Reed-based foldable propeller of unmanned aerial vehicle

Abstract

The invention relates to the technical field of foldable propellers, and provides an unmanned aerial vehicle foldable propeller based on a reed structure, the unmanned aerial vehicle foldable propeller comprises a propeller hub, blades, a main reed and an auxiliary reed, and the auxiliary reed is connected with a transmission locking mechanism; a main reed is fixedly arranged on one side of the propeller hub, and the main reed is attached to the propeller blades when the propeller blades are in a folded state so as to provide elastic force needed by unfolding of the propeller blades; an auxiliary reed and a transmission locking mechanism are fixedly arranged on the other side of the propeller hub, and the transmission locking mechanism is connected with the auxiliary reed through a connecting rod; and the transmission locking mechanism is used for controlling the movement of the auxiliary reed according to the rotating signal of the propeller and locking the blades in the rotating state of the propeller. According to the propeller structure, a rapid and reliable automatic unfolding mechanism is achieved through the design of the reeds, and the response speed of the propeller in the starting process is effectively increased; and meanwhile, higher structural stability is achieved in the flight process, and the flight deviation problem caused by paddle shaking is remarkably solved.

Description

Technical Field

[0001] The present invention relates to the technical field of foldable propellers, and more specifically, to a drone foldable propeller based on reed. Background Art

[0002] The statements in this section merely provide background technical information related to the present invention and do not necessarily constitute prior art.

[0003] Currently, foldable drones have been widely used in various scenarios such as emergency rescue, military reconnaissance, and field survey due to their portability and rapid deployment capabilities. To meet the requirements of tube launching and limited storage and transportation space, the folding structure of the propeller has become one of the key components. Compared with traditional non-foldable integral propellers, foldable propellers can significantly reduce the volume of the drone in the non-working state, improve the storage efficiency and transportation convenience, and thus become the mainstream configuration form of current foldable drones.

[0004] Existing foldable propellers still have many technical defects in practical applications. On the one hand, the response speed of some foldable propellers during the unfolding process is slow, making it difficult to meet the rapid startup requirements of high-timeliness tasks. Especially in emergencies, a delayed unfolding is extremely likely to lead to the failure of drone deployment and affect the timely execution of tasks. On the other hand, after the propeller is unfolded, the blades are prone to shaking or jitter during high-speed rotation, seriously affecting the flight stability and accuracy, and further resulting in blurred image acquisition, increased navigation deviation, and even potential safety hazards such as increased structural fatigue and increased vibration of the whole machine. Therefore, there is an urgent need for a foldable propeller structure with rapid unfolding ability and high stability to meet the high-performance operation requirements of drones in complex environments. Summary of the Invention

[0005] To solve the problems of slow unfolding response speed and poor flight stability of existing foldable propellers, the present invention proposes a drone foldable propeller based on a reed structure. This propeller structure realizes a fast and reliable automatic unfolding mechanism through the design of the reed, effectively improving the response speed of the propeller during startup; at the same time, it has higher structural stability during flight, significantly reducing the flight deviation problem caused by blade shaking. The present invention can be widely applied to drone application scenarios with high requirements for rapid response and high-precision flight, and has significant technological breakthrough and promotion value.

[0006] To achieve the above object, the present invention adopts the following technical solutions: One or more embodiments provide a drone foldable propeller based on a reed, including a hub, blades, a main reed, and a secondary reed, and the secondary reed is connected with a transmission locking mechanism; On one side of the propeller hub, a main reed is fixedly arranged. The main reed abuts against the propeller blade in the folded state of the propeller blade to provide the elastic force required for the unfolding of the propeller blade. On the other side of the propeller hub, a secondary reed and a transmission locking mechanism are fixedly arranged. The transmission locking mechanism is connected to the secondary reed through a connecting rod; the transmission locking mechanism is used to control the movement of the secondary reed according to the signal of the rotation of the propeller and lock the propeller blade in the rotating state of the propeller.

