2014 Vol. 40, No. 3

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Proposal of revision for monitoring, communication and video surveillance of Coal Mine Safety Regulatio
SUN Jiping
2014, 40(3): 1-6. doi: 10.13272/j.issn.1671-251x.2014.03.001
<Abstract>(79) <PDF>(7)
Abstract:
The paper put forward the revision of Coal Mine Safety Regulation should add content of mine mobile communication, broadcast communication, video surveillance, personnel positioning, coal production monitoring, monitoring of mine fire, mine pressure, hydrological monitoring and remote monitoring and so on. It presented that mine monitoring system sharing channel with video surveillance system is forbidden, the cable of dispatching communication system should be dedicated devices of the system, the trunk network should adopt mine Ethernet optical network with volume of gigabit or gigabit above which has function of redundancy, and mine mobile devices and wireless access should be preferred WiFi, ZigBee, 4G technologies. It put forward the core optical fiber and cable for coal mine safety monitoring system and dispatching communication system should be set up separately from different wellbores or different locations of a shaft into the underground, the optical fiber and cable should be provided with protection measures, and the optical fiber and cable should be buried under roadway floor crossover with laneway's side at the pit without serious floor heave. It put forward coal mine safety monitoring system should be equipped with functions of main ventilator monitoring, gas extraction monitoring, real-time on-line monitoring both for the breathing dust density and total dust concentration, air direction monitoring, and analysis of gas change rate, alarm of coal and gas outburst. It also presented that methane sensor for highly gassy and coal (rock) and gas outburst mines should be full range of high-low concentration which preference is given to laser or infrared methane sensor; methane detection equipment such as carrier catalytic element of methane sensor and portable methane detection alarming device should be calibrated regularly with standard gas and air sample, and the calibration is needed at least once every 15 days; methane overrun power cut function test is needed at least once every 15 days; mining face at the highly gassy and coal (rock) and gas outburst mines should setup methane sensor in upper corner which gas concentration for overrun alarm limit is 1.0% CH4, gas concentration for power cut limit is 1.5% CH4, and gas concentration for power regain limit is 1.0% CH4.
Research of active balancing control system of mine-used Li-ion battery units
ZHANG Desheng, PENG Ran, HAN Yuwe
2014, 40(3): 6-8.
<Abstract>(48) <PDF>(6)
Abstract:
In order to weaken imbalance of each single cell in battery units and improve battery life and efficiency, an active balancing control system of mine-used Li-ion battery units was designed. The system detects voltage of each single cell in battery units real-timely, when the maximum differential voltage of each single cell exceeds threshold value, the balancing circuit starts to trickle charge the battery with the lowest cell voltage. The experiment results show that the system can make the maximum differential voltage of each single cell within 30 mV after battery units is charged, which improves efficiency of battery units.
Study of large capacity power supply used for coal mine emergency facilities
LI Meixiang, ZHOU Zhong, ZHANG Yong
2014, 40(3): 9-11. doi: 10.13272/j.issn.1671-251x.2014.03.002
<Abstract>(69) <PDF>(4)
Abstract:
In view of problem that common accumulators used in underground coal mine have obvious constraints, the paper analyzed electricity demands of coal mine emergency facilities and characteristics of dry-charged lead-acid battery, developed large capacity start-up type power supply for coal mine emergency facilities based on dry-charged lead-acid battery technology. The theory analysis and experiment result of product show that the power supply does't produce hydrogen and can be used in coal mine, has good consistency of group working performance and large capacity, and its electrical performance can satisfy demands of coal mine emergency facilities.
Research of noise in audio system of fully mechanized working face
HE Yonghua
2014, 40(3): 11-15. doi: 10.13272/j.issn.1671-251x.2014.03.003
<Abstract>(47) <PDF>(5)
Abstract:
Major sources of noise in audio system of fully mechanized working face were researched in the practice. Advices of design of filter were given for different application requirements, and band-pass active filter was designed. Requirements of sound field distribution to equipment installation, selection of balanced and unbalanced signals and corresponding interference measures were analyzed.
