Secondary lubricating device for crust breaking cylinder of aluminum electrolysis cell

The utility model relates to the technical field of industrial lubrication, in particular to a secondary lubrication device for a crust breaking cylinder of an aluminum electrolysis cell, which comprises an inflow pipe and a return pipe, the front end of the return pipe is connected with the tail end of the inflow pipe, the tail end of the return pipe is bent towards the inflow pipe, and a connecting pipe extends from the tail end of the return pipe. A plurality of branch pipes are arranged on the connecting pipe and the flow inlet pipe, the branch pipes are connected with the air cylinder for lubrication, an atomized lubricator I is arranged at the front end of the flow inlet pipe, an atomized lubricator II is arranged at the tail end of the flow return pipe, compressed air is introduced into the inlet end of the flow inlet pipe, and the ball valve I and the ball valve II are always opened and closed relatively, so that two variable passages can be realized; the lubricating device is simple in structure, con