JP4299711B2 - Rolling plate winding method and apparatus - Google Patents

Description

  The present invention provides a gate apron between coilers when winding rolled sheets sequentially with a plurality of coilers, preventing contact with the aprons at the leading and trailing ends of the rolled sheets, and switching the coiler for winding the rolled sheets stably and reliably. The present invention relates to a method and apparatus for performing

  Conventionally, when a rolled sheet is sequentially wound by a plurality of coilers, the coiler that winds the rolled sheet is switched by the following apparatus and method.

  When the preceding rolled sheet and the next rolled sheet are wound by two different coilers, the coiler gate that has wound the preceding rolled sheet between the end of winding of the preceding rolled sheet and the winding of the next rolled sheet Is sealed with a mechanical restraint plate (hereinafter referred to as a gate apron), and the tip of the rolled plate is guided to a coiler that winds up the next rolled plate. Such a method and apparatus for repeating the change in the position of the gate apron every time the winding coiler is switched have been used.

  However, this requires time to move the position of the gate apron after the tail end of the preceding rolled sheet passes and before the next rolled sheet is wound.

  However, at the time of speeding up the rolling cycle and / or in a continuous operation state in which the metal plate is continuously rolled, cut by a shear installed in the front stage of the coiler, and wound by the coiler, the next rolled plate is moved from the passage of the tail end of the preceding rolled plate. The interval until the tip of the tube passes is extremely short. In this case, since there is no time to move the gate apron, the following method and apparatus disclosed in Patent Document 1 are used.

  FIG. 1 shows No. 1 far from the final rolling stand. The winding of the rolled plate by a 2 coiler is shown. From this state, as shown in FIG. When switching to 1 coiler, No. 1 in FIG. During the winding of the preceding rolled sheet by the 2 coiler 7, the tip of the next rolled sheet is No. No. 1 to be guided to the gate of 1 coiler. 1 pinch roll (top) 2 and no. Control the offset of 1 pinch roll (bottom) 3. As a result, the rolled plate has a No. 1 in FIG. 1 pinch roll (top) 2 and no. Bending in the vertical direction of a straight line connecting the centers of 1 pinch roll (bottom) 3 and passing the tail end of the preceding rolled plate, the tip of the next rolled plate continues to be No. Wind up with one coiler.

  Conversely, as shown in FIG. When winding a rolled plate with 1 coiler, No. When switching to 2 coilers, no. During winding of the preceding rolled sheet by the 1 coiler, the tip of the next rolled sheet is No. No. 2 of FIG. 1 pinch roll (top) 2 and no. Control the offset of 1 pinch roll (bottom) 3. As a result, the rolled plate has a No. 1 in FIG. 1 pinch roll (top) 2 and no. Bending in the vertical direction of a straight line connecting the centers of one pinch roll (lower) 3 and passing through the tail end of the preceding rolled plate, the tip of the next rolled plate is No. Induced by two coilers.

  At this time, since the guidance of the rolling plate tip due to the offset of the pinch roll is unstable, the gate apron 1 is installed on the rear surface of the pinch roll, and the tip of the rolling plate is directed in a different direction from the coiler gate to be wound. Is preventing. The gate apron 1 is generally fixedly installed. For this reason, when the pressing of the rolled plate by the pinch roll is weak, the rolled plate and the gate apron may come into contact with each other and the rolled plate may be damaged.

  As a solution to this problem, Patent Document 2 discloses a method for preventing rolling of a rolled plate by controlling a winding pinch roll. However, the behavior of the rolled plate in the coiler gate is not only loose due to momentary tension loss, but for example, the centrifugal force consisting of the plate feed speed and roll diameter acts on the rolled plate around the pinch roll. When the tail end of the rolled plate is released from the pinch roll, the swirling of the tail end of the rolled plate due to the centrifugal force occurs, and the rolled plate and the gate apron may come into contact with each other.

