Electric folding unmanned aerial vehicle arm

Abstract

This invention relates to a foldable drone arm, belonging to the field of drone technology, and solves the problem of slow drone response speed caused by the need for manual operation of foldable drone arms, which is time-consuming and labor-intensive. The foldable drone arm of this invention includes a foldable arm, an arm mounting base, and a power supply unit; the power supply unit can be connected to the foldable arm / arm mounting base; the foldable arm includes an electric locking component and an arm folding portion; the electric locking component is provided with a first engaging pair; the arm folding portion is provided with a second engaging pair; the first and second engaging pairs engage; the power supply unit drives the first and second engaging pairs to engage, enabling the foldable arm to automatically lock or disengage from the arm mounting base. This invention has a simple structure, simultaneously satisfying the problems of convenient arm assembly and disassembly and secure installation, achieving space saving in drone storage and transportation, enabling immediate takeoff, and ensuring safe flight.

Description

Technical Field

[0001] This invention relates to the field of drone technology, and more specifically to an electric folding drone arm. Background Technology

[0002] In recent years, drone technology has developed rapidly, with a wide variety of drones and applications. This has led to a growing demand for space-saving drone transportation and storage. A common practice is to fold or disassemble drone components that occupy significant storage space to facilitate transportation and storage. Among these, the drone's arms are a crucial component that requires folding or disassembly.

[0003] Currently, the commonly used methods for storing the robotic arm are as follows: disassembling the robotic arm, using a folding buckle to lock the robotic arm, using a folding nut to lock the robotic arm, or neither folding nor disassembling the robotic arm.

[0004] Various storage methods have their own problems, such as cumbersome disassembly, difficulty in managing various circuits, and poor installation stability. Not only are the disassembly and assembly operations complicated, but they are also prone to consequences such as water and electricity leaks and unstable installation. They not only require a high level of professionalism from the operator and are time-consuming and labor-intensive, but also easily lead to safety accidents involving drones.

[0005] Improving the ease of folding the drone arm is crucial for effectively saving storage and transportation space and ensuring the drone can start up instantly and fly safely. Summary of the Invention

[0006] Based on the above analysis, the present invention aims to provide an electric folding drone arm to solve the technical problem that the folding drone arm requires manual operation, which is time-consuming and labor-intensive, resulting in a slow drone response speed.

[0007] This invention is achieved through the following technical solution:

[0008] A foldable drone arm includes a foldable arm, an arm mounting base, and a power supply unit. The power supply unit can be connected to the foldable arm or the arm mounting base. The foldable arm includes an electric locking component and an arm folding portion. The electric locking component is provided with a first engagement pair. The arm folding portion is provided with a second engagement pair. The first and second engagement pairs engage. The power supply unit drives the first and second engagement pairs to engage, so that the foldable arm can automatically lock or disengage from the arm mounting base.

[0009] Furthermore, the electric locking component is an automatic locking nut; the automatic locking nut includes a nut locking part, which includes the nut rotating rack and the nut tightening internal thread as the first meshing pair.

[0010] Furthermore, the folding arm portion includes a positioning and locking portion, and the arm mounting base includes a mounting base retaining portion; the mounting base retaining portion and the positioning and locking portion can form an arm connecting portion, and the arm connecting portion has a continuous external thread; the power supply portion is connected to the arm connecting portion; the power supply portion includes a power source and a gear pair, the power source drives the gear pair to rotate, and the gear pair includes a driven gear; the driven gear meshes with the nut rotation rack of the automatic locking nut, and the external thread of the arm connecting portion meshes with the nut tightening internal thread of the automatic locking nut.

[0011] Furthermore, the automatic locking nut has a ring-type structure.

[0012] Furthermore, the automatic locking nut also includes a pre-tightening limiting groove, a damping limiting groove, and a nut positioning hole.

[0013] Furthermore, the arm folding section includes an arm folding positioning section and an arm folding power section.

[0014] Furthermore, the arm folding positioning part includes an arm folding part pivot, an arm folding part positioning sleeve, a power source fixing platform, an arm folding part rotation limit block, and the positioning locking part.

[0015] Furthermore, the positioning and locking part is a semi-enclosed sleeve structure, and the positioning and locking part is provided with a proximity switch mounting part, a machine arm folding positioning external thread part, and a driven tooth mounting part.

[0016] Furthermore, the arm folding power unit also includes an arm folding power retention unit.

[0017] Furthermore, the arm mounting base includes a mounting base body connecting part, a mounting base connecting part, and a mounting base arm connecting part that are connected and internally connected thereto.

