Coal Age

MAY 2019

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18 May 2019 crushing systems continued from the shockwaves coming back through the equipment." In the event of a shutdown, the cou- pling will indicate if a torque overload and corresponding release occurred. "There will be a little bit of an oil mist and you will see there will be a brass cap missing," Klein said. "It will be very obvious that it is the SafeSet, and then you can reset it really quickly." As part of the reset, "you have to re-pressurize it," he said. "You can have these reset in 10 minutes, once they are down." That's nothing compared to the downtime resulting from a damaged motor or drive. "With breakage, you could be down for a whole shift," Klein said. For use with a crusher, the torque threshold setting on a SafeSet cou- pling is constant for the life of the coupling. "SafeSet will not fatigue at all," Klein said, and thus "will not give a false release." Company literature stated the cou- pling is rated for up to 20,000 kiloNew- ton-meters and can be configured for process-specific requirements. A similar solution that would be advantageous for certain crushing systems is Voith's SlipSet TLC. For a system processing coal from a particularly rocky seam, Slip- Set can act as a shock absorber for short-duration torque overloads. In- stead of releasing, the coupling slips temporarily, allowing the system to pass small chunks of tramp rock. It ensures continuous production, the company reported. The torque threshold can be set to the needs of the crusher system. When required, SlipSet can slip con- tinuously until the drive is stopped and the jam rectified. The couplings have been on the market for years and the feedback from customers is uniformly positive, Klein said. "On SlipSet, our custom- ers really like that because they don't have to spend the time re-pressuriz- ing it," he said. "They also have re- duced breakages on their gearboxes." One such customer, Murray Ener- gy's Ohio Valley Coal Co., was break- ing chains regularly before adopting SlipSet. "Once we installed the cou- plings, they didn't break chain for al- most six months," Klein said. Installation is easy. "Setting them is very simple," Klein said. "When you get that coupling, it will have a nameplate on it, and it will have what it needs to be set to." Further instruc- tions come with the packaging. The training offered includes on- site demos overseen by Voith and vid- eo instructions. Voith also offers the newly released Condition Monitoring System (CMS) 310, which leverages sensors mount- ed on the couplings, collects data, and provides remote users with informa- tion via an HMI panel or Web portal. "Slip angle is continuously measured and calculated to determine if and how much the TLC has slipped," the company reported. "The status infor- mation can then be used to quickly identify any need for action." The initial cost of adoption of the couplings is more than balanced by the cost-savings that result from reduced damage, maintenance and downtime, Klein said. "It is a very simple piece of equipment that will save you a lot of money," he said. "You take multiple shutdowns, all that cost, you've more than paid for that SafeSet just in the first couple of shutdowns that you prevent." To protect drives and motors, Voith's torque limit coupling, the SafeSet, is designed to release during torque spikes. (Photo: Voith) Voith's SafeSet allows a crusher to pass small chunks of tramp rock without damaging the drive or causing downtime. (Photo: Voith)

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