工矿自动化

Measurement and analysis of underground electromagnetic interference of medium and low frequency band

ZOU Zhe-qiang, ZHUANG Jie, QU Shi-jia

2013, 39(5): 1-5.

<Abstract>(20) <PDF>(6)

Abstract:
In view of problem that underground monitoring devices are mainly influenced by electromagnetic interferences of medium and low frequency band, main electromagnetic interferences of medium and low frequency band of coal mine underground, namely surge interference of underground power cable, interference of power frequency converter, interference of grounded grid, radiated interference of motor and electrical devices, interference of trolley locomotive and interference of leakage communication system, were measured and analyzed with oscilloscope and spectrum analyzer. The analysis results show that the surge interference of power cable, interference of power frequency converter and radiated interference of motor and electrical devices are bigger than the others, the next are the interferences of grounded grid and trolley locomotive, and the one after the next are the interference of leakage communication system and the power interference of power cable.

Design of basic GIS system of digital mine

TIAN Bing, GUO Fan, DENG Fei, ZHAO Guang-xu

2013, 39(5): 5-8.

<Abstract>(64) <PDF>(8)

Abstract:
In view of visual application requirements of professional subsystems of digital mine such as underground personnel location and attendance system, safety monitoring and control system, ventilation information management system, underground equipments management system and monitoring and management system of water supply and drainage, a basic GIS system of digital mine was designed. The system takes measured geographic data as basis to generate ground objects distribution map of mine and can provide basic GIS function service, so as to realize management and analysis function for professional subsystems.

Design of standby power supply system of flameproof electrical equipments based on Ni-MH battery

YOU Qing-shan

2013, 39(5): 9-12.

<Abstract>(53) <PDF>(8)

Abstract:
In view of requirement in GB 3836.2－2010 standard that it must use Ni-Cd battery, lithium battery and Ni-MH battery as standby battery in standby power supply system of mine flameproof electrical equipments, a standby power supply system of flameproof electrical equipments based on Ni-MH battery was designed. Working principle of Ni-MH battery and design requirements of the system were analyzed, design of charging management unit and protection unit of the system were introduced in details, and test result of the system was given. The actual application shows that the system can meet requirement of GB 3836.2－2010 standard with stable running, safe and effective protecting measures.

Research of control architecture of mine-used rescue robot

LIU Jian, ZHU Hua

2013, 39(5): 12-15.

<Abstract>(72) <PDF>(4)

Abstract:
The paper discussed working environment of mine-used rescue robot and performance requirements of its control architecture, introduced control architectures of existing mine-used rescue robot including closed control architecture based on industrial control computer, distributed control architectures based on PLC, industrial control computer and embedded system, and analyzed their advantages and disadvantages. It proposed a distributed control architecture based on embedded system and CAN bus, which is more adaptive to complicated environment in coal mine underground than the existing architectures and is especially suitable for disaster rescue of coal mine.

Dynamic management system of devices based on mine Internet of Things

CHEN Duo, WANG Gang

2013, 39(5): 16-19.

<Abstract>(44) <PDF>(5)

Abstract:
For problems of artificial influence, over-maintenance or ill-maintenance, unable to reflect real-time status of running devices existed in account style mine devices management system, a design scheme of dynamic management system of devices based on mine Internet of Things was proposed. The system adds a function of analyzing and processing running status of mine devices on basis of the account style device management system, so as to realize dynamic management of mine devices. The system is based on opening architecture of mine Internet of Things, thus it can get monitoring data from application platform if corresponding sensors are connected in sensing layer. Meanwhile, the system uses LabVIEW to collect and process data and Silverlight technology to publish information, so as to improve friendliness and usability of the system.

Design and implementation of gas disaster early-warning system based on hot-standby

LI Ming-jian, DIAO Yong, ZHANG Yi

2013, 39(5): 19-23.

<Abstract>(65) <PDF>(4)

Abstract:
In view of problem of single-point failure in hardware and software running environment of gas disaster early-warning system of coal mine, a gas disaster early-warning system based on hot-standby was proposed, and its hot-standby solution, hardware and software design and implementation were introduced. The system employs high-reliability hot-standby cluster for mutual backup and hot-standby solution based on RoseHA and shared disc array, greatly improves its reliability. The application result shows that availability of the gas disaster early-warning system based on hot-standby is greatly improved with longer mean time between failures and shorter mean time for fixing failure, compared with the early-warning system based on single server.

