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1、InjectionmoldingmachineandonthecontrolofitModernplasticinjectionmoldingmachineisasetofmechanical,electricalandfluidinonetypicalsystem,asthisdevicehasformingcomplexproducts,lesspost-processing,processingcharacteristicsoftheplasticvariety,sinceitsinceptionhasgrownra
2、pidly,thecurrentfullOver80%oftheworld'sproductsareusedplasticinjectionmoldingmachineforprocessing.Conventionalinjectionmoldingmachinesgenerallyuseasimpleopen-loopcontrol,thatis,inaccordancewithapre-setvalueofcontrol.Inthedevicemanufacturingprocess,pre-configuredpa
3、rametervalues,suchastheclampingforce,cycletime,temperature,etc.,fromthemachineintheproductionprocessbemaintained.Forexample,bycontrollingthedietemperaturecanbemaintainedthetemperatureofheatingfluid,plastictemperaturecanbeoutsidetheheatingdevicebycontrollingthepowe
4、rtomaintain.Thiscontrolmethodofsimplestructure,however,pooranti-interferenceabilitytocontrolthetemperatureisrelativelylow.Atpresent,moreinjectionmoldingmachineusesaclosed-loopcontrol,thatis,accordingtoon-linemeasurementvalueandsetthevalueofthedeviationcontrol.Clos
5、ed-loopcontrolsystemusesanegativefeedbackloop,anti-jammingability,whentheinjectionspeed,injectionpressure,moldcavitytemperature,cavitypressure,melttemperatureandoilpressureduetointerferenceintheproductionprocess,deviationofthemachinethroughtheadaptivecontrolsystem
6、forautomaticcorrectionofinterference.Thiscontrolmethodofanti-interferenceability,highcontrolaccuracy.Moreadvancedcontrolmethodistoapplycomputercontrolled,thatis,tobuildaclosed-loopreal-timecomputercontrolsystem.Itincludesdirectdigitalcontrolsystem(DDC),supervisory
7、computercontrolsystem(SCC),distributedcontrolsystem(DCS)andmulti-levelcontrolofseveraltypes.Commonlyusedinjectionmoldingmachinecontrolsystemhasthreekinds,namely,thetraditionalrelay-based,programmablecontrollersandcomputer-basedcontroltype.Inrecentyears,programmabl
8、elogiccontroller(referredtoasPLC)withitshighreliability,high-performancecharacteristicsininjectionmoldingmachinecontrolsystemhasbeenwidelyused.Inorderto
