A magnetic jaw device for a cold rolled strip steel coiler mandrel

Abstract

This invention discloses a magnetic jaw device for a cold-rolled strip steel coiler drum. It is mounted on a drum assembly, which includes multiple circumferentially arranged sector plates. One sector plate has a groove along the axial direction of the drum assembly. The device includes: a magnetic attraction component embedded in the groove, comprising an upper permanent magnet and a lower electromagnet, the polarity of which can be switched to cancel or enhance the magnetic field of the permanent magnet; a groove on the permanent magnet for positioning the strip head; and a pull-down component. By using the groove and pull-down component, during the initial winding of the strip, as the drum assembly rolls, the groove positions the strip head. The strip head then abuts against the pull-down component, triggering it to bend the strip head into the groove. This triggers the magnetic attraction component to attract the strip head, thus embedding it into the groove without affecting subsequent strip winding.

Description

Technical Field

[0001] This invention relates to the field of coiling machine technology, and more specifically to a magnetic jaw device for the coil of a cold-rolled strip steel coiling machine. Background Technology

[0002] In cold-rolled strip steel production, the coiler is the core equipment, its function being to coil the rolled strip steel into regular steel coils. Currently, coiler drums generally use mechanical or hydraulic jaws to clamp the strip head. These jaws generate mechanical clamping force through a complex motion mechanism when the drum expands. Obviously, this method has the following significant drawbacks: First, the mechanical jaws clamp and bend the strip head, resulting in permanent bending. The bent strip head will cause the steel coil to bulge, and in severe cases, it must be cut off in subsequent processes, leading to material waste and a decrease in yield. Second, under high-speed coiling and high tension, the bent strip head will cause localized indentations on the strip surface, seriously affecting the surface quality of high-grade cold-rolled sheets and causing a large amount of scrap. Third, the mechanical structure contains a large number of moving parts, which are prone to wear, oil leakage, and jamming under harsh working conditions, resulting in a high failure rate, a large workload for equipment maintenance, and a decrease in production efficiency.

[0003] Patent document CN219253704U discloses an adsorption-assisted steel strip coiling device, including a steel strip conveying mechanism and a coiling machine. The steel strip conveying mechanism includes a pinch roller and a magnetic guide plate rotatably mounted below one side of the pinch roller. The coiling machine is located on one side of the steel strip conveying mechanism and has an expanding and contracting drum and a main arm rotatably encircling the circumference of the expanding and contracting drum. A rubber tube is sleeved on the expanding and contracting drum, and a strong magnet is installed on the circumference of the rubber tube to attract the steel strip head to the surface of the rubber tube. An auxiliary coiling belt is rotatably mounted on the main arm. This utility model can solve problems such as coiling and pinching of stacked strips and upward tilting of the strip head during conveying, and eliminate problems such as steel strip wrinkling, deviated winding, and even excessive stopping time, thereby improving the quality and aesthetics of the coiled product.

[0004] It is evident that magnetic fixing can prevent permanent bending of the strip head during the fixing process. However, due to the presence of sharp edges when the strip head is cut, indentations may still occur on the inner side of the first turn of the strip when it is attached to the surface of the drum for winding. Therefore, a magnetic jaw device for the drum of a cold-rolled strip steel coiler is urgently needed to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a magnetic jaw device for the drum of a cold-rolled strip steel coiler, in order to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A magnetic jaw device for a cold-rolled strip steel coiler drum is provided, which is mounted on a drum assembly. The drum assembly includes multiple circumferentially arranged sector plates, one of which has a groove along the axial direction of the drum assembly. The device includes: a magnetic attraction component embedded in the groove, comprising an upper permanent magnet and a lower electromagnet, the polarity of which can be switched to cancel or enhance the magnetic field of the permanent magnet; a groove disposed on the permanent magnet for positioning the strip head; and a pull-down component disposed on the drum assembly for pulling down and bending the strip head into the groove when the drum assembly rolls to position the strip head in the groove, while simultaneously triggering the magnetic attraction component to attract the strip head.

[0008] Preferably, the rotating base is provided with a power supply system for supplying power to the electromagnet, the power supply system including carbon brushes mounted on the rotating base and conductive slip rings coaxially connected to the drum assembly.

