Spiral cable retractor synchronized with the lifting rod

Abstract

The present invention discloses a spiral cable telescopic mechanism synchronized with a lifting rod, including a cable, the lifting rod having a bottom tube, a plurality of inner tubes and a top tube, the top of the top tube being provided with an antenna mounting plate, and also including a cylindrical mounting frame, the cable being a cylindrical spiral cable, sleeved outside the cylindrical mounting frame, the bottom of the cylindrical mounting frame being provided with an annular support plate, the annular support plate being provided with a pipe hoop, the left and right sides of the cylindrical mounting frame being symmetrically provided with upwardly penetrating mounting channels; a cable passing assembly being provided on the outer wall of the inner tube, and a wire passing component being provided on the antenna mounting plate and the annular support plate respectively; when the lifting rod is in a retracted state, the cable passing assemblies on the adjacent inner tubes are respectively located in the mounting channels on the left and right sides of the cylindrical mounting frame. After the present invention is applied, whether the lifting rod is deployed or retracted, the cables for supplying power to the electrical equipment at the top of the lifting rod can be deployed and dropped back in an orderly manner, and there will be no disorderly accumulation of cables.

Description

Technical Field

[0001] The invention relates to a cable mechanism for supplying power to electrical equipment at the top of a lifting rod, in particular to a spiral cable telescopic mechanism synchronized with the lifting rod. Background Art

[0002] A lifting rod with a certain lifting capacity can be used to quickly erect communication equipment such as antennas. There are many types of lifting rods in the prior art, but the structure mainly includes a tube body and a screw drive device. The tube body includes the innermost top tube, the outermost bottom tube, and multiple inner tubes between the bottom tube and the top tube. When used to erect communication equipment such as antennas, the top of the top tube is equipped with an antenna mounting plate. The screw drive device can be a single screw drive or a multi-screw drive. The multiple inner tubes and top tubes in the tube body can be raised and lowered in sequence or synchronously.

[0003] In the prior art, Chinese invention patent ZL200810229459.3 discloses a "multi-screw mechanical lifting rod". Driven by a screw drive device, a top tube and multiple inner tubes can be raised in sequence to put the lifting rod in an extended state, or lowered in sequence to put the lifting rod in a retracted state.

[0004] In the prior art, CN106241640A discloses a "multi-screw synchronous electric lifting rod", in which a top pipe and a plurality of inner pipes can be synchronously raised to put the lifting rod in an extended state, or synchronously lowered to put the lifting rod in a retracted state under the drive of a screw drive device.

[0005] The lifting rod in the above-mentioned prior art, whether it is the lifting rod itself or the operation of the electrical equipment on the top of the lifting rod, needs to be powered by cables. When the lifting rod is in the extended state, the cables connected to the electrical equipment on the top of the lifting rod are also in the extended state. When the lifting rod is in the retracted state, the cables connected to the electrical equipment on the top of the lifting rod are in a disordered state when they are lowered and returned. Such disordered descent and return of the cables often cause the cables to pile up in disorder. The disordered accumulation of cables not only occupies a large space on the ground, but also often hinders the normal operation or maintenance of the lifting rod by the staff. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a spiral cable telescopic mechanism synchronized with a lifting rod. After the present invention is applied, the cables supplying power to the electrical equipment at the top of the lifting rod can be orderly expanded and retracted when the lifting rod is deployed or retracted, and there will be no disorderly accumulation of cables.

[0007] In order to solve the above technical problems, the spiral cable telescopic mechanism synchronized with the lifting rod of the present invention comprises a cable, the lifting rod has a bottom tube, multiple inner tubes and a top tube, the top of the top tube is equipped with an antenna mounting plate, the spiral cable telescopic mechanism synchronized with the lifting rod also includes a cylindrical mounting frame sleeved on the upper part of the bottom tube of the lifting rod, correspondingly, the cable is a cylindrical spiral cable, the cylindrical spiral cable is sleeved outside the cylindrical mounting frame, the bottom of the cylindrical mounting frame is fixedly equipped with an annular support plate, the annular support plate is fixedly equipped with a pipe clamp for clamping on the upper part of the bottom tube, the cylindrical The left and right sides of the shaped mounting frame are symmetrically provided with upwardly penetrating mounting channels; the outer wall of the top pipe opening of each inner tube is provided with a cable passing assembly extending to the side for the cable of the cylindrical spiral cable to pass through, and the cable passing assemblies on the outer walls of the top pipe openings of adjacent inner tubes are respectively arranged on the left and right sides of the lifting rod, and the antenna mounting plate and the annular supporting plate are respectively provided with wire passing components for the two ends of the cable of the cylindrical spiral cable to pass through; when the lifting rod is in a retracted state, the cable passing assemblies on the adjacent inner tubes are respectively located in the mounting channels on the left and right sides of the cylindrical mounting frame.

