基于电液协调式液压挖掘机复合动作工况下能量回收系统研究

为实现液压挖掘机动臂与转台复合动作时的能量回收,提出一种基于蓄能器-液压马达-发电机的液压挖掘机电液协调式能量回收系统。在标准工况下的单个工作周期内对系统模型进行仿真分析,研究关键参数对系统节能效果的影响。结果表明:在参数合理匹配的情况下,此系统回转制动能量回收率为61.08%,动臂下降能量回收率为27.23%,综合能量回收率达到了44.79%,综合能量再利用率达到了47.37%,节能效果良好;在合理的范围内,选择初始容积小的蓄能器和排量小的回收马达能提高系统的能量回收率。

Study on Energy Recovery System for Electro-hydraulic Coordinated Hydraulic Excavator Compound Action

In order to realize the energy recovery of the compound action of the boom and turntable of the hydraulic excavator,an energy compound recovery system of hydraulic excavator boom and turntable based on accumulator hydraulic motor-generator was proposed.The system model was simulated and analyzed in a single working cycle under standard operating conditions.The influence of key parameters on the energy saving effect of the system was studied.The results show that under the condition of reasonable parameter matching,the energy recovery rate of the rotary brake is 61.08%,the energy recovery rate of the boom drop is 27.23%,the comprehensive energy recovery rate is 44.79%,and the comprehensive energy reuse rate reaches 47.37%,so a good energy saving effect is achieved.Within a reasonable range,the choice of a small initial volume of the accumulator and a small displacement of the recovery motor can improve the energy recovery rate of the system.