2013 Vol. 39, No. 8

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Technical requirements of communication system for safe and efficient mine
SUN Ji-ping
2013, 39(8): 1-5. doi: 10.7526/j.issn.1671-251X.2013.08.001
<Abstract>(52) <PDF>(5)
Abstract:
Technical requirements of mine wired dispatching communication system, mine broadcast communication system, mine mobile communication system with multi base stations, mine leakage communication system, mine inductive communication system, mine through-the-earth communication system, mine rescue communication system were put forward. Mine broadcast communication system should have functions such as audio and video broadcast, multicast, anycast, tape recording and recording. It should also have function of intercommunication between dispatching desk and underground terminal. The underground terminal could call the dispatching desk on the ground. Mine mobile communication system with multi base stations should have functions of communication among mobile stations and between mobile station and fixed telephone. It should have abilities to transfer data and short message, to register location information of mobile stations, to handover between different regions, to set priority, time limit of different users and to forbid illegal users. It should also have functions of relay-tandem, self diagnosis and failure indication. Mine rescue communication system should have functions of communication between mobile stations, communication between mobile station and base station, communication between mobile station and base communication terminal on the ground and communication between base station and base communication terminal on the ground. It should have abilities to launch urgent calling, general calling and group calling. It should also have functions such as talkaround of base station and mobile station, video monitoring, monitoring of CH4, CO, O2 and temperature, and monitoring of heartbeat, temperature, posture of rescuer.
Application of face recognition technology in mine personnel management system
XU Xi-liang, HUO Zhen-long
2013, 39(8): 6-8. doi: 10.7526/j.issn.1671-251X.2013.08.002
<Abstract>(29) <PDF>(4)
Abstract:
In view of problem of cheating when mine personnel goes downhole, a mine personnel management system based on face recognition technology was designed. When a person goes into mine, the system collects his facial image which is compared and checked with stored template image. If passing the check, the person is approved to go into mine, conversely, failed to go. The experiment result shows that the system has quick recognition speed, high accuracy and solves the problem of cheating for mine personnel downhole.
Application of automatic mining technology of unmanned coal face of thin seam
WANG Gang, FANG Xin-qiu, XIE Xiao-ping, RUAN Fei-xiong
2013, 39(8): 9-13. doi: 10.7526/j.issn.1671-251X.2013.08.003
<Abstract>(71) <PDF>(2)
Abstract:
In view of requirement of safe and high efficient mining for protection layer of thin seam of a coal mine, the paper proposed a design scheme of unmanned coal face mining for upper protection layer of No.2 thin seam of the coal mine. According to actual situation of 22201 first coal face of the No.2 thin seam, it gave matching equipment selection of shearer, hydraulic support and scraper conveyor of the 22201 unmanned coal face, and introduced network structure and mining process of automatic control system of the 22201 unmanned coal face in details. The industrial test result shows that the scheme can automatically finish production process of coal cutting, support advancing, scraper conveyor pushing and roof supporting, and realizes automatic mining for thin seam coal face.
Design of directional antenna of uniqueness detection device of identification card
GUO Hai-ju
2013, 39(8): 13-15. doi: 10.7526/j.issn.1671-251X.2013.08.004
<Abstract>(33) <PDF>(3)
Abstract:
In view of problems that traditional detection device of identification card cannot detect card effectively at assigned area and has error identification area, a directional antenna with narrow band and high gain was designed. Through changing gain and direction angle of omnidirectional antenna of the traditional detection device of identification card, width of horizontal lobe is reduced from 180° to less than 90°, parameters of length, width and matrix arrangement mode of the antenna are analyzed and optimized by using Ansoft HFSS electromagnetic simulation software, so as to realize good performances of narrow band, direction and high gain. The actual application shows that the antenna can ensure uniqueness detection device of identification card well accord with relative requirements of AQ 6210-2007 and AQ 1048-2007.
Implementation of speaker-depended speech recognition algorithm in VC++
FAN Bing-hui, ZHOU Kai, JI Peng
2013, 39(8): 16-21. doi: 10.7526/j.issn.1671-251X.2013.08.005
<Abstract>(36) <PDF>(3)
Abstract:
In view of problems of huge words database and complex training process existed in current speaker-independent speech recognition system, a speaker-depended speech recognition algorithm was implemented by using VC++. The algorithm uses method of pre-emphasis first then endpoint detection to eliminate influence of low-frequency noise; selects two indexes of short-time energy and short-time zero-crossing rate as criterion of endpoint detection for speech signal; adds judgment of tolerable mute time to ensure integrity of speech data; uses improved dynamic time warping algorithm to make pattern matching which reduces computation under premise of not influencing calculating results. The test result shows that the algorithm can recognize short words and short sentences real-timely and accurately with faster recognition speed.
