Steel pipe pile through bolt secondary drilling device

By designing a secondary drilling device for the threaded bolt of steel pipe piles, using guide components and height adjustment components, the operational instability caused by construction workers in photovoltaic power stations due to squatting or bent over, and the installation accuracy of the threaded bolt is improved and drilling quality enhances construction efficiency.

CN222253824UActive Publication Date: 2024-12-27THE FOURTH ENG CORP OF NORTHWEST POWER CONSTR
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Patent Information

Application Number
CN202421238889.2
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-05-31
Publication Date
2024-12-27
Estimated Expiration
2034-05-31

AI Technical Summary

Technical Problem

During the construction of photovoltaic power stations, the stability of the photovoltaic bracket is limited by the installation accuracy of the through screws. In the existing technology, construction personnel need to squat or bend over for a long time to drill, resulting in fatigue and unstable operation, which affects the drilling effect and Installation accuracy.

Method used

Design a steel pipe pile-to-pass bolt secondary drilling device, including a base, a drilling rig, a guide assembly, a drive assembly and a height adjustment assembly, to ensure the stability of the drilling rig during the drilling process, the guide rod and the connecting ring The combined configuration ensures that the rig moves smoothly along the predetermined trajectory, and the height adjustment assembly allows the construction staff to adjust the rig height to avoid squatting or long-term bent operations.

Benefits of technology

It improves the installation accuracy and drilling quality of the threaded screw, reduces operating errors, enhances the stability and operation stability of the drilling rig, and improves construction efficiency.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of municipal engineering, in particular to a steel pipe pile through bolt secondary drilling device which comprises a base, a drilling machine, a guide assembly, a driving assembly and a height adjusting assembly, the guide assembly comprises a fixing piece, two guide rods and two sets of connecting rings, and the drilling machine is installed on the base through the fixing piece; the drilling machine is arranged in the length direction of the base, the two connecting rings are fixedly connected to the base, one guide rod penetrates through one connecting ring and can slide towards the side close to or away from the steel pipe pile in the length direction of the base, and the driving assembly is used for driving the drilling machine to move towards the side close to or away from the steel pipe pile. The height adjusting assembly is used for adjusting the drilling height of the drilling machine. According to the secondary drilling device for the opposite-penetrating bolt of the steel pipe pile, it is conveniently ensured that the drilling machine stably moves along a preset track through the guide assembly, deviation and errors caused by unstable operation are avoided, the drilling precision can be improved, and then the installation precision of the opposite-penetrating bolt is improved.
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Description

Technical Field

[0001] The present application relates to the technical field of municipal engineering, and in particular to a secondary drilling device for steel pipe piles with through-bolts. Background Art

[0002] During the construction of photovoltaic power stations, photovoltaic brackets are used as the basic structure to support photovoltaic modules, and their stability directly affects the power generation efficiency and operational safety of photovoltaic power stations. Therefore, after the photovoltaic brackets are installed and adjusted, the technical solution of drilling holes on the front and rear columns of the steel pipe piles and installing through-screws is widely used in the construction of photovoltaic power stations to improve the overall stability of the photovoltaic brackets.

[0003] In the prior art, the installation of through screws on the front and rear columns of photovoltaic brackets is mainly carried out by manual drilling. The through screws are installed after the drilling operation. First, it is necessary to determine the drilling position, prepare the drilling rig, through screws and other tools and materials, and then position the drilling rig at the preset position of the front and rear columns, start the drilling rig to perform the drilling operation, stop working after the drilling is completed, and then pass the through screws through the holes of the front and rear columns and extend them into the steel pipe piles. Finally, use nuts to tighten the two ends of the screws.

[0004] Regarding the above-mentioned related technologies, since the height of the through-fixing bolts at the top of the steel pipe piles in the photovoltaic area is generally about 12 cm, during the secondary drilling of the through-screws, construction workers need to squat or bend over for a long time, which can easily lead to fatigue, unstable operation, and even operational errors among construction workers, affecting the drilling effect and further affecting the installation accuracy of the through-screws. Utility Model Content

[0005] In order to improve the installation accuracy of the through-screw, the present application provides a secondary drilling device for the through-bolt of a steel pipe pile.

