技师论文(终稿).doc

技师论文(终稿) 技师论文(终稿)xxshandong maintenanceelectrical technicianprofessional paperBased on the PLCs sealing machine,the frequencysaving energyis changedControl systemdiscussion Studentname:meng fanUnit:a classof maintenance electrician inshandong coaltechnology collegeAdvisor:zhang qingguo,lang navy,xue huiDate:MayxxBased onthe PLCs sealing machine,the frequencyenergy savingcontrol systemis discussed-author:meng fan【abstract】:The sealing machine isthe machihat sealsthe containerafter thecontainer isdressed.With theimprovement ofproduction andliving standard,the sealing machine inChina hasdeveloped rapidlyin recentyears.By referenceto internationalsame typeproducts,onthebasis of the digestion,absorption,self development,technology hadthe verybig enhancement,but in the newand hightechnology andnew technologydevelopment andforeign andlarge gap,such as the automation of the whole machineis nothigh,some alsouse largeamounts ofrelay control system,energy consumption,time consuming,work is not safeand reliable.This articlefrom theaspects ofenergy saving,time saving,humanized designthree,apex automationtrol equipment,PLC andfrequency converteris usedfor transformationof previousrelay control system,so asto promotethe development of thetechnology updates,faster.keywords:S7-200PLC,inverter,sealing packaging machine,temperature control,solid staterelay SSRProject backgroundand analysisThe processflow of the sealing packing Combiningthe above,its processincludes thefollowing steps: (1)connected to the power supply,the sealing packing machineagencies beganto work,electric heatelectric heatingelement,make upand downheating blocksrose sharply,and throughtemperature PIDcontrol system to adjustto therequired temperature,embossing wheelrotation,aording to the needof the cooling systemto work,conveyor belt,and the control deviceto adjusttotheidle state. (2)when equippedwith goodspackaging isthe front-end equipmenttransported tothe sealingpacking machineconveyor belt,bag sealing parts through the guidegroove His automaticallyinto run,between thetwo sealingwith FE andinto theheating area,heating blocksof heatthrough the sealing belttransmission tothe thinfilm byhot meltsealingpartof the soft bag,again throughthecoolingzone D,make thefilm surfacetemperature appropriate,and thenthroughtheknurled wheelrolling,make the sealing parts and plasticfilm bondingand suppressthe reticularpattern,and thenby rubberbelt andconveyor beltwill Bgood sealingbags sentout closed,sealingpacking machine toplete the sealing operation. (3)when thesealingpackingmachine inlow speedrunning aftersatisfactory effects,can graduallyincrease thesealing speedtothemaximum operatingspeed,at the same time,aording tothe technologicalrequirements appropriateto improvethesealingtemperature(different aording to differentmaterials,the settemperature).1.2control requirements (1)the inputpowersupplyis3phase380V powersupply.Active guidewheel,passive wheel (2)and throughthe mechanicalconnection betweenthe transmissionmechanism,and finallyby athree-phase380v/1.5KW asynchronousmotor drive,thesealingspeed requirementscan speed(015m/min),speed regulationprecision of1. (3)the temperaturerange of0400,the temperature control precisionof plusor minus2.The temperaturedetection of thesealingmachine Temperatureis in the process of sealing packagingmachinecontrol oneof themost monanalog,due tothe temperature sensor outputintheprocessoftemperature measurementisnota standardin010v or420ma,such aslinear signal,therefore needto convert.2.1module selectionThis topicselects thek-type thermocouplesensor and the EM231thermocouple moduleof Siemens s7-200.K thermocouplediagram:Siemens s7-200EM231thermocouple module:The EM231thermocouple moduleprovides aconvenient,isolated interfacefor seventhermocouple types:J,K,E,N,S,T andR.It allowsthes7-200to connecttiny analogsignals,with avoltage rangeof plusor minus80mV.The usermust usethe DIPconfiguration switchto select the typeof the thermocouple,the linecheck,the measuringunit,the coldend pensationand the direction of the opencircuit fault.All thermocouplesconnected tomodules must be of thesametype.The configurationDIP switchis locatedat thebottom of the module.2.2thermocouple andPLCs hardwareconnection Because of thistopic needto adoptthe transistoroutput PLC(solid staterelay output),so theselection ofPLC forCPU224DC/DC/DC,working poweris24v DC,extension moduleEM2314tc powerfor24v DC.