Bandage device and protector with same

Abstract

The utility model relates to the technical field of sports equipment, and discloses a binding band device and a protective tool with the binding band device, the binding band device comprises a flexible binding band body, two ends of the flexible binding band body are respectively connected with a first connector and a second connector, and the second connector is detachably connected to the protective tool to which the flexible binding band is applied. The flexible bandage can be used as an expansion function part to be fixed on the outer side of the protective tool, can form a double locking mechanism with the protective tool on the bottom layer, exerts directional pressure on corresponding positions (such as the periphery of patella and the attachment point of achilles tendon) in strenuous exercise or complex actions, effectively limits relative sliding of the protective tool and limbs, improves dynamic protection efficiency, and is safe and reliable. And the secondary injury risk is reduced.

Description

Technical Field

[0001] This utility model relates to the field of sports equipment technology, and in particular to a strapping device and protective gear having the same. Background Technology

[0002] In the fields of medical rehabilitation, sports protection, and daily joint protection, traditional protective gear (such as knee braces and ankle braces) mainly provides basic support and restricts excessive movement of target areas through fixed structures or elastic materials. However, existing protective gear has the following technical shortcomings:

[0003] Insufficient stability: During strenuous exercise or complex movements, protective gear is prone to displacement due to limb deformation or friction, resulting in a decrease in protective effectiveness;

[0004] Limitations of pressure adjustment: The pressure distribution of traditional braces is determined by pre-formed structures or homogeneous elastic materials, making it impossible to dynamically adjust local pressure according to individual needs, and making it difficult to take into account the differences in swelling, muscle tension or recovery stage among different users.

[0005] To achieve reliable connection and pressure adjustment of protective gear, adjustable protective gear structures have gradually been developed. Most existing adjustable sports protective gear uses traditional Velcro connections. With this method, users need to repeatedly open and close the Velcro to adjust the strap length, which is not only time-consuming, but also causes the Velcro's adhesiveness to gradually decrease after repeated use, resulting in a loose fit. During exercise, especially high-intensity exercise, the Velcro may accidentally come loose, causing the protective gear to shift and failing to provide effective protection for the body parts. While some adjustable sports protective gear uses buckle connections, these buckles are often complex in structure and large in size, increasing the weight of the protective gear and discomfort. Furthermore, these buckles are difficult to install and remove to ensure a tight connection during exercise, requiring considerable force, which is extremely inconvenient for users with insufficient hand strength or those fatigued after exercise.

[0006] For example, prior art document CN108939517A discloses a sports protective gear, including: a wearing part, a slide rail, a slider, and a buffer; the slide rail is disposed on the wearing part, the slider and the slide rail are slidably connected, and the position of the slider on the slide rail is adjustable; the buffer is connected to the slider. By having the slider drive the buffer to move on the slide rail, protection for the user can be achieved through the buffer. Furthermore, the slider and slide rail structure allows the buffer to provide sufficient protective force while avoiding the problem of the buffer being too large and affecting the user's movement flexibility. However, this sports protective gear has a relatively complex structure, including multiple components such as a drive device, a distance sensor, and a controller, increasing product cost and the risk of failure.

[0007] Furthermore, clinical studies (such as those published in the *Journal of Sports Medicine and Rehabilitation*) have shown that applying gradient pressure can improve joint proprioception, promote tissue fluid return, and enhance muscle group synergistic stability. However, existing braces lack modular pressure components, making it difficult to achieve precise pressure control.

[0008] Therefore, how to balance the ease of adjustment, the stability of fixation, the comfort, and the good connection with protective gear, so as to improve the overall performance of protective gear and the user experience, is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0009] The purpose of this utility model is to solve the problems existing in the prior art by proposing a strapping device and a protective gear having the same.

[0010] To achieve the above objectives, the present invention adopts the following technical solution:

[0011] A strapping device includes a flexible strap body, with a first connector and a second connector respectively connected to both ends of the flexible strap body, the second connector being detachably connected to the protective gear on which the flexible strap is applied;

[0012] A fastening block is fitted onto the flexible strap body. The fastening block can slide or be fixed relative to the flexible strap body. The first connector is detachably connected to the fastening block to open or close the strap device.

[0013] Preferably, the fastening block and the first connector are connected by a matching first fastening connector and a fastening groove.

