Ducted multi-rotor unmanned aerial vehicle with protection mechanism

Abstract

The application discloses a ducted multi-rotor unmanned aerial vehicle with a protection mechanism and relates to the technical field of unmanned aerial vehicles.The unmanned aerial vehicle comprises a body and a duct, the body and the duct are respectively provided with a mounting frame and an assembling frame, the mounting frame and the assembling frame are in sliding connection, the assembling frame is internally provided with a positioning block and a spring which are connected with each other, and the inner wall of the mounting frame is provided with a positioning hole which is matched with the outer end of the positioning block.The mounting frame of the body and the assembling frame of the duct are matched, the duct and the body are in sliding connection, the assembling frame is internally provided with the positioning block and the spring, the mounting frame is provided with the positioning hole, when a single set of duct fans collide and fail, the pressing plate can be pressed to release the clamping and constraint of the positioning block and the positioning hole, the failed duct and the fans can be individually detached from the body for replacement, the whole machine does not need to be taken offline for maintenance, the problem that the whole machine needs to be taken offline for maintenance and the task schedule is delayed after the damage of the integrated structure machine model single set of ducts is solved, the time consumption for failure disposal can be shortened, and the equipment operation and maintenance investment is reduced.

Description

Technical Field

[0001] This invention relates to the field of unmanned aerial vehicle (UAV) technology, specifically to a ducted multi-rotor UAV with a protective mechanism. Background Technology

[0002] In special operations scenarios such as tactical reconnaissance, close-range surveillance of urban streets and alleys, and inspection of confined spaces, the EDF quadcopter ducted fan UAV is a widely used low-altitude operational equipment. This type of UAV is equipped with a ring-shaped duct shell for each power fan, with the fan blades arranged inside the duct shell. The duct only covers the outer edge of the blades, with a through airflow channel reserved at the front and rear to ensure normal air intake and exhaust to generate flight thrust. Compared with conventional multi-rotor UAVs with exposed blades, the duct shell can constrain the airflow at the blade tips, reduce eddy current losses, improve aerodynamic efficiency to a certain extent, and reduce flight noise and infrared signature. The ring shell can shield the high-speed rotating blades, reducing the risk of blades scraping against walls, branches, or accidentally injuring personnel when flying in densely populated areas or complex obstacle environments. It has stronger environmental adaptability and is often used for tasks such as front-line reconnaissance and emergency inspection.

[0003] Most existing EDF ducted multi-rotor UAVs of the same type adopt an integrated assembly structure. The fuselage and arms are fixedly connected to each duct shell. The fans, drive motors, and ESC circuits inside the ducts are integrated and locked with the fuselage. After the entire unit is assembled at the factory, multiple ducts and the fuselage form an integral unit. During operation, multiple duct fans operate synchronously to provide lift and attitude control. The duct shells provide external protection for the blades, meeting the requirements for safe low-altitude close-range flight. The integrated structure has good overall rigidity and stable factory assembly consistency, making it a common manufacturing solution for current tactical reconnaissance ducted multi-rotor UAVs.

[0004] However, when these ducted fan drones navigate through complex areas such as buildings and jungles, the ducted fans are prone to collisions with debris and branches, which can lead to localized malfunctions such as broken fan blades, stuck motors, and cracked duct casings. Due to the limitations of the integrated structure, if a single ducted fan is damaged, the entire drone needs to be taken off the production line for comprehensive disassembly and repair, or even the entire drone needs to be replaced. In emergency scenarios where the mission is urgent and operations cannot be interrupted for an extended period, the need for complete overhaul and replacement can significantly delay the mission, resulting in poor operational continuity and high overall equipment maintenance costs, making it difficult to meet the practical needs of rapid repair and quick return to flight. Summary of the Invention

