工矿自动化

Research of mine wireless broadband transmission technology

SUN Ji-ping

2013, 39(2): 1-5.

<Abstract>(38) <PDF>(8)

Abstract:
The paper put forward that mine wireless broadband transmission technology is a key technology to meet with requirements of mobile monitoring, video and voice communication on cutting face, and proposed that mine wireless broadband transmission should meet with requirements of wide transmission bandwidth, easy to access wired broadband network, a small quantity of repeater equipments, small volume, low transmission power, good electromagnetic compatibility and safety, standardization of transmission protocol, strong adaptability of fluctuation of power voltage. It presented that leakage communication cannot be used as mine wireless broadband transmission, but as underground local communication; induction communication cannot be used as mine wireless broadband transmission, but as underground rescue communication; through-the-earth communication cannot be used as mine wireless broadband transmission, but as emergency communication of underground refuge chamber; PHS, CDMA, GSM and Bluetooth cannot be used as mine wireless broadband transmission; RFID cannot be used as mine wireless broadband transmission, but as coal mine Internet of Things, mine-used equipment management and anti-collision; ZigBee cannot be used as mine wireless broadband transmission, but as wireless transmission for mine-used sensor and precision location for moving targets such as underground personnel, rubber-tyred vehicle and electric locomotive; UWB cannot be used as mine wireless broadband transmission, but as underground life detection, anti-collision and precision location for underground moving targets such as personnel and rubber-tyred vehicle; 3G such as WCDMA, CDMA2000 and TD-SCDMA cannot be used as mine wireless broadband transmission, but as underground voice mobile communication. It proposed that mine wireless broadband transmission technology should use WiFi and 4G would become future mine wireless broadband transmission technology.

Load identification method of roadheader based on vibration acceleration signal and stress signal

LI Zhen, JIA Hong-gang, FAN Xu-feng

2013, 39(2): 6-9.

<Abstract>(67) <PDF>(4)

Abstract:
In view of problem that it is difficult to get dynamic load of working face equipments in coal mine underground, the paper proposed a load identification method of roadheader based on vibration acceleration signal and stress signal, introduced basic principle and implementing steps of the method. It took false rock wall cutting by EBZ260 roadheader on the ground as experiment object, selected data within 11 s from cutting to stopping of the roadheader to make analysis which can get corresponding relation between average energy of vibration acceleration and average stress, then used the least square method to get fitting curve between average energy of vibration acceleration and average stress, so as to get function expression between average energy of vibration acceleration and average stress through the fitting curve. The method provides a new way for indirect measurement of dynamic load of roadheader through vibration acceleration.

Design of a new type of safety and protection system of explosion-proof diesel locomotive

ZHOU Xu

2013, 39(2): 9-11.

<Abstract>(31) <PDF>(5)

Abstract:
In view of problem that it is difficult to add monitored points and output control points with centralized control mode in traditional safety and protection system of explosion-proof diesel locomotive, a new type of safety and protection system of explosion-proof diesel locomotive based on CAN bus and distributed control mode was designed. In the system, intelligent monitoring unit, display, relay control box, bus signal converter and switch signal collection unit are compose of distributed network topology through CAN bus to real-timely monitor each state in running process of the locomotive and input signal by driver, real-timely display certain parameters and make relative control on output of relay according to monitored state and logic relation drafted in advance, so as to ensure safe and stable running of the locomotive. The result of underground industrial test showed that the system meets with design requirement of mine vehicle with reliable electrical performance and low fault rate.

Design of electric control system of stereo dispatching and location of mine car

LI Shou-jun, MA Xiao-ping, YU Hong, QIU Yi-zhen

2013, 39(2): 12-15.

<Abstract>(103) <PDF>(4)

Abstract:
There are numerous mine cars in types in large-scale coal mines and exists problem how to full use space of input/output warehouse of mine car. The paper proposed a design scheme of electric control system of stereo dispatching and location of mine car, gave planning of stereo dispatching and location of input/output warehouse of mine car based on lead screw drive mode, and introduced electric control configuration of motion controller SIMATIC CU320, configuration of PLC unit and local detection unit and configuration of network combining with framework of the system. The debugging result showed that the system realizes stable and accurate dispatching and location of mine car and improves utilization of parking stall.

