搜索
I目录第一章绪论...........................................................................................................................................-1-1.1玉米在我国的分布概况....................................................-1-1.2玉米秸秆处理利用现状....................................................-1-1.3焚烧和粉碎还田的比较....................................................-1-1.4国内外秸秆还田技术发展现状..............................................-2-1.5秸秆还田机具种类及优缺点................................................-2-1.6秸秆还田机的工作原理....................................................-2-1.7本次毕业设计的设计任务及目的意义........................................-3-第二章玉米秸秆还田机的工作原理及总体结构设计.........................-4-2.1传动方案的确定：........................................................-4-2.2秸秆还田机的总体方案设计图：............................................-4-2.3锤爪式刀片的选择：......................................................-5-2.3.1刀片的材料选择及其热处理：........................................-5-2.3.2刀片的排列方式：..................................................-5-2.3.3刀片结构简图：....................................................-6-第三章还田机结构设计及相关计算.......................................-7-3.1拖拉机选型..............................................................-7-3.2主要工作部件设计计算....................................................-9-3.2.1传动比分配：......................................................-9-3.2.2功率分配.........................................................-10-3.2.3转矩计算.........................................................-10-3.3锥齿轮的设计计算.......................................................-10-3.3.1齿面接触疲劳强度计算：...........................................-10-3.3.2分度圆直径的确定：...............................................-11-3.3.3确定传动主要尺寸.................................................-12-3.3.4齿根弯曲疲劳强度计算.............................................-12-3.4箱体的设计.............................................................-13-3.5皮带轮的设计计算.......................................................-14-3.5.1定V带型号和带轮直径.............................................-14-3.5.2计算带长.........................................................-14-3.5.3求中心距和包角...................................................-15-3.5.4求带根数.........................................................-15-3.5.5求轴上载荷.......................................................-15-3.5.6带轮.............................................................-15-3.6主动轮轴的设计计算.....................................................-16-3.6.1初步确定最小直径.................................................-16-锤片式玉米秸秆粉碎还田机机械结构的设计II3.6.2拟定轴的装配方案.................................................-16-3.6.3轴上零件的周向定位...............................................-17-3.6.4确定轴上圆角、倒角尺寸...........................................-17-3.6.5轴的强度校核.....................................................-17-3.7从动轮轴的设计.........................................................-20-3.7.1计算最小直径.....................................................-20-3.7.2拟定轴的装配方案：...............................................-21-3.7.3轴上零件的周向定位...............................................-21-3.7.4确定轴上圆角、倒角尺寸...........................................-21-3.7.5轴的强度校核.....................................................-21-3.8刀轴的设计.............................................................-25-3.8.1初步确定轴的最小直径.............................................-25-3.8.2刀轴的校核.......................................................-26-第四章总结与心得体会................................................-30-参考文献.............................................................-31-致谢................................................................-32-锤片式玉米秸秆还田机机械结构设计摘要保护性耕作技术是全球农业技术发展的必然趋势，秸秆还田技术是机械化保护性耕作中的一项关键技术。在农忙期间，使用机械化的秸秆还田技术可以使耕作的更为高效化，同时有力推动机械化还田技术可以避免由于秸秆焚烧而带来的一系列环境污染。本文所研制的秸秆还田机功率消耗小，粉碎率高，适合小规模的秸秆粉碎还田。在对秸秆粉碎还田基本理论分析的基础上，得出了玉米秸秆还田机总体结构设计方力经万向节传递给变速箱，变速箱一轴经齿轮、带轮两级增速后，带动粉碎刀辊工作，粉碎刀辊带动刀轴进行秸秆粉碎达到秸秆粉碎还田的目的。关键词：保护性耕作；灭茬；秸秆还田机；碎茬刀ThedesignofCounters-fieldsetdeviceABSTRACTConservationtillagetechnologyistheglobaldevelopmenttrendofagriculturaltechnologies,Thesmashedstrawtechnologyisoneessentialtechnologyofthemechanizedprotectioncultivation,theuseofstrawmechanizationoffarmingcanbemoreefficientwhilestrongimpetustothemechanizationtofieldstoavoidburningthestrawbroughtaboutaseriesofenvironmentalpollution,thispaperdevelopedthepowerconsumptionofasmallstrawmachine,crushingrate,suitableforsmashedcrushedstraw.designplanofmulti-functionmachinewasintroduced.Themachineismainlycomposedofsystemgearboxmissionsystemstalk-soilreturningroller,rotarytillerroller,anddepthlimitroller.Poweristransmittedfromthetractorshafttothepoweroutputgearbox.Oneshaftofthegearboxisacceleratedbybothbevelgearsandstraptransmission.Andthenitdrivesthestalk—smashingknivesrevolvingquickly.Anotherismovedbythebevelgearsandstrapwheeltodrivetherotarytillerworking.Crushingkniferollerdrivetheknifeshafttostrawcrushingstrawcrushingreturning.Keywords：Conservationtillage,stubble,Thestrawreturnedmachine,Roundknife绪论-1-第一章绪论1.1玉米在我国的分布概况我国是世界上第二号玉米生产大国，年产量亿余吨，占世界总产量的20%;同时，我国也是玉米的头号消费大国，消费量的90%以上靠国内生产。中国的