毕业论文_外文翻译=牧草小区播种机排种器的设计及试验=4400字外文文献.doc

本科毕业论文（设计） 外文原文 题目： 小型播种机的设计 学 院： 机电工程学院 专 业： 机械设计制造及其自动化 班 级： 学 号： 姓 名： 指导教师： Development and experiment of seed metering for grass plot Seeder Yang Song, Zhang Shumin, Yi Jintao, Weng Qiang College of Engineering, China Agricultural University, Beijing 100083，China Abstract: In order to develop a grass plot seeder, which is suitable for cultivation of fine grass varieties, a seed metering test platform was developed which has a special designed transmission mechanism and a seed cup with an adjustable ring. Several kinds of seeds can be fed by feeding mechanism in feeding cup when seeding shaft as well as distributor cone rotates one complete revolution. Seed motion and the relationship between seed outlet and seed cup were analyzed in this paper. Result of orthogonal experiment showed that the number of sweeper blades was one of the main influencing factors of the variation coefficient of seeding uniformity. When 12 sweeper blades and 9 grooves cone were used in test, the variation coefficient of the Pacesetter’s seeding uniformity got to the minimum value 16.46%. This research provides a reference for grass plot seeder’s development. Key words: agricultural machinery, mechanisms, stress analysis, plot seeder, grass cultivation doi：10.3969/j.issn.1002-6819.2012.z2.013 Document code: A Article ID: 1002-6819 2012 -Supp.2-0072-06 CLC number: S223.2+6 0.Introduction It is important to conduct comparable tests in experimental plots with breeding, species, nutritional value and production research for grass resource and animal husbandry [1]. Therefore, plot seeder plays a key role for the research and rangeland development. The design requirements of grass plot seeder are similar with conventional plot seeder, which need to feed a uniform amount of seed over the length of aplot and seed metering must be cleaned between contiguous plots because several species and mixtures may be in the same experiment. Numerous plot seeders had been developed for ag