Design of monitoring system of coal moisture control of vertical composite-bed

HUANG He-song, ZHOU Qiang, WANG Zhen-lin, WANG Ning

2013, 39(2): 16-19.

<Abstract>(33) <PDF>(4)

Abstract:
In view of problem that moisture control process of coal moisture equipment of vertical composite-bed needs real-time monitoring and control, a monitoring system of coal moisture control of vertical composite-bed was designed. Functions and three-layer network structure of the system were given according to process and characteristics of coal moisture equipment, design of hardware and monitoring picture of upper-computer of the system were introduced in details. The actual application showed that the system ensures stable and safe running of coal moisture equipment and provides intuitive monitoring mode for field personnel.

Design of a new type of pre-charge circuit of single-quadrant frequency converter

TANG Bai-shan, HUANG Cui-bai

2013, 39(2): 20-22.

<Abstract>(36) <PDF>(7)

Abstract:
In view of problems of complex structure and control, high cost and big volume of contactor and charging resistance existed in traditional pre-charge circuit of single-quadrant frequency converter, a new type of pre-charge circuit of single-quadrant frequency converter was designed. The circuit uses three-phase half control rectifier bridge to replace diode rectifier bridge of traditional pre-charge circuit of single-quadrant frequency converter and takes off contactor and charging resistance. When the frequency converter starts, trigger angle of the three-phase half control rectifier bridge decreases rhythmically from 120° to 0°through synchronization circuit and single-chip microcomputer control circuit, so as to make charging current of capacitance in allowable range. The test result showed that the circuit has simple structure, reliable performance and flexible control.

Development of enterprise Web application based on Struts2 and Ajax

GAN Wen-li, LIU Wei-chao

2013, 39(2): 23-26.

<Abstract>(38) <PDF>(3)

Abstract:
In view of problems of low data transmission efficiency and response speed and bad user experience between client and server in traditional development of enterprise Web application, the paper proposed a development scheme of enterprise Web application based on Struts2+jQuery Ajax, and the scheme was applied to development of small and medium-scaled coal enterprise customer relationship management system. It introduced whole framework and implementation of main function modules of the system in details. The actual application showed that the scheme of Struts2+jQuery Ajax can effectively improve development efficiency and maintainability and scalability of customer relationship management system, and greatly improves response speed of Web application program and effect of user experience.

Development of coal mine automatio

ZHANG She

2013, 39(2): 27-33.

<Abstract>(53) <PDF>(9)

Abstract:
The paper analyzed development process of coal mine automation from single machine automation, integrated automation, mine Internet of Things to mine CPS, indicated that coal mine automation is a process of gradually realizing fusion of information system and mine physical system, and single machine automation, integrated automation, mine Internet of Things and mine CPS are features at different periods in the process. It analyzed problems of integrated automation and mine Internet of Things in actual application of coal mine, namely integrated automation and mine Internet of Things do not consider confidence of information and event, not use mechanism of issue and subscription, not consider uncertain factors in physical world, not take person and his behaviors as factors of coal mine automation system, and indicated that mine CPS is inevitable trend of development of coal mine automation which can make fusion of information system and mine physical system closely.

Research status and development of control technology for mine hoist

SU Chang-sheng

2013, 39(2): 33-38.

<Abstract>(51) <PDF>(5)

Abstract:
The paper analyzed status and development process of DC and AC mine hoist control system at home and abroad. It emphatically introduced application of three frequency-conversion speed-regulation systems based on double three-level topology in control system of mine hoist, namely high-voltage frequency-conversion speed-regulation system at stator side, double three-level frequency-conversion speed-regulation system of synchronous motor and AC-DC-AC voltage type SVPWM frequency-conversion speed-regulation system with double three-level. And it indicated that AC-DC-AC voltage type frequency-conversion speed-regulation system has better energy-saving effect and is most suitable for control system of mine hoist.

Research of properties of spontaneous combustion "three zones" in goaf based on fuzzy clustering analysis

CHENG Wen-dong, MAI Qiao-li, WU Xue-song

2013, 39(2): 39-42.

