Locking and unfolding device for folding propeller blades of a drone

Abstract

The application discloses a locking and unfolding device for folding propeller blades of a UAV, and relates to the technical field of unmanned aerial vehicles. The device comprises a mounting ring, the outer side of the mounting ring is provided with a mounting ring groove, the inner side of the mounting ring is provided with a positioning arc groove, the bottom of the mounting ring is provided with a rotating ring mechanism, a plurality of propeller assemblies are arranged on the mounting ring groove, the propeller assembly comprises a positioning block mechanism, a folding arm mechanism, a driving motor, a propeller mechanism, a locking block mechanism, a folding adjusting mechanism and a linkage mounting rod mechanism, the positioning block mechanism is arranged on the mounting ring groove, the folding arm mechanism is arranged on the side of the positioning block mechanism, the driving motor is arranged on the lower part of the folding arm mechanism, the propeller mechanism is arranged on the upper part of the folding arm mechanism, the output shaft of the driving motor is connected with the propeller mechanism, the locking block mechanism is arranged on the folding arm mechanism, and the folding adjusting mechanism is arranged between the locking block mechanism and the propeller mechanism. The application improves the locking and unfolding efficiency of the propeller blades.

Description

Technical Field

[0001] This invention relates to the field of unmanned aerial vehicle (UAV) technology, specifically a locking and unfolding device for a folding propeller blade used in UAVs. Background Technology

[0002] Folding propellers are widely used in multi-rotor drones because they can retract their blades when not in operation, reducing the space occupied by the aircraft during parking and transportation. Existing folding propeller structures typically rely on centrifugal force for deployment. After the motor starts, the blades are thrown to the working position by the centrifugal force generated by rotation, and then naturally retract by gravity or airflow resistance after stopping. While this passive folding and deployment method is simple in structure, it has significant drawbacks: First, insufficient centrifugal force at low speeds prevents the blades from fully deploying, leading to unstable lift output and increased vibration; second, the lack of a reliable deployment locking mechanism means that the blades may wobble or unexpectedly fold back when disturbed by airflow or fluctuations in speed during flight, posing a serious safety hazard; and third, the folding and deployment actions cannot be actively controlled, making it impossible to automatically retract and deploy them on the ground as needed for the mission.

[0003] Some existing solutions use spring or linkage mechanisms to assist blade deployment, which improves deployment reliability to some extent. However, switching between the folding and unfolding locking states usually requires operating each blade individually, which is cumbersome, inefficient, and makes it difficult to achieve synchronized movement of all blades. In addition, the blade installation positions are mostly fixed, which cannot be flexibly adjusted according to changes in flight missions or payloads, resulting in insufficient adaptability.

[0004] Therefore, there is an urgent need for a device that can actively control the folding and unfolding of propellers and has a reliable locking function, so as to realize the state switching of multiple propellers in a synchronized and efficient manner, thereby improving the ease of use and flight safety of UAVs. Summary of the Invention

[0005] This invention provides a locking and unfolding device for folding propeller blades for unmanned aerial vehicles (UAVs), which solves the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A locking and unfolding device for a folding propeller blade used in a drone includes a mounting ring. The outer side of the mounting ring has a mounting ring groove, and the inner side has a positioning arc groove. A rotating ring mechanism is located at the bottom of the mounting ring. Several propeller assemblies are mounted on the mounting ring groove. Each propeller assembly includes a positioning block mechanism, a folding arm mechanism, a drive motor, a propeller mechanism, a locking block mechanism, a folding adjustment mechanism, and a linkage mounting rod mechanism. The positioning block mechanism is located on the mounting ring groove, the folding arm mechanism is located on the side of the positioning block mechanism, the drive motor is located at the lower part of the folding arm mechanism, and the propeller mechanism is located at the upper part of the folding arm mechanism. The output shaft of the drive motor is connected to the propeller mechanism. The locking block mechanism is located on the folding arm mechanism, the folding adjustment mechanism is located between the locking block mechanism and the blade mechanism, and the linkage mounting rod mechanism is located between the rotating ring mechanism and the locking block mechanism. The rotating ring mechanism is used to install the linkage mounting rod mechanism, adjust the state of the linkage mounting rod mechanism, adjust the unfolded and folded state of the folding arm mechanism, and adjust the position of the locking block mechanism. The drive motor is used to drive the blade mechanism to rotate, the locking block mechanism is used to adjust the state of the folding adjustment mechanism, the folding adjustment mechanism is used to adjust the folding and unfolded state of the blade mechanism, and the locking block mechanism is used to lock the unfolded state of the blade mechanism.

