Research on the Method of Hydraulic-gas Energy Storage Balancing Hydraulic Excavator Boom Weight

doi:10.3901/JME.2018.20.197

Abstract

Abstract: When hydraulic excavator works, its boom moves upwards and downwards frequently. Because the existing excavator doesn't have energy recovery unit, huge amount of boom potential energy will be wasted through control valve throttling effect when the boom moves downwards. Therefore, the method of the hydraulic-gas energy storage balancing boom self-weight is analized, and a principle of the excavator's gravitational potential energy directly conversation and utilization system with three-chamber cylinder is proposed to recycle this wasted energy. On the basis of double-chamber cylinder, the three-chamber cylinder is formed by dividing the rod-less chamber of the double-chamber cylinder into two chambers. One of the two chambers known as weight balancing chamber is connected with an accumulator. The boom weight can be basically balanced by setting the pressure of the accumulator. The energy consumption mathematical model of the boom driving system is established firstly to analyse the system energy characteristics. Secondly, the integrated hydro-mechatronics co-simulation model of a 20 t hydraulic excavator is built, and then the boom's operational and energy characteristics are simulated and compared when the double-chamber cylinder driving system and the three-chamber cylinder driving system are used respectively. Finally, the test platform is built and the feasibility and the energy-saving effect of the proposed system are validated. The research results show that, compared with the double-chamber cylinder driving system, the energy recovery and reutilization rate of the proposed system reaches to 68% and the energy-saving effect is remarkable. This method is also suitable for all kinds of hydraulic lifting mechanisms.

Key words: energy saving, hydraulic excavator, hydraulic-gas energy storage driving, mechanical arm, potential energy recovery, three-chamber cylinder

CLC Number:

TH137

XIA Lianpeng, QUAN Long, YANG Jing, ZHAO Bin. Research on the Method of Hydraulic-gas Energy Storage Balancing Hydraulic Excavator Boom Weight[J]. Journal of Mechanical Engineering, 2018, 54(20): 197-205.

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