大型球磨机静压轴承承载性能研究
发布时间：2018-08-27 20:37
【摘要】：球磨机作为一种物料磨粉装备，因其具备破碎比大、稳定性好、适应性强等优点被广泛应用到矿山、冶金、化工等领域。由于生产力的需要以及技术发展的推动，球磨机大型化逐渐成为一种发展趋势。静压轴承是大型球磨机的核心部件，研究静压轴承的承载能力、稳定性及可靠性对保障球磨机安全可靠的运行具有重要意义。 本文基于国家自然科学基金项目（51265020）对大型球磨机静压轴承承载油膜与调心轴衬进行了研究，分析了润滑油粘温特性、中空轴偏转以及轴衬曲面曲率等多种因素对球磨机静压轴承承载性能的影响。主要研究工作与结论如下： （1）基于平行平板缝隙流体模型建立了静压轴承油膜简化模型，获得了油膜承载能力与液压油压力、流量、油膜厚度之间的关系。然后建立了静压轴承油膜CFD仿真模型，并将仿真结果与简化模型计算结果进行了对比。对比结果：常粘度情况下相同油膜厚度CFD仿真计算得到的液压油流量约为简化模型流量的1.09倍；变粘度情况下相同油膜厚度仿真计算得到的液压油流量约为简化模型流量的1.10倍。 （2）通过CFD仿真获得了静压轴承油膜压力场、温度场以及流量、速度等油膜特性，分析了液压油粘温效应、油膜厚度、中空轴转速以及中空轴偏转对油膜压力场、温度场以及流量、速度的影响，得到了相关参数与油膜压力场、温度场以及流量、速度的关系。分析结果显示中空轴偏转对静压轴承油膜压力场与温度场分布影响较为明显，随着偏转角度的增大油膜压力场产生不均匀分布，对轴瓦表面产生偏转力矩。 （3）建立了轴承轴衬-轴承座接触简化模型，通过计算获得轴衬-轴承座接触面接触压力。然后建立了轴衬-轴承座有限元仿真模型，软件仿真求解接触面接触压力并将所得最大接触压力与简化模型计算结果进行比较，验证了计算结果的准确性。 （4）基于有限元仿真结果研究了不同轴向曲面曲率半径与径向曲面曲率半径对轴衬与轴承座接触性能的影响，并分析了曲面曲率与调心位移量、调心力矩之间的关系。然后建立了带有轴衬偏转的轴衬-轴承座有限元仿真模型，分析了轴衬偏转对接触压力、接触面积的影响。计算结果表明：轴向曲率半径对轴向接触压力与接触宽度影响显著，轴向曲率的增大可以明显降低最大接触压力，但增加了调心位移量；而径向曲率半径对径向接触压力与接触长度影响显著，可以明显降低最大接触压力，但调心力矩也会因此受到影响。
[Abstract]:As a kind of material grinding equipment, ball mill has been widely used in mining, metallurgy, chemical industry and other fields because of its advantages of high crushing ratio, good stability and strong adaptability. Due to the need of productivity and the promotion of technology development, the large-scale ball mill has gradually become a trend of development. Static bearing is the core part of large ball mill. It is of great significance to study the bearing capacity, stability and reliability of hydrostatic bearing to ensure the safe and reliable operation of ball mill. In this paper, based on the project of National Natural Science Foundation (51265020), the oil film and centering liner of the hydrostatic bearing of large ball mill are studied, and the viscosity and temperature characteristics of lubricating oil are analyzed. The influence of hollow shaft deflection and surface curvature on the bearing capacity of hydrostatic bearing of ball mill. The main research work and conclusions are as follows: (1) based on the parallel plate slit fluid model, the simplified oil film model of hydrostatic bearing is established, and the relationship between oil film bearing capacity and hydraulic pressure, flow rate and oil film thickness is obtained. Then the CFD simulation model of hydrostatic bearing oil film is established, and the simulation results are compared with those of the simplified model. The results show that the hydraulic oil flow rate calculated by CFD simulation under the condition of constant viscosity is about 1.09 times that of the simplified model. Under the condition of variable viscosity, the hydraulic oil flow rate calculated by the same oil film thickness is about 1.10 times that of the simplified model. (2) the oil film characteristics such as pressure field, temperature field, flow rate and velocity of hydrostatic bearing are obtained by CFD simulation. The effects of oil film thickness, rotation speed of hollow axis and deflection of hollow axis on oil film pressure field, temperature field, flow rate and velocity are analyzed. The relationship between the relative parameters and oil film pressure field, temperature field, flow rate and velocity is obtained. The results show that the influence of hollow shaft deflection on the distribution of oil film pressure field and temperature field of hydrostatic bearing is obvious, and with the increase of deflection angle, the oil film pressure field is distributed unevenly. The deflection moment is produced on the bearing surface. (3) A simplified model of bearing bushing-bearing contact is established and the contact pressure of the bearing-bearing contact surface is obtained by calculation. Then the finite element simulation model of the bushing and bearing seat is established. The contact pressure of the contact surface is solved by software simulation and the calculated results of the maximum contact pressure are compared with those of the simplified model. The accuracy of the calculation results is verified. (4) based on the finite element simulation results, the effects of different radius of curvature of axial and radial surface on the contact performance of the shaft liner and the bearing are studied. The relationship between curvature, displacement and torque is analyzed. Then the finite element simulation model of the shaft liner bearing seat with the deflection of the shaft liner is established, and the influence of the deflection of the shaft liner on the contact pressure and contact area is analyzed. The calculated results show that the axial radius of curvature has a significant effect on the axial contact pressure and the contact width. The increase of axial curvature can obviously reduce the maximum contact pressure, but increase the centering displacement. The radial radius of curvature has a significant effect on the radial contact pressure and contact length, which can obviously reduce the maximum contact pressure, but the centering moment will also be affected.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ051.91
