节能组合油缸液压升降系统研究（英文）

Study on energy-saving composite cylinder hydraulic lifting system

建筑机械如汽车起重机、液压挖掘机等都采用了液压升降系统。常规液压升降系统不能回收重物下放的重力势能,为避免超速下降,一般在下降的回油路中设置节流阀等限速元件。重力势能被转化成热能,不仅造成很大的能量损失且使油液的发热量增多。为避免这种能量浪费现象,设计了一种节能组合油缸液压升降系统。介绍了这种液压升降系统的基本结构和工作原理。该系统将特殊结构的组合油缸和蓄能器相结合,可以限制下降重物的速度,同时能回收利用重力势能,节能效果显著。确定了蓄能器的参数,推导出了起升工况数学模型,进行了起升工况仿真分析。

The construction machines,such as the crane,hydraulic grab and etc.,utilize the hydraulic lifting system. The conventional hydraulic lifting system usually can not recover the potential energy of the heavy object. In order to avoid the object falling too fast,a throttle valve is set in the oil circuit to limit the falling velocity of the object. Therefore,the potential energy will be converted into the thermal energy,which not only brings the energy loss and also could cause some thermal problems. In order to avoid the loss of energy,an energy-saving composite cylinder hydraulic lifting system is designed. This paper presents the basic structure and working theory of this new hydraulic lifting system. By utilizing composite cylinder with special structure combined with accumulator,this system can limit the lowering velocity of heavy object and also could recover the potential energy of the object being lowered. Thus,this system has remarkable effect of energy-saving. The parameters of the accumulator used in this system are determined. The mathematical model of lifting condition is proposed,and the simulation analysis of lifting condition is conducted as well.