Research On Thin Seam Shearer Reliability And Fatigue Life

In our country thin seam resources is rich and widely distributed, but how to achieve highefficiency mechanized mining is an urgent problem for the coal industry to be solved. As a thinseam coal mining machinery, thin seam shearers is developing towards high power, multi-motordrive and the chainless AC traction. Therefore it is particularly important to study the reliabilityand fatigue life of thin seam shearers.This paper is rely on a corporation’s project of “MG2*70/325-BWD type thin seam shearerkey parts and components reliability analysis”, based on Virtual Prototype Technology (VPT)and rigid-flex coupled multi-body system dynamics as well as fatigue cumulative damage theoryas the foundation. A co-simulation platform was constructed with the softwares of Pro/Engineer,ADAMS, ANSYS and nSoft, and then a rigid-flex coupled virtual prototyping model of shearerwith flex key parts were built. According to the thin seam shearer’s technical parameters andworking resistance, the value range of traction resistance has been derived, and then verified thecorrectness of the coefficient of traction resistance set on the dynamics simulation analysis.Based on the matlab programming, obtained the load files of four conditions which is cuttingcoal, cutting roof, cutting bottom and cutting inclusions. Then import these load files to theADAMS and through dynamics simulation analysis results found out that in strength aspects theVon Mises Stress of each part is worst in the cutting feed stage while during the smooth stage itis small. At the same time found out that the structure of the haulage secondary planet carrier isthe most weak. In stiffness aspects, shearer shells’ deformations are large, and the cutting unitplanet carrier mainly happens bending deformation and torsional deformation while the haulageunit planet carrier mainly happens torsional deformation. Then proposed optimization measuresfor haulage unit shell and the secondary planet carrier according to contrast the simulation results.Using key nodes’ Von Mises Stress of flex components gained from dynamics simulation resultsas the original loads. These orginal loads would be used for fatigue life analysis target load spec-trum after rain flow and outside push. Through the fatigue life analysis we have got all compo-nents’ minimum fatigue life repeats and contour under the cutting coal conditions. The simula-tion results show that the fatigue life repeats of various components is directly related to themaximum load, RMS and material properties.This paper provides a new approach for people to research equipment’s stress, deformation,and fatigue life while the equipment’s rigid components in large overall motion and flex compo- nents in small deformation motion. Based on this method we can greatly shorten the product de-velopment cycle, extend the product life, reduce development costs and improve the economicefficiency of enterprises.