工矿自动化

Proposal of revision for transducers setup of Coal Mine Safety Regulatio

SUN Jiping

2014, 40(5): 1-6. doi: 10.13272/j.issn.1671-251x.2014.05.001

<Abstract>(102) <PDF>(9)

Abstract:
The paper proposed that wind transducers, air velocity transducers and methane transducers in intake airway should be setup for alarm of coal (rock) and gas outburst additionally, full scale methane transducers or high-low concentration methane transducers should be equipped in coal (rock) and gas outburst mines. It proposed that methane transducers should be setup on upper corner of coal face. It put forward that methane transducers should also be installed on self-moving hydraulic support, coal plough, bolt drill carriage, continuous miner, shuttle car, and so on; dust transducers should be setup on tunneling face, and temperature transducers should be placed on forcing fan. It also proposed that electromechanical chambers are forbidden to be setup in return airway; trolley locomotives are forbidden in highly gassy mines; mine-used special type explosion-proof electric locomotive with storage battery and mine-used explosion-proof diesel locomotive are forbidden to be used in return airway of coal (rock) and gas outburst mines; vehicular methane controller or portable methane alarm detector should be installed on mine-used explosion-proof diesel locomotive. It indicated that carbon monoxide alarm concentration 0.002 4%CO is alarm concentration influencing on human health, fire alarm of worked out section should adopt indicator of change of carbon monoxide concentration.

Research of prediction and control technology of rockburst in deep and high-stress zone

TIAN Junbin, XI Baoping, LI Ning, GUO Qinghua, LI Zhiwei

2014, 40(5): 7-12. doi: 10.13272/j.issn.1671-251x.2014.05.002

<Abstract>(47) <PDF>(4)

Abstract:
Taking characteristics of rockburst of the third level transport tip in a coal mine into consideration, a conclusion was gotten that rockburst in the zone was highly-stressed medium rockburst in deep district by analyzing influence factors of rockburst from mechanical properties of rocks and precipitating factors. Electromagnetic radiation method was used to predict rockburst and rational critical indexes were determined through analyzing monitored electromagnetic radiation value. Feasibility of the method was verified by field application. Three blasting pressure-release schemes were put forward and a short-hole blasting scheme with extending the secondary hole was chosen by use of numerical simulation. Perfect rockburst prevention and control effect of the scheme was verified by field test.

Design of mine-used multi-parameter gas flow sensor

YANG Xujun, CHENG Dawei, YANG Kang

2014, 40(5): 12-14. doi: 10.13272/j.issn.1671-251x.2014.05.003

<Abstract>(52) <PDF>(5)

Abstract:
In order to solve problem that traditional gas drainage monitoring system needs many sensors, cables and has inconvenient installation and maintenance because of too many monitored parameters, the paper designed a new kind of mine-used multi-parameter gas flow sensor. The sensor can measure gas flow with flow rate between 0.3 m/s to 30 m/s in pipeline with diameter between 80 mm to 1 000 mm. The sensor only needs a mounting hole for installation, and uses a four-core cable to transfer signals of flow, temperature and pressure to transmission substation by RS485. Industrial test results show that the sensor has high range ratio, good stability and practicability, and can reduce workload of preliminary research, construction and maintenance of gas drainage monitoring system.

Leakage protection system of underground power grid based on ZigBee wireless sensor network

ZHU Yankai, LI Zhenbi, JIANG Yuanyuan, SHU Zhongfan, LU Ju

2014, 40(5): 15-17. doi: 10.13272/j.issn.1671-251x.2014.05.004

<Abstract>(47) <PDF>(4)

Abstract:
In view of shortcomings such as poor reliability, high error rate existed in current leakage protection system of underground high-voltage power grid，a design scheme of leakage protection system of underground power grid based on ZigBee wireless sensor network was put forward. The system adopts CC2530 as core and uses improved RSSI location algorithm to locate fault position，which realizes remote fault location, and reduces error rate. The test results show that performance of the system is stable, and meets requirements of leakage protection of underground power grid.

Research of underground RFID-based LANDMARC location technology

XU Huixia, BAO Jianjun, TAN Dake, LI Zhengdong

2014, 40(5): 18-21. doi: 10.13272/j.issn.1671-251x.2014.05.005

<Abstract>(70) <PDF>(7)

Abstract:
Principle of underground RFID-based LANDMARC location system was briefly introduced. For low location precision of LANDMARC location system caused by underground multi-path effect, improved schemes of the LANDMARC system were summarized form the view of accuracy of RSSI, selection of the nearest point and weight formula. Research directions of the underground RFID-based LANDMARC location system were put forward, which were system layout and central location algorithm.

