工矿自动化

A coal-rock recognition method based on statistical modeling ofsteerable pyramidal decomposition coefficients

SUN Jiping, CHEN Bang

2016, 42(12): 1-5. doi: 10.13272/j.issn.1671-251x.2016.12.001

<Abstract>(54) <HTML> (13) <PDF>(6)

Abstract:
For poor universal applicability of traditional coal-rock recognition methods whose application was limited by mining techniques and coal seam conditions, a coal-rock recognition method based on statistical modeling of steerable pyramidal decomposition coefficients was presented. Firstly, multi-scale steerable pyramidal decomposition was conducted on coal and rock images. Then, asymmetric generalized Gaussian distribution was adopted as a statistical model to fit coefficients of every steerable directional subband, and parameters of the asymmetric generalized Gaussian distribution were obtained by means of the maximum-likelihood estimation. Finally, symmetric relative entropy was employed as distance metrics to complete automatic identification of coal and rock images. The experimental results show that the method has high accuracy rate of coal-rock recognition than that of existing ones, which achieves 86.90%.

Design of running status monitoring system substation of scraper conveyor

LIU Jing, LIU Zongwei, LEI Zhipeng, LIN Lingyan, SONG Jiancheng, CAO Baolin, SHI Lizhi

2016, 42(12): 6-10. doi: 10.13272/j.issn.1671-251x.2016.12.002

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Abstract:
For problems of non-comprehensive monitoring data and large volume and inconvenient installation of flameproof type monitoring equipment existed in running status monitoring system for scraper conveyor in fully mechanized working face, a running status monitoring system of scraper conveyor was developed, and software and hardware design schemes of substation of the system were introduced in details. The substation, which is composed by CPU, data acquisition module and communication module, can monitor running status of driving equipments for scraper conveyor, and diagnose load status of scraper conveyor by use of input and output speed monitoring method for torque limiter. The test result shows that the substation meets intrinsically safe requirements, and has accurate monitoring data, stable communication and reasonable and effective diagnosis method of load status.

Design of double layer resistance gird SOI strainometer and its application in coal mine

FU Dongbo, DU Taotao, SHEN Shaoqun

2016, 42(12): 10-14. doi: 10.13272/j.issn.1671-251x.2016.12.003

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Abstract:
A double layer resistance gird SOI strainometer with micro fuse structure was designed. The strainometer is produced by techniques of thermally grown oxide, photoetching and mechanical erosion. It solves problems of normal SOI strainometer which has small bulk resistor and is vulnerable to pollution, and improves precision, insulativity and working stability of the strainometer. Field test results show that mine borehole stressmeter adopting the proposed SOI strainometer has high measuring accuracy and stable and reliable performance,and is suitable for stress monitoring of coal and rock mass.

Research of automatic passageway type air regulator with full section and its applicatio

LI Wei

2016, 42(12): 15-18. doi: 10.13272/j.issn.1671-251x.2016.12.004

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Abstract:
For problems of long adjustment time and low adjustment precision of traditional air regulator, an automatic passageway air regulator with full section was developed, and accurate measurement and control principle of air section of the air regulator was introduced. The air regulator is composed of a supporting frame, a pneumatic motor, a push rod, a door body, a guide plate and a rotary encoder. Under the pressure of compressed air, the pneumatic motor rotates at high speed and drives the push rod to push the door body and the guide plate to move, so as to realize rapid adjustment of air regulator area. The rotary encoder records revolutions of the pneumatic motor. The field application shows that the maximum error of air area adjustment is 0.385%, and area adjustment time is less than 60 s.

Research status and expectation of on-line monitoring technologies of mechanical characteristics of high-voltage vacuum circuit breaker

ZHAO Yang

2016, 42(12): 19-24. doi: 10.13272/j.issn.1671-251x.2016.12.005

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Abstract:
Basic contents of on-line monitoring technologies of mechanical characteristics of high-voltage vacuum circuit breaker were introduced, and various kinds of methods of on-line monitoring were reviewed. Various analysis methods and application ranges of vibration signal were analyzed in details. The development tendency of on-line monitoring technologies of mechanical characteristics of high-voltage vacuum circuit breaker was expected.

