Yuav Ua Li Cas Txheeb Xyuas Qhov Kev Nyab Xeeb ntawm Cov Hlau Roller

Yuav Ua Li Cas Txheeb Xyuas Qhov Kev Nyab Xeeb ntawm Cov Hlau Roller

Hauv cov tshuab xa khoom lag luam, qhov kev nyab xeeb ntawm cov saw hlau txiav txim siab ncaj qha rau kev ruaj khov ntawm kev ua haujlwm ntawm cov khoom siv, lub neej ua haujlwm, thiab kev nyab xeeb ntawm tus neeg teb xov tooj. Txawm hais tias nws yog kev xa khoom hnyav hauv cov tshuab mining lossis kev xa khoom meej hauv cov kab ntau lawm, cov yam ntxwv kev nyab xeeb teeb tsa tsis raug tuaj yeem ua rau cov saw hlau tawg ua ntej lub sijhawm, cov khoom siv tsis ua haujlwm, thiab txawm tias muaj xwm txheej. Tsab xov xwm no yuav piav qhia txog yuav ua li cas txiav txim siab qhov kev nyab xeeb ntawm cov saw hlau, los ntawm cov ntsiab lus yooj yim, cov kauj ruam tseem ceeb, cov yam ntxwv cuam tshuam, mus rau cov lus qhia ua tau zoo, los pab cov engineers, cov neeg yuav khoom, thiab cov neeg saib xyuas cov khoom siv txiav txim siab raug.

I. Kev Nkag Siab Txog Qhov Kev Nyab Xeeb: Vim Li Cas Nws Thiaj Yog "Txoj Kab Sia" Ntawm Kev Xaiv Cov Saw Hlau

Tus yam ntxwv kev nyab xeeb (SF) yog qhov sib piv ntawm lub peev xwm thauj khoom tiag tiag ntawm cov saw hlau rau nws qhov kev thauj khoom ua haujlwm tiag tiag. Yeej, nws muab "qhov kev nyab xeeb" rau kev ua haujlwm ntawm cov saw hlau. Nws tsis tsuas yog them rov qab qhov tsis paub meej xws li kev hloov pauv ntawm qhov hnyav thiab kev cuam tshuam ib puag ncig, tab sis kuj npog cov kev pheej hmoo xws li kev ua yuam kev ntawm cov saw hlau thiab kev hloov pauv ntawm kev teeb tsa. Nws yog ib qho cim tseem ceeb rau kev sib npaug ntawm kev nyab xeeb thiab tus nqi.

1.1 Lub Ntsiab Lus Txhais ntawm Qhov Kev Nyab Xeeb
Cov mis rau kev xam qhov ntsuas kev nyab xeeb yog: Qhov Ntsuas Kev Nyab Xeeb (SF) = Lub Peev Xwm Thauj Khoom Rated (Fₙ) / Lub Peev Xwm Ua Haujlwm Tiag (F_w).
Lub peev xwm thauj khoom ntsuas (Fₙ): Txiav txim siab los ntawm tus tsim cov saw hlau raws li cov khoom siv, cov qauv (xws li lub suab thiab lub taub hau), thiab cov txheej txheem tsim khoom, nws feem ntau suav nrog qhov ntsuas dynamic load (qhov hnyav sib raug rau lub neej qaug zog) thiab qhov ntsuas static load (qhov hnyav sib raug rau qhov tawg tam sim ntawd). Qhov no tuaj yeem pom hauv cov ntawv teev khoom lossis hauv cov qauv xws li GB / T 1243 thiab ISO 606.
Lub Luag Haujlwm Ua Haujlwm Tiag (F_w): Lub nra hnyav tshaj plaws uas cov saw hlau tuaj yeem tiv taus thaum ua haujlwm tiag tiag. Qhov no suav nrog cov yam xws li kev poob siab thaum pib, kev thauj khoom ntau dhau, thiab kev hloov pauv ntawm qhov xwm txheej ua haujlwm, tsis yog tsuas yog lub nra hnyav uas tau xam raws li kev xav xwb.

1.2 Cov Qauv Kev Lag Luam rau Cov Yam Ntxim Saib Xyuas Kev Nyab Xeeb uas Tso Cai
Cov kev cai ntawm kev nyab xeeb sib txawv ntau heev nyob rau ntau qhov xwm txheej ntawm daim ntawv thov. Kev xa mus rau "qhov kev nyab xeeb tso cai" uas tau teev tseg los ntawm cov qauv kev lag luam lossis los ntawm cov qauv kev lag luam yog qhov tseem ceeb kom tsis txhob muaj qhov yuam kev xaiv. Cov hauv qab no yog cov ntaub ntawv siv rau cov yam ntxwv kev nyab xeeb tso cai rau cov xwm txheej ua haujlwm feem ntau (raws li GB / T 18150 thiab kev coj ua hauv kev lag luam):

II. Cov Txheej Txheem Tseem Ceeb 4-Kauj Ruam rau Kev Txheeb Xyuas Cov Yam Ntxim Saib Xyuas Kev Nyab Xeeb ntawm Cov Hlau Roller

Kev txiav txim siab qhov kev nyab xeeb tsis yog ib daim ntawv thov yooj yim; nws yuav tsum muaj kev faib ua kauj ruam raws li cov xwm txheej ua haujlwm tiag tiag kom ntseeg tau tias cov ntaub ntawv thauj khoom raug thiab txhim khu kev qha ntawm txhua kauj ruam. Cov txheej txheem hauv qab no siv tau rau feem ntau cov ntawv thov saw hlau hauv kev lag luam.

