Split type fractionating tower for rapidly preparing oxygen and nitrogen

The split type fractionating tower comprises a fractionating tower body and a bottom plate, the bottom plate is arranged below the fractionating tower body, a support is welded to the top face of the bottom plate, the fractionating tower body is arranged on the inner wall of the support, and a liquid inlet pipe and an air inlet pipe are arranged at the lower end and the upper end of the surface of one side of the fractionating tower body respectively. A nitrogen exhaust pipe is arranged on one side of the top surface of the fractionating tower, an oxygen exhaust pipe is fixedly mounted on the bottom surface of the fractionating tower, an overflow pipe is vertically arranged in the fractionating tower, and overflow holes are formed in the surface of the overflow pipe. According to the overflow pipe cleaning device, a worker starts the electric push rod to work through the control panel, the telescopic end of the electric push rod drives the movable rod to move up and down in the overflow pipe, the cleaning bru