<Abstract>(38) <PDF>(4)

Abstract:
In view of problem of differences in tendency of coal spontaneous combustion at different regions in goaf, data of measured points were classified by using division method of spontaneous combustion "three zones" in goaf based on fuzzy clustering analysis and differences of each classification under different λ-intercept matrix were analyzed. Analysis results showed that the data can be divided into different categories by different values of λ; in a certain range, original categories will be divided into smaller subclasses with increasing of value of λ; when value of λ increases, data of measured points in areas close to working face can be divided into smaller subclasses more easily and data of measured points in areas far from working face are stable, so environmental properties in goaf far from working face are relatively stable and forepart changes greatly; the categories to optimal λ calculated by F-statistics uniform with division of "three zones" in goaf.

State of charge estimation of battery in mine-used movable lifesaving cabin based on extended Kalman filtering method

WANG Sha-sha, LOU Gao-feng, TANG Xia, SHI Li-ping, ZHANG En-feng

2013, 39(2): 43-47.

<Abstract>(53) <PDF>(2)

Abstract:
In view of problem of low precision in SOC estimation of battery in mine-used movable lifesaving cabin based on ampere hour method under condition of higher fluctuation of environment temperature or discharge current, the paper proposed a SOC estimation method of battery in mine-used movable lifesaving cabin based on extended Kalman filtering method. The method is basis on ampere hour method, takes factors of environment temperature and discharge current influencing estimation of SOC of battery as noises of battery system and uses optimal estimation recursive algorithm of extended Kalman filtering method to make real-time filtering and estimation for SOC of battery, which can improve estimation precision of SOC of battery. The experiment result showed that estimation result of SOC of battery used by the method is consistent with measured values and the method can applied to battery management system of mine-used movable lifesaving cabin.

Research of output characteristic fitting of eddy-current sensor based on radial-basis function neural network

YOU Wen-jian, LIANG Bing, LI Yin-jun

2013, 39(2): 47-50.

<Abstract>(42) <PDF>(2)

Abstract:
In view of problem that eddy-current sensor cannot reflect measured physical quantity accurately caused by higher nonlinear of output characteristic parameter, the paper proposed a scheme of using RBF neural network to fit output characteristic parameter of eddy-current sensor. The scheme uses newrb function to create RBF neural network, and takes measured physical quantity as input matrix and output of eddy-current sensor as output matrix to train the RBF neural network, so as to obtain low root-mean-square error and smooth output characteristic fitting curve of eddy-current sensor. The simulation result showed that RBF neural network can effectively realize fitting of output characteristic of eddy-current sensor by selecting proper creating function and expanding coefficient.

Application of BP neural network method based on genetic optimization in methane detectio

LI Mao-dong, LIANG Yong-zhi, JIA Wen-pei, XIA Lu-yi

2013, 39(2): 51-53.

<Abstract>(49) <PDF>(2)

Abstract:
In view of problems of big error and complex calculation with the least square method and problems of slow network learning speed and being easy to fall into local minimum with traditional BP neural network method when fitting output characteristic curve of infrared sensor, the paper analyzed fitting effect of improved the least square method and improved BP neural network method based on genetic optimization, indicated the improved BP neural network has higher fitting degree and gave experiment result of the improved BP neural network method in detection of methane volume fraction. The result showed that the method can fit ideal curve which improves detection precision and respond speed of infrared sensor.

A header compression technology of 6LoWPAN of Internet of Things based on cluster strategy

HUANG You-rui, QU Li-guo, SHI Ming

2013, 39(2): 54-57.

<Abstract>(61) <PDF>(2)

Abstract:
In view of problems of very limited function of LoWPAN_HC1 and LoWPAN_HC2 for global address and multicast address, and nondirectional broadcast communication and redundant network communication consumption of LoWPAN_IPHC in header compression technology of 6LoWPAN of Internet of Things, the paper proposed a header compression method of 6LoWPAN of Internet of Things based on cluster strategy, namely LoWPAN_CIPHC. The method uses cluster strategy to refine destination address and source address of header compression, which not only can make the best communication path of internal network, but also control broadcast area easily. The test result showed that LoWPAN_CIPHC can reduce network communication consumption without adding calculation comparing with LoWPAN_IPHC.