[0018] Furthermore, the mounting base arm connecting part includes a mounting base rotating shaft part and a mounting base retaining part; the mounting base rotating shaft part is provided with a mounting base mounting hole; the mounting base retaining part is provided with a mounting base external thread.

[0019] Furthermore, the electric folding drone arm also includes an arm rubber ring.

[0020] Furthermore, the electric folding drone arm also includes an arm vibration damping sleeve.

[0021] Furthermore, the external thread of the arm connection and the internal thread of the nut tightening are matched and are both multi-threaded with a taper.

[0022] Compared with the prior art, the present invention can achieve at least the following beneficial effects:

[0023] The folding arm is hinged to the arm mounting base; when the folding arm is coaxial with the arm mounting base, a complete arm connection with continuous external threads is formed; the arm connection can be quickly locked or released by an electric locking nut, realizing the rapid conversion between the UAV arm and fuselage in an efficient and stable connection or folding state; the operation is efficient and convenient, realizing the rapid response of the UAV and meeting the needs of the UAV for instant start-up and safe flight.

[0024] The above-described technical solutions can also be combined with each other to achieve more preferred combinations. Other features and advantages of the present invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of the invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0025] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0026] Figure 1 This is a partial exploded view of the mounting structure of the folding drone arm installed on the fuselage of the present invention;

[0027] Figure 2 This is a schematic diagram of the overall structure of the folding drone arm mounted on the fuselage of the present invention;

[0028] Figure 3 This is a partial exploded view of the arm structure of the folding drone of the present invention;

[0029] Figure 4 for Figure 2 Sectional view along the EE direction;

[0030] Figure 5 This is a schematic diagram of the folding section of the arm in this invention;

[0031] Figure 6 for Figure 5 Sectional view in the FF direction;

[0032] Figure 7 This is a schematic diagram of the cage structure of the rotating power unit of the present invention;

[0033] Figure 8 This is a schematic diagram of the folding and rotating power unit of the arm of the present invention;

[0034] Figure 9 This is an exploded view of the automatic locking nut assembly of the present invention;

[0035] Figure 10 for Figure 9 Axial section diagram of the automatic locking nut assembly after assembly;

[0036] Figure 11 This is an exploded view of the arm mounting bracket assembly and the connected fuselage section of the present invention.

[0037] Figure 12 This is a schematic diagram of the arm mounting base structure of the present invention;

[0038] Figure 13 This is a schematic diagram of the rubber ring structure of the machine arm of the present invention;

[0039] Figure 14 This is a schematic diagram of the vibration damping sleeve structure of the machine arm of the present invention;

[0040] Figure 15 This is a schematic diagram of the structure of the folding drone arm of the present invention at the maximum folding position of the fuselage.

[0041] Figure label:

[0042] 1. Fuselage section; 11. Fuselage shell mounting hole; 2. Folding arm; 21. Arm tube section; 211. Arm propeller mounting end; 212. Arm clearance slot; 213. Arm limit slot; 22. Automatic locking nut; 221. Nut locking part; 2211. Nut rotating rack; 2212. Nut tightening internal thread; 222. Preload limit slot; 223. Damping limit slot; 224. Nut rotation direction mark; 225. Nut positioning hole; 2 3. Arm folding section; 231. Arm folding positioning section; 2311. Arm folding positioning section pivot; 23111. Arm folding section pivot hole; 2312. Positioning locking section; 23121. Proximity switch mounting section; 23122. Arm folding positioning external thread section; 23123. Driven gear mounting section; 23124. Arm folding positioning guide section; 2313. Arm folding section positioning sleeve; 23131. Arm folding section arm tube positioning boss ; 2314. Power source mounting platform; 23141. Power source mounting platform mounting hole; 2315. Arm folding section rotation limit block; 23151. Arm folding section rotation limit surface; 232. Arm folding power unit; 2321. Arm folding power retention unit; 23211. Cage lower plate; 23212. Cage reinforcing ring plate; 23213. Cage upper plate; 23214. Power source mounting post; 23215. Retention unit mounting post; 23 22. Power source; 2323. Drive gear; 2324. Driven gear; 2325. Coupling; 3. Arm mounting base; 31. Mounting base body connection part; 311. Arm mounting base body connection hole; 32. Mounting base arm connection part; 321. Mounting base rotating shaft part; 3211. Mounting base mounting hole; 322. Mounting base retaining part; 3221. Mounting base external thread; 3222. Mounting base retaining part external thread; 33. Mounting base connecting part;

