A geotechnical engineering foundation pit protection device

Abstract

The utility model discloses a geotechnical engineering foundation pit protection device, which mainly includes a first protection component, a second protection component and a fixing component. The first protection component includes a first base, a first protection mesh plate connected to the first base, a pair of universal wheels fixed to the bottom of the first base, a first plug rod fixed to one side of the first base, and a first fixing structure for fixing the first protection mesh plate to the first base together. The second protection component includes a second base, a second protection mesh plate connected to the second base, and a second fixing structure for fixing the second protection mesh plate to the second base together. The front and rear ends of the second base are both provided with an interlocking groove. The first plug rod is fixed by bolts after being adapted and plugged into the interlocking groove. The fixing component is provided with two groups for fixing the device. The utility model is simple to operate and is conducive to the rapid transportation of the device. At the same time, it makes the assembly process of the device rapid and efficient, which brings great convenience to users.

Description

Technical Field

[0001] The utility model relates to the technical field of geotechnical engineering, in particular to a geotechnical engineering foundation pit protection device. Background Art

[0002] Geotechnical engineering is a new technical system established in the practice of civil engineering in Europe and the United States in the 1960s. The part of civil engineering involving rock, soil, underground and water is called geotechnical engineering. In geotechnical engineering, it is necessary to protect the foundation pit. The foundation pit is a temporary project. Its function is to provide a space so that the foundation masonry work can be carried out according to the position specified in the design.

[0003] In the existing foundation pit protection device, the protective mesh plate and the base are generally fixed and assembled with bolts. When disassembling or assembling, the bolts need to be loosened or tightened manually one by one. This design makes the disassembly and assembly process cumbersome and is not conducive to the rapid transportation of the device. In addition, the existing foundation pit protection device lacks a mobile function, which makes it inconvenient to move the device to the place of use and has poor convenience of use. Utility Model Content

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

[0005] To solve the above technical problems, the utility model provides the following technical solutions: a geotechnical engineering foundation pit protection device, mainly comprising a first protection component, a second protection component and a fixing component, the first protection component is provided in a pair and is symmetrically arranged front and back, the first protection component comprises a first base, a first protection mesh plate connected to the first base, a pair of universal wheels fixedly connected to the bottom of the first base, a first plug rod fixedly connected to one side of the first base, and a first fixing structure for fixing the first protection mesh plate to the first base together, the second protection component is provided in a pair and is symmetrically arranged between a pair of first protection components, the second protection component comprises a second base, a second protection mesh plate connected to the second base, and a second fixing structure for fixing the second protection mesh plate to the second base together, the front and rear ends of the second base are both provided with an embedding groove, the first plug rod is fixed by bolts after being adapted and plugged into the embedding groove, the fixing component is provided in two groups, and is respectively fixedly connected to one side of a pair of first bases away from each other, for fixing the device.

[0006] As a preferred solution of the geotechnical engineering foundation pit protection device described in the utility model, wherein: the first protective mesh plate includes a first protective mesh plate body and a first positioning plate fixedly connected to the bottom of the first protective mesh plate body, the first positioning plate is provided with first slots interconnected on the front and rear sides, and the first positioning plate is connected to the first base.

[0007] As a preferred solution of the geotechnical engineering foundation pit protection device described in the utility model, wherein: a first positioning groove is opened on the top of the first base, the first positioning plate is adapted to be plugged into the first positioning groove, second slots that are interconnected are opened at the front and rear sides of the first base corresponding to the first slot, and a first fixed structure is connected to the first base, the first slot, and the second slot.

