Vibration calculation of the plate knives in refining machines

Abstract

The subject of research is the method of vibration calculation of the plate knives. The study of the shapes and frequencies of free oscillations of knives was carried out using the finite element method and analytics. The error between theoretical and experimental studies does not exceed 9%. A diagram is proposed for determining the resonant modes of the plate knives. The proposed measures to reduce oscillations and dynamic stresses of the plate knives are as follows: change of the frequency of the rotor rotation; change of the length of the knives; change of the crossing angle of the rotor and stator knives; the choice of material for knives; use of damping devices in the plate design. The plate with interchangeable working elements and a headset with damping devices of knives are proposed and protected by patents for useful models. The developed method of vibration calculation can be used in other industries, for example, in mining and metallurgical industries. © Published under licence by IOP Publishing Ltd.