2016 Vol. 42, No. 5

Display Method:
Explanations for part of monitoring and communication of Coal Mine Safety Regulations of 2016 Editio
SUN Jiping
2016, 42(5): 1-8. doi: 10.13272/j.issn.1671-251x.2016.05.001
Abstract:
The 11th chapter monitoring and communication of Coal Mine Safety Regulations of 2016 Edition is composed of 4 sections, including 23 subsections. Compared with that of the previous editions of Coal Mine Safety Regulations of 2011 Edition, it adds several contents, for instance, personnel position monitoring, mobile communication, image surveillance, real-time data uploading of safety monitoring and control system, coal and gas outburst alarm, wind direction sensors, and full-range or high-low concentration methane sensors are involved in the latest edition of Coal Mine Safety Regulations. According to this edition, optical fiber cables are allowed to be employed in safety monitoring and control system, the adjustment period of catalytic combustible methane sensors is modified to be 15 d, the wind power locking experiment which may cause power failures of local ventilator should be conducted once half a year. In line with the latest edition of Coal Mine Safety Regulations, additionally, methane sensors should be set up in many places or on many facilities, such as air return corners of working faces, intake airways of coal and gas outburst working faces, the middle of return airways of working faces of high gassy coal mines, coal roadways or semi coal-rock roadways of coal and gas outburst mines, split ventilation openings of tunneling faces with gas emissions in rock roadways, mixed return airways of double-roadway tunneling faces of high gassy mines, the middle of excavation roadways of high gassy mines and coal and gas outburst ones, return airways of mining areas, one-wing return airways, main return airways, underground coal storage bins, the ground corridor sides of enclosed belt conveyors, some places above the driving drums of belt conveyors, continuous shearer, bolt drilling rigs, shuttle cars, mine-used explosion-proof diesel locomotives, trackless rubber-tyred vehicles.
Rubber-tyred vehicle transport monitoring system based on physical detection mode
SHE Jiuhua, CHEN Xiaolin, ZHANG Mingjie
2016, 42(5): 9-11. doi: 10.13272/j.issn.1671-251x.2016.05.002
Abstract:
For problems of huge construction cost and maintenance and inability of meeting requirements of some mining areas existed in rubber-tyred vehicle transport monitoring system based on radio frequency identification technology, a rubber-tyred vehicle transport monitoring system based on physical detection mode was proposed. Overall framework of the system, rubber-tyred vehicle identification method and the system control logic were introduced. The application shows the system can identify location of rubber-tyred vehicle and has more convenient setting and maintenance than the one based on radio frequency identification technology.
Design of automatic temperature control system for roadheader
MAO Jiwei
2016, 42(5): 11-13. doi: 10.13272/j.issn.1671-251x.2016.05.003
Abstract:
For limited application problem of traditional roadheader cooling methods by external cooling water, a design scheme of automatic temperature control system for roadheader was proposed. The system uses air cooler as a mandatory cooling unit and PLC as a control unit, and can make temperatures of roadheader cutting motor and hydraulic system within allowable range through temperature signal acquisition and processing and PID control. Underground industrial test result shows that the system helps roadheader run long and stably without external cooling water.
Analysis of automatic cutting section boundary control error for longitudinal roadheader
WANG Suyu, TIAN Jie, WU Miao
2016, 42(5): 14-18. doi: 10.13272/j.issn.1671-251x.2016.05.004
Abstract:
In order to realize automatic cutting with high precision and autonomous cruising of tunneling equipments, a analysis method of automatic cutting section boundary control error for longitudinal roadheader was proposed. The error sources of automatic cutting control system for roadheader had been made clear, which were mainly from steady-state error of control system, sensor precision, inertia of cutting arm, system control method and other non-theoretical calculation factors. The system was simulated and the results showed that influence of load disturbance on system steady-state characteristics was low and the system was stable. Each error was calculated and the maximum error of automatic cutting section boundary control was 71.30 mm in horizontal and 55.27 mm in vertical, which showed that the system fully met the highest standard of Standard for Quality Inspection and Assessment of Shaft Sinking and Drifting of Coal Mine. Through ground tests of automatic cutting control for roadheader, the maximum error of section boundary control was 45 mm in horizontal and 12 mm in vertical in actual measurement.
