Molten gel back pressure control system and method for electrically controlled injection molding machine

Abstract

The invention relates to a molten gel back pressure control system and a method for an electrically controlled injection molding machine. The system comprises an embedded controller and a pressure sensor, wherein the pressure sensor is arranged at a gel injection port so as to acquire molten gel back pressure signals; the embedded controller is used for comparing the received molten gel back pressure signals with the preset molten gel back pressure value, so as to obtain the real-time deviation signal; and the embedded controller is further used for performing proportional-integral calculation on the deviation signal, thereby controlling the swiveling speed of a gel injection moor, and the disadvantages that more intermediate sections exist in the normal molten gel back pressure control and the precision is low; as the proportional-integral control is adopted, closed-loop control calculation is directly conducted on the molten gel back pressure acquired by the pressure sensor and the preset molten gel back pressure valve, thereby maintaining constant gel injection pressure; the structure is simple, the parameter is easily adjusted, the dynamic response speed is ensured, and the static error is eliminated; and moreover, no difference degree of the system can be improved, the functions of controlling pressure in real time and accurately controlling the pressure can be realized, and the product quality is greatly improved.

Description

technical field [0001] The present invention relates to a melt adhesive back pressure control system and method, more specifically, to a melt adhesive back pressure control system and method for an electronically controlled injection molding machine. Background technique [0002] When the injection screw is premolded, the calculated pressure of the melt in the barrel is called the melt back pressure. When the injection molding machine is working, the appropriate melt back pressure makes it achieve a good balance between the melt quality and production efficiency. It is one of the important parameters to control the melt quality and product quality in the injection molding process. A suitable and stable melt Glue back pressure plays an important role in improving the quality of injection molded products. [0003] Most of the injection molding machines now use hydraulic oil pumps as the power source. The control object of the melt back pressure is the back pressure of the oil...

AI Technical Summary

Problems solved by technology

The oil circuit back pressure control of the traditional injection molding machine controls the pressure of the injection cylinder. The pressure control accuracy is low, and the detection and control of the melt back pressure cannot be directly realized, so that the high precision requirements of the product cannot be guaranteed.

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