Nres padsyog cov khoom sib txhuam ruaj khov rau ntawm lub nruas nres lossis disc uas tig nrog lub log, uas cov kev sib txhuam hauv ob sab phlu thiab kev sib txhuam hauv ob sab yog raug rau sab nraud los tsim kev sib txhuam kom ua tiav lub hom phiaj ntawm lub tsheb deceleration.
Kev sib txhuam thaiv yog cov khoom siv sib txhuam uas raug thawb los ntawm lub clamp piston thiab nyem rau ntawm qhovnres disc, vim muaj kev sib txhuam cov nyhuv, cov kev sib txhuam thaiv yuav hnav maj mam, feem ntau hais lus, tus nqi qis dua ntawm cov khoom siv ntawm cov brakes hnav sai dua.Kev sib txhuam thaiv tau muab faib ua ob ntu: cov khoom sib txhuam thiab cov phaj hauv paus.Tom qab cov khoom sib txhuam yog hnav, lub hauv paus phaj yuav nyob rau hauv kev sib cuag ncaj qha nrog lub nres disc, uas thaum kawg yuav poob lub braking nyhuv thiab puas lub nres disc, thiab cov nqi kho ntawm lub nres disc yog kim heev.
Feem ntau, cov kev cai yooj yim rau cov ntaub thaiv npog yog feem ntau hnav tsis kam, coefficient loj ntawm kev sib txhuam, thiab cov khoom siv thermal rwb thaiv tsev zoo heev.
Raws li txoj kev sib txawv ntawm kev sib tw nres nres tuaj yeem muab faib ua: nruas nres ncoo thiab disc nres ncoo, raws li cov ntaub ntawv sib txawv ntawm cov khoom siv sib txawv tuaj yeem muab faib ua asbestos hom, semi-metallic hom, NAO hom (ie non-asbestos organic khoom. hom) nres nres thiab lwm yam peb.
Nrog rau txoj kev loj hlob sai ntawm cov cuab yeej siv niaj hnub no, zoo li lwm cov khoom siv nres, cov nres nres lawv tus kheej tau hloov kho thiab hloov pauv hauv xyoo tas los no.
Hauv cov txheej txheem tsim khoom ib txwm muaj, cov khoom siv sib txhuam siv hauv cov pawm nres yog sib xyaw ntawm ntau cov nplaum lossis cov khoom siv ntxiv, uas cov fibers tau ntxiv los txhim kho lawv lub zog thiab ua kom muaj zog.Nres pad manufacturers nyiam ua kom lawv lub qhov ncauj kaw thaum nws los txog rau kev tshaj tawm cov ntaub ntawv siv, tshwj xeeb tshaj yog cov qauv tshiab.Qhov kawg tshwm sim ntawm nres nres nres, hnav tsis kam, kub tsis kam thiab lwm yam khoom yuav nyob ntawm seb qhov sib txawv ntawm cov khoom sib txawv.Hauv qab no yog ib qho kev sib tham luv luv ntawm ntau yam sib txawv ntawm cov khoom siv nres.
Asbestos hom brakes
Asbestos tau siv los ua cov khoom siv dag zog rau cov pawm nres txij thaum pib.Asbestos fibers muaj lub zog siab thiab kub tsis kam, yog li lawv tuaj yeem ua tau raws li qhov yuav tsum tau ua ntawm cov pawm brakes thiab clutch discs thiab hauv ob sab phlu.Cov fibers muaj lub zog tensile siab, txawm tias txuam nrog cov qib high-qib steel, thiab tuaj yeem tiv taus kub txog 316 ° C.Qhov tseem ceeb tshaj, asbestos kuj tseem pheej yig thiab yog muab rho tawm los ntawm amphibole ore, uas muaj nyob rau hauv ntau ntau nyob rau hauv ntau lub teb chaws.
Asbestos tau raug pov thawj kev kho mob los ua cov tshuaj carcinogenic.Nws cov koob zoo li cov fibers tuaj yeem nkag mus rau hauv lub ntsws tau yooj yim thiab nyob ntawd, ua rau khaus thiab thaum kawg ua rau mob qog noj ntshav, tab sis lub sijhawm latent ntawm tus kab mob no tuaj yeem ntev li 15-30 xyoo, yog li tib neeg feem ntau tsis paub txog qhov mob tshwm sim los ntawm asbestos.
