A folding electric bicycle handlebar fixing assembly

Abstract

The utility model relates to electric bicycle technical field discloses a kind of folding electric bicycle handlebar fixing assembly convenient to fold, including electric bicycle front fork axle, handlebar fixed rod, handle, fixed assembly and auxiliary assembly, handlebar fixed rod one end fixed folding hinge cylinder, two folding hinge cylinders are hinged on one side, inside plug-in front fork axle, top end is fixed by bolt, the fixed ring front end of handlebar one end has fixed shaft, handlebar fixed rod other end has connecting ring, fixed shaft is inserted in fixed groove, positioning cylinder is inserted in positioning groove, fixed ring and connecting ring are close, guide plate is slidably installed in mounting frame, fixed end head is into fixed groove through telescopic hole, insert fixed hole of fixed shaft, auxiliary assembly contains auxiliary clamping block and auxiliary spring, auxiliary clamping block is attached to guide plate bottom under the action of auxiliary spring and prevents mistaken touch, when disassembling, move auxiliary clamping block to auxiliary clamping groove, press mounting rod to make fixed end head exit, when folding, loosen bolt, folding is realized by using two folding hinge cylinders hinge folding storage.

Description

Technical Field

[0001] This utility model relates to the field of electric bicycle technology, specifically to a foldable electric bicycle handlebar fixing component. Background Technology

[0002] The handlebar mounting system is a key component of electric bicycles. It is mainly used to stably connect the handlebars to the front fork axle, ensuring that the rider can accurately control the direction of the vehicle when operating the handlebars, providing a basic guarantee for riding safety. With the acceleration of urbanization, people's requirements for the portability and space utilization of transportation tools are increasing. Electric bicycles are widely favored due to their flexibility and environmental protection features. As an important control component of electric bicycles, the performance of the handlebar mounting system directly affects the user experience and storage convenience of electric bicycles. Therefore, a handlebar mounting system that can balance a stable connection with convenient folding is needed.

[0003] Traditional electric bicycle handlebar fixing components often suffer from a lack of structural design. They either prioritize connection stability at the expense of folding functionality, resulting in electric bicycles taking up a lot of space when stored or carried, making them unsuitable for cramped living environments or public transportation needs; or their folding structure design is unreasonable, leading to decreased stability in the connection between the handlebars and the fork axle, causing the handlebars to wobble or even loosen during riding. This not only affects riding comfort but may also pose a safety hazard. To address this, we have proposed an easy-to-fold electric bicycle handlebar fixing component. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an easy-to-fold electric bicycle handlebar fixing component, solving the aforementioned problems.

[0005] To achieve the above-mentioned objectives, this utility model provides the following technical solution: a foldable electric bicycle handlebar fixing assembly, comprising:

[0006] The electric bicycle includes a front fork axle, a handlebar fixing rod, and a handlebar. One end of the handlebar fixing rod is fixed with a folding hinge tube, and two folding hinge tubes are hinged together on one side. The electric bicycle front fork axle is inserted into the inside of the folding hinge tube, and the electric bicycle front fork axle is fixed to the top of the folding hinge tube by bolts. The handlebar is inserted into the inner side of the other end of the handlebar fixing rod.

[0007] A fixing component is provided inside the other end of the handlebar fixing rod. The fixing component consists of a mounting rod, a mounting spring, a guide plate, and a fixing end, and is used to fix the connection between the handlebar fixing rod and the handlebar.

[0008] An auxiliary component is disposed inside the other end of the handlebar fixing rod. The auxiliary component is located below the fixing component and is used to assist the fixing component and cooperate with the connection between the handlebar fixing rod and the handlebar.

[0009] Preferably, the top end of the electric bicycle front fork axle is polygonal, the folding hinge cylinder is semi-cylindrical, and the two folding hinge cylinders form a complete cylinder. The bottom end between the two folding hinge cylinders is polygonal. The top end of the electric bicycle front fork axle is inserted into the interior of the two folding hinge cylinders and fixedly connected by bolts.

