Friction hoist Hoist (mining)

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a headframe housing friction hoist


friction (or koepe) hoists common type of hoist used in europe, asia , australia. friction hoist invented in 1877 frederick koepe. friction hoists mounted on ground above mine shaft, or @ top of headframe. friction hoists utilize tail ropes , counterweights , not have haulage rope fixed wheel, instead passed around it. tailropes , weights offset need motor overcome weight of conveyance , hoisting rope, thereby reducing required horsepower of hoisting motor 30%, overall power consumption remaining same. friction hoists, unlike drum hoists, can , use multiple ropes giving them larger payload capacity, since require larger safety factor, impractical deep shafts.


advantages

new friction hoists less expensive new drum hoists, , lead time delivery may shorter there more competition manufacturing. multi-rope friction hoists have larger lift capacity drum hoist. friction hoist smaller in diameter drum hoist same service, making easier ship , install drum hoist.


disadvantages

balanced friction hoists not suitable hoisting multiple loading pockets on different horizons within shaft, , not suitable deep shafts. friction hoists can not operate @ normal speeds if shaft bottom flooded , water reaches tail ropes.








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