Design of wireless detection system of driving device of scraper conveyor
ZHAO Zheqian, ZHAO Sihai, HU Yuwei, NIE Zhe
2014, 40(3): 16-19. doi: 10.13272/j.issn.1671-251x.2014.03.004
<Abstract>(69) <PDF>(4)
Abstract:
In view of problems of complex wiring and bad reliability because current driving device of scraper conveyor uses wired detection mode, a wireless detection system of driving device of scraper conveyor based on RFID technology was designed. Parameters collected by various sensors are sent to nRF24LE1 radio frequency module, and the nRF24LE1 radio frequency module sends the data to wireless receiving substation which includes embedded chip S3C4510B through antenna. The wireless receiving substation transmits the data to CAN/Ethernet gateway of roadway through CAN bus. The debugging result shows that the system has high reliability and can detect each parameter of the driving device of scraper conveyor without wire connection.
Design of overpressure protection system for long-distance grouting pipeline
LIU Lei, WANG Weifeng
2014, 40(3): 19-21. doi: 10.13272/j.issn.1671-251x.2014.03.005
<Abstract>(54) <PDF>(5)
Abstract:
In view of problem that existing mine grouting system cannot protect pipeline real-timely when pressure is too large, the paper proposed design scheme of overpressure protection system for long-distance grouting pipeline based on PLC. The system takes Omron PLC as control center, uses pressure transmitter to collect real-time pressure value of current pipeline. If the pressure overruns and continues 50 s, the slurry pump stops working to achieve emergency stop. Monitoring system on PC receives real-time pressure and flow values from PLC control system and displays them, so as to achieve monitoring of pressure and flow of main grouting pipeline. Industrial test results show that the overpressure protection system works well, and can meet the demands of overpressure protection of mine grouting system.
Design of a new type of intrinsic safety pilot circuit of magnetic starter
TONG Jun, YIN Hongyu, ZHANG Chengmin, QIU Wendong
2014, 40(3): 22-24. doi: 10.13272/j.issn.1671-251x.2014.03.006
<Abstract>(61) <PDF>(5)
Abstract:
In view of shortcoming that intrinsic safety pilot circuit controlled by relay exists unstable faults of self-starting and low-voltage starting, a new type of intrinsic safety pilot circuit with optical coupling isolation of mine-used magnetic starter based on microcomputer control was designed, working principle of the circuit was introduced in details. The practical application shows that the pilot circuit has reliable performance and stable operation.
Design of drilling parameter monitor based on CAN bus
SHAN Chengwei
2014, 40(3): 25-27. doi: 10.13272/j.issn.1671-251x.2014.03.007
<Abstract>(83) <PDF>(5)
Abstract:
In order to real-timely monitor process parameter of mine-used full hydraulic drilling machine and to realize rapid fault diagnosis of drilling machine, a drilling parameter monitor based on CAN bus was designed, designs of hardware, software and characteristics of the monitor were introduced in details. The monitor adopts distributed control, uses CAN bus to exchange data, not only can real-timely monitor and display pump pressure, rotating speed, pump volume and temperature of fuel tank , oil level and gas concentration, but also can achieve data transmission through computer, which satisfies requirements of site construction.
Prediction of gas concentration based on residual correction of Markov chai
HAN Tingting, WU Shiyue, WANG Pengjun
2014, 40(3): 28-31. doi: 10.13272/j.issn.1671-251x.2014.03.008
<Abstract>(51) <PDF>(4)
Abstract:
In view of problem of low accuracy of part of prediction values while using gray neural network for gas concentration prediction, the paper proposed a method of using Markov model to correct prediction results of three-order gray neural network model. It described establishment of gray neural network model and Markov residual correction method, and used the method to analyze and predict gas concentration in different locations of a coal mine at different times. Practical application results show that the maximum relative error of predicted gas concentration and measured value reduced from 14% to 6% after Markov residual correction, and the corrected gas concentration curve is closer to the actual changing trend of gas concentration.
Practical exploration on construction of digital mine
WANG Jisheng, PAN Tao
2014, 40(3): 32-35. doi: 10.13272/j.issn.1671-251x.2014.03.009
<Abstract>(46) <PDF>(7)
Abstract:
The paper took the 863 project named Key Technology Research and Demonstration of Digital Mine which is undertaken by Shenhua Group as background, introduced understanding of digital mine construction and demonstration condition in Jinjie Coal Mine. The Jinjie Coal Mine construction practice shows that the intelligence integration platform applies informatization technology to solidify process of coal mine operation and standard operating procedures, and integrates advanced technologies, so as to solve sub-system isolation problem in a long term, achieve scheduling operation synergy and scheduling transformation, enhance management and emergency operation ability, and attain the goals of full perception, intelligent linkage, detailed control, green and low consumption, safe and efficient.
