scholarly journals Experimental Tests of Selected Constituents of Movement Resistance of the Belt Conveyors Used in the Underground Mining

2015 ◽  
Vol 15 ◽  
pp. 702-711 ◽  
Author(s):  
Miroslav Bajda ◽  
Robert Krol
Keyword(s):  
Underground Mining ◽  
Experimental Tests ◽  
Belt Conveyors

scholarly journals Experimental tests of the impact of selected parameters on the indentation rolling resistances

2018 ◽  
Vol 29 ◽  
pp. 00002 ◽  
Author(s):  
Dariusz Woźniak ◽  
Lech Gładysiewicz ◽  
Martyna Konieczna
Keyword(s):  
Main Part ◽  
Rolling Resistance ◽  
Experimental Tests ◽  
Conveyor Belt ◽  
Significant Component ◽  
Different Types ◽  
Indentation Rolling Resistance ◽  
Belt Conveyors ◽  
The Impact

Belt conveyors are main part of transporting systems in mines and in many other branches of industry. During conveyor belt works different types of resistances are generated. Indentation rolling resistance is the most significant component of the resistances from the perspective of energy losses and it cause the biggest costs as well. According to latest state of analyses and measurements it is well known that theoretical rolling resistance were underestimated in comparison with the measured in-situ one. In this paper new method for determination indentation rolling resistance is presented. The authors compared theoretically and experimentally established damping factors. The relation between these two values enabled to obtain more precise equation for damping function. This function is one of the most important component in calculation of the rolling resistance. In new theoretical model value of rolling resistance is nearly twice higher than this used so far.

scholarly journals Experimental and Numerical Investigation of Blast-Induced Vibration for Short-Delay Cut Blasting in Underground Mining

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
Dan Huang ◽  
Xianyang Qiu ◽  
Xiuzhi Shi ◽  
Yonggang Gou ◽  
Jian Zhou
Keyword(s):  
Underground Mining ◽  
Near Field ◽  
Vibration Reduction ◽  
Simulated Data ◽  
Experimental Tests ◽  
Rock Breaking ◽  
Engineering Structures ◽  
Short Delay ◽  
Delay Times ◽  
The Mean

It is essential to control the damage to the surrounding rock and engineering structures in the process of cut blasting with a single free surface in underground mining. To reduce vibration induced by cut blasting, this paper proposes short-delay cut blasting, in which blast holes that are near each other are sequentially initiated with short-delay times. Experimental tests of cut blasting were conducted in a roadway in the Shaxi copper mine to compare the peak particle velocity (PPV) and frequency characteristics of simultaneous blasting and short-delay blasting. Numerical modelling was then developed to study the influence of short-delay times on blast vibration. The accuracy of the numerical simulation was verified by the comparison of the test and simulated data of single-hole blasting. The results show that the amplitude reduction ratio (ARR) value increases gradually with the increase in delay intervals, and the vibration reduction for delay intervals smaller than 6 ms is very limited, particularly in the near field. The principal frequencies (PFs) for short-delay blasting are similar to those for simultaneous blasting, which implies that the frequencies do not increase directly with the decrease of the delay intervals. The experimental tests also show that the mean frequencies (MFs) for the 8 ms delay are slightly higher than those for the 0 ms delay blast. In the case of ensuring the rock breaking of cut blasting, longer delay intervals of 8∼10 ms are beneficial to further reduce PPV in practical blasting.

scholarly journals A Mobile Robot-Based System for Automatic Inspection of Belt Conveyors in Mining Industry

Energies ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 327
Author(s):  
Jarosław Szrek ◽  
Janusz Jakubiak ◽  
Radoslaw Zimroz
Keyword(s):  
Underground Mining ◽  
Mining Industry ◽  
General Concept ◽  
Underground Mines ◽  
Automatic Inspection ◽  
Large Area ◽  
Inspection Robot ◽  
Spatially Distributed ◽  
First Results ◽  
Belt Conveyors

