CN204968605U - Corn ear cleaning plant of threshing - Google Patents

Abstract

<b>The utility model relates to the technical field of corn harvesting machinery, which is a corn ear threshing and cleaning device, which includes a threshing and cleaning frame, a threshing device, a cleaning screen assembly, a wind cleaning device, a grain conveying device and a corn Core chopper, no less than one threshing device is installed on the threshing and cleaning frame, the threshing and cleaning frame below the threshing device is equipped with a cleaning screen assembly, the discharge port at the lower end of the threshing device and the cleaning screen The feeding ports at the upper end of the assembly are connected, and the cleaning screen assembly is provided with a seed outlet and a core discharge port. The utility model is reasonable and compact in structure, easy to use and easy to maintain. It can be installed on a corn harvester to thresh and clean corn ears, threshing through a threshing device, and separating impurities, corncobs and grains through a cleaning screen assembly. The wind cleaning device cleans the grains and transports them to the grain tank, and the corn cobs are chopped and returned to the field by the corn cob chopper, which is labor-saving, simple and efficient. </b>

Description

Corn ear threshing and cleaning device

technical field

The utility model relates to the technical field of corn harvesting machinery, in particular to a corn ear threshing and cleaning device.

Background technique

At present, the research and production technology of foreign corn harvesters has matured, such as the United States, Germany, Ukraine, Russia and other western countries, corn harvesting has basically realized all mechanized operations. Because the planting method is mostly one season per year, the moisture content of corn kernels is very low when harvested. Most countries adopt the harvesting method of corn picking and direct threshing. The vast majority is to replace the corn header 1 on the wheat combine harvester, and carry out the combined harvest of corn by adjusting the rotating speed of the threshing drum and the threshing gap.

With the shortage of labor resources, the mechanization of corn harvesting in my country is becoming more and more popular, and the operation is becoming more and more refined. For the early stage of corn maturity, the grain moisture content is high (between 25% and 35%), and the method of harvesting corn ears is used. method, the self-propelled corn harvester can complete ear picking, peeling, corn ear packing and stalk return or collection operations at one time. The corn ears need to be dried and then threshed by a thresher; in the late stage of corn maturity, the grain moisture content is low ( Between 15% and 25%), generally use the grain combine harvester to replace the corn header, complete the ear picking, corn ear peeling (threshing, separation and cleaning) and other operations at one time. Field roads in vast rural areas have poor adaptability, are expensive, and have great limitations. The current self-propelled corn harvester in China cannot directly harvest the grain.

Contents of the invention

The utility model provides a corn ear threshing and cleaning device, which overcomes the shortcomings of the prior art and can effectively solve the problem that the existing corn harvester has no threshing device and can only harvest the ears but not the grains.

The technical scheme of the utility model is achieved through the following measures: a corn ear threshing and cleaning device, including a threshing and cleaning frame, a threshing device, a cleaning screen assembly, a wind cleaning device, a grain conveying device and a corn cob There is no less than one threshing device installed on the threshing and cleaning frame of the chopper, and a cleaning screen assembly is installed on the threshing and cleaning frame below the threshing device. The feed inlet at the upper end of the threshing machine is connected. The cleaning screen assembly is provided with a seed outlet and a core outlet. The threshing and cleaning frame in front of the threshing device is equipped with a wind cleaning device with a fan. The air inlet of the fan is connected with the cleaning The seed outlet of the screening assembly is connected, the air outlet of the fan is connected with the exhaust outlet of the wind cleaning device, the front of the threshing and cleaning frame is equipped with a grain conveying device, and the seed outlet of the cleaning screen assembly The mouth is communicated with the feeding port of the grain conveying device, and a corncob chopper is arranged below the cleaning sieve assembly, and the core discharge port of the cleaning sieve assembly communicates with the feeding port of the corncob chopper.

Below is the further optimization or/and improvement to above-mentioned utility model technical scheme:

The lower part of the above-mentioned threshing and cleaning frame can be equipped with a driving device, and the driving device is respectively connected with the threshing device, the cleaning screen assembly, the wind cleaning device, the grain conveying device and the corncob chopper and can drive them to work; or/ And, the number of the threshing device can be one, or the number of the threshing device can be two and arranged up and down.

