A low-altitude drone

Abstract

This invention discloses a low-altitude unmanned aerial vehicle (UAV), belonging to the field of UAV technology, comprising: a fuselage body with two threaded holes at each of its four corners; four arms, each arm having a connecting end with two circular holes at one end, which are fastened to the threaded holes of the fuselage body by two screws; a power mounting end at the other end of each arm; four power components, respectively mounted on the power mounting ends of the four arms; and a load-bearing component, including a drive gear assembly disposed on the fuselage body, the drive gear assembly being meshed with an internal gear ring, the internal gear ring having several threaded holes, a screw connected to the threaded holes, and a mounting plate at the end of the screw for mounting at least one of a camera, a cargo compartment, and a buffer component. This invention can overcome limitations in shooting direction, improve cargo carrying capacity, enhance crash protection, and has a simple structure and strong practicality.

Description

Technical Field

[0001] This invention belongs to the field of unmanned aerial vehicle (UAV) technology, and particularly relates to a low-altitude UAV. Background Technology

[0002] With the rapid development of the low-altitude economy, low-altitude drones are increasingly used in various fields such as photography, videography, material transportation, and leisure and entertainment. The market is placing higher demands on the functionality, practicality, and safety of drones. However, current low-altitude drones on the market still face many technical bottlenecks, making it difficult to meet the needs of multi-scenario use. Specific shortcomings are as follows: First, in terms of shooting capabilities, the shooting direction of existing drones is severely limited. Their shooting actions mainly rely on the tilt adjustment of the camera's own gimbal. Most models can only shoot downwards. Even some high-end models can achieve a certain angle of pitch adjustment, but due to the mechanical angle of the gimbal and the design of the body structure, they cannot achieve effective shooting from diagonally above or directly above. It is difficult to capture scenes above such as fireworks, birds flying high in the sky, and kites flying in the air, which greatly limits the photography application scenarios of drones and reduces their use value and creative potential.

[0003] Secondly, regarding cargo-carrying capabilities, existing low-altitude drones either lack cargo-carrying capacity or can only carry a small number of lightweight items, resulting in limited cargo capacity and poor cargo stability. On the one hand, the lack of a dedicated cargo-carrying structure design prevents the simultaneous carrying of multiple items; on the other hand, unreasonable cargo-carrying point layouts can easily cause the drone's center of gravity to shift, affecting flight stability and even leading to flight accidents. This makes it difficult to meet practical needs such as transporting small goods and carrying multiple items, thus restricting the application and expansion of drones in logistics and other fields.

[0004] Finally, regarding safety, the existing drone crash protection design is inadequate, especially in terms of protection against inverted crashes. During flight, drones are prone to crashes due to factors such as operational errors, airflow interference, and equipment malfunctions. In the event of an inverted crash (i.e., the drone falls top-down), the main body, power components, and onboard cameras will directly collide with the ground, easily causing damage to the fuselage and core components. This not only increases the user's operating costs but also reduces the drone's safety and lifespan.

[0005] In view of the shortcomings of the existing technologies, there is an urgent need for a low-altitude drone that can overcome the limitations of shooting direction, improve carrying capacity, strengthen crash protection, and has a simple structure and high practicality, so as to solve the deficiencies of the existing technologies and meet the needs of multiple scenarios. Summary of the Invention

[0006] To address the problems existing in the prior art, this invention provides a low-altitude drone that has the advantages of overcoming limitations in shooting direction, increasing payload capacity, strengthening crash protection, and having a simple structure and high practicality, thus solving the problems of the prior art.

[0007] This invention is implemented as follows: a low-altitude unmanned aerial vehicle (UAV) includes: a fuselage body with two threaded holes at each of its four corners; four arms, each arm having a connecting end with two circular holes at one end, which are fastened to the threaded holes of the fuselage body by two screws; a power mounting end at the other end of each arm; four power components, each mounted on the power mounting ends of the four arms; and a load-bearing component, including a drive gear assembly disposed on the fuselage body, the drive gear assembly being meshed with an internal gear ring, the internal gear ring having several threaded holes, a screw connected to the threaded holes, and a mounting plate at the end of the screw for mounting at least one of a camera, a cargo compartment, and a buffer component.

