FA502型细纱机罗拉轴承晃动剖析

所谓晃动,是指细纱机罗拉轴承在罗拉座中运转时,前后靠山不定,即罗拉轴承忽前忽后移动。我们对北京一棉、济南五棉和青岛三棉的FA502型细纱机调查表明,晃动数占调查总数的14％,而对北京一棉、济南五棉和青岛六棉的A513型细纱机调查结果,晃动数为零,可见在FA502型细纱机中,罗拉轴承的晃动是较为普遍的。一、造成晃动的原因罗拉轴承装在罗拉导杆上,因两节罗拉联接后不直,有径向跳动,迫使罗拉轴承在有摇架加压下,在罗拉座内只能作前后移动,即罗拉轴承晃动。此种状况可在罗拉接头处校小弯解     

Rare Earths, Niobium and Tantalum Minerals in Bayan Obo Ore Deposit and Discussion on Their Genesis

Bayan Obo ore deposit is endowed with and lie hidden in the Proterozoic strata. The localities and occurfences of the minerals in the ore deposit were described. It is obviously that some minerals are strata minerals and some are post-strata minerals. The rare earths, niobium and tantalum minerals are exactly the post-strata minerals. In these minerals the hydrothermal metasomatic phenomena distinctly reveal their metallogenic characteristics. According to tectonic movement, magma activity, mineral paragenesis, hydrothermal metasomatism, geological age and lasting time-scale of metallogenesis, and some other factors, it is supposed that genesis of rare-earths, niobium and tantalum minerals in Bayan Obo ore deposit are closely related with hydrothermal metallogenic solution which is differentiated from silica acid and carbonic acid magma and derived from deep seated source, and then intruded into Proterozoic strata and metasomatized. It is recognized that the metallogenesis of Bayan Obo ore deposit is undergoing a long geological period and many episodes.     

A513型细纱机几项可供自行改造的设计

A513型及其派生型式细纱机,自1975年投产供棉纺厂使用以来,已出厂11400多台,随着大面积用户使用经验和机械制造厂研究成果的积累,至1983年年底出厂的产品已有了较大的改进,仅细纱机设计方面就80多项,这里推荐可供使用厂自行改造的几项设计,供早期出厂的细纱机使用厂自行改造,求得与1983年底出厂细纱机一样完善。 1.油箱龙筋因渗油或个别锭子飞油造成整节油箱缺油与耗油量较有脚锭子为大。可以改     

我国铌钽稀土矿物学及工业利用

该文对我国铌钽稀土矿床及其产出的矿物进行了论述。根据从铌钽稀土元素的地球化学性质，认为地球物质分异是元素地球化学的原始动力。矿物学的核心内容之一是矿物的晶体结构和晶体化学，而铌钽稀土矿物晶体化学问题更占重要位置。在铌钽稀土矿物晶体结构中，铌钽是在假想酸根中呈中等大小的阳离子，而稀土则为阳离子配位多面体中的大阳离子形式存在，以此决定了它们的晶体化学行为。列出了我国产出的铌钽稀土矿物种类和各类各族中的种数，并简要论述了它们的主要矿物学特征。综述了我国铌钽稀土矿床的成矿地质时代和矿床成因类型，并列出各类型矿床中的众多不同产地，以表明矿床类型的多样性和矿化地区的广泛性。还对我国利用这类矿物的特色和可持续发展做出了建议。