液压支架关键部件失效分析与寿命评估研究进展

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.