For crushing equipment, a longer service life generally translates to higher efficiency. However, extending service life requires ensuring the wear resistance of the crushing liners. Since the liners are in direct contact with the materials, special materials must be selected to guarantee their lifespan. Today, Xinshengrun will explain how to extend the service life of crushing liners through design, material selection, assembly, and improvements during use.

1. Design and Material Selection

During the design phase, the crushing plates of the moving and fixed jaws should have tooth peaks aligned with tooth valleys. This ensures that during crushing, in addition to compression, there is also a bending effect on the material, making it easier to break. To extend the service life of the crushing plates, the crushing plates of small and medium-sized crushers are designed with a symmetrical shape, allowing them to be reversed for use after the lower part wears out. Large jaw crushers have several symmetrical crushing plates designed so that they can be replaced after wear. To further improve the service life of the crushing plates, manganese steel with a manganese content of 12% or higher is preferred. ZGMn13 is commonly used. Manganese steel has good toughness and cold work hardening characteristics, continuously strengthening under pressure, thus extending its service life.

2. Assembly

During assembly, the crushing plates must be firmly attached to the jaw plates, with leveling between them. Soft metal shims (such as lead or zinc) should be used between the crushing plates and the jaw plates, and bolts should be used for fastening. During crusher operation, the crushing plates should not be loose; otherwise, they are prone to breakage or wear, reducing their service life. Therefore, it is essential to properly install the crushing plates during assembly to extend their service life.

3. Improvements During Use to Enhance Crushing Plate Life

During production, the crushing plates interact directly with the materials, resulting in significant crushing force, especially when crushing materials with high hardness. This can easily lead to bolt vibration and loosening of the nuts, accelerating wear and generating excessive noise. In severe cases, the crushing plates may detach or break, causing equipment downtime and disrupting normal production. Simply tightening the bolts and nuts before starting the machine is insufficient; a case-by-case analysis based on the specific on-site conditions is necessary. For example, spring-loaded anti-loosening vibration damping devices can be used to prevent loosening of the crushing plates during operation, thereby extending their service life and improving work efficiency. The specific method involves using a spring to create a bolt anti-loosening and self-tightening device. This device consists of an inner spring cover, a spring, and an outer spring cover. When this device is threaded onto the bolt and the nut is tightened, the spring is compressed to a certain extent by the nut, resulting in a strong anti-vibration effect. The bolt loosening force generated by the huge crushing force is automatically compensated by the spring tension, so the bolt will not loosen, thereby extending the service life of the crushing plate and improving production efficiency.

In summary, specific problems can be addressed during use to prevent the crushing plates from loosening, aggravating wear, or breaking, thereby extending their service life, reducing costs, and improving work efficiency.