Vibrations in engineering and technology

Fedoskinа Olena Ph.D., Associate Professor, Associate Professor of Engineering and Generative Design Departement, Dnipro University of Technology, St. Yavornytsky, 19, Dnipo, Ukraine, 49005, e-mail: fedoskina.ev@gmаil.com, https://orcid.org/0000-0003-3719-8375

The article examines the equilibrium conditions of a material piece during its clamping between the jaws of a vibrating jaw crusher with an inclined crushing chamber. The crusher design includes a body mounted on elastic elements, featuring a rigidly connected inclined lower jaw and a hinged upper jaw, which together define the nip angle. The physical picture of the jaw-material interaction, obtained via high-speed imaging, demonstrates a stable position of the piece on the transporting surface of the jaw during the clamping phase, which is characteristic of this process.

Dynamic processes during the clamping period were investigated using a vibration-measuring system equipped with displacement and acceleration sensors, a magneto-induction tachometer, and an oscilloscope. The study determined the contact time between the jaw working surfaces and the material, the vibration amplitude, and the acceleration of the upper jaw. Experimental oscillograms characterize the dynamics in the contact zone with a non-crushable object and during jaw wedging.

Analysis of the oscillograms reveals that during the entire clamping period, the upper jaw is subjected to a high-frequency alternating force directed perpendicularly to its working surface. This result justifies the application of an effective friction coefficient for determining the nip angle. A mathematical model has been developed to establish the limiting nip angle for inclined crushing chambers, accounting for inertial forces and the effective friction coefficient.

The obtained results provide a basis for designing advanced crushing chambers and optimizing the production of fine-grained materials.

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