Belt type air transportation binding and reinforcing device

Abstract

The utility model provides a belt type air transportation binding and reinforcing device. The device comprises a connecting steel belt; the connecting agraffe comprises an agraffe head and a connecting part, the agraffe head is used for being connected with a fastening point, and the connecting part is connected with one end of the connecting steel belt; the fastening device comprises a fastening bearing and a rotating disc, the fastening bearing penetrates through the rotating disc and is fixedly connected with the rotating disc, the end, away from the connecting agraffe, of the connecting steel belt is connected with the periphery of the fastening bearing so as to rotate along with the fastening bearing and be wound around the periphery of the fastening bearing, a pin hole is formed in the rotating disc, and the pin hole is communicated with the pin hole. The fixing part is used for fixing the fastener; when the fastening bearing of the fastener rotates, the connecting steel belt is wound around the periphery of the fastening bearing or leaves the fastening bearing, so that the fastening length of the connecting steel belt is changed. The tying effect of the binding and reinforcing equipment is guaranteed, and the practicability of the binding and reinforcing equipment is improved.

Description

Technical Field

[0001] This utility model relates to the field of stabilization technology, and in particular to a belt-type aviation transport stabilization and reinforcement device. Background Technology

[0002] Currently, there are several shortcomings in air transport lashing and securing equipment. Firstly, the connection points of existing belt-type air transport lashing and securing equipment are unstable, consisting of only one hook, making it prone to detachment during transport. Secondly, tightening and loosening the fine-tuning fasteners requires considerable operating space, making it difficult to secure cargo close to the bulkhead. Thirdly, the commonly used screw-type fastener wrench is directly connected to the fastener; its length and weight affect the securing effect, resulting in poor practicality. Utility Model Content

[0003] In view of this, the purpose of this utility model is to propose a belt-type air transport lashing and reinforcement device to solve the problem of poor practicality of belt-type air transport lashing and reinforcement devices.

[0004] To achieve the above objectives, this utility model provides a belt-type air transport strapping and reinforcement device, comprising:

[0005] Connecting steel strip;

[0006] A connecting hook includes a hook head and a connecting part, wherein the hook head is used to connect to a fastening point, and the connecting part is connected to one end of the connecting steel strip;

[0007] A fastener includes a fastening bearing and a turntable. The fastening bearing passes through the turntable and is fixedly connected to the turntable. One end of the connecting steel strip away from the connecting hook is connected to the periphery of the fastening bearing so as to rotate with the fastening bearing and wrap around the periphery of the fastening bearing. The turntable is provided with pin holes for fixing the fastener.

[0008] When the fastening bearing of the fastener rotates, the connecting steel strip is wound around the periphery of the fastening bearing or leaves the fastening bearing to change the fastening length of the connecting steel strip.

[0009] Furthermore, there are two connecting steel strips and two connecting hooks, with the two connecting hooks located on both sides of the fastener, and the free ends of the two connecting steel strips located on both sides of the fastener and connected to the connecting portions of the two connecting hooks respectively.

[0010] Furthermore, the connecting part includes a connecting platform and a connecting through hole connected to each other. The connecting through hole is connected to one side of the connecting platform, and the other side of the connecting platform is connected to the hook.

[0011] Furthermore, the hook head includes a hook body and a baffle. The hook body is located on the connecting platform. The hook body includes an opening. The baffle is adapted to the opening, located on the hook body, and rotatably connected to the hook body to open or close the opening.

[0012] Furthermore, the baffle and the hook body are rotatably connected by a torsion spring.

[0013] Furthermore, there are two turntables, located at both ends of the fastening bearing, with pin holes on the two turntables facing each other so that pins can pass through the pin holes on both turntables simultaneously to fix the fastener.

[0014] Furthermore, the turntable is evenly provided with multiple pin holes.

[0015] Furthermore, the binding and reinforcement equipment also includes a wrench, which is detachably connected to the end face of the fastening bearing.

[0016] Furthermore, the wrench has a Z-shaped structure, with one end connected to the fastening bearing and the other end being a free end.