[0008] In a preferred embodiment of the present invention, the drive rack assembly includes a mounting bracket, a motor, and a rack body. The rack body is rotatably mounted on the mounting bracket, the motor is fixedly connected to the end of the mounting bracket, and the end of the rack body is connected to the output shaft of the motor.

[0009] As a preferred embodiment of the present invention, mounting grooves are provided on both sides of the main body. When the drive rack assembly is vertically arranged, the drive rack assembly is vertically installed in the mounting groove. At this time, the inner gear ring is horizontally arranged and meshes with the rack body. The inner gear ring is located on the upper or lower side of the main body.

[0010] As a preferred embodiment of the present invention, the toothed rod body is provided with a slot, and the screw can be inserted into the slot.

[0011] As a preferred embodiment of the present invention, an annular airbag is sleeved on the screw, and at least two through holes are provided on the mounting plate. The annular airbag is connected to at least two strip-shaped airbags, which are respectively located in the two through holes and extend to the other side of the mounting plate.

[0012] As a preferred embodiment of the present invention, it also includes a detachable claw-type landing gear, which is installed below the boom; the boom adopts a hollow truss structure.

[0013] As a preferred embodiment of the present invention, an attitude sensor is provided inside the fuselage body, and the attitude sensor is electrically connected to the motor of the drive gear assembly; the attitude sensor is used to collect pitch angle and roll angle attitude information of the UAV, and automatically control the motor to rotate according to the current flight attitude of the UAV, thereby driving the internal gear ring to rotate, so that the camera on the mounting plate always maintains a horizontal shooting attitude.

[0014] As a preferred embodiment of the present invention, a fall detection sensor is provided inside the fuselage body, and the fall detection sensor is electrically connected to the motor of the drive gear assembly; when the sensor detects that the drone has entered a weightless fall state, the motor immediately drives the internal gear ring to rotate to a protective posture, so that the internal gear ring, the screw and the mounting plate form a ring-shaped protective frame that wraps around the fuselage body.

[0015] As a preferred embodiment of the present invention, the fuselage body is provided with an airspeed sensor or flight speed detection module, which is electrically connected to the motor of the drive gear assembly; when the drone accelerates, decelerates or turns, the motor drives the internal gear ring to rotate, adjusting the center of gravity position of the cargo compartment, so that the overall center of gravity of the drone is always kept at the center of the fuselage.

[0016] As a preferred embodiment of the present invention, obstacle avoidance sensors are provided around the main body of the machine body, and the obstacle avoidance sensors are electrically connected to the motor of the drive gear assembly; when the obstacle avoidance sensor detects an obstacle in a certain direction, the motor drives the internal gear ring to rotate, causing the buffer or screw assembly on the mounting plate to turn towards the obstacle, forming a buffer blocking surface.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Compared with existing technologies, this low-altitude UAV, through its reasonable structural design, effectively solves the technical defects of existing UAVs, such as limited shooting direction, insufficient payload capacity, and poor crash protection, and has the following significant beneficial effects: 1. Breaking through shooting direction limitations and enhancing shooting practicality: Through the meshing transmission between the drive gear assembly and the internal gear ring, the camera can be driven to rotate in multiple directions, which can be flexibly adjusted to any shooting angle such as downward, upward, left and right. It can easily capture scenes such as fireworks, birds, and kites from the upper angle, making up for the shortcomings of existing drones that cannot shoot scenes directly above or from the upper angle. This expands the photography application scenarios of drones, enhances the diversity and practicality of their shooting functions, and meets the shooting needs of different users.

[0018] 2. Enhanced payload capacity and improved flight stability: The internal gear ring has several screw holes, allowing multiple payload compartments to be mounted individually or simultaneously via screws and mounting plates. This significantly increases payload capacity compared to the limited payload of existing drones. Furthermore, the even distribution of these screw holes ensures balanced installation of the payload compartments, effectively preventing the drone's center of gravity from shifting due to payload loads. This ensures flight stability, reduces the risk of flight accidents caused by payload imbalance, and is suitable for scenarios such as transporting small goods and carrying multiple items, expanding the application scope of drones and meeting the development needs of drone logistics.

[0019] 3. Enhanced crash protection and reduced operating costs: The ring structure and installation position design of the internal toothed ring ensure that it makes contact with the ground first in the event of a drone crash. It absorbs the impact force by utilizing its own structural strength and buffering effect, effectively protecting the main body, power components, camera, and cargo compartment. This reduces equipment damage caused by crashes, extends the service life of the drone, and reduces the operating costs incurred by users due to equipment maintenance and replacement, thereby improving the safety and reliability of the drone.