[0014] Preferably, the fastening block includes a fastening frame, a limiting block is provided at the position of the fastening frame, and a gap is provided between the limiting block and the fastening frame. The flexible strap body enters from the gap on one side of the limiting block and exits from the gap on the other side.

[0015] Preferably, the fastening frame is rectangular in shape, and the length direction of the fastening frame is perpendicular to the length of the flexible strap body. The fastening frame and the limiting block are integrally formed.

[0016] Preferably, the first buckle is disposed on the outer surface of the limiting block on the side away from the flexible strap body, and a connection gap is formed between the limiting head of the first buckle and the limiting block.

[0017] Preferably, the first connector is provided with a fastening part, and a fastening groove is provided in the fastening part, so that the limiting head of the first fastening head can pass through the fastening groove and be limited by the fastening part.

[0018] Preferably, an expansion joint is provided on the side of the fastening groove near the flexible strap, and the fastening groove communicates with the expansion joint.

[0019] Preferably, a receiving portion is provided on the first connector head, the receiving portion being used to receive the limiting head after passing through the fastening groove.

[0020] Preferably, the flexible strap body uses an elastic tension band in at least a portion of its sections, and the first connector and the second connector are fixed to the flexible strap body by stitching or bonding, with the first connector and the second connector arranged symmetrically along the centerline of the flexible strap body.

[0021] Another embodiment of this utility model provides a protective gear, including the strapping device as described above. The protective gear includes a back protector, knee pad, wrist guard, elbow pad, ankle protector, head protector, or neck protector. A second buckle is provided on the protective gear. The second buckle is snapped into a buckle groove provided on the second connector. The buckle groove of the first connector engages with the first buckle of the buckle block. The limiting head of the first buckle and the limiting head of the second buckle are circular.

[0022] Compared with the prior art, the beneficial effects of this utility model are:

[0023] 1. This flexible strap can be fixed to the outside of the protective gear as an extension component. It can form a double locking mechanism with the bottom protective gear. During strenuous exercise or complex movements, it applies directional pressure to the corresponding positions (such as the periphery of the patella and the attachment point of the Achilles tendon), effectively limiting the relative sliding between the protective gear and the limb, improving dynamic protection effectiveness, and reducing the risk of secondary injury.

[0024] 2. This flexible bandage is installed using a buckle connection. With the position adjustment of the buckle block, users can apply gradient pressure precisely according to the degree of limb swelling, muscle condition, or rehabilitation stage without having to replace the entire set of protective gear. Compared with the homogeneous pressure distribution of traditional protective gear, this system can specifically enhance the synergistic stability of the muscles around the joint, promote tissue fluid return, and avoid blood circulation disorders caused by excessive local compression, significantly improving physiological adaptability. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a strapping device proposed in this utility model applied to protective gear;

[0026] Figure 2 This is a schematic diagram of a strapping device and protective gear having the same, as proposed in this utility model.

[0027] Figure 3 This is a front perspective view of a strapping device proposed in this utility model;

[0028] Figure 4 This is a schematic diagram of the first connector of a strapping device proposed in this utility model;

[0029] Figure 5 This is a three-dimensional view of the back of a strapping device proposed in this utility model;

[0030] Figure 6 This is a schematic diagram of the back of the first connector of the strapping device proposed in this utility model;

[0031] Figure 7 This is a schematic diagram of the first buckle of a strapping device proposed in this utility model.

[0032] In the figure: 1. Flexible strap body; 2. First connector; 3. Second connector; 4. Receiving part; 5. Protective gear; 6. Fastening frame; 7. Fastening groove; 8. First fastening head; 9. Second fastening head; 10. Limiting block; 11. Fastening part; 12. Expansion joint; 13. Fastening block; 14. Limiting head; 15. Connection gap. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0034] Reference Figures 1-7 A strapping device includes a flexible strap body 1, with a first connector 2 and a second connector 3 connected to both ends of the flexible strap body 1, and the second connector 3 being detachably connected to the protective gear 5 on which the flexible strap is applied;

[0035] A fastening block 13 is fitted onto the flexible strap body 1. The fastening block 13 can slide or be fixed relative to the flexible strap body 1. The first connector 2 is detachably connected to the fastening block 13 to open or close the strap device.

