机械5

牧草联合收割作业已经非常普及，但收割过后牧草散落草地，导致因季节性牧草过剩而得不到合理利用被废弃,不仅浪费了牧草资源,造成经济损失,同时也污染了草地和环境，人工收集则费时费力。使用牧草打捆机可将农作物收割过后的牧草直接打成捆进行收集，方便人们运输和储存，减轻农民体力劳动。本文总结已有打捆机的成熟经验，吸收国外打捆机的先进技术，设计符合生产需求的牧草打捆机，对机器的设计原理和工作过程进行分析，对相关参数进行论证设计。本文在前人研究的基础上，运用现代设计方法进行了这方面的探讨。 关键词：打捆机，相关参数，设计原理，工作过程 ABSTRACT I
n Chi
na, grass combi
ned harvesti
ng work has bee
n very popular, but after the harvest grass scattered grassla
nd, cause because of seaso
nal forage surplus a
nd
not to the ratio
nal use of the aba
ndo
ned,
not o
nly a waste of forage resources, resulti
ng i
n eco
nomic losses, at the same time the grassla
nd a
nd e
nviro
nme
ntal pollutio
n, artificial collectio
n is time-co
nsumi
ng a
nd laborious. The use of forage harvester ca
n be harvested after the harvest of crops directly i
nto a bu
ndle of hay to collect, facilitate the people to tra
nsport a
nd storage, reduce the physical labor of farmers. This paper summarizes the existi
ng baler mature experie
nce, absorb foreig
n adva
nced tech
nology of baler, desig
ned to meet the dema
nd for the productio
n of forage bali
ng machi
ne a
nd the desig
n pri
nciple a
nd worki
ng process of machi
ne are a
nalyzed a
nd the releva
nt parameters for desig
n verificatio
n. O
n the basis of previous studies, this paper discusses the use of moder
n desig
n methods i
n this area. Keywords: Bu
ndli
ng machi
ne, related parameters, desig
n pri
nciple, worki
ng process 目录 1绪论4 1.1问题的提出4 1.2国内外研究现状及发展趋势4 1.2.1饲草压缩理论的研究概况4 1.2.2国外打捆机的发展概况7 1.2.3国内的研究状况8 1.2.4发展趋势8 1.3存在的问题8 1.4研究的目的和意义8 2牧草打捆机的设计10 2.1饲草压缩理论研究10 2.1.1饲草压缩过程研究10 2.1.2压缩力的分析11 2.2打捆机的结构设计12 2.2.1打捆机的结构型式12 2.2.2打捆机的构造和工作原理13 2.2.3飞轮15 2.2.4捆扎机构17 2.2.5主要技术参数的确定19 3.选择电动机20 3.1选择电动机的类型20 3.1.3确定总的传动比22 3.2计算传动装置运动和动力参数22 3.2.1计算各轴的转速22 3.3确定蜗轮蜗杆的尺寸22 3.3.1选择材料确定其许用应力22 3.3.2确定其许用应力23 3.4校核齿根弯曲疲劳强度24 3.5蜗杆传动的热平衡核算24 3.6蜗杆轴的设计25 3.7蜗杆轴的结构设计27 3.8轴的校核27 3.9蜗轮轴的设计和计算28 3.10滚动轴承的选择及其计算30 总结33 致谢34 参考文献35