谷物平面清选筛驱动机构的设计说明书详解.docVIP

JIANGXI AGRICULTURAL UNIVERSITY 本 科 毕 业 论 文（设 计） 题 目： 谷物平面清选筛驱动机构的设计 学 院： 工学院 姓 名： 学 号： 专 业： 农业机械化及其自动化 年 级： 指导教师： 职 称：讲 师 二0一三 年 五 月 摘要 当前全球进行谷物清选主要采用筛选、空气动力选、表面特性选、比重选等几种方式。其中, 运用最多的一种形式是筛选,其使谷物在筛面上运动,利用其不同的尺寸形状的特征,把混合物分成通过筛孔和不能通过筛孔的两部分,即将谷物群体中的大小杂物清除,而保留饱满成熟谷粒。筛体的运动轨迹是影响谷物清选净度的重要因素。 关键字： 清选 驱动 平面振动 Abstract Current global grain cleaning mainly adopts filter, air power to choose, surface features, such as proportion of selected several ways. It, a form is most often used to screen, it makes the grain movement on the screen, use the different size of shape characteristic, divide the mixture into through the mesh and not through the screen mesh of two parts, the grain size of the group clear debris, and keep full ripe grains. Sieve body movement is the important factors that affect grain cleaning clarity. This design adopts the thickness according to the grain separation of long hole grain cleaning sieve, sieve body you just need to make lateral horizontal vibration. To ensure that the vibrating screen has a good sieving performance and higher productivity, first, it makes the grain from the blanking hole after fall on the screen, the width of the scatter increase, increase the effective screening area. Second, must also enables grain and sundries in the screening process can continuously moved to discharge port. Therefore this design sieve body trajectory as follows: the sieve body in the materials falling plane circular motion, then slowly changed from plane circular motion to planar elliptical motion, the short axis gradually become smaller, in the end of the screen body transition to reciprocating linear motion. This trajectory can make the material behind does not produce accumulation phenomenon and evenly distributed on the sieve surface, make the material can fully contact