[0009] Preferably, one end of the drum assembly is provided with a rotating seat, and the drum assembly can switch between forward and reverse rotation. When the drum assembly rotates forward, it is used to take in the steel strip, and when the drum assembly rotates in reverse, it is used to fix the head of the steel strip. When the head of the steel strip is attracted into the groove, the drum assembly automatically switches from reverse rotation to forward rotation.

[0010] Preferably, the fan-shaped plate with the groove has multiple storage slots equidistantly arranged along one side of the groove, and the pull-down component is arranged in the storage slot.

[0011] Preferably, the pull-down assembly includes a control rod movably disposed within a storage slot, a pull-down component disposed on the control rod, a first sliding groove matching the control rod disposed within a sector plate, a displacement block movably disposed within the storage slot, and a guide component movably passing through the control rod disposed on the displacement block.

[0012] Preferably, the sector plate is provided with a second slide groove that connects to the first slide groove, the storage groove is movably provided with a slide block, the displacement block is elastically movably connected to the slide block, and the drum assembly is provided with a linkage component for controlling the movement of the slide block. During the reverse rotation of the drum assembly, the slide block moves to one end of the movement range close to the groove, and during the forward rotation of the drum assembly, the slide block moves to one end of the movement range away from the groove.

[0013] Preferably, the linkage assembly includes a linkage rod movably disposed within a sector plate, a sliding pin disposed on the linkage rod, an inclined groove on the slide block that matches the sliding pin, an elastic element disposed in the receiving groove that connects to the side of the slide block away from the groove, one end of the linkage rod movably extending into the rotating seat, and an abutment assembly for controlling the movement of the linkage rod disposed within the rotating seat.

[0014] Preferably, the abutting assembly includes a mother rod disposed at one end of the linkage rod near the rotating seat, an abutting rod elastically disposed at the end of the mother rod, the end of the abutting rod being configured as a ball head, an annular groove disposed within the rotating seat, and an arc-shaped track disposed within the annular groove matching the ball head of the abutting rod. During the reversing process of the drum assembly, the ball head of the abutting rod slides along the arc-shaped track to push the mother rod axially away from the rotating seat. During the forward rotation of the drum assembly, the ball head of the abutting rod moves out of alignment with the arc-shaped track.

[0015] Preferably, the lower end of the guide is hinged to the displacement block, and the inner wall of the receiving groove is provided with a limiting component for limiting the rotation of the guide. After the control rod moves to the end of the second slide groove away from the groove, the limiting component cancels the limiting.

[0016] Preferably, the limiting component includes a limiting groove provided on the inner wall of the receiving groove, and a semi-circular block that is movably embedded in the limiting groove is provided at the rotating shaft end of the guide member. The end of the limiting groove away from the embedded groove is raised, and the semi-circular block can only rotate at the raised end of the limiting groove.

[0017] In the above technical solution, the beneficial effects of the present invention are:

[0018] The magnetic jaw device for the drum of a cold-rolled strip steel coiler uses a groove and a pull-down assembly. During the initial winding of the steel strip, as the drum assembly rolls, the groove is positioned between the strip head and the groove. The strip head then comes into contact with the pull-down assembly, triggering the pull-down assembly to bend the strip head into the groove. This triggers the magnetic attraction assembly to attract the strip head. This not only accurately attracts the strip head onto the drum surface but also embeds it in the groove, preventing it from affecting subsequent winding and avoiding indentations during winding, thus improving the winding quality of the steel strip.

[0019] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this disclosure.

[0020] This application provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a front cross-sectional view of an embodiment of the stop block of the present invention;

[0024] Figure 3 This is a frontal cross-sectional view of the steel strip head after adsorption in an embodiment of the present invention.

[0025] Figure 4 This is a front cross-sectional view of the storage slot structure of the present invention;

[0026] Figure 5 For the present invention Figure 4 Enlarged structural diagram at point A;

[0027] Figure 6 This is a frontal cross-sectional view of the pull-down component of the present invention when it is fully extended.

[0028] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point B;

[0029] Figure 8 This is a frontal cross-sectional structural diagram of the pull-down component positioning steel strip head of the present invention;

[0030] Figure 9 For the present invention Figure 8 Enlarged structural diagram at point C;

[0031] Figure 10 This is a frontal cross-sectional view of the pull-down component of the present invention when it is fully retracted.

