Paddle structure and unmanned aerial vehicle

Abstract

The embodiment of the utility model relates to the technical field of unmanned aerial vehicles, and particularly discloses a paddle structure and an unmanned aerial vehicle. The paddle assembly comprises two paddles, and each paddle is provided with a root part and an end part which are oppositely arranged; the paddle clamp seat comprises an upper paddle clamp, a lower paddle clamp and a limiting assembly, a clamping area used for clamping the paddles is formed between the upper paddle clamp and the lower paddle clamp, the root parts are arranged in the clamping area and rotationally connected to the paddle clamp seat, the two paddles are arranged at intervals in the circumferential direction of the paddle clamp seat, and a central area is formed among the upper paddle clamp, the lower paddle clamp and the two root parts; the limiting assembly is arranged in the central area, the limiting assembly is arranged on one of the upper paddle clamp and the lower paddle clamp, the limiting assembly comprises a limiting structure and a damping part, and the damping part is arranged on the limiting structure; the limiting structure is used for limiting the stroke of reciprocating rotation of the paddle, and the damping piece is used for absorbing impact generated when the paddle collides with the limiting structure. According to the embodiment of the utility model, the damage can be reduced.

Description

Technical Field

[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) technology, and in particular to a propeller structure and a UAV. Background Technology

[0002] The propeller structure, as a key component of a drone, is used to provide lift by rotating. The propeller structure includes blades and a propeller holder. The blades are mounted on the propeller holder, and the drone's drive unit rotates the propeller holder, thereby forcing the blades to rotate.

[0003] In the process of realizing this utility model, the inventors discovered that in the current blade structure, the type in which the blade is rotatably connected to the blade holder is very common, that is, the blade can rotate relative to the blade holder, and the relative movement between the blade and the blade holder can easily cause damage. Utility Model Content

[0004] This utility model provides a propeller structure and a drone that can reduce damage.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: 1. A blade structure, comprising a blade assembly and a blade holder; the blade assembly comprises two blades, each blade having a root and an end portion disposed opposite to each other; the blade holder comprises an upper blade holder, a lower blade holder, and a limiting component, the upper and lower blade holders being disposed opposite to each other, forming a clamping area for clamping the blades between the upper and lower blade holders, the root portion being disposed in the clamping area, the end portion of the blade extending out of the clamping area, the root portion being rotatably connected to the blade holder, the two blades being spaced apart circumferentially along the blade holder, a central area being formed between the upper and lower blade holders and the two roots, the limiting component being disposed in the central area, the limiting component being disposed in one of the upper and lower blade holders, the limiting component comprising a limiting structure and a shock absorber, the shock absorber being disposed in the limiting structure; wherein, the limiting structure is used to limit the reciprocating rotation stroke of the blades, and the shock absorber is used to absorb the impact generated when the blades collide with the limiting structure.

[0006] Optionally, the limiting structure is provided with a first limiting part, a second limiting part, and a first clearance part on the side facing the root. The first clearance part is formed by the limiting structure being recessed inward on the side facing the root. The first limiting part and the second limiting part are respectively located on both sides of the first clearance part. The shock absorber covers at least the first limiting part and the second limiting part so that when the first limiting part or the second limiting part restricts the movement of the blade, the blade abuts against the shock absorber.

[0007] Optionally, the damping component includes a first damping part and a second damping part. The shape of the first damping part matches the shape of the first limiting part and completely covers the first limiting part. The shape of the second damping part matches the shape of the second limiting part and completely covers the second limiting part. A first abutting part and a second abutting part are provided at the root. The shape of the first abutting part matches the shape of the first damping part and the shape of the second abutting part matches the shape of the second damping part. When the first limiting part restricts the movement of the blade, the first abutting part is attached to the first damping part. When the second limiting part abuts against the second damping part, the second abutting part is attached to the second damping part.

[0008] Optionally, an arc-shaped portion is provided on the side of the root facing the limiting structure, and the central axis of the arc-shaped portion coincides with the rotation center of the blade; the first clearance portion is an arc surface that matches the arc-shaped portion, and the central axis of the first clearance portion coincides with the central axis of the arc-shaped portion, and a gap is provided between the first clearance portion and the arc-shaped portion.

