Rotary cathode device for submerged-arc welder

The utility model relates to a rotary cathode device of a submerged arc welding machine. The rotary cathode device of a submerged arc welding machine comprises an electrode gripping holder, an electrode conductive device and an earthing device. The utility model is characterized in that a base (3) of the electrode conductive device is provided with a sleeve and is connected with a bracket (4), the left and the right of the bracket is provided with shaft housings and the bracket is connected with an outside frame (5), an inside and the outside frames are connected through a match of two opposite projecting blocks (11) and a concave slot (12), a conductive sleeve is matched with an electrode shaft (8) of the electrode gripping holder, and a lead earthing device is led out from an earthing plate. The utility model adopts the conductive sleeve for contacting with the cylinder of the electrode shaft and a universal rotary contact structure, removing the poor contact phenomena caused by workpieces installation disalignment; and has big contact area, good contact performance and long service life.