CONVEYING
The new Double Belt design from thyssenkrupp
assured under all contact conditions. The Double Belt acts like a multiple ply fabric belt where the plies are locked together by layers of rubber. Frictional forces are transferred from the bottom cover to the reinforcement while lift forces are transferred from the top cover down to adjacent plies or, in the case of the Double Belt, to the adjacent steel cord belt. The benefit is longer conveyor lengths with lower individual belt tensions. The Double Belt effectively halves the belt tension of a traditional steel cord belt system.”
Unlike a multiple ply fabric belt that can bend around pulleys with outside plies elongating and inside plies compressing, steel cords must be in the same plane as they bend around the conveyor pulleys. So for the Double Belt application, the belts are parted and driven separately. The two belts are supported down the return side in a way that assures that the
individual take-ups effectively provide T2 tension for the drives. The belts are joined together on the carry side prior to material loading and remain paired until they reach the head end of the conveyor.
One of the major concerns with inclined conveyors is the potential of a catastrophic failure due to a splice pulling apart with one end crashing down the slope. The Double Belt provides a safety net in that the intact belt will support a broken belt and prevent the catastrophic result.
Although two individual steel cord belts are required, albeit at a lower tension rating than a single flight steel cord belt, the elimination or reduction of conveyor transfers and their excavations more than offset the added cost for the two belts. Furthermore, since one of the belts does not actually carry the material load, it can be supplied with a minimal top cover.“ The
Double Belt design provides mine operators with the ability to utilise longer conveyor flights and improve reliability by reducing the risk factors associated with conveyor transfers and large excavations.”
Lubrication strategies for mine conveyors
Some of the toughest maintenance challenges at mines and mineral processing facilities are presented by large belt- driven conveyor systems. These critical assets require gear oil for the gearbox, electric motor grease for the motor, and grease for multiple lubrication points – mostly for bearings. Improper lubrication and contamination can cause premature wear, or even worse, create unplanned downtime.
Lubrication Engineers( LE) told IM:“ Recurring challenges include dirt, water, heavy loads, vibration and extreme temperatures – and these are even more severe when the system is located outside. Some of the common lubrication challenges that maintenance teams face in trying to keep conveyors properly lubricated are multiple lube points, long walking distances, and the need to climb ladders and stairs. In addition, many lube points are in hard-to-reach places – creating safety concerns. All of this means compliance with OEM-recommended relubrication intervals is difficult to achieve.”
To combat these challenges, LE recommends a comprehensive lubrication program, consisting of
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