[0036] The strapping device disclosed in this application mainly consists of a flexible strap body 1, a first connector 2, a second connector 3, and a fastening block 13. The first connector 2 and the second connector 3 are fixed at opposite ends of the flexible strap body 1. The second connector 2 is detachably connected to the protective gear 5, enabling a quick and stable connection between the strap and the protective gear 5. The flexible strap body 1 is fitted with a fastening block 13 that can slide or be fixed relative to it, allowing the user to flexibly adjust the tightness of the strap as needed. The fastening block 13 and the first connector 2 are detachably connected. When the user needs to open or close the strapping device, they only need to simply operate the connection state of the fastening block 13 and the first connector 2, without having to repeatedly peel and stick or perform laborious operations like traditional Velcro or complex buckles, greatly improving the convenience of use.

[0037] The strapping device disclosed in this application, through the design of a detachable connector and a sliding buckle block 13, makes it simpler and faster for users to adjust the tightness of the straps or open and close the strapping device, saving a significant amount of time. It allows for quick adjustment of the protective gear to adapt to different activity states or wearer needs. Furthermore, due to its relatively simple structure, without the introduction of additional drive devices, sensors, or other complex components, product costs are reduced, the risk of failure is decreased, and overall reliability is improved.

[0038] As a preferred example of this application, the fastening block 13 and the first connector 2 are connected by a matching first fastening connector 8 and fastening groove 7. In this example, the first connector 2 is provided with a fastening groove 7, and the first fastening connector 8 is provided on the fastening block 13. The first fastening connector 8 can slide or be fixed along the flexible strap body 1 relative to the fastening block 13. This configuration discloses a structural form for connecting the strap device connector and the fastening block 13, allowing the user to quickly connect or separate the fastening block 13 and the first connector 2 through a simple plugging and unplugging action, thereby realizing the opening or closing of the strap device. When adjusting the strap tightness, the user only needs to slide the fastening block 13 to the appropriate position and then ensure that the first fastening connector 2 and the fastening groove 7 are securely engaged to easily lock the current tightness. This snap-fit ​​connection method is not only easy to operate but also provides a secure connection, effectively avoiding the loosening or falling off problems that may occur in traditional connection methods.

[0039] In this embodiment, the fastening block 13 includes a fastening frame 6, and a limiting block 10 is provided at the middle position of the fastening frame 6, with a gap between the limiting block 10 and the fastening frame 6. The flexible strap body 1 enters from the gap on one side of the limiting block 10 and exits from the gap on the other side. The fastening frame 6 is generally rectangular, and the length direction of the fastening frame 6 is perpendicular to the length direction of the flexible strap body 1. The fastening frame 6 and the limiting block 10 are integrally formed from a rigid material or an elastic restoring and deformable material. The gaps on both sides of the limiting block 10 form an adjustable threading channel, and the user can adjust the threading depth of the strap in the gap to achieve graded control of the pressure value.

[0040] This design discloses a specific structure of the fastening block 13, including a fastening frame 6 and a limiting block 10 disposed thereon. The fastening frame 6 is rectangular in shape, and its length direction is perpendicular to the length direction of the flexible strap body 1. This design allows the fastening block 13 to be stably fitted onto the flexible strap body 1. The limiting block 10 is located near the middle of the fastening frame 6, and there is a gap between it and the two sides of the fastening frame 10. The flexible strap body 1 passes through the gap on one side of the limiting block 10 and exits through the gap on the other side, forming an S-shaped guide channel. The gap formed between the limiting block 10 and the fastening frame 6 is interference-fitted with the flexible strap body 1, so that the fastening block 13 can slide relative to the flexible strap body 1 under the action of external force, and is fixed relative to the flexible strap body 1 after the external force is removed. This application, through the optimized structural design of the aforementioned buckle block 13, not only achieves a simple structure but also powerful functionality. The S-shaped guide channel design allows for more flexible and precise adjustment of the straps, enabling users to fine-tune the tightness of the straps according to their individual needs, achieving graded control of the pressure value, thereby meeting the personalized needs of different users. The interference fit design ensures the smoothness and stability of the buckle block 13 during adjustment, while effectively preventing accidental slippage during use, ensuring the fixation and protection of the protective gear. Furthermore, this buckle block 13 design improves the comfort and adaptability of the strap device, allowing the protective gear to better conform to the body's curves, reducing pressure and discomfort during wear, and enhancing the user experience.

