A detachable landing gear of a multi-rotor unmanned aerial vehicle for teaching

Abstract

The utility model relates to unmanned plane technical field discloses a detachable landing gear of multirotor unmanned plane for teaching, including support frame, the outer side fixed connection of support frame has the folding anti -topple mechanism, support frame inner side fixed connection has quick -release mechanism, the bottom fixed connection of quick -release mechanism has the base, the bottom fixed connection of folding anti -topple mechanism has the support leg, folding anti -topple mechanism includes mounting bracket, the one side fixed connection of mounting bracket is in the outer side of support frame, the outer side fixed connection of mounting bracket has the fixed block, the top fixed connection of fixed block has the limit component, the inside rotatory connection of fixed block has the rotary axle, the outer side fixed connection of rotary axle has the rotary ring. In the utility model, folding anti -topple mechanism expands the support range and enhances the anti -topple ability, and also reduces the volume after folding and is convenient for teaching transportation storage, also avoids the component loose displacement and folding jam.

Description

Technical Field

[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) technology, and in particular to a detachable landing gear for a multi-rotor UAV used for teaching. Background Technology

[0002] The detachable landing gear of the multi-rotor drone used for teaching is a detachable support structure adapted to teaching scenarios, combining teaching and protection functions. It allows students to understand the structural logic of the drone through assembly, practice maintenance and debugging, and can also be changed to different types to adapt to experiments such as load testing. At the same time, it can raise the fuselage to protect core components, buffer impacts to ensure operational safety, and save storage and transportation space after disassembly. It is a key component that combines teaching practice, equipment protection and flexible use, which is different from consumer-grade fixed landing gear drones. The detachable landing gear for teaching multi-rotor drones is designed for easy assembly and disassembly and is adapted to teaching purposes. It consists of four main modules: First, a triangular or quadrangular support body made of lightweight materials, which is responsible for raising the fuselage and bearing the weight for take-off and landing; second, connecting parts including buckles and quick-release screws, which facilitate quick assembly and disassembly and observation of the connection principle; third, a buffer component including silicone pads and small springs, which can reduce impact, protect the equipment, and demonstrate buffer mechanics; and fourth, an auxiliary structure including limit buckles and marking scales, which helps with accurate installation and emphasizes the importance of installation calibration. Existing teaching multirotor drones with detachable landing gear often have a single, fixed support structure without specific anti-tipping design. When taking off and landing on uneven outdoor terrain, uneven ground can cause uneven stress on the landing gear. The rigid support cannot adaptively adjust its angle, leading to the drone tilting. The separate bottom buffer component cannot disperse the impact force in the tilting direction, easily causing tipping, damaging the fuselage components, interrupting teaching, and increasing costs. The folding mechanism's rotating parts are only single-axis positioned without reinforcement, making them prone to displacement with repeated operation. Furthermore, there is no clear locking feedback, making it difficult for trainees to judge the status. When taking off and landing without locking, the mechanism can easily retract unexpectedly, causing the drone to become unbalanced and tip over. Therefore, a detachable landing gear for teaching multirotor drones is proposed to solve the above problems. Utility Model Content

