ZT型系列矿用火箭弹的研制及应用

文中介绍了ＺＴ系列矿用火箭弹的分类、结构和６中架设方法，该类火箭弹用于矿山爆破能保证溜井堵塞处理人员的安全。     

ZT14型矿用火箭弹处理尖山铁矿溜井堵塞

本文介绍了ＺＴ１４型２号矿用火箭弹处理尖山铁矿１号溜井堵塞的全过程，这项技术，对类似矿山有参考价值。     

我国矿用火箭弹发展应用述评

文中详细介绍了目前国内常用的四种矿用火箭弹以及处理溜井堵塞的工艺流程。采用矿用箭弹处理溜井堵塞尚未与我国矿山全面推广使用。其主要原因是这种矿用箭弹的结构在可靠性、安全性以及使用等方面还存在的一此问题，作者对此提出了几点建议。     

溜井堵塞爆破

本文就矿山生产中,溜井堵塞时,由于处理方法不当,将造成人身、设备事故。应用“中条矿用火箭弹”处理,确保了人员、设备安全和处理效果。     

矿用火箭弹引爆装置的研制

本文介绍矿用火箭弹的一种安全可靠的撞击引爆装置和导爆管定时引爆系统。     

高深溜井井筒堵塞的爆破处理实践

溜井是采用平硐-溜井方式开拓矿山的运输咽喉,溜井正常与否对矿山生产影响极大。本文通过黑沟铁矿高深溜井井筒堵塞处理实例,对其堵塞爆破处理方法及经验做了系统分析。重点介绍的爆破冲击波破拱疏通高深溜井井筒高位堵塞的爆破方法,富有新意,可供国内外同类型矿山参考借鉴。     

高深溜井井筒堵塞的爆破处理实践

溜井是采用平硐-溜井方式开拓矿山的运输咽喉,溜井正常与否对矿山生产影响极大。本文通过黑沟铁矿高深溜井井筒堵塞处理实例,对其堵塞爆破处理方法及经验做了系统分析。重点介绍的爆破冲击波破拱疏通高深溜井井筒高位堵塞的爆破方法,富有新意,可供国内外同类型矿山参考借鉴。     

基于地磁测量的火箭弹滚转角解算误差补偿方法研究

为实现火箭弹弹道修正,需实时解算弹体的滚转角。根据地磁场基本特性,采用两轴磁传感器测量地磁场分量,并同时测量弹道倾角以解算弹体姿态角。提出一种火箭弹弹体滚转角解算的误差补偿方法,进行某型火箭弹打靶试验,利用该方法对火箭弹飞行试验过程中的姿态角数据进行实时解算,并与陀螺测量到的滚转角数据进行比较。试验结果表明:利用该方法解算滚转角准确度在4°以内,能够满足火箭弹弹道修正的要求。     

电磁屏蔽材料在火箭弹包装中的应用

在分析火箭弹意外发火,瞎火原因的基础上,提出了利用屏蔽材料对火箭弹包装进行改进的相关技术。     

火箭弹起始扰动的仿真与试验研究

目的 研究火箭弹起始扰动的形成与减小火箭弹起始扰动的技术途径。方法 通过计算机数值仿真和射击试验,对影响火箭弹起始扰动的因素进行分析。结果 得到了发射过程中各种扰动因素对火箭起始扰动影响的量值。结论 推力偏心、动不平衡、弹管间隙、俯仰体振动及车体振动对火箭弹起始扰动的影响较大,应该在火箭武器系统设计中对此加以考虑。     

敷设粘弹性材料的溜槽的试验模态分析

针对传统溜槽振动和噪声非常大的情况,设计了内部自由敷设粘弹性阻尼层的溜槽。文中应用了锤击激励法和LMS test. Lab振动测试系统对内部敷设粘弹性阻尼层的溜槽进行了模态试验,得到了前6阶固有频率、阻尼和振型,经过模态置信准则检验,所测试验模态参数真实有效。通过对试验结果的分析发现溜槽出口处的振动为扭转振动和弯曲振动的叠加,加工时应该加强出口处的强度以减小局部振动。研究结果为敷设粘弹性阻尼层的溜槽的优化设计提供了参考。     

泡沫铝层合结构矿用溜槽的减振降噪性能研究

为了降低煤矿溜槽工作时的噪声,探索溜槽降噪的新途径,提出将泡沫铝层合结构用于制造矿用溜槽。针对溜槽工作的特点,设计泡沫铝层合结构矿用溜槽的新结构,并运用理论分析和实验分析的方法对其减振降噪性能进行研究。结果表明,用泡沫铝层合结构制造溜槽,可提高溜槽的降噪及环保性能。     

POWDER FLOW MONITORING USING MICROWAVE DOPPLER RADAR

A computerised, microwave Doppler effect flowmeter has been developed and applied to the flow of model powders down a chute. The instrument enabled the velocity and distribution of velocities of moving powders to be determined simultaneously.

