Universal type splicing platform for fan tower drum

Abstract

The invention relates to the technical field of concrete tower drum splicing, in particular to a universal splicing platform for a fan tower drum, which comprises a main body component, a rotating component and a limiting component, the main body component comprises a moving component and a rotating component fixed at the top of the moving component, the limiting component is fixed at the top of the rotating component, and a ring piece can be placed at the top of the limiting component; then, the moving assembly and the rotating assembly can enable the ring piece to move and adjust the angle; according to the device, the ring piece is placed on the limiting assembly, then the adjusting assembly relieves limiting of the correcting assembly on the rotating assembly, the lever assembly drives the stress assembly and the connecting assembly to drive the rotating assembly to move, and therefore the ring piece can be corrected. Angles of the ring pieces on the limiting assembly can be adjusted, the moving range of the stress assembly is limited by the track assembly, and therefore the problem that the ring pieces collide with one another due to the fact that the adjusting angle is too large is solved.

Description

Technical Field

[0001] The invention relates to the technical field of concrete tower assembly, in particular to a universal assembly platform for wind turbine towers. Background Art

[0002] With the country's support for the development of new energy, the requirements for installed capacity of new energy wind power generation are getting higher and higher, and the wind force required for high-capacity cabins is also getting higher and higher. Steel towers can no longer meet the development of the installed height of new energy wind power generation at this stage. Concrete is made into towers for new energy wind power generation by utilizing its high rigidity, easy installation and low cost to meet the required installation height of high-capacity cabins. As the installed height becomes higher and higher, the diameter of the concrete tower becomes larger and larger. In order to meet the transportation of transport vehicles and meet road transportation regulations and systems, the concrete tower needs to be disassembled and transported to the machine site for assembly.

[0003] When the existing assembly platform is in use, a crane and manual labor are required to move the ring segments to the assembly platform, and then after measuring the angle, a jack is used to calibrate the ring segments. This process is labor-intensive and results in a long assembly time, which requires improvement. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the problem that the calibration and assembly of the ring segments are relatively complicated when assembling the tower ring segments mentioned above or in the prior art, the present invention is proposed.

[0006] Therefore, an object of the present invention is to provide a universal assembly platform for wind turbine towers.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a main body component, which includes a moving component, and a rotating component fixed to the top of the moving component, and also includes a limiting component fixed to the top of the rotating component, a ring piece can be placed on the top of the limiting component, and then the moving component and the rotating component can enable the ring piece to move and adjust the angle; a proofreading component, which includes a lever component rotating on the rotating component, and a force-bearing component sliding in the lever component, and also includes a connecting component sliding on the force-bearing component, the connecting component is connected to the rotating component, and also includes a fixed The track assembly on the movable assembly is adapted to the force-bearing assembly. Pushing the lever assembly can drive the force-bearing assembly to squeeze the connecting assembly, so that the connecting assembly can drive the rotating assembly to move, and the moving angle of the force-bearing assembly will be limited by the track assembly; an adjusting component, which includes a slot plate assembly fixed to the outer wall of the lever assembly, and a clamping assembly sliding in the slot plate assembly. The clamping assembly is connected to the force-bearing assembly, and the clamping assembly adjusts the clamping position on the slot plate assembly. The clamping assembly can drive the force-bearing assembly to be limited by different angles of the track assembly.

[0008] As a preferred solution of the universal wind turbine tower assembly platform of the present invention, the moving component includes a center disk, and slide rails fixed to the four ends of the center disk, and also includes slide plates sliding on the top of the slide rails corresponding to the four ends of the center disk.

[0009] As a preferred solution of the universal wind turbine tower assembly platform of the present invention, the rotating component includes an arc-shaped bottom plate fixed to the top of the slide plate, and an arc-shaped concave plate sliding on the top of the arc-shaped bottom plate, and a groove is provided in the center of the outer wall of the arc-shaped concave plate.

[0010] As a preferred solution of the universal wind turbine tower assembly platform of the present invention, the limiting component includes a support plate fixed to the top of the arc-shaped concave plate, the top of the support plate is provided with a groove, and the inner side of the top of the support plate is provided with a convex end.

