西南交通大学本科毕业设计（论文）外文资料及翻译年级:2007级学号:20077657姓名:王雪扬专业:工程机械指导老师:李春林2011年5月1第2页共17页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第2页共17页LoadingmachinesFormaterialshandinginconstruction,useismadeofloaders.Practicehasshownthatexcavatorsarelesseffectiveinthecapacityofloadsinquarriesandstoragesofnonmetallicmaterialsthanloaders.Bythekindofloadshandled,loadersareclassifiedasforkliftloadsandscoopingloadersforloosematerials.Soopingloadersaredividedintosingle-bucketandcontinuous-actionMulti-bucketloaders.Single-bucketloadersaregeneral-purposemachinessuitedengineeringandinapplicationsrequringcontinuousworkingprocess.Dependingonthekindofrunninggear,crawlerandanailable.Crawlerloadershaveahighpassblibityanddevelopagreatthrustefftort.Wheeledloadersfeatureahighmanoeuvrabilityandhightravelingspeedsmakingnodamagetotheroadpavementandthestorageareas.Unloadersareusedforunloadingsand,gravel,crushedstone,cementformrailwaycars.Powerandpneumaticunloadersareused,powerforunloadingmaterialsfromflatcarsorgondolacars(openwagons)andpneumaticforunloadingcement.Themainworkingmemberoffork-liftloadersistheforkservingtoloadandunloadpieceloads.Theseloadershavedifferentchangeattachments.Whenequippedwithbucketsorgrabs,theyareusedfor第3页共17页第2页共17页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第3页共17页loadinglooseandsmall-piecematerials,andtheboomattachmentmakestheseloaderssuitedforhoistingloadstoasmallheigheandsometimesforerectionworkinconstruction.Fork-liftloadersareoperatedonhard-pavementareas,thereforetheyaremainlyusedinstorehouseandasfactorymaterials-handingequipment.Theyaremadeonthebasisofatruckthereforetheyarealsocalledtruckloaders.theyarepoweredbyinternalcombustionenginesorelectricmotorswithstoragebatteries.Enginepoweredtruckareusedforlargewarehouseandstock-handingapplication,forgeneralyardworkandfprloadingandunloadingofvehicles.Torqueconvertertransmissionprovidessmoothoperation;powersteeringandall-weathercabsareoptionsavailable.Single-bucketloadershaveacrawlertractororawheeledtruckasacarriermounting.Theloaderpermitsmechanizationofloadingconstructionanderectionandworkwiththeaidofchangeattachments,ofwhichthemainoneisthebucket.Theloadingequipmentisavailableinthreemodifications:front-end,overloading,andhalf-swing,jib-type.Thefront-endattachmentprovidesalsosideunloading.Theoverloadingmodifiactaionpermitsbackunloading.Presentlyfront-endloaderwiththepositivedisplacementhydraulicdrivesfortheattachmentaremostwidelyused.第4页共17页第3页共17页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第4页共17页Theoutputofmulti-bucketloadersis40to60percenthigherthanofsingle-bucketmachinesatthesamepowerrating,itisexpedienttousetheminbrickyards,prefabricatedconcreteproductsplants,railwaystationswithlargevolumesofloading-unloadingoperatinsandalsoforloadingloosematerials.Inaddition,theyaresuitedforsizegradingofloosematerials,forwhichpurposetheyareprovidedwithspecialvibratingscreens.Multi-bucketloadersareveryefficientinunloadingflatcarswithsidedumpingofthehandlematerial.Theseloaderscanbeappliedintheproductionlinesofprefabricatdeainstructionproductsplantsandalsoinroadbuilding.Inthelattercasetheyareusedforloadingsandandgravelintodryingdrumsandmixers.Theworkingmemberoftheloaderisascrewfeederconsistingoftowright-handandleft-handscr...
