This paper conducts a comprehensive study on the optimization design for crushing mechanism of double toggle jaw crusher. The optimization aim is to reduce characteristic value of moving jaw plate, to raise capacity of jaw crusher, and to ensure entrance and outlet dimensions of jaw crusher. Firstly, formulae are derived for displacement of the topmost point and the bottommost point of moving jaw plate, and for the meshing angle between moving jaw plate and fixed jaw plate. Secondly, an optimization design model is established for the crushing mechanism. Finally, with C＋＋ programming and half-penalty function method, an optimization design program is compiled for crushing mechanism of double toggle jaw crusher. Optimization is carried out for the crushing mechanism of PEJ900×1200 double toggle jaw crusher, and the optimization result is satisfactory. In the optimized crushing mechanism, the entrance and outlet dimensions and the maximum meshing angle and horizontal strokes of the topmost point and the bottommost point of moving jaw plate completely meet the design requirements. So, this paper makes it possible to raise the quality of double toggle jaw crusher.
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