Hoisting mechanism and hoisting system

Abstract

The utility model relates to the technical field of hoisting equipment, and provides a hoisting mechanism and a hoisting system.The hoisting mechanism comprises a hoisting support, a winding drum, a driving assembly and two hoisting assemblies, the winding drum and the driving assembly are arranged on the hoisting support, the output end of the driving assembly is in transmission connection with the winding drum, and the two hoisting assemblies are symmetrically arranged on the two sides of the winding drum; the lifting assembly comprises a first sling, a second sling, a first fixed pulley block, a second fixed pulley block, a first movable pulley block and a second movable pulley block. The first movable pulley block and the second movable pulley block are arranged below the lifting support in the first direction in a spaced mode. The first sling is wound around the first fixed pulley block and the first movable pulley block, and the second sling is wound around the first fixed pulley block, the second fixed pulley block and the second movable pulley block. The hoisting mechanism and the hoisting system provided by the utility model solve the defects that a steel wire rope between hoisting points of an existing single quadruple winding drum is poorer in synchronism during hoisting, and a hoisting tool is easy to incline in the hoisting process.

Description

Technical Field

[0001] The utility model relates to the technical field of lifting equipment, in particular to a lifting mechanism and a lifting system. Background Art

[0002] Cranes are widely used in the material handling sector of the national economy, and their lifting mechanisms come in a variety of structural forms. Currently, common multi-point cranes primarily consist of two double-drum structures and a single quadruple-drum structure. The relatively loose structure of two double-drum structures can be quite inconvenient when used in limited working space. The single quadruple-drum structure, however, is more common in European cranes due to its compact structure.

[0003] However, the existing single quadruple drum has unreasonable layout of the pulley group and the winding method of the steel cable, resulting in poor synchronization of the steel wire ropes between the lifting points during lifting, making the sling prone to tilting during the lifting process. Utility Model Content

[0004] The utility model provides a lifting mechanism and a lifting system for solving the defect that the existing single quadruple drum has poor synchronization between the wire ropes during lifting, which makes the lifting device prone to tilting during the lifting process.

[0005] On the one hand, the utility model provides a lifting mechanism, comprising: a lifting bracket, a reel, a drive assembly and two lifting assemblies, the reel and the drive assembly are both arranged on the lifting bracket, the output end of the drive assembly is transmission-connected to the reel to drive the reel to rotate, and the two lifting assemblies are symmetrically arranged on both sides of the reel.

[0006] The lifting assembly includes a first sling, a second sling, a first fixed pulley group, a second fixed pulley group, a first movable pulley group and a second movable pulley group. The first sling and the second sling are both wound around the drum. The first fixed pulley group and the second fixed pulley group are arranged at intervals on the lifting bracket along the first direction. The first movable pulley group and the second movable pulley group are arranged at intervals below the lifting bracket along the first direction.

[0007] The first sling is wound around the first fixed pulley group and the first movable pulley group, the second sling is wound around the first fixed pulley group, the second fixed pulley group and the second movable pulley group, and the number of times the first sling is wound around the first movable pulley group is the same as the number of times the second sling is wound around the second movable pulley group.

[0008] According to the lifting mechanism provided by the present invention, the first fixed pulley group includes a first fixed pulley, a second fixed pulley and a third fixed pulley, the second fixed pulley group includes a fourth fixed pulley and a fifth fixed pulley, the first movable pulley group includes a first movable pulley and a second movable pulley, and the second movable pulley group includes a third movable pulley and a fourth movable pulley.

[0009] The first sling is sequentially wound around the first fixed pulley, the first movable pulley, the second fixed pulley, and the second movable pulley, and the second sling is sequentially wound around the third fixed pulley, the fifth fixed pulley, the third movable pulley, the fourth fixed pulley, and the fourth movable pulley.

[0010] According to the lifting mechanism provided by the present utility model, the first fixed pulley, the second fixed pulley and the third fixed pulley are arranged side by side, the fourth fixed pulley and the fifth fixed pulley are arranged side by side, the first movable pulley and the second movable pulley are arranged side by side, and the third movable pulley and the fourth movable pulley are arranged side by side.

