Design-of-PLC-based-Hydraulic-System-for-Workpiece

ProcediaEngineering15(2011)122–1261877-7058©2011PublishedbyElsevierLtd.doi:10.1016/j.proeng.2011.08.025Availableonlineat(2011)000–000ProcediaEngineering*SchoolofMechanicalandElectronicEngineeringWeifangUniversityWeifang261061ChinaAbstractWorkpieceturnoveriscompletedautomaticallybytheautomaticturnoverdeviceinautomaticproductionline,Workpieceturnoverdeviceisanimportantpartofautomaticproductionline.Itshydraulicsystemwasdesigned,itsworkingprinciplewasanalysed,andthePLCcontrolsystemwasdesignedaccordingtothecontrolrequirementstothehydraulicsystemofworkpieceturnover.TheSiemensPLCofSIMATICS7-200CPU266wasselectedandaSTEP7-Micro/WINprogrammingsoftwarewasusedtoprogramthesystemcontrolprocess.UsingPLCcontrolhydraulicsystem,canbeveryeasytomeetprocessrequirements,improvegreatlythesystemstability,reliability,securityandautomationlevel.©2011PublishedbyElsevierLtd.Selectionand/orpeer-reviewunderresponsibilityof[CEIS2011]Keywords:ProgrammableLogicController;hydraulicsystem;PLCcontrolsystem;workpieceturnoverdevice1.IntroductionWorkpieceturnoverdeviceisanimportantpartoftheautomaticproductionline,workpieceturnoverisachievedwellbyusinghydrauliccontrolofthemechanicaldevice[1].PLC(ProgrammableLogicController,referredtoasPLC)isdigitaloperationofelectronicsystemdesignedforapplicationsinindustrialenvironments.Integratingcomputertechnology,automaticcontroltechnologyandcommunicationtechnology,itbecomesthecoreequipmenttoachievestand-alone,workshopsandfactory*WANGHong.Tel.:[phone]E-mailaddress:[e-mail].123WANGHong/ProcediaEngineering15(2011)122–126Authorname/ProcediaEngineering00(2011)000–000automation.Ithasadvantagesofhighreliability,stronganti-interference,flexiblecombination,simpleprogramming,easymaintenanceandalso[2].Inthispaper,SIMATICS7-200seriesprogrammablecontrollersandothercomponentswereusedtoconstituteelectricalcontrolsystemforhydraulicsystemofworkpieceturnoverdeviceofautomatedproductionlinestomeetthecontrolrequirements.2.HydraulicSystemDesign2.1.HydraulicSystemDesignRequirementsWorkpieceturnoverdevicecanclamptheworkpieceandthenturnthemover180°.Itworksinthefollowingorder:Downtheexecutivebody→Clampingtheworkpiece→Uptheexecutivebody→Theworkpieceturnover180°→Downtheexecutivebody→Releasingtheworkpiece→Uptheexecutivebody.Onecycle.iscompleted.Tomeetaboverequirements,theworkpieceturnoverdevicetendtoadopthydraulicsystem..2.2.HydraulicSystemDiagramHydraulicsystemdiagramisshowninFigure1[3].Thedirectionofmovementoftheliftingcylinder9iscontrolledbythethreefour-waysolenoidvalve7,theclampingcylinder10bythethreefour-waysolenoidvalve12andtheflippinghydrauliccylinder13bythethreefour-waysolenoidvalve14.One-waythrottlevalve8and11areusedinspeedadjustmentofthereturnoilthrottle.Theexecutivebodyiscontrolledbytheliftingcylinder9,theclampingcylinder10andtheflippinghydrauliccylinder13.One-waythrottlevalve8isalsousedtobalancethedeadweightoftheliftingcylinderanditsworkingbodiesinordertopreventthedecline.Figure1hydraulicsystemdiagram1-filter2、3-doublevanepump4-Tank5、6-reliefvalve7、12、14-solenoidvalve8、11-one-waythrottlevalve9-liftingcylinde10-clampingcylinder13-turningcylinder15-throttlevalve1YA2YA3YA4YA95YA6YA10138151171214562341S1S2S3S4S5S6124WANGHong/ProcediaEngineering15(2011)122–126Authorname/ProcediaEngineering00(2011)000–0002.3.workingprincipleofthehydraulicsystemTheactionorderofhydraulicsystemareshowninTable1[4]:Table1.ActionsequencetableofhydraulicsystemMagnetstatusSequencenumberSignalSourceActionName1YA2YA3YA4YA5YA6YA1PresstheStartbutton（PushlimitswitchS5）Liftingcylinderdown+2PushlimitswitchS2clampingcylinderclamping+3PushlimitswitchS4Liftingcylinderup+4PushlimitswitchS1turnoverdeviceturning+5PushlimitswitchS6Liftingcylinderdown+6PushlimitswitchS2workpiecereleased+7PushlimitswitchS3Liftingcylinderup+8PushlimitswitchS1clampingcylinderpistonrodbacktotheposition+3.PLCControlSystemDesign[5]3.1.PLCI/OaddressallocationAccordingtothedesignprinciplestoreducecosts,consideringcontrolrequirementstothehydraulicsystemofworkpieceturnover,weselectedtheSiemensPLCofSIMATICS7-200CPU266.Accordingtothespecificrequirementsofthecontrolobject,thePLC'sinputandoutputpointsweredetermined.TheI/Oaddressallocationwasintable2.3.2.SystemSoftwareDesignASTEP7-Micro/WINprogrammingsoftwarewasusedtoprogramthesystemcontrolprocess,theflowchartwasshowninFigure2.4.SummaryWorkpieceturnoverhasbeenachievedwellbyusinghydrauliccontrolofthemechanismmovement.UsingPLCcontrolhydraulicsystem,canbeveryeasytomeetprocessrequirements.125WANGHong/ProcediaEngineering15(2011)122–126Authorname/ProcediaEngineering00(2011)000–000Table2.I/OaddressallocationtableInputsectionOutputsectionaddresscomponentInputsignaladdresscomponentOutputsignalI0.0SB1systemstartupQ0.01YAliftingcylinderdownI0.1SB2systemtostopQ0.12YAliftingcylinderupI0.2SB3automaticcontrolQ0.23YAclampingcylindercla