2016 Vol. 42, No. 2

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Revision amendments of AQ 6201 General Technical Requirements of Coal Mine Safety Monitoring System
SUN Jiping
2016, 42(2): 1-7. doi: 10.13272/j.issn.1671-251x.2016.02.001
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Abstract:
In order to further play role of coal mine safety monitoring system in gas control, AQ 6201-2006 General Technical Requirements of Coal Mine Safety Monitoring System should be amended. The main contents of proposed amendments include: increasing alarm and power-off locking function of coal and gas outburst, increasing wind direction sensor; allowing the use of optical fiber cable transmission in the system; enhancing sensor protection grade to IP65; dual host computer hot-backup and automatic switch are needed and lightning protection of underground power source is not needed; reducing transmission processing error; error rate of analog input, analog output and cumulative input transmission processing is not more than 0.5%; shortening the maximum inspection cycle of the system, which is not more than 10 s; prolonging record storage time and shortening information missing time; real-time monitoring value of methane and other important monitoring points should be kept for more than 3 months, analog value statistics and records should be kept for more than 2 years; when a system failure occurs, time length of losing above information should be not more than 40 s; shortening response time of extracting picture, response time of extracting 85% of the whole picture is less than 1 s, and response time of extracting the other pictures is less than 2 s; reducing bit error rate, which should not be greater than 10-9; increasing transmission distance from substation to sensor and power supply distance from intrinsically safe power source to substation, the transmission distance from substation to sensor and actuator and the power supply distance should be more than 2 km, or 3 km, or 6 km; shortening switch time of two computers, the time from the host fault to the backup host into normal working should be not more than 40 s; increasing working time of backup power source, when grid is blackout, the backup power source should be able to ensure that the system continuous monitoring time is not less than 3 h; reducing immunity test level, the immunity levels of electrostatic discharge, RF electromagnetic field radiation, electrical transient bursts and surge are the second level; canceling requirements of reliability; monitoring equipments used in underground coal mine must be explosion-proof.
Evaluation of rock burst tendency of coal seam based on Hamming distance method
ZHANG Weiqiang, WANG Enyuan, LI Xuelong, KONG Xiangguo, LI Guoai
2016, 42(2): 7-11. doi: 10.13272/j.issn.1671-251x.2016.02.002
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Abstract:
In allusion to shortcomings of current evaluation methods about rock burst tendency of coal seam, a model was built for comprehensively evaluating rock burst tendency of coal seam on basis of Hamming distance theory. Dynamic failure time, impact energy index, elastic energy index and uniaxial compressive strength are selected as comprehensive evaluation indexes in the model. Membership functions of evaluation objects are structured by use of linear interpolation formula. Then similar degree between the evaluation objects and standard objects is gotten respectively by Hamming distance method. Evaluation results are gotten through using the minimum Hamming distance to evaluate classification. The analysis result of actual example shows that the evaluation results of Hamming distance method are consistent with rock burst tendency of coal seam in actually field; by contrasting Hamming distances of coal samples which are at the same burst tendency level, it is found that Hamming distance method has a higher resolution ratio than fuzzy comprehensive evaluation method and entropy-ideal point method.
Online upgrade scheme of software of hydraulic supports control system based on IAP
YU Yayun, SONG Jiancheng, TIAN Muqin, XU Chunyu, GENG Zexin, SONG Xin, LI Xinsheng
2016, 42(2): 12-15. doi: 10.13272/j.issn.1671-251x.2016.02.003
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Abstract:
It is very complex and inconvenient to update application software of hydraulic support control system in underground working face. In order to solve the problem, a scheme of online upgrade based on IAP was designed, and an online download mode of program source codes based on three-stage communication structure was proposed. The code is extracted by explosion-proof computer and sent to the server, then all the support controllers are upgraded by the server. For adapting to underground complex electromagnetic environment, the XRAM store link and data validation link are combined to improve reliability of online upgrade, which can avoid the problem of upgrade failure caused by communication error. A set of HEX file code processing software was developed based on PowerBuilder to achieve automatic code extraction of software.
A new type of underground automatic loading and unloading device
LI Aimin, CHEN Fei, PENG Xi
2016, 42(2): 16-18. doi: 10.13272/j.issn.1671-251x.2016.02.004
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Abstract:
For low efficiency caused by manually putting dry concrete material into pug mill during underground guniting support, a new type of automatic loading and unloading device was proposed by analyzing structures of existing automatic loading and unloading devices, and structure design of the device was introduced in details. The device uses caterpilar belt running gear to move following pug mill, adopts closed clam bucket to reduce dust, and loads and unloads concrete material automatically, so as to improve supporting efficiency.
