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Extra resources for Belt Conveying of Minerals
5 also advises that higher speeds result in higher wear rates of moving components and the possibility of greater dust make at transfer points. 3 Belt capacity The belt capacity is derived by simple geometry from a diagram such as Fig. 2, in which there are three rollers of equal length, although formulae are available for other geometries such as five-idler sets and two-idler sets. All calculation methods assume that the belt is filled uniformly along its length and that the load extends to within a small distance x of the edge of the belt.
There may be one or more motors mounted on the main drive pulley. 4 Dual-drum geared tandem drive. 25 and angle of wrap of 230ë gives T1 1X1565XTe . e. not geared, the dual-pulley dual-motor drive (Fig. 5). With natural load sharing the distribution of tensions and loads between the two pulleys would be as for the dual-pulley geared tandem drive above and it can be shown that one motor would take approximately 70% of the total load. 14 pointed out, this requirement for motors of different sizes would be inconvenient in practice and in fact was not followed in the coal mining industry.
The equation for the effective tension in the belt has three terms: 1. an energy term 2. a term relating to the main resistances 3. a term relating to point resistances. 28 Belt conveying of minerals The first of these accounts for: · the change in belt tension to lift or lower the material and belt · the tension added in accelerating material to belt speed. The second includes changes in tension due to: · · · · · · · · the belt sliding on chute skirtboard seals idler seal friction idler load friction visco-elastic deformation of belt idler misalignment drag due to slider beds bulk materials sliding on skirtboards bulk materials moving between the idlers.