Design Of Compression-shear Mixed Electrorheological Elastomer Vibration Isolator For Vibrating Screening Equipment

Coal is my country’s main basic energy source and plays a vital role in national economic development.Coal,as a non-renewable energy source,will eventually face the problem of depletion.Therefore,efficient and clean utilization of coal is an important means to ensure energy security and protect the environment.As an indispensable mechanical equipment for industrial sorting and de-intermediation operations,vibrating screening equipment can screen and wash coal,which not only improves the utilization rate of coal,but also reduces carbon emissions.It has played an important role in promoting the realization of my country’s "dual carbon" goal.In the practical application of the vibrating screen,when the vibrating screen is started or stopped,the vibrating screen will resonate through the resonance area,and the resonance will cause the amplitude of the vibrating screen to increase sharply,which will not only damage the service life of the vibrating screening equipment,but also generate a large load on the foundation and affect the surrounding buildings.In order to isolate the impact of the vibrating screen operation on the installation foundation,a vibration isolator device is usually installed between the vibrating screen and the foundation.Traditional vibration isolators often use metal springs or rubber springs as vibration isolation elements,because their stiffness and damping cannot be adjusted,so that it cannot be changed according to the actual working state of the vibrating screen,so that it fails to have a good vibration isolation effect on the vibrating screen.For the above problems,this paper adopts a new type of smart material electrorheological elastomer(ERE)as the research basis.According to its variable modulus and damping performance parameters under an applied electric field,a compressive-shear mixed mode electrorheological elastomer vibration isolator is designed.It provides a new idea for vibration isolation research of vibrating screening equipment.The specific research contents are as follows:(1)The basic principle of vibration isolation and the working characteristics of the vibrating screen are discussed,the reason and phenomenon of the vibrating screen resonance are theoretically researched,and the influence of frequency and damping on the vibration amplitude of the vibrating screen is analyzed,which is the basis for the subsequent design studies of electrorheological elastomer vibration isolation.(2)The electrorheological elastomer material was prepared,and the performance of the electrorheological elastomer under different working conditions was experimentally tested.Using MATLAB software to fit the experimental data,the functional relationship between the storage modulus,loss factor and electric field strength is obtained,and deduce the equivalent stiffness and equivalent damping of electrorheological elastomer vibration isolators.Finally,the four-parameter standard solid-state model is selected as the constitutive model to describe the relationship between the stress and strain of the electrorheological elastomer,which lays the foundation for the dynamic analysis of the vibration isolator system.(3)Design of the structure of the compressive-shear mixed electrorheological elastomer vibration isolator.The three-dimensional model of the vibration isolator is drawn by Creo software,and the size of the vibration isolator is calculated according to the parameters of the vibrating screen.The modal analysis and dynamic simulation analysis of the vibration isolator system were carried out by using Workbench and Simulink software,analysis of variable stiffness effect and resonance suppression capability of vibration isolator,which provides a concrete basis for the trial production of electrorheological elastomer isolators.(4)Create a real vibration isolator,and the compression performance of the vibration isolator is tested by using a universal testing machine,and the stiffness change of the vibration isolator under different electric field strengths is observed.Finally,a vibration test platform is built to test the vibration isolation performance of the isolator.The test results show that when the vibration-isolated object resonates during startup and shutdown,with the increase of the applied electric field of the vibration isolator,the resonance amplitude value and the shutdown time of the system gradually decrease,which plays a good role in reducing vibration and energy consumption;After the system reaches a stable working state,removing the applied electric field can reduce the damping ratio of the vibration isolator,thereby reducing the vibration isolation transmissibility,which is more conducive to the vibration isolation of the system.Therefore,according to the different working states of the system,the vibration isolator can achieve the best vibration isolation effect by adjusting the strength of the applied electric field,which provides a reference for the subsequent application of electrorheological elastomer vibration isolators in vibrating screening equipment and other vibration equipment.