Polygonal scaffold construction platform for circular structure

Abstract

The polygonal scaffold construction platform for the circular structure comprises rectangular scaffold units and connecting assemblies, every two adjacent rectangular scaffold units are arranged in an included angle mode, each rectangular scaffold unit comprises a vertical rod set and a walking platform, and each vertical rod set comprises two outer side vertical rods and two inner side vertical rods; each connecting assembly comprises a supporting frame and a trapezoid pedal, each supporting frame comprises a radial horizontal rod and an annular horizontal rod, each radial horizontal rod is connected between the corresponding inner side vertical rod and the corresponding outer side vertical rod which are adjacent to each other, and the inner side vertical rods and the outer side vertical rods, close to each other, of the two adjacent rectangular scaffolds correspond to each other. The annular horizontal rods are connected between the two corresponding inner side vertical rods and the two corresponding outer side vertical rods respectively, and a plurality of trapezoidal pedals are laid on the supporting frame in parallel. The connecting structure has the effects that stable connection between the adjacent rectangular scaffolds in the circular structure is achieved, and the stability and safety of the scaffolds are improved.

Description

Technical Field

[0001] The present application relates to the technical field of building construction, and in particular to a polygonal scaffolding construction platform for a circular structure. Background Art

[0002] In construction projects, socket-type disc-type scaffolding is widely used. In the construction of circular structures, the working scaffolding basically adopts the idea of ​​​​bending instead of bending. Conventional standard rods are used to build the scaffolding structure, and several standard rectangular units are built along the circumference of the structure. Since a trapezoidal gap will be formed between adjacent rectangular units, the trapezoidal gap is generally connected into a whole by steel pipe fasteners. However, the connection quality of the fasteners is not easy to control. This connection method reduces the overall stability of the scaffolding, and also reduces the construction efficiency of the disc-type scaffolding, and increases the labor cost of the disc-type scaffolding.

[0003] Normally, it is necessary to lay standard pedals in the trapezoidal gaps of the working layer, and several standard rectangular pedals are arranged in the gaps along the diameter direction of the circular scaffolding. However, after laying standard pedals in the trapezoidal area, triangular or trapezoidal gaps will appear at the edge. Generally, a layer of pedals is placed on top of the laid pedals to fill the gaps in the triangular or trapezoidal areas. The standard rectangular pedals stacked on top are fixed to the bottom pedals with wire. This method of stacking standard pedals to fill the gaps is not stable enough on the one hand, and on the other hand, it will also form bulges and height differences on the platform layer, which will cause certain safety hazards when workers are working on the platform layer. Therefore, it is urgent to use a connection structure to solve the problems existing in the design and use of circular structure socket-type disc-type scaffolding construction platforms. Utility Model Content

[0004] In order to achieve a stable connection between adjacent rectangular scaffolds in a circular structure and improve the stability and safety of the scaffolds, the present application provides a polygonal scaffolding construction platform for a circular structure.

[0005] The polygonal scaffolding construction platform for a circular structure provided in this application adopts the following technical solution:

[0006] A polygonal scaffolding construction platform for a circular structure, comprising a rectangular scaffolding unit and a connection assembly, wherein a plurality of the rectangular scaffolding units are arranged along the circumferential direction, and two adjacent rectangular scaffolding units are arranged at an angle, wherein the rectangular scaffolding unit comprises a vertical pole group and a walking platform, wherein the vertical pole group comprises two vertically arranged outer vertical poles and two inner vertical poles, wherein the walking platform is horizontally connected with a plurality of vertical poles between the inner vertical poles and the outer vertical poles, wherein the connection assembly comprises a supporting frame and a trapezoidal pedal, wherein the supporting frame comprises radial horizontal poles and annular horizontal poles, wherein the radial horizontal poles are connected to two adjacent said vertical poles. Between the inner uprights and the outer uprights, the inner uprights of two adjacent groups of the rectangular scaffoldings close to each other correspond to each other, and the outer uprights of two adjacent groups of the rectangular scaffoldings close to each other correspond to each other. One of the circumferential horizontal rods is connected between the corresponding two inner uprights and the corresponding two outer uprights, and the two circumferential horizontal rods and the two radial horizontal rods are located in the same horizontal plane. Several trapezoidal pedals are laid in parallel on the support frame, and the length specifications of the several trapezoidal pedals are different. The trapezoidal pedals are arranged along the length direction of the circumferential horizontal rods, and the two ends of the trapezoidal pedals are respectively connected to the two radial horizontal rods.

