Current issue

 

 

 

Zbigniew SZKUDLAREK, Tatiana N. IVANOVA

KOMAG Institute of Mining Technology, Poland
Perm National Research Polytechnic University, Russia

Mechanization of cleaning the area of operating belt
conveyor system

p. 2-12

Cleaning the belt conveyor system components is one of the greatest challenges when it comes to operational reliability and fire safety.

Machines and equipment used abroad for cleaning the conveyor belt and removing dirt accumulating under and next to the conveyor are discussed. The importance of cleaning the conveyor’s surroundings with respect to reliability of the belt operation and fire hazard, is emphasized. Design of the boom to clean the floor under and next to the conveyor belt, is presented in detail. The boom is equipped with a jaw bucket that allows for pushing, scooping, and moving (hauling away) the run-of-mine. It was installed on an adapted existing caterpillar chassis powered by an electro-hydraulic unit.

The kinematics of boom operation in a confined workspace is analysed. The 3D visualization and a description of the boom design with a preliminary FEM analysis of the boom’s arm is presented.

The design and range of the boom's operation allow cleaning backfilled and hard-to-reach spaces under the working conveyor.




Keywords: small mechanization, power industry, conveyor transport, boom

 

Jerzy JAGODA, Mariusz HETMAŃCZYK, Krzysztof STANKIEWICZ

KOMAG Institute of Mining Technology, Poland
Silesian University of Technology, Poland
KOMAG Institute of Mining Technology, Poland

Dispersed, self-organizing sensory networks supporting
the technological processes

p. 13-23

Examples of automation of technological processes for mineral extraction are presented. Aspects related to the diagnostics of machines and devices during operation processes are discussed. Applying the distributed sensor networks to enable designing and manufacturing the machines and devices operated in accordance with the idea of Industry 4.0, the Internet of Things, M2M communication and autonomous behaviour was proposed. The paper presents impact of applying the distributed sensor networks on increasing work safety (multi-redundant communication) and reducing the employment in hazardous areas is presented. Implementation of algorithms based on swarm intelligence to control the routing processes of distributed sensor networks was suggested. Areas of application of distributed sensor networks based on swarm intelligence in other industries (renewable energy sources) are also outlined.



Keywords: sensor networks, swarm intelligence, routing, intrinsic safety

 

Jacek KORSKI

FAMUR S.A. Poland

Longwall shearer haulage systems - a historical review.
Part 2 – First cordless haulage systems solutions

p. 24-33

Searching for cordless haulage systems started in early 50-ties of XX century. In semi-mechanized longwall faces in Germany and Hungary tracked narrow face cutter-loaders (first continuous miners) were used. Real trials began ten years later in Great Britain. First solutions described in this article were simply an adaptation of the existing Anderson’s or BJD’s single or double drum shearers. The main idea was to interfere to as less as possible extent with the shearer structure. After the first positive trials and experiences in British and French mines the first cordless solutions such as Rackatrack, Peratrak or ram propulsions were either developed or gone to the past. This article is a review of the first cordless shearer haulage systems



Keywords: longwall mining, longwall system, coal cutter-loader, coal shearer, shearer haulage system, cordless haulage systems, chainless haulage systems

 

Paweł FRIEBE

KOMAG Institute of Mining Technology, Poland

Determining the possibility of using the Polish aggregates
for recovery of rare earth elements

p. 34-43

The high and constantly growing interest in Rare Earth Elements (REE) results from their desirable properties that are required in the state-of-the-art technologies. These elements are widely distributed in nature but most often found in low concentrations. Poland's resources are limited to a few poor deposits. KOMAG has started research projects aimed at extending the knowledge about the content of REE in Polish raw materials. Five Polish natural aggregates were selected for testing. The method of mass spectrometry with inductively coupled plasma ionization (ICP-MS) were used for analyses. Content of REE in the tested materials was found to be in the range of 190.0-14.8 ppm. Basalt aggregate marked with number 1 and halloysite had the highest content, and the lowest content was in the granite aggregate and sand marked with number 2. Then, the grain class 0.045-0 mm was separated to determine REE content in fine grains of materials. The test results indicate different proportions between light and heavy REE in the samples of the tested materials.