[0008] As a preferred scheme of the geotechnical engineering foundation pit protection device described in the utility model, the first fixing structure includes: the first limiting plug plate adapted to be plugged into the first slot and the second slot, the first cross bar fixedly connected to the side of the first limiting plug plate away from the second protection component, and a pair of first fixing sleeves fixedly connected to the side of the first base away from the second protection component, the left and right ends of the first cross bar are provided with grooves, the bottom walls of the grooves are fixedly connected with the first springs, a pair of first plug-in rods are fixedly connected at one end of the first springs away from each other, a pair of first plug-in rods slide out of the groove at one end away from the first spring and are respectively adapted to be plugged into the pair of first fixing sleeves, a pair of first moving grooves connected to the grooves are provided on the side of the first cross bar away from the first base, a pair of first moving rods are slidably penetrated in the first moving grooves, and the inner ends of the pair of first moving rods are respectively fixedly connected to the first plug-in rods.

[0009] As a preferred solution of the geotechnical engineering foundation pit protection device described in the utility model, the second protective mesh plate includes a second protective mesh plate body and a second positioning plate fixedly connected to the bottom of the second protective mesh plate body, and the second positioning plate is provided with third slots interconnected on the left and right sides, and the second positioning plate is connected to the second base.

[0010] As a preferred solution of the geotechnical engineering foundation pit protection device described in the utility model, wherein: a second positioning groove is opened on the top of the second base, the second positioning plate is adapted to be plugged into the second positioning groove, fourth slots that are interconnected are opened on the left and right sides of the second base corresponding to the second positioning groove, and the second fixed structure is connected to the second base, the third slot, and the fourth slot.

[0011] As a preferred scheme of the geotechnical engineering foundation pit protection device described in the utility model, wherein: the second fixed structure is the same as the first fixed structure, the second fixed structure includes a second limit plug plate adapted to be plugged in and out of the third slot and the fourth slot, a second cross bar fixedly connected to the outer side of the second limit plug plate, and a pair of second fixed sleeves fixedly connected to the outer side of the second base, the front and rear ends of the second cross bar are provided with grooves, the inner bottom walls of the grooves are fixedly connected with second springs, a pair of second springs are fixedly connected with one end thereof away from each other, a pair of second plug rods are slid out of the groove at one end away from the second spring and are respectively adapted to be plugged in and out of the pair of second fixed sleeves, a pair of second moving grooves connected with the grooves are provided on the side of the second cross bar away from the second base, a pair of second moving rods are slidably penetrated in the second moving grooves, and the inner ends of the pair of second moving rods are respectively fixedly connected with a pair of second plug rods.

[0012] As a preferred solution of the geotechnical engineering foundation pit protection device described in the utility model, wherein: the fixed component includes a mounting plate fixedly connected to the first base, an internal threaded tube is fixedly passed through the mounting plate, a screw is spirally passed through the internal threaded tube, a rotating knob is fixedly connected to the top end of the screw, and a positioning cone is fixedly connected to the bottom end of the screw.

[0013] Beneficial effects of the utility model:

[0014] 1. In the utility model, the first protective mesh plate and the first base, as well as the second protective mesh plate and the second base are fixedly connected together by a first fixing structure and a second fixing structure respectively. The first fixing structure and the second fixing structure have the same structure, and both achieve stable fixation of the protective mesh plates by snapping and rebounding. This design is not only simple and convenient to operate, but also greatly improves the efficiency of disassembly and assembly, and is also conducive to the rapid transportation of the device. At the same time, it makes the assembly process of the device quick and efficient, bringing great convenience to users.

[0015] 2. The utility model installs universal wheels at the bottom of the first base, which makes it easy to push the device to the place of use, and is easy to use. In addition, through the coordinated use of screws, rotating buttons, positioning cones, etc., the device can be fixed to improve the stability of the device and better protect the foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following briefly introduces the drawings required for the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] Figure 2 It is a structural schematic diagram of the first protection component of the utility model.

[0019] Figure 3 It is a structural schematic diagram of the first base of the utility model.

[0020] Figure 4 It is a structural schematic diagram of the first protective mesh plate of the utility model.

[0021] Figure 5 It is a structural schematic diagram of the first fixing structure of the utility model.

[0022] Figure 6 It is a structural schematic diagram of the second protection component of the utility model.

[0023] Figure 7 It is a structural schematic diagram of the second base of the utility model.

[0024] Figure 8 It is a structural schematic diagram of the second protective mesh plate of the utility model.