[0017] Furthermore, the wrench includes a first L-shaped structure and a second L-shaped structure connected in sequence, and the first L-shaped structure and the second L-shaped structure are retractably connected.

[0018] As can be seen from the above description, the belt-type air transport lashing and securing device provided by this utility model, by setting up a connecting hook, a connecting steel belt, and a fastener, allows the lashing and securing device to connect to the securing point through the hook head, the connecting steel belt to the connecting part of the connecting hook, and to the fastening bearing of the fastener. The fastener's turntable can rotate the fastening bearing, allowing the connecting steel belt to continue winding or unwinding on the fastening bearing, thereby shortening or lengthening the distance between the connecting steel belt, the fastener, and the connecting hook, achieving the secure fastening of the lashing and securing device for the bundled goods. The connection between the connecting hook and the securing point enhances the connection stability between the lashing and securing device and the securing device, achieved through turntable rotation, reduces the operating space of the fastener while ensuring the securing effect of the lashing and securing device, thus improving its practicality. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the belt-type air transport binding and reinforcement equipment according to an embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the fastener structure according to an embodiment of the present invention. Figure 1 ;

[0022] Figure 3 This is a schematic diagram of the fastener structure according to an embodiment of the present invention. Figure 2 ;

[0023] Figure 4 This is a schematic diagram of the connecting hook structure according to an embodiment of the present utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the wrench according to an embodiment of the present utility model.

[0025] In the diagram: 10, connecting steel strip; 20, connecting hook; 21, hook head; 211, hook body; 2111, opening; 212, baffle; 22, connecting part; 221, connecting platform; 222, connecting through hole; 30, fastener; 31, fastening bearing; 32, turntable; 321, pin hole; 40, wrench; 41, first L-shaped structure; 42, second L-shaped structure. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0027] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this utility model should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0028] As described in the background section, current air transport lashing and securing equipment has several shortcomings. First, the connection points of current belt-type air transport lashing and securing equipment are unstable, consisting of only one hook, making it prone to detachment during transport. Second, tightening and loosening the fine-tuning fasteners requires considerable operating space, making it difficult to secure cargo close to the bulkhead. Third, commonly used screw-type fastener wrenches are directly connected to the fasteners; their length and weight affect the securing effect, resulting in poor practicality.

[0029] Based on this, this application proposes a belt-type air transport lashing and reinforcement device to solve the problem of poor practicality of existing belt-type air transport lashing and reinforcement devices.

[0030] The following describes the process in detail through one or more specific embodiments.

[0031] This application provides a belt-type air transport strapping and reinforcement device, such as... Figure 1 , Figure 2 and Figure 3 Shown, including:

[0032] Connecting steel strip 10;

[0033] The connecting hook 20 includes a hook head 21 and a connecting part 22. The hook head 21 is used to connect to the fixing point, and the connecting part 22 is connected to one end of the connecting steel strip 10.

[0034] The fastener 30 includes a fastening bearing 31 and a turntable 32. The fastening bearing 31 passes through the turntable 32 and is fixedly connected to the turntable 32. One end of the connecting steel strip 10 away from the connecting hook 20 is connected to the periphery of the fastening bearing 31 so as to rotate with the fastening bearing 31 and wrap around the periphery of the fastening bearing 31. The turntable 32 is provided with a pin hole 321 for fixing the fastener 30.

[0035] When the fastening bearing 31 of the fastener 30 rotates, the connecting steel strip 10 is wound around the periphery of the fastening bearing 31 or leaves the fastening bearing 31 to change the fastening length of the connecting steel strip 10.

[0036] Specifically, the connecting steel strap 10 connects the connecting hook 20 and the fastener 30, forming the main structure of the binding and securing equipment. The connecting hook 20 is used to connect with the fastening point, and the fastener 30 is used to adjust the connecting length of the connecting steel strap 10, that is, to adjust the length of the binding and securing equipment, so as to fasten or unfasten the binding and securing equipment, thereby adjusting the binding and securing effect of the binding and securing equipment on the goods it is binding.

