| As a conventional equipment in mining industry,compound jaw crusher is mainly used for primary crushing of ore,and the excellent motion characteristics of moving jaw is the decisive factor of crusher performance.The improvement of motion characteristics can be achieved by optimizing the size parameters of mechanism,so the key to product performance is to optimize the size parameters of mechanism.At present,the traditional empirical methods are mostly used in the design of compound pendulum jaw crusher in China,but these methods have limitations and blindness.Usually,the strength and rigidity of the designed crusher are difficult to guarantee,which leads to the waste of materials.In this paper,PEF500×750 compound pendulum jaw crusher is taken as the research object,and the mathematical model of crushing motorized jaw is established.Based on MATLAB software,the size parameters of crusher mechanism are optimized.The optimization results show that the stroke characteristic value at the discharge port of movable jaw is reduced from 2.1446 to 1.4440,which is 33% lower than before and after optimization.The optimization effect is remarkable,the crusher’s motion characteristics are obviously improved,and the wear phenomenon of toothed plate is also improved.Based on SPSS Modeler data mining software,the mechanism parameters affecting the characteristic value at the discharge outlet are analyzed.It is found that the abscissa of the rear support point of the frame has the greatest influence on the characteristic value,and the characteristic value increases first and then decreases,with the influence factor as high as 0.30.The mathematical model of crushing chamber of compound pendulum jaw crusher was built.By analyzing the movement mode of materials in the crushing chamber,the crushing chamber was divided into 15 layers based on MATLAB software when the spindle speed was 240r/min,and the compression ratio of each crushing layer was calculated.Static analysis is carried out on the simplified model of crusher,and the stress relationship between mechanisms is analyzed.Calculate the maximum crushing force of the crusher,apply the crushing force to the movable jaw according to the compression ratio,and perform function fitting.lt lays a foundation for finite element analysis of crusher.Solid Works software is used to draw the three-dimensional model of the frame,which is imported into the static analysis module of ANSYS finite element analysis software.Material replacement,mesh division,constraint and load are carried out,and the displacement nephogram and stress nephogram of the frame are output,which provides the basis for the subsequent lightweight design of the frame.The ANSYS Workbench software is used to optimize the frame,which provides a preliminary scheme for the frame parameter optimization.The parameters of the frame are optimized,and under the condition of meeting the strength and rigidity of the frame,the parameters of the frame are optimized with the minimum geometric structure quality as the goal.The weight of the optimized front and rear racks is reduced from the original 6320.3kg to 5676.9kg,which is 10.18% lower,and the lightweight effect is remarkable.The maximum deformation of the frame is increased from 0.29327 mm in the original scheme to 0.30461 mm,but it still meets the design stiffness requirements of the frame.The maximum stress of the frame is reduced from118.14 MPa in the original scheme to 115.47 MPa,and the safety factor is increased,which is more in line with the design strength requirements of the frame,and provides a reference for the rational and economical structural optimization design of the subsequent compound pendulum jaw crusher. |
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