 41b via a bearing 94, and has a cam 95 that is eccentric with respect to the axis. Two plate-shaped side guides 42b are provided below the end portion 42a of the drive side stay 42, and a cam 95 is provided between the inner walls of the side guides 42b. It is slidable in the direction.

  The movable casing 41 and the stay 42 are provided with a columnar pivot 45 extending in the conveying direction of the steel strip S. The pivot 45 is disposed so as to penetrate the stay 42, and an upper end and a lower end thereof are fitted to the upper member 41 a and the lower member 41 b of the movable casing 41. The axis of the pivot 45 (rotational axis Op described later) is disposed at the center position in the width direction (longitudinal direction) of the movable casing 41 and the stay 42 (main bodies 15a and 15b of the gas wiping device 15).

  A rack 47 extending in the width direction of the steel strip S is supported on the stay 42 via a rack guide 46. The rack 47 is supported by the rack guide 46 so as to be slidable in the axial direction, and is fitted in the axial center position of the pivot 45. A pinion 48 connected to a driving device (not shown) is disposed in the frame of the movable casing 41, and the gear portion of the pinion 48 meshes with the gear portion of the rack 47.

  Below the movable casing 41, a wiping nozzle 51 for blowing wiping gas to the steel strip S to be conveyed is provided. The central position of the wiping nozzle 51 in the width direction (longitudinal direction) is arranged at the same position as the axis of the pivot 45 in the width direction of the steel strip S.

  A slit 51b is formed at the tip of the wiping nozzle 51 so as to be orthogonal to the transport direction of the steel strip S. The slit 51b communicates with a chamber 51a formed in the wiping nozzle 51. A pipe member 52 communicating with the chamber 51 a is connected to both sides of the wiping nozzle 51, and the pipe member 52 is supported on the lower surface of the lower member 41 b of the movable casing 41 via a pipe support member 53. . Further, a wiping gas supply device 55 is connected to the driving side pipe member 52 via a hose 54.

  The wiping gas supply device 55 supplies the wiping gas to the chamber 51a of the wiping nozzle 51 and injects the wiping gas from the slit 51b. At this time, the gas amount and the gas pressure of the wiping gas to be injected are controlled by the wiping gas supply device 55.

  The wiping nozzle 51 includes a gap amount control device 56 that controls the gap amount of the slit 51b. As shown in FIG. 8, the opening of the slit 51b of the wiping nozzle 51 is formed by a gap in the center portion in the width direction and a gap in the outer portion in the width direction. The gap amount in the central portion in the width direction of the slit 51b is constant. On the other hand, the gap amount is controlled by the gap amount control device 56 so that the gap at the outer portion in the width direction of the slit 51b is always larger than the gap amount at the central portion in the width direction.

  That is, by making the gap amount of the width direction outer side part of the slit 51b facing the width direction both sides of the steel strip S, that is, the edge part larger than the gap amount of the width direction center part, the edge of the band steel S The wiping gas injection amount to the part is increased. Thereby, the phenomenon called edge overcoat which an excess molten metal adheres to the edge part of the strip S is suppressed.

  A vibration damping device (corrective vibration damping means) 61 is provided on the front surface of the movable casing 41. The center position in the width direction (longitudinal direction) of the vibration damping device 61 is arranged at the same position as the axis of the pivot 45 in the width direction of the steel strip S.

  The opposing vibration damping device 61 is provided with a pair of plate shape detection sensors 62 and an electromagnet 63 which are disposed so as to be sandwiched with respect to the steel strip S from the plate thickness direction at predetermined intervals in the width direction of the steel strip S. ing. The electromagnet 63 is arranged in the upper and lower stages according to the width of the steel strip S, and the plate shape detection sensor 62 is arranged in the center between the upper and lower electromagnets 63. The plate shape detection sensor 62 and the electromagnet The tip of 63 is arranged at the same position as the tip of the wiping nozzle 51 (slit 51b) in the thickness direction of the steel strip S. In other words, seven sets of plate shape detection sensors 62 and two electromagnets 63 arranged above and below are arranged at predetermined intervals in the width direction of the steel strip S, and each set is described later. Control is performed.

  The plate shape detection sensor 62 is an eddy current sensor and detects the distance from the plate shape detection sensor 62 to the steel strip S. The electromagnet 63 corrects the warp of the steel strip S by the electromagnetic force and also controls the vibration of the steel strip S. As will be described in detail later, while each plate shape detection sensor 62 constantly detects the distance to the steel strip S, an excitation current is supplied to each electromagnet 63 according to the detected distance, and the electromagnetic force causes the belt to The warp of the steel S and the pass position of the steel strip S between the wiping nozzles 51 are corrected, and the steel strip S is damped.