[0025] Fig. 9 It is a structural schematic diagram of the second fixing structure of the utility model.

[0026] Fig.10 It is a structural schematic diagram of the fixing component of the utility model.

[0027] In the figure: 100, first protection component; 101, first base; 102, first protection mesh; 102-1, first protection mesh body; 102-2, first positioning plate; 102-3, first slot; 103, universal wheel; 104, first plug rod; 105, first fixing structure; 105-1, first limit plug plate; 105-2, first cross bar; 105-3, first fixing sleeve; 105-4, first spring; 105-5, first plug rod; 105-6, first moving rod; 105-7, first moving slot; 106, first positioning slot; 107, second slot; 200, second protection component; 201, second base Seat; 202, second protective mesh; 202-1, second protective mesh body; 202-2, second positioning plate; 202-3, third slot; 203, second fixed structure; 203-1, second limit plug plate; 203-2, second cross bar; 203-3, second fixed sleeve; 203-4, second spring; 203-5, second plug rod; 203-6, second moving rod; 203-7, second moving slot; 204, fitting slot; 205, second positioning slot; 206, fourth slot; 300, fixed assembly; 301, mounting plate; 302, internal threaded tube; 303, screw; 304, rotating button; 305, positioning cone. DETAILED DESCRIPTION

[0028] In order to make the above-mentioned purposes, 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.

[0029] 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.

[0030] 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.

[0031] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0032] Reference Figure 1-10 The utility model provides a geotechnical engineering foundation pit protection device, which mainly includes:

[0033] The first protection component 100, such as Figure 1-2 The first protection assembly 100 is provided with a pair of symmetrical front and rear arrangements, and the first protection assembly 100 includes a first base 101, a first protection mesh plate 102 connected to the first base 101, a pair of universal wheels 103 fixedly connected to the bottom of the first base 101, a first plug rod 104 fixedly connected to one side of the first base 101, and a first fixing structure 105 for fixing the first protection mesh plate 102 to the first base 101 together, wherein the universal wheels 103 are provided to facilitate pushing the device to a designated location, so that people can use it easily;

[0034] The second protection component 200, such as Figure 1 and Figure 6 A pair of second protective components 200 are provided, and are symmetrically arranged between a pair of first protective components 100. A rectangular frame structure is formed between the pair of second protective components 200 and the pair of first protective components 100. The second protective component 200 includes a second base 201, a second protective mesh plate 202 connected to the second base 201, and a second fixing structure 203 for fixing the second protective mesh plate 202 to the second base 201. The second base 201 is provided with an engaging groove 204 at the front and rear ends. The first plug rod 104 is fixed by bolts after being adapted and plugged into the engaging groove 204.

[0035] The fixing assembly 300, such as Figure 1 There are two sets of fixing components 300, which are respectively fixedly connected to the sides of a pair of first bases 101 away from each other, so as to fix the device.

[0036] Specifically, Figure 3-4 The first protective mesh plate 102 includes a first protective mesh plate body 102-1 and a first positioning plate 102-2 fixedly connected to the bottom of the first protective mesh plate body 102-1. The first positioning plate 102-2 has first slots 102-3 connected to each other on the front and rear sides. The first positioning plate 102-2 is connected to the first base 101.

[0037] A first positioning groove 106 is provided on the top of the first base 101, and the first positioning plate 102-2 is adapted to be plugged into the first positioning groove 106. Second slots 107 that are interconnected are provided at the front and rear sides of the first base 101 corresponding to the first slot 102-3. The first fixing structure 105 is connected to the first base 101, the first slot 102-3, and the second slot 107.

