2019 Vol. 45, No. 2

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TOF underground accurate positioning technology based on message multiplexing
CHEN Kang, WANG Jun, BAO Jianjun, WANG Wei, XU Shouquan, CHEN Nan
2019, 45(2): 1-5. doi: 10.13272/j.issn.1671-251x.2018110062
<Abstract>(150) <HTML> (11) <PDF>(11)
Abstract:
In view of problems that symmetric-double-sided two-way ranging (SDS-TWR) method had low ranging efficiency and poor expansibility and there was still room for improvement in the ranging efficiency and positioning system capacity of asymmetric-double-sided two-way ranging multi-ack(ADS-TWR-MA)method in current ultra-wideband TOF underground accurate positioning technology, a method of asymmetric-double-sided two-way ranging multi-tag multi-anchor (ADS-TWR-MTMA) was proposed. On the basis of ADS-TWR-MA method, the method further multiplexes ranging message in asymmetric-double-sided two-way ranging process, so that multiple tags and multiple anchor nodes can be used for TOF ranging simultaneously. The method greatly improves ranging efficiency and capacity of positioning system under premise of ensuring ranging accuracy. The application in locomotive proximity detection system and accurate positioning system verifies that the ADS-TWR-MTMA method is superior to SDS-TWR method and ADS-TWR-MA method in number of ranging messages, ranging time and system capacity.
Design of automatic measurement system for drill cuttings gas desorption index Δh2
MA Wenwei, LI Jiangtao, LIANG Wenxu
2019, 45(2): 6-11. doi: 10.13272/j.issn.1671-251x.2018070054
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In view of problems of many steps, low automation degree and more human interference factors in current measuring process of drilling cuttings gas desorption index Δh2 under different gas adsorption pressure conditions in laboratory, a high precision automatic measurement system for coal drill cuttings gas desorption index Δh2 based on single-chip microcomputer was designed. The system takes Atmega16 single-chip microcomputer as the core, and takes USART_HMI touch screen as input and output devices of system instructions. The single-chip microcomputer is used to operate various sensors, relays and solenoid valves to complete process of automatic degassing, adsorption, pressure relief and determination of coal samples through identifying touch screen instructions, so as to obtain final measured coal drill cuttings adsorption pressure desorption index Δh2 under different adsorption pressure conditions. The test results show that the relative error of the automatic measurement system is controlled within 5% compared with the existing coal drill cuttings gas desorption instrument,which has good practicability and data accuracy.
Mine-used mud pulse wireless measurement while drilling device and its applicatio
FANG Jun, GU Shuancheng, SHI Zhijun, LI Quanxin
2019, 45(2): 12-17. doi: 10.13272/j.issn.1671-251x.17375
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For problems of wired while drilling device (MWD) which used central cable drilling rig as signal transmission channel such as complex drilling rig structure, limited mechanical behavior, poor anti-interference performance and so on, a mine-used mud pulse wireless MWD device was developed. The device is composed of explosion-proof computer, explosion-proof keyboard, explosion-proof data memory, explosion-proof measuring tube, explosion-proof pressure transmitter, etc. It works in intermittent mode. When shutdown signal of mud pump is detected by measuring section of the explosion-proof measuring tube, static data including drilling trajectory parameter and state parameter of directional drilling tool is collected and coded. When opening signal of mud pump is detected, following works are done by driving section of the explosion-proof measuring tube including sending the static data, measuring and sending dynamic data, and controlling the pulse generator to adjust flow channel area of hydraulic conduit. The explosion-proof pressure transmitter collects pressure signal of mud pump and sends it to the explosion-proof computer. When data transmission is completed, the explosion-proof measuring tube stops working, flow channel inside the pulse generator is restored, mud pump pressure is changed to normal value, then directional drilling is started. The test result shows that the device runs stably with correct measurement data and improves efficiency and safety of directional drilling, which can meet directional drilling need of all kinds of coal-seam or rock-seam drilling holes and realize measurement while drilling of traditional drilling trajectory.
Design of a high-performance mine-used intrinsically safe power supply
HUANG Hesong, CHEN Xi, TIAN Chengjin, FU Zhen
2019, 45(2): 18-23. doi: 10.13272/j.issn.1671-251x.2018080008
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For problems of poor electromagnetic immunity and weak load capacity of current intrinsically safe power supply, a high-performance mine-used intrinsically safe power supply was designed. The power supply is based on quasi-resonant flyback switching power supply and dual overvoltage and overcurrent protection, which can convert AC85-250 V wide input voltage into stable DC12 V/2 A output. The test results show that the power supply has small ripple, high efficiency and strong electromagnetic immunity, which meets intrinsic safety performance requirements of GB 3836.4-2010 Explosive Atmospheres Part 4: Equipment Protection by Intrinsic Safety "i".
