Lifting device

Abstract

The invention relates to the technical field of elevators, in particular to a lifting device which comprises a plurality of lifting sets, each lifting set comprises a driving mechanism, a driving chain wheel set is installed on a driving output shaft of each driving mechanism, a driven chain wheel set is arranged below each driving chain wheel set, and the driven chain wheel sets are located at the bottom of a vertical shaft. A circle of steel wire rope net is wound between each driving chain wheel group and the corresponding driven chain wheel group; meshes of each circle of steel wire rope net can be meshed with chain wheel teeth of the driving chain wheels and the driven chain wheels in the corresponding driving chain wheel group and the corresponding driven chain wheel group; each circle of steel wire rope net is wound between the driving chain wheel and the driven chain wheel to form a ring, each circle of steel wire rope net comprises a balance section and a load section, the balance section is connected with a counterweight, and the load section is used for being connected with a lifted object. The structure that the driving chain wheel set, the driven chain wheel set and the steel wire rope net are in meshed transmission is adopted, and the problems of friction abrasion between steel wire ropes and disordered rope jumping in the multi-layer winding process are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of elevators, and in particular to a lifting device. Background Art

[0002] In shaft hoisting operations, the hoist is the core equipment, and its operating reliability is directly related to production efficiency and operation safety. At present, the industry generally adopts the method of winding wire rope around the drum for hoisting. Its structural design has the advantages of simple operation and direct power transmission.

[0003] However, when the hoist is started, braked, or the load changes, the wire rope will periodically bend and straighten within the drum groove. Especially in multi-layer winding conditions, the outer layer of wire rope must closely adhere to the surface of the inner rope body. This not only significantly increases the positive pressure at the contact point, but also causes severe friction and wear due to the relative displacement during drum rotation, shortening the actual service life of the wire rope. After the friction and wear of the wire rope increase with the number of cycles, coupled with the cumulative effect of internal fatigue of the wire rope, the wire rope is very likely to form localized wire breaks or even sudden fractures, posing a serious safety hazard to equipment operation.

[0004] In addition, when the wire rope transitions from the bottom layer to the upper layer of the drum, if the synchronization accuracy of the rope arrangement mechanism is insufficient or the rope body is worn and there is a local diameter deviation, it is very easy to cause cross-overlapping between adjacent rope loops, resulting in rope tangling. The tangled rope parts may even cause some rope segments to break away from the rope groove, destroying the force balance of the lifting system, making the heavy object lifting process unstable, and threatening the safety of underground workers and equipment. Summary of the Invention

[0005] In order to solve the technical problems in the existing shaft hoisting operation in which the hoisting method of winding the wire rope around the drum causes serious wire rope wear and easy rope jumping, which in turn causes safety accidents, the present invention provides a hoisting device.

[0006] To achieve the above object, the technical solution adopted by the present invention is: A lifting device includes several lifting groups, each lifting group includes a driving mechanism, each driving mechanism includes a driving output shaft, a driving sprocket group is coaxially mounted on each driving output shaft, the driving sprocket group includes several driving sprockets, a driven sprocket group is provided below each driving sprocket group, the driven sprocket group includes several driven sprockets, the driven sprocket group is located at the bottom of the shaft, a circle of wire rope net is wound around each driving sprocket group and the corresponding driven sprocket group, the mesh of each circle of wire rope net can engage with the sprocket teeth of the driving sprocket and the driven sprocket in the corresponding driving sprocket group and the driven sprocket group; each circle of wire rope net is wound around the driving sprocket and the driven sprocket to form a ring, each circle of wire rope net includes a balancing section and a load section, the balancing section is connected to a counterweight, and the load section is used to connect the lifting object.

[0007] Adopting this structural solution, the present invention replaces the traditional drum-wound wire rope hoisting method with an innovatively designed drive sprocket assembly, a driven sprocket assembly, and a meshed transmission structure. Unlike traditional wire ropes, the wire rope net eliminates the need for multiple layers of winding around the drum. This fundamentally eliminates the periodic bending and straightening deformation caused by the overlapping layers of wire rope, as well as the severe friction and wear caused by relative displacement between adjacent rope segments. This significantly extends the wire rope net's actual service life. Furthermore, it prevents the cross-over and tangling of wire ropes that can occur when the wire ropes transition from the bottom to the top of the drum, ensuring that the wire rope net maintains a stable load during the hoisting process, significantly improving the safety of the device. Furthermore, the balancing and load sections formed by the wire rope net's winding are connected to the counterweight and load, respectively. The counterweight can be flexibly adjusted according to the weight of the load, effectively balancing part of the load and reducing the power consumption of the drive mechanism. Furthermore, the counterweight's reverse tension during the lifting or lowering process suppresses vibration of the device, enhancing overall operational stability. This makes it particularly suitable for high-load, high-frequency shaft hoisting operations.

