Browsing by Author "Trokhaniak, Oleksandra"
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- Investigation of contact stresses in engagement elements of screw conveyor safety clutchPublication . Bulgakov, Volodymyr; Trokhaniak, Oleksandra; Aboltins, Aivars; Rucins, Adolfs; Tkachenko, Mycola; Almeida, Arlindo; Kuvachov, VolodymyrIn the article there is presented the design of a safety clutch for a screw conveyor with time-separated modes of slipping and axial displacement of the screw for automatic restoration of the operating condition in the event of overload. A calculation has been made using contact stresses in the engagement elements of the safety device, the level of which is the determining indicator that affects the wear rate of the contact surfaces. Using the SolidWorks Premium software diagrams of the distribution of contact stresses during operation of the safety clutch were constructed, by the results of which it was established that the analytical dependencies, presented in the article, can be used in the engineering design of various standard sizes of this protective mechanism.
- Theory of Operation of a Safety Finger Coupling Applied in the Drive of a Screw Conveyor for Bulk Agricultural MaterialsPublication . Bulgakov, Volodymyr; Pascuzzi, Simone; Olt, Jüri; Almeida, Arlindo; Trokhaniak, Oleksandra; Nowak, Janusz; Ihnatiev, Yevhen; Kiernicki, Zbigniew; Paciolla, Francesco; Scarascia-Mugnozza, GiacomoThe aim of the study is to enhance the operational characteristics of a screw conveyor during overloading of its working mechanism by substantiating the rational parameters of the safety coupling. Theoretical calculations and their graphical dependencies were performed using the Delphi programming environment. To increase the magnitude of axial displacement of the driven half-coupling with the jammedworking element, while reducing dynamic loads during overloading, a design of a safety coupling has been developed. To determine the rational parameters of the safety coupling for the screw conveyor, the influence of dynamic loads on the operation of the safety coupling during overloading of the screw conveyor’s working mechanism has been analyzed. From the analysis of the graphs, it has been determined that an increase in the rotation frequency n leads to an increase in the torque of the system. With a change in rotation frequency from 50 rpm to 200 rpm, the torque Td increases by 64.8%, Tr rises by 65.2%, and Tm increases by 63.8%. It has also been determined that an increase in the mass m of moving links leads to an increase in loads on the drive. When the mass increases from 10 kg to 20 kg, the torque Td increases by 15.8%, Tr rises by 12.5%, and Tm increases by 17.3%.