Aerial work life rope fixing device suitable for construction frame body

The life line fixing device provides a secure, flexible, and damage-free attachment to construction scaffolds using adjustable components and guided rollers, improving safety and convenience in high-rise construction.

CN223104181UActive Publication Date: 2025-07-15THE FIRST COMPARY OF CHINA EIGHTH ENG BUREAU LTD
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Patent Information

Application Number
CN202421919322.1
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-09
Publication Date
2025-07-15
Estimated Expiration
2034-08-09

AI Technical Summary

Technical Problem

The traditional method of fixing life ropes for high-altitude operations requires holes to be drilled on the building structure surface, destroying the structure and limiting construction flexibility, and it is difficult to adjust the position of the rope, affecting construction efficiency and safety.

Method used

A high-altitude working life rope fixing device including clamping semi-cylinder, connecting the main frame, guide wheel frame and limiting assembly is designed. Through clamping and adjustable connecting structure, rapid installation and stable fixation are achieved, avoiding drilling, and adapting to different frame sizes and shapes.

Benefits of technology

It improves the flexibility and safety of construction, avoids structural surface damage, reduces repair work, ensures smooth operation and stable fixation of the safety rope, and enhances the adaptability and reliability of the device.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of building safety devices, in particular to a high-altitude operation life rope fixing device suitable for a construction frame body, which comprises two clamping semicircular cylinders which are symmetrically arranged, and the clamping semicircular cylinders are connected together through a connecting plate and a plurality of connecting grooves. The connecting main framework is arranged between the two clamping semicircular cylinders and provided with a plurality of guide wheel frames. A steering wheel assembly and a limiting assembly are installed on the guide wheel frame and used for adjusting and guiding the position of the safety rope and preventing the steering wheel from excessively rotating. The fixing frame assembly is arranged at one end of the connecting main framework and connected with one end of the safety rope, and stability and safety of the safety rope are guaranteed. By means of the device, the life rope can be stably installed on the construction frame body under the condition that the structural face of the sloping roof is not damaged, and the device has the advantages of being free of damage to installation, high in stability, high in adaptability, capable of simplifying the construction process and convenient and fast to maintain and is suitable for high-altitude operation safety guarantee in various construction environments.
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Description

Technical Field

[0001] The utility model relates to the technical field of construction safety devices, in particular to a fixing device for a high-altitude operation life rope applicable to a construction scaffold. Background Technique

[0002] With the acceleration of the urbanization process, high-rise buildings are increasing day by day, and high-altitude operations are becoming more and more common in building construction. In this context, it is particularly important to ensure the safety of high-altitude operation personnel. As an important personal protective equipment, the stability and reliability of the fixing device of the high-altitude operation life rope are directly related to the life safety of the operators.

[0003] The traditional method for fixing the high-altitude operation life rope of a construction scaffold is usually to fix the life rope on the structural surface of the building through bolts. However, this method has many disadvantages: First, it is necessary to drill holes in the structural surface, which not only damages the original structure of the building but also may affect the subsequent construction of the decorative surface layer; Second, the bolt fixing method needs to be carried out after the structural surface construction is completed, which limits the flexibility of the construction; Finally, once fixed, the position of the life rope is difficult to adjust, which brings inconvenience to the actual operation of the operators.

[0004] How to solve the above technical problems is the subject faced by the utility model. Summary of the Invention

[0005] In order to solve the deficiencies of the prior art, the utility model provides a fixing device for a high-altitude operation life rope applicable to a construction scaffold, which is reasonable in design, safe and reliable. Through a unique structural design, it not only avoids the problems of damaging the structural surface and affecting the construction of the decorative surface layer, but also can realize the stable fixing and flexible adjustment of the life rope, providing a safer and more convenient protection measure for high-altitude operation personnel.

[0006] The technical solution adopted by the utility model to solve its technical problems is: a fixing device for a high-altitude operation life rope applicable to a construction scaffold, including two symmetrically arranged clamping semi-cylinders. At the open ends of the clamping semi-cylinders, there are connecting plates that cooperate with the other clamping semi-cylinder, and a plurality of connecting grooves are evenly opened along the axial direction of the clamping semi-cylinder in the connecting grooves. There are connecting screws connecting with the connecting plates on the other clamping semi-cylinder.

