2018 Vol. 44, No. 3

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Cover Catalogue
Optical fiber sensor for mine safety Internet of things
LIU Tongyu, WANG Jiqiang, MENG Xiangjun, LI Wei, JIN Guangxian, HU Jie, WEI Yubin, WANG Zhenping, HU Binxin, SONG Guangdong, MA Junpeng, WANG Jinyu, SONG Chengxiang, ZHANG Tingting, LI Yanfang, WANG Fengxue
2018, 44(3): 1-7. doi: 10.13272/j.issn.1671-251x.17315
<Abstract>(70) <HTML> (1) <PDF>(13)
Abstract:
For disadvantages of traditional electronic sensors in mine safety monitoring system such as low precision, poor reliability, a large amount of maintenance, monitoring dead-zone and so on, it was proposed that using optical fiber sensors and wireless sensor to build mine monitoring system of human, machine and environment with multi-dimension, multi-parameter and large capacity. Advantages of optical fiber sensor applications in the mine safety monitoring system were introduced. The operational principle of optical fiber sensors developed for mine applications were described, which included laser spectral analysis based gas sensors, fiber Bragg grating based physical sensors and distributed optical fiber temperature sensor. Meanwhile, typical applications of optical fiber sensors in mine safety Internet of things were introduced including laser methane sensor in coal mine safety monitoring system, optical fiber acceleration sensor in micro-seismic monitoring system and distributed optical fiber temperature sensor in goaf fire monitoring and pre-alarming system.
Visual tracking method of shearer based on compressive sensing
SUN Jiping, SHAO Zipei, LIU Yi
2018, 44(3): 8-11. doi: 10.13272/j.issn.1671-251x.17313
<Abstract>(69) <HTML> (8) <PDF>(5)
Abstract:
For problems of low illumination intensity, uneven illumination and high coal dust concentration in working face, a visual tracking method of shearer based on compressive sensing was proposed. The image is normalized by use of rectangular filter firstly to get feature vectors. Then compressed Haar-like feature vectors of target samples and background samples are gotten according to compressive sensing theory for building target model and training naive Bayes classifier. The target image and background image are identified by the naive Bayes classifier finally, so as to realize dynamic tracking of shearer. The experimental result shows that the method can track shearer effectively when the shearer is moving or covered in environment of uneven and varied illumination, and average tracking frame rate is 22 frames per second.
Research on mine integrated communication system
ZHANG Liya
2018, 44(3): 12-16. doi: 10.13272/j.issn.1671-251x.17264
<Abstract>(53) <HTML> (1) <PDF>(10)
Abstract:
For problems of independent operation of each system in coal mine underground and too many base stations with shortage of wireless data transmission bandwidth, a mine integrated communication system was designed by use of LTE technology. The system can realize unified accessing, loading and management of multi businesses through integrated base stations such as wireless communication, precise personnel and locomotive positioning, IP telephony, voice broadcast and so on, and connection to existing business interfaces. The test result shows that the integrated base station in the system has covering radius of 400 m with received signal strength of no less than -105 dB, switching time of wireless communication among the base stations is 21.67 ms, and the system has higher wireless communication quality.
Research on automatic loading device of durability test of internal injection type single prop
ZHANG Yue, YAO Yuwei, SHA Baoyin, ZHAO Yue
2018, 44(3): 16-20. doi: 10.13272/j.issn.1671-251x.2017060060
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Abstract:
In order to solve problems of large labor intensity and low efficiency existed in durability test process of internal injection type single prop with manual loading and unloading method, a set of automatic loading device of durability test of internal injection type single prop was developed. The device uses measurement and control software for industrial personal computer to control servo motor and speed reducer to drive load tooling rotate, realizes operation of lifting and falling prop of internal injection type single prop by the servo motor driver, and automatically control loading process of the prop; uses the servo motor to drive unloading handle to achieve operation of unloading and falling prop. The device can also realize precise control of load speed, torque, position of the motor to prevent overload and locked-rotor of loading mechanism. The test results show that the control device has high control accuracy, fast loading speed, stable and reliable performance, which improves automation level of durability test of the internal injection type single prop.
Design of automatic oxygen supply system of refuge chamber
ZHANG Ming, LI Sujing, LI Wei
2018, 44(3): 21-25. doi: 10.13272/j.issn.1671-251x.2017090074
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Abstract:
In view of problem that most of existing oxygen supply systems of refuge chamber applied multistage protection system, and oxygen supply subsystems are independent of each other and cannot automatically switch among them, which causes the oxygen supply unstable, an automatic oxygen supply system of refuge chamber based on PLC and PID monitoring technology was designed. The system integrates multistage oxygen supply systems and environment parameters monitoring system through loop optical fiber system. Based on the detected environment parameters in real-time, and uses PLC and PID monitoring technology, the system can realize intelligent adjustment between all levels of oxygen supply system and automatic continuous supply oxygen of underground refuge chamber, and can automatically switch to the next level of oxygen supply system when a certain level of oxygen supply system happens failure, which improves stability and safety of the oxygen supply of refuge chamber. The site test results verify reliability of the system.
