Aluminum disc hot rolling method and hot rolling control system

Abstract

This invention discloses a hot rolling method and control system for aluminum discs, relating to the field of aluminum disc technology. The invention includes a hot rolling furnace containing a cylindrical component. A material guiding assembly is fixedly connected to the side of the furnace, and a material guiding power assembly is fixedly installed on the material guiding assembly. Two adjustable-gap pressure rollers are installed within any toothed ring to press the cylindrical component, and the toothed ring drives the pressure rollers to rotate along the outer surface of the cylindrical component, gradually reducing the diameter of the cylindrical component and ensuring stable hot rolling operation. The output of a motor drives a half-gear to rotate, causing a toothed plate to slide back and forth, and a push shaft to move up and down via a bar-shaped rod. Then, the multi-hole arc-shaped tubes at the upper and lower ends of the cylindrical component swing along a cooling pipe through a rotating tube, allowing the cylindrical component with decreasing diameter to cool rapidly in the cooling chamber. This facilitates the winding of the cylindrical component by the inner cylinder, improving the hot rolling efficiency of the aluminum disc.

Description

Technical Field

[0001] This invention relates to the field of aluminum coil technology, specifically to a hot rolling method and hot rolling control system for aluminum coils. Background Technology

[0002] In the hot rolling and coiling production of aluminum coils, the aluminum cylinder is usually heated and then directly hot rolled into a smaller diameter through multiple precision hot rolling passes before being coiled. This requires a conveying power device for the cylinder and a drive device for the multiple precision hot rolling passes, resulting in high equipment investment. Furthermore, the process of reducing the diameter of the cylinder is inefficient. In addition, the reduced-diameter cylinder requires cooling, but conventional cooling devices are difficult to achieve rapid cooling, making it difficult to continuously convey the cylinder and reducing the efficiency of the coiling process. To address these problems, the inventors propose a hot rolling method and hot rolling control system for aluminum coils to solve these issues. Summary of the Invention

[0003] To address the issues of high equipment investment, low efficiency during the cylinder diameter reduction process, and the need for cooling after the cylinder shrinks, which is difficult to achieve with conventional cooling devices, the present invention aims to provide a hot rolling method and control system for aluminum coils.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a hot rolling control system for aluminum coils, including a hot rolling furnace, a cylindrical component disposed inside the hot rolling furnace, a material guiding assembly fixedly connected to the side of the hot rolling furnace, a material guiding power assembly fixedly installed on the material guiding assembly, a plurality of finishing rolling devices driven by the material guiding power assembly, the cylindrical component passing through the finishing rolling device, a reciprocating mechanism driven by the material guiding power assembly, a cooling chamber movably passing through the cylindrical component, two cooling pipes fixedly sleeved in the cooling chamber, each cooling pipe rotatably connected to a rotating pipe, each rotating pipe fixedly provided with a plurality of perforated arc-shaped pipes, the reciprocating mechanism being driven by the perforated arc-shaped pipes, a winding device wound around one end of the cylindrical component, after the cylindrical component is heated in the hot rolling furnace, the cylindrical component is introduced into the plurality of finishing rolling devices for hot rolling by the material guiding power assembly, so that the diameter of the cylindrical component gradually decreases, and then the cylindrical component is rapidly cooled by the perforated arc-shaped pipes that can swing in the cooling chamber, and then wound up by the winding device.

