| Numerical simulation of working process of screw conveyer based on discrete element method |
|
View Fulltext View/Add Comment Download reader |
| |
| DOI：10.7606/j.issn.1000-7601.2016.06.43 |
| Key Words: harvester screw conveyor discrete element method EDEM broken rat |
| Author Name | Affiliation | | ZHANG Ke-ping | College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China
College of Engineering, Gansu Agricultural University, Lanzhou 730070, China | | WANG Guo-hua | College of Engineering, Gansu Agricultural University, Lanzhou 730070, China | | CHAI Qiang | College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China |
|
| Hits: 1241 |
| Download times: 861 |
| Abstract: |
| In order to verify the feasibility of applying combined conveyor device into small harvester and research the flow rule of grain, this paper based on the granular mechanics, according to the discrete element method (DEM) analyzed the conveying mechanism of screw conveyor. Through established the three-dimensional model of conveyor, analyzed its movement in conveyor taken pea as an example. applying the visual discrete element simulated software EDEM analyzed the change situation of pea grain contact numbers, pea velocity, pea pressure and total energy consumption during conveying process by equal and variable pitch of screw, preliminarily discussed the cause of grain broken, and experimental verification has been conducted for the convey speed and broken rate . The results showed that: Relative to the equal pitch transportation, by variable pitch transportation the conveying velocity can be increased, while the energy consumption can be reduced, also the grain pressure and large contact numbers were mainly concentrated in the early conveying period. So the variable pitch transportation was not only increased the conveying efficiency by raising the conveying grain speed, but also reduced the squeeze and friction between particles and grain with blades, and then improved the grains broken phenomenon in conveying process. The maximal grain pressure force position was mainly concentrated between the external diameter of screw blade and case inner wall and the junction of two conveyers. |
|
|
|