The cone crusher is applicable for crushing various rocks and ores with medium hardness. It is of reliable structure, high efficiency, convenient adjustment and economical operation. Its spring assurance system is overload protection device, which can keep the machine from damaging by sending the metallic material through crushing chamber. This overload protection device applies two sealed method: drying oil or water. It can separate lubricating oil and stone powder and ensure the reliable running of the machine. The crushing chamber is up to the application of ores. The standard one is applicable for middle crushing, the middle one is for fine crushing and the short-head one is for super fine crushing.