[0008] As a preferred implementation of a lifting device, the shaft is cylindrical, all lifting groups are evenly arranged around the circumference of the shaft, all balancing sections are arranged close to the inner wall of the shaft, and all load sections are arranged close to the interior of the shaft.

[0009] By adopting the above-mentioned structural scheme, when the vertical shaft is cylindrical and the lifting groups are evenly arranged around the circumference of the vertical shaft, all the balancing sections are arranged close to the inner wall of the vertical shaft, and all the load sections are arranged close to the inside of the vertical shaft, each lifting group can lift the same lifting object, and the pulling force of each lifting group can form a uniformly distributed circumferential restraining force, which can effectively offset the eccentric moment caused by the center of gravity offset or external disturbance of the lifting object, avoid the lifting object from tilting, shaking or even rotating during the lifting process, and ensure that the lifting object always moves smoothly along the central axis of the vertical shaft.

[0010] As a preferred implementation method of a lifting device, each driving mechanism includes two rotating motors and two reduction motors, each rotating motor includes a motor output shaft, the motor output shaft of each rotating motor is correspondingly connected to the input end of a reduction motor, each reduction motor includes a reduction output shaft, both ends of the drive output shaft are connected to couplings, and the reduction output shaft of each reduction motor is correspondingly connected to a coupling.

[0011] With the above structural scheme, each driving mechanism adopts a collaborative driving mode of double rotary motors and double reduction motors, the output power of the two reduction motors is converged to the driving output shaft through the shaft coupling, forming a symmetrical double-power input structure, which can provide double driving torque and easily meet the lifting requirements of heavy lifting objects (such as large equipment, ore hoppers, etc.). In addition, the double-motor driving has a significant redundancy advantage. When one of the rotary motors or reduction motors fails, the other power unit can still maintain a certain output power, so that the lifting object can slowly descend to a safe position, avoiding the lifting object falling accident caused by sudden power interruption, and greatly improving the reliability and emergency fault tolerance capability of the device. The setting of the reduction motor can convert the high-speed output of the rotary motor into low-speed and high-torque rotation of the driving output shaft, accurately match the low-speed and high-torque working condition requirements of the shaft lifting operation, ensure the lifting speed of the lifting object to be stable and controllable, and reduce the impact load during starting and braking.

[0012] As a preferred implementation of the lifting device, the driving sprockets in the driving sprocket set are uniformly distributed, and the driving sprocket set is located in the middle of the driving output shaft.

[0013] With the above structural scheme, the uniformly distributed driving sprockets in the driving sprocket set can form multi-point uniform meshing with the steel wire rope net, so that the stress of the steel wire rope net is dispersed to multiple sprockets in the transverse direction, avoiding excessive wear of local sprockets due to concentrated stress, and preventing local mesh deformation or rupture of the steel wire rope net due to excessive load, prolonging the service life of the steel wire rope net and the sprocket. The driving sprocket set is located in the middle of the driving output shaft, which can concentrate the stress support point of the driving output shaft in the middle section of the shaft body, balance the additional torque generated by connecting the reduction motor and the shaft coupling at both ends of the shaft body, reduce the bending deformation and vibration of the driving output shaft during rotation, ensure that the shaft body always maintains stable coaxiality, and also ensure that the meshing points of each driving sprocket and the steel wire rope net are in the same horizontal plane, avoiding uneven meshing gap caused by chain wheel position deviation, further improving the accuracy and stability of transmission.

[0014] As a preferred implementation of the lifting device, each rotary motor in each driving mechanism is a reversible motor.