Research of a new underground wireless communication system
WU Xian-li, WANG Peng, WEN Liang, LANG Qi
2013, 39(8): 22-25. doi: 10.7526/j.issn.1671-251X.2013.08.006
<Abstract>(64) <PDF>(5)
Abstract:
In view of problems of long setup time of communication link, bad voice quality and unable for online existed in common rescue communication telephone for emergency rescue, the paper proposed a design scheme of underground wireless communication system based on Mesh multi-hop and FHSS. The scheme uses backbone routing nodes and relay routing nodes to build basic structure of Mesh multi-hop, meanwhile uses multi-radio and multi-channel technology to improve capacity, multi-hop times and coverage ranges of multi-hop subsystem. For solving problems of technologies of multi-frequency antenna and wireless routing with different frequency, the scheme uses improved minimum cost routing algorithm to ensure wireless transportation select the best routing link under condition of enhancing of underground uncertain factors. The test result shows that the system can send related underground information to surface rescue and command center, and can realize direct communication and communication command between surface rescue and command center and rescuer with higher ability of emergency rescue.
Design of detection and analysis system of flocculating sedimentation of thickener
WANG Wei-dong, REN Wei, SUN Jun-tao, SUN Yuan
2013, 39(8): 25-27. doi: 10.7526/j.issn.1671-251X.2013.08.007
<Abstract>(72) <PDF>(2)
Abstract:
In view of requirement of automatic closed-loop control for agent addition of thickener, a detection and analysis system of flocculating sedimentation of thickener was designed. The system uses CN141 turbidimeter to detect effect of flocculating sedimentation when concentration of slime water is less than 5%, and the turbidimeter outputs 4～20 mA current signal to microprocessor directly. The system uses micro-capacitor array sensor to detect effect of flocculating sedimentation when concentration of slime water is 5%～35%, the detected result is sent to microprocessor after amplified and filtered. The actual application shows that the system can detect effect of flocculating sedimentation of thickener accurately and real-timely and realizes closed-loop control of flocculant addition of thickener.
Research of hybrid positioning method based on mine WiFi communication system
PENG Xia
2013, 39(8): 28-31. doi: 10.7526/j.issn.1671-251X.2013.08.008
<Abstract>(43) <PDF>(3)
Abstract:
The paper analyzed principles of current mine target positioning methods and their existed problems: range-free positioning can only determine range of targe nodes, so it has low positioning precision, such as positioning methods based on radio frequency identification, beehive cell identification and wireless sensor network. Range-based positioning has higher positioning precision, but positioning methods based on angle of arrival, time of arrival and time difference of arrival have higher requirements for hardware devices and are difficult to applied in coal mine underground; positioning method based on received signal strength indication is easy to realize but its positioning precision would reduce due to influence of environmental noise. The paper proposed a hybrid positioning method based on mine WiFi communication system. The method includes coarse positioning and fine positioning: coarse positioning uses range-free positioning method based on beehive cell identification to determine area range of target; fine positioning uses range-based positioning method based on received signal strength indication. The method can improve positioning precision of target without increasing complexity of positioning system.
Research of data transmission network technology in gathering process of coal-bed gas
PEI Hong, ZHAO Meng, WANG Ying-guang, WANG Yi
2013, 39(8): 32-34. doi: 10.7526/j.issn.1671-251X.2013.08.009
<Abstract>(22) <PDF>(2)
Abstract:
Data transmission network technology is key link of realizing safe and high-efficient gathering production of coal-bed gas. The paper introduced gathering process of coal-bed gas like neural networks and its characteristics, indicated requirements of gathering process of coal-bed gas to data transmission network technology. Through analyzing existed problems of current data transmission technologies namely transmission network based on wired media, wireless network based on GPRS and wireless network based on 3G applied in gathering process of coal-bed gas, the paper proposed a self-built wireless network framework which is suitable for characteristics of gathering process of coal-bed gas and analyzed its technical advantages. It indicated that the framework could provide an effective data transmission mean for safe and high-efficient gathering of coal-bed gas.