[0005] The purpose of this invention is to provide a ducted multi-rotor unmanned aerial vehicle with a protective mechanism to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a ducted multi-rotor unmanned aerial vehicle with a protective mechanism, comprising a fuselage and a duct, wherein a mounting frame and an assembly frame are respectively installed on the outer walls of the fuselage and the duct, the mounting frame and the assembly frame are slidably connected, and a positioning block and a spring connected to each other are installed inside the assembly frame, the inner wall of the mounting frame is provided with a positioning hole adapted to the outer end of the positioning block, and a pressure plate adapted to the positioning block is slidably installed on the mounting frame;

[0007] The mounting frame is equipped with a connector, and the end of the mounting frame is provided with an interface that matches the connector. The mounting frame and the duct are provided with a protective mechanism, which includes a protective plate that is rotatably installed on the inner wall of the bottom of the duct and is attached to the support frame provided at the bottom of the duct, and a sealing plate that is rotatably installed on the end face of the mounting frame and covers the interface. When the duct is removed and placed, its head is turned to face downward. A magnet is installed on the outer wall of the protective plate, and a rotating ring is rotatably installed inside the duct. A magnet is installed on the rotating ring. A magnet is installed on the rotating ring. Magnets A and B repel each other magnetically and attract each other magnetically.

[0008] The assembly frame and duct are equipped with actuators for controlling the position of the rotating ring and sealing plate.

[0009] Preferably, the mounting frame has an assembly slot adapted to the assembly frame, the assembly frame is slidably connected to the mounting frame through the assembly slot, and the opening of the assembly slot is designed to open outward.

[0010] Preferably, multiple positioning blocks are evenly spaced within the assembly frame, and the multiple positioning blocks are interconnected. The top corners of the positioning blocks are designed at an angle to match the openings of the assembly slot and the positioning holes.

[0011] Preferably, after the pressure plate slides into the mounting bracket, the inner end of the pressure plate is located in the positioning hole, and the inner end face is on the same plane as the inner wall of the assembly groove.

[0012] The thickness of the pressure plate is less than the diameter of the positioning block, and the outer end of the pressure plate is located outside the assembly frame.

[0013] Preferably, a limiting plate is rotatably installed at the middle of the inner end of the pressure plate, and the length of the limiting plate is greater than the radius of the positioning hole, and the width of the limiting plate is greater than the thickness of the pressure plate.

[0014] The mounting bracket is provided with a sliding groove that matches the thickness of the inner end of the pressure plate and the width of the limiting plate, and the inner wall of the mounting bracket is provided with a limiting groove that matches the limiting plate. The limiting groove is connected to the positioning hole and is located outside the positioning hole.

[0015] A rotating plate is rotatably mounted at the middle of the outer end of the pressure plate and is coaxially connected to the limiting plate, and the installation angle of the rotating plate is offset from that of the limiting plate by 90°.

[0016] Preferably, multiple protective plates are installed at equal angles on the inner wall of the culvert, and the outer wall of the protective plate is designed with an arc surface corresponding to the shape of the inner wall of the culvert.

[0017] When the protective plate is unfolded, its outer wall is in contact with the inner wall of the culvert; when closed, the end face of the protective plate is in contact with the support frame, which is used to protect the fan in the culvert.

[0018] Preferably, the inner wall of the rotating ring is provided with multiple sets of magnets two and three that are adapted to the magnet one on the outer wall of the protective plate at equal angles, and the outer wall of the rotating ring is provided with protrusions that are slidably connected to the duct, and the duct is provided with rotating grooves that are adapted to the protrusions, in order to limit the extreme rotation angle of the rotating ring.

[0019] The outer wall of the assembly frame is equipped with a torsion spring adapted to the sealing plate to ensure that the sealing plate can cover the interface.

[0020] Preferably, the driver includes a gear one and a gear two coaxially mounted on the mounting frame, and a toothed groove formed on the inner wall of the outer end of the mounting frame and meshing with the gear two. The gear one and the gear two are located inside the mounting frame and at the bottom of the mounting frame, respectively.

[0021] The diameter of gear two is smaller than the diameter of gear one.

