Foldable drone arms, quadcopters and hexacopters

Abstract

The unmanned plane folding machine arm, four-rotor unmanned plane and six-rotor unmanned plane relate to the technical field of unmanned plane. In order to solve the technical problems that the existing unmanned plane folding machine arm locking structure needs to face the complicated operation of respectively and independently operating the first locking piece and the second locking piece at the same time, which leads to inconvenient operation, and because the stability of the locking piece cannot reach the best, which leads to the loosening of the locking piece and the damage of the unmanned plane caused by the folding of the machine arm, the technical scheme provided by the present application is that the unmanned plane folding machine arm comprises a fixed end, a movable end and a connecting device; the connecting device comprises a fixed base for connecting the fixed end of the unmanned plane folding machine arm, a movable base for connecting the movable end of the machine arm, and a locking wrench for locking the fixed base and the movable base; the locking wrench further comprises an extension piece which changes position when unlocked, so that the locking piece cannot fix its position. It is suitable for application in the design of unmanned plane.

Description

Technical Field

[0001] This relates to the field of drone technology, particularly drones with foldable arms. Background Technology

[0002] In today's society, with the application of drones in various industries and fields, people have become more and more aware of drones with increasingly diverse functions. From an overall appearance perspective, multi-rotor agricultural drones are mainly composed of components such as the fuselage, arms, rotors, and landing gear. At the same time, various functional modules are mounted under the fuselage, such as precision direct seeders, broadcasting devices, spraying and fertilizing devices, to meet the various needs of agricultural aviation for seeding, fertilizing, and spraying.

[0003] Currently, in the field of agricultural aviation, larger payload capacity or weight is more favored by users, as increased payload capacity improves the unit efficiency of agricultural operations. However, increasing payload capacity undoubtedly requires corresponding improvements to all aspects of the drone. This includes longer arms, increased battery capacity, more powerful rotor motors, and larger rotor sizes. In essence, the overall size of the drone becomes larger. Given that drones typically weigh 40-50 kg, this increased size creates inconvenience in routine operations such as packaging, transportation, operation, and handling.

[0004] The industry generally uses a folding arm mechanism to achieve foldable arms, which reduces the overall size of the drone after folding. In existing technologies, users usually only unfold the drone's arms before use, making it difficult to notice whether the arms are fully unfolded or locked after unfolding. However, starting the propellers when the arms are not fully unfolded or locked after unfolding can easily cause the arms to vibrate, leading to the arms coming loose, or even causing the drone to fall abnormally and be damaged, greatly reducing the safety of drone use.

[0005] The utility model patent with a publication date of May 7, 2021, and application number 202120352005.6, provided by Dongguan XAG UAV Technology Co., Ltd., describes a locking assembly and aircraft. The assembly includes a locking structure that can lock the aircraft arm in an extended state. The locking structure comprises a first locking member and a second locking member that can wrap around each other in a circular ring. The first locking member includes a push rod facing its fixed end. In the engaged state, the push rod pushes towards the connection between the first locking member and the aircraft arm. The end of the second locking member has a force-bearing structure. When the second locking member is fully depressed and the first locking member is fully engaged, the push rod, through the force-bearing structure, pushes the end of the second locking member towards the fixed end of the first locking member to its limit, ensuring full wrapping of the first and second locking members. In this state, the aircraft arm is locked in an extended state.

[0006] However, because the first and second locking components need to be operated independently, the actual operation of unfolding and folding the arm is cumbersome. Furthermore, the arm needs to be unfolded manually before locking, and the overall weight of the arm will put a burden on the operator. The cumbersome operation and the weight burden make the locking structure inconvenient to operate.

[0007] The patent application No. 202022577797.5, published on November 9, 2021, is a folding arm and drone provided by Shenzhen DJI Innovations Technology Co., Ltd. It includes an arm body that can switch between an unfolded and folded position. The arm body comprises a first body and a second body, which are locked together using a first locking component and a second locking component that cooperate with each other. Based on the images and text, the locking mechanism involves a diagonal bracing structure that works together and restrains the first and second locking components. With the length of the diagonal bracing structure remaining constant, when the first locking component is engaged, it pushes the end of the diagonal bracing structure connected to the second locking component towards the fixed end of the first locking component. When the second locking component moves towards the fixed end of the first locking component under the pushing force, it creates a negative angle resistance with the diagonal bracing structure, thus achieving locking.