Research of frequency signal transmission of mine-used sensor
TANG Chao-ming
2013, 39(8): 35-38. doi: 10.7526/j.issn.1671-251X.2013.08.010
<Abstract>(15) <PDF>(8)
Abstract:
In view of problem that monitoring and control system has error alarm and error power off due to frequency signal transmission mode of mine-used analog sensor is interfered by outer interference, the paper analyzed transmission performance and interference performance of frequency signal, proposed anti-interference measures such as differential transmission, sine-wave transmission, current transmission, bus transmission and reducing transmission frequency, and indicated CAN bus with multi-host would be development trend of signal transmission mode of mine-used sensor.
Application of fuzzy PID and Hopfield neural network in mine ventilation system
MIAO Xiao-peng, SANG Zhen-hua
2013, 39(8): 38-41. doi: 10.7526/j.issn.1671-251X.2013.08.011
<Abstract>(28) <PDF>(3)
Abstract:
In view of problem that traditional PID control and single fuzzy control cannot control air flow of mine ventilation system accurately, the paper proposed a control method for rotational speed, air door and air flow of mine ventilator by using fuzzy PID regulator and Hopfield neural network regulator. The method employs fuzzy controller to correct PID parameters real-timely and combines association memory function and feedback regulation performance of Hopfield neural network, so as to realize quick and steady output of mine ventilator. The results of simulation and experiment show that the fuzzy PID regulator and Hopfield neural network regulator can control rotational speed and air flow of mine ventilator accurately and realize steady output of ventilation system.
Research of spectrum sensing algorithm of cognitive radio based on improved D-S evidence theory
XIAO Shu-yan, CUI Jie
2013, 39(8): 42-46. doi: 10.7526/j.issn.1671-251X.2013.08.012
<Abstract>(11) <PDF>(2)
Abstract:
In view of problem that spectrum sensing algorithm of cognitive radio based on D-S evidence theory will due to an inconsistent result when sensing information of cognitive nodes has serious conflict, the paper proposed a spectrum sensing algorithm of cognitive radio based on improved D-S evidence theory. The improved algorithm uses a new weighted average method to average each evidence to further reduce influence of abnormal evidences compared with arithmetic average method. Meanwhile, the improved algorithm calculates weight of evidence through calculating distance from evidence to average evidence, which can solve complexity problem of weight calculation. The experiment result shows that the improved algorithm can effectively improve sensing performance of spectrum sensing system of cognitive radio when sensing information of cognitive nodes has serious conflict.
A fault location method of underground distribution network
ZHAO Min, LYU Meng, KANG Xian-feng
2013, 39(8): 46-51. doi: 10.7526/j.issn.1671-251X.2013.08.013
<Abstract>(13) <PDF>(2)
Abstract:
In view of problems that it can only obtain local optimal solution by using random choice method and K-means clustering method to determine center and width of nodes of hidden layer of RBF neural network, and PSO algorithm is easy to premature convergence and has bad precision for some functions, the paper proposed an improved PSO algorithm which combines with inertia weight model and convergence factor model. In view of problems of difficult positioning for single-phase grounding fault in underground distribution network, bad reliability and low precision existed in traditional fault location methods, the paper proposed a single-phase grounding fault location method of underground distribution network by using the improved PSO algorithm to optimize RBF neural network. The simulation results show that location precision of RBF neural network optimized by the improved PSO algorithm is higher than RBF neural network, and can realize accurate and reliable location for fault point.
Research of fast fault positioning system of distribution network
WANG Shi-bi
2013, 39(8): 52-55. doi: 10.7526/j.issn.1671-251X.2013.08.014
<Abstract>(13) <PDF>(2)
Abstract:
The paper proposed a design scheme of fast fault positioning system of distribution network. The system uses pole-mounted fault monitoring terminal to recognize faults and control master station to position fault section, the both exchange data through GPRS communication processor; uses instantaneous over-current method to recognize short circuit fault and total current method to recognize grounding fault. For situations of missing and distortion of fault information, the system uses tristate identification method to improve traditional positioning algorithm of fault section. The simulation result shows that the improved positioning algorithm of fault section can accurately position fault under situations of missing and distortion of fault information, it has high fault tolerance.
