A hoisting structure for large load-carrying unmanned aerial vehicles

Abstract

The utility model relates to unmanned plane technical field, and disclose a hoisting structure for large -scale load -carrying unmanned plane, including a hoisting structure for large -scale load -carrying unmanned plane, including support frame, support frame circumference array connects arc support, arc support end connects fixed disc, and fixed disc is used for connecting unmanned plane bottom, support frame below connects universal joint, and the outer ring of universal joint below is provided with centrifugal gravity damping, and the shaft core fan is connected below centrifugal gravity damping, and the connecting chain is equipped below shaft core fan, and the connecting chain below connects the load plate. The utility model through universal joint realizes the flexible connection of support frame and below mechanism, and the direct impact of unmanned plane attitude change to goods is isolated, and the load -carrying system is allowed to adapt deflection, and the rigid interference risk is greatly reduced, reaches the effect of improving unmanned plane attitude adaptability.

Description

Technical Field

[0001] This utility model relates to the field of unmanned aerial vehicle (UAV) technology, specifically a hoisting structure for large-scale heavy-duty UAVs. Background Technology

[0002] The lifting structure for large-payload unmanned aerial vehicles (UAVs) is a mechanical and control system integration specifically designed for the safe and stable suspension, lifting, transporting, and release of heavy payloads. It is one of the core subsystems of this type of UAV, directly impacting the efficiency and safety of mission execution.

[0003] In existing technologies, traditional hoisting systems mostly use rigid connections or simple hinges. Changes in the attitude of drones directly cause violent shaking of the cargo, which can easily lead to structural damage or loss of control. They rely on passive vibration reduction such as springs or rubber pads, which can only absorb low-frequency vibrations and are insufficient in suppressing high-frequency oscillations and multi-directional composite vibrations. Their energy dissipation efficiency is low. Ordinary anti-slip textures or rubber pads are prone to failure under high-speed maneuvers or airflow impacts, resulting in a high risk of cargo slippage. Furthermore, the lack of multi-level damping design means that vibration energy can be amplified at specific frequencies, causing resonance in the hoisting system. Utility Model Content

[0004] The purpose of this utility model is to provide a hoisting structure for large-scale heavy-duty unmanned aerial vehicles (UAVs) that solves the problems of poor attitude adaptability and a single shock absorption mechanism.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model relates to a hoisting structure for a large-scale heavy-duty drone. The structure includes a support frame, an arc-shaped bracket connected in a circular array around the support frame, a fixed plate connected to the end of the arc-shaped bracket, the fixed plate being used to connect to the bottom of the drone, a universal joint connected below the support frame, a centrifugal gravity damper fitted around the outer ring below the universal joint, a shaft fan connected below the centrifugal gravity damper, a connecting chain below the shaft fan, and a cargo plate connected below the connecting chain.

[0007] Furthermore, the universal joint includes a cross shaft, and each of the four ends of the cross shaft is provided with a connecting shaft for connecting external components.

[0008] Furthermore, the centrifugal gravity damping includes a damping box, inside which is a solid gravity ball that can roll freely within the damping box as the center of gravity changes.

[0009] Furthermore, a connecting groove is provided above the axial fan to connect to centrifugal gravity damping, and fan blades are arranged in a circular array around the axial fan. The fan blades are configured to guide the surrounding airflow to provide air damping when rotating.

[0010] Furthermore, the connecting chain includes a connecting chain, with the upper part of the chain fixed to the central fan, and a fixed shaft provided below the chain. The fixed shaft is connected to the cargo plate, and the connecting chain is covered with a paraffin-copper powder phase change composite material layer.

[0011] Furthermore, a connecting plate is provided above the cargo plate, a fixed shaft for connecting chains is connected above the connecting plate, and an anti-slip layer is provided on the bottom surface of the cargo plate.

[0012] This utility model has the following beneficial effects:

[0013] (1) This utility model achieves a flexible connection between the support frame and the lower mechanism through a universal joint, which isolates the direct impact of the UAV attitude change on the cargo, allows the cargo system to adaptively deflect, greatly reduces the risk of rigid interference, and achieves the effect of improving the attitude adaptability of the UAV.

