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The Newhouse crusher was one of the early developments in the high-speed class of fine-reduction crusher. This machine, a sectional view of which is shown in Fig. 7, incorporates several unusual features, at least one of which is unique in crusher design. The eccentric is direct-driven by a vertical motor mounted above the spider, the drive shaft running down through the hollow-bored mainshaft. Speeds range from 480 to 580 r.p.m, depending upon the size of the crusher, and upon the frequency of the electric current. Eccentric throws, as compared with those of the crushers we have been dealing with, are relatively low. This combination of small throw and high speed results in a very uniform product with a minimum amount of fines for any setting and ratio of reduction. A unique feature is suspension by means of cables, eliminating the usual foundation, although the crusher can be set on a foundation where required.
This crusher is usually furnished with full-curve, non-choking concaves, which are reversible in the top shell. These concaves are of the same general contour as those shown in the diagram of the Superior McCully reduction crusher chamber, (Fig. 6) and in general the crushing chamber is similar, except that the chamber in the Newhouse crusher is somewhat deeper and, consequently, the head does not have as pronounced a flare. The important difference in the crushing action of these two machines lies in the difference in eccentric speed. That of the Newhouse crusher is so high that no material can drop through the almost parallel zone just above the discharge point without being caught between head and concaves and broken to a maximum one-way size closely approximating the close-side setting.
This crusher can be set somewhat closer than comparable sizes of the reduction crusher previously described. Although it cannot be classed as a
fine-crusher it does belong to the fine-reduction class. Furthermore, by virtue of its large receiving openings, it rates as a machine for secondary reduction work. When so used it is usually fitted with con caves of the non-reversible, non-choking type , which are designed to make use of the full rated receiving opening of the crusher, although they sacrifice the feature of reversibility which permits wearing both ends of the con caves. |