The above-mentioned threshing device may include a drum shaft, a threshing drum and a threshing concave plate; the threshing drum is installed on the threshing cleaning frame through the drum shaft, and the rear end of the drum shaft is equipped with a drum driving wheel that can be connected with the driving device. There are threshing ribs or threshing teeth distributed on the outside, and one or two threshing concave plates are arranged along the outer circumferential direction of the threshing drum. The threshing concave plate is a grid concave plate, and the threshing concave plate includes no less than two grid bars, and the inner side of the grid bar is a circular arc.

The above-mentioned cleaning screen assembly may include a screen frame, an upper screen, a lower screen and a bottom plate; the upper screen, the lower screen and the bottom plate are fixed on the screen frame from top to bottom in sequence, and the upper inlet of the upper screen is connected to the The outlets at the lower end of the threshing device are connected, the core outlet is located at the lower front of the upper screen, the seed outlet is located at the front of the lower screen, and the lower front of the bottom of the screen is provided with a miscellaneous outlet, and the screen frame passes through the boom or / The threshing and cleaning frame is hingedly installed on the threshing and cleaning frame on the left side of the screen frame. A reversing gear box is installed on the threshing and cleaning frame on the left side of the screen frame. The driving wheel and the power output shaft of the reversing gear box are connected with the left rear part of the screen frame through the crank rocker device and can drive the screen frame to move back and forth.

The above-mentioned wind power cleaning device may include an air duct and an air volume regulating device; the fan is fixedly installed on the threshing and cleaning frame in front of the threshing device, the rotating shaft of the fan extends to the rear of the fan, and a fan driving wheel capable of being connected to the driving device is installed , the air inlet of the fan is located at the front end of the fan housing, the air outlet of the fan is located at the upper end of the fan housing, an air duct is fixedly installed on the air inlet of the fan, and an air volume adjustment device is installed on the air duct, and the air volume adjustment device includes a blade rotating shaft 1. The adjusting blade located in the air duct and the handle located outside the air duct. The adjusting blade is installed in the air duct through the blade rotating shaft, the handle is fixed on the outer end of the blade rotating shaft, and the front of the air duct extends downward to the cleaning screen At the seed outlet of the assembly, there is an air inlet connected to the seed outlet. An exhaust and miscellaneous pipe is fixedly installed on the air outlet of the fan. , the front portion of the air exhaust and miscellaneous pipe extends to the front and lower side of the air outlet of the fan, and the air exhaust and miscellaneous outlet is located at the front lower end of the air exhaust and miscellaneous pipe.

The above-mentioned grain conveying device can be a vertical screw conveyor. The lower rear end of the housing of the vertical screw conveyor is provided with a feed port and communicates with the seed outlet of the cleaning screen assembly. The upper part of the housing of the vertical screw conveyor The right end is provided with a discharge port, the inside of the vertical screw conveyor is equipped with a conveying shaft with helical blades, and the lower end of the conveying shaft is equipped with a conveying drive wheel that can be connected with the driving device.

The above-mentioned corn cob chopper may include a chopper housing, a fixed knife, a knife shaft and a cutter roller assembly, the chopper housing is fixedly installed under the front part of the cleaning screen assembly, and the upper end of the chopper housing There is a feed inlet, and the lower end of the cutter housing has a discharge outlet. The cutter shaft is installed in the cutter housing through bearings. The cutter roller assembly is fixed on the outside of the middle part of the cutter shaft. The moving knife is fixed with a fixed knife on the inner wall of the shredder housing and can cooperate with the moving knife to cut, and the outer end of the knife shaft is equipped with a chopping drive wheel that can be connected with the driving device.

The utility model is reasonable and compact in structure, easy to use and easy to maintain. It can be installed on the corn harvester to thresh and clean the corn ears, threshing through the threshing device, and separating impurities, corn cobs and grains through the cleaning screen assembly. The wind cleaning device cleans the grains and transports them to the grain tank, and the corn cobs are chopped and returned to the field by the corn cob chopper, which is labor-saving, simple and efficient.