[0007] By adopting the above technical solution, the support frame is connected between two adjacent rectangular scaffolding units, and a number of trapezoidal pedals of different lengths are connected to the support frame to fill the gaps therein, thereby avoiding gaps or protrusions on the walkway and improving the safety of the scaffolding. Through the mutual cooperation of the rectangular scaffolding units and the connecting components, the effect of achieving a stable connection between adjacent rectangular scaffoldings in a circular structure and improving the stability and safety of the scaffolding is achieved.

[0008] Optionally, a supporting truss is connected between the corresponding two outer vertical poles and the corresponding two inner vertical poles, and the supporting truss includes a transverse support rod and a reinforcing support rod. Two transverse support rods are arranged in parallel, and the transverse support rods correspond to and are connected to the corresponding two outer vertical poles and the corresponding two inner vertical poles one by one, and a plurality of reinforcing support rods are connected between the two transverse support rods.

[0009] By adopting the above technical solution, the supporting truss is connected between two corresponding inner uprights and two corresponding outer uprights, thereby increasing the structural stability and safety of the scaffolding.

[0010] Optionally, both ends of the trapezoidal pedal in the length direction are connected with overlapping hooks, and the overlapping hooks are arranged above the corresponding radial horizontal rods, and the vertical plane where the overlapping hooks are located is arranged perpendicular to the length direction of the radial horizontal rods.

[0011] By adopting the above technical solution, the lap hook is lapped on the radial horizontal rod, realizing the detachable connection between the trapezoidal pedal and the radial horizontal rod. Since the vertical plane where the lap hook is located is perpendicular to the length direction of the radial horizontal rod, the lap hook can be stably connected to the radial horizontal rod.

[0012] Optionally, a limit plate is provided on the bottom surface of both ends of the trapezoidal pedal in the length direction, and a plug-in plate is slidably inserted in the limit plate, and the plug-in plate abuts against the bottom end of the radial horizontal rod.

[0013] By adopting the above technical solution, the plug-in plate and the overlapping hook simultaneously limit the trapezoidal pedal, thereby reducing the possibility of the trapezoidal pedal falling off the supporting frame.

[0014] Optionally, the bottom ends of the inner and outer uprights are each provided with an adjustable base, and the adjustable base includes an adjusting screw, a supporting base plate, and an adjusting support nut, the adjusting screw is connected to the top surface of the supporting base plate, the adjusting support nut is threadedly connected to the adjusting screw, the inner and outer uprights are sleeved on the adjusting screw, and the adjusting support nut abuts against the bottom ends of the inner and outer uprights.

[0015] By adopting the above technical solution, when the height of the rectangular scaffolding unit needs to be adjusted, the adjusting support nut is screwed, and the adjusting support nut moves along its length direction on the adjusting screw rod, and the adjusting support nut abuts against the bottom ends of the inner and outer uprights, thereby achieving height adjustment of the rectangular scaffolding unit, so that two adjacent walking platforms can be located at the same height, avoiding height differences on the walkway.

[0016] Optionally, a horizontal railing is connected between the two corresponding outer upright poles and the two corresponding inner upright poles.

[0017] By adopting the above technical solution, the horizontal railings shield both sides of the supporting frame in the width direction, protect the operators, and improve the safety of the scaffolding.

[0018] Optionally, a supporting diagonal rod is obliquely connected between the corresponding two outer vertical poles and the corresponding two inner vertical poles.

[0019] By adopting the above technical solution, the setting of the supporting diagonal rods realizes the support of the scaffolding, which helps to improve the structural strength and stability of the scaffolding.

[0020] Optionally, the annular horizontal rod is connected to the outer vertical rod and the inner vertical rod by a connecting assembly, which includes a connecting disc buckle, a buckle joint and a wedge-shaped pin. One connecting disc buckle is provided on the inner vertical rod and the outer vertical rod, and a plurality of connecting holes are provided on the connecting disc buckle at equal angular intervals along the circumferential direction. One buckle joint is provided at both ends of the annular horizontal rod. An insertion groove is provided at the end of the buckle joint away from the annular horizontal rod, and a connecting through groove connected to the insertion groove is provided on the buckle joint along the longitudinal direction. The connecting disc buckle is inserted in the insertion groove, and the wedge-shaped pin passes through the connecting through groove and the connecting hole through the connecting disc buckle and the buckle joint. The buckle joint is arranged at an angle to the annular horizontal rod, and the length direction of the buckle joint coincides with the length direction of one of the connecting holes.