[0020] 4. Simple structure, convenient assembly and strong stability: The arm and the main body are fastened together with two screws to form a rigid connection that cannot be folded. The structure is simple and easy to assemble. At the same time, it improves the connection strength between the arm and the body, prevents the arm from shaking or falling off during flight, and ensures the stability of the UAV flight. The drive gear assembly, internal gear ring, screw and mounting plate of the load-bearing components have a simple structural design, reliable transmission, and are easy to process, manufacture and maintain, reducing production and use costs.

[0021] 5. High integration of functions and adaptability to multiple scenarios: This drone integrates three functions: shooting direction adjustment, multi-item carrying, and crash protection. No additional auxiliary equipment is required. It is comprehensive and highly practical and can be widely used in various low-altitude scenarios such as photography, videography, leisure and entertainment, and small-scale material transportation. It solves the problem of existing drones having single functions and limited adaptability to various scenarios and has high promotional value. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram from a first perspective provided in an embodiment of the present invention; Figure 2 This is provided by the embodiments of the present invention. Figure 1 A magnified structural diagram of part A in the middle; Figure 3 This is a structural schematic diagram from a second perspective provided in an embodiment of the present invention; Figure 4 This is provided by the embodiments of the present invention. Figure 3 A magnified structural diagram of part B in the middle section; Figure 5 This is a structural schematic diagram from a third perspective provided in an embodiment of the present invention; Figure 6 This is provided by the embodiments of the present invention. Figure 5 A cross-sectional view of the CC section; Figure 7 This is provided by the embodiments of the present invention. Figure 6 A magnified structural diagram of section D in the middle; Figure 8 This is a signal connection diagram of the attitude sensor, fall detection sensor, airspeed sensor, and obstacle avoidance sensor provided in the embodiments of the present invention.

[0023] In the diagram: 1. Main fuselage; 2. Arm; 3. Power unit; 4. Internal gear ring; 5. Screw hole; 6. Screw; 7. Mounting plate; 8. Mounting bracket; 9. Motor; 10. Gear body; 11. Mounting groove; 12. Slot; 13. Annular airbag; 14. Through hole; 15. Strip airbag; 16. Claw landing gear; 17. Attitude sensor; 18. Fall detection sensor; 19. Airspeed sensor; 20. Obstacle avoidance sensor. Detailed Implementation

[0024] To further understand the invention's content, features, and effects, the following embodiments are provided, and detailed descriptions are given in conjunction with the accompanying drawings.

[0025] The structure of the present invention will now be described in detail with reference to the accompanying drawings.

[0026] like Figures 1 to 8 As shown, an embodiment of the present invention provides a low-altitude unmanned aerial vehicle (UAV), comprising: a fuselage body 1, wherein the fuselage body 1 has two threaded holes at its four corners; four arms 2, each arm 2 having a connecting end at one end with two round holes, which are fastened to the threaded holes of the fuselage body 1 by two screws; the other end of the arm 2 being a power mounting end; four power components 3, which are respectively installed at the power mounting ends of the four arms 2; and a load-bearing component, including a drive gear assembly disposed on the fuselage body 1, wherein the drive gear assembly is meshed with an internal gear ring 4, the internal gear ring 4 having a plurality of threaded holes 5, wherein a screw 6 is connected to the threaded holes 5, and the end of the screw 6 is provided with a mounting plate 7 for mounting at least one of a camera, a cargo compartment, and a buffer component.

[0027] This low-altitude drone, through the coordinated operation of its main body 1, arms 2, power unit 3, and load-bearing components, achieves shooting direction adjustment, multi-item carrying, and crash protection. Its specific working principle is as follows: 1. Connection principle between fuselage and arm 2: Each of the four corner mounting bases of the arm 2 on the fuselage body 1 has two threaded holes. The connection ends of the four arms 2 have corresponding two round holes. Two screws are used to secure the arm 2 to the threaded holes of the mounting base, forming a rigid, non-foldable connection structure. This rigid connection method enhances the connection strength between the arm 2 and the fuselage body 1, preventing the arm 2 from swaying or detaching during flight, providing structural support for stable UAV flight, and simplifying the connection structure while reducing assembly difficulty.