Ntev npaum li asbestos fibers raug kho los ntawm cov khoom sib txhuam nws tus kheej yuav tsis ua rau muaj kev phom sij rau cov neeg ua haujlwm, tab sis thaum asbestos fibers raug tso tawm nrog rau kev sib txhuam los ua cov plua plav nres, nws tuaj yeem dhau los ua cov teebmeem kev noj qab haus huv.
Raws li kev ntsuam xyuas los ntawm American Occupational Safety and Health Association (OSHA), txhua lub sij hawm ib tug niaj hnub kev sib txhuam kev ntsuam xyuas, lub nres pads yuav tsim tsheej lab ntawm asbestos fibers emissions mus rau hauv cov huab cua, thiab cov fibers muaj ntau me dua ib tug tib neeg cov plaub hau, uas tsis pom qhov muag liab qab, yog li ua tsis taus pa yuav nqus ntau txhiab asbestos fibers yam tsis muaj neeg paub txog nws.Ib yam li ntawd, yog tias lub nruas nres lossis nres qhov chaw hauv cov plua plav plua plav tawm nrog cov cua hose, kuj tuaj yeem suav tsis tau asbestos fibers rau hauv huab cua, thiab cov plua plav no, tsis tsuas yog yuav cuam tshuam rau kev noj qab haus huv ntawm tus kws kho tsheb, tib yam yuav ua rau kev puas tsuaj rau lwm tus neeg ua haujlwm tam sim no.Txawm tias qee qhov kev ua haujlwm yooj yim heev xws li ntaus lub nruas nres nrog rauj kom xoob nws thiab cia cov plua plav sab hauv tuaj yeem tsim tawm ntau cov asbestos fibers ntab rau saum huab cua.Dab tsi tseem ceeb tshaj yog tias ib zaug cov fibers ntab saum huab cua lawv yuav kav ntev li ib teev thiab tom qab ntawd lawv yuav lo rau khaub ncaws, rooj, cuab yeej, thiab txhua qhov chaw uas koj tuaj yeem xav txog.Txhua lub sij hawm lawv ntsib kev nplawm (xws li ntxuav, taug kev, siv cov cuab yeej pneumatic los tsim cov cua ntws), lawv yuav ntab rov qab rau hauv huab cua dua.Feem ntau, thaum cov khoom no nkag mus rau hauv qhov chaw ua haujlwm, nws yuav nyob twj ywm rau ntau lub hlis lossis ntau xyoo, ua rau muaj kev cuam tshuam kev noj qab haus huv rau cov neeg ua haujlwm nyob ntawd thiab txawm rau cov neeg siv khoom.
Lub koom haum American Occupational Safety and Health Association (OSHA) tseem hais tias nws tsuas yog muaj kev nyab xeeb rau tib neeg ua haujlwm hauv ib puag ncig uas tsis muaj ntau tshaj 0.2 asbestos fibers ib square meter, thiab cov plua plav asbestos los ntawm kev ua haujlwm nres nres yuav tsum raug txo kom tsawg thiab ua haujlwm. uas tuaj yeem ua rau cov plua plav tawm (xws li tapping brake pads, thiab lwm yam) yuav tsum zam kom ntau li ntau tau.
Tab sis ntxiv rau qhov muaj kev phom sij rau kev noj qab haus huv, muaj lwm qhov teeb meem tseem ceeb nrog asbestos-based nres nres.Txij li thaum asbestos yog adiabatic, nws cov thermal conductivity yog qhov tsis zoo, thiab kev siv lub nres rov qab yuav ua rau muaj cua sov los tsim hauv lub nres nres.Yog hais tias lub brakes ncav cuag ib theem ntawm cov cua sov, lub brakes yuav poob.
Thaum cov tuam txhab tsim tsheb thiab cov neeg muag khoom nres tau txiav txim siab los tsim cov kev hloov tshiab thiab kev nyab xeeb dua rau asbestos, cov ntaub ntawv sib txhuam tshiab tau tsim yuav luag ib txhij.Cov no yog cov "semi-metallic" blends thiab non-asbestos organic (NAO) brake pads tham hauv qab no.
