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Giant Calotte Bearing for Mining Conveyor Bridge

Conveyor Bridge Maintenance

Giant Calotte Bearing for Mining Conveyor Bridge

Federal-Mogul Powertrain, a division of Federal-Mogul Holdings Corp., has supplied its biggest-ever spherical calotte bearing, at 1.25 m in diameter, to be used in the largest moving machine in the world, a conveyor bridge produced by the TAKRAF group for surface mining.
(ed. wgeisler - 19/10/2016)
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A 1.25m (4ft) diameter calotte bearing for a conveyor bridge in lignite mining.

Stadtallendorf, Germany – Federal-Mogul Powertrain, a division of Federal-Mogul Holdings Corp., has supplied its biggest-ever spherical calotte bearing, at 1.25 m in diameter to be used in a conveyor bridge for surface mining produced by the Takraf group. This machine is said to be the largest moving machine in the world and was once described as ‘a horizontal Eiffel Tower’. The maintenance-free bearing which is lined with deva.bm, one of a range of self-lubricating bearing materials developed by Federal-Mogul Deva, will support the central structure of the conveyor bridge, carrying a vertical load up to 35 000 kN (more than 3500 tons) and accommodating structural deflections and terrain irregularities as the bridge moves.
The deva.bm sliding elements replace a previous lining of PTFE-based material and contain uniformly micro-distributed solid lubricants, expanding performance, reducing wear and enabling extended service life. Static and dynamic friction levels are also more stable, reducing the likelihood of stick-slip and the sensitivity to dirt and corrosion. According to a senior manager of Federal-Mogul Deva the challenge faced in designing and producing this special calotte bearing was to provide a replacement for the original bearing that could be installed and immediately operational in order to minimise down time. This was made possible by taking complete responsibility for the finish on the spherical ball itself, as well as the bearing surface. Installation of the deva.bm bearing into the mining conveyor bridge is scheduled to take place in late 2016.

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