Unmanned aerial vehicle arm connecting structure and unmanned aerial vehicle

Abstract

The invention provides an unmanned aerial vehicle arm connecting structure and an unmanned aerial vehicle. The unmanned aerial vehicle arm connecting structure comprises a first arm, a second arm, a locking assembly and an adapter. One end of the first arm is connected with a fuselage of the unmanned aerial vehicle, a first connecting groove and a second connecting groove are formed in the inner wall of the other end of the first arm in the axis direction, and the first connecting groove is longer than the second connecting groove; a connecting convex strip is arranged on the outer wall of the second vehicle arm in the axis direction and used for being inserted into the first connecting groove or the second connecting groove, and the end, away from the connecting convex strip, of the second vehicle arm is used for being connected with a wing; the locking assembly comprises a first connecting piece and a second connecting piece, one of the first connecting piece and the second connecting piece is located on the first vehicle arm, the other one is located on the second vehicle arm, and the first connecting piece and the second connecting piece are detachably connected; and the adapter is used for sleeving the connecting convex strip when the connecting convex strip is inserted into the second connecting groove, and is connected with the first connecting piece and the second connecting piece respectively. According to the unmanned aerial vehicle arm connecting structure, the length of the unmanned aerial vehicle arm can be freely switched in different weather environments, so that the unmanned aerial vehicle arm connecting structure can adapt to different weather environments, the wind resistance and flexibility of an unmanned aerial vehicle in the flying process are improved, and then the unmanned aerial vehicle can be conveniently controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of unmanned aerial vehicles, and in particular to an unmanned aerial vehicle arm connection structure and a unmanned aerial vehicle. Background Art

[0002] With the continuous development of modern control and artificial intelligence technologies, drones are increasingly used in industrial production, military, agriculture and other fields, and the types and styles of drones are also showing a trend of diversification. As an important part of the drone system, rotary-wing drones have the characteristics of maneuverability and hovering flight. In actual use, rotary-wing drones need to operate in various severe weather conditions, such as strong winds.

[0003] Due to the structural limitations of the arms, the rotorcraft UAVs in the prior art have poor adaptability to weather conditions, resulting in the problem of not being able to balance wind resistance and flexibility when operating in windy weather, making them difficult to control. Summary of the invention

[0004] In view of this, the present invention proposes a UAV arm connection structure and a UAV to solve the technical problem that when operating in windy weather, there is a problem that wind resistance and flexibility cannot be taken into account, and it is difficult to control it.

[0005] The technical solution of the present invention is achieved in this way:

[0006] In a first aspect, the present invention provides a drone arm connection structure, comprising a first arm, a second arm, a locking assembly and an adapter, wherein:

[0007] One end of the first arm is connected to the fuselage of the drone, and the inner wall of the other end is provided with a first connecting groove and a second connecting groove along the axial direction, and the length of the first connecting groove is greater than the length of the second connecting groove;

[0008] The outer wall of the second machine arm is provided with a connecting ridge along the axial direction, the connecting ridge is used to be plugged into the first connecting groove or the second connecting groove, and one end of the second machine arm away from the connecting ridge is used to be connected to the wing;

[0009] The locking assembly comprises a first connecting member and a second connecting member, one of the first connecting member and the second connecting member is located on the first machine arm, and the other is located on the second machine arm, and the first connecting member and the second connecting member are detachably connected;

[0010] The adapter is used to be sleeved on the connecting convex strip when the connecting convex strip is inserted into the second connecting groove, and is used to connect the first connecting piece and the second connecting piece respectively.

[0011] Based on the above technical solutions, preferably, the first connecting member includes a first elastic rod and a first limiting block. The first elastic rod can be pressed in a direction close to the axis of the first arm, and the first limiting block is located on the side of the first elastic rod away from the axis of the first arm. The second connecting member is a cuboid with an open side to form a first chamber for accommodating the first elastic rod. A first limiting groove is provided in the first chamber, and the first limiting block can bounce into the first limiting groove under the restoring force of the first elastic rod.

[0012] Based on the above technical solutions, preferably, a guiding inclined surface is provided at one end of the first limiting block close to the first limiting groove.

[0013] Based on the above technical solutions, preferably, a limiting surface is provided at one end of the first limiting block away from the guiding inclined surface, and the limiting surface abuts against the side wall of the first limiting groove.