[0009] Optionally, the propeller holder also includes fasteners, which are connected to the upper propeller clamp and the lower propeller clamp respectively, so that the upper propeller clamp and the lower propeller clamp are both subjected to a fastening force pointing towards the clamping area, and the fasteners are inserted through the central area.

[0010] Optionally, multiple fasteners are provided at circumferential intervals along the paddle clamp seat.

[0011] Optionally, the upper propeller clamp and / or lower propeller clamp are provided with reinforcing ribs, which extend from the position corresponding to the central area to the positions corresponding to the two roots, respectively.

[0012] Optionally, the blade structure may also include a gasket assembly, with a gasket assembly disposed between the root and the upper blade clamp, and / or, with a gasket assembly disposed between the root and the lower blade clamp.

[0013] Optionally, the gasket assembly includes a friction-reducing gasket and a vibration-damping gasket. The friction-reducing gasket is used to reduce the friction force on the blade, and the vibration-damping gasket is used to absorb the vibration generated when the blade is working. The friction-reducing gasket is fitted to the blade, and the vibration-damping gasket is located on the side of the friction-reducing gasket away from the blade.

[0014] To solve the above-mentioned technical problems, another technical solution adopted by this utility model is to provide a drone, including the propeller structure as described in any of the above embodiments.

[0015] The beneficial effects of this utility model embodiment are as follows: Unlike the prior art, this utility model embodiment provides a blade structure, including a blade assembly and a blade holder. The blade assembly includes two blades, each having a root and an end portion disposed opposite to each other. The blade holder includes an upper blade holder, a lower blade holder, and a limiting component. The upper and lower blade holders are disposed opposite to each other, forming a clamping area between them for clamping the blades. The root portion is disposed in the clamping area, and the end portion of the blade extends out of the clamping area. The root portion is rotatably connected to the blade holder. The two blades are spaced apart circumferentially along the blade holder. A central area is formed between the upper and lower blade holders and the two roots. The limiting component is disposed in the central area, specifically in one of the upper and lower blade holders. The limiting component includes a limiting structure and a shock absorber, with the shock absorber disposed in the limiting structure. The limiting structure restricts the reciprocating rotation stroke of the blades, and the shock absorber absorbs the impact generated when the blades collide with the limiting structure. Thus, when the blades are folded, even if excessive force causes the blades to collide with the limiting components, or if a malfunction in the blade structure causes the blades to collide with the limiting components during operation, the shock absorbers can absorb the impact of the collision, thereby reducing damage. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the drawings without creative effort.

[0017] Figure 1 This is a perspective view of the drone according to an embodiment of the present utility model;

[0018] Figure 2 This is an exploded view of the drone according to an embodiment of the present invention;

[0019] Figure 3 This is a perspective view of the blade of an embodiment of the present utility model;

[0020] Figure 4 This is a perspective view of the upper paddle clamp according to an embodiment of the present utility model;

[0021] Figure 5 This is a schematic diagram of the limiting structure and the lower paddle clamp integrally formed according to an embodiment of the present utility model;

[0022] Figure 6 This is a perspective view of the shock absorber according to an embodiment of the present utility model;

[0023] Figure 7 This is a perspective view of the rotating shaft according to an embodiment of the present utility model;

[0024] Figure 8This is a perspective view of the driving device according to an embodiment of the present utility model.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1000. Blade structure;

[0027] 1. Blade assembly; 11. Blade; 111. Root; 1111. First abutment portion; 1112. Arc portion; 1113. First connecting hole;

