A hoisting device for building roadbed pipe pile launching

Abstract

The utility model discloses a kind of hoisting devices for building roadbed pipe pile throwing, it is related to building roadbed construction technology field, including the installation device for roadbed pipe pile throwing, the installation device includes base, multiple connecting seats, multiple first clamping blocks and multiple second clamping blocks, the surface of multiple connecting seats is all movably connected with the inside of base, multiple first clamping blocks and multiple second clamping blocks are all installed in the bottom of multiple connecting seats;The inside of base is provided with connecting assembly, the surface of connecting assembly is provided with clamping assembly.The utility model is cooperated by setting installation device, connecting assembly, clamping assembly and adjusting assembly, pipe pile is installed and connected by installation device, connecting assembly and clamping assembly make base and pipe pile fixed stable, the position of multiple connecting seats is adjusted by adjusting assembly, when pipe pile is hoisted, the problem that pipe pile is inconveniently connected and fixed is solved.

Description

Technical Field

[0001] This utility model relates to the field of building roadbed construction technology, specifically a lifting device for placing pipe piles in building roadbeds. Background Technology

[0002] Roadbed construction is a series of systematic operations carried out in road engineering to build a stable and durable foundation structure. Its core is to transform natural or treated foundations into an engineering entity that can withstand road structures and traffic loads through scientific methods.

[0003] During the construction of roadbeds, pipe piles need to be installed at the bottom of the roadbed. By transferring the upper load to the deep stable soil layer, the pipe piles significantly improve the bearing capacity of the foundation, control settlement deformation, and enhance the resistance to lateral displacement. When placing and installing the pipe piles, lifting equipment is required to lift and transport the pipe piles to the installation position. When using the lifting equipment to transport the pipe piles, the pipe piles need to be tied and fixed with steel wire ropes. Since steel wire ropes are relatively tough, the tying and installation process is cumbersome and it is not convenient to fix the pipe piles to the traction end of the lifting equipment. Utility Model Content

[0004] To address the problems mentioned in the background art, the purpose of this utility model is to provide a lifting device for placing pipe piles in roadbed construction, which has the advantage of facilitating the connection and fixation of the lifting equipment with the pipe piles, thus solving the problem of inconvenience in connecting and fixing the pipe piles when lifting them.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a lifting device for placing roadbed pipe piles, comprising an installation device for placing roadbed pipe piles, wherein the installation device comprises a base, multiple connecting seats, multiple first clamping blocks and multiple second clamping blocks, wherein the surfaces of the multiple connecting seats are movably connected to the interior of the base, and the multiple first clamping blocks and multiple second clamping blocks are installed on the bottom of the multiple connecting seats; The base is provided with a connecting component inside, and a clamping component is provided on the surface of the connecting component. The connecting component and the clamping component are used to drive multiple first clamping blocks and multiple second clamping blocks to move. An adjustment component is provided at the top inside the base, which is used to adjust the position of multiple connecting seats.

[0006] In a preferred embodiment of this utility model, the connecting assembly includes multiple connecting rods, multiple first gears, and multiple second gears. The surfaces of the multiple connecting rods are movably connected to the interior of the base, and the surfaces of the multiple connecting rods are movably connected to the interior of the multiple connecting seats. The side of the multiple connecting rods closest to the multiple first gears is fixedly connected to the surface of the multiple first gears, and the surface of the second gears is meshed with the surface of the multiple first gears.

[0007] In a preferred embodiment of this invention, the clamping assembly includes a plurality of bidirectional screws, a plurality of first clamping seats, and a plurality of second clamping seats. The surfaces of the plurality of bidirectional screws are movably connected to the interiors of the plurality of connecting seats, and the interiors of the plurality of bidirectional screws are slidably connected to the surfaces of the plurality of connecting rods. The surfaces of the plurality of first clamping seats are movably connected to the interiors of the plurality of connecting seats, and the interiors of the plurality of first clamping seats are threadedly connected to the surfaces of the plurality of bidirectional screws. The tops of the plurality of first clamping blocks are fixedly connected to the bottoms of the plurality of first clamping seats. The surfaces of the plurality of second clamping seats are movably connected to the interiors of the plurality of connecting seats, and the interiors of the plurality of second clamping seats are threadedly connected to the surfaces of the plurality of bidirectional screws. The tops of the plurality of second clamping blocks are fixedly connected to the bottoms of the plurality of second clamping seats.