Description of drawings

Accompanying drawing 1 is the schematic diagram of the front view of the preferred embodiment of the utility model.

Accompanying drawing 2 is the left view structural diagram of accompanying drawing 1.

The codes in the drawings are: 1 is the threshing and cleaning frame, 2 is the seed outlet, 3 is the core discharge port, 4 is the fan, 5 is the exhaust outlet, 6 is the drum shaft, 7 is the threshing drum, 8 is the threshing concave plate, 9 is the screen frame, 10 is the upper screen, 11 is the lower screen, 12 is the bottom plate of the screen, 13 is the miscellaneous discharge port, 14 is the reversing gear box, 15 is the crank rocker device, 16 is Air duct, 17 is an air volume regulating device, 18 is an exhaust air discharge pipe, 19 is a vertical screw conveyor, 20 is a conveying shaft, 21 is a shredder housing, 22 is a fixed knife, 23 is a knife shaft, and 24 is a Move the knife.

detailed description

The utility model is not limited by the following examples, and the specific implementation manner can be determined according to the technical scheme of the utility model and actual conditions.

In this utility model, for the convenience of description, the description of the relative positional relationship of each component is described according to the layout method of Fig. The relationship is determined according to the layout direction of the drawings in the description.

Below in conjunction with embodiment and accompanying drawing, the utility model is further described:

As shown in accompanying drawings 1 and 2, the corn ear threshing and cleaning device comprises a threshing and cleaning frame 1, a threshing device, a cleaning screen assembly, a wind cleaning device, a grain conveying device and a corn cob chopper, and the threshing and cleaning No less than one threshing device is installed on the selection frame 1, and a cleaning screen assembly is installed on the threshing and cleaning frame 1 below the threshing device, and the discharge port at the lower end of the threshing device is connected with the inlet at the upper end of the cleaning screen assembly. The feed port is connected, and the cleaning screen assembly is provided with a seed outlet 2 and a core discharge port 3. A wind cleaning device with a fan 4 is installed on the threshing and cleaning frame 1 in front of the threshing device. The air inlet of the fan 4 is connected to the The 2 seed outlets of the cleaning sieve assembly are connected, and the air outlet of the fan 4 is connected with the exhaust outlet 5 of the wind cleaning device. The seed outlet 2 of the assembly communicates with the feed port of the grain conveying device, a corn cob chopper is arranged under the cleaning sieve assembly, and the core discharge port 3 of the cleaning sieve assembly is connected to the feeding port of the corn cob chopper. The mouth communicates. The ear of corn enters from the feeding port of the threshing device and is threshed by the threshing device. The shed corn kernels and corn cobs enter the cleaning screen assembly and are separated by the cleaning screen assembly. The corn kernels enter the grain conveying device and are transported to the In the grain tank, the corn cob enters the corn cob chopper through the core discharge port 3 for chopping and returning to the field. The utility model can be installed on the corn harvester, and can also be used alone. It can directly harvest corn kernels, and is especially suitable for use on the self-propelled corn harvester. The work of chopping and returning to the field.

According to actual needs, the above corn ear threshing and cleaning device can be further optimized or/and improved:

As shown in accompanying drawings 1 and 2, a driving device is installed on the lower part of the threshing and cleaning frame, and the driving device is respectively connected with the threshing device, the cleaning screen assembly, the wind cleaning device, the grain conveying device and the corncob cutter. able to drive it to work.

According to actual needs, the quantity of the threshing device is one, or as shown in accompanying drawing 1, 2, the quantity of the threshing device is two and is arranged up and down. The threshing effect of the upper and lower threshing devices is better, which can ensure that the corn is fully threshed.

As shown in accompanying drawing 1,2, threshing device comprises drum shaft 6, threshing drum 7 and threshing concave plate 8; The drum driving wheel that can be connected with the driving device, the outer side of the threshing drum 7 is distributed with threshing ribs or threshing teeth, and one or two threshing concave plates 8 are arranged along the outer circumferential direction of the threshing drum 7, and the threshing concave plates 8 pass through the adjustment mechanism Installed on the threshing and cleaning frame 1 and capable of adjusting the gap between its inner side and the outer side of the threshing cylinder 7, the threshing concave plate 8 is a grid concave plate, and the threshing concave plate 8 includes no less than two grid bars, the grid bars The inner side of the cross-section is a circular arc. The gap between the threshing concave plate 8 and the threshing cylinder 7 is adjusted by the adjustment mechanism to adapt to corn ears of different varieties and sizes; the inner side of the cross section of the grid bar is a circular arc to prevent damage to the grain during threshing, effectively improving the separation effect .