[0003] To overcome the above shortcomings, this utility model provides a detachable landing gear for a multi-rotor drone used for teaching, aiming to improve the problem that existing detachable landing gear is prone to tilting and tipping over when taking off and landing on uneven outdoor ground due to a single fixed support structure and the lack of targeted anti-tipping design.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a detachable landing gear for a teaching multi-rotor drone, including a support frame, a folding anti-tipping mechanism fixedly connected to the outer side of the support frame, a quick-release mechanism fixedly connected to the inner side of the support frame, a base fixedly connected to the bottom of the quick-release mechanism, and a support foot fixedly connected to the bottom of the folding anti-tipping mechanism. The folding anti-tipping mechanism includes a mounting frame, one side of which is fixedly connected to the outside of the support frame. A fixing block is fixedly connected to the outside of the mounting frame. A limit component is fixedly connected to the top of the fixing block. A rotating shaft is rotatably connected inside the fixing block. A rotating ring is fixedly connected to the outside of the rotating shaft. A positioning plate is fixedly connected to the top of the fixing block. A rotating shaft is rotatably connected to the inside of the positioning plate. A support arm is rotatably connected to the outside of the mounting frame. As a further description of the above technical solution: The quick-release mechanism includes a housing, the outer side of which is fixedly connected to the inner side of the support frame, a second spring is slidably connected to the inner side of the housing, a piston is fixedly connected to the top of the second spring, a connector is slidably connected to the top of the piston, a locking block is fixedly connected to the outer side of the connector, and a limit ring is rotatably connected to the outer side of the housing. As a further description of the above technical solution: The limiting component includes a spring, the bottom of which is fixedly connected to the top of the fixing block, a pressing plate is fixedly connected to the top of the spring, and a limiting plate is fixedly connected to one side of the pressing plate. As a further description of the above technical solution: The outer side of the piston is fixedly connected to the inner side of the housing, and the outer side of the connector is fixedly connected to the inner side of the housing. As a further description of the above technical solution: The outer side of the limiting ring is rotatably connected to the top of the housing, and the outer side of the connector is slidably connected to the inner side of the limiting ring. As a further description of the above technical solution: The outer side of the rotating ring is rotatably connected to the inner side of the support arm, and the outer side of the rotating ring is fixedly connected to one side of the fixed block. As a further description of the above technical solution: A support arm is rotatably connected to the outer side of the rotating shaft, and the outer side of the fixing block is fixedly connected to the top of the support arm. As a further description of the above technical solution: The outer side of the rotating shaft is fixedly connected to the inner side of the limiting plate, and the outer side of the limiting plate is slidably connected to the inner side of the rotating ring.

[0005] This utility model has the following beneficial effects: 1. In this utility model, the folding anti-tipping structure drives the fixed block to fix the rotating shaft structure to work. The rotating shaft supports the rotating ring to rotate, and the rotating ring is linked to the support arm to unfold or retract. At the same time, the limiting component limits and fixes at a designated position, and the positioning plate ensures the coaxiality of the rotating shaft, realizing the folding and unfolding support function of the landing gear. Compared with the prior art, it expands the support range and enhances the anti-tipping ability, reduces the volume after folding for convenient teaching, transportation and storage, and avoids loosening and displacement of parts and folding jamming.

[0006] 2. In this utility model, the quick-release structure drives the spring reset structure to work. After the spring is compressed and stores its elastic force, it pushes the piston to reset. The piston slides and drives the connector to adjust its position, so that the locking block is locked or disengaged from the slot. After the connection is completed, the limiting ring is rotated to limit the component, realizing the quick disassembly and assembly function of the landing gear and the fuselage. Compared with the prior art, it improves the disassembly and assembly efficiency. In addition, the tight fit of the locking block and the reinforcement of the limiting ring prevent the connection from loosening. At the same time, the wear-resistant shell and the elastic reset structure ensure the long-term stable operation of the quick-release mechanism. Attached Figure Description

[0007] Figure 1 This is a three-dimensional schematic diagram of a detachable landing gear for a teaching multi-rotor UAV proposed in this utility model; Figure 2 This is a schematic diagram of the support frame structure for the detachable landing gear of a multi-rotor UAV for teaching purposes, as proposed in this utility model. Figure 3 for Figure 2 Enlarged view of point A in the middle; Figure 4 This is a schematic diagram of the limiting ring structure of the detachable landing gear of a multi-rotor UAV for teaching purposes proposed in this utility model.

[0008] Legend: 1. Support frame; 2. Folding anti-tipping mechanism; 21. Mounting bracket; 22. Fixing block; 23. Limiting assembly; 231. Spring 1; 232. Pressing plate; 233. Limiting plate; 24. Rotating shaft; 25. Rotating ring; 26. Positioning plate; 27. Rotating shaft; 28. Support arm; 3. Quick-release mechanism; 31. Outer shell; 32. Spring 2; 33. Piston; 34. Connector; 35. Locking block; 36. Limiting ring; 4. Base; 5. Support legs. Detailed Implementation

[0009] 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.

