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1、InjectionmoldingmachineandonthecontrolofitModernplasticinjectionmoldingmachineisasetofmechanical,electricalandfluidinonetypicalsystem,asthisdevicehasformingcomplexproducts,lesspost-processing,processingcharacteristicsoftheplasticvariety,sinceitsinceptionhasgro
2、wnrapidly,thecurrentfullOver80%oftheworldfsproductsareusedplasticinjectionmoldingmachineforprocessing・Conventionalinjectionmoldingmachinesgenerallyuseasimpleopen-loopcontrol,thatis,inaccordancewithapre-setvalueofcontrol.Inthedevicemanufacturingprocess,pre-conf
3、iguredparametervalues,suchastheclampingforce,cycletime,temperature,etc.,fromthemachineintheproductionprocessbemaintained.Forexample,bycontrollingthedietemperaturecanbemaintainedthetemperatureofheatingfluid,plastictemperaturecanbeoutsidetheheatingdevicebycontro
4、llingthepowertomaintain.Thiscontrolmethodofsimplestructure,however,pooranti-interferenceabilitytocontrolthetemperatureisrelativelylow.Atpresent,moreinjectionmoldingmachineusesaclosed-loopcontrol,thatis,accordingtoon-linemeasurementvalueandsetthevalueofthedevia
5、tioncontrol.Closed-loopcontrolsystemusesanegativefeedbackloop,anti-jammingability,whentheinjectionspeed,injectionpressure,moldcavitytemperature,cavitypressure,melttemperatureandoilpressureduetointerferenceintheproductionprocess,deviationofthemachinethroughthea
6、daptivecontrolsystemforautomaticcorrectionofinterference.Thiscontrolmethodofanti-interferenceability,highcontrolaccuracy.Moreadvancedcontrolmethodistoapplycomputercontrolled,thatis,tobuildaclosed-loopreal-timecomputercontrolsystem.Itincludesdirectdigitalcontro
7、lsystem(DDC),supervisorycomputercontrolsystem(SCC),distributedcontrolsystem(DCS)andmulti-levelcontrolofseveraltypes.Commonlyusedinjectionmoldingmachinecontrolsystemhasthreekinds,namely,thetraditionalrelay-based,programmablecontrollersandcomputer-basedcontrolty
8、pe.Inrecentyears,programmablelogiccontroller(referredtoasPLC)withitshighreliability,high-performancecharacteristicsininjectionmoldingmachinecontrolsystemhasbeenwidelyused.Inorderto
