Yog vim li cas lub Fit txiav txim siab Joint Strength
Lub phaj phaj sib koom tsuas yog muaj zog raws li nws txoj kev thauj khoom. Cov kev tsheb ciav hlau xaus yog tuav los ntawm ob lossis plaub qhov sib koom ua ke, thiab lub log tsheb thauj khoom yog hloov los ntawm ib qho kev tsheb ciav hlau mus rau lwm qhov los ntawm cov bolts, lub qhov bar thiab lub ntsej muag bar. Yog hais tias lub qhov tsis kab, ib tug ntsia liaj qhov rooj nqa ib tug disproportionate ntawm lub load, lub sib koom ua hauj lwm xoob, lub tsheb ciav hlau xaus batter, thiab nws thiaj li ib tug bolt qaug zog thiab puas. Qhov haum - qhov txoj hauj lwm, lub qhov taub, bolt qib thiab torque - yog li tsis yog qhov nthuav dav: nws yog qhov tsim ntawm qhov sib koom ua ke.
Bolt Qhov Geometry thiab Tolerances
Fishplate qhov yuav tsum phim lub tsheb ciav hlau qhov tseeb, nrog rau txoj hauj lwm kam rau ua ntawm 0.5 hli los yog zoo dua. Qhov sib txawv ntawm 1 hli nce qhov kev ntxhov siab ntawm qhov phem tshaj -loaded ntsia liaj qhov rooj los ntawm kwv yees li 20 feem pua, thiab rov cuam tshuam ntawm kev sib koom ua tsis zoo ua rau lub pob txha qaug zog; kev tsheb ciav hlau sib cais qhov xwm txheej ntawm qhov chaw tsim kho tau taug qab los ntawm qhov laj thawj no. Qhov sib nrug raws qhov kev tsheb ciav hlau: rau 60 kg / m rails, tus txheej txheem teeb tsa lub phaj ntsia liaj qhov rooj - qhov sib nrug ntawm 140 mm. Thaum lub sij hawm installation, lub qhov taub thiab qhov sib nrug yuav tsum tau ntsuas nrog callipers thiab positioning clamps siv los tuav cov tuav kom zoo thaum lub bolts haum.
Fishplate Material Xaiv
Cov khoom siv ntses ntses yuav tsum sib phim lub zog ntawm txoj kev tsheb ciav hlau nws koom nrog. Rau hnyav-load thiab siab- cov kab nrawm, siab- lub zog alloy steel nrog quench- thiab- kev kho mob kub hnyiab yog siv los ncav cuag lub zog tensile thiab qaug zog rau kev sib koom ua ke. Rau cov kab zoo tib yam, carbon steel lossis qis- alloy steel sib npaug kev ua haujlwm thiab tus nqi. Ob qhov kev xav tau ntxiv rau hauv txhua rooj plaub: kev ua kom tawv, yog li lub bar khoov es tsis txhob tawg nyob rau hauv kev cuam tshuam, nrog qis- qhov kub thiab txias tau txheeb xyuas qhov chaw txias; thiab kev tiv thaiv corrosion, feem ntau kub-dip galvanizing nrog zinc txheej tsawg kawg yog 85 micrometers rau qhov chaw ntub thiab corrosive. Cov khoom siv thiab qhov ntev yog txiav txim siab raws li cov qauv kev tsheb nqaj hlau uas siv tau xws li TB / T 2347 lossis UIC thiab AREMA series.
Bolt Qib: 8.8 vs 10.9
| Khoom | Qib 8.8 | Qib 10.9 |
|---|---|---|
| Tsawg kawg tensile zog | 800 MPa | 1040 MPa |
| Yam tsawg kawg yield zog | 640 MPa ua | 940 MPa ua |
| Hardness | 22-32 HRC | 33-39 HRC |
| Kev siv rail | 50 kg / m rail thiab qis dua | 60 kg/m rail thiab siab tshaj, siab -ceev, hnyav{2}}load |
| Nqi | qis | Siab dua |
Qib 8.8 bolts nqa cov khoom ntawm cov kab zoo tib yam thiab kev lag luam kev lag luam. Qib 10.9 bolts ntxiv lub zog thiab qaug zog ua haujlwm uas siab - zaus, siab -load pob qij txha xav tau. Kev xaiv yog ib qho kev ntsuas tag nrho ntawm kev tsheb ciav hlau, kev thauj khoom thiab kev khiav hauj lwm ceev - nyob rau hauv -txhais txog kev pheej hmoo ntawm kev sib koom ua haujlwm tsis ua haujlwm, tshaj - qhia txog kev nce nqi tsis muaj txiaj ntsig.
