The development trend of coupling in our country

Before the 1980s, there were a few ministerial standards for coupling in the first machinery Department, the textile Department and the second machinery Department of Our country. After 20 years of development, a professional standard system for coupling composed of basic standard, product standard and quality grade standard had been formed by the end of the 20th century. Throughout the development history of coupling standards in China, the level of coupling standards, namely standards and machinery industry standards, is basically divided by time. Before 1989, whether the basic general standard or product standard of coupling, almost all are foreign, between 1989 and 1990 is professional standard (ZB), after 1991, all are machinery industry standard (JB), since 1999, all are recommended standard (JB/T). Bureau of quality and technology supervision abolished professional standard and the standard that should be transformed after cleaning and reciting in 1998, since March 1, 1999, professional standard (code ZB), after cleaning and reciting should be transformed into other standard, stop using by professional standard and standard completely, the standard of new system revision must not quote above standard.

Although the professional standards and standards that need to be transformed in most industries had been transformed by the competent departments of the relevant industries before 1999, the professional standards and standards that need to be transformed in some industries had not been transformed. Therefore, the relevant industry authorities have not yet transformed but still need to continue to use the professional standards, departmental standards and standards were renumbered, that is, transformed into industry standards. The above information is provided by Rongxing Precision Machinery Co., LTD., Rongxing precision Machinery Co., LTD., in addition to the production of coupling also produces a variety of professional expansion sleeve, brake wheel and other products, and product quality is reliable and long service life, over the years to obtain the user's consistent praise.