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The coal resource of China is abundant, and the minable of thin seam mining coal is over 6.15 Gt. However, the work condition of coal excavation is very complex. The dark and narrow work space limit the operation space of hydraulic cover support machine and the activity of workers.
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Coal mine belt conveyors are not only traditional, simple mechanical conveying devices but also automatic control system operating devices that integrate …
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Expansive soil is the most predominant geologic hazard which shows a large amount of shrinkage and swelling with changes in their moisture content. This study investigates the macro-mechanical and micro-structural behaviours of dredged natural expansive clay from coal mining treated with ordinary Portland cement or hydrated lime addition. The …
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Large room-and-pillar stone mining fundamentals. The value per ton of ore for large room-and-pillar stone mines is typically low, therefore productivity must be high. Typical face areas are 12.2 m wide x 7.6 m high (40 ft wide by 25 ft high) with 4.3 m (14 ft) pulled with each blast (Figure 1). This equates to over 1,000 tons of stone per ...
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In order to achieve safe and efficient mining for extremely thick coal seam more than 20 m, a new fully mechanized top-coal caving mining method with first …
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Conveyor belts are widely used in ore transportation in large-scale mines for their long transportation range, high safety, and strong economic applicability. Coal mine belt conveyors are not only traditional, simple mechanical conveying devices but also automatic control system operating devices that integrate safety, stability, and low power …
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On the engineering scale, considering the roadway Ji-14-31050, buried in Pingdingshan Coal Mine No. 12 as the research base, four parameters—anchor bolt stress, borehole …
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Abstract. To meet the requirement of the braking response of the coal mine hoist, a new electromechanical. demonstrated, and the detailed parameters and braking performance of electromechanical ...
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In 2017, the State Administration of Work Safety of PRC and other government agencies united the mining subsidence researchers and technicians to re-compile The Regulations of Coal Mining and Pillar Design for Protecting Buildings, Water Bodies, Railways, Main Mineshafts and Tunnels (hereinafter called "The Regulations of …
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Innovation plays a critical role in the mining industry as a tool to improve the efficiency of its processes, to reduce costs, but also to meet the increasing social and environmental concerns among communities and authorities. Technological progress has also been crucial to allow the exploitation of new deposits in more complex scenarios: …
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the conveyor is coal, so some properties of the coal are given in Table 1. Table 1: Pulley . Some mechanical properties of coal. 2. width. Pile mater. Density of coal [t/m. 3] …
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In many underground coal-mine fields, where small scale coal mining had been performed, the available resources were not extracted fully. To extract the remaining coal, it is necessary to perform secondary mining. In this paper, a novel secondary mining technology is suggested incorporating a novel concept of building a key bearing layer …
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For efficient use of geological coal resources, as well as coordination development between coal mining and environment protection, land resource conservation, sustainable development of coal mine areas, and realization of "green mining", a novel method of working-face goaf area roof management is needed …
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Application of mechanical excavators for rock excavation in both civil construction and mining engineering fields has increased significantly in recent years [1]. This is due to mechanization of excavation in comparison with drilling and blasting method provides an important potential for faster development, reduced costs, smaller capital ...
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The results indicate that the prototype has good terrain adaptability and strong obstacle-surmounting performance. Received 02 September 2009; accepted 15 December 2009 *Corresponding author. Tel: 86 516 83591917 E-mail address: [email protected] doi: 10.1016/S1674-5264 (09)60227-1 Mobile platform of rocker-type coal …
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Mechanism and Explosion-proof Design for a Coal Mine Detection Robot. ... with tracks. As shown in Fig.1, LURKER-3 is a tracked robot equipped with two flippers. Fig.1 (a) LURKER-3 under coal mine; (b) Mechanical transmission schematic of LURKER-3 102 Xuewen Rong et al. / Procedia Engineering 15 (2011) 100 â€" 104 Author name / …
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The coal resource of China is abundant, and the minable of thin seam mining coal is over 6.15 Gt. However, the work condition of coal excavation is very complex. The dark and narrow work space limit the operation space of hydraulic cover support machine and the activity of workers.
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Summary. In contrast to the proximate analysis, ultimate (elemental) analysis and certain of the physical properties, the mechanical properties of coal have been little …
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In order to study the mechanism of the dynamic disaster of rockburst in a deep coal mine and the prevention and control measures of weakening shock, the MTS815.03 servocontrolled rock mechanics ...
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However, the mechanical properties of coal are of value as a means of predicting the strength of coal and its behavior in mines when the strength of coal pillars and stability of coal faces are extremely important factors. There are different methods for estimating coal strength and hardness: compressive strength, fracture toughness, or ...
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The research results show that the automatic control system of fully mechanized mining face in coal mine proposed in this paper has a good intelligent control effect. Equivalent circuit model of a ...
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the possible exception of coal pillars. Numerous roof bolt design methods have been proposed, but a recent survey paper concluded that none "has gained any acceptance by the coal mining industry" [Fuller 1999]. It seems that the complexities of the bolt-ground interaction continue to defy complete solution.
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Fig. 2 illustrates the workface layout of proposed new fully mechanical mining method in extremely thick coal seam, which combines with large mining height and top-coal caving mining methods, named LHTCM. In the extremely thick coal seam, it can be divided into three layers with A, B and C.Firstly, pressure-relief mining (stage Ⅰ) …
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Abstract. In view of the present situations and existing problems of thin coal seam mining under complex geological conditions, low-profile mining equipment for fully mechanized …
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Abstract. Fully mechanized mining (FMM) technology has been applied in Chinese coal mines for more than 40 years. At present, the output of a FMM face has reached 10 …
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Abstract: Many water-related problems are confronted in coal mining, and the mechanical properties of coal inevitably deteriorate due to water–rock interactions. …
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Mine planning and design involves the compilation and integration of all relevant geological, geotechnical, mining, engineering and economic data into a single document to define and describe the exploitation strategy for a particular mineral or coal deposit …
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Today’s top 31 Mining Mechanical Engineer jobs in South Africa. Leverage your professional network, and get hired. New Mining Mechanical Engineer jobs added daily.
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The maximum concentration of respirable dust is reduced from the original 161.1mg/m3 to 31.7mg/m3, and the dust reduction efficiency at the measurement opening is 80.32%. The average total dust reduction efficiency of the measured dust points is 81.07%, and the average exhalation dust reduction efficiency is 80.63%.
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As we all know, the pressure arch widely exists in the. surrounding rock after the coal mining and the pressure arch. helps in keeping the roof stability during the coal mining. Ren and Qi found ...
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