[0014] Based on the above technical solutions, preferably, the adapter includes a connecting cylinder, a third connecting member, and a fourth connecting member. A third connecting groove is provided through the inner wall of the connecting cylinder along the axial direction, and the connecting rib is inserted into the third connecting groove. The third connecting member and the fourth connecting member are respectively arranged at both ends of the connecting cylinder. The third connecting member connects the first connecting member, and the fourth connecting member connects the second connecting member.

[0015] Based on the above technical solutions, preferably, there are two groups of the first limiting grooves, with at least one in each group. The included angle between two adjacent first limiting grooves is 90 degrees, and the included angle between the central axes of the first connecting groove and the second connecting groove is 90 degrees.

[0016] When the limiting rib is connected to the first connecting groove, the first limiting block is connected to one of the groups of the first limiting grooves.

[0017] When the limiting rib is connected to the second connecting groove, the third connecting member is connected to the first limiting block, and the fourth connecting member is connected to the other group of the first limiting grooves.

[0018] Based on the above technical solutions, preferably, the fourth connecting member includes a second elastic rod and a second limiting block. The included angle between the second elastic rod and the first elastic rod is 90 degrees. The second elastic rod can be pressed in a direction close to the axis of the first arm. The second limiting block is located on the side of the second elastic rod away from the axis of the first arm. The third connecting member is a cuboid with an open side to form a second chamber for accommodating the second elastic rod. A second limiting groove is provided in the second chamber. The second limiting block can bounce up into the second limiting groove under the restoring force of the second elastic rod.

[0019] Based on the above technical solutions, preferably, the maximum adjustment distance of the length of the drone arm connection structure is the difference between the length of the first connection groove and the length of the second connection groove.

[0020] Based on the above technical solutions, preferably, there are two first connection grooves, two second connection grooves, and two connection ridges. The included angle between the two first connection grooves is 180 degrees, the included angle between the two second connection grooves is 180 degrees, and the included angle between the two connection ridges is 180 degrees. The two connection ridges are used to insert into the two first connection grooves or the two second connection grooves.

[0021] In a second aspect, the present invention provides a drone, including a fuselage and a plurality of drone arm connection structures as described in the first aspect. A plurality of the first arms are evenly installed on the fuselage.

[0022] The drone arm connection structure and the drone of the present invention have the following beneficial effects compared with the prior art:

[0023] (1) When it is necessary to switch to the short arm state, the connection ridge is inserted into the first connection groove, and the first connecting member and the second connecting member are connected to realize the connection and locking of the first arm and the second arm. When it is necessary to switch to the long arm state, the connection ridge is inserted into the second connection groove, the adapter sleeve is sleeved on the connection ridge, and both ends are respectively connected to the first connecting member and the second connecting member. Through the above structure, the drone arm can freely switch the length of the arm in different weather environments, so as to adapt to different weather environments, improve the wind resistance and flexibility of the drone during flight, and thus facilitate the control of the drone.

[0024] (2) Press it in the direction close to the axis of the first arm through the first elastic rod. The connecting rib slides along the first connecting groove, driving the first elastic rod to slide into the first chamber. When the first limiting block reaches the position of the first limiting groove, the first limiting block bounces up into the first limiting groove under the restoring force of the first elastic rod, thereby realizing the detachable connection between the first connecting member and the second connecting member. This connection structure is relatively convenient and fast, facilitating the quick installation and disassembly of the first arm and the second arm;

[0025] (3) Since a guiding inclined surface is provided at one end of the first limiting block close to the first limiting groove, under the guiding action of the guiding inclined surface, it is convenient for the first elastic rod to be inserted into the first chamber. After inserting the end of the guiding inclined surface into the first chamber, the pressure on the first elastic rod can be stopped. When the first limiting block reaches the position of the first limiting groove, the first elastic rod automatically rebounds, improving the convenience of the device;

[0026] (4) Since a limiting surface is provided at one end of the first limiting block away from the guiding inclined surface, and the limiting surface abuts against the side wall of the first limiting groove. When the first limiting block enters the first limiting groove, the top surface abuts against the bottom of the first limiting groove, and the side surface is limited by the side wall of the first limiting groove. Without applying external force to the first elastic rod, the first limiting block will not slide out of the first limiting groove, improving the reliability and stability of the device;