[0011] As a preferred solution of the universal assembly platform of the wind turbine tower of the present invention, the lever assembly includes a tilting rod rotating on the outside of the rotating assembly, the inner wall of the tilting rod is provided with a circular groove, the tilting rod is provided with a through groove at one end inside the circular groove, and the tilting rod is provided with an adjustment groove at one end outside the circular groove, and the circular groove, the through groove and the adjustment groove are connected.

[0012] As a preferred solution of the universal wind turbine tower assembly platform of the present invention, the force-bearing component includes a sliding rod sliding in the circular groove, and a force-bearing rod fixed at the end of the sliding rod and located in the through groove.

[0013] As a preferred solution of the universal wind turbine tower assembly platform of the present invention, the connection component includes a triangular plate fixed to the outer wall of the rotating component, and straight grooves are provided on the upper and lower ends of the triangular plate, and the straight grooves are adapted to the force-bearing component.

[0014] As a preferred solution of the universal assembly platform for wind turbine towers of the present invention, the track assembly includes a frame fixed on the moving assembly, the frame has fan-shaped grooves at the upper and lower ends, and semicircular grooves are provided at the upper and lower ends of the frame corresponding to the small sections of the fan-shaped grooves, and the semicircular grooves are adapted to the force-bearing assembly.

[0015] As a preferred solution of the universal assembly platform of the wind turbine tower of the present invention, the slot plate assembly includes a slot plate fixed on the outer wall of the tilting rod at the corresponding adjustment slot, a connecting slot is provided inside the slot plate at the corresponding adjustment slot, the adjusting slot and the connecting slot are connected, and a card slot is provided on the top of the slot plate at the corresponding connection slot.

[0016] As a preferred solution of the universal assembly platform of the wind turbine tower of the present invention, the clamping component includes a connecting block fixed to one end of the outer side of the force-bearing component, the top of the connecting block is provided with an inward groove, and a clamping block sliding in the inward groove, and also includes a tension spring fixed between the connecting block and the clamping block, and the clamping block and the slot plate assembly are adapted.

[0017] The beneficial effects of the universal wind turbine tower assembly platform of the present invention are as follows: the present invention places the ring piece on the limit component, and then the adjusting component releases the limit of the rotating component by the proofreading component, and drives the force-bearing component and the connecting component to move the rotating component through the lever component, so that the ring piece on the limit component can be adjusted in angle, and the moving range of the force-bearing component is limited by the track component, so the problem of collision between the ring pieces due to excessive adjustment angle is avoided, and the moving component can move the ring piece on the limit component toward the center, thereby reducing the subsequent tedious measurement and proofreading work when assembling the ring pieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 This is an overall schematic diagram of the universal assembly platform for wind turbine towers.

[0020] Figure 2 This is a schematic diagram of the partial internal structure of the universal assembly platform for wind turbine towers.

[0021] Figure 3 This is a schematic diagram of the structure of the main components of the universal assembly platform for wind turbine towers.

[0022] Figure 4 This is a schematic diagram of the partial structure of the main components of the universal assembly platform for wind turbine towers.

[0023] Figure 5 This is a schematic diagram of the proofreading component structure in the universal assembly platform for wind turbine towers.

[0024] Figure 6 This is a schematic diagram of the lever assembly structure in the universal assembly platform of the wind turbine tower.

[0025] Figure 7 This is a schematic diagram of the structure of the force-bearing components and connection components in the universal assembly platform of the wind turbine tower.

[0026] Figure 8 This is a schematic diagram of the track component structure in the universal assembly platform for wind turbine towers.

[0027] Fig. 9 This is a schematic diagram of the structure of the adjustment components in the universal assembly platform of the wind turbine tower.

[0028] Fig.10 This is a schematic diagram of the structure of the snap-on components in the universal assembly platform for wind turbine towers.

