赛摩物料自校准皮带秤荣获“中国轻工业联合会科技进步奖”

<正>2015年2月,中国轻工业联合会授予赛摩电气股份有限公司"物料自校准皮带秤"项目"中国轻工业联合会科技进步奖"。三桥自校准皮带秤采用赛摩专有的标准物料叠加校准技术,解决了皮带秤多年来不易实物校准的世界难题,可以在现有的皮带输送机上,以低成本实现皮带秤的在线自动物料校准。电子皮带秤在广泛应用的同时,它的校准面临着困难,电子皮带秤的校准方法很多:电子校准、挂码校准、链码校准、循环链码校准和实物     

非标准托辊间距与标准托辊间距电子皮带秤挂码校准系数的比较

本文针对非标准托辊间距时电子皮带秤的挂码校准时试验重量杠杆比的计算提供一种计算方法,以方便现场电子皮带秤的挂码校准。     

汽车衡检定的移动式设备

挂码校秤是一种校准电子皮带秤比较简单实用的方法.但在实际操作过程中,由于皮带秤的秤体结构不同,同样重量的砝码即使放置的方法和位置相同,对秤体的作用效果却不同.本文介绍几种秤架结构在进行挂码校秤时的计算方法.     

浅谈防爆称重传感器的认证及选用

挂码校秤是校准电子皮带秤比较简单实用的一种方法.但在实际操作过程中,由于皮带秤的秤体结构不同,同样重量的砝码即使放置的方法和位置相同,对秤体的作用效果却不同.本文介绍几种秤架结构在进行挂码校秤时的计算方法.     

托辊间输送带长度的计算

带式输送机托辊支撑间的输送带由于物料和输送带本身重力的作用产生挠曲，此挠曲线随着输送带张力的不同而变化，从而引起输送带几何长度的变化，在输送机系统动力学分析时应考虑此因素，本文导出了此挠曲线的悬链线方程，进而得出输送带的长度与张力的关系式，将按悬链线计算的输送带长度计算式简化得到了按抛物曲线的输送带长度计算式，通过数值分析说明：当挠度小于２％时其误差在１０＾－６ｌ以下。分析表明：在输送机的低张力式     

电解铝单槽出铝计量控制系统

挂码校秤是校淮电子皮带秤比较简单实用的一种方法.但在实际操作过程中,由于皮带秤的秤体结构不同,同样重量的砝码即使放置的方法和位置相同,对秤体的作用效果却不同.本文介绍几种秤架结构在进行挂码校秤时的计算方法.     

皮带秤称量台位置设计新论(下)

现有公开文献对于皮带秤称量台位置设计的论述尚不完备、严谨。本文指出皮带秤称量台的合理位置应设在输送带速度稳定,且所输送的物料速度同输送带的速度相等之处,仅仅考虑避免装在皮带张力变化大的区段是远远不够的。基于动力学和运动学原理分析了输送带与物料的运动状态,进而提出称量台与物料装入点的距离应设计成不短于物料自装上输送带起直至同输送带等速的时间段内输送带所通过的行程。为此,应当充分顾及输送带坡度、输送带额定速度、物料的滑动摩擦因数、物料装到输送带之后初期的加速度等基本力学参数。最后作了举例说明。本期刊登的是全文的下篇,主要内容为运用动力学和运动学的基本原理分析了物料同输送带等速的条件,介绍了所推导的计算公式。     

偏载工况下输送带横向跑偏检测系统设计

为实时、精准检测出因偏载导致的输送带横向跑偏事故,设计了偏载工况下输送带横向跑偏检测系统。该系统由激光扫描仪、光电编码器、Arduino UNO开发板、5G通讯模块和上位机等组成。激光扫描仪获取输送带物料流截面激光点云,结合光电编码器获取的输送带带速,经网络传输子系统传输至上位机。上位机拟合物料流截面轮廓并计算物料流区域截面面积,通过计算单位时间物料流截面上各托辊承载物料质量计算输送带横向跑偏量,从而实现输送带横向跑偏检测及预警。     

散料输送系统转运站料流的仿真分析

针对散状物料转运站部件受冲击力大、磨损严重等问题,运用EDEM软件对转运站内物料流动状态进行数值模拟,得到了转载溜槽出口处的物料速度,同时对转运站输送带上的物料质量进行监测.通过对不同转载角度、不同结构形式的转载溜槽时物料的运行状态进行仿真,结果表明,当转载角度不同时,需要选用相应结构形式的转载溜槽才能保证物料转运的平稳性,减小物料对转运站部件的冲击和磨损,为转运站的设计提供了理论依据.     

输送带翻转段长度计算

通过分析输送带在正常工作状态的张力,在带边产生的附加应力及自重等因素,推导出输送带回程分支翻转段合理的最短长度计算公式.     

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.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.