A precast component lifting machine

Abstract

This invention relates to the field of construction engineering technology, specifically disclosing a precast component lifting machine, comprising: a tower crane; a steel platform body, the steel platform body being fixed to the bottom of the tower crane hook by steel wire ropes; a connecting mechanism, the connecting mechanism being installed below the steel platform body, the connecting mechanism connecting the precast wall panel to the steel platform body; and an adjusting mechanism, the adjusting mechanism being installed between the connecting mechanism and the steel platform body. The limiting mechanism of this invention can limit the connection mechanism and the precast wall, preventing relative separation between the precast wall and the connecting mechanism during transportation. After transportation to the installation location and installation, the disengagement mechanism can, on the one hand, pull the precast wall to the correct position, and on the other hand, disengage the limiting mechanism and the connecting mechanism from the precast wall after installation, thereby ensuring that the precast wall will not detach during transportation, reducing damage costs during lifting, and ensuring the safety of workers.

Description

Technical Field

[0001] This invention relates to the field of building engineering technology, specifically to a precast component lifting machine. Background Technology

[0002] Prefabricated buildings in construction projects require the use of prefabricated components, which are prefabricated slabs or columns formed by mixing and solidifying steel bars and concrete in a factory or on-site before assembly. These components are then lifted to the required installation location using a hoist and assembled into a building.

[0003] When hoisting precast walls, it is necessary to use a tower crane hook to connect the bottom of a steel platform (such as...). Figure 9 As shown, after securing the precast component to the designated lifting position using slings at the bottom of the steel platform, the component is lifted. The angle between the slings and the precast component should not be less than 60° to reduce the lateral tension on the precast wall. During lifting, the precast wall is usually hooked up at the bottom of the slings. To prevent the airflow from blowing the lifted precast wall in windy weather, which could cause swaying between the precast wall and the slings and prevent the bottom holes from being aligned with the embedded sleeves after the precast wall is lifted to the designated position, auxiliary ropes need to be added to the side of the steel platform. Workers pull the auxiliary ropes from the side to ensure the accurate and stable descent of the precast wall.

[0004] However, during the lifting and movement of precast walls, the auxiliary rope can only provide lateral traction after the wall has been lifted to the designated position. If an anti-fall device is added to the existing steel cable hook, that is, a blocking bar is added to the hook tip, after the precast wall is hoisted to the predetermined position, the anti-fall device requires construction workers to climb to the top of the wall to release it, thus separating the precast wall from the steel cable, which is quite dangerous. Therefore, anti-fall design is not used in most cases when hoisting precast walls. However, there is a significant safety hazard in windy weather, as the precast wall may loosen or detach from the hook, potentially damaging the precast wall, increasing material costs, and threatening the safety of on-site construction workers. To address this, we propose a precast component lifting machine. Summary of the Invention

[0005] The purpose of this invention is to provide a precast component lifting machine to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a precast component lifting machine, comprising:

[0007] Tower crane;

[0008] The main body of the steel platform is fixed to the bottom of the tower crane hook by steel wire ropes;

[0009] The connecting mechanism is installed below the main body of the steel platform and connects the precast wall panels to the main body of the steel platform.

[0010] An adjustment mechanism is installed between the connecting mechanism and the main body of the steel platform. The adjustment mechanism adjusts the distance between the two connecting mechanisms so that the angle between the connecting mechanism and the precast wall is greater than 60 degrees.

[0011] A limiting mechanism is installed on one side of the connecting mechanism to prevent the connecting mechanism from disengaging from the precast wall panel.

[0012] The detachment mechanism is installed on one side of the limiting mechanism. After the precast wall is lifted to the building installation position, the detachment mechanism releases the limiting mechanism and detaches the connecting mechanism from the precast wall.

[0013] Preferably, the connecting mechanism includes a sliding block installed inside the main body of the steel platform. The main body of the steel platform has a channel steel cross-section. A rubber pad is fixedly connected to the bottom of the sliding block. An installation platform is fixedly connected to the bottom of the sliding block by a steel cable. A connecting hook is rotatably connected to the bottom of the installation platform.