[0005] Preferably, the hot rolling furnace has discharge grooves on both sides, and an exhaust pipe is fixedly installed on the upper surface of the hot rolling furnace. A cylindrical component moves through the discharge grooves, and the cylindrical component in the hot rolling furnace exits through the discharge grooves. The material guiding assembly includes a protective frame, which is fixedly connected to the side of the hot rolling furnace. A single guide roller and a double guide roller are rotatably mounted on the protective frame, and the cylindrical component moves through the space between the double guide rollers. A material guiding power assembly is fixedly connected to the side of the protective frame. When the cylindrical component exits, it moves from the top of the single guide roller, then passes through the space between the double guide rollers and enters the finishing rolling device. The material guiding power assembly includes a motor, which is fixedly connected to a mounting frame. The mounting frame is fixedly connected to the protective frame. Multiple power gears are fixedly connected to the output end of the motor, and each power gear is connected to a finishing rolling device. A vertical plate is rotatably connected to the output end of the motor, and the output end of the motor is connected to a reciprocating mechanism, which drives the multiple power gears to rotate. The corresponding finishing rolling device is rotated to perform hot rolling on the cylindrical part, gradually reducing its diameter. The finishing rolling device includes a gear ring with annular grooves on both sides. A guide ring is slidably connected within the annular grooves, and multiple fixed shafts are fixedly connected to the guide rings. A bracket is fixedly connected to each fixed shaft. Two elliptical blocks are fixedly installed on the inner wall of the gear ring, and multiple positioning holes are opened at both ends of each elliptical block. Bolts are threaded into the positioning holes, and rotating shafts are fixedly connected to the bottom ends of the bolts. Pressure rollers are rotatably connected between the rotating shafts. The gear ring is bolted into different positioning holes, changing the distance between the two pressure rollers, thereby gradually reducing the diameter of the cylindrical part. The gear ring drives the pressure rollers to rotate, further reducing the diameter of the cylindrical part. Two pressure rollers are fixedly installed in any one of the gear rings, with the cylindrical part passing between them. The adjustable-distance pressure rollers rotate along the outer surface of the cylindrical part, rapidly reducing its diameter.

[0006] Preferably, the reciprocating mechanism includes a half-face gear, which is fixedly connected to the output end of the motor. The half-face gear meshes with a toothed plate, and guide blocks are slidably connected to both ends of the toothed plate. The guide blocks are fixedly connected to a vertical plate, and a strip rod is fixedly connected to one end of the toothed plate. The strip rod is driven by a multi-hole arc-shaped tube. The half-face gear drives the toothed plate to reciprocate along the guide blocks, causing the strip rod to drive the multi-hole arc-shaped tube to oscillate. Each multi-hole arc-shaped tube is fixedly equipped with a U-shaped block, and a cross groove is formed on the U-shaped block. A sliding shaft is slidably connected within the cross groove, and the sliding shafts are fixedly connected to each other. A push shaft is fixedly connected, with its bottom end movably penetrating the cooling chamber and fixedly connected to one end of a strip rod. When the push shaft moves up and down, the sliding shaft can slide along the cross groove, causing the porous arc-shaped tube to swing. The winding device includes two outer discs, with an inner cylinder fixedly connected to the inner wall of each outer disc. A cylindrical component is wound around the outer surface of the inner cylinder, and multiple through holes are provided on the inner cylinder. Limiting rods are movably inserted into the through holes, and a drive shaft is fixedly connected to the limiting rods. The cylindrical component is wound around the outer surface of the inner cylinder, and multiple limiting rods at the bottom of the drive shaft are inserted into the through holes, enabling the drive shaft to drive the inner cylinder to rotate.

[0007] A method for hot rolling aluminum coils includes the following steps:

[0008] Step 1: After the cylindrical part is heated in the hot rolling furnace, it is hot rolled by multiple precision rolling devices to reduce its diameter. Then it is wound by an inner cylinder. The two ends of the inner cylinder are fixedly connected to the outer disc, and multiple limit rods at the bottom of the drive shaft are inserted into the through hole to enable the drive shaft to drive the inner cylinder to rotate.

[0009] Step Two: The motor output drives multiple power gears to rotate. Under the action of the bracket, the guide ring makes the corresponding gear ring rotate stably along the guide ring. Then, two elliptical blocks are fixedly installed in any one of the gear rings, and two pressure rollers installed rotatably in the elliptical blocks press the cylindrical part between them. The pressure rollers rotate along the outer surface of the cylindrical part, making the diameter of the cylindrical part smaller. Multiple gear rings are installed in different positioning holes by bolts, so that the distance between the two pressure rollers changes, thereby making the diameter of the cylindrical part gradually smaller. Then, the motor output drives the half-face gear to rotate, so that the tooth plate slides back and forth along the guide block. The push shaft moves up and down back and forth through the bar rod. Then, the multi-hole arc tube at the upper and lower ends of the cylindrical part swings along the cooling pipe through the rotating tube, so that the cylindrical part with the smaller diameter is quickly cooled in the cooling chamber, which facilitates the inner cylinder column to wind the cylindrical part.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0011] 1. Two adjustable pressure rollers are installed in any one of the toothed rings to press the cylindrical part, and the toothed ring drives the pressure rollers to rotate along the outer surface of the cylindrical part, so that the diameter of the cylindrical part gradually decreases, so as to ensure the stable operation of the hot rolling of the cylindrical part.

