Research On Airflow Cleaning Device Used On Plot Wheat Combine Harvester

Cereal cleaning is highly critical of the agricultural plot combines a part, combine harvester choose the function of the separation system is after threshing cylinder separated grain mixture of impurities clean. As part of the key plot harvester, the in field work efficiency and function quality can directly affect the level of stable operation and quality of grain cell harvester, including especially on the selected grain cleaning rate and loss rate. So the design of the cleaning device must improve the clean rate of the grain harvester and the loss rate of the grain.. The design will be in generally clear selection device based on(usually combine with double fan sieve Shi Qing sorter) double fan sieve type and air cylinder(cyclone separator tube) using a combination of new cleaning system. Change the traditional combine harvester cleaning device cleaning rate lower shortcomings, and according to plot harvester of experimental fields of grain cleaning rate high, the breakage rate low harvest technology requirements, focusing on of cleaning system in the cyclone tube were designed and studied in this paper, research grain mixture in from the motion law of the tube, integrated use of computing fluid mechanics, the discrete element method and its coupling to the theoretical knowledge of Qing selection device were analyzed, and the computational fluid dynamics software FLUENT and the particle discrete element software EDEM coupling under different parameters of Qing selection device simulation, for the selected device structure optimization to provide theoretical support. It also provides a new way for the exploration of the new separation device, which has important research value.. The main contents of this paper are as follows:This paper mainly carries on the design of the cyclone separating cylinder, analysis of the influence of some structural parameters of cyclone tube efficiency, air cylinder type of device by using CFD-DEM coupling(cyclone tube) by numerical simulation and research. The analysis results show that the grain formation, under the effect of vortex tube wall along the spiral downward movement in the air, the speed decreases gradually, grain accumulation in the cone part, and stay in the cone part long time, extend the grain into the set of granary time, affected the grain collection efficiency, influence the structure size of double cone some may be caused by the need, the mechanism parameters were improved. Most of the wheat large collision with one side of the cylinder wall at the entrance of the position near the center axis, therefore to meet other conditions, the width of the entrance should be as small as possible. Analysis of the influence of different structural parameters on the grain trajectory by using CFD-DEM coupling technology. The analysis results show that the cylinder and cone section increases the height of the separation tube grain trajectory has a good effect, the straight cylinder section diameter smaller is conducive to grain in the separating cylinder movement, but the collision kernel and the cylinder wall is more intense. On the basis of the separation cylinder is improved and the simulation analysis of the improved structure parameters.