2016 Vol. 42, No. 9

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Cover Catalogue
Prospect of perception mine internet of things and its development trend
YAO Jianquan, DING Enjie, ZHANG Shen, WANG Gang
2016, 42(9): 1-5. doi: 10.13272/j.issn.1671-251x.2016.09.001
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Abstract:
Prospect of mine internet of things was given, which was realizing connection among objects in mine, decreasing even eliminating monitoring blind area, and adopting could computing and big data technologies to get useful monitoring information, so as to realize intrinsically safe mine. Development trend of mine internet of things was sorted out from aspects of technologies and service mode. Corresponding concepts were expounded including fog computing technology, network fractal structure, ontology of mine things and intellectualization, cloud computing and big data technologies and so on as well as their application and development in mine internet of things, and cooperative working mode and buying services mode were expected.
Design of shaft boring machine control system
YANG Bingwen, FU Wenjun, LIU Zhiqiang
2016, 42(9): 5-8. doi: 10.13272/j.issn.1671-251x.2016.09.002
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Abstract:
In order to ensure stable and reliable operation of shaft boring machine, an shaft boring machine control system based on PLC was designed, and composition, working principle and software and hardware design schemes were introduced. The system uses two PLC units to control corresponding oil pump, cutting bar rotating motor and pushing and supporting cylinder according to working mode, and uploads state parameters to local operation platform or remote controlling computer for display. The practical application shows that the system runs well.
Design of air flow switch sensor of air duct based on attitude recognition technology
ZHANG Yuanzheng
2016, 42(9): 9-12. doi: 10.13272/j.issn.1671-251x.2016.09.003
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Abstract:
In view of problems of complex production and commissioning, inconvenient installation and maintenance, poor anti-electromagnetic interference existed in air flow sensor of coal mine air duct based on iron frame, an air flow switch sensor of air duct based on attitude recognition technology was designed. The sensor adopts principle of 3-axis acceleration sensor chip attitude detection to achieve state detection of air flow switch of air duct. The practical application shows that the sensor has advantages such as stable and reliable in detection, simple and convenience in installation and maintenance, strong in anti-electromagnetic interference.
Detection system for coal mine electrical inspection instrument with digital display based on machine visio
YE Jingdong, ZONG Shousong, ZHU Meiqiang, LI Ming
2016, 42(9): 13-16. doi: 10.13272/j.issn.1671-251x.2016.09.004
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Abstract:
In view of problems of low measurement efficiency, high labour intensity and being influenced by subjective factors in manually calibrating coal mine electrical inspection instrument with digital display, an automatic inspection system for coal mine electrical inspection instrument with digital display was designed based on machine vision. The system controls power on of the instrument and a video to get booting process, and uses high lights statistics mode to identify key display frame of the electrical inspection instrument, uses template matching to complete automatic identification of the display image, and uses digit recognition with threading method to detect the measurement accuracy automaticly. Validity of the designed system is verified with experiment results from industrial prototype system.
Coal and gas outburst early-warning technology based on change of gas concentratio
XU Xuezhan, MENG Xiangrui, ZOU Yunlong
2016, 42(9): 17-21. doi: 10.13272/j.issn.1671-251x.2016.09.005
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Abstract:
In order to realize real-time, accurate and advanced prediction of coal and gas outburst in heading face, a coal and gas outburst earlywarning method based on change of gas concentration was proposed. Through inversion technique of coal gas pressure in heading face, critical condition of coal and gas outburst was determined, and early-warning model of coal and gas outburst was built. A non-contact early-warning system of coal and gas outburst was developed based on change of gas concentration. The application result shows that the system can monitor change of gas concentration and volume information real-timely, and make non-contact and real-time hazard early-warning in coal and gas outburst regional in advance of a work shift.
Study on comprehensive risk assessment method for provincial coal mine accident
ZHENG Wanbo, WU Yanqing, LI Xianming, XIAO Yumei
2016, 42(9): 22-26. doi: 10.13272/j.issn.1671-251x.2016.09.006
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Abstract:
In view of problem that risk assessment for provincial coal mine lacks theory and method, a comprehensive risk assessment method for provincial coal mine accident was proposed: first of all, quantized value of damage extent and occurrence probability of risk indicators of coal mine accidents were assessed and scored by experts to construct comprehensive judgment matrix; then AHP was used to determine weight of each risk module; and finally, overall risk level of risk modules were calculated. The proposed method lays theoretical and practical basis for risk management of provincial coal mine accidents by generality research of risk assessment of regional coal mine accidents.
Research status of monitoring and control technology of rapid coal loading system
WANG Yangyang, BAO Jiusheng, YIN Yan, TANG Linli, ZHANG Tao
2016, 42(9): 27-32. doi: 10.13272/j.issn.1671-251x.2016.09.007
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Abstract:
Based on a simple introduction of rapid coal loading system, the paper emphatically discussed research status of monitoring technologies of its subsystems including coal storage silo, coal conveying system, weighing system, hydraulic system, vehicle location and identification system. It summarized application status of intelligent control technologies including fuzzy control, neural network control and expert control technology in the rapid coal loading system. Finally, it pointed out some important development tendencies of the monitoring and control technologies for the rapid coal loading system.
