Warp Knitting Tool Bar Vibration Absorber
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Solution Overview
Problem
Warp knitting machines face challenges in achieving high productivity due to vibration issues in knitting tool bars, which can lead to tool collisions and suboptimal fabric quality, limited by resonant frequencies that restrict operating speeds.
Innovation Solution
Incorporating a passive absorber arrangement tuned to the resonant frequency of the knitting tool bar, comprising a spring-mass system with adjustable properties to dampen and shift vibrations, allowing operation beyond critical speed ranges without damaging the machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the knitting tool bar is made longer to increase working width, then productivity is improved, but vibration and resonance occur at lower speeds
Solution Approach 1:
A passive absorber arrangement is introduced as an intermediary element between the knitting tool bar and the machine frame. This absorber arrangement, comprising a mass element connected to the bar via a spring device, mediates the vibration transmission by absorbing resonant vibrations and preventing them from propagating through the bar, thus allowing longer bars to operate stably at high speeds
2Productivity
If the operating speed is increased to improve productivity, then more rows of stitches are produced per unit time, but resonant vibrations are excited that can damage the machine
Solution Approach 1:
The passive absorber arrangement converts the harmful resonant vibrations into beneficial damping effects. By tuning the natural frequency of the absorber arrangement to match the resonant frequency of the knitting tool bar, the system transforms potentially damaging vibrations into controlled oscillations that are dissipated by the spring device, allowing the machine to safely operate through previously critical speed ranges
3Speed
If the knitting tool bar is made lighter to reduce inertia, then acceleration and deceleration are improved, but the bar becomes more susceptible to vibrations
Solution Approach 1:
The passive absorber arrangement modifies the dynamic parameters of the knitting tool bar system. By adding a mass-spring system with specific natural frequency characteristics, the overall vibrational behavior of the bar is changed. The absorber arrangement creates anti-resonance conditions that reduce vibration amplitudes at critical frequencies, allowing lightweight bars to maintain both low inertia and high vibration resistance
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 absorber arrangement effectively reduces vibration amplitudes and shifts resonant frequencies, enabling higher operating speeds and preventing tool collisions, thus enhancing productivity and fabric quality.
Implementation Method 1
the absorber arrangement absorbs the vibrations that form in the resonance frequency by damping and/or shifting the frequency or at least reducing their amplitude
Implementation Method 2
the absorber arrangement is tuned to a resonant frequency of the body or of the body with supports
Implementation Method 3
the absorber arrangement has at least one mass element which is in operative connection with a spring device which is connected to the body
Data Source
AI summary
Illustrates the looping tool guide bar (1) having, along a longitudinal direction, the extending body (2), said body having an annular tool receiving portion (3). It is intended to utilize such looping tool guide bar can achieve a high operating speed. For this purpose, the body (2) has a vibration absorber device.