【摘要】：立式攪拌球磨機(jī)是一種重要的超細(xì)粉磨設(shè)備,廣泛的應(yīng)用于各個領(lǐng)域。本文論述了立式攪拌球磨機(jī)的歷史及國內(nèi)外的發(fā)展現(xiàn)狀、目前的理論研究以及工作原理和研究方向,詳細(xì)介紹了離散元法的基礎(chǔ)理論和離散元法在球磨機(jī)上的應(yīng)用,對顆粒離散元軟件EDEM進(jìn)行了簡單的介紹。對立式攪拌機(jī)球磨機(jī)內(nèi)的礦料運(yùn)動情況進(jìn)行了分析計算,并且分析了礦料的粉碎機(jī)理及粉碎過程中應(yīng)力應(yīng)變的關(guān)系和能耗規(guī)律。而且還對立式攪拌球磨機(jī)的筒體大小、螺旋升角、攪拌器的轉(zhuǎn)速、介質(zhì)球的尺寸、介質(zhì)球的配比進(jìn)行了分析計算,為后面的仿真和實(shí)驗(yàn)做好理論基礎(chǔ)。本文以立式攪拌球磨機(jī)為研究對象,建立簡易的三維模型,使用顆粒離散元軟件EDEM對立式攪拌球磨機(jī)的攪拌器轉(zhuǎn)速、介質(zhì)球配比、螺旋攪拌器的螺旋角進(jìn)行仿真,得出運(yùn)動過程中介質(zhì)球和礦料的平均法向力、平均切向力、平均動能以及攪拌器的轉(zhuǎn)矩,并結(jié)合巖石的破碎理論,計算出礦料所需要的極限抗壓力和極限抗剪力,以及計算出攪拌器與介質(zhì)球和物料的能量轉(zhuǎn)換率進(jìn)行分析對比,得出最佳的轉(zhuǎn)速、介質(zhì)球配比以及螺旋角。并且得到介質(zhì)球和物料在運(yùn)轉(zhuǎn)過程的運(yùn)動狀態(tài)。通過對鉑鈀礦的分組實(shí)驗(yàn)得到-200目的礦粒產(chǎn)量,與EDEM軟件仿真的結(jié)果進(jìn)行對比得出,實(shí)驗(yàn)結(jié)果與實(shí)際結(jié)果基本保持一致,從而為立式攪拌球磨機(jī)的結(jié)構(gòu)參數(shù)優(yōu)化和工作參數(shù)優(yōu)化提供參考依據(jù)。
[Abstract]:Vertical mixing ball mill is an important ultrafine grinding equipment, widely used in various fields. In this paper, the history of vertical mixing ball mill and its development at home and abroad are discussed. The current theoretical research, working principle and research direction are discussed. The basic theory of discrete element method and the application of discrete element method in ball mill are introduced in detail. The particle discrete element software EDEM is briefly introduced. The movement of ore in the ball mill of opposite mixer is analyzed and calculated, and the mechanism of crushing, the relationship between stress and strain and the law of energy consumption during crushing are analyzed. In addition, the size of cylinder, spiral angle, rotating speed of agitator, the size of medium ball and the proportion of medium ball are analyzed and calculated, which provides a theoretical basis for the simulation and experiment. In this paper, a simple 3D model of vertical agitating ball mill is established, and the agitator speed, medium ball ratio and spiral angle of spiral agitator are simulated by using the discrete element software EDEM, which is used to simulate the rotating speed of agitator, the proportion of medium ball, and the helical angle of spiral agitator. The average normal force, the average tangential force, the average kinetic energy and the torque of the agitator during the moving process of the medium ball and the mineral mass are obtained. Combined with the rock breaking theory, the limit pressure resistance and the ultimate shear resistance of the mineral material are calculated. The energy conversion rate of the agitator is calculated and compared with that of the dielectric sphere and material, and the optimum rotational speed, the ratio of the medium ball and the spiral angle are obtained. And the movement state of the medium ball and material in the running process is obtained. Through the grouping experiment of platinum-palladium ore, the output of -200 target ore is obtained, and compared with the simulation results of EDEM software, the experimental results are basically consistent with the actual results. Thus, it provides a reference for the optimization of structural parameters and working parameters of the vertical mixing ball mill.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ051.9

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