WO2020029348A1

WO2020029348A1 - High-speed centrifugal threshing apparatus of grain combine harvester

Info

Publication number: WO2020029348A1
Application number: PCT/CN2018/103397
Authority: WO
Inventors: 唐忠; 张浩天; 周跃鹏; 李宇
Original assignee: 江苏大学
Priority date: 2018-08-09
Filing date: 2018-08-31
Publication date: 2020-02-13
Also published as: CN109156174A; CN109156174B

Abstract

A high-speed centrifugal threshing apparatus of a grain combine harvester, comprising a stator drum (1), a rotary concave plate sieve (2), a power input gear set (3), a transmission gear set (4), and a straw crushing apparatus (5); the rotary concave plate sieve (2) comprises a concave plate sieve (202) and an external toothed top cover (201), the external toothed top cover being fixedly mounted respectively on both ends of the concave plate sieve (202); the power input gear set (3) is positioned at one end of the concave plate sieve (202), and the power input gear set (3) engages with an external toothed top cover gear pair to make the rotary concave plate sieve (2) rotate; an input end of the transmission gear set (4) engages with the external toothed top cover gear pair, and an output end of the transmission gear set (4) is connected to the straw crushing apparatus (5); and the straw crushing apparatus (5) is positioned on the other end of the concave plate sieve (202). The centrifugal threshing apparatus integrates a threshing and straw crushing apparatus, effectively optimising the drum structure; the entire apparatus uses geared transmission, so that, compared to a traditional belt transmission structure, the threshing apparatus has a more stable rotation speed, the structure is more compact, the working performance is more reliable, and the working life is extended.

Description

High-speed centrifugal threshing device for grain combine

Technical field

The invention relates to the technical field of grain threshing and separating devices on a combine harvester, in particular to a high-speed centrifugal threshing device of a grain combine.

Background technique

The vertical axial flow threshing and separating device is an important part of the combine harvester. When the combine is working in the field, it will feed the harvested grain into the threshing drum for threshing and separation. The performance parameters such as the depuration rate and the breakage rate are directly good. Affects the quality of the combine harvester. Compared with the cutting drum, it has longer threshing time, higher depuration rate and better threshing and separation performance. When it is arranged along the longitudinal direction of the machine, it is not limited by the size of the combined harvester. Therefore, it is more and more widely used in On the harvester.

At present, the devices and methods for the threshing and separation of longitudinal axial flow grain on a combine harvester mainly include: Chinese patent CN201520994619.9 has invented a longitudinal axial flow differential threshing roller, which is connected by two differential threshing rollers before and after. The drum rotates at a low speed and the rear threshing drum rotates at a high speed, which can effectively solve the problem of high yield rice and difficult to remove varieties. Chinese patent CN201520994798.6 invented an anti-blocking kneading type threshing drum device. By setting a kneading plate device and a swinging hammer device, the bar material is a kneading type when the grain is threshed, which can reduce the impact on the grain under the action of the centrifugal force of the threshing drum. Damage to improve threshing quality; Chinese patent CN201610656061.2 invented a longitudinal axial flow threshing and separating device with a forced feeding device, by combining the longitudinal axial flow threshing and separating device with the function of threshing and separating materials and the forced feeding device Two for one, the grasping capacity of the longitudinal axial flow threshing and separating device is increased, the working efficiency of the longitudinal axial flow threshing and separating device is improved, the removal rate of the longitudinal axial flow threshing and separating device is improved, and the loss rate is reduced.

The above inventions all realize the optimization of the structure of the longitudinal axial flow threshing device, but the existing longitudinal axial flow threshing drum still has a large centrifugal force when it rotates at high speed, and the speed is unstable, so that the material stalk is in the drum and the threshing teeth. The collision between the rods is greater than the impact force required for the threshing and separation, and the stem is severely broken, which results in an increase in the power consumption of the threshing drum, a poor threshing and separation effect, and an increased burden on the cleaning device.

Summary of the invention

For the existing axial combine threshing drum of the existing grain combiner, during the threshing process, the stem was hit by a high-speed rotating threshing rack, and the damage rate was high, resulting in a poor separation effect of the combine and intensifying the machine. The phenomenon of energy consumption, the present invention provides a high-speed centrifugal threshing device for a grain combine, which integrates threshing and weeding devices, and removes parts such as cover plates, which effectively optimizes the structure of the drum. At the same time, the entire device uses gears Compared with the traditional belt drive structure, the transmission makes the thresher speed more stable, the structure is more compact, the working performance is reliable, and the working life is extended.

