Injection Molding Nozzle With Automatic Closure Needle Retraction
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Solution Overview
Problem
Existing injection molding nozzles require extensive adjustment to ensure closure needles extend sufficiently into the mold, leading to either grafting or scratching of the injection molding parts, and lack a mechanism for automatic retraction to prevent surface damage.
Innovation Solution
An injection molding nozzle with a closure element driven by a short stroke actuating mechanism that automatically retracts a predetermined distance after closing, ensuring the needle is slightly embedded during molding and fully retracted afterward, eliminating the need for precise adjustment and preventing surface damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the closure needle extends sufficiently far into the communication opening to seal properly, then sealing reliability is improved, but the risk of scratching the injection molding part surface increases
Solution Approach 1:
The closure needle is made dynamically adjustable through a drive mechanism that enables axial movement between retracted and extended positions. This allows the needle to dynamically adapt its position: extended during molding for sealing, retracted after molding to prevent scratching, thereby resolving the contradiction between sealing reliability and surface protection
Solution Approach 2:
The drive mechanism automatically extends the closure needle into the communication opening before the injection molding process begins, ensuring proper sealing is established in advance. This preliminary positioning eliminates the need for manual adjustment and prevents surface damage by controlling the needle's position timing
2Object-affected harmful factors
If the closure needle is retracted too far from the communication opening, then the risk of scratching the injection molding part surface is reduced, but grafting occurs at the gate mark
Solution Approach 1:
The drive mechanism enables precise dynamic control of the closure needle position, allowing it to extend sufficiently during molding to prevent grafting at the gate mark, then retract automatically after molding to prevent surface scratching. This dynamic positioning resolves the contradiction between gate mark quality and surface protection
Solution Approach 2:
The drive mechanism incorporates feedback control to automatically adjust the closure needle position based on the molding cycle phase. The needle is extended when molding is active to ensure proper sealing and gate mark quality, then retracted when molding completes to prevent surface damage, eliminating the need for manual adjustment
3Manufacturing precision
If manual adjustment of the closure needle position is performed to achieve precise positioning, then manufacturing precision is improved, but the complexity of operation increases
Solution Approach 1:
The drive mechanism enables the closure needle to automatically adjust its own position through axial movement controlled by the molding cycle. The system self-regulates the needle extension and retraction without requiring manual intervention, thereby achieving precise positioning while simplifying operation and eliminating time-consuming adjustment work
Solution Approach 2:
The manual mechanical adjustment system is replaced with an automated drive mechanism that uses controlled axial movement to position the closure needle. This substitution eliminates the need for manual operation while maintaining or improving positioning precision through automated control
4Reliability
If the closure needle is extended deeply into the communication opening to ensure sealing, then sealing reliability is improved, but the device complexity increases due to adjustment requirements
Solution Approach 1:
The closure needle is integrated with a drive mechanism that enables automatic axial movement between extended and retracted positions. This dynamic system ensures deep extension for reliable sealing during molding, then automatic retraction to prevent surface damage, achieving high reliability without complex manual adjustment mechanisms
Solution Approach 2:
The drive mechanism automatically positions the closure needle in the extended state before the injection molding process begins, ensuring proper sealing is established in advance. This preliminary automated positioning eliminates the need for complex manual adjustment mechanisms while maintaining sealing reliability
Data Source
AI summary
In an injection molding nozzle with a nozzle head including at least one discharge opening and a closure element for closing the discharge opening movably supported in the nozzle head for closing the discharge in order to control the supply of melt material to a communication opening in an injection mold, the closure element is operable by a drive mechanism provided with a short stroke actuating means for displacing the closure element in a direction opposite to the closing direction of the closure element by a predetermined short distance so as to automatically retract the closure element by the predetermined short distance when it is no longer biased by the actuating means in the closing direction.