Aircraft Observation and Simulation of the Supercooled Liquid Water Layer in a Warm Conveyor Belt over North China

This paper studied a snow event over North China on 21 February 2017,using aircraft in-situ data,a Lagrangian analysis tool,and WRF simulations with different microphysical schemes to investigate the supercooled layer of warm conveyor belts(WCBs).Based on the aircraft data,we found a fine vertical structure within clouds in the WCB and highlighted a 1-2 km thin supercooled liquid water layer with a maximum Liquid Water Content(LWC) exceeding0.5 g kg^(-1) during the vertical aircraft observation.Although the main features of thermodynamic profiles were essentially captured by both modeling schemes,the microphysical quantities exhibited large diversity with different microphysics schemes.The conventional Morrison two-moment scheme showed remarkable agreement with in-situ observations,both in terms of the thermodynamic structure and the supercooled liquid water layer.However,the microphysical structure of the WCB clouds,in terms of LWC and IWC,was not apparent in HUJI fast bin scheme.To reduce such uncertainty,future work may focus on improving the representation of microphysics in bin schemes with in-situ data and using similar assumptions for all schemes to isolate the impact of physics.

Development of belt conveyor driving system

A short review for the existing various driving methods for belt conveyor was given, which include the analysis and comparison about the advantages, disadvantages and suitable application range of these methods. Based on this the vari-able-frequency-control(VFC) method for belt conveyor drive was fully discussed with focus on its application in medium-high voltage range. The principle of Neutral Point Clamped (NPC) Three-Level Inverter using high-voltage IGBTs together with the control strategy of rotor field-oriented vector control for induction motor drive were illustrated.

Feeding Control System of Conveyor-belt Based on Image Processing

Based on the real time measurement of the width of coal flow, the method for measuring the width and the relative position of coal flow on a conveyor-belt by image processing was presented. A feeding control system of conveyor-belt was proposed using a fuzzy controller. This control system consists of CCD camera, universal image sampling system, control network and executor. The result shows that the algorithm used in the image processing is simple and efficient, and the measuring error of width is less than 4%.

Structural Optimization of Metal and Polymer Ore Conveyor Belt Rollers

Ore conveyor belt rollers operate in harsh environments,making them prone to premature failure.Their service lives are highly dependent on the stress field and bearing misalignment angle,for which limit values are defined in a standard.In this work,an optimization methodology using metamodels based on radial basis functions is implemented to reduce themass of twomodels of rollers.From a structural point of view,one of the rollers ismade completely of metal,while the other also has some components made of polymeric material.The objective of this study is to develop and apply a parametric structural optimization methodology to minimize the mass of the two models of rollers.To represent the mechanical behavior of the rollers,simulations were performed using the finite element method.During the numerical optimization process,the variable parameters were the dimensions of the shaft and external tube.The geometric configuration that corresponded at the same time to the lowest mass and acceptable ranges for the stress and bearingmisalignment angle was determined.With the proposed methodology,a 32.3% reduction in mass was obtained for a metal roller design and an 18.9% reduction for a polymer roller.In both cases,the constraints were not violated.For the all-metal roller,the safety factors for the maximum stress and bearingmisalignment angle were 1.44 and 1.75,respectively,while for the polymer roller the corresponding figures were 1.50 and 2.23.This work describes a low-computational-cost optimization methodology for roller designs that have been little studied in the literature.Furthermore,the methodology could be adapted for use with other types of rollers and rollers made of different materials.

Conveyor-Belt Detection of Conditional Deep Convolutional Generative Adversarial Network

In underground mining,the belt is a critical component,as its state directly affects the safe and stable operation of the conveyor.Most of the existing non-contact detection methods based on machine vision can only detect a single type of damage and they require pre-processing operations.This tends to cause a large amount of calculation and low detection precision.To solve these problems,in the work described in this paper a belt tear detection method based on a multi-class conditional deep convolutional generative adversarial network(CDCGAN)was designed.In the traditional DCGAN,the image generated by the generator has a certain degree of randomness.Here,a small number of labeled belt images are taken as conditions and added them to the generator and discriminator,so the generator can generate images with the characteristics of belt damage under the aforementioned conditions.Moreover,because the discriminator cannot identify multiple types of damage,the multi-class softmax function is used as the output function of the discriminator to output a vector of class probabilities,and it can accurately classify cracks,scratches,and tears.To avoid the features learned incompletely,skiplayer connection is adopted in the generator and discriminator.This not only can minimize the loss of features,but also improves the convergence speed.Compared with other algorithms,experimental results show that the loss value of the generator and discriminator is the least.Moreover,its convergence speed is faster,and the mean average precision of the proposed algorithm is up to 96.2%,which is at least 6%higher than that of other algorithms.