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

A high-speed centrifugal threshing device for a grain combine includes a rotary concave plate screen, a power input gear set, a transmission gear group, and a grass crushing device. The rotary concave plate screen includes a concave plate screen and an external tooth top cover. The two ends of the concave plate screen are fixed with external tooth top covers, respectively; the power input gear set is located at one end of the concave plate screen, and the power input gear set is meshed with the external tooth top cover gear pair to make the rotary concave plate The sieve rotates; the input end of the transmission gear set meshes with the outer-tooth top cover gear pair, and the output end of the transmission gear set is connected to the grass crushing device; the grass crushing device is located at the other end of the concave plate screen.

Further, the power input gear set includes a power input gear box, a transmission shaft A, and a first helical gear; the power input gear box is provided with two parallel output ends, each of which is connected to the transmission shaft A, each Two first helical gears are installed on each of the transmission shafts A, and the first helical gears are meshed with the external tooth top cover.

Further, the grass-breaking device includes a second bevel gear, a grass-breaking blade mounting shaft, a grass-breaking blade, and a blade holder; the blade holders are evenly distributed on the grass-breaking blade installation shaft, and the grass-breaking blade is installed on the blade holder A second bevel gear is provided at each end of the grass cutter mounting shaft; any one of the second bevel gears is connected to the transmission gear set;

The transmission gear set includes a transmission shaft B, a first bevel gear and a second helical gear; a first bevel gear is fixed at one end of the transmission shaft B, a second helical gear is mounted on the transmission shaft B, and the second helical gear One-to-one correspondence with the external tooth top cover, the second helical gear meshes with the external tooth top cover; the first bevel gear meshes with the second bevel gear.

Further, it further includes a stator drum; the stator drum includes a threshing rack mounting shaft, a threshing rack, and a central shaft fixing seat; the threshing rack mounting shaft passes through the rotary concave plate screen, and the threshing rack is installed Both ends of the shaft are supported by the central shaft fixing seat; the threshing toothed rod installation shaft is installed with a plurality of threshing toothed rods which are uniformly distributed in the axial direction and the radial direction, and the axially adjacent threshing toothed rods are staggered and distributed.

Further, the threshing rack includes a threshing rack A and a threshing rack B, the threshing rack A is composed of a plurality of radial threshing racks uniformly distributed, and the threshing rack B is composed of several radial racks The threshing rack is uniformly distributed; the threshing rack A and the threshing rack B are axially distributed on the threshing rack mounting shaft, and the threshing rack and the adjacent threshing rack are in the threshing rack The included angle of the threshing racks of group B is 30-45 °; the arrangement spacing between the threshing racks of group B is twice the arrangement spacing of the threshing racks of group A.

Further, the threshing racks of the threshing rack A and the threshing racks of the threshing rack B are cylindrical rods with the same diameter and length; the distance between the adjacent threshing racks A is 135 145 mm to 145 mm, and the distance between adjacent groups of the threshing racks B is 270 to 290 mm.

Further, a guide bar is further included; the guide bars are evenly distributed on the inner wall of the outer tooth top cover and the concave plate screen.

Further, several pairs of guide bars are welded on the inner wall of the concave plate screen at equal intervals.

Further, the deflector strip is a semi-circular strip-shaped thin plate; the arrangement direction of the deflector strip and the radial direction of the concave plate screen present an angle of 10 ° to 15 °, and the distance between adjacent deflector strips is adjacent to The spacing between the threshing racks A is the same.

Further, the height of the grass cutters is increased from the two sides to the center in order, and the interval between the grass cutters is 80-100 mm.

The beneficial effects of the present invention are:

1. The high-speed centrifugal threshing device of the grain combine harvester according to the present invention, the entire transmission system is composed of gear transmission, and the power is transmitted from the gear box to the transmission shaft A, and then the transmission shaft A is transmitted to the rotary concave plate screen, and The rotary concave plate screen drives the transmission shaft B to rotate, and the transmission shaft B then drives the grass crushing device to rotate. The gear transmission makes the rotation speed of each component stable, and effectively reduces the loss in power transmission and improves the transmission efficiency.

2. Compared with the traditional threshing drum, the high-speed centrifugal threshing device of the grain combine harvester according to the present invention omits components such as spokes, spokes, feeding heads, positioning plates, etc. The structure of the drum is greatly simplified and the internal space is increased. This makes the movement of the material in the threshing device smoother and effectively solves the problem that the material is easily entangled on the spokes, spokes, and threshing gear.