  In the width direction of the steel strip S, a meandering amount detection sensor 71 is provided on the upper portion of the main frame 31 on the main body 15a side so as to face the edge portion according to the plate width of the steel strip S. The meandering amount detection sensor 71 is composed of a sensor using a two-dimensional scanning laser, a camera, an image processing device or the like, and the position of the edge portion in the width direction of the steel strip S and the meandering amount detection. The distance from the sensor 71 to the edge portion of the steel strip S is detected.

  A pair of baffle plates 81 are provided between the opposing wiping nozzles 51 so as to be opposed to the steel strip S from the width direction. The baffle plate 81 is supported so as to be movable in the width direction and the plate thickness direction of the steel strip S, and follows the steel strip S so that its tip faces the end surface of the steel strip S being conveyed. It has become. Thereby, the collision of the wiping gas injected from the slit 51b of the wiping nozzle 51 which opposes is prevented, and the edge overcoat in the edge part of the strip S is suppressed.

  The movable casing 41, the stay 42, the guide rail 43, the sliding member 44, the pivot 45, the rack 47, the pinion 48, the motor 91, the cam 95, and the like constitute the following means. The side guide 42b, the pivot 45, the motor 91, the coupling 92, the cam shaft 93, the bearing 94, the cam 95, and the like constitute rotating means.

  Therefore, the movable casing 41 and the stay 42 can be moved in the thickness direction of the steel strip S with respect to the main frame 31 by moving the hanger 34 on the guide rod 33 with the same movement amount. Thereby, the wiping nozzle 51 and the vibration damping device 61 which oppose can be moved with respect to the steel strip S so that it may approach and separate in the plate | board thickness direction.

  Further, the motor 91 is rotated forward or backward to rotate the cam 95, and the cam surface of the eccentric cam 95 is pressed against the inner wall of the side guide 42b of the stay 42, whereby the movable casing 41 is moved against the stay 42. The pivot 45 can be rotated in a plane orthogonal to the transport direction of the steel strip S. Thereby, the wiping nozzle 51 and the damping device 61 which oppose can be rotated with respect to the steel strip S in the plane. At this time, the movable casing 41 rotates with respect to the stay 42 supported by the hanger 34, but the end portion of the stay 42 is such that the bifurcated lower end of the hanger 34 straddles the upper member 41 a of the casing 41. Since it is supported by 42a, the rotation of the movable casing 41 is allowed.

  Furthermore, the movable casing 41 can be moved in the width direction of the steel strip S with respect to the stay 42 by rotating the pinion 48 forward or backward to engage and move the rack 47. Thereby, the wiping nozzle 51 and the damping device 61 which oppose can be moved with respect to the steel strip S in the width direction. At this time, since the guide rail 43 of the movable casing 41 and the sliding member 44 of the stay 42 are slidably engaged, the movable casing 41 moves smoothly.

  Therefore, by making the above-described configuration, the steel strip S continuously immersed in the plating bath 11 is turned substantially vertically upward by the sink roll 12 and is passed through the support rolls 13 and 14 to the plating bath. 11 is pulled up above the bath surface. At this time, the distance to each site | part of the corresponding steel strip S is always detected by each plate shape detection sensor 62, and according to this distance, the support rolls 13 and 14 move in the horizontal direction and the vertical direction, The warp of the steel S is corrected.

  Next, when the pulled steel strip S is conveyed between the main bodies 15 a and 15 b of the gas wiping device 15, wiping gas is blown against the steel strip S from the slit 51 b of the wiping nozzle 51. Thereby, the molten metal excessively attached to the surface of the steel strip S is scraped off, and the surface of the steel strip S is plated with a predetermined amount of film thickness.

  At the time of gas wiping described above, the main frame 31 is movable in the vertical direction, and the entire gas wiping device 15 is disposed at a predetermined height.

  At this time, in the wiping nozzle 51, the wiping gas supplied from the slit 51b is adjusted to a predetermined gas amount and gas pressure by the wiping gas supply device 55. At the same time, in the slit 51b, the gap amount is controlled by the gap amount control device 56 so that the gap of the outer portion in the width direction faces the edge portion of the steel strip S according to the plate width of the steel strip S. Adjusted.

