YKR型振动筛筛体运动及物料透筛概率分析

利用Simulink仿真模块建立振动筛的仿真模型,得到其筛体质心及入料端、排料端的运动轨迹,然后根据筛体不同位置处垂直方向的振幅得到物料颗粒在筛面的跳动次数,最后由颗粒的透筛概率及其在筛面上的跳动次数计算不同粒级物料在入料端、质心和排料端的透筛概率。结果表明,筛体各处不同的运动轨迹使物料在筛面上运动时,从入料端到排料端,垂直方向的速度增大,水平方向的速度减小;排料端的物料透筛概率比入料端的物料透筛概率高,质心处相对粒度为0.3~0.5的物料透筛概率最高;物料运动轨迹及透筛概率的不同使得筛分过程中沿筛长方向不同位置处可得到不同粒度级的筛分产品。

Motion of YKR vibrating screen and probability of material penetrating through the screen

The simulation model of YKR vibrating screen was established by using Simulink modules and the trajectories of the screen centroid,the inlet and the outlet were obtained.The beats of material particles on the screen were also obtained according to the vertical amplitudes at different locations.Then, the screen-penetrating probabilities of materials with different sizes at the inlet,the outlet and the centroid were calculated from the general screen-penetrating probability and the number of beats of the single-particle. The results show that the trajectories at different parts of the screen lead to rising velocity in the vertical direction and decreasing velocity in the horizontal direction when materials move on the screen surface from the inlet to the outlet.The screen-penetrating probability of materials at the outlet is higher than that at the inlet,and materials with a relative size of 0.3~0.5 at the centroid has the highest screen-penetrating probability. The differences in material movement and screen-penetrating probability make it possible to obtain materials of different granularities along the length of the screen at different parts in the screening process.