Head-on blast hole accurate calibration device for coal mine semi-circular arch section roadway

The utility model relates to an accurate calibration device for a head-on blast hole of a semi-circular arch section roadway of a coal mine. The shot hole panel is a quarter arc shot hole panel; a rotating shaft outer pipe is arranged on one side edge of the shot hole panel and arranged on the outer side of the fixing shaft in a sleeving mode, the length of the fixing shaft is slightly larger thanthat of the rotating shaft outer pipe, a top fixing device is arranged at the upper end of the fixing shaft, a bottom fixing device is arranged at the lower end of the fixing shaft, and a plurality of shot hole positioning holes are distributed in the shot hole panel. The accurate calibration device for the head-on blastholes of the semi-circular arch section roadway of the coal mine has the advantages that the positions of the blastholes can be accurately positioned according to a theoretical blasthole arrangement diagram in operation regulations, and therefore an ideal forming effect is achieved; 2, investment is l