[0032] Figure 11 For the present invention Figure 10 Enlarged structural diagram at point D;

[0033] Figure 12 This is a frontal cross-sectional view of the annular groove of the present invention;

[0034] Figure 13 This is a side cross-sectional view of the present invention.

[0035] Figure 14 For the present invention Figure 13 Enlarged structural diagram at point E;

[0036] Figure 15 For the present invention Figure 13 Enlarged structural diagram at point F;

[0037] Figure 16 This is a schematic diagram of the internal structure of the arc-shaped plate of the present invention;

[0038] Figure 17 For the present invention Figure 16A magnified structural diagram of point G in the middle.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1. Sector plate; 2. Slot; 3. Permanent magnet; 4. Electromagnet; 5. Groove; 6. Rotary seat; 7. Storage slot; 8. Control rod; 9. Pull-down component; 10. First slide groove; 11. Displacement block; 12. Guide component; 13. Second slide groove; 14. Slide seat; 15. Linkage rod; 16. Sliding pin; 17. Inclined slide groove; 18. Elastic component; 19. Mother rod; 20. Abutment rod; 21. Annular groove; 22. Arc track; 23. Limiting groove; 24. Semicircular block; 25. Carbon brush; 26. Conductive slip ring. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0042] Please see Figure 1-17 This invention provides a magnetic jaw device for a cold-rolled strip steel coiler drum, which is mounted on a drum assembly. The drum assembly includes multiple circumferentially arranged sector plates 1, one of which has a groove 2 along the axial direction of the drum assembly. The groove 2 includes: a magnetic attraction component embedded in the groove 2, comprising an upper permanent magnet 3 and a lower electromagnet 4, the polarity of which can be switched to cancel or enhance the magnetic field of the permanent magnet 3; a groove 5 mounted on the permanent magnet 3 for positioning the strip head; and a pull-down component mounted on the drum assembly for pulling down and bending the strip head into the groove 5 when the drum assembly rolls to position the strip head in the groove 5, while simultaneously triggering the magnetic attraction component to attract the strip head.

[0043] Specifically, a rotating seat 6 is provided at one end of the drum assembly. The drum assembly can switch between forward and reverse rotation. When the drum assembly rotates forward, it is used to take in the steel strip. When the drum assembly rotates in reverse, it is used to hold the steel strip head. When the steel strip head is attracted into the groove 5, the drum assembly automatically switches from reverse rotation to forward rotation. The forward and reverse rotation switching of the drum assembly is controlled by a servo system. Specifically, when the steel strip head is attracted into the groove 5 by the magnetic attraction component, the servo system controls the drum assembly to switch from reverse rotation to forward rotation. In addition, when a new steel strip winding operation is performed, the servo system controls the drum assembly to reverse rotation again. The drum assembly also includes a core body. Each sector plate 1 is symmetrically connected to the outside of the core body. A lock head is provided at one end of the core body, and a drive gear is provided at the other end. Preferably, there are four sector plates 1, and each sector plate 1 forms a cylindrical shape. The groove 2 is elongated along the axial direction of the drum assembly. The permanent magnet 3 uses high-performance rare-earth permanent magnet materials, such as neodymium iron boron, to provide stable and strong basic static magnetic force. The electromagnet 4 consists of a high-permeability iron core and a high-temperature resistant insulated coil, which generates a controllable magnetic field. The electromagnet 4 is an electro-permanent magnet, which retains its magnetism when the power is off, eliminating the need for prolonged power supply, greatly reducing heat generation, and saving energy. The rotating base 6 is equipped with a power supply system for the electromagnet 4. The power supply system includes carbon brushes 25 mounted on the rotating base 6 and a conductive slip ring 26 coaxially connected to the drum assembly. The coil of the electromagnet 4 is connected to the conductive slip ring 26 through a high-temperature resistant wire, realizing the transmission of electrical energy from the external static control cabinet to the rotating electromagnet 4. The groove 5 is located on one side of the permanent magnet 3 along the forward rotation direction of the drum assembly. The depth of the groove 5 is greater than the thickness of the steel strip head, and the length of the groove 5 along the axial direction of the drum assembly is greater than the width of the steel strip. The pull-down assembly guides the steel strip head to align with and bend into the groove 5, thus requiring relatively little pulling force. Once the pull-down assembly pulls the steel strip head down to contact the inner bottom surface of the groove 5, the magnetic attraction assembly triggers enhanced magnetism to attract the steel strip. In practical use, the steel strip head extends an appropriate length above the highest position of the drum assembly. At this point, the drum assembly reverses its rotation, causing the groove 5 to roll and align below the steel strip head. The steel strip head then comes into contact with the pull-down assembly, triggering it to pull the steel strip head down and bend it into the groove 5. The magnetic attraction assembly then attracts the steel strip head, allowing it to accurately embed into the groove 5. Finally, the drum assembly switches to forward rotation for winding. This not only accurately attracts the steel strip head onto the drum surface but also embeds it into the groove 5 without affecting subsequent steel strip winding, preventing indentations during winding and improving the winding quality.

