| An underground mobile crusher is designed to solve the problems of hard rock cutting and limited section space of underground roadway, in the research and development of a new type of heading advance equipment with the integral operation of crushing and loading. This paper takes the working mechanism as research object, applying modeling theory and computer simulation technology to explore its mechanical properties and fatigue life.The study first establishes the virtual prototype model of working mechanism under the co-simulation environment of Pro/E and ADAMS, and analyses its kinematics. Then according to the wave mechanics theory of impact mechanical system, impact load calculation model for broken rock by the mobile crusher is deduced, finite element analysis of the working mechanism is done by using analysis software ANSYS Workbench. Then takes working mechanism as a whole, a mathematical model of its structural improvement is established; and leverages the fast, global convergence characteristics of IAFSA algorithm, to optimize the geometry parameters of each hinge point of working mechanism. Finally, finds the fatigue failure positions of structure by predicting the fatigue life of working mechanism. The results show that the biggest stress is 264.0 MPa in the maximum vertical crushing condition and meets the required strength; the lowest fatigue life of small arm and small arm cylinder hinge position is 1.042×107 cycles, and total damage is 0.96, the safety factor is only 1.04. The results offer the foundations of improving its working performance and prolonging the service life. |
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