Cargo unmanned aerial vehicle anti-impact lifting platform

Abstract

The utility model provides a kind of freight unmanned plane anti-impact lifting platform, it include oblique support structure;Two oblique support structures are symmetrically installed between base and platform;Each oblique support structure includes two oblique support rods, the two oblique support rods form X and are rotatably connected with each other;The lower end of the two oblique support rods is fixedly connected and slidably connected with base respectively, and the upper end is fixedly connected with platform;Two oblique support structures are installed with transverse support beam between, the transverse shock absorber is arranged between the two transverse support beams, and the vertical shock absorber is arranged between platform and transverse support beam.The utility model includes shock absorber, transverse support beam and oblique support structure, by internal cooperation, for directly bearing unmanned aerial vehicle load and dispersing impact stress, effectively enhance the anti-impact capability, simultaneously by installing hydraulic pull rod, the height of anti-impact lifting platform can be adjusted appropriately, so that unmanned aerial vehicle can be more smoothly landed.

Description

Technical Field

[0001] This utility model belongs to the field of unmanned aerial vehicle (UAV) logistics infrastructure, specifically relating to an impact-resistant lifting platform for cargo UAVs. Background Technology

[0002] As the payload capacity of logistics drones exceeds 500kg (e.g., the SF Express MF-3000 drone has a maximum payload of 1.2 tons), the technical deficiencies of traditional take-off and landing platforms in terms of impact resistance are becoming increasingly apparent. Existing technologies mainly suffer from the following structural contradictions:

[0003] The mainstream solution CN114215101A employs a helical spring buffer structure. Its linear stiffness characteristics result in a rigid system during emergency landings by drones (impact velocities > 3 m / s). Actual measurement data shows that the spring structure undergoes permanent buckling deformation when the impact energy exceeds 15 kJ. While the hydraulic buffer solution proposed in CN113548432B can withstand greater loads, its complex piping system suffers from hydraulic oil solidification failure at -20°C.

[0004] Drone drop impacts exhibit significant unsteady-state characteristics, with their impact load spectrum displaying a bimodal pattern in the time domain (initial contact peak + secondary peak of structural rebound). Existing platforms, such as the DJI Matrice 600's landing pad, have natural frequencies concentrated in the 8–12 Hz range, resulting in coupled vibrations with the drone rotor's operating frequency band (14–18 Hz). Test data from Shenzhen Airport in 2022 showed that when this platform withstood a 300 kg drop, the resonance amplification factor reached 2.3 times (peak acceleration surged from 22 g to 51 g).

[0005] The following are common problems with take-off and landing platforms used in coastal areas: Salt spray corrosion leads to a decrease in structural strength (the strength of bolted connections on one model decreased by 37% after 6 months of use); anti-slip performance changes drastically with temperature (the anti-slip coefficient μ drops from 0.8 to 0.3 at -10℃); and there is a lack of lightning protection design (three platform fires occurred due to lightning strikes during the 2021 typhoon season in Hainan).

[0006] Current industry standards still use static load testing methods, which cannot capture millisecond-level impact events. Maintenance records from a logistics company show that, after traditional platforms are subjected to multiple small impacts (<10kN) that do not reach the design threshold, the cumulative damage leading to sudden structural failure is as high as 62%.

[0007] Spring-damped systems, such as the "A UAV Buffer Take-off and Landing Platform" disclosed in Chinese Patent CN114215101A (publication date 2022-05-17), employ a combination structure of helical springs and hydraulic rods. Its technical drawback lies in the linear stiffness characteristics, which cause the energy absorption efficiency to decrease sharply with increasing impact velocity. Actual measurement data shows that when the impact velocity exceeds 3 m / s, the system's energy absorption rate drops from 58% to 31%.

[0008] Pneumatic-Hydraulic Buffer Device: The "Pneumatic-Hydraulic Landing System" disclosed in US Patent US20230145678A1 (publication date 2023-05-11) works in conjunction with a pneumatic accumulator and a hydraulic damper. Although its maximum load is increased to 800kg, there is a sudden change in oil viscosity in low-temperature environments (<-20℃), resulting in a response delay of up to 120ms.

