A folding mechanism for multi-rotor drone arms and multi-rotor drone

Abstract

The present application discloses a folding mechanism for a multi-rotor UAV arm and a multi-rotor UAV, which relates to the field of UAVs and aims to solve the problems of the existing arm spring shaft, which has a short service life and is not drop-resistant, is difficult to assemble and maintain, and the quick-release pipe clamp folding parts mostly use threaded connections, have slow disassembly and assembly efficiency, and are limited to tubular arms; the mechanism comprises: a fixing member, which is used to be arranged on a body; a cam spindle, which is threadedly arranged on the fixing member; a main spring, one end of which is tightly sleeved on the end of the cam spindle close to the fixing member and the other end is tightly pressed against a specific groove of the fixing member; a connecting member, which is rotatably sleeved on the end of the cam spindle away from the fixing member, and the connecting member is used to install the arm; a cam handle, one end of which is hingedly arranged on one end of the cam spindle passing through the connecting member and is tightly pressed against the connecting member, and the cam handle has a locking position and a releasing position.

Description

Technical Field

[0001] The present application relates to the field of unmanned aerial vehicles, and in particular to a folding mechanism for a multi-rotor unmanned aerial vehicle arm and a multi-rotor unmanned aerial vehicle. Background Art

[0002] The existing machine arm spring shaft has a short life and is not drop-resistant, and is difficult to assemble and maintain. The quick-release pipe clamp folding parts are mostly connected by threads, which has a slow disassembly and assembly efficiency and is limited to tubular machine arms.

[0003] Therefore, the prior art still needs to be improved. Utility Model Content

[0004] The purpose of the present application is to provide a folding mechanism for the arm of a multi-rotor UAV and a multi-rotor UAV, so as to solve the problems of the existing arm spring shaft, short life and low drop resistance, high assembly and maintenance difficulties, quick-release pipe clamp folding parts mostly using threaded connections, slow disassembly and assembly efficiency, and being limited to tubular arms.

[0005] To achieve the above-mentioned purpose, a first aspect of an embodiment of the present application provides a folding mechanism for a multi-rotor drone arm, comprising:

[0006] A fixing member, used for being arranged on the machine body;

[0007] A cam spindle, threadedly disposed on the fixing member;

[0008] A main spring, one end of which is tightly sleeved on the end of the cam main shaft close to the fixing member, and the other end of which is tightly pressed into the fixing member;

[0009] A connecting piece, rotatably sleeved on the end of the cam main shaft away from the fixing piece, and the connecting piece is used for installing the machine arm;

[0010] A cam handle, one end of which is hingedly arranged on one end of the cam main shaft passing through the connecting piece and is pressed against the connecting piece, and the cam handle has a locking position and a releasing position;

[0011] When the cam handle rotates to its locking position and abuts against the connecting member, the connecting member presses the fixing member;

[0012] When the cam handle is rotated to its released position, the connecting member is separated from the fixing member.

[0013] According to the folding mechanism for the arm of a multi-rotor drone described above, the cam handle has a supplementary position. When the supplementary position of the cam handle is pressed against the connecting piece, the distance between the cam handle and the connecting piece is the longest eccentricity, and the longest eccentricity is greater than the gap between the connecting piece and the fixing piece.

[0014] According to the above-mentioned folding mechanism for the arm of a multi-rotor drone, the fixing piece is provided with a limiting groove, and when the cam handle is rotated to its locking position and pressed against the connecting piece, the end of the connecting piece close to the fixing piece is sunk into the limiting groove.

[0015] According to the above-mentioned folding mechanism for the arm of a multi-rotor drone, the folding mechanism further comprises:

[0016] A limiting shaft, sleeved on the fixing member;

[0017] A safety spring, one end of which is tightly sleeved on the end of the limit shaft close to the fixing member, and the other end of which is tightly pressed against the third shaft shoulder in the connecting member;

[0018] A fixed pull head is arranged on one end of the limiting shaft passing through the connecting piece.

