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PLC在混凝土搅拌站中的应用论文[带图纸].doc

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PLC在混凝土搅拌站中的应用论文[带图纸].doc

无锡太湖学院本科毕业设计(论文)诚信承诺书本人郑重声明所呈交的毕业设计(论文)PLC在混凝土搅拌站中的应用是本人在导师的指导下独立进行研究所取得的成果,其内容除了在毕业设计(论文)中特别加以标注引用,表示致谢的内容外,本毕业设计(论文)不包含任何其他个人、集体已发表或撰写的成果作品。班级机械94c学号0951295c作者姓名2013年5月25日I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。本程序通过控制发电机运转、皮带启动、螺旋输送机的运行等方面控制混凝土搅拌站的运行。关键词混凝土搅拌站I/O分配可编程控制器(PLC)自动控制ABSTRACTConcretemixingstationswereproducedanddevelopedwiththebirthofcement.Itistheconstructionofthenecessaryequipmentforbuildings,bridges,roads,damsandotherprojects.Itsconstructedfromstoragematerials,ingredients,stirring,discharge,andotherstructuralcomponents,anditisasubjecttotheconstraintsofthecomplexmultilinksystem.AsChinaseconomicconstructionandtherapiddevelopment,Comprehensivenationalstrengthconstantlyenhancethestatesinfrastructureconstructioninvestmentincreasedtoboostthecitysrapiddevelopmentofreadymixedconcrete,sothattheconcretemixingstationshavelargerspacefordevelopment,theinitialMixingstationonlyintheformofstandalone,selfmixconcreteoccupied,withtheconstructionofinfrastructurefacilitiesforlargescale,alotofreadymixedconcretemarketwasdeveloped,thedemandformixingstationsarelargerandlarger,andmeasuresareincreasinglydemanded,sothemixingstationswithvariousformsofmeasurementdevicesweredeveloped,therebythemodernconcretemixingstationwascreated.CommonconcretemixingstationscontrolwaysmaybethethreekindsRelaydirectcontrol,PLCandcomputercombinationofingredientsandthePLCandcontrollercombination.ButPLCcontrollerandacombinationofingredientscontrolofthemixingstationisreliable,costeffectiveandcanensurethequalityofconcrete,increasetheproductionefficiency.Asthecoreofconcretemixingstations.Thecontrollingandmonitoringprograminthemeasurementprecise,reliablecontrol,easymanagementandotheraspectsisincreasinglydemanded.ThispaperforPLCandthecombinationofingredientscontrollertocontrolthemixingstationwilldesignitscontrollingandmonitoringprogram.InthemaintextImustcompleteasystematicstructure,theI/OdistributionofPLCandpreparetheworkflowchartandPLCprogram.KeywordsconcretemixingstationtheI/OdistributionprogrammablelogiccontrollerPLCautomaticcontrolIII目录摘要................................................................................................................................................IABSTRACT...................................................................................................................................II1绪论.............................................................................................................................................11.1本课题研究的内容和意义..................................................................................................11.2国内研究以及混凝土搅拌机的现状和国内市场分析......................................................11.2.1国外PLC发展状况......................................................................................................11.2.2国内PLC发展状况......................................................................................................21.3本课题应达的要求.............................................................................................................22混凝土搅拌站设备.....................................................................................................................32.1水泥的运输、存储..............................................................................................................32.1.1水泥罐车........................................................................................................................32.2水泥料仓..............................................................................................................................52.2.1粉料罐............................................................................................................................52.2.2仓顶收尘机....................................................................................................................62.2.3压力安全阀....................................................................................................................62.2.4吹灰管............................................................................................................................62.2.5料位指示器....................................................................................................................62.2.6手动蝶阀........................................................................................................................72.2.7粉料罐............................................................................................................................72.2.8破拱装置........................................................................................................................72.2.9检修梯子........................................................................................................................72.2.10仓体..............................................................................................................................72.2.11支腿..............................................................................................................................72.3水泥料仓的工作原理..........................................................................................................82.4配料站..................................................................................................................................82.4.1粉料称量........................................................................................................................82.4.2称重传感器....................................................................................................................92.5物料输送系统....................................................................................................................102.5.1骨料输送......................................................................................................................102.5.2粉料输送......................................................................................................................102.5.3液体输送......................................................................................................................102.6混凝土搅拌机....................................................................................................................113混凝土搅拌站PLC程序设计..................................................................................................123.1混凝土搅拌站接线图........................................................................................................123.2电器控制构成....................................................................................................................143.2.1PLC的工作原理..........................................................................................................153.2.2可编程控制器的选用及组态软件的选择.................................................................173.3.2模拟输入量包括砂子、石子等重量.........................................................................173.2.4I/O分配表....................................................................................................................173.2.5PLC接线图..................................................................................................................183.2.6智能元件.....................................................................................................................193.2.7传感器.........................................................................................................................203.2.8执行机构.....................................................................................................................203.3混凝土搅拌站工作流程....................................................................................................203.4系统初始化程序及主程序设计........................................................................................203.5断电保护程序设计............................................................................................................223.6模拟量输入地址................................................................................................................233.7位存储区(M)的使用概况............................................................................................234混凝土搅拌站控制系统设计...................................................................................................245混凝土配合比计算...................................................................................................................265.1混凝土配制强度计算........................................................................................................265.2水灰比计算........................................................................................................................265.3用水量计算........................................................................................................................275.3.1干硬性和塑性混凝土用水量的确定.........................................................................275.3.2流动性和大流动性混凝土的用水量宜按下列步骤计算.........................................275.4水泥用量计算....................................................................................................................285.5粗骨料和细骨料用量的计算..........................................................................................286结论与展望...............................................................................................................................306.1结论..................................................................................................................................306.2不足与展望......................................................................................................................30致谢.............................................................................................................................................31参考文献.......................................................................................................................................32附录.............................................................................................................................................33

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