As shown in accompanying drawings 1 and 2, the cleaning screen assembly includes a screen frame 9, an upper screen 10, a lower screen 11 and a screen bottom 12; the upper screen 10, the lower screen 11 and the bottom 12 screen Fixed on the screen frame 9 in turn, the upper inlet of the upper screen 10 communicates with the discharge port at the lower end of the threshing device, the core discharge port 3 is located at the front lower end of the upper screen 10, and the seed outlet 2 is located at the front end of the lower screen 11 , the lower end of the front part of the sieve bottom plate 12 is provided with a miscellaneous discharge port 13, and the sieve frame 9 is hingedly installed on the threshing and cleaning frame 1 through a suspender or/and a support rod, and on the threshing and cleaning frame 1 on the left side of the sieve frame 9 Reversing gear box 14 is installed, and the cleaning driving wheel that can be connected with driving device is installed on the input shaft of reversing gear box 14, and the power output shaft of reversing gear box 14 passes crank rocker device 15 and screen frame 9 The left rear part is connected and can drive the screen frame 9 to reciprocate back and forth. The crank rocker device 15 converts the circular motion into a reciprocating motion, drives the screen frame 9 to move back and forth to make the cleaning screen assembly realize the function of a vibrating screen, and the upper screen 10 separates the corn kernels from the corn cob, and the corn kernels pass through the upper screen. The mesh of 10 falls into the lower screen 11, and the corn cob is sent to the corn cob cutter through the core discharge port 3; the lower screen 11 realizes the separation of grains and small impurities, and the small impurities pass through the mesh of the lower screen 11 Falling on the inner sieve, the corn grains are sent to the feed port of the grain conveying device through the seed outlet 2, and the light impurities in the corn kernels at the seed outlet 2 are sucked into the air inlet of the wind cleaning device by negative pressure, and finally Small impurities on the inner screen are discharged from the miscellaneous discharge port 13 and fall to the ground due to vibration, and only discharged from the miscellaneous discharge port 13 can prevent impurities such as sand, lime, and soil from floating randomly and reduce the generation of dust.

As shown in accompanying drawings 1 and 2, the wind power cleaning device includes an air duct 16 and an air volume regulating device 17; the fan 4 is fixedly installed on the threshing and cleaning frame 1 in front of the threshing device, and the rotating shaft of the fan 4 extends to the rear of the fan 4, And the blower fan driving wheel that can be connected with driving device is installed, the air inlet of blower fan 4 is positioned at the casing front end of blower blower 4, and the blower outlet of blower blower 4 is positioned at the casing upper end of blower blower 4, and the blower blower 4 is fixedly installed with Air duct 16, air volume regulating device 17 is installed on the air duct 16, air volume regulating device 17 comprises the blade rotating shaft, the adjusting blade positioned in the air duct 16 and the handle positioned at the outside of the air duct 16, the adjusting blade is installed through the blade rotating shaft In the air duct 16, the handle is fixed on the outer end of the blade rotating shaft, and the front part of the air duct 16 extends downward to the seed outlet 2 of the cleaning screen assembly, and is provided with an air inlet communicating with the seed outlet 2 , on the exhaust outlet of blower fan 4, exhaust miscellaneous pipe 18 is fixedly installed, and the entrance of the lower end of exhaust exhaust miscellaneous pipe 18 rear part communicates with the air exhaust outlet of blower fan 4, and the front portion of exhaust miscellaneous pipe 18 is exhausted to fan 4. The front and lower sides of the tuyere extend, and the air exhaust and miscellaneous outlet 5 is located at the front lower end of the air exhaust and miscellaneous pipe 18 . The rotation of the rotating shaft of the fan 4 generates a negative pressure airflow, which flows in the air duct 16 and sucks out the light impurities mixed in the corn kernels, and then the light impurities are discharged with the airflow through the exhaust outlet 5, and the wind cleaning system The air volume regulating device 17 can adjust and control the air volume according to the water content and impurity content of the corn grains, so as to reduce the impurity content of the corn grains.