[0012] 2. The output end of the motor drives the half-gear to rotate, causing the tooth plate to slide back and forth. The push shaft moves up and down back and forth through the bar rod, and then the multi-hole arc tube at the upper and lower ends of the cylindrical part swings along the cooling tube through the rotating tube, so that the cylindrical part with a smaller diameter can be quickly cooled in the cooling chamber, which facilitates the inner cylinder to wind the cylindrical part and improves the hot rolling efficiency of the aluminum disc. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall invention.

[0015] Figure 2 This is a schematic diagram of the hot rolling furnace structure of the present invention.

[0016] Figure 3 This is a schematic diagram of the cooling chamber structure of the present invention.

[0017] Figure 4 The structure of this invention Figure 3 Enlarged diagram of point A in the middle.

[0018] Figure 5 This is a schematic diagram of the precision rolling device of the present invention.

[0019] In the diagram: 1. Hot rolling furnace; 11. Exhaust pipe; 12. Discharge trough; 2. Material guiding power assembly; 21. Motor; 211. Mounting frame; 22. Power gear; 23. Vertical plate; 3. Finishing rolling device; 31. Gear ring; 311. Annular groove; 32. Guide ring; 321. Fixed shaft; 33. Support; 34. Elliptical block; 341. Positioning hole; 35. Bolt; 36. Pressure roller; 361. Rotating shaft; 4. Cooling chamber; 41. Cooling pipe; 42. Rotating tube; 43. Perforated arc-shaped tube; 44. U-shaped block; 441. Cross groove; 45. Sliding shaft; 46. Push shaft; 5. Reciprocating mechanism; 51. Half-face gear; 52. Tooth plate; 53. Guide block; 54. Strip rod; 6. Winding device; 61. Outer disc; 62. Inner cylinder column; 621. Through hole; 63. Drive shaft; 64. Limiting rod; 7. Material guiding assembly; 71. Guard frame; 72. Single guide roller; 73. Double guide roller; 8. Cylindrical part. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] like Figure 1-5 As shown, the present invention provides a hot rolling control system for aluminum coils, including a hot rolling furnace 1, a cylindrical component 8 disposed inside the hot rolling furnace 1, a material guiding assembly 7 fixedly connected to the side of the hot rolling furnace 1, a material guiding power assembly 2 fixedly installed on the material guiding assembly 7, a plurality of finishing rolling devices 3 being drivenly connected to the material guiding power assembly 2, the cylindrical component 8 passing through the finishing rolling device 3, a reciprocating mechanism 5 being drivenly connected to the material guiding power assembly 2, a cooling chamber 4 movably passing through the cylindrical component 8, two cooling pipes 41 fixedly sleeved inside the cooling chamber 4, a rotating pipe 42 rotatably connected to each cooling pipe 41, a plurality of perforated arc-shaped pipes 43 fixedly provided on each rotating pipe 42, the reciprocating mechanism 5 being drivenly connected to the perforated arc-shaped pipes 43, and a winding device 6 wound around one end of the cylindrical component 8.

[0022] By adopting the above technical solution, after the cylindrical part 8 is heated in the hot rolling furnace 1, it is introduced into multiple finishing rolling devices 3 by the material guiding power component 2 for hot rolling, so that the diameter of the cylindrical part 8 gradually decreases. Then, the cylindrical part 8 is rapidly cooled by the multi-hole arc tube 43 that can swing in the cooling chamber 4, and then it is wound up by the winding device 6.

[0023] The hot rolling furnace 1 has discharge grooves 12 on both sides of its surface, and an exhaust pipe 11 is fixedly installed on the upper surface of the hot rolling furnace 1. A cylindrical member 8 is movably inserted into the discharge groove 12.

