2017 Vol. 43, No. 1

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Research on proximity detection method for machines in coal mine
BAO Jianjun
2017, 43(1): 1-4. doi: 10.13272/j.issn.1671-251x.2017.01.001
<Abstract>(92) <HTML> (8) <PDF>(11)
Abstract:
Based on analysis of different properties and application status of mainstream proximity detection methods for machines in coal mine, a novel proximity detection method using high wireless precision ranging and three-dimensional location technology was proposed. The method uses wireless distance measurement method SDS-TW-TOA to measure distance between personal tag and detector, calculates precise coordinates of personal tag relative to mobile device through three-dimensional least squares method, and finally obtains detection result through regional setting and judgment. Field test results show that the proposed method can achieve 360° detection around the equipment, and has characteristics of high positioning accuracy, short response time and convenient configuration compared with RSSI method and magnetic field marker method.
Development of mine-used intrinsically safe equipment monitoring substation based on wireless communicatio
DU Yan, KAN Zhe, FENG Yu, SUN Pengfei, MENG Guoying, ZHU Sanying, MAN Xiaochen, LI Yong
2017, 43(1): 5-8. doi: 10.13272/j.issn.1671-251x.2017.01.002
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In view of poor real-time performance and complex wiring existed in traditional operating condition monitoring of coal mine mechanical and electrical equipment, a mine-used intrinsically safe equipment monitoring substation based on wireless communication was developed in accordance with requirements of coal mine safety certification. Structure, intrinsically safe hardware circuit design, shell protection design and software implementation of the monitoring substation were introduced. The monitoring substation can realize multi-channel vibration and temperature signal acquisition and wireless transmission of mine-used equipment, which provides data support for fault diagnosis and prediction of mine-used equipment.
Vibration signal identification of coal-rock cutting of shearer based on cepstral distance
ZHANG Qizhi, QIU Jinbo, ZHUANG Deyu
2017, 43(1): 9-12. doi: 10.13272/j.issn.1671-251x.2017.01.003
<Abstract>(87) <HTML> (18) <PDF>(12)
Abstract:
In order to solve problems that conventional time-frequency domain analysis methods were sensitive to noise and had poor adaptability of energy change in coal-rock interface identification based on vibration signal analysis, a vibration signal identification method of coal-rock cutting of shearer based on cepstral distance was proposed. By analyzing cutting vibration signals of shearer acquired by vibration sensor under different load conditions, following conclusions are gotten. Compared with condition of cutting rock, the cepstral distance between vibration signal under condition of cutting coal and standard signal under no load condition is larger. The cepstral distance of the vibration signal under condition of rock cutting is obviously periodic, and the cycle is one rotation cycle of shearer drum, while the vibration signal under condition of cutting coal has no periodic feature. The industrial test result shows that the method has identification accuracy of 75% when hardness difference between coal and rock is more than 10 MPa.
Research on automatic detection device of hydraulic support controller
YANG Hanhong, MENG Feng
2017, 43(1): 13-17. doi: 10.13272/j.issn.1671-251x.2017.01.004
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Abstract:
In view of problem of low detection efficiency existed in detection process of coal mine hydraulic support controller, an automatic detection device of hydraulic support controller was designed. The device achieves automatic detection of functionality, performance and reliability of hydraulic support controller, improves detection efficiency, software adaptive performance and product quality of the hydraulic support controller, which will play a positive role in development of hydraulic support electric control system.
Development of an amplified telephone system for mine-used belt conveyor
LI Hongwei, QU Bingni, LI Lu, SONG Jiancheng
2017, 43(1): 17-21. doi: 10.13272/j.issn.1671-251x.2017.01.005
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Abstract:
In view of problem that voice alarm sound ca't broadcast along belt of existing monitoring system of mine-used belt conveyor, an amplified telephone system for mine-used belt conveyor was developed.The system has functions of voice alarm, half-duplex communication and dot calls and contact, and has good sound clarity with volume as high as 100 dB, which can satisfy requirements of complex environment of coal mine.
Study on unmanned mining technology of fully mechanized coal mining face
SUO Zhiwe
2017, 43(1): 22-26. doi: 10.13272/j.issn.1671-251x.2017.01.006
<Abstract>(119) <HTML> (38) <PDF>(23)
Abstract:
The paper analyzed present situation of development of fully mechanized coal mining face, including application situation and existing problems of technologies of memory coal cutting, hydraulic support automation, coal and rock identification and so on. It put forward realization way of technologies of high speed transmission wireless network construction, standardized data transmission, fuzzy judgment and self-adapting coal cutting of shearer, advanced hydraulic support automation, live imaging and automatic alignment of working face.
Status and development of shearer
YANG Yu
2017, 43(1): 26-28. doi: 10.13272/j.issn.1671-251x.2017.01.007
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Abstract:
According to problems existed in development status of thin seam shearer and thick seam shearer, research directions of shearer technology were put forward combing with development trend of shearer, which were improving reliability of key components such as shearer haulage system and ranging arm planetary mechanism, strengthening research of advanced technology and basic theory and studying shearer with new structure in advance.
