工矿自动化

Technologies of emergency refuge and rescue used in underground coal mine

SUN Jiping

2014, 40(1): 1-4. doi: 10.13272/j.issn.1671-251x.2014.01.001

<Abstract>(65) <PDF>(3)

Abstract:
The paper analyzed special pipeline technology for emergency refuge, and pointed out that “six systems” with the special pipeline for underground safe refuge can improve anti-disaster ability of pipeline, but the underground safe refuge system derived from the special pipeline cannot replace coal mine communication system, monitoring and control system and personnel positioning system, and it cannot perceive disasters. It compared and analyzed technical characteristics of life-saving shelter and refuge chamber, pointed out that the life-saving shelter has shortcomings of being susceptible by disaster, needs cooling and high cost. It put forward that coal mine should be equipped with high-power submersible pump, and should be careful to use rescue equipments of flood drilling. It proposed area captain and group leaders should be part-time draegerman. It also proposed that hand-over works should try to be completed on the ground, so as to reduce underground personnel.

Design of underground precise positioning system based on CSS technology

ZHANG Kefan, ZHU Haixia, BAO Jianjun

2014, 40(1): 5-8. doi: 10.13272/j.issn.1671-251x.2014.01.002

<Abstract>(41) <PDF>(3)

Abstract:
Most underground positioning systems can only provide regional positioning function and are unable to provide accurate real-time location information for personnels or equipments, a design scheme of underground precise positioning system based on CSS technology was proposed. The system uses SDS-TWR localization algorithm and positioning management protocol to get high positioning accuracy. Meanwhile, it does't need to do clock synchronization, which enhances realizability and stability of the system. The testing results show that the system realizes high-precision positioning for underground equipments and personnels, which positioning accuracy is less than 3 m and the farthest transmission distance is 350 m.

Design of intelligent lighting system based on Internet of Things for perception mine

ZHANG Kaiting, ZHU Jing, WANG Fang, XU Zhao

2014, 40(1): 9-12. doi: 10.13272/j.issn.1671-251x.2014.01.003

<Abstract>(92) <PDF>(6)

Abstract:
In view of problems of low intelligentization and high energy consumption of existing mine lighting system, a design scheme of mine intelligent lighting system based on Internet of Things for perception mine was proposed, system architecture was given, and node of wireless sensing subnet and implementation process of system control were introduced. The system can distinguish the target and set up lighting state independently according to the moving target location and tag number, so as to achieve energy saving effect. At the same time, the state information of all nodes in the network was uploaded to the ground monitoring center, so as to easy to control and maintain. When people is in distress, the system also can be used as emergency indicator system, and has function of avoiding risk.

A coal mine monitoring and control system based on dual network architecture

WANG Gang, FU Lihua, PANG Jianli

2014, 40(1): 12-15. doi: 10.13272/j.issn.1671-251x.2014.01.004

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

Abstract:
In view of situation of complexity of coal mine environment and a wide variety of testing nodes and parameters, a coal mine monitoring and control system based on dual network architecture was proposed. According to different monitored objects, the system uses different networks for data transmission, video streaming data uses Ethernet to transmit, mine environment monitoring data adopts CAN network to transmit. Moreover, the dual networks share the same physical line. The system has some advantages, such as the uniform testing and overall networking of all monitored objects, high network utilization and so on.

Design of visible light communication system used in underground coal mine

MA Xiuping, LIU Wei, ZHANG Shen, ZHAI Yanrong, HUANG Hua

2014, 40(1): 16-19. doi: 10.13272/j.issn.1671-251x.2014.01.005

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

Abstract:
In order to solve problems that wired network is easy to be destroyed and wireless network has bad communication quality existed in current communication network in underground coal mine, a LED visible light communication system was designed. The system uses existing lighting power line as transmission medium, establishes communication network covering roadway and working face through transforming the LED lighting system, and establishing a visible light communication base station, combining with the miner's mobile nodes, so as to realize dual functions of illumination and communication. Compared with existing communication system, the visible light communication system has not natural light interference and electromagnetic interference, so it has obvious advantages over security, reliability and stability. Furthermore, for its low cost, the system has high practical value in underground coal mine.

