阅读说明：本技术 一种对置螺旋式秸秆归行的小麦免耕播种机防堵装置 (Stifled device is prevented to wheat no-tillage seeder that spiral straw of opposition was returned line ) 是由 卢彩云 李云祥 李洪文 何进 王庆杰 位旭阳 黄圣海 高振 袁盼盼 王英博 于 2021-09-13 设计创作，主要内容包括：本发明属于农业机械领域,特别涉及一种对置螺旋式秸秆归行的小麦免耕播种机防堵装置,所述免耕播种机的下方由前至后布置有旋耕刀(4)、驱动机构、对置螺旋式秸秆拨送机构(1)、秸秆归行防堵机构(2)和开沟器(3)；对置螺旋式秸秆拨送机构(1)包括叶片轴(603)、对置双螺旋叶片组(301)、机架(302)、轴承(303)和支撑座(304)；所述秸秆归行防堵机构(2)包括n个秸秆归行防堵单体(401),所述n≥1；该装置有效降低播种机和开沟器的壅堵情况,提高作业稳定性和沟深一致性；可以有效清理播种带上的秸秆,实现田间秸秆有序归行,可以降低晾籽率,提高免耕播种质量,有利于作物增产。(The invention belongs to the field of agricultural machinery, and particularly relates to an anti-blocking device of a wheat no-tillage planter with opposite spiral straw rows, wherein a rotary blade (4), a driving mechanism, an opposite spiral straw pushing mechanism (1), a straw row-returning anti-blocking mechanism (2) and a furrow opener (3) are arranged below the no-tillage planter from front to back; the opposite spiral type straw pushing and conveying mechanism (1) comprises a blade shaft (603), an opposite double-spiral blade group (301), a rack (302), a bearing (303) and a supporting seat (304); the straw returning and anti-blocking mechanism (2) comprises n straw returning and anti-blocking monomers (401), wherein n is more than or equal to 1; the device effectively reduces the blocking condition of the seeder and the furrow opener, and improves the operation stability and the furrow depth consistency; the straw on the seeding belt can be effectively cleaned, the field straw is orderly arranged, the seed airing rate can be reduced, the no-tillage seeding quality is improved, and the yield of crops is increased.)

1. The utility model provides a stifled device is prevented to wheat no-tillage seeder that spiral straw was returned to line of opposition, no-tillage seeder's below has arranged rotary blade (4) and furrow opener (3) by preceding to the back, its characterized in that: the anti-blocking device comprises: the straw pushing and conveying device comprises a driving mechanism, an opposite spiral type straw pushing and conveying mechanism (1) and a straw returning and anti-blocking mechanism (2); wherein the content of the first and second substances,

the opposite spiral straw pushing and conveying mechanism (1) is arranged right behind the rotary tillage cutter (4) and is connected with a no-tillage planter through a rack (302); the straw returning and anti-blocking mechanism (2) is arranged right in front of the furrow opener (3) and is positioned behind the opposite spiral straw poking and conveying mechanism (1);

the opposite spiral type straw pushing and conveying mechanism (1) comprises a blade shaft (603), an opposite double-spiral blade group (301), a rack (302), a bearing (303) and a supporting seat (304); wherein the content of the first and second substances,

the blade shaft (603) is supported on the frame (302) through a bearing (303) and a supporting seat (304), and the blade shaft (603) is driven by a driving mechanism to rotate;

the opposed double-spiral blade group (301) comprises n opposed double-spiral blade single bodies (6), the distance between every two adjacent double-spiral blade single bodies (6) is the same, and the arrangement angles between every two adjacent double-spiral blade single bodies (6) have the same angle difference; the angle difference theta of the arrangement angles between two adjacent double-spiral blade monomers (6) is 360 DEG/n, and n is more than or equal to 1; the opposed double-helical blade single bodies (6) of the opposed helical straw poking and conveying mechanism (1) can convey straws to two sides of the opposed double-helical blade single bodies (6);

the position of each opposite double-spiral blade single body (6) corresponds to one sowing belt, and the gap part between two adjacent opposite double-spiral blade single bodies (6) corresponds to a non-sowing area between the two sowing belts;

