工矿自动化

Revision amendments of AQ 1029-2007 Use Management Specification of Coal Mine Safety Monitoring System and Testing Instrument

SUN Jiping

2016, 42(3): 1-6. doi: 10.13272/j.issn.1671-251x.2016.03.001

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Abstract:
In order to further play role of coal mine safety monitoring system in gas control, AQ 1029-2007 Use Management Specification of Coal Mine Safety Monitoring System and Testing Instrument should be amended. The main contents of proposed amendments include: adding wind direction sensor and dust sensor; mine directors in underground should carry wireless portable methane alarm detector or wireless digital methane detect and alarm head lamp with wireless transmission function; protection grade of sensor should be not less than IP65; coal and gas outburst mines should use full range or high and low concentration methane sensor; coal mine safety monitoring system should be networked, and upload real-time monitoring data to superior; the system can transmit information by cable or optical cable; backbone cable should be divided from different shaft or from different positions with some distance in a shaft into underground; safety monitoring system cannot share the same optical fiber with image monitoring system; safety monitoring equipment should be regularly adjusted and tested 1 time per month at least; adjustment period of carrier catalytic methane sensor, wireless portable methane alarm detector and wireless methane detect and alarm head lamp should be increased from 10 days to 15 days, and the sensor should be adjusted in setting location; methane electric blocking and wind power blocking function should be tested at least 1 time per 15 days, and equipment that may cause local ventilator power outage should be tested 1 time per 6 months; dual host computer hot-backup is needed, and switch time from the host to the backup host should be not more than 40 s; scheduling staff on duty should power off and order related personnel to evacuate after receiving alarm, power outage and abnormal feed information.

Ventilator remote monitoring technology of coal mine based on mobile Internet

MA Xiaoping, WU Xinzhong, REN Zihui

2016, 42(3): 7-12. doi: 10.13272/j.issn.1671-251x.2016.03.002

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Abstract:
For hidden danger caused by cold standby mode of coal mine ventilator and single bus segmentation operation mode of power supply system at present, a series of research work were introduced about switchover without blowing-out of ventilator, air door design, power safety of ventilator, redundancy of ventilator monitoring system, fault diagnosis of ventilator, etc. Application of corresponding research achievements improves safe operation level and automation degree of coal mine ventilator. Since ventilator room locates on remote places and ventilator monitoring system is easy to falling into information isolated island, a remote monitoring system of coal mine ventilator based on mobile Internet was built by use of corresponding mobile Internet technologies. Function design of mobile client of the system and program design of client and server based on Socket communication were introduced in details. The system collects data from PLC by use of GPRS-DTU module and uploads the data to server through GPRS network, which realizes remote monitoring function of ventilator anytime and anywhere through Socket communication between server and mobile client.

Design of lump coal transshipping anti-fracturing system based on PLC

GONG Deming, LIU Tonggang, XU Changsheng, ZHAO Zhiqiang

2016, 42(3): 12-15.

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Abstract:
For a problem that lump coal fractures easily because of large drop of transshipping point during lump coal transport in coal preparation plant, a lump coal transshipping anti-fracturing system based on PLC was proposed. Working principle of the system and a design scheme of PLC control system were introduced. The system detects coal level signals by use of ultrasonic level-meter，and uses PLC to control frequency converter to adjust speed of electric spin wheel according to the coal level signals for outputting lump coal slowly, so as to reduce lump coal fracturing.

Research of mico/nano methane sensing technology

DING Enjie, MA Hongyu

2016, 42(3): 16-20. doi: 10.13272/j.issn.1671-251x.2016.03.004

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Abstract:
For design requests of low power consumption, miniaturization and low cost about methane sensor because of development of mine Internet of things, a carrier catalytic combustion type methane sensor based on mico/namo meter technology was researched. Existing research status and corresponding achievements of the methane sensor were introduced in details on inspects of microheaters and low- dimensional methane sensing, and a metal oxide semiconductor methane sensor with a new metal-insulator-metal structure was introduced. The methane sensor has characteristics of low power consumption and miniaturization, which meets with development requests of mine Internet of things.