  In the vibration damping device 61, the distance to each part of the corresponding steel strip S is always detected by each plate shape detection sensor 62, and the detected distance to each part of the steel strip S is set as a control target value. Compare. And the exciting current of each electromagnet 63 is adjusted so that each distance reaches the control target value, and the strip steel S is predetermined so that the plating adhesion amount in the width direction on the strip S is uniform by the electromagnetic force. The amount of warpage and the pass position are corrected, and the vibration of the steel strip S is suppressed.

  Furthermore, the distance to each part of the steel strip S detected by the plate shape detection sensor 62, the position of the edge portion in the width direction of the steel strip S detected by the meandering amount detection sensor 71, and the edge portion The meandering amount and twist angle of the steel strip S are constantly measured based on the distance. The wiping nozzle 51, the vibration damping device 61, and the baffle plate 81 follow the band steel S in accordance with the meandering amount and twist angle of the band steel S.

  Next, when the steel strip S to which the molten metal is plated is changed in the direction of the horizontal direction by the deflector roll 16 and conveyed, the coating amount detection sensor 17 detects the amount of plating in the width direction of the steel strip S. Is done. Here, when the detected plating adhesion amount is not the predetermined plating adhesion amount, the amount and gas pressure of the wiping gas by the wiping gas supply device 55 and the slit of the wiping nozzle 51 by the gap amount control device 56 are detected. The gap amount 51b is readjusted so that the plating adhesion amount in the width direction of the steel strip S is corrected to be within a predetermined range.

  Next, the operation of the gas wiping device 15 when the strip S is meandering and twisting will be described with reference to FIGS. 9 to 14.

  First, FIGS. 9 to 11 show the operation of the gas wiping device 15 when the steel strip S meanders.

  Here, the center position in the width direction of the steel strip S in the gas wiping device 15 is the transport center position of the steel strip S. When the transport center position is indicated as Ow and the center position in the width direction of the steel strip S is indicated as Os, the belt S that is not meandering normally has the center Os at the same position as the transport center Ow in the width direction. It is conveyed to become. On the other hand, the meandering steel strip S is transported with the center Os shifted from the transport center Ow in the width direction, and this shift amount becomes the meandering amount.

As shown in FIG. 9, when the meandering amount is measured to be 0, the pivot 45 of the movable casing 41 is moved via the rack 47 by rotating the pinion 48. As a result, the pivot 45 follows the strip S so that the rotation axis Op is at the same position as the center Os in the width direction of the strip S, so that the wiping nozzle 51 and the control of the movable casing 41 are controlled. The vibration device 61 is disposed so as to hold the steel strip S at the center in the width direction of the steel strip S. At the same time, the baffle plate 81 follows the steel strip S.

As shown in FIG. 10, when the meandering amount X to the operation side is measured, the pinion 48 is rotated to drive the pivot 45 of the movable casing 41 to the operation side via the rack 47. Move by the same distance as. As a result, the pivot 45 follows the strip S so that the rotation axis Op is at the same position as the center Os in the width direction of the strip S, so that the movable casing 41 moved to the operating side can be moved. The wiping nozzle 51 and the vibration damping device 61 are arranged so as to hold the steel strip S at the center in the width direction of the steel strip S. At the same time, the baffle plate 81 also follows the steel strip S according to the meandering amount X to the operation side.

As shown in FIG. 11, when the meandering amount X to the drive side is measured, the pivot 45 of the movable casing 41 is driven to the drive side via the rack 47 by rotating the pinion 48. Move by the same distance as. As a result, the pivot 45 follows the strip S so that the rotation axis Op is in the same position as the center Os in the width direction of the strip S, so that the movable casing 41 moved to the drive side The wiping nozzle 51 and the vibration damping device 61 are arranged so as to hold the steel strip S at the center in the width direction of the steel strip S. At the same time, the baffle plate 81 also follows the band steel S in accordance with the meandering amount X toward the drive side.

  Next, FIGS. 12 to 14 show the operation of the gas wiping device 15 when the steel strip S is twisted. It is assumed that the steel strip S shown in FIGS. 12 to 14 does not meander.

