2018 Vol. 44, No. 2

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Cloud computation and platform technology for mine Internet of things
LU Xinming, KAN Shuting, ZHANG Xingli
2018, 44(2): 1-5. doi: 10.13272/j.issn.1671-251x.17308
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Abstract:
It was pointed out that cloud computation and platform technology was core of system of mine Internet of things. Technical objectives and main functions of the cloud computation platform of mine Internet of things were introduced. Key technologies of the cloud computation platform of mine Internet of things were expounded including platform architecture based on cloud interaction data pipeline, intelligent resource management and control model and load balancing algorithm, task scheduling and resource dispatching scheme, real-time and heterogeneous data exchange of mine, quick coding and sending in the batch of control command, quick data extraction and packing in the batch, and mine application oriented pushing. Research method and technical route of each technology were given. The paper lays a technical foundation for building a complete, advanced and universal cloud computation platform of mine Internet of things.
Innovation progress and prospect on key technologies of intelligent coal mining
WANG Guofa, FAN Jingdao, XU Yajun, REN Huaiwei
2018, 44(2): 5-12. doi: 10.13272/j.issn.1671-251x.17307
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Abstract:
Innovation and practice were summarized overall about intelligent fully mechanized coal mining in thin coal seam and thinner coal seam, intelligent fully mechanized coal mining of large mining height and super large mining height in thick coal seam, and intelligentization technology of fully-mechanized top coal mining in super thick coal seam, and shortcomings of the above technologies were analyzed. Five key technologies were proposed for fully mechanized coal mining equipments to adapt to surrounding rock movement and dynamic environment variety, which were intelligent height adjustment control of shearer, intelligent coupling self-adaptive control of hydraulic support units and surrounding rock, intelligent alignment control of working face, cooperative control based on multi-information fusion and intelligent control of advance support and assistant operation. The key technologies lay technical base for intelligent mining progressing to senior stage of self-learning, self-decision-making and self-adjustment from current initial stag. Technical development directions and targets of coal industry in the short term, medium term and long term were proposed, namely intelligent mining, limited unmanned mining and fluidized mining, and development route, key technologies and development direction were also prospected.
Optimal design of balance jack control loop of hydraulic support
CAO Lianmin, SUN Shijiao, ZHANG Zhen, ZHANG Yazhu, GUO Hui, YAN Mingwei, GUO Zhen, ZHONG Chongtao
2018, 44(2): 13-18. doi: 10.13272/j.issn.1671-251x.2017070021
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Abstract:
Principles and shortcomings of balance jack control of hydraulic support by use of compensation valve, high pressure internal overflow valve, floating two-way lock and automatic balance valve respectively were analyzed, and an optimal design scheme of the balance jack control loop of hydraulic support was proposed according to pressure characteristics of the balance jack cavity. Automatic fluid replacement and unloading of the balance jack cavity are realized by reasonably disposing components such as hydraulic pressure controlled reversing valve and low pressure unloading valve, so as to solve problem of safety valve frequently opening under non-emergency situation. The simulation and test results verify effectiveness of the optimal design scheme.
De-noising method of mine gas monitoring data
LIANG Rong, DONG Dingwen
2018, 44(2): 18-22. doi: 10.13272/j.issn.1671-251x.17288
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Abstract:
In order to solve problem of easily eliminating effective signal component of mine gas monitoring data by wavelet de-noising, a de-noising method of mine gas monitoring data based on Hilbert-Huang transform was proposed. Original gas monitoring data sequence is decomposed into a set number of intrinsic mode function components by using empirical mode decomposition, and marginal spectrum is obtained through Hilbert transform. Correlation between the original sequence and each intrinsic mode function component is analyzed according to amplitude frequency relationship in the marginal spectrum between the original signal and each intrinsic mode function component, so as to determine and eliminate noise signal sequence. The case analysis shows that characteristics of the gas monitoring data is clear in time scale by empirical mode decomposition, which is good for identifing high frequency noise of the signal easily. The high frequency noise of gas monitoring data is eliminated through Hilbert spectrum analysis, and intrinsic characteristic of the original gas monitoring data is retained, which avoids signal distortion while de-noising is achieved, and maintains authenticity of the gas monitoring data.