Research of precision improving algorithm of shearer positioning based on UWB

LIU Yiming, LIU Wanli, ZHANG Boyuan, YANG Binhai

2016, 42(12): 25-30. doi: :10.13272/j.issn.1671-251x.2016.12.006

<Abstract>(126) <HTML> (16) <PDF>(16)

Abstract:
In view of problem of low precision of using UWB positioning system to obtain position coordinates of shearer, a precision improving algorithm of shearer positioning based on UWB was put forward. The algorithm uses ability of analysis of various signal values of information filter algorithm to filter UWB positioning results, and uses ability of optimal solution of neural network algorithm to evaluate positioning information during certain period when the shearer stays at the head position of scraper conveyer, in order to realize accurate shearer positioning. The experiment results show that after using information filter algorithm to process positioning results, the 3D accuracy can reach 7 cm, and after the application of neural network algorithm, the positioning accuracy can reach 2~3 cm.

A discrete firefly algorithm for solving the shortest escape path problem in-underground coal mine

ZHANG Xueying, LI Zhiyong, LI Fenglian, CHEN Guiju

2016, 42(12): 30-35. doi: 10.13272/j.issn.1671-251x.2016.12.007

<Abstract>(61) <HTML> (11) <PDF>(6)

Abstract:
A new discrete firefly algorithm was proposed to solve the shortest escape path problem in underground coal mine. Firstly, the firefly individual was initialized using transfer probability method. And then, a new efficient encoding and decoding method was proposed to redefine space distance, the maximum fluorescence intensity and fluorescence relative brightness of the firefly. So the firefly individual state can be expressed as an effective path from the starting point to the target point. In order to increase the diversity of solutions and to prevent the solutions falling into the local optimum, disturbed operation was carried out to the represented path of the firefly by a certain probability. After several iterations, the shortest path of the solution can be obtained. The experimental results show that the proposed algorithm can converge to the optimal solution with the smaller population size and less iterations than the other algorithms, and has strong convergence and flexibility, which can be used to solve any problem of the shortest path.

Determination of real-time working resistance of support in fully-mechanized working face of medium-thickness coal seam

CHEN Lei

2016, 42(12): 36-41. doi: 10.13272/j.issn.1671-251x.2016.12.008

<Abstract>(92) <HTML> (3) <PDF>(4)

Abstract:
In order to study evolution of real-time working resistance of hydraulic support with roof breaking in fully-mechanized working face of medium-thickness coal seam, a mechanical model of main roof was established based on elastic foundation beam, and law of main roof movement was analyzed. It was pointed out that breaking position of overlying strata was in front of working face, and analytical solution of pre-breaking distance was given. The roof breaking form of the initial weighting and period weighting of working face were analyzed combined with engineering practice, and calculation formulas of real-time working resistance of support during period weighting were obtained. The research results are as following. Main roof fractures twice in a single weighting cycle. Working resistance of support is a nonlinear function of suspension length of main roof before the first breaking. When the suspension length is equal to limit breaking distance, working resistance of support reaches the maximum value with main roof breaking. Before the second breaking of main roof, working resistance of support increases with working face advance distance as a quadratic function, and reaches the maximum value with main roof breaking.

An improved broadcasting algorithm for underground wireless sensor network

XIE Hong, LIU Zhenchao, WANG Daxi

2016, 42(12): 42-45. doi: 10.13272/j.issn.1671-251x.2016.12.009

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Abstract:
For problem of high energy consumption of existing broadcasting algorithm for underground wireless sensor network, an improved forward broadcasting algorithm of wireless sensor network was proposed. In the algorithm, forwarding nodes select prioritized node to forward information according to their own positions, so as to decrease redundant forwarding information and reduce energy consumption of the network. The simulation results show that when network node density achieve certain value, the algorithm can satisfy network receiving rate requirement, and limit total forwarding information, so as to reduce energy consumption of wireless sensor network effectively.

Forecasting of underground field intensity based on LS-SVM optimized by genetic algorithm

WANG Anyi, XI Xi

2016, 42(12): 46-50. doi: 10.13272/j.issn.1671-251x.2016.12.010

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Abstract:
In order to study propagation loss law of electric wave and improve prediction accuracy of field intensity coverage in mine tunnel, least square support vector machine (LS-SVM) method optimized by genetic algorithm was used to forecast underground field intensity in mine tunnel. Firstly, simulated field intensity data was generated by computer software and divided into training set and testing set. Then the LS-SVM machine method was used to study training set, genetic algorithm was used to optimize parameters of LS-SVM, and testing set was used to verify performance of the method. Finally the LS-SVM method optimized by genetic algorithm was used to forecast underground field intensity in mine tunnel. The simulation and experiment results prove that the LS-SVM optimized by genetic algorithm can effectively improve prediction accuracy of field intensity in mine tunnel, and achieve good prediction effect.

