Bionic passive and active cooperative low-resistance anti-blocking stubble device

Abstract

A biomimetic active-passive coordinated low-resistance anti-clogging stubble-breaking device includes a frame assembly, a power transmission device, and a stubble-breaking component. The stubble-breaking component includes a transmission fixing bracket, a dual-disc active stubble-breaking unit, and a corrugated disc passive stubble-breaking unit. The dual-disc active stubble-breaking unit comprises two back-to-back biomimetic concave serrated discs. The corrugated disc passive stubble-breaking unit comprises a corrugated disc, wherein the biomimetic concave serrated disc adopts the concave serrated disc of the third tooth of a biomimetic tea geometrid moth, and its surface has an asymmetrical progressive serrated structure, which can efficiently cut straw and prevent entanglement. The passive auxiliary unit is a corrugated disc, connected to the active stubble-breaking unit through a double-row angular contact bearing, to assist in breaking up residual straw and throwing it to both sides of the seedbed. This invention, through the active-passive combined design, reduces operating power consumption and soil disturbance rate by 22.5% and 20.19%, respectively, and increases the straw removal rate of the seedbed by 9.09%, making it suitable for no-till sowing stubble-breaking operations in wheat-corn rotation areas.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery and equipment technology, specifically to a biomimetic active-passive coordinated low-resistance anti-clogging and stubble-breaking device suitable for no-till sowing in straw-covered areas. Background Technology

[0002] The Huang-Huai-Hai region is the core production area of ​​wheat-maize rotation in my country. Under this model, the surface straw coverage is large and the stubble is tough. Especially after maize harvest, the amount of residual straw on the ground can reach 8-12 t / hm. 2 Furthermore, the stubble is tightly intertwined with the soil, posing significant challenges to subsequent no-till sowing operations. Traditional stubble-breaking devices often employ notched discs, corrugated discs, or passive stubble-clearing components, which present the following prominent problems in actual operation: First, the stubble-breaking blades are prone to straw entanglement and blockage, especially at the central drive shaft, leading to a sharp increase in operating resistance and a decrease in sowing quality after straw entanglement. Second, passive stubble-breaking units lack coordinated design with active units, relying solely on the machine's own weight or traction to achieve stubble breaking, resulting in insufficient cutting capacity, high straw residue rates, and poor seedbed flatness. Third, blindly increasing the blade penetration depth to enhance stubble breaking effects causes excessive soil disturbance, violating the original intention of conservation tillage.

[0003] To address the aforementioned problems, some improvements have been found in existing technologies. For example, Chinese patent CN220858841U discloses an adjustable-height stubble-breaking and ridging mechanism, which combines a corrugated disc with a weeding wheel. The overall height is adjusted via multiple stop holes welded between the weeding wheel mounting base and the corrugated disc frame, making it suitable for stubble-breaking and ridging operations under different terrain conditions. This mechanism, to a certain extent, solves the problem of complex height adjustment for stubble-breaking and ridging components, improving the machine's adaptability to different terrain conditions. However, this solution still has the following shortcomings: First, the mechanism adopts a passive operation mode as a whole. Both the corrugated disc and the weeding wheel rely on the forward power of the machine to rotate passively, lacking an active cutting unit. When facing high-toughness corn stalks or high stubble plots, the cutting ability is limited, and the stalks are easily broken and the stubble is not thoroughly cleared. Second, the coordination between the weeding wheel and the corrugated disc is insufficient. Although they are arranged in front and behind or left and right in space, they do not form a coaxial collaborative operation mode, resulting in unsatisfactory stalk removal and throwing effect, with some stalks still remaining in the seed zone area. Third, the mechanism only adapts to different working conditions through height adjustment, without optimizing the blade structure and power drive mode. The stubble breaking power consumption is high, making it difficult to meet the requirements of energy saving and consumption reduction.

[0004] To address the issues of insufficient cutting capacity and clogging in passive slag-breaking devices, biomimetic design offers a new approach to optimizing slag-breaking blades. During feeding, the mandibular teeth of the tea geometrid moth larva exhibit progressive cutting, good self-sharpening properties, and low cutting resistance. Their asymmetrical tooth profile allows for effective cutting of tough materials with relatively low power consumption. Currently, there are no reports of applying the biomimetic design of the tea geometrid moth larvae's mouthparts to active rotary slag-breaking blades and forming a coaxial nested active-passive collaborative slag-breaking structure with a passive auxiliary unit.

