Purpose -The purpose of this paper was to create conditions for the correct decision concerning an exchange of the used rope for a new one. A cognitive goal was to indicate the causes of its wear and determining its mechanism reliability and durability. Design/methodology/approach -The magnetic, organoleptic and strength standard tests of lifting triangle-strand ropes of a mining hoist were carried out. This way the current state of the tested rope was defined. Findings -On the basis of an analysis of the results of the performed tests: magnetic, organoleptic and fatigue tests, it can be said that the magnetic one is accurate enough only to indicate the place of the rope's biggest weakening, though the degree of weakening is not defined precisely -with significant excess. The accurate rope's destruction degree is indicated by the strength tests. Practical implications -The results of described investigations can improve safety of the mining rope mechanisms operation, even for an increased resource. Originality/value -The elementary wear processes, which are the basic reason for the destruction of the rope, are indicated. Rope destruction is caused mainly by tribological factors: abrasion, corrosion and fatigue wear. Magnetic tests are accurate enough only to indicate the place of the rope's biggest weakening (qualitative index). Most precisely, the rope's destruction degree (quantitative index) can be found by the strength tests.
Purpose -The purpose of this paper is to determine the appropriate conditions for the chemical deposition of Ni-P-Al 2 O 3 composite coatings, deposited on metalic matrix. Design/methodology/approach -Auto catalytic reduction of Ni in nickel sulfate and sodium hypophosphate bath, including 10 percent volume fractions of nanodispersive Al 2 O 3 particles is treated in the alloy steel 100Cr6. The wear resistance and friction coefficient of the coatings are determined using tester T-01M, a ball-disc tester for mitigated solid friction conditions, in model lubricants: oil bases, oil bases with antiwear additives AW. Findings -The analysis of the properties of the Ni-P-Al 2 O 3 deposits confirms that the presence of the dispersion phase of aluminium oxide determines the coating wearability. Practical implications -The paper presents some indications of proper selection of antiwear coating generation methods (their parameters and conditions). Originality/value -Investigations show that tribocatalytic effect of nickel coatings influence the intensity of antiwear layers generation in zinc dialkyldithiophosphates (ZDDP) tribochemical interaction in model lubricants and that tribochemical, adsorption, and reaction-diffusion effect of ZDDP, decided on great effectiveness of generated antiwear surface layers, which was confirmed by the results of tribological investigation.
In the paper there were discussed factors which determine wear process intensity of shaft hoist rope. The ropes as the element or the elements set are appearing in numerous, diverse machines and mechanisms, fulfilling the most different functions in them. Mining shaft hoists are a very representative example of the object being used for a vertical transport, of both the staff of the mine and winning. Results of experimental investigations of rope were presented. Findings obtained different methods were compared.
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