带式输送机的结构及常见故障分析

针对火力发电厂燃料输送系统输送设备带式输送机运行中出现的故障进行介绍,重点对带式输送机的主要结构设计及带式输送机在使用过程中的常见故障的原因进行了分析并提出了解决故障的办法。     

可伸缩带式输送机传动部改造成功

在煤矿采集工业中,常常使用连续输送机械来增加工作的效率,在众多输送机中使用频率最高的就是可伸缩带式输送机。可伸缩带式输送机有着复杂的结构和系统,所以在工作中会出现一些故障,从而影响了可伸缩带式输送机的工作效率,造成重大的经济损失。本文主要介绍了可伸缩带式输送机的设计,分析了传动装置的组成结构,提出了可伸缩带式输送机传动部的改造措施。     

带式输送机的常见故障分析及预防探究

带式输送机在各领域有着广泛应用,在散状物料输送方面有着一定优势,但一些各种故障的发生,极大降低了设备使用效果及安全性。本文将具体分析带式输送机使用过程中常见的故障表现及原因,基于此提出相应的故障处理对策,以保证带式输送机运行更为平稳、安全,满足各项生产需求。     

基于EDEM对带式输送机系统的改造与分析

针对某商品混凝土搅拌站骨料带式输送机系统升级改造过程中出现的问题为研究对象,运用离散元EDEM软件仿真模拟了骨料输送过程,通过对仿真结果和现场问题对比,分析了问题产生的原因,提出了相应的解决方案。经过对系统结构的改进和现场调试,解决了带式输送机系统出现的问题,满足了业主的要求。验证了离散元EDEM软件辅助研发设计带式输送机的可行性,为相关设计和建设者提供了一些分析方法和设计思路。     

大型倾斜上运带式输送机的逆止及制动

随着工业的发展,具有大倾角、长距离、高带速、大运量特征的大型带式输送机已成为带式输送机的发展趋势。带式输送机作为散状物料输送系统中的重要组成,其正常运行是整个输送系统正常工作的重要保证。当整个物料输送系统需要紧急停运或输送系统中的某条带式输送机出现故障需要停机时,系统要求所有带式输送机以输送线路方向为停机顺序,快而准地处于停止状态。此时系统PLC将会依次向所有带式输送机分别发出驱动电机断电信号、制动器抱闸信号。     

煤矿选煤厂带式输送机集中控制系统应用

针对当前煤矿选煤厂带式输送机在运煤过程中出现大块煤矸卡带、输送机跑偏、断带等现象,导致带式输送机集中控制难度大、输送机故障率高,输送机出现故障后无法及时处理的问题,永定庄选煤厂通过技术研究,决定对带式输送机采用一套远程集中控制系统。该系统通过使用后,实现了输送机断带、跑偏、卡带等远程集中控制管理,降低了输送机故障率,取得显著应用成效。     

传感器在带式输送机保护控制系统中的应用

在煤矿井生产过程中,现代科学技术的应用十分广泛,生产效率在不断增加,提升了煤矿企业的经济效益。在煤矿井上下生产系统和选煤系统中,带式输送机自动化装置中对传感器的应用较为广泛,能不断提升带式输送系统的自动化水平,确保对带式输送系统的可靠控制,提升其运行效率,为煤矿企业的现代化发展打下坚实基础。本文通过对传感器在带式输送机保护控制系统中的应用进行分析,希望为实现煤矿企业的经济效益与社会效益提供一些参考意见。     

煤矿带式输送机常见故障与改善方法

针对运输机在井下作业过程中可能出现的各类机械故障,对带式输送机常见的皮带跑偏、减速机故障和托辊失效这三类主要故障类型的发生原因进行了分析,并根据发生原因提出针对性的优化措施,以提高带式输送机在生产运行中的设备稳定性。     

煤矿带式输送机常见故障分析及处理措施探究

煤矿带式输送机是煤炭开采必备的机械设备,在实际使用过程中易受到工作环境以及自身作业时间的影响而出现各种故障,基于此,为了促进我国煤矿开采行业的进步和发展,分析了煤矿带式输送机的常见故障,并针对故障进行防范措施的探究,以期为相关带式输送机常见故障提供一定的参考。     

带式输送机的缓冲支座

带式输送机受料段的输送带通常用缓冲托辊支承。在露天矿输送系统中,物料块度很大、转载落差又高,缓冲托辊很容易出现故障。这不仅增加了维修费用,而且影响带式输送机的正常运行。为此,瑞典TRELLEBORG     

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.