[0005] Therefore, developing a stubble breaking device that can simultaneously achieve efficient stubble breaking, low power consumption, anti-tangling, and minimal soil disturbance is of great significance for improving the quality of no-till seeding operations in the Huang-Huai-Hai region and promoting the application of conservation tillage technology. Summary of the Invention

[0006] The purpose of this invention is to provide a biomimetic active-passive coordinated low-resistance anti-clogging stubble breaking device to solve the technical problems of easy clogging, high power consumption and excessive soil disturbance in existing stubble breaking devices.

[0007] The technical solution adopted in this invention is: a biomimetic active-passive coordinated low-resistance anti-clogging stubble breaking device, comprising a frame assembly, a power transmission device, and several sets of stubble breaking components driven by the power transmission device. The stubble breaking components include a transmission fixing bracket, a double-disc active stubble breaking unit, and a corrugated disc passive stubble breaking unit; the double-disc active stubble breaking unit and the corrugated disc passive stubble breaking unit are coaxially mounted through the transmission shaft of the transmission fixing bracket. The dual-disc active slag breaking unit includes two back-to-back biomimetic concave sawtooth discs and a cutter holder; the corrugated disc passive slag breaking unit includes a corrugated disc and a connecting frame, the corrugated disc being coaxially mounted on the transmission shaft via a bearing unit and located between the two biomimetic concave sawtooth discs; the rotation axis of the corrugated disc passive slag breaking unit coincides with the rotation axis of the dual-disc active slag breaking unit, forming a coaxial nested active-passive composite slag breaking structure.

[0008] As a preferred embodiment, the serrated structure of the biomimetic concave serrated disk is based on the asymmetrical tooth shape design of the mandibles of the tea geometrid moth larva. The leading edge curve P1 and trailing edge curve P2 of the serrations are based on the contour curve of the second tooth of the mouthparts of the tea geometrid moth larva. The serrated contour curve is determined by the following equation: Equation for the leading edge curve P1 of the sawtooth: y = -5 × 10 -12 x 4 +2×10 -7 x 3 -0.0021x 2 +12.606x-18821 Equation for the sawtooth trailing edge curve P2: y=3×10-8 x 3 -0.0004x 2 +1.9457x -314.05 In the formula, the range of x is 0 mm ≤ x ≤ 130 mm.

[0009] As a preferred embodiment, the biomimetic concave sawtooth disk has a thickness h of 3.5-4.5 mm, a concave angle α of 143-145°, a sawtooth depth L of 12-14 mm, and a sawtooth spacing P. k It is 18-22mm.

[0010] As a preferred embodiment, the surface of the corrugated disk is distributed with continuous corrugated protrusions, the corrugation height is 48-52mm, the number of corrugations is 23-25, and the diameter of the disk is 550-570mm.

[0011] As a preferred embodiment, the transmission fixing bracket includes a mounting base, an end cover, a transmission disc, fastening screws, a single-row angular contact bearing, a transmission shaft, a bushing, a baffle, and a key. The mounting base serves as a basic support, the end cover is mounted on the mounting base, the transmission disc is fixed to the transmission shaft by fastening screws and a key, the single-row angular contact bearing is assembled at both ends of the transmission shaft, the bushing is located at the corresponding position on the transmission shaft, the baffle is fixed by bolts, and the key is located between the transmission shaft and the transmission disc and the cutter holder of the double-disc active shaving unit.

[0012] As a preferred embodiment, in the dual-disc active stubble breaking unit, two biomimetic concave serrated discs are staggered at 60° and installed back-to-back on both sides of the cutter holder. The biomimetic concave serrated discs are installed on the cutter holder by bolts and nuts.

[0013] As a preferred embodiment, in the corrugated disc passive slag breaking unit, the corrugated disc is installed on the connecting frame by bolts, flat washers and nuts; the double-row angular contact bearing is installed on the tool holder, and the double-row angular contact bearing is interference-fitted with the tool holder and the connecting frame, and the elastic retaining ring is positioned on the outer ring of the double-row angular contact bearing.