As shown in FIG. 12, when the twist angle is measured as 0 degree, the motor 91 is driven to rotate the cam 95 so that the cam surface of the eccentric cam 95 is brought into contact with the side guide 42 b of the stay 42. Press against the inner wall. As a result, the movable casing 41 rotates with respect to the stay 42 in a plane perpendicular to the conveying direction of the steel strip S around the pivot 45, so that the wiping nozzle 51 and the vibration damping device 61 that face each other are also used. With respect to S, it will rotate in that plane. As a result, the pivot 45 follows the steel strip S so that the rotation axis Op is at the same position as the center Os in the width direction of the steel strip S. The vibration device 61 is disposed so as to hold the steel strip S at the center in the width direction of the steel strip S. At the same time, the baffle plate 81 follows the steel strip S.

  As shown in FIG. 13, when the twist angle θ is measured such that the driving-side edge portion of the steel strip S rotates toward the main body 15a, the following operation is performed.

  In the main body 15a, the motor 91 is driven to rotate the cam 95, whereby the eccentric cam surface of the cam 95 is pressed against the inner wall of the rear side guide 42b. Accordingly, the movable casing 41 is rotated with respect to the stay 42 in a plane perpendicular to the conveying direction of the steel strip S around the pivot 45, and the opposing wiping nozzle 51 and the vibration damping device 61 are moved with respect to the steel strip S. In the plane, it is rotated by the twist angle θ. At the same time, by rotating the pinion 48, the pivot 45 is moved to the operation side.

  On the other hand, in the main body 15b, the motor 91 is driven to rotate the cam 95, thereby pressing the cam surface of the eccentric cam 95 against the inner wall of the side guide 42b on the inner surface side. Accordingly, the movable casing 41 is rotated with respect to the stay 42 in a plane perpendicular to the conveying direction of the steel strip S around the pivot 45, and the opposing wiping nozzle 51 and the vibration damping device 61 are moved with respect to the steel strip S. , Rotate in that plane. At the same time, the pivot 45 is driven to rotate, thereby moving the pivot 45 to the drive side.

As a result, the pivot 45 follows the strip S so that the rotational axis Op is at the same position as the center Os in the width direction of the strip S in which the rotation axis Op is twisted. And the damping device 61 is arrange | positioned so that the strip steel S may be hold | maintained in the center part of the width direction of the twisted strip steel S. As shown in FIG. At the same time, the baffle plate 81 follows the steel strip S according to the twist angle θ.

  As shown in FIG. 14, when the twist angle θ is measured such that the driving-side edge portion of the steel strip S rotates toward the main body 15 b, the following operation is performed.

  In the main body 15a, the motor 91 is driven to rotate the cam 95, whereby the eccentric cam surface of the cam 95 is pressed against the inner wall of the side guide 42b on the inner surface side. Accordingly, the movable casing 41 is rotated with respect to the stay 42 in a plane perpendicular to the conveying direction of the steel strip S around the pivot 45, and the opposing wiping nozzle 51 and the vibration damping device 61 are moved with respect to the steel strip S. In the plane, it is rotated by the twist angle θ. At the same time, the pivot 45 is driven to rotate, thereby moving the pivot 45 to the drive side.

  On the other hand, in the main body 15b, the cam 91 of the eccentric cam 95 is pressed against the inner wall of the rear side guide 42b by driving the motor 91 and rotating the cam 95. Accordingly, the movable casing 41 is rotated with respect to the stay 42 in a plane perpendicular to the conveying direction of the steel strip S around the pivot 45, and the opposing wiping nozzle 51 and the vibration damping device 61 are moved with respect to the steel strip S. , Rotate in that plane. At the same time, by rotating the pinion 48, the pivot 45 is moved to the operation side.

As a result, the pivot 45 follows the strip S so that the rotational axis Op is at the same position as the center Os in the width direction of the strip S in which the rotation axis Op is twisted. And the damping device 61 is arrange | positioned so that the strip steel S may be hold | maintained in the center part of the width direction of the twisted strip steel S. As shown in FIG. At the same time, the baffle plate 81 follows the steel strip S according to the twist angle θ.

  In addition, when the steel strip S to be conveyed has meandering and twisting, it can be dealt with by combining the above-described operations of the gas wiping device 15 during meandering and twisting.

  Therefore, according to the gas wiping device of the present invention, the pivot 45 of the movable casing 41 is made to follow the strip S so that the rotation axis Op is at the same position as the center Os in the width direction of the strip S. Thus, the wiping nozzle 51 and the vibration damping device 61 of the movable casing 41 can be arranged so as to hold the steel strip S in the central portion in the width direction of the steel strip S. Thereby, even if meandering or twisting occurs in the steel strip S, the wiping nozzle 51 can be disposed at a position where the edge overcoat can be suppressed, and the electromagnetic force of the electromagnet 63 acts effectively on the vibration damping device 61. Therefore, the warp in the width direction of the strip steel S and the vibration of the strip steel S can be suppressed, and the plating adhesion amount in the width direction of the strip S can be made uniform. As a result, since the coating amount of the steel strip S is stabilized, the speed of the line can be increased, and the productivity can be improved. Accordingly, it is possible to manufacture a hot-dip plated steel sheet in which warpage is sufficiently suppressed over the entire length and the amount of plating adhesion is uniform.

