JJF1553-2015《摆锤式撕裂度仪校准规范》经国家质检总局2015年12月7日批准,并自2016年3月7日起实施。一、制定背景摆锤式撕裂度仪广泛用于轻工、纺织、化工、建材及交通、水利等行业。尽管撕裂度仪有行业检定规程JJG（轻工）63-2000《撕裂度测定仪检定规程》、行业校准规范JJF（纺织）049-2012《摆锤式织物撕裂仪校准规范》,但由于各规范技术要求、

自动保压重锤式液控蝶阀在大型泵站广泛地使用,该阀采用液压系统来实现两个阶段的关闭;采用PLC电气控制可与泵联动,能实现远方控制及通过上位机集中控制等功能。从不同控制系统联系纽带这个切入点着手系统分析液控阀故障类型,对于其他有多种控制系统组成的产品分析故障也有一定借鉴的作用。

The paper presents the design and preliminary test results of a corer used for hard seafloor sediments sampling.Generally the sediment cores are provided by either gravity-type coring or deep-ocean drilling for a range of studies.However,in consideration of the operability and available sample length in collecting hard sediments,these methods exhibit no advantages.In this paper,a new corer which can exploit both hydrostatic energy and gravity energy for hard sediments coring is presented.The hydrostatic energy is provided by pressure differential between ambient seawater pressure and air pressure in an empty cavity.During sampling process,the corer penetrates into the sediment like a gravity corer and then automatically shifts to the percussion mode.The experiments in the laboratory indicate that the corer can complete 40 cycles in the sea with a cycle time of 2.8 seconds in percussion mode and impact the sample tube with the velocity of 0.2 m/s during each cycle.Besides,its adjustab...