Discussion on circuit design for reducing coupling degree of interference source

YAN Gangfeng, FANG Hong, YANG Wei, GUO Bing

2014, 40(5): 22-26. doi: 10.13272/j.issn.1671-251x.2014.05.006

<Abstract>(60) <PDF>(4)

Abstract:
Some main ways of interference coupling in electronic circuit design process were described and their caused factors were analyzed briefly. How to reduce interference source coupling degree in the circuit design process were discussed from aspects of producing of common impedance and suppression of its coupling interference, using measures of isolation, shielding and grounding to barrier interference coupling, and using low pass filter to reduce noise coupling.

Design and analysis of low-voltage residual current operated protective device

ZHANG Xiuhua

2014, 40(5): 27-29. doi: 10.13272/j.issn.1671-251x.2014.05.007

<Abstract>(98) <PDF>(6)

Abstract:
In view of problem that current residual current operated protective device could easily lead to serious interphase short circuit fault after single-phase leakage, the paper analyzed operating characteristics of a novel residual current operated protective device in low-voltage grid based on low-voltage three-phase residual current protection theory, and discussed general design principles of protector in low-voltage power supply system under different wiring systems. Following the design principles can control resonance parameters within a limited range, which avoids design blindness.

Detection method of belt longitudinal tear based on support vector machine and infrared image segmentation

ZHAO Bilong, QIAO Tiezhu

2014, 40(5): 30-33. doi: 10.13272/j.issn.1671-251x.2014.05.008

<Abstract>(53) <PDF>(6)

Abstract:
In view of problems of low detection precision of existing detection methods of belt longitudinal tear and difficulty to eliminate influence of coal mine complex environment, a detection method of belt longitudinal tear based on support vector machine and infrared image segmentation was proposed. Firstly, the infrared image of belt longitudinal tear is collected. Then, the infrared image is segmented by the method of support vector machine. Finally, the belt longitudinal tear or its tendency is tested accurately by calculating quantity of torn pixels. The test results show that the image segmentation time of the method is short and detection precision is high to 99.1%.

System of coal and gas outburst prediction based on improved BP neural network

WANG Sheguo, TIAN Zhimin, ZHANG Feng, WU Shasha

2014, 40(5): 34-37. doi: 10.13272/j.issn.1671-251x.2014.05.009

<Abstract>(70) <PDF>(2)

Abstract:
To overcome shortcomings of slow convergence speed and falling into local minimum easily, traditional BP neural network was improved by using VLBP algorithm based on adaptive learning rate and LMBP algorithm based on numerical optimization technique in Matlab neural network toolbox, and a system of coal and gas outburst prediction based on the improved BP neural network was designed. Both traditional BP neural network and the improved one were used to predict coal and gas outburst experimentally. The results show that the improved BP neural network can predict coal and gas outburst faster and more accurately.

Research of fault location of underground power cable based on multi-wavelet

DONG Aihua, SU Ying

2014, 40(5): 37-42. doi: 10.13272/j.issn.1671-251x.2014.05.010

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

Abstract:
In view of problem of low location precision in fault location method of underground power cable based on traditional wavelet transform caused by asymmetry of wavelet function, the paper proposed a fault location method of underground power cable based on GHM multi-wavelet. It analyzed principle of multi-wavelet theory, and introduced application of the GHM multi-wavelet in fault location of underground power cable. The simulation result shows that singular points of each scale cannot occur migration after signal of fault current of power cable is transformed by the GHM multi-wavelet, which improves precision of fault location.

Derivation detection algorithm for single-phase circuit voltage sags

LI Xinian, WANG Yanwe

2014, 40(5): 43-46. doi: 10.13272/j.issn.1671-251x.2014.05.011

<Abstract>(32) <PDF>(2)

Abstract:
In view of problem that common detection method of single-phase circuit voltage sags has huge calculated amount and its accuracy of detection result may be affected by unsynchronized signals, a derivation detection algorithm was proposed. The algorithm uses instantaneous voltage value and its derivative to construct linear equation in two unknowns, achieves real-time detection of voltage sags by solving the equation, and solves the problem of huge calculated amount and unsynchronized signals. The simulation results show that the algorithm has little calculated amount, short detection time and high precision, which can meet speedability requirements of detection.

