Dynamic Modeling And Analysis Of Rock Wool Centrifuge

Rock wool centrifuge is a widely used rock wool production equipment.The high-temperature orerock melt passes through four high-speed rotating rollers in turn,and is centrifuged into fibers.Due to the harsh working environment of the rock wool centrifuge,the rotor system is prone to large dynamic response,and the entire system is also prone to large vibration problems.Excessive vibration amplitude will affect the normal operation and performance of the rock wool centrifuge,making the service life of the structural parts of the rotor system shorter,and may even cause more serious safety problems.Therefore,it is very necessary to conduct dynamic modeling of rock wool centrifuge and analyze its dynamic characteristics in depth.Aiming at the rock wool centrifuge currently available in the market,this article first surveyed and mapped the structural dimensions of the whole machine and its parts,drawn a three-dimensional model,and simplified the model.The air ring system,glue spray system and motor drive system of the centrifuge are ignored to facilitate subsequent dynamic analysis.Through three-dimensional modeling,it is found that the dimensions of the main shafts and parts of the four rotor systems are basically the same,only the size of the rollers has large changes.The dynamic modeling analysis mainly uses the rock wool centrifuge No.4 rotor system as the object.Using finite element numerical calculation and ANSYS commercial finite element software,the dynamic modeling of the rotor-bearing support system of the centrifuge was carried out,and the vortex frequency,mode shape and critical speed at different speeds were obtained by calculation,and the Campbell diagram.The numerical method calculates that the first two eddy frequencies of the system are 104.77 Hz and 139.73 Hz,respectively,and the results are similar to the 103.24 Hz and 135.39 Hz results obtained by ANSYS analysis,which verifies the accuracy of the modeling.At the same time,the unbalanced response of the rotor-bearing support system under the operating speed is obtained through numerical analysis.The response speed of the system corresponds to the first two critical speeds,and the unbalanced response is more obvious.Then through the model,the influence of bearing parameters and roller quality on the critical speed of the system is analyzed.Using empirical formula calculation and universal testing machine test to obtain the compression stiffness of the rubber column element.The free decay curve of the rubber column element was tested by the free decay method,and the damping ratio was obtained by analysis and calculation.Based on the rotor-bearing support system,a rotor-bearing-rubber damper system model was established through ANSYS.The first six vortex frequencies of the system and vibration modes are obtained by analysis.Through harmonic response analysis,the unbalanced response curve of the bearing and sleeve contact surface of the system is obtained.And through the transient dynamic analysis,the amplitude curve from the start of the system to the operating speed is obtained.The analysis results found that the system bearings and shock absorbers will have large dynamic problems after being excited,and corresponding improvement suggestions are put forward.On the basis of the rotor-bearing-rubber shock absorber system,a coupling model of the rock wool centrifuge with the rotor system and the box body is established.By means of modal analysis and harmonic response analysis,the dynamic characteristics of the whole machine are obtained.The analysis results show that there are certain shortcomings in the internal structure of the box,which will affect the stability of the rotor system and the whole machine,and certain measures need to be taken to improve.Finally,the vibration characteristics of the rock wool centrifuge rotor system were tested to verify the accuracy of the aforementioned modeling.At the same time,the axis trajectory under different operating conditions and time was observed to understand the vibration characteristics of the system under operating conditions and analyze the system Loading conditions.