Disc feeder speed reducer hoisting device capable of achieving posture adjustment

Abstract

The invention discloses a disk feeder speed reducer hoisting device capable of achieving posture adjustment, and relates to the technical field of hoisting. To solve the problem of convenience. The device specifically comprises a top plate; two main shafts are rotationally connected to the top of the top plate, two winding drums are rotationally connected to the outer wall of each main shaft, the two winding drums are in transmission fit through a two-degree-of-freedom linkage assembly, twisted ropes are wound around the outer walls of the winding drums, the ends of the twisted ropes penetrate through the top plate, and connectors are arranged at the bottoms of the twisted ropes; and a driving part for synchronously driving the two main shafts is arranged at the top of the top plate. Based on the design of a'planetary gear set ', the double-open freedom degree of revolution of the planetary gear and rotation of the outer gear ring is utilized, so that the device can automatically balance again after an acting force for changing the attitude is manually applied during attitude adjustment, the attitude keeping acting force needing to be manually provided is small, and the attitude adjustment precision is improved. And the use convenience is improved.

Description

Technical Field

[0001] The invention relates to the technical field of lifting and hoisting, and in particular to a lifting device for a disc feeder reducer capable of realizing posture adjustment. Background Art

[0002] The disc feeder is driven by an electric motor. In order to match the running speed of the disc feeder, a reducer is required between the motor and the disc feeder for speed reduction. When the reducer is installed or repaired, a lifting device is required for lifting due to its heavy weight.

[0003] After searching, the Chinese patent publication number CN118877701A discloses a variable frequency stirring reducer lifting device, including a top plate, a hanging ring is fixed at the middle position of the top of the top plate, and a hook is buckled on the hanging ring, the top of the hook is connected to a lifting rope, a mobile frame is provided on the periphery of the top plate, and a binding component is provided at the bottom of the mobile frame, the binding component includes two sets of lower straps, sliding rods are provided on the top of both ends of the lower straps, installation grooves are opened on both sides of the mobile frame corresponding to the positions of the sliding rods, and the sliding rods are installed inside the installation grooves. Compared with the prior art, the lower straps are wrapped around the bottom of the reducer, and the pressure belt covers the top of the reducer, so that the reducer as a whole is tightly wrapped.

[0004] The above patent has the following shortcomings: it uses a single-point hook type of lifting, which has poor stability on the one hand, and requires manual cooperation when the angle or position posture adjustment is required on the other hand. However, under the lifting state, according to the physical principle of minimum energy, the overall center of gravity of the reducer will tend to the bottom. After adjusting the posture, the center of gravity is bound to move up, and the support force required for the upward movement of the center of gravity needs to be provided manually, which is less convenient. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings in the prior art and to propose a disc feeder reducer lifting device capable of realizing posture adjustment.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A disc feeder reducer hoisting device capable of realizing posture adjustment, comprising a top plate; The top of the top plate is rotatably connected to two main shafts, the outer wall of each main shaft is rotatably connected to two reels, and the two reels are driven and matched through a double-degree-of-freedom linkage assembly, a twisted rope is wound around the outer wall of the reel, the end of the twisted rope passes through the top plate and a connector is provided at the bottom of the twisted rope, and a driving part for synchronously driving the two main shafts is provided at the top of the top plate; The dual-degree-of-freedom linkage assembly includes a sun gear and an outer gear ring. The sun gear is connected to the outer wall of the main shaft through a key. The outer wall of the sun gear is meshed with a plurality of planetary gears in a circular array. The outer gear ring is meshed with the outer walls of the plurality of planetary gears, and one side of the planetary gear is rotatably connected to a planet carrier through a planet shaft. The planet carrier is fixed to the side wall of one of the reels, and the outer gear ring is fixed to the side wall of the other reel through a connecting ring.

[0007] Preferably, the planet carrier and the connecting ring are fixed to the side wall of the drum at the same radius.

[0008] Furthermore: the driving part includes two driven sprockets respectively fixed to the outer walls of the two main shafts and a driving sprocket rotatably connected to the top of the top plate, the driven sprocket and the outer wall of the driving sprocket bite the same chain, and one side of the driving sprocket is driven by a driving mechanism fixed to the top outer wall of the top plate.