Research progress of mine drilling rescue detection robots
MA Hongwei, MA Kun, TIAN Haibo
2019, 45(2): 24-29. doi: 10.13272/j.issn.1671-251x.2018010010
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The paper analyzed research status of rescue drilling technology, coal mine rescue detection robot and mine drilling rescue detection robot at home and abroad. It pointed out that using the research achievements of the coal mine rescue detection robot and pipeline robot combined with detection requirements of mine rescue drilling can develope the mine rescue drilling detection robot which meet the requirements of mine application, and improve rescue success rate of mine disaster. It also analyzed key technologies and development trend of mine rescue drilling detection robot in items of mobile mechanism, navigation, location and path planning, sensor detecting, communication and control mode, energy supply and explosion-proof performance. Meanwhile, it put forward that innovative design should be done on mobile mechanism, energy supply and explosion-proof performance around trafficability characteristic, reliability, lightweight, intelligentization of robot, so as to improve detection range and accuracy of the sensor; and intelligent algorithms of navigation, location and control in unknown and unstructured environment should be researched, so as to improve the environmental adaptability of the robot.
Research on architecture of coal mine cyber-physical system and its sensing and control node
ZHANG Mei, NIU Shihui, LI Jingzhao
2019, 45(2): 30-34. doi: 10.13272/j.issn.1671-251x.2018090075
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In order to solve problem of failure to realize information sharing and coordinated control among subsystems of coal mine safety production, an architecture of coal mine cyber-physical system was proposed, which was composed of perceptual execution layer, network transmission layer, cognitive processing layer and application control layer. The perceptual execution layer realizes ubiquitous perception and control for human, machine, material and environment through sensing and control node. The network transmission layer not only combines backbone network and sub-network, but also combines wired network and wireless network, so as to realize reliable and efficient information transmission. The cognitive processing layer consists of a large number of distributed computing devices to achieve information fusion and analysis, data mining and big data analysis. The application control layer provides communication interface for users to realize centralized monitoring and coordinated control of each link in coal mine. According to characteristics of the sensing and control node in coal mine cyber-physical system, model of the sensing and control node was established by use of BDI model. Autonomous state, autonomous control and autonomous behavior of the sensing and control node are described by belief, goal and plan. Several goals are generated and allocated according to reasoning based on perceptual event and belief library, then plan is refreshed by current belief and plan library, which causes corresponding behavior is executed and belief and goal are modified.
Research on application of fast roaming and Mesh network technology of WiFi communication on fully mechanized coal mining face
GAO Siwei, LI Se
2019, 45(2): 35-40. doi: 10.13272/j.issn.1671-251x.2018050088
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At present, there are problems about few application research of WiFi communication in the specific environment of fully mechanized coal mining face, propagation characteristics of WiFi signal on the fully mechanized coal mining face were analyzed combined with wireless signal spatial propagation theory. The analysis results show that on the fully mechanized coal mining face, the WiFi signal propagation is greatly affected, especially the signal coverage is obviously reduced; the WiFi signal propagation on the fully mechanized coal mining face conforms to log-distance path loss model. According to the spatial layout characteristics of fully mechanized coal mining face, an optimal technical scheme of no-dead zone and full coverage WiFi communication network of fully mechanized coal mining face was constructed by fast roaming technology and Mesh network technology. The test results show that the scheme can solve the problem of video communication on the shearer, and realize fast roaming function of WiFi network, can effectively ensure the application effect of the mobile terminal, and the average communication throughput of the whole network is about 35 Mbit/s, the minimum communication throughput is about 7 Mbit/s, which can meet most of the communication needs on fully mechanized coal mining face.