(note:thedirectionof thethermocouple wirecantbereversed.)When thewiring isplete,set theDIP Settingsof EM2314TC:SW3is1,SW1/2/5/6/7/8is0.Temperature controlof sealingpackingmachineIn thetemperaturecontrolof thesealingmachine,thethermocouple,which has a simplestructure,high temperaturerange andfast response,is usedasthetemperaturesensor.When the PLC issampled tothe actualtemperature,and thenpared with the setvalue,the PIDcontrol can be controlledand thesolid staterelay canbe controlledto make the heaterpass andbreak.Extension knowledge:(solid staterelay)SSR,or SSR,is anew contactlessswitch developedby modernmicroelectronics andpower electronics.It isa four-terminal activedevice,two inputcontrol terminals,two outputterminals.The inputand outputare separatedby thephotoelectric,the inputside plusthe dcor thepulse signal,the outputterminal from the brokenstate tothe generalstate.The wholedevice hasno movingpartsandelectric shocks,which isthe equivalentof anelectromagic relay.Project designideas Thedesign principleofthecontrolsystemofthesealingmachineThoroughly understandand analyzethe controlledobject-sealingpackagingmachine IdentifyI/O devicesAording tothecontrolrequirements,determine theinput device (4)control signalhas abutton,selector switch,sensor,the outputdevice (6)output signalhasathree-phase aontactor,intermediate relays,solid staterelay andindicator lights.3.The equipmenttype selectionPLC:Siemenss7-200CPU224DC/DC/DC(EM231thermocouple module)Frequency converter:Siemens MM440converter AssignI/O points(see theI/O notationtable below)Design applicationladder diagramProgramming software,which is programmed byprogramming software,isprogrammedintheform ofa workingfunction chartor statediagram.Download theladder diagramprogram toPLC throughthe municationcable Dosoftware testingOverall debuggingoftheapplication systemAfter thePLC software,hardware designand controlcabi andsite constructionare pleted,thewholesystem canbe adjustedon-line.Prepare technicaldocuments Thesystem technicaldocumentation includesthe specification,electrical schematicdiagram,electrical arrangementdiagram,electrical ponentdetail watch,PLC ladderdiagram,etc Thehardware partofthesealingmachineElectronic controlprinciple diagram2.I/O configurationExternal wiringdiagram Thesoftware sectionofthe4.3-sealingmachineProgram thePLC withSTEP7micro/win softwaremain program:subroutine:interrupt program:The interrupttrigger timeis SMB34and thetrigger eventis10converter parameterSettings:Set itdirectly onthe BOPpanel P0010=30P0970=1returns factorydefault valuesThe P0003=2sets theuser aesslevel asan extensionP0004=7mand andbinary I/O TheP0700=2mand sourceselects inputfromtheterminal TheP0701=1defines portnumber5as ONand OFFP0702=17P0703=17P0704=17selectthefixed frequency(binary encoding+ON mand)P1000=3choose fixed frequency setvalues P1080=0(HZ)sets thelowest frequencyP1082=50(HZ)sets thehighest frequencyP1001=5(HZ)set fixed frequency5(HZ)P1002=10(HZ)sets thefixed frequency10(HZ)P1003=20(HZ)set thefixed frequency20(HZ)P1004=30(HZ)set thefixed frequency30(HZ)P1005=35(HZ)set thefixed frequency35(HZ)P1006=40(HZ)set thefixedfrequency40(HZ)P1007=50(HZ)sets thefixedfrequency50(HZ)Conclusion:Aiming atsome problemsappeared inpractical production,this paperadopts theSiemens S7-200PLC andMM440inverter fortechnological transformation,the originalrelay controlsystemtoPLC inthe serialport driverwith thecorresponding demandresponse ofthe configurationsoftware,the binationof loadingdrive,make Settingscontrol canaordingtothe realsituation.Practice provedthat thePLC controlof frequencyconversion speedregulation inthe production of machinery,the programmingis flexible,convenient control,realize theautomationofthe productionand batchproductionofintegration.If thecost ofthe economyis allowed,it canalso adda PLCman-machine interface(HMI),withtheuseofWin flexblefor morehuman production.It canchange theopenness ofthePLCcontrolsystemhas alwaysbeen thelack ofweaknesses,makethesystem runthe man-machine dialogue/monitoring problemcanbefundamentally solved,realize inthe truesenseautomation.As agraduating collegestudents,thatlearnthe truth,we onlykeep pacewith TheTimes,solid playscan inthe lateractual work.With thedevelopmentofscience andtechnology,the newelectrical equipment,electri