工矿自动化

Design of drilling parameters monitoring system of directional drilling rig in coal mine tunnel

FANG Peng

2019, 45(1): 1-5. doi: 10.13272/j.issn.1671-251x.2018080052

<Abstract>(79) <HTML> (4) <PDF>(9)

Abstract:
In view of problems of deficiencies in real-time display and centralized storage of drilling parameters of full hydraulic directional drilling rig in coal mine tunnel, a drilling parameters monitoring system of directional drilling rig in coal mine tunnel was designed. Distributed design is adopted in the system, and data transmission and communication are realized by CAN bus, while key drilling parameters can be monitored and displayed in real time, such as drilling speed, drilling/drawing pressure, speed, torque, water pump flow and pressure. Data transmission and centralized storage are carried out through explosion-proof computer, which can facilitate analysis and adjustment of drilling parameters. Precise measurement and control of drilling construction can be realized by combining pressure sensor, flow sensor, etc. The field application results show that the system can be used with various types of directional drilling rigs, and can monitor and display various drilling parameters of directional drilling rig in real time and accurately. The desgin of the system has laid a foundation for the follow-up realization of "mechanical-electric-hydraulic" integrated control and fault diagnosis of directional drilling rig in coal mine tunnel.

Design of multi-protocol fusion gateway for underground coal mine

ZHAO Xiaohu, WANG Kuan, SHEN Xueru, TIAN Hao, YOU Peng

2019, 45(1): 6-12. doi: 10.13272/j.issn.1671-251x.2018050100

<Abstract>(37) <HTML> (5) <PDF>(8)

Abstract:
In view of the problems of poor reliability of information transmission and low fusion degree of heterogeneous data for coal mine safety monitoring system, a multi-protocol fusion gateway for underground coal mine was designed. The gateway can be connected to sensors with different protocol types at the same time and transmit multi-source data to remote server in the form of Ethernet protocol data for information fusion. In the gateway, physical layer receives data information of the terminal through different protocols (RS232, RS485, CAN, ZigBee) transmission medium and interface. Protocol layer de-archive different data formats to obtain original data of the end user. System layer completes access of multiple types of devices through task management and communication scheduling. Application layer designs user function and calls the kernel space network layer protocol for data encapsulation to obtain the data in the Ethernet protocol format, the data can be transmitted to the upper node without processing, so as to complete conversion and transmission of multi-type protocol data to the Ethernet protocol data of the gateway. The test results show that the gateway can realize transparent transmission of RS232, RS485, CAN, ZigBee protocol data to Ethernet protocol data, and the transmission delay is concentrated within 15 ms, the packet loss of transmission data is extremely low, so the gateway has a strong communication reliability.

Design of intrinsically safe laser auxiliary light source for low-illumination video acquisitio

LI Wenfeng, CAI Pengbo

2019, 45(1): 13-17. doi: 10.13272/j.issn.1671-251x.2018090058

<Abstract>(70) <HTML> (1) <PDF>(8)

Abstract:
For problems of high power consumption, large volume, close irradiation distance and poor concealment of existing auxiliary light source for low-illumination video acquisition, a design scheme of intrinsically safe laser auxiliary light source for low-illumination video acquisition was proposed. The semiconductor laser diode with 940 nm wavelength of light source is selected, and multi-mode fiber, smoothing glasses and lens are used to realize regular shape and uniform illumination intensity of beam outputted by the semiconductor laser diode. The intrinsically safe driving circuit adopts constant current driving mode with overvoltage, anti-reverse connection and anti-static protection. Working temperature of semiconductor laser diode is reduced through heat dissipation device, so that the laser auxiliary light source can work stably for a long time. The test results show that the laser auxiliary light source with irradiation distance is 20 m, power consumption is less than 3 W and continuous working temperature below 50 ℃.

Research on key technologies of intelligent mining system for thin coal seam

ZHOU Kaiping

2019, 45(1): 18-21. doi: 10.13272/j.issn.1671-251x.2018080051

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Abstract:
Development of intelligent mining technologies for thin seam at home and abroad were introduced. Key technologies principle of intelligent mining system for thin coal seam were focused on including follow-up intelligent technology of hydraulic support on whole working face, intelligent cutting technology of shearer on whole working face, video monitoring technology on working face, electro-hydraulic control technology of hydraulic support, straightness control technology on working face, intelligent remote control technology, intelligent integrated liquid supply control technology and advanced support intelligent control technology. Aiming at problems of thin coal seam mining such as difficulty in mining, low economic benefit and low resource recovery rate, development trend of key technologies of intelligent mining system for thin coal seam was discussed from aspects of three-dimensional intelligent positioning of shearer, intelligent identification of coal-rock interface and intelligent control of hydraulic support.

