2013 Vol. 39, No. 3

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Modern mine communication technology and system
SUN Ji-ping
2013, 39(3): 1-5.
<Abstract>(55) <PDF>(16)
Abstract:
The paper proposed coal mine communication technology system which was consisted of mine wired dispatching communication system, mine mobile communication system, mine broadcast communication system and mine rescue communication system. It proposed that mine dispatching communication system should use mine wired dispatching communication system. It proposed that all mine mobile communication system should use communication technologies such as WiFi, 3G and 4G. It proposed that mine broadcast communication system can use either remote powered broadcast technology of mine wired dispatching communication system, or IP communication technology based on Ethernet and passive optical network. It proposed that mine rescue communication system should use wireless multimedia communication technology, and should use communication technologies such as WiFi and MESH. It proposed that mine mobile communication system should meet the demand for mobile phone off network, base station off network, access of coal mine wired broadband transmission platform. It pointed out that WiFi is superior to WCDMA, CDMA2000 and TD-SCDMA for communication of mobile phone off network, access of coal mine wired broadband transmission platform, wireless ad hoc networks, mine-used wireless camera, communication of base station off network, multifunction mine mobile communication system and mine wireless broadband transmission. It proposed that WiFi should be used for multifunction mine mobile communication system and mine wireless broadband transmission.
Research of architecture of coal mine safety monitoring and control system in the environment of Internet of Things
HUA Gang, SONG Zhi-yue, WANG Yong-xing, XU Yong-gang, WAN Zi-yan
2013, 39(3): 6-9.
<Abstract>(25) <PDF>(5)
Abstract:
The paper analyzed problems of traditional coal mine safety monitoring and control system, studied on structure, performance, working principle, layered architecture and key technologies of coal mine safety monitoring and control system in the environment of Internet of Things. It described changes of main components of the system and concept and significance of logical substation, and pointed out that there were many issues need to be addressed such as developments of new procedures, standards and sensors with low-power consumption to realize coal mine Internet of Things.
Design of mine-used wireless communication and personnel positioning management system
SHAO Guo-qiang
2013, 39(3): 10-12.
<Abstract>(55) <PDF>(5)
Abstract:
For problem of duplication of network deployment of common WiFi communication system and personnel positioning system which both adopt independent network deployment, the paper proposed a design scheme of integrated mine-used wireless communication and personnel positioning system combining WiFi with RFID. The system realizes functions of wireless communication and personnel positioning through integrated base station, achieves integrated transmission of voice, data and image. The practical application results show that the integrated base station can complete mobile communication and card reading function which reduces investment, and the system is easy to maintain and manage.
Design of Android visual voice communication terminal of coal mine underground
LUO Ke, BAO Jian-jun, JIANG Hua, XU Shou-qua
2013, 39(3): 13-16.
<Abstract>(43) <PDF>(7)
Abstract:
A novel visual voice communication terminal based on low power ARM Cortex-A8 kernel used in coal mine underground was proposed. The functions, hardware composition and software architecture of the terminal were discussed. SIP protocol combined with voice/video encoder/decoder were implemented on Android operating system to realize visual voice communication. The experimental results show that the overall power consumption of the terminal can be controlled in 20 W, which can achieve intrinsically safe design; the CPU load is very light during voice communication, while the CPU average utilization rate can be kept below 50% during video compression and display, which meets the visual intercom demand.
Research of echo cancellation technology in mine-used IP broadcast and talkback system
WANG Shu-qiang, ZHANG Ping, CHEN Shao-hua
2013, 39(3): 17-19.
<Abstract>(34) <PDF>(5)
Abstract:
The paper analyzed echo path of mine-used IP broadcast and talkback system, pointed out that the echo has complex sources, long path delay and large path delay jitter. It proposed a scheme of using software algorithm to eliminate echo in radio host, and using combination of structure design and hardware design to eliminate echo in broadcasting terminal. The practical application shows that the scheme of echo cancellation improves communication quality of mine-used IP broadcast and talkback system, and full-duplex loud-speak and talkback of the system has good effect.