Design of optical air chamber of infrared methane sensor

YANG Kang, YANG Xu-jun, LIU Jian-kang, XUE Ming

2013, 39(5): 24-26.

<Abstract>(45) <PDF>(5)

Abstract:
The paper introduced design method of structure of optical air chamber of infrared methane sensor in details, and derived that the optimal light path length of the optical air chamber is 60 mm, and the tests show that the sensor responses faster when diameter of the air chamber is 10~30 mm, thus determined the diameter of the infrared air chamber as 20 mm. It used RCS2000(A) automatic gas distributing system to make experimental test for the infrared methane sensor based on the optical air chamber, the test results validate good feasibility and sensitivity of the gas chamber.

Review of automation technology for fully mechanized coal face of thin seam

YU Yue-sen, ZUO Teng, ZHOU Juan, TANG Zhong-yu, WU Xiao-jie

2013, 39(5): 27-30.

<Abstract>(49) <PDF>(7)

Abstract:
The paper analyzed development status of automation technology for fully mechanized coal face of thin seam at home and abroad, introduced structure of automation system of fully mechanized coal face of thin seam, and automation control technology for shearer, electro-hydraulic control technology for hydraulic support, automation control technology for scraper conveyor and visualized monitoring technology of mining space environment. It pointed out development trend of automation technology for fully mechanized coal face of thin seam, that is to use advanced technique to improve working reliability of devices such as shearer and hydraulic support; to improve automation degree of automation system of fully mechanized coal face of thin seam, perfect control system and fault diagnosis system and improve adaptability for mining environments; to develop from chain traction to no-chain traction and electric traction; to further study visualized monitoring system of fully mechanized coal face.

Present situation of in-service detection technology of mine-used integrated protection devices and its development

LIU Tian-ye, ZHANG Zhi-jie

2013, 39(5): 30-33.

<Abstract>(51) <PDF>(4)

Abstract:
The paper pointed out problems of in-service detection technology of mine-used integrated protection devices in China such as some standards are difficult to operate, various types and models of integrated protection devices with fast update, introduced development course of mine-used integrated protection devices in China and characteristics of general detection devices, described present situation of in-service detection technology of mine-used integrated protection devices in China, proposed its development tendency in improving detection precision and automation level, higher fault analysis ability, more environmentally friendly, closer integration of computer and detection system, intelligent BIT technology and standardization.

Analysis of management differences between on-site assessment of mining products safety approval and certification and factory inspection of CCC

LI Mei-xiang

2013, 39(5): 34-36.

<Abstract>(47) <PDF>(3)

Abstract:
The paper introduced development of mining products safety approval and certification and CCC, summarizes related management situation, and analyzed management differences of the two certifications from certain aspects such as assessment rules, inspector management, assessment charges, etc., thus realizing the target for mutual learning.

Research of deployment of underground WSN node with configurable blind area

WANG Jie, TONG Min-ming, TANG Shou-feng

2013, 39(5): 37-40.

<Abstract>(58) <PDF>(3)

Abstract:
Based on analyzing deployment and coverage model of existing WSN node, and in view of disadvantages of difficulty in full coverage, high cost and node redundancy, the paper proposed a scheme of underground WSN coverage model and node deployment with configurable blind area, and introduced its application in mine underground. The deployment scheme of underground WSN node can adjust blind area scale according to actual condition of monitored object and realize blind area setting. The analysis result shows that the scheme covers larger area with the same quantity of nodes as full coverage; in the same monitoring area, the scheme needs less sensor nodes, not only saving system cost but also improving node redundancy problem in certain degree.

Analysis of influence of mining operation on measurement of electromagnetic radiation of rock burst

XU Jin-bei, LIU Xiao-fei, PAN Dong-wei, ZHU Ya-fei, DENG Xiao-qian

2013, 39(5): 41-45.

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

Abstract:
In order to analyze influence of each operation in mining process on measurement of electromagnetic radiation, a test was carried out on working face in Changgouyu Coal Mine and electromagnetic radiation monitoring signals of each operation were analyzed quantitatively. The results show that online electromagnetic radiation monitoring signals are mostly influenced by electrical equipments such as winch, scraper conveyor and bell which are main interference resources, and less interferenced by non-electric operation such as pillar compression and personnel moving. The research provides reliable basis for eliminating influence of interference sources while using electromagnetic radiation critical value method to judge coal-rock dynamic disaster at field.

