Research Of Hydraulic Vibration System In Continuous Casting Mould

Mould is one of the important equipment in continuous casting production, its performance plays a very important role in the production capacity of continuous casting machine and the quality of casting blank. The electro-hydraulic servo mould oscillation system controlled by computer have series of advantages: The vibrational force was transmitted evenly by two points. It has stable running in high frequency vibration and the vibration wasn't distortion in high frequency and low frequency. It has accurate vibration-oriented; The structure is compact and simple and the transmission link is few, so the adjustment and the maintenance is very convenient; Using PLC control with high reliability and ability of anti-interference, it can ensure stable vibration waveform long-term; It can change oscillating curve and set vibration wave online, increasing the steel grade. It can improve contact state of slab surface and mould copper wall and enhance the surface quality and reduce cohere leak steel. Therefore, The electro-hydraulic servo mould oscillation system controlled by a computer is development direction of the mould oscillation system.The electro-hydraulic servo drive mould oscillation system is designed in this paper combining the present development situation of the device at home and abroad and is mainly studied the control strategy of this electro-hydraulic servo system.Firstly, according to the Continuous Casting Mould requirement, the hydraulic system is designed though consulting plenty of domestic and foreign literatures, and hydraulic components is chosen reasonably through calculation. Secondly, the mathematical model of the casting machine mould electro-hydraulic servo position control system is established through the reasonable deduction and the dynamic and stability of the system is analyzed by using the model. For solving the stability problem of the system, the author designed the conventional PID controller. According to the conventional PID controller parameters setting bad and performance unsatisfactory question, the author designed the fuzzy PID controller and the fuzzy self-tuning PID controller combining the fuzzy control technology. The simulation in fuzzy logic toolbox of Matlab was done. The simulation results show that fuzzy PID control system have low response time and overshoots, better than PID control and fuzzy self-tuning PID control system have the best effect. Finally, in order to meet the control requirements of the motion synchronization for dual-cylinder with the partial load, the system adopts "the same way" control strategies and respectively with PID control and fuzzy PID controller, the results show that the fuzzy PID can completely satisfy mould vertical displacement of no more than 0.2 mm and can meet the synchronization control precision of the mould...