调节筒体转速补给磨损衬板对球磨机球介轨迹影响的研究

发布时间：2018-02-20 01:15

本文关键词： 球磨机转速调控填补磨矿效率 DEM仿真分析 Matlab/Simulink仿真　出处：《江西理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：球磨机是矿山选矿设备中广泛使用的必不可少的机械,球磨机的磨矿效率和能源、材料消耗决定着整个选矿厂的生产能力和经济效益。实际生产中,球磨机筒体衬板及球介的消耗量占生产费用中较大的比例,因此对球磨机的深入研究是十分有必要和价值的。影响球磨机磨矿效率的因素有很多,如衬板材料、衬板型式、磨球的配比、筒体转速、填充率、被磨矿粒等等。当前,选矿厂普遍使用转速固定的球磨机,固定转速下球磨机衬板的磨损会引起磨矿效率下降。本文以球磨机筒体转速、不同磨损量的衬板为研究对象,在某选矿厂生产现场采集相关数据和查阅大量相关影响磨矿因素文献的基础上,开展以下方面的研究:(1)对单个球介的受力情况以及运动状况、球介作圆周和抛落运动状态的运动轨迹进行分析并推导球介的运动轨迹方程;研究球介的冲击特性、冲击位置和冲击角度、冲击能量及自转速度等参数对轨迹的影响;建立计算衬板寿命的数学方程,分析衬板的结构、衬板的受力情况和衬板表面的参数对衬板寿命的影响。(2)运用DEM软件进行球磨机磨矿数值的仿真实验研究。以衬板磨损量和球磨机筒体转速为变量,设定三种仿真方案研究调节转速填补不同磨损量衬板对磨矿效率的影响。保证除转速以外其它因素不变的情况下,改变筒体转速,对比分析其磨矿效率;保证球磨机筒体转速固定不变的情况下,导入不同磨损量的衬板,对比分析其磨矿效率;不同磨损量的衬板结合相应的转速,对比其磨矿效率。仿真结果证实了微调球磨机筒体转速可有效解决固定转速下球磨机衬板的磨损引起磨矿效率下降的问题。(3)研究球磨机筒体转速调节的系统设计。球磨机转速调节的实质在于驱动电机转速的调控。以Matlab软件为平台,永磁同步电机为对象,结合正弦波的三相永磁同步电动机的数学模型和转子磁场定向矢量控制原理,建立永磁同步电机转速在Simulink中的仿真控制模型,从而实现筒体转速在Matlab/Simulink软件中的模拟控制仿真,理论上验证转速调控的可行性。
[Abstract]:The ball mill is widely used in mining mineral processing equipment in essential machinery, grinding efficiency and energy consumption of the ball mill, the material determines the production ability of the concentrator and the economic efficiency. In actual production, the consumption of ball mill tube body lining board and dielectric ball accounted for a larger proportion of production costs, so the research of ball mill it is very necessary and valuable. There are many factors that affect the ball mill grinding efficiency, such as liner material, liner plate type, grinding ball ratio, cylinder speed, filling rate, by grinding grain and so on. At present, ore dressing plant commonly used ball mill speed fixed, fixed speed ball mill lining wear the plate caused by the grinding efficiency decreased. Based on the ball mill lining plate cylinder speed, different amount of wear as the research object, in the field of production of a concentrator to collect data and access to a large number of related factors affecting grinding literature base On the basis, to carry out the following research: (1) for a single ball mediated force and movement of the ball, and throw the circular dielectric trajectory falling motion state is analyzed and derived the trajectory equation of ball impact behavior of spherical dielectric; dielectric, impact position and impact angle, impact energy and the rotation speed on the trajectory; establish a mathematical equation for calculating the lining life, analysis of lining structure, lining plate impact force and lining surface parameters of the lining life. (2) the simulation experiment of ball mill grinding by using DEM software. The numerical liner wear the amount and speed of mill cylinder as the variable, set three kinds of simulation methods of adjusting speed fill different wear effect of liner on grinding efficiency. In addition to ensure speed than other factors unchanged, change the cylinder speed, comparative analysis of the grinding efficiency; guarantee The ball mill cylinder speed is fixed, the introduction of various wear lining plate volume, comparative analysis of the grinding efficiency; liner wear is different with the corresponding speed, comparing the grinding efficiency. Simulation results show that the fine ball mill cylinder speed can effectively solve the wear fixed speed ball mill lining plate caused by the grinding efficiency is lowered. (3) the system design of ball mill cylinder speed regulation. The speed regulation is the essence of the ball mill drive motor speed regulation. Based on Matlab software platform, the permanent magnet synchronous motor as the research object, combined with the mathematical model of three-phase sine wave permanent magnet synchronous motor and rotor flux oriented vector control principle and the establishment of permanent magnet synchronous motor speed control in the Simulink simulation model, so as to realize the control simulation in the Matlab/Simulink software in the cylinder speed, verify speed control. Feasibility.

【学位授予单位】：江西理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD453

【参考文献】