the opposed double-spiral blade single bodies (6) comprise blades (602) and blade cutting edges (604), wherein each opposed double-spiral blade single body (6) comprises two groups of blades (602) which are opposed relative to a symmetrical center point on a blade shaft (603), wherein the first group of blades (602) comprises a first spiral blade (607) and a second spiral blade (608), and the second group of blades (602) comprises a third spiral blade (609) and a fourth spiral blade (610); the first helical blade (607) and the second helical blade (608) are opposite to a plane which is perpendicular to the blade shaft (203) and passes through the blade cusp (606) and the symmetrical center points of the first helical blade (607) and the second helical blade (608) on the blade shaft (603); the third helical blade (609) and the fourth helical blade (610) are opposite to a plane which is perpendicular to the blade shaft (203) and passes through the blade sharp point (606) and the symmetrical center points of the third helical blade (609) and the fourth helical blade (610) on the blade shaft (603);

the bottom of the blade (602) is fixed on the blade shaft (603), and the top of the blade (602) is provided with a blade edge (604) with an edge curve (605);

the point where the first spiral blade (607) and the second spiral blade (608) gradually get close and are connected with the top cutting edge curve (605) is the blade sharp point (606) of the first spiral blade (607) and the second spiral blade (608); the point where the third helical blade (609) and the fourth helical blade (610) gradually get close along with the top cutting edge curve (605) and are connected is the blade tip point (606) of the third helical blade (609) and the fourth helical blade (610);

the curved surface shape of the blade (602) is determined by an edge curve (605);

the straw returning and anti-blocking mechanism (2) comprises n straw returning and anti-blocking monomers (401), wherein n is more than or equal to 1; the opposite double-spiral blade single bodies (6) correspond to the straw returning anti-blocking single bodies (401) in the front-back direction one by one;

the position of each group of straw row-returning anti-blocking monomers (401) corresponds to one sowing belt, and the gap part between two adjacent straw row-returning anti-blocking monomers (401) corresponds to a non-sowing area between two sowing belts;

one end of the triangular bracket (804) is connected with the baffle (802), and the other end is connected with the no-tillage planter; the straw row-returning anti-blocking monomer (401) is connected with the no-tillage planter through a baffle (802) and a triangular bracket (804); the baffle (802) and the flow guide anti-blocking plate (803) are integrally formed, and the flow guide anti-blocking plate (803) is positioned at the rear side part of the baffle (802); the material containing groove (801) is positioned at the lower part of the baffle (802), and the material containing groove (801) is connected with the baffle (802) and the flow guide anti-blocking plate (803); the material containing groove (801) corresponds to the blade (602) of the double-helix blade single body (6) which is arranged in front of the material containing groove, and the blade (602) can rotate to pass through the upper surface of the material containing groove (801) and is at a certain distance from the upper surface of the material containing groove (801).

2. The anti-clogging device of an opposed spiral straw row wheat no-tillage planter as claimed in claim 1, wherein: the driving mechanism is driven by a tractor rear output shaft after speed change or is driven by a hydraulic motor independently.

3. The anti-clogging device of an opposed spiral straw row wheat no-tillage planter as claimed in claim 1, wherein: the opposed double-spiral blade group (301) comprises a first-stage opposed double-spiral monomer (501), a second-stage opposed double-spiral monomer (502) and a third-stage opposed double-spiral monomer (503) from inside to outside, and the first-stage opposed double-spiral monomer (501), the second-stage opposed double-spiral monomer (502) and the third-stage opposed double-spiral monomer (503) are opposed double-spiral blade monomers (6) and have the same structure;

in each group of the first-stage opposite double-spiral monomer (501), the second-stage opposite double-spiral monomer (502) and the third-stage opposite double-spiral monomer (503), the distances between the first-stage opposite double-spiral monomer (501) and the second-stage opposite double-spiral monomer (502) and the distances between the second-stage opposite double-spiral monomer (502) and the third-stage opposite double-spiral monomer (503) are the same; the arrangement angle difference between the first-stage opposite double-spiral single body (501) and the second-stage opposite double-spiral single body (502) and between the second-stage opposite double-spiral single body (502) and the third-stage opposite double-spiral single body (503) is 120 degrees.

