VIBRATION AND SHOCK ANALYSIS AND RESEARCH OF DIFFERENT MATERIAL FLOWS ON TRANSFER POINT OF BELT CONVEYORS

There is a certain height difference between the two belts at the transfer point of the belt conveyor in the coal preparation plant.Affected by factors such as the size of the coal block on the upper end face and the water content,it will cause different degrees of vibration impact on the belt conveyor,thus affecting the service life of the belt conveyor body and the roller.In order to explore the influence of the material flow on the vibration impact of transfer point,combined with field investigation and related theories,it was concluded that the main influencing factors of blanking impact are material flow particle size level and water content.Then,the field test was carried out by using optical fiber vibration sensor,data acquisition card and Labview test system.The vibration signals of the belt conveyor under the blanking port under the impact of different material flows were collected and processed.The test results show that the vibration impact of different particle size material flows on the transfer point is different.The peak value of the vibration waveform of the small particle size material flow on the transfer point is 20%of the large particle size material flow,and the peak value of the self-power spectrum waveform is 0.625%.Different water content has different vibration impact on the transfer point.The peak value of the vibration waveform of the material flow with less water content is 60%of the material flow with more water content,and the peak value of the self-power spectrum waveform is reduced to 45%.The research results provide a reasonable method for reducing the vibration impact of the belt conveyor transfer point.