Reliability And Sensitivity Analysis Of Power Transmission System Of Coal Mining Machine

Although the domestic shearer can basically meet the production needs of domestic coal enterprises,there is still a big gap compared with the world's advanced shearer,which is mainly reflected in the aspects of shearer intelligence,failure rate,overall performance,service life of parts,etc.How to reduce the gap with foreign shearers has become the primary problem,and one of the important research contents is to improve the reliability of shearer parts.Aiming at the reliability of the power transmission system of the shearer,this paper studies the mg500-wd power transmission system of the shearer.In order to study the reliability of the power transmission system of the shearer,this paper establishes its lumped mass model,through which the stress between the components of the power transmission system of the shearer is calculated,and through the stress analysis,the most vulnerable failure is determined Then,the reliability and reliability sensitivity of the most vulnerable components are studied.The specific contents of this paper are as follows:(1)the rocker arm transmission system is simplified as a gear rotor bearing system,its lumped mass model is established,its system state differential equation is solved,and the meshing displacement between each gear is obtained,and then the meshing force between each gear pair is calculated accordingly.Finally,according to the meshing force,the tooth root bending stress and tooth surface contact stress are obtained according to the formula of tooth bending stress and contact stress.(2)according to the contact stress of gear tooth surface,the fatigue life of gear 1 and gear 2 at the input end of shearer is estimated by using the linear correction method and the linear accumulation damage rule,and then the random fatigue life and parameter variable database of gear 1 and gear 2 are obtained by Latin sampling.The function relationship between the fatigue life and the random parameter variable is fitted by using the neural network,and the resistance of gear 1 and gear 2 is established The fatigue reliability model is used to calculate the fatigue reliability and reliability sensitivity.The Monte Carlo simulation results are used to verify.(3)according to the maximum meshing force of gear 1 and gear 2 and related literature,the friction heat flux and convective heat transfer coefficient of gear 1 and gear 2 at the input end of shearer are calculated,and the steady temperature field of gear at the input end of shearer is obtained by loading each side of gear with ANSYS,and the maximum temperature of gear at the input end of shearer is obtained.(4)the input gear of the shearer is sampled in Latin,and the data of Latin sampling is substituted into the model of the transmission system of the rocker arm of the shearer,and the corresponding maximum meshing force is obtained.Then,the friction heat flow and convection coefficient of the corresponding sample points are calculated by using the data of the meshing force,and the corresponding maximum temperature is obtained by successively loading with ANSYS,and the response surface is used to simulate According to the function relationship between the maximum temperature and the random parameter variables,the temperature reliability models of gear 1 and gear 2 are established,and the temperature reliability and reliability sensitivity are calculated by perturbation method.And the Monte Carlo simulation results are used to verify.