3. The high-speed centrifugal threshing device of the grain combine harvester according to the present invention, the rotary concave plate sieve rotates at high speed during work. Compared with the traditional working mode of rotating the rotary plate and fixed concave plate sieve, the quality of the concave plate sieve is more high. It is small, and the eccentric moment due to assembly errors and other problems during high-speed rotation is smaller, which is beneficial to reduce the vibration of the threshing device and make its work more stable.

4. The high-speed centrifugal threshing device of the grain combine harvester of the present invention works by rotating the concave plate sieve at a high speed and the drum is fixed. After the material enters the threshing device, it will abut the inner wall of the concave plate sieve due to the centrifugal force. Throwing of the threshing rack, the material moves along the guide bar, which avoids the problem that the stem is broken due to excessive hitting by the threshing rack and the grain leaks from the concave plate sieve together with the grain, which improves the threshing and separation ability It also reduces the power consumption caused by excessive collision between the threshing rack and the stem.

5. The high-speed centrifugal threshing device of the grain combine harvester according to the present invention, the grass crushing device is arranged at the grass discharge opening of the rotary concave plate screen, and simultaneously driven by the rotary concave plate screen, the threshing device and the grass crushing device are realized The integration can make the structure on the combine closer, which is beneficial to the structure optimization of the combine.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view of a high-speed centrifugal threshing device of a grain combine according to the present invention.

FIG. 2 is a top view of a high-speed centrifugal threshing device of a grain combine harvester according to the present invention.

FIG. 3 is an assembly drawing of a stator roller according to the present invention.

FIG. 4 is an assembly structure diagram of a stator roller and a rotary concave plate screen according to the present invention.

Fig. 5 is a sectional view of the interior of the rotary concave plate screen according to the present invention.

FIG. 6 is a schematic diagram of a guide bar distribution according to the present invention.

FIG. 7 is an assembly drawing of a transmission shaft system according to the present invention.

FIG. 8 is a schematic diagram of a transmission according to the present invention.

FIG. 9 is an assembly diagram of the grass crushing device according to the present invention.

In the picture:

1-Stator drum; 101-Thresher rack shaft; 102-Thresher rack A group; 103-Thresher rack B group; 104-Central shaft fixed seat; 2-Rotary concave plate screen; 201-External gear top cover ; 202--Concave sieve; 203-Deflector; 3-Power input gear set; 301-Power input gear box; 302-Drive shaft A; 303-Drive shaft A support; 304-First helical gear; 4 -Transmission gear set; 401- Transmission shaft B; 402- Transmission shaft B support; 403- first bevel gear; 404- second helical gear; 5- grass breaking device; 501- second bevel gear; 502- broken grass Knife mounting shaft; 503-grass cutter; 504-knife holder; 505-install shaft support base.

detailed description

The present invention is further described below with reference to the drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

As shown in FIG. 1 and FIG. 2, the high-speed centrifugal threshing device of the grain combine harvester according to the present invention includes a stator drum 1, a rotary concave plate screen 2, a power input gear set 3, a transmission gear set 4, and a grass breaking device 5 . The stator drum 1 penetrates into the rotary concave plate screen 2 and is installed coaxially with the rotary concave plate screen 2; the power input gear set 3 includes a power input gear box 301, a transmission shaft A302, and a first helical gear 304 The power input gear box 301 is provided with two parallel output ends, each of which is connected to a drive shaft A302, and each of the drive shaft A302 is equipped with two first helical gears 304, and the first bevel The gear 304 meshes with the external tooth top cover 201. As shown in the figure, the power input gear set 3 is located on the upper and lower sides of the rotary concave plate screen 2, and the first helical gear 304 is engaged with the external tooth top cover 201;

The grass cutting device 5 includes a second bevel gear 501, a grass cutting blade mounting shaft 502, a grass cutting blade 503, and a blade holder 504; the blade seating 504 is evenly distributed on the grass cutting blade mounting shaft 502, and the blade holder A grass cutter 503 is installed on 504; two ends of the grass cutter mounting shaft 502 are provided with second bevel gears 501; any one of the second bevel gears 501 is connected to the transmission gear set 4; the transmission gear set 4 includes a transmission shaft B401, a first bevel gear 403, and a second helical gear 404; one end of the transmission shaft B401 is fixed with a first bevel gear 403, and a second helical gear 404 is installed on the transmission shaft B401, and the second helical gear 404 corresponds to the external tooth top cover 201 one by one, the second helical gear 404 meshes with the external tooth top cover 201, and the first bevel gear 403 meshes with the second bevel gear 501. The transmission gear set 4 is located on the left and right sides of the rotary concave plate screen 2. The second helical gear 404 is engaged with the external tooth top cover 201. The grass crushing device 5 is located on the discharge side and the axis of the rotary concave plate screen 2. On the same horizontal plane, its second bevel gear 501 meshes with the first bevel gear 403 in the transmission gear set 4.