As shown in accompanying drawings 1 and 2, the grain conveying device is a vertical screw conveyor 19, and the rear end of the lower part of the housing of the vertical screw conveyor 19 is provided with a feed port and communicates with the seed outlet 2 of the cleaning screen assembly , the upper right end of the casing of the vertical screw conveyor 19 is provided with a discharge port, the inside of the vertical screw conveyor 19 is equipped with a conveying shaft 20 with helical blades, and the lower end of the conveying shaft 20 is equipped with a Delivery drive wheels. The threshed and separated grains can be lifted to the grain tank by the vertical screw conveyor 19, and the continuity of conveying materials is better.

As shown in accompanying drawings 1 and 2, the corn cob chopper includes a chopper housing 21, a fixed knife 22, a knife shaft 23 and a knife roller assembly, and the chopper housing 21 is fixedly installed on the top of the cleaning screen assembly. Below the front part, the upper end of the chopper housing 21 has a feed port, and the lower end of the chopper housing 21 has a discharge port. The knife shaft 23 is installed in the chopper housing 21 through a bearing, and the knife roller assembly is fixed. On the outside of the middle part of the knife shaft 23, a moving knife 24 is evenly distributed and fixed on the outside of the knife roller assembly. The cutting drive wheel that can be connected with the driving device is installed on the end. After the corn cob enters through the feeding port of the chopper housing 21, it is chopped by the high-speed rotating moving knife 24 and falls to the ground to return to the field.

The above technical features constitute the best embodiment of the utility model, which has strong adaptability and best implementation effect, and non-essential technical features can be increased or decreased according to actual needs to meet the needs of different situations.

Claims (10)

1. a corn ear threshing cleaning unit, it is characterized in that comprising threshing and cleaning frame, sheller unit, sorting screen assembly, removing impurities by wind power device, grain conveyor and corncob chopper, threshing and cleaning frame is provided with the sheller unit being no less than, threshing and cleaning frame below sheller unit is provided with sorting screen assembly, the discharging opening of sheller unit lower end communicates with the charging aperture of sorting screen assembly upper end, sorting screen assembly is provided with seed outlet and core discharging outlet, the threshing and cleaning frame in sheller unit front is provided with the removing impurities by wind power device of band blower fan, the air inlet of blower fan communicates with the seed outlet place of sorting screen assembly, the exhaust outlet of blower fan exports with the air draft impurities removal of removing impurities by wind power device and communicates, threshing and cleaning frame front portion is provided with grain conveyor, the seed outlet of sorting screen assembly communicates with the charging aperture of grain conveyor, corncob chopper is provided with below sorting screen assembly, the core discharging outlet of sorting screen assembly communicates with the charging aperture of corncob chopper.

2. corn ear threshing cleaning unit according to claim 1, it is characterized in that threshing and cleaning frame bottom is provided with drive unit, drive unit is connected with sheller unit, sorting screen assembly, removing impurities by wind power device, grain conveyor and corncob chopper respectively and can drives its work; Or/and the quantity of sheller unit is one, or the quantity of sheller unit is two and in arranging up and down.

3. corn ear threshing cleaning unit according to claim 1 and 2, is characterized in that sheller unit comprises roller shaft, threshing cylinder and threshing concave plate; Threshing cylinder is arranged in threshing and cleaning frame by roller shaft, the rear end of roller shaft is provided with the cylinder drive gear that can be connected with drive unit, the outside of threshing cylinder is distributed with threshing muscle or threshing tooth, outer circumference direction along threshing cylinder is provided with one piece or two pieces of threshing concave plates, threshing concave plate to be arranged in threshing and cleaning frame by governor motion and can to adjust inside it and outside threshing cylinder between gap, threshing concave plate is grid concave plate, threshing concave plate comprises the grizzly bar being no less than two, is circular arc inside the cross section of grizzly bar.