Design of mine ventilation and dedusting experiment device and PLC monitoring and control system

HUANG Shouyuan, JIA Anmin

2014, 40(1): 19-22. doi: 10.13272/j.issn.1671-251x.2014.01.006

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

Abstract:
Based on ventilation environment of laboratory, a set of mine ventilation and dedusting experiment device and PLC monitoring and control system was designed. The ventilation and dedusting experiment device integrates ventilation and dedusting, which can automatically monitor performance parameters of the air volume, air pressure, air resistance of ventilator and dedusting device; PLC monitoring and control system can realize remote or local starting and stopping, frequency-conversion speed-regulation control for ventilator and dust collector, and can real-timely monitor running state, running current and operating frequency. The PLC monitoring and control system also can simulate and implement remote computer centralized control of mine ventilation system. The practical application shows that the system runs stably and reliably, has simple operation and strong scalability.

Research of integrated automation system for southern coal mines

WU Bin, LUO Jian, HUANG Huaicai

2014, 40(1): 23-26. doi: 10.13272/j.issn.1671-251x.2014.01.007

<Abstract>(65) <PDF>(2)

Abstract:
The southern coal mines are characterized by wide distribution, a large quantity, small-sized single coal mine and complicated surroundings with the management mode of three layers structure of company-mine-underground. For these characteristics, an integrated automation system which is suitable for southern coal mines was developed. The technology system structure, system functions and integration technology of software development of the system were introduced. The system uses OPC interface technology to solve problems of interconnection and access between hardware devices, and adopts XML middleware to solve problems of accessing to data information and unifying interfaces in the heterogeneous databases. The actual application shows that the system improves production efficiency, reduces potential safety hazard, and saves cost of production.

Design of networked remote control testing system for shearer

LIN Fuyan, LI Jun, HAN Yunlong

2014, 40(1): 27-30. doi: 10.13272/j.issn.1671-251x.2014.01.008

<Abstract>(31) <PDF>(4)

Abstract:
Due to high cost and difficulty to research remote control system for shearer on actual working face, the paper proposed a design scheme of networked remote control testing system for shearer, researched internal control structure of shearer met testing requirements, and introduced design of on-board controller and wireless transceiver controller of shearer, control softwares for ground host and underground host. The system adopts a remote/local control mode to build a network of the remote control system for shearer, and transmits control signal by Ethernet, fiber, RS485 bus and wireless network, realizes remote/local control of shearer action on ground host and underground host. In addition, the testing system also provides an experimental platform for further research of remote control for shearer.

Design of pressure monitoring system of underground hydraulic support based on ZigBee technology

ZHAO Duan, ZONG Xi

2014, 40(1): 31-34. doi: 10.13272/j.issn.1671-251x.2014.01.009

<Abstract>(52) <PDF>(3)

Abstract:
In view of underground complex working environment, wiring complexity and low reliability of data transmission existed in wired pressure monitoring system of hydraulic support，a design scheme of pressure monitoring system of underground hydraulic support based on ZigBee technology was proposed. The system takes CC2530 chip as core, and achieves functions of pressure data acquisition, storage, transmission, analysis and display of anterior column, posterior column and beam of hydraulic support by wireless nodes.

Development of infrared sulfur analyzer with dual channels pyroelectric sensor

MA Lingyun, XIE Minghua, LIU Hui

2014, 40(1): 34-37. doi: 10.13272/j.issn.1671-251x.2014.01.010

<Abstract>(12) <PDF>(2)

Abstract:
In view of problems of tedious and time-consuming operation, poor security and serious pollution existed in current sulfur analysis methods, an infrared sulfur analyzer with dual channels was designed. The working principle, structure, designs of hardware circuit and infrared analysis pool of the analyzer were introduced. The analyzer is based on spectrum infrared absorption theory and uses dual channels thin film pyroelectric detectors to detect sulfur content of coal, ore and other substances quickly and accurately. The analyzer has many advantages, such as simple operation, fast analysis and high sensitivity.

Analysis and discussion on testing methods of broken rock zone of surrounding rock of roadway

CAI Guannan, LI Zhonghui, YANG Yulong, KANG Junliang

2014, 40(1): 38-41. doi: 10.13272/j.issn.1671-251x.2014.01.011

<Abstract>(32) <PDF>(2)

Abstract:
The paper introduced different testing methods and testing theories for broken rock zone of surrounding rock of roadway, discussed and analyzed advantages and disadvantages and scope of application of the different testing methods. By comparison, it got conclusion as follows: technology of the acoustic method is advanced and testing method is simple, but it is difficult to be applied in soft rock; the multi-point displacement measurement and the multi-point stress measurement can be applied for real-time monitoring of surrounding rock displacement or stress, but the accuracy of measurement is limited; the seismic wave method has high testing precision, but its equipment is expensive and complicated to install; the geologic radar method without drilling is a non-destructive testing method, but testing cost is high; the resistivity method has a high requirement in the precision of instrument and arrangement of electrodes; image resolution of the method of borehole camera is limited by harsh environmental conditions within the borehole and the pixel of camera. Therefore, each testing method has its limitations, nature of the surrounding rock should be considered in actual application to select appropriate method for accurate determination of broken rock zone of the roadway.

