工矿自动化

Top-down design of mine Internet of things

DING Enjie, SHI Weizu, ZHANG Shen, ZHAO Xiaohu

2017, 43(9): 1-11. doi: 10.13272/j.issn.1671-251x.2017.09.001

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Abstract:
Current status of mine Internet of things technology and its industrial development pattern were introduced. It was pointed out that top-down design of mine Internet of things was for designing perception mine from the state safe production supervision, realizing objects connection of mine Internet of things, and confirming service essence of mine Internet of things. Development trend of mine Internet of things was discussed, namely key technologies would be broken through continuously, service carrying pattern would appear gradually, and the government and enterprises would promote development of mine Internet of things jointly. Following development fields of mine Internet of things were focused on: breakthrough of core and key technologies including intelligent equipments with micromation and energy capturing technology, mine network, communication and post-disaster reconstruction technology, cloud computing, big data and safe production management technology, mine semanteme and virtualization technology, and safety, privacy and credible network technology; five sensing application including sensing miner, sensing disaster, sensing equipment, sensing mine area and sensing management; construction of cloud service hierarchy; standardization construction. Safeguard measures and construction route of mine Internet of things were proposed.

Discussion on definition of wisdom mine

HE Min

2017, 43(9): 12-16. doi: 10.13272/j.issn.1671-251x.2017.09.002

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Abstract:
Problems about definition of wisdom mine in existing literatures were analyzed. According to definition method of specific difference addition genus, eight common attributes and four unique attributes of wisdom mine were summarized through comparative analysis of relationships among wisdom mine, automation mine, informatization mine and digitalized mine, so as to form a definition of wisdom mine. The wisdom mine is based on technologies of spatial information, Internet of things, cloud computing, big data, artificial intelligence, database, data communication, true three-dimensional geological model, virtual reality, wisdom mining and so on, and applies all kinds of sensors, automatic control systems and component type software synthetically to realize automatic operation, intelligent decision and self-learning.

Discussion on evaluation index system and architecture of smart mine

HE Yaoyi

2017, 43(9): 16-20. doi: 10.13272/j.issn.1671-251x.2017.09.003

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Abstract:
In view of existing status of different construction level and lack of unified industrial standard of smart mine, evaluation index system of smart mine was proposed based on definition of smart mine, and grading evaluation method of smart mine was developed to provide criteria and basis of smart mine construction. Meanwhile, architecture of smart mine was described from Internet of things perception layer, collaborative management and control layer, intelligent mine decision support layer and intelligent cloud decision support layer, and specification requirements of each layer content and relationship among the layers were put forward, so as to form unified measurement of smart mine.

Design of intelligent decision support technology architecture for wisdom mine

GAO Wen

2017, 43(9): 21-25. doi: 10.13272/j.issn.1671-251x.2017.09.004

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Abstract:
Intelligent decision support technology architecture for wisdom mine based on new generation of big data technology and cloud computing technology was put forward based on analysis of application status of mine decision support system. The architecture uses Hadoop and other big data technologies to solve problems of traditional decision support system, including unable to horizontally expand computing resources, long response time, and unable to analyze data combining with discrete management information data and automated measurement and control data; through introduction of stream calculation, sovles problem that the traditional decision support systems can not effectively deal with unbounded data. The architecture has capability of carrying out professional analysis model of mine and information business analysis model for general management, it can fully integrate relevant data of"people", "machine", "ring" and "management", form a comprehensive decision support information, and provide core technical support for realization of mine intelligence.

Mathematical analysis of memory coal cutting of shearer and its implementatio

SUN Zhuo

2017, 43(9): 26-31. doi: 10.13272/j.issn.1671-251x.2017.09.005

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Abstract:
Existing automatic coal cutting methods of shearer lack appropriate mathematical model and algorithm and cannot realize long-term and continuous automatic coal cutting, which restrict improvement of working face automation level. For above problems, function relationships among shearer attitude, shearer position and cutting height were analyzed in 3D coordinate system. Motion equations of shearer were built based on stationary and moving coordinate systems separately. Memory coal cutting algorithms of double demo knives and single demo knife were presented as well as their implementation methods in the moving coordinate system respectively. The memory coal cutting algorithm of single demo knife is applied in No.31112 working face of Jinjie Coal Mine for automatic coal cutting in the whole working face including triangle area, which verifies correctness, effectiveness and robustness of the algorithm.