[0008] In a preferred embodiment of this invention, the adjusting assembly includes a handle, an adjusting gear, multiple connecting gears, multiple adjusting screws, and multiple adjusting blocks. The surface of the handle is movably connected to the top of the interior of the base. The top of the adjusting gear is fixedly connected to the bottom of the handle. The surfaces of the multiple connecting gears are meshed with the surfaces of the adjusting gears. The sides of the multiple adjusting screws near the base are movably connected to the interior of the base. The surfaces of the multiple adjusting screws near the multiple connecting gears are fixedly connected to the surfaces of the multiple connecting gears. The tops of the multiple adjusting blocks are movably connected to the top of the interior of the base. The bottoms of the multiple adjusting blocks are fixedly connected to the tops of the multiple connecting seats. The interiors of the multiple adjusting blocks are meshed with the surfaces of the multiple adjusting screws.

[0009] In a preferred embodiment of this utility model, a fixed seat is fixedly connected to the bottom of the base, a limiting rod is fixedly connected to the top of the fixed seat, the interior of the second gear is movably connected to the surface of the limiting rod, two limiting seats are fixedly connected to the surface of the limiting rod, multiple limiting blocks are fixedly connected to the surface of each of the two limiting seats, the surfaces of the multiple limiting blocks at the bottom are movably connected to the interior of multiple first gears, and the surfaces of the multiple limiting blocks at the top are movably connected to the interior of multiple connecting gears.

[0010] As a preferred embodiment of this utility model, the surface of the fixing base is fixedly connected with a plurality of support rods, and the interiors of the plurality of first clamping blocks and the plurality of second clamping blocks are slidably connected to the surface of the plurality of support rods.

[0011] As a preferred embodiment of this utility model, a protrusion is fixedly connected to the top of the limiting seat, and the surface of the protrusion is movably connected to the inside of the adjusting gear.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model solves the problem of inconvenience in connecting and fixing pipe piles when lifting them by using an installation device, a connecting component, a clamping component, and an adjusting component. The installation device is used to install and connect the pipe piles, the connecting component and the clamping component are used to fix the base to the pipe piles stably, and the adjusting component is used to adjust the position of multiple connecting seats. This achieves the effect of facilitating the connection and fixing of lifting equipment to pipe piles.

[0013] 2. This utility model, by setting up a connecting component and a clamping component, allows multiple connecting rods to rotate simultaneously via multiple first gears and second gears, and multiple bidirectional screws to rotate multiple connecting rods simultaneously, thereby driving multiple first clamping seats and multiple second clamping seats to move, thereby driving multiple first clamping blocks and multiple second clamping blocks to clamp and fix the pipe pile.

[0014] 3. By setting an adjustment component, the adjustment gear can drive multiple adjustment screws to rotate through multiple connecting gears, and the multiple adjustment screws can drive multiple connecting seats to move through multiple adjustment blocks, thereby enabling the installation of pipe piles of different sizes. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the base; Figure 3 This is a schematic diagram of the clamping assembly. Figure 4 This is a schematic diagram of the adjustment component.

[0016] In the diagram: 1. Mounting device; 101. Base; 102. Connecting seat; 103. First clamping block; 104. Second clamping block; 2. Connecting assembly; 201. Connecting rod; 202. First gear; 203. Second gear; 3. Clamping assembly; 301. Bidirectional screw; 302. First clamping seat; 303. Second clamping seat; 4. Adjusting assembly; 401. Rotary handle; 402. Adjusting gear; 403. Connecting gear; 404. Adjusting screw; 405. Adjusting block; 5. Fixed seat; 6. Limiting rod; 7. Limiting seat; 8. Limiting block; 9. Support rod; 10. Protrusion. Detailed Implementation

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0018] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0019] Secondly, the term "an 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 phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that excludes other embodiments.

[0020] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.

[0021] Example 1 Reference Figure 1-4 This is the first embodiment of the present utility model, which provides an installation device 1 for placing roadbed pipe piles. The installation device 1 includes a base 101, a plurality of connecting seats 102, a plurality of first clamping blocks 103 and a plurality of second clamping blocks 104. The surfaces of the plurality of connecting seats 102 are movably connected to the interior of the base 101. The plurality of first clamping blocks 103 and the plurality of second clamping blocks 104 are all installed on the bottom of the plurality of connecting seats 102. The base 101 has a connecting component 2 inside, and a clamping component 3 is provided on the surface of the connecting component 2. The connecting component 2 and the clamping component 3 are used to drive multiple first clamping blocks 103 and multiple second clamping blocks 104 to move. An adjustment component 4 is provided at the top inside the base 101. The adjustment component 4 is used to adjust the position of multiple connectors 102.

