印刷机收纸链条横向振动的研究

链条振动直接影响到印刷机的收纸质量以及整机性能;利用多自由度系统振动理论对印刷机收纸链条进行建模分析、微分方程求解,从而得到链条横向振动的固有特性;通过对激振频率的求解,得到引起链传动系统共振的临界转速,从而有效地避开共振.     

单张纸印刷机收纸链条的优化设计

在现代的高速单张纸印刷机上,收纸装置常常都采用链条传送机构,而传统的收纸链条选取方法多为盲目试凑法.该法设计过程烦琐,设计周期过长,且不能公认最优.本着机械优化设计的思想,采用内点惩罚函数法对该机构的收纸链条重新进行了一次设计,优化效果明显.     

海德堡速霸CD74收纸装置改进,生产力再度飚升

2006年10月15日至18日,在美国芝加哥举办的印刷业展览会上,海德堡公司展出了一台改进了收纸装置的速霸CD74胶印机,并向观众们展示了其非凡的生产力。收纸系统中全新的驱动概念是展览会上的亮点,这是为了使机器达到高效的纸张制动而专门设计的。     

给纸机递纸吸嘴机构共轭凸轮设计

根据给纸机递纸吸嘴机构的运动特性与工艺条件,给出了适合印刷速度高于15,000印张/h的给纸机递纸吸嘴机构共轭凸轮廓线的设计方法,通过选定或设计从动件运动规律进行共轭凸轮机构设计,这样可以确保凸轮机构具有良好的运动和动力性能;为高性能、高速度的给纸机设计提供了研究基础.     

印刷机改进型导轨设计及仿真分析

在收纸链轮的啮出点设计改进型导轨中,以消除由于加速度突变造成的冲击与振动,对于提高国产印刷机的速度、精度和印刷质量,缩短国产机与国外先进印刷机的差距有重要意义.     

高速取纸机构设计与仿真分析

目的 利用机构实现取纸机在高速取纸时无纸间摩擦的目的。方法 明确无纸间摩擦情况下取纸吸头的姿态和动作要求。利用凸轮连杆机构的运动特点,并考虑高速运动中凸轮机构运动规律要求,设计凸轮五杆机构取纸机构。利用Adams仿真验证机构运动情况。结果 通过分析凸轮五杆机构连杆上两点的位移变化,获取作为吸头的凸轮五杆机构的连杆运动情况。通过机构的运动仿真分析可知,吸头在取纸时以垂直于纸面的姿态作间歇平动,实现了预定目标要求。结论 利用凸轮五杆机构能够很好地实现高速、无纸间摩擦取纸。     

单张纸印刷机理纸部纸张的空气动力学分析与机构优化

目的 提高单张纸印刷机理纸机构的理纸效率,使纸张快速、平稳地降落到收纸台上,从而提高整个印刷机的工作速度。方法 本文从空气动力学的角度,对单张纸印刷机高速运行状态下待收的纸张进行受力分析,构建单张纸印刷机理纸机构气流的空气动力学模型,用于指导理纸机构的优化。结果 提出了基于空气动力学分析的胶印机理纸机构优化思路,对南京造币公司J20型印刷机的理纸机构进行了优化改进。实验结果表明,优化后的机构理纸故障率减少了30%左右。结论 该研究对印刷机理纸机构的机构设计与优化开创了一个新的思路,此优化设计的机构收纸故障率明显降低。     

单张纸胶印机咬纸牙开闭机构运动规律反求

为减小复制进口机器凸轮时的误差,使复制的凸轮具有或超过原始凸轮的运动性能,通过运用矢量法对某企业生产的单张纸胶印机咬纸牙开闭机构中,凸轮的运动规律进行反求,得到了类似于简谐运动的实际从动件运动规律,从而为分离出原始开闭牙凸轮的综合误差,改进从动件的运动性能,提高整机的动态工作性能提供科学依据.     