Research of the optimal excitation control technology for synchronous generator based on AC tracking

AN Qiao-jing, ZHU Chang-qing, GU Zhi-feng, LIU Feng, ZHAO Yuan-ping

2013, 39(2): 58-62.

<Abstract>(68) <PDF>(2)

Abstract:
In view of problem that traditional PID control for synchronous generator cannot meet with requirements of oscillation suppression and improvement of dynamic stability limit of power system, the paper proposed the optimal excitation control method for synchronous generator based on AC tracking. It gave deviation and linearization model of excitation system of synchronous generator based on Lagrange method, analyzed definition method of the optimal excitation control quantity and built simulation model of synchronous generator system based on the control method. The simulation result showed that the control method can real-timely control excitation system of synchronous generator to ensure output stability of synchronous generator comparing with traditional PID control method.

Intrusion detection method based on Bayesian and decision tree

CHI Jing, YANG Zhen-yu, ZHANG Ting

2013, 39(2): 62-65.

<Abstract>(39) <PDF>(2)

Abstract:
In view of problems of low detection rate and high false detection rate in intrusion detection method based on Bayesian or decision tree, the paper proposed an intrusion detection method based on Bayesian and decision tree. Firstly, Naive Bayesian method based on feature similarity is used to classify samples of training set and class value of each sample is updated. Then the samples are classified with Naive Bayesian method again. Those classes which contain misclassified samples are divided into some subclasses by using the attributes which were determined by information gain of decision tree, and the subclasses are operated on classification and partition. Finally, the model of combination of Bayesian and decision tree is used for intrusion detection. The experiment result showed that the detection method has higher detection rate than the method using either Bayesian or decision tree.

Research of coal and gangue interface recognition based on Mel frequency cepstrum coefficient and genetic algorithm

HE Ai-xiang, WANG Ping-jian, WEI Guang-fen, ZHANG Shou-xiang

2013, 39(2): 66-71.

<Abstract>(54) <PDF>(2)

Abstract:
In view of problems that γ ray method is not suitable for working face with no or little radioactive elements in roof and radar detection method has little detection range and serious signal attenuation which were used in current coal and gangue interface recognition technologies, the paper proposed a coal and gangue interface recognition method based on Mel frequency cepstrum coefficient and genetic algorithm. The method uses feature difference of acoustic signal produced by dropping process of coal and gangue to recognize coal and gangue. It uses Mel frequency cepstrum coefficient to process denoised acoustic signal of coal and gangue in frequency domain to extract 32 dimensions feature parameters of the acoustic signal, uses genetic algorithm to make optimal process for the parameters to get the best parameter combination, and uses support vector machine and BP neural network to recognize the best parameters. The experiment results showed that the method can recognize falling state of coal and gangue accurately.

An edge detection algorithm for mine roadway image

ZHAO Qian, WANG Yi-ting, ZENG Zhao-hua, HOU Yuan-bin, ZHAO Su

2013, 39(2): 71-75.

<Abstract>(93) <PDF>(3)

Abstract:
In view of problem of bad edge extraction effect when traditional Canny algorithm processes fuzzy mine roadway image, the paper proposed an edge detection algorithm for mine roadway image based on wavelet transform and Canny algorithm. The algorithm firstly makes wavelet decomposition for original mine roadway image to obtain low-frequency image and high-frequency image, so as to avoid influence of fuzzy image on edge detection effect. Then it uses Canny algorithm to calculate first order differences of low-frequency image and high-frequency image to obtain gradient images of low-frequency image and high-frequency image and obtains edge images of low-frequency image and high-frequency image through calculating the maximum value of local gradient. When edge image of high-frequency image has discontinuity point, it detects eight-point neighborhood of the point in edge image of low-frequency image to find connection point to obtain complete edge detection image of mine roadway. The experiment result showed that the algorithm can detect more edge points of image with better edge connection effect comparing with traditional Canny algorithm.