Face recognition algorithm based on cascade sparse representation-based classifier

YANG Yu

2014, 40(5): 46-48. doi: 10.13272/j.issn.1671-251x.2014.05.012

<Abstract>(47) <PDF>(2)

Abstract:
For problem of high complexity, slow identification of algorithm based on sparse representation-based classifier, the paper proposed face recognition algorithm based on cascade sparse representation-based classifier. The algorithm uses ideas of cascade, through repeated using of sparse representation-based classifier to determine the class which the sample to be classified belongs to step by step and accurately. The algorithm reduces computational complexity and identifying difficulty, and reaches goals of high recognition rate, good robustness and fast identifying speed.

Research of speaker recognition system based on GMM-SVM

ZHAO Lihui, MAO Zhu, HUO Chunbao, YANG Hongzhe

2014, 40(5): 49-53. doi: 10.13272/j.issn.1671-251x.2014.05.013

<Abstract>(54) <PDF>(3)

Abstract:
According to the similarity of speech data of the same type and characteristic that data of different types has different geometrical distance, the paper proposed a speaker recognition system based on SVM-GMM. The system combines advantages of GMM and SVM, solves problems that GMM cannot distinguish differences between the voice data while the data is small, and recognition rate of SVM drops while handling large amounts of data. The improved K-Means algorithm is used for initialization of model parameters to improve accuracy. The experiment results show that speaker recognition system based on SVM-GMM has better recognition rate and robustness than the system using GMM or SVM alone.

Underground image denoising method based on improved simplified pulse coupled neural network

FENG Weibing, HU Junmei, CAO Genniu

2014, 40(5): 54-58. doi: 10.13272/j.issn.1671-251x.2014.05.014

<Abstract>(28) <PDF>(2)

Abstract:
In order to solve problems of traditional image denoising methods such as image blur, edge information loss and so on, an image denoising method based on improved simplified pulse coupled neural network was proposed according to characteristics of underground images including uneven luminosity and large noise. Selection of neurons joining strength β was improved, which made β depend on pixel gray value of image, so as to get better denoising effect. At the same time, selection of decay time constant αE of dynamic threshold was improved, which made αE depend on amplification coefficient vE of threshold output, so as to reduce number of parameters of simplified pulse coupled neural network model. The value of vE was selected through experiment. The experiment results show that the method removes salt and pepper noise of underground images more effectively and preserves details of image edge more completely than traditional median filtering and mean filtering.

On-line identification method of time-variable parameter of DC motor

GUO Xinjun, CHEN Suxia

2014, 40(5): 59-61. doi: 10.13272/j.issn.1671-251x.2014.05.015

<Abstract>(43) <PDF>(3)

Abstract:
In view of problem that parameters of DC motor such as armature impedance and rotor rotating momentum may change with operating environment and working conditions of the motor, resulting in control failure of the system, an on-line identification method of time-variable parameter of DC motor based on recursive least squares algorithm was given, and control system of DC motor with TMS320F2812 as the core was designed. The experiment results show that the system with the recursive least squares algorithm can achieve effective identification of time-variable parameter of DC motor system.

Optimal design of fuzzy control for distribution static synchronous compensator

TANG Yi, LI Jianhua, CHEN Jingbo

2014, 40(5): 62-66. doi: 10.13272/j.issn.1671-251x.2014.05.016

<Abstract>(25) <PDF>(2)

Abstract:
For problem that fuzzy control parameters of complex distribution static synchronous compensator is difficult to adjust, mathematical model of distribution static synchronous compensator based on direct current control and simplify FBD detection method was built, and an optimal design method of fuzzy control parameters based on chaos particle swarm algorithm was proposed on the basis of analysis of traditional fuzzy PI control principle. Results of simulation and experiment show that the optimization method can control DC voltage precisely and enhance noise immunity, meanwhile make the compensating current track the compensation current command value quickly and accurately, which improve the control effect significantly.

Research of inverter based on compound control strategy

YAN Wenyu, YU Shaojua

2014, 40(5): 67-70. doi: 10.13272/j.issn.1671-251x.2014.05.017

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

Abstract:
In view of problems of bad reliability and robustness existed in single-phase full-bridge inverter based on single control, the paper proposed a compound control strategy based on iterative learning control and fuzzy PI control. The fuzzy PI control is used to improve dynamic characteristics of the inverter, and the iterative learning control is used to improve steady precision of the inverter. The simulation result shows that waveform of output voltage of the inverter based on compound control strategy has low distortion rate, fast dynamic response and high steady precision.