As shown in FIG. 3, the stator drum 1 mainly includes a threshing rack bar mounting shaft 101, a threshing rack bar A group 102, a threshing rack bar B group 103, and a central shaft fixing seat 104; the threshing rack bar mounting shaft 101 passes through In the rotary concave plate sieve 2, both ends of the threshing rack mounting shaft 101 are supported by the central shaft fixing base 104; the threshing rack A group 102 is composed of a plurality of threshing racks that are evenly distributed in the radial direction, The threshing rack B group 103 is composed of a plurality of threshing racks that are evenly distributed radially; the threshing rack A group 102 and the threshing rack B group 103 are axially distributed on the threshing rack mounting shaft 101, and the threshing The included angle between the threshing rack of the rack A group 102 and the threshing rack of the adjacent threshing rack B group 103 is 30-45 °; the arrangement interval between the threshing rack B group 103 is the threshing rack A group 102 Double the spacing between them. The threshing racks of the threshing rack A group 102 and the threshing racks of the threshing rack B group 103 are cylindrical rods with the same diameter and length; the distance between the adjacent threshing racks A group 102 is 135 to 145 mm, and the distance between the adjacent threshing rack B group (103) is 270 to 290 mm. The threshing rack mounting shaft 101 has a length of 1750 to 1800 mm and a diameter of 50 to 70 mm. The threshing rack A 102 and the threshing rack B 103 are each composed of 4 radial threshing racks. On the threshing rack mounting shaft 101, 11 to 12 threshing racks are uniformly arranged, and on the threshing

rack mounting shaft

101, 5 to 6 threshing racks are uniformly arranged.

As shown in FIG. 4, the rotary concave plate screen 2 includes an external tooth top cover 201, a concave plate screen 202, and a guide bar 203; the external tooth top cover 201 is located at two ends of the concave plate screen 202 and is connected with the concave The plate screen 202 is installed coaxially; the guide bars 203 are evenly distributed on the inner wall of the external tooth top cover 201; the thickness of the external tooth top cover 201 is 30 to 40 mm, the inner diameter is 700 to 720 mm, and the outer diameter is 740. ～ 750mm; the concave plate screen 202 has a diameter of 700-720mm and a length of 1350-1400mm. It is composed of two upper and lower semicircular mesh screens, which are connected by bolts as a whole, and are welded in the middle of the two external tooth caps 201 The external gear of the external tooth top cover 201 rotates to the left.

As shown in FIG. 5 and FIG. 6, 6 to 8 pairs of guide bars 203 are uniformly welded on the inner wall of the concave plate screen 202, the directions of the guide bars 203 are parallel, and the guide bars 203 are staggered on the concave plate screen 202. The guide strips 203 are semi-circular, with a thickness of 2-3 mm and a height of 20-25 mm; the arrangement direction of the guide strips 203 and the concave screen 202 are at an angle of 10 ° to 15 ° in the radial direction. The interval between the deflector bars 203 is the same as the interval between the adjacent threshing rack A group 102.

As shown in FIGS. 7 and 8, the entire transmission shaft system includes a power input gear set 3 and a transmission gear set 4. The power input gear set 3 includes a power input gear box 301, a transmission shaft A302, a transmission shaft A support base 303, and a first helical gear 304. The transmission shaft A302 is provided in two and symmetrically moves up and down from the power input gear box 301. The drive shaft A support base 303 is provided in four, and is respectively sleeved at two ends of two drive shafts A302; the first helical gear 304 is provided in four, and each drive shaft A302 is provided with two Is fixed directly above and directly below the rotary concave plate screen 2 and meshes with the two external tooth top covers 201. The first helical gear 304 rotates to the right; the second helical gear 404 rotates to the right;

The transmission gear set 4 mainly includes a transmission shaft B401, a transmission shaft B support base 402, a first bevel gear 403, and a second helical gear 404; the transmission shaft B401 is provided in two, and is respectively located on the two sides of the rotary concave plate screen 2 The transmission shaft B support base 402 is provided in four, and is respectively sleeved at two ends of the two transmission shafts B401; the second helical gear 404 is provided in four, and each transmission shaft B401 is provided with two, fixed The two sides of the rotary concave plate screen 2 mesh with the two external tooth top covers 201; the first bevel gears 403 are provided in two, and are respectively installed at the tail ends of the two transmission shafts B401 and in the grass breaking device 5. The second bevel gear 501 meshes.

