A nqa hoist yog ib qho cuab yeej tseem ceeb hauv kev lag luam thiab kev tsim kho, paub txog nws lub peev xwm los nqa thiab tswj cov khoom hnyav tau yooj yim. Tsis zoo li lwm cov cuab yeej nqa, lub zog hoists muaj kev txav tau yooj yim, siv tau yooj yim, thiab muaj peev xwm hla ntau yam kev siv. Rau cov lag luam thiab cov neeg cog lus, nrhiav txoj cai lever hoist kev muag khoom tuaj yeem txhais tau tias muaj txiaj ntsig zoo dua thiab kev nyab xeeb ntawm txoj haujlwm. Ntawm no, peb tshawb txog hom, kev ua haujlwm, thiab yam tseem ceeb uas cuam tshuam lever hoist nqi los pab koj ua kom paub yuav khoom.
Lever hoists, tseem hu ua ratchet hoists, yog phau ntawv nqa cov cuab yeej siv los nqa, rub, lossis ruaj khov hnyav. Nruab nrog lub zog uas tig los koom nrog lub ratchet, lub cuab yeej nqa lossis txav cov khoom thauj me me, ua rau nws zoo tagnrho rau qhov chaw thau khoom. Lawv tsim muaj xws li ib tug load saw thiab ib tug braking mechanism, uas ua kom muaj kev ruaj ntseg thiab tswj, txawm tias thaum nqa hnyav hnyav.
Cov hoists no feem ntau pom muaj nyob rau hauv kev tsim kho, kev tsim khoom, thiab cov khoom siv hauv tsev uas cov khoom hnyav yuav tsum tau txav los yog nqa. Kev lag luam uas nquag siv lever hoists muaj xws li:
Lever hoists sib txawv raws li lub peev xwm nqa, cov ntaub ntawv, thiab tsim. Qee yam uas feem ntau muaj xws li:
Xaiv txoj cai nqa hoist nyob ntawm koj qhov tshwj xeeb lifting yuav tsum, nrog rau qhov hnyav ntawm lub load, qhov siab, thiab zaus ntawm kev siv.
Cov lever hoist nqi yog txiav txim los ntawm ob peb yam, nrog rau lub peev xwm, hom, khoom siv, thiab ntxiv nta. Hauv qab no yog qee cov ntsiab lus uas ua rau tus nqi:
Thaum yuav khoom a lever hoist kev muag khoom, xav txog tej yam no:
Siab zoo nqa hoists muab ntau yam zoo, los ntawm kev ua kom muaj txiaj ntsig zoo rau kev nyab xeeb. Cov hoists zoo tuaj yeem tuav cov khoom hnyav tau zoo thiab txo qis kev ua haujlwm ntawm tes, uas, dhau los, txo qhov kev pheej hmoo ntawm kev raug mob. Nrog rau kev ua tau zoo dua thiab txo qhov hnav thiab tsim kua muag, lawv kuj muaj lub neej ntev dua, muab cov txiaj ntsig zoo tshaj lub sijhawm.
Kev nqis peev hauv txoj cai nqa hoist tuaj yeem txhim kho kev ua haujlwm zoo thiab kev nyab xeeb. Nrog rau ntau yam kev xaiv muaj, nws yog ib qho tseem ceeb rau kev soj ntsuam cov lever hoist nqi tawm tsam cov kev cai tshwj xeeb ntawm koj daim ntawv thov. Lever hoists los ntawm cov neeg muag khoom muaj npe nrov kom muaj kev nyab xeeb, ua haujlwm ntev, thiab tus nqi, txawm tias siv qee zaus lossis hnyav.