Research Progress on Failure Analysis and Life Assessment of Key Components in Hydraulic SupportsEI北大核心CSCD

煤矿综采液压支架是控制采煤工作面矿山压力的大型核心装备，是现代采煤作业安全防护、作业空间扩大和采煤效率提高的关键，主要由液压件(立柱、千斤顶)、承载结构件(顶梁、掩护梁和底座等)、推移装置、控制系统和其他辅助装置组成，往往在极其恶劣复杂的矿井环境中服役，局部容易发生变形损伤、疲劳和腐蚀。对其关键部件进行失效分析及剩余寿命评估，是推动整机再制造和促进绿色循环经济发展的基本前提条件。对顶梁、底座、连杆、立柱等关键部件的失效形式及原因进行综述与分析，指出结构件的失效原因分析需要受到更多关注。总结支架寿命评估的研究现状，指出目前的研究集中在设计阶段的强度校核和寿命预估上，而关于服役了一段时间的支架的剩余寿命研究仍是空白。最后提出基于断裂力学利用有限元模拟进行剩余寿命评估的发展趋势。

Research Progress on Failure Analysis and Life Assessment of Key Components in Hydraulic Supports

Fully mechanized hydraulic supports are the large-scale core equipment controlling the pressure of coal mining face. Hydraulic supports are crucial for protecting the safety of modern coal mining operation, expanding the working space and improving the efficiency of coal mining. Commonly, hydraulic supports are mainly composed of hydraulic parts (column and jack), bearing structures (top beam, shield beam, base support and so on), pushing equipment, controlling system and other auxiliary equipment. Hydraulic supports are often used in extremely harsh and complex mining environments, in such a case, local mechanical deformation and damage injury, fatigue and corrosion often take place. Failure analysis and residual life assessment on the key components in hydraulic supports are the prerequisite to promote the remanufacturing of the whole machine and the development of green circular economy. The failure behaviors of key components in hydraulic supports, such as, top beams, base supports, connecting rods and columns are summarized and analyzed, and it is pointed out that the failure cause analysis of structural components needs more attention. The research status on life assessment is also discussed. The current research focuses on the strength check and life prediction in the design stage, while the research on the remaining life of the support that has been in service for a period of time is still blank. Furthermore, the trend of residual life assessment by using finite element method is put forward.