[0024] By adopting the above technical solution, the cylindrical part 8 in the hot rolling furnace 1 is discharged through the discharge groove 12.

[0025] The material guiding assembly 7 includes a protective frame 71, which is fixedly connected to the side of the hot rolling furnace 1. A single guide roller 72 and a double guide roller 73 are rotatably mounted on the protective frame 71. A cylindrical member 8 is movably passed between the double guide rollers 73. The material guiding power assembly 2 is fixedly connected to the side of the protective frame 71.

[0026] By adopting the above technical solution, when the cylindrical part 8 is discharged, it moves from the top of the single guide roller 72, and then passes through the space between the double guide rollers 73 before entering the finishing rolling device 3.

[0027] The material guiding power assembly 2 includes a motor 21, which is fixedly connected to a mounting frame 211. The mounting frame 211 is fixedly connected to a protective frame 71. The output end of the motor 21 is fixedly connected to a plurality of power gears 22. The power gears 22 are respectively connected to a precision rolling device 3. The output end of the motor 21 is rotatably connected to a vertical plate 23. The output end of the motor 21 is connected to a reciprocating mechanism 5.

[0028] By adopting the above technical solution, the output end of the motor 21 drives multiple power gears 22 to rotate, causing the corresponding precision rolling device 3 to rotate, and then hot rolling is performed on the cylindrical part 8, so that the diameter of the cylindrical part 8 gradually decreases.

[0029] The finishing mill 3 includes a gear ring 31, with annular grooves 311 on both sides of the gear ring 31. A guide ring 32 is slidably connected in the annular grooves 311. Multiple fixed shafts 321 are fixedly connected to the guide rings 32. A bracket 33 is fixedly connected to the fixed shafts 321. Two elliptical blocks 34 are fixedly provided on the inner wall of the gear ring 31. Multiple positioning holes 341 are provided at both ends of the elliptical blocks 34. Bolts 35 are threaded into the positioning holes 341. A rotating shaft 361 is fixedly connected to the bottom of each bolt 35. A pressure roller 36 is rotatably connected between the rotating shafts 361.

[0030] By adopting the above technical solution, the gear ring 31 is installed in different positioning holes 341 by bolts 35, so that the distance between the two pressure rollers 36 is changed, thereby making the diameter of the cylindrical part 8 gradually smaller. The gear ring 31 drives the pressure rollers 36 to rotate, making the diameter of the cylindrical part 8 smaller.

[0031] Two pressure rollers 36 are fixedly installed inside any one of the toothed rings 31, and a cylindrical member 8 passes through the two pressure rollers 36.

[0032] By adopting the above technical solution, the adjustable pressure roller 36 rotates along the outer surface of the cylindrical part 8, thereby quickly reducing the diameter of the cylindrical part 8.

[0033] The reciprocating mechanism 5 includes a half-face gear 51, which is fixedly connected to the output end of the motor 21. The half-face gear 51 is meshed with a toothed plate 52. Guide blocks 53 are slidably connected to both ends of the toothed plate 52. The guide blocks 53 are fixedly connected to the vertical plate 23. A strip rod 54 is fixedly connected to one end of the toothed plate 52. The strip rod 54 is drivenly connected to the multi-hole arc tube 43.

[0034] By adopting the above technical solution, the half-face gear 51 drives the toothed plate 52 to slide back and forth along the guide block 53, causing the strip rod 54 to drive the porous arc tube 43 to swing.

[0035] Each of the porous arc-shaped tubes 43 is fixed with a U-shaped block 44. A cross groove 441 is opened on the U-shaped block 44. A sliding shaft 45 is slidably connected in the cross groove 441. A push shaft 46 is fixedly connected between the sliding shafts 45. The bottom end of the push shaft 46 moves through the cooling chamber 4 and is fixedly connected to one end of the strip rod 54.

[0036] By adopting the above technical solution, when the push shaft 46 moves up and down, the slide shaft 45 can slide along the cross groove 441, causing the porous arc tube 43 to swing.

