工矿自动化

Development of running status monitoring system for hydraulic support based on dual RS485 buses

YANG Shihua, SONG Jiancheng, TIAN Muqin, XU Chunyu, DONG Gugangzhuai, YIN Weibing

2014, 40(8): 1-5. doi: 10.13272/j.issn.1671-251x.2014.08.001

<Abstract>(50) <PDF>(8)

Abstract:
To solve problem of lacking remote monitoring function of running status in existing electro-hydraulic control system for hydraulic support, a running status monitoring system for hydraulic support based on dual RS485 buses was developed. In the system, an enhanced RS485 serial communication mode is used with data transmission speed of 10 Mbit/s. Dual RS485 buses communication mode is used for collateral execution of online monitoring and remote control. Some anti-interference measures are used in hardware circuit design including opto-coupler isolation circuit, high voltage intrusion prevention circuit and fault protection circuit, which has passed surge immunity test according to GB/T 17626.5-1998. The test results in laboratory and field show that the system realizes remote and online monitoring of running status of hydraulic support with strong real-time performance and anti-interference performance.

Design of intelligent management and control system of coal transportation and sale based on Internet of things

WANG Yong

2014, 40(8): 6-9. doi: 10.13272/j.issn.1671-251x.2014.08.002

<Abstract>(82) <PDF>(6)

Abstract:
For lack of real-time tracking of vehicle speed, statistics of vehicle flow on road, strict supervision and reasonable scheduling of e-invoice system of coal transportation and sale at present, an intelligent management and control system of coal transportation and sale based on Internet of things was designed by use of technologies of radio frequency identification, machine to machine and global positioning system. Whole structure of the system was introduced in details as well as design schemes of wireless communication terminal on board, transportation and sale management platform and measuring and monitoring station. The actual application shows that the system improves management efficiency and supervision intensity, reduces vehicle congestion status and eliminates occurrence of tax evasion.

Determination of evaluation indexes of ventilation effect and their membership functions of working face with high volume fraction gas

CHENG Lei, ZHENG Xiaopeng, WANG Dongdong

2014, 40(8): 10-14. doi: 10.13272/j.issn.1671-251x.2014.08.003

<Abstract>(95) <PDF>(5)

Abstract:
Research status of evaluation method of mine ventilation system was summarized. In view of problem that existing evaluation methods were only for entire mine and unable to show ventilation condition of working face, an evaluation index system of ventilation effect of working face with high volume fraction gas was proposed. Eight evaluation indexes were gotten which could influence ventilation effect of working face directly according to investigation, including wind speed of working face, temperature of working face, humidity of working face, dust concentration of working face, ratio of supply to demand of wind volume, volume fraction of gas of working face, volume fraction of gas of top corner and volume fraction of gas of return airway. Scope of each evaluation index was given and membership function of each evaluation index was established. The system has been applied in W1301 working face of Sihe Coal Mine for evaluating ventilation effect with a result verifying rationality of the system.

Research of automatic vehicle identification and loading system

GUO Xi

2014, 40(8): 15-18. doi: 10.13272/j.issn.1671-251x.2014.08.004

<Abstract>(81) <PDF>(8)

Abstract:
In order to solve problems such as slow traffic, low efficiency and even human cheating because drivers frequently get off to submit bills and turnover control room in the process of vehicle loading of coal mine, the paper developed an automatic vehicle identification and loading system for motor transport, metering and automatic loading. The system implements functions of monitoring and management, automatic identification, continuous loading and automatic recording of transport vehicles, so as to shorten the auxiliary time of loading, and improve mine efficiency and safety degree.

Design of distributed network video recording system for coal mine

HUANG Chenghua, WANG Shichen, GUO Baowen, CHENG Deqiang

2014, 40(8): 18-21. doi: 10.13272/j.issn.1671-251x.2014.08.005

<Abstract>(76) <PDF>(5)

Abstract:
In view of phenomenon that traditional centralized network video recording system has insufficient video processing capacity of storage device and network congestion when videos involve multi-channel, large capacity and data concurrency, a distributed network video recording system was designed. The system adopts distributed IP architecture, and can realize distributed storage and centralized logic management of video data. The system also can realize control data interaction between device management and authority management and network transmission control of video streaming with application of Socket device management and playback control technology based on application layer multicast. The test results show that the system can solve problems of real-time storing and remote playback of multi-channel and large capacity video data in coal mine.