Multi-level and multi-granularity innovative design knowledge expression method of shearer

LI Xing, DING Hua, YANG Kun

2019, 45(1): 22-27. doi: 10.13272/j.issn.1671-251x.2018050073

<Abstract>(56) <HTML> (3) <PDF>(4)

Abstract:
In view of problems that existing knowledge expression methods are difficult to fully and effectively express innovative design knowledge of shearer, and knowledge expression of existing special knowledge base is not comprehensive enough and its retrieval efficiency is not high, in order to realize reuse of innovative design knowledge and experience of shearer, inspire ability of knowledge analogy transfer by designers, a multi-level and multi-granularity knowledge innovative design expression method of shearer was proposed. Six attributes are extracted including parameter, structure, function, principle, effect and domain. The attributes are described by knowledge with different abstract granularity, each granularity corresponds to abstraction levels of concept layer, semantic relationship layer and instance layer. Knowledge items are generated through feature attribute description, and multi-level and multi-granularity innovative design knowledge base of shearer is constructed. Through ontology reasoning and semantic extension, knowledge of different levels and different granularities is retrieved from local knowledge base and Internet resources, thus realizes multi-level and multi-granularity expression of innovative design knowledge of the shearer. The feasibility of the method was verified by improved structure design of shearer drum.

Feature extraction of vibration signal of roadheader based on singular value decompositio

ZHANG Linfeng, TIAN Muqin, SONG Jiancheng, HE Ying, FENG Junling, YANG Xiang

2019, 45(1): 28-34. doi: 10.13272/j.issn.1671-251x.2018070035

<Abstract>(67) <HTML> (2) <PDF>(8)

Abstract:
In view of difficulty of dynamic load identification of roadheader, feature extraction method of vibration signal of roadheader based on singular value decomposition was proposed. Collected vibration signals is decomposed by wavelet packet, and node coefficients at different frequency bands of each bottom layer are reconstructed to construct the time-frequency matrix. Then singular value decomposition of the matrix is performed, and based on Fisher criterion, class separability criterion based on divergence matrix is used to select singular value which is sensitive to hardness of different cut rock walls, and the value serves as feature quantities of the vibration signal. The criterion value of divergence matrix is used to solve the problem that it is impossible to measure quantitatively sensitivity of singular values to cutting hardness. Analysis results show that for vibration signals of roadheader under three cutting conditions of horizontal cutting, vertical cutting and longitudinal drilling, compared with feature vectors extracted by wavelet packet frequency band energy method, the feature vectors extracted by the singular value decomposition method have better class separability.

Data interpretation method of coal-rock interface detection based on ground penetrating radar

MIAO Shuguang, LIU Xiaowen, LI Huaijiang, WANG Xin

2019, 45(1): 35-39. doi: 10.13272/j.issn.1671-251x.17361

<Abstract>(99) <HTML> (6) <PDF>(7)

Abstract:
For problems that existing coal-rock interface identification methods lacked research on characteristics of coal-rock seam and were unable to interpret data well, a data interpretation method of coal-rock interface detection was proposed combining with coal-rock interface detection model based on ground penetrating radar (GPR). The method uses an improved OTSU to take out threshold segmentation of coal-rock image from GPR under 2D gray histogram, so as to realize coal-rock interface detection. Influence of GPR antenna frequency on detectable coal seam thickness was researched by simulation experiment. The results show that the maximum detectable coal seam thickness in theory would decrease with increase of antenna frequency. Field test was taken out by use of LTD-2100 type GPR with 400 MHz antenna frequency. The test results show that the data interpretation method of coal-rock interface detection based on GPR can improve accuracy of coal-rock interface identification.

