A cost-effective helical gear unit from Brevini Australia was selected for installation in an underground mine elevator at a coal mine in eastern New South Wales.
A winder drive is designed to operate a lift or elevator in an underground mine. The coal mine was in the process of replacing an old personnel and equipment elevator used to transport large loads over long distances, up and down the mine shaft.
Subject to stringent safety requirements, the elevator is required to operate at two significantly different speeds while transporting people and equipment. While people are transported at high speeds, equipment is transported at 1/3rd of that speed.
The challenge was to meet the high torque requirements and large speed variations while ensuring high safety margins.
Brevini selected a cost-effective PD85 helical gear unit, the largest of the standard catalogue range of PIV drives in Germany.
Featuring a mass of 11.5 tonnes without fluids, the unit, despite its size, is available on a shorter lead time due to the use of a reduced number of parts, and having a standardised range and consistent modularity across all variants.
Brevini technicians additionally developed and installed in situ, a locally designed forced lubrication system to ensure adequate lubrication, even at the low operating speed where splash lubrication does not occur.
The resulting solution helped the elevator achieve the high torque required, as well as a high degree of safety margin.