[0007] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention realizes the rapid unfolding and stable locking of the propeller through the cooperation of the main reed and the secondary reed; the main reed is arranged on the inner side of the propeller blade. The main reed stores elastic force in the folded state of the propeller blade and quickly releases the elastic force after the unmanned aerial vehicle leaves the launch tube, pushing the propeller blade to unfold outward to realize the rapid automatic unfolding of the propeller; the arranged secondary reed can move along a preset path under the drive of the transmission locking mechanism, drive the connecting rod to drive the secondary reed to act according to the rotation state of the propeller blade, and press the secondary reed into the corresponding part of the propeller blade when the propeller rotates to realize locking. The above structural cooperation can realize rapid deployment and position locking after the propeller unfolds, effectively suppress the shaking during the rotation of the propeller blade, improve the flight stability, and enhance the structural reliability and mission execution accuracy during the flight of the unmanned aerial vehicle.

[0008] The advantages of the present invention and the advantages of the additional aspects will be described in detail in the following specific embodiments. Brief Description of the Drawings

[0009] The specification drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute a limitation to the present invention.

[0010] Figure 1 It is a schematic structural diagram of a foldable propeller of an unmanned aerial vehicle based on a reed in Embodiment 1 of the present invention; Figure 2 It is a schematic diagram of a foldable propeller of an unmanned aerial vehicle based on a reed in Embodiment 1 of the present invention folded in the launch barrel; Figure 3 It is a partial enlarged view of end A of a foldable propeller of an unmanned aerial vehicle based on a reed in Embodiment 1 of the present invention folded in the launch barrel; Figure 4 It is a schematic diagram of the arrangement of the main reed of the propeller in Embodiment 1 of the present invention; Figure 5 It is a schematic structural diagram of a bionic fairing in Embodiment 1 of the present invention; Figure 6 It is a schematic diagram of an intermediate state when the propeller in Embodiment 1 of the present invention unfolds from the folded state; Figure 7 It is a schematic diagram of the state of the propeller after unfolding in Embodiment 1 of the present invention; Among them, 1. propeller hub, 2. propeller clamp, 3. propeller blade, 4. main reed, 5. screw, 6. nut, 7. bionic fairing, 8. controller, 9. micro-motor gear set, 10. cam gear mechanism, 11. micro-battery, 12. connecting rod, 13. connecting rod fixing seat, 14. shoulder, 15. spring, 16. auxiliary reed. Specific implementation manners

[0011] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0012] It should be noted that the following detailed descriptions are all exemplary and are intended to provide further descriptions of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs.

[0013] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary implementation manners according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, 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. It should be noted that, without conflict, the various embodiments and features in the embodiments of the present invention can be combined with each other. The embodiments will be described in detail below in conjunction with the accompanying drawings.

[0014] Embodiment 1 In the technical solutions disclosed in one or more embodiments, as Figures 1 to 7 shown, a foldable propeller of a drone based on a reed includes a propeller hub 1, a propeller blade 3, a main reed 4, and an auxiliary reed 16. The auxiliary reed 16 is connected with a transmission locking mechanism; One side of the propeller hub 1 is fixedly provided with the main reed 4. The main reed 4 abuts against the propeller blade 3 in the folded state of the propeller blade 3 to provide the elastic force required for the propeller blade 3 to unfold; The other side of the propeller hub 1 is fixedly provided with the auxiliary reed 16 and the transmission locking mechanism. The transmission locking mechanism is connected with the auxiliary reed 16 through a connecting rod 12; the transmission locking mechanism is used to control the movement of the auxiliary reed 16 according to the signal of the rotation of the propeller and lock the propeller blade 3 in the rotating state of the propeller.