[0007] A connection main framework that cooperates with the connection screw is arranged between the two clamping semi-cylinders. A number of guide wheel brackets are arranged on the connection main framework, and the number of the guide wheel brackets is evenly arranged along the axial direction of the clamping semi-cylinder. A steering wheel assembly is arranged on the guide wheel bracket, and a limiting component for the steering wheel assembly is arranged on the guide wheel bracket. A fixing frame assembly that cooperates with the guide wheel bracket and is tied to one end of the safety rope is arranged at one end of the connection main framework along the axial direction of the clamping semi-cylinder.

[0008] Furthermore, the connection main framework includes a transverse bone beam whose length direction is consistent with the axial direction of the clamping semi-cylinder. A connection U-shaped bracket is arranged at one end of the transverse bone beam. A number of connection holes that are in one-to-one cooperation with the connection grooves are evenly opened on the connection U-shaped bracket along the axial direction of the clamping semi-cylinder. An extrusion pad unit that cooperates with the connecting plate is arranged in the connection U-shaped bracket.

[0009] Preferably, two structural designs of the extrusion pad unit are provided, specifically as follows:

[0010] First, there are two groups of the extrusion pad units, and the two groups of the extrusion pad units are symmetrically arranged at both ends of the connection U-shaped bracket. Each group of the extrusion pad units includes a number of the extrusion pad units that are evenly arranged along the axial direction of the clamping semi-cylinder;

[0011] The extrusion pad unit includes a threaded cylinder arranged on the connection U-shaped bracket. An extrusion rod is arranged in the threaded cylinder. A contact circular plate that contacts the connecting plate is arranged at one end of the extrusion rod close to the connecting plate.

[0012] Second, the extrusion pad unit includes two groups of extrusion pads symmetrically arranged on the connection U-shaped bracket. Each group of the extrusion pads includes a filling pad located between the connection U-shaped bracket and the connecting plate.

[0013] Furthermore, connection arc pieces that cooperate with the clamping semi-cylinder are arranged at both open ends of the connection U-shaped bracket. Connection screws for connecting a number of the clamping semi-cylinders are arranged on the connection arc pieces. Correspondingly, threaded holes that cooperate with the connection screws are arranged on the clamping semi-cylinder.

[0014] Furthermore, the guide wheel bracket includes two symmetrically arranged clamping plates. A connecting plate is horizontally arranged between the two clamping plates. The clamping plates are in contact with the transverse bone beam, and the cross-sections of the two clamping plates and the connecting plate are in an I-shape;

[0015] A number of through holes are arranged on the clamping plates. A group of stabilizing holes that cooperate with the through holes are arranged on the transverse bone beam. A connecting rod that penetrates through the stabilizing holes is arranged in the stabilizing holes. Stabilizing nuts are arranged at both ends of the connecting rod.

[0016] Furthermore, the fixing frame assembly includes a fixing frame with the same structure as the guide wheel frame. A fixing rod is provided on the fixing frame, and a plurality of auxiliary inclined rods for assisting in hanging one end of the safety rope are provided on the fixing rod.

[0017] The steering wheel assembly includes a rotating shaft hole formed in the clamping plate. A rotating shaft is provided in the rotating shaft hole, and a steering wheel is provided on the rotating shaft.

[0018] Preferably, two structural designs of the limiting assembly are provided, specifically as follows:

[0019] First, the limiting assembly includes an upper limiting gear provided at one end of the rotating shaft. A pawl engaged with the limiting gear is provided on the clamping plate, and a mounting spring cooperating with the pawl is provided on the clamping plate.

[0020] Second, the limiting assembly includes a limiting disc provided at one end of the rotating shaft. A limiting strip groove is formed in the limiting disc. A limiting strip plate cooperating with the limiting strip groove is connected to the clamping plate through a rotating shaft, and a limiting insertion rod is provided on the limiting strip plate.

[0021] One end of the limiting strip plate is rotatably connected to the clamping plate through the rotating shaft, and a limiting screw rod connected to the clamping plate is provided at the other end of the limiting strip plate.

[0022] The structure of the present utility model is specifically designed for construction frameworks, without relying on the completed structural surfaces, and can be quickly installed at any stage of construction, greatly improving the construction flexibility and efficiency. Through the tight fit between the clamping semi-cylinder and the construction framework, as well as the adjustable design of the connecting main skeleton, it is ensured that the device can adapt to frameworks of different sizes and shapes, achieving rapid deployment and stable fixation.

