Conveying
Twiflex knows when W
Twiflex’s disc brakes meet the needs of overland coal conveyors
hen coal processing plants are an appreciable distance from the mine, how best to transport the
coal from one to the other is a key consid- eration. It is not unusual for the processing plant to be tens of miles away, which might at first glance suggest delivery by truck. But
overland conveyors can often provide a far more economical solution, providing cost reductions in the order of 20-40% or more. Transporting vast tonnages of coal overland,
particularly where there are inclines involved, requires the highest levels of expertise in sophisticated conveyor and control systems. One of the most important design con-
siderations is the braking technology to be employed. With over 35 years’ experience in conveyor braking control, Twiflex, one of the premiere brands of Altra Industrial Mo- tion, has become the first choice to provide reliable control for demand- ing materials handling
applications. Disc brakes meet the
requirements of overland coal convey- ors in several areas. As well as be- ing the ideal technology for normal stopping
and parking operations, they also provide vital emergency stop operation. They are the ideal choice where one conveyor feeds another and there is a risk of spill – for example where the conveyor from a crusher at the mine feeds the overland conveyor to the processing plant. In normal operation, depending on the installation the disc brakes may only be used during the final stages of brak- ing, when they are applied to lock the conveyor in its parked position. In other applications, they may be needed to provide general slowing and stopping duties. Most importantly, in the event of a power failure, the brakes will be required to stop and hold a fully loaded belt. Twiflex specialises in ‘Power Off’ braking systems. To operate the brakes, power- ful springs apply force to compress the brake pads against the disc. To release the brakes the springs are compressed by a retraction device, which in over- land conveyor applications will typically be hydraulically actuated. Any failure in the supply to the retraction device would cause the springs to be released, so providing ‘Power Off’ braking.
>>>> 22 June 2012 Solids and Bulk Handling
www.solidsandbulk.co.uk
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