GBT－24胶管编织机的研制

ＧＢＴ－２４胶管编织机是一种新型的五月柱型编织机，主要用于胶管中间层的编织，是我国编织机的换代产品。其结构由滚动式代替传统的滑动式，锭子包裹式弹簧控制释放点，扭簧控制张力，具有转速快，编织质量好，生产效益高，便于维修，安全可靠等特点。     

钢丝编织机杠杆式摩擦锭子的设计与分析

在传统摩擦式锭子的基础上,对钢丝编织机锭子制动方式进行改进,扩大了张力的调节范围。通过精简钢丝编织机锭子结构,扩大了锭子容量,延长了钢丝编织机连续作业的时间,可提高钢丝编织胶管的产量。同时利用有限元分析软件ANSYS对改进后的钢丝编织机锭子支架进行有限元分析,检验了其可靠性。     

GBG-SW型中速钢丝编织机

为满足用户的要求,开发了GBG-SW型中速钢丝编织机。本文介绍了该机的主要结构,编织原理,技术参数,以及主要特点等。     

GBG—48L型立式电缆编织机

介绍了GBG－48L型立式电缆编织机的锭子，传动原理，电气原理及性能参数。     

编织机导向盘常见铸造缺陷分析

编织机导向盘是编织机的重要部件之一，其质量优劣将直接影响编织机技术性能和使用寿命。文章指出了编织机导向盘常见铸造缺陷的原因，并对各种原因进行了分析、讨论。     

国内外钢丝编织机锭子机理剖析

文章较系统地对国内外钢丝编织机锭子的结构及工作原理进行了分析、对比。文章指出,中、高压胶管的骨架层性能将直接影响到胶管的抗压、抗弯、抗脉冲能力;影响中,高压钢丝编织胶管质量的因素除内胶管物理性能和钢丝合股悬垂度外,还有编织机锭子的结构、性能、质量等。文章通过对钢丝短锭子、长锭子、摩擦锭子、225～11型、MR—11型及RB—2型等锭子的综合分析、对比后得出:RB—2型锭子密线量大,张力范围广,放线平稳、磨损少且结构简单、紧凑,可以较大幅度提高编织机的编织速度。如能结合我国实际情况,消化吸收,加以改进完全可以应用在国产编织机上,届时将大大改善国产编织机的性能,提高编织胶管质量。     

几种钢丝编织机的结构和工作性能(上)

文章较系统地对国内外四种钢丝编织机的编织机构及工作原理进行了理论分析,指出影响编织胶管质量的因素除合股钢丝悬垂差、锭子结构外,还有编织机编织机构的结构、性能等,并且它也是影响编织胶管生产率的主要因素之一。本文对国产GBG型、美国洛克维尔公司生产的TMW225-Ⅱ型、RB-2型、美国梅尔公司生产的MR-11型等编织机的编织机构进行了综合分析.     

GBG-SW24钢丝编织机

介绍了GBG-SW24钢丝编织机的研发背景、主要结构、编织原理、技术参数、主要特点等。该机编织质量好,生产效率高,具有很好的市场推广价值。     

XBP—24型方盘根编织机

介绍了ＸＢＰ－２４型方盘根编织机的结构，重点介绍了该机的工作原理以及编织成方盘根所需的特殊轨迹。     

新产品介绍

新材质钢丝编织机导向盘研制成功国产钢丝编织机导向盘是编织机的关键部件,其使用性能直接关系到编织机的生产效率、编织质量与设备的使用寿命,工况条件要求它既要耐磨,又要防震、减震、抗冲击。为保证设备能高速运转,对这些性能要求尤其严格。国产钢丝编织机,由于受导向盘材质的     

数控车床主轴故障维修实例分析

在实际生产中,以机床出现的真实故障为例,分析机床主轴驱动系统的控制原理,分析故障流程图。结合机床的相关资料制定维修计划,确定排除故障的最佳方法,从而缩短维修时间提高维修效率。     

CNG 锭带快速粘接工艺的研究

介绍了ＣＮＧ锭带快速粘接所需胶粘剂的制备及粘拦工艺及其影响因素。     

Chromosome Segregation in the Oocyte: What Goes Wrong during Aging

Human female fertility and reproductive lifespan decrease significantly with age, resulting in an extended post-reproductive period. The central dogma in human female reproduction contains two important aspects. One is the pool of oocytes in the human ovary (the ovarian reserve; approximately 10⁶ at birth), which diminishes throughout life until menopause around the age of 50 (approximately 10³ oocytes) in women. The second is the quality of oocytes, including the correctness of meiotic divisions, among other factors. Notably, the increased rate of sub- and infertility, aneuploidy, miscarriages, and birth defects are associated with advanced maternal age, especially in women above 35 years of age. This postponement is also relevant for human evolution; decades ago, the female aging-related fertility drop was not as important as it is today because women were having their children at a younger age. Spindle assembly is crucial for chromosome segregation during each cell division and oocyte maturation, making it an important event for euploidy. Consequently, aberrations in this segregation process, especially during the first meiotic division in human eggs, can lead to implantation failure or spontaneous abortion. Today, human reproductive medicine is also facing a high prevalence of aneuploidy, even in young females. However, the shift in the reproductive phase of humans and the strong increase in errors make the problem much more dramatic at later stages of the female reproductive phase. Aneuploidy in human eggs could be the result of the non-disjunction of entire chromosomes or sister chromatids during oocyte meiosis, but partial or segmental aneuploidies are also relevant. In this review, we intend to describe the relevance of the spindle apparatus during oocyte maturation for proper chromosome segregation in the context of maternal aging and the female reproductive lifespan.     

