By L.R. Stace, E.D. Yardley
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ISO 251:2003 Conveyor belts with textile carcass ± Widths and lengths. Streets H Sutcliffe's Manual of Belt Conveying W & R Chambers Ltd 1956. Ketelaar J P I and Davidson P J `Improving the efficiency of conveyors used for the transport of minerals in underground and surface mines' Mining Technology Vol. 77 No. 883 March 1995. Fenner-Dunlop Technical Manual Fenner-Dunlop Conveyor Belting Europe Limited, Hull UK. Kirk A `Drive configuration effects on conveyor belts' Proceedings of Beltcon 8 Conveying of materials and problems encountered October 1998 Johannesburg.
7) and the two geared tandems (Fig. 8). For these forms of drive the same principles for calculating the tensions as are illustrated above apply. It should be noted, however, that the limiting slip condition can occur at any of the drive drums and it is therefore necessary to check each case. The consequences of belt slip can be severe and even include the generation of fires (see Chapter 8). It is therefore usual to err on the side of caution and to assume conservatively low values of friction coefficient, to use lagging on the drive drums to increase the friction coefficient or to increase the angle of wrap to above the minimum required.
The spacing of the idlers needs to be appropriate to the duty, having regard to the required bearing life. This life is the L10 fatigue life, which is defined as the life that 90% of bearings of a given type under given operating conditions are expected to exceed. This life can be calculated from a knowledge of the bearing's rated capacity (given in manufacturers' data) and the load on the bearing. For the bearing life calculations it is generally assumed that Design of belt conveyors 2 ± hardware 49 two-thirds of the load on the carrying idlers is borne by the centre idler.