正负压式藜麦精量排种器设计与试验OA

A positive-negative pressure precision seed-metering device with disturbed seed-filling mechanism structure for quinoa seeds was designed to address the difficulties of seed filling and cleaning caused by small specific gravity,small size,and irregularity of quinoa seeds.This structure optimized the filling performance of the seed-metering device and re-duced the power consumption of the fan.Positive pressure seed cleaning solved the problem of pore blockage caused by small and light quinoa seeds,and improved the working stability.Simulation analysis of the flow field in the air chamber of the seed-metering device was carried out by Fluent software,the influence of pore structure parameters(pore shape and number,pore inclination angle,and pore diameter)on the flow field of the air chamberwas analyzed by pressure cloud maps and flow velocity vector maps.The optimal parameter combinations were obtained as follows:pore shape was a cir-cular cone,the number of porewas 20,pore inclination angle was 70°,and pore diameter was 1 mm.Through the JPS-12 seed-metering devicetest bench,the response surface tests were carried out with the seed spacing qualified index,missing seeding index and reseeding index as the test indexes,the negative pressure of seed suction,speed of seed-metering de-vice and the seed throwing height as test factors.The optimal working parameters combination wasas follows:the seed suc-tion negative pressure was-3.0 kPa,the speed of seed-metering device was 15 r/min,the seed throwing height was 100 mm.The verification test of the optimized seed-metering device was carried out,and the results showed that the qualified index was 82.5%,the missing seeding index was 6.5%,and the reseeding index was 11%,which met the index require-ments in JB/T 10293-2013"Technical Conditions of Single(Precision)Seeder".The research results could provide ref-erence for the design of precision seeding machinery for small grain seeds such as quinoa.