Analysis of capacity problem of underground video monitoring system
YANG Qingxiang, LI Shuo, QIN Wenguang, WANG Haiyan
2014, 40(3): 35-37. doi: 10.13272/j.issn.1671-251x.2014.03.010
<Abstract>(35) <PDF>(9)
Abstract:
In view of problem that underground video monitoring system based on wireless Mesh network uses multi-hop transmission technique which leads to system capacity and signal bandwidth reducing, the paper proposed to use multi-input multi-output technology in wireless Mesh network to improve system capacity, and analyzed capacity of multi-input multi-output system and did simulation verification. Matlab simulation results show that the multi-input multi-output technology can effectively improve system capacity without increasing the bandwidth, and solve the problem of bandwidth reducing during multi-hop transmission of underground video, so as to improve real-time transmission quality of underground video.
Image analysis algorithm of X-ray detection system for conveyor belt with steel rope core
ZHU Ping, HU Peng, SUN Jian
2014, 40(3): 38-41. doi: 10.13272/j.issn.1671-251x.2014.03.011
<Abstract>(76) <PDF>(5)
Abstract:
A kind of image analysis algorithm combining on-line analysis and off-line analysis was proposed: SVM was adopted to detect conjunctions images, and saliency map was used to check image of damaged belt during on-line analysis phase; Image processing methods such as thinning and regional analysis were used to detect joints twitching and classify a variety of injuries during off-line analysis phase. The conveyer belt detection system could analyze X image of conveyor belt in real time and detect damage accurately via applying these algorithms. The experiments and field deployments verify effectiveness of the proposed image analysis algorithm.
Comparison and analysis of private network solution based on TD-SCDMA and rent network solutio
WANG Anyi, LUO Xiaofeng
2014, 40(3): 42-45. doi: 10.13272/j.issn.1671-251x.2014.03.012
<Abstract>(49) <PDF>(2)
Abstract:
For development demands and characteristics of informatization of coal industry, the paper analyzed and compared private network solution and rent network solution mainly from adaptability, disaster tolerance, scheduling functions, security, voice quality and other aspects, and got conclusions that private network solution had significant advantages. It analyzed advantages of TD-SCDMA network solution specifically, and indicated that private network solution can solve current communication problems of coal industry more effectively and meet the needs of coal mine safe production and communication development.
Design of a new type of overshoot elimination system of transient electromagnetic transmitter
HAN Bing, YU Shengbao, SUN Ha
2014, 40(3): 45-48. doi: 10.13272/j.issn.1671-251x.2014.03.013
<Abstract>(53) <PDF>(3)
Abstract:
In view of problem of detection blind area caused by overshoot of transmitting current of transient electromagnetic transmitter, the paper proposed a design scheme of a new type of overshoot elimination system of transient electromagnetic transmitter. An optimal RLC second-order circuit is paralleled at two ends of transmitting coil, the circuit is connected when the transmitting current decreases close to zero, which makes the transmitting current accord to exponential decay, so as to eliminate current overshoot effectively. The simulation and experiment results show that the scheme can eliminate overshoot oscillation of the transmitting current and reduce detection blind area.
Analysis of reflection of signal integrity of transmission line
CHEN Li
2014, 40(3): 49-52. doi: 10.13272/j.issn.1671-251x.2014.03.014
<Abstract>(60) <PDF>(2)
Abstract:
In view of problem of signal integrity of transmission line in high-speed circuit system, the paper gave reasons of reflection phenomenon produced in signal transmission through analysis for equivalent circuit of transmission line on PCB of high-speed circuit. It introduced common methods of eliminating the reflection, namely selecting uniform transmission line, using proper topology of wiring and impedance matching method, and indicated that the impedance matching method can solve the reflection phenomenon in signal transmission, and expounded principles of eliminating the reflection and applicable condition of impedance matching method of source-end and impedance matching method of load-end. In view of reflection problem in clock circuit, the paper used PADS/Hyperlynx software to make simulation for the impedance matching method, the result shows that the impedance matching method can improve the reflection phenomenon in signal transmission.
