掘进机摇臂升降液压系统性能分析及优化

Performance Analysis and Optimization of Hydraulic System of Rocker Arm Lift for Roadheader

针对掘进机摇臂升降液压系统中密封件易损坏,造成升降油缸无法自锁,摇臂自行下落的问题,研究了摇臂升降液压系统及元件工作原理,建立AMESim模型,分析动态特性,发现摇臂升至极限瞬间产生液压冲击是造成密封件损坏的根本原因,通过增大油缸内截面,降低平衡阀和溢流阀的开启压力,可有效降低液压冲击的瞬间峰值,延长了密封件使用寿命。

Roadheader arm lift hydraulic system seals are often damaged, resulting in the lift cylinder can not be self-locking and self-rocker whereabouts failure. This paper studies the lifting arm hydraulic systems and compo- nents of the operating principle and establishes its AMESim model to analyze the dynamic characteristics. It is found that the impact of hydraulic pressure when the rocker arms rise to the limit position is the root cause of the damage of the seal. By increasing the section area of the cylinder and reducing the opening pressure of the balance valve and the relief valve, the instantaneous peak value of hydraulic shock can be effectively reduced. Practice has proved that the hydraulic system has been optimized to prolong the service life of the seal.