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Comprehensive analysis of kinematic accuracy of rotary dobby heald lifting mechanism
Published:2023-02-15 author:ZHANG Gang, ZHAO Shi-hai, YUAN Ru-wang. Browse: 182 Check PDF documents

Comprehensive analysis of kinematic accuracy of rotary 
dobby heald lifting mechanism


ZHANG Gang, ZHAO Shi-hai, YUAN Ru-wang

(Tianjin Key Laboratory of Advanced Mechatronics Equipment Technology, 
Tiangong University, Tianjin 300387, China)


Abstract:  Aiming at the problems that the kinematic accuracy and working stability of the rotary dobby heald lifting mechanism need to be improved, the kinematic accuracy of the mechanism was modeled and simulated. Firstly, based on the working principle of the mechanism and combined with the continuous contact model, the motion accuracy error model of the rotary dobby heald lifting mechanism with dimensional error and kinematic pair clearance was established, which was made by conjugate cam transmission mechanism and plane fourbar mechanism in series. Then, numerical calculation and motion simulation were carried out by MATLAB, and the influence of conjugate cam transmission mechanism and plane fourbar mechanism on the motion accuracy of rotary dobby heald lifting mechanism was analyzed. Finally, the output accuracy of the rotary dobby heald lifting mechanism was improved by reducing the clearance value. The research results show that the motion deviation reaches the maximum near the extreme values of angular velocity and angular acceleration. The conjugate cam transmission mechanism has a greater impact on the output accuracy of the heald lifting mechanism than the plane fourbar mechanism, and the motion errors of the two mechanisms have a cumulative effect on the output accuracy. After the clearance of the kinematic pair is reduced by 0.02 mm, the maximum deviations of angular displacement, angular velocity and angular acceleration of the heald lifting armare reduced by 10.26%, 15.54% and 27.75% respectively. The research results canprovide a theoretical reference for the motion accuracy analysis of the rotary dobby heald lifting mechanism.

Key words: rotary dobby heald lifting mechanism; continuous contact model; mechanism output error; clearance of kinematic pair; conjugate cam speed change mechanism; planar fourbar mechanism; motion accuracy of heald lifting arm

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