[0011] According to the lifting mechanism provided by the present invention, the first fixed pulley set and the second fixed pulley set are both arranged on the top of the lifting bracket.

[0012] According to the lifting mechanism provided by the present invention, the axis center of the drum is located higher than the axis centers of the first fixed pulley group and the second fixed pulley group, so that the first sling can pass through the upper part of the first fixed pulley group, and the second sling can pass through the upper part of the first fixed pulley group and the second fixed pulley group.

[0013] According to the lifting mechanism provided by the present invention, a support seat is provided on the lifting bracket, one end of the reel is rotatably engaged with the support seat, and the other end of the reel is connected to the output end of the drive assembly.

[0014] According to the lifting mechanism provided by the present invention, the driving assembly includes a motor and a reducer, the output end of the motor is connected to the reducer, and the output end of the reducer is connected to the reel.

[0015] The lifting mechanism provided by the utility model further includes a sling, and the first movable pulley set and the second movable pulley set are both connected to the sling.

[0016] According to the lifting mechanism provided by the utility model, it also includes an anti-sway guide column, one end of the anti-sway guide column is connected to the spreader, and the other end of the anti-sway guide column is vertically slidably matched with the lifting bracket.

[0017] Another aspect of the present invention provides a lifting system, comprising a track and a lifting mechanism as described in any one of the above items, wherein the lifting bracket is in sliding engagement with the track.

[0018] The lifting mechanism and lifting system provided by the utility model are such that the two lifting components are symmetrically arranged on both sides of the drum, and the first sling is wound around the first fixed pulley group and the first movable pulley group, and the second sling is wound around the first fixed pulley group, the second fixed pulley group and the second movable pulley group. The number of times the first sling is wound around the first movable pulley group is the same as the number of times the second sling is wound around the second movable pulley group. Therefore, the horizontal component forces generated by the oblique pulling of the corresponding first slings and the corresponding second slings in the two lifting components can offset each other, and the horizontal resultant force of the entire sling is zero. Through the reasonable arrangement of the fixed pulley group and the movable pulley group, and the reasonable setting of the winding of the first sling and the second sling, the lengths of the outgoing and incoming cables of the four slings in the two lifting components are kept consistent, thereby improving the verticality of the lifting action.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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.

[0021] Figure 1 This is one of the schematic diagrams of the lifting mechanism provided by the embodiment of the utility model.

[0022] Figure 2 This is the second schematic diagram of the lifting mechanism provided by the embodiment of the present utility model.

[0023] Figure 3 It is a schematic diagram of the winding of the first sling and the second sling in the lifting mechanism provided by an embodiment of the present utility model.

[0024] Reference numerals:

[0025] 10. Lifting bracket; 110. Support seat; 120. Guide groove; 20. Reel; 30. Drive assembly; 310. Motor; 320. Reducer; 330. Brake; 40. Lifting assembly; 410. First sling; 420. Second sling; 430. First fixed pulley set; 431. First fixed pulley; 432. Second fixed pulley; 433. Third fixed pulley; 440. Second fixed pulley set; 441. Fourth fixed pulley; 442. Fifth fixed pulley; 450. First movable pulley set; 451. First movable pulley; 452. Second movable pulley; 460. Second movable pulley set; 461. Third movable pulley; 462. Fourth movable pulley; 470. Hoisting device; 50. Anti-sway guide column. DETAILED DESCRIPTION

[0026] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0028] In the description of the embodiments of the present invention, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of the present invention based on specific circumstances.

[0029] In the embodiments of the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," or "above" a second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," or "below" a second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0031] The following combination Figures 1 to 3 The present invention describes a lifting mechanism and a lifting system.

[0032] See also Figures 1 to 3 As shown, the lifting mechanism provided by the embodiment of the present invention includes: a lifting bracket 10, a reel 20, a drive assembly 30 and two lifting assemblies 40. The reel 20 and the drive assembly 30 are both arranged on the lifting bracket 10. The output end of the drive assembly 30 is transmission-connected to the reel 20 to drive the reel 20 to rotate. The two lifting assemblies 40 are symmetrically arranged on both sides of the reel 20.