Keywords: rare earth elements (REE), screening, natural aggregates

 

Małgorzata MALEC, Romana ZAJĄC

KOMAG Institute of Mining Technology, Poland

Harmonization of technical requirements in the scope of machines
for underground mines

p. 44-52

In the European Union different methods of harmonizing technical requirements are accepted. The main legal instrument includes, among others, directives and European standards which are a key component of the European Single Market. European Standardization plays an important role in the development and consolidation of the European Single Market. The fact that each European Standard is recognized across the whole of Europe, and automatically becomes the national standard in 34 European countries, makes it much easier for businesses to sell their goods or services to customers throughout the European Single Market. This article presents general principles of implementing uniform technical requirements contained in the harmonized standards following the example of mining machines, in particular powered roof supports. The article concerns the standard EN 1804-Parts:1; 2; 3, i.e. Machines for underground mines - Safety requirements for hydraulic powered roof supports:

  • Part 1: Support units and general requirements,
  • Part 2: Power set legs and rams,
  • Part 3: Hydraulic and electrohydraulic control systems.

The authors described the work results of the Technical Committee CEN/TC 196 “Mining machinery and equipment - Safety”, over the years 2017-2020, oriented onto establishing three new edition of standards. These new edition of standards have been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association and supports essential requirements of EU Directives.

Keywords: European Standard, mining machines, hydraulic powered roof supports

 

Lilianna STAŃCZAK, Wojciech KANIAK

KOMAG Institute of Mining Technology, Poland
Rexroth Bosch Group, Canada

Occupational health and safety management in hard coal mines
in the aspect of dust hazard

p. 53-62

The article presents interdisciplinary knowledge on the management of occupational health and safety in hard coal mines with special attention paid to a control of the dust hazard. Shaping the safety culture is analyzed in the social, organizational and technical aspects. It should be borne in mind that accidents at work-places result not only from dangerous conditions but also from dangerous behaviours of workers. Shaping of safe work conditions in the mining industry is essential due to a high degree of complexity of technological processes and also due to natural hazards. In the article some information is given on the reasons of accidents in the coal mining industry. A model of the safety culture impact on a frequency of accidents and occupational diseases as well as the conditions for undertaking safe behaviours are discussed. It is highlighted that safety culture requires a complex approach oriented onto an investigation of relationships among: man-labour-environment. The article is ended with a description of the conception of occupational health and safety management in the aspect of dust hazards. It sorts out the knowledge and gives pragmatic guidelines, concerning the safety issues.

Keywords: awork safety, work safety culture, work safety culture management, dust hazards

 

 

Dominik RUPIK, Liubomyr Romanyshyn

KOMAG Institute of Mining Technology, Poland
Ivano-Frankivsk National Technical University of Oil and Gas, Ukraine

Concept of a Drill Press Rotary Tool Workstation Stand with
a strength analysis

p. 63-72

Comparative analysis of the strength properties of a drill stand intended for a power tool made by the selected manufacturer and the stand of own design is the paper subject. The specifics of high-speed power tools as well as their capabilities, practical applications and limitations are described. The design of a commercially available drill stand for a drill press rotary tool is presented. Basic issues in the field of CAD modelling, as well as the most important concepts related to the finite element method, as well as the stages of strength analysis using the above-mentioned method, are presented. Based on the simplified model and the analysis of the presented stand, a CAD model of a drill press stand, designed in accordance with own alternative concept is given. Results of the analysis of the static stiffness of both models using the finite element method and the conclusions drawn on this basis are presented.

Keywords: drill stand, power tools, FEM analysis, static stiffness, CAD