独立气道式水稻旱直播气吸式排种器设计与试验OA

In view of the current problems such as large negative pressure consumption of rice drought direct seeding air suction seeder,reabsorption,leakage and poor adaptability of the seeder due to uneven distribution of air pressure at the seed suction holes.In this paper,an air-suction seed discharger with independent airway was designed for rice drought direct seeding,and firstly,the influence of independent airway design on the negative pressure distribution on the surface of the seed suction holes was studied by using Fluent to numerically simulate the flow field,and the rationality of this structure was verified.Then,the influence of the width of the air chamber on the air pressure uniformity on the surface of the seed suction holes was studied,and the flow field data of the surface of the seed absorption hole were generated by CFD—POST,and then the mathematical model of the air pressure uniformity was constructed with the sampling data,the air pressure uniformity was quantified,and the optimal size of the air chamber width was found based on the quantitative data.Finally,the main body of the 3D printed seed shooter was used to carry out the bench test research,and the bench test verified the rationality of the seed shooter.According to the data quantified by the air pressure uniformity,the size of the air chamber was 8 mm,and the air pressure uniformity and negative pressure value on the surface of the seed suction hole were good.It was determined that the optimal inlet negative pressure of the seed shooter was-1.55 kPa and the rotation speed was 26 r/min,and the pass rate was 88%,the missed seeding rate was 4.47%,and the reseeding rate was 7.53%under this working parameter.Two rice varieties with different morphologies(Luhan No.1 and Danhan No.53)were selected as test materials,and the good adaptability of the seed discharger was verified,and the pass rate was more than 82%,which met the needs of rice drought direct seeding.