Building foundation reinforcing pile

Abstract

The utility model discloses a building foundation reinforcing pile, which belongs to the technical field of building foundations, and comprises a circular bottom plate, a main pile device, an auxiliary pile device, a hole sealing device and an adjusting device, the main pile device is arranged on the upper side of the circular bottom plate, a pile tip is fixedly arranged on the lower side of the circular bottom plate, the auxiliary pile device is arranged on the upper side of the main pile device, and the hole sealing device is arranged on the lower side of the circular bottom plate. The multiple hole sealing devices are installed on the main pile device and the auxiliary pile device, the adjusting device is arranged in the center of the main pile device and the center of the auxiliary pile device, the main pile device comprises a main cavity, the main cavity is fixedly installed on the upper side of a circular bottom plate, and multiple sets of open holes are formed in the side wall of the main cavity. Through the mode, the size of the side hole of the reinforcing pile can be quickly adjusted according to different requirements, so that the concrete distribution on the outer side wall of the reinforcing pile is changed, the integrity of the concrete in the reinforcing pile can be improved, and meanwhile, the friction force of the reinforcing pile entering a soil layer is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of building foundations, in particular to a building foundation reinforcement pile. Background Art

[0002] Building foundation reinforcement piles are a basic engineering measure used to improve the bearing capacity and stability of the foundation. The types of reinforcement piles include static pressure piles, cast-in-place piles and root piles. The principle of static pressure piles is to use a static pile driver to press the prefabricated piles into the soil section by section. This type of pile mainly uses the friction between the pile body and the soil and the resistance of the pile end to bear the load from the upper structure. Its advantages are no vibration and noise during construction, and little impact on the surrounding environment. The disadvantage is that a larger construction site is required to stack prefabricated piles and place pile drivers, and for some hard soil layers, pile driving may be difficult and requires greater pressure.

[0003] The Chinese patent with the publication number CN219568841U proposes a building foundation reinforcement pile, including a bottom plate, a plug-in cone is fixedly connected at the lower end of the bottom plate, a movable cavity is opened inside the plug-in cone, an insertion rod is provided at both ends of the movable cavity, and an insertion rod hole is opened at both ends of the plug-in cone to match the insertion rod, a guide block is provided between the insertion rods, and the moving direction of the guide block is perpendicular to the moving direction of the insertion rod, a fixed clamp is fixedly connected to the upper end of the bottom plate, and a foundation is provided above the bottom plate. The base is a base having a fixed connection with a fixing plate matched with a fixing clamp ring at the lower end thereof, a steel bar column is fixedly connected to the base, a moisture-proof membrane is provided at the lower end of the base plate, a waterproof layer is provided at the lower end of the moisture-proof membrane, a screw rod matched with the base plate is provided, one end of the screw rod is fixedly connected with a control handle, and the other end enters the active cavity and is rotatably connected to the derivation block, and the reinforcement pile is prevented from moving through the cooperation of the equipment active cavity, the insertion rod and the rod entry hole, and the formed foundation structure is kept stable through the cooperation of the fixing clamp plate and the fixing clamp ring.

[0004] However, the technical solution of this patent has the following problems:

[0005] This patent cannot quickly adjust the size of the side holes of the reinforcement pile according to different needs, and thus cannot quickly change the concrete distribution on the outer side wall of the reinforcement pile.

[0006] Therefore, those skilled in the art provide a building foundation reinforcement pile to solve the above problems. Utility Model Content

[0007] The purpose of the utility model is to provide a building foundation reinforcement pile to solve the problems raised in the above background technology.

