Rail Pad Material Classification thiab Vibration Damping Performance
Dab tsi yog cov txheej txheem tseem ceeb ntawm cov khoom siv thiab cov ntawv thov tsim nyog rau kev tsheb nqaj hlau subgrade pads?
Rail subgrade pads feem ntau muab faib ua plaub pawg: cov ntaub qhwv roj hmab, cov roj hmab sib xyaw, cov ntaub qhwv polyurethane, thiab cov ntaub qhwv hlau. Cov ntaub ntawv sib txawv ua rau muaj qhov sib txawv ntawm kev ua tau zoo, ua raws li cov kev xav tau sib txawv. Rubber pads, ua los ntawm cov roj hmab ntuj, muab cov elasticity zoo thiab tus nqi qis, nrog rau qhov zoo li qub ntawm 30-50 kN / mm, haum rau ballasted lem ntawm cov pa railways, ntsib lub hauv paus kev co txo qhov yuav tsum tau ua. Cov khoom siv roj hmab sib xyaw ua ke muaj cov roj hmab + steel phaj sandwich tsim, nrog qhov zoo li qub ntawm 60 ± 10 kN / mm thiab dynamic - rau -static stiffness ratio Tsawg dua los yog sib npaug rau 2.0, tshwj xeeb tsim rau ballastless lem ntawm siab - kev tsheb ciav hlau ceev, muab kev co zoo heev txo. Polyurethane pads yog hnav-tiv taus, roj- tiv taus, thiab laus heev-resistant, haum rau cov mining crane lem thiab chemical industrial park kab, muab lub neej ntev kev pab cuam. Cov ntaub qhwv hlau yog nruj thiab tsis muaj zog, haum rau cov khoom hnyav hnyav thiab kub kub, tsuas yog siv rau hauv cov xwm txheej tshwj xeeb, thiab tsis tshua muaj kev xaiv rau cov kab sib xws.
Dab tsi yog qhov tseem ceeb ntawm qhov ntsuas kev ua tau zoo thiab cov kev sim ntsuas rau kev tsheb nqaj hlau subgrade pads?
Cov kev qhia tseem ceeb ntawm cov tsheb ciav hlau muaj xws li tsib yam tseem ceeb: qhov ruaj khov zoo li qub, dynamic-rau- zoo li qub stiffness piv, qaug zog lub neej, kev laus tsis kam, thiab hnav tsis kam. Cov no yog cov txheej txheem kev ntsuam xyuas tseem ceeb rau cov ntaub qhwv zoo. Lub zog zoo li qub ntawm cov pa tsheb ciav hlau yog tswj ntawm 30-50 kN / mm, thaum lub siab - ceev railway pads yog 60 ± 10 kN / mm, kom muaj qhov sib npaug ntawm elastic buffering thiab rail fixation. Ib qho dynamic-rau- zoo li qub stiffness piv Tsawg dua los yog sib npaug li 2.0 yog qhov yuav tsum tau ua rau siab - ceev railway pads los tiv thaiv resonance los ntawm siab - ceev kev co thiab txhim kho kev caij tsheb smoothness. Kev qaug zog lub neej yuav tsum muaj ntau dua lossis sib npaug li 2 lab compression cycles kom ntseeg tau tias siv mus ntev yam tsis muaj kev ua haujlwm thiab txo qhov zaus hloov. Kev laus tiv thaiv yuav tsum ua kom tau raws li qhov yuav tsum tau ua kom muaj ntau dua lossis sib npaug li 80% ntawm elasticity tom qab kev laus ntawm 70 degree, thiab hnav tsis kam tsawg dua lossis sib npaug li 0.1 cm³ / 1.61 km, yoog rau qhov chaw sab nraum zoov. Tag nrho cov ntaub qhwv tau txais 100% nruj sampling tshuaj xyuas ua ntej tawm hauv lub hoobkas; cov khoom tsis tsim nyog yog txwv tsis pub tawm hauv lub hoobkas.
Dab tsi yog qhov zoo ntawm cov txheej txheem ntawm high - kev tsheb ciav hlau ceev - cov ntaub ntawv sib xyaw ua ke tshwj xeeb?
