During the working process, the eccentric shaft will force the motor to make a swing movement at a fixed point by the conveyor, counter shaft, couplings, and the cone parts, which can make the crushing cavity close or leave the rolling shirakable now and then.And the ores will be crushed by shock, crack and warp.And HPC cone crushers spring secure system is a kind of overloaded protection equipment, which can let the non-metal materials pass the crushing cavity with no harm to the machine.Adoption of the glycerol or water seal forms can seprate the stone powder and lubricating oil, which ensure the reliable work.The spring secure system will take effects and the discharge opening will become largest so that the foreign bodies can be discharged from the discharge opening when the non-crushed materials can not pass the crushing cavity or the overloaded phenomenon has happened on the machine.If the foreign bodies get stuck in the cavity, we can continue to increase the discharge opening and let them pass the cavity.Due to the spring, the discharge opening wil recover and go back to the normal work.