Engineering & Mining Journal

OCT 2017

Engineering and Mining Journal - Whether the market is copper, gold, nickel, iron ore, lead/zinc, PGM, diamonds or other commodities, E&MJ takes the lead in projecting trends, following development and reporting on the most efficient operating pr

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CONVEYORS OCTOBER 2017 • E&MJ; 63 www.e-mj.com to the operational advantages, the company noted that the new series of couplings also offers attractive procurement and operating costs. Voith offers a version with bearings on both sides for stand-alone use as well as a variant with bearings on the output side for direct motor connection. Power transmission via the TurboBelt 500 TPXL is wear-free and does not re- quire a mechanical connection. New vanes with the XL profile double the power density of the coupling in comparison to conventional coupling types. This means that only half the volume is required to transmit the same force. The hydrodynam- ic circuit of the coupling limits the torque in the driveline to a fixed, defined value, which protects the belt and the drive com- ponents from damage due to overloading. This minimizes maintenance costs and increases the lifetime of the system. Mo- tors can be run up to speed under no-load conditions and staggered in time using the fill control system. This minimizes the current peaks that always occur when mo- tors are switched on and reduces the load placed on the power grid. The Roller Derby ASGCO has added Semi-Ceramic Pulley Lagging to its product portfolio, enabling it to offer customers a choice between full ceramic coverage with its Arrowhead Ceramic Pulley Lagging for high tension drive pulleys, as well as partial (40% cov- erage) ceramic lagging for smaller pul- leys, non-drive pulley's and bend pulleys. According to the company, Semi-Ce- ramic Pulley Lagging provides a solution when conventional rubber lagging fails to correct belt spillage and wears prematurely. The aluminum oxide ceramic tiles are em- bedded in rubber on all sides and separat- ed by a horizontal groove to channel away water and dirt. Among the more important features of the product, said ASGCO, are its pre-chemical backing that provides an exceptional bond for rubber-to-metal appli- cations; improved ceramic tile that provides robust performance in dry, wet or muddy applications; superior bonding strength due to 3-mm of the neoprene compound vulca- nized into the bottom-side of the lagging; and rounded corners to allow for better ad- hesion between the rubber and the tile. The HXF-40 and SDX-2200 idler roll- er lines from (Joy) are super-duty systems that surpass CEMA F and E idler load standards, respectively. The HXF-40 series incorporates a 40-mm spherical roller bearing, and is specifical- ly designed for high-tonnage mining and industrial applications. Bearing protection features include: • A patented, engineered shaft that re- duces overall roll weight and increases performance; • Patented retaining sleeve creates a smooth contact surface for the rotating lip seal; • Back seal that allows for a large grease reservoir; • Flinger to employ natural centrifugal forces generated by a rotating idler roll, redirecting potential contaminants away from the bearing cavity; • Triple labyrinth seal to retard lateral movement and provide a barrier to con- taminants reaching the bearing; • Counter-bored shell with protected weld contributes to proper bearing alignment; and • Lip seal to provide added protection for the bearing. The SDX-2200 is a super-duty idler meeting the requirements for CEMA E applications up to 2,200-lb load rating. According to the company, its combina- tion labyrinth and contact seal has been proven in the field to be superior to car- tridge-type or conventional labyrinth seals used in other heavy-duty idlers. The SDX-2200 idlers offer up to a 2-in. engineered shaft for additional load capaci- ty, along with an adjusting nut that provides additional protection to the seal area and establishes a precise bearing adjustment; a positive hold down that includes drop-in rolls that are factory assembled and positive- ly secured; an external labyrinth seal featur- ing a unique roll head and nut combination to produce an extremely long path, close tolerance labyrinth seal; and interchange- able rolls (wing and center), either sealed or regreaseable, that are interchangeable. Metso's Energy Saving Idler (ESI) sys- tem, according to the company, can pro- vide reductions of up to 35% in power con- sumption of long distance belts, besides increasing the service life of the equip- ment. The ESI design replaces the con- ventional central roller with a pair of lighter idlers mounted on a pivoted rocker arm, decreasing the spacing on the belt and the pressure on the central roller, which nor- mally receives 70% of the total load. With this new configuration, the load applied on each roller, as well as the contact pressure with the belt, is reduced by 50%. In addition, the company said custom- ers can gradually replace the central roller on existing belt systems with the ESI rock- er arm and lighter idlers. ESI can be in- troduced sequentially during maintenance shutdowns. The pivoted rocker arm bracket is supplied with the same attachment con- figurations of the conventional roller and it Voith's new compact TurboBelt 500 TPXL drive needs only half the volume of conventional drives to provide equal power to the conveyor. Metso says its Energy Saving Idler system reduces the load typically carried by conventional roller systems by 50%, in addition to cutting belt power consumption by up to 35%. ASGCO's new Semi-Ceramic Pulley Lagging expands its product line to offer full or partial lagging solutions for most applications.

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