Experimental And Numberical Study On Pressure Balance System Of Negative-pressure Air Passage Automatic Winding Machine

The automatic cone and cheese winding machine is one of the most important devices in the textile process, which has a great impact on the subsequent process. And the automatic winding machine cannot work without the stable negative-pressure system. The stable negative-pressure system can effectively grab the yarn to make the winding process running properly.Improving the negative pressure air passage of the winding machine can reduce the pressure loss in the wind tunnel, and make the pressure distribution more uniform. In this case, the energy consumption can be cut down a lot.After choosing the air passage of the winding machine as the research object of this paper, combined with experiments, numerical calculations and theoretical analysis, a series of work has been done.First of all, through pressure measuring experiment of the air passage of the winding machine, we get the approximate pressure distribution of the air passage.Secondarily, we use the numerical simulation method to simulate the flow field, when there is none of the winding units splicing. The physical model of the air passage is built by the help of CFD software FLUENT. We adapt the SIMPLE algorithm, both the standardκ?εturbulence model and SSTκ?ωturbulence model in the simulation. Through the comparison of the results acquired from the simulation and the experiment, the simulation is proved reliable.For the randomness of the winding units splicing, we use related theories in probability theory and stochastic process to analysis the number of winding units which are splicing at the same time. By the numerical simulation method, the pressure distributions of the air passage are obtained, in the situations that are more likely to occur.Subsequently, the pressure loss of the air passage is analyzed, when none of winding units is splicing, in order to achieve the reasons of the pressure loss and suction uneven. Compared with other programs for uniform suction, variable cross-section is more practical and useful. After that, we figure out a ladder-type wind tunnel to bring out uniform suction, and provide several means to reduce the pressure loss.Lastly, the air duct is advanced further, according to the practical situation. Then, we simulate the advanced air passage when none of winding units is splicing, and the advanced air passage in the situations that are more likely to happen. Compared the pressure distributions of the air passage before and after improvement, it argues that after improvement the pressure loss is decreased, and the suction is more uniform.