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A drum hoist (steel wire rope visible) and motor. In underground mining a hoist or winder [1] is used to raise and lower conveyances within the mine shaft.Modern hoists are normally powered using electric motors, historically with direct current drives utilizing Ward Leonard control machines and later solid-state converters (), although modern large hoists use alternating current drives that ...
A headframe [1] (gallows frame, [2] winding tower, [3] hoist frame, [3] pit frame, [3] shafthead frame, [3] headgear, [3] headstock, poppethead) is the structure above an underground mine shaft, built for hoisting machines, people, and materials.
Hoist atop an elevator. A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium.
Cages may be single-, double-, or rarely triple-deck, always having multiple redundant safety systems in case of unexpected failure. The second compartment is used for one or more skips, used to hoist ore to the surface. Smaller mining operations use a skip mounted underneath the cage, rather than a separate device, while some large mines have ...
The additional cost for installing the hoist was $34,000; [9] the total cost of the project, including building, engine, installation, and ancillary structures, was $370,000. [10] The hoist operated from 1920 until the mine closed in 1931, [2] a victim of falling copper prices. [11] The building and hoist were restored in 1968 and are open to ...
The water level in the labyrinth of underground pipes began to drop, creating a vacuum in the system. Open hydrants and broken connections higher in the hills began sucking in the toxic smoky air ...
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