Multi-rotor unmanned aerial vehicle protection device and multi-rotor unmanned aerial vehicle

Abstract

The utility model discloses a kind of multi-rotor unmanned aerial vehicle protection devices and multi-rotor unmanned aerial vehicle, protection device includes paddle guard frame assembly, guard frame power component and guard frame rotating assembly;Each rotor is equipped with two the paddle guard frame assembly;Each the paddle guard frame assembly is rotated and installed on rotor motor by guard frame rotating assembly;Each the paddle guard frame assembly is connected with the guard frame power component;The guard frame power component is used to drive paddle guard frame assembly to rotate between unfolding position and stowed position;In the unfolding position, the paddle guard frame assembly is located outside rotor to provide protection, in the stowed position, the paddle guard frame assembly is located inside rotor to reduce the width of unmanned aerial vehicle.The utility model has the advantages of light structure, simple operation, reduce the size of unmanned aerial vehicle transportation appearance on the basis of avoiding rotor and external object collision.

Description

Technical Field

[0001] This utility model mainly relates to the field of unmanned aerial vehicle (UAV) technology, specifically to a multi-rotor UAV protection device and a multi-rotor UAV. Background Technology

[0002] In today's era of rapid technological advancement, drones have demonstrated immense potential across numerous fields. Multi-rotor drones, with their flexible maneuverability and stable flight performance, have become invaluable assistants in many industries. However, their rotors are extremely fragile at high speeds. Contact with obstacles such as tree branches or buildings can not only damage the rotors but also cause the drone to lose control and crash, resulting in severe economic losses or even safety accidents. Therefore, equipping multi-rotor drones with reliable protective devices is crucial. However, most existing drone protective devices are one-piece enclosed designs, completely encasing the drone. This significantly increases the drone's size, hindering its transport and reducing its flight performance due to the added weight. This approach fails to adequately balance protection and performance, focusing solely on protection while neglecting the impact of the protective device on the drone's size, weight, and ease of operation. Specific issues can be explored through the analysis of typical patented technologies. 1. The anti-collision device for drones proposed in patent application CN219237404U is a typical example of adding a protective frame and outer shell to the outside of the drone fuselage. This method causes the overall size of the drone to become the size of the fixed outer frame, increasing the storage size and reducing the overall portability of the drone.

[0003] 2. The rotor protection structure proposed in patent application CN215245563U protects the rotor from all sides and above. Although the protection of the rotor is relatively comprehensive, it also has the problem of increasing the size of the drone. At the same time, because this design also adds a protective plate above the rotor, which serves as a rainproof function, it greatly increases the weight of the drone body, increases the windward area of ​​the drone, and reduces the drone's wind resistance.

[0004] 3. Patent application CN216401747U proposes a collision protection mechanism with a protective frame and spring energy absorption. This collision protection mechanism includes an aluminum alloy protective frame, a carbon fiber shock-absorbing arc plate, and an energy-absorbing spring. These structural components are all fixed and non-retractable, which also poses a problem for the storage and portability of drones. Furthermore, the assembly of multiple structural components brings a large workload to subsequent maintenance and replacement.

[0005] 4. Patent application CN221623978U proposes a drone flight collision avoidance device. This solution also uses springs to absorb energy during collisions. The advantage is that the collision avoidance device adopts a modular installation method, which can flexibly select the number of protective structures to install according to the actual application scenario. However, the need for disassembly and assembly also increases the complexity of operation.

[0006] 5. Patent application CN109677600A proposes a retractable drone rotor protection device and a drone. The advantage of this solution is that it takes into account both protection and the storage size of the drone. Its protective frame is a scalable structure. However, this solution introduces more structures to determine when the protective frame is fully extended and retracted, which increases the complexity of the overall mechanism and brings a large workload to subsequent maintenance and repair work. Utility Model Content

[0007] In view of the technical problems existing in the prior art, this utility model provides a multi-rotor drone protection device and a multi-rotor drone that reduces the transport size of the drone while avoiding collisions between the rotor and external objects.

