Valve Pin Coupling for Injection Molding Force Management
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Solution Overview
Problem
Injection molding apparatuses face issues with valve pin damage due to improper operation, such as collisions with contaminants or frozen material, and the need for time-consuming and costly replacement or manual disengagement when components wear or fail.
Innovation Solution
The implementation of a spring-magnet coupling system that attaches to the valve pin, allowing for dampening of stopping forces and decoupling to prevent damage by limiting or preventing continued movement when a stopping force is encountered, enabling the system to mitigate potential damage while allowing unaffected valve pins to continue operating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a common valve pin plate actuates multiple valve pins in unison, then operational efficiency is improved, but the risk of damage increases when a single valve pin encounters a blockage
Solution Approach 1:
The coupling plate is segmented into individual coupling elements, each independently coupled to a specific valve pin. This segmentation allows each valve pin to be independently decoupled from the coupling plate when encountering a blockage, preventing damage while maintaining the ability to actuate multiple pins simultaneously during normal operation.
Solution Approach 2:
The magnetic coupling strength is designed to be variable through parameter changes in the magnetic assemblies. When a valve pin encounters resistance, the magnetic coupling force can be adjusted or reduced to allow decoupling, while during normal operation the stronger magnetic field maintains synchronized actuation of all valve pins.
2Reliability
If manual disengagement or replacement of damaged valve pins is performed, then component reliability is maintained, but downtime and costs increase
Solution Approach 1:
The magnetic coupling system enables automatic self-service functionality. When a valve pin encounters a blockage or malfunction, the magnetic coupling automatically decouples, allowing the problematic pin to be independently replaced without manual disengagement of the entire coupling plate or affecting other operational pins.
Solution Approach 2:
The coupling system transitions from a static rigid connection to a dynamic magnetic coupling that can automatically engage and disengage. This dynamic特性 allows the system to adapt to operational conditions, automatically separating damaged pins while maintaining connection with functional pins, thereby reducing downtime.
3Manufacturing precision
If rigid coupling is used to ensure synchronized valve pin movement, then positioning precision is improved, but the risk of force transmission to blocked pins increases
Solution Approach 1:
The magnetic coupling acts as an intermediary between the actuator and the valve pins. It provides sufficient coupling force to maintain synchronized movement and positioning precision during normal operation, but can automatically decouple when excessive force is detected, preventing harmful force transmission to blocked pins.
Solution Approach 2:
The magnetic coupling system incorporates a cushioning effect by design, where the magnetic field can be optimized to provide a gradual transition zone. This allows the system to absorb sudden force spikes before they reach the valve pins, preventing damage while maintaining synchronization.
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 spring-magnet coupling system effectively reduces the risk of damage to valve pins and surrounding components by absorbing or decoupling from stopping forces, thereby minimizing downtime and maintenance costs by allowing the system to continue operating with reduced damage and increased efficiency.
Implementation Method 1
either a spring of the spring coupling is positioned for dampening the stopping force encountered by the valve pin
Implementation Method 2
the magnetic coupling, which is magnetically coupled to the actuated part and/or the valve pin, decouples from the actuated part or the valve pin
Data Source
AI summary
An injection molding apparatus is disclosed having an actuated part that is movable in forward and rearward directions with a coupling part attached thereto having a spring coupling and a magnetic coupling. A valve pin for opening and closing a mold gate is coupled to the coupling part to be movable with the actuated part. When the actuated part is moved and the valve pin experiences a stopping force, either a spring of the spring coupling is positioned for dampening the stopping force encountered by the valve pin or the magnetic coupling, which is magnetically coupled to the actuated part and/or the valve pin, decouples from the actuated part or the valve pin to limit or prevent continued movement of the valve pin with the actuated part.