Optimum Design And Experimental Research On Rotor Structure Of Hammer Mill

The hammer fodder mill has a hundred years of developing history at home and abroad.Because of its stable operation,convenient operation,high crushing efficiency and wide range of application,it has become one of the most widely used equipment in the crushing industry.The rotor structure is an important part of hammer fodder mill,and its structure directly affects the crushing performance and operation effect.Aiming at the problems of vibration,noise and low crushing efficiency during the operation of the CPS-420 hammer fodder mill,this paper carries out the optimal design and study of the rotor structure of the hammer mill.The main research contents are as follows:1 Based on the relevant theories of theoretical mechanics,kinetic energy theorem and fluid mechanics,the crushing process of materials in the crushing chamber is analyzed.And combined with the dynamic characteristics of material crushing,the design scheme of v-shaped hammer structure with broken line is proposed.This hammer mainly includes a V-shaped hammer head and a hammer body with an inclination.2.Using ANSYS Workbench software,the static and modal analysis of the new hammers are carried out.The results of static analysis show that the stress range of the new hammers is 0.0145 to 26.37 MPa,the maximum stress is concentrated in the circular hole matched with the pin shaft,and the maximum deformation occurs at the end of the hammers,the value is 31.91? m;the results of modal analysis show that the first-order natural frequency is 7.566 Hz,which is quite different from the exciting frequency of the pulverizer,will not resonate,and has better dynamic characteristics.3.On the basis of mechanical analysis and modal analysis,the topological optimization analysis of hammer plate structure is carried out.The results show that the stress range of hammer plate is 0.089 to 167.41 MPa,and the edge of pin hole matched with pin shaft is the dangerous area of stress concentration;the maximum deformation of hammer plate occurs near pin hole,and the deformation is 24.65 ?m;the hammer plate has better dynamic characteristics;after topology optimization,the hammer plate structure has stable performance and 35%material saving.4.Through single factor experiment and orthogonal test,the inclination of the hammer,the angle of the hammer head and the inclination distance are taken as the factors,and the productivity and power consumption are taken as the indexes,which are to test and study on the crushing performance of hammer mill.The test results show that the optimal parameter range of the inclination of the hammer is from 150° to 160°,the optimal parameter range of the angle of the hammer head is from 100°to 120 °,and the optimal parameter range of the inclination distance is from 24 to 30 mm.The primary and secondary order of factors and the optimal parameter combination which affect the crushing performance are the angle of the hammer head(150°),inclination(110°)and inclination distance(24 mm).This study can provide theoretical reference and data support for the optimal design of hammer fodder mill.