The Parameter Optimization And Dynamics Analysis Of Different-Speed Mixer

The different-speed mixer is a new type mixer.It integrates with smashing,stirring, kneading, self-cleaning and conveying functions, which can easily resolve theproblem in the high viscosity material stirring and mixing. The stabilization of running,the high or low mixing efficiency and power consumption are together chiefexamination quota of the different-speed mixer. With the developing trend ofhigh-power and large capacity, the inherent frequencies of the different-speed mixerare decrescendos, maybe reaching the same order of the interference exciting force. So,it is becoming more and more important to analyze the stability of the different-speedmixer. The three main characteristics of the different-speed mixer are determined bythe level of designing, which is relatively lower in China. The parameter optimizationand dynamic characteristic analysis of the different-speed mixer is an important anddifficult job. The main works are as follows:Firstly, according to the characteristics of the different-speed mixer, themovement pathway curve formation process of mixer shaft screw flight is analyzedand the new type screw flight is designed, which uses the principle for screw sectionformation of the double screw mixer and the relativity theory of engagement.Secondly, the relation of center distance of mixer shaft and external diameter ofscrew flight, the rational screw flight intermediate diameter angle of helix, the stirringdevice length-width ratio and array fashion of mixer shaft screw flight are got byparameter optimization to improve the stirring performance of the different-speedmixer. In the process of three-dimensional dynamic state simulating of the mixer shafts,the interference is not got between the main mixer shaft and the cleaning shaft, bywhich the design parameters of mixer shafts are rational.Thirdly, the parameterization entity models of mixer shafts are built, whosecritical speed of revolutions are computed and analyzed by using the finite method.The analysis result of the finite method is compared with the analysis result oftheoretical formula.Fourth, the dynamic state load spectrum expression of mixer shaft screw flight isbuilt and the mathematics equation of screw flight steady state response dynamic stressis built according to the design feature and steady state response characteristic of mixershaft screw flight. The parameterization entity models of mixer shaft screw flight arebuilt, which are analyzed by the harmonic response analysis of the finite method. The dynamic characteristics and dynamic response of mixer shaft screw flight are got,which provide the theory for the further design value optimization of mixer shafts.Finally, the stress load of mixer shaft is analyzed according to the operatingprinciple of different-speed mixer. The intensity of the mixer shaft is analyzed by thefinite method in order to verify the parameter's rationality.