Journal of Textile Research ›› 2025, Vol. 46 ›› Issue (01): 179-186.doi: 10.13475/j.fzxb.20230906201

• Machinery & Equipment • Previous Articles     Next Articles

Modeling and simulation of contact collision dynamics for nipper mechanism in comber

CHANG Boyan1,2(), HAN Fangxiao1, ZHOU Yang1, GUAN Xin1   

  1. 1. School of Mechanical Engineering, Tiangong University, Tianjin 300387, China
    2. Tianjin Key Laboratory of Advanced Mechatronics Equipment Technology, Tiangong University, Tianjin 300387, China
  • Received:2023-09-28 Revised:2024-08-06 Online:2025-01-15 Published:2025-01-15

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Abstract:

Objective High speed, high yield and high quality are the development goals of the new generation of domestic combing machines. However, the main problem of the current combing machine is that the impact generated by the nipper mechanism during operation seriously limits the improvement of the combing machine speed. The dynamic research to solve problem is of great significance to improve the stability of the nipper mechanism and promote the high speed of the comber.

Method The mid-fulcrum nipper mechanism was taken as the research object. Based on the contact collision theory, two calculation models for the instantaneous contact force of the nipper mechanism during contact and separation were established. Combined with the Lagrange equation, the contact collision dynamic modeling of the nipper mechanism was carried out. The dynamic model was then simulated using MatLab, and the correctness and effectiveness of the model were verified by three-dimensional virtual prototype simulation. Finally, the influence of the working parameters of the nipper mechanism and the stiffness of the pressure spring on the contact motion and the contact stress was analyzed.

Results The results showed that the rebound amount and rebound time of the jaw and the steeve of the comber nipper mechanism both increased as the main shaft speed went higher, and that the maximum contact stress increased with the increase of the main shaft speed, and decreased with the increase of the contact times. The maximum contact stress was much larger than the stable contact stress. Therefore, for the high-speed comber, the material and heat treatment methods should be considered to avoid the damage caused by the maximum stress exceeding the allowable value. The rebound amount and rebound time of jaw and steeve of the comber nipper mechanism demonstrated a decrease as the spring stiffness became higher. The stable contact stress would increase with the increase of the spring stiffness, and the maximum stress remained stable.

Conclusion The contact force calculation model of the jaw and the steeve of the comber nipper mechanism and the contact collision dynamic model of the nipper mechanism are established, and the numerical simulation is carried out. The correctness and effectiveness of the established contact dynamic model are verified by virtual prototype simulation. The influence of different working condition parameters and spring stiffness of the nipper mechanism on contact motion and contact stress is analyzed by numerical simulation. The conclusions can provide a theoretical basis for further increasing the speed of high-efficiency comber.

Key words: comber, nipper mechanism, contact force, Lagrange equation, dynamic

CLC Number: 

  • TH112

Fig.1

Diagram of nipper mechanism"

Fig.2

Working diagrams of nipper pressure mechanism. (a) Stage of nipper separation; (b) Moment of nipper closure; (c) Stage of nipper closure"

Fig.3

Diagram of nipper pressure mechanism"

Tab.1

Parameters of nipper mechanism"

仿真参数 数值 仿真参数 数值
L4/m 0.082 β2/rad 1.021
L5/m 0.187 β3/rad 1.158
L6/m 0.074 Jv1 0.29
L7/m 0.009 Jv2 0.29
L9/m 0.072 Sv1 0.37
L11/m 0.087 Sv2 0.37
L12/m 0.029 JE1/ (N·m-2) 2.05×1011
LEG/m 0.085 JE2/ (N·m-2) 2.05×1011
LCE/m 0.075 SE1/ (N·m-2) 1.05×1011
L O 1 O 3/m 0.220 SE2/(N·m-2) 1.05×1011
R1/m 0.029 τmax 0.051 5
R2/m 0.025 A/m2 1.97×10-4
β1/rad 0.012

Fig.4

Curves of jaw angular displacemens at different rutation speeds"

Fig.5

Curves of FH linear displacements at different rutation speeds"

Fig.6

Jaw angular velocity at different rotation speeds"

Fig.7

Curves of contact force with deformation at different rotation speeds. (a) Jaw contact force; (b) Steeve contact force"

Fig.8

Curves of contact stress with deformation at different rotation speeds. (a) Jaw contact stress; (b) Steeve contact stress"

Fig.9

Curves of rebound amount (a) and rebound time (b) with spring stiffness coefficient"

Tab.2

Influence of spring stiffnesses on contact stress"

弹簧刚度系数
k / (N·mm-1)		 最大接触应力/MPa 稳定接触应力/MPa
钳口 牵吊杆 钳口 牵吊杆
7 308.67 179.86 10.36 0.60
8 308.68 179.94 10.65 0.70
9 308.69 180.02 11.18 0.78
10 308.71 180.10 11.71 0.86
11 308.72 180.18 12.16 0.99
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