By L.R. Stace, E.D. Yardley
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Additional resources for Belt Conveying of Minerals
1 Basic consideration of tensions Having determined the power required to move the conveyor and the belt speed, it is then possible to calculate the tensions in the belt. The magnitude of the tension is needed so that the correct type of belt can be selected for the duty. The power P transmitted to the belt by the drive pulley is given by P Te Xs where Te is the effective tension at the pulley, and s is the belt speed. 3 Plain drive. By definition Te T1 À T2 , where T1 is the carry side tension and T2 is the slack side tension (Fig.
J T Barclay Conveyor Belting Research. A monograph on the work carried out on conveyor belting at the Mining Research Establishment of the National Coal Board during the period 1950±1966, UK National Coal Board 78pp. ISO 5293:2004 `Conveyor belts ± Determination of minimum transition distance on three idler rollers'. 1 Introduction The perceptive reader will have noticed that in the previous chapter we have discussed idlers and pulleys and in particular have used quantities such as the mass of the moving parts of idlers and the spacing of top and bottom idlers in the calculations of powers and tensions.
The transition distance may be reduced if the pulley is raised relative to the centre idler because this reduces the edge stress, but should be lengthened if the pulley is lowered because this raises the stress in the belt edges. 3 also provides methods of calculation for transition distances based on similar geometric principles. However, it provides different formulae for textile and steel cord belts. Whereas ISO 5293:2004 makes no reference to any need for special measures with steel cord belts, DIN 22101 remarks that because these belts stretch so much less than textile belts particular care is needed over the accuracy of the calculation of transition distances.
Belt Conveying of Minerals by L.R. Stace, E.D. Yardley