[0043] 41. Proximity switch; 42. Insert sleeve; 43. Anti-loosening nut; 44. Shaft screw; 45. Preload O-ring; 46. Damping O-ring; 47. Boom vibration damping sleeve; 471. Outer clamping part of boom vibration damping sleeve; 472. Inner clamping part of boom vibration damping sleeve; 48. Boom rubber ring; 481. Small end of boom rubber ring; 482. Large end of boom rubber ring; 4821. Buffer groove of boom rubber ring; 483. Waterproof blade. Detailed Implementation

[0044] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0045] Combination Figures 1-15 The technical solution of the present invention will be described in more detail below:

[0046] In this embodiment, the arm folding section pivot 2311 is provided with an inner hole structure, D is the minimum inner diameter of the inner hole structure of the arm folding section pivot 2311, and A, B and C are all angle values; the end of each part that is close to the body 1 is the proximal end, and the end of each part that is far from the body 1 is the distal end.

[0047] The foldable drone arm of this embodiment includes a foldable arm 2, an arm mounting base 3, and a power supply unit.

[0048] The proximal end of the arm mounting base 3 is connected to the fuselage 1 of the drone, and the distal end of the arm mounting base 3 is connected to the proximal end of the folding arm 2. The distal end of the folding arm 2 is connected to the propeller of the drone. The power supply unit can be connected to the folding arm 2 or to the arm mounting base 3; the power supply unit provides kinetic energy, specifically electrical energy, for automatically locking or disengaging the folding arm 2 from the arm mounting base 3.

[0049] The folding arm 2 includes an electric locking mechanism and an arm folding section 23.

[0050] The electric locking component can be a nut-type fastener with an internal meshing pair, or a screw-pin-type fastener with an external meshing pair. Definition: The meshing structure on the electric locking component is the first meshing pair.

[0051] Correspondingly, the folding section of the arm can be a functional structural component with an external engagement structure or a functional structural component with an internal engagement structure. Assume: the engagement structure on the folding section of the arm is a second engagement pair.

[0052] In this embodiment, the power supply unit drives the first meshing pair and the second meshing pair to engage, so that the folding arm 2 and the arm mounting seat 3 are electrically locked or separated.

[0053] This embodiment specifically adopts the following preferred technical solution:

[0054] like Figure 1 and Figure 15 As shown, the electric folding drone arm in this embodiment includes a folding arm 2 and an arm mounting base 3.

[0055] like Figure 2 As shown, the folding arm 2 in this embodiment includes an arm tube 21, an automatic locking nut 22, and an arm folding section 23.

[0056] like Figure 1 and Figure 4 As shown, the arm folding part 23 is hinged to the arm mounting base 3 at its proximal end; the arm folding part 23 is connected to the straight tube portion at the proximal end of the arm tube part 21 at its distal end.

[0057] When the drone is in storage and transportation mode, the automatic locking nut 22 is slidably connected to the arm tube 21.

[0058] like Figure 4 As shown, the arm folding section 23 includes an arm folding positioning section 231 and an arm folding rotation power section 232. The arm folding rotation power section 232 is coaxially connected to the arm folding positioning section 231.

[0059] like Figure 5 and Figure 6 As shown, the arm folding positioning part 231 includes an arm folding part pivot part 2311, a positioning locking part 2312, an arm folding part positioning sleeve 2313, a power source fixing platform 2314, and an arm folding part rotation limit block 2315.

[0060] Specifically, the boom folding section pivot 2311 is a semi-cylindrical pivot structure, on which an axial boom folding section pivot hole 23111 is provided, which is used to hinge the boom mounting base 3.

[0061] Preferably, an inlaid sleeve 42 is provided inside the pivot hole 23111 of the folding part of the arm to facilitate the smooth rotation of the hinge shaft within the inlaid sleeve 42.

[0062] The semi-cylindrical shaft structure of the boom folding section pivot 2311 is smoothly connected to the outer generatrix of the outer ring of the boom folding section positioning sleeve 2313, and is located at the front end of the boom folding section positioning sleeve 2313. The boom folding section pivot 2311 and the boom folding section positioning sleeve 2313 are combined into a whole.

[0063] The maximum outer diameter of the arm folding section positioning sleeve 2313 is located at the distal end of the arm folding positioning section pivot 2311, and the maximum outer diameter of the arm folding section positioning sleeve 2313 is the same as the outer diameter of the straight tube of the arm tube 21. A stepped shaft is provided distally at the maximum outer diameter D of the arm folding section positioning sleeve 2313, and the diameter of the stepped shaft at the distal end of the arm folding section positioning sleeve 2313 is equal to the inner diameter of the straight tube of the arm tube 21. The stepped shaft at the distal end of the arm folding section positioning sleeve 2313 is used to position the inner wall surface of the arm tube 21.

