橡胶弹簧构造、功能PPT课件

MarshMellowIntroduction,ConstructionandFunction橡胶弹簧介绍、构造以及功能,WhatisaMarshMellow?橡胶弹簧是什么？Rubbercylinder橡胶柱Fabricreinforced纤维加固CompressionSpring压缩弹簧VibrationIsolator隔振器,Description描述,Developedin1973开发于1973年Lookingfora“spring”withsimilarcharacteristicstoanairspring,butwithoutrequiringair需求是：性能类似于空气弹簧但是不需要压缩空气WhythenameMarshMellow?为什么叫MarshMellowDevelopedbyFirestoneengineer,JerryMarsh开发者是凡士通工程师，JerryMarsh,History历史,Uniqueelementsofdesignflexibility特殊的组成Solidrubbercorematerial实心橡胶芯Hollowcenter中空中心Endconfiguration端面形状可选Fabricreinforcedplies纤维增强层,Construction构造,ReviewSample,Applicationdependent基于应用VibrationIsolationCompound(allcatalogpartsarethishighefficiencycompound)隔振器配方（手册中所有产品都是这种高效的配方）Highefficiency高效Provideslittledamping仅提供很小的阻尼ShockAbsorptionCompound冲击吸收配方Higherdamping高阻尼Reduces“springback”effect降低回弹效应,SolidRubberCoreMaterial实心橡胶材质,Construction构造,VariableofLoadCapacity可提供不同的载荷能力Affectscontactarea影响接触面积SmallerIDcarrieslargerload中心直径越小，载荷能力越强Aidsininstallation安装指南“Installation”p.2426inCatalog产品样本第24-26页Mountingpins安装销Centerrod中心杆Cable张紧带,Construction构造,HollowCenter中空中心,MountingMethod安装方法,ApinneedstobesuppliedbythecustomerontheirmountingplatetofitintothehollowcenteroftheMarshMellow.Thedetailsaresuppliedoneachdatapageofthecatalog.客户需要在安装板上提供一个销子，插入到橡胶弹簧的中心孔，详细信息请见数据样本。AlsotheplateneedstobeatleastaslargeindiameterasthemaximumdiameteroftheMarshMellow.安装板直径不得小于橡胶弹簧的最大直径。,MountingMethod安装方法,Example:W223580176,Notaperisthestandard标准形式是非锥面形状的。Taperadvantages锥面形状端面的优势Softeratlowcompression低压缩时更软Reducedstressinarcmotions弧形运动时可以降低应力Improvedfabricperformancefortall,thinparts用于又高又长的产品时，可以提高纤维层的性能,Construction构造,EndConfiguration端面形状选择,Hightensiletirecordfabric高强度轮胎纤维Angledpliesprovide层与层之间纤维成角度排列Consistentcylindricalshape（被压缩时）保持圆柱形状Loadcurveprofile载荷曲线Stability稳定性Similartoanairspring与空气弹簧相似,FabricConstruction纤维层结构,Construction构造,SimilarconcepttoanAirSpring与空气弹簧理念相似,Construction构造,MarshMellowOperation橡胶弹簧应用,Whenrubberisdeformed,itflowstothepathofleastresistancelikeafluid.像流体一样，橡胶被压缩时会遵循最小阻力原则。Itformsaspherewithflatends.那样会形成一个两端是平面的球形Theloadiscarriedlikeacylinder,pressuretimesarea载荷能力计算类似气缸，压力乘以面积However,theareaisonlythesizeofthecontactareaoftherubberandmetalends然而，面积只是橡胶与金属件的接触面积,PerformanceCharacteristics性能,AstheheightdecreasesinaMarshMellow,thecordspantograph,increasingdiameteratthesamevolumetricrate.橡胶弹簧被压缩时，纤维平行移动，使得其直径相应增长，但容积不变。Internalpressureisappliedovertheentirevolumesincethecontactareaincreasesaswell由于接触面积随之增大，内部压强会作用于整个橡胶弹簧。