[0010] Preferably, the other end face of the handlebar fixing rod is provided with a connecting ring, the front end of the connecting ring is provided with a positioning cylinder, the inside of the connecting ring is provided with a fixing groove, the fixing groove is located inside the positioning cylinder, one end of the handlebar is provided with a fixing ring, the front end of the fixing ring is fixed with a fixing shaft, and the inside of the fixing ring is provided with a positioning groove, the positioning groove is located outside the fixing shaft.

[0011] Preferably, the fixing shaft on the end face of the fixing ring is inserted into the inside of the fixing groove, and the positioning cylinder is inserted into the inside of the positioning groove, wherein the fixing ring and the connecting ring are tightly fitted together, and the outer cylindrical surface of the fixing shaft is provided with symmetrically distributed fixing holes.

[0012] Preferably, the other end of the handle fixing rod is fixed with a mounting frame, which is located at the front end of the connecting ring. The top of the mounting frame has symmetrically distributed telescopic holes, which are connected to the fixing groove. The other end of the handle fixing rod has a mounting rod telescopic cavity, which is located on one side of the mounting frame.

[0013] Preferably, a mounting rod is fixed to the top right side of the guide plate, and a mounting spring is sleeved on the mounting rod. The top of the guide plate is fixed with symmetrically distributed fixed ends, and an auxiliary slot is provided on the guide plate, which is located between the two fixed ends.

[0014] Preferably, the guide plate is slidably installed inside the mounting frame, and the fixed end of the top of the guide plate extends into the interior of the fixing groove through the telescopic hole, and the fixed end is inserted into the fixing hole on the outer cylindrical surface of the fixing shaft. The mounting rod and the mounting spring are arranged inside the telescopic cavity of the mounting rod, and the end of the mounting spring is fixedly connected to the right side of the guide plate.

[0015] Preferably, the auxiliary component consists of an auxiliary locking block and an auxiliary spring. The auxiliary locking block is L-shaped, with an auxiliary rod at its front end and an auxiliary spring sleeved on the auxiliary rod. The auxiliary locking block is located at the bottom of the guide plate and below the auxiliary locking slot, and the auxiliary rod extends through the mounting frame in a telescopic cooperation manner.

[0016] Compared with the prior art, this utility model provides an easy-to-fold electric bicycle handlebar fixing component, which has the following advantages:

[0017] This foldable electric bicycle handlebar fixing assembly uses two semi-cylindrical folding hinged cylinders that fit into the polygonal-topped electric bicycle front fork axle. With bolt fixing and a hinged structure, loosening the bolts allows the handlebars to be folded for storage, significantly reducing storage space and improving portability and ease of storage. Simultaneously, a spring-driven guide plate in the fixing assembly inserts the fixing end into the fixing hole of the fixing shaft. An auxiliary locking block in the auxiliary assembly, under the action of an auxiliary spring, adheres to the bottom of the guide plate, providing double protection to effectively prevent the handlebars from accidentally detaching, enhancing connection stability and safety. Disassembly is simple: move the auxiliary locking block to the auxiliary locking slot and press the mounting rod to remove the fixing end. This quick and easy operation facilitates handlebar disassembly, maintenance, or replacement. The fixing ring and connecting ring fit tightly together, and the positioning cylinder and positioning groove, as well as the fixing shaft and fixing groove, precisely insert to ensure accurate connection between the handlebars and the handlebar fixing rod, preventing wobbling that could affect the riding experience. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the folding structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the disassembled structure of this utility model;

[0021] Figure 4 for Figure 3 A magnified view of part A in the diagram;

[0022] Figure 5 This is a cross-sectional view of the handle fixing rod structure of this utility model.

[0023] In the diagram: 1. Electric bicycle front fork axle; 2. Folding hinge cylinder; 3. Handlebar fixing rod; 4. Handlebar; 5. Fixing ring; 6. Fixing shaft; 7. Positioning groove; 8. Mounting rod; 9. Mounting spring; 10. Guide plate; 11. Auxiliary slot; 12. Fixing end; 13. Auxiliary block; 14. Auxiliary spring; 15. Connecting ring; 16. Positioning cylinder; 17. Fixing groove; 18. Mounting frame; 19. Mounting rod telescopic cavity. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-5 A foldable electric bicycle handlebar fixing assembly includes:

[0026] The electric bicycle has a front fork shaft 1, a handlebar fixing rod 3, and a handlebar 4. One end of the handlebar fixing rod 3 is fixed with a folding hinge tube 2, and two folding hinge tubes 2 are hinged together on one side. The electric bicycle front fork shaft 1 is inserted into the inside of the folding hinge tube 2. The electric bicycle front fork shaft 1 and the top of the folding hinge tube 2 are fixed by bolts. The handlebar 4 is inserted into the inner side of the other end of the handlebar fixing rod 3.