[0015] In this embodiment, the main spring leaf 4 and the auxiliary spring leaf 16 cooperate to achieve the rapid deployment and stable locking of the propeller; the main spring leaf 4 is arranged inside the blade 3, and the main spring leaf 4 stores elastic force in the folded state of the blade 3, and quickly releases the elastic force after the drone is launched and leaves the launch tube, pushing the blade 3 to expand outwards to achieve the rapid automatic deployment of the propeller; the arranged auxiliary spring leaf 16 can move along a preset path under the drive of the transmission locking mechanism, drive the connecting rod 12 to drive the auxiliary spring leaf 16 to act according to the rotation state of the blade 3, and press the auxiliary spring leaf 16 into the corresponding part of the blade 3 when the propeller rotates to achieve locking. The above structural cooperation can achieve rapid deployment and position locking after the propeller is deployed, effectively suppress the shaking during the rotation of the blade 3, improve the flight stability, and enhance the structural reliability and mission execution accuracy during the flight of the drone.

[0016] In some embodiments, the blade 3 can be foldably fixed on the hub 1; the end of the hub 1 can be set as a U-shaped-like structure, and an accommodation space for the fixed end of the blade 3 is formed in the middle of the side wall of the U-shaped-like end. The first through holes are respectively arranged on the U-shaped-like side wall and the fixed end of the blade 3, a screw rod 5 is arranged through the first through holes, the screw rod 5 is fixed by a nut 6, and the fixed end of the blade 3 is fixed in the middle of the U-shaped-like side wall; the blade 3 can be folded with the screw rod 5 as the central axis; Among them, the screw rod 5 can adopt a double-headed screw rod, which can improve the flexibility of assembly; Another achievable structure is that through holes are respectively arranged on the U-shaped-like side wall and the fixed end of the blade 3, and a rivet is arranged to fix the fixed end of the blade 3 in the U-shaped side wall by riveting; One achievable structure is that the main spring leaf 4 is set as a straight sheet-shaped elastic sheet, and the end of the sheet-shaped structure is upturned for abutting against the blade 3; Another achievable structure is as Figure 4 shown, the main spring leaf 4 is an arched sheet-shaped structure, the two sides are set as straight sheet-shaped structures, which are attached to the outer surface of the hub 1 for fixing the main spring leaf 4; the middle structure bends outwards relative to the two sides, forming an arched curved surface relative to the two sides, forming an arched sheet-shaped structure that naturally upturns to abut against the folded blade 3. The middle part of the arched sheet-shaped structure has a preset curvature in the state of not being loaded, and has good elastic deformation ability; The two sides of the arched sheet-shaped main spring leaf 4 are attached to the outer surface of the hub 1 to provide elastic force support when the blade 3 is folded. The upturned middle structure design of the main spring leaf 4 forms an elastic deformation area. When the blade 3 is in the folded state and presses the main spring leaf 4, the middle upturned area first undergoes elastic deformation, thereby storing sufficient elastic force; when the blade 3 is released, the deformed area in the middle section quickly returns to its original shape and releases the elastic force to push the blade 3 to expand.

[0017] Achievable, as Figure 4As shown, the blade 3 and the main spring piece 4 can be jointly fixed on the hub 1 through the screw 5 and the nut 6, enabling the blade 3 to be folded and unfolded relative to the hub 1; Optionally, the main spring piece 4 can be made of 50CrMo chromium alloy spring steel, which has good elastic modulus, high elastic limit and high fatigue resistance.

[0018] Optionally, the thickness of the main spring piece 4 is controlled in the range of 0.2 - 0.5 mm; The main spring piece 4 of this embodiment is made of chromium alloy spring steel and has excellent mechanical properties. Its good elastic modulus can continuously provide stable elastic force during operation to ensure the reliability of the blade 3 unfolding; the high elastic limit makes the spring piece not easily undergo permanent deformation under large external forces, effectively extending the service life; the excellent elastic stability enables it to maintain consistent elastic performance under different temperature, humidity and pressure environments, ensuring the reliable operation of the propeller under complex working conditions; in addition, this material has good fatigue resistance, can withstand frequent folding and unfolding cycles, reduce losses and maintenance frequency, and improve the working efficiency and reliability of the whole machine.

