2016 Vol. 42, No. 6

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Cover Catalogue
Electromagnetic positioning system of pipeline blockage clearing robot
WEI Mingsheng, TONG Minming, ZHANG Chunya, XIA Jing
2016, 42(6): 1-4. doi: 10.13272/j.issn.1671-251x.2016.06.001
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Abstract:
Positioning principle of pipeline blockage clearing robot was introduced, the distribution regularities of extremely low frequency electromagnetic signals outside the pipe were analyzed according to magnetic dipole model, one-dimensional positioning method of pipeline blockage clearing robot was established, and electromagnetic positioning system of pipeline blockage clearing robot was designed. Experimental results show that the system can achieve effective positioning of robot, when receiving antennas moves at speed of 5 m/s and 10 m/s, mobile positioning error ranges are -20.7-19.8 cm and -24.3-27.1 cm, which can fully meet project accuracy requirements.
Design of a new type of acquisition instrument for mine pressure monitoring
LI Panpan, LI Yunbo, XIAO Yong, ZHANG Xiaoyu
2016, 42(6): 5-8. doi: 10.13272/j.issn.1671-251x.2016.06.002
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Abstract:
According to working characteristics of steel string type pressure monitoring sensor, a new type of acquisition instrument for mine pressure monitoring was designed. The instrument uses self-adaption feedback frequency sweep vibration technology, and takes STM32 single-chip microcomputer as main control chip which outputs frequency sweep vibration signals to excite internal steel string of steel string type pressure monitoring sensor to reach resonance state, so as to get corresponding measured pressure through calculating according to the resonance frequency. The experiment results show that tiny signal frequency error of the instrument collected is no more than 0.5%, and the instrument can meet with actual needs of mine production.
Design of mine-used wearable folded half-mode substrate-integrated cavity antenna
CUI Jie, LIU Fengxue, ZANG Qiliang, XU Zhao
2016, 42(6): 8-12. doi: 10.13272/j.issn.1671-251x.2016.06.003
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Abstract:
Based on half-mode substrate-integrated cavity antenna, a mine-used wearable folded half-mode substrate-integrated cavity antenna was designed considering requirements for underground wearable antenna. Width of antenna is reduced by use of folded geometry, and planar antenna is realized with horizontal feeding probe structure. The simulation results show that the antenna resonates at 5 GHz, -10 dB bandwidth is 254 MHz, the maximum gain is 5.4 dBi, radiation efficiency is 70%, and the antenna has radiation direction with wide beamwidth and low back radiation. Besides, -10 dB bandwidth of the antenna can be increased with thicker upper substrate.
LiFeO4 battery power supply system for mine auxiliary transportation vehicle
XIAO Nan, CHEN Zhongxia, CHANG Long, YU Zhihao, GUO Hai
2016, 42(6): 12-16. doi: 10.13272/j.issn.1671-251x.2016.06.004
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Abstract:
For problems of short cycle life and high maintenance cost of existing power supply of domestic mine auxiliary transportation vehicle which uses lead-acid batteries as power supply, the paper proposed application of LiFeO4 battery to the mine vehicle. Firstly, characteristics of the lithium battery group was studied through analyzing influence of cell capacity and resistance characteristics on li-ion battery inconsistency, and then li-ion battery power supply system that can be used for the mine transportation vehicle was developed according to related security standard of coal mine, mainly including li-ion battery pack, battery management system and explosion-proof box. The test results of prototype show that the power supply system can be applied to a variety of auxiliary transportation vehicles, and can meet use requirements.
Shearer rocker swing angle detection device based on gravity acceleratio
ZHAO Ming
2016, 42(6): 16-19. doi: 10.13272/j.issn.1671-251x.2016.06.005
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Abstract:
In view of problem that shearer rocker swing angle detection device based on angular displacement detection principle requires high installation precision and has complex calibration, a shearer rocker swing angle detection device based on gravity acceleration was designed. The device uses inclinometer SCA830 to get absolute incline angle of the device, and then calculates out actual swing angle of the shearer rocker according to shearer incline angle and the device's installation location. The experimental results show that the device is easy to mount and calibrate, and has accurate test results, quick response and good real-time performance.