[0009] Composite material energy-absorbing structures: The paper "Bio-inspired cellular structures for impact energy absorption" published in the journal *Composite Structures* (Vol. 285, 2022, pp. 115-203) proposes a biomimetic honeycomb composite material scheme. Although its specific energy absorption value reaches 18 kJ / kg, its Young's modulus is only 2.1 GPa, which cannot meet the rigidity requirements of the take-off and landing platform.

[0010] Insufficient dynamic adaptability: Traditional linear systems (such as CN114215101A) are difficult to match the unsteady characteristics of UAV impact loads, whose natural frequencies are concentrated in the range of 8 to 12 Hz, causing harmful resonance with the rotor vibration main frequency (14 to 18 Hz).

[0011] Environmental adaptability defects: Under extreme temperatures (such as the -30°C condition disclosed in US20230145678A1), abrupt changes in material properties increase the risk of system instability.

[0012] Multi-objective optimization imbalance: There are sharp contradictions between key parameters such as stiffness, energy absorption, and weight in the existing scheme. Utility Model Content

[0013] In order to overcome the above problems, the purpose of this utility model is to provide an impact-resistant lifting platform for cargo drones, which is suitable for the take-off and landing operations of medium and heavy logistics drones in complex terrain conditions such as mountains and islands.

[0014] An impact-resistant lifting platform for cargo drones includes oblique support structures; two oblique support structures are symmetrically installed between a base and a platform; each oblique support structure includes two oblique support rods, which form an X shape and are rotatably connected to each other; the lower ends of the two oblique support rods are fixedly connected to the base and slidably connected to it, respectively, and the upper ends are fixedly connected to the platform; a transverse support beam is installed between the two oblique support structures, a transverse shock absorber is provided between the two transverse support beams, and a vertical shock absorber is provided between the platform and the transverse support beams.

[0015] Furthermore, slide rails are provided on the left and right sides of the base. A fixed steel plate is provided on one side of the slide rail, and a slidable steel plate is provided on the other side. A pulley is installed under the slidable steel plate to match the slide rail.

[0016] Furthermore, the transverse support beam is symmetrically installed between the upper halves of the two diagonal support structures.

[0017] Furthermore, a connecting rod is installed between the fixed steel plate and the sliding steel plate above the slide rail, and a hydraulic tie rod is installed between the two connecting rods.

[0018] Furthermore, the shock absorber includes connecting members; the two connecting members on both sides are fixed inside the flange, and damping shock absorption is provided between the connecting members.

[0019] Furthermore, fixed steel plates are installed at the four corners of the platform, and the two diagonal support rods are connected to the platform through the fixed steel plates.

[0020] Furthermore, the vertical shock absorbers are arranged in two sets on each side, symmetrically installed on both sides of the horizontal shock absorber.

[0021] Furthermore, the connector is a forged earring joint, fitted with a self-lubricating bearing.

[0022] Furthermore, the platform is made of high-strength steel plate, and the surface of the steel plate is laser-engraved with diamond-shaped anti-slip patterns.

[0023] The beneficial effects of this utility model are as follows:

[0024] 1. This utility model platform is made of Q355B high-strength steel plate with laser-engraved diamond-shaped anti-slip texture on the surface, achieving a friction coefficient of 0.8 (dry condition). It is used to directly bear the payload of the UAV and disperse impact stress. The connection nodes are fixed with flanges and 10.9 grade M24 high-strength bolts. The shock absorbers are commercial vehicle damping shock absorbers (such as KYB 335256 type). The upper end of the vertical shock absorber is connected to the bottom surface of the steel plate, and the lower end is fixed to the horizontal support beam. Horizontal shock absorbers are set between the two horizontal support beams, effectively enhancing the overall impact resistance. The connecting parts are forged lug joints, equipped with self-lubricating bearings.

[0025] 2. During UAV landing, the lateral support beam and diagonal support structure distribute the load to four sets of shock absorbers. During the compression phase, the piston rod is compressed, and hydraulic oil generates damping force through the throttle orifice, dissipating 60%–70% of the impact energy. During the rebound phase, the nitrogen accumulator pushes the piston back to its original position, with a rebound damping ratio set at 2:1 (compression damping: rebound damping) to prevent rebound vibration of the cargo UAV's impact-resistant landing platform. The diagonal support structure provides rigid support, limiting lateral displacement, and the shock absorbers can simultaneously absorb both vertical and horizontal impact components (horizontal component attenuation rate ≥40%).