[0010] Example: A detachable landing gear for a teaching multi-rotor drone, referenced Figures 1 to 3 The system includes a support frame 1, which is made of high-strength lightweight alloy material and provides stable support for the entire landing gear. It effectively supports the weight of the drone and prevents the drone from tilting due to unstable support during teaching operations. A folding anti-tipping mechanism 2 is fixedly connected to the outside of the support frame 1. The folding anti-tipping mechanism 2 can be unfolded when the drone takes off and lands, increasing the contact area between the landing gear and the ground, significantly improving the stability of the drone when parked, and preventing the drone from accidentally tipping over during teaching. A quick-release mechanism 3 is fixedly connected to the inside of the support frame 1. The quick-release mechanism 3 adopts a convenient buckle design, which allows users to quickly disassemble and install the landing gear in teaching scenarios, saving equipment assembly time. A base 4 is fixedly connected to the bottom of the quick-release mechanism 3. The bottom of the base 4 is provided with anti-slip texture, which can enhance the friction with the ground and prevent the drone from slipping when parked or taking off and landing, ensuring the safety of teaching operations. Specifically, when using drones for teaching, the support frame 1 is made of high-strength material to support the weight of the drone body; during take-off and landing, its outer folding anti-tipping mechanism 2 unfolds to increase the ground contact area and prevent tilting; when disassembly or assembly is required, the inner quick-release mechanism 3 can be quickly completed through buckles; the base 4 uses the anti-slip texture on the bottom to enhance the friction with the ground, and together with the support frame 1 and the anti-tipping mechanism, it can prevent the drone from slipping when parked or taking off and landing, thus ensuring teaching safety.

[0011] The bottom of the folding anti-tipping mechanism 2 is fixedly connected to a support foot 5. The support foot 5 is made of elastic material, which can buffer the impact force when the drone lands, reduce vibration damage to the fuselage and internal components, and extend the service life of the teaching drone. The folding anti-tipping mechanism 2 includes a mounting frame 21. One side of the mounting frame 21 is fixedly connected to the outside of the support frame 1. The mounting frame 21 provides a stable mounting base for each component of the folding anti-tipping mechanism 2, ensuring that each component works together without loosening or shifting. A fixing block 22 is fixedly connected to the outside of the mounting frame 21. The fixing block 22 can fix the installation position of the rotating shaft 24, ensuring that the rotating shaft 24 does not shift during rotation, and ensuring that the folding function of the folding anti-tipping mechanism 2 is realized smoothly. A limit component 23 is fixedly connected to the top of the fixing block 22. The limit component 23 can limit and fix the folding anti-tipping mechanism 2 when it is unfolded or folded to a designated position, preventing the components from rotating at will and ensuring the structural stability of the landing gear during use. Specifically, the mounting bracket 21 is fixed to the outside of the support frame 1, providing a foundation for each component of the folding anti-tipping mechanism 2; the fixing block 22 fixes the position of the rotating shaft 24 to ensure that it does not deviate during rotation, so as to achieve smooth folding or unfolding. When unfolded or folded to the designated position, the limiting component 23 limits and fixes the component to prevent it from rotating at will; the bottom support foot 5 of the mechanism is made of elastic material to buffer the impact force when landing and reduce the damage to the fuselage.

[0012] A rotating shaft 24 is rotatably connected inside the fixed block 22. The rotating shaft 24 supports the rotation of the rotating ring 25, allowing the rotating ring 25 to rotate flexibly, thereby driving the folding anti-tipping mechanism 2 to complete the folding and unfolding actions. The rotating ring 25 is fixedly connected to the outside of the rotating shaft 24. The rotating ring 25 can be linked with the support arm 28. By rotating itself, it drives the support arm 28 to unfold or retract, realizing the folding function of the folding anti-tipping mechanism 2. A positioning plate 26 is fixedly connected to the top of the fixed block 22. The positioning plate 26 can accurately position the installation position of the rotating shaft 27, ensuring... To ensure the coaxiality of the rotating shaft 27 during rotation and the stability of the support arm 28 during rotation, the inner side of the positioning plate 26 is rotatably connected to the rotating shaft 27. The rotating shaft 27 provides the axis for the rotation of the support arm 28, allowing the support arm 28 to rotate flexibly around the rotating shaft 27, facilitating the unfolding and storage of the folding anti-tipping mechanism 2. The outer side of the mounting bracket 21 is rotatably connected to the support arm 28. When unfolded, the support arm 28 can further expand the support range of the landing gear and enhance the anti-tipping ability of the drone when parked. When folded, it can reduce the volume of the landing gear, facilitating teaching, transportation, and storage. Specifically, the rotating shaft 24 inside the fixed block 22 supports the rotation of the rotating ring 25, which drives the support arm 28 to rotate in conjunction; the positioning plate 26 positions the rotating shaft 27, ensuring that the support arm 28 rotates stably around it; the support arm 28 unfolds to expand the support range and prevents tipping, and folds to reduce the volume for easy transportation; the rotating shaft 24 and the rotating shaft 27 work together to achieve flexible expansion and contraction of the mechanism.