[0028] 2. Propeller clamp holder; 21. Upper propeller clamp; 211. Reinforcing rib; 212. Second connecting hole; 213. Third connecting hole; 22. Lower propeller clamp; 221. Fourth connecting hole; 222. First countersunk hole; 223. Positioning hole; 23. Limiting component; 231. Limiting structure; 2311. First limiting part; 2312. Second limiting part; 2313. First clearance part; 2314. Fifth connecting hole; 2315. First screw hole; 232. Shock absorber; 2321. First shock absorber; 2322. Second shock absorber; 2323. Second clearance part; 2324. Sixth connecting hole; 2325. Seventh connecting hole; 24. Fastener; 25. Rotating shaft; 251. Cylindrical part; 252. Base; 2521. First limiting surface; 253. Second screw hole; 26. First screw connector;

[0029] 3. Gasket assembly; 31. Friction-reducing gasket; 311. Eighth connecting hole; 32. Vibration-damping gasket; 321. Ninth connecting hole;

[0030] 4. Second screw connector;

[0031] 2000, Drive unit;

[0032] 5. Positioning pin; 6. Third screw hole. Detailed Implementation

[0033] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0034] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0035] Please see Figure 1 and Figure 2 The blade structure 1000 includes a blade assembly 1 and a blade holder 2. The blade assembly 1 is disposed on the blade holder 2. When the blade holder 2 rotates, it drives the blade assembly 1 to rotate, so that the blade assembly 1 provides lift.

[0036] For the blade assembly 1 described above, please refer to... Figure 2 and Figure 3 The blade assembly 1 includes two blades 11, each blade 11 having a root 111 and an end (not shown), located at opposite ends of the blade 11. The root 111 is used to connect with the blade holder 2, and the end is located at the end furthest from the blade holder 2. The root 111 has a first connecting hole 1113, which is a circular hole extending through the blade 11 along the thickness direction of the root 111. It is understood that the rotation axis of the blade 11 coincides with the central axis of the first connecting hole 1113, meaning that the blade 11 rotates around the central axis of the first connecting hole 1113 when it rotates.

[0037] The root portion 111 described above has two clamping surfaces, which are planar and are arranged opposite each other along the thickness direction of the root portion 111. The two clamping surfaces abut against the propeller clamp seat 2, so that the root portion 111 is clamped and fixed to the propeller clamp seat 2.

[0038] The root portion 111 is further provided with a first abutting portion 1111, a second abutting portion (not shown), and an arc-shaped portion 1112. The first abutting portion 1111, the second abutting portion, and the arc-shaped portion 1112 are all located between two clamping surfaces, that is, the first abutting portion 1111, the second abutting portion, and the arc-shaped portion 1112 are all located on the side of the root portion 111. The arc-shaped portion 1112 is an arc surface, and its central axis coincides with the central axis of the first connecting hole 1113, so that the movement trajectory of the arc-shaped portion 1112 coincides with its contour, thereby reducing the installation space required for the root portion 111 and making the structure compact. The first abutting portion 1111 and the second abutting portion are respectively connected to both sides of the arc-shaped portion 1112.

[0039] For the propeller clamp 2 mentioned above, please refer to... Figure 2 and combined Figures 4-7The propeller holder 2 includes an upper propeller clamp 21, a lower propeller clamp 22, and a limiting structure 231. The upper propeller clamp 21 and the lower propeller clamp 22 are arranged opposite each other along the thickness direction of the root portion 111, forming a clamping area between them. The root portion 111 is located in the clamping area and rotatably connected to the propeller holder 2, allowing the propeller blade 11 to reciprocate. The two root portions 111 are evenly spaced circumferentially about the propeller holder 2. The clamping area includes a central area, which is enclosed by the two root portions 111, the upper propeller clamp 21, and the lower propeller clamp 22. The limiting component 23 is located in the central area and fixed to the lower propeller clamp 22. The limiting component 23 restricts the reciprocating stroke of the propeller blade 11, reducing the risk of the propeller blade 11 colliding with another propeller blade 11 or other components in the propeller holder 2 besides the limiting component 23, thereby minimizing damage. Understandably, the blade 11 can rotate relative to the blade holder 2, thus enabling the blade 2 to fold. In the non-operating state, applying external force to the blade 11 and rotating it to a suitable position completes the folding of the blade 11, thereby reducing the space occupied by the blade structure 1000. When folding the blade 11, the operator may use excessive force and cause the blade 11 to impact the limiting component 23. Alternatively, the blade structure 1000 may also impact the limiting component 23 during operation due to a malfunction. In this case, the limiting structure 231 can absorb the impact generated by the collision with the blade 11, thereby reducing damage to the limiting component 23 and the blade 11.