Design of mine-used frequency-switchable half-mode substrate-integrated cavity antenna
LIU Fengxue, XU Zhao, HUA Gang
2016, 42(2): 19-22. doi: 10.13272/j.issn.1671-251x.2016.02.005
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Abstract:
Based on half-mode substrate-integrated cavity antenna, a mine-used frequency-switchable half-mode substrate-integrated cavity antenna was designed considering requirements for underground wireless communication and personnel real-time monitoring. Effect on resonance frequency by adding shorting pin in different positions inside cavity was analyzed. Based on the analysis, capacity of frequency-switching in band of 2.45-3.07 GHz was realized by installing removable screw through several pre-designed holes on the antenna. A prototype of the proposed antenna was fabricated with conductive fabric, conductive threads and leather substrate. The design of the proposed antenna was finally validated by agreement between the simulation and test results.
Coal and gas outburst features in Guizhou mining areas and its prevention countermeasures
KONG Que, WU Guiyi, ZHONG Feng, CHEN Jiming
2016, 42(2): 22-26. doi: 10.13272/j.issn.1671-251x.2016.02.006
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Abstract:
With collection and analysis of outburst indexs in 381 mines and 695 seams and 214 coal and gas outburst accidents occurred in 120 mines in Guizhou mining areas, a study on coal and gas outburst index distribution features and outburst features in Guizhou mining areas was conducted, and relative outburst prevention countermeasures were proposed. Enhanced coal seam outburst index measurement, developing strict management system to mining areas with high outburst strength and more outburst such as Qianbei, Zhina, Liuzhi, Panjiang and Shuicheng, enhanced outburst prevention work of coal roadway heading face, and enhanced blasting management, dynamic phenomenon monitoring and geological structure detecting could be applied to reduce coal and gas outburst accidents occurred in Guizhou mining areas.
Application of data mining technology in coal mine hidden hazard management
CHEN Yunqi
2016, 42(2): 27-30. doi: 10.13272/j.issn.1671-251x.2016.02.007
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For lack of deep analysis of hidden hazard data in current coal mine hidden hazard management, data mining algorithms which were suitable for discovering association rule of hidden hazard were introduced, and support-confidence-Kulczynski model was proposed to indicate association relationship among hidden hazard factors. Data warehouse is built after preprocessing and conversion of hidden hazard data, and mining analysis is conducted on four dimensions such as department, category, level and address of hidden hazard, so as to provide corresponding assistant decision-making according to strong association rule founded among dimensions. The actual application results show that occurrence of hidden hazard is reduced and reliable support is provided for coal mine hidden hazard management by use of the data mining algorithm.
Study on key technologies of unmanned driving shearer
ZHANG Hao, GE Shirong
2016, 42(2): 31-33. doi: 10.13272/j.issn.1671-251x.2016.02.008
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The paper described technical architecture of unmanned driving shearer from aspects of recognition system, decision-making system and control system. It discussed key technologies of unmanned driving shearer and their breakthrough directions, including autonomous positioning technology of shearer, autonomous correction technology of shearer, coal-rock interface recognition technology and autonomous obstacle avoidance technology of shearer, considered multi-sensor fusion technology could improve accuracy and reliability of autonomous positioning and navigation of shearer, and provide technical idea to solve key problems of unmanned driving shearer.
Methane sensor based on micro-ring resonator
WANG Wenqing, WANG Xiaolu, TIAN Zijian
2016, 42(2): 34-38. doi: 10.13272/j.issn.1671-251x.2016.02.009
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A new type of methane sensor was proposed which was based on micro-ring resonator. The sensor is coated cryptophane A on micro-ring surface to increase effective refractive index of the micro-ring, so as to make resonance wave length in the micro-ring resonator drift towards the right along with methane concentration increasing. Methane concentration is gotten by measuring the outputted resonance wave length. The theoretical analysis results show that change of the outputted resonance wave length of the sensor is within a free spectral range, and methane concentration measuring range is 0~15%. By comparing measurement results of SOI material and polymer material, single sensitive film and three sensitive films, a conclusion is gotten that polymeric material micro-ring with three sensitive films has larger variation width of resonance wave length, which has measurement sensitivity of 60 pm.