[0021] By adopting the above technical solution, since there is a certain angle between the buckle joint and the annular horizontal rod, the plug-in groove on the buckle joint can maintain the same direction as one of the connecting holes, which is convenient for the operator to install the annular horizontal rod.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. Through the cooperation of the rectangular scaffolding units and the connecting components, it has the effect of achieving a stable connection between adjacent rectangular scaffoldings in the circular structure and improving the stability and safety of the scaffolding;

[0024] 2. The plug-in plate and the lap hook simultaneously limit the position of the trapezoidal pedal, reducing the possibility of the trapezoidal pedal falling off the supporting frame;

[0025] 3. The setting of the supporting diagonal rods realizes the support of the scaffolding, which helps to improve the structural strength and stability of the scaffolding. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of an embodiment of the present application for embodying a polygonal scaffolding construction platform for a circular structure.

[0027] Figure 2 It is a structural diagram used to reflect the connection components in the embodiment of the present application.

[0028] Figure 3 yes Figure 1 Enlarged view of part A in the middle.

[0029] Figure 4 yes Figure 2 Enlarged view of part B in the middle.

[0030] Explanation of the reference numerals: 1. rectangular scaffolding unit; 101. inner vertical pole; 102. outer vertical pole; 103. walking platform; 2. connecting assembly; 21. supporting frame; 211. circumferential horizontal rod; 212. radial horizontal rod; 22. trapezoidal pedal; 3. connecting assembly; 31. connecting disc buckle; 311. connecting hole; 32. buckle joint; 321. plug-in slot; 322. connecting through slot; 33. wedge-shaped pin; 4. adjustable base; 41. adjusting screw; 42. supporting base plate; 43. adjusting support nut; 5. overlapping hook; 6. limiting plate; 61. plug-in through hole; 7. plug-in plate; 8. supporting truss; 81. reinforcing support rod; 82. transverse support rod; 9. horizontal railing; 10. supporting diagonal rod. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-4 The present application is further described in detail. The embodiment of the present application provides a polygonal scaffolding construction platform for a circular structure, which has the effect of realizing a stable connection between adjacent rectangular scaffoldings in the circular structure and improving the stability and safety of the scaffolding.

[0032] Reference Figure 1 and Figure 2 A polygonal scaffolding construction platform for a circular structure includes a rectangular scaffolding unit 1, a connection assembly 2, a connection assembly 3 and an adjustable base 4. A plurality of rectangular scaffolding units 1 are arranged at equal angles along the circumference, and the connection assembly 2 is arranged between two adjacent rectangular scaffolding units 1. The rectangular scaffolding unit 1 includes a vertical pole group and a walking platform 103. The vertical pole group includes two inner vertical poles 101 located on the inner side of the annular structure and two outer vertical poles 102 located on the outer side of the annular structure. The two inner vertical poles 101 and the two outer vertical poles 102 are located at the four corners of the rectangle. A plurality of walking platforms 103 are arranged in parallel between the two inner vertical poles 101 and the two outer vertical poles 102.

[0033] Reference Figure 1 and Figure 2 The connection assembly 2 includes a support frame 21 and a trapezoidal pedal 22. The support frame 21 is horizontally arranged between two adjacent rectangular scaffolding units 1. The support frame 21 includes two circumferential horizontal rods 211 and two radial horizontal rods 212. The radial horizontal rods 212 are arranged along the radial direction of the annular structure, and the radial horizontal rods 212 are connected between the corresponding inner vertical rods 101 and the outer vertical rods 102. The circumferential horizontal rods 211 are arranged along the tangent direction of the annular structure, and the circumferential horizontal rods 211 are arranged between the two inner vertical rods 101 and the two outer vertical rods 102 of the two adjacent rectangular scaffolding units 1. The two radial horizontal rods 212 and the two circumferential horizontal rods 211 are located in the same horizontal plane.

