工矿自动化

Characteristics of coal mine accidents and new technologies of coal mine communication, personnel positioning and monitoring

SUN Jiping

2015, 41(2): 1-5. doi: 10.13272/j.issn.1671-251x.2015.02.001

<Abstract>(64) <PDF>(7)

Abstract:
The paper analyzed characteristics of gas, water and roof accidents of coal mine during 2009-2013, obtained numbers of accidents and deaths accounted for 78.54% and 78.80% respectively at mining working face of the most accidents. It put forward mobile communication, broadcast communication and rescue communication system should not be used as mine emergency communication system, and through-the-earth communication system could be used as mine emergency communication system with low performance-price ratio. It proposed wired dispatching communication system used as mine emergency communication system has advantage of high performance-price ratio. In the wired dispatching communication system, cable should be buried under laneway sidewall crossover with roadway floor, underground telephone should be set in chamber with stronger protection, and cable joint should be reduced and waterproof performance of the cable joint should be improved. It analyzed problems of wisdom line communication in underground coal mine, which include short transmission distance without repeater, power supply distance restricted by intrinsic safety and explosion-proof, easily occurs short-circuit fault, and it cannot be used for backbone transmission with large capacity and its outer sheath is not resistant to explosion.

Design of mine-used mobile security management system

LUO Ke, DU Zhigang, BAO Jianjun, WANG Wei

2015, 41(2): 6-9. doi: 10.13272/j.issn.1671-251x.2015.02.002

<Abstract>(64) <PDF>(3)

Abstract:
In view of problem that main functions of existing system of coal mine were localized in the PC terminal, the paper proposed a design scheme of mine-used mobile security management system based on Android operating system. It mainly discussed system architecture, function design and database design. The system can be a good access to personnel positioning, monitoring and control, video surveillance, OA office system, etc. Trial operation result shows that the system has high reliability, perfect functions and user-friendly interface, which greatly facilitates the business office and meets the user needs.

Design of centralized control system for hydraulic supports on fully-mechanized coal mining face

ZHAO Long, SONG Jiancheng, TIAN Muqin, XU Chunyu, YANG Shihua, YU Yayun, DONG Guangzhuai, YIN Weibin, ZHAO Xudong

2015, 41(2): 9-13. doi: 10.13272/j.issn.1671-251x.2015.02.003

<Abstract>(32) <PDF>(2)

Abstract:
In view of problem of low automation degree of current electro-hydraulic control system for hydraulic supports, a centralized control system for hydraulic supports on fully-mechanized coal mining face was designed, designs of hardware and software of the system were introduced, and realizing process of centralized control for hydraulic supports was also expounded. The test results show that the system can realize centralized control of hydraulic supports, and has performances of stable field communication and high real-time, which can meet actual requirement of coal mine production.

Green cleaning system for remanufacturing of mine-used equipment

ZENG Qingliang, SU Xingming, WANG Chenglong, LI Shengwen, REN Yan

2015, 41(2): 14-17. doi: 10.13272/j.issn.1671-251x.2015.02.004

<Abstract>(43) <PDF>(3)

Abstract:
For cleaning technic during remanufacturing process of mine-used equipment, a specific cleaning technical process was proposed for mine-used equipment. A green cleaning system was established based on control core of PLC and ultrasonic cleaning mode. In addition, operation interface on touch screen was designed by configuration software. Field application of the system was introduced taking cleaning process of crankshafts of emulsion pump as an example. Practice shows that the system has advantages of high reliability, significant cleaning effect, low cleaning cost and few pollution of environment.

Design of a novel information exploration robot system for mine disaster

QIN Yuxin, DU Cuijie, WANG Hongqi, WANG Yuqing

2015, 41(2): 17-20. doi: 10.13272/j.issn.1671-251x.2015.02.005

<Abstract>(55) <PDF>(2)

Abstract:
For the problem that existing disaster rescuing robots cannot adapt to disaster environment of coal mine underground, a novel information exploration robot system for mine disaster was proposed. Distribution of the system in underground was introduced as well as designs of its structure and control system, and climbing ability of disaster rescuing robot in the system was analyzed. The robot moves along I-beam track of overhead monorail in underground and arrives disaster field quickly when disaster happens to collect and send image and environment information to command center on the ground. Test results in simulated coal mine roadway show that the system runs stably and transmits image clearly and continuously, and climbing angle of the robot is 18.5°.

