Stress Analysis Of Railway Internal Locking Device And Removable Heart-rail Frog Points

In this paper, the computational contact model of the three-dimensional the finiteelement for the Xi’an Siemens signals Company Limited on the S600inner lock switchmachines and60kg/m-18Movable heart-rail as frog points, through the use ofcommercial software Abaqus calculate，and then analysis heart-rail deformation as wellas the stress change of inner locked axis. The calculation model used in the thesisinclude Heart-rail, Wing rail, Locking shaft, Locking block, Action rod, Chassis andalmost all of the related components within kinds of connecting member, and establish amodel made by wheels and sleepers, it is used to simulate real loads and constraints, italso be used to compare the real response of the entire system of the real situation.The computation load of the thesis are divided into vertical and horizontal forces,in order to truly reflect Heart-rail deformation, the load is especially loaded into theaxial center of the wheel, and constrain to degree of freedom of wheel. Whole process isanalyzed according to the quasi-static problems, without considering the acceleration ofstructure, only consider the position variation of loading point (located in the trainwheel), train per advancing some distance referred to as a node, and can be obtained aset of data. This article studies when the train passing Heart-rail, the Intrinsic link thatamong the Heart-rail deformation and locking shaft stress cyclical and train runningdistance. In addition, the article also analysis the local stress on locking shaft and actionrod, and improve its shape.By comparing the calculation results of the analysis can be found: when the trainmoving on the Heart-rail, If several wheels distance is not far away, before passingLocking point or heart-rail wing rail connection point, heart rail deformation and theforce on lock shaft mainly caused by the first wheel. Otherwise, it’s due to the combined effect of the front wheel and rear wheel. Locking shaft by force and Heart-raildeformation, changes quickly, the upper amplitude and the lower amplitude of thedifference is large, the complex change process, etc, and showed obvious cyclicalchanges. Various parts meet the strength criteria in accordance with existing load.Through analysis locking shaft, action rod local stress can be found: In the originaldesign scheme, locking shaft and action rod locking hole exist significant concentrationof stress, and the stress rendered a significant value difference cyclical changes. Theanalysis calculations in this paper show that: by adopting the cylindrical locking shaftprogram and the cylinder pin hole technology can effective reduce stress concentrationand avoid the fatigue damage of parts. This paper also put forward a cylinder pin holedesign calculation methods.