Large Vertical Grinding Machine Finite Element Analysis Of Key Components

Vertical mill is widely used at home and abroad, it is a kind of efficient and large equipmentin grinding and drying, which has been widely used in grinding blast furnace slag or cementclinker and other industrial raw materials. Vertical mill is based on principle of material grindingto design. Compared with the traditional tube mill, vertical mill has the characters of highefficiency of grinding, low energy consumption, good adaptability to abrasive, strong dryingability and maintenance convenience, so in recent years it has been widely used in the cementindustry. But in China this equipment mainly depends on import, and the technology of largevertical mill is monopolized by a few overseas companies. Although in recent years the domesticexperts have researched on tumbling mill, but compared with foreign countries, it still has largegap.Based on the basic theory of the finite element and structural analysis, This paper choosesvertical mill of the pillar as the main study aim,carries out a series of studies.Firstly,it summarizesthe working principle of vertical mill, principle of choosing powder and structure characteristics,analyses and calculates on loading system of grinding machine in this paper. According to thedesign requirements, the key parts of geometric model are designed. Vertical pillar and rockerarm are analyzed by ANSYS. The geometric model is built, after meshing elements, addingrestrictions, applying some load and postprocessing, displacement deformation and stressdistribution of pillar and rocker arm is obtained, then the design of key components meets theintensity and rigidity requirement. Secondly,the modal analysis is carried out for vertical pillar,getting column the plot of eight bands modal, the natural frequency of the column and thecorresponding mode shapes provides a theoretical basis for design and improve dynamicproperties of pilar.Finally, by the Design Explorer optimization module, with the minimum of the quality of thecolumn as the optimization objective, on the conditions of meeting the strength, the structure ofthe column is optimally designed, and the effect is significant. The subject chooses thickness ofshell as input variable, and also the thickness of support plate and both sides of dead plate, theinput variables are marked as ds1, ds2, ds3, ds4, the maximum equivalent stress must be smallerpermissible stress, design variable should meet boundary constraints. After structure optimization,paper obains influence diagram、response surface figure and sensitive analysis chart. Paper findsthat ds1and ds4have greatly effect on goal, especially variable ds1, When the design variablesrespectively is ds127.003mm, ds222.503mm, ds3225.03mm, ds4225.03, the quality of pillarreduced by669kg,it accouts for2.51%and meet the requirements of strength. It achieves theexpected goal: the quality is reduced, save cost and the raw materials.