[0008] As a preferred embodiment of the present invention, the rotating ring mechanism includes a rotating ring rotatably connected to the bottom of the mounting ring. The rotating ring is provided with a plurality of mounting threaded through holes arranged at equal angles along the circumference in the vertical direction. The mounting threaded through holes are connected to the mounting ring. A first bolt is threadedly connected to the mounting threaded through holes, and the end of the first bolt contacts the mounting ring.

[0009] As a preferred embodiment of the present invention, the positioning block mechanism includes a positioning block disposed on the mounting ring groove, the positioning block and the mounting ring being slidably connected, a second bolt being disposed on the inner side of the mounting ring, the second bolt passing through the positioning arc groove, the second bolt and the positioning block being threadedly connected.

[0010] As a preferred embodiment of the present invention, the folding arm mechanism includes a deflection seat fixed to the side of the positioning block. The deflection seat is rotatably connected to the folding arm. The central axis of the deflection seat is parallel to the axis of the mounting ring. A limiting post is provided on one side of the folding arm on the deflection seat. The limiting post is located on the side of the deflection seat away from the linkage mounting rod mechanism. The limiting post is used to limit the maximum unfolding angle of the folding arm. The end of the folding arm away from the deflection seat is fixedly connected to the mounting plate. The drive motor is located at the bottom of the mounting plate.

[0011] As a preferred embodiment of the present invention, the blade mechanism includes a rotating shaft rotatably connected to a mounting plate, an output shaft of a drive motor and a rotating shaft coaxially and fixedly connected, a mounting top plate fixedly connected to the top of the rotating shaft, two symmetrically arranged folding seats fixedly connected to the sides of the mounting top plate, the rotation axis of the folding seats being horizontally arranged, and the folding seats rotatably connected to the blades.

[0012] As a preferred embodiment of the present invention, the locking block mechanism is provided in the vertical slide groove of the folding arm. A locking block is provided on the vertical slide groove. A compression spring is fixedly connected to the side of the locking block away from the deflection seat. The end of the compression spring away from the locking block is fixedly connected to the folding arm. The compression spring is located in the vertical slide groove. A lateral slide groove is provided on the side of the folding arm. The lateral slide groove and the vertical slide groove are connected. A tensioning mechanism is provided on the side of the locking block. A wedge-shaped locking rod is provided on the side of the tensioning mechanism near the folding arm. The end of the wedge-shaped locking rod near the folding arm is a wedge-shaped structure. Several wedge-shaped slots are provided on the side of the folding arm corresponding to the position of the wedge-shaped locking rod. The wedge-shaped locking rod and the wedge-shaped slots cooperate to enable the locking block to move unidirectionally to the end away from the deflection seat when the tensioning mechanism is adjusted without external tension.

[0013] As a preferred embodiment of the present invention, the tensioning mechanism includes a tension spring fixed inside the locking block. The tension spring is located on the side of the locking block away from the wedge-shaped lever. The end of the tension spring is fixedly connected to a first pull plate, which is located inside the locking block and is slidably connected to the locking block. The first pull plate is located inside the locking block, and a pull rod is fixedly connected to the side of the first pull plate away from the tension spring. The pull rod passes through the locking block and is slidably connected to the locking block. The end of the pull rod away from the first pull plate is fixedly connected to a second pull plate, which is fixedly connected to the wedge-shaped lever.