[0006] The present application provides a secondary drilling device for steel pipe pile through bolts, which adopts the following technical solution:

[0007] A secondary drilling device for a steel pipe pile through bolt, comprising a base, a drilling machine, a guide assembly, a driving assembly and a height adjustment assembly;

[0008] The guide assembly includes a fixing member, two guide rods and two sets of connecting rings;

[0009] The base is provided with through holes, the through holes are distributed along the length direction of the base, the drilling rig is installed on the base through the fixing member, the drilling rig is located directly above the through holes, and the drilling rig is arranged along the length direction of the through holes;

[0010] The two groups of connecting rings are both fixedly connected to the base, and the two groups of connecting rings are symmetrically distributed about the through hole;

[0011] One of the guide rods is respectively arranged through a group of the connecting rings, and the guide rod can slide in the connecting ring along the length direction of the base, toward or away from the steel pipe pile, and the two guide rods are symmetrically distributed about the through hole;

[0012] The driving assembly is used to drive the drilling rig to move toward or away from the steel pipe pile;

[0013] The height adjustment assembly is used to adjust the drilling height of the drilling rig.

[0014] By adopting the above technical solution, in the initial state, the drilling rig is located at an appropriate position on the base at a distance from the steel pipe pile. Then, according to the specific position of the steel pipe pile and the precise position where the hole needs to be drilled, the height of the drilling rig is adjusted through the height adjustment component. Then, the driving component is adjusted to drive the drilling rig to move along the axial direction of the guide rod to the side close to the steel pipe pile. At the same time, the guide rod base moves toward the side close to the steel pipe pile in the length direction. Until the drill bit of the drilling rig touches the surface of the steel pipe pile, the driving component is continued to be adjusted to perform the drilling operation on the steel pipe pile. Under the continuous drive of the driving component, the drilling rig penetrates into the interior of the steel pipe pile along the direction of the guide rod to complete the secondary drilling. After the hole reaches the predetermined depth or position, the driving component is adjusted to drive the drilling rig along the length direction of the base. Move to the side away from the steel pipe pile to retract until the drilling rig returns to the initial position. After the drilling is completed, install the through-screw at the opening; the steel pipe pile through-bolt secondary drilling device is convenient for ensuring the stability of the drilling rig during the drilling process through the guide component. The combination of the guide rod and the connecting ring can ensure that the drilling rig moves smoothly along the predetermined trajectory, avoiding deviations and errors caused by unstable operation, which is conducive to improving the accuracy of drilling and thus improving the installation accuracy of the through-screw; the height adjustment component allows construction personnel to adjust the height of the drilling rig according to actual needs, and there is no need to squat or bend over for a long time to operate. The operation is more stable and accurate, which is conducive to improving the drilling quality and drilling efficiency, and thus improving the installation accuracy of the through-screw.

[0015] Preferably, limit rings are provided at both ends of the guide rod.

[0016] By adopting the above technical solution, the set limit ring can ensure that the movement range of the guide rod is limited when the guide rod slides in the connecting ring along the length direction of the base, so that the guide rod always remains within the predetermined track, preventing the guide rod from falling off the connecting ring during movement.

[0017] Preferably, the fixing member comprises at least two sets of buckles, locking bolts and locking nuts;

[0018] At least two groups of buckles are respectively arranged on the top and bottom of the drilling rig, and at least two groups of buckles are symmetrically distributed about the drilling rig;

[0019] The locking bolt is arranged at the end of the buckle, and one end of the locking bolt passes through the upper and lower buckles in sequence and is threadedly connected with the locking nut, and the other end is fixedly connected to the two guide rods.

[0020] By adopting the above technical solution, at least two groups of clips are symmetrically arranged at the top and bottom of the drilling rig, so that when the drilling rig is subjected to various forces, the effective cooperation between the clips and the locking bolts can maintain the stability of its structure, ensuring that the drilling rig remains stable during operation; the arranged locking bolts enable the upper and lower clips to be tightly connected together and fixed by the locking nuts, which is beneficial to prevent the clips from loosening or falling off during operation, further enhancing the stability of the drilling rig; because the locking bolts can pass through the upper and lower clips and be threadedly connected to the locking nuts, the distance between the clips can be conveniently adjusted to adapt to drilling rigs of different sizes and types.