[0038] Furthermore, Figure 5The first fixed structure 105 includes a first limiting plug plate 105-1 adapted to be plugged into the first slot 102-3 and the second slot 107, a first cross bar 105-2 fixedly connected to the side of the first limiting plug plate 105-1 away from the second protective component 200, and a pair of first fixing sleeves 105-3 fixedly connected to the side of the first base 101 away from the second protective component 200, the left and right ends of the first cross bar 105-2 are provided with grooves, the bottom walls of the grooves are fixedly connected to first springs 105-4, and the ends of the pair of first springs 105-4 away from each other are fixedly connected The first plug-in rod 105-5, one end of a pair of first plug-in rods 105-5 away from the first spring 105-4 slides out of the groove and is respectively adapted to be plugged in with a pair of first fixing sleeves 105-3. Through the plug-in action of the first plug-in rod 105-5 and the first fixing sleeve 105-3, the first cross bar 105-2 can be fixed, thereby ensuring the limiting effect of the first limiting plug plate 105-1 on the first positioning plate 102-2. The overall operation is simple, and the device is easy to assemble. The stability of the first protective mesh plate 102 can be ensured through the combined action of snap-fit ​​and elastic rebound.

[0039] A pair of first movable grooves 105-7 connected with the groove are opened on the side of the first cross bar 105-2 away from the first base 101, and the first movable rods 105-6 are slidably penetrated in the pair of first movable grooves 105-7. The inner ends of the pair of first movable rods 105-6 are respectively fixedly connected to the first plug-in rods 105-5. By setting the first movable rods 105-6, it is convenient to drive the first plug-in rods 105-5 to retreat, thereby facilitating the release of the limit of the first positioning plate 102-2 and improving the disassembly efficiency.

[0040] Specifically, Figure 7-8 The second protective mesh plate 202 includes a second protective mesh plate body 202-1 and a second positioning plate 202-2 fixedly connected to the bottom of the second protective mesh plate body 202-1. The second positioning plate 202-2 has third slots 202-3 on both sides thereof that are interconnected. The second positioning plate 202-2 is connected to the second base 201.

[0041] A second positioning groove 205 is provided on the top of the second base 201, and the second positioning plate 202-2 is adapted to be plugged into the second positioning groove 205. Fourth slots 206 that are interconnected are provided on the left and right sides of the second base 201 corresponding to the second positioning groove 205. The second fixing structure 203 is connected to the second base 201, the third slot 202-3, and the fourth slot 206.

[0042] Furthermore, Fig. 9The second fixing structure 203 has the same structure as the first fixing structure 105, so that the second fixing structure 203 and the first fixing structure 105 can be used interchangeably. The second fixing structure 203 includes a second limiting plug plate 203-1 adapted to be plugged in the third slot 202-3 and the fourth slot 206, a second cross bar 203-2 fixedly connected to the outer side of the second limiting plug plate 203-1, and a pair of second fixing sleeves 203-3 fixedly connected to the outer side of the second base 201. The second cross bar 203-2 is provided with grooves at both ends, and the bottom wall of the groove is fixedly connected to a second spring 203-4. The pair of second springs 203 -4 are fixedly connected to each other at one end of a pair of second plug rods 203-5, one end of a pair of second plug rods 203-5 away from the second spring 203-4 slides out of the groove and is respectively adapted to be plugged with a pair of second fixing sleeves 203-3, and the second cross bar 203-2 can be fixed by the plugging action of the second plug rods 203-5 and the second fixing sleeves 203-3, thereby ensuring the limiting effect of the second limiting plug plate 203-1 on the second positioning plate 202-2, and the overall operation is simple, and the device is easy to assemble, and the stability of the second protective mesh plate 202 can be ensured by the joint action of the snap-fit ​​and the elastic rebound;

[0043] A pair of second movable grooves 203-7 connected to the groove are opened on the side of the second cross bar 203-2 away from the second base 201, and the second movable rods 203-6 are slidably penetrated in the pair of second movable grooves 203-7. The inner ends of the pair of second movable rods 203-6 are respectively fixedly connected to a pair of second plug-in rods 203-5. By setting the second movable rods 203-6, it is convenient to drive the second plug-in rods 203-5 to retreat, thereby facilitating the release of the limit of the second positioning plate 202-2, thereby improving the disassembly efficiency.