A novel fault line selection method based on empirical mode decomposition and differential spectrum

ZHENG Chen, WANG Xiao-wei, LIU Ya-juan, TIAN Shu

2013, 39(2): 75-79.

<Abstract>(53) <PDF>(2)

Abstract:
The paper proposed a novel single-phase grounding fault line selection method of small current grounding system based on EMD and differential spectrum. The method uses EMD method to decompose transient zero-sequence current and extract high-frequency IMF1 component of each line, obtained differential spectrum and fluctuation value of IMF1 component of each line according to definitions of differential spectrum and fluctuation value, and found out the fault line which has the maximum fluctuation value of IMF1 component by comparing fluctuation values of IMF1 component of each line. The experiment results showed that the method has higher accuracy of line selection and is suitable for fault line selection of small current grounding system under different grounding resistances and different fault initial phase angles.

Application research of stepped controllable shunt reactor of 750 kV high-leakage inductance transformer

LIANG Fu-bo, ZHI Yong, ZHENG Wei

2013, 39(2): 80-83.

<Abstract>(71) <PDF>(3)

Abstract:
In view of problem of higher running voltage in 750 kV power transmission and transformation system of an Area, the paper proposed a design scheme of applying SCSR of high-leakage inductance transformer into the 750 kV system. It analyzed working principle of SCSR, used electromagnetic transient simulation software to build simulation model of the 750 kV system, and respectively simulated effects of inhibiting of power frequency over-voltage and secondary arc current and capacity adjustment of SCSR under normal state and fault state of the 750 kV system. The simulation results showed that SCSR can effectively reduce steady running voltage and improve stability of the 750 kV system.

Anti-interference design of RS485 bus in coal mine safety monitoring and control system

ZHAO Xiao-bing, ZHOU Xue-feng

2013, 39(2): 83-86.

<Abstract>(51) <PDF>(7)

Abstract:
In view of problem that performance of RS485 bus will be decreased by underground complex electromagnetic environment, so as to influence data transmission of coal mine safety monitoring and control system, the paper indicated that it should make anti-interference design of RS485 bus through aspects of fault insurance circuit, electrical isolation, interface protection of anti-surge over-voltage and communication software programming, and gave implementation of the anti-interference design. The actual application showed that the anti-interference design can ensure stable running of data transmission of coal mine safety monitoring and control system.

Hazards of static electricity to coal mine safety and its preventio

ZHU Qian-wei, CAO Yong-guo

2013, 39(2): 87-89.

<Abstract>(36) <PDF>(2)

Abstract:
The paper introduced generation of static electricity and its hazards to coal mine safety, and proposed measures of preventing static electricity of coal mine products, including design methods of electrostatic discharge and antistatic design of shell in design stage, detection methods of antistatic in test stage, antistatic measures in application stage. These measures have certain reference to prevent coal mine accidents caused by static electricity.

Configuration of movable lifesaving transition station of coal mine and design of its oxygen supply system

GONG Cheng

2013, 39(2): 90-92.

<Abstract>(59) <PDF>(2)

Abstract:
The paper introduced characteristics and installation location of a new type of underground emergency rescue equipment, namely movable lifesaving transition station of coal mine, gave internal configuration scheme and configuration purpose of the transition station, and introduced design methods of oxygen supply system of the transition station based on three-level oxygen supply way of pressure ventilation, compressed air and self-rescuer. The transition station effectively solves personnel safety problem during disaster accidents such as gas explosion, coal and gas outburst, fire and collapse in coal mine.

Research of function relationship between output voltage and gas volume fraction of carrier catalytic gas sensor

CHEN Kun-hua, LU Wen-ke

2013, 39(2): 92-95.

<Abstract>(73) <PDF>(3)

Abstract:
In view of problems of large nonlinear error and low accuracy of approximate linear output curve of carrier catalytic gas sensor, the paper proposed a method of using the least square method to establish function relationship between output voltage and gas volume fraction of carrier catalytic gas sensor. It took MJC4/2.9J carrier catalytic element as experimental object, combined with corresponding experimental data to get fitting curve of output voltage and gas volume fraction, the fitting curve result showed that the function relationship between output voltage and gas volume fraction of gas sensor by using the least square method has small nonlinear error and high accuracy. The function relationship was applied to design of gas detector, the actual application result showed that the gas detector has higher accuracy and stability.

