Arm folding mechanism, unmanned aerial vehicle folding arm and unmanned aerial vehicle

Abstract

The invention relates to the technical field of unmanned aerial vehicle devices, and provides an arm folding mechanism, an unmanned aerial vehicle folding arm and an unmanned aerial vehicle. The arm folding mechanism comprises a first folding piece, a buckle assembly and a second folding piece. Wherein the first folding piece is rotationally connected with one end of the second folding piece through a vehicle arm rotating shaft; an elastic buckle assembly is arranged at one end of the second folding piece and on the opposite side of the vehicle arm rotating shaft, and an elastic buckle is arranged on the side edge, close to the first folding piece, of the elastic buckle assembly; a fixed base is arranged on the first folding piece and on the opposite side of the vehicle arm rotating shaft, and the buckle assembly is fixed to the fixed base; the buckle assembly comprises a clamping hook and a movable locking piece. When the first folding piece and / or the second folding piece are / is unfolded around the vehicle arm rotating shaft, the clamping hook is used for being buckled with the elastic buckle, and the movable locking piece rotates to press the elastic buckle and is used for locking the relative displacement between the elastic buckle and the clamping hook.

Description

Technical Field

[0001] The present invention relates to the technical field of unmanned aerial vehicle devices, and more specifically, to an arm folding mechanism, a folding arm of an unmanned aerial vehicle, and an unmanned aerial vehicle. Background Art

[0002] With the rapid development of drone technology, multi-rotor drones have the advantages of being agile and lightweight, able to hover, and able to take off and land at any location. They can be equipped with detection equipment such as visible light sensors, infrared imagers, and cameras, and can more conveniently and quickly achieve tasks such as reconnaissance and aerial photography. They are widely used in power line inspection, traffic monitoring, land surveying and mapping, ocean and water conservancy monitoring and other application fields. As the application occasions become more and more extensive, the demand for drone-mounted loads is also increasing. The arm span requirements of such drones have increased, which brings troubles to engineering transportation and storage, and is not convenient for fast and flexible implementation of various engineering work. To this end, the use of foldable arms can greatly reduce the overall size of the body, making it easier to store and transport.

[0003] The existing folding arm structure usually uses a folding assembly with a locking structure to connect the arm. The locking structure generally uses a locking buckle formed by a boss and a groove, or other locking parts. However, when this conventional locking structure is applied to the arm of a drone, there is a problem of low structural connection reliability, especially when the drone is carrying heavy objects, it is easy to cause the folding arm to loosen. Summary of the invention

[0004] In order to overcome the defect of low structural connection reliability of the above-mentioned existing folding arms, the present invention provides an arm folding mechanism, a folding arm for unmanned aerial vehicles and a unmanned aerial vehicle.

[0005] In order to solve the above technical problems, the technical solution of the present invention is as follows:

[0006] A machine arm folding mechanism comprises a first folding member, a buckle assembly and a second folding member; wherein: the first folding member is rotatably connected to one end of the second folding member through a machine arm rotating shaft; a snap assembly is provided at one end of the second folding member and on the opposite side of the machine arm rotating shaft, and a snap is provided on one side of the snap assembly close to the first folding member; a fixed base is provided on the first folding member and on the opposite side of the machine arm rotating shaft, and the buckle assembly is fixed on the fixed base; the buckle assembly comprises a hook and a movable locking member.

[0007] When the first folding member and / or the second folding member are unfolded around the arm rotation axis, the hook is used to engage with the spring buckle, and the movable locking member is rotated to press the spring buckle to lock the relative displacement between the spring buckle and the hook.

[0008] When the first folding member and / or the second folding member is folded around the arm shaft, the movable locking member is rotated to release it from the spring buckle, the spring buckle is pressed to disengage the hook, and the first folding member and the second folding member are bent to complete the folding.

[0009] As a preferred embodiment, the buckle assembly includes a buckle base, a screw hole is provided on the buckle base, and the movable locking part is connected to the buckle base through the screw hole by a gasket and a locking screw; the movable locking part rotates around the locking screw as a rotating axis; the hook is arranged on the buckle base and on the side close to the second folding part.

[0010] As a preferred solution, a positioning hole is provided at the bottom of one side of the movable locking piece, a positioning bead is installed in the positioning hole, and the positioning bead is connected to the bottom of the positioning hole through an elastic element; when the hook is engaged with the spring buckle and the movable locking piece is rotated so that one side of the movable locking piece is located above the spring buckle, the positioning bead elastically abuts against the upper surface of the spring buckle.

