Removable Hot Channel Inlet Unit for Injection Molding Tool Maintenance
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Solution Overview
Problem
The existing injection molding tools face issues with melt backflow during operation, leading to manufacturing problems and complex maintenance due to inaccessible seals and operating devices, resulting in prolonged downtimes during servicing or repair.
Innovation Solution
The injection molding tool design features a separate unit for the inlet part of the hot channel, with the closure needle and operating element accessible from the outside, allowing for easy maintenance and repair without disassembling the tool, and includes a heating element and temperature sensor for enhanced functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the closure element and operating device are disposed inside the injection molding tool, then the melt can be effectively controlled, but the seals and operating device become inaccessible for maintenance and repair
Solution Approach 1:
The injection molding tool is divided into a main body and a separate inlet unit that can be removed. The closure element and operating device are relocated to this separate inlet unit, which can be detached from the main tool body. This segmentation allows the critical components to be accessed, serviced, or replaced by simply removing the inlet unit, eliminating the need to disassemble the entire complex tool structure.
2Manufacturing precision
If the inlet part of the hot channel extends into the interior of the injection molding tool, then the melt distribution is improved, but the penetration seals and operating device require disassembly of the tool for servicing
Solution Approach 1:
The inlet unit containing the hot channel and closure mechanism is designed as a separable module. When servicing is required, the entire inlet unit can be removed as a single component, minimizing the disassembly time and allowing quick replacement or maintenance without working on the complex interior of the main tool body.
Solution Approach 2:
The problematic inlet unit with its penetration seals and operating device is extracted from the main tool body and made removable. This extraction allows the critical components to be accessed and serviced externally, eliminating the need to disassemble the tool to reach these components.
3Ease of operation
If the supply nozzle is removed from the injection molding tool during operation, then the manufactured parts can be removed, but melt backflow occurs causing manufacturing problems
Solution Approach 1:
The closure element is positioned to automatically close the inlet opening when the supply nozzle is removed or retracted. This preliminary closing action prevents melt backflow before it can cause manufacturing problems, allowing the supply nozzle to be safely removed for part removal operations.
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
This design reduces downtime by enabling rapid exchange and servicing of the separate unit, allowing continuous operation of the injection molding apparatus and facilitating early detection of seal defects through a leakage channel, thus minimizing operational disruptions.
Implementation Method 1
the separate unit (5) includes a heating element (7) for heating the melt in the separate unit (5)
Implementation Method 2
a temperature sensor (8) so that the temperature sensor (8) and the heating element (7) can be easily removed together with the separate unit (5)
Data Source
AI summary
In an injection molding tool including at least one hot channel nozzle to which a melt is supplied via a hot channel structure which at its end remote from the hot channel nozzle includes an inlet opening which can be closed by a closure element which is axially movably supported in the inlet part of the hot channel adjacent the inlet opening, the hot channel is angled and the closure element extends in sealed relationship through an angled wall area of the hot channel structure for actuating the closure member, the inlet area and an operating device for actuating the closure member being disposed in a separate unit removably connected to the injection molding tool.