| In the process of raw silk reeling, traverse mechanism is the core part of automatic silk reeling machine, whose role is to enable to make the silk yarn on the rotary drum to form a mesh wire sheet. At present, the common traverse mechanism mainly include: the type with double cylindrical cam, the type with epicyclic gear train and cylindrical cam, the type with epicyclic gear train and plate cam. Although they can meet the processing requirement in some certain extent, they have some inevitable defects such as bad shape of the wire sheet, incompact structure, impact at the returning point, low transmission efficiency, etc, so that they can’t guide silk rapidly, turn the edge down and effect the drying quality. In order to improve the situation above, this thesis presented a novel traverse mechanism driven by non-circular gears with multi-order and modified Fourier pitch-line, and carried out its mathematical model, parameter optimization and simulation analysis.The main research contents are as follows:1) Summarized the researches status at home and aboard of the traverse mechanism of automatic silk reeling machine, and analyzed the shorts. A novel traverse mechanism driven by non-circular gears with multi-order and modified Fourier pitch-line was presented, and its mathematical model including the kinematics analysis of non-circular gears with multi-order and modified Fourier pitch-line, the one of conjugate cam mechanism and the one of slider-crank mechanism was established. A kinematics analysis software of the novel traverse mechanism with human computer interaction was written. The influence of the main parameters of the novel mechanism on the movement characteristics of lead screw was analyzed by using the software.2) In the thesis, we introduced the principle and the rule of silk yarn winding. The mathematical model of the wire sheet forming was established after simplifying the winding principle. The software of the wire sheet forming was written, and the influence of the main parameters of the novel mechanism on the shape of wire sheet was analyzed by using the software.3) In order to meet the ideal silk sheet shape, a list of optimal parameters of the new-type mechanism was optimized based on genetic algorithm. The best shape of silk sheet also was gotten by the optimal parameters.4) The structure of the new-type traverse mechanism was designed according to its optimal parameters, and its 3D modeling and virtual assembly were accomplished by using UG software. The simulation of the kinematics of the novel traverse mechanism was carried out by using ADAMS software. Some deviations were found after the contrast between the simulation results and the theoretical results. After analyzing the deviations, we found that the deviations could not be avoided. Considering these all above, in this thesis, the mathematical model established was correct and the structural design of the mechanism was reasonable. |
