Research On Weld Cracking Perception Method Of Drive Roller Of Belt Conveyor Based On Radials Stress Analysis

Belt conveyor is one of the most important bulk material transportation equipment in modern times.It is widely used in electric power,metallurgy,chemical industry,coal,mining,port,building materials,food and other fields.As the main force-bearing component of the belt conveyor,the roller seriously affects the running condition of the belt conveyor.The establishment of a correct driving drum force model plays a key role in the next step of structural optimization and failure analysis.Building an experimental platform for experimental verification is a necessary means to ensure that the force model is correct.There are many reasons for the failure of the driving roller,and one of the important reasons is the failure of the roller due to the crack of the welding seam.Therefore,the problem of detecting the welding seam cracking of the roller in the field operation is of great significance for improving the service life of the driving roller of the belt conveyor.The thesis analyzes and summarizes the classification and failure modes of the driving drum.It is concluded that under the action of alternating stress,the cracking of the welding seam at the welding of the spoke and the cylinder shell becomes the most common failure form of the driving drum.On the basis of the literature,combined with the lateral characteristics of the conveyor belt,five axial force models are summarized and presented,and the expression of the surface load function of the cylinder shell when the driving roller is stressed is given.Using ANSYS software to carry out finite element analysis of the driving drum,the stress and deformation of the whole drum and various components under different axial stress loads are obtained.Through further research on the finite element analysis results,it is determined that different axial stress models exist stress Difference and strain measurability.The spoke plate is selected as the experimental strain measurement component,and an appropriate measurement path is established to analyze and compare the strain conditions of the spoke plate of different axial stress models.Under the principle of maximum differentiation,28 strain measurement positions are selected.A strain measurement system based on resistance strain gauges was established,and its component parts,selection of related bridges,and methods of pasting strain gauges were introduced.Aiming at the calibration problem of the strain measurement system,the cantilever beam calibration system was selected for data acquisition,and the accuracy of the strain measurement system was ensured by comparing the data results of theory,experiment and ANSYS finite element analysis.The torque loading device is designed to realize the construction of the static test bed of the driving roller.Through the analysis and analysis of the experimental data,it is concluded that the axial load distribution of the experimental roller is consistent with the normal distribution o=0.3 model.Aiming at the problem of detecting the cracking of the welding seam of the driving drum in the working state,a method step for applying a strain measurement system to crack detection is proposed,and the detection accuracy of the method is determined.Summarize the distribution of weld cracking location,and establish the finite element model with weld cracking at different positions.By dividing the rotation process,the path strain comparison chart of the weld crack model and the weld crack model of the corresponding position is obtained.Based on the principle of maximum differentiation,the path strain comparison chart is analyzed and processed to obtain a suitable location for the strain gauge to be welded for a complex stressed structure New methods are provided for crack detection.