[0019] According to the above-mentioned folding mechanism for the arm of a multi-rotor drone, a first shoulder is provided on the end of the limit shaft close to the fixing member, and the safety spring is tightly sleeved on the first shoulder.

[0020] According to the above-mentioned folding mechanism for the arm of a multi-rotor drone, the folding mechanism further comprises:

[0021] The anti-wear part is sleeved on one end of the cam main shaft passing through the connecting part, and is arranged between the connecting part and the cam handle.

[0022] According to the above-mentioned folding mechanism for the arm of a multi-rotor drone, a limiting step is provided on the end of the cam main shaft away from the fixing member, and the anti-wear member is arranged on the limiting step.

[0023] According to the above-mentioned folding mechanism for the arm of a multi-rotor drone, the cam handle is sleeved on the end of the cam main shaft away from the fixing member, and the folding mechanism for the arm of a multi-rotor drone further includes:

[0024] an articulated roller, passing through the cam handle, the cam spindle and the cam handle in sequence;

[0025] A first limiting head is arranged on one end of the hinged roller passing through the cam handle;

[0026] The second limiting head is arranged on the other end of the hinged roller passing through the cam handle.

[0027] According to the above-mentioned folding mechanism for the arm of a multi-rotor drone, a second shoulder is provided on the end of the cam main shaft close to the fixing piece, and the fixing piece is provided with a peripheral groove. One end of the main spring facing away from the fixing piece is tightly sleeved on the second shoulder, and the other end is tightly pressed into the peripheral groove.

[0028] A second aspect of an embodiment of the present application provides a multi-rotor UAV, comprising a body, a plurality of arms and a plurality of folding mechanisms for the arms of the multi-rotor UAV as described above, wherein the plurality of folding mechanisms for the arms of the multi-rotor UAV are arranged on the body, and the arms correspond one-to-one with the folding mechanisms for the arms of the multi-rotor UAV and are arranged on the corresponding folding mechanisms for the arms of the multi-rotor UAV.

[0029] The folding mechanism for the arm of a multi-rotor drone and the multi-rotor drone provided by the present application have at least the following beneficial effects:

[0030] The cam handle of the present application can rotate relative to the cam main shaft and press against the connecting piece. The present application utilizes the cam principle. When the cam handle is rotated to its locking position and presses against the connecting piece, the distance between the axis center of the cam handle and the connecting piece is the longest, so that the cam handle presses the connecting piece against the fixing piece. At this time, the cam handle causes the folding mechanism to be in a locked state. Due to the friction between the cam handle and the connecting piece, the cam handle can still remain pressed against the connecting piece when the external force of the cam handle is removed; when external force is applied and the cam handle is rotated to its loosened position, the distance between the axis center of the cam handle and the connecting piece becomes shorter, so that the connecting piece is separated from the fixing piece. At this time, the cam handle causes the folding mechanism to be in an unlocked state. The multi-rotor drone of the present application can be easily unlocked whether in use or in operation. During transportation, the folding mechanism is mainly in a locked state; the present application sets a threaded connection between the cam main shaft and the fixing part and sets a main spring, so that the pressing stroke of the cam main shaft on the fixing part and the pre-tightening force can be adjusted, the cushioning performance is good and the service life is long, and the precision requirements for manufacturing and assembly of the folding mechanism can be reduced; the setting position of the arm of the present application bypasses the folding point position of the folding mechanism and is fixed on the connecting part, which not only can make the arm fully modular and improve the interchangeability and maintainability of the arm, but also is not limited to the shape and size of the arm, and has good versatility; and the present application can also fold the arm of a multi-rotor UAV through the folding mechanism, and make the arm of the multi-rotor UAV in the folded state in a locked state, which is convenient for transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A structural schematic diagram of one angle of the arm being in an unfolded state when a folding mechanism for the arm of a multi-rotor drone is provided on the multi-rotor drone is provided for an embodiment of the present application.

