Abstract
Aiming at the shortcomings of traditional vibrating screens with large vibration mass, a double eccentric cam self-synchronous vibrating screen is proposed. The motion differential equation of the vibrating screen system is derived by using Lagrange equation and the steady state solution is obtained. According to Hamilton principle, the synchronization condition of the vibration system is deduced, and the stability condition of the self-synchronization motion is obtained. The influencing factors of synchronization and stability are investigated by using numerical calculation and simulation analysis methods. The results show that stable self-synchronous motion of the vibration system is implemented when the synchronization and stability conditions are satisfied; the value of the stable phase difference of two cams varies in the range of (–1.5 rad, 0), and compared with the residual torque difference, the eccentricity of eccentric cams has a greater impact on the stable phase difference; additionally, a linear motion track of the vibrating screen is achieved.
Highlights
The drilling vibrating screen is the primary solids control equipment for drilling fluid circulation
Self synchronization theory has been introduced into many vibrating machines excited by two eccentric rotors
2) The self-synchronous motion with stable phase difference can be implemented, where the value of the stable phase difference varies in the range of (–1.5, 0) [rad] by adjusting the eccentricity of the cams and the residual torque difference of the motors
Summary
The drilling vibrating screen is the primary solids control equipment for drilling fluid circulation. Self synchronization theory has been introduced into many vibrating machines excited by two eccentric rotors. For improving the exciting force, they applied different methods to achieve synchronous vibration of dual-rotor systems. For traditional vibrating screens, it is often necessary to increase the mass of the eccentric rotors or the power of the exciter to obtain greater exciting force, which will limit the screening capacity and screening efficiency of the vibrating screen. The CCR mechanism can effectively reduce the vibration mass and realize reciprocating motion. The obvious advantages of the cam-type vibrating screen are compact structure and low vibration mass, avoiding the shortcomings of the CCR mechanism with many components. A new type of double cam-driven self-synchronous vibrating screen has been proposed in this paper. By Matlab/Simulink, the factors affecting synchronization characteristics and stability of the system are investigated
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