Mechanical systems (as belt conveyors) used in the mining industry, especially in deep underground mines, must be supervised on a regular basis. Unfortunately, they require high power and are spatially distributed over a large area. Till now, some elements of the conveyor (drive units) have been monitored 24 h/day using SCADA systems. The rest of the conveyor is inspected by maintenance staff. To minimize the presence of humans in harsh environments, we propose a mobile inspection platform based on autonomous UGV. It is equipped with various sensors, and in practice it is capable of collecting almost the same information as maintenance inspectors (RGB image, sound, gas sensor, etc.). Till now such experiments have been performed in the lab or in the mine, but the robot was controlled by the operator. In such a scenario the robot is able to record data, process them and detect, for example, an overheated idler. In this paper we will introduce the general concept of an automatic robot-based inspection for underground mining applications. A framework of how to deploy the inspection robot for automatic inspection (3D model of the tunnel, path planing, etc.) are defined and some first results from automatic inspection tested in lab conditions are presented. Differences between the planned and actual path are evaluated. We also point out some challenges for further research.

scholarly journals Analytical method for establishing indentation rolling resistance

2018 ◽  
Vol 29 ◽  
pp. 00001
Author(s):  
Lech Gładysiewicz ◽  
Martyna Konieczna
Keyword(s):  
Rolling Resistance ◽  
Experimental Tests ◽  
Travel Speed ◽  
High Energy ◽  
Operating Conditions ◽  
New Method ◽  
Long Distance ◽  
Indentation Rolling Resistance ◽  
Belt Conveyors ◽  
The Impact

Belt conveyors are highly reliable machines able to work in special operating conditions. Harsh environment, long distance of transporting and great mass of transported martials are cause of high energy usage. That is why research in the field of belt conveyor transportation nowadays focuses on reducing the power consumption without lowering their efficiency. In this paper, previous methods for testing rolling resistance are described, and new method designed by authors was presented. New method of testing rolling resistance is quite simple and inexpensive. Moreover it allows to conduct the experimental tests of the impact of different parameters on the value of indentation rolling resistance such as core design, cover thickness, ambient temperature, idler travel frequency, or load value as well. Finally results of tests of relationship between rolling resistance and idler travel frequency and between rolling resistance and idler travel speed was presented.

scholarly journals An innovative person detection system based on thermal imaging cameras dedicate for underground belt conveyors

Mining Scince ◽  
2019 ◽  
Vol 26 ◽  
Author(s):  
Fabian Uth ◽  
Bartosz Polnik ◽  
Wojciech Kurpiel ◽  
Ralph Baltes ◽  
Peter Kriegsch ◽  
...  
Keyword(s):  
Thermal Imaging ◽  
Underground Mining ◽  
Detection System ◽  
Test Case ◽  
Person Detection ◽  
Long Wavelength ◽  
Safety Improvement ◽  
Coal Rock ◽  
Belt Conveyors ◽  
Transportation Routes

Within the INESI-project (Increasing Efficiency and Safety Improvement in Underground Mining Transportation Routes) long-wavelength infrared (LWIR) cameras are used for detecting persons on underground belt conveyors or within hazardous areas e.g. in front of crusher or skip vessels by the project partners KOMAG and the Institute for Advanced Mining Technologies (AMT). The test case for evaluating the performance of thermal imaging regarding these applications is the Polish Sobieski underground coal mine operated by Tauron mining company. By the development of thermal image processing algorithms, an automated detection of persons and classification of different objects was achieved. This may allow implementing smart services for person detection on underground belt conveyors as well as material characterization between coal, rock and disturbing objects on belt conveyors.

scholarly journals Unification of Equipment for Transporting People, Coal and Materials Produced by Jastrzębskie Zakłady Remontowe Sp. z o. o. and Used in the Mines of the JSW Capital Group

2020 ◽  
Vol 3 (1) ◽  
pp. 303-314
Author(s):  
Artur Dyczko ◽  
Rafał Rychter ◽  
Adam Bosowski ◽  
Jarosław Konsek
Keyword(s):  
Underground Mining ◽  
Coal Mines ◽  
Innovative Solutions ◽  
First Results ◽  
Potential Benefits ◽  
Belt Conveyors ◽  
Near Future