[0033] Figure 2 A structural schematic diagram of another angle showing that a folding mechanism for a multi-rotor UAV arm is provided on the multi-rotor UAV and the arm is in an unfolded state is provided for an embodiment of the present application.

[0034] Figure 3 A structural schematic diagram of a multi-rotor drone arm in a folded state when a folding mechanism for the arm of the multi-rotor drone is provided on the multi-rotor drone is provided for an embodiment of the present application.

[0035] Figure 4 A structural schematic diagram of a folding mechanism for a multi-rotor drone arm is provided for an embodiment of the present application.

[0036] Figure 5 for Figure 4 Partial exploded view.

[0037] Figure 6 for Figure 4 Global exploded diagram of .

[0038] Among them, the reference numerals in the figure are:

[0039] 1. Machine body; 2. Machine arm; 3. Fixing part; 31. Threaded hole; 32. Peripheral groove; 33. Limiting groove; 4. Cam main shaft; 41. Limiting step; 42. Second shoulder; 5. Main spring; 6. Connecting part; 7. Cam handle; 71. Locking position; 72. Release position; 73. Supplementary position; 81. Limiting shaft; 811. First shoulder; 82. Safety spring; 83. Fixed pull head; 9. Anti-wear part; 101. Articulated roller; 102. First limiting head; 103. Second limiting head; 11. Connecting gasket. DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0041] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly or indirectly located on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The directions or positions indicated by the terms "upper", "lower", "left", "right", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the directions or positions shown in the accompanying drawings and are only for the convenience of description and cannot be understood as limitations on the present technical solution. The terms "first" and "second" are only used for the convenience of description and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0042] See also Figure 1 , Figure 4 , Figure 5 and Figure 6 In a first aspect, the present embodiment provides a folding mechanism for a multi-rotor unmanned aerial vehicle arm, comprising a fixing member 3, a cam main shaft 4, a main spring 5, a connecting member 6 and a cam handle 7, wherein the fixing member 3 is used to be arranged on a body 1, the cam main shaft 4 is threadedly arranged on the fixing member 3, one end of the main spring 5 is tightly sleeved on the end of the cam main shaft 4 close to the fixing member 3, and the other end is tightly pressed against the fixing member 3, the connecting member 6 is rotatably sleeved on the end of the cam main shaft 4 away from the fixing member 3, the connecting member 6 is used to install the arm 2, one end of the cam handle 7 is hingedly arranged on one end of the cam main shaft 4 passing through the connecting member 6, and is tightly pressed against the connecting member 6, the cam handle 7 has a locking position 71 and a releasing position 72, when the cam handle 7 is rotated to its locking position 71 and pressed against the connecting member 6, the connecting member 6 presses the fixing member 3, and when the cam handle 7 is rotated to its releasing position 72, the connecting member 6 is separated from the fixing member 3;

[0043] It can be foreseen that the cam handle 7 of the present embodiment can be rotated relative to the cam main shaft 4 and pressed against the connecting member 6. The present embodiment utilizes the cam principle. When the cam handle 7 is rotated to its locking position 71 and pressed against the connecting member 6, the distance between the axis center of the cam handle 7 and the connecting member 6 is the longest, so that the cam handle 7 presses the connecting member 6 against the fixing member 3. At this time, the cam handle 7 causes the folding mechanism to be in a locked state. It can be understood that due to the friction between the cam handle 7 and the connecting member 6, the cam handle 7 can still remain pressed against the connecting member 6 when the external force is removed; when an external force is applied and the cam handle 7 is rotated to its release position 72, the distance between the axis center of the cam handle 7 and the connecting member 6 becomes shorter, so that the connecting member 6 is separated from the fixing member 3. At this time, the cam handle 7 causes the folding mechanism to be in an unlocked state. The folding mechanism of the multi-rotor drone of the present embodiment is mainly in a locked state whether it is in use or in transportation.

