Pressure sensing device and control method of hydraulic electric control system

Abstract

The invention discloses a pressure induction device of a hydraulic electric control system. A pressure induction unit is arranged on a hydraulic pipeline of the hydraulic electric control system, the pressure induction unit outputs pressure signals to a pressure closed-loop control loop, the pressure induction unit comprises a main pressure sensor and a standby pressure sensor, the main pressure sensor and the standby pressure sensor output the pressure signals to the pressure closed-loop control loop through a two-path-input one-path-output switching switch, and output the signals to a PLC, and the PLC outputs switching signals to the switching switch. According to a pressure sensor automatic switching system, a double-pressure detection point spare control mode is used, the automatic switching system is used, free-failure online use is always ensured, and high-precision, rapid-response and good-stability pressure control is always ensured.

Description

technical field [0001] The invention relates to the field of electro-hydraulic control, in particular to an automatic switching system of a pressure sensor in the electro-hydraulic control system. Background technique [0002] At present, the control systems of hot strip rolling mills at home and abroad are basically electro-hydraulic control systems, and all precision control parts (such as loopers, HGC roll gaps, and shape bending rolls) are based on position and pressure feedback. Double-servo closed-loop control, with the continuous improvement of modern rolling mills' requirements for rolling products and finished product quality, the requirements for the accuracy and response speed of key equipment control are also continuously improving. Among them, the accuracy of pressure detection is crucial to the stability and precision of the entire control system. [0003] However, in the actual production process, sudden failures of the electrical components of the pressure s...

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Problems solved by technology

[0003] However, in the actual production process, sudden failures of the electrical components of the pressure sensor often occur, or fluctuations in the pressure detection signal occur under severe vibration, hydraulic system fluctuations, electromagnetic interference, etc., resulting in a decrease in the accuracy of the pressure feedback value, or even an error , leading to a decrease in control accuracy, or even triggering wrong control actions, resulting in a pile-up steel shutdown accident during rolling, as well as equipment damage accidents, which have a great impact on the stable production of the production line

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