  For example, in FIG. Before the winding in the 2 coiler 7 is completed, the rolled plate is No. No. 1 to guide to 1 coiler. 1 pinch roll (top) 2 and no. Since 1 pinch roll (lower) 3 is offset, no. The tail end of the rolled plate wound up by the 2 coiler 7 is 1 pinch roll 2 and no. No. 1 by 1 pinch roll (bottom) 3. It is bent in the direction of 1 coiler and receives a downward centrifugal force. Similarly, in FIG. The tail end of the rolled plate wound up by one coiler 6 receives an upward centrifugal force.

  The whirling of the tail end of the rolled plate due to this centrifugal force is unavoidable with the pinch roll control method that regulates the speed order and the adjustment / setting of the pinch roll pressing force. Since the centrifugal force increases, the swing around the tail end of the rolled plate increases, and as a result, the contact between the rolled plate and the gate apron at the tail end is promoted.

Japanese Patent Laid-Open No. 08-281326 Japanese Patent Laid-Open No. 11-277133

  The present invention eliminates instability in switching of a coiler that winds a rolled plate in a rolling mill that winds the rolled plate with a plurality of coilers, and achieves stable and stable coiler switching and winding. An object is to provide a winding method and apparatus.

  The present inventor, at the time of speeding up the rolling cycle and / or continuously rolling the rolled plate and cutting and winding with a shear installed in the front stage of the coiler, from the rolling conditions, such as the plate speed, the material of the rolled plate, etc. The following findings were found by calculating the run-around behavior of the tip and tail ends of the rolled sheet.

  For example, the gate apron position and / or angle conditions for avoiding contact with the tip of the apron of the gate apron are extremely narrow under certain conditions such as an increase in the plate feed speed, which makes it difficult to switch the gate when the gate apron is fixed. .

  Also, the time interval from the tail end of the preceding rolled plate to the tip of the next rolled plate passes through the gate switching portion is very short, but the time interval from the tip of the rolled plate to the tail end passes through the gate switching portion is long.

  Based on this knowledge, we aimed to widen the conditions of the position and / or angle of the gate apron where the contact of the tip of the gate apron is avoided by injecting a fluid consisting of gas and / or liquid at the gate switching part. . Furthermore, the run-out behavior of the leading end of the preceding rolled plate and the tail end of the next rolled plate is calculated from the material and size of the rolled plate, rolling conditions, and fluid injection conditions to avoid contact between the rolled plate and the gate apron. The invention has led to the invention of a method and apparatus for stably switching the coiler by controlling the injection conditions of the fluid to be obtained, and further controlling the position and / or angle of the gate apron.

  The gist of the present invention is as follows.

(1) a metal plate is continuously rolled, and cut the rolled sheet between the final rolling stand and the coiler, the winding of the rolled sheet winding the rolled plate by switching a plurality of coiler by installing the pinch rolls before the coiler In the removing method , a fluid made of gas and / or liquid is jetted from the gate switching unit toward the tail end of the rolled plate passing between the coilers, and the tip and tail ends of the rolled plate and the gate apron. A method for winding a rolled plate, characterized by avoiding contact with the sheet.

  (2) Deriving the run-out behavior of the rolled plate tip and tail from the rolling plate material and size and rolling conditions, and depending on the presence or absence of contact between the rolled plate tip and tail and the gate apron The method of winding a rolled sheet according to (1), wherein the fluid is injected to avoid contact between the tip and tail ends of the rolled sheet and the gate apron.

  (3) Deriving the whirling behavior of the rolling plate tip and tail from the material and size of the rolled plate to be wound, the rolling conditions, and the injection conditions of the fluid sprayed to the rolling plate, and the rolling plate tip, tail and gate The rolling according to (1), wherein the contact condition between the tip and tail ends of the rolled plate and the gate apron is adjusted by adjusting the spray condition of the fluid sprayed onto the rolled plate according to the determination of the presence or absence of contact with the apron. Winding method of the board.

  (4) The rolling plate winding method according to (2) or (3), wherein the position and / or angle of the gate apron is adjusted.