[0064] Preferably, the arm folding part positioning sleeve 2313 has an outer guide portion of the arm folding part shaft with a tapered angle of B, which tapers outwards on the outer side near the proximal end; the arm folding part positioning sleeve 2313 has an inner guide portion of the arm folding part shaft with a tapered angle of C extending from the maximum inner diameter D towards both ends. The tapered angle at the proximal end facilitates the tightening or unscrewing of the arm folding part 23 relative to the rotating arm mounting seat 3; the tapered angle at the distal end facilitates the insertion and positioning of the arm tube 21 on the arm folding part positioning sleeve 2313. The tapered angle serves as a draft angle for convenient machining.

[0065] Further preferred values ​​are B < 10° and C < 5°.

[0066] Preferably, at the stepped shaft platform of the arm folding part positioning sleeve 2313, a positioning boss 23131 for the arm tube of the arm folding part is provided at the far end to correctly position the straight tube of the arm tube 21, so that the straight tube of the arm tube 21 can be correctly positioned between the arm folding part positioning sleeve 2313 and the positioning locking part 2312 in one go, ensuring that the arm propeller mounting end 211 at the far end of the arm tube 21 is in the correct position.

[0067] Preferably, a power source fixing platform 2314 is provided around the maximum diameter of the positioning sleeve 2313 of the arm folding section. In this embodiment, the power source fixing platform 2314 can be a circular platform or other circumferential mounting platform. The power source fixing platform 2314 is provided with a power source fixing platform mounting hole 23141 for screwing the arm folding power unit 232.

[0068] Specifically, the positioning and locking part 2312 is a semi-enclosed sleeve structure, and the positioning sleeve 2313 of the arm folding part is concentrically arranged and located on the same side of the arm folding part pivot part 2311. The distance between the positioning and locking part 2312 and the positioning sleeve 2313 of the arm folding part is equal to the wall thickness of the straight tube near the end of the arm tube part 21.

[0069] The semi-enclosed sleeve structure of the positioning and locking part 2312 is provided with a proximity switch mounting part 23121, a folding positioning external thread part 23122, a driven gear mounting part 23123 and a folding positioning guide part 23124.

[0070] A position proximity switch 41 is installed at the proximity switch mounting part 23121. The contact of the position proximity switch 41 faces the far end. When the automatic locking nut 22 contacts the contact of the position proximity switch 41, the UAV flight control center controls the automatic locking nut 22 to stop rotating based on the signal from the position proximity switch 41.

[0071] The outer arc surface of the semi-enclosed sleeve structure of the positioning and locking part 2312 has external threads, which is the arm folding positioning external thread part 23122; the arm folding positioning guide part 23124 is located on the outer side of the distal end of the positioning and locking part 2312; the proximity switch mounting part 121 and the driven tooth mounting part 23123 are arranged along the generatrix at the center of the generatrix of the semi-enclosed sleeve structure of the positioning and locking part 23122, located at both ends of the arm folding positioning external thread part 23122. Among them, the proximity switch mounting part 121 is located at the proximal end of the positioning and locking part 23122.

[0072] Preferably, in this embodiment, the proximity switch mounting portion 121 and the driven tooth mounting portion 23123 are rectangular openings that pass through the positioning and locking portion 2312.

[0073] Specifically, the outer side of the end of the positioning and locking part 2312 is also provided with a folding positioning guide part 23124 with a cone angle of B, which facilitates the automatic locking nut 22 to be screwed in.

[0074] Preferably, the external thread 23122 for arm folding positioning is a multi-threaded thread with a taper, specifically a 4-threaded thread with a taper angle of A.

[0075] For further optimization, A < 1°.

[0076] The multi-thread design allows the automatic locking nut 22 to achieve multiple rotations in one turn, thereby increasing the rotation speed of the automatic locking nut 22 and achieving quick disassembly and assembly of the machine arm, thus improving the speed of disassembly and assembly of the machine arm and the ease of use.

[0077] The setting of the cone angle A ensures that the automatic locking nut 22 is relatively loose before initially entering the predetermined position, allowing it to be screwed in smoothly, while also reducing the difficulty of machining tolerances.

[0078] At the connection point between the boom folding section pivot 2311, the boom folding section positioning sleeve 2313, and the positioning locking part 2312, a boom folding section rotation limit block 2315 is provided. The boom folding section rotation limit block 2315 is provided with a boom folding section rotation limit surface 23151.

[0079] like Figure 15As shown, when the folding arm 23 drives the arm tube 21 to rotate around the hinge axis to a certain angle and surround the side of the body 1, the rotation limiting surface 23151 of the folding arm 2 contacts the edge of the body arm connection part of the body 1, and the folding arm 2 is limited and no longer rotates.