Research of harmonic current detection method based on generalized integrator
LIU Yang, WANG Xiao-ying
2013, 39(8): 56-60. doi: 10.7526/j.issn.1671-251X.2013.08.015
<Abstract>(17) <PDF>(2)
Abstract:
In view of harmonic detection link of four-leg active power filter, the paper proposed a harmonic current detection method based on generalized integrator, and analyzed detection principle of the detection method and influence on detection effect of harmonic current by change of parameter k. The simulation result shows that the detection method can extract fundamental component of harmonic current when frequency of power network is stable; the parameter k influences on rapidity and accuracy of detection, so it should be set reasonably; the detection method has certain adaptability to distortion of power voltage, fluctuation of power frequency and unbalance of three-phase load with simple structure and being easy to realize.
An improved method of harmonic current detectio
JIN Ming-shui, ZHAO Long-zhang, SHAO Xian-jing
2013, 39(8): 60-64. doi: 10.7526/j.issn.1671-251X.2013.08.016
<Abstract>(11) <PDF>(2)
Abstract:
In view of problems that traditional ip-iq harmonic current detection method can get fundamental frequency and initial phase angle of three-phase current by using PLL, but the method has low detection precision and complex circuit when power voltage occurs distortion, the paper proposed an improved method of harmonic current detection without PLL. It detailedly analyzed detection principle of the improved method under conditions of symmetric and asymmetric three-phase current when power voltage occured distortion, and gave implementation of the improved method applied in harmonic current detection of single-circuit. The experiment results show that the improved method can detect harmonic current accurately and real-timely and has simple algorithm.
Research of active power filter based on one-cycle control and ip-iq detection method
KANG Zeng-shang, LI La
2013, 39(8): 65-68. doi: 10.7526/j.issn.1671-251X.2013.08.017
<Abstract>(31) <PDF>(2)
Abstract:
In view of problem that active power filter based on one-cycle control can only compensate harmonic and reactive component simultaneously, a design scheme of active power filter based on one-cycle control and ip-iq detection method was proposed. Fundamental components including harmonic or reactive component or the both detected by ip-iq detection method are took as reference signal of one-cycle controller, signal of power current is took as input signal of one-cycle controller. The two signals generate compensation current through one-cycle controller, so as to realize the purpose of compensating harmonic individually or compensating harmonic and reactive component simultaneously. The simulation and experiment results validate feasibility of the scheme.
Research of quantitative detection of coal samples based on near infrared spectrum
CHEN Peng-qiang, LU Hui-shan, YAN Hong-wei
2013, 39(8): 68-71. doi: 10.7526/j.issn.1671-251X.2013.08.018
<Abstract>(20) <PDF>(3)
Abstract:
In view of requirement of quick and online detection for coal quality, the paper uses Fourier transform near infrared spectrum to separately build partial least square models of water, ash and volatile combining with different spectrum preprocessing methods, namely smooth processing method, differential method, multiplicative signal correction method and standard normal variate method, and makes decussation verification for detecting result of the models. The result shows that the partial least square model of water bulit by 25 points smooth processing method is better, the partial least square model of ash built by standard normal variate method is the best, precision of the partial least square model of volatile built by 5 points smooth processing method is the highest, which validates feasibility of applying Fourier transform near infrared spectrum technology to analyze coal indexes.
Research of three-phase three-level PWM rectifier based on double closed-loop control
LIU Hui
2013, 39(8): 72-75. doi: 10.7526/j.issn.1671-251X.2013.08.019
<Abstract>(31) <PDF>(2)
Abstract:
In view of characteristics of less output harmonics, low distortion rate of current and suitable for development of high-voltage and large capacity, the paper proposed a design scheme of three-phase three-level PWM rectifier based on double closed-loop control. It analyzed principle of main circuit and building of mathematical model of the rectifier, introduced implementation of control strategies of double closed-loop with voltage loop and current loop and neutral-point voltage balance in details. The simulation result of Matlab/Simulink shows that the rectifier has good dynamic and stable performances.
Research of switched reluctance wind power generating system
JIN Xin, JI Li-li
2013, 39(8): 76-79. doi: 10.7526/j.issn.1671-251X.2013.08.020
<Abstract>(28) <PDF>(2)
Abstract:
In view of problems of bad stability of wind power generating system based on asynchronous generator, doubly-fed generator and permanent magnet synchronous generator, needing many conditions and being difficult to realize in experimental research of wind power generating system, the paper proposed a research method of wind power generating system based on switched reluctance generator under situation of no experimental condition of wind farm, that is using DC motor to simulate wind generator to make experiment for switched reluctance generating system. It built simulation model of DC motor simulating wind generator, and introduced close-loop control scheme of the maximum output power of switched reluctance generating system based on the model. The simulation result shows that the control scheme enables the established power generating system into power adjustment and stable running.
