This series of crushers is suitable for crushing various ores and rocks with medium to high hardness. It has the characteristics of reliable structure, high production efficiency, easy adjustment, and economical use. The spring safety system is an overload protection device that allows foreign iron blocks to pass through the crushing chamber without harming the machine. It adopts two sealing forms, dry oil or water, to isolate the stone powder from the lubricating oil and ensure reliable operation. The type of crushing chamber is determined by the purpose of the ore, and the standard type (PYB) is suitable for medium crushing; Medium and short head types are suitable for fine crushing.