[0029] In the figure: 100, main body; 101, moving assembly; 102, rotating assembly; 103, limiting assembly; 101a, center plate; 101b, slide rail; 101c, slide plate; 102a, arc-shaped bottom plate; 102b, arc-shaped concave plate; 102c, slot; 103a, support plate; 103b, groove; 103c, raised end; 200, proofreading component; 201, lever assembly; 202, force-bearing assembly; 203, connecting assembly; 204, track assembly; 201a, tilting rod; 201b, round groove; 201c, through groove; 201d, adjustment groove; 202a, sliding rod; 202b, load-bearing rod; 203a, triangular plate; 203b, straight groove; 204a, frame; 204b, fan-shaped groove; 204c, semicircular groove; 300, adjustment component; 301, slot plate assembly; 302, clamping assembly; 301a, slot plate; 301b, connecting slot; 301c, card slot; 302a, connecting block; 302b, recessed groove; 302c, clamping block; 302d, tension spring. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0031] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0032] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0033] Example 1, reference Figure 1 to Figure 4 , is the first embodiment of the present invention, which provides a universal wind turbine tower assembly platform, which can achieve the effect of facilitating the assembly and calibration of tower ring segments, and includes a main body component 100, which includes a moving component 101, and a rotating component 102 fixed to the top of the moving component 101, and also includes a limiting component 103 fixed to the top of the rotating component 102, and the ring segment can be placed on the top of the limiting component 103, and then the moving component 101 and the rotating component 102 can make the ring segment movable and angle-adjustable; The calibration component 200 includes a lever component 201 rotating on the rotating component 102, and a force component 202 sliding inside the lever component 201, and also includes a connecting component 203 sliding on the force component 202, the connecting component 203 is connected to the rotating component 102, and also includes a track component 204 fixed on the moving component 101, the track component 204 and the force component 202 are adapted, pushing the lever component 201 can drive the force component 202 to squeeze the connecting component 203, so that the connecting component 203 can drive the rotating component 102 to move, and the moving angle of the force component 202 will be limited by the track component 204; The adjusting component 300 includes a slot plate assembly 301 fixed to the outer wall of the lever assembly 201, and a clamping assembly 302 sliding inside the slot plate assembly 301. The clamping assembly 302 is connected to the force-bearing assembly 202. The clamping assembly 302 adjusts the clamping position on the slot plate assembly 301. The clamping assembly 302 can drive the force-bearing assembly 202 to be limited by different angles of the track assembly 204.

[0034] Specifically, Figure 3In the figure, the moving component 101 includes a center disk 101a, and slide rails 101b fixed to the four ends of the center disk 101a. There are eight slide rails 101b in total. Each of the four ends of the center disk 101a has two slide rails 101b, so that the eight slide rails 101b are arranged in a cross shape, and also include slide plates 101c sliding on the top of the slide rails 101b corresponding to the four ends of the center disk 101a. There is a slide plate 101c on the two slide rails 101b on each end of the center disk 101a.

[0035] Further, such as Figure 4 In the embodiment, the rotating assembly 102 includes an arc-shaped bottom plate 102a fixed to the top of the slide plate 101c, and an arc-shaped concave plate 102b sliding on the top of the arc-shaped bottom plate 102a. A groove 102c is provided at the center of the outer wall of the arc-shaped concave plate 102b.

[0036] Further, such as Figure 4 In the figure, the limiting assembly 103 includes a support plate 103a fixed to the top of the arc-shaped concave plate 102b, a groove 103b is provided on the top of the support plate 103a, and the shape of the groove 103b is arc-shaped, so that the ring piece of the tower can be placed in the groove 103b, and a raised end 103c is provided on the inner side of the top of the support plate 103a.