[0027] A fixing component is provided inside the other end of the handlebar fixing rod 3. The fixing component consists of a mounting rod 8, a mounting spring 9, a guide plate 10, and a fixing end 12, and is used to fix the connection between the handlebar fixing rod 3 and the handlebar 4.

[0028] An auxiliary component is located inside the other end of the handlebar fixing rod 3. The auxiliary component is located below the fixing component and is used to assist the fixing component and cooperate with the connection between the handlebar fixing rod 3 and the handlebar 4.

[0029] Furthermore, the top of the electric bicycle front fork shaft 1 is polygonal, and the folding hinge cylinder 2 is semi-cylindrical. The two folding hinge cylinders 2 form a complete cylinder, and the bottom of the two folding hinge cylinders 2 is polygonal inside. The top of the electric bicycle front fork shaft 1 is inserted into the interior of the two folding hinge cylinders 2 and fixedly connected by bolts. This clarifies the connection form between the two, provides a structural basis for the folding function of the handlebars, and ensures the initial stability of the connection.

[0030] Furthermore, a connecting ring 15 is provided on the other end face of the handlebar fixing rod 3, and a positioning cylinder 16 is provided at the front end of the connecting ring 15. A fixing groove 17 is provided inside the connecting ring 15, and the fixing groove 17 is located inside the positioning cylinder 16. A fixing ring 5 is provided at one end of the handlebar 4, and a fixing shaft 6 is fixed at the front end of the fixing ring 5. A positioning groove 7 is provided inside the fixing ring 5, and the positioning groove 7 is located outside the fixing shaft 6. This provides a structural basis for the precise docking of the two and is a prerequisite for achieving a stable connection.

[0031] Furthermore, the fixing shaft 6 on the end face of the fixing ring 5 is inserted into the inside of the fixing groove 17, and the positioning cylinder 16 is inserted into the inside of the positioning groove 7. The fixing ring 5 and the connecting ring 15 fit tightly together. The outer cylindrical surface of the fixing shaft 6 has symmetrically distributed fixing holes, which clarifies the docking method between the handlebar 4 and the handlebar fixing rod 3, laying the foundation for the function of the fixing component. At the same time, the fixing holes on the fixing shaft 6 provide a position for the insertion of the fixing end 12.

[0032] Furthermore, a mounting frame 18 is fixed to the bottom of the other end of the handle fixing rod 3. The mounting frame 18 is located at the front end of the connecting ring 15. Symmetrically distributed telescopic holes are opened at the top of the interior of the mounting frame 18, and the telescopic holes are connected to the fixing groove 17. A mounting rod telescopic cavity 19 is opened at the other end of the handle fixing rod 3. The mounting rod telescopic cavity 19 is located on one side of the mounting frame 18, providing space and structural support for the installation of the guide plate 10, the mounting rod 8 and the mounting spring 9 in the fixing assembly. It is the basis for the installation and operation of the fixing assembly.

[0033] Furthermore, a mounting rod 8 is fixed to the top right side of the guide plate 10, and a mounting spring 9 is sleeved on the mounting rod 8. The top of the guide plate 10 is fixed with symmetrically distributed fixing ends 12. An auxiliary slot 11 is provided on the guide plate 10, which is located between the two fixing ends 12. This clarifies the composition and positional relationship of each component of the fixing assembly, providing structural detail support for the fixing assembly to achieve its fixing function.

[0034] Furthermore, the guide plate 10 is slidably installed inside the mounting frame 18, and the fixed end 12 at the top of the guide plate 10 extends into the interior of the fixing groove 17 through the telescopic hole. The fixed end 12 is inserted into the fixing hole on the outer cylindrical surface of the fixing shaft 6. The mounting rod 8 and the mounting spring 9 are set inside the telescopic cavity 19 of the mounting rod, and the end of the mounting spring 9 is fixedly connected to the right side of the guide plate 10, presenting the installation state and working basis of the fixing component, which is the direct structural embodiment of the fixing component playing a fixing role.

