Effect of single／double screw feeder on contact force of particles
1. School of Mechanical Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2. Key Laboratory of Modern Agricultural Equipment and Technology, Ministry of Education, Jiangsu University, Zhenjiang, Jiangsu 212013, China
Abstract：To study the movement characteristics and variation law of particles in the discontinuous feeding process of screw feeder, the effect of single/double screw feeder on the contact force of particles was studied. The millet with 1.5 mm diameter was taken as research object, and the contact force among particles and the contact force between particles and trough were analyzed based on Hertz-Mindlin particle non-sliding contact model. The screw feeding model with feeding device was established. EDEM discrete element software was adopted to simulate the discontinuous feeding process of millet particles by intermittent rotation 60°. The normal and tangential pressure distributions between particles and particle groups on the inner wall of screw feeding tube were calculated. The contact force distribution characteristics of particle groups in single/double screw feeding at 240 r?min-1 speed were compared. The results show that the particles are compact but easy to roll in the single-flight screw feeder. The stability of screw discontinuous quantitative feeding is better in the double-flight feeder. The particles are not easy to roll at the inner wall, and the axial movement of particles occurs easily with the shaft.
石云飞, 张西良, 徐云峰, 卢成轩, 史玉坤. 加料机单、双头螺旋对颗粒群接触力的影响[J]. 江苏大学学报（自然科学版）, 2019, 40(1): 76-81.
SHI Yun-Fei, ZHANG Xi-Liang, XU Yun-Feng, LU Cheng-Xuan, SHI Yu-Kun. Effect of single／double screw feeder on contact force of particles[J]. Journal of Jiangsu University(Natural Science Eidtion)
, 2019, 40(1): 76-81.
2019, Vol. 40 