Kauj Ruam 1: Txheeb xyuas qhov peev xwm thauj khoom ntawm cov saw hlau (Fₙ).
Ua tib zoo saib xyuas cov ntaub ntawv los ntawm cov chaw tsim khoom cov khoom teev cia. Ua tib zoo saib "dynamic load rating" (feem ntau yog 1000 teev ntawm lub neej qaug zog) thiab "static load rating" (correspond to static tensile fracture) uas cim rau ntawm daim ntawv teev cia. Ob qho no yuav tsum tau siv sib cais (dynamic load rating rau dynamic load conditions, static load rating rau static load lossis low-speed conditions).
Yog tias cov ntaub ntawv piv txwv tsis muaj, kev suav tuaj yeem ua tau raws li cov qauv hauv tebchaws. Piv txwv li, siv GB/T 1243, qhov ntsuas dynamic load (F₁) ntawm cov saw hlau tuaj yeem kwv yees siv cov mis: F₁ = 270 × (d₁)¹.⁸ (d₁ yog lub taub ntawm tus pin, hauv mm). Qhov ntsuas static load (F₂) yog kwv yees li 3-5 npaug ntawm qhov ntsuas dynamic load (nyob ntawm cov khoom siv; 3 npaug rau carbon steel thiab 5 npaug rau alloy steel).

Kev kho rau cov xwm txheej ua haujlwm tshwj xeeb: Yog tias cov saw hlau ua haujlwm hauv qhov kub thiab txias tshaj 120 ° C, lossis yog tias muaj xeb (xws li hauv ib puag ncig tshuaj lom neeg), lossis yog tias muaj plua plav, qhov muaj peev xwm thauj khoom ntsuas yuav tsum tau txo qis. Feem ntau, qhov muaj peev xwm thauj khoom raug txo los ntawm 10% -15% rau txhua 100 ° C nce hauv qhov kub thiab txias; hauv cov chaw muaj xeb, qhov txo qis yog 20% ​​-30%.

Kauj Ruam 2: Xam Qhov Kev Ua Haujlwm Tiag (F_w)
Qhov hnyav ua haujlwm tiag tiag yog qhov tseem ceeb hauv kev xam qhov kev nyab xeeb thiab yuav tsum tau suav kom meej raws li hom khoom siv thiab cov xwm txheej ua haujlwm. Tsis txhob siv "qhov hnyav theoretical" ua lwm txoj hauv kev. Txheeb xyuas qhov hnyav pib (F₀): Xam qhov hnyav theoretical raws li cov khoom siv siv. Piv txwv li, qhov hnyav pib ntawm cov saw hlau conveyor = qhov hnyav ntawm cov khoom siv + qhov hnyav saw hlau + qhov hnyav ntawm txoj siv conveyor (txhua yam suav ib 'meter'); qhov hnyav pib ntawm cov saw hlau tsav = lub zog tsav × 9550 / (qhov ceev ntawm sprocket × kev ua haujlwm kis tau zoo).
Qhov Cuam Tshuam Loj Tshaj Plaws (K): Qhov no suav nrog cov khoom thauj ntxiv thaum lub sijhawm ua haujlwm tiag tiag. Cov mis yog F_w = F₀ × K, qhov twg K yog qhov cuam tshuam loj tshaj plaws thiab yuav tsum tau xaiv raws li cov xwm txheej ua haujlwm:
Qhov Cuam Tshuam Pib (K₁): 1.2-1.5 rau cov khoom siv pib mos thiab 1.5-2.5 rau cov khoom siv pib ncaj qha.
Qhov Ntsuas Overload (K₂): 1.0-1.2 rau kev ua haujlwm ruaj khov tas mus li thiab 1.2-1.8 rau kev overload tsis tu ncua (piv txwv li, crusher).
Qhov Ntsuas Kev Ua Haujlwm (K₃): 1.0 rau qhov chaw huv thiab qhuav, 1.1-1.3 rau qhov chaw noo thiab muaj plua plav, thiab 1.3-1.5 rau qhov chaw xeb.
Qhov Sib Xyaws Ua Ke K = K₁ × K₂ × K₃. Piv txwv li, rau txoj siv conveyor uas pib ncaj qha rau kev khawb av, K = 2.0 (K₁) × 1.5 (K₂) × 1.2 (K₃) = 3.6.