选煤厂末原煤脱泥筛入料溜槽的优化改造

针对选煤厂末原煤在末原煤脱泥筛入料水冲溜槽中物料分配不均匀的问题,通过调整溜槽的设计结构和冲水位置,达到布料均匀的效果。工程实际运用表明,水冲溜槽优化设计改造后,物料通过水冲溜槽后进入筛面布料更加均匀,提高了末原煤脱泥筛的脱泥效果,降低了生产介质损耗,提高了经济效益。     

泡沫铝层合结构溜槽设计及其性能分析

为探讨提高煤矿溜槽减振降噪的新途径,以某选煤厂的原型溜槽为研究对象,设计了泡沫铝层合结构溜槽,应用有限元仿真软件分析两种溜槽的静、动态特性,得出了溜槽的应力-应变分布图、前5阶模态振型图及其固有频率和谐响应幅值图。对比两种溜槽的静、动态特性,结果表明,泡沫铝层合结构溜槽具有更优越的力学性能,可达到提高溜槽减振降噪特性的目的的效果。     

麻家梁矿溜槽设计的工业实践

介绍了溜槽断面和溜槽倾角参数的选择,分析了溜槽的线路和设计,针对溜槽工作中存在的噪音问题提出了相关的解决措施,旨在提高煤矿的承载效率和运煤效率。     

关于颚式破碎站的事故分析与技术改造

针对选矿公司颚式破碎站棒条筛的基础平台坍塌和棒条筛的入料溜槽80%以上固定螺栓发生松动、断裂等问题,公司进行了事故分析和技术改造,彻底解决了棒条筛基础平台坍塌和入料溜槽固定螺栓发生松动、断裂的问题,消除了安全隐患,避免了设备和人身的事故的发生,保证了矿山公司和选矿公司的正常运行,同时为公司创造经济效益约600万元。     

一种新型均匀布料溜槽的设计与研究

布料溜槽是破碎、筛分系统环节前的一个重要关键部件,其可靠性、布料效果好坏关系到整个破碎、筛分环节的运行稳定。本文提出了一种新型均匀布料溜槽,并对其结构、功能及实施方式进行了详细分析,可使物料能够均匀分布在破碎、筛分设备工作面宽度方向上,提高设备的寿命,增强设备的工作效率,减少故障率和维修费用。     

齿辊式滚轴筛在西曲选煤厂准备车间的应用

针对西曲矿选煤厂2019年7月在原煤准备车间首部皮带机前设计安装了齿辊式滚轴筛的应用实践,介绍了原煤准备车间的生产工艺流程,以及齿辊式滚轴筛的结构、工作原理及主要特点,详细分析了齿辊式滚轴筛运行中存在的问题和解决方法以及齿辊式滚轴筛投入运行后产生的经济效益。     

一种选煤厂用智能防堵溜槽的设计分析

为防止选煤厂溜槽出现堵塞现象,基于溜槽堵塞原因,研究了排堵方法,设计了一种智能防堵溜槽,介绍了该种新型智能防堵溜槽的结构组成、防堵原理、执行机构以及上位机人机界面.该智能防堵溜槽系统可实现溜槽的智能防堵,更好地保障物料运输系统的高效运输.     

洗煤厂重介浅槽分选机改造及应用效果分析

针对永红煤矿洗煤厂采用先进重介浅槽分选工艺对井下原煤和矸石进行分离洗选期间设备故障频发的问题,对重介浅槽分选机进行改造设计分析.实践应用表明,该设备改造后可以有效降低矸石物料对洗选工艺中的重介质旋流器、溜槽、弧形筛设备造成的冲击压力,大幅度降低故障发生率,应用效果理想.     

选煤厂溜槽设计

基于溜槽布置的原则,从溜槽断面积、溜槽断面形状和溜槽倾角三方面介绍了确定溜槽断面和倾角的方法,分析了溜槽的耐磨性、降噪性和缓冲方式,并针对煤块破碎问题,特介绍一种防破碎装置,即拨轮防破碎溜槽,以期为同行提供参考。     

块煤仓螺旋溜槽防破碎方案研究

防破碎螺旋溜槽主要用于防止运输和储存环节块煤的破碎。介绍了块煤的破碎原因、螺旋溜槽的结构及仓体内螺旋溜槽的布置形式,阐述了块煤筒仓内螺旋溜槽防破碎的功效。并通过对筒仓内螺旋溜槽安装形式的改进,进一步强化了螺旋溜槽的稳定性。     

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.     

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。     

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....     

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.