[0040] In some embodiments, the setting method of the limiting component 23 is not limited to this. The limiting structure 231 can also be set on the upper propeller clamp 21, as long as the limiting component 23 can be fixed to the propeller clamp seat 2, the limiting component 23 can limit the stroke of the reciprocating rotation of the propeller blade 11, and the limiting component 23 can absorb the impact generated when it is hit by the propeller blade 11.

[0041] The upper propeller clamp 21 described above is provided with reinforcing ribs 211. The reinforcing ribs 211 extend from the position corresponding to the central region to the positions corresponding to the two root portions 111. During operation, the root portions 111 often warp; the reinforcing ribs 211 increase the strength of the upper propeller clamp 21 and reduce the risk of deformation of the propeller clamp seat 2. In some other embodiments, the reinforcing ribs 211 can also be provided on the lower propeller clamp 22, or both the upper propeller clamp 21 and the lower propeller clamp 22 may have reinforcing ribs 211.

[0042] The aforementioned limiting component 23 includes a limiting structure 231 and a shock absorber 232. The limiting structure 231 limits the stroke of the reciprocating rotation of the blade 11. The shock absorber 232 can be made of rubber and is disposed on the limiting structure 231 to absorb the impact generated when the blade 11 collides with the limiting structure 231, thereby reducing damage. The limiting structure 231 is disposed in the central region and is integrally formed with the lower blade clamp 22. Optionally, the fixing method of the limiting structure 231 is not limited to this; the limiting structure 231 and the lower blade clamp 22 can be independent components assembled together, as long as the limiting structure 231 can be fixed to the lower blade clamp 22.

[0043] The limiting structure 231 described above is provided with a first clearance portion 2313. The first clearance portion 2313 is formed by an inward recess from the side of the limiting structure 231 toward the root portion 111. The first clearance portion 2313 is used to avoid the root portion 111, reducing the risk of interference between the root portion 111 and the limiting component 23. At least a portion of the root portion 111 is disposed within the first clearance portion 2313 to make the blade structure 1000 compact.

[0044] Furthermore, the first clearance portion 2313 is an arc surface that matches the arc portion 1112, and the central axis of the first clearance portion 2313 coincides with the central axis of the arc portion 1112. At least a portion of the arc portion 1112 is located within the first clearance portion 2313. In this way, the contour of the first clearance portion 2313 coincides with the movement trajectory of the arc portion 1112, thereby reducing the size of the first clearance portion 2313 and making the structure compact.

[0045] Furthermore, the limiting structure 231 is also provided with a first limiting part 2311 and a second limiting part 2312, both of which are located on the side of the limiting structure 231 facing the root portion 111. The first limiting part 2311 and the second limiting part 2312 are respectively connected to both sides of the first clearance portion 2313. The first limiting part 2311 and the second limiting part 2312 are respectively used to restrict the rotation of the blade 11 in two opposite directions. When the first abutting portion 1111 abuts against the first limiting part 2311, the first limiting part 2311 restricts the rotation of the blade 11 in one direction. When the second abutting portion abuts against the second limiting part 2312, the second limiting part 2312 restricts the rotation of the blade 11 in the other direction.

[0046] Optionally, when the limiting structure 231 restricts the rotation of the blade 11, the length direction of the blade 11 is perpendicular to the line connecting the two roots 111, that is, the direction in which the root 111 of the blade 11 points to the end is perpendicular to the direction in which one root 111 points to the other root 111.

