Method of adjusting the cone of a coiler crown

Abstract

The application discloses a method for adjusting the tower type of a steel coil, and comprises the following steps: determining the stroke of a telescopic assembly; when the remaining last N coil lengths of a strip steel are wound on a winding drum, the strip steel enters a tail swing state; the bending roller of a recoiling device is pressed down; before the tail of the strip steel passes through a tension device, the swing hydraulic cylinder of a tail pressing roller device swings downward to make the middle roller of a multifunctional tail pressing roller press the steel coil; when the strip steel is completely wound on the winding drum, the centering mechanism on the multifunctional tail pressing roller centers the N coils of the strip tail; after the centering is completed, the uncoiler car is lifted to touch the strip tail of the steel coil with a press; the bending roller and the multifunctional tail pressing roller are lifted at the same time, the centering mechanism is driven to the maximum opening degree by the telescopic assembly and waits; the winding drum is retracted, the jaws are opened, and the uncoiler car lifts the steel coil; and the uncoiler car uncoils the steel coil. The multifunctional tail pressing roller arranged behind the winding drum of the winding machine can effectively avoid the tower type defect of the steel coil.

Description

Technical Field

[0001] The present application belongs to the field of steel rolling technology, and specifically relates to a method for adjusting the tower shape of the outer ring of a strip coil. Background Art

[0002] Hot-rolled skin-passing and rewinding mills are used to flatten, rewind, and rewind steel coils at room temperature after hot rolling. After processing according to the mill's production process requirements, the strip's mechanical properties, shape, and surface quality are enhanced, resulting in coils that meet user requirements. However, both hot-rolled skin-passing mills and strip-leading and rewinding mills suffer from a common problem: the formation of towering strips during the rewinding process, which seriously affects product quality. Although existing technologies incorporate side guide roller centering devices during strip threading and during tailing to mitigate towering, this phenomenon is still unavoidable during the first three turns of the rewinding process and the last three turns of the tailing.

[0003] This is because the existing technology takes into account the space limitations next to the coiler and sets the centering device at the jaws of the unit away from the coiler drum. In this way, the position where the strip head enters the coiler deviates from the position where the strip is aligned in the middle of the unit, causing the position of the strip head when the jaws are clamped to be inconsistent with the actual center position of the strip, resulting in a tower-shaped inner core of the steel coil; in view of this, the present application integrates it with the tail pressure roller.

[0004] In existing hot-rolling skin-pass mills or stainless steel strip rewinding mills, production line lengths range from 20 to 30 meters. Two sets of side guide roller centering devices are located near the uncoiler and coiler at the front and rear of the mill. Due to limited space near the coiler, these devices are installed away from the coiler drum. This is intended to ensure that the front and rear strips resting on the mill are aligned with the mill centerline, but in practice, this is less than ideal. Existing side guide roller centering devices only operate on stationary strips and cannot be adjusted for dynamic conditions. This is because front-to-back centering adjustments during strip movement would deform and arch the strip, causing varying degrees of damage to both the equipment and the strip.

[0005] Moreover, the transmission mode of the side guide roller centering device is mostly a motor-driven ball screw or hand wheel adjustment, which has low adjustment accuracy and slow speed. The side guide roller is easy to squeeze and scratch the edge of the strip. The side guide roller is made of 45# steel. During the alignment process, the strip edge is squeezed and scratched. In the event of misoperation, the strip and the side guide roller rub against each other, causing serious damage.

[0006] The current method to eliminate the tower-shaped defect of strip steel is mainly to install a camera near the uncoiler, and manually intervene in the uncoiler CPC (center position control) according to the monitoring signal to correct the tower-shaped position during the coiling process. Summary of the Invention

[0007] To this end, the present application proposes a method for adjusting the tower shape of the outer ring of a steel coil, comprising the following steps:

[0008] Step 0: Determine the opening of the centering mechanism according to the width of the strip to be produced, thereby determining the stroke of the telescopic component. The stroke of the telescopic component can enable the side rollers of the centering mechanism to reach the set centering position;

[0009] Step 1: When the strip steel is wound on the coiler drum for the remaining N turns, the rewinding equipment slows down to the threading speed and the strip steel enters the tail swinging state;

[0010] Step 2: During the strip spinning process, the bending rollers of the rewinding equipment press down on the strip to prevent destructive strip spinning caused by misoperation.

