Injection Head Radial Nozzle Adjustment Mechanism
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Solution Overview
Problem
Existing injection heads for producing twin-wall pipes with large nominal widths face significant challenges due to the heavy weight of components, requiring high force and complex designs for radial nozzle adjustments, leading to operational inefficiencies and sealing issues.
Innovation Solution
The internal and external nozzle adjustment devices are integrated directly into the nozzle casings, allowing for radial adjustment of the nozzle channels at the nozzle exit, reducing the force required for adjustment and ensuring reliable sealing through radial adjustment rings and screws, enabling easier fine-tuning without dismounting other parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If radial nozzle adjustment devices are arranged at the end disposed outside the moulding machine, then adjustment can be performed during operation, but the devices require very high expenditure of force and complicated design for large nominal widths
Solution Approach 1:
The adjustment device is moved from the external peripheral location to the internal region of the injection head, specifically to the melt channel wall adjacent to the nozzle. This spatial repositioning transforms the adjustment mechanism from an external peripheral device to an integrated internal component, reducing the lever arm and required adjustment force while maintaining operational accessibility
Solution Approach 2:
The adjustment device is nested within the injection head structure, with the adjustment element positioned inside the melt channel wall rather than externally. This nesting integrates the adjustment function into the existing injection head geometry, eliminating the need for separate external adjustment mechanisms and reducing overall device complexity
2Ease of operation
If heavy injection head components are moved along a relatively long path from outside, then radial nozzle adjustment can be achieved, but very high expenditure of force is required
Solution Approach 1:
The adjustment mechanism is repositioned from an external location requiring long-path movement to an internal location adjacent to the nozzle. This dimensional change in positioning reduces the adjustment path length and consequently the force required, as the adjustment element acts directly at the nozzle location rather than through a long mechanical linkage from outside
Solution Approach 2:
The adjustment function is extracted from the heavy external adjustment device and implemented as a separate, lightweight adjustment element positioned internally. This extraction allows the adjustment mechanism to be decoupled from the heavy injection head components, requiring minimal force to operate independently
Data Source
AI summary
An injection head for an apparatus for the production of twin-wall pipes has an external melt channel leading to an external nozzle and an internal melt channel leading to an internal nozzle. From the internal melt channel, a conically expanding internal nozzle channel leads to an internal nozzle outlet of the internal nozzle. In the region of the internal nozzle channel, an internal nozzle adjustment device is arranged by means of which the gap cross-section of the internal nozzle channel is displaceable and adjustable up to the internal nozzle outlet by radial displacement.