纸质机械运动机构设计研究

目的 实现玩具类产品的机械运动机构的纸质化.结合纸材料的力学特性,探索纸材料应用于机械产品制作的可行性,以及基于纸材料的机械零件结构的设计方法.方法 依据纸材料本身的特性,结合机械运动机构的传动方式,思考纸质机械机构设计的方式,总结出转动副、移动副、齿轮等各类典型机械运动机构纸质化设计方法,在实现运动功能的基础上确保运动零件的力学强度.同时以纸质齿轮设计为例,利用CorelDraw作为二次开发平台开发插件,降低纸质机械机构设计的操作难度.结论 以机械玩具产品为案例,对纸质材料力学特性的机械机构设计方法进行实践,论证了低成本机械玩具创意设计方法的可行性,为机械产品创意设计探索了新的材料选择,也为纸产品创新发展提供了更多的设计概念.     

新型送纸架的设计与控制分析

在蜂窝纸的加工生产线中,送纸架用来安装纸筒并不断给后续设备提供纸张.由于原有纸架自动化程度低,性能较差,降低了生产效率,并有可能破坏纸张输送.为此借助虚拟分析软件进行送纸架的运动学仿真,以保证整体动作的协调性;同时对设备关键部位的合理性进行动力学分析,以检验是否符合要求;在此基础上完成设备的LOGO程序控制和接线图.目前该新型送纸架应用到了蜂窝纸生产线中,并取得了良好的效果.     

一体式托架缓冲防护结构设计与有限元分析

目的 为解决快递末端配送中存在的回收体系不完善,快递的不安全性,快递员与消费者沟通少,快递员拒绝上门配送等问题。方法 通过层次分析法建立快递末端配送体系的模型,并通过模糊综合评价,得出消费者对于目前快递末端配送的评分。结果 环境效益的权重为0.665,表明消费者较为重视,然而经济效益的权重为0.104,表明消费者较易忽视。同时,建立了快递末端配送综合效益与指标体系的关系式,时间成本的权重最高为0.619,运输成本的权重最低为0.097,表明消费者较为注重时间成本,较易忽视运输成本。综合评价得出消费者对现有快递末端配送的评分结果为75.09分,满意度为中等。结论 提出了快递市场规范化,制定了快递回收机制,合理分配快递末端配送投入方式以及给出了一些APP或小程序的优化建议,为我国快递末端配送提供借鉴。     

试论民爆器材管理实行“零库存”的可行性

为了确保民爆器材在使用、储存、运输环节的安全,提出了一种基于专卖公司配送爆破器材的新管理模式———"零库存"。文中介绍了在中山市试行"零库存"管理模式的概念,阐述了这种管理模式所带来的社会效益。此外,对全面推行"零库存"管理模式的必要性和可行性进行了详细的讨论。     

无人机在军事物流领域的应用探析

目的 分析无人机的特点优势,提出无人机在军事物流领域应用的模式。方法 通过归纳总结、对比分析等方法,设计无人机在军事物流领域的典型应用场景,结合目前存在的问题差距提出针对性对策建议。结果 使用无人机进行物资投送保障不受复杂道路条件制约,能有效解决军事物流末端保障难题。结论 无人机在军事物流领域的应用前景十分广阔,但当前仍需解决无人机环境适应性、用途多样化、物资投送包装等方面的问题。     

关于空调冷冻水输送能效比计算的一点看法

本文针对在《公共建筑节能设计标准》（GB50189—2005）中提出的空调冷冻水输送能效比计算公式不能满足复杂、新型空调方式（如多级泵系统、冷辐射系统等）的要求,提出了根据空调计算冷负荷分布的“加权法”对整个水系统的输送能效比进行计算的新方式,供设计研究人员进行参考。     

社交媒体时代信息流广告设计传播策略思考

目的提出在社交媒体时代,信息流广告设计传播的策略。方法对当前我国的信息流广告的特征进行分析,包括延展广告创意与表现的空间、精准投放建立有效的触达机制、建立拟人情感联系、门槛多阶化、变现效率高等。结论提出鼓励社交平台的信息互动、以质取胜、把握热点事件引爆话题、定制设计与监管标准等相关策略。     

