Optimization Design Of Large Gyratory Crusher Chamber Shape

Large gyratory crusher is widely used in the primary crushing stage of the mining industry and is a typical mechanical equipment for medium and coarse crushing of the mineral.Currently,high production capacity and high product quality have become important development directions,but the original gyratory crusher chamber shape is difficult to meet these two performance requirements.Therefore,it is of great significance to improve and optimize the chamber shape of large gyratory crusher.The PXF6089 gyratory crusher of the North Heavy Industry is used as the research object to optimize the chamber shape.According to the working principle of the gyratory crusher,the calculation method of the critical speed of the moving cone is given,and the motion characteristics of the rock material are analyzed.Based on the theory of interparticle breakage,the chamber shape of the gyratory crusher is divided according to the trajectory of the single-particle material and the crushing zones'characters of the gyratory crusher is proposed.According to the crushing zones'characters and the motion characteristics of the rock material,combined with the research results of Evertsson,the productivity calculation model of the gyratory crusher when mineral falls in free fall or sliding is established.Based on the population balance model and the matrix model of the crushing and grinding equipment of Lynch,the model of the interparticle breakage process of the gyratory crusher was derived.Using Evertsson's interparticle breakage experimental data,the method of assigning values to the selection function matrix according to the selection function and assigning values to the breakage function matrix according to the breakage function is given.According to the feed grain size distribution,the crushed product grain size distribution is predicted.The gyratory crusher productivity calculation system was developed in the Visual Studio environment using the Visual Basic.NET programming language,which was able to calculate the gyratory crusher productivity and the crushed product grain size distribution.The multi-objective optimization model is established by using the productivity and the product grain size pass rate of the gyratory crusher as the optimization objective function.The multi-objective optimization model is transformed into the single-objective optimization model by the main goal method,and then the random direction search method is used to solve it.Based on the particle replacement technology in EDEM software,the DEM simulation analysis of the mineral crushing process in unoptimized and optimized chamber shape of gyratory crusher is carried out.The error between the simulation result and the theoretical calculation value is within a reasonable range,indicating the productivity calculation method and multi-objective optimization model is feasible.Most of the research on the productivity of the gyratory crusher is based on the productivity calculation when the material falls in free fall,while in the actual production,the material in the crushing chamber of the gyratory crusher is mostly in the form of sliding.Therefore,the productivity calculation model of the gyratory crusher when the material falls in sliding has certain theoretical significance and application value.