[0014] Preferably, the adjustment mechanism includes two racks mounted on the top of the two sliding blocks, with a gear between the two racks. The gear is rotatably connected to the main body of the steel platform, and the outer side of the gear meshes with the two racks respectively.

[0015] Preferably, the bottom of the gear is provided with a disc that limits the gear and two racks, and the disc is fixedly connected to the gear's shaft.

[0016] Preferably, the limiting mechanism includes a limiting plate rotatably connected to one side of the hook handle, the limiting plate being rotatably connected to the hook handle, a torsion spring being provided between the pivot of the limiting plate and the hook handle, a limiting rope being fixedly connected to the surface of the limiting plate, a guide sleeve being fixedly connected to the top of the limiting rope, a guide post being slidably connected inside the guide sleeve, the guide post being fixedly connected to the sliding block, a limiting spring being provided between the guide post and the guide sleeve, and the two ends of the limiting spring being fixedly connected to the guide post and the guide sleeve respectively.

[0017] Preferably, the release mechanism includes a release rope fixedly connected to one side of the hook handle of the connecting hook. The release rope is arranged opposite to the limiting plate and passes through the main body of the steel platform, located on one side of the main body of the steel platform.

[0018] Preferably, a positioning element for locking or releasing the release rope is provided between the release rope and the limiting mechanism. The positioning element includes a positioning post fixedly connected to the release rope, a plurality of positioning holes on the positioning post, a positioning cylinder fixedly connected to the bottom of the sliding block, the positioning post and the positioning cylinder being slidably connected, a positioning pin being slidably connected to the outside of the positioning cylinder, a positioning spring being provided between the positioning pin and the positioning cylinder, the two ends of the positioning spring being fixedly connected to the positioning cylinder and the positioning pin respectively, a guide cylinder being fixedly connected to the bottom of the sliding block, a guide frame being slidably connected inside the guide cylinder, and the guide frame abutting against the tail of the positioning pin.

[0019] Preferably, the end of the guide frame is arc-shaped, the end of the positioning pin is beveled, and the guide frame and the guide sleeve are connected by a connecting rod.

[0020] Preferably, the pivot of the connecting hook is eccentrically positioned relative to the mounting platform, and the hook bend is located on the extension line of the steel cable axis.

[0021] The present invention has at least the following beneficial effects:

[0022] The precast wall is connected and limited to the main body of the steel platform through a connecting mechanism and a limiting mechanism. After the precast wall is transported to the installation position and fixed, the limiting mechanism and the connecting mechanism are detached from the precast wall through a detachment mechanism. Compared with the existing technology, there are significant safety hazards in windy weather, as the precast wall may loosen or detach from the hook, potentially damaging the precast wall, increasing material costs, and threatening the safety of on-site construction personnel. The limiting mechanism of this invention can limit the connecting mechanism from the precast wall, preventing relative detachment between the precast wall and the connecting mechanism during transportation. After installation at the installation position, the detachment mechanism can both pull the precast wall to the correct position and detach the limiting mechanism and the connecting mechanism from the precast wall after installation, thereby ensuring that the precast wall will not detach during transportation, reducing damage costs during lifting, and ensuring the safety of workers. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a structural diagram of the steel platform of the present invention;

[0025] Figure 3 This is a partial view of the connecting mechanism of the present invention;

[0026] Figure 4 This is a structural diagram of the detached mechanism of the present invention;

[0027] Figure 5 This is a partial view of the limiting mechanism of the present invention;

[0028] Figure 6 This is a partial view of the positioning component of the present invention;

[0029] Figure 7 This is a partial cross-sectional view of the positioning component of the present invention;

[0030] Figure 8 This is a diagram showing the lifting state of the prefabricated wall structure according to the present invention;

[0031] Figure 9 This is a diagram of existing technology.

