刮板输送机煤散料输送模拟与中部槽磨损分析

发布时间：2018-06-19 21:24

本文选题：刮板输送机 + 中部槽　；参考：《太原理工大学》2017年硕士论文

【摘要】：刮板输送机是井下煤炭综采工作面的主要设备。当前对于刮板输送机中部槽的设计和研究主要采用的是有限元分析法,将刮板输送机中部槽中的散料视为连续的整体,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关力学方程,并通过三维建模软件及有限元分析软件进行模拟仿真,从而得到结论。并且以往对中部槽磨损的研究大多都是在中部槽结构设计、表面工艺处理、材质选择等方面。但散料是一种颗粒物质,在散料内部、散料与几何体之间都存在着不可忽视的力学作用,因此,应用离散单元法可以更为准确的研究散料内部以及散料与几何体之间的力学作用,获得更合理的结果。本文应用和建立煤散料输送模拟分析模型对煤炭散料的分布状态和运动行为进行分析,以及建立煤散料输送的离散元磨损分析模型来研究煤散料对中部槽的磨损作用,结果表明:刮板输送机中部槽在局部严重堆积工况下,堆积的煤颗粒分布在正常运输煤颗粒的两侧,并且随着刮板输送机的向前运行,堆积煤颗粒会散落在中部槽两侧槽帮上,煤散料局部严重堆积时中部槽的平均磨损深度明显要比局部轻度堆积工况时大。中部槽底板倾斜向一边时,中部槽中的煤散料会堆积在倾斜的一侧,如果倾斜角度较大,并且输送的煤散料较多时,将会有煤散料从倾斜一侧的槽帮散落,从而降低刮板输送机的运输效率。在中部槽上煤颗粒和矸石颗粒是随机分布的,矸石颗粒硬度比煤颗粒要大,形状棱角分明尖锐,因此煤散料中含矸石量越多,中部槽磨越严重,并且煤颗粒的硬度和粒度增大时,煤颗粒的质量也会增大,截齿截割煤壁,煤颗粒下落到刮板输送机上时,颗粒对中部槽的冲击作用和碰撞加速作用越明显,从而加大中部槽的磨损深度;刮板输送机中部槽铺设倾角为°和刮板链链速越大时,刮板输送机的质量流率较大,但是此时中部槽的磨损都也较为严重。将与进行耦合以获得运输过程中由煤散料对中部槽的磨损和冲击作用所造成的应力与变形特性,进而对中部槽的磨损部位进行细致分析,靠近落煤地点的中部槽的最大变形的值和最大应力的值较大,随着远离落煤地方逐渐减小,磨损深度也不断减小;由磨损云图和应力应变云图可知中部槽的主要磨损部位为链道附近,其他部位磨损相对较小。根据本文的研究内容和试验的可行性,初步制定了试验方案,该试验方案分为以下五个部分:试验目的、试验装置、试验材料、试验条件、试验方法。
[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 掳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.
【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD528.3

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