回液断路阀流量冲击特性分析

Analysis of Flow Impact Characteristics of Return Circuit Breaker

针对液压支架回液断路阀流量冲击问题,在分析回液断路阀大流量特性基础上,结合元件实际结构尺寸,建立了AMESim仿真模型,给出了流量冲击状态下的阀芯冲击特性,并据此实现了回液断路阀阀芯的冲击疲劳性能计算,给出了有效的解决措施。分析结果表明:由于液压支架立柱千斤顶较大的面积比,在大流量乳化液泵作用下,在液压支架降柱、千斤顶缩回等工况时会使回液断路阀形成流量冲击;且冲击流量越大,阀芯冲击力也越大,冲击速度和冲击加速度也越大;在冲击流量产生的交变应力以及阀芯台肩处的圆角应力集中综合作用下会导致阀芯疲劳损坏。

Aiming at the problem of flow impact of hydraulic support return circuit breaker,based on the analysis of large flow characteristics of return circuit breaker,combined with the actual structural dimensions of components,the AMESim simulation model was established,the impact characteristics of valve core under flow impact state were given,the impact fatigue performance calculation of return circuit breaker valve core was realized based on this,and effective solutions were given.The analysis results show that due to the large area ratio of the hydraulic support column jack,under the action of the large flow emulsion pump,when the hydraulic support column is lowered and the jack is retracted,the flow impact of the return circuit breaker will be formed;the greater the impact flow,the greater the impact force of the valve core,and the greater the impact speed and impact acceleration;under the combined action of the alternating stress generated by the impact flow and the fillet stress concentration at the valve core shoulder,the valve core fatigue damage will be caused.