AFC Chain Management Strategy Extens Life and Prevents Unplanned Downtime
Mining sawtuaj yeem ua lossis tawg ua haujlwm. Thaum feem ntau cov mines longwall siv 42 mm saw lossis siab dua ntawm lawv cov armored face conveyors (AFCs), ntau lub mines khiav 48-mm thiab qee qhov khiav saw loj li 65 hli. Cov kab uas loj dua tuaj yeem txuas lub neej ntev. Longwall cov tswv lag luam feem ntau cia siab tias yuav dhau 11 lab tons nrog qhov ntau thiab tsawg 48-mm thiab ntau npaum li 20 lab tons nrog qhov ntau thiab tsawg 65-mm ua ntej cov saw hlau raug tshem tawm. Chain nyob rau hauv cov loj loj no yog kim tab sis tsim nyog nws yog hais tias ib tug tag nrho vaj huam sib luag los yog ob tug yuav tsum mined yam tsis muaj ib tug kaw vim saws tsis ua hauj lwm. Tab sis, yog tias cov saw hlau tawg tshwm sim vim kev tswj tsis raug, kev tswj tsis raug, kev saib xyuas tsis raug, lossis vim muaj kev cuam tshuam ib puag ncig uas tuaj yeem ua rau muaj kev ntxhov siab corrosion tawg (SCC), lub mine ntsib teeb meem loj. Hauv qhov xwm txheej no, tus nqi them rau cov saw hlau ntawd dhau los ua moot.
Yog tias tus neeg tsav tsheb ntev tsis tau khiav cov saw hlau zoo tshaj plaws rau cov xwm txheej ntawm lub mine, ib qho kev kaw tsis tau npaj tseg tuaj yeem yooj yim tshem tawm cov nqi txuag tau khaws cia thaum lub sijhawm yuav khoom. Yog li dab tsi yuav tsum yog tus neeg ua haujlwm longwall ua? Lawv yuav tsum tau ua tib zoo saib xyuas qhov chaw tshwj xeeb thiab xaiv cov saw hlau kom zoo. Tom qab cov saw hlau tau yuav, lawv yuav tsum siv sijhawm ntxiv thiab nyiaj txiag tsim nyog los tswj cov peev txheej zoo. Qhov no tuaj yeem them cov nyiaj faib tseem ceeb.
Kev kho cua sov tuaj yeem ua rau cov saw hlau muaj zog, txo nws cov brittleness, txo cov kev ntxhov siab sab hauv, ua kom hnav tsis kam, lossis txhim kho cov saw hlau machinability. Kev kho cua sov tau dhau los ua ib daim duab zoo nkauj thiab txawv ntawm cov chaw tsim khoom rau cov chaw tsim khoom. Lub hom phiaj yog kom tau txais qhov sib npaug ntawm cov khoom hlau kom zoo tshaj plaws rau cov khoom ua haujlwm. Kev sib txawv ntawm cov saw hlau sib txawv yog ib qho ntawm cov txheej txheem ntau dua uas siv los ntawm Parsons Chain qhov twg cov yas ntawm cov saw txuas tseem nyuaj los tiv thaiv hnav thiab ob txhais ceg yog tias cov kev sib txuas yog softer hauv kev ua kom tawv thiab ductility hauv kev pabcuam.
Hardness yog lub peev xwm los tiv thaiv hnav thiab yog qhia los ntawm Brinell hardness tooj los ntawm lub cim HB los yog Vickers hardness tooj (HB). Vickers hardness scale yog proportional tiag tiag, yog li cov khoom ntawm 800 HV yog yim zaug nyuaj li ib qho hardness ntawm 100 HV. Nws yog li muab ib tug rational scale ntawm hardness los ntawm softest mus rau hardest khoom. Rau qhov qis hardness qhov tseem ceeb, txog li 300, Vickers thiab Brinell hardness tshwm sim yog kwv yees li qub, tab sis rau cov txiaj ntsig siab dua Brinell cov txiaj ntsig qis dua vim muaj kev cuam tshuam ntawm pob indenter.