Research of energy consumption model of robot in coal mine post-disaster environment

FANG Haifeng, ZHANG Lihua, LI Yunwang, CAI Lihua

2015, 41(2): 21-25. doi: 10.13272/j.issn.1671-251x.2015.02.006

<Abstract>(63) <PDF>(2)

Abstract:
For status that there was no research about energy consumption model of disaster rescuing robot in coal mine as well as influence factors on energy consumption efficiency, walking resistance of robot in coal mine post-disaster environment was analyzed and an energy consumption model of the robot was established, which was verified by a disaster rescuing robot prototype. Relationship among factors, such as endurance of the robot, road conditions, current and so on, was analyzed and solved. It was found that the robot would consume more energy while accelerating and turning, and energy consumed while walking on coal road was almost 2 times more than the one consumed while walking on concrete road.

Design of peak voltage absorption device of frequency-conversion speed-regulation for winch

LYU Fengxin, DU Peng, SU Liangcheng, YU Yuesen

2015, 41(2): 25-28. doi: 10.13272/j.issn.1671-251x.2015.02.007

<Abstract>(68) <PDF>(3)

Abstract:
In order to reduce influence of peak voltage of motor terminal pulse on the ground insulation of motor and ensure safe and stable operation of frequency-conversion winch, a peak voltage absorption device of frequency-conversion speed-regulation for winch was designed based on the principle of uniform transmission line model and absorption circuit. The device adopts principle of capacitor charging and discharging, and can effectively reduce peak voltage of motor terminal, prevent the motor insulation breakdown. The test results show that the device reduces output voltage change rate of inverter, reduces instantaneous peak of motor terminal, the peak is reduced from 2 820 V to 2 330 V, so the output peak voltage is controlled effectively.

Design of antenna of intrinsic safety wireless pressure sensor

LIU Xin, CHANG Qing

2015, 41(2): 29-31. doi: 10.13272/j.issn.1671-251x.2015.02.008

<Abstract>(85) <PDF>(6)

Abstract:
The paper proposed a design scheme of antenna structure of underground intrinsic safety wireless pressure sensor, and researched impact of opening parameters of metal shell and antenna position on antenna gain. The simulation and test results show that antenna gain increases with increase of length and width of metal shell opening, but increased amplitude gradually decreases; antenna gain increases with decrease of distance between antenna and opening; antenna gain increases about 2 dB when metal shell thickness of opening side reduces 1 mm; antenna gain changing caused by millimeter level changing of metal shell space height almost can be ignored; antenna gain achieves the best and antenna transmission distance is about 14 m when metal shell with length and width of opening are 1/4 and 1/8 of antenna wavelength respectively, thickness is 2 mm, space height is 41 mm, and distance between antenna and opening is 1.4 mm.

Research of application of cooperative communication to underground coal mine

WANG Tingting, XU Zhao, ZHANG Xiaoguang

2015, 41(2): 32-35. doi: 10.13272/j.issn.1671-251x.2015.02.009

<Abstract>(44) <PDF>(3)

Abstract:
In view of complex electromagnetic wave propagation environment and outstanding multipath effects in coal mine, major anti-multipath methods of mine wireless communication were analyzed. According to the characteristics of cooperative communication technology, cooperative communication was proposed to apply to mine WMN communication system, and mine C-WMN communication system architecture was given. On the basis of geometry characteristics of several typical environments in mine, the corresponding modes of cooperative relay of C-WMN were analyzed.

