Aerial work anti-falling device

Abstract

The utility model discloses a kind of aerial work anti-falling devices, comprising: telescopic operating rod, further comprising: hook assembly, anti-off safety buckle is hingedly arranged on it, and another end extended with pull rope is connected to safety buckle, hook assembly is fixedly installed at the top end of operating rod;Anti-falling rope, one end is detachably connected with hook assembly;Anti-falling device, it is slidably connected on anti-falling rope, and anti-falling device is connected with the safety belt of operating personnel.The utility model passes through a kind of aerial work anti-falling device, solves the problem that existing anti-falling device has no locking structure.

Description

Technical Field

[0001] This utility model relates to the field of inspection and maintenance technology, specifically a fall protection device for high-altitude operations. Background Technology

[0002] In the rail transit sector, high-altitude operations typically involve working at heights between 4 and 8 meters. This mainly involves climbing overhead contact lines, supports, and other cables or pillars. These are usually achieved using ladders or insulated ladders, but these ladders lack fall protection due to their inherent characteristics. Workers typically only wear safety ropes and helmets when climbing. Furthermore, when climbing supports or pillars, workers must hold onto the structure with both hands, leaving almost no free hands to attach safety harnesses. There are also risks of not being able to attach the safety rope in time, having nowhere to attach it, or falling while changing suspension points. All of these factors pose safety hazards to workers.

[0003] Existing technologies, such as application number CN201910774517.9, have introduced hooks of a certain length to replace the traditional method of operators frequently fastening safety belts during climbing. These hooks are suitable for fall protection devices used when climbing 10kV power towers. However, the device has a drawback: the metal hook is open and lacks a locking structure, relying solely on the hook's own curved surface and friction for fixation. During climbing, if the worker's body sways or external factors (such as wind) cause the hook to easily slip off the opening, directly leading to the failure of the fall protection device and causing a fall from height accident. Utility Model Content

[0004] One object of this invention is to solve at least the aforementioned problems and / or defects, and to provide at least the advantages described below.

[0005] To achieve these objectives and other advantages of the present invention, a high-altitude work fall protection device is provided, comprising: a telescopic operating rod, and a hook assembly having an anti-detachment safety buckle hinged thereon, and the other end of the safety buckle being connected to a pull rope, the hook assembly being fixedly installed on the top of the operating rod; The fall arresting rope has one end detachably connected to the hook assembly; The fall arrestor is slidably connected to the fall arrestor rope and is also connected to the operator's safety belt.

[0006] Preferably, the operating lever is composed of multiple sections of rods with unequal or equal diameters connected together.

[0007] Preferably, the lower end of the pull rope is provided with a connecting ring, and the connecting ring is sleeved on the operating rod.

[0008] Preferably, the fall arrest rope and the hook assembly are detachably connected in the following manner: the bottom of the hook assembly is provided with a reinforcing plate with mounting holes, and the fall arrest rope is provided with a shackle, so that the fall arrest rope can be detachably connected to the mounting holes through the shackle.

[0009] Preferably, the hook assembly has the following structure: The main body of the hook is made by bending a solid round rod, and the top of the main body of the hook is a large R-shaped arc. The main body of the hook is fixedly installed to the side of the reinforcing plate. The safety buckle is V-shaped and is mounted on the reinforcing plate via a rotating shaft. The middle section of the safety buckle has a notch for the hook body to rotate. A double torsion spring, wherein the first spring body and the second spring body are sleeved on both sides of the rotating shaft, and the first spring body and the second spring body are connected by a U-shaped connecting part. The U-shaped connecting part is close to the reinforcing plate. The first mounting foot extending from the other end of the first spring body is located on the right half of the V-shape, and the second mounting foot extending from the other end of the second spring body is located on the right half of the V-shape. The reinforcing component is installed on the left half of the V-shape, and a hanging rope mounting shaft is screwed between the reinforcing component and the left half of the V-shape.

[0010] Preferably, the front end of the safety buckle is provided with a semi-circular notch that matches the size of the hook body.