4. The anti-clogging device of an opposed spiral straw row wheat no-tillage planter as claimed in claim 1, wherein: the cutting edge curve (605) of the opposite double-spiral blade monomer (6) is a standard spiral line, an Archimedes spiral line or a hyperbolic line.

5. The anti-clogging device of an opposed spiral straw row wheat no-tillage planter as claimed in claim 1, wherein: the length of a helical line of the blade (602) in the axial direction is 0-0.5 times of the pitch length; the pitch is 100-1000 mm, and the outer diameter of the helical blade is 100-1000 mm.

6. The anti-clogging device of an opposed spiral straw row wheat no-tillage planter as claimed in claim 1, wherein: the straw returning and blocking prevention mechanism (2) comprises six straw returning and blocking prevention single bodies (401), and every three straw returning and blocking prevention single bodies (401) are fixed together through a fixed square pipe (402).

7. The anti-clogging device of an opposed spiral straw row wheat no-tillage planter as claimed in claim 1, wherein: the distance between the bottom of the material containing groove (801) and the ground is 0-100 mm.

8. The anti-clogging device of an opposed spiral straw row wheat no-tillage planter as claimed in claim 1, wherein: the length of the flow guide anti-blocking plate (803) of the straw returning anti-blocking monomer (401) is 100-300 mm.

Technical Field

The invention belongs to the field of agricultural machinery, and particularly relates to an anti-blocking device of a wheat no-tillage seeding machine with opposite spiral straw rows.

Background

The protective cultivation is a cultivation mode for no-tillage and little-tillage of the uncultivated land covering the straws of the previous crops, and the cultivation mode can improve the organic matter content of the soil, effectively reduce the wind erosion and water erosion conditions of the soil and improve the fertility and drought resistance of the soil. The planting mode of no-tillage operation in the drip irrigation area adopts a wide-row and narrow-row alternate arrangement mode, the field ventilation and light transmission are good, and the effects of cost saving and efficiency improvement can be achieved by combining a protective farming technology with the wide-row and narrow-row planting mode in the drip irrigation area. When no-tillage seeding operation is carried out in wide and narrow rows in a Xinjiang bole drip irrigation area, the amount of straws on the ground surface is large, thick and hard, and the straws are distributed disorderly due to much dry wind, so that on one hand, the no-tillage seeding machine consumes large power during operation, and is often blocked, so that the seeding machine cannot normally operate; on the other hand, if the straw and the stubbles are scattered in the sowing row during the operation of the sowing machine, the contact effect of the seeds and the soil can be influenced, the implantation quality of the seeds is reduced, and the difficulty of effective sowing is increased. Therefore, in order to solve the problems that the no-tillage planter is easy to block and messy straws are orderly arranged in order during operation, the anti-blocking arranging device is designed, and can timely discharge the straws from the planter, orderly arrange the straws to a non-planting area and effectively improve the cleaning degree in a seed zone.

Disclosure of Invention

In order to solve the problems, the invention aims to provide an anti-blocking device of a wheat no-tillage planter with opposite spiral straw rows, which can effectively reduce the blocking condition of the planter and a furrow opener and improve the operation stability and the furrow depth consistency; the straw on the sowing belt can be effectively cleaned, the field straw is orderly arranged, the seed airing rate can be reduced, the no-tillage sowing quality is improved, and the yield of crops is increased.

The purpose of the invention is realized by the following technical scheme:

the utility model provides a stifled device is prevented to spiral straw row's of opposition no-tillage seeder, no-tillage seeder's below has arranged rotary blade 4 and furrow opener 3 by preceding to the back, prevent stifled device and include: the device comprises a driving mechanism, an opposite spiral straw poking and conveying mechanism 1 and a straw returning and anti-blocking mechanism 2; wherein the content of the first and second substances,

the opposite spiral straw pushing and conveying mechanism 1 is arranged right behind the rotary tillage cutter 4 and is connected with a no-tillage planter through a frame 302; the straw returning and anti-blocking mechanism 2 is arranged right in front of the furrow opener 3 and is positioned behind the opposite spiral straw pushing and conveying mechanism 1;