Design of universal wireless data monitoring model
LI Wei, XU Qiang, XU Kai
2013, 39(3): 20-23.
<Abstract>(42) <PDF>(5)
Abstract:
For the problem that most existing wireless data monitoring schemes are based on professional fields, have different data requirements, processing methods , safety standards, and high cost of development and application, the paper proposed a design scheme of universal wireless data monitoring model, and introduced overall design of the model and implementation of key technologies. The model uses STC89C52RC as master chip; adopts universal integrated wireless transmission module to transmit and receive data through radio frequency chip nRF24L01; bus module uses RS232 serial data communication method. The test results show that the power of data monitoring module of scene node and the regional dataset module are 8.58 mW and 29.7 mW, transceiver distance of the model is longer than 30 m, which is able to complete reliable and stable wireless data communication.
Research of application of soft starter in high cutting coal mining face
MIAO Ji-jun, ZHAO Li-jie, WANG Jun-wei
2013, 39(3): 23-26.
<Abstract>(32) <PDF>(5)
Abstract:
The paper introduced power supply solution and equipments of high cutting coal mining face of Shenhua Wuhai Coal Group Co., Ltd., studied feasibility of application of soft starter in scraper conveyor, and analyzed electrical shock to mobile substation produced by starting of load of mining area. Using Matlab/Simulink software to create a mining area power supply system model and analyze start performance of soft starter, adopting current-limiting start mode at light load and frequency conversion start mode at overload, the simulation results show that the soft starter can effectively reduce electrical shock of starting of electrical equipments.
Design of WSN gateway for coal mine safety monitoring system
ZHOU Jian-he
2013, 39(3): 26-30.
<Abstract>(44) <PDF>(4)
Abstract:
In order to meet the needs of heterogeneous interconnection between Ethernet of coal mine and underground ZigBee WSN, the paper proposed a design scheme of WSN gateway for coal mine safety monitoring system. It introduced design points of system software and hardware frameworks, and extended operating system abstraction layer of ZigBee protocol stack Z-Stack without transplanting additional new kernel to meet real-time requirements of tasks of embedded gateway system. The test results show that the gateway implements communication protocols conversion functions between Ethernet and ZigBee WSN, which ensures real-time performance and reliability of data forwarding.
Design of direct gas chamber of infrared methane sensor
LIU Gang, LIANG Ting, HUAN Tao, LIU Jun
2013, 39(3): 31-35.
<Abstract>(68) <PDF>(7)
Abstract:
For problem of large measurement error of infrared methane sensor with reflective gas chamber, a new direct gas chamber was designed based on spectrum absorption principle of infrared light and non-spectroscopic detection technology. The infrared gas chamber achieves detection of volume fraction of methane gas by using external circuits combined with silicon semiconductor chip infrared light source, dual-channel infrared detector and midplane of gas chamber with certain length, and choosing GaF2 as window material of the light source and the detector. The test results show that the largest measurement error of the infrared methane sensor with direct gas chamber is only ±0.05% in the CH4 volume fraction range of 0～2.5%.
Development of a new type of smart charger for mine-used lead-acid battery
ZHANG Quan-zhu, ZHANG Fei-ping, PEI Cui-ling, DENG Yong-hong
2013, 39(3): 35-39.
<Abstract>(62) <PDF>(2)
Abstract:
For problems of bulky, low charging efficiency, low input power factor and so on of traditional charger for mine-used lead-acid battery, a new type of smart charger was developed. The charger is composed of multi-link voltage power units, achieves continuous and adjustable transformation from input three-phase AC voltage with two standards to DC voltage of 0-300 V and current of 0-120 A through phase shift control of square wave pulse of IGBT inverter. Experimental results show that the charger achieves three-stage operating mode from constant current to constant voltage and then to float charging, the voltage and current are relatively stable; electrolyte density reaction of the battery group is stable without bubbles, and the temperature do not change obviously in the charging process.
Application of virtual reality teaching means in special operators training of coal mines
TIAN Zi-jia
2013, 39(3): 40-42.