[0022] Preferably, the driver further includes a force-bearing plate fixedly installed at the bottom of the sealing plate and a force-bearing wheel installed at the end of the force-bearing plate, wherein the outer wall of the force-bearing plate protrudes from the outer wall of the sealing plate, and the outer side of the force-bearing wheel protrudes from the force-bearing plate;

[0023] The inner wall of the mounting frame is fitted with a baffle that is compatible with the force-bearing wheel, and the outer corner of the baffle is chamfered. The end of the assembly frame is provided with a clearance groove that is compatible with the baffle, and the length of the baffle is greater than the sum of the length of the interface and the length of the sealing plate.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. This invention achieves a sliding connection between the duct and the machine body through a mounting bracket for the machine body and a mounting bracket for the duct. The mounting bracket is equipped with positioning blocks and springs, and the mounting bracket has positioning holes. When a single duct fan experiences a collision failure, pressing the pressure plate can release the locking constraint between the positioning block and the positioning hole, allowing the faulty duct and fan to be removed and replaced separately from the machine body. This eliminates the need for the entire machine to be taken offline for maintenance, alleviating the problem of the entire machine being taken offline for repair and delaying the task progress when a single duct of an integrated structure model is damaged. It can shorten the time spent on fault handling and reduce equipment operation and maintenance investment.

[0026] 2. This invention, by opening an assembly slot on the mounting bracket with the slot opening opening outwards, and setting an angled corner on the top edge of the positioning block, allows the angled corner of the positioning block to compress the spring along the inclined surface of the assembly slot opening during the process of the mounting bracket sliding into the assembly slot. After the assembly is in place, the spring pushes the positioning block into the positioning hole to complete the locking. The assembly process does not require additional alignment of the positioning structure, simplifying the disassembly and assembly steps of the ducted fan and the machine body, and reducing the difficulty of the assembly operation.

[0027] 3. This invention involves rotating and installing a protective plate at the bottom of the duct, and setting a sealing plate that matches the interface on the end face of the assembly frame. When the duct is removed and placed, it is turned so that the head is facing down. At this time, the protective plate is kept in contact with the support frame by the magnetic attraction and repulsion of magnet one and magnet two, which reduces the damage to components such as the fan caused by debris falling into the duct. At the same time, the sealing plate will cover the interface, reducing the entry of debris into the interface during storage and reducing the probability of damage to the joints, interfaces and internal parts of the duct.

[0028] 4. This invention, by providing a driver that is compatible with the assembly frame and the ducted fan, can control the position of the rotating ring and the sealing plate. Because the rotating ring is equipped with magnets two and three, it can change the force state of magnet one, thereby adjusting the opening and closing angle of the protective plate. The working state of the protective plate can be switched according to the two working conditions of flight and storage, adapting to the protection needs of different usage scenarios. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a cross-sectional view of the mounting frame and assembly frame of the present invention;

[0031] Figure 3 For the present invention Figure 2 A structural diagram after removing the mounting bracket, assembly bracket, and duct;

[0032] Figure 4 This is a schematic diagram of the mounting bracket and gear one, gear two, and tooth groove of the present invention;

[0033] Figure 5 For the present invention Figure 2 A magnified structural diagram of point A in the middle;

[0034] Figure 6 This is a schematic diagram of the structure of the present invention after the pre-fitting limiting plate is inserted into the limiting groove;

[0035] Figure 7 For the present invention Figure 6 A schematic diagram of the structure after the mounting bracket has been cut open.

[0036] Figure 8This is a schematic diagram of the structure of the pressure plate, limiting plate and rotating plate of the present invention;

[0037] Figure 9 This is a schematic diagram of the structure of the assembly frame and duct after they have been removed and placed.

[0038] Figure 10 This is a schematic diagram of the protective plate of the present invention when it is closed.

