正确使用好小口径岩心钻具,是卖现金刚石钻进优质高产的重要措施之一。双层单动岩心钻具(简称单动双管)是当前小口径金刚石钻进中普遍使用的一种钻具,按单动结构形式,归纳起来有以下五种:即单盘压力轴承式,双盘压力轴承式,钢球 Correct use of small diameter core drilling tools is one of the important measures to sell high quality and high yield diamond drilling. Double-acting single-action core drill (referred to as single-action double-pipe) is commonly used in the current small-diameter diamond drilling a drill, according to the single-action structure, summed up the following five: single-disc pressure bearing, Double-disc pressure bearing, steel ball