[0037] The fastener 30 includes a fastening bearing 31 and a turntable 32. The turntable 32 is coaxially and fixedly connected to the fastening bearing 31. When the turntable 32 is rotated, the fastening bearing 31 also rotates. Correspondingly, when the fastening bearing 31 rotates, the turntable 32 also rotates. The turntable 32 is provided with a pin hole 321 to fix the turntable 32 through the pin hole 321, preventing the turntable 32 and the fastening bearing 31 from rotating, thereby fixing the fastener 30. The fastener 30 occupies little space, which helps to improve the practicality of the binding and reinforcement equipment.

[0038] It should be noted that the pin can be fixed by passing through the pin hole 321 and any other fixed hole at the same time, thereby preventing the turntable 32 and the fastening bearing 31 from rotating under the action of external force, and achieving the effect of fixing the fastener 30.

[0039] One end of the connecting steel strip 10 is fixedly connected to the connecting portion 22 of the connecting hook 20, and the other end is connected to the fastening bearing 31. It is wound around the periphery of the fastening bearing 31 so that when the fastening bearing 31 rotates, the connecting steel strip 10 rotates with the fastening bearing 31 to continue winding around the periphery of the fastening bearing 31, shortening the distance between the connecting steel strip 10 and the fastener 30 and the connecting hook 20, thereby shortening the length of the binding and reinforcing equipment; and then it is unwound from the periphery of the fastening bearing 31, thereby extending the distance between the connecting steel strip 10 and the fastener 30 and the connecting hook 20, and extending the length of the binding and reinforcing equipment.

[0040] It should be noted that the end of the connecting steel strip 10 that is connected to the fastening bearing 31 is arranged parallel to the axial direction of the fastening bearing 31 so that the connecting steel strip 10 can be stably wound around the periphery of the fastening bearing 31.

[0041] In this embodiment, by providing a connecting hook 20, a connecting steel strap 10, and a fastener 30, the binding and securing device is connected to the anchoring point via the hook head 21 of the connecting hook 20. The connecting steel strap 10 is connected to the connecting part 22 of the connecting hook 20 and wound around the fastening bearing 31 of the fastener 30. The fastening bearing 31 can be rotated via the turntable 32 of the fastener 30, allowing the connecting steel strap 10 to continue winding or unwinding on the fastening bearing 31, thereby shortening or lengthening the distance between the connecting steel strap 10 and the fastener 30 and the connecting hook 20, thus achieving the secure binding and securing of the goods. The connection between the connecting hook 20 and the anchoring point enhances the connection stability between the binding and securing device and the anchoring point. The fastener 30 achieves fastening via the rotation of the turntable 32, reducing the operating space of the fastener 30 while ensuring the securing effect of the binding and securing device, thus improving its practicality.

[0042] In some embodiments, as Figure 1 As shown, both the connecting steel strip 10 and the connecting hook 20 include two. The two connecting hooks 20 are located on both sides of the fastener 30, and the free ends of the two connecting steel strips 10 are located on both sides of the fastener 30 and are respectively connected to the connecting portions 22 of the two connecting hooks 20.

[0043] Specifically, the fastener 30 connects two connecting steel straps 10, and the two connecting steel straps 10 are respectively connected to two connecting hooks 20, so that both ends of the binding and securing device are connecting hooks 20, so as to facilitate the connection and securing point. The fastener 30 is located in the middle of the binding and securing device, and can tighten or loosen the connecting steel straps 10 to adjust the securing effect of the binding and securing device on the bound goods, thereby improving the practicality and ease of use of the binding and securing device.

[0044] In some embodiments, as Figure 4 As shown, the connecting part 22 includes a connecting platform 221 and a connecting through hole 222 connected to each other. The connecting through hole 222 is connected to one side of the connecting platform 221, and the other side of the connecting platform 221 is connected to the hook head 21.