[0027] (5) Since there are two groups of the first limiting grooves, and the included angle between two adjacent first limiting grooves is 90 degrees, and the included angle between the central axes of the first connecting groove and the second connecting groove is 90 degrees. When the limiting rib is connected to the first connecting groove, the first limiting block is connected to one group of the first limiting grooves; when the limiting rib is connected to the second connecting groove, the third connecting member is connected to the first limiting block, and the fourth connecting member is connected to the other group of the first limiting grooves; enabling the first connecting member to be connected to the second connecting member or the third connecting member, realizing the adjustment of the length of the drone arm;

[0028] (6) Since there are two first connecting grooves, two second connecting grooves, and two connecting ribs, the included angle between the two first connecting grooves is 180 degrees, the included angle between the two second connecting grooves is 180 degrees, and the included angle between the two connecting ribs is 180 degrees. The two connecting ribs are used to insert into the two first connecting grooves or the two second connecting grooves, so that the forces on the first arm and the second arm are symmetric and uniform after being inserted, and can better resist the torque received by the drone arm, improving the reliability of the device. Description of the Drawings

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the attached drawings required in the description of the embodiments or the prior art. Obviously, the attached drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other attached drawings can be obtained based on these attached drawings.

[0030] Figure 1 Stereogram of the drone arm connection structure (long arm state) in the embodiment of the present invention;

[0031] Figure 2 Exploded view of the drone arm connection structure (long arm state) in the embodiment of the present invention;

[0032] Figure 3 Cross-sectional view of the drone arm connection structure (long arm state) in the embodiment of the present invention;

[0033] Figure 4 For the embodiment of the present invention Figure 3 Partial enlarged view of part A in the embodiment;

[0034] Figure 5 For the embodiment of the present invention Figure 3 Partial cross-sectional view of B-B in the embodiment;

[0035] Figure 6 Stereogram of the first arm in the embodiment of the present invention;

[0036] Figure 7 Cross-sectional view of the first arm in the embodiment of the present invention;

[0037] Figure 8 Stereogram of the second arm in the embodiment of the present invention;

[0038] Figure 9 Stereogram of the adapter in the embodiment of the present invention;

[0039] Figure 10 Stereogram of the drone arm connection structure (short arm state) in the embodiment of the present invention;

[0040] Figure 11 Exploded view of the drone arm connection structure (short arm state) in the embodiment of the present invention;

[0041] Figure 12 Schematic structural diagram of the drone in the embodiment of the present invention.

[0042] Explanation of reference numerals: 1 - first arm, 2 - second arm, 3 - locking assembly, 4 - adapter;

[0043] 100 - fuselage, 200 - wing;

[0044] 11 - First connection groove, 12 - Second connection groove;

[0045] 21 - Connection rib;

[0046] 31 - First connector, 311 - First elastic rod, 312 - First limiting block, 3121 - Guide inclined surface, 3122 - Limiting surface, 32 - Second connector, 321 - First chamber, 322 - First limiting groove;

[0047] 41 - Connection cylinder, 411 - Third connection groove, 42 - Third connector, 421 - Second chamber, 422 - Second limiting groove, 43 - Fourth connector, 431 - Second elastic rod, 432 - Second limiting block. Specific embodiments

[0048] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0049] Referring to Figures 1-12 As shown, in the first - aspect embodiment of the present invention, a drone arm connection structure is proposed, including a first arm 1, a second arm 2, a locking assembly 3, and an adapter 4, wherein:

[0050] The first arm 1 is cylindrical. One end of the first arm 1 is connected to the fuselage 100 of the drone, and on the inner wall of the other end along the axial direction, there are a first connection groove 11 and a second connection groove 12. The length of the first connection groove 11 is greater than the length of the second connection groove 12. The starting points of the first connection groove 11 and the second connection groove 12 are both located on the end face of the first arm 1 far from the fuselage 100, and the end points are different. The first connection groove 11 and the second connection groove 12 are arranged in parallel;

[0051] The second arm 2 is cylindrical. On the outer wall of the second arm 2 along the axial direction, there is a connection rib 21. The connection rib 21 is used for plugging into the first connection groove 11 or the second connection groove 12. The end of the second arm 2 far from the connection rib 21 is used for connecting the wing 200. The length of the connection rib 21 can be equal to the length of the first connection groove 11;

