Time filter

Source Type

Niedworok A.,KOMAG Institute of Mining Technology | Baier A.,Silesian University of Technology
Solid State Phenomena | Year: 2015

Presentation of the numerical model describing a design and functionality of the prototype of surface condition detector is the paper subject. The detector, by monitoring the frictional coupling between so-called “tracking wheel” of the dedicated measuring transducer and a rail can analyse the condition of rail surface (presence of any factor that can deteriorate friction coefficient) [1]. Signal generated at the detector outlet, carrying information about local condition of rail surface, can be used to adjust braking torque of vehicles or machines moving on a track. Authors expect that implementation of the method will eliminated dangerous elongation of braking distance of rail vehicles in the result of loss of adhesion. Structure of detector of rail surface condition is described and its principle of operation is presented in a form of numerical model. Results of numerical simulations are given and they are compared with the measurements taken on the testing facility in real conditions. © (2015) Trans Tech Publications, Switzerland.


Zachura A.,KOMAG Institute of Mining Technology | Zuczek R.,Poland Foundry Research Institute
Solid State Phenomena | Year: 2015

The tooth gear, which consists of single segments, each with only one tooth, is the main component of Flextrack advance system. The sidewalls of the tooth gear have tacks of spherical shape located on the surfaces of the segments cooperating with each other. This design causes that the segments can be "seated" against each other, with no need to change the pitch between the teeth. The surfaces of tracks of tooth gear segments can incline transversely and longitudinally, and it is limited only by a special guide. The advance tooth gear system made in such way enables one to overcome horizontal and vertical inclinations of the conveyor route on which the shearer moves. The material model accepted for numerical analyses assumed the use of high strength spheroidal cast iron EN-GJS-1200-2 and L20HGSNM cast steel.The manufacture of casts of tooth gear segments in a precise casting technology enables one to obtain high accuracy of cooperating spherical surfaces as well as surfaces of the flank of the tooth cooperating with drive wheel. Accepted casting technology ensures high repeatability and the reduction of the cost of a single tooth gear segment, assuming serial manufacture.Changes applied to the design of advance system will increase the operational life of drive wheels, significantly reducing the maintenance time in very dangerous conditions.Increased wear of drive wheel teeth in a longwall shearer requires frequent replacement of this expensive component, due to use of high power drives and geometrical limitations to the advance systems.A concept of the innovative Flextrack advance system, which enables limiting the high pressing stresses between cooperating surfaces of drive wheel and tooth gear (according to Hertz), was developed. © (2015) Trans Tech Publications, Switzerland.


Jasiulek D.,KOMAG Institute of Mining Technology
Advances in Intelligent Systems and Computing | Year: 2016

On the market of energy harvesting devices, there are more and more solutions, what means strong development of this relatively new part of industry. In the case of underground mining industry, it is not possible to use the typical solutions and they must be properly adopted. Part of the project results associated with a development of wireless, self-supplying sensor networks for operation in underground mines are given. The results of the measurement of voltage generated by piezoelectric energy harvester (PEH) for of free mounting and installation in the housing, limiting its deflection, are given. Tests were conducted in the laboratory conditions, using a vibrating table. The measurement results indicate a significant reduction of energy generated by PEH when it is installed in the casing, confining its movement. Simulated operation of wireless sensor powered by PEH in a casing and without casing is also presented. © Springer International Publishing Switzerland 2016.


Grynkiewicz-Bylina B.,KOMAG Institute of Mining Technology
Ecological Chemistry and Engineering S | Year: 2011

Materials from which toxic elements, including heavy metals, can penetrate children organisms, in doses dangerous for their health should not be used for production of toys. That especially concerns the materials used for production of components that are exposed to children. The results of testing migration of selected elements like: barium, chromium, cadmium, mercury, antimony and selenium from the materials used to cover wooden and metal toys are discussed in the paper. Tests of elements migration were carried out in years 2009-2010 in the accredited Laboratory of Material Engineering and Environment at KOMAG. Requirements of the PN-EN 71-3:1998 Standard on toys safety was the basis to conduct testing. The results were assessed in the light of limits of elements migration, identifying the types of material in which exceeding of permissible values of migration were found. The elements, which migration is characteristic for a given type of coating material, were specified.