[0045] Specifically, the connecting part 22 includes a connecting platform 221 and a connecting through hole 222. The connecting through hole 222 is used to connect with the connecting steel strip 10. The connecting platform 221 is used to connect the hook head 21 and the connecting through hole 222. The connecting steel strip 10 is connected to the connecting part 22 through the connecting through hole 222. One end of the connecting steel strip 10 that connects to the connecting through hole 222 is provided with a connecting ring. The connecting through hole 222 passes through the connecting ring and connects to the connecting steel strip 10.

[0046] It should be noted that the connecting steel strip 10 can be folded, with one end being a loop and the other end having two free ends. The loop end is used to pass through the connecting through hole 222 and connect to the connecting through hole 222, while the end with two free ends is fixedly connected to the fastening bearing 31, thereby enhancing the stability of the connection between the connecting steel strip 10, the fastening bearing 31, and the connecting hook 21.

[0047] In this embodiment, the connecting steel strip 10 is connected to the connecting part 22 through the connecting through hole 222, which improves the connection stability between the connecting steel strip 10 and the connecting part 22, thereby improving the fastening stability of the binding and reinforcement equipment and enhancing its practicality.

[0048] In some embodiments, the hook head 21 includes a hook body 211 and a baffle 212. The hook body 211 is located on the connecting platform 221. The hook body 211 includes an opening 2111. The baffle 212 is adapted to the opening 2111, located on the hook body 211, and rotatably connected to the hook body 211 to open or close the opening 2111.

[0049] Specifically, the hook body 211 of the hook head 21 is connected to the connecting platform 221 of the connecting part 22. The hook body 211 has an opening 2111. The baffle 212 is located at the opening 2111 and one end is rotatably connected to the hook body 211 to cover the opening 2111 or uncover the opening 2111.

[0050] When the hook head 21 is connected to the fastening point (non-standard fastening point: eye plate, eye ring, grounding ring, etc.; semi-standard fastening point: fastening groove seat, foldable grounding ring, etc.), the baffle 212 is rotated, and the opening 2111 is exposed. The fastening point is connected to the hook body 211 through the opening 2111. Then, the baffle 212 is rotated to close the opening 2111, preventing the fastening point from leaving the hook body 211 through the opening 2111, thereby improving the connection stability between the hook head 21 and the fastening point.

[0051] In this embodiment, the hook body 211 and baffle 212 of the hook head 21 facilitate the connection between the hook head 21 and the fastening point, and also ensure the connection stability between the hook head 21 and the fastening point, thereby improving the reinforcement stability and practicality of the binding and reinforcement equipment.

[0052] In some embodiments, the baffle 212 and the hook body 211 are rotatably connected by a torsion spring.

[0053] Specifically, the torsion spring has a structure that restores its original shape. The baffle 212 and the hook body 211 are rotatably connected by the torsion spring, which can ensure the rotatable connection between the baffle 212 and the hook body 211. It can also keep the baffle 212 closed on the opening 2111 of the hook body 211, thus preventing the hook head 21 from being disconnected from the fastening point through the opening 2111 due to user operation errors.

[0054] When connecting the hook 21 to the fastening point, the fastening point is released from the baffle 212. The hook 21 is pressed down, and the torsion spring, under the force of the pressing force, drives the baffle 212 to rotate until the opening 2111 is exposed. The fastening point is then connected to the hook body 211. After releasing the pressing force on the hook 21, the torsion spring, under its own torque force, drives the baffle 212 to rotate back to close the opening 2111. This prevents the hook 21 from being disconnected from the fastening point through the opening 2111, improving the ease of connection of the hook 20 and thus enhancing the practicality of the binding and reinforcement equipment.

[0055] In some embodiments, there are two turntables 32, located at both ends of the fastening bearing 31 respectively. The pin holes 321 on the two turntables 32 are arranged opposite to each other so that the pins can pass through the pin holes 321 on the two turntables 32 at the same time to fix the fastener 30.