Research of algorithm of walking track for underground personnel

ZHANG Xuan, LI Chonggui, YANG Fa

2014, 40(1): 42-45. doi: 10.13272/j.issn.1671-251x.2014.01.012

<Abstract>(17) <PDF>(2)

Abstract:
For problems that current coal mine personnel positioning system adopts region positioning method, and cannot directly determine exact location and movement direction of underground personnel, an algorithm based on tree structure was proposed, which uses topological relations to calculate track that underground personnel may walk. The algorithm defines a topology model with point and segment, segment and segment as well as segment and point. Based on the model, tree structure is built and personnel walking track is got by its hierarchy traversal. In the calculation process, the algorithm uses real-time status information of receiver to preclude impact of non-working receiver and substations automatically, and ensures tracking accuracy.

Research of OFDM communication algorithm of low-voltage power line in coal mine

WEI Shaoliang, LIU Dahai, CHANG Ying, WANG Xuehui, ZHOU Guangping

2014, 40(1): 46-49. doi: 10.13272/j.issn.1671-251x.2014.01.013

<Abstract>(42) <PDF>(3)

Abstract:
In view of problem that traditional OFDM algorithm based on discrete Fourier transform used in underground low-voltage power lines is prone to produce larger ISI and ICI to influence normal receiving of signal, an OFDM communication algorithm based on wavelet transform was proposed. The algorithm selects Daubechies wavelet function as orthogonal wavelet basis, uses MATTAL algorithm to decompose and reconstruct wavelet, and gets channel output functions. The simulation result shows that the OFDM algorithm based on wavelet transform can reduce ISI and ICI in application of low-voltage power line communication, and improve communication quality.

Application research of wavelet threshold noise reduction in coal mine voice communicatio

ZHANG Miaofei, ZHANG Jianying, XU Changsheng

2014, 40(1): 50-54. doi: 10.13272/j.issn.1671-251x.2014.01.014

<Abstract>(9) <PDF>(4)

Abstract:
According to characteristics of high-noise environment in underground coal mine, the paper put forward a new method which adds a wavelet threshold noise reduction module to voice communication terminals. The method improves soft and hard threshold of wavelet threshold noise reduction method, and constructs a new threshold function. The new function varies through a variable between soft and hard wavelet threshold function, so as to reduce the negative impact. The theoretical analysis results show that the application of wavelet threshold noise reduction can significantly improve quality of phone call and coal mine voice communication system.

Evaluation model of information service capability of coal enterprise

ZHU Zheju

2014, 40(1): 54-58. doi: 10.13272/j.issn.1671-251x.2014.01.015

<Abstract>(21) <PDF>(2)

Abstract:
According to characteristics of information services of coal enterprise, an information services capability index system was constructed using method of functional groups, which includes information resources, information services infrastructure, information service satisfaction, information service mode and information services result. The information service capability evaluation model based on fuzzy neural network was proposed. The model can evaluate the information service capabilities of coal enterprise information services platform objectively, which has advantages such as simple operation, fast calculation, self-learning and so on.

Design and simulation of digital down conversion system based on Simulink

FAN Yaping, WANG Xiaoying, LI Shiyin, DENG Chao

2014, 40(1): 59-62. doi: 10.13272/j.issn.1671-251x.2014.01.016

<Abstract>(38) <PDF>(5)

Abstract:
In view of problem that low-pass decimation filter has big passband distortion and serious resource consumption in existing digital down conversion system, a digital down conversion system based on Simulink was designed adopting sharpening technique and interpolated second-order polynomial interpolation compensation filter, and system model was built by Simulink. The simulation results show that the system not only can reduce frequency and rate of signal, but also can effectively improve characteristics of decimation filter passband and stopband, and reduce workload of the system.

