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1、InjectionmoldingmachineandonthecontrolofitModernplasticinjectionmoldingmachineisasetofmechanical,electricalandfluidinonetypicalsystem,asthisdevicehasformingcomplexproducts,lesspost-processing,processingcharacteristicsoftheplasticvariety,sinceitsinceptionhas
2、grownrapidly,thecurrentfullOver80%oftheworld'sproductsareusedplasticinjectionmoldingmachineforprocessing.Conventionalinjectionmoldingmachinesgenerallyuseasimpleopen-loopcontrol,thatis,inaccordancewithapre-setvalueofcontrol.Inthedevicemanufacturingprocess,pr
3、e-configuredparametervalues,suchastheclampingforce,cycletime,temperature,etc.,fromthemachineintheproductionprocessbemaintained.Forexample,bycontrollingthedietemperaturecanbemaintainedthetemperatureofheatingfluid,plastictemperaturecanbeoutsidetheheatingdevic
4、ebycontrollingthepowertomaintain.Thiscontrolmethodofsimplestructure,however,pooranti-interferenceabilitytocontrolthetemperatureisrelativelylow.Atpresent,moreinjectionmoldingmachineusesaclosed-loopcontrol,thatis,accordingtoon-linemeasurementvalueandsettheval
5、ueofthedeviationcontrol.Closed-loopcontrolsystemusesanegativefeedbackloop,anti-jammingability,whentheinjectionspeed,injectionpressure,moldcavitytemperature,cavitypressure,melttemperatureandoilpressureduetointerferenceintheproductionprocess,deviationofthemac
6、hinethroughtheadaptivecontrolsystemforautomaticcorrectionofinterference.Thiscontrolmethodofanti-interferenceability,highcontrolaccuracy.Moreadvancedcontrolmethodistoapplycomputercontrolled,thatis,tobuildaclosed-loopreal-timecomputercontrolsystem.Itincludesd
7、irectdigitalcontrolsystem(DDC),supervisorycomputercontrolsystem(SCC),distributedcontrolsystem(DCS)andmulti-levelcontrolofseveraltypes.Commonlyusedinjectionmoldingmachinecontrolsystemhasthreekinds,namely,thetraditionalrelay-based,programmablecontrollersandco
8、mputer-basedcontroltype.Inrecentyears,programmablelogiccontroller(referredtoasPLC)withitshighreliability,high-performancecharacteristicsininjectionmoldingmachinecontrolsystemhasbeenwidelyused.Inorderto