Determination of advancing distance of sealing hole for water-releasing borehole in working face floor
HU Ru, WU Jiwen, ZHAI Xiaorong, HU Jie, JIANG Tao
2019, 45(2): 41-46. doi: 10.13272/j.issn.1671-251x.2018040088
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In order to decrease the influence of advancing abutment pressure on water-releasing borehole around working face during mining process, it is necessary to research advancing distance of sealing hole of water-releasing borehole in floor. An engineering geological model was established taking Ⅲ610 isolated working face of Yangzhuang Coal Mine as an example, and influence range of advancing abutment pressure of the working face during mining process was researched by use of FLAC3D numerical simulation software. The simulation result shows that the influence range is 20-30 m. The influence range of advancing abutment pressure was also theoretically calculated with a result of 29.81 m when considering repeated mining influence, which was basically consistent with the numerical simulation result. According to results of numerical simulation, theoretical calculation and field test, advancing distance of sealing hole of water-releasing borehole in floor of Ⅲ610 isolated working face is determined as 30 m, and its rationality was verified by practice.
Monitoring method of recovery state of hydraulic support guard plate based on image recognitio
WANG Yuan, LI Hongwei, GUO Wei, HE Haitao, JIA Gaoxiang
2019, 45(2): 47-53. doi: 10.13272/j.issn.1671-251x.2018070037
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In view of problems of high failure rate and easy to be affected by incline of shearer in the application of contact-type monitoring method of hydraulic support in environment of mine fog and dust, a monitoring method of recovery stae of hydraulic support guard plate based on image recognition was proposed. The method uses fog dust image sharpening algorithm and machine vision measurement method to carry out monitoring of recovery angle of the guard plate of the hydraulic support, and determines the recovery state of the guard plate of the hydraulic support by measuring the angle of the guard plate. Firstly, an improved dark channel prior algorithm and a multi-scale Retinex algorithm with guided filtering are adopted to defog the captured image, and then wavelet fusion is carried out on the defogging image, focusing on restoring the edge details of the image of fog and dust. Then, the region of interest (ROI) of the fusion image is extracted, binarized and processed by horizontal and vertical projection with machine vision measurement method, the skeleton and skeleton pixel points are extracted and generated into straight lines by fitting, coordinate transformation is carried out by the calibrated CCD camera to output true angle of the guard plate, so as to judge whether the guard plate is recovered. The experimental results show that the method realizes sharpening process of images with fog and dust in underground coal mine, and keep the detail of the image, and has accurate measurement result, and the synthetic error is less than 2°, which meets monitoring requirements for the guard plate.
Analysis of lump coal rate on fully mechanized coal mining face based on discrete element method
CHEN Li, ZHANG Yan
2019, 45(2): 54-59. doi: 10.13272/j.issn.1671-251x. 2018080043
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In view of problem that existing lump coal rate research method cannot accurately express behavior of coal particles, an analysis method of lump coal rate on fully mechanized coal mining face based on discrete element method was proposed. Taking MG450/1080-WD type shearer as research carrier, the coal mining process was studied and analyzed, and dynamic model of coal rock particles was established. On this basis, discrete element software EDEM was used for quadratic regression orthogonal rotation combination test, and lump coal rate of the fully mechanized mining face was analyzed. The analysis results show that when drum speed is 38.74 r/min, hub diameter is 233.79 mm, and blade spiral angle is 14.09°, performance of MG450/1080-WD shearer is optimal, the lump coal rate is 36.52%. Simulation and test results of lump coal rate under different rotation speeds and blade spiral angles are compared, and the results show that the trend of lump coal rate is consistent, which proves the feasibility of using discrete element method to analyze lump coal rate of fully mechanized mining face.
Pre-charging control strategy of modular multilevel inverter
ZHU Qixian, QI Gang, WEI Yongwu, WANG Xinggui
2019, 45(2): 60-64. doi: 10.13272/j.issn.1671-251x.2018080031
<Abstract>(59) <HTML> (9) <PDF>(6)
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According to operation characteristics of mine hoist, a back-to-back modular multilevel converter composed of modular multilevel rectifier and modular multilevel inverter was used for control of mine hoist. In view of current research on pre-charging control for modular multi-level inverter through DC side was less, a pre-charging control strategy of modular multilevel inverter was proposed. Charging state of sub-module is controlled by controlling charging current, so that capacitor of the sub-module can be charged to meet voltage requirement of the modular multilevel converter in stable operation. Meanwhile, charging current and overvoltage generated in charging process are limited to safe range and charging time is the shortest. The simulation results verify effectiveness of the control strategy.
