The core working components of a jaw crusher consist of the moving jaw die and the fixed jaw die, which bear huge impact forces and material friction during the crushing process, making them prone to wear. To enhance the durability of the equipment, Duma Machinery installs wear-resistant liners (also known as crushing plates) on the surfaces of the moving and fixed jaws, effectively extending the service life of the equipment.
1.Structural Optimization of Crushing Plates
Manganese jaw plates (made from Mn13 material) are typically designed with a toothed structure, with tooth peak angles ranging from 90° to 120°, and the specific value needs to be adjusted based on material hardness and crushing granularity:
● For large material crushing: Use a larger tooth peak angle to enhance impact resistance.
● For small material crushing: Use a smaller tooth peak angle to improve crushing efficiency.
● Tooth spacing design: Typically 1/2 to 1/3 of the discharge opening width, which directly affects the discharge size.
Due to uneven stress distribution during the operation of jaw crusher wear parts, the lower part experiences much higher wear than the upper part, so optimizing the liner structure is crucial to prolonging the service life.
2.Material Selection and Heat Treatment Process
Currently, manganese jaw plates (Mn13) are an excellent choice for jaw crusher wear parts, with advantages such as:
✔ High toughness: Hardness of approximately 210 HB, but with cold work hardening properties that continuously strengthen under sustained pressure.
✔ Wear resistance: Surface hardness increases during wear, significantly extending the service life.
✔ Water toughening treatment: Heated to 1000~1100°C and then rapidly cooled to stabilize the metallographic structure and prevent performance degradation.
Although manganese jaw plates are more costly, their cost-effectiveness in terms of overall service life and maintenance costs far exceeds that of standard materials.
3.Design Improvements and Maintenance Strategies
● Optimization of moving and fixed jaw dies: A design that moves the tooth peaks towards the tooth valleys allows the material to be subjected to both compressive and bending forces, improving crushing efficiency.
● Symmetrical structure: Small crushers use symmetrically designed wear-resistant liners, which can be adjusted or swapped after wear; larger equipment requires optimized stress distribution.
● Regular maintenance: Inspect the wear of crushing plates regularly and adjust or replace them promptly to avoid reduced production efficiency due to excessive wear.
Conclusion
The reasonable design and material selection of jaw crusher wear parts (such as manganese jaw plates, moving jaw die, fixed jaw die, and wear-resistant liners) directly affect the equipment's lifespan and operational costs. With advanced material technology and structural optimization solutions, Duma Machinery provides customers with highly durable, long-lasting crushing plate solutions. Feel free to contact us for consultation and cooperation!
