Fracture dynamics analysis and experimental study on graded crushing process

Therotationalspeedofthetoothedrollscrusherisakeyparameterforcontrollingtheparticle sizeofthecrushed product.At present,the determination of the rotational speed isin a qualitative stage.Thereisnocorrespondingtheorytoguide.BasedontheGrady-Kippdynamicfracturemodel,the relationshipbetweenloadingspeedandproductparticlesizeisanalyzed.The　 anthraciteandgangue crushedatdifferentloadingspeedswascarriedoutbydrophammertestmachine.Theresultsshowthat theaveragesizeofthetwomaterialsdecreaseswiththeincreaseofloadingspeedwithpowerlaw.The testresultsverifythecorrectnessofthefracturemodel,andprovideareferenceforthedeterminationof theloadingspeedoftoothedrollscrusher.