I. Introduction The quality of the fine sand process directly affects the quality and yield of the yarn. In the production of spun yarns, yarn breakage is the key to affecting product quality, output and energy consumption. There are still a large number of traditional ring spinning machines in use in China's current spinning mills, with national policies and market pairs. The demand for energy saving and consumption reduction, the traditional spinning machine upgrade and transformation market is highlighted. Figure 1 is a schematic view of the unilateral structure of the spinning frame. Figure 1 Schematic diagram of the single side structure of the spinning frame Second, the energy-saving transformation point in the ring fine sand machine process In the spinning process of the ring spinning machine, the forming process of one spindle is generally divided into small yarn stage, medium yarn stage and large yarn stage according to the size of the spindle. The specific demarcation points of small, medium and large yarns are generally determined by the length of the spinning of different yarn types. In the spinning process of the traditional spinning machine, the speed of the whole machine is constant throughout the forming process of the spindle, which results in: the tension fluctuation of the small yarn stage is large; the tension fluctuation of the medium yarn is small and stable but the speed is too low; increase. The variation law of tension fluctuation determines the distribution law of the yarn breakage is the most, the middle yarn breaks the least, and the large yarn breaks more. In order to solve the shortcomings of small yarn and big sand breakage, the transmission spinning machine has adopted the method that the whole machine has been running at a lower speed. This kind of process method limits the increase of the vehicle speed, and the medium yarn breaks less, the speed potential cannot be exerted, which affects the improvement of the machine production efficiency. In order to solve the above contradiction, the main motor frequency conversion control mode is adopted, the low speed operation in the small yarn, the medium yarn speed increase, and the large yarn proper deceleration mode, the yarn tension variation in the whole spinning process is simulated, and the tension fluctuation is small, thereby improving the overall The efficiency of spinning efficiency. Figure 2 shows the control cabinet for the frequency conversion fine sand machine using the Delta solution. Figure 2 Delta inverter sand control cabinet
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