[0008] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is as follows: A protective device for a multi-rotor unmanned aerial vehicle (UAV) includes a blade guard frame assembly, a guard frame power assembly, and a guard frame rotation assembly. Each rotor is equipped with two of the aforementioned blade guard assemblies; each of the aforementioned blade guard assemblies is rotatably mounted on the rotor motor via a guard rotator assembly; Each of the blade guard assemblies is connected to the guard power assembly; the guard power assembly is used to drive the blade guard assembly to rotate between an extended position and a retracted position; in the extended position, the blade guard assembly is located outside the rotor to provide protection, and in the retracted position, the blade guard assembly is located inside the rotor to reduce the width of the UAV.

[0009] As a further improvement to the above technical solution: The protective frame rotating assembly includes a first rotating assembly and a second rotating assembly; the first rotating assembly includes a rotating shaft and a bushing, the rotating shaft is located at the bottom of the rotor's motor, and the bushing is fitted onto the rotating shaft and connected to the bottom of the blade protective frame assembly.

[0010] The second rotating assembly includes hexagonal head bolts, ball bearing sleeves, and frame supports; multiple frame supports are fastened to the periphery of the motor; each frame support is equipped with two ball bearing sleeves, which are respectively fixed to the frame support by corresponding hexagonal head bolts; the blade guard assembly is surrounded by the corresponding ball bearing sleeves.

[0011] The protective frame power assembly includes a motor mounting plate, a linear motor, and a linear push rod assembly; the upper end of the motor mounting plate is fastened to the arm of the UAV, and the linear motor is fastened to the motor mounting plate; the linear motor is movably connected to the propeller protective frame assembly through the linear push rod assembly.

[0012] The linear push rod assembly includes a connecting plate and two linear push rods. The connecting plate is located at the telescopic end of the linear motor. One end of each of the two linear push rods is fastened to the connecting plate, and the other end is provided with a rectangular groove. The bottom of the blade guard frame assembly is provided with a corresponding boss, which is located in the rectangular groove.

[0013] The blade guard assembly is made of lightweight alloy and is hollow.

[0014] This utility model also discloses a multi-rotor drone, including a fuselage assembly and an arm assembly, wherein the arm assembly is installed on the left and right sides of the fuselage assembly; the arm assembly is also provided with the multi-rotor drone protective device as described above.

[0015] As a further improvement to the above technical solution: The fuselage assembly includes end guards, a body frame, and legs. The end guards are located at the front and rear ends of the body frame, and the legs are located below the body frame.

[0016] The airframe also includes a battery pack, a power management module, and a flight control module.

[0017] The boom assembly includes a blade, a motor, a motor mounting base, and a boom; the blade is mounted on the motor, the motor is mounted on the motor mounting base, and the motor mounting base is connected to the machine frame via the boom.

[0018] Compared with the prior art, the advantages of this utility model are: The propeller guard frame assembly, guard frame rotation assembly, and guard frame power assembly of this utility model all adopt a modular structure design. The layout of each module is compact, and the protection of each propeller blade can be extended and retracted independently, which effectively reduces weight and reduces the transport size of the UAV while ensuring mechanical strength. In addition, the horizontally separate rotation method avoids large-size overall flipping.

[0019] This invention utilizes a combined design of a linear motor and a linear push rod assembly to convert linear motion into rotational motion of the blade guard assembly. The rotation center for extension and retraction is based on the axis of the motor and blades, minimizing the impact on space during the process. The guard clamp is designed based on the motor housing, and combined with the rotation axis at the bottom of the motor mounting base, it forms two points of force, avoiding single-point cantilever of the large-sized blade guard assembly and enhancing structural rigidity.

[0020] The structure of this utility model adopts a lightweight design concept. The structural components such as the propeller guard frame are made of lightweight alloy. At the same time, the main structure is hollow, which can reduce weight while ensuring strength. The protective device of this utility model is simple to operate, widely applicable, quick to maintain and repair, does not affect the transport size, and can meet the needs of multi-rotor UAVs in different environments and missions.

