本文選題：刮板輸送機 + 中部槽�。� 參考：《太原理工大學》2017年碩士論文

【摘要】：刮板輸送機是井下煤炭綜采工作面的主要設備。當前對于刮板輸送機中部槽的設計和研究主要采用的是有限元分析法,將刮板輸送機中部槽中的散料視為連續(xù)的整體,或直接以外力形式作用在中部槽上,利用有限元分析法建立相關力學方程,并通過三維建模軟件及有限元分析軟件進行模擬仿真,從而得到結論。并且以往對中部槽磨損的研究大多都是在中部槽結構設計、表面工藝處理、材質選擇等方面。但散料是一種顆粒物質,在散料內部、散料與幾何體之間都存在著不可忽視的力學作用,因此,應用離散單元法可以更為準確的研究散料內部以及散料與幾何體之間的力學作用,獲得更合理的結果。本文應用和建立煤散料輸送模擬分析模型對煤炭散料的分布狀態(tài)和運動行為進行分析,以及建立煤散料輸送的離散元磨損分析模型來研究煤散料對中部槽的磨損作用,結果表明:刮板輸送機中部槽在局部嚴重堆積工況下,堆積的煤顆粒分布在正常運輸煤顆粒的兩側,并且隨著刮板輸送機的向前運行,堆積煤顆粒會散落在中部槽兩側槽幫上,煤散料局部嚴重堆積時中部槽的平均磨損深度明顯要比局部輕度堆積工況時大。中部槽底板傾斜向一邊時,中部槽中的煤散料會堆積在傾斜的一側,如果傾斜角度較大,并且輸送的煤散料較多時,將會有煤散料從傾斜一側的槽幫散落,從而降低刮板輸送機的運輸效率。在中部槽上煤顆粒和矸石顆粒是隨機分布的,矸石顆粒硬度比煤顆粒要大,形狀棱角分明尖銳,因此煤散料中含矸石量越多,中部槽磨越嚴重,并且煤顆粒的硬度和粒度增大時,煤顆粒的質量也會增大,截齒截割煤壁,煤顆粒下落到刮板輸送機上時,顆粒對中部槽的沖擊作用和碰撞加速作用越明顯,從而加大中部槽的磨損深度;刮板輸送機中部槽鋪設傾角為°和刮板鏈鏈速越大時,刮板輸送機的質量流率較大,但是此時中部槽的磨損都也較為嚴重。將與進行耦合以獲得運輸過程中由煤散料對中部槽的磨損和沖擊作用所造成的應力與變形特性,進而對中部槽的磨損部位進行細致分析,靠近落煤地點的中部槽的最大變形的值和最大應力的值較大,隨著遠離落煤地方逐漸減小,磨損深度也不斷減小;由磨損云圖和應力應變云圖可知中部槽的主要磨損部位為鏈道附近,其他部位磨損相對較小。根據本文的研究內容和試驗的可行性,初步制定了試驗方案,該試驗方案分為以下五個部分:試驗目的、試驗裝置、試驗材料、試驗條件、試驗方法。
[Abstract]:Scraper conveyor is the main equipment of coal mining face. At present, the design and research of the middle slot of scraper conveyor is mainly based on the finite element analysis method. The loose material in the middle slot of scraper conveyor is regarded as a continuous whole or acted directly on the middle slot by external force. The related mechanical equations are established by using finite element analysis method, and the simulation results are obtained by using 3D modeling software and finite element analysis software. And in the past, most of the research on the middle groove wear is in the middle groove structure design, surface processing, material selection and so on. But the bulk material is a kind of granular material. In the bulk material, there is a mechanical function which can not be ignored between the bulk material and the geometry. The application of the discrete element method can more accurately study the mechanical action between the bulk material and the geometry, and obtain more reasonable results. In this paper, the distribution state and movement behavior of coal bulk are analyzed by using and establishing the simulation analysis model of coal bulk transportation, and the discrete element wear analysis model of coal bulk transportation is established to study the wear effect of coal powder on the middle slot. The results show that the coal particles distributed on both sides of the normal transport coal particles under the condition of local serious stacking in the middle slot of the scraper conveyor, and with the moving forward of the scraper conveyor, the accumulated coal particles will be scattered on the side of the groove on both sides of the middle slot. The average wear depth of the central trough is obviously larger than that of the local mild stacking condition. When the bottom plate of the middle slot tilts to one side, the coal particles in the middle slot will accumulate on the inclined side. If the angle of inclination is large and the coal mass is more transported, there will be coal scattered from the sloping side of the slot. Thus reducing the transport efficiency of scraper conveyor. Coal particles and gangue particles are randomly distributed in the central trough. The hardness of the gangue particles is greater than that of the coal particles, and the shapes are sharp and sharp. Therefore, the more gangue in the coal powder, the more serious the grooves are. And when the hardness and particle size of coal particles increase, the quality of coal particles will also increase. When cutting off the coal wall and dropping the coal particles onto the scraper conveyor, the impact action and collision acceleration action of coal particles on the middle groove are more obvious. As a result, the wear depth of the middle slot is increased. When the laying angle of the middle slot of the scraper conveyor is 擄and the chain speed of the scraper chain increases, the mass flow rate of the scraper conveyor is larger, but the wear of the middle slot is also more serious. In order to obtain the stress and deformation characteristics caused by the abrasion and impact of coal particles on the middle slot during the transportation, the wear position of the middle slot is analyzed in detail. The maximum deformation value and maximum stress value of the middle trough near the coal caving place is larger, and the wear depth decreases with the distance from the coal caving place. According to the wear cloud diagram and the stress-strain cloud map, the main wear parts of the middle groove are near the chain channel, while the other parts are relatively small. According to the research content and feasibility of this paper, a preliminary test scheme is established, which is divided into the following five parts: the purpose of the test, the experimental equipment, the test materials, the test conditions and the test methods.
【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】：TD528.3

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