0 Isingeniso
Umshini wokubumba umjovo uyisisetshenziswa esiyinhloko sokubumba ipulasitiki, ikakhulukazi ngohlelo lomjovo.Isistimu, uhlelo lwe-clamping, uhlelo lokulawula ugesi, uhlelo lokuthambisa, i-hydrostatic transmission system,Isistimu yokushisisa nokupholisa, uhlelo lokuqapha ukuphepha, njll. Ukuthuthukisa ikhwalithi yomkhiqizoUbuningi, ukusebenza kahle kokukhiqiza, ukunciphisa ukusetshenziswa kwamandla, abantu benze ucwaningo olunzulu ngayo.Ucwaningo ngemishini yokubumba umjovo luningi, kuhlanganise nesistimu yokulawula ugesi.Inguquko ehlakaniphile.Ukuguqulwa kwe-Servo yesistimu yokudlulisa Ukonga amandla omshini wokushisisa nokupholisaReform.I-screw structure transformation of plasticizing ikhono. Isikulufu siwumgogodla womshini wokubumba umjovo Izingxenye zenhliziyo, amapharamitha awo anquma umthamo womjovo womshini womjovo, abacwaningi baye bafundaOkwengeziwe. Ukufana okungcono kwepulasitiki kwesikulufu kumelela ukunemba kokuphindaphinda komkhiqizo.Kuya phezulu ukunemba kokulinganisa, ipharamitha yokusebenza ye-plasticizing uniformity ibonakala i-viscosity.Lapho ukuguqulwa kwesakhiwo sesikulufa kusiza ukunciphisa ukubonakala kwe-viscosity yokuncibilika., isikulufu.
Umthamo unqunywa isakhiwo sesikulufu kanye nesivinini sesikulufu, ingcindezi, isivinini, izinga lokushisa, njll.Kuyipharamitha eyinhloko yokukala ukusebenza kwesikulufu. U-Wang XishUkuncibilika komjovo wokuthuthwa kwe-screwBody kwahlaziywa ngokwethiyori. U-Li Zhenget Imiphumela yokushisa nokucindezela emuva kumnenkeUmthelela wekhono lenduku yokwenza ipulasitiki. Umthamo we-Plasticizing umele ukusebenza kahle kokukhiqizwa komshini wokubumba umjovo,Kuyadingeka ukuthuthukisa ikhono plasticizing isikulufa izinzuzo zomnotho amabhizinisi.
Ikhono le-plasticizing lenduku libhekisela kwikhwalithi yezinto ezenziwe ngepulasitiki ngesikhathi seyunithi ngayinye yesikulufu somshini wokubumba umjovo.Ikhwalithi yokugcina impahla inqunywa igumbi lokulinganisa., kanye nokuphuma kwesigaba se-screw homogenizationKuxhunywe negumbi lokulinganisa, ivolumu ekuphumeni kwesigaba se-screw homogenizing ingalinganiswa.Ikhono lokwenza ipulasitiki lesikulufu lanqunywa izinga lokuphasa.Ekukhethweni kwezinto ezibonakalayo., i-viscosity ithintwa kakhulu izinga lokugunda kanye nezinga lokushisaIzinga lokuzwela okuphansi kwe-polypropylene ukuze kube lula ukutholwa nokubhekwa kwemiphumela yokuhlola. Leli phephaInkambu yokugeleza ye-PP encibilikayo engxenyeni ye-homogenizing yesikulufu ihlaziywa nge-Fluent software..
Ukusebenzisa indlela yocwaningo yokuhlanganisa ukuhlolwa kanye nokuhlaziywa kwethiyori, ukujikeleza kwesikulufa
Imithelela yokushona kwesikulufu okuhlukene kuzinga lokushisa, i-viscosity ebonakalayo, isivinini kanye nekhono lokwenza ipulasitikiIzinga lokuphasa kwe-volumetric ekuphumeni kwesigaba se-screw homogenizing liyahlaziywa ukuze kukhuliswe isivinini se-Screw sepharamitha yokukhiqiza umshini wokubumba umjovo.