[0008] After the lifting rod is applied with the spiral cable telescopic mechanism synchronized with the lifting rod of the present invention, when the lifting rod is in the unfolded state, the inner tubes and the top tube of the lifting rod rise, and the cylindrical spiral cable rises in an orderly manner under the constraint of the corresponding cable passing assembly. When the lifting rod is in the retracted state, the cylindrical spiral cable falls back in an orderly manner and is sleeved outside the cylindrical mounting frame under the constraint of the elastic force of the cylindrical spiral cable itself and the corresponding cable passing assembly, and disorderly accumulation of cables will not occur.

[0009] Furthermore, the wire passing component is composed of a clip that can be fixed on the antenna mounting plate or the annular support plate, and a wire passing sleeve placed in the clip and fixed by the clip for the cable end of the cylindrical spiral cable to pass through, and the clip is equipped with a fixing screw for fixing the clip to the antenna mounting plate or the annular support plate.

[0010] As an improvement of the present invention, the cylindrical mounting frame is in a conical cylindrical shape, and the cylindrical spiral cable sleeved outside the cylindrical mounting frame is a conical cylindrical spiral cable. The specific shapes of the cylindrical mounting frame and the cylindrical spiral cable are both conical cylindrical, which can reduce the friction between the cable and the mounting frame when the lifting rod is deployed and retracted, and is conducive to the smooth deployment and retraction of the cable.

[0011] As a further improvement of the present invention, the conical cylindrical mounting frame includes a plurality of positioning rings with gradually decreasing diameters arranged at intervals from bottom to top and support poles fixed on the outer walls of the plurality of positioning rings at intervals and uniformly distributed, and arc sections are symmetrically cut off on the left and right sides of the other positioning rings except for the one or two positioning rings at the bottom to form the mounting channel. The above-mentioned mounting frame structure adopts a combination of positioning rings and support poles, which can save materials and reduce production costs on the one hand, and can further reduce the friction between the cable and the mounting frame on the other hand, which is more conducive to the deployment and withdrawal of the cable.

[0012] As another improvement of the present invention, the cable passing assembly is composed of a connecting flange shaft fixed on the outer wall of the top end of the inner tube, a connecting plate fixed to one end of the connecting flange shaft, and a wire passing assembly installed at the end of the connecting plate for the cable of the cylindrical spiral cable to pass through.

[0013] Furthermore, the wire passing assembly can be rotatably mounted on the end of the connecting plate.

[0014] Furthermore, the wire passing assembly is composed of a cable clamp and a sleeve fixed to one side of the cable clamp, a rotating shaft is installed in the sleeve, one end of the rotating shaft is fixed to the end of the connecting plate, and the sleeve can rotate around the rotating shaft.

[0015] In the present invention, the wire passing assembly is rotatably mounted on the end of the connecting plate. When the lifting rod is deployed or retracted, the wire passing assembly can be rotated accordingly, which can further adapt to the deployment and retraction of the cylindrical spiral cable.

[0016] As another improvement of the present invention, the cable clamp is formed by buckling an upper and a lower clasping piece, and when the upper and the lower clasping piece are buckled together, a columnar passage is formed therebetween for the cylindrical spiral cable to pass through. The cable clamp adopts a structure formed by buckling an upper and a lower clasping piece, which facilitates the installation of the cylindrical spiral cable in the present invention.

[0017] Furthermore, a circumferential groove is formed on one side of the sleeve close to the upper and lower embracing members, and a circular limiting baffle is fixedly installed at the end of the rotating shaft located in the sleeve and placed in the groove to prevent the rotating shaft from slipping out of the sleeve.

