Safety type lifting platform for building construction

Abstract

The application is a safe lifting platform for building construction, belonging to the field of construction equipment, comprising a bottom shell, a lifting lifting device arranged inside the bottom shell, a first working platform installed on the top of the lifting lifting device, a first anti-falling device arranged on the surface of the first working platform, a mounting positioning stud fixedly installed on the bottom inner wall of the bottom shell, a positioning support rod threadedly installed on the top of the mounting positioning stud, the positioning support rod penetrating through the first anti-falling device and extending above the first working platform, and the first anti-falling device being sleeved on the outer side of the positioning support rod. The safe lifting platform for building construction controls the first working platform to lift through the lifting lifting device, and the positioning support rods arranged at four corners of the first working platform are used to assist in limiting the four corners of the first working platform, so as to reduce the horizontal shaking of the first working platform and improve the safety during construction.

Description

Technical Field

[0001] This invention relates to a safe lifting platform for building construction, and pertains to the field of engineering construction technology. Background Technology

[0002] During construction, lifting platforms are often used to work on walls at higher elevations. Lifting platforms are multi-functional lifting and unloading machinery. During the lifting process, the lifting is controlled by hydraulic columns. A typical lifting platform only has one working platform, which results in a small effective working area during construction. It is necessary to repeatedly control the moving and lifting of the working platform to adapt to different heights and locations of the higher walls. Furthermore, the stability of the lifting platform after it is raised is poor, and it does not have an anti-tilt function, which can easily lead to accidents.

[0003] The invention patent with application number CN202210865382.9 provides an auxiliary lifting platform for construction, including a base, a first fixed seat, a first gas rod, a lifting frame, and a top plate. The first fixed seat is located at the bottom inner side of the base, and the first gas rod is located on the upper side of the first fixed seat. By rotating the third protective frame outward, it is convenient for workers to place construction materials on the top plate. When the top plate moves downward, it will drive the rack to move downward, thereby driving the staircase to rotate 90 degrees. Workers can climb the staircase to the top plate conveniently and quickly.

[0004] However, in actual use, the platform's lifting stability is poor. It is supported only by the lifting frame, which makes it prone to horizontal swaying. The single support method means that if the lifting frame of the lifting platform is damaged, the upper lifting platform will tilt and fall directly, posing a safety hazard. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a safe lifting platform for construction, so as to solve the problems mentioned in the background art.

[0006] The present invention is achieved through the following technical solution: a safety lifting platform for construction, comprising a bottom shell, a lifting device disposed inside the bottom shell, a first working platform mounted on the top of the lifting device, a first anti-fall device disposed on the surface of the first working platform, a mounting positioning stud fixedly mounted on the bottom inner wall of the bottom shell, a positioning support rod threadedly mounted on the top of the mounting positioning stud, the positioning support rod passing through the inside of the first anti-fall device and extending above the first working platform, the first anti-fall device being sleeved on the outside of the positioning support rod; The bottom of the base is fixedly equipped with casters, and a hydraulic support column is fixedly installed at the bottom of the base and outside the casters. A support plate is fixedly installed at the bottom end of the hydraulic support column.

[0007] Preferably, a support cylinder is sleeved above the first fall arrestor, a second fall arrestor is installed at the bottom of the second working platform, the bottom end of the second fall arrestor is connected to the support cylinder, and screw holes are opened at the top of both the first and second working platforms.

[0008] Preferably, a climbing frame is fixedly installed on the outer wall of the support tube frame, the top of the support tube frame is threadedly connected to the second fall protection device, the bottom of the support tube frame is threadedly connected to the first fall protection device, and the positioning support rod passes through the inside of the support tube frame.

[0009] Preferably, the bottom end of the positioning support rod is provided with a screw hole, and the positioning stud is connected to the bottom end of the positioning support rod by threads. The top end of the positioning support rod is provided with a stud head, and the upper and lower positioning support rods are assembled and connected by the mating of the stud head and the screw hole.