[0028] 2. Flight power principle: Four power components 3 are respectively installed on the power mounting ends of the four arms 2. When the power components 3 are working, they generate lift and thrust, which drive the UAV to take off, land, hover and adjust its attitude, providing stable power for the UAV's flight, ensuring that the UAV can fly smoothly in the low-altitude area and adapt to a variety of low-altitude operation scenarios.

[0029] 3. Shooting Direction Adjustment Principle: The drive rack assembly in the bearing component meshes with the internal gear ring 4. When the drive rack assembly receives a control signal and rotates, it drives the meshing internal gear ring 4 to rotate synchronously. Since the camera is mounted on the end of the screw 6 via the mounting plate 7, and the screw 6 is connected to the screw hole 5 on the internal gear ring 4, the rotation of the internal gear ring 4 will drive the camera to rotate synchronously, thereby realizing flexible adjustment of the camera's shooting direction—it can drive the internal gear ring 4 to rotate in both forward and reverse directions, allowing the camera to shoot in multiple directions such as downward, upward, left, and right, breaking through the limitation of existing drones that can only shoot downwards, and can flexibly capture scenes from different directions.

[0030] 4. Cargo Loading Principle: The internal gear ring 4 has several screw holes 5, each of which can be connected to a screw rod 6. The mounting plate 7 at the end of the screw rod 6 can be used to mount cargo compartments individually or simultaneously. The screw holes 5 are evenly distributed on the internal gear ring 4. When multiple cargo compartments are mounted, their installation positions can be rationally allocated according to the weight and volume of the cargo, keeping the drone's center of gravity balanced and preventing center of gravity shift due to cargo loading. This ensures the drone's flight stability and allows for the simultaneous loading of multiple cargo items, improving cargo carrying capacity.

[0031] 5. Crash Protection Principle: The internal gear ring 4 in the load-bearing component has a ring structure and encloses the main body 1. Its overall height is higher than the main body 1 and the power unit 3. When the drone crashes, regardless of whether the crash attitude is upright (bottom of the fuselage facing down) or upside down (top of the fuselage facing down), the internal gear ring 4 will contact the ground first. Utilizing the structural strength of the internal gear ring 4 and the buffering effect of the screw 6 and mounting plate 7, the impact force of the crash is absorbed, preventing the main body 1, power unit 3, camera, and cargo compartment from directly colliding with the ground. This achieves all-round crash protection and reduces equipment damage caused by the crash.

[0032] Specifically, the drive rack assembly includes a mounting frame 8, a motor 9, and a rack body 10. The rack body 10 is rotatably mounted on the mounting frame 8, and the motor 9 is fixedly connected to the end of the mounting frame 8. The end of the rack body 10 is connected to the output shaft of the motor 9. The motor 9 is fixed to the end of the mounting frame 8, and the rack body 10 is rotatably mounted on the mounting frame 8. The output shaft of the motor 9 is connected to the end of the rack body 10. After receiving a control signal, the motor 9 starts, and the output shaft rotates, driving the rack body 10 to rotate synchronously. The rack body 10 meshes with the internal gear ring 4, thereby driving the internal gear ring 4 to rotate, providing stable power for camera orientation adjustment and load attitude adjustment. The mounting frame 8 provides fixation and support for the motor 9 and the rack body 10, ensuring the stability of the transmission process and preventing the rack body 10 from shifting, which could lead to meshing failure. Mounting bracket 8 is made of aluminum alloy and has a U-shaped structure. It has bearing seats at both ends. The two ends of the rack 10 are rotatably mounted in the bearing seats through bearings to ensure smooth rotation of the rack 10. The motor 9 is a micro DC servo motor 9, which is fixedly connected to the end of the rack 10 through a coupling. The motor 9 is fixed on the outside of one end of the mounting bracket 8.

[0033] Furthermore, the main body 1 has mounting grooves 11 on both sides. When the drive rack assembly is vertically arranged, the drive rack assembly is vertically installed in the mounting groove 11. At this time, the internal gear ring 4 is horizontally arranged and meshes with the rack body 10. The internal gear ring 4 is located on the upper or lower side of the main body 1.

