会员注册 | 登录 | 微信快捷登录 支付宝快捷登录 QQ登录 微博登录 | 帮助中心 人人文库renrendoc.com美如初恋!
站内搜索 百度文库

热门搜索: 直缝焊接机 矿井提升机 循环球式转向器图纸 机器人手爪发展史 管道机器人dwg 动平衡试验台设计

   首页 人人文库网 > 资源分类 > DOC文档下载

外文翻译--系统的设计功能.doc

  • 资源星级:
  • 资源大小:38.00KB   全文页数:5页
  • 资源格式: DOC        下载权限:注册会员/VIP会员
您还没有登陆,请先登录。登陆后即可下载此文档。
  合作网站登录: 微信快捷登录 支付宝快捷登录   QQ登录   微博登录
友情提示
2:本站资源不支持迅雷下载,请使用浏览器直接下载(不支持QQ浏览器)
3:本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰   

外文翻译--系统的设计功能.doc

SystemstructureandcontrolschemesystemdesignfeaturesThecontrolsystemofventilationunitswithcentrifugalactivationofinterlockingandovertemperatureprotection.Andconventionalrelayscomparedtotheimplementationoftheventilationsystem,PLCsystemhasalowfailurerate,highreliabilityandwiringissimple,easymaintenanceandmanyotheradvantages,PLCcontrolfunctionssothatthventilationsystemsgreatlyenhancethedegreeofautomation,reducingthelaborjobsintensity.PLCandfrequencyconverterwiththeuseofairpressuretransmitter,allowingthesystemtocontrolthesecurity,reliability,greatlyimproved,butalsorunthefansignificantlyreducethefailurerate,notonlysavesenergybutalsoimprovetheoperationrateofequipment.Mineventilationsystemtomeettherequirementsofautomaticcontrolsystemthespecificdesignrequirementsareasfollows1Thissystemprovidesmanual/automaticmodeofthetwo,withastateofalarmdisplayandfeaturessuchasfaults.2AnalogPIDoperatorviapressureinput,outputanalogconvertercontrol.3Intheautomaticmode,whenthedownholepressurebelowthesetpressurelimit,twosetsoffanswillberunningtoworkatthesametime,atthesametimeandissuedinstructionsandalarmsignals.4Analoginputgas,whenthegasconcentrationisgreaterthantheupperlimitofalarmsettings,andreporttothepolicetogivedirections.Whenthegasconcentrationisgreaterthantheupperlimitofpowersettings,PLCwillcutoffthefaceandwindpowergeneratingunitstopreventthegasexplosion.5Theuseoftemperaturesensorsmeasuredtemperatureorthewindbearingunitstatortemperature,bearingtemperatureorwhenthestatortemperatureexceedsthesetalarmontheline,givedirectionsandwarningsignals.Whenthestatortemperatureorthewindbearingtemperatureexceedsthesettemperatureofthelineunitconversion,PLCwillcutofftheinstructionsandalarmsignalandautomaticallycutofftheairunitiscurrentlyrunninginautomaticmodeandcanautomaticallyaccessanotherrunTyphoonunit,ifinthehanddynamicmanner,staffmanuallyswitch1.6Inordertopreventfatiguecentrifugalfanoperationinanystate,setthefantoruninatotaltimewillautomaticallyswitchtoanotherunitoperationtyphoon.systemarchitectureandprogramVentilationcontrolsystemismainlycomposedof2setsofcentrifugalfans,centrifugalfanseachhavetwomotors,eachmotordrivesasetoffanfilms,twofilmsontherotatingfanandasetofwindsuction,agrouptoincreasewindspeed,forthewindtocarryoutunderground.Undergroundairvolumeinaccordancewiththedifferent,usingdifferenttypesoffans.Thedesignof245kWfanasanexample,theselectionofaS72200PLC,theairpressuresensorandtransducer,suchastheformationofacompleteclosedloopcontrolsystem.Includingcontactors,intermediaterelays,thermalrelays,MineExplosionproofmagneticstarter,circuitbreakerprotectionofelectricalsystems,electricalandPLCtoachieveeffectiveprotection,aswellasmotorcontrolswitch.PLCcontrolsystemwiththefanmotortostartandrun,monitor,interlockandovertemperatureprotection.PLCandwiththeuseofairpressuretransmitter,allowingthesystemtocontrolthesecurity