[0010] Preferably, the lifting device includes an X-shaped lifting frame, a limiting support rail, a drive linkage, and a hydraulic cylinder. The limiting support rail is fixedly installed to the bottom inner wall of the base shell via a bracket. The left bottom end of the X-shaped lifting frame is engaged inside the limiting support rail, and the right bottom end of the X-shaped lifting frame is engaged inside the limiting support rail.

[0011] Preferably, the lifting device further includes a telescopic cylinder, a telescopic column, and a piston disc. The surface of the telescopic cylinder is rotatably installed on the rear side wall of the X-shaped lifting frame through the cooperation of a support rod and a bearing. The bottom end of the telescopic column is inserted into the inside of the telescopic cylinder. The piston disc is fixedly installed on the bottom end of the telescopic column and is movably engaged inside the telescopic cylinder. A buffer pressure relief hole is opened on the surface of the piston disc. The inside of the telescopic cylinder is filled with buffer pressure relief oil. The top end of the telescopic column is rotatably installed on the surface of the upper X-shaped lifting frame through a connecting rod and a bearing.

[0012] Preferably, the second fall arrestor includes a positioning ball, a positioning cylinder seat, a locking cylinder, an outer fall arresting ring, and an inner fall arresting ring. The positioning ball is embedded in the surface of the second working platform, the positioning support rod passes through the inside of the positioning ball, the positioning cylinder seat is fixedly installed to the bottom of the second working platform, the locking cylinder is threaded onto the inner side of the positioning cylinder seat, the outer fall arresting ring is fixedly installed to the inner wall of the locking cylinder, and the inner fall arresting ring is fixedly installed to the outer wall of the positioning support rod.

[0013] Preferably, the outer diameter of the inner anti-fall ring is smaller than the inner diameter of the positioning ball and the inner diameter of the outer anti-fall ring.

[0014] Preferably, the bottom surface of the outer fall arrestor ring is provided with a snap-fit ​​cone, and the top surface of the inner fall arrestor ring is provided with a snap-fit ​​ring. The structural principles of the first fall arrestor and the second fall arrestor are the same.

[0015] Compared with the prior art, the present invention has the following advantages: 1. This construction safety lifting platform controls the lifting of the first working platform through a lifting device, and uses positioning support rods at the four corners to assist in limiting the horizontal sway of the first working platform, thereby reducing the horizontal sway of the first working platform and improving safety during construction.

[0016] This construction safety lifting platform, through the cooperation of the first and second working platforms, can simultaneously achieve two construction platform heights, thereby increasing the height area that can be covered during construction and improving its applicability. It eliminates the need for frequent adjustments to the lifting height, making it easy to use.

[0017] This construction safety lifting platform features an X-shaped lifting frame that folds and retracts under pressure when the hydraulic cylinder malfunctions and fails to provide support. Through the cooperation of the telescopic cylinder, telescopic column, and piston disc, the speed at which the X-shaped lifting frame descends and folds is reduced, thus preventing a rapid fall that could cause danger.

[0018] This construction safety lifting platform, when the first and second working platforms tilt, uses the cooperation of the first and second anti-fall devices to engage with the positioning support rod, thereby preventing the first and second working platforms from continuing to tilt, improving the stability of the support, and preventing construction workers from being unable to stand stably on the platforms due to tilting, thus improving construction safety. Attached Figure Description