[0011] As a preferred solution, a limiting boss is further provided on the buckle base; when the hook is engaged with the spring buckle and the movable locking member is rotated to tighten the spring buckle, the limiting boss abuts against the side of the movable locking member.

[0012] As a preferred embodiment, a pin hole is provided on the buckle base and on the rotation path of the movable locking piece; a pin is installed in the pin hole, and the pin is connected to the bottom of the pin hole through an elastic element; a pin extension portion is provided on one side of the spring buckle close to the buckle assembly; when the machine arm is in a folded state, the pin extends out of the pin hole under the action of the elastic element, and the side of the pin abuts against the side of the movable locking piece; when the machine arm is in an unfolded state and the hook is buckled with the spring buckle, the bottom of the spring buckle extension abuts against the pin and compresses the pin downward into the pin hole.

[0013] As a preferred embodiment, the snap-on assembly includes a snap-on base, and the snap-on is rotatably connected to the snap-on base via a rotating shaft; at least one compression spring is connected between the snap-on and the snap-on base.

[0014] As a preferred solution, a first connecting hole is provided at one end of the first folding member close to the second folding member; a connecting portion for rotationally connecting with the first folding member is provided at one end of the second folding member, and second connecting holes are provided at both sides of the connecting portion; after the end of the arm shaft passes through the second connecting hole, it is fixedly connected to the first connecting hole by a locking screw to form a rotating pair.

[0015] As a preferred solution, a lubricating copper sleeve is provided on the inner wall of the first connecting hole and / or the second connecting hole, and the lubricating copper sleeve is interference fit with the first connecting hole and / or the second connecting hole.

[0016] Furthermore, the present invention also proposes a folding arm of a drone, comprising an arm connected to the arm folding mechanism proposed in the present invention.

[0017] Furthermore, the present invention also proposes a drone, comprising a drone body, wherein the drone body is connected to at least one of the arm folding mechanisms proposed in the present invention.

[0018] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0019] The present invention adopts a combination of a spring buckle and a hook to realize the connection and fixation between the first folding member and the second folding member, and further cooperates with a movable locking member to lock the clamping structure of the spring buckle and the hook to prevent the arm folding mechanism from loosening during use;

[0020] The present invention adopts a movable locking piece to effectively compress the matching gap between the arm spring buckle and the buckle, thereby ensuring the stability of the buckling structure of the folding arm structure and reducing the instability of the aircraft flight caused by the vibration of the arm. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure is a schematic structural diagram of an arm folding mechanism according to an embodiment of the present invention.

[0022] Figure 2 The figure is an exploded view of a buckle assembly according to an embodiment of the present invention.

[0023] Figure 3 It is a schematic diagram showing a buckle assembly in a locked snap-fastened state according to an embodiment of the present invention.

[0024] Figure 4 It is a schematic diagram showing a buckle assembly in a released buckle state according to an embodiment of the present invention.

[0025] Figure 5 The figure is an exploded view of a snap button assembly according to an embodiment of the present invention.

[0026] Figure 6 The figure is an exploded view of an arm folding mechanism according to an embodiment of the present invention.

[0027] Figure 7 The figure is a schematic diagram of the unfolded state of the folding arms of a drone according to an embodiment of the present invention.

[0028] Among them, 100-first folding part, 110-arm shaft, 120-fixed base, 130-first connecting hole, 200-second folding part, 210-connecting part, 211-second connecting hole, 220-lubricating copper sleeve, 300-buckle assembly, 310-hook, 320-movable locking part, 321-gasket, 322-locking screw, 323-positioning hole, 324-positioning bead, 330-buckle base, 331-screw hole, 332-limiting boss, 333-thimble hole, 334-thimble, 400-spring buckle assembly, 410-spring buckle, 411-spring buckle extension, 420-spring buckle base, 430-compression spring. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] Furthermore, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0033] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] Example 1

[0035] This embodiment proposes an arm folding mechanism, such as Figure 1 The figure is a schematic diagram of the structure of the arm folding mechanism of this embodiment.

[0036] The arm folding mechanism proposed in this embodiment includes a first folding member 100 , a buckle assembly 300 , a second folding member 200 and a snap assembly 400 .

