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介绍了新国标GB25974.1的特点,即更加强调液压支架的安全措施和安全性能。通过与旧标准MT312对比分析可知,二者差异性主要体现在:增加了循环复合加载项目对支架进行综合性能测试,为原来次数的2～3倍;增加了让缩性能试验项目,着重考核液压支架承受顶板下沉的能力;增加了水平加载和多项集中载荷试验项目等强度试验项目。这些变化和改进对液压支架的结构强度、耐久性能和安全性能等方面提出了更高要求。新标准基本上与国际标准接轨,该标准的颁布使我国的液压支架标准体系更加完善,对于提高我国液压支架的设计、制造和试验水平将发挥重要作用。
Introduced the new national standard GB25974.1 features, that is, more emphasis on hydraulic support safety measures and safety performance. Through the comparison with the old standard MT312, we can see that the difference between the two is mainly reflected in the following: increased cyclic composite loading project carries out the comprehensive performance test on the bracket, which is 2 to 3 times of the original number; increased shrinkage test project, Bracket withstand the ability to sink the roof; increase the level of load and a number of concentrated load test project intensity test project. These changes and improvements put forward higher requirements on the structural strength, durability and safety performance of the hydraulic support. The new standard is basically in line with international standards. The promulgation of the standard will make the standard system of hydraulic support in our country more perfect and will play an important role in improving the design, manufacture and test of hydraulic support in our country.