Theory and key technologies for wireless magnetic induction sensor network in challenging environment
SHI Wenjuan, SUN Yanjing, LI Song, ZHAI Wenyan, TAN Zefu, CAI Li
2016, 42(6): 20-25. doi: 10.13272/j.issn.1671-251x.2016.06.006
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Abstract:
In view of requirements of security and environmental monitoring in coal mine multiplex medium in challenging environment, in order to conquer the obstacles such as serious path loss, dynamic channel condition and constrained supply condition and so on, theory model of wireless magnetic induction communication and magnetic induction waveguide communication in multiplex medium was proposed, and structure of wireless magnetic induction sensor network was given. Research directions and application of wireless magnetic induction sensor networks in the future were prospected, the urgency of related study was pointed out. It has great significance to safety monitoring of underground environment and the oil, gas or water pipeline which is especially long or in densely populated area.
Hidden dangers in coal mine and their preventive measures
ZHAO Zengyu
2016, 42(6): 25-29. doi: 10.13272/j.issn.1671-251x.2016.06.007
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Abstract:
For usual hidden dangers in coal mine such as wear, edge tear and longitudinal tear of conveyor belt, poor automatic watering protection effect under over temperature of belt conveyor, spontaneous combustion of coal bunker and coal pile, coal bunker breakdown caused by water coal, person falling down during maintaining pit shaft, series combustion caused by poor plugging of power cable hole, locomotive transportation danger, error operation of electrical device, oil burning and so on, causes of above hidden dangers were analyzed, and corresponding preventive measures were given.
Analysis of water directing styles of underground drainage system
SHE Ying, LUO Minghua, ZHANG Haifeng
2016, 42(6): 30-32. doi: 10.13272/j.issn.1671-251x.2016.06.008
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Abstract:
Based on project experience of coal mine, water directing styles of coal mine drainage system were counted, and their basic compositions, working principles and applicable environment were described particularly. Implementation methods of different water directing styles on automatic drainage system were studied and expressed. Advantages and disadvantages of the different styles were compared and summarized to provide technical reference for automatic drainage system.
Transmission power optimization of magnetic resonance coupling wireless power transmission system
TIAN Zijian, CAO Yangyang, FAN Jing, DU Xinxin
2016, 42(6): 33-37. doi: 10.13272/j.issn.1671-251x.2016.06.009
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Abstract:
Principle of magnetic resonance coupling wireless power transmission system was analyzed by use of mutual inductance theory. Impedance matching theory and corresponding parameter calculation methods were introduced. A model of magnetic resonance coupling wireless power transmission system containing an impedance matcher was built by equaling variation of mutual inductance between sending coil and receiving coil to variation of the system impedance parameters. The simulation result proves that magnetic resonance coupling wireless power transmission system containing an impedance matcher can improve load power effectively under the same condition.
Experimental study on characteristics of acoustic emission for coal containing gas damaged evolution under loading
NIU Yue, LI Zhonghui, WANG Honghao, WANG Jiali, LIU Shuaijie, YIN Shan, KONG Yanhui, HONG Sen
2016, 42(6): 37-41. doi: 10.13272/j.issn.1671-251x.2016.06.010
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Abstract:
An information collection system of coal containing gas under uniaxial compression was built, dates' change of acoustic emission and mechanical parameters while coal samples loaded were tested, and damaged evolution model of coal and rock and characteristic of acoustic emission were studied deeply. The research results show that there are acoustic emission signals produced during loaded process for coal containing gas. The number of acoustic emission singles is less at early stage and more at later stage, while achieves the maximum value when the load reaches peak value. The change trend of pulse number and energy of acoustic emission is consistent with the load value, which can reflect damage degree of coal containing gas well. Based on the coal damaged evolution model of acoustic emission characteristics parameters, change trend of damage value calculated from the acoustic emission pulse number and energy and the actual measured value are basical identical. As a precursor information, the acoustic emission signal can represent damage evolution laws of coal and rock and reflect damage state under loaded state. The research result would provide reference for monitoring and preventing of gas dynamic disaster of coal and rock in coal mine.
