Combined cleaning equipment of a raw grain air
sieve comprises a framework, a
winnowing sieve, a
crank and connecting rod mechanism, an
air blast system, a
transmission system, a dust collection cover, a vibration classifying
sieve and a spiral light
impurity conveyer. The
winnowing sieve is a dustpan type groove, an included
angle alpha is formed between the bottom of the
winnowing sieve and the horizontal plane, the winnowing sieve, a supporting rocking bar and the framework form a four-bar linkage, the
crank and connecting rod mechanism drives the four-bar linkage to form a
crank four-bar linkage, the front end of the winnowing sieve corresponds to an inlet of the vibration classifying sieve, an included angle beta is formed between the bottom of the vibration classifying sieve and the horizontal plane, the rear end of the winnowing sieve corresponds to an inlet of the spiral light
impurity conveyer, the
transmission system is connected with a rotor of an
air blower, the crank four-bar linkage and the spiral light
impurity conveyer by belts, the
air blast system is arranged under the winnowing sieve, the rotor of the
air blower is mounted in an air bellow, the air bellow is connected with the winnowing sieve via flexible materials, the dust collection cover covers the winnowing sieve, the spiral light impurity conveyer, the
air blast system, the
transmission system and the crank four-bar linkage, and a grain inlet and a dust
discharge opening are arranged on the upper portion of the dust collection cover. The combined cleaning equipment is high in yield and impurity removal rate.