[0023] Different from the traditional fixing method, the present utility model avoids directly drilling holes on the structural surface for fixation, thereby effectively preventing damage to the structural surface, reducing subsequent repair work, and saving time and cost. This feature is particularly important for special structures such as inclined roofs, which not only maintains the integrity and aesthetics of the structure but also creates favorable conditions for the subsequent construction of the decorative surface layer.

[0024] The addition of the guide wheel frame and the steering wheel assembly in the present utility model significantly reduces the friction of the safety rope during movement, ensures the smooth operation of the life rope during high-altitude operations, and improves the safety factor of the operators. The setting of the limiting assembly further enhances the stability of the device, ensuring that the steering wheel will not rotate randomly even in case of emergencies, effectively avoiding potential safety hazards.

[0025] The combination of the horizontal beam in the main connecting framework and the connecting U-shaped frame forms a solid support system, enhancing the overall strength and stability of the device. The adjustable feature of the extrusion cushion block unit enables the device to closely fit the construction framework, ensuring good fixing effects on both straight and curved structures, and enhancing the adaptability and reliability of the device.

[0026] The ingenious design of the fixing frame assembly in this utility model not only provides a reliable fixing point for the safety rope but also facilitates fine-tuning according to operation requirements, ensuring the safety of operators at different heights and angles. Meanwhile, the modular design of the device makes the maintenance and replacement of components simple and fast, reducing the maintenance cost during long-term use. Description of the Drawings

[0027] Figure 1 It is a three-dimensional structural schematic diagram of this utility model.

[0028] Figure 2 It is an enlarged schematic diagram of part A of this utility model.

[0029] Figure 3 It is a three-dimensional schematic diagram of a part of the structure of this utility model from the first perspective.

[0030] Figure 4 It is a three-dimensional schematic diagram of a part of the structure of this utility model from the second perspective.

[0031] Among them, the drawing reference signs are: 100, clamping semi-cylinder; 200, main connecting framework; 210, horizontal beam; 220, connecting U-shaped frame; 221, connecting hole; 222, extrusion cushion block unit; 222a, threaded cylinder; 222b, extrusion rod; 222c, abutting circular plate; 222d, filling cushion block; 230, connecting arc plate; 240, connecting screw; 300, guide wheel frame; 310, clamping plate; 320, connecting plate; 330, stabilizing hole; 340, connecting rod; 350, stabilizing nut; 400, steering wheel assembly; 410, rotating shaft hole; 420, rotating shaft; 430, steering wheel; 500, limiting assembly; 510, limiting disc; 520, limiting strip groove; 530, limiting strip plate; 540, limiting insertion rod; 550, rotating shaft; 560, limiting screw; 600, fixing frame assembly; 610, fixing frame; 620, fixing rod; 630, auxiliary inclined rod. Specific Embodiment

[0033] See Figures 1 to 4As shown in the figure, a safety rope fixing device for high-altitude operations applicable to construction frameworks includes two symmetrically arranged clamping semi-cylinders 100. At the two open ends of the clamping semi-cylinders 100, there are connecting plates that cooperate with the other clamping semi-cylinder 100. And the connecting plates are evenly provided with a plurality of connecting grooves along the axial direction of the clamping semi-cylinders 100. In the connecting grooves, there are connecting screws that connect with the connecting plates on the other clamping semi-cylinder 100.

[0034] Between the two clamping semi-cylinders 100, there is a connecting main framework 200 that cooperates with the connecting screws. And on the connecting main framework 200, there are a plurality of guide wheel frames 300. And the plurality of guide wheel frames 300 are evenly arranged along the axial direction of the clamping semi-cylinders 100. On the guide wheel frames 300, there are steering wheel assemblies 400. On the guide wheel frames 300, there are limiting assemblies 500 for the steering wheel assemblies. At one end of the connecting main framework 200 along the axial direction of the clamping semi-cylinders 100, there is a fixing frame assembly 600 that cooperates with the guide wheel frames 300 and is used for hanging one end of the safety rope.

