Operating Characteristics and Energy Efficiency of Hydraulic-gas Combined Driving Hydraulic Excavator Boom

doi:10.3901/JME.2017.20.176

Abstract

Abstract: In the hydraulic excavator operation process, potential energy of large mass stored in lifting phase is converted into heat energy and dissipated, which not only wastes energy, but also increases the temperature of the hydraulic oil. Additional cooling equipment is required to reduce the temperature so the cost and complexity of the machine is increased. In order to solve the above problems, the potential energy recovery method of hydraulic-gas self-weight balancing using three-chamber hydraulic cylinder is proposed on the basis of the load sensing driving circuit. A chamber of the three-chamber cylinder is directly connected with a hydraulic accumulator in order to store and reuse the potential energy of the boom. Based on the simulation results, a prototype of hydraulic excavator based on three-chamber hydraulic cylinder is established. The operating characteristics and energy efficiency characteristics of the boom driven by two-chamber hydraulic cylinder and the three-chamber hydraulic cylinder are studied experimentally. The test results show that the stability of the system is improved after adding a hydraulic-gas storage chamber and 48.57% of the energy consumption could be reduced as well as 64.76% of the peak power could be reduced. The energy saving effect is remarkable. The new method can also be used in various types of heavy lifting devices driven by hydraulic cylinders.

Key words: hydraulic-gas energy storage, potential energy recovery, three-chamber hydraulic cylinder

CLC Number:

TH137

XIA Lianpeng, QUAN Long, ZHANG Xiaogang, XIONG Xiaoyan, WANG Yongjin. Operating Characteristics and Energy Efficiency of Hydraulic-gas Combined Driving Hydraulic Excavator Boom[J]. Journal of Mechanical Engineering, 2017, 53(20): 176-183.

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