(5) In a winding device for a rolled plate having a pinch roll for disposing a cutting machine between a final rolling stand and a plurality of coilers and switching the coiler immediately before the coiler, gas and / or liquid is provided at a gate switching unit between the coilers. A rolling plate winding device comprising at least one fluid jetting device that jets a fluid consisting of the fluid toward a tail end of a passing rolling plate .

  (6) Derivation of the rolling behavior of the tip and tail of the rolled plate from the material and size of the rolled plate, rolling conditions, and the injection conditions of the fluid injected to the rolled plate, and contact between the tip and tail of the rolled plate and the gate apron (5) The rolling plate winding device according to (5), further comprising: an arithmetic device that determines whether or not there is a fluid, and a device that controls fluid ejection conditions based on the calculation result.

  (7) Derivation of the rolling behavior of the tip and tail of the rolled plate from the material and size of the rolled plate, rolling conditions, and the injection conditions of the fluid injected to the rolled plate, and contact between the tip and tail of the rolled plate and the gate apron (5) or (6), characterized in that it has a calculation device for determining whether or not there is a device and a device for controlling the position and / or angle of the gate apron based on the calculation result apparatus.

  As is apparent from the above description, according to the present invention, a coiler is brought into contact with the gate apron due to the swirling behavior of the leading end and the tail end of the rolled plate by fluid injection or fluid injection and gate position / angle adjustment. Can be switched, and the winding of the rolled plate is stabilized.

  At the same time, it is possible to minimize the energy cost associated with the fluid injection that is input to stabilize the coiler switching.

  As a result, not only the productivity and the work rate are improved by stabilizing the operation, but also the quality improvement effect of the steel sheet can be obtained by enabling a stable speeding of the sheet passing.

  Hereinafter, embodiments of the present invention will be described together with examples.

Each condition used in this example is a plate thickness of 1.2 mm, a plate width of 1000 mm, a Young's modulus of 21000 kgf / mm ² , a mass density of 7.43 × 10 ⁻¹⁰ , and a plate passing speed of 1000 mpm.

  3 to 5 are No. 1 as an example of the embodiment of the present invention. 2 No. 7 The state at the time of switching to 1 coiler 6 is shown, the contact between the tip and tail ends of the rolled plate and the gate apron is prevented by spraying the fluid onto the rolled plate, and the coil switching and winding for winding the rolled plate are shown. It is explanatory drawing regarding the method of achieving stabilization of taking. In FIG. No. 2 is located in the vicinity of the tail end of the preceding rolled plate 8 wound up by the coiler 7. It is in a state of being restrained by one pinch roll, and the tip of the next rolled plate 9 is No. It reaches to the side with 1 pinch roll.

  At this time, the No. of the pre-rolled sheet 8 was changed. 1 Pinch roll (upper) 2 is wound around the part and the plate feed speed and No. The downward centrifugal force generated by the curvature of 1 pinch roll (upper) 2 is acting. From this state, as shown in FIG. When 1 pinch roll is removed, no. As shown in FIG. 4, even if there is no bumping of the rolled plate due to the momentary release of the tension at the tail end of the preceding rolled plate 8 due to the downward centrifugal force of the preceding rolled plate wound around one pinch roll, as shown in FIG. The tail end of the plate 8 generates a downward swing and becomes a locus a that contacts the gate apron 1. When such a swing is increased, the tail end of the preceding rolled plate 8 may wrap around the tip of the gate apron 1 and break.

  Further, since the centrifugal force of the rolled plate that causes the downward swing of the tail end of the preceding rolled plate 8 increases in proportion to the square of the plate passing speed, for example, the tip of the rolled plate is increased by increasing the plate passing speed. And the tail end becomes easy to contact the gate apron.

  On the other hand, the behavior of the tip of the next rolled plate 9 is No. 1 pinch roll (top) 2 and no. Since it depends only on the induction by the offset of the 1 pinch roll (lower) 3, the influence of these offsets and the rolling force fluctuation is large. For example, instantly No. When the rolling force of one pinch roll is reduced, the tip of the next rolled sheet 9 changes in the direction of the gate apron 1 and induces contact between the tip of the next rolled sheet 9 and the gate apron 1.

