韶峰D系列黑白机(35—3型)疑难故障检修两例

例1.水平一亮线分析与检修:查OTL中点电压为0.78V,推动管4BG_1基极集电极电压分别为0.78V和0.82V,断开4BG_2、4BG_3基极,再测V_(b1).V_(c1)仍不变,说明4BG_1已饱和。断开4BG_1基极,给D7609⑧脚供7.2V电压(用10kΩ电位器接在 12V与地之间调节电位器得之)测⑦脚电压为5.3V,查⑾脚电压12V正常、在路测4R_5、4R_7、4W_1、4R_6正常。换D7609试之故障依旧,偶尔振动底板亮线能闪开几秒钟后又成为一水平亮线,干脆拆下4W_1发现安装4W_1底板上有很厚一层灰尘,用刷清除,再焊上开机光栅拉满,恢复正常。     

大型发电机定子线圈对地绝缘的快速修复

为使大型发电机绝缘故障能短时间内完成修复,利用传统桐马环氧多胶云母带等材料开发了定子线圈对地绝缘快速修复技术。采用该技术修复了某进口350 MW发电机定子线圈对地绝缘故障,修复后的线圈顺利通过电气试验并安全运行超过2年。     

理解万岁——一位党委书记的心声

我是南通东纺纺织有限责任公司的党委书记。自86年调进县纺织厂专职从事政治工作以来,作了一些微不足道的探索。深深地悟出一个道理:理解是相互的、共同的,若要得到别人的理解,首先必须理解别人。理解是搞好企业的启动器。理解万岁！ 在纺织厂11年中,我曾先后与4位厂长共过事,撑过顺风船,也掌过顶风舵,无论是在顺境中,还     

热固型干膜润滑剂

工程机械农业机械等的工作条件一般都是比较差的由于普通润滑剂(指机油、润滑脂及其他润滑油)粘度大,在工作过程中极易吸收灰尘与石屑,更影响了这些机械的使用寿命。没脂粘灰后,难于清洗,使润滑剂层变后,油脂与尘上混合后,变成了“粘质研磨膏”,结果使传动部分磨损加剧,很快就会丧失精度,并使机器传动阻力加大,增加能耗。对于某些难于加油的地方,可能因断油而加快磨损或生锈腐蚀。这些情况,用一般的方法是较难解决的。     

PREPARATION OF ETHYLENE GLYCOL ACETATE THROUGH CATALYTIC OXIDATION OF ETHYLENE——ONE-STEP PROCESS WITH SIMULTANEOUS INTRODUCTION OF OXYGEN AND ETHYLENE INTO A Pd-Cu CATALYTIC SOLUTION

Ethylene glycol acetate can be prepared from ethylene by employing PdCl_2-CuCl_2-Cu(OAc)_2 in anacetic acid solution,usually involves two steps-acetoxylation and the regeneration of catalyst.In thispaper,a one-step process has been studied with oxygen and ethylene introduced simultaneously in a singlereactor.It was observed that there must be enough partial pressure of oxygen to oxidize Cu~+ to Cu~(2+)by keeping oxygen content at 8-10% in the raw binary gas mixture of oxygen and ethylene,whereby theactivity of the catalytic system could be maintained without formaton of CuCl residue.By using nitrogen as a diluent,the ratio of O_2/C_2H_2 could be kept in the non-explosive range.Itis claimed that 95% of the converted ethylene from the feed gas exists as ethylene glycol monoacetateand diacetate.     

Kalman filter of the force signal of identifying weld seam in remote teaching

For reasons of the vibration of robot, the rough surface of weld seam and electromagnetic disturbance of welding machine, the force signals of identifying weld seam become unstable. The position error of remote teaching point is too big to meet teaching requirements in remote welding. The force signals of identifying weld seam can be filtered by Kalman. The force signals of identifying weld seam of next teaching point is accurately predicted according to predicting algorithms, such as the equation of the state, the equation of the observation, the gain matrix of the filter and the covariance matrix of predicting state. The experimental results show that the precision of identifying weld seam is improved by Kalman filter.     

新型耐火度试验炉的应用

介绍了一种新型的耐火度试验炉。新型耐火度试验炉通过工业Pc及全自动控制,加热系统采用新型发热体以及摄像系统的引入,实现了耐火度检测的全程监控。实际应用表明,新型耐火度试验炉与碳粒炉相比节能降耗,控温精度高,提高了检测的自动化程度,使结果更加准确。     

热风炉蓄热室格子砖物理性能检测方法研究

详细叙述了蓄热室格子砖的检测方法,利用浸液称量的方法测量蓄热室格子砖的密度,进而推导出试样的受力面积,为其他物理性能指标的检测提供方便,为提高产品质量提供可靠依据。