[0018] As another improvement of the present invention, the connecting plate is composed of a first connecting plate and a second connecting plate, the upper part of the first connecting plate is fixed to one end of the connecting flange shaft, and the lower part has a first connecting long hole, the upper part of the second connecting plate has a second connecting long hole matching the first connecting long hole, and the lower part is fixedly connected to the rotating shaft, the lower part of the first connecting plate overlaps with the upper part of the second connecting plate, and the first connecting long hole and the second connecting long hole are fixedly connected by fastening screws.

[0019] The connecting plate in the present invention is composed of a first connecting plate and a second connecting plate connected together, the lower part of the first connecting plate overlaps with the upper part of the second connecting plate, and the first connecting long strip hole and the second connecting long strip hole are fixedly connected by fastening screws. This structure can adjust the height of the wire passing assembly in the cable passing assembly by adjusting the fastening screws, which is convenient for the installation of cables in cylindrical spiral cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the main structural state of the present invention when it is installed on the lifting rod, and the lifting rod in the figure is in a retracted state.

[0022] Figure 2 is from Figure 1 Schematic diagram of the structure of the cable removed from the .

[0023] Figure 3 yes Figure 2 Schematic diagram of the structure when the cable is in the unfolded state.

[0024] Figure 4 After removing the cable Figure 1 A partial view of the .

[0025] Figure 5 It is a schematic diagram of the top view of the cylindrical mounting frame in the present invention.

[0026] Figure 6 is along Figure 5 Schematic diagram of the cross-sectional structure along line AA.

[0027] Figure 7 After removing the cable passing through the component Figure 4 Schematic diagram of the top view structure.

[0028] Figure 8 is along Figure 7 Schematic diagram of the cross-sectional structure along line BB.

[0029] Fig. 9 It is a schematic diagram of the top view of the annular support plate in the present invention.

[0030] Fig.10 yes Fig. 9 A-direction view.

[0031] Fig.11 It is a schematic diagram of the main structure of the pipe clamp in the present invention.

[0032] Fig.12 yes Fig.11 Schematic diagram of the side structure.

[0033] Fig.13 yes Fig.11 Schematic diagram of the top view structure.

[0034] Fig.14 It is a schematic diagram of the main structure of the wire-passing component installed on the antenna mounting plate and the annular support plate in the present invention.

[0035] Fig.15 It is a schematic diagram of the main structure of the clip in the wire-crossing component.

[0036] Fig.16 yes Fig.15 Schematic diagram of the top view structure.

[0037] Fig.17 It is a schematic diagram of the main structure of the wire sleeve in the wire-passing component.

[0038] Fig.18 yes Fig.17 Schematic diagram of the top view structure.

[0039] Fig.19 The present invention is a schematic diagram of the main structure when the cable passing assembly of the present invention is installed on the outer wall of the top end of the inner tube in the lifting rod. In the figure, the cable passing assemblies on the outer walls of the top ends of adjacent inner tubes are arranged on the left and right sides of the lifting rod.

[0040] Fig. 20 It is a schematic diagram of the main structure of the cable passing through component in the present invention.

[0041] Fig.21 yes Fig.19 The B-direction view shows the local structure of the cable passing assembly in the present invention.

[0042] Fig. 22 yes Fig.21 Schematic diagram of the enlarged structure of the middle connecting flange shaft.

[0043] Fig.23 yes Fig. 22 Schematic top view of .

[0044] Fig.24 yes Fig. 20 Schematic diagram of the main structure of the cable clamp in the center line assembly.

[0045] Fig.25 yes Fig.24 Schematic diagram of the right side.

[0046] Fig.26 yes Fig.24 Schematic top view of .

[0047] Fig. 27 is along Fig.26 Schematic cross-sectional view of the CC line.

[0048] Fig.28 yes Fig. 20 Schematic diagram of the main structure of the connecting sleeve in the center line assembly.

[0049] Fig.29 yes Fig.28 Right side view schematic.

[0050] Fig.30 yes Fig. 20 Schematic diagram of the main structure of the baffle in the center line assembly.

[0051] Fig.31 yes Fig.30 Left view schematic.

[0052] Fig.32 yes Fig. 20 Schematic diagram of the main cross-sectional structure of the rotating shaft in the center line assembly.

[0053] Fig.33 yes Fig. 20 Schematic diagram of the main structure of the first connecting plate.

[0054] Fig.34 yes Fig.33 Schematic side view of .