[0014] As a preferred embodiment, the drive shaft is a stepped shaft structure, including a bearing mounting shaft section and a drive disk connecting shaft section arranged coaxially in sequence. The bearing mounting shaft section has positioning steps at both ends, and the outer diameter difference of the positioning steps forms an annular boss for axial positioning of the bearing. The drive disk connecting shaft section has a keyway along the axial direction, and the keyway is connected to the keyway of the drive disk by a flat key. The shoulder transition of the drive shaft is provided with a rounded chamfer.

[0015] As a preferred embodiment, the stubble breaking component is provided in four sets, symmetrically distributed with the central axis of the frame as the symmetry reference, with two sets located in the inner central area below the frame and the other two sets located in the outer areas at both ends below the frame.

[0016] As a preferred embodiment, the power transmission device further includes a gearbox and a connecting frame. The power input shaft is connected to the gearbox via gears. The gearbox transmits power to two sets of slag-breaking components in the inner central area below the frame via a transmission disc. The power drives the two sets of slag-breaking components in the outer area below the frame to rotate via the transmission shaft, the transmission disc on the other side, and the connecting frame.

[0017] The beneficial effects of this invention are: This invention provides a biomimetic active-passive coordinated low-resistance anti-clogging and stubble-breaking device. Through optimized structural design, it has the following advantages compared to existing technologies: Firstly, the stubble-breaking device provided by this invention improves stubble-breaking efficiency and effectively reduces power consumption by using an active serrated disc to cut the straw and a passive corrugated disc to assist in crushing and throwing. Compared with the passive corrugated disc and weeding wheel combination structure used in existing technologies such as CN220858841U, this invention significantly improves the cutting ability of straw with high coverage through active and passive synergy, avoiding the problems of congestion and low operating efficiency caused by passive stubble breaking.

[0018] Secondly, the stubble-breaking device provided by this invention reduces straw entanglement and improves operational reliability by using an asymmetrical sawtooth and corrugated disc design. Existing height-adjustable stubble-breaking mechanisms, such as CN220858841U, while allowing height adjustment via a stop hole, lack an anti-entanglement structure between the weeding wheel and the corrugated disc, still posing a risk of entanglement under high straw coverage conditions. This invention, through the progressive cutting of the biomimetic sawtooth disc and its asymmetrical tooth design, effectively reduces the probability of entanglement, increasing the straw removal rate of the seed strip by more than 9%.

[0019] Thirdly, the stubble-breaking device provided by this invention uses a passive stubble-breaking unit to break only the surface straw, avoiding excessive tillage, protecting the soil structure, and meeting the requirements of conservation tillage. Compared to the soil disturbance that may occur when the weeding wheel and corrugated disc work together in CN220858841U, this invention, through a coaxial nested active-passive composite structure, allows the passive corrugated disc to only assist in weeding and pre-loosening the surface soil, reducing unnecessary soil tillage and lowering the soil disturbance rate by more than 20%, which is more conducive to the implementation of conservation tillage.

[0020] Fourth, in the stubble breaking device provided by the present invention, the sawtooth structure of the biomimetic concave sawtooth disc is designed based on the asymmetrical tooth shape of the mandible of the tea geometrid moth larva. The leading edge curve P1 and trailing edge curve P2 of the sawtooth are designed by proportionally enlarging the contour curve of the second tooth of the mouthparts of the tea geometrid moth larva. The corrugated disc is used to pre-loosen the soil to achieve active and passive coordinated stubble breaking operation. Experimental studies have shown that the power consumption of the present invention is reduced by more than 22% compared with the traditional arc-shaped sawtooth disc. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is an isometric view of a biomimetic active-passive coordinated low-resistance anti-clogging and stubble-breaking device of the present invention; Figure 2 This is a cross-sectional view of one embodiment of the stubble breaking component in a biomimetic active-passive coordinated low-resistance anti-clogging stubble breaking device of the present invention; Figure 3 This is a cross-sectional view of the transmission fixed bracket in a biomimetic active-passive coordinated low-resistance anti-clogging and stubble breaking device of the present invention. Figure 4 This is a schematic diagram of the dual-disc active stubble breaking unit in a biomimetic active-passive coordinated low-resistance anti-clogging stubble breaking device of the present invention; Figure 5 This is a schematic diagram of the corrugated disc passive slag breaking unit in a biomimetic active-passive coordinated low-resistance anti-clogging slag breaking device of the present invention; Figure 6 This is a schematic diagram of the biomimetic concave sawtooth disk in the biomimetic active-passive coordinated low-resistance anti-clogging and stubble breaking device of the present invention. Figure 7 A prototype drawing of a biomimetic concave sawtooth disk; Figure 8 A side projection schematic diagram of the concave sawtooth disks used in the three comparative examples.

