Abstract:

The axial six-bar linkage beating-up mechanism based on the crank and rocker mechanism with non-quick return characteristics series-connected with the basic linkage group in two revolute joints and one prismatic joint model was proposed aiming at the demand of consistent force-loading to the weft yarn on each layer during the carbon fiber multilayer weaving process. The dimensional synthesis method with the combination of rigid body guidance and the mechanism geometrical relations was also provided. Taking into consideration of the limit position of reed and the force transfer property, the design of beating-up mechanism was optimized, and the feasible size of machine and transmission angle were determined. Simulation results of kinematics show that: the error rate of both the reed limit position and the movement of beating-up mechanism is 0.06%. The reed beating-up has a high acceleration at the front dead center, and the acceleration has few changes near the back dead center, which is beneficial to the tightening of heavy fabric and machine noise reduction. Driven by the axial six-bar linkage beating-up mechanism, the reed exerts perpendicular force to weft yarn on each layer of carbon fiber multilayer fabric. Each layer of the fabric is subject to even force, and the dimensional synthesis method has provided a certain theoretical basis and experimental data for the design and optimization of beating-up mechanism that takes account of specific requirements such as weaving technology, kinetic performance and machine size.

Key words: carbon fiber multi-layer loom, beat-up mechanism, kinematics analysis, dimension comprehensive method