[0011] Step 3: Before the tail of the strip passes through the tension device, the swing hydraulic cylinder of the tail pressing roller device swings downward, so that the middle roller of the multifunctional tail pressing roller presses the steel coil;

[0012] Step 4: When the strip is completely wound on the coiler drum, the centering mechanism on the multifunctional tail roller will center the N turns of the strip tail;

[0013] Step 5: After the alignment is completed, the unloading car rises and presses the tail of the steel coil with contact pressure;

[0014] Step 6: After the tail of the strip is in a stable state, the bending roller and the multifunctional tail roller are lifted at the same time, and the centering mechanism is driven by the telescopic assembly to the maximum opening and waits;

[0015] Step 7: The reel shrinks, the jaws open, and the unloading vehicle lifts the steel coil to ensure that the inner ring of the steel coil is separated from the outer surface of the reel;

[0016] Step 8: The unloading car pulls the steel coil away from the reel in the direction away from the reel to unload the coil.

[0017] Optional, 1≤N≤3.

[0018] Optionally, in step 4, the centering mechanism on the multifunctional tail pressure roller centers the N turns of the tail of the belt, including: each pair of edge rollers is driven by the telescopic assembly to move toward the center to a set centering position, and at the same time the reel rotates 1-2 turns in the winding direction to eliminate the tower shape of the outer ring of the steel coil.

[0019] Optionally, the multifunctional tail pressing roller comprises a frame seat mounted on the output end of the swing hydraulic cylinder of the tail pressing roller device, an intermediate roller and a centering mechanism mounted on the frame seat, and the centering mechanism comprises:

[0020] At least one pair of side rollers on both sides of the strip tail on the coiler drum and a pair of telescopic components connected between each pair of side rollers. Each pair of side rollers is driven by a pair of telescopic components to clamp the side edges of the strip tail and align them with the center line of the recoiling equipment.

[0021] Optionally, an intermediate roller shaft is provided on the frame seat, and an intermediate roller is installed on the intermediate roller shaft, and the intermediate roller is used to press the plate surface at the tail end of the strip.

[0022] Optionally, each pair of telescopic components is fixed on the middle beam seat of the frame seat, and a guide rod parallel to the transmission direction of the telescopic component is provided on the frame seat, and sliding supports are slidably connected to both ends of the guide rod, and the two side rollers are respectively connected to the corresponding sliding supports, and the sliding supports are respectively connected to the output ends of the telescopic components.

[0023] Optionally, the side roller is a high-density rubber roller.

[0024] Optionally, the side rollers are rotatably connected to the sliding supports.

[0025] Optionally, a pressure plate fixed on the sliding support is provided on the side of the side roller away from the frame seat.

[0026] Optionally, the telescopic component is a hydraulic cylinder, and the hydraulic cylinder uses a proportional valve to control the stroke.

[0027] The technical effects of the present invention are as follows:

[0028] (1) The present invention is used in a hot rolling skin-pass mill or a stainless steel strip rewinding mill. Although the production line length varies from 20 to 30 meters, the normal centering function of the mill is retained. The multifunctional tail roller is arranged behind the coiler drum, which can effectively avoid the tower-shaped defect of the outer ring of the steel coil.

[0029] (2) The present invention avoids the dynamic adjustment process of the steel coil outer ring tower shape. The steel coil outer ring tower shape is adjusted during the tail swinging process. The centering function of the tail roller maintains the locking width of the side guide rollers of the centering device during the rotation of the reel. The strip passes through the middle of the two side guide rollers. Because there is no tension in the front and back of the reel, and the tail roller centering device is close to the reel and presses the tail of the steel coil through the middle roller, the strip tail runs according to the opening width of the two side guide rollers until the reel is rolled up. The dynamic adjustment process is continuous and more accurate than the existing technology.

[0030] (3) The centering mechanism of the present invention has high adjustment accuracy and fast speed. The centering mechanism is attached to the multifunctional tail roller and uses a proportional valve to control the hydraulic cylinder of the MTL for precise control. The adjustment speed is fast, efficient and accurate.

[0031] (4) The edge roller of the present invention is made of a high-density rubber roller, which can avoid the side guide roller and the edge of the strip from being squeezed and scratched. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of a rewinding device according to an embodiment of the present invention.

[0033] Figure 2 This is a step diagram of a method for adjusting the tower shape of the outer ring of a steel coil according to an embodiment of the present invention.

[0034] Figure 3 for Figure 2 A side view of the centering mechanism;

[0035] Figure 4 Figure 3 Cross-sectional view of the BB position in . DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0037] The so-called dynamic adjustment of the steel coil to avoid the tower shape of the outer ring means that the centering function is involved in the action during the winding process of the steel coil, and the outer ring of the reel is kept neat and consistent during the winding process, so that the outer ring of the steel coil does not have a tower shape.

