2015 Vol. 41, No. 1

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New technologies and new equipments of coal mine monitoring
SUN Jiping
2015, 41(1): 1-5. doi: 10.13272/j.issn.1671-251x.2015.01.001
<Abstract>(65) <PDF>(8)
Abstract:
The paper analyzed the national coal production，the total number of accidents, the death rate per million tons and the changes of serious accidents. On average per year, the coal production had increased by 194 million tons, the number of accidents had decreased by 337, the death number of personnel had decreased by 551 and the death rate per million tons had decreased by 0.310.It proposed that mine-used thermal catalytic methane sensor should be used in low gas mine and high gas mine, mine-used laser methane sensor should be used in coal (rock) and gas outburst mine; mine-used wireless sensor should be used in the upper corner of working face, on heading face, in high risk location and on mining equipment and transportation equipment, and the mine-used wireless sensor should use wireless power transmission to supply power; mine-used gas telemetering sensor should be used for gas detection in inconvenient place for people to reach such as area of harmful gas advanced detection by the rescue team, the area of goaf and high risk roof; the automatic zero set of sensor should be used in portable gas detector and wireless sensor. It also put forward axial layout method and serpentine layout method for monitoring fire accident in goaf of mine-used distributed fiber temperature measurement system; the mine-used distributed fiber temperature measurement system should be used to monitor fire accident of underground coal mine belt, cable and electrical equipment. Meanwhile, it proposed that automatic coal mining should use memory coal cut mode based on coal mining model and remote control method, energy saving control of belt conveyor should use laser belt scale and mine power supply system should use fiber longitudinal differential protection and fiber interlock and comprehensive anti override trip system.
Research of health status evaluation method for large electromechanical equipment
LI Jin, ZHU Qiangqiang, FAN Xufeng, MENG Yang, CHEN Si'a
2015, 41(1): 6-9. doi: 10.13272/j.issn.1671-251x.2015.01.002
<Abstract>(70) <PDF>(6)
Abstract:
According to characteristics of complexity of health status evaluation of large electromechanical equipment, and nonlinear, fuzzy and grayscale of the impact factors, the paper constructed evaluation index system of health status of equipment from three aspects of product quality, operational states and historical data, and designed stratified comprehensive evaluation model of health status of equipment based on fuzzy-gray-variable weight summation. Mine-used belt conveyor was selected to verify the comprehensive evaluation model, and the results showed that the actual operation status of equipment was consistent with the results of assessment derived using the model. The comprehensive evaluation model has an important actual significance for health status evaluation for large electromechanical equipment and safety production.
Research of height of water flowing fractured zone of overburden strata in fully-mechanized top-coal caving
ZHANG Hui, ZHU Shuyun, LI Xiuhan, LI Tao, MENG Fanzhen
2015, 41(1): 10-14. doi: 10.13272/j.issn.1671-251x.2015.01.003
<Abstract>(29) <PDF>(3)
Abstract:
In order to provide theoretical basis of roof water disaster prevention of No.3 coal seam in a working face after fully-mechanized top-coal caving, empirical formulas in Regulations of building, water, railway and leaving coal pillar and mining pressed coal in main shaft and drift, numerical simulation and underground up-hole water injection method by intervals were respectively adopted to study height of water flowing fractured zone of overburden strata of working face. Estimated values by empirical formulas are 51.1 m and 59.0 m respectively, calculated value by numerical simulation is 63.5 m, and measured value is 65.4 m. Height of water flowing fractured zone under the researched geological condition is about 63.5-65.4 m after comprehensive comparison and analysis. Sandstone aquifer of Shanxi formation is in the water flowing fractured zone and belongs to direct water filling aquifer. The water flowing fractured zone is not spread to Shihezi sandstone aquifer and Neogene loose aquifer. Normal fully-mechanized top-coal caving will not influence on water gushing in working face directly.