Dynamic correlation technology of wireless control device for hydraulic support
NIU Yicun
2018, 44(3): 26-30. doi: 10.13272/j.issn.1671-251x.2017100071
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Abstract:
In order to solve problem of safety operation of wireless control device for hydraulic support, working principle of the wireless control device for hydraulic support was analyzed, and a scheme of dynamic correlation of the wireless control device for hydraulic support was proposed based on infrared pyroelectric human body sensing technology. Human body sensing device for working face was developed to realize dynamic correlation of the wireless hand-held controller and hydraulic support driver, which improved operation safety of the wireless control device. Test results show that detection angle of the human body sensing device is 110°, detection distance is 10.6 m. In dynamic correlation action, communication connection delay time is about 1.1 s, and blocking action delay time is about 0.3 s, which can meet the requirements.
Important characteristics and realization ways of wisdom mine
HE Min
2018, 44(3): 31-35. doi: 10.13272/j.issn.1671-251x.2017100061
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Abstract:
Current status and problems of mine informatization construction were analyzed. Important characteristics of wisdom mine which were different from the ones of automation mine, informatization mine and digitalized mine were summarized, namely thorough perception, deep interconnection and high intelligence. Realization ways of wisdom mine were proposed, which include making technical specification and standard of wisdom mine, implementing complete digitalization of mine information, researching and promoting advanced intelligent technology and equipment, and developing wisdom decision application.
Research on construction and reasoning of coal mine accident case ontology knowledge base
ZHANG Baolong, WANG Xiangqian, LI Huizong, HE Yerong
2018, 44(3): 35-41. doi: 10.13272/j.issn.1671-251x.2017110017
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Abstract:
In order to solve problem of insufficient knowledge organization, sharing and reuse of coal mine accident cases, the ontology was introduced into knowledge management of accident cases, and construction and reasoning technology of the ontology-based accident case knowledge base were studied. Based on analysis of the accident case knowledge, accident knowledge representation model and accident case body model were constructed. According to knowledge base model and construction method, the coal mine accident case ontology and rule base were constructed respectively, thus the knowledge base was constructed. Knowledge reasoning application based on the knowledge base of mine accident case was realized with gas accident as an example. The research results show that using the knowledge base of coal mine accident case can achieve the knowledge organization and knowledge automatic inference, and can greatly improve sharing and reuse of the mine accident case knowledge.
Research on coal mine safety ontology
SHI Qinfu, LIU Xiulei, LIU Xuhong, SHENG Liguo, HUANG Zhixian
2018, 44(3): 42-49. doi: 10.13272/j.issn.1671-251x.2017100007
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Abstract:
Common ontology languages, construction principles and construction methods were summarized. It was considered that constructing coal mine safety ontology should adopt OWL-DL language and the construction method of cyclic acquisition method or seven-step method. Current research status of the coal mine safety ontology was analyzed from aspects of coal mine digging and coal mine disaster event ontology, coal mine safety database query ontology and coal mine safety knowledge concept ontology. Advantages, disadvantages, application scene and construction process of the three coal mine safety ontologies were summarized, and an ontology integration strategy of the above three coal mine safety ontologies was proposed.
Research on coal big data and its developing directio
TAN Zhanglu, MA Yingying
2018, 44(3): 49-52. doi: 10.13272/j.issn.1671-251x.2017110059
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Source and characteristics of coal big data were introduced, and present application situation of the coal big data was analyzed. Significance of platform development of the coal big data to its construction was expounded, and some problems existed in construction of the coal big data platform were analyzed about data sharing, data quality, safety, professionals and so on. It was pointed out that constructing the coal big data platform should make top-level design, improve standard system of coal data, train professionals and rationally design platform framework.
Research on automatic control technology of large mining height hydraulic support
WANG Haiju
2018, 44(3): 53-58. doi: 10.13272/j.issn.1671-251x.2017080033
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Abstract:
In view of problems of high roof pressure, serious spalling and roof falling and instable support in production of large height mining face, demands of automation control technology of the large mining height hydraulic support were analyzed. The automatic control technologies of large mining height hydraulic support were researched from roof, coal slip wall management of working face, anti-skid and anti-dumping control of hydraulic support, multi-level linkage control of face guard, intelligent following control of hydraulic support: the support force of hydraulic support on working face roof was reached setting load adopting hydraulic support automatic shift control and automatic pressure compensation technology, so as to realize effective management for the working face roof; management efficiency of coal wall on working face was effectively improved by attitude control and support pressure control of face guard, rib spalling accident was prevented; pseudo inclined automatic control of hydraulic support on working face was realized by using angle sensors, distance sensor and laser sensor to detect support attitude; logic control of multi-stage face guard was realized by installed proximity sensor on face guard; position detection of shearer was used infrared sensors, automatic following control of large mining height hydraulic support was realized according to the coal mining process.