[0038] like Figure 1 As shown, the method for adjusting the outer ring convolution of a strip steel coil according to this embodiment is used in the recoiling process of a hot-rolling skin-pass mill or a stainless steel strip recoiling unit to center and compact the tail of the strip steel. Both the hot-rolling skin-pass mill and the stainless steel strip recoiling unit include a recoiling device, which includes a tensioning device 1, a coiler drum 2, a tail roller device 3, a coil unloading car 4, a guide plate 5, and a bending roller 7. The recoiling device recoils the strip steel. The leading edge of the recoiling strip 100 aligns with the jaws of the coiler drum 2 and, as the tensioning device 1 pulls the strip toward the jaws (not shown) of the coiler drum 2, the leading edge of the strip steel is guided by the guide plate 5 into the jaws, where it is then wound onto the coiler drum 2. When the strip steel reaches the tail, the method for adjusting the outer ring convolution of this embodiment is used to center and compact the tail of the strip steel wound onto the coiler drum 2.

[0039] The tail pressing roller device 3 includes a swinging hydraulic cylinder. The multifunctional tail pressing roller is installed at the output end of the swinging hydraulic cylinder through the frame seat 301. The multifunctional tail pressing roller is provided with an intermediate roller and a centering mechanism. The tail pressing roller device 3 drives the multifunctional tail pressing roller to swing through the swinging hydraulic cylinder 312, so that the intermediate roller 303 installed on the frame seat 301 presses the steel coil to prevent it from loosening, and the centering mechanism adjusts the centering of the outer ring of the steel coil before unloading, especially avoiding the tower-shaped phenomenon of the outer three rings of the strip.

[0040] Methods for adjusting the outer ring tower of the steel coil, such as Figure 2 As shown, the steps include:

[0041] Step 0: Determine the centering mechanism's opening (i.e., the distance between the side rollers 306) based on the strip width being produced, thereby determining the stroke of the hydraulic cylinder. The setting device is a displacement sensor on the cylinder. The stroke of the hydraulic cylinder allows the side rollers of the centering mechanism to reach the set centering position.

[0042] Step 1: When the strip is coiled to the last N turns, the rewinding equipment is decelerated to cancel the front and rear tensions and the strip enters a tail-swinging state, wherein N is preferably 3;

[0043] Step 2: During the strip tailing process, the bending roller 7 of the tension device 1 is pressed down to a suitable position to prevent destructive strip tailing caused by misoperation;

[0044] Step 3: Before the tail of the strip passes through the tension device 1, the swing hydraulic cylinder of the tail pressing roller device 3 swings downward, causing the middle roller of the multifunctional tail pressing roller to press down and approach the steel coil. Specifically, the middle roller 303 presses down on the tail of the steel coil to prevent the untensioned strip coil from unwinding.

[0045] Step 4: When the strip is completely wound on the coiler drum, the centering mechanism on the multifunctional tail roller closely centers the N turns of the strip tail. Specifically, the side rollers 306 on both sides are driven by two hydraulic cylinders to move toward the center to the set centering position. At the same time, the drum 2 rotates 1-2 turns at a low speed in the winding direction to ensure that the tower shape of the outer ring of the steel coil is eliminated.

[0046] Step 5: After the alignment is completed, the unloading car 4 slowly rises, contacts the steel coil and presses the tail of the steel coil with appropriate contact pressure to prevent the tail of the steel coil from unwinding;

[0047] Step 6: The tail of the strip is in a stable state between its own weight and the lifting pressure of the unloading car. The bending roller 7 and the multifunctional tail roller are lifted at the same time, and the side roller 306 is quickly opened by the hydraulic cylinder to the maximum opening and waits;

[0048] Step 7: The coil retracts, the jaws open, and the unloading car 4 slowly lifts the steel coil a certain distance to ensure that the inner ring of the steel coil is away from the contact surface of the coil outer surface;

[0049] Step 8: The unloading car 4 carries the steel coil at a stable height, and pulls the steel coil away from the reel in a direction away from the reel to unload the coil.

[0050] Through the above steps, it can be ensured that during the rewinding process, there is no tower shape on the outer ring of the steel coil, and it can be packaged into qualified products.

[0051] The following describes the multifunctional tail roller structure used in the method for adjusting the outer ring tower shape of the strip coiling in this embodiment.

