A double-cylinder screen cleaning device and a longitudinal axial flow regenerated rice combine harvester thereof

Abstract

The present invention provides a double-cylinder screen cleaning device and a longitudinal axial flow regenerated rice combine harvester thereof, including a double-cylinder screen and a double-outlet cleaning fan, wherein the lower air outlet of the double-outlet cleaning fan is located in front of the double-cylinder screen, and is used to cooperate with the double-cylinder screen to blow large debris out of the machine; the upper air outlet of the double-outlet cleaning fan is located above the double-cylinder screen, and is used to blow light debris discharged by the threshing device directly out of the machine. The grain slide plate and the shaking plate divide the cleaning chamber into an upper cleaning area and a lower cleaning area, wherein the upper cleaning area is used to blow light debris discharged by the threshing device directly out of the machine; and the lower cleaning area is used to blow large debris out of the machine. The present invention makes full use of the limited longitudinal space between the threshing device and the cleaning mechanism for preliminary air selection, which can reduce the design power of the cylindrical screen, and reasonably utilize the fan to blow light debris directly out of the machine without the need for throwing through the cylindrical screen.

Description

Technical Field

[0001] The invention relates to the field of harvester cleaning devices or agricultural harvesting equipment, and in particular to a double-cylinder screen cleaning device and a longitudinal axial flow regenerated rice combine harvester thereof. Background Art

[0002] Raised rice is a type of rice variety that uses dormant buds that survive on rice stubble after harvesting to make it head and mature again. It has many advantages over traditional rice. In recent years, rice yield has reached a bottleneck, and planting ratoon rice can effectively increase the multiple cropping index and increase rice yield. When harvesting the first season of rice, the crop has lush stems and green leaves and high moisture content; in order to ensure that the rice stubble can head again in the second season, there is an agronomic requirement for high stubble retention when harvesting the first season of ratoon rice; at the same time, it is inevitable that the harvester will crush the rice stubble after harvesting, and the loss should be minimized.

[0003] The threshing device is an important working part of the combine harvester, which is used to separate the fed crop grains from their stems. According to the layout characteristics of the threshing drum, the commonly used threshing devices can be roughly divided into transverse flow and longitudinal flow. Among them, the transverse flow threshing device has a simple structure, convenient maintenance, and universal accessories, but its harvesting variety is single. In contrast, the longitudinal flow threshing device has a large threshing area, good effect, and is suitable for a variety of crops.

[0004] The cleaning device is an important part of the rice-wheat combine harvester, and its performance directly affects the operation effect of the whole machine. The fan-vibrating screen cleaning device has high stability and strong adaptability, and is currently the most widely used cleaning device. However, its structure is large and complex, with high power requirements and large vibrations. When the moisture content of the effluent is high, the cleaning efficiency decreases and it is easy to get blocked. Therefore, it cannot fully meet the working requirements of the regenerated rice harvester. When harvesting regenerated rice in the first season, there is an agronomic requirement of high stubble, that is, only about 40 cm below the rice ear head is harvested. Compared with harvesting traditional rice, the moisture content of the effluent of regenerated rice is high and the grain content is extremely large, which can reach 80% to 90%. The rest is generally a combination of light debris and short stems. Therefore, under the appropriate feeding amount, it is more suitable to use a cylindrical screen cleaning mechanism when harvesting regenerated rice than when harvesting traditional rice.

[0005] Compared with the vibrating screen cleaning device, the double drum screen cleaning device has a simple structure, reliable operation, light weight, small vibration, good moisture separation performance, and good cleaning effect on materials with high grain content and low impurity content, which meets the characteristics of regenerated rice products. However, due to its structural characteristics, the traditional drum screen cleaning mechanism is usually used in conjunction with the horizontal axial flow threshing drum, such as Figure 1As shown, the cylindrical screen is placed horizontally in the casing, and the cylindrical screen axis is arranged in parallel with the threshing drum axis and the fan axis. The front screen is located directly below the threshing drum. The threshed material first falls on the front cylindrical screen, and the rear cylindrical screen only accepts the material thrown by the front cylindrical screen. With the rotation of the front screen and the cooperation of the fan airflow, the grains with high suspension speed pass through the cylindrical screen and fall into the grain feeding auger, and the light impurities with low suspension speed are blown out of the machine. The impurities such as stems and leaves are blown out of the casing by the airflow after being thrown out by the rear cylindrical screen. In this way, light impurities, short stems and stems and leaves need to be thrown out through the cylindrical screen, which increases the rated power of the cylindrical screen; and the air outlet of the fan blows the light impurities, short stems and stems and leaves out of the casing from the bottom of the cylindrical screen, and the utilization rate of the fan is not high. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a double-drum screen cleaning device and a longitudinal axial flow regenerated rice combine harvester thereof, which fully utilize the limited longitudinal space between the threshing device and the cleaning mechanism for preliminary air separation, can reduce the design power of the drum screen, and rationally utilize the fan to blow light impurities directly out of the machine without the need for throwing through the drum screen.