Design of personnel positioning system of special coal mine
WANG Wei, HUO Zhenlong, LING Yun, TAN Dake
2015, 41(1): 14-17. doi: 10.13272/j.issn.1671-251x.2015.01.004
<Abstract>(53) <PDF>(4)
Abstract:
For demand of positioning of ground personnel of special coal mine besides to underground personal, the paper proposed a design scheme of personnel positioning system of special coal mine which uses dual-frequency. It introduced system structure and basic working principles, and mainly analyzed key technologies of hardware and software function design of the system. The system realizes all-dimensional tracking and positioning of all personnel of the special coal mine by low-frequency localizer, and improves management efficiency and raises safety level of special coal mine.
Application of join algorithm in coal mine safety productio
HUANG Weili, LIU Ying
2015, 41(1): 18-20. doi: 10.13272/j.issn.1671-251x.2015.01.005
<Abstract>(29) <PDF>(3)
Abstract:
The paper analyzed influence factors of coal mine safety production, and introduced large data technology to analyze data of coal mine safety production. It also put forward a star join algorithm based on Bloom filter to deal with the problems of multi-table connection in process of large data analysis. The experimental results show that the algorithm can improve efficiency of using large data to analyze coal mine safety production data in space and time compared with the traditional algorithm.
Design of pressure and temperature monitoring system of coalbed methane well
ZHOU Xing, KONG Shanyou, DING Enjie, SHEN Jian
2015, 41(1): 21-24. doi: 10.13272/j.issn.1671-251x.2015.01.006
<Abstract>(40) <PDF>(2)
Abstract:
In order to solve problems of existing pressure and temperature data collecting modes of coalbed methane well such as information island caused by manual collection, inability to collect data consecutively, water leakage of pressure sensor and temperature sensor and so on, a pressure and temperature monitoring system of coalbed methane well was proposed. System structure was given as well as compositions of hardware and software. Design scheme of a new type of sensor was focused on, which adopted MEMS technology, vacuum encapsulation and resistive load modulation mode to send collected data. Testing and trail running results show that the system has better reliability, real-time performance and operability, which can reduce field personnel and accidents effectively.
Establishment of intelligent pre-warning platform of mine gas geology and its applicatio
CUI Junfei, TANG Hanying
2015, 41(1): 25-29. doi: 10.13272/j.issn.1671-251x.2015.01.007
<Abstract>(42) <PDF>(6)
Abstract:
In view of current situations that there was no effective management of gas geological data in coal mine enterprises and gas geological maps were updated hardly with low utilization, an establishment scheme of intelligent pre-warning platform of mine gas geology were proposed from gas geology pre-alarming principle, database establishment, platform structure, function models, key technologies, pre-alarming guarantee mechanism, etc. In the platform, GIS technology is used to build spatial database of gas geology, so as to manage relative gas geological data intensively and effectively and update gas geological maps automatically. WCF technology is used for data sharing of relative gas geological maps in different graph platforms. Based on gas geology theory, a set of integrated pre-warning index system of gas geology is established, which is for real-timely pre-warning gas geology through comprehensively analyzing gas occurrence, geological structure and coal-seam occurrence in front of working face. Application shows that each pre-alarming result of the platform accords with measuring result in filed with good effect.
Estimation method of state of charge of lithium battery for nodes of wireless sensor network
YANG Lei, YANG Yi, YANG Dongyong, GU Dongyua
2015, 41(1): 29-32. doi: 10.13272/j.issn.1671-251x.2015.01.008
<Abstract>(46) <PDF>(2)
Abstract:
In view of problem of big estimation error of estimation method of state of charge using lithium battery detection chip DS2786, an estimation method of lithium battery for nodes in wireless sensor network was proposed combined with DS2786 chip and Kalman filter algorithm. In the method, equivalent circuit model which can characterize lithium battery was built, and the open circuit voltage and discharge current of lithium battery obtained by the chip DS2786 were taken as input parameters of Kalman filter algorithm to accurately estimate the state of charge. Experimental results show that the method has estimation error of state of charge of lithium battery less than 3%, low computational complexity, and can meet the application requirements of embedded devices.
