Control device and method for raising injection moulding machine production efficiency using application frequency changer

Abstract

A control device and method for increasing the productivity of injection moulding machine by use of frequency variator to increase the switching speed between technological steps features that the technological parameters and working state signals are set up, the preset time from one step to next step is calculated out, and a frequency control signal for next step is output to the frequency variator when the preset time is reached.

Description

technical field [0001] The present invention relates to a control device and method for improving the production efficiency of an injection molding machine using a frequency converter. Specifically, it is a method for eliminating the speed response delay time for switching between various process sections of the injection molding machine without reducing the productivity of the injection molding machine. Device and method for effectively saving energy. Background technique [0002] In the traditional injection molding industry, the three-phase asynchronous AC motor usually used in the injection molding machine cannot change the speed, and the flow rate of the hydraulic oil output by the quantitative pump driven by it cannot be changed. When the injection molding machine is operating at a low speed, the excess flow flows through the relief valve. Back to the fuel tank, causing a large loss of energy. [0003] An improved injection molding machine is to add a frequency conver...

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Problems solved by technology

[0004] The frequency converter usually adjusts the operating frequency of the motor by sampling the flow rate and pressure output current of the computer of the injection molding machine, but it will cause a delay in the speed response of the switching of each process section of the injection molding machine, prolonging the product production cycle, because after the injection molding machine is equipped with a frequency converter, the main The motor speed changes with the speed of each process section of the injection molding machine. The cycle time of the injection molding machine's working cycle is relatively short, and the frequent switching of each process section causes the main motor to be in the process of acceleration and deceleration frequently. The acceleration and deceleration of the motor has a certain response time. The acceleration response time of each process section switching is determined by the acceleration response time of the motor, which is generally several hundred milliseconds, while the acceleration response time of each process section switching before the installation of a frequency converter is determined by the flow valve response time, which is generally tens of milliseconds, resulting in The speed response time of each process section switching is prolonged, which increases the production cycle time of the injection molding machine and reduces the production efficiency

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