毕业设计（论文）-plc推钢机控制系统设计

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1、天津冶金职业技术学院毕业设计推钢机技术系别电气工程系专业生产过程自动化班级过控08-1班学生姓名指导教师2011年4月20日31目录摘要······························································Ⅲ前言······························································Ⅳ第一章推钢机的简介················································11.1推钢机的种类························

2、························11.2推钢机结构特点及工作原理····································11.3设计中应注意的几点事项······································21.3.1推力的计算·············································21.3.2齿轮的选择·············································21.3.3推杆的结构···································

3、··········31.3.4推钢速度·························31······················31.3.5推钢机行程·············································31.4推钢机未来发展趋势··········································3第二章电机电气控制、启动方式和线路保护····························42.1电气控制图··················································

4、42.2异步电动机降压启动线路·····································112.2.1定子电路串电阻降压启动···································122.2.2串自耦变压器降压启动控制线路··························122.2.3自耦变压器降压起动控制电路·······························132.3停车····················································142.4线路保护环节··············

5、·································142.4.1短路保护···························31···················142.4.2过载保护··············································142.4.3欠压和失压保护········································15第三章液压系统·····································163.1什么是液压系统··························

6、················163.2液压系统的结构··········································163.3液压系统对液压油的基本要求······························163.4液压系统的保养··········································16第四章PLC及现场总线··············································184.1PLC基本概念············································

7、···184.2PLC的定义··················································18314.3PLC的分类··················································184.3.1小型PLC···············································184.3.2中型PLC··············································184.3.3大型PLC······················