Simple tool for pneumatically cutting circular hole

The utility model discloses a simple tool for a gas cutting circular hole, which relates to a simple tool for cutting a large circular hole on sheet material by gas cutting. The mechanism is composed of a positioning hammer, a screw bolt, a guide bar, a fixing ferrule, a cutting torch bar, and a gas cutting nozzle; the positioning hammer is connected with the guide bar through the screw bolt; the gas cutting nozzle is connected with the cutting torch bar; the cutting torch bar is connected with the guide bar through the fixing ferrule; the upper half part of the positioning hammer is provided with a through hole through which the positioning hammer can slide on the guide bar back and forth. The utility model has the advantages of simple structure and reasonable design.