[0035] Specifically, the device consists of two symmetrically arranged clamping semi-cylinders 100. At the two open ends of these semi-cylinders, there are connecting plates for cooperating with the other semi-cylinder to form the main body structure of the fixing device. The connecting plates are evenly provided with a plurality of connecting grooves along the axial direction of the clamping semi-cylinders 100. In these grooves, there are connecting screws for fixing the two clamping semi-cylinders 100 to ensure the stability of the device. At the same time, between the two clamping semi-cylinders 100, there is a connecting main framework 200 that cooperates with the connecting screws to provide the main support structure of the device.

[0036] In addition, a plurality of guide wheel frames 300 are evenly arranged on the connecting main framework 200. Each guide wheel frame 300 is provided with a steering wheel assembly 400 for guiding the direction of the safety rope. And the steering wheel assemblies 400 on the guide wheel frames 300 allow the safety rope to move smoothly, reduce friction, and improve the safety and convenience of operation. Moreover, the limiting assemblies 500 ensure that the steering wheels 430 will not rotate randomly under the action of abnormal external forces, increasing the reliability of the system. At one end of the connecting main framework 200, there is a fixing frame assembly 600 that cooperates with the guide wheel frames 300 for hanging one end of the safety rope to ensure the safety of the operators.

[0037] Furthermore, the connecting main framework 200 includes a transverse bone beam 210 whose length direction is the same as the axial direction of the clamping semi-cylinders 100. At one end of the transverse bone beam 210, there is a connecting U-shaped frame 220. The connecting U-shaped frame 220 is evenly provided with a plurality of connecting holes 221 that cooperate with the connecting grooves one by one along the axial direction of the clamping semi-cylinders 100. In the connecting U-shaped frame 220, there is an extrusion pad unit 222 that cooperates with the connecting plates.

[0038] Preferably, two structural designs of the extrusion pad units 222 are provided, which are specifically as follows:

[0039] First, there are two sets of the extrusion pad units 222, and the two sets of the extrusion pad units 222 are symmetrically arranged at both ends of the connecting U-shaped frame 220, and each set of the extrusion pad units 222 includes a plurality of the extrusion pad units 222 uniformly arranged along the axial direction of the clamping semi-cylindrical barrel 100;

[0040] The extrusion pad unit 222 includes a threaded barrel 222a arranged on the connecting U-shaped frame 220, an extrusion rod 222b is arranged in the threaded barrel 222a, and a contact circular plate 222c in contact with the connecting plate is arranged at one end of the extrusion rod 222b close to the connecting plate.

[0041] Second, the extrusion pad unit 222 includes two sets of extrusion pads symmetrically arranged on the connecting U-shaped frame 220, and each set of the extrusion pads includes a filling pad 222d located between the connecting U-shaped frame 220 and the connecting plate.

[0042] Specifically, the connecting main frame 200 includes a transverse bone beam 210, one end of which is provided with a connecting U-shaped frame 220, and the connecting U-shaped frame 220 is provided with an extrusion pad unit 222 for fixing the connecting plate and providing additional stability. The extrusion pad unit 222 provides two designs. One is that an extrusion rod 222b is arranged in the threaded barrel 222a, and a contact circular plate 222c is arranged at the end of the extrusion rod 222b; the other is a filling pad 222d located between the connecting U-shaped frame 220 and the connecting plate, providing a better fixing effect.

[0043] Furthermore, connection arc pieces 230 matched with the clamping semi-cylindrical barrel 100 are arranged at both open ends of the connecting U-shaped frame 220, connection screws 240 connecting a plurality of the clamping semi-cylindrical barrels 100 are arranged on the connection arc pieces 230, and correspondingly, threaded holes matched with the connection screws 240 are arranged on the clamping semi-cylindrical barrel 100.

[0044] Specifically, connection arc pieces 230 are arranged at both ends of the connecting U-shaped frame 220, which are matched with the clamping semi-cylindrical barrel 100 and fixed by connection screws 240 to ensure the tight fit of the device.

[0045] Furthermore, the guide wheel frame 300 includes two symmetrically arranged clamping plates 310, a connecting plate 320 is horizontally arranged between the two clamping plates 310, the clamping plates 310 are in contact with the transverse bone beam, and the cross-sections of the two clamping plates 310 and the connecting plate 320 are in an I shape;

[0046] A plurality of through holes are provided on the clamping plate 310, a set of stabilizing holes 330 matching the through holes are provided on the transverse beam, a connecting rod 340 passing through the stabilizing holes 330 is provided in the stabilizing holes 330, and stabilizing nuts 350 are provided at both ends of the connecting rod 340.