[0022] Specifically, the pipe pile is installed and connected by the installation device 1, the base 101 is fixed and stabilized to the pipe pile by the connecting component 2 and the clamping component 3, the position of multiple connecting seats 102 is adjusted by the adjusting component 4, and the top of the base 101 is connected to the traction end of the lifting equipment.

[0023] Furthermore, during the installation of the pipe pile, the positions of multiple connecting seats 102 are adjusted by adjusting component 4 so that the center distance between the two opposite connecting seats 102 is equal to the middle diameter of the pipe pile. The bottom of the base 101 is then attached to one end of the pipe pile. Multiple first clamping blocks 103 are located on the outside of the pipe pile, and multiple second clamping blocks 104 are located inside the pipe pile. The clamping component 3 is driven by connecting component 2, and the clamping component 3 moves multiple first clamping blocks 103 and multiple second clamping blocks 104. The pipe pile is clamped and fixed by multiple first clamping blocks 103 and multiple second clamping blocks 104, so that the base 101 and the pipe pile are fixed and stable.

[0024] Example 2 In the second embodiment of this utility model, a connecting assembly 2 includes multiple connecting rods 201, multiple first gears 202, and multiple second gears 203. The surfaces of the multiple connecting rods 201 are movably connected to the interior of the base 101, and the surfaces of the multiple connecting rods 201 are movably connected to the interior of the multiple connecting seats 102. The side of each connecting rod 201 near the multiple first gears 202 is fixedly connected to the surface of the multiple first gears 202. The surfaces of the second gears 203 are meshed with the surfaces of the multiple first gears 202. A clamping assembly 3 includes multiple bidirectional screws 301, multiple first clamping seats 302, and multiple second clamping seats 303. The surfaces of the multiple bidirectional screws 301 are meshed with the surfaces of the multiple connecting seats. The internal movable connection of 102 includes multiple bidirectional screws 301 that are slidably connected to the surfaces of multiple connecting rods 201, multiple first clamping seats 302 that are movably connected to the interior of multiple connecting seats 102, multiple first clamping seats 302 that are threadedly connected to the surfaces of multiple bidirectional screws 301, multiple first clamping blocks 103 that are fixedly connected to the bottom of multiple first clamping seats 302, multiple second clamping seats 303 that are movably connected to the interior of multiple connecting seats 102, multiple second clamping seats 303 that are threadedly connected to the surfaces of multiple bidirectional screws 301, and multiple second clamping blocks 104 that are fixedly connected to the bottom of multiple second clamping seats 303.

[0025] Specifically, by rotating the connecting rod 201, multiple connecting rods 201 can rotate simultaneously via multiple first gears 202 and second gears 203. Multiple bidirectional screws 301 rotate multiple connecting rods 201 simultaneously, thereby driving multiple first clamping seats 302 and multiple second clamping seats 303 to move, thereby driving multiple first clamping blocks 103 and multiple second clamping blocks 104 to clamp and fix the pipe pile.

[0026] Furthermore, the rotating connecting rod 201 drives the second gear 203 to rotate via the first gear 202 during rotation. During the rotation of the second gear 203, multiple first gears 202 drive multiple connecting rods 201 to rotate simultaneously. During the simultaneous rotation of multiple connecting rods 201, multiple bidirectional screws 301 rotate simultaneously. During the rotation of multiple bidirectional screws 301, multiple first clamping seats 302 and multiple second clamping seats 303 move. Multiple first clamping blocks 103 and multiple second clamping blocks 104 move closer to the pipe pile and clamp and fix the pipe pile.

[0027] Example 3 The third embodiment of this utility model provides an adjusting assembly 4 including a handle 401, an adjusting gear 402, multiple connecting gears 403, multiple adjusting screws 404, and multiple adjusting blocks 405. The surface of the handle 401 is movably connected to the top of the interior of the base 101. The top of the adjusting gear 402 is fixedly connected to the bottom of the handle 401. The surfaces of the multiple connecting gears 403 are all meshed with the surfaces of the adjusting gears 402. The sides of the multiple adjusting screws 404 near the base 101 are movably connected to the interior of the base 101. The surfaces of the multiple adjusting screws 404 near the multiple connecting gears 403 are fixedly connected to the surfaces of the multiple connecting gears 403. The tops of the multiple adjusting blocks 405 are movably connected to the top of the interior of the base 101, and the bottoms of the multiple adjusting blocks 405 are fixedly connected to the tops of the multiple connecting seats 102. The internal components are all meshed with the surfaces of multiple adjusting screws 404. A fixed seat 5 is fixedly connected to the bottom of the base 101. A limit rod 6 is fixedly connected to the top of the fixed seat 5. The internal components of the second gear 203 are movably connected to the surface of the limit rod 6. Two limit seats 7 are fixedly connected to the surface of the limit rod 6. Multiple limit blocks 8 are fixedly connected to the surfaces of the two limit seats 7. The surfaces of the multiple limit blocks 8 at the bottom are movably connected to the internal components of multiple first gears 202. The surfaces of the multiple limit blocks 8 at the top are movably connected to the internal components of multiple connecting gears 403. Multiple support rods 9 are fixedly connected to the surface of the fixed seat 5. The internal components of multiple first clamping blocks 103 and multiple second clamping blocks 104 are slidably connected to the surfaces of multiple support rods 9. A protrusion 10 is fixedly connected to the top of the top limit seat 7. The surface of the protrusion 10 is movably connected to the internal components of the adjusting gear 402.

