适应液压支架动作的稳压供液技术研究

Research on stabilized pressure hydraulic fluid supply technology adapted to hydraulic support action

为提高工作面液压支架对采煤机的跟随能力,通过对支架供液过程的理论分析,揭示了支架动作速度与液压系统压力和供液流量的耦合关系;建立了工作面液压系统仿真模型并验证了模型的准确性,仿真分析了液压系统压力和供液流量对支架动作速度的作用规律;在此基础上,提出了一种适应支架动作的稳压供液技术,即以支架动作类型和液压系统压力限值等条件为判断依据,通过调整供液流量,使支架动作时液压系统压力缓慢平稳变化、略微上升,以提高支架动作速度。采用多泵+多变频供液系统对该技术进行了试验,结果验证了该技术的有效性。

In order to improve ability of hydraulic support following shearer in working face,coupling relationship among support action velocity,hydraulic system pressure and flow rate of hydraulic fluid supply was revealed by theory analysis of support hydraulic fluid supply process.Simulation model of hydraulic system on working face was established and correctness of the model was verified.Effect of hydraulic system pressure and flow rate on support action velocity was analyzed,and a stabilized pressure hydraulic fluid supply technology adapted to support action was proposed.The technology takes support action type and hydraulic system pressure limitation as criterion,and realizes slow and steady changing process of hydraulic system pressure with slight rise during support action by adjusting flow rate,so as to improve support action velocity.The technology was tested by use of multi-pump and multi-frequency hydraulic fluid supply system,and validity of the technology was verified.