[0014] (2) This utility model uses centrifugal gravity damping to adaptively consume horizontal and vertical vibration energy through multi-directional rolling friction of gravity balls in the damping box, and the fan blades of the axial fan convert the oscillating kinetic energy into air vortex dissipation. The connecting chain is covered with a paraffin-copper powder phase change layer, and the phase change latent heat energy is consumed through multi-level coordinated damping energy consumption, thus achieving multiple vibration reduction effects.

[0015] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the support frame structure of this utility model;

[0019] Figure 3 This is a schematic diagram of the universal joint structure of this utility model;

[0020] Figure 4 This is a schematic diagram of the centrifugal gravity damping half-section structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the half-section structure of the axial fan of this utility model;

[0022] Figure 6 This is a schematic diagram of the half-section structure of the connecting chain of this utility model;

[0023] Figure 7 This is a schematic diagram of the cargo platform structure of this utility model;

[0024] The attached diagram lists the components represented by each number as follows:

[0025] In the diagram: 1. Support frame; 11. Arc-shaped bracket; 12. Fixed plate; 2. Universal joint; 21. Cross shaft; 22. Connecting shaft; 3. Centrifugal gravity damper; 31. Gravity ball; 32. Damping box; 4. Shaft fan; 41. Connecting groove; 42. Fan blade; 5. Connecting chain; 51. Locking chain; 52. Fixed shaft; 6. Cargo plate; 61. Connecting plate; 62. Anti-slip layer. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figures 1-7 As shown, this utility model is a hoisting structure for a large-scale heavy-duty drone, including a support frame 1, an arc-shaped bracket 11 connected in a circular array to the support frame 1, a fixed plate 12 connected to the end of the arc-shaped bracket 11, the fixed plate 12 being used to connect to the bottom of the drone, a universal joint 2 connected below the support frame 1, a centrifugal gravity damper 3 sleeved on the outer ring below the universal joint 2, a shaft fan 4 connected below the centrifugal gravity damper 3, a connecting chain 5 provided below the shaft fan 4, and a cargo plate 6 connected below the connecting chain 5.

[0028] Universal joint 2 includes a cross shaft 21, and each of the four ends of the cross shaft 21 is provided with a connecting shaft 22 for connecting external components.

[0029] When the UAV changes its flight attitude or is subjected to external forces, the relative angle between the support frame 1 above the universal joint 2 and the centrifugal gravity damper 3 below will change. At this time, the cross shaft 21 of the universal joint 2 allows the support frame 1 and the damping box 32 connected to it to rotate flexibly at small angles around the center point of the cross shaft 21 in multiple directions through the connecting shafts 22 at its four ends. This structure effectively transmits the vertical load and decouples the non-axial movement of the support frame 1 and the damping mechanism below in the horizontal plane. It significantly reduces the rigid impact and violent shaking caused by the UAV attitude adjustment or airflow disturbance directly transmitted to the cargo, improves the adaptability of the entire hoisting system to changes in flight attitude, and creates conditions for the effective operation of the subsequent centrifugal gravity damper 3 and the shaft fan 4, thereby ensuring the stability and structural reliability of heavy load transportation.

[0030] The centrifugal gravity damper 3 includes a damping box 32, inside which is a solid gravity ball 31, which can roll freely within the damping box 32 as the center of gravity changes.

[0031] When the drone and the hoisting structure change attitude or sway due to airflow disturbance, the solid gravity ball 31 in the centrifugal gravity damper 3 will move relative to the damping box 32 due to inertia. During horizontal swaying or rotation, the gravity ball 31 will roll towards the outer box wall under the action of centrifugal force. The rolling of the gravity ball 31 on the inner wall of the damping box 32 will generate continuous friction, effectively converting mechanical kinetic energy into heat energy and dissipating it. This passive damping mechanism based on gravity and centrifugal force can adaptively respond to the multi-directional and multi-angle vibration and sway of the drone during flight. It can provide significant vibration reduction and energy absorption without external energy, greatly suppressing the sway amplitude and the impact force transmitted to the cargo plate 6 below, thereby effectively improving the stability and safety of cargo transportation.

[0032] A connecting groove 41 is provided above the axial fan 4 to connect the centrifugal gravity damper 3. The axial fan 4 is surrounded by a circumferential array of fan blades 42, which are configured to guide the surrounding airflow to provide air damping when rotating.

