固液复合润滑体系的摩擦学行为研究进展

随着空间高新技术工业的日益发展,对高性能润滑材料的要求日益增强,单一的润滑材料已经无法满足其发展需要求。固液复合润滑体系相比单一润滑材料具有更优异的摩擦学性能,已被广泛的开发和利用在不同的科学技术领域。对近年来固液复合润滑体系的研究进展和现状进行综述。     

浅谈卧式挤压机挤压模具的结构改进设计

本文介绍了卧式挤压机挤压模具的结构改进设计,并对各种结构设计的优缺点进行了分析、总纳,改进后的模具结构可降低成本、提高质最．具有显著的经济效益。     

锂电池铝合金外壳落料拉深复合模具设计

分析给定尺寸的锂电池铝合金外壳成形工艺,介绍锂电池铝合金外壳落料拉深复合模具结构和设计特点。经生产证明：模具结构简单,零件满足质量要求,取得良好的技术经济效果。     

固液分离用水力旋流器的设计

本文系统地分析了影响固液分离用水力旋流器性能的诸因素，总结了有关诸因素的研究成果，从而对该类旋流器的参数设计提供了有效指导。     

基于主模型模具并行设计的实现

给出了主模型的概念．分析了主摸型的数据结构，探讨了主模型下并行设计的实现.以面板模具凸凹模设计为例．将主模型并行设计思想应用到模具设计中。     

聚氯乙烯内挤压挤出模具的设计

传统的外挤压挤出模具应用非常广泛,经过改进设计,采用内挤压挤出模具,不但小巧玲珑,使用较小的压缩比,可减小制品的内应力,获得较高的外观及内在质量;相对于机筒,机头的反作用力小,有利于加工成型;成型段的尺寸可适当减少,有利于高速挤出成型等。     

液固循环流化床换热器管束的固含率

在二维中试循环流化床中使用组合式固液分布器进行实验,考察下管箱表观液速,主分布器内径、主分布器下插深度,颗粒加入量和粒径对径向管束固含率的影响.结果表明:固含率随主分布器内径、颗粒加入量和下管箱表观液速的增加而增大,随粒径的增大而减小,随主分布器下插深度几乎没有变化;固含率不均匀度随颗粒粒径的增大而增大,随下管箱表观液速、颗粒加入量,主分布器下插深度增加而减小,但达到一定深度后,不均匀度不再随之减小,随主分布器内径几乎没有变化.在综合考虑各影响因素的基础上,提出计算固含率的经验公式,并用实验数据拟合了公式中的参数.     

液固分离技术的进展

本文简述了液固分离技术近年来的进展。特别涉及加压电过滤设备、毛细吸附作用下的真空过滤机、动态过滤技术、新型卧式螺旋卸料沉降离心机、滤材等方面技术的国内外进展情况。     

塑料门窗用胶条后共挤模具的设计

介绍了塑料门窗用胶条后共挤模具的设计过程,并提出了渐变增压式流道、增设预热块、螺钉点定位等设计思路。采用渐变增压式流道有效保证了挤出压力;增设预热块延长了与塑料异型材复合位置的加热时间,进而提高了胶条与塑料异型材的黏结强度;采用螺钉对塑料异型材进行点定位,使得挤出阻力减小,有效提高了挤出速度。生产实践证明,此后共挤模具定位准确、操作简单,有效解决了塑料异型材定位不准、胶条黏结不牢等问题。     

新型共挤吹塑薄膜机头

介绍了目前国际上最新的吹塑薄膜机头，重点介绍各种叠加机头的结构特点及应用。     

微波连续硫化橡胶制品的挤出口型设计

系统讨论了微波连续硫化橡胶密封条生产线的橡胶制品专用挤出口型设计的基本构思和方法步骤，并具体分析了异形挤出制品的口型设计。     

液固旋流分离器的设计与选用

主要介绍了液固旋流分离器的工作原理,尺寸设计原则、结构设计与材料选用,并对烧碱蒸发浓缩工序中盐碱分离用旋流分离器的选用提出参考意见.     