Research on filtering of electromagnetic measurement while drilling signal in underground coal mine

KANG Houqing

2019, 45(1): 40-44. doi: 10.13272/j.issn.1671-251x.2018040041

<Abstract>(46) <HTML> (3) <PDF>(6)

Abstract:
In view of problems of slow convergence speed and long computation time existed in electromagnetic wireless measurement while drilling (EM-MWD) signals extracted by adaptive filtering least mean square algorithm and recursive least squares algorithm, a stabilized fast transversal filters for recursive least squares (SFT-RLS) algorithm was proposed, which was used for adaptive filtering unsteady electrical interference and power frequency, as well as double frequency and triple frequency interference, and extracting weak EM-MWD signals in real time. Based on the RLS algorithm, the algorithm uses four parallel filter structures to reduce the operation time, and uses the weighted least squares error for feedback to improve the stability. The simulation results show that the SFT-RLS algorithm can achieve adaptive filtering and adaptive notch of the EM-MWD signals with a sampling rate of 1 kHz, the average running time of each iteration is less than 156.98 μs, so as to realize fast and stable convergence operation and real-time adaptive filtering of EM-MWD signals; the adaptive filtering of the SFT-RLS algorithm can suppress unsteady electrical interference with a signal to interference ratio of -115 dB; the adaptive notch of the SFT-RLS algorithm can filter power frequency and its interference of double frequency and triple frequency in real time, and effectively extract the EM-MWD time position pulse modulation signal with 6.25 Hz, and provide reliable data for correct decoding of EM-MWD signals.

A straightness measurement method of hydraulic support based on inter supports walking robot

BAI Jinming, WANG Ranfeng, FU Xiang

2019, 45(1): 45-51. doi: 10.13272/j.issn.1671-251x.2018060008

<Abstract>(61) <HTML> (5) <PDF>(6)

Abstract:
In view of the problems of low measurement dimension, large error and easy to be affected by dust in current straightness measurement method of hydraulic support, a straightness measurement method of hydraulic support based on inter supports walking robot was proposed. This measurement method is mainly used to chock-shield hydraulic support, sensors are arranged on the inter supports walking robot, which is used for directly measuring multi-dimensional position offset information such as transverse offset, longitudinal offset, transverse bevel angle and longitudinal dip angle of hydraulic support base, then the straightness information of the hydraulic support is indicated by the support position offset. The experimental results show that the deviation error of the two adjacent supports is within 0.2 cm and the angle error of the two adjacent supports is within 10′. When the experimental supports model increased to 100 units, the accumulative error of position offset is expected to 10 cm, angle cumulative error is 8°20′ according to center distance of 1.5 m for conventional hydraulic support on the working face length of 150 m. For length of fully mechanized working face is less than 150 m, the accumulated error is in the acceptable range, can meet measurement demand of hydraulic support straightness. Compared with the traditional one-dimensional measurement information, the method can provide more detailed reference for the control of hydraulic support group through the four-dimensional position offset information.

Research on laser positioning matrix of straightness detection robot for hydraulic support

YANG Xuejun, WANG Ranfeng, WANG Huaifa

2019, 45(1): 52-56. doi: 10.13272/j.issn.1671-251x.2018060035

<Abstract>(62) <HTML> (2) <PDF>(5)

Abstract:
For straightness detection of hydraulic support in unmanned working face of coal mine underground, an attitude and straightness detection model of hydraulic support was proposed. Laser positioning matrix of straightness detection robot for hydraulic support was focused on, and software and hardware design schemes of the laser positioning matrix were expounded. Through analyzing experimental results, following conclusions are gotten:For laser positioning matrix made by photosensitive resistors with a diameter of 12 mm, when light spot diameter is from 9 mm to 30 mm, detection error decreases with the increase of light spot diameter, and the maximum detection error is 7.6 mm. Considering detection precision and effective detection range synthetically, the optimal light spot diameter is selected to be from 12 mm to 18 mm. Factors influencing detection precision of the laser positioning matrix are systematic error and random error mainly. Detection error can decrease by reducing diameter of photosensitive resistor, adding resistor with low resistivity before photosensitive resistor, etc.

Sequences selection research on over-voltage and over-current protection for intrinsic safety power supply

BAO Changjun, LI Jiping, GENG Wenjing, YU Zhixue, CUI Shijie

2019, 45(1): 57-64.. doi: 10.13272/j.issn.1671-251x.2018050095

<Abstract>(32) <HTML> (2) <PDF>(7)

Abstract:
Over-voltage and over-current protection are two forms of over-voltage and over-current protection sequences of intrinsic safety power supply. In order to study the influence of different protection sequence forms on safety performance of intrinsic safety power supply, an equivalent model of spark discharge of intrinsic safety power supply was established, and essential safety performance factors affected the selection of the protection sequences were determined. The protection performance of two protection sequences was compared and studied when happened over-voltage, over-current and over-voltage over-current. The research results show that in the design of intrinsic safety power supplies, the selection of over-voltage and over-current protection sequence is not random and arbitrary, but there are principles to follow: the type of over-voltage protection circuit determines the sequences of over-voltage and over-current protection of intrinsic safety power supplies. In design, the first step is determining the type of over-voltage protection circuit, if the type of over-voltage protection circuit is short circuit type, protection circuit of intrinsic safety power should be designed to protection sequences of over-current-over-voltage, otherwise it should be designed as over-voltage and over-current protection sequence, the protection circuit of the over-voltage and over-current protection sequence has a shorter turn-off time, the protection effect is better and the safety performance of the intrinsic safety power supply is higher.

