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1957年鞍山钢铁公司积极研究和推广微差爆破法,由于缺少适合于我国矿山技术条件的微差爆破仪器,只得用中间继电器来代替,但因为它的准确性差,连续发生了拒爆事故,阻碍了这一先进经验的试验和推广。鉴于这种情形鞍山钢铁公司安全技术监察处劳动保护研究室设计并试制出来了57—型微差爆破仪器,它适用于矿山开采,厂房和生产设备附近爆破基础等。
In 1957, Anshan Iron and Steel Company actively researched and popularized the method of micro-difference blasting. Due to the lack of the micro-blasting instrument suitable for the technical conditions of mine in our country, only the intermediate relay has to be replaced. However, because of its poor accuracy, The trial and promotion of this advanced experience. In view of this situation, Anshan Iron and Steel Company Safety and Technical Supervision Labor Protection Laboratory designed and trial-produced a 57-type micro-blasting instrument, which is suitable for mining, plant and production equipment near the blasting foundation.