[0037] When in use, the tower ring piece is roughly moved to the top of the support plate 103a by using a crane, and the tower ring piece is lowered by the crane, and the angle of the tower ring piece is manually adjusted to make the tower ring piece fit to the convex end 103c of the groove 103b, so that the angle of the tower ring piece fits the groove 103b, and the crane is lowered to make the tower ring piece fall into the groove 103b, and then the arc-shaped concave plate 102b is slowly pushed to drive the support plate 103a, the tower ring piece, and the slide plate 101c to the center plate 10 1a is approached, and during this process, the adjustment component 300 can contact the proofreading component 200 to limit the arc bottom plate 102a and the arc concave plate 102b, so that the arc concave plate 102b can be driven to slide on the arc bottom plate 102a by the proofreading component 200, and then the top support plate 103a of the arc concave plate 102b and the tower ring segment can be driven, and the angle of the tower ring segment can be adjusted, so that each tower ring segment has enough space to be placed, and then spliced ​​by adjusting the angle.

[0038] In summary, after placing the tower ring segment on the limiting component 103 and releasing the limiting of the rotating component 102 by the proofreading component 200 through the adjusting component 300, the lever component 201 can drive the force-bearing component 202 and the connecting component 203 to drive the rotating component 102 to move, and when moving, the force-bearing component 202 is limited by the track component 204, so that the tower ring segment on the limiting component 103 can be adjusted in angle, and the moving component 101 can move the tower ring segment on the limiting component 103 toward the center, thereby reducing the subsequent tedious measurement and proofreading work when assembling the tower ring segment.

[0039] Example 2, reference Figures 1 to 8 , which is the second embodiment of the present invention. Different from the previous embodiment, this embodiment provides a calibration component 200 of a universal wind turbine tower assembly platform, which solves the problem of calibrating the tower ring on the rotating assembly 102, such as Figure 6 In it, the lever assembly 201 includes a lever 201a rotating on the outside of the rotating assembly 102, the lever 201a rotates on the outer wall of the arc-shaped bottom plate 102a in the rotating assembly 102 at the corresponding slot 102c, the inner wall of the lever 201a is provided with a circular groove 201b, the lever 201a is located at one end inside the circular groove 201b and is provided with a through groove 201c, the lever 201a is located at one end outside the circular groove 201b and is provided with an adjustment groove 201d, the circular groove 201b, the through groove 201c and the adjustment groove 201d are connected.

[0040] Specifically, Figure 7 In the embodiment, the force bearing assembly 202 includes a slide bar 202a sliding in the circular groove 201b, and a force bearing rod 202b fixed at the end of the slide bar 202a and located in the through groove 201c.

[0041] Further, such as Figure 7 In the figure, the connecting component 203 includes a triangular plate 203a fixed to the outer wall of the rotating component 102. The triangular plate 203a is fixed to the outer wall of the arc-shaped concave plate 102b in the rotating component 102 at the corresponding groove 102c. The upper and lower ends of the triangular plate 203a are provided with straight grooves 203b. The straight grooves 203b are adapted to the force-bearing component 202. The straight grooves 203b are adapted to the force-bearing rod 202b in the force-bearing component 202.

[0042] Further, such as Figure 8 In the figure, the track component 204 includes a frame 204a fixed on the moving component 101, the frame 204a is connected to the slide 101c in the moving component 101, and fan-shaped grooves 204b are provided at the upper and lower ends of the frame 204a. Semicircular grooves 204c are provided at the small sections corresponding to the fan-shaped grooves 204b at the upper and lower ends of the frame 204a. The semicircular grooves 204c are adapted to the force-bearing component 202, and the semicircular grooves 204c are adapted to the force-bearing rod 202b in the force-bearing component 202.

[0043] The rest of the structure is the same as that of Example 1.