[0019] Furthermore, a propeller clamp 2 is connected and arranged at the center point of the hub 1, and is connected to the drone through the propeller clamp 2; Optionally, a threaded hole is provided at the center point of the hub 1, the threaded end on the propeller clamp 2 is inserted into the threaded hole of the hub 1, and the propeller clamp 2 is connected to the rear - push motor shaft on the drone to ensure concentricity with the motor shaft.

[0020] The propeller clamp 2 is used to connect the hub 1 and the drone. It can be realized that one end of the propeller clamp 2 is provided with a threaded end that can be screwed into the central hole of the hub 1, and the other end is a hole - type structure that can be inserted into the rear - push motor shaft, so that the propeller clamp 2 is concentrically installed with the motor shaft, thereby ensuring the rotational stability and coaxial accuracy between the propeller assembly and the motor output end.

[0021] In the above - mentioned structure, during the drone launch preparation stage, the propeller is in a folded state and is stored in the launch barrel together with the drone. At this time, the side wall of the aircraft launch barrel effectively restricts the unfolding of the blade 3, as Figure 2 shown. This propeller is a pusher propeller. Inside the launch barrel, the propeller is located at the innermost end. When the aircraft is launched, the propeller is shot out along with the drone along the launch barrel, and the launch direction is as Figure 2 shown by the arrow in. Figure 3 is Figure 2 a partial enlarged view of the end A area in. When the drone exits the barrel, there is no longer the restraint of the launch barrel outside the blade 3. The blade 3 unfolds under the elastic force of the main spring piece 4. The blade 3 rotates with the screw 5 as the rotation axis. When the trailing edge of the blade 3 contacts the auxiliary spring piece 16, it indicates the end of unfolding. At this time, the auxiliary spring piece 16 plays a role in preventing the blade 3 from unfolding at too large an angle, as Figure 7 shown.

[0022] In some embodiments, the auxiliary spring leaf 16 and the main spring leaf 4 are oppositely arranged on the hub 1, and act on the opposite surfaces of the blade 3 respectively to realize the unfolding action and limit of the blade 3. As Figure 1 shown, the auxiliary spring leaf 16 is arranged on the other side opposite to the main spring leaf 4. The auxiliary spring leaf 16 is nested outside the hub 1 to form a unique auxiliary spring leaf group structure.

[0023] Furthermore, the auxiliary spring leaf 16, the connecting rod 12 and the transmission locking mechanism are connected in sequence. The transmission locking mechanism includes a control device, a driving motor, a micro-motor gear set 9 and a cam gear mechanism 10 connected in sequence. The control device includes a controller 8 and a speed measurement sensor; The controller 8 controls the driving motor to work according to the rotation speed of the propeller measured by the speed measurement sensor, drives the cam gear mechanism 10 to act through the micro-motor gear set 9, drives the connecting rod 12 to act through the cam gear mechanism 10, and drives the auxiliary spring leaf 16 to move through the connecting rod 12; after the auxiliary spring leaf 16 extends out, it abuts against the blade 3 to fix the blade 3 and improve the stability of the propeller action.

[0024] It is achievable that the surface of the blade 3 is provided with a first groove corresponding to the auxiliary spring leaf 16, and the size of the first groove is adapted to the size of the moving end of the auxiliary spring leaf 16, so that after the auxiliary spring leaf 16 extends out, it can cooperate with the first groove to realize the locking of the position of the blade 3; In the default position of the auxiliary spring leaf 16, that is, in the unlocked state, the cooperation between the auxiliary spring leaf 16 and the first groove makes the unfolding angle of the blade 3 within 130 degrees. After locking, the center lines of the two blades 3 are parallel. That is, when the auxiliary spring leaf 16 just touches the first groove, the unfolding angle of the blade 3 is within 130 degrees. As the auxiliary spring leaf 16 extends out, the auxiliary spring leaf 16 slides in the first groove and gradually enters the first groove, which can gradually reduce the unfolding angle of the blade 3 until the auxiliary spring leaf 16 abuts against the bottom of the first groove, and the unfolding angles of the two blades 3 form a flat angle and are locked.

