Wadannan mahimman ka'idoji ne da ya kamata a kiyaye su game da extrusion.Ya kamata su taimaka wajen adana kuɗi, samar da samfurori masu inganci, da amfani da kayan aiki da kyau.
1. The inji ka'idar.Ainihin makanikai na extrusion ne mai sauki-mai dunƙule juya a cikin ganga da kuma tura da filastik gaba.Screw da gaske jirgin sama ne mai karkata, ko gangare, rauni a kusa da tsakiyar tsakiya.Manufar ita ce a ninka karfi ta yadda za a iya shawo kan babban juriya.A cikin yanayin extruder, akwai juriya guda uku don cin nasara: shafan tsayayyen barbashi (abincin) akan bangon ganga da juna a farkon 'yan juyawa na dunƙule (yankin ciyarwa);adhesion na narkewa zuwa bangon ganga;da juriya don gudana a cikin narke yayin da ake tura shi gaba.
Sir Isaac Newton ya bayyana-ed cewa idan wani abu ba ya tafiya a cikin wani wuri da aka bayar, da sojojin da ke kan shi suna da daidaito a cikin wannan hanya.Ƙunƙarar ba ta motsawa ta hanyar axial, ko da yake yana iya jujjuyawa da sauri a cikin hanyar giciye kewaye da kewaye.Don haka, dakarun axial a kan dunƙule suna daidaitawa, kuma idan yana ci gaba da gaba da karfi a kan narke filastik dole ne ya koma baya akan wani abu tare da karfi daidai.A wannan yanayin, yana turawa a kan wani matsayi a bayan shigarwar ciyarwa da ake kira ƙaddamar da turawa.
Yawancin dunƙule guda ɗaya zaren hannun dama ne, kamar sukullun da kusoshi da ake amfani da su a aikin kafinta da injina.Suna jujjuya agogo baya, idan an duba su daga baya, yayin da suke ƙoƙarin murƙushe kansu da baya ganga.A cikin wasu tagwayen-screw extruders, screws biyu suna juya gaba da gaba a cikin ganga biyu da tsaka-tsaki, ta yadda daya dole ne ya zama hannun dama, ɗayan kuma na hagu.A cikin sauran intermeshing tagwaye - sukurori, duka sukurori juya a hanya guda don haka dole ne su kasance da daidaito iri ɗaya.A kowane hali, duk da haka, akwai ƙwaƙƙwaran matsawa don ɗaukar ƙarfin baya, kuma ƙa'idar Newton har yanzu tana aiki.
2. The thermal ka'idar.Extrudable robobi ne thermoplastics-sun narke lokacin da mai tsanani da kuma zama m sake a lokacin da sanyaya.Ina zafin narkar da robobi ya fito?Ciyarwar preheating da ganga/mutuwar dumama na iya ba da gudummawa, kuma suna da mahimmanci a farawa, amma shigar da makamashin motsa jiki - zafi mai zafi da aka haifar a cikin ganga yayin da motar ke juyar da dunƙule a kan juriya na narkewar ɗanɗano - shine mafi nisa tushen zafi. ga kowa da kowa sai ƙananan tsarin, jinkirin motsa jiki, manyan robobi na zafi mai zafi, da kuma extrusion-coating aikace-aikace.
Ga duk sauran ayyuka, yana da mahimmanci a gane cewa masu dumama ganga ba su ne tushen zafi na farko a lokacin aiki ba, don haka suna da ƙarancin tasiri akan extrusion fiye da yadda muke tsammani.Zazzabin ganga na baya na iya kasancewa da mahimmanci saboda yana shafar cizo, ko adadin daskararrun isar da abinci.Yanayin zafi na kai da na mutu ya kamata ya kasance a kusa ko kusa da zafin narke da ake so, sai dai idan an yi amfani da su don takamaiman manufa kamar sheki, rarraba kwarara, ko sarrafa matsi.
3. Ka'idar rage saurin gudu.A mafi yawan masu fitar da kaya, ana canza saurin gudu ta hanyar canza saurin mota.Motoci yawanci suna juyawa a kusa da 1750 rpm a cikakken gudu, amma wannan yana da sauri da yawa don dunƙule extruder.Idan an juya shi da sauri, zai haifar da zafi mai yawa, kuma lokacin zama na filastik zai zama gajere don shirya rigar uniform, narke mai kyau.Matsakaicin raguwa na yau da kullun shine tsakanin 10:1 da 20:1.Mataki na farko na iya amfani da ko dai gears ko saitin ja, amma mataki na biyu koyaushe yana amfani da gears kuma an saita dunƙule a tsakiyar na ƙarshe, babban kaya.
A cikin ƴan na'urori masu motsi a hankali (kamar tagwaye don UPVC), za'a iya samun matakai uku na raguwa, kuma babban gudun zai iya zama ƙasa da 30 rpm ko ƙasa da haka (tare da ma'auni har zuwa 60: 1).A gefe guda kuma, wasu tagwaye masu tsayi masu tsayi da ake amfani da su don haɗawa suna iya gudu a 600 rpm ko fiye, don haka ana buƙatar ragi mai ragi sosai, da kuma sanyaya mai yawa.
Wani lokaci rabon raguwa ba ya daidaita da aikin-akwai ikon da ba a yi amfani da shi ba-kuma yana yiwuwa a ƙara saitin abubuwan jan hankali tsakanin motar da matakin raguwa na farko don canza babban gudun.Wannan ko dai yana ƙara saurin dunƙulewa fiye da iyakokin da suka gabata ko kuma rage saurin gudu don ba da damar tsarin ya yi aiki a mafi girman kashi na wannan babban gudun.Wannan yana ƙara ƙarfin samuwa, yana rage amperage, kuma yana guje wa matsalolin mota.A lokuta biyu, ana iya ƙara fitarwa, dangane da kayan da buƙatun sanyaya.
Lokacin aikawa: Mayu-04-2017