Non-contact cathode pressure-drop measuring drill rod

The utility model provides a non-contact cathode pressure-drop measuring drill rod of an aluminum electrolysis bath. The utility model adopts the technical scheme that the lower end of the iron drill rod is covered with a layer of protective film; the iron drill rod is interposed into the aluminum electrolysis bath and extends into the aluminum liquid without being inserted into the cathode during measurement; and the iron drill rod is in contact with the furnace bottom and then is lifted for 2cm. The utility model has the advantages that the measuring drill rod is prevented from being directly inserted into the cathode, thereby protecting the cathode; the drill rod needs not to be inserted into the cathode, thereby enlarging the covering surface of the tip of the drill rod; and the measuring data of a point are converted into the measuring data of a range, so that the data are more convincing and reliable. The drill rod needs not to be inserted into the cathode, therefore, the operation is simpler, the opera