[0025] Furthermore, the micro-motor gear set 9 includes a set of small module gears and a planetary reduction gear structure. The small module gears are fixedly connected to the output shaft of the driving motor and are used to convert the high-speed rotation of the motor into medium-low speed and high-torque output; the planetary reduction mechanism is coaxially connected to the input end of the cam gear mechanism 10 to ensure the smoothness of the power output process and the accuracy of gear meshing.

[0026] The overall structure of the micro-motor gear set 9 in this embodiment is compact and is installed inside the hub 1 or its adjacent structure, with high space adaptability.

[0027] Furthermore, the cam gear mechanism 10 includes a driven gear and a cam fixed to the output end of the micro-motor gear set 9. The driven gear is linked to the cam, and an eccentric contour is provided on the outer periphery of the cam for converting rotational motion into periodic axial movement. Optionally, the cam of the cam gear mechanism 10 can be connected to the connecting rod 12 through a shaft pin. As the cam rotates, it drives the connecting rod 12 to perform linear reciprocating motion along a preset direction, thereby driving the auxiliary reed 16 to extend or retract.

[0028] Optionally, the auxiliary reed 16 can be made of a carbon fiber corrugated reed; the carbon fiber material has properties such as light weight, high strength, and corrosion resistance. The corrugated reed made of it can not only significantly enhance the strength of the overall structure but also provide an additional locking force under specific working conditions.

[0029] The transmission locking mechanism of this embodiment has a simple structure, a fast response speed, good mechanical stability and repetitive motion accuracy, and can effectively lock the position of the blade 3 by the auxiliary reed 16 at high rotational speeds. By real-time monitoring of the rotational speed of the blade 3, once the set threshold is reached, the transmission locking mechanism responds quickly, drives the auxiliary reed group to move, forms a reliable redundant protection mechanism, further improves the stability of the blade 3 during flight, effectively prevents accidental folding of the propeller, reduces vibration and noise, reduces vibration and impact and thus reduces component wear, ensures stable power output, and improves the flight safety of the drone.

[0030] In a further technical solution, the controller 8 is also connected with a plurality of sensor components. The sensor components include but are not limited to acceleration sensors, temperature sensors, etc. A multi-modal perception network formed by the sensors can be used to collect various data of the propeller under different working states in real time.

[0031] The total controller of the drone, simply referred to as the flight control, can integrate and analyze these sensing data through an advanced sensor fusion algorithm, so as to achieve comprehensive monitoring and precise control of the propeller state. When the acceleration sensor detects abnormal vibration, combined with the data of the rotational speed sensor, the flight control can quickly determine whether the problem is caused by sudden air flow change, component loosening or excessive temperature, and make corresponding adjustments in a timely manner.

[0032] In a further technical solution, a connecting rod fixing seat 13 is also fixedly arranged on the blade clamp 2. A second through hole is arranged on the connecting rod fixing seat 13, and the inner wall of the second through hole matches the outer wall of the connecting rod 12, so that the connecting rod 12 can reciprocally slide through the second through hole. In this embodiment, a connecting rod fixed seat 13 is provided, which can guide and limit the movement path of the connecting rod 12, thereby improving the force transmission accuracy and stability of the transmission locking mechanism during the operation of the driving auxiliary spring piece 16. As an intermediate support structure, the connecting rod fixed seat 13 effectively prevents the connecting rod 12 from shaking, shifting or being thrown off during the process of being stressed or rotating. Especially during the flight of the drone under severe vibration or high rotational speed conditions, it can ensure that the connecting rod 12 moves stably and linearly along the set direction, improving the consistency and reliability of the movement of the auxiliary spring piece 16, and further enhancing the working stability and anti-interference ability of the locking structure.

[0033] In some embodiments, a shoulder 14 is also fixedly provided on the connecting rod 12, and a spring 15 is nested on the connecting rod 12 between the shoulder 14 and the connecting rod fixed seat 13.