[0007] The present invention achieves the above technical objectives through the following technical means.

[0008] A double-cylinder screen cleaning device comprises a double-cylinder screen and a double-outlet cleaning fan, wherein the lower air outlet of the double-outlet cleaning fan is located in front of the double-cylinder screen, and is used to cooperate with the double-cylinder screen to blow large debris out of the machine; the upper air outlet of the double-outlet cleaning fan is located above the double-cylinder screen, and is used to directly blow light debris discharged by a threshing device out of the machine.

[0009] Furthermore, the lower air outlet of the double-outlet cleaning fan is divided into an upper air duct and a lower air duct by an air guide plate; the upper air duct is used to make the air flow blow above the double-cylinder screen shaft, and the lower air duct is used to make the air flow blow below the double-cylinder screen shaft.

[0010] Furthermore, the air inlet angle a of the double-outlet cleaning fan is not less than 120°, the lower air outlet angle b of the double-outlet cleaning fan is 120°~140°; and the upper air outlet angle c of the double-outlet cleaning fan is 90°~100°.

[0011] Furthermore, the double cylindrical screen comprises a front cylindrical screen and a rear cylindrical screen, the diameter of the rear cylindrical screen is 0.8-1 times the diameter of the front cylindrical screen; the rotation speed of the rear cylindrical screen is not less than the rotation speed of the front cylindrical screen.

[0012] Furthermore, the double-cylinder screen adopts a fence-type screen, and the screen gap is between 10mm and 20mm.

[0013] Furthermore, it also includes a grain slide plate and a shaking plate, which divide the grain slide plate and the shaking plate into an upper cleaning area and a lower cleaning area. The upper cleaning area is used to blow the light debris discharged by the threshing device directly out of the machine; the lower cleaning area is used to blow the large debris out of the machine.

[0014] Furthermore, a funnel-shaped seed slide plate and a shaking plate are provided between the double-cylinder screen and the threshing device; and the upper air outlet of the double-outlet cleaning fan is located above the seed slide plate.

[0015] Furthermore, one end of the grain slide plate is located below the air outlet of the cleaning fan, and the other end of the grain slide plate extends to the edge of the double-cylinder screen; the angle between the plane formed by the end edge of the grain slide plate and the axis of the double-cylinder screen shaft and the horizontal plane is greater than 45°; the angle between the grain slide plate and the horizontal plane is greater than the internal friction angle of the threshed grains.

[0016] Furthermore, the seed slide plate is provided with a guide strip for guiding the materials accumulated on both sides of the seed slide plate to the middle.

[0017] Furthermore, the guide strips are symmetrically distributed in an "eight" shape on the seed slide, and the angle between the guide strips symmetrically distributed in an "eight" shape is 40° to 80°; the guide strips symmetrically distributed in an "eight" shape divide the drop opening of the seed slide into equal widths. Since the discharge of the longitudinal axial flow threshing device drops a large amount of material in front of the cleaning chamber and is unevenly distributed laterally, showing a "high on both sides and low in the middle" pattern, the materials accumulated on both sides of the seed slide are guided to the middle by the guide strips symmetrically distributed in an "eight" shape.

[0018] Furthermore, one end of the shaking plate is located below the other end of the threshing device, and the other end of the shaking plate is located above the double-cylinder screen; a vibration mechanism is provided at one end of the shaking plate to make the shaking plate swing at an angle of 10° to 25° with the horizontal plane.

[0019] A longitudinal axial flow regenerated rice combine harvester comprises the double-cylinder screen cleaning device.