[0011] Preferably, the structure of the hook assembly can also be replaced with: The multi-folded outer shell has a magnet plate on the inner surface of the notch and a rotating groove on the back. The inner surfaces of both sides of the outer shell have arc-shaped sliding grooves, and a rotating shaft is installed inside the outer shell. The safety buckle is V-shaped, and the corner of the V-shaped structure is hinged to the rotating shaft. The right half of the V-shape of the safety buckle matches the notch, and the top is provided with a magnetic piece that attracts the magnetic piece. The left half of the V-shape of the safety buckle extends from the rotating groove, and the tail end is connected to a pull rope. The spring assembly has one end connected to the inner surface of the right half of the V-shape and the other end connected to the outer shell, and there are three sets of springs arranged linearly in the transverse direction. The guide post assembly is fixedly mounted on the housing, and the spring assembly is sleeved on the guide post assembly; The semi-circular slider is symmetrically arranged on both sides of the right half of the V-shape, and the semi-circular slider is slidably connected in the arc-shaped groove.

[0012] This utility model has at least the following beneficial effects: This device increases the height of the safety hook during operator climbing through a hook assembly, and the hinged safety buckle and rope allow for the opening and closing of the hook assembly, ensuring a stable connection between the hook assembly and the fixed object. This effectively improves climbing efficiency, and when used with a fall arrestor and fall arrestor, it provides secondary protection for the operator, effectively preventing falls and protecting the operator's personal safety.

[0013] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a partial structural schematic diagram of the present invention; Figure 3 This is a cross-sectional schematic diagram of a partial structure of this utility model; Figure 4 This is a cross-sectional schematic diagram of a partial structure of this utility model; Figure 5 This is a schematic diagram of the overall structure of another embodiment of the present invention; Figure 6 This is a partial structural schematic diagram of another embodiment of the present invention; Figure 7 This is a partial structural diagram of another embodiment of the present invention (after removing the waterproof membrane). Figure 8 This is a cross-sectional schematic diagram of a partial structure of another embodiment of the present invention (after removing the waterproof membrane). Figure 9 This is a cross-sectional schematic diagram of a partial structure of another embodiment of the present invention (after removing the waterproof membrane). Figure 10 This is a cross-sectional schematic diagram of a partial structure of another embodiment of the present invention (after removing the waterproof membrane). The diagram shows the following markings: 1. Operating lever; 2. Hook assembly; 21. Hook body; 22. Rotating shaft; 23. Notch; 24. Double torsion spring; 241. First spring body; 242. Second spring body; 243. U-shaped connecting part; 244. First mounting foot; 245. Second mounting foot; 25. Reinforcing component; 26. Rope mounting shaft; 3. Safety buckle; 31. Right half of V-shape; 32. Left half of V-shape; 33. Semi-arc notch; 4. Pull rope; 41. Connecting ring; 5. Fall arrest rope; 6. Fall arrestor; 7. Reinforcing plate; 71. Mounting hole; 8. Outer shell; 81. Notch; 811. Rotating groove; 812. Arc-shaped slide groove; 813. Rotating shaft; 82. Safety buckle; 821. Right half of V-shape; 822. Left half of V-shape; 83. Spring assembly; 84. Guide post assembly; 85. Semi-arc slider; 9. Anti-sway positioning ball; 10. Waterproof membrane. Detailed Implementation

[0015] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0016] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0017] It should be noted that in the description of this utility model, the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0018] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installed", "equipped with", "sleeved / connected", "connected", etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0019] Furthermore, in this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0020] The following is a detailed description of this novel experimental device with reference to the accompanying drawings: Figure 1-10 This invention discloses a high-altitude operation fall prevention device, including: a telescopic operating rod 1, and a hook assembly 2, on which an anti-detachment safety buckle 3 is hinged, and the other end of the safety buckle 3 is connected to a pull rope 4. The hook assembly 2 is fixedly installed on the top of the operating rod 1. The fall arresting rope 5 has one end detachably connected to the hook assembly 2; The fall arrestor 6 is slidably connected to the fall arrestor rope 5 and is connected to the operator's safety belt.