[0034] Specifically, the shoulder 14 is a convex structure provided on the connecting rod 12; In this embodiment, the auxiliary spring piece 16 is nested outside the hub 1, the auxiliary spring piece 16 is fixedly connected to the connecting rod 12, and the connecting rod 12 abuts against the compound cam gear mechanism 10. To prevent the connecting rod 12 and the auxiliary spring piece 16 from being thrown off under the action of centrifugal force, a spring 15 is nested outside the connecting rod 12 between the connecting rod fixed seat 13 and the shoulder 14. The spring 15 can adjust the movement of the auxiliary spring piece 16; when the propeller unfolds, in order to avoid the unfolding angle of the blade 3 being too large and affecting the rotation of the propeller by centrifugal force after the motor starts, the auxiliary spring piece 16 abuts against the blade 3 to limit the unfolding angle of the propeller and ensure that the unfolding angle of the blade 3 is maintained within 130 degrees.

[0035] The unfolding angle of the blade 3 in this embodiment is defined as: the transformed angle after unfolding from the folded state, that is, the included angle between the center line of the blade 3 in the folded state and the center line of the blade 3 after unfolding; In a further technical solution, the controller 8 controls the driving motor to work according to the rotational speed of the propeller measured by the speed sensor. The rotational speed can be set to exceed a set value. The transmission locking mechanism triggers the locking mechanism according to the lock-rotor control logic preset by the flight control system on the drone; Specifically, the set value of the rotational speed can be set to 1000 revolutions per minute. When the rotational speed exceeds the set value (1000 revolutions per minute), the locking mechanism is triggered; Optionally, a micro battery 11 can be provided to supply power to the transmission locking mechanism; In a further technical solution, to further improve the working efficiency and operation stability of the blade 3, a bionic fairing 7 is provided at the center point of the upper surface of the hub 1. The bionic fairing 7 is an axially symmetric hollow shell that tapers upward. Multiple groups of shark skin texture grooves are evenly distributed on the surface of the shell of the bionic fairing 7 along the circumferential and axial directions. The shark skin texture grooves are arranged from bottom to top with a set spacing as the change gradient to form the micro-texture feature structure of the shark skin surface; On the surface of the housing of the bionic fairing 7, the shark skin texture grooves are arranged layer by layer along the axial direction. The set spacing between layers can be set to 8 mm to 15 mm. Preferably, the set spacing is set to 10 mm; each layer of shark skin texture grooves is evenly arranged in a circle along the circumference.

[0036] Furthermore, for the multiple layers of shark skin texture grooves provided on the surface of the bionic fairing 7, the depth of the shark skin texture grooves varies between 0.1 mm and 0.3 mm, and decreases sequentially from bottom to top along the surface of the bionic fairing 7 in a gradient layout, for optimizing the flow characteristics of different airflow regions; Specifically, the bionic fairing 7 is a hollow conical housing structure, and a slot is provided at the position corresponding to the setting of the connecting rod 12. The slot is used to provide space for the reciprocating movement of the connecting rod 12; the inside of the hollow conical housing is used to accommodate the components of the transmission locking mechanism, providing reliable protection for the control device of the transmission locking mechanism, the micro-motor gear set 9, the cam gear mechanism 10, and the micro-battery 11; effectively blocking the intrusion of dust and water stains, ensuring that each component operates in a stable environment.

[0037] In this embodiment, the bionic fairing 7 is installed on the upper part of the hub 1 and can be fixedly positioned by connecting with the paddle clip 2; a plurality of micro-grooves are evenly distributed on the surface of the housing of the bionic fairing 7 along the circumferential and axial directions. These grooves are arranged from bottom to top in a gradient with a spacing of 10 mm, simulating the micro-texture characteristics of the shark skin surface and having a good aerodynamic optimization effect.

[0038] The special texture of the shark skin surface provided on the fairing surface in this embodiment has the characteristics of reducing water flow resistance and improving swimming efficiency, and can effectively solve aerodynamic problems.

