Large cargo fixer

Abstract

The utility model belongs to the technical field of railway cargo transportation equipment for traffic transportation, and particularly discloses a large cargo fixer. Comprising a supporting piece which is detachably arranged on a frame, and an adjusting assembly is arranged on the supporting piece; the sliding block is movably arranged in the sliding groove in the supporting piece and matched with the adjusting assembly, and a pre-tightening force mechanism is further arranged on the sliding block; and the restraining mechanism is detachably installed between the two sliding blocks on the same supporting piece, is tightly pressed on the surface of the goods and is matched with the pre-tightening force mechanism. By arranging the adjusting assembly, the pre-tightening force mechanism and the restraining mechanism, prestress relaxation can be effectively avoided, long-term stability of fixing force is guaranteed, and use safety is guaranteed. The problems that an existing cargo fixing device is poor in size adaptability, low in universality, insufficient in structural stability, prone to fixing failure, difficult in pretightening force maintaining, not lasting in fixing effect, complex in operation, insufficient in safety and convenience and the like are solved.

Description

Technical Field

[0001] This utility model belongs to the technical field of railway freight transport equipment, specifically, it relates to a large cargo fixing device. Background Technology

[0002] With the rapid development of the logistics and transportation industry, cargo securing devices are widely used in road, rail, air, and warehousing scenarios, and their performance is crucial to transportation safety and efficiency. However, existing devices are mostly designed for small and medium-sized goods, with simple structures and limited adjustment capabilities. When dealing with large, heavy, or irregularly shaped goods, the following problems often arise:

[0003] 1. Poor size adaptability and low versatility;

[0004] Existing large cargo securing equipment is mostly designed with fixed dimensions, and the slider spacing cannot be flexibly adjusted according to the cargo size, resulting in it only being able to accommodate cargo of specific specifications. For example, the connection structure between the support and the slider is fixed, lacking adjustment components such as bidirectional screws, making it impossible to adjust the slider spacing through simple operation. This limits the equipment's adaptability to cargo of various sizes, requiring the fixing device to be replaced for different cargoes, resulting in high operating costs and low efficiency.

[0005] 2. Insufficient structural stability; fixation is prone to failure.

[0006] The connection between the slider and the support lacks effective guidance and anti-detachment design, making it prone to displacement or detachment during movement. Some devices connect the slider to the support only through a simple snap-fit ​​mechanism, lacking a dual guiding structure of slots and plates, causing the slider to easily deviate from its trajectory during sliding. Furthermore, the absence of convenient installation designs such as snap-fit ​​joints makes the slider prone to detachment due to vibration or stress after assembly, resulting in poor stability during fixing and posing a safety hazard of loosening goods.

[0007] 3. It is difficult to maintain the preload, and the fixing effect is not long-lasting;

[0008] An imperfect pretension adjustment mechanism or a lack of one-way locking function can cause the restraint straps to loosen easily due to vibration. For example, some equipment relies on manual tightening for restraint strap adjustment, lacking a linkage design between the rolling roller and ratchet, making it impossible to maintain prestress continuously through mechanical structure; at the same time, the absence of a locking block and torsion spring reset locking mechanism allows the ratchet to easily rotate in the opposite direction, causing the pretension to gradually be lost, requiring frequent manual adjustments, and making it difficult to maintain the fixing effect in the long term.

[0009] 4. The operation is complex, and the safety and convenience are insufficient;

[0010] Relying on complex tools or electric operation, the locking mechanism is unreliable, increasing the difficulty of use. Some devices require special tools to adjust the slider spacing or tighten the restraint straps, making the operation cumbersome; at the same time, insufficient structural strength (such as non-steel structures for support components) or unreasonable design (such as unreliable restraint strap connections) makes them prone to breakage during transportation due to vibration or stress, posing safety hazards. In addition, the lack of an automatic pre-tension holding function requires continuous manual force application, further reducing ease of use.