[0047] Specifically, through holes are provided on the clamping plate 310 of the guide wheel frame 300, stabilizing holes 330 are provided on the transverse beam 210, the connecting rod 340 passes through these holes and is fixed with stabilizing nuts 350 to provide the stability of the structure.

[0048] Furthermore, the fixing frame assembly 600 includes a fixing frame 610 having the same structure as the guide wheel frame 300, a fixing rod 620 is provided on the fixing frame 610, and a plurality of auxiliary inclined rods 630 for assisting in hanging one end of the safety rope are provided on the fixing rod 620; the steering wheel assembly 400 includes a rotating shaft hole 410 opened on the clamping plate 310, a rotating shaft 420 is provided in the rotating shaft hole 410, and a steering wheel 430 is provided on the rotating shaft 420.

[0049] Specifically, auxiliary inclined rods 630 are provided on the fixing frame assembly 600 to assist in hanging the safety rope and ensure the safety of the operator during use. The fixing frame assembly 600 not only provides a reliable fixing point for the safety rope, but also enhances the stability and convenience of use of the safety rope through the auxiliary inclined rods 630, ensuring the safety of the operator in a complex environment.

[0050] Preferably, two structural designs of the limiting assembly 500 are provided as follows:

[0051] First, the limiting assembly 500 includes an upper limiting gear provided at one end of the rotating shaft 420, a pawl meshing with the limiting gear is provided on the clamping plate 310, and a mounting spring cooperating with the pawl is provided on the clamping plate 310.

[0052] Second, the limiting assembly 500 includes a limiting disc 510 provided at one end of the rotating shaft 420, a limiting strip groove 520 is opened on the limiting disc 510, a limiting strip plate 530 cooperating with the limiting strip groove is connected to the clamping plate 310 through a rotating shaft 550, and a limiting insertion rod 540 is provided on the limiting strip plate 530;

[0053] One end of the limiting strip plate 530 is rotatably connected to the clamping plate 310 through the rotating shaft 550, and a limiting screw rod 560 connected to the clamping plate 310 is provided at the other end of the limiting strip plate 530.

[0054] Specifically, a limiting component 500 that cooperates with the steering wheel assembly 400 is provided on the clamping plate 310 to prevent the safety rope from falling off due to excessive rotation of the steering wheel 430. Two structural designs are provided. One is to achieve one-way locking through a limiting gear and a pawl, and the other is to achieve angle limitation through a limiting disc 510 and a limiting strip plate 530.

[0055] The technical features not described in the present utility model can be achieved by or adopted from the prior art, and will not be elaborated herein. Of course, the above description is not a limitation on the present utility model, and the present utility model is not limited to the above examples. Changes, modifications, additions, or substitutions made by those of ordinary skill in the art within the scope of the essence of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. An aerial work life rope fixing device applicable to a construction scaffold, characterized in that: It includes two symmetrically arranged clamping semi-cylinders (100). At both ends of the opening of the clamping semi-cylinder (100), there are connecting plates that cooperate with the other clamping semi-cylinder (100). And a number of connecting grooves are evenly opened along the axial direction of the clamping semi-cylinder (100) on the connecting plates. In the connecting grooves, there are connecting screws that connect with the connecting plates on the other clamping semi-cylinder (100). Between the two clamping semi-cylinders (100), there is a connecting main framework (200) that cooperates with the connecting screws. And a number of guide wheel frames (300) are arranged on the connecting main framework (200). And a number of the guide wheel frames (300) are evenly arranged along the axial direction of the clamping semi-cylinder (100). A steering wheel assembly (400) is arranged on the guide wheel frame (300). A limiting component (500) of the steering wheel assembly is arranged on the guide wheel frame (300). At one end of the connecting main framework (200) along the axial direction of the clamping semi-cylinder (100), there is a fixed frame assembly (600) that cooperates with the guide wheel frame (300) and is tied to one end of a safety rope.