[0021] Preferably, two locking nuts are threadedly connected to each of the locking bolts, and a reinforcing gasket is provided between the locking nut and the buckle.

[0022] By adopting the above technical solution, two locking nuts are installed on the locking bolt to form a double locking structure, which is beneficial to increase the strength and stability of the connection part, so that the drilling rig is not easy to loosen or fall off during operation; the set reinforcing gasket can evenly distribute the pressure between the locking nut and the buckle, effectively avoiding the situation where the local pressure is too high due to the concentration of pressure between the buckle and the locking nut, thereby improving the service life of the parts.

[0023] Preferably, a hook for hanging with a steel pipe pile is provided at one end of the base close to the drill bit of the drilling rig.

[0024] By adopting the above technical solution, the connection between the hook and the steel pipe pile can firmly fix the entire drilling device on the steel pipe pile, which is conducive to reducing operational errors and drilling deviations caused by equipment shaking or movement, so that the drilling rig can maintain a more precise and stable path when drilling, which is conducive to improving drilling accuracy, thereby improving the installation accuracy of the through screw, and reducing safety hazards caused by equipment movement or shaking.

[0025] Preferably, the driving assembly comprises a pushing rod and a connecting frame plate;

[0026] One end of the push rod is rotatably connected to the base away from the hook, and the other end is fixedly connected to a handrail;

[0027] One end of the connecting frame plate is rotatably connected to the drilling rig, and the other end is rotatably connected to the pushing pressure rod.

[0028] By adopting the above technical scheme, the set thrust rod makes it convenient for the operator to flexibly control the movement and angle of the thrust rod by operating the handrail rod, and adjust the operating force and direction according to actual conditions, which is conducive to improving the flexibility and adaptability of the operation; one end of the connecting frame plate is rotatably connected to the drilling rig, and the other end is rotatably connected to the thrust rod, so that the connecting frame plate can adjust the angle as the thrust rod moves, thereby ensuring that the drilling rig always maintains an appropriate angle and position with the steel pipe pile, thereby improving the accuracy and stability of drilling.

[0029] Preferably, it further comprises a height adjustment component, wherein the height adjustment component comprises a fixed bracket, a sliding sleeve and an adjustment member;

[0030] The fixed bracket includes an integrally arranged support plate and two vertical rods, the two vertical rods are respectively fixedly connected to two ends of the support plate, and the two vertical rods are symmetrically distributed about the support plate;

[0031] The sliding sleeve is slidably connected to the vertical rod, and the sliding sleeve is fixedly connected to the base, and the base is located between the two vertical rods;

[0032] The adjusting member is used for adjusting the position of the sliding sleeve relative to the vertical rod.

[0033] By adopting the above technical solution, the setting of the height adjustment component enables the drilling device to adapt to steel pipe piles of different heights, and the sliding connection of the sliding sleeve on the vertical rod allows the height of the drilling rig to be freely adjusted to meet the needs of different working scenarios; the fixed bracket can provide a stable support foundation for the drilling rig, and the sliding connection between the sliding sleeve and the vertical rod is conducive to ensuring the stability of the base during the height adjustment process, preventing the drilling rig from shaking or tilting during operation.

[0034] Preferably, the adjusting member comprises an adjusting bolt;

[0035] A thread groove is provided on the vertical rod at intervals of 1 cm, and the length direction of the thread groove is perpendicular to the axial direction of the vertical rod;

[0036] The sleeve is provided with a connecting hole, and the adjusting bolt passes through the connecting hole and is threadedly connected in the thread groove.

[0037] By adopting the above technical solution, there is a thread groove every 1 cm on the vertical rod, which is convenient for the operator to connect the adjusting bolt with the thread grooves in different positions to achieve height adjustment accurate to the centimeter level; the threaded connection between the adjusting bolt and the thread groove can provide a stable fixing effect to prevent the position of the base and the drilling rig from being offset due to equipment vibration or external force during operation.

