machInery & machIne safety
InnovatIve plannIng method for curved overland conveyors
one of the pioneers in this industry. nothing has fundamentally changed in the functional principles of this technology since then - except for the feasible limits: With highly developed core components, precise calculation methods and own planning tools, the system provider continues to push the limits of what is technically feasible - while drastically reducing the time and costs involved both in the planning phase and in the handling of projects. "our belt conveyors are able to solve complex
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problems with regard to the transport of any bulk material whether in the mining or cement industry," says christoph dorra, regional sales manager south america, conveying and loading systems, at Beumer group. "While the basic task to transport bulk material from the material feed up to the final discharge point seems to be comparable, on closer inspection no system is similar to the other. the spectrum of potential conveyed materials alone requires individual consideration of the components to be used with regard to wear resistance or the maximum permissible gradients of a conveyor." In addition, the mass flow to be conveyed and the height to be overcome are the main factors determining the dimensioning of the drive unit of an overland conveyor. "a further challenge is posed by systems at high altitudes," says dorra. at altitudes exceeding 4,000 metres, as it is often the case in the south american andes, for example, it must be considered that the air pressure and thus the density of the air decreases with increasing altitude. this reduces both the cooling effect and the insulating capacity of the air. as a consequence, the drive units like frequency
ince the late 1960s, Beumer group has been developing and producing curved overland conveyors, making the company
converters and electric motors do not achieve the specified rated power that applies for installation heights up to maximum 1,000 metres above mean sea level. this is the so-called derating factor. In addition to the pure material specification
and the mass to be conveyed over a certain height, the topography along the conveying route is of particular importance in the project planning.
The biggesT challenge: The Topography
"In 2009, we implemented an overland conveyor in china that is able to curve on 85 percent of the 12.5 km long conveyor line between the quarry and the cement plant. the system literally winds its way to the destination, without any transfer point," reports dorra. potential obstacles appeared in the form of residential areas, roads and rivers that had to be
crossed, larger bodies of water or mountains that could not be crossed. "not everyone would automatically think of an overland conveyor as the optimal solution when faced with these challenges," says dorra. "But for us, these projects are a special attraction. our target is to have as few transfer points as possible along the entire conveyor line.” this reduces both wear and tear and the environmental impact of dust, for example, but also increases the availability of the overall system and significantly improves ease of maintenance.
Four sTraighT conveyors are converTed To one beuMer overland conveyor
a good example for such challenges is represented by the project of an american coal mine. here, a Beumer overland conveyor with a
42 novemBer 2021 | factory&handlIngsolutIons
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