挖掘机动臂势能回收系统蓄能器压力设计及试验  

Design and Experiment of Accumulator Pressure for Boom Potential Energy Recovery System of Hydraulic Excavator

作　　者：陈明东[1] CHEN Mingdong(College of Architecture Engineering,Qingdao Agricultural University,Qingdao Shandong 266109,China)

机构地区：[1]青岛农业大学建筑工程学院,山东青岛266109

出　　处：《机床与液压》2018年第11期119-122,共4页Machine Tool & Hydraulics

基　　金：青岛农业大学高层次人才科研基金项目(6631114320);国家863计划重点项目(2009AA044403)

摘　　要：为降低液压挖掘机整机能耗,提出一种以蓄能器为储能装置的液压挖掘机动臂闭式回路势能回收系统。以80k N级液压挖掘机为研究对象,基于系统工作原理,建立了能量回收系统电动机-泵/马达轴系力矩平衡模型,分析了蓄能器平均工作压力与负载压力的关系。结果表明:电动机-泵/马达轴系在电动机无功率输出工况力矩平衡时,液压蓄能器工作压力平均值约为动臂负载压力的2倍。并结合半载工况挖掘机动臂下降试验,确定8吨级液压挖掘机蓄能器最小和最大工作压力分别为16.04 MPa和19.56 MPa。In order to reduce the overall energy consumption of the hydraulic excavator,the potential energy recovery system of boom with closed-circuit of hydraulic excavator is proposed using to the energy storage equipment of hydraulic accumulator. 80 kN hydraulic excavator is selected as the study object. The torque balance equation of the shaft system of the motor-pump for energy recovery was established on the basis of the working principle of system,which showed that the average work pressure of accumulator is twice the load pressure of boom arm when the motor was not input power for the shaft system of motor-pump. The relation between the average accumulator work pressure and load pressure was analyzed in considering the torque balance equation of the shaft system of motor-pump.The results show that minimum and maximum work pressures are 16. 04 MPa和19. 56 MPa respectively for 8-ton hydraulic excavator according to the boom descending experiment under half load condition.

关 键 词：液压挖掘机 流体传动与控制 动臂势能 闭式回路 

分 类 号：TH137[机械工程—机械制造及自动化]