[0014] As a preferred embodiment of the present invention, the folding adjustment mechanism includes a first deflection seat fixed to the upper surface of the locking block, the first deflection seat being rotatably connected to a displacement linkage rod, the end of the displacement linkage rod away from the first deflection seat being rotatably connected to a second deflection seat, the second deflection seat being fixedly connected to an inner mounting ring, a rotating shaft passing through the inner mounting ring, the rotating shaft and the inner mounting ring being slidably connected, the outer side of the inner mounting ring being rotatably connected to an outer mounting ring, the side of the outer mounting ring being fixedly connected to two symmetrically arranged third deflection seats, the third deflection seats being rotatably connected to a displacement rod, the end of the displacement rod away from the third deflection seat being rotatably connected to a fourth deflection seat, and the fourth deflection seat being fixed to the bottom of the blade.

[0015] As a preferred embodiment of the present invention, the linkage mounting rod mechanism includes a displacement shaft located at the bottom of the locking block, the displacement shaft and the locking block being rotatably connected, the displacement shaft being rotatably connected to a linkage rod, and the end of the linkage rod away from the displacement shaft being rotatably connected to a mounting sleeve, the mounting sleeve passing through the linkage rod, the mounting sleeve and the linkage rod being rotatably connected, and a third bolt being provided on the mounting sleeve, the outer diameter of the third bolt being the same as the inner diameter of the mounting thread through hole, the third bolt being used to mount the mounting sleeve on the rotating ring.

[0016] The present invention has the following advantages:

[0017] 1. This invention utilizes the coordinated action of a rotating ring mechanism, a linkage mounting rod mechanism, a locking block mechanism, and a folding adjustment mechanism. By simply rotating the rotating ring, each blade assembly can synchronously complete the unfolding and retraction of the folding arm and the folding and unfolding of the blades. This makes operation convenient and significantly improves the efficiency of blade locking and unfolding.

[0018] 2. The locking block mechanism achieves one-way self-locking through the cooperation of the wedge-shaped lever and wedge-shaped slot in the compression spring and tensioning mechanism. It can reliably lock in the blade deployment state, preventing the blade from accidentally folding back during flight and significantly improving flight safety.

[0019] 3. The positioning block mechanism, through the sliding of the slider in the mounting ring groove and the locking engagement of the second bolt, can flexibly adjust the circumferential position of each blade assembly on the mounting ring to meet the blade distribution requirements of different flight missions.

[0020] 4. The limiting post on the deflection seat can mechanically limit the maximum unfolding angle of the folding arm. Combined with the push-pull action of the linkage mounting rod mechanism, it ensures accurate and reliable unfolding positioning of the folding arm and high consistency in unfolding state.

[0021] 5. The overall structure requires no additional electronic control or servo components. All blades can be folded or unfolded synchronously by manually rotating the rotating ring. The structure is compact, low in cost, and suitable for various specifications of multi-rotor drones. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a first-view structural schematic diagram of a locking and unfolding device for a folding propeller blade used in unmanned aerial vehicles.

[0024] Figure 2 This is a second-view structural schematic diagram of a locking and unfolding device for a folding propeller blade used in unmanned aerial vehicles.

[0025] Figure 3 This is a third-view structural diagram of a locking and unfolding device for a folding propeller blade used in unmanned aerial vehicles.

[0026] Figure 4This is a schematic diagram of the blade assembly in a locking and unfolding device for a folding propeller blade used in a drone.

[0027] Figure 5 for Figure 4 A magnified view of region A in the middle.

[0028] Figure 6 This is a cross-sectional view of the tensioning mechanism in a locking and unfolding device for a folding propeller blade used in a drone.

[0029] In the diagram: 1. Mounting ring; 2. Mounting ring groove; 3. Positioning arc groove; 4. Rotating ring mechanism; 401. Rotating ring; 402. Mounting threaded through hole; 403. First bolt; 5. Positioning block mechanism; 501. Positioning block; 502. Second bolt; 6. Folding arm mechanism; 601. Deflection seat; 602. Folding arm; 603. Mounting plate; 7. Drive motor; 8. Paddle mechanism; 801. Rotating shaft; 802. Mounting top plate; 803. Folding seat; 804. Paddle; 9. Locking block mechanism; 901. Vertical slide groove; 902. Locking block; 903. Compression spring; 904. Lateral slide groove; 9 05. Tensioning mechanism; 9051. Tension spring; 9052. First pull plate; 9053. Pull rod; 9054. Second pull plate; 906. Wedge-shaped locking rod; 907. Wedge-shaped slot; 10. Folding adjustment mechanism; 1001. First deflection seat; 1002. Displacement linkage rod; 1003. Second deflection seat; 1004. Inner mounting ring; 1005. Outer mounting ring; 1006. Third deflection seat; 1007. Displacement rod; 1008. Fourth deflection seat; 11. Linkage mounting rod mechanism; 1101. Displacement shaft; 1102. Linkage rod; 1103. Mounting sleeve; 1104. Third bolt. Detailed Implementation