Improved maximum power point tracking strategy of doubly-fed wind generator
LIANG Yi-qun, WANG Hua-jun, CHEN Li
2013, 39(8): 80-84. doi: 10.7526/j.issn.1671-251X.2013.08.021
<Abstract>(14) <PDF>(3)
Abstract:
In view of problem that traditional extremum seeking strategy of maximum power point tracking of doubly-fed wind generator takes sine signal as seeking signal, and the sine signal is difficult to be distinguished from output signal, the paper proposed an improved maximum power point tracking strategy which uses wind turbulence as extremum seeking signal. The improved strategy makes Fourier transform for blade top speed ration and power coefficient to obtain phase difference information, so as to determine change direction of blade top speed ration to make doubly-fed wind generator reach the best running point. The simulation result shows that the improved strategy can control rotational speed of wind generator to track change of wind speed well and realizes maximum wind energy capturing in running region under rated wind speed.
Simulation of sliding-mode control of wind energy conversion system of permanent magnet synchronous generator
WANG Wu
2013, 39(8): 84-87. doi: 10.7526/j.issn.1671-251X.2013.08.023
<Abstract>(14) <PDF>(2)
Abstract:
In view of problem of bad stability of wind energy conversion system based on linear constant controller caused by stochastic volatility of wind speed, the paper proposed a design scheme of wind energy conversion system of permanent magnet synchronous generator based on sliding-mode control. It analyzed building principle of model of wind turbine, model of driving device and model of permanent magnet synchronous generator in the system , and introduced implementation of sliding-mode control strategy. The simulation result shows that the system has good speed tracking characteristic to realize maximum wind energy capturing.
Research of performance of serial communication network of continuous conveying system
GAO Xu-bin
2013, 39(8): 88-92. doi: 10.7526/j.issn.1671-251X.2013.08.024
<Abstract>(23) <PDF>(3)
Abstract:
The paper introduced structure and communication flow of main station of original serial communication network of continuous conveying system, indicated that problems of low bus communication efficiency and communication fault of slave station in the original communication network would lead to network paralysis, and proposed an improved serail communication network of continuous conveying system. The improved communication network divides the original communication network into two parallel communication networks, and uses methods of reducing communication access amount, improving baud rate and changing communication error control mode to solve various communication contradictions. The actual application shows that the improved communication network has reliable running and timely response, and promotes reliability of continuous conveying system.
Application of mine-used IP network broadcast system in Baode Coal Mine
FU Yuan, ZHU Sai-hu
2013, 39(8): 92-94. doi: 10.7526/j.issn.1671-251X.2013.08.024
<Abstract>(0) <PDF>(1)
Abstract:
The paper compared characteristics of various mine-used broadcast systems, and got conclusion that mine-used IP network broadcast system is better to be used in Baode Coal Mine underground. It introduced structure, features and functions of the mine-used IP network broadcast system. The actual application shows the system realizes functions of emergent broadcast under emergency condition, daily voice playing and intercom.
Design of online separation system for coal and gangue
CHENG Xue-zhen, WANG Wei, WEI A-ying
2013, 39(8): 95-98. doi: 10.7526/j.issn.1671-251X.2013.08.025
<Abstract>(17) <PDF>(2)
Abstract:
In view of problems of complex devices and needing a large amount of water in current common raw coal separation methods, an online separation system for coal and gangue based on dual-energy γ-ray and digital image recognition technology was designed. The single-chip microcomputer real-timely judges materials under detector whether coal or gangue, if it is coal, spray gun has no-action, if it is gangue, the single-chip microcomputer controls the spray gun spray high-pressure gas to insufflate the gangue into gangue channel. When the coal has many impurities or the gangue has many carbons, image recognition module distinguishes coal and gangue according to gray differences between coal and gangue, and sends recognition result to the single-chip microcomputer. The simulation test result shows that the system can recognize coal and gangue effectively and its recognition precision meets requirements of industrial production.