Controllable synthesis of micronano-structured LiMnPO4/C cathode with hierarchical spindle for lithium ion batteries

LiMnPO₄/C with hierarchical spindle structures was synthesized by a facile solvothermal method at 180?℃ for 10?h. The morphology and structure of the prepared materials were controlled through the adjustment of hexamethylenetetramine (HMT). The synthesized materials were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Quantachrome instrument(Quabrasorb SI-3MP) and Fourier transform infrared spectroscopy (FTIR), and so on. The prepared LiMnPO₄/C exhibits good electrochemical performance, for instance, there are 153.2, 126.3, 110.2?mA?h?g^?1 at 0.05?C, 1?C, 2?C respectively. The promising properties of the materials results from unique hierarchical nanostructures and the uniform thin carbon coating of particle surface, which improve the ionic and electronic transfer of LiMnPO₄.     

纱锭输送系统专用设备可行性解决方案

针对当前炭纤维厂家在纤维纱锭的输送过程中存在的同题,提出了全电动力源纱锭输送系统的可行性解决方案,该系统具有定位准确,运行稳定等特点.     

包覆纱工艺对亚麻增强预型件的麻纤维分数和拉伸性能影响

基于增强体亚麻纱线和热塑性丙纶长丝,通过包覆纱纺纱工艺研究了包覆纱纺织预型件及其复合材料的加工性能.通过对中空锭捻度和空心锭转速的单因子研究分析,研究表明,中空锭捻度和空心锭转速是影响包覆纱预型件的纤维体积分数和拉伸性能的两个主要因素.并利用二次通用旋转设计的方法,建立回归分析实验模型,来优化组合中空锭捻度和空心锭转速的参数以得到结构均匀的包缠纱线和预型件.结果表明,该包缠纱适合于生产均一的预混料,可用于形成纺织结构预型件及复合材料.     

喷嘴可调式喷射器性能的实验研究

海水淡化系统中,负荷的变化要求热力蒸汽压缩器（Thermal Vapour Compressor）的流量也随之改变,但要求TVC的出口压力尽量不随之改变。因为系统的正常运行对出口压力对应的饱和温度很敏感,如果饱和温度过高,会导致系统内部结构腐蚀严重,降低使用寿命,甚至危害整个系统的正常运行。引入可调式喷射器,对其性能进行实验研究,测量并分析了喷针在不同位置时,可调式喷射器的压力、流量和喷射系数的变化。结果显示,在需要改变流量的时候可以保持喷射器出口压力基本不变。     

Frequent Spindle Assembly Errors Require Structural Rearrangement to Complete Meiosis in Zea mays

The success of an organism is contingent upon its ability to faithfully pass on its genetic material. In the meiosis of many species, the process of chromosome segregation requires that bipolar spindles be formed without the aid of dedicated microtubule organizing centers, such as centrosomes. Here, we describe detailed analyses of acentrosomal spindle assembly and disassembly in time-lapse images, from live meiotic cells of Zea mays. Microtubules organized on the nuclear envelope with a perinuclear ring structure until nuclear envelope breakdown, at which point microtubules began bundling into a bipolar form. However, the process and timing of spindle assembly was highly variable, with frequent assembly errors in both meiosis I and II. Approximately 61% of cells formed incorrect spindle morphologies, with the most prevalent being tripolar spindles. The erroneous spindles were actively rearranged to bipolar through a coalescence of poles before proceeding to anaphase. Spindle disassembly occurred as a two-state process with a slow depolymerization, followed by a quick collapse. The results demonstrate that maize meiosis I and II spindle assembly is remarkably fluid in the early assembly stages, but otherwise proceeds through a predictable series of events.     

机床主轴静特性的计算机模拟和参数优化

为避免简化力学模型给机床主轴系统静特性分析计算带来误差,在总结国内外研究成果的基础上,提出“卸积木式”力学模型。在优化方法上,对传统的复合形法作了改进,加快了收敛速度。该软件不仅提高了计算精度,而且通用性强,使用方便。     

层叠床面回转耙式连续搅拌物料的理论分析及应用

主要探讨了散状物料在层叠床面上的分布与运动规律，通过机械设计计算理论分析和热模试验，推导出物料运动轨迹方程，得出了物料在床面上的停滞时间与参变量以及耙叶推动物料所耗功率与参变量的关系，为工业上实际应用提供了理论基础。