Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (12): 145-150.doi: 10.13475/j.fzxb.20210106306

• Machinery & Accessories • Previous Articles     Next Articles

Deformation and stress analysis on nippers of cotton combing machine

LIANG Zhuo1, JIA Guoxin2, REN Jiazhi1(), LI Jinjian1   

  1. 1. Zhongyuan University of Technology, Zhengzhou, Henan 450007, China
    2. Henan University of Engineering, Zhengzhou, Henan 450007, China
  • Received:2021-01-26 Revised:2021-09-23 Online:2021-12-15 Published:2021-12-29
  • Contact: REN Jiazhi E-mail:rjzhi@163.com

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Abstract:

In order to study the stress and deformation on the working state of the lower nipper in cotton spinning combers, and to analyze the kinetic of the nipper clamping process, mathematical models were established to describe the spring pressure, nipper clamping torque and nipper effective pressure, the deformation and stress of the lower nipper. Ansys finite element analysis software was used to simulate and analyze the stress and deformation of the lower nipper made from chromium alloy, aluminum alloy and titanium alloy. The results show that in the clamped state, the actual maximum stress of the lower nippers with the three different alloy materials is much smaller than its permittable stress, and that in the working state, the maximum deformation of the lower nipper using the three different alloy materials are 0.008 mm for titanium alloy, 0.010 3 mm for aluminum alloy, and 0.019 3 mm for chromium alloy. It is clear that when the titanium alloy lower nippers are used, the deformation of the lower nippers is minimal, which is beneficial to improve the gripping state of the upper and lower nippers and hence the quality of combing, and to reduce the loss of spinnable fibers.

Key words: combing machine, nipper, nipper clamping process, kinetic analysis, finite element analysis

CLC Number: 

  • TS112.2

Fig.1

Nipper mechanism"

Fig.2

Plane structure diagram of nipper pressure mechanism"

Fig.3

Spring pressure at closed jaws of nipper"

Tab.1

Results of various parameters of pressurizing mechanism"

分度 弹簧压缩
量/mm		 上钳板托架
夹角θk/(°)		 钳口压力/
N		 钳口有效
压力/N
36 3.5 66.21 491.05 426.72
38 5.3 64.56 513.38 440.48
40 6.2 63.13 539.68 449.50
2 6.1 61.52 534.48 457.11
4 5.5 60.34 527.82 435.75
6 4.4 59.54 511.41 418.84
8 2.8 58.53 488.38 395.58

Fig.4

Three-dimensional structure diagram of lower nipper"

Fig.5

Lower nipper cantilever model"

Fig.6

Lower clamp simply supported beam model"

Fig.7

Finite element model of nipper mechanism"

Tab.2

Nipper material properties"

材料名称 许用应力/
MPa		 密度/
(g·cm-3)		 弹性模量/
GPa		 泊松比
铬合金(1Cr13) 230 7.85 206 0.277
铝合金(2A11) 143 2.72 72 0.330
钛合金(TC4) 320 4.40 110 0.340

Fig.8

Stress cloud diagram of lower nippe made by different materials. (a) Chromium alloy; (b) Aluminum alloy;(c) Titanium alloy"

Fig.9

Deformation cloud map of lower nipper made by different materials. (a)Chromium alloy; (b) Aluminum alloy; (c) Titanium alloy"

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