Load And Vibration Characteristics Of Bucket Wheel Slacker Reclaimer Based On Scale Test Bench

Bucket wheel stacker and reclaimer is a large-scale continuous bulk material processing equipment widely used in large-scale open pit mine storage yards,large warehouses,gas power plants and large port terminals.The vibration problem of the cantilever beam during the reclaiming process of the bucket turbine is very prominent,which seriously affects the work efficiency,and even causes structural failure and even collapse of the whole machine.This is closely related to the complex and variable mining object of the bucket turbine,and the excitation source is many and the characteristics are complex.The bucket is subject to the dynamic excavation resistance from the material when excavating the bulk material.In this paper,the experimental platform constructed by DQLZ1200 bucket turbine is taken as the research object.Through the discrete element method and finite element method,combined with the corresponding experimental research methods,the load variation characteristics and load changes of the bucket wheel stacker and reclaimer during excavation are studied.Simulation analysis and experiment on influencing factors,cantilever response and influencing factors of response.The main research contents are as follows:1.According to the similar theory,with reference to the DQLZ1200 model bucket wheel stacker and reclaimer,the experimental platform for the study of the cantilever dynamics of the bucket wheel stacker and reclaimer was designed and built.In order to verify the similarity of the model,the finite element models of the bucket wheel reclaimer and scale model test bench were established respectively,and the modal analysis was carried out.Comparing the modal results of the experimental bench and the bucket wheel stacker and reclaimer,it is verified that the bucket wheel reclaimer and the experimental bench have geometric and dynamic similarities,and lay the foundation for the subsequent response analysis.;2.The discrete element model is established.The process of reclaiming the bucket wheel mechanism of the bucket wheel reclaimer is simulated and analyzed,and the time-varying characteristics of the excavation resistance during the reclaiming process are obtained.The study found that the magnitude of the excavation resistance of the bucket is positively correlated with the speed of the bucket wheel within a certain range,that is,the greater the rotation speed,the greater the excavation resistance.When the range exceeds a certain range,the rotation speed change does not affect the digging resistance;The particle size is negatively correlated,ie the larger the particle,the smaller the resistance to excavation.The particles are too bulky or too small,and the change in particle size does not affect the size of the excavation resistance.The accuracy of the simulation is verified by comparison with the experimental test results.;3.Through the finite element model of the experimental bench obtained in Chapter 2 and the excavation load obtained in Chapter 3,the obtained load data is loaded into the finite element model for transient analysis,and the bucket wheel reclaimer is obtained during the excavation process.The results are analyzed and analyzed.Then,by investigating the relationship between amplitude and vibration stress as a function of digging force characteristics,it is found that when the particle size changes,that is,the excavation resistance becomes small,the structure amplitude and stress become small.When the bucket wheel speed approaches the natural frequency,it will occur sharply.Vibration,that is,amplitude and stress,will have large peaks.Finally,the structure life of the structure is changed through structural optimization;...