[0020] The beneficial effects of the present invention are:

[0021] 1. The double-cylinder screen cleaning device of the present invention fully utilizes the limited longitudinal space between the threshing device and the cleaning mechanism for preliminary air separation through the double-outlet cleaning fan, which can reduce the design power of the cylindrical screen and rationally utilize the fan to blow light impurities directly out of the machine without the need for throwing through the cylindrical screen.

[0022] 2. The double-cylinder screen cleaning device described in the present invention can fully utilize the respective advantages of the double-cylinder screen and the double-outlet cleaning fan in a longitudinal axial flow regenerated rice combine harvester, conform to the material characteristics of the first-season regenerated rice, and effectively improve the working effect of the regenerated rice combine harvester.

[0023] 3. The double-cylinder screen cleaning device and the double-outlet cleaning fan of the present invention can adapt to the working conditions under various feed amounts on the basis of weight reduction and vibration reduction.

[0024] 4. The double-cylinder screen cleaning device described in the present invention is divided into an upper air duct and a lower air duct by an air guide plate at the lower air outlet, and the airflow is respectively directed to the upper and lower sides of the double-cylinder screen axis, which can not only effectively improve the cleaning capacity, but also make up for the disadvantage of the limited diameter of the front cylindrical screen.

[0025] 5. In the double-drum screen cleaning device described in the present invention, the drum screen is driven by a pulley. The rotation speed of the drum screen can be changed by replacing pulleys of different diameters, and different rotation speeds of the front and rear drum screens can be coordinated to adapt to different working conditions and improve the cleaning efficiency.

[0026] 6. The double-cylinder screen cleaning device described in the present invention adopts a grid-type screen to greatly improve the screening rate of grains, which is suitable for the high grain content of regenerated rice extracts, is not easy to cause blockage, and improves the cleaning efficiency.

[0027] 7. In the double-cylinder screen cleaning device described in the present invention, the grain distribution of the product discharged from the longitudinal axial flow threshing device is such that the grain content gradually decreases from front to back, the grains in the front 2 / 3 of the casing are prone to accumulation, and the angle between the grain slide plate and the horizontal plane is greater than the internal friction angle of the rice grains, which can ensure that the grains slide smoothly into the front cylindrical screen.

[0028] 8. In the double-cylinder screen cleaning device described in the present invention, the grain distribution of the threshing device is such that the grain content gradually increases from the middle to the two sides. By providing a guide strip on the upper surface of the grain slide plate, the threshing material can be evenly dropped onto the front cylindrical screen, thereby reducing the cleaning load and improving the cleaning effect.

[0029] 9. The longitudinal axial flow regenerated rice combine harvester described in the present invention has a smaller longitudinal space between the threshing drum and the cleaning screen, and the double-outlet cleaning fan, the grain slide plate and the shaking plate divide the cleaning chamber into two upper and lower areas. The shaking plate is used in the rear half of the casing to shake the effluent to the front cylindrical screen within a limited inclination angle, reserving more longitudinal space. The gap between the shaking plate and the concave screen constitutes the air outlet. The effluent first undergoes a wind selection at the air outlet of the cleaning fan in the process of falling into the front cylindrical screen along the grain slide plate and the shaking plate, thereby the material is cleaned twice in a limited space, thereby improving the cleaning quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of a drum screen cleaning mechanism in the prior art;

[0031] Figure 2 It is a schematic diagram of the structure of the double-drum screen cleaning device of the present invention;

[0032] Figure 3 This is a schematic diagram of the inlet and outlet angles of the double-outlet cleaning fan of the present invention;

[0033] Figure 4 It is a schematic diagram of the structure of the cylindrical screen of the present invention;

[0034] Figure 5 This is a schematic diagram of the structure of the seed slide plate of the present invention;

[0035] Figure 6 A top view of the seed slide plate of the present invention;

[0036] Figure 7 It is a schematic structural diagram of the shaking board described in the present invention.