the opposite spiral type straw poking and conveying mechanism 1 comprises a blade shaft 603, an opposite double-spiral blade group 301, a rack 302, a bearing 303 and a supporting seat 304; wherein the content of the first and second substances,

the blade shaft 603 is supported on the frame 302 through the bearing 303 and the support base 304, and the blade shaft 603 is driven by the driving mechanism to rotate;

the opposed double-spiral blade group 301 comprises n opposed double-spiral blade single bodies 6, the distance between two adjacent double-spiral blade single bodies 6 is the same, and the arrangement angles between the adjacent double-spiral blade single bodies 6 have the same angle difference; the angle difference theta of the arrangement angles between two adjacent double-spiral blade monomers 6 is 360 DEG/n, and n is more than or equal to 1; the opposed double helical blade single bodies 6 of the opposed helical straw poking and conveying mechanism 1 can convey straws to two sides of the opposed double helical blade single bodies 6;

the position of each opposite double-spiral blade single body 6 corresponds to one sowing belt, and the gap part between two adjacent opposite double-spiral blade single bodies 6 corresponds to a non-sowing area between the two sowing belts;

the opposed double helical blade cells 6 comprise blades 602 and blade edges 604, wherein each opposed double helical blade cell 6 comprises two sets of blades 602 opposed with respect to a center point of symmetry on the blade axis 603, wherein the first set of blades 602 comprises a first helical blade 607 and a second helical blade 608, and the second set of blades 602 comprises a third helical blade 609 and a fourth helical blade 610; the first helical blade 607 and the second helical blade 608 are opposed with respect to a plane perpendicular to the blade shaft 203 and passing through the blade cusp point 606 and the center point of symmetry of the first helical blade 607 and the second helical blade 608 on the blade shaft 603; the third helical blade 609 and the fourth helical blade 610 are opposed to a plane perpendicular to the blade axis 203 and passing through the blade tip point 606 and the center point of symmetry of the third helical blade 609 and the fourth helical blade 610 on the blade axis 603;

the bottom of the blade 602 is fixed on the blade shaft 603, and the top of the blade 602 is a blade edge 604 with an edge curve 605;

the point where the first helical blade 607 and the second helical blade 608 gradually come together along with the top edge curve 605 and are connected is the blade tip point 606 of the first helical blade 607 and the second helical blade 608; the point where the third helical blade 609 and the fourth helical blade 610 gradually get closer together along with the top edge curve 605 and are connected is the blade tip point 606 of the third helical blade 609 and the fourth helical blade 610;

the curved shape of the blade 602 is determined by the edge curve 605;

the straw returning and anti-blocking mechanism 2 comprises n straw returning and anti-blocking monomers 401, wherein n is more than or equal to 1; the opposite double helical blade single bodies 6 correspond to the straw returning anti-blocking single bodies 401 in the front and rear direction one by one;

the position of each group of straw row-returning anti-blocking monomers 401 corresponds to one sowing belt, and the gap position between two adjacent straw row-returning anti-blocking monomers 401 corresponds to a non-sowing area between two sowing belts;

one end of the triangular bracket 804 is connected with the baffle 802, and the other end is connected with the no-tillage planter; the straw row-returning anti-blocking monomer 401 is connected with a no-tillage planter through a baffle 802 and a triangular bracket 804; the baffle 802 and the flow guide blockage preventing plate 803 are integrally formed, and the flow guide blockage preventing plate 803 is positioned at the rear side part of the baffle 802; the material containing groove 801 is positioned at the lower part of the baffle 802, and the material containing groove 801 is connected with the baffle 802 and the flow guide anti-blocking plate 803; the material containing groove 801 corresponds to the blade 602 of the opposite double helical blade single body 6 positioned in front of the material containing groove, and the blade 602 can rotate to pass through the upper surface of the material containing groove 801 and has a certain distance with the upper surface of the material containing groove 801.

The driving mechanism is driven by a tractor rear output shaft after speed change or is driven by a hydraulic motor independently.

