A lifting low-altitude vertical take-off and landing field

Abstract

This utility model discloses a lift-type low-altitude vertical take-off and landing field, belonging to the technical field of aviation ground support equipment. The platform includes a foundation, a movable platform, four worm gear lifts, and a synchronous drive system. The drive system consists of a single rotating motor that sequentially drives the four lifts via a first planetary gear reducer, two first transmission rods, two second planetary gear reducers, and four second transmission rods, thereby driving the lifting screws to make the movable platform move vertically. A guide sleeve is provided within the foundation to constrain the screws, and a supporting beam is provided under the platform to enhance rigidity. The platform integrates a distance sensor to monitor altitude in real time and is equipped with upper and lower limit position switches that cooperate with contact rods on the movable platform to achieve dual safety limits. This utility model solves the problems of high-precision synchronization, smooth lifting, and safety protection of multiple lifting points by combining mechanical synchronous transmission with intelligent measurement and control.

Description

Technical Field

[0001] This utility model relates to the field of aviation infrastructure technology, specifically to a lift-type low-altitude vertical take-off and landing field. Background Technology

[0002] With the rapid development of vertical takeoff and landing (VTOL) aircraft (such as electric vertical takeoff and landing (eVTOL) aircraft, drones, and helicopters), the supporting equipment for their takeoff, landing, and docking sites is receiving increasing attention. Currently, most common takeoff and landing platforms are fixed concrete platforms or simple steel structure platforms. These platforms are simple in structure and low in cost, but they cannot be height-adjusted according to the takeoff and landing requirements of the aircraft, nor can they adapt to the different landing gear height requirements of different aircraft models.

[0003] In applications requiring height adjustment, existing technologies primarily employ hydraulic lifting platforms or screw lifting platforms. While hydraulic lifting platforms can lift large loads, their synchronization is poor, and platform tilting is prone to occur when multiple cylinders are linked. Furthermore, hydraulic systems are susceptible to oil leaks, resulting in high maintenance costs and environmental pollution. Screw lifting platforms, while offering higher precision, typically use independent motors to drive each lifting mechanism. Synchronization control relies on electrical system coordination, leading to issues such as response delays and accumulated synchronization errors. Consequently, they struggle to meet the high precision and reliability requirements of aviation takeoff and landing scenarios demanding precise alignment. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides a lifting-type low-altitude vertical take-off and landing field, which overcomes the deficiencies of existing technologies. By combining mechanical synchronous transmission with intelligent measurement and control, it solves the problems of high-precision synchronization of multiple lifting points, smooth lifting and lowering, and safety protection.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A lifting-type low-altitude vertical take-off and landing field includes a foundation. Worm gear lifts are fixedly installed at the four corners of the foundation's upper surface. The top of each worm gear lift is fixedly connected to the bottom surface of a movable platform via a lifting screw. A drive motor is fixedly installed in the middle of the foundation's upper surface. The output end of the drive motor is connected to the input end of a first planetary gear reducer. The two output ends of the first planetary gear reducer are respectively connected to one end of two first transmission rods via couplings. The other end of each first transmission rod is connected to the input end of a second planetary gear reducer. The two output ends of the second planetary gear reducer are respectively connected to one end of two second transmission rods via couplings. The other end of each second transmission rod is coaxially connected to the worm gear of the worm gear lift via a coupling.

[0006] Preferably, a guide sleeve is fixedly embedded inside the foundation, and the lower end of the lifting screw slides in cooperation with the inner wall of the guide sleeve.

[0007] Preferably, a distance measuring sensor is fixedly installed on the upper surface of the base, and the sensing end of the distance measuring sensor faces the lower surface of the movable platform.

[0008] Preferably, a lower limit position switch and an upper limit position switch are fixedly installed on the upper surface of the foundation. The sensing end of the lower limit position switch faces the lower surface of the movable platform, and the sensing end of the upper limit position switch is located on the side of the foundation and faces downward. A contact rod is fixedly installed on the lower surface of the movable platform, and a trigger plate is fixedly installed at the lower end of the contact rod. The trigger plate is adapted to the sensing end of the upper limit position switch.

[0009] This invention provides a lift-type low-altitude vertical take-off and landing (VTOL) platform. It offers the following advantages: By employing a power distribution scheme using a single drive motor in conjunction with a first planetary gear reducer, a second planetary gear reducer, and a rigid transmission rod, power originates from a central point, is distributed to two branches via the first-stage reduction, and then precisely and equally distributed to the four actuators via the second-stage reduction. This "one-drive-four" synchronous mechanical transmission chain fundamentally ensures the absolute consistency of the input speed and phase of the four worm gear lifts, thereby driving the four lifting screws to achieve millimeter-level synchronous lifting. Compared to schemes using multiple independent motors or hydraulic cylinders, this completely eliminates the risk of platform tilting and jamming caused by electrical synchronization errors or uneven hydraulic system pressure, ensuring the absolute levelness and stability of the mobile platform throughout the entire lifting process, providing a crucial stable platform for aircraft take-off and landing. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in this utility model or the prior art, the accompanying drawings used in the description of the prior art will be briefly introduced below.