[0039] In the diagram: 1. Body; 2. Mounting bracket; 21. Assembly slot; 3. Assembly bracket; 31. Positioning block; 32. Spring; 33. Positioning hole; 4. Duct; 41. Support frame; 5. Pressure plate; 51. Limiting plate; 52. Angle limiting groove; 53. Rotating plate; 6. Connector; 7. Interface; 8. Protective plate; 81. Rotary ring; 82. Magnet one; 83. Magnet two; 84. Magnet three; 85. Sealing plate; 9. Gear one; 91. Gear two; 92. Gear groove; 93. Force plate; 94. Force wheel; 95. Baffle; 96. Clearance groove. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Please see Figures 1-10 The present invention provides the following technical solution: a ducted multi-rotor unmanned aerial vehicle (UAV) with a protective mechanism, comprising a body 1 and a duct 4, wherein a mounting frame 2 and an assembly frame 3 are respectively mounted on the outer walls of the body 1 and the duct 4, the mounting frame 2 and the assembly frame 3 are slidably connected, and a positioning block 31 and a spring 32 connected to each other are installed inside the assembly frame 3; a positioning hole 33 adapted to the outer end of the positioning block 31 is opened on the inner wall of the mounting frame 2, and a pressure plate 5 adapted to the positioning block 31 is slidably mounted on the mounting frame 2; a connector 6 is installed inside the mounting frame 2, and an interface 7 adapted to the connector 6 is provided at the end of the assembly frame 3; the connector 6 and the interface 7 are electrically connected, and the assembly frame 3 and the duct The duct 4 is equipped with a protective mechanism, which includes a protective plate 8 rotatably mounted on the inner wall of the bottom of the duct 4 and attached to the support frame 41 provided at the bottom of the duct 4, and a sealing plate 85 rotatably mounted on the end face of the assembly frame 3 and covering the interface 7. When the duct 4 is removed and placed, its head is turned to face downward. A magnet 82 is installed on the outer wall of the protective plate 8. A rotating ring 81 is rotatably mounted inside the duct 4. A magnet 83 and a magnet 84 are installed on the rotating ring 81. The magnet 82 and the magnet 83 are magnetically repelled, while the magnet 82 and the magnet 84 are magnetically attracted. The assembly frame 3 and the duct 4 are equipped with a driver for controlling the position of the rotating ring 81 and the sealing plate 85.

[0042] In a preferred embodiment of the present invention, the mounting frame 2 is provided with an assembly groove 21 that is adapted to the assembly frame 3. The assembly frame 3 is slidably connected to the mounting frame 2 through the assembly groove 21, and the opening of the assembly groove 21 is designed to open outward. Multiple positioning blocks 31 are provided at equal intervals in the assembly frame 3. The multiple positioning blocks 31 are connected to each other, and the top corners of the positioning blocks 31 are designed to be angled to match the opening of the assembly groove 21 and the opening of the positioning hole 33.

[0043] When assembling the mounting frame 3, push the mounting frame 3 into the mounting groove 21. During this process, the opening of the mounting groove 21 will contact the positioning block 31. Then guide the positioning block 31 to move towards the spring 32 to ensure that the mounting frame 3 can smoothly enter the mounting groove 21. After the mounting frame 3 is pushed into place, the positioning block 31 enters the positioning hole 33 under the action of the spring 32, which restricts the connection between the mounting frame 2 and the mounting frame 3.

[0044] In a preferred embodiment of the present invention, after the pressure plate 5 slides into the mounting frame 2, the inner end of the pressure plate 5 is located in the positioning hole 33, and the inner end face is on the same plane as the inner wall of the assembly groove 21; the thickness of the pressure plate 5 is less than the diameter of the positioning block 31, and the outer end of the pressure plate 5 is located outside the mounting frame 3; a limiting plate 51 is rotatably installed in the middle of the inner end of the pressure plate 5, and the length of the limiting plate 51 is greater than the radius of the positioning hole 33, and the width of the limiting plate 51 is greater than the thickness of the pressure plate 5; a sliding groove adapted to the thickness of the inner end of the pressure plate 5 and the width of the limiting plate 51 is provided on the mounting frame 2, and an angle limiting groove 52 adapted to the limiting plate 51 is provided in the inner wall of the mounting frame 2, the angle limiting groove 52 is connected to the positioning hole 33 and located outside the positioning hole 33; a rotating plate 53 coaxially connected to the limiting plate 51 is rotatably installed in the middle of the outer end of the pressure plate 5, and the installation angle of the rotating plate 53 is offset from that of the limiting plate 51 by 90°;