1 Ukuhlaziywa kwethiyoriKuleli phepha, i-homogenization yomshini wokubumba umjovo wepulasitiki we-LYH680 ufaniswe yi-Fluent.Isigaba soketshezi lwamapayipi, setha isivinini se-screw esihlukile, Ukuhlaziywa kwesigaba se-homogenization yepayipiIzinga lokuhamba levolumu lapho kuphuma khona ingxenye ye-propylene fluid homogenization liyatholwa.I-viscosity esobala ye-PP encibilikayo kanye nekhono lokwenza ipulasitiki lesikulufu kwaphenywa.. Isigaba somshini wokubumba umjovoImingcele efanele yile: ubude besigaba se-homogenized sesikulufu 80 mm, futhi izinga lokushisa lomgqomo esigabeni se-homogenizing isethweSetha ku 220 C, ingcindezi ncibilika esigabeni homogenizing kuyinto 1.5 I-MPa, futhi ukujula kwe-screw groove ngu-2.2Mm, i-screw angle angle 17.66 °, Isikulufu ubude-nobubanzi isilinganiso kuyinto 19.6, isikulufu ububanzi 32 mm; Ukuncibilika kokuncibilika kwe-polypropylene (PP) kwaba 770 kg / m3Indawo yokuncibilika yi 170 °C, i-thermal conductivity coefficient yokuncibilika ngu-0.182W / (m · °C), kanye nesilinganiso sokuncibilikaUmthamo wokushisa we 2900 J / (kg · C), ncibilikisa i-viscosity ye 421 Pa · s (453 K / 320)Pa·s (463 K)/250 Pa·s (473 K)。 Kubunjiniyela obusebenzayo, cabangela uketsheziUkuminyana kuyashintsha kancane ngenxa yokuthi i-polymer encibilikisiwe igundwa emshinini wokubumba umjovo uma ibunjiwe ngaphambili. 10-3 m / s, ngaleso sikhathi ukuncibilika kutholakala endaweni engeyona eye-Newtonian rheological yokuqala Kulesi sifunda, i-polymer encibilikayo ingathathwa njengoketshezi lwe-Newtonian, ngakho-ke i-PP melt ithathwa njenge-laminar engenakucindezelwa i-Newtons fluid ekuhlaziyweni kokuhlolwa kwethiyori nokuhlola..
Ishaneli yasekuqaleni ezungezayo lapho okudlula khona kunwetshwa kushaneli eyi-cuboid,Imodeli yesikhala enezinhlangothi ezintathu eyakhiwe kusukela emsuka iboniswa kuMdwebo 1 kuFigure 3.
1.2 Ukusungulwa kwe-Fluid Governing Equation (Phi) + i-div (p f) = div (γ gradphi) + S. (1) Lapho u-φ kuwukuguquguquka komzimba okujwayelekile; I-generalized diffusion coefficient ehambelana ne-phi; U-S igama lomthombo ojwayelekile.
Ngokwendlela ye-Guangyi, i-equation yokongiwa kwesisindo kanye nomfutho kumiswa emnyango wesigaba se-homogenization sendiza ye-x-y (z = 0).
I-dV
r
Z = – kwe Pb + p F + δ V.
(2) Kufomula ye-dt: rho ukuminyana okuncibilikayo, kg / m3; I-Vz yijubane lokugeleza ku-z direction, m / s, ukungena ku-spiral groove endaweni ye-homogenization; F ukusheshisa kwamandla adonsela phansi, m / s2; I-Pb iyingcindezi yangemuva, Pa; Ingabe i-viscosity encibilikayo,
Pa·s; T isikhathi, s; ▽ i-Hamiltonian,▽= ∂ i+ ∂ j+ ∂ k。 ∂x ∂y ∂z
Isibalo (2) i-equilibrium equation yomfutho (N-S isibalo) uketshezi lwe-viscous, uketshezi olusemseleni ovunguzayo luthathwa njengokugeleza kwe-isothermal; Izinkambu ze-viscosity kanye nokuminyana zifana. Ububanzi bomsele ovunguzayo bukhulu kakhulu kunokujula kwe-spiral groove, futhi umphumela wodonga oluseceleni lwesikulufa awunakwa. Ukuncibilika kugeleza ngokugcwele kushaneli yesikulufu, ukuziba umphumela wokugeleza we-inlet ne-outlet, kodwa uma kucatshangelwa umphumela we-reverse back pressure. Isibalo se-N-S senziwe lula yimibandela engenhla:
2
dp
dy=1·b。 (3) eya dx
Hlanganisa y kabili bese unikeza izimo zemingcele (y = 0, vz = 0; Y = h, Vz = π NDcos theta / 60). Umsebenzi wesimo sokusabalalisa isivinini sokugeleza lapho uncibilika khona utholwa, leyo
NDyπ cos theta hy-y2pb
I-Vz = 120h – 2kanye × Lsintheta. (4)
Lapho u-h ewukujula kwesikulufu segroove esigabeni se-homogenization, m; I-engeli ye-helix yesikulufu, (°); L ubude bengxenye ye-homogenized, m; N isivinini sesikulufu, r a d / m ngi n; U-D uwububanzi obuqondile be-screw rod, m.