Research on an automatic drilling method for dual-arm drill rig
ZHANG Fuxiang, SHI Wenju
2016, 42(6): 42-45. doi: 10.13272/j.issn.1671-251x.2016.06.011
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Based on kinematics analysis of dual-arm drill rig, operation ability and ideal position of dual-arm drill rig were analyzed, collision detection methods of dual-arm drill rig between the arms and between the arms and roadway were studied, and an automatic drilling method for dual-arim drill rig was put forward. A simulation experiment was carried out in Matlab. The experimental result shows that the method can make the arms of dirll rig arrive the ideal position and realize automatic drilling, which lays a foundation for further research on trajectory planning of the arms of dual-arm drill rig and automatic drilling.
Research of routing protocol for wireless sensor network in coal mine tunnel based on multi sink nodes
LI Wanghuai, XIA Xu
2016, 42(6): 46-51. doi: 10.13272/j.issn.1671-251x.2016.06.012
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Abstract:
When traditional wireless sensor network based on single sink node is applied in coal mine monitoring system, the sensors far away from tunnel crossing cannot transmit monitoring data to sink nodes in the tunnel crossing real timely and exactly. In order to solve above problem, a routing protocol for wireless sensor network based on multi sink nodes was proposed which was suitable for long strip structure of coal mine tunnel. The protocol introduces wireless sensor network structure based on multi sink nodes and unequal clustering thought, and adopts a power control algorithm based on multi sink nodes and an unequal clustering algorithm to optimize the optimal communication radius, transmit power, cluster head selection and calculation method of unequal radius of each sink node. The simulation results show that the protocol has advantages in connectivity, delay and network lifetime, and can reduce the whole network energy consumption effectively and prolong network survival time.
Approach for remaining useful life prediction for mechanical equipment based on similarity
WU Bin, LI Lu, SONG Jiancheng, QU Bingni, LI Hongwei, YANG Jiankang
2016, 42(6): 52-56. doi: 10.13272/j.issn.1671-251x.2016.06.013
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In view of problem that remaining useful life of complex machinical equipment was difficult to predict, an approach for remaining useful life prediction based on similarity was presented. Feature extraction method was established based on correlation analysis, reference remaining useful life and its weight can be determined by computing similarity of the relevant feature between sample data and prediction data. Finally, remaining useful life can be obtained by calculating weighted sum of the reference remaining useful life. Experiment results show that the proposed approach can effectively extract feature which can precisely reflect variation trend of the remaining useful life of bearing, and can more effectively predict remaining useful life of bearing with accuracy rate of 81.8%, and provides a scientific basis for life management of related equipment.
Design of mine-used power supply with super wide input voltage range
LIU Yahui
2016, 42(6): 57-60. doi: 10.13272/j.issn.1671-251x.2016.06.014
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For problems of existing mine-used flameproof and intrinsically safe type power supply with multiple input voltage level such as large voltage fluctuation, heavy weight and difficult maintenance, a design scheme of mine-used power supply with super wide input voltage range was put forward. The power supply uses a combination of Buck topology and Flyback topology, and can convert super wide input voltage of AC80-900 V to a stable DC voltage. Experimental results show that the power supply has strong anti input fluctuation performance, stable output voltage, low ripple and high efficiency.
Status evaluation of relay protector based on an improved fuzzy-gray method
MA Chunyan, GONG Ying
2016, 42(6): 61-64. doi: 10.13272/j.issn.1671-251x.2016.06.015
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For unclear and inaccurate performance of status evaluation of relay protector, an improved fuzzy-gray method was proposed for the status evaluation problem. Firstly, an index system is constructed from aspects of historical conditions, maintenance conditions and monitoring conditions. Gray point is used to describe inaccuracy of evaluation information. Then nonlinear membership functions are constructed to attain membership, so as to get fuzzy-gray matrix. Finally fuzzy-gray status evaluation for relay protector is carried out, and evaluation result is re-optimized by weighted average operator. The example shows that the method can reflect operating condition of relay protector more accurately.
