药品冻干机自动装卸料系统研究

分析了药品冻干机自动装卸料系统功能,给出了设计方案,讨论了功能实现方法.采用模块化设计思想,设计了系统总体结构,对各个机构功能和实现方法做了简要分析,对控制系统进行了较详细的研究.选择西门子S7-300 PLC为控制器,设计了系统硬件结构.阐述了系统软件设计方法、设计过程,编写了PLC控制系统程序,实现了整个自动装卸料过程的自动控制.     

料斗式自动装卸料机构

本文阐述了 A21/1滚齿机用料斗式自动装卸料机构的工作原理、电磁振动料斗的主要参数及调整方法,着重介绍了重心偏移很小的异径小轴的可靠定向方法,简略地介绍了该装卸料机构的设计计算步骤。对设计电磁振动料斗和同类型上下料机构有一定的启发和参考价值。     

爬坡自卸料车

自动装卸料不仅可以加快各种物料的周转速度,而且可以大大降低工人的劳动强度。当装卸料的空间高度受到限制而无法安装起重机又不适合用其他提升机构进行装卸料时,如果采用图示的“爬坡自卸料车”,可以使繁重的卸料工作实现机械化。爬坡自卸料车是我们在生产实践中革新制造的一种简易自动卸料装置。它结构简单,使用方便,适用装卸各种砂     

AP1000装卸料样机提升机构的国产化设计

对比了AP1000装卸料机主提升机构与秦山二扩装卸料机及宁德装卸料机主提升机构的布置形式和机构特点。对样机的主提升机构重新进行优化设计,使其具有维护便利、经济性好的特点。     

基于ADAMS的后装式压缩垃圾车卸料机构优化设计

在保证垃圾能卸载干净和一定箱体尺寸要求的条件下,为求得在最小卸料油缸推力下的后装式压缩垃圾车卸料机构各参数,对后装式压缩垃圾车卸料机构进行模型简化、模型分析和力学分析,应用ADAMS建立它的参数化模型,对其进行了优化仿真分析,得出了合理的推卸油缸的安装角度、推板折弯斜度和推板深度。为后装式压缩垃圾车推板机构选取几何参数及合适的卸料油缸提供了依据。     

带式输送机自动卸料机构的应用研究

针对目前带式输送机卸料在使用过程中存在的基建工程量大、落料冲击大、磨损严重的问题,提出了一种新的带式输送机自动卸料机构。其通过结构优化、装配工艺优化、应用材料优化,提高了卸料机构的应用灵活性和可靠性。根据实际应用表明,新的带式输送机自动卸料机构能够将安装时间缩短11.4%,将对刮板输送机的落料冲击降低28.8%,卸料效率提升9.8%,极大地提升了自动卸料机构的应用经济性和可靠性。     

锻件自动卸料机构

制造轴承套圈、圆螺母等环套类零件的毛坯,大多采用热锻套料、挤压成形、切底等工艺方法。一般中小企业现行生产过程中,都是手工卸料,屡有事故发生。本文介绍三套锻件自动卸料机构。其工作时都是利用压力机滑块的动力和弹簧的作用力,动作简单可靠,卸料准确无误,具有一定的实用价值。 1.套料、切底自动卸料机构 套料和切底工序自动卸料机构的工作原理相同,结构见图1。     

基于PLC的钒氮合金自动卸料装置的控制系统研究与设计

为提高钒氮合金烧结矿生产的自动化程度,根据现代生产企业的需要,研究设计了适用于大型冶金烧结厂的自动卸料设备的控制系统。通过使用PLC控制驱动步进电机,带动Y/Z直线移动机构、夹紧机构、翻转机构、打散机构进行运动,完成烧结矿自动卸料的一系列动作。实现了烧结矿卸料的自动化,节省了企业的成本,减轻了现场作业工人的劳动力度以及提高了安全性。     

液压随动仿形技术在车床上的应用

在大批量生产中,利用液压随动系统对形状比较复杂零件进行仿形加工,即容易保证加工质量,又能大幅度的提高生产率,减轻工人劳动强度。若再配装自动装、卸料机构,即可实现单机自动化。液压随动仿形与机械仿形相比,有两大优点:一是液压仿形触头与模板压力小(一般只有1-2kg),模板的磨损小,寿命长,可长     

自动装卸料的双V形块杠杆夹具

双Ｖ形块杠杆夹紧机构是一种典型的机床夹具结构。具有时中作用，定位误差小、结构简单，在机床夹具设计小得到广泛应用。介绍了一种用于圆形棒料零件的自动装卸料双Ｖ形块杠杆夹紧夹具工作原理及有关设计计算。     

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.     

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....     

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。     

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.