Rail pads zaum nyob rau hauv cov tsheb ciav hlau mus tas li, yog li lawv tus cwj pwm deformation txiav txim siab ntev npaum li cas lub fastening ua rau nws tsim nruj. Compressive deformation - ib qho kev txo qis hauv ncoo thickness - ntsiag to converts ib tug noj qab nyob zoo fastening rau hauv ib tug xoob: clamping quab yuam te, rail deflection loj hlob thiab cov pw tsaug zog yuav siv sij hawm qhov loads nws yeej tsis tau tsim rau. Kev zam nws pib ntawm kev xaiv cov khoom siv thiab xaus nrog kev saib xyuas kev qhuab qhia.
Compressive Deformation yog dab tsi
Raws li kev txhawb nqa compression, elastomers maj mam poob lub peev xwm rov qab mus rau lawv qhov qub thickness. Qhov kev poob mus tas li, qhia raws li compression teeb, yog cov cuab yeej ntawm cov khoom sib xyaw thiab qhov kub thiab txias, tsis yog ntawm cov ntaub ntawv tsim ib leeg. Ib lub ncoo nrog lub siab compression teeb flattens ntau xyoo, lub rooj zaum tsheb nqaj hlau qis dua, thiab lub fastening poob nws qhov preload. Vim tias qhov kev hloov pauv yog maj mam, nws feem ntau pom tsuas yog thaum ntsuas qhov ntsuas lossis qhov ntsuas lub zog clamping qhia nws.
Xaiv cov khoom siv: Thawj Kab Kev Tiv Thaiv
Lub compound txiav txim siab lub ncoo qhov tsis kam mus tas li deformation:
Siv cov- zoo elastomers - ntuj roj hmab, styrene-butadiene roj hmab (SBR), EPDM los yog cov thermoplastics uas muaj elasticity siab thiab tsis tshua muaj compression teeb - es tsis siv los yog hnyav hnyav cov tebchaw uas nws cov khoom tawg thiab muaj hnub nyoog sai.
Xaiv cov tsev neeg polymer los ntawm ib puag ncig: EPDM thiab tshwj xeeb tsim cov tshuaj sib xyaw rau ozone, UV thiab ntug dej hiav txwv; qis-cov qauv ntsuas kub rau cov kab alpine kom lub ncoo tsis tawv thiab tawg thaum lub caij ntuj no.
suav nrog cov tshuaj tiv thaiv- cov neeg laus laus hauv qhov kev qhia tshwj xeeb; lawv tiv thaiv cov compound los ntawm oxidation uas accelerates teem.
Kev ntsuas tsim: Geometry thiab tawv
Kev tsim qauv tswj kev deformation los ntawm kev nthuav tawm cov khoom thauj thiab tswj cov kab mob:
Thickness: ib qho tuab tuab tuab dua rau tib qhov deflection, tab sis thickness yog teem los ntawm tus tsim fastening thiab lub hom phiaj nruj, tsis xaiv arbitrarily.
Grooves thiab studs: tus qauv saum npoo muab chav elastomer rau deform tom qab thiab tswj qhov nruj; nws yuav tsum tau ua dua tshiab raws nraim hauv kev tsim khoom, vim tias qhov tob tob yuam kev hloov txoj kev thauj khoom.
Kev pov thawj: cov ntaub qhwv tau raug kuaj nyob rau hauv cov neeg sawv cev siab siab - rau kev taug kev hnyav, kev pabcuam siab sib npaug li 800 kN ib lub rooj tsav tsheb yog siv los ua ke cov kev xeem - thiab yuav tsum qhia cov tuab tuab thiab nruj tom qab rov ua dua.
Nkag siab txog Load Capacity Figures
Pad kev ntaus nqi tau hais nyob rau hauv ob txoj kev sib txawv, thiab tsis meej pem lawv ua rau cov lus qhia yuam kev:
Kev nruj (kN / mm): qhov ntsug load xav tau los compress lub ncoo los ntawm 1 hli. Cov ntaub ntawv tseem ceeb yog nyob rau hauv 80-200 kN / mm ntau; nruj, tsis kawg lub zog, tswj kev vibration thiab load sib koom.
Qhov kawg lub zog (MPa lossis PSI): qhov kev ntxhov siab uas cov khoom tsis ua haujlwm. Cov txiaj ntsig xws li 15,000 PSI (kwv yees 103 MPa) piav qhia txog cov khoom siv txwv, thaum kev pabcuam kev ntxhov siab rau hnyav- cov ntaub pua plag yog ib feem ntawm qhov ntawd - nyob rau hauv qhov kev txiav txim ntawm 7 MPa (70 bar) rau kev thauj khoom ib txwm muaj, nrog cov peaks siab dua.
