Screening Efficiency Analysis of Vibrosieves with the Circular Vibrations

Abstract

The analysis of influence of factors that depend on construction characteristics of the vibrosieves with circular vibrations on screening efficiency is presented in this paper. The dependence of the screening efficiency on the aperture size, length and inclination of the screen, as well as on vibration amplitude, is considered. Based on obtained results, one can see that the screening efficiency increases with vibration amplitude and the screen length increase. Further, increases of the screen inclination and aperture size are causing an initial increase of the screening efficiency, which is later decreasing.

Parametric resonance domain of a parametric excited screen machine

“…The natural frequency of the sieve plate is around 0.5 s -1 while the external excitation frequency is around 1 s -1 . Therefore, while the first system vibrates in normal resonance mode the second operates at twice its natural frequency (see equations (5)). Calculating the boundaries of the PR domain analytically in the PR-based screen machine is a challenging subject due to the nonlinear terms in equation (5).…”

“…Therefore, while the first system vibrates in normal resonance mode the second operates at twice its natural frequency (see equations (5)). Calculating the boundaries of the PR domain analytically in the PR-based screen machine is a challenging subject due to the nonlinear terms in equation (5). In this section, HPM is applied, as a powerful computational technique to determine the domain of unstable response with variable working parameters.…”

“…The maximum weight of material placed on the sieve plate and the mesh weight itself determine the ρ parameter in equation (5). The first case study is to assume ρ is constant and the screen machine is modelled under the non-impact working condition.…”

“…Designing screen-working parameters is a great challenge, since the vibration should produce exciting force that crosses the mass centre to avoid material blockage [4]. In a commercial screen machine, the sieve efficiency is an essential evaluation indicator of performance and therefore, many researchers try to improve it [5][6][7]. While parametric resonance (PR) is mainly cited as an undesirable phenomenon in shell structures [8], MEMS/NEMS devices [9], nanowire system [10], etc., Slepyan et al [11] invented a new type of vibrating screen that is parametrically excited.…”

Influence of the Selected Sieving Parameters on the Sieving Efficiency of Material MCC Avicel PH102

“…In fact, the screening and sieving process, influenced by many factors, is governed by the laws of physics and fluid mechanics, which makes it a complex task. Factors affecting the movement of individual particles and thus the efficiency of the process can be divided into three groups [21]. The effects of these parameters have been investigated by many authors.…”