Txawm hais tias ua los ntawm kev paub nyob rau hauv kev lag luam, ntau cov khoom siv dav dav tau pom zoo tsim qauv qhov ntau. Txawm li cas los xij, raws li cov khoom tsim tshwj xeeb tshiab tau nce nrawm dua, nws cia siab tias yuav muaj cov qauv sim los txiav txim siab qhov tsawg kawg nkaus uas yuav tsum tau ua rau cov khoom siv. Ntawm no, peb qhia ib txoj kev ua tau rau kev txiav txim siab qhov tsawg kawg uas yuav tsum tau muaj. Kev tsim tawm ntawm kev ua haujlwm ntawm lub vuam taub hau yog nyob ntawm cov khoom siv zaus, qhov tso tawm qhov hloov ntawm qhov hloov pauv, qhov sib pauv hloov ntawm qhov tau hloov kho qhov sib txawv (tshuab raj), thiab cov qauv tsim ntawm lub taub hau vuam. Tus qauv vuam taub hau tsim tshwj xeeb yog: nyob rau hauv cov xwm txheej ntawm qis dua qhov tsis txaus siab qhov kev nyuaj siab ntawm cov khoom, qhov loj dua lub taub hau vuam tsim kev sib piv, qhov zoo dua (uas yog, qhov loj dua cov zis loj dua, zoo dua). Yog tias koj xav tau txo cov ntau me, hloov cov kev hloov pauv ntuag nrog qhov sib piv me me lossis kho qhov ntsuas hluav taws xob kom txo cov ntau yam.
Txawm li cas los xij, tus qauv txheej txheem no muaj qee qhov tsis zoo:
Kev hloov pauv tsis tuaj yeem faib tsis tau ib qho, uas yog, qhov sib pauv hloov pauv ntawm lub taub hau vuam thiab lub zog loj ntxiv tau txawv heev. Nws yuav tsum raug sau tseg tias thaum lub taub hau vuam vias thiab cov amplitude modulator muaj qhov hloov pauv sib piv, qhov kev ua tau zoo ntawm ultrasonic triplet (transducer + amplitude modulator + vuam taub hau) yuav ua kom zoo dua.
Los ntawm hloov qhov voltage mus txo qhov vuam taub hau kev hloov pauv piv, tib lub sijhawm nws yuav txo cov khoom tawm hluav taws xob hauv lub thawv hluav taws xob. Piv txwv li, thaum lub amplitude tau teev rau 50%, lub thawv hluav taws xob nrog lub zog tso zis tawm thawj zog ntawm 2400W yuav tawm tiag tiag 1200W. Nws yog ib qho yooj yim ua rau overload.
Kev siv ntau qhov loj me yuav ua rau tsis tsim nyog qhov kev puas tsuaj rau cov ntu. Piv txwv li, cov kab nrib pleev hauv thaj chaw me me ntawm cov kab mob tuaj yeem ua rau kub hnyiab hauv qhov tsos, thiab yuav ua kev puas tsuaj rau cov qog ua kua, lim daim nyias nyias thiab cov khoom siv hluav taws xob.
Rau cov xwm txheej saum toj no, nws yog qhov tseem ceeb heev los txhais tau qhov tsawg kawg nkaus uas yuav tsum muaj rau ultrasonic vuam ntawm plastics hauv theem thaum ntxov.
Amplitude xam Qhov loj ntawm lub nthwv kis mus rau ib feem ntawm cov yas yog cov khoom lag luam tawm ntawm qhov tawm ntawm cov tshuab hloov pauv, qhov sib piv ntawm cov amplitude qhov sib txawv thiab qhov sib piv ntawm lub taub hau vuam.
Cov txheej txheem tsim tawm ntawm kev hloov pauv thiab qhov sib piv ntawm cov ntaws ntab ntuag tau muab los ntawm cov kws tsim cov khoom siv ultrasonic thiab feem ntau tsau. Tab sis vuam lub taub hau kev hloov pauv piv tau tsim los.
Vuam taub hau kev sib hloov ua piv txwv muaj qhov kwv yees qhov kwv yees: vuam lub taub hau kev sib piv=qhov loj tshaj ntawm vuam taub hau n ÷ loj hauv qab ntawm vuam taub hau. Txij li cov khoom siv ntom nti thiab qhov ntev yog tib yam, cov qauv tshuaj tau yooj yim xws li: vuam taub hau kev hloov sib piv=qhov chaw hla ntawm qhov chaw sab saum toj taub hau vuam ÷ qhov chaw hla hauv qab thaj chaw hauv qab vuam taub hau × 0.8. Qhov 0.8 coefficient yog los xav txog qhov muaj feem ntawm qhov hloov mus los ntawm fillet ntawm node.
Los ntawm cov qauv no, laij theoretical output amplitude ntawm vuam lub taub hau hauv qhov kev xeem hauv qab no 13.9um (ncov txog ncov). Lub ntsuas ua kom dav dav yog 15um (ncov txog ncov). Ob qho ze sib ze.
Hauv cov txheej txheem sim, cov khoom siv amorphous PC thiab cov khoom siv semi-crystalline PP yog raug xaiv rau qhov kev sim los txiav txim siab qhov tsawg kawg nkaus ntawm cov khoom siv uas xav tau los ntawm ob cov ntaub ntawv.
Servo-driven ultrasonic vuam cov khoom siv tau zoo heev rau kev txiav txim siab qhov tsawg kawg ntawm kev kuaj ntsuas. Vim tias nws lub taub hau vuam tuaj yeem hover, thiab tsim cov ntaub ntawv ntsuas ntsuas siab, thiab correlate nrog cov ntaub ntawv xws li ultrasonic vibration amplitude. Hauv cov ntsiab lus," Melt-phim" kev ua haujlwm ntawm lub cuab yeej tso cai rau lub taub hau vuam mus cuag cov khoom lag luam nrog lub teeb tsa, nres nqis thiab pib ultrasonic kev co. Lub ultrasonic kev co yog kis mus rau qhov chaw ntawm yas txuas. Thaum lub cuab yeej ntsuas lub siab poob, lub polymer nto tau pib yaj. Tom qab ntawd lub taub hau vuam pib txav mus rau hauv qab.
Peb feem ntau ntseeg tias cov khoom siv amorphous PC, tom qab qhov kub siab tshaj qhov hloov pauv ntawm lub iav kub, yuav qhia tawm qhov ua cim maj mam muag zuj zus vim tias qhov kub nce ntxiv. Lub semi-crystalline khoom PP yuav dheev liquefy thaum nws mus txog rau lub ntsiab lus melting.
Hauv qhov kev sim no, cov khoom hloov maj mam ntawm PP yuav yog vim qhov muag muag ntawm cov khoom no. Kev hloov pauv ceev nrawm ntawm PC yuav tshwm sim los ntawm lub amplitude tsis nyob hauv qhov tseeb. Cov kev sim txuas ntxiv yog xav tau, xws li nce rau PC ntau qhov ntau, lossis ntsuas qhov ntsuas kub ntawm lub weld seam.
Xaus Qhov haujlwm no muab cov qauv kev sim thiab cov qauv rau kev txiav txim siab qhov tsawg kawg uas yuav tsum tau ua rau plastics. Lub zog sib txheeb ntawm cov khoom melting lub sijhawm thiab qhov loj me thiab vuam lub zog tseem qhia tau tias qhov no ntawm kev kwv yees qhov tsawg kawg yuav tsum tau muaj ntau zaus yog ua tau.