[0032] In the diagram: 1-Tower crane; 2-Steel platform body; 3-Connecting mechanism; 31-Sliding block; 32-Rubber pad; 33-Steel cable; 34-Mounting platform; 35-Connecting hook; 4-Adjusting mechanism; 41-Rack; 42-Gear; 43-Disc; 5-Limiting mechanism; 51-Limiting plate; 52-Torsion spring; 53-Limiting rope; 54-Guide sleeve; 55-Guide column; 56-Limiting spring; 6-Release mechanism; 61-Release rope; 7-Positioning component; 71-Positioning column; 72-Positioning hole; 73-Positioning cylinder; 74-Positioning pin; 75-Positioning spring; 76-Guide cylinder; 77-Guide frame; 78-Connecting rod; 8-Precast wall. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figure 1-9 The present invention provides a technical solution:

[0035] Example 1,

[0036] A precast component lifting machine, comprising:

[0037] Tower crane 1;

[0038] The main body of the steel platform 2 is fixed to the bottom of the hook of the tower crane 1 by steel wire rope;

[0039] The connecting mechanism 3 is installed below the main body of the steel platform 2. The connecting mechanism 3 connects the precast wall panel to the main body of the steel platform 2. The connecting mechanism 3 facilitates the connection of the precast wall 8, thereby facilitating the lifting of the tower crane 1.

[0040] Adjustment mechanism 4 is installed between connection mechanism 3 and steel platform body 2. Adjustment mechanism 4 adjusts the distance between the two connection mechanisms 3 so that the angle between connection mechanism 3 and precast wall 8 is greater than 60 degrees. Adjustment mechanism 4 can be adjusted to a connection position suitable for precast wall 8, so that the angle between steel cable 33 and precast wall 8 is greater than 60 degrees, thereby reducing the pull of steel cable 33 on precast wall 8, reducing the stress on precast wall 8, and ensuring safe and stable lifting of precast wall 8 during the lifting process;

[0041] The limiting mechanism 5 is installed on one side of the connecting mechanism 3. The limiting mechanism 5 restricts the connection mechanism 3 from detaching from the precast wall panel. The limiting mechanism 5 can directly block the outside of the connecting hook 35 after the connecting hook 35 is connected to the precast wall 8, reducing the possibility of the precast wall 8 falling off the connecting hook 35 and ensuring the safety of the precast wall 8.

[0042] The detachment mechanism 6 is installed on one side of the limiting mechanism 5. After the precast wall 8 is lifted to the building installation position, the detachment mechanism 6 releases the limiting mechanism 5 and detaches the connecting mechanism 3 from the precast wall 8. The detachment mechanism 6 can facilitate the pulling of the precast wall 8 to the accurate position after it is transported to the designated position, reducing the difficulty of alignment caused by strong winds blowing the precast wall 8. On the other hand, after alignment and installation, it can facilitate the detachment of the limiting mechanism 5 and the connecting hook 35 from the precast wall 8, making it more convenient for workers to operate.

[0043] The connecting mechanism 3 includes a sliding block 31 installed inside the steel platform body 2. The sliding block 31 can slide relative to the inner wall of the steel platform body 2. The cross section of the steel platform body 2 is in the shape of a channel steel. A rubber pad 32 is fixedly connected to the bottom of the sliding block 31. An installation platform 34 is fixedly connected to the bottom of the sliding block 31 through a steel cable 33. A connecting hook 35 is rotatably connected to the bottom of the installation platform 34.

[0044] The adjusting mechanism 4 includes two racks 41 mounted on top of two sliding blocks 31. Each rack 41 is fixedly connected to its corresponding sliding block 31. A gear 42 is provided between the two racks 41, and the gear 42 is rotatably connected to the steel platform body 2 via a rotating shaft. The outer side of the gear 42 meshes with each of the two racks 41. When the precast wall 8 needs to be lifted, the connecting hook 35 on one side is pulled. The connecting hook 35 pulls the sliding block 31 to slide on the steel platform body 2, thereby causing one of the sliding blocks 31 to move the rack 41. 41 drives gear 42 to rotate, gear 42 drives rack 41 on the other side to move, and then the sliding blocks 31 on both sides move synchronously towards or away from each other. After adjusting to a suitable length for the precast wall 8, the connecting hook 35 is hung on the steel ring at the top of the precast wall 8. When the tower crane 1 is used to lift the steel platform body 2, the rubber pad 32 at the bottom of the sliding block 31 will press against the steel platform body 2, and the sliding block 31 will be limited to move along the length of the steel platform body 2, thus ensuring that the sliding block 31 can stably lift the precast wall 8.