Design and Application of Leather Replacement Tool for Belt Conveyor Seal

In order to solve the problem which may be generated in the case of manual replacement of the belt conveyor sealing leather, such as the operation space is small, the work efficiency is low and the finger is easy to be scratched, Using the principle of simulated bionics, through theoretical analysis and experimental verification,a tool was designed to replace the belt conveyor sealing leather. The tool includes a limit device, feeding device,U-shaped handle three parts, suitable for the replacement of various types and sizes of belt conveyor sealing leather. Use this tool to replace the belt conveyor sealing leather, the results show that： 1） The effect of replace belt conveyor sealing leather is good, belt conveyor sealing leather flat and solid. 2） The replacement proces saveraged 1. 77 min, shorter than the original method of more than 8 min. 3） Direct contact of the fingers and the metal baffle edge was avoided, so as to reduce the chances of a finger injury.

带式输送机水平转弯段的自动纠偏系统设计

长距离带式输送机在自然转弯过程中容易出现输送带跑偏等问题,主要纠偏方法是对转弯段托辊架的角度进行调整,但目前调整多为人工调整。文中通过设计一种可调整托辊架槽角和抬高角的自动纠偏系统,对机械结构设计、控制系统设计和传感器选型进行研究。机械结构设计方面进行了托辊架支撑体、推进装置与起升装置的结构设计和计算,控制系统设计方面进行了控制流程设计、驱动设计和传感器的设计与选型,最后进行了关键零部件的有限元分析和强度校核,分析了关键零部件在不同抬高角和不同槽角下的等效应力变化情况,为转弯段纠偏装置的设计提供了理论参考。

煤矿用带式输送机电气控制系统设计优化

针对传统的煤矿用带式输送机电气控制系统已经无法满足现在煤矿生产的需求的问题,通过对电气控制系统现状的分析,提出了带式输送机的电气控制系统升级优化方案,从软件、硬件、性能、节能方面对其进行设计改进,全面提高其运行效率、可靠性、节能性和安全性。

基于大数据技术的皮带预警系统设计

皮带运输机作为矿山重要的运输设备,其性能直接影响生产效率和运行成本。针对现场巡查才能发现皮带运输机异常的问题,本文运用大数据技术对皮带电流进行归纳和分析,设计开发了一套智能化的皮带预警系统,能够及时、准确、有效地发出警报,实现了对皮带异常状态的提前预警。结果显示,预警系统投入使用后,故障平均诊断时间由60 min缩短为5min,减少了系统停机的次数,提高了选矿厂的生产效率。

遂昌金矿高浓度似膏体充填系统升级改造

为解决遂昌金矿现有充填系统存在的尾砂斗仓易堵塞、大倾角带式输送机无法变频调节供料量、卧式双轴搅拌机转速过低、充填料浆工作流速过小、充填系统无自动控制系统等问题,进行了高浓度似膏体充填系统升级改造。结果表明:通过尾砂斗仓改造,使用变频板带式给料机、高转速搅拌桶、小管径充填管道,进行自动化控制系统升级,可显著提高充填质量和效果;充填系统改造总投资约90万元,综合充填成本约为40.0元/t。

基于太赫兹成像的输送带撕裂检测与分类识别研究

针对现有输送带撕裂检测方法存在灵敏度和安全性能低,且无法消除复杂工作环境带来的影响等问题,提出了一种基于太赫兹成像技术的输送带撕裂检测方法。设计并搭建了连续波太赫兹反射式成像系统,采集输送带撕裂的太赫兹图像;对原始图像进行滤波等处理获得低噪声太赫兹图像;最后搭建了基于机器学习太赫兹图像自动分类识别系统,该系统通过提取太赫兹图像的灰度直方图统计特征和几何特征,构建太赫兹图像特征库,并利用特征选择去除特征冗余,最终结合分类器实现对输送带撕裂种类的自动分类与识别。结果表明:通过太赫兹反射式成像系统对输送带进行成像实验,验证了太赫兹波成像技术检测输送带撕裂的可行性;太赫兹图像自动分类识别系统实现了对输送带3种撕裂种类的自动分类与识别,在组合特征下,使用支持向量机(Support Vector Machine,SVM)的分类准确率可达91.6%。

复杂工况下带式输送机驱动系统改造设计及应用

主斜井带式输送机经过长时间的运行,面临着变频器、控制设备老化及关键元器件备件采购困难,为了保证主斜井带式输送机的可靠运行,对某煤矿主斜井运输机陈旧的变频器和控制设备进行更换,同时对变频器和控制设备进行冗余设计。首先对原控制系统程序进行更新,实现新增变频器系统与原有变频器系统之间灵活自主切换;其次,设计新增变频器与原有变频器既可以互为备用,也可以交叉控制,实现对胶带机驱动的多样选择;然后优化主斜井带式输送机在轻载及重载工况下软起动/软停车动态过程,实现各驱动之间的平稳启动和功率平衡,抑制胶带输送机动态张力波对胶带和机械设备造成的冲击,避免撒料与叠带,延长输送机使用寿命。最后,MNS主从控制柜与变频器、主站控制柜间通讯采用专用的DP通讯线缆,设计变频器MNS主从控制柜与主站控制柜按冗余通讯进行配置,保证通信的可靠性。现场运行表明,提出的改造方案大幅提高了驱动系统和控制系统的可靠性,有效保证主斜井带式输送机的安全运行,具有推广价值。