[0015] By adopting the above-mentioned structural scheme, the reversible motor can be used as a motor and a generator, and has the function of bidirectional rotation. When the hoisted object needs to be raised, the reversible motor operates in motor mode, outputs torque through forward rotation, drives the drive output shaft and the drive sprocket group to rotate through the reduction motor and the coupling, and then drives the wire rope net to pull the hoisted object upward. At this time, the power output by the rotating motor is directly converted into the potential energy of the hoisted object, meeting the power demand of active lifting. When the hoisted object needs to be lowered, the reversible motor switches to generator mode. The gravitational potential energy of the hoisted object and the balanced potential energy of the counterweight jointly drive the wire rope net, the drive sprocket group, and the driven sprocket group to rotate in the opposite direction, driving the rotor of the rotating motor to rotate in the opposite direction. At this time, the rotating motor converts mechanical energy into electrical energy through electromagnetic induction and stores it, realizing energy recovery and reuse. The present invention does not require the additional setting of special power generation equipment, which not only simplifies the structure of the drive mechanism, but also significantly reduces the energy consumption of the lifting operation. In particular, the energy-saving effect is more prominent in frequent lifting operations. In addition, the bidirectional rotation characteristics of the reversible motor make the lifting and lowering switching of the hoisted objects more convenient. The lifting direction can be quickly changed through precise control of the motor steering, which improves the flexibility of operation.

[0016] As a preferred implementation method of a lifting device, the number of driving sprockets in each lifting group is equal to the number of driven sprockets, the shape of the mesh of each circle of wire rope net is rectangular, and the number of meshes in the horizontal transverse direction of each circle of wire rope net is at least equal to the number of driving sprockets in the corresponding lifting group.

[0017] The above-mentioned structural solution, with an equal number of drive sprockets and driven sprockets, allows the wire rope net to form symmetrical force fulcrums during the transmission process, ensuring that the tension of each sprocket on the wire rope net is evenly distributed, and avoiding local overload of the net body due to the mismatch of the number of sprockets. The rectangular mesh is more adaptable to the shape of the sprocket teeth, which can make the sprocket teeth fully embedded in the mesh, forming a surface contact meshing and reducing stress concentration at the meshing point. The number of horizontal meshes of the wire rope net is not less than the number of drive sprockets, which can ensure that each drive sprocket has an independent mesh to mesh with it, preventing the increase of local wear of the net body caused by multiple drive sprockets sharing a small number of meshes. At the same time, it reduces the relative sliding between the wire rope net and the drive sprocket during transmission, improving transmission efficiency and synchronization.

[0018] As a preferred implementation of the lifting device, the size of the mesh of each circle of the wire rope net in the horizontal transverse direction is adapted to the size of the sprocket teeth of the corresponding driving sprocket in the axial direction.

[0019] With this structural solution, the horizontal mesh size of the wire rope net matches the axial size of the drive sprocket teeth, allowing the sprocket teeth to fully embed within the mesh, achieving tight meshing. This reduces backlash during transmission, minimizes relative slip between the wire rope net and sprocket, and improves transmission efficiency. This matching size reduces impact and wear during meshing, extending the service life of the wire rope net and drive sprocket, and ensuring the precision of the lifting action.

[0020] As a preferred implementation of the lifting device, both side edges of each circle of the wire rope net are connected with metal reinforcement edges, and the metal reinforcement edges are welded to the side edges of the wire rope net.

[0021] With this structural solution, the metal reinforcement edges on both sides of the wire rope mesh are welded to the mesh body to form a rigid integral unit. This significantly enhances the structural strength of the mesh edges, preventing them from loosening or breaking due to excessive forces on the edges during meshing and transmission with the drive and driven sprockets. Furthermore, the metal reinforcement edges protect the sides of the wire rope mesh, reducing friction and wear between the edges and the shaft walls or other components, further extending the service life of the wire rope mesh.

[0022] The beneficial effects of the present invention include: This invention utilizes a drive sprocket assembly, a driven sprocket assembly, and a wire rope mesh transmission structure, replacing the traditional drum-wound wire rope hoisting method. The wire rope mesh does not need to be wound around the drum, fundamentally avoiding friction and wear between the wire ropes during multi-layer winding, as well as the problem of rope tangling and jumping, extending the service life of the wire rope mesh and improving operational safety. The balancing and load sections formed by the wire rope mesh are connected to the counterweight and hoisted object, respectively. The counterweight balances part of the weight of the hoisted object, reducing the load on the drive mechanism and enhancing the stability of the device during lifting or lowering. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solution of the present invention, the following is a brief introduction to the drawings required for the description. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 This is a structural schematic diagram of a lifting device in a specific embodiment of the present invention; Figure 2 This is a schematic diagram of a top view of a lifting device in a specific embodiment of the present invention; Figure 3 This is a structural diagram of a lifting group in a specific embodiment of the present invention; Figure 4Figure 1 is a schematic diagram of the front structure of the steel wire rope net in the embodiment of the present application; Figure 5 Figure 2 is a schematic diagram of the side structure of the steel wire rope net, the driving sprocket and the driven sprocket in the embodiment of the present application.