Design of intelligent miner lamp based on embedded real-time operating system
ZHANG Di, DONG Fei, GAO Bin, ZHAO Duan, DING Enjie
2018, 44(2): 23-27. doi: 10.13272/j.issn.1671-251x.2017090026
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Abstract:
In view of problems of being unable to sense underground environment parameters and failing to form two-way real-time communication network between underground and ground caused by single function of miner lamp , an intelligent miner lamp based on embedded real-time operating system was designed. The lamp takes STM32 chip as main control center, and collects environmental temperature, gas concentration and personnel movement status by using temperature sensor, gas sensor and acceleration sensor respectively. The NRF24L01 wireless communication module reads status of underground positioning and material label to obtain personnel position and material information; data is uploaded to the ground server via WiFi for display and storage. The lamp has both manual alarm and automatic alarm functions, the host computer can send information to achieve two-way communication between underground and ground. Test results show that the intelligent miner lamp is stable and reliable, easy to operate, and has high real-time performance.
Design of remote multi-cylinder synchronous control system of hydraulic support test bench
SHA Baoyin
2018, 44(2): 28-31. doi: 10.13272/j.issn.1671-251x.2017090054
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Abstract:
In order to solve problem of remote four-cylinder synchronous control of active platform and vertical external loading platform of 30 000 kN hydraulic support test bench, a remote multi-cylinder synchronous control system of hydraulic support test bench based on PXI platform and LabVIEW RT was designed. High frequency electro-hydraulic proportional directional valve is adopted as actuating element of hydraulic system of high lift cylinder, and high precision displacement sensor is used as feedback element of real-time closed loop system. Synchronization of the high lift cylinder is achieved by running fuzzy PID control algorithm in embedded real-time controller and real-time adjustment of opening of the proportional directional valve. The practical application shows that the maximum four-cylinder synchronization error of the system is 0.91 mm and the minimum error is 0.63 mm during the lifting process of movable platform of the hydraulic support test bench.
Research on stabilized pressure hydraulic fluid supply technology adapted to hydraulic support actio
WANG Ranfeng, FU Xiang, ZHAO Yangsheng, HUANG Guangping
2018, 44(2): 32-38. doi: 10.13272/j.issn.1671-251x.17289
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Abstract:
In order to improve ability of hydraulic support following shearer in working face, coupling relationship among support action velocity, hydraulic system pressure and flow rate of hydraulic fluid supply was revealed by theory analysis of support hydraulic fluid supply process. Simulation model of hydraulic system on working face was established and correctness of the model was verified. Effect of hydraulic system pressure and flow rate on support action velocity was analyzed, and a stabilized pressure hydraulic fluid supply technology adapted to support action was proposed. The technology takes support action type and hydraulic system pressure limitation as criterion, and realizes slow and steady changing process of hydraulic system pressure with slight rise during support action by adjusting flow rate, so as to improve support action velocity. The technology was tested by use of multi-pump and multi-frequency hydraulic fluid supply system, and validity of the technology was verified.
Design of health condition monitoring system of mine hoisting equipment
CHANG Yonggen, JIANG Fan, CHEN Xiao
2018, 44(2): 38-42. doi: 10.13272/j.issn.1671-251x.2017090029
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Abstract:
In view of problem that health condition monitoring system of existing mine hoist equipment uses a single signal for condition monitoring which easily leads to misjudgment, health condition monitoring system of mine hoisting equipment based on signal fusion was designed. The system collects spindle torque signal, bearing vibration signal and wire rope tension signal during operation of mine hoisting equipment respectively. The signal fusion method of decision level was used to calculate and fuse in host computer, and fusion judgment result was displayed. The test results show that the system can effectively monitor health condition of mine hoisting equipment.