[0021] This invention is designed to meet the flight safety requirements of multi-rotor drones. Through an innovative rotatable structure, it provides all-around protection during drone flight, effectively preventing the rotors from colliding with external objects. This protective device is mainly suitable for large, heavy-duty multi-rotor drones and can be widely used in drone equipment in professional fields such as industrial inspection, agricultural plant protection, mountain hoisting, and urban fire fighting. It has significant practical value and broad application prospects. Attached Figure Description

[0022] Figure 1 (a) is a schematic diagram of the structure of the multi-rotor UAV of this utility model; (b) is a diagram of the propeller guard assembly when it is deployed; (c) is a diagram of the propeller guard assembly when it is retracted.

[0023] Figure 2 This is a schematic diagram of the fuselage of the present invention in an embodiment.

[0024] Figure 3 This is a schematic diagram of the protective device of this utility model in a specific application.

[0025] Figure 4 The diagram shows the structure of the protective device of this utility model in an embodiment; (a) is the front view; (b) is the bottom view.

[0026] Figure 5 This is one of the connection structure diagrams of the first rotating component of this utility model.

[0027] Figure 6 This is the second connection structure diagram of the first rotating component of this utility model.

[0028] Figure 7 This is a connection structure diagram of the second rotating component of this utility model.

[0029] Figure 8 This is a structural diagram showing the connection between the linear motor and the machine arm of this utility model.

[0030] Figure 9 This is a diagram illustrating an embodiment of the second rotating component of this utility model in a specific application.

[0031] Figure 10 This is a schematic diagram of the structure of the blade guard frame assembly of this utility model.

[0032] Figure 11 This is a schematic diagram of the protective frame power assembly structure of this utility model.

[0033] Figure 12 This is a structural diagram of the second rotating component of this utility model in an embodiment.

[0034] Legend: 100, Fuselage assembly; 101, End guard; 102, Airframe; 103, Landing gear; 104, Battery pack; 105, Power management module; 106, Flight control module; 200, Arm assembly; 201, Propeller blade; 202, Motor; 203, Motor mount; 204, Arm; 205, Arm mounting flange; 210, Propeller blade guard assembly; 211, Propeller blade guard; 212, Protector... Frame clamp; 220, Guard frame power assembly; 221, Motor mounting plate; 222, Linear motor; 223, Linear push rod assembly; 2231, Connecting plate; 2232, Linear push rod; 2233, Rectangular slot; 2234, Boss; 224, Bolt; 230, Guard frame rotating assembly; 231, Hex head bolt; 232, Ball bearing bush; 233, Frame support; 234, Rotating shaft; 235, Bushing. Detailed Implementation

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0036] like Figure 3 and Figure 4 As shown, the multi-rotor drone protection device provided in this embodiment of the present invention includes a blade guard frame assembly 210, a guard frame power assembly 220, and a guard frame rotation assembly 230. Each rotor blade 201 of the UAV is equipped with two blade guard assemblies 210; each blade guard assembly 210 is rotatably mounted on the rotor motor 202 via a guard rotation assembly 230; each blade guard assembly 210 includes a blade guard 211 and a guard clamp 212, and the blade guard 211 and the guard clamp 212 are connected by bolts, such as Figure 10 As shown; Each blade guard assembly 210 is connected to the guard power assembly 220; the guard power assembly 220 is used to drive the blade guard assembly 210 to rotate between the deployed position and the retracted position; such as Figure 1 As shown, in the deployed position, the blade guard assembly 210 is located outside the blade 201 to provide protection; as Figure 2 As shown, in the retracted position, the propeller guard assembly 210 is located inside the propeller 201 to reduce the overall width of the drone.