[0026] 3. This utility model adopts a coupled design of oblique support structure and vibration damper. Finite element analysis is used to optimize the included angle (45°±5°) of the two oblique support rods, ensuring that the structure's natural frequency avoids the vibration frequency band of the UAV rotor. The equipment adopts a modular quick-assembly structure; flange connection nodes allow for platform assembly within 15 minutes. Bolt holes are pre-reserved with ±1mm tolerance compensation positions. The vibration damper uses standardized interfaces, and the replacement time for a single unit is less than 10 minutes. Furthermore, the equipment uses all industrial-grade vehicle components, reducing procurement costs by 80% compared to dedicated aerospace components. Through cross-grid topology optimization, the structural weight is reduced by 30% under the same load-bearing capacity. Attached Figure Description

[0027] Figure 1 This is a front view of the overall structure of this utility model;

[0028] Figure 2 This is a side view of the overall structure of this utility model;

[0029] Figure 3 This is a diagram showing the internal structure of the shock absorber of this utility model.

[0030] Figure 4 This is a schematic diagram illustrating the specific installation process of the platform of this utility model.

[0031] Reference numerals: 1—base, 2—hydraulic tie rod, 3—diagonal support rod, 4—shock absorber, 5—platform, 6—flange, 7—transverse support beam, 8—damping shock absorber, 9—connector. Detailed Implementation

[0032] The present invention will now be further described with reference to the accompanying drawings.

[0033] This utility model provides an impact-resistant lifting platform for cargo drones, which adopts a modular quick-assembly structure, enabling rapid assembly and maintenance. Through optimized structural design and component selection, it achieves multi-stage buffering and protection against impacts from different loads, and possesses rapid replacement and repair capabilities, combining high efficiency and reliability. The impact-resistant lifting platform for cargo drones includes an inclined support structure; two inclined support structures are symmetrically installed between a base 1 and a platform 5; each inclined support structure includes two inclined support rods 3, which form an X-shape and are rotatably connected to each other; the lower ends of the two inclined support rods 3 are fixedly connected to the base 1 and slidably connected to it, respectively, while their upper ends are both fixedly connected to the platform 5.

[0034] The transverse vibration dampers 4 are connected between the two transverse support beams 7 to reduce horizontal vibration of the platform. The vertical vibration dampers 4 are connected to the platform 5 on one side and to the transverse support beam 7 on the other side to reduce vertical vibration, ultimately forming a stable and vibration-damping platform system to support equipment or goods. The transverse support beams 7 are located between the two diagonal support structures, providing auxiliary support and enhancing the overall rigidity of the platform. Flanges 6 are installed on the transverse support beams 7 and can be used to connect the vibration dampers 4, facilitating assembly and fixing between components. This allows the impact-resistant lifting platform to better support equipment or goods and meet different working requirements.

[0035] During the drone's preparation for and landing, the diagonal support structures on both sides work in conjunction with the hydraulic rods 2. As the drone approaches the impact-resistant lifting platform, the diagonal support structures on both sides, under the action of the hydraulic rods 2, can appropriately adjust the height of the platform 5, allowing the drone to land more smoothly. During landing, the diagonal support structures on both sides bear part of the drone's weight and impact force from the platform 5 and transfer it to the base 1. Through the cross-arranged structural form, forces from all directions are effectively dispersed and resisted, ensuring that the impact-resistant lifting platform will not deform or be damaged when subjected to large loads. At the same time, the transverse support beams 7 can effectively prevent excessive deformation of the diagonal support structures on both sides, enhancing the rigidity of the entire structure.

[0036] Flange 6 facilitates the connection of the vibration damper 4. When the drone lands, it generates a significant vertical impact force on the platform 5. The main function of the vertical vibration damper 4 is to buffer this impact force, providing a stable landing environment for the drone. Upon contact with the platform 5, the vertical vibration damper 4 absorbs and buffers the impact force through its elastic deformation or damping action, effectively controlling the vertical displacement and vibration of the impact-resistant lifting platform. This not only protects the drone's landing gear and other components from excessive impact damage but also extends the service life of the cargo drone impact-resistant lifting platform itself, ensuring that it maintains good working condition throughout multiple drone landings.

