Wyniki wyszukiwania - BazTech

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Properties of weld overlays on regenerated wheel hub of a mining vehicle

Ambroziak Andrzej, Lange Artur, Białucki Piotr, Kaczmarek Michał

Welding Technology Review

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2019

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R. 91, nr 4

69--77

EN

The paper presents problems related to the regeneration of wheel hubs for mining machinery vehicles carried out with arc welding using the MAG method. Hubs made of medium-carbon cast steel, type LII500, were weld surfaced with filler metal grade of G4Si. The tests were aimed at determining welding imperfections and metallographic properties of the surfacing welds. The influence of heat treatment on the properties of surfacing was investigated. Hardness distributions in welded hubs after various heat treatment operations were determined. Recommendations for the technology of weld surfacing the wheel hubs were formulated.

PL

W pracy przedstawiono problemy związane z regeneracją piast kół pojazdów maszyn górniczych realizowanych napawaniem łukowym metodą MAG. Piasty wykonane ze staliwa średnio węglowego gat. LII500 napawano spoiwem gat. G4Si1. Badania miały na celu określenie niezgodności spawalniczych oraz właściwości metalograficznych napoiny. Zbadano wpływ obróbki cieplnej na właściwości napoiny. Określono rozkłady twardości w napawanych piastach po różnych zabiegach obróbki cieplnej. Sformułowano zalecenia do technologii napawania piast.

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Design of fire scenarios for Australian underground hard rock mines - Applying data from full-scale fire experiments

Hansen Rickard

Journal of Sustainable Mining

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2019

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Vol. 18, iss. 4

163--173

EN

One of the most significant tools when designing fire safety in an underground mine is the design fire methodology. This paper presents a number of design fire scenarios which were developed from risk assessments and risk analysis where a deterministic approach was implemented and where the results from earlier full-scale fire experiments in underground mines and analysis were included in the process. The developed scenarios showed that for scenarios, in which ventilation flow was in the same direction as the fuel continuity, continued fire spread to all major components were provided and longer and intermittent periods which resulted in high heat release rates resulted, would present a considerable risk to underground personnel. It was also found that the inclination of the decline has little influence on the resulting heat release rate - despite the flame tilt - and that the design of the mining vehicles was found to effectively delay or even prevent the ignition of adjacent fuel items in a number of cases. The design fire scenarios developed will provide a key tool when evaluating fire protection measures in an underground mine.

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Wyniki próbnej eksploatacji innowacyjnego optycznego systemu wspomagania pracy operatorów samojezdnego wozu wiercącego

Siwulski T., Niechwiej A., Kondoł P.

Cuprum : czasopismo naukowo-techniczne górnictwa rud

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2016

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nr 4

49--58

PL

Opracowanie zawiera podsumowanie prac wykonanych w ramach pracy badawczej, realizowanej wspólnie przez KGHM Polska Miedź S.A. i Politechnikę Wrocławską. Celem prac było opracowanie, wytworzenie oraz wykonanie testów eksploatacyjnych optycznego systemu wspomagania pracy operatorów samojezdnych wozów wiertniczych. Opracowany i wytworzony system, będący całkowicie nowym rozwiązaniem technicznym, został dostosowany do technologii procesu urabiania rudy wykorzystywanej w kopalniach Legnicko-Głogowskiego Okręgu Miedziowego. Artykuł zawiera wyniki próbnej eksploatacji systemu w rzeczywistych warunkach pracy ze wskazaniem zalet i wad nowo powstałego rozwiązania technicznego.

EN

The following elaboration includes summary of activities conducted during the research implemented jointly with the company KGHM Polska Miedź S.A and the Wrocław University of Science and Technology. The aim of the research has been to formulate, produce and conduct operation tests of the optical system of work support for self-propelled drilling truck operators. The formulated and produced system, which is an entirely new technological solution, has been adjusted to the technological process of copper ore mining used in mines of Legnica-Głogów Copper Belt. The following article includes the results of the trial operation of the system in real operating conditions, highlighting at the same time, the advantages and disadvantages of the newly created technological solution.