[0008] Although the technical solution sets the locking component as an integrated structure, its interference fit requires high machining precision. Furthermore, when faced with sudden airflow or large vibrations caused by the drone turning, the interference fit locking component may still loosen, leading to the folding of the arm and damage to the drone. Summary of the Invention

[0009] To address the existing technical problems in the locking structure of folding drone arms, which simultaneously presents the challenges of: cumbersome operation of the first and second locking components, the weight burden of the drone arm making operation inconvenient; and the instability of the locking components leading to loosening and damage to the drone due to arm folding, the present invention provides the following technical solution:

[0010] A folding arm for a drone, characterized in that the arm comprises:

[0011] A fixed end, a movable end, and a connecting device for connecting the fixed end and the movable end;

[0012] The connecting device includes:

[0013] Locking joint, the locking joint comprising:

[0014] A mounting base for connecting the fixed end of a drone's folding arm.

[0015] Movable base for connecting the movable end of the machine arm

[0016] and a locking wrench for locking the fixed base and the movable base;

[0017] The fixed base is provided with a large rotating shaft, and the fixed base is movably connected to the movable base through the large rotating shaft.

[0018] The fixing base is also provided with a groove.

[0019] The locking wrench is movably connected to the movable base via a small rotating shaft.

[0020] The locking wrench is equipped with a locking element.

[0021] The locking member is driven by the locking wrench and falls into the groove, so that the joint is in a locked state;

[0022] The locking element is a roller.

[0023] On a plane perpendicular to the axis of the roller, the angle between the line connecting the centers of the two circles in which the projections of the roller and the small shaft lie and the line connecting the centers of the two circles in which the projections of the roller and the large shaft lie is not less than 90 degrees.

[0024] The locking wrench also includes:

[0025] Expansion joints;

[0026] The locking element is used to fix the position between the telescopic element and the main body when locked;

[0027] The telescopic component is slidably connected to the movable base, and the telescopic component has a recess. When locked, the recess coincides with the concave surface of the groove. When unlocked, the telescopic component changes its relative position with the movable base, making it impossible for the locking component to fix its position.

[0028] Furthermore, a preferred embodiment is provided in which the projection of the fixed base onto the plane is a right trapezoid, and the large rotating shaft is positioned close to the interior angle of the trapezoid with the smallest angle.

[0029] Furthermore, a preferred embodiment is provided in which the locking wrench is positioned such that, when the joint is in the locked state, the movable base is located on the side wall away from the large rotating shaft.

[0030] Furthermore, in a preferred embodiment, the locking wrench is provided with a fixing buckle, and when the joint is in the locked state, the locking wrench is fixedly connected to the movable base through the fixing buckle.

[0031] Furthermore, in a preferred embodiment, the locking wrench is further provided with a trigger, which is used to release the locking wrench and the movable base that are fixedly connected when triggered.

[0032] Furthermore, in a preferred embodiment, the locking wrench is also provided with a fixed shaft for connecting the trigger and the fixed buckle to the locking wrench, wherein the trigger, the fixed buckle and the fixed shaft are the three ends of a T-shaped structure.

[0033] Furthermore, a preferred embodiment is provided in which a torsion spring coaxial with the small rotating shaft is provided at the small rotating shaft, the fixed end of the torsion spring is connected to the machine arm, and the outer side of the movable end contacts the locking member.

[0034] Furthermore, a preferred embodiment is provided in which the telescopic member is provided with a large spring, the fixed end of the large spring being connected to the locking wrench and used to push the telescopic member when unlocking, so that the groove is moved away from the locking member.

[0035] Based on the same inventive concept, the drone includes four arms, which are described above, and the folding direction of the arms is along the horizontal plane where the drone body is located.

[0036] Based on the same inventive concept, the present invention also provides a six-rotor drone, the drone comprising six arms, wherein four of the arms are folded along the horizontal plane of the drone fuselage, and the other two arms are folded vertically downwards.

[0037] Compared with the prior art, the advantages of the technical solution provided by the present invention are as follows:

[0038] The drone provided by this invention provides an easy-to-operate locking method through an integrated locking wrench design. Furthermore, through the trigger structure on the wrench, when the wrench falls to its extreme position, the wrench position can be self-locked by the trigger latch, achieving a stable locking state.

[0039] The drone provided by this invention has a trigger for achieving a stable locking state located inside the wrench surround, which avoids the problem of unstable locking structure caused by impact with the trigger, resulting in loosening of the locking parts and damage to the drone.