The opposed double-spiral blade group 301 comprises a first-stage opposed double-spiral monomer 501, a second-stage opposed double-spiral monomer 502 and a third-stage opposed double-spiral monomer 503 from inside to outside, and the first-stage opposed double-spiral monomer 501, the second-stage opposed double-spiral monomer 502 and the third-stage opposed double-spiral monomer 503 are opposed double-spiral blade monomers 6 and have the same structure;

in each group of the first-stage opposite double-spiral monomer 501, the second-stage opposite double-spiral monomer 502 and the third-stage opposite double-spiral monomer 503, the distances between the first-stage opposite double-spiral monomer 501 and the second-stage opposite double-spiral monomer 502 and the distances between the second-stage opposite double-spiral monomer 502 and the third-stage opposite double-spiral monomer 503 are the same; the arrangement angle difference between the first-stage opposed double-spiral single body 501 and the second-stage opposed double-spiral single body 502, and between the second-stage opposed double-spiral single body 502 and the third-stage opposed double-spiral single body 503 is 120 °.

The cutting edge curve 605 of the opposed double-helical blade monomer 6 is a standard spiral line, an Archimedes spiral line or a hyperbolic line.

The length of a helical line in the axial direction of the blade 602 is 0-0.5 times of the pitch length; the pitch is 100-1000 mm, and the outer diameter of the helical blade is 100-1000 mm.

The straw returning and anti-blocking mechanism 2 comprises six straw returning and anti-blocking monomers 401, and every three straw returning and anti-blocking monomers 401 are fixed together by a fixed square pipe 402.

The distance between the bottom of the material containing groove 801 and the ground is 0-100 mm.

The length of the flow guide anti-blocking plate 803 of the straw returning anti-blocking monomer 401 is 100-300 mm.

The invention has the beneficial effects that:

(1) the blocking condition of the seeder and the furrow opener can be effectively reduced, and the operation stability and the furrow depth consistency are improved;

(2) the straw on the sowing belt can be effectively cleaned, the field straw is orderly arranged, the seed airing rate can be reduced, the no-tillage sowing quality is improved, and the yield of crops is increased.

Drawings

FIG. 1 is a schematic diagram showing the relationship among an opposed spiral straw pushing mechanism, a straw returning anti-blocking mechanism, a furrow opener and a rotary blade;

FIG. 2a is a schematic structural view of an anti-blocking device of a no-tillage planter with oppositely arranged spiral straw rows;

FIG. 2b is a front view of the anti-blocking device of the opposed spiral straw row-grouping no-tillage planter;

FIG. 2c is a left side view of the anti-clogging device of the no-tillage planter with oppositely arranged spiral straw rows;

FIG. 3 is a schematic structural diagram of the opposed screw type straw pushing mechanism 1;

FIG. 4 is a schematic structural view of the straw returning and anti-blocking mechanism 2;

FIG. 5 is a front view of the opposed double helical blade set 301;

FIG. 6a is a view showing the structure of the opposed double helical blade unit 6;

FIG. 6b is a front view of a first opposing duplex monomer 501;

FIG. 6c is a left side view of the first opposing duplex monomers 501;

FIG. 7 is a schematic structural view of an opposing double helical blade set 301;

FIG. 8 is a schematic structural diagram of the straw row anti-blocking monomer 2;

FIG. 9 is a schematic view of the relationship between the straw row-setting anti-blocking single body 2 and the furrow opener 3.

Wherein the reference numerals are:

1. opposed spiral straw poking and conveying mechanism 2 and straw returning anti-blocking mechanism

3. Furrow opener 4, rotary blade

301. Opposed double helix blade set 302, frame

303. Bearing 304, supporting seat

401. Straw returning anti-blocking monomer 402 and fixed square pipe

501. First-stage opposite double-helix monomer 502 and second-stage opposite double-helix monomer

503. Three-stage opposed double-helix single body 6 and opposed double-helix blade single body

601. Blade tail end 602 and blade

603. Blade shaft 604 and blade cutting edge

605. Edge curve 606, blade cusp

607. First helical blade 608 and second helical blade

609. Third helical blade 610, fourth helical blade

801. Material containing groove 802 and baffle

803. Diversion anti-blocking plate 804 and triangular support

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples.

