Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (09): 180-185.doi: 10.13475/j.fzxb.20180904106

• Machinery & Accessories • Previous Articles     Next Articles

Magnetic driving design and modeling for knitting needles of computerized flat knitting machine

ZHANG Chengjun1,2(), YOU Liangfeng1, ZUO Xiaoyan1,2, ZHANG Chi1,2, ZHU Li1,2   

  1. 1. School of Mechanical Engineering and Automation, Wuhan Textile University, Wuhan, Hubei 430073, China
    2. Hubei Key Laboratory of Digital Textile Equipment, Wuhan, Hubei 430073, China
  • Received:2018-09-17 Revised:2019-06-04 Online:2019-09-15 Published:2019-09-23

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Abstract:

In order to reduce heat, vibration and needle breakage during knitting process of computerized flat knitting machine, a non-contact needles driving method that permanent magnet knitting needles were driven by electromagnet array was proposed. At the same time, a new type of magnetic drive flat knitting machine structure with separate needle and drive was designed. By equivalent the elements of iron core, permanent magnet and air gap in the electromagnet array to magnetoresistance and magnetic potential, the equivalent magnetic circuit model of permanent magnet knitting needle driven by electromagnetic array was established. Then, by analyzing the flux of the equivalent magnetic circuit model of the electromagnet array moving horizontally to and fro, the magnetic force model of the permanent magnet knitting needle under different displacements of the electromagnet array was deduced. Thus, the force values of knitting needles under different conditions can be calculated. Maxwell electromagnetic simulation software was adopted to simulate the magnetic drive model, the data of the equivalent magnetic circuit model and the simulation model were compared and analyzed, and the validity of the equivalent magnetic circuit model was verified.

Key words: flat knitting machine, permanent magnetic needle, electromagnetic driving, magnetic equivalent circuit method, Maxwell simulation

CLC Number: 

  • TP311

Fig.1

Diagram of magnetic driving structure for knitting needles"

Fig.2

Diagram of magnetic driving action for knitting needles. (a) No.1 needle rises to tuck position;(b) No.1 needle rises to stitch transfer position; (c) No.1 needle returns to float position"

Fig.3

Dimension of magnetic driving structure for knitting needles"

Fig.4

Magnetic circuit analysis model. (a) Alignment of permanent magnet knitting needles with electromagnet; (b) Relative displacement between permanent magnet knitting needles and electromagnet"

Fig.5

Small displacement magnetic equivalent circuit model"

Fig.6

Large displacement magnetic equivalent circuit model"

Fig.7

Force diagram of permanent magnet knitting needle"

Fig.8

Dimension parameter of magnetic driving model"

Fig.9

Maxwell 3D magnetic array model"

Fig.10

Data comparison between magnetic circuit model data and Maxwell simulation"

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