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在设备安装和维修过程中,两轴的找正是经常遇到的,在设备安装及运行过程中难免出现两轴间的径向位移和轴向倾斜等偏差。如果这种位移和倾斜超出技术规定允许范围,将使两轴及轴上相关零部件产生附加交变轴向和径向力,造成震动、摩擦生热,减少联轴器的使用寿命,严重时则导致轴断、齿轮点蚀。联轴器在加工和装配上有相应的技术要求,它比较直观地、以最大程度反映两轴的位移和倾斜。所以调整联轴器的同轴度实质就是调整两轴的同轴度。联轴器在安装或运行过程中将会出现以下三种情况:①两轴既平行又同心。②两轮平行但不同心。③两轴既不… 相似文献
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一种改进的胶原蛋白湿肠衣喷头 (942 492 2 8,2 2 10 5 36 )该喷头的特征是在原有喷头的芯轴上作出改进 ,除前端保留一光滑圆段外 ,在芯轴上设有变径螺纹 ,在芯轴后端还连接一根带转动轮的转轴。使用时 ,通过外接的电机和减速机构带动转动轮转动 ,使芯轴随之转动 ,像一个螺旋推进器一样对胶原蛋白进一步施加挤出压力 ,提高了肠衣的微密度 ,减少了现有喷头因挤出压力不足而容易破裂和不均匀的现象 ,改善了肠衣质量。双螺旋自熟挤压机 (942 45 2 35 ,2 2 39712 )由机架、电动机、双轴动力输出分配器、双联联轴器、多节式挤压腔及其内的双螺旋… 相似文献
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《纺织机械》1985年第6期刊载的《A-076C型成卷机的几项改进》一文中介绍了万向联轴器的改进。我厂A076C型成卷机传动铁炮轴的一套球形万向联轴器在使用中也存在类似问题,即握持点容易磨损,磨损后边轴有异响,振动明显增加,严重时造成斜齿轮座的短轴从根部折断。造成停台,影响生产。我们于1986年1月参考该文经验作了改进,不同之处是: 1.不用A456型粗纱机用的万向联轴器, 相似文献
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目前,各浸出油厂中用来连接蒸脱机电机输出轴与减速器输人轴的联轴器,多采用弹性图联轴器,但是由于安装和基础下沉等因素影响,使被连接的电机输出轴与减速器输人轴难以精确对中,两轴间相对位置发生变化,产生径向位移,引起电机与减速器振动,导致电机轴和减速器输人轴磨损,弹性胶圈经常损坏,不得不频繁的装拆更换大量的胶圈,造成一定的经济损失和浪费,并巨更换时要被迫停车,影响正常生产。我们通过实地考察,分析研究,采用了软连接联轴器,已使用二年多了,效果很好,装拆方便,降低了蒸脱机传动的事故率。另外,这种联轴器我厂… 相似文献
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<正> 连续拉丝机一般都采用立式电机直接拖动,电机轴与拉丝机输入轴之间用齿轮联轴器联接。此类联轴器需注入润滑油(脂),由于转速快,油脂易流失,造成干摩擦而影响使用寿命,内齿轮又难于加工,因此,维修工作量大,成本高。我厂自1984年开始对其进行了改造,采用尼龙柱销联轴器,经几年来的使用证明, 相似文献
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FA70 2型并纱机断纱自停装置的自停转子轴之间通过联轴器进行连接 ,我公司在使用过程中发现联轴器两端的螺钉经常松动 ,导致联轴器产生轴向窜动 ,并且自停转子轴轴头搭接处由于磨损产生间隙 ,使该锭纱线断头后 ,自停失效 ,发生“跑单根”现象 ,影响产品质量。再者 ,经常紧固联轴器螺钉易造成螺纹损坏 ,使维修任务加重。针对这一问题 ,我们经过认真分析 ,设计了新的联轴器 (见图 1 ) ,将联轴器内孔改成等直径孔 ,具体制作方法为 :先用 45# 钢材加工出外径 34mm、内径 2 0mm、长度 1 40mm的联轴器主体 ,然后在主体外表面圆周三等分处… 相似文献
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摘 十字滑块联轴器的主要失效形式是榫或凹槽面压溃变形,其传递力或力矩的接触面变形后,产生冲击、振动,无法保证联轴器的正常工作,需要整体更换。针对十字滑块联轴器存在的问题,提出了双半联轴器的改进方案。实践证明,经改进的十字滑块联轴器其寿命延长近1倍,而且大大减少了维修工作量。 相似文献
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Human hepatic cancer cells, HepG2, formed spheroids on a poly-L-glutamic acid-coated dish. Doxorubicin (DOX) efflux activity of the cells in spheroid culture was higher than that in monolayer culture due to the higher expression of MDR1 protein of the cells in spheroids compared with those in monolayer. The amount of MDR1 per cell in spheroids was similar to that of hepatic tumor tissue in vivo. Consequently, it was suggested that the drug efflux activity of cells in spheroid culture reflected the activity of hepatic cancer cells. Furthermore, the IC(50) of DOX and epirubicin (EPI) in HepG2 cells, both of which are known to be exported by MDR1, were higher in spheroid compared with monolayer cells, while IC(50) of 5-fluorouracil (5-FU), which