MTA-AUS 2014

CONEXPO-CON/AGG VIP SHOW GUIDE contains Floor Plans and a complete listing of companies exhibiting at the ConExpo-Con/Agg 2014 trade show in Las Vegas March 3-7, 2014. It also contains 2014 forecasts for the Aggregate, Concrete and Cement industries

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2014 VDMA MINING SUPPLEMENT | VDMA 63 VDMA as well as larger curve radii, and enclosed pipe conveyors for products, which need to be protected against the effects of the environment. At the port of Callao in Peru, Beumer will be installing pipe con- veyors with a length of around 3 km for transporting copper, lead and zinc concentrates for completion in 2014. "Depending on the landscape and environmental conditions, we can install overland con veyors with horizontal curves with lengths of up to 20 km," said Oberheuser. Gradients of up to 15° can be realized depending on the characteristics of the materials to be conveyed. After planning, installation and commissioning, maintenance and service are no more laborious than with a straight conveyor. On average, the annual maintenance costs are only around 2% of the investment sum. In Canada, Beum er is currently installing a conveyor with a length of 3.48 km for a large mining operation. This will convey up to 6,000 metric tons (mt) of iron ore per hour. This large-area conveyor system must withstand extreme temperatures of down to -40° and heavy snow- falls. Beumer has designed all mechanical and structural elements for the extremely low temperatures. For example, the system is fitted with a fe ed conveyor and an unloading system with tripper car. As the main contractor, Beumer has equipped a new distribution center off the shore of Malaysia with 17 trough belt conveyors with a total length of 12 km for a large iron ore exporter. The conveyors ensure swift transport of iron ore from super-size freighters to the mainland. Beumer delivered and installed the conveyors, put them into operation an d took full charge of engineering, all according to a strict timetable. Chinese Select Fluid Couplings for a Large Conveyor Drive When high reliability and power are needed, the Xishan Jinxing Energy Co. Ltd. relies on Voith fluid couplings. A total of three are used under- ground in the 4.8-megawatt (MW) drive for the main belt conveyor at the Xiegou No. 12 coal mine in Shanxi Province, China. Three 1,600-kW (1,900 hp) drives power the 1,900-m (6,200-ft) long main inclined belt conveyor. This conveyor transports 3,800 metric tons per hour (mt/h) of coal. Powerful and reliable couplings were re- quired and, for the mine operator, the fill-controlled 866 TPKL fluid cou- pling from Voith is the best solution on the market. Through controlled application of torque, the fluid coupling pre- tensions th e belt slowly and permits smooth conveyor start-up. This controlled soft start protects the belt and driveline components and extends their lifetime. As a result, the Voith fluid coupling reduces unplanned downtime—the operator benefits from lower mainte- nance costs and continuous production. Regardless of the load state of the belt, start-up times of up to three minutes are possible. Thanks to stand b y cooling of the operating oil, the 866 TPKL fluid coupling also permits multiple conveyor start-ups in succession, even when the belt is loaded. The mine operator is very satisfied with the performance of the 866 TPKL, according to Voith. In contrast to other solutions, the compact fluid coupling can withstand extreme environmental conditions such as dust, dirt, moisture, heat or cold. As in every h ydrodynamic coupling, power transmission in the 866 TPKL is virtually wear-free. For the operator, this translates into lower maintenance and repair costs for the coupling. In addition, motors start up independent of the machine load, and through sequenced starting of the motors, the fluid coupling reduces the load on the power supply circuit. An additional benefit of the 866 TPKL is its ability to op erate with reduced filling to drive an empty conveyor at a reduced speed. During the creep speed operation, less power is transmitted and the belt runs more slowly. This function is useful for the visual inspection of the belt and splices. In the Xiegou No. 12 coal mine, the fluid couplings were operated in the partially filled mode during commissioning to be sure that the belt was tracking properly. Wi th the fluid couplings operating in the partially filled mode, the belt speed could be reduced to 1.2-1.7 meters per second (m/s) instead of operating at the rated speed of 4.5 m/s. Until now, the coal mine has been operating at the initially planned production capacity of 15 million mt/y. The operator plans to increase production capacity in the next one to two years. This will require the main belt co nveyor to be upgraded with a fourth drive. For this, the op- erator plans on installing an additional 866 TPKL fluid coupling. The Voith 866 TPKL fluid coupling (pictures here in China) permits smooth conveyor start ups.

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