Finite Element Analysis And Optimization Of Jaw Crusher

In order to accelerate the upgrade of infrastructure,China is increasing investment in this area.Large numbers of earth and stone materials are in demand in the construction of roads,airports,railways,water conservancy facilities and other infrastructure,besides metallurgy and mining.Therefore,the design and manufacture of a crusher which can fit all kinds of stone material specifications and work stably and safely under a variety of operating environments will be promising in application.By using computers to simulate crushers' work,instead of analogy method,not only can their working process be analyzed scientifically,but it also can improve mechanical properties,decrease these machines' weight and improve their production efficiency,which is of great significance for crusher design.According to the preliminary design of a certain type of jaw crusher,this thesis mainly completed the following work:1.The three-dimensional geometrical models of the crusher were set up by using UG software.2.With the help of ADMAS software,I checked the movement interference by simulating the motion of the four bar mechanism model,and analyzed the motion trajectory of key points.The calculation formula of crushing force has been derived,and the maximum crushing force has been solved.The dynamic analysis was carried out to calculate the stress of each point under five different working conditions.3.In this thesis,probability method is used to deal with the distribution of breaking force,and based on the calculation results,finite element model boundary conditions were determined.Then I loaded the boundary conditions on the model and finished finite element calculation.4.Size optimization and topography optimization were applied to the model.Compared with the original model,the weight was reduced from 90.61 t to 85.56 t.After optimization,the maximum stress of frame was reduced from 254 MPa to 98 MPa,and in the part of moving jaw,the maximum stress decreased from 141.5 MPa to 126 MPa,the safety coefficient was above 2.5.Mechanical properties of the crusher was improved,while raw materials were saved and market competitiveness of products were enhanced.