Mechanical Technology August 2015

⎪ Materials handling and minerals processing ⎪

Early engineering for Ivanplats Platreef

To facilitate the design of the headframe structure by Murray & Roberts Cementation, FLSmidth has recently completed the early engineering contract for the production, service and auxiliary winders for Ivanplats Platreef Project No 2 Shaft. The solution involves two 6.0 m diameter Koepe winder installations at 90° to each other, with the auxiliary winder being installed on a lower level.

M ark Sheward, sales man- ager of mine shaft systems for FLSmidth, says that the Platreef minewinder engineering contract award was based on the company’s 60-plus years’ of experi- ence and an extensive reference base of installations. The largest Koepe winders previously supplied by FLSmidth are the two 6.5 metre diameter units at Impala 16 shaft and their successful implemen- tation forms the basis of the design and engineering undertaken for the Ivanplats Platreef Project winders. “Experience is critical in projects of this nature and the ability to adapt to changing conditions is one which differ- entiates FLSmidth. Each of the two 6.0 m diameter Koepe winder installations with drums, brake systems and drives needs to be accommodated within the constraints of the headframe dimensions. The solu- tion we provided involved installing the two Koepe winders at 90° to each other, with the auxiliary winder being installed on a lower level,” Sheward explains. During the early engineering phase,

FLSmidth made use of Finite Element Analysis (FEA) to establish and verify the stress loading in the final design. Other supplied data included dimensions, loads, required tolerances, stiffness re- quirements and the position and length of the anchor bolts, as well as the mass and dimensions of the major components to be lifted into the headframe. Both the production and service wind- ers are four rope friction winders. The production winder will hoist two 40 t skips, while the service winder will be equipped with a man/material cage and counterweight. The rock or production winder is being designed for a rope speed of 18 m/s while the man/material winder will operate at 10 m/s. The auxiliary winder, with a rope speed of 6.0 m/s, will be a 2.4 m diameter, 1.2 m wide single drum unit and could initially be ground- mounted and used for shaft equipping before being relocated to the head frame on completion of shaft sinking. The shaft depth is approximately 1 050 m and braking will be effected on all three winders by a four-channel

The FLSmidth 6.5 m Koepe Winders at Impala 16 Shaft showing the 90° orientation for space saving. closed loop hydraulic system incorporat- ing disc brakes. New small winder design The auxiliary winder forms part of the new small winder design, which FLSmidth has been developing over the past year. This ongoing development work allows design optimisation and a

The Ivanplats Platreef production and service winder engineering solution involves two Koepe winders at 90° to each other.

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Mechanical Technology — August 2015