[0045] When assembling the assembly frame 3, the pressure plate 5 can be in two states. One is suitable for quick assembly operations, where you only need to keep pressing the pressure plate 5 to ensure the position of the pressure plate 5 is certain. The other is that after pressing the pressure plate 5 to the bottom, rotate the rotating plate 53 to make the limiting plate 51 rotate into the limiting angle groove 52 and stick to the inner wall of the limiting angle groove 52, so that the limiting plate 51 cannot move up or down.

[0046] As a preferred embodiment of the present invention, multiple protective plates 8 are installed at equal angles on the inner wall of the culvert 4, and the outer wall of the protective plate 8 is designed with an arc surface corresponding to the shape of the inner wall of the culvert 4.

[0047] When in use, the protective plate 8 is attached to the inner wall of the duct 4 to prevent the protective plate 8 from seriously affecting subsequent use. When the duct 4 is removed, the protective plate 8 is closed so that the end face of the protective plate 8 is attached to the support frame 41 to protect the fan in the duct 4.

[0048] In a preferred embodiment of the present invention, the inner wall of the rotating ring 81 is provided with multiple sets of magnets 83 and 84 that are adapted to the magnets 82 on the outer wall of the protective plate 8 at equal angles, and the outer wall of the rotating ring 81 is provided with a protrusion that is slidably connected to the duct 4. The duct 4 is provided with a rotating groove that is adapted to the protrusion to limit the extreme rotation angle of the rotating ring 81; a torsion spring adapted to the sealing plate 85 is installed on the outer wall of the assembly frame 3.

[0049] When in use, the protective plate 8 is restricted in position by the action of magnet 1 82 and magnet 3 84, and is in a state of being attached to the inner wall of the duct 4. When the duct 4 is removed, the protective plate 8 is in a state of being attached to the support frame 41 by the action of magnet 1 82 and magnet 2 83, while the sealing plate 85 is in a state of blocking the interface 7 by the action of the torsion spring.

[0050] In a preferred embodiment of the present invention, the driver includes a first gear 9 and a second gear 91 coaxially mounted on the mounting frame 3, and a toothed groove 92 formed on the inner wall of the outer end of the mounting frame 2 and meshing with the second gear 91. The first gear 9 and the second gear 91 are located inside the mounting frame 3 and at the bottom of the mounting frame 3, respectively. The diameter of the second gear 91 is smaller than the diameter of the first gear 9.

[0051] During the sliding process of the assembly frame 3, the second gear 91 will move along the tooth groove 92, causing the second gear 91 to drive the first gear 9 to rotate, which in turn causes the first gear 9 to drive the rotating ring 81 to rotate, thereby adjusting the position of the second magnet 83 and the third magnet 84.

[0052] In a preferred embodiment of the present invention, the driver further includes a force plate 93 fixedly installed at the bottom of the sealing plate 85 and a force wheel 94 installed at the end of the force plate 93, wherein the outer wall of the force plate 93 protrudes from the outer wall of the sealing plate 85, and the outer side of the force wheel 94 protrudes from the force plate 93; a baffle 95 adapted to the force wheel 94 is installed on the inner wall of the mounting frame 2, and the outer corner of the baffle 95 is chamfered; an avoidance groove 96 adapted to the baffle 95 is opened at the end of the mounting frame 3, and the length of the baffle 95 is greater than the sum of the length of the interface 7 and the length of the sealing plate 85;

[0053] After the assembly frame 3 enters the assembly slot 21, the end corner of the baffle 95 will contact the force wheel 94. As the assembly frame 3 continues to slide, the force wheel 94 will be forced to swing under the action of the baffle 95 through the force plate 93 to overcome the action of the torsion spring and expose the interface 7, ensuring that the connector 6 can be smoothly inserted into the interface 7.

