Unmanned aerial vehicle low impact catapult pneumatic and hydraulic system

Abstract

The invention relates to an unmanned aerial vehicle low impact catapult pneumatic and hydraulic system which is composed of a main oil pump electromagnetic unloading overflow valve, a main oil pump, a main oil pump motor, a supplemented oil pump electromagnetic unloading overflow valve, a supplemented oil pump, a supplemented oil pump motor, a cartridge valve, a first one-way valve, a safety valve, a motor, an electric-hydraulic proportional cartridge valve, a second one-way valve, a safety and stop valve, a third one-way valve, an energy accumulator, a pressure reducing valve, a speed regulating valve, an electromagnetic change valve, a proportional overflow valve, a decelerating hydraulic cylinder, an oil tank and oil pipes communicated with each element. According to the unmanned aerial vehicle low impact catapult pneumatic and hydraulic system, the hydraulic motor is adopted so as to drive a winding drum mechanism, the shortages that a high-speed hydraulic cylinder is adopted by a traditional pneumatic and hydraulic system and thus technology is complex and machining difficulty is large are overcome; the hydraulic motor is controlled by a proportional valve and closed-loop control is conducted on the rotation speed of the hydraulic motor, so that the ejection with high reliability and low impact in a start stage is achieved, and the shortages that the traditional pneumatic and hydraulic system is large in impact and poor in reliability are overcome.

Description

technical field [0001] The invention relates to a UAV ejection device, in particular to a gas-hydraulic system of a UAV low-impact ejection device. Background technique [0002] The ejection mechanism is widely used in the military field, such as the launch of missiles and rockets, the launch of carrier-based aircraft, the ejection of drones, the ejection of lifesaving seats, and the ejection and launch of satellites from space stations, space shuttles or other aircraft. [0003] There are many ways to launch UAVs, such as hand throwing, airborne delivery, vehicle launch, ejection, rocket boosting, etc. Commonly used UAV ejection methods include elastic ejection, gas ejection, electromagnetic ejection and gas-hydraulic ejection. Elastic ejection uses the elastic force of elastic elements (such as rubber bands and springs) with strong stretchability as power to provide the acceleration required for take-off, which is suitable for light (small) drones; gas ejection refers to ...

AI Technical Summary

Problems solved by technology

[0004] However, the traditional UAV pneumatic-hydraulic ejection technology still has shortcomings. Firstly, the impact at the start-up stage is large, and it is difficult to realize stepless speed regulation; secondly, high-speed hydraulic cylinders are often used in the acceleration process, which is difficult to process and complicated.

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