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在井下和露天矿采矿中,用旋转冲击式大型钻头钻深孔,就要使用由钻头、钻杆,供钻杆互相连接的有内螺纹的接杆套和接杆钎尾组成的钻(钎)具系统。螺纹连接应保证组装和拆卸钻具系统时易于拧入和拧出钻杆,钻杆端部之间保持同心,紧密接触,以便以最小的损耗把冲击能从活塞通过接杆钎尾和钻杆传递到钻头的切岩元件上。R型和K型(波形和梯形)螺纹(图1)在连接钻杆中应用最广。R型螺纹螺距为12.7mm,啮合角等于20°,螺纹槽底部呈圆弧形。螺纹中通过冲击脉冲时,在它们中形成不太大
In underground and opencast mining, drilling large holes with a rotary impact large drill bit requires the use of a drill consisting of a drill bit, a drill pipe, an internally threaded nipple and a shank for the connection of the drill pipe With system. Threaded connections shall ensure easy insertion and removal of the drill pipe during assembly and disassembly of the drill system with concentric and close contact between the ends of the drill pipe to minimize the impact of impact energy from the piston through the rod shank and drill pipe Sent to the rock cutting rock components. R-type and K-type (wave and trapezoidal) threads (Figure 1) are the most widely used in connecting drill rods. R-type thread pitch 12.7mm, meshing angle is equal to 20 °, the bottom of the thread groove was circular arc. Thread through the shock pulse, formed in them is not too large