[0008] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0009] A building foundation reinforcement pile, comprising a circular bottom plate, and further comprising: a main pile device, a secondary pile device, a sealing device and an adjusting device, wherein the main pile device is mounted on the upper side of the circular bottom plate, a pile tip is fixedly mounted on the lower side of the circular bottom plate, the secondary pile device is mounted on the upper side of the main pile device, a plurality of sealing devices are mounted on the main pile device and the secondary pile device, the adjusting device is arranged at the center of the main pile device and the secondary pile device, the main pile device comprises: a main cavity, the main cavity is fixedly mounted on the upper side of the circular bottom plate, a plurality of groups of openings are provided on the side wall of the main cavity, each group of openings is composed of four square openings arranged in an array along the circumference of the central axis of the main cavity, and a square protrusion is provided on the upper side of the square opening;

[0010] Furthermore, the sealing device comprises: a guide frame and a sealing plate, wherein the guide frame is fixedly mounted on a side of the square opening close to the center of the main cavity, the lower side of the sealing plate is rotatably connected to the square opening via a rotating shaft, and the upper side of the sealing plate is closely attached to a side of the square protrusion away from the center of the main cavity;

[0011] Furthermore, the sealing device further comprises: a transmission plate, wherein the middle side of the transmission plate is rotatably connected to a side of the guide frame close to the center of the main cavity through a rotating shaft, and the side of the transmission plate away from the center of the main cavity is closely attached to the upper side of the sealing plate;

[0012] Furthermore, the main pile device further comprises: a connecting assembly; the connecting assembly is installed on the upper side of the main cavity;

[0013] Furthermore, the connection assembly includes: a support plate and a fixed transverse plate, the support plate is fixedly mounted on the upper side of the main cavity, a circular hole is provided at the center of the support plate, a first cross slot is provided on the upper side of the support plate, and the fixed transverse plate is fixedly mounted on the lower side of the main cavity;

[0014] Furthermore, the auxiliary pile device comprises: a lower fixing plate and an auxiliary cavity, the lower side of the lower fixing plate is provided with a cross protrusion, the cross protrusion is inserted into the first cross slot, the auxiliary cavity is fixedly installed on the upper side of the lower fixing plate, and the auxiliary cavity is also provided with a square opening;

[0015] Furthermore, the auxiliary pile device further comprises: an upper fixing plate, the upper fixing plate is fixedly mounted on the upper side of the auxiliary cavity, a second cross slot is provided on the upper side of the upper fixing plate, and the second cross slot is the same as the first cross slot;

[0016] Furthermore, the adjustment device comprises: a main support rod, a secondary support rod and an extension block, the lower side of the main support rod is threadedly connected to the middle side of the fixed horizontal plate, a plurality of the secondary support rods are slidably connected to the main support rod up and down, the upper and lower adjacent secondary support rods are threadedly connected together, and a plurality of extension blocks are fixedly installed on the outer side wall of the secondary support rod, and the extension blocks correspond to the square openings one by one;

[0017] Furthermore, the adjustment device further comprises: a locking assembly, the locking assembly being mounted on the upper side of the uppermost auxiliary support rod;

[0018] Furthermore, the locking assembly includes: a hollow circular rod, a first rotating rod, a vertical rod, a second rotating rod, a third rotating rod, a sliding block and a nut, the hollow circular rod being threadedly connected to the upper side of the uppermost auxiliary support rod, multiple first rotating rods being rotatably connected to the lower side of the hollow circular rod by a rotating shaft, the lower side of the vertical rod being rotatably connected to an end of the first rotating rod away from the hollow circular rod by a rotating shaft, the second rotating rod being rotatably connected to the middle side of the hollow circular rod by the rotating shaft, the end of the second rotating rod away from the hollow circular rod being rotatably connected to the middle side of the vertical rod by the rotating shaft, the third rotating rod being rotatably connected to the upper side of the vertical rod by the rotating shaft, the sliding block being slidably connected to the upper side of the hollow circular rod, the end of the third rotating rod away from the vertical rod being rotatably connected to the sliding block by the rotating shaft, the nut being threadedly connected to the upper side of the hollow circular rod, and the nut being located on the upper side of the sliding block.