[0038] In summary, the present application includes at least one of the following beneficial technical effects:

[0039] 1. The set steel pipe pile through-bolt secondary drilling device is convenient for ensuring the stability of the drilling rig during the drilling process through the guide component. The combination of the guide rod and the connecting ring can ensure that the drilling rig moves smoothly along the predetermined trajectory, avoiding deviations and errors caused by unstable operation, which is conducive to improving the drilling accuracy, thereby improving the installation accuracy of the through-bolt; the set height adjustment component allows construction personnel to adjust the height of the drilling rig according to actual needs, and there is no need to squat or bend over for a long time to operate. The operation is more stable and accurate, which is conducive to improving the drilling quality and drilling efficiency, thereby improving the installation accuracy of the through-bolt.

[0040] 2. At least two sets of clips are symmetrically arranged at the top and bottom of the drilling rig, so that when the drilling rig is subjected to various forces, the effective cooperation between the clips and the locking bolts can maintain the stability of its structure, ensuring that the drilling rig remains stable during operation; the locking bolts are arranged so that the upper and lower clips can be tightly connected together and fixed by the locking nuts, which is conducive to preventing the clips from loosening or falling off during operation, and further enhancing the stability of the drilling rig; because the locking bolts can pass through the upper and lower clips and be threadedly connected with the locking nuts, the distance between the clips can be easily adjusted to adapt to drilling rigs of different sizes and types.

[0041] 3. The set push rod is convenient for the operator to flexibly control the movement and angle of the push rod by operating the handrail, and adjust the operating force and direction according to actual conditions, which is conducive to improving the flexibility and adaptability of the operation; one end of the connecting frame plate is rotatably connected to the drilling rig, and the other end is rotatably connected to the push rod, so that the connecting frame plate can adjust the angle as the push rod moves, thereby ensuring that the drilling rig always maintains an appropriate angle and position with the steel pipe pile, thereby improving the accuracy and stability of drilling. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the overall structure of the secondary drilling device for steel pipe piles with through bolts according to an embodiment of the present application.

[0043] Explanation of the accompanying drawings: 1. base; 11. through hole; 12. hook; 2. drilling rig; 3. guide assembly; 31. fixing piece; 311. buckle; 312. locking bolt; 313. locking nut; 314. reinforcing gasket; 32. guide rod; 321. limiting ring; 33. connecting ring; 4. driving assembly; 41. pushing rod; 411. handrail rod; 42. connecting frame plate; 5. height adjustment assembly; 51. fixing bracket; 511. support plate; 512. vertical rod; 52. sliding sleeve; 53. adjusting piece; 531. adjusting bolt; 532. threaded groove; 533. connecting hole. DETAILED DESCRIPTION

[0044] The following is combined with Figure 1 This application is described in further detail.

[0045] The embodiment of the present application discloses a secondary drilling device for a steel pipe pile through-bolt.

[0046] Reference Figure 1 A secondary drilling device for a steel pipe pile through-bolt includes a base 1, a drilling machine 2, a guide component 3, a driving component 4 and a height adjustment component 5.

[0047] Reference Figure 1 The guide assembly 3 includes a fixing member 31, two guide rods 32 and two groups of connecting rings 33; a through hole 11 is opened at the center of the base 1, and the through hole 11 is distributed along the length direction of the base 1. In this embodiment, the through hole 11 is arranged in a rectangular shape. The drilling rig 2 is installed on the base 1 through the fixing member 31 and the drilling rig 2 is located directly above the through hole 11. One end of the drill bit of the drilling rig 2 is arranged close to the steel pipe pile, and the drilling rig 2 is arranged along the length direction of the through hole 11 as a whole; the two groups of connecting rings 33 are welded to the top wall of the base 1, and the two groups of connecting rings 33 are symmetrically distributed about the through hole 11 and are located on the same side of the through hole 11. The two connecting rings 33 are respectively arranged near the two ends of the through hole 11 and distributed along the length direction of the through hole 11, and the plane where the connecting rings 33 are located is perpendicular to the plane where the base 1 is located; the two guide rods 32 are symmetrically distributed about the through hole 11, and a guide rod 32 located on one side of the through hole 11 is sequentially passed through the two connecting rings 33 located on the same side of the through hole 11, and the guide rod 32 can slide in the two connecting rings 33 along the length direction of the base 1 toward or away from one side of the steel pipe pile; in addition, in order to prevent the guide rod 32 from sliding out of the predetermined trajectory, limiting rings 321 are welded at both ends of the guide rod 32 in the present application.