An accurate estimation method for state of charge of mine-used energy storage battery

ZHANG Jianwen, QI Minghui, WANG Zheng, YAN Jiaming

2019, 45(1): 65-69. doi: 10.13272/j.issn.1671-251x.2018060036

<Abstract>(82) <HTML> (5) <PDF>(5)

Abstract:
For the problem that accumulative error was easy to occur in estimation for state of charge (SOC) of mine-used energy storage battery based on ampere-hour integration method, an accurate estimation method for SOC of mine-used energy storage battery based on improved ampere-hour integration method was put forward. In the method, temperature correction coefficient, aging degree correction coefficient and charging-discharging ratio correction coefficient are introduced to correct battery capacity, so as to realize accurate estimation of battery SOC. Battery terminal voltage is used to replace open circuit voltage when battery SOC is from 0 to 15% or from 90% to 100%, then the estimation results obtained by the improved ampere-hour integration method are corrected real-timely. The experimental results show that the method can improve estimation precision of SOC of mine-used energy storage battery, and the estimation error is within ±3%.

State of charge prediction for mine-used power battery

TAN Faming, WANG Qi

2019, 45(1): 70-75. doi: 10.13272/j.issn.1671-251x.2018060051

<Abstract>(83) <HTML> (3) <PDF>(4)

Abstract:
It was difficult to optimize parameters of regularization and kernel function when least squares support vector machine(LSSVM) was used to predict state of charge(SOC) of mine-used power battery, and grey wolf optimization(GWO) algorithm was prone to early maturity, poor stability and local optimization when solving constraint optimization problem alone. In view of above problems, on the basis of differential evolution GWO(DE-GWO) algorithm, non-linear convergence factor in the form of exponential function is used to improve the DE-GWO algorithm. The non-linear convergence factor has low attenuation rate in the early stage of iterative process and the global optimal solution can better be found, while it has high attenuation rate at the end of iterative process and the local optimal solution can be found more accurately, which effectively balances global search ability and local search ability. The experimental results show that the maximum absolute error and the maximum relative error of SOC prediction model for mine-used power battery are 3.7% and 5.3% respectively after LSSVM parameters are optimized by the improved DE-GWO algorithm.

Partial discharge pattern recognition method for mine-used dry-type transformer

TANG Jianwei, SU Hong, YAN Jiaming, ZHANG Jianwen, WANG Jinchuan, WANG Enjun

2019, 45(1): 76-80. doi: 10.13272/j.issn.1671-251x.2018090081

<Abstract>(57) <HTML> (4) <PDF>(5)

Abstract:
In order to improve recognition accuracy of partial discharge pattern of mine-used dry-type transformer, a partial discharge pattern recognition method for mine-used dry-type transformer was proposed. Firstly, orthogonal matching pursuit algorithm is used to denoise original partial discharge signal, which can retain useful information of the original partial discharge signal to the greatest extent. Then, autoregressive coefficient features of the partial discharge signal after denoising are extracted by autoregressive model. Finally, the autoregressive coefficient features are input into random forest integrated classifier to recognize partial discharge pattern. The experimental result shows that average recognition accuracy of the method is 98%.

Research on impedance matching method for magnetic resonant coupling wireless power transmission system

YUAN Shiqiang, CUI Yulong, WANG Jingqin, FAN Haoliang, FAN Yachao

2019, 45(1): 81-86. doi: 10.13272/j.issn.1671-251x.2018090005

<Abstract>(37) <HTML> (3) <PDF>(9)

Abstract:
In view of the problem that the input impedance does not match the RF internal resistance and the output power decreases due to the change of transmission distance or load in magnetic resonant coupling wireless power transmission system, an impedance matching method based on Smith chart theory was proposed taking L-type matching network as an example. Based on equivalent circuit theory and Smith chart theory, a parameter expression of matching inductance and matching capacitance is derived. In the case of impedance mismatch, the matching network parameters can be controlled by adjusting normalized resistance variables, so as to realize the impedance matching of the system. The simulation and experimental results show that the network structure of the matching method is simple and the complex computation process is avoided. Under the same conditions, the output power of the system after matching is significantly improved compared with that before matching, and the frequency splitting of the system can be effectively suppressed.

