Cone crusher is suitable for crushing various kinds of ores and rocks of medium or above medium hardness. Cone crushers have many features like stable structure, high efficiency, easy adjustment, low operating cost and etc. The spring safety system works as an overloading protection system which allows metals to pass through the crushing chamber so as not to damage cone crusher. The safety system adopts dry oil and water as two kinds of sealed formation to make plaster powder and engine oil separated to ensure reliable performance. The crushing chambers are depending upon the feeding size and the fineness of final products. The standard type(PYB) is applied to medium crushing; the medium type is applied to medium or fine crushing; and short head type is applied to fine crushing.