The Analysis Of Rotor Dynamics And Static Strength Of Anthracite Coal Crusher Hammer Type Rotary Table

Anthracite coal crusher has the characteristics of simple structure,compact size,less weight,continuous and reliable operation.Through the finite element software,the dynamic and static analysis of the lignite crusher is carried out,the following conclusions were obtained:In static analysis,the influence of centrifugal force and partial load on the rotary table is considered.The stress distribution of the rotor in the centrifugal force and the partial load are obtained respectively.The results show that the structure of the hammer is safe.The analysis of the characteristics were performed by discrete quality model and the finite element methods,especially considering the influence of the gyroscopic effect in high speed rotor.It is found that the mathematical model is more accurate in the low order modes,the finite element method has good simulation results for the structure of the crusher hammer rotary table.Through the modal analysis of rotor,the first ten order natural frequency and vibration mode of the rotor are obtained.Using CAMPBELL diagram of the rotor system,the first two order critical speed of the rotor is obtained,found that the rotor is a rigid rotor.In addition,comparative analysis of the critical speed of the rotor in two cases by considering and no considering the gyroscope effect,it is verified that the effect of the gyroscope can increase the stiffness of the rotor.Make a thorough inquiry of the influence of rotor system supporting stiffness,rotary quality,bearing span on the critical speed,to provide guidance for the design of crusher.Through the harmonic analysis of rotor,the amplitude frequency response curves of the rotor are obtained.Which shows the response of the rotor to a simple harmonic excitation at different frequencies,the analysis results are in agreement with the results of modal analysis.Through the transient unbalance analysis of rotor,the rotors’ mass center response curves of the amplitude versus time during the starting process of different acceleration are obtained.Find the most suitable starting acceleration to make the rotor start and work smoothly.Through the buckling analysis of rotor,we get the conclusion that the buckling deformation of the rotor will not occur even in the most dangerous situation.At last,the rotor system is optimized by using response surface optimization method.The internal stress distribution of the hammer type rotating disc was improved significantly.The maximum deformation and mass of the rotor is reduced.After optimization,the cost is reduced.By examining the optimized rotors’ critical speed,found that optimization is very feasible.