The power input gear box 301 is used to transmit the power of the engine to the entire threshing device. Because the engine speed of the grain combine is constant, in order to control the speed of the high-speed centrifugal threshing device within the optimal working speed range, the power input gear box 301 The internal transmission ratio is 1: 2 to 1: 2.5. The helical gear 304 rotates with the transmission shaft A302, and transmits the power transmitted by the power input gear box 301 to the rotary concave plate screen 2 to make it rotate at high speed. The transmission ratio between the helical gear 304 and the rotary concave plate screen 2 is 4: 1 to 5: 1, and the rotary concave plate screen 2 will transmit power to the transmission gear set 4 through meshing with the second helical gear 404. The rotary type The transmission ratio between the concave plate screen 2 and the second helical gear 404 is 1: 4 to 1: 5. The first bevel gear 403 transmits power to the second bevel gear 501, which drives the grass breaking device 5 to rotate at high speed. The transmission ratio between the bevel gear 403 and the second bevel gear 501 is 1.5: 1 to 2: 1. The transmission shaft A302 has a length of 2000 to 2050 mm and a diameter of 30 to 40 mm, and the transmission shaft B401 has a length of 1750 to 1800 mm and a diameter of 30 to 40 mm.

As shown in FIG. 9, the grass cutting device 5 includes a second bevel gear 501, a grass cutting blade mounting shaft 502, a grass cutting blade 503, a knife holder 504, and a mounting shaft support seat 505; The mounting shaft 502 is uniformly welded in four rows along the circumferential direction, and there are bolt holes on both sides of the knife seat 504, and the inside is hollow; the grass cutter 503 has bolt through holes below the side, and is fixed to the hollow place inside the knife seat 504 by bolts; The second bevel gear 501 is mounted on both ends of the grass cutter mounting shaft 502; the mounting shaft support 505 is mounted on the inside of the second bevel gear 501 on the grass cutter mounting shaft 502. The first bevel gear 403 and the second bevel gear 501 are spur bevel gears. The length of the grass cutter mounting shaft 502 is 870 to 900 mm and the diameter is 30 to 40 mm. The blade holder 504 is welded symmetrically from the center of the grass cutter mounting shaft 502 to both sides into 4 rows, 6 in each row, and each row of knives. The included angle between the seat 504 and the adjacent row is 90 °; the grass cutter 503 is fastened to the knife seat 504 by means of bolt connection. The height of the grass cutter 503 is 80-320 mm, and the height from the sides to the center is increased by 90 to 110 mm. The thickness of the grass cutter 503 is 3 to 5 mm, and the distance between the grass cutters is 80 to 100 mm.

The specific implementation process is: the stator drum 1 is fixed, the power input gear set 3 drives the rotary concave plate screen 2 to rotate at high speed, and the rotary concave plate screen 2 transmits power to the grass cutting device 5 through the transmission gear group 4 5 also starts high-speed rotation. The material enters the gap between the rotary concave plate sieve 2 and the stator roller 1 from the feeding end along the guide bar 203, and close to the inner wall of the rotary concave plate sieve 2 due to the centrifugal force. The threshing rack A 102 and the threshing rack In group B 103, the animal feed stalks are continuously moved along the guide bar 203, and the grains fall from the gap on the rotary concave plate screen 2 to complete the threshing and separation process. Finally, after the stem moves to the discharge port, the grass crushing device 5 cuts the stem to complete the entire work process.

The embodiment is a preferred implementation of the present invention, but the present invention is not limited to the above-mentioned embodiments. Without departing from the essence of the present invention, any obvious improvement, replacement, or Variations belong to the protection scope of the present invention.

