Abstract: In order to study the influence of moving roll deflection on the force distribution and operation stability of the roll surface of the high-pressure roller mill,based on the coupled simulation technology of discrete element method (DEM) and multi-body dynamics (MBD),the analysis model of roll deflection and support structure of high-pressure roller mill was con structed,the parameter calibration test of Tavares crushing model was carried out with vanadium titanomagnetite ore from Chengde,Hebei Province as the object,the physical and contact parameters of the particles were determined by uniaxial com pression and collision experiments,and the lognormal distribution model of fracture energy was established.Combined with the typical non-uniform feeding conditions,the dynamic changes of roll clearance,axial pressure distribution and bearing load in the allowable and prohibited deflection states of the moving roller were simulated and analyzed.The results show that,compared with the condition of prohibiting deflection,the moving roller deflection has good adaptive adjustment ability,which significantly improves the uniformity of axial load distribution on the roller surface,alleviates the local peak pressure and impact load,and significantly reduces the fluctuation amplitude of bearing load,which helps to reduce the fatigue risk of the supporting struc ture,improves the operation stability of the system,and provides a theoretical basis and technical support for the dynamic simu lation and engineering application of complex crushing equipment.

Key words: high-pressure grinding rolls,coupled simulation,roll skewing,Tavares crushing model