Research on Characteristics of Heavy-load Lifting Machinery Based on Hydraulic-gas Energy Storage and Closed Displacement Controlled System

doi:10.3901/JME.2019.16.213

Abstract

Abstract: When the heavy-load lifting machinery using variable speed displacement controlled cylinder system moves downwards, if there are no braking resistors or energy recovery device, the system will not be controlled due to that the electrical motor can't sustain reverse load. However, the braking resistors consumes the generation energy of electrical motor, decreases the energy efficiency of the system and increases the heat dispassion burden. In order to solve the above problems, a closed displacement controlled three-chamber cylinder system of heavy-load lifting system based on hydraulic-gas energy storage is proposed. In the system, hydraulic pump is connected with the rod-less chamber and rod chamber of the three-chamber cylinder to control the lifting machinery to move. The weight balancing chamber of the three-chamber cylinder connected with an accumulator balances the weight of the lifting machinery to directly recycle the potential energy, which can improve the energy efficiency and the operation performance of the system. To research the working performance and energy efficiency of the system, it is used to control the boom of a hydraulic excavator. The parameters of the three-chamber cylinder and the accumulator is determined firstly and then the control strategy of the proposed system is designed. Finally, the test platform of the hydraulic excavator boom controlled by the proposed system is built and the system feasibility is validated. The testing results show that appropriate accumulator pressure not only can realize the boom potential energy recycling to improve the system energy efficiency, but also can keep the electrical motor working in motoring condition to improve the system controllability. Compared with the three-chamber cylinder controlled by the load-sensing system, the output energy of the hydraulic pump in the proposed system decreases by 27.2%.

Key words: closed displacement control system, energy recycling, hydraulic excavator, hydraulic-gas energy storage driving, three-chamber cylinder

CLC Number:

TH137

HAO Yunxiao, XIA Lianpeng, QUAN Long, ZHAO Bin, CHENG Hang, XIONG Xiaoyan. Research on Characteristics of Heavy-load Lifting Machinery Based on Hydraulic-gas Energy Storage and Closed Displacement Controlled System[J]. Journal of Mechanical Engineering, 2019, 55(16): 213-219.

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