[0041] In this embodiment, the first buckle connector 8 is disposed on the outer surface of the limiting block 10 on the side away from the flexible strap body 1, and a connection gap 15 is formed between the limiting head 14 of the first buckle connector 8 and the limiting block 10. In the example of this application, the first buckle connector 8 is designed on the limiting block 10, and a certain connection gap 15 is formed between the limiting head 14 of the first buckle connector 8 and the outer surface of the limiting block 10 on the side away from the flexible strap body 1, so that when the buckle block 13 is connected to the first connector 2, a stable connection can be achieved through the snapping of the first buckle connector 8 with the corresponding snapping groove 7. Specifically, when it is necessary to fix the buckle block 13 to the first connector 2, the user only needs to align the first buckle connector 8 with the snapping groove 7 and gently push it in until the limiting head 14 is completely snapped into the snapping groove 7, and a tight lock is achieved by using the connection gap 15. This not only simplifies the connection operation, but also improves the stability and reliability of the connection, ensuring that the buckle block 13 will not accidentally fall off during movement, thereby ensuring the continuous protective effect of the protective gear.

[0042] The first connector 2 is provided with a fastening part 11, and a fastening groove 7 is provided in the fastening part 11. The limiting head 14 of the first fastening connector 8 can pass through the fastening groove 7 and be limited by the fastening part 11. In the example of this application, the first connector 2 is provided with a fastening part 11, and a fastening groove 7 for the first fastening connector 8 to engage and snap is formed at the position of the fastening part 11. The outer contour dimension of the fastening groove 7 is smaller than the dimension of the limiting head 14 of the first fastening connector 8. The limiting head 14 can pass through the fastening groove 7 and be limited by it. The fastening groove 7 is engaged in the connection gap 15. This setting discloses a specific snapping form between the first fastening connector 8 and the first connector 2. When it is necessary to fix the fastening block 13 to the first connector 2, the user only needs to align the first fastening connector 8 on the fastening block 13 with the fastening groove 7 and gently push it in until the limiting head 14 passes through the fastening groove 7 and is then limited and fixed by the fastening part 11. During this process, the tight fit between the snap-fit ​​groove 7 and the limiting head 14 ensures the stability of the connection, while the limiting function of the snap-fit ​​part 11 effectively prevents the snap-fit ​​block 13 from accidentally falling off during the movement, simplifying the connection steps, improving operational efficiency, and ensuring the reliability and safety of the connection.

[0043] A deformation joint 12 is provided on the side of the fastening groove 7 near the flexible strap body 1, and the fastening groove 7 communicates with the deformation joint 12. This arrangement further optimizes the snap-fit ​​structure of the first fastening head 8 and the first connecting head 2. By providing a deformation joint 12 on the side of the fastening groove 7 near the flexible strap body 1, the fastening groove 7 can adapt to changes in external force, such as when the limiting head 14 of the fastening block 13 is inserted or pulled out, through the slight deformation of the deformation joint 12. Specifically, when the limiting head 14 is inserted into the fastening groove 7, the deformation joint 12 will open appropriately to accommodate the limiting head 14. Subsequently, under the limiting action of the fastening part, the deformation joint returns to its original shape, ensuring a stable connection of the fastening block 13. When it is necessary to release the fastening, external force is applied to the fastening block 13, and the deformation joint 12 opens again to allow the limiting head 14 to be pulled out smoothly. Preferably, the expansion joint 12 is designed in a straight line, and the length of the expansion joint 12 is greater than the length of the projection of the fastening groove 7 onto the fastening part 11.

[0044] Through the aforementioned optimized design, on the one hand, the smoothness and flexibility of the fastening operation are improved, enabling users to easily and quickly complete the fastening and unfastening actions, thus enhancing ease of use; on the other hand, the deformation buffering effect of the expansion joint 12 effectively reduces direct friction and impact between the fastening components, thereby reducing the risk of wear and damage to the components and extending the overall service life of the protective gear. Furthermore, this design enhances the stability and reliability of the fastening connection; even under vigorous exercise or prolonged use, the fastening block 13 is not prone to loosening or falling off, ensuring the continuous protective effect of the protective gear.