[0037] like Figure 5 and Figure 6As shown, the rotor guard assembly 230 includes a first rotating assembly and a second rotating assembly; the first rotating assembly includes a rotating shaft 234 and a bushing 235, the rotating shaft 234 is located at the bottom of the rotor motor 202, and the bushing 235 is fitted onto the rotating shaft 234 and connected to the bottom of the rotor guard assembly 210. Figure 7 , Figure 9 and Figure 12 As shown, the second rotating assembly includes hexagonal head bolts 231, ball bearing sleeves 232, and frame supports 233; multiple frame supports 233 are fastened to the periphery of the motor 202; each frame support 233 is equipped with two ball bearing sleeves 232, which are respectively fixed to the frame support 233 by corresponding hexagonal head bolts 231; the protective frame clamp 212 is surrounded on the corresponding ball bearing sleeve 232, and the rotational support of the blade protective frame assembly 210 is achieved through the ball bearing sleeve 232.

[0038] like Figure 8 and Figure 11 As shown, the protective frame power assembly 220 includes a motor mounting plate 221, a linear motor 222, a linear push rod assembly 223, and bolts 224. The upper end of the motor mounting plate 221 is fastened to the UAV arm 204, and the linear motor 222 is fastened to the motor mounting plate 221 by bolts 224. The linear push rod assembly 223 includes a connecting plate 2231 and two linear push rods 2232. The connecting plate 2231 is located at the telescopic end of the linear motor 222, and one end of the two linear push rods 2232 is fastened to the connecting plate 2231, while the other end is provided with a rectangular groove 2233. The bottom of the propeller protective frame 211 is correspondingly provided with a boss 2234, which is located in the rectangular groove 2233.

[0039] In actual operation, the motor shaft of the linear motor 222 extends and retracts along the axial direction, driving the linear push rod 2232 of the linear push rod assembly 223 to move. The rectangular groove 2233 of the linear push rod 2232 drives the boss 2234 on the blade guard frame 211 to move, which in turn causes the bushing 235 at the bottom of the blade guard frame 211 to rotate on the rotating shaft 234. Simultaneously, the guard frame clamp 212 on the blade guard frame assembly 210 rotates on the ball bearing sleeve 232, thus realizing the overall rotational movement of the blade guard frame assembly 210. The ball bearing sleeve 232 ensures smooth and stable rotation without generating additional noise or vibration, thereby guaranteeing the stability and safety of the UAV flight.

[0040] The blade guard frame assembly 210, guard frame rotation assembly 230 and guard frame power assembly 220 of this utility model all adopt a modular structure design. The layout of each module is compact, and the protection of each blade 201 can be extended and retracted independently, which effectively reduces weight and reduces the transport size of the UAV while ensuring mechanical strength. In addition, the horizontally separated rotation method avoids large-size overall flipping.

[0041] This invention utilizes the combined design of a linear motor 222 and a linear push rod assembly 223 to convert linear motion into rotational motion of the blade guard assembly 210. Using the axes of the motor 202 and the blade 201 as the rotation center for extension and retraction reduces the impact on space during the process. The guard clamp 212 is designed based on the motor 202 housing, and combined with the rotation shaft 234 at the bottom of the motor mounting base 203, forms two points of force, avoiding single-point cantilever of the large-sized blade guard assembly 210 and enhancing structural rigidity.

[0042] The structure of this utility model adopts a lightweight design concept. The structural components such as the propeller guard frame assembly 210 are made of lightweight alloy. At the same time, the main structure is hollow, which can reduce weight while ensuring strength. The protective device of this utility model is simple to operate, widely applicable, quick to maintain and repair, does not affect the transport size, and can meet the needs of multi-rotor UAVs in different environments and missions.

[0043] This invention is designed to meet the flight safety requirements of multi-rotor drones. Through an innovative rotatable structure, it provides all-around protection during drone flight, effectively preventing the rotors from colliding with external objects. This protective device is mainly suitable for large, heavy-duty multi-rotor drones and can be widely used in drone equipment in professional fields such as industrial inspection, agricultural plant protection, mountain hoisting, and urban fire fighting. It has significant practical value and broad application prospects.

