February 24-27, 2019
SME 2019
Denver, CO
VMS-DP Brake
Twiflex, a member of the Altra Industrial Motion Group, a leading global supplier of power transmission components, has provided a parking and emergency brake for use on hoists at a gold mine in Elko County, Nevada. The VCSD-VR brakes are installed on a motor pinion, operating on a 1.168 metre diameter disc to produce a total torque of 128 kNm.
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In the last five years, grinding units have increased considerably in capacity, resulting in a trend toward fewer comminution machines per grinding line. Today, 40 ft. diameter SAG mills and 30 ft. diameter ball mills, both with motor powers of more than 22 MW, are commonplace as mine operators look for even larger equipment to achieve greater economy of scale.
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Twiflex Ltd./Hilliard Corp. (USA) has supplied multiple braking systems to Metso Minerals Industries, Inc. for their Mount Milligan mine, located in North Central British Columbia, Canada. The open pit mining operation will provide mill feed at a nominal rate of 60,000 t/d (21.9 Mt/a). Annual mine production will average 81 m lb/year copper and 194,000 oz/year gold in concentrates.
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Twiflex, which is part of the Heavy-Duty Overrunning Clutch and Brake division of Altra Industrial Motion, supplies braking systems for both geared and gearless grinding mills. Twiflex told IM that their main focus over the last 12 months has been the development of a large mono spring (floating) spring applied, hydraulic release disc brake for the dual pinion direct drive geared mills.
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