[0030] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0031] It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0032] For examples, please refer to Figures 1-6A locking and unfolding device for a folding propeller blade used in a drone includes a mounting ring 1. The outer side of the mounting ring 1 has a mounting ring groove 2, and the inner side of the mounting ring 1 has a positioning arc groove 3. A rotating ring mechanism 4 is located at the bottom of the mounting ring 1. Several propeller assemblies are mounted on the mounting ring groove 2. Each propeller assembly includes a positioning block mechanism 5, a folding arm mechanism 6, a drive motor 7, a propeller mechanism 8, a locking block mechanism 9, a folding adjustment mechanism 10, and a linkage mounting rod mechanism 11. The positioning block mechanism 5 is located on the mounting ring groove 2, the folding arm mechanism 6 is located on the side of the positioning block mechanism 5, the drive motor 7 is located at the lower part of the folding arm mechanism 6, and the propeller mechanism 8 is located at the upper part of the folding arm mechanism 6. The output shaft of the drive motor 7 is connected to the propeller mechanism 8. The stop block mechanism 9 is located on the folding arm mechanism 6, the folding adjustment mechanism 10 is located between the locking block mechanism 9 and the blade mechanism 8, and the linkage mounting rod mechanism 11 is located between the rotating ring mechanism 4 and the locking block mechanism 9. The rotating ring mechanism 4 is used to install the linkage mounting rod mechanism 11 and adjust the state of the linkage mounting rod mechanism 11. The linkage mounting rod mechanism 11 is used to adjust the unfolded and folded state of the folding arm mechanism 6 and to adjust the position of the locking block mechanism 9. The drive motor 7 is used to drive the blade mechanism 8 to rotate. The locking block mechanism 9 is used to adjust the state of the folding adjustment mechanism 10 and to adjust the folding and unfolded state of the blade mechanism 8. The locking block mechanism 9 is used to lock the unfolded state of the blade mechanism 8.

[0033] The rotating ring mechanism 4 includes a rotating ring 401 that is rotatably connected to the bottom of the mounting ring 1. The rotating ring 401 has a plurality of mounting threaded through holes 402 arranged at equal angles along the circumference in the vertical direction. The mounting threaded through holes 402 are connected to the mounting ring 1. The mounting threaded through holes 402 are threadedly connected to the first bolt 403. The end of the first bolt 403 is in contact with the mounting ring 1.

[0034] Specifically, when the first bolt 403 is tightened, its end presses against the bottom surface of the mounting ring 1, locking the rotating ring 401 at the current angle.

[0035] The positioning block mechanism 5 includes a positioning block 501 disposed on the mounting ring groove 2. The positioning block 501 and the mounting ring 1 are slidably connected. A second bolt 502 is provided on the inner side of the mounting ring 1. The second bolt 502 passes through the positioning arc groove 3. The second bolt 502 and the positioning block 501 are threadedly connected.

[0036] Specifically, a second bolt 502 is inserted into the positioning arc groove 3 on the inner side of the mounting ring 1. After the screw of the second bolt 502 passes through the positioning arc groove 3, it is screwed into the threaded hole of the positioning block 501. When the second bolt 502 is tightened, its nut presses against the inner wall of the mounting ring 1, thus fixing the positioning block 501.

[0037] The folding arm mechanism 6 includes a deflection seat 601 fixed to the side of the positioning block 501. The deflection seat 601 is rotatably connected to the folding arm 602. The central axis of the deflection seat 601 is parallel to the axis of the mounting ring 1. A limiting post is provided on the deflection seat 601 on one side of the folding arm 602. The limiting post is located on the side of the deflection seat 601 away from the linkage mounting rod mechanism 11. The limiting post is used to limit the maximum unfolding angle of the folding arm 602. The end of the folding arm 602 away from the deflection seat 601 is fixedly connected to the mounting plate 603. The drive motor 7 is located at the bottom of the mounting plate 603.

