Analysis And Research On The Dynamic Effect Of Lift Mechanism Of Bridge Crane

With the rapid development of the economy,breakthroughs have been made in information technology,and the manufacturing industry has gradually become lighter,smarter,greener,and more energy-efficient.During the actual use of lifting machinery,the frequent starting and braking cause the mechanism to bear a certain impact and vibration,resulting in elastic vibration of the flexible system composed of flexible parts,which leads to the high maintenance frequency and reduced life of the crane.This paper mainly takes the lifting mechanism of the overhead crane as the research object.Based on the working characteristics of the starting and braking of the lifting mechanism frequently,the influence of the lifting mechanism on the crane under various operating conditions is studied.Firstly,a detailed description of the principle and mechanical characteristics of the series resistance speed regulation mode and frequency conversion speed regulation mode of the overhead crane is given.Secondly,based on the theory of mechanical dynamics,the establishment method and the solution method of lifting mechanism dynamic model and vibration differential equation are introduced.Then,the lifting mechanism of crane is analyzed under the working conditions of rising start,rising brake,and falling brake of heavy objects.In this way,the dynamical differential equations of a multi-degree-of-freedom system that conforms to actual conditions is established and the influence of other factors on the dynamic load characteristics is analyzed.Finally,using Matlab/Simulink simulation,the elastic dynamic load coefficient curve is obtained under two speed regulation modes.It is seen that the frequency conversion speed regulation mode can greatly reduce the elastic dynamic load coefficient of the lifting mechanism,thereby improving its working performance and prolonging its service life.It is fully verified that the frequency conversion speed control system is more reasonable than the series resistance speedregulation control system in the design of overhead crane.So as to find a more suitable speed control mode for hoisting machinery.It has effectively promoted the progress of crane design and manufacturing technology,and has certain engineering application significance.