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汽车起重机变幅系统设计汽车起重机变幅系统设计摘要随着经济建设的飞速发展，我国的基础建设力度正逐渐加大，道路交通，机场，港口，水利水电，市政建设等基础设施的建设规模也越来越大，市场上汽车起重机的需求也随之增加。汽车起重机变幅系统设计主要是变幅机构三铰点的确定和变幅油缸尺寸的设计和计算以及其它辅助元件的选取。合理的确定变幅机构三铰点对汽车起重机的整体设计非常的关键，它影响汽车起重机的吊臂和转台的机构形式以及液压缸的参数选择，对汽车起重机的稳定性也至关重要。本文主要通过作图与计算相结合的方式寻找铰点最佳的位置，选取最佳铰点方案。变幅油缸的设计主要是依照《新编液压工程手册》和参考中联重科35吨汽车起重机的变幅油缸。关键词：35吨汽车起重机；变幅机构三铰点；变幅机构；变幅油缸汽车起重机变幅系统设计TruckTruckTruckTruckCraneCraneCraneCraneSystemSystemSystemSystemAbstractAbstractAbstractAbstractWiththerapiddevelopmentofeconomicconstruction,Chinaisgraduallyincreasingtheintensityofinfrastructure,roadtransport,airports,ports,waterutilities,municipalconstructionandotherinfrastructurearebecomingeverlarger,themarketdemandforcarswithcranestheincrease.TruckCraneluffingsystemismainlythreenodesofthecylindersizeandamplitudetodeterminethedesignandcalculation,andotherauxiliarycomponentsselected.Reasonabletodetermineluffingcranethreenodesonthecar'soveralldesignisthekey,itaffectsthetruckcraneboomandturntablebodyformandparametersofhydrauliccylinderonthecrane'sstabilityiscrucial.Inthispaper,drawingandcalculationbycombiningthebestwaytofindthelocationofhingepoints,selectthebestprogramhingepoint.LuffingcylinderdesignismainlyinaccordancewiththeNewHydraulicEngineeringHandbookandthereferenceZoomlion35tonstruckcraneluffingcylinder.KeyKeyKeyKeywordswordswordswords：35tonstruckcrane；Luffingthreenodes；Luffing；Luffingcylinder汽车起重机变幅系统设计目录1.绪论..............................................................................................................................................11.1课题背景及目的...............................................................................................................11.2国内外研究状况..............................................................................................................11.2.1国内汽车起重机发展趋势...................................................................................11.2.2国外汽车起重机发展趋势...................................................................................21.3课题研究方法..................................................................................................................42.液变幅系统方案确定.................................................................................................................52.1变幅机构布置形式确定..................................................................................................52.2变幅机构液压回路方案确定.........................................................................................53.变幅机构三铰点确定.................................................................................................................73.1变幅机构受力分析..........................................................................................................73.2变幅机构三铰点合理几何形状的分析.........................................................................83.3变幅机构三铰点几何三角形的确定............................................................................114.变幅油缸的设计与计算...........................................................................................................124.1变幅油缸推力计算........................................................................................................124.2变幅油缸性能参数的确定...........................................................................................134.2.1变幅油缸压力的选取.........................................................................................134.2.2变幅油缸缸径D的确定.....................................................................................144.2.3变幅油缸负载率的计算.....................................................................................144.2.4变幅油缸活塞杆直径d确定.............................................................................154.2.5活塞杆理论拉力和推力计算.............................................................................154.2.6变幅油缸活塞杆行程确定.................................................................................164.2.7变幅系统液压泵流量确定.................................................................................165.液压缸主要零部件设计...........................................................................................................185.1液压缸缸筒....................................................................................................................185.1.1液压缸筒与端盖的连接....................................................................................185.1.2缸筒壁厚的计算..................................................................................................18汽车起重机变幅系统设计5.1.3缸壁厚度的验算..................................................................................................205.1.4缸筒底部厚度的计算.........................................................................................215.1.5缸筒加工要求......................................................................................................225.2活塞的设计计算............................................................................................................225.2.1活塞的结构形式..................................................................................................225.2.2活塞的密封..............................................