[0054] Working principle: When using this ducted multi-rotor UAV with a protective mechanism, the outer wall of the mounting frame 3 is always in contact with the inner wall of the mounting groove 21. The mounting frame 2 supports the mounting frame 3 to ensure the stability of the mounting frame 3 and the duct 4 during use. Multiple sets of positioning blocks 31 are located in the corresponding positioning holes 33 under the action of springs 32, locking the position of the mounting frame 3 on the mounting frame 2. At the same time, the top of the positioning block 31 is in contact with the bottom of the pressure plate 5, and the top of the pressure plate 5 protrudes from the top of the mounting frame 2. In this state, the limiting plate 51 is in the sliding groove.

[0055] At the same time, the connector 6 and the interface 7 are in a combined state; while the protective plate 8 is in an unfolded state and is attached to the inner wall of the duct 4. In this state, the magnet 82 on the outer wall of the protective plate 8 is attached to the magnet 84, and the gear 91 is engaged with the tooth groove 92. In this state, the rotating ring 81 rotates to the limit state on one side to ensure the accuracy of the position of the magnet 82 and the magnet 84.

[0056] When it is necessary to quickly remove the duct 4, press the end face of the pressure plate 5 to move it downward, squeeze the multiple positioning blocks 31, force the positioning blocks 31 to slide towards the spring 32, and squeeze the spring 32 to separate the positioning blocks 31 from the positioning holes 33. At this time, the restriction of the positioning blocks 31 and the positioning holes 33 on the assembly frame 3 is released. Then, pull the assembly frame 3 outward directly to make the assembly frame 3 slide out of the assembly slot 21.

[0057] During the sliding out of the assembly frame 3, the gear 2 91 will move along the tooth groove 92, causing the gear 2 91 to drive the gear 1 9 to rotate, which in turn causes the magnet 2 83 and the magnet 3 84 to rotate, separating the magnet 3 84 from the magnet 1 82. This allows the magnet 2 83 to rotate to a position corresponding to the position of the magnet 1 82. At this time, the magnet 1 82, under the action of the magnet 2 83, drives the protective plate 8 to swing away from the rotating ring 81. After the assembly frame 3 is completely removed, the duct 4 is flipped so that the head is facing down, causing multiple sets of protective plates 8 to swing to a state of contact with the support frame 41 under the action of the magnet 1 82, the magnet 2 83, and their own gravity. The multiple sets of protective plates 8 cooperate to form a protective shell, which protects the fan located below the protective plate 8 at this time, preventing items from falling and damaging the components below the protective plate 8.

[0058] As the assembly frame 3 begins to slide outward from the mounting frame 2, it gradually moves away from the baffle 95, thereby separating the connector 6 from the interface 7. Subsequently, the baffle 95 will separate from the clearance groove 96 and the force wheel 94. At this time, the sealing plate 85 loses its restraint and swings under the action of the torsion spring to cover the interface 7, preventing the interface 7 from being directly exposed after removal and allowing debris to enter the interface 7.

[0059] When reassembling the assembly frame 3, there are two options: one is to continuously press the pressure plate 5 to ensure the position of the inner end of the pressure plate 5, which is suitable for quick assembly; the other is to first press the pressure plate 5 to the bottom, and then rotate the rotating plate 53 so that the limiting plate 51 rotates into the limiting groove 52 and is in contact with the inner wall of the limiting groove 52, so that the limiting plate 51 cannot move up and down, thereby determining the position of the pressure plate 5.