[0023] Reference numerals: 1. Frame; 2. Three-point suspension; 3. Gearbox; 4. Connecting frame; 5. Transmission disc; 6. Fastening screw; 7. Baffle plate; 8. Through-hole end cover; 9. Blind cover; 10. Mounting seat; 11. Single-row angular contact bearing; 12. Key; 13. Drive shaft; 14. Bushing; 15. Bionic concave serrated disc; 16. Tool holder; 17. Flat washer; 18. Nut; 19. Bolt; 20. Corrugated disc; 21. Elastic retaining ring; 22. Connecting frame; 23. Double-row angular contact bearing; 24. Secondary nut; 25. Small flat washer; 26. Secondary bolt. Detailed Implementation

[0024] The present invention will now be described in detail through exemplary embodiments. However, it should be understood that, without further description, elements, structures, and features in one embodiment may be advantageously incorporated into other embodiments.

[0025] It should be noted that, unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains; the words "a," "an," or "the" and similar terms used in the patent application specification and claims of this invention do not express a quantity limitation, but rather indicate the presence of at least one; the words "comprising" or "including" and similar terms indicate that the elements or objects preceding "comprising" or "including" cover the elements or objects listed following "comprising" or "including" and their equivalents, but do not exclude other elements or objects having the same function; Example 1

[0026] The following is in conjunction with the appendix Figure 1-7 The specific structure and working process of a biomimetic active-passive coordinated low-resistance anti-clogging and stubble-breaking device are described in detail below: See Figures 1 to 2 As shown, the biomimetic active-passive coordinated stubble breaking device includes a frame assembly A, a power transmission device B mounted on the frame assembly A, and stubble breaking components C driven by the power transmission device B. The stubble breaking components C are provided in several groups, evenly spaced and mounted on the transmission shaft 13 driven by the power transmission device B.

[0027] The frame assembly A includes a frame 1 and a three-point suspension frame 2 mounted on the upper part of the frame 1. The three-point suspension frame 2 is used to connect the frame 1 to the tractor suspension device. The gearbox 3 is mounted on the frame 1 and receives external power through the power input shaft and transmits it to the stubble breaking component C below. In this embodiment, there are four sets of stubble breaking components C, which are evenly distributed in the lower area of ​​the frame 1. All four sets of stubble breaking components are mounted on the connecting frame 4 that cooperates with the frame 1 through mounting seats 10. The mounting seats 10 and the connecting frame 4 are fastened with bolts to ensure that the stubble breaking components can rotate stably with the connecting frame 4.

[0028] In this design, the four sets of stubble breaking components are symmetrically distributed with the central axis of frame 1 as the symmetrical reference. Two sets are symmetrically arranged in the inner central area centered on the central axis of frame 1, that is, in the relatively middle position below frame 1 near the central axis. The other two sets are correspondingly arranged at the end positions of both ends of the central axis of frame 1, that is, in the outer area below frame 1 near the left and right ends. The symmetrical installation can make the force during stubble breaking more balanced, thereby improving stubble breaking efficiency and work quality.

[0029] The specific structure of the stubble breaking component C includes a transmission fixing bracket C-1, a double-disc active stubble breaking unit C-2, and a corrugated disc passive stubble breaking unit C-3. The two are coaxially installed through the transmission shaft 13 of the transmission fixing bracket C-1, wherein the corrugated disc passive stubble breaking unit C-3 is mounted on the transmission shaft 13 through a bearing unit.