[0037] Among them, the first folding member 100 is rotatably connected to one end of the second folding member 200 through the arm rotating shaft 110; the snap assembly 400 is arranged at one end of the second folding member 200 and on the opposite side of the arm rotating shaft 110, and a snap 410 is arranged on one side of the snap assembly 400 close to the first folding member 100; a fixed base 120 is arranged on the first folding member 100 and on the opposite side of the arm rotating shaft 110, and the buckle assembly 300 is fixed on the fixed base 120; the buckle assembly 300 includes a hook 310 and a movable locking member 320.

[0038] When the first folding member 100 and / or the second folding member 200 are unfolded around the arm rotation axis 110, the hook 310 is used to engage with the spring buckle 410, and the movable locking member 320 rotates to press the spring buckle 410 to lock the relative displacement between the spring buckle 410 and the hook 310.

[0039] When the machine arm needs to be folded and stored, the movable locking member 320 is rotated to loosen it from the spring buckle 410, and the spring buckle 410 is pressed to disengage it from the hook 310, and the first folding member 100 and / or the second folding member 200 are bent around the machine arm rotation axis 110, and the first folding member 100 and the second folding member 200 are completely folded.

[0040] Exemplarily, the side of the hook 310 close to the spring buckle 410 is a wedge-shaped plane. When the first folding member 100 and / or the second folding member 200 are unfolded around the arm shaft 110, the spring buckle 410 approaches the hook 310 until they are in contact with each other, and at this time, the fastener under the spring buckle 410 moves along the wedge-shaped plane of the hook 310 until the spring buckle 410 is completely engaged with the hook 310.

[0041] This embodiment uses a combination of a spring buckle 410 and a hook 310 to achieve the connection and fixation between the first folding member 100 and the second folding member 200, and further cooperates with a movable locking member 320 to lock the clamping structure of the spring buckle 410 and the hook 310 to prevent the arm folding mechanism from loosening during use.

[0042] Exemplarily, the first folding member 100 or the second folding member 200 is used to connect the drone arm, and the second folding member 200 or the first folding member 100 is used to connect the drone body, blades or the drone arm.

[0043] Exemplarily, the movable locking member 320 is a knob structure. When the first folding member 100 and / or the second folding member 200 are unfolded around the arm rotation axis 110, the hook 310 is engaged with the spring buckle 410, and then the movable locking member 320 of the knob structure is screwed until the spring buckle 410 is pressed to complete the locking.

[0044] Example 2

[0045] This embodiment makes improvements based on the arm folding mechanism proposed in Embodiment 1.

[0046] The arm folding mechanism proposed in this embodiment includes a first folding member 100, a buckle assembly 300, a second folding member 200 and a snap assembly 400. The first folding member 100 is rotatably connected to one end of the second folding member 200 through an arm rotating shaft 110; the snap assembly 400 is arranged at one end of the second folding member 200 and on the opposite side of the arm rotating shaft 110, and a snap 410 is arranged on one side of the snap assembly 400 close to the first folding member 100; a fixed base 120 is arranged on the first folding member 100 and on the opposite side of the arm rotating shaft 110, and the buckle assembly 300 is fixed on the fixed base 120; the buckle assembly 300 includes a hook 310 and a movable locking member 320.

[0047] Furthermore, the buckle assembly 300 includes a buckle base 330, which is provided with a screw hole 331, and the movable locking member 320 is connected to the buckle base 330 through a gasket 321 and a locking screw 322 via the screw hole 331; the movable locking member 320 rotates around the locking screw 322 as a rotating axis; the hook 310 is arranged on the buckle base 330 and on the side close to the second folding member 200.

[0048] For example, Figure 2 The figure shows an exploded view of the buckle assembly of this embodiment.

[0049] In this embodiment, the movable locking member 320 rotates with the locking screw 322 as the rotation axis. When the first folding member 100 and / or the second folding member 200 are unfolded around the arm rotation axis 110, the hook 310 is engaged with the spring buckle 410, and the movable locking member 320 is rotated around the locking screw 322 to press the spring buckle 410, locking the engagement state of the hook 310 and the spring buckle 410, further eliminating the engagement gap when the spring buckle 410 and the hook 310 cooperate, and avoiding the problem of UAV flight vibration caused by the gap vacancy.