[0047] The aforementioned damping member 232 is sleeved on the limiting structure 231. When the limiting structure 231 restricts the rotation of the blade 11, the blade 11 abuts against the damping member 232. The damping member 232 includes a first damping portion 2321 and a second damping portion 2322. The shape of the first damping portion 2321 matches the shape of the first limiting portion 2311, and the first damping portion 2321 completely covers the first limiting portion 2311. The shape of the second damping portion 2322 matches the shape of the second limiting portion 2312. The root portion 111 is provided with a first abutting portion 1111 and a second abutting portion. The shape of the first abutting portion 1111 matches the shape of the first damping portion 2321, and the shape of the second abutting portion matches the shape of the second damping portion 2322. When the first limiting part 2311 restricts the movement of the blade 11, the first abutting part 1111 abuts against the first damping part 2321. When the second limiting part 2312 abuts against the second damping part 2322, the second abutting part abuts against the second damping part 2322. This ensures the area of ​​the first damping part 2321 and the second damping part 2322, as well as the contact area between the first abutting part 1111 and the first damping part 2321, and the contact area between the second abutting part and the second damping part 2322, thereby guaranteeing the damping effect. Simultaneously, it fully utilizes the space within the clamping area, resulting in a compact structure. Optionally, both the first abutting part 1111 and the second abutting part are planar, further improving the structural compactness.

[0048] The damper 232 also includes a second clearance portion 2323, which is formed by an inward recess of the damper 232 toward the root portion 111, and covers the first clearance portion 2313. The second clearance portion 2323 is used to avoid the root portion 111, reducing the risk of interference between the root portion 111 and the damper 232. At least a portion of the root portion 111 is disposed within the second clearance portion 2323 to make the blade structure 1000 compact. Furthermore, the second clearance portion 2323 is an arc surface that matches the arc portion 1112, the central axis of the second clearance portion 2323 coincides with the central axis of the arc portion 1112, and at least a portion of the arc portion 1112 is located within the second clearance portion 2323. In this way, while ensuring a compact structure, the risk of friction between the blade 11 and the limiting assembly 23 is reduced. A gap is provided between the arc portion 1112 and the second clearance portion 2323 to further reduce the risk of friction between the blade 11 and the limiting component 23. Optionally, the distance between the arc portion 1112 and the second clearance portion 2323 is 0.5mm-1mm.

[0049] It is understandable that the second clearance portion 2323 may not be provided, and a gap may be provided between the arc portion 1112 and the first clearance portion 2313. Optionally, the distance between the arc portion 1112 and the first clearance portion 2313 is 0.5mm-1mm.

[0050] In some embodiments, two limiting structures 231 may be provided, and the two limiting structures 231 are respectively used to limit the reciprocating stroke of a blade 11. Two damping members 232 may be provided, with one damping member 232 sleeved on a limiting structure 231. The damping member 232 is provided with a first damping part 2321, a second damping part 2322, and a second clearance part 2323. The first damping part 2321 covers the first limiting part 2311, the second damping part 2322 covers the second limiting part 2312, and the second clearance part 2323 covers the first clearance part 2313. Alternatively, only one shock absorber 232 may be provided. The shock absorber 232 is simultaneously fitted onto two limiting structures 231. The shock absorber 232 is provided with two first shock absorber parts 2321, two second shock absorber parts 2322 and two second clearance parts 2323. The shock absorber 232 is simultaneously fitted onto two limiting structures 231. One first shock absorber part 2321 covers one first limiting part 2311, one second shock absorber part 2322 covers one second limiting part 2312, and one second clearance part 2323 covers one first clearance part 2313.

[0051] In some embodiments, only one limiting structure 231 may be provided, which is used to limit the reciprocating stroke of the two blades 11. The limiting structure 231 is provided with a first limiting part 2311, a second limiting part 2312 and a first clearance part 2313 on both sides facing the two roots 111.

[0052] The propeller holder 2 also includes fasteners 24, which are respectively connected to the upper propeller clamp 21 and the lower propeller clamp 22, so that both the upper propeller clamp 21 and the lower propeller clamp 22 are subjected to a fastening force pointing towards the clamping area. The fasteners 24 pass through the central area. In this way, the warping of the upper propeller clamp 21 and the lower propeller clamp 22 in the direction away from the central area is reduced, the strength of the propeller holder 2 is improved, and the damage caused by the warping of the propeller blade 11 during operation is reduced.

