同步顶升液压系统设计及动态特性分析

Design and Dynamic Analysis of Synchronous Jacking Hydraulic System of Wk-35 Electric Excavator

针对矿山大型采矿设备WK-35电动挖掘机上下盘分离过程中,上盘载荷大且分布不均、顶升高度大、同步顶升精度要求高等特点。提出一种采用四点不均匀承载的液压同步顶升方式,结合适合非线性、时变性的复杂系统控制的模糊PID控制方法实现挖掘机上下盘分离的同步顶升。并基于WK-35电动挖掘机同步顶升液压系统,构建AMESim液压系统仿真模型进行动态模拟,分析结果表明不同负载的变化仅对最终稳定状态的液压缸活塞速度或油液流速产生影响,负重较小时,液压缸达到稳定时的速度相对更大;平衡控制阀与节流调速阀均能在0~1s内迅速达到稳定状态,有助于液压系统进入稳态时获得更好的响应性能。

In this paper,according to the characteristics of large load and uneven distribution of upper wall,large jacking height and high requirements for synchronous jacking precision in the separation process of the upper and lower wall of WK-35 electric excavator,a large-scale mining equipment in the mine,a hydraulic synchronous jacking method with four-point uneven load is proposed,which combines with the fuzzy PID control method which is suitable for nonlinear and time-varying complex system control to realize the synchronous jacking of excavator.Based on the synchronous jacking hydraulic system of WK-35 electric excavator,a simulation model of AMESim hydraulic system is built for dynamic simulation.The analysis results show that the changes of different loads only affected the piston velocity or oil velocity of the hydraulic cylinder in the final stable state.Both the balance control valve and the throttle speed control valve can quickly reach the stable state within 0~1s,which is conducive to better response performance when the hydraulic system enters the steady state.