Nyob rau hauv 10 BC, tus kws kes duab vajtse Roman thaum ub Vitruvius piav txog lub tshuab nqa hauv nws phau ntawv architectural.Lub tshuab no muaj lub mast, sab saum toj ntawm mast yog nruab nrog ib tug pulley, txoj hauj lwm ntawm lub mast yog tsau los ntawm ib tug rub hlua, thiab lub cable hla lub pulley yog rub los ntawm ib tug winch los nqa cov khoom hnyav.
Nyob rau hauv lub xyoo pua 15th, Ltalis tau tsim lub jib crane los daws qhov teeb meem no.Lub crane muaj ib tug inclined cantilever nrog ib tug pulley nyob rau sab saum toj ntawm caj npab, uas yuav tsum tau nqa thiab tig.
Nyob rau hauv nruab nrab thiab lig xyoo pua 18th, tom qab watt txhim kho thiab tsim lub tshuab nqus tsev vacuum, nws muab lub zog rau lub tshuab hoisting.Xyoo 1805, Glen engineer Lenny tau tsim thawj pawg ntawm chav cranes rau London dock.Xyoo 1846, Armstrong ntawm Askiv tau hloov lub zog crane hauv Newcastle dock rau hauv hydraulic crane.
Thaum pib ntawm lub xyoo pua 20th, ntauwd cranes tau siv nyob rau hauv Tebchaws Europe,
Lub crane feem ntau suav nrog kev nqa mechanism, kev ua haujlwm mechanism, luffing mechanism, slewing mechanism thiab hlau qauv.Lifting mechanism yog qhov yooj yim ua haujlwm ntawm crane, uas feem ntau yog tsim los ntawm kev ncua thiab winch, nrog rau nqa cov khoom hnyav los ntawm hydraulic system.
Cov txheej txheem kev khiav hauj lwm yog siv los txav cov khoom hnyav longitudinally thiab horizontally lossis kho qhov chaw ua haujlwm ntawm crane.Nws feem ntau yog tsim los ntawm lub cev muaj zog, reducer, nres thiab lub log.Lub luffing mechanism tsuas yog nruab rau ntawm jib crane.Lub amplitude txo qis thaum lub jib nce thiab nce thaum nws qis dua.Nws muab faib ua qhov sib npaug luffing thiab unbalanced luffing.Lub slewing mechanism yog siv los tig lub boom thiab yog tsim los ntawm ib tug tsav tsheb thiab ib tug slewing bearing ntaus ntawv.Cov qauv hlau yog lub hauv paus ntawm lub crane.Lub ntsiab bearing qhov chaw xws li choj, boom thiab gantry yuav ua tau lub thawv qauv, truss qauv los yog lub web qauv, thiab ib co yuav siv tau cov seem steel raws li lub txhawb nqa beam.
Post lub sij hawm: Oct-30-2021