Control system of injection molding machine

Abstract

Provided are a control system of an injection molding machine and a control method thereof. The control system of the injection molding machine is characterized in that (1) a digital communication protocol is built between an injection molding machine controller and a servo driver, and action command is sent to the servo driver in a digital communicating method; (2) information which the injection molding machine controller sends to the servo driver comprises pressure control signals, flow control signals and servo driver response speed control signals; (3) a plurality of pressure sensors are arranged, one end of each pressure sensor is connected with a required detection point, the other end of each pressure sensor is directly connected with the injection molding machine controller so that a plurality of pressure sensor signal feedback systems are formed; and (4) the pressure sensors and a rotating speed sensor are directly connected with the injection molding machine controller so that automatic closed-loop regulation of pressure and flow is achieved.

Description

technical field [0001] The invention relates to the field of injection molding machines, in particular to a control system of the injection molding machine. Background technique [0002] Existing technology as attached figure 1 As shown, the analog communication is carried out between the injection molding machine controller and the servo driver, and the injection molding machine controller sends the pressure and flow instructions of the machine action to the servo driver. The servo driver controls the servo motor of the injection molding machine according to the calculation of the feedback signal of the pressure sensor. According to the instructions given by the controller of the injection molding machine, the servo drive can only provide a fixed response speed. [0003] But existing technology has following shortcoming: [0004] (1) The controller of the injection molding machine sends an analog signal to the servo drive for control. Because the analog signal is unstabl...

AI Technical Summary

Problems solved by technology

However, the response speed required for each action is not the same, which creates a problem, that is, if the response speed is adjusted to be fast, then when the action that does not require fast response is running, hydraulic shock and motor vibration are likely to occur, causing the machine to Life is affected; if the response speed is slowed down, some actions that require fast response will not be able to achieve good results, reducing the performance of the machine and wasting the high response capability of the servo system

[0006] (3) In the prior art, because the pressure sensor signal is fed back to the servo driver, the servo driver can only receive one pressure sensing signal

Therefore, the closed-loop control formed by the control system is a local closed-loop control, and it cannot be expanded to achieve a higher-precision multiple pressure sensor signal feedback processing system, which restricts the improvement of the performance of the injection molding machine.

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