MATERIALS HANDLING
CONVEYING S
OVERLAND
Danny Slonka reports on conveyor belts and the solutions to make them durable enough for mining applications
teel cord conveyor belts were introduced almost 70 years ago and since then have become the most economical and most
environmentally friendly means of transporting bulk material over longer distances. Today, 100km-long multiple flight systems are in operation as well as almost 30km-long single flight systems. Belt breaking strengths up to 10,000N/ mm are available. Tere are almost no limits if someone needs to haul bulk material from point A to point B. Tis article describes the most
important criteria for the design of overland conveyor belts. By applying those criteria, the overland conveyor system will be even more economical. Te most important criteria are the dynamic splice efficiency, taking the splice design and calculation as per DIN 22101 into consideration, and the use of energy- optimised conveyor belt bottom covers.
Increasingly longer conveyor systems and extreme environmental conditions mean that conveyor belt reliability is becoming extremely important
ENERGY-OPTIMISED CONVEYOR BELTS Conveyor belts are used for multiple purposes, having high efficiency and reliability. Tey provide one of the most economical forms of bulk material transport. Companies are placing a stronger emphasis on sustainability as well as environmental and climate protection. Energy consumption is becoming a more important factor in conveyor applications. Longer conveyors and higher production demands are driving engineers to seek new alternatives to reduce energy demand. Minimising the belts’ deformation while in contact with conveyor components such as idlers has become a high priority. On long-distance systems the belt is
running over a huge number of idlers resulting in deformation of the belt covers. Te so-called indentation rolling resistance (IRR) is the predominant part of the
main resistances and can represent up to 60% of the total energy consumption. Consequently, the IRR offers the most significant savings potential and has been a major focus in the past decade. Due to a continuous development of the chemical composition of the rubber compound the IRR could be improved considerably. With the latest generation of energy-optimised conveyor belts it is possible to reduce the energy consumption
Indentation rolling resistance (IRR) can comprise up to 60% of the total energy consumption
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