Drum hoist Hoist (mining)

a drum hoist , motor

drum hoists common type of hoist used in north america, south africa , south america. when using drum hoist hoisting cable wound around drum when conveyance lifted. single-drum hoists can used in smaller applications, double-drum hoists allow hoisting of 2 conveyances in balance (i.e. 1 skip being lifted while second skip being lowered). drum hoists mounted on concrete slabs within hoistroom, hoisting ropes run drum, top of headframe, on sheave wheel , down connect conveyance (cage or skip).

advantages

drum hoists require less routine maintenance friction hoist, because haulage cable fixed drum, , therefore have less downtime, , maintenance regime less sophisticated. drum hoists can continue operate if shaft bottom gets flooded , less shaft depth required below loading pocket, unlike friction hoists such flooding cover tail ropes , on. because drum hoists not have tail ropes, hoisting system more suited slinging beneath conveyance.

disadvantages

drum hoists take more space friction hoist same service of haulage cable must accommodated on drum when hoist raised. drum hoists require rapid fluctuations in power demand, can pose problem if power generated on site rather provided through main power grid.