井下液压式选择性煤矸分离装备关键技术研究

发布时间：2018-06-11 12:47

本文选题：井下 + 液压式　；参考：《安徽理工大学》2015年硕士论文

【摘要】：煤炭开采伴随着大量矸石的产生,造成地面大量矸石山的堆积,为实现绿色开采目标,对井下开采出来的矸石直接分选,分选出的矸石直接用于采空区的充填,这样既可以减少矿区的环境污染也可以有效控制采空区塌陷带来的危害。根据煤和矸石的硬度特性的差异,提出一种新的井下液压式选择性煤矸分离装备。为此,本文结合了理论研究、实验数据和仿真模拟方法,对井下液压式选择性煤矸分选装备的关键技术进行研究。基于井下液压式选择性煤矸分离装备结构和挤压破碎过程特点,在现有的破碎强度理论和破碎能耗理论基础上,建立了点载荷破碎力学模型,并建立了在拉应力下和剪应力作用下,煤矸发生破坏的破碎准则；建立了单颗粒煤岩挤压破碎的屈曲分析有限元模型,对实验数据和理论仿真结果处理,拟合得到物料的抗压强度和屈曲强度之间的关系。基于评价煤矸破碎分选效果的两个指标一丢煤率和混矸率,给出了三种临界破碎载荷下的最大丢煤率和最大混矸率的计算公式,建立了煤矸选择性破碎分选准则；设计了井下液压式选择性分选装备,介绍了装备破碎分选原理和破碎分选液压回路工作原理；对物料挤压过程时装备的关键部件进行了力学分析,推导出了液压缸设置的压力值与煤矸颗粒的破碎载荷的关系式,对分离装备的偏心凸轮的运动学分析,给出了物料的挤压受力特性,通过对偏心凸轮上挤压点的位移、速率、加速度分析,研究了偏心凸轮运动特性。通过ANSYS Workbench接触仿真分析,探究了一定范围下的压板倾角对煤或矸石破碎效果的影响,研究表明：压板倾角在15。时,煤和矸石的选择性破碎效果最好；为寻找特定设备的处理粒度范围,探究了一定范围的入料粒度对破碎效果的影响,对物料破碎前的分级处理具有一定指导意义。
[Abstract]:Coal mining is accompanied by the accumulation of a large amount of coal gangue , which causes the accumulation of a large amount of waste rock in the ground . In order to achieve the goal of green mining , the coal gangue which is mined out is directly used for the filling of mined areas , so that the new underground hydraulic selective coal and gangue separation equipment can be effectively controlled according to the difference between the hardness characteristics of the coal and the gangue , and the key technology of the underground hydraulic selective coal and gangue separation equipment is studied according to the difference between the hardness characteristics of the coal and the gangue .

On the basis of the existing theory of crushing strength and energy consumption theory , a point load crushing mechanical model is established based on the characteristics of the structure and crushing process characteristics of the underground hydraulic selective coal refuse separation equipment structure and the crushing energy consumption theory , and the breaking criterion of the damage of the coal gangue under the action of tensile stress and shear stress is established ;
A finite element model for buckling analysis of single - particle coal - rock extrusion crushing is established , and the relationship between compressive strength and buckling strength of the material is obtained by processing experimental data and theoretical simulation results .

Based on the evaluation of two indexes of coal and gangue crushing and sorting effect , a formula for calculating the maximum coal loss rate and the maximum coal blending ratio in three critical crushing loads is given , and the criterion of selective crushing and separation of coal and gangue is established .
The principle of equipment crushing and sorting and the working principle of crushing and sorting hydraulic circuit are introduced in this paper .
Based on the mechanical analysis of the key parts of the equipment during the extrusion process of the material , the relation between the pressure value set by the hydraulic cylinder and the crushing load of the coal gangue particles is derived . The kinematics analysis of the eccentric cam of the separation equipment is derived . The displacement , rate and acceleration of the extrusion point on the eccentric cam are analyzed , and the eccentric cam motion characteristics are studied .

Through the analysis of ANSYS Workbench contact simulation , the influence of pressure plate inclination angle on the crushing effect of coal or gangue has been studied . The results show that the selective crushing effect of coal and gangue is the best when the inclination of the pressing plate is 15 .
In order to find the processing granularity range of the specific equipment , the influence of the particle size on the crushing effect is explored , which has some guiding significance to the grading treatment before the material crushing .
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD849.5

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