[0045] The bottom of the gear 42 is provided with a disc 43 that limits the gear 42 and the two racks 41. The disc 43 is fixedly connected to the shaft of the gear 42. The disc 43 can maintain the stability of the meshing between the racks 41 and the gear 42 and facilitate the adjustment between the two sliding blocks 31.

[0046] The limiting mechanism 5 includes a limiting plate 51 rotatably connected to one side of the hook handle of the connecting hook 35. The limiting plate 51 is rotatably connected to the hook handle. A torsion spring 52 is provided between the pivot of the limiting plate 51 and the hook handle. A limiting rope 53 is fixedly connected to the surface of the limiting plate 51. The limiting rope 53 passes through the mounting platform 34. The length of the limiting rope 53 is less than the length of the steel cable 33. A guide sleeve 54 is fixedly connected to the top of the limiting rope 53. A guide post 55 is slidably connected inside the guide sleeve 54. The guide post 55 is fixedly connected to the sliding block 31. A limiting spring 56 is provided between the guide post 55 and the guide sleeve 54. The two ends of the limiting spring 56 are fixedly connected to the guide post 55 and the guide sleeve 54, respectively. Under the action of the torsion spring 52, the limiting plate 51 is normally in contact with the hook handle. This means that the item can normally enter the connecting hook 35. When the connecting hook 35 hooks up the precast wall 8, the weight of the precast wall 8 acts on the steel cable 33, which is tightened. At the same time, the limiting rope 53 is also tightened. The limiting rope 53 pulls the limiting plate 51 to press against the hook tip. The limiting rope 53 pulls the guide sleeve 54 to move relative to the guide post 55. The limiting spring 56 is stretched, which can limit the pull ring of the precast component inside the connecting hook 35, reducing the possibility of the connecting hook 35 disengaging from the pull ring and ensuring the safety of on-site personnel. After the precast wall 8 is lifted to the installation position, the steel cable 33 loosens, the limiting rope 53 is released, the limiting spring 56 drives the guide sleeve 54 to move towards the guide post 55, and then the limiting plate 51 is released.

[0047] The release mechanism 6 includes a release rope 61 fixedly connected to one side of the hook handle of the connecting hook 35. The release rope 61 is arranged opposite to the limiting plate 51. The release rope 61 passes through the steel platform body 2 and is located on one side of the steel platform body 2. The release rope 61 can pull the connecting hook 35 to move, and then pull the steel cable 33 to move. Thus, when the precast wall 8 is in a suspended state, the entire precast wall 8 can be pulled to move, making it easier to pull the precast wall 8 to the installation position. After the precast wall 8 is installed, pulling the release rope 61 again will cause the connecting hook 35 to rotate, disengaging the connecting hook 35 from the collar, making it easier to disengage the connecting hook 35 from the precast wall 8 and facilitating subsequent lifting.