Evaluation of application level of Internet of Things for coal mine
LI Xiangong, LU Juan, WANG Haojia
2015, 41(1): 36-40. doi: 10.13272/j.issn.1671-251x.2015.01.010
<Abstract>(19) <PDF>(2)
Abstract:
Based on the standard system of Internet of Things， evaluation index system of application level of Internet of Things for coal mine was established, index system evaluation model of application level of Internet of Things for coal mine was given by use of fuzzy comprehensive evaluation method. Taking construction of Internet of Things for a coal mine for example, the evaluation model is validated and analyzed. The analysis results show that the evaluation model can objectively reflect the realities and lack of application level of Internet of Things for coal mine, and can provide reference for development strategy of Internet of Things for coal enterprises.
Study on fault diagnosis technologies of motor
WANG Huizhong, XIAO Yingchun, ZHANG Ying, ZHU Hongyi
2015, 41(1): 40-44. doi: 10.13272/j.issn.1671-251x.2015.01.011
<Abstract>(29) <PDF>(8)
Abstract:
The paper introduced types and causes of common electrical and mechanical faults of motor, and described application of signal processing methods and intelligent diagnosis methods in fault diagnosis of motor. The signal processing methods include short-time Fourier transform, wavelet transform, wavelet packet transform and empirical mode decomposition. The intelligent diagnosis methods include expert system, fuzzy theory, support vector machine and neural network. It also pointed out development trend of fault diagnosis technologies of motor is combination of multiple diagnosis methods and information fusion method.
Real-time fault monitoring technology for coal mine conveying belt
WANG Jianxu
2015, 41(1): 45-48. doi: 10.13272/j.issn.1671-251x.2015.01.012
<Abstract>(27) <PDF>(12)
Abstract:
Common faults of coal mine conveying belt were analyzed as well as their causes, including splice breaking, longitudinally tearing, sideslipping, coal-water mixture and conny piling up, etc. Existing monitoring technologies for common faults of coal mine conveying belt were summarized as well as their main problems. For the problem that existing monitoring technologies only alarm after faults but cannot pre-alarm, an intelligent detecting and pre-alarming system for coal mine conveying belt was proposed which was based on machine vision.
Impact of obstacles on transmission efficiency of magnetic coupling resonant wireless power transmission system
TIAN Zijian, DU Xinxin, ZHU Yuanzhong, WANG Juan
2015, 41(1): 49-53. doi: 10.13272/j.issn.1671-251x.2015.01.013
<Abstract>(11) <PDF>(4)
Abstract:
Requirements of coal mine underground were analyzed for wireless power energy transmission. Characteristics of three kinds of wireless power transmission technologies were researched including microwave type, electromagnetic induction and magnetic coupling resonant type as well as their applicability in coal mine underground. It was considered that magnetic coupling resonant type wireless power transmission technology could be applied in coal mine underground. Impacts of different obstacles were analyzed emphatically on transmission efficiency of magnetic coupling resonant wireless power transmission system. A simulation model of magnetic coupling resonant wireless power transmission system was built by using HFSS 3D electromagnetics simulation software, and simulated experiments were carried out using metallic obstacles and the nonmetallic ones. The experimental results show that nonmetallic obstacles have no influence on transmission efficiency of the system, and metallic obstacles reduce transmission efficiency, especially in condition of adding thickness or reducing lateral area of the metallic obstacles.
Facial contour extraction method of underground personnel
NIU Yumei, CHEN Lichao, PAN Lihu
2015, 41(1): 53-57. doi: 10.13272/j.issn.1671-251x.2015.01.014
<Abstract>(22) <PDF>(7)
Abstract:
For low identification ratio of attendance system of coal mine caused by difficult facial contour extraction of underground personnel, a facial contour extraction method was proposed based on active contour model (Snake model) and active shape model (ASM). Firstly, the initial contour position is estimated by ASM. Secondly, the gap between marker and real contour is narrowed after multiple iterations by Snake algorithm through defining energy function of Snake model. Finally, gray value contour of orthogonal interpolation obtained by ASM are extracted, so as to get facial contour. Experimental results show that the method can extract facial contour more accurately than traditional Snake model.
