Centrifugal Preform Aligner with Active Ejection
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Solution Overview
Problem
Existing preform alignment and straightening devices in the manufacturing of thermoplastic containers, such as PET bottles, often result in misaligned or nested preforms causing traffic jams and manual intervention, as they fail to actively sort and eject unaligned preforms from the production line efficiently.
Innovation Solution
A centrifuge-based device with a horizontal circular plate rotating around a vertical axis, featuring a fixed peripheral guardrail, angular sectors for alignment and straightening, and sorting mechanisms including paddle wheels and deflectors to actively redirect misaligned preforms back to the alignment sector, ensuring correct alignment and straightening of preforms before they reach the forming station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a centrifuge bowl with alignment sector and straightening sector is used, then preforms are aligned and straightened in single file, but misaligned or nested preforms cause traffic jams and require manual intervention
Solution Approach 1:
The patent extracts misaligned and nested preforms from the main flow by introducing a sorting sector with ejector elements. These defective preforms are actively removed and redirected back to the alignment sector, preventing them from causing traffic jams and manual intervention in the straightening sector, thus maintaining continuous operation and productivity
Solution Approach 2:
The sorting sector acts as an intermediary between the alignment sector and the straightening sector. It receives preforms from the alignment sector, sorts out misaligned ones, and only passes correctly aligned preforms to the straightening sector, ensuring smooth continuous operation
2Manufacturing precision
If sorting means are arranged upstream of straightening point, then misaligned preforms are sorted, but they are not actively evicted and can become blocked across the line of correctly aligned preforms
Solution Approach 1:
The patent introduces dynamic ejector elements (rotating paddles or oscillating arms) in the sorting sector that actively move to strike and redirect misaligned preforms. This dynamic action ensures positive ejection of defective preforms without requiring complex static mechanical structures, maintaining alignment precision while controlling device complexity
Solution Approach 2:
The ejector elements operate periodically, rotating or oscillating to strike misaligned preforms at appropriate intervals. This periodic action efficiently sorts preforms without requiring continuous complex mechanical intervention, balancing alignment precision with manageable device complexity
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 device effectively aligns and straightens preforms in a single file, preventing traffic jams and manual intervention by actively sorting out misaligned preforms, thereby increasing production efficiency and reducing bottlenecks in the manufacturing process.
Implementation Method 1
The preforms are then projected by centrifugal force against a peripheral guardrail
Implementation Method 2
the body hanging from the exterior of the bowl through said gap
Data Source
Figure 1~3
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Figure 14~15
AI summary
The invention relates to a device (10) for aligning preforms (12) in a row and righting same, said device (10) comprising a bowl centrifuge (20) formed by: a horizontal circular platen (24) rotating about a vertical axis (B); a fixed peripheral rail (28); at least a first angular sector (20A) for aligning the preforms (12) against the rail (28); and at least a second angular sector (20B) for righting the preforms (12). The device is characterised in that it comprises means for actively ejecting incorrectly aligned preforms (12N) from the row of correctly aligned and righted preforms (12).