[0040] The drone provided by this invention sets the inherent fixed clamping component as a rotatable roller, transforming sliding friction into rolling friction. This improves the smoothness of the clamping process, reduces the resistance during clamping and the wear of the clamping component caused by friction, and increases the service life of the clamping component. Furthermore, the smooth transition makes the clamping component easier to operate.

[0041] The drone provided by this invention, through the movement of the telescopic component, ensures that the wrench cannot fall to its limit position when the arm is folded. Therefore, the trigger latch cannot engage with the slot that provides a self-locking function, and the roller position will not be fixed by the locked trigger. During the process of unfolding the folded arm, the roller will not be damaged due to the impact between the arm and the fixed roller.

[0042] The drone provided by this invention features a lever positioned opposite to the folding direction of the arm. This lever is a trigger mechanism that unlocks the drone by hooking it with a hand. In contrast, the arms of a hexacopter drone, which typically require downward-folding arms, fold abruptly downwards after unlocking because the arm's movement due to gravity is opposite to the direction of hand force. This downward folding can lead to over-folding due to the arm's inertia, potentially causing an impact. However, by designing the lever at the upper part of the arm, where it hooks upwards to unlock, the upward pulling force counteracts the arm's own weight, creating an ergonomic design that improves user experience and extends product lifespan by preventing impacts.

[0043] The drone provided by this invention, through the locking device set on the folding arm, allows the wiring inside the folding joint to be directly exposed when the drone arm is in the folded state, which facilitates the maintenance and repair of the wiring.

[0044] Suitable for use in drone design. Attached Figure Description

[0045] Figure 1 This is a front view of the quadcopter drone with its arms deployed, as described in Implementation Method Nine.

[0046] Figure 2 This is a top view of the quadcopter drone with its arms extended, as described in Implementation Method Nine.

[0047] Figure 3 This is a front view of the quadcopter drone with its arms folded, as described in Implementation Method Nine.

[0048] Figure 4 This is a top view of the quadcopter drone with its arms folded, as described in Implementation Method Nine.

[0049] Figure 5 for Figure 1 A perspective view of the connecting device in the middle;

[0050] Figure 6 for Figure 5 A side view of the locked state;

[0051] Figure 7 for Figure 5 Side view of the unlocked state;

[0052] Figure 8 for Figure 5 Side view of the locking wrench in the raised position;

[0053] Figure 9 for Figure 1 A 3D diagram showing the locking position of the center locking wrench;

[0054] Figure 10 for Figure 1 Side view;

[0055] Figure 11 for Figure 1 Cross-sectional view;

[0056] Figure 12 for Figure 1 Side view in the unlocked state;

[0057] Figure 13 for Figure 12 Cross-sectional view;

[0058] Figure 14 for Figure 9 Side view of the locking wrench in the raised position;

[0059] Figure 15 for Figure 14 Cross-sectional view;

[0060] In this diagram, 1 represents a fixed base, 11 represents a large rotating shaft, 12 represents a groove, 2 represents a movable base, 3 represents a locking wrench, 31 represents a small rotating shaft, 32 represents a locking component, 33 represents a fixed buckle, 34 represents a trigger, 35 represents a torsion spring, 36 represents a small spring, 4 represents a telescopic component, and 41 represents a large spring. Detailed Implementation

[0061] To make the advantages and benefits of the technical solution provided by the present invention clearer, the technical solution provided by the present invention will now be described in further detail with reference to the accompanying drawings, specifically:

[0062] Implementation Method 1: This implementation method provides a folding arm for a drone, the arm comprising:

[0063] A fixed end, a movable end, and a connecting device for connecting the fixed end and the movable end;

[0064] The connecting device includes:

[0065] Locking joint, the locking joint comprising:

[0066] Fixing base 1 for connecting the fixed end of the folding arm of a drone.

[0067] Movable base 2 for connecting the movable end of the machine arm

[0068] and a locking wrench 3 for locking the fixed base 1 and the movable base 2;

[0069] The fixed base 1 is provided with a large rotating shaft 11, and the fixed base 1 is movably connected to the movable base 2 through the large rotating shaft 11.

[0070] The fixed base 1 is also provided with a groove 12.

[0071] The locking wrench 3 is movably connected to the movable base 2 via a small rotating shaft 31.

[0072] The locking wrench 3 is equipped with a locking element 32.

[0073] The locking member 32 is driven by the locking wrench 3 and falls into the groove 12, so that the joint is in a locked state;

[0074] The locking element 32 is a roller.