[0011] Based on this, the present invention provides a large cargo fixation device to solve the problems existing in the prior art. Utility Model Content

[0012] In view of this, the main purpose of this utility model is to provide a large cargo fastener to solve the problems of poor size adaptability, low versatility, insufficient structural stability, easy failure of fastening, difficulty in maintaining pre-tightening force, short-lasting fastening effect, complicated operation, and insufficient safety and convenience of current cargo fastening devices.

[0013] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0014] A large cargo fastener, comprising:

[0015] The support component is detachably mounted on the frame and has an adjustment mechanism.

[0016] The slider is movably set in a groove on the support, matches the adjustment component, and a preload mechanism is also provided on the slider;

[0017] The restraint mechanism, detachably mounted between two sliders on the same support, presses tightly against the surface of the cargo and is matched with the preload mechanism.

[0018] In a preferred embodiment, the support member comprises an integrally formed:

[0019] Main steel components;

[0020] Two wing plates are symmetrically arranged on both sides of the main steel component, and mounting holes are provided on the wing plates to match the positioning bolts.

[0021] In a preferred embodiment, the slide is a trapezoidal slide provided on the main steel component, and the main steel component is also provided with a locking port communicating with the slide.

[0022] In a preferred embodiment, the adjustment component includes:

[0023] A bidirectional screw is rotatably mounted on a support and passes through a trapezoidal groove, with its two ends threadedly connected to two sliders respectively;

[0024] The adjusting block is fixedly installed at one end of the bidirectional screw and located on the outside of the support.

[0025] In a preferred embodiment, a locking block is provided at the bottom of the slider, and the locking block engages in a trapezoidal groove on the main steel component; a slot is formed on the upper side of the locking block, and the slot corresponds to a locking plate provided on the upper side of the groove.

[0026] In a preferred embodiment, the restraint mechanism includes a high-strength flexible restraint band, with buckles at both ends of the restraint band. The buckles are J-shaped and have a bent buckle structure at the lower end.

[0027] In a preferred embodiment, the preload mechanism includes:

[0028] The adjusting component is rotatably mounted in the U-shaped slot at the upper end of the slider and extends through the slot;

[0029] The rolling roller is rotatably mounted in the U-shaped slot via an adjusting component;

[0030] The ratchet is coaxially mounted with the rolling roller and fixedly connected to one end of the rolling roller.

[0031] In a preferred embodiment, a positioning groove is provided on the rolling roller along its length, and the positioning groove matches the lower end snap-fit ​​structure of the snap-fit ​​component.

[0032] In a preferred embodiment, the ratchet is a one-way ratchet that matches the locking block, which is rotatably disposed inside one side plate of the U-shaped slot at the upper end of the slider.

[0033] In a preferred embodiment, the locking block is rotatably mounted on the inner side of one side plate of the U-shaped slot at the upper end of the slider via a connecting shaft, and a torsion spring is provided on the inner side of the locking block, with the other end of the torsion spring fixedly connected to the same side plate of the U-shaped slot.

[0034] Compared with the prior art, this utility model provides a large cargo fixing device with the following advantages:

[0035] 1. The support components adopt a detachable steel structure, which can be flexibly installed on different frames; with the two-way screw and slider thread linkage of the adjustment component, the slider spacing can be precisely adjusted by rotating the adjustment block, which can adapt to large goods of various sizes, solve the problems of fixed size and poor adaptability of traditional fixing devices, and significantly improve the versatility of the equipment;

[0036] 2. A locking block is set at the bottom of the slider to engage with the trapezoidal slide groove. At the same time, the slot on the upper side of the locking block and the locking plate on the upper side of the slide groove form a double guide and limiting structure. This ensures that the slider slides in a straight line along the slide groove, and the locking design prevents the slider from coming off due to vibration or force, which greatly improves the stability of the movement and avoids the risk of fixation failure caused by slider displacement during the fixing process.