[0034] Reference Figure 2 and Figure 3 The annular horizontal rod 211 is connected to the vertical rod group through a connecting assembly 3. The connecting assembly 3 includes a connecting disc buckle 31, a buckle joint 32 and a wedge-shaped pin 33. The connecting disc buckle 31 is welded to the inner vertical rod 101 and the outer vertical rod 102. Eight connecting holes 311 are opened on the connecting disc buckle 31 at equal angles. The length direction of one of the connecting holes 311 coincides with the length direction of the radial horizontal rod 212.

[0035] Reference Figure 2 and Figure 3 The buckle joint 32 is welded to one of the two ends of the annular horizontal rod 211, and a plug-in slot 321 is provided at one end of the welded joint away from the annular horizontal rod 211. A connecting slot 322 is provided on the buckle joint 32 along the vertical direction, and the connecting slot 322 is connected to the plug-in slot 321. When connected, the connecting disc buckle 31 is inserted into the plug-in slot 321 of the buckle joint 32, and the wedge-shaped pin 33 is inserted into the connecting disc buckle 31 and the buckle joint 32 from top to bottom through the connecting slot 322 and the connecting hole 311, thereby realizing a detachable connection between the two. The buckle joint 32 is arranged at a certain angle to the annular horizontal rod 211, and the length direction of the buckle joint 32 coincides with the length direction of one of the connecting holes 311 on the connecting disc buckle 31.

[0036] Reference Figure 2 and Figure 4 The trapezoidal pedal 22 is pre-made in multiple sizes with different lengths. Several trapezoidal pedals 22 are laid in parallel in the support frame 21. The trapezoidal pedal 22 and the walking platform 103 are located at the same horizontal height. The length direction of the trapezoidal pedal 22 is parallel to the annular horizontal rod 211, and the sides of the two ends of the length direction of the trapezoidal pedal 22 are parallel to the radial horizontal rod 212. Both ends of the length direction of the trapezoidal pedal 22 are connected with a plurality of lap hooks 5. The vertical plane where the lap hooks 5 are located is perpendicular to the length direction of the radial horizontal rod 212, and the lap hooks 5 are lapped on the radial horizontal rod 212. The bottom surfaces of both ends of the length direction of the trapezoidal pedal 22 are connected with a limit plate 6. The plug-in through hole 61 is opened on the plug-in through hole 61. The plug-in plate 7 is inserted into the plug-in through hole 61. The plug-in plate 7 contacts the bottom end of the radial horizontal rod 212.

[0037] Reference Figure 1A group of support trusses 8 are arranged between the two corresponding outer uprights 102 and the two corresponding inner uprights 101, and the support trusses 8 include reinforcement support rods 81 and transverse support rods 82. Two transverse support rods 82 are arranged horizontally, and a plurality of reinforcement support rods 81 are connected between the two transverse support rods 82. The two ends of the transverse support rods 82 in one group of support trusses 8 correspond to and are connected to the two corresponding outer uprights 102 one by one, and the two ends of the transverse support rods 82 in the other group of support trusses 8 correspond to and are connected to the two corresponding inner uprights 101 one by one. A horizontal railing 9 is connected between the two corresponding inner uprights 101 and the two corresponding outer uprights 102 along the horizontal direction. A support diagonal rod 10 is obliquely connected between the two corresponding inner uprights 101 and the two corresponding outer uprights 102.

[0038] Reference Figure 1 The adjustable base 4 is connected to a group of bottom ends of each inner vertical pole 101 and outer vertical pole 102, and the adjustable base 4 includes an adjusting screw 41, a supporting bottom plate 42 and an adjusting support nut 43. The adjusting screw 41 is vertically fixedly connected to the top surface of the supporting bottom plate 42, and the adjusting support nut 43 is threadedly connected to the adjusting screw 41. The adjusting screw 41 is inserted into the bottom end of the corresponding outer vertical pole 102 or the corresponding inner vertical pole 101, and the adjusting support nut 43 abuts against the bottom end of the outer vertical pole 102 or the inner vertical pole 101.

