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三環鏈
      

安全系數只有φ24.6以上三環鏈的極限荷重能提煤車6部或4部矸車，方能達到《煤礦安全規程》第414條的規定不小于10；φ24.6（含φ24.6）以下的其它安全系數未能達到《煤礦安全規程》第414條的規定不小于10 ，須更換不合格的三環鏈。
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