The development trend of coupling in our country
Time: 2011-03-20 17:56 Author: XINLAN Coupling Click:次
The development trend of coupling in our country
Before the 20s, my country's original Ministry of Machinery, Textiles, and Second Machinery had a few ministerial levels.CouplingStandards, after 20 years of development, by the end of the 20th century, a professional coupling standard system composed of basic standards, product standards, and quality grading standards has been formed.Throughout the history of the development of coupling standards in my country, the level of coupling standards, that is, national standards and machinery industry standards, is basically divided by time. Before 1989, the basic universal standards or product standards for couplings were almost all international. From 1989 to 1990, they were professional standards (ZB). After 1991, they were all mechanical industry standards (JB). Since 1999 All are recommended standards (JB/T). In 1998, the National Bureau of Quality and Technical Supervision abolished the professional standards and the national standards that should be transformed after the cleanup and rectification. From March 1999, 3, the professional standards (code ZB) should be converted into other standards after the cleanup and rectification, and all professional standards should be stopped. When used with national standards, the newly formulated and revised standards must not quote the above standards.
Although the professional standards and national standards that need to be transformed in most industries have been transformed before 1999, the professional standards and national standards that need to be transformed have not been transformed in some industries.Therefore, the relevant industry authorities have renumbered the professional standards, ministry standards and national standards that have not yet been transformed but still need to be used, that is, transformed into industry standards.The above information is provided by Joy Precision Machinery Co., Ltd. In addition to the production of couplings, Joy Precision Machinery Co., Ltd. also produces a variety of high-quality expansion sleeves, brake wheels and other products, and the product quality is reliable and has a long service life. The user's unanimous praise.
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