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The Optimization of Jaw Crusher with Complex Motion Aimed at Reducing Stroke Feature Value of Its Outlet

— The stroke feature value of jaw crusher outlet is an important performance parameter. Usually, the smaller the stroke feature value is, the milder the wear of the jaw liner is, and the higher the efficiency of crusher is. Firstly, the seal vector equation of jaw crusher is built to get mathematical expression of the stroke feature value. Taking the PEF600x900 jaw crusher as an example and choosing the stroke feature value of outlet as an objective function, the optimization model is built. Then based on the model the component sizes are obtained by random direction search method with MATLAB software. Finally the correctness of theoretical calculation is validated by the simulation with ADAMS. The result show that the stroke feature value of outlet decrease by 30.02%. Meanwhile the component sizes reduce greatly, the minimum locking angle diminish a little and the strokes of the swing jaw outlet in both horizon and vertical direction go down. Therefore, the wear of jaw crusher liner declines greatly, the jaw crusher efficiency is improved, and the granularity of product becomes more uniform.