Coal-rock interface recognition based on terahertz time-domain spectroscopy
WANG Xin, HU Kexiang, YU Xiao, DING Enjie
2017, 43(1): 29-34. doi: 10.13272/j.issn.1671-251x.2017.01.008
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Abstract:
In order to study feasibility of coal-rock interface recognition based on terahertz time-domain spectroscopy, some experiments were taken out by using terahertz time-domain spectroscopy, which used gas coal and sandstone powder tablet as samples. Time delay and attenuation amplitude that caused by terahertz pulse transmission between different samples were obtained. Hilbert-Huang transform was used to make time-frequency analysis of the samples' terahertz spectrum, and the analysis results were compared with the ones by traditional fast Fourier transform method. The comparison results show that resolution of terahertz spectrum is higher in time-frequency domain, and frequency and energy components of terahertz pulse can be analyzed better and more intuitively at any time as well as absorption effect of any frequency at different time. Coal-rock interface recognition process based on terahertz time-domain spectroscopy was introduced. The experimental results show that coal-rock medium can be well distinguished by characteristic value extracted by Hilbert spectrum and marginal spectrum.
Improved memory program control strategy of height adjustment of shearer roller
LIU Qingguo, CAO Peng
2017, 43(1): 34-37. doi: 10.13272/j.issn.1671-251x.2017.01.009
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Abstract:
In order to improve accuracy of height adjustment of shearer roller, static height adjustment model of shearer roller was given, relationship between response time of hydraulic height adjustment system and memory program control strategy was analyzed, and improved memory program control strategy which considered response time of hydraulic system was proposed. The improved strategy simplifies roller height variation to linear variation, can avoid phenomenon of cutting roof during process of roller height adjustment. It improves cutting safety, and has advantages of simple algorithm and high adjustment precision.
Research on variation rule of surface potential of coal rock during water-inrush process
KONG Yanhui, LI Zhonghui, QIU Liming, SHEN Rongxi
2017, 43(1): 38-42. doi: 10.13272/j.issn.1671-251x.2017.01.010
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Abstract:
Surface potential of coal rock during water-inrush process was tested through a simulated experiment system for surface potential of coal rock, and variation rule of the surface potential of coal rock during water-inrush process was researched. Following conclusions are gotten: The surface potential of coal rock has significant spatiotemporal response characteristics for water-inrush evolution, and can reflect internal rupture and crack expansion conditions of coal rock. Water bursting evolution is divided into three periods, namely incubation period, crack expanding period and systematical water-inrush period. The surface potential signals are relatively stable during incubation period, and fluctuate during crack expanding period and systematical water-inrush period. The surface potential signal level is usually different in different positions. In the same position, the surface potential signal level has positive correlation with pore water pressure or breaking intension of coal rock.
Research of a kind of multistage belt speed-regulation system
YUAN Gang, LI Lihong
2017, 43(1): 42-47. doi: 10.13272/j.issn.1671-251x.2017.01.011
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In view of problem of big error between adjustment speed and expected speed of existing multistage belt speed-regualtion system adopting two-dimensional fuzzy control algorithm, a kind of adaptive neural fuzzy inference system (ANFIS) model was established, and a multistage belt speed-regualtion system based on ANFIS was designed. The speed-regualtion system takes instantaneous flow and real-time speed of the first belt as input, and takes regulating frequency of frequency converter as output to realize speed control. The Matlab simulation results show that the speed control error of the speed-regualtion system introducing ANFIS model is below 2%, capacity and belt speed matching rate are optimized, which has certain application value for energy saving and emission reduction of coal mine enterprises.
Design of embedded collaborative simulation platform for complex equipment on fully-mechanized coal mining face
CUI Jing, LUAN Baowei, REN Laihong, LU Zhenguo, YANG Yanchao
2017, 43(1): 48-52. doi: 10.13272/j.issn.1671-251x.2017.01.012
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In view of problem that traditional single-domain simulation platform cannot meet requirement of large-scale collaborative simulation of complex equipment on fully-mechanized coal mining face, an embedded collaborative simulation platform for complex equipment on fully-mechanized coal mining face was designed based on HLA technology. Overall architecture of the platform was introduced, and development processes of MATLAB adapter, ADAMS adapter, PLC adapter and adapter of data acquisition card for software and hardware simulation models of the platform were expounded. Function of the platform was tested by taking collaborative control system of three machines on fully-mechanized coal mining face as an example. The test results show that the platform can realize data interactive simulation among heterogeneous models.
Method of sequence start of multi-level belt conveyors based on speed control
ZHANG Yajun, QIAO Tiezhu
2017, 43(1): 52-55. doi: 10.13272/j.issn.1671-251x.2017.01.013
<Abstract>(54) <HTML> (10) <PDF>(18)
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In order to increase energy-saving efficiency of belt conveyors, a control method of sequence start along the direction of material transport for multi-level belt conveyors was proposed. On the premise of maximum utilization of material cross section on the belt, firstly, matching model between belt speed and load was built. Then, frequency adjustment between belt speed after the soft start and the matching belt speed was implemented by designing scientific and available acceleration curve. Finally, the sequence start control time of multi-level belt conveyors was calculated. The simulation results show that the method increases energy-saving efficiency to 12%.