[0013] Reference Figure 1 , Figure 2 and Figure 4The quick-release mechanism 3 includes a housing 31 made of wear-resistant engineering plastic, which protects internal components such as spring 32 and piston 33, ensuring long-term stable operation of the quick-release mechanism 3. The outer side of the housing 31 is fixedly connected to the inner side of the support frame 1. This fixing method allows the housing 31 and the support frame 1 to form a stable whole, preventing the quick-release mechanism 3 from shaking during drone take-off, landing, or movement, and ensuring connection reliability. Spring 32 is slidably connected to the inner side of the housing 31. Spring 32 has good elastic return capability and can store elastic force when piston 33 is compressed. Subsequently, the elastic force can push piston 33 to return to its original position. Piston 33 is fixedly connected to the top of spring 32. Piston 33 can slide smoothly inside the housing 31, transmitting the elastic force of spring 32 to the connecting parts. The connector 34 can also adjust its position by moving itself, thereby locking and disengaging the locking block 35. The top of the piston 33 is slidably connected to the connector 34. The sliding fit between the connector 34 and the piston 33 can accommodate fine-tuning of the position during component installation, ensuring that the locking block 35 can accurately engage with the corresponding slot for quick installation. The outer side of the connector 34 is fixedly connected to the locking block 35. The locking block 35 is made of a material with good toughness and can fit tightly after engaging with the slot, preventing the connector 34 from loosening. The outer side of the outer shell 31 is rotatably connected to the limiting ring 36. The limiting ring 36 can be rotated to adjust its position. After the quick-release mechanism 3 is installed, rotating the limiting ring 36 can limit the piston 33 or the connector 34, preventing accidental movement of the components from causing the locking block 35 to disengage and improving connection stability. Specifically, the outer shell 31 is fixed inside the support frame 1 to protect the internal components. When the piston 33 is pressed, the second spring 32 is compressed and stores force. The piston 33 drives the connector 34 to move, causing the locking block 35 to disengage from the slot and complete the disassembly. After being released, the second spring 32 returns to its original position, pushing the piston 33 and the connector 34 to return to their original positions, and the locking block 35 is locked. After installation, rotating the limiting ring 36 limits the piston 33 or the connector 34 to prevent the locking block 35 from accidentally disengaging.

[0014] Reference Figure 1 , Figure 3 and Figure 4The limiting component 23 includes a spring 231, which has good elastic return capability and can store elastic force when the pressing plate 232 is pressed. The spring force can then push the pressing plate 232 back to its original position, ensuring stable operation of the limiting function. The bottom of the spring 231 is fixedly connected to the top of the fixing block 22. This fixing method creates a stable connection between the spring 231 and the fixing block 22, preventing the spring 231 from shifting under force and ensuring accurate transmission of elastic force. The top of the spring 231 is fixedly connected to the pressing plate 232, which can withstand external pressing force. The action transmits force to the spring 231, which in turn drives the limiting plate 233 to move synchronously, realizing the switching between limiting and unlocking. The limiting plate 233 is fixedly connected to one side of the pressing plate 232. The limiting plate 233 can move with the pressing plate 232 and can engage or disengage from the rotating ring 25, thereby limiting or unlocking the rotating ring 25 and ensuring the stability of the mechanism position. The outer side of the piston 33 is fixedly connected to the inner side of the outer shell 31. This fixing method ensures that the piston 33 does not deviate when sliding inside the outer shell 31, ensuring that the elastic force of the spring 22 can be stably transmitted and the precise action of the locking block 35 can be realized. Specifically, pressing the pressing plate 232 of the limiting component 23 transmits force to the first spring 231, causing it to be compressed and store force. The pressing plate 232 drives the limiting plate 233 to disengage from the rotating ring 25 and unlock. After being released, the first spring 231 returns to its original position, pushing the pressing plate 232 and the limiting plate 233 back to their original positions. The limiting plate 233 then engages with the rotating ring 25 for limiting. The piston 33 is fixed inside the outer shell 31, stably transmitting the elastic force of the second spring 32 to achieve precise movement of the locking block 35.

