Digital hydraulic extruder speed control system and method

Abstract

The invention discloses a digital hydraulic extruder speed control system and a method. The system comprises a speed setting device, a speed measuring device, a controller and a speed regulating mechanism; wherein the speed setting device and the speed measuring device are both connected with the input end of the controller; and the output end of the controller is connected with the speed regulating mechanism. The system is characterized in that both the detection unit and the control unit of the system adopt a digital component, and all-digital communication of signals of each unit of the system is realized through an industrial field bus. In the control method, asymmetric PID regulation is adopted to obtain a speed control implementation signal and to output the speed control implementation signal to the speed regulating mechanism, and then the speed regulating mechanism regulates the opening degree of the valve core of a water throttling valve in the method of controlling water with oil, thereby realizing the closed-loop control of the extruding speed of the hydraulic extruder. The system and the method disclosed in the invention have the advantages of high anti-interference performance, high reliability and high practicability, and realize the high-precision closed-loop control of the extruding speed of the hydraulic extruder in the special environment.

Description

technical field [0001] The invention belongs to the field of electromechanical-hydraulic integrated control, and in particular relates to a speed control system and method of a digital hydraulic extruder. Background technique [0002] As large-scale basic equipment, large-scale hydraulic extrusion machines are an important symbol of a country's manufacturing capabilities, and play a key role in the development of aviation, aerospace, shipping, petrochemical, electric power, military and other fields. Extrusion speed control is of great significance to the production of extruded products. On the one hand, from the perspective of extrusion technology, the extrusion speed is closely related to the material composition, cross-sectional shape, extrusion ratio and other factors of the extruded profile; on the other hand, for To avoid corrugation in extruded products and affect product quality, the extrusion speed must be relatively stable during the same extrusion process. Theref...

AI Technical Summary

Problems solved by technology

At present, most of the speed control systems for large-scale hydraulic extrusion machines at home and abroad stay in the open-loop control stage, with low control accuracy and low production efficiency.

The development of the new speed closed-loop system has the following difficulties: (1) The speed closed-loop system needs a stable and reliable signal detection and control system, and the working environment of large hydraulic extrusion machines is relatively harsh, and the traditional analog detection and control components themselves It is vulnerable to external interference in harsh environments, and its detection and control signals are also easily interfered by harsh environments during long-distance transmission, resulting in inaccurate signals and poor system reliability; (2) Traditional large hydraulic extrusion machines Most of the throttle valve opening control methods use a DC motor to drive the worm gear, and then drive the transmission lever with a nut screw auxiliary mechanism after being decelerated by the reducer, so as to control the opening of the throttle valve core and indirectly control the flow rate. The transmission chain is too long, Low precision and poor valve stability cannot meet the requirements of high-speed and high-precision closed-loop control

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