[0044] like Figure 1 As shown, this embodiment of the invention also provides a multi-rotor unmanned aerial vehicle (UAV), including a fuselage assembly 100, arm assemblies 200, and the protective device described above; wherein there are a total of six arm assemblies 200 on the left and right sides of the fuselage assembly 100, and the arm assemblies 200 are connected to the fuselage assembly 100. Figure 1 (a) shows the protective device in its deployed state; Figure 1 In (b), the protective device is in the retracted state. The propeller guard frame assembly 210 is rotated to the inside of the propeller 201 under the control of the guard frame power assembly 220, without increasing the width of the UAV itself.

[0045] like Figure 2As shown, the fuselage assembly 100 includes an end guard frame 101, a body frame 102, and landing gear 103. The end guard frame 101 is located at both the front and rear ends of the body frame 102 and is connected to the body frame 102. The landing gear 103 is located below the body frame 102. The body frame 102 also houses a battery pack 104, a power management module 105, and a flight control module 106. The power source for the protective device uses the UAV's own battery pack 104 as its core power source. The battery pack 104 is the UAV's fundamental power source and is indispensable. The added protective device makes reasonable use of the UAV's existing energy resources without adding extra power, achieving its purpose while avoiding excessive weight increase.

[0046] like Figure 4 As shown in (a) and (b), the boom assembly includes a blade 201, a motor 202, a motor mounting base 203, a boom 204, and a boom mounting flange 205. The blade 201 is mounted on the motor 202, which is mounted on the motor mounting base 203. The motor mounting base 203 is connected to the body frame 102 via the boom 204. Specifically, the boom 204 is fastened to the body frame 102 via the boom mounting flange 205.

[0047] like Figure 4 As shown in (a) and (b), each blade 201 is equipped with two blade guard assemblies 210. The blade guard assembly 210, together with the guard power assembly 220, the guard rotation assembly 230, and the motor mounting base 203, forms a stable triangular structure.

[0048] The present invention will now be described in detail with reference to specific embodiments: During the propeller guard 211 deployment phase: The system is powered by the battery pack 104. The power management module 105 controls the flight control module 106 and the guard power module 220 to power on. The flight control module 106 controls the linear motor 222 to extend along the axial direction, driving the linear push rod 223 to move. The linear push rod 223 drives the propeller guard 211 to rotate on the guard rotation assembly 230 with the rotation axis on the motor mounting base 203 as the axis, so that the two propeller guards 211 on the left and right sides of the arm 204 rotate from the inside of the propeller 201 to the outside of the propeller 201. The flight control module 106 controls the linear motor 222 to maintain this state during the operation of the UAV, which can protect the propeller 201.

[0049] Frame retraction phase: After the UAV finishes its work and lands, the flight control module 106 commands the linear motor 222 to retract along the axial direction, driving the linear push rod 223 to move. The linear push rod 223 drives the propeller guard 211 to rotate on the rotating assembly 230 with the rotating shaft on the motor mounting base 203 as the axis, so that the two propeller guards 211 on the left and right sides of the arm 204 rotate from the outside of the propeller 201 to the inside of the propeller 201. The flight control module 106 controls the linear motor 222 to maintain this state during the UAV transportation process to reduce the width of the UAV during transportation.

[0050] This utility model adopts a modular design, which is simple and convenient to operate and highly maintainable in the later stage. The blade guard frame 211 on each arm 204 is independent, which reduces weight and increases strength, while also facilitating quick problem location and fault repair in case of failure. The modular disassembly design reduces the complexity of maintenance path, and routine maintenance can be completed in a short time without the need for professional tools. The operation process is simple, and a single person can complete the entire process.

[0051] This utility model adopts a rotatable propeller guard 211, which is different from the current fixed protective frame of multi-rotor drones. The rotatable method connects the propeller guard 211 to the arm in a distributed arrangement, which reduces the volume and weight of the propeller guard 211 compared to the overall installation method. At the same time, the rotatable method cleverly shrinks the propeller guard 211 into the size of the drone body without increasing the width of the drone body, which is convenient for transportation.

[0052] In the description of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0054] In this utility model, unless otherwise explicitly specified and limited, the terms "assembly," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0055] The above are merely preferred embodiments of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should be considered within its protection scope.