[0052] The locking assembly 3 includes a first connecting member 31 and a second connecting member 32. The first connecting member 31 is located on the first arm 1, and the second connecting member 32 is located on the second arm 2 (the first case). The first connecting member 31 and the second connecting member 32 are detachably connected. In actual design, the positions of the first connecting member 31 and the second connecting member 32 can be interchanged, that is, the second connecting member 32 is located on the first arm 1 and the first connecting member 31 is located on the second arm 2 (the second case). The following embodiments of the present invention will be illustrated by taking the first case as an example;

[0053] The adapter 4 is used to sleeved on the connecting rib 21 when the connecting rib 21 is inserted into the second connecting groove 12, and is respectively connected to the first connecting member 31 and the second connecting member 32;

[0054] The drone arm connection structure can be switched between the following two states:

[0055] In the short arm state, the connecting rib 21 is inserted into the end of the first connecting groove 11, and the first connecting member 31 and the second connecting member 32 are connected to realize the connection and locking of the first arm 1 and the second arm 2;

[0056] In the long arm state, the connecting rib 21 is inserted into the end of the second connecting groove 12, the adapter 4 is sleeved on the connecting rib 21, and the two ends are respectively connected to the first connecting member 31 and the second connecting member 32 to connect and lock the first arm 1 and the second arm 2.

[0057] For the drone arm connection structure proposed in the embodiments of the present invention, when it needs to be switched to the short arm state, the connecting rib 21 is inserted into the first connecting groove 11, and the first connecting member 31 and the second connecting member 32 are connected to realize the connection and locking of the first arm 1 and the second arm 2; when it needs to be switched to the long arm state, the connecting rib 21 is inserted into the second connecting groove 12, the adapter 4 is sleeved on the connecting rib 21, and the two ends are respectively connected to the first connecting member 31 and the second connecting member 32. Through the above structure, the drone arm can freely switch the length of the arm in different weather environments, so as to adapt to different weather environments, improve the wind resistance and flexibility of the drone during flight, and thus facilitate the control of the drone.

[0058] In some embodiments, the first connecting member 31 includes a first elastic rod 311 and a first limiting block 312. The first elastic rod 311 can be pressed in a direction close to the axis of the first arm 1. The first limiting block 312 is located on the side of the first elastic rod 311 away from the axis of the first arm 1. The second connecting member 32 is a cuboid with an open side to form a first chamber 321 for accommodating the first elastic rod 311. A first limiting groove 322 is provided in the first chamber 321. The first limiting block 312 can bounce into the first limiting groove 322 under the restoring force of the first elastic rod 311. By pressing the first elastic rod 311 in a direction close to the axis of the first arm 1, the connecting rib 21 slides along the first connecting groove 11, driving the first elastic rod 311 to slide into the first chamber 321. When the first limiting block 312 reaches the position of the first limiting groove 322, the first limiting block 312 bounces into the first limiting groove 322 under the restoring force of the first elastic rod 311. At this time, the connecting rib 21 just reaches the end of the first connecting groove 11, thus realizing the detachable connection between the first connecting member 31 and the second connecting member 32. This connecting structure is relatively convenient and fast, facilitating the quick installation and disassembly of the first arm 1 and the second arm 2.

[0059] In a further embodiment, a return spring can also be provided on the side of the first elastic rod 311 away from the first limiting block 312. The return spring is located between the first elastic rod 311 and the first arm 1 (the second arm 2), providing a restoring force for the return of the first elastic rod 311, and ensuring that the first limiting block 312 is always located in the first limiting groove 322 when the first elastic rod 311 is not under external pressure, improving the reliability of the device.

[0060] In some embodiments, a guiding inclined surface 3121 is provided at one end of the first limiting block 312 close to the first limiting groove 322. Under the guiding action of the guiding inclined surface 3121, it is convenient for the first elastic rod 311 to be inserted into the first chamber 321. After inserting the end of the guiding inclined surface 3121 into the first chamber 321, the pressure on the first elastic rod 311 can be stopped. When the first limiting block 312 reaches the position of the first limiting groove 322, the first elastic rod 311 automatically rebounds, improving the convenience of the device.

[0061] In some embodiments, a limiting surface 3122 is provided at one end of the first limiting block 312 away from the guiding inclined surface 3121, and the limiting surface 3122 abuts against the side wall of the first limiting groove 322. When the first limiting block 312 enters the first limiting groove 322, its top surface abuts against the bottom of the first limiting groove 322, and its side surface is limited by the side wall of the first limiting groove 322. Without applying an external force to the first elastic rod 311, the first limiting block 312 will not slide out of the first limiting groove 322, improving the reliability and stability of the device.