The effect of air intake flow on power and emission performances of explosion-proof diesel

ZHANG Yudong, ZHANG Cuiping, ZHANG Ruiliang, SUN Xiuquan, LI Qiangqiang, SUN Danda

2016, 42(3): 21-24. doi: 10.13272/j.issn.1671-251x.2016.03.005

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Abstract:
In order to improve working environment of underground coal miners and reduce emissions of pollutants such as NOx, CO, HC, etc., power and emission performances of a certain type of explosion-proof diesel under different air intake flow were studied according to working environment of explosion-proof diesel and emission regulations, and the appropriate air intake flow of explosion-proof diesel was determined. The test results show that reducing air intake flow will reduce power performance of explosion-proof diesel, and increase smoke slightly, but it will also reduce the emissions of NOx.

Influence of harmonic on loss and temperature rise of mine-used dry-type transformer

ZHU Jingjing, TIAN Muqin, SONG Jiancheng, WEN Minmi

2016, 42(3): 24-30. doi: 10.13272/j.issn.1671-251x.2016.03.006

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Abstract:
In order to accurately analyze influence of harmonic on loss and temperature rise of transformer, a two-dimensional model of dry-type transformer was established firstly, and leakage magnetic field and harmonic loss in the dry-type transformer were simulated. Consequently, distributions of axial and longitudinal leakage magnetic in the transformer, as well as relationship between harmonic loss and harmonic order, harmonic ratio and distortion factor of harmonic current were derived. Then fluid-structure interaction analysis of the two-dimensional temperature field and airflow field of the dry-type transformer was conducted using finite element software Fluent, and the relationships between the temperature rise and harmonic order, as well as distortion factor of harmonic current were gained. Simulation results show that the harmonic copper loss is proportional to square of harmonic current ratio, and it is also approximately proportional to square of harmonic order when the content of harmonic current ratio is certain; the harmonic iron loss is proportional to square of harmonic voltage ratio, but it decreases and gradually tends to flatten out with harmonic order increases when the harmonic voltage ratio is certain.

Design of auto-calibration system for multi-channel strain gauge

XU Lijiao, LIU Xiang, JI Xiaoju

2016, 42(3): 31-35. doi: 10.13272/j.issn.1671-251x.2016.03.007

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Abstract:
In view of problem of wasting time and energy and low efficiency in calibrating process of existing calibration method of strain gauges which adopts single-channel manual operation mode, an auto-calibration system based on cortex-M3 MCU was designed，hardware and software design of the system were introduced in details. The system can output standard resistance signal to input terminal of calibration bridge , and can automatically compute precision of calibrate bridge through comparison value between actual outputs and theoretical outputs. The experimental results show that the system can perform auto-calibration of strain gauge efficiently with calibration precision at 0.5%.

Rapid generation method of RSS fingerprint data in underground roadway

WANG Yongxing, HUA Gang, ZHANG Xin

2016, 42(3): 36-39. doi: 10.13272/j.issn.1671-251x.2016.03.008

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Abstract:
In view of problem of low efficiency of traditional sampling of RSS fingerprint data point by point in underground roadway, a rapid generation method of RSS fingerprint data based on Kriging interpolation algorithm was proposed. Firstly, theory variogram is obtained by fitting experiment variogram with RSS fingerprint data of a few observation points. Then weight coefficient of Kriging interpolation algorithm is gotten under the condition of unbiased estimation and the minimum estimation variance. Finally, RSS fingerprint data of estimation points are calculated through Kriging interpolation algorithm. The experimental result shows that the RSS fingerprint data obtained by the method are accurate and location error is low.

Regularity of three fields evolution of hydraulic fracturing process in coal seam

XU Zhaoyong, SONG Dazhao, QIU Liming, WANG Enyuan, MA Yafei, HE Junjiang

2016, 42(3): 39-43. doi: 10.13272/j.issn.1671-251x.2016.03.009

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Abstract:
Numerical simulation was conducted for hydraulic fracturing process in coal seam according to solid-liquid coupling equations and Mohr-Coulomb principle. The evolution of seepage field, stress field and fracture field (three fields) during process of crack propagation in coal seam was analyzed respectively. The results show that the three fields are changing dynamically during the process of hydraulic fracturing. The fracture is motivated to expand by pore water pressure, as a result of which, crack damage increases, seepage field centering to the fracture expands gradually, and high stress area and low stress area are developed from original stress field, and two regimes of low stress and high permeability field in a vertical direction of main fracture are ultimately formed. All of the above contribute to an effect of pressure relief and permeability improvement.