[0056] Specifically, the fastener 30 includes two turntables 32, and the fastening bearing 31 passes through both turntables 32 and is coaxially fixedly connected to both turntables 32. When one turntable 32 is rotated, the other turntable 32 and the fastening bearing 31 also rotate. The pin holes 321 on the two turntables 32 are arranged opposite to each other so that the pins pass through the pins on the two turntables 32 at the same time, thus completing the fixation of the fastener 30 and preventing the fastener 30 from rotating and affecting the binding and reinforcement equipment.

[0057] In this embodiment, the arrangement of the two turntables 32 allows the fastener 30 to be fixed by a pin, avoiding the need to find a hole when fixing the fastener 30, thereby improving the applicability of the fastener 30 and enhancing the practicality of the binding and reinforcement equipment.

[0058] In some embodiments, the turntable 32 is provided with a plurality of pin holes 321 evenly distributed on it.

[0059] Specifically, the fastener 30 can be fixed by passing a pin through a pin hole 321. The turntable 32 is provided with multiple pin holes 321 to avoid the situation where it can only be fixed through one pin hole 321, thereby improving the practicality of the fastener 30 and thus improving the practicality of the binding and reinforcement equipment.

[0060] In some embodiments, as Figure 1 and Figure 5 As shown, the binding and reinforcement equipment also includes a wrench 40, which is detachably connected to the end face of the fastening bearing 31.

[0061] Specifically, the wrench 40 is connected to the end face of the fastening bearing 31 to drive the fastening bearing 31 to rotate, thereby enabling the fastener 30 to rotate and thus tightening and loosening the binding and reinforcing equipment. The wrench 40 facilitates the rotation of the fastener 30, improves the practicality of the fastener 30, and thus improves the practicality of the binding and reinforcing equipment.

[0062] The wrench 40 is detachably connected to the fastening bearing 31, allowing the wrench 40 to simultaneously adjust the fasteners 30 of multiple binding and reinforcement devices, thereby reducing the cost of the binding and reinforcement devices.

[0063] It should be noted that the end of the wrench 40 connected to the end face of the fastening bearing 31 is a groove adapted to the end face of the fastening bearing 31. When the wrench 40 is fitted onto the end face of the fastening bearing 31, it is connected to the end face of the fastening bearing 31 and drives the fastening bearing 31 to rotate. When the wrench 40 moves away from the end face of the fastening bearing 31 along the length direction of the fastening bearing 31, it is disconnected from the fastening bearing 31.

[0064] The end face of the fastening bearing 31 is a polygonal structure, and the inner wall of the groove provided on the wrench 40 is a polygonal structure adapted to the end face of the fastening bearing 31.

[0065] In some embodiments, the wrench 40 has a Z-shaped structure, with one end connected to the fastening bearing 31 and the other end being a free end.

[0066] Specifically, the wrench 40 is configured with a Z-shaped structure, allowing the user to rotate the wrench 40 through its free end, further improving the ease of rotation of the wrench 40 and enhancing the practicality of the fastener 30.

[0067] In some embodiments, the wrench 40 includes a first L-shaped structure 41 and a second L-shaped structure 42 connected in sequence, the first L-shaped structure 41 and the second L-shaped structure 42 being retractably connected.

[0068] Specifically, the first L-shaped structure 41 and the second L-shaped structure 42 are telescopically connected, that is, the length of the wrench 40 is telescopic. The telescopic length of the wrench 40 can improve the environmental adaptability of the fastener 30, thereby improving the practicality of the fastener 30 and benefiting the practicality of the binding and reinforcement equipment.

[0069] The retractable connection structure of the wrench 40 is described in detail below:

[0070] One end of the first L-shaped structure 41 is a free end, and the other end is a first connecting end. One end of the second L-shaped structure 42 is connected to the fastening bearing 31, and the other end is a second connecting end. The first connecting end is sleeved around the second connecting end. The first connecting end has multiple holes along its length, and the second connecting end has an elastic protrusion along its length, which is located within one of the holes. The first L-shaped structure 41 and the second L-shaped structure 42 are connected. When adjusting the length of the wrench 40, the elastic protrusion is pressed, causing it to disengage from one of the holes. Then, the first connecting end is moved so that the elastic protrusion faces another hole and is located within that hole, thus adjusting the length of the wrench 40.