[0038] The blade mechanism 8 includes a rotating shaft 801 rotatably connected to the mounting plate 603. The output shaft of the drive motor 7 is coaxially and fixedly connected to the rotating shaft 801. The top of the rotating shaft 801 is fixedly connected to the mounting plate 802. Two symmetrically arranged folding seats 803 are fixedly connected to the side of the mounting plate 802. The rotation axis of the folding seats 803 is horizontal. The folding seats 803 are rotatably connected to the blades 804.

[0039] The locking block mechanism 9 is located in the vertical slide groove 901 of the folding arm 602. A locking block 902 is provided on the vertical slide groove 901. A compression spring 903 is fixedly connected to the side of the locking block 902 away from the deflection seat 601. The end of the compression spring 903 away from the locking block 902 is fixedly connected to the folding arm 602. The compression spring 903 is located within the vertical slide groove 901. A lateral slide groove 904 is provided on the side of the folding arm 602, and the lateral slide groove 904 communicates with the vertical slide groove 901. The side of the locking block 902... A tensioning mechanism 905 is provided on one side. A wedge-shaped locking rod 906 is provided on the side of the tensioning mechanism 905 near the folding arm 602. The end of the wedge-shaped locking rod 906 near the folding arm 602 is wedge-shaped. Several wedge-shaped slots 907 are provided on the side of the folding arm 602 corresponding to the position of the wedge-shaped locking rod 906. The wedge-shaped locking rod 906 and the wedge-shaped slots 907 work together to enable the locking block 902 to move unidirectionally away from the deflection seat 601 when the tensioning mechanism 905 is adjusted without external tension. The tensioning mechanism 905 includes a tension spring 9051 fixed inside the locking block 902. The tension spring 9051 is located on the inner side of the locking block 902 away from the wedge-shaped lever 906. The end of the tension spring 9051 is fixedly connected to a first pull plate 9052, which is located inside the locking block 902. The first pull plate 9052 and the locking block 902 are slidably connected. The first pull plate 9052 is located inside the locking block 902. The side of the first pull plate 9052 away from the tension spring 9051 is fixedly connected to a pull rod 9053, which passes through the locking block 902 and is slidably connected to the locking block 902. The end of the pull rod 9053 away from the first pull plate 9052 is fixedly connected to a second pull plate 9054, which is fixedly connected to the wedge-shaped lever 906.

[0040] Specifically, under the tension of the tension spring 9051, the wedge-shaped end of the wedge-shaped lever 906 is engaged in one of the wedge-shaped slots 907, allowing the locking block 902 to slide unidirectionally away from the deflection seat 601, while preventing it from retracting in the opposite direction, thus forming a unidirectional self-locking mechanism.

[0041] The folding adjustment mechanism 10 includes a first deflection seat 1001 fixed to the upper surface of the locking block 902. The first deflection seat 1001 is rotatably connected to a displacement linkage rod 1002. The end of the displacement linkage rod 1002 away from the first deflection seat 1001 is rotatably connected to a second deflection seat 1003. The second deflection seat 1003 is fixedly connected to an inner mounting ring 1004. A rotating shaft 801 passes through the inner mounting ring 1004. The rotating shaft 801 and the inner mounting ring 1004 are slidably connected. The outer side of the inner mounting ring 1004 is rotatably connected to an outer mounting ring 1005. The side of the outer mounting ring 1005 is fixedly connected to two symmetrically arranged third deflection seats 1006. The third deflection seats 1006 are rotatably connected to a displacement rod 1007. The end of the displacement rod 1007 away from the third deflection seat 1006 is rotatably connected to a fourth deflection seat 1008. The fourth deflection seat 1008 is fixed to the bottom of the blade 804.

