Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (01): 154-161.doi: 10.13475/j.fzxb.20200403008

• Machinery & Accessories • Previous Articles     Next Articles

Reverse modeling and kinematics simulation of new weft insertion mechanism for rapier looms

YU Chennan1, JIA Jiangming1,2, CHEN Zhiwei1, CHEN Jianneng1,2(), CHEN Jiayou3, LU Wentao1   

  1. 1. Faculty of Mechanical Engineering & Automation, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. Key Laboratory of Transplanting Equipment and Technology of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou,Zhejiang 310018, China
    3. Fujian Jiayou Tea Machinery Intelligent Technologies Inc., Quanzhou, Fujian 362400, China
  • Received:2020-04-13 Revised:2020-10-04 Online:2021-01-15 Published:2021-01-21
  • Contact: CHEN Jianneng E-mail:jiannengchen@zstu.edu.cn

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Abstract:

To improve the design flexibility and motion performance of the weft insertion mechanism in the rapier looms, a new type of eccentric circular and non-circular planetary gear train weft insertion mechanism was presented in this paper. According to the work requirements of weft insertion mechanism, ideal rapier movement was put forward and a mathematical model for calculating the mechanism parameters from the characteristics of proposed weft insertion motion was established. The reverse design and simulation procedure of the weft insertion mechanism were compiled using MatLab, and the parameter optimization and motion simulation of the weft insertion mechanism were performed to obtain the most suitable mechanism parameters. A three-dimensional model of the weft insertion mechanism was established accordingly, and a virtual prototype kinematic simulation test was carried out using automatic dynamic analysis of mechanical systems (ADAMS). It was revealed that the kinematic curves of the rapier head based on the theoretical calculation and simulation are basically the same, which verifies the correctness of the modeling and analysis of the weft insertion mechanism.

Key words: weft insertion mechanism, planetary gear train, reverse modeling, kinematics simulation, rapier loom

CLC Number: 

  • TS103.1

Fig.1

Diagram of eccentric circular and non-circular planetary gear train weft insertion mechanism"

Fig.2

Weft insertion movement law"

Fig.3

Diagram of first stage eccentric circular and conjugate non-circular transmission"

Fig.4

Diagram of second stage non-circular planetary gear train transmission"

Fig.5

Diagram of software structure"

Fig.6

Software interface"

Fig.7

Comparison of non-circular gear pitch curves with different eccentricities"

Fig.8

Comparison of non-circular gear pitch curves with different amplified gear ratios"

Fig.9

Three-dimensional model of two-stage non-circular gears. (a) Model of the first stage non-circular gears; (b) Model of the second stage non-circular gears"

Fig.10

Three-dimensional diagram of the transmission part of eccentric circular and non-circular planetary gear train"

Fig.11

Comparison of theory and simulation movement law of weft insertion sword head. (a) Displacement of sword head; (b) Speed of sword head;(c) Acceleration of sword head"

Tab.1

Comparison of theoretical and simulated peak value of sword head movement law"

指标 smax/
m		 s·max/
(m·s-1)		 s·min/
(m·s-1)		 s¨max/
(m·s-2)		 s¨min/
(m·s-2)
理论值 1.40 25.78 -25.78 566.00 -610.48
仿真值 1.39 24.82 -23.31 555.18 -581.33
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