简易转包机替代电动转弯溜子的改造

电动转弯溜子的驱动轴和联轴节的使用寿命只有3~4个月,有时甚至轴承或减速器轴也损坏。一种简易转包机,制作简单,无需动力驱动,即可实行转弯输送。用简易转包机替代电动转弯溜子,不仅节约电力消耗,还节约维护费用。     

乙烯装置急冷油循环泵减速机与透平侧高速齿轮联轴节的国产化设计

介绍了高速齿轮联轴节的使用性能和高速齿轮联轴节国产化设计的方法－内齿联轴节和外齿联轴节的设计（选取材料，热处理方法，精度等级，参数，几何尺寸，误差检测项目，结构的确定），高速齿轮联轴节的强度校核；高速齿轮联轴节工作图的绘制以及高速齿轮联轴节在使用中的互换性。     

弹性缓冲减震联轴节的研制

弹性缓冲减震联轴节的研制李永超周腊生（武汉市橡胶工业总公司研究所４３００１５）李虹李泽斌［武汉钢铁（集团）公司能源总厂４３００８３］弹性缓冲减震联轴节（以下简称联轴节）是某进口空压机组的传动联接件。由于每台空压机上有６个联轴节（每一联轴节上有２个轴套...     

注塑机联轴节疲劳断裂的ANSYS仿真分析

联轴节是注塑机注射装置的核心部件之一,主要针对中型机注射联轴节存在剪切断裂现象,对其工况进行分析,应用ANSYS软件对联轴节进行有限元强度分析,优化联轴节的结构来达到设计使用寿命。     

袋装水泥皮带式电动转弯溜子的改进

某水泥公司在袋装水泥装车系统中,配套使用袋装水泥皮带式电动转弯溜子,用于改变水泥袋在皮带输送机中的输送方向,使水泥袋水平转动90°。在使用中,转弯溜子出现皮带轮驱动轴及联轴节等时常损坏的现象,其原因是皮带轮内驱动轴只有一个轴承支承（见图1改进前）,皮带轮工作时处于悬臂状态,     

MH-92/314型压缩机联轴节事故的紧急处理

介绍了MH－92／314型压缩机联轴节事故情况，分析了事故原因，并提出了不更换联轴节，而采用二次铰孔的快速处理方案。     

选粉机联轴节的改进

选粉机联轴节的改进赵国方江苏省镇江市船山水泥厂（２１２１１３）我厂Φ３．５ｍ离心式选粉机与Φ２．２ｍ×６．５ｍ球磨机配套。在生产过程中，发现减速机与选粉机联轴节柱销经常磨损或折断，将柱销孔磨成椭圆形状，并引起振动，必须更换联轴节才能解决问题。更换时，...     

离心压缩机止推轴承瓦温高原因分析与改进

分析离心压缩机组止推轴承瓦温高的原因,通过计算联轴节的预拉伸量,使膜片热态下的变形最小,根据实际情况增加或减少联轴节预拉伸量．以保证其轴承瓦温在正常范围。     

立磨辅助传动系统的改进

生料立磨常用的主传动和辅助传动系统见图1。主电动机采用双轴伸,辅助传动采用摆线针轮减速器,由操作手柄操纵联轴器,两半联轴节分离,主电动机起作用;两半联轴节合上,辅助传动接通。     

利用激光对中仪对动设备联轴节进行对中找正

介绍了一种用化工厂动设备安装时联轴节打正对中的新仪器－激光对中仪的结构形式１特点及其应用，使联轴节对中找正工作变得十分简便易行。     

QXQ70/24悬臂侧取式刮板取料机行走机构改造

针对某水泥企业一台QXQ70/24悬臂式取料机运行过程中存在行走机构频繁打齿的问题,进行了详细的技术分析与思考;在此基础上,就改造中设备的选型与设计进行了讨论。按所定的方案改造后,该取料机在一年多的生产运行中,其行走机构未再发生打齿故障。     

A microscopic study of fracture in regenerated cellulose film

The fracture edge of a strip of regenerated cellulose film broken under tension can usually be divided into three regions: (A) the site of the initial failure, (B) the slow-tear region, and (C) the fast-tear region. Photomicrographs showing these regions are presented and discussed. Three different types of initial failure are described and some data presented relating the breaking strain to the type of initial failure.     

