Journal of Textile Research ›› 2018, Vol. 39 ›› Issue (09): 160-168.doi: 10.13475/j.fzxb.20171104709

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Dynamic analysis and optimization of rotary dobby lifting comprehensive mechanism

  

  • Received:2017-11-24 Revised:2018-06-06 Online:2018-09-15 Published:2018-09-12

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Abstract:

In order to improve the overall performance of the lifting comprehensive mecanism, the dynamic characteristics were deeply studied. Firstly, based on the analytical design theory of the cam mechanism and the requirement of the loom shedding process, the cam profile of the rotary dobby lifting mechanism was designed. On this basis, the kinematic model was established. The dynamic model of the mechanism was established by using the Lagrange equation. Secondly, the virtual prototype of this mechanism was established in automatic dynamic analysis of mechanical sysems (ADAMS) , and the the drive torque for large disk by MatLab and ADAMS were compared and analyzed to test the correctness and validity of the proposed dynamic model. Finally, based on the constructed dynamic model, the influence of rotating speed of the big disk, the material and the movement distance of the heald frame, the theoretical profile of the heald cam on the driving torque of the large disk were simulated and optimized, respectively. The results show that reducing the mass and movement distance of heald frame, using a cam profile of the lifting comprehensive mechanism with five modified constant speed motion laws can reduce the fluctuation quantity of the driving torque for the large disk and improve the whole dynamic performance of the lifting comprehensive mechanism.

Key words: lifting comprehensive mechanism, camprofile, Lagrange equation, dynamics

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