工矿自动化

Design of On-line Monitoring System for Electromagnetic Radiation of Coal and Gas Bursting

QIAN Jian-sheng , CHEN Zhi-guo , ZHANG Jian-ying , ZHANG Wei

2002, 28(4): 1-3.

<Abstract>(54)

Abstract:
The paper analyzed and designed a set of on line monitoring system that convenient to predict and forecast coal and gas bursting on the basis of the principle of coal and gas bursting accompanied by electromagnetic radiation, and introduced the composition and functions of the system.

Distribution of Leakage Electromagnetic Field Intensity in Underground and Its Measurement

WANG Yi-hua

2002, 28(4): 3-5.

<Abstract>(59)

Abstract:
The paper probed into the regular pattern how to steadly and reliably transmit the signal of mobile communication system in underground by the theory analysis of transmission of leakage electromagnetic field in underground and the measurement of the distribution of field intensity in entry.

Proble on Measuring Methods of AC Characteristic Parameters

ZHANG Wei-ping

2002, 28(4): 5-8.

<Abstract>(61)

Abstract:

Study on Vibration Sensor of Ultra-low Frequency

FAN Yun-xiao , YU Tao , LIU Hua , ZHAO Yong-jun

2002, 28(4): 8-10.

<Abstract>(45)

Abstract:
This paper put forward the practical method of realizing vibration sensor of ultra low frequency by means of magnetoelectric velometer. Using the tandem type correcting circuit, the measurable minimum frequency was reduced to less than 0.6Hz while the optimal damping was changeless. System analysis and discussion on the correcting circuit, working principle, transfer function and difference of the output characteristic before and after correcting of vibration sensor of ultra low frequency had been done.

DC Speed Regulating System Based on Optimum PID Control Algorithm

WU Yan-hua, MENG Jiao-ru

2002, 28(4): 11-12.

<Abstract>(34)

Abstract:
A DC speed regulating system based on optimum PID control algorithm was proposed in this paper. The digitalized method of PID algorithm and installment method of the optimum PID parameters were introduced in order to realize high accuracy control of rotational speed by DC speed regulating system.

Research and Development of Energy Saving Device of Asyncronous Motor Based on Single-chip Microcomputer

GAO Yun , CHEN Qing

2002, 28(4): 13-15.

<Abstract>(27)

Abstract:
By the Γ-equivalent circuit of asyncronous motor, we came to the conclusion that the voltage of the power supply should change with the load’s change and the Mem/U2 should remain constant for the minimum loss. In terms of the conclusion, a energy saving device was designed based on single chip microcomputer control angle of flow of silicon symmetrica switch and the device’s energy saving rate curve was given which is changed with the load’s change.

Study on Extinction Coil Equipped in Coal Mine Power Supply System

WANG Qi-ju

2002, 28(4): 16-17.

<Abstract>(44)

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Schemes Selecting and Consideration of AC Speed Regulating System for Electric Locomotive Used in Coal Mine

MA Xian-min , SONG Gai-gai

2002, 28(4): 17-19.

<Abstract>(48)

Abstract:
The paper analyzed application situation and developing tendency of electric locomotive used in coal mine, probed into the key technology that speed regulating system of DC motor was reformed to speed regulating system of AC motor, and presented several possible schemes of AC speed regulating system of electric locomotive in coal mine underground.

Realization of Information Transmission and Packet Switching Based on DSP in ISDN of Coal Mine Underground

HUANG Ping, ZHANG Sheng

2002, 28(4): 20-22.

<Abstract>(39)

Abstract:
The paper introduced a new kind of ISDN network mode based on transmission characteristics of underground information. Then it explained the process of information transmission and the protocol of packet switching in this network. It also gave schemes on hardware and software design of network node based on DSP.

Designing Method of Multi-parameter Monitoring and Control System Based on PLC

WANG Jun , YIN Yuan-yuan , BAO Hai-yong

2002, 28(4): 23-24.

<Abstract>(31)

Abstract:
In the paper, implementation method of scan technology in multi parameter monitoring and control system based on PLC was introduced, hardware configuration and software implementation principle were given.

Design of Selecting System of Type for Master Ventilation in Coal Mine

CHEN Guang-zhu, HU Ya-fei

2002, 28(4): 24-27.

<Abstract>(56)

Abstract:

Realization of the Digital Triggering Device of Three-phase Inverter by Thyristor

GUO Jia-hu, WANG Qing-ling

2002, 28(4): 27-29.

<Abstract>(57)

Abstract:
A digital triggering device of three phase inverter by thyristor and the realizing methods of synchronized signal and phase shifting control were introduced, and the circuit diagrm of hardware and software design were also given.

A New Type of Dialing Supervisor

HUANG Yu-hang, LIU Min-jian, HE Guo-ying

2002, 28(4): 30-32.

<Abstract>(54)

Abstract:
The paper mainly introduced the designing scheme and operating principle of a kind of dialing supervisor connected between the city telephone lines and the telephone sets.

Development of Multi-level Control System for Pressure in Air Collector

GUO Yi-nan, CHENG Jian, TAN De-jia

2002, 28(4): 32-34.

<Abstract>(69)

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Application of Frequency Converter in Air Compressor

ZHANG Yi-jie

2002, 28(4): 34-35.

<Abstract>(63)

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Inprovement of Model KF1016 Mine Used Multiplex UPS and Its Applicatio

SHANG Zhan-ning, SUN Shou-jing, SHENG Wei-guang

2002, 28(4): 36-37.

<Abstract>(38)

Abstract:
The paper introduced the working principle of model KF1016 mine used multiplex UPS after improvement and the advantages of its practical application in coal mine underground, which provided assurance for reliability service of control and monitoring system.

A Microcomputer Control System for Quenching by Plasma

HAN Qi-cheng, CHENG Xiao-nong, XU Ke-bao, ZHOU Xue-feng

2002, 28(4): 37-39.

<Abstract>(25)

Abstract:

Network Examination System Based on B/S Mode

ZHANG Xiao-ya

2002, 28(4): 39-41.

<Abstract>(35)

Abstract:
According to the background of network examination, the paper discussed the character of Browser/Server mode. It also analyzed the designing principle, the function implementation and the key technology of network exmination.

Stated of Several Important Parameters in Frequency Converter

LIU Fu-zeng, YUAN Ru-dong

2002, 28(4): 42-43.

<Abstract>(44)

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Development of Full Digit Monitor about Distance-speed for Mine Hoist

CHEN Wei-xin, JIANG Hua, WEI Yong-ping, LIU Jing-xiong

2002, 28(4): 43-45.

<Abstract>(29)

Abstract:

The Control System of Numerical Control Aligner and Probe of Its Measuring Interface in Windows

JIANG Hong-xu