Research of evaluation algorithm for operational reliability of power grid based on distributed computing

YANG Feihu, SHI Youren

2014, 40(8): 22-25. doi: 10.13272/j.issn.1671-251x.2014.08.006

<Abstract>(30) <PDF>(5)

Abstract:
In view of problem that evaluation for operational reliability of power grid has large calculated amount, but requires short computing time, the paper proposed an evaluation algorithm for operational reliability of power grid based on distributed computing. The algorithm uses improved state selection and analysis solution to solve the relevance problem of random number sequence between computing terminals, effectively reduces communication traffic and improves computing speed. Evaluation software based on the algorithm has passed RTS-24 test system and actual operation test of a provincial power grid, and the test results show that the algorithm can effectively evaluate operational reliability of power grid, and the computing speed increases by a certain multiple with the increase of number of computing terminals.

Research of distribution law of gas concentration of double U-shape ventilation working face

LU Tao, WU Shiyue, YAN Jinwen, QIN Guicheng

2014, 40(8): 26-29. doi: 10.13272/j.issn.1671-251x.2014.08.007

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

Abstract:
In order to grasp distribution law of gas concentration of double U-shape ventilation and prevent gas exceeding problem, the paper simulated and analyzed air leakage of goaf at different positions between two crossheadings using Fluent software. It also measured and researched gas emission law on working face. The results of simulation and observation show that changes of the gas concentration of the rear scraper conveyor of the working face, the upper concern and rear return airway are small in the process of advancing the working face; the gas concentrations of tailing way have a big change with the change of position of the working face between the two crossheadings. The gas concentration of the tailing way will be the maximum when the crossheadings are opened, it reaches the minimum when the distance between working face and the opened crossheading is 23 meters, reaches the maximum when the distance is 40 meters, and further increase with the distance increasing. Therefore, the reasonable distance of the crossheadings between return airway and gas drainage way is 40 meters from the perspective of gas controlling, and the distance should be no larger than 50 meters from the economic perspecitve.

Research of influence factors on characteristic parameters of coal dust explosio

LIU Zhentang, GUO Rulin, XI Runze

2014, 40(8): 30-33. doi: 10.13272/j.issn.1671-251x.2014.08.008

<Abstract>(77) <PDF>(5)

Abstract:
Influence of particle size, concentration and ignition energy of coal dust on the maximum pressure and its rising rate of coal dust explosion were researched by use of 20 L spherical explosion equipment. The research results show that under the condition of certain particle size of coal dust, the maximum pressure and its rising rate of coal dust explosion will increase firstly and then decrease along with increasing of concentration of coal dust. When concentration of coal dust is in 400-480 g/m3, the maximum pressure and its rising rate of coal dust explosion achieve the maximal value of 0.94 MPa and maximum 28.79 MPa/s respectively. Under the condition of certain concentration of coal dust, the maximum pressure of coal dust explosion will not change in a similar tendency and its rising rate will increase along monotone with decreasing of particle size of coal dust. The maximum pressure and its rising rate of coal dust explosion will increase significantly along with increasing of ignition energy.

System dynamics modeling and demonstration of safety level of production logistics of coal mine

WANG Jinfeng, ZHANG Bo, FENG Lijie, ZHAI Xueqi

2014, 40(8): 34-38. doi: 10.13272/j.issn.1671-251x.2014.08.009

<Abstract>(35) <PDF>(3)

Abstract:
In view of problem of strong subjective element in determination of index weight of safety level of production logistics of coal mine, entropy weight method was used to determine index weight of safety level, system dynamics approach was applied for dynamic simulation of factors affecting safety level, and incidences of various factors affecting safety level of production logistics of coal mine were contrasted and analyzed. The simulation results show that degree of mechanization and roadway environment have the maximum practical activity ratio, therefore, improve degree of mechanization and strengthen the safety level of the roadway environment are the keys to improve safety level of production logistics of coal mine.