Charpy Impact Test yog ib qho kev ntsuas ntawm brittleness ntawm cov khoom tuaj yeem tau txais los ntawm qhov kev sim cuam tshuam. Cov saw txuas yog notched ntawm lub weld point ntawm qhov txuas thiab muab tso rau hauv txoj kev ntawm lub viav vias pendulum, lub zog yuav tsum tau tawg cov qauv ntsuas los ntawm kev txo qis ntawm lub viav vias ntawm lub pendulum.
Cov tuam txhab lag luam feem ntau txuag tau ob peb meters ntawm txhua qhov kev txiav txim kom tso cai rau kev sim ua kom puas tsuaj tag nrho. Tag nrho cov qhabnias thiab daim ntawv pov thawj yog ib txwm muab nrog cov saw hlau uas ib txwm xa tuaj rau hauv 50-m sib tw ua khub. Elongation ntawm kev sim quab yuam thiab tag nrho elongation ntawm pob txha kuj tau teeb tsa thaum lub sij hawm kuaj kev puas tsuaj no.
Qhov Zoo Tshaj Plaws
Lub hom phiaj yog los muab tag nrho cov yam ntxwv no los tsim cov saw hlau zoo tshaj plaws, uas suav nrog kev ua haujlwm hauv qab no:
• Siab zog tensile;
• Kev tiv thaiv siab dua rau kev sib txuas sab hauv;
• Siab tsis kam rau sprocket puas tsuaj;
• Ntau dua tiv thaiv martensitic tawg;
• Txhim kho toughness;
• Ua kom qaug zog lub neej; thiab
• Resistance rau SCC.
Txawm li cas los xij, tsis muaj ib qho kev daws teeb meem zoo tshaj plaws, tsuas yog ntau yam kev cuam tshuam. Lub ntsiab lus siab yield yuav ua rau muaj kev ntxhov siab ntau ntxiv, yog tias muaj kev cuam tshuam nrog kev ua haujlwm siab kom nce hnav tsis kam, nws kuj tseem yuav txo qis toughness thiab tsis kam rau kev ntxhov siab corrosion.
Cov neeg tsim khoom tseem niaj hnub siv zog los tsim cov saw hlau uas yuav ua haujlwm ntev dua thiab muaj sia nyob cov xwm txheej nyuaj. Qee cov tuam txhab lag luam galvanize cov saw hlau los cuam tshuam nrog corrosive ib puag ncig. Lwm qhov kev xaiv yog COR-X saw, uas yog tsim los ntawm patented vanadium, npib tsib xee, chromium, thiab molybdenum alloy sib ntaus SCC. Dab tsi ua rau qhov kev daws teeb meem tshwj xeeb yog tias cov khoom tiv thaiv kev ntxhov siab corrosion yog homogenous thoob plaws hauv cov saw hlau metallurgical qauv thiab nws cov txiaj ntsig tsis hloov pauv raws li cov saw hnav. COR-X tau ua pov thawj los ua kom cov saw hlau muaj sia nyob hauv cov cheeb tsam corrosive thiab zoo li tshem tawm tsis ua haujlwm vim muaj kev ntxhov siab corrosion. Cov kev ntsuam xyuas tau tsim tias kev tawg thiab kev ua haujlwm yog nce 10%. Kev cuam tshuam ntawm kev cuam tshuam yog nce 40% thiab tsis kam rau SCC yog nce 350% piv rau cov saw tsis tu ncua (DIN 22252).
Muaj cov piv txwv uas COR-X 48 mm saw tau khiav 11 lab tons yam tsis muaj kev cuam tshuam txog cov saw hlau ua ntej raug tshem tawm. Thiab thawj zaug OEM Broadband saw installation los ntawm Joy ntawm BHP Billiton San Juan mine khiav Parsons COR-X saw hlau tsim nyob rau hauv UK, uas tau hais tias tau thauj mus txog 20 lab tons ntawm lub ntsej muag thaum nws lub neej.