[0034] The drive rack assembly can be installed horizontally or vertically according to usage requirements. When installed vertically, the drive rack assembly is embedded into the pre-set mounting slots 11 on both sides of the main body 1 and fixed. At this time, the drive rack assembly is arranged vertically and meshes with the horizontally placed internal gear ring 4. The motor 9 drives the rack body 10 to rotate vertically, which drives the horizontal internal gear ring 4 to rotate around the vertical axis. The screw 6, mounting plate 7 on the internal gear ring 4 and the mounted camera and cargo compartment rotate synchronously, which can still realize multi-directional shooting and multi-item loading. Moreover, the horizontal arrangement of the internal gear ring 4 does not affect its anti-drop function.

[0035] Furthermore, the gear body 10 is provided with a slot 12, into which the screw 6 can be inserted. The gear body 10 has a pre-set slot 12 that matches the diameter of the screw 6. When the drone is working normally, the screw 6 is only connected to the screw hole 5 of the internal gear ring 4 and is not inserted into the slot 12. The internal gear ring 4 can rotate freely under the drive of the gear assembly, enabling adjustment of the shooting direction and the attitude of the load. When it is necessary to fix the internal gear ring 4 (such as for precise shooting, fixing the load position, wire clamping, etc.), the screw 6 is moved towards the gear body 10, so that the end of the screw 6 is inserted into the slot 12 of the gear body 10. The cooperation between the screw 6 and the slot 12 restricts the relative rotation between the gear body 10 and the internal gear ring 4, thereby fixing the position of the internal gear ring 4 and preventing it from rotating or moving on its own.

[0036] Furthermore, an annular airbag 13 is sleeved on the screw 6, and at least two through holes 14 are provided on the mounting plate 7. The annular airbag 13 is connected to at least two strip-shaped airbags 15, each located in one of the two through holes 14 and extending to the other side of the mounting plate 7. With this arrangement, when the screw 6 is installed, the annular airbag 13 expands due to pressure from the outer surface of the internal toothed ring 4 and the mounting plate 7, thereby inflating the strip-shaped airbags 15. This tightens the camera or cargo compartment on the mounting plate 7, increasing the stability of the installation. Furthermore, when the camera or cargo compartment is not mounted, the protruding strip-shaped airbags 15 act as cushioning elements. Moreover, when the camera or cargo compartment is not mounted, the two strip-shaped airbags 15, when inflated, can fit together, clamping and fixing the wire. The internal toothed ring 4 can be rotated to tension the wire, preventing it from swaying in the wind; further rotation is not recommended at this time. Furthermore, the two ends of the annular airbag 13 are squeezed by the outer surface of the internal toothed ring 4 and the mounting plate 7, which has friction and can prevent the mounting plate 7 and the screw 6 from rotating on their own.

[0037] Furthermore, it also includes detachable claw-type landing gear 16, installed below the arms 2; the arms 2 adopt a hollow truss structure. The detachable cover plate on the top of the fuselage body 1 is connected to the fuselage body 1 by buckles or bolts. After removing the cover plate, the control module, wiring and other components inside the fuselage can be directly accessed, which is convenient for inspection and maintenance; the claw-type landing gear 16 is detachably installed below the four arms 2 by bolts. The claw-shaped structure of the landing gear 16 can play a buffering role during the take-off and landing of the UAV, reducing the impact force on the ground; the hollow truss structure of the arms 2 reduces the weight of the arms 2 themselves while ensuring structural strength, reduces the load on the power components 3, and improves the flight endurance and stability of the UAV.

[0038] Furthermore, the main body 1 is equipped with an attitude sensor 17, which is electrically connected to the motor 9 of the drive rack assembly. The attitude sensor 17 is used to collect the pitch and roll angle attitude information of the UAV, and automatically controls the motor 9 to rotate according to the current flight attitude of the UAV, thereby driving the internal gear ring 4 to rotate, so that the camera on the mounting plate 7 always maintains a horizontal shooting attitude. The attitude sensor 17 collects the forward tilt, backward tilt, and left and right tilt angles of the UAV in real time and transmits the signals to the flight controller. The flight controller calculates the angle that needs to be compensated and outputs a signal to the motor 9 of the drive rack assembly. The motor 9 drives the internal gear ring 4 to rotate forward or backward, automatically adjusting the camera angle to counteract the tilt of the UAV and keep the image horizontal and stable.

