Compression Caterpillar Tension Control for Buffer Tube Length Matching
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Solution Overview
Problem
In optical fiber cable production, the contraction of buffer tubes relative to optical fibers during extrusion leads to excess fiber length, causing signal attenuation.
Innovation Solution
A method and system using a compression caterpillar with adjustable drive belt gap to control tension on the buffer tube, ensuring it matches the optical fiber length by continuously measuring and adjusting the tension.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the buffer tube is extruded around the optical fibers without tension control, then the extrusion process is simple, but the buffer tube contracts excessively during cooling causing too much excess fiber length
Solution Approach 1:
The compression caterpillar applies tension to the buffer tube during extrusion before cooling contraction occurs. This preliminary action compensates for the expected thermal contraction, ensuring the final buffer tube length matches the optical fiber length after cooling, thereby resolving the length control issue without requiring complex post-processing.
Solution Approach 2:
The system dynamically adjusts the tension parameter applied to the buffer tube by controlling the compression caterpillar's drive belt gap and speed. By changing the tension parameter in real-time during extrusion, the system compensates for thermal contraction effects and achieves precise length control.
2Manufacturing precision
If the drive belt gap is frequently adjusted to maintain tension, then the tension control precision improves, but the operational complexity and time increase
Solution Approach 1:
The system incorporates tension sensors that continuously monitor the buffer tube tension during extrusion. This feedback is fed to the controller, which automatically adjusts the drive belt gap to maintain optimal tension, eliminating the need for manual adjustments and reducing operational time while maintaining precision.
Solution Approach 2:
The compression caterpillar system performs self-adjustment of the drive belt gap based on real-time tension feedback. The automated control system serves itself by detecting tension deviations and correcting them without external intervention, thereby maintaining tension consistency while minimizing time loss.
3Reliability
If the buffer tube tension is not controlled during extrusion, then the production speed is high, but the excess fiber length causes signal attenuation
Solution Approach 1:
The system applies the necessary tension to the buffer tube during extrusion as a preliminary action, ensuring that the buffer tube length is pre-compensated for thermal contraction. This allows high-speed extrusion without compromising the final length accuracy, thereby maintaining both productivity and signal transmission quality.
Solution Approach 2:
The controller dynamically adjusts the tension parameter during extrusion by modifying the drive belt gap and speed. This real-time parameter adjustment ensures that the buffer tube maintains appropriate tension throughout the process, preventing excess fiber length and signal attenuation while sustaining high production speeds.
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 approach maintains consistent tension on the buffer tube, reducing excess fiber length and signal attenuation, while minimizing manual adjustments and reducing scrap production.
Implementation Method 1
A speed of and a gap between drive belts of the compression caterpillar are set to achieve a desired tension on the buffer tube
Implementation Method 2
the buffer tube is a molten polymer material, and such polymer materials may undergo significant contraction during cooling
Data Source
AI summary
Embodiments of the disclosure relate to a method of controlling tension on a buffer tube produced on a buffer tube processing line. In the method, the buffer tube is directed through a compression caterpillar. A speed of and a gap between drive belts of the compression caterpillar are set to achieve a desired tension on the buffer tube. Tension on the buffer tube is measured as the buffer tube passes between the drive belts. It is determined whether the measured tension on the buffer tube is within an acceptable range, and the gap between the drive belts is decreased in increments while the buffer tube passes between the drive belts until the tension is within the acceptable range.