Rov qab chains mus txuas ntxiv lub neej saw
Qhov laj thawj tseem ceeb ntawm cov saw hnav yog qhov txav ntawm txhua qhov txuas ntsug rotating nyob ib ncig ntawm nws cov kab rov tav txuas uas nyob ib sab thaum nws nkag mus thiab tawm ntawm qhov tsav sprocket. Qhov no kuj ua rau muaj kev hnav ntau dua nyob rau hauv ib lub dav hlau ntawm cov kev sib txuas thaum lawv tig los ntawm lub sprocket, yog li ib txoj hauv kev zoo tshaj plaws los txuas lub neej ntawm cov saw siv yog tig, lossis thim rov qab 180º kom khiav cov saw hlau nyob rau hauv qhov sib txawv. . Qhov no yuav ua rau "tsis siv" qhov chaw ntawm cov kev sib txuas mus ua haujlwm thiab ua rau tsis muaj qhov sib txuas hauv cheeb tsam thiab qhov sib npaug rau lub neej ntev dua.
Kev thauj khoom tsis sib xws ntawm cov khoom siv thauj khoom, vim muaj ntau yam laj thawj, tuaj yeem ua rau tsis sib xws ntawm ob txoj hlua khi ua rau ib txoj hlua hnav sai dua lwm qhov. Kev hnav tsis sib xws lossis ncab hauv ob lossis ob qho tib si ntawm ob txoj hlua raws li tuaj yeem tshwm sim nrog ob lub rooj sib tham sab nraud tuaj yeem ua rau lub davhlau tsis sib haum, lossis tawm ntawm kauj ruam thaum lawv mus ncig ntawm lub tshuab tsav. Qhov no kuj tuaj yeem tshwm sim los ntawm ib qho ntawm ob txoj hlua ua slack. Qhov no tawm ntawm qhov sib npaug yuav ua rau muaj teeb meem kev ua haujlwm, nrog rau ua rau hnav ntau dhau thiab ua rau muaj kev puas tsuaj rau cov tsav sprockets.
Qhov System Tensioning
Yuav tsum muaj kev sib koom ua ke tensioning thiab txij nkawm kev pab cuam los xyuas kom meej tias tom qab kev teeb tsa tus nqi ntawm cov saw yog tswj nrog ob lub chains elongating vim hnav ntawm tus nqi tswj thiab sib piv.
Raws li kev saib xyuas, cov neeg ua haujlwm saib xyuas yuav ntsuas cov saw hnav nrog rau qhov nro, hloov cov saw hlau thaum nws hnav ntau dua 3%. Txhawm rau kom txaus siab qhov qib ntawm cov saw hnav no txhais tau li cas hauv cov ntsiab lus tiag tiag, nws yuav tsum nco ntsoov tias ntawm 200-m ntev lub ntsej muag, saw hnav ntawm 3% qhia txog qhov nce ntawm cov saw ntev ntawm 12 m rau txhua txoj hlua. Cov neeg ua haujlwm saib xyuas kuj tseem yuav hloov cov khoom xa tuaj thiab xa rov qab sprockets thiab strippers raws li cov no tau hnav lossis puas, tshuaj xyuas lub gearbox thiab roj qib thiab xyuas kom meej, nyob rau lub sijhawm tsis tu ncua, cov bolts nruj.
