Research on debugging condition of vibrating flip-flow screen based on amplitude-frequency characteristics

Abstract

The rationality and stability of the vibrating flip-flow screen have a great influence on its screening performance and processing capability.In this paper,we established a mechanical model to reflect its vibration characteristics based on the theory of double-body damping linear vibration.Through mathematical and dynamic analysis,the main dynamic parameters such as:damping ratio ξ2,eccentricity mass moment Mr,shear stiffness k2x,and mass ratio μ (mass ratio of floating screen frame and main screen frame) on the amplitude-frequency characteristics of the operating point are verified through tests.The results show that the damping ratio has negligible influence on the relative amplitude in the frequency domain,and the mass ratio μ≈0.3 is appropriate,which could not increase the mass of the vibrating flip-flow screen,but also reduce the impact of the material on the vibration system.Adjusted shear stiffness could make the working condition in the stable frequency domain;Increasing or decreasing the eccentricity mass moment can increase or decrease the relative amplitude linearly.The method of first regulating μ,then adjusting k2x,and finally increasing or decreasing Mr is proposed to ensure that the industrial flip-flow screen is located in a stable frequency domain when a reasonable relative amplitude is achieved.This improves the theoretical and technical support of the vibrating flip-flow screen.

Keywords

• vibrating flip-flow screen
• dynamic parameters
• relative amplitude
• amplitude-frequency characteristics
• debugging method