[0019] Compared with the prior art, the beneficial effects of the utility model are as follows: 1. The utility model drives the extension block to rotate by rotating the auxiliary support rod of the adjusting device, so that the extension block stops when it rotates to the lower side of the transmission plate, and the auxiliary support rod moves upward to drive the extension block to move upward, and the extension block moves upward to drive the transmission plate close to the center of the main cavity to rotate upward, so that the side of the rotating plate away from the center of the main cavity moves downward, so that the upper side of the sealing plate rotates toward the side away from the center of the main cavity, and the square opening is opened. The opening and closing size of the square opening is adjusted by the distance the auxiliary support rod moves downward, and concrete is guided to flow out of the square opening through the guide plate, which is conducive to quickly adjusting the size of the square opening according to different needs, and the concrete is discharged to the soil layer on the outer wall of the main cavity through the square opening, which is conducive to improving the overall grip strength of the main cavity in the soil layer;

[0020] 2. The main cavity is inserted into the soil layer by a pile driver, and the sealing plate of the sealing device seals the square opening on the side wall of the main cavity, so that the external soil layer cannot enter the main cavity, avoiding the mixing of mud into the reinforcement pile, thereby improving the integrity of the concrete in the reinforcement pile and reducing the friction force of the main cavity entering the soil layer; the lower fixing plate of the auxiliary pile device is inserted into the first cross groove on the upper side of the support plate, and the lower fixing plate and the support plate are fixed together by welding, so that the auxiliary cavity is fixed on the upper side of the main cavity, so as to achieve the purpose of extending the main cavity, which is beneficial to extend the foundation reinforcement pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of the utility model;

[0022] Figure 2 This is a front view of the utility model;

[0023] Figure 3 It is a top view of the utility model;

[0024] Figure 4 For along Figure 3 Section view in the AA direction;

[0025] Figure 5 For along Figure 3 A schematic diagram of a part of the structure of a three-dimensional image with a portion of AA cut away;

[0026] Figure 6 It is a partial structural schematic diagram of the locking assembly and the auxiliary support rod of the utility model.

[0027] In the figure: 1. circular bottom plate; 2. main pile device; 21. main cavity; 22. square opening; 23. support plate; 24. fixed horizontal plate; 25. first cross slot; 3. auxiliary pile device; 31. lower side fixed plate; 32. auxiliary cavity; 33. upper side fixed plate; 34. second cross slot; 4. sealing device; 41. guide frame; 42. sealing plate; 43. transmission plate; 5. adjustment device; 51. main support rod; 52. auxiliary support rod; 53. extension block; 54. hollow round rod; 55. first rotating rod; 56. vertical rod; 57. second rotating rod; 58. third rotating rod; 59. sliding block; 510. nut; 6. pile tip. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] The terms “left”, “right”, “front”, “back”, “up” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0030] Embodiment 1: In some embodiments, please refer to the drawings of the specification Figure 1-Figure 6A building foundation reinforcement pile comprises a circular bottom plate 1, and also comprises: a main pile device 2, a secondary pile device 3, a sealing device 4 and an adjusting device 5, wherein the main pile device 2 is mounted on the upper side of the circular bottom plate 1, and a pile tip 6 is fixedly mounted on the lower side of the circular bottom plate 1, the secondary pile device 3 is mounted on the upper side of the main pile device 2, and a plurality of sealing devices 4 are mounted on the main pile device 2 and the secondary pile device 3, and the adjusting device 5 is arranged at the center of the main pile device 2 and the secondary pile device 3, and the main pile device 2 comprises: a main cavity 21, the main cavity 21 is fixedly mounted on the upper side of the circular bottom plate 1, and a plurality of groups of openings are provided on the side wall of the main cavity 21, and each group of openings is composed of four square openings 22 arranged in a circular array along the central axis of the main cavity 21, and a square protrusion is provided on the upper side of the square opening 22.

[0031] The main pile device 2 is inserted into the preset position by a pile driver. If the main pile device 2 is not long enough, multiple auxiliary pile devices 3 are added according to actual needs. The square openings 22 on the main pile device 2 and the auxiliary pile device 3 are adjusted by the sealing device 4 and the adjusting device 5. The opening and closing states thereof are changed according to different construction requirements. Concrete is poured into the main cavity 21 by external equipment, and the concrete is guided to be discharged through the multiple square openings 22 on the side wall of the main cavity 21, so that the concrete is discharged to the soil layer on the outer side wall of the main cavity 21, thereby improving the overall grip strength of the main cavity 21 in the soil layer.