Research of integrated model of heterogeneous system of coal enterprises based on BizTalk
ZHONG Yu
2013, 39(8): 98-101. doi: 10.7526/j.issn.1671-251X.2013.08.026
<Abstract>(10) <PDF>(2)
Abstract:
The paper analyzed development status of heterogeneous system of coal enterprises, indicated existed problems of current information integrated methods: data warehouse method has bad real-time performance for data synchronization; middle-ware method has strong dependence for network and low query efficiency; comprehensive integrated method has strong dependence for middle-ware and high construction cost. So it proposed an integrated model of heterogeneous system of coal enterprises, gave design goal based on real-time performance, safety, consistency and integrity, expansibility of the model, introduced general framework and data flow of the model in details. The actual application shows that the model can meet requirements of integrated platform of heterogeneous system of coal enterprises.
Design of electrical control system of roadheader based on PLC
ZHAO Si-hai, HU Yu-wei, ZHAO Zhe-qian, DONG Wei-kang, GUO Ge, GUO Yan-che
2013, 39(8): 102-104. doi: 10.7526/j.issn.1671-251X.2013.08.027
<Abstract>(19) <PDF>(3)
Abstract:
In view of problems of low reliability and high fault rate in traditional electrical control system of roadheader, an electrical control system of roadheader based on PLC was designed. General structure of the system was given, design of hardware and software and implementation of remote control of the system were introduced in details. The actual application shows that the system has stable and reliable running and complete protection functions, which meets working requirements of roadheader.
Design of integrated LED lighting system of mine locomotive
JIANG De-chang, LIU Man-xi
2013, 39(8): 105-108. doi: 10.7526/j.issn.1671-251X.2013.08.028
<Abstract>(17) <PDF>(2)
Abstract:
In view of problems of low illumination, short range, being easy to happen rear-end accident and high electricity consumption existed in incandescent lamp lighting system of mine locomotive, the paper proposed an implementation scheme of integrated LED lighting system of mine locomotive. It introduced design points of LED lighting lamp, circuit of constant-current source, modular inverter and parallel current sharing of mosfet in details. The actual application shows that the system has low electricity consumption and good power saving effect, which eliminates hidden danger in transportation of mine locomotive, solves problems of integration of white illuminator and red tail lamp, separation of high-volage and low-voltage in inverter.
Design of data analysis system of mine electromechanical equipments
CHENG De-qiang, TANG Jin, GUO Bao-wen, ZHANG Lei
2013, 39(8): 108-110. doi: 10.7526/j.issn.1671-251X.2013.08.029
<Abstract>(26) <PDF>(3)
Abstract:
In view of problems that it cannot find potential fault real-timely, and has low equipment utilization rate and production efficiency, a data analysis system of mine electromechanical equipments was designed. The system uses iHistorian server to store data of each collection point of mine electromechanical equipments, analyzes the data from five aspects of basic data, reliability, energy consumption, efficiency and pre-warning, and stores the results in database of SQL Server for using by client through Web server. The actual application shows that the system can feedback running status of mine electromechanical equipments real-timely, and ensure real-time analysis and pre-warning of safe and highly efficient running for running data of mine electromechanical equipments.
Research of mine safety monitoring and control system based on 6LoWPA
ZHANG An-ra
2013, 39(8): 111-114. doi: 10.7526/j.issn.1671-251X.2013.08.030
<Abstract>(18) <PDF>(2)
Abstract:
In view of problems of high dependence on monitoring master station, narrow wireless coverage range, inconvenient deployment for sensors existed in traditional mine safety monitoring and control system, a mine safety monitoring and control system based on 6LoWPAN was designed. General framework of the system was given and software design of the system was introduced in details. The test result of temperature data collection shows that temperature value collected and transmitted by the system is consistent with actual temperature value and the system runs stably.
Design of automatic drainage system of underground influx point of water flush and transfer sump
DING Li-ping, ZHU Xiao-jie, WANG Qi-feng, JIANG Wei
2013, 39(8): 114-116. doi: 10.7526/j.issn.1671-251X.2013.08.031
<Abstract>(19) <PDF>(3)
Abstract:
In view of problems of low working efficiency and bad reliability in current drainage system of underground influx point of water flush and transfer sump by using manual control, an automatic drainage system of underground influx point of water flush and transfer sump based on structure of ring network was designed. Design of hardware and software of the system were introduced in details. The test result shows that the system has stable and reliable running and high control efficiency.

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