[0075] On a plane perpendicular to the axis of the roller, the angle between the line connecting the centers of the two circles in which the projections of the roller and the small shaft 31 lie and the line connecting the centers of the two circles in which the projections of the roller and the large shaft 11 lie is not less than 90 degrees.

[0076] The locking wrench 3 also includes:

[0077] Telescopic component 4;

[0078] The locking member 32 is used to fix the position between the telescopic member 4 and the main body when locked;

[0079] The telescopic member 4 is slidably connected to the movable base 2, and the telescopic member 4 is provided with a recess. When locked, the recess coincides with the concave surface of the groove 12. When unlocked, the telescopic member 4 changes its relative position with the movable base 2, so that the locking member 32 cannot fix its position.

[0080] In the prior art, in the design of the unfolding of the folding arm of a drone, people usually choose a fixed, heavy casting that is not easily deformed and has extremely high stability as the locking part 32 in order to ensure the stability of the unfolding. The larger locking part 32 provides a more stable and reliable locking ability and improves the sense of security.

[0081] However, it overlooks the fact that because of its relatively greater friction during operation, the wear of the locking parts is more severe, and because of its greater friction, more force is required to operate the locking parts to lock and unlock in actual use.

[0082] The connecting device provided in this embodiment achieves the following effect:

[0083] In the locking state, the connecting device provided in this embodiment has a straight line a connecting the arm locking member 32 and the small rotating shaft 31, and a line b connecting the midpoint of the axis of the large rotating shaft 11 of the joint and the locking member 32. Through a specific structural relationship, the included angle between the straight line a and the line b is fixed to not less than 90 degrees. In this way, in the locking state, due to the intersecting relationship between the mutual movement paths of the fixed base 1 and the movable base 2, the force direction between the locking member 32 and the groove 12, and between the groove 12 and the locking member 32, is perpendicular to the tangent of the contact surface and towards the roller axis. There is no angular deviation, so the roller will not rotate when subjected to force. Thus, the stability effect of fixing the casting is achieved by the non-rotating roller.

[0084] Based on achieving a stable effect, due to the design of the roller, in the non-locked state, due to the angular deviation, the interaction between the locking part 32 and the groove 12 changes from sliding friction of the fixed casting to rolling friction, which improves the service life of the locking part 32, provides a smooth transition for the interaction, and achieves a faster and more effortless locking and unlocking effect.

[0085] The connecting device provided in this embodiment provides an easy-to-operate locking method through the integrated locking wrench 3, and through the trigger 34 structure on the wrench, the wrench position is self-locked by the fixing buckle 33 when the wrench falls to the lowest position, thus achieving a stable locking state.

[0086] By setting the inherent fixed clamping component as a rotatable roller, sliding friction is converted into rolling friction, which improves the smoothness of the clamping process of the locking component 32, reduces the resistance of the clamping process and the wear of the locking component 32 caused by friction, and increases the service life of the locking component 32. Moreover, the smooth transition process makes the locking component 32 easier to operate.

[0087] By moving the locking slider, the wrench cannot fall to its limit position when the arm is folded. Therefore, the wrench's locking buckle 33 cannot be engaged in the slot that provides the self-locking function. During the process of unfolding the folded arm, the locking wrench will not lock the roller, and the arm and the immovable roller will not collide and damage the roller.

[0088] Implementation Method 2: This implementation method further defines the folding arm of the drone provided in Implementation Method 1. The projection of the fixed base 1 on the plane is a right trapezoid, and the large rotating shaft 11 is located close to the interior angle of the trapezoid with the smallest angle.

[0089] Implementation Method 3: This implementation method further defines the folding arm of the drone provided in Implementation Method 2. The locking wrench 3 is positioned such that when the joint is in the locked state, the movable base 2 is on the side wall away from the large rotating shaft 11.

[0090] Implementation Method 4: This implementation method further defines the folding arm of the drone provided in Implementation Method 3. The locking wrench 3 is provided with a fixing buckle 33. When the joint is in the locked state, the locking wrench 3 is fixedly connected to the movable base 2 through the fixing buckle 33.

[0091] When the joint is locked, the locking wrench 3 drives the locking member 32 to lock the fixed base 1 and the movable base 2. After the locking wrench 3 falls to the lowest point, the fixing buckle 33 on the locking wrench 3 can cooperate with the fixing groove buckle fixed on the movable base 2 to further lock the locking wrench 3. This prevents the wrench from being lifted up due to external forces such as impact, which would cause the locking to lose its effectiveness and the arm to fold, resulting in damage.