[0033] The lifting assembly 40 includes a first sling 410, a second sling 420, a first fixed pulley set 430, a second fixed pulley set 440, a first movable pulley set 450 and a second movable pulley set 460. The first sling 410 and the second sling 420 are both wound around the drum 20. The first fixed pulley set 430 and the second fixed pulley set 440 are spaced apart along the first direction on the lifting bracket 10. The first movable pulley set 450 and the second movable pulley set 460 are spaced apart along the first direction below the lifting bracket 10.

[0034] The first sling 410 is wound around the first fixed pulley set 430 and the first movable pulley set 450, and the second sling 420 is wound around the first fixed pulley set 430, the second fixed pulley set 440 and the second movable pulley set 460. The number of times the first sling 410 is wound around the first movable pulley set 450 is the same as the number of times the second sling 420 is wound around the second movable pulley set 460.

[0035] It should be noted that the above-mentioned “the first sling 410 is wound around the first fixed pulley group 430 and the first movable pulley group 450” means that the first sling 410 is wound around the first fixed pulley group 430 and the first movable pulley group 450 at least once (it can be a single time or multiple times, the same below), and each time the first sling 410 is wound around the first fixed pulley group 430, it is wound around a different fixed pulley in the first fixed pulley group 430, and each time the first sling 410 is wound around the first movable pulley group 450, it is wound around a different movable pulley in the first movable pulley group 450. Similarly, the above-mentioned “the second sling 420 is wrapped around the first fixed pulley group 430, the second fixed pulley group 440 and the second movable pulley group 460” means that the second sling 420 is wrapped around the first fixed pulley group 430, the second fixed pulley group 440 and the second movable pulley group 460 at least once, and each time the second sling 420 is wrapped around the first fixed pulley group 430, it is wrapped around a different fixed pulley in the first fixed pulley group 430, each time the second sling 420 is wrapped around the second fixed pulley group 440, it is wrapped around a different fixed pulley in the second fixed pulley group 440, and each time the second sling 420 is wrapped around the second movable pulley group 460, it is wrapped around a different movable pulley in the second movable pulley group 460.

[0036] The above-mentioned “first direction” specifically refers to Figure 1 Direction of arrow shown in .

[0037] The lifting mechanism and lifting system provided by the utility model are such that the two lifting assemblies 40 are symmetrically arranged on both sides of the drum 20, and the first sling 410 is wound around the first fixed pulley group 430 and the first movable pulley group 450, and the second sling 420 is wound around the first fixed pulley group 430, the second fixed pulley group 440 and the second movable pulley group 460. The first sling 410 is wound around the first movable pulley group 450 the same number of times as the second sling 420 is wound around the second movable pulley group 460. The horizontal component forces generated by the oblique pulling of the corresponding first sling 410 and the corresponding second sling 420 in the two lifting assemblies can offset each other, and the overall horizontal resultant force of the slings is zero. Through the reasonable arrangement of the fixed pulley group and the movable pulley group, and the reasonable setting of the winding of the first sling 410 and the second sling 420, the lengths of the four slings in the two lifting assemblies are kept consistent with those of the ropes, thereby improving the verticality of the lifting action.

[0038] Specifically, in this embodiment, the drum 20 is combined with the two first slings 410 and the two second slings 420 in the lifting assembly 40 to form a single four-unit drum. The rotation of the drum 20 can drive the first slings 410 and the second slings 420 to be lowered or wound on the drum 20.

[0039] Each lifting assembly 40 includes a first fixed pulley set 430, a second fixed pulley set 440, a first movable pulley set 450, and a second movable pulley set 460. The first fixed pulley set 430 and the second fixed pulley set 440 each include a plurality of independently rotatable fixed pulleys arranged side by side, and the first movable pulley set 450 and the second movable pulley set 460 each include a plurality of independently rotatable movable pulleys arranged side by side.

