Servo energy-saving driving control system and method of injection molding machine

Abstract

The invention relates to an injection molding technology and aims at providing servo energy-saving driving control system and method of an injection molding machine. The method comprises the steps as follows: a processor module receives a given pressure value and a given speed value of a hydraulic system as well as a real-time pressure value P of the hydraulic system of the injection molding machine, and obtains a speed control signal U of an injection molding hydraulic servo system through a built-in computing and controlling program; an analogue output module converts the speed control signal U into an analogue signal and then outputs the analogue signal to an injection molding hydraulic servo system module for controlling; and the processor module works in a speed control mode or a pressure control mode, and a servo driver always works in the speed control mode. The servo energy-saving driving control method provided by the invention has the advantages of simplicity, reliability, no need of a speed sensor, feasible control system and realizability. The key point of the invention is that the control problem of servo driving of the hydraulic system of the injection molding machine is solved, accurate closed-loop control of the hydraulic system is decoupled from pressure and speed control, the speed and the pressure can be accurately controlled, and the switching process is stable without overshoot.

Description

technical field [0001] The present invention relates to the control system and method of the injection molding process. More specifically, the present invention relates to the servo system control method of the servo motor-driven hydraulic system injection molding machine, which realizes the precise closed-loop and energy-saving control of the speed and pressure of the hydraulic system of the injection molding machine. Background technique [0002] Injection molding machine is the main equipment for processing polymer materials. Injection molding is the most advantageous polymer processing and molding process because it can realize one-time molding of complex-shaped products, has the characteristics of high efficiency, accurate size, and is suitable for mass production. . At present, injection molding machines are mainly divided into three types: hydraulic type, all-electric type and electro-hydraulic hybrid type. The hydraulic type is the most important injection molding ma...

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Problems solved by technology

[0005] ZL201110043494.8 proposes an energy-saving control system for injection molding machines, but only involves the underlying structure of the hydraulic system of injection molding machines driven by servo motors, but does not involve how to control the key servo systems and control algorithms

ZL200710069994.2 proposes a servo energy-saving control system for injection molding machines, and designs a servo motor-driven injection hydraulic system based on an energy-saving controller. However, it only proposes a system framework, without involving the specific algorithm and control parameters of the control system, and cannot be realized in detail. failed to obtain authorization

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