Introduction to the Role of Jaw Plate of Jaw Crusher

The front wall of the rack is fixed on the fixed crushing plate through the countersunk bolts. Most of them are placed vertically. The moving jaw of the jaw crusher is placed with a tilt angle of 15 ° to 25 °. On the surface of the moving jaw, the moving jaw plate is also installed by the countersunk bolts. The jaw plates have a lot of advantages. First, it can be used as the wearing parts for replacement to protect the jaw body and the rack from being worn. Second, the jaw plate can impose force on the materials so that the materials can be crushed. Since the jaw plate directly contact with the materials, the jaw plate is usually made of the high manganese steel with 12% to 14% manganese. The jaw plate of the small jaw breaker can be made of the white cast iron.
The shape of the surface of the jaw plate is often casted to the wave shape and the triangle. It becomes the longitudinal groove so that the materials can be discharged after they are crushed along the longitudinal groove. In the installation process, the teeth peak of the jaw plate of movable jaw is just aligned with the tooth valley of the fixed jaw, which not only can impose the extruding impact on the materials, but also have the splitting and bending effect to enhance its crushing effect. The jaw teeth peak angle of the jaw plate is generally 900 to 1200 and the ratio of tooth height and tooth pitch is 1/2 to 1/3.
The attrition of various parts of the jaw plate is uniform. Usually, the attrition of the lower part of the jaw plate is fast and 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 into vertically symmetrical shape so that the lower part of the worn jaw plate can be inverted for reuse. The movable jaw plate, fixed jaw plate and the side backplate compose the crushing cavity.
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