Muaj cov txheej txheem tsim tau zoo ntawm kev suav cov qib raug ntawm pretension thiab cov pov thawj no yog ib qho txiaj ntsig zoo rau kev pib qhov tseem ceeb. Txawm li cas los xij, txoj kev txhim khu kev qha tshaj plaws yog saib cov saw hlau thaum nws tawm ntawm lub tshuab hluav taws xob thaum lub AFC ua haujlwm nyob rau hauv tag nrho cov xwm txheej. Cov saw yuav tsum tau pom tsuas yog qhia qhov tsawg kawg nkaus ntawm slack (ob qhov txuas) raws li nws strips ntawm tus tsav sprocket. Thaum xws li ib theem muaj qhov pretension yuav tsum tau ntsuas, kaw thiab teem rau yav tom ntej raws li kev khiav hauj lwm theem rau lub ntsej muag tshwj xeeb. Kev nyeem ntawv ua ntej nro yuav tsum tau ua tsis tu ncua thiab cov lej ntawm cov ntawv txuas tau raug kaw. Qhov no yuav muab kev ceeb toom ntxov ntawm qhov pib ntawm kev coj txawv txawv lossis hnav ntau dhau.
Bent flights yuav tsum ncaj los yog hloov yam tsis muaj ncua sij hawm. Lawv txo qhov kev ua tau zoo ntawm lub conveyor thiab tej zaum yuav ua rau lub bar poob tawm ntawm cov haiv neeg hauv qab thiab dhia ntawm lub sprocket ua rau kev puas tsuaj rau ob lub chains, lub sprocket, thiab lub davhlau tuav.
Longwall cov tswv lag luam yuav tsum nyob twj ywm rau ntawm kev ceeb toom rau hnav thiab puas cov saw strippers vim tias lawv tuaj yeem tso cov saw slack nyob hauv cov sprocket thiab qhov no yuav ua rau muaj kev cuam tshuam thiab kev puas tsuaj.
Chain Management pib thaum nruab
Qhov kev xav tau ntawm txoj kab ncaj nraim tsis tuaj yeem hais meej. Ib qho kev sib txawv hauv kev sib txawv ntawm lub ntsej muag yuav ua rau muaj kev sib txawv ntawm kev sib txawv ntawm lub ntsej muag- thiab gob-sab chains ua rau hnav tsis sib xws. Qhov no feem ntau yuav tshwm sim ntawm lub ntsej muag tshiab uas tau tsim los ntawm cov saw hlau khiav los ntawm lub sijhawm "pob txaj hauv" lub sijhawm.
Thaum tus qauv coj txawv txawv tau tsim nws yog qhov tsis tuaj yeem rov kho dua. Ntau zaus tshaj qhov tsis sib txawv txuas ntxiv mus ntxiv nrog slack saw hnav los tsim ntau slack.
Cov teebmeem tsis zoo ntawm kev khiav nrog lub ntsej muag tsis zoo ua rau muaj kev hloov pauv ntau dhau ntawm sab rau sab kev ua phem yog qhia los ntawm kev tshuaj xyuas cov lej. Ua piv txwv, 1,000-ft longwall nrog 42-mm AFC saw uas muaj kwv yees li 4,000 txuas hauv txhua sab. Kev lees txais tias kev tshem tawm ntawm interlink hnav-hlau yuav tshwm sim ntawm ob qhov kawg ntawm qhov txuas. Cov saw hlau muaj 8,000 cov ntsiab lus uas cov hlau tau hnav los ntawm kev sib txuas sib txuas thaum nws tau tsav thiab thaum nws vibrates ntawm lub ntsej muag, raug kev poob siab los yog cuam tshuam los ntawm corrosive nres. Yog li ntawd, rau txhua 1/1,000-nti ntawm hnav peb tsim 8 nti ntawm qhov ntev. Txhua qhov sib txawv me ntsis ntawm lub ntsej muag- thiab gob-sab coj tus nqi, coj los ntawm qhov tsis sib xws, nrawm nrawm mus rau qhov sib txawv loj hauv cov saw ntev.
