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煤炭部科技局于1982年2月17日～20日在张家口煤机厂召开的审定会上通过。今后研究和制造液压支架所采用的双伸缩立柱一律采用本系列。鉴于进口液压支架中缸径为220毫米的双伸缩立柱占有一定比例,这一规格的立柱还需继续生产一批,以补充备用。对于己投产的仿制液压支架,缸径己选为220
Ministry of Science and Technology Bureau of Coal in February 17, 1982 to 20 at Zhangjiakou Coal Machine Factory held the validation meeting. The future research and manufacture of hydraulic scaffold double telescopic columns are used in this series. In view of the import of hydraulic support bore diameter of 220 mm double telescopic columns occupy a certain percentage of the specifications of the column still need to continue to produce a batch to supplement spare. For the production of imitation hydraulic stent, cylinder diameter has been selected as 220