Rail Pad Material Classification thiab Application Scenarios
Dab tsi yog qhov sib txawv ntawm cov roj hmab rail pads thiab polyurethane rail pads?
Qhov sib txawv tseem ceeb ntawm cov roj hmab rail pads thiab polyurethane pads nyob rau hauv cov khoom siv, cov xwm txheej, thiab kev pab cuam lub neej. Cov khoom siv roj hmab yog tsim los ntawm cov roj hmab ntuj lossis cov roj hmab hluavtaws, nrog rau cov qauv elastic modulus (80-}120MPa), cov nyhuv poob siab zoo, haum rau cov pa tsheb ciav hlau ceev thiab cov kab tsheb ciav hlau hauv nroog, thiab tus nqi qis. Polyurethane pads yog ua los ntawm polyurethane elastomer cov ntaub ntawv, nrog ib tug ntau dua elastic modulus (120-160MPa), thiab lawv hnav tsis kam yog 2-3 npaug ntawm cov roj hmab pads, uas muaj peev xwm tiv tau ntev - lub sij hawm cuam tshuam ntawm hnyav-haul tsheb ciav hlau thiab yog haum rau hnyav-haul tshwj xeeb kab. Rubber pads muaj qhov tsis muaj zog tiv thaiv kev laus, ua rau tawg nyob rau hauv qhov kub thiab txias thiab ultraviolet ib puag ncig, nrog rau kev pab cuam lub neej txog li 5-8 xyoo; polyurethane pads muaj zog tiv taus huab cua, qeeb aging ceev, thiab kev pab lub neej ntawm 10-15 xyoo. Nyob rau hauv cov nqe lus ntawm installation adaptability, roj hmab pads yog hloov tau thiab yooj yim rau txiav thiab kho, thaum polyurethane pads muaj zog dua hardness thiab yuav tsum tau ntau dua installation raug. Lub peev xwm thauj khoom ntawm ob qhov sib txawv yog qhov sib txawv: lub zog compressive ntawm polyurethane pads yog ntau dua lossis sib npaug li 25MPa, thiab cov ntaub qhwv roj hmab yog li 15-20MPa, uas yuav tsum tau xaiv raws li cov kab loads.
Dab tsi yog qhov zoo ntawm cov qauv tsim ntawm cov khoom sib xyaw rail pads?
Composite cov ntaub ntawv rail pads txais ib tug multi- txheej txheej txheem tsim ntawm "cov khoom siv hauv paus + cov txheej txheem ntxiv + hnav- txheej tiv thaiv", sib txuas qhov zoo ntawm cov khoom sib txawv kom haum rau txoj kab kev xav tau. Cov khoom siv hauv paus feem ntau yog siab- elasticity roj hmab kom ntseeg tau tias muaj kev cuam tshuam kev poob siab thiab txo lub log- kev tsheb nqaj hlau cuam tshuam; Cov txheej txheem nruab nrab yog ua los ntawm cov iav fiber ntau los yog cov ntaub ntawv carbon fiber los txhim kho lub zog compressive thiab deformation tsis kam ntawm lub ncoo, tsis txhob compression mus tas li nyob rau hauv lub sij hawm ntev - loads. Kev hnav khaub ncaws saum npoo- txheej tiv thaiv yog ua los ntawm cov khoom siv polyurethane lossis nylon, nrog rau qhov hnyav thiab muaj zog hnav tsis kam, ncaj qha hu rau cov tsheb ciav hlau kom ntev lub neej kev pab cuam ntawm lub ncoo. Cov qauv sib xyaw tuaj yeem ua kom zoo dua qhov elastic modulus gradient, ua rau lub ncoo kom muaj kev ua haujlwm zoo ntawm kev poob siab thaum tuav cov qauv kev ruaj ntseg, zam qhov kev ua haujlwm tsis zoo ntawm ib qho khoom siv. Piv txwv li, cov ntaub ntawv sib xyaw siv nyob rau hauv siab - cov kab tsheb ciav hlau ceev muaj cov qauv elastic tswj ntawm 100-120MPa, uas tuaj yeem tsis tsuas yog ua tau raws li qhov yuav tsum tau ua kom du ntawm siab - tsheb ciav hlau ceev tab sis kuj tuaj yeem tiv taus qhov kev vibration siab, thiab lawv lub neej kev pabcuam yog ntau tshaj 50% ntev dua li ntawm ib qho roj hmab ncoo.
Cov xwm txheej twg muaj feem xyuam rau tus qauv txawv teb chaws CRCC-cov ntaub ntawv pov thawj?
