题目：20/5吨双梁桥式起重机
目录
内容摘要……………………………………………………………………………1
关 键 词……………………………………………………………………………1
Abstract……………………………………………………………………………1
Key  words…………………………………………………………………………1
绪  论………………………………………………………………………………2
1.主起升机构计算…………………………………………………………………3
1.1钢丝绳选择…………………………………………………………………3
1.2卷筒设计……………………………………………………………………3
1.3起升电机选择………………………………………………………………5
1.4减速器选择…………………………………………………………………5
1.5制动器选择…………………………………………………………………6
2. 副起升机构计算…………………………………………………………………7
2.1钢丝绳选择…………………………………………………………………7
2.2卷筒设计……………………………………………………………………8
2.3起升电机选择………………………………………………………………9
2.4减速器选择…………………………………………………………………9
2.5制动器选择…………………………………………………………………10
3．小车运行机构计算………………………………………………………………10
3.1运行阻力……………………………………………………………………11
3.2选择电动机…………………………………………………………………12
3.3确定减速器…………………………………………………………………12
4．大车运行机构计算………………………………………………………………13
4.1轮压计算……………………………………………………………………13
4.2电机选择……………………………………………………………………14
4.3确定减速器…………………………………………………………………15
5．主梁设计………………………………………………………………………… 16
5.1选择主梁……………………………………………………………………16
5.2主梁载荷计算………………………………………………………………18
5.3起升载荷及其最大弯矩计算………………………………………………18
5.4水平惯性载荷………………………………………………………………20
5.5载荷组合与主梁应力计算…………………………………………………20
5.6刚度计算……………………………………………………………………22
6.端梁计算…………………………………………………………………………23
6.1中间断面系数计算…………………………………………………………23
6.2端部支承处断面系数计算…………………………………………………24
7.整车总功率………………………………………………………………………25
   7.1整车电机功率之和…………………………………………………………25
总结语………………………………………………………………………………26
参考文献……………………………………………………………………………27
内容摘要：桥式起重机主要由起升机构、小车运行机构、小车架和一些安全防护措施组成，桥架横跨车间两侧的轨道上，小车在桥架横梁上的轨道上沿着横梁运动，吊钩可到达车间的每一个角落，实现物体的提升和平移。桥式起重机，具有适应范围广，提升重量范围大，操作简单，安装拆卸方便等优点，广泛用于工厂生产和港口物流搬运中。机械部分主要由小车架、卷筒、吊钩、桥架横梁和操纵室等构成。
桥式起重机可实现升降、平移两种工作模式，本设计中根据起重量、起升速度和运行速度计算出电机功率、减速器、卷筒及各联轴器型号，并以此依据来选型，综合考虑多方面的因素，根据桥式起重机工作环境设计了起重机的安全保护措施等；同时各个系统有相应的安全保护措施来保证起重机安全可靠运行。
关键词：桥式起重机   车间   起重机   机械部分
Abstract： Bridge crane hoisting mechanism, cars run by institutions, mainly composed of small frame and some security measures, on a bridge across the shop floor on either side of the track, trolley tracks along the beam movement on the bridge beams, crane to reach every corner of the shop, improving the realization of objects of peace moves. Bridge cranes, has to adapt to a wide range and large range of lifting weights, simple operation, easy installation and removal, and other advantages, widely used in factories and ports for transport. 　Mechanical parts, mainly by small frame, reel, hook, form of bridge beams and cabinets.
Bridge type crane can implementation lifting, and pan two species work mode, this design in the under up weight, and up rose speed and run speed calculation out motor power, and reducer, and reel and the all coupling model, and to this pursuant to to selection, integrated considered many of factors, under bridge type crane work environment design has crane of security protection measures. At the same time the system has the appropriate security measures to ensure the safe and reliable operation of a crane.
Key Words：Bridge type hoist   shop   crane   The mechanical part