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Progress in Roll Crushing. BY C. Q. Payne, New York, N. Y. On the right, a Roll Crushers is shown in a sectional elevation of the A C single roll crusher while here below is 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.Application of Hongxing Hammer Crusher. Hammer crusher is used for crushing all kinds of medium hardness and weak abrasiveness materials whose compressive strength less than 100 Mpa and water content less than 15 , such as coal, salt, chalk, plaster, brick, limestone, etc. In addition, the hammer breaker not only can be used in crushing production line and sand making production line, also can.