| Rock burst is a kind of sudden destruction of coal and rock mass,which causes a lot of property loss and heavy casualties to coal mine production.At present,the roadway support method of hydraulic support is generally used to reduce the loss caused by rock burst.However,the anti impact ability of hydraulic support is insufficient,which is prone to impact failure.Therefore,it is of great significance to study an energy absorbing component which can improve the anti impact ability of hydraulic support.According to the technical parameters of ZHDF4150 anti impact hydraulic support,this paper designs a kind of square thin-walled tube energy absorption component with guiding groove applied to the support column,establishes the theoretical analysis model of the thin-walled energy absorption component,designs the basic parameters and the induction groove parameters of different schemes of thin-walled energy absorption components;carries out the impact crushing simulation and quasi-static for the thin-walled energy absorption components with different guiding groove parameters The energy absorbing and anti impact performance parameters are analyzed.Finally,the optimization design is carried out.Through the finite element simulation,the thin-walled energy absorbing member with square cross-section shape,semicircular guiding groove and 80mm guide groove spacing is determined as the research object.After that,the finite element models of thin-walled energy absorbing components with different structural parameters of induction slot are established and compared.By analyzing the initial peak force,energy absorption,average support reaction force,effective displacement and crushing force efficiency,three thin-walled energy absorbing components with induction slot length of 80mm,radius of 2.5mm and number of 3 are selected.The experimental results show that:through the analysis of the initial peak force,energy absorption,average reaction force,effective displacement,crushing force efficiency,three thin-walled energy absorbing components with induction slot length of 80mm,radius of 2.5mm and number of them are selected respectively,and the energy absorption difference between the energy absorbing component with induction slot and the energy absorbing component without slot is very small,the experimental results are basically similar to the simulation results,The reliability of the simulation is verified.Finally,the abnormal experimental results of thin-walled energy absorbing components are analyzed.According to the analysis of multi factor optimization design results,when the number of inducers is 2,the length is 85.1 mm and the radius is 1.9 mm,it is the optimal solution. |
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