[0055] Fig.35 yes Fig. 20 Schematic diagram of the main structure of the second connecting plate.

[0056] Fig.36 yes Fig.35 Schematic side view of .

[0057] Fig.37 It is a schematic diagram of the main structural state of the present invention when it is installed on a lifting rod, and the lifting rod in the figure is in an unfolded state. DETAILED DESCRIPTION

[0058] See first Figure 1 - Fig.13The spiral cable telescopic mechanism synchronized with the lifting rod of the present invention comprises a cable 200. The lifting rod 100 comprises a bottom tube 101, a plurality of inner tubes 102, 103, 104, 105, 106 and a top tube 107. The top of the top tube is provided with an antenna mounting plate 110. The spiral cable telescopic mechanism synchronized with the lifting rod also comprises a cylindrical mounting frame 300 sleeved on the upper part of the bottom tube of the lifting rod. Correspondingly, the cable 200 is a cylindrical spiral cable. The cylindrical spiral cable 200 is sleeved outside the cylindrical mounting frame. The bottom of the cylindrical mounting frame is fixedly provided with an annular support plate 310. The annular support plate is fixedly provided with a device for clamping the cable on the bottom. The pipe hoop 320 on the upper part of the pipe, the left and right sides of the cylindrical mounting frame are symmetrically provided with installation channels 330 that penetrate upward; the outer wall of the top pipe opening of each inner pipe is provided with a cable passing assembly 400 extending to the side for the cable of the cylindrical spiral cable to pass through, and the cable passing assemblies on the outer walls of the top pipe openings of adjacent inner pipes are respectively arranged on the left and right sides of the lifting rod, and the antenna mounting plate 110 and the annular support plate 310 are respectively provided with wire passing components 120 for the two ends of the cable of the cylindrical spiral cable to pass through; when the lifting rod is in the retracted state, the cable passing assemblies 400 on the adjacent inner pipes are respectively located in the installation channels on the left and right sides of the cylindrical mounting frame. The annular support plate 310 is provided with circular holes 311 spaced apart along the circumferential direction to reduce the production cost of the annular support plate and reduce the weight of the annular support plate. The pipe clamp 320 is composed of left and right pipe clamp clasping parts 321 and 322, which can be clamped on the upper part of the bottom pipe by connecting bolts 323. The bottoms of the left and right pipe clamp clasping parts are respectively connected with semi-annular connecting parts 324, which can be fixed on the annular support plate 310 by screws.

[0059] See also Fig.14 - Fig.18 The wire-passing member 120 is composed of a clip 121 that can be fixed on the antenna mounting plate 110 or the annular support plate 310, and a wire-passing sleeve 122 placed in the clip and fixed by the clip for the cable end of the cylindrical spiral cable to pass through. The clip is provided with a fixing screw 123 for fixing the clip to the antenna mounting plate 110 or the annular support plate 310.

[0060] See also Figure 2 , Figure 5 and Figure 6The cylindrical mounting frame 300 is in the shape of a conical cylinder, and the cylindrical spiral cable 200 sleeved on the cylindrical mounting frame is a conical cylindrical spiral cable. Further, the conical cylindrical mounting frame 300 includes a plurality of positioning rings 301 with gradually decreasing diameters arranged from bottom to top and support uprights 302 evenly spaced and fixed on the outer walls of the plurality of positioning rings. Except for one or two positioning rings at the bottom of the conical cylindrical mounting frame 300, arc sections are symmetrically cut off on the left and right sides of the other positioning rings to form the installation channels 330 on the left and right sides.

[0061] See also Fig.19 - Fig.23 The cable passing assembly 400 is composed of a connecting flange shaft 410 for fixing on the outer wall of the top end of the inner tube, a connecting plate 420 fixed on one end of the connecting flange shaft, and a wire passing assembly 430 installed on the end of the connecting plate for the cable of the cylindrical spiral cable to pass through; the connecting flange shaft 410 is composed of a connecting shaft 411 and a connecting flange 412 installed on one end of the connecting shaft, the connecting plate is installed on the other end of the connecting shaft, and the connecting flange shaft is fixed on the outer wall of the top end of the inner tube through the connecting flange at one end. The wire passing assembly 430 is rotatably installed on the end of the connecting plate. The wire passing assembly 430 is composed of a cable clamp 431 and a shaft sleeve 432 fixed on one side of the cable clamp, the cable of the cylindrical spiral cable can pass through the cable clamp 431, the shaft sleeve is equipped with a rotating shaft 433, one end of the rotating shaft is fixed to the end of the connecting plate 420, and the shaft sleeve 432 can rotate with the rotating shaft 433 as the axis.