[0037] The winding device 6 includes two outer discs 61. An inner cylinder 62 is fixedly connected to the inner wall of the outer disc 61. A cylindrical part 8 is wound around the outer surface of the inner cylinder 62. Multiple through holes 621 are opened on the inner cylinder 62. A limit rod 64 is movably inserted into the through hole 621. A drive shaft 63 is fixedly connected to the limit rod 64.

[0038] By adopting the above technical solution, the outer surface of the inner cylinder 62 is wrapped with a cylindrical part 8, and multiple limiting rods 64 at the bottom end of the drive shaft 63 are inserted into the through hole 621, so that the drive shaft 63 can drive the inner cylinder 62 to rotate.

[0039] A method for hot rolling aluminum coils includes the following steps:

[0040] Step 1: After the cylindrical part 8 is heated in the hot rolling furnace 1, it is hot rolled by multiple precision rolling devices 3 to reduce its diameter. Then it is wound by the inner cylinder column 62. The two ends of the inner cylinder column 62 are fixedly connected to the outer disk 61, and multiple limiting rods 64 at the bottom of the drive shaft 63 are inserted into the through hole 621 so that the drive shaft 63 can drive the inner cylinder column 62 to rotate.

[0041] Step 2: The output end of motor 21 drives multiple power gears 22 to rotate. Under the action of bracket 33, guide ring 32 causes the corresponding gear ring 31 to rotate stably along guide ring 32. Then, two elliptical blocks 34 are fixedly installed in any one gear ring 31, and two pressure rollers 36 are rotatably installed in the elliptical blocks 34 to press the cylindrical part 8. The pressure rollers 36 rotate along the outer surface of the cylindrical part 8, making the diameter of the cylindrical part 8 smaller. Multiple gear rings 31 are installed in different positioning holes 34 by bolts 35. Within 1, the distance between the two pressure rollers 36 is changed, thereby allowing the diameter of the cylindrical part 8 to be gradually reduced. Then, the output end of the motor 21 drives the half-face gear 51 to rotate, causing the tooth plate 52 to slide back and forth along the guide block 53. The push shaft 46 is driven to move up and down through the strip rod 54. Then, the porous arc tube 43 at the upper and lower ends of the cylindrical part 8 swings along the cooling pipe 41 through the rotating pipe 42, so that the cylindrical part 8 with the reduced diameter is quickly cooled in the cooling chamber 4, which facilitates the inner cylinder column 62 to wind the cylindrical part 8.

[0042] Working principle: After the cylindrical part 8 is heated in the hot rolling furnace 1, it is hot rolled by multiple precision rolling devices 3 to reduce its diameter. Then, it is wound by the inner cylinder column 62. The two ends of the inner cylinder column 62 are fixedly connected to the outer disk 61. Multiple limiting rods 64 at the bottom of the drive shaft 63 are inserted into the through hole 621, so that the drive shaft 63 can drive the inner cylinder column 62 to rotate. The output end of the motor 21 drives multiple power gears 22 to rotate. Under the action of the bracket 33, the guide ring 32 makes the corresponding gear ring 31 rotate stably along the guide ring 32. Then, two elliptical blocks 34 are fixedly installed in any one of the gear rings 31, and two pressure rollers 36 are rotatably installed in the elliptical blocks 34 to press against each other. The cylindrical part 8 is rotated along the outer surface of the cylindrical part 8 by the pressure roller 36, which reduces the diameter of the cylindrical part 8. Multiple toothed rings 31 are installed in different positioning holes 341 by bolts 35, which changes the distance between the two pressure rollers 36, thereby allowing the diameter of the cylindrical part 8 to be gradually reduced. Then, the output end of the motor 21 drives the half-face gear 51 to rotate, causing the toothed plate 52 to slide back and forth along the guide block 53. The push shaft 46 is driven to move up and down back and forth through the strip rod 54. Then, the multi-hole arc tube 43 at the upper and lower ends of the cylindrical part 8 swings along the cooling pipe 41 through the rotating pipe 42, so that the cylindrical part 8 with the reduced diameter is quickly cooled in the cooling chamber 4, which facilitates the inner cylinder column 62 to wind the cylindrical part 8.

