Izvi zvinotevera misimboti yakakosha yekuchengeta mupfungwa nezve extrusion.Vanofanira kubatsira kuchengetedza mari, kuburitsa zvigadzirwa zvemhando yepamusoro, uye kushandisa michina nemazvo.
1. The mechanical musimboti.Makanika ekutanga eextrusion ari nyore-siruu inotenderera mudhiramu uye inosundira purasitiki kumberi.Sirufa indege yakarerekera, kana kuti rampu, yakatenderedzwa nepakati pepakati.Chinangwa ndechekuwanza simba kuitira kuti kurwisana kukuru kugone kukundwa.Panyaya yeextruder, pane zvitatu zvinopokana kuti zvikunde: kukwizwa kwezvimedu zvakasimba (chikafu) chinopesana nemadziro embiru uye mumwe nemumwe mukutanga kutendeuka kwescrew (nzvimbo yekudya);kunamatira kwekunyunguduka kumadziro embiru;uye kuramba kuyerera mukati mekunyunguduka sezvainosundidzirwa mberi.
Sir Isaac Newton vakatsanangura-ed kuti kana chinhu chisiri kufamba munzira yakapihwa, masimba ari pachiri anodzikama munzira iyoyo.Iyo screw haifambi munzira yeaxial, kunyangwe ingave ichitendeuka nekukurumidza munzira yekuyambuka yakatenderedza denderedzwa.Saka, maaxial forces ari pascrew akaenzana, uye kana iri kusunda mberi nesimba guru papurasitiki inonyunguduka inofanira kunge ichisundira kumashure pane chimwe chinhu chine simba rakaenzana.Muchiitiko ichi, iri kusunda pabearing kuseri kwechipfuyo chinopinda chinonzi thrust bearing.
Mazhinji masiruuru ishinda yekuruoko rwerudyi, senge screws nemabhaudhi anoshandiswa mukuveza nemichina.Vanofuratira -wachi, kana vakatariswa kubva kumashure, pavanenge vachiedza kuzvimonera neshure kunze kwedhiramu.Mune mamwe mapatya -screw extruder, maviri screws anotenderera akatarisana mudhiramu kaviri uye intermesh, kuitira kuti mumwe anofanira kunge ari kurudyi-uye mumwe kuruboshwe-ruoko.Mune imwe intermeshing twin -screws, ese ma screws anotenderera akananga kudivi rimwe uye nekudaro anofanirwa kuve neakaenzana.Muzviitiko zvese, zvisinei, pane zvinokurudzira kutora simba rekudzokera shure, uye nheyo yaNewton ichiri kushanda.
2. Thermal musimboti.Mapurasitiki anotakurika ari thermoplastics-anonyunguduka kana achipisa uye anove akasimba zvakare kana atonhodzwa.Iko kupisa kwekunyungudutsa mapurasitiki kunobva kupi?Kudyisa preheating uye mbiya / kufa heaters inogona kupa, uye yakakosha pakutanga, asi injini simba rekuisa - kupisa kunopisa kunogadzirwa mukati medhiramu sezvo mota ichitenderedza screw kupikisa kunyungudika kwe viscous - ndiyo inonyanya kukosha yekupisa. kune ese kunze kwemadiki masisitimu, anononoka-anofambisa screws, yakakwira -melt -temperature mapurasitiki, uye extrusion -coating application.
Kune mamwe maoperation ese, zvakakosha kuziva kuti mbiya dzinopisa hadzisi iyo yekutanga sosi yekupisa panguva yekushanda, uye nekudaro ine mhedzisiro shoma pane extrusion kupfuura yatingatarisira.Iyo yekumashure tembiricha yebhari inogona kuramba yakakosha nekuti inokanganisa kuruma, kana chiyero chezvakaoma zvinotakura muchikafu.Tembiricha yemusoro neyekufa inofanirwa kunge iri padyo kana padyo neinoda kunyunguduka tembiricha, kunze kwekunge ichishandiswa kune chimwe chinangwa senge gloss, kuyerera kwekuyerera, kana kudzora kumanikidza.
3. The speed reduction principle.In most extruders, screw speed inochinjwa nekugadzirisa motor speed.Mota dzinowanzo tenderera 1750 rpm nekumhanya kuzere, asi izvi zvinonyanya kukurumidza kune extruder screw.Dai yakashandurwa nekukurumidza kudaro, yaizoburitsa kupisa kwakanyanya, uye nguva yekugara yepurasitiki yaizove ipfupi kugadzirira yunifomu, yakasanganiswa yakanyungudika.Chiyero chekudzikisira chiri pakati pe10:1 ne20:1.Nhanho yekutanga inogona kushandisa chero magiya kana pulley seti, asi nhanho yechipiri inogara ichishandisa magiya uye screw yakaiswa pakati pekupedzisira, hombe giya.
Mumichina mishoma inofamba inononoka (senge mapatya eUPVC), panogona kunge paine matanho matatu ekudzikisa, uye kumhanya kwepamusoro kunogona kunge kwakadzikira se30 rpm kana kushomeka (ine reshiyo inosvika 60: 1).Kune rimwe divi rakanyanyisa, mamwe mapatya akareba anoshandiswa kusanganisa anogona kumhanya pa600 rpm kana kupfuura, kuitira kuti chiyero chakaderera chekudzikisa chinodiwa, pamwe nekutonhora kwakanyanya.
Dzimwe nguva chiyero chekudzikisa hachifananidzi kubasa-pane simba rinoenda risina kushandiswa-uye zvinokwanisika kuwedzera seti yemapulleys pakati pemotokari uye yekutanga kuderedza danho kuti uchinje kukurumidza kwepamusoro.Izvi zvinogona kuwedzera screw kumhanya kupfuura miganhu yekutanga kana kuderedza kumhanya kwepamusoro kubvumira sisitimu kuti imhanye pachikamu chikuru cheiyo yepamusoro kumhanya.Izvi zvinowedzera simba rinowanikwa, kuderedza amperage, uye kudzivirira matambudziko emota.Muzviitiko zviviri izvi, kubuda kunogona kuwedzerwa, zvichienderana nechinhu uye zvido zvayo zvekutonhora.
Nguva yekutumira: May-04-2017