[0009] On the basis of the above scheme: the driving mechanism includes a transition sleeve, a driving shaft and a driven shaft, the outer wall of the driving shaft is fixed with a rotor core, the outside of the rotor core is equipped with a plurality of linear array stator coils, the outer wall of the stator coil is fixed with an outer shell, the outer shell is fixed to the top outer wall of the top plate by bolts, the outer wall of the driving shaft is provided with a plurality of key-shaped protrusions, and the transition sleeve is gap-fitted with the outer wall of the driving shaft and the key-shaped protrusions.

[0010] A better solution among the above solutions is that: a spiral groove is formed on the outer wall of the transition sleeve, and a transmission protrusion that is movably limited and matched with the spiral groove is fixed on the outer wall of the driven shaft.

[0011] As a further solution of the present invention: the end of the transition sleeve is in contact with a spring 1, and the other end of the spring 1 is in contact with the end face of the driving sprocket.

[0012] At the same time, the outer wall of the stator coil is fixed with an electrode column electrically connected to the two ends of the stator coil, the outer wall of the transition sleeve is rotatably connected with an axis shifting ring, the axis shifting ring is slidably connected to the top of the top plate through a guide rod, and the side wall of the axis shifting ring is fixed with an insulating frame by bolts, and the inner wall of the insulating frame is fixed with an electrode sheet that cooperates with the electrode column.

[0013] As a preferred embodiment of the present invention, the electrode columns and electrode sheets are connected to the same power supply circuit.

[0014] At the same time, a limiting component corresponding to the position and number of the twisted ropes is arranged at the bottom of the top plate.

[0015] As a more optimal solution of the present invention: the limiting assembly is composed of two groups of limiting pulleys respectively located on both sides of the twisted rope, and the limiting pulley is rotatably connected to the bottom of the top plate through a pulley shaft.

[0016] The beneficial effects of the present invention are: 1. The present invention, through a design based on a "planetary gear set", utilizes the dual open degrees of freedom of the planetary gear revolution and the outer gear ring rotation, so that when adjusting the posture, the human only needs to apply a force to change the posture, and the device will automatically find balance again, thereby making the posture maintenance force that needs to be provided by the human smaller, thereby increasing convenience of use.

[0017] 2. The present invention, by arranging two groups of main shafts, each group of main shafts drives a group of reels, so that four-point lifting can be achieved, the stability during the lifting process is increased, and during the four-point lifting process, the lifting forces at the four points are the same, thereby preventing safety hazards caused by local overload.

[0018] 3. The present invention, based on the transmission of the "motor", arranges the stator coils of the "motor" into multiple groups, so that the movement of the electrode sheets can be used to change the number of working stator coils, so that the output power of the "motor" can be adjusted according to the dead weight of the reducer, which not only prevents the inability to lift or burn out due to insufficient power, but also solves the waste of resources caused by power redundancy.

[0019] 4. The present invention utilizes the transmission protrusion and the spiral groove as one of the links in the entire transmission chain. The transmission protrusion and the spiral groove will generate axial force during transmission, so that the number of stator coils connected can be automatically adjusted according to the torque change caused by the weight of the reducer, thereby eliminating the need for manual or electronic control access, thereby increasing convenience of use.

[0020] 5. The present invention can limit the position of the twisted rope by two sets of limiting pulleys, thereby ensuring that the top position of the twisted rope during the lifting process is a fixed point, thereby reducing the swing of the drum when winding the twisted rope and increasing stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a disc feeder reducer lifting device capable of achieving posture adjustment proposed by the present invention; Figure 2 A schematic diagram of the structure of a double-degree-of-freedom linkage assembly of a disc feeder reducer hoisting device capable of realizing posture adjustment proposed by the present invention; Figure 3 This is a schematic diagram of the structure of the driving part of a disc feeder reducer hoisting device capable of realizing posture adjustment proposed by the present invention; Figure 4 This is a schematic diagram of the driving mechanism structure of a disc feeder reducer hoisting device capable of realizing posture adjustment proposed by the present invention; Figure 5 This is a schematic cross-sectional structure diagram of a transition sleeve and a drive shaft of a disc feeder reducer hoisting device capable of realizing posture adjustment proposed by the present invention; Figure 6 A schematic cross-sectional view of the driving mechanism of a disc feeder reducer hoisting device capable of realizing posture adjustment proposed by the present invention; Figure 7 A schematic diagram of the structure of a limit assembly of a disc feeder reducer hoisting device capable of realizing posture adjustment proposed by the present invention; Figure 8 The present invention provides a schematic diagram of the circuit structure of a disc feeder reducer hoisting device capable of achieving posture adjustment.