[0028] Specifically, the adjusting gear 402 can drive multiple adjusting screws 404 to rotate through multiple connecting gears 403. The multiple adjusting screws 404 can drive multiple connecting seats 102 to move through multiple adjusting blocks 405, thereby enabling the installation of pipe piles of different sizes. The position of multiple first gears 202 and multiple connecting gears 403 can be restricted by the limiting block 8. The movement direction of multiple first clamping blocks 103 and multiple second clamping blocks 104 can be restricted by the support rod 9. The position of the adjusting gear 402 can be restricted by the protrusion 10.

[0029] Furthermore, rotating the handle 401 causes the adjusting gear 402 to rotate. During the rotation of the adjusting gear 402, multiple connecting gears 403 rotate. During the rotation of the multiple connecting gears 403, multiple adjusting screws 404 rotate. During the rotation of the multiple adjusting screws 404, multiple connecting seats 102 move through multiple adjusting blocks 405.

[0030] Working principle: During the installation of the pipe pile, rotating the handle 401 causes the adjusting gear 402 to rotate. The rotation of the adjusting gear 402 then drives multiple connecting gears 403 to rotate, which in turn drives multiple adjusting screws 404 to rotate. The rotation of the adjusting screws 404, through multiple adjusting blocks 405, moves multiple connecting seats 102, aligning the center distance between the two opposite connecting seats 102 with the pipe pile's mid-diameter. This brings the bottom of the base 101 into contact with one end of the pipe pile. Multiple first clamping blocks 103 are located on the outside of the pipe pile, and multiple second clamping blocks 104... Located inside the pipe pile, the rotating connecting rod 201 drives the second gear 203 to rotate via the first gear 202 during rotation. During the rotation of the second gear 203, multiple first gears 202 drive multiple connecting rods 201 to rotate simultaneously. During the simultaneous rotation of multiple connecting rods 201, multiple bidirectional screws 301 rotate simultaneously. During the rotation of multiple bidirectional screws 301, multiple first clamping seats 302 and multiple second clamping seats 303 move. Multiple first clamping blocks 103 and multiple second clamping blocks 104 move closer to the pipe pile and clamp and fix the pipe pile.

[0031] In summary, the combination of the installation device, connecting components, clamping components, and adjusting components achieves the effect of facilitating the connection and fixation of the lifting equipment to the pipe pile.

[0032] The bidirectional screw and adjusting screw used in this application can be additionally equipped with protective measures that are common knowledge in this technical field under different usage environments, including but not limited to the following methods, such as protective covers for equipment protection, dustproof nets for equipment dust prevention, and sealing components or waterproof coatings for equipment waterproofing, which are commonly used by those skilled in the art.

[0033] It should be noted that (screws, gears) are existing devices or equipment, or devices or equipment that can be implemented by existing technology. The power supply, connection method, usage method, power source, fixing method, installation method, control method, etc. of the equipment, as well as the materials of each accessory and the selection of various parameters are all common knowledge in the art, and therefore will not be described in detail in this application document.

[0034] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of this utility model. The order or sequence of any process or method steps may be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structural equivalents but also equivalent structures. Without departing from the scope of this invention, other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments. Therefore, this invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0035] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the present invention as currently considered, or those features that are not relevant to implementing the present invention) may be omitted.