An early fault detection method of steel cord conveyor belt
XIE Fei, ZHANG Xueying, QIAO Tiezhu, YANG Yang
2015, 41(1): 58-62. doi: 10.13272/j.issn.1671-251x.2015.01.015
<Abstract>(32) <PDF>(5)
Abstract:
In view of problem that using traditional wavelet transform to analyze singularity of metal magnetic memory signal easily suffered from noise interference, an early fault detection model combining empirical mode decomposition with wavelet transform was proposed. Firstly, metal magnetic memory signal of steel cord conveyor belt is decomposed into intrinsic mode function components through empirical mode decomposition, then singularity characteristic of the signal is extracted by use of wavelet transform modulus maxima method. The experimental results show that the model can reflect local characteristic of the signal with stronger anti-interference ability, and determine abnormal stress concentration zone of steel cord conveyor belt effectively, which provides basis for early fault diagnosis.
Research of a data preprocessing method for near infrared spectrum of coal
LI Ming, LI Cui, LEI Meng
2015, 41(1): 62-66. doi: 10.13272/j.issn.1671-251x.2015.01.016
<Abstract>(26) <PDF>(5)
Abstract:
For noise existed in original near infrared spectral data of coal, a data preprocessing method for near infrared spectrum of coal was proposed based on De-SNV and wavelet threshold denoising. Spectrum data processed by Savitzky-Golay smoothing and De-SNV was further processed by default soft threshold denoising method. Then PLS calibration models of moisture, ash and volatile were established. Effect of the method was evaluated by analyzing predicting performance of the models. The experiments show that performance of PLS model based on spectrum data processed by the method is much better than the one based on original spectrum data. The root-mean-square errors of prediction of the three PLS calibration models are decreased to 0.007 07, 0.040 8, 0.008 66 respectively, and the determination coefficients are increased to 0.858 7, 0.743 8, 0.778 5.
Application research of borehole hydraulic fracturing technology for Linhuan Coal Mine
JIANG Qian, ZHANG Ruilin
2015, 41(1): 67-70. doi: 10.13272/j.issn.1671-251x.2015.01.017
<Abstract>(22) <PDF>(2)
Abstract:
In view of problems of low rate of gas extraction, too many drilling and short period of gas extraction in Linhuan Coal Mine, a method using borehole to implement hydraulic fracturing technology was put forward. The experimental results show that gas standard conditions average scalar was improved 19 times in experimental area of Linhuan Coal Mine, gas extraction cycle was extended more than 3 times, it indicated that the hydraulic fracturing test forms borehole hydraulic fracturing technology applicable to Linhuan Coal Mine. Linhuan Coal Mine is suited to use hydraulic fracturing to realize pressure relief anti-reflection and reducing drilling hole amount.
Drill counting method based on improved Camshift algorithm
DONG Lihong, WANG Jie, SHE Xiangyang
2015, 41(1): 71-76. doi: 10.13272/j.issn.1671-251x.2015.01.018
<Abstract>(20) <PDF>(4)
Abstract:
In view of problem that it is easy to produce interference between objects with the similar colors while using traditional Camshift algorithm for drill tracking, a drill counting method based on improved Camshift algorithm was proposed. Improved Camshift algorithm was used to capture drill targets real timely, and then drill counting was realized by setting anchor and determining time interval. The improved Camshift algorithm uses template matching method to locate tracking target, intelligently selects appropriate method to extract color histogram, meanwhile introduces particle filters to get exact location of the tracking target in the next frame by combining texture features through certain mechanisms. Experimental results show that the improved algorithm solves the interference problem of similar colors, and is still able to accurately track the target in conditions of partial cover, consequently achieves accurate drill counting.
A non-destructive length measuring method for mine-used bolt or anchor cable
ZHANG Xiaobo, WU Yincheng, SUN Zhifei, HUANG Chu
2015, 41(1): 76-79. doi: 10.13272/j.issn.1671-251x.2015.01.019
<Abstract>(17) <PDF>(3)
Abstract:
For problems of complex operations and low measuring precision of existing length measuring methods for bolt or anchor cable, a non-destructive length measuring method for mine-used bolt or anchor cable was proposed which was based on magnetostriction guided wave technology. Length measuring principle of bolt or anchor cable, design scheme of a measuring system and measuring operations were introduced. Speed of the measuring system was calibrated and length of bolt in concrete structure was measured in lab. The experimental results show that the method has the maximum error of 2.66% and average error of 0.33%, which satisfies application requirement of length measurement of mine-used bolt.