[0025] List of components and reference numerals: 1, driving mechanism; 11, driving output shaft; 12, rotary motor; 13, speed reducer; 14, motor output shaft; 15, speed reducer output shaft; 16, shaft coupling; 2, driving sprocket; 3, driven sprocket; 4, steel wire rope net; 41, mesh; 42, balance section; 43, load section; 5, counterweight; 6, hoisted object; 7, metal reinforcing edge; 8, shaft. EMBODIMENT

[0026] In order to make the objectives, characteristics and advantages of the present application more obvious and easy to understand, the technical solutions in the present application will be described clearly and completely below in combination with the drawings in the embodiment. Obviously, the following described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0027] Reference Figure 1-5 The shaft 8 is cylindrical. The present embodiment proposes a lifting device, which includes a plurality of lifting groups. All the lifting groups are uniformly arranged around the circumferential direction of the shaft 8. In the present embodiment, three lifting groups are provided. Each lifting group includes a driving mechanism 1. Each driving mechanism 1 includes a driving output shaft 11, two rotary motors 12 and two speed reducers 13. Each rotary motor 12 is a reversible motor, which can be used as a motor and a generator and has the function of bidirectional rotation. In any one driving mechanism 1, each rotary motor 12 includes a motor output shaft 14. The motor output shaft 14 of each rotary motor 12 is connected to the input end of one speed reducer 13 in correspondence. Each speed reducer 13 includes a speed reducer output shaft 15. The two ends of the driving output shaft 11 are connected with a shaft coupling 16. The speed reducer output shaft 15 of each speed reducer 13 is connected to one shaft coupling 16 in correspondence.

[0028] A drive sprocket assembly is coaxially mounted on each drive output shaft 11. The drive sprocket assembly is located in the middle of the drive output shaft 11 and comprises a plurality of evenly spaced drive sprockets 2. Below each drive sprocket assembly is a driven sprocket assembly, comprising a plurality of driven sprockets 3. In this embodiment, each drive sprocket assembly comprises four drive sprockets 2, and each driven sprocket assembly comprises four driven sprockets 3. The driven sprocket assembly is located at the bottom of the shaft 8. A coil of wire rope net 4 is wound around each drive sprocket assembly and the corresponding driven sprocket assembly. The mesh 41 of each coil of wire rope net 4 meshes with the sprocket teeth of the drive sprocket 2 and driven sprocket 3 in the corresponding drive sprocket assembly and driven sprocket assembly. Each circle of wire rope net 4 is wound around the driving sprocket 2 and the driven sprocket 3 to form a ring. Each circle of wire rope net 4 includes a balancing section 42 and a load section 43. The balancing section 42 is connected to the counterweight 5, and the load section 43 is used to connect the lifting object 6. All balancing sections 42 are arranged close to the inner wall of the shaft 8, and all load sections 43 are arranged close to the internal space of the shaft 8.

[0029] In this embodiment, the number of teeth Z of the driving sprocket 2 and the driven sprocket 3 is 24, and the module M is 50.

[0030] The meshes 41 of each wire rope net 4 are rectangular in shape. The number of meshes 41 in the horizontal direction of each wire rope net 4 is at least equal to the number of drive sprockets 2 in the corresponding lifting group. That is, in this embodiment, each wire rope net 4 has at least four meshes 41 in the horizontal direction. The horizontal dimensions of the meshes 41 of each wire rope net 4 match the axial dimensions of the sprocket teeth of the corresponding drive sprocket 2. In this embodiment, the meshes 41 can measure 50 mm x 50 mm. Metal reinforcement edges 7 are connected to the side edges of each wire rope net 4 by welding. In this embodiment, the diameter of the upper rope of the wire rope net 4 can be 10 mm.

[0031] Working process: Before the device is activated, the hoisting load 6 is securely connected to the wire rope net 4 in each hoisting group, facing the interior of the shaft 8, via hooks and other structures. Simultaneously, counterweights 5 are suspended from the wire rope net 4, near the sidewalls of the shaft 8. The weight of these counterweights 5 is precisely pre-set based on the weight of the hoisting load 6, typically 1.2-1.5 times the weight of the hoisting load 6. This counterweight 5 effectively balances the weight of the hoisting load 6 during subsequent lifting and lowering operations, ensuring stable operation of the device.

