Negative pressure type grain secondary winnowing device

Abstract

The invention relates to a negative pressure type grain secondary winnowing device. A first winnowing part A comprises a winnowing shell, a winnowing shaft and a plurality of winnowing sheets, an air duct is arranged on the upper part of the winnowing shell, the interior of the air duct communicates with the interior of the winnowing shell, an air suction opening A is formed in the upper part of the air duct, a left air inlet A and a discharging opening are formed in the left end of the winnowing shell, a right air inlet A and a feeding opening are formed in the right end of the winnowing shell, the multiple winnowing sheets are fixed to the winnowing shaft, and the two ends of a shaft head are correspondingly arranged on a left bearing seat and a right bearing seat. A second winnowing part B comprises an upper bearing frame, a lower bearing frame and a spiral shaft, the upper bearing frame is fixed to the upper part of the inner wall of a outer barrel, the lower bearing frame is fixed to the upper part of the inner wall of a cone, a short shaft is fixed to the top of an inner barrel and provided with an upper bearing, the upper bearing is installed on the upper bearing frame, a plurality of fan blades are fixed to the outer wall of the lower part of the inner barrel, the spiral shaft is fixed at the bottom of the inner barrel, a lower bearing is installed on the spiral shaft, and the lower bearing is arranged on the lower bearing frame.

Description

technical field [0001] The invention relates to the technical field of agricultural machinery, in particular to a negative pressure type secondary air separation device for grain. Background technique [0002] Most of the cleaning methods used by combine harvesters and threshers today use fan blowing. The fan is set under the sieve, and the wind blown by the fan faces the grains falling from the sieve. When the grains fall in the air, the wind will The lighter impurities are blown out, and the heavier grains fall down and enter the granary through the conveying device. This cleaning method has a better cleaning effect on large grains such as corn, wheat, soybeans, etc., but for small grains such as millet and rape. The cleaning effect is not good. If the air volume is large, it is easy to blow out the seeds, but if the air volume is small, no debris can be blown out. Due to the limitation of the height and volume of the combine harvester and thresher, the height of the air ...

AI Technical Summary

Problems solved by technology

[0002] Most of the cleaning methods used by combine harvesters and threshers today use fan blowing. The fan is set under the sieve, and the wind blown by the fan faces the grains falling from the sieve. When the grains fall in the air, the wind will The lighter impurities are blown out, and the heavier grains fall down and enter the granary through the conveying device. This cleaning method has a better cleaning effect on large grains such as corn, wheat, soybeans, etc., but for small grains such as millet and rape. The cleaning effect is not good. If the air volume is large, it is easy to blow out the seeds, but if the air volume is small, no debris can be blown out.

Due to the limitation of the height and volume of the combine harvester and thresher, the height of the air duct is relatively short, the grain falls from the sieve, and the time of staying in the air is too short, some impurities fall without being blown out, and fall down and mix with the grain , affecting the cleanliness of the grain

If the air volume of the fan is increased, the seeds are easily blown out, causing losses

If the operation is carried out on the side of the village or on the roadside, the impurities blown out are not easy to collect when using this cleaning method to clean the grains, and the lighter impurities fly with the wind and pollute the environment.

[0003] The ZL200820001625X patent discloses a grain cleaning device. The grain cleaning device has good winnowing performance and less loss, but has a disadvantage. When relatively long and large impurities are sucked in, the impurities will overlap each other on the discharge port and accumulate more The more the outlet is blocked, if it is not cleaned in time, the seeds will be sucked out by the exhaust fan along with the impurities, causing losses

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