[0042] The linkage mounting rod mechanism 11 includes a displacement shaft 1101 located at the bottom of the locking block 902. The displacement shaft 1101 and the locking block 902 are rotatably connected. The displacement shaft 1101 is rotatably connected to the linkage rod 1102. One end of the linkage rod 1102 away from the displacement shaft 1101 is rotatably connected to the mounting sleeve 1103. The mounting sleeve 1103 passes through the linkage rod 1102. The mounting sleeve 1103 and the linkage rod 1102 are rotatably connected. A third bolt 1104 is provided on the mounting sleeve 1103. The outer diameter of the third bolt 1104 is the same as the inner diameter of the mounting threaded through hole 402. The third bolt 1104 is used to mount the mounting sleeve 1103 on the rotating ring 401.

[0043] The workflow of this invention is as follows:

[0044] I. Installation and Pre-adjustment Phase

[0045] Mounting ring 1 is fixed to the UAV fuselage with bolts. According to the flight mission's requirements for the propeller's circumferential layout, the second bolts 502 of each blade assembly are loosened sequentially. The positioning block 501 is slid along the mounting ring groove 2 to the target circumferential position. After adjustment, the second bolts 502 are tightened, and the positioning block 501 is pressed and fixed onto the mounting ring 1. The mounting sleeves 1103 at the lower end of each linkage mounting rod mechanism 11 are aligned with the corresponding mounting threaded through holes 402 on the rotating ring 401, and the third bolts 1104 are screwed in, so that the bottom end of the linkage rod 1102 is hinged to the rotating ring 401. Pre-adjustment is complete.

[0046] II. Blade Deployment and Locking Stage

[0047] Loosen the first bolt 403 to release the lock of the rotating ring 401. Rotate the rotating ring 401 in the unfolding direction. The rotating ring 401 drives each mounting sleeve 1103 to move synchronously. The linkage rod 1102 pushes the locking block 902 to slide away from the deflection seat 601 in the vertical slide groove 901, compressing the compression spring 903.

[0048] When the locking block 902 moves, one side of it engages with the deflector seat 601 via the linkage rod 1102, pushing the folding arm 602 to rotate outward around the deflector seat 601 until the folding arm 602 is against the limiting post, completing the unfolding and positioning of the folding arm 602. On the other side, the first deflector seat 1001 on the upper surface of the locking block 902 drives the displacement linkage rod 1002 to move. The displacement linkage rod 1002 pushes the inner mounting ring 1004 to slide upward along the rotation axis 801 via the second deflector seat 1003. The inner mounting ring 1004 drives the third deflector seat 1006 to move upward via the outer mounting ring 1005. Through the displacement rod 1007 and the fourth deflector seat 1008, the two blades 804 are pushed to rotate around the folding seat 803 and unfold to the horizontal working position.

[0049] During the sliding process of the locking block 902, the wedge-shaped locking rod 906 on the side of the tensioning mechanism 905 continuously passes over the wedge-shaped slots 907 on the side wall of the folding arm 602 with its wedge-shaped inclined surface. When the folding arm 602 and the blade 804 are fully extended, the rotating ring 401 stops rotating, and the wedge-shaped locking rod 906 automatically engages in the corresponding wedge-shaped slot 907 under the action of the tension spring 9051. The locking block 902 is locked in one direction and cannot retract towards the deflection seat 601. At this time, the folding adjustment mechanism 10 is reliably locked, and the blade 804 remains in the extended state. Tighten the first bolt 403, and the rotating ring 401 is locked to the mounting ring 1.

[0050] III. Flight Operation Phase

[0051] When the drive motor 7 is started, the output shaft drives the rotating shaft 801 to rotate. The rotating shaft 801 drives the mounting plate 802, its folding seat 803, and the propeller blade 804 to rotate together, generating lift. During flight, the locking block 902 is reliably fixed by the one-way self-locking engagement of the wedge-shaped lever 906 and the wedge-shaped slot 907, and the propeller blade 804 remains stably deployed without being affected by airflow disturbances or speed fluctuations.