Research of control strategy of modular multilevel rectifier

LI Shuai, YU Shaojuan, SU Bonan, YANG Wei

2014, 40(5): 71-76. doi: 10.13272/j.issn.1671-251x.2014.05.018

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

Abstract:
In view of problem that capacitor voltage balance control strategy of common modular multilevel converter has a large fluctuation of capacitance voltage, a composite capacitor voltage control strategy was proposed on the basis of analysis of mechanism of influence of changing capacitance value of sub-modules on its capacitor voltage. The strategy combines control strategy of modifying modulation wave with control strategy of changing capacitance value of sub-modules, so as to control balance of the capacitor voltage. It uses CPS-SPWM to modulate modular multilevel converter, adopts accurate feedback linearization to decouple input active and reactive current of PWM rectifier, so as to control rectifier power factor and DC voltage after rectification. The Matlab simulation results show that the control strategy effectively reduces fluctuations of capacitance voltage and reaches prospective effect.

Research of cloud computing model of mine gas forecast and early warning

BAI Yongming, ZHANG Jie

2014, 40(5): 76-80. doi: 10.13272/j.issn.1671-251x.2014.05.019

<Abstract>(24) <PDF>(4)

Abstract:
The paper researched application model of cloud computing of mine gas forecast and early warning based on basic principle of cloud computing, and introduced basic structure, computational analysis model and analysis process of early warning of cloud computing model. The application examples show that the cloud computing model is feasible to apply in forecast and early warning of mine gas.

Design of digital intelligent rope guider

LI Xiaoqing, YU Miao, SHEN Zuying, CHEN Xuedong, ZENG Lizhan

2014, 40(5): 81-84. doi: 10.13272/j.issn.1671-251x.2014.05.020

<Abstract>(54) <PDF>(5)

Abstract:
For problem that traditional rope guider applied in small hoist of coal mining could not realize long time consecutive and orderly steel rope aligning and is easy to cause rope wear or even broken, a new type of digital intelligent rope guider was designed. Designs of basic structure, working principle and important components were expounded, and implementation of PID control and feed forward control algorithm were analyzed. The rope guider adopts intelligent digital control technology to realize real-time accurate following, accurate and timely automatic reversing, and real-time error compensation. Application examples in small hoist of coal mining demonstrate the intelligent digital rope guider has good effect.

Design of automatic frequency-conversion control system of fireproof and extinguishing by even air pressure

WU Fusheng, HUANG Linhua, HE Min, JIANG Dezhi

2014, 40(5): 84-87. doi: 10.13272/j.issn.1671-251x.2014.05.021

<Abstract>(26) <PDF>(4)

Abstract:
In view of problem of big power consumption, low degree of automation, low accuracy and real-time performance existed in traditional and artificial control method of fireproof and extinguishing by even air pressure, an automatic frequency-conversion control system of fireproof and extinguishing by even air pressure was designed, and composition, operation mode， control method and logic implementation process of the system were introduced. The system adopts theory of local dynamic air pressure balance of multilayer goaf flow field, uses method of automatic frequency-conversion to control local ventilator to change pressure of working face according to differential pressure of working face and upper adjacent goaf, so as to reach the purpose of pressure equalizing of working face and ambient, which realizes automatic control of fireproof and extinguishing by even air pressure of interconnected mining working faces of multilayer goaf.

Design and application of high pressure spraying device for falling dust of heading machine

ZHAO Yan, CUI Wenxiang

2014, 40(5): 88-90. doi: 10.13272/j.issn.1671-251x.2014.05.022

<Abstract>(36) <PDF>(4)

Abstract:
For problem of bad effect of falling dust because of insufficient pressure of water spraying system outside heading machine fuselage, a high pressure spraying device for falling dust of heading machine was designed. The device mixes high pressure airflow with waterflow to inject water mist particle with good atomization effect and large covering area at a high speed, and can greatly reduce the dust concentration on working face. The practical application shows that the effect of falling dust of the device is remarkable, and total dusting efficiency is above 80% in inlet and return airflow at ten meters away from tunneling working face.

Design of integrated monitoring and control system of underground slope roadway transportatio

WANG Guobao

2014, 40(5): 90-93. doi: 10.13272/j.issn.1671-251x.2014.05.023

<Abstract>(43) <PDF>(3)

Abstract:
In order to improve safety of underground slope roadway transportation, an integrated monitoring and control system of underground slope roadway transportation was designed, and main device and its working principle of the system, application functions of the system in underground slope roadway transportation were introduced in details. The system adopts technologies of double-beam infrared monitoring, broadcasting of sound and light alarm along the lope roadway and computer network communication, realizes functions of monitoring and alarm of slope roadway transport system and hoist locking through collecting data of the pedestrians and tramcar, so as to achieve purpose of "drive not people, pedestrians not drive". The practical application results show that performance of the system is stable, operation is safe and reliable.

