Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (01): 158-164.doi: 10.13475/j.fzxb.20181204307

• Machinery & Accessories • Previous Articles     Next Articles

Research on servo drive of detaching roller of cotton combing machines

LIU Lidong1,2, LI Xinrong1,2(), YANG Haipeng1,2, BU Zhaoning1,2   

  1. 1. School of Mechanical Engineering, Tiangong University, Tianjin 300387, China
    2. Key Laboratory of Modern Mechanical and Electrical Equipment Technology, Tianjin 300387, China
  • Received:2018-12-20 Revised:2019-06-05 Online:2020-01-15 Published:2020-01-14
  • Contact: LI Xinrong E-mail:lixinrong7505@hotmail.com

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Abstract:

Aiming at solving the problem of excessive driving power provided by the single servo motor equipped for detaching roller in the current versions of cotton comber, the use of dual motor with a one-way hybrid driving mechanism was proposed. Under the preposition that detaching roller provides the required motion, the concept of hybrid drives using parallel and biased differential gear trains was put forward after analyzing the power distribution in the hybrid driving mechanism. The dynamic performance of motor under different schemes was compared to by simulation analysis of virtual prototype. The results show that the speed and acceleration (absolute value) of the driving motor used in the hybrid drive mechanism is reduced by more than 30% compared to that of the single servo motor mechanism, leading to a significant improvement in dynamic performance of the motor. In addition, the design also enables the adjustment of machine speed according to different cotton processing parameters. This new design increases the flexibility of the mechanism, stimulating new ideas for research in high-efficiency combers.

Key words: combing machine, detaching roller, hybrid drive, differential gear train, unidirectional motor, power distribution

CLC Number: 

  • TS112.2

Fig.1

Angular velocity curve of separate roller"

Fig.2

Motion law of servo motor direct driving separation of roller motor"

Fig.3

Hybrid drive mechanism diagram"

Fig.4

Speed and acceleration curves of two motors (forward rotation of constant speed motor). (a) Corresponding speed curves; (b) Actual speed curves; (c) Actual acceleration curves"

Fig.5

Speed and acceleration crurves of two motors(negative rotation of constant speed motor). (a) Corresponding speed curves; (b) Actual speed curves; (c) Actual acceleration curves"

Fig.6

Two motor speed state chart of parallel hybrid drive detaching roller. (a) Speed curves;(b) Actual speed curves; (c) Actual acceleration curves"

Fig.7

Corresponding driving speed curves of two motors separated by positive and negative velocities"

Fig.8

Boundary conditions for piecewise polynomials"

Fig.9

Two motor speed state charts after parallel hybrid drive detaching roller optimization. (a) Speed curves;(b) Actual speed curves; (c) Actual acceleration curves"

Tab.1

Table of motor dynamic performance parameters of different schemes"

驱动方案 电动机 角速度/(rad·s-1) 角加速度/(rad·s-2)
最小值 最大值 平均值 最小值 最大值 平均值
伺服电动机直接驱动 电动机1 -494.9 280.7 19.62 -66 130 87 020 -180.8
电动机2 -494.9 280.7 19.62 -66 130 87 020 -180.8
并列型混合驱动 电动机1 20.36 94.04 45.16 -8 267 6 282 17.17
电动机2 -215.6 -0.019 83 -143 -24 320 18 480 50.52
偏列型混合驱动(I) 电动机1 -147.4 -0.013 56 -97.78 -16 520 12 550 34.32
电动机2 275.2 275.2 275.2 0 0 0
偏列型混合驱动(II) 电动机1 0.054 59 147.4 49.66 -16 520 12 550 34.32
电动机2 -156.2 -156.2 -156.2 0 0 0
并列型优化方案 电动机1 0 103.7 22.94 -12 230 12 650 34.26
电动机2 -156 0 -78.3 -13 850 3 805 0.173 9

Tab.2

Reduction value of dynamic performance parameters of motor in each scheme"

驱动
方案		 角速度
最大值/
(rad·s-1)		 角速度最大
值降幅/%		 角加速度
最大值/
(rad·s-2)		 角加速度
最大值
降幅/%
并列型混合驱动 215.6 56.4 24 320 72.1
偏列型混合驱动 156.2 68.4 16 520 81.0
并列型优化
混合驱动		 156 68.5 13 850 84.1

Fig.10

Three dimensional simulation diagram of hybrid driving mechanism"

Fig.11

Simulation speed curve of detaching roller of comber"

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