工矿自动化

Research advances and prospects of mine Internet of Things

DING Enjie, ZHAO Zhikai

2015, 41(5): 1-5. doi: 10.13272/j.issn.1671-251x.2015.05.001

<Abstract>(79) <PDF>(15)

Abstract:
Concepts and development history of domestic and foreign mine Internet of Things(IoT) were introduced, then research states of mine IoT were summarized from aspects of system architecture, perception layer, transport layer, application layer and engineering application. Main problems existing in current research of mine IoT were pointed out, namely lacking intelligent sensor or device with low energy consumption, environmental energy capturing technology of mine, data and network security method, public service platform and standards about mine IoT. Some possible development directions of mine IoT were probed on from aspects of embedded intelligent information sensing technology, cloud service platform of mine safety production based on big data and security.

Research of straightness control system of fully-mechanized coal mining face

NIU Jianfeng

2015, 41(5): 5-8. doi: 10.13272/j.issn.1671-251x.2015.05.002

<Abstract>(124) <PDF>(11)

Abstract:
The paper analyzed main methods of straightness control of fully-mechanized coal mining face and introduced working principle of straightness control. It used laser alignment sensor to design straightness control system in coal mining face, so as to achieve straightness control of hydraulic support. Underground principle experiment results show that the system can effectively control relative position of supports along the working face direction, and straightness control precision reaches 30 mm, which can meet requirements of straightness control of coal mining face.

Precise positioning method of underground moving target based on distance measurement technology

LI Zhengdong, ZHANG Kefan, BAO Jianju

2015, 41(5): 9-12. doi: 10.13272/j.issn.1671-251x.2015.05.003

<Abstract>(53) <PDF>(5)

Abstract:
In view of problem that the accuracy of existing personnel positioning system is not high and ca't meet demand of precise positioning, a precise positioning method of underground moving target based on distance measurement technology was proposed. The method uses RSSI and TOF ranging technology to calculate accurate position of moving target, and can use historical data to estimate current location of the target in failure ranging caused by communication barriers. The experimental results show that the method can effectively obtain the moving target location, and has low computation complexity and good real-time performance, so it can be used for accurate personnel positioning in mine underground.

Development of KJ699 micro-seismic monitoring system based on multi-substatio

ZHU Shangsong

2015, 41(5): 13-18. doi: 10.13272/j.issn.1671-251x.2015.05.004

<Abstract>(61) <PDF>(5)

Abstract:
For monitoring range limitation of current single-substation micro-seismic monitoring system, a KJ699 micro-seismic monitoring system based on multi-substation was developed. The system uses multi-substation clock synchronization technique, introduces concept of mine-wide and extends monitoring range from one coal face wide to mine-wide. Meanwhile, the system optimizes location method of micro-seismic focus by use of velocity calibration and optimal channel selection technology based on the mine-wide monitoring scale. The field test result shows that the system can monitor a wider range micro-seismic, and enhances location accuracy and automation capability, which can provide better basic information for seismic activity analysis, risk assessment and pre-warning of rock burst.

Detection system of resonance frequency for magnetostrictive material based on AD5933

GAO Shuang, CUI Langfu, CHENG Peng, GUO Xing, DENG Liming, SANG Shengbo

2015, 41(5): 18-22. doi: 10.13272/j.issn.1671-251x.2015.05.005

<Abstract>(39) <PDF>(5)

Abstract:
According to impedance measurement method, a detection system of resonance frequency for magnetostrictive material based on AD5933 was designed. The hardware circuit and software design of the detection system were presented in details. The detection system uses impedance measurement module based on AD5933, microcontroller processing module based on MSP430F169, display module based on LCD 12864 and power supply module to realize data collection, processing, storage of resonance frequency of magnetostrictive material and impedance spectrum display. The test results show that the detection system has characteristics of low measurement error, strong anti-interference and high real-time performance, and average detection error is as low as 7 Hz.