[0033] When the centrifugal gravity damper 3 is driven by the swing of the UAV, the axial fan 4 below it receives the rotational motion synchronously through the connecting groove 41. At this time, the circumferential array of fan blades 42 of the axial fan 4 cuts into the surrounding air as it rotates, forcibly guiding the airflow to form a vortex and generating resistance in the opposite direction of rotation. This resistance converts the rotational kinetic energy into air friction heat energy dissipation. The air damping provided by the fan blades 42 and the friction damping of the gravity ball 31 above form a secondary energy dissipation mechanism, which significantly enhances the ability to suppress high-frequency vibration. At the same time, the airflow disturbance can accelerate heat dissipation and avoid local overheating. This passive design can efficiently absorb the swing energy without additional energy, greatly reducing the residual vibration amplitude transmitted to the connecting chain 5, effectively improving the cargo carrying stability and reducing the risk of structural resonance.

[0034] The connecting chain 5 includes a connecting chain 51, which is fixed on the shaft fan 4 at the top and a fixed shaft 52 is provided at the bottom of the chain 51. The fixed shaft 52 is connected to the cargo plate 6. The connecting chain 51 is covered with a paraffin-copper powder phase change composite material layer.

[0035] When the oscillation energy of the axial fan 4 is transferred to the connecting chain 5, the connecting chain 51 consumes part of the kinetic energy through the relative displacement and bending deformation between the chain links. At the same time, under the action of vibration, the paraffin-copper powder phase change composite material layer is coated with paraffin components that absorb heat and undergo solid-liquid phase change, while the copper powder accelerates the heat diffusion. This process continuously converts mechanical vibration energy into latent heat of phase change and dissipates it into the environment. The composite material layer achieves efficient passive energy absorption through high latent heat value, which significantly weakens the high-frequency residual vibration transmitted from the chain 51 to the cargo plate 6. The copper powder enhances thermal conductivity, which enables the material to quickly return to solid state and maintain long-term damping performance. Ultimately, it greatly reduces the swaying amplitude of the cargo, improves the stability of transportation, and protects the UAV hoisting structure from fatigue damage.

[0036] A connecting plate 61 is provided above the cargo plate 6, and a fixed shaft 52 of the connecting chain 5 is connected above the connecting plate 61. An anti-slip layer 62 is provided on the bottom surface of the cargo plate 6. The anti-slip layer 62 is made of a sharkskin-like microstructure textured material.

[0037] When the vibration of the connecting chain 5 is transmitted to the cargo plate 6, the connecting disc 61 forms a flexible docking through the fixed shaft 52, allowing the cargo plate 6 to slightly adaptively deflect in three dimensions to release stress. At the same time, the anti-slip layer 62 placed under the cargo significantly increases the friction coefficient and adsorption force with the bottom surface of the cargo through the micro-vortex effect generated by the sharkskin-like microstructure texture. The flexible connection structure effectively buffers residual impact and avoids damage to the cargo due to rigid connection. The directional groove texture of the anti-slip layer 62 can suppress horizontal slippage and rotation of the cargo, ensuring that there is no risk of cargo displacement under heavy load conditions. The two work together to ensure loading stability under extreme flight attitudes, greatly reduce cargo damage rate and improve transportation reliability.

[0038] Specifically, when the UAV changes its flight attitude or encounters airflow disturbances, the universal joint 2 below the support frame 1 allows the hoisting structure to deflect freely within a certain angle. At this time, the solid gravity ball 31 inside the centrifugal gravity damper 3 rolls in the damping box 32 under the action of inertial centrifugal force and gravity, generating frictional damping. At the same time, the axial fan 4 connected below the damper rotates accordingly, and its circumferential array of fan blades 42 guides the surrounding airflow to form air damping. The two levels of damping work together to effectively absorb and dissipate the swing energy. Subsequently, the motion is transmitted through the connecting chain 5, and its outer paraffin copper powder phase change composite material layer further absorbs energy through phase change. Finally, the motion is transmitted to the cargo plate 6, and the sharkskin-like microstructure textured anti-slip layer 62 at the bottom ensures the stability of the cargo. This multi-level collaborative vibration reduction design significantly suppresses the swaying of the cargo during flight, greatly improves the stability, safety and flight efficiency of the hoisting, and effectively protects the cargo and the UAV structure.