The hydrodynamic behavior of the liquid-solid circulating fluidized bed ion exchange system for cesium removal

In this work, experimental studies on the hydrodynamics have been carried out in a cold model liquid-solid circulating fluidized bed (LSCFB) ion exchange system where the riser is operated in the circulating fluidization regime and the downcomer in the state of slow-moving packed bed, with the aim of removing cesium from high radioactive liquid waste. Two circulating fluidization zones, the initial and the fully developed, have been observed. The solids circulation rate can be controlled merely by the primary liquid flow if the auxiliary liquid flow is set to zero and the injection tap is located at the middle of the intersection of the riser and the solid-return pipe. Therefore, it is possible to minimize the number of the liquid feed assemblies (pumps, valves, flow meters, etc.), and this is crucial to the treatment of high radioactive waste. The liquid inevitably leaks through the solid-return pipe in most cases because of the “loosening effect” of the liquid feed flow, and the direction and magnitude of the leakage vary with the operating conditions. The system geometry, including the injection tap location and the riser outlet location, plays a very important role in the hydrodynamics of the LSCFB system.     

多腔精密医用导管机头结构及口模设计研究

介绍了较佳的多腔精密医用导管机头结构,并对两类典型多腔精密医用导管的机头定型段流场进行了数值模拟分析,获得了出口截面上的速度分布图。同时研究了截面上沿最大壁厚路径及最小壁厚路径上的速度分布,提出了整个截面速度均匀性的定义。此外,综合实际挤出过程中注气这一特征,给出了修正后的口模截面形状,同时进行了定型段流场的模拟。结果表明:修正后口模截面的速度均匀性和壁厚均匀性都有了很大的提高,这对同类机头的结构设计及口模截面的确定具有较强的参考价值。     

异型材挤出口模的优化设计

本文将工程优化设计方法和聚合物流变学应用于异型材挤出口模设计,提异型材挤出口模优化设计数学模型,并在微机上实现了异型材挤出口模的优化设计。     

Gas-liquid and liquid-solid mass transfers in two types of stationary catalytic basket laboratory reactor

Measurements of gas-liquid and liquid-solid mass transfer coefficients were performed in two types of three-phase laboratory reactor equipped with stationary catalytic basket and multiple impeller. Those reactors are called Robinson-Mahoney reactors. Local liquid-solid mass transfer coefficients were measured using naphtol particle dissolution in n-heptane at several agitation speeds. Experiments had shown that local coefficients depended on the particle locations in the basket and agitation speeds. The local coefficient values and profiles were quite similar for both studied reactors even though the reactor designs were different. Similar values of RM basket thicknesses might account for this phenomenon because the liquid-solid mass transfers could be correlated with the ones in packed beds with forced liquid circulation. Gas-liquid mass transfer coefficients were measured using standard dynamic absorption methods in air-water or hydrogen-gas oil system. As in stirred tanks, the gas-liquid mass transfers were linked to the impeller designs and characteristics (gas-inducing or classical impeller) and to the operating conditions such as agitation speeds and fluid properties. However, correlations applicable to stirred tank reactors can be used with Robinson-Mahoney reactors, the baskets behaving like additional baffles or reduction of tank diameters.     

铜合金轴承保持器压铸模具设计

采用SolidWorks软件进行一种铜合金实体轴承保持器压铸模具设计，并在MasterCAM软件实现了模具主要零件动模镶块的模拟CAM加工。     

多用启瓶器的模具设计

本设计以提高生产率及材料利用率为出发点,采用两套模具进行该启瓶器的设计：第一套级进模完成冲孔、拉深和落料;第二套模具为楔块式弯曲模,用来完成两次弯曲成形。这样既可以保证较高的材料利用率和生产率,又能够使模具的结构得到简化。