MTPA-DTC efficiency optimization method for feeding system of pressure filter

ZHANG Ka, FANG Lei, CAO Xiaodong

2014, 40(8): 39-42. doi: 10.13272/j.issn.1671-251x.2014.08.010

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

Abstract:
In order to improve actual operation efficiency of feeding system of pressure filter, an efficiency optimization method with the maximum torque per ampere applied in direct torque control was proposed. The method adjusts amplitude of stator flux linkage dynamically based on actual changing of electromagnetic torque, so as to achieve the maximum torque output under unit current amplitude. The experimental results show that the method can realize efficiency optimization of the system in the whole load range with smaller stator current under the same electromagnetic torque.

Image denoising of coal dust based on fractional calculus adaptive algorithm

WANG Zheng, MA Xianmi

2014, 40(8): 43-46. doi: 10.13272/j.issn.1671-251x.2014.08.011

<Abstract>(34) <PDF>(2)

Abstract:
In view of problem of long iteration process, unsatisfactory image denoising effect and poor texture retention capacity of traditional denoising method of coal dust image, the paper improved existing method and built an adaptive denoising algorithm based on fractional calculus model. The improved algorithm adjusts gradient of fractional order u from integer order to fractional order, and makes model parameters vary adaptively according to regional characteristics. The experimental results show that the improved denoising algorithm has fast convergence, fewer iterations, good denoising effect, and strong texture retention ability, while its quantitative indicators to measure noise effect are improved.

Design of interleaved three-winding coupling Buck converter

ZHANG Peiyan, YU Zetong

2014, 40(8): 46-49. doi: 10.13272/j.issn.1671-251x.2014.08.012

<Abstract>(62) <PDF>(12)

Abstract:
In view of problem of small duty cycle existed in traditional interleaved Buck converter, an interleaved three-winding coupling Buck converter was designed by introducing three-winding coupling inductance into flyback converter. Voltage stress of switching tube and output diode of the converter were analyzed, then output voltage gain of the converter was achieved, and topology of the converter was optimized. The simulation and experiment results show that the optimized topology can suppress voltage fluctuation between both ends of switching tube effectively and reduce voltage stress of switching tube.

An improved method of direct torque control of induction motor

LU Bingjuan, JI Xuande, GE Yunwang

2014, 40(8): 49-53. doi: 10.13272/j.issn.1671-251x.2014.08.013

<Abstract>(47) <PDF>(2)

Abstract:
In view of shortcomings of traditional direct torque control method of induction motor that torque and flux linkage have large pulsation and switching frequency is unfixed, the paper put forward an improved direct torque control method with space vector modulation for induction motor. The method uses torque-angle closed-loop control to achieve decoupling of flux linkage magnitude and phase of stator, so as to obtain reference voltage space vector and realize control of flux error and torque error. The simulation results show that the method can effectively overcome the shortcomings of traditional direct torque control method, and get good dynamic response performance.

Research of mutual inductance voltage between stators of six-phase induction motor

NIU Lianbo, FU Huikai, AI Yongle

2014, 40(8): 54-56. doi: 10.13272/j.issn.1671-251x.2014.08.014

<Abstract>(30) <PDF>(2)

Abstract:
Theoretical calculation and finite element analysis of coefficients of transient self-inductance and mutual inductance between stators and mutual voltage were carried out when trapezoidal wave phase current was input to six-phase induction motor. The calculation and analysis results show that six-phase induction motor whose stator side inputting trapezoidal wave can simulate control mode of DC motor; Torque current has very little impact on induced voltage of each phase of the stator, which verifies reasonableness of ignoring magnetic effect generated by stator torque current and rotor current during modeling and simulation.

