基于离散元仿真的螺旋给料机出料过程分析  

Analysis of discharging process of screw feeder based on discrete element simulation

作　　者：李郁[1] 杨锋[1] Li Yu;Yang Feng

机构地区：[1]武汉理工大学交通与物流工程学院,武汉430000

出　　处：《起重运输机械》2024年第24期44-49,共6页Hoisting and Conveying Machinery

摘　　要：文中通过建立螺旋给料机出料过程的离散元仿真,分析设备出料过程中仓体内颗粒的流动规律,仿真研究得出了出料过程不同时刻下仓内颗粒位置分布云图、速度分布云图、螺旋管中的出料量变化以及螺旋体磨损量分布。分析表明出料过程中料仓内颗粒流动呈逆时针方向,后壁区域窄带颗粒流以较大速度向下流动进入螺旋体首端;螺旋体上部区域沿轴线方向形成水平料层,经螺旋体转动向前卸出给料机;前壁区域上部颗粒流与中部颗粒整体向后壁方向缓慢移动。仓体前壁与螺旋体相交处有颗粒回流,且回流区域随时间逐渐增大。整个出料过程流量稳定,表明出料量与仓内颗粒流动无关。料仓下方螺旋叶片磨损量沿输送方向增加,螺旋叶片边缘磨损量相对较大。研究内容可为此后的螺旋给料机结构性能优化工作提供较为丰富的理论基础。Through the discrete element simulation of the discharge process of the screw feeder,the flow law of particles in the silo during the discharge process of the equipment was analyzed,and the cloud map of particle position distribution,cloud map of velocity distribution,the change of discharge quantity in the spiral pipe and the distribution of screw wear at different times during the discharge process were obtained.The analysis shows that during the discharging process,the particles in the silo flow counterclockwise,and the narrow-band particle flow in the back wall area flows downward at a large speed and enters the head end of the spiral body.The upper area of the screw forms a horizontal material layer along the axis direction,and is discharged from the feeder forward by the rotation of the screw;The upper particle flow and the middle particles in the front wall area move slowly towards the back wall.There is particle backflow at the intersection of the front wall of the silo and the spiral body,and the backflow area gradually increases with time.The flow rate is stable during the whole discharging process,which indicates that the discharging amount has nothing to do with the particle flow in the silo.The wear of the spiral blade under the silo increases along the conveying direction,and the wear of the edge of the spiral blade is relatively large.This study can provide a theoretical basis for the structural performance optimization of the screw feeder.

关 键 词：螺旋给料机 离散元仿真 出料过程 颗粒流 

分 类 号：TH224[机械工程—机械制造及自动化]