[0019] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the bottom structure of the present invention; Figure 3 This is a schematic diagram of the internal cross-sectional structure of the present invention; Figure 4 For the present invention Figure 3 Enlarged view of the structure at point A in the middle; Figure 5 This is a cross-sectional view of the second fall protection device of the present invention; Figure 6 For the present invention Figure 5 Enlarged view of the structure at point B in the middle; Figure 7 This is a schematic diagram of the inner structure of the X-shaped lifting frame of the present invention; Figure 8 This is a schematic diagram of the internal cross-sectional structure of the telescopic cylinder of the present invention; The components include: 1. Base shell; 21. Casters; 22. Hydraulic support column; 3. Lifting and raising device; 31. X-shaped lifting frame; 32. Limiting support rail; 33. Drive linkage; 34. Hydraulic cylinder; 35. Telescopic cylinder; 36. Telescopic column; 37. Piston disc; 4. First working platform; 5. First anti-fall device; 6. Support cylinder frame; 61. Climbing frame; 7. Second working platform; 8. Second anti-fall device; 81. Positioning ball; 82. Positioning cylinder seat; 83. Clip-on cylinder; 84. Outer anti-fall ring; 85. Inner anti-fall ring; 9. Positioning support rod; 91. Installation positioning stud. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] Please see Figures 1-8 This invention provides a technical solution: a safety lifting platform for construction, including a base shell 1. A lifting device 3 is installed inside the base shell 1. A first working platform 4 is installed on the top of the lifting device 3. The lifting device 3 supports the first working platform 4 for upward lifting. A first anti-fall device 5 is installed on the surface of the first working platform 4. A positioning stud 91 is fixedly installed on the bottom inner wall of the base shell 1. A positioning support rod 9 is threaded onto the top of the positioning stud 91. The positioning support rod 9 passes through the inside of the first anti-fall device 5 and extends above the first working platform 4. The cooperation between the first anti-fall device 5 and the positioning support rod 9 improves the stability of the first working platform 4 and prevents it from tilting. The first anti-fall device 5 is sleeved on the outside of the positioning support rod 9. When the first working platform 4 tilts and falls, the first anti-fall device 5 and the positioning support rod 9 will engage, thereby preventing the first working platform 4 from tilting and falling. The tilted first working platform 4 will cause the first anti-fall device 5 to engage with the positioning support rod 9.

[0023] In this embodiment, a movable wheel 21 is fixedly installed on the bottom of the bottom shell 1, and a hydraulic support column 22 is fixedly installed on the bottom of the bottom shell 1 at a position outside the movable wheel 21. A support plate is fixedly installed at the bottom end of the hydraulic support column 22.

[0024] Specifically, the lifting platform can be moved by the support of the moving wheels 21. When the lifting support is used, the hydraulic support column 22 is extended and pushed to make contact with the ground, thereby increasing the contact area between the lifting platform and the ground support and improving the stability of the support.

[0025] In this embodiment, a support frame 6 is sleeved above the first fall arrestor 5, and a second fall arrestor 8 is installed at the bottom of the second working platform 7. The bottom end of the second fall arrestor 8 is connected to the support frame 6. The second working platform 7 is supported by the cooperation of the support frame 6 and the second fall arrestor 8. The top of both the first working platform 4 and the second working platform 7 is provided with screw holes, through which side railings can be installed.

[0026] Specifically, the first fall arrestor 5 and the support frame 6 are connected by the support frame 6, which enables the support of the second fall arrestor 8 and the second working platform 7. This allows the first working platform 4 and the second working platform 7 to work together to achieve the goal of simultaneous construction on two working platforms, thereby increasing the height coverage.

[0027] In this embodiment, a climbing frame 61 is fixedly installed on the outer wall of the support tube frame 6, the top of the support tube frame 6 is threadedly connected to the second fall protection device 8, the bottom of the support tube frame 6 is threadedly connected to the first fall protection device 5, and the positioning support rod 9 passes through the inside of the support tube frame 6.

[0028] Specifically, by setting up the climbing frame 61, it is convenient to hoist and move the support cylinder 6, and at the same time, it is convenient to climb along the outside of the support cylinder 6 to the top of the second working platform 7 for construction.

[0029] In this embodiment, a screw hole is provided at the bottom end of the positioning support rod 9, and the mounting positioning stud 91 is connected to the bottom end of the positioning support rod 9 by threads. A stud head is provided at the top end of the positioning support rod 9, and the upper and lower positioning support rods 9 are assembled and connected by the mating of the stud head and the screw hole.

[0030] Specifically, the system is assembled using bolt connections, allowing for the installation of positioning support rods 9 at different heights as needed. Furthermore, when used at lower heights, side support can be provided without the need for the positioning support rods 9, thus improving usability in low-altitude conditions.

[0031] In this embodiment, the lifting device 3 includes an X-shaped lifting frame 31, a limiting support rail 32, a drive link 33, and a hydraulic cylinder 34. The limiting support rail 32 is fixedly installed on the bottom inner wall of the bottom shell 1 through a bracket. The left bottom end of the X-shaped lifting frame 31 is engaged inside the limiting support rail 32, and the right bottom end of the X-shaped lifting frame 31 is engaged inside the limiting support rail 32.