Optimal design of resonant coil of wireless power transmission system
WANG Guodong, YUAN Lulu
2014, 40(3): 53-56. doi: 10.13272/j.issn.1671-251x.2014.03.015
<Abstract>(21) <PDF>(3)
Abstract:
Taking equivalent circuit model of two coils of magnetically-coupled resonant wireless power transmission system as example, the paper detailedly analyzed influence of parameters of resonant coil such as coil radius, wire radius and coil turns on inductance and quality factor at no-load state of the resonant coil. It got optimal parameters of the resonant coil as follows when power frequency is 13.56 MHz: value of the inductance is 2.634×10-5 H, value of distributed capacitance is 5.229×10-6 μF, the coil radius is 50 mm, the wire radius is 1.05 mm and the coil turns are 10. The optimal results have a certain reference value for research of magnetically-coupled resonant wireless power transmission system.
Efficiency optimization of direct torque control for permanent magnet synchronous motor
SUN Wen, ZHANG Xinghua
2014, 40(3): 56-59. doi: 10.13272/j.issn.1671-251x.2014.03.016
<Abstract>(51) <PDF>(3)
Abstract:
For problem of efficiency and power factor falling of permanent magnet synchronous motor running in light load and high speed, an efficiency optimization strategy of direct torque control for permanent magnet synchronous motor was proposed. The mathematical model was established based on considering iron loss of permanent magnet synchronous motor and analyzing relationships among power loss and torque, speed and stator flux linkage, and the optimal stator flux amplitude was derived. The optimal stator flux calculation module was embedded into direct torque control system, and speed-regulation control system of optimal efficiency of direct torque control for permanent magnet synchronous motor was constituted. The simulation results show that the strategy can effectively reduce the power loss of permanent magnet synchronous motor and improve operation efficiency of the motor.
A new type of fault diagnosis method of asynchronous motor
GOU Xijin, XU Jinxia, KONG Lili
2014, 40(3): 60-63. doi: 10.13272/j.issn.1671-251x.2014.03.017
<Abstract>(57) <PDF>(2)
Abstract:
In view of problem of difficult parameters determination existed in fault diagnosis method of asynchronous motor based on RBF neural network, the paper proposed a fault diagnosis method of asynchronous motor based on RBF neural network optimized by differential evolution algorithm. Firstly, the method uses wavelet transformation to make de-noising process for running state signal of asynchronous motor, then it uses principle component analysis method and wavelet packet analysis method to extract feature of the de-noised signal of asynchronous motor, and at last it uses RBF neural network optimized by differential evolution algorithm to diagnose the feature. The experiment result shows that the RBF neural network optimized by the differential evolution algorithm can identify faults of asynchronous motor effectively compared with RBF neural network without optimization.
Integral inversion fuzzy sliding mode control of brushless DC motor
LIU Huibo, LI Zhaoyang
2014, 40(3): 64-69. doi: 10.13272/j.issn.1671-251x.2014.03.018
<Abstract>(42) <PDF>(4)
Abstract:
In view of problem that general control strategies of brushless DC motor are difficult to achieve desired effect affected by motor itself, the paper introduced a controller combined with integral inversion adaptive sliding mode variable structure control and fuzzy control. The controller adds integral term to sliding surface to realize tracking without static error, and improves steady precision of control system. It uses fuzzy controller to solve the problem that gain setting of switching control can only rely on experience, and estimates uncertainty by fuzzy control algorithm, which effectively reduces chattering brought by sliding mode control method. Reaching law was redesigned to further improve control performance. The simulation results show that the controller can significantly improve performance of control system of brushless DC motor.