[0035] Furthermore, the auxiliary component consists of an auxiliary locking block 13 and an auxiliary spring 14. The auxiliary locking block 13 is L-shaped, with an auxiliary rod at its front end. The auxiliary spring 14 is sleeved on the auxiliary rod. The auxiliary locking block 13 is located at the bottom of the guide plate 10 and below the auxiliary locking groove 11. The auxiliary rod extends through the mounting frame 18 in a telescopic cooperation manner. This clarifies the composition, structure, and installation method of the auxiliary component, providing a structural description for the auxiliary component to assist the fixing component in its work.

[0036] Structural Description:

[0037] Electric bicycle front fork axle 1: The top is polygonal and is the basic component for connecting the handlebars to the frame. It is inserted into the folding hinge tube 2 and fixed with bolts to ensure connection stability.

[0038] Folding hinge cylinder 2: It is semi-cylindrical, and two fit together to form a complete cylinder. The bottom end is polygonal and is adapted to the front fork shaft 1. It is hinged on one side to realize the handlebar folding function.

[0039] Handlebar fixing rod 3: One end is fixed to the folding hinge tube 2, and the other end is inserted into the handlebar 4. It is the intermediate part connecting the front fork shaft 1 and the handlebar 4, and supports the fixing components, etc.

[0040] Handlebar 4: One end is equipped with a fixing ring 5, which is a riding control component. It is connected to the handlebar fixing rod 3 through the fixing ring 5, etc. It needs to be stable and easy to disassemble.

[0041] Fixed ring 5: Located at one end of handlebar 4, with a fixed shaft 6 at the front end and a positioning groove 7 inside, which fits tightly with the connecting ring 15 to assist the handlebar 4 in connecting with the handlebar fixing rod 3;

[0042] Fixed shaft 6: Fixed to the front end of fixed ring 5, with a fixing hole on the outer cylindrical surface, it is inserted into the fixing groove 17 to provide an insertion point for the fixed end 12 and to assist in fixing the handle 4;

[0043] Positioning groove 7: It is formed inside the fixing ring 5 and outside the fixing shaft 6, for the positioning cylinder 16 to be inserted, to assist the fixing ring 5 and the connecting ring 15 in precise docking, and to ensure the connection accuracy;

[0044] Mounting rod 8: Fixed to the top right side of guide plate 10, with mounting spring 9 sleeved on it, located inside the telescopic cavity 19 of mounting rod. Pressing it can move guide plate 10, thus detaching the fixed end 12.

[0045] Install spring 9: It is sleeved on the mounting rod 8 and its end is connected to the right side of the guide plate 10. It provides elastic force to reset the guide plate 10 and ensures that the fixed end 12 is stably inserted into the fixed hole.

[0046] Guide plate 10: It is slidably installed in the mounting frame 18, with a fixed end 12 at the top and a mounting rod 8 on the right side. It can slide and drive the fixed end 12 to move. It is the core component of the fixing assembly.

[0047] Auxiliary slot 11: It is formed on the guide plate 10 between the two fixed ends 12, and can cooperate with the auxiliary block 13 to release the restriction of the auxiliary block 13 on the guide plate 10;

[0048] Fixed end 12: Symmetrically fixed to the top of the guide plate 10, extending to the fixed groove 17 through the telescopic hole, and inserted into the fixed hole of the fixed shaft 6 to fix the handlebar 4 and the handlebar fixing rod 3;

[0049] Auxiliary block 13: L-shaped, located at the bottom of guide plate 10, with an auxiliary rod with auxiliary spring 14 at the front end, which can fit against the bottom of guide plate 10 to prevent accidental contact and assist the fixing component in working;

[0050] Auxiliary spring 14: Sleeved onto the auxiliary rod of auxiliary block 13, providing elastic force to make auxiliary block 13 fit against guide plate 10, ensuring the stability of its auxiliary fixation;

[0051] Connecting ring 15: On the other end face of the handlebar fixing rod 3, there is a positioning cylinder 16 at the front end, with a fixing groove 17 inside, which is in close contact with the fixing ring 5. It is a key structure for connecting the handlebar 4.