[0045] A receiving portion 4 is provided on the first connector 2 to accommodate the limiting head 14 after it passes through the fastening groove 7. In the example of this application, the receiving portion 4 is provided on the side after the fastening portion 11 is inserted on the first connector 2. Its main function is to receive and secure the limiting head 14 after it passes through the fastening groove 7. When the first fastening head 8 of the fastening block 13 is fastened to the first connector 2, the limiting head 14 first passes through the fastening groove 7, and then enters the receiving portion 4 and is tightly wrapped and limited therein. Preferably, the receiving portion 4 limits at least part of the edge of the limiting head 14 after fastening, which further improves the stability and reliability of the fastening connection, effectively prevents the fastening block 13 from accidentally falling off during movement, and at the same time, improves the aesthetics of the product by changing the exposed structure of the limiting head 14, making the protective gear more attractive in appearance. In the example of this application, the limiting head 14 of the first fastening connector 8 is circular, but it can also be designed in other ways, such as polygonal or irregular shapes. During installation, a connection gap 15 is formed between the limiting head 14 of the first fastening connector 8 and the limiting block 10, which allows the limiting head 14 to pass through the deformation joint 12 (a slit) and enter the receiving part 4 through the fastening groove 7. Under the restriction of the fastening part 11, it is stabilized in the receiving part 4. After the limiting head 14 is limited by the receiving part 4, the exposed structure of the first fastening connector 8 is semi-circular.

[0046] In this embodiment, the flexible strap body 1 uses an elastic tension band in at least a portion of its sections. The first connector 2 and the second connector 3 are fixed to the flexible strap body 1 by stitching or gluing. The first connector 2 and the second connector 3 are symmetrically arranged along the center line of the flexible strap body 1. The flexible strap can be woven from thermoplastic polyurethane elastomer or nylon material. The elastic tension band is part of the flexible strap. The flexible strap can be entirely made of elastic tension band or only partially made of elastic tension band. The elastic tension band is made of thermoplastic polyurethane elastomer.

[0047] The binding device described in this application addresses the current lack of modular pressure components in protective gear 5. First, the binding device described in this application can be fixed to the outside of the protective gear 5 as an extended functional component. Specifically, the second connector 3 at one end of the flexible binding body 1 is first fastened to the protective gear 5. Then, after the flexible binding body 1 wraps around the protective gear 5 once, the first connector 2 at the other end of the flexible binding body 1 is fastened to the first buckle 8. The first buckle 8 can be adjusted according to the position of the buckle block 13 relative to the flexible binding body 1, so that the flexible binding and the bottom protective gear 5 form a double locking mechanism. During strenuous exercise or complex movements, directional pressure is applied to the corresponding positions (such as the periphery of the patella and the attachment point of the Achilles tendon), effectively limiting the relative sliding between the protective gear 5 and the limb, improving dynamic protection effectiveness, and reducing the risk of secondary injury.

[0048] In addition, since this flexible bandage is installed by buckling, and with the position adjustment of the buckle block 13, the user does not need to replace the entire set of protective gear 5. After adjusting the position of the buckle block 13 on the flexible bandage according to the degree of limb swelling, muscle condition or rehabilitation stage, the first connector 2 is then buckled to it to accurately apply gradient pressure. Compared with the homogeneous pressure distribution of traditional protective gear 5, this system can specifically enhance the synergistic stability of the muscles around the joint, promote tissue fluid return, and avoid blood circulation disorders caused by excessive local compression, thus significantly improving physiological adaptability.

[0049] This device can be used independently as a light protective device or in conjunction with rigid protective gear 5 to enhance the level of protection. It is suitable for various scenarios such as sports protection, postoperative rehabilitation, and conservative treatment of osteoarthritis, significantly expanding the application boundaries of traditional protective gear 5.

[0050] Another embodiment of this utility model provides a protective gear 5, including the strapping device as described above. The protective gear 5 includes a back protector, knee pad, wrist guard, elbow pad, ankle protector, head protector, or neck protector.