As shown in fig. 1, fig. 2a, fig. 2b and fig. 2c, an anti-blocking device of a wheat no-tillage planter with opposite-spiral straw row-arrangement comprises: a driving mechanism, an opposite spiral straw poking and feeding mechanism 1 and a straw returning and anti-blocking mechanism 2. The rotary blade 4 and the furrow opener 3 are arranged below the no-tillage seeding machine from front to back. The opposite spiral straw pushing and conveying mechanism 1 is arranged right behind the rotary tillage cutter 4 and is connected with a no-tillage planter through a frame 302. The straw returning and anti-blocking mechanism 2 is arranged right in front of the furrow opener 3 and is positioned behind the opposite spiral straw pushing and conveying mechanism 1.

The driving mechanism is driven by a tractor rear output shaft after speed change or is driven by a hydraulic motor independently.

As shown in fig. 3, 5, 6a, 6b, 6c and 7, the opposed helical straw pushing mechanism 1 comprises a blade shaft 603, opposed double helical blade sets 301, a frame 302, a bearing 303 and a support base 304; wherein the content of the first and second substances,

the blade shaft 603 is supported on the frame 302 through the bearing 303 and the support base 304, and the blade shaft 603 is driven to rotate by the driving mechanism.

The opposed double-spiral blade group 301 comprises n opposed double-spiral blade single bodies 6, the distance between two adjacent double-spiral blade single bodies 6 is the same, and the difference of the arrangement angles between two adjacent double-spiral blade single bodies 6 is the same. The arrangement angles between the adjacent double-helical blade single bodies 6 have the same angle difference theta of 360 DEG/n, wherein n is more than or equal to 1. The opposed double helical blade single bodies 6 of the opposed helical straw poking and conveying mechanism 1 can convey straws to two sides of the opposed double helical blade single bodies 6.

The position of each opposed double-spiral blade single body 6 corresponds to one sowing belt, and the gap position between two adjacent opposed double-spiral blade single bodies 6 corresponds to a non-sowing area between the two sowing belts.

In one embodiment, as shown in fig. 5, the opposed double-spiral blade set 301 includes, from inside to outside, a first-stage opposed double-spiral single body 501, a second-stage opposed double-spiral single body 502, and a third-stage opposed double-spiral single body 503, and the first-stage opposed double-spiral single body 501, the second-stage opposed double-spiral single body 502, and the third-stage opposed double-spiral single body 503 are opposed double-spiral blade single bodies 6 and have the same structure.

In each group of the first-stage opposite double-spiral monomer 501, the second-stage opposite double-spiral monomer 502 and the third-stage opposite double-spiral monomer 503, the distances between the first-stage opposite double-spiral monomer 501 and the second-stage opposite double-spiral monomer 502 and the distances between the second-stage opposite double-spiral monomer 502 and the third-stage opposite double-spiral monomer 503 are the same; the arrangement angle difference between the first-stage opposed double-spiral single body 501 and the second-stage opposed double-spiral single body 502, and between the second-stage opposed double-spiral single body 502 and the third-stage opposed double-spiral single body 503 is 120 °.

As shown in fig. 7, point O is the center of symmetry of the first-order opposing double-helix monomers 501 on the blade axis 603; point O' is the center of symmetry of the second-stage opposing double-helix monomers 502 on the blade axis 603; point O "is the center of symmetry of the three-stage opposing duplex monomers 503 on the blade axis 603. The line OA is located at the first end surface, which is a plane perpendicular to the blade axis 203 and passing through the blade cusp 606 and the point O of the one-stage opposing double-spiral single body 501, and passes through the blade cusp 606 of the one-stage opposing double-spiral single body 501. Line O 'B is located at a second end face, which is a plane perpendicular to the blade axis 203 and passing through the blade tip point 606 and point O' of the second-stage opposing double-spiral single body 502, and passes through the blade tip point 606 of the second-stage opposing double-spiral single body 502. The line O "C is located on the third end surface, which is a plane perpendicular to the blade axis 203 and passing through the blade tip 606 and the point O" of the third-stage opposed double-spiral single body 503, and passes through the blade tip 606 of the third-stage opposed double-spiral single body 503. Line OC' is the projection of line O "C on the first end face; line OB 'is a projection of line O' B on the first end face. The phase difference between the secondary opposed double-helix monomer 502 and the primary opposed double-helix monomer 501 is theta; the phase difference between the tertiary opposed double helix monomer 503 and the secondary opposed double helix monomer 502 is theta. The angle θ is 120 °.