[0044] Specifically, Fig.10 The fixing assembly 300 includes a mounting plate 301 fixedly connected to the first base 101, an internal threaded tube 302 is fixedly passed through the mounting plate 301, a screw 303 is spirally passed through the internal threaded tube 302, a rotating button 304 is fixedly connected to the top of the screw 303, and a positioning cone 305 is fixedly connected to the bottom of the screw 303. When the device needs to be fixed, the screw 303 is driven to rotate by the rotating button 304, and the screw 303 moves downward along the internal threaded tube 302 spirally, and the screw 303 drives the positioning cone 305 to move downward synchronously, so that the positioning cone 305 is inserted into the soil, so that the device can be fixed, and the stability and protection effect of the device are improved.

[0045] In summary, when the device needs to be transported, the first protective mesh plate 102 and the second protective mesh plate 202 need to be disassembled, and the specific operation is: first, a pair of first moving rods 105-6 are used to simultaneously drive a pair of first plug-in rods 105-5 to retreat, and after the first plug-in rod 105-5 is separated from the first fixed sleeve 105-3, the first cross bar 105-2 is pulled, and the first cross bar 105-2 drives the first limiting plug plate 105-1 to move, and the first limiting plug plate 105-1 is pulled out from the first slot 102-3 and the second slot 107. After being pulled out, the first fixing structure 105 is placed aside, and then the first protective mesh plate 102 is moved upward, so that the first positioning plate 102-2 at the bottom is separated from the first positioning groove 106 on the first base 101, and the disassembly of the first protective mesh plate 102 is completed; then After that, a pair of second moving rods 203-6 simultaneously drive a pair of second plug-in rods 203-5 to retreat, and the second plug-in rod 203-5 is separated from the second fixed sleeve 203-3. After separation, the second cross bar 203-2 is pulled, and the second cross bar 203-2 drives the second limiting plug plate 203-1 to be pulled out from the third slot 202-3 and the fourth slot 206. After pulling out, the second fixed structure 203 is placed aside, and then the second protective mesh plate 202 is moved upward to separate the second positioning plate 202-2 at the bottom from the second positioning groove 205 on the second base 201, and the disassembly of the second protective mesh plate 202 is completed. The overall operation is simple, which greatly improves the efficiency of disassembly and assembly, and is also conducive to the rapid transportation of the device. At the same time, it makes the assembly process of the device quick and efficient, which brings great convenience to users.

[0046] It should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A geotechnical engineering foundation pit protection device, characterized in that: include: A first protection component (100), wherein the first protection component (100) is provided in a pair and is symmetrically arranged front to back, the first protection component (100) comprising a first base (101), a first protection mesh plate (102) connected to the first base (101), a pair of universal wheels (103) fixedly connected to the bottom of the first base (101), a first insertion rod (104) fixedly connected to one side of the first base (101), and a first fixing structure (105) for fixing the first protection mesh plate (102) and the first base (101) together; A second protection component (200), wherein the second protection component (200) is provided in pair and is symmetrically arranged between a pair of first protection components (100), the second protection component (200) comprising a second base (201), a second protection mesh plate (202) connected to the second base (201), and a second fixing structure (203) for fixing the second protection mesh plate (202) and the second base (201) together, the second base (201) is provided with an engaging groove (204) at the front and rear ends, and the first insertion rod (104) is fixed by bolts after being adapted and plugged into the engaging groove (204); A fixing assembly (300), wherein two groups of the fixing assembly (300) are provided and are respectively fixedly connected to one side of a pair of first bases (101) that are away from each other, and are used to fix the device.

2. The geotechnical engineering foundation pit protection device according to claim 1, characterized in that: The first protective mesh plate (102) comprises a first protective mesh plate body (102-1) and a first positioning plate (102-2) fixedly connected to the bottom of the first protective mesh plate body (102-1), the first positioning plate (102-2) is provided with first slots (102-3) interconnected with each other on the front and rear sides, and the first positioning plate (102-2) is connected to the first base (101).