4. corn ear threshing cleaning unit according to claim 1 and 2, is characterized in that sorting screen assembly comprises screen frame (unit), upper screen cloth, lower screen cloth and bottom screening plate, upper screen cloth, lower screen cloth and bottom screening plate are from top to bottom fixed on screen frame (unit) successively, the upper end import of upper screen cloth communicates with the discharging opening of sheller unit lower end, core discharging outlet is positioned at the front lower ends of upper screen cloth, seed outlet is positioned at the front end of lower screen cloth, the front lower ends of bottom screening plate is provided with impurity discharging port, screen frame (unit) by suspension rod or/and pole is hingedly mounted in threshing and cleaning frame, the threshing and cleaning frame of screen frame (unit) left is provided with reverse box, the power shaft of reverse box is provided with can be connected with drive unit clean driving wheel, the power take-off of reverse box to be connected with the left back portion of screen frame (unit) by crank rocker device and can to drive screen frame (unit) front-rear reciprocation movement.

5. corn ear threshing cleaning unit according to claim 3, is characterized in that sorting screen assembly comprises screen frame (unit), upper screen cloth, lower screen cloth and bottom screening plate, upper screen cloth, lower screen cloth and bottom screening plate are from top to bottom fixed on screen frame (unit) successively, the upper end import of upper screen cloth communicates with the discharging opening of sheller unit lower end, core discharging outlet is positioned at the front lower ends of upper screen cloth, seed outlet is positioned at the front end of lower screen cloth, the front lower ends of bottom screening plate is provided with impurity discharging port, screen frame (unit) by suspension rod or/and pole is hingedly mounted in threshing and cleaning frame, the threshing and cleaning frame of screen frame (unit) left is provided with reverse box, the power shaft of reverse box is provided with can be connected with drive unit clean driving wheel, the power take-off of reverse box to be connected with the left back portion of screen frame (unit) by crank rocker device and can to drive screen frame (unit) front-rear reciprocation movement.

6. the corn ear threshing cleaning unit according to claim 1 or 2 or 5, is characterized in that removing impurities by wind power device comprises air channel and volume adjusting apparatus, blower fan is fixedly mounted in the threshing and cleaning frame in sheller unit front, the rotating shaft of blower fan extends blower fan rear, and the blower fan driving wheel that can be connected with drive unit is installed, the air inlet of blower fan is positioned at the housing forward end of blower fan, the exhaust outlet of blower fan is positioned at the housing upper end of blower fan, the air inlet of blower fan is installed with air channel, air channel is provided with volume adjusting apparatus, volume adjusting apparatus comprises impeller rotating shaft, be positioned at the adjustment impeller in air channel and be positioned at the handle of outside, air channel, impeller is regulated to be arranged in air channel by impeller rotating shaft, handle is fixed on the outer end of impeller rotating shaft, the front portion in air channel extends downward the seed outlet place of sorting screen assembly, and be provided with the air inlet communicated with seed outlet, the exhaust outlet of blower fan is installed with air draft impurity-discharging pipe, the import of lower end, air draft impurity-discharging pipe rear portion communicates with the exhaust outlet of blower fan, the front portion of air draft impurity-discharging pipe extends to the exhaust outlet front lower place of blower fan, air draft impurities removal outlet is positioned at the front lower ends of air draft impurity-discharging pipe.

7. corn ear threshing cleaning unit according to claim 3, is characterized in that removing impurities by wind power device comprises air channel and volume adjusting apparatus, blower fan is fixedly mounted in the threshing and cleaning frame in sheller unit front, the rotating shaft of blower fan extends blower fan rear, and the blower fan driving wheel that can be connected with drive unit is installed, the air inlet of blower fan is positioned at the housing forward end of blower fan, the exhaust outlet of blower fan is positioned at the housing upper end of blower fan, the air inlet of blower fan is installed with air channel, air channel is provided with volume adjusting apparatus, volume adjusting apparatus comprises impeller rotating shaft, be positioned at the adjustment impeller in air channel and be positioned at the handle of outside, air channel, impeller is regulated to be arranged in air channel by impeller rotating shaft, handle is fixed on the outer end of impeller rotating shaft, the front portion in air channel extends downward the seed outlet place of sorting screen assembly, and be provided with the air inlet communicated with seed outlet, the exhaust outlet of blower fan is installed with air draft impurity-discharging pipe, the import of lower end, air draft impurity-discharging pipe rear portion communicates with the exhaust outlet of blower fan, the front portion of air draft impurity-discharging pipe extends to the exhaust outlet front lower place of blower fan, air draft impurities removal outlet is positioned at the front lower ends of air draft impurity-discharging pipe.