[0032] The sealing device 4 includes: a guide frame 41 and a sealing plate 42. The guide frame 41 is fixedly installed on one side of the square opening 22 close to the center of the main cavity 21. The lower side of the sealing plate 42 is rotatably connected to the square opening 22 through a rotating shaft. The upper side of the sealing plate 42 is tightly attached to the side of the square protrusion away from the center of the main cavity 21.

[0033] The main cavity 21 is inserted into the soil layer by a pile driver, and the sealing plate 42 of the sealing device 4 seals the square opening on the side wall of the main cavity 21, so that the external soil layer cannot enter the main cavity 21. The guide plate is used to guide the flow of concrete to the square opening.

[0034] The sealing device 4 also includes: a transmission plate 43, the middle side of which is rotatably connected to the side of the guide frame 41 close to the center of the main cavity 21 through a rotating shaft, and the side of the transmission plate 43 away from the center of the main cavity 21 is closely attached to the upper side of the sealing plate 42.

[0035] By rotating the transmission plate 43, the rotating plate moves downward away from the center of the main cavity 21, so that the upper side of the sealing plate 42 rotates toward the side away from the center of the main cavity 21, opening the square opening 22, and the concrete flows out of the square opening 22 through the guide plate.

[0036] The main pile device 2 further includes a connecting assembly, which is installed on the upper side of the main cavity 21 .

[0037] The connecting assembly includes: a support plate 23 and a fixed transverse plate 24. The support plate 23 is fixedly installed on the upper side of the main cavity 21. A circular hole is provided in the center of the support plate 23. A first cross slot 25 is provided on the upper side of the support plate 23. The fixed transverse plate 24 is fixedly installed on the lower side of the main cavity 21. The support plate 23 is used to connect the secondary pile device 3, and the fixed transverse plate 24 is used to fix the adjustment device 5.

[0038] The auxiliary pile device 3 includes: a lower fixing plate 31 and an auxiliary cavity 32. The lower side of the lower fixing plate 31 is provided with a cross protrusion, and the cross protrusion is inserted into the first cross slot 25. The auxiliary cavity 32 is fixedly installed on the upper side of the lower fixing plate 31, and the auxiliary cavity 32 is also provided with a square opening 22.

[0039] The lower fixing plate 31 of the auxiliary pile device 3 is inserted into the first cross slot 25 on the upper side of the support plate 23, and the lower fixing plate 31 and the support plate 23 are fixedly connected together by welding, so that the auxiliary cavity 32 is fixed on the upper side of the main cavity 21, thereby achieving the purpose of extending the main cavity 21, which is beneficial to extending the foundation reinforcement pile.

[0040] The auxiliary pile device 3 further includes: an upper fixing plate 33, which is fixedly mounted on the upper side of the auxiliary cavity 32, and a second cross slot 34 is provided on the upper side of the upper fixing plate 33, and the second cross slot 34 is the same as the first cross slot 25, and another auxiliary pile device 3 is connected through the upper fixing plate 33, and the main cavity 21 is formed by continuously stacking the auxiliary pile devices 3.

[0041] The adjusting device 5 includes: a main support rod 51, a secondary support rod 52 and an extension block 53. The lower side of the main support rod 51 is threadedly connected to the middle side of the fixed cross plate 24. Multiple secondary support rods 52 are slidably connected to the main support rod 51 up and down. The upper and lower adjacent secondary support rods 52 are connected together by threads. Multiple extension blocks 53 are fixedly installed on the outer side wall of the secondary support rod 52, and the extension blocks 53 correspond to the square openings 22 one by one.

[0042] The rotation of the auxiliary support rod 52 of the adjusting device 5 drives the extension block 53 to rotate, so that the extension block 53 stops when it rotates to the lower side of the transmission plate 43, and the auxiliary support rod 52 moves upward to drive the extension block 53 to move upward. The extension block 53 moves upward to drive the transmission plate 43 to rotate upward on the side close to the center of the main cavity 21, so that the rotating plate moves downward on the side away from the center of the main cavity 21, so that the upper side of the sealing plate 42 rotates toward the side away from the center of the main cavity 21, and the square opening 22 is opened. The opening and closing size of the square opening 22 is adjusted according to the distance that the auxiliary support rod 52 moves downward. The concrete is guided out of the square opening 22 by the guide plate, and is discharged to the soil layer on the outer wall of the main cavity 21 through the square opening 22, thereby improving the overall grip strength of the main cavity 21 in the soil layer.