[0037] In the figure:

[0038] 1-Dual-outlet cleaning fan; 2-air guide plate; 3-cylindrical screen; 4-grain slide plate; 5-grain conveying auger; 6-shaking plate; 7-vibration mechanism; 8-concave plate screen; 301-front cylindrical screen; 302-rear cylindrical screen; 401-guide strip. DETAILED DESCRIPTION

[0039] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0040] like Figure 2 As shown, the double-cylinder screen cleaning device of the present invention includes a longitudinal axial flow threshing device, a grain conveying auger 5, a double-cylinder screen 3 and a double-outlet cleaning fan 1. The longitudinal axial flow threshing device is located above the double-cylinder screen 3, and the grain conveying auger 5 is located at the bottom of the double-cylinder screen 3; the longitudinal axial flow threshing device and the grain conveying auger 5 are existing structures and will not be described. The lower air outlet of the double-outlet cleaning fan 1 is located in front of the double-cylinder screen 3, and is used to cooperate with the double-cylinder screen 3 to blow large debris out of the machine; the upper air outlet of the double-outlet cleaning fan 1 is located above the double-cylinder screen 3, and is used to directly blow light debris discharged by the threshing device out of the machine. The double-outlet cleaning fan 1 makes full use of the limited longitudinal space between the threshing device and the cleaning mechanism for preliminary air selection, which can reduce the design power of the cylindrical screen, and reasonably use the fan to blow light debris directly out of the machine without the need for throwing through the cylindrical screen.

[0041] The lower air outlet of the double-outlet cleaning fan 1 is divided into an upper air duct and a lower air duct by an air guide plate 2; the upper air duct is used to blow the airflow to the upper side of the screen shaft of the double cylindrical screen 3, and the lower air duct is used to blow the airflow to the lower side of the screen shaft of the double cylindrical screen 3. The lower air outlet is divided into an upper air duct and a lower air duct by an air guide plate, and the airflow is directed to the upper side and the lower side of the screen shaft of the double cylindrical screen 3 respectively, which can not only effectively improve the cleaning capacity, but also make up for the disadvantage of the limited diameter of the front cylindrical screen.

[0042] The double-outlet cleaning fan 1 may be a cross-flow fan, such as Figure 2 As shown, the air inlet angle a of the double-outlet cleaning fan 1 is not less than 120°, the lower air outlet angle b of the double-outlet cleaning fan 1, that is, the center angle corresponding to the lower diffusion arc is 120°~140°; the upper air outlet angle c of the double-outlet cleaning fan 1, that is, the center angle corresponding to the upper diffusion arc is 90°~100°.

[0043] The double-cylinder screen 3 includes a front cylindrical screen 301 and a rear cylindrical screen 302. By using the double-cylinder screen and the double-outlet cleaning fan in a longitudinal axial flow regenerated rice combine harvester, the respective advantages of the two can be fully utilized, which conforms to the material characteristics of the first-season rice of regenerated rice and can effectively improve the working effect of the regenerated rice combine harvester. The rotation speeds of the front cylindrical screen 301 and the rear cylindrical screen 302 can be inconsistent. Through any drive shaft in the harvester, different belts are used to rotate to make the rotation speeds of the front cylindrical screen 301 and the rear cylindrical screen 302 inconsistent. The rotation speed of the cylindrical screen can be changed by replacing pulleys of different diameters, and different rotation speeds of the front and rear cylindrical screens can be coordinated to adapt to different working conditions and improve the cleaning efficiency; the diameter of the rear cylindrical screen 302 is 0.8-1 times the diameter of the front cylindrical screen 301; the rotation speed of the rear cylindrical screen 302 is not less than the rotation speed of the front cylindrical screen 301. Figure 3 As shown, the double cylindrical screen 3 adopts a fence-type screen with a gap of 10 mm to 20 mm, which can greatly improve the screening rate of grains, is suitable for the high grain content of regenerated rice extracts, is not easy to cause blockage, and improves the cleaning efficiency.