[0039] On the one hand, the shark skin texture grooves on the fairing surface are distributed from bottom to top according to the gradient of the set spacing, and can highly adapt to the complex and changeable airflow characteristics at different flight speeds: in the medium and low-speed flight stage, the grooves can reduce the turbulence of the airflow attached to the fairing surface and improve the airflow slip effect; when flying at high speed, the grooves can interrupt the vortex structure appearing in the boundary layer, reduce airflow separation, and improve the overall stability of the propeller's thrust / pull force output; thereby reducing the pressure difference and interference between the fairing and the airflow, and significantly reducing the vibration and noise caused by uneven flow.

[0040] Through this design, the air resistance can be significantly reduced, ensuring that the blade 3 maintains good stability during high-speed rotation, thereby greatly improving the working efficiency of the propeller and comprehensively optimizing the flight performance of the drone. It can significantly reduce the vibration and noise generated during the operation of the propeller. By finely optimizing the airflow, the bionic fairing 7 reduces the irregular impact of the airflow on the blade 3, making the operation of the propeller reach a highly stable state. This stable operation not only improves the flight comfort and controllability but also effectively reduces the wear of the propeller components, thus significantly extending the service life of the propeller and reducing the maintenance cost and replacement frequency.

[0041] On the other hand, the fairing improves the airflow environment around the propeller. With the same power input, the propeller equipped with the fairing can generate greater lift or thrust: the fairing reduces the airflow interference and resistance loss through aerodynamic optimization. At the same time, the shark-skin bionic grooves on its surface enhance the boundary layer control effect, making the airflow act on the blade 3 more stably and concentratedly, thereby improving the overall propulsion efficiency. In the application scenario of the drone, this means that the propeller can generate greater lift, enabling the drone to have the ability to carry heavier loads or fly farther distances while carrying the same load. This performance improvement not only expands the application range of the drone but also enhances its mission execution ability and economic benefits.

[0042] The working method of the above-mentioned reed-based foldable propeller for drones is specifically described as follows: In the folded state of the propeller, the outer side of the blade 3 is under the action of the barrel wall of the launch tube and remains in the folded state. At the same time, the main reed 4 arranged on the inner side of the blade 3 abuts against the blade 3, and the main reed 4 stores elastic force, as Figure 1 shown in the state; After the drone is launched and leaves the launch tube, the elastic force is quickly released. As Figure 2 shown, the arrow direction is the direction in which the drone exits the tube. The drone is on the inner side of the folded blade 3. The main reed 4 pushes the blade 3 to unfold outward, realizing the rapid automatic unfolding of the propeller. At the same time, the drone body first exits the tube and maintains an inclined upward angle. Under the action of wind resistance and gravity, as Figure 6 shown, relative to Figure 1 the folded state, Figure 6 the blade 3 in The propeller starts to rotate under the action of the motor shaft of the drone. It is driven by the propeller clamp 2. The flight path of the drone body after it first exits the tube is a parabola. After passing the highest point of the parabola, the drone body adjusts under the action of gravity so that the propeller blade 3 is on top and the drone body is at the bottom. The propeller blade 3 of the propeller rotates at a basically horizontal angle. When it reaches a certain rotational speed, relying on the power provided by the micro battery 11, the small gear in the micro motor gear set 9 starts to rotate driven by the drive motor. Driven efficiently by the small gear, the cam gear mechanism 10 rotates smoothly, and the cam exerts its mechanical effect to push open the connecting rod 12. The auxiliary reed 16 extends outward along the established motion track under the push of the connecting rod 12 and finally snaps into the first groove on the surface of the propeller blade 3. Through this series of precise mechanical actions, the propeller blade 3 is reliably locked. As Figure 7 shown in the state. In this locked state, the center lines of the two propeller blades 3 are parallel. This locking method can effectively resist the interference of complex factors such as vibration and airflow impact during flight, fundamentally avoiding the possible accidental folding of the propeller blade 3. At the same time, it reduces the unnecessary shaking of the propeller blade 3 during rotation, significantly reducing the vibration and noise levels, and further improving the working efficiency and running stability of the propeller blade 3.