Underground personnel positioning system based on fingerprint and dead-reckoning
MA Jing, HU Qingsong, SONG Boming, ZHANG Shen
2016, 42(5): 19-23. doi: 10.13272/j.issn.1671-251x.2016.05.005
Abstract:
In view of problem that RSSI-based fingerprint positioning method is greatly influenced by environment of coal mine tunnel, and localization method based on dead-reckoning is easy to form accumulation of errors, underground personnel positioning system based on fingerprint and dead-reckoning was designed. The system periodically collects location and attitude information, uses KNN and peak detection method to solve result of fingerprint and dead-reckoning, and the target position was obtained by weighted fusion of the two positioning results. The test results demonstrate that the system can obviously improve positioning accuracy and stability, and has strong adaptability to the complex environment of coal mine tunnel.
A non-destructive measurement method of metal anchor pole length
ZHANG Faquan, ZHOU Qiang, WANG Guofu, YE Jincai
2016, 42(5): 24-27. doi: 10.13272/j.issn.1671-251x.2016.05.006
Abstract:
For problems of complex signal coupling and limited measuring length existed in non-destructive measurement methods at present, a non-destructive measurement method of metal anchor pole length was proposed based on half wave dipole antenna theory. A half wave dipole antenna is equaled by a metal reference wire as an arm and a single metal anchor pole as the other one. Influence of asymmetric half wave dipole antenna on the antenna resonant frequency is analyzed by HFSS software analyzes, and frequency scanning method is used to find the antenna resonant frequency. The metal anchor pole length is calculated by use of the antenna resonant frequency and the metal reference wire length according to relationship between antenna length and signal wavelength when the half wave dipole antenna resonances. The test results show that measurement length of the method is more than 10 m and measurement error is less than 5%.
Fault diagnosis of underground water pump based on fuzzy Petri net and condition monitoring
GAO Zhengzhong, GONG Qunying, ZHAO Lina, XU Huanqi, XIAO Jiayi
2016, 42(5): 28-31. doi: 10.13272/j.issn.1671-251x.2016.05.007
Abstract:
In order to rapidly find out causes of failure of underground water pump, a fault diagnosis model of underground water pump based on fuzzy Petri net and condition monitoring was established. Firstly, vibration signal of the water pump was measured by the condition monitoring system of underground drainage equipment, training was carried out on the water pump fault samples after vibration analysis. Then, on the structure of fuzzy Petri net model of water pump fault diagnosis, BP algorithm of neural network was introduced to train parameters such as weight values, threshold values and credibility. The results of instances analysis show that the model can be used to find out the causes of pump failure accurately, and has good accuracy, rapidity and adaptability.
Fault prediction method of distributed sensor networks system
LU Ping, ZHENG Wei
2016, 42(5): 32-35. doi: 10.13272/j.issn.1671-251x.2016.05.008
Abstract:
It is difficult to use a general method to implement fault prediction of distributed sensor networks, a kind of fault prediction method based on knowledge discovery was put forward. Firstly, the method establishes mathematical description system of time information, in order to realize the knowledge discovery based on causal index; then, the method uses knowledge reasoning mechanism of causality relationship to realize fault prediction of distributed sensor networks system. A fault prediction experiment of gas drainage monitoring system was carried out, the experiment results prove that the method can accurately predict fault of distributed sensor networks system, and has advantages of simple algorithm, utility and high-efficiency.
Study of response regularity of acoustic emission in gas jet orifice
LI Guo’ai, LI Zhonghui, LOU Quan, LI Xuelong, ZHANG Weiqiang
2016, 42(5): 36-40. doi: 10.13272/j.issn.1671-251x.2016.05.009
Abstract:
In order to prevent danger of coal and gas outburst in process of rock cross-cut coal uncovering, tests and analysis on acoustic emission in rock cross-cut coal uncovering process in a coal mine were conducted based on acoustic emission monitoring system. The analysis and research results indicates that acoustic emission intensity increases rapidly in 2-3 hours before jet orifice occurred, peak strength can reach 2-3 times higher than that no outburst danger, then dropped to lower level before jet orifice occurred. The more serious the jet orifice was, the higher the intensity of acoustic emission was. The variation range of the acoustic emission intensity could reflect severity of the jet orifice, the more obvious the jet orifice was, the more severe the changes of gas concentration was, the greater the growth rate of coal and rock acoustic emission intensity was and the higher the peak intensity was. The analysis and research results have important reference significance for monitoring and forecasting of coal outburst risk in rock cross-cut coal uncovering.
