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Development and Parameter Justification of Vibroscreen Feed Elements

  • Mikhail Doudkin
  • Alina Kim
  • Marek MłyńczakEmail author
  • Gennady Kustarev
  • Vadim Kim
Chapter

Abstract

The article presents research results of the screening process of bulk materials with a new vibroscreen design with additional feed elements, moreover a three-dimensional solid-state computational model, as well as the results of stress-strain state analysis of feed elements rods of vibroscreen. Changes of the traditional screen structure are shown; the use of them increases the screening process efficiency and passage intensity of lower grade of bulk material to the sieve. It is established that the most simple, accessible, effective and efficient way to increase the effectiveness of the screening is the use of additional feed elements. According to the developed mathematical model of cell screening process, numerical studies to identify the effect of process parameters on the screening kinetics carried out. It is proved that the use of additional feed elements has a significant effect on the screening process kinetics and the state evolution of fine particle concentration in the bulk layer. It increases the screening effectiveness by improving the sieve filling and reduces the screening time. It is proved the performance, possibility to use, benefits, efficiency, and prospects for further research of the new vibroscreen scheme with feed elements. Description and results of comparative experimental studies of vibroscreens with different variants of additional bulk material excitation are presented. An algorithm for solving the problem numerically using the finite element method is proposed. The obtained results were used at the designing stage of the platform with feed elements for industrial vibroscreen and subsequently confirmed in work in a real experiment. The stress–strain state of feed elements rods were analyzed for various bulk materials, conditionally designated A and B, sorted by vibrating screen, where feed elements were mounted. These materials, in screening process with varying strength, acted on feed elements rods, the parameters of which did not change for the flow of various bulk materials. Rods perceived this load pressing in different ways, which was shown by the finite element analysis.

Keywords

Bulk material Screening process Vibroscreen Feed elements 

Conventional Designations

n

The material layer under the sieve

Δх

The thickness of the elementary layer

h

The height of material (m)

pu

The probability of particles transition up to

pd

The probability of particles transition down to

ps

The probability of particles stay at the cell

i

Cell number

k

Number of transition

Δt

Time of transition from one state (cell) only to another, but not is possible further (s)

ts

Time for passing of all layer of material to the sieve (s)

tk

Current moments of time, i.e. the actual finding of a particle in space (s)

P

Transition probabilities matrix

vi

Convective component

Vi

Dimensional segregation speed (m/s)

Di

Dimensional dispersion coefficient (macrodiffusion factor) (m2/s)

di

Symmetrical purely random component with zero expectation

νf

The probability of particles penetration through the sieve

Ci

The probabilities of the fact, that at any given time the particle will be in i-cell

\(E_{i}^{k}\)

State of the cells chain

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Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • Mikhail Doudkin
    • 1
  • Alina Kim
    • 1
  • Marek Młyńczak
    • 2
    Email author
  • Gennady Kustarev
    • 3
  • Vadim Kim
    • 1
  1. 1.Faculty of Mechanical EngineeringEast Kazakhstan State Technical UniversityUst-KamenogorskKazakhstan
  2. 2.Faculty of Mechanical EngineeringWroclaw University of Science and TechnologyWroclawPoland
  3. 3.Faculty of Road and Technological MachineryMoscow Automobile and Road Construction State Technical University (MADI)MoscowRussia

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