Research of regularity of soft coal thickness and electromagnetic radiation in outburst coal seam

LI Xue-long, LIU Zhen-tang, LU Zhi-fei, MA Guo-qiang, FENG Jun-jun, JING Lin-bo

2013, 39(5): 45-48.

<Abstract>(46) <PDF>(3)

Abstract:
The paper studied relation between soft coal thickness and outburst of coal and gas, and got a conclusion that risk of outburst of coal and gas increases when soft coal thickness increases suddenly (rate of change ≥10%) or the thickness is more than 0.8 m over a period of time. In order to improve accuracy of outburst prediction, electromagnetic radiation is employed to analyze response regularity of soft coal thickness and electromagnetic radiation. The result shows that electromagnetic radiation of soft coal is higher than hard coal, and if soft coal thickness increases or sustains higher (≥0.8 m), value of electromagnetic radiation increases or sustains high too, outburst risk increases accordingly; there is a positive correlation between soft coal thickness and electromagnetic radiation, and the correlation coefficient is 0.824.

Research of coal-rock interface identification based on machine visio

TIAN Zi-jian, PENG Xia, SU Bo

2013, 39(5): 49-52.

<Abstract>(45) <PDF>(5)

Abstract:
In view of problems that coal-rock interface sensor has complicated structure, low reliability and universality in existing coal-rock identification method, the paper proposed a solution of coal-rock interface identification system based on machine vision. It gave general structure of the system, analyzed its working principle and focused on discussion of image feature selection and classifier design. The system extracts 22 textures of coal-rock images according to the theory of gray-level co-occurrence matrix, employs method of increasing l and decreasing r to search the optimized features, and builds coal-rock classifier model by linear function recognition. The experiment results show that the coal-rock classifier model of the system has stable performances and strong identification ability.

Research of coal-rock interface identification based on gray threshold method

HUANG Shao-jie

2013, 39(5): 52-54.

<Abstract>(47) <PDF>(5)

Abstract:
In view of problem of low accuracy of coal-rock interface identification, the paper took coal-rock image with higher color discrimination of a Coal Face as an example to use edge detection method and gray threshold method to make coal-rock segmentation processing for the image separately, and the processing result shows that the scheme of coal-rock interface identification based on gray threshold method has higher identification accuracy with obvious gray difference of color of coal-rock.

Research of dead-time compensation strategy for three-level inverter

YANG Ning, ZHANG Lin, XU Chun-yu

2013, 39(5): 55-59.

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

Abstract:
The paper analyzed dead-time effect and working principle of diode-clamped three-level inverter, proposed a dead-time compensation method which is suitable for diode-clamped three-level inverter based on double carrier modulation. By adjusting dead-time of trigger pulse on different current flow paths, the method realizes level conversion unaffected by dead-time, which means avoiding or reducing dead-time effect. The simulation result shows that the method reduces the 5th and 7th harmonic contents and total harmonic distortion, increases effective current value and has better compensation effect compared with normal dead-time compensation method.

Research of three-phase interconnected cascaded converter

FU Lan-fang, HE Hui-ying, LIU Bin, PAN Lei, ZHU Yan-cai

2013, 39(5): 59-62.

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

Abstract:
In view of problems that normal cascaded H-bridge converter needs multiple DC power supplies for topology and is difficult for realization of four quadrant running, or needs high cost and complicated control algorithm, a topological structure of three-phase interconnected cascaded converter is put forward with modulating solution. By every two phases interconnection of 3 three-phase two-level converting circuits, the converter has simple structure and high utilization efficiency of DC voltage; employing sample-time-staggered pulse-width modulation technology, and has lower switching loss and output waveform distortion. Matlab/Simulink simulation result shows that the three-phase interconnected cascaded converter based on sample-time-staggered pulse-width modulation has better sine wave and lower harmonic content for output waveform.

Analysis of relay protection action of grounding fault of no-load charging of a 330 kV transformer

LYU Bin, NI Sai-sai, LIU Yang, ZHONG Li-na

2013, 39(5): 63-66.

<Abstract>(48) <PDF>(3)

Abstract:
In view of problem that a 330 kV start-up standby transformer took place relay protection action in no-load charging, the paper indicated that the action was caused by grounding fault of A-phase current transformer through analyzing charging current waveform recorded by electric quantity analyzer, and gave several suggestions to improve safety and reliability of charging test of large-scale transformer: strengthen insulation inspection for current and voltage transformers of high-voltage side of transformer; properly increase sensitivity of main and backup protection to prevent relay protection action by inrush current; it should record for three-phase current and voltage of high-voltage side of transformer in charging process.