[0062] In some embodiments, the adapter 4 includes a connecting cylinder 41, a third connecting member 42, and a fourth connecting member 43. A third connecting groove 411 is provided through the inner wall of the connecting cylinder 41 along the axial direction, and the connecting rib 21 is inserted into the third connecting groove 411. The third connecting member 42 and the fourth connecting member 43 are respectively arranged at both ends of the connecting cylinder 41. The third connecting member 42 connects the first connecting member 31, and the fourth connecting member 43 connects the second connecting member 32. Both ends of the connecting cylinder 41 respectively abut against the end faces where the ends of the connecting ribs 21 of the first arm 1 and the second arm 2 are located. The third connecting member 42 connects the first connecting member 31, and the fourth connecting member 43 connects the second connecting member 32. At this time, the connecting rib 21 just reaches the end of the second connecting groove 12.

[0063] In some embodiments, there are two groups of the first limiting grooves 322, and each group of the first limiting grooves 322 has at least one. The included angle between two adjacent first limiting grooves 322 is 90 degrees, and the included angle between the central axes of the first connecting groove 11 and the second connecting groove 12 is 90 degrees. When the limiting rib is connected to the first connecting groove 11, the first limiting block 312 is connected to one group of the first limiting grooves 322. When the limiting rib is connected to the second connecting groove 12, the third connecting member 42 is connected to the first limiting block 312, and the fourth connecting member 43 is connected to the other group of the first limiting grooves 322. Through the above structure, the first connecting member 31 can be connected to the second connecting member 32 or the third connecting member 42, realizing the adjustment of the length of the drone arm.

[0064] In some embodiments, the fourth connecting member 43 includes a second elastic rod 431 and a second limiting block 432. The included angle between the second elastic rod 431 and the first elastic rod 311 is 90 degrees. The second elastic rod 431 can be pressed in a direction close to the axis of the first arm 1. The second limiting block 432 is located on the side of the second elastic rod 431 away from the axis of the first arm 1. The third connecting member 42 is a cuboid with one open side to form a second chamber 421 for accommodating the second elastic rod 431. A second limiting groove 422 is provided in the second chamber 421. The second limiting block 432 can bounce into the second limiting groove 422 under the restoring force of the second elastic rod 431.

[0065] In some embodiments, the maximum adjustment distance of the length of the drone arm connection structure is the difference between the length of the first connection groove 11 and the length of the second connection groove 12. During specific design, the difference between the length of the first connection groove 11 and the length of the second connection groove 12 can be specifically designed according to the adjustment distance of the length of the drone arm connection structure, so as to better improve the adaptability of the drone to different weather environments and enhance the wind resistance and flexibility of the drone during flight.

[0066] In some embodiments, there are two first connection grooves 11, two second connection grooves 12, and two connection ridges 21. The included angle between the two first connection grooves 11 is 180 degrees, the included angle between the two second connection grooves 12 is 180 degrees, and the included angle between the two connection ridges 21 is 180 degrees. The two connection ridges 21 are used to plug into the two first connection grooves 11 or the two second connection grooves 12. By using the two connection ridges 21 to plug into the two first connection grooves 11 or the two second connection grooves 12, the forces on the first arm 1 and the second arm 2 after plugging are symmetric and uniform, which can better resist the torque on the drone arms and improve the reliability of the device.

[0067] The working principle of the drone arm connection structure in this embodiment is as follows: In the short arm state, the connection ridge 21 is plugged into the end of the first connection groove 11, and the first connecting member 31 and the second connecting member 32 are connected to realize the connection and locking of the first arm 1 and the second arm 2. In the long arm state, the connection ridge 21 is plugged into the end of the second connection groove 12, and the adapter 4 is sleeved on the connection ridge 21, and the two ends are respectively connected to the first connecting member 31 and the second connecting member 32 to connect and lock the first arm 1 and the second arm 2. Through the above structure, the drone arm can freely switch the length of the arm in different weather environments, so as to adapt to different weather environments, improve the wind resistance and flexibility of the drone during flight, and thus facilitate the control of the drone.

[0068] Based on the same inventive concept, an embodiment of the second aspect of the present invention is described in combination with Figure 12 As shown, a drone is proposed, which includes a fuselage 100 and a plurality of drone arm connection structures as described in the first aspect. A plurality of the first arms 1 are evenly installed on the fuselage 100. The lower part of the fuselage 100 is used for lifting goods.