Location and classification of power quality disturbance based on wavelet packet and PN
GONG Maofa, HOU Linyuan, LIANG Longjin, SI Danmiao, LIU Yanni, WANG Ning
2016, 42(5): 40-44. doi: 10.13272/j.issn.1671-251x.2016.05.010
Abstract:
A new method of location and classification of power quality disturbance based on wavelet packet and PNN was proposed according to essential characteristics of transient power quality disturbance. The disturbance signals were sampled and decomposed by using wavelet packet to extract wavelet packet reconstructed coefficient and to locate signal saltation point, then the energy of each band was calculated and normalized, energy feature vectors were constructed as input sample of PNN for network training and testing, and finally classification of different disturbance signal was achieved. Matlab simulation results show that the method can quickly and accurately locate and classify disturbance signal.
Fuzzy control algorithm for high-inclination belt conveyor driven by multi-motor
WANG Qiaolian, GAO Caixia, WANG Fuzhong
2016, 42(5): 45-51. doi: 10.13272/j.issn.1671-251x.2016.05.011
Abstract:
In order to solve the problem of material’s falling or rolling which occurs in starting and braking of high-inclination belt conveyor driven by multi-motor, a fuzzy control algorithm for high-inclination belt conveyor driven by multi-motor was established, and overall control model of high-indiration belt conveyor, speed setting algorithm of belt conveyor, and a fuzzy PID parameters self-tuning algorithm for power balance were introduced. The application shows that the fuzzy control algorithm can automatically adjust speed of belt conveyor according to real-time changes of coal traffic, it makes speed control error lower than 2% and power control error lower than 2.5%, enables power of four drive motors tends to the same, and achieves reliable, safe and energy-saving operation of belt conveyor driven by four motors.
Active thermal balance method of mine electric traction system
YANG Xiao, LI Yanjiang, GUO Dan
2016, 42(5): 51-55. doi: 10.13272/j.issn.1671-251x.2016.05.012
Abstract:
An active thermal balance method of mine electric traction system was proposed to solve the system heating, which completed on-line self-adjustment of motor stator current amplitude and switching frequency of driving system by returning temperature signal of the electric traction system in real time. An optimized d,q axis current vector calculation method based on the temperature signal was proposed, which could make the electric traction system work at working characteristic curve with the maximum overall efficiency. The method has been verified by using 15 kW permanent magnet synchronous motor speed-adjusting system. The experimental result shows the method can ensure dynamic and stable performance of the mine electric traction system and decrease hotspot safety.
Power transfer model of electromagnetic energy harvesting used in mine tunnels
LIU Xiaoming, MAN Zhongcheng, ZHAO Duan
2016, 42(5): 56-63. doi: 10.13272/j.issn.1671-251x.2016.05.013
Abstract:
In order to apply electromagnetic energy harvesting technology in mine tunnels, the power transfer characteristics of electromagnetic energy harvesting were studied using experimental measurement and statistical analysis method. The expression of microwave path loss in tunnel was established, thus the power transfer model of energy harvesting used in mine tunnels was deduced, which is able to calculate power transfer efficiency in both arched and rectangular tunnels in short distance. Simulation and experimental analysis shows correctness of the model, and shows that the power attenuation is affected by the path loss exponent, and improving transmitted power continually is not the optimal choice to promote the charging efficiency, in practical application, different locations should adopt reasonable antenna polarizations to gain the maximal power.
Study of asymmetrical magnetic coupled resonant wireless power transmission system
FAN Yingjie, ZHANG Kairu, ZHANG Linlin, WANG Yi, DI Dongzhao
2016, 42(5): 63-66. doi: 10.13272/j.issn.1671-251x.2016.05.014
Abstract:
According to equivalent model of asymmetrical magnetic coupled resonant wireless power transmission system, a view was pointed out that magnetic coupled resonant wireless power transmission which could maintain long distance transmission at resonance frequency was a special case of magnetic coupled inductive wireless power transmission. Methods of restraining frequency splitting were given, namely changing offset angle and radial distance of axial direction of transmitting coil and receiving coil to reduce mutual inductance coefficient and improve peak voltage of the receiving coil. Finally, experimental platform of asymmetrical magnetic coupled resonant wireless power transmission system was built and the experimental results verified correctness of theoretical analysis.