[0022] In the figure: 1. top plate; 2. limit assembly; 3. pulley shaft; 4. limit pulley; 5. double-degree-of-freedom linkage assembly; 6. reel; 7. main shaft; 8. rope; 9. connector; 10. planet carrier; 11. planet shaft; 12. planet gear; 13. sun gear; 14. connecting ring; 15. outer gear ring; 16. chain; 17. driven sprocket; 18. driving mechanism; 19. driving sprocket; 20. transmission protrusion; 21. spiral groove; 22. transition sleeve; 23. outer shell; 24. stator coil; 25. rotor core; 26. driving shaft; 27. electrode column; 28. driven shaft; 29. ​​spring 1; 30. key-shaped protrusion; 31. guide rod; 32. shaft shift ring; 33. insulating frame; 34. electrode sheet. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention. Example

[0025] A disc feeder reducer lifting device capable of realizing posture adjustment, such as Figure 1 - Figure 8 As shown, it includes a top plate 1. In this embodiment, the fixing method of the top plate 1 is not described in detail. It can be fixed to the ceiling of the factory or the top of the stand, and can also be used in conjunction with a trolley for movement. The above are all common knowledge of those skilled in the art. This embodiment does not make creative work on it, so it is not described in detail. The top of the top plate 1 is rotatably connected to two main shafts 7, and the outer wall of each main shaft 7 is rotatably connected to two drums 6, and the two drums 6 are driven and matched through a double-degree-of-freedom linkage assembly 5. The outer wall of the drum 6 is wound with a rope 8, and the end of the rope 8 passes through the top plate 1 and a connector 9 is provided at the bottom of the rope 8. The top of the top plate 1 is provided with a driving unit for synchronously driving the two main shafts 7.

[0026] In this embodiment, the specific type of the connector 9 is not limited. It can be a hook that matches the reducer lifting ear, a threaded rod that matches the reducer lifting ear mounting hole, or a high-magnetic magnet. It is intended to connect the rope 8 to the reducer, and the above technologies are all existing technologies. This embodiment does not make creative work on them, so they will not be elaborated.

[0027] The dual-degree-of-freedom linkage assembly 5 includes a sun gear 13 and an outer ring gear 15. The sun gear 13 is connected to the outer wall of the main shaft 7 through a key. The outer wall of the sun gear 13 is meshed with a plurality of planetary gears 12 in a circular array. The outer ring gear 15 is meshed with the outer walls of the plurality of planetary gears 12, and one side of the planetary gear 12 is rotatably connected to a planet carrier 10 through a planet shaft 11. The planet carrier 10 is fixed to the side wall of one of the reels 6, and the outer ring gear 15 is fixed to the side wall of the other reel 6 through a connecting ring 14.

[0028] The planet carrier 10 and the connecting ring 14 are fixed to the side wall of the winding drum 6 at the same radius.

[0029] When the device is in use, the connecting head 9 can be used to fix the rope 8 and the reducer. Then, when the driving part is started, it can drive the main shaft 7 to rotate, thereby driving the sun gear 13 to rotate. When the sun gear 13 rotates, the engagement of the planetary gear 12 and the outer ring gear 15 can provide a rotational torque for the planetary gear 12 and the outer ring gear 15 at the same time, thereby driving the drum 6 to rotate. The reel 6 is used to retract and release the rope 8 to achieve the lifting and hoisting of the reducer. In the lifting process, due to the revolution of the planetary gear 12 and the rotation of the outer ring gear 15, although they both obtain power from the sun gear 13, they all have one degree of freedom, and the power distribution of the two degrees of freedom is consistent, so that the lifting forces of the four lifting points are the same. When adjusting the posture, the reducer posture adjustment will be manually assisted. After the reducer posture is adjusted, the state of the same lifting forces of the four lifting points will be broken, so that when the sun gear 13 does not rotate, the planetary gear 12 revolves or the outer ring gear 15 rotates automatically, and then the lifting forces of the four lifting points are in the same state.