Design of heterogeneous data integration platform of smart mine

YANG Shaohua, ZHOU Xin, BI Junlei

2015, 41(5): 23-26. doi: 10.13272/j.issn.1671-251x.2015.05.006

<Abstract>(70) <PDF>(11)

Abstract:
In view of problem of heterogeneous data source existed in current information system in the process of smart mine construction, a solution was presented that uses XML technology to establish heterogeneous data integration platform, overall framework of the smart mine and architecture of the heterogeneous data integration platform were introduced. Under the condition of without changing physical location and system structure of existing data sources, the platform uses XML technology to losslessly convert heterogeneous data to XML documents, and realizes effective integration of heterogeneous data sources through analysis, decomposition and conversion of application demand of smart mine safety production decision. The platform provides data support for monitoring, management and decision-making of smart mine.

Research of application of wireless charging technology in mine-used portable methane detector

MIAO Kebi

2015, 41(5): 26-28. doi: 10.13272/j.issn.1671-251x.2015.05.007

<Abstract>(72) <PDF>(5)

Abstract:
For problems of contact charging mode of existing mine-used portable methane detector, such as contact would be loose and oxidized, battery life was short under the condition of long charging time, wireless charging technology was proposed for charging mine-used portable methane detector. Wireless charging circuit was designed. On the basis, prototypes of mine-used portable methane detector and wireless charger were developed. The experimental result shows that wireless charging technology can charge mine-used portable methane detector reliably and safely. Distance between sending coil and receiving coil should be smaller for higher energy transfer efficiency.

Prediction of coal and gas outburst based on catastrophe progression method

SHEN Zhiwei, WANG Enyuan, NIU Yue

2015, 41(5): 29-34. doi: 10.13272/j.issn.1671-251x.2015.05.008

<Abstract>(45) <PDF>(4)

Abstract:
In view of problem that inner mechanism of coal and gas outburst was very complex and it was difficult to establish an appropriate multivariate nonlinear prediction model, prediction method of coal and gas outburst based on catastrophe progression method was proposed. The method chooses coal and gas outburst instances of typical outburst mine as learning samples to determine catastrophe progression with different levels of impact risk, and uses them to predict the other samples. The actual application results show that the method can accurately reflect risk degree of coal and gas outburst and has high prediction accuracy.

Design of a compact broadband circularly polarized RFID antenna

HUANG Kai, ZHANG Ran, BEI Lulu

2015, 41(5): 34-38. doi: 10.13272/j.issn.1671-251x.2015.05.009

<Abstract>(59) <PDF>(3)

Abstract:
For problem that existing circularly polarized antenna is difficult to meet requirements of broadband and miniaturized application simultaneously, a compact broadband circularly polarized RFID antenna for global ultrahigh frequency(UHF) RFID read-write application was designed by use of a new type of power-dividing phase-shifting feed network, rotating short-circuit radiation patch and coupled patch as well as feed probe and grounding probe. The experimental results show that relative bandwidths of the antenna are 59% and 34% respectively when return loss is greater than 15 dB and axial ratio is less than 3 dB. Within the frequency band of global UHF RFID, antenna radiation gain is greater than 2.7 dB with symmetric and stable radiation direction, and half power beam width is greater than 101° which is suitable for wide angle reading and writing. By comparing performance and structure of the designed antenna with existing circularly polarized RFID antenna, it is found that the operating frequency band of the antenna not only covers global UHF RFID frequency, but also has compact structure which is in favor of design and implementation of RFID system with low cost.

Suggestions for parts revision of coal mine safety regulations based on information technology

DING Zhen, YANG Hanhong, MENG Feng

2015, 41(5): 39-44. doi: 10.13272/j.issn.1671-251x.2015.05.010

<Abstract>(35) <PDF>(6)

