The air uniformizing device comprises an air uniformizing
barrel, a spiral air duct is arranged in the air uniformizing
barrel, air inlets are symmetrically formed in the two ends, located in the center of the inner side, of the spiral air duct, and the air inlets are provided with air outlets which are obliquely upward and located at the ends, located on the outer side, of the air inlets. The grain cleaning
machine comprises a
winnowing settling chamber, a dust removal device, a fan, a motor and the air uniformizing device, a grain inlet is formed in one side of the
winnowing settling chamber, an air inlet communicated with the air outlet of the air uniformizing device is formed below the grain inlet, and a grain outlet is formed in the bottom of the
winnowing settling chamber; an air collecting box is arranged at the top of the dust removal device and communicated with an air inlet of a fan, an air distributing
pipe is arranged at an air outlet of the fan, and two
branch air pipes of the air distributing
pipe are communicated with an air inlet
pipe of the air uniformizing device through main air pipes respectively. The speed of air exhausted from the air outlet of the air uniformizing device is uniformly distributed, the grain cleaning
machine exhausts part of air through the air distributing pipe, a small amount of air is supplemented and sucked through the air suction opening, air quantity balance and
airflow internal circulation in the winnowing
system are achieved, and equipment operation
energy consumption is reduced.