scholarly journals A Review of Intelligent Unmanned Mining Current Situation and Development Trend

Energies ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 513
Author(s):  
Kexue Zhang ◽  
Lei Kang ◽  
Xuexi Chen ◽  
Manchao He ◽  
Chun Zhu ◽  
...  

Intelligent unmanned mining is a key process in coal mine production, which has direct impact on the production safety, coal output, economic benefits and social benefits of coal mine enterprises. With the rapid development and popularization of 5G+ intelligent mines and coal mine intelligent equipment in China, the intelligentization of intelligent unmanned mining has become an important research topic. Especially with the promulgation of some Chinese policies and regulations, intelligent unmanned mining technology has become one of the key technologies of coal mine production. To understand the connotation, status quo and development trends of intelligent unmanned mining, this paper takes the relationship between key technologies and engineering application of intelligent unmanned mining in China as the perspective. It is proposed that the intelligent unmanned mining technology is in the whole process of working face mining. A research structure of unmanned follow-up operation and safe patrol is changing to the mode of intelligent adaptive mining, followed by the basic concepts and characteristics of intelligent unmanned mining. Relevant researches that maybe beneficial to the proposed research content are reviewed in four layers, which include basic theory, key technology, mining mode, and overall design system theory and technology. Finally, the current intelligent unmanned mining mode and future trends in this field in China are summarized.

Author(s):  
Xinzhong Xu ◽  
Kepeng Xu ◽  
Baoqing Li ◽  
Qing Chen ◽  
Hongde Jiang

In this part of present paper the key technologies for steam turbine blade and non-blade components developed by using the precise, full-dimensional (PFD) system is described firstly. For blade components advanced aerodynamic concept and design method for customized after-loaded profile, compound-lean blade, tandem cascade, contoured endwall, and solid particle erosion protection for HP and IP first nozzle have been developed. For non-blade component including main steam inlet/control valve, LP exhaust hood, packing seal and cavity flow, casing opening and condenser, new aerodynamic and mechanical design has been developed. New blade and non-blade components were experimentally and numerically investigated to verify its performance. Finite element method (FEM) analysis for all key components is also illustrated in this paper. Secondly the approach of validation and updating for the PFD system is introduced. Based on a large amount of on-site performance test data in power plants the statistic accuracy for the PFD system is given. It shows that in comparison with conventional F3D design methodology another 1.5-2 percent of HP and IP overall section efficiency improvement has been achieved.


Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Hua Guo ◽  
Hai-Qiao Wang ◽  
Shi-Qiang Chen ◽  
Zhi-Rong Wu

To solve the “special coal seam” with complex coal seam structure, fault phenomenon, and many gangue layers and complex gangue lithology in Qi Panjing coal mine, the problems such as hole collapse and blockage of coal seam water injection dust removal drilling are caused. From the aspects of drilling layout, drilling technology, and gangue material consolidation, a complete set of key technologies for prevention and control of water injection and dust removal in “special coal seam,” have been formed. Seven boreholes have been drilled in I020902 return air roadway of Qi Panjing coal mine, and field comparative test has been carried out. The results show that: after adopting the complete set of key technologies of drilling prevention and control, the drilling depth is 85-100 m, the average depth is 98 m, and the drilling depth of coal seam water injection can reach 170-185 m; the footage per cycle is greatly improved, with the minimum increase of 30.86%, the maximum increase of 46.38%, and the average increase of 36.77%, to save drilling time and bring good economic benefits, and there is no collapse in the borehole hole, to ensure the safety of production. It has a good reference, and practical guiding significance for other coal mining faces, especially for “special coal seam” working face.


2013 ◽  
Vol 753-755 ◽  
pp. 2307-2310
Author(s):  
Ya Jing Song ◽  
Shu Ping Wang ◽  
Hui Wang

With the rapid development of national economy, the demand of coal resources is growing. The tunneller play a privotal role in the coal mining. Improving the control level of the tunneller system, it is helpful to ensure that the coal mine production is safe and efficient.


2014 ◽  
Vol 941-944 ◽  
pp. 2601-2605
Author(s):  
Ming Li

Because of the rapid development of China's coal industry, the average depth of mine increase continuelly, the stress increases obviously, roadway are often difficult to support in many coal mine especially in soft rock. Soft rock have traits of low strength, expansion and rheology seriously, affect the safety of mine production and economic benefits, thus the supporting of soft rock roadway engineering has become one of the most complex and the most major problems to solve. By analysising the deformation characteristics of soft rock and deformation characteristics and influence factors of soft rock roadway, We discuss the supporting method and supporting principle of soft rock roadway.