A method of feature selection based on projectio

ZHANG Hanwen, LIU Jian, ZHANG Miaotian, MENG Guoying

2014, 40(1): 63-67. doi: 10.13272/j.issn.1671-251x.2014.01.017

<Abstract>(26) <PDF>(3)

Abstract:
Taking fault diagnosis for bearing as application background, a method of feature selection based on projection was proposed on basis that low-dimensional projection can reflect some features of high-dimensional data. The method uses genetic algorithm to search the projection direction which can reflect classificatory characteristics of samples, and removes those features which unrelated to the projection by the projection direction. The method overcomes some shortcomings of complex calculations of conventional methods, and avoids “the curse of dimensionality” effectively. The simulation result shows that the method can improve efficiency and accuracy of classification by decreasing the dimension of the data without reducing the classificatory characteristics.

Reactive power control system based on magnetically controlled reactor

CHEN Xi, ZHOU Fengxing, XU Hao

2014, 40(1): 67-71. doi: 10.13272/j.issn.1671-251x.2014.01.018

<Abstract>(32) <PDF>(3)

Abstract:
In order to solve problems of fluctuation of voltage and low power factor caused by imbalance of reactive power of power grid, a kind of reactive power control system based on magnetically controlled reactor was designed. The system uses multi-variable control strategy, and can accomplish regulation of power factor, reactive power as well as voltage of busbar by controlling output reactive power of magnetically controlled reactor. The experiment result proves that the multi-variable control strategy can be applied to target parameter control effectively, and achieves expectant effect.

Application of improved equivalent sliding mode controller in vector control system of asynchronous motor

MIAO Jinli, YU Xiang

2014, 40(1): 72-75. doi: 10.13272/j.issn.1671-251x.2014.01.019

<Abstract>(27) <PDF>(2)

Abstract:
In view of problems of big stable state error, large chattering and poor tracking speed existed in conventional equivalent sliding mode controller in vector control system of asynchronous motor, an improved equivalent sliding mode controller was designed. The controller uses improved switching control function to improve dynamic control performance of the motor. The simulation results show that the improved controller can effectively reduce buffeting, improve dynamic response speed and enhance the robustness of the system compared with the conventional PI controller and conventional equivalent sliding mode controller.

Optimization research on carrier phase-shifting modulation method of cascade multi-level inverter

ZHENG Zheng, YAN Fei, ZOU Jin

2014, 40(1): 75-79. doi: 10.13272/j.issn.1671-251x.2014.01.020

<Abstract>(40) <PDF>(4)

Abstract:
The traditional carrier phase-shifting modulation method of cascade high-voltage inverter has the problems of large switching loss and low utilization rate of DC voltage, and modulation method based on combination of carrier phase-shifting and vector control has problems of large calculated amount, complex computation and difficult to achieve. In allusion to the problems mentioned above, an optimization control method of cascade multi-level inverter was proposed, namely zero-sequence component method of modulation signal and two-phase control method. The method uses idea of freedom degrees of combination control, and can improve DC voltage utilization rate and reduce the switching losses through injecting zero sequence component and DC component to modulation wave. The simulation result shows that the method is feasible.

Design of detection system of solenoid magnetic induction for broken steel wire rope

PENG Tingting, ZHOU Yiren

2014, 40(1): 80-83. doi: 10.13272/j.issn.1671-251x.2014.01.021

<Abstract>(42) <PDF>(4)

Abstract:
In view of problems of low efficiency, serious wasting cost and poor safety of existing steel rope damage detection methods which using artificial method to inspect and regularly replacing steel rope, a detection system of solenoid magnetic induction for broken steel wire rope was designed. The detection theory of the system is: when broken wire occurs, the permeability will be reduced accordingly, reluctance increases, and the inductance decreases, and then induced electromotive force will be generated because of the imbalance magnetic field of coil. According to the induced electromotive force, the situation of broken wires can be determined. The experiment results show that the system overcomes defects that traditional electromagnetic detection technology cannot accurately detect internal broken wire rope, and accuracy can reach above 95%.

Design and application of automation control system of fully mechanized coal mining face

SUN Bingke, HE Yonghua

2014, 40(1): 84-86. doi: 10.13272/j.issn.1671-251x.2014.01.022

<Abstract>(21) <PDF>(5)

Abstract:
In view of problem of low efficiency of automation coal mining on fully mechanized coal mining face, a design scheme of automation control system of fully mechanized coal mining face was proposed, composition and functions of the system were introduced. The system can control equipments of coal mining face centrally, and can real-timely monitor main fully mechanized coal mining equipments by video monitoring system.

Design of Web publishing system of monitor screen based on Proficy Portal

WANG Jianmiao, MA Lei

2014, 40(1): 87-89. doi: 10.13272/j.issn.1671-251x.2014.01.023

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

Abstract:
In view of present situation that monitoring and control system in a coal preparation plant has't remote publishing function, a design scheme of Web publishing system of monitor screen based on Proficy Portal was put forward. The system adopts C/S framework, and uses Proficy Portal to publish real time monitoring pictures and data to the Internet quickly, and realizes remote monitoring and control of field equipments.