[0050] In an optional embodiment, a positioning hole 323 is opened at the bottom of one side of the movable locking member 320, and a positioning bead 324 is built into the positioning hole 323. The positioning bead 324 is connected to the bottom of the positioning hole 323 through an elastic element; when the hook 310 is engaged with the spring buckle 410, and the movable locking member 320 is rotated to a point where one side of the movable locking member 320 is above the spring buckle 410, the positioning bead 324 elastically abuts against the upper surface of the spring buckle 410.

[0051] For example, Figure 3 , which is a schematic diagram of the buckle assembly in a locked snap-fastening state, wherein the positioning bead 324 abuts against the upper surface of the snap-fastening 410 , specifically, against the upper surface of the snap-fastening extension 411 .

[0052] Exemplarily, the elastic element is a compression spring.

[0053] The positioning bead 324 in this embodiment is used to elastically abut the upper surface of the spring buckle 410 under the elastic force of the elastic element inside the positioning bead 324 when the movable locking member 320 rotates to the locking spring buckle state. At this time, under the action of the positioning bead 324, the spring buckle 410 and the hook 310 are tightly engaged, and the relative matching virtual position is eliminated, so that the first folding member 100, the buckle assembly 300 and the second folding member 200 are fixedly connected to form a stable overall structure.

[0054] In an optional embodiment, a limiting boss 332 is further provided on the buckle base 330 ; when the hook 310 is engaged with the spring buckle 410 and the movable locking member 320 is rotated to press the spring buckle 410 , the limiting boss 332 abuts against the side of the movable locking member 320 .

[0055] In this embodiment, the limiting boss 332 is used to limit the movable locking member 320 and limit the rotation angle of the movable locking member 320. Specifically, when the movable locking member 320 rotates to the locked snap button state, that is, when the movable locking member 320 rotates to press the snap button 410, the side of the movable locking member 320 and the limiting boss 332 conflict with each other, preventing the rotation range of the movable locking member 320 from exceeding the snap button 410 area, thereby preventing the loosening of the movable locking member 320 and the snap button 410, resulting in a serious problem of tripping and bombing, and effectively ensuring the safety of the aircraft state.

[0056] In an optional embodiment, a pin hole 333 is provided on the buckle base 330 and on the rotation path of the movable locking member 320; a pin 334 is built into the pin hole 333, and the pin 334 is connected to the bottom of the pin hole 333 through an elastic element; a buckle extension portion 411 is provided on one side of the snap buckle 410 close to the buckle assembly 300; when the mechanism is in a folded state, the pin 334 extends out of the pin hole 333 under the action of the elastic element, and the side of the pin 334 abuts against the side of the movable locking member 320; when the mechanism is in an unfolded state and the hook 310 is buckled with the snap buckle 410, the bottom of the snap buckle extension portion 411 abuts against the pin 334, and compresses the pin 334 downward into the pin hole 333.

[0057] For example, Figure 4 The figure shows a schematic diagram of the buckle assembly in a released buckle state.

[0058] In this embodiment, the ejector pin 334 is used to limit the movable locking member 320 when the snap-release state is released, so as to prevent the rotation of the movable locking member 320 from affecting the engagement of the hook 310 and the snap 410. Specifically, when the movable locking member 320 is in the snap-release state, the ejector pin 334 extends out of the ejector pin hole 333 under the elastic support of the elastic element. At this time, the ejector pin 334 acts as a limiter to limit the rotation range of the movable locking member 320, so as to prevent the movable locking member 320 from rotating to the hook 310 area. When the arm is in the unfolded state and the spring buckle 410 is engaged with the hook 310, the spring buckle extension 411 contacts the hook 310 and moves along the wedge-shaped structure at the front of the hook 310 until the fastener at the bottom of the spring buckle 410 is engaged with the hook 310. At this time, the spring buckle extension 411 abuts against the ejector pin 334 and squeezes the ejector pin 334 downward into the ejector pin hole 333. The movable locking piece 320 can then rotate to the top of the spring buckle 410 and press the spring buckle 410.

[0059] Example 3

[0060] This embodiment is improved on the basis of Embodiment 1 or Embodiment 2.

[0061] The arm folding mechanism proposed in this embodiment includes a first folding member 100, a buckle assembly 300, a second folding member 200 and a snap assembly 400. The first folding member 100 is rotatably connected to one end of the second folding member 200 through an arm rotating shaft 110; the snap assembly 400 is arranged at one end of the second folding member 200 and on the opposite side of the arm rotating shaft 110, and a snap 410 is arranged on one side of the snap assembly 400 close to the first folding member 100; a fixed base 120 is arranged on the first folding member 100 and on the opposite side of the arm rotating shaft 110, and the buckle assembly 300 is fixed on the fixed base 120; the buckle assembly 300 includes a hook 310 and a movable locking member 320.