[0011] Figure 1 A schematic diagram of the structure of this utility model; Figure 2 A schematic diagram of the structure below the activity platform in this utility model; Figure 3 A schematic diagram of the structure of the lifting screw and guide sleeve of this utility model; Explanation of the labels in the diagram: 1. Foundation; 2. Worm gear jack; 3. Lifting screw; 4. Movable platform; 5. First planetary gear reducer; 6. First transmission rod; 7. Second planetary gear reducer; 8. Second transmission rod; 9. Guide sleeve; 10. Drive motor; 11. Distance sensor; 12. Lower limit position switch; 13. Upper limit position switch; 14. Contact rod. Detailed Implementation

[0012] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0013] Example 1, as Figures 1 to 3 As shown, a lifting-type low-altitude vertical take-off and landing field includes a foundation 1. Worm gear lifts 2 are fixedly installed at the four corners of the upper surface of the foundation 1. The top of each worm gear lift 2 is fixedly connected to the bottom surface of a movable platform 4 via a lifting screw 3. A drive motor 15 is fixedly installed in the middle of the upper surface of the foundation 1. The output end of the drive motor 15 is connected to the input end of a first planetary gear reducer 5. The two output ends of the first planetary gear reducer 5 are respectively connected to one end of two first transmission rods 6 via couplings. The other end of each first transmission rod 6 is connected to the input end of a second planetary gear reducer 7. The two output ends of the second planetary gear reducer 7 are respectively connected to one end of two second transmission rods 8 via couplings. The other end of each second transmission rod 8 is coaxially connected to the worm of the worm gear lift 2 via a coupling. In this embodiment, the control port of the drive motor 15 is connected to the control signal output of the control system. The control system adjusts the start / stop and speed of the drive motor to achieve precise control of the lifting action.

[0014] Working principle: When the control system issues an ascent command, the drive motor 15, fixedly mounted at the center of the upper surface of foundation 1, starts. The output torque of the drive motor 15 is first transmitted to the first planetary gear reducer 5. This reducer splits the input power in two, driving two first transmission rods 6 to rotate synchronously through its output ends and couplings. Each first transmission rod 6 further transmits power to a second planetary gear reducer 7. Each second planetary gear reducer 7 again splits the power in two, driving two second transmission rods 8 through its output ends. Finally, the four second transmission rods 8 are coaxially connected to the worm gears of the worm gear lifts 2 installed at the four corners of the platform, thereby synchronously driving the worm gears of the four worm gear lifts 2 to rotate synchronously.

[0015] The rotation of the worm gear in the worm jack 2 drives the worm gear reducer, which is converted into a huge lifting torque, driving the cooperating lifting screw 3 to move upward in a straight line. The tops of all the lifting screws 3 are rigidly connected to the movable platform 4, thus jointly propelling the movable platform 4 to rise vertically and smoothly. Similarly, during the descent process, the drive motor reverses, and the power is transmitted in the opposite direction through the same transmission path, driving the lifting screws 3 to retract, allowing the movable platform 4 to descend smoothly. The entire transmission chain uses a combination of rigid rods and planetary gear reducers, ensuring a high degree of synchronization and consistency in the power transmission at the four lifting points, fundamentally preventing the platform from tilting during the lifting process.

[0016] This invention employs a power distribution scheme using a single drive motor 15 in conjunction with a first planetary gear reducer 5, a second planetary gear reducer 7, and a rigid transmission rod. Power originates from a central point, is distributed to two branches via the first-stage reduction, and then precisely and equally distributed to the four actuators via the second-stage reduction. This "one-drive-four" synchronous mechanical transmission chain fundamentally ensures the absolute consistency of the input speed and phase of the four worm gear lifts, thereby driving the four lifting screws 3 to achieve millimeter-level synchronous lifting. Compared to schemes using multiple independent motors or hydraulic cylinders, this completely eliminates the risk of platform tilting or jamming caused by electrical synchronization errors or uneven hydraulic system pressure, ensuring the absolute levelness and stability of the mobile platform throughout the entire lifting process, providing a crucial stable platform for aircraft takeoff and landing.

[0017] Example 2, as Figure 3 As shown, in a further preferred embodiment, a guide sleeve 9 is fixedly embedded inside the foundation 1, and the lower end of the lifting screw 3 slides against the inner wall of the guide sleeve 9. Thus, during the lifting process, the guide sleeve 9, fixedly embedded in the foundation 1, provides radial constraint and sliding guidance for the lower end of the lifting screw 3, effectively suppressing possible swaying or lateral displacement of the screw, ensuring the straightness and stability of the lifting motion. The guide sleeve 9 bears most of the lateral force and bending moment acting on the lifting screw 3, preventing these harmful forces from being directly transmitted to the output mechanism of the worm gear jack 2 above. This greatly improves the reliability and service life of the worm gear jack, and reduces the failure rate and maintenance costs of core components.