[0043] Embodiment 2: In some embodiments, Figure 1-Figure 6 As a preferred embodiment of the utility model, the adjusting device 5 also includes: a locking component, which is installed on the upper side of the uppermost auxiliary support rod 52, and the locking component is used to lock the auxiliary support rod 52 so that it cannot move up and down.

[0044] The locking assembly includes: a hollow round rod 54, a first rotating rod 55, a vertical rod 56, a second rotating rod 57, a third rotating rod 58, a sliding block 59 and a nut 510. The hollow round rod 54 is threadedly connected to the upper side of the uppermost auxiliary support rod 52, and the first rotating rods 55 are rotatably connected to the lower side of the hollow round rod 54 through a rotating shaft. The lower side of the vertical rod 56 is rotatably connected to the end of the first rotating rod 55 away from the hollow round rod 54 through a rotating shaft. The second rotating rod 57 is rotatably connected to the lower side of the hollow round rod 54 through a rotating shaft. On the middle side of the hollow round rod 54, the end of the second rotating rod 57 away from the hollow round rod 54 is rotatably connected to the middle side of the vertical rod 56 through a rotating shaft, the third rotating rod 58 is rotatably connected to the upper side of the vertical rod 56 through a rotating shaft, the sliding block 59 is slidably connected to the upper side of the hollow round rod 54, and the end of the third rotating rod 58 away from the vertical rod 56 is rotatably connected to the sliding block 59 through a rotating shaft, and the nut 510 is threadedly connected to the upper side of the hollow round rod 54, and the nut 510 is located on the upper side of the sliding block 59.

[0045] The nut 510 of the locking assembly rotates to cause the nut 510 to move downward, and the downward movement of the nut 510 drives the sliding block 59 to move downward. The downward movement of the sliding block 59 drives the third rotating rod 58 to rotate and move downward at the same time. The downward movement of the third rotating rod 58 drives the vertical rod 56 to move toward a position away from the center of the auxiliary cavity 32. The first rotating rod 55, the second rotating rod 57, the hollow rod and the vertical rod 56 form a parallelogram, so that the first rotating rod 55 and the second rotating rod 57 rotate following the movement of the vertical rod 56. At the same time, the vertical rod 56 always maintains a vertical state and moves away from the center of the auxiliary cavity 32. When the vertical rod 56 contacts the inner wall of the auxiliary cavity 32, the nut 510 is stopped, so that the locking assembly is quickly locked on the inner wall of the auxiliary cavity 32. At this time, the auxiliary support rod 52 is fixed and cannot move up and down. The square opening can always be kept open when pouring concrete. After the concrete is poured, the locking assembly can be immediately taken out and rinsed for secondary use.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A building foundation reinforcement pile, comprising a circular base plate (1), characterized in that: Also includes: A main pile device (2), a secondary pile device (3), a sealing device (4) and an adjusting device (5), wherein the main pile device (2) is mounted on the upper side of a circular bottom plate (1), a pile tip (6) is fixedly mounted on the lower side of the circular bottom plate (1), the secondary pile device (3) is mounted on the upper side of the main pile device (2), a plurality of sealing devices (4) are mounted on the main pile device (2) and the secondary pile device (3), the adjusting device (5) is arranged at the center of the main pile device (2) and the secondary pile device (3), and the main pile device (2) comprises: a main cavity (21), the main cavity (21) is fixedly mounted on the upper side of the circular bottom plate (1), a plurality of groups of openings are provided on the side wall of the main cavity (21), each group of openings is composed of four square openings (22) arranged in a circular array along the central axis of the main cavity (21), and a square protrusion is provided on the upper side of the square opening (22).

