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1
Content available Study of transport possibilities in the resonance zone of the new vibratory conveyor equipped with the single electro-vibrator
Żmuda Weronika, Czubak Piotr
Vibrations in Physical Systems
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2023
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Vol. 34, nr 1
art. no. 2023116
EN
The new vibratory conveyor, which is during patent pending [1], equipped with a single electro-vibrator intended for an accurate material dosing, was investigated in the hereby study. Possibilities of material transportations and dosing both in and out the circum-resonant zone were investigated. Dependencies of the transport velocity of the tested conveyor as functions of the excitation frequency for a certain range of load were determined. The high usefulness of the machine in the production lines requiring accurate material dosing was indicated. It was pointed out that the conveyor can transport the feed at a constant velocity, regardless of the feed mass, which is unique for the conveyors of inertial drive.
2
Content available Operation of a new single-vibrator conveyor on the falling slope of the second resonance
Żmuda Weronika, Czubak Piotr
Transport Problems
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2023
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T. 18, z. 4
223--232
EN
The paper presents the possibilities of operating an innovative single- vibrator-driven vibratory conveyor [1] in the vicinity of the second resonance zone. The characteristics of operation on both ascending and descending slopes are presented. The differences in the suspension deflection of the additional mass (which is a dynamic eliminator) during operation before and after the resonance were analyzed. We proposed working on the descending slope of the second resonance in order to increase the durability of the device. This is because the amplitude of the suspension deflection of the additional mass is limited and, due to its high stiffness, is exposed to material fatigue. This is an unusual method of operation for conveyors because it carries certain risks, such as the risk of the device entering resonance on its own or the problem of maintaining constant angular velocity of the unbalanced masses. This paper presents both analytical and simulation studies, which were then confirmed on a laboratory stand designed and built by the authors.
3
Content available Transport features of a new, self-attuned conveyor
Czubak Piotr, Surówka Witold
Transport Problems
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2022
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T. 17, z. 4
5--16
EN
The new vibratory conveyor destined for the accurate dosing of materials was investigated in the present work. The possibilities of the system to transport materials in the circum-resonant zone were tested analytically, as well as by simulations. The optimal work point of the system, which allowed a decrease in the amplitude of eliminator vibrations on its suspension due to operations on the resonance slope, was determined. Transport velocities depending on the excitation frequency and feed mass were determined by simulations. The results were verified on the conveyor of industrial dimensions designed and built in accordance with the patent application.
4
Content available Investigations of the transport possibilities of a new vibratory conveyor equipped with a single electrovibrator
Żmuda Weronika, Czubak Piotr
Transport Problems
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2022
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T. 17, z. 4
127--136
EN
In the present study, a new vibratory conveyor (patent pending) equipped with a single electro-vibrator intended for an accurate material dosage is investigated. The possibilities of material transportation in the circum-resonant zone were investigated analytically and by simulations [1]. Furthermore, the dependencies of the transport velocity of the tested conveyor as functions of the excitation frequency were determined. Favorable excitation frequencies at transports in the main and reversal directions were found, and the high usefulness of the machine in the production lines requiring accurate material dosage was indicated. A control strategy allowing for a sudden stop of the transported material was also proposed.
5
Content available Numerical review of selected solutions of vibratory feeders capable of dosing feed material
Surówka Witold, Czubak Piotr
Vibrations in Physical Systems
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2020
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Vol. 31, nr 3
art. no. 2020322
EN
The authors investigate selected solutions, to show how hard it is to find the ones that would simultaneously: dose the feed, work on a centrifugal drive, and could be freely scalable. Moreover, the authors introduce a classification of analysed cases by their amplitude-frequency characteristics. Exemplary characteristics of simplified models allow distinguishing which one of them is suitable to be adopted for dosing conveyor (feeder). The authors come to the conclusion that it is worth to begin the design process exactly by composing a proper mechanical system, in respect of amplitude-frequency characteristics. Furthermore, the paper points out the most important features of vibratory feeders, capable of dosing bulk materials.
6
Content available Influence of the excitation frequency on operations of the vibratory conveyor allowing for a sudden stopping of the transport
Czubak Piotr, Surówka Witold
Vibrations in Physical Systems
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2020
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Vol. 31, nr 3
art. no. 2020303
EN
Transport possibilities of the new vibratory conveyor in dependence on the excitation frequency of inertial vibrators were investigated in the hereby paper. The comprehensive model of the machine together with the loose feed material was tested. Simulations allowed to determine the dependence of the transport velocity on the excitation frequency. The time needed for a sudden stopping of the transport was also investigated. The new controlling strategy, realised by means of the excitation frequency, was proposed for situations when there is a necessity of sudden stopping of the transport.
7
Content available remote Latent reactions in suspensions systems of vibratory machines supported by leaf springs.
Michalczyk Jerzy, Czubak Piotr
Archive of Mechanical Engineering
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2000
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Vol. XLVII, nr 4
311-323
EN
The paper discusses an occurence of latent reaction in the direction perpendicular to the movement of the suspension systems in vibratory machines supported by parallel leaf springs. These reactions occur despite an apparent lack of any forces acting in that direction and may - for long machines bodies - reach values comparable with the exciting force of the vibrator. Analytical relationships allowing for estimation of the value of reactions were derived. The obtained results were veryfied by means of the Geometric Element Method as well as by the preformed experiments.
PL
W pracy wskazano na występowanie w maszynach wibracyjnych podpartych na układzie równoległych resorów reakcji na kierunku wzdłużnym resorów. Reakcje te występują przy pozornym braku wymuszeń na tym kierunku i dla długich korpusów maszyn osiągać mogą wartości porównywalne z siłą wymuszającą wibratora. Wyprowadzono zależności analityczne dla określenia wartości tych reakcji i przeprowadzono ich weryfikację za pomocą analizy układu z wykorzystaniem metody elementów geometrycznych jak również weryfikacji doświadczalnej.
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