[0044] Compared with the prior art, the magnetic jaw device for the drum of a cold-rolled strip steel coiler proposed in this embodiment of the invention, by setting a groove 5 and a pull-down assembly, allows the strip head to be positioned with the groove 5 as the drum assembly rolls during the initial winding of the steel strip. Then, the pull-down assembly pulls down and bends the strip head into the groove 5, while simultaneously triggering the magnetic attraction assembly to attract the strip head. Thus, not only can the strip head be accurately attracted to the surface of the drum, but the strip head is also embedded in the groove 5 so as not to affect the subsequent winding of the steel strip, avoiding the formation of indentations during the winding of the steel strip and improving the winding quality of the steel strip.

[0045] Furthermore, the positioning process between the steel strip head and the groove 5 can be simplified by replacing the pull-down assembly with a stop block that elastically extends and retracts on the surface of the sector plate 1, with the stop block positioned close to the groove 5. In actual use, the steel strip head extends an appropriate length to correspond to the highest position above the drum assembly. At this time, the drum assembly reverses, causing the groove 5 to roll to correspond to the area below the steel strip head. Simultaneously, the steel strip head abuts against the stop block, triggering the magnetic attraction assembly to attract the steel strip head, allowing it to accurately embed into the groove 5. Finally, the drum assembly switches to forward rotation for winding. During the winding process, the first turn of steel strip automatically compresses the stop block elastically, thereby accurately positioning the steel strip head between itself and the groove 5 and embedding it into the groove 5 to avoid affecting subsequent steel strip winding and preventing indentations during winding. However, in this simplified embodiment, a gap remains between the steel strip head and the inner wall of the groove 5 during the process of adsorbing it into the groove 5. Due to the thickness of the steel strip, it is difficult to bend. At this time, in order to successfully adsorb the steel strip head into the groove 5, the magnetic attraction force also needs to bend the steel strip head, which requires a significant improvement in the specifications and quality of the electromagnetic force generating equipment and circuitry. Therefore, the following pull-down component is set to position the steel strip head and assist in bending it.

[0046] As a preferred technical solution of this embodiment, a plurality of storage slots 7 are provided at equal intervals along one side of the groove 5 on the fan-shaped plate 1 with the groove 5. The pull-down component is disposed in the storage slot 7. Specifically, the plurality of storage slots 7 correspond to a plurality of pull-down components. The plurality of pull-down components are evenly distributed, thereby applying force evenly to the steel strip head to ensure that the steel strip head is stably positioned in the groove 5.