[0043] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A hot rolling control system for aluminum coils, comprising a hot rolling furnace (1), characterized in that: A cylindrical component (8) is provided inside the hot rolling furnace (1). A material guiding assembly (7) is fixedly connected to the side of the hot rolling furnace (1). A material guiding power assembly (2) is fixedly installed on the material guiding assembly (7). The material guiding power assembly (2) is driven to connect multiple finishing rolling devices (3). The cylindrical component (8) passes through the finishing rolling device (3). The material guiding power assembly (2) is driven to connect a reciprocating mechanism (5). The cylindrical component (8) moves through the cooling chamber (4). Two cooling pipes (41) are fixedly sleeved inside the cooling chamber (4). A rotating pipe (42) is rotatably connected to each cooling pipe (41). Multiple perforated arc-shaped pipes (43) are fixedly provided on each rotating pipe (42). The reciprocating mechanism (5) is driven to connect with the perforated arc-shaped pipes (43). A winding device (6) is wound around one end of the cylindrical component (8). The material guiding assembly (7) includes a guard frame (71), which is fixedly connected to the side of the hot rolling furnace (1). A single guide roller (72) and a double guide roller (73) are rotatably mounted on the guard frame (71). A cylindrical member (8) is movably passed between the double guide rollers (73). The material guiding power assembly (2) is fixedly connected to the side of the guard frame (71). The material guiding power assembly (2) includes a motor (21), the motor (21) is fixedly connected to a mounting frame (211), the mounting frame (211) is fixedly connected to a guard frame (71), the output end of the motor (21) is fixedly connected to a plurality of power gears (22), the power gears (22) are respectively connected to a precision rolling device (3), the output end of the motor (21) is rotatably connected to a vertical plate (23), and the output end of the motor (21) is connected to a reciprocating mechanism (5). The reciprocating mechanism (5) includes a half-face gear (51), which is fixedly connected to the output end of the motor (21). The half-face gear (51) is meshed with a toothed plate (52). Guide blocks (53) are slidably connected to both ends of the toothed plate (52). The guide blocks (53) are fixedly connected to the vertical plate (23). A strip rod (54) is fixedly connected to one end of the toothed plate (52). The strip rod (54) is connected to the perforated arc tube (43) in a transmission connection. Each of the porous arc tubes (43) is fixed with a U-shaped block (44), and a cross groove (441) is provided on the U-shaped block (44). A sliding shaft (45) is slidably connected in the cross groove (441), and a push shaft (46) is fixedly connected between the sliding shafts (45). The bottom end of the push shaft (46) moves through the cooling chamber (4) and is fixedly connected to one end of the strip rod (54).

2. The aluminum wire rod hot rolling control system as described in claim 1, characterized in that, The hot rolling furnace (1) has discharge grooves (12) on both sides, and an exhaust pipe (11) is fixedly installed on the upper surface of the hot rolling furnace (1). A cylindrical component (8) is movable through the discharge groove (12).

3. The aluminum disk hot rolling control system of claim 1, wherein, The finishing mill (3) includes a gear ring (31), with annular grooves (311) on both sides of the gear ring (31). A guide ring (32) is slidably connected in the annular groove (311). Multiple fixed shafts (321) are fixedly connected to the guide ring (32). A bracket (33) is fixedly connected to the fixed shaft (321). Two elliptical blocks (34) are fixedly provided on the inner wall of the gear ring (31). Multiple positioning holes (341) are provided at both ends of the elliptical blocks (34). Bolts (35) are threaded into the positioning holes (341). A rotating shaft (361) is fixedly connected to the bottom end of each bolt (35). A pressure roller (36) is rotatably connected between the rotating shafts (361).

4. The aluminum disk hot rolling control system of claim 3, wherein, Two pressure rollers (36) are fixedly installed inside any of the toothed rings (31), and a cylindrical member (8) passes through the two pressure rollers (36).

5. The aluminum disk hot rolling control system as claimed in claim 1, wherein The winding device (6) includes two outer discs (61), and an inner cylinder (62) is fixedly connected to the inner wall of the outer disc (61). A cylindrical part (8) is wound around the outer surface of the inner cylinder (62). Multiple through holes (621) are opened on the inner cylinder (62). A limit rod is movably inserted into the through hole (621), and a drive shaft (63) is fixedly connected to the limit rod.

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