Research on Sieving Performance of Flip-Flow Screen Using Two-Way Particles-Screen Panels Coupling Strategy

Bing Wu,Xiaoyan Xiong,Jian Tang,Linkai Niu,Xin Zhang,Zhixin Dong

doi:10.1109/access.2019.2938847

Bing Wu, Xiaoyan Xiong + Show 4 more

Open Access

https://doi.org/10.1109/access.2019.2938847

Copy DOI

Abstract

Sieving performance of flip-flow screen determines the profit of coal preparation plants. The validity of its research depends on the two-way coupling relationship between particles and screen panels, for which the action of particles on screen panels is not only considered, but the effect of screen panels on particles as well. However, traditional one-way coupling method merely reveals the unilateral effect of particles on flip-flow screen panels. In order to run a simulation model conformed to more realistic working conditions, this paper presents a method of DEM-MBD (Discrete Element Method-Multiple Bodies Dynamics) two-way coupling. Firstly, the principle of this method is analyzed and disadvantages of simulation are proposed. Secondly, for solving the problem that the contact area within particles and flexible panels cannot be worked in co-simulation with software EDEM and RecurDyn, we simplify the rigid panels that are similar to the real case by piecewise linear interpolation method instead of flexible panels. The bending and shrunk ratio of pores have been computed under the positions of static and outer dead point in the mid-point of similar panels, which are compared with catenary curve to reduce the relative error. Finally, the effect of rotation speed of motors and elastic modulus on screening efficiency, production ratio and vibrating velocity are studied. The results indicate that the equivalent method of approximate flexibility is effective. Additionally, we conclude that screening efficiency, production ratio and vibrating velocity will increase as rotation speed increases nonlinearly, and elastic modulus has no distinct effect on screening performance indexes.

Highlights

In coal dressing industry, flip-flow screen is a kind of newtype sieving equipment widely used for dry deep screening of moist fine coals or powder materials
SIMPLIFICATION OF THE FLEXIBLE PANELS Currently, geometries in EDEM only possess a handful of simple linear motion of rigid bodies, unable to analyze nonlinear peculiarity of flip-flow screen directly, which cause the parts of contact between particles and flexibilities could not be calculated
The co-simulation has been conducted and the contact problems solved between particles and flexible panels, the results will be discussed on the basis of the DEM-MBD coupling model

Summary

INTRODUCTION

Flip-flow screen is a kind of newtype sieving equipment widely used for dry deep screening of moist fine coals or powder materials. B. Wu et al.: Research on Sieving Performance of Flip-Flow Screen Using Two-Way Particles-Screen Panels Coupling Strategy simulated under different installment type and equivalent stresses were calculated by Wang et al [5]. What’s more, the method of orthogonal experiment coupled with DEM has been adopted to study the rules of screening motion for particles flow with banana screen surfaces [13] and circular screen [14], [15] under different vibration and geometric parameters. In order to improve the effectiveness and accuracy of flip-flow screen surfaces models, it is essential to adopt the two-way coupling method between particles and elastic panels.

THE PRINCIPLE OF CALCULATION FOR

RESULTS AND DISCUSSION

CONCLUSION