PLC在冷阴极灯管生产线的设计应用

三江学院本科毕业设计（论文）课题名称PLC在冷阴极灯管生产线的设计应用电气工程系电气工程自动及其自动化专业学号Z04071013学生姓名房樱燕指导教师熊田忠起讫日期2008.02.25~2008.06.04工作地点实验楼L408I摘要目前，在冷阴极灯管（CCFL）生产线上，大多使用手工生产。由于冷阴极灯管细小且易碎，人工生产工作量大，导致生产效率低，同时也会产生生产质量上的问题。本文的目标是：采用西门子S7-300PLC对CCFL的后续生产工序进行自动化改造，以提高产品的生产效率。文中分析了CCFL后续的大致生产工艺。进行了生产线的硬件设计，包括PLC、SM输入/输出模块、MM420变频器及电机等部分。软件设计利用STEP-7编程，主要有变频器控制电机运转、机械手控制产品上线传送、功能检测、清洁、计数及移位、自动包装等六个部分。所有程序在S7-PLCSIM中仿真并下载至硬件进行调试。仿真和硬件调试的结果符合CCFL生产工艺要求，自动化程度大为提高，具有很好的应用价值。关键词：CCFL生产线；PLC；软件编程；仿真；调试IIAbstractAtpresent,owingtothethinnessandfragileness,theColdCathodeFluorescentLamp(CCFL)onassemblylinesmostlydependsonmanualworkwhichconsumesmuchlaborandresultsinlowproductionefficiencyandpoorproductquality.ThetargetofthispaperisthattheautomatedmodificationbyusingtheSiemensS7-300PLCintheCCFL’ssubsequentproductionprocesswillimprovetheefficiency.ThispaperanalyzedtheCCFL’ssubsequentproductionprocessanddesignedthehardwareoftheassemblylines,includingPLC,SMInput/OutputModule,MM420FrequencyConversionandMotor,etc..ThedesignofthesoftwareusedSTEP-7toprogram,includingsuchsixpartsasmotorcontrolbyfrequencyinverter,workpiece-supply-manipulatorcontrol,functionalcheck,cleaning,countingandtransfer,automaticpacking.AlltheprogramsweresimulatedinS7-PLCSIMandloadeddowntothehardwaretodebug.TheresultofthesimulationandthehardwaredebuggingmatchedthedemandoftheCCEF’sproductionprocessandbroughtgreatimprovementintheautomatization,showingthatthedesignhadgreatvalueontheapplication.Keywords：CCFLassemblyline；PLC；softwareprogram；simulation；debugIII目录第一章绪论............................................................................................................................................-1-1.1课题的工程背景......................................................................................................................-1-1.1.1可编程序控制器（PLC）的诞生背景及意义............................................................-1-1.1.2冷阴极灯管（CCFL）的概念及现状..........................................................................-2-1.2目的及意义...............................................................................................................................-3-1.2.1课题的研究目的..........................................................................................................-3-1.2.2课题的研究意义..........................................................................................................-3-1.3论文的主要内容.......................................................................................................................-4-第二章CCFL’assly工艺过程分析.....................................................................................................-5-2.1CCFL的原理.............................................................................................................................-5-2.2CCFL’assly的大致生产过程.................................................................................................-5-2.2.1线材裁切........................................................................................................................-6-2.2.2线材组立......................................................................................................................-6-2.2.3灯管前置......................................................................................................................-6-2.2.4灯罩前置......................................................................................................................-6-2.2.5灯管焊接......................................................................................................................-6-2.2.6灯管组装......................................................................................................................-7-第三章控制系统硬件设计......................................................................................................................-8-3.1PLC类型的选择.......................................................................................................................-8-3.1.1西门子S7-300系列PLC的基本结构........................................................................-8-3.1.2PLC的物理组成部分.....................................................................................................-8-3.2变频器（MM420）及电机......................................................................................................-10-3.2.1MM420变频器的概况.................................................................................................-10-3.2.2MM420变频器的特点.................................................................................................-10-3.2.3MM420变频器的典型应用..........................................................................................-11-第四章控制系统软件设计....................................................................................................................-12-4.1STEP-7....................................................................................................................................-12-4.1.1STEP-7的概述...................................................................................................................-12-