1.3 Ukubalwa komthamo we-plasticizing theory
Ukufaka esikhundleni se-Eq. (4) ku-flow definition equation, Q = WhVz = π DhVzsynthesizer, uyapha
22 32
Mpt = QÏ€ = Ï€ D NhÑ€sin θ cos θ – p Dhsin
Iphimbo. (5) 120 12 L lapho: U-W ububanzi besigaba soketshezi, m; I-MPT iyi-Theory Plastic Yomshini Wokubumba Umjovo Wepulasitiki Wohlobo Lwe-Screw
Umthamo wamakhemikhali, kg / s; U-Q izinga lokuphasa kwevolumu lesigaba sokuncibilika kwe-homogenization, m3 / s. Nge-equation (5), kungabonakala ukuthi ikhono le-plasticizing ye-screw lithinteka yizinhlobonhlobo zemingcele yenqubo efana nobubanzi be-screw, i-screw groove angle, ncibilikisa ukucindezela nokujula kwe-screw groove. Isivinini se-screw siphezulu, kunamandla ikhono plasticizing; Lapho i-viscosity ebonakalayo yokuncibilika iyanda, amandla e-plasticizing of screw ayanda.
Imiphumela yokuhlola nokuhlaziywa kokulingisa
2.1 Ukuhlaziywa kokulingisa kanye nemiphumela
1) Imibandela yokuhlaziywa kokulingisa.
Ubuso bokungena ngaphakathi: kusukela kumsebenzi wesimo sokusabalalisa isivinini ku-z isiqondiso sokuncibilika (njenge (4)), isivinini endaweni yokungena yesigaba se-homogenizing siyashintsha ngevelu engu-y. Manje N = 120, 140, 160, 180 i-rad / min zishintshwa zibe Vz ngokulandelana, kanye nesivinini esilingisiwe sokuqala esigudle isiqondiso sokuvunguza emnyango wesigaba se-homogenization sinqunywa ngencazelo yomsebenzi we-Fluent ngolimi lwayo lokuhlela i-UDF., leyo, isivinini sokuqala ngaphansi kwezimo ezilingisayo nezikaliwe; Ngoba ingcindezi yokuncibilika endaweni yokungena iphansi kakhulu kunokucindezela kwekhanda lesikulufa, ingcindezi ekungeneni kwesigaba se-homogenization 0; Ngokusho kwenqubo nemingcele ye-PP impahla kanye nemishini, i
Izinga lokushisa lokuncibilika lisethwe ukuze 465 K. Izindonga eziseceleni kwesokunxele nakwesokudla: y-z indiza (x = 0), (x kuyalingana 3.2 × 10-2 m) njengezigaba ze-homogenization
Izinhlangothi ezimbili zodonga lwesikulufu zisethwe njengezindonga ezingasheleli, futhi izinga lokushisa lokuncibilika liyizinga lokushisa lesikulufa, esethelwe ku 473 K ngokusho kwezimpawu ze-PP kanye nesimo sangempela semishini.
Izindonga ezisemaceleni ezingenhla nezingezansi: indiza ye-x-z (y = 0), (y = 2.2 × 10-3 m) njengezinhlangothi ezingezansi nezingaphezulu ze-screw groove yesigaba se-homogenization, uhlangothi olungezansi lubhekwa njengodonga olungasheleli, izinga lokushisa elincibilikayo yizinga lokushisa lesikulufa, futhi izinga lokushisa lisethwe ukuze 473 K ngokuya nezici ze-PP kanye nesimo sangempela semishini; Uhlangothi olungaphezulu lwe-screw groove esigabeni se-homogenization indawo yokuthintana yokuncibilika kanye nomgqomo., izinga lokuncibilika lokugeleza liphezulu, futhi izinga lokushisa lokuncibilika lilingana nezinga lokushisa lombhobho, esethelwe ku 493 K ngokwemibandela yokukhiqiza yezinto ze-PP.