[0040] The first fixed pulley set 430 is located on the side of the lifting frame 10 away from the winding drum 20, and the second fixed pulley set 440 is located on the side of the lifting frame 10 closer to the winding drum 20. Two first movable pulley sets 450 and two second movable pulley sets 460 are arranged in a rectangular array on the upper surface of the sling 470. The first movable pulley set 450 is located directly below the corresponding first fixed pulley set 430, and the second movable pulley set 460 is located directly below the corresponding second fixed pulley set 440. The first movable pulley set 450 and the second movable pulley set 460 of the two lifting assemblies can lift four different points on the sling 470.

[0041] The ends of the first sling 410 and the second sling 420 are both connected to fixed points (hereinafter referred to as fixed ends) provided at corresponding positions of the lifting bracket 10 .

[0042] The first sling 410 and the second sling 420 can be selected according to the load conditions. For example, when the load is heavy, a sling such as a steel cable can be used, and when the load is light, a sling such as a synthetic fiber rope (such as polyester and polypropylene) can be used.

[0043] See also Figures 1 to 3 As shown, according to some embodiments of the present invention, the first fixed pulley group 430 includes a first fixed pulley 431, a second fixed pulley 432 and a third fixed pulley 433, the second fixed pulley group 440 includes a fourth fixed pulley 441 and a fifth fixed pulley 442, the first movable pulley group 450 includes a first movable pulley 451 and a second movable pulley 452, and the second movable pulley group 460 includes a third movable pulley 461 and a fourth movable pulley 462; the first sling 410 is sequentially wound around the first fixed pulley 431, the first movable pulley 451, the second fixed pulley 432, and the second movable pulley 452, and the second sling 420 is sequentially wound around the third fixed pulley 433, the fifth fixed pulley 442, the third movable pulley 461, the fourth fixed pulley 441 and the fourth movable pulley 462.

[0044] The winding method of the first sling 410 and the second sling 420 of the two lifting assemblies 40 is shown in FIG. Figure 3 shown.

[0045] The first sling 410 comprises: drum 20 - first fixed pulley 431 - first movable pulley 451 - second fixed pulley 432 - second movable pulley 452 - fixed end.

[0046] The second sling 420: drum 20 - third fixed pulley 433 - fifth fixed pulley 442 - third movable pulley 461 - fourth fixed pulley 441 - fourth movable pulley 462 - fixed end.

[0047] By winding the first sling 410 and the second sling 420 in the above manner, the pressure exerted by the slings on the fixed pulley group can be dispersed to different fixed pulleys, thereby reducing the pressure on a single fixed pulley. It can also make each of the first sling 410 and the second sling 420 have two fulcrums at the corresponding position of the sling 470. When the sling 470 lifts heavy objects, the load-bearing capacity is more evenly distributed, which can better share the load and reduce the pressure on a single sling, thereby enhancing the load-bearing capacity of the entire system.

[0048] In addition, by winding the first sling 410 and the second sling 420 in the above manner, while ensuring that the first sling 410 and the second sling 420 are wound around the movable pulley the same number of times, it can be ensured that the slings between each lifting point are wound the same number of times, so that the slings have the same rising rate during the lifting process, which not only improves the stability and safety of the crane, but also reduces the risk of the sling 470 being skewed during the lifting process.

[0049] See also Figures 1 to 3 As shown, according to some embodiments of the present invention, the first fixed pulley 431, the second fixed pulley 432 and the third fixed pulley 433 are arranged side by side, the fourth fixed pulley 441 and the fifth fixed pulley 442 are arranged side by side, the first movable pulley 451 and the second movable pulley 452 are arranged side by side, and the third movable pulley 461 and the fourth movable pulley 462 are arranged side by side.

[0050] By arranging the fixed pulleys in the fixed pulley block and the movable pulleys in the movable pulley blocks side by side, the pulley block structure can be made compact, and the sling can move smoothly between the different pulleys, thereby achieving more uniform load distribution.

[0051] See also Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, the first fixed pulley set 430 and the second fixed pulley set 440 are both arranged on the top of the lifting bracket 10.