[0030] See Figure 3 As shown, the transmission fixing bracket C-1 is composed of a transmission disc 5, fastening screws 6, baffles 7, through-hole end caps 8, mounting base 10, single-row angular contact bearings 11, key 12, transmission shaft 13, and bushing 14. The mounting base 10 serves as a basic support, providing an installation reference. The through-hole end caps 8 are installed on the mounting base 10 to enclose and protect the internal structure. The transmission disc 5 is fixed to the transmission shaft 13 by fastening screws 6, and the tractor's power is fixed to the transmission shaft 13 through six M14 screw holes. The single-row angular contact bearings 11 are assembled on the transmission shaft 13, bearing axial and radial loads, and have an overfit with the transmission shaft 13 and mounting base 10. The bushing 14 is located on the transmission shaft 13 to ensure accurate axial positioning. The baffles 7 are fixed by fastening screws 6 to limit component displacement. The key 12 is located between the transmission shaft 13 and the transmission disc 5 and the cutter holder 16 of the double-disc active shaving unit C-2.

[0031] See Figure 4 As shown, the dual-disc active shaving unit C-2 is composed of a biomimetic concave serrated disc 15, a cutter holder 16, a flat washer 17, a nut 18, and a bolt 19 connected together; wherein, the biomimetic concave serrated discs 15 are staggered at 60° and installed back-to-back on both sides of the cutter holder 16, from... Figure 2 As can be seen, the two biomimetic concave serrated discs 15 have opposite concave directions. The biomimetic concave serrated discs 15 are evenly provided with 6 mounting holes, and the mounting holes are fastened to the tool holder 16 by bolts 19, flat washers 17 and nuts 18.

[0032] See Figure 5As shown, the corrugated disc passive stubble-crushing unit C-3 is composed of a corrugated disc 20, an elastic retaining ring 21, a connecting frame 22, a double-row angular contact bearing 23, a secondary nut 24, a small flat washer 25, and a secondary bolt 26. The corrugated disc passive stubble-crushing unit C-3 is used for auxiliary crushing and throwing of straw. The double-row angular contact bearing 23 forms a separate, relatively rotating structure between the corrugated disc passive stubble-crushing unit C-3 and the cutter holder 16. The double-row angular contact bearing 23 is mounted on the drive shaft 13, with its inner ring and the drive shaft 13 having an interference fit, and its outer ring and the connecting frame 22 also having an interference fit. The corrugated disc 20 is mounted on the drive shaft 13 via the secondary bolt 26, the small flat washer 25, and the secondary nut 24. The drive shaft 13 transmits power to the bionic material via the cutter holder 16. The concave serrated disc 15 rotates at high speed, cutting V-shaped grooves on both sides of the seed strip, sliding and throwing the straw backward, and shearing and crushing the stubble. Then, the crushed stubble and topsoil are guided into the V-shaped grooves on both sides of the seed strip. At this time, the tractor traction device moves forward, and the corrugated disc passive stubble breaking unit C-3 is passively followed by the rotation of the double-row angular contact bearing 23, which is the same as the ground speed, to achieve pre-loosening and compression of soil, straw and stubble. The corrugated disc 20 in the corrugated disc passive stubble breaking unit C-3 is passively rotated with the cutter seat 16 during operation. Its corrugated protrusions on the surface periodically push the residual straw cut by the double disc active stubble breaking unit C-2 to both sides of the seed strip. At the same time, the corrugated edge generates a slight disturbance to the topsoil, thus ensuring the effect of stubble breaking and pre-loosening of the soil.

[0033] refer to Figure 6 As shown, in this embodiment, the thickness h of the biomimetic concave sawtooth disk 15 is 4 mm, the concave angle α is 144°, the sawtooth height L is 13 mm, and the sawtooth spacing P is... k It is 20 mm, and the mounting port diameter is... The diameter is 70 mm; the biomimetic sawtooth curve of the biomimetic concave sawtooth disk 15 is composed of the leading edge curve P1 and the trailing edge curve P2, wherein the leading edge curve P1 and the trailing edge curve P2 are respectively based on the contour curve p1 and curve p2 of the second tooth of the mouthparts of the tea geometrid moth larva. Figure 7The biomimetic sawtooth curve of the concave sawtooth disk 15 is obtained by proportional magnification, which enables progressive cutting, reduces power consumption, and improves straw removal rate in the seed strip. The specific process is as follows: the mouthparts of the tea geometrid moth larva are photographed under a scanning electron microscope, the image is imported into AutoCAD software, the contour curve of the second tooth of the mouthparts is extracted, and its height L0 is measured. Based on the tooth height L of the traditional arc-shaped sawtooth disk, the contour curve of the second tooth of the tea geometrid moth larva is proportionally magnified using L / L0 as the magnification ratio to obtain the biomimetic sawtooth curve of the concave sawtooth disk 15. Points are plotted on the magnified biomimetic sawtooth curve, and the coordinate data is exported. Curve fitting is performed using Excel software, and the resulting curve equation is: Equation for the leading edge curve P1 of the sawtooth: y = -5 × 10 -12 x 4 +2×10 -7 x 3 -0.0021x 2 +12.606x-18821; Equation for the sawtooth trailing edge curve P2: y = 3 × 10 -8 x 3 -0.0004x 2 +1.9457x -314.05; In the formula, the range of x is 0 mm ≤ x ≤ 130 mm.

