Frock of holing on protection casing

The utility model discloses a frock of holing on protection casing, the drilling frock is fixed on the workstation of drilling machine, and it is fixed with the workstation that the bolt is passed through at four angles of base, and the vertical welding has a locating plate on the central line of base, is fixed with a circular convex block at the intermediate position of locating plate, the last processing at least of circular convex block has three annular table rank, the diameter on annular table rank diminishes the center gradually to be reserved and has the shaft hole, and being equipped with the lead screw in the shaft hole, to pass through the nut fixed, processing has the shop bolt hole around the circular convex block, and the supporting has been welded at the back of locating plate. The shape of base is square or rectangle, the locating plate is the steel sheet of a square. The one end and the base welding of supporting, the other end constitutes a back with the locating platewelding. This technical