Reliability growth prediction of mine-used low-voltage switchgear

XIA Haoxuan, LIU Zixu, WANG Jingqin, YANG Chunwen, WANG Li

2015, 41(2): 36-39. doi: 10.13272/j.issn.1671-251x.2015.02.010

<Abstract>(23) <PDF>(3)

Abstract:
A mine low-voltage switchgear was taken as object to study its reliability growth process in the commissioning phase in underground coal mine. It was clarified that number of mine-used low-voltage switchgear failure occurrence accompanied with repair obeys non-homogeneous Poisson process according to Laplace hypothesis-testing theory and Bayes theory. The Bayes point and interval estimations for mean time between failures and failure intensity of synchronous time were presented taking the non-information priori distribution, and the actual data obtained in the commissioning phase was used to predict mean time between failures of the mine-used low-voltage switchgear to verify effectiveness of Bayes methods, which provided basis for finding of safety loophole of the switchgear.

Experimental study on frequency-conversion speed-regulation performance of mine-used wet scrubber

GUO Zhenxin, ZHAO Zhongtai, TAN Qiang, YIN Zhenbiao

2015, 41(2): 39-41. doi: 10.13272/j.issn.1671-251x.2015.02.011

<Abstract>(25) <PDF>(4)

Abstract:
In view of problem that continuous advancing of excavation working face results in decreasing of specific value of pressed and exhausted air volume in excavation roadway, and impacts dust control and collection effects of wet scrubber, frequency-conversion speed-regulation principle was introduced, and relations between air volume and frequency, air volume and power, dust collection efficiency and frequency of wet scrubber were obtained through testing, which provided a basis for air volume control and determination of frequency control range of wet scrubber.

Research of comprehensive quantitative evaluation of power quality of coal mine

WANG Qingliang, YAO Miao

2015, 41(2): 42-46. doi: 10.13272/j.issn.1671-251x.2015.02.012

<Abstract>(32) <PDF>(2)

Abstract:
The current harmonic distortion reflecting the maximum load current was defined, and a distortion power factor considering non-sinusoidal current waveform was built according to special requirements of coal mine electrical load. The power quality was represented by several indexes of voltage, current and power factor showing each aspects of electric energy. The minimum mean square error method was used to screen electricity sub-index, so as to establish comprehensive evaluation index system of power quality which was suitable for power supply system of coal mine. By calculating weights of each index using entropy weight method, the comprehensive quantitative evaluation model of power quality was proposed based on probability statistics and fuzzy mathematics. Therefore, sub-index calculation and comprehensive evaluation were achieved. The analyzing results of measured data verify rationality of the constructed comprehensive quantitative evaluation index system of power quality and practicability of the evaluation method.

Discussion on design standard of low-voltage IT grounding system in underground mine

GUAN Hengzhu

2015, 41(2): 47-49. doi: 10.13272/j.issn.1671-251x.2015.02.013

<Abstract>(18) <PDF>(4)

Abstract:
The paper introduced principle of grounding fault of low-voltage IT grounding system in underground mine for the first time, and pointed out it is meaningless of a requirement in GB 50070-2009 Design Code for Electric Power in Mine that fault current should not be greater than 5 A when fault with negligible impendance occurred between phase conductor and exposed conductive part of power distribution system for the first time. It also calculated electric shock voltage and current when single-phase grounding fault occurred in IT system and TN system respectively, and got conclusion that the current of direct electric shock in IT system is the same as the one in TN system, and IT system is better than TN system under condition of indirect electric shock.

Coal-rock interface identification based on image multi-wavelet transformatio

HAO Qingyu, ZHU Yuanzhong, CHEN Jian

2015, 41(2): 50-53. doi: 10.13272/j.issn.1671-251x.2015.02.014

<Abstract>(22) <PDF>(4)

Abstract:
In view of problems of poor universality and low reliability in existing identification method of coal-rock interface, an identification method of coal-rock interface based on image multi-wavelet transformation was proposed. Firstly, coal-rock image is transformed by multi-wavelet. Then standard deviation under fixed window size with multi-wavelet coefficients of different frequency bands is extracted as texture measure and normalization multi-band feature vector is formed. Finally, texture feature is identified by naive Bayes classifier. The experimental results show that identification rate can achieve 96.14% when window size is 9 and feature vector constructed by frequency bands 5-16 for image of resolution 128×128.

