Impact Characteristics And Fatigue Life Study Of Detection Sensor For The Wear Of Ball Mill Liners

To address the problem that liner wear was difficult to measure directly,the group developed a detection system that can detect liner wear in real time.In field experiments,the liner wear sensor mounted on the ball mill was found to be susceptible to damage when subjected to impact.In order to improve the structure of the sensor and increase its service life,a impact characteristics and a fatigue life study were developed.The main research work of the paper are as follows:(1)The interaction between the particles in the ball mill and the sensor at different liner thicknesses was investigated using the discrete element method in conjunction with the working principle of the ball mill and the particle motion law.Based on the maximum impact force on the sensor at different liner thicknesses,the distribution and variation of the impact force were studied,and the impact load of the sensor in the ball mill drop zone was extracted to provide data for transient dynamics analysis of the sensor.(2)The transient dynamics of the sensor are studied for its impact characteristics and to identify vulnerable parts.The stress response of each part of the sensor under the impact load was analyzed and the maximum stresses of each part were compared for different liner thicknesses to find out the trend of stress changes in each part.Finally,the vulnerable parts of the sensor are identified according to the yield strength of the part material,which provided a theoretical basis for the improvement of the sensor.(3)Fatigue life analysis software was used to calculate the fatigue life of each part of the sensor,and the structure of the sensor is improved based on the results.The transient results were used as the input load to calculate the fatigue life of each part.The structural improvements of the sensor were carried out by combining the transient results and fatigue life of each part.Evaluate the effectiveness of structural improvements by comparing the stress and fatigue life of each part before and after the improvements.(4)The fatigue life of the detection sensor was experimentally studied.A liner wear detection system was built and comparative experiments were conducted on the sensors before and after the structural improvement on the ball mill.The results show that the structurally improved sensor will not be damaged by fatigue during the working cycle of the ball mill.