本文選題：滾筒采煤機 + 裝煤效率　； 參考：《太原理工大學》2017年碩士論文

【摘要】：滾筒式采煤機是以螺旋滾筒作為工作機構的采煤裝備,除了完成截煤之外,其另一個主要功能是把截落的煤炭裝入采煤工作面的刮板輸送機。數(shù)十年來,滾筒式采煤機螺旋滾筒的裝煤效率一直是業(yè)內(nèi)關注的重點,而薄煤層滾筒采煤機的裝煤效率低的問題則更加突出。本文結合理論分析,采用離散元軟件仿真的方法,對影響采煤機滾筒裝煤效率的主要結構參數(shù)、運動參數(shù)、煤體性質參數(shù)、滾筒結構形式等因素進行了研究。基于采煤機滾筒裝煤機理,對葉片上某一煤顆粒進行了力學分析、運動學分析,推導出計算裝煤效率的理論模型,由此模型分析得出影響滾筒裝煤效率的主要因素包括滾筒直徑、葉片直徑、筒轂直徑、葉片厚度、葉片頭數(shù)、螺旋升角、滾筒寬度等滾筒結構參數(shù),滾筒轉速、牽引速度等運動參數(shù),以及采高、充滿系數(shù)、摩擦角、煤流的松散系數(shù)等。結合采煤機滾筒的結構特點和工作特點,對上述各因素對滾筒裝煤效率的影響規(guī)律進一步做了較為深入的分析,為提高螺旋滾筒的裝煤效率提供了理論依據(jù)�；陔x散元基本原理,利用PFC3D軟件建立了煤壁模型及刮板輸送機中部槽簡易模型。利用UG軟件建立了滾筒三維模型并導入PFC軟件中,與煤壁模型及刮板輸送機中部槽簡易模型共同組成了采煤機滾筒裝煤仿真模型。以某型號薄煤層采煤機為研究對象,以葉片螺旋升角、滾筒轉速、牽引速度為主要設計變量,分別對采煤機滾筒的順轉、逆轉裝煤過程進行仿真,統(tǒng)計滾筒裝煤效率以及裝煤過程中滾筒葉片包絡范圍內(nèi)顆粒速度、顆粒數(shù),得到了三個因素對滾筒裝煤效率的影響程度、影響規(guī)律以及它們最佳匹配組合。以滾筒轉速為研究重點,得到了轉速對煤流X、Y、Z三個方向分速度的影響規(guī)律,為采煤機滾筒的結構設計和實際工作中運動參數(shù)選擇提供了一定的參考價值。根據(jù)滾筒裝煤機理及采煤機工作特點,分析了煤的濕度、摩擦系數(shù)、煤巖密度、煤塊大小等煤巖性質參數(shù)對裝煤效率的影響。利用顆粒流離散元軟件仿真,重點研究了煤的摩擦系數(shù)、煤與葉片之間的摩擦系數(shù)、煤顆粒大小對滾筒裝煤效率的影響規(guī)律,為進一步完善滾筒裝煤理論內(nèi)容提供了實驗依據(jù)。采用離散元仿真方法,以尺寸規(guī)格相同的普通螺旋滾筒、錐形螺旋滾筒、變升角螺旋滾筒、葉片軸向傾斜螺旋滾筒為研究對象,從煤流的軸向速度和拋出距離兩個角度研究滾筒的裝煤能力,通過分析煤流運動軌跡及煤流與葉片的微觀作用機理,得出:滾筒逆轉時,變升角螺旋滾筒和葉片軸向傾斜螺旋滾筒可提高裝煤效率;而滾筒順轉時,葉片軸向傾斜螺旋滾筒可提高裝煤效率,通過對這兩種滾筒結構形式進行了力學分析,提出今后應從減小煤流與葉片之間的摩擦力,縮短煤流在滾筒內(nèi)部運動時間,增大煤流在滾筒內(nèi)部加速度這幾個方面對滾筒結構形式進行改進。
[Abstract]:The drum shearer is a kind of coal mining equipment which takes the spiral drum as the working mechanism. In addition to the coal cutting, its other main function is to load the cut coal into the scraper conveyor of the coal mining face. In recent decades, the coal loading efficiency of drum shearer has been the focus of the industry, while the low efficiency of thin coal seam drum shearer is more prominent. Based on the theoretical analysis and discrete element simulation method, the main structural parameters, motion parameters, coal body property parameters and drum structure form which affect the coal filling efficiency of the shearer are studied in this paper. Based on the coal loading mechanism of the shearer drum, the mechanical analysis and kinematics analysis of a coal particle on the blade are carried out, and the theoretical model for calculating the coal loading efficiency is derived. Based on the model analysis, the main factors affecting the efficiency of coal loading are obtained, such as drum diameter, blade diameter, hub diameter, blade thickness, blade head number, spiral lift angle, drum width and other drum structural parameters, drum rotational speed, etc. Traction speed and other motion parameters, as well as mining height, full coefficient, friction angle, coal flow loose coefficient. Combined with the structural and working characteristics of the shearer drum, the influence of the above factors on the coal filling efficiency of the drum is further analyzed, which provides a theoretical basis for improving the charging efficiency of the spiral drum. Based on the basic principle of discrete element, the coal wall model and the simple model of the middle slot of scraper conveyor are established by using PFC3D software. The three-dimensional model of drum is established by UG software and imported into PFC software. The simulation model of coal drum loading of shearer is made up of coal wall model and simple model of middle slot of scraper conveyor. Taking a certain type of thin coal seam shearer as the research object, taking the blade spiral rising angle, drum speed and traction speed as the main design variables, respectively, the paper simulates the coal loading process of the shearer. According to the statistics of coal filling efficiency, particle velocity and particle number in the envelop range of drum blade during coal loading, the influence of three factors on the coal loading efficiency, the influence law and the best matching combination are obtained. Taking the rotational speed of the drum as the research emphasis, the influence of the rotational speed on the speed of the coal flow in three directions is obtained, which provides a certain reference value for the structural design of the drum of the shearer and the selection of the motion parameters in the actual work. According to the coal loading mechanism of drum and the working characteristics of shearer, the influence of coal moisture, friction coefficient, density of coal and rock, size of coal block on coal loading efficiency is analyzed. The influence of coal friction coefficient, friction coefficient between coal and blade and the size of coal particle on the coal filling efficiency of roller is studied by using discrete element software of particle flow, which provides an experimental basis for further improving the theoretical content of drum charging. Using discrete element simulation method, the common spiral drum, conical spiral drum, variable lift angle spiral drum and axial inclined helical drum with the same size are studied. From the angle of axial velocity and throwing distance of coal flow, the coal loading capacity of roller is studied. By analyzing the movement track of coal flow and the microscopic action mechanism between coal flow and blade, it is concluded that when the drum reverses, The efficiency of coal loading can be improved by variable angle spiral drum and blade axial inclined helical drum, and when the roller is rotating, the blade axial inclined helical drum can improve the coal loading efficiency. The mechanical analysis of these two types of drum structure is carried out. It is suggested that the structure of the drum should be improved from the aspects of reducing the friction between the coal flow and the blade, shortening the movement time of the coal flow inside the drum and increasing the acceleration of the coal flow inside the drum.
【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TD421.6

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