  In order to avoid the contact between the tip and tail ends of the rolled plate and the gate apron when the coiler is switched as described above, the present invention is configured so that the tail end of the preceding rolled plate 8 is No. 1, as shown in FIG. When passing through one pinch roll, fluid is sprayed to the back surface of the tail end of the preceding rolled plate 8. The fluid inertia of the fluid jet 10 can push up the tail end of the preceding rolled plate and avoid contact with the gate apron. In addition, the fluid jet 10 may be a pre-rolled plate 8 and / or no. No. 1 per pinch roll A swirl flow 11 is generated downward on the exit side of the one pinch roll and hits the upper surface of the tip of the next rolled sheet. For this reason, the fluid inertia force acts on the next rolled sheet downward, that is, in a direction avoiding contact with the gate apron 1. In this way, by the fluid injection, the tail end of the preceding rolled plate and the trajectory of the next rolled plate can be changed in the direction away from the gate apron, and stable switching and winding of the coiler can be achieved.

  6 to 8 are reverse examples of the embodiment of the present invention. No. 1 coiler 6 no. The state at the time of switching to the 2 coiler 7 is shown. In FIG. No. 1 indicates the vicinity of the tail end of the preceding rolled plate 8 wound up by the 1 coiler 6. The tip of the next rolled sheet 9 is in the state of being restrained by 1 pinch roll. It has reached the entrance side of 1 pinch roll. At this time, the No. of the pre-rolled sheet 8 was changed. No. 1 pinch roll (bottom) is wrapped around the part 3 and the plate speed and No. The upper centrifugal force generated by the curvature of 1 pinch roll (lower) 3 is acting.

  From this state, as shown in FIG. When one pinch roll is passed, the tail end of the preceding rolled plate 8 causes an upward swing around the tail end of the preceding rolled plate 8 due to the upward centrifugal force acting on the tail end of the preceding rolled plate 8, contrary to FIG. The tail end of this will contact the gate apron 1. On the other hand, the runout around the tip of the next rolled plate 9 is No. It depends only on the induction by the offset of 1 pinch roll. Contact between the tip of the next rolled sheet 9 and the gate apron 1 may be induced by the offset of one pinch roll and the fluctuation of the rolling force.

  Also in this case, injection of fluid from the gate apron to the rolled plate is effective. As shown in FIG. If the fluid is jetted in the direction of the tail end of the preceding rolled sheet when passing through one pinch roll, the fluid jet 10 pushes the tail end of the preceding rolled sheet downward, and further The tip 11 of the next rolled plate is pushed upward by the swirl flow 11 generated upward on the exit side of one pinch roll, and stable coiler switching and winding are achieved.

  9 is a diagram showing a method for deriving the swinging behavior of the tip and tail ends of the rolled plate passing through the gate portion. This is an example of the swinging behavior of the tail end of a rolled plate wound up by a two coiler.

  The whirling behavior of the tip and tail of the rolled plate that passes between the coilers is determined by the motion of the cantilever beam that is subjected to external forces such as centrifugal force of the rolled plate that winds around the pinch roll and fluid force that acts on the rolled plate by fluid injection. Here, a beam model in which an external force acts is expressed in a discrete manner, formulated by a Lagrangian equation of motion, and a method of analyzing and evaluating the motion by numerical analysis is employed.

  When the length of the rolled plate from the tail end of the rolled plate to the fulcrum of the transport roll 12 is Ls and this is discretized into N divisions, the discretized mass masses mi are the plate thickness ts, plate width Bs, and mass density ρs. The discretized stiffness k i between the mass points is expressed by the following equation as the plate Young's modulus Es and the mass point distance li.

  When the formulation is performed by the Lagrangian equation of motion using each mass point, each stiffness, and the external force vector acting on each mass point, the following equation is obtained as shown in FIG.

  From this equation of motion, the position of each mass point at each time is derived by numerical analysis using the central difference method.

  By the above calculation, the position of each mass point at each time, that is, the time change of the whirling behavior of the steel sheet is derived.

