Motor Power Interrupting Device for Injection Molding Machines
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Solution Overview
Problem
The existing motor power interrupting systems in injection molding machines require a varying number of servo amplifiers based on machine specifications, leading to increased costs due to the need for corresponding interruption request signals for each servo amplifier.
Innovation Solution
A motor power interrupting device that outputs a single interruption request signal to multiple servo amplifiers, with a controller unit to determine normal operation based on interruption confirmation signals and used/unused information, allowing simultaneous power interruption of servo motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of servo amplifiers is increased to meet machine specifications, then the machine can provide greater mold clamping force or injection pressure, but the cost increases due to requiring more interruption request signals and safety components
Solution Approach 1:
The patent combines multiple interruption request signal functions into a single integrated switch mechanism. Instead of requiring separate interruption signals for each servo amplifier, a single switch can control power interruption to all servo amplifiers simultaneously, reducing the number of safety components while maintaining safety functionality across multiple high-power motors
Solution Approach 2:
The switch mechanism is designed with multi-functionality to control multiple servo amplifiers through a single interruption signal. This universal switch can manage power interruption for different mechanisms (mold clamping, injection, ejection) regardless of how many servo amplifiers are configured, making the safety system adaptable to various machine specifications without increasing component count
2Reliability
If separate interruption request signals are provided for each servo amplifier, then safety control is precise for each motor, but the device complexity and cost increase
Solution Approach 1:
Multiple interruption request signal functions are merged into a single switch mechanism that can control power to all servo amplifiers simultaneously. This maintains safety reliability by ensuring all motors can be interrupted, while reducing the number of signals from multiple individual controls to a single unified control mechanism
Solution Approach 2:
The control system is segmented into a master switch level and servo amplifier level. The single switch operates at the master level to trigger power interruption, while each servo amplifier independently responds to the interruption signal, maintaining precise control reliability without requiring multiple physical switch components
3Device complexity
If a single interruption request signal controls multiple servo amplifiers, then cost is reduced, but the ability to detect abnormalities in individual amplifiers may be compromised
Solution Approach 1:
The system incorporates feedback mechanisms where each servo amplifier reports its status independently to the control system. Even though a single switch controls power interruption for multiple amplifiers, each amplifier maintains independent feedback capability, allowing the controller to detect abnormalities in individual amplifiers and provide precise diagnostic information
Data Source
AI summary
A controller of an injection molding machine stores used/unused information in relation to each of the maximum number of controllable servo amplifiers, outputs an interruption request signal requesting power interruption in a lump to apart of or all of these plurality of servo amplifiers, and receives a power interruption confirmation signal confirming that the motor power of the servo amplifiers is interrupted. Further, the controller determines, on the basis of the interruption request signal, the power interruption confirmation signal and the used/unused information, whether or not interruption driving the servo motor is normally operated.