[0080] Figure 15 Only the extreme folding angle of the folding arm 2 is shown, but the folding angle of the folding arm 2 is not limited to this one angle. The folding arm 2 can also have any other folding angle within the extreme folding angle range.

[0081] Preferably, the shape of the rotation limiting surface 2351 is designed according to the shape of the connecting part of the fuselage and arm that it contacts. Specifically, the part where the rotation limiting surface 2351 first contacts the fuselage 1 is designed as an arc surface tangent to the contact surface of the fuselage 1 to alleviate the damage caused by contact stress at the moment of contact; the part where the rotation limiting surface 2351 contacts the fuselage 1 is designed to follow the shape of the contact surface of the fuselage 1 to ensure that the folding arm 2 is attached to the side of the fuselage 1 at the maximum turning angle, thus ensuring the stability of the relative position.

[0082] Combination Figure 4 and Figure 8 As shown, the arm folding power unit 232 is installed inside the arm folding part positioning sleeve 2313 and is fastened to the power source fixing platform 2314 from the far end to the near end by fasteners.

[0083] like Figure 8 As shown, the arm folding power unit 232 includes an arm folding power holding unit 2321 and a power supply unit. The power supply unit is coaxially disposed within the arm folding power holding unit 2321.

[0084] The power supply unit includes a power source 2322, a gear pair, and a coupling 2325. The gear pair includes a driving gear 2323 and a driven gear 2324.

[0085] like Figure 7 As shown, the arm folding power holding part 2321 includes a lower cage plate 23211, a cage reinforcing ring plate 23212, an upper cage plate 23213, a power source mounting post 23214, and a holding part mounting post 23215.

[0086] The lower cage plate 23211 and upper cage plate 23213 are circular plate structures with radii smaller than the minimum inner diameter of the arm folding section positioning sleeve 2313. The cage reinforcing ring plate 23212 is a partially circular ring structure. The lower cage plate 23211, the cage reinforcing ring plate 23212, and the upper cage plate 23213 are connected sequentially. Mounting positions for the driving gear 2323 and the driven gear 2324 are reserved at the center and opening of the cage reinforcing ring plate 23212. Multiple power source mounting posts 23214 are evenly distributed on the upper cage plate 23213, as well as multiple retaining section mounting posts 23215 that are staggered from the power source mounting posts 23214. The ends of both the power source mounting posts 23214 and the retaining section mounting posts 23215 are provided with screw holes.

[0087] The driving gear 2323 and the driven gear 2324 are installed between the lower plate 23211 and the upper plate 23213 of the cage. The driven gear 2324 passes through the rectangular opening of the driven gear mounting part 23123, and the meshing teeth of the driven gear 2324 can extend out of the outer circle of the positioning locking part 2312 and mesh with the internal thread of the automatic locking nut 22.

[0088] The output shaft at the second end of the power source 2322 transmits rotational power to the drive gear 2323 via coupling 2325. The drive gear 2323 meshes with the driven gear 2324, which in turn meshes with the automatic locking nut 22. The rotational power of the power source 2322 is then transmitted to the automatic locking nut 22, which begins to automatically tighten or loosen.

[0089] The first end of the power source 2322 is supported on the upper surface of the power source mounting column 23214 and fixed to the power source mounting column 23214 by fasteners; the end of the retaining part mounting column 23215 contacts the far end of the power source fixing platform 2314 and connects the arm folding power part 232 to the power source fixing platform 2314 by fasteners, and is fixedly connected to the arm folding positioning part 231.

[0090] Combination Figure 1 and Figure 3 As shown, the main structure of the arm tube section 21 is made of carbon steel tubing.

[0091] Specifically, the near end of the arm tube 21 is provided with an arm clearance slot 212 and an arm limiting slot 213. The arm clearance slot 212 is used to secure itself to the arm tube positioning boss 23131 of the arm folding part, so as to correctly position the arm tube 21 and the arm folding part 23.

[0092] Specifically, a boom propeller mounting end 211 is provided at the distal end of the boom tube 21. The structure of the boom propeller mounting end 211 matches the mounting structure design of the propeller section.

[0093] Preferably, the folding part 23 of the arm is fixed to the near end of the arm tube 21 by plastic injection molding or adhesive bonding, and is connected to the fastening part of the folding part of the arm by rivets, thereby fixing the folding part 23 of the arm to the arm tube 21.

[0094] This secondary fixing method can effectively prevent the arm tube 21 from falling off, ensure the structural integrity of the arm folding part 23 and the arm tube 21, and make the arm tube 21 and the arm folding part 23 have good follow-up.

