三个科目搜酷.doc

三个科目搜酷.doc三个科目搜酷13483510189275T/50桥式起重机电气控制设计275T/50桥式起重机电气控制设计【发布时间:2010-03-3102:07:46】来源:作者:【大中小】浏览:557次275T/50桥式起重机电气控制设计摘要桥式起重机是桥架在高架轨道上运行的一种桥架型起重机,又称天车。桥式起重机的桥架沿铺设在两侧高架上的轨道纵向运行,起重小车沿铺设在桥架上的轨道横向运行,构成一矩形的工作范围,就可以充分利用桥架下面的空间吊运物料,不受地面设备的阻碍。桥式起重机广泛地应用在室内外仓库、厂房、码头和露天贮料场等处。桥式起重机可分为普通桥式起重机、简易粱桥式起重机和冶金专用桥式起重机三种。普通桥式起重机一般由起重小车、桥架运行机构、桥架金属结构组成。起重小车又由起升机构、小车运行机构和小车架三部分组成。起升机构包括电动机、制动器、减速器、卷筒和滑轮组。电动机通过减速器,带动卷筒转动,使钢丝绳绕上卷筒或从卷筒放下,以升降重物。本文重点研究起重机的控制,通过使用串电阻的调速方法已实现对电机的控制,从而控制起重机。关键词:起重小车;电动机;串电阻调速275T/50bridgecraneelectricalcontroldesignABSTRACTBridgecraneisabridgeinanelevatedrunningtrackasabridge-typecrane,alsoknownasCrane。Bridgecraneinstalledinthebridgealongthetrackonbothsidesoftheelevatedverticalrun,Liftingtrolleyalongthebridgeonthelayingofthetrackinthehorizontalrun,whichconstitutethescopeofworkofarectangle,youcantakefulladvantageofthespacebridgewasbeingliftedthefollowingmaterials,,factories,docksandoutdoorstorageyard,,,includingthemotor,brake,reducer,drumandpulleyblocks。Carliftingandliftingbytheagencies,,includingthemotor,brake,reducer,,drivenrotatingdrumsothatthewireropearoundthedrumorfromthereeldowntotake-offandlandingweight