Design of mine pressure acquisition gateway based on Cortex M3

GUO Hua, YU Shengwen

2014, 40(1): 89-92. doi: 10.13272/j.issn.1671-251x.2014.01.024

<Abstract>(46) <PDF>(2)

Abstract:
According to functional requirements of intelligent gateway in smart distributed network data acquisition system of hydraulic support, a design scheme of real-time gateway based on Cortex M3 was proposed, and designs of hardware and software of the gateway were introduced. The gateway realizes batch sampling of pressure data through RS485 or CAN bus, can upload data to the remote upper computer through Ethernet or Modem, and can offline backup massive sampled data using a SD card. The experiment result shows that the gateway has advantages of low cost, simple structure and high stability and reliability.

Application of PLC soft redundancy in monitoring and control system for ventilator

WANG Qianjin, MA Xiaoping, ZHANG Shoutia

2014, 40(1): 93-96. doi: 10.13272/j.issn.1671-251x.2014.01.025

<Abstract>(25) <PDF>(3)

Abstract:
In view of safety problem existed in monitoring and control system for ventilator that uses a single PLC to control operation, a scheme of software redundancy composed by two PLCs was proposed in the paper. One PLC is used as master station, controls the ventilator control system, and carries out non-redundant program which does not need data synchronization process and completes redundancy program of control functions, alarm, analog; and the other PLC is used as reserve station to perform only non-redundancy program. The application of PLC software redundancy system improves reliability of monitoring and control system for ventilator, and meets needs of safety production.

Design of 3D vertical plumb line coordinator based on CCD

ZHOU Liangping, WANG Wenhua, XU Lenian

2014, 40(1): 97-100. doi: 10.13272/j.issn.1671-251x.2014.01.026

<Abstract>(28) <PDF>(2)

Abstract:
In order to solve the problem that existing vertical plumb line coordinator can only measure displacement change in one direction, a 3D vertical plumb line coordinator based on CCD was designed. Composition and measurement method of the instrument were given, and circuits of parallel light source and CCD timing drive based on CPLD were introduced in details. The experiment result shows that the instrument is stable, fast and convenient for data processing, so as to realize accurate measurement of horizontal and vertical displacements caused by the deformation of mine shaft.

Application of CAN bus in underground logger

LI Meng, GUO Jiahu, ZHOU Yang, ZHOU Qi

2014, 40(1): 101-104. doi: 10.13272/j.issn.1671-251x.2014.01.027

<Abstract>(20) <PDF>(2)

Abstract:
On the basis of analysis of principle and application of CAN protocol，the paper designed a new CAN bus application layer protocol according to specific working requirements of logger. The application layer protocol was used to underground logger. On the basis of agreement CAN2.0, the protocol refers CANopen protocol specification to redefine the identifier and construct a new type of CAN bus network mechanism accommodated multi-node, so as to realize networked synchronous communication between nodes of monitoring tube and upper computer.

Design of power supply circuit of explosion-proof lithium ion battery

ZHU Qianwei

2014, 40(1): 105-108. doi: 10.13272/j.issn.1671-251x.2014.01.028

<Abstract>(15) <PDF>(8)

Abstract:
For coal mine demand of explosion-proof lithium ion battery, a kind of power supply circuit of explosion-proof lithium ion battery was designed, composition and functions of the circuit were introduced in details. The circuit uses flame-proof cavity design, when the lithium ion battery units or battery management system happen failure, the charging control system and discharging control system can quickly and reliably disconnect with the lithium ion battery, so as to ensure safety of other equipments. The circuit has functions of charge and discharge protection, voltage balance protection, over temperature protection and real-time display.

Application of electronic belt weigher in weighing of backfilled bulk gravel in vertical shaft

HU Hao, CHEN Silin, LIU Junpeng, LI Ying, LI Wenjie, YIN Liang

2014, 40(1): 108-110. doi: 10.13272/j.issn.1671-251x.2014.01.029

<Abstract>(14) <PDF>(2)

Abstract:
The paper introduced structure, working principle, method of installation and calibration of electronic belt weigher, and analyzed causes for error of the electronic belt weigher. Meanwhile, it also put forward methods of reducing errors in metering combined with usage experience of electronic belt weigher.

2014 Vol. 40, No. 1

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