[0062] Further optionally, the snap assembly 400 includes a snap 410, a snap base 420 and a compression spring 430. The snap base 420 is disposed at one end of the second folding member 200 and on the opposite side of the arm shaft 110, and the snap 410 is rotatably connected to the snap base 420 via a shaft; at least one compression spring 430 is connected between the snap 410 and the snap base 420.

[0063] For example, Figure 5 Shown is an exploded view of the snap assembly.

[0064] In this embodiment, the compression spring 430 disposed between the spring buckle 410 and the spring buckle base 420 is used to provide elastic force for the spring buckle 410. As the arm folding mechanism unfolds, the spring buckle 410 contacts the hook 310 and moves along the wedge-shaped plane in front of the hook 310, at which time one end of the spring buckle 410 rotates upward around the rotation axis under the support of the hook 310, and the other end of the spring buckle 410 rotates downward around the rotation axis, while squeezing the compression spring 430 until the fastener at the bottom of the spring buckle 410 reaches the matching position of the hook 310, at which time the compression spring 430 automatically pops up and resets, and the spring buckle 410 and the hook 310 are buckled.

[0065] Exemplarily, the spring buckle 410 rotates with the optical axis screw as a rotation axis.

[0066] In an optional embodiment, a first connecting hole 130 is provided at one end of the first folding member 100 close to the second folding member 200; a connecting portion 210 for rotationally connecting with the first folding member 100 is provided at one end of the second folding member 200, and second connecting holes 211 are provided on both sides of the connecting portion 210; after the end of the arm shaft 110 passes through the second connecting hole 211, it is fixedly connected to the first connecting hole 130 by a locking screw 322 to form a rotating pair.

[0067] For example, Figure 6 Shown is an exploded view of the arm folding mechanism.

[0068] In this embodiment, the first folding member 100 and the second folding member 200 are respectively provided with connection holes for connecting the machine arm rotating shaft 110. The snap base 420 is disposed on the connecting portion 210 and on the opposite side of the machine arm rotating shaft 110.

[0069] Exemplarily, the first folding member 100 is sleeved on the second folding member 200, and the first connection hole 130 overlaps with the second connection hole 211. Further, after the end of the arm shaft 110 passes through the second connection hole 211, it is fixedly connected to the first connection hole 130 by a locking screw 322 to form a rotation pair, thereby realizing the folding and unfolding function of the arm folding mechanism.

[0070] Further optionally, a lubricating copper sleeve 220 is provided on the inner wall of the first connecting hole 130 and / or the second connecting hole 211 , and the lubricating copper sleeve 220 is interference fit with the first connecting hole 130 and / or the second connecting hole 211 .

[0071] In this embodiment, a lubricating copper sleeve 220 is selected to be pressed into the first connecting hole 130 and / or the second connecting hole 211. The self-lubricating material property of the copper sleeve is utilized to fit with the arm shaft 110 in a clearance manner, so that a smooth rotating pair is formed between the first folding member 100 and the second folding member 200.

[0072] Example 4

[0073] This embodiment provides a folding arm of a drone, including an arm 500, wherein the arm 500 is connected to the arm folding mechanism as described in Embodiments 1 to 3.

[0074] Exemplarily, one end of the arm 500 is connected to the second folding part 200, and the other end of the arm 500 is connected to the UAV power system, UAV blades or UAV onboard equipment; and the first folding part 100 is connected to the UAV body as a fixed base.

[0075] like Figure 7 , which is a schematic diagram of the unfolded state of the folding arms of the drone of this embodiment.

[0076] It can be understood that the folding arm of the drone of this embodiment includes the arm folding mechanism described in the above embodiments 1 to 3, and the options in the above embodiment 1 are also applicable to this embodiment, so they will not be described again here.

[0077] Example 5

[0078] This embodiment provides a drone, including a drone body, wherein the drone body is connected to at least one arm folding mechanism as described in Embodiments 1 to 3.

[0079] It can be understood that the drone of this embodiment includes the arm folding mechanism described in the above embodiments 1 to 3, and the options in the above embodiment 1 are also applicable to this embodiment, so they will not be described again here.