3. The geotechnical engineering foundation pit protection device according to claim 2, characterized in that: A first positioning slot (106) is provided on the top of the first base (101); the first positioning plate (102-2) is adapted to be plugged into the first positioning slot (106); second slots (107) that are interconnected are provided at the front and rear sides of the first base (101) corresponding to the first slot (102-3); and a first fixing structure (105) is connected to the first base (101), the first slot (102-3), and the second slot (107).

4. The geotechnical engineering foundation pit protection device according to claim 1, characterized in that: The first fixing structure (105) comprises a first limit plug plate (105-1) adapted to be plugged into the first slot (102-3) and the second slot (107), a first cross bar (105-2) fixedly connected to a side of the first limit plug plate (105-1) away from the second protection component (200), and a pair of first fixing sleeves (105-3) fixedly connected to a side of the first base (101) away from the second protection component (200), the first cross bar (105-2) having grooves at both left and right ends, the inner bottom wall of the groove being fixedly connected to a first spring (105-4), and the pair of first springs (105-4) being fixedly connected to the first protection component (200). ) are fixedly connected at one end away from each other, a pair of first plug-in rods (105-5) at one end away from the first spring (105-4) slide out of the groove and are respectively adapted to be plugged with a pair of first fixed sleeves (105-3), a pair of first movable grooves (105-7) connected to the groove are formed on the side of the first cross bar (105-2) away from the first base (101), a first movable rod (105-6) slides through the pair of first movable grooves (105-7), and the inner ends of the pair of first movable rods (105-6) are respectively fixedly connected to the first plug-in rod (105-5).

5. The geotechnical engineering foundation pit protection device according to claim 1, characterized in that: The second protective mesh plate (202) comprises a second protective mesh plate body (202-1) and a second positioning plate (202-2) fixedly connected to the bottom of the second protective mesh plate body (202-1), the second positioning plate (202-2) is provided with third slots (202-3) interconnected with each other on the left and right sides, and the second positioning plate (202-2) is connected to the second base (201).

6. The geotechnical engineering foundation pit protection device according to claim 1, characterized in that: A second positioning groove (205) is provided on the top of the second base (201); the second positioning plate (202-2) is adapted to be plugged into the second positioning groove (205); fourth slots (206) communicating with each other are provided at left and right sides of the second base (201) corresponding to the second positioning groove (205); and the second fixing structure (203) is connected to the second base (201), the third slot (202-3), and the fourth slot (206).

7. The geotechnical engineering foundation pit protection device according to claim 1, characterized in that: The second fixing structure (203) has the same structure as the first fixing structure (105), and comprises a second limit plug plate (203-1) adapted to be plugged into the third slot (202-3) and the fourth slot (206), a second cross bar (203-2) fixedly connected to the outer side of the second limit plug plate (203-1), and a pair of second fixing sleeves (203-3) fixedly connected to the outer side of the second base (201), the second cross bar (203-2) having grooves at both the front and rear ends, the inner bottom wall of the groove being fixedly connected to a second spring (203-4), and the pair of second springs (203-4) being fixedly connected to the outer side of the second base (201). ) are fixedly connected at one end away from each other, a pair of second plug-in rods (203-5) at one end away from the second spring (203-4) slide out of the groove and are respectively adapted to be plugged with a pair of second fixed sleeves (203-3), a pair of second movable grooves (203-7) connected to the groove are formed on the side of the second cross bar (203-2) away from the second base (201), a second movable rod (203-6) slides through the pair of second movable grooves (203-7), and the inner ends of the pair of second movable rods (203-6) are respectively fixedly connected to the pair of second plug-in rods (203-5).

8. The geotechnical engineering foundation pit protection device according to claim 1, characterized in that: The fixing assembly (300) comprises a mounting plate (301) fixedly connected to the first base (101); an internally threaded tube (302) is fixedly passed through the mounting plate (301); a screw rod (303) is spirally passed through the internally threaded tube (302); a rotating knob (304) is fixedly connected to the top end of the screw rod (303); and a positioning cone (305) is fixedly connected to the bottom end of the screw rod (303).

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