亚洲一区欧美在线,日韩欧美视频免费观看,色戒的三场床戏分别是在几段,欧美日韩国产在线人成

According to the existing problems of no-till corn seeding in full straw returning in the northeastern part of China, such as the low stubble removal rate in seeding row, the secondary cover of seeding row after sowing caused by the return of straw under the action of wind, a row cleaner with side cutter and stubble clean disk was developed. The stubble-breaking performance was analyzed to determine the type, size and installation parameters of cutter. Through the analysis of the trajectory of straw and topsoil under the action of stubble clean disk, the main parameters of the stubble clean disk affecting the stubble removal rate and the straw returning were clarified as follows: radius of gyration, radius of curvature and length of teeth. The simulation experiment of quadric rotation orthogonal combination was carried out in discrete element software EDEM, taking the stubble removal rate and the amount of straw covering soil as evaluation indexes, the optimal parameter combination of the stubble clean disk was determined as follows: the radius of gyration was 163mm, the radius of curvature was 350mm, and the length of teeth was 52mm. The best parameter combination was used for field verification test, which showed that the stubble removal rate and the amount of straw covering soil were 91.4% and5833cm3/m2 under the 20cm clear width, which was similar to the simulation results. After the operation of the combine of side cutter and stubble clean disk, the straw between the rows was covered by the topsoil of the row and there was no straw return phenomenon, which satisfied the agronomic and technical requirements of no-till seeding.