CN113457974A - Negative pressure formula cereal second grade wind selector - Google Patents

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 poplar grain pieces, wherein an air duct is arranged at the upper part of the winnowing shell, the interior of the air duct is communicated with the interior of the winnowing shell, an air suction opening A is arranged at the upper part of the air duct, a left air inlet A and a discharge opening are arranged at the left end of the winnowing shell, a right air inlet A and a feed opening are arranged at the right end of the winnowing shell, a plurality of winnowing pieces are fixed on the winnowing shaft, and two ends of the shaft head are respectively arranged on a left bearing block and a right bearing block; the second winnowing portion B comprises an upper bearing frame, a lower bearing frame and a screw shaft, the upper bearing frame is fixed on the upper portion of the inner wall of the outer barrel, the lower bearing frame is fixed on the upper portion of the inner wall of the cone, the short shaft is fixed on the top of the inner barrel, the upper bearing is installed on the upper bearing frame, the outer wall of the lower portion of the inner barrel is fixed with a plurality of fan blades, the screw shaft is fixed at the bottom of the inner barrel, the lower bearing is installed on the screw shaft, and the lower bearing is installed on the lower bearing frame.

Description

Negative pressure formula cereal second grade wind selector

Technical Field

The invention relates to the technical field of agricultural machinery, in particular to a negative pressure type grain secondary winnowing device.

Background

The existing cleaning method adopted by the combine harvester and the thresher mostly adopts a fan blowing method, the fan is arranged below a sieve, air blown by the fan faces grains falling from the sieve, the grains blow light impurities out in the process of falling in the air, and heavier grains fall off and enter a granary through a conveying device. Because of the limit of the height and the volume of the combine harvester and the thresher, the height of the air duct is short, grains fall from the screen, the standing time in the air is too short, some impurities fall without being blown out, and the grains fall and are mixed with grains, so that the cleanliness of the grains is influenced. If the air quantity of the fan is increased, the seeds are easily blown out, and loss is caused. If the grain is cleaned by the cleaning method at the side of a village or a roadside, the blown impurities are not easy to collect, and the lighter impurities fly with wind, thereby further polluting the environment.

The ZL200820001625X patent discloses a grain cleaning device, which has good air separation performance and less loss, but has a disadvantage that when relatively long and large impurities are sucked in, the impurities are overlapped on the discharge port, the more impurities are accumulated, the discharge port is blocked, and if the impurities are not cleaned in time, grains are sucked out by an exhaust fan along with the impurities, so that the loss is caused.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a negative pressure type grain secondary winnowing device which is good in winnowing effect, high in efficiency and small in loss.

In order to achieve the purpose, the invention is realized by the following technical scheme: a negative pressure type secondary grain winnowing device comprises a first winnowing part A and a second winnowing part B, wherein the first winnowing part A and the second winnowing part B are connected through air pipe elbows; the winnowing machine is characterized in that the first winnowing part A comprises a winnowing shell, a winnowing shaft and poplar grain pieces, an air duct is arranged at the upper part of the winnowing shell, the interior of the air duct is communicated with the interior of the winnowing shell, an air suction opening A is arranged at the upper part of the air duct, a left air inlet A and a discharge opening are arranged at the left end of the winnowing shell, a right air inlet A and a feed opening are arranged at the right end of the winnowing shell, a plurality of winnowing pieces are fixed on the winnowing shaft, the winnowing pieces are axially arranged and obliquely distributed on the winnowing shaft, two ends of a shaft head are respectively arranged on a left bearing seat and a right bearing seat, and a driving wheel is arranged at one end of the shaft head;

the second winnowing portion B comprises an upper bearing frame, a lower bearing frame and a spiral shaft, the upper bearing frame is fixed on the upper portion of the inner wall of the outer barrel, the lower bearing frame is fixed on the upper portion of the inner wall of the cone, the short shaft is fixed on the top of the inner barrel, the upper bearing is installed on the upper bearing frame, the outer wall of the lower portion of the inner barrel body is fixedly provided with a plurality of fan blades, the left air inlet B and the right air inlet B are opposite to the fan blades, the spiral shaft is fixed at the bottom of the inner barrel body, the spiral shaft is provided with the lower bearing, and the lower bearing is installed on the lower bearing frame.