[0037] During drone landing, lateral swaying or impact forces may occur due to factors such as flight attitude adjustments and wind. The lateral shock absorber 4 absorbs this lateral vibration energy and dissipates it through its internal damping structure, reducing the horizontal displacement and vibration amplitude of the impact-resistant landing platform. This helps ensure the drone lands accurately at the designated location, avoiding collisions caused by lateral swaying and deviation from the landing point, thus improving the safety and accuracy of drone landing. During landing, the platform 5 bears the weight of the drone and, in conjunction with the vertical shock absorber, transmits and buffers the impact force.

[0038] During installation, the first step is to install the base 1. Slide rails are installed on both sides of the base 1, and a fixed steel plate is installed on the left side of the base 1, providing basic support for the entire platform. The second step is to install the diagonal support rods 3. Each diagonal support structure includes two diagonal support rods 3, which form an X shape and are rotatably connected to each other. One side of each diagonal support rod 3 is connected to a fixed steel plate, and the other side is connected to a sliding steel plate. A pulley is installed below the sliding steel plate to match the slide rails. A connecting rod is installed between the fixed steel plate and the sliding steel plate above the slide rails, and a hydraulic tie rod 2 is installed between the connecting rods on both sides, constructing the initial frame structure of the platform. The third step is to install the flange 6 and the transverse support beam 7. The diagonal support structures on both sides... The first step involves installing transverse support beams 7 between the components. Flanges 6 are located on the transverse support beams 7 and are used to connect the transverse and vertical shock absorbers 4, further enhancing the stability and connectivity of the structure. The second step involves installing the transverse shock absorbers 4. The transverse shock absorbers 4 are located between the transverse support beams 7 on both sides to reduce the horizontal vibration of the platform and provide lateral vibration damping for the platform. The third step involves installing the vertical shock absorbers 4. The vertical shock absorbers 4 are located below the platform and between the transverse support beams 7 to mitigate vertical impact forces and improve the platform's vibration damping system. The fourth step involves installing the platform 5. A fixed steel plate is installed under the platform 5, which is connected to the two diagonal support rods 3 on both sides through the fixed steel plate, completing the construction of the entire platform.

[0039] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An impact-resistant lifting platform for cargo drones, characterized in that: It includes an inclined support structure; the two inclined support structures are symmetrically installed between the base (1) and the platform (5); each inclined support structure includes two inclined support rods (3), the two inclined support rods (3) form an X shape and are rotatably connected to each other; the lower ends of the two inclined support rods (3) are fixedly connected to the base (1) and slidably connected respectively, and the upper ends are fixedly connected to the platform (5); a transverse support beam (7) is installed between the two inclined support structures, a transverse shock absorber (4) is provided between the two transverse support beams (7), and a vertical shock absorber (4) is provided between the platform (5) and the transverse support beam (7).

2. The impact-resistant lifting platform for cargo drones according to claim 1, characterized in that: The base (1) is provided with slide rails on the left and right sides. A fixed steel plate is provided on one side of the slide rail, and a slidable steel plate is provided on the other side. A pulley is installed under the slidable steel plate to match the slide rail.

3. The impact-resistant lifting platform for cargo drones according to claim 1, characterized in that: The transverse support beam (7) is symmetrically installed between the upper parts of the two inclined support structures.

4. The impact-resistant lifting platform for cargo drones according to claim 2, characterized in that: A connecting rod is installed between the fixed steel plate and the sliding steel plate above the slide rail, and a hydraulic tie rod (2) is installed between the two connecting rods.

5. The impact-resistant lifting platform for cargo drones according to claim 1, characterized in that: The shock absorber (4) includes a connector (9); the two connectors (9) are fixed inside the flange (6), and a damping shock absorber (8) is provided between the connectors (9).

6. The impact-resistant lifting platform for cargo drones according to claim 1, characterized in that: The platform (5) is equipped with fixed steel plates at its four corners, and the two diagonal support rods (3) are connected to the platform (5) through the fixed steel plates.

7. The impact-resistant lifting platform for cargo drones according to claim 1, characterized in that: The vertical shock absorbers (4) are in two sets on each side, symmetrically installed on both sides of the horizontal shock absorbers (4).

8. The impact-resistant lifting platform for cargo drones according to claim 5, characterized in that: The connector (9) is a forged earring connector, which is used in conjunction with a self-lubricating bearing.

9. The impact-resistant lifting platform for cargo drones according to claim 1, characterized in that: The platform (5) is a high-strength steel plate with a diamond-shaped anti-slip pattern laser-engraved on its surface.

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