Fault diagnosis design for coordinate control system of main coal transport route

KONG Weishe

2017, 43(9): 32-36. doi: 10.13272/j.issn.1671-251x.2017.09.006

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Abstract:
For difficult manual maintenance of coordinate control system of main coal transport route, a fault diagnosis module for the system was developed, and fault diagnosis principle of the system was introduced from aspects of equipment-level diagnosis, system-level diagnosis and remote diagnosis. The equipment-level diagnosis records important events of sensors, intrinsically safe power and so on, and sends the records to coordinate controller of the system. The system-level diagnosis times each equipment in the system uniformity, and adopts the coordinate controller to analyze fault cause through fault diagnosis algorithm and send the analyzed results to centralized control room on the ground. The remote diagnosis is analyzing and confirming fault cause through engineers in the centralized control room or developers in equipment manufacturing enterprise, so as to notify inspectors to remove fault.

Emergency management method for coal mines based on task network planning technology

PENG Wuliang, REN Hongxiao

2017, 43(9): 36-40. doi: 10.13272/j.issn.1671-251x.2017.09.007

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Abstract:
To improve standardization and automation levels of emergency management in coal mines and solve linking problem between emergency plan and emergency decision, a new emergency management method for coal mines based on task network planning technology was presented. Firstly, emergency preparation plan is standardized treated based on reconfigurability of the emergency preparation preparation plan, each emergency measure is taken as a task to form emergency preparation plan by the task network plan technology; then the emergency plan is used as template for emergency execution plan and thus the complete and standardized emergency execution plan can be quickly formed by correcting the emergency preparation plan according to types, specific circumstances, resource conditions of emergency disposal and moderate personal preference of emergencies. The practical application shows that the method can significantly improve structuralization and digitalization level of emergency preparation plan and emergency execution plan, and can realize the seamless connection between the emergency preparation plan and the emergency execution plan.

Research progress and tendency of mine drilling rescue communication technology

ZHENG Xuezhao, WANG Hu , WEN Hu, GUO Jun

2017, 43(9): 41-45. doi: 10.13272/j.issn.1671-251x.2017.09.008

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Abstract:
The paper expounded principles of mine drilling rescue communication technology, emphatically introduced research progress at home and abroad of drilling rescue communication technology, including drilling rescue detection technology, mine rescue command system and visualization technology, high-speed transmission and exchange technology of drilling rescue, pointed out problems need to be solved of mine drilling rescue communication technology and its development tendency: each function and composition of drilling rescue communication system should be independent and organic unification, so as to guarantee normal use of other functions of the system in upgrade process;drilling rescue communication technology should have higher accuracy on links of sound and video image acquisition, environmental monitoring of disaster scene, communication and storage; the drilling rescue communication system should have functions of self-check and recovery through further improving of reliability of data communication system, so as to provide effective reference for establishment of mine rescue plan; application software matched with rescue communication equipments was perfected to ensure that rescue information is real-time interaction transmission with vivid presence to facilitate commanders to do subsequent decisions; error and error judgement and early warning technology of data acquisition system was researched to ensure accurate of rescue information and improve rescue efficiency and success.

