本文選題：大型球磨機(jī) + 襯板　； 參考：《吉林大學(xué)》2015年碩士論文

【摘要】：本文在國家高科技研究發(fā)展計(jì)劃（863項(xiàng)目）“大型露天礦采礦技術(shù)與裝備”(NO.2012AA062002)的資助下，對(duì)大型球磨機(jī)襯板的磨損機(jī)理及性能進(jìn)行了研究。分析了球磨機(jī)的工作原理，提出了非平滑襯板的設(shè)計(jì)原則，研究了襯板的磨損機(jī)理，對(duì)梯形襯板結(jié)構(gòu)進(jìn)行了設(shè)計(jì)與優(yōu)化，并利用離散元與有限元耦合的方法對(duì)襯板的性能進(jìn)行了仿真與分析。 在查閱國內(nèi)外相關(guān)文獻(xiàn)的基礎(chǔ)上，綜述了離散元法在球磨機(jī)中的應(yīng)用以及球磨機(jī)襯板的國內(nèi)外研究現(xiàn)狀，歸納了球磨機(jī)的介質(zhì)運(yùn)動(dòng)狀態(tài)與規(guī)律，分析了球磨機(jī)主要工作參數(shù)以及有用功率、起動(dòng)力矩等性能參數(shù)的計(jì)算方法，研究了礦石顆粒的破碎機(jī)理，對(duì)球磨機(jī)的工作原理進(jìn)行了系統(tǒng)地討論與分析。 論文介紹了襯板的常見結(jié)構(gòu)與材質(zhì)，分析了襯板的主要失效形式以及影響襯板失效的主要因素，并在此基礎(chǔ)上提出了非平滑襯板的設(shè)計(jì)原則。由于梯形襯板的提升能力強(qiáng)、磨礦性能優(yōu)良，以沖擊力大、無效能耗低為原則，提出了梯形襯板結(jié)構(gòu)的設(shè)計(jì)方法�；谝r板的磨損機(jī)理，針對(duì)襯板的粘著磨損、磨料磨損、沖蝕磨損三種類型，，分別討論了其磨損的數(shù)學(xué)計(jì)算模型，并根據(jù)襯板的磨損周期及襯板磨損對(duì)球磨機(jī)生產(chǎn)效率的影響，對(duì)梯形襯板的結(jié)構(gòu)進(jìn)行了優(yōu)化。研究表明，優(yōu)化后的襯板不僅能夠提高球磨機(jī)的生產(chǎn)效率，而且還能提高襯板材料的利用率，延長(zhǎng)襯板的使用壽命。 利用離散元軟件EDEM，建立了球磨機(jī)襯板磨削物料的仿真模型，對(duì)介質(zhì)、礦石與襯板之間的相互作用進(jìn)行了分析與研究。提取了仿真過程中起動(dòng)力矩與有用功率的變化情況，與理論計(jì)算結(jié)果吻合，驗(yàn)證了仿真結(jié)果的正確性；研究了襯板的沖擊力和碰撞時(shí)耗散能量的分布，通過分析襯板的磨損云圖，總結(jié)了球磨機(jī)內(nèi)襯板的磨損規(guī)律；在此基礎(chǔ)上，對(duì)襯板進(jìn)行了DEM-FEM耦合分析，得到了襯板應(yīng)力的大小及分布，耦合結(jié)果與離散元仿真結(jié)果一致，驗(yàn)證了襯板磨損規(guī)律的正確性。 本文通過對(duì)大型球磨機(jī)襯板進(jìn)行離散元與有限元耦合仿真，得到了襯板的應(yīng)力分布以及磨損規(guī)律，不僅為襯板的結(jié)構(gòu)設(shè)計(jì)與性能研究提供了參考，而且對(duì)提高球磨機(jī)的生產(chǎn)效率和經(jīng)濟(jì)性能具有重要意義。
[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.
【學(xué)位授予單位】：吉林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD453

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