Tokarczyk J.,Komag Institute Of Mining Technology
Archives of Mining Sciences | Year: 2015

Method for virtual prototyping of cabins of mining machines operators is presented in the light of anthropotechnical assessment criteria. Anthropotechnical criteria and design of models of anthropometric features, which are used for assessment of design solutions in the aspect of safety criterion, are divided and discussed. Developed virtual prototyping method for assessment of cabin of underground locomotive operator was used. Initial simulation was made with use of Finite Element Method.


Talarek M.,KOMAG Institute of Mining Technology | Kacprzyk R.,Wroclaw University of Technology
Journal of Physics: Conference Series | Year: 2015

Electrostatic discharges from surfaces of plastic materials can be a source of ignition, when appear in explosive atmospheres. Incendivity of electrostatic discharges can be estimated using the transferred charge test. In the case of brush discharges not all the energy stored at the tested sample is released and the effective surface charge density (or surface potential) crater is observed after the discharge. Simplified model, enabling calculation of a charge transferred during electrostatic brush discharge, was presented. Comparison of the results obtained from the simplified model and from direct measurements of transferred charge are presented in the paper.


Orzech L.,KOMAG Institute of Mining Technology
Journal of Physics: Conference Series | Year: 2015

Electric discharges, depending on their character, can emit different types of energy, resulting in different effects. Single electrostatic discharges besides generation of electromagnetic pulses are also the source of N acoustic waves. Their specified parameters depending on amount of discharging charge enable determination of value of released charge in a function of acoustic descriptor (e.g. acoustic pressure). Presented approach is the basics of acoustic method for measurement of single electrostatic discharges, enabling direct and contactless measurement of value of charge released during ESD. Method for measurement of acoustic effect of impact of a single electrostatic discharge on the environment in a form of pressure shock wave and examples of acoustic descriptors in a form of equation Q=f(pa) are described. The properties of measuring system as well as the results of regression static analyses used to determine the described relationships are analysed in details.


Grynkiewicz-Bylina B.,KOMAG Institute of Mining Technology
Ecological Chemistry and Engineering S | Year: 2011

There are many chemicals in children's environment that are dangerous to their health. Some of them are eg phthalates used as plasticizers in plastic toys and in production of other articles intended for use by children. Phthalates do not form persistent connections with the polymer and migrate to the surface of the product. Children exposure to these toxic chemicals has been found to occur during licking and sucking of the product taken to the mouth by a child and during long term contact with skin. Results of tests aimed at determination of phthalates content in toys and childcare articles made in the years 2009-2011 in accredited Laboratory of Material Engineering and Environment at KOMAG according to the requirements of REACH regulation, which include limitations as regards use of the following dangerous phthalates: DEHP, DBP, BBP, DINP, DIDP and DNOP, are discussed in the paper.


Niedworok A.,Komag Institute of Mining Technology
2014 16th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2014 | Year: 2014

Innovative method of a real time measuring of drive systems operational parameters is presented. Such systems are commonly used in transportation vehicles working in cooper mines. Cardan shaft with strain gauge bridge was used as autonomous torque transducer, transmitting remotely measuring data in real time to the master system for data acquisition. © 2014 IEEE.


Dudek M.,Komag Institute of Mining Technology
Archives of Mining Sciences | Year: 2013

A concept of use of CAD systems in testing collision of underground transportation means is presented. Reasons for undertaking this problem are given with end users identified. The concept of the system for collision analyses of transported loads is described. Examples of collision analysis during transportation of powered roof support are given. Presented system is designed to aid planning, organizational and training activities undertaken in management of transportation safety in mines. It will be also possible to use software resources, developed within the system as the didactic material as regards safe transportation process, which include hazards to the employees working in the area of transportation operations. Developed prototype of a system for testing the collision of underground transportation means was positively assessed by employees of the Coal Company, JSC - industrial partner of KOMAG. This prototype is continuously improved and adapted for commercial implementation in the selected coal mines.

Loading KOMAG Institute of Mining Technology collaborators
Loading KOMAG Institute of Mining Technology collaborators