Influence Of Strong Magnetic Field Environment On Straight-Line Driving And Body Stress And Strain Of Inspection Vehicle

The intelligent sensing inspection vehicle for molten state of aluminum reduction cell can replace the current manual inspection,and automatically detect the aluminum level and electrolyte temperature of the cell,so as to reduce the labor intensity of workers,achieve accurate aluminum production and improve labor productivity.However,the operation environment of the inspection vehicle is 5×10~5A aluminum electrolysis workshop,and the strong magnetic field environment of large capacity aluminum electrolysis cell will make the electrical control components of the inspection vehicle invalid and unable to work normally.This paper studies the influence of strong magnetic field environment on the straight-line driving performance and body stress-strain of the inspection vehicle,and provides the corresponding theoretical basis for the automatic navigation and body structure design of the intelligent inspection vehicle.The main work contents include:(1)The field measurement experiment of magnetic induction intensity in 5×10~5A aluminum electrolysis workshop was carried out,and the maximum magnetic induction intensity in the operation section of inspection vehicle was determined to be 300Gs,which was taken as the design index of magnetic field environment.The important electrical control components of the inspection vehicle must be placed in the shielding box.According to the shielding effectiveness test data of the magnetic field shielding material,silicon steel is selected as the magnetic field shielding material and the shielding box is designed in combination with the magnetic field shielding theory.Using ANSYS electronics software to simulate the magnetic field environment of aluminum reduction cell,the stress condition of inspection vehicle under different magnetic induction intensity environment is analyzed,and the attenuation effect of shielding box on magnetic induction intensity is studied.(2)The dynamic analysis model of the patrol inspection vehicle in the strong magnetic field environment is established.Through simulation calculation and analysis,it is concluded that the positive pressure of the patrol inspection vehicle to the ground increases by 3.55%in the strong magnetic field environment of 300Gs.(3)The virtual prototype analysis model of the inspection vehicle in the strong magnetic field environment is established,and the straight-line driving performance of the inspection vehicle in the environment of different magnetic induction intensity is studied by using ADAMS software.The simulation results show that if the deviation correction control is not carried out for the aluminum electrolysis inspection vehicle,the magnetic induction intensity in the operation environment of the inspection vehicle will increase from 140Gs to 220Gs,and the deviation of 100m straight-line travel will increase from 2.43m to 7.02m.Under the highest magnetic field of 300Gs,the inspection vehicle deviated 12.3m when traveling in a straight line for 100m.(4)The finite element stress-strain simulation analysis model of the inspection car body is established,and the finite element analysis of the car body frame is carried out by using ANSYS Workbench software.Through the structural optimization design,the body weight of the inspection vehicle is reduced by 80kg.The influence of strong magnetic field on the stress and strain of patrol car body is studied by using the comparative analysis method.The results show that the strong magnetic field environment will increase the maximum stress and the maximum strain of the car body.Under the 300Gs strong magnetic field environment,the maximum stress value of the inspection vehicle body frame increases by 4.16%,and the maximum strain value increases by 8.09%.