Shock-induced breaking of the nanowire with the dependence of crystallographic orientation and strain rate

The failure of the metallic nanowire has raised concerns due to its applied reliability in nanoelectromechanical system. In this article, the breaking failure is studied for the [100], [110], and [111] single-crystal copper nanowires at different strain rates. The statistical breaking position distributions of the nanowires have been investigated to give the effects of strain rate and crystallographic orientation on micro-atomic fluctuation in the symmetric stretching of the nanowires. When the strain rate is less than 0.26% ps^-1, macro-breaking position distributions exhibit the anisotropy of micro-atomic fluctuation. However, when the strain rate is larger than 3.54% ps^-1, the anisotropy is not obvious because of strong symmetric shocks.     

The breaking strength of imperfect (real) polymer fibers

The thermodynamic fusion theory of strength of perfect polymer fibers of finite molecular weight is extended to include imperfect (i.e. real) fibers of incomplete crystallinity and orientation. Approximate equations for failure strength, strain, and work of failure are derived by extracting from the real visco-elastic fiber an equivalent reversible component suitable for thermodynamic analysis. This is facilitated by an explicit relationship between fiber breaking stress, σ_*, and breaking strain, _*, which is shown to be σ_*=0.632K_* (K=modulus) for constant strain-rate deformations. It is shown that fiber breaking time is equivalent to the fiber visco-elastic mechanical relaxation time. Experimental data shows that the activation energy of rupture of polyethylene fibers is not the activation energy of covalent bond rupture. Instead it agrees with the activation energy expected of crystal melting in accordance with the fusion theory of rupture. The activation volume of the polyethylene fibers also agrees with the value expected from this theory.     

Evaluation of breaking characteristics of elementary high-modulus filaments from the extension diagram of a bundle

Conclusions A procedure has been developed for determining the breaking characteristics of elementary filaments by testing in a bundle.A formula has been proposed for calculating the coefficient of variation in the breaking load of elementary filaments using the figure for total work to failure of a bundle.Experimental checking has shown good agreement between results from the proposed procedure and traditional methods.Translated from Khimicheskie Volokna, No. 6, p. 26, November–December, 1989.     

邻二甲苯泵用机械密封的失效分析

针对国产化过程中，邻二甲苯泵用机械密封工作时产生的故障，进行了失效分析。为邻二甲苯泵用机械密封的改造提供了依据。     

低界面热阻改性氮化铝和多壁碳纳米管充填PVDF构建杂化三维网络及其导热性能强化

通过对多壁碳纳米管(MWCNT)和氮化铝(AlN)颗粒进行不同的改性,提高其分散性以及与聚偏氟乙烯(PVDF)基体的界面相容性,降低界面热阻。通过溶液共混后再用热压法将填料与基体的混合物压制成致密的薄膜,提高PVDF的导热性能。TEM测试证明改性后的填料分散性能提高,SEM证明两种填料成功地在PVDF基体中构成三维杂化网络结构。当填料含量50%时,a-AlN-PVDF复合薄膜的热导率达到原膜的300%、断裂强度变为原膜的92%。当MWCNT与AlN的体积比为1∶1、改性混合填料的质量分数为50%时,热导率变为原膜的565%,断裂强度变为原来的51%。     

Acousto-ultrasonic (AU) Technique for Assuring Adhesive Bond Quality

This paper examines the feasibility of using the Acousto-Ultrasonics (AU), nondestructive technique, for assuring the quality of adhesively bonded sheet-metal used for automobiles. Kissing bonds or regions lacking adhesive were easily identified by this technique. A bond quality (BQ) model is introduced that takes into account the mixed mode failure. Destructive testing results showing fairly consistent correlation of BQ values with the breaking strength of the adhesive joint failing in mixed mode failure are presented.     

Hysteresis in rubbers and its influence on strength

The most important dissipative mechanisms contributing to hysteresis when a rubber is stretched to breaking point are discussed. A quantitative examination of the influence of hysteresis on the work required to break the rubber produces a sensitive criterion of failure for a number of rubbers with and without carbon-black filler.     

热解炭微观结构对炭/炭复合材料力学性能的影响

以PAN基针刺纤维毡为基体,采用等温化学气相渗透技术,在温度1000℃、压力5.0~20.0 kPa条件下制备了2种具有不同微观结构热解炭的炭/炭复合材料,研究了其力学性能与热解炭微观结构的关系. 结果表明,压力8.0 kPa下得到的具有单一低织构热解炭的炭/炭复合材料的断裂强度较高,为86±3 MPa,热解炭与炭纤维间界面结合紧密,加载过程中二者同时断裂,呈现明显的脆性断裂行为;压力10.0~20.0 kPa下得到的具有中织构-高织构-中织构热解炭的炭/炭复合材料的断裂强度稍低,为82±4 MPa,加载过程中材料内部不同织构热解炭间多层次界面通过改变裂纹扩展路径而延缓其扩展速度,断口形貌呈现锯齿状,表现出假塑性断裂特征.