Research status and development trend of mechanism and simulation test of coal and gas outburst
LIU Yejiao, YUAN Liang, XUE Junhua, TIAN Zhichao, DUAN Changrui, CHEN Benliang
2018, 44(2): 43-50. doi: 10.13272/j.issn.1671-251x.2017060062
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Abstract:
Theoretical research status of mechanism of coal and gas outburst was summarized. Typical examples of similar materials of gas-bearing coal and simulation experiment device of coal and gas outburst were analyzed. Deficiency of the research of mechanism of coal and gas outburst and simulation experiment was pointed out，namely, theory research results of mechanism of coal and gas outburst are more qualitative description, lack quantitative, unified and complete theoretical system; the existing outburst simulation test systems and devices can not accurately simulate the outburst phenomena under the influence factors of geological structure, ground stress, coal strength, gas content and construction process, and the accuracy of the mechanical loading system, gas filling system and testing system of the test equipment needs to be further improved; the experimental operation and convenience of the test instrument are not enough, and the reproducibility of the test needs to be improved; the data analysis system of test instruments is not perfect. The development trend of mechanism research of coal and gas outburst and simulation experiment was prospected: the simulation experiment of coal and gas outburst must conform to the similarity theory, and the research of simulation test instrument of coal and gas outburst is an urgent demand for the breakthrough of mechanism research.
Status and development trend of mine positioning technology
HUO Zhenlong
2018, 44(2): 51-55. doi: 10.13272/j.issn.1671-251x.17309
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Abstract:
Common mine positioning technologies were analyzed from aspects of positioning methods and wireless communication technologies, and application of the mine positioning technologies in personnel positioning system and equipment proximity detection were described. It was pointed out that future mine positioning system or equipment would comprehensively utilize technologies such as wireless ultrahigh frequency ranging, inertial navigation, multi-source hybrid positioning and multi-source information fusion to form a positioning service system oriented service, so as to realize accurate positioning of underground personnel and equipment, proximity detection of large mobile device and personnel, and autonomous navigation and positioning of mining equipment and underground rescue personnel (robot).
Numerical simulation study on influence of gangue on coal seam gas drainage
LIU Quanlin, WANG Enyuan, LI Zhonghui, KONG Xiangguo
2018, 44(2): 55-62. doi: 10.13272/j.issn.1671-251x.2017100046
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Abstract:
In order to solve problem of reasonable arrangement of gas drainage borehole in coal seam containing gangue, a solid-gas coupling model of gas drainage was deduced with initial and boundary conditions by establishing control equation of coal and rock deformation, control equation of gas migration and evolution equation of porosity and permeability. Distribution laws of gas pressure, permeability and displacement deformation of coal body around single borehole were numerical simulated and analyzed by use of multiphysics field analysis software COMSOL Multiphysics combining with actual geological conditions of IV13 coal seam of a mine. Hole spacing of gas drainage boreholes in coal seam containing gangue was also determined, which provided basis for optimal arrangement of drainage boreholes in coal seam containing gangue. The research results show that during gas drainage process, along with decrease of distance between coal body and borehole, falling range of gas pressure and rising range of permeability of coal body around borehole are the minimum, and displacement of coal body around borehole is the maximum when coal seam contains no gangue; falling range of gas pressure and rising range of permeability of coal body around borehole are the maximum, and displacement of coal body around borehole is the minimum when borehole does not cross gangue.
Design of equipment continuously loading and unloading drill rod on gas drainage drilling rig
WU Binbo, GUO Wenliang, KOU Ziming, GONG Xiaoqin, XIN Yupeng
2018, 44(2): 63-67. doi: 10.13272/j.issn.1671-251x.2017070019
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Abstract:
For the problem that existing gas drainage drilling rig usually caused coal particles to heap in drilled hole, hole wall to collapse and further accidents such as drill rod fracturing, drilling tool losing, drilled hole being unavailable and so on because of frequent start-stop, a new type of equipment continuously loading and unloading drill rod on gas drainage drilling rig was proposed. The whole design scheme of the equipment as well as working process of drill rods connecting one by one were focused on. The equipment has structural components including former and rear power heads, speed measuring device, clamping positioning device, feeding equipment, etc. ,which can realize continuously connecting to the next drill rod without drilling stopping, so as to reduce the damage to drilled hole wall caused by frequent start-stop of the drill. The mechanical property analysis results of the equipment based on ABAQUS element software show that the key structural components of the equipment such as pedestal, guideway and so on have high safety coefficient and meet application requirements.
