Welding gun replacing mechanism convenient for manipulator to grab and release welding gun

The utility model provides a welding gun replacing mechanism convenient for a manipulator to grab and release a welding gun. The welding machine comprises a rack, two welding guns are installed on different installation blocks through connecting blocks respectively, a mechanical arm moves the current welding gun to the rack, the connecting block of the current welding gun is connected with the corresponding installation block on the rack, and the mechanical arm loosens an installation disc on the current welding gun so that the welding gun can be placed on the rack. The currently vacant mechanical arm is inserted into the gun grabbing hole in the gun replacing disc of the other welding gun, the mechanical arm grabs the welding gun through the gun grabbing hole and is communicated with thewelding gun through the gun replacing disc of the welding gun, the gun replacing operation of the welding gun is achieved, and the previous welding gun is stably placed on the machine frame. Accordingto the utility model, the