[0015] The outer side of the connector 34 is fixedly connected to the inner side of the housing 31. After being fixed, the connector 34 can slide stably inside the housing 31 and can cooperate with the piston 33 to adjust its position, ensuring that the locking block 35 is accurately locked into the slot. The outer side of the limiting ring 36 is rotatably connected to the top of the housing 31. The rotatable connection allows the limiting ring 36 to be flexibly adjusted in position, which is convenient to limit the piston 33 or the connector 34 after installation to prevent the parts from loosening. The outer side of the connector 34 is slidably connected to the inner side of the limiting ring 36. The sliding fit allows the connector 34 to move smoothly inside the limiting ring 36, which does not hinder the movement of the connector 34 and can be limited after the limiting ring 36 rotates. The outer side of the rotating ring 25 is rotatably connected to the inner side of the support arm 28. The rotatable connection allows the rotating ring 25 to drive the support arm 28 to rotate synchronously, ensuring that the support arm 28 can be smoothly unfolded or retracted, realizing the folding function of the anti-tipping mechanism. Specifically, the connector 34 is fixed to the inside of the housing 31 and can slide stably. It works with the piston 33 to adjust its position and ensure that the locking block 35 is accurately engaged in the slot. The limiting ring 36 is rotatably connected to the top of the housing 31. After installation, it can be rotated to limit the piston 33 or the connector 34 to prevent loosening. The connector 34 and the limiting ring 36 slide together without hindering their movement and can be limited. The rotating ring 25 is rotatably connected to the support arm 28, which drives the support arm 28 to unfold or retract, realizing the folding of the anti-tipping mechanism.

[0016] The outer side of the rotating ring 25 is fixedly connected to one side of the fixed block 22. After fixing, the rotating ring 25 rotates stably based on the fixed block 22, preventing deviation during rotation and ensuring precise linkage with the support arm 28. The outer side of the rotating shaft 24 is rotatably connected to the support arm 28, providing rotational support for the support arm 28, allowing the support arm 28 to rotate flexibly, facilitating the expansion of the support range or folding to reduce its volume. The outer side of the fixed block 22 is fixedly connected to the top of the support arm 28. After fixing, the fixed block 22 and the support arm 28 form a whole, ensuring... The components on the fixed block 22 can stably drive the support arm 28 to move, ensuring the stability of the mechanism. The outer side of the rotating shaft 27 is fixedly connected to the inner side of the limiting plate 233. After fixing, the rotating shaft 27 provides support for the limiting plate 233, allowing the limiting plate 233 to slide stably and accurately limit the rotation ring 25. The outer side of the limiting plate 233 is slidably connected to the inner side of the rotation ring 25. The slidable connection allows the limiting plate 233 to smoothly engage or disengage from the rotation ring 25, realizing the limiting and unlocking of the rotation ring 25, ensuring the stability of the mechanism's folding and unfolding action. Specifically, the rotating ring 25 is fixed to one side of the fixed block 22, and rotates stably based on it, precisely linking with the support arm 28. The rotating shaft 24 supports the flexible rotation of the support arm 28, helping the mechanism to expand its range or fold to reduce its volume. The fixed block 22 and the support arm 28 are fixed as a whole, stably driving its movement. The rotating shaft 27 supports the stable sliding of the limiting plate 233, allowing it to smoothly engage or disengage from the rotating ring 25, achieving limiting and unlocking.

