Dynamic Characteristic Research Of The Spindle System Of The Hang Type Centrifuge

The hang type centrifuge, which is a kind of mechanical equipment that separates the solid from the liquid by centrifugal force, is the key equipment of the sugar enterprises. It is mainly used to separate the saccharose from the massecuite in the sugar enterprises. The rotational speed of the centrifuge is often increased in order to improve working efficiency. However, the problem of vibration becomes more serious as the rotational speed rises, which seriously affect the safety of the machine. The reason for it is that the research of the vibration principle of the hang type centrifuge is not deep enough, and the electromechanical coupling and the solid-liquid coupling are not discussed in detail. These theoretical problems have become the bottleneck of development of efficient sugar equipment. On this occasion, the underlying problems such as dynamic characteristics research of the hang type centrifuge appear more important, which is also the main research purpose of the study. The main research of contains are as follows:The dynamic equation is built by finite element method with the consideration of the electromagnetic parameter, mechanical parameter and massecuite parameter of the spindle system of the hang type centrifuge. Firstly, according to the electromechanical coupling relation when the motor rotor eccentric vibrates, the air-gap field is introduced to the model. The motor finite element model which set the transverse vibration and axial vibration as the nodal displacement is built. Secondly, the transverse vibration and axial vibration is set as the nodal displacement, the spindle finite element model is built by beam element. Thirdly, under the consideration of the coupling function of the massecuite and the basket, the centrifuge basket finite element model is built by triangle plate element. In order to express the shape-function of the massecuite, the massecuite finite model of tri-prism element of six-node is built. According to the connection of the spindle and the centrifuge basket, the basket hub finite model is built with the plastic curve plank element. Finally, on the base of the finite model of the motor, spindle, centrifuge basket and centrifuge hub, the kinetic equation of the spindle system of the hang type centrifuge that global coupled by mechanical-electrical-hydraulic is built.On the base of the nonlinear kinetic equation of the spindle system of the hang type centrifuge, the influence of the hydraulic-solid coupling and mechanical-electrical coupling to the natural frequency of the spindle system of the hang type centrifuge is studied. The relationship of the system parameter and natural frequency is explored, and the conclusions from which are beneficial. The study shows that the solid-liquid coupling decrease the natural frequency of the system, and it has less influence to the first three order natural frequency, but has more obvious influence to the higher order natural frequency. The electromechanical coupling has different influence to the natural frequency of the system.A certain type of the hang type centrifuge is studied in the paper, the dynamic response of the spindle system of the hang type centrifuge is obtained by considering the incentive caused by massecuite misdistribution, and the dynamic characteristics of the spindle system is simulated to verify the feasibility and effectiveness of the theoretical study.