[0021] Working principle: Before starting the climbing operation, the operator first installs the fall arrestor 5 to the hook assembly 2, then inserts the fall arrestor 6 into the fall arrestor 5, connecting the fall arrestor 6 to the operator's safety belt, completing the preparation work. Next, the operator extends the operating rod 1 and pulls the hanging rope to open the safety buckle 3, allowing the hook assembly 2 to suspend from the overhead contact line or the attachment on the support, providing fall protection for the operator's climbing path.

[0022] When workers climb upwards, their safety harness moves the fall arrestor 6 upwards with them until they reach the location of the hook assembly 2. First, the safety harness is connected to the surrounding fixed objects. Then, the pull rope 4 is pulled to open the safety buckle 3, allowing the hook assembly 2 to be removed. The worker continues to hang the hook at a certain height and repeats the above steps until they reach the work position. When workers need to climb downwards, they simply hold the fall arrestor 6, which will move downwards with them.

[0023] In the event of a fall, the fall arrestor 6 locks the fall arrestor rope 5. The operator will be protected from falling by the combined action of the safety belt, fall arrestor rope 5, fall arrestor 6 and hook assembly 2, effectively preventing personal injury accidents.

[0024] Among them, the fall arrestor 6 used in actual use is a commercially available product or an existing patent, and will not be explained in detail here.

[0025] In summary, this device increases the height of the safety hook for operators during climbing through the hook assembly 2, and, in conjunction with the hinged safety buckle 3 and the hanging rope, enables the opening and closing of the hook assembly 2, ensuring a stable connection between the hook assembly 2 and the fixed object. This effectively improves climbing efficiency. Furthermore, the combination of the fall arrest rope 5 and the fall arrestor 6 provides secondary protection for operators during climbing, effectively preventing falls and protecting their personal safety.

[0026] As described above, the operating lever 1 consists of multiple sections of levers with unequal or equal diameters connected together. In practical applications, existing materials can be prioritized. For levers with unequal diameters, a larger segment can be nested within a smaller segment. For levers with equal diameters, connections can be made via flanges, clips, or threads.

[0027] The retractable operating rod 1 increases the height of the safety harness during each operation, reducing the number of times the safety harness needs to be reattached during the climb, thereby effectively improving the efficiency of climbing operations.

[0028] As described above, the lower end of the pull rope 4 is provided with a connecting ring 41, and the connecting ring 41 is sleeved on the operating rod 1.

[0029] Working principle: The connecting ring 41 is sleeved on the operating rod 1, which enables the pull rope 4 to form a connection with the operating rod 1. During high-altitude operations, it can reduce the pull rope 4 from shaking due to external forces, which could cause the pull rope 4 to become entangled with surrounding objects, fall out of the operator's grasping range, and cause accidents.

[0030] In the above scheme, the way the fall arrest rope 5 and the hook assembly 2 are detachably connected is as follows: the bottom of the hook assembly 2 is provided with a reinforcing plate 7 with a mounting hole 71, and the fall arrest rope 5 is provided with a buckle. The fall arrest rope 5 is detachably connected to the mounting hole 71 through the buckle.

[0031] When it is necessary to connect the fall arresting rope 5 and the hook assembly 2, the shackle on the fall arresting rope 5 is passed through the mounting hole 71 and fixed to complete the assembly. When it is necessary to disassemble, simply pull the shackle out of the mounting hole 71 to separate them. The whole process is simple, direct and easy to operate. In addition, the reinforcing plate 7 provides a reinforcing rib for the hook assembly 2.

[0032] As described above, the structure of the hook assembly 2 includes: The hook body 21 is made by bending a solid round rod, and the top of the hook body 21 is a large R-shaped arc. The hook body 21 is fixedly installed on the side of the reinforcing plate 7. The safety buckle 3 is V-shaped and is mounted on the reinforcing plate 7 via a rotating shaft 22. The middle section of the safety buckle 3 has a notch 23 for the hook body 21 to achieve a rotation path. The double torsion spring 24 has a first spring body 241 and a second spring body 242 sleeved on both sides of the rotating shaft 22, and the first spring body 241 and the second spring body 242 are connected by a U-shaped connecting part 243. The U-shaped connecting part 243 is close to the reinforcing plate 7. The first mounting foot 244 extending from the other end of the first spring body 241 is set on the right half of the V-shape 31, and the second mounting foot 245 extending from the other end of the second spring body 242 is set on the right half of the V-shape 31. A reinforcing component 25 is installed on the left half of the V-shape 32, and a hanging rope mounting shaft 26 is screwed between the reinforcing component 25 and the left half of the V-shape 32.