[0048] Reference Figure 1 The fixing member 31 includes at least two groups of buckles 311, locking bolts 312, locking nuts 313 and reinforcing washers 314; in the present application, the buckles 311 can be set as two groups, three groups, or four groups, as long as a stable connection between the drilling rig 2 and the base 1 is achieved. In the present embodiment, the buckles 311 are provided with two groups, and the two groups of buckles 311 are respectively provided at the top and bottom of the drilling rig 2, and the two groups of buckles 311 are symmetrically distributed about the drilling rig 2, and the locking bolts 312 are provided at the ends of the buckles 311. The drill rig 2 has one end and one end of the locking bolt 312 passes through the buckle 311 at the bottom of the drill rig 2 and the buckle 311 at the top of the drill rig 2 in sequence and is threadedly connected to the locking nut 313. The bolt head of the locking bolt 312 is welded to the side wall of the guide rod 32. To ensure the stability of the connection between the buckle 311 and the locking bolt 312, two locking nuts 313 are provided in the present application. The two locking nuts 313 are threadedly connected to the locking bolt 312 in sequence, and a reinforcing gasket 314 is provided between the buckle 311 and the locking nut 313.

[0049] Reference Figure 1 The driving assembly 4 includes a push rod 41 and a connecting frame plate 42; one end of the push rod 41 is rotatably connected to the side of the base 1 away from the hook 12 through a sleeve, and the other end is welded to the handrail 411. The handrail 411 is axially perpendicular to the push rod 41, and the push rod 41 is tilted from high to low from the side close to the handrail 411 to the side away from the handrail 411. The connecting frame plate 42 is arranged in a rectangular shape, and the two relative support rods of the connecting frame plate 42 are respectively rotatably connected to the drilling rig 2 and the end of the push rod 41 away from the handrail 411 through the sleeve; the height adjustment assembly 5 includes a fixed bracket 51, a sliding sleeve 52 and an adjusting member 53; the fixed bracket 51 includes an integrally arranged support plate 511 and two vertical rods 512, the support plate 511 is horizontally arranged on the first surface, and the two vertical rods 512 are respectively welded to the support plate 51 1 and the two vertical rods 512 are symmetrically distributed about the support plate 511, the sliding sleeve 52 is slidably connected to the vertical rod 512 and slides along the length direction of the vertical rod 512, the base 1 and the drilling rig 2 are welded to the two sliding sleeves 52, and the base 1 and the drilling rig 2 are horizontally arranged between the two sliding sleeves; the adjusting member 53 includes an adjusting bolt 531, a thread groove 532 is provided on the vertical rod 512 at every 1 cm, the length direction of the thread groove 532 is perpendicular to the axial direction of the vertical rod 512, a connecting hole 533 is provided on the connecting sleeve, the adjusting bolt 531 passes through the connecting hole 533 and is threadedly connected in the thread groove 532 to adjust and fix the height of the sliding sleeve and the drilling rig 2; to ensure the fixing effect, two adjusting bolts 531 are provided in this embodiment, and two connecting holes 533 are provided on the corresponding sliding sleeve.

[0050] The implementation principle of a secondary drilling device for a steel pipe pile through-bolt in an embodiment of the present application is as follows: in an initial state, the drill rig 2 is located at an appropriate position on the base 1 at a distance from the steel pipe pile, and then the height of the drill rig 2 is adjusted by the height adjustment component 5 according to the specific position of the steel pipe pile and the precise position where the hole needs to be drilled, and then the drive component 4 is adjusted to drive the drill rig 2 to move along the axial direction of the guide rod 32 toward the side close to the steel pipe pile, and at the same time, the guide rod 32 moves toward the side close to the steel pipe pile in the length direction of the base 1 until the drill bit of the drill rig 2 contacts the surface of the steel pipe pile, and then the drive component 4 is continued to be adjusted to perform a drilling operation on the steel pipe pile. Under the continuous drive of the drive component 4, the drill rig 2 penetrates into the interior of the steel pipe pile along the direction of the guide rod 32 to complete the secondary drilling, and after the hole reaches a predetermined depth or position, the drive component 4 is adjusted to drive the drill rig 2 to move along the length direction of the base 1 toward the side away from the steel pipe pile for retraction until the drill rig 2 returns to the initial position, and after the drilling is completed, a through-bolt can be added to the hole.