[0048] According to the above embodiments, Embodiment Two

[0049] A positioning element 7 is provided between the release rope 61 and the limiting mechanism 5 to lock or release the release rope 61. The positioning element 7 includes a positioning post 71 fixedly connected to the release rope 61. The positioning post 71 has multiple positioning holes 72. A positioning cylinder 73 is fixedly connected to the bottom of the sliding block 31. The positioning post 71 and the positioning cylinder 73 are slidably connected. A positioning pin 74 is slidably connected to the outside of the positioning cylinder 73. The positioning pin 74 can be inserted into the positioning hole 72 to limit the relative positioning of the positioning cylinder 73 and the positioning post 71. A positioning spring 75 is provided between the positioning pin 74 and the positioning cylinder 73. The two ends of the positioning spring 75 are fixedly connected to the positioning cylinder 73 and the positioning pin 74, respectively. The bottom of the sliding block 31 is fixedly connected to the guide cylinder 76. The guide frame 77 is slidably connected inside the guide cylinder 76. The guide frame 77 abuts against the tail of the positioning pin 74. When the precast wall 8 is lifted, the downward movement of the guide sleeve 54 will drive the connecting rod 78 to move downward. After the connecting rod 78 moves downward, it can drive the guide frame 77 to move downward. The guide frame 77 moves relative to the guide cylinder 76 and abuts against the side of the positioning pin 74. The positioning spring 75 is stretched. At this time, the positioning pin 74 is inserted. The positioning pin 71 and positioning cylinder 73 are positioned within the positioning hole 72. After being lifted to the installation position, the release rope 61 is pulled again. The force of the release rope 61 acts on the positioning cylinder 73 and positioning pin 71, and then on the sliding block 31, thus not affecting the connecting hook 35. This reduces the possibility of relative movement between the connecting hook 35 and the collar when the release rope 61 is pulled, allowing the precast wall 8 to be pulled closer to the installation position easily and stably. After the precast wall 8 is moved to the installation position and installed, the guide sleeve 54 will rise, and then... The guide frame 77 is moved upward by the connecting rod 78, the guide frame 77 disengages from the positioning pin 74, the positioning spring 75 rebounds, and the positioning pin 74 disengages from the positioning cylinder 73. The positioning cylinder 73 separates from the positioning post 71, so that the release rope 61 can be pulled again to drive the connecting hook 35 to rotate. Then the connecting hook 35 can be disengaged from the collar of the precast wall 8. This ensures the stability of the connecting hook 35 when the release rope 61 pulls the precast wall 8, and facilitates the separation between the connecting hook 35 and the collar of the precast wall 8, making it more convenient for workers to use.

[0050] The end of the guide frame 77 is arc-shaped, and the end of the positioning pin 74 is beveled. The guide frame 77 and the guide sleeve 54 are connected by a connecting rod 78. The beveled positioning pin 74 and the arc-shaped guide frame 77 can facilitate the movement of the positioning pin 74, making it more convenient for staff to use.