<Abstract>(56) <PDF>(3)
Abstract:
The current two causes of poor train quality of coal special operators were analyzed. It was indicated that the main cause of ineffective training of coal special operators was backwardness of training means. The defect of training and teaching software which was developed with traditional virtual reality technology was analyzed. The characteristics of virtual reality technology development platform based on three-dimensional geographic information system were introduced. The advantages of training software for special operators based on 3DGIS were analyzed. A new idea to improve the quality of safety training for coal special operators was provided by the virtual reality teaching means.
Influence of wall roughness on electromagnetic wave propagation in coal mine tunnels
HUO Yu, ANG Mi-mi, LIU Feng-xue, XU Zhao
2013, 39(3): 43-45.
<Abstract>(79) <PDF>(3)
Abstract:
The paper deduced formula of electromagnetic wave attenuation caused by wall roughness under combined effects of multi wave mode according to transmission theory of multi wave mode, and simulated and analyzed effect of wall roughness on attenuation characteristics of electromagnetic wave by multi mode model. Matlab simulation results show that influence of wall roughness on attenuation characteristic increases with frequency. Due to combined effects of waveguide and wall roughness, there is a frequency range with low attenuation of 0.4-2 GHz in wave propagation in coal mine tunnels.
Research of coal mine safety monitoring and early warning system based on cloud computing
LI Hao-min, LU Jian-jun, WEI Che
2013, 39(3): 46-49.
<Abstract>(53) <PDF>(4)
Abstract:
For problem that traditional coal mine safety monitoring system cannot predict underground accidents in advance, the paper proposed a coal mine safety monitoring and early warning system based on cloud computing．It introduced related technologies including cloud computing, SaaS and data mining, and described design of overall architecture and cloud data center of the system in details. The system can effectively forecast underground gas accident, mechanical and electrical accident, fire accident, water damage accident, so as to reduce risk of security incidents.
Knowledge acquisition approach based on rough sets theory for gas forecast expert system of coal mine
WANG Ling
2013, 39(3): 49-52.
<Abstract>(43) <PDF>(2)
Abstract:
For problem of poor forecast effect of existing gas forecast expert system of coal mine because of no new knowledge acquisition measures and self-renewal function for knowledge, a knowledge acquisition approach based on rough sets theory was proposed. The method firstly establishes forecast samples of relationship between gas data and gas outburst intensity; then uses algorithms of continuous attribute discretization, attribute reduction and rules extraction based on rough sets theory to obtain forecast knowledge from lots of forecast samples, and stores the knowledge in knowledge database of expert system; finally, realizes real-time gas forecast based on reasoning machine. Example analysis result verifies effectiveness and practicality of rough set method applied in knowledge acquisition of gas forecast expert system of coal mine.
Research on application of voltage compensation in frequency-conversion speed-regulation system
ZHU Gao-zhong
2013, 39(3): 53-56.
<Abstract>(45) <PDF>(3)
Abstract:
For problem that asynchronous motor has inadequate starting torque with heavy load during low-frequency starting under control strategy of constant proportion of voltage to frequency, the paper proposed to use voltage compensation measure to improve carrying capacity of motor in cycloconverter-fed frequency-conversion speed-regulation system. It introduced voltage compensation principle and calculation of compensation values, and compared spectrum, speed and torque with and without voltage compensation, and different voltage compensation effects of the motor with different loads. The simulation results show that the voltage compensation has good compensation effect in the frequency-conversion speed-regulation system: ① The stator output voltage has high harmonic content, the waveform has good symmetry, and motor has strong load capacity under voltage compensation. ② The greater the motor load is, the slower its rotational speed becomes, but the starting torque remains unchanged, and the speed decline maintains substantially constant.
Research of fault line selection method for small current grounding system based on multi-source information fusio
HE Jin-peng, TIAN Shu, YANG Xin-ping
2013, 39(3): 56-60.
<Abstract>(94) <PDF>(3)
Abstract:
In view of problem of difficult fault line selection for small current grounding system, the paper proposed a fault line selection method for small current grounding system based on multi-source information fusion. Taking fault line set, fault characteristics set of each line and amount domain regulated by fault characteristics of each line as three elements of matter element of extension fusion, taking size of fault angle as weight, the method effectively fuse energy line selection method with accurate line selection under small fault angle and wavelet packet line selection method with accurate line selection under big fault angle, so as to realize accurate line selection combining with reclosing technology. The simulation result validates effectiveness and reasonableness of the method.
