Single drum hoists necessitate a larger motor compared to their
friction or double drum counterparts. Unlike double drum hoists, single drum variants lack counterbalancing on the descending load, which can restrict their carrying capacity at depth. Typically utilized as service or auxiliary hoists, single drum configurations are ideal for services delivery to various levels and emergencies or loads under 4000 kg, and they efficiently serve depths up to 2000 m. Unlike their Koepe cousins these single drum winders are also very effective in both vertical and incline shafts.
Double drum hoists are suitable for depths reaching the current maximum assumed hoist depth of 2500 m, owing to the technical limitations of hoist ropes. In this design, one drum raises a full load while the other lowers an empty load. Despite their enhanced capabilities, double drum hoists require a larger motor and a robust electrical network, making them a higher-cost option compared to their friction hoist counterparts. Traditionally ground-mounted, each drum of a double drum hoist employs one rope to carry the load. With the clutching ability of double drum winders they are ideal for hoisting in mines where there is a requirement for multiple level loading, a well as being suitable for incline or vertical shafts.
Blair multi-rope hoist
Blair multi-rope hoists, also referred to as multi-rope drum hoists, serve as versatile solutions for both production and service operations. Unlike traditional drum hoists, Blair hoists utilize either one or two drums, with each drum employing two ropes to handle the load. While this configuration offers increased payload capacity compared to single rope hoists, it also introduces certain complexities.
These hoists are particularly advantageous for operations at depths exceeding 2500 meters and payloads surpassing 30,000 kg.