Method for controlling vibration hydraulic cylinder of crystallizer

Abstract

The invention discloses a method for controlling a vibration hydraulic cylinder of a crystallizer. The method is characterized in that a prediction controller provided with a corrector, an integrally improved PID (proportion integration differentiation) closed loop controller and a valve forward and reverse control method are adopted to calculate the set aperture of a servo valve SPSV, the set aperture of the servo valve at any moment t SPSV (t) is calculated by the following function: SPSV(t)=KPN*SPSV0(t); SPSV0(t)=SPSV1(t)+SPSV2(t); ER(t)=SP(t)-PV(t); and SP(t)=Aset*SP1(t)+Offset. The tracking characteristic of a hydraulic system is good, thus the crystallizer can completely move according to a preset track. The invention has the advantages of stability, reliability, high control accuracy, fast dynamic response and is easy to maintain. The error between the set amplitude and the actual amplitude is small, frequency tracking is stable, wave form distortion and mechanical shock are less.

Description

technical field [0001] The invention relates to a control method of a hydraulic cylinder, in particular to a hydraulic cylinder control on a hydraulic vibration device of a continuous casting machine crystallizer in the metallurgical industry. Background technique [0002] Mold vibration is one of the key technologies of the continuous casting machine. It is equivalent to a demoulding function. Its purpose is to prevent the billet from being bonded and causing cracking or breakout. At the same time, when the mold vibrates up and down, it periodically Changing the relative position of the molten steel surface and the mold wall is beneficial to improving the lubrication condition of the inner wall surface of the mold, reducing the adhesion resistance and friction resistance, and improving the surface quality of the slab. When the mold moves upwards, the newly born slab shell is bonded with the copper wall to prevent the slab shell from being subjected to greater stress and cra...

AI Technical Summary

Problems solved by technology

Because the system has the characteristics of the set value changing with time and the nonlinearity of the hydraulic components, it is difficult for the traditional control method to achieve the requirements of fast dynamic response, high tracking accuracy and high system stability; and the traditional control method has amplitude Disadvantages of large deviation and severe waveform distortion

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