Multiple model predictive control of robot manipulator

DU Jingjing, HU Junchao, SHANGGUAN Xuanfeng

2014, 40(8): 57-62. doi: 10.13272/j.issn.1671-251x.2014.08.015

<Abstract>(40) <PDF>(2)

Abstract:
A multiple model predictive control method based on membership function was proposed according to nonlinear characteristics of robot manipulator. An appropriate scheduling variable was selected according to the characteristics of the robot manipulator. The operation space of the robot manipulator was divided into several subspaces, the robot manipulator was linearized at equilibrium point in each subspace, and linear sub-models were built in each subspace, and the multiple model presentation of the robot manipulator was developed. Then, local predictive controllers were designed according to each linear sub-model, and make it satisfy with control requirements in the subspace. Finally, the local predictive controllers were combined by trapezoidal membership functions into a global multiple model predictive controller to control the robot manipulator. The simulation results show that the control performance of the global multiple model predictive controller based on the membership functions is superior to conventional PD controller when the robot manipulator was working in a wide operating range, so as to realize the desired control goal.

An improved unicast retransmission scheme based on network coding

QIU Sha, LI Shiyin, LI Zongya

2014, 40(8): 62-66. doi: 10.13272/j.issn.1671-251x.2014.08.016

<Abstract>(23) <PDF>(3)

Abstract:
In view of problems such as low efficiency and low spectrum efficiency existed in wireless unicast retransmission, an improved unicast retransmission scheme based on network coding was proposed. The basic principle of the scheme is that transmitting terminal encodes initial incorrect transmission data packet and new data packet by different rate respectively in retransmission stage, combines the data packets, and transmitting terminal sends the hybrid information to the corresponding receiver. The receiver uses soft combining method to combine the retransmitted data packet with the initial packet during the previous transmission stage and then makes a decoding process in order to recover the original information, at the same time, the combined two packets will share energy, space and time in the retransmission process. The simulation results show that performance of error bit rate of the proposed scheme is lower than the traditional automatic repeat request scheme, and the proposed scheme improves transmission efficiency of wireless unicast link effectively.

Intrusion detection system for denial of service attack in MAC layer

LUO Shangping

2014, 40(8): 67-71. doi: 10.13272/j.issn.1671-251x.2014.08.017

<Abstract>(36) <PDF>(3)

Abstract:
For insufficient of safety protection means and characteristics of denial of service attack in MAC layer of WLAN, the paper designed an intrusion detection system based on support vector machine. The system uses characteristics of high classification accuracy of support vector machine to build hyper-plane of optimal classification and classification decision function, and achieves classification and identification of network traffic, and completes detection of abnormal traffic. The intrusion detection of WLAN was simulated on OPNET platform, and the result indicates that the system can detect denial of service attack in MAC layer efficiently.

Design of Internet of things of coal mine and its application analysis

DING Congshi, WANG Wei

2014, 40(8): 72-74. doi: 10.13272/j.issn.1671-251x.2014.08.018

<Abstract>(45) <PDF>(3)

Abstract:
Design schemes of sensing layer, network layer and application layer of Internet of things of coal mine were introduced. Key technologies were pointed out in establishment of Internet of things of coal mine and corresponding solutions were proposed including identification system of Internet of things, integrated communication base station, distributed sensing technology of underground and interconnection and communication of heterogeneous networks. Specific applications of Internet of things of coal mine were analyzed in aspects of safety production and management, integrated multimedia communication, supervision of mine-used equipment and material, etc.

Construction idea of multi-level scheduling informatization platform of coal mine enterprise group corporatio

ZHANG Jiyua

2014, 40(8): 75-77. doi: 10.13272/j.issn.1671-251x.2014.08.019

<Abstract>(47) <PDF>(2)

Abstract:
A construction idea of multi-level scheduling informatization platform of coal mine enterprise group corporation was expounded from level responsibility, function orientation and constructing content combing with existing status of three level scheduling and management system for safety production of Jizhong Energy Group. Construction of the platform could make each scheduling and management level of safety production quickly obtain operation data of safety production in working field, integrate all kinds of business data on a cooperative informatization platform and realize information sharing and effictive utilization in or out of enterprise.

Development of ZYBG type automatic explosion suppression device of mine-used gas transmission pipeline

RONG Jia, HU Shuangqi, ZHOU Wen, TIAN Danqing

2014, 40(8): 78-81. doi: 10.13272/j.issn.1671-251x.2014.08.020

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

Abstract:
ZYBG type automatic explosion suppression device of mine-used gas transmission pipeline was developed by use of active explosion suppression technology in order to guarantee safety of the gas transmission pipeline. The device adopts flame sensor to detect gas explosion signal, transmits the signal to controller through photoelectric conversion, and controller makes determination and analysis for the signal. In the moment of explosion closes to the protection range, the controller opens high pressure explosion suppressor quickly and release explosion suppression medium to extinguish the flame, so as to prevent further spread of the explosion. The test results of explosion suppression performance show that the explosion suppression device can capture flame information within 5 ms, and sprinkle explosion suppression medium within 35 ms.

