Screw ndiye gawo lofunika kwambiri laextruder, Tinganene kuti mtima wa extruder, zingakhudze mwachindunji ntchito extruder ndi kupanga dzuwa.Kuchita kwa screw kumatsimikizira zokolola, mtundu wa plasticizing, kubalalitsidwa kwa zodzaza, kutentha kwasungunuka ndi kugwiritsa ntchito mphamvu kwa extruder.
Screw ndi mbali yofunika kwambiri ya extruder, tinganene kuti mtima wa extruder, zingakhudze mwachindunji ntchito extruder ndi dzuwa kupanga.Kuchita kwa screw kumatsimikizira zokolola, mtundu wa plasticizing, kubalalitsidwa kwa zodzaza, kutentha kwasungunuka ndi kugwiritsa ntchito mphamvu kwa extruder.Kupyolera mu kuzungulira kwa screw, thepulasitiki polima akhoza extruded, ndipo pulasitikiyo imatha kusuntha, kukakamiza ndi kupeza kutentha pang'ono chifukwa cha kukangana kwa silinda.Pakusuntha kwa silinda, pulasitiki imatha kusakanikirana ndi kupangidwa ndi pulasitiki.
- 1.The wononga dongosolo la polima plasticizing ndi kusakaniza extruder.
Panthawi yokonza, zinthuzo zikapita patsogolo pa screw, zimakhala ndi kusintha kwa kutentha, kupanikizika, kukhuthala, ndi zina zotero, zomwe zimakhala zosiyana mkati mwa kutalika kwa screw.Pali zigawo zitatu zakuthupi za pulasitiki ya polima mu extruder: mawonekedwe agalasi, malo otanuka kwambiri komanso mawonekedwe otuluka a viscous.Kuti mugwirizane ndi zofunikira za mayiko osiyanasiyana komanso malinga ndi kusintha kwa zinthu, wonongazo zikhoza kugawidwa m'magawo atatu: gawo la chakudya, gawo la compress ndi gawo la homogenize.Ntchito ya gawo lodyetsa ndikudyetsa zinthu zomwe zimaperekedwa ndi hopper ku gawo loponderezedwa.Pakusuntha kwa pulasitiki, nthawi zambiri imakhala yolimba ndipo imasungunuka pang'ono chifukwa cha kutentha.Kutalika kwa gawo lodyetserako kumasiyana ndi mtundu wa pulasitiki.psinjika gawo (kutengerapo gawo) ndi udindo wa kupanikizika zakuthupi zakuthupi, kotero kuti zakuthupi kuchokera olimba kukhala osungunuka, bwino kunja kwa mpweya mu zakuthupi;Kuti agwirizane ndi makhalidwe kuchepetsa voliyumu pamene akukankhira mpweya zinthu kubwerera ku gawo kudyetsa, kukanikiza zakuthupi ndi kusungunula zakuthupi, wononga mu gawoli ayenera kutulutsa kwambiri kumeta ubweya zotsatira ndi psinjika pulasitiki.Ntchito ya gawo la homogenizing (gawo la metering) ndi kudyetsa zinthu zosungunuka kumutu wa makina nthawi zonse (voliyumu) ndi kupanikizika kotero kuti zimapangidwira mkamwa.Voliyumu ya spiral poyambira mu gawo la homogenizing ndi yofanana ndi yomwe ili mu gawo lodyetsa.
Pofuna kupewa kusunga zinthu kumapeto kwa wononga mutu wakufa ngodya, kuchititsa kuwonongeka, wononga mutu nthawi zambiri lakonzedwa mu chulucho kapena semicircle;Gawo lina la wononga homogenization ndi - pamwamba ndi thupi losalala kwambiri lotchedwa mutu wa torpedo, koma palinso zojambulajambula kapena mphero.Mutu wa torpedo umakhala ndi ntchito yolimbikitsa ndikuwongolera zinthu, kuchotsa chodabwitsa cha pulsating (pulsating) mukuyenda, kuchepetsa makulidwe a zinthu zosanjikiza ndikuwonjezera kukakamiza kwazinthu, kuwongolera kutentha, ndikuwonjezera kuwongolera bwino kwa pulasitiki. .Malinga ndi chiphunzitso cha Sungunulani zoyendera, Sungunulani umayenda mu wononga wononga homogenization gawo mu mitundu inayi, ndi otaya zinthu zosungunuka mu wononga poyambira ndi osakaniza anayi otaya izi: positive otaya - pulasitiki Sungunulani umayenda pakati ya silinda ndi wononga mu malangizo. cha screw groove kumutu wa makina.Counter-current flow direction ndi yosiyana ndi kuyenda kwabwino, komwe kumachitika chifukwa cha kupanikizika kwa mphuno, porous plate ndi fyuluta mbale.Mayendedwe a Sungunulani mu malangizo perpendicular kwa ulusi khoma zimakhudza kusakaniza ndi kutentha kuwombola kusungunuka pa extrusion.Kutaya kwamadzi - kubwerera kumbuyo komwe kumapangidwa ndi kuthamanga kwapakati pakati pa screw ndi silinda, motsatira njira ya axial ya screw.Mayendedwe osiyanasiyana ali ndi zotsatira zofunikira pakusakanikirana kofanana kwa ma polima.
Screw m'mimba mwake ndi kutsimikiza kwa mawonekedwe omangika, makamaka malinga ndi kupanga kwazinthu, mawonekedwe, mitundu yazinthu zosinthidwa ndi mawonekedwe osiyanasiyana opangira wononga kuti adziwe.Nthawi zambiri, gawo lodyetsera la wononga limakhala ndi poyambira mozama ndipo kuya kwake sikusinthika, gawo loponderezana (gawo losungunula) la screw groove kuya motsatira njira yotulutsira kuchokera kukuya kupita kukuya, gawo la mita (gawo lopangidwa ndi homogenized) la screw. ali ndi poyambira osaya ndipo kuya kwake sikusintha.
- 2. The screw material.
Screw ndi mbali yofunika ya extruder, monga zinthu wononga wononga kukana kutentha, kuvala kukana, kukana dzimbiri, mphamvu mkulu ndi makhalidwe ena, pa nthawi yomweyo ayenera kukhala bwino kudula ntchito, kutentha mankhwala otsalira nkhawa, mapindikidwe ang'onoang'ono matenthedwe ndi makhalidwe ena.Pakuti extruder wononga zinthu, pali zofunika motere:
- (1) .High makina katundu.Kukhala ndi mphamvu zokwanira, kuti azolowere kutentha, mkulu mavuto ntchito zinthu, kusintha moyo utumiki wononga.
- (2).Kuchita bwino kwa makina.Kuchita bwino kwa Machining ndi ntchito yochizira kutentha.
- (3) .Zimbiri zabwino ndi kuvala kukana.
- (4).Zosavuta kujambula.
Nthawi yotumiza: Jul-15-2019