Bragg grating (FBG) displacement sensors  Kajzar et al carried out coal pillar deformation and coal roof monitoring by applying 3D laser technology within underground road- , Erich discussed collapse feature of coal mine roadways by employing seismic reﬂection investigation method 
The mining industry relies on the use of heavy equipment for various jobs Without these equipment, there would be less efficiency and productivity Machines also help make the working environment safer and less hazardous for miners Machines can do the m Positek – The UK’s Leading Linear Transducer & Linear Position Sensor Manufacturer
Mine to develop a real-time roof monitoring and roof fall warning system for underground coal min A preliminary system has been developed and successfully trialled twice in the gateroads at Ulan Mine during 2004 and 2005 The system integrates the displacement monitoring, stress monitoring and seismic monitoring in one package
"Strip mining" is the practice of mining a seam of mineral, by first removing a long strip of overlying soil and rock (the overburden)It is most commonly used to mine coal and lignite (brown coal)Strip mining is only practical when the ore body to be excavated is relatively near the surface
Opsens designed a monitoring pressure/temperature sensing solution for the mining/gas industry which is intrinsically safe The dielectric nature of the cable and the natural advantages of fiber optic, provide a secure system impervious to lightning and reliable through the harsh conditions of coal mining ,
Utilizing angular displacement to monitor failure of coal , To avoid water inrush, it conducted strip mining In order to predict the possibility of water inrush, we observed the angular displacement changes of the No9113 working face floor in the 9th mining belt
Fiber optic sensors-based intelligent coal mines , In this paper we report for the first time the concept of fiber optic sensors based intelligent coal mine system, which , displacement, crack .
Abstract: A radar coal thickness sensor is being developed by the Bureau of Mines to measure both the dielectric constant and thickness of a coal seam as part of a sensor array supporting a computer-assisted coal mining machine The noncontacting stepped-CW radar sensor measures the complex reflection of coefficient of the coal-shale interface to resolve the coal thickness to sub-wavelength .
Machine tool displacement control Wood processing, positioning and control , Container Liquid level Servo cylinder Coal mine machinery Engineering machinery vehicles Hydraulic cylinder piston position feedback Plastics Machinery Rolling Mill SDMS E Series , LVDT Displacement Sensor Magnetostrictive Displacement Sensor
MEASUREMENT OF BLAST -INDUCED GROUND VIBRATIONS AND SEISMOGRAPH CALIBRATION by MarkS Stagg 1 and Alvin J, Engler2 ABSTRACT Blast-induced ground vibrations from surface coal mine, quarry, and construction blasting were measured and analyzed for frequency content and duration characteristics Eighteen commercially available ground vibration
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quasi-static behaviour of underground coal mine roofs and the response behaviour of the bolts In particular, over 170 instrumented extensometers, closure meters, shear meters, fully-grouted passive rebar, fully-grouted , of sub-micrometre resolution displacement sensors that measure the displacement of the bolt Collectively, the array of .
Seismic Monitoring Strategies for Deep Longwall Coal Mines Peter Swanson, M Shawn Boltz, and Chambers DEPARTMENT OF HEALTH AND HUMAN SERVICES Centers for Disease Control and Prevention National Institute for Occupational Safety and Health Office of Mine Safety and Health Research Pittsburgh, PA • Spokane, WA October 2016
GUC series of mine safety type displacement sensor is a magnetostrictive principle of non-contact absolute position measurement of displacement sensors, suitable for a mixture of methane gas and coal dust explosion hazards of coal mine Contactless ,
10 Underground Coal Mine Monitoring with Wireless Sensor Networks MO LI and YUNHAO LIU Hong Kong University of Science and Technology Environment monitoring in coal mines is an important application of wireless sensor networks (WSNs) that has commercial potential
The invention relates to a disaster monitoring method for a coal mine tunnel roof The method includes the steps that before monitoring, stability of tunnel surrounding rock is estimated, a surrounding rock risk type monitoring area is determined according to an estimation result of the stability of the surrounding rock, then a serious disaster area of the tunnel roof is determined, and .
To avoid water inrush, it conducted strip mining In order to predict the possibility of water inrush, we observed the angular displacement changes of the No9113 working face floor in the 9th mining belt Six angular displacement sensors were laid in open-off cut and two angular displacement sensors were laid in upper ventilation passage
 (4) a displacement sensor array laid: the mining process, according to the progress of mining, excavation to determine the relative position relationship between the face and the encrypted stations, fast calibration emerging space adjacent to crack encrypted using stations position; cracking at the maximum crack development was ground .
The fiber optic coal mine hazard detection system is designed to acquire all the critical mine , bars as strain gauges and long gauge length displacement sensors were developed to monitor the rock displacement The range of the fibre optic displacement sensor is 0- ,
: Fiber Bragg Grating (FBG) Sensors Used in Coal Mines 121 entry retaining, the control mechanism on the gob-side roadway surrounding rock is not enough in-depth study and so on The monitoring on the support effect of gob-side entry retaining is a necessary means to test support method’s rationality
Stellar Technology’s complete selection of pressure transducers and pressure transmitters, load cells, force sensors, reaction torque transducers, temperature sensors, and LVDT displacement sensors provides test, measurement, and control solutions across this broad range of existing and new power generation applications
Sensor 1 interface in the system for controlling the displacement of the mine workings In connection with the possible emergence of the need to work with the received data.
The mine that displaced India's indigenous people About 400 Adivasi families once lived near the Chaal coal mine but were forced out by blasting and water contamination
Paired with our 25+ years’ experience, we can customise any of the ATEX, IECEx or CSA approved sensors within our range, and dispatched it to you in as little as 1-2 working days Mining Application Sensors As the leading brand in displacement transducer, Positek ,
change law for the mining process of mining the working face Finally, we use the ‘plate model’ theory to calculate the maximum failure depth of the rock strata of the working face floor for the Shuangliu Mine lower coal group 2 Project overview Shuangliu Mine is located in the centre of the Hedong Coal Field of Shanxi Province
Coal mining became a large-scale industry from the 18 th century to 1950s With coal being the main energy source, the low cost and low abundance of this material made coal mining important for the growth of the economic industry Despite a shift in the use of energy source from coal to .
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advance of the mining face, three monitoring lines were set up with an interval of 10 m between each line Each monitoring line was then sub-divided into three zones with an interval of 25 m along the direction parallel to the working face A set of displacement sensors for the gob roof and a set of stress
2 Geological and mining technical conditions The No1302N-1 working face of Xinjulong coal mine is located in the north of first mining air intake uphill at 810 m level, the No 1303N mined-out area in the east, 1303N planned working face in the West and 1302N mined-out area in the north
Download Citation on ResearchGate | On Feb 28, 2015, Zhen-Gang Zhao and others published Monitoring of coal mine roadway roof separation based on fiber Bragg grating displacement sensors