[0047] In another embodiment of the present invention, the pull-down assembly includes a control rod 8 movably disposed within a storage groove 7, a pull-down member 9 disposed on the control rod 8, a first sliding groove 10 matching the control rod 8 disposed within a sector plate 1, a displacement block 11 elastically disposed within the storage groove 7, and a guide member 12 movably penetrating the control rod 8 disposed on the displacement block 11. Specifically, the control rod 8 is a cylindrical rod with its axial direction parallel to the axial direction of the drum assembly. The pull-down members 9 of each group of pull-down assemblies are connected to the same control rod 8 to ensure synchronized movement. A pressing part and an abutting part located between the control rod 8 and the pressing part are disposed at the end of the pull-down member 9 away from the control rod 8. The pressing part and the abutting part are stepped, and the abutting part is used for positioning. When the steel strip head is engaged, it directly abuts against the steel strip head, and the pressing part is positioned above the steel strip head. The end of the first groove 10 closest to the groove 5 is farther from the axis of the drum assembly than the other end. This causes the pull-down member 9 to move closer to the axis of the drum assembly when the control rod 8 moves away from the groove 5 within the first groove 10, thereby pressing the steel strip head into the groove 5. The elastic force on the displacement block 11 keeps it inclined to approach the groove 2. The guide member 12 is plate-shaped and is parallel to and passes through the axis of the control rod 8. The guide member 12 is used to limit the rotation angle of the pull-down member 9 during its movement, ensuring that the pull-down member 9 presses down on the steel strip head. This achieves the action of the pull-down member 9 pressing down on the steel strip head. After the steel strip head is positioned and fixed by the magnetic attraction component, the pull-down member 9 needs to be stored in the storage groove 7 to avoid protruding from the surface of the drum assembly.

[0048] As a preferred embodiment, the sector plate 1 is provided with a second slide groove 13 that connects to the first slide groove 10. A slide block 14 is movably disposed in the receiving groove 7. The displacement block 11 is elastically and movably connected to the slide block 14. The drum assembly is provided with a linkage component for controlling the movement of the slide block 14. During the reversing process of the drum assembly, the slide block 14 moves to one end of the range of motion close to the groove 2. During the forward rotation of the drum assembly, the slide block 14 moves to one end of the range of motion away from the groove 2. Specifically, the two ends of the second slide groove 13 extend in a direction parallel to the tangential direction of the pull-down member 9 when it leaves the groove 5, corresponding to the position of the outer surface of the sector plate 1. In other words, the direction of the control rod 8 in the second slide groove 13 causes the pull-down member 9 to move tangentially along the outer surface of the sector plate 1, so as not to interfere with the steel strip head in the groove 5. The second slide groove 13 matches the control rod 8. The slide block 14 moves in a straight line in the receiving groove 7 to approach Or slide away from the groove 2; the slide block 14 is provided with a notch, the displacement block 11 is provided in the notch, and the side of the displacement block 11 away from the groove 2 is provided with a guide rod. The guide rod moves through the side wall of the notch in a direction parallel to the movement direction of the slide block 14. A spring is sleeved on the guide rod to prevent the displacement block 11 from moving away from the groove 2; the triggering range of the linkage component corresponds to the arc range of the groove 5 driven by the reversing process of the drum assembly that is close to the bottom of the steel strip head, and also corresponds to the arc range of the groove 5 driven by the forward rotation process of the drum assembly that is away from the bottom of the steel strip head. Furthermore, during the reversing process of the drum assembly, before the steel strip head abuts against the pull-down piece 9, the linkage component will link the slide block 14 to the end of the movement range close to the groove 2, thereby satisfying the triggering function of the pull-down piece 9. During the reversing process of the drum assembly, before the steel strip is wound around once, the linkage component will link the slide block 14 to the end of the movement range away from the groove 2.

[0049] As a preferred embodiment, the linkage assembly includes a linkage rod 15 movably disposed within the sector plate 1, a sliding pin 16 disposed on the linkage rod 15, an inclined groove 17 matching the sliding pin 16 disposed on the slide block 14, an elastic element 18 connected to the side of the slide block 14 away from the recess 2 disposed in the receiving groove 7, one end of the linkage rod 15 movably extending into the rotating seat 6, and an abutment assembly controlling the movement of the linkage rod 15 disposed in the rotating seat 6. Specifically, the extension direction of the linkage rod 15 is parallel to the axial direction of the drum assembly, and the linkage rod 15 only moves along its extension direction; the inclined groove 17 is disposed on the opposite side of the displacement block 11 on the slide block 14, and the inclined groove 17 is close to the recess. One end of the groove 2 is positioned closer to the rotating seat 6 than the other end; the elastic element 18 is preferably a spring, which holds the slide 14 in place, thereby causing the slide 14 to automatically move towards the end of its range of motion away from the groove 2 without being affected by external force; the abutment component is used to control the movement of the linkage rod 15. During the reversing process of the drum assembly, the abutment component can be triggered, causing the linkage rod 15 to move away from the rotating seat 6, and then move the slide 14 closer to the groove 2 through the sliding pin 16 and the inclined slide groove 17. During the forward rotation of the drum assembly, the abutment component is not triggered, and the slide 14 automatically moves towards the end of its range of motion away from the groove 2 under the action of the elastic element 18 and maintains its position.

