In Drum type hoisting devices, the li�ing medium is continuously wrapped around a drum. Unlike the friction type where the load is directly hoisted from the top, in drum type hoist the pulling mechanism is connected to a drum, which is to the other side of load across the headframe and sheaves. �e headframe and sheaves are required to center the hoisting medium in the sha� compartment. Drum hoists are the most common hoists used in North America, South Africa and South America. �ey also require the least amount of maintenance among all hoist types.
Single drum: In a single drum hoist, a rope is attached to a drum and wound and is used to hoist the load through an overhead pulley.
Single drum hoists are found to be more efficient than double drum hoists for most of the applications.
Friction( Koepe) type Unlike drum hoists, friction hoists are economic options for shallow sha�s. �ey are mounted right above the mine sha� or at the top of headframe, thus requiring less space than drum hoists. �e li�ing medium is passed over a pulley with the load connected to the one end of the li�ing medium. �e friction between the pulley and the li�ing medium aids the hoisting. �e friction between the pulley and the li�ing medium prevents the load from sliding in the opposite direction when the weight is pulled up using gears and pulleys. Developed by Frederick Koepe in 1877, the li�ing medium is not wound on a drum, and hence multiple hoists can be used near to each other. Friction hoists require more routine maintenance than drum hoists and are not suitable for hoisting from multiple loading pockets on different horizons within a sha�.
Blair multi-rope type �e Blair multi-rope hoist system is used for accessing much deeper mines and can be found in many of the world ' s deeper mines, such as in South Africa. One of the mines that use this type is the Moab Khotsong Mine where it is used up to 3,150m. It has a capacity to access a depth of up to 5,000m. www. bmgworld. net