煤矿井下原煤长距离运输带式输送机巡检系统研究

为实现带式输送机高效巡检,针对带式输送机铺设距离长、工作环境恶劣以及空间狭小等问题,构建一种带式输送机巡检系统代替人工巡检。巡检系统关键子系统包括有轨道系统轨道支撑系统、机器人本体以及无线通信系统等,采用高强度铝合金作为运行轨道并固定到巷道顶部;机器人本体布置有各类检测传感器、无线通信以及视频采集、温度采集装置等,实现运行沿线环境参数、带式输送机运行状态等采集;在巷道内间隔150m布置一个无线基站,通过无线基站实时接收机器人本体检测数据并传输至上位机,实现检测数据分析,以便实时掌握带式输送机运行情况。现场应用后,该巡检系统运行平稳,可代替人工巡检,应用效果较为显著。

基于自适应滤波器的皮带机动态称重信号处理方法

针对目前皮带机动态称重系统的称重信号存在噪声或干扰的问题,提出了一种改进自适应噪声消除(IANC)的称重信号处理方法。建立了皮带机动态称重系统动态响应过程的数学模型。设计了结合卡尔曼和最小均方的算法(KF-LMS),提升了ANC噪声消除的性能。实验阶段,通过模拟和搭建实验平台对所提方法进行测试。结果表明,与LMS,NLMS,SLMS等算法相比,所提的KF-LMS算法在皮带机动态称重信号处理中具有良好性能,具备较高的可靠性和称重精度。实验结果验证了所提方法的有效性和实用性,该模型具有广阔的应用前景。

矿用带式输送机控制系统设计优化

以某煤矿矿用带式输送机控制系统为研究对象,介绍了一种矿用带式输送机控制系统设计优化方案。该方案在原控制系统基础上,增加了现场监控元件和PID控制器。通过利用现场监控元件采集到的数据进行分析,自动判断带式输送机的运行状态,生成并发送相应的控制指令,以此调节带式输送机的运行状态,提升其运行效果。该优化方案为煤矿生产工作的开展打下了良好基础,并确认其具有一定的应用价值。

煤矿带式输送机监控系统的应用分析

煤矿带式输送机对于井下煤炭运输起着十分重要的作用。然而,在运行过程中,由于一些不可控的因素,带式输送机会发生各种故障。为了保证带式输送机的安全运行,需要建立带式输送机监控系统。介绍了煤矿带式输送机监控系统的功能,重点分析了带式输送机智能监控系统的建设和应用,主要包括智能煤流调速系统和智能异物识别系统,可以为煤矿带式输送机的安全高效运行提供一定的参考。

煤矿主运带式输送机自动控制系统开发与实践研究

为进一步探究煤矿主运带式输送机的自动控制方法,结合实际情况,基于可编程控制器等硬件设备,并整合协同控制、模糊控制等技术方法,构建面向煤矿主运带式输送机的自动控制系统,并将其投入实际应用。实际测试结果显示,该系统能够在保障输送机运输效率不变的前提下,有效降低电能消耗,具有一定的现实意义。

基于GPRS的带式输送机无线监测系统设计研究

文章以GPRS技术为基础,设计了一款具有远程监测功能的带式输送机无线监测系统,首先介绍了系统软件设计框架,分析了传感器节点、路由节点、网关节点、数据中心四个软件程序设计方法。然后从传感器节点、路由节点与网关节点几方面介绍了硬件总体设计方案,并对传感器节点监测电路、无线射频模块接口电路、存储模块电路等几个关键模块电路设计展开了分析,经验证所设计的无线监测系统可以满足带式输送机的故障监测需求。

煤矿带式输送机智能控制及监控系统设计研究

为进一步提升煤矿带式输送机的运行质量,基于智能控制理念,对煤矿带式输送机智能控制及监控系统整体架构进行设计,而后对该系统中的PLC、智能控制、通信功能等设计工作要点进行详细探讨,以完成系统设计。对系统进行测试,结果显示,该系统各项功能均可正常进行,表明设计的系统在实际工作中具有一定的应用价值。

基于物联网技术的智能散状物料带式输送系统的远程监控与管理研究

研究了基于物联网技术的智能散状物料带式输送系统的远程监控与管理,旨在实现对带式输送系统的远程监控和智能化管理,以提高效率和可靠性。为实现此目的,首先分析了物联网技术及其在带式输送系统中的潜在应用;其次设计了带式输送系统的物联网技术框架,进一步构建了远程监控与管理系统。研究结果显示,物联网技术在实现智能散状物料输送系统中具有高度的可行性和效率。最后讨论了实现过程中的关键技术和创新点,为该领域的进一步研究提供了有价值的参考。