[0050] As a preferred embodiment, the abutting assembly includes a female rod 19 disposed near one end of the linkage rod 15 close to the rotating seat 6. An abutting rod 20 is elastically and movably disposed at the end of the female rod 19, and the end of the abutting rod 20 is a ball head. An annular groove 21 is provided inside the rotating seat 6, and an arc-shaped track 22 matching the ball head of the abutting rod 20 is provided within the annular groove 21. During the reversing process of the drum assembly, the ball head of the abutting rod 20 slides along the arc-shaped track 22 to push the female rod 19 axially away from the rotating seat 6. During the forward rotation process of the drum assembly… In the process, the ball head of the abutment rod 20 is misaligned with the arc-shaped track 22. Specifically, the end of the mother rod 19 is provided with a movable cavity, and one end of the abutment rod 20 is movably inserted into the movable cavity. Another spring is provided in the movable cavity to connect the abutment rod 20. The part of the abutment rod 20 extending out of the movable cavity is provided with a convex ring. When the abutment rod 20 is not subjected to external force, the convex ring abuts against the end of the mother rod 19. The diameter of the ball head is larger than the diameter of the rod part of the abutment rod 20. The arc-shaped track 22 includes a ramp section and a straight section. During the reversal process of the drum assembly, when the groove 5 is in contact with the... When the section near the head of the steel strip moves in an arc, the abutment rod 20 moves with the drum assembly, first passing through the ramp section and then the straight section. The straight section is positioned closer to the fan-shaped plate 1. Thus, during the reversal of the drum assembly, the abutment rod 20 first compresses and pushes against the ramp section of the arc-shaped track 22, causing the linkage rod 15 to move away from the rotating seat 6. Then, when the groove 5 approaches the head of the steel strip, the abutment rod 20 abuts against the straight section of the arc-shaped track 22, keeping the linkage rod 15 away from the rotating seat 6. The arc-shaped track 22 has an opening in the middle. The gap matching the rod part of the abutment rod 20 allows the abutment rod 20 to move with the drum assembly during forward rotation, passing through the gap in the middle of the arc track 22. As a result, it will not push the linkage rod 15. In addition, when the abutment rod 20 passes the end of the ramp section of the arc track 22, the abutment rod 20 will pull the spring to move smoothly so as to pass through the abutment rod 20 without causing motion interference. During reverse rotation of the drum assembly, the ball head of the abutment rod 20 will normally compress against the arc track 22.

[0051] The above embodiment achieves the pulling down piece 9 away from the top of the groove 5 by passively relying on the rotation of the roll assembly, without the need for an additional power source, but the pulling down piece 9 is still outside the storage slot 7.