Fuzzy control method of power balance of multi-motor driving belt conveyor
YANG Guanghui, AN Qi
2014, 40(3): 69-73. doi: 10.13272/j.issn.1671-251x.2014.03.019
<Abstract>(54) <PDF>(2)
Abstract:
In view of problem of multi-motor driving system of belt conveyor which takes speed variable hydraulic couplers as driving device and uses traditional methods to control power balance between drive motors, namely dynamic characteristics of the system is poor during its running process and adjustment accuracy of power balance is low, the paper proposed a fuzzy control method of power balance of multi-motor driving belt conveyor： implement closed-loop control for turbine speed of hydraulic couplers, so as to ensure constant speed of the conveyor belt when load of working machine changes, and adopt fuzzy controller instead of traditional PID controller to improve the adjustment accuracy of power balance. Matlab simulation results show that the fuzzy control method can effectively improve dynamic performance of the system and adjustment accuracy of power balance.
Design of MMC passive controller based on EL model
LI Yunfeng, SONG Pinggang, JIANG Lang, DUAN Chengting
2014, 40(3): 74-79. doi: 10.13272/j.issn.1671-251x.2014.03.020
<Abstract>(74) <PDF>(3)
Abstract:
An electromagnetic transient mathematical model of MMC based on switch state function was built and an improved MMC passive controller based on EL model was designed. The controller adopts error control method, namely using zero control error to make actual output track given reference value of MMC control system. In order to make error energy decay to zero rapidly and speed up dissipative characteristics, the damping matrix was introduced; To eliminate steady state residual voltage, MMC DC voltage was introduced to control system, and compared with reference direct voltage, the voltage is regulated by PI control and is added to active current reference component to get ultimate active current reference component. The simulation results show that the controller can completely track reference value, reduce voltage fluctuation range, and has good dynamic response.
Image preprocessing method for underground variable lighting conditions
SHANG Changchun, MA Hongwei, CHEN Yanbing
2014, 40(3): 79-82. doi: 10.13272/j.issn.1671-251x.2014.03.021
<Abstract>(56) <PDF>(2)
Abstract:
The paper introduced two histogram-based preprocessing algorithms and Gamma correction algorithm, proved that overall effect of histogram specification was better than histogram equalization by example comparing. It proposed a method only processing illumination component ratio of image, the method enhances contrast of image, and retains more detailed information than the image preprocessing method based on the whole image. The results of histogram specification and Gamma correction process to illumination component of image show that histogram specification gets the best results.
Air-blowing experiment of coal and gangue
ZHAO Haifang, CHEN Ying
2014, 40(3): 83-85. doi: 10.13272/j.issn.1671-251x.2014.03.022
<Abstract>(46) <PDF>(2)
Abstract:
The influence of belt speed, air pressure and selection number on the rate of mixed gangue and rate of separated gangue was researched by orthogonal experiment method and using separation device with air-blowing method, and the experiment results were analyzed by regression and variance analysis. The analysis results show that the rate of mixed gangue increases with belt speed and decreases with the increase of air pressure and number of selection; rate of separated gangue decreases with the increase of belt speed and increases with the increase of air pressure and number of separation. The belt speed, air pressure and number of separation have a great effect on rate of mixed gangue and rate of separated gangue, the order is belt speed, number of separation and air pressure.
Study of calibration system of borehole opening parameters based on ultrasonic principle
TIAN Yanxin, WU Yincheng, ZENG Wei, LIU Jingwei
2014, 40(3): 86-89. doi: 10.13272/j.issn.1671-251x.2014.03.023
<Abstract>(30) <PDF>(2)
Abstract:
In view of problems of tedious operation procedures, needing long time for steady drilling, low accuracy of traditional manual measurement method for calibration of borehole opening azimuth and tilt angles, a calibration system of borehole opening parameters based on ultrasonic principle was designed. The system uses ultrasonic transit time detection method to measure distance between reference points, calculates azimuth angle by single-chip, and selects micro-mechanical triaxial accelerometer to measure tilt angle, which achieves fully automated, real-time tracking and measuring and intelligent voice guidance for rig attitude adjustment. It realizes fast calibration for necessary borehole opening parameters within tolerance limits. The system improves accuracy and efficiency of calibration of borehole opening parameters, as well as mine management level, while reduces labor intensity and mine management cost.
