何威威毕业设计

北华大学毕业设计（论文）-1-摘要现今的自动化水平逐年增高，PLC作为主控制器，一直处在整个技术领域的主要战场。为许许多多的自动化装备提供了很好的控制环境。作为一个控制器，PLC可以给自动化装备提供牢靠且安全的运行方案，完全适应当今大部分工厂对自动化的需求。本论文主要研究的是一个以PLC为自动控制的核心，设计出一个电解铝生产过程中氧化铝粉输送的自动控制系统。由于传统采用机械式输送，运输过程中氧化铝粉飞扬损失大、污染严重，而且加料量不容易控制，能耗大。所以本课题中采取浓相气力输送技术，浓相输送氧化铝粉末技术具有长距离输送、粉末状物料在整个输送过程中飞扬损失小、运行安全牢靠且高度自动化等优点。浓相输送技术是由压力罐系统、浓相管和PLC自动控制设备等组成。它的工作原理是：物料进入压力罐中后经压缩空气加压呈沸腾状态，并维持这一状态，确保物料进入特制的浓相管中就被压缩空气分割成一段一段的料栓向前流动，实现物料的输送。整个控制系统采用PLC控制器，PLC具有可靠性高，抗干扰能力强，编程简单易学，适应性好，功能强大等优点，可以很好地解决氧化铝输送过程控制中的安全、灵活、环保、经济等问题。关键词：PLC；氧化铝粉浓相输送；监控北华大学毕业设计（论文）-2-AbstractToday'sautomationtechnologyisdevelopingrapidly，remainthekeybattlegroundinthefieldofindustrialautomationcontrolofPLC，forallkindsofautomaticcontrolequipmentprovidesareliablecontrolapplications.Themainreasonisthatitcanprovidesafeandreliablefortheautomatedcontrolapplicationandmoreperfectsolutions，suitableforthecurrentindustrialenterpriseofautomationneed.Thistopicresearchisaprogrammablecontroller(PLC)asthecoreoftheautomaticcontrolequipment，designaelectrolyticaluminumproductionprocessofaluminapowderconveyingsystemofautomaticcontrol.Becauseofusingtraditionalmechanicalconveyingaluminapowderdustduringtheprocessoftransportationdamage，pollutionisserious，alsoaddcapacityisnoteasytocontrol，largeenergyconsumption.Sothistopicinthedensephasepneumaticconveyingtechnology，densephaseconveyingaluminapowdertechnologycharacteristicsoflongtransmissiondistance，lowenergyconsumption，lowmaterialintheprocessofconveyingbrokenrefining，flyingmateriallossissmall，stableandreliableandhighlyautomatedoperation，etc.Densephaseconveyingtechnologyconsistsofpressuretanksystem，densephaseandconsistsofaPLCautomaticcontrolequipment，etc.Itsworkingprincipleis：afterthematerialintothepressuretankinboilingstatebythecompressedairpressure，andmaintainthisstate，toensurethatthematerialintothespecialinthedensephasetubeiscompressedairintosectionbysectionboltforwardflow，transportthematerial.DesignUSESthePLCcontroller，PLCcontrollerwithhighreliability，stronganti-interferenceability，simpleprogramming，goodadaptability，powerfuladvantages，tobeabletogetagoodaluminaconveyingprocesscontrolofreliable，safe，flexible，convenient，economicandotherissues.KeyWords：PLC：Aluminapowderdensephaseconveying：Monitoring北华大学毕业设计（论文）-1-目录摘要...................................................................................................................................1Abstract......................................................................................................................................21绪论........................................................................................................................................11.1课题设计背景.............................................................................................................11.1.1课题来源..........................................................................................................11.1.2课题的目的和意义.........................................................................................11.2研究现状.....................................................................................................................21.2.1稀相输送..........................................................................................................21.2.2浓相输送..........................................................................................................31.2.3超浓相输送......................................................................................................32系统工艺控制要求...............................................................................................................52.1系统工艺过程.............................................................................................................52.2控制方法的选择........................................................................................................82.2.1PLC的工作原理..............................................................................................82.2.2PLC的构成......................................................................................................82.3控制方案.....................................................................................................................92.4控制电路...................................................................................................................112.4.1提升机装置测控电路...................................................................................112.4.2浓相输送测控电路.......................................................................................122.4.3除尘系统控制电路.......................................................................................132.5工艺设计目标...........................................................................................................133系统控制方案的选择.........................................................................................................143.1上位机.......................................................................................................................143.2PLC...............................................................