[0052] IV. Paddle Folding and Storage Stage

[0053] After the flight is completed, loosen the first bolt 403 to release the lock on the rotating ring 401. Pull the second pull plate 9054 on each locking block mechanism 9 outward. The second pull plate 9054 stretches the tension spring 9051 through the pull rod 9053 and the first pull plate 9052, pulling the wedge-shaped locking rod 906 out of the wedge-shaped locking groove 907 and releasing the one-way self-locking constraint of the locking block 902.

[0054] Under the elastic restoring force of the compression spring 903, the locking block 902 slides and resets itself along the vertical slide groove 901 towards the deflection seat 601. As the locking block 902 slides down, the inner mounting ring 1004 slides downwards along the rotation axis 801 via the displacement linkage rod 1002. The outer mounting ring 1005 and the displacement rod 1007 then pull the two blades 804 downwards around the folding seat 803 and retract them. Simultaneously, the linkage rod 1102 drives the folding arm 602 to retract inwards, and the mounting sleeve 1103 pushes the rotating ring 401 to rotate in the opposite direction and reset itself. After the blades 804 and folding arm 602 are fully folded, the second pull plate 9054 is released, and the wedge-shaped locking rod 906, under the action of the tension spring 9051, re-engages itself in the wedge-shaped slot 907 near the deflection seat 601. The first bolt 403 is tightened, locking the rotating ring 401 and the mounting ring 1, completing the retraction process.

[0055] Through the above process, simply rotating the rotating ring 401 and pulling the second pull plate 9054 can achieve the synchronous folding and unfolding of all blades 804. The operation is convenient, the locking is reliable, and the efficiency of blade locking and unfolding is effectively improved.

[0056] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention 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 invention should be included within the protection scope of the present invention.

Claims

1. A locking and unfolding device for a folding propeller blade used in a drone, comprising a mounting ring, characterized in that, The mounting ring has a mounting ring groove on its outer side and a positioning arc groove on its inner side. A rotating ring mechanism is located at the bottom of the mounting ring. Several blade assemblies are mounted on the mounting ring groove. Each blade assembly includes a positioning block mechanism, a folding arm mechanism, a drive motor, a blade mechanism, a locking block mechanism, a folding adjustment mechanism, and a linkage mounting rod mechanism. The positioning block mechanism is located on the mounting ring groove, the folding arm mechanism is located on the side of the positioning block mechanism, the drive motor is located at the lower part of the folding arm mechanism, and the blade mechanism is located at the upper part of the folding arm mechanism. The output shaft of the drive motor is connected to the blade mechanism, and the locking block mechanism is located on the folding arm mechanism. The folding adjustment mechanism is located between the locking block mechanism and the blade mechanism, and the linkage mounting rod mechanism is located between the rotating ring mechanism and the locking block mechanism. The rotating ring mechanism is used to install the linkage mounting rod mechanism and adjust the state of the linkage mounting rod mechanism. The linkage mounting rod mechanism is used to adjust the unfolded and folded state of the folding arm mechanism and to adjust the position of the locking block mechanism. The drive motor is used to drive the blade mechanism to rotate. The locking block mechanism is used to adjust the state of the folding adjustment mechanism and to adjust the folding and unfolded state of the blade mechanism. The locking block mechanism is used to lock the unfolded state of the blade mechanism.

2. The locking and unfolding device for folding propeller blades for unmanned aerial vehicles according to claim 1, characterized in that, The rotating ring mechanism includes a rotating ring rotatably connected to the bottom of the mounting ring. The rotating ring has several mounting threaded through holes arranged at equal angles along the circumference in the vertical direction. The mounting threaded through holes are connected to the mounting ring. The mounting threaded through holes are threadedly connected to a first bolt. The end of the first bolt contacts the mounting ring.

3. The locking and unfolding device for folding propeller blades for unmanned aerial vehicles according to claim 2, characterized in that, The positioning block mechanism includes a positioning block disposed on the mounting ring groove, the positioning block and the mounting ring being slidably connected, a second bolt being disposed on the inner side of the mounting ring, the second bolt passing through the positioning arc groove, and the second bolt being threadedly connected to the positioning block.

