大流量换向阀缓冲结构参数优选与试验研究

针对液压支架用换向阀出现的断裂现象，分析其结构与工作原理，在此基础上建立其数学模型。联合AMESim软件与ANSYS/LS DYNA软件模拟研究阀套缓冲阻尼直径对其开启过程机械冲击特性的影响。仿真结果显示，当阀芯开启时，阀套上存在强烈的瞬态机械冲击应力。根据仿真结果对阀套上缓冲阻尼直径进行了优化，优化后阀套上的最大冲击应力降低了52.7%。换向阀疲劳试验结果显示，优化后的阀芯寿命提高了38.3%。该研究为支架用换向阀的可靠性设计提供了一定的参考。

Optimization of the Buffer Damp on a Large Flow Directional Valve and the Experimental Investigation

Based on the fracture problem of the directional valve used on the hydraulic roof support, the structure and the working principle of the valve were analyzed, and the mathematic model of the valve was also established. The influence of buffer damp diameter on the mechanical shock of the valve was studied through a combination of AMESim and ANSYS/LS DYNA. The simulation results indicate that there is a strong mechanical shock stress on the valve sleeve when the valve opens. The buffer damp diameter was optimized according to the simulation results. The maximum shock stress on the valve sleeve decreases by 52.7%. The fatigue experiment was carried out and the results show that the service life of the optimized valve increases by 38.3%. The work provides a valuable reference for the reliability design of the valve used on the hydraulic roof support.