HEALTH & SAFETY
BREAKING CONVENTION
Dellner Bubenzer’s recent work for a large mining company in Mongolia helps demonstrate the importance of brake technology
A Mongolia-based copper mine M
ining puts considerable demand on its equipment, not least the disc and drum brakes used for pulley
systems, cranes and other severe duty applications. The equipment must be able to weather heat, contaminants, vibration, heavy load and extreme production demands while maintaining ‘always on’ operations. The equipment must therefore
be outstandingly durable as well as safety critical. Provider of disc and drum brake
equipment Dellner Bubenzer is currently providing such safety critical equipment to companies operating in Mongolia, north of China, one of a number of mining hotbeds in the region. The company recently supplied
brakes for three gearless conveyor systems with an installed capacity of 2 x 5,500 kW each for 7100 t/h for a copper mine in the region.
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Right: A Dellner Bubenzer brake stand The full scope of work included
fl oating calliper brakes (model SFR50), brake discs, hydraulic power units, UPS, BCC3000 closed loop control systems, and complete encoder technology.
BRAKING SYSTEMS IN MINING There are a variety of braking systems used by mine operators. These include hydraulic brakes commonly used in mining trucks and other heavy equipment. They rely on hydraulic pressure to actuate the system, off ering good stopping power and control. Hydraulic systems can be enclosed and run in oil, protecting them from the corrosive elements of a mine. Secondly, there are wet multi-disc brakes, These are immersed in oil to prevent overheating and brake fade, making them ideal for heavy machinery like mining trucks. Electric brakes are also widely used, and these off er a smooth, wear-
free braking experience. Dellner’s product comprises disc brakes which off er precise control and good heat dissipation and fi nally drum brakes which are less common in modern mining equipment but still used in severe duty applications.
HOW DOES THE BRAKE SYSTEM WORK? The main parameters of the brake system including pad wear, stroke (air gap), and brake pad temperature are now continuously monitored. The brakes stop the conveyor
within ten seconds in loaded or unloaded condition. Depending on load, speed, etc., the HPU and control unit provide different braking levels and scenarios. The controlled braking process minimises the conveyor belt tension and reduces stress in the connected equipment. The system is also able to perform the pre-programmed
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