[0037] 3. The restraint mechanism utilizes a high-strength, flexible restraint band, reliably connected to the positioning groove of the rolling roller via a buckle. When the rotating adjustment component drives the rolling roller, the restraint band is tightened and prestressed, directly pressing against the surface of the goods. Combined with the linkage design of the one-way ratchet and locking block, prestress relaxation is effectively prevented, ensuring long-term stable fixing force and preventing goods from loosening due to vibration during transportation.

[0038] 4. The overall structure achieves its function through mechanical linkage. The bidirectional screw of the adjustment component and the rolling roller of the pre-tightening mechanism are all manually operated, requiring no complex tools or electrical support. Simultaneously, the ratchet's one-way locking mechanism automatically maintains the pre-stress state, reducing the need for continuous manual force application and lowering the operational difficulty. Furthermore, the combination of steel structure support components and high-strength restraint straps balances strength and lightweight design, further enhancing safety. This solution addresses the problems of current cargo securing devices, including poor dimensional adaptability, low versatility, insufficient structural stability, easy fixation failure, difficulty in maintaining pre-tightening force, short-lasting fixation effect, complex operation, and insufficient safety and convenience. Attached Figure Description

[0039] 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 from these drawings without creative effort.

[0040] Figure 1 This is an installation effect diagram of the large cargo fixing device of this utility model;

[0041] Figure 2 This is a schematic diagram of the structure of the large cargo fixing device of this utility model;

[0042] Figure 3 This is an exploded view of the large cargo fixing device of this utility model;

[0043] Figure 4 This utility model Figure 3 A magnified view of a section at point A in the middle;

[0044] Figure 5 This utility model Figure 3 A magnified view of a section at point B in the middle;

[0045] Figure 6 This is a schematic diagram of the structure of the buckle component of this utility model;

[0046] Figure 7 This is a cross-sectional view of the preload mechanism of this utility model;

[0047] Figure 8 This is a side view of the preload mechanism of this utility model.

[0048] [Explanation of Key Component Symbols]

[0049] 1. Cargo; 2. Chassis; 3. Supporting components; 31. Main steel components; 32. Wing plate; 33. Slide groove; 34. Clamping joint; 4. Adjustment assembly; 41. Adjusting block; 42. Double-acting screw; 5. Slider; 51. Clamping block; 52. Clamping groove; 6. Restraint mechanism; 61. Restraint belt; 62. Buckle; 7. Pre-tightening mechanism; 71. Adjusting component; 72. Rolling roller; 721. Positioning groove; 73. Ratchet; 74. Locking block; 75. Torsion spring; 8. Positioning bolt. Detailed Implementation

[0050] The structure of the large cargo fixing device will be further described in detail below with reference to the accompanying drawings and embodiments of this utility model.

[0051] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0052] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments as described in this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0053] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0054] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0055] As per the instruction manual Figures 1-8 As shown, this utility model provides a technical solution:

[0056] A large cargo fastener, mounted on a vehicle frame 2, is used to secure large cargo 1. It includes a support member 3, sliders 5, and a restraint mechanism 6. The support member 3 is a detachable steel structure mounted on the vehicle frame 2, serving as the main support and fixing element to bear the cargo 1. An adjustment component 4 is provided on the support member 3. The sliders 5 are movably mounted within a groove 33 on the support member 3, cooperating with the adjustment component 4 to adjust the relative positions of adjacent sliders 5. This allows the spacing of the sliders 5 to adapt to the fixing requirements of cargo 1 of different sizes, providing a basic positioning for subsequent restraint. A pre-tightening mechanism 7 is also provided on the sliders 5. The restraint mechanism 6 is detachably connected between two sliders 5 on the same support member 3 and works in conjunction with the pre-tightening mechanism 7. In use, the tightness of the restraint mechanism 6 is adjusted by the pre-tightening mechanism 7, causing the restraint mechanism 6 to press firmly against the surface of the cargo 1. The pre-tightening force secures the cargo 1 stably, ensuring its safety during transportation.