Research of online monitoring of high voltage cable insulation degradation of coal mine
WANG Yongsheng, LI Xiaona, ZHAO Guodong, PENG Qixuan, LIANG Rui
2016, 42(6): 65-69. doi: 10.13272/j.issn.1671-251x.2016.06.016
<Abstract>(31) <HTML> (9) <PDF>(3)
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Electrical characteristics of coal mine high voltage cable was analyzed under situation of water tree aging, electrical tree aging and overall uniform deterioration. Wavelet noise canceling technology and signal separation technology based on orthogonal decomposition were used for noise signal processing of grounding line current. Changing trends and set threshold of grounding line current were used to determine whether cable insulation deterioration occurs. Matlab simulation results show that researching relationship between insulation parameters changing of each line and different components of corresponding grounding-line current enables extraction of characteristic signal of online monitoring of high voltage cable insulation degradation of coal mine.
Dead-beat circulating current suppression method of underground UPS paralleling power supply system
WANG Ling, WU Tao, LI Zhizhong
2016, 42(6): 70-74. doi: 10.13272/j.issn.1671-251x.2016.06.017
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In order to improve reliability of underground UPS power supply system, a dead-beat circulating current suppression method of underground UPS paralleling power supply system was put forward. Firstly, an equivalent discrete mathematical model of UPS paralleling power supply system topology was established, and zero sequence circulating current in paralleling power supply system was emphatically analyzed. Then, nonlinear dead-beat controller was introduced to control and process zero sequence current. Finally, verification and analysis of the method were done by prototype of 2×35 kW UPS paralleling power supply system. The experimental results show that the method can effectively inhibit zero sequence current of underground UPS paralleling power supply system，and realize redundancy restoration of UPS paralleling power system in 2-5 ms.
Underground monitoring image sharpening device based on embedded system
ZHOU Xue, WU Fangda, YANG Liuming
2016, 42(6): 74-77. doi: 10.13272/j.issn.1671-251x.2016.06.018
<Abstract>(27) <HTML> (10) <PDF>(11)
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In view of problems of low illumination, a lot of dust and complex electromagnetic environment in coal mine underground, and images' quality captured by underground monitoring equipment would be reduced in transferring process caused by underground noises, an underground monitoring image sharpening device based on embedded system was designed. The device uses wavelet threshold algorithm and DSP embedded system, and it can effectively restrain noise, meanwhile keep details characteristics and peak point of original images, which greatly enhances monitoring image clarity.
Design of safety protection system of mine electric locomotive
LI Junhong
2016, 42(6): 77-79. doi: 10.13272/j.issn.1671-251x.2016.06.019
<Abstract>(55) <HTML> (10) <PDF>(6)
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In view of problems that existing coal mine electric locomotive safety control cannot effectively prevent red light running, rear-end collision and collision, a kind of safety protection system of mine electric locomotive was designed. The system adopts radio frequency wireless communication technology and uses signals of signal, integrated and blocked system to control safe operation of the electric locomotive, which realizes functions of red light alarm, vehicle distance presentation and over-speed control. The practical application shows that the system improves security of electric locomotive transportation, and greatly reduces rate of transportation accidents.
Digital remote monitoring system for long inclined shaft constructed by shield method
NIU Yunpeng
2016, 42(6): 80-82. doi: 10.13272/j.issn.1671-251x.2016.06.020
<Abstract>(36) <HTML> (7) <PDF>(4)
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A digital remote monitoring system for long inclined shaft constructed by shield method was introduced from aspects of design principle, function and field application scheme taking long inclined shaft project of Xinjie Taigemiao coal mine as an example. The system can realize remote monitoring of running state and parameter of shield devices, shield construction process, complex field morphology of deep inclined shaft, mechanical form of assembling type pipe structure, etc.

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