[0033] Working principle: With the safety buckle 3 closed, the double torsion spring 24 is in its normal state, and the first spring body 241 and the second spring body 242 are in a natural or slightly deformed state. The first mounting foot 244 and the second mounting foot 245 apply torque to the right half of the V-shape 31. The initial preload of the double torsion spring 24 will cause the safety buckle 3 to naturally fit towards the hook body 21, forming an initial locking state, so that the hook assembly 2 is in a closed state, effectively realizing the connection with surrounding objects, stabilizing the suspension, and preventing accidental fall.

[0034] When the hook assembly 2 needs to be opened, the rope connected to the hanging rope mounting shaft 26 on the reinforcing member 25 of the V-shaped left half 32 of the safety buckle 3 is pulled, causing the V-shaped left half 32 to rotate counterclockwise around the rotating shaft 22, and causing the V-shaped right half 31 of the safety buckle 3 to rotate counterclockwise along the notch 23. When the safety buckle 3 rotates, it causes the rotating shaft 22 to rotate synchronously, causing the first spring body 241 and the second spring body 242 sleeved on the shaft to be twisted and deformed, and the safety buckle 3 to separate from the hook body 21, thus realizing the opening of the safety buckle 3.

[0035] After the operator completes the suspension or removal of the hook assembly 2, the pull rope is released. Under the restoring force of the double torsion spring 24 and the torsional deformation of the first spring body 241 and the second spring body 242 is restored, the first mounting foot 244 and the second mounting foot 245 apply a reverse torque to the right half of the V-shape 31, driving the safety buckle 3 to rotate back to the initial position around the rotating shaft 22, and the hook assembly 2 closes again.

[0036] Among them, ① in actual use, the pull rope is set as a nylon rope with a diameter of less than 8mm.

[0037] ② In actual use, an insulating and anti-slip layer can be applied to the inner layer of the hook body 21.

[0038] ③ In actual use, the hook body 21 and the safety buckle 3 should be made of high-strength alloy steel (such as No. 45 steel, alloy structural steel, etc.), and the surface should be coated with a material to improve corrosion resistance according to the usage scenario.

[0039] ④ In actual use, high-strength spring steel (such as 65Mn steel) can be used preferentially for double torsion spring 24.

[0040] The first spring body 241 and the second spring body 242 are respectively located on both sides of the rotating shaft 22. They are balanced by the U-shaped connecting part 243 to ensure that the torque of the safety buckle 3 is uniform and to prevent the safety buckle 3 from tilting or jamming due to unilateral force. The U-shaped connecting part 243 is close to the reinforcing plate 7 to ensure the stability of the double torsion spring 24 under force.

[0041] In summary, the hook assembly 2 opens and closes under the action of the double torsion spring 24, effectively preventing detachment due to accidental contact or other reasons, thus providing reliable safety for workers at heights. Furthermore, its simple overall structure allows for easy opening of the hook assembly 2 by simply pulling the rope, saving operation time and improving work efficiency during high-altitude operations.

[0042] As described above, the front end of the safety buckle 3 is provided with a semi-circular notch 33 that matches the size of the hook body 21. In actual use, when the safety buckle 3 and the hook body 21 are closed, the semi-circular notch 33 can wrap around the arc-shaped surface of the hook body 21, forming a tight mechanical connection. Through complementary shapes, the semi-circular notch 33 restricts the lateral and longitudinal displacement of the hook body 21, ensuring that the two will not loosen due to excessive gaps when subjected to force.

