Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (12): 167-172.doi: 10.13475/j.fzxb.20210501006

• Machinery & Accessories • Previous Articles     Next Articles

Detection method and dynamic characteristics of weft yarn delivery

PENG Laihu1(), ZHANG Yujuan1, LÜ Yongfa2, DAI Ning1, LI Jianqiang3   

  1. 1. The Center for Engineering Technology of Modern Textile Machinery & Technology of Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. Zhejiang Rifa Textile Machinery Technology Co., Ltd., Shaoxing, Zhejiang 312500, China
    3. Research Institute of Zhejiang Sci-Tech University in Longgang, Wenzhou, Zhejiang 325000, China
  • Received:2021-05-07 Revised:2022-04-20 Online:2022-12-15 Published:2023-01-06

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Abstract:

Aiming at the problem that the tension and count regularity of yarn are difficult to be dynamically detected, which may lead to abnormal weft knitting, a photoelectric sensor-based non-contact yarn delivery state detection method was developed, and a binocular photoelectric sensor differential measurement was proposed. Dual-channel photoelectric components were innovatively designed to construct two-channel yarn dynamic sensing differential signal pairs to eliminate common-mode signal interference in order to pick up the weak yarn state signals by eliminating the influence of noise. On this basis, the yarn delivery state detection experiment was designed to test the real-time voltage signal when the yarn was delivered under different tensions and with different diameters, to analyze the signal average value, variance and numerical frequency distribution curve, and to reveal the dynamic characteristics of the yarn. The results show that as the yarn tension increases, the average value and variance of the difference signal gradually decrease, indicating that the yarn fluctuation amplitude is gradually decreasing, and the overall yarn fluctuation tends to be stable. Changing the yarn thickness will cause the yarn fluctuating amplitude to increases gradually, and the yarn fluctuation difference to gradually increase. When the yarn thickness increases to a certain value, the yarn fluctuation amplitude and the yarn fluctuation difference tend to be stable.

Key words: yarn delivery, voltage signal, yarn tension, photoelectric sensor, frequency distribution, weft knitting machine

CLC Number: 

  • TS184.1

Fig.1

Schematic diagram of yarn feeding on knitting machine"

Fig.2

Schematic diagram of yarn status in induction zone. (a) Yarn in static; (b) Yarn in motion"

Fig.3

Waveform diagram of IN1 and IN2 output. (a) Yarn in static; (b) Yarn in motion"

Fig.4

Signal detection circuit"

Fig.5

Experiment platform"

Fig.6

Threshold voltage curve at normal work of yarn"

Fig.7

Evaluation index of yarn jitter at different speeds. (a) Average; (b)Variance"

Fig.8

Frequency distribution curve of yarn signal voltage under different tension"

Fig.9

Evaluation index of yarn jitter of different thickness. (a)Average; (b)Variance"

Fig.10

Frequency distribution curve of voltage signal in different thickness yarns"

Fig.11

Analysis of voltage signals of different tensions in different thicknesses yearns"

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