[0052] The multifunctional tail roller of this embodiment is used to center and compress the tail of the strip during the recoiling process of a hot-rolled skin-pass mill or a stainless steel strip recoiling unit. Both hot-rolled skin-pass mills and stainless steel strip recoiling units include a recoiling unit, which comprises a tensioning device 1, a coiler drum 2, a tail roller assembly 3, a coil unloading car 4, a guide plate platform 5, and a bending roller 7. The recoiling unit recoils the strip. The multifunctional tail roller of this embodiment comprises a frame 301 mounted at the output end of the swing hydraulic cylinder 312 of the tail roller assembly 3, an intermediate roller 303 attached to the frame 301, and a centering mechanism.

[0053] The head of the strip 100 to be re-coiled corresponds to the position of the jaws on the coiler drum 2, and moves toward the jaws (not shown in the figure) on the coiler drum 2 as the tension device 1 pulls. The head of the strip is guided into the jaws on the guide table 5, and is thus wound on the coiler drum 2. When winding to the tail of the strip, the multifunctional tail pressure roller of this embodiment is used to center and press the tail of the strip wound on the coiler drum 2.

[0054] like Figures 3 to 4 As shown, the frame seat 301 is parallel to the axis of the coiler drum 2, and an intermediate roller shaft 302 is provided on the frame seat 301. An intermediate roller 303 is installed on the intermediate roller shaft 302, which can swing up and down with the swing hydraulic cylinder. The intermediate roller 303 is used to press the plate surface at the tail of the strip, so that the outer ring of the rolled steel coil is easily aligned before unloading, avoiding the tower-shaped phenomenon of the outer three rings of the strip.

[0055] The centering mechanism is described below. A pair of telescopic assemblies are mounted on the frame base 301. These assemblies can be hydraulic cylinders, either two hydraulic cylinders or a double-ended hydraulic cylinder 304. The double-ended hydraulic cylinder 304 is used as an example. It is fixed to the center beam 305 of the frame base 301. Side rollers 306 are mounted at the ends of the double-ended hydraulic cylinder 304. These rollers can be made of high-density rubber. These side rollers 306 are located on either side of the center roller 303, more specifically, on either side of the strip. The telescopic assemblies extend and retract to center or release the side rollers 306 on either side of the strip's tail. The output ends of the double-headed hydraulic cylinder 304 operate synchronously; in actual use, when the tail of the strip is between the two side rollers 306, the double-headed hydraulic cylinder 304 moves the two side rollers 306 closer to each other, thereby clamping the tail of the strip and aligning it to the center line of the entire leveling unit, thereby achieving precise correspondence with the jaws on the reel.

[0056] More specifically, to enable the two side rollers 306 to move with the double-headed hydraulic cylinder 304, a guide rod 307 parallel to the transmission direction of the double-headed hydraulic cylinder 304 can be provided on the frame base 301. Sliding supports 308 are slidably connected to both ends of the guide rod 307. The two side rollers 306 are respectively connected to the two sliding supports 308. The lower ends of the two sliding supports 308 are respectively connected to the two output ends of the double-headed hydraulic cylinder 304. The provision of the guide rod 307 can prevent the side rollers 306 from getting stuck when moving with the double-headed hydraulic cylinder 304.

[0057] In addition, it should be noted that in order to prevent jamming between the tail of the strip and the edge roller 306 during transmission, the edge roller 306 can be rotatably connected to the sliding support 308, and in order to prevent the edge roller 306 from falling off the sliding support 308, a pressure plate 309 is provided on the side of the edge roller 306 away from the frame seat 301. The pressure plate 309 can be fixed to the sliding support 308 by bolts, and the edge roller 306 is blocked by the pressure plate 309.

[0058] Side wall brackets 310 rotatably connected to the guide rod 307 are provided at both ends of the frame base 301 , and the side wall brackets 310 serve as auxiliary supports for the guide rod 307 .

[0059] In addition, in order to prevent iron chips on the strip steel 100 to be rewound from falling onto the guide rod 307, thereby affecting the normal operation of the guide rod 307, a dust cover can be set on the frame seat 301 above the guide rod 307 to receive the iron chips falling from the strip steel 100 to be rewound.

[0060] The frame seat 301 can be driven to swing by the swing hydraulic cylinder 312, so that the middle roller 303 is pressed on the plate surface of the tail of the strip, and the side roller 306 can push the side of the strip under the drive of the double-head hydraulic cylinder 304, thereby adjusting the centering of the tail of the strip.

