Nco ntsoov cov kev paub hauv tsev kawm txog cov qauv yooj yim? Thaiv, kev qiv … Qhov tseem ceeb ntawm lawv kev ua haujlwm yog pom tseeb, thiab, txawm tias lawv tau yooj yim, lawv siv tau txiaj ntsig niaj hnub no, thiab peb nquag siv lawv tsis tsuas yog siv nyob rau hauv lub neej txhua hnub, tab sis kuj rau cov hom phiaj kev lag luam.
Txawm nyob hauv tsev kawm ntawv, peb txhua tus mus ntawm lub tswv yim ntawm kev txav mus ruaj khov thiab ruaj khov, lawv lub hom phiaj thiab cov laj thawj ntawm kev siv. Cia kuv nco koj tias lub axis ntawm lub chaw nres tsheb ruaj ruaj khov kho (lub chaw ntawm daim duab nyob sab laug), thiab lub axis ntawm rooj noj ib qho, feem, yog txav tau. Lub tsev txav tau tso cai rau koj kom tau txais qhov nce hauv lub zog, qhov ruaj ruaj hloov pauv cov kev taw qhia ntawm lub zog thov kom rub lub nra. Kev sib xyaw ua ke ntawm cov txav tau thiab ruaj ruaj tuaj yeem, nyob ntawm tus tsim, muab cov peev xwm sib txawv. Thiab lawv tau hu ua - pulley block.
Yog li, lub rub thaiv hluav taws xob yog qhov sib txuam ntawm cov txav tau thiab ruaj khov uas mus ncig ntawm txoj hlua lossis saw hlau, tsim kom nce qhov nce hauv lub zog lossis nrawm.
Ib qho piv txwv ntawm cov saw hoist uas yooj yim tshaj plaws yog txav tau txav tau (hauv daim duab - hauv nruab nrab). Siv cov kev thaiv no, raws li txoj cai ntawm kev siv tshuab, peb tau txais ob zaug ntawm lub zog, uas yog, peb tuaj yeem nqa lub nra uas nws qhov hnyav yuav yog ob zaug quab yuam siv rau qhov kawg ntawm txoj hlua (txawm hais tias yuav poob nyob rau hauv qhov kev ncua deb, uas yog, lub nra yuav nqa mus rau qhov siab ib nrab ntawm qhov ntev ntawm txoj hlua khi). Raws li, los ntawm kev ua cov qauv tsis yooj yim, siv cov kev sib txuas ntawm cov khoom txawb thiab kev sib cais, nws yog qhov ua tau kom tau txais qhov nce ntxiv hauv lub zog thiab ntau lub sijhawm.
Nws yog qhov nyuaj rau sau tag nrho cov chaw ntawm kev siv ntawm cov saw hoist, tab sis nws tsim nyog hais txog kev nqa khoom, piv txwv, xws li rigging li, cranes.