Design of temperature measurement circuit in oxidation kinetics testing for coal spontaneous combustion tendency

LI Hai-gang, WANG De-ming

2013, 39(5): 66-69.

<Abstract>(45) <PDF>(2)

Abstract:
High-precision measurement and record for temperature is needed in oxidation kinetics testing for coal spontaneous combustion tendency. Therefore, temperature measurement circuit was designed with high-resolution AD converter AD7714 and three-wire Pt100 thermal resistance as temperature sensor; method of piecewise linear interpolation is adopted for interpolation operation of output value to solve problem of non-strict linearity between input and output caused by nonlinearity of devices. The experiment result shows that AD sampling resolution of the circuit is high up to 0.006 7 ℃, meeting design requirements, and the experiment data has high stability and repeatability.

Research of joint dispatching of wind power generation and pumped storage

LIU Miao-miao, GUO Yan, CHEN Jiang-tao, YANG Zhe

2013, 39(5): 70-75.

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

Abstract:
For improving power quality of output of wind farm as well as economic efficiency of wind farm based on operation situation of grid-connected wind farm system, Gauss model and economic efficiency model of joint operating system of wind power generation and pumped storage were established, and a joint dispatching scheme of wind power generation and pumped storage based on multi-objective evolutionary algorithm of plant growth simulation was proposed. The simulation result shows that the scheme can improve not only power quality and smoothness of output power of wind farm, but also economic benefits and stability of wind farm compared with the optimization scheme of single objective.

Design of real-time control system of DC motor based on xPC Target

WANG Hai-quan, LIAO Lei, LI Hong-jun, WANG Dong-yu

2013, 39(5): 76-79.

<Abstract>(41) <PDF>(2)

Abstract:
In view of problems of low developing efficiency and reliability due to manual programming in traditional developing procedure of control system, the paper proposed a design method of real-time control system of DC motor based on xPC Target. The method employs code automatic generation technology and xPC real-time kernel of Matlab, builds control loop by using industrial control computer as controller and DC motor as controlled object, combines controller application program by using Simulink modular, realizes code generation, compiling and downloading of application program in target-host mode. The experiment result shows that code generation of the control system is fast and reliable, and the control system is more effective and stable by use of the method.

Design of material supply supermarket management system for coal enterprises

ZHANG Heng, LU Jian-jun, WEI Chen

2013, 39(5): 80-84.

<Abstract>(50) <PDF>(3)

Abstract:
In view of problems of information island and high cost of goods storage on information platform of coal enterprises, the paper proposed a design scheme of new-type material supply supermarket management system for coal enterprises, introduced general flow, overall framework, main functions and outstanding characteristics of the system in details. Taking each production zone of coal enterprise as source of material management, the system reduces storage and improves response flexibility. With three-layer structure based on B/S mode, the system has high development efficiency and ensures its security and reliability. And using bar-code scan device to obtain management information in real time, the system is more flexible. It is beneficial to material storage cost reduction and rational material distribution for coal enterprises.

Research of key technologies of dispatching and monitoring system for trackless rubber-tyred locomotive

LUO Ming-hua, GUO Hai-jun, CHEN Wei

2013, 39(5): 84-86.

<Abstract>(34) <PDF>(2)

Abstract:
The paper detailedly introduced implementation of key technologies such as locking mechanism in driving interval of underground substations, system capacity and layout scheme, system redundancy of dispatching and monitoring system for trackless rubber-tyred locomotive. The industrial result shows that the system based on the above technologies has higher reliability and dispatching time of single substation is less than 3 s.

Design of dynamic management information system for coal mine devices

MIAO Yong-xin, MA Hai-lin, WANG Zhi-rong

2013, 39(5): 87-89.

<Abstract>(52) <PDF>(4)

Abstract:
In view of problems of difficult management for field devices and hard to fulfill application of existing device management system in coal mine, the paper proposed a design scheme of dynamic management information system for coal mine devices. The system is based on uniform encoding management of devices in mine wide, takes responsible zone and team as unit, management device as object, personnel behavior as essential factor, rules, regulations and measures as standard, patrol routine as drive, and combines personnel location system, bar code, two-dimension code and patrol devices at related points, so as to realize life-cycle management for coal mine devices.