[0051] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A secondary drilling device for steel pipe pile through bolts, characterized in that: It comprises a base (1), a drilling machine (2), a guide assembly (3), a driving assembly (4) and a height adjustment assembly (5); The guide assembly (3) comprises a fixing member (31), two guide rods (32) and two sets of connecting rings (33); The base (1) is provided with through holes (11), the through holes (11) are distributed along the length direction of the base (1), the drilling machine (2) is installed on the base (1) through the fixing member (31), the drilling machine (2) is located directly above the through holes (11), and the drilling machine (2) is arranged along the length direction of the through holes (11); The two groups of connecting rings (33) are both fixedly connected to the base (1), and the two groups of connecting rings (33) are symmetrically distributed about the through hole (11); One of the guide rods (32) is respectively passed through a group of the connecting rings (33), and the guide rod (32) can slide in the connecting ring (33) along the length direction of the base (1) toward or away from the steel pipe pile, and the two guide rods (32) are symmetrically distributed about the through hole (11); The driving assembly is used to drive the drilling machine (2) to move towards or away from the steel pipe pile; The height adjustment component (5) is used to adjust the drilling height of the drilling machine (2).

2. The secondary drilling device for steel pipe pile through bolts according to claim 1 is characterized in that: Limiting rings (321) are provided at both ends of the guide rod (32).

3. The secondary drilling device for steel pipe pile through bolts according to claim 1 is characterized in that: The fixing member (31) comprises at least two groups of buckles (311), a locking bolt (312) and a locking nut (313); At least two groups of the buckles (311) are respectively arranged at the top and the bottom of the drilling rig (2), and at least two groups of the buckles (311) are symmetrically distributed about the drilling rig (2); The locking bolt (312) is arranged at the end of the buckle (311), and one end of the locking bolt (312) passes through the upper and lower buckles (311) in sequence and is threadedly connected to the locking nut (313), and the other end is fixedly connected to the two guide rods (32).

4. The secondary drilling device for steel pipe pile through bolts according to claim 3 is characterized in that: Two locking nuts (313) are threadedly connected to each locking bolt (312), and a reinforcing gasket (314) is provided between the locking nut (313) and the buckle (311).

5. The secondary drilling device for steel pipe pile through bolts according to claim 1, characterized in that: The base (1) is provided with a hook (12) at one end close to the drill bit of the drilling machine (2) for being hooked to a steel pipe pile.

6. The secondary drilling device for steel pipe pile through bolts according to claim 5, characterized in that: The driving assembly (4) comprises a pushing rod (41) and a connecting frame plate (42); One end of the push rod (41) is rotatably connected to a side of the base (1) away from the hook (12), and the other end is fixedly connected to a handrail (411); One end of the connecting frame plate (42) is rotatably connected to the drilling machine (2), and the other end is rotatably connected to the pushing rod (41).

7. The secondary drilling device for steel pipe pile through bolts according to claim 1, characterized in that: It also includes a height adjustment component (5), wherein the height adjustment component (5) includes a fixed bracket (51), a sliding sleeve (52) and an adjustment member (53); The fixed bracket (51) comprises an integrally arranged support plate (511) and two vertical rods (512), wherein the two vertical rods (512) are respectively fixedly connected to two ends of the support plate (511), and the two vertical rods (512) are symmetrically distributed with respect to the support plate (511); The sliding sleeve (52) is slidably connected to the vertical rod (512), and the sliding sleeve (52) is fixedly connected to the base (1), and the base (1) is located between the two vertical rods (512); The adjusting member (53) is used to adjust the position of the sliding sleeve (52) relative to the vertical rod (512).

8. The secondary drilling device for steel pipe pile through bolts according to claim 7, characterized in that: The adjusting member (53) comprises an adjusting bolt (531); A thread groove (532) is provided on the vertical rod (512) at intervals of 1 cm, and the length direction of the thread groove (532) is perpendicular to the axial direction of the vertical rod (512); The sleeve is provided with a connection hole (533), and the adjustment bolt (531) passes through the connection hole (533) and is threadedly connected in the thread groove (532).