發(fā)布時間：2018-02-20 01:15

  本文關鍵詞： 球磨機 轉(zhuǎn)速調(diào)控 填補 磨礦效率 DEM仿真分析 Matlab/Simulink仿真　出處：《江西理工大學》2015年碩士論文　論文類型：學位論文

【摘要】：球磨機是礦山選礦設備中廣泛使用的必不可少的機械,球磨機的磨礦效率和能源、材料消耗決定著整個選礦廠的生產(chǎn)能力和經(jīng)濟效益。實際生產(chǎn)中,球磨機筒體襯板及球介的消耗量占生產(chǎn)費用中較大的比例,因此對球磨機的深入研究是十分有必要和價值的。影響球磨機磨礦效率的因素有很多,如襯板材料、襯板型式、磨球的配比、筒體轉(zhuǎn)速、填充率、被磨礦粒等等。當前,選礦廠普遍使用轉(zhuǎn)速固定的球磨機,固定轉(zhuǎn)速下球磨機襯板的磨損會引起磨礦效率下降。本文以球磨機筒體轉(zhuǎn)速、不同磨損量的襯板為研究對象,在某選礦廠生產(chǎn)現(xiàn)場采集相關數(shù)據(jù)和查閱大量相關影響磨礦因素文獻的基礎上,開展以下方面的研究:(1)對單個球介的受力情況以及運動狀況、球介作圓周和拋落運動狀態(tài)的運動軌跡進行分析并推導球介的運動軌跡方程;研究球介的沖擊特性、沖擊位置和沖擊角度、沖擊能量及自轉(zhuǎn)速度等參數(shù)對軌跡的影響;建立計算襯板壽命的數(shù)學方程,分析襯板的結(jié)構(gòu)、襯板的受力情況和襯板表面的參數(shù)對襯板壽命的影響。(2)運用DEM軟件進行球磨機磨礦數(shù)值的仿真實驗研究。以襯板磨損量和球磨機筒體轉(zhuǎn)速為變量,設定三種仿真方案研究調(diào)節(jié)轉(zhuǎn)速填補不同磨損量襯板對磨礦效率的影響。保證除轉(zhuǎn)速以外其它因素不變的情況下,改變筒體轉(zhuǎn)速,對比分析其磨礦效率;保證球磨機筒體轉(zhuǎn)速固定不變的情況下,導入不同磨損量的襯板,對比分析其磨礦效率;不同磨損量的襯板結(jié)合相應的轉(zhuǎn)速,對比其磨礦效率。仿真結(jié)果證實了微調(diào)球磨機筒體轉(zhuǎn)速可有效解決固定轉(zhuǎn)速下球磨機襯板的磨損引起磨礦效率下降的問題。(3)研究球磨機筒體轉(zhuǎn)速調(diào)節(jié)的系統(tǒng)設計。球磨機轉(zhuǎn)速調(diào)節(jié)的實質(zhì)在于驅(qū)動電機轉(zhuǎn)速的調(diào)控。以Matlab軟件為平臺,永磁同步電機為對象,結(jié)合正弦波的三相永磁同步電動機的數(shù)學模型和轉(zhuǎn)子磁場定向矢量控制原理,建立永磁同步電機轉(zhuǎn)速在Simulink中的仿真控制模型,從而實現(xiàn)筒體轉(zhuǎn)速在Matlab/Simulink軟件中的模擬控制仿真,理論上驗證轉(zhuǎn)速調(diào)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.

【學位授予單位】：江西理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TD453

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