Ntev -lub sij hawm siv tshuab rau kev tiv thaiv corrosion thiab loosening kev tiv thaiv ntawm cov bolts
Dab tsi yog qhov tseem ceeb ib puag ncig ntawm corrosion cuam tshuam rau txoj kev tsheb ciav hlau bolts?
Atmospheric corrosion: humid cua sov, kua qaub los nag, muaj pa gases. ntsev tsuag corrosion: thaj chaw ntug dej hiav txwv, thaj chaw ntsev pas dej. De-icing agent corrosion: electrochemical corrosion los ntawm de-icing ntsev nyob rau sab qaum teb lub caij ntuj no. Stray tam sim no corrosion: subway thiab lub teeb rail seem. Crevice corrosion: oxygen-tsis muaj corrosion ntawm qhov chaw sib cuag ntawm lub ntsia liaj qhov rooj thiab lub phaj clamping / wafer. Corrosion txo bolt cross-section, puas threads, txo lub zog, thiab nws thiaj li ua rau breakage.
Dab tsi yog cov txheej txheem tseem ceeb rau kev tiv thaiv bolt loosening?
Kev tiv thaiv kev sib txhuam: lub caij nplooj ntoos hlav ntxhua khaub ncaws, ob lub txiv ntoo, nylon ntxig rau cov txiv ntseej, siv kev sib txhuam kom tsis txhob xoob. Mechanical tiv thaiv: cotter pins, xauv lub tshuab ntxhua khaub ncaws, xauv daim hlau, tiv thaiv -loosing pins, txwv lub cev kev sib hloov. Kev tiv thaiv xov: xov deformation, xov xauv cov nplaum, xauv xov cov qauv. Kev tiv thaiv tus qauv: conical nto tiv tauj, tus kheej - kaw cov qauv, preload retention design. Siab- nrawm, hnyav- cov kab thauj khoom feem ntau siv cov kev tiv thaiv sib xyaw, xws li "tus kheej-locking txiv ntseej + xauv nplaum + tiv thaiv-loosing washer".
Vim li cas thiaj yuav tsum tau preload ntawm railway rail bolts raug tswj nruj?
Tsis txaus preload: Bolts loosen sai nyob rau hauv vibration, ua rau kev sib koom tes thiab fastener tsis ua hauj lwm. Ntau dhau preload: Bolts undergo yas deformation, ua rau tensile yielding thiab qaug zog tawg. Cov qib bolt sib txawv thiab cov kab sib txawv muaj qhov tshwj xeeb torque; yuav tsum tau siv lub torque ciaj ntswj, thiab kev ua haujlwm raws li kev paub yog txwv nruj heev. Kev cuam tshuam ntawm kev sib txhuam coefficient kuj tseem yuav tsum tau txiav txim siab, vim tias qhov sib txawv ntawm qhov sib txawv ntawm lub lubricated thiab unlubricated xeev.
Kev sib piv ntawm cov txheej txheem thiab cov xwm txheej siv tau ntev -tuaj yeem tiv thaiv -corrosion bolts?
Kub-dip galvanizing: Tus nqi qis, lub zog sib txuas zoo, haum rau cov kab nrawm nrawm thiab qhib- cua ntu. Dacromet/zinc- txhuas txheej: Tsis muaj hydrogen embrittlement, zoo ntsev tsuag tshuaj tiv thaiv, haum rau siab - lub zog bolts, siab - tsheb ciav hlau ceev, subways, thiab ntug hiav txwv. Electro-galvanizing: txheej txheem yooj yim, tab sis nyias nyias, nruab nrab corrosion kuj, siv nyob rau hauv lwm qhov chaw. Stainless hlau / duplex stainless hlau: Lub neej ntev tshaj plaws corrosion kuj, siv nyob rau hauv huab cua corrosive ib puag ncig, tab sis tus nqi siab, lub zog yuav tsum sib phim.
Cov ntsiab lus tseem ceeb rau kev saib xyuas bolts?
Tsis tu ncua rov kho lub zog, tshwj xeeb tshaj yog nyob rau hauv thawj theem ntawm cov kab tshiab thiab tom qab lub caij los nag. Tshawb xyuas cov xov corrosion, bolt elongation, tawg, thiab lub taub hau deformation. Txhim kho qhov kev tiv thaiv -loosing qauv nyob rau hauv seem uas yooj yim rau loosening. Hloov cov corrosion-resistant bolts nyob rau hauv batch nyob rau hauv hnyav corroded seem. Tsis txhob sib tov bolts ntawm qib sib txawv zog.