is not exported by MDR1 protein, was almost the same in both types of culture. The higher IC(50) of DOX and EPI in HepG2 cells in spheroid culture was associated with a higher efflux activity of the drugs in the spheroid-cultured cells, which appeared to reflect the IC(50) of DOX and EPI in cancer cells in vivo. Therefore, a spheroid culture of hepatic cancer cells seems to provide a promising cell-based in vitro assay system for examining the proper IC(50) values of anticancer agents that would reflect the drug resistance of cancer cells in vivo. In addition, the system would be useful in screening for inhibitors of MDR1 activity, which will help to overcome the multidrug resistance of cancer cells. 相似文献
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青豆近似为球状,采用完全隐式差分法,建立描述近似青豆的球状食品冻结过程传热特性的偏微分方程:通过数值计算获得青豆冻结时间的数值解,并与实验值比较。结果表明:数值法计算结果与实测值吻合较好,具有较高的精度。 相似文献
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数字存储示波器的远程控制方法 总被引:1,自引:0,他引:1
以TDS6604B数字存储示波器为对象,选用GPIB—LAN适配器AD007,构成远程控制系统.采用VC 6.0编程语言为软件开发工具,在辅助软件TekVISA和动态链接库tktds6k_32.dll基础上,通过网络对示波器进行远程控制,获取相关参数的当前值,根据需要设置参数,对获得的信号波形自动测量,取得相关数据,采集测量结果并存入数据库.实验结果表明,该方法方便有效,适用于科学实验和工程项目. 相似文献
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A liquid diffusion model for thin-layer drying of rough rice 总被引:1,自引:0,他引:1
Oktay Hacihafizoğlu Ahmet Cihan Kamil Kahveci Antonio G. B. de Lima 《European Food Research and Technology》2008,226(4):787-793
In this study, the drying behavior of single-layer rough rice with a moisture content of between 22 and 24% on the dry basis
was simulated by means of a liquid diffusion model, based on a prolate spheroid geometry. For this purpose, the solution of
liquid diffusion equation was fitted to the experimental moisture ratios for drying air temperatures between 40 and 60 °C
and velocity 1.5 m s−1. In order to make a comparison, the predictions of liquid diffusion equations for a spherical and finite cylindrical geometry
were also fitted to the experimental results. Modeling was performed by selecting the diffusion coefficients in diffusion
equations in such a manner as to minimize the sum of the squared differences between the experimental results and the theoretical
predictions. It was found that the liquid diffusion model, based on a prolate spheroid geometry, explains single-layer drying
behavior of rough rice well. It was also found that the model, based on a prolate spheroid geometry, has better agreement
with the experimental results than the other geometries. 相似文献
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轴类零件计算机辅助数控编程系统的设计 总被引:1,自引:0,他引:1
零件数控加工程序的编制是零件数控加工工序的重要组成部分.计算机自动编程技术是提高零件数控编程效率的关键.针对轴类零件设计的计算机辅助数控编程系统具有零件信息输入、图形显示、工艺参数输入、加工模拟、数控程序生成、形成工艺信息数据库、打印输出等功能.利用该系统可显著提高轴类零件的数控编程效率. 相似文献