[0060] After the pressure plate 5 is fixed in position, the assembly frame 3 is directly pushed into the assembly slot 21. During this process, the opening of the assembly slot 21 will contact the positioning block 31, and then guide the positioning block 31 to move towards the spring 32, ensuring that the assembly frame 3 can smoothly enter the assembly slot 21. As the assembly frame 3 slides into the assembly slot 21, the pressure plate 5 is provided in the positioning hole 33 at this time, so that the positioning block 31 cannot enter the positioning hole 33, thereby ensuring that the assembly frame 3 can smoothly move to the designated position.

[0061] As the assembly frame 3 gradually enters the assembly slot 21, the end corner of the baffle 95 contacts the force wheel 94. As the assembly frame 3 continues to slide, the force wheel 94 is forced to swing under the action of the baffle 95 through the force plate 93, which drives the sealing plate 85 to overcome the action of the torsion spring, thus exposing the interface 7. Then the baffle 95 will slide into the clearance slot 96. As the assembly frame 3 continues to go deeper, the connector 6 begins to be inserted into the interface 7. When the assembly frame 3 is about to slide into place, the gear 2 91 will slide to the state of meshing with the tooth groove 92.

[0062] As the assembly frame 3 continues to move deeper, the gear 2 91 drives the gear 1 9 to rotate under the action of the tooth groove 92, causing the rotating ring 81 to rotate again to the state where the magnet 3 84 corresponds to the magnet 1 82. Under the action of magnetic attraction, the magnet 1 82 drives the protective plate 8 to rotate to the state where the magnet 3 84 attracts each other.

[0063] After the assembly frame 3 is pushed into place, the restriction on the pressure plate 5 is released, allowing the pressure plate 5 to move up and down. At this time, the positioning block 31 enters the positioning hole 33 under the action of the spring 32 and pushes the pressure plate 5 upward. The positioning block 31 will cooperate with the positioning hole 33 to restrict the connection between the mounting frame 2 and the assembly frame 3, ensuring the fixation of the connection between the assembly frame 3 and the mounting frame 2 after assembly.

[0064] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A ducted multi-rotor unmanned aerial vehicle with a protective mechanism, comprising a fuselage (1) and a duct (4), characterized in that: The outer walls of the body (1) and the duct (4) are respectively equipped with mounting bracket (2) and assembly bracket (3). The mounting bracket (2) and assembly bracket (3) are slidably connected. The assembly bracket (3) is equipped with a positioning block (31) and a spring (32) that are connected to each other. The inner wall of the mounting bracket (2) is provided with a positioning hole (33) that is adapted to the outer end of the positioning block (31). The mounting bracket (2) is slidably equipped with a pressure plate (5) that is adapted to the positioning block (31). The mounting frame (2) is equipped with a connector (6), the end of the assembly frame (3) is provided with an interface (7) that is compatible with the connector (6), and the assembly frame (3) and the duct (4) are provided with a protective mechanism, which includes a protective plate (8) that is rotatably installed on the inner wall of the bottom of the duct (4) and attached to the support frame (41) provided at the bottom of the duct (4), and a sealing plate (85) that is rotatably installed on the end face of the assembly frame (3) and covers the interface (7). When the duct (4) is removed and placed, its head is turned to face downward. A magnet (82) is installed on the outer wall of the protective plate (8), and a rotating ring (81) is rotatably installed inside the duct (4). A magnet (83) and a magnet (84) are installed on the rotating ring (81). The magnet (82) and the magnet (83) are magnetically repelled, and the magnet (84) is magnetically attracted. The assembly frame (3) and duct (4) are equipped with drivers for controlling the position of the rotating ring (81) and the sealing plate (85).

2. A ducted multi-rotor UAV with a protection mechanism according to claim 1, characterized in that: The mounting bracket (2) has an assembly slot (21) adapted to the assembly bracket (3). The assembly bracket (3) is slidably connected to the mounting bracket (2) through the assembly slot (21), and the opening of the assembly slot (21) is designed to open outward.

