Numerical Simulation of Working Characteristics of Concrete Screw Conveyor Based on DEM

EasyChair Preprint 3711

Abstract

Screw conveyor is a kind of efficient and quantify discharging equipment according to the workability of materials. Based on the discrete element method (DEM), this paper establishes a screw conveyor simulation model to predict the discharging mode of concrete in the hopper and the movement of particles under the action of horizontal and combined-screws.The results show that the trapezoidal geometry structure of the hopper affects the hopper drawdown, and the particles squeeze and jam during the deposition movement, which is easy to cause the particles to agglomerate and form a "rathole formation". The movement of the particles to the screw filling area needs to be preferentially moved to the bottom of the screw to output horizontally under the shear action of the screw blade. At the same time, the cohesion of concrete particles has a great influence on the mass flow of screw continuous discharge. This provides an analytical method and theoretical basis for optimizing the geometry of the screw conveyor, improving the uniformity of the screw discharge, and reducing energy consumption.

Keyphrases: (DEM), (concrete particle flow), (hopper drawdown）, (screw conveyor)

@booklet{EasyChair:3711,
  author    = {Wenda Yu and Dong Li and Defang Zou and Shunda Yu},
  title     = {Numerical Simulation of Working Characteristics of Concrete Screw Conveyor Based on DEM},
  howpublished = {EasyChair Preprint 3711},
  year      = {EasyChair, 2020}}