Analysis of frequency characteristics of magnetic coupled resonant wireless power transmission system
LAN Yongjun, GONG Lijiao, CAI Xinhong, LI Hongwei
2016, 42(5): 67-70. doi: 10.13272/j.issn.1671-251x.2016.05.015
Abstract:
Factors that affect transmission power and efficiency of magnetic coupled wireless power transmission system based on self-resonance coils and magnetic coupled wireless power transmission system based on series capacitor tuning were obtained according to equivalent circuit models, and frequency characteristics of the two systems were analyzed. The experimental results show that there is no frequency splitting in the magnetic coupled wireless power transmission system based on self-resonance coils with larger transmission power, while there is frequency splitting in the magnetic coupled wireless power transmission system based on series capacitor tuning when distance between receiving coil and sending coil is less than a critical value, because resonant frequency is influenced by coil equivalent shunt capacitance and external series capacitance.
Research of wireless power supply system for automatic long-distance inspection winch
XIA Chenyang, WANG Wei, REN Siyuan, ZHANG Yang, LAI Na, GU Zhipeng, LIU Haiwei, LYU Longbiao, LIU Feng
2016, 42(5): 71-75. doi: 10.13272/j.issn.1671-251x.2016.05.016
Abstract:
For power supply problem of coal mine winch, a wireless power supply system for automatic long-distance inspection winch was designed. The wireless power supply mode of the system was introduced in details. Conclusions gotten by theoretical analysis were as following: the system output power and output efficiency decline with increasing of primary coil resistance and increase with increasing of inverter switching frequency. According to the conclusions and long-distance guide for coal mine winch, a sectional power supply mode was designed. The simulation and experiment results verify feasibility of the system.
Optimal control method of grinding process basic circuit
ZHANG Yan, ZHANG Jia, DAI Yafei
2016, 42(5): 76-80. doi: 10.13272/j.issn.1671-251x.2016.05.017
Abstract:
The paper took control of an important technological parameter namely hydrocyclone feeding concertration of grinding process basic circuit as study object, introduced fuzzy control according to bad parameter adaptivity of model-free adaptive control (MFAC), and proposed a fuzzy MFAC method. It gave theoretical derivation process of the method and designed a fuzzy MFAC controller. Compared with basic MFAC method and PID method, the simulation experimental results show that the fuzzy MFAC method can quickly track expected value with smaller overshoot and tracking error and has strong anti-interference performance.
Mining team management system based on GIS
WU Jiayi, HAN Litao, SHI Meng, LEI Yanhui
2016, 42(5): 81-84. doi: 10.13272/j.issn.1671-251x.2016.05.018
Abstract:
In view of particularity of coal mining and key problems of trajectory tracking, dynamic monitoring, distribution of heat map analysis, emergency rescue, interest points label in mining process of team management, a mining team management system based on GIS was designed. The system takes GIS, mobile Internet communication technology, RFID and wireless monitoring technology as main technical means, and realizes functions such as intelligent management in underground and on ground, data analysis visualization of team management, real-time dynamic for members distribution and instant communication between members combining with attribute data and geographic space information.
Linkage control mode of integrated automation system based on WCF
LI Yong
2016, 42(5): 85-88. doi: 10.13272/j.issn.1671-251x.2016.05.019
Abstract:
Combining with practical application of integrated automation system in coal mine enterprises, types and characteristics of linkage control modes were concluded and classified, then linkage control mode of integrated automation system based on WCF was proposed, and linkage control interface specifications were achieved. The linkage control mode put WCF service into the acquisition module to provide linkage control services for platform terminal. The acquisition module achieves transmission and conversion of interactive information between platform terminal and controlled subsystem; meanwhile, it follows original platform structure and fully utilizes the special functions of the acquisition module.
Lead-carbon battery energy storage system for coal mine ventilator
NIU Jianna, ZHOU You, WU Tong
2016, 42(5): 88-91. doi: 10.13272/j.issn.1671-251x.2016.05.020
Abstract:
In order to improve reliability of power supply and ensure safety production of coal mine, a lead-carbon battery energy storage system used as emergency power supply for coal mine ventilator was introduced, and system structure, grid access way, system functions, start and quit strategy were described. The system can provide one hour power supply to coal mine ventilator when there is a local grid failure, and guarantee regular operation and safety production for coal mine.