3. A ducted multi-rotor UAV with a protection mechanism according to claim 1, characterized in that: The positioning blocks (31) are provided at equal intervals in the assembly frame (3). The positioning blocks (31) are connected to each other, and the top corners of the positioning blocks (31) are designed to be angled to match the opening of the assembly groove (21) and the opening of the positioning hole (33).

4. A ducted multi-rotor UAV with a protection mechanism according to claim 2, characterized in that: After the pressure plate (5) slides into the mounting bracket (2), the inner end of the pressure plate (5) is located in the positioning hole (33), and the inner end face is on the same plane as the inner wall of the assembly groove (21); The thickness of the pressure plate (5) is less than the diameter of the positioning block (31), and the outer end of the pressure plate (5) is located outside the assembly frame (3).

5. A ducted multi-rotor UAV with a protection mechanism according to claim 1, characterized in that: A limiting plate (51) is rotatably installed in the middle of the inner end of the pressure plate (5), and the length of the limiting plate (51) is greater than the radius of the positioning hole (33), and the width of the limiting plate (51) is greater than the thickness of the pressure plate (5). The mounting bracket (2) is provided with a sliding groove that matches the thickness of the inner end of the pressure plate (5) and the width of the limiting plate (51), and the inner wall of the mounting bracket (2) is provided with a limiting groove (52) that matches the limiting plate (51). The limiting groove (52) is connected to the positioning hole (33) and is located outside the positioning hole (33). The pressure plate (5) is rotatably mounted at the middle of its outer end with a rotating plate (53) coaxially connected to the limiting plate (51), and the installation angle of the rotating plate (53) is 90° off from that of the limiting plate (51).

6. A ducted multi-rotor UAV with a protection mechanism according to claim 1, characterized in that: Multiple protective plates (8) are installed at equal angles on the inner wall of the culvert (4), and the outer wall of the protective plate (8) is designed with an arc surface corresponding to the shape of the inner wall of the culvert (4); When the protective plate (8) is unfolded, its outer wall is attached to the inner wall of the culvert (4), and when it is closed, the end face of the protective plate (8) is attached to the support frame (41), which is used to protect the fan in the culvert (4).

7. A ducted multi-rotor UAV with a protection mechanism according to claim 1, characterized in that: The inner wall of the rotating ring (81) is provided with multiple sets of magnets (83) and magnets (84) that are compatible with magnet one (82) on the outer wall of the protective plate (8). The outer wall of the rotating ring (81) is provided with protrusions that are slidably connected to the duct (4). The duct (4) is provided with rotating grooves that are compatible with the protrusions, which are used to limit the extreme rotation angle of the rotating ring (81). The outer wall of the assembly frame (3) is fitted with a torsion spring that is compatible with the sealing plate (85) to ensure that the sealing plate (85) can cover the interface (7).

8. A ducted multi-rotor UAV with a protection mechanism according to claim 1, characterized in that: The drive includes a gear 1 (9) and a gear 2 (91) coaxially mounted on the mounting frame (3), and a toothed groove (92) opened on the inner wall of the outer end of the mounting frame (2) and meshing with the gear 2 (91). The gear 1 (9) and the gear 2 (91) are located inside the mounting frame (3) and at the bottom of the mounting frame (3), respectively. The diameter of gear 2 (91) is smaller than the diameter of gear 1 (9).

9. A ducted multi-rotor UAV with a protection mechanism according to claim 1, characterized in that: The driver also includes a force plate (93) fixedly installed at the bottom of the sealing plate (85) and a force wheel (94) installed at the end of the force plate (93), with the outer wall of the force plate (93) protruding from the outer wall of the sealing plate (85) and the outer side of the force wheel (94) protruding from the force plate (93). The inner wall of the mounting bracket (2) is fitted with a baffle (95) that is compatible with the force-bearing wheel (94), and the outer corner of the baffle (95) is chamfered. The end of the assembly bracket (3) is provided with a clearance groove (96) that is compatible with the baffle (95), and the length of the baffle (95) is greater than the sum of the length of the interface (7) and the length of the sealing plate (85).

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