[0032] At this time, the steel wire rope net 4 is in a tight state, the mesh 41 of the steel wire rope net 4 is in close meshing with the sprocket teeth of the driving sprocket 2 and the driven sprocket 3, the two side edges of each coil of the steel wire rope net 4 are connected with the metal reinforcing edges 7, the metal reinforcing edges 7 and the side edges of the steel wire rope net 4 are connected as a whole by welding, which can form strong reinforcement protection for the edges of the steel wire rope net 4, avoid the problems of edge loosening and breaking in the initial stress and subsequent transmission process, and significantly improve the overall structural strength and service life of the steel wire rope net 4. Moreover, since the shaft 8 is cylindrical, all the lifting groups are uniformly arranged around the circumferential direction of the shaft 8, so that the pulling force of each lifting group on the lifting object 6 is uniformly distributed in the circumferential direction, which can ensure that the lifting object 6 will not tilt and shake in the initial state due to uneven stress, and provides an important guarantee for the stability of the entire lifting process.

[0033] When the lifting object 6 needs to be lifted upward, the rotary motor 12 in each driving mechanism 1 is synchronously rotated in the forward direction, the power output by the rotary motor 12 is first transmitted to the speed reducer 13 through the motor output shaft 14, the speed reducer 13 plays a role of speed reduction and torque increase, converts the high-speed rotation of the rotary motor 12 into low-speed large-torque output meeting the requirements of the lifting operation, and then is transmitted to the driving output shaft 11 through the speed reduction output shaft 15 and the shaft coupling 16 to drive the driving output shaft 11 to rotate. The driving sprocket set in the middle of the driving output shaft 11 rotates synchronously with the driving output shaft 11, the sprocket teeth of the driving sprocket 2 mesh with the rectangular mesh 41 of the steel wire rope net 4 to drive the steel wire rope net 4 to move upward, and under the driving of the steel wire rope net 4, the net body inside the shaft 8 moves upward to drive the lifting object 6 to ascend, while the net body of the steel wire rope net 4 close to the side wall of the shaft 8 drives the counterweight 5 to move downward, the gravity of the counterweight 5 balances part of the weight of the lifting object 6, significantly reduces the load of the rotary motor 12, and makes the entire lifting process more labor-saving and efficient.

[0034] Since each driving mechanism 1 includes two rotary motors 12 and two speed reducers 13, a double-power input mode is formed, which not only can provide greater driving force to meet the requirements of large-load lifting operation, but also can maintain a certain driving force when one of the rotary motors 12 or the speed reducers 13 fails, effectively reduces the risk of lifting interruption caused by the failure of a single power source, and greatly improves the operation reliability of the device.

[0035] The evenly spaced drive sprockets 2 within the drive sprocket assembly ensure more uniform force distribution between the meshing wire rope net 4 and each drive sprocket 2, preventing excessive force on a single sprocket, which could lead to increased wear or localized damage to the meshing wire rope net 4. Furthermore, the drive sprocket assembly, located in the middle of the drive output shaft 11, balances the force applied to both ends of the shaft, reducing bending deformation caused by uneven force, extending the service life of the shaft 11, and ensuring precise meshing between the drive sprockets 2 and the meshing wire rope net 4.

[0036] The number of drive sprockets 2 in each lifting group is equal to the number of driven sprockets 3, and the number of meshes 41 in the horizontal transverse direction of each coil of wire rope net 4 is at least equal to the number of drive sprockets 2 in the corresponding lifting group. The rectangular shape of the meshes 41 better matches the meshing of the sprocket teeth, ensuring that each drive sprocket 2 has sufficient meshes 41 to engage with it, enhancing the stability and reliability of the transmission and effectively preventing the occurrence of slippage. In addition, the horizontal transverse dimensions of the meshes 41 of each coil of wire rope net 4 are compatible with the axial dimensions of the sprocket teeth of the corresponding drive sprocket 2, allowing the sprocket teeth to be fully embedded in the meshes 41, achieving a tight meshing, reducing gaps during the transmission process, avoiding relative slippage between the wire rope net 4 and the sprocket, and improving transmission efficiency. It also reduces impact and wear during meshing, further extending the service life of the wire rope net 4 and the drive sprocket 2, and ensuring the accuracy of the lifting action.