2. The building foundation reinforcement pile according to claim 1, characterized in that: The sealing device (4) comprises: a guide frame (41) and a sealing plate (42); the guide frame (41) is fixedly mounted on a side of the square opening (22) close to the center of the main cavity (21); the lower side of the sealing plate (42) is rotatably connected to the square opening (22) via a rotating shaft; and the upper side of the sealing plate (42) is closely attached to a side of the square protrusion away from the center of the main cavity (21).

3. The building foundation reinforcement pile according to claim 2, characterized in that: The sealing device (4) further comprises: a transmission plate (43), the middle side of the transmission plate (43) being rotatably connected to a side of the guide frame (41) close to the center of the main cavity (21) via a rotating shaft, and the side of the transmission plate (43) away from the center of the main cavity (21) being in close contact with the upper side of the sealing plate (42).

4. The building foundation reinforcement pile according to claim 1, characterized in that: The main pile device (2) further comprises: a connection assembly; the connection assembly is installed on the upper side of the main cavity (21).

5. The building foundation reinforcement pile according to claim 4, characterized in that: The connection assembly comprises: a support plate (23) and a fixed transverse plate (24); the support plate (23) is fixedly mounted on the upper side of the main cavity (21); a circular hole is provided at the center of the support plate (23); a first cross slot (25) is provided on the upper side of the support plate (23); and the fixed transverse plate (24) is fixedly mounted on the lower side of the interior of the main cavity (21).

6. The building foundation reinforcement pile according to claim 1, characterized in that: The auxiliary pile device (3) comprises: a lower fixing plate (31) and an auxiliary cavity (32); a cross protrusion is provided on the lower side of the lower fixing plate (31), and the cross protrusion is inserted into the first cross slot (25); the auxiliary cavity (32) is fixedly mounted on the upper side of the lower fixing plate (31), and the auxiliary cavity (32) is also provided with a square opening (22).

7. The building foundation reinforcement pile according to claim 6, characterized in that: The auxiliary pile device (3) further comprises: an upper fixing plate (33), the upper fixing plate (33) being fixedly mounted on the upper side of the auxiliary cavity (32), a second cross slot (34) being provided on the upper side of the upper fixing plate (33), the second cross slot (34) being identical to the first cross slot (25).

8. The building foundation reinforcement pile according to claim 1, characterized in that: The adjusting device (5) comprises: a main support rod (51), a secondary support rod (52) and an extension block (53); the lower side of the main support rod (51) is threadedly connected to the middle side of the fixed horizontal plate (24); a plurality of secondary support rods (52) are slidably connected to the main support rod (51) in an upward and downward manner; the upper and lower adjacent secondary support rods (52) are threadedly connected together; and a plurality of extension blocks (53) are fixedly mounted on the outer side wall of the secondary support rod (52).

9. The building foundation reinforcement pile according to claim 8, characterized in that: The adjusting device (5) further comprises: a locking assembly, wherein the locking assembly is mounted on the upper side of the uppermost auxiliary support rod (52).

10. The building foundation reinforcement pile according to claim 9, characterized in that: The locking assembly comprises: a hollow round rod (54), a first rotating rod (55), a vertical rod (56), a second rotating rod (57), a third rotating rod (58), a sliding block (59) and a nut (510); the hollow round rod (54) is threadedly connected to the upper side of the uppermost auxiliary support rod (52); a plurality of the first rotating rods (55) are rotatably connected to the lower side of the hollow round rod (54) via a rotating shaft; the lower side of the vertical rod (56) is rotatably connected to an end of the first rotating rod (55) away from the hollow round rod (54) via a rotating shaft; the second rotating rod (57) is rotatably connected to the lower side of the hollow round rod (54) via a rotating shaft On the middle side of the hollow round rod (54), one end of the second rotating rod (57) away from the hollow round rod (54) is rotatably connected to the middle side of the vertical rod (56) via a rotating shaft, the third rotating rod (58) is rotatably connected to the upper side of the vertical rod (56) via a rotating shaft, the sliding block (59) is slidably connected to the upper side of the hollow round rod (54), one end of the third rotating rod (58) away from the vertical rod (56) is rotatably connected to the sliding block (59) via a rotating shaft, and the nut (510) is threadedly connected to the upper side of the hollow round rod (54), and the nut (510) is located on the upper side of the sliding block (59).

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