Yog li ntawd, lub ncoo tuaj yeem nyob deb ntawm cov khoom siv tsis ua haujlwm tseem tseem tuaj yeem hnav tawm ua haujlwm, vim tias nws cov txheej txheem compression tau tshem tawm qhov tsim nruj. Qhia ob qho tseem ceeb, thiab txiav txim siab kev pabcuam lub neej los ntawm kev nruj thiab kev teeb tsa, tsis yog los ntawm lub zog npoo.
Kev txhim kho thiab kev saib xyuas
Txawm tias qhov zoo tshaj plaws ncoo ua tsis tau thaum ntxov yog tias kev teeb tsa thiab kev saib xyuas tsis raug:
Re-Tightening tom qab thawj lub tsheb hla dhau: cov ntaub so ntswg nyob thiab cov clamping quab yuam poob, uas ua rau cov ntaub qhwv strain thiab teeb tsa.
Tshawb xyuas cov ntaub qhwv ib ntus kom nyias nyias, tawv, tawg thiab poob ntawm qhov rov qab; hloov lawv ua ntej lub fastening poob nws tsim nruj.
Ntawm cov kab uas muaj kev txhoj puab heev, suav nrog cov ntaub qhwv hauv tib lub voj voog soj ntsuam raws li clips thiab bolts, thiab sau cov thickness ntsuas kom pom cov qauv.
Thaum hloov, siv cov tuab tuab thiab qib qub: cov ntaub qhwv tuab dua hloov cov qib kev tsheb nqaj hlau thiab kev thauj khoom ua ntej, thiab qhov sib txawv hardness hloov tag nrho fastening stiffness.
Cov lus nug nquag
Vim li cas rail pads flatten lub sij hawm?
Tag nrho cov elastomers poob ib co elasticity nyob rau hauv sustained compression thiab kub cycling. Tus nqi yog nyob ntawm qhov ua tau zoo, qhov kev pabcuam kub, kev thauj mus los thiab muaj cov ozone lossis tshuaj lom neeg. High-cov khoom sib txuas zoo nrog cov compression qis qis maj mam maj mam; recycled los yog overfilled compounds flatten sai thiab yuav tsum tsis txhob siv nyob rau hauv mainline khiav.
Dab tsi yog compression teeb?
Cov txheej txheem compression yog qhov deformation tas mus li ntxiv tom qab tus qauv tau raug compressed rau lub sij hawm uas tau hais tseg ntawm qhov ntsuas kub thiab tom qab ntawd tso tawm. Nws yog ntsuas ib tus qauv xws li ISO 815 thiab tau hais tias yog ib feem pua ntawm thawj deflection. Cov nqi qis dua txhais tau hais tias lub ncoo khaws nws cov tuab thiab tawv ntev dua.
Yuav tsum tuab npaum li cas lub ncoo hloov pauv?
Raws nraim lub thickness teev nyob rau hauv lub fastening daim duab rau lub rooj zaum rail. Ib daim ntaub tuab dua nqa cov tsheb ciav hlau thiab hloov pauv ua ntej; ib lub ncoo thinner txo cov clamping quab yuam thiab ua rau muaj kev cuam tshuam rau ntawm tus neeg tsaug zog. Ntsuas lub ncoo qub thiab paub meej tias daim duab kos ua ntej xaj hloov.
Puas tuaj yeem siv roj hmab ncoo siv rau ntawm txoj kab tseem ceeb?
Tsis pom zoo. Cov khoom siv rov ua dua tshiab tau tawg ua kom tawv tawv, kev laus sai dua thiab tsis tuaj yeem xav tau compression teeb tsa, thiab hom tsis ua haujlwm - ntsiag to poob ntawm qhov tawv nqaij - yog raws nraim qhov nyuaj tshaj plaws los ntes hauv kev pabcuam. Cov khoom siv rov ua dua tshiab yog nyob rau hauv cov ntawv tsis yog- tseem ceeb, tsis nyob hauv txoj kab tsheb loj.
Kuv tuaj yeem qhia tau li cas thaum lub ncoo yuav tsum tau hloov?
Hloov cov ntaub qhwv thaum ntsuas cov thickness poob siab tshaj qhov kev txwv kev txwv, thaum lub npoo yog tawg, hardened los yog delaminated, los yog thaum lub fastening tsis ncav cuag nws lub zog clamping ntawm qhov tseeb torque. Kev ntsuas thickness tsis tu ncua hloov hloov mus rau hauv ib txoj haujlwm teem tseg es tsis txhob muaj xwm txheej ceev.