Design of hook number statistics system of mine hoist based on DM642

YAN Zhan-fang, HUA Gang, LIU Pan, ZHU Ai-chu

2013, 39(2): 96-99.

<Abstract>(50) <PDF>(2)

Abstract:
In view of problems of inaccurate counting and low efficiency of traditional hook number statistics method of mine hoist, a hook number statistics system of mine hoist based on DM642 was designed. General structure of the system was given, implementation of hoist hook number statistics algorithm which integrated Sobel operator edge detection algorithm and frame difference algorithm were introduced in details. The experiment result validated real-time performance and accuracy of the system.

Frequency-conversion reform of electrical control system of belt conveyor of main shaft

CHEN Ding-zhi

2013, 39(2): 99-101.

<Abstract>(40) <PDF>(3)

Abstract:
In view of requirement of energy-saving reform of belt conveyor of main shaft of a Coal Mine, the paper proposed a frequency-conversion reform scheme of electrical control system of the belt conveyor. It introduced structure of the reformed system and control principle of ACS800 frequency converter, and analyzed existed problems in actual application of the reformed system and its corresponding solutions.

Development of integrative control device of belt conveyor

XING Hai-long

2013, 39(2): 102-103.

<Abstract>(43) <PDF>(7)

Abstract:
In view of problems of many operating procedures and high labor intensity existed in process of belt-shrinking, tensioning and belt-winding of belt conveyor, an integrative control device of belt conveyor was designed. The automatic hydraulic tensioning device completes automatic tensioning in operation process of belt conveyor and belt storage when working face moves on. The automatic hydraulic belt-winding device curls conveying belt of belt storage and moves the conveying belt out of the belt conveyor, then moves the conveying belt to ground for processing. The actual application showed that the device runs good and completes belt-shrinking and belt-winding of conveying belt successfully.

Reform of auto-stability pressure control system of parallel running of air compressor

LIU Jie, ZHU Chao, JIANG Shi-bo

2013, 39(2): 104-106.

<Abstract>(48) <PDF>(2)

Abstract:
In view of problem of non-ideal running effect after parallel reform of air compressor of a Plant, the second reform scheme of auto-stability pressure control system of parallel running of air compressor was introduced. The scheme makes series of gasholders of two air compressors, which not only increases capacity of gasholder but also ensures reliability and stability of flow and pressure of compressed air. It can preset interval time of cycle running of two air compressors, when one air compressor is in fault, the other can run automatically. It can directly control starting and stopping of the two air compressors through emergency stopping switch, starting and stopping switch of the two air compressors. The actual application showed that the air compressor unit by the second reform has stable and normal running.

Research of over-voltage of coal mine power system

XU Jian-ju

2013, 39(2): 107-111.

<Abstract>(29) <PDF>(3)

Abstract:
In view of problem that 35 kV power system of a Coal Mine often happens over-voltage at thunderstorm day, the paper analyzed causes of over-voltage, indicated that over-voltage was induced by fraction frequency resonance and the fraction frequency resonance was induced by PT and capacitance to earth of overhead line. Through analyzing parameters of resonance over-voltage of the power system, it gave corresponding reform scheme, namely replacing PT with better excitation voltammetry characteristic, adding nonlinear harmonic eliminator at neural point of high-voltage side of PT and installing intelligent resonance eliminating device with multifunction. The actual application showed that 35 kV power system has not happened resonance over-voltage with reliable running after using the reform scheme.

Design of monitoring system of power quality

ZHANG Zong-hua

2013, 39(2): 111-114.

<Abstract>(69) <PDF>(3)

Abstract:
In view of problem that power quality is influenced by factors of short circuit, open circuit, leakage and harmonics, a monitoring system of power quality with multifunction based on DSP was designed. Design of three parts of the system namely front signal collection circuit, lower computer and analyzing software of upper computer were introduced in details. The experiment result showed that the system can real-timely detect and calculate power parameters of voltage, current, power, power factor, frequency and harmonics and it has better monitoring effect.

2013 Vol. 39, No. 2

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