[0039] During use, when the drone's flight attitude changes or is subjected to external forces, a relative angle change occurs between the support frame 1 above the universal joint 2 and the centrifugal gravity damper 3 below. At this time, the cross shaft 21 of the universal joint 2, through the connecting shafts 22 at its four ends, allows the support frame 1 and the damping box 32 connected to it to rotate flexibly at small angles around the center point of the cross shaft 21 in multiple directions. Due to inertia, the solid gravity ball 31 inside the centrifugal gravity damper 3 generates relative motion within the damping box 32. During horizontal swinging or rotation, the gravity ball 31 rolls towards the outer box wall under the action of centrifugal force. The rolling of the gravity ball 31 on the inner wall of the damping box 32 generates continuous friction, effectively converting mechanical kinetic energy into heat energy and dissipating it. The centrifugal gravity damper 3, due to the drone's... When driven by oscillation, the central fan 4 below it receives the rotational motion synchronously through the connecting groove 41. At this time, the circumferential array of fan blades 42 of the central fan 4 cuts into the surrounding air as it rotates, forcibly guiding the airflow to form a vortex and generating resistance in the opposite direction of rotation. This resistance converts the rotational kinetic energy into air friction heat energy dissipation. The air damping provided by the fan blades 42 and the friction damping of the gravity ball 31 above form a secondary energy dissipation mechanism. When the vibration of the connecting chain 5 is transmitted to the cargo plate 6, the connecting disc 61 forms a flexible docking through the fixed shaft 52, allowing the cargo plate 6 to slightly adaptively deflect in three dimensions to release stress. At the same time, the anti-slip layer 62 placed under the cargo significantly increases the friction coefficient and adsorption force with the bottom surface of the cargo through the micro-vortex effect generated by the micro-structure texture of the shark skin.

[0040] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A hoisting structure for a large-scale heavy-duty unmanned aerial vehicle (UAV), comprising a support frame (1), wherein the support frame (1) is circumferentially arrayed with arc-shaped brackets (11), and the end of the arc-shaped brackets (11) is connected to a fixing plate (12), the fixing plate (12) being used to connect to the bottom of the UAV, characterized in that: The support frame (1) is connected to a universal joint (2) below. A centrifugal gravity damper (3) is fitted on the outer ring below the universal joint (2). A spindle fan (4) is connected below the centrifugal gravity damper (3). A connecting chain (5) is provided below the spindle fan (4). A cargo plate (6) is connected below the connecting chain (5).

2. The hoisting structure for a large-scale heavy-duty unmanned aerial vehicle according to claim 1, characterized in that: The universal joint (2) includes a cross shaft (21), and each of the four ends of the cross shaft (21) is provided with a connecting shaft (22) for connecting external components.

3. The hoisting structure for a large-scale heavy-duty unmanned aerial vehicle according to claim 1, characterized in that: The centrifugal gravity damping (3) includes a damping box (32), inside which is a solid gravity ball (31), which can roll freely within the damping box (32) as the center of gravity changes.

4. The hoisting structure for a large-scale heavy-duty unmanned aerial vehicle according to claim 1, characterized in that: The axial fan (4) is provided with a connecting groove (41) above it to connect to the centrifugal gravity damper (3). The axial fan (4) is surrounded by a circumferential array of fan blades (42), which are configured to guide the surrounding airflow to provide air damping when rotating.

5. The hoisting structure for a large-scale heavy-duty unmanned aerial vehicle according to claim 1, characterized in that: The connecting chain (5) includes a connecting chain (51), which is fixed on the shaft fan (4) above and a fixed shaft (52) is provided below the chain (51). The fixed shaft (52) is connected to the cargo plate (6). The connecting chain (51) is covered with a paraffin-copper powder phase change composite material layer.

6. The hoisting structure for a large-scale heavy-duty unmanned aerial vehicle according to claim 1, characterized in that: A connecting plate (61) is provided above the cargo plate (6), and a fixed shaft (52) of the connecting chain (5) is connected above the connecting plate (61). An anti-slip layer (62) is provided on the bottom surface of the cargo plate (6).

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