[0044] In this embodiment, by setting the cam main shaft 4 and the fixing part 3 into a threaded connection and providing a main spring 5, the pressing stroke of the cam main shaft 4 on the fixing part 3 can be adjusted and a pre-tightening force can be provided. The cushioning performance is good and the service life is long, and the precision requirements for the manufacturing and assembly of the folding mechanism can be reduced. The setting position of the arm 2 of this embodiment bypasses the folding point position of the folding mechanism and is fixedly set on the connecting part 6. Not only can the arm 2 be completely modularized to improve the interchangeability and maintainability of the arm 2, but it is also not limited to the shape and size of the arm 2. For example, the shape of the arm 2 can be set to be tubular, square, plate-shaped, etc., and it has good versatility. Moreover, the present embodiment can also fold the multi-rotor UAV arm 2 through the folding mechanism, and make the multi-rotor UAV arm 2 in the folded state in a locked state for easy transportation.

[0045] Optional, see Figure 4 The cam handle 7 has a supplementary position 73. When the supplementary position 73 of the cam handle 7 is pressed against the connecting member 6, the distance between the cam handle 7 and the connecting member 6 is the longest eccentricity, and the longest eccentricity is greater than the gap between the connecting member 6 and the fixing member 3. Through the above arrangement, especially when the cam handle 7 and / or the connecting member 6 are worn, the cam handle 7 can be rotated to make its supplementary position 73 press against the connecting member 6 to compensate for the stroke so that the connecting member 6 continues to press the fixing member 3, so that the folding mechanism can continue to be locked and used normally.

[0046] Optional, see Figure 5 and Figure 6The fixing member 3 can be a rectangular fixing block, and the upper end surface and the lower end surface of the fixing member 3 are used to be fixed on the body 1. The fixing member 3 is provided with a threaded hole 31, and the cam main shaft 4 is arranged in the threaded hole 31. The threaded hole 31 of the fixing member 3 is provided with an outer peripheral groove 32 outside, and the end of the main spring 5 close to the fixing member 3 is pressed against the outer peripheral groove 32.

[0047] The above is mainly through the friction between the cam handle 7 and the connecting piece 6, so that when the external force of the cam handle 7 is removed, it can still remain tight on the connecting piece 6, but this will make the cam handle 7 bear a lot of friction, which is easy to damage the cam handle 7. It is worth exploring that the existing cam locking device can achieve the compression of the axis of the cam eccentricity, but in some working conditions such as the multi-rotor UAV arm 2, the radial connection must also be achieved. At present, the mechanical method of installing an expansion cone sleeve on the main shaft is often adopted. During the cam compression process, the expansion cone sleeve expands to achieve radial compression. Then the working condition of the expansion cone sleeve requires fatigue strength and durability. It is generally made of metal and has high requirements for heat treatment. The disadvantages are also heavy and troublesome maintenance. The cone sleeve must be maintained and lubricated frequently, otherwise it is easy to get stuck, difficult to disassemble, and has a short life.

[0048] For this purpose, optionally, see Figure 5 The fixing member 3 is provided with a limiting groove 33. When the cam handle 7 is rotated to its locking position 71 and pressed against the connecting member 6, the end of the connecting member 6 close to the fixing member 3 is sunk into the limiting groove 33. That is to say, in this embodiment, by providing the limiting groove 33 on the fixing member 3, the displacement of the connecting member 6 in the vertical direction can be limited when the folding mechanism is in the locked state, which can not only reduce the wear of the cam handle 7 pressed against the connecting member 6, but also ensure the stability and rigidity of the machine arm 2.