Coal-rock interface identification scheme based on Hough transform

PENG Jing, LI Xinying, JIA Junxia

2015, 41(2): 54-56. doi: 10.13272/j.issn.1671-251x.2015.02.015

<Abstract>(8) <PDF>(2)

Abstract:
A coal-rock interface identification scheme based on Hough transform was proposed according to characteristic of coal-rock image, namely boundary between coal seam and rock seam is significant and linear. Coal-rock image is pre-processed firstly by denoising and enhancing. Then isolated points on coal-rock edge are removed as well as false edges. Finally, Hough transform is used to identify coal-rock interface. Experimental result shows that the scheme can detect coal-rock boundary fast and correctly.

Chain tension control of scraper conveyor based on sliding mode control

GONG Shangfu, YANG Na

2015, 41(2): 57-60. doi: 10.13272/j.issn.1671-251x.2015.02.016

<Abstract>(20) <PDF>(2)

Abstract:
According to nonlinear, stochastic and time-varying characteristics of chain tension control of scraper conveyor in coal mine underground, a chain tension control system of scraper conveyor was proposed which was based on sliding mode control method to improve dynamic performances of tension control system. The method adopts exponential reaching law to make the tension control system run along prescriptive state trajectory in a certain characteristic. The simulation results show that tension control system based on the method has good dynamic characteristics, strong robustness and superior interference immunity.

Improved extension identification method and its application to water bursting source discriminatio

FENG Lin, LI Fenglian, ZHANG Xueying, WANG Zizhong

2015, 41(2): 61-65. doi: 10.13272/j.issn.1671-251x.2015.02.017

<Abstract>(35) <PDF>(2)

Abstract:
For high misjudgment rates of existing extension identification method which was applied in coal mine water bursting source discrimination, an improved extensicon identification method was put forward. The ranges of classical domain, joint domain and the value of evaluated matter-element of the existing method were normalized, and then the selection of optimal value was optimized. Finally, a new location value calculation method was proposed. Experiment results indicate that application of the improved method to coal mine water bursting source discrimination improves the level of matter-element belongs accurately to a certain aquifer, thus improves accuracy rate of water source discrimination.

Research of influence of pressure and temperature on gas diffusion law

SU Heng, YANG Yong, CHEN Lianfang, ZHAO Jun

2015, 41(2): 65-67. doi: 10.13272/j.issn.1671-251x.2015.02.018

<Abstract>(18) <PDF>(2)

Abstract:
For problems that gas adsorption-desorption method for determining gas diffusion coefficient is limited to coal particle and cannot apply confining pressure and set pressure arbitrarily, regular lump coal combined with gas chromatography analysis method was used to determine gas diffusion coefficient in lump coal, and gas diffusion law under different gas pressure and temperature was analyzed. The experimental results show that with increase of gas pressure, gas adsorbed by coal matrix increases and the coal matrix expand, thus pore decreases, diffusion resistance increases and diffusion coefficient decreases; with increase of temperature, movement speed of gas molecule increases, diffusion power enhances and diffusion coefficient increases.

Direction recognition technology based on single base station applied to underground accurate personnel positioning

TANG Lijun, WU Wei

2015, 41(2): 68-70. doi: 10.13272/j.issn.1671-251x.2015.02.019

<Abstract>(41) <PDF>(4)

Abstract:
In view of problem of high cost and big construction difficulty of existing accurate personnel positioning system which needs two base stations to complete direction recognition function, a kind of direction recognition technology based on single base station was introduced to the system. The single base station adopts two directional antennas to receive the same signal, and judges the direction of miners according to the difference of received signal strength from the two antennas. Applying the technology to direction recognition of underground staff can effectively reduce the cost and construction difficulty of the accurate personnel positioning system, and further help popularize the accurate personnel positioning system in more coal mines.