Application of improved BP neural network in fault detection of mine ventilation system
ZHANG Fei, HE Ya-qin, ZHANG Ke
2013, 39(3): 61-63.
<Abstract>(38) <PDF>(2)
Abstract:
For problem that step of traditional learning algorithm of BP neural network is difficult to determine, the paper proposed a method of using BP neural network based on RLS algorithm to detect fault of mine ventilation system. It introduced structure of the BP neural network briefly, and introduced RLS learning algorithm and simulation process in details. The simulation results show that the BP neural network with RLS algorithm can meet the requirements of fault detection of mine ventilation system.
Grounding fault line selection method of power system of coal mine based on fuzzy theory
YANG Yan, ZANG Qi-wei, YU Yang, LIANG Pei-ra
2013, 39(3): 64-68.
<Abstract>(51) <PDF>(3)
Abstract:
For problem that fail selection often happened in single grounding fault line selection method, a new method combining zero sequence current power direction principle, wavelet transform analysis principle and gray relational analysis principle was proposed. The method uses the zero-sequence voltage multifractal spectrum to determine weights of the methods, and uses fuzzy inference theory for multi-criteria information fusion. Matlab simulation results show that the compound criterion which determines the weight through positioning method is suitable for single-phase grounding fault line selection in a variety of circumstances, and is not affected by system neutral grounding mode, run mode, out line number and grounding position, which achieves high accuracy single-phase grounding fault location.
Research of power balance control for multi-motor frequency-conversion drive of belt conveyor
YU Fa-shan, HAN Chao-chao, TIAN Xi-fang, LOU Hui-ming
2013, 39(3): 69-73.
<Abstract>(38) <PDF>(3)
Abstract:
For problems of motor overload and even damaged caused by power unbalance which easily appears in processes of load changing, acceleration and deceleration of multi-motor drive for belt conveyor, a torque distribution formula of motor was deduced according to torque distribution principle. Master-slave control method of frequency-conversion drive was adopted, namely vector control with closed loop of speed and magnetic chain was used for the master motor and speed cascade torque control was used for the slave motor, so torque closed-loop control was done under the case that torque distribution of the master and slave motor were given. Model of power balance control system was established and the structure of dual-motor drive power balance control system was given. The result of Matlab simulation shows that output torques of the motors can achieve proportional distribution in processes of load changing, acceleration and deceleration, which proves effectiveness of the power balance control system.
Research of STATCOM control strategy under underground unbalanced conditio
TANG Xia, PENG Zhi-yu, WANG Sha-sha, HAN Li
2013, 39(3): 73-77.
<Abstract>(52) <PDF>(2)
Abstract:
For problem that underground unbalanced condition will result in poor control performance of STATCOM, affecting compensation effect, the paper proposed a control strategy adopting improved switch function method and negative sequence voltage feedforward, made the STATCOM issue a negative sequence voltage whose magnitude and phase are equal to negative sequence voltage of the system to compensate for the negative sequence voltage of the system, so as to ensure normal operation of STATCOM under unbalanced condition. Simulation results show that the control strategy can inhibit negative sequence current, and effectively overcome impact of three-phase unbalance.
Study of application of harmonic detection algorithm with improved unit power factor in three-phase shunt APF
LI Xiao-fan, XU Chun-yu
2013, 39(3): 78-82.
<Abstract>(35) <PDF>(2)
Abstract:
In order to reduce impact of grid voltage asymmetry or distortion on UPF harmonic detection algorithm, an improved UPF harmonic detection algorithm introducing PLL circuit was used to produce fundamental positive sequence voltage and correct active power, which inhibited impact of voltage distortion, while improved real-time performance of detection. Current waveforms of the power supply side before and after the compensation were compared by Matlab, which verifies feasibility of the improved algorithm. Experimental results show that harmonic content of the fifth harmonic which has the highest harmonic content is reduced from 22.8% before the compensation to 8.1% after the compensation by the improved algorithm, and the main harmonic component of the load current has been effectively inhibited, which achieves purpose of harmonic suppression.
