The series product is suitable for crushing all kinds of ores and rocks, which has the feature of liable structure, high production efficiency, easy adjustment, use of economy. The spring safety system has been overload devised allowing foreign body such as iron pieces through crushing chamber without jeopardizing machines, use drying oil and water seal form, make rock flour and lubricating oil isolated so as to assure liable working. The type and size of crushing chamber depends on ores, standard type is suitable for medium reduction, medium and brachycephalic type for fine crushing.