Research on theory and key technologies of wireless through-the-earth communicatio

SUN Yanjing, WU Tianqi, SHI Wenjuan, XU Sheng, WANG Xiaolin, NIU Honghai

2017, 43(9): 46-53. doi: 10.13272/j.issn.1671-251x.2017.09.009

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Abstract:
Research status of existing wireless through-the-earth communication was comprehensively analyzed, performances of ground electrode, elastic wave and magnetic induction communication were compared, and result was got that performance of the magnetic induction communication is better than the other two kinds of communication methods. The magnetic induction communication model was emphasized, and on this basis, key technical problems and feasible solutions of the magnetic communication were put forward. Besides, design schemes of existing magnetic communication transmitter and receiver were elaborated. The future research directions of through-the-earth communication was put forward considering current studies and popular applications: large magnetic signal fading is a key factor which restricts further development of the magnetic induction communication; transmitter, receiver and transmission mechanisms of the magnetic induction communication need to be improved; through-the-earth communication system used in underground mine not only needs to control transmission power in safety range, consider compromise relationship between communication distance and transmission power, but also needs to consider how to suppress complex underground electromagnetic interference.

Numerical simulation study on optimization of technical parameters of pier column backfilling mining in Wangzhuang Coal Mine

YU Shengchao, ZHU Weibing, XU Jingmin, SHA Mengmeng, QI Xiangrui, YANG Weiming

2017, 43(9): 54-58. doi: 10.13272/j.issn.1671-251x.2017.09.010

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Abstract:
In view of mining method of pier column backfilling of No.4 thin coal seam in the seventh mining area of Wangzhuang Coal Mine, key technical parameters of the pier column backfilling mining were researched with FLAC3D numerical simulation method, influences of the technical parameters of interval, cover depth and mining height on long-term stability of the pier column backfilling body were analyzed, and conclusions were obtained that stability of the pier column backfilling are decreased with increasing of all the three influence factors. Combining with test condition of working face of the seventh mining area in Wangzhuang Coal Mine, a backfilling mining scheme was determined with elastic nuclear area proportion to define critical safe value and through interior vertical stress change to test it, namely the pier column backfilling size is 6 m×6 m and column interval is 4 m. The practical application result shows that the scheme of pier column backfilling makes goaf filling rate reduce to 30%, and the maximum surface subsidence is only 48 mm, which can effectively control surface subsidence and realize safe mining.

Research on off-line data synchronization method of measuring while drilling system

LIU Zongwei, SONG Jiancheng

2017, 43(9): 59-65. doi: 10.13272/j.issn.1671-251x.2017.09.011

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Abstract:
An off-line data synchronization method was proposed to solve the problem that attitude data of measuring while drilling system of an ordinary medium or small rotary drilling rig cannot be uploaded on-line. In the method, hole synchronizer and exploring tube at bottom of the hole are used to collect real-time drill-pipe data and attitude data of the borehole respectively during drilling process; after drilling, the synchronizer reads all the attitude data from the exploring tube, and then selects the effective measuring points to drawing trajectory by linking these selected points. Test results show that the off-line data synchronization method realizes synchronization of borehole data and attitude data, can fully meet demands of measurement while drilling of the ordinary medium or small rotary drilling rig without any change of structure of the drilling rig.

Height measurement method of hydraulic support based on multi-sensor data fusio

ZHANG Kun, LIAN Zisheng, XIE Jiacheng, LYU Kaibo, LIAO Yaoyao

2017, 43(9): 65-69. doi: 10.13272/j.issn.1671-251x.2017.09.012

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Abstract:
In view of problems that height measurement of hydraulic support on fully mechanized coal mining face was difficult and measurement result was not accurate, taking two-column shield hydraulic support as an example, expression of hydraulic support height was derived which was calculated by use of hydraulic support attitude angle measured by tilt angle sensor. In order to reduce cumulative error of hydraulic support height measurement caused by angle measurement error of the tilt angle sensor, a height measurement method of hydraulic support based on multi-sensor data fusion was proposed. The method uses batch estimation algorithm and self-adaptive weighting algorithm to fuse hydraulic support height data respectively calculated by angle measured by tilt angle sensor at shield beam or front link. The experimental results show that height measurement error of the method is not more than 0.3 mm for 623.2 mm hydraulic support prototype, and accuracy is improved 1 mm in comparison with height measurement based on single tilt angle sensor.

