head sheave

head sheave

[′hed ‚shēv]
(mining engineering)
Pulley in the headgear of a winding shaft over which the hoisting rope runs.
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The BMR features two independent, two-compartment drums and two ropes per drum, each of which attaches to a skip via its own head sheave. Coverage from back then reported "continuous equalization of rope tension is effected either by a simultaneous coiling or uncoiling of the ropes on a compensating drum attached to the conveyance or by movable headgear sheaves supported on interconnected hydraulic cylinders, which permit the sheaves to move in vertical guides." (1)
Pre-Qualification: Bidder should be manufacturer of head sheave pulley and should have supplied head sheave pulley of 3200 mm dia or more for mine use.
The fixed jib adaptations include a runner, head sheaves and a new hook block designed to prevent the device from becoming twisted.