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In accordance with the latest trends, considerable emphasis is put on all mining companies in the Czech Republic not only on reducing the environmental impact of brown coal mining, but also on overall efficiency, the balance of which can be improved by increasing of the operational reliability of individual components of technological units and reducing operating costs. And it is the latter sphere, in that Vrsanska uhelna a.s. does considerable initiative. In cooperation with the firm RENOMAG s.r.o. and the Resear...

The basic requirement placed on any machine system, technology and machine as a whole must be clearly based on the assurance of safe operation and operational reliability, and this is where maintenance is the systematic tool to achieve them. Technical diagnostics is a part of every maintenance and thus becomes one of the decisive maintenance tools in its comprehensive concept. Much attention is now being paid to lignite mining in the Czech Republic, especially when we are talking about the extraction of coal for i...

The main aim of this paper is the description of experimental operation of new bucket in real conditions of the open pit mine and the evaluation of surface temperature increasing in the case of new bucket application. The experiment was realised in two excavators KU 300 operated in the same mining conditions. The target of this experiment is the bucket surface temperature increasing evaluation and the verification of new bucket tooth geometry with tooth ESCO U35T possibilities in comparison with original variety. ...

The expense of restoring of excavators cutting bodies is increasing these days in the Most Basin area, primarily the replacement of tooth because of abrasion expense. The main reason is the complicated geological situation of overburden rocks, first of all the occurrence of sands and hard structures in the overburden cuts rocks in the deep horizons of open pit mines. The main target of this article is the brief description of realised research. It is design of the optimum methodology of bucket tooth cutting body h...

The Brown Coal Research Institute started the solving of the research project based on the optimisation of the shape and material of ground and mining machines in 2018. This research is necessary for increasing of efficiency of mining process in conditions of the Most Basin. The very important part of the research was the geological characteristic of the Most Basin main mining localities. Evaluation of the geological situation of the Bilina, Vrsany and Libous mines (mining of the overburden rocks in the CSA mine f...

The expense of restoring of excavators cutting bodies is increasing these days in the Most Basin area, primarily the replacement of tooth because of abrasion expense. The main reason is the complicated geological situation of overburden rocks, first of all the occurrence of sands and hard structures in the overburden cuts rocks in the deep horizons of open pit mines. The main target of this article is the brief description of realised research. It is design of the optimum methodology of bucket tooth cutting body h...

The target of this article is the providing of the brief information about preventing the dust spreading problems solving during operations of machinery equipment in brown coal open pit mines and in coal dumps. The main part of this paper briefly describes operation tests of the new rotary mist unit realized during last years. The increased concentration of the dust in the air causes important health hazard. The dust is very bother factor. The occurrence of the dust in operation area is the source of danger fire r...

The target of this article is the presentation of the first steps of solving the project No. TH03020368 from the programme EPSILON titled ?The optimisation of the shape and material of ground and mining machines research?. The main topic of this article is the optimization of the tooth shape and primarily the optimization of the materials used for manufacturing of cutting bodies of the ground and mining machines. This research is necessary for increasing of efficiency of mining process in conditions of the Most Ba...

The article deals with the examination of the state of the ball track at the heavy machine ZP6600/Z79. It gives results of material exams which were taken on given samples and it describes the progress and results of the numeric counting for the state of tenseness. The used method works with the ending parts at the bottom of part of the ball track when it touches the ball. The decision about the renovation of the track depended on the determination of the groove size degradation at the ball track. The material tes...

The solving of European Commission (Research Fund for Coal and Steel) research project пїЅBucket wheel excavators operating under difficult mining conditions including unmineable inclusions and geological structures with excessive mining resistanceпїЅ is under way from 2015 to 2018. The Brown Coal Research Institute j.s.c. is a member of the research team comprising Czech, Polish, Romanian and Greek technical universities and companies. The main task of the year 2016 was the realisation of the three long term meas...

The shape and geometry of bucket edge, edge and tooth material have a key influence on wheel excavator mining processes efficien cy and power consumption. The frequent change of cutting members due to their wear or break in increases mining process costs, shortens excavator operation time which mean s lower efficiency of the technological complex (TC). Every wear means a change of shape, geometry, eventually material properties of cutting members, but the incr eased power consumption of the mining process as well....

Self-ignition processes are a serious probl em in brown coal mining and depositing. Infusions and following fires are frequent events in open pit brown coal mines with seams influenced with previous underg round mining, homogenisation and other deposits, and on stock-piles of power and heat stations and industrial plants combusting coals as well. The objectives of the project from the ALFA programme No. TA01020351 are presented in this article. The project solves a research, development, and verification of a comp...