Abstract:
Based on information technology and construction of Shenhua intelligent demonstration mine, the modification, supplement and perfect suggestions for parts revision of coal mine safety regulations were put forward: the maximum CO allowable concentration is 0.005 0% in mine used diesel rubber-tyred car to transport coal; automatic door with interlock function and reverse functions should't set reverse door; main ventilator and its ancillary equipment should't arrange full-time driver with functions of remote measuring, remote communication, remote control, automatic switching, industrial video surveillance and operator on duty with a mobile communication to carry out inspection, and the operator on duty can get main ventilator room facility within 10 minutes; coal mine safety monitoring equipment and industrial Ethernet ring network can be shared cable, but should not use co-channel; mine-used general type diesel rubber-tyred car should be used in main haulage roadway with low gas mines intake (wind pressure ventilation) DC voltage of stringing rubber-tyred car should not be more than 1 500 V; a special security measures must formulate when voltage of electrical equipment of mining area is higher than 3 300 V; specially-assigned person on duty should not arrange for substation with function of remote monitoring and control, unattended substation cavern should have functions of remote sensing, remote communication, remote control and remote viewing.

Research of evaluation criterion of equipment selection of mining face using continuous miner and selection system

ZHANG Zhendong

2015, 41(5): 44-48. doi: 10.13272/j.issn.1671-251x.2015.05.011

<Abstract>(33) <PDF>(2)

Abstract:
In order to realize scientization, intelligentization and rapidity of equipment selection in complex geological conditions of working face, a set of mining equipment selection criterion was summarized according to field experience and statistical data, which made the criterion more quantitative, and equipment selection system was designed using LabVIEW. The system can select reasonable equipments to adapt to working face conditions by calling equipment database. The comparing results of system selection and artificial selection results show that the system selection results are more comprehensive, fast, accurate and effective.

Research of energy consumption of mine-used terminal node

LIANG Zuosheng

2015, 41(5): 48-51. doi: 10.13272/j.issn.1671-251x.2015.05.012

<Abstract>(22) <PDF>(2)

Abstract:
By analyzing low power consumption mode of CC2530 and sleep or wake-up mechanism of Z-Stack protocol stack based on ZigBee protocol, a terminal node of mine wireless sensor network was designed which was based on CC2530. Energy consumption of the terminal node was tested through a measurement method based on Fluke multimeter. Conclusions are as following. Current consumption is the maximum when the terminal node establishes a connection with a coordinator, but smaller in sleep or wake-up mode. Average operating current of the terminal node is less affected by transmitting power. Sleep cycle of the terminal node directly affects current consumption, and the longer the sleep cycle, the lower the energy consumption.

Research of impact factors of wire rope flaw detector based on principle of magnetic flux leakage

ZHANG Cao, ZHU Chengjian, LIU Jiankang

2015, 41(5): 52-54. doi: 10.13272/j.issn.1671-251x.2015.05.013

<Abstract>(114) <PDF>(3)

Abstract:
The paper introduced magnetic flux leakage testing principle of wire rope flaw detector, and used finite element analysis method to analyze impact factors of detection results of wire rope flaw detector based on flux leakage testing principle, the impact factors include material of sensor parts, rope lift-off distance and number of broken wires. The analysis results show that the factors of lift-off distance and the number of broken wires have large impact on detection results of wire rope flaw detector, and the factors of angle and depth of broken wires has little impact on detection results of wire rope flaw detector.

Discussion on ia grade explosion-proof type of gas drainage pipeline equipment

BAI Sizhong

2015, 41(5): 55-57. doi: 10.13272/j.issn.1671-251x.2015.05.014

<Abstract>(50) <PDF>(5)

Abstract:
Requirements of ia grade explosion-proof type of gas drainage pipeline equipment were analyzed, and realization scheme of ia grade pipeline equipment was gave from aspects of parallel pressure limiting circuit, series current limiting circuit and isolating circuit. In view of equipments connection of power supply circuit and signal transmission link in gas drainage monitoring system, design schemes of power supply circuit with ia grade, substation level equipment with ib/ia conversion and adding ib/ia converter were proposed. The field application verifies reliability of the schemes.

