the cone crusher is a common used crusher whose motor rotate through the pulley or coupling, transmission shaft and the cone parts cranking motion rolling a shaft whiling it is running.This can make cone crusher wall is sometime close to or far from the white wall of rolling surface on the adjusting sleeve.Ores are ceaselessly impacted, extrusion and bended in crushing cavity.Then the ores are breaking by the striking.When some strong stone pass the crushing cavity or crushing machines are overload for some reasons, the spring insurance system start to run, and make the ore mouth magnify.Sometimes the object discharge from the crushing cavity which is locked in clean cavity system, the discharge size will continue to increase, then make out the object from crushing cavity last.Under the effect of the spring, the discharging size reset automatically and the machines will resume normal work. Negotiable