[0049] For further, optional, see Figure 5 The folding mechanism further includes a limit shaft 81, a safety spring 82 and a fixed pull head 83. The limit shaft 81 is sleeved on the fixing member 3. One end of the safety spring 82 is tightly sleeved on the end of the limit shaft 81 close to the fixing member 3, and the other end is tightly pressed against the third shaft shoulder in the connecting member 6. The fixed pull head 83 is arranged on one end of the limit shaft 81 passing through the connecting member 6.

[0050] In this embodiment, a limit shaft 81 is set so that it and the cam main shaft 4 serve as two fixed points. When the folding mechanism is in a locked state, the fixing member 3 and the connecting member 6 are respectively connected to limit the displacement of the connecting member 6 in the horizontal direction. This can not only further reduce the wear of the cam handle 7 on the connecting member 6, but also further ensure the stability and rigidity of the arm 2. In this embodiment, a fixed pull head 83 is set to facilitate the operation of the limit shaft 81 to connect or disconnect from the fixing member 3 to convert the folding state of the arm 2 (folded or unfolded). In this embodiment, a safety spring 82 is set to ensure that the end of the limit shaft 81 is always in an extended state.

[0051] Optional, see Figure 6 A first shaft shoulder 811 is formed on the end of the limiting shaft 81 close to the fixing member 3 , and the safety spring 82 is tightly sleeved on the first shaft shoulder 811 .

[0052] Optional, see Figure 5 and Figure 6 The folding mechanism also includes an anti-wear part 9, which can be an anti-wear sheet. The anti-wear part 9 is sleeved on one end of the cam main shaft 4 passing through the connecting member 6, and is tightly pressed between the connecting member 6 and the cam handle 7. By setting the anti-wear part 9, this embodiment can avoid direct contact between the cam handle 7 and the connecting member 6, thereby reducing the loss of the connecting member 6. Among them, the anti-wear sheet has the lowest hardness and generally wears itself. When it wears a lot, it can be replaced, thereby reducing the maintenance cost of the entire large component.

[0053] Optional, see Figure 6 A limiting step 41 is provided on the end of the cam main shaft 4 away from the fixing member 3, and the anti-wear member 9 is arranged on the limiting step 41. In this embodiment, the installation position of the anti-wear member 9 is located by setting the limiting step 41, which facilitates installation.

[0054] Optional, see Figure 6 The cam handle 7 is sleeved on the end of the cam main shaft 4 away from the fixing member 3, and the folding mechanism also includes a hinged roller 101, a first limit head 102 and a second limit head 103. The hinged roller 101 passes through the cam handle 7, the cam main shaft 4 and the cam handle 7 in sequence, the first limit head 102 is arranged on one end of the hinged roller 101 passing through the cam handle 7, and the second limit head 103 is arranged on the other end of the hinged roller 101 passing through the cam handle 7, wherein the first limit head 102 and the second limit head 103 are both detachably connected to the hinged roller 101.

[0055] Optional, see Figure 6A second shoulder 42 is provided on the end of the cam main shaft 4 close to the fixing member 3 , and one end of the main spring 5 facing away from the fixing member 3 is tightly sleeved on the second shoulder 42 , and the other end is tightly pressed against the outer peripheral groove 32 .

[0056] Optional, see Figure 5 and Figure 6 The folding mechanism also includes a connecting gasket 11, which is sleeved on the cam main shaft 4 and located between the fixing member 3 and the connecting member 6. By setting the connecting gasket 11, this embodiment can make the connecting member 6 more tightly pressed against the fixing member 3, thereby enhancing the locking strength of the folding mechanism.

[0057] A second aspect of this embodiment provides a multi-rotor UAV, comprising a body 1, several arms 2 and several folding mechanisms for the arms of the multi-rotor UAV as described above, wherein the several folding mechanisms for the arms of the multi-rotor UAV are arranged on the body 1, and the arms 2 correspond one-to-one with the folding mechanisms for the arms of the multi-rotor UAV and are arranged on the corresponding folding mechanisms for the arms of the multi-rotor UAV.