[0052] Positioning cylinder 16: Located at the front end of connecting ring 15, it can be inserted into positioning groove 7 to assist connecting ring 15 in precise docking with fixed ring 5 and improve connection accuracy;

[0053] Fixed groove 17: Located inside the connecting ring 15 and inside the positioning cylinder 16, it is used for the fixed shaft 6 to be inserted, providing a basis for the connection between the handlebar 4 and the handlebar fixing rod 3;

[0054] Mounting frame 18: Fixed to the bottom of the other end of the handle fixing rod 3, with a telescopic hole at the top inside for sliding installation of the guide plate 10, and serves as the mounting carrier for the fixing components;

[0055] Mounting rod telescopic cavity 19: It is opened at the other end of the handle fixing rod 3 and on one side of the mounting frame 18, to accommodate the mounting rod 8 and the mounting spring 9 and provide them with telescopic space.

[0056] Working principle: In the fixed state, the fixing shaft 6 at the front end of the fixing ring 5 at one end of the handlebar 4 is precisely inserted into the fixing groove 17 inside the connecting ring 15 at the other end of the handlebar fixing rod 3. At the same time, the positioning cylinder 16 is inserted into the positioning groove 7, so that the fixing ring 5 and the connecting ring 15 fit tightly together, laying the foundation for subsequent fixing. At this time, the guide plate 10 is in a specific position inside the mounting frame 18 under the elastic force of the mounting spring 9. The symmetrically distributed fixing ends 12 at its top end extend into the fixing groove 17 through the telescopic hole, and the fixing ends 12 are inserted into the fixing hole on the outer cylindrical surface of the fixing shaft 6. This achieves initial fixation. Simultaneously, under the action of the auxiliary spring 14, the top surface of the auxiliary locking block 13 in the auxiliary assembly is tightly fitted with the bottom surface of the guide plate 10, effectively preventing accidental downward pressing of the mounting rod 8 and causing the fixing end 12 to detach from the fixing hole, thus preventing the handlebar 4 from falling off and ensuring the stability of the handlebar connection. When disassembly is required, external force must first be applied to the auxiliary locking block 13 to overcome the elastic force of the auxiliary spring 14. The auxiliary rod then moves the auxiliary locking block 13 outward, and the top of the auxiliary locking block 13 is moved via the telescopic rod. When the auxiliary slot 11 on the guide plate 10 is engaged, the auxiliary locking block 13 no longer restricts the guide plate 10. Then, the mounting rod 8 is pressed down, which causes the guide plate 10 to slide downward within the mounting frame 18. At the same time, the mounting spring 9 is compressed, and the movement of the guide plate 10 causes the top fixed end 12 to exit from the fixing hole of the fixing shaft 6, releasing the fixing effect of the fixed end 12 on the fixing shaft 6. When the fixed end 12 is completely disengaged from the fixing hole, the connection between the fixing shaft 6 and the fixed end 12 is completely separated. At this point, the handlebar 4 can be removed from the handlebar fixing rod. 3. Remove from the top to complete the disassembly process. In the fixed state, the top of the electric bicycle front fork shaft 1 is polygonal, which fits perfectly into the complete cylinder formed by two semi-cylindrical folding hinge tubes 2. The bottom of the two folding hinge tubes 2 is also polygonal, which matches the shape of the top of the electric bicycle front fork shaft 1. Then, fix the top of the two with bolts to make the handlebar fixing rod 3 firmly connected to the electric bicycle front fork shaft 1. If you need to fold the handlebar, loosen the bolts connecting the folding hinge tubes 2 and the front fork shaft 1, and use the hinge cooperation of the two folding hinge tubes 2 to fold and store it.

