66. Vim li cas cov kav hlau yuav tsum tau qaij ntawm lub kaum sab xis thaum dipped rau hauv zinc molten rau plating?

Thaum cov yeeb nkab steel tau muab tso rau hauv cov zinc molten rau galvanizing, lawv yuav tsum tau tilted ntawm lub kaum sab xis txaus, tshwj xeeb tshaj yog rau cov kav me me - txoj kab uas hla uas lub hauv paus sagging thiab dabtsi yog khoov tau tshaj tawm, yuav tsum tau muaj steeper incline. Dab tsi ua rau qhov no? Ua ntej, tsis zoo li lwm yam khoom, cov yeeb nkab steel yog hollow, cov khoom siv nrog cov khoom tsis zoo [tshwj xeeb rau cov kav me me - txoj kab uas hla ntawm 10-25 mm (3/8 "rau 1")]. Yog tsis muaj inclination kom raug thiab ceev zinc immersion, cua ntxiab tsis tuaj yeem raug ntiab tawm. Thaum ob qho tag nrho sau nrog molten zinc, lub hauv nruab nrab huab cua nthuav tawm vim cua sov, ua rau cov zinc txau tawm thiab tsim kev phom sij. Qhov no yog qhov txaus ntshai tshwj xeeb tshaj yog thaum cov kuab tshuaj tsis tau qhuav - cov dej evaporating rau hauv chav ua kom ntim ntau pua zaus, ua rau muaj kev phom sij ntawm cov zinc molten. Qhov no ua rau cov txheej txheem tsis xws li mottling ntawm cov yeeb nkab hauv phab ntsa. Thib ob, thaum lub kaum sab xis me dhau rau me me - txoj kab uas hla kav, qhov nruab nrab sagging seem thiab xaus ib txhij hu rau zinc nto. Cov rhuab ntu sai elongates, khoov rau hauv ib qho arc uas nias downward. Cov zinc tsis kam tiv thaiv qhovntsej thiaj tsis mob ntxiv, ua rau cov yeeb nkab ua rau ntawm qhov chaw. Raws li cov galvanizing turntable txuas ntxiv txo cov yeeb nkab (raws li pom hauv daim duab 3-156), cov yeeb nkab nkhaus ntawm cov cua hauv nruab nrab nthuav dav thiab txau tawm, tso cai rau lub qhov sab hauv kom ntim nrog zinc. Yog hais tias cov kuab tshuaj tsis tau qhuav, lub zog txau yuav ntau dua, ua rau cov txheej txheem muaj kev phom sij ntau dua thiab ua rau cov txheej txheem loj heev. Yog li ntawd, lub steeper inclination lub kaum sab xis yuav tsum tau rau zinc dipping ntawm steel kav. Qhov tsawg kawg nkaus lub kaum sab xis yuav tsum tiv thaiv cov kav dej los ntawm dov tom qab zinc immersion. Qhov zoo tshaj plaws configuration, raws li qhia nyob rau hauv daim duab 3-15c, zam ib tug dav ib tug -sab kev sib cuag nrog molten zinc, yog li txo thermal expansion thiab txo cov yeeb nkab dabtsi yog khoov. Qhov kev tsim no ua kom cov kav dej ruaj khov thaum lub sij hawm rotary disk immersion, tiv thaiv dov. Nyob rau tib lub sijhawm, cov pa roj tso rau hauv cov yeeb nkab qhov tuaj yeem khiav tau zoo. Kev tuav cov zinc zoo ib yam thoob plaws tag nrho cov yeeb nkab saum npoo zoo tiv thaiv kom tsis txhob xau. Lub hauv paus ntsiab lus no tau ua pov thawj tshwj xeeb hauv cov kauj ruam - hom rotary disk plating tshuab nrog lub kaum ntse ntse dipping, qhov txuas txuas txuas txuas ntxiv nthuav tawm cov teeb meem dov ntau dua, tshwj xeeb tshaj yog thaum plating cov kav dej me me. Rolling-induced to yog tshwj xeeb tshaj yog tseem ceeb thaum lub sij hawm txhuas-muaj zinc plating txheej txheem.