Research On The Stress Variation Law In The Meshing Process Of The Rack Rail Wheel And Pin Rail

The non chain drive as one of the most widely adopted traction mode in the shearer,the rack rail wheel is used as the actuator of the walking mechanism to transfer power with the pin rail on the scraper conveyor by meshing.Due to the abominable working conditions,the pitting corrosion,severe wear on the tooth surface of the rack rail wheel and even tooth breaking etc.appear frequently,which seriously influence the work efficiency.In this paper,the static and transient dynamic analysis of them at different contact positions are analyzed after establishing the finite element model of the rack rail wheel and the pin rail,and it studies the influence of the rack rail wheel and the pin rail's elastic modulus and Poisson's ratio on the contact stress in meshing process,provides a reference for the rack rail wheel and the pin rail when designing materials to improve safe operating life of the rack rail wheel and the pin rail in a certain extent.On the basis of summarizing the research status of the meshing process of the rack rail wheel and the pin rail at home and abroad,First of all,this paper analyzes the types,performance requirements,common materials and so on commonly used of the rack rail and the pin rail in the coal industry,and the stress analysis of the gear wheel is carried out,then the common solutions to the problem of the elastomers contact is studied,and The theoretical calculates of the maximum contact stress produced by the contact of the 15-degree oblique line of the rack rail wheel and pin rail's tooth at the theoretical level.In this paper,the 3D modeling software Catia is used to model the parametric models of the MG400 QW type shearer's rack rail wheel and pin rail,and then into the FEA software ANSYS Workbench in different contact position(the contact between the rack rail wheel and the pin rail's addendum circle,the contact position between the rack rail wheel and the pin rail's transition position of arc and oblique line,the contact between the rack rail wheel and the pin rail's line)static contact analysis,so the influence of the variation of these properties on the equivalent stress in the meshing process is studied by changing the elastic modulus and Poisson's ratio of the rack rail wheel and pin rail.Analysis results show that rack rail wheel and pin rail of elastic modulus,Poisson's ratio increases will increase the maximum equivalent in different positions of the contact stress,maximum contact stress and root stress,and the effect of elastic modulus on the analysis result is significantly greater than the Poisson's ratio.According to the results of static contact analysis,Transient dynamics analysis of two groups of material property matching rack rail wheel and pin rail model are set up(group ?:High elastic modulus,Poisson ratio rack tail wheel and pin rail engagement;group ?:Low elastic modulus,Poisson ratio rack rail wheel and pin rail engagement)is completed,and according to the actual working condition of the shearer,four different kinds of loads such as uniform speed,uniform deceleration,uniform acceleration and impact load are set up,then the results of the two groups are compared and that under the four conditions,the maximum equivalent stress,the maximum contact stress and the stress at the tooth root can be reduced to a great extent.The research results can provide some guiding significance for the design and selection of the rack rail wheel and the pin rail,and then improve the service life and reduce the production cost?...