[0039] No manual gimbal adjustment is needed; if the drone tilts, the internal gear ring 4 automatically rotates to keep the image level. This transforms the internal gear ring 4 into a smart electronic image stabilization ring, resulting in more stable and professional shooting. The structure is simple, not reliant on the camera's own gimbal, reducing costs. Specifically, the drone body houses a gyroscope and accelerometer attitude sensor 17, which connects to the flight control board. The flight control board outputs PWM signals to control the geared motor 9. When the target horizontal angle is set, and the drone tilts by 5°, motor 9 drives the internal gear ring 4 to rotate 5° in the opposite direction for compensation.

[0040] Furthermore, the main body 1 is equipped with a fall detection sensor 18, which is electrically connected to the motor 9 of the drive gear assembly. When the sensor detects that the drone has entered a weightless fall state, the motor 9 immediately drives the internal gear ring 4 to rotate to a protective posture, so that the internal gear ring 4, the screw 6 and the mounting plate 7 form a ring-shaped protective frame that wraps around the main body 1.

[0041] The fall sensor detects a crash based on sudden acceleration changes. Once a crash is detected, it immediately signals the drive gear motor 9. The motor 9 rapidly rotates the internal gear ring 4 to the optimal angle for impact protection, aligning the ring structure with the potential impact direction. This achieves active crash protection, rather than passively waiting for a collision. Regardless of whether the crash is head-on, upside down, or sideways, the internal gear ring 4 automatically rotates to the optimal impact-resistant position, significantly reducing the damage rate in the event of an inverted crash. A triaxial accelerometer detects a crash when it detects an acceleration close to 0g for 20 consecutive ms. Within 100ms, the drive motor 9 rotates the internal gear ring 4 to its outermost convex position on the fuselage, forming an impact-resistant ring.

[0042] Furthermore, the main body 1 is equipped with an airspeed sensor 19 or a flight speed detection module, which is electrically connected to the motor 9 of the drive gear assembly. When the drone accelerates, decelerates, or turns, the motor 9 drives the internal gear ring 4 to rotate, adjusting the center of gravity of the cargo compartment to keep the overall center of gravity of the drone at the center of the fuselage. The speed sensor / flight control outputs the current flight speed, acceleration / deceleration, and turning information; the system judges the trend of center of gravity shift; the motor 9 drives the internal gear ring 4 to rotate, moving the position of the cargo and dynamically balancing the center of gravity. When carrying cargo, high-speed flight is stable without shaking, drifting, or tipping. The internal gear ring 4 can act as an automatic balancing ring, becoming more stable with a larger load. This improves flight safety and the upper limit of the cargo capacity. In a simplified implementation, the flight control outputs speed and acceleration data; when the drone accelerates forward, the cargo compartment will move backward due to inertia, and the motor 9 drives the internal gear ring 4 to make a slight forward adjustment to counteract the backward shift of the center of gravity.

[0043] Furthermore, obstacle avoidance sensors 20 are provided around the main body 1. The obstacle avoidance sensors 20 are electrically connected to the motor 9 of the drive rack assembly. When the obstacle avoidance sensor 20 detects an obstacle in a certain direction, the motor 9 drives the internal gear ring 4 to rotate, causing the buffer or screw 6 assembly on the mounting plate 7 to turn towards the obstacle, forming a buffer blocking surface.

[0044] Front, rear, left, and right obstacle avoidance sensors 20 detect obstacles in real time. Once one side approaches an obstacle, motor 9 immediately drives the internal gear ring 4 to rotate, turning the buffer, screw 6, and mounting plate 7 towards the obstacle's direction, ensuring contact with the obstacle first and protecting the body and power unit 3. The internal gear ring 4 and buffer become 360°, forming an intelligent anti-collision buffer mechanism. This allows the device to assume a defensive posture before impact, rather than directly resisting. Furthermore, it can automatically switch between shooting, carrying, and anti-collision functions without manual intervention. For example, infrared or TOF obstacle avoidance sensors 20 are installed around the body; when the left side is less than 0.5m from an obstacle, motor 9 drives the internal gear ring 4 to rotate left, aligning the buffer with the left side.