Dynamics characteristics analysis of coal plow system under starting and braking conditio
ZHANG Yu, CHEN Hongyue, HAO Zhiyong, MAO Jun
2018, 44(3): 59-65. doi: 10.13272/j.issn.1671-251x.2017050022
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Abstract:
In view of problems of large impact of coal plow system under starting and braking condition，dynamic model of the coal plow system was established comprehensively considering factors of sprocket wheel polygon effect, horizontal vibration of drive sprocket shaft, and coupling characteristics between driving device and plow chain. Dynamic characteristics of the system under condition of starting, braking and reverse starting after braking were analyzed by numerical analysis method, and vibration characteristics curves of the front and rear chain tension were obtained. The analysis results show that the system dynamic characteristic are the most stationary by using reverse "S" start scheme, the method is more advantageous to the coal plow system; the nearer the distance between the plow head and the machine head is，the larger plow chain tension impact is; due to time difference between nose and tail of the machine, tension in the front and back end of the chain has a great impact in the starting process; the plow chain tensions produce difference because of uneven distribution after the coal plow system barking，the plow chain tension of the front end has great impact at the reverse restart moment, and it falls with the starting process. The research results provide theoretical basis for designing reasonable start and brake system of the coal plow.
Numerical simulation analysis of attenuation characteristics of ultrasonic propagation in tailing slurry
WANG Jianxin, GAO Xin, ZHANG Yanping
2018, 44(3): 65-69. doi: 10.13272/j.issn.1671-251x.2017090070
<Abstract>(26) <HTML> (1) <PDF>(5)
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In view of problems that existing ultrasonic detection method for concentration of tailing slurry has low accuracy and too many parameters, and cannot accurately reflect attenuation characteristics of the ultrasonic propagation in tailing slurry, attenuation characteristics of ultrasonic propagation in tailing slurry with fixed parameters were simulated by using Matlab software based on the theoretical analysis of attenuation characteristics of ultrasonic, and relationships between ultrasonic attenuation coefficient and ultrasonic frequency, particle size and density of tailings slurry were obtained: when the ultrasonic frequency is constant, the scattering attenuation increases with increasing of the particle size of tailing slurry; when the ultrasonic frequency and particle size of tail slurry are a fixed value, the viscosity attenuation coefficient increases with increasing of the density of tail slurry; when the ultrasonic frequency and density of tailing slurry are a fixed value, the larger of the particle size of tailings slurry, the smaller of the viscosity attenuation coefficient; both of the scattering attenuation and viscosity attenuation increase with increasing of the ultrasonic frequency, the scattering attenuation coefficient is proportional to the fourth power of ultrasonic frequency, and the viscosity attenuation coefficient is proportional to the ultrasonic frequency. The analysis results provide a theoretical basis for design of ultrasonic concentration sensor with high precision.
Sharpening algorithm for underground images with fog and dust
WU Kaixing, ZHANG Lin, LI Lihong
2018, 44(3): 70-75. doi: 10.13272/j.issn.1671-251x.2017100078
<Abstract>(32) <HTML> (3) <PDF>(7)
Abstract:
In view of fuzzy and degenerated images in coal mine environment due to presence of large amounts of coal dust and water mist, a sharpening algorithm based on dark primary principle and principal component analysis was proposed. Based on atmospheric scattering model, transmittance is calculated according to the dark primary principle. The principal component analysis is used to obtain brightness, saturation and contrast, which can fully reflect fog image information. Atmospheric light value is calculated by weighting these indexes, so as to realize sharpening process of underground images with fog and dust in underground coal mine. The simulation results show that the proposed algorithm can restrain image detail to a great extent, maintain authenticity and structural integrity of the image, and have good real-time performance.
Optimization method for mine rescue path based on ant colony algorithm
GONG Xingyu, CHANG Xintan, JIA Pengtao, LUO Bibo
2018, 44(3): 76-81. doi: 10.13272/j.issn.1671-251x.2017030023
<Abstract>(93) <HTML> (7) <PDF>(7)
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In view of optimization problem of emergency rescue path in underground fire condition, an optimization method for mine rescue path based on ant colony algorithm was proposed. Hierarchical structure model of influencing factors on mine rescue path selection was established, and according to degree of importance, the influencing factors were listed as follows: CO concentration, gas concentration, wind speed, roadway difficulty and personnel quality. The quantification of each factor is used to update pheromone of the ant colony algorithm to find and save the optimal path. The simulation results show that the optimal path can be selected by using the rescue path optimization method based on the ant colony algorithm, and the optimal solution has good convergence.
