Research On Failure Analysis And Remanufacturability Evaluation Method Of Hydraulic Support Structures

At present,the number of hydraulic supports in my country is relatively large.After years of development,most of the hydraulic supports in service have reached or are about to reach the scrapping stage.How to scientifically dispose of these retired hydraulic supports is particularly urgent.Based on the principles of green environmental protection,high-quality material saving,high efficiency and energy saving,and remanufacturing engineering by means of advanced manufacturing technology,it provides new ideas for the follow-up treatment of decommissioned hydraulic supports.In order to ensure the stable and reliable performance of the hydraulic support after remanufacturing,the failure analysis and remanufacturability evaluation of the structural parts before remanufacturing are particularly important.The former provides a basis for remanufacturing technology selection and product optimization,while the latter provides a comprehensive evaluation of the residual value attributes of structural parts.Aiming at the failure analysis and remanufacturing evaluation of hydraulic support before remanufacturing,the research contents of this paper are as follows:First,from the perspective of space mechanics,considering the influence of different working conditions on the hydraulic support,the analytical expression of the hydraulic support under the space force state is established.Based on the dynamic simulation software Adams,a rigid body model of the hydraulic support was built,and the stress state of the pin-shaft connection under the top beam torsion-base torsion condition was calculated.for bad.Secondly,considering the structural design of the hydraulic support and the influence of the working conditions in the actual working environment,a three-dimensional finite element model is established considering different stress conditions;through the strength analysis of the hydraulic support structure,from the perspective of the working environment of the hydraulic support,it is found that the support is in danger The state is related to the eccentric load,torsion and diagonal working conditions;it is found that the high stress of the bracket is distributed in the local area through the analysis of the obtained stress nephogram and the collection of high stress points.According to the simulation results,the failure modes and causes of the main structural parts of the hydraulic support under various working conditions are summarized.The research results can provide theoretical reference for the optimization of remanufactured structures.Furthermore,based on the mechanical analysis of each structural part of the hydraulic support,the stable force of the pin hole of the base is obtained;based on the Hertzian contact theory,a theoretical model of the contact stress at the pin hole is established;considering the material nonlinear plastic deformation analysis theory,the contact stress at the pin hole is analyzed.,deformation and plastic strain.It is found that under the conditions of canopy torsion and base torsion,the contact stress of the pin joint connection exceeds the yield limit of the material,and the contact stress distribution results have strong nonlinearity;the stress and plastic strain of the pin hole are mainly concentrated in the contact part of the front end of the pin hole.The research results can provide a theoretical reference for the optimal design of the pin joint connection of the hydraulic support.Finally,starting from the remanufacturing technology roadmap,the technical route of the hydraulic support remanufacturing and the process requirements before remanufacturing are analyzed;according to the durability performance requirements of the general technical conditions of the hydraulic support,six composite working conditions are selected,and the hydraulic support is calculated by n Code Design Life.Based on the fatigue life under the durability test and the number of used cycles,the remaining life of the hydraulic support was calculated.The research results can provide a reference for subsequent remanufacturing evaluation.Starting from the three aspects of technology,environment and economy,according to the technical route of stent remanufacturing,the calculation formulas of evaluation indexes based on intermediate reference indexes were established respectively.Combined with the analysis of the remaining life,a comprehensive evaluation model of the remanufacturability of the whole hydraulic support machine is established through the evaluation indicators of various influencing factors.