Design of an instantaneous monitoring system of mine roadway sectio
LU Zhongliang, FU Teng, FU Tong
2015, 41(1): 80-84. doi: 10.13272/j.issn.1671-251x.2015.01.020
<Abstract>(14) <PDF>(3)
Abstract:
Manual measuring method for mine roadway section is time-consuming and laborious with big error, and existing measuring instruments of roadway section are poor in measuring speed and cannot realize real-time monitoring by upper computer. A design scheme of instantaneous monitoring system of mine roadway section was proposed based on PLC and ZigBee network. PLC of the system outputs two high-speed pulse sequences at 6 400 bit/s to control stepper motor to rotate and drive pulsed laser rangefinder to range respectively. High-speed counters of HC0, HC1 count two pulse sequences respectively. Step angle of the stepper motor is 0.45°. After laser rangefinder rotates 360°, the PLC calculates perimeter and area of roadway section and sends the results to upper computer through ZigBee network for real-time display. The experimental results show that the system updates to display perimeter and area of roadway section every 10 seconds. Relative error of perimeter measuring is no more than 0.5%, and the one of area measuring is no more than 0.9%.
Collection system of omnidirectional vibration energy
ZHANG Xuhui, LIN Ran
2015, 41(1): 84-87. doi: 10.13272/j.issn.1671-251x.2015.01.021
<Abstract>(25) <PDF>(4)
Abstract:
In order to solve problem of energy supply for microelectronic device, a collection system of omnidirectional vibration energy was designed. In the system, vibration energy from any direction is converted into electric energy through vibration energy collection device. Then through energy collection circuit based on LTC3588-1 and LTC4071, on one hand, the electric energy is converted into stable DC voltage for load, on the other hand, redundant energy is stored in battery which discharges to the load at the time of energy lack. The simulation results verify effectiveness and feasibility of the system.
Fault section positioning and ranging method of distribution network
GENG Xingwang, LUO Yanfang
2015, 41(1): 88-91. doi: 10.13272/j.issn.1671-251x.2015.01.022
<Abstract>(22) <PDF>(2)
Abstract:
In view of problem that it is difficult to realize fault positioning by use of artificial patrol after single-phase grounding fault occurred in distribution network, a fault section positioning and ranging method of distribution network based on distributed parameter model was proposed. In the method, fault section is chosen through analyzing and calculating of fault information and date uploaded by feeder terminal unit of line, and fault distance is obtained by online calculating distributed parameters of the section line. The simulation results show that the method is less affected by factors of transition resistance and fault location, which can effectively realize fault line selection and section positioning within 1% ranging error.
Research of a novel current control strategy for active power filters
CHEN Jianyu, AN Qi, SHI Jingcong, ZHOU Xianjiao
2015, 41(1): 92-96. doi: 10.13272/j.issn.1671-251x.2015.01.023
<Abstract>(17) <PDF>(2)
Abstract:
In view of problem of complex structure and tracking difficulty of harmonic current of existing active power filter, a novel current control strategy of active power filter was proposed. The control strategy does not need load current measurement and harmonic detector, but directly extracts harmonic component at the supply side, and combines with conventional proportional-integral and vector proportional-integral controllers to control current of power gird, so as to realize harmonic compensation. Simulation results demonstrate correctness and validity of the strategy.
Prediction of blind fault based on cross-strata drainage boreholes
DU Anping
2015, 41(1): 97-101. doi: 10.13272/j.issn.1671-251x.2015.01.024
<Abstract>(28) <PDF>(1)
Abstract:
In view of limitations of inconvenient information read and big drilling engineering quantity existed in traditional advanced prediction method for blind fault, a prediction method of blind fault based on cross-strata drainage boreholes was put forward, the basic principle of the method was discussed based on the fault characteristics, fault diagnosis methods and steps were expounded by use of the least square principle and Matlab drawing function, and the feasibility of the proposed method was verified by an example. The paper provides a new thought and method for mine advanced geological forecast.