[0062] See also Fig.24 - Fig. 27 The cable clamp 431 is composed of upper and lower embracing parts 434 and 435 that are buckled together. The upper and lower embracing parts can be buckled together by fixing screws. When the upper and lower embracing parts are buckled together, a cylindrical channel 436 is formed therebetween for the cylindrical spiral cable to pass through.

[0063] See also Fig. 20 , Fig.24 and 28 - Fig.32 A circumferential groove 437 is formed on one side of the sleeve 432 close to the upper and lower embracing parts 434 and 435, and a circular limit baffle 438 is fixedly installed at the end of the rotating shaft 433 located in the sleeve and placed in the groove 437. After the end of the rotating shaft 433 is equipped with a circular limit baffle matching the radial size of the groove 437, the rotating shaft can be prevented from slipping out of the sleeve.

[0064] See also Fig.33 - Fig.36The connecting plate 420 is composed of a first connecting plate 421 and a second connecting plate 425. The upper part of the first connecting plate 421 is fixed to one end of the connecting flange shaft, and the lower part has a first connecting long hole 422. The upper part of the second connecting plate 425 has a second connecting long hole 426 matching the first connecting long hole, and the lower part is fixedly connected to the rotating shaft 433. The lower part of the first connecting plate 421 overlaps with the upper part of the second connecting plate 425, and the first connecting long hole 422 and the second connecting long hole 426 are fixedly connected by fastening screws 423.

[0065] Last seen Fig.37 , Fig.37 3 is a schematic diagram of the main structural state of the present invention when it is installed on a lifting rod. The lifting rod in the figure is in an unfolded state, and the cable in the present invention is also in an unfolded state accordingly.

[0066] The spiral cable telescopic mechanism synchronized with the lifting rod of the present invention, when being installed, firstly fix the cylindrical mounting frame of the present invention to the upper part of the bottom tube of the lifting rod through the pipe clamp on the bottom annular support plate of the present invention, sleeve the cylindrical spiral cable outside the cylindrical mounting frame, then install the inner tube and the top tube of the lifting rod, assemble the lifting rod as a whole, then install the cable passing components of the present invention on the outer wall of the top pipe opening of each inner tube respectively, so that the cable passing components on the outer walls of the top pipe openings of adjacent inner tubes are respectively arranged on the left and right sides of the lifting rod, when the lifting rod is in a retracted state, the cable passing components on the adjacent inner tubes are respectively located in the installation channels on the left and right sides of the cylindrical mounting frame, then install the wire passing components of the present invention on the antenna mounting plate and the annular support plate, finally pass the cables of the cylindrical spiral cable through each cable passing component respectively, and the two ends of the cable pass through the wire passing components on the antenna mounting plate and the annular support plate respectively, the cable passing through the wire passing components on the antenna mounting plate is connected to the electrical equipment at the top of the lifting rod, and the cable passing through the wire passing components on the annular support plate is connected to the power supply.

Claims

1. A spiral cable telescopic mechanism synchronized with a lifting rod, comprising a cable (200), wherein the lifting rod (100) comprises a bottom tube (101), a plurality of inner tubes and a top tube (107), wherein an antenna mounting plate (110) is mounted on the top of the top tube, wherein: The spiral cable telescopic mechanism synchronized with the lifting rod also includes a cylindrical mounting frame (300) sleeved on the upper part of the bottom tube of the lifting rod. Correspondingly, the cable (200) is a cylindrical spiral cable. The cylindrical spiral cable (200) is sleeved outside the cylindrical mounting frame. An annular support plate (310) is fixedly installed at the bottom of the cylindrical mounting frame. A pipe clamp (320) for clamping the upper part of the bottom tube is fixedly installed on the annular support plate. The left and right sides of the cylindrical mounting frame are symmetrically provided with upwardly penetrating mounting channels (330); each inner tube top A cable passing assembly (400) extending toward one side for the cylindrical spiral cable to pass through is mounted on the outer wall of the end pipe opening, and the cable passing assemblies on the outer walls of the top pipe openings of adjacent inner pipes are disposed on the left and right sides of the lifting rod, and the antenna mounting plate (110) and the annular support plate (310) are respectively mounted with wire passing components (120) for the two ends of the cylindrical spiral cable to pass through; when the lifting rod is in a retracted state, the cable passing assemblies (400) on the adjacent inner pipes are respectively located in the mounting channels on the left and right sides of the cylindrical mounting frame.

