Hauv kev txhaj tshuaj molding niaj hnub, qhov kub khiav qhov system sawv cev rau lub plawv zoo ib yam, siab -zoo ib feem ntau lawm, thiab nyob rau hauv nruab nrab ntawm txhua qhov kev txhim khu kev qha kub khiav yog cov thermocouple. Feem ntau underestimated nyob rau hauv nws qhov tseem ceeb, lub thermocouple tsuas yog ib feem muaj peev xwm muab tiag - sij hawm, ncaj qha, thiab rov ntsuas kub nyob rau hauv lub nozzle, manifold, thiab yaj ntws raws. Yog tias tsis muaj qhov tseeb, ruaj khov, thiab cov lus teb rau qhov kub thiab txias, txawm tias tus neeg ua haujlwm kub kub tshaj plaws tsis tuaj yeem tswj xyuas cov kev ua haujlwm zoo ib yam, ua rau muaj ntau yam tsis xws luag xws li kev txhaj tshuaj luv luv, flash, splay, kub hnyiab, warpage, dimensional instability, thiab cov khoom degradation. Rau siab - ntim, siab -precision, los yog tswj chaw tsim khoom-xws li cov cuab yeej kho mob, tsheb, hluav taws xob txuas, thiab ntim molding-thermocouple kev ua tau zoo tsis yog qhov kev xav thib ob; nws yog lub hauv paus uas tag nrho cov txheej txheem stability yog tsim.
Thermocouples ua haujlwm raws li cov nyhuv Seebeck, qhov tshwm sim ntawm lub cev uas muaj ob qhov sib txawv ntawm cov hlau alloys, koom nrog ib qho kawg los tsim ib qho kev sib tshuam, tsim ib qho me me, kwv yees qhov voltage proportional rau qhov sib txawv ntawm qhov ntsuas qhov ntsuas thiab qhov sib txuas txias ntawm qhov kev sib txuas ntawm tus maub los. Qhov no microvolt- theem teeb liab yog txhais los ntawm tus kub khiav maub los los kho cov hluav taws xob tso zis rau lub tshuab cua sov, tswj cov yaj ntawm qhov tseeb, qhov kub thiab txias. Hauv kev txhaj tshuaj molding, kub ncaj qha tswj cov yaj viscosity, ntws tus cwj pwm, shear npaum li cas, polymer saw qauv, thiab tus cwj pwm txias. Rau ntau cov khoom siv polymers, tshwj xeeb tshaj yog engineering-qib thiab siab- cov ntaub ntawv ua tau zoo, lub qhov rais ua tau zoo yuav nqaim li 5℃txog 10℃. Nyob rau hauv lub qhov rais nruj no, qhov kev ntsuas qhov yuam kev ntawm tsuas yog 2℃mus rau 3℃-yooj yim tshwm sim los ntawm qhov qis-zoo lossis tsis zoo ntsia thawv thermocouple- tuaj yeem thawb cov txheej txheem sab nraum qhov chaw ruaj khov, ua rau cov khoom tsis lees paub thiab nce nqi ntau lawm.
Tshaj li qhov tseeb, cov thermocouples siv nyob rau hauv lub tshuab kub khiav yuav tsum ua siab ntev ib puag ncig huab cua uas nyob deb tshaj qhov pom hauv ntau lwm cov ntawv thov kev lag luam. Lawv raug kub hnyiab tas mus li, feem ntau yog li ntawm 200℃mus rau tshaj 400℃rau cov polymers siab heev. Lawv yuav tsum tiv taus kev kub ceev ceev thaum lub sij hawm txhua lub voj voog txhaj tshuaj, txhua yam kev vibration los ntawm lub tshuab ua haujlwm thiab lub valve- qhov rooj qhib, tshuaj lom neeg raug rau cov pa taws thiab cov khoom siv ntxiv, thiab kev ntxhov siab ntawm lub cev thaum lub sij hawm nruab thiab hloov pwm. Tus qauv qis-qib thermocouples degrade sai nyob rau hauv cov xwm txheej no, tsim cov teeb liab drift, qeeb teb, kev sib txuas tsis tu ncua, thiab qhov ua tsis tiav. Vim li no, kev lag luam kub khiav tshuab yuav luag tsuas yog tso siab rau cov ntxhia dej -insulated (MI) thermocouples, uas muaj qhov tsis sib haum xeeb, thermal stability, thiab txhua yam muaj zog.
Kev nkag siab tag nrho ntawm thermocouple tsim, kev tsim kho, cov khoom siv, kev teeb tsa, thiab kev saib xyuas yog qhov tseem ceeb rau txhua tus molder aiming txo cov seem, nce uptime, txhim kho ib feem zoo, thiab txuas ntxiv kev pab cuam lub neej ntawm pwm thiab kub khiav cov khoom. Qhov no suav nrog kev paub txog cov chav kawm kam rau ua, hom kev sib txuas (grounded vs. ungrounded), cov ntaub ntawv sheath, cable shielding, suab nrov tiv thaiv, thiab calibration xyaum. Hauv kev tswj hwm kev lag luam, cov thermocouple kev ua tau zoo thiab cov ntaub ntawv ntsuas ntsuas kuj tseem raug cai rau kev tshuaj xyuas, ntawv pov thawj, thiab kev taug qab. Nyob rau hauv luv luv, lub thermocouple yog ntau tshaj li ib tug yooj yim sensor; Nws yog ib qho tseem ceeb ntawm cov txheej txheem tswj xyuas uas txiav txim siab tag nrho cov kev ua tau zoo, kev ntseeg tau, thiab cov txiaj ntsig ntawm tag nrho cov kev txhaj tshuaj molding ua haujlwm.
