为提高工作面支架对采煤机的跟随特性,以支架运行过程不同动作供液需求特征为研究起点,基于工作面支架系统的液压原理,利用AMESim建立了支架液压系统的数学仿真模型。通过仿真液压支架动作的供液过程,分析总结了供液流量对支架动作速度和过程压力的作用规律,并提出了适应支架动作的稳压供液理念。通过理论分析稳压供液过程特性,推导出适应支架动作的稳压供液流量的数学计算公式,该公式表明:同一支架液压系统下,稳压供液流量主要由支架动作类型、动作行程、动作数量、卸载阀压力设定等因素决定。最后,在仿真模型中验证稳压供液技术,对比液压支架运行过程的额定供液与稳压供液方案效果,结果表明:稳压供液技术不仅保证了支架动作快速执行,同时减少了系统压力波动,减缓了支架液压系统的压力冲击。

In order to improve the following performance of working face supports after the shearer,taking the hydraulic fluid feeding characteristic of different actions during support operation as the starting research point,a mathematical simulation model for support hydraulic system has been built employing AMESim based on the hydraulic principle of face supports. By simulating the hydraulic fluid feeding during support action,the functional rule of the supply fluid flow-rate on the support action speed and the process pressure have been analyzed and summarized,and the concept of fluid feeding with steady pressure for adapting supports actions is proposed. Furthermore,by theoretically analyzing the characteristics of fluid feeding with steady pressure,a mathematical formula of its supply flow-rate for adapting support actions is derived. The formula shows that this flow rate is mainly determined by the type of support action,the advance distance for each support action,the number of support actions and the pressure setting of the unloading valve in the same support hydraulic system. At last,fluid feeding technology with steady pressure has been validated in the simula- tion model. By contrasting the result of setting feeding scheme with that of steady pressure feeding scheme during the hydraulic support operation,the results show that the fluid feeding technology with steady pressure not only ensures the quick implemention of the support action,but also reduces the system pressure fluctuation and mitigates the pressure impact of the support hydraulic system.