Abstract
During an in-situ operation of machines, used for the exploitation of energy raw materials, a damaging impact of the environment on the components of these machines is experienced. The action of degrading factors is mostly shown in the form of a clear synergistic effect. In particular, this effect can be seen during an exploitation of driving elements of scraper conveyors, used as one of the basic machines in the hard coal mining process. In the article, the subject–matter, connected with an operation of sprockets in scraper conveyors, is presented. Special attention is paid to a mutual reaction of the mineral abrasive and the presence of mine water. The main objective of the research work was a determination of the interactive component of the factor causing an abrasive wear–quartz abrasive connected with the associated action and the factor intensifying electrochemical corrosion–water with and without the NaCl salt content. Experimental tests were conducted in the conditions similar to the reality, with the use of a test rig in the form of a short scraper conveyor. Within the framework of the test abrasive wear rates for the case of the abrasive presence itself and a mixture of the abrasive, salt and water were determined. Based on the obtained results, it appears that there is a synergistic impact of abrasive–corrosive mixtures on the wear of the surface layer of the chain sprockets under testing, and also, the causes of the interactive component values in the function of hardness and maximum strength of the materials under investigation are presented.
Highlights
At present, when drifting underground headings, drifting methods based on blasting technologies or involving heading machines are used
As for the abrasive wear test (Variant A) and the surface-hardened L35GSM, L30GS and A6 steel, the impact of the abrasive grains caused a formation of quite deep micro-cuttings on the surface of the sprocket bottom (Figure 9A)
This observation should be taken critically because in the case of the manganese steels (L30GS, A6), there were unexpectedly high abrasive wear values (Variant A) and the low ΔV/VM relative ratio might result from the effect of a high reference
Summary
At present, when drifting underground headings, drifting methods based on blasting technologies or involving heading machines are used. The occurrence of the above-mentioned degradation factors during the operation of scraper conveyors determines the form of damage to the chain drums of conveyors; at the same time, this damage usually has a complex form, e.g., in addition to the abrasive or tribocorrosive wear of the teeth, their fractures or surface deformations are observed. There are dry workings, where water in the excavated material can may vary significantly. There are dry workings, where water in the excavated material come onlyonly fromfrom the sprinkler system of a of heading machine. In such a case, grains of the can come the sprinkler system a heading machine.
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