[0058] Working principle of a folding mechanism for a multi-rotor drone arm:

[0059] See also Figure 1 and Figure 2 , the arm 2 is in a fully unfolded state, at which time the folding mechanism is in a locked state, that is, the cam handle 7 is rotated to its locking position 71 and pressed against the anti-wear member 9, so that the connecting member 6 is pressed and sunk into the limiting convex groove, and the limiting shaft 81 is connected to the fixing member 3;

[0060] See also Figure 3 When the machine arm 2 needs to be folded up, by rotating the cam handle 7 to its release position 72 and separating the limiting shaft 81 from the fixing part 3, the pressing state of the connecting part 6 on the fixing part 3 can be contacted. At this time, the cam handle 7 is released, and the connecting part 6 is disengaged from the limiting groove 33. Then, the connecting part 6 is rotated 180° to fold the machine arm 2 inward. After the machine arm 2 is folded, the cam handle 7 is continued to be rotated to its locking position 71 to press against the anti-wear part 9, so that the connecting part 6 is pressed and sinks into the limiting groove, so that the folding mechanism is in a locked state, so that the machine arm 2 will not loosen, which is convenient for transportation.

[0061] In summary, the present application provides a folding mechanism for the arm of a multi-rotor UAV and a multi-rotor UAV, comprising a fixing member 3, a cam spindle 4, a main spring 5, a connecting member 6 and a cam handle 7, wherein the fixing member 3 is used to be arranged on a body 1, the cam spindle 4 is threadedly arranged on the fixing member 3, one end of the main spring 5 is tightly sleeved on the end of the cam spindle 4 close to the fixing member 3, and the other end is tightly pressed against the fixing member 3, the connecting member 6 is rotatably sleeved on the end of the cam spindle 4 away from the fixing member 3, the connecting member 6 is used to install the arm 2, one end of the cam handle 7 is hingedly arranged on one end of the cam spindle 4 passing through the connecting member 6, and is tightly pressed against the connecting member 6, the cam handle 7 has a locking position 71 and a releasing position 72, when the cam handle 7 is rotated to its locking position 71 and pressed against the connecting member 6, the connecting member 6 presses the fixing member 3, and when the cam handle 7 is rotated to its releasing position 72, The connecting member 6 is separated from the fixing member 3; it is foreseeable that the cam handle 7 of the present application can rotate relative to the cam main shaft 4 and press against the connecting member 6. The present application utilizes the cam principle. When the cam handle 7 is rotated to its locking position 71 and presses against the connecting member 6, the distance between the axis of the cam handle 7 and the connecting member 6 is the longest, so that the cam handle 7 presses the connecting member 6 against the fixing member 3. At this time, the cam handle 7 causes the folding mechanism to be in a locked state. It is understandable that due to the friction between the cam handle 7 and the connecting member 6, the cam handle 7 can still remain pressed against the connecting member 6 when the external force is removed; when an external force is applied, the cam handle 7 rotates to its release position 72, and the distance between the axis of the cam handle 7 and the connecting member 6 becomes shorter, so that the connecting member 6 is separated from the fixing member 3. At this time, the cam handle 7 causes the folding mechanism to be in an unlocked state. The folding mechanism of the multi-rotor drone of the present application is mainly in a locked state whether it is in use or in transportation. The present application sets the cam main shaft 4 and the fixing part 3 in a threaded connection mode and sets a main spring 5, thereby adjusting the pressing stroke of the cam main shaft 4 on the fixing part 3 and providing a pre-tightening force, which has good cushioning performance and long service life, and can reduce the precision requirements for the manufacturing and assembly of the folding mechanism; the setting position of the arm 2 of the present application bypasses the folding point position of the folding mechanism and is fixedly set on the connecting part 6, which not only can make the arm 2 fully modular and improve the interchangeability and maintainability of the arm 2, but is also not limited to the shape and size of the arm 2, and has good versatility; and, the present application can also fold the multi-rotor UAV arm 2 through the folding mechanism, and make the multi-rotor UAV arm 2 in the folded state in a locked state, which is convenient for transportation.