2014 ◽  
Vol 1044-1045 ◽  
pp. 759-762 ◽  
Author(s):  
Peng Ju Zhao ◽  
Yu Zhu

In recent years, with the continuous development of our society and economy, coal mining is also expanding the scale, and belt conveyor is widely used in coal mine production as a belt conveyor device. However, in practice, due to the low mass of reactive power, large loss of reactive circulation and large starting current, belt conveyor threaten the safety of coal production in addition to bring enterprises the economic losses. In this context, the realization of coal belt conveyor automation system design can not only reduce maintenance costs, extend working life, but also ensure life and property safety of mine workers, and ultimately improve the social and economic benefits of enterprises.


Author(s):  
Yudong Bao ◽  
Linkai Wu ◽  
Yanling Zhao ◽  
Chengyi Pan

Background:: Angular contact ball bearings are the most popular bearing type used in the high speed spindle for machining centers, The performance of the bearing directly affects the machining efficiency of the machine tool, Obtaining a higher value is the direction of its research and development. Objective:: By analyzing the research achievements and patents of electric spindle angular contact bearings, summarizing the development trend provides a reference for the development of electric spindle bearings. Methods:: Through the analysis of the relevant technology of the electric spindle angular contact ball bearing, the advantages and disadvantages of the angular contact ball bearing are introduced, and the research results are combined with the patent analysis. Results:: With the rapid development of high-speed cutting and numerical control technology and the needs of practical applications, the spindle requires higher and higher speeds for bearings. In order to meet the requirements of use, it is necessary to improve the bearing performance by optimizing the structure size and improving the lubrication conditions. Meanwhile, reasonable processing and assembly methods will also have a beneficial effect on bearing performance. Conclusion:: With the continuous deepening of bearing technology research and the use of new structures and ceramic materials has made the bearing's limit speed repeatedly reach new highs. The future development trend of high-speed bearings for electric spindles is environmental protection, intelligence, high speed, high precision and long life.


Author(s):  
Lanlan Xu ◽  
Qiang Zhou

With the rapid development of computer and network technology, the application of mobile app has been involved in all walks of life, especially the traditional art teaching mode. Therefore, it is of great significance to design an app with art learning and education as the main content based on the concept of young people's cognitive psychology and art training. This paper first analyzes the current situation and development trend of art education app at home and abroad, then analyzes and studies the design and application needs of education app at home, clarifies the needs of students and teachers, analyzes the visual and psychological characteristics of teenagers and their impact on interface and interaction design, and finally designs an art education app that meets the domestic needs. The results show that the app can enhance the interest of young people in art learning.


Energies ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 3049
Author(s):  
Marek Borowski ◽  
Piotr Życzkowski ◽  
Klaudia Zwolińska ◽  
Rafał Łuczak ◽  
Zbigniew Kuczera

Increasing emissions from mining areas and a high global warming potential of methane have caused gas management to become a vital challenge. At the same time, it provides the opportunity to obtain economic benefits. In addition, the use of combined heat and power (CHP) in the case of coalbed methane combustion enables much more efficient use of this fuel. The article analyses the possibility of electricity production using gas engines fueled with methane captured from the Budryk coal mine in Poland. The basic issue concerning the energy production from coalbed methane is the continuity of supply, which is to ensure the required amount and concentration of the gas mixture for combustion. Hence, the reliability of supply for electricity production is of key importance. The analysis included the basic characterization of both the daily and annual methane capture by the mine’s methane drainage system, as well as the development of predictive models to determine electricity production based on hourly capture and time parameters. To forecast electricity production, predictive models that are based on five parameters have been adopted. Models were prepared based on three time variables, i.e., month, day, hour, and two values from the gas drainage system-capture and concentration of the methane. For this purpose, artificial neural networks with different properties were tested. The developed models have a high value of correlation coefficient. but showed deviations concerning the very low values persisting for a short time. The study shows that electricity production forecasting is possible, but it requires data on many variables that directly affect the production capacity of the system.


Author(s):  
Yucheng Shen ◽  
Wei Lu

With the rapid development of Internet technology in China, mechanical drawing plays a more and more important role in social development and practice. The main purpose is to use the course of mechanical drawing to accurately represent the appearance, size, principle and technology of the machine. It is often called the language of communication in the industry. In order to make mechanical drawing better applied and practiced, and to make maximum use of Internet technical resources, the establishment of multimedia courseware teaching mechanism is the development trend of mechanical drawing.In order to adapt to the trend of network information, based on the multimedia environment, this paper studies the application of animation technology in mechanical drawing teaching, and constructs a small multimedia teaching platform. Through the explanation of animation courseware, students can better understand the making and principle of mechanical drawing, and cultivate students' divergent thinking. The teaching platform combines teaching material knowledge with practice to deepen students' understanding of the basic content of mechanical drawing. Finally, the rationality and practicability of the system are analyzed by investigating the platform users. The results show that the application of animation technology in mechanical drawing teaching is reasonable and practical.


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