Influence of dynamic characteristics of water spray weft insertion mechanism on free jet
In order to meet the needs of different widths of waterjet wefting looms,based on the principle of Bernoulli and liquid continuity,the dynamic model of the waterjet weft insertion mechanism and the numerical model of the maximum distance of the initial section of the nozzle free jet and the jet traction force of the weft yarn were established,and its dynamic characteristics were analyzed and the minimum speed of the cam system was determined by the spring rate coefficient,and the dynamic characteristics of the mechanism under different spring stiffness coefficients and the maximum compression amount of the spring were discussed to affect the plunger motion cycle,maximum jet velocity,Reynolds number,maximum distance of the initial section of the jet,the influence of jet traction on the weft yarn.The simulation results show that when the spring stiffness coefficient increases,the plunger motion cycle becomes smaller,the corresponding minimum speed of the cam system becomes larger,when the maximum compression amount of the spring is 0.029 m,and the spring stiffness coefficient is 40 000,50 000,60 000 N/m,the maximum water jet velocity is 62.19,69.85,78.99 m/s,the maximum distance of the initial section of the jet is 937,1 000,1 074 mm,and the waterjet traction force of the weft yarn is 5.37,6.44,7.28 N.The maximum compression of the spring has little effect on the above variables.Therefore,under the demand for large wide weaving machines,the use of springs with larger stiffness coefficients should be considered first.
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