Research on topology of magnetically-coupled resonant wireless power transmissio

WANG Guodong, QIAO Zhenpeng, WANG Saili, YUAN Lulu, WANG Yunjia

2015, 41(5): 58-63. doi: 10.13272/j.issn.1671-251x.2015.05.015

<Abstract>(50) <PDF>(3)

Abstract:
The paper analyzed relationships between output power, transmission efficiency and frequency, load and distance of four kinds of topology model of magnetically-coupled resonant wireless power transmission, and concluded: the topology with series connection of capacitor and inductance in transmitting coil, and parallel connection of capacitor and inductance in receiving coil is more suitable for conditions of low frequency, high load and long distance; the topology with series connection of capacitor and inductance in both transmitting coil and receiving coil is more suitable for conditions of relative short distance, high frequency and small load. Output voltage and current waveforms of four kinds of topology model under the same parameters were gotten by Matlab simulation, which verifies correctness of theoretical analysis.

A kind of leakage detection method of mine DC power supply system

WANG Ming, LI Wei, YANG Hai

2015, 41(5): 63-67. doi: 10.13272/j.issn.1671-251x.2015.05.016

<Abstract>(73) <PDF>(5)

Abstract:
In view of problem of traditional leakage detection method of DC power supply system in overhead line system that it has detection dead zone and big voltage deviation between bus and ground, a new kind of leakage detection method based on balancing bridge method and switching bridge method was proposed. Detection principle of the method was analyzed and computational model of balancing resistors and switching resistors were established from the perspective of lowering voltage deviation between bus and ground. The Simulink simulation results show that the new method can reduce voltage deviation between bus and ground, and improve stability of the power system.

A new method of narrowband interference suppression of partial discharge signal based on resonance sparse decompositio

WANG Hongtao, ZHENG Naiqing, LIU Huijun

2015, 41(5): 68-73. doi: 10.13272/j.issn.1671-251x.2015.05.017

<Abstract>(23) <PDF>(2)

Abstract:
For problem that partial discharge signal of electrical equipment is easy to be overwhelmed by narrowband interference signal in field operation environment, and is difficult to extract, a new method of narrowband interference suppression of partial discharge signal based on sparse decomposition resonance was proposed. Quality factor, redundancy factor, decomposition level and the weight coefficients were analyzed and selected, sparse decomposition of partial discharges signal with narrowband interference was realized according to the oscillation characteristics of partial discharge signals and narrowband signal. The partial discharges signal with narrowband interference was decomposed into high resonance component, low resonance component and residual component, so as to extract effective partial discharge signal. The method can effectively suppress narrowband interference, and has small error and high similarity compared with wavelet transform threshold filtering method. The results of simulation and experimental data demonstrate the effectiveness of the method.

Research of regression analysis of coal and gas outburst risk and gas emission characteristic value on mining face

QU Shijia

2015, 41(5): 74-77. doi: 10.13272/j.issn.1671-251x.2015.05.018

<Abstract>(46) <PDF>(3)

Abstract:
Relationship of coal and gas outburst risk and gas emission characteristic value on mining face was analyzed. Through taking the average and maximum amount of gas emission and data slope of gas concentration of fallen coal as gas emission characteristic value, a regression analysis method of coal and gas outburst risk and gas emission characteristics value on mining face was proposed combining with coal and gas outburst risk indicators. The application of examples shows validity of the method.

Three-dimensional positioning algorithm based on TDOA and AOA in coal mine underground

WANG Feng, SHANG Chao, JI Jincheng, NIE Baisheng, QIAO Tiezhu, ZHANG Xueying

2015, 41(5): 78-82. doi: 10.13272/j.issn.1671-251x.2015.05.019

<Abstract>(59) <PDF>(8)

Abstract:
In view of problem that positioning accuracy of existing underground positioning algorithm is difficult to meet actual demand, a three-dimensional positioning algorithm based on TDOA and AOA used in coal mine underground was proposed combining with special environmental conditions in coal mine underground. The positioning algorithm uses sensor base station to measure the time difference that radiation emitted by unknown node arrived to different base stations and relative angle between them, and realizes positioning through coordinate information of the unknown node and base station itself. The simulation results show that the algorithm based on TDOA and AOA can effectively eliminate the noise and random error of measurements, and improves positioning accuracy combining with positioning model.