AbstractThe publication presents the assumptions of the unification process of machines and equipment produced by Jastrzębskie Zakłady Remontowe Sp. z o. o. and operating at the coal mines of the JSW Capital Group. It outlines a solution adopted by JZR Sp. z o. o. addressing this issue. The authors identify the potential benefits of the process to the entire Jastrzębska Spółka Węglowa Capital Group, but they also mention the risks that may arise during its implementation. The publication also presents the first results of the unification, observed on the basis of the unified equipment and machinery of the coal clearance system for transporting people, coal and materials, which has already been put into operation in underground mining excavations. It also includes a chapter devoted to the influence of the unification on the development of “technical thought,” i.e. on the innovativeness of the equipment for transporting people, coal and materials newly produced by Jastrzębskie Zakłady Remontowe Sp. z o. o. which are to be implemented in the near future. New, innovative solutions are presented, which were introduced both in the unified transport devices such as chain and belt conveyors and in devices cooperating with them, i.e. lump breakers, pushing devices and other accessory equipment for the conveyors.

scholarly journals An Inspection Robot for Belt Conveyor Maintenance in Underground Mine—Infrared Thermography for Overheated Idlers Detection

2020 ◽  
Vol 10 (14) ◽  
pp. 4984 ◽  
Author(s):  
Jarosław Szrek ◽  
Jacek Wodecki ◽  
Ryszard Błażej ◽  
Radoslaw Zimroz
Keyword(s):  
Infrared Thermography ◽  
Hot Spots ◽  
Underground Mining ◽  
Mechanical Systems ◽  
Conveyor System ◽  
Safe Place ◽  
Inspection Robot ◽  
Spatially Distributed ◽  
Underground Infrastructure ◽  
Belt Conveyors

It is well known that mechanical systems require supervision and maintenance procedures. There are a lot of condition monitoring techniques that are commonly used, and in the era of IoT and predictive maintenance one may find plenty of solutions for various applications. Unfortunately in the case of belt conveyors used in underground mining a list of possible solutions shrinks quickly. The reason is that they are specific mechanical systems—the typical conveyor is located in the mining tunnel and its length may vary between 100 and 1000 m. According to mining regulations, visual inspection of the conveyor route should be done before it will start the operation. On the other hand, since environmental conditions in mining tunnels are extremely harsh and the risk of accidents is high, there is a tendency to minimize human presence in the tunnels. In this paper, we propose a prototype of an inspection robot based on a UGV platform that could support maintenance staff during the inspection. At present, the robot is controlled by an operator using radio however, we plan to make it autonomous. Moreover, its support could be significant—the robot can “see” elements of the conveyor route (RGB camera) and can identify hot spots using infrared thermography. Moreover, the detected hot spots could be localized and its position can be stored together with both types of images. In parallel, it is possible to preview images in a real-time and stored data allow analysing state of conveyor system after the inspection mission. It is also important that due to radio control systems, an operator can stay in a safe place. Such a robot can be classified as a mobile monitoring system for spatially distributed underground infrastructure.

Tool for Studying Effects of Human Operators on Energy Consumption of Working Hydraulics of Off-Highway Working Vehicle

2014 ◽  
Author(s):  
Lauri O. Luostarinen ◽  
Rafael Åman ◽  
Heikki Handroos
Keyword(s):  
Energy Efficiency ◽  
Energy Consumption ◽  
Real Time ◽  
Research Methods ◽  
Power Transmission ◽  
Underground Mining ◽  
Low Cost ◽  
Experimental Tests ◽  
Human Operator ◽  
Human Operators

The improvement of the energy efficiency is an important topic for off-highway working vehicle developers and manufacturers. New energy efficient technologies, e.g. a hybrid power transmission with an energy recovery feature, have been introduced. However, currently most of the working vehicles are using more conventional technologies. Human operators have an effect on the overall efficiency of the vehicles. The research of the human effect is difficult and expensive using the conventional research methods. A real-time simulation and virtual reality (VR) technology have developed fast recently. A VR-based real-time simulator is a powerful low-cost tool and enables a several novel research methods. The aim of this study is to find the suitability of the VR-based simulator to find the effect of a human operator on the energy consumption of the working hydraulics of off-highway working vehicles. Experimental tests are carried out using human-in-the-loop simulation in an immersive VR-environment. The vehicle used for the case study is an underground mining loader. The results show that the proposed method is valid to find the values for the energy consumption and energy efficiency of a working hydraulics. A variation in the energy efficiency of the working hydraulics was found. The variation correlates with the operator’s driving style. With a larger group of operators the effect of a human operator on the energy consumption can be defined.

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