针对煤矿用钻杆连接螺纹体在正紧密距状态下,使用过程中螺纹体发生塑性变形而粘扣,导致频繁出现难于拆卸的问题,从理论上分析了钻杆连接螺纹体在不同紧密距下的受力情况和转矩情况,指出螺纹体紧密距是煤矿用钻杆圆锥螺纹无法拆卸的最大影响因素。 Aiming at the problem that the threaded body of the connecting rod body of a coalmine drill pipe is in close contact with each other in a tight close state, the threaded body is plastically deformed and fastened during use, which leads to the problem that the screw body is difficult to be disassembled frequently. The results show that the close distance of the threaded body is the biggest factor that can not be disassembled by the taper thread of drill pipe.