Lightweight Design Of Two-stage Planetary Structure Of Vertical Mill Reducer

At present,the current domestic cement industry develops to large-scale,environmental protection and energy conservation,and the market for the large vertical mill gradually expands.Large vertical mill reducer is the key driving device of the large vertical mill system.So the design of large vertical mill reducer are very important.The research of the large vertical mill reducer focus on meeting the operation performance of the reducer and minimizing its size and weight to lower costs.In this paper,the gear parameters of two-stage planetary transmission system of the dual planetary vertical mill reducer is optimized,and the structure of planet carrier and case as key components of the reducer are also optimized to have lightweight design of the reducer.Concrete research work is as follows:In terms of gear parameters optimization,the objective of the two stage planetary transmission system has the advantages of small size and good stability is considered.According to the structural characteristics and parameter relations of the two-stage planetary transmission system,some of key parameters are determined as design variables and the strength and the size boundary relation between the parameters as constraint condition,to establish a multi-objective optimization mathematical model.Then the fgoalattain function in MATLAB optimization toolbox is used to calculate the model solution,and the optimized gear parameters obtained are compared with the original parameters to determine the effect of gear parameters optimization.In terms of structural optimization of key components,SolidWorks is used to build the model of planet carrier and case firstly,and the model is imported into the analysis program ANSYS Workbench through the interface of ANSYS Workbench.Then the static analysis and eigenvalue buckling analysis are carried out for the planetary carrier and case by ANSYS Workbench,so as to acquire relevant stress and displacement diagram,buckling deformation displacement diagram and buckling load coefficient.According to the stress and deformation condition,the parameters such as the thickness of sidewall of planet carrier and the wall thickness of case are selected as parameter variables of the optimized design to establish the parametric finite element model of the planet carrier and case.The optimal analysis of the model results in a 10.5% reduction in the total weight of planet carrier and case.Finally,the optimization results are analyzed and checked to prove that they meet the performance requirements and that the optimization results are valid.In this paper,the gear parameters optimization of the transmission system and the structure optimization of planet carrier and case are achieved.So the purpose of lightweight reducer is achieved,which provides a reliable basis for the design and improvement of vertical mill reducer.