A monitoring and fault diagnosis system for shearer based on embedded platform
FENG Xuejun, LIU Shoubao, YANG Hai, WANG Qu
2014, 40(3): 90-94. doi: 10.13272/j.issn.1671-251x.2014.03.024
<Abstract>(36) <PDF>(2)
Abstract:
A monitoring and fault diagnosis system for shearer based on NI CRIO embedded platform and LabView development platform was constructed, main functions and design of hardware and software of the system were introduced in details. The system not only can real-timely monitor, control state of movement device of the shearer, and make over-threshold alarm, and can real-timely store monitored parameters and fault information, so as to analyze running status of shearer by technician, but also can real-timely display vibration signals of the shearer, and can filter, analyze time-domain, cepstrum and power spectrum, so as to implement fault diagnosis function before delivery and in maintenance process, which is helpful to locate fault for shearer.
Application of detection method of ultrasound and high-frequency current in partial discharge detection of 35 kV switchgear
LUO Dongsong, LU Ye
2014, 40(3): 94-97. doi: 10.13272/j.issn.1671-251x.2014.03.025
<Abstract>(40) <PDF>(2)
Abstract:
The paper introduced basic principle, detection and determinants of partial discharge detection method based on a combination method of ultrasound and high-frequency current. The detection method was applied to partial discharge detection of a high-voltage power distribution room of 35 kV switchgear and the result verified the method can accurately determine partial discharge position, discharge phase, type of discharge and discharge intensity of switchgear, and can analyze its tendency, which provides a strong technical support for online monitoring of switchgear status.
Research of application of SQL Server 2008 in intelligent customer relationship management system of coal enterprises
OUYANG Hao, RONG Luqing, HUANG Zhenjin, CHEN Bo, WANG Meng
2014, 40(3): 98-102. doi: 10.13272/j.issn.1671-251x.2014.03.026
<Abstract>(42) <PDF>(4)
Abstract:
In view of requirements of informatization and intelligence of customer relationship management system of coal enterprises, the paper proposed a design scheme of intelligent customer relationship management system of coal enterprises based on SQL Server 2008. It gave data mining flow of the intelligent customer relationship management system, and detailedly introduced application of intelligent business tool of SQL Server 2008 in the intelligent customer relationship management system of coal enterprises, which includes structure of cluster deployment and software framework of the intelligent customer relationship management system of coal enterprises. The example analysis results validate feasibility of the system.
Design of wireless voice communication and video monitoring system
QIAO Zhanjun, YANG Jingjing, ZHANG Xiao
2014, 40(3): 103-105. doi: 10.13272/j.issn.1671-251x.2014.03.027
<Abstract>(60) <PDF>(3)
Abstract:
In view of situation that current monitoring system only has video monitoring and is lack of voice communication, design scheme of a wireless voice communication and video monitoring system based on ARM was proposed. The system uses adaptive differential pulse code modulation algorithm for voice coding and compression, uses discrete cosine transform algorithm to compress video data, and uses TCP/IP protocol for data transmission over the wireless LAN. The test results show that the system achieves real-time video monitoring and voice communication, and has reliable performance and low cost.
Design and analysis of structure of coal mine rescue robots
CHEN Hailong, GUO Peng
2014, 40(3): 106-109. doi: 10.13272/j.issn.1671-251x.2014.03.028
<Abstract>(61) <PDF>(3)
Abstract:
In view of non-structural characteristic and complexity of mine landscape environment, the paper analyzed mechanical system principle of running system of wheeled rescue robots and put forward design scheme of six-wheeled running system of robots in order to improve obstacle climbing ability and actual rescue capability. The six-wheeled mobile robot uses electric putter to provide power for lift system, uses independent suspension system to reduce tilt and vibration of the body, and adopts centralized control-distributed driven to give play to movement mechanism. It can adjust base structure according to terrain features, and has strong obstacle capability and adaptability for unstructured terrain.
Construction of information retrieval platform for Chongqing shale gas resource
XIE Hongbin, LIU Dong, TAN Dejun, CHENG Lijun, LIU Junfeng, LI Zubing
2014, 40(3): 109-112. doi: 10.13272/j.issn.1671-251x.2014.03.029
<Abstract>(36) <PDF>(3)
Abstract:
In order to speed up shale gas exploration and production of Chongqing, the paper discussed construction of shale gas resource database and information retrieval platform. It determined technical methods of establishment of shale gas resource database and retrieval platform, initially identified contents of shale gas resources database and structure, functional requirements and retrieval model of retrieval platform, which provides ideas for platform construction.

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