[0053] In some embodiments, the fastener 24 is a bolt. The upper propeller clamp 21 is provided with a second connecting hole 212, which is a strip-shaped hole. The direction of the first connecting hole 1113 is parallel to the direction from one root 111 to another root 111. The strip-shaped hole increases the hollow area and reduces the mass of the upper propeller clamp 21. There are two fasteners 24. The shock absorber 232 is provided with two sixth connecting holes 2324, and the limiting structure 231 is provided with two first screw holes 2315. One fastener 24 is sequentially inserted through the second connecting hole 212 and one sixth connecting hole 2324 and then screwed into one first screw hole 2315. The two fasteners 24 are symmetrically arranged about the rotation axis of the propeller clamp seat 2 to make the force distribution of the propeller clamp seat 2 reasonable, thereby reducing the risk of damage. Optionally, there may also be two second connecting holes 212, and one fastener 24 is inserted through one second connecting hole 212. It is understood that the number of fasteners 24 is not limited to two, and may also be one, three, etc.

[0054] It should be noted that the fastener 24 is not limited to bolts, as long as it can ensure that both the upper propeller clamp 21 and the lower propeller clamp 22 are subjected to a fastening force pointing towards the clamping area.

[0055] In some embodiments, the blade structure 1000 further includes two gasket assemblies 3. One gasket assembly 3 is provided between the root 111 and the upper blade clamp 21, and the other between the root 111 and the lower blade clamp 22. The gasket assemblies 3 reduce the frictional force on the blade 11, thereby reducing wear. Optionally, one of the gasket assemblies 3 may be provided between the root 111 and the upper blade clamp 21, or between the root 111 and the lower blade clamp 22. The gasket assembly 3 includes a friction-reducing gasket 31 and a vibration-damping gasket 32. The friction-reducing gasket 31 reduces the frictional force on the blade 11, and the vibration-damping gasket 32 ​​absorbs the vibrations generated during blade 11 operation. The friction-reducing gasket 31 is fitted to the blade 11, and the vibration-damping gasket 32 ​​is located on the side of the friction-reducing gasket 31 facing away from the blade 11. Optionally, the friction-reducing gasket 31 is a metal gasket, and the vibration-damping gasket 32 ​​is a plastic gasket.

[0056] The lower propeller clamp 22 described above has two first countersunk holes 222. The first countersunk holes 222 are located on the side of the lower propeller clamp 22 closest to the clamping area, and their shapes match the travel of the damping pad 32. A damping pad 32 is inserted into one of the first countersunk holes 222, with a portion of the pad 32 located within the first countersunk hole 222 and the other portion protruding from it. In this way, the first countersunk holes 222 restrict the movement of the damping pad 32, ensuring its normal operation. It is understood that the upper propeller clamp 21 can also have a third countersunk hole, and the arrangement of the third countersunk hole is similar to that of the first countersunk hole 222, which will not be elaborated upon here.

[0057] In some embodiments, the propeller clamp 2 further includes two first screw-in members 26 and two rotating shafts 25. Each rotating shaft 25 includes a cylindrical portion 251 and a base 252. The diameter of the cylindrical portion 251 is the same as the diameter of the first connecting hole 1113. The base 252 is disposed at one end of the cylindrical portion 251, and the other end of the cylindrical portion 251 is provided with a second screw hole 253. The base 252 also has a first limiting surface 2521. The lower propeller clamp 22 also has two fourth connecting holes 221 and two second countersunk holes. The fourth connecting holes 221 penetrate the lower propeller clamp 22 along its thickness direction, and the second countersunk holes are disposed on the side of the lower propeller clamp 22 away from the clamping area. The central axes of the first countersunk holes 222, the second countersunk holes, and the fourth connecting holes 221 coincide. Along the thickness direction of the lower propeller clamp 22, the projection area of ​​the fourth connecting holes 221 is located within the projection area of ​​the first countersunk holes 222, and the projection area of ​​the fourth connecting holes 221 is located within the projection area of ​​the second countersunk holes. The friction-reducing pad 31 is provided with an eighth connecting hole 311, and the shock-absorbing pad 32 is provided with a ninth connecting hole 321. The upper paddle clamp 21 is provided with a third connecting hole 213. The base 252 is inserted into the second countersunk hole, and the cylindrical part 251 is sequentially inserted into a fourth connecting hole 221, a ninth connecting hole 321, an eighth connecting hole 311, a first connecting hole 1113, an eighth connecting hole 311, a ninth connecting hole 321, and a third connecting hole 213. A first screw connector 26 is inserted into a second screw hole 253.

