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四连杆液压挡轮是一项消化引进的新技术。该装置与普通液压挡轮的区别,在于它的四连杆机构应用杠杆原理,挡轮推力得到杠杆比的放大作用,油缸可以在较低的压力下工作。它具有技术参数优越、传动平稳、不拉缸、不泄漏,工作效率高和使用寿命长等优点,用在回转窑上是一种理想的液压挡轮装置。 相似文献
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本文介绍了液压技术在回转窑上应用的实例。如托轮轴承端部液压指示器、调整托轮液压千斤顶、挡轮液压装置和托轮的自调支承等。 相似文献
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建立了回转窑实验装置,通过冷态实验研究了回转窑转速、倾角、内径、窑尾挡料圈高度等操作参数和结构参数对物料停留时间的影响。结果表明,物料在回转窑内的停留时间分布近似正态分布;物料停留时间随着回转窑转速、倾角和内径的增大而缩短;窑尾挡料圈高度对物料停留时间影响较复杂,转速小于2.5 r/min时,窑尾挡料圈高度的增加使物料停留时间延长,而当转速大于2.5 r/min时,窑尾挡料圈高度的增加反而使物料停留时间缩短;在某一固定回转窑倾角时,物料停留时间与物料质量流率的乘积与单位转速内物料质量流率近似成线性关系。 相似文献
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由于750/80液压旋回破碎机的液压缸设计不合理,在运行过程中,液压缸里的中摩擦盘因转动产生的离心力使其偏离球面定位而甩出,并碰擦上衬套而出现故障。改进设计:在中、下摩擦盘中心孔的空间设置1个挡轮,制止中摩擦盘沿径向运动。实践证明,这一改进设计是成功的。 相似文献
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液压支架是综采的主要配套设备,发挥着支护综采工作面顶板、提供安全采掘作业空间和为采运设备提供动力的作用。如果在煤矿井下面向煤壁侧无防护挡矸装置,煤壁塌落时大量煤块易涌入垛式液压支架内部,造成支架内部零部件损坏及操作人员人身伤害。为此,文中设计了安装在垛式液压支架靠煤壁侧的挡矸板装置,阐述了挡矸板的设计方案和挡矸板的结构,分析了制作挡矸板时产生焊接变形的原因及种类,采取了塞焊法、刚性固定法及合理的装焊顺序等防止变形的措施。 相似文献
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在电控机械式自动变速器的设计中,换挡执行机构的设计是重点和难点,其性能的优劣,将直接影响整车的平顺性、舒适性和安全性。以某5挡手动变速箱为基础,根据换挡执行机构的设计要求,开发设计了一款电控液压式换挡执行机构。对液压系统进行了分析,设计了该换挡执行机构的液压系统,并对液压系统的主要元件进行了计算和选型;根据该换挡执行机构、液压原理图和选换挡液压缸分析了该换挡执行机构的工作过程;实际制作了该选换挡执行机构,并对对应的5挡MT变速器进行了AMT改造。试验表明:该选换挡执行机构能够实现该5挡变速箱的选挡和换挡,并且结构简单、定位准确、反应灵敏,换挡品质安全可靠,具有较好的推广应用价值。 相似文献
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冉隆明 《组合机床与自动化加工技术》1964,(1)
一、自驱式动力头 我国现用自驱式液压动力头运动的特点是:运动主要借助液压挡铁由液压控制板操纵,电气系统只操纵快速向前与快速退回(当加工行程准确度要求不高且不需要在动力头加工完毕就发出电气信号时也可采用液压挡铁退回)。为了深入了解电气控制系统的作用,必须先了解动力头运动的工作原理。这里以 ly4241 液压控制板为例予以说明(参看 ly4241 液压控制板系统图)。 动力头电动机启动,油泵开始工作。如果动力头在原位,由于停止挡铁的作用,操 相似文献
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Strain-induced martensitic transformation in stainless steels: A three-dimensional phase-field study
A three-dimensional elastoplastic phase-field model is developed to study the microstructure evolution during strain-induced martensitic transformation in stainless steels under different stress states. The model also incorporates linear isotropic strain hardening. The input simulation data is acquired from different sources, such as CALPHAD, ab initio calculations and experimental measurements. The results indicate that certain stress states, namely uniaxial tensile, biaxial compressive and shear strain loadings, lead to single variant formation in the entire grain, whereas others, such as uniaxial compressive, biaxial tensile and triaxial strain loadings, lead to multivariant microstructure formation. The effects of stress states, strain rate as well as temperature on the mechanical behavior of steels are also studied. The material exhibits different yield stresses and hardening behavior under different stress states. The equivalent stress is higher at low strain rate, whereas a higher elongation is obtained at high strain rate. The deformation temperature mainly affects the hardening behavior of the material as well as the transformation, i.e. martensite volume fraction decreases with increasing temperature. Some of the typical characteristics of strain-induced martensite, such as the formation of thin elongated martensite laths, shear band formation and nucleation of martensite in highly plasticized areas, as well as at shear band intersections, are also observed. 相似文献
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圆筒形件冲压模卸料刮口尺寸,传统方法按照"刮口直径等于制件口部内径"原则选取易刮伤制件表面.本文选取制件口部外径作为刮口直径,采用几何关系论证方法,对圆形及椭圆形刮口的有效作用区进行计算.经分析和生产实际验证表明,选用圆形刮口形状,选取刮口口部尺寸等于制件口部外径尺寸,且适当增加滑动间隙,能有效消除制件外表面刮伤. 相似文献
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This paper explores the possibility of using tensile index as one of the appropriate end point parameters to determine the thermal index of a synthetic insulation paper. The paper samples were aged at three different times and temperatures. The tensile index of fresh as well as aged samples was determined experimentally. The study showed that tensile index could be considered as an appropriate parameter to find the thermal index of the chosen synthetic insulation paper. 相似文献
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设计了一种测试物质相变点固、液相导热系数的新方法。该方法用于测试处于低相变温度下的纯物质和湿多孔材料相变时固、液相的导热系数,测试结果与文献数据吻合较好。研究表明该方法用于研究物质相变温度下的热传导以及相界面的热物性是可行的。 相似文献
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A model for the competition of precipitation and recrystallization in deformed austenite 总被引:4,自引:0,他引:4
The hot-deformation of a microalloyed steel sets the stage for the processes of static-recrystallization and strain-induced precipitation. A physically-based model was developed to describe the interaction of these two processes. The precipitates were assumed to form, exclusively, on dislocations. Dynamic effects as well as static recovery were ignored. Given the alloy composition, deformation temperature and dislocation density, the model is able to predict the recrystallized fraction as a function of time. The model may be used to construct recrystallization–time–temperature (RTT) maps as well as deformation–temperature (DT) maps. The predictions of the model are in excellent qualitative agreement with experimental observations. 相似文献
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阐述了钢管测量系统的基本功能和工作流程,按照工位顺序分别介绍了测量系统中称重、测长、喷码、涂色的基本工作原理,依工况进行了以西门子PLC为核心的电气系统设计及西门子PLC的软件流程设计。系统具有自动化程度高、测量精度度、功能强大、操作维护简便等特点。 相似文献
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研究了具有不同金相组织的QT45010铸态球铁所对应的机械性能。研究表明,对QT45010铸态球铁的机械性能影响最大的因素是球铁的石墨形态,并给出了球化级别———机械性能曲线。在一定的条件下,当QT45010铸态球铁的石墨球化级别为1~4级时,其机械性能合格。 相似文献