掘进机掘进测距闭锁控制装置的研究

介绍了一种新型掘进机掘进测距闭锁控制装置,主要由美国API公司的激光追踪仪和3D传感器,以及PLC控制柜组成。使掘进机在掘进过程中,配合"掘前探水",实现自动测距、自动启停作业,减少了人力强度,提高巷道掘进作业的自动化,可大大提高巷道掘进作业的安全性和可靠性。     

履带式全液压坑道钻机在巷道掘进中的应用研究

为了探究一种巷道掘进高效探水设备,以小庄煤矿40302工作面运输巷为研究对象,采用理论分析和现场调研的方法研究了履带式全液压坑道钻机在巷道掘进探水中的应用。结果表明：传统坑道钻机在巷道掘进探水中具有体积大、结构松散的缺点;履带式全液压坑道钻机具有结构紧凑、安全高效、劳动强度低等优点,利于其在巷道掘进探水中的应用;40302运输巷采用履带式全液压坑道钻机掘进探水后,掘进效率提升21%。     

EBZ200T型掘探一体机的分析与应用研究

山西沁源梗阳煤业井下工作面采用传统钻机进行探放水钻探施工时,存在单次探水时间长、巷道掘进单进水平低等问题,为提高探放水钻探施工效率,提高巷道掘进单进水平,设计EBZ200T型掘探一体机,并在梗阳煤业6202工作面运输顺槽进行了工业性试验。结果表明,EBZ200T型掘探一体机能实现掘探连续作业,使得单次探水时间大幅度降低,巷道掘进单进水平明显提高,为企业创造了较好的安全经济效益。     

采空区探放水施工技术应用分析

针对15109回风顺槽前期掘进期间受邻近15107采空区积水影响,巷道顶板及巷帮出现淋水现象,严重威胁着巷道安全快速掘进的问题,南河煤矿地测防治水科分析了巷道掘进前期探放水施工存在的不足,并根据巷道掘进现状,对采空区提出了合理有效的探放水设计,并对探放水施工期间提出了合理有效的安全技术措施.通过实际应用效果来看,探放水...     

煤矿地质探水钻孔新型封孔装置的应用分析

针对传统地质探水钻孔封孔工艺落后,探水钻孔封孔后在放水施工中经常出现钻孔渗水、钻孔管窜动等现象,以北辛窑矿2102巷为例,分析了巷道掘进前期地质探水钻孔封孔工艺主要存在的问题,并根据实际生产情况,提出了新型封孔装置。通过实际应用效果来看,该封孔装置大大提高了探水钻孔封孔效果,封孔合格率由原来的54%提高92%以上,保证了掘进巷道探放水施工安全,取得了显著应用成效。     

ZKXG100型钻孔成像轨迹检测装置在煤矿探放水中的应用

针对传统探水钻孔施工过程中因无法实时对钻孔区段煤岩性进行采集、分析而导致的钻孔施工时盲目性大、钻孔段煤岩体岩性参数不准确等技术难题,掌石沟煤矿地测防治水科通过技术研究决定在探放水施工过程中安装ZKXG100型钻孔成像轨迹检测装置,通过在15201回风顺槽掘进期间探水施工中应用效果来看,该装置自动化水平高,对钻孔壁岩体成...     

倾斜巷道探放水自动排水装置应用分析

基于牛山煤矿90105综采工作面切巷在探放水施工过程中，由于巷道倾斜角度大，探水钻孔探放水流直接流入切巷入口低洼处，导致切巷内水流量大、设备损坏严重，积水无法及时有效排出工作面，不仅影响着巷道快速掘进，而且严重威胁着巷道探放水施工安全的问题，牛山煤矿通过技术研究，在巷道内安装了一套自动排水装置。通过实际应用效果来看，取得了显著应用成效。     

定向技术在掘进巷道探放水施工中的应用

为了提高掘进巷道探放水施工效率及精度、降低劳动作业强度,潞安集团漳村煤矿地测科通过技术研究,对2301运巷顶板富水区采取定向技术进行探放水施工,通过实际应用,采取定向技术后提高巷道探放水施工速度,解决了巷道掘进期间水患影响的问题。     

煤矿探放水钻孔新型封孔装置的分析与应用

以大塔山煤矿有限公司塔山白洞井2105巷为例,分析了在进行巷道掘进作业前期,探放水钻孔封孔作业存在的主要问题,提出应用一种新型封孔装置.经实际应用表明,通过应用该新型封孔装置,可有效改善探放水钻孔封孔效果,可使白洞矿的探放水封孔合格率从70％提高至95％以上,进一步提高了掘进探放水施工作业的安全性.     

基于视觉识别及红外人身检测的掘进安全闭锁装置的研究

针对基于视觉识别及红外热释人身检测的掘进工作面人员安全闭锁装置,阐述了闭锁装置基本原理,介绍了装置总体工作过程。该装置可及时防止生产过程中作业人员误入危险区域引发的意外伤害。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.