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So far, all of the crushers we have been discussing have been of the "low-speed" class; that is, with eccentric speeds ranging between the approximate limits of 100-200 r.p.m. It is customary, as before mentioned, to rate such crushers at their open-side discharge settings, because there is a definite relationship between these values. Most modern crushers, designed for what may properly be classed as fine-reduction crushing, are of the high-speed type. The eccentric speeds and shape of the crushing chamber in the machines of this type are such that the maximum one-way dimension of the product particles is established by the close-side discharge setting; consequently it has become customary to rate these crushers at this setting. |
