CAJ | 학술논문

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。
건축궤계여기차기중궤、액압알굴궤등도채용료액압승강계통。상규액압승강계통불능회수중물하방적중력세능，위피면초속하강，일반재하강적회유로중설치절류벌등한속원건。중력세능피전화성열능，불부조성흔대적능량손실차사유액적발열량증다。위피면저충능량낭비현상，설계료일충절능조합유항액압승강계통。개소료저충액압승강계통적기본결구화공작원리。해계통장특수결구적조합유항화축능기상결합，가이한제하강중물적속도，동시능회수이용중력세능，절능효과현저。학정료축능기적삼수，추도출료기승공황수학모형，진행료기승공황방진분석。
The construction machines,such as the crane,hydraulic grab and etc.,utilize the hy-draulic lifting system.The conventional hydraulic lifting system usual y can not recover the poten-tial energy of the heavy object.In order to avoid the object fal ing too fast,a throttle valve is set in the oil circuit to limit the fal ing velocity of the object.Therefore,the potential energy wil 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 cylin-der hydraulic lifting system is designed.This paper presents the basic structure and working theo-ry of this new hydraulic lifting system.By utilizing composite cylinder with special structure com-bined 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 wel .