[0030] This device, through a design based on a "planetary gear set", utilizes the dual open degrees of freedom of the planetary wheel 12 revolving and the outer gear ring 15 rotating, so that when adjusting the posture, the human only needs to apply a force to change the posture, and the device will automatically find balance again, thereby making the posture maintenance force required to be provided by the human smaller, thereby increasing convenience of use.

[0031] In addition, the device can realize four-point lifting by setting two groups of main shafts 7, each group of main shafts 7 drives a group of reels 6, thereby increasing the stability during the lifting process, and during the four-point lifting process, the lifting forces at the four points are the same, thereby preventing safety hazards caused by local overload.

[0032] To solve the driver problem; Figure 3 - Figure 8 As shown, the driving portion includes two driven sprockets 17 respectively fixed to the outer walls of the two main shafts 7 and a driving sprocket 19 rotatably connected to the top of the top plate 1, the driven sprocket 17 and the outer wall of the driving sprocket 19 bite the same chain 16, and one side of the driving sprocket 19 is driven by a driving mechanism 18 fixed to the top outer wall of the top plate 1.

[0033] The driving mechanism 18 includes a transition sleeve 22, a driving shaft 26 and a driven shaft 28. The outer wall of the driving shaft 26 is fixed with a rotor core 25. The outside of the rotor core 25 is equipped with a plurality of linear array stator coils 24. The outer wall of the stator coil 24 is fixed with an outer shell 23. The outer shell 23 is fixed to the top outer wall of the top plate 1 by bolts. The outer wall of the driving shaft 26 is provided with a plurality of key-shaped protrusions 30. The transition sleeve 22 is clearance-fitted with the outer walls of the driving shaft 26 and the key-shaped protrusions 30.

[0034] The outer wall of the transition sleeve 22 is provided with a spiral groove 21, and the outer wall of the driven shaft 28 is fixed with a transmission protrusion 20 that is movably limited and matched with the spiral groove 21. The end of the transition sleeve 22 is in contact with a spring 29, and the other end of the spring 29 is in contact with the end face of the driving sprocket 19.

[0035] The outer wall of the stator coil 24 is fixed with an electrode column 27 electrically connected to both ends of the stator coil 24, the outer wall of the transition sleeve 22 is rotatably connected with an axis shift ring 32, the axis shift ring 32 is slidably connected to the top of the top plate 1 through a guide rod 31, and the side wall of the axis shift ring 32 is fixed with an insulating frame 33 by bolts, and the inner wall of the insulating frame 33 is fixed with an electrode sheet 34 that cooperates with the electrode column 27.

[0036] The electrode column 27 and the electrode sheet 34 are connected to the same power supply circuit.

[0037] When the stator coil 24 is energized, the electromagnetic induction energy drives the rotor core 25 to rotate, thereby causing the drive shaft 26 to rotate. The drive shaft 26 drives the transition sleeve 22 to rotate through the key-shaped protrusion 30, and then drives the driven shaft 28 to rotate through the cooperation of the transmission protrusion 20 and the spiral groove 21, thereby driving the active sprocket 19 to rotate. In addition, when the reducer's own weight is greater, the torque transmission between the transmission protrusion 20 and the spiral groove 21 is greater, thereby increasing the component force between the transmission protrusion 20 and the spiral groove 21 along the axial direction of the transition sleeve 22, so that the transition sleeve 22 will overcome the spring 29 and cause axial displacement. When the transition sleeve 22 is axially displaced, the shaft shifting ring 32 will also move, thereby driving the electrode sheet 34 to move through the insulating frame 33. When the electrode sheet 34 moves, the contact position between the electrode sheet 34 and the electrode column 27 will change, thereby increasing the number of stator coils 24 connected to the circuit, thereby increasing the driving force, and vice versa. Reduce the driving force.

