Okulandelayo yizimiso ezibalulekile okufanele uzikhumbule mayelana ne-extrusion.Kufanele basize ukonga imali, bakhiqize imikhiqizo yekhwalithi ephezulu, futhi basebenzise izinto zokusebenza ngokuphumelelayo.
1. Isimiso somshini.Izinsimbi eziyisisekelo zokukhipha i-extrusion zilula—isikulufu sijika emgqonyeni bese siphushela ipulasitiki phambili.Isikulufu siyindiza ethambekile, noma irempu, ezungeze umgogodla omaphakathi.Inhloso iwukuphindaphinda amandla ukuze kunqotshwe ukumelana okukhulu.Endabeni ye-extruder, kukhona ukumelana okuthathu okufanele kunqotshwe: ukuhlikihlwa kwezinhlayiya eziqinile (okuphakelayo) odongeni lomgqomo kanye nokunye ekuphendukeni okumbalwa kokuqala kwesikulufu (indawo yokuphakelayo);ukunamathela kokuncibilika odongeni lomgqomo;kanye nokumelana nokugeleza ngaphakathi kokuncibilika njengoba kuqhutshelwa phambili.
USir Isaac Newton wachaza-ed ukuthi uma into ingahambi ngendlela ethile, amandla akuyo alinganisela kuleyo ndlela.Isikulufu asihambi siye ku-axial, nakuba singase sijike ngokushesha sibheke esiphambanweni esizungeze umzuliswano.Ngakho-ke, amandla e-axial ku-screw abhalansile, futhi uma iphokophela phambili ngamandla amakhulu ekuncibilikeni kwepulasitiki kufanele ihlehle emuva kokuthile ngamandla alinganayo.Kulokhu, iphusha i-bearing ngemuva kwe-feed entry ebizwa ngokuthi i-thrust bear.
Izikulufu eziningi ziwuchungechunge olungakwesokudla, njengezikulufu namabhawudi asetshenziswa ekubazeni nasemishinini.Bajika ngokuphambene -ngokwewashi, uma bebukwa ngemuva, njengoba bezama ukuzikrufunela bahlehle umgqomo.Kwamanye ama-twin-screw extruder, izikulufu ezimbili ziphenduka zibheke ezinhlangothini eziphambene emgqonyeni ophindwe kabili kanye ne-intermesh, ukuze esinye sibe kwesokudla futhi esinye sibe kwesokunxele.Kwezinye izikulufu ezingamawele ahlanganayo, zombili izikulufu ziphendukela ohlangothini olufanayo ngakho-ke kufanele zibe nokuma okufanayo.Nokho, kuzo zonke izimo, kukhona ama-thrust bearings ukuthatha amandla okubuyela emuva, futhi isimiso sikaNewton sisasebenza.
2. Isimiso sokushisa.Amapulastiki akhishwayo amapulasitiki e-thermoplastic—ancibilika lapho eshiselwa futhi aqine futhi lapho esepholile.Kuvelaphi ukushisa okuncibilikisa amapulasitiki?Ukushisisa okuphakelayo kanye nezifudumezi zomgqomo/zokufa kungase kube nomthelela, futhi kubalulekile ekuqaleni, kodwa okokufaka kwamandla emoto - ukushisa okungqubuzanayo okukhiqizwa ngaphakathi komgqomo njengoba injini iphendula isikulufu ngokumelene nokumelana nokuncibilika kwe-viscous—kuwumthombo wokushisa obaluleke kakhulu. kukho konke ngaphandle kwamasistimu amancane kakhulu, izikulufu ezihamba kancane, amapulasitiki ancibilika kakhulu -amazinga okushisa aphezulu, kanye nezicelo zokumboza nge-extrusion.
Kuyo yonke eminye imisebenzi, kubalulekile ukuqaphela ukuthi izifudumezi zomgqomo aziwona umthombo oyinhloko wokushisa ngesikhathi sokusebenza, ngakho-ke zinomthelela omncane ekukhishweni kunalokho esingase sikulindele.Izinga lokushisa elingemuva lomgqomo lingase lihlale libalulekile ngoba lithinta ukulunywa, noma izinga lokuqinile elidluliswayo ekuphakeleni.Amazinga okushisa ekhanda noma efa ngokujwayelekile kufanele abe ngaphansi noma eduze kwezinga lokushisa elifunekayo, ngaphandle uma esetshenziselwa injongo ethile efana nokucwebezela, ukusatshalaliswa kokugeleza, noma ukulawula ukucindezela.
3. Isimiso sokunciphisa isivinini.Ezikhiqizweni eziningi, isivinini sesikulufa sishintshwa ngokushintsha isivinini semoto.Izinjini zivame ukujika cishe ku-1750 rpm ngesivinini esigcwele, kodwa lokhu kushesha kakhulu ngesikulufu se-extruder.Uma ibiphendulwa ngokushesha ngaleyo ndlela, ibizokhipha ukushisa okungqubuzanayo okuningi, futhi isikhathi sokuhlala sepulasitiki singaba sifushane kakhulu ukuze kulungiselelwe ukuncibilika okufanayo, okuxutshwe kahle.Isilinganiso sokunciphisa esijwayelekile siphakathi kuka-10:1 no-20:1.Isigaba sokuqala singasebenzisa amagiya noma isethi ye-pulley, kodwa isigaba sesibili sihlale sisebenzisa amagiya futhi isikulufu sibekwe phakathi nendawo yokugcina, enkulu.
Emishinini embalwa ehamba kancane (njengamawele e-UPVC), kungase kube nezigaba ezintathu zokunciphisa, futhi isivinini esiphezulu singase sibe ngaphansi ku-30 rpm noma ngaphansi (ngezilinganiso ezifika ku-60: 1).Ngakolunye uhlangothi, amawele amade kakhulu asetshenziselwa ukuhlanganiswa angase asebenze ku-600 rpm noma ngaphezulu, ukuze kuncishiswe isilinganiso esiphansi kakhulu, kanye nokupholisa okukhulu kakhulu.
Ngezinye izikhathi isilinganiso sokunciphisa asifani nomsebenzi—kukhona amandla ahamba engasetshenziswa—futhi kungenzeka ukwengeza isethi yama-pulleys phakathi kwemoto kanye nesiteji sokuqala sokunciphisa ukuze ushintshe ijubane eliphezulu.Lokhu kungase kukhuphule isivinini sesikulufu ngaphezu kwemikhawulo yangaphambili noma kunciphisa isivinini esiphezulu ukuze kuvunyelwe isistimu ukuthi isebenze ngephesenti elikhulu laleso sivinini esiphezulu.Lokhu kwandisa amandla atholakalayo, kunciphisa i-amperage, futhi kugwema izinkinga zemoto.Kuzo zombili izimo, okukhiphayo kungase kunyuswe, kuye ngezinto kanye nezidingo zokupholisa.
Isikhathi sokuthumela: May-04-2017