Optimization application of an improved genetic algorithm in coal mine distribution network planning

ZHOU Mengran, WU Leiming

2017, 43(9): 70-74. doi: 10.13272/j.issn.1671-251x.2017.09.013

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Abstract:
In view of problems of premature convergence of application of traditional genetic algorithm in distribution network planning in mining area to affect accuracy of planning, a multi-population simulated annealing and genetic algorithm was proposed. The algorithm takes the minimum year planning cost as objective function , and combines with advantage of simulated annealing algorithm, adds multi-population characteristics at the same time, so as to solve the problem of premature convergence in power distribution network planning and improve search efficiency and convenient to obtain the global optimal solution in the planning. The experimental results show that cost planning, iteration times are significantly reduced by use of multi-population simulated annealing and genetic algorithm to optimize mine distribution network, the running time is reduced by about six percent, the error rate is reduced by about three percent compared with the original algorithm, and the algorithm is more effective and efficient.

Insulation condition assessment method of mine-used transformer based on spatio-temporal information fusio

ZHANG Yuzhen, JI Xingquan, YU Yongjin, LIANG Yongliang, FAN Shuxian

2017, 43(9): 75-82. doi: 1671-251X(2017)09-0075-08DOI:10.13272/j.issn.1671-251x.2017.09.014

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Abstract:
The existing condition assessment methods of mine-used transformer mostly focus on assessment model and theory research, while neglect temporal and spatial correlation analysis of evaluation indexes. In view of the problem, an insulation condition assessment method of mine-used transformer based on spatio-temporal information fusion was proposed. In view of randomness and fuzziness of data information in the insulation condition assessment method of mine-used transformer, a multilateral condition assessment system of mine-used transformer was established. Variable weight coefficients of factors layer of evaluation model were determined introducing association rules and variable weight synthesizing theory. A fuzzy membership function was formulated to describe the factor layer, and its original basic probability assignment was calculated. The basic probability assignment of factors and cycles in evaluation model was fused based on D-S evidence theory, firstly, basic probability assignment of factors obtained by the assessment factors layer and its weight coefficient were fused based on time domain information fusion, and then the time domain fusion information was used for airspace fusion, finally insulation condition of mine-used transformers was judged combining reliability criterion. The results of practical example prove that the proposed method can evaluate the insulation condition of mine-used transformers accurately and effectively.

Fault line selection method for distribution network based on measurement of characteristic atom

ZHAO Liang, ZHOU Nuoying, WANG Xiaowei

2017, 43(9): 83-89. doi: 10.13272/j.issn.1671-251x.2017.09.015

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Abstract:
For problems that fault feature extraction was not enough and fault line selection criterion needs samples with long training time in existing fault line selection methods for distribution network, a fault line selection method for distribution network based on measurement of characteristic atom was proposed. Firstly, cosine packet and db10 wavelet are used to construct steady-state component atom and transient component atom of transient zero-sequence current, so as to form mixed atom dictionary, therefore characteristic atom of each line is extracted from the mixed atom dictionary by use of matching tracing algorithm. Then, in the aspect of energy, energy entropy is used to measure energy of the characteristic atom, and in the aspect of waveform similarity, correlation coefficient between the characteristic atom and the original transient zero-sequence current is calculated to measure similarity of waveforms, so as to get modified atomic energy entropy of each line. Lastly, comprehensive atomic energy entropy which represents physical characteristic of the each line is obtained by differential operation of the modified atomic energy entropy, and the line with the largest comprehensive atomic energy entropy is judged as fault line. The simulation results show that the method is accurate and effective with strong anti-noise interference ability, which is not affected by transition resistance, number of iterations, length of data window, compensation degree of arc suppression coil and capacitor switching.