The velocity profiles on a 1.8m stainless steel chute of rectangular cross-section have been obtained for sand in the size range 355-425µm at chute inclinations ranging from 30 to 65 degrees. Freely accelerating flows, which occurred at high chute inclinations, led to beds of open structure while flow at lower angles led to much denser beds being formed. A greater range of velocities existed within the denser beds at low angles than was present in the more open beds at higher angles.     

刮板细度计非接触测量数据处理研究

对基于光谱共焦技术搭建的刮板细度计斜槽面深度测量装置的非接触测量数据进行处理算法研究.引入高斯滤波对整段测量数据进行滤波分析,再分左上平面、右上平面、斜槽底面三段进行高斯滤波,分离三个测量面的表面粗糙度信号及波纹度信号,解算出粗糙度值.对于高斯滤波中线,利用最小二乘法进行拟合,结果表明左右上平面的直线倾斜度一致,可拟合...     

EFFECT OF MASS FLOWRATE ON POWDER FLOW VELOCITIES

The effect of mass flowrate on powder velocities during flow down a chute and in free fall from a hopper was studied using a microwave Doppler technique. The velocities on an inclined chute, which was either smooth or had its surface roughened by coating with a layer of the sample, increased as the mass flowrate increased; this effect was most significant at large angles of inclination. Free fall from a hopper also led to higher velocities being monitored as the mass flowrate increased.

The distribution of particle velocities was also estimated; during flow on a chute at high angles of inclination the distribution of velocities was greater for low flowrates while at low angles, where the powder only just managed to flow, the trend was reversed. There was no difference in the distribution of velocities measured for the free fall of particles as the mass flowrate varied.     

齿轮箱轴断裂分析

采用化学成分分析、断口分析、金相检验和力学性能测试,对某齿轮箱轴发生断裂的原因进行了分析。结果表明：其断裂模式为疲劳断裂,起源于退刀槽尖角位置,直角退刀槽造成应力集中产生疲劳裂纹;而原材料的锻造和热处理工艺不合理,加速了轴的疲劳断裂。     

Cellular automata model of gravity-driven granular flows

A cellular automata model is used to simulate a variety of granular chute flows. The model is tested against several case studies: flow down a chute, flow past an obstacle, chute flow in which complex, counter-rotating vortices result in streamwise surface stripes and flow near a boundary. The model successfully reproduces experimental observations in all of these cases. These results lead us to propose that simple, rule-based, models such as this can improve our detailed understanding of dynamics and flow within an opaque granular bed.     

峨口铁矿放矿明溜槽爆破成形

峨口铁矿为了解决东区采场的矿石出路问题，决定增建两条放矿明溜槽。本文简述了溜槽工程地质概况，详细地介绍了溜槽的爆破成形设计方案，分析了爆破效果。     

散状物料转载系统设计DEM仿真方法的研究

颗粒仿真技术可以对散状物料的运动进行观察、机理分析、受力分析、磨损(寿命)估计和系统优化.比较了散状物料转载计算方法,给出了采用DEM方法的建模与模型检验的基本步骤.针对DEM计算方法存在所需计算时间过长的问题,实验比较了降低剪切模量和增大颗粒粒度等方法对DEM计算时间和实验结果的影响,结果表明,在不影响计算结果的前提下可通过降低剪切模量和增大颗粒粒度来缩短DEM仿真计算时间.利用EDEM软件实现了散料转载过程的可视化,比较分析了直线型溜槽、折线型溜槽和曲线型溜槽中物料转载效果.仿真表明：采用变曲率半径效果更好;U型溜槽截面能够减少物料不对中情况的发生.     

Granular chute flow regimes:mass flowrates,flowrate limits and clogging

It has previously been shown that the transition from supercritical to subcritical behavior in granular chute flows often results in the formation of stagnant zones which limit the mass flow and eventually clog the chute. This paper reports an analysis of previously unpublished data for the flow of cohesionless granular material in inclined open channels. Three regimes of mass flow behavior, supercritical and two regimes of subcritical flow, were observed and are characterized by their dependence on chute inclination and geometry. (This paper represents the first report of the third flow regime.) Analysis of the experimental findings lead into empirical/mathematical expressions for the mass flow in the first two regimes as well as a prediction of the regime transition points for all three regimes. This last gives insight into the effect of chute geometry on regime transition and the subsequent clogging of chutes.