Optimal Design&Analysis Of Winding Mechanism Transmitted By Eccentric Conjugate-non-circular Gears

In the process of raw silk reeling, winding mechanism is the core part of cross windingdevice of the automatic silk reeling machine, whose role is to enable the make the yarn sheet onthe rotary drum reticulated. At present, there are two main types of domestic existing windingmechanism: one is cylindrical-cam-type, and another is crank-rocker type. Although both ofthem can meet the processing requirement to a certain extent, they have some inevitable defectssuch as bad shape of the silk yarn, incompact structure, impact at the turning point, lowtransmission efficiency, etc, so that it can not guide silk rapidly, turn the edge down and effectthe drying quality. Aiming at those questions, this thesis presented a new type of windingmechanism transmitted by hybrid-order eccentric conjugate non-circular gears, and carried onmodeling analysis, simulation and optimization.The main research contents are as follows:1) Making an overview of the development of the winding mechanism of the automatic silkreeling machine at home and abroad, analyzing the existing problems, putting forward a newtype of winding mechanism transmitted by eccentric non-circular gears, describing thecomposition, structure and the working principle of the new mechanism. Based on the analysisof formation mechanism of the pitch line of the high-order eccentric non-circular gears, theresearch of the transmission characteristic of the eccentric non-circular gears was made.Establishing the kinematic analysis model of the eccentric conjugate-non-circular gears,combination mechanism of crank-rocker&rocker-slider and conjugate cam.2) Introducing the basic principle of the thread winding, the thread formation law and twomethods of anti aliasing(axial overlap prevention method and circumferentially overlappingprevention method). The mathematical model of the shape of the silk yarn was established, andanalyzed the factors affecting the silk yarn shape.3) According the established kinematic model of the winding mechanism transmitted byeccentric non-circular gears, the auxiliary analysis and optimization software which hashuman-computer interaction function was written using MATLAB. Parameter calculation and kinematic analysis were completed using the software. Through human-computer interaction, theparametric optimization design aiming at the good shape of silk winded around the rotary drumwas completed.4) Completing the structure of the new type of winding mechanism based on the optimizedparameters. Establishing the3D model of the new mechanism using UG software, and thencompleted the virtual assembling and interference inspection. Carry on the kinematics simulationof virtual prototype using ADAMS simulation software, and compared with the theoreticalresults, which were matched well, indicating that the theoretical model and structure design areboth correct.