Screw yeyona ndawo ibalulekileyoi-extruder, kunokuthiwa yintliziyo ye-extruder, inokuchaphazela ngokuthe ngqo ukusetyenziswa kwe-extruder kunye nokusebenza kakuhle kwemveliso.Ukusebenza kwe-screw kuqinisekisa imveliso, umgangatho weplastiki, ukusasazwa kwefayili, ubushushu obunyibilikayo kunye nokusetyenziswa kwamandla e-extruder.
I-Screw iyona nto ibaluleke kakhulu kwi-extruder, kunokuthiwa yintliziyo ye-extruder, inokuchaphazela ngokuthe ngqo ukusetyenziswa kwe-extruder kunye nokusebenza kakuhle kwemveliso.Ukusebenza kwe-screw kuqinisekisa imveliso, umgangatho weplastiki, ukusasazwa kwefayili, ubushushu obunyibilikayo kunye nokusetyenziswa kwamandla e-extruder.Ngokujikeleza isijivu, iiplastiki yepolymer inokukhutshwa, kwaye iplastiki inokuhamba, icinezele kwaye ifumane ubushushu obuthile kwi-friction kwi-cylinder.Ngethuba lokuhamba kwe-cylinder, iplastiki inokuxutywa kunye neplastiki.
- 1.Isakhiwo se-screw se-polymer plasticizing kunye nokuxuba i-extruder.
Ngexesha lokucubungula, xa izinto zihamba phambili kunye ne-screw, zifumana utshintsho kwiqondo lokushisa, uxinzelelo, i-viscosity, njl., ezahlukeneyo phakathi kobude obupheleleyo be-screw.Kukho iimeko ezintathu ezibonakalayo zeplastiki yepolymer kwi-extruder: imo yeglasi, imeko ephezulu ye-elastic kunye ne-viscous flow flow.Ukuze ulungelelanise iimfuno zamazwe ahlukeneyo kwaye ngokweempawu eziguqukayo zezinto eziphathekayo, i-screw ingahlulwa ibe ngamacandelo amathathu: icandelo lokutya, icandelo le-compress kunye necandelo le-homogenize.Umsebenzi wecandelo lokutya kukutya izinto ezibonelelwa yi-hopper kwicandelo loxinzelelo.Ngexesha lokuhamba kweplastiki, ngokuqhelekileyo ihlala iqinile kwaye inyibilika ngokuyinxenye ngenxa yobushushu.Ubude becandelo lokutya buhluka ngohlobo lweplastiki.Icandelo lokunyanzeliswa (icandelo lokutshintshela) yindima yoxinzelelo lwezinto eziphathekayo, ukwenzela ukuba izinto ezivela kwi-slid zibe zityhidiweyo, ziphume kakuhle emoyeni kwizinto eziphathekayo;Ukuze ulungelelanise iimpawu zokunciphisa umthamo xa utyhala igesi kwizinto ezibuyela kwicandelo lokutya, ucinezela izinto kunye nokunyibilika kwezinto, i-screw kweli candelo kufuneka ivelise impembelelo enkulu yokucheba kunye nokunyanzeliswa kweplastiki.Umsebenzi wecandelo le-homogenizing (icandelo le-metering) kukutya izinto ezityhidiweyo kwintloko yomatshini kwivolumu eqhubekayo (ivolumu) kunye noxinzelelo ukwenzela ukuba yenziwe kwi-mold yomlomo.Umthamo we-spiral groove kwicandelo le-homogenizing iyafana naleyo kwicandelo lokutya.
Ukuze ugweme ukugcinwa kwezinto ezibonakalayo ekupheleni kwekona efileyo ye-screw, ebangela ukubola, intloko ye-screw ihlala iyilwe ibe yi-cone okanye i-semicircle;Elinye icandelo le-screw homogenization lilo - umphezulu ngumzimba ogudileyo ngokupheleleyo obizwa ngokuba yintloko ye-torpedo, kodwa kukwakho nemikrolo ekroliweyo okanye iipateni zokusila.Intloko ye-torpedo inomsebenzi wokuvuselela kunye nokulawula izinto eziphathekayo, ukuphelisa i-pulsating (pulsating) isenzeko ekuhambeni, ukunciphisa ubukhulu bomgangatho wezinto eziphathekayo kunye nokunyusa uxinzelelo lwezinto eziphathekayo, ukuphucula imeko yokufudumala, kunye nokuphucula ngakumbi i-screw plasticizing esebenzayo. .Ngokutsho kwethiyori yothutho yokunyibilika, ukunyibilika kugeleza kwicandelo le-screw homogenization ngeendlela ezine, kunye nokuhamba kwezinto ezityhidiweyo kwi-screw groove yindibaniselwano yezi zityhutyha ezine: ukuhamba kakuhle - iplastiki iyanyibilika ihamba phakathi kwe-cylinder kunye ne-screw kwicala. ye-screw groove ukuya kwintloko yomatshini.I-counter-current flow direction ichasene nokuhamba okulungileyo, okubangelwa i-gradient yoxinzelelo olubangelwa ukuchasana kwempumlo, i-porous plate kunye ne-filter plate.Ukuhamba kwe-melt kwi-direction perpendicular to the thread thread kuchaphazela ukuxuba kunye nokutshintshwa kobushushu be-melted ngexesha lokukhupha.Ukuvuza kokuhamba - ukuhamba ngasemva okwenziwe yi-gradient yoxinzelelo phakathi kwe-screw kunye ne-cylinder, ecaleni kwe-axial direction of screw.Iipateni ezahlukeneyo zokuhamba zineempembelelo ezibalulekileyo ekuxubeni okufanayo kweepholima.
I-Screw diameter kunye nokumiselwa kwefom yolwakhiwo, ubukhulu becala ngokwemveliso yemveliso yemveliso, iinkcukacha, iintlobo zemathiriyeli esetyenzisiweyo kunye neempawu ezahlukeneyo ze-screw zesakhiwo ukumisela.Ngokubanzi, icandelo lokutyisa lesikrufu linomsele onzulu kwaye ubunzulu begroove abutshintshanga, icandelo locinezelo (icandelo lokunyibilika) lobunzulu be-screw groove ecaleni kwendlela yokukhupha ukusuka kubunzulu ukuya kubunzulu, icandelo lokulinganisa (icandelo le-homogenized) lesikrufu. inomsele ongenzulu kwaye ubunzulu bomsele abutshintshanga.
- 2.Isixhobo sokujija.
I-Screw iyona nxalenye ephambili ye-extruder, njengoko izinto ze-screw kufuneka zibe nokumelana nobushushu obuphezulu, ukumelana nokunxiba, ukumelana nokugqwala, amandla aphezulu kunye nezinye iimpawu, kwangaxeshanye kufuneka kube nokusebenza kakuhle kokusika, uxinzelelo olushiyekileyo lonyango lobushushu, i-deformation encinci ye-thermal kunye ezinye iimpawu.Kwizinto ze-scruder screw, kukho iimfuno ezithile ngolu hlobo lulandelayo:
- (1) .Iipropati zomatshini eziphezulu.Ukuba namandla okwaneleyo, ukulungelelanisa ukushisa okuphezulu, iimeko zokusebenza zoxinzelelo oluphezulu, ukuphucula ubomi benkonzo ye-screw.
- (2) .Ukusebenza kakuhle komatshini.Ukusebenza kakuhle komatshini kunye nokusebenza kwonyango lobushushu.
- (3) .I-corrosion enhle kunye nokumelana nokunxiba.
- (4).Kulula ukuzoba.
Ixesha lokuposa: Jul-15-2019