The Dynamics And The Excitation Theory Of The Dual-Source Drive System Of Continuous Casting Mold

The drive system of continuous casting mold is one of the key equipment to ensure the high-efficiency and safe operation of the continuous caster.Servo motor with high value and high quality is used to replace the electro-hydraulic servo cylinder to realize the high-precision controllable vibration laws of the mold,which has the outstanding advantages of simple structure,low cost,no pollution and convenient maintenance.Therefore,it is of great significance to design non-sinusoidal oscillation with high reliability,high carrying capacity and the intelligent adjustment of the technological parameters of the oscillation in view of the harsh working conditions such as high temperature radiation,steam corrosion,heavy-load operation and development needs of low maintenance,high operation rate and intelligent control.Non-sinusoidal oscillation equipment driven by single eccentric shaft has the weakness that it can't realize the amplitude of non-sinusoidal oscillation adjusted on line.To fix that weakness a new type of dual-source composite vibrator composed of the mechanical transmission parts(the eccentric shaft connecting rod mechanism)is proposed.The working principle of the dual-source drive system is clarified,and the kinematic model of the dual-source drive system is established.Taking the phase difference of the two servo motor's angles,the fundamental frequency of angular velocity and the fluctuation coefficient of rotational speed as the original variables,the unified expression of non-sinusoidal vibration of mold was constructed.The synchronous control model using in mold vibration based on the motion parameters of servo motor and the online control principle of three basic vibration parameters of mold are proposed.The Newton-Euler method is adopted in this paper to construct the dynamical model of the actuation system,and the analytical solutions of the constraint force of each hinge points and the active torques of two servo motors are derived.The variation of the active torque and the forces of hinge points under different operating conditions is calculated.The results show that the hinge point mainly bears the constraint force in the vertical direction,and constraint force of the hinge point in the middle of the crossbeam of the dual-source composite vibrator is the largest.Two servo motors share the load torque,which does not increase the total power demand of the system.Finally,based on the structure principle of the dual-source composite vibrator,an experimental prototype is designed and manufactured.The vibration velocity of the prototype under different motion parameters of the servo motor are tested and compared with the mold's theoretical velocity waveform.The experimental results are in good agreement with the theoretical results.It is proved that the on-line accurate control of mold amplitude,vibration frequency and waveform slope can be realized based on dual-source composite vibrator.