2. The high-altitude operation life rope fixing device for a construction scaffold according to claim 1, characterized in that: The connecting main framework (200) includes a transverse bone beam (210) whose length direction is consistent with the axial direction of the clamping semi-cylinder (100). At one end of the transverse bone beam (210), there is a connecting U-frame (220). A number of connecting holes (221) that cooperate with the connecting grooves one by one are evenly opened along the axial direction of the clamping semi-cylinder (100) on the connecting U-frame (220). An extrusion pad unit (222) that cooperates with the connecting plate is arranged in the connecting U-frame (220).

3. The fixing device for the life rope for high-altitude work applicable to a construction scaffold according to claim 2, characterized in that: There are two groups of the extrusion pad units (222). And the two groups of the extrusion pad units (222) are symmetrically arranged at both ends of the connecting U-frame (220). And each group of the extrusion pad units (222) includes a number of the extrusion pad units (222) that are evenly arranged along the axial direction of the clamping semi-cylinder (100). The extrusion pad unit (222) includes a threaded cylinder (222a) arranged on the connecting U-frame (220). An extrusion rod (222b) is arranged in the threaded cylinder (222a). At one end of the extrusion rod (222b) close to the connecting plate, there is a contact circular plate (222c) that contacts the connecting plate.

4. The fixing device for the high-altitude operation life rope applicable to the construction framework according to claim 2, characterized in that: The extrusion pad unit (222) includes two groups of extrusion pads symmetrically arranged on the connecting U-frame (220). And each group of the extrusion pads includes a filling pad (222d) located between the connecting U-frame (220) and the connecting plate.

5. The fixing device for the life rope for high-altitude work applicable to a construction scaffold according to claim 2, wherein: At both ends of the opening of the connecting U-frame (220), there are connecting arc plates (230) that cooperate with the clamping semi-cylinder (100). Connecting screws (240) that connect with a number of the clamping semi-cylinders (100) are arranged on the connecting arc plates (230). Correspondingly, threaded holes that cooperate with the connecting screws (240) are arranged on the clamping semi-cylinder (100).

6. The high-altitude operation life rope fixing device applicable to a construction scaffold according to claim 2, characterized in that: The guide wheel frame (300) includes two symmetrically arranged clamping plates (310). A connecting plate (320) is horizontally arranged between the two clamping plates (310). The clamping plates (310) are in contact with the transverse beam, and the cross-sections of the two clamping plates (310) and the connecting plate (320) are in an I-shape. A number of through holes are provided on the clamping plate (310). A set of stabilizing holes (330) that cooperate with the through holes are provided on the transverse beam. A connecting rod (340) passing through the stabilizing holes (330) is arranged in the stabilizing holes (330). Stabilizing nuts (350) are arranged at both ends of the connecting rod (340).

7. The fixing device for the high-altitude working life rope applicable to the construction scaffold according to claim 6, characterized in that: The fixed frame assembly (600) includes a fixed frame (610) having the same structure as the guide wheel frame (300). A fixed rod (620) is provided on the fixed frame (610). A number of auxiliary inclined rods (630) for hanging one end of a safety rope are provided on the fixed rod (620). The steering wheel assembly (400) includes a rotating shaft hole (410) opened on the clamping plate (310). A rotating shaft (420) is arranged in the rotating shaft hole (410). A steering wheel (430) is arranged on the rotating shaft (420).

8. The fixing device for the high-altitude operation life rope applicable to the construction scaffold according to claim 7, characterized in that: The limiting assembly (500) includes an upper limiting gear arranged at one end of the rotating shaft (420). A ratchet claw that meshes with the limiting gear is provided on the clamping plate (310). An installation spring that cooperates with the ratchet claw is provided on the clamping plate (310).

9. The fixing device for the high-altitude working life rope applicable to a construction scaffold according to claim 7, characterized in that: The limiting assembly (500) includes a limiting disc (510) arranged at one end of the rotating shaft (420). A limiting strip groove (520) is opened on the limiting disc (510). A limiting strip plate (530) that cooperates with the limiting strip groove is connected to the clamping plate (310) through a rotating shaft (550). A limiting insertion rod (540) is provided on the limiting strip plate (530). One end of the limiting strip plate (530) is rotatably connected to the clamping plate (310) through the rotating shaft (550). A limiting screw rod (560) connected to the clamping plate (310) is arranged at the other end of the limiting strip plate (530).