Design of mine-used digital broadcasting system
QIAN Jian-sheng, LI Shuang-shuang, ZUO Man-man, ZHAO Jun-yi, LI Jun-hong
2013, 39(3): 83-84.
<Abstract>(51) <PDF>(5)
Abstract:
For problems that underground broadcasting system with analog audio broadcasting mode has poor flexibility and small voice communication range, the paper proposed design scheme of a new kind of mine-used digital broadcasting system, introduced designs of overall structure of the system, audio terminal and gateway program. The system accesses the audio terminal in industrial Ethernet, realizes packet and designated broadcasting, which solves problems of underground unicast and multicast.
Fault analysis of leakage protection of smart low-voltage feed switch and its reformatio
GUAN Zhen-xiang, WANG Guang-sheng, JIANG Tao, LIU Shi-gang, ZHAI Dong, FAN Xin-liu
2013, 39(3): 85-88.
<Abstract>(128) <PDF>(3)
Abstract:
For faults in leakage protection of smart low-voltage feed switch of Nantun Coal Mine, the paper analyzed leakage protection principle and causes of the faults, and proposed reformation schemes: increase zero sequence current by additional capacitance at the master switch, so that integrated protector can be used for acquisition and judgment, and sub switch of the leakage branch can operate reliably; connect a circuit breaker auxiliary contact normally closed in series in leakage detection circuit of sub switch, so that detection circuit based on additional DC power principle can be cut off completely after closing of the sub switch to eliminate interference to leakage detection of master switch. Field application results show that the improved leakage protection of the low-voltage power supply system operates normally, leakage action time is shortened from 2 s to less than 250 ms, and the leakage protection of sub switch acts sensitively and reliably.
Design of underground elevation drilling logging system
ZHOU Yang, GUO Jia-hu, LI Meng, ZHOU Qi
2013, 39(3): 88-91.
<Abstract>(28) <PDF>(2)
Abstract:
For problems of low bus utilization and low data transfer rate and so on existed in traditional logging system, a design scheme of underground elevation drilling logging system was proposed, and the system structure, network topology, and design of hardware and software of the probe node with PIC18LF4680 as core were described. The system uses file management control chip for data management, achieves two logging ways of having cable and non-cable. The practical application shows that the system is stable and is applicable for measurement of mine production conditions.
Application of local cooling technology in deep mining of Xuzhuang Coal Mine
FENG De-qing, ZHAO Xiang-dong, CHEN Zhou
2013, 39(3): 92-97.
<Abstract>(48) <PDF>(2)
Abstract:
The paper analyzed heat disaster status of local region in deep mining of Xuzhuang Coal Mine and design requirements of underground local refrigeration cooling system. It proposed local mobile and mechanical refrigeration cooling method which is suitable for Xuzhuang Coal Mine：use closed-loop water system, and use two TS-300B underground refrigeration devices for refrigeration cooling of -750 west track roadway and belt transportation roadway respectively. It introduced design scheme, testing result of cooling effect and benefit analysis of refrigeration cooling system. Field application result shows that the system has greatly improved underground work environment, attendance and productivity of workers in high-temperature conditions, but there are still issues that heat exhaust of the refrigeration device is easily affected by environment, spray water of condenser has great loss and so on.
Design of intelligent control system for vehicle cooling fa
ZHA Bing
2013, 39(3): 98-100.
<Abstract>(33) <PDF>(2)
Abstract:
In order to improve performance of vehicle engine cooling system, the paper proposed a design scheme of intelligent control system for vehicle cooling fan combined with new vehicle network bus technology of FlexRay. The system uses multi-parameter composite linear control signal, namely collects temperature data of the cooling system and working state parameters of the engine, and sends them to MCU for integrated treatment, then MCU outputs PWM control signal. It achieves real-time and efficient control for the cooling fan. The test results show that the system is able to achieve data reading and writing and transmission among multi-node with high real-time performance, reliability and accuracy.