Fault diagnosis method for rolling bearing of shearer based on HGWO-MSVM
SUN Mingbo, MA Qiuli, ZHANG Yanliang, LEI Junhui
2018, 44(3): 81-86. doi: 10.13272/j.issn.1671-251x.2017110006
<Abstract>(48) <HTML> (2) <PDF>(6)
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In view of problems of difficult extracting of fault feature vector and unsatisfactory multi-classification effect of shearer rolling bearing, a fault diagnosis method for rolling bearing of shearer based on HGWO-MSVM was proposed. The bearing fault signal is denoised by wavelet and decomposed by empirical mode decomposition algorithm, then energy characteristic value is extracted and used as training set and test set of MSVM. The MSVM is used to identify fault status and parameters of MSVM are optimized by HGWO algorithm. The experimental results show that the fault diagnosis model of shearer bearing based on HGWO-MSVM can obviously improve accuracy and efficiency of fault identification compared with GWO, GA and PSO optimization MSVM model.
Random vibration response analysis of longitudinal roadheader
HE Yang, LI Xiaohuo
2018, 44(3): 87-91. doi: 10.13272/j.issn.1671-251x.2017100038
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In order to research random vibration characteristics of longitudinal roadheader under random cutting load, a multi-rigid-body dynamics model of the longitudinal roadheader was established by use of ADAMS software. Vibration characteristics of cutting head, boom and body under axial drilling, vertical cutting and horizontal cutting were simulated. The simulation results show that axial drilling has the greatest influence on vibration of each part of the longitudinal roadheader, and vertical displacement response of random vibration is greater than horizontal displacement response of random vibration under axial drilling. There is little difference between horizontal displacement response and vertical displacement response of random vibration under vertical cutting and horizontal cutting. Horizontal cutting has the least influence on vibration of the body.
Analysis of frequency characteristics of three-coil magnetic coupling resonant wireless power transmission system
LI Xinheng, GONG Lijiao, FENG Li, SUN Xiangyu, LI Yang, LI Hui
2018, 44(3): 91-96. doi: 10.13272/j.issn.1671-251x.2017090019
<Abstract>(67) <HTML> (2) <PDF>(6)
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An equivalent circuit model of three-coil magnetic coupling resonant wireless power transmission system was built, and formulas of system transmission power and transmission efficiency were deduced. Coupling factors relation with the maximum system transmission power was obtained under critical coupling state, and relationship expression between coupling factor and frequency splitting point was given. Frequency characteristics of the system were analyzed. The theoretical analysis results show that there is frequency splitting phenomenon in the system under overcoupling state with three frequency splitting points; the system only resonates at inherent resonant frequency under critical coupling state and undercoupling state; whether there is frequency splitting phenomenon or not, the system resonates at inherent resonant frequency, and transmission power of the system reaches the maximum. The simulation and experimental results verify correctness of the theoretical analysis.
Parameterized modeling and analysis system of shearer key parts
XIE Aizheng, DING Hua, WANG Yiliang
2018, 44(3): 97-101. doi: 10.13272/j.issn.1671-251x.2017090014
<Abstract>(38) <HTML> (7) <PDF>(4)
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In order to improve efficiency of modeling and finite element analysis of shearer key parts and reduce requirement for software opertation level of user, a parameterized modeling and analysis system of shearer key parts was developed by use of NX secondary development tool under Visual Studio 2012 integrated compilation environment. The system associates parameters entered by the user with interface functions in application programs, and uses dimension driving method to modify parameterized expressions, so as to achieve parameterized modeling of shearer key parts. Parameterization of finite element analysis is realized by acquiring NX NASTRAN interface function with Journal tool. The effectiveness of the system is verified by an example.
A 3D modeling method of bending zone in overburden strata
SHI Xiaonan, JIN Qifeng, SHEN Xia
2018, 44(3): 102-105. doi: 10.13272/j.issn.1671-251x.2017070023
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For problem that tri-prism model cannot accurately represent irregular stratum structure especially borehole deviation, a 3D modeling method of bending zone in overburden strata based on generalized tri-prism model was proposed. Firstly, 3D geological model of overburden strata before mining is constructed based on the generalized three-prism model by use of drilling raw information. Then range of bending zone is determined through distinguishing key strata position. Finally, deformation parameters of the bending zone in overburden strata are estimated to modify the 3D geological model of overburden strata before mining, so as to establish 3D geological model of bending zone in overburden strata after mining. The example analysis result verifies validity of the method.

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