2016 Vol. 42, No. 11

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Analysis of coal mine accidents in China during 2004-2015
SUN Jiping, QIAN Xiaohong
2016, 42(11): 1-5. doi: 10.13272/j.issn.1671-251x.2016.11.001
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Abstract:
The paper analyzed the number of various types of accidents, deaths and their ratios in Chinese coal mines during 2004-2015. Since 2004, the number of deaths caused by gas accident is the largest in 2005 and 2013, the number of deaths caused by roof accident is the largest in 2015 as well as the number of deaths caused by gas accident, and the number of deaths caused by roof accident is the largest in the remaining 9 years. In the last 12 years, 20 731 death accidents occur in coal mines in China, which result in 34 729 deaths, and the average death toll per death accident is 1.7 person. Among the death accidents, the average death toll per accident of gas, water and fire are 4.4, 4.3 and 7.6 person respectively. Therefore, prevention and control of gas, water and fire accidents need to be further strengthened in order to avoid and reduce occurrence of major accidents.
Remote online monitoring and early warning system of mining slope stability
LI Bo, ZHANG Yongjun, LI Qianlong, CHAI Jiale, YANG Dengfeng
2016, 42(11): 5-9. doi: 10.13272/j.issn.1671-251x.2016.11.002
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Abstract:
In view of the defect of long monitoring period, low monitoring precision and no realtime automatic monitoring existed in mine slope monitoring method, an online monitoring and early warning system of mining slope stability was designed, and design principle and structure of the system were introduced. The system can monitor change states of displacement field of rock slope in mining process, and can transmit the monitored data to host computer by wireless network, so as to realize visualization of monitoring data. The system also has early warning function, and can set warning threshold according to the need. The system can automaticly alarm when the slope displacement exceeds the warning threshold. The practical application proves reliability of the system.
Underground personnel and equipment location system based on iBeacon technology
ZHANG Hang, SUN Xiaoyu, TIAN Fengliang
2016, 42(11): 9-13. doi: 10.13272/j.issn.1671-251x.2016.11.003
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Abstract:
In order to solve the positioning problem of underground personnel and equipment, positioning principles and algorithms of iBeacon indoor positioning technology were deeply analyzed, and a design scheme of underground personnel and equipment location system based on iBeacon technology was put forward. At the same time, the system architecture, beacon layout, mobile App development were introduced. Applying iBeacon technology to underground personnel and equipment positioning has advantages of high positioning precision, easy deployment and quick navigation.
Mathematical model of automatic following control in the middle of fully mechanized mining face
SHI Yong, LIN Jiang, CUI Zhifang, YUAN Xiaoqin
2016, 42(11): 14-19. doi: 10.13272/j.issn.1671-251x.2016.11.004
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Abstract:
With consideration of bi-directional cutting characteristics of fully mechanized mining face and analysis of coordinated control of shear, hydraulic support and scraper conveyor, a mathematical model was firstly proposed to describe curved path of scraper conveyor according to formation principle of curved route when scraper conveyor was working during the mining production. Based on the model, working process of automatic following technology of hydraulic support in the middle of fully mechanized mining face was analyzed and a mathematical model of automatic following control in the middle of fully mechanized mining face was further built. Parameters of 3107 work face of a coal mine were calculated according to the mathematical model of automatic following control, and experiences during real production were concluded. The application result shows the model of automatic following control has a good coincidence with the actual following technique in working process, which can provide a theoretical basis for further realization of intelligent mechanized mining face.
Design of mine-used intrinsically safe remote relay power supply
LIN yi
2016, 42(11): 19-22. doi: 10.13272/j.issn.1671-251x.2016.11.005
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Abstract:
In order to satisfy long-distance transmission requirements of sensor used on underground super long working face, a mine-used intrinsically safe remote relay power supply was designed. Parallel connecting a mine-used intrinsically safe remote relay power supply between the sensor and intrinsically safe power supply can compensate differential pressure on power supply cable of single 24 V power supply, and extend power supply distance. The test results show that the relay power supply can make power supply distance of 24 V intrinsically safe power supply extend at least 2 km, and has small start current, stable output voltage and high performance to price ratio.
Design of multi-service gateway system for mine integration dispatching communicatio
GU Jun, LIU Yabing
2016, 42(11): 22-27. doi: 10.13272/j.issn.1671-251x.2016.11.006
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Abstract:
In view of problem that some mine communication systems cannot connect with service platform of mine integration dispatching communication system, a design scheme of multi-service gateway system for mine integration dispatching communication based on SIP protocol and standard media format was proposed. Overall architecture of the system and designs of communication flow and control processing of gateway services of IP broadcast, text message and industrial video were described. The test results show that the design scheme is a good support for implementation of whole mine integration dispatching communication.
Research of intelligentized coal mining mode and key technologies
TIAN Chengji
2016, 42(11): 28-32.
