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在金刚石绳索取心钻进中，常发生钻杆折断事故。一旦钻杆断口不齐，发生劈裂或磨成喇叭状，下公锥难以攻丝，同时容易将断头部断续撑裂，使事故变得复杂。由于使用的钻杆与孔壁间隙甚小不能下母锥处理，我们研制了这种螺杆打捞器。一、结构与使用方法螺杆打捞器是由螺杆（1）、滑动垫（2）、上锥套（3）、涨筒（4）、下锥套（5）、防转管（6）等组成，如图所示。在绳索取心钻进中，当使用的φ56内外平钻杆发生折断时，用φ42钻杆连接螺杆打捞器下入孔内，通过断头进入φ56钻杆内。螺杆打捞器下部的防转管
In the diamond rope coring drilling, drill rod breakage often occurs. Once the drill pipe rupture, splitting or grinding into a trumpet-like, under the male cone difficult to tapping, at the same time easy to break the head intermittent fracture, the accident becomes complicated. Due to the use of the drill pipe and the hole wall gap can not be under the mother cone processing, we developed this screw salvage. I. Structure and Usage Screw salvage device consists of screw (1), sliding pad (2), upper taper sleeve (3), up tube (4), lower taper sleeve (5), anti-rotation tube ,as the picture shows. Coring in the rope drilling, when the use of φ56 inside and outside the flat drill rod fracture occurs, with φ42 drill pipe connected to the screw under the fishing under the hole, through the decapitation into the φ56 drill pipe. Anti-rotation tube in the lower part of the screw