[0032] Specifically, the top left side of the X-shaped lifting frame 31 is connected to the bottom of the first working platform 4 via a limiting support rail 32, and the top right side of the X-shaped lifting frame 31 is hinged to the bottom of the first working platform 4 via a hinge seat. The hydraulic cylinder 34 pushes the drive link 33 to move laterally, and the drive link 33 pushes the bottom of the X-shaped lifting frame 31 closer to each other, thereby pushing the X-shaped lifting frame 31 upward to perform support work.

[0033] In this embodiment, the lifting device 3 further includes a telescopic cylinder 35, a telescopic column 36, and a piston disc 37. The surface of the telescopic cylinder 35 is rotatably mounted to the rear side wall of the X-shaped lifting frame 31 through the cooperation of a support rod and a bearing. The bottom end of the telescopic column 36 is inserted into the interior of the telescopic cylinder 35. The piston disc 37 is fixedly mounted to the bottom end of the telescopic column 36. The piston disc 37 is movably engaged inside the telescopic cylinder 35. A buffer pressure relief hole is provided on the surface of the piston disc 37. The interior of the telescopic cylinder 35 is filled with buffer pressure oil. The top end of the telescopic column 36 is rotatably mounted to the surface of the upper X-shaped lifting frame 31 through a connecting rod and a bearing.

[0034] Specifically, when the telescopic column 36 pushes the piston disc 37 to move up and down along the inside of the telescopic cylinder 35, the piston disc 37 will squeeze the hydraulic oil inside the telescopic cylinder 35. The hydraulic oil flows through the pressure relief hole on the surface of the piston disc 37 at a slower speed, thereby slowing down the movement and extension of the piston disc 37 and the telescopic column 36, thus achieving a buffering effect.

[0035] In this embodiment, the second anti-fall device 8 includes a positioning ball 81, a positioning cylinder seat 82, a locking cylinder 83, an outer anti-fall ring 84, and an inner anti-fall ring 85. The positioning ball 81 is embedded in the surface of the second working platform 7, and the positioning support rod 9 passes through the inside of the positioning ball 81. The positioning cylinder seat 82 is fixedly installed to the bottom of the second working platform 7. The locking cylinder 83 is installed inside the positioning cylinder seat 82 by threads. The outer anti-fall ring 84 is fixedly installed to the inner wall of the locking cylinder 83, and the inner anti-fall ring 85 is fixedly installed to the outer wall of the positioning support rod 9.

[0036] Specifically, when the second working platform 7 tilts, it causes the positioning cylinder seat 82 and the locking cylinder 83 to tilt as well. At this time, the positioning support rod 9 remains vertical. The positioning support rod 9 and the inner anti-fall ring 85 provide support to the inner side of the outer anti-fall ring 84, thereby preventing the outer anti-fall ring 84 from deflecting. The outer anti-fall ring 84 prevents the locking cylinder 83, the positioning cylinder seat 82, and the second working platform 7 from continuing to tilt, thus achieving the function of preventing tilting. When the second working platform 7 tilts and then falls, the outer anti-fall ring 84 will deflect slightly and get stuck in the gap between the adjacent inner anti-fall rings 85, thus preventing the outer anti-fall ring 84 from moving further down, thus achieving the function of preventing falling.

[0037] In this embodiment, the outer diameter of the inner anti-fall ring 85 is smaller than the inner diameter of the positioning ball 81 and the inner diameter of the outer anti-fall ring 84.

[0038] Specifically, this allows the inner anti-fall ring 85 to move up and down along the inner sides of the positioning ball 81 and the outer anti-fall ring 84.

[0039] In this embodiment, the bottom surface of the outer fall arresting ring 84 is provided with a snap-fit ​​cone, and the top surface of the inner fall arresting ring 85 is provided with a snap-fit ​​ring. The first fall arresting device 5 and the second fall arresting device 8 have the same structural principle.

