Cone crusher is suitable for crushing of various kinds of medium or above hardness ores and rocks, has stable structure, high efficiency, easy adjustment, and economy features. The spring safety system of crusher acts as an overloading protection system that allows metals to pass through the crushing chamber so as not to damage the cone crusher. The safety system uses dry oil and water as two kinds of sealed formation to make plaster powder and engine oil separate and to make sure reliable performance. The type of crushing chamber depends upon the size of feeding and fineness of the crushed product. The standard type (PYB) is applied to medium crushing while medium type is to medium or fine crushing and short head type is fine crushing.