A line selection method for single phase ground fault in coal mine power supply system based on wavelet packet
LUO Chao, GENG Pulong, QU Bingni, SONG Jiancheng, LIU Jucai, DU Zhili, YUAN Leiming
2018, 44(2): 68-74. doi: 10.13272/j.issn.1671-251x.2017050003
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Abstract:
In view of problems of low accuracy and poor reliability of line selection methods for single phase ground fault in existing coal mine power supply system, a line selection method for single phase ground fault in coal mine power supply system based on wavelet packet was proposed. At first, transient zero modal current of each line is decomposed by wavelet packet, the lowest frequency band containing steady power frequency is eliminated, and sum of wavelet packet energy of each frequency band is calculated and sorted. And then, characteristic frequency band of each line is selected based on principle of the maximum energy, the line with opposite polarity is identified as fault line by comparing polarities of the modulus maximum of the wavelet packets decomposition coefficients of characteristic frequency band of lines. The double criteria for fault line selection of single phase ground fault can be formed by the different characteristics of transient zero modal currents between fault line and non-fault line, which overcomes the problem that single criteria may not select fault line correctly. The simulation experiments results prove correctness and effectiveness of the method.
Underground adaptive positioning algorithm based on PSO-BP neural network
CUI Lizhen, XU Fanfei, WANG Qiaoli, GAO Lili
2018, 44(2): 74-79. doi: 10.13272/j.issn.1671-251x.2017090028
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Abstract:
A kind of underground adaptive positioning algorithm based on PSO-BP neural network was proposed. In view of the problem that traditional positioning algorithm based on ranging model is sensitive to coal mine environment disturbance and ranging error is large, a fingerprint matching positioning model is selected for positioning. In view of the problem that strong time-varying nature of coal mine environment is easy to increase matching error between the fingerprint information collected in real time and the static fingerprint database information established in offline phase, the beacon node is used as calibration node to better reflect the condition of reference point changes with environment, and avoid adding additional calibration nodes. The dynamic compensation method is used to correct the fingerprint data of the target node in real time without increasing the hardware cost, which solves the problem of poor adaptation of the fingerprint matching positioning model. At the matching positioning stage, PSO is used to optimize weight of BP neural network to accelerate convergence of BP neural network and improve learning speed. The experimental results show that the algorithm is more adapted to the coal mine environment varies with time, and meets the requirement of adaptive underground positioning.
Design of automatic control system of hydraulic winch
WEN Yi, ZHANG Yaocheng
2018, 44(2): 80-83.. doi: 10.13272/j.issn.1671-251x.2017080038
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At present, most of hydraulic winches adopt open-loop manual control and simple PID closed-loop control method, operation smoothness of the hydraulic winch depends on the driver's experiences, so as to cause low automation degree of the winch and great working intensity for operators. In order to solve the above problems, a kind of automatic control system of hydraulic winch was designed. The system uses coordinated control between single-chip microcomputer and PID controller to adjust speed of the hydraulic winch. The single-chip microcomputer can automatically judge running state of the winch after receiving target speed, and then control opening of hydraulic valve; by splitting the target speed, the single-chip microcomputer can automatically adjust the speed of drum to the target speed with collaborative PID controller, which improves automation level of operation of the winch. The simulation results verify reliability of the system.
Far-field seismic source positioning method based on improved GA algorithm
LI Yue, CHEN Qing, DING Enjie, CHENG Long
2018, 44(2): 84-89. doi: 10.13272/j.issn.1671-251x.2017090042
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Abstract:
In view of problem that positioning accuracy drops sharply when seismic source is placed in far-field, a far-field seismic source positioning method based on improved GA algorithm was proposed. The improved GA algorithm makes use of fast convergence speed of quasi-Newton method and global search of GA algorithm to realize seismic source positioning. Simulation results show that the improved GA algorithm runs about three times faster than the GA algorithm. In view of problem that positioning accuracy of y-axis cannot be guaranteed due to uniaxial arrangement of sensors, it was proposed to change the position of the sensors to two axes and set independent sub-objective functions on both axes to minimize the biaxial error. Analysis results show that the new objective function converges faster and runs more stably, and can effectively improve y-axis positioning accuracy.