The external force acting on the tail end of the rolled plate is due to the centrifugal force of the rolled plate wound around the roll, and the rolled plate in a range where the centrifugal force F, the roll radius is r, the plate passing speed is us, and the roll is wound around the roll. The mass is expressed as follows, where m is m.
F = m us ² / r
Moreover, the fluid inertia which acts on a rolled sheet is derived | led-out from the momentum which a fluid has.

  Therefore, from the above, the run-out behavior of the rolled plate that passes through the gate portion is the plate thickness, plate width, Young's modulus, the distance between the pinch roll and the conveying roll, the plate speed related to external force, the pinch roll related to the rigidity of the rolled plate. The amount varies depending on the offset amount, the winding length around the pinch roll, the pinch roll diameter, the fluid ejection speed, the flow rate, the ejection direction, and the ejection timing.

  FIGS. 10 to 12 summarize the above contents. In addition to the conditions of the above-described embodiment, the following values are used as conditions used for calculating the whirling behavior of the plate.

  Number of divisions 5, roll radii 460 and 230 mm, distance between mass points 200 and 600 mm, time increment 0.008 sec.

  As shown in FIG. 10, the locus of the tip and tail of the rolled plate passing through the coiler gate part is No. No. 1 to No. 1 Trajectory 14 at the tail end of the preceding rolled plate at the time of switching the two coiler, No. No. 1 to No. 1 Trajectory 15, No. of the next rolled sheet when switching between two coilers. No. 2 to No. Trajectory 16 of the preceding rolled plate tail at the time of switching 1 coiler, No. No. 2 to No. 4 trajectories of the next rolling plate tip at the time of switching one coiler, and the tip of the gate apron 1 is arranged in a hatched portion 18 (hereinafter referred to as a gate condition stabilization region) which is a shared region of the four trajectories. If this is done, stable rolling of the coiler can be performed without contact between the rolled plate and the gate apron.

  However, the trajectories 14 to 17 of the tip and tail ends of the rolled plate change depending on the material, size, and rolling conditions of the rolled plate, and accordingly, the gate condition stabilization region 18 may be extremely narrow. When the coiler is switched, the rolled plate and the gate apron may contact each other.

  FIG. 11 shows changes in the gate condition stabilization region 18 when the plate passing speed is increased to (a) 1000 mpm, (b) 1300 mpm, and (c) 1500 mpm. In the case where the tip of the gate apron 1 is arranged in this range as the plate passing speed increases, for example, No. No. 2 to No. The trajectory 16 at the tail end of the preceding rolled sheet and the gate apron 1 at the time of switching the one coiler come into contact with each other at an extremely acute angle.

  In this state, as shown in FIG. No. 2 to No. When fluid is applied to the tail end of the preceding rolled plate at the time of switching one coiler, the downward swing amount of the tail end at the gate switching portion decreases, and as a result, the gate condition stabilization region increases and gate switching is stabilized. To do.

In the example shown in FIG. 12, the fluid to be used is air and the initial jet velocity from the nozzle is 250 m / sec under the conditions of a plate thickness of 1.2 mm, a plate width of 1000 mm, a Young's modulus of 2100 kgf / mm ² , and a plate speed of 1000 mpm. It was.

  Further, as the nozzle conditions, a flat nozzle having a slit width of 7 mm and a nozzle width of 800 mm is used, and the ejection angle is inclined 20 degrees upward from the horizontal axis.

  In this condition, air is used as the fluid that acts on the rolled sheet, but the fluid is not particularly limited to air, and any fluid such as gas or liquid can be used.

  Conventionally, when continuously switching and winding the rolled plate, the time interval between the preceding rolled plate and the next rolled plate is considered short, and the gate is used in a fixed state. It takes a long time to pass through the gate switching unit, and as shown in FIG. No. 1 to No. 1 A hatched area 19 (hereinafter referred to as a local gate condition stabilization area) surrounded by a locus 14 of the tail end of the preceding rolled sheet and a locus 15 of the leading end of the next rolled sheet at the time of switching between the two coilers; . No. 2 to No. The position and / or angle of the gate apron so that the tip of the gate apron 1 is arranged in the local gate condition stabilization region 19 surrounded by the locus 16 of the preceding rolled plate and the locus 17 of the next rolled plate when switching one coiler. Can be changed.