[0095] In this embodiment, the arm mounting base 3 includes a mounting base retaining part 322, which is a semi-enclosed sleeve structure with external threads. When the folding arm 2 is coaxially connected with the arm mounting base 3, the positioning locking part 2312 and the mounting base retaining part 322 form a complete sleeve structure arm connection part. A continuous external thread is formed on the arm connection part. The external thread of the arm connection part and the nut tightening internal thread 2212 of the automatic locking nut 22 have a matching taper multi-thread.

[0096] On the folding part 23 of the arm, the driven gear 2324 and the external thread of the arm connection part constitute a second meshing pair.

[0097] Combination Figure 1 , Figure 3 and Figure 15 As shown, in the storage and transportation state of the UAV, the automatic locking nut 22 is slidably connected to the carbon tube in the middle of the arm tube 21, and the connection is tight.

[0098] Combination Figure 2 and Figure 4 As shown, when the UAV is started or in flight, the automatic locking nut 22 is screwed onto the connecting part that connects the arm folding part 23 and the arm mounting base 3 assembly.

[0099] like Figure 9 , Figure 10 and Figure 14 As shown, the automatic locking nut 22 has a ring-shaped structure, including a nut locking part 221, a pre-tightening limiting groove 222, a damping limiting groove 223 and a nut positioning hole 225 arranged in sequence inside the ring.

[0100] The UAV flight control center controls the automatic locking nut 22 to stop rotating after it is screwed into place, based on the signal from the proximity switch 41. The UAV flight control center is equipped with the travel data of the stepper motor of the power source 2322, and can transmit electronic commands to the power source 2322 to control the automatic locking nut 22 to start screwing in and stop screwing out.

[0101] The automatic locking nut 22 also includes a nut rotation direction mark 224 set on the outside of the ring sleeve. The nut rotation direction mark 224 helps the operator to operate quickly and correctly at any work position, reflecting the ease of use of the electric folding drone arm.

[0102] The inner cylindrical surface of the nut positioning hole 225 has a diameter not less than the outer diameter of the straight tube section of the boom tube 21; the damping limiting groove 223 is provided on the nut positioning hole 225, and the pre-tightening limiting groove 222 is provided at the tail end of the nut locking part 221.

[0103] The damping O-ring 46 is tightly fitted in the damping limiting groove 223. The damping O-ring 46 can effectively prevent the automatic locking nut 22 from sliding on the carbon tube in the middle of the arm tube 21 in the non-locked state, and effectively position the automatic locking nut 22 in the guide part inside the arm folding shaft of the arm folding part 23 in the locked state, so as to maintain the structural stability of the UAV in flight.

[0104] The pre-tightening O-ring 45 is set in the pre-tightening limit groove 222; the pre-tightening O-ring 45 can increase the pre-tightening force between the automatic locking nut 22 and the arm folding part 23 and the arm mounting seat 3 during the locking process, ensuring that the automatic locking nut 22 does not loosen, so as to maintain the structural stability of the UAV in flight.

[0105] In this embodiment, the nut locking part 221 has a composite thread structure, including a nut rotating rack 2211 and a nut tightening internal thread 2212. The nut rotating rack 2211 and the nut tightening internal thread 2212 together form a first meshing pair. The nut rotating rack 2211 meshes with the driven gear 2324, and the nut tightening internal thread 2212 matches the external thread of the arm connection part formed by the positioning locking part 2312 and the mounting seat retaining part 322. Preferably, the nut tightening internal thread 2212 is a tapered multi-start thread that matches the external thread of the arm connection part, specifically a 4-start thread with a taper angle of A.

[0106] In the installed state, the internal thread 2212 of the nut is tightened in the opposite direction to the taper of the external thread of the arm connection. After installation, the screw pair fits tightly.

[0107] like Figure 11 As shown, in this embodiment, a fuselage arm connecting part is provided on the fuselage 1 housing, and a plurality of fuselage housing mounting holes 11 are provided at the fuselage arm connecting part for connecting the arm mounting base 3.

[0108] like Figure 12 As shown, the boom mounting base 3 includes a mounting base body connecting part 31, a mounting base connecting part 33, and a mounting base boom connecting part 32, which are connected and internally connected. A boom rubber ring 48 is provided on the inner wall of the mounting base connecting part 33, and a boom vibration damping sleeve 47 is provided on the outer wall of the mounting base connecting part 33.

