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At first glance, the most striking difference lies in the depth of the crushing chambers, due partly to the non-choke design, and partly to the decreased crushing angle. This diagram was laid out for the same jaw-motion as the standard-crusher diagram, and it will be noted that about the same number of strokes are required to move the material down from receiving-opening to discharge opening. However, it will also be noted that the areas between successive lines are substantially greater, which is a direct indication of the relative theoretical capacities of the two crushers. In addition to this theoretical difference, there is an "imponderable" asset which accrues to the decreased crushing angle-an asset which is not subject to pre-calculation, but which contributes in no small degree to the excellent performance of the new machine, not only in increased capacity, but in reduced rate of wear on the jaw plates.
Ratings of the developed sizes of the new crusher are given in a table.
Naturally, it costs money to build such characteristics into a crusher, and, for that reason, it is hardly to be expected that this improved design will entirely
supersede existing standard models of the Blake crusher. In very many applications, receiving opening, rather than optimum capacity, is the predominant factor. For such applications-especially for those involving soft, or medium-hard material-the lower-cost standard crusher will probably continue in favor. |
