Karetin V. Substantiation of parameters of the inertial planetary safety mechanism of the screw conveyors

In the dissertation, on the basis of the set of generalized scientific results, the new actual problem of increasing the technological efficiency of screw transport mechanisms operation process is solved due to design improvement and substantiation of parameters of the inertial planetary safety clutch, which is produced on the basis of the biplanetary inertial mechanism with a mobile reactive link. On the basis of the conducted theoretical and experimental research the following has been developed: analytical dependences which allow to analyse the displacement of the imbalance point and the mechanism in general; analytical dependences for determination of kinematic and dynamic parameters of the operation stop mode of the screw conveyor with inertial planetary safety clutch; empirical equations that characterize the change in braking torque of the stop mode and the torque transmission efficiency. Grounded on the conducted theoretical and experimental research, the optimal parameters of the inertial planetary safety clutch of the screw conveyor are substantiated. The braking safety torque of the output shaft of the screw conveyor inertial planetary safety clutch in the stop mode is formed by means of increasing the imbalance energy due to acceleration of the imbalance rotation around its axis and the drive axis of the pulse module as well as range variation of 19.6 … 29.4 N∙m, when respective gear ratio of the imbalance drive equals to 2.2. Rational functioning of the process of the screw conveyor operation in terms of providing maximum braking torque of the output shaft in case of overload of its working parts in the range from 20 N∙m to 42 N∙m, or the beginning of the stop mode of the screw conveyor, is achieved by the following parameters: input shaft speed is from 262.5 rpm to 437.5 rpm; the gear ratio of the upper imbalance drive is from 2.0 to 3.2 and the lower imbalance drive is equal to 1.0. The annual economic effect achieved by increasing the technological capabilities of the screw conveyor is UAH 12,209.7. The research results were implemented at PJSC "TerA" (Ternopil), LLC "Ukraine" (Ternopil region, Pidvolochysk district) and PP "Ukraine-Agro-2C" (Khmelnytsky region, Chemerivtsi district) in technological lines, respectively, for transportation and dough formation and for transportation of bulk products and goods. Theoretical and practical results of the research were implemented in the educational process of Ternopil Ivan Puluj National Technical University during teaching the subject "Drives of Machines and Machine Complexes". The constructive novelty of the technical solution is protected by a patent of Ukraine for a utility model.