Warp Knitting Roller Vibration Damping for Wider High-Speed Operation
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Solution Overview
Problem
Warp knitting machines face challenges in combining higher working speeds and larger working widths due to increased vibration issues, which affect the quality of the knitted fabric and make maintenance difficult, as the rollers become more sensitive to vibrations.
Innovation Solution
A vibration absorber arrangement is integrated into the rollers, comprising a mass arrangement connected via a spring to the roller tube, using passive, active, hybrid, or adaptive vibration absorbers to absorb vibrations, with a design that optimizes damping without additional installation space and maintains homogeneous mass distribution for effective vibration cancellation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the working width and operating speed of the warp knitting machine are increased, then productivity is improved, but vibrations increase and fabric quality deteriorates
Solution Approach 1:
The patent converts the harmful vibrations into beneficial damping forces by installing vibration damper assemblies within the roller cavities. These dampers contain mass elements connected via springs that resonate at frequencies matching the roller vibrations, thereby absorbing and dissipating the harmful vibrational energy while the machine operates at high speed and width for improved productivity
2Object-affected harmful factors
If the mass or rigidity of rollers is increased to reduce vibrations, then vibration damping is improved, but maintenance complexity increases
Solution Approach 1:
The patent segments the vibration damping function from the roller structure itself by installing separate, modular vibration damper assemblies within the roller cavities. This allows the dampers to be independently accessed, removed, and replaced without removing the entire roller or fabric take-up unit, thereby maintaining effective vibration damping while significantly improving maintenance ease
Solution Approach 2:
The vibration damper assemblies are nested within the hollow cavities of the rollers, utilizing the existing internal space. This nesting approach allows the addition of vibration damping functionality without increasing the external dimensions or mass of the rollers, avoiding the maintenance complications associated with heavier or more rigid roller designs
3Device complexity
If passive vibration dampers are used, then device complexity is reduced, but adaptability to different vibration frequencies decreases
Solution Approach 1:
The patent employs multiple passive vibration damper assemblies, each with differently tuned spring constants and mass elements designed to resonate at specific vibration frequencies. By selecting and installing dampers with appropriate parameters for different frequency ranges, the system achieves broad frequency adaptability while maintaining the simplicity of passive mechanical components without requiring external power or control systems
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 vibration absorber arrangement effectively reduces vibration amplitudes at nominal speeds, allowing for higher productivity and quality knitted fabrics while enabling larger working widths without compromising maintenance accessibility.
Implementation Method 1
the vibration of the roller tube is introduced directly into the vibration damper. The vibration is then transmitted via the spring arrangement to the mass assembly, which in turn vibrates, approximately in opposite phase to the excitation vibration
Implementation Method 2
the vibration damper comprises a mass assembly connected to the roller tube via a spring arrangement
Implementation Method 3
the mass assembly, which in turn vibrates, approximately in opposite phase to the excitation vibration, thereby extracting energy from the vibration of the roller tube
Implementation Method 4
Two new resonant frequencies are created, but these have a smaller amplitude
Data Source
Figure 1~3
AI summary
A warp knitting machine (1) with a knitting area (2) and a fabric take-off (3) is specified, which includes at least one roller (5-7). The aim is to provide a warp knitting machine with high productivity. For this purpose, the roller (5-7) is provided with a vibration damper arrangement.