[0038] This device, based on the "motor" transmission, arranges the stator coils 24 of the "motor" into multiple groups, so that the movement of the electrode sheet 34 can be used to change the number of the working stator coils 24, so that the output power of the "motor" can be adjusted according to the deadweight of the reducer, which not only prevents the inability to lift or burn out due to insufficient power, but also solves the waste of resources caused by power redundancy.

[0039] In addition, the device utilizes the transmission protrusion 20 and the spiral groove 21 as one of the links in the entire transmission chain. The transmission protrusion 20 and the spiral groove 21 will generate an axial component force during transmission, thereby being able to automatically adjust the number of stator coils 24 connected according to the torque change caused by the weight of the reducer, thereby eliminating the need for manual or electronic control access, thereby increasing convenience of use.

[0040] When the present embodiment is in use, the connecting head 9 can be used to fix the rope 8 and the reducer, and then when the driving part is started, it can drive the main shaft 7 to rotate, thereby driving the sun gear 13 to rotate. When the sun gear 13 rotates, the engagement of the planetary gear 12 and the outer ring gear 15 can provide a rotational torque for the planetary gear 12 and the outer ring gear 15 at the same time, thereby driving the drum 6 to rotate. The reel 6 is used to retract and release the rope 8 to achieve the lifting and hoisting of the reducer. In the lifting process, due to the revolution of the planetary gear 12 and the rotation of the outer ring gear 15, although they both obtain power from the sun gear 13, they all have one degree of freedom, and the power distribution of the two degrees of freedom is consistent, so that the lifting force of the four lifting points is the same. When adjusting the posture, the reducer posture adjustment will be manually assisted. After the reducer posture adjustment, the state of the same lifting force of the four lifting points will be broken, so that when the sun gear 13 does not rotate, the planetary gear 12 orbits or the outer ring gear 15 rotates automatically, and then the four lifting points are lifted. The forces are in the same state, wherein when the stator coil 24 is energized, the electromagnetic induction energy drives the rotor core 25 to rotate, thereby causing the drive shaft 26 to rotate, and the drive shaft 26 drives the transition sleeve 22 to rotate through the key-shaped protrusion 30, and then drives the driven shaft 28 to rotate through the cooperation of the transmission protrusion 20 and the spiral groove 21, thereby driving the active sprocket 19 to rotate, and when the reducer's own weight is greater, the torque transmission between the transmission protrusion 20 and the spiral groove 21 is greater, thereby increasing the component force between the transmission protrusion 20 and the spiral groove 21 along the axial direction of the transition sleeve 22, so that the transition sleeve 22 will overcome the spring 29 and cause axial displacement, and when the transition sleeve 22 is axially displaced, the shaft shifting ring 32 will also move, thereby driving the electrode sheet 34 to move through the insulating frame 33, and when the electrode sheet 34 moves, the contact position between the electrode sheet 34 and the electrode column 27 will change, thereby increasing the number of stator coils 24 connected to the circuit, thereby increasing the driving force, and vice versa. Example

[0041] A disc feeder reducer lifting device capable of realizing posture adjustment, such as Figure 7 As shown, in order to solve the stability problem; this embodiment makes the following improvements on the basis of embodiment 1: a limiting component 2 corresponding to the position and number of the twisted rope 8 is provided at the bottom of the top plate 1, and the limiting component 2 is composed of two groups of limiting pulleys 4 respectively located on both sides of the twisted rope 8, and the limiting pulley 4 is rotatably connected to the bottom of the top plate 1 through the pulley shaft 3.