[0052] In another embodiment of the present invention, the lower end of the guide member 12 is hinged to the displacement block 11. The inner wall of the receiving groove 7 is provided with a limiting component for limiting the rotation of the guide member 12. After the control rod 8 moves to the end of the second slide groove 13 away from the embedded groove 2, the limiting component cancels the limiting. Specifically, the limiting component includes a limiting groove 23 provided on the inner wall of the receiving groove 7. The rotating shaft end of the guide member 12 is provided with a semi-circular block 24 that is movably embedded in the limiting groove 23. The end of the limiting groove 23 away from the embedded groove 2 is raised. The semi-circular block 24 can only rotate at the raised end of the limiting groove 23. The arc surface of the semi-circular block 24 is provided on the side away from the pull-down member 9. The height of the part of the limiting groove 23 near the embedded groove 2 matches the radius of the semi-circular block 24. The height of the raised end of the limiting groove 23 matches the diameter of the semi-circular block 24. When the semi-circular block 24 moves in the part of the limiting groove 23 near the embedded groove 2, it does not rotate, and the guide member 12 remains fixed relative to the displacement block 11. In practical use, when the slide block 14 moves away from the groove 2 under the elastic pull of the elastic member 18, the control rod 8 moves with the slide block 14 to the end of the second slide groove 13 away from the groove 2 under the drive of the displacement block 11 and the guide member 12. At this time, the semicircular block 24 moves to the raised end of the corresponding limiting groove 23. As the slide block 14 continues to move, the control rod 8 stops moving, while the slide block 14 continues to move under the pull of the elastic member 18. The displacement block 11 also moves synchronously to displace relative to the control rod 8, thereby causing the guide member 12 to rotate towards the groove 2, which in turn drives the control rod 8 to rotate. The control rod 8 then drives the pull-down member 9 to rotate and fold into the storage groove 7, realizing the folding and storage of the pull-down member 9. At the same time, the elastic potential energy on the elastic member 18 is fully released. During the subsequent steel strip winding process, the elastic member 18 relaxes, extending its service life. In another preferred embodiment, When the slide block 14 moves to the end of the range of motion away from the groove 2, the control rod 8 moves to the end of the second slide groove 13 away from the groove 2. The elastic element 18 can be fully released, and the slide block 14 no longer moves. At this time, the pull-down part 9 can be passively pressed into the storage groove 7 by the steel strip being wound around the surface of the roller assembly. During this passive storage process, the pull-down part 9 is pressed and drives the control rod 8 to rotate, which in turn links the displacement block 11 and the guide 12, causing the displacement block 11 to push the spring connected to it to move. This process can also realize the storage of the pull-down part 9. However, during the subsequent steel strip winding process, the spring connected to the displacement block 11 is under stress, which will reduce the service life of the spring. In addition, when the slide block 14 moves in the opposite direction, the semicircular block 24 can re-enter the part of the limiting groove 23 close to the groove 2, thereby causing the guide 12 to reverse to restore the state of the pull-down part 9 extending out of the storage groove 7. Then the pull-down part 9 moves closer to the groove 5.

[0053] As a preferred technical solution of the above embodiments, when the control rod 8 moves from the first slide groove 10 to the position connecting the second slide groove 13, the polarity of the electromagnet 4 is switched to enhance the magnetic field of the permanent magnet 3. Specifically, a sensor is provided at the connection position between the first slide groove 10 and the second slide groove 13 to detect when the control rod 8 enters the second slide groove 13 from the first slide groove 10. After detection, the sensor can be processed by the servo system to control the polarity switching of the electromagnet 4. By triggering the polarity switching of the electromagnet 4 to enhance the magnetic field of the permanent magnet 3 when the control rod 8 moves from the first slide groove 10 to the position connecting the second slide groove 13, it is achieved that when the pull-down piece 9 just positions and presses the steel strip head into the groove 5, the steel strip head will be attracted and fixed in the groove 5 in time. Furthermore, during the reversal of the drum assembly, the pull-down piece 9 interacts with the steel strip head, causing the steel strip head to bend and enter the groove 5. Then, the polarity of the electromagnet 4 is switched to enhance the magnetic field of the permanent magnet 3, so that the steel strip head is accurately attracted into the groove 5. Immediately afterwards, the servo system controls the drum assembly to switch to forward rotation, thereby smoothly winding the steel strip. After the steel strip is wound up, the servo system controls the drum assembly to stop rotating, allowing the steel strip roll to be discharged. Then, the servo system controls the drum assembly to switch to reverse rotation, and the steel strip is positioned and wound up again.

[0054] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A magnetic jaw device for a coil of a cold-rolled strip steel coiling machine, wherein the device is mounted on a coil assembly, the coil assembly comprising a plurality of circumferentially arranged sector plates (1), one of which has a groove (2) formed along the axial direction of the coil assembly, characterized in that, include: The magnetic attraction component is embedded in the groove (2), which includes an upper permanent magnet (3) and a lower electromagnet (4). The polarity of the electromagnet (4) can be switched to cancel or enhance the magnetic field of the permanent magnet (3). The groove (5) is set on the permanent magnet (3) and is used to position the steel strip head; The pull-down assembly is set on the drum assembly and is used to pull down and bend the steel strip head into the groove (5) when the drum assembly rolls to position the steel strip head in the groove (5), and at the same time trigger the magnetic attraction assembly to attract the strip head.