Fusion algorithm of underground personnel positioning based on self-organizing competitive network

ZHANG Jianying, ZHANG Yuehui, ZHOU Liyu

2016, 42(3): 44-47. doi: 10.13272/j.issn.1671-251x.2016.03.010

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Abstract:
In view of problem of big positioning error of underground personnel positioning method based on weighted centroid algorithm, a fusion algorithm of underground personnel positioning based on self-organizing competitive network was proposed. The algorithm uses learning screening capacity of self-organizing competitive network, and screens out actual RSSI value close to the theoretical value by group training, then finds valid coordinates for the weighted centroid algorithm, and calculates unknown node position based on weighted centroid algorithm. The Matlab simulation results show that the positioning accuracy of the algorithm is significantly higher than the original weighted centroid algorithm.

Study of wireless power transmission system of small size resonator

FAN Yingjie, ZHANG Kairu, DI Dongzhao, GU Huali, HAN Lu

2016, 42(3): 48-51. doi: 10.13272/j.issn.1671-251x.2016.03.011

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Abstract:
In view of the problem that transmission efficiency of small wireless charging devices changes with distance between transmitter and receiver, relevant factors of frequency splitting were analyzed according to mathematic model of wireless energy transmission system. Under the condition that resonant frequency and impedance parameters do not change when frequency splitting occurs, mutual inductance of two resonance coils can be reduced by adjusting radial distance of the two coils, so as to inhibiting frequency splitting phenomenon and improve transmission efficiency. Finally, experiments platform of wireless power transmission system of small size resonator was set up, and the experimental results show that the system can successfully charge the load with good transmission performance, which is suitable for small wireless energy transmission equipment.

Study of shearer positioning method using strapdown inertial navigation system

ZHANG Jinyao, LI Wei, YANG Hai, SI Zhuoyin, YING Baohua

2016, 42(3): 52-55. doi: 10.13272/j.issn.1671-251x.2016.03.012

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Abstract:
For problem that shearer on fully mechanized coal face has lower positioning accuracy, a shearer positioning method using strapdown inertial navigation system based on Rodrigues parametric method was proposed. The tri-axial accelerometer and suspended gyroscope in the SINS were used to output information of acceleration and angular velocity of the shearer, and Rodrigues parametric method with no-redundancy was applied to calculate the position and attitude data. The simulation result shows that in the process of beveling feed, the maximum positioning error is 0.291 4 m and the maximum error of attitude angle is 0.602 2 °, it meets the requirements of positioning accuracy of shearer.

Intelligent predictive control of coal moisture control system based on OSVR

MENG Yongzheng, LI Xiaobi

2016, 42(3): 55-59. doi: 10.13272/j.issn.1671-251x.2016.03.013

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Abstract:
In view of problem of the long training time and mismatch model of existing coal moisture prediction model, a prediction model of coal moisture control based on OSVR was established, an intelligent predictive control method of coal moisture control system based on OSVR was proposed. The method adopts intelligent optimization algorithm and predictive functional control to realize accurate control of export coal moisture of coal moisture control system. The simulation and experimental results show that the proposed method has better robustness and higher control precision.

Study of harmonics detection based on parametric spectral estimation method

ZHANG Tingzhong, MA Hongyu, SHI Manman, SUN Yidi

2016, 42(3): 60-64. doi: 10.13272/j.issn.1671-251x.2016.03.014

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Abstract:
Three parametric spectral estimation methods including Yule Walker, Burg and Covariance were studied and an improved Covariance method was proposed based on analysis of AR model. The four kinds of parametric spectral estimation method were used for harmonics, inter-harmonics, and sub-harmonic detection on Matlab simulation platform. The simulation results show that the parametric spectral estimation method can detect not only integer harmonics, but also has good detection effect on inter-harmonics and sub-harmonics, and Burg and improved Covariance method have the best detection effect.