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Abstract:
In view of ambiguous status of concept, mode and key technologies of intelligentized coal mining, the paper briefly described concept and difference of unmanned technologies, intelligentized technologies and digitization technologies. In combination with the development course and technological means revolution of coal mining technologies, it put forward two kinds of technology mode of intelligentized coal mining ,namely one is the intelligent self-adaptive mining technology mode, the other one is technology mode of working face automation + visual remote intervention half mode intelligent drilling. It also respectively analyzed and researched key technologies of the two kinds of coal mining technology mode. The research results show that the two kinds of technology mode can realize intelligentized mining and meet the demands of practical application， its development trend is crossing and paralleling development in the future, so as to realize intelligent control on coal mining face.
Research of security resource allocation model of coal mine production logistics system based on maximum information entropy
JIA Yibo, DU Xueke, WANG Jinfeng, FENG Lijie
2016, 42(11): 33-37. doi: 10.13272/j.issn.1671-251x.2016.11.008
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Abstract:
According to characteristics of dynamic time sequence, complexity and uncertainty of coal mine production logistics system, security resources index system of coal mine production logistics system was determined that fully considered objective factors of various subsystems of the coal mine production logistics system, and security resources index was quantitatively calculated and analyzed by information entropy method. The safety resource allocation model based on maximum information entropy was built, and the optimization allocation problem of security resources was studied. Application results of example show that transportation subsystem and drainage subsystem belong to focus on increasing security resources investment, and mining subsystem and ventilation subsystem belong to cut safety resource investment. The safety resource allocation based on maximum information entropy method can provide theoretical support for improving level of coal mine safety production and optimizing coal mine security resource allocation.
Compressed sensing image processing algorithm of underground coal mine
YIN Zhu, HUANG Yourui, CHEN Zhenping
2016, 42(11): 38-41. doi: 10.13272/j.issn.1671-251x.2016.11.009
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Abstract:
In view of the problem that energy consumption of sensor nodes is fast and equipment life is cut caused by large amount of information transmission of wireless sensor network, a kind of compressed sensing image processing algorithm based on wavelet transform was put forward. The algorithm uses sym8 wavelet for image sparse and fragmental processing, and uses measurement matrix for adaptive sampling measurement, and finally reconstructs image through OMP algorithm and wavelet inverse transformation. The experimental results show that the proposed algorithm can obtain reconstructed image with high quality by lower sampling rate compared with traditional compressed sensing algorithm.
Simulation analysis of optimal regulation and control of ventilation system based on 3D model
HE Min, WU Fusheng
2016, 42(11): 41-44. doi: 10.13272/j.issn.1671-251x.2016.11.010
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Abstract:
A real 3D model of mine ventilation system was built by VENTSIM 3D ventilation dynamic simulation system taking a coal mine as research object. On the basis of obtaining reliable basic ventilation parameters, an accurate simulation of optimal regulation and control scheme of the ventilation system was made. The actual measurement results are in good agreement with the simulation results, and error is very small, so it verified the reliability of optimal regulation and control scheme of ventilation system based on 3D model.
A new type of single-phase grounding fault line selection and location method for mine distribution network
ZONG Weilin, XU Wenqiang, YUAN Yalei, DAI Jingwei, PI Jie, SONG Tianbao
2016, 42(11): 45-50. doi: 10.13272/j.issn.1671-251x.2016.11.011
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Abstract:
Characteristics of mine distribution network and difficulties of singlephase grounding fault line selection and location were analyzed. A new type of singlephase grounding fault line selection and location method for mine distribution network was proposed which was based on intermediate frequency signal injecting type. Through monitoring device of mine distribution network to detect fault occurrence time, intermediate frequency signal injecting device starts to inject intermediate frequency signal at the same time. Fault line selection and fault location are realized by analyzing power frequency fault signal and the intermediate frequency fault signal when distribution network parameters are known. Through Matlab/Simulink modeling, simulation analysis and corresponding data analysis and calculation, feasibility and correctness of the method are verified.
Online cable fault ranging method by double-end traveling wave for underground distribution network
ZHAO Min, SHANG Penghui
2016, 42(11): 50-55. doi: 10.13272/j.issn.1671-251x.2016.11.012
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In order to solve problems of block overlap of frequency bands in cable fault ranging method based on empirical mode decomposition and effect of residual white noise in the one based on ensemble empirical mode decomposition, an online cable fault ranging method by doubleend traveling wave for underground distribution network was proposed which was based on complementary ensemble empirical mode decomposition (CEEMD). The method extracts intrinsic mode function of line model components of doubleend fault traveling wave by CEEMD, and uses singularity detection principle based on instantaneous frequency mutation and modulus maxima to demarcate the wave head, so as to realize fault location. A 6 kV underground distribution network model was built in PSCAD/EMTDC software which was based on frequency characteristic of cable line. The simulation result shows the method has high ranging precision, and the max ranging error is no more than 4%.
