Cov yam ntxwv cuam tshuam rau cov zis ntawm cov yas granulator

1, Kev ua haujlwm ntawm txhua ntu ntawm cov yas granulator
Cov zis ntawm yas granulator yog ze ze rau cov qauv ntawm cov yas granulator. Tam sim no, feem ntau siv extrusion txoj kev xav yog ua raws li peb txoj haujlwm yooj yim ntawm kev xa khoom, melting thiab metering. Yog li ntawd, ib tug zoo tib yam ntsia hlau muaj peb seem; Tshooj pub, seem compression thiab homogenization seem. Cov khoom noj khoom haus plays lub luag hauj lwm ntawm cov khoom conveying, seem compression plays lub luag hauj lwm ntawm yas melting thiab compression, thiab seem homogenization plays lub luag hauj lwm ntawm homogenization thiab metering.
In the feeding section, plastic is an unplasticized solid. Its solid transportation is based on the solid transportation theory, and its core is the solid friction theory. In this section, the solid transportation rate is related to the friction coefficient (fb) between the material and the screw surface and the friction coefficient (f) between the material and the barrel surface, when fb>f. Nws tuaj yeem txhim kho tus nqi thauj khoom zoo.
Nyob rau hauv seem compression, cov yas maj mam hloov ntawm cov khoom mus rau viscous ntws, thiab qhov sib tov, shearing thiab kev sib txhuam hauv seem no yog qhov nyuaj. Nyob rau xyoo 1960, cov theem hloov txoj kev xav ntawm compression seem tau tshwm sim. Qhov kev xav no yog ua raws li cov thermodynamics thiab tuaj yeem suav tau raug, tab sis cov txheej txheem suav yog nyuaj.
Lub luag haujlwm tseem ceeb ntawm homogenizing seem yog ua kom lub siab ntawm cov yas molten xa los ntawm ntu compression, ntxiv homogenize cov yas, thiab extrude nws ntau npaum li cas los ntawm lub qhov ncauj tuag ntawm lub siab tas li. Lub yaj thauj txoj kev xav ntawm homogenization seem yog raws li cov tshuab ua kua dej, thiab lub xeev rheological, kev tsim khoom thiab lub zog siv ntawm homogenization seem tau kawm thiab suav kom ntxaws.
2, Cov khoom ntws hauv lub turbine
Cov yas yog nyob rau hauv lub viscous flow xeev nyob rau hauv lub homogenization seem. Qhov sib txawv ntawm qhov sib txawv ntawm cov ntsia hlau ntsia hlau yog zoo ib yam li qhov sib txawv ntawm sab nrauv ntawm lub thoob ntsia hlau xov vim qhov tsis kam ntawm qhov tuag thiab lwm yam. Nws flow state yog raws li nram no:
① Zoo txaus, uas yog, ntws mus rau lub tshuab taub hau raws lub voj voog.
② Rov qab ntws, tseem hu ua thim rov qab, yog qhov ntws los ntawm cov tshuaj tiv thaiv ntawm qhov tuag, lub phaj splitter, cov ntxaij lim dej, thiab lwm yam rau cov yaj, thiab nws cov kev taw qhia ntws rov qab mus rau qhov zoo txaus.
⑧ Drag flow, tseem hu ua cross flow, yog kev ncig ntawm cov yaj hauv qhov muab kauv zawj. Qhov kev ntws no muaj kev cuam tshuam me ntsis rau tag nrho cov ntim extrusion thiab tuaj yeem tsis quav ntsej. Txawm li cas los xij, nws muaj kev cuam tshuam zoo rau kev sib xyaw ua ke, kev sib hloov cua sov thiab plasticization.
④ Cov dej ntws tam sim no.
3, Cov khoom tseem ceeb cuam tshuam rau cov zis
(1) Lub zog ntawm kev quab yuam - tus nqi extrusion txo qis linearly nrog nce lub taub hau siab.
① Rau cov yas granulator nrog cov ntsia hlau sib sib zog nqus zawj thiab cov ntsia hlau luv luv, qhov extrusion kom muaj nuj nqis txo qis nrog kev nce siab ntawm lub taub hau.
② Nrog rau qhov nce ntawm qhov kub thiab txias, qhov cuam tshuam ntawm kev tuag siab ntawm extrusion kom muaj nuj nqis ua qeeb.
③ Thaum qhov kev tuag tsis kam yog siab (qhov chaw ua haujlwm tau zoo me me), tus nqi extrusion yog ntau cuam tshuam los ntawm kev tuag siab.
④ Thaum cov ntsia hlau ceev yog siab, tus nqi extrusion yog siab, tab sis qhov nce ntawm lub taub hau siab yog proportional rau qhov txo ntawm tus nqi extrusion.
⑤ Qhov loj dua qhov ntev-inch qhov sib piv ntawm cov ntsia hlau, qhov me dua qhov cuam tshuam ntawm kev tuag siab ntawm extrusion kom muaj nuj nqis.
⑥ Tus nqi extrusion ntawm cov ntsia hlau tsis muaj qhov txias yog qhov cuam tshuam ntau dua los ntawm lub taub hau siab dua li ntawm cov ntsia hlau txias.
