液压支架液控单向阀降柱冲击试验系统

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中图分类号：TD355.4 文献标志码：A

Abstract：A pilot-operated check valve lowering impact test system was designed to addressthe engineering requirementsof hydraulic support pilot-operated check valve impact tests under the high-stress and large-flow conditionsof large mining-height longwall faces.The test systemconsisted of twosubsystems：a hydraulic subsystem and a measurement and control subsystem.The core component of the hydraulic subsystem was a twostage booster cylinder with a stepped structure design，which was able to realize functions such as presure maintaining，pressurization，and unloading under the liquid supply of a conventional mine emulsion pump.Based on the structures of the loading chamber，high-pressure chamber，and slender orifice，the elastic energy storage effect during theunlockingprocess ofthepilot-operated checkvalvewasreproduced，providing testconditions closer to actual working conditions for impact tests.The measurement and control subsystem was built on virtual instrument technology，which，based on 100KS/s high-frequency acquisition，accurately captured the pressure changes during the test process.Through host computer software，remote control of the hydraulic system as well as data processing and analysis wereachieved，ensuring the safetyand automation of the test process.Taking an FDY1600/50 type pilot-operated check valve specimenas the tested valve，theresultsshowed that the test system reflected the characteristics of intense impact，rapid pressure relief，and stable flow unloading during the impact test of the pilot-operated check valve， which were consistent with the actual working condition test results.The system is able to reproduce the impact efect when the pilot-operated check valve performs a lowering action on the working face， providing intuitive data support for evaluating the performance of the tested valve.

Key words： column pilot-operated check valve; hydraulic support column lowering; lowering impact test： two-stage booster cylinder; elastic energy storage effect

0 引言

随着煤矿智能开采技术的发展，大采高工作面综采装备取得了重大突破[1-2]，以 8.8m 大采高液压支架[3]、 2000L/min 大流量乳化液泵站系统[4-5]等为代表的技术和装备已经逐步推广应用。（剩余8653字）