[0043] Embodiment 2 Based on Embodiment 1, a drone is provided in this embodiment. The drone uses the foldable propeller of a drone based on a reed described in Embodiment 1.

[0044] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A reed-based foldable propeller for a drone, characterized in that: It includes a propeller hub, propeller blades, a main reed and a secondary reed, wherein the secondary reed is connected with a transmission locking mechanism; A main spring is fixedly arranged on one side of the propeller hub. When the propeller blade is folded, the main spring is pressed against the propeller blade to provide the elastic force required for the propeller blade to unfold. A secondary spring and a transmission locking mechanism are fixedly arranged on the other side of the hub, and the transmission locking mechanism is connected to the secondary spring through a connecting rod; the transmission locking mechanism is used to control the movement of the secondary spring according to the signal of propeller rotation, and lock the blades when the propeller is rotating.

2. A reed-based foldable propeller for a drone as claimed in claim 1, characterized in that: The main spring is an arched sheet structure, and the two sides are arranged as straight sheet structures, which are attached to the outer surface of the hub. The middle structure is bent outward relative to the two sides to form an arched arc surface relative to the two sides to abut against the folded blade.

3. A reed-based foldable propeller for a drone as claimed in claim 1, characterized in that: The transmission locking mechanism includes a control device, a drive motor, a micromotor gear set, and a cam gear mechanism connected in sequence, wherein the control device includes a controller and a speed sensor; The controller controls the driving motor to work according to the rotation speed of the propeller measured by the speed sensor, drives the cam gear mechanism to move through the micromotor gear set, the cam gear mechanism drives the connecting rod to move, and drives the secondary reed to move through the connecting rod; after the secondary reed is extended, it rests on the blade to fix the blade.

4. A reed-based foldable propeller for a drone as claimed in claim 1, characterized in that: The surface of the blade is provided with a first groove corresponding to the auxiliary spring, and the size of the first groove is adapted to the size of the moving end of the auxiliary spring.

5. The reed-based foldable propeller for a drone as claimed in claim 1, characterized in that: A connecting rod fixing seat is also fixedly arranged on the paddle clamp, and a second through hole is arranged on the connecting rod fixing seat. The inner wall of the second through hole matches the outer wall of the connecting rod, so that the connecting rod passes through the second through hole and slides back and forth.

6. A reed-based foldable propeller for a drone as claimed in claim 5, characterized in that: A shaft shoulder is also fixedly arranged on the connecting rod, and a spring is nested on the connecting rod between the shaft shoulder and the connecting rod fixing seat.

7. The reed-based foldable propeller for a drone as claimed in claim 1, characterized in that: A bionic fairing is arranged at the center point of the upper surface of the hub. The bionic fairing is an axisymmetric hollow shell that tapers upward. A plurality of groups of shark skin texture grooves are evenly distributed on the shell surface of the bionic fairing along the circumferential direction and the axial direction.

8. A reed-based foldable propeller for a drone as claimed in claim 7, characterized in that: The shark skin texture grooves are arranged from bottom to top at a set interval as a changing gradient to form a micro-texture characteristic structure on the shark skin surface.

9. A reed-based foldable propeller for a drone as claimed in claim 7, characterized in that: The depth of the shark skin texture grooves varies between 0.1mm and 0.3mm, and is arranged in a gradient manner from bottom to top along the surface of the bionic fairing.

10. The reed-based foldable propeller for a drone as claimed in claim 7, characterized in that: The bionic fairing is a hollow conical shell structure, with slots arranged corresponding to the setting positions of the connecting rods, and the slots are used to provide space for the reciprocating motion of the connecting rods; the interior of the hollow conical shell is used to accommodate the control device of the transmission locking mechanism, the micromotor gear set, the cam gear mechanism and the microbattery.

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