Variable elliptical vibrating screen: Particles kinematics and industrial application  

作　　者：Chenlong Duan Jiale Yuan Miao Pan Tao Huang Haishen Jiang Yuemin Zhao Jinpeng Qiao Weinan Wang Shijie Yu Jiawang Lu 

机构地区：[1]Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education,School of Chemical Engineering and Technology,China University of Mining and Technology,Xuzhou 221116,China [2]Anshan Heavy Duty Mining Machinery Engineering Technology Research Center,Anshan 114000,China

出　　处：《International Journal of Mining Science and Technology》2021年第6期1013-1022,共10页矿业科学技术学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (Nos. U1903132 and 51904301);the Natural Science Foundation of Jiangsu Province (No. BK20180650)。

摘　　要：Traditional vibrating screen usually adopts the linear centralized excitation mode,which causes the difficulty in particles loosening and low screening efficiency.The variable elliptical vibrating screen(VEVS)trajectory is regulated to adapt the material mass along the direction of the screen length,improving the particles distribution as well as the screening efficiency.In this work,a theoretical model was developed for analyzing the screen surface motion law during VEVS-based screening process.An equation was obtained to show the relationship between the horizontal amplitude and the vertical amplitude.The materials kinetic characteristics were studied by using high-speed camera during screening process.Compared with equal-amplitude screen(EAS),the material moving velocity was increased by 13.03%on the first half but decreased by 3.52% on the second half,and the total screening time was reduced by 9.42% by using VEVS.In addition,-6 mm screening test was carried out.At the length of VEVS equaled to 1.2 m,the screening efficiency and the total misplaced material content were 92.50% and 2.90%,respectively.However,the screening efficiency was 89.91% and the total misplaced material content was 3.76% during EAS-based screening process.Furthermore,when external moisture is 5.96%,the screening efficiency of VEVS could reach 86.95%.The 2 TKB50113 type VEVS with double-layered screen surface used in Huoshizui Coal Mine was 5.0 m in width and 11.3 m in length.The areas of single layer and double layer were 56.5 and 113 m~2,respectively.In industrial production,the processing capacity was 2500-3000 t/h and the screening efficiency was larger than 90%.

关 键 词：Variable elliptical screen Thin-layer and equal thickness Particles kinematics Screen length Industrial application 

分 类 号：TD452[矿业工程—矿山机电]