Mixed power supply type injection moulding machine system

Abstract

A hybrid power supply type injection molding machine system has a motor-driven injection molding machine body including an injection mechanism and a mold clamping mechanism that are driven by servo-motors; a control device giving a command to said servo-motors to drive said injection mechanism and said mold clamping mechanism in accordance with predetermined program commands; and an electric power supply device for supplying said motor-driven injection molding machine body through said control device with the electric power required for operating said motor-driven injection molding machine body, said electric power supply device including: a first electric power supply unit for supplying the electric power from a commercial power source; a second electric power supply unit having an electric power accumulation unit dedicated to said motor-driven injection molding machine; an electric power comparator for comparing outputs of said first and second electric power supply units; and a switching device for switching over a supply of the electric power given through said control device to said second electric power supply unit from said first electric power supply unit in response to a result of the comparison by said electric power comparator under predetermined conditions.

Description

technical field [0001] Cross-references in relation to applications : [0002] This application is based on the prior Japanese Patent Applications No. 2002-153354 (filed on May 28, 2002) and No. 2003-112936 (filed on April 17, 2003), and claims the benefit of priority of the above-mentioned earlier applications; The entire content of the aforementioned prior application is hereby incorporated by reference. [0003] The present invention generally relates to a hybrid power type injection molding machine system, and more particularly to a power supply system for an injection molding machine. Background technique [0004] Figure 3 is a block diagram showing how conventional power supply works when operating a motor-driven injection molding machine in a molding plant. Referring to Fig. 3, the substation 1 arranged in the factory building PLNT is supplied with commercial high-voltage power from the outside, where the power is reduced to the actual use voltage. The reduced vol...

AI Technical Summary

Problems solved by technology

Small-scale molding plants include one or a few injection molding machines, but rarely provide back-up power generation

Such plants rely solely on commercial power and create the same problems as previously mentioned

[0013] Also, in the injection molding machine of the hydraulic drive system, the same problem arises due to the interruption of the power supply supplied to the variable capacity pump, a plurality of on-off valves, a motor for driving the pump, etc.

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