[0061] The multifunctional tail-holding rollers of this embodiment not only hold the tail of the strip tight and prevent it from loosening, but more importantly, guide and align the strip as it enters the coiler's reel jaws. Proportional valves control hydraulic cylinders to adjust the opening (i.e., the distance between the side rollers 306) and the centering of the side rollers 306, depending on the strip width. During operation, the left and right side rollers 306 are driven to preset the hydraulic cylinder strokes based on the desired strip width. The control system sets the stroke parameters, and displacement control is achieved using MTL3 magnetostrictive displacement sensors mounted on the cylinders. This sensor utilizes the strain pulse signal generated by the intersection of two different magnetic fields, and then calculates the time period required for this signal to be detected, thereby accurately determining the position. During tail-swinging operation, the left and right side rollers 306 are each driven by two hydraulic cylinders to move toward the center to their aligned positions. After winding is completed, the side rollers 306 are rapidly opened by the hydraulic cylinders to their maximum opening and ready for standby.

[0062] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications shall fall within the scope of protection of the claims of the present invention.

Claims

1. A method for adjusting the tower shape of the outer ring of a steel coil, characterized in that: The following steps are involved: Step 0: Use a multifunctional tail pressing roller, which includes a frame seat installed at the output end of the swing hydraulic cylinder of the tail pressing roller device, and an intermediate roller and a centering mechanism installed on the frame seat. The centering mechanism includes: At least one pair of side rollers on both sides of the strip tail on the coiler drum and a pair of telescopic assemblies connected between each pair of side rollers. Each pair of side rollers is driven by the pair of telescopic assemblies to clamp the side edges of the strip tail and align them with the center line of the rewinding equipment. The opening degree of the centering mechanism is determined according to the width of the strip produced, thereby determining the stroke of the telescopic assembly. The stroke of the telescopic assembly can make the side rollers of the centering mechanism reach the set centering position; Step 1: When the strip steel is wound on the coiler drum for the remaining N turns, the rewinding equipment slows down to the threading speed and the strip steel enters the tail swinging state; Step 2: During the strip spinning process, the bending rollers of the rewinding equipment press down on the strip to prevent destructive strip spinning caused by misoperation. Step 3: Before the tail of the strip passes through the tension device, the swing hydraulic cylinder of the tail pressing roller device swings downward, so that the middle roller of the multifunctional tail pressing roller presses the steel coil; Step 4: When the strip is completely wound on the coiler drum, the centering mechanism on the multifunctional tail roller will center the N turns of the strip tail; Step 5: After the alignment is completed, the unloading car rises and presses the tail of the steel coil with contact pressure; Step 6: After the tail of the strip is in a stable state, the bending roller and the multifunctional tail roller are lifted at the same time, and the centering mechanism is driven by the telescopic assembly to the maximum opening and waits; Step 7: The reel shrinks, the jaws open, and the unloading vehicle lifts the steel coil to ensure that the inner ring of the steel coil is separated from the outer surface of the reel; Step 8: The unloading car pulls the steel coil away from the reel in the direction away from the reel to unload the coil.

2. The method for adjusting the outer ring tower shape of a steel coil according to claim 1, characterized in that: 1≤N≤3。 3. The method for adjusting the outer ring tower shape of a steel coil according to claim 1, characterized in that: In step 4, the centering mechanism on the multifunctional tail pressure roller centers the N turns of the tail of the belt, including: each pair of edge rollers is driven by the telescopic assembly to move toward the center to the set centering position, and at the same time the reel rotates 1-2 turns in the winding direction to eliminate the tower shape of the outer ring of the steel coil.

4. The method for adjusting the outer ring tower shape of a steel coil according to claim 1, characterized in that: An intermediate roller shaft is provided on the frame seat, and an intermediate roller is installed on the intermediate roller shaft. The intermediate roller is used to press the plate surface of the tail of the strip steel.

5. The method for adjusting the outer ring tower shape of a steel coil according to claim 1, characterized in that: Each pair of telescopic components is fixed on the middle beam seat of the frame seat. A guide rod parallel to the transmission direction of the telescopic component is provided on the frame seat. Sliding supports are slidably connected to both ends of the guide rod. The two side rollers are respectively connected to the corresponding sliding supports, and the sliding supports are respectively connected to the output ends of the telescopic components.

6. The method for adjusting the outer ring tower shape of a steel coil according to claim 1, characterized in that: The side rollers are high-density rubber rollers.

7. The method for adjusting the outer ring tower shape of a steel coil according to claim 5, characterized in that: The side rollers are rotatably connected to the sliding supports.

8. The method for adjusting the outer ring tower shape of a steel coil according to claim 7, characterized in that: In addition, a pressing plate fixed on the sliding support is provided on the side of the side roller away from the frame seat.

9. The method for adjusting the outer ring tower shape of a steel coil according to claim 3, characterized in that: The telescopic component is a hydraulic cylinder, and the hydraulic cylinder adopts a proportional valve to control the stroke.

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