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Injection molding machine

A technology of injection molding machine and molding cycle, which is applied in output power conversion devices, electrical components, conversion of AC power input to DC power output, etc., and can solve problems such as large-scale power converters

Active Publication Date: 2014-12-24
SUMITOMO HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in such a structure, the power converter will be enlarged

Method used

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  • Injection molding machine
  • Injection molding machine
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Embodiment Construction

[0059] Hereinafter, a description will be given of the best mode for carrying out the present invention with reference to the accompanying drawings.

[0060] figure 1 It is a figure which shows the structure of the main part of the injection molding machine 1 which concerns on one embodiment of this invention.

[0061] The injection molding machine 1 is an electric injection molding machine in this embodiment, and includes a servo motor 11 for injection. The rotation of the injection servo motor 11 is transmitted to the ball screw 12 . A nut 13 that moves forward and backward by the rotation of the ball screw 12 is fixed to the pressure plate 14 . The pressure plate 14 is movable along guide rods 15 and 16 fixed to a base frame (not shown). The back and forth movement of the pressure plate 14 is transmitted to the screw 20 via the bearing 17 , the load cell 18 , and the injection shaft 19 . The screw 20 is arranged rotatably and axially movable within the heating cylinder ...

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Abstract

An injection molding machine is disclosed which includes a converter (100) configured to convert electric power from a power supply (200) and supply the converted electric power to a motor (11, 24, 42, 44) via a DC link (300); and a control apparatus (26) configured to control the converter (100) for molding at a predetermined molding cycle. The converter (100) is capable of operating in a forward direction to output the converted electric power to the DC link (300), and in a backward direction to output a converted regenerative electric power of the motor (11, 24, 42, 44) to the power supply (200). The control apparatus (26) instructs the converter (100) to operate in the forward direction in a predetermined time period in the molding cycle such that a voltage of the DC link (300) becomes a predetermined target voltage.

Description

technical field [0001] The present invention relates to an injection molding machine including a control device for controlling a power converter that converts power from a power source to supply it to a motor via a DC link in order to perform molding in a predetermined molding cycle. Background technique [0002] Currently, such a power converter itself is known (for example, refer to Patent Document 1). In the configuration disclosed in Patent Document 1, the power converter includes a single power conversion unit (bridge circuit) and is composed of power transistors and diodes connected in antiparallel to these power transistors. The power converter uses diodes to convert the three-phase AC power supply into DC power by full-wave rectification when the motor is running on electric power. Power is regenerated into the power supply. Also, at the time of motor regeneration, the power converter performs power regeneration when the DC link exceeds a predetermined upper limit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/76
CPCH02M7/797B29C45/7666B29C2045/7673Y02P70/10
Inventor 常深浩基杉浦康介水野博之
Owner SUMITOMO HEAVY IND LTD
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