Study on outburst prevention effect of short range protective seam mining of Wangxingzhuang Coal Mine
TIAN Kunyun, SUN Guangzhong
2016, 42(9): 33-37. doi: 10.13272/j.issn.1671-251x.2016.09.008
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Abstract:
The paper took Wangxingzhuang Coal Mine of Henan New Energy Development Co., Ltd. as research background, introduced protective seam mining theory, and investigated gas parameters in the same test site before and after taking protective layer mining measures, including gas content, gas pressure, coal seam permeability coefficient and outburst predictive index. Field test results show that after taking protective layer mining measures, gas pressure and content of the protected layer region reduce significantly, the gas emission amount and outburst predictive index decrease obviously, and seam permeability coefficient increases greatly.
Path planning of rescuing robot based on improved artificial potential field method
TIAN Zijian, GAO Xuehao
2016, 42(9): 37-42. doi: 10.13272/j.issn.1671-251x.2016.09.009
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Abstract:
For a problem that rescuing robot was easily stacked into local minimal point by using traditional artificial potential field method to plan path in coal mine underground with complex obstacles, a path planning method of rescuing robot based on improved artificial potential field method was proposed. In the method, perturbation field is added into gravitation field to change gravitation field function, so as to make rescuing robot go out of local minimum point autonomously when the robot stacks into the local minimum point. Meanwhile, obstacle is filled virtually through an obstacle filling method, thus a new obstacle is formed and a corresponding repulsive potential field function is generated to avoid rescuing robot to stack into local minimal point again. The simulation and test results verify feasibility and validity of the method.
Study on industrial test of fully mechanized fast excavation technology of alternating with advancing or bolting
WANG Chensheng, SU Fang
2016, 42(9): 43-47. doi: 10.13272/j.issn.1671-251x.2016.09.010
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Abstract:
In view of problems of fast excavation and slow supporting in traditional roadway excavation technology, anchor drill rig was introduced in Tashan Coal Mine, fully mechanized fast excavation technology of alternating with advancing or bolting was developed, and industrial test of the technology was studied. Through monitoring related parameters in technique implementation process, the following conclusions was obtained : convergence rate of around surrounding rock is less than 0.1 mm/d after roadway excavation support 60 d, explains that roadway convergence is stabile, the maximum rock bolt stress is 206 kN, anchor cable force is 305 kN, all are in the range of security. The conclusion shows that the technology can greatly improve anchoring force and control abscission layer. The technology achieves 10% attrition, improve 41% support efficiency and 33.3% drivage efficiency, which can be popularized and applied.
Fault diagnosis of shearer rocker bearing based on improved EEMD and HMM
WANG Xinggang
2016, 42(9): 48-51. doi: 10.13272/j.issn.167-251x.2016.09.011
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Abstract:
The paper proposed a fault diagnosis method of shearer rocker bearing based on improved EEMD and HMM. The method uses improved extreme points symmetric extension and cosine window function to reduce impact of end effect on decomposition results, so as to improve signal decomposition precision; then extractes energy entropy of each intrinsic mode function as input feature vector of HMM for fault pattern recognition. The experimental results show that bearing fault identification rate of the proposed method is above 90%, which indicates the method achieves accurate fault diagnosis of shearer rocker bearing.
A novel bidirectional DC-DC converter
FANG Xupeng, ZHUANG Jianwei, LI Hui
2016, 42(9): 52-56. doi: 10.13272/j.issn.1671-251x.2016.09.012
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Abstract:
For shortages of traditional Buck-Boost converters such as limited output voltage, poor stability, low voltage gain and so on, a novel bidirectional DC-DC converter was designed which used Z-source network to connect DC input power and load. Working process of the novel converter was analyzed during power forward transmission and power reversed transmission. The experimental results show that the novel converter not only realizes bidirectional power transmission, but also realizes voltage lifting and falling under power forward transmission mode or the reversed one. In addition, the novel converter has more stable output voltage and higher voltage gain than traditional Buck-Boost converter.
Experimental research of influence of coal particle size on initial speed of methane diffusio
YANG Mengmeng, YUAN Mei, XU Lin, XU Shiqing, LI Chuang, WANG Yuli
2016, 42(9): 56-59. doi: 10.13272/j.issn.1671-251x.2016.09.013
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Abstract:
In order to analyze influence of coal particle size on initial speed of methane diffusion, the relationship of particle size and initial speed of methane diffusion of coal samples with different moisture content was tested by use of WT-1 type initial speed of methane diffusion tester. The coal samples were collected in No.4 coal seam in a coal mine with different particle sizes of less than 7 mesh, 7-10 mesh, 10-18 mesh, 18-35 mesh and different moisture content of natural drying, drying, 3%, 5% and 7%. And the initial speed of methane diffusion of coal samples of natural drying and drying for 5 h were tested, which were with different particle sizes of less than 7 mesh & 35-60 mesh,7-10 mesh & 35~60 mesh, and 10-18 mesh & 35-60 mesh under different proportion of 6∶1,5∶2,4∶3,3∶4,2∶5 and 1∶6. The experimental results show that initial speed of methane diffusion of coal samples with different moisture content increases as the particle size decreases, and the particle size smaller, the increasing trend is more obvious; the proportion of coal particles with small particle size in coal seam larger, the initial speed of methane diffusion of coal samples is larger.
