基于离散元与有限元耦合的大型球磨机衬板性能研究

发布时间：2018-07-09 18:41

本文选题：大型球磨机 + 衬板　；参考：《吉林大学》2015年硕士论文

【摘要】：本文在国家高科技研究发展计划（863项目）“大型露天矿采矿技术与装备”(NO.2012AA062002)的资助下，对大型球磨机衬板的磨损机理及性能进行了研究。分析了球磨机的工作原理，提出了非平滑衬板的设计原则，研究了衬板的磨损机理，对梯形衬板结构进行了设计与优化，并利用离散元与有限元耦合的方法对衬板的性能进行了仿真与分析。在查阅国内外相关文献的基础上，综述了离散元法在球磨机中的应用以及球磨机衬板的国内外研究现状，归纳了球磨机的介质运动状态与规律，分析了球磨机主要工作参数以及有用功率、起动力矩等性能参数的计算方法，研究了矿石颗粒的破碎机理，对球磨机的工作原理进行了系统地讨论与分析。论文介绍了衬板的常见结构与材质，分析了衬板的主要失效形式以及影响衬板失效的主要因素，并在此基础上提出了非平滑衬板的设计原则。由于梯形衬板的提升能力强、磨矿性能优良，以冲击力大、无效能耗低为原则，提出了梯形衬板结构的设计方法。基于衬板的磨损机理，针对衬板的粘着磨损、磨料磨损、冲蚀磨损三种类型，，分别讨论了其磨损的数学计算模型，并根据衬板的磨损周期及衬板磨损对球磨机生产效率的影响，对梯形衬板的结构进行了优化。研究表明，优化后的衬板不仅能够提高球磨机的生产效率，而且还能提高衬板材料的利用率，延长衬板的使用寿命。利用离散元软件EDEM，建立了球磨机衬板磨削物料的仿真模型，对介质、矿石与衬板之间的相互作用进行了分析与研究。提取了仿真过程中起动力矩与有用功率的变化情况，与理论计算结果吻合，验证了仿真结果的正确性；研究了衬板的冲击力和碰撞时耗散能量的分布，通过分析衬板的磨损云图，总结了球磨机内衬板的磨损规律；在此基础上，对衬板进行了DEM-FEM耦合分析，得到了衬板应力的大小及分布，耦合结果与离散元仿真结果一致，验证了衬板磨损规律的正确性。本文通过对大型球磨机衬板进行离散元与有限元耦合仿真，得到了衬板的应力分布以及磨损规律，不仅为衬板的结构设计与性能研究提供了参考，而且对提高球磨机的生产效率和经济性能具有重要意义。
[Abstract]:In this paper, the wear mechanism and performance of lining plate of large ball mill are studied with the aid of National High-Tech Research and Development Program (863 Project) "Large-scale Open-pit Mining Technology and equipment" (no. 2012AA062002). The working principle of ball mill is analyzed, the design principle of non-smooth liner is put forward, the wear mechanism of liner is studied, and the structure of trapezoidal liner is designed and optimized. The performance of the liner is simulated and analyzed by the coupling method of discrete element and finite element. The application of discrete element method in ball mill and the research status of ball mill liner at home and abroad are summarized on the basis of consulting relevant literature at home and abroad, and the media motion state and law of ball mill are summarized. The main working parameters, useful power, starting moment and other performance parameters of ball mill are analyzed. The mechanism of crushing ore particles is studied, and the working principle of ball mill is discussed and analyzed systematically. This paper introduces the common structure and material of the liner, analyzes the main failure forms of the liner and the main factors affecting the failure of the liner, and puts forward the design principles of the non-smooth liner. The design method of trapezoid liner structure is put forward because of its strong lifting ability, excellent grinding performance and high impact force and low invalid energy consumption. Based on the wear mechanism of the liner, the mathematical calculation models of the wear of the liner are discussed according to the adhesion wear, abrasive wear and erosion wear. According to the wear period of the liner and the influence of the liner wear on the production efficiency of the ball mill, the mathematical calculation models of the wear are discussed respectively. The structure of trapezoidal liner is optimized. The results show that the optimized liner can not only improve the production efficiency of the ball mill, but also improve the utilization ratio of the liner material and prolong the service life of the liner. Using the discrete element software EDEM, the simulation model of grinding material for ball mill liner is established, and the interaction between medium, ore and lining plate is analyzed and studied. The variation of starting torque and useful power in the simulation process is extracted, which agrees with the theoretical calculation results, and verifies the correctness of the simulation results, and studies the distribution of the impact force of the liner plate and the energy dissipation during the collision. By analyzing the wear cloud diagram of the liner, the wear law of the inner liner of the ball mill is summarized, and on this basis, the coupling analysis of the lining plate by DEM-FEM is carried out, and the magnitude and distribution of the stress of the liner are obtained. The coupling results are consistent with the results of the discrete element simulation. The correctness of the wear law of the liner is verified. In this paper, the stress distribution and wear law of the liner plate are obtained by the coupling simulation of discrete element and finite element for the liner of the large ball mill, which not only provides a reference for the structural design and performance study of the liner plate, but also provides a reference for the study of the structure design and performance of the liner plate. Moreover, it is of great significance to improve the production efficiency and economic performance of ball mill.
【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】：TD453

【参考文献】