Realization of graded power-off in coal mine safety monitoring and control system

HE Qingsong

2014, 40(5): 94-96. doi: 10.13272/j.issn.1671-251x.2014.05.024

<Abstract>(43) <PDF>(2)

Abstract:
Necessity of graded power-off was analyzed when gas overran on fully-mechanized mining face. Design scheme of graded power-off module in software of central station of coal mine safety monitoring and control system was introduced as well as graded power-off function of monitoring substation. The graded power-off function can cut off power supply for device with higher power-off priority when volume fraction of gas achieves set value, so as to reduce gas accidents and startup with load of belt conveyer. But the function cannot be realized when wire of gas sensor is cut off and makes adjustment of gas sensor more complicated.

Keys of electro-hydraulic control of support used for coal plough unit

WU Qing, LI Yong, GONG Fuzhang

2014, 40(5): 97-99. doi: 10.13272/j.issn.1671-251x.2014.05.025

<Abstract>(36) <PDF>(3)

Abstract:
Structure of electro-hydraulic control system of support used for coal plough unit was introduced and keys of electro-hydraulic control of support as well as solutions were focused on including precision of support pushing, support quick-moving and optimal arrangement of tip-to-face distance. Application shows that the electro-hydraulic control system of support used for coal plough unit can precisely control automatic pushing-step of support with moving-forward time of 8 s, and there is no top off or rib spalling.

Research of management system of spot inspection of coal mine equipments

CAO Xiangang, ZHANG Huaizhu, HUI Yang

2014, 40(5): 100-103. doi: 10.13272/j.issn.1671-251x.2014.05.026

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

Abstract:
The paper described four stages of PDCA cycle, gave PDCA cycle model of management system of spot inspection of coal mine equipments and specific work of the four stages, and analyzed system architecture, functional modules and spot inspection process. The system standardizes management process of equipment maintenance, achieves recording and storage of status data and maintenance information of equipments, and improves working efficiency of equipment maintenance.

Design of wireless video monitoring terminal of water source wells in coal mine

WANG Shuqi, LI Yahua, LI Zihe

2014, 40(5): 103-105. doi: 10.13272/j.issn.1671-251x.2014.05.027

<Abstract>(42) <PDF>(3)

Abstract:
For problem that existing monitoring system of water source wells in coal mine cannot monitor video information surrounding water wells limited by data transmission rate of radio or GPRS, the paper proposed a design scheme of wireless video monitoring terminal of water source wells. The monitoring terminal adds the part of real-time video monitoring, optimizes H.264 compression module, and uses TD-SCDMA wireless broadband of 3G network for transmission of video streams. The test results show that the monitoring terminal can meet the needs of capture and transmission of video information, and realizes multi-function monitoring of water source wells.

Development of mine-used signal conditioning device of vibration acceleration sensor

JI Xiaodong, XUE Guanghui, YANG Jianjian, WU Miao

2014, 40(5): 106-108. doi: 10.13272/j.issn.1671-251x.2014.05.028

<Abstract>(28) <PDF>(5)

Abstract:
In view of problem that vibration signal of underground large equipments is difficult to be collected, a mine-used signal conditioning device of vibration acceleration sensor was designed. It introduced selection design of vibration acceleration sensor, design of power module, exciting circuit and filtering circuit of conditioning board of vibration signal and protection design of the device. The test result validates reliability and practicality of the device.

Design of management system for ventilation security instrument

HAN Shu, HU Yu, LI Tong, LIU Xiang, ZHANG Yan, WANG Zeling

2014, 40(5): 109-112. doi: 10.13272/j.issn.1671-251x.2014.05.029

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

Abstract:
In view of problem of incomplete instrument record and lack of maintenance system, a management system for ventilation security instrument was designed. The overall system design, hardware design of collection node and software design of server management were introduced by taking self-rescuer management as an example. The system realizes effective management of ventilation security instrument and consuming staff, which electronizes paper information, systematizes record information and makes equipment maintenance method more reasonable. Meanwhile, it achieves seamless connection among procurement, storage and use of ventilation security instrument.

Constitute of cost items of coal enterprise and accounting of its special business

NIU Zhendong, HAO Suli

2014, 40(5): 112-115. doi: 10.13272/j.issn.1671-251x.2014.05.030

<Abstract>(30) <PDF>(2)

Abstract:
The paper briefly introduced objects of cost accounting of coal products, and discussed constitute of cost items of coal products from costs of raw coal resource, production, safety, environmental governance and compensation, coal washing and blending and transforming development. It also analyzed accounting measure of special business of costs of coal products, including accounting of price of coal resources, production maintenance fee and safety fund fee.

2014 Vol. 40, No. 5

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