2. The spiral cable telescopic mechanism synchronized with the lifting rod as claimed in claim 1, characterized in that: The wire-passing member (120) is composed of a clip (121) that can be fixed on the antenna mounting plate (110) or the annular support plate (310), and a wire-passing sleeve (122) that is placed in the clip and fixed by the clip and allows the cylindrical spiral cable end to pass through. The clip is provided with a fixing screw (123) for fixing the clip to the antenna mounting plate (110) or the annular support plate (310).

3. The spiral cable telescopic mechanism synchronized with the lifting rod as claimed in claim 1 or 2, characterized in that: The cylindrical mounting frame (300) is in the shape of a conical cylinder, and the cylindrical spiral cable (200) sleeved outside the cylindrical mounting frame is a conical cylindrical spiral cable accordingly.

4. The spiral cable telescopic mechanism synchronized with the lifting rod as claimed in claim 3, characterized in that: The conical cylindrical mounting frame (300) comprises a plurality of positioning rings (301) with gradually decreasing diameters and arranged at intervals from bottom to top, and support uprights (302) evenly spaced and fixed on the outer walls of the plurality of positioning rings. Except for one or two positioning rings at the bottom, arc sections are symmetrically cut off on the left and right sides of the other positioning rings to form the mounting channel (330).

5. The spiral cable telescopic mechanism synchronized with the lifting rod as claimed in claim 1, characterized in that: The cable passing assembly (400) is composed of a connecting flange shaft (410) fixed on the outer wall of the top end of the inner tube, a connecting plate (420) fixed to one end of the connecting flange shaft, and a wire passing assembly (430) installed at the end of the connecting plate for the cylindrical spiral cable to pass through.

6. The spiral cable telescopic mechanism synchronized with the lifting rod as claimed in claim 5, characterized in that: The wire passing assembly (430) is rotatably mounted on the end of the connecting plate.

7. The spiral cable telescopic mechanism synchronized with the lifting rod as claimed in claim 6, characterized in that: The wire passing assembly (430) is composed of a cable clamp (431) and a shaft sleeve (432) fixed to one side of the cable clamp, a rotating shaft (433) is installed in the shaft sleeve, one end of the rotating shaft is fixed to the end of the connecting plate (420), and the shaft sleeve (432) can rotate around the rotating shaft (433).

8. The spiral cable telescopic mechanism synchronized with the lifting rod as claimed in claim 7, characterized in that: The cable clamp (431) is composed of an upper clasping piece (434) and a lower clasping piece (435) which are buckled together. When the upper clasping piece and the lower clasping piece (435) are buckled together, a columnar passage (436) is formed therebetween for the cylindrical spiral cable to pass through.

9. The spiral cable telescopic mechanism synchronized with the lifting rod as claimed in claim 8, characterized in that: A circumferential groove (437) is formed on one side of the shaft sleeve (432) close to the upper clasping piece (434) and the lower clasping piece (435), and a circular limiting baffle (438) is fixedly mounted at the end of the rotating shaft (433) in the shaft sleeve and is placed in the groove (437) to prevent the rotating shaft from slipping out of the shaft sleeve.

10. The spiral cable telescopic mechanism synchronized with the lifting rod as claimed in claim 9, characterized in that: The connecting plate (420) is composed of a first connecting plate (421) and a second connecting plate (425) connected together, the upper part of the first connecting plate (421) is fixed to one end of the connecting flange shaft, the lower part of the first connecting plate (421) has a first connecting long hole (422), the upper part of the second connecting plate (425) has a second connecting long hole (426) matching the first connecting long hole, the lower part of the second connecting plate (425) is fixedly connected to the rotating shaft (433), the lower part of the first connecting plate (421) overlaps with the upper part of the second connecting plate (425), and the first connecting long hole (422) and the second connecting long hole (426) are fixedly connected by a fastening screw (423).

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