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I学号：3040419234题目类型：设计(设计、论文、报告)桂林工学院GUILINUNIVERSITYOFTECHNOLOGY本科毕业设计(论文)题目：基于PLC的混凝土搅拌机控制及监控程序设计系(院)：电子与计算机系专业(方向)：自动化（控制）班级：自动化04-2班学生：指导教师：覃彦之2008年5月10日I基于PLC的混凝土搅拌站控制及监控程序设计摘要：混凝土搅拌站是随着水泥的诞生而产生和发展的。它是建筑、桥梁、道路、大坝等工程施工中的必备设备，它由贮料、配料、搅拌、放料等结构部件组成，是一个受多环节制约的复杂系统。而随着我国经济建设的高速发展，综合国力不断增强，国家对基础设施建设的投资力度加大，拉动了城市商品混凝土的高速发展，同时，使混凝土搅拌站有了较大的发展空间，最初搅拌站仅以单机的形式出现，混凝土自拌自用，随着基础设施建设大规模的开展，产生了很大的商品混凝土市场，搅拌站的需求越来越大，计量要求越来越高，于是出现了各种不同形式带有计量装置的搅拌站，从而产生了现代的混凝土搅拌站。常见的混凝土搅拌站控制方式有继电器直接控制、PLC和计算机结合以及PLC和配料控制器结合3种控制方式。采用PLC和配料控制器结合控制的搅拌站性能可靠、性价比高，可以保证混凝土的质量，提高混凝土生产效率。作为混凝土搅拌站的核心，控制及监控程序在计量精确、控制可靠、管理方便等方面的要求也日益提高。本文针对PLC和配料控制器结合控制的搅拌站来设计其控制及监控程序设计中主要要完成的任务有系统构造、PLC的I/O分配、工作流程图及PLC程序的编写。关键词:混凝土搅拌站；I/O分配；可编程控制器（PLC）；自动控制IIThedesigningofthecontrollingandmonitoringprogramforconcretemixingstationswhichbasedonPLCStudent:LICheng-haiTeacher:QINYan-zhiAbstract:Concretemixingstationswereproductedanddevelopedwiththebirthofcement.Itistheconstructionofthenecessaryequipmentforbuildings,bridges,roads,damsandotherprojects.It’sconstructedfromstoragematerials,ingredients,stirring,discharge,andotherstructuralcomponents,anditisasubjecttotheconstraintsofthecomplexmulti-linksystem.AsChina'seconomicconstructionandtherapiddevelopment,Comprehensivenationalstrengthconstantlyenhancethestate'sinfrastructureconstructioninvestmentincreasedtoboostthecity'srapiddevelopmentofready-mixedconcrete,sothattheconcretemixingstationshavelargerspacefordevelopment,theinitialMixingstationonlyintheformofstand-alone,self-mixconcrete-occupied,withtheconstructionofinfrastructurefacilitiesforlarge-scale,alotofready-mixedconcretemarketwasdeveloped,thedemandformixingstationsarelargerandlarger,andmeasuresareincreasinglydemanded,sothemixingstationswithvariousformsofmeasurementdevicesweredeveloped,therebythemodernconcretemixingstationwascreated.Commonconcretemixingstationscontrolwaysmaybethethreekinds:Relaydirectcontrol,PLCandcomputercombinationofingredientsandthePLCandcontrollercombination.ButPLCcontrollerandacombinationofingredientscontrolofthemixingstationisreliable,cost-effectiveandcanensurethequalityofconcrete,increasetheproductionefficiency.Asthecoreofconcretemixingstations,Thecontrollingandmonitoringprograminthemeasurementprecise,reliablecontrol,easymanagementandotheraspectsisincreasinglydemanded.ThispaperforPLCandthecombinationofingredientscontrollertocontrolthemixingstationwilldesignitscontrollingandmonitoringprogram.InthemaintextImustcompletasystematicstructure,theI/OdistributionofPLCandprepartheworkflowchartandPLCprogram.Keywords:concretemixingstation;theI/Odistribut-ion;programmablelogiccontroller(PLC);automaticcontrolIII目录1绪论..............................................................................................................................11.1选题背景及意义.........................................................................................................11.2混凝土搅拌机的现状及国内市场分析[1][2]...............................................................11.3本论文的主要工作.....................................................................................................21.3.1混凝土搅拌站系统硬件设计...............................................................................21.3.2混凝土搅拌站系统软件设计...............................................................................21.3.3程序的调试..........................................................................................................32混凝土搅拌站概述.........................................................................................................42.1混凝土搅拌站的组成.................................................................................................42.2电控系统的构成.........................................................................................................52.3传感器的选择.............................................................................................................82.4小结............................................................................................................................93混凝土搅拌站控制系统设计.......................................................................................103.1控制系统设计的基本原则及步骤[17].......................................................................103.2可编程控制器综述及其选用[16]...............................................................................113.2.1可编程控制器的特点...........................................................错误!未定义书签。3.2.2PLC的工作原理[15][16]........................................................错误!未定义书签。3.2.3可编程控制器的选用及组态软件选择.............................................................133.2.3.1可编程控制器的选用..................................................................................133.2.3.2组态软件选择..............................................................................................153.3混凝土搅拌站PLC程序设计..................................................................................163.3.1混凝土搅拌站PLC程序设计思想...................................................................163.3.2混凝土搅拌装置的工艺流程............................................................................173.3.3