电气自动化论文编号:ZD076    字数:5356,页数:25  

目  录
一选定课题....................................................................5
1.1 机床用途 ................................................................. 5
1.2 具体功能要求...............................................................5
1.3 设计过程.................................................................  5
二  方案论证 ................................................................. 6
2.1选定方案 ................................................................. .6
2.2 PLC简介 .................................................................. 6
三设计方法..................................................................  8
3.1 主电路的设计...............................................................8
3.2 输送带电路的设计...........................................................8
3.3 控制电路的设计............................................................ 8
四系统分析 ................................................................. .9
4.1 砂光机驱动电路图.......................................................... 9
4.2 控制系统的组成及相互关系.................................................. 9
4.2 控制电路（PLC的连接） ....................................................10
4.3  PLC的I/O分配 ..........................................................11
4.4 梯形图设计(见附录) .......................................................12
五  各控制环节的作用与实现 ...................................................13
5.1 主砂电机的启动与运行......................................................13
5.2 自动运行的条件.........................................................13
5.3输送带自动运行和无级调速的实现............................................13
5.4 砂光带的自动运行过程....................................................14
5.4.1 防止砂带误动作.......................................................14
5.4.2 延时释放............................................................14
5.4.3 防伤料控制..........................................................14
5.4.4　涨紧控制............................................................15
5.4.5 砂带涨紧检测.........................................................15
5.4.6砂带运行..............................................................15
5.4.7 砂带的对中控制过程 ...................................................16
5.4.8 刷光自动运行..........................................................16
5.4.9 砂带清扫运行 ........................................................16
5.5 工作台的上升与下降控制 ..................................................17
5.5.1 挡位转换 ............................................................17
5.5.2 上升  ..............................................................17
5.5.3 下降 ................................................................17
5.5.4 自动下降 .............................................................18
5.5.5 故障  ................................................................18
5.6 砂光垫振动  ............................................................18
5.7 节电功能 ................................................................18
5.8 声光报警................................................................19
致谢 .......................................................................21
七附录:梯形图............................................................... 22

【摘  要】本文阐述了应用三菱公司生产的具有高性能价格比的微型可编程控制器FX2N-48MR系列PLC为系统的主控单元,控制交流三相异步电动机，输送带无级调速采用“三菱”MISUBSHI变频驱动器及变频电机来实现。
该系统充分利用了培训中讲述的可编程控制器（PLC）的多方面设计知识和方法，使得该系统可靠稳定，使其应用范围得到扩展。

【关键词】  可编程控制器  PLC  通用砂光机控制系统

Abstract
“(PLC) the procedure designer the professional manager authentication test practiced link's graduation design as the CETTIC nation programmable controller”, this article elaborated produced had the high performance price compared to miniature programmable controller FX2N-48MR using the Mitsubishi Corporation series PLC is system's master control unit, the control exchange three-phase asynchronous motor, the conveyor belt stepless speed regulation use “Mitsubishi” the MISUBSHI frequency conversion driver and the frequency conversion electrical machinery realizes. This system has used the programmable controller which fully in training narrated (PLC) various design knowledge and the method, cause this system reliably stable, enables its application scope to obtain the expansion.

key word: Programmable controller PLC general sander control system