文档介绍：课题: 20/5t桥式起重机控制线路设计
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摘要
20/5t桥式起重机是一种用来吊起或放下重物并使重物在水平距离内水平移动的起重设备。主要由桥架.,大车运行机构,小车运行机构,起升机构和电气设备组成。起重机广泛用于工矿企业,车站,港口,仓库和建筑工地等场合,是完成各种繁重吊运任务,减轻劳动强度,提高劳动生产率和促进生产过程机械化的重要设备之一。本课题所设计的控制电路分为电源电路,副钩,小车。大车,电动机的主电路,保护电路和主钩电动机电路。本文简要地介绍了起重机的性能、结构、发展状况等,并参照《起重机设计规范》(GB3811-83)及《起重机设计手册》对起重机起升机构及其零部件进行设计计算,从方案论证到具体设计计算,充分发挥了计算机在整体设计中的作用,从而提高了设计质量、缩短了设计周期,提高了工作效率。
ABSTRACT
     With fast developments of the modern technology, the expansion of industrial production and the growth of the automatic level, applications of the carnes in the modern manufacture has been more and more extensive, the effect has been bigger and bigger. Higher and higher requirement has been caused. Especially, with the broad application puter technology and the appearance of the advanced design method of a lot of interdiscipline, which urge the technology of the carne into a brand-new seedtime.
      This carne is a kind of 250/50/10t bridge carnes for hydropower station, builded in the workshop of Fengman hydropower station for the extend project. It is used to install, examine and repair of sets of water-turbine generator. This paper focuses on design of hoisting mechanism of the carne, including the main and assistant hoisting mechanism with electromotors, reducers, brake staffs, drum devices and pulley gears. The carne is required to be stables, high accuracy, safety, reliability and advanced technology.
      This text briefly introduce the carne’s capability, structure, the actuality of development, and so on, referring to “Design criterion of carne”(GB3811-83) and design and calculate of the hoisting mechanism and its accessory in “Design handbook of carne”. From scheme demonstrating to designing and calculating, it takes full advantage of puter in the whole design to raise the quality of the design, cut the cycle of the design, improve the work efficiency.
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第一章20/5t桥式起重机常用电器,电机及选用