[0071] This application has the following beneficial effects:

[0072] ①Increases compatibility with cargo and ships: The cargo connection end can connect to the mooring points of non-standard and semi-standard cargo, while the ship mooring end can be fixed to ship structures such as eye plates, eye rings, mooring slots, and foldable anchors, thus increasing the applicability of portable mooring equipment.

[0073] ② Reduce the production cost of fastening equipment: The fastener 30 and the wrench 40 are separate, and one wrench 40 can fasten multiple connecting steel strips 10. Moreover, by adjusting the length of the wrench 40, it can be used in various operating environments.

[0074] ③ Improved operability and economy: The connecting hook 20, fastener 30, and wrench 40 are lightweight, allowing two people to operate simultaneously from both ends, shortening the tightening time and improving equipment securing efficiency and safety. Furthermore, changing the plane of the tightening operation reduces the space requirements for the operation.

[0075] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the scope of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of this utility model as described above, which are not provided in the details for the sake of brevity.

[0076] The embodiments of this utility model are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A type of belt-type air transport strapping and reinforcement equipment, characterized in that, include: Connecting steel strip; A connecting hook includes a hook head and a connecting part, wherein the hook head is used to connect to a fastening point, and the connecting part is connected to one end of the connecting steel strip; A fastener includes a fastening bearing and a turntable. The fastening bearing passes through the turntable and is fixedly connected to the turntable. One end of the connecting steel strip away from the connecting hook is connected to the periphery of the fastening bearing so as to rotate with the fastening bearing and wrap around the periphery of the fastening bearing. The turntable is provided with pin holes for fixing the fastener. When the fastening bearing of the fastener rotates, the connecting steel strip is wound around the periphery of the fastening bearing or leaves the fastening bearing to change the fastening length of the connecting steel strip.

2. The belt-type air transport strapping and reinforcement equipment according to claim 1, characterized in that, The connecting steel strip and the connecting hook each include two, with the two connecting hooks located on both sides of the fastener, and the free ends of the two connecting steel strips located on both sides of the fastener and connected to the connecting parts of the two connecting hooks respectively.

3. The belt-type air transport strapping and reinforcement equipment according to claim 1, characterized in that, The connecting part includes a connecting platform and a connecting through hole connected to each other. The connecting through hole is connected to one side of the connecting platform, and the other side of the connecting platform is connected to the hook.

4. The belt-type air transport strapping and reinforcement equipment according to claim 3, characterized in that, The hook head includes a hook body and a baffle. The hook body is located on the connecting platform. The hook body includes an opening. The baffle is adapted to the opening, located on the hook body, and rotatably connected to the hook body to open or close the opening.

5. The belt-type air transport strapping and reinforcement equipment according to claim 4, characterized in that, The baffle and the hook body are rotatably connected by a torsion spring.

6. The belt-type air transport strapping and reinforcement equipment according to claim 1, characterized in that, The turntable is provided in two places, located at both ends of the fastening bearing. The pin holes on the two turntables are arranged opposite each other so that the pins can pass through the pin holes on the two turntables at the same time to fix the fastener.

7. The belt-type air transport strapping and reinforcement equipment according to claim 1, characterized in that, The turntable is evenly provided with multiple pin holes.

8. The belt-type air transport strapping and reinforcement equipment according to claim 1, characterized in that, It also includes a wrench, which is detachably connected to the end face of the fastening bearing.

9. The belt-type air transport strapping and reinforcement equipment according to claim 8, characterized in that, The wrench has a Z-shaped structure, with one end connected to the fastening bearing and the other end being a free end.

10. The belt-type air transport strapping and reinforcement equipment according to claim 9, characterized in that, The wrench includes a first L-shaped structure and a second L-shaped structure connected in sequence, and the first L-shaped structure and the second L-shaped structure are retractably connected.

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