Research on tension device and its tension control system of belt conveyor
JIE Shijun, XIONG Xiaoyan, WU Bing, LIU Diandia
2018, 44(2): 90-95. doi: 10.13272/j.issn.1671-251x.2017090034
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In view of problems of nonlinearity, large inertia, hysteresis and time variation of tensioning system of belt conveyor, a mathematical model of tension device was established, and it was proposed to connect a correction links in series to eliminate system shocks; it was proposed to combine dynamic matrixcontrol with PID control to design tension control system for tension device of belt conveyor, making good use of advantages of strong anti-jamming ability of PID control and good adaptability to inertia and retardation of dynamic matrix. AMESim/Simulink was used to model mechanical hydraulic and control algorithm of belt conveyor. The simulation analysis results show that under serial control of dynamic matrix and PID, the tension control system of the tension device of belt conveyor is robust to time-delay and variable-structure, has low peak tension, and can precisely track tension settings.
Design of a mine-used switching power supply
LIN Yin
2018, 44(2): 95-99. doi: 10.13272/j.issn.1671-251x.2017070020
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For problems of existing mine-used switching power supply such as large harmonic current, low power factor and so on, a mine-used switching power supply was designed by use of technologies of active power factor correction and resonant soft switching. Design indexes of the power supply were introduced as well as design scheme of its hardware circuits. The test results show that under conditions of inputting AC170 V and outputting full load, the inputting current of the power supply has no pulse and little harmonic current; the max temperature of main components of the power supply is 98.5 ℃ when environmental temperature is 50 ℃; when input voltage is AC90~265 V, power factor of the power supply is not less than 0.96, ripple voltage is less than 30 mV, and efficiency is 86.5%; in test of insulation withstand voltage, insulation resistance is not less than 50 MΩ, and leakage current is less than 1 mA.
Application of construction organization design in the sixth fire area of Nanshan coal field fire area in Shihezi
BAO Xingdong, CAO Fei
2018, 44(2): 99-105. doi: 10.13272/j.issn.1671-251x.2017060092
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In view of the problems of unreasonable planning, greater artificial influence factors existed in existing management method of coal fire area because of lacking of construction organization plan, taking the sixth fire area of Nanshan coal field fire area as research object, a management scheme of coal field fire area applied construction organization design was put forward. Integrated control scheme including stripping，drilling,water injection and grouting, covering and vegetation recovery of the fire area was determined based on combusting situation and fire extinguishing conditions in the fire area, construction preparation, construction scheme and methods of various kinds of construction were expounded in detail, the construction schedule planning, quality and safety guarantee measures were drawn up, so as to ensure management achievement and progress of the fire area. The practical experience applied construction organization design in management of coal field fire area was obtained through successful management of the fire area, which has certain reference value for scientific management of the coal field fire area.
Design of fiber grating sensor for steel wire rope tension measurement of mine hoist
WANG Detang, LI Haiwei, WANG Gonghua, XU Chuanhong, MENG Xiangru, ZHANG Hongguang
2018, 44(2): 106-110. doi: 10.13272/j.issn.1671-251x.2017080024
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In view of problems of low reliability, poor moisture resistance and short service life existed in electronic sensor applied in steel wire rope tension measurement of mine hoist, a fiber grating sensor was designed. The sensor uses dual-gate structure, and adopts differential compensation method to eliminate impact of temperature; it uses grating detection device to detect center wavelength offsets of fiber grating, so as to calculate pressure of the sensor according to linear relationship between the center wavelength offsets and pressure, namely the tension of the steel wire rope. The experimental and test results verify reliability of the sensor.

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