Ubuso bokuphela kokuphuma: indiza ye-x (z = 0.264 m) njengendawo yokuphuma kwesigaba se-homogenization, umngcele wokuphuma kwengcindezi uyamukelwa, lapho ukucindezela kuphambene nesiqondiso sika-z, futhi ingcindezi isethelwe ukufanisa okokusebenza kokuhlola ukuze kube lula ukuhlaziya nokuqhathanisa, futhi ingcindezi yangemuva isethwe -1.2 I-MPa.
Okwe x = 0.01, umdwebo wejika wesivinini, izinga lokushisa kanye ne-viscosity ekuphumeni kwesigaba se-homogenization njengomsebenzi wokujula kwe-spiral groove kuboniswa ku-Figures. 4 ku 6.
Singabona kuFigure 4 lokho ngokwanda kwesivinini sesikulufa, isivinini sesigaba se-homogenization ekuphumeni siyanda, ngokukhula kokujula kwe-screw groove, ijubane liqala linciphe bese liyakhuphuka, okubangelwa amandla okugunda kanye ne-viscosity ezindaweni ezingaphezulu neziphansi ze-screw groove, ngokuhambisana noketshezi lwe-polymer epuletini.
Izinguquko phakathi. Njengoba sibona kuMfanekiso 4, ngokwanda kwesivinini sesikulufa, Isivinini ekuphumeni kwesigaba se-homogenizing siyakhuphuka. Ngokukhula kokujula kwe-groove, isivinini siyehla kuqala bese siyakhuphuka. Lokhu kungenxa yamandla amakhulu okugunda kanye ne-viscosity ezindaweni ezingaphezulu neziphansi ze-groove., okuhambisana nokushintshwa kwe-polymer fluid phakathi kwamapuleti. Ukushintsha kwezinga lokushisa esiqondisweni se-radial njengoba kuboniswe ku-FIG. 5. I-PP melt ixhumene nesikulufu esingezansi (y = 0), ngenhla ukuxhumana nesikulufu (y = 0.0022m) ukuqhutshwa kokushisa kwenzeka, ukushisa kusuka phansi, phezulu ku-ncibilike, izinga lokushisa elivela ezinhlangothini zombili libheke phansi, ukwakha ijika lokushisa eligobile. Ngokukhuphuka kwejubane lesikulufa, ijubane liyakhula, isikhathi sokushisa kumgijimi siyancipha, futhi izinga lokushisa liyehla ngokwanda kwenani lama-revolutions. Njengoba kuboniswe ku-FIG. 6, i-viscosity ebonakalayo yokuncibilika iyanda kuqala bese iyancipha ngokukhula kokuphakama okuvunguzayo, Ngokuphambene nejika lokushisa, i-viscosity ebonakalayo iphansi kakhulu phezulu kwezinga lokushisa eliphakeme kakhulu lokuncibilika, futhi i-viscosity ebonakalayo iphakeme kakhulu phakathi kwezinga lokushisa eliphansi lokuncibilika. Ngokukhuphuka kwejubane lesikulufa, i-viscosity ebonakalayo yokuncibilika iphezulu futhi iphakeme, futhi ukufana okubonakalayo kwe-viscosity kuncipha. Kuyabonakala ukuthi i-viscosity ebonakalayo ye-PP melt ilingana ngokuphambene nezinga lokushisa., okubonisa ukunemba kokulingisa.
Kungabonakala ku-Figure 6 ukuthi i-viscosity ayigxilile ekufanisweni kwe-Fluent, ngakho-ke sithatha i-viscosity evamile ekuphumeni kwesigaba se-homogenization ku-x = 0.01 lapha, ngoba i-viscosity iyashintsha lapha ngokuqhathanisa idatha.
I-viscosity eseduze kakhulu nesibalo setiyetha.
