摘要随着农业机械化的发展，农作物种子清选机械也日趋成熟，其中正压式重力清选机发展最快最成熟。通过查阅大量文献资料和现场实习，设计出5XZ-3.0型正压式重力清选机，其生产率为3.0t/h。该机通过双向倾斜且往复振动的工作台和穿过工作台面由下而上的气流进行清选作业，适用于经过风筛式清选机、窝眼滚筒清选机等机具清选过的外形、尺寸较相似的种子分选。该机具利用比重不同分离出发育不好、成熟不完全、受虫害霉烂和已发芽的种子，以及与种子尺寸相近而质量有一定差异的夹杂物。关键词正压式重力清选机双向倾斜往复振动AbstractWiththedevelopmentofagriculturalmechanization,thecropsseedcleanerweaponisalsogettingmoreandmoreprogressive,thepositivepressuretypegravitycleanerdevelopmentismostcommon.Throughtheconsultmassiveliteraturematerialandtheworkshoppractice,designsthe5XZ-3.0positivepressuretypegravitycleaner,itsproductivityis3.0t/h.Thisequipmenttorealizechoosesthefunctionclear,throughcaninclineandvibratetheworktableandpassesthroughworkflooraircurrentfrombottomtotoptocomplete,itissuitableforthecontourwhichthesizesimilarseedseparationpassesthroughprimaryelectsclear.Theequipmentusedtoseparatedifferentproportionsofpoor,immature,andhasbeensubjecttopestsorgerminationofseeds,andseedwithsimilarsizeandqualityofacertaindifferenceofimpurities.KeywordPositivepressuretypeGravitycleanerTwodirectionanglesmayadjustReciprocatingvibration目录TOC\o"1-3"\h\z\uHYPERLINK\l"_Toc200356204"摘要PAGEREF_Toc200356204\hIHYPERLINK\l"_Toc200356205"AbstractPAGEREF_Toc200356205\hIIHYPERLINK\l"_Toc200356206"第1章绪论PAGEREF_Toc200356206\h1HYPERLINK\l"_Toc200356207"1.1国内外发展情况PAGEREF_Toc200356207\h1HYPERLINK\l"_Toc200356208"1.2结构特点与分类PAGEREF_Toc200356208\h3HYPERLINK\l"_Toc200356209"1.2.1结构特点PAGEREF_Toc200356209\h3HYPERLINK\l"_Toc200356210"1.2.2分类PAGEREF_Toc200356210\h3HYPERLINK\l"_Toc200356211"1.3工作原理PAGEREF_Toc200356211\h4HYPERLINK\l"_Toc200356212"1.3.1重力分选原理PAGEREF_Toc200356212\h4HYPERLINK\l"_Toc200356215"1.3.2物料的分层化过程PAGEREF_Toc200356215\h5HYPERLINK\l"_Toc200356216"1.4应用范围PAGEREF_Toc200356216\h8HYPERLINK\l"_Toc200356217"第二章无级变速部分的设计方案及选择PAGEREF_Toc200356217\h9HYPERLINK\l"_Toc200356219"第三章设计计算PAGEREF_Toc200356219\h10HYPERLINK\l"_Toc200356220"3.1总体参数及运动参数的选择P