[0052] In traditional lifting mechanisms, fixed pulley blocks are located at the bottom of the lifting frame 10. Operators can only rely on lifting equipment to transfer between different fixed pulley blocks, which is difficult and dangerous. The present invention installs both the first fixed pulley block 430 and the second fixed pulley block 440 at the top of the lifting frame 10. This allows operators to inspect and maintain the first and second fixed pulley blocks 430 and 440 directly from the top of the lifting frame 10, simplifying and improving work efficiency and enhancing safety during operations.

[0053] Specifically, a crossbeam is provided on the lifting bracket 10, and a corresponding number of mounting seats are provided at intervals on the crossbeam. The mounting seats are used to install and fix the first fixed pulley group 430 and the second fixed pulley group 440, and enable each fixed pulley to rotate freely.

[0054] See also Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, the axis center of the drum 20 is located higher than the axis centers of the first fixed pulley set 430 and the second fixed pulley set 440, so that the first sling 410 can pass through the upper part of the first fixed pulley set 430, and the second sling 420 can pass through the upper part of the first fixed pulley set 430 and the second fixed pulley set 440.

[0055] When the sling is passed over the upper portion of the corresponding fixed pulley block, it can adapt to the situation where the fixed pulley block is placed on the top of the lifting frame 10, and can reduce the friction resistance between the sling and the fixed pulley, thereby improving the lifting efficiency and reducing the energy required for lifting. In addition, it can also reduce the friction between the sling and the fixed pulley, reduce wear, and extend the service life of the sling and the fixed pulley.

[0056] See also Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, a support seat 110 is provided on the lifting bracket 10, one end of the reel 20 is rotatably engaged with the support seat 110, and the other end of the reel 20 is connected to the output end of the driving assembly 30.

[0057] By arranging the support base 110 on the lifting bracket 10 , the support base 110 can be used to support and fix the drum 20 , and the axial center position of the drum 20 can be raised to a position higher than the axial centers of the first fixed pulley group 430 and the second fixed pulley group 440 .

[0058] See also Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, the driving assembly 30 includes a motor 310 and a reducer 320 , the output end of the motor 310 is connected to the reducer 320 , and the output end of the reducer 320 is connected to the reel 20 .

[0059] Specifically, motor 310 is a single-output shaft motor 310, whose output shaft is connected to the input of a reducer 320, which in turn is in transmission connection with drum 20. Reducer 320 regulates the speed of drum 20 within a set range, ensuring the stability of the hoisting mechanism during operation. Reducer 320 also increases output torque, enabling motor 310 to handle larger loads and meet lifting requirements.

[0060] In addition, a brake 330 may be provided between the motor 310 and the reducer 320 and / or between the reducer 320 and the reel 20 as required, so that in an emergency, the brake 330 can be used to stop the operation of the equipment and prevent accidents. Functional components such as an overspeed switch and an encoder may also be provided at the rear of the motor 310.

[0061] See also Figure 1 and Figure 2 As shown, according to some embodiments of the present invention, the lifting mechanism further includes an anti-sway guide column 50, one end of the anti-sway guide column 50 is connected to the sling 470, and the other end of the anti-sway guide column 50 is vertically slidably matched with the lifting bracket 10.

[0062] By providing the anti-sway guide column 50 , the sling 470 can be guided when it is lifted, thereby preventing the sling 470 from shaking.

[0063] Specifically, in this embodiment, a guide slot 120 is provided in the middle of the lifting frame 10. One end of the anti-sway guide post 50 is inserted into the guide slot 120 and used to limit the position of the anti-sway guide post 50, preventing the spreader 470 from shifting during vertical movement. Furthermore, each fixed pulley assembly and each movable pulley assembly are located on the periphery of the anti-sway guide post 50, making the lifting mechanism more compact.

[0064] The lifting system provided by the present invention is described below. The lifting system described below and the lifting mechanism described above can be referenced to each other.

[0065] The lifting system provided in the embodiment of the present invention includes a track (such as a driving track, etc.) and a lifting mechanism as described in any of the above embodiments, and the lifting bracket 10 is in sliding cooperation with the track.

