In the process of crushing ore by the jaw crusher, the materials added to the crushing cavity of the jaw crusher (the cavity composed of the fixed jaw plate and the movable jaw plate), due to the periodic reciprocating swing of the movable jaw plate, when the movable jaw plate When approaching the fixed jaw, the material is crushed, split and bent and broken. When the movable jaw plate leaves the fixed jaw plate, the crushed material smaller than the size of the discharge opening will be discharged from the lower discharge four by its own weight. The material located in the upper part of the crushing chamber has not been crushed to a small enough size, and then falls to the lower part of the crushing chamber, and continues to be crushed by the action of the jaw plate again.

When a large piece of material is crushed in the jaw crusher, the movable jaw plate is stretched to the maximum position, that is, the movable jaw is farthest from the fixed jaw, and the material enters the crushing cavity at this time. Then, the movable jaw gradually approaches the fixed jaw, and the material is crushed by squeezing, splitting and breaking to produce cracks. When the movable jaw approaches the nearest position of the fixed jaw, the crushed material will be divided into several small pieces. When the movable jaw is stretched to the maximum position again, the crushed material will be discharged from the discharge port due to its own weight, and the material larger than the discharge port will fall to the lower part and the newly fed material will be crushed again.