High-Speed rail composite rail pads siv cov khoom siv sib xyaw ua ke uas muaj ob txheej roj hmab thiab 0.5-0.7mm siab- lub zog steel phaj hauv nruab nrab, muab peb qhov zoo dua piv rau cov roj hmab ntshiab. Cov hlau phaj sandwich txhim khu lub lateral tawv ntawm lub ncoo, tiv thaiv kev hloov pauv thaum lub sijhawm ua haujlwm siab -, kom ntseeg tau tias muaj kev sib tw nruj ntawm txoj kev tsheb ciav hlau thiab lub ncoo, thiab txo qhov hnav. Cov roj hmab txheej saum npoo nta duab plaub thiab grooves; nyob rau hauv siab, cov grooves no tau sau, sib npaug ntawm lub log-rail load, tshem tawm kev ntxhov siab, thiab txhim kho cushioning. Cov qauv sandwich ua rau muaj qhov sib txawv ntawm - mus rau - qhov sib txawv ntawm qhov tsis sib xws ntawm Tsawg dua lossis sib npaug li 2.0, ua tau raws li cov kev xav tau ntawm kev vibration ntawm siab - kev tsheb ciav hlau ceev, txo lub log - tsheb ciav hlau kev co suab nrov, thiab txhim kho cov neeg caij tsheb. Nyob rau tib lub sijhawm, steel phaj sandwich txhim kho lub ncoo lub kua muag tsis kam, ua tiav lub neej qaug zog ntawm Ntau dua lossis sib npaug rau 3 lab lub voj voog, ntau dua 50% ntev dua li cov roj hmab ntshiab, ua tau raws li qhov ntev - kev tu lub sij hawm- pub dawb ntawm kev kub ceev tsheb ciav hlau.
Dab tsi yog qhov kev qhia tshwj xeeb thiab kev siv ceev faj rau kev tsheb ciav hlau?
Ua ntej txhim kho cov tsheb ciav hlau, ntxuav qhov chaw sib cuag ntawm cov neeg pw tsaug zog thiab cov hlua ntawm cov khib nyiab thiab cov plua plav kom ntseeg tau tias lub tiaj tiaj, du nto thiab tiv thaiv kev ntxhov siab tsis sib xws uas tuaj yeem ua rau deformation. Cov ntaub qhwv yuav tsum tau ua raws li txoj kab nruab nrab ntawm txoj kab nruab nrab, nrog rau sab nraud ntawm qhov tsawg dua lossis sib npaug li 3 hli thiab seamless longitudinal sib tshooj kom tsis txhob muaj cov khoom hnyav uas tuaj yeem ua rau cov ntaub qhwv. Tsis txhob khawb cov roj hmab nrog cov khoom ntse thaum lub sijhawm teeb tsa. Cov hlau interlayer ntawm cov ntaub ntawv sib xyaw yuav tsum fim rau sab pw tsaug zog kom ntseeg tau tias muaj qhov tsim nyog thauj khoom -cov qauv kev coj tus kheej thiab pom kev vibration damping. Thaum siv, tiv thaiv cov ntaub qhwv los ntawm cov roj los yog tshuaj reagents, vim cov roj yuav ua rau cov roj hmab corrode, txo elasticity thiab lifespan. Rau cov lem hauv thaj chaw muaj tshuaj lom neeg, roj- cov ntaub qhwv polyurethane yuav tsum tau siv. Nyob rau hauv siab -lub caij kub, xyuas kom softening thiab deformation; nyob rau hauv qis-lub caij kub, xyuas kom tawg. Hloov cov ntaub qhwv uas puas lossis muaj hnub nyoog tam sim ntawd kom tswj tau lawv txoj haujlwm cushioning.
Dab tsi yog cov lus qhia xaiv rau kev tsheb ciav hlau nyob rau hauv ib puag ncig sib txawv?
Hauv thaj chaw ntub dej ntawm ntug dej hiav txwv, xaiv cov roj hmab sib xyaw nrog cov tshuaj tiv thaiv -corrosion txheej. Anti- cov neeg ua haujlwm laus tau ntxiv rau cov roj hmab kom tiv thaiv cov dej hiav txwv corrosion thiab txuas ntxiv lub neej kev pab cuam. Rau cov cheeb tsam khov, txias- cov roj hmab tiv taus raug xaiv, tiv taus qhov kub qis li -40℃los tiv thaiv cov roj hmab tawg thiab ua kom elasticity nyob rau hauv qis- qhov kub thiab txias ib puag ncig. Rau kev lag luam thiab mining crane rails, polyurethane pads raug xaiv, muab cov roj ua haujlwm, hnav tsis kam, thiab kev cuam tshuam tsis zoo, haum rau qhov hnyav heev -load dov los ntawm cranes, txo qhov hloov pauv zaus. Rau siab-ceev rail ballastless lem, lub teb chaws tus qauv sib xyaw roj hmab ncoo yog yuav tsum tau, nrog ib tug zoo li qub stiffness ntawm 60 ± 10kN / mm, ua tau raws li siab - ceev vibration yuav tsum. Rau cov pa railway ballasted lem, zoo tib yam roj hmab pads yog txaus, muab tus nqi -effectiveness thiab ntsib lub hauv paus buffering xav tau kev pab. Rau cov khoom siv tshuaj lom neeg cov chaw ua si, cov khoom siv tiv thaiv corrosion-resistant polyurethane pads raug xaiv; xaiv hom tsim nyog raws li cov kev xav tau tshwj xeeb ua rau kev ua haujlwm siab tshaj plaws thiab txo cov nqi tu.