Design of emergency speed regulation system of coal mine moter
RUAN Wentao
2016, 42(11): 55-58. doi: 10.13272/j.issn.1671-251x.2016.11.013
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Abstract:
In view of problem that it is difficult to recover normal operation in a short time when frequency converter fails, emergency speed regulation system of coal mine moter was designed. The system uses emergency frequency conversion device to replace the failed frequency converter to control motor: when the original frequency converter fails, PLC main control unit controls emergency frequency conversion device in real time according to fault state of the motor and the frequency converter; when output of the emergency frequency conversion device reaches operating condition of the motor, switching device acts immediately, so as to realize stable control of motor speed. The simulation results show that the system can quickly access the emergency frequency conversion device when original converter fails, and has good speed regulation performance.
Study on fault diagnosis of three-phase four-switch active power filters
ZHANG Man, WANG Tao, LI Zhixi
2016, 42(11): 59-63. doi: 10.13272/j.issn.1671-251x.2016.11.014
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Abstract:
In order to solve problem of fault diagnosis of IGBT open-circuit of three-phase four-switch active power filter system, a fault diagnosis method of IGBT open-circuit based on voltage detection was put forward. This method only need to sample a line voltage signal, and combines with current and IGBT switching signals detected by system controllers, then it can quickly and accurately diagnose failure and determine the fault location. Meanwhile, the diagnosis method is suitable for IGBT open-circuit fault diagnosis of single tube and multi-ube. The simulation and experimental results verify the validity and reliability of the diagnosis method.
Research on remote data transmission system of underground electric drive scraper
ZHANG Xiao, LUO Weidong
2016, 42(11): 64-66. doi: 10.13272/j.issn.1671-251x.2016.11.015
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In view of problem that a large amount of realtime data will be generated during operation of electric drive system, remote data transmission system of underground electric drive scraper was studied. The system uses distributed CAN bus to realize industrial field data transmission and operation data collection of scraper, takes wireless communication network as transmission channel, adopts principle of TCP/IP asynchronous transmission, and realizes onboard data remote transmission by onboard client subsystem and server subsystem.
Software defect management of electro hydraulic control system of hydraulic support
NIU Jianfeng, BAI Yongsheng, GUO Dinghe
2016, 42(11): 67-71. doi: 10.13272/j.issn.1671-251x.2016.11.016
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For software defect problem of electro hydraulic control system of hydraulic support, software structural features of the electro-hydraulic control system were analyzed from software testing method, software defect management framework was built, software testing schema was determined, and database structure of software defects database and software defect management flow were designed, so as to analyze software. The application shows that software quality and development efficiency of the electro-hydraulic control system are improved through software defect management.
A design method of mine-used sound box
TIAN Ju
2016, 42(11): 71-73. doi: 10.13272/j.issn.1671-251x.2016.11.017
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A design method of mine-used sound box was introduced. A selection method of loudspeaker in mine-used sound box was introduced firstly from aspects of three parameters of frequency characteristics, distortion degree and impedance. Then cavity volume of mine-used sound box was calculated by taking balanced frequency response as a design goal. Finally, structures of size and material of mine-used sound box were designed.
Design of laser alignment sensor for alignment of hydraulic supports on working face
ZHAO Shimin, LIU Qing
2016, 42(11): 74-77. doi: 10.13272/j.issn.1671-251x.2016.11.018
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In order to satisfy continuous coal mining requirements of coal-cutter following automation on coal mining face, a laser alignment sensor for alignment of hydraulic supports on working face was designed. Alignment principle based on laser alignment sensor and hardware and software designs were introduced. The sensor uses miniaturization design, and has advantages of easy installation, low price and so on. The results of underground industrial experiments show that average alignment precision of adjacent hydraulic supports can reach 30 mm while applying the sensor to automatic coal mining.
Design of a novel fast turn-off circuit of transient electromagnetic transmitter
WANG Guangjun, MIN Deshun
2016, 42(11): 77-80. doi: 10.13272/j.issn.1671-251x.2016.11.019
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In view of problem that turn-off time of emission current of transient electromagnetic transmitter is overlong caused by parasitic inductance of the transmitter coils, a novel fast turn-off circuit was designed. During the decline of transmitting current, the fast turn-off circuit uses transistors to provide an additional new discharge circuit, which takes advantages of its large resistance and low discharge time constant to realize quick turn-off of the transmitting current. The results of simulation and experiment show that the novel circuit can decrease the turn-off time of transient electromagnetic transmitter effectively with high stability.
Development of integrated intelligent backup power supply
CHEN Xiangyua
2016, 42(11): 81-84. doi: 10.13272/j.issn.1671-251x.2016.11.020
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In view of problems of low power supply reliability, poor anti-interference ability and inconvenient extension of backup battery capacity existed in coal mine underground distributed power supply, an integrated intelligent back-up power supply was developed, working principle and composition of the power supply were introduced in detail. The power supply has strong anti-interference capability, rapid diagnosis, rapid positioning function for over voltage, over current, short circuit fault .The power supply can prevent battery discharge, and provides reliable, economic, safe and uninterrupted power supply for all kinds of digital mine system.

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