The invention discloses a spiral material mixing pneumatic dryer. The spiral material mixing pneumatic dryer is characterized by comprising a magnetic coupler, a vacuumizing and
nitrogen air outlet, a seal device, an upper cylinder, a screen net, a sampling device, a spiral hollow shaft, a middle cylinder, a
pressure sensor, a bottom frame, a lower cylinder, a conical discharging plate, a flower-shaped supporting plate, an air cylinder, a discharging conical cylinder, a discharging cylinder, a spiral conveyor, a feeding opening, a hot
nitrogen inlet and an
air bearing; the magnetic coupler comprises a first
magnet, a partition plate and a second
magnet; according to the dryer, the manner that three methods of
vacuum drying, hot
air convection drying and
thermal radiation conduction
drying are combined is adopted to
dry powder; under the stirring effect of the spiral hollow shaft, hot air makes contact with the
powder, and the
drying efficiency is high; hot
nitrogen flowing through the interior of the spiral hollow shaft enables the temperature of the spiral hollow shaft to rise, the high-temperature spiral hollow shaft carries out
radiation heat transfer on the
powder, and the
powder is uniformly dried.