[0058] Furthermore, the lower propeller clamp 22 has a second limiting surface on the side wall of the second countersunk hole. The cylindrical portion 251 is inserted into the fourth connecting hole 221, and the base 252 is inserted into the second countersunk hole. The first limiting surface 2521 cooperates with the second limiting surface to restrict the relative rotation between the rotating shaft 25 and the lower propeller clamp 22 and the base 252. In this way, the risk of the first screw connector 26 falling off the rotating shaft 25 is reduced.

[0059] In this embodiment of the invention, the blade structure 1000 includes a blade assembly 1 and a blade holder 2. The blade assembly 1 includes two blades 11, each blade 11 having a root 111 and an end portion disposed opposite to each other. The propeller holder 2 includes an upper propeller clamp 21, a lower propeller clamp 22, and a limiting component 23. The upper and lower propeller clamps 21 and 22 are arranged opposite to each other, forming a clamping area for clamping the propeller blade 11. A root portion 111 is disposed in the clamping area, and the end of the propeller blade 11 extends out of the clamping area. The root portion 111 is rotatably connected to the propeller holder 2. Two propeller blades 11 are spaced apart circumferentially along the propeller holder 2. A central area is formed between the upper and lower propeller clamps 21 and 22 and the two root portions 111. The limiting component 23 is disposed in the central area and is disposed in one of the upper and lower propeller clamps 21 and 22. The limiting component 23 includes a limiting structure 231 and a shock absorber 232. The shock absorber 232 is disposed in the limiting structure 231. The limiting structure 231 is used to limit the reciprocating rotation stroke of the propeller blade 11, and the shock absorber 232 is used to absorb the impact generated when the propeller blade 11 collides with the limiting structure 231. Thus, when the blade 11 is folded, even if the blade 11 collides with the limiting component 23 due to excessive force, or if the blade structure 1000 malfunctions during operation and causes the blade 11 to collide with the limiting component 23, the shock absorber 232 can absorb the impact generated by the collision, thereby reducing damage.

[0060] This utility model provides embodiments of drones; please refer to [link / reference]. Figure 1 and Figure 2 The drone includes a drive unit 2000 and the aforementioned propeller structure 1000. The structure and function of the propeller structure 1000 can be found in the above embodiments, and will not be described in detail here.

[0061] For the aforementioned drive unit 2000, please refer to... Figure 1 and Figure 2 and combined Figure 8 The drive unit 2000 has a rotatable drive section on the side facing the blade structure 1000. The drive section has a positioning post 5 and multiple third screw holes 6. The central axis of the positioning post 5 coincides with the rotation axis of the blade structure 1000. The lower blade clamp 22 has a positioning hole 223 with the same diameter as the positioning post 5. The positioning post 5 is inserted into the positioning hole 223, thus restricting the relative movement of the blade structure 1000 and the drive unit 2000 along the radial direction of the positioning post 5.

[0062] The propeller holder 2 also includes multiple second screw-in components 4, the shock absorber 232 is provided with multiple seventh connecting holes 2325, and the limiting structure 231 is provided with multiple fifth connecting holes 2314. A second screw-in component 4 is sequentially passed through a seventh connecting hole 2325 and a fifth connecting hole 2314 and then screwed into a third screw hole 6. In this way, the propeller holder 2 is fixed to the drive unit, so that the drive unit drives the propeller holder 2 to rotate.

