Rail-mounted inspection robot

The utility model discloses a rail type inspection robot. Box body, an I-shaped mounting strip is arranged above the box body; guide strips are arranged on the upper surface and the lower surface in the I-shaped mounting strip; second rollers are arranged in the middles of the front side and the rear side of the I-shaped mounting strip; the outer side face of the second roller makes contact with the guide bar. Positioning shafts are respectively arranged on the front and rear surfaces of the second roller; a third motor is arranged on the upper surface of the box body; belt pulleys are arranged at the end part of an output shaft of the third motor and the end part of the positioning shaft; two fixing rods corresponding front and back are arranged on the upper surface of the box body; one end of the positioning shaft penetrates through the belt pulley and is connected with the fixed rod through a bearing seat; the first motor can drive a fourth gear to rotate, the fourth gear can drivea third gear to rotate, t