Claims

A high-speed centrifugal threshing device for a grain combine is characterized by comprising a rotary concave plate screen (2), a power input gear set (3), a transmission gear set (4), and a grass breaking device (5); the rotation Type concave plate screen (2) includes a concave plate screen (202) and an external tooth top cover (201), and the two ends of the concave plate screen (202) are fixedly installed with an external tooth top cover (201); the power input gear set (3) is located at one end of the concave plate screen (202), and the power input gear set (3) is meshed with the gear pair of the external tooth top cover (201) for rotating the rotary concave plate screen (2); The input end of the transmission gear set (4) is meshed with the gear pair of the external tooth top cover (201), and the output end of the transmission gear set (4) is connected to the grass breaking device (5); the grass breaking device ( 5) Located at the other end of the concave screen (202).
The high-speed centrifugal threshing device of the grain combine according to claim 1, wherein the power input gear set (3) comprises a power input gear box (301), a transmission shaft A (302), and a first helical gear ( 304); the power input gearbox (301) is provided with two parallel output ends, each of the output ends is connected to a transmission shaft A (302), and two transmission shafts (302) are installed on each of the transmission shafts A (302). A helical gear (304), the first helical gear (304) is meshed with the external tooth top cover (201).
The high-speed centrifugal threshing device of the cereal combine harvester according to claim 1, wherein the grass cutting device (5) comprises a second bevel gear (501), a grass cutting blade mounting shaft (502), and a grass cutting blade ( 503) and knife seat (504); the knife seat (504) is evenly distributed on the installation shaft (502) of the grass cutter, and the grass knife (503) is installed on the knife seat (504); A second bevel gear (501) is provided at each end of the knife mounting shaft (502); any one of the second bevel gears (501) is connected to the transmission gear set (4);

The transmission gear set (4) includes a transmission shaft B (401), a first bevel gear (403), and a second helical gear (404); one end of the transmission shaft B (401) is fixed with a first bevel gear (403), A second helical gear (404) is installed on the transmission shaft B (401). The second helical gear (404) corresponds to the external tooth top cover (201), and the second helical gear (404) is The tooth top cover (201) is meshed; the first bevel gear (403) is meshed with the second bevel gear (501).
The high-speed centrifugal threshing device for a grain combine according to claim 1, further comprising a stator drum (1); the stator drum (1) comprising a threshing rack mounting shaft (101), a threshing rack and a center A shaft fixing seat (104); the threshing rack mounting shaft (101) passes through the rotary concave plate screen (2), and both ends of the threshing rack mounting shaft (101) pass through the central shaft fixing seat ( 104) Support; a plurality of threshing tooth bars uniformly distributed in the axial direction and the radial direction are installed on the threshing tooth bar mounting shaft (101), and axially adjacent threshing tooth bars are staggered and distributed.
The high-speed centrifugal threshing device for a grain combine according to claim 4, wherein the threshing rack comprises a threshing rack A (102) and a threshing rack B (103), and the threshing rack A The group (102) is composed of a plurality of threshing racks that are uniformly distributed in the radial direction, and the group B (103) of the threshing racks is composed of a plurality of threshing racks that are uniformly distributed in the radial direction; the group A (102) of the threshing racks and the threshing The rack B group (103) is axially distributed on the threshing rack mounting shaft (101), and the threshing rack of the threshing rack A (102) and the threshing tooth of the adjacent rack B (103) The included angle of the bar is 30 to 45 °; the arrangement interval between the threshing racks B (103) is twice the arrangement gap between the threshing racks A (102).
The high-speed centrifugal threshing device of the grain combine harvester according to claim 5, wherein the threshing racks of the threshing rack A (102) and the threshing racks of the threshing rack B (103) are cylindrical. The shape is rod-shaped, and the diameter and length are equal; the distance between the adjacent threshing rack A (102) is 135-145mm, and the distance between the adjacent threshing rack B (103) is 270-290mm.
The high-speed centrifugal threshing device for a grain combine according to any one of claims 1-6, further comprising a guide bar (203); the guide bars (203) are all distributed on the outer tooth top cover ( 201) and concave wall screen (202).
The high-speed centrifugal threshing device of the grain combine according to claim 7, characterized in that a plurality of pairs of guide bars (203) are welded on the inner wall of the concave screen (202) at equal intervals.
The high-speed centrifugal threshing device for a grain combine according to claim 8, characterized in that the guide bar (203) is a semi-circular strip-shaped thin plate; the arrangement direction of the guide bar (203) and the concave plate screen (202) An included angle of 10 ° to 15 ° is present in the radial direction, and the interval between the adjacent deflector bars (203) is the same as the interval between the adjacent threshing rack A group (102).
The high-speed centrifugal threshing device for a grain combine harvester according to any one of claims 1-6, characterized in that the height of the grass cutter (503) increases from both sides to the center in order, and between the grass cutter (503) The spacing is 80-100mm.