[0018] In Example 3, as a further preferred embodiment of Example 1, a distance sensor 11 is fixedly installed on the upper surface of the foundation 1, with the sensing end of the distance sensor 11 facing the lower surface of the movable platform 4. In this embodiment, the signal output end of the distance sensor 11 is connected to the signal input end of the control system. The distance sensor 11 monitors the relative displacement between the movable platform 4 and the foundation 1 in real time, thereby accurately obtaining the real-time height data of the movable platform and feeding this information back to the control system. The control system performs closed-loop adjustment of the lifting screw drive device according to a preset program to ensure that the platform maintains synchronous and stable operation during lifting and accurately stops at the target height. The distance sensor 11 can also be used to monitor the platform for minor settlement or deformation when carrying an aircraft, providing timely warnings of structural anomalies and improving overall operational safety and intelligence. In addition, the feedback data from the distance sensor 11 can be linked with the platform load information for analysis to identify dynamic deformation trends caused by aircraft landing impact or wind load, further optimizing the control strategy.

[0019] In Example 4, as a further preferred embodiment of Example 1, a lower limit position switch 12 and an upper limit position switch 13 are fixedly installed on the upper surface of the foundation 1. The sensing end of the lower limit position switch 12 faces the lower surface of the movable platform 4, and the sensing end of the upper limit position switch 13 is located on the side of the foundation 1 and faces downward. A contact rod 14 is fixedly installed on the lower surface of the movable platform 4, and a trigger plate is fixedly installed at the lower end of the contact rod 14. The trigger plate is adapted to the sensing end of the upper limit position switch 13. The signal output ends of both the lower limit position switch 12 and the upper limit position switch 13 are connected to the signal input end of the control system. In this embodiment, the lower limit position switch 12 adopts a direct triggering method. When the movable platform 4 descends to its lowest position, its lower surface directly blocks or triggers the lower limit position switch 12 installed on the foundation. This method has the simplest structure, and the triggering position is the actual position of the platform, which is absolutely reliable. The upper limit position switch 13 achieves indirect sensing through the trigger plate at the end of the contact rod 14. When the movable platform 4 rises to its highest predetermined position, the contact rod 14 fixed to its lower surface moves upward synchronously, driving the trigger plate into the sensing area of ​​the upper limit position switch 13, thereby triggering a signal to ensure that the platform does not rise beyond its travel range. Through the coordinated operation of the lower limit position switch 12 and the upper limit position switch 13, dual limit protection is achieved for the lifting and lowering stroke of the movable platform 4, effectively preventing overtravel accidents caused by control system malfunction or drive device failure. The lower limit position switch 12 ensures reliable braking when the platform descends to its safe lowest point, preventing excessive descent and damage to the internal structure; the upper limit position switch 13 promptly cuts off the rising command when the platform reaches its designed maximum height, ensuring a safe clearance for the top working space. Together, they constitute a rigid safety boundary, improving the reliability and stability of equipment operation. Simultaneously, the signals from the upper and lower limit position switches are fed back to the control system in real time, participating in the operational logic judgment. Once triggered, the corresponding directional movement is forcibly stopped and an alarm is issued, ensuring basic safety protection is maintained even in the event of a malfunction. This dual limiting mechanism complements the ranging sensor 11, providing both high-precision continuous monitoring capabilities and physical-level rigid protection, significantly improving the equipment's adaptability and safety under complex working conditions.

[0020] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A type of low-altitude vertical take-off and landing field, characterized in that: The system includes a foundation (1), and a worm gear jack (2) is fixedly installed at each of the four corners of the upper surface of the foundation (1). The top of the worm gear jack (2) is fixedly connected to the bottom surface of the movable platform (4) through a lifting screw (3). A drive motor (10) is fixedly installed in the middle of the upper surface of the foundation (1). The output end of the drive motor (10) is connected to the input end of the first planetary gear reducer (5). The output ends on both sides of the first planetary gear reducer (5) are respectively connected to one end of two first transmission rods (6) through couplings. The other end of each first transmission rod (6) is connected to the input end of the second planetary gear reducer (7). The output ends on both sides of the second planetary gear reducer (7) are respectively connected to one end of two second transmission rods (8) through couplings. The other end of each second transmission rod (8) is respectively connected to the worm of the worm gear jack (2) through a coupling.

2. The lifting-type low-altitude vertical take-off and landing field according to claim 1, characterized in that: The foundation (1) is internally fitted with a guide sleeve (9), and the lower end of the lifting screw (3) slides in cooperation with the inner wall of the guide sleeve (9).

3. The lifting-type low-altitude vertical take-off and landing field according to claim 1, characterized in that: A distance sensor (11) is fixedly installed on the upper surface of the foundation (1), with the sensing end of the distance sensor (11) facing the lower surface of the moving platform (4).

4. The lifting-type low-altitude vertical take-off and landing field according to claim 1, characterized in that: A lower limit position switch (12) and an upper limit position switch (13) are fixedly installed on the upper surface of the foundation (1). The sensing end of the lower limit position switch (12) faces the lower surface of the movable platform (4), and the sensing end of the upper limit position switch (13) is located on the side of the foundation (1) and faces downward. A contact rod (14) is fixedly installed on the lower surface of the movable platform (4). A trigger plate is fixedly installed at the lower end of the contact rod (14), and the trigger plate is adapted to the sensing end of the upper limit position switch (13).

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