Strong Concrete Foundation for Crusher Support


	Strong Concrete Foundation for Crusher Support

To stand up under the extremely rugged work of reducing hard and tough rock and ore, and in doing so to maintain reasonably true alignment of its running parts, the crusher must necessarily be of massive and rigid proportions, rigidity being of equal importance to ultimate strength. Regardless of the tensile strength of the metal used in the main frame, top shell, and spider, these parts must be ""'1 made with walls and ribs thíck enough to provide this rigidity. Therefore it is practicable to use close-grained cast iron, and special high-test mixtures of cast iron, for these parts, if the machine is intended for crushing soft or medium materials. When very hard and tough materials are to be crushed, the machine is usual1y strengthened by substituting cast steel in one or more of its parts.

Sectional view of Superior McCully gyratory Crusher

Fig. 1: Sectional view of Superior McCully gyratory Crusher

Wearing parts in the gyratory crusher may be either chilled cast iron or manganese steel, depending on the character of the material to be crushed and the particular class of service for which the machine is intended. Stand¬ard crushers, in the smal1 and medium sizes, are customarily fitted with chill¬ed-iron head and con caves for crush¬ing soft and medium limestone and materials of similar hardness and abrasiveness, because its relatively low first cost and

exce\1ent wearing qualities make it the most economical material to use when the service is not too severe. Manganese steel, which combines extreme toughness with un¬surpassed wear-resistance, is the uni¬versal choice for crushing hard, tough rock regardless of the class of service or type of crusher. Even though the rock be quite soft and non-abrasive, it is general practice to use man¬ganese steel concaves in the larger sizes of primary crushers because of the shock s attendant upon handling ¬large and heavy pieces of rock.

Prospecting & Mining Basics