,reliability,greatlyimproved,butalsorunthefansignificantlyreducethefailurerateandimprovetheoperationrateofequipment2.Forcoalmineventilationsystemtomeettherequirementsofautomaticcontrol,designofcontrolprogramsisasfollowsThesystemprovidesmanual/automaticmodeofthetwo,withscenecontrol,statusdisplayandalarmfailure.Inmanualmode,thefancontrolthroughtheswitchfromtheeffectsofairpressureinsidethemine.Inordertopreventfatiguefanrunning,inanystateinthecumulativefanruntimesettoswitchtoanothermachinerunningthetyphoon.AGroupBGroupcentrifugalfancentrifugalfanwithtwoswitchescanbeconverted.Timecyclesandtimingcanberandomlyset.Aresoundandlightalarmsignalform.VoiceAlarmelectricflutebuttoncanbeusedtolift,alarmtroubleshootinginstructionsautomaticallydisappear.Inautomaticmode,theuseofairpressureFarEasToneminedetectionsensorswithinthepressuresignal,thesignaltransmitterwilltransformthesiteintoaunifiedstandardsignaleg,420mADCcurrentsignal,05VDCvoltagesignal,etc.,intotheA/Dconverteranalogdigitalconversionmodule,andthenintothePLC,PLCtodetectthepressurevaluewithsetvaluesofpressureanddealwiththeworkoftheoutputsignaltocontrolfan.Whentheairpressureinsidethemineinanatmosphericpressureorinthesettingofavalueaboveatmosphericpressure,theworkofcentrifugalfancentrifugalfanwithbackupcycleoftheworkwhenasuddenaccident,theminesairpressureislowerthanasetofatmosphericpressurevalue,theworkofcentrifugalfancentrifugalfanwithbackupcycleisnolongerwork,andautomaticallyswitchtotheworkatthesametime,increasethevolumeofthemineventilation,mineuntilthepressurerosetovaluessetaboveatmosphericpressure,theworkofventilationcentrifugalfanwithbackupmachinetoresumethecycleofwork3.Gasinthemineforwindsystems,coalminegasconcentrationinthegasconcentrationdetectionsensorwithatransmittersignalwillbethesitetransformintoaunifiedstandardsignal,intotheA/Dconverteranalogdigitalconversionmodule,andthenintothePLC,thesamewillbedetectedbythePLCandsetnumericalvaluesforcomparison,whenthegasconcentrationgreaterthanthevalueaftertheset,PLCoutputsignalstocontrolfantostopworking,andtheoutputsignalpowerwasautomaticallycutminetomeettherequirementsofwindpowerinterlocktoavoidelectronicsparkslitthegastopreventgasexplosionaccident.系统的设计功能本控制系统具有离心通风机组的启动、互锁和过热保护等功能。与常规继电器实施的通风系统相比,PLC系统具有故障率低、可靠性高、接线简单、维护方便等诸多优点,PLC的控制功能使通风系统的自动化程度大大提高,减轻了岗位人员的劳动强度。PLC和变频器与空气压力变送器配合使用,使系统控制的安全性、可靠性大大提高,也使通风机运行的故障率大大降低,不仅节约了电能,而且还提高了设备的运转率。为满足矿井通风系统自动控制的要求,系统的具体设计要求如下(1)本系统提供手动/自动两种工作模式,具有状态显示以及故障报警等功能。(2)模拟量压力输入经PID运算,输出模拟量控制变频器。(3)在自动方式下,当井下压力低于设定压力下限时,两组风机将同时投入工作运行,同时并发出指示和报警信号。(4)模拟量瓦斯输入,当矿井瓦斯浓度大于设定报警上限时,发出指示和报警。当瓦斯浓度大于设定断电上限时,PLC将切断工作面和风机组电源,防止瓦斯爆炸。(5)运用温度传感器测定风机组定子温度或轴承温度,当定子温度或轴承温度超过设定报警上线时,发出指示和报警信号。当定子温度或轴承温度超过设定风机组转换温度界线时,PLC将切断指示和报警信号并自动切断当前运行风机组,在自动方式下并能自动接入另一台风机组运行,若在手动方式下,工作人员手动切换1。(6)为防止离心风机的疲劳运行,在任何状态下,风机在累计运行设定时间后都会自动切换至另一台风机组运行。结构和方案通风控制系统主要由2台离心风机组成,每台离心风机有两台电机,每台电机驱动一组扇片,两组扇片是对旋的,一组用于吸风,一组为增加风速,对井下进行供风。根据井下用风量的不同,采用不同型号的风机。本设计以风机245kW为例,选用一台S72200PLC、空气压力传感器和变频器等组成一个完整的闭环控制系统。其中还包括接触器、中间继电器、热继电器、矿用防爆型磁力启动器、断路器等系统保护电器,实现对电机和PLC的有效保护,以及对电机的切换控制。本PLC控制系统具有对通风机的电动机启动与运行,进行监控、联锁和过

注意事项

本文(外文翻译--系统的设计功能.doc)为本站会员(英文资料库)主动上传,人人文库网仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知人人文库网([email protected]),我们立即给予删除!

温馨提示:如果因为网速或其他原因下载失败请重新下载,重复下载不扣分。

copyright@ 2015-2017 人人文库网网站版权所有
苏ICP备12009002号-5