[0051] The pivot of the connecting hook 35 is eccentrically positioned relative to the mounting platform 34, which facilitates the release of the rope 61 from the precast wall 8. The hook bend of the connecting hook 35 is located on the extension line of the steel cable 33 axis, keeping the force-bearing position of the connecting hook 35 in a straight line with the axis of the steel cable 33, thereby ensuring the stability of the connecting hook 35 in lifting the precast wall 8.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A precast member hoist characterized by: The utility model relates to a steel platform body (2) is fixed in the bottom of tower crane (1) hook through steel cable, and the prefabricated wall plate is connected with the steel platform body (2) through the connecting mechanism (3) installed below the steel platform body (2), and the distance between the two connecting mechanisms (3) is adjusted through the adjusting mechanism (4) installed between the connecting mechanism (3) and the steel platform body (2), so that the included angle between the connecting mechanism (3) and the prefabricated wall (8) is greater than 60 degrees, the disengagement between the connecting mechanism (3) and the prefabricated wall plate is limited through the limiting mechanism (5) installed on one side of the connecting mechanism (3), and the connecting mechanism (3) is separated from the prefabricated wall (8) after the limiting mechanism (5) is loosened and the prefabricated wall (8) is lifted to the building installation position through the disengagement mechanism (6) installed on one side of the limiting mechanism (5). The utility model relates to a steel platform body (2) is fixed in the bottom of tower crane (1) hook through steel cable, and the prefabricated wall plate is connected with the steel platform body (2) through the connecting mechanism (3) installed below the steel platform body (2), and the distance between the two connecting mechanisms (3) is adjusted through the adjusting mechanism (4) installed between the connecting mechanism (3) and the steel platform body (2), so that the included angle between the connecting mechanism (3) and the prefabricated wall (8) is greater than 60 degrees, the disengagement between the connecting mechanism (3) and the prefabricated wall plate is limited through the limiting mechanism (5) installed on one side of the connecting mechanism (3), and the connecting mechanism (3) is separated from the prefabricated wall (8) after the limiting mechanism (5) is loosened and the prefabricated wall (8) is lifted to the building installation position through the disengagement mechanism (6) installed on one side of the limiting mechanism (5). The utility model relates to a steel platform body (2) is fixed in the bottom of tower crane (1) hook through steel cable, and the prefabricated wall plate is connected with the steel platform body (2) through the connecting mechanism (3) installed below the steel platform body (2), and the distance between the two connecting mechanisms (3) is adjusted through the adjusting mechanism (4) installed between the connecting mechanism (3) and the steel platform body (2), so that the included angle between the connecting mechanism (3) and the prefabricated wall (8) is greater than 60 degrees, the disengagement between the connecting mechanism (3) and the prefabricated wall plate is limited through the limiting mechanism (5) installed on one side of the connecting mechanism (3), and the connecting mechanism (3) is separated from the prefabricated wall (8) after the limiting mechanism (5) is loosened and the prefabricated wall (8) is lifted to the building installation position through the disengagement mechanism (6) installed on one side of the limiting mechanism (5). ​ ​ ​ ​ ​ ​ ​ ​ ​ The disengagement rope (61) can pull the connecting hook (35) to move, and then pull the steel cable (33) to move, so that the whole prefabricated wall (8) is pulled to move when the prefabricated wall (8) is in a suspended state, so that the prefabricated wall (8) is conveniently pulled to the installation position, and after the prefabricated wall (8) is installed, the disengagement rope (61) is pulled again, and the disengagement rope (61) pulls the connecting hook (35) to rotate, so that the connecting hook (35) is disengaged from the sleeve ring; The disengagement rope (61) is provided with a positioning piece (7) between the limiting mechanism (5), which locks or releases the disengagement rope (61), the positioning piece (7) comprises a positioning column (71) fixedly connected to the disengagement rope (61), a plurality of positioning holes (72) are formed in the positioning column (71), the bottom of the sliding block (31) is fixedly connected with a positioning cylinder (73), the positioning column (71) and the positioning cylinder (73) are in sliding connection, the outer side of the positioning cylinder (73) is slidably connected with a positioning pin (74), the positioning pin (74) and the positioning cylinder (73) are provided with a positioning spring (75), and the two ends of the positioning spring (75) are fixedly connected with the positioning cylinder (73) and the positioning pin (74), respectively. The end of the positioning pin (74) is a slope, and the end of the guide frame (77) is in arc shape. When the prefabricated wall (8) is lifted, the downward movement of the guide sleeve (54) drives the connecting rod (78) to move downward, and the connecting rod (78) drives the guide frame (77) to move downward after moving downward, the guide frame (77) moves relative to the guide cylinder (76), the guide frame (77) abuts against the side surface of the positioning pin (74), and the positioning spring (75) is stretched, so that the positioning pin (74) is inserted into the positioning hole (72). After the prefabricated wall (8) is moved to the installation position and installed, the guide sleeve (54) rises, and then drives the guide frame (77) to move upward through the connecting rod (78), the guide frame (77) is separated from the positioning pin (74), the positioning spring (75) rebounds, drives the positioning pin (74) to separate from the positioning cylinder (73), and the positioning cylinder (73) and the positioning column (71) are relatively separated, so that the connecting hook (35) can be rotated after the disengagement rope (61) is pulled again, and then the connecting hook (35) can be separated from the sleeve ring of the prefabricated wall (8).

2. A precast member lift according to claim 1, wherein: The cross section of the steel platform body (2) is in the shape of a channel steel, and the bottom of the sliding block (31) is fixedly connected with a rubber pad (32).

3. A precast member lift according to claim 2, wherein: The adjusting mechanism (4) comprises two racks (41) mounted on the top of the two sliding blocks (31), and a gear (42) is arranged between the two racks (41), the gear (42) is in rotation connection with the steel platform body (2), and the outer side of the gear (42) is in mesh with the two racks (41), respectively.

4. A precast member lift according to claim 3, wherein: The bottom of the gear (42) is provided with a disc (43) limiting the gear (42) and the two racks (41), and the disc (43) is fixedly connected with the rotating shaft of the gear (42).

5. A precast member lift according to claim 1 wherein: The rotating shaft of the connecting hook (35) is eccentrically arranged relative to the mounting table (34), and the hook bend of the connecting hook (35) is located on the extended line of the axis of the steel cable (33).

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