Qhov ib puag ncig ntawm cov saw grate, tseem hu ua tag nrho qhov ntev ntawm cov saw grate, yog qhov tseem ceeb rau kev tsim thiab sib sau ua ke cov grate tsav system hauv stoker raug rho tawm haujlwm boilers. Cov saw grate tsim ib lub voj tsis kawg taug kev hla pem hauv ntej thiab nram qab ncej nrog sprockets.
Lub hauv paus ntsiab lus yog tias cov saw grate perimeter sib npaug tag nrho qhov ntev ntawm cov saw kaw uas yuav tsum tau hla ib ncig ntawm ob lub sprockets thiab hla thaj tsam grate. Kev suav yooj yim kho cov kab ke ua ob ntu ncaj thiab ob lub voj voog ncig ncig cov sprockets.
Cia L yog qhov chaw nruab nrab ntawm qhov nruab nrab ntawm lub hauv ntej thiab nram qab sprocket shafts. Cia D yog lub suab txoj kab uas hla ntawm sprockets, uas yog txoj kab uas hla ntawm cov saw pins articulate. Tag nrho perimeter P tuaj yeem kwv yees li
P=2 x L + pi x D
Cov qauv no xav tias cov saw txuas nrog cov sprockets tshaj li ib nrab ntawm txhua qhov sprocket ncig. Hauv kev xyaum, cov saw wraps me ntsis ntau dua 180 degrees, tab sis qhov kwv yees tau txais rau feem ntau cov qauv tsim ua ntej.
Rau kev xam kom raug ntau dua los ntawm kev txiav txim siab ntawm cov saw hlau, tus naj npawb ntawm cov saw txuas tau txiav txim ua ntej. Cov saw muaj kev sib txuas nrog ib lub suab p. Tus naj npawb ntawm qhov txuas N tuaj yeem suav los ntawm
N=2 x (C / p) + (Z1 + Z2) / 2 + ((Z2 - Z1) squared xp ) / ( 40 x C ) kwv yees li, qhov C yog qhov chaw nruab nrab ntawm mm, Z1 thiab Z2 yog tus naj npawb ntawm cov hniav ntawm ob lub sprockets. Rau cov saw grate, ob lub sprockets feem ntau muaj tib tus lej ntawm cov hniav, yog li Z1 sib npaug Z2. Ces tus qauv simplifies rau
N = 2 x (C / p) + Z
qhov twg Z yog tus naj npawb ntawm cov hniav ntawm ob lub sprocket. Qhov xam N yuav tsum muab sib npaug mus rau ib qho tseem ceeb vim tias cov saw txuas tuaj ua khub.
Tom qab ntawd qhov tseeb saw perimeter P yog
P = N x p
qhov twg p yog cov saw pitch hauv millimeters.
Tsis tas li ntawd, lub active grate ntev (kab rov tav projection qhov twg roj yog nqa) tsis zoo li cov saw perimeter. Lub perimeter suav nrog qhov rov qab khiav hauv qab. Hom saw grate boilers muaj lub hauv ntej sprocket tsav tsheb thiab lub rear sprocket idling. Cov saw nro yuav tsum tso cai rau qee qhov sag ntawm sab rov qab rau kev ua haujlwm kom raug.
Rau cov tswv yim engineering, cov chaw tsim khoom muab cov rooj hais txog qhov chaw nruab nrab ntawm qhov chaw deb thiab sprocket loj rau qhov xav tau ntawm cov kev sib txuas. Kev ntsuas yuav tsum suav rau cov saw hlau modulus ntawm elasticity thiab hnav nyiaj pub dawb. Ib qho kev nyab xeeb ntawm ib lossis ob qhov txuas ntxiv yog feem ntau ntxiv rau kev sib dhos thawj zaug thiab kev hloov kho nro.
Nyob rau hauv cov ntsiab lus, cov saw grate perimeter yog txiav txim los ntawm tus ncej qhov sib nrug thiab sprocket pitch txoj kab uas hla siv 2L ntxiv rau pi D, los yog ntau precisely los ntawm cov xov tooj ntawm saw txuas multiplied los ntawm lub suab. Kev suav cov perimeter kom ntseeg tau tias muaj kev sib koom tes zoo, txo qis hnav, thiab ruaj khov grate txav.