[0051] A second fastener 9 is provided on the protective gear 5. The second connector 3 has the same structure as the first connector 2. The second fastener 9 is snapped into the fastening groove 7 on the second connector 3. The fastening groove 7 of the first connector 2 is connected to the first fastener 8 of the fastening block 13. The limiting head 14 of the first fastener 8 and the limiting head 14 of the second fastener 9 are circular. Their circular design has a guiding function, which facilitates their placement in the receiving part 4.

[0052] The strapping device and protective gear described in this application, through the structure of a flexible strap body 1, double connectors, and a sliding buckle block 13, achieves dual locking and graded pressure control between the protective gear and the strap. This solves the problems of traditional Velcro and complex buckles being prone to loosening during movement, cumbersome adjustment operations, and insufficient durability. The S-shaped threading channel design also makes the tightness adjustment of the strap more flexible and precise, thereby effectively improving the stability of the protective gear and its dynamic protective performance. At the same time, the relatively simple buckling structure avoids the introduction of too many complex components, reducing costs and the risk of failure. The buckle connection between the first connector and the buckle block 13 enables one-button operation and quick separation. During adjustment and disassembly, there is no need for repeated peeling or laborious buckling operations, which greatly improves the convenience of use and the overall user experience.

[0053] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A bandage device comprising a flexible bandage body (1) having a first connecting head (2) and a second connecting head (3) connected to both ends of the flexible bandage body (1) respectively, characterized in that: The second connecting head (3) is detachably connected to the protective gear (5) to which the flexible bandage is applied; A buckle block (13) is sleeved on the flexible bandage body (1), the buckle block (13) can slide or be fixed relative to the flexible bandage body (1), and the first connecting head (2) is detachably connected with the buckle block (13) to open or close the bandage device.

2. A strapping device according to claim 1, wherein: The buckle block (13) and the first connecting head (2) are buckled by the matched first buckle (8) and buckle groove (7).

3. A strapping device according to claim 2, wherein: The buckle block (13) comprises a buckle frame (6), a limiting block (10) is arranged at the middle position of the buckle frame (6), and a gap is arranged between the limiting block (10) and the buckle frame (6), the flexible bandage body (1) is inserted from the gap on one side of the limiting block (10) and is taken out from the gap on the other side.

4. A strapping device according to claim 3, wherein: The buckle frame (6) is arranged in a whole rectangular shape, the length direction of the buckle frame (6) is perpendicular to the length direction of the flexible bandage body (1), and the buckle frame (6) is integrally formed with the limiting block (10).

5. A strap arrangement according to claim 3, wherein: The first buckle (8) is arranged on the outer surface of the limiting block (10) away from the flexible bandage body (1), and a connecting gap (15) is formed between the limiting head (14) of the first buckle (8) and the limiting block (10).

6. A strap arrangement according to claim 3, wherein: The first connecting head (2) is provided with a buckle part (11), the buckle groove (7) is arranged on the buckle part (11), and the limiting head (14) of the first buckle (8) can pass through the buckle groove (7) and be limited by the buckle part (11).

7. A strap arrangement according to claim 3, wherein: The buckle groove (7) is provided with a deformation seam (12) close to one side of the flexible bandage, and the buckle groove (7) communicates with the deformation seam (12).

8. A strap arrangement according to claim 3, wherein: A containing part (4) is arranged on the first connecting head (2), and the containing part (4) is used to contain the limiting head (14) after passing through the buckle groove (7).

9. The strap apparatus of claim 1, wherein: The flexible bandage body (1) adopts an elastic tension belt at least in a part of sections, the first connecting head (2) and the second connecting head (3) are fixed with the flexible bandage body (1) by sewing or bonding, and the first connecting head (2) and the second connecting head (3) are symmetrically arranged along the center line of the flexible bandage body (1).

10. A guard characterized by: The bandage device comprises the protective gear (5) including a back protector, a knee protector, a wrist protector, an elbow protector, an ankle protector, a head protector or a neck protector, the second buckle (9) is arranged on the protective gear (5), the second buckle (9) is buckled with the buckle groove (7) arranged on the second connecting head (3), the buckle groove (7) of the first connecting head (2) is matched and buckled with the first buckle (8) of the buckle block (13), and the limiting head (14) of the first buckle (8) and the limiting head (14) of the second buckle (9) are circularly arranged.

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