1997 Vol. 23, No. 3

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A Single Chip Microcomputer Based DC Motor′s Speed Regulating System With All Digital and PLL Control
HUANG Wei-ping, FAN Xi-de
1997, 23(3): 2-5.
<Abstract>(11)
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This paper reports on the application of the phase lock loop (PLL) technique to DC motor′s speed regulating and the realization of a all digital PLL system based on single chip microcomputer. In the system a variable structure was applied, and functions of speed setting, all digital trigger, three loops PI algorithm, M/T method and speed show were realized.
1997, 23(3): 6-8.
<Abstract>(11)
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1997, 23(3): 9-9.
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Designing of Large LED Electronic Screen Displaying System for Producing and Safty Dispatching Used in Coal Mines
QIAN Jian-sheng, MA Yong, WANG Xin-hong
1997, 23(3): 10-12.
<Abstract>(47)
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By comparing with the merits and demerits of displaying patterns of producing and safety dispatching systems in coal mines, this paper presented and analysed the equipment, functions and characteristics of the large LED electronic screen displaying system, which is suitable for the producing and safety dispatching systems in coal mines.
Study of Intellectualizing Substation Simulating System
MENG Xiang-zhong, DU Zhao-wen, LAI Chang-ga
1997, 23(3): 13-15.
<Abstract>(38)
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This paper gives a kind of design concept of the intellectual technology application in substation simulating system to meet the need for the safe in substation operation,and it is a good practice to be used.
Real time Communication System of Main and Subsequent Microcomputer in Substation Monitoring System
TANG Xiang, CUI Lan, HUANG Xian-hua
1997, 23(3): 15-18.
<Abstract>(38)
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The thesis introduced the real time communication system of main and subsequent microcomputer about monitoring system in electric transformer station.By the interrupt processing of computer,the communication system is realized.It also introduced the principle of hardware structure and program flow chart of communication.
Mixing Errors Control of Digital Transmission on Convolutional Code in Underground Leaky Moving Communication System
WANG Hui-min, XU Li-zhong, MA Xiao-ping
1997, 23(3): 18-21.
<Abstract>(27)
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The paper not only designed(2,1,7) convolution code in order to meet the demand of correcting the digital transmission mixing errors in underground leaky moving communication system,but also discussed the compilation principle and the software relization and the crisscross teachnology of the convolutional code.The method of the correctiong error codes has practical value.
1997, 23(3): 22-24.
<Abstract>(39)
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1997, 23(3): 24-26.
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1997, 23(3): 27-30.
<Abstract>(23)
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The Application of Centralised Monitoring and Control System for Underground Belt Conveyors
PAN Yu
1997, 23(3): 30-33.
<Abstract>(29)
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Taking the centralised monitoring and control system for underground belt conveyors, co developed by Huainan Mining Institute and Xinglongzhuang Coal Mine of Yanzhou Mining Bureau as an example, introduces the application of centralised 更多还原
1997, 23(3): 34-38.
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1997, 23(3): 38-40.
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1997, 23(3): 41-43.
<Abstract>(26)
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1997, 23(3): 44-46.
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1997, 23(3): 47-49.
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1997, 23(3): 50-52.
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Asynchronons Communication in Virtual Dispatching Exchange
WU Xiao-qiang
1997, 23(3): 53-54.
<Abstract>(35)
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In the paper,it is introduced that the problem of remote multi machine communication is solved between virtual dispatching exchange main machine and the dispatching desks without increasing cost,with MAX 1480 chip of MAXIM utilized and a series of software.
VOD Technology and Research of Its Application in Coal Mine
LIU Fu-qiang, QIAN Jian-sheng, SU Jun, CAI Jun-liang, WANG Guo-shu
1997, 23(3): 55-58.
<Abstract>(32)
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This paper introduces the conception,forming,key technology of VOD,and analyzes its application prospect in coal mine.
1997, 23(3): 58-60.
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1997, 23(3): 60-62.
<Abstract>(27)
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1997, 23(3): 62-65.
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1997, 23(3): 66-68.
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1997, 23(3): 69-69.
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