[0043] In the above scheme, the structure of the hook assembly 2 can also be replaced as follows: The multi-fold outer shell 8 has a magnet plate on the inner surface at the notch 81, and a rotating groove 811 on the back. Arc-shaped sliding grooves 812 are provided on the inner surfaces of both sides of the outer shell 8, and a rotating shaft 813 is provided inside the outer shell 8. The safety buckle 82 is V-shaped, and the corner of the V-shaped structure is hinged to the rotating shaft 813. The size of the right half 821 of the V-shape of the safety buckle 82 matches the notch 81, and a magnetic piece is provided at the top to attract the magnetic piece. The left half 822 of the V-shape of the safety buckle 82 extends from the rotating groove 811, and a pull rope 4 is connected to the tail end. Spring assembly 83, one end of which is connected to the inner surface of the right half of the V-shape 821, and the other end is connected to the outer casing 8, and there are three sets of springs arranged in a horizontal linear distribution; The guide post assembly 84 is fixedly mounted on the housing 8, and the spring assembly 83 is sleeved on the guide post assembly 84; The semi-circular slider 85 is symmetrically arranged on both sides of the right half of the V-shape 821, and the semi-circular slider 85 is slidably connected in the arc-shaped groove 812.

[0044] Working principle: With the safety buckle 82 closed, the spring assembly 83 is in normal condition. The magnetic piece at the top of the V-shaped right half 821 of the safety buckle 82 attracts the magnetic piece on the inner surface of the notch 81 of the outer shell 8, so that the V-shaped right half 821 of the safety buckle 82 fits tightly with the notch 81 of the outer shell 8, so that the hook assembly 2 is in a closed state, effectively realizing the connection with surrounding objects, stabilizing the suspension, and preventing accidental fall.

[0045] When the hook assembly 2 needs to be opened, the pull rope 4 connected to the tail end of the V-shaped left half 822 of the safety buckle 82 is pulled, causing the V-shaped left half 822 to rotate counterclockwise around the rotating groove 811 with the rotating shaft 813 as the center. This causes the safety buckle 82 to rotate around the hinge point of the rotating shaft 813 as the axis, and the V-shaped right half 821 moves counterclockwise accordingly. The magnetic piece separates from the magnetic plate, the spring assembly 83 is stretched, and the semi-arc slider 85 slides along the arc-shaped slide groove 812. The arc-shaped slide groove 812 provides a stable movement trajectory for the safety buckle 82, preventing the safety buckle from wobbling left and right.

[0046] After the operator has finished suspending or removing the hook assembly 2, the pull rope 4 is released. Under the restoring force of the spring assembly 83, the safety buckle 82 returns to its initial position, and the hook assembly 2 closes again.

[0047] Among them, ① the guide post group 84 provides a guide trajectory for the extension and retraction movement of the spring group 83, avoids the spring group 83 from deviating during the extension or reset process, ensures that the elastic force of the spring group 83 can stably act on the safety buckle 82, and enhances the overall structural stability of the hook assembly 2.

[0048] ② In actual use, the pull rope 4 is set to be a nylon rope with a diameter of less than 8mm.

[0049] ③ In actual use, an insulating and anti-slip layer can be applied to the inner layer of the outer shell 8.

[0050] ④ In actual use, the outer shell 8 and the safety buckle 82 should be made of high-strength alloy steel (such as No. 45 steel, alloy structural steel, etc.), and the surface should be coated with materials to improve corrosion resistance according to the usage scenario.

[0051] ⑤ In actual use, high-strength spring steel (such as 65Mn steel) can be preferentially used for spring assembly 83. At the same time, the three sets of spring assemblies 83 are arranged linearly in the transverse direction to ensure that the right half 821 of the V-shape of the safety buckle 82 is evenly stressed. Moreover, if one set of springs wears out, the other two sets of springs can still maintain a certain elasticity to ensure the normal rotation and reset of the safety buckle 82.

[0052] ⑥ When working at height, the control lever 1 may sway or swing due to external forces (such as wind). Anti-sway positioning ball 9 can be added to the bottom to increase the inertia of the bottom of the control lever 1, thereby suppressing the swing amplitude of the control lever 1 and keeping the control lever 1 in a relatively stable state during operation.