⑦ Qhov loj dua qhov sib txawv ntawm cov ntsia hlau thiab lub thoob, qhov ntau dua qhov kev faib ua feem ntawm qhov txo qis ntawm cov extrusion ntim nrog qhov nce ntawm lub taub hau siab.
(2) Cov nyhuv ntawm cov ntsia hlau ceev - tus nqi extrusion nce nrog nce ntawm cov ntsia hlau ceev, tab sis nws tsis yog linear.
① With the increase of screw speed, the extent of extrusion increase is related to the material. HDPE>LDPE>PP.
② Lub extrusion tus nqi ntawm cov khoom uas tsis muaj viscosity yaj yog ntau cuam tshuam los ntawm cov ntsia hlau ceev.
③ Thaum kub melting kub, tus nqi extrusion nce nrog qhov nce ntawm cov ntsia hlau ceev. Txawm li cas los xij, nyob rau hauv qhov qis melting kub, nws qhov nce yog tsawg heev.
④ Cov nyiaj extrusion ntawm uncooled ntsia hlau yog me ntsis cuam tshuam los ntawm cov ntsia hlau ceev dua li cov ntsia hlau txias.
⑤ Thaum qhov kev tuag tsis muaj zog, tus nqi extrusion nce nrog qhov nce ntawm cov ntsia hlau ceev; Ntawm qhov tsis sib xws, qhov kev faib ua feem ntawm kev txhim kho yog tsawg heev.
(3) Tus nqi extrusion nce sai nrog qhov nce ntawm cov khoom siv yaj ntawm cov khoom.
(4) Tus nqi extrusion nce nrog qhov nce ntawm homogenization seem ntev.
(5) Thaum lub taub hau siab qis, tus nqi extrusion nce nrog qhov tob ntawm cov ntsia hlau zawj hauv seem homogenization; Txawm li cas los xij, yog tias lub taub hau siab siab, tus nqi extrusion txo qis nrog qhov sib sib zog nqus ntawm cov ntsia hlau zawj qhov tob hauv seem homogenization.
(6) Tus nqi extrusion txo nrog qhov nce ntawm qhov sib txawv ntawm cov ntsia hlau thiab lub thoob. Txawm li cas los xij, thaum qhov sib txawv ntau dua 1 hli, tus nqi extrusion txo qis heev.
(7) Tus nqi extrusion txo nrog qhov nce ntawm qhov kub ntawm qhov chaw pub mis;
(8) Nrog rau qhov nce ntawm melting kub, tus nqi extrusion tsis hloov thaum pib. Thaum qhov kub thiab txias txuas ntxiv mus rau qee qhov, cov khoom viscosity txo qis, thiab cov nyiaj extrusion txo sai heev.
(9) Thaum lub chim kub tau nce mus rau ib qho kev txwv, lub ntim extrusion kuj txo qis vim qhov txo qis ntawm cov khoom viscosity.
(10) Tus nqi extrusion txo nrog qhov nce ntawm cov teeb meem tsis haum hauv cov khoom.
(11) Nrog rau qhov nce ntawm cov ntsia hlau kub, qhov extrusion kom muaj nuj nqis txo sharply.
(12) Nrog rau qhov tob ntawm cov ntsia hlau zawj qhov tob, tus nqi extrusion nce sai heev thaum pib, thiab txo qis thaum nws nce mus txog qee qhov kev txwv. Qhov no yog vim hais tias lub plasticization degree ntawm cov khoom nyob rau hauv lub hau ntswj yuav zuj zus tom qab qhov tob ntawm cov ntsia hlau zawj nce.
(13) Tus nqi extrusion nce proportionally nrog qhov nce ntawm thaj tsam ntawm qhov tuag txoj kev.
(14) Tus nqi extrusion txo qis proportionally nrog qhov nce ntawm qhov ntev ntawm txoj kab rov tav ntws ntawm qhov tuag.
4, Daim ntawv thov cov yam ntxwv cuam tshuam rau cov zis ntawm yas Granulator
(1) Rau cov khoom siv sib txawv ntawm cov dej ntws sib txawv, nws tsis tuaj yeem sib piv lawv cov "tso zis" raws li cov ntsia hlau ceev.
(2) Tus nqi extrusion tsis nyob rau hauv ncaj qha feem ntawm cov ntsia hlau ceev.
(3) Txawm tias tib hom yas granulator (cov qauv ntsia hlau yog tib yam, thiab qhov kub thiab txias ntawm txhua ntu yog tib yam), tus nqi extrusion ntawm tib cov khoom tsis zoo ib yam vim qhov sib txawv adapter ntev, tuag cheeb tsam ntawm lub taub hau, qhov tsis kam ntawm cov ntxaij lim dej, qib ntawm cov ntsia hlau txias, cov khoom siv preheating kub, thiab qhov sib txawv me me ntawm cov ntsia hlau thiab lub thoob ntawm cov yas granulator nws tus kheej.
(4) Rau cov yas granulator ruaj khov, tus nqi extrusion yuav txawv nyob rau lub sijhawm sib txawv vim yog qhov cuam tshuam ntawm lub siab yaj, ntsia hlau kub thiab cov khoom ruaj khov.