Engineering & Mining Journal

APR 2019

Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr

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DRAGLINE MAINTENANCE 40 E&MJ • APRIL 2019 loss in efficiency. The efficiency of the machine has a direct relationship with costs, Kallenborn explained, especially costs associated with downtime due to the older, antiquated equipment. For draglines or other equipment, such as electric shovels and mills, Hil- liard offers a line of caliper-style brakes. "These brakes are way more efficient than the original methods of braking, such as plate brakes, band brakes or shoe brakes," Kallenborn said. "Plus, finding replacement parts for those older systems is becoming more and more difficult as far as who is still supplying them if they are even available." On a dragline, the brakes are responsi- ble for managing the three motions: hoist, drag and swing. During one of his recent projects, one of Kallenborn's customers was experiencing serious issues with the dragline's swing brakes. "This operation walked their dragline a lot — like every other week — from one end of the pit to the other," Kallenborn said. "The swing brakes hold the boom in place. When they were walking the machine, the boom was moving more than it should because the brakes were unable to hold it. This was a serious concern. If they suspect the boom has been damaged, they would have to bring it down and have it inspected, which can be expensive." Hilliard installed a new set of caliper brakes and the mine is no longer having issues. "They are still walking that drag- line a lot, but now the boom is secure," Kallenborn said. This is a serious safety issue and an insurance concern. If the boom hits something, they have to bring it down and get it inspected, which is time consuming and expensive. When it comes to replacing the braking systems on a dragline, maintenance plan- The same type of Hilliard brake, a caliper that is spring-applied and pneumatically released, can be used for all three motions.

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