The invention discloses a device for determining the
punching shape of a
coal seam and a using method thereof. The device comprises a telescopic rod, wherein a hollow rail rod is connected to the telescopic rod, and a
ranging box is nested on the rail rod; the
ranging box is internally provided with a first gear slidably connected with the rail rod, a fixed rod is arranged on the first gear, one end of the fixed rod penetrates into the rail rod, and a first
micro motor is fixed to the end, penetrating into the rail rod, of the fixed rod; an output shaft of the first
micro motor is provided with a second gear, and the rail rod is internally provided with a strip-shaped tooth plate meshing with the second gear; a second
micro motor is fixed into the
ranging box, and an output shaft of the second micro motor is provided with a third gear meshing with the first gear; a limiting rod is fixed to the first gear, and the two ends of the limiting rod abut against the inner walls of the two sides of the ranging box; and a
laser rangefinder is arranged in the ranging box. According to the device for determining the
punching shape of the
coal seam and the using method thereof, the measurementof the
diameter and depth of a cavity-forming hole can be realized effectively and accurately, the form of the hole is restored, and meanwhile, the device is easy to operate, accurate and reliable andhigh in adaptability.