Torque Detection for Check Ring Closure in Injection Molding
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Solution Overview
Problem
Existing injection molding machines face instability in resin injection due to varying resin viscosity and conditions, leading to inadequate or excessive reverse screw rotation, resulting in inconsistent resin metering and increased metering time.
Innovation Solution
An injection molding machine equipped with torque detecting means, check ring closure state determining means, and screw reverse rotation control means to optimize screw reverse rotation based on detected torque, ensuring reliable check ring closure without excessive resin accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of reverse rotation of the screw is increased to ensure check ring closure, then the check ring closure reliability is improved, but the metering time increases and resin accumulates excessively
Solution Approach 1:
The patent employs torque detecting means to monitor the actual torque during screw forward movement and uses this feedback information to determine check ring closure state. The screw reverse rotation control means adjusts the reverse rotation amount based on this feedback, creating a closed-loop control system that optimizes reverse rotation to close the check ring reliably without excessive rotation that would increase metering time.
Solution Approach 2:
The patent makes the reverse rotation amount dynamic by adjusting it based on detected torque values. Instead of using a fixed reverse rotation amount, the system varies the reverse rotation amount according to actual operating conditions (torque), allowing optimal check ring closure while minimizing unnecessary rotation and metering time.
2Productivity
If the amount of reverse rotation of the screw is decreased to reduce metering time, then the metering efficiency is improved, but the check ring may not close completely causing resin injection instability
Solution Approach 1:
The torque detecting means provides real-time feedback on the torque during screw forward movement, allowing the control system to determine when the check ring has closed. This feedback mechanism ensures that reverse rotation is sufficient to close the check ring completely, maintaining resin injection stability while avoiding excessive rotation that would reduce metering efficiency.
Solution Approach 2:
The patent replaces fixed mechanical settings for reverse rotation with a detection and control system that uses torque sensing to dynamically determine the appropriate reverse rotation amount. This substitution of mechanical feedback with sensing and control technology enables precise control that maintains both metering efficiency and injection stability.
3Ease of operation
If fixed reverse rotation amount is used according to conventional techniques, then the control simplicity is maintained, but the resin injection amount becomes unstable due to varying resin viscosity and conditions
Solution Approach 1:
The patent introduces torque detecting means that provides feedback on actual operating conditions during screw forward movement. The control system uses this feedback to automatically adjust the reverse rotation amount, eliminating the need for manual adjustment while maintaining control simplicity. This feedback-based automatic control ensures consistent resin injection amounts despite variations in resin viscosity and molding conditions.
Solution Approach 2:
The system performs self-adjustment by using the torque detection information to automatically determine the appropriate reverse rotation amount. The control system serves itself by adapting to changing conditions without external intervention, maintaining both operational simplicity and injection consistency through automatic adaptation to varying resin properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The machine reliably closes the check ring, minimizing resin instability and metering time, and allows for precise display of necessary reverse rotation for operator guidance.
Implementation Method 1
torque detecting means for detecting torque acting on the screw during forward movement of the screw
Data Source
AI summary
When a screw equipped with a check ring is moved forward, torque acting on the screw is detected, and whether the check ring is closed is determined on the basis of the detected torque. The screw is rotated in reverse when the check ring is determined not to be closed, and the reverse rotation of the screw is stopped when the check ring is determined to be closed. The reverse rotation of the screw is thereby controlled so that the screw is rotated in reverse by an optimal amount for reliably closing the check ring.