[0040] Specifically, when the bottom of the outer fall arresting ring 84 is engaged above the inner fall arresting ring 85, the engaging cone engages inside the engaging ring, improving the stability of the engagement, preventing slippage, and thus preventing a fall.

[0041] During lifting operations: After moving the lifting platform to the work area, control the hydraulic support column 22 to extend and support the ground. Then, install the positioning support rod 9 and the mounting positioning stud 91. As needed for the required lifting height, multiple positioning support rods 9 are spliced ​​together. When a double-layer lifting platform is required, the support cylinder 6 is fitted over the outside of the positioning support rod 9, and the second working platform 7 and the second anti-fall device 8 are secured to the outside of the positioning support rod 9. The second anti-fall device 8 presses down on top of the support cylinder 6, and the support cylinder 6 presses down on top of the first anti-fall device 5. Then, rotate the support cylinder 6, which is connected and fixed to the first anti-fall device 5 and the second anti-fall device 8 via threads. Then, control the hydraulic cylinder 34 to extend, and the hydraulic cylinder 34 pushes the drive linkage 33 to move to the right. The drive linkage 33 drives the left bottom end of the X-shaped lifting frame 31 to move to the right along the limiting support rail 32. The right bottom end of the X-shaped lifting frame 31 approaches the left bottom end, and the upper end of the X-shaped lifting frame 31 is lifted upward. During the lifting process, the X-shaped lifting frame 31 will pull the telescopic cylinder 35 and telescopic column 36 to extend. The X-shaped lifting frame 31 pushes the first working platform 4 upward. The first working platform 4, through the cooperation of the first anti-fall device 5, the support cylinder frame 6 and the second anti-fall device 8, pushes the second working platform 7 to move upward synchronously, thereby achieving the purpose of raising the working platform. During the lifting process, the four positioning support rods 9 are locked in the four directions of the first working platform 4 and the second working platform 7 to provide auxiliary support, so that the first working platform 4 and the second working platform 7 remain horizontal.

[0042] When the hydraulic cylinder 34 malfunctions: When the X-shaped lifting frame 31 no longer receives the lifting thrust from the bottom, the X-shaped lifting frame 31 will be pressed downwards by the first anti-fall device 5, the support cylinder 6, the second anti-fall device 8, and the second working platform 7 above. Under the pressure, the X-shaped lifting frame 31 retracts and folds downwards. During the downward folding process, the X-shaped lifting frame 31 will be squeezed between the telescopic cylinder 35 and the telescopic column 36. During the squeezing process, the telescopic column 36 presses the piston disc 37 and moves downwards along the inside of the telescopic cylinder 35. When the piston disc 37 presses down, it will press the hydraulic oil inside the telescopic cylinder 35, thereby providing buffer support for the piston disc 37 through the hydraulic oil. Under the pressure, the hydraulic oil flows through the pressure relief hole to the top of the piston disc 37, and slowly relieves pressure by flowing upwards. This achieves the purpose of controlling the piston disc 37 and the telescopic column 36 to slowly move downwards along the inside of the telescopic cylinder 35, preventing sudden falls and improving safety.

[0043] When the first working platform 4 and the second working platform 7 tilt: the second working platform 7 causes the second fall arrest device 8 to tilt, the first working platform 4 causes the first fall arrest device 5 to tilt, and the second working platform 7 causes the outer fall arrest ring 84 to tilt through the positioning cylinder seat 82 and the locking cylinder 83. After tilting, the outer fall arrest ring 84 will lock into the gap between the adjacent inner fall arrest rings 85. Subsequently, when the second working platform 7 causes the second fall arrest device 8 to fall, the convex cone at the bottom of the outer fall arrest ring 84 will lock into the convex ring at the top of the inner fall arrest ring 85. The inner side of the outer anti-fall ring 84 is protected to prevent it from falling further. The outer anti-fall ring 84 supports the second working platform 7 through the locking cylinder 83 and the positioning cylinder seat 82, thereby preventing the second working platform 7 from falling. At the same time, the first anti-fall device 5 will also lock with the inner anti-fall ring 85 on the outside of the positioning support rod 9. The second working platform 7 and the first working platform 4 are connected by the support cylinder frame 6 to form a whole. When either the second anti-fall device 8 or the first anti-fall device 5 is locked, it can prevent falling and improve the safety of use.