火工品包装技术研究

介绍了火工品包装概况,提出了火工品包装的通用技术要求,确定了包装容器的类型和常用的包装方法,提出了火工品防护包装设计中应考虑的因素,探讨和提出了火工品包装件的检验方法及验收规则,划分和确定了火工品防护包装等级和装箱等级。     

Comment on “Topical Delivery of Avastin to the Posterior Segment of the Eye In Vivo Using Annexin A5‐Associated Liposomes”: Topical Liposomal Bevacizumab Results in Negligible Retinal Concentrations

The previously published report suggests that liposomes, functionalized with annexin‐5, can deliver bevacizumab to the retina after topical administration as eyedrops. Topical delivery of bevacizumab would be an attractive alternative to the current treatment that involves monthly intravitreal injections to the eye. In this Comment, the retinal concentrations of topically applied liposomal bevacizumab are compared to the levels reached after intravitreal injections. The comparison reveals that the topical liposomal delivery results in retinal bevacizumab concentrations that are about 3–5 orders of magnitude below the lowest bevacizumab concentrations during clinical treatment with intravitreal injections. Major improvement is needed before topical bevacizumab delivery can be considered clinically feasible.     

Measurement and Analysis of Vibration Levels in Two and Three Wheel Delivery Vehicles in Southeast Asia

Different types of small vehicles such as two‐wheel and three‐wheel motorcycles are commonly used for domestic delivery in many countries in Asia, particularly in Southeast (SE) Asia. These types of vehicles are mostly used for delivery of packages in the last leg of the supply chain. This study was initiated at the Technical Council meeting of International Safe Transit Association to understand the vibration levels that exist in delivering packages in SE Asia for the ‘last leg’. The study measured the vibration levels that are experienced by packages in Thailand and Indonesia. The delivery process in these countries uses two‐wheel and three‐wheel light vehicles to deliver printers and small packages. However, this portion of data and testing has often been overlooked by packaging test standards used in North America and Europe to design and test packages during the development process. The ‘last leg’ delivery method discussed has generally been considered the fast, convenient and flexible way of product delivery. Data recorders were mounted on the vehicle floor to measure acceleration levels during delivery in commonly used routes in the major cities in these two countries. Measured data in this research show that the vibration levels in these ‘last leg’ delivery routes are actually lower than those measured in truck and container shipment across road and rail transportation in North America that has been previously studied by the authors. Vibration levels in the two‐wheel vehicles with rear trunk containers were higher than those in the three‐wheel vehicles. Copyright © 2015 John Wiley & Sons, Ltd.     

Measurement and analysis of delivery van vibration levels to simulate package testing for parcel delivery in Hungary

In the past several decades, there continues to be an increase in both domestic and international online and catalogue shipments that requires an increase in shipments and handling of parcels by single parcel delivery companies. This study measured the vibration levels that occur in parcel delivery shipments from pickup to delivery, especially the sections involving delivery vans and small vehicles over ground road transportation in Hungary. Goods that were shipped in the regions studied almost always travel at least once by van on varying road conditions such as motorways, main, side or city roads to deliver parcels to the final destination. The aim of this paper was to provide an understanding of vibration levels that occur during van transportation that can be used to pre‐shipment test new packages to prevent damage. The measured acceleration‐time data were analyzed in terms of power spectral densities (PSDs) and presented with statistical data to provide an understanding of the variability of intensity. The separated and averaged vibration levels that were measured in this study were compared with the American Society of Testing and Materials and the International Safe Transit Association vibration profiles for pickup and delivery vehicle in the form of PSD spectrums. Based on the analyzed data of this study, PSD spectra were provided for various route conditions as well as composite spectra, which can be used to simulate the measured vibration conditions representing van shipments.     

聚电解质的制备与应用研究进展

文中综述了聚电解质的合成及应用研究进展,探讨了聚电解质制备过程中的影响因素。此外还着重介绍了聚电解质-表面活性剂复合物、层层自组装膜、聚电解质微纳胶囊在药物缓释以及聚电解质在改善纳米材料的制备及性能方面上的应用研究进展。如何开发特定结构的聚电解质,利用聚电解质对外界环境的刺激实现对聚电解质形态结构的实时和有效控制是聚电解质科研领域研究的重点方向。