我们使用的钻夹具由于经常变换钻模板,使回转夹具体(附图),上紧固钻模板的六个内螺纹孔直径增大不能使用。为此,我们采用膨胀螺栓补 The drill jig we used can not be used due to the frequent change of the drilling template so that the diameter of the rotary clamp body (figure) and the six internally threaded holes of the tightening template can not be used. To this end, we use expansion bolt make up