中子应力谱仪样品承重台回转支承载荷分析

针对中子应力谱仪样品承重台(简称“中子谱仪样品台”)旋转运动机构用三排圆柱滚子回转支承的特殊结构和受载情况，基于Hertz理论，实现了力学分析模型的建立和求解，在此基础上通过有限元法分析了中子谱仪样品台极限工况下滚子与滚道之间的接触特性，然后分析了轴向载荷、径向载荷、滚子数量对回转支承刚度的影响。研究结果表明：在中子谱仪样品台极限工况下，上排滚子与滚道的接触区域等效应力最大，为76.98MPa，外圈滚道的最大等效应力为14.82MPa，内圈滚道最大等效应力为11.26MPa;刚度分别随轴向载荷、径向载荷和滚子数目的增大而增大，且均成非线性关系，当轴向载荷增至1200kN、径向载荷增至300kN时，轴向刚度和径向刚度增长趋势明显减慢，当上排与下排滚子数量增至170时，轴向刚度的增大趋势明显加快。研究结果为中子谱仪样品台旋转运动机构的设计提供了参考。

Load Analysis of Neutron Spectrometer Sample Table Rotary Bearing

According to the three-row roller slewing bearing structure characteristics and load characteristics, the establishment and solution of the mechanics analysis model were achieved by using Hertz contact theory. The contact characteristics of slewing bearing between the roller and the raceway were analyzed by using FEM on the basis of mechanics analysis model, then the effects of axial loads, radial loads and roller numbers on the slewing bearing stiffnesses were analyzed. The results show that under the extreme conditions the equivalent stress of contact area of upside roller and raceway is largest, which is as 76.98MPa, the maximum equivalent stress of outer ring raceway is as 14.82MPa, the maximum equivalent stress of inner ring raceway is as 11.26 MPa. Stiffnesses increase with increasing of axial loads, radial loads and roller numbers respectively and the relationship among them are nonlinear, when the axial loads increase to 1200kN and radial loads increase to 300kN, axial stiffness and radial stiffness increasing rates slow down significantly, when the roller numbers increase to 170, the axial stiffness increasing rates speed up significantly. The study may provide useful references for neutron spectrometer sample table rotating motion mechanism structure design.