Influence of insulation resistance asymmetry of mine power cable on AC stray current distributio
ZHANG Min, WU Xinghua, GENG Pulong, SONG Jiancheng, NIU Honghui, TIAN Dexiang
2019, 45(2): 65-69. doi: 10.13272/j.issn.1671-251x.2018080001
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Taking AC power supply system of a mine as research object and combining possible circulation path of AC stray current, a mine AC stray current model was built based on analysis of generation mechanism of mine AC stray current. Distribution laws of AC stray current under different unbalance coefficient of insulation resistance of high voltage or low voltage cable were researched by Matlab/Simulink simulation. The research results show that when insulation resistance of high voltage or low voltage cable is asymmetry, the generated AC stray current mainly distributes in shielding or ground wire and metal net in asymmetry section of insulation resistance. When insulation resistance of the entire cable is asymmetric, AC stray current increases continuously in return path to power grid. With the increase of unbalance coefficient of insulation resistance, effective value of AC stray current flowing through shielding or ground wire, metal net and each ground electrode all increases.
Performance prediction method for large-centrifugal ventilator
SUN Tao, DAI Bangwu, CHU Fei, MA Xiaoping
2019, 45(2): 70-74. doi: 10.13272/j.issn.1671-251x.2018100014
<Abstract>(77) <HTML> (14) <PDF>(10)
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In view of problems that existing performance prediction methods for centrifugal ventilator cannot fully utilize historical operation data of centrifugal ventilator and have long modeling period, performance prediction method for large-centrifugal ventilator based on LSSVM and LHS was proposed. Outlet pressure is selected as index to measure performance of ventilator, and performance prediction model of centrifugal ventilator is established by using LSSVM. Inlet temperature, inlet pressure, inlet flow rate and rotational speed of the centrifugal ventilator are collected by LHS method, and the collected data are normalized for training of LSSVM model. Validity of the established model is verified by testing data. The simulation results show that the performance prediction method for large-centrifugal ventilator based on LSSVM and LHS can make full use of existing ventilator data information to quickly and accurately predict performance of ventilator.
Health diagnosis method of coal mine belt conveyor
QI Ruimin, WANG Xin
2019, 45(2): 75-78. doi: 10.13272/j.issn.1671-251x.2018080012
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In view of problem of invalidation in dealing with conflicting evidence of D-S evidence theory used in health diagnosis method of coal mine belt conveyor based on multi-sensor information fusion, a health diagnosis method of coal mine belt conveyor based on fuzzy evidence theory was proposed. Firstly, information of belt conveyor are collected by use of multi-sensor, and basic probability assignments are obtained according to membership function, so as to extract information feature. Then information fusion based on fuzzy evidence theory is realized by modifying conflicting evidence and applying synthesis rule of D-S evidence theory. Finally, running state of belt conveyor is judged according to decision rule. Effectiveness of the method is verified by an example.
Research on dynamic characteristics of variable frequency drive hydraulic winch system
DING Ga
2019, 45(2): 79-84. doi: 10.13272/j.issn.1671-251x.2018090007
<Abstract>(93) <HTML> (12) <PDF>(8)
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A closed-loop control simulation model of variable frequency drive hydraulic winch system was built using AMESim, and the dynamic characteristics of the hydraulic winch system under different load mutations were simulated and analyzed using the model. The simulation results show that the variable frequency drive hydraulic winch system can realize accurate control of drum speed. In the process of no-load and on-load start-up, the lifting speed of the drum can reach the target speed after short-term fluctuation, and the final deviation between the actual displacement of the drum and the target displacement in two cases is not more than 0.1 m. Under the start-up with load, the variable frequency drive hydraulic winch system has good response and tracking characteristics to speed step and sinusoidal changes, and the drum speed of winch is insensitive to the change of load, and the speed stability with load is good.
Low loss control of explosion-proof frequency converter based on model predictive control
CAO Xiaodong, YANG Shihai, JI Feng, YE Zongbin
2019, 45(2): 85-90. doi: 10.13272/j.issn.1671-251x.2018100008
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In view of problem that traditional vector control method is difficult to carry out active heat management for explosion-proof frequency converter, a low loss control method for explosion-proof frequency converter based on model predictive control was proposed. Heat loss model of the explosion-proof converter was established, and conduction loss and switching loss of power devices were deduced and analyzed, and pointed out that the key of low loss control is to reduce the switching frequency. Based on framework of model prediction control system, high-precision prediction model suitable for low-loss control requirements of explosion-proof converter was designed, and then rolling optimization calculation was completed based on value function considering loss characteristics. The proposed method is analyzed and verified based on 1 140 V/2 MW explosion-proof frequency conversion test prototype, the results show that the method can realize multi-objective optimization problem of explosion-proof frequency converter under constraint condition, and rationally allocate multiple optimization objective weight coefficients, and effectively reduce the overall loss of the system under the condition of satisfying dynamic and steady-state performance requirements of explosion-proof frequency converter.