[0045] Working principle of the invention: This configuration allows the drive rack assembly to rotate the internal gear ring 4, thereby adjusting the camera's direction—down, up, or left / right. It can also carry cargo bays individually or simultaneously. Because the screw holes 5 have multiple locations, several cargo bays can be mounted for better balance. This does not affect the drone's flight. In the event of a crash, regardless of whether the drone is upside down or downside down, the internal gear ring 4 will make contact with the ground first, thus preventing a fall.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A low-altitude unmanned aerial vehicle (UAV), characterized in that, include: The main body (1) has two threaded holes at its four corners; Four arms (2), one end of each arm (2) is a connecting end with two round holes, which are fastened to the threaded holes of the main body (1) by two screws; the other end of the arm (2) is the power installation end; Four power units (3) are respectively installed at the power mounting ends of the four arms (2); The load-bearing component includes a drive rack assembly disposed on the main body (1), the drive rack assembly being meshed with an internal gear ring (4), the internal gear ring (4) having a plurality of screw holes (5), a screw (6) being connected in the screw holes (5), and a mounting plate (7) being provided at the end of the screw (6) for mounting at least one of a camera, a cargo compartment, and a buffer.

2. A low-altitude unmanned aerial vehicle as described in claim 1, characterized in that: The drive rack assembly includes a mounting frame (8), a motor (9) and a rack body (10). The rack body (10) is rotatably mounted on the mounting frame (8), the motor (9) is fixedly connected to the end of the mounting frame (8), and the end of the rack body (10) is connected to the output shaft of the motor (9).

3. A low-altitude unmanned aerial vehicle as described in claim 1, characterized in that: The main body (1) has mounting grooves (11) on both sides. When the drive rack assembly is vertically arranged, the drive rack assembly is vertically installed in the mounting groove (11). At this time, the inner tooth ring (4) is horizontally arranged and meshes with the rack body (10). The inner tooth ring (4) is located on the upper or lower side of the main body (1).

4. A low-altitude unmanned aerial vehicle as described in claim 1, characterized in that: The toothed rod body (10) is provided with a slot (12), and the screw (6) can be inserted into the slot (12).

5. A low-altitude unmanned aerial vehicle as described in claim 1, characterized in that: The screw (6) is fitted with an annular airbag (13), and the mounting plate (7) has at least two through holes (14). The annular airbag (13) is connected to at least two strip-shaped airbags (15). The strip-shaped airbags (15) are located in the two through holes (14) and extend to the other side of the mounting plate (7).

6. A low-altitude unmanned aerial vehicle as described in claim 1, characterized in that: It also includes a detachable claw landing gear (16) installed below the arm (2); the arm (2) adopts a hollow truss structure.

7. A low-altitude unmanned aerial vehicle as described in claim 1, characterized in that: The main body (1) is equipped with an attitude sensor (17), which is electrically connected to the motor (9) of the drive rack assembly. The attitude sensor (17) is used to collect pitch angle and roll angle attitude information of the UAV, and automatically control the motor (9) to rotate according to the current flight attitude of the UAV, thereby driving the internal gear ring (4) to rotate, so that the camera on the mounting plate (7) always maintains a horizontal shooting attitude.

8. A low-altitude unmanned aerial vehicle as described in claim 1, characterized in that: The fuselage body (1) is equipped with a fall detection sensor (18), which is electrically connected to the motor (9) of the drive rack assembly. When the sensor detects that the drone has entered a weightless fall state, the motor (9) immediately drives the internal gear ring (4) to rotate to the protective posture, so that the internal gear ring (4), the screw (6) and the mounting plate (7) form a ring protective frame that wraps around the fuselage body (1).

9. A low-altitude unmanned aerial vehicle as described in claim 1, characterized in that: The fuselage body (1) is equipped with an airspeed sensor (19) or a flight speed detection module, which is electrically connected to the motor (9) of the drive rack assembly. When the UAV accelerates, decelerates or turns, the motor (9) drives the internal gear ring (4) to rotate, adjusting the center of gravity of the cargo compartment so that the overall center of gravity of the UAV is always kept in the center of the fuselage.

10. A low-altitude unmanned aerial vehicle as described in claim 1, characterized in that: The main body (1) is equipped with obstacle avoidance sensors (20) around its perimeter. The obstacle avoidance sensors (20) are electrically connected to the motor (9) of the drive rack assembly. When the obstacle avoidance sensor (20) detects an obstacle in a certain direction, the motor (9) drives the internal gear ring (4) to rotate, causing the buffer or screw (6) assembly on the mounting plate (7) to turn towards the obstacle, forming a buffer blocking surface.

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