  In addition, since the wiping nozzle 51 and the vibration damping device 61 can always hold the steel strip S in the central portion in the width direction of the band steel S, the lengths of the wiping nozzle 51 and the vibration damping device 61 in the width direction are always increased. Can be shortened. Thereby, the consumption of the wiping gas can be reduced, and the apparatus can be downsized. In addition, since the gap variable amount in the slit 51b of the wiping nozzle 51 can be made symmetrical, the gap amount control can be performed simply.

  The present invention can be applied to a follower mechanism of a baffle plate that follows a band steel to be conveyed.

It is the schematic of the molten metal plating equipment provided with the gas wiping apparatus which concerns on one Example of this invention. It is a front view of the gas wiping apparatus which concerns on one Example of this invention. 1 is a rear view of a gas wiping apparatus according to an embodiment of the present invention. It is AA arrow sectional drawing of FIG. It is a BB arrow sectional view of Drawing 2. It is CC sectional view taken on the line of FIG. It is DD sectional view taken on the line of FIG. It is the figure which showed the gap amount of the slit in a wiping nozzle. It is the figure which showed operation | movement of the gas wiping apparatus when the meandering has not generate | occur | produced in the steel strip, Comprising: (a) is the front view, (b) is a rear view. It is the figure which showed operation | movement of the gas wiping apparatus when meandering to the operation side generate | occur | produces in the strip steel, (a) is the front view, (b) is a rear view. It is the figure which showed operation | movement of the gas wiping apparatus when the meander to the drive side generate | occur | produces in the strip steel, (a) is the front view, (b) is the rear view. It is the figure which showed operation | movement of the gas wiping apparatus when the twist has not generate | occur | produced in the steel strip. It is the figure which showed operation | movement of the gas wiping apparatus when twist generate | occur | produces in a strip steel. It is the figure which showed operation | movement of the gas wiping apparatus when twist generate | occur | produces in a strip steel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molten metal plating equipment 11 Plating bath 12 Sink rolls 13, 14 Support roll 15 Gas wiping device 16 Deflector roll 17 Plating adhesion detection sensor 31 Main frame 32 Rod support 33 Guide rod 34 Hanger 41 Movable casing 42 Stay 43 Guide rail 44 Slide member 45 Pivot 46 Rack guide 47 Rack 48 Pinion 51 Wiping nozzle 51a Chamber 51b Slit 52 Pipe member 53 Pipe support member 54 Hose 55 Wiping gas supply device 56 Gap amount control device 61 Damping device 62 Plate shape detection sensor 63 Electromagnet 71 Meander amount detection sensor 81 Baffle plate 91 Motor 92 Coupling 93 Cam shaft 94 Bearing 95 Cam S Strip steel Os Strip steel sheet width center Op Pinion rotation shaft Ow Transport of strip steel Center X meandering amount θ twist angle

Claims (2)

By blowing wiping gas from the wiping nozzle to the strip that is continuously pulled up from the molten metal plating bath, the excess molten metal adhering to the surface of the strip is removed, and the strip is brought to a predetermined plating adhesion amount. A gas wiping device to control,
Tracking means for moving the wiping nozzle in the width direction of the band plate so that the width direction center position of the wiping nozzle follows the width direction center position of the band plate with respect to the band plate ;
The following means has a rotating means for rotating the wiping nozzle according to a twist angle of a strip,
The gas wiping apparatus according to claim 1, wherein a rotation axis of the wiping nozzle is disposed at a center position in a width direction of the wiping nozzle . The gas wiping apparatus according to claim 1, wherein
It is provided with a correction damping means for suppressing the plate shape and vibration of the band plate by applying a suction force according to the distance to the band plate to the band plate,
The following means moves the correction vibration damping means in the width direction of the band plate so that the width direction center position of the correction vibration damping means follows the width direction center position of the band plate with respect to the band plate ,
The gas wiping apparatus characterized in that the rotating means rotates the correction vibration damping means around the rotation axis in accordance with a twist angle of a strip .

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