Modeling And Characteristic Analysis Of Electromagnetic Drive System Of Concrete Pump

The traditional hydraulic piston type concrete pump has been difficult to meet the requirements of energy saving and emission reduction of construction machinery at home and abroad.Electromagnetic guide rail drive technology,as the representative of the new type of environmental protection and energy saving drive technology has many years of development history,the electromagnetic rail drive technology application and piston pump concrete has become an inevitable trend of social development.This paper mainly analyzes the feasibility of applying electromagnetic guide drive technology to piston concrete pump,designs a guide armature drive system to realize concrete pumping,and lays a theoretical foundation for energy saving and emission reduction of reciprocating concrete pump.Firstly,the working mechanism of electromagnetic guide way driving system in piston concrete pump is analyzed.The equivalent circuit model of the driving system is established.The mathematical model of motion is established by analyzing armature force.Matlab/Simulink was used to analyze the motion characteristics of the armature when the feed peak was 300 KA sinusoidal current and other conditions were not changed when the horizontal pumping distance was 150 m,200m,250 m and 300 m.The motion characteristics of the armature of the return pump are analyzed when the feed peak is 30 KA,35KA and 40 KA sinusoidal current without changing other parameters.The results show that it is feasible to drive piston type concrete pump with electromagnetic guide rail,and the parameters of input current and pumping distance are matched.Secondly,the mathematical model of inductance gradient under the linear current and volume current models of the guide rail is established by using the classical Ansoft maxwell’s equations electromagnetic theory and beole-savart’s law,and the main parameters that affect the inductance gradient of the guide rail are the size of the guide rail and the material properties.Based on differential ohm’s law and constant current condition,the principle of current distribution in guide rail is studied.And then to guide to build numerical model,numerical simulation of guide rail,found out the guide rail structure size change on the armature force,guiding force and guide armature contact the influence law of maximum current density,using the orthogonal experiment method to guide rail parameters optimization,the plan for the optimal size of the armature stress increased obviously,guiding force and significantly reduce the maximum current density.Finally,Maxwell simulation software was used to simulate the magnetic field distribution and current distribution of the electromagnetic guide drive system,and analyze the influence law of different material parameters and different time on the magnetic field and current.The influence of different materials on inductance gradient of guide rail is analyzed.The results show that the smaller the magnetic conductivity,the more uniform the magnetic field distribution,the weaker the eddy current effect,and the smaller the inductance gradient.