[0044] When in use, when the rotating assembly 102 needs to be adjusted, the adjusting component 300 can drive the sliding rod 202a and the force-bearing rod 202b to move outward, so that the force-bearing rod 202b will enter the fan-shaped groove 204b from the semicircular groove 204c. After the force-bearing rod 202b is separated from the semicircular groove 204c, the limit of the rotating assembly 102 by the proofreading component 200 can be released. Because the semicircular groove 204c is at the small end of the fan-shaped groove 204b, the sliding rod 202a and the force-bearing rod 202b can be driven by the adjusting component 300 to continue to move to the large end of the fan-shaped groove 204b, thereby improving the force-bearing rod 202 b has a moving range in the fan-shaped groove 204b. After the force-bearing component 202 is adjusted, the sliding rod 202a and the force-bearing rod 202b are driven to rotate by pushing the tilting rod 201a, so that the force-bearing rod 202b will squeeze the triangular plate 203a and the arc-shaped concave plate 102b in the straight groove 203b to move, thereby completing the angle adjustment of the tower ring segment on the top limit component 103 of the arc-shaped concave plate 102b. In this process, the maximum moving range of the force-bearing rod 202b is from the center of the fan-shaped groove 204b to the edges on both sides of the fan-shaped groove 204b, thereby completing the function of calibrating the tower ring segment on the rotating component 102.

[0045] In summary, the distance that the calibration component 200 can drive the rotating assembly 102 to move can be adjusted by observing the approximate angle deviation of the tower ring segment, thereby avoiding collision between the tower ring segment and the adjusted tower ring segment during adjustment, thereby improving the safety during the tower ring segment adjustment process.

[0046] Example 3, reference Figures 1 to 10 , which is the third embodiment of the present invention. Different from the previous embodiment, this embodiment provides an adjustment component 300 of a universal assembly platform for a wind turbine tower, which has the function of adjusting and calibrating the component 200, such as Fig. 9 In it, the slot plate assembly 301 includes a slot plate 301a fixed on the outer wall of the tilting rod 201a at a position corresponding to the adjustment slot 201d, a connecting slot 301b is provided inside the slot plate 301a at a position corresponding to the adjustment slot 201d, the adjustment slot 201d and the connecting slot 301b are connected, a card slot 301c is provided at the top of the slot plate 301a at a position corresponding to the connection slot 301b, and there are multiple card slots 301c on the slot plate 301a.

[0047] Specifically, Fig.10 In the figure, the snap-in assembly 302 includes a connecting block 302a fixed to one end of the outer side of the force-bearing assembly 202, a sunken groove 302b is provided on the top of the connecting block 302a, and a snap-in block 302c sliding in the sunken groove 302b, and also includes a tension spring 302d fixed between the connecting block 302a and the snap-in block 302c, and the snap-in block 302c is adapted to the slot plate assembly 301.

[0048] The rest of the structure is the same as that of Example 2.

[0049] When in use, by pulling the block 302c out of the first slot 301c and pulling the tension spring 302d, the block 302c and the connecting block 302a are moved to the second slot 301c. At this time, the connecting block 302a can drive the slide bar 202a and the force-bearing rod 202b to move. During this process, the force-bearing rod 202b will enter the fan-shaped slot 204b from the semicircular groove 204c. If the block 302c and the connecting block 302a are moved to the subsequent slot 301c, the slide bar 202a and the force-bearing rod 202b can be driven to move toward the large end of the fan-shaped slot 204b. When the block 302c and the connecting block 302a move to the required slot 301c, the block 302c is released, so that the tension spring 302d drives the block 302c to snap into the corresponding slot 301c, and the adjustment can be completed.

[0050] 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 preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A universal wind turbine tower assembly platform, characterized by: include, A main body component (100) comprises a moving component (101), and a rotating component (102) fixed to the top of the moving component (101), and also comprises a limiting component (103) fixed to the top of the rotating component (102), a ring piece can be placed on the top of the limiting component (103), and then the moving component (101) and the rotating component (102) can enable the ring piece to be moved and the angle to be adjusted; A calibration component (200), comprising a lever component (201) rotating on the rotating component (102), and a force-bearing component (202) sliding inside the lever component (201), and also comprising a connecting component (203) sliding on the force-bearing component (202), wherein the connecting component (203) and the rotating component (102) are connected, and also comprising a track component (204) fixed on the moving component (101), wherein the track component (204) and the force-bearing component (202) are adapted to each other, and pushing the lever component (201) can drive the force-bearing component (202) to squeeze the connecting component (203), so that the connecting component (203) can drive the rotating component (102) to move, and the moving angle of the force-bearing component (202) is limited by the track component (204); The adjusting component (300) comprises a slot plate component (301) fixed to the outer wall of the lever component (201), and a clamping component (302) sliding inside the slot plate component (301), wherein the clamping component (302) is connected to the force-bearing component (202), and the clamping component (302) adjusts the clamping position on the slot plate component (301), and the clamping component (302) can drive the force-bearing component (202) to be limited by the track component (204) at different angles.

