Control system and method of opening-closing die motor and push-out motor of fully-electric injection molding machine

Abstract

The invention relates to a control system of an opening-closing die motor and a push-out motor of a fully-electric injection molding machine, comprising a computer controller, a PLC (Programmable Logic Controller), an opening-closing die push-out driver, the opening-closing die motor and the push-out motor which are mutually connected. The invention also analyzes the motion characteristics and the dynamic characteristics of a toggle lever mechanism of a five-hinge die-closing double-toggle die closing mechanism object, provides a die protection implementation method of a die closing mechanismunder the driving of a fully-electric motor as well as a die closing mechanism control method and a field oriented control algorithm on the basis of a fuzzy adaptive theory from the angle of a control theory, meets the control requirements on three aspects of the die closing force, the speed, and the position, ensures the reliable closing of the molded die and realizes the opening-closing motion of the die and accurate and stably push-out of products from the die; and the designed DSP (Data Signal Processing) driver ensures that the system has stable reliability under the condition of high load and simultaneously improves the disturbance compensation.

Description

technical field [0001] The invention relates to the field of electric injection molding machines, in particular to a control system and control method for a mold opening and closing motor and an ejection motor of an electric injection molding machine. Background technique [0002] During the injection process of the all-electric injection molding machine, the mold clamping device is a component that ensures the reliable closing of the molding mold and realizes the opening and closing of the mold and the ejection of the product. During injection molding, since the molten material entering the mold cavity still has a certain pressure, the mold clamping devices of many injection molding machines do not have enough clamping force at present, and the mold is opened under the pressure of the molten material, resulting in product overflow or Decrease the precision of the product. [0003] In addition, at present, many mold clamping motor drive systems still cannot meet the speed r...

AI Technical Summary

Problems solved by technology

During injection molding, since the molten material entering the mold cavity still has a certain pressure, the mold clamping devices of many injection molding machines do not have enough clamping force at present, and the mold is opened under the pressure of the molten material, resulting in product overflow or Decrease the precision of the product

[0003] In addition, at present, many mold clamping motor drive systems still cannot meet the speed requirements when the mold is opened and closed, neither shortening the no-load travel time nor considering the buffering requirements of the mold opening and closing process, resulting in damage to the mold and parts. Causes low productivity of the machine, subjecting the machine to strong vibration and impact noise

[0004] In addition, many molds cannot meet the requirements of the space position when installing and taking out the product, so that the mold clamping device cannot meet the control requirements of the mold clamping force, speed, and position. The bearing capacity is low, the structure is not compact, and the movement performance is poor. The magnification ratio is relatively small, and it is easy to cause mold expansion during the injection process

[0005]Many ejection devices do not have sufficient and uniform ejection force, controllable ejection times, ejection speed, nor sufficient adjustable ejection stroke. As a result, the product cannot be ejected from the in-mold product accurately and smoothly

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