Operation mechanism analysis and parameter optimization of airflow-rotating disc separation device for agricultural film fragments

To reduce the impurity and loss rates during agricultural film fragment separation, an integrated airflow and mechanical separation approach was devised, and the airflow-rotating disc separation device with air suction mechanism and curved disc rotating screening mechanism was designed. The processes of throwing, collision and slipping were analyzed, considering film compressibility. The factors affecting the separation performance were identified as feeding quantity, airflow velocity and disc rotational velocity. Subsequently, a Box-Behnken response surface experiment was conducted, using fan rotational velocity, disc rotational velocity, and feeding quantity as factors, with impurity removal rate and film leakage rate as the evaluation indices. The multiple regression equations were established to depict the relationships between the factors and the indices, followed by the response surface analysis. The optimal parameter combination was a fan rotational velocity of 1450 r/min, a disc rotational velocity of 54 r/min, and a feeding quantity of 130 kg/h, attaining an impurity removal rate of 96.51% and a film leakage rate of 21.92%. The discrepancies between the verification values and the prediction values were 4.61% and 5.30% respectively, signifying the equations' reliable predictability. This research lays the groundwork for the design of film fragment separation apparatuses.