Coal-rock recognition and control system of shearer based on vibration characteristics analysis

WANG Shuisheng

2015, 41(5): 83-87. doi: 10.13272/j.issn.1671-251x.2015.05.020

<Abstract>(60) <PDF>(8)

Abstract:
In order to solve problems of coal-rock recognition and automatic height regulation control of shearer during cutting process, a kind of coal-rock recognition and control system of shearer was put forward and designed which was based on vibration characteristics analysis. The system detects vibration signals of three directions of shearer drum in process of cutting coal and rock, and uses PLC to analyze and process the vibration data, so as to obtain law of vibration characteristics of the shearer drum in process of cutting coal and rock. Then it establishes automatic height adjustment control rule table of shearer drum, and realizes automatic height regulation control of shearer drum by using closed loop control method combining with online discrete look-up table of feedback signal error and control signal output. The results of similar simulation cutting test show that the system can realize coal-rock interface recognition and automatic height regulation control of shearer drum with good dynamic performance.

Trajectory generation algorithm of inertial navigation based on smart phone

WANG Zhenghe

2015, 41(5): 87-90. doi: 10.13272/j.issn.1671-251x.2015.05.021

<Abstract>(36) <PDF>(5)

Abstract:
In view of problem that traditional inertial navigation technology of mobile phone is unable to calculate steps or step length accurately, a trajectory generation algorithm of inertial navigation based on smart phone was put forward. The walking steps of people are calculated by use of step counting algorithm based on Mealy state machine according to three-axis accelerations of walking people captured by three-axis acceleration sensor of smart phone, and start-stop timestamp of each step is gotten. Direction change of each step is calculated according to data of three-axis gyroscope and the start-stop timestamp of each step combined with compass reading. Step length is estimated based on the least square method considering different acceleration of walking people with different step length. Coordinate relative to starting point of each step is calculated on the basis of coordinate of the starting point, step length and direction change, so as to get movement trajectory of people. The simulation result shows that the algorithm can achieve high accuracy of inertial navigation.

Experimental study on pressure impact and vibration of long-distance coal slime transportation pipeline

LYU Fuyan, JIA Xuankai, LIU Yayun, XIA Zhengmeng, HAO Xuedi, WU Miao

2015, 41(5): 91-94. doi: 10.13272/j.issn.1671-251x.2015.05.022

<Abstract>(40) <PDF>(2)

Abstract:
Pressure and vibration signals of pump outlet of long-distance coal slime transportation pipeline were tested in industrial field, so as to determine reversing of S type pipe valve is direct cause of pipeline pressure impact and vibration. Conclusions were gotten through further analysis of pressure and vibration signals before and after reversing of the S type pipe valve by changing pumping output. Intensity of pipeline pressure impact and vibration increases with pumping output and axial vibration intensity is greater than radial vibration intensity when the pumping output is less than 75%. And the smaller the pumping output, the more intense the axial vibration compared to the radial vibration. Pressure impact and vibration of pipeline is less affected by the pumping output variation when the pumping output exceeds 75%.

Hot standby system of coal mine based on export/import function of database

MA Zunyun, YIN Dafa

2015, 41(5): 95-99. doi: 10.13272/j.issn.1671-251x.2015.05.023

<Abstract>(56) <PDF>(2)

Abstract:
In view of requirements of hot standby system of small and medium coal mine, the paper proposed an implement scheme of software solution of hot standby system based on export/import function of database. It introduced synchronization strategy, network transmission, implementation process in details, and elaborated functions and processes such as task switching and transparent access.The scheme has characteristics of high efficiency, good fault tolerance, easy deployment and stable operation, and can meet common technical requirements of coal industry to hot standby system.

Design of wireless audio and video terminal of mine

WANG Zhengjin, LI Guomin, WU Fengbo, ZOU Zhenhua, CHEN Linchao

2015, 41(5): 103-105. doi: 10.13272/j.issn.1671-251x.2015.05.025

<Abstract>(35) <PDF>(3)

Abstract:
Structure and design schemes of hardware and software of a wireless audio and video terminal of mine were introduced. Transmitting terminal is designed by use of S3C6410 processor as well as receiving terminal, which is low in cost. Software of the terminal is based on Linux embedded operation system with good real-time performance and stability. Audio and video data is transmitted through wireless WiFi network. The test result shows that CPU using ratio is less than 5% when the terminal transmits data normally; transmitting distance is about 100 m indoor and 300 m outdoors.

