Tubular low-pressure dryer

The utility model relates to the technical field of drying equipment, and discloses a tubular low-pressure dryer which comprises a drying bin, an arc-shaped cover plate is fixedly connected to the top of the drying bin, an exhaust pipe is fixedly connected to the interior of the drying bin, a motor is fixedly installed on one side of the top of the drying bin, the output end of the motor is fixedly connected with a large gear, and the large gear is fixedly connected with the drying bin. A bearing shell is fixedly mounted on the outer side of the exhaust pipe, a bearing is fixedly mounted in the bearing shell, and a rotating shaft is rotationally connected into the bearing. The exhaust pipe has the following advantages and effects that closing of the bottom of the exhaust pipe is controlled through rotation of the sealing plate, when the sealing plate is opened, sealing of the bottom of the exhaust pipe is relieved, then the exhaust effect is achieved, when the sealing plate is closed, the sealing gasket can e