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我国用于露天采矿的KQ型(YQ型)潜孔钻机的钻具由钻杆及冲击器等组成,其回转扭矩靠回转接头传递。回转接头前端的两个导向键,不仅起着与钻杆联接的功能,而且又是回转扭矩的主要承受者。在作业中,因岩石硬度、钻孔条件不同,该键所承受的扭力及剪切载荷也相应产生变化,尤其是当扩孔及处理卡钻头、卡钻杆等事故时,该键所承受的交变扭矩及剪切载荷会急剧增加,在此工况下,工作的回转接头极易使两个导向键磨损或者断裂。原设计该接头为一整体零件,以往在修理
China’s open-pit mining KQ (YQ-type) DTH drilling rig by the drill pipe and the impactor and other components, the rotary torque by the rotary joint delivery. The two guide keys on the front of the swivel do not only function as a link to the drill pipe but are also the mainstay of slew torque. In operation, due to the rock hardness, drilling conditions are different, the key to bear the torsional and shear loads corresponding changes, especially when the reaming and processing card drill, stuck pipe and other accidents, the key bear Alternating torque and shearing load increase dramatically, and in this condition, the working swivel joints can easily wear or rupture the two guide keys. The original design of the connector as a whole, in the past to repair