Torsional oscillations of an auger multifunctional conveyor’s screw working body with consideration of the dynamics of a processed medium continuous flow

Abstract

Keywords: Screw Amplitude Resonance ConveyorIntroduction. The aim of the article is a mathematical model of vibrations of working part of screw conveyer for transporting friable loads taking into account the changes of closeness of the processed environment, speed of circulation of screw, weight while appearing of the phenomenon of resonance. Materials and methods. It is recesrced the turning vibrations of spiral working part of screw multifunctional conveyer, which appeare as a result of action of processing environment. The recerch was carried out by mathematical modelling method.Results and discussions. The limiting factors which complicate a design are the unevenness of the division of environment along the length of screw; a body makes flexible vibrations; the motion of the processed environment along the working screw causes the small vibrations of bend, causes appearance of "additional forces". For providing the authenticity of mathematical model ti has been introduced the next suppositions: the working part of screw is turned with the permanent angle speed around its longitudinal which in the undeformed position coincides coincides with an axis OX; the transversal transferring of neutral axis of working screw at the arbitrary moment in perpendicular direction of its undeformed position is determined by the vector (in relation to the fixed frame of reference of OXYZ); the continuous stream of processed environment,while its weight changes on unit length slowly along a screw and moves with permanent relative (in relation to working screw) speed.A mathematical model takes into account the limitation and supposition for the existent screw conveyer with the length of 2,5 and 3 m, which is used for moving the friable loads with the consistence of 10, 20, 40 kg/m. The alternative parameters are the length of the screw,the consistence of the processed environment, the speed of circulation ofthe screw , weightOn the basis of model the dependences of amplitude of vibrations on the lengthof screw , cosistence of the processed environment, the speed of circulation of the screw, weight are built.Conclusions. A mathematical model allows to improve the process of development and designing of the screw conveyers of the friable loads providing the reliability of process of transportion and system "the processed environment -the screw working part".

Enhancement of Agricultural Materials Separation Efficiency Using a Multi-Purpose Screw Conveyor-Separator

“…It results, on the one hand, in a certain increase in the lateral vibration amplitude of the screw and, therefore, in some increase in the dynamic stresses in it; but, on the other hand, it causes an increase in the grain mixture mixing rate. The latter contributes to the improvement of the separation process [28,29]. Thus, we should apply a complex approach to the resonance process of grain mixture transportation with separation.…”

“…The separation intensity greatly depends on the amplitude-frequency characteristics of the screw oscillations and a cylindrical body with holes (a sieve). It should be mentioned that technologically the last ones can be made variable, i.e., they can be made with holes of different sizes so that the same transporter will be able to separate grain mixtures from different grain crops [28,29].…”

Research of resonance vibrations of the system «Telescopic screw — bulk medium» caused by torsional vibrations

“…Stand for the study of the cha 1) fixed axial section of the screw; 2) a of the casing; 4) axially movable scr 6) axially movable part of the casing; 7 feed height of the material; 11) frame; 1 of the conveyor; 16) belt transfer; 17) dr Exploring the characteristics o of the system «Telescopic screw is at the same time least studied cas the case of internal resonance. Desp ral bending and indicated frequen of the «telescopic screw is a bulk m Вестник Караг of the telescopic conveyor will allow you to e dynamic loads and increase the service life of th Material and method ristics of telescopic screw conveyors and based o synthesized telescopic screw conveyors [19][20][21] study the transportation of bulk cargo (Fig. 1) [22 e in such order: load the hopper 14 with loose ma y which it is transported to the casing 6 to the au e 9 falls into the measuring vessel.…”

Analysis of Resonance Oscillations of Extruder Elastic Screw Conveyor

“…For the research of the mathematical model of the system of the environment it is an elastic spiral working part which is based on combinations of principles of simultaneity of the vibrations in nonlinear mechanical systems [5]; the wave theory of the motion [6]; the basic ideas of the methods of the indignations [5,7], namely to the asymptotic method of nonlinear mechanics [5,8] and to the method of Van der Paul [9], which are adapted for the new classes of the mechanical systems. The problems of granular medium transportation along different surfaces have been considered on the basis of many hypotheses: from motion of the material points system along the surface (Lindner H. [10][11][12]) to the continuum [13][14][15][16][17][18] of zero (analog of liquid) or finite rigidity (analog of elastic body).…”