Spartan-based hydraulic systems specialist Hytec has completed the majority of orders received from project management houses involved in the Sishen Iron Ore Expansion Project (SEP).
“Through this project we have reinforced our leading position in this field without a doubt,” says Hytec Systems sales manager, Klaus Marggraff.
One of the largest single orders from the SEP came in the form of the hydraulic system for the primary apron feeder. The unit is twice the size of the largest apron feeder that the company has been involved with to date. At 6,5t each and 600 kW installed power in total, the two drive units involved are believed to be the biggest ever installed in South Africa. Hytec designed and supplied full hydraulic variable speed control through Bosch Rexroth drives.
Hytec supplied SES with the hydraulic drive system for four stockpile apron feeders with 220 kW installed power each. Due to space constraints, the company used the compact range of hydraulic motors.
The jig feeding contract involved eight hydraulic power packs, connected to proportional valve consoles that ensure smooth acceleration and deceleration of screening plates. The very low natural frequency of these plates meant that Hytec had to carefully tailor its hydraulic design.
One of the other work packages involved the manufacture of hydraulic systems for the secondary and tertiary crushing plant chute controls. The 32 hydraulic cylinders, manufactured by Hytec Engineering, range in size from 100 to 240 mm nominal bore, with a 2,4 m stroke on the largest unit. 24 valve control stations were required to complete the solution.
Hytec has recently established a Kuruman branch, to bid on any further requirements that might arise at Sishen. In the light of the large installed base of Bosch Rexroth products and components incorporated in the plant the company also plans to offer a long-term maintenance contract to the iron ore producer.
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