The invention has the following beneficial effects: the invention relates to a negative pressure type grain secondary winnowing device, which can suck most of impurities lighter than grains and few light grains in grains from an air suction opening in a primary winnowing part, enter a second winnowing part through an air pipe elbow, and suck more than 99 percent of impurities lighter than grains from the air suction opening in the second winnowing part; but also can separate the grains mixed with the impurities and discharge the grains from the discharge port. Therefore, the cleanliness of the seeds can be greatly improved, and the cleaning loss is greatly reduced; the impurities discharged by the exhaust fan can be collected by cloth bag dust removal or other methods, so that the environmental pollution is greatly reduced.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic view of the structure of the first air separation part A and the second air separation part B after the air pipes are connected by bends;

FIG. 2 is a schematic view of a left side partial cut-away structure of a first air separation part A of the present invention;

FIG. 3 is a schematic view of the right side of the first air separation part A;

FIG. 4 is a right side A sectional view of the first air separation section A of the present invention;

fig. 5 is a partial sectional view of the second air separation part B of the present invention;

fig. 6 is a sectional view of the second air separation section B in the top view B.

1. The air duct comprises an air duct body 2, an air separation shell body 3, a discharge port 3, a grain raising shaft 4, a grain raising sheet 5, a feed port 6, a feed port 7, a left air inlet A, a left bearing seat 8, a right bearing seat 9, an air suction port A, an air suction port 11, a right air inlet A, a driving wheel 12, a driving wheel 13, an air suction port B, an air suction port 14, an upper bearing frame 15, an upper bearing 16, an inner barrel body 17, an outer barrel body 18, a right air inlet B, a fan blade 19, a lower bearing frame 20, a lower cone 21, a screw shaft 22, a discharge port 23, a lower bearing 24, a left air inlet B, a short shaft 26 and an air duct elbow 27.

Detailed Description

The invention is described in further detail below with reference to the figures and the specific embodiments.

As seen in fig. 1-6: a negative pressure type two-stage grain winnowing device comprises a first winnowing part A and a second winnowing part B, wherein the first winnowing part A and the second winnowing part B are connected by an air pipe elbow 27; the first winnowing part A is characterized by comprising a winnowing shell 2, a winnowing shaft 4 and poplar grain pieces 5, wherein an air duct 1 is arranged at the upper part of the winnowing shell 2, the interior of the air duct 1 is communicated with the interior of the winnowing shell 2, an air suction opening A10 is arranged at the upper part of the air duct 1, a left air inlet A7 and a discharge opening 3 are arranged at the left end of the winnowing shell 2, a right air inlet A11 and a feed opening 6 are arranged at the right end of the winnowing shell, a plurality of winnowing pieces 5 are fixed on the winnowing shaft 4, the winnowing pieces 5 are axially arranged and obliquely distributed on the winnowing shaft 4, two ends of a shaft head are respectively arranged on a left bearing seat 8 and a right bearing seat 9, and a driving wheel 12 is arranged at one end of the shaft head;

the second air separation part B comprises an upper bearing frame 14, a lower bearing frame 20 and a screw shaft 22, the upper bearing frame 14 is fixed on the upper portion of the inner wall of the outer barrel body 17, the lower bearing frame 20 is fixed on the upper portion of the inner wall of the cone 21, the short shaft 26 is fixed on the top of the inner barrel body 16, the upper bearing 15 is installed on the short shaft 26, the upper bearing 15 is installed on the upper bearing frame 14, a plurality of fan blades 19 are fixed on the outer wall of the lower portion of the inner barrel body 16, the left air inlet B25 and the right air inlet B18 are opposite to the fan blades 19, the screw shaft 22 is fixed at the bottom of the inner barrel body 16, the screw shaft 22 is provided with a lower bearing 24, and the lower bearing 24 is installed on the lower bearing frame 20.