Evaluation of coal preparation plant separation effect based on multi-level fuzzy comprehensive evaluatio
CHEN Peng, PAN Dong, SHI Kaiyi, JI Yonghua
2017, 43(1): 56-60. doi: 10.13272/j.issn.1671-251x.2017.01.014
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Abstract:
In order to reflect situation that whether products meet index requirements in coal preparation plant, a multi-level fuzzy comprehensive evaluation method was proposed. Taking production data of seven months in one coal preparation plant as research object， the heavy medium separation product index, the coarse slime separation product index and flotation product index were concentrated to form a fuzzy relation matrix, the weight vector was constructed by expert scoring method. And the production data of seven months was calculated by the multi-level fuzzy comprehensive evaluation method. The evaluation results indicated that the optimal target was January and July, and separation effect of February to May was suboptimal. By contrast, separation effect of June was unfavorable. This conclusion is in conformity with field separation effect.
Power combination mechanics of wireless power transmission system based on multi inverters
LIU Suqi , TAN Jianping , WEN Xue
2017, 43(1): 60-65. doi: 10.13272/j.issn.1671-251x.2017.01.015
<Abstract>(46) <HTML> (8) <PDF>(6)
Abstract:
For the problem that output power of a single inverter in wireless power transmission system could not satisfy large power requirement, power combination mechanics of wireless power transmission system based on multi inverters was researched. An equivalent circuit model of wireless power transmission system was built which was based on power combination topology of two inverters, and laws of output power and transfer efficiency of the system were obtained. The research results are as following. Output power and transfer efficiency of the system are shared by each branch inverter, and distributed in each branch complementarily because of different power driving ability of each branch. System characteristics of wireless power transmission system based on power combination of multi inverters is identical with that of the system based on single inverter.
Research on application of Hadoop in personnel positioning software system
WANG Wei
2017, 43(1): 66-68. doi: 10.13272/j.issn.1671-251x.2017.01.016
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In order to solve the problem that existing personnel locating system can not meet large data access requirement of large-scale coal mines, Hadoop was proposed to be used in personnel positioning software system, and parallel computing model MapReduce and non-relational database HBase were used to realize parallel access of personnel positioning data. The application of Hadoop can significantly improve data processing performance, real-time performance and scalability of personnel positioning software system.
Construction of case base system of mine water disaster under background of big data
LIU Hao, WEN Guangchao, XIE Hongbo, WANG Linlin, SHI Yankun, JIANG Zeyu
2017, 43(1): 69-73. doi: 10.13272/j.issn.1671-251x.2017.01.017
<Abstract>(36) <HTML> (8) <PDF>(6)
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In order to improve informationization level of coal mine water disaster prevention, and realize changes of mine water disaster prevention work from qualitative to quantitative and from experience to science, purpose and principles of construction of case base system of coal mine water disaster prevention and control under background of big data were proposed, and structure and function modules were designed. Key technologies of IoT, cloud computing, big data were analyzed. The case base system of coal mine water disaster integrates accident management, water disaster prevention, safety education and technical training.
Research of ontology construction of coal mining face based on formal concept analysis
LIU Ting, PAN Lihu, ZHANG Sulan, CHEN Lichao, ZHANG Yingjun
2017, 43(1): 73-76. doi: 10.13272/j.issn.1671-251x.2017.01.018
<Abstract>(49) <HTML> (8) <PDF>(4)
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In view of problem of time-consuming and subjective dependence of traditional ontology construction method, an ontology construction method of coal mining face based on formal concept analysis was proposed. The method can discover concepts implied in domain data and relationship between the concepts effectively, use concept lattice to visualize ontology and add new information to ontology automatically, and realize semi-automatically update of ontology. Experiment proved effectiveness of the proposed method.
Switching control between variable frequency and power frequency of emulsion pump in coal mine
FU Xiang, WANG Ranfeng, YUAN Jicheng, DONG Zhiyong
2017, 43(1): 77-80. doi: 10.13272/j.issn.1671-251x.2017.01.019
<Abstract>(46) <HTML> (10) <PDF>(10)
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In view of problem of high impulse current when scheme of multiple pumps linkage with one frequency converter applied in coal mine emulsion pump station, asynchronous switching and synchronous switching control scheme between variable frequency and power frequency of emulsion pump were proposed. The field test results show that the synchronous switching control can avoid impulse current more effectively and truly realize free switching between variable frequency and power frequency.
煤矿乳化液泵变频/工频切换控制
付翔, 王然风, 袁继成
2017, 43(1): 81-84. doi: 10.13272/j.issn.1671-251x.2017.01.020
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针对煤矿乳化液泵站采用变频器“一拖多”的多泵联动方案时存在冲击电流大的问题，提出了乳化液泵变频/工频异步切换和同步切换控制方案。现场试验结果表明，变频/工频同步切换控制能更有效地避免冲击电流，真正实现乳化液泵变频至工频的无扰切换。

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