Exhaust apparatus that extraction tank was used

The utility model relates to a metallurgical chemical industry auxiliary assembly technical field provides an exhaust apparatus that extraction tank was used, including extraction tank, air exhauster and female pipe, wherein female pipe is connected to the air exhauster, and is provided with the suction pipe who extends to in the extraction tank on female pipe, being provided with the air door in the suction pipe, and radial the interlude having the activity pivot on the air door, activity pivot both ends clamp on suction pipe, suction pipe includes branch pipe and the overcoat lower branch pipe on last branch pipe bottom, and wherein the air door is installed at the bottom suspension intraductally, and lies in and all is provided with the arc on the intraductal lateral wall of bottom suspension of activity pivot both sides, and the wherein arc in two arcs lies in the top of air door, and another arc lies in the air door bottom, and the activity pivot lies in between two arcs, bottom suspension socle end spir