[0042] When this embodiment is in use, the two sets of limiting pulleys 4 can limit the position of the rope 8, thereby ensuring that the top position of the rope 8 during the lifting process is a fixed point, thereby reducing the swing of the drum 6 when winding the rope 8 and increasing stability.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A disc feeder reducer lifting device capable of realizing posture adjustment, comprising a top plate (1), characterized in that: The top of the top plate (1) is rotatably connected to two main shafts (7), the outer wall of each main shaft (7) is rotatably connected to two reels (6), and the two reels (6) are driven and matched through a double-degree-of-freedom linkage assembly (5), a twisted rope (8) is wound around the outer wall of the reel (6), the end of the twisted rope (8) passes through the top plate (1) and a connector (9) is provided at the bottom of the twisted rope (8), and a driving unit for synchronously driving the two main shafts (7) is provided at the top of the top plate (1); The dual-degree-of-freedom linkage assembly (5) comprises a sun gear (13) and an outer gear ring (15), wherein the sun gear (13) is connected to the outer wall of the main shaft (7) via a key, the outer wall of the sun gear (13) is meshed with a plurality of planetary gears (12) in a circular array, the outer gear ring (15) is meshed with the outer walls of the plurality of planetary gears (12), and one side of the planetary gear (12) is rotatably connected to a planet carrier (10) via a planet shaft (11), the planet carrier (10) is fixed to the side wall of one of the reels (6), and the outer gear ring (15) is fixed to the side wall of the other reel (6) via a connecting ring (14).

2. A disc feeder reducer lifting device capable of realizing posture adjustment according to claim 1, characterized in that: The planet carrier (10) and the connecting ring (14) are fixed to the side wall of the winding drum (6) at the same radius.

3. The disc feeder reducer lifting device capable of realizing posture adjustment according to claim 1, characterized in that: The driving part comprises two driven sprockets (17) respectively fixed to the outer walls of the two main shafts (7) and a driving sprocket (19) rotatably connected to the top of the top plate (1); the driven sprocket (17) and the outer walls of the driving sprocket (19) are engaged with the same chain (16), and one side of the driving sprocket (19) is transmission-coordinated with a driving mechanism (18) fixed to the top outer wall of the top plate (1).

4. The disc feeder reducer lifting device capable of realizing posture adjustment according to claim 3, characterized in that: The driving mechanism (18) comprises a transition sleeve (22), a driving shaft (26) and a driven shaft (28); a rotor core (25) is fixed to the outer wall of the driving shaft (26); a plurality of linear array stator coils (24) are fitted on the outside of the rotor core (25); an outer shell (23) is fixed to the outer wall of the stator coil (24); the outer shell (23) is fixed to the top outer wall of the top plate (1) by bolts; a plurality of key-shaped protrusions (30) are provided on the outer wall of the driving shaft (26); and the transition sleeve (22) is loosely fitted to the outer walls of the driving shaft (26) and the key-shaped protrusions (30).

5. The disc feeder reducer lifting device capable of realizing posture adjustment according to claim 4, characterized in that: The outer wall of the transition sleeve (22) is provided with a spiral groove (21), and the outer wall of the driven shaft (28) is fixed with a transmission protrusion (20) that is movably limited and matched with the spiral groove (21).

6. The disc feeder reducer lifting device capable of realizing posture adjustment according to claim 5, characterized in that: The end of the transition sleeve (22) is in contact with a spring 1 (29), and the other end of the spring 1 (29) is in contact with an end surface of the driving sprocket (19).

7. The disc feeder reducer lifting device capable of realizing posture adjustment according to claim 6, characterized in that: An electrode column (27) electrically connected to both ends of the stator coil (24) is fixed to the outer wall of the stator coil (24); an axis shift ring (32) is rotatably connected to the outer wall of the transition sleeve (22); the axis shift ring (32) is slidably connected to the top of the top plate (1) via a guide rod (31); an insulating frame (33) is fixed to the side wall of the axis shift ring (32) via bolts; an electrode sheet (34) matching the electrode column (27) is fixed to the inner wall of the insulating frame (33).

8. The disc feeder reducer lifting device capable of realizing posture adjustment according to claim 7, characterized in that: The electrode column (27) and the electrode sheet (34) are connected to the same power supply circuit.

9. The disc feeder reducer lifting device capable of realizing posture adjustment according to claim 1, characterized in that: The bottom of the top plate (1) is provided with a position limiting component (2) corresponding to the position and quantity of the twisted ropes (8).

10. The disc feeder reducer lifting device capable of realizing posture adjustment according to claim 9, characterized in that: The limiting assembly (2) is composed of two groups of limiting pulleys (4) respectively located on both sides of the twisted rope (8), and the limiting pulleys (4) are rotatably connected to the bottom of the top plate (1) via a pulley shaft (3).

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