[0044] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A safety lifting platform for construction, characterized in that: The device includes a bottom shell, inside which a lifting device is installed. A first working platform is installed on the top of the lifting device. A first anti-fall device is installed on the surface of the first working platform. A mounting and positioning stud is fixedly installed on the bottom inner wall of the bottom shell. A positioning support rod is threadedly installed on the top of the mounting and positioning stud. The positioning support rod passes through the inside of the first anti-fall device and extends to the top of the first working platform. The first anti-fall device is sleeved on the outside of the positioning support rod. The bottom of the base is fixedly equipped with casters, and a hydraulic support column is fixedly installed at the bottom of the base and outside the casters. A support plate is fixedly installed at the bottom end of the hydraulic support column.

2. The safety lifting platform for construction as described in claim 1, characterized in that: A support cylinder is fitted above the first fall arrestor, and a second fall arrestor is installed at the bottom of the second working platform. The bottom end of the second fall arrestor is connected to the support cylinder. Screw holes are opened on the top of both the first and second working platforms.

3. The safety lifting platform for construction as described in claim 2, characterized in that: A climbing frame is fixedly installed on the outer wall of the support tube frame. The top of the support tube frame is threadedly connected to the second fall protection device, and the bottom of the support tube frame is threadedly connected to the first fall protection device. The positioning support rod passes through the inside of the support tube frame.

4. A safety lifting platform for construction work according to claim 3, characterized in that: The bottom end of the positioning support rod has a screw hole, and the positioning stud is connected to the bottom end of the positioning support rod by thread. The top end of the positioning support rod has a stud head, and the upper and lower positioning support rods are assembled and connected by the mating of the stud head and the screw hole.

5. A safety lifting platform for construction work according to claim 4, characterized in that: The lifting device includes an X-shaped lifting frame, a limit support rail, a drive linkage, and a hydraulic cylinder. The limit support rail is fixedly installed to the bottom inner wall of the base shell through a bracket. The left bottom end of the X-shaped lifting frame is engaged inside the limit support rail, and the right bottom end of the X-shaped lifting frame is engaged inside the limit support rail.

6. A safety lifting platform for construction work according to claim 5, characterized in that: The lifting and hoisting device also includes a telescopic cylinder, a telescopic column, and a piston disc. The surface of the telescopic cylinder is rotatably installed on the rear side wall of the X-shaped lifting frame through the cooperation of the support rod and bearing. The bottom end of the telescopic column is inserted into the inside of the telescopic cylinder. The piston disc is fixedly installed on the bottom end of the telescopic column and is movably engaged inside the telescopic cylinder. The surface of the piston disc is provided with a buffer pressure relief hole. The inside of the telescopic cylinder is filled with buffer pressure oil. The top end of the telescopic column is rotatably installed on the surface of the upper X-shaped lifting frame through the rotatable cooperation of the connecting rod and bearing.

7. A safety lifting platform for construction work according to claim 6, characterized in that: The second fall protection device includes a positioning ball, a positioning cylinder seat, a locking cylinder, an outer fall protection ring, and an inner fall protection ring. The positioning ball is embedded in the surface of the second working platform, and the positioning support rod passes through the inside of the positioning ball. The positioning cylinder seat is fixedly installed to the bottom of the second working platform. The locking cylinder is installed inside the positioning cylinder seat by threads. The outer fall protection ring is fixedly installed to the inner wall of the locking cylinder, and the inner fall protection ring is fixedly installed to the outer wall of the positioning support rod.

8. A safety lifting platform for construction work according to claim 7, characterized in that: The outer diameter of the inner anti-fall ring is smaller than the inner diameter of the positioning ball and the inner diameter of the outer anti-fall ring.

9. A safety lifting platform for construction work according to claim 8, characterized in that: The bottom surface of the outer fall arrestor ring is provided with a snap-fit ​​cone, and the top surface of the inner fall arrestor ring is provided with a snap-fit ​​ring. The structural principles of the first fall arrestor and the second fall arrestor are the same.

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