[0057] In a preferred embodiment, such as Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, the support member 3 includes an integrally formed main steel member 31 and two wing plates 32. The two wing plates 32 are symmetrically arranged on both sides of the main steel member 31, and mounting holes are provided on the wing plates 32 to cooperate with the positioning bolts 8. In use, the support member 3 is fixed to the frame 2 by the connection between the positioning bolts 8 and the wing plates 32. The slide groove 33 is a trapezoidal slide groove provided on the main steel member 31, and the main steel member 31 is also provided with a locking port 34 communicating with the slide groove 33. In use, the slider 5 is installed in the slide groove 33 through the locking port 34. During installation, the slider 5 is conveniently installed into the slide groove 33 through the locking port 34. The design of the trapezoidal slide groove 33 can not only ensure the smooth movement of the slider 5, but also prevent the slider 5 from falling out through shape constraint, providing a reliable basic structure for subsequent adjustment and fixing of goods.

[0058] In a preferred embodiment, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the adjustment component 4 includes an adjustment block 41 and a bidirectional screw 42. The bidirectional screw 42 is rotatably mounted on the main steel part 31 and passes through the trapezoidal slide groove 33. Its two ends are threadedly connected to two sliders 5 respectively. By rotating the bidirectional screw 42, the two sliders 5 can be driven to move towards or away from each other along the slide groove 33, thereby achieving precise adjustment of the distance between the sliders 5 to adapt to the fixing requirements of goods 1 of different sizes. The adjustment block 41 is fixedly connected to one end of the bidirectional screw 42 and is located on the outside of the main steel part 31. In use, the bidirectional screw 42 can be rotated by manually rotating the adjustment block 41, thereby controlling the movement direction and distance of the sliders 5. This design makes the position adjustment of the sliders 5 simple and can maintain the stability after adjustment through the self-locking property of the threaded transmission, ensuring the fixing effect of the constraint mechanism 6 on the goods 1.

[0059] In a preferred embodiment, such as Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, a locking block 51 is provided at the bottom of the slider 5. The locking block 51 directly engages with the trapezoidal groove 33 of the main steel component 31. The shape constraint of the groove 33 achieves the initial connection between the slider 5 and the support component 3. A locking groove 52 is formed on the upper side of the locking block 51. The position of the locking groove 52 corresponds to the locking plate provided on the upper side of the groove 33. The two form a locking and guiding mechanism through structural cooperation. By tightly fitting the locking groove 52 with the locking plate on the upper side of the groove 33, when the slider 5 moves along the groove 33, the locking plate is embedded in the locking groove 52 to form a lateral limit. This ensures that the slider 5 can only slide along the length direction of the groove 33, and also prevents the slider 5 from falling out of the groove 33 due to vibration or force through the locking structure. This provides structural protection for the stable movement of the slider 5 and the reliable fixation of the subsequent constraint mechanism 6.

[0060] In a preferred embodiment, such as Figure 1 , Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the constraint mechanism 6 includes a high-strength flexible constraint band 61. Both ends of the constraint band 61 are equipped with buckles 62. The buckles 62 have a J-shaped structure design, with a bent buckle structure at the lower end. These buckles match the positioning groove 721 on the rolling roller 72 in the pre-tensioning mechanism 7. The buckles engage with the positioning groove 721, achieving a reliable connection between the constraint band 61 and the rolling roller 72. In use, the buckles at the lower end of the buckles 62 are inserted into the positioning groove 721 of the rolling roller 72. Rotating the rolling roller 72 moves the constraint band 61. As the rolling roller 72 rotates, the constraint band 61 is gradually tightened and pre-stressed. This pre-stress is transmitted to the surface of the cargo 1 through the constraint band 61, causing the constraint mechanism 6 to press firmly against the cargo 1, thereby achieving pre-tensioning and securing the cargo 1 and ensuring its stability during transportation.

