Osborn, the local manufacturer of crushing and screening equipment, reported that its locally manufactured double roll crushers are proving their mettle in the tough coal industry, where they are increasingly being chosen for their low fines generation.
This is according to Elandsfontein-based Osborn product sales specialist Etienne Swanepoel, who says that Osborn has netted an order for a 4848 Double Roll Crusher from a long standing client near Delmas.
This order follows on the heels of the supply of two 3054 Osborn Double Roll Crushers, manufactured and delivered within a testing time frame, to a different coal operation in the vicinity of Lephalale, Limpopo.
“Our durable and reliable double roll crushers have earned a reputation for less fines generation due to a lower roller speed versus a rolling ring crusher. Other features that are contributing to their burgeoning success in the coal industry include their unique hexagonal drum design and lower power usage,” Swanepoel comments.
Expanding on the Osborn Double Roll Crusher’s outstanding performance and features, Swanepoel says that it is generally regarded as a 4:1 feed to product ratio crusher, but that in some instances, dependent upon material friability and hardness, it is possible to achieve a 6:1 crushing ratio.
“The feed material should enter the centre of the gap between the two rolls and spread across the full roll width for maximum efficiency, and this ensures a uniform product size distribution. For strict coal product specifications, the Osborn Double Roll Crusher is ideal.
It is important to understand the material characteristics, however, as the type of coal can often vary considerably. Hardness, rock content, friability and moisture content are the major factors that need to be identified, together with the crusher capacity, maximum lump size, required product size and the amount of fines that are acceptable.
Efficient crushing will lower the power requirements and increase the life of the crusher segments,” he stresses.
Each roll assembly comprises renewable and reversible toothed segments, bolted and keyed to a robust hexagonal hub with the nuts inside the hub, Swanepoel explains. He says that when the correct crushing ratio is used and the optimum roll diameters selected, the segments will grip the feed material more efficiently and will not allow pieces to roll on top of the segments due to the incorrect nip angle. “This assists in reducing wear.”
He notes that the crusher’s locking nuts are securely located in fabricated pockets in the drum, which allows for the removal and replacement of segments from the outside using only one tool (an Allen key).
“Bolt heads are protected from excessive wear by being counter sunk in recesses on each segment. Teeth are arranged in a staggered formation on the segments to prevent tooth on tooth impact. Tooth proportions are designed for the particular product requirements. The rolls are separately driven by two identical motors, through sets of vee belts which are connected between the gearbox pulley and the flywheels.”
In addition to double roll crushers, Osborn’s line-up of hard working, robust machines for the coal industry includes mineral sizers, rolling ring crushers, rotary coal breakers, jaw crushers, vibrating feeders and screens.
“Backing up our unrivalled range of equipment is our 24/7 service department and spare parts division. We are committed to ensuring that our clients reap the maximum benefits from our tough, reliable machines, which minimise downtime and reduce operating costs,” Swanepoel concludes.
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