On one hand, the arrangement mode can balance the static and dynamic stress of the blade shaft 603, reduce the abrasion of the blade shaft 603 and avoid the failure of the blade shaft 603; on the other hand can let three different opposition double helix blade monomers 6 not play the effect of propelling movement straw simultaneously: when one set of the opposed double helical blade single bodies 6 works, the other two sets are in a gap buffering state, so that the blockage situation of the opposed helical straw poking and conveying mechanism 1 can be effectively reduced.

The opposed double helical blade cells 6 comprise blades 602 and blade edges 604, wherein each opposed double helical blade cell 6 comprises two sets of blades 602 opposed with respect to a center point of symmetry on the blade axis 603, wherein the first set of blades 602 comprises a first helical blade 607 and a second helical blade 608, and the second set of blades 602 comprises a third helical blade 609 and a fourth helical blade 610. The first helical blade 607 and the second helical blade 608 are opposed with respect to a plane perpendicular to the blade shaft 203 and passing through the blade cusp point 606 and the center point of symmetry of the first helical blade 607 and the second helical blade 608 on the blade shaft 603; the third helical blade 609 and the fourth helical blade 610 are opposed to a plane perpendicular to the blade axis 203 and passing through the blade tip 606 and the center point of symmetry of the third helical blade 609 and the fourth helical blade 610 on the blade axis 603.

The bottom of the blade 602 is fixed to the blade shaft 603 and the top of the blade 602 is the blade edge 604 with an edge curve 605.

The point where the first helical blade 607 and the second helical blade 608 gradually come together along with the top edge curve 605 and are connected is the blade tip point 606 of the first helical blade 607 and the second helical blade 608; the point where the third helical blade 609 and the fourth helical blade 610 gradually come together and connect with the top edge curve 605 is the blade tip 606 of the third helical blade 609 and the fourth helical blade 610.

The positions gradually separated and farthest away with the top edge curve 605 are the blade ends 601 of the first helical blade 607 and the second helical blade 608 or the third helical blade 609 and the fourth helical blade 610.

The curved shape of the blade 602 is determined by the edge curve 605.

The cutting edge curves 605 of the opposed double-spiral blade monomers 6 are standard spiral lines, Archimedes spiral lines or hyperbolic lines, and the cutting edge curves of different types have different speeds and forces for pushing straws, so that a better effect can be achieved under corresponding operation environments.

The axial helical line length of the blade 602 is 0-0.5 times of the pitch length. The pitch is 100-1000 mm, and the outer diameter of the helical blade is 100-1000 mm.

The straw returning and anti-blocking mechanism 2 comprises n straw returning and anti-blocking monomers 401. Wherein n is more than or equal to 1. The opposite double helical blade single bodies 6 correspond to the straw returning anti-blocking single bodies 401 in the front and rear direction one by one.

In one embodiment, as shown in fig. 4, 8 and 9, the straw row-returning anti-blocking mechanism 2 comprises six straw row-returning anti-blocking monomers 401, and every three straw row-returning anti-blocking monomers 401 are fixed together by a fixed square pipe 402.

One end of the triangular bracket 804 is connected with the baffle 802, and the other end is connected with the no-tillage planter. The straw row-returning anti-blocking monomer 401 is connected with a no-tillage planter through a baffle 802 and a triangular bracket 804. The baffle 802 and the flow guide blockage prevention plate 803 are integrally formed, and the flow guide blockage prevention plate 803 is located on the rear side portion of the baffle 802. The material containing groove 801 is located at the lower part of the baffle 802, and the material containing groove 801 is connected with the baffle 802 and the flow guide anti-blocking plate 803 to play a role in supporting and fixing. The material containing groove 801 corresponds to the blade 602 of the opposite double-spiral blade single body 6 which is positioned in front of the material containing groove, and the blade 602 can rotate to pass through the upper surface of the material containing groove 801 and has a certain distance with the upper surface of the material containing groove 801.