,PerformanceCharacteristics性能,MarshMellowsmaintainacylindricalshape橡胶弹簧保持圆柱形状,PerformanceCharacteristics特性,NoLoad(0kg)零载荷Height=57cm高度,PerformanceCharacteristics特性,22,5tons载荷Height=38cm高度,PerformanceCharacteristics特性,45tonsHeight=33cmLoadincreasesby100%Deflectionincreasesby13%,PerformanceCharacteristics,PerformanceCharacteristics特性,Precautions&Advantages注意事项以及优势,ChemicalResistanceChart化学物质耐受性,FormoreinformationyoucanlogintotheDuPontwebsiteforamuchmoreextensivelist.更多信息，请登录杜邦公司网站：,Potentialdamage潜在破坏,Ifthepindiameteristoolargeitcancausetearingoftherubbercore.如果安装销直径过大，有可能切坏橡胶芯IfthepindiameteristoosmallitcanallowtheparttoshiftsidewaysanddamagetheID如果安装销直径过小，有可能导致橡胶弹簧水平移动，从而导致内壁损坏IfthepinistoolongitwillgougetheIDofthepartwhencompressedduringlateralvibrations.如果安装销过长，它可能啃坏橡胶弹簧内孔壁Ifthepinistooshortthepartcanjumpoffduringoperationanddamagetheendofthecore如果安装销过短，运行过程中，橡胶弹簧可能跳出销子，从而导致端面损坏ThemountingplatediameterneedstobelargerthanthelargestdiameteroftheMarshMellowunderfullcompression安装板的直径需要大于橡胶弹簧的最大压缩时的最大直径。,Workingcompression15to27.5%-Why?压缩率15-27.5%，为什么？Needminimumcompressionof15%toinsurethatthemachinewillnotbounceoffofthemountingpinsduringstartuporshutdown.最低压缩率15%以保证安装销在启动、停机过程中不至于跳出橡胶弹簧。Also,minimumof15%inordertogetintoabetterisolationrangeduetonaturalfrequency15%的最低压缩率还保证了较好的隔振率Maximumof27.5%inordertokeeprubbertemperatureundercontrolinnormalworkingconditions最高压缩率27.5%确保正常运行过程中橡胶弹簧的温度不至于超高Maximum40%deflectionWhy?最大变形40%Althoughyoushouldnotoperatethepartdynamicallyatabove27.5%deflection,itcantakeimpactloadsupto40%虽然不应使橡胶弹簧的动态压缩率超过27.5%，但是橡胶弹簧可以承受40%压缩率的冲击。Above40%compressiontherubbercanfractureandthefabricplysfail超过40%的压缩率时，橡胶可能会破裂，纤维层可能会失效。,LoadRange载荷范围,LateralStaticDeflection横向位移,AlthoughMMcanmovelaterallyonadynamicbasis,youshouldkeepthemverticalstaticallyascloseasyoucan.即使橡胶弹簧可以在动态情况下允许横向移动，但在静态情况下应尽可能得保证其垂直。,Vertical/Lateraldynamicmotion垂直方向运动Mostvibratingequipmentmovesinthreedimensionswithtwodimensionsbeingdominant.(seetheovalpatternatright).多数振动设备有3个方向的振动但是以2个方向为主（见右图）,Stroke/Deflection行程/变形,Equipmentstroke设备行程,Advantagesvs.CoilandRubberSprings与螺旋弹簧及橡胶块对比的优势,Comparedtoasteelspring:对比钢质弹簧Corrosionresistance耐腐蚀寿命长Quieter安静Improvedoverloadcondition改善超载运行状态Improvedfailuremode优化的失效模式零载荷高度低,易于安装有冲击时高度变化小Betterlateralisolation更好的横向隔振性能,Comparedtoasolidrubbermount:对比于橡胶块弹簧寿命长Betterisolation隔振效果好Largerloadcapacity/diameter载荷能力大Betterlateralstability横向稳定性好Improvedfailuremode优化的失效模式,Whydoesthismattertoyou?其他特性,MobileVibratingScreen移动振动筛,MostVibratingScreenapplicationsareusedoutdoorsandoftenindamp,dirtyenvironments多数振动筛用于户外，且常见环境比较潮湿、脏乱。,Variablespringratemeansthatyou