Multicomponent gas detection in goaf can be used to determine the oxidation and spontaneous combustion status of residual coal in goaf,and to determine the development trend of spontaneous combustion of residual coal in goaf.Tunable diode laser absorption spectroscopy(TDLAS)gas detection technology is becoming increasingly widely used due to its narrow spectral lines,which can effectively avoid cross interference.The study adopts a structure that multiple lasers share an absorption pool to construct a laser multicomponent gas detection device,which greatly reduces the overall cost of the detection device,improves integration,and reduces the size of the detection device.Through the research of multi component gas TDLAS detection technology,the structure and hardware circuit of the detection device were designed.The developed multi component gas detection device was used to test the detection range,detection error and response time of six indicator gases including CH4、O2、CO2、CO、C2H4 and C2H2.The testing verified that the multi component gas detection device can accurately detect each indicator gas,and the detection range,detection error and response time meet the standard requirements.
Aiming at the problem that the engineering parameters related to drilling tools in the borehole cannot be directly obtained in various kinds of borehole construction in the coal mine at present, the engineering parameters while drilling measurement system suitable for underground working conditions of the coal mine is developed, and the system includes four parts: hardware, sensor components, electronic devices and supporting software. It can measure engineering parameters near the bottom of the hole such as drilling pressure, torque, inner and outer annular pressure, rotational speed, vibration and temperature, and measure drilling trajectory parameters such as azimuth, inclination angle, and tool facing angle. This paper fully introduces the working principle, components and main functions of the engineering parameters measurement while drilling system and carries out the ground pilot test. The test shows that the developed engineering parameter MWD system has continuous and stable working conditions, the engineering parameter measurement is accurate, and the data change trend is in accordance with the actual working condition, which can effectively guide the drilling construction. The deviation of the measured borehole trajectory parameters in the same borehole section is smaller than that of the conventional cable MWD system, which fully meets the requirements of directional drilling construction.
To improve the speed of fault diagnosis of the handling car transmission system, it is necessary to design and analyze the fault diagnosis method of the hydraulic support handling car transmission system for coal mines. Firstly, the coupling demodulation abnormal signal is obtained, and the initial fault identification is realized by using the improvement instruction. Based on this, the fault diagnosis method for the transmission system of the hydraulic support truck(FFT) high-frequency fault diagnosis model is designed, and the fault diagnosis is finally realized through database regulation. The test results show that the diagnostic response time of the designed method is only 1.05s, indicating that the designed method is faster in diagnosis during practical application and can quickly assist in the repair of the transmission system of the hydraulic bracket handling car for coal mines, which has practical application value.
In order to solve the problem that it is difficult to extract the fault features of rolling bearings under strong noise,a new feature enhancement method-fractional-order frequency weighted energy operator(FFWEO)was proposed.Firstly,Fourier transform was used to transform the signal from time domain to frequency domain,and obtained the amplitude function and phase function.Secondly,set the variation range and step size of differential order,perform fractional differential processing on the amplitude function of the signal in the frequency domain according to the time domain differential property of Fourier transform,combined the amplitude function with the phase function,and then used the inverse Fourier transform to obtain the modified signal.Finally,Hilbert transform was applied to differential signals of different orders to obtain envelope signals.The envelope kurtosis index was used to select the best differential order,and the envelope spectrum was obtained from differential signals in order to determine the bearing fault mode.The experimental results show that the method can effectively extract the fault features of rolling bearings under the strong noise background.
This paper studies the control strategy of mine electric vehicle driving system, the simulation model of the vehicle driving system cooling circuit is established based on the heat transfer relationship between the motor and the electronic control components. According to the bench test results, the simulation model is matched to verify the authenticity and accuracy of the simulation platform. In addition, this paper designs a model predictive controller for the vehicle driving system, which selects the coolant temperature as the thermal management target, and the coolant flow and heat dissipation air volume as the controlled pairs. The performance of temperature control efficiency and energy consumption are compared under the model predictive control (MPC), PID and switching strategies. The analysis results show that the thermal management method based on model predictive control can cool the electronic control system more efficiently and consume less system energy.
