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一、构造:见总装配图,分上下两部分。下部只有一个方圆形内孔卡套1,卡套1上端有与空心轴相同规格的右方扣,靠力圆形内孔的作用,代动钻杆转动。
First, the structure: see the general assembly drawing, divided into two parts. The lower part has only one square circular inner hole ferrule 1. The upper end of the ferrule 1 has the right side buckle of the same specification as the hollow shaft and relies on the action of the circular inner hole to rotate the drill pipe.