Underground positioning method of single base station DOA and TOA based on single reflectio

HUANG Kai, ZHAI Yanrong, ZHANG Pengcheng, ZHU Mengying

2015, 41(2): 71-75. doi: 10.13272/j.issn.1671-251x.2015.02.020

<Abstract>(24) <PDF>(3)

Abstract:
In view of problem of big error in underground single base station positioning system due to wireless signal influenced by multipath effect and non-line of sight, a joint estimation positioning method of DOA and TOA based on single reflection was proposed. The method constructs two hyperbolic trajectories which takes base station point and single reflection point as focus by use of TOA estimation of line-of-sight path and multiple single reflection paths, constructs linear line by use of DOA estimation, so as to get binary multiple estimation equation set which contains continuous location information, and obtains precise location of mobile target through calculating intersection of linear line and hyperbola. The simulation results show that the method achieves higher positioning accuracy than line-of-sight direct positioning method with three single reflection paths.

A time synchronization algorithm for wireless sensor network of linear structure

BEI Lulu, ZHANG Ran , HAN Lina, LI Feifei

2015, 41(2): 75-78. doi: 10.13272/j.issn.1671-251x.2015.02.021

<Abstract>(17) <PDF>(2)

Abstract:
In view of network topology of fuzzy control and monitoring system of underground hydraulic support, the paper proposed a time synchronization algorithm adapted to wireless sensor network of linear structure which includes adjacent cluster synchronization and internal cluster synchronization. The adjacent cluster synchronization adopts bisynchronous mechanism which corrects time offset to decrease synchronization errors. The internal cluster synchronization obtains frequency and phase offset between any node and head node in the cluster by constructing logic clock function through least square linear fitting method to improve synchronization precision. The simulation results show that the algorithm can effectively reduce synchronization errors and energy consumption.

Intelligent service system for mine-used equipment testing laboratory

CHEN Qiaoying

2015, 41(2): 79-82. doi: 10.13272/j.issn.1671-251x.2015.02.022

<Abstract>(16) <PDF>(2)

Abstract:
According to characteristics of management and service objects of mine-used equipment testing laboratory, an intelligent service system was proposed which combines with features of laboratory informatization. Based on establishment object and functions of the intelligent service system, the system architecture taking data platform as core was constructed by use of Internet of things, data warehouse, data mining, knowledge database, etc. The trial running shows that the system achieves integration of testing resources and customer service and improves informatization management of mine-used equipment testing laboratory.

Design of control system of coagulant dosing based on PLC

CUI Dongfeng, ZHOU Rulu

2015, 41(2): 83-85. doi: 10.13272/j.issn.1671-251x.2015.02.023

<Abstract>(30) <PDF>(9)

Abstract:
The paper introduced principle, control strategy, hardware constitution and software design of a control system of coagulant dosing based on PLC in details. The control system takes light transmittance pulsation measurement value as control factor, adopts cascade control method of double PID controllers to realize the optimum control of coagulant dosing amount. Meanwhile the system introduces flow ratio feedforward control, so as to ensure the stability of water turbidity.

Design of remote comprehensive monitoring and management system of mineral resources exploitatio

CHEN Yuehui

2015, 41(2): 86-90. doi: 10.13272/j.issn.1671-251x.2015.02.024

<Abstract>(37) <PDF>(3)

Abstract:
For the purpose of monitoring and management of mineral resources exploitation, a remote comprehensive monitoring and management system of mineral resources exploitation was designed, working principle and characteristics of the system were introduced , design of each subsystem of the system was expounded. The system combines technologies of geographic information system and Internet of Things and takes geographic information system as management platform, realizes functions of mine boundary management, monitoring of underground mining, mine video monitoring and control, mine reserves dynamic management. The system improves level of scientific and information management for mineral resources, and achieves purpose of supervising mine by technology.

