Currently, the knotting of chemical fiber filament packages in factories primarily comprises manual operations. It also has a high labor intensity and is subject to artificial subjective factors, due to which it is difficult to guarantee the quality of the finished fiber products. Furthermore, it also significantly restricts the intelligent construction of chemical fiber production. This work employs partially oriented yarn (POY) and full draw yarn (FDY) to develop an automatic knotting device. The catenary theory was used to confirm the state of the yarn and to determine the relevant parameters of the tension mechanism. The results showed that the developed automatic knotting device satisfactorily meets the conditions required for manual knotting. The curve equation that was calculated using the catenary conformations of the yarn state verified that the actual yarn state was consistent with the theory. Moreover, the work provides a theoretical foundation for subsequent mechanism optimizations.

Previous studies in the academic circle have shown that civil social security and government work evaluation are closely related. However, there is no unified answer to the inner relationship between the two. Based on this, this study uses data from the Comprehensive Survey of Social Conditions in China (CSS2019) and uses statistical methods such as descriptive statistics, T-test, and multiple regression analysis to analyze the influence of citizens' participation in social security and social security satisfaction on government work evaluation. The results found that citizens' participation in pension insurance, medical insurance, and urban and rural subsistence allowances positively affected their government work evaluation, and participation in unemployment insurance and work-related injury insurance negatively affected their government work evaluation; there was a significant difference between social security satisfaction and government work evaluation It is positively correlated. The higher the social security satisfaction at all levels of pension, medical care, employment, housing, and subsistence allowances, the higher the evaluation of government work. Based on the research results, make policy recommendations.