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为了改善矿井通风条件，浙江建德铜矿从1989年开始进行矿井通风系统改造，成功地将原单翼对角抽出式通风系统改造成两翼对角抽出式通风系统，北翼和西翼分别选用K4OA-NO11和K4OA-NO14型节能风机作主扇。改造后的矿井通风系统使10项通风系统鉴定指标全面得到改进，有效风量大大
In order to improve mine ventilation conditions, the mine of Jiande copper mine in Zhejiang Province started to reform the ventilation system of the mine from 1989 and succeeded in transforming the original single-wing diagonal pull-out ventilation system into a two-wing diagonal pull-out ventilation system with K4OA -NO11 and K4OA-NO14 energy-saving fan as the main fan. After the transformation of the mine ventilation system so that 10 ventilation system identification indicators have been fully improved, effective large air volume