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유압 비례제어 밸브와 유압실린더를 이용한 액화질소 펌프의 왕복동 구동
유공압건설기계학회 유공압건설기계학회 2024 유공압건설기계학회 학술대회논문집 Vol.2024 No.5
This study focuses on the development of a closed-loop controlled hydraulic system designed for the efficient transport and storage of liquefied hydrogen. Given the high energy density and the environmentally friendly nature of hydrogen, the research emphasizes the need for advanced technologies capable of handling hydrogen in its liquefied form at high pressures. The core of the system is a reciprocating plunger pump, deemed suitable for pumping liquefied hydrogen due to its ability to operate at pressures exceeding 90 MPa. This is crucial for charging vehicles' hydrogen tanks, which require gaseous hydrogen at 75 MPa. To achieve precise control over the pump operation, the study employs a double-rod hydraulic cylinder driven by a sinusoidal motion, with its displacement being continuously monitored and fed back to a hydraulic proportional directional control valve. This valve, characterized by its feedback mechanism for spool position and built-in signal amplification, ensures smooth and shock-free operation across all ports during the reciprocating motion of the pump. The paper details the specifications of both the proportional control valve and the double-rod cylinder, highlighting the importance of maintaining oil viscosity within a specified range under varying temperatures to ensure efficient operation. Through experimental setups using liquefied nitrogen, the study showcases the system’s capability to handle no-load conditions effectively, simulating the operational demands of liquefied hydrogen pumping. Conclusively, this research presents a sophisticated hydraulic system capable of meeting the high-pressure requirements for liquefied hydrogen transport and storage, promising to advance the infrastructure needed for hydrogen fueling stations. The findings contribute to the broader efforts of integrating hydrogen as a sustainable and clean energy resource, particularly in the transportation sector.
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Design and Performance Test of a Rotary Actuator for Side Tilting Excavator Bucket
박민수(Min Su Park),이준석(Jun Seok Lee),김도엽(Do Youp Kim),이응석(Eung Suk Lee) Korean Society for Precision Engineering 2017 한국정밀공학회지 Vol.34 No.1
Generally, a working excavator has only one directional bucket tilting angle, which is up-forward. However, side direction rotation of the bucket would allow variety of working output. We designed a hydraulic rotary actuator comprising a double rod hydraulic cylinder with a rack-pinion gear set for use in excavator bucket with side tilting mechanism, thus converting the linear to angular motion. The proposed side tilting rotary actuator was designed with parts suitable for medium size of heavy duty excavator. These mechanical parts were inexpensive to purchase and the manufacturing cost was reasonable. The proposed mechanism is potentially useful for excavator with variety of working output.
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