弹性筛面动力学及难筛分物料的透筛机理

DYNAMICS OF ELASTIC SCREEN SURFACE AND PENETRATING MECHANISM OF DIFFICULT SCREENING MATERIAL

针对难筛分物料的弹性筛面筛分机，建立了筛分机的弹性筛面动力学模型，通过对动力学模型的理论分析，推导出弹性筛面在筛分机振动过程的弹性变形规律，并分析了各种粒度的颗粒在弹性筛面上透筛、堵孔的受力情况，给出了透筛力计算公式，指出弹性筛面透筛力大于刚性筛面透筛力，揭示了弹性筛面克服堵孔主要是筛面弹性变形的作用机理。提出在设计弹性筛面筛分机时，应将筛分机工作转速设计为筛面一阶固有频率。最后，进行了金属筛面和弹性筛面筛分机对各种含外在水分煤炭筛分的对比试验，结果表明，弹性筛面筛分机的筛分效率优于金属筛面筛分机。

The dynamic model of elastic screen surface of screening machine which screens diffcult sereening material has been set up. By theoretically analyzing the dynamic model, the deformation formula of elastic screen surface in the vibration of screening machine was derived. The penetrating and blocking forces of all kinds sizes of particles were analyzed, and the formula of penetrating force was given, then it was pointed out that the penetrating force of elastic screen surface is bigger than that of rigid screen surface. The mechanism overcoming the blocking of elastic screen surface was explained. The design formula of working revolution of elastic screening machine, which is equal to the fundamental frequency of elastic vibration of screen surface, was given. The comparison experiments between on metal screen surface and on elastic screen surface were made, the results of experiments showed that the screening technical index of the screening machine with elastic screen surface is better than that of the screening machine with metal screen surface.