矿井液压支架在动态力学条件下的结构强度分析研究

随着采矿深度的增加，矿井液压支架的运行状况逐渐恶化。液压支架的立柱和平衡千斤顶都被视为刚性结构部件，关系到液压支架的安全性，为了提高液压支架的可靠性，建立了基于刚性—柔性耦合的液压支架的刚度可变冲击动力仿真平台。首先，模拟了平行表面荷载、上升表面荷载和下荷载作用于上梁时液压支架的应力状态，识别了不同铰接缝的临界载荷；其次，发现了不同铰链接头对应的危险冲击位置；最后，总结了冲击荷载对液压支架应力状态的总体影响。结果表明，在6 000 kN冲击载荷下，支顶掩护梁铰接点最大力变化系数10.5，是最危险的铰接位置。

Analysis and research on structural strength of mine hydraulic supports under dynamic mechanical conditions

With the increase of mining depth，the operating conditions of mine hydraulic supports have gradually deteriorated.Since the column and the balance jack are regarded as rigid structural components，it is related to the safety of the hydraulic support.In order to improve the reliability of the hydraulic support，a rigid-flexible coupling hydraulic support dynamic simulation platform with variable stiffness was established.Firstly，the stress state of the hydraulic support when the parallel surface load，the rising surface load and the down load act on the upper beam were simulated，and the critical loads of different hinge joints were identified.Secondly，the dangerous impact positions corresponding to different hinge joints were discovered.Finally，the overall influence of the impact load on the stress state of the hydraulic support was summarized.The results showed that under an impact load of 6 000 kN，the maximum force variation coefficient of the hinged point of the supporting shield beam is 10.5，which is the most dangerous hinged position.