[0092] Implementation Method 5: This implementation method further defines the folding arm of the drone provided in Implementation Method 4. The locking wrench 3 is also provided with a trigger 34, which is used to release the locking wrench 3 and the movable base 2 that are fixedly connected when triggered.

[0093] A trigger 34 is provided for releasing the latch engagement state. The trigger 34 and the fixed latch 33 are integrated into one structure and are fixed to the locking wrench 3 by the latch pivot. The fixed latch 33 is released by triggering the trigger 34, which reduces the difficulty of operation and further improves the ease of operation.

[0094] Meanwhile, the locking wrench 3 is provided with a through hole for surrounding the trigger 34.

[0095] By encircling the trigger 34 inside the locking wrench 3, accidental activation of the trigger 34 due to impacts or other factors is prevented, which could lead to the loosening of the locking engagement, the lifting of the locking wrench 3, and the loss of the locking effect of the joint. This improves the stability of the joint and reduces the risk of damage.

[0096] Implementation Method Six: This implementation method further defines the folding arm of the drone provided in Implementation Method Five. The locking wrench 3 is also provided with a fixed shaft for connecting the trigger 34 and the fixed buckle 33 to the locking wrench 3. The trigger 34, the fixed buckle 33 and the fixed shaft are the three ends of the T-shaped structure.

[0097] Implementation Method Seven: This implementation method further defines the folding arm of the drone provided in Implementation Method One. A torsion spring 35 coaxial with the small rotating shaft 31 is provided at the small rotating shaft 31. The fixed end of the torsion spring 35 is connected to the arm, and the outer side of the movable end contacts the locking member 32.

[0098] In this embodiment, the locking wrench is elongated, with one end movably connected to the movable base 2 via a torsion spring 35. The locking wrench has an elongated, arc-shaped through hole for accommodating the locking member 32 and providing space for its movement. Providing this space for the locking member 32 ensures smoother operation and reduces resistance. The torsion spring 35 ensures the locking member 32 remains pressed down, preventing loosening due to improper positioning.

[0099] Implementation Method 8: This implementation method is a further limitation of the folding arm of the drone provided in Implementation Method 1. The telescopic member 4 is provided with a large spring 41. The fixed end of the large spring 41 is connected to the locking wrench 3 and is used to push the telescopic member 4 when unlocking, so that the groove 12 is away from the locking member 32.

[0100] Implementation Method Nine: This implementation method provides a quadcopter drone, which includes four arms. The arms are the same as those provided in Implementation Method One, and the folding direction of the arms is along the horizontal plane where the drone body is located.

[0101] Specifically,

[0102] The locking wrench 3 is fastened to the movable base 2 of the machine arm. The fixed base 1 of the machine arm is provided with a groove 12. When the machine arm is extended, the groove 12 on the fixed base 1 corresponds to the locking position of the locking member 32. The locking is achieved by pressing the locking member 32 to lock the machine arm in the extended state. The integrated locking wrench 3 provides an easy-to-operate locking method. Moreover, through the trigger 34 structure on the wrench, when the wrench falls to the extreme position, the wrench position can be self-locked by the fixed buckle 33 to achieve a stable locking state.

[0103] When the movable end is extended and coaxial with the fixed end (arm extended), the telescopic member 4 is pushed by the fixed base 1 and moves towards the trigger 34. The recess on it corresponds to the locking member 32, and the locking member 32 can fall into the recess, so that the locking wrench 3 can descend to the lowest point. The fixed buckle 33 can only hook on the movable base 2 when the locking wrench 3 descends to the lowest point, so that the locking member 32 is pressed tightly and does not loosen. At this time, the part pressed by the locking member 32 includes the recess on the telescopic member 4 and the groove 12 on the fixed base 1.

[0104] When the movable end is in a free state (arm folded), the telescopic member 4 loses the push of the fixed end and is displaced by the thrust of the large spring 41, causing the recess on it to move away from the locking member 32. The locking member 32 cannot fall into the recess, the locking wrench 3 cannot descend to the lowest point, and the fixing buckle 33 of the wrench cannot hook onto the arm. Its advantage is that the locking wrench 3, which is not fixed by the fixing buckle 33, can move arbitrarily, that is, it can be raised or pressed down at any time. Therefore, in the process of moving the movable base 2 in a free state to a position coaxial with the fixed base 1, because the two sides of the groove 12 are protruding structures, the locking wrench 3 will be raised to a certain height before the locking member 32 falls into the groove 12. The locking wrench 3, which is not fixed by the locking end, can be raised directly without any burden and then fall down.

