| Vertical mill is a broad useful equipment in grinding and drying, which is widely used in grinding cement or cement clinker and other building ceramics and other chemical industrial raw materials.In the working principle of vertical mill, grinding mechanism, mechanical structure of the system, process for its unique properties of the advantages of much greater importance attached to the cement industry at home and abroad. With the birth of the decomposition technique outside kiln, more and more vertical mills are used to grind cement raw material and clinker in the cement industry. Compared with the traditional ball mill, vertical mill has some advantages: high efficiency of grinding, low electricity consumption, strong drying capacity, convenient to adjust product fineness, simple technical process, small covering area, low noise, low metal consumption, convenient maintenance and repairing, and so on.Working principle, structure composition and common combination types of the vertical mill are analyzed in the paper. The major dimensions of components, which have impact on vertical mill technical parameters, are also analyzed in the paper. According to the design requirements of vertical mill, vertical mill parameters and key components of vertical mill are designed. PRO / E is taken as a platform to satisfy design requirements. At the same time, in order to facilitate the actual production work, three-dimensional prototype parts and assemblies drawings could be translated into two-dimensional engineering drawings directly.To make use of two finite element software: Hypermesh and ANSYS, key components of the vertical mill: grinding pressure device and grinding table device, are analyzed in finite element. First, operating conditions of vertical mill and key components structure of it are simplified, which is to meet the static requirements and the requirements of finite elements method. Then, geometric model of grinding pressure device is established, and the model is meshed into elements. Smaller rotational state of rockers and central axis is simulated by contact technology, and relative displacement movement between roller and linear is simulated by contact elements. The boundary conditions have been dealt with reasonably. After that, displacement deformation and stress distribution of top rocker and down rocker is obtained. At last, geometric model of grinding table device is established, and better elements, hexahedron elements are meshed. The grinding pressure and friction between linear and roller are simulated by vertical force and shear force, and displacement deformation and stress distribution of grinding table is obtained. Through the figures of displacement deformation and stress distribution of key components: top rocker, down rocker and grinding table, the reasonableness and the safety of key components design of vertical mill is validated, and design of key components meets the requirements.Based on the FEA results, to make use of mathematical optimization method, shape optimization is introduced into grinding table device in OptiStruct, an optimization module in the HyperWorks. Based on the model designed previously, optimization regions of grinding table are determined, shape disturbance variables are established. Manufacturing constraints and stiffness constraints are set up, and optimization objective is defined in the optimization model. After optimization calculation, a more reasonable model is obtained, which reduces weight of grinding table, and saves the cost at the same time. The introduction of shape optimization techniques, makes the structural design of a more scientific, to guide the engineering design. |
