Ventilation pipeline structure

The utility model discloses a ventilating duct structure, which belongs to the field of paint spray booth ventilation and comprises a ventilating duct main body, an air outlet pipe is arranged at the bottom end of the ventilating duct main body, one end of the air outlet pipe is fixedly welded with the outer wall of the ventilating duct main body, and the inside of the air outlet pipe is communicated with the inside of the ventilating duct main body. One end of the air outlet pipe is connected with a fixed gland through a rotating shaft, the fixed gland blocks an opening of the air outlet pipe, vent holes are evenly formed in the surface of the fixed gland, an air filter element is placed and installed in the fixed gland, a pair of inserting grooves is formed in one side of the fixed gland, and limiting rods are inserted and installed in the pair of inserting grooves. A pull block is fixedly installed at one end of a limiting rod, a limiting spring is installed on the outer side of the limiting rod in a sleev