本文编号：2208385
[Abstract]:As a kind of material grinding equipment, ball mill has been widely used in mining, metallurgy, chemical industry and other fields because of its advantages of high crushing ratio, good stability and strong adaptability. Due to the need of productivity and the promotion of technology development, the large-scale ball mill has gradually become a trend of development. Static bearing is the core part of large ball mill. It is of great significance to study the bearing capacity, stability and reliability of hydrostatic bearing to ensure the safe and reliable operation of ball mill. In this paper, based on the project of National Natural Science Foundation (51265020), the oil film and centering liner of the hydrostatic bearing of large ball mill are studied, and the viscosity and temperature characteristics of lubricating oil are analyzed. The influence of hollow shaft deflection and surface curvature on the bearing capacity of hydrostatic bearing of ball mill. The main research work and conclusions are as follows: (1) based on the parallel plate slit fluid model, the simplified oil film model of hydrostatic bearing is established, and the relationship between oil film bearing capacity and hydraulic pressure, flow rate and oil film thickness is obtained. Then the CFD simulation model of hydrostatic bearing oil film is established, and the simulation results are compared with those of the simplified model. The results show that the hydraulic oil flow rate calculated by CFD simulation under the condition of constant viscosity is about 1.09 times that of the simplified model. Under the condition of variable viscosity, the hydraulic oil flow rate calculated by the same oil film thickness is about 1.10 times that of the simplified model. (2) the oil film characteristics such as pressure field, temperature field, flow rate and velocity of hydrostatic bearing are obtained by CFD simulation. The effects of oil film thickness, rotation speed of hollow axis and deflection of hollow axis on oil film pressure field, temperature field, flow rate and velocity are analyzed. The relationship between the relative parameters and oil film pressure field, temperature field, flow rate and velocity is obtained. The results show that the influence of hollow shaft deflection on the distribution of oil film pressure field and temperature field of hydrostatic bearing is obvious, and with the increase of deflection angle, the oil film pressure field is distributed unevenly. The deflection moment is produced on the bearing surface. (3) A simplified model of bearing bushing-bearing contact is established and the contact pressure of the bearing-bearing contact surface is obtained by calculation. Then the finite element simulation model of the bushing and bearing seat is established. The contact pressure of the contact surface is solved by software simulation and the calculated results of the maximum contact pressure are compared with those of the simplified model. The accuracy of the calculation results is verified. (4) based on the finite element simulation results, the effects of different radius of curvature of axial and radial surface on the contact performance of the shaft liner and the bearing are studied. The relationship between curvature, displacement and torque is analyzed. Then the finite element simulation model of the shaft liner bearing seat with the deflection of the shaft liner is established, and the influence of the deflection of the shaft liner on the contact pressure and contact area is analyzed. The calculated results show that the axial radius of curvature has a significant effect on the axial contact pressure and the contact width. The increase of axial curvature can obviously reduce the maximum contact pressure, but increase the centering displacement. The radial radius of curvature has a significant effect on the radial contact pressure and contact length, which can obviously reduce the maximum contact pressure, but the centering moment will also be affected.
【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ051.91
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