气力输送式小麦播种机垂直型分配器设计与试验

传统小麦播种机存在作业效率较低、生产成本高、各行排量一致性差等问题,设计了一种适用于气力输送式小麦播种机的垂直型分配器.分配器采用垂直分配的种子分配方式,能使种子运动轨迹平滑,运动方向变化小,实现种子均匀分配.通过研究种子在分配器内部的受力情况,确定了风速、圆锥角度等对排种性能影响较大的关键参数;采用Flow Simu...

Design and Experiment of Pneumatic Transport Vertical Distributor for Wheat Seeder

Aiming at the problems of poor consistency of each row,high production cost,low operation efficiency.The technology has been studied and an pneumatic transport vertical distributor for wheat seeder was designed,the distributor adopts an upwardly distributed seed distribution mode,which makes the seed movement trajectory smooth and the movement direction changes little.This type of distribution reduces turbulence inside the dispenser and improves the consistency of the rows.The force and movement state of the seed inside the dispenser were studied.The main force of the seed in the flow field is the drag force generated by the relative velocity of the airflow and the seed,the gravity of the seed itself,and the lift generated by the rotation.The main factors of wheat seed movement direction are airflow velocity,Cone angle,wheat type,and changes in seed trajectory will directly affect the consistency.These factors need to be analyzed.Flow Simulation was used to simulate the internal flow field of the distributor.The state of the airflow field under different cone angles and wind speeds was determined.When the cone angle was too small or too large,the turbulence in the distributor were more.When the wind speed increased,the turbulence inside the dispenser will also increase.The pneumatic conveying type wheat seeding inspection platform was built.The wind velocity and rotating speed of seed meter can be directly controlled by the test bed control system,and the cone angle can be changed by replacing the conical cover of different specifications.The factors that have a great influence on the performance of the seeding system are rotating speed of seed meter,cone angle and wind velocity.Taking the rotating speed of the seed meter,the cone angle and the wind velocity as the test factors,the orthogonal test was carried out with the consistency of each row.It is determined that the combined parameter wind velocity is 15m/s,the rotating speed of seed meter is 40r/min,and the cone angle is 90°.Under this condition,the discharge consistency of each row is 2.78%,which is lower than the relevant standards for wheat sowing.This study provides a reference for the research and development of pneumatic conveying wheat planters.