. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. ROLLS Fig. 158.—Arrangement of Dry Crushing Rolls. rolls until it is all ^-in. mesh and finer, and this 8-mesh product goesthe rounds of the finishing screens and finishing rolls until it will all passthe final mesh. Observe, also, that any 8-mesh or finer product thathas been produced by the roughing rolls does not get to the mediumrolls, and that any finished sands that may be in the 8-mesh productis not burdened upon the finishing rolls, but goes to the finishing screensfirs
. Machinery for metalliferous mines : a practical treatise for mining engineers, metallurgists and managers of mines. ROLLS Fig. 158.—Arrangement of Dry Crushing Rolls. rolls until it is all ^-in. mesh and finer, and this 8-mesh product goesthe rounds of the finishing screens and finishing rolls until it will all passthe final mesh. Observe, also, that any 8-mesh or finer product thathas been produced by the roughing rolls does not get to the mediumrolls, and that any finished sands that may be in the 8-mesh productis not burdened upon the finishing rolls, but goes to the finishing screensfirst. Thus immediately a particle is broken to a finished condition, it. 248 MACHINERY FOR METALLIFEROUS MINES. passes directly to a finished product bin without again passing throughthe crushing machinery. The mesh of screens used and the opening allowed between therolls are modified to suit the particular case in hand, in order to properlydistribute the load upon the different machines. The finishing rollsare always run with their edges in contact except when the shells areentirely new. The capacity of the combination described when reducing to 30-meshmay approximate from 125 to 175 tons per 24 hours; 20-mesh, 200to 250 tons per 24 hours ; 16 mesh, 250 tons and upwards. The speed at which it is desirable to run these rolls is 50 to 75revolutions per minute for the 36-in. rolls and 75 to 125 revolutionsfor the 26-in. as at these speeds they give the best results. The general appearance of a Gates high grade crushing roll isshown in fig 159. The main frame is cored and braced in a substantialmanner with a view not only of meeting the requirements of stress
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1902