[0044] like Figure 2 , Figure 5 and Figure 6As shown, the seed slide plate 4 and the shaking plate 6 divide the cleaning chamber into an upper cleaning area and a lower cleaning area. The upper cleaning area is used to blow the light impurities discharged by the threshing device directly out of the machine; the lower cleaning area is used to blow the large impurities out of the machine. A seed slide plate 4 and a shaking plate 6 forming a funnel shape are provided between the double cylindrical screen 3 and the concave plate screen 8 of the threshing device; the upper air outlet of the double-outlet cleaning fan 1 is located above the seed slide plate 4. One end of the seed slide plate 4 is located below the upper air outlet of the cleaning fan 1, and the other end of the seed slide plate 4 extends to the edge of the front cylindrical screen 301; the angle between the plane formed by the end edge of the seed slide plate 4 and the axis of the screen shaft of the front cylindrical screen 301 and the horizontal plane is greater than 45°; the angle between the seed slide plate 4 and the horizontal plane is greater than the internal friction angle of the threshed grains. Since the distribution of the grains of the threshing device discharged from the longitudinal axial flow is that the grain content gradually decreases from the front to the back, the grains are prone to accumulation in the front 2 / 3 of the casing, and the angle between the grain slide plate and the horizontal plane is greater than the internal friction angle of the rice grains, which can ensure that the grains slide smoothly into the front cylindrical screen. The grain slide plate 4 is provided with a guide bar 401, which is used to guide the materials accumulated on both sides of the grain slide plate 4 to the middle. The guide bars 401 are symmetrically distributed in the shape of an "eight" on the grain slide plate 4, and the angle between the guide bars 401 symmetrically distributed in the shape of an "eight" is 40° to 80°; the guide bars 401 symmetrically distributed in the shape of an "eight" divide the blanking opening of the grain slide plate 4 into equal widths. Since the material discharged from the longitudinal axial flow drum falls in large amount in front of the cleaning chamber and is unevenly distributed laterally, showing a rule of "high on both sides and low in the middle", two guide strips 401 distributed in an "eight" shape are provided on the upper surface of the seed slide 4 to guide the materials accumulated on both sides to the middle. The two guide strips 401 are symmetrically distributed, and the angle between the two and the symmetry axis is 20° to 40°. The two guide strips 401 divide the falling part of the seed slide 4 into three areas of equal length, such as Figure 6 shown.

[0045] like Figure 2 and Figure 7 As shown, one end of the shaking plate 6 is located below the other end of the concave plate screen 8 of the threshing device, and the other end of the shaking plate 6 is located above the rear cylindrical screen 302; a vibration mechanism 7 is provided at one end of the shaking plate 6, and the vibration mechanism 7 is an eccentric vibration mechanism, which is used to make the shaking plate 6 swing at an angle of 10° to 25° with the horizontal plane.

[0046] A longitudinal axial flow regenerated rice combine harvester includes the double-cylinder screen cleaning device, wherein the longitudinal space between the threshing device and the cleaning screen is small, and the cleaning chamber is divided into two upper and lower areas by a double-outlet cleaning fan 1, a grain slide plate 4 and a shaking plate 6. The shaking plate 6 is used in the rear half of the casing to shake the effluent to the front cylindrical screen 301 within a limited inclination angle, thereby reserving more longitudinal space. The gap between the shaking plate 6 and the concave plate screen 8 constitutes an air outlet. In the process of the effluent falling into the front cylindrical screen along the grain slide plate 4 and the shaking plate 6, it first undergoes a wind selection at the air outlet of the cleaning fan, thereby the material is cleaned twice in a limited space, thereby improving the cleaning quality.

[0047] Working process:

[0048] like Figure 2 The threshed material falls on the grain slide plate 4 and the shaking plate 6 above the cleaning mechanism from the longitudinal direction of the entire threshing device. According to the characteristics of the longitudinal axial flow threshing drum, the grain content of the material removed within the first 2 / 3 of the length of the mechanism is high and unevenly distributed, and the fallen grains are easy to accumulate. The grain content of the material removed within the last 1 / 3 of the length is low and evenly distributed. The angle between the grain slide plate 4 and the horizontal plane is greater than the internal friction angle of the grain, so the material removed can slide down along the grain slide plate 4; the shaking plate 6 can be a corrugated plate by shaking at a certain frequency, pushing the material removed thereon forward, and the guide strip welded on the upper surface of the grain slide plate 4 is conducive to the material removed falling uniformly horizontally above the front cylindrical screen 301. At the same time, the airflow blown out of the air outlet on the double-outlet cleaning fan 1 will be air-selected in the process of the material removed falling to the front cylindrical screen 301, and the light impurities in the material removed will be blown out of the machine from the air outlet formed between the rear of the shaking plate 6 and the concave plate screen 8 along with the airflow. The cylindrical screen 3 adopts a fence-type screen, which effectively improves the seed penetration rate. The cylindrical screen 3 rotates at a constant speed, and smaller particles such as seeds and some fine impurities in the separated materials pass through the screen. Among them, the floating coefficient of the seeds is relatively large. After passing through the bottom of the cylindrical screen 3, they fall into the grain feeding auger 5. The floating coefficient of fine impurities is relatively small. Under the action of the airflow, the fine impurities are blown out of the cylindrical screen 3 and discharged out of the machine. The large impurities such as short stems and leaves that do not pass through the sieve holes are thrown to the rear by the front cylindrical screen 301 and the rear cylindrical screen 302, and are blown out of the machine through the impurity outlet with the cooperation of the airflow.