Ob lub forgings ntawm lub sprocket nyob rau tib lub sijhawm tuaj yeem ua rau hnav tsis zoo ntawm cov hniav profile. Qhov no yog vim qhov poob ntawm qhov chaw zoo nyob rau hauv tus tsav sprocket uas tso cai rau qhov txuas mus swb ntawm cov hniav tsav tsheb. Qhov kev ua zawv zawg no txiav rau hauv qhov txuas thiab tseem ua rau kom hnav tus nqi ntawm cov hniav sprocket. Thaum tsim los ua tus qauv hnav, nws tsuas tuaj yeem ua kom nrawm. Ntawm thawj lub cim ntawm kev txiav ntawm qhov txuas, cov sprockets yuav tsum tau kuaj xyuas thiab hloov yog tias lawv xav tau, ua ntej kev puas tsuaj puas tsuaj rau cov saw hlau.
Chain pretension uas siab dhau yuav ua rau hnav ntau dhau ntawm ob lub saw thiab sprocket. Chain pretensions yuav tsum tau tsim los ntawm qhov tseem ceeb uas tiv thaiv kev tsim cov saw hlau ntau dhau los ntawm kev thauj khoom tag nrho. Cov xwm txheej zoo li no yuav tso cai rau cov kab nrib pleb kom "flicked" thiab qhov kev pheej hmoo ntawm kev puas tsuaj rau tus Tsov tus tw sprocket tshwm sim los ntawm cov saw bunching raws li nws tawm ntawm sprocket. Yog hais tias pretensions tau teem siab dhau lawm, muaj ob qho kev phom sij: exaggerated inter txuas hnav ntawm cov saw, thiab exaggerated hnav ntawm tsav sprockets.
Cov kab nrib pleb ntau dhau tuaj yeem yog tus neeg tua neeg
Qhov feem ntau nyiam yog khiav cov saw nruj heev. Lub hom phiaj yuav tsum tsis tu ncua xyuas lub pretension thiab tshem tawm slack saw los ntawm ob qhov txuas ntxiv. Ntau tshaj li ob qhov txuas yuav qhia tau tias cov saw hlau tsis dhau los yog kev tshem tawm ntawm plaub qhov txuas yuav ua rau muaj kev ntxhov siab heev uas yuav ua rau muaj kev cuam tshuam hnyav hnyav thiab yuav txo tau txoj sia ntawm cov saw hlau.
Piv txwv tias lub ntsej muag kev sib raug zoo yog qhov zoo, tus nqi ntawm pretension nyob rau hauv ib sab yuav tsum tsis txhob tshaj tus nqi nyob rau hauv lwm yam los ntawm ntau tshaj ib tuj. Kev tswj lub ntsej muag zoo yuav tsum xyuas kom meej tias txhua qhov sib txawv tuaj yeem tuav tsis pub ntau tshaj ob tons thoob plaws lub neej ua haujlwm ntawm cov saw hlau.
Qhov nce ntawm qhov ntev vim yog kev sib txuas hnav (qee zaum hu ua "txoj hlua stretch") tuaj yeem tso cai kom ncav cuag 2% thiab tseem khiav nrog cov sprockets tshiab.
Lub degree ntawm interlink hnav tsis yog ib qho teeb meem yog cov saw thiab sprockets hnav ua ke yog li khaws lawv cov compatibility. Txawm li cas los xij, kev hnav khaub ncaws interlink ua rau txo qis hauv cov saw hlau tawg thiab tiv thaiv kev poob siab.
Ib txoj hauv kev yooj yim ntawm kev ntsuas kev sib cuam tshuam yog siv lub caliper, ntsuas hauv tsib lub suab thiab siv rau cov kab ntawv elongation. Chains feem ntau yuav raug txiav txim siab rau kev hloov pauv thaum sib cuam tshuam hnav tshaj 3%. Qee cov neeg saib xyuas kev saib xyuas tsis nyiam pom lawv cov saw ntau tshaj 2% elongation.
Kev tswj cov saw hlau zoo pib ntawm theem kev teeb tsa. Kev saib xyuas hnyav nrog kev kho yog xav tau thaum lub txaj pw hauv lub sijhawm yuav pab ua kom lub neej ntev thiab tsis muaj teeb meem.
(Nrog kev saib xyuas ntawmEllton Longwall)
Post lub sij hawm: Sep-26-2022