Tracking management system of underground materials based on Internet of Things
DU Na
2015, 41(1): 101-104. doi: 10.13272/j.issn.1671-251x.2015.01.025
<Abstract>(51) <PDF>(2)
Abstract:
In order to solve problems of waste and loss of materials caused by lack of effective control in coal enterprises, a tracking management system of underground materials based on Internet of Things was proposed. Three layers structure of the system was given including perception layer, application layer and network layer. Schemes of function design and technical realization of each layer were introduced. The system uses radio frequency identification technology and handled smart terminal to realize tracking management of underground materials during full life cycle, so as to reduce material waste and loss.
Development of a mine-used flame sensor
ZHU Chengjian, YUAN Fengpei, QIU Yu, WANG Wenlong
2015, 41(1): 105-107. doi: 10.13272/j.issn.1671-251x.2015.01.026
<Abstract>(10) <PDF>(2)
Abstract:
For problems of exiting flame sensors based on infrared detection principle such as short detection distance, long response time and so on, a mine-used flame sensor was developed based on ultraviolet light detection principle. Mathematical model of signal modulation circuit of ultraviolet phototube was established through experiments for calculating circuit parameters to improve response speed of the ultraviolet phototube. Power source and signal transmission circuit were designed with electro magnetic compatibility, so as to improve anti-interference ability of the sensor. The test result shows that the sensor has fast response speed, strong anti-interference ability and good stability and reliability.
Testing method of coal mine safety monitoring and control system based on QTP
ZHANG Haimei
2015, 41(1): 108-110. doi: 10.13272/j.issn.1671-251x.2015.01.027
<Abstract>(15) <PDF>(6)
Abstract:
For the problem that current testing methods of coal mine safety monitoring and control system cannot automatically add basic data, a testing method of coal mine safety monitoring and control system was proposed based on automatic testing tool QTP, and operating steps of automatically adding basic data and testing functions were introduced by use of QTP.
Design of remote monitoring and control system of mine water level based on single-chip microcomputer and LabVIEW
XING Xuening, LUO Yonggang, LI Tianze, JI Hua
2015, 41(1): 111-113. doi: 10.13272/j.issn.1671-251x.2015.01.028
<Abstract>(51) <PDF>(5)
Abstract:
In view of problems of complex structure and no remote monitoring of existing monitoring and control system of mine water level, a remote monitoring and control system of mine water level based on single-chip microcomputer and LabVIEW was designed, and hardware structure, communication between PC and lower machine, software design of the system were introduced. The system uses single-chip microcomputer to monitor water level and control water pump in field，uses LabVIEW to monitor water level and store the water level in database, and realizes remote monitoring of coal mine water level.
Reliability evaluation of mine ventilation system
ZHANG Congcong, WU Shiyue, AN Xingwei, XUE Liping, WU Qinglin
2015, 41(1): 114-118. doi: 10.13272/j.issn.1671-251x.2015.01.029
<Abstract>(21) <PDF>(6)
Abstract:
Based on comprehensive analysis of factors that affect reliability of mine ventilation system, a reliability evaluation index system of coal mine ventilation system was established with 13 main factors as evaluation indexes. Principal component analysis was used to reduce 13 evaluation indexes to 4 comprehensive indexes while getting weight of each comprehensive index according to contribution ratio. Grey relational analysis was adopted to construct reliability evaluation model of coal mine ventilation system, so as to get reliability value of each mine ventilation system. The practicability of the reliability evaluation method of mine ventilation based on principal component analysis and grey relational analysis was verified by an example.
Application of 3D design method in design of underground mine development
WU Tao, LIU Bingfeng, LIN Jifei, DONG Juan, FENG Xinglong
2015, 41(1): 119-122. doi: 10.13272/j.issn.1671-251x.2015.01.030
<Abstract>(19) <PDF>(2)
Abstract:
In view of problem that it was difficult to quickly and effectively obtain the best mining scheme by using two-dimensional design method, application foundation of 3D design method, "face + slicing", the creating of 3D roadway engineering models and statistical function of design objective were systematically introduced. 3D design method was used to design development system of an iron ore in Yunnan, and various schemes were compared and analyzed to determine the reasonable development scheme.

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