2016 Vol. 42, No. 7

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Cover Catalogue
Design of a new type of integrated test bench for mine-used high-voltage protector
HUANG Hesong, BI Zhongsi, XUE Lin, ZHANG Xiangyang
2016, 42(7): 1-4. doi: 10.13272/j.issn.1671-251x.2016.07.001
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Abstract:
A new type of integrated test bench for mine-used high-voltage protector was designed. The overall structure and design schemes of software and hardware of the test bench were introduced. Fault signals are provided by the test bench which takes S7-300 PLC as a controller such as short-circuit current, over current, under-voltage, over-voltage, zero sequence over-voltage, zero sequence over-current and so on. Fault information, test items and relative hardware running status are displayed on monitoring interface of upper computer so as to detect performance of high-voltage protector quickly. Function of the test bench was tested by taking current protection function test of ZBT-11 type high-voltage protector as an example. The test result shows that the test bench can detect faults of high-voltage protector quickly and accurately. The practical application verifies perfect effect of the test bench.
Design of mine-used wireless radar material level sensor
LI Jilai
2016, 42(7): 5-7. doi: 10.13272/j.issn.1671-251x.2016.07.002
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Abstract:
For problems of difficult setting, maintenance and wiring and high maintenance cost of radar material level sensor in existing coal bunker material level monitoring system, a mine-used wireless radar material level sensor was designed. The sensor takes ESP8266 single chip microcomputer with a wireless radio frequency module as a core processor and a radar sensor as sensing unit. In an environment with WiFi network coverage, the sensor can be directly connected to the WiFi network. In an environment without WiFi network coverage, the sensor can be used as a wireless access point to establish a WiFi network. The sensor can provide web services to communicate with mobile devices for data transmission and sensor configuration. Meanwhile, the sensor can access mine-used information collection station in existing coal bunker material level monitoring system with a flexible application.
Design of carbon monoxide sensor based on wireless Mesh network technology
ZHAO Qingchua
2016, 42(7): 8-11. doi: 10.13272/j.issn.1671-251x.2016.07.003
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Abstract:
A carbon monoxide sensor based on wireless Mesh network technology was designed according to usage characteristics of sensor equipment in mobile environment of coal mine working face, and hardware circuit design and its low power consumption work mechanism were introduced in details. The test results show that the sensor realizes real-time and accurate on-line monitoring of underground carbon monoxide concentrations and has characteristics of fast networking speed, strong ability of anti-interference and obstacle avoidance, long wireless communication distance and low power consumption, which especially is suitable for application on working face with more equipment and complex environment.
Design of mine-used wind speed sensor based on DDS technology
MIAO Kebin
2016, 42(7): 12-15. doi: 10.13272/j.issn.1671-251x.2016.07.004
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Abstract:
In view of problem that performance of mine-used wind speed sensor is easy to fall because of poor working conditions, a kind of mine-used wind speed sensor based on DDS technology was designed. The sensor adopts DDS technology to design ultrasonic oscillation circuit with high stability resonance frequency, and uses Karman vortex street principle to achieve real-time, accurate measuring of wind speed value. The experiment result shows reliability of the sensor is high, measurement error is smaller, and anti-interference is strong.
Design of accelerated-life test platform of centrifugal pump based on double circulating lines for isolation measurement
YAO Yu, SONG Jiancheng, HAN Yi, XI Qingxiang, LI Jianhua
2016, 42(7): 15-19. doi: 10.13272/j.issn.1671-251x.2016.07.005
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Abstract:
For the problems of complex failure process and defective failure database for centrifugal pump, an accelerated-life test platform of centrifugal pump based on double circulating lines for isolation measurement was designed. The platform uses sand particle diameter and particle concentration as accelerated life stress factors of centrifugal pump, and selects flow-head curve as evaluation index of its life. The test results show that the platform can accelerate failure process of centrifugal pump, and can implement centrifugal pump characteristic curve fitting and on-line measurement of test data， which satisfies requirement of accelerated life tests.
Design of drive and control system of 4-quadrant converter for traction shearer
DENG Yonghong, CAO Haokun, ZHANG Quanzhu
2016, 42(7): 20-25. doi: 10.13272/j.issn.1671-251x.2016.07.006
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Abstract:
The paper designed a new drive and control system of 4-quadrant converter for traction shearer according to index requirements of 4-quadrant converter of shearer, and introduced design of hardware circuit and software implementation of the system. The field experiment results show that the system realizes fast braking of shearer, provides continuous braking force for shearer, and improves control performance and reliability of traction operation for shearer, which has good popularization value for engineering applications.