Adjustment of mine air volume based on air volume dispatchable model
CUI Chuanbo, JIANG Shuguang, WANG Kai, SHAO Hao, WU Zhenyan
2016, 42(2): 39-43. doi: 10.13272/j.issn.1671-251x.2016.02.010
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Due to the air volume of branch of ventilation network is influenced by each other, and the method of change branch wind resistance to airflow distribution will be caused the air volume of decreased faster branch airflow cannot meet the minimum requirements, the air volume dispatchable model was set up based on airflow condition theory, an adjustment method of air volume based on air volume dispatchable model was proposed. The adjustment method uses ventilation network solution to calculate adjustable range of branch wind resistance, and obtains the air volume of branch from quantitative angle. Using the method to calculate air volume is convenient to choose the most adjustable branch and confirm the wind resistance adjustment range and variation of air quantity.
Fault diagnosis method of mineral transmission equipment based on sparse classification algorithm
XIA Huili, GUO Yanan, YU Fajun
2016, 42(2): 43-46. doi: 10.13272/j.issn.1671-251x.2016.02.011
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Abstract:
In view of the problem that the existing fault diagnosis methods based on feature frequency identification for mineral transmission equipments are susceptible to strong noise, a new fault diagnosis method based on sparse classification algorithm for mineral transmission equipment was proposed. Firstly, vibration signals for the known fault types of equipment are collected by computer and transformed by Fourier transformation. Then, the Fourier transformation coefficient vectors of test vibration signal are sparsely coded on a dictionary, which is constructed by merging the Fourier transformation coefficient vectors of the known vibration signals, so as to get sparse coefficient. At last, the fault types of the test samples are labeled by identifying their minimal reconstruction errors. The simulation and test results demonstrate that the method can effectively diagnose the fault type of bearing of mineral transmission equipment, which provides a novel method for fault monitoring of transmission equipment in coal mine.
A new leakage protection method for mine power network
ZHAO Jianwen, LI Ke, SUI Xiaona, LI He, HE Tao, ZHANG Senlin, ZHU Jing
2016, 42(2): 47-51. doi: 10.13272/j.issn.1671-251x.2016.02.012
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A new leakage protection method was proposed which was based on least-square matrix algorithm. In the method, zero sequence current signal of each brance is extracted on the basis of additional DC source system, and DC component of the zero sequence current signal is extracted by the least-square matrix algorithm. According to the DC component, insulation resistance value of each branch is calculated. If the insulation resistance value of a branch is bigger than action resistance value, the branch is judged as fault branch. The simulation result shows the method is accurate，reliable and with high adaptability.
Segment data fitting method for support pressure monitoring
ZHANG Yuwu, XU Huadong, WANG Yingying
2016, 42(2): 51-54. doi: 10.13272/j.issn.1671-251x.2016.02.013
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Abstract:
When support pressure monitoring system is used in over-length workface, it is very difficult to meet both demands of real-time transmission and capturing burst signals in the pressure because of limitation of bus querying period. A segment data fitting method was proposed for support pressure monitoring. In the method, data is divided as a segment according to querying period of the system. If data amount in a data segment is less than amount of fitting coefficients, the data is transmitted directly. If the data amount is larger, data polynomial fitting method is used to fit the data, thus fitting coefficients are gotten and transmitted. The experimental result shows that the method reduces amount of data transmission significantly, reserves important information and fixes data transmission amount in each querying period for clear data transmission management.
Design of a mine-used directional antenna
WANG Tingting, XU Zhao
2016, 42(2): 55-57. doi: 10.13272/j.issn.1671-251x.2016.02.014
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A two-arms planar spiral antenna was designed for long-narrow confined space like tunnels. The antenna is composed of two symmetrical arms which are structured by four equiangular helix lines. Compared with traditional omni-directional antenna, the antenna has greater potential for reducing reflection loss of radio waves by tunnel walls. Because of circular polarization characteristics, the antenna has potential for weakening influence of multi-path effect, and bidirectional radiation characteristic can make the antenna to improve radiation efficiency. The simulation results show that when the antenna with five cores works at 2.4 GHz, half power beam width in 3 dB is more than 60 degree and gain is more than 4 dB while the antenna with ten cores is 120 degree and 6 dB seperately.