2.2 Isilinganiso kanye nokuhlaziywa kwamandla e-Plasticizing
Ngemuva kokushisa umshini wokubumba umjovo, i-polypropylene eluhlaza ifakwa kufaneli yepulasitiki. Amapharamitha wesivinini esijikelezayo sesikulufu asethwe kokuthi 120,140,160,180 rpm, izinga lokushisa kwesigaba homogenized isethwe at 220 °C, futhi ingcindezi yokuncibilika engxenyeni ye-homogenizing isethwe ku 1.2 I-MPa. Isikhathi sokugcina t ngesivinini ngasinye esizungezayo sirekhodwa ngesitophuwashi, bese kumiswa okuphakelayo okungenalutho.
Ngemuva komjovo, ngemva kokuba umjovo usupholile, ubukhulu bomjovo buqoqwa futhi bulinganiswe, futhi amandla wangempela okwenza ipulasitiki mps atholwe yi-mps = 1000m/t. Imiphumela yokuqhathanisa nekhono le-plasticizing ye-theoretical mpt ngaphansi kwezimo ezifanayo kukhonjiswe ku-Fig. 7.
Umfanekiso 7 ibonisa ukuthi umthamo we-plasticizing wetiyori kanye nesivinini sesikulufu sesikulufu silinganisa umsebenzi
Ngokukhuphuka kwejubane lesikulufa, ikhono le-plasticizing yesikulufu liyathuthukiswa, kanye nesikulufu sangempela
Ikhono le-Rod plasticizing liphansi kunekhono le-plasticizing elicatshangelwayo, ikhono langempela le-plasticizing lomshini wokubumba umjovo ngesivinini se 120 ~ 180 i-rad / ama-akhawunti amancane we 82% ~ 86% wekhono le-plasticizing theory, okubonisa ukuthi umshini wokubumba umjovo ikhono lokuhlanganisa isikulufu lingaphezu kwezinga eliphakathi. 2.3 Ukuhlaziywa kwephutha
Kunomehluko phakathi kwekhono langempela le-plasticizing kanye nekhono le-plasticizing yethiyori yesikulufu, akukho okudlula la maphuzu: 1) ingxenye yezinto yakha ifilimu encibilikisiwe ngesikhathi senqubo yokwenza ipulasitiki, okuholela ekuvuzeni kwempahla; 2) Ukuvuza komfutho we-spiral akuzange kucatshangelwe ekuhlaziyweni kwekhono le-plasticizing theory, okwenze ukuthi ezinye izinto zihlale onqenqemeni oluvunguzayo. 3) Ngaphezu kokushisa okudluliselwa yi-heater emgqonyeni, impahla ingaphezulu ekushiseni kwe-shear yesikulufu kanye nokungqubuzana phakathi kwezinto, okubangela ukubola okushisayo kwengxenye yezinto.
Ngokukhuphuka kwejubane lesikulufa, ikhono langempela le-plasticizing liyancipha, kukhona amaphuzu alandelayo: 1) Ngokukhuphuka kwejubane lesikulufa, ukushisa kwe-shear yesikulufu kuyanda, okubangela ukubola okushisayo kwengxenye yezinto; 2) Ukwanda kwezinga lokushisa kunciphisa i-viscosity yezinto, kwandisa ingcindezi ephambene, ivimbela ukuqhubeka kwento, futhi kubangela amandla e-plasticizing wangempela ukuthi ehle.
Isiphetho Ngokukhula kokujula kwe-screw groove, ukufana kwezinga lokushisa kanye ne-viscosity ebonakalayo yehla, futhi nekhono lokubeka ipulasitiki lenyuka, kodwa ukunemba kwekhwalithi yomkhiqizo kwehlile. Amandla okwenza ipulasitiki anda njengoba isivinini sesikulufa sikhula, kodwa ukufana kwezinga lokushisa kanye nokubonakala kwe-viscosity kwehla ngokunyuka kwesivinini sesikulufu. Ukwenyusa izinga lokushisa lesikulufu kusiza ukukhuthaza ukufana okubonakalayo kwe-viscosity futhi kuthuthukise ukunemba kwekhwalithi yomkhiqizo.; Ukuze kuqinisekiswe ikhwalithi yomkhiqizo futhi kuthuthukiswe ukusebenza kahle kokukhiqiza, ukujula, izinga lokushisa nesivinini sesikulufu kufanele sithuthukiswe.