Substantiation of using a high-precision ultrasonic device for automated control of the parameters of fibrous products for possible use in enterprises processing fiber raw materials of the Russian agricultural production

Abstract

It is proposed to achieve a wider use of Russian-made fiber raw materials in Russian cotton spinning mills by using a high-precision ultrasonic device for automated control and analysis of quality indices of spun products (ribbons, roving) in a wide range of yarns. The research goal is to substantiate the parameters of an ultrasonic device (sensor, secondary digital device and information processing system) for automated quality control of spun products based on the analysis of measurements. The measurements were carried out in the technical laboratory of the textile enterprise according to the program of current control ensuring the stability of the spinning technological process. The actual data obtained on the linear density, unevenness and strength of the thread were compared using two measurement forms: ultrasonic attenuation and weight. The indices of deviation of the linear density from the average value of the coefficient of variation and the actual strength of the thread were also taken into account. The strength was estimated by the average breaking load of the thread and the breakage rate on the spinning machine (the number of breaks of 1000 spindles per hour). These tests are shown by graphs of the deviation of the linear density of spinning products. Samples to determine these indices were taken on two chains of carding and belt machines every hour of the production line operation. Thread strength was determined by the actual breaking load of a single thread on a strength testing machine; the breakage rate was determined at the release of ring spinning machines (the number of breaks of 1000 spindles per hour). A typical yarn sorting of 25 Tex was performed. It was found that the ultrasonic device allowed measuring the linear density of products in the full range of fluctuations in the parameters. The measurement parameters of linear density and unevenness according to the signals of the ultrasonic device were obtained in units of weight, with an average error relative to the weight of linear density ± 2%, by unevenness ± 0.8%. The indices of yarn strength on the strength testing machine and breakage on the spinning machine were identical and uniquely characterized the quality of the yarn. The obtained research findings allow concluding that an ultrasonic device for monitoring linear density and unevenness may be used as a basic tool for automated quality control of spun products.