[0034] To more clearly describe the effectiveness of this solution, through... Figure 8 A comparative analysis of three proportions: Comparative Example 1 It should be noted that Comparative Example 1 is based on Example 1, but with changes made to the tooth structure of the serrated disk, such as... Figure 8 As shown in (1), a traditional arc-shaped sawtooth disk is used, and its sawtooth cutting edge is composed of two arcs with a radius of 120 mm. Experimental studies show that the bionic concave sawtooth disk 15 in the above embodiment 1 has reduced power consumption and soil disturbance rate by 22.5% and 20.19% respectively compared with the traditional arc-shaped sawtooth disk, and increased the straw removal rate of the seed strip by 9.09%.

[0035] Comparative Example 2 It should be noted that Comparative Example 2 is based on Example 1, but with changes made to the tooth structure of the serrated disk, such as... Figure 8 As shown in (2), a biomimetic concave sawtooth disk I is used. Its sawtooth biomimetic curve is composed of the leading edge curve O1 and the trailing edge curve O2. The leading edge curve O1 and the trailing edge curve O2 shown are obtained by proportionally enlarging the contour curves o1 and o2 of the first tooth of the mouthparts of the tea geometrid moth larva. Equation of the leading edge curve O1 of the biomimetic concave sawtooth disk I: y = -5 × 10 -17 x 5 +7×10 -12 x 4 -3×10 -7 x 3 +6.9×10 -3 x 2 -67.355x + 2.55949 × 10 5 The equation for the trailing edge curve O2 of the biomimetic concave sawtooth disk 1 is as follows: y=8×10 -15 x 5 -6×10 -10 x 4 +2×10 -5 x 3 -2.961×10 -1 x 2 +2303.9×10x-7×10 6 In the formula, the range of x is 0 mm ≤ x ≤ 130 mm; Experimental studies show that, compared with the bionic concave serrated disk I, the power consumption and soil disturbance rate of the bionic concave serrated disk 15 in Example 1 are reduced by 36.12% and 12.5% ​​respectively, and the straw removal rate of the seed strip is increased by 9.09%.

[0036] Comparative Example 3 It should be noted that Comparative Example 3 is based on Example 1, but with changes made to the tooth structure of the serrated disk, such as... Figure 8 As shown in (3), a biomimetic concave sawtooth disk II is used. Its sawtooth biomimetic curve is composed of the leading edge curve Q1 and the trailing edge curve Q2. The leading edge curve Q1 and the trailing edge curve Q2 shown are obtained by proportionally enlarging the contour curves q1 and q2 of the first tooth of the mouthparts of the tea geometrid moth larva. Equation Q1 for the leading edge curve of the biomimetic concave sawtooth disk II: y = -5 × 10 -12 x 4 +2×10 -7 x 3 -2.1×10 -3 x 2 +12.606x - 1.8821 × 10 4 The equation for the trailing edge curve Q2 of the biomimetic concave sawtooth disk II: y=3×10 -8 x 3 -4×10 -4 x 2+1.9457x -314.05 In the formula, the range of x is 0 mm ≤ x ≤ 130 mm; Experimental studies show that, compared with the bionic concave serrated disk II, the power consumption and soil disturbance rate of the bionic concave serrated disk 15 in Example 1 are reduced by 18.87% and 22.2% respectively, and the straw removal rate of the seed strip is increased by 33.33%.