Research on power quality comprehensive treatment for coal mine
GUO Songmei
2016, 42(9): 60-64. doi: 10.13272/j.issn.1671-251x.2016.09.014
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Abstract:
For problems of harmonics pollution and voltage fluctuation existed in power quality of coal mine, a power quality comprehensive treatment method based on SVG for coal mine was proposed. The method uses orthogonal transformations theory to realize direct control of active and reactive current, can improve precision of dynamic reactive power compensation, and can suppress influence of grid frequency fluctuation. The simulation results show that the proposed comprehensive treatment method can suppress harmonics caused by nonlinear loads, which improves the comprehensive power quality of coal mine power grid.
Study of character recognition of digital display instrument in coal mine substatio
HAO Jianhua
2016, 42(9): 64-67. doi: 10.13272/j.issn.1671-251x.2016.09.015
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Abstract:
In view of problems of low automation degree and recognition reliability of digital display instrument in coal mine substation, a kind of character recognition algorithm based on improved genetic algorithm and support vector machine algorithm was proposed. The algorithm adopts Harr-Like features as character recognition features, improved genetic algorithm was chosen to search the optimal parameters of the support vector machine classifier, and uses principal component analysis method to conduct the dimension reducing process, then applies support vector machine to identify character of the digital display instrument. The effectiveness and feasibility of the algorithm was validated by experiments.
Design of automatic control system of boom roadheader
WANG Hong
2016, 42(9): 68-71. doi: 10.13272/j.issn.1671-251x.2016.09.016
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Abstract:
In view of problem of low accuracy, automation control performance and work efficiency of body positioning of existing boom roadheader, an automatic control system of boom roadheader was designed, hardware and software design of the system were introduced in detail. The system uses attitude detection technology and automation cutting technology to achieve precise cutting and automatic control of the boom roadheader.
Intelligent monitoring and control system for blind ventilation with long distance in shield construction of coal mine inclined shaft
ZHANG Dawei, XIN Deli
2016, 42(9): 71-73. doi: 10.13272/j.issn.1671-251x.2016.09.017
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Abstract:
An intelligent monitoring and control system was desiged which takes PLC as core for blind ventilation with long distance in shield construction of coal mine inclined shaft. The intelligent monitoring system can automatically adjust ventilator according to change regulation of air flow and pressure of different length of ventilating duct. At the same time, it can monitor environment parameters such as CH4, CO, CO2, O2 and so on in inclined shaft, and send the collected data to mine digital management platform. It ensures safety of ventilation for shield construction.
Application research of lifting wavelet transform in fault diagnosis of coal mine bearing
WU Jian, HUANG Xia
2016, 42(9): 74-76. doi: 10.13272/j.issn.1671-251x.2016.09.018
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Abstract:
In view of fault diagnosis problem of antifriction bearing in mine critical equipment, the paper proposed to apply lifting wavelet transform to fault diagnosis of coal mine bearing, introduced principle of lifting wavelet transform, and designed adaptive lifting wavelet predictor and upgraded filter. The simulation results show that average error of actual measurement value and theoretical value of bearing fault signal is less than 3%, which indicates that the use of lifting wavelet transform enables accurate identification of bearing fault signal under noisy conditions.
Mine hoist knowledge management system based on Web
WEN Sheng, DING Hua, LI Juanli, YANG Zhaojian
2016, 42(9): 77-79. doi: 10.13272/j.issn.1671-251x.2016.09.019
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Abstract:
In order to achieve management and sharing of mine hoist design knowledge, overall structure and organization of knowledge management system were analyzed, and mine hoist knowledge management system based on Web was designed using network technology and database technology. The system contains modules of instance library, components library, materials library and archive library, it provides service platform for quick access to online information for hoist designer, greatly reduces hoist design cycle and improves design efficiency.
Sound signal feature extraction of mine roof percussion based on human auditory model
ZHANG Tieshan, REN Zhong
2016, 42(9): 80-82. doi: 10.13272/j.issn.1671-251x.2016.09.020
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Abstract:
Human auditory model was introduced, vibration model of the basement membrane, inner hair cells model and cochlear nucleus mathematical model were analyzed, and extraction process of auditory spectrum feature vector was given. On the above basis, sound signal feature extraction method of mine roof percussion based on human auditory model was proposed. Human auditory model and wavelet packet were used respectively for sound signal feature extraction of mine roof percussion, and then support vector machine classifier was used for target feature classification and recognition. The experimental results show that correct identification rate of the feature extracted using human auditory model is above 95%, which indicates the sound signal feature extraction method of mine roof percussion based on human auditory model will help improve the accuracy of coal mine roof detection.

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