机械毕业设计371半喂入小型联合收割机之割台部分

1本科毕业论文（设计）题目：半喂入小型联合收割机之割台部分学院：工学院姓名：学号：专业：班级：指导教师：二014年5月2目录中文摘要英文摘要1绪论.................................................................11.1国内收获机械发展概况...........................................................................................61.1.1入门阶段....................................................61.1.2发展阶段....................................................11.1.3利用引进技术发展阶段........................................11.2国外收获机械发展概况.......................................................................................................21.3本次设计过程.........................................................................................................................22收割台机构...........................................................32.1割台机构的选择..........................................................32.2输送带式卧式割台的结构..................................................32.3输送带式卧式割台的工作流程.............................错误!未定义书签。3往复式切割器.........................................................43.1往复式切割器的构造及类型...............................................43.1.1Ⅱ型往复式切割器的构造..........................................43.1.1.1动刀片...................................................43.1.1.2定刀片...................................................43.1.1.3护刃器...................................................43.1.1.4压刃器...................................................43.1.1.5摩擦片...................................................43.2切割器运动学............................................................43.2.1割刀驱动机构................................................53.2.2割刀的位移、速度和加速度....................................63.2.3选择割刀平均速度，计算曲柄转速..............................63.2.4曲柄转速与机器前进速度的关系................................63.2.5临界切割速度比..............................................63.3切割机构动力学.........................................................73.3.1割刀在工作时的受力分析......................................73.3.2切割器的惯性力平衡..........................................83.3.3切割器消耗功率..............................................93.4割刀的安装及调整........................................................94拨禾轮..............................................................104.1拨禾轮的选择...........................................................104.2偏心拨禾轮的运动轨迹..................................................104.3拨禾轮的速度比.........................................................114.4拨禾轮的设计参数.......................................................124.4.1拨禾轮安装高度及其调节范围.................................124.4.2拨禾轮直径D的确定.........................................134.4.3拨禾量ΔX与拨禾轮的作用程度η..............错误!未定义书签。4.4.4拨禾轮的转速...............................................154.4.5拨禾轮功率N的损耗.........................................1534.4.6拨禾轮的调整...............................................165割台升降装置的设计..................................................165.1割台升降机构型式的选用................................................165.1.1液压式割台升降机构的结构...................................165.2割台悬挂机构运动学....................................................165.3油泵的选择..............................................................175.4油缸的设计和计算.......................................................175.4.1油缸种类的选择.............................................175.4.2油缸的计算.................................................175.4.3割台升降液压传动系统的设计.................................206横向输送机构........................................................216.1输送链的选择...........................................................216.2直立附板滚子链的参数..................................................216.3链轮的参数..............................................................22参考文献...............................................错误!未定义书签。致谢...................................................错误!未定义书签。4摘要半喂入联合收割机是采用偏心拨禾轮的，其能够扶起倒伏度较大作物，夹持作物使其半喂入脱粒，处理量明显减少而且稳定，不会由于倒伏程度的不同和作物湿度而有很大变化。其作业性能优良，且能使作物整齐铺放或者切碎还田。从20世纪90年代中期以来，由于结构尺寸放大，多种监控、自动控制装置的使用，多数机型作业速度可达1.22~1.5m/s,工作幅度1.45~1.98m，个别的达到2.1m，配置动力33.5、55.9、61.0kw机器接地压力在20kpa以上，防陷性能高，生产效率0.2~0.47hm2/h或以上。其主要问题是机型过大后灵活性变差且售价过高。因此本设计旨在克服上述缺点，设计一款适合南方丘陵地区，价格合理的小型半喂入联合收割机。该设计的主要内容在于：切割器、偏心拨禾轮、割台的升降控制机构等重要部件的设计研究。关键词：半喂入；联合收割机；割台；切割器；偏心拨禾轮；割台升降控制机构。5AbstractAsasemi-feedingcombineharvestereccentricreel,canliftupthelodgingofthelargercrop,significantlyreducedandstablegrippingsemi-fedcropthreshing,processingcapacity,notbecauseoflodgingandcropmoisturelevelsandhavedifferentgreatchanges.Jobperformance,butalsomakeneatplacementorchoppedcropfarmland.Sincethemid-1990s,asareferencetothesizeoftheenlargedstructure,avarietyofmonitoring,automaticcontroldevice,theoperatingspeedofmostmodelsupto1.22~1.5m/s,theworkrateof1.45~1.98m,theindividualreaches2.1mconfiguredynamic33.5,55.9,61.0kwmachinegroundpressure20kpaabove,anti-depressionhighperformance,productivity0.2~0.47hm2/hormore,themainproblemistoolargemodelsandpricesdeterioratedafterhighflexibility.Therefore,thisisdesignedtoovercometheseshortcomingsofrequirements,designasuitableSouthernHills,affordablesmallsemi-feedingcombineharvester.Themaincontentsofthedesignare:cutter,eccentricdialdesignresearchimportan