The specific working principle and steps are as follows:

when the grain winnowing machine is used, the exhaust fan is started to generate negative pressure inside the first winnowing part A and the second winnowing part B, threshed grains are sent into the feeding hole 6, and the rotary winnowing sheet 5 lifts the grains, so that the grains form a rotary, hollow and sparse long cylindrical grain layer in the winnowing shell 2; the winnowing blades 5 are arranged obliquely and are influenced by the oblique thrust of the winnowing blades 5, and each time the grains rotate for one circle, the grains move a little towards the discharge hole 3 until the grains are discharged from the discharge hole 3. The air entering from the left air inlet A7 and the right air inlet A11 blows impurities lighter than seeds and few light seeds to enter the second winnowing part B through the air duct 1, the air suction opening A10, the air duct elbow 27 and the left air inlet 25B. The longer winnowing shell 2 ensures that the time for grains to move from the feed inlet 6 to the discharge outlet 3 is longer, and the sufficient winnowing time ensures that most of impurities lighter than grains and few light grains are sucked into the second winnowing part B.

The inside of the second winnowing part B is negative pressure, the left air inlet B25 and the right air inlet B18 are tangent to the outer wall of the outer cylinder 17, impurities lighter than grains and few light grains enter the second winnowing part B, a high-speed rotating cyclone can be generated in the outer cylinder 17, the air suction opening 13 is arranged at the top of the outer cylinder 17, the impurities lighter than the grains are large in size and light in weight, rotate and ascend at the same time, and are finally discharged from the air suction opening 13, few light grains are small in size and heavy in weight, rotate and descend at the same time, and finally fall into the conical body 21, and under the thrust action of the rotating screw shaft 22, the impurities are discharged from the discharge opening 23 and enter the screening device for screening.

The above description is only for the preferred embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention disclosed in the present invention should be covered within the protection scope of the present invention.

Claims (1)

1. The utility model provides a negative pressure formula second grade cereal wind selector, includes first selection by winnowing portion A, second selection by winnowing portion B, first selection by winnowing portion A and second selection by winnowing portion B are connected its characterized in that with tuber pipe elbow 27:

the first winnowing part A comprises a winnowing shell 2, a winnowing shaft 4 and poplar grain pieces 5, wherein an air duct 1 is arranged at the upper part of the winnowing shell 2, the inside of the air duct 1 is communicated with the inside of the winnowing shell 2, an air suction opening A10 is arranged at the upper part of the air duct 1, a left air inlet A7 and a discharge opening 3 are arranged at the left end of the winnowing shell 2, a right air inlet A11 and a feed opening 6 are arranged at the right end of the winnowing shell, a plurality of winnowing pieces 5 are fixed on the winnowing shaft 4, the winnowing pieces 5 are axially arranged and obliquely distributed on the winnowing shaft 4, two ends of a shaft head are respectively arranged on a left bearing seat 8 and a right bearing seat 9, and a driving wheel 12 is arranged at one end of the shaft head;

the second air separation part B comprises an upper bearing frame 14, a lower bearing frame 20 and a screw shaft 22, the upper bearing frame 14 is fixed on the upper portion of the inner wall of the outer barrel body 17, the lower bearing frame 20 is fixed on the upper portion of the inner wall of the cone 21, the short shaft 26 is fixed on the top of the inner barrel body 16, the upper bearing 15 is installed on the short shaft 26, the upper bearing 15 is installed on the upper bearing frame 14, a plurality of fan blades 19 are fixed on the outer wall of the lower portion of the inner barrel body 16, the left air inlet B25 and the right air inlet B18 are opposite to the fan blades 19, the screw shaft 22 is fixed at the bottom of the inner barrel body 16, the screw shaft 22 is provided with a lower bearing 24, and the lower bearing 24 is installed on the lower bearing frame 20.

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