Study on numerical simulation of effective drainage radius of drilling hole in coal seam
WEI Fengqing, CHENG Peidong, ZHANG Junxiang, DU Xiaoqi
2016, 42(7): 25-29. doi: 10.13272/j.issn.1671-251x.2016.07.007
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Abstract:
A seepage-stress coupling model of coal containing gas was established considering effect of coal permeability changing on gas flow based on coal seam gas flow theory and elastic mechanic. The second development of COMSOL Multiphysics numerical simulation software was taken according to the model. A model of gas drainage model of drilling hole in coal seam was established taking a gas outburst mine as an example and resolved with numerical solution. The results show that coal seam gas pressure and coal permeability decrease gradurally with time extending, meanwhile effective radius of drilling hole increases gradually, and both have certain timeliness. The field test is taken by use of a pressure testing method with a result in accordance with the simulated one basically, which verifies correctness of the seepage-stress coupling model of coal containing gas and feasibility of calculating effective drainage radius of drilling hole by numerical simulation method.
Underground joint localization method based on electromagnetic wave and ultrasonic
LI Zongwei, LI Qiwei, WEN Liang, MENG Qingyong
2016, 42(7): 30-33. doi: 10.13272/j.issn.1671-251x.2016.07.008
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Abstract:
For low localization precision of existing underground personnel localization technologies, an underground joint localization method based on electromagnetic wave and ultrasonic was proposed by analyzing ranging principle of electromagnetic wave and ultrasonic wave as well as application characteristics in underground tunnels. In the method, a ratio of distance between a mobile node and two anchor nodes is obtained by approximate calculation according to logarithmic normal distribution model. Vertical coordinate of the mobile node is obtained by electromagnetic wave ranging method, and horizontal coordinate is gotten by ultrasonic wave ranging method. The Matlab simulation result verifies feasibility and localization precision of the method.
Spectrum analysis of partial failure of shearer rocker gear based on vibration model
DUAN Jiaolong, XU Chunyu, SONG Jiancheng, TIAN Muqin, GUO Jun, YAN Zhengkai, GUAN Qiang
2016, 42(7): 34-39. doi: 10.13272/j.issn.1671-251x.2016.07.009
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Abstract:
A partial failure vibration signal model of spur gear was established starting from gear drive mechanism and considering both amplitude modulation and frequency modulation effects of meshing vibration due to partial spur gear damage. Based on partial failure model of spur gear, structure feature of planetary gear and vibration signal generation and changing rule were analyzed, and partial failure vibration signal model of planetary gear was established. Load test of rocker arm with different gear partial failures and spectrum analysis of collected vibration signal were conducted, the results show that the model of gear fault vibration signal model can objectively and accurately reflect failure state of rocker gear, and using the method of spectrum analysis can achieve partial failure diagnosis of rocker gear.
Simulation research on control system of CST for scraper conveyor
WANG Yabin, LIAN Zisheng, CUI Hongwei
2016, 42(7): 39-43. doi: 10.13272/j.issn.1671-251x.2016.07.010
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Abstract:
Start characteristics and electro-hydraulic servo control characteristics of CST for scraper conveyor were analyzed, compositions and working principles of both CST and its control system were introduced. Based on AMESim software, simulation model that includes motor model, CST model, scraper conveyor model, two levels negative feedback PID closed-loop control system model of rotational speed and pressure were established. Two kinds of start working conditions of the scraper conveyor were simulated, including normal soft start condition and load mutation condition during smooth running stage. The simulation results indicate that the PID modified electro-hydraulic servo closed-loop control system can satisfy requirements of soft start functions and dynamic performances of scraper conveyor.
Application of GA-BP neural network in boost pressure forecast of anti-jamming valve used in rock drilling
MA Wei, MA Fei, GUO Rong, GENG Xiaoguang
2016, 42(7): 44-50. doi: 10.13272/j.issn.1671-251x.2016.07.011
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Abstract:
Structure and working principle of anti-jamming valve on a drilling rig was analyzed, and BP neural network model of anti-jamming valve was established using original data of a quarry. The theory of genetic algorithm was utilized to optimize and analyze BP neural model, and the GA-BP model was established. The analysis results show that both BP neural network and GA-BP network model can be used to predict boost pressure of anti-jamming valve, and the GA-BP network model has higher prediction accuracy, nonlinear mapping and network performance.
Fault diagnosis of mine hoist based on optimizing fuzzy Petri networks
GONG Maofa, LIU Yanni, WANG Laihe, ZHANG Chao, HOU Linyua
2016, 42(7): 50-53. doi: 10.13272/j.issn.1671-251x.2016.07.012
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Abstract:
In order to improve accuracy of fault diagnosis of mine hoist, a new fault diagnosis method of mine hoist based on optimizing fuzzy Petri networks was proposed. Firstly, momentum BP network was used to optimize weights, thresholds and reliability parameters of the fuzzy Petri networks, and then the optimal fuzzy Petri networks model was used for fault diagnosis of mine hoist. The test results show that the method has fast convergence rate of parameter and high accuracy of fault diagnosis of mine hoist, which has a certain practical value.