Statistics of coal mine safety accidents cause based on principal component analysis

WANG Yang

2013, 39(5): 90-92.

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

Abstract:
Taking occurrence frequencies of coal mine safety accidents in 2001—2011 as example, the first and second principal component of the coal mine safety accidents cause were obtained by use of principal component analysis method, and it was found out that the coal mine safety accidents mainly caused by roof fall accident and machinery accident through further analysis. The analysis result shows that the method has certain guidance for planning of coal mine safety facilities.

Setting method of deceleration point of integrated backup protection device of hoist

DU Hong-yan, XU Yong, XU Shan-tang, ZHOU Xue-feng, GUO Jun-ling

2013, 39(5): 92-94.

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

Abstract:
The paper gave rough formula of distance between deceleration point of integrated backup protection device of hoist and stop point, and calculation formulas of safe braking distance between a section or a point and stop point, safe braking distance of continual over speed judgment between a section or a point and stop point, and safe braking distance of continual over speed judgment between deceleration point and stop point successively. The point which is away pithead with the safe braking distance of continual over speed judgment between deceleration point and stop point is set as deceleration point. The setting method of deceleration point is fit for setting deceleration point of backup protection when deceleration point of electrical control system of hoist adjusts automatically according to loads. The application shows that deceleration point set by the method can ensure hoisting container stop under pithead safely when deceleration point of electrical control system of hoist loses efficacy with high reliability.

Analysis of safety protection function of ABB mine hoist system

ZHU Kai, GAO Feng, LIU Da-ling, ZHAO Hong-yan

2013, 39(5): 95-97.

<Abstract>(48) <PDF>(3)

Abstract:
The paper described important protection functions of electrical control system, brake control system and ACS6000 drive system of ABB mine hoist system. The practice shows that ABB mine hoist system runs in good condition and improves safety factor.

Design of health diagnosis system of mine hoist

ZHANG Guo-dong, QI Rui-mi

2013, 39(5): 98-100.

<Abstract>(52) <PDF>(4)

Abstract:
A health diagnosis system of mine hoist was designed taking LabVIEW software as platform. The system uses sensor to collect multi-channel data continuously, so as to realize real-time on-line monitoring for mine hoist; uses strong signal acquisition and signal analysis module of LabVIEW and combines with information fusion technology to analyze time domain and frequency domain signal of mine hoist, which provides reliable basis of health diagnosis for mine hoist.

Design of integrated protection device of belt conveyor based on LPC1752

LU Lan-yong, LIU Jian-gong

2013, 39(5): 100-102.

<Abstract>(45) <PDF>(5)

Abstract:
In view of protection requirements in coal mine safety regulation, an integrated protection device of belt conveyor based on LPC1752 was designed. Functions of the device were given and design of hardware and software of the device were introduced in details. The device employs advanced embedded technology and CAN field bus technology with complete protection functions, and can realize centralized control and remote control for belt conveyor. The field test result validates reliability of the device.

Reform of automatic flotation control system in Datun Coal Preparation Plant

MAO Dong-mei

2013, 39(5): 103-105.

<Abstract>(38) <PDF>(2)

Abstract:
In view of problems of bad flotation effect, high flotation reagent content and high cost in flotation system of Datun Coal Preparation Plant caused by manual operation, the paper proposed a reform scheme of automatic flotation control system, mainly introduced implementation of automatic reagent feeding control system and automatic flocculant feeding system. The practice shows that the reformed system reduces flotation reagent consumption per ton of coal, raises recovery rate of ash and coal flotation concentrate from flotation tailing, and greatly reduces amount of labor.

Design of safe production commanding platform of coal group

DU Jian-ping

2013, 39(5): 105-108.

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

Abstract:
In view of problem that information cannot be shared in original safe production commanding platform of a Coal Group between coal group and subordinate units, the paper proposed a design scheme of safe production commanding platform based on iFIX and iHistorian configuration softwares. It detailedly introduced construction process of the platform from three aspects of making of data encoding rules, data integration platform of mine terminals and data transmission. The actual application shows that the platform not only makes full use of flexibility of iFIX configuration software in developing business modules, but also makes full use of iHistorian configuration software in transmission, compression storage and multi-thread concurrence processing for mass data, which has certain practicality.

2013 Vol. 39, No. 5

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