[0105] However, without this function, when the locking wrench 3 is lifted to a certain height before the locking member 32 falls into the groove 12, the locking wrench 3 will not be lifted because the locking end is fixed, which will make it impossible to extend the arm in a portable manner or damage the drone locking member 32 due to the relative force between the locking wrench 3 and the locking member 32 that cannot be lifted.

[0106] Implementation Method 10: This implementation method provides a six-rotor drone, which includes six arms. The arms are the same as those provided in Implementation Method 1, wherein four of the arms are folded along the horizontal plane of the drone's fuselage, and the other two arms are folded vertically downwards.

[0107] The above description of several specific embodiments further details the technical solution provided by the present invention in order to highlight the advantages and benefits of the technical solution provided by the present invention. However, the above-described specific embodiments are not intended to limit the present invention. Any reasonable modifications and improvements to the present invention, reasonable combinations and equivalent substitutions of the embodiments based on the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A folding arm for a drone, characterized in that, The robotic arm includes: A fixed end, a movable end, and a connecting device for connecting the fixed end and the movable end; The connecting device includes: Locking joint, the locking joint comprising: A mounting base for connecting the fixed end of a drone's folding arm. Movable base for connecting the movable end of the machine arm and a locking wrench for locking the fixed base and the movable base; The fixed base is provided with a large rotating shaft, and the fixed base is movably connected to the movable base through the large rotating shaft. The fixing base is also provided with a groove. The locking wrench is movably connected to the movable base via a small rotating shaft. The locking wrench is equipped with a locking element. The locking member is driven by the locking wrench and falls into the groove, so that the locking joint is in a locked state; The locking element is a roller. On a plane perpendicular to the axis of the roller, the angle between the line connecting the centers of the two circles in which the projections of the roller and the small shaft lie and the line connecting the centers of the two circles in which the projections of the roller and the large shaft lie is not less than 90 degrees. The locking wrench also includes: Expansion joints; The locking element is used to fix the position between the telescopic element and the locking wrench when locked; The telescopic component is slidably connected to the movable base and has a recess. When locked, the recess coincides with the concave surface of the groove. When unlocked, the telescopic component changes its relative position with the movable base, making it impossible for the locking component to fix its position.

2. The folding arm of the unmanned aerial vehicle according to claim 1, characterized in that, The projection of the fixed base onto the plane is a right trapezoid, and the large rotating shaft is positioned close to the interior angle of the trapezoid with the smallest angle.

3. The folding arm of the unmanned aerial vehicle according to claim 2, characterized in that, The locking wrench is positioned such that, when the locking joint is in the locked state, it is located on the side wall of the movable base away from the large rotating shaft.

4. The folding arm of the unmanned aerial vehicle according to claim 1, characterized in that, The locking wrench is provided with a fixing buckle. When the locking joint is in the locked state, the locking wrench is fixedly connected to the movable base through the fixing buckle.

5. The folding arm of the unmanned aerial vehicle according to claim 4, characterized in that, The locking wrench is also equipped with a trigger, which is used to release the locking wrench and the movable base that are fixedly connected when triggered.

6. The folding arm of the unmanned aerial vehicle according to claim 5, characterized in that, The locking wrench is also provided with a fixed shaft for connecting the trigger and the fixed buckle to the locking wrench. The trigger, the fixed buckle and the fixed shaft are the three ends of the T-shaped structure.

7. The folding arm of the unmanned aerial vehicle according to claim 1, characterized in that, A torsion spring coaxial with the small rotating shaft is provided at the small rotating shaft. The fixed end of the torsion spring is connected to the machine arm, and the outer side of the movable end contacts the locking member.

8. The folding arm of the unmanned aerial vehicle according to claim 1, characterized in that, The telescopic member is provided with a large spring, the fixed end of which is connected to the locking wrench and is used to push the telescopic member when unlocking, so that the groove moves away from the locking member.

9. A quadcopter drone, characterized in that, The drone includes four arms, which are the arms as described in claim 1, and the folding direction of the arms is along the horizontal plane where the drone body is located.

10. A hexacopter unmanned aerial vehicle, characterized in that: The drone includes six arms, which are the arms described in claim 1, wherein four of the arms are folded along the horizontal plane of the drone body, and the other two arms are folded vertically downwards.

Images