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These two facts account for the superior performance of the standard gyratory-and the standard jaw crusher when fitted with non-choking liners. As compared with the straight-face concaves, the salient features of the non-choking variety are:
- They permit the use of smaller discharge settings in any given size of crusher.
- Capacities are considerably higher, particularly so in the range of finer settings.
- Wear of crushing head and concaves is more evenly distributed in the lower part of the crushing chamber.
- The receiving opening is reduced, the amount of this reduction depending upon the crusher setting, and upon the degree of curvature of the con cave faces.
- The ratio-of-reduction in the different sizes of standard crushers varies from about 6.75 to 9.5, averaging about 7.9 for the sizes mentioned previously. This is al so based upon the use of standard-throw eccentrics.
- The crusher product is more uniform, and will generally contain less fine material.
- Power requirements are very definitely in favor of the non-choking concaves.
It is obvious that this type of concave has some very desirable features. As a matter of fact, the development of scientifically designed, curved profile
crushing surfaces is probably the most important single improvement ever made in pressure-type crushers. The relative performance of non-choking concaves in the standard gyratory crushers is graphically illustrated in Table 1. This table contains a complete list of capacity ratings for Superior McCully crushers, from 8 to 42 in. inclusive, for straight-face, and non-choking, concaves. |
