Conveyor drives power quarry expansion

Bonfiglioli is supplying a total of 72 bevel helical geared motors especially suited to demanding materials handling tasks to a Brisbane supplier of road base products, Karreman Quarries, according to the company.

The drives —from A50 to HDO130 (5.5 kW to 110 kW) — include the latest HDO bevel helical units that are the result of more than three years development, says Bonfiglioli Transmission (Australia) Pty Ltd managing director Malcolm Lewis.

“They produce outstanding reliability and torque densities to record values,” he said.

“The new drives — which will be used by Karreman Quarries to power conveyors — feature excellent torque distribution across their entire ratio range, with gear ratios laid out in close progression and the drives having a rugged capacity to cope with the shock and impact of intermittent loads.

“This latest order from Karremans will be integral to their expansion in the Brisbane and South East Queensland regions, which are among Australia’s fastest growing regions.

“Karreman Quarries is currently quarrying two million tonnes of road base, aggregate and rock each year, supplying major customers such as Queensland Main Roads and the Brisbane Port Authority. They pride themselves on their reputation for efficiency and reliability, and specify drives technology that will deliver this result day in and day out.”

Lewis says lengthy R&D went into producing the new HDP parallel shaft and HDO bevel helical units to 72,000 Nm.

According to the company, finite element analysis and multi-body simulations, according to Lewis, were used to identify the stress pattern on each of the main components and to optimise the design for: system structural stiffness; gear geometry; shaft deflection; extended gear and bearing lifetime.

A high radial load capacity with heavy-duty bearings is said to enhance reliability, and ground-finished gears are said to reduce vibration and noise.

Units up to 120 (35,000 Nm) have rigid monoblock housings; larger units have a horizontally split housing.

“The A series bevel helical gearboxes ordered by Karreman Quarries are part of a range with drives so compact and versatile that one unit can be used in applications traditionally requiring two gear units combined,” Lewis said.

The A series — in 12 sizes from 0.9-55 kW and 150 Nm – 14000 Nm torque — is said to achieve its versatility by having a ratio range up to 1700:1 in a single gearbox, with four reduction stages.

Key contact:

Malcolm Lewis

Bonfiglioli Transmission (Australia) Pty Ltd

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