Software optimization method of CAN communication network for mine-used new energy electric locomotive

XIAO Linjing, YUE Mingchen, LI Hongyu, WENG Feng, YU Pengjie

2014, 40(8): 82-84. doi: 10.13272/j.issn.1671-251x.2014.08.021

<Abstract>(24) <PDF>(2)

Abstract:
In order to avoid missing key message caused by sending fault of CAN node in mine-used new energy electric locomotive, a sending fault tolerant method of CAN bus based on TTCAN protocol was proposed, that is, message sent unsuccessfully by CAN node will be resent until the message is sent successfully or resending times reach the maximum resending times. At the same time, a high-efficient receiving and processing message method of CAN bus was proposed. Message is cached during interrupt receiving message, meanwhile, amount of received message is modified, and message in cache is processed by main program based on the modified amount, which realizes time-sharing operation between receiving and processing of message. The test results show that the optimization method can improve real-time ability and reliability of CAN bus communication effectively, decrease working time of CPU in each CAN node and improve working efficiency.

Application of gas drainage technology with separated sources in steep thick seam

CHEN Xinrun, HOU Tiejun, ZHAO Yunfeng

2014, 40(8): 85-87. doi: 10.13272/j.issn.1671-251x.2014.08.022

<Abstract>(41) <PDF>(4)

Abstract:
In order to solve problems of gas overrunning in No.735 Coal Mining Face of Dahuangshan Mine, a gas drainage technology with separated sources was put forward based on analysis of main sources of gas emission of the coal mining face, that is, gas in goaf is drainaged directly through crossing borehole by optimizing drainage pipelines, so as to realize gas drainage in goaf and mining seam separately. The application results show that gas volume fraction in air return flow is 0.36%-0.46%, gas volume fraction in upper corner is 0.4%-0.6%, and gas drainage average rate is 59.17% after the gas drainage conducted with separated sources.

Measurement of effective radius of gas drainage of bedding drill hole in low permeability coal seam

WANG Xing, WANG Fei, LIU Xiang, HAO Yabing

2014, 40(8): 88-91. doi: 10.13272/j.issn.1671-251x.2014.08.023

<Abstract>(48) <PDF>(2)

Abstract:
In view of low permeability characteristics of No.3 coal seam in Changping Coal Mine, the effective radius of gas drainage of bedding drill hole was measured and analyzed by improving sealing process with polyurethane-expansive cement and use of hole pressure method, and determined effective radius of gas drainage of bedding drill hole of No.3 coal seam of Changping Coal Mine is 2.5 meters. It avoids the phenomenon of empty gas drainage area, string holes and hole collapse in gas drainage process, and provides an important basis for reasonable arrangement of gas drainage drill hole.

Application of extrinsic F-P sensor in gas detection system

DAI Hua, ZHOU Mengran, WANG Bo, XU Yandong, FU Xueqiang

2014, 40(8): 91-94. doi: 10.13272/j.issn.1671-251x.2014.08.024

<Abstract>(36) <PDF>(2)

Abstract:
The structure, characteristics and working principle of extrinsic F-P sensor were introduced in details, and application of the extrinsic F-P sensor in gas detection system was expounded. The sensor takes hollow core photonic crystal fiber as isotopic carrier, is not affected by environmental temperature, which has characteristics such as high sensitivity, strong anti-jamming capability and low transmission loss, and can significantly improve accuracy and precision of gas concentration detection.

Application of TD-SCDMA wireless communication system in coal mine

WEI Qidong, SHANG Xiaolong, ZHANG Jingyu

2014, 40(8): 94-96. doi: 10.13272/j.issn.1671-251x.2014.08.025

<Abstract>(35) <PDF>(3)

Abstract:
Whole design scheme of TD-SCDMA wireless communication system was introduced as well as concrete equipment and application condition of the system in Huating Coal Mine. The system realizes communication between underground moving worker and dispatcher on the ground by coordinating with wired scheduling and communication system, and accurate location of undergroud worker by use of TA wireless location technology with location information on interface of upper computer.