Research on soft start mode of grading discrete frequency conversion for mine asynchronous motor

WANG Dongfeng, ZHANG Kairu, WANG Yi, WANG Yongli

2016, 42(12): 50-55. doi: 10.13272/j.issn.1671-251x.2016.12.011

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Abstract:
In view of problem that traditional soft start mode of mine-used asynchronous motor has big starting current, small starting torque, and cannot achieve overload or full load start, voltage regulation circuit and protection circuit were improved based on existing grading discrete frequency conversion principle, and an improved soft start mode of grading discrete frequency conversion for mine asynchronous mator was put forward. The main voltage regulator circuit uses gate turn-off thyristor GTO instead of traditional SCR thyristor to adjust power frequency, and uses ideal switch group instead of three-phase circuit breaker to control its turn-off, so as to prevent circuit damage caused by over-voltage or over-current, and achieves purpose of circuit protect. The Matlab simulation results show that improved soft start mode of grading discrete frequency conversion can not only reduce starting current and increase starting torque, but also effectively protect the circuit.

A novel chopping current protection circuit for intrinsically safe power supply

FANG Xupeng, YU Zhixue, QIN Ming, YAN Peng, ZHAO Ke

2016, 42(12): 56-58. doi: 10.13272/j.issn.1671-251x.2016.12.012

<Abstract>(69) <HTML> (10) <PDF>(22)

Abstract:
For problems that traditional chopping current protection circuit had small cut-off current value and poor anti load impact ability, and needed additional recovery circuit or manual circuit after over-current fault, a novel chopping current protection circuit for intrinsically safe power supply was designed. The circuit adopts double parallel control structure, so as to improve reliability. The circuit can chop circuit rapidly under condition of load over flowing, and put into operation fast after fault with adjusted input point. Meanwhile, the circuit has low power consumption part, so as to reduce power loss under condition of light load or no-load. The experimental results show that the circuit can recover automatically after over-current fault with low load effect and strong load capacity.

New line selection method of resonant grounding system based on energy and correlatio

YANG Xinwei, LIU Weina, JIANG Bo

2016, 42(12): 59-63. doi: 10.13272/j.issn.1671-251x.2016.12.013

<Abstract>(30) <HTML> (6) <PDF>(5)

Abstract:
In view of problem that single line selection method of resonant grounding system prones to misjudgment and is easily affected by the training samples, new line selection method of resonant grounding system based on energy and correlation was proposed. Firstly, current mutation of each phase and comprehensive correlation coefficient of each line are calculated;then EMD algorithm is used to calculate weight coefficient of intrinsic mode energy corresponding to phase current mutation of each line, and the maximum value of weight coefficient of intrinsic mode energy of three phases in each line is taken as the comprehensive energy coefficient value of the line;finally,feature distance of each line is obtained according to the two-dimensional criterion.The simulation results show that the new line selection method of resonant grounding system based on energy and correlation achieves bus fault diagnosis, improves criterion margin in a certain extent, and has wide scope of application.

Analysis of vibration characteristics of cutting arm of EML340 continuous miner

ZHANG Yanjun, WANG Junyuan, DONG Lei, DU Wenhua, LI Yong, WANG Shengli

2016, 42(12): 63-67. doi: 10.13272/j.issn.1671-251x.2016.12.014

<Abstract>(53) <HTML> (8) <PDF>(5)

Abstract:
In order to get vibration characteristics of cutting arm of continuous miner in working condition, the optimized sensor disposition was done taking results of the modal movement energy as main reference and results of modal strain energy as auxiliary reference. Vibration acceleration signals of cutting arm were collected by the sensor, and time-domain analysis and frequency-domain analysis of the signal were done. And the distribution of vibration characteristics and frequency-band energy was obtained. It provides a theoretical basis for further optimization of structural design and fault diagnosis of continuous miner.

Analysis and recognition method of wear degree of roadheader cutting picks

SUN Ruji, WANG Shuisheng, WANG Haijian

2016, 42(12): 68-71. doi: 10.13272/j.issn.1671-251x.2016.12.015

<Abstract>(47) <HTML> (9) <PDF>(4)

Abstract:
In order to realize accurate identification of wear degree of roadheader cutting picks, an analysis and recognition method of wear degree of roadheader cutting picks was proposed. Three-direction vibration signal and current signal in cutting process of picks with different wear degree were tested and extracted. Sample evidence set for each cutting characteristic signal was established, and on-line recognition of wear degree of picks was realized by using D-S combination recognition model based on modified model. The experimental results show that the proposed method can accurately identify wear degree of picks according to multi cutting characteristic signals, and has high recognition precision and reliability, which provides important basis for determining the optimal maintenance and replacement period of picks.

