Abstract: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.