关键词: 颚式破碎机, 机架, 优化分析, 有限元分析

Abstract: The finite element analysis software ANSYS was used in the numerical simulation of the frame of CJ411 jaw crusher and the main causes leading to the frame crack were analyzed.The accidental load led to the evolution of the defects in the casting member of the crusher that was under a high stress, leading to the flaws.The high alternating stress produced in long term overload operation facilitated the rapid growth of these flaws, finally leading to the fatigue failure of the frame.On this basis, measures for repairing and improving the frame structure were proposed: to use welded carbon steel components to replace the casting members in the high stress zone and to change the welding to bolting for the connection between the beam and side plates.The numerical simulation comparative analysis of the frame before and after the repair indicates that the repaired frame has a rational stress distribution, and the measures have not only fully utilized the material properties but also greatly reduced the fracture failure probability, achieving a remarkable improvement.This research has not only solved the practical problem but also provides a reference to the frame design optimization of jaw crusher.

Key words: Jaw crusher, Frame, Optimization analysis, Finite element analysis