Spinning Unit Yarn Defect Detection Tension Stabilization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional spinning units face challenges in accurately detecting yarn defects due to unstable yarn paths and fluctuating tensions, which affect the detection accuracy of yarn defect detecting devices.
Innovation Solution
A spinning unit configuration that includes a draft device, spinning device, tension stabilizing device, and yarn defect detecting device, where the tension stabilizing device maintains appropriate tension and the yarn defect detecting device is positioned between the spinning and tension stabilizing devices to prevent path changes and tension fluctuations, using a roller member and unwinding member to adjust tension and a light-based system to measure yarn thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the yarn defect detecting device is arranged between the yarn feeding device and the winding device, then the device can detect yarn defects, but the yarn path changes due to winding device traversal causing unstable detection signals
Solution Approach 1:
A tension stabilizing device is introduced as an intermediary component between the yarn feeding device and the yarn defect detecting device. This mediator stabilizes the yarn path and tension, ensuring that the detection signals remain stable while maintaining the ability to detect yarn defects accurately.
Solution Approach 2:
The system is segmented into distinct functional zones: a first yarn path section for stable tension maintenance and defect detection, and a second yarn path section for winding operations. This segmentation isolates the detection system from the destabilizing effects of the winding device traversal.
2Reliability
If high tension is applied to the spun yarn between the yarn feeding device and the tension stabilizing device, then yarn feeding speed fluctuations are compensated, but yarn defect characteristics are hidden making detection difficult
Solution Approach 1:
The yarn path is divided into two tension zones: a first section with stable, appropriate tension for defect detection, and a second section where tension variations occur during winding. This segmentation allows each section to have optimized tension characteristics - the first section maintains low enough tension to preserve defect characteristics while the second section handles feeding stability.
Solution Approach 2:
Different tension characteristics are applied to different sections of the yarn path. The section between the tension stabilizing device and the winding device experiences variable tension appropriate for feeding stability, while the section between the spinning device and tension stabilizing device maintains stable, appropriate tension for defect detection.
3Productivity
If the friction roller rotational speed fluctuates or package rotational speed varies due to uneven friction force, then tension acting on the spun yarn changes suddenly causing yarn cut-off or characteristic changes
Solution Approach 1:
The tension stabilizing device incorporates feedback mechanisms that monitor yarn tension and adjust the yarn feeding speed accordingly. When tension deviations are detected due to friction roller or package speed fluctuations, the system automatically compensates by adjusting feeding parameters, maintaining stable tension and preventing yarn cut-off or characteristic changes.
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 configuration stabilizes yarn tension and path, enhancing the accuracy of yarn defect detection and improving the quality of the spun yarn by preventing hidden defects and fluctuations.
Implementation Method 1
using a light-based system to measure yarn thickness
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A spinning unit 1 includes a draft device 5, a spinning device 6, a tension stabilizing device 8, a winding device 9, and a yarn defect detecting device 7. The draft device 5 drafts a fiber bundle F. The spinning device 6 produce a spun yarn Y from the fiber bundle F drafted by the draft device 5. The tension stabilizing device 8 stabilizes tension of the spun yarn Y produced by the spinning device 6. The winding device 9 winds a package 91 of the spun yarn Y fed from the tension stabilizing device 8. The yarn defect detecting device 7 can detect a yarn defect in the spun yarn Y. The yarn defect detecting device 7 is arranged between the spinning device 6 and the tension stabilizing device 8.