[0063] It should be noted that while the preferred embodiments of this utility model are provided in the specification and accompanying drawings, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this utility model; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this utility model specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A blade structure, characterized in that, include: A blade assembly includes two blades having a root and an end portion disposed opposite to each other; A propeller holder includes an upper propeller clamp, a lower propeller clamp, and a limiting assembly. The upper and lower propeller clamps are arranged opposite to each other, forming a clamping area between them for clamping the propeller blade. The root of the propeller blade is disposed in the clamping area, and the end of the propeller blade extends out of the clamping area. The root is rotatably connected to the propeller holder. Two propeller blades are spaced apart circumferentially along the propeller holder. A central area is formed between the upper and lower propeller clamps and the two roots. The limiting assembly is disposed in the central area and is disposed in one of the upper and lower propeller clamps. The limiting assembly includes a limiting structure and a shock absorber, with the shock absorber disposed in the limiting structure. The limiting structure is used to limit the reciprocating rotation stroke of the blade, and the shock absorber is used to absorb the impact generated when the blade collides with the limiting structure.

2. The blade structure according to claim 1, characterized in that, The limiting structure is provided with a first limiting part, a second limiting part and a first clearance part on the side facing the root. The first clearance part is formed by the limiting structure being recessed inward on the side facing the root. The first limiting part and the second limiting part are respectively located on both sides of the first clearance part. The shock absorber covers at least the first limiting portion and the second limiting portion, so that when the first limiting portion or the second limiting portion restricts the movement of the blade, the blade abuts against the shock absorber.

3. The blade structure according to claim 2, characterized in that, The shock absorber includes a first shock absorber and a second shock absorber. The shape of the first shock absorber matches the shape of the first limiting part, and the first shock absorber completely covers the first limiting part. The shape of the second shock absorber matches the shape of the second limiting part, and the second shock absorber completely covers the second limiting part. The root portion is provided with a first abutting portion and a second abutting portion, the shape of the first abutting portion matching the shape of the first shock-absorbing portion, and the shape of the second abutting portion matching the shape of the second shock-absorbing portion; When the first limiting part restricts the movement of the blade, the first abutting part is attached to the first damping part, and when the second limiting part abuts against the second damping part, the second abutting part is attached to the second damping part.

4. The blade structure according to claim 2, characterized in that, The root portion is provided with an arc portion on the side facing the limiting structure, and the central axis of the arc portion coincides with the rotation center of the blade. The first clearance portion is an arc surface that matches the arc portion, the central axis of the first clearance portion coincides with the central axis of the arc portion, and a gap is provided between the first clearance portion and the arc portion.

5. The blade structure according to claim 1, characterized in that, The propeller clamp also includes fasteners, which are respectively connected to the upper propeller clamp and the lower propeller clamp, so that both the upper propeller clamp and the lower propeller clamp are subjected to a fastening force pointing towards the clamping area, and the fasteners are inserted through the central area.

6. The blade structure according to claim 5, characterized in that, The fasteners are arranged in multiple circumferentially along the paddle clamp seat.

7. The blade structure according to any one of claims 1-6, characterized in that, The upper propeller clamp and / or the lower propeller clamp are provided with reinforcing ribs, which extend from the position corresponding to the central region to the positions corresponding to the two roots, respectively.

8. The blade structure according to any one of claims 1-6, characterized in that, The blade structure further includes a gasket assembly, which is disposed between the root and the upper blade clamp, and / or the gasket assembly is disposed between the root and the lower blade clamp.

9. The blade structure according to claim 8, characterized in that, The gasket assembly includes a friction-reducing gasket and a vibration-damping gasket. The friction-reducing gasket is used to reduce the friction force on the blade, and the vibration-damping gasket is used to absorb the vibration generated when the blade is working. The friction-reducing pad is attached to the blade, and the shock-absorbing pad is disposed on the side of the friction-reducing pad opposite to the blade.

10. A drone, characterized in that, Includes the blade structure as described in any one of claims 1-9.

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