"Semi-metallic" hybrid nres ncoo
"Semi-met" sib tov nres pads yog tsuas yog ua los ntawm coarse steel wool raws li ib tug reinforcing fiber thiab ib qho tseem ceeb sib tov.Los ntawm cov tsos mob (zoo fibers thiab hais) nws yog ib qho yooj yim kom paub qhov txawv asbestos hom los ntawm non-asbestos organic hom (NAO) nres pads, thiab lawv kuj sib nqus nyob rau hauv cov xwm.
Lub zog siab thiab thermal conductivity ntawm steel fleece ua rau "semi-metallic" blended brake pads muaj cov yam ntxwv sib txawv ntawm cov tsoos asbestos pads.Cov ntsiab lus hlau siab kuj hloov pauv cov yam ntxwv ntawm kev sib txhuam ntawm lub nres nres, uas feem ntau txhais tau hais tias "semi-metallic" brake pad yuav tsum muaj siab dua braking kom ua tiav tib lub zog braking.Cov ntsiab lus hlau siab, tshwj xeeb tshaj yog nyob rau hauv qhov txias txias, kuj txhais tau hais tias cov ntaub qhwv yuav ua rau lub ntsej muag ntau dua ntawm cov discs lossis nruas, nrog rau cov suab nrov ntau dua.
Lub ntsiab kom zoo dua ntawm "Semi-hlau" nres nres yog lawv qhov ntsuas kub muaj peev xwm thiab siab dua braking kub, piv rau qhov tsis zoo ntawm kev hloov pauv cua sov ntawm hom asbestos thiab lub peev xwm txias tsis zoo ntawm cov nres discs thiab nruas.Thaum tshav kub kub hloov mus rau lub caliper thiab nws cov khoom.Tau kawg, yog tias qhov cua sov no tsis ua haujlwm zoo nws kuj tuaj yeem ua rau muaj teeb meem.Lub brake kua kub yuav nce siab thaum nws rhuab, thiab yog hais tias qhov kub thiab txias nce mus txog ib theem, nws yuav ua rau tus nres yuav ntswj thiab lub brake kua boil.Cov cua sov no kuj muaj qhov cuam tshuam rau lub caliper, piston foob thiab rov qab lub caij nplooj ntoos hlav, uas yuav ua rau kom muaj kev laus ntawm cov khoom no, uas yog vim li cas rau reassembling lub caliper thiab hloov cov hlau qhov chaw thaum lub sij hawm nres kho.
Non-asbestos organic braking khoom (NAO)
Cov ntaub ntawv tsis-asbestos organic nres feem ntau yog siv cov iav fiber ntau, muaj ntxhiab polycool fibers lossis lwm cov fibers (carbon, ceramic, thiab lwm yam) raws li cov ntaub ntawv txhawb zog, uas nws qhov kev ua tau zoo yog nyob ntawm hom fiber ntau thiab lwm yam sib xyaw ntxiv.
Cov ntaub ntawv tsis-asbestos organic nres tau tsim los ua lwm txoj hauv kev asbestos muaju rau cov nruas nres lossis cov khau nres, tab sis tsis ntev los no lawv kuj tseem raug sim los ua kev hloov rau pem hauv ntej disc nres.Nyob rau hauv cov nqe lus ntawm kev ua tau zoo, NAO hom nres ncoo yog ze rau asbestos nres pads dua li semi-metallic nres ncoo.Nws tsis muaj qhov zoo thermal conductivity thiab zoo kub controllability zoo li semi-metallic pads.
Yuav ua li cas NAO raw khoom piv rau asbestos nres pads?Cov khoom sib txhuam asbestos-raws li kev sib txhuam muaj tsib mus rau xya lub hauv paus sib xyaw, uas suav nrog asbestos fibers rau kev txhawb zog, ntau yam khoom siv ntxiv, thiab cov ntaub ntawv xws li roj linseed, resins, benzene suab nrov, thiab resins.Hauv kev sib piv, NAO cov ntaub ntawv sib txhuam muaj kwv yees li kaum xya qhov sib txawv ntawm cov nplaum, vim tias tshem tawm cov asbestos tsis zoo ib yam li tsuas yog hloov nws nrog kev hloov pauv, tab sis yuav tsum muaj cov sib tov loj kom ntseeg tau tias kev ua haujlwm braking sib npaug lossis tshaj qhov kev sib txhuam ntawm cov asbestos kev sib txhuam.
Post lub sij hawm: Mar-23-2022