  This change in the arrangement of the gate apron 1 increases the stability of gate switching.

  14 is a schematic diagram showing a state in which the above-described gate switching stabilization method using fluid action is combined with the gate switching stabilization method using gate apron arrangement change. No. 2 The state of switching to 1 coiler is shown.

  In the initial state, from the state in which the tip of the gate apron 1 is arranged in the shared region of the locus 16 of the tail end of the preceding rolled plate and the locus 17 of the tip of the next rolled plate, The amount of downward swirling of the tail end of the preceding rolled plate is increased, and the state comes into contact with the tip of the gate apron 1.

  In this case, since the local gate condition stabilization region becomes extremely narrow, the expansion of the gate condition stabilization region due to fluid action and the change in the position and / or angle of the gate apron to the expanded local gate condition stabilization region Thus, switching can be performed stably.

  FIG. 15 shows an analysis flow of the run-out behavior of the rolled plate passing through the gate portion and the change flow of the gate conditions, which are arranged as described above.

  The calculation and control based on this flow may be performed while the tail end of the rolled sheet passes through the gate switching section, and if the conditions of the rolled sheet are known in advance, the calculation should be performed in advance. Also good.

  In the above description, the winding by two coilers has been described. However, in order to perform winding by three or more coilers, in FIGS. 1 Gate apron 1 on the rear side of the coiler, transport roll 10, No. 1 2-pinch roll (top) 4 and No. 2 2-pinch roll (bottom) 5 and No. 2 One or more sets of configurations comprising two coilers 7 What is necessary is just to install in the rear surface of the 2 coiler 7.

It is a schematic diagram which shows the plate | board behavior of a coiler part. (Switching from No. 2 coiler to No. 1 coiler) It is a schematic diagram which shows the plate | board behavior of a coiler part. (Switching from No. 1 coiler to No. 2 coiler) It is a schematic diagram which shows an example of embodiment of this invention. It is a schematic diagram which shows the run-around behavior of the front-end | tip and tail end of a rolled sheet in the gate switching part in case there is no fluid action. It is a schematic diagram which shows the run-around behavior of the front-end | tip and tail end of a rolled sheet in the gate switching part in case there exists a fluid effect | action. It is a schematic diagram which shows another example of embodiment of this invention. It is a schematic diagram which shows the run-around behavior of the front-end | tip and tail end of a rolled sheet in the gate switching part in case there is no fluid action. It is a schematic diagram which shows the run-around behavior of the front-end | tip and tail end of a rolled sheet in the gate switching part in case there exists a fluid effect | action. It is a schematic diagram explaining the modeling example of the front-end | tip and tail end of the steel plate which passes a gate part, (a) shows a beam model, (b) shows the discrete expression of a beam model. It is a schematic diagram which shows the example of an analysis result of the sheet-passing behavior locus of the steel plate front-end | tip and tail end at the time of a coiler switching. It is the schematic which shows the boarding behavior of the coiler part at the time of changing a boarding speed, (a) is 1000 mpm, (b) is 1300 mpm, (c) shows the case of 1500 mpm. It is a figure which shows the example of analysis of the steel plate whirling behavior suppression effect by a fluid action, (a) is an outline | summary of a coiler part, (b) is the whirling behavior of the steel plate in case of no fluid action, (c) is a fluid action. The steel plate run-out behavior is shown for each case. It is a schematic diagram which shows the example 1 of the board trajectory of the steel plate front-end | tip and tail end in a gate part (a)-(d). No. 1 to No. 1 When switching between two coilers, (e) to (h) are No. No. 2 to No. The case of switching to 1 coiler is shown. It is a schematic diagram showing a plate trajectory example 2 of the steel plate tip and tail end in the gate portion. No. 2 to No. When switching to 1 coiler, (a) is no fluid injection and gate apron is fixed (initial basic condition), (b) is no fluid injection and gate apron is fixed (through plate speed increase), (c ) Shows the case of fluid ejection and gate apron position / angle change. It is a figure which shows the analysis flow of the whirling behavior of the rolling plate which passes a gate part, and the change flow of gate conditions.

