A Proportional Valve Online Zeroing Method

Abstract

The invention provides an online zero-adjustment method of a proportional valve, which mainly utilizes a proportional valve control system to feed back a position state signal of a main valve core to judge whether the zero point of the valve core drifts, thereby realizing online accurate zero-adjustment. Since the zero point of the valve is adjusted through the position feedback signal of the main spool, no matter whether the natural zero point of the return spring of the proportional valve is offset or not, the proportional valve can always be guaranteed to work near the real zero point, which overcomes the traditional method due to the mechanical deformation of the spring. The signal error ensures the stability of the proportional valve, and realizes online debugging, which reduces the maintenance workload, does not require investment and purchase of special debugging equipment, can save 8 hours of adjustment and testing time each time, and can reduce downtime by 48 hours throughout the year.

Description

technical field [0001] The invention belongs to the field of instrument debugging methods, and in particular relates to a method for online zero adjustment of hydraulic support roll proportional valves for continuous rolling mandrels in seamless mills. Background technique [0002] Proportional valves are generally used in important quality control systems and are a key link in quality control of finished products. The quality of its working status directly affects the quality index of the product. Proportional valves are prone to production quality accidents under bad working conditions, causing huge losses to enterprises. The mandrel support roll of the continuous rolling mill in the seamless mill adopts a proportional valve double-loop feedback control system. The zero point adjustment method of the proportional valve is based on the position of the feedback rod of the proportional valve spool, and the natural zero point of the return spring is adjusted under the conditi...

AI Technical Summary

Problems solved by technology

But the fatal disadvantage of this method is: if the zero point of the spring is mechanically offset, the electrical zero point will also be offset after the electrical zero adjustment, resulting in unstable operation of the proportional valve.

In addition, the zero adjustment of the proportional valve needs to be carried out in the laboratory, and it needs to be adjusted by special instruments

Therefore, the proportional valve must be processed offline. Once the proportional valve fails to work normally, the entire system will have to be shut down for maintenance for a long time, seriously affecting the smooth progress of production.

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