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为保障煤矿井下采煤工作面安全生产,需要时刻掌握液压支架的可靠性情况,以便及时维护和保养,使液压支架可靠性维持在较高水平。基于应力-强度干涉理论,建立液压支架结构疲劳动态可靠性分析模型,并结合使用现场实测压力数据与液压支架生产企业再制造情况,对某常用液压支架进行动态可靠性评估。结果表明:该模型适用于对液压支架可靠性进行概率解释;综合机械化采煤工作过程中,顶板周期来压使液压支架承受的不稳定载荷服从双峰正态分布;用16Mn的P-S-N曲线代替Q460计算剩余疲劳强度,可以获得可靠度的保守数值。
In order to ensure safe operation of coal mining face in coal mine, it is necessary to grasp the reliability of hydraulic support at all times so that the reliability of hydraulic support can be maintained at a high level in time. Based on the theory of stress-strength interference, a dynamic fatigue reliability analysis model of hydraulic support structure is established. Based on the field measured pressure data and the remanufacturing situation of the hydraulic support, the dynamic reliability of a common hydraulic support is evaluated. The results show that this model is suitable to explain the reliability of hydraulic support. During the process of mechanized coal mining, the unsteady load of hydraulic support is subjected to bimodal normal distribution during the period of top plate, and the PSN curve of 16Mn is used to replace Q460 Calculate the residual fatigue strength, you can get a conservative value of reliability.