[0036] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A lifting device for placing pipe piles in a building roadbed, characterized in that: The installation device (1) includes a base (101), a plurality of connecting seats (102), a plurality of first clamping blocks (103) and a plurality of second clamping blocks (104). The surfaces of the plurality of connecting seats (102) are movably connected to the interior of the base (101). The plurality of first clamping blocks (103) and the plurality of second clamping blocks (104) are installed on the bottom of the plurality of connecting seats (102). The base (101) is provided with a connecting component (2) inside, and a clamping component (3) is provided on the surface of the connecting component (2). The connecting component (2) and the clamping component (3) are used to drive multiple first clamping blocks (103) and multiple second clamping blocks (104) to move. An adjustment component (4) is provided at the top inside the base (101), which is used to adjust the position of multiple connecting seats (102).

2. The lifting device for placing pipe piles in a building roadbed according to claim 1, characterized in that: The connecting assembly (2) includes multiple connecting rods (201), multiple first gears (202), and a second gear (203). The surfaces of the multiple connecting rods (201) are movably connected to the interior of the base (101), and the surfaces of the multiple connecting rods (201) are movably connected to the interior of the multiple connecting seats (102). The side of the multiple connecting rods (201) closest to the multiple first gears (202) is fixedly connected to the surface of the multiple first gears (202), and the surface of the second gear (203) is meshed with the surface of the multiple first gears (202).

3. The lifting device for placing pipe piles in a building subgrade according to claim 2, characterized in that: The clamping assembly (3) includes multiple bidirectional screws (301), multiple first clamping seats (302), and multiple second clamping seats (303). The surfaces of the multiple bidirectional screws (301) are movably connected to the interiors of multiple connecting seats (102), and the interiors of the multiple bidirectional screws (301) are slidably connected to the surfaces of multiple connecting rods (201). The surfaces of the multiple first clamping seats (302) are movably connected to the interiors of the multiple connecting seats (102), and the interiors of the multiple first clamping seats (302) are slidably connected to the surfaces of multiple connecting rods (201). Each part is threadedly connected to the surface of multiple bidirectional screws (301), the top of each of the multiple first clamping blocks (103) is fixedly connected to the bottom of multiple first clamping seats (302), the surface of each of the multiple second clamping seats (303) is movably connected to the interior of multiple connecting seats (102), the interior of each of the multiple second clamping seats (303) is threadedly connected to the surface of multiple bidirectional screws (301), and the top of each of the multiple second clamping blocks (104) is fixedly connected to the bottom of multiple second clamping seats (303).

4. The lifting device for placing pipe piles in a building subgrade according to claim 3, characterized in that: The adjusting assembly (4) includes a handle (401), an adjusting gear (402), multiple connecting gears (403), multiple adjusting screws (404), and multiple adjusting blocks (405). The surface of the handle (401) is movably connected to the top of the base (101). The top of the adjusting gear (402) is fixedly connected to the bottom of the handle (401). The surfaces of the multiple connecting gears (403) are meshed with the surfaces of the adjusting gears (402). The multiple adjusting screws (404) are close to the base (101). One side of each of the multiple adjustment screws (404) is movably connected to the interior of the base (101). The surfaces of the multiple adjustment screws (404) near the multiple connecting gears (403) are fixedly connected to the surfaces of the multiple connecting gears (403). The tops of the multiple adjustment blocks (405) are movably connected to the top of the interior of the base (101). The bottoms of the multiple adjustment blocks (405) are fixedly connected to the tops of the multiple connecting seats (102). The interiors of the multiple adjustment blocks (405) are meshed with the surfaces of the multiple adjustment screws (404).

5. A lifting device for placing pipe piles in a building roadbed according to claim 4, characterized in that: The bottom of the base (101) is fixedly connected to a fixed seat (5), and the top of the fixed seat (5) is fixedly connected to a limiting rod (6). The interior of the second gear (203) is movably connected to the surface of the limiting rod (6). The surface of the limiting rod (6) is fixedly connected to two limiting seats (7). The surfaces of the two limiting seats (7) are fixedly connected to multiple limiting blocks (8). The surfaces of the multiple limiting blocks (8) at the bottom are movably connected to the interior of multiple first gears (202), and the surfaces of the multiple limiting blocks (8) at the top are movably connected to the interior of multiple connecting gears (403).

6. The lifting device for placing pipe piles in a building roadbed according to claim 5, characterized in that: The surface of the fixed base (5) is fixedly connected with a plurality of support rods (9), and the interiors of the plurality of first clamping blocks (103) and the plurality of second clamping blocks (104) are slidably connected to the surface of the plurality of support rods (9).

7. A lifting device for placing pipe piles in a building subgrade according to claim 5, characterized in that: The top of the limiting seat (7) is fixedly connected to a protrusion (10), and the surface of the protrusion (10) is movably connected to the inside of the adjusting gear (402).

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