[0061] In a preferred embodiment, such as Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 7 and Figure 8 As shown, the prestressing mechanism 7 includes an adjusting member 71, a rolling roller 72, a ratchet 73, and a locking block 74. The adjusting member 71 is rotatably mounted in a U-shaped groove at the upper end of the slider 5 and extends through the groove, serving as the mounting shaft for the rolling roller 72. The rolling roller 72 is rotatably mounted in the U-shaped groove via the adjusting member 71, and its end is fixedly connected to the ratchet 73, enabling the rolling roller 72 and ratchet 73 to rotate synchronously, forming the core structure for prestress transmission. The ratchet 73 is a one-way ratchet and works in conjunction with the locking block 74. When the rolling roller 72 is rotated via the adjusting member 71, the ratchet 73 rotates in one direction. The locking block 74 prevents the ratchet 73 from rotating in the opposite direction, thus maintaining the rotation direction of the rolling roller 72 when prestress is applied, ensuring that the restraint band 61 is continuously tightened. This design allows the prestress to be applied stably and maintained for a long time, avoiding prestress relaxation due to vibration or reverse rotation, ultimately achieving reliable fixation of the cargo 1 through the restraint mechanism 6.

[0062] Specifically, the locking block 74 is rotatably mounted on the inner side of one side plate of the U-shaped slot at the upper end of the slider 5 via a coupling shaft. A torsion spring is connected to the inner side of the locking block 74 and to the side plate of the U-shaped slot, which is used to reset the locking block 74 after it rotates. The other end of the torsion spring is fixedly connected to the same side plate of the U-shaped slot. When the ratchet 73 rotates, the locking block 74 rotates at a small angle with the movement of the teeth of the ratchet 73. At this time, the torsion spring is stretched or compressed and stores elastic potential energy. When the ratchet 73 stops rotating or attempts to rotate in the opposite direction, the torsion spring releases its elastic potential energy, driving the locking block 74 to reset to its initial position, allowing it to re-engage between the teeth of the ratchet 73, thus achieving one-way locking of the ratchet 73 and ensuring the stability of the preload mechanism 7 when applying or maintaining prestress.

[0063] The usage process and operating principle of the large cargo fastener described in this utility model include:

[0064] Usage: When using this large cargo fastener, first, fix the support 3 to the designated position on the frame 2 by connecting it with the positioning bolt 8 through the mounting hole on the wing plate 32; then, rotate the bidirectional screw 42 by adjusting the block 41 to drive the two sliders 5 to move towards or away from each other along the trapezoidal slide groove 33 of the main steel part 31, adjusting the distance to match the size of the cargo 1; insert the slider 5 into the slide groove 33 through the locking port 34, and the locking block 51 at its bottom engages with the slide groove 33, and the locking groove 52 and the locking plate on the upper side of the slide groove 33 form a guide limit to ensure that the slider 5 slides stably. Next, the lower ends of the buckles 62 at both ends of the high-strength flexible restraint band 61 of the restraint mechanism 6 are snapped into the positioning grooves 721 of the rolling roller 72 in the pre-tightening mechanism 7 on the slider 5. Finally, the rolling roller 72 is rotated by the adjusting member 71, which drives the restraint band 61 to move and apply prestress, so that the restraint band 61 presses tightly against the surface of the cargo 1. At the same time, the ratchet 73 cooperates with the locking block 74 to prevent the rolling roller 72 from rotating in the opposite direction, maintain the stability of the prestress, and complete the fixing of the cargo 1.