[0080] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An arm folding mechanism, characterized in that: It comprises a first folding piece (100), a buckle assembly (300) and a second folding piece (200); wherein: The first folding member (100) is rotatably connected to one end of the second folding member (200) via an arm rotating shaft (110); A snap assembly (400) is provided at one end of the second folding member (200) and on the opposite side of the arm rotating shaft (110), and a snap assembly (410) is provided on one side of the snap assembly (400) close to the first folding member (100); A fixed base (120) is disposed on the first folding member (100) and on the opposite side of the machine arm rotating shaft (110), and the buckle assembly (300) is fixed on the fixed base (120); The buckle assembly (300) comprises a hook (310) and a movable locking member (320); when the first folding member (100) and / or the second folding member (200) are unfolded around the machine arm rotating shaft (110), the hook (310) is used to engage with the spring buckle (410), and the movable locking member (320) is rotated to press the spring buckle (410) to lock the relative displacement between the spring buckle (410) and the hook (310).

2. The arm folding mechanism according to claim 1, characterized in that: The buckle assembly (300) includes a buckle base (330), a screw hole (331) is provided on the buckle base (330), and the movable locking member (320) is connected to the buckle base (330) through the screw hole (331) via a gasket (321) and a locking screw (322); the movable locking member (320) rotates with the locking screw (322) as a rotating axis; the hook (310) is arranged on the buckle base (330) and on a side close to the second folding member (200).

3. The arm folding mechanism according to claim 2, characterized in that: A positioning hole (323) is provided at the bottom of one side of the movable locking member (320), and a positioning bead (324) is built into the positioning hole (323). The positioning bead (324) is connected to the bottom of the positioning hole (323) through an elastic element; when the hook (310) is engaged with the spring buckle (410), and the movable locking member (320) is rotated until one side of the movable locking member (320) is located above the spring buckle (410), the positioning bead (324) elastically abuts against the upper surface of the spring buckle (410).

4. The arm folding mechanism according to claim 2, characterized in that: A limiting boss (332) is also provided on the buckle base (330); when the hook (310) is buckled with the spring buckle (410) and the movable locking member (320) is rotated to press the spring buckle (410), the limiting boss (332) abuts against the side of the movable locking member (320).

5. The arm folding mechanism according to claim 2, characterized in that: A pin hole (333) is provided on the buckle base (330) and on the rotation path of the movable locking member (320); a pin (334) is built in the pin hole (333), and the pin (334) is connected to the bottom of the pin hole (333) through an elastic element; a pin extension portion (411) is provided on one side of the snap buckle (410) close to the buckle assembly (300); when the mechanism is in a folded state, the pin (334) is extended out of the pin hole (333) under the action of the elastic element, and the side of the pin (334) abuts against the side of the movable locking member (320); When the mechanism is in an unfolded state and the hook (310) is buckled with the spring buckle (410), the bottom of the spring buckle extension (411) abuts against the ejector pin (334) and compresses the ejector pin (334) downward into the ejector pin hole (333).

6. The machine arm folding mechanism according to any one of claims 1 to 5, characterized in that: The snap assembly (400) comprises a snap base (420), and the snap (410) is rotatably connected to the snap base (420) via a rotating shaft; at least one compression spring (430) is connected between the snap (410) and the snap base (420).

7. The machine arm folding mechanism according to any one of claims 1 to 5, characterized in that: A first connecting hole (130) is provided at one end of the first folding member (100) close to the second folding member (200); a connecting portion (210) for rotationally connecting with the first folding member (100) is provided at one end of the second folding member (200), and second connecting holes (211) are provided at both sides of the connecting portion (210); after the end of the arm shaft (110) passes through the second connecting hole (211), it is fixedly connected to the first connecting hole (130) by a locking screw (322) to form a rotating pair.

8. The machine arm folding mechanism according to claim 7, characterized in that: A lubricating copper sleeve (220) is provided on the inner wall of the first connecting hole (130) and / or the second connecting hole (211), and the lubricating copper sleeve (220) is interference-fitted with the first connecting hole (130) and / or the second connecting hole (211).

9. A folding arm of an unmanned aerial vehicle, comprising an arm, characterized in that: The machine arm is connected to the arm folding mechanism as described in any one of claims 1 to 8.

10. A drone, comprising a drone body, characterized in that: The drone body is connected to at least one arm folding mechanism as described in any one of claims 1 to 8.

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