Txawv teb chaws tus qauv CRCC- ntawv pov thawj rail pads yog siab- cov khoom kawg tsim rau siab - ceev thiab siab - cov kab smoothness, feem ntau haum rau siab - kev tsheb ciav hlau ceev, cov neeg caij tsheb thiab lwm yam xwm txheej. Xws li cov ntaub qhwv tau dhau los ntawm kev ntsuas kev ua tau zoo, nrog kev hloov pauv hloov pauv ntawm elasticity tsawg dua lossis sib npaug li ± 5%, ua kom muaj kev ruaj ntseg ntawm kev taug qab geometric tsis thiab yoog rau kev ua haujlwm ntawm cov tsheb ciav hlau nrog ceev ntawm 350km / h thiab siab dua. Lawv muaj kev qaug zog zoo heev, thiab tom qab 10 lab lub voj voog ntawm kev kuaj, qhov elastic attenuation tus nqi tsawg dua los yog sib npaug li 3%, uas tuaj yeem tswj kev poob siab rau lub sijhawm ntev thiab txo cov kab ntau zaus. CRCC-cov ntaub ntawv pov thawj muaj kev ua tau zoo ntawm rwb thaiv tsev, nrog lub ntim tiv taus ntau dua lossis sib npaug ntawm 10^8Ω·cm, uas tuaj yeem tiv thaiv kev cuam tshuam ntawm kev cuam tshuam thiab ua kom lub cev ua haujlwm zoo ntawm lub teeb liab. Qee cov khoom lag luam muaj kev tiv thaiv-frost heave tsim, nrog rau elastic rov qab tus nqi siab dua los yog sib npaug li 90% ntawm -40℃qis kub, haum rau high-speed rail kab hauv cheeb tsam alpine. Tsis tas li ntawd, cov ntaub ntawv zoo li no muaj qhov tseeb qhov tseeb, nrog qhov ntev thiab qhov dav ntawm qhov tsawg dua lossis sib npaug ntawm ± 0.3mm, haum nrog cov kab slab zawj kom tsis txhob muaj suab nrov.
Vim li cas polyurethane rail pads nyiam nyob rau hauv siab - kub thiab siab - cov av noo?
Cov xwm txheej ib puag ncig hauv siab - kub thiab siab - thaj chaw av av muaj qhov xav tau siab heev rau cov huab cua tsis kam thiab corrosion tsis kam ntawm cov ntaub thaiv kev tsheb ciav hlau, thiab cov ntaub qhwv polyurethane yog qhov kev xaiv zoo tshaj plaws. Nyob rau hauv qhov kub ntawm - kub thiab siab - cov av noo ib puag ncig, cov ntaub qhwv roj hmab yog qhov yooj yim rau kev nqus dej, pwm loj hlob, softening thiab deformation, ua rau txo elasticity thiab poob siab absorbing tsis ua hauj lwm; polyurethane pads muaj qhov nqus dej tsawg heev (tsawg dua lossis sib npaug li 1%), thiab lawv qhov kev ua tau zoo yuav tsis cuam tshuam los ntawm kev nqus dej noo, tswj kev ruaj khov elasticity thiab lub zog. Nyob rau hauv siab - qhov kub thiab txias, polyurethane pads muaj thermal stability zoo, nrog ib qho elastic modulus hloov tus nqi tsawg dua los yog sib npaug li 10% ntawm 60-80 degree, thaum cov ntaub qhwv roj hmab yog qhov yooj yim rau kev laus thiab tawg, nrog rau kev ua tau zoo attenuation. Cov khoom siv polyurethane nws tus kheej muaj kev tiv thaiv corrosion thiab tuaj yeem tiv thaiv kev yaig ntawm cov tshuaj lom neeg hauv cov chaw ntub dej, thaum cov ntaub qhwv roj hmab xav tau ntxiv los tiv thaiv - kev kho corrosion, txwv tsis pub, lawv yuav ua rau delamination thiab puas. Rau cov tsheb ciav hlau hauv nroog thiab cov kab tsheb ciav hlau ceev hauv cov cheeb tsam zoo li no, kev siv cov ntaub qhwv polyurethane tuaj yeem txo qhov zaus hloov, txo tus nqi tu, thiab xyuas kom cov khiav du, tsis txhob muaj kev pheej hmoo ntawm kev ua haujlwm los ntawm lub ncoo tsis ua haujlwm.
Yam dab tsi yuav tsum tau xav txog thaum xaiv lub thickness ntawm rail pads?
Kev xaiv ntawm rail ncoo thickness yuav tsum tau ua tib zoo xav txog kab hom, kab qauv, load tej yam kev mob thiab poob siab absorbing yuav tsum tau kom paub meej tias kev ua tau zoo adaptation. Cov pa hluav taws xob ceev thiab cov kab tsheb ciav hlau hauv nroog tsom rau kev poob siab, thiab lub ncoo thickness feem ntau yog 10-12mm, uas tuaj yeem ua tsis tau tsuas yog ua tau raws li elastic shock absorption tab sis kuj tsis txo cov kev tsheb ciav hlau ruaj khov vim cov tuab tuab heev. High- cov kab tsheb ciav hlau ceev muaj qhov xav tau ntau dua rau kev ua kom du, thiab lub ncoo tuab yog tswj ntawm 8-10mm kom txo tau txoj kab ntsug deformation thiab xyuas kom ruaj khov thaum tsheb ciav hlau khiav ntawm kev kub ceev. Vim muaj qhov loj ntawm cov kab hnyav hnyav, lub ncoo tuab yuav tsum tau nce mus rau 12-15mm txhawm rau txhim kho cov kabmob muaj peev xwm thiab compression deformation tsis kam, tsis txhob hnav ntau dhau ntawm lub ncoo. Cov qauv kev taug qab kuj tseem cuam tshuam rau qhov kev xaiv tuab: lub ncoo thickness ntawm ballastless lem yog nyias (8-10mm), thaum ballasted lem siv pad thickness ntawm 10-12mm los ua kom tsis txaus ballast elasticity. Tsis tas li ntawd, nws yuav tsum tau hloov kho raws li hom kev tsheb ciav hlau: lub ncoo thickness sib haum mus rau 60kg / m hnyav rails yog 2-3 hli tuab dua li ntawm 50kg / m rails kom ntseeg tau tias cov khoom thauj tsis sib xws thiab txuas ntxiv lub neej kev pabcuam ntawm cov ntaub qhwv thiab cov ntsia hlau.