[0039] Reference Figure 1 and Figure 2 When connecting adjacent rectangular scaffolding units 1, the radial horizontal rods 212 are connected between the corresponding inner vertical rods 101 and the outer vertical rods 102, and the circumferential horizontal rods 211 are connected between the corresponding two inner vertical rods 101 or the two corresponding outer vertical rods 102. The two circumferential horizontal rods 211 and the two radial horizontal rods 212 together form a support frame 21. A plurality of trapezoidal pedals 22 of different lengths are installed at corresponding positions on the support frame 21. The plurality of trapezoidal pedals 22 completely cover the interior of the support frame 21, avoiding the existence of gaps in the support frame 21, which affects the safety of use. Several trapezoidal pedals 22 are kept flush with the walking platform 103, avoiding the formation of height differences on the walkway, and further improving the safety of the scaffolding.

[0040] Reference Figure 2 and Figure 4 The overlapping hooks 5 at both ends of the trapezoidal pedal 22 are overlapped on the corresponding two radial horizontal rods 212, and the plug-in plate 7 is inserted into the plug-in through hole 61 of the limit plate 6. The plug-in plate 7 abuts against the bottom end of the radial horizontal rod 212, thereby reducing the possibility of the trapezoidal pedal 22 falling off the supporting frame 21 during use.

[0041] Reference Figure 1The horizontal railing 9 and the supporting diagonal rod 10 are connected between the corresponding two inner vertical rods 101 or the corresponding two outer vertical rods 102. The setting of the horizontal railing 9 realizes the protection of the operator, and the supporting diagonal rod 10 supports the scaffolding, which increases the overall structural strength. The supporting truss 8 is connected between the corresponding two inner vertical rods 101 and the corresponding two outer vertical rods 102, which further increases the structural strength of the scaffolding and improves the safety and stability of use.

[0042] Reference Figure 2 When the height of the rectangular scaffolding unit 1 needs to be adjusted, the support nut 43 is screwed and adjusted to move in the height direction, thereby adjusting the height of the outer upright 102 and the inner upright 101. The setting of the adjustable base 4 enables two adjacent walking platforms 103 to maintain the same height, thereby avoiding height differences on the walkway.

[0043] Reference Figure 2 and Figure 3 The annular horizontal rod 211 is quickly and detachably connected to the inner vertical rod 101 and the outer vertical rod 102 through the connecting component 3. Since the buckle joint 32 is set at an angle to the annular horizontal rod 211, the connecting groove 322 on the buckle joint 32 can correspond to one of the connecting holes 311 on the connecting disc buckle 31, which facilitates the stable installation of the annular horizontal rod 211.

[0044] The implementation principle of a polygonal scaffolding construction platform for a circular structure in the embodiment of the present application is as follows: when connecting adjacent rectangular scaffolding units 1, two circumferential horizontal rods 211 and two radial horizontal rods 212 together form a support frame 21. A plurality of trapezoidal pedals 22 of different lengths are installed at corresponding positions on the support frame 21, and the plurality of trapezoidal pedals 22 completely cover the interior of the support frame 21. Several trapezoidal pedals 22 are kept flush with the walking platform 103 to avoid the formation of height differences on the walkway. The provision of the horizontal railing 9 realizes the protection of the operator, and the provision of the supporting diagonal rods 10 and the supporting trusses 8 increases the overall structural strength.

[0045] 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 polygonal scaffolding construction platform for a circular structure, characterized by: The invention relates to a rectangular scaffolding unit (1) and a connection assembly (2), wherein a plurality of the rectangular scaffolding units (1) are arranged along the circumferential direction, and two adjacent rectangular scaffolding units (1) are arranged at an angle, wherein the rectangular scaffolding unit (1) comprises a vertical pole group and a walking platform (103), wherein the vertical pole group comprises two vertically arranged outer vertical poles (102) and two inner vertical poles (101), wherein the walking platform (103) has a plurality of vertically connected poles between the inner vertical poles (101) and the outer vertical poles (102), wherein the connection assembly (2) comprises a support frame (21) and a trapezoidal pedal (22), wherein the support frame (21) comprises radial horizontal poles (212) and annular horizontal poles (211), wherein the radial horizontal poles (212) are connected to two adjacent inner vertical poles (101) and the outer vertical poles. The inner upright poles (101) of two adjacent rectangular scaffolding units (1) are mutually adjacent and correspond to each other, and the outer upright poles (102) of two adjacent rectangular scaffolding units (1) are mutually adjacent and correspond to each other. One of the circumferential horizontal poles (211) is connected between the corresponding two inner upright poles (101) and the corresponding two outer upright poles (102). The two circumferential horizontal poles (211) and the two radial horizontal poles (212) are located in the same horizontal plane. A plurality of the trapezoidal pedals (22) are laid in parallel on the support frame (21). The lengths of the plurality of the trapezoidal pedals (22) are different. The trapezoidal pedals (22) are arranged along the length direction of the circumferential horizontal poles (211). The two ends of the trapezoidal pedals (22) are respectively connected to the two radial horizontal poles (212).