[0069] The drone proposed by the embodiment of the present invention can adapt to different weather environments, improve the wind resistance and flexibility of the drone during flight, and thus facilitate the control of the drone.

[0070] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A drone arm connection structure, characterized in that: The invention comprises a first machine arm, a second machine arm, a locking assembly and an adapter, wherein: One end of the first arm is connected to the fuselage of the drone, and the inner wall of the other end is provided with a first connecting groove and a second connecting groove along the axial direction, and the length of the first connecting groove is greater than the length of the second connecting groove; The outer wall of the second machine arm is provided with a connecting ridge along the axial direction, the connecting ridge is used to be plugged into the first connecting groove or the second connecting groove, and one end of the second machine arm away from the connecting ridge is used to be connected to the wing; The locking assembly comprises a first connecting member and a second connecting member, one of the first connecting member and the second connecting member is located on the first machine arm, and the other is located on the second machine arm, and the first connecting member and the second connecting member are detachably connected; The adapter is used to be sleeved on the connecting convex strip when the connecting convex strip is inserted into the second connecting groove, and is used to connect the first connecting piece and the second connecting piece respectively.

2. The drone arm connection structure according to claim 1, characterized in that: The first connecting member includes a first elastic rod and a first limit block, the first elastic rod can be pressed in a direction close to the axis of the first machine arm, and the first limit block is located on the side of the first elastic rod away from the axis of the first machine arm; the second connecting member is a rectangular parallelepiped with an open side to form a first chamber for accommodating the first elastic rod, and a first limit groove is provided in the first chamber, and the first limit block can bounce up into the first limit groove under the action of the reset force of the first elastic rod.

3. The drone arm connection structure according to claim 2, characterized in that: A guiding inclined surface is provided at one end of the first limiting block close to the first limiting groove.

4. The drone arm connection structure according to claim 3, characterized in that: A limiting surface is provided at one end of the first limiting block away from the guiding inclined surface, and the limiting surface abuts against the side wall of the first limiting groove.

5. The drone arm connection structure according to claim 4, characterized in that: The adapter includes a connecting cylinder, a third connecting member and a fourth connecting member. The inner wall of the connecting cylinder is provided with a third connecting groove along the axial direction. The connecting ridge is inserted into the third connecting groove. The third connecting member and the fourth connecting member are respectively arranged at both ends of the connecting cylinder. The third connecting member is connected to the first connecting member, and the fourth connecting member is connected to the second connecting member.

6. The drone arm connection structure according to claim 5, characterized in that: There are two groups of the first limiting grooves, each group of the first limiting grooves has at least one, the angle between two adjacent first limiting grooves is 90 degrees, and the angle between the central axis of the first connecting groove and the central axis of the second connecting groove is 90 degrees; When the limiting convex strip is connected to the first connection groove, the first limiting block is connected to one group of the first limiting grooves; When the limiting convex strip is connected to the second connecting groove, the third connecting member is connected to the first limiting block, and the fourth connecting member is connected to another group of the first limiting grooves.

7. The drone arm connection structure according to claim 6, characterized in that: The fourth connecting member includes a second elastic rod and a second limit block, the included angle between the second elastic rod and the first elastic rod is 90 degrees, the second elastic rod can be pressed in a direction close to the axis of the first machine arm, and the second limit block is located on the side of the second elastic rod away from the axis of the first machine arm; the third connecting member is a rectangular parallelepiped with an open side to form a second chamber for accommodating the second elastic rod, and a second limit groove is provided in the second chamber, and the second limit block can bounce up into the second limit groove under the action of the reset force of the second elastic rod.

8. The drone arm connection structure according to claim 1, characterized in that: The maximum adjustment distance of the length of the drone arm connection structure is the difference between the length of the first connection groove and the length of the second connection groove.

9. The drone arm connection structure according to claim 1, characterized in that: There are two of each of the first connecting groove, the second connecting groove and the connecting ridge, the included angle between the two first connecting grooves is 180 degrees, the included angle between the two second connecting grooves is 180 degrees, the included angle between the two connecting ridges is 180 degrees, and the two connecting ridges are used to plug into the two first connecting grooves or the two second connecting grooves.

10. A drone, characterized in that: It comprises a fuselage, and a plurality of drone arm connection structures as described in any one of claims 1 to 9, wherein the plurality of first arms are evenly installed on the fuselage.

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