Otherness feature extraction method for underground image based on Shearlet transform

HUANG Yu, ZHANG Yingjun, PAN Lihu

2016, 42(3): 64-68. doi: 10.13272/j.issn.1671-251x.2016.03.015

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Abstract:
For the problem that face images collected underground are susceptible to dust interference and most feature extraction methods are sensitive to noise, an otherness feature extraction method for underground image based on Shearlet transform was proposed. First, Shearlet transform was used for multi-directional and multi-scale image decomposition; then each directional sub-graphs with the same scale were encoded and fused, and furthermore fusion was conducted by giving different weights according to Shannon entropy of the subgraphs; finally, Shearlet inverse transform was used to reconstruct otherness image of low-frequency sub-graph and fused high-frequency sub-graph. The experimental results show that the method has a good objective and subjective evaluation.

Design of nonlinear sliding mode controller for hydraulic fracturing of coalbed methane

YAO Shuncai, MA Tiehua, LI Feng

2016, 42(3): 69-74. doi: 10.13272/j.issn.1671-251x.2016.03.016

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Abstract:
For coordination and synchronous control problem of multi motors of water pump for hydraulic fracturing in coalbed methane exploit process, a method of nonlinear sliding mode control was proposed, design method of nonlinear sliding mode controller for hydraulic fracturing of coalbed methane was given, and the controller performance was analyzed combining with hydraulic fracturing system of coalbed methane. The simulation analysis and experimental results show that concentration and single hole flow rate of coalbed methane were increased greatly in the process of coalbed methane fracturing exploit.

Power balance control method of multi-motor driving belt conveyor

XUE Yanbo

2016, 42(3): 74-77. doi: 10.13272/j.issn.1671-251x.2016.03.017

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Abstract:
In view of problem of motor power unbalance in process of starting of multi-motor driving belt conveyor which uses hydro-viscous soft starting device, a power balance control method of multi-motor driving belt conveyor was proposed. A current prediction algorithm is used to predict motor current in order to improve control response speed. According to difference between the motor predictive currents, given frequency of control pump which is connected with the hydro-viscous soft starting device is adjusted through proportional derivative control algorithm, then the motor current is changed, so difference between the motor currents can be controlled in a certain range. The field application result shows that the method can restrain excessive current of motor whether no-load or heavy-load starting of the belt conveyor, which achieves smooth start and power balance of the belt conveyor.

Design of control keyboard of shearer based on DP/LIN bus

HONG Zhengyu, TIAN Wei, LIU Jia

2016, 42(3): 78-80. doi: 10.13272/j.issn.1671-251x.2016.03.018

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Abstract:
In order to adapt to needs of development of remote control method of shearer, a control keyboard of shearer based on DP/LIN bus was designed. The keyboard collects control information via the LIN bus data acquisition module, and can transmit control information of corresponding different keyboard through the LIN bus, and convert the control information to DP bus signal, so as to exchange data with PLC, and control open/stop, lift and traction of shearer by the PLC. The control keyboard can realize remote real-time control of shearer, and improve automation level of coal mining.

Design of monitoring and communication system for the third power point of coal mine

XU Yongfeng

2016, 42(3): 81-83. doi: 10.13272/j.issn.1671-251x.2016.03.019

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Abstract:
To ensure safety and reliability of the third power point of coal mine, a monitoring and communication system for the third power point of coal mine was designed, hardware and function design of the system were introduced. The system realizes monitoring and protection function for the third power point, and improves safety and reliability of the third power point of coal mine.

Design of integrated communication system of mine emergency rescue command

ZHENG Wanbo, WU Yanqing

2016, 42(3): 84-86. doi: 10.13272/j.issn.1671-251x.2016.03.020

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Abstract:
Taking development trend of mine emergency rescue command communication system as design requirements, a design scheme of integrated communication system of mine emergency rescue command which combines with wired SHDSL, wireless WiFi and satellite communication technologies was proposed based on three-level command information transmission model. The test results show that the system meet needs of converged communication of various real-time data such as voice, video, environment monitoring parameter and personnel vital sign parameter with high transmission rate and long communication distance.

2016 Vol. 42, No. 3

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