Optimal configuration of coal mine microgrid capacity for power generation with coalbed methane

CAO Na, GUO Peixuan, YU Qun, GUO Baode

2019, 45(1): 87-94. doi: 10.13272/j.issn.1671-251x.2018070025

<Abstract>(66) <HTML> (2) <PDF>(6)

Abstract:
In order to improve efficiency and energy utilization rate of coal mine microgrid system, optimal configuration model of coal mine microgrid capacity for power generation with coalbed methane was established taking comprehensive net benefit of coal mine as objective function, and taking cost, generated income and various constraints of coal mine microgrid into consideration. According to power generation of wind turbine generator and photovoltaic battery and load data of the whole year, particle swarm optimization algorithm is used to solve the capacity optimization configuration model, and installation capacity of distributed power and energy storage equipment are obtained. The optimal configuration scheme is obtained through example simulation, and cost and benefit analysis show that the power exchange process between microgrid and large grid generates generate revenue. At the same time, the effects of different operating indicators such as renewable energy ratio and spontaneous use rate on the configuration results were analyzed, and the research results can provide reference for equipment capacity planning of coal mine microgrid.

Fault diagnosis method for mine hoist spindle system based on ontology

ZHAO Xurong, LI Juanli, WANG Xuewen

2019, 45(1): 95-99. doi: 10.13272/j.issn.1671-251x.2018080054

<Abstract>(36) <HTML> (3) <PDF>(5)

Abstract:
In view of problems of low efficiency, poor accuracy and difficulty in reusing and sharing diagnostic knowledge of traditional fault diagnosis methods of mine hoist, a fault diagnosis method for mine hoist spindle system based on ontology was proposed. In view of diversification of fault causes of mine hoist spindle system, a three-dimensional coordinate method is proposed to summarize various fault phenomena and their causes, and the problems such as incomplete fault summary and unreasonable reason analysis are solved; fault diagnosis ontology library is established through Protégé4.3, and fault phenomenon, fault causes and their corresponding logical relationship are stored in ontology library as knowledge, which solves problems of knowledge sharing and reuse of fault diagnosis, and improves efficiency of fault diagnosis; SQL Server 2008 database is used to access monitoring data of the spindle system, and Java persistence layer application program interface JPA and Java application program interface Jena are used to establish mapping between ontology library and database, so as to realize dynamic data exchange of database and ontology library; finally the monitoring data is analyzed through ontology library to determine fault causes and locate fault sources, and then fault diagnosis is realized. The example analysis results show that the fault diagnosis method for mine hoist spindle system based on ontology improves efficiency and accuracy of fault diagnosis, and has high reliability.

Mine-used pick wear measurement system based on shape from focus

LI Ning, DING Hua, WANG Yiliang

2019, 45(1): 100-103. doi: 10.13272/j.issn.1671-251x.2018060054

<Abstract>(37) <HTML> (3) <PDF>(4)

Abstract:
For problems of complicated process, low accuracy and high cost in existing pick wear measurement methods, a mine-used pick wear measurement system based on shape from focus was designed. The collected sequence images of cone on top of pick are processed through shape from focus technology, so as to obtain 3D shape recovery diagram of cone on top of pick. On this basis, depth information of surface of cone on top of pick is gotten, thus volume of cone on top of pick is calculated, and wear volume of pick is obtained by use of difference method. The test result shows that measurement accuracy of the system is 97.68%.

Research on on-board charging system of mine-used electric locomotive

YANG Jinxin, ZHU Longji

2019, 45(1): 104-108. doi: 10.13272/j.issn.1671-251x.2018060011

<Abstract>(45) <HTML> (10) <PDF>(5)

Abstract:
In view of problems of low power quality, low cruising power, short service life of battery, separation between battery charging device and locomotive driving system existed in current charging system of mine-used electric locomotive with lead-acid battery, a new integrated on-board charging system was designed. The system is composed of the front-stage PWM rectifier circuit and the back-stage Buck circuit in series. When charging, the motor windings are reconstructed into the boost inductance of the PWM rectifier circuit to form an integrated on-board charging and discharging circuit. The supercapacitor is used to replace the battery as the energy storage element, which can realize quick on-board charging and discharging function. The simulation results show the system has shorter charging time and higher efficiency, and can realize functions such as power factor correction, ripple suppression, efficient and rapid charging and discharging compared with the traditional charging system.

2019 Vol. 45, No. 1

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