Modern Mining March 2021

system arrives in SA

Suspension The Belaz-75311 is fitted with conventional suspen- sion for both front and rear wheels, featuring two pneumohydraulic (nitrogen and oil) cylinders with in-built hydraulic dampers on each axle. Cylinder piston stroke is 320 mm and 290 mm in the front and rear, respectively. An integrated shock absorber provides shock absorption, lateral roll stability, and frame durability. Standard equipment Standard features on the Belaz-75311 include a remote-controlled fire-suppression system; video surveillance; automatic centralised lubrication; tele- metering for tire inflation control; a loading and fuel control system, and a heater and conditioner unit, among others. 

to Venchyk, the noise level inside the cab does not exceed 85 dB and the cab is ROPS compliant. The Belaz-75311 features an ISO 5010 compliant hydrostatic steering system, with the front wheels steerable to a rotation angle of 39°. It has a turn- ing radius of 15 m and an overall turning diameter of 34 m. “The cab’s large window area also provides an excellent view of the road, making for better han- dling of the truck,” says Venchyk. Braking The braking system complies with the safety require- ments of ISO 3450 and comprises service, parking, auxiliary and emergency brakes. “The service brakes on the front and rear wheels are dry disk brakes with automatic clearance adjust- ment. The disks are mounted on the shafts of traction electric motors,” says Venchyk. The parking brake system on the rear wheels comprises constantly-closed brake gears with spring actuation and hydraulic control, while the auxiliary brakes feature electrodynamic braking with traction electric motors in alternator mode, and forced air- cooling for the brake resistors. Hydraulics The truck features a combined hydraulic system for body hoist and steering, as well as for the brake sys- tem. The body hoist cylinders are telescopic, with three stages and one double-action stage. Also fea- tured is a double-section, axial-piston, variable-flow oil pump.

The Belaz-75311 dump truck is ideal for transporting run of mine material at open-pit mines.

Key takeaways  The Belaz-75311 from Mynbou Rigs Afrika is ideal for the transportation of rock mass in complex technical conditions  The dump truck features a Tier 1 four-cycle 1 864 kW MTU diesel engine with a V-type cylinder arrangement  Air filtration is done through a three-stage filter with dry-type elements, and exhaust gas is evacuated via the body structure  The General Electric AC electromechanical transmission allows for effective start after loading with an excavator, optimal traction on the road slopes of quarries, low operating costs and excellent compatibility with harsh environments.  The service brakes on the front and rear wheels are dry disk brakes with automatic clearance adjustment

March 2021  MODERN MINING  31