Claims

1. A protective device for a multi-rotor unmanned aerial vehicle (UAV), characterized in that, It includes a blade guard assembly (210), a guard power assembly (220), and a guard rotation assembly (230). Each rotor is equipped with two blade guard assemblies (210); each blade guard assembly (210) is rotatably mounted on the rotor motor via a guard rotation assembly (230); Each of the blade guard assemblies (210) is connected to the guard power assembly (220); the guard power assembly (220) is used to drive the blade guard assembly (210) to rotate between an extended position and a retracted position; in the extended position, the blade guard assembly (210) is located outside the rotor to provide protection, and in the retracted position, the blade guard assembly (210) is located inside the rotor to reduce the width of the UAV.

2. The multi-rotor UAV protection device according to claim 1, characterized in that, The protective frame rotating assembly (230) includes a first rotating assembly and a second rotating assembly; the first rotating assembly includes a rotating shaft (234) and a bushing (235), the rotating shaft (234) is located at the bottom of the rotor motor (202), and the bushing (235) is sleeved on the rotating shaft (234) and connected to the bottom of the blade protective frame assembly (210).

3. The multi-rotor UAV protection device according to claim 2, characterized in that, The second rotating assembly includes hexagonal head bolts (231), ball bearing sleeves (232), and frame supports (233); multiple frame supports (233) are fastened to the periphery of the motor (202); each frame support (233) is equipped with two ball bearing sleeves (232), which are respectively fixed to the frame support (233) by corresponding hexagonal head bolts (231); the blade guard assembly (210) is surrounded on the corresponding ball bearing sleeves (232).

4. The multi-rotor unmanned aerial vehicle (UAV) protection device according to claim 1, 2, or 3, characterized in that, The protective frame power assembly (220) includes a motor mounting plate (221), a linear motor (222), and a linear push rod assembly (223); the upper end of the motor mounting plate (221) is fastened to the arm (204) of the UAV, and the linear motor (222) is fastened to the motor mounting plate (221); the linear motor (222) is movably connected to the propeller protective frame assembly (210) through the linear push rod assembly (223).

5. The multi-rotor UAV protection device according to claim 4, characterized in that, The linear push rod assembly (223) includes a connecting plate (2231) and two linear push rods (2232). The connecting plate (2231) is located at the telescopic end of the linear motor (222). One end of each of the two linear push rods (2232) is fastened to the connecting plate (2231), and the other end is provided with a rectangular groove (2233). The bottom of the blade guard frame assembly (210) is provided with a boss (2234), which is located in the rectangular groove (2233).

6. The multi-rotor unmanned aerial vehicle (UAV) protection device according to claim 1, 2, or 3, characterized in that, The blade guard assembly (210) is a blade guard assembly (210) made of lightweight alloy and is hollow.

7. A multi-rotor unmanned aerial vehicle (UAV), comprising a fuselage assembly (100) and arm assemblies (200), wherein the arm assemblies (200) are mounted on the left and right sides of the fuselage assembly (100); characterized in that, The arm assembly (200) is also provided with a multi-rotor unmanned aerial vehicle protection device as described in any one of claims 1-6.

8. The multi-rotor UAV according to claim 7, characterized in that, The fuselage assembly (100) includes an end guard (101), a body frame (102), and a tripod (103). The end guard (101) is located at the front and rear ends of the body frame (102), and the tripod (103) is located below the body frame (102).

9. The multi-rotor UAV according to claim 8, characterized in that, The airframe (102) is also equipped with a battery pack (104), a power management module (105), and a flight control module (106).

10. The multi-rotor unmanned aerial vehicle according to claim 7, 8, or 9, characterized in that, The arm assembly includes a blade (201), a motor (202), a motor mounting base (203), and an arm (204); the blade (201) is mounted on the motor (202), the motor (202) is mounted on the motor mounting base (203), and the motor mounting base (203) is connected to the body frame (102) through the arm (204).

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