Optimization design and experiment of open corn threshing device based on longitudinal axial flow
[Objective]This study aims to solve the problem of high grain breakage rate and un-threshing rate in the current corn grain harvest process,and meet the requirements of corn grain harvest in the Huang-Huai-Hai area.[Method]The longitudinal axial flow open corn threshing device was designed,with a spike-type threshing element,which was distributed on the spokes in an equally spaced spiral arrangement.The threshing device was simulated and analyzed using EDEM software to determine the optimal drum speed parameters.A single factor experiment was conducted on the threshing device using drum speed,feed rate,and moisture content as experimental factors,and an optimal parameter combination was obtained as follows:drum speed was 350.00 r·min-1,feeding amount was 8.00 kg·s-1,moisture content was 25.90%±1%.[Result]The orthogonal test determined that the primary and second-ary factors were successively moisture content,drum speed,and feeding amount.When the drum speed was 400 r·min-1,the feeding amount was 8.66 kg·s-1,and the moisture content was 15.90%,the breaking rate was 3.99%,and the un-threshing rate was 0.39%.The validation test of the threshing device bench showed that under this parameter combination,the breaking rate and un-threshing rate were 4.27%and 0.51%respectively,the difference between the breaking rate and the theoretical optimi-zation value was 0.28%,and the difference between the un-threshing rate and the theoretical optimization value was 0.12%,indicating that the test results are very close to the theoretical optimization value.[Conclusion]This device can meet the requirements of the national standard for direct harvesting of corn kernels,providing theoretical basis and new research ideas for the development of corn kernel harvesters.
万方数据
维普
