基于PLC的双面钻孔组合机床控制系统的改造

采用西门子s7-200系列可编程控制器（PLC）对双面钻孔组合机床的控制系统进行技术改造,并介绍了双面钻孔组合机床的工作过程,给出了PLC控制的I／O端子接线图和梯形图程序。实践证明,改造后的双面钻孔组合机床在实际生产中运行稳定,生产效率大大提高。     

基于S7-200PLC的双面钻组合机床控制

介绍了怎样利用西门子S7-200PLC实现的双面钻组合机床的控制,给出了控制系统硬件配置和主要控制程序.将PLC应用于双面钻组合机床控制,提高了剪板机运行的稳定性和可靠性,生产效率明显提高.     

PLC在双面钻削组合机床电气控制改造中的应用

分析了双面钻削组合机床的工作原理和控制要求,确定了输入和输出元件,选择PLC机型、设计PLC输入／输出接线和梯形图,利用欧姆龙小型PLC机取代传统的电气控制,实现了双面钻削组合机床的改造。     

双联泵机床动力滑台新回路的PLC控制

阐述了PLC在动力滑台的液压传动控制系统中的应用,在组合机床动力滑台原液压回路的基础上,引入一种新的、用于实现动力滑台运动的二工进新回路。新回路具有独自调节与能量消耗较低等特点。     

双面钻孔组合机床控制系统设计

双面钻孔组合机床是一种双面同时钻削并同轴钻孔、钻削较厚工件的加工钻床。介绍了双面钻孔组合机床控制系统的总体方案设计,提出将PLC应用于组合机床控制系统中。详细列出了机床各个工序的过程,画出了系统的工步流程图,并对控制系统的硬件接线图进行了设计,有效地提高了系统的稳定性。     

用PLC改造双面钻孔组合机床控制系统

从机床自动控制的实际需要出发，利用PLC对双面钻孔组合机床的电气控制系统进行了改造，并给出了其PLC控制系统的硬件设计和梯形图程序。     

卧式两工位双面钻孔组合机床的PLC自动控制

为了提高卧式两工位双面钻孔组合机床工作效率,减少设备维修工作量,运用三菱PLC技术取代原继电器控制,对传统设备进行了技术改造.在对机床工作过程及控制要求调研的基础上,设计了PLC的I/O接线图和程序梯形图,并逐步分析说明所设计程序的运行功能,经上机模拟调试,运行结果与实际生产要求一致.     

基于PLC的钻孔组合机床控制系统设计

针对传统钻孔组合机床用继电器-接触器来对液压系统进行控制时出现的控制性能不好且控制系统设计和调试困难等问题,采用可编程控制器（PLC）控制方式来替代继电器-接触器控制组合机床中的动力滑台液压系统,并使用了触摸屏技术.开展了对动力滑台液压系统工作流程的分析,选择三菱PLC型号,进行了PLC硬件和软件控制系统的设计,在计算机上利用三菱编程软件GX-Developer进行了编程,以及利用仿真软件GX-Simulator进行了模拟调试,以保证满足机床使用要求.研究结果表明,该种控制系统及其设计方式既提高了钻孔组合机床控制系统的可靠性、维护的方便性等工作性能,同时也提高了设计效率.     

C5225立式车床主传动改造及PLC控制的实现

在保留C5225立式车床原主传动变速机构不变的基础上,将机床的液压16级手动变速改造为液压4级无级变速。采用英国欧陆590＋全数字直流调速器以及PLC控制替代原有的电气控制系统。经改造后,机床的主传动性能得到较大提高。     

基于电液传动的多功能机床结构及控制系统设计研究

针对现有液压机床加工工序单一、自动化生产效率、以及加工精度不足等缺点,为实现机床高效率、多功能加工生产,设计了一种基于电液(液压和电机)传动的多功能机床及控制系统。首先,设计了多功能机床的基本结构、工作原理及工位分布;然后对机床控制系统进行了整体设计,包括主控器PLC选型、电液元器件型号选择、I/O分配以及PLC控制系统梯形图设计编程;最后,结合实际程序编程和安装完成的机床控制系统进行了现场实验数据采集测试,测试数据结果表明:设计的电液传动多功能机床及控制系统稳定效果好,能够快速实现多工序加工,提高了生产效率。     

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.