Explanation of symbols

1 ... Coiler gate apron 2 ... No. 1 pinch roll (top)
3 ... No. 1 pinch roll (bottom)
4 ... No. 2 pinch rolls (top)
5 ... No. 2 pinch rolls (bottom)
6 ... No. 1 coiler 7 2 coiler 8 ... steel plate (preceding material)
9 ... Steel plate (following material)
10 ... Fluid jet (direct flow)
11 ... Fluid jet (swirl)
12 ... Transport roll 13 ... Fluid ejection nozzle 14 ... No. No. 1 to No. 1 The leading material tail end locus 15 at the time of switching the two coiler. No. 1 to No. 1 Trailing material tip trajectory 16 at the time of switching between two coilers. No. 2 The leading material tail end locus 17 at the time of switching one coiler ... No. No. 2 to No. Trailing material tip trajectory 18 at the time of switching one coiler ... Possible range 19 of the apron tip position for stable switching ... Local gate condition stabilization region a ... Leading material tail trajectory (no fluid action)
b ... Trailing material tip trajectory (no fluid action)
A ... Leading material tail end trajectory (with fluid action)
B ... Trailing material tip trajectory (with fluid action)

Claims (7)

In a rolling plate winding method in which a metal plate is continuously rolled, the rolled plate is cut between a final rolling stand and a coiler, and a plurality of coilers are switched by a pinch roll installed in front of the coiler to wind the rolled plate . Then, a fluid made of gas and / or liquid is jetted from the gate switching section toward the tail end of the rolled plate passing between the coilers, and the tip and tail ends of the rolled plate are brought into contact with the gate apron. A method for winding a rolled plate, characterized in that it is avoided.   Deriving the run-out behavior of the rolled plate tip and tail from the rolling plate material and size to be rolled up, and rolling conditions, and applying fluid depending on the presence or absence of contact between the rolled plate tip and tail and the gate apron. The rolling plate winding method according to claim 1, wherein spraying is performed to avoid contact between the tip and tail ends of the rolled plate and the gate apron.   The rolling behavior of the rolling plate tip and tail end is derived from the material and size of the rolled plate to be wound, the rolling conditions, and the injection condition of the fluid sprayed to the rolling plate, and the rolling plate tip and tail ends and the gate apron The rolling sheet winding according to claim 1, wherein the contact condition between the tip and tail ends of the rolled sheet and the gate apron is adjusted by adjusting the injection condition of the fluid sprayed onto the rolled sheet according to the determination of the presence or absence of contact. How to take.   4. The rolled sheet winding method according to claim 2, wherein the position and / or angle of the gate apron is adjusted. In a rolling plate winding device having a pinch roll that switches a coiler immediately before the coiler by placing a cutting machine between the final rolling stand and the plurality of coilers, a fluid made of gas and / or liquid at a gate switching unit between the coils A rolling plate winding device comprising: at least one fluid ejecting device that injects the fluid toward a tail end of a passing rolled plate .   Derivation of run-out behavior of the tip and tail of the rolled plate from the material and size of the rolled plate, rolling conditions, and the injection condition of the fluid injected to the rolled plate, and whether there is contact between the tip and tail of the rolled plate and the gate apron 6. The rolled sheet winding apparatus according to claim 5, further comprising: an arithmetic unit that performs a determination; and an apparatus that controls a fluid ejection condition based on a calculation result.   Derivation of run-out behavior of the tip and tail of the rolled plate from the material and size of the rolled plate, rolling conditions, and the injection condition of the fluid injected to the rolled plate, and whether there is contact between the tip and tail of the rolled plate and the gate apron 7. The rolled sheet winding apparatus according to claim 5, further comprising: an arithmetic unit that performs a determination; and a unit that controls a position and / or angle of the gate apron based on a calculation result.

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