【作者】 孙运会；

【导师】 马希直；

【作者基本信息】 南京航空航天大学 ， 机械设计及理论， 2011， 硕士

【摘要】 球磨机是一种固体物料制粉设备,其重载低速的工况条件对轴承性能提出很高的要求。液体静压轴承具有工作速度范围宽、承载力大、抗冲击性能良好、寿命长等优点,因此常被用作球磨机的支承部件。滑履轴承是一种由若干块轴瓦组成的可倾瓦液体静压轴承,其油腔采用主油腔和平衡油腔相结合的形式,可通过调节两种油腔间润滑油的流量来调整瓦块姿态,从而满足承载要求。论文介绍了滑履轴承的结构,以流体润滑理论为基础建立了滑履轴承的求解理论模型。采用有限差分法和松弛迭代法求解简化的Reynolds方程,得到了滑履轴承的油膜承载特性,并利用多重网格法加速解的收敛。采用商业有限元软件ANSYS对球磨机进行了弹性变形分析,并将弹性变形计算与油膜分析进行了耦合。结果表明:考虑弹性变形后的最小膜厚值小于未考虑变形时的值,且油膜厚度和压力的分布也发生了变化。为分析轴承相关结构参数对轴承性能的影响,对轴承的结构参数进行了简单的优化比较,影响参数包括节流器结构参数、油腔形状和油腔面积比。得到了结构参数与油腔压力、润滑油温升等轴承性能之间的关系,为滑履轴承的设计提供参考。为验证理论计算的合理性,实验测试了三种不同油腔面积比的轴瓦的油膜压力、油膜厚度及润滑油流量等。将实验测试值与油膜计算结果做了比较,验证了油膜理论计算的合理性,并分析了实验中轴瓦四个平衡油腔油膜压力不同的原因。更多还原

【Abstract】 The ball mill is one kind of grinding machine which can refine solid minerals. Its work condition of low speed and heavy load puts forward the requirement to the bearing performance. The liquid hydrostatic bearing has the advantages of a wide range of working speed, high load capability, good impact resistance and long life span. Therefore the liquid hydrostatic bearing is often used as the supporting equipment of ball mil. The hydrostatic shoe bearing is one type of hydrostatic Htilting pad bearingH, which is composed of several bearing pads. Its central oil pocket is surrounded by several corner oil pockets. In order to satisfy the carrying capacity, the position of pad can be adjusted by coordinating the flow of lubricating oil between central oil pocket and corner oil pocket.The paper begins with an introduction of the hydrostatic shoe bearing structure, and after the theoretical model of the hydrostatic shoe bearing is established according to the theory of fluid lubrication. The Reynolds equation is solved simply by using finite difference method and relaxation iteration method, and the solution convergence speed is accelerated by using multi-grid method. Then the load-carrying characteristics of the hydrostatic shoe bearing are obtained. The elastic deformation of ball mill is analyzed by using commercial finite element software ANSYS. The hydrostatic shoe bearing is designed by coupling calculation of oil film and elastic deformation. The results show that the minimum oil film thickness considering the elastic deformation is less than that of ignoring the elastic deformation, and the distribution of oil film thickness and pressure also changes.In order to discuss the influence of the bearing related structure parameters on the bearing performance, the bearing related structure parameters, including restrictor structure parameter, oil pocket geometric shape and oil pocket area ratios, are compared and optimized simply. The relationship between structure parameters and oil film pressure or the temperature rising of lubricating oil is calculated, so the results can give reference for the design of the hydrostatic shoe bearing.The feasibility of the theoretical calculation model is proved by the bearing pad experiment of three different oil pocket area ratios. The oil film bearing pressure, the oil film thickness and the lube oil amount are tested in the experiment. After that, compare the experiment value to the value of oil film theoretical calculation. Finally, the reason of the four corner oil pockets film pressure difference is explained.更多还原