2. A polygonal scaffolding construction platform for a circular structure according to claim 1, characterized in that: A support truss (8) is connected between the two corresponding outer vertical rods (102) and the two corresponding inner vertical rods (101), and the support truss (8) includes a transverse support rod (82) and a reinforcing support rod (81). Two transverse support rods (82) are arranged in parallel, and the transverse support rods (82) correspond to and are connected to the two corresponding outer vertical rods (102) and the two corresponding inner vertical rods (101) one by one, respectively. A plurality of reinforcing support rods (81) are connected between the two transverse support rods (82).

3. A polygonal scaffolding construction platform for a circular structure according to claim 1, characterized in that: Both ends of the trapezoidal pedal (22) in the length direction are connected with overlapping hooks (5), and the overlapping hooks (5) are arranged above the corresponding radial horizontal rods (212). The vertical plane where the overlapping hooks (5) are located is perpendicular to the length direction of the radial horizontal rods (212).

4. A polygonal scaffolding construction platform for a circular structure according to claim 3, characterized in that: A limit plate (6) is provided on the bottom surface of both ends of the trapezoidal pedal (22) in the length direction, and a plug-in plate (7) is slidably inserted in the limit plate (6), and the plug-in plate (7) abuts against the bottom end of the radial horizontal rod (212).

5. The polygonal scaffolding construction platform for circular structure according to claim 1, characterized in that: The bottom ends of the inner vertical rod (101) and the outer vertical rod (102) are both provided with an adjustable base (4), and the adjustable base (4) comprises an adjusting screw (41), a supporting base plate (42) and an adjusting support nut (43), the adjusting screw (41) is connected to the top surface of the supporting base plate (42), the adjusting support nut (43) is threadedly connected to the adjusting screw (41), the inner vertical rod (101) and the outer vertical rod (102) are sleeved on the adjusting screw (41), and the adjusting support nut (43) is in contact with the bottom ends of the inner vertical rod (101) and the outer vertical rod (102).

6. The polygonal scaffolding construction platform for circular structure according to claim 1, characterized in that: A horizontal railing (9) is connected between the two corresponding outer upright poles (102) and the two corresponding inner upright poles (101).

7. A polygonal scaffolding construction platform for a circular structure according to claim 6, characterized in that: A supporting diagonal rod (10) is obliquely connected between the two corresponding outer vertical rods (102) and the two corresponding inner vertical rods (101).

8. The polygonal scaffolding construction platform for circular structure according to claim 1, characterized in that: The annular horizontal rod (211) is connected to the outer vertical rod (102) and the inner vertical rod (101) by a connecting assembly (3). The connecting assembly (3) comprises a connecting disc buckle (31), a buckle joint (32) and a wedge-shaped pin (33). One connecting disc buckle (31) is provided on each of the inner vertical rod (101) and the outer vertical rod (102). A plurality of connecting holes (311) are provided on the connecting disc buckle (31) at equal angular intervals along the circumferential direction. One buckle joint (32) is provided at each of the two ends of the annular horizontal rod (211). The buckle joint (32) is away from the annular horizontal rod. One end of the horizontal rod (211) is provided with an insertion groove (321), and the buckle joint (32) is provided with a connecting through groove (322) in the longitudinal direction and communicated with the insertion groove (321), the connecting disc buckle (31) is inserted into the plugging groove (321), the wedge-shaped pin (33) passes through the connecting disc buckle (31) and the buckle joint (32) through the connecting through groove (322) and the connecting hole (311), the buckle joint (32) and the annular horizontal rod (211) are arranged at an angle, and the length direction of the buckle joint (32) coincides with the length direction of one of the connecting holes (311).

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