[0109] Specifically, the mounting base fuselage connection part 31 is used to connect to the fuselage part 1. The structure of the mounting base fuselage connection part 31 matches the design of the fuselage arm connection part. The mounting base fuselage connection part 31 is provided with an arm mounting base fuselage connection hole 311 that matches the fuselage housing mounting hole 11. The UAV arm mounting base 3 is fixedly connected to the UAV arm mounting base 3 through the fuselage connection fastening assembly.

[0110] For drones with large carrying capacity, the drone arm mounting base 3 in this embodiment can preferably be a metal part, and the fuselage connection fastening component is a bolt, or a combination of bolts and nuts. The fuselage connection hole 311 of the arm mounting base is provided with internal threads at both ends.

[0111] For small drones, the arm mounting base 3 in this embodiment is preferably an injection-molded part. The fuselage connection and fastening assembly consists of knurled copper studs, knurled copper sleeves, and screws with internal threaded holes at both ends.

[0112] Specifically, firstly, the knurled copper studs and knurled copper sleeves are inserted into the body connection hole 311 of the arm mounting base 3 by plastic injection molding; then, the arm mounting base 3 is fastened to the body arm connection part of the body 1 housing; and then the arm mounting base 3 is fastened to the body arm connection part from both sides with screws.

[0113] The mounting arm connection part 32 includes a mounting base rotating shaft part 321 and a mounting base holding part 322, the mounting base holding part 322 being a semi-enclosed sleeve structure. The outer side of the semi-enclosed sleeve structure of the mounting base holding part 322 is provided with a mounting base external thread 3221.

[0114] Preferably, the central angle of the semi-enclosed sleeve structure of the mounting base retainer 322 is less than or equal to 180°.

[0115] Preferably, the external thread 3221 of the mounting base is a multi-start thread with a taper, specifically a 4-start thread with a taper angle of A.

[0116] Preferably, in the installed state, the mounting seat retaining part 322 and the positioning locking part 2312, which are both semi-enclosed sleeve structures, are assembled into a complete ring structure, and the mounting seat external thread 3221 and the arm folding positioning external thread 23122 form a continuous arm connection external thread with the same taper direction.

[0117] In the installed state, the external thread of the assembled arm connection has the opposite taper to the internal thread 2212 of the nut tightening part 221 on the automatic locking nut 22, so they can be matched and connected.

[0118] The mounting base rotating shaft portion 321 is an ear plate structure with mounting base mounting holes 3211. Two mounting base rotating shaft portions 321 are mirror-symmetrically arranged on the end side of the mounting base holding portion 322 near the mounting base connecting portion 33.

[0119] The distance between the two mounting base rotating shafts 321 is equal to the height of the arm folding section rotating shaft 2311. In the installed state, the two opposing mounting base mounting holes 3211 are in communication with the arm folding section rotating shaft hole 23111, and an insert sleeve 42 is provided in the mounting base mounting hole 3211.

[0120] like Figure 1 As shown, in a preferred embodiment, a pivot screw 44 and a lock nut 43 are used to rotatably hinge the folding part 23 of the arm to the arm mounting base 3 through two mounting holes 3211 and an insert sleeve 42. The pivot screw 44 has a smooth rod structure in the middle.

[0121] like Figure 4 As shown, the mounting base connecting part 33 is used to transitionally connect the mounting base body connecting part 31 and the mounting base arm connecting part 32 via an elastic element. The elastic element includes an arm rubber ring 48 provided on the inner wall surface of the mounting base connecting part 33 and an arm vibration damping sleeve 47 provided on the outer wall surface of the mounting base connecting part 33.

[0122] The boom damping sleeve 47 is used for elastic contact connection between the mounting base connection part 33 and the body boom connection part provided on the housing of the body part 1.

[0123] like Figure 14 As shown, the boom damping sleeve 47 is an annular groove structure with two side walls. The two side walls are the outer clamping part 471 of the boom damping sleeve located on the inner wall of the fuselage 1 housing and the inner clamping part 472 of the boom damping sleeve located on the outer wall of the fuselage 1 housing.

[0124] The arm damping sleeve 47 prevents liquid outside the folding arm 2 from entering the body 1 at the connection point with the body 1 by clamping, thus improving waterproof performance and effectively protecting the safety of the electrical components inside the body.

[0125] like Figure 4 and Figure 13 As shown, the boom rubber ring 48 is a stepped bushing structure, including a small end 481 and a large end 482 of the boom rubber ring, as well as multiple fan-shaped waterproof blades 483 disposed inside the stepped bushing of the boom rubber ring 48 and a boom rubber ring buffer groove 4821 disposed on the side wall of the large end 482 of the boom rubber ring.