4. The locking and unfolding device for folding propeller blades for unmanned aerial vehicles according to claim 3, characterized in that, The folding arm mechanism includes a deflection seat fixed to the side of the positioning block. The deflection seat is rotatably connected to the folding arm. The central axis of the deflection seat is parallel to the axis of the mounting ring. A limiting post is provided on one side of the folding arm on the deflection seat. The limiting post is located on the side of the deflection seat away from the linkage mounting rod mechanism. The limiting post is used to limit the maximum unfolding angle of the folding arm. The end of the folding arm away from the deflection seat is fixedly connected to the mounting plate. The drive motor is located at the bottom of the mounting plate.

5. The locking and unfolding device for folding propeller blades for unmanned aerial vehicles according to claim 4, characterized in that, The blade mechanism includes a rotating shaft rotatably connected to the mounting plate, an output shaft of a drive motor and a rotating shaft coaxially and fixedly connected, a mounting plate fixedly connected to the top of the rotating shaft, and two symmetrically arranged folding seats fixedly connected to the sides of the mounting plate. The rotation axis of the folding seats is horizontal, and the folding seats are rotatably connected to the blades.

6. The locking and unfolding device for folding propeller blades for unmanned aerial vehicles according to claim 5, characterized in that, The locking block mechanism is located in the vertical slide groove of the folding arm. A locking block is provided on the vertical slide groove. A compression spring is fixedly connected to the side of the locking block away from the deflection seat. The end of the compression spring away from the locking block is fixedly connected to the folding arm. The compression spring is located in the vertical slide groove. A lateral slide groove is provided on the side of the folding arm. The lateral slide groove and the vertical slide groove are connected. A tensioning mechanism is provided on the side of the locking block. A wedge-shaped locking rod is provided on the side of the tensioning mechanism near the folding arm. The end of the wedge-shaped locking rod near the folding arm is a wedge-shaped structure. Several wedge-shaped slots are provided on the side of the folding arm corresponding to the position of the wedge-shaped locking rod. The wedge-shaped locking rod and the wedge-shaped slots cooperate to enable the locking block to move unidirectionally to the end away from the deflection seat when the tensioning mechanism is adjusted without external tension.

7. The locking and unfolding device for folding propeller blades for unmanned aerial vehicles according to claim 6, characterized in that, The tensioning mechanism includes a tension spring fixed inside the locking block. The tension spring is located on the side of the locking block away from the wedge-shaped lever. The end of the tension spring is fixedly connected to a first pull plate, which is located inside the locking block and is slidably connected to the locking block. The side of the first pull plate away from the tension spring is fixedly connected to a pull rod, which passes through the locking block and is slidably connected to the locking block. The end of the pull rod away from the first pull plate is fixedly connected to a second pull plate, which is fixedly connected to the wedge-shaped lever.

8. The locking and unfolding device for folding propeller blades for unmanned aerial vehicles according to claim 6, characterized in that, The folding adjustment mechanism includes a first deflector fixed to the upper surface of the locking block, the first deflector rotatably connected to a displacement linkage rod, the end of the displacement linkage rod away from the first deflector rotatably connected to a second deflector, the second deflector fixedly connected to an inner mounting ring, a rotating shaft passing through the inner mounting ring, the rotating shaft and the inner mounting ring being slidably connected, the outer side of the inner mounting ring being rotatably connected to an outer mounting ring, the side of the outer mounting ring being fixedly connected to two symmetrically arranged third deflectors, the third deflectors rotatably connected to a displacement rod, the end of the displacement rod away from the third deflector rotatably connected to a fourth deflector, and the fourth deflector fixed to the bottom of the blade.

9. The locking and unfolding device for folding propeller blades for unmanned aerial vehicles according to claim 6, characterized in that, The linkage mounting rod mechanism includes a displacement shaft located at the bottom of the locking block, the displacement shaft and the locking block being rotatably connected, the displacement shaft being rotatably connected to a linkage rod, and the end of the linkage rod away from the displacement shaft being rotatably connected to a mounting sleeve, the mounting sleeve passing through the linkage rod, the mounting sleeve and the linkage rod being rotatably connected, and a third bolt being provided on the mounting sleeve, the outer diameter of the third bolt being the same as the inner diameter of the mounting thread through hole, the third bolt being used to mount the mounting sleeve on the rotating ring.

Images