Conveyors belt selection

Magnetic pulleys are available ia diameters from 152 to 1524 mm and ia widths that match the conveyor belt width. The material burden on the belt, belt speed, and type of tramp iron expected to be encountered are all considerations ia magnetic pulley selections. 

Selection. The magnetic pulley width should match that of the belt. The face width is normally 51 mm wider than the belt width up to 1067 mm wide, and 76 mm on widths ia excess of 1219 mm. The speed of operation of the conveyor belt should be determined by calculating the maximum capacity to be handled. Using this iaformation, the diameter of the pulley required to handle the capacity can be determined (Table 2). The operating belt speed must be acceptable for the diameter selected. If the recommended belt speed is exceeded, the pulley diameter that can handle the belt speed must be used. 

Magnetic pulleys. These vary in size from 0.203 to 1.219 m in diameter and from 2.03 to 1.526 m in width. The acceptable depth of the material on the conveyor belt depends on the diameter of the pulley and the linear velocity of the belt (see Table 19-18). Table 19-19 indicates the maximum capacity for such units. Depending on the apphcation, the correction factors given in Table 19-20 should be apphed. For sizing and maximum efficiency, multiply the actual volume of material to be handled by the correction factor shown and select the magnetic pulley having a capacity equal to or greater than the resultant volume. 

Robbins JA (1988) A model for particle-selective transport of tracers in sediments with conveyor-belt deposit feeders. Journal of Geophysical Research 91 8542-8558 Robinson LF, Belshaw NS, Henderson GM (in press) U and Th isotopes in seawater and modem carbonates from the Bahamas. Geochim Cosmochim Acta Rosenthal Y, Boyle EA, Labeyrie L, Oppo D (1995a) Glacial enrichments of authigenic Cd and U in subantarctic sediments A climatic control on the elements oceanic budget Paleoceanography 10(3) 395-413... 

Robbins, J. A., A model for particle-selective transport of tracers in sediments with conveyor belt deposit feeders , J. Geophys. Res., 91, 8542-8558 (1986). 

Transportation (by belt, rail, or truck) can initiate (due to movement of the coal) processes that result in size and density segregation. Thus, variations from one side of a conveyor belt to the other, from side-to-side, end-to-end, and top-to-bottom locations in individual cars or trucks, and between one location and another in a coal pile, must be anticipated (ASTM D-346 ASTM D-2234 ASTM D-4182 ASTM D-4702 ASTM D-4915 ASTM D-4916 ASTM D-6315 ASTM D-6518 ASTM D-6543 ISO 1988). Therefore, the challenge in sampling coal from a source or shipment is to collect a relatively small portion of the coal that accurately represents the composition of the coal. This requires that sample increments be collected such that no piece, regardless of position (or size) relative to the sampling position and implement, is collected or rejected selectively. Thus, the coal sample must be representative of the composition of the whole coal (i.e., coal in a pile or coal in a railcar or truck) as represented by the properties or quality of the sample. 

In traditional lime processing plants serving shaft kilns, the screened ROK lime then passed along a picking conveyor belt, where partially calcined lumps (sometimes called bullheads ) are removed, together with selected grades of lime. However, economic and social pressures have resulted in the phasing out of this activity in many countries. 

The FPl values have been determined in the ASTM E2058 in the co-flowing air having a 40% oxygen concentration for polymers, electrical cables, and conveyor belts [21, 22, 40, 41, 80-86]. The FPl values for selected polymers, taken from Refs. [21, 22, 40, 41, 81-83], are listed in Tables 11.25 and 11.26. Correlation... 

Other systems for vulcanizing polychloroprenes are in use they include the use of the metal oxides alone, and the use of thiourea derivatives. In the production of the Selby conveyor belt the sulphur system was selected in preference to thiourea because it offered greater processing safety before the vulcanizing stage. 

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