[0037] When the hoisted object 6 needs to be lowered, the relevant braking device releases the restraint on the driving sprocket group (the braking device is an existing device in this field), and the hoisted object 6 begins to fall under the action of its own gravity, and its gravitational potential energy is released. At the same time, the counterweight 5 moves upward driven by the wire rope net 4, and the balance potential energy of the counterweight 5 is also involved, jointly driving the wire rope net 4, the driving sprocket group and the driven sprocket group to transmit in reverse, and then driving the driving output shaft 11 to rotate in the reverse direction. The reverse rotation of the driving output shaft 11 drives the reversible motor to rotate in the reverse direction. At this time, the reversible motor switches to the power generation mode, and converts part of the energy consumed in the lifting process and the potential energy of the hoisted object 6 and the counterweight 5 into electrical energy for recycling and reuse, effectively reducing the overall energy consumption of the device and achieving energy-saving effects.

[0038] Throughout the entire operation process, this embodiment utilizes a structure in which the drive sprocket assembly, the driven sprocket assembly, and the wire rope net 4 engage in a transmission, replacing the traditional hoisting method of winding the wire rope around a drum. The wire rope net 4 no longer needs to be wound around a drum, fundamentally avoiding the friction and wear between the wire ropes and the problem of tangled ropes jumping during multi-layer winding in the traditional method. This significantly extends the service life of the wire rope net 4 and significantly improves the safety of the device. The structural adaptation between the various components, such as the matching number of drive sprockets 2 and driven sprockets 3, the size adaptation of the mesh 41 and the sprocket teeth, and the strengthening effect of the metal reinforcement edge 7, further enhance the durability and safety of the device. At the same time, through the balancing and energy recovery of the counterweight 5, efficient and energy-saving operation of the device is achieved.

[0039] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A lifting device comprising a plurality of lifting groups, each lifting group comprising a driving mechanism (1), each driving mechanism (1) comprising a driving output shaft (11), characterized in that: A driving sprocket group is coaxially mounted on each driving output shaft (11), the driving sprocket group includes a plurality of driving sprockets (2), a driven sprocket group is provided below each driving sprocket group, the driven sprocket group includes a plurality of driven sprockets (3), the driven sprocket group is located at the bottom of the shaft (8), a circle of wire rope net (4) is wound between each driving sprocket group and the corresponding driven sprocket group, and the mesh (41) of each circle of wire rope net (4) can mesh with the sprocket teeth of the driving sprocket (2) and the driven sprocket (3) in the corresponding driving sprocket group and the driven sprocket group; Each circle of the wire rope net (4) is wound between the driving sprocket (2) and the driven sprocket (3) to form a ring shape. Each circle of the wire rope net (4) includes a balancing section (42) and a load section (43). The balancing section (42) is connected to a counterweight (5), and the load section (43) is used to connect a lifting object (6).

2. A lifting device according to claim 1, characterized in that: The vertical shaft (8) is cylindrical, all the lifting groups are evenly arranged around the circumference of the vertical shaft (8), all the balancing sections (42) are arranged close to the inner wall of the vertical shaft (8), and all the load sections (43) are arranged close to the interior of the vertical shaft (8).

3. A lifting device according to claim 1, characterized in that: Each driving mechanism (1) includes two rotating motors (12) and two reduction motors (13), each rotating motor (12) includes a motor output shaft (14), the motor output shaft (14) of each rotating motor (12) is correspondingly connected to the input end of a reduction motor (13), each reduction motor (13) includes a reduction output shaft (15), both ends of the driving output shaft (11) are connected to couplings (16), and the reduction output shaft (15) of each reduction motor (13) is correspondingly connected to a coupling (16).

4. A lifting device according to claim 3, characterized in that: The drive sprockets (2) in the drive sprocket assembly are evenly spaced and the drive sprocket assembly is located in the middle of the drive output shaft (11).

5. A lifting device according to claim 3, characterized in that: Each rotary motor (12) in each drive mechanism (1) is a reversible motor.

6. A lifting device according to claim 1, characterized in that: The number of driving sprockets (2) in each lifting group is equal to the number of driven sprockets (3), the shape of the meshes (41) of each circle of wire rope net (4) is rectangular, and the number of meshes (41) of each circle of wire rope net (4) in the horizontal transverse direction is at least equal to the number of driving sprockets (2) in the corresponding lifting group.

7. A lifting device according to claim 1, characterized in that: The size of the mesh (41) of each circle of the wire rope net (4) in the horizontal transverse direction is adapted to the size of the sprocket teeth of the corresponding driving sprocket (2) in the axial direction.

8. A lifting device according to claim 1, characterized in that: Both side edges of each circle of the wire rope net (4) are connected with metal reinforcement edges (7), and the metal reinforcement edges (7) are welded to the side edges of the wire rope net (4).

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