Magnetic coupling resonant wireless power transmission system based on variable coil structure

WANG Yameng, WU Xinghua, LIN Lingyan, SONG Jiancheng

2017, 43(9): 89-95. doi: 10.13272/j.issn.1671-251x.2017.09.016

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Abstract:
For problem that transmission efficiency of traditional magnetic coupling resonant wireless power transmission system based on single coil structure was limited by transmission distance, a magnetic coupling resonant wireless power transmission system based on variable coil structure was designed. An equivalent circuit model of the system was built, relationship between transmission efficiency and transmission distance were analyzed when the system adopted two-coil and four-coil respectively, and conclusions were gotten as follows: transmission efficiency of the system with two-coil structure decreased with increase of transmission distance, and transmission efficiency of the system with four-coil structure increased first and then decreased with increase of transmission distance. According to above conclusions, a coupling resonant mode using variable coil structure was proposed, which adopted two-coil structure when transmission distance was smaller than coil radius and four-coil structure when transmission distance was larger than coil radius, so as to realize the maximization of transmission efficiency under different transmission distances. The simulation and experimental results verify effectiveness and validity of the system.

Underground positioning method based on GMapping algorithm and fingerprint map constructio

JIANG Lei, YANG Liuming, WU Fangda, HAN Huijie, ZHOU Xue

2017, 43(9): 96-101. doi: 10.13272/j.issn.1671-251x.2017.09.017

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Abstract:
In view of problems of poor accuracy and dependence on source coordinates of existing underground positioning algorithm, an underground positioning method based on GMapping algorithm and fingerprint map construction was proposed. The signal characteristics of unknown position is matched with signal distribution map, and the optimal positioning coordinates is selected, thereby improving accuracy of the underground positioning; by combining with GMapping algorithm, problem of high maintenance cost of fingerprint map construction process is avoided, and searching and matching efficiency of the algorithm is optimized. Actual test results show that the average positioning error of the proposed method is 57.7 cm, which can meet requirements of underground positioning.

Identification method of coal and rock based on information fusion and neural network

LEI Jing, YU Bin

2017, 43(9): 102-105. doi: 10.13272/j.issn.1671-251x.2017.09.018

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Abstract:
In view of problems that coal and rock identification systems use single sensor to monitor data and have low precision, reliability and stability, an identification method of coal and rock based on information fusion and neural network was proposed. A variety of necessary sensors are added to the existing shearer, which are used to collect current, pressure, vibration frequency, acceleration and other signals of the shearer under different situations. Wavelet packet is used for characteristics extraction, and BP neural network is used for data fusion, so as to achieve coal and rock identification. The test results of the real machine show that the identification error of the proposed method is within ±0.5, which verifies its validity.

Application of automatic control system of hoist in main shaft of Wutongzhuang Coal Mine

MENG Xiaola

2017, 43(9): 106-110. doi: 10.13272/j.issn.1671-251x.2017.09.019

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Abstract:
In view of problems of low carrying capacity, low safe and reliable performance and low automation control degree existed in original electronic control system of hoist of Wutongzhuang Coal Mine, a reforming scheme of automatic control system of hoist was put forward, and key technical principles were introduced including frequency-conversion speed-regulation system of motor, communication system based on field bus and safety monitoring system. The application results show that average temperature of motor stator is about 10 ℃ lower than that of the original system, average temperature of rotor decreases by about 20 ℃, and temperature measuring element and water cooling unit in stator windings all contribute to reduction of failure rate of the motor; operating speed of the hoist is up to 10 m/s, single hook running time is about 135 s, and lifting load is 25 t which meets design requirements; Profibus and multi-level system architecture were adopted, functional modules, communication interfaces, system services and system monitoring belong to different levels to ensure reliability and scalability of the system.

Development of intelligent monitoring and control system for mine ventilation safety

YANG Zhanqi, HAO Tianxuan

2017, 43(9): 110-114. doi: 10.13272/j.issn.1671-251x.2017.09.020

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Abstract:
In order to realize automatic adjustment and control of air volume during mine normal production or disaster relief, an intelligent monitoring and control system for mine ventilation safety was developed. Structure, hardware configuration and software development of the system were introduced. The system can real-timely monitor and display ventilation safety parameters, such as wind speed, gas concentration, temperature, air pressure and air volume, which can provide basis for disaster pre-warning and control. The system can also automatically adjust opening and closing state and opening degree of air door when air volume is insufficient or rich, which can meet need of air supply for ventilation location and disaster relief.

2017 Vol. 43, No. 9

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