气力式牧草免耕种机结构分析与性能试验研究.pdfVIP

摘 要 随着近年来草原退化、沙化现象日益严重，更具科学性的牧草播种机的研制迫 在眉睫。9BQM-3.0 型气力式牧草免耕播种机的气力式排种器使种子在气流的作用下 分配和排出，有效解决了小粒种子播量稳定性差、堵塞、架空等问题。 本文运用 Fluent 软件对气力式排种器进行运动分析，模拟种子在气流中的运 动，分析排种器中气流的速度与压力情况，说明了该装置的合理性。通过对性能试 验和生产试验的研究，测量排种均匀性、各行排量一致性、总排量稳定性等指标， 得出排种均匀性变异系数苜蓿是10.67%，披碱草是27.10%，玉米是39.64%，各行 排量一致性变异系数苜蓿是2.32%，披碱草是5.36%，玉米是6.76%，总排量稳定性 变异系数苜蓿是1.22%，披碱草是3.41%玉米是2.27%，表明该播种机排种不受种子 外形尺寸和重力等物理特性的影响，且通用性好，播种效率高，适用性广，排种均 匀，可实现高速单粒体排种。 分析了该播种机近几年的经济效益、社会效益和生态效益，为其进一步的推广 奠定良好基础；总结了目前社会推广模式存在的农机技术需求与供给严重不平衡、 推广人员分布不合理、技术推广体系落后等问题，通过分析提出了市场型农机推广 模式、产业型农机推广模式、园区型农机推广模式和协作型推广模式四种新型推广 模式，为农机推广工作提供更好的依据。 关键词：气力式；免耕播种机；排种器；Fluent Structured Analysis and Performance Test Study on Pneumatic-type Herbage No-till Planter Abstract In recent years, with grassland degradation, desertification phenomenon becomeing more and more serious, more scientific research of forage seeder is imminent. The pneumatic metering device of 9BQM―3.0 pneumatic-type herbage no-till planter through the air force distribute and discharge the seed that could resolve the bad stability of seeding rate, the jam,aerial,etc about to small seeds. The paper use fluent to analysis the pneumatic metering device,simulating the motion of seeds in the air,analysising the air flow speed and pressure situation in the pneumatic metering device,showing that this device is reasonable.Through to the performance test and production test research,analysis the uniformity of the line seeding,the consistency of the line seeding quantity,the stability of the total seeding quantity,etc index,drawing variation coefficient of uniformity of the line seeding such as 10.67% Alfalfa, 27.10% Elymus, 39.64% Corn ,variation coefficient of consistency o