2. The magnetic jaw device for a cold-rolled strip steel coiler drum according to claim 1, characterized in that, The drum assembly is provided with a rotating seat (6) at one end. The drum assembly can switch between forward and reverse rotation. When the drum assembly rotates forward, it is used to collect the steel strip. When the drum assembly rotates in reverse, it is used to fix the head of the steel strip. When the head of the steel strip is attracted into the groove (5), the drum assembly automatically switches from reverse rotation to forward rotation.

3. The magnetic jaw device for a cold-rolled strip steel coiler drum according to claim 2, characterized in that, The rotating base (6) is provided with a power supply system for supplying power to the electromagnet (4). The power supply system includes a carbon brush (25) installed on the rotating base (6) and a conductive slip ring (26) coaxially connected to the drum assembly.

4. The magnetic jaw device for a cold-rolled strip steel coiler drum according to claim 2, characterized in that, On the fan-shaped plate (1) with groove (5), multiple storage slots (7) are provided at equal intervals along one side of the groove (5), and the pull-down component is set in the storage slot (7).

5. The magnetic jaw device for a cold-rolled strip coiler drum according to claim 4, characterized in that, The pull-down assembly includes a control rod (8) that is movably disposed in a storage slot (7), a pull-down member (9) that is disposed on the control rod (8), a first sliding groove (10) that matches the control rod (8) that is disposed in a fan-shaped plate (1), a displacement block (11) that is elastically movably disposed in the storage slot (7), and a guide member (12) that movably passes through the control rod (8) that is disposed on the displacement block (11).

6. The magnetic jaw device for a cold-rolled strip steel coiler drum according to claim 5, characterized in that, The sector plate (1) is provided with a second slide groove (13) that connects with the first slide groove (10). The storage groove (7) is provided with a slide block (14). The displacement block (11) is elastically connected to the slide block (14). The drum assembly is provided with a linkage component for controlling the movement of the slide block (14). During the reverse rotation of the drum assembly, the slide block (14) moves to one end of the range of motion close to the groove (2). During the forward rotation of the drum assembly, the slide block (14) moves to one end of the range of motion away from the groove (2).

7. The magnetic jaw device for a cold-rolled strip coiler drum according to claim 6, characterized in that, The linkage assembly includes a linkage rod (15) movably disposed within a sector plate (1), a sliding pin (16) disposed on the linkage rod (15), an inclined groove (17) matching the sliding pin (16) disposed on the slide block (14), an elastic element (18) connected to the side of the slide block (14) away from the groove (2) disposed in the storage groove (7), one end of the linkage rod (15) movably extends into the rotating seat (6), and an abutment assembly controlling the movement of the linkage rod (15) is disposed in the rotating seat (6).

8. The magnetic jaw device for a cold-rolled strip steel coiler drum according to claim 7, characterized in that, The abutting assembly includes a mother rod (19) provided at one end of the linkage rod (15) near the rotating seat (6), and an abutting rod (20) elastically movably provided at the end of the mother rod (19). The end of the abutting rod (20) is set as a ball head. An annular groove (21) is provided in the rotating seat (6), and an arc-shaped track (22) matching the ball head of the abutting rod (20) is provided in the annular groove (21). During the reversal of the drum assembly, the ball head of the abutting rod (20) slides along the arc-shaped track (22) to push the mother rod (19) to move axially away from the rotating seat (6). During the forward rotation of the drum assembly, the ball head of the abutting rod (20) and the arc-shaped track (22) are misaligned.

9. The magnetic jaw device for a cold-rolled strip coiler drum according to claim 7, characterized in that, The lower end of the guide (12) is hinged to the displacement block (11). The inner wall of the receiving groove (7) is provided with a limiting component for limiting the rotation of the guide (12). After the control rod (8) moves to the end of the second slide groove (13) away from the groove (2), the limiting component cancels the limiting.

10. The magnetic jaw device for a cold-rolled strip steel coiler drum according to claim 9, characterized in that, The limiting component includes a limiting groove (23) provided on the inner wall of the storage groove (7), and a semi-circular block (24) that is movably embedded in the limiting groove (23) is provided at the rotating end of the guide (12). The end of the limiting groove (23) away from the groove (2) is raised, and the semi-circular block (24) can only rotate at the raised end of the limiting groove (23).

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