Research of frequency conversion motor for scraper conveyor

LI Shixu, YAO Liquan, JU Peng

2015, 41(2): 90-93. doi: 10.13272/j.issn.1671-251x.2015.02.025

<Abstract>(23) <PDF>(4)

Abstract:
In order to improve overall performance of scraper conveyor used on working face, frequency conversion motor was used as driving device of scraper conveyor to realize soft start. Designs of mechanical structure, electrical structure and control system of frequency conversion motor were introduced. The points for attention of applying frequency conversion motor were proposed according to application experience.

Research of vibration signal extraction and fault diagnosis of shearer cutting unit

HUA Wei, JI Xiaodong, DONG Shuochang, WU Miao

2015, 41(2): 94-97. doi: 10.13272/j.issn.1671-251x.2015.02.026

<Abstract>(34) <PDF>(4)

Abstract:
In view of problem that it is difficult to extract vibration signal and carry out fault diagnosis of coal mine electromechanical equipment, intrinsically safe mine-used portable vibration recorder was applied to collect vibration signal of shearer cutting unit, and spectrum analysis and Hilbert demodulation technique were used to demodulate fault characteristic frequency of the vibration signal, so as to determine fault location, which provides reliable basis for fault diagnosis and maintenance of shearer.

Design of automatic control system for anti-disaster submersible pump of coal mine

SUN Bingke

2015, 41(2): 97-99. doi: 10.13272/j.issn.1671-251x.2015.02.027

<Abstract>(20) <PDF>(6)

Abstract:
In view of problem that water dam cannot be sealed and cannot be closed while water burst occurs existed in underground drainage system, the paper proposed design scheme of automatic control system for anti-disaster submersible pump of coal mine. The system uses PLC as controller, and achieves automatic control of anti-disaster submersible pump through high-voltage power distribution cabinets, soft start cabinets, electrically operated valve distribution cabinets and various sensors. Practical application results show the effectiveness of the system.

Design of collision warning system of truck for open pit mine

ZHAO Lichang

2015, 41(2): 100-102. doi: 10.13272/j.issn.1671-251x.2015.02.028

<Abstract>(27) <PDF>(3)

Abstract:
In view of problems of large volume of transport truck, poor viewing angle of driver and easily leading to dangerous accident, the paper designed collision warning system of truck for open pit mine based on TOF technology. The system uses WSN modules with ranging capabilities, and determines locations of large vehicles, support vehicles and personnel through wireless ranging method and triangulation location method, and realizes orientation display and alarm. The test results show that ranging distance of the system is no less than 200 m, the error is no greater than 4 m, which can meet requirements of collision warning systems, meanwhile reduces system cost and power consumption.

Design of voice broadcasting system of coal mine based on Ethernet and CAN bus

WEI Wenhui, WEI Mian

2015, 41(2): 103-106. doi: 10.13272/j.issn.1671-251x.2015.02.029

<Abstract>(26) <PDF>(3)

Abstract:
For limitations of broadcasting systems of traditional constant-pressure broadcasting, local amplified phone and personal handphone system, the paper proposed a design scheme of voice broadcasting system of coal mine based on Ethernet and CAN bus and introduced structure, design of hardware and software, key technologies of the system. The system can realize remote voice transmission at lower speed and streaming media online broadcasting, which adopts audio codec method of PCM and Ogg Vorbis and Ethernet and CAN bus to transmit data.

Design of high-speed modem in drilling rescue

QIU Xingguo, FANG Yisong, LIU Zheng

2015, 41(2): 107-110. doi: 10.13272/j.issn.1671-251x.2015.02.030

<Abstract>(9) <PDF>(2)

Abstract:
In view of problem of low communication rate of armored cable which is used as communication line in drilling rescue, the paper designed a high-speed modem. The modem takes DSP chip TMS320F2812 as core, combines with programmable logic device FPGA to realize signal sampling and capture, and carrier modulation and demodulation are conducted on baseband signal by use of amplitude shift keying mode. The test result shows that the high-speed modem can improve transmission rate of signal and anti-interference ability effectively in 1 000 m rescue communication line, and data transmission rate is higher than 1 Mbit/s.

2015 Vol. 41, No. 2

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