[0126] Multiple fan-shaped waterproof blades 483 are circumferentially suspended with a hollow center. Without losing elasticity and deformation, they prevent fluid from entering the fuselage 1 from the inside of the folding arm 2, further improving the waterproofness of the electric folding drone arm to the fuselage 1.

[0127] Multiple arm rubber ring buffer grooves 4821 enable the arm rubber ring 48 to have greater elastic deformation under the same mass, which can effectively alleviate the impact force during the process of the arm folding part 23 rotating in and out relative to the arm mounting seat 3, and protect the structural safety of the UAV.

[0128] The arm rubber ring 48 is interference-fitted in both the axial and radial directions. That is, the outer side of the arm rubber ring 48 is used to squeeze and limit the arm rubber ring 48 at the arm mounting seat 3, and the shaft end of the large end 482 of the arm rubber ring squeezes and abuts against the near end of the arm folding part 23.

[0129] The arm rubber ring 48 is internally interference-limited between the arm folding part 23 and the fuselage part 1, which can reduce the vibration transmitted from the folded arm 2 to the fuselage part 1 and improve the safety of the UAV structure and its electrical components.

[0130] In this embodiment, the arm mounting base 3 is semi-enclosed with the arm folding part 23 to form a complete external thread structure, and is locked by the automatic locking nut 22. This connection structure can eliminate the fitting gap between the connecting parts, improve the assembly rigidity between the arms of the electric folding drone and between the arms and the fuselage 1, thereby reducing the swaying of the folding drone arms and improving the safety of drone flight.

[0131] Meanwhile, the automatic locking nut 22 engages with the arm mounting base 3 and the arm folding part 23 at multiple inclined surfaces, increasing the contact area and thus reducing localized stress concentration, thereby ensuring the strength requirements of the electric folding drone arm.

[0132] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Furthermore, any equipment or facilities equipped with this device to expand the application field and produce combined technical effects are within the scope of protection of this invention.

Claims

1. A foldable drone arm, characterized in that, It includes a folding arm (2), an arm mounting base (3), and a power supply unit; The power supply unit can be connected to the folding arm (2) / arm mounting base (3); The folding arm (2) includes an electric locking component and an arm folding section (23). The electric locking component is provided with a first meshing pair; the folding part (23) of the arm is provided with a second meshing pair; the first meshing pair and the second meshing pair perform meshing motion; The power supply unit drives the first meshing pair to mesh with the second meshing pair, so that the folding arm (2) can automatically lock or separate from the arm mounting base (3); The electric locking component is an automatic locking nut (22); the automatic locking nut (22) includes a nut locking part (221), which includes a nut rotating rack (2211) and a nut tightening internal thread (2212) as the first meshing pair.

2. The folding drone arm of claim 1, wherein The arm folding part (23) includes a positioning locking part (2312), and the arm mounting base (3) includes a mounting base retaining part (322). The mounting base retaining part (322) and the positioning locking part (2312) can form a machine arm connecting part, which has a continuous external thread; The power supply unit is connected to the folding part (23) of the arm; the power supply unit includes a power source (2322) and a gear pair, the power source (2322) drives the gear pair to rotate; the gear pair includes a driven gear (2324). The driven gear (2324) and the external thread of the arm connection constitute the second meshing pair; The driven gear (2324) meshes with the nut rotating rack (2211) of the automatic locking nut (22); the external thread of the arm connection meshes with the nut tightening internal thread (2212) of the automatic locking nut (22).

3. The folding drone arm of claim 2, wherein, The automatic locking nut (22) also includes a pre-tightening limiting groove (222), a damping limiting groove (223), and a nut positioning hole (225).

4. The folding drone arm of claim 3, wherein, The arm folding section (23) includes an arm folding positioning section (231) and an arm folding power section (232).

5. The folding drone arm according to claim 4, characterized in that, The positioning and locking part (2312) is a semi-enclosed sleeve structure.

6. The folding drone arm according to claim 5, characterized in that, The arm folding power unit (232) also includes an arm folding power holding unit (2321).

7. The folding drone arm according to any one of claims 1-6, characterized in that, The arm mounting base (3) includes a mounting base body connecting part (31), a mounting base connecting part (33), and a mounting base arm connecting part (32) that are connected in sequence and have internal penetration.

8. The folding drone arm according to claim 7, characterized in that, The mounting arm connection part (32) includes a mounting base rotating shaft part (321) and a mounting base holding part (322); the mounting base rotating shaft part (321) is provided with a mounting base mounting hole (3211); the mounting base holding part (322) is provided with a mounting base external thread (3221).

9. The folding drone arm according to claim 2, characterized in that, The external thread of the arm connection and the internal thread (2212) of the nut tightening are matched and are both multi-threaded threads with a taper.

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