Data analysis system for coal special fund based on OLAP technology

WANG Sheguo, ZHANG Feng, TIAN Zhimin, WU Shasha

2014, 40(8): 97-99. doi: 10.13272/j.issn.1671-251x.2014.08.026

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

Abstract:
In view of problem of inadequate function of data integration and analysis of special fund of coal enterprise, a data analysis system for coal special fund based on OLAP technology was designed. The system uses HOLAP hybrid structure to realize physical storage of data, uses snowflake schema to organize data of fact table and dimension table, and loads the data into multidimensional data set after ETL processing for the data. Eventually, the system uses OLAP multidimensional analysis technology to realize data analysis function and good user interaction, so as to meet needs of dada analysis of special fund and provide necessary support for enterprise decision.

Analysis of order degree and flexibility degree of coal mine emergency rescue organization structure

MENG Fance, ZHANG Junbo

2014, 40(8): 100-103. doi: 10.13272/j.issn.1671-251x.2014.08.027

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

Abstract:
For lack of quantitative analysis method for current coal mine emergency rescue organization structure, order degree of organization structure was defined from timeliness and quality of information transmission, and flexibility degree of organization structure was calculated by use of variation entropy based on analysis of characteristics of coal mine emergency rescue organization and entropy theory, then models of order degree and flexibility degree of coal mine emergency rescue organization structure were established. The application results show that accurate analysis of coal mine emergency rescue organization structure can be realized through order degree and flexibility degree.

Design of test device of comprehensive performance of electromagnetic pilot valve with small flow

ZHAI Jing

2014, 40(8): 104-106. doi: 10.13272/j.issn.1671-251x.2014.08.028

<Abstract>(35) <PDF>(4)

Abstract:
The paper introduced design of a test device of comprehensive performance of electromagnetic pilot valve with small flow and its working principle. The device can realize test of the electromagnetic pilot valve separately. It uses energy accumulator as power source to conduct dynamic load test, so as to reduce energy consumption. It can realize tests of multiple electromagnetic pilot valves with different types at the same time through connecting valve plates, so as to improve working efficiency. And it can realize test of electrical and hydraulic indexes by using one test device, so as to reduce test steps.

Design of automatic energy-saving control system of cooling water of evaporative condenser

SHI Hongwei

2014, 40(8): 107-109. doi: 10.13272/j.issn.1671-251x.2014.08.029

<Abstract>(38) <PDF>(2)

Abstract:
For current status that cooling water system of evaporative condenser uses manual control in mine construction utilizing freezing method, an automatic energy-saving control system of cooling water of evaporative condenser was designed in order to simplify process and improve efficiency. In the system, cooling water level of evaporative condenser is converted into electrical signal by use of ball float level controller for controlling circulating pump through contactors, intermediate relays and other low-voltage electrical apparatus, so as to realize automatic circulation of cooling water of evaporative condenser. Cooling tower in total water storage tank and operation mode of the system are controlled by use of temperature controller through detecting temperature of cooling water, so as to ensure safe, high-efficient and energy-saving operation of refrigeration system in construction utilizing freezing method.

Research of non destructive detection system of steel rope core based on X-ray

JI Xiaohua

2014, 40(8): 110-112. doi: 10.13272/j.issn.1671-251x.2014.08.030

<Abstract>(47) <PDF>(6)

Abstract:
The paper designed a kind of non destructive detection system of steel rope core based on X-ray. The system takes advantage of good penetrability of X-ray to inspect defects of steel wire rope in belts, uses optical fiber to transmit images information collected on site to remote host computer for analysis and processing, and realizes functions of online intelligent identification and analysis of defect images of steel rope core. Prototype test results show that the system can inspect defects of cut through, puncture, joint twitching, tearing and so on, which improves inspection efficiency and accuracy under the premise of ensuring safety working of X-ray.

2014 Vol. 40, No. 8

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