Research on Energy Saving Characteristics of Large Hydraulic Excavator Boom Driven by Dual Hydraulic-gas Energy Storage Cylinder

doi:10.3901/JME.2019.20.240

Abstract

Abstract: There is a lot of gravitational potential energy waste in the working process of hydraulic excavators, which seriously affects the efficiency of the whole machine and causes large emission pollution. Aiming at the large hydraulic excavator of which the boom is driven by dual hydraulic cylinders, the principle of double hydraulic-gas energy storage cylinders driving the hydraulic excavator's boom and integrating driving and potential energy recuperation is proposed to reduce the energy consumption and emission of hydraulic excavators. In the implementation, the original two-chamber hydraulic cylinders are replaced by three-chamber hydraulic cylinders with energy storage chambers, and the energy storage chambers are directly connected with the hydraulic accumulator. The self-weight of working device is balanced by the initial hydraulic pressure of the hydraulic accumulator, and the gravitational potential energy is directly recuperated. Firstly, the parameters of three-chamber hydraulic cylinders and the hydraulic accumulator are designed according to the operation characteristics of 36 tons large hydraulic excavator and the variation of gravity potential energy. Then the digital prototype is further established. Through the simulation study of the proposed system, the hydraulic pump output flow and the valve port parameters of the control valve are re-matched. The flow control strategy of compound action with swing is modified, and the energy saving effect of the hydraulic-gas energy storage driving system is preliminarily verified. A test prototype is constructed according to the foundation. The 90-degree standard loading cycle tests show that compared with the existing hydraulic excavators of the same type, in the case of meeting the same digging force, the working efficiency of the excavator increases by 20.7% and the fuel consumption decreases by 17.1%. In terms of 8 hours of work per day, a single excavator can save fuel up to 47 L per day and reduce carbon dioxide emissions by 123.6 kg.

Key words: excavator, boom, energy saving and emission reduction, three-chamber hydraulic cylinder, hydraulic-gas energy storage driving, integrated drives, hydraulic accumulator

CLC Number:

TH137

XIA Lianpeng, QUAN Long, CAO Donghui, YIN Manyi, LIU Qiming, LI Zepeng. Research on Energy Saving Characteristics of Large Hydraulic Excavator Boom Driven by Dual Hydraulic-gas Energy Storage Cylinder[J]. Journal of Mechanical Engineering, 2019, 55(20): 240-248.

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