大采高液压支架掩护梁失效模型建立及对策研究

Establishment of failure model for shield beam in large mining height hydraulic support and it’s countermeasures research

为提高液压支架使用可靠性,分析了ZY21000/38.5/83D型液压支架在煤矿井下的实际使用情况,对液压支架掩护梁常规模型进行了模拟仿真分析论证;垮落的顶板压在顶梁后端与掩护梁铰接位置且顶梁前端未接顶,液压支架达到顶梁与掩护梁机械限位位置,此时顶梁和掩护梁几乎处于一条直线呈高射炮状态时,在顶板周期来压作用下会对掩护梁结构造成损坏。据此提出了造成掩护梁失效的杠杆效应模型,并对该模型进行仿真模拟分析,得出了掩护梁在该杠杆效应模型下极易失效的结论。煤矿生产作业应避免液压支架尤其是大采高支架在该杠杆效应模型姿态下使用,最后提出了避免液压支架掩护梁发生失效的防范措施。

In order to improve the reliability of hydraulic support,the actual use situation of ZY21000/38.5/83 D hydraulic support was analyzed.The simulation model of hydraulic support shield beam was simulated and demonstrated.The fallen roof pressed at the back end of the top beam and the hinge beam and the front end of top beam is not connected.The hydraulic support reaches the mechanical limit position of top beam and shield beam.At this time,the top beam and the cover beam are almost in a straight line to form an anti-aircraft gun state.Damage to the shield beam structure caused by periodic pressure.Based on this,the leverage model for the failure of the shield beam is proposed and the simulation analysis of the model is carried out.The conclusion that the shield beam is easy to fail under the leverage model is obtained.Coal mine production operations should avoid the use of hydraulic supports,especially large mining height brackets,in this leverage model attitude.Finally,preventive measures to avoid failure of the hydraulic support shield beams are proposed.