In view of the problems existing in the current electronic mine pressure monitoring equipment, such as distorted interference data, many transmission cables, short power supply distance and so on, the optical fiber mine pressure monitoring equipment has the problems of small capacity, high cost, monitoring blind areas and so on. Through the research of key technologies such as distributed grating array stress sensing technology, distributed grating array sensing multiplexing and network technology, distributed grating array sensing demodulation technology, combined with the mine pressure theory, optical fiber communication technology and computer technology, the project develops the grating array stress sensing device and grating array sensing demodulation substation suitable for the requirements of coal and rock stress measurement. Combined with the monitoring and early warning platform software, a real-time, remote and online distributed grating array stress monitoring system is formed.
介绍了 ZWY90/132-G型煤矿井下移动式瓦斯抽放泵站的构成以及智能监测、调控功能,并据此设计了现场设备层、现场控制层和过程监控层3层监控架构体系.提出了监控设备选型原则,开展了低功耗、自诊断、数字传输的监控设备选型.设计并实现了具有数据存储和查询功能、实时曲线和历史曲线显示功能、操作权限管理功能、故障报警和查询功能的监控中心站软件.最后,通过性能试验验证了各项试验项目均满足相关标准及技术要求,基本实现了 ZWY90/132-G型煤矿井下移动式瓦斯抽放泵站的智能化,为最终实现无人化创造了条件.
针对煤矿井下人工巡检存在的问题,设计了一套矿用轨道式巡检机器人系统.阐述了巡检机器人系统的总体结构,论述了各组成部分的设计思路和实现方法,介绍了系统所具备的主要功能.实验表明,该巡检机器人系统能取代人工巡检,可完成对煤矿井下设备、设施的自主巡检.
针对目前多数定向钻机泥浆泵使用定量马达驱动而无法调节泥浆泵排量的情况,设计了一种用于调节泥浆泵输入转速的四挡手动变速箱.该变速箱输入端通过联轴器与电机相联、输出端通过联轴器与泥浆泵输入轴联接,当需要调节泥浆泵流量时,通过手动调节变速箱挡位可实现泥浆泵流量定量调节.该变速箱采用两级传动减速,第1级传动为公共级,第2级则通过不同齿轮对的相互啮合,实现4个不同挡位变速.整个变速箱结构紧凑、操作简单可靠.
为研究涡轮与导轮叶片数匹配对涡轮发电机性能的影响规律,建立多种涡轮与导轮叶片数配合的涡轮发电机模型,基于CFD仿真技术对涡轮发电机模型进行三维非定常数值模拟,研究结果可为煤矿井下钻孔内涡轮发电机优化设计提供一定参考.
针对精确人员定位识别卡在煤矿井下使用过程中暴露出来的各种结构缺陷及问题,总结了几种常见问题,逐一分析失效原因并进行优化设计.应用SolidWorks Simulation软件对结构进行强度校核,并改进了结构的缺陷部分.采用双色注塑工艺和人机交互性升级了识别卡按键结构.通过调整按键表面深度及增大按键与电路板之间的间隙,解决了按键被误按的问题等.采用该方法设计的识别卡结构解决了使用过程中出现的各种问题,在煤矿井下得到了良好的应用,保证了煤矿的正常生产,保障了煤矿工人的生命安全.
自主研制了由智能掺混装置及高温烟气型溴化锂制冷脱水装置构成的低浓度瓦斯发电气体预处理系统,针对气体预处理系统开展了相关性能试验.试验结果表明:智能掺混装置在7 000 m3/h设计流量下运行阻力不大于100 Pa,掺混均匀度大于95％,掺混后瓦斯浓度变化速率小于2％/min,避免了瓦斯浓度变化速率过大引起的发电机组停机;高温烟气型溴化锂制冷脱水装置实现瓦斯气体降温20℃,脱出水量129 kg/h,极大降低了因水分进入发电机组引起的发电机组故障率;低浓度瓦斯发电气体预处理系统总耗电量约16.7(kW·h)/h,运行成本低.
基于煤矿用巡检机器人的作业环境和防爆要求,分析了各充电方式的优缺点,提出了一种基于能量变换的充电方法.巡检机器人与充电站之间通过机械联接传递能量,规避了电气直连充电的失爆风险,降低了充电对接的设计要求,为机器人在煤矿井下安全充电提供了新思路.试验表明该充电方法技术可行,可满足巡检机器人在煤矿井下的快速充电需求.
