The fixed crushing plate on the front wall of the rack is installed by the countersunk bolts, most of which are vertically positioned. The movable jaw is installed with a tilt angle of 15 ° to 25 °. On the surface of the movable jaw, we can install the moving jaw plate through the countersunk bolts. The jaw plate plays very important role in the jaw crusher machine. It has the following roles. First, the jaw plate used as the wearing parts which can be replaced can prevent the body of the moving jaw and chassis from wear and tear. Second, the jaw plate can impose force on the materials to crush the materials. Since the jaw plate directly contact with the materials, the jaw plate bears great crushing force. In addition, there is very strong friction between the jaw plate and the materials. As a result, the jaw plate should be made of the materials with high strength and wear-resistant properties. Usually, the jaw plate is made of the high manganese steel containing 12% to 14% manganese. The jaw plate of the small jaw crusher can be casted by the white cast iron. The surface of the jaw table is often casted in triangle shape or wavy shape and forms a longitudinal groove to help the materials crushed can discharge materials along the longitudinal grooves. During the installation process, the teeth peak of the movable jaw plate should aim at the tooth valley of the fixed jaw plate to impose the extrusion, split and bending action on the materials to increase the crushing effect. The angle of the tooth peak of the jaw plate is generally 900 to 1200 and the ratio between the tooth height and tooth pitch is 1/2 to 1/3. The attrition of the various parts of the jaw plat is uniform. Usually, the lower part of the jaw plate is worn fast. The attrition of the fixed jaw plate is faster than the attrition of the movable jaw plate. In order to extend the service life of the jaw plate, the jaw plate is often made to vertically symmetrical shape.
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