Current issue

 

    e-ISSN 2719-3306

 

Małgorzata MALEC

PROF. ADAM KLICH – IN MEMORIAM


Tomasz KORBIEL 

AGH University of Science and Technolology, Poland

Stefan CZERWIŃSKI

retiree

Keeping mining machinery in operationbased on energy factors

p. 123-129

Mining machinery maintenance strategy based on the current dynamic condition of the equipment not only improves reliability, reduces repair and renovation costs, but also affects electricity costs. Due to the use of modern monitoring and diagnostic systems, as well as advanced control and supervision methods, it is possible to improve the efficiency of devices and thus reduce energy costs. Due to the high power of the devices, even a slight decrease in efficiency translates into significant financial resources. Taking into account the prices of electricity as well as ecological aspects, investments in modern solutions give specific financial and social savings.

Keywords: maintenance, technical diagnostics, energy indicator

 

Stanisław SZWEDA, Marek WOJTASZCZYK

KOMAG Institute of Mining Technology, Poland

Tibor KRENICKY

Technical University of Košice with a seat in Prešov, Slovak Republic

Tests of selected elements of building components
in the light of compulsory requirements

p. 130-140

A procedure of standard strength tests of reinforcement bars conducted at present at the ITG KOMAG is discussed. Taking advantage of the bibliographic review, concerning tests of reinforced concrete with steel reinforcement bars, a possibility of using the KOMAG testing infrastructure to broaden the scope of tests of reinforcement bars was analyzed. Due to a more and more common use of composite bars for reinforcing and strengthening concrete structures, the methods of testing their strength properties are discussed. The conditions enabling to conduct strength tests of composite reinforced concrete bars at the ITG KOMAG are determined.

Keywords: steel reinforcement bars, strength tests, composite reinforcement bars, pullout test of bars, bar adhesion test to concrete

 

Tamer RIZAOĞLU, Canberk ÇOŞKUN, Murat CAMUZCUOĞLU

Kahramanmaraş Sütçü İmam University, Turkey

Determination of physical and mechanical properties
of limestones used as marble in Tut-Adiyaman Region in Turkey

p. 141-148

This study aimed to reveal the petrography and physical-mechanical properties of limestones, which have an important reserve and are used as marble, in Tut district of Adıyaman province, which is one of the important cities of southeast Anatolia. As a result of petrographic analysis of the rock known commercially as Emprador, it was determined that it is bioclastic limestone with abundant nummulite fossils. Density, dry and saturated unit weight, water absorption, surface roughness, abrasion resistance and uniaxial compressive strength tests were applied to determine the physical and mechanical properties of the limestones. According to the test results obtained, the density of the limestones, dry unit weight, saturated unit weight, water absorption by weight, water absorption by volume, average surface roughness, ten points roughness average, maximum roughness value, Böhme abrasion resistance and uniaxial compressive strength values were determined as 2.486 gr/cm3, 2.478 gr/cm3, 2.52 gr/cm3, 1.482%, 3.644%, 3.31 µm, 16.24 µm, 20.03 µm, 8.958 cm3/50cm2 and 1004.03 kgf/cm2 respectively. The results show that the limestones in and around Tut (Adıyaman) county can be used in large areas for decorative purposes, with their physical and mechanical properties, as well as their colour tone and the texture formed as a result of the calcite veins being shaped like a natural pattern.

Keywords: natural stone, marble, limestone, physico-mechanical tests

 

Henryk BADURA

Silesian University of Technology
Professor Emeritus, Poland

Analysis of one-day forecasts of the maximum methane concentrationin
a tailgate of a longwall ventilated with U system - a case study

p. 149-157

Methane that is released into the mine atmosphere poses a threat to the miners working there. Methane at concentrations of 5-15% by volume in air is an explosive gas. It has caused devastating explosions in mines all over the world. Therefore, in methane mines, concentration of methane in the face and in the entire mine is controlled through well-designed ventilation system. This system controls concentration of methane in the mine atmosphere and in the rock mass as well as in the mine goafs. The article’s main objective includes a presentation of a forecast for maximal methane concentration in the determined time interval.  Sensors were installed in the gate draining the air from longwall: up to 10 m in front of the longwall and at the roadway exit. Both forecasts were made using prognostic equations, using the measurement data in the ventilation roadway of one of the longwalls at the JSW S.A. mine.

Keywords: : methane, maximum methane concentration, methane concentration forecasts, methane concentration sensors

 

Łukasz BOŁOZ

AGH University of Science and Technolology, Poland

 

Use of the iLogic Autodesk Inventor tool
in the process of designing self-propelled drilling rigs

p. 158-172

In the article, a practical example of using the Autodesk Inventor Professional iLogic tool for designing self-propelled drilling rigs has been presented. Self-propelled drilling rigs are advanced mining machines with a complex structure. At the design stage, most of the structural changes affect the stability, manoeuvrability and coverage area of the machine. Working on detailed machine models is time-consuming and unnecessary in the initial phase of the project. Therefore, a parametric 3D model of a two-boom drilling rig has been developed. It enables a quick analysis of selected machine properties depending on a number of significant parameters. The most important dimensions, masses and centres of gravity of each subassembly are entered by transparent editing windows. Next, model tests are carried out taking into account the pass through a face end of a given width as well as the coverage area of a face with specific dimensions. At each stage of model tests, the location of the machine's centre of gravity against the stability triangle background is analysed.  In addition, the model allows entering the longitudinal and transverse angles of inclination of the working as well as determining the distance of the centre of gravity from the tipping edge. The model is a practical tool that makes it possible to easily determine the inner and outer turning radius as well as the working area of ​​the machine while constantly controlling its stability. Due to the use of simplified geometry of subassemblies, the changes in parameters ​​result in an instantaneous change of the model and allow a quick analysis of their impact.

Keywords: :self-propelled drilling rigs, machine stability, parametric modelling, iLogic, Autodesk Inventor Professional

 

Paweł KAMIŃSKI

KOMAG Institute of Mining Technology, Poland

Darian BOŽIČ

Coal Mine Velenje, d.o.o., Slovenia

Shaft reaming machine for maintenance
of mine shafts in the salt rock mass

p. 173-179

Due to rheological properties of salt rock mass, maintenance of mine excavations, including shafts may be very challenging, especially in the long term. Many different ideas and approaches to a subject of sinking and maintaining a shaft in salt rock mass have emerged over the years, of which the main directions include two opposite ideas, such as an application of high-strength lining and an approach based on flexible lining. The article presents a shaft reaming machine designed for maintenance of mine shafts located in salt rock mass designed with a flexible shaft lining approach.

Keywords: :mine shaft, shaft maintenance, salt rock mass, salt mining, mine safety, shaft reaming machine