[0049] The embodiments are preferred implementations of the present invention, but the present invention is not limited to the above-mentioned implementations. Any obvious improvements, substitutions or modifications that can be made by those skilled in the art without departing from the essential content of the present invention belong to the protection scope of the present invention.

Claims

1. A double drum screen cleaning device, characterized in that: It comprises a double cylindrical screen (3), a seed slide plate (4), a shaking plate (6) and a double-outlet cleaning fan (1), wherein the lower air outlet of the double-outlet cleaning fan (1) is located in front of the double cylindrical screen (3) and is used to cooperate with the double cylindrical screen (3) to blow large impurities out of the machine; the upper air outlet of the double-outlet cleaning fan (1) is located above the double cylindrical screen (3) and is used to directly blow light impurities discharged by the threshing device out of the machine; The seed slide plate (4) and the shaking plate (6) divide the cleaning chamber into an upper cleaning area and a lower cleaning area. The upper air outlet is connected to the upper cleaning area and is used to blow light debris discharged by the threshing device directly out of the machine. The lower air outlet is connected to the lower cleaning area and is used to blow large debris out of the machine. A funnel-shaped seed slide plate (4) and a shaking plate (6) are provided between the double cylindrical screen (3) and the threshing device; the upper air outlet of the double-outlet cleaning fan (1) is located above the seed slide plate (4); one end of the seed slide plate (4) is located below the upper air outlet of the cleaning fan (1), and the other end of the seed slide plate (4) extends to the edge of the double cylindrical screen (3); one end of the shaking plate (6) is located below the other end of the threshing device, and the other end of the shaking plate (6) is located above the double cylindrical screen (3); The lower air outlet of the double-outlet cleaning fan (1) is divided into an upper air duct and a lower air duct by an air guide plate (2); the upper air duct is used to make the air flow blow toward the upper side of the screen shaft of the double-cylinder screen (3), and the lower air duct is used to make the air flow blow toward the lower side of the screen shaft of the double-cylinder screen (3); The air inlet angle a of the double-outlet cleaning fan (1) is not less than 120°, the lower air outlet angle b of the double-outlet cleaning fan (1) is 120°~140°; and the upper air outlet angle c of the double-outlet cleaning fan (1) is 90°~100°.

2. The double drum screen cleaning device according to claim 1, characterized in that: The double cylindrical screen (3) comprises a front cylindrical screen (301) and a rear cylindrical screen (302); the diameter of the rear cylindrical screen (302) is 0.8 to 1 times the diameter of the front cylindrical screen (301); and the rotation speed of the rear cylindrical screen (302) is not less than the rotation speed of the front cylindrical screen (301).

3. The double drum screen cleaning device according to claim 1, characterized in that: The double cylindrical screen (3) adopts a fence-type screen, and the screen gap is between 10 mm and 20 mm.

4. The double drum screen cleaning device according to claim 1, characterized in that: The angle between the plane formed by the end edge of the seed slide plate (4) and the axis of the screen shaft of the double cylindrical screen (3) and the horizontal plane is greater than 45°; and the angle between the seed slide plate (4) and the horizontal plane is greater than the internal friction angle of the threshed seed.

5. The double drum screen cleaning device according to claim 1, characterized in that: The seed slide plate (4) is provided with a guide strip (401) for guiding materials accumulated on both sides of the seed slide plate (4) toward the middle.

6. The double drum screen cleaning device according to claim 5, characterized in that: The guide strips (401) are symmetrically distributed in an "eight" shape on the seed slide plate (4), and the included angles between the guide strips (401) symmetrically distributed in the "eight" shape are 40° to 80°; the guide strips (401) symmetrically distributed in the "eight" shape divide the blanking opening of the seed slide plate (4) into equal widths.

7. The double drum screen cleaning device according to claim 1, characterized in that: A vibration mechanism (7) is provided at one end of the shaking plate (6) for causing the shaking plate (6) to swing at an angle between 10° and 25° with respect to the horizontal plane.

8. A longitudinal axial flow regenerated rice combine harvester, characterized in that: The invention comprises a double-drum screen cleaning device as described in any one of claims 1 to 7.

Images