[0053] ⑦ In actual use, a waterproof membrane 10 is provided along the hinge path between the outer shell 8 and the safety buckle 82. When encountering rain or other liquids, the waterproof membrane 10, due to its impermeable properties, can prevent liquid from entering the hook assembly 2 through the hinge. This avoids corrosion of the metal parts at the hinge after liquid seepage. At the same time, the waterproof membrane 10 is made of a flexible material (such as commercially available plastic bags) and will not affect the rotation of the safety buckle 82 itself.

[0054] In summary, the hook assembly 2 opens and closes under the combined action of the spring assembly 83 and magnetic force, effectively preventing detachment due to accidental contact and providing reliable safety for workers at heights. Furthermore, its simple overall structure allows for easy opening of the hook assembly 2 by simply pulling the rope 4, saving operation time and improving work efficiency during high-altitude operations.

[0055] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. An aerial work platform fall arrest device comprising: The telescopic operating lever is characterized in that it further includes: a hook assembly, on which an anti-detachment safety buckle is hinged, and the other end of the safety buckle is connected to a pull rope, and the hook assembly is fixedly installed on the top of the operating lever; The fall arresting rope has one end detachably connected to the hook assembly; The fall arrestor is slidably connected to the fall arrestor rope and is also connected to the operator's safety belt.

2. The high-altitude operation fall protection device according to claim 1, characterized in that, The operating lever is composed of multiple sections of rods with unequal or equal diameters connected together.

3. The overhead work fall arrest device of claim 1, wherein, The lower end of the pull rope is provided with a connecting ring, and the connecting ring is sleeved on the operating rod.

4. The overhead work platform fall arrest device of claim 1, wherein, The fall arrest rope and hook assembly are detachably connected as follows: the bottom of the hook assembly is provided with a reinforcing plate with mounting holes, and the fall arrest rope is provided with a shackle. The fall arrest rope is detachably connected to the mounting holes through the shackle.

5. The overhead work fall arrest device of claim 4, wherein, The structure of the hook assembly includes: The main body of the hook is made by bending a solid round rod, and the top of the main body of the hook is a large R-shaped arc. The main body of the hook is fixedly installed to the side of the reinforcing plate. The safety buckle is V-shaped and is mounted on the reinforcing plate via a rotating shaft. The middle section of the safety buckle has a notch for the hook body to rotate. A double torsion spring, wherein the first spring body and the second spring body are sleeved on both sides of the rotating shaft, and the first spring body and the second spring body are connected by a U-shaped connecting part. The U-shaped connecting part is close to the reinforcing plate. The first mounting foot extending from the other end of the first spring body is located on the right half of the V-shape, and the second mounting foot extending from the other end of the second spring body is located on the right half of the V-shape. The reinforcing component is installed on the left half of the V-shape, and a hanging rope mounting shaft is screwed between the reinforcing component and the left half of the V-shape.

6. The overhead work fall arrest device of claim 5, wherein, The front end of the safety buckle is provided with a semi-circular notch that matches the size of the hook body.

7. The overhead work platform fall arrest device of claim 1, wherein, The structure of the hook assembly can also be replaced with: The multi-folded outer shell has a magnet plate on the inner surface of the notch and a rotating groove on the back. The inner surfaces of both sides of the outer shell have arc-shaped sliding grooves, and a rotating shaft is installed inside the outer shell. The safety buckle is V-shaped, and the corner of the V-shaped structure is hinged to the rotating shaft. The right half of the V-shape of the safety buckle matches the notch, and the top is provided with a magnetic piece that attracts the magnetic piece. The left half of the V-shape of the safety buckle extends from the rotating groove, and the tail end is connected to a pull rope. The spring assembly has one end connected to the inner surface of the right half of the V-shape and the other end connected to the outer shell, and there are three sets of springs arranged linearly in the transverse direction. The guide post assembly is fixedly mounted on the housing, and the spring assembly is sleeved on the guide post assembly; The semi-circular slider is symmetrically arranged on both sides of the right half of the V-shape, and the semi-circular slider is slidably connected in the arc-shaped groove.

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