Dynamic Stress Distribution Characteristics of Crushing Wall Under Laminar Crushing

Laminar crushing is the core working mode that enables cone crushers to achieve efficient ore crushing. As the core component directly bearing the crushing force, the crushing wall’s dynamic stress distribution characteristics on its working surface directly determine the liner’s wear rate, fatigue life and the overall crushing performance of the equipment. Problems such as local cracks, uneven wear and premature failure of crushing walls encountered by many mining and sand processing enterprises are essentially closely related to unbalanced stress distribution under laminar crushing conditions.

In the laminar crushing process, the moving cone drives the crushing wall to perform continuous gyratory motion. The extrusion between the working surface and the material layer occurs cyclically with the gyratory cycle, presenting an alternating pattern of periodic loading and unloading. The stress loading phase corresponds to the extrusion stroke when the moving cone approaches the fixed cone: the material layer is compacted and transmits the crushing force, and the compressive stress on the working surface rises rapidly. The unloading phase corresponds to the stroke when the moving cone moves away, during which the stress drops quickly to a low level. The frequency of this cyclic alternating stress is consistent with the swing frequency of the moving cone. Long-term exposure to this stress tends to cause fatigue wear of the liner material, which is the core cause of microcracks and gradual spalling on the crushing wall surface.

Along the axial direction of the crushing wall’s working surface, the stress shows obvious regional distribution differences. The upper feeding area is dominated by impact stress from falling materials, featuring large stress fluctuation, high instantaneous impact peak but short duration, with impact chiseling as the main wear form. The middle parallel crushing zone is the core area of laminar crushing action, where the material layer is fully extruded and compacted. The stress here is mainly sustained compressive stress, with the peak stress occurring in the middle of this zone. With long action time and wide coverage, this zone is where the wear of the crushing wall is most concentrated. In the lower discharge area, materials are gradually crushed and discharged downward. The compressive stress is gradually released as the material layer loosens, the overall stress level is low, and the wear rate is relatively slow.

Extending inward from the working surface of the crushing wall, the stress follows a distribution pattern of rapid attenuation. The surface layer bears high contact compressive stress, directly subject to the extrusion and friction of materials. An obvious shear stress zone forms in the subsurface layer, which is the main region where material plastic deformation and subsurface crack propagation occur. At deeper positions, the stress gradually attenuates to the matrix stress level, with little impact on wear and failure. Compared with the single-particle impact crushing mode, laminar crushing benefits from the buffering and dispersion effect of the material layer, resulting in a lower degree of stress concentration. However, it has a wider stress action area and more significant fatigue cycle effect, which imposes higher requirements on the toughness and fatigue resistance of the material.

By integrating the stress distribution characteristics of laminar crushing, optimizing the chamber structure, material formulation and heat treatment process of the crushing wall can effectively balance the stress distribution and extend the service life of the liner. Hunan Xiangjian Machinery Technology Co., Ltd. specializes in mining wear parts. It can provide stress-optimized crushing wall products and matching selection solutions based on the parameters of users’ on-site laminar crushing conditions, helping enterprises reduce spare part loss. For more product details, please visit https://www.xjgmg.com.