Experimental research on coal slime flotation process based on orthogonal test desig
CHEN Peng, WANG Chengyong, SHI Kaiyi, JI Yonghua, SUO Peidie, LIU Yuanli
2019, 45(2): 91-95. doi: 10.13272/j.issn.1671-251x.2018050097
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Coal slime content and ash content is high in Wangjiazhai Coal Preparation Plant, in -0.5 mm graded coal slime mixed flotation process, it often appeared coarse or fine mud entrainment phenomenon. In order to fully recover combustible materials in the coal slime, the properties of coal slime in this plant were analyzed by slime sieving test, float and sink test and step release test, and three flotation processes of coal slime mixed flotation, classification flotation and secondary flotation were tested and studied by orthogonal experimental design method. The results show that the secondary flotation process is the most suitable for coal slime flotation in the plant, which can effectively reduce influence of high ash fine slime on cleaned coal and the ash content of the flotation cleaned coal. The optimum flotation conditions of the plant are coal slime concentration of 80 g/L, kerosene consumption of 240 g/t and No.2 oil consumption of 120 g/t, improved flotation index of 45.63, flotation cleaned coal yield of 69.93%, ash content of 11.88%, the primary and secondary relationship of each factor is No.2 oil consumption > coal slime flotation concentration > kerosene consumption.
Research on evaluation model of comprehensive condition for mine-used hydraulic support
HOU Gang
2019, 45(2): 96-100. doi: 10.13272/j.issn.1671-251x.17336
<Abstract>(41) <HTML> (7) <PDF>(6)
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In view of problem that existing hydraulic support monitoring system had not realized comprehensive monitoring and evaluation of conditions of hydraulic support, evaluation model of comprehensive condition for hydraulic support was established.Through attitude sensors installed on top beam, front connecting rod and base of the support, angles between top beam and horizontal plane, front connecting rod and horizontal plane, base and horizontal plane were collected. Mining height, total length of column, total length of balance cylinder was calculated according to the evaluation model. Comprehensive evaluation of support conditions was achieved by analysis of attitude and force state of hydraulic support.
A mine-used DC chopper test platform based on energy self-circulation mode
ZHANG Song, GUO Lifang, LI Yufei, WANG Yuanbo, PENG Hongling
2019, 45(2): 101-104. doi: 10.13272/j.issn.1671-251x.2018080017
<Abstract>(52) <HTML> (14) <PDF>(5)
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For problems of large ripple of power supply, difficult selection of high-power load, low test efficiency and high test energy consumption existed in existing DC chopper test platform, a mine-used DC chopper test platform based on energy self-circulation mode was proposed. The platform uses three-phase transformer, three-phase uncontrolled rectifier circuit, Buck circuit and constant voltage and current limiting control strategy to achieve adjustable voltage source output voltage of 0-750 V, and adopts Boost circuit and constant current strategy to realize energy self-circulation load output current of 0-240 A, so as to realize large-scale adjustment of voltage and current and improve test efficiency. Meanwhile, output energy from the energy self-circulation load is fed back to output end of the adjustable voltage source to realize energy self-circulation and reduce test energy consumption. The simulation and experimental results verify effectiveness of the platform.
Remote fault analysis platform of coal mine monitoring system
GAO Wen
2019, 45(2): 105-108. doi: 10.13272/j.issn.1671-251x.2018110029
<Abstract>(90) <HTML> (7) <PDF>(7)
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For problems of low time-efficiency of fault process, heavy on-site maintenance workload and high cost of operation and maintenance of coal mine monitoring system, a remote fault analysis platform of coal mine monitoring system was designed based on unified specification of fault information. The platform is divided into device layer, network layer, system layer and operation and maintenance layer. Fault probe with self-diagnosis capability is built into the device layer. After fault is detected by the fault probe, relevant information is cached and uploaded to the network layer. The network layer caches the fault information from the device layer, and then packs and uploads it to the system layer with the fault information generated by the network layer. Fault information acquisition software deployed in the system layer can obtain fault information from upper computer software of monitoring system by means of memory interface, database or text file. Meanwhile, it supports direct acquisition of fault information of equipment in the network layer and transfers the cached fault information to the operation and maintenance layer. The operation and maintenance layer stores received fault information into fault information center library for analysis and push. The platform can provide important data support for fault analysis of coal mine monitoring system and effective technical support for operation and maintenance of coal mine monitoring system.

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