1. Yuav ua li cas railway bolts pab txo cov nqi kho tsheb?
High -cov bolts ua tau zoo txo cov nqi kho mob los ntawm kev txo qis qhov xav tau kev hloov ntau zaus. Cov khoom siv ruaj khov thiab cov txheej txheem txuas ntxiv lub neej ntev, txo qhov hloov zaus thiab cov nqi zog. Ua kom nruj bolts tiv thaiv kev tsheb ciav hlau, txo kev hnav ntawm lwm yam khoom (xws li, fishplates, sleepers) uas yuav tsum tau kho thaum ntxov. Locking mechanisms (piv txwv li, xauv cov txiv ntseej) txo qhov kev xav tau rau qhov rov qab los tsis tu ncua -torquing, txuag lub sijhawm tshuaj xyuas. Hauv cov cheeb tsam uas muaj mob hnyav, corrosion{10}}cov ntsia hlau tiv thaiv kom tsis txhob raug nqi kho thaum muaj xwm txheej ceev vim xeb{11}} cuam tshuam txog kev ua tsis tiav. Thaum cov nqi pib rau cov bolts hwm yog siab dua, lawv lub neej kev pab cuam ntev dua thiab txo cov kev xav tau kev saib xyuas ua rau txo qis tag nrho cov nqi ntawm lub neej piv rau pheej yig dua, luv dua - nyob lwm txoj kev.
2. Dab tsi yog cov cim qhia tias railway bolts yuav tsum tau hloov, tsis yog nruj?
Cov cim qhia tias bolts xav tau kev hloov pauv muaj xws li pom cov kab nrib pleb (tshwj xeeb yog nyob ze ntawm lub taub hau lossis xov hauv paus), uas qhia txog kev ua haujlwm tsis muaj zog. Kev xeb loj heev uas tau noj los ntawm cov txheej thiab pitted cov hlau, txo tus ntoo khaub lig-sectional cheeb tsam, yog irreversible. Stripped threads (qhov twg cov txiv ntseej tig dawb) los yog khoov shanks cuam tshuam clamping quab yuam thiab tsis tuaj yeem kho los ntawm zawm. Bolts uas tau dhau lawm - nruj thiab pom cov tsos mob ntawm stretching (xws li, ib tug pom ntev shank) yog tsis muaj zog thiab ua rau tsis ua hauj lwm. Kev qaug zog tsis ua haujlwm, qhia los ntawm qhov ntxhib, pob txha tawg nto yog tias lub bolt tawg, txhais tau hais tias nyob ib puag ncig bolts kuj tseem nyob ze tsis ua haujlwm thiab yuav tsum tau hloov. Txhua lub ntsia liaj qhov rooj uas ua tsis tau qhov kev xeem torque (tsis tuaj yeem tuav lub zog tshwj xeeb) tom qab rov- zawm yuav tsum tau hloov kom tsis txhob muaj teeb meem yav tom ntej.
3. Yuav ua li cas railway bolts ua nyob rau hauv cov cheeb tsam uas muaj cov pa phem ntau?
Nyob rau hauv siab - tej thaj chaw muaj kuab paug (xws li, nyob ze cov chaw tsim khoom lossis cov nroog tsis khoom), taug qab cov ntsia hlau ntsib nrawm dua vim muaj cov pa phem xws li sulfur dioxide, nitrogen oxides, thiab cov khoom me me. Cov pa phem no cuam tshuam nrog cov dej noo los tsim cov kua qaub, uas tawm tsam cov hlau thiab rhuav tshem cov txheej tiv thaiv. Bolts nyob rau hauv cov cheeb tsam no feem ntau siv ntau- txheej txheej (xws li zinc nrog epoxy topcoats) los tsim ib qho kev tiv thaiv cov pa phem. Kev tu tsis tu ncua nrog cov neeg ua haujlwm nruab nrab tshem tawm cov pa phem ua ntej lawv ua rau kev puas tsuaj. High-pollution areas also require more frequent inspections (every 1-3 months) to detect early rust, and bolts may be replaced on a shorter cycle (eg, 5 years vs. 10 years in clean areas). Stainless hlau bolts, txawm tias kim, yog qee zaum siv rau hauv cov xwm txheej hnyav los tiv thaiv cov tshuaj corrosion
4. Lub luag haujlwm ntawm txoj kev tsheb ciav hlau yog dab tsi hauv kev tiv thaiv kev tsheb ciav hlau?
Rail creep-longitudinal txav ntawm txoj kab raws li cov neeg pw tsaug zog- tuaj yeem ua rau cov pob qij txha tsis sib xws thiab tsis sib xws, ua rau muaj kev pheej hmoo ntawm derailment. Taug qab bolts tiv thaiv kev nkag los ntawm kev tsim kev sib txhuam ntawm lub hauv paus kev tsheb nqaj hlau thiab pw tsaug zog, tiv thaiv cov quab yuam los ntawm lub tsheb ciav hlau log. Lub clamping quab yuam los ntawm nruj bolts kom ntseeg tau tias txoj kev tsheb ciav hlau tsis tuaj yeem xaub txheeb ze rau tus neeg pw tsaug zog, txawm tias nyob rau hauv qhov ntev ntawm kev nrawm nrawm lossis nres tsheb ciav hlau. Nyob rau hauv siab - thaj chaw muaj kev pheej hmoo (piv txwv li, qhov siab gradients lossis chaw nres tsheb tsis khoom nrog nquag nres), ntxiv bolts rau ib tus neeg pw tsaug zog ua rau muaj kev sib txhuam tag nrho, ntxiv rau kev tawm tsam. Bolts tseem ruaj ntseg tsheb thauj mus los (qhov twg siv), uas yog cov khoom siv clamped rau txoj kev tsheb ciav hlau kom tiv thaiv kev txav mus los. Loose bolts txo kev sib txhuam, tso cai rau kev nkag mus, ua rau kev kuaj lub zog tsis tu ncua tseem ceeb rau kev tiv thaiv kev nkag.
5. Yuav ua li cas railway bolts tuav thermal expansion thiab contraction ntawm rails?
Rails nthuav dav hauv tshav kub thiab cog lus hauv qhov txias, tsim kom muaj zog ntev uas tuaj yeem cuam tshuam cov bolts. Bolts yog tsim los kom haum rau me me txav thaum tuav lub zog clamping - me ntsis looseness nyob rau hauv huab cua kub tiv thaiv tshaj - zawm, thaum thermal contraction yog countered los ntawm lub bolt lub elastic zog, uas tso cai rau nws kom tsawg me ntsis tsis poob tuav. Hauv kev sib txuas txuas txuas txuas (CWR) cov kab ke, qhov uas cov ntsia hlau tau koom ua ke kom txo qis qhov sib txawv, cov bolts yuav tsum tiv taus kev ntxhov siab ntau dua, siv siab - tensile steel los tiv thaiv stretching. Kev nthuav dav cov pob qij txha nyob rau hauv tsis yog -CWR lem muaj xws li bolts nrog ntev shanks tso cai rau kev tsheb nqaj hlau txav thaum ua kom cov kev sib koom ua ke ruaj ntseg. Bolts nyob ze ntawm cov pob qij txha yog feem ntau hnav los ntawm thermal txav, yuav tsum tau soj ntsuam ntau zaus thiab lubrication los tiv thaiv kev ntes.