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1

The Influence of Static Friction on the Speed and Inclination Angle of a Belt Conveyor

Adamecki Daniel

Tribologia

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2020

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nr 5

9--16

EN

The article describes experimental studies of effective belt tension between the mined hard coal and a rubber conveyor belt. Effective belt tension has a critical impact on the safety and operational reliability of belt conveyors transporting excavated material after ascending or descending. Three samples of flame-retardant conveyor belts from three manufacturers and raw power coal material were used in the tests. In order to determine the significance of the influence of variable parameters on the values of static friction coefficients, the hypothesis on the equality of mean values of the studied variable in three populations was verified by means of the analysis of variance. On the basis of the obtained results, the maximum belt speed was determined as a function of the permissible inclination angle of the belt conveyor.

PL

W artykule opisano badania doświadczalne sprzężenia ciernego między materiałem sypkim i gumową taśmą przenośnikową. Sprzężenie cierne między materiałem sypkim i taśmą przenośnikową jest jednym z podstawowych czynników istotnych dla zapewnienia bezpiecznej i niezawodnej eksploatacji przenośnika taśmowego transportującego materiał sypki pod określonym kątem nachylenia. Badaniom poddano trzy płaskie fragmenty taśm przenośnikowych pochodzących od różnych producentów. Do obliczeń statystycznych zastosowano analizę wariancji. Na podstawie wyników określono zależność maksymalnej prędkości taśmy w funkcji dopuszczalnego kąta nachylenia przenośnika taśmowego.

2

Friction and Wear Behavior of Direct Metal Deposition on SUH3

Choi Byungjoo, Cho In-Sik, Jung Do-Hyun, Lee Moon G., Jeon Yongho

Archives of Metallurgy and Materials

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2019

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Vol. 64, iss. 3

841--844

EN

Poppet valves made from high-frequency heat-treated SUH3 steel have insufficient durability, and scratches appear on the valve face in prolonged use. It is necessary to develop surface treatment technology with excellent durability to prevent the deterioration of engine performance. Therefore, a surface treatment technology with higher abrasion resistance than existing processes was developed by direct metal deposition to the face where the cylinder and valve are closed. In this study, heat pretreatment and deposition tests were performed on three materials to find suitable powders. In the performance evaluation, the hardness, friction coefficient, and wear rate were measured. Direct metal deposition using Inconel 738 and Stellite 6 powders without heat pretreatment were experimentally verified to have excellent durability.

3

Oddziaływanie między urobkiem i taśmą w górniczych przenośnikach taśmowych – wybrane zagadnienia

Adamecki D.

Systemy Wspomagania w Inżynierii Produkcji

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2017

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Vol. 6, iss. 2

11--20

PL

Przedmiotem referatu jest przedstawienie zjawiska oddziaływania między urobkiem i taśmą w górniczych przenośnikach taśmowych. Taśma obciążona urobkiem odkształca się wpływając na wiele parametrów eksploatacyjnych przenośnika taśmowego. Linia ugięcia taśmy między zestawami krążnikowymi jest jednym z istotnych parametrów opisujących współpracę urobku z taśmą przenośnikową. W artykule przedstawiono zmodyfikowane stanowisko badawcze do identyfikacji sprzężenia ciernego między urobkiem i taśmą w warunkach drgań wymuszonych. Następnie opisano różne modele matematyczne linii ugięcia taśmy między zestawami krążnikowymi w warunkach statycznych i dynamicznych jej obciążeń.

EN

The subject of the paper is the phenomenon of interaction between excavated material and the belt in mining conveyor belts. The belt loaded by excavated material is deformed affecting in a number of operational parameters of the belt conveyor. The sag of the belt between the idlers is one of the important parameters describing the interaction between excavated material and the conveyor belt. The paper presents a modified test rig to identify the frictional contact between the excavated material and conveyor belt under forced vibrations. In the paper are given mathematical models in static and dynamic conditions describing the sag of the belt between the idlers.

4

The influence of finishing on the tribological properties of plasma sprayed MMC coatings

Charchalis A., Starosta R.

Journal of KONES

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2016

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Vol. 23, No. 1

91--97

EN

During operation of marine pumps, one of the most common disability is tribological wear of shaft neck cooperating with the gland. In the practice, worn shafts are exchanged for new or are regenerated by chromium plating, padding or thermally sprayed of ceramic coatings, mainly Al2O3 In this article, the use of plasma sprayed Ni-5% Al-15%Al2O3 composite coatings were proposed. The surfaces of coatings by turning and burnishing treatments were shaped. Tribological properties of composite materials are dependent on the proportion and size of the reinforcing phase particles contained in a metal matrix. A reinforcement composite with very small dimensions and the amounts may result in increased wear and increase the coefficient of friction. It is therefore important to check whether the advisable of phase composition will not adversely affect the wear of the composite and the cooperating the part. The presence of a 15% volume fraction of the alumina particles on the selected tribological properties of the Ni-5% Al matrix composite coatings were evaluated. In order to assess the effect of the applied tapes of finishing on wear of MMC coatings, the tribological tests were performed on the "T05" machine with head roll- piece type. It has been found that the burnishing favours a lower wear of composite coating and the cooperating element compared to the coatings after turning treatments. At the same time observed more than ten times less wear intensity of MMC coatings in the initial time of friction, which may indicate a shorter time needed to grind of cooperating elements.