Design of a new type of signal converter of coal mine safety monitoring and control system
WANG Hong-yao
2013, 39(3): 100-104.
<Abstract>(58) <PDF>(3)
Abstract:
For problem that current coal mine safety monitoring and control system still uses master-slave response communication mode, which is unable to achieve multi-master concurrency of substation, real-time communication and jointed control between substations, the paper proposed a design scheme of a new type of signal converter of coal mine safety monitoring and control system. It gave structure model of monitoring and control system with polycyclic and peer to peer communication, and introduced designs of software and hardware of signal converter in details. The test results show that the substation can easily achieve multi-master concurrency and online expansion through the signal converter, peer to peer communication and control between the substations can be achieved without scheduling of host computer, which effectively shortens response time of the control of the system in hazardous areas and improves reliability of network structure.
Application and improvement of differential pressure densimeter in coal preparation plant
MAO Dong-mei
2013, 39(3): 105-108.
<Abstract>(77) <PDF>(2)
Abstract:
For problem of zero drift of differential pressure densimeter which is susceptible to installation location and fluctuations of measured fluid, bypass installation pipes of differential pressure densimeter was designed and improved, and effect was significant for reducing error caused by shock, preventing clogging of pipelines and advancing service life of diaphragm; digital smoothing filtering algorithm for filtering processing of collected signals was proposed, which improved stability of differential pressure densimeter on the premise that it did not affect measurement accuracy. The practical application results show that the improved differential pressure densimeter can meet requirements of practical application on respects of reliability, stability and accuracy.
Design of integrated monitoring device for scraper conveyor
WANG Ai-ming, LI Guo-ping, LI Yu-chun, MENG Guo-ying, PANG Zheng-duo
2013, 39(3): 108-110.
<Abstract>(49) <PDF>(3)
Abstract:
A design scheme of integrated monitoring device for scraper conveyor was proposed, and designs of structure, functions, hardware and software of the device were introduced. The device takes single-chip microcomputer ATmeg128 as core, achieves monitoring of oil temperature and level of reducer, water pressure and flow of cooling water, motor winding temperature, and function of tail stretching monitoring.
Design of intelligent path detector for electrified cable
LI Zhong-hu, XIONG Zhi-we
2013, 39(3): 111-113.
<Abstract>(53) <PDF>(4)
Abstract:
The paper introduced implementation of an intelligent path detector for electrified cable with AVR single-chip microcomputer as core. The path detector provides two operating modes of specific frequency detection and unknown frequency search for two cases of signal frequency known or unknown respectively, and determines position of the cables according to induced electromotive force generated by the coil, thus realizes detection of underground cable path without affecting normal working of the cable.
Design of mine environmental data acquisition equipment based on wireless ad hoc networks
XIE Jia-xing, WU Ze-tao, XIE Zhen-he, SHI Jian-zhu, WU Guan-hui, LUO Jia-wei
2013, 39(3): 114-116.
<Abstract>(91) <PDF>(3)
Abstract:
For status that most coal mine safety monitoring and control systems adopt fixed and wired sensor network which has blind spots, the paper proposed a design scheme of mine environmental data acquisition equipment based on wireless ad hoc networks, and introduced design of low-power wireless ad hoc networks in details. The equipment takes ATmega16L signle-chip microcomputer as master chip, achieves wireless transceiver by RF transceiver chip NRF24L01, and uses planar network topology and on-demand routing mode. It realizes collection of mine environmental data and early warning, reduces monitoring blind spots, and has higher security and reliability.
Design of video supervision system for thin seam
HU Yang, CHEN Zhuo, GONG Fu-zhang, HOU Liang, ZHANG Qiang
2013, 39(3): 117-118.
<Abstract>(64) <PDF>(2)
Abstract:
Video supervision system was designed according to characteristics of working face of thin seam, and overall design and design of hardware and software were introduced. The system achieves real-time monitoring of working face of thin seam, and has stable performance, clear images, smooth video and short communication delay, which will greatly improve mining efficiency and reduce labor intensity.

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