Kev kho saum npoo thiab tiv thaiv-Kev xyaum ua kom xoob
Bolt nto kho muaj nyob rau kom lub fastener serviceable rau nws tag nrho lub neej. Kub-dip galvanizing nrog zinc txheej tsawg kawg yog 85 micrometers haum rau cov av noo, nag, daus thiab me ntsis saline- ib puag ncig alkaline thiab tuaj yeem ua rau xeb- lub neej dawb tshaj 10 xyoo. Blackening, tshuaj lom neeg oxide zaj duab xis, yog pheej yig dua tab sis tsis muaj zog thiab haum rau tsuas yog qhuav sab hauv tsev lossis luv luv - daim ntawv thov kev lag luam. Qhov twg corrosion thiab hnav ua ke ua ke - ntug hiav txwv ntsev tsuag, plua plav mines - zinc-aluminium flake txheej muaj sia nyob ntau dua 1000 teev ntawm kev tshuaj ntsuam ntsev ntsev thiab yog qhov kev xaiv rau siab - lub zog bolting. Tsis kho bolts xeb nyob rau hauv ib mus rau ob lub hlis sab nraum zoov, jamming threads thiab rhuav tshem lub clamping quab yuam.
Anti-loos pib ntawm kev teeb tsa. Bolts yog nruj nreem diagonally thiab kauj ruam yog kauj ruam: ua ntej-tighten ob diagonally opposite bolts, ces tus so nyob rau hauv ib ntus, yog li ntawd lub fishplate yog loaded tusyees es tsis txhob rub mus rau ib sab. Torque yuav tsum ua raws li cov lus qhia ntawm kev tsheb ciav hlau - rau 60 kg / m rails, qib 10.9 bolts yog nruj rau 280-320 N-m. Tsawg torque loosens, ntau dhau strips cov xov. Nyob rau hauv hnyav- cov kab thauj khoom, ib qho kev tiv thaiv- xoob nplaum siv rau cov xov ua kom tiav thiab tiv taus qhov siab - zaus kev co ntawm kev khiav tsheb, thiab toothed anti- loosening washers ntxiv kev sib txhuam uas nres lub ntsia liaj qhov rooj rotating rov qab nyob rau hauv alternating load. Torque rov kuaj xyuas tsis tu ncua, txhua hli rau thawj peb lub hlis tom qab qhib kab, tom qab ntawd ntawm lub sijhawm tu kab.
Cov lus nug nquag
Vim li cas thiaj yuav tsum bolt qhov sib tw hauv 0.5 hli?
Vim hais tias ib lub qhov misaligned loads ib lub bolt disproportionately. Qhov sib txawv ntawm 1 hli ua rau muaj kev ntxhov siab ntawm ib lub bolts li ntawm 20 feem pua thiab teeb tsa bolt qaug zog tawg hauv kev tsheb.
Yam bolt qib twg xav tau rau 60 kg / m rails?
Qib 10.9, nrog 1040 MPa tensile thiab 940 MPa yield zog, yog tus qauv rau 60 kg / m thiab hnyav rails, siab - ceev thiab hnyav - cov kab. Qib 8.8 haum rau 50 kg / m rails thiab hauv qab no.
Dab tsi yog zinc txheej thickness xav tau?
Kub-dip galvanizing rau ntses phaj thiab bolts yuav tsum tso nyiaj tsawg kawg yog 85 micrometers zinc. Qhov tuab ntawd ua rau muaj qhov thaiv ntom ntom uas cais cov hlau los ntawm huab cua thiab noo noo thiab txhawb nqa xeb - kev pabcuam pub dawb tshaj li 10 xyoo hauv cov av ntub.
Yuav ua li cas torque fishplate bolts yuav tsum nruj rau?
Rau qib 10.9 bolts ntawm 60 kg / m rails, 280-320 N-m. Tus nqi yuav tsum ua raws li cov lus qhia rail; torque yog siv nrog ib tug calibrated ciaj ntswj nyob rau hauv ib tug kab pheeb ces kaum kauj ruam -by-step sequence.
Vim li cas zawm diagonally?
Diagonal tightening loads lub phaj sib npaug ntawm qhov sib koom ua ke. Tightening nyob rau hauv ib lub voj voog rub lub bar mus rau ib sab thiab concentrates kev ntxhov siab nyob rau hauv thawj bolts nruj.
Thaum twg yog anti-loosing adhesive justified?
Nyob rau hnyav-load thiab siab- cov kab vibration qhov chaw sib hloov ntawm cov tsheb yuav txwv tsis pub cov bolts xoob. Cov nplaum ua rau cov xov tshem tawm thiab tuav lub pre- nro, thiab cov hniav ntxuav hniav tuaj yeem ntxiv rau tib lub hom phiaj.