Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (08): 167-175.doi: 10.13475/j.fzxb.20201002109

• Machinery & Accessories • Previous Articles     Next Articles

Detection technology for electromagnetic needle selection based on piezoelectric adhesive assembly

WANG Luojun1(), PENG Laihu2,3, SHI Weimin2,3, ZHANG Weizhong1   

  1. 1. Zhejiang Institute of Mechanical & Electrical Engineering, Hangzhou, Zhejiang 310051, China
    2. The Center for Engineering Technology of Modern Textile Machinery & Technology of Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    3. Key Laboratory of Modern Textile Machinery & Technology of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
  • Received:2020-10-10 Revised:2022-03-19 Online:2022-08-15 Published:2022-08-24

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Abstract:

Aiming at the distortion of cloth pattern caused by electromagnetic needle selector in jacquard knitting machine and high level defects, a signal detection scheme for needle selection based on a piezoelectric adhesive assembly is proposed. The detection experiment of vibration characteristics of the baffle of needle selector was designed, the signal characteristics of the forced vibration of the baffle was analyzed, and the feasibility of using the impact force signal of the forced baffle vibration was verified as the key data for detecting whether the action of the needle selection is effective. The piezoelectric adhesive assembly was prepared through experiments to sense the strain of micro-force of the baffle to facilitate the detection of the impact force signal associated to the needle selection. Based on the analysis of the frequency spectrum of the designed piezoelectric adhesive assembly, electrical modeling was carried out, the detection circuit of vibrating signal was designed, and a semi-closed loop control strategy of electromagnetic needle selection based on the feedback mechanism of signal detection of the vibration was proposed, which helps achieve the real-time monitoring and effectiveness feedback for the jacquard action of the needle selector under the on-site working conditions. This work provides a technical solution for reducing the defective rate of fabrics in the jacquard operation.

Key words: knitting machine, piezoelectric ceramic, electromagnetic needle selector, piezoelectric adhesive assembly, laser vibration measurement

CLC Number: 

  • TS103.7

Fig.1

Schematic diagram of drive module of electromagnetic needle selector. (a) Driving component; (b) Tool head model of electromagnetic needle selector; (c) Uniform magnetization of ferromagnetism (macro);(d) Sketch of needle selection mechanism"

Fig.2

Experimental platform of baffle vibration detection. (a) Architecture of experimental platform; (b) Schematic of laser point"

Fig.3

Schematic diagram of characteristic of baffle vibration detection"

Tab.1

Vibration displacement and velocity peak of baffle (downward movement)"

驱动电压/V Vmax/(mm·s–1) Xmax/(10–5 mm)
28 0.431 9 12
26 0.372 5 10
24 0.376 9 11
22 0.313 6 8
20 0.226 7 6
18 0.163 1 4.5

Fig.4

Schematic diagram of key steps and physical model of piezoelectric adhesive assembly. (a) Fixed a position by means of hinges before fusing; (b) Hierarchical diagram of bonding process; (c) Physical structure model of adhesive body"

Fig.5

Conductivity graph of piezoelectric adhesive assembly (end product)"

Fig.6

Fitting curve of equivalent circuit model of piezoelectric adhesive assembly. (a) Finished product and its equivalent circuit model; (b)Ungraded product and its equivalent circuit model"

Fig.7

Schematic diagram of waveform of output voltage of piezoelectric adhesive assembly. (a) Part of complete waveform of output voltage; (b) Output voltage waveform when head swings upward; (c) Output voltage waveform when head swings downward"

Tab.2

Average value of output voltage signal peaks of piezoelectric adhesive assembly"

驱动电压/V 摆击方向 输出信号波峰均值/V
28 向上摆击 0.468 429
向下摆击 0.583 491
26 向上摆击 0.378 945
向下摆击 0.525 889
24 向上摆击 0.274 861
向下摆击 0.478 564
22 向上摆击 0.221 564
向下摆击 0.451 894
20 向上摆击 0.190 332
向下摆击 0.432 151
18 向上摆击 无明显波形
向下摆击 0.345 168

Fig.8

Frequency spectra of output signal of piezoelectric adhesive assembly under different driving voltages. (a) 28 V(up); (b) 28 V(down); (c) 26 V (down); (d) 24 V(down)"

Fig.9

Schematic diagram of signal detection circuit. (a) Charge amplifier module; (b) Supplementary module for actual circuit design"

Fig.10

Program architecture and fault tolerance mechanism of vibration signal detection. (a) Fault-tolerant mechanism of vibration detection; (b) Architecture of vibration detection program"

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