Design of differential pressure type gas drainage flow meter with dynamic compensatio

YANG Xujun, WANG Wenlong, GAO Wenping, ZHU Chengjia

2015, 41(5): 106-108. doi: 10.13272/j.issn.1671-251x.2015.05.026

<Abstract>(22) <PDF>(2)

Abstract:
In view of problem of large flow measurement error caused by existing gas drainage flow meter which cannot realize real-time compensation for pipeline flow parameters, a differential pressure type gas drainage flow meter with dynamic compensation was designed. The compensation methods of gas temperature, pressure and concentration were gave, and design schemes of hardware and software of the flow meter were introduced. The field test results show that the flow meter meets accuracy requirement of coal mine gas drainage measurement with accurate and stable data.

Design of wireless charging device for mine-used portable gas detector

ZHANG Xinchao, WU Yincheng, HUANG Shaoji

2015, 41(5): 109-112. doi: 10.13272/j.issn.1671-251x.2015.05.027

<Abstract>(18) <PDF>(3)

Abstract:
In view of problem of mine-used portable gas detector using battery for power supply that battery has limited capacity, and bad contacts can affect battery charging effects, design scheme of wireless charging device for mine-used portable gas detector based on wireless power transmission technology was proposed. Wireless power transmission circuit converts DC power to high-frequency AC electromagnetic wave signal, and transmits it into the air through coil. Wireless power receiving circuit couples electromagnetic wave signal in the air through coil, and converts it to DC signal by rectifier filter, so as to provide power to mine-used portable gas detector. The test results show that the device can output stable DC voltage and has high transmission efficiency.

Comprehensive prediction of coal seam gas emission quantity on fully-mechanized working face in highly gassy mine

ZHANG Jiasuo, REN Weijie

2015, 41(5): 112-115. doi: 10.13272/j.issn.1671-251x.2015.05.028

<Abstract>(27) <PDF>(2)

Abstract:
In order to successfully predict coal seam gas emission quantity on fully-mechanized large mining height working face in Zhulinshan highly gassy mine, the main mining No.3 coal seam was identified as the main research object. In allusion to the mining situation of No.3 coal seam, gas content of the No.3 coal seam was measured and the gas content in the adjacent mines was understood through laying some measurement points, the distribution regularities of gas content in the No.3 coal seam was obtained by use of separate source method, the regression method and the statistical method, and the contour map of gas content in the No.3 coal seam was drawn. The largest absolute gas emission and the maximum relative gas emission of district in the early period,the middle period and the later period of the production were gotten through predicting gas content in different production period, and it was proved that Zhulinshan Coal Mine is a highly gassy mine in different production period.

Development and application of OPC server based on ASOPCDA.DLL dynamic link library

JING Jing

2015, 41(5): 116-118. doi: 10.13272/j.issn.1671-251x.2015.05.029

<Abstract>(55) <PDF>(2)

Abstract:
In view of problem that existing coal automation control system has many different communication protocols, data conversion and data integration are difficult, an OPC server based on ASOPCDA.DLL was developed, and its development flowchart and application in coal preparation plant were introduced. The server can convert different communication protocols into a universal OPC communication protocol, and it will be convenient for the data integration to the device by upper layer software, which provides communication protocol basic support for informatization.

Design of cost management information system of coal mine construction project

ZHANG Liping, JIN Xiangyang

2015, 41(5): 119-122. doi: 10.13272/j.issn.1671-251x.2015.05.030

<Abstract>(40) <PDF>(2)

Abstract:
To solve the problem of scattered cost information, coarse statistical granularity, low efficiency existed in current cost management system of coal mine construction project, a design scheme of cost management information system based on Java EE platform and B/S multilayer architecture technology was proposed, the design ideas, goals and architecture of the system were introduced in details.

2015 Vol. 41, No. 5

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