[0017] The implementation principle of this application embodiment is as follows: When the drone is working in the field, it may tip over due to uneven road surface when landing. The folding anti-tipping mechanism 2 rotates on the surface of the rotating shaft 24 through the support arm 28, so that the bottom support foot 5 can better contact the ground. By connecting the limiting component 23 at the top of the fixing block 22 on the outside of the support frame 1, the pressing plate 232 is pressed to make the limiting plate 233 tilt around the rotating shaft 27, the rotating ring 25 is released, and different angles are adjusted to adapt to drones of different sizes.

[0018] For installing drones of different sizes, the support frame 1 has a quick-release mechanism 3 installed inside. The inner side of the limiting ring 36 has a groove. By rotating the top limiting ring 36, the connector 34 with the outer locking block 35 is installed into the inner side of the outer shell 31. The outer shell 31 has a groove on the outside. Then, by rotating the limiting ring 36, the locking block 35 is locked on the top of the limiting ring 36. The spring 32 inside the outer shell 31 is reset, firmly locking the connector 34 and achieving a fixed connection.

[0019] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A detachable landing gear for a multi-rotor unmanned aerial vehicle used for teaching, comprising a support frame (1), characterized in that: The support frame (1) is fixedly connected to a folding anti-tipping mechanism (2) on the outside, and a quick-release mechanism (3) is fixedly connected to the inside of the support frame (1). The quick-release mechanism (3) is fixedly connected to a base (4) at the bottom, and the folding anti-tipping mechanism (2) is fixedly connected to a support foot (5) at the bottom. The folding anti-tipping mechanism (2) includes a mounting frame (21), one side of which is fixedly connected to the outside of the support frame (1). A fixing block (22) is fixedly connected to the outside of the mounting frame (21). A limit assembly (23) is fixedly connected to the top of the fixing block (22). A rotating shaft (24) is rotatably connected inside the fixing block (22). A rotating ring (25) is fixedly connected to the outside of the rotating shaft (24). A positioning plate (26) is fixedly connected to the top of the fixing block (22). A rotating shaft (27) is rotatably connected to the inside of the positioning plate (26). A support arm (28) is rotatably connected to the outside of the mounting frame (21).

2. The detachable landing gear of a teaching multi-rotor UAV according to claim 1, characterized in that: The quick-release mechanism (3) includes a housing (31), the outer side of which is fixedly connected to the inner side of the support frame (1), a second spring (32) is slidably connected to the inner side of the housing (31), a piston (33) is fixedly connected to the top of the second spring (32), a connector (34) is slidably connected to the top of the piston (33), a locking block (35) is fixedly connected to the outer side of the connector (34), and a limit ring (36) is rotatably connected to the outer side of the housing (31).

3. The detachable landing gear of a teaching multi-rotor UAV according to claim 1, characterized in that: The limiting component (23) includes a spring (231), the bottom of which is fixedly connected to the top of the fixing block (22), and a pressing plate (232) is fixedly connected to the top of the spring (231). A limiting plate (233) is fixedly connected to one side of the pressing plate (232).

4. The detachable landing gear of a teaching multi-rotor UAV according to claim 2, characterized in that: The outer side of the piston (33) is fixedly connected to the inner side of the housing (31), and the outer side of the connector (34) is fixedly connected to the inner side of the housing (31).

5. The detachable landing gear of a teaching multi-rotor UAV according to claim 2, characterized in that: The outer side of the limiting ring (36) is rotatably connected to the top of the outer shell (31), and the outer side of the connector (34) is slidably connected to the inner side of the limiting ring (36).

6. The detachable landing gear of a teaching multi-rotor UAV according to claim 1, characterized in that: The outer side of the rotating ring (25) is rotatably connected to the inner side of the support arm (28), and the outer side of the rotating ring (25) is fixedly connected to one side of the fixing block (22).

7. The detachable landing gear of a teaching multi-rotor UAV according to claim 1, characterized in that: The outer side of the rotating shaft (24) is rotatably connected to a support arm (28), and the outer side of the fixing block (22) is fixedly connected to the top of the support arm (28).

8. The detachable landing gear of a teaching multi-rotor UAV according to claim 3, characterized in that: The outer side of the rotating shaft (27) is fixedly connected to the inner side of the limiting plate (233), and the outer side of the limiting plate (233) is slidably connected to the inner side of the rotating ring (25).

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