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Fig. 1 shows a sectional elevation of the A-e single-roll crusher, known as the Fairmount crusher. Fig. 2 shows a cutaway view of the machine, with hopper and part of the near side frame removed to show the crushing chamber.
The moving elements of the machine consist of the roll, with its supporting shaft and driving gear, and the pinion-shaft on which are mounted the pinion and driving pulley. The fixed member of the crushing chamber, known as the anvil, is supported near its upper end by a heavy cross-shaft; the lower end is held in position by a transverse equalizer beam (anvil beam), to each end of
which is attached a pair of heavy tie-rods. These rods, at their upper ends, pass through two nests of strong springs, which serve the double purpose of shock absorption and equalization of tension on the rods. The anvil is positioned at its lower end by shims, placed between the ends of the anvil beam and the side frames. The entire mechanism is supported by the pair of heavy and rigid side frames, which are tied together by stiff cross-members at each end.
The curved crushing surface of the anvil is lined with chilled-iron or manganese-steel concaves, which are cast with corrugated faces. These corrugations sometimes extend the full length of the surface, but when affine product is desired the lower concave segments are made with a flat surface at the discharge point.
The roll-center is made of cast steel, and the teeth are of manganese steel inserted in cored pockets in the surface of the roll-center. These teeth, it will be noted, are of different heights, the higher teeth being known as "slugger teeth," and the lower ones as "regular teeth."
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