[0066] The lifting system provided by the present invention adopts the lifting mechanism of the above-mentioned embodiment. Therefore, the horizontal component forces generated by the oblique pulling of the corresponding first sling 410 and the corresponding second sling 420 in the two lifting assemblies can offset each other, and the overall horizontal resultant force of the sling is zero. Through the reasonable arrangement of the fixed pulley group and the movable pulley group, and the reasonable setting of the winding of the first sling 410 and the second sling 420, the lengths of the four slings in the two lifting assemblies are kept consistent when they are outgoing and ingoing, thereby improving the verticality of the lifting action.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A lifting mechanism, characterized in that: include: A lifting bracket, a reel, a drive assembly, and two lifting assemblies, wherein the reel and the drive assembly are both provided on the lifting bracket, the output end of the drive assembly is transmission-connected to the reel to drive the reel to rotate, and the two lifting assemblies are symmetrically provided on both sides of the reel; The lifting assembly includes a first sling, a second sling, a first fixed pulley set, a second fixed pulley set, a first movable pulley set, and a second movable pulley set. The first sling and the second sling are both wound around the drum. The first fixed pulley set and the second fixed pulley set are spaced apart along the first direction on the lifting bracket. The first movable pulley set and the second movable pulley set are spaced apart along the first direction below the lifting bracket. The first sling is wound around the first fixed pulley group and the first movable pulley group, the second sling is wound around the first fixed pulley group, the second fixed pulley group and the second movable pulley group, and the number of times the first sling is wound around the first movable pulley group is the same as the number of times the second sling is wound around the second movable pulley group.

2. The lifting mechanism according to claim 1, characterized in that: The first fixed pulley group includes a first fixed pulley, a second fixed pulley, and a third fixed pulley, the second fixed pulley group includes a fourth fixed pulley and a fifth fixed pulley, the first movable pulley group includes a first movable pulley and a second movable pulley, and the second movable pulley group includes a third movable pulley and a fourth movable pulley; The first sling is sequentially wound around the first fixed pulley, the first movable pulley, the second fixed pulley, and the second movable pulley, and the second sling is sequentially wound around the third fixed pulley, the fifth fixed pulley, the third movable pulley, the fourth fixed pulley, and the fourth movable pulley.

3. The lifting mechanism according to claim 2, characterized in that: The first fixed pulley, the second fixed pulley and the third fixed pulley are arranged side by side, the fourth fixed pulley and the fifth fixed pulley are arranged side by side, the first movable pulley and the second movable pulley are arranged side by side, and the third movable pulley and the fourth movable pulley are arranged side by side.

4. The lifting mechanism according to claim 1, characterized in that: The first fixed pulley set and the second fixed pulley set are both arranged on the top of the lifting bracket.

5. The lifting mechanism according to claim 4, characterized in that: The axis of the drum is located higher than the axis of the first fixed pulley group and the second fixed pulley group, so that the first sling can pass over the upper part of the first fixed pulley group, and the second sling can pass over the upper part of the first fixed pulley group and the second fixed pulley group.

6. The lifting mechanism according to claim 5, characterized in that: A support seat is provided on the lifting bracket, one end of the reel is rotatably engaged with the support seat, and the other end of the reel is connected to the output end of the driving assembly.

7. The lifting mechanism according to any one of claims 1 to 6, characterized in that: The driving assembly includes a motor and a reducer, the output end of the motor is connected to the reducer, and the output end of the reducer is connected to the reel.

8. The lifting mechanism according to any one of claims 1 to 6, characterized in that: It also includes a sling, and the first movable pulley set and the second movable pulley set are both connected to the sling.

9. The lifting mechanism according to claim 8, characterized in that: It also includes an anti-sway guide column, one end of which is connected to the sling, and the other end of which is vertically slidably matched with the lifting bracket.

10. A lifting system, characterized in that: It comprises a track and the lifting mechanism according to any one of claims 1 to 9, wherein the lifting bracket is in sliding cooperation with the track.

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