The distance between the bottom of the material containing groove 801 and the ground is 0-100 mm.

The components of the furrow opener 3 are arranged right behind each straw row-returning anti-blocking monomer 401, as shown in fig. 9, the straw row-returning anti-blocking monomer 401 surrounds and protects the furrow opener 3 in the center through a baffle 802 in front and flow guide anti-blocking plates 803 on two sides, so that the straws are prevented from flowing into the furrow opener 3, and the blocking phenomenon of the furrow opener 3 is reduced.

The position of each group of straw row-returning anti-blocking monomers 401 corresponds to one sowing zone, the gap position between two adjacent straw row-returning anti-blocking monomers 401 corresponds to a non-sowing area between the two sowing zones, and most of straws can be piled up and collected to the non-sowing area between the two sowing zones through the pushing action of the blades 602 on the opposite double-spiral blade group 301, the containing buffering action of the material containing groove 801, the blocking action of the baffle 802 and the flow guiding action of the flow guiding anti-blocking plate 803. Because the straw returning anti-blocking monomer 401 and the soil and the straws thrown down to the material containing groove 801 in the straw returning anti-blocking monomer 401 by the rotary blade 4 are in direct contact with each other and have larger stress, the triangular support 804 can play a role in providing enough supporting force for the straw returning anti-blocking monomer 401, and the straw returning anti-blocking monomer 401 is prevented from losing efficacy for a long time.

Preferably, the length of the flow guide anti-blocking plate 803 of the straw returning anti-blocking monomer 401 is 100-300 mm, and the corresponding length mainly depends on the distance between the straw returning anti-blocking monomer 401 and the furrow opener 3 for surrounding protection.

The working process of the invention is as follows:

the opposite double helical blade single bodies 6 correspond to the straw returning anti-blocking single bodies 401 in the front and rear direction one by one. When the opposite double-helical-blade single bodies 6 work, firstly, the rotary tillage blades 4 throw straws and soil into the material containing grooves 801 of the straw blockage prevention single bodies 401; then, the blades 602 rotate at a constant speed under the driving of the blade shafts 603, the blade sharp points 606 of the two opposite blades are transferred onto the material containing groove 801 to be in contact with the straws and soil at the bottom end of the material containing groove 801, and the straws and the soil are extruded upwards; then, with the continuous rotation of the blade shaft 603, the area of the blade 602 entering the material containing groove 801 is gradually increased, and because the soil and the straw are downward precipitated under the action of gravity, the extrusion force of the blade tip 606 is gradually converted into pushing force to the soil and the straw to two sides, so that the straw and the soil are squeezed to the two sides; finally, after the blade shaft 603 rotates for one circle, the blades 602 at the tail ends 601 of the blades push the straws and soil at the two ends of the material containing groove 801 to the two sides of the straw returning anti-blocking unit 401.

The gap between every two adjacent straw row anti-blocking monomers 401 is a non-seeding area. Under the action of forward movement of the machine tool, a part of straws corresponding to the front and rear positions of a gap between the adjacent straw row returning anti-blocking monomers 401 directly pass through the two adjacent straw row returning anti-blocking monomers 401, and under the action of the forward movement and flow guide anti-blocking plate 803, the part of straws does not contact with the opposite spiral straw poking and feeding mechanism 1 and the straw row returning anti-blocking mechanism 2 and does not enter the sowing belt; other straws are thrown into the material containing groove 801 by the rotary tillage blades 4, pushed to the two sides of the straw row-returning anti-blocking monomer 401 by the blades 602 rotating at a constant speed on the opposite double-helix blade group 301, and gathered and piled with the straws which are not contacted before, and do not enter the sowing belt, so that the straw row-returning and anti-blocking functions are realized.

If a little straw or soil remains on the material containing groove 801 in continuous operation, the straw or soil can be scraped off by the blades 602 on the opposite double-spiral blade single bodies 6, and the anti-blocking effect is good.