[0065] Operating Principle: The core principle of this fastener is to achieve adaptive fixation and prestress retention of cargo 1 through structural linkage. Support component 3 serves as the basic frame, and its detachable design adapts to different vehicle frames 2. The bidirectional screw 42 of the adjusting component 4 is threadedly connected to the slider 5, utilizing the self-locking property of the threaded transmission to precisely adjust the spacing of the slider 5, adapting to changes in the size of cargo 1. The double-locking structure of the slider 5's locking block 51 and sliding groove 33, and the locking groove 52 and locking plate ensures stable movement and prevents slippage of the slider 5. The flexible constraint band 61 of the constraint mechanism 6 is connected to the positioning groove 721 of the rolling roller 72 via the buckle 62. When the rolling roller 72 rotates, the constraint band 61 is tightened and generates prestress, directly acting on the surface of cargo 1. The ratchet 73 (one-way ratchet) and locking block 74 cooperate to form a one-way locking mechanism—the locking block 74 is reset by a torsion spring, always locked between the teeth of the ratchet 73, preventing it from rotating in the opposite direction, thus avoiding prestress relaxation. Finally, the continuous pre-tightening force of the constraint band 61 achieves reliable fixation of cargo 1.

[0066] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model.

Claims

1. A large cargo securing device, characterized in that, include: The support member (3) is detachably mounted on the frame (2), and an adjustment component (4) is provided on the support member (3); The slider (5) is movably set in the groove (33) on the support (3) and matches the adjustment component (4). A pre-tightening mechanism (7) is also provided on the slider (5). The restraint mechanism (6) is detachably mounted between two sliders (5) on the same support (3), presses tightly against the surface of the cargo (1), and matches the pre-tensioning mechanism (7).

2. A large cargo fastener as described in claim 1, characterized in that, The support member (3) includes an integrally formed component: Main steel components (31); Two wing plates (32) are symmetrically arranged on both sides of the main steel part (31), and mounting holes are provided on the wing plates (32) to match the positioning bolts (8).

3. A large cargo fastener as described in claim 2, characterized in that, The slide (33) is a trapezoidal slide provided on the main steel part (31), and a locking port (34) is also provided on the main steel part (31) to communicate with the slide (33).

4. A large cargo fastener as described in claim 1, characterized in that, The adjustment component (4) includes: A bidirectional screw (42) is rotatably mounted on the support (3) and passes through a trapezoidal groove (33). Its two ends are threadedly connected to two sliders (5). The adjusting block (41) is fixedly installed at one end of the bidirectional screw (42) and located outside the support (3).

5. A large cargo fastener as described in claim 1, characterized in that, The bottom of the slider (5) is provided with a locking block (51), which engages in the trapezoidal groove (33) on the main steel part (31); a slot (52) is formed on the upper side of the locking block (51), which corresponds to the locking plate provided on the upper side of the groove (33).

6. A large cargo fastener as described in claim 1, characterized in that, The restraint mechanism (6) includes a high-strength flexible restraint band (61), and the restraint band (61) is provided with buckles (62) at both ends. The buckles (62) are J-shaped structures, and a bent buckle structure is provided at the lower end of the buckles (62).

7. A large cargo fastener as described in claim 6, characterized in that, The preload mechanism (7) includes: The adjusting component (71) is rotatably disposed in the U-shaped slot at the upper end of the slider (5) and extends through the slot; The rolling roller (72) is rotatably mounted in the U-shaped slot via the adjusting member (71); The ratchet (73) is coaxially arranged with the rolling roller (72) and fixedly connected to one end of the rolling roller (72).

8. A large cargo fastener as described in claim 7, characterized in that, The rolling roller (72) has a positioning groove (721) along its length direction, and the positioning groove (721) matches the lower end snap-fit ​​structure of the snap-fit ​​component (62).

9. A large cargo fastener as described in claim 7, characterized in that, The ratchet (73) is a one-way ratchet that matches the locking block (74). The locking block (74) is rotatably disposed on the inner side of one side plate of the U-shaped slot at the upper end of the slider (5).

10. A large cargo fastener as described in claim 9, characterized in that, The locking block (74) is rotatably mounted on the inner side of one side plate of the U-shaped slot at the upper end of the slider (5) via a connecting shaft, and a torsion spring (75) is provided on the inner side of the locking block (74), with the other end of the torsion spring (75) fixedly connected to the same side plate of the U-shaped slot.

Images