[0057] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A foldable electric bicycle handlebar fixing assembly, characterized in that, include: The electric bicycle has a front fork shaft (1), a handlebar fixing rod (3) and a handlebar (4). One end of the handlebar fixing rod (3) is fixed with a folding hinge tube (2), and two folding hinge tubes (2) are hinged together on one side. The electric bicycle front fork shaft (1) is inserted into the inside of the folding hinge tube (2). The electric bicycle front fork shaft (1) and the top end of the folding hinge tube (2) are fixed by bolts. The handlebar (4) is inserted into the inner side of the other end of the handlebar fixing rod (3). A fixing component is provided inside the other end of the handlebar fixing rod (3). The fixing component consists of a mounting rod (8), a mounting spring (9), a guide plate (10), and a fixing end (12) for fixing the connection between the handlebar fixing rod (3) and the handlebar (4). An auxiliary component is provided inside the other end of the handlebar fixing rod (3). The auxiliary component is located below the fixing component and is used to assist the fixing component and cooperate with the connection between the handlebar fixing rod (3) and the handlebar (4).

2. The foldable electric bicycle handlebar fixing assembly according to claim 1, characterized in that, The top of the electric bicycle front fork shaft (1) is polygonal, and the folding hinge tube (2) is semi-cylindrical. The two folding hinge tubes (2) form a complete cylinder, and the bottom of the two folding hinge tubes (2) is polygonal. The top of the electric bicycle front fork shaft (1) is inserted into the interior of the two folding hinge tubes (2) and fixedly connected by bolts.

3. The foldable electric bicycle handlebar fixing assembly according to claim 1, characterized in that, The other end face of the handlebar fixing rod (3) is provided with a connecting ring (15), the front end of the connecting ring (15) is provided with a positioning cylinder (16), the inside of the connecting ring (15) is provided with a fixing groove (17), the fixing groove (17) is located inside the positioning cylinder (16), one end of the handlebar (4) is provided with a fixing ring (5), the front end of the fixing ring (5) is fixed with a fixing shaft (6), and the inside of the fixing ring (5) is provided with a positioning groove (7), the positioning groove (7) is located outside the fixing shaft (6).

4. The foldable electric bicycle handlebar fixing assembly according to claim 3, characterized in that, The fixing shaft (6) on the end face of the fixing ring (5) is inserted into the inside of the fixing groove (17), and the positioning cylinder (16) is inserted into the inside of the positioning groove (7). The fixing ring (5) and the connecting ring (15) are tightly fitted together, and the outer cylindrical surface of the fixing shaft (6) is provided with symmetrically distributed fixing holes.

5. The foldable electric bicycle handlebar fixing assembly according to claim 4, characterized in that, The other end of the handle fixing rod (3) is fixed with a mounting frame (18). The mounting frame (18) is located at the front end of the connecting ring (15). The top of the mounting frame (18) is provided with symmetrically distributed telescopic holes, and the telescopic holes are connected to the fixing groove (17). The other end of the handle fixing rod (3) is provided with a mounting rod telescopic cavity (19), which is located on one side of the mounting frame (18).

6. The foldable electric bicycle handlebar fixing assembly according to claim 1, characterized in that, A mounting rod (8) is fixed on the top right side of the guide plate (10), and a mounting spring (9) is sleeved on the mounting rod (8). The top of the guide plate (10) is fixed with symmetrically distributed fixed ends (12). An auxiliary slot (11) is provided on the guide plate (10), and the auxiliary slot (11) is located between the two fixed ends (12).

7. A foldable electric bicycle handlebar fixing assembly according to claim 6, characterized in that, The guide plate (10) is slidably installed inside the mounting frame (18), and the fixed end (12) at the top of the guide plate (10) extends into the interior of the fixed groove (17) through the telescopic hole, and the fixed end (12) is inserted into the fixed hole on the outer cylindrical surface of the fixed shaft (6). The mounting rod (8) and the mounting spring (9) are set inside the telescopic cavity (19) of the mounting rod, and the end of the mounting spring (9) is fixedly connected to the right side of the guide plate (10).

8. The foldable electric bicycle handlebar fixing assembly according to claim 1, characterized in that, The auxiliary component consists of an auxiliary locking block (13) and an auxiliary spring (14). The auxiliary locking block (13) is L-shaped, with an auxiliary rod at the front end of the auxiliary locking block (13) and an auxiliary spring (14) sleeved on the auxiliary rod. The auxiliary locking block (13) is located at the bottom of the guide plate (10) and below the auxiliary locking slot (11), with the auxiliary rod extending through the mounting frame (18) for telescopic cooperation.

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