2. The universal wind turbine tower assembly platform according to claim 1, characterized in that: The moving component (101) comprises a central disk (101a), and slide rails (101b) fixed to the four ends of the central disk (101a), and also comprises slide plates (101c) sliding on the top of the slide rails (101b) corresponding to the four ends of the central disk (101a).

3. The universal wind turbine tower assembly platform according to claim 2, characterized in that: The rotating assembly (102) comprises an arc-shaped bottom plate (102a) fixed to the top of the slide plate (101c), and an arc-shaped concave plate (102b) sliding on the top of the arc-shaped bottom plate (102a), wherein a groove (102c) is provided at the centre of the outer wall of the arc-shaped concave plate (102b).

4. The universal wind turbine tower assembly platform according to claim 3, characterized in that: The limiting assembly (103) comprises a support plate (103a) fixed to the top of the arc-shaped concave plate (102b), the top of the support plate (103a) is provided with a groove (103b), and the inner side of the top of the support plate (103a) is provided with a protruding end (103c).

5. The universal wind turbine tower assembly platform according to claim 1, characterized in that: The lever assembly (201) comprises a tilting rod (201a) rotating on the outside of the rotating assembly (102); a circular groove (201b) is provided on the inner wall of the tilting rod (201a); a through groove (201c) is provided on one end of the tilting rod (201a) located on the inside of the circular groove (201b); an adjustment groove (201d) is provided on one end of the tilting rod (201a) located on the outside of the circular groove (201b); and the circular groove (201b), the through groove (201c) and the adjustment groove (201d) are in communication with each other.

6. The universal wind turbine tower assembly platform according to claim 5, characterized in that: The force-bearing component (202) comprises a sliding rod (202a) sliding in the circular groove (201b), and a force-bearing rod (202b) fixed at the end of the sliding rod (202a) and located in the through groove (201c).

7. The universal wind turbine tower assembly platform according to claim 1, characterized in that: The connecting component (203) comprises a triangular plate (203a) fixed to the outer wall of the rotating component (102), and the triangular plate (203a) is provided with straight grooves (203b) at the upper and lower ends, and the straight grooves (203b) are adapted to the force-bearing component (202).

8. The universal wind turbine tower assembly platform according to claim 1, characterized in that: The track component (204) comprises a frame (204a) fixed on the moving component (101), the frame (204a) being provided with fan-shaped grooves (204b) at the upper and lower ends, and semicircular grooves (204c) being provided at the small sections of the fan-shaped grooves (204b) at the upper and lower ends of the frame (204a), and the semicircular grooves (204c) are adapted to the force-bearing component (202).

9. The universal wind turbine tower assembly platform according to claim 5, characterized in that: The slot plate assembly (301) comprises a slot plate (301a) fixed to an outer wall of the tilting rod (201a) at a location corresponding to the adjustment slot (201d); a connecting slot (301b) is provided inside the slot plate (301a) at a location corresponding to the adjustment slot (201d); the adjustment slot (201d) and the connecting slot (301b) are in communication; and a clamping slot (301c) is provided on the top of the slot plate (301a) at a location corresponding to the connection slot (301b).

10. The universal wind turbine tower assembly platform according to claim 1, characterized in that: The clamping assembly (302) comprises a connecting block (302a) fixed to one end of the outer side of the force-bearing assembly (202); a sunken groove (302b) is provided on the top of the connecting block (302a); and a clamping block (302c) sliding in the sunken groove (302b); and a tension spring (302d) fixed between the connecting block (302a) and the clamping block (302c); the clamping block (302c) is adapted to the slot plate assembly (301).

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