[0062] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A folding mechanism for a multi-rotor drone arm, characterized in that: include: A fixing member, used for being arranged on the machine body; A cam spindle, threadedly disposed on the fixing member; A main spring, one end of which is tightly sleeved on the end of the cam main shaft close to the fixing member, and the other end of which is tightly pressed into the fixing member; A connecting piece, rotatably sleeved on the end of the cam main shaft away from the fixing piece, and the connecting piece is used for installing the machine arm; A cam handle, one end of which is hingedly arranged on one end of the cam main shaft passing through the connecting piece and is pressed against the connecting piece, and the cam handle has a locking position and a releasing position; When the cam handle rotates to its locking position and abuts against the connecting member, the connecting member presses the fixing member; When the cam handle is rotated to its released position, the connecting member is separated from the fixing member.

2. The folding mechanism for the arm of a multi-rotor drone according to claim 1, characterized in that: The cam handle has a supplementary position. When the supplementary position of the cam handle is pressed against the connecting member, the distance between the cam handle and the connecting member is the longest eccentricity, and the longest eccentricity is greater than the gap between the connecting member and the fixing member.

3. The folding mechanism for the arm of a multi-rotor drone according to claim 2, characterized in that: The fixing member is provided with a limiting groove. When the cam handle is rotated to its locking position and pressed against the connecting member, the end of the connecting member close to the fixing member is sunk into the limiting groove.

4. The folding mechanism for the arm of a multi-rotor drone according to claim 3, characterized in that: The folding mechanism also includes: A limiting shaft, sleeved on the fixing member; A safety spring, one end of which is tightly sleeved on the end of the limit shaft close to the fixing member, and the other end of which is tightly pressed against the third shaft shoulder in the connecting member; A fixed pull head is arranged on one end of the limiting shaft passing through the connecting piece.

5. The folding mechanism for the arm of a multi-rotor drone according to claim 4, characterized in that: A first shaft shoulder is provided on the end of the limiting shaft close to the fixing member, and the safety spring is tightly sleeved on the first shaft shoulder.

6. The folding mechanism for a multi-rotor drone arm according to claim 1, characterized in that: The folding mechanism also includes: The anti-wear part is sleeved on one end of the cam main shaft passing through the connecting part, and is arranged between the connecting part and the cam handle.

7. The folding mechanism for the arm of a multi-rotor drone according to claim 6, characterized in that: A limiting step is provided on the end of the cam main shaft away from the fixing member, and the anti-wear member is arranged on the limiting step.

8. The folding mechanism for a multi-rotor drone arm according to claim 1, characterized in that: The cam handle is sleeved on the end of the cam main shaft away from the fixing member, and the folding mechanism for the multi-rotor drone arm also includes: an articulated roller, passing through the cam handle, the cam spindle and the cam handle in sequence; A first limiting head is arranged on one end of the hinged roller passing through the cam handle; The second limiting head is arranged on the other end of the hinged roller passing through the cam handle.

9. The folding mechanism for a multi-rotor drone arm according to claim 1, characterized in that: A second shoulder is provided on the end of the cam main shaft close to the fixing member, and a peripheral groove is provided on the fixing member. One end of the main spring away from the fixing member is tightly sleeved on the second shoulder, and the other end is tightly pressed into the peripheral groove.

10. A multi-rotor drone, characterized in that: It comprises a body, a plurality of arms and a plurality of folding mechanisms for multi-rotor UAV arms as described in any one of claims 1 to 9, wherein the plurality of folding mechanisms for multi-rotor UAV arms are arranged on the body, and the arms correspond one-to-one with the folding mechanisms for multi-rotor UAV arms and are arranged on the corresponding folding mechanisms for multi-rotor UAV arms.

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