Adjustment of fisheye distortion images of coal mine
WANG Yong, ZHAO Kai, CHENG Deqiang, KOU Qiqi
2016, 42(7): 54-58. doi: 10.13272/j.issn.1671-251x.2016.07.013
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Abstract:
For distortion problem of fisheye images collected by video monitoring system of coal mine, an automatic obtaining method of adjustment parameters was put forward based on image content according to line constrain of ideal spherical perspective projection model. The method detects image edge characteristic lines by preprocessing the fisheye distortion image using math morphologic and random Hough transform, then gets the optimal adjustment parameters through the statistic of horizontal and vertical lines proportion. In order to decrease effect of large image information on adjustment parameter obtaining, the ideal spherical perspective projection model was improved and an improved adjustment method of fisheye distortion images was proposed, which realized center transfer of the fisheye distortion image and magnifying of part regions. The experimental results show the method can get a better adjustment effect of fisheye distortion image.
Design of signal source based on FPGA
FU Yang
2016, 42(7): 59-62. doi: 10.13272/j.issn.1671-251x.2016.07.014
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Abstract:
In order to solve problems of low precision and small frequency range of analog signal sources and unability to satisfy system requirement of bespoke direct digital frequency synthesis signal sources on aspects of control mode and frequency setting, a signal source based on FPGA was designed. The source is based on direct digital frequency synthesis principle, it adopts modularization design of FPGA and can output sine wave, square wave and triangular wave with adjustable frequency, phase and amplitude. The experimental results show that the signal has perfect quality of output wave, high frequency resolution and convenient control.
Discussion on situation and development countermeasures of coal enterprise informatization constructio
TAN Zhanglu, CHEN Xiao
2016, 42(7): 63-65. doi: 10.13272/j.issn.1671-251x.2016.07.015
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Abstract:
According to present status of coal mine informatization construction in China，the paper analyzed existing problems in coal enterprises informatization construction, such as lack of top-level planning, lagging of standards of coal mine informatization construction, lack of intelligent software effectively using coal mine big data and so on, and provided relevant countermeasures, so as to improve level of coal mine enterprise informatization construction, and realize march from digital mine and intelligent mine to smart mine.
Prediction of water inflow of a coal mine of Shaanxi
ZHANG Yaowen, LI Haijun, ZHANG Lili, KONG Huimi
2016, 42(7): 66-69. doi: 10.13272/j.issn.1671-251x.2016.07.016
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Main factors and indicators that affect water inflow of a coal mine of Shaanxi were analyzed according to its hydrogeological conditions. BP neural network and large-well method were used to predict water inflow of different working faces of the second and third districts, and results of the two methods were compared. The analysis results show that the predict result of BP neural network model is more accurate, it can be used as basis for development of mine drainage and pressure decreasing program.
Methods of increasing amount of pressure-relief gas of protective layer
LYU Longhui, JIN Hongxia
2016, 42(7): 70-72. doi: 10.13272/j.issn.1671-251x.2016.07.017
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According to gas radial flow theory and energy conservation law, gas drainage model and flow network using surface drilling were established, and method of increasing amount of pressure-relief gas of protective layer by increasing resistance of the bottom of the wellbore was proposed. The engineering application results show that by increasing the flow resistance of the bottom of the wellbore, the amount of pressure-relief gas of protective layer can be significantly increased.
Design of occupational health management system of coal enterprises
LIU Jianqing
2016, 42(7): 73-75. doi: 10.13272/j.issn.1671-251x.2016.07.018
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The paper analyzed present situation and existing problems of occupational health management of coal enterprises, put forward design scheme of occupational health management system of coal enterprises based on informatization technology. It also introduced design and implementation of system's function module in detail. The system adopts B/S structure, and uses computer platform and mobile platform to brow related information and process business. The system can effectively solve problems of low work efficiency and statistics data deviation of occupational health management of enterprise, and provide an effective mean for occupational health management.
Design of pressure monitoring system of hydraulic support based on bluetooth Ad-Hoc networks
TANG Mingzhu, ZHONG Weisheng
2016, 42(7): 76-79. doi: 10.13272/j.issn.1671-251x.2016.07.019
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To solve problems of complex wiring, unstable data transmission and difficult maintenance of existing hydraulic support monitoring system in coal mine underground, a pressure monitoring system of hydraulic support based on Ad-Hoc networks was designed. The system can solve complex wiring problem via bluetooth technology to form a wireless Ad-Hoc networks, and adopts bluetooth wireless communication and Ethernet to transmit hydraulic support pressure data with fast transmission rate and stable performance. Staff can real-timely analyze hydraulic support pressure value by use of PC software.
Design of electrical system for exploration robot
ZHAI Guodong, SU Yixin, GAO Peiyua
2016, 42(7): 79-82. doi: 10.13272/j.issn.1671-251x.2016.07.020
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In order to improve intelligence of exploration robot, an electrical system taking ARM architecture as core was designed. The system adopts techniques including 2.4 GHz wireless communication, closed-loop control of motors, control of multi degree of freedom mechanical arm and multi sensor information fusion to achieve functions of obstacle avoidance, obstacle crossing, positioning, communication and sensor measurement. It uses photovoltaic effect and improved hill climbing method to realize maximum power point tracking, and solves energy consumption problem of exploration robot.

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