精梳机钳板机构接触碰撞动力学建模与仿真

doi:10.13475/j.fzxb.20230906201

摘要/Abstract

摘要： 高速、高产、优质是新一代国产棉纺精梳机的发展目标,而当前精梳机存在的主要问题之一是高速运行时钳板机构产生的冲击严重限制了精梳机转速的提升,针对该问题进行动力学研究以提升钳板机构稳定性,达到推进精梳机高速化的目的。首先,以中支点式钳板机构为研究对象,基于接触碰撞理论建立钳板在接触和分离瞬时的冲击力计算模型,结合Lagrange方程对钳板机构进行接触碰撞动力学建模。其次,运用MatLab对所建动力学模型进行数值计算仿真,结合三维虚拟样机仿真验证模型的正确性和有效性。最后,分析钳板机构工况参数和加压弹簧刚度对冲击运动和冲击接触应力的影响规律。结果表明:钳口与牵吊杆处的最大接触应力远大于稳定接触应力,且回弹量和回弹时间会随锡林轴转速的提高而增大,随加压弹簧刚度的增大而减小。

关键词: 精梳机, 钳板机构, 接触碰撞力, Lagrange方程, 动力学

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

中图分类号:

TH112

畅博彦, 韩芳孝, 周杨, 关鑫. 精梳机钳板机构接触碰撞动力学建模与仿真[J]. 纺织学报, 2025, 46(01): 179-186.

CHANG Boyan, HAN Fangxiao, ZHOU Yang, GUAN Xin. Modeling and simulation of contact collision dynamics for nipper mechanism in comber[J]. Journal of Textile Research, 2025, 46(01): 179-186.

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链接本文: http://www.fzxb.org.cn/CN/10.13475/j.fzxb.20230906201

http://www.fzxb.org.cn/CN/Y2025/V46/I01/179

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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
L_EG/m	0.085	^JE₂/ (N·m^-2)	2.05×10¹¹
L_CE/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	τ_max	0.051 5
R₂/m	0.025	A/m²	1.97×10^-4
β₁/rad	0.012

弹簧刚度系数 k / (N·mm^-1)	最大接触应力/MPa		稳定接触应力/MPa
弹簧刚度系数 k / (N·mm^-1)	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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