Measurement of detection distance of laser pointer based on CCD detection technology
WANG Nan, WU Liangsheng, YANG Yang, LU Xingjian
2016, 42(2): 58-61. doi: 10.13272/j.issn.1671-251x.2016.02.015
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In view of the problem of poor stability, low efficiency existed in distance detection method of low power semiconductor laser pointer, a measurement method of detection distance of laser pointer based on CCD detection technology was put forward. The detection distance equation of laser pointer with human eye as the receiver was deduced and modeling by using the CCD sensor and image processing technology. The function mathematical model between the two parameters of optical power and gray scale was also established. The least square method was used to solve correlation coefficient of the equation，the detection distance can be solved by correlation coefficient. The method realizes quantitative detection of detection distance of low power semiconductor laser pointer. The feasibility of the method is verified by experiment.
Research of bifurcation phenomenon of DC-DC bidirectional power converter with constant power loads
ZHANG Yong, XU Ruidong, LI Tao, XU Shanyu, WANG Long
2016, 42(2): 61-66. doi: 10.13272/j.issn.1671-251x.2016.02.016
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The DC micro-grids architecture based on multistage power converter was studied, the research method of constant power load was proposed and the simplified model of DC micro-grids was built. According to the simplified model, the discrete mapping with DC-DC bidirectional converter operating in intermittent mode was built, and the iterative equation and computational formula of feedback factor in stable condition were given. The bifurcation waveform between output voltage and feedback factor was obtained according to iterative equation. Simulation and experiment results show that by increasing the feedback factor, the circuit will work from stable condition to bidirectional point and run into chaos eventually.
Design of temperature monitoring circuit of mine-used explosion-proof trackless rubber-tyred vehicle
CHENG Liusheng
2016, 42(2): 67-71. doi: 10.13272/j.issn.1671-251x.2016.02.017
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In view of the problem of measurement narrow range and great error of temperature monitoring method for existing mine-used explosion-proof trackless rubber-tyred vehicle, a temperature monitoring circuit of mine-used explosion-proof trackless rubber-tyred vehicle was designed. The thin film platinum resistor was chosen as the sensing element of the circuit, nonlinear bridge sampling circuit and operational amplifier circuit were used to collect weak resistance signals, nonlinear and linear calculation method were used to calculate the resistance value, so as to calculate the temperature of tested unit by resistance value. The actual application shows that the circuit is stable and reliable in running, which provides a stable foundation support of reliable control for mine-used explosion-proof electrical rubber-tyred vehicle.
Design and application of mine-used intrinsically-safe network access device
XU Jie
2016, 42(2): 71-73. doi: 10.13272/j.issn.1671-251x.2016.02.018
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In view of problems of low flexibility and mobility existed in industrial Ethernet in underground difficult cable laying or welding occasions, as well as mobile data transmission, a mine-used intrinsically-safe network access device based on 2.4G-WiFi was designed. Wired Ethernet data was transmited by 2.4G-wireless transmission. The practical application results validate the access device is stable and reliable.
Design of coal mine pressure monitoring system with low power consumptio
HE Qun, HAO Runfang
2016, 42(2): 73-76. doi: 10.13272/j.issn.1671-251x.2016.02.019
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In view of problem of complex structure, large power consumption of sensor and data instability existed in wired communication mode of pressure monitoring system of underground coal mine, coal mine pressure monitoring system with low power consumption based on ZigBee was designed. The system uses pressure sensor with low power consumption to collect data, and the data was summarized to sub-station through ZigBee wireless transmission, then sub-station uploaded the data to PC software after data packaging and processing, so as to achieve real-time monitoring of underground tunnel pressure data. It reduces power consumption of sensor, and thereby increases system life.
Design of wireless temperature measurement system for coal storage
WANG Xianwei, CHEN Shihai, MA Xiaoping, ZHANG Qingxue, WANG Shuai, QU Shenyue
2016, 42(2): 77-80. doi: 10.13272/j.issn.1671-251x.2016.02.020
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Wireless temperature measurement system for coal storage was designed combining modern wireless network technology and traditional temperature measurement technology. The system uses temperature sensor to measure temperature at various points of the coal storage sites, completes data transmission between sub-station and sensor modules via wireless transmitter/receiver module, and uses GPRS module to upload data from sub-station to control room, so achieves temperature data acquisition and wireless transmission.

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