Surface fault location of conveyor belt based on saliency and deep convolution neural network

ZHAO Yanfei, YANG Yanli, WANG Lijua

2016, 42(12): 72-77. doi: 10.13272/j.issn.1671-251x.2016.12.016

<Abstract>(43) <HTML> (11) <PDF>(6)

Abstract:
A surface fault location of conveyor belt based on saliency and deep convolution neural network was proposed. The method imprints figures on the edge of upper and lower surfaces of conveyor belt, and uses image processing technology to detect the number in belt image, so as to indirectly locate surface fault of the conveyor belt. Firstly, the acquired image of the conveyor belt is preprocessed by Gaussian filtering and gray-scale linear transformation to improve image quality and enhance contrast between the background and the target. Then, visual saliency treatment is conducted to the preprocessed image according to spectral residual theory, and a visual saliency map containing numeric regions is obtained. Finally, saliency map is classified by using the convolution neural network to distinguish digital region from non-digital region. The experimental results show that the method can detect number of conveyor belt image and realize surface fault location of conveyor belt.

Virtual simulation and remote control system for coal mine roadheader robot

ZHANG Xuhui, CHEN Li, MA Hongwei, MAO Qinghua, DU Yuyang, ZHAO Youjun

2016, 42(12): 78-83. doi: 10.13272/j.issn.1671-251x.2016.12.017

<Abstract>(42) <HTML> (6) <PDF>(12)

Abstract:
For problems that existing roadheader monitoring methods of video monitoring and telemetering had unclear monitoring images and cannot show pose and working conditions of roadheader, a virtual simulation and remote control system for coal mine roadheader robot was proposed. Design scheme of the system was introduced, and key technologies were researched including improvement of roadheader robot, remote control platform based on virtual reality and control model of roadheader robot. The system integrates underground miners, roadheader robot and underground environment information by use of virtual reality technology, and realizes functions of motion control of excavation process and mine roadway excavation control, which takes automatic tunneling of roadheader and remote intervention by human. The experimental result shows validity and good control performance of the system.

Production information management system of intelligent welding workshop for hydraulic support

DU Yibo, WANG Guofa, ZENG Qingliang

2016, 42(12): 83-87. doi: 10.13272/j.issn.1671-251x.2016.12.018

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Abstract:
In order to ensure intelligent welding process is suitable for production of structural member of support, improve equipment utilization rate, guarantee welding quality, and give full play to advantages of intelligent welding workshop, production information management system of intelligent welding workshop for hydraulic support based on MES was studied. The overall system model and its network architecture were established, functional requirements of the system were analyzed, and the system database model was established. The design of data acquisition module of intelligent welding workshop production information was introduced. The module realizes comprehensive collection of scene information of workshop. The practical application results show that the system realizes effective data communication between enterprise decision-making level and production site, and ensures production quality and efficiency of hydraulic support.

Research on application of ZigBee technology in PID controller parameter tuning

LIU Xianfeng, WANG Mingqian, WANG Jingsheng

2016, 42(12): 88-92. doi: 10.13272/j.issn.1671-251x.2016.12.019

<Abstract>(41) <HTML> (10) <PDF>(3)

Abstract:
In view of problem of traditional PID parameter tuning such as installation and wiring of cable are quite cumbersome,operation lacks flexibility, the paper proposed to apply ZigBee technology to PID parameter tuning. Communication between PID parameter tuning controller host and field test equipment is achieved through ZigBee wireless networking method, so as to achieve the purposes of making PID parameter tuning device miniaturization, networking and intelligent. Simulation results show that the ZigBee technology can effectively reduce workload of parameter tuning experiment and improve flexibility and control quality of the PID controller, and extend its scope of application.

Application of 3D software in design of large capacity and long distance coal pipeline

HUANG Meng, TU Zhaomei, TIAN Dali, WANG Qia

2016, 42(12): 92-95. doi: 10.13272/j.issn.1671-251x.2016.12.020

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Abstract:
In view of problem of large work amount and error-prone of pipeline layout using 2D software, advantages and disadvantages of 3D software used in domestic design field were analyzed, and Solidworks software was proposed to apply to design of large capacity and long distance coal pipeline. The application of Solidworks software in schematic design stage, preliminary design stage and construction drawing stage of coal pipeline was introduced in detail.

2016 Vol. 42, No. 12

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