1999 Vol. 25, No. 1

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Cover Catalogue
Coal Mine Monitoring and Control System Faced to Information Age
Xu Shi-fa
1999, 25(1): 1-3.
<Abstract>(51)
Abstract:
The author analyzes current status of coal mine monitoring and control system. In combination with developing trend for information society and the needs to develop enterprise informationization, he puts forward some points to improve coal mine monitoring and control system.
Research in Implementation of Radio Signaling, Centralizing and Locking System by Using Leaky Channel
Li Yong, Zhu Jian-ming, Hu Yu
1999, 25(1): 4-6.
<Abstract>(58)
Abstract:
A basic idea of utilizing residual channel in leaky communication system to transmit data and form radio leaky signaling, centralizing and locking system is put forward here, together with the design of overall structure, cornmunication control station, locomotive workstation and roadway workstation.
Research in Planetary Mechanism Soft Start System
Zhou Man-shan, Yu Yan, Zhang Yua
1999, 25(1): 6-8.
<Abstract>(34)
Abstract:
The paper focuses on the analysis on Model 2K-H Planetary Mechanism Soft Start System and deducts the characteristic relationships of torque, angular speed, power of input axle, inner gear, output axle and loads using constant acceleration start and sine angular acceleration.
Current Status of Research in On-line Measuring and Control Technique for Product Quality in Coal Separatio
Yang Jun-li, Ye Gui-seng
1999, 25(1): 9-11.
<Abstract>(54)
Abstract:
Automatic control of coal separation is for the purpose of improving productivity, while product quality must be ensured. There are many parameters that will affect the separation in the procedure of separation,among which, some must be stabilized in a optimum range and some are correlative that needs a optimum match. Human observation and manual operation can hardly meet it. Therefore automatic control is of great significance. The paper focuses on the current status and effects obtained in automatic control technique research for coal preparations in our country.
1999, 25(1): 11-13.
<Abstract>(42)
Abstract:
A Rebuilt Electrical Control System for Import Hoist Based on Simadyn-D Control Technique
FU Xiao-ping, YANG Ren-bing, JIANG Jian-guo, WU Xiao-jie, DAI Peng
1999, 25(1): 14-16.
<Abstract>(52)
Abstract:
For the problem existing in the former electrical control system of import hoist by Leonard drive, a rebuilt control scheme based on Simadyn - D control technique is proposed this paper. The applied results shows that the new full-digital control system after rebuilding features the operation on smooth and on safe side, and without any faulty. This new control system is satisfied with the need of production process.
1999, 25(1): 17-20.
<Abstract>(25)
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1999, 25(1): 21-22.
<Abstract>(44)
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1999, 25(1): 23-25.
<Abstract>(38)
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Probes in Propagation of Radio Wave in Mine Roadways
LIU Xi-lu, WANG SHeng-zhong
1999, 25(1): 25-26.
<Abstract>(24)
Abstract:
Application and experiment result of radio wave in roadways is introduced. In combination with the result, the author points out that radio wave attenuations in roadway is mainly by wave refraction and reflection rather than wall absorption. Desides long wave and medium wave frequency bands, ultra-short wave frequency band must be taken more attention. Finally the author gives some suggestions in improving radio propagation in roadways.
A New Type Intelligent Monitoring System for Mine Ventilatio
LIU Bin-yun, LU Da-wei
1999, 25(1): 26-28.
<Abstract>(33)
Abstract:
A new type intelligent monitoring system for mine ventilation is introduced with its structure,composition. working principle and performance indexes and analysis in instrument frequency measurina accuracy.The intelligent monitoring instrument is able to find out hidden dangers in coal mine ventilation system through the monitoring of underground air pressure, air velocity and temperature, etc. It is of practical significance in coal mine safe preduction.
1999, 25(1): 28-29.
<Abstract>(33)
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1999, 25(1): 30-31.
<Abstract>(48)
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1999, 25(1): 32-33.
<Abstract>(59)
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New Type Protection Device for Inclined Shaft Runaway Car
MA Zhi-mi
1999, 25(1): 33-34.
<Abstract>(61)
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A protection device against inclined shaft runaway car utilizing speed-sensitive component and single chip microcomquter technique is introduced.
Multi-wave-length Extinction Detection Method for Coal Mine Dust
TANG Gang
1999, 25(1): 35-36.
<Abstract>(76)
Abstract:
Based on the needs of coal mine dust measuring, the author puts forward that measring dust accuracy using multi-wave-length extinction and introduces the principle and principal designing scheme.
1999, 25(1): 37-40.
<Abstract>(13)
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1999, 25(1): 40-42.
<Abstract>(52)
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1999, 25(1): 42-43.
<Abstract>(47)
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1999, 25(1): 44-46.
<Abstract>(67)
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