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Injection molding machines and industrial machinery

A technology for injection molding machines and motors, which is applied in the control of mechanical energy, electromechanical devices, motor control, etc., can solve problems such as reducing reliability and mechanical damage, and achieve the effect of improving reliability.

Active Publication Date: 2021-07-13
SUMITOMO HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the movable mold 645 collides with the action end, it may cause mechanical damage and reduce reliability
In addition, even if the movable mold 645 does not collide with the operating end, unnecessary vibration may be generated, so twisting of the movable mold 645 is not preferable.
The same problem is not limited to injection molding machines and can occur in other pressure generating devices

Method used

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  • Injection molding machines and industrial machinery
  • Injection molding machines and industrial machinery
  • Injection molding machines and industrial machinery

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0053] Figure 5 It is a block diagram of the pressure generating device 100A according to the first embodiment. The rotation sensor 106 is an encoder, and generates a position detection value θ of the rotor of the motor 104 FB . The pressure sensor 108 detects the pressure generated by the pressure generating mechanism 102, and generates a pressure detection value P FB . The power breaker 110 is disposed between the inverter 202 and the motor 104 . The brake 112 is a mechanical brake that decelerates and stops the motor 104 .

[0054] The servo driver 200A includes a current sensor 204 and a brake drive circuit 206 in addition to the inverter 202 and the controller 220A. The current sensor 204 detects the drive current supplied from the inverter 202 to the motor 104, and generates a current detection value I FB . The brake drive circuit 206 controls the brake 112 .

[0055] As noted above, the controller 220A is capable of switching between a normal operating mode and...

no. 2 Embodiment

[0064] Figure 6 It is a block diagram of a pressure generating device 100B according to the second embodiment. output cut-off controller 230B in addition to Figure 5In addition to the output cut-off controller 230A, the PWM signal generator 242 is also provided. The PWM signal generator 242 receives the duty cycle command value D generated by the gradual change command generator 234 REF_SAFE , and generates a command value D with the duty cycle REF_SAFE corresponding to the duty cycle of the PWM signal S PWM_SAFE . The selector 244 selects the PWM signal S in the normal operation mode PWM_NORM , select PWM signal S in safe stop mode PWM_SAFE .

no. 3 Embodiment

[0066] Figure 7 It is a block diagram of a pressure generating device 100C according to the third embodiment. In this embodiment, the driving parameter for safe stop is the current command value I REF . That is, the initial value generator 232 holds the current command value I generated by the pressure controller 222 when the output cut-off command SHDN is asserted. REF0 . Furthermore, the gradual change command generation unit 234 sets the current command value I held by the initial value generation unit 232 REF0 Generates a current command value I that decreases over time as an initial value REF_SAFE .

[0067] The selector 250 selects the current command value I from the pressure controller 222 in the normal operation mode REF_NORM , select the current command value I from the gradual change command generator 234 in the safe stop mode REF_SAFE . The current controller 224 according to the current command value I selected by the selector 250 REF Generate duty cycle...

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Abstract

The invention provides an injection molding machine and an industrial machine which improves the reliability of a pressure generating device. The motor (104) drives the pressure generating mechanism (102). The servo drive (200) controls the motor (104) to cause the pressure generating mechanism (102) to generate the desired pressure. When a stop event that should cut off power to the motor (104) occurs in a state where the rotation of the motor (104) is actually stopped and torque is generated, the servo driver (200) reduces the power to the motor (104) over time. supply electricity.

Description

[0001] This application claims priority based on Japanese Patent Application No. 2017-071300 filed on March 31, 2017. The entire content of the application is incorporated in this specification by reference. technical field [0002] The present invention relates to a pressure generating device for an injection molding machine and the like. Background technique [0003] Injection molding machines are equipped with servo systems that control pressure with motors on the mold clamping shaft, etc. The same servo system is installed in other industrial machines such as servo presses. This type of industrial machinery is equipped with an emergency stop function that stops the power supply to the motor when any abnormality occurs. [0004] Patent Document 1: Japanese Patent Laid-Open No. 2004-351851 [0005] Patent Document 2: Japanese Patent Application Laid-Open No. 8-288325 [0006] As a result of studying industrial machines equipped with an emergency stop function, the pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C45/76
CPCB29C45/7666B29C2945/76525B29C2945/76709B29C45/768B29C45/84B29C2045/848B29C45/66B29C45/76H02K7/06H02P29/00
Inventor 加藤敦羽角信义
Owner SUMITOMO HEAVY IND LTD