RFSJ-16便携式热凤预热挤出塑料焊机

由青岛一点塑料焊接设备责任有限公司制备的RFSJ-16便携热风预热挤出式塑料焊机是引进国外先进技术，精心研制的新型热风焊机，其技术指标均达到国外同类产品要求，填补了国内空白。热风预热与塑料焊条挤出与一体，结构合理，操作方便，焊接连续、工作效率高、挤出压力大，使焊接强度大幅度提高，是对各种热塑性塑料进行焊接加工的理想产品。     

直管对接摩擦焊机

一、直管对接摩擦焊机的组成我厂设计制造的直管对按摩擦焊机是采用摩擦焊接原理将二根无缝直钢管对接而成。该机已安装在我厂省煤器蛇管生产线上,经多年实践使用,焊口质量良好。     

新型超声波焊机的研制

我院新研制的超声波焊机与电子管、三极管、晶闸管超声波焊机相比,具有体积小、重量轻、价格低、功率大、抗干扰能力强、工作稳定可靠和微机自动跟踪频率等优点。能够实现塑料与塑料之间的焊接,塑料与金属之间的连接,异种金属之间的焊接,同时还可广泛应用于塑料工业、汽车、家电、电子工业、玩具及包装等领域中。现将新型超声波焊机的技术参数、工作原理及应用实例介绍如下。     

大功率CO2激光焊机焊接技术的研究与应用

本文简要介绍了大功率CO2激光焊机焊接工艺技术特点,重点阐述了激光焊接工艺参数和特性参数与激光焊机焊接质量之间的关系及其在生产实践中解决焊机焊接质量缺陷的应用。     

连退机组焊接质量影响模型及其影响因素的研究

针对连退机组焊机焊接带钢过程中焊接参数无法完成优化配置、技术人员无法定量分析焊接质量的问题,考虑连退机组焊机的设备与工艺特点,在分析焊接质量综合影响模型的基础上,选择典型规格带钢,对碾压轮压力、焊机压力、焊接电流、搭接量、焊接速度等影响焊接质量的因素进行了定量分析。通过调整上述因素,使焊接质量综合目标函数值控制在一定范围内,进而获得焊接参数的浮动范围,并根据最优焊接工艺参数进行现场验证,满足了工厂带钢焊接质量需求。同时,将该连退机组焊接质量综合影响模型应用于国内某连退机组焊机实践生产,开发了相应软件,提高了机组的带钢生产效率与成品带钢的焊接质量预报精度。     

基于锅壳式锅炉平管板的埋弧自动化焊接工装研究

实现锅炉筒体焊接的全部自动化,难度在于平管板部位的环缝内侧焊接,特别是最后一道组合焊缝。由于施焊条件差,埋弧自动焊焊机不能进入筒体内部施焊。采用改进的工装的埋弧自动焊进行焊接,可以实现该处环向对接接头的自动化焊接。降低了生产成本和劳动强度,提高了工作效率和焊接质量。     

基于储能的移动式钢轨闪光焊机供电系统优化设计

铁路是世界上最重要的载客交通工具之一，而无缝铁路的轨道焊接是轨道安全运行的关键技术之一。传统的移动式钢轨闪光焊机因其柴油发电机组怠速运转和三相负荷严重不平衡会产生大量燃油消耗问题。针对这一问题，研究了一种新能源移动式钢轨闪光焊机。该设备在传统移动式钢轨闪光焊机的基础上，优化发电机组功率，通过使用储能单元及高功率逆变器设计一种“增程式”的供电系统。首先针对钢轨闪光焊机的供电系统进行原理阐述，确定设计的基本原理和使用设备的基本参数。接着对其电源质量、焊接接头质量以及经济性进行实验分析。实验结果表明，此次设计的新能源移动式钢轨闪光焊机极大地减少了能源的消耗，电源质量和焊接接头质量优秀。     

棒料工具摩焊不牢探因及解决办法

<正> 棒料工具生产厂为节省成本,均采取柄刃部选用不同材料对接而成,以前采用低压大电流闪光焊工艺,闪光焊耗能大,焊接面容易夹渣,留下易折断的隐患。焊接工作场所也因大量闪光火花四溅而较为恶劣,现在已逐渐被摩擦焊工艺所替代。很多工具厂都拥有GMH—20磨焊机,该摩焊机为早期产品,动作设计得不尽合理,对操作安全、焊接质量带来一定问题。现将我们使用     

压力表自动钎焊机的设计与焊接工艺

本文介绍了一种用于钎接压力表机座与Ｃ型弹簧管的钎焊机的设计，采用可编程序控制器（ＰＣ）控制，能够进行自动和非自动焊接。焊机结构紧凑，操作方便，焊接工艺及质量稳定可靠。     

基于PIC单片机的逆变电熔焊机设计

电熔焊是塑料压力管道的重要焊接方法.主要介绍了一种基于PIC单片机的逆变电容焊机的研制,详细阐述了IGBT逆变开关电源、控制系统的硬件结构和软件流程.研制的焊机具有轻巧、节能等优点.     

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.