Study On Parametric Finite Element Analysis Of The Rotator Of Large-Scale Ball Mill

Ball Mill is a kind of grinding equipment which use steel ball as grinding media, it has simple structure, stable performance, high crushing ratio which is between 3 and 100.It can be used both for wet grinding and dry grinding of various mineral raw materials and can be automatic controlled easily. Therefore, ball mill is the most common grinding equipment in processing, building material, chemical, metallurgical and material industry, it occupies an important position in mineral crushing and superfine processing, which has aroused people's favor.In recent years, with the increasing size of mine, how to shorten the production processing configuration, enhance the processing ability to reduce capital investment and production costs in the exploitation of large-scale, low-level deposit, has been pursuing by many mines. This put forwards urgent demands for all mill developing in the trend of increasing specifications. The large-scale ball mill has become a hot topic at home and abroad, it is also the development direction of ball mill technique. Generally speaking, the ball mill which diameter is over four meters is called large-scale ball mill in the grinding industry. Experience has shown that the strength and stiffness of the rotator of large-scale ball mill have a significant affection on its working life and the movement accuracy of the various components of its gearing. Statistics show that the production accidents of china-made large-scale ball mill are caused mostly by its rotator failure. All these reflect the flaws of the traditional methods in large-scale ball mill design.Based on the above, to improve the mill's design quality, by consulting a large number of domestic and foreign literature and industry related websites, this paper conducted a comprehensive survey on the research actuality of the rotator firstly, the results indicates that the finite element method is a practical design method which can be able to overcome the shortfall of our traditional design methods which can only solve the problem of the separate component. It also summed up the design, manufacturing, using and maintaining actuality of large-scale ball mill in worldwide especially in the major developed countries. It gives some industry experience expectantly can provide some references to domestic ball mill industry.Secondly, it analyzes the motion conditions of the crushing mediums in the rotator of ball mill, gives a emphasis on the analysis of the kinematics theory of the crushing mediums in the working condition of thrown. By analyzing and calculating the working parameters of the ball mill, it gives the motion equations of the crushing mediums in the working condition of thrown. Based on this, the related problems of the working condition of thrown can be quantitatively calculated. It also gives the detailed calculation process of the force of the rotator in the working condition of thrown, this provides the scientific theoretic foundation for the finite element analysis of ball mill.Then, it introduces the basis and the general steps of the parametric finite element analysis of the rotator of the large-scale ball mill, it also gives the specific process of the parametric finite element analysis of the rotator of the large-scale ball mill which is based on the APDL, that is the procedure of the APDL program command stream. It elaborates on the methods of the geometric structure simplification, the gravity compensation, the grid precision processing and division, the constraints applying and the loads calculation and applying, and so on. The parametric finite element analysis software of the rotator of large-scale ball mill can be gotten by packaging the APDL program command stream using VB language.The meshed model of a certain series of rotators-structurally similar but different size-can be gotten by inputting different parameters into this software, furthermore the parametric applying of the constraints and loads, the solution and the post-processing can be automatically completed, therefore the results of the stress distribution and structure deformation of the rotator modeling by the given design plan can be gotten. Based on the above, for the same series of products, by simply changing the value of the parametric size, you can automatically receive their finite element analysis results quickly. This can eliminate a lot of repeated processes, enhance the efficiency of the analysis greatly, provide the basis for the rapid improvement of the given design plan, therefore it can shorten the design cycle, reduce design and testing costs, launch new qualified products and occupy the market quickly.Finally, the finite element analyses of the rotator of a particular series of large-scale ball mill were done by using this software, these work and the stress and deform results of the rotator validate the practicality and reliability of the software.