Post-processing is an important technology in transferring information between CAM software and CNC system. At present, the traditional five-axis machine tool cannot satisfy the requirements of high precision and efficiency in the manufacture of complex parts due to its single function. The auxiliary rotary spindle, auxiliary linear axis, and power tool rest are added on the basis of the traditional five-axis machine tool to solve the technical bottleneck problem. Thus, the machine tool with the compound function of turning and milling is established. The control of the motion chain and the numerical control system of the turn-milling compound machine tool is more complex than that of the traditional five-axis machine tool, and the development of the post-processing is also more difficult. This study investigates the development of post-processing of a nine-axis five-linkage turn-milling compound machine tool (PUMASMX2600ST). First, the kinematic chain and coordinate system of the turning and milling function are established, respectively, according to the function division of the machine tool, and the inverse kinematic model is solved by the kinematic coordinate transformation. Second, a special post-processing software with turning and milling functions is developed using Visual Basic language. Finally, a type of blade root milling tool is used as the specimen for simulation and actual cutting verification. Experiments show that the special processor is correct and reasonable, and it can satisfy the requirements of the machine tool.
为提高王坡煤矿掘进巷道抽放管路安装机械化程度,解决抽放管路安装作业用工数多、劳动强度高、效率低的难题,以王坡煤矿掘进巷道地质条件为背景,根据抽放管路安装作业特点,创新研制了一种矿用气动管路辅助安装车,并分析了其主要功能与主要技术参数.通过现场应用,有效提高了人员作业期间的安全保障,实现了减人提效的目标.
通过分析煤矿井下圆柱导向结构频繁出现导向柱耐磨性差、铜套磨损严重等故障的原因,结合有限元分析结果,采取高强度不锈钢管代替传统碳钢导向柱,采用多道密封组合防尘与导向的结构.煤矿井下试验表明,采用该润滑充分的圆柱导向结构的耐磨性、强度、精度均能满足使用要求,且大幅度延长了该结构的使用寿命,降低了维修成本.
针对露天煤矿凿岩钻机参数单机显示单一、不具备远程监控实时查看功能导致施工孔位品质低的问题,设计开发了一种钻机远程监控系统.该系统采用露天采区和露天办公区分段布局、网络关联.露天采区以PLC控制为主,负责钻机信息采集和发送;露天办公区以UI设计为主,负责钻机信息接收和显示.通信采用矿区4G内网,并结合串口服务器、CPE等设备实现数据传输.通过在矿区实际应用,该系统具备远程同步、多参数监控功能,可以实现管理、设计、施工等相关人员在线同步沟通,提高成孔效率和质量.
根据煤矿巷道的实际环境条件以及快速掘进工艺的需求,设计了锚运一体机控制系统.该系统基于CAN总线通信,并具备RS485、以太网等多种接口.通过控制器和遥控系统、机身外围传感器系统,实现锚运一体机的控制和保护功能.锚杆钻机具有一键升降智能控制方式,整机具有激光测距自动跟随功能.通过锚杆机与运输机的分工配合,在掘进的同时可以进行锚杆支护,缩短了整个掘进工艺完成的时间,提高了煤矿掘进效率,降低了工人的劳动强度,符合煤矿生产过程中对安全高效生产的要求.
针对煤矿大倾角巷道,设计了一种大倾角掘进机的装载机构,对装载机构的装载能力进行了计算,并设计了一种镰刀形大直径收集星轮,可有效提高大倾角掘进机的收集能力.分析了星轮损坏形式,对星轮轮齿进行了耐磨设计,提高了星轮的耐磨性和使用寿命,为大倾角掘进机装载机构的设计提供了依据.
针对当前确定挡矸支架强度和结构参数基本依靠经验的问题,提出了考虑顶板断裂位置的沿空留巷挡矸支架强度计算公式,构建了结构设计系统.在确定断裂线位置基础上,通过改进的分离岩块法计算挡矸支架延米承担的载荷,结合挡矸支架的长度,确定支架阻力,并以何家塔煤矿挡矸支架进行验证.提出挡矸支架具备三大功能,即支的住、挡的严、拉的动,构建三大系统,即支护系统、挡矸系统、拉移系统,阐述每个系统内涵,为挡矸支架的选型提供思路.