8. corn ear threshing cleaning unit according to claim 4, is characterized in that removing impurities by wind power device comprises air channel and volume adjusting apparatus, blower fan is fixedly mounted in the threshing and cleaning frame in sheller unit front, the rotating shaft of blower fan extends blower fan rear, and the blower fan driving wheel that can be connected with drive unit is installed, the air inlet of blower fan is positioned at the housing forward end of blower fan, the exhaust outlet of blower fan is positioned at the housing upper end of blower fan, the air inlet of blower fan is installed with air channel, air channel is provided with volume adjusting apparatus, volume adjusting apparatus comprises impeller rotating shaft, be positioned at the adjustment impeller in air channel and be positioned at the handle of outside, air channel, impeller is regulated to be arranged in air channel by impeller rotating shaft, handle is fixed on the outer end of impeller rotating shaft, the front portion in air channel extends downward the seed outlet place of sorting screen assembly, and be provided with the air inlet communicated with seed outlet, the exhaust outlet of blower fan is installed with air draft impurity-discharging pipe, the import of lower end, air draft impurity-discharging pipe rear portion communicates with the exhaust outlet of blower fan, the front portion of air draft impurity-discharging pipe extends to the exhaust outlet front lower place of blower fan, air draft impurities removal outlet is positioned at the front lower ends of air draft impurity-discharging pipe.

9. the corn ear threshing cleaning unit according to claim 1 or 2 or 5 or 7 or 8, it is characterized in that grain conveyor is vertical auger conveyor, the lower housing portion rear end of vertical auger conveyor is provided with charging aperture and communicates with the seed outlet of sorting screen assembly, the housing upper right-hand member of vertical auger conveyor is provided with discharging opening, the inside of vertical auger conveyor is provided with the conveying rotating shaft of band helical blade, and the lower end of conveying rotating shaft is provided with the feed drive that can be connected with drive unit and takes turns; Or/and, corncob chopper comprises chopper housing, stationary knife, cutter shaft and rotor assembly, chopper housing is fixedly mounted on the lower front of sorting screen assembly, there is charging aperture the upper end of chopper housing, there is discharging opening the lower end of chopper housing, cutter shaft is arranged in chopper housing by bearing, rotor assembly is fixed on outside the middle part of cutter shaft, be uniformly distributed outside rotor assembly and be fixed with moving knife, the inwall of chopper housing is fixed with stationary knife and can coordinates with moving knife and shear, the outer end of cutter shaft is provided with the chopping driving wheel that can be connected with drive unit.

10. corn ear threshing cleaning unit according to claim 6, it is characterized in that grain conveyor is vertical auger conveyor, the lower housing portion rear end of vertical auger conveyor is provided with charging aperture and communicates with the seed outlet of sorting screen assembly, the housing upper right-hand member of vertical auger conveyor is provided with discharging opening, the inside of vertical auger conveyor is provided with the conveying rotating shaft of band helical blade, and the lower end of conveying rotating shaft is provided with the feed drive that can be connected with drive unit and takes turns; Or/and, corncob chopper comprises chopper housing, stationary knife, cutter shaft and rotor assembly, chopper housing is fixedly mounted on the lower front of sorting screen assembly, there is charging aperture the upper end of chopper housing, there is discharging opening the lower end of chopper housing, cutter shaft is arranged in chopper housing by bearing, rotor assembly is fixed on outside the middle part of cutter shaft, be uniformly distributed outside rotor assembly and be fixed with moving knife, the inwall of chopper housing is fixed with stationary knife and can coordinates with moving knife and shear, the outer end of cutter shaft is provided with the chopping driving wheel that can be connected with drive unit.