本科论文目 录摘 要...................................................................................................................IAbstract..................................................................................................................I引 言...................................................................................................................11 概述....................................................................................................................21.1 白菜收获机的应用及适用范围...............................................................21.2 白菜收割机(机械)的国内外发展情况....................................................21.3 课题研究的内容及方法...........................................................................31.3.1 主要的研究内容..............................................................................31.3.2 设计方法..........................................................................................31.4 本章小结...................................................................................................42 总体方案设计....................................................................................................52.1 设计内容及要求.......................................................................................52.2 方案设计...................................................................................................52.2.1 白菜种植特点..................................................................................52.2.2 总体方案设计..................................................................................52.3 本章小结...................................................................................................63 大白菜收获机主要零部件设计........................................................................73.1 电机的选型...............................................................................................73.2 收割刀的设计.......
