回转窑托轮与轮带的接触应力及轮带的性能分析

Analysis to contact stress between kiln tyre and support rollers and tyre behaviors

用接触力学方法推导了托轮与轮带接触应力的计算公式,利用ANSYS的二次开发功能,开发了托轮与轮带的有限元建模程序,建立了回转窑托轮与轮带的有限元分析模型。应用接触力学和有限元方法对2号窑的托轮轮带的接触应力进行了计算,表明这两种方法都有较高的计算精度。有限元法计算结果表明:在滚动接触过程中,轮带应力呈复杂交变状态,在与托轮的接触区内,出现了明显的应力集中,这使接触面表层易出现楔状掉块、开裂等接触疲劳破坏;在轮带回转过程中,每一点的变形均呈现凹凸交变的复杂状态,从而迫使简体的变形凹凸交变,严重时导致窑衬松动脱落。

Calculation formula for contact stress between tyre and support rollers was developed with method of contact mechanics. Using secondary development function from ANSYS, program for finite element modeling of tyre and support rollers was developed and finite element analysis model for tyre and support rollers was established. Contact stress between kiln tyre and support rollers for No.2 kiln was calculated with method of contact mechanics and method of finite element, and the results revealed that both methods have good calculation accuracy. Calculation result from method of finite element shows that during rolling contact, the tyre stress has presented complex alternative status, and obvious stress concentration is occurred within contact area with support roller, which will result in contact fatigue failure like surface wedge-shaped spalling or cracking. During tyre rotation, deformation in every point behaved complex concave-convex alternative status, which will force kiln shell deformation in concave-convex alternative status and result in kiln liner loose or failure at severe conditions.