Control method of opening of large flow throttle valve for water

Abstract

The invention provides a control method of the opening of a large flow throttle valve for water. The control method is characterized in that the position of a piston rod in a proportional servo oil cylinder is controlled by regulating input current of a pilot electro-hydraulic proportional flow valve, and the piston rod drives a valve core of the large flow throttle valve for water to move, thus ultimately controlling the opening of the large flow throttle valve for water; the piston rod is fixedly connected with the valve core of the throttle valve for water by screw threads; an unsymmetrical closed loop PID control method is employed in the control process, input is a given opening value of the large flow throttle valve for water, feedback is the actually detected opening value of the large flow throttle valve for water, the difference e (t) between the given opening value of the large flow throttle valve for water and the actually detected opening value of the large flow throttle valve for water is input into a PID controller, and the PID controller outputs current signals to the pilot electro-hydraulic proportional flow valve. The method has the advantages of high control precision, convenient installation and operation, strong practicability and high reliability.

Description

technical field [0001] The invention belongs to the field of electromechanical-hydraulic integrated control, specifically a method for controlling the opening degree of a large-flow water throttle valve, which is applied to an oil pressure control system mainly based on an electro-hydraulic proportional reversing valve to accurately control large-flow water. The position of the spool of the valve can be controlled to control the excess flow of the large flow water valve. Background technique [0002] Extrusion is one of the most important pressure processing methods. Large-scale extrusion machines are indispensable equipment in aerospace, aviation, transportation, electronic communication, shipbuilding and other industries. One of the important signs. [0003] Extrusion speed is a process parameter that needs to be strictly controlled in the aluminum extrusion process. The extrusion speed is closely related to the composition, cross-sectional shape, extrusion ratio and othe...

AI Technical Summary

Problems solved by technology

Because the original system adopts the self-aligning machine follow-up and the transmission chain is too long, the stability of the valve is poor, and the displacement of the valve stem drifts

Moreover, the whole system is an open-loop system, the control precision is not high, and the control precision and the production efficiency of the press need to be improved urgently.

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