[0037] The above results show that the biomimetic concave sawtooth disk 15 described in Example 1 has better performance in terms of power consumption, soil disturbance rate, and straw removal rate in the seed strip than the above three comparative examples.

[0038] The parts not described in detail in the above embodiments are existing technologies.

[0039] It should be noted that although the present invention has been described through the above embodiments, the present invention may have many other embodiments. Without departing from the spirit and scope of the present invention, those skilled in the art can obviously make various corresponding changes and modifications to the present invention, but all such changes and modifications should fall within the scope of protection of the appended claims and their equivalents.

Claims

1. A biomimetic active-passive coordinated low-resistance anti-clogging stubble-breaking device, comprising a frame assembly A, a power transmission device B, and several sets of stubble-breaking components C driven by the power transmission device B, characterized in that: The stubble breaking assembly C includes a transmission fixing bracket (C-1), a double-disc active stubble breaking unit (C-2), and a corrugated disc passive stubble breaking unit (C-3); the double-disc active stubble breaking unit (C-2) and the corrugated disc passive stubble breaking unit (C-3) are coaxially installed through the transmission shaft (13) of the transmission fixing bracket (C-1); The dual-disc active stubble breaking unit (C-2) includes two back-to-back biomimetic concave sawtooth discs (15) and a cutter holder (16). The corrugated disc passive slag breaking unit (C-3) includes a corrugated disc (20) and a connecting frame (22). The corrugated disc (20) is coaxially mounted on the transmission shaft (13) through a bearing unit and is located between two biomimetic concave sawtooth discs (15). The rotation axis of the corrugated disc passive slag breaking unit (C-3) coincides with the rotation axis of the double disc active slag breaking unit (C-2), forming a coaxial nested active-passive composite slag breaking structure.

2. The biomimetic active-passive coordinated low-resistance anti-clogging and stubble-breaking device according to claim 1, characterized in that: The serrated structure of the biomimetic concave serrated disk (15) is based on the asymmetrical tooth shape design of the mandibles of the tea geometrid moth larva. The leading edge curve P1 and trailing edge curve P2 of the serrations are based on the contour curve of the second tooth of the mouthparts of the tea geometrid moth larva. The serrated contour curves are determined by the following equations: Equation for the leading edge curve P1 of the sawtooth: y =-5×10 -12 x 4 +2×10 -7 x 3 -0.0021 x 2 +12.606 x -18821 Equation for the sawtooth trailing edge curve P2: y =3×10 -8 x 3 -0.0004 x 2 +1.9457 x -314.05 In the formula, the range of x is 0 mm ≤ x ≤ 130 mm.

3. The biomimetic active-passive coordinated low-resistance anti-clogging and stubble-breaking device according to claim 2, characterized in that: The biomimetic concave sawtooth disk (15) has a thickness h of 3.5-4.5 mm, a concave angle α of 143-145°, a sawtooth depth L of 12-14 mm, and a sawtooth spacing P. k It is 18-22mm.

4. A biomimetic active-passive coordinated low-resistance anti-clogging and stubble-breaking device according to claim 1 or 2, characterized in that: The surface of the corrugated disk (20) is covered with continuous corrugated protrusions, with a corrugation height of 48-52 mm, a number of corrugations of 23-25, and a disk diameter of 550-570 mm.

5. A biomimetic active-passive coordinated low-resistance anti-clogging and stubble-breaking device according to claim 1 or 2, characterized in that: The transmission fixing bracket (C-1) includes a mounting base (10), an end cover (8), a transmission disc (5), fastening screws (6), a single-row angular contact bearing (11), a transmission shaft (13), a bushing (14), a baffle (7), and a key (12). The mounting base (10) serves as a basic support, the end cover (8) is mounted on the mounting base (10), the transmission disc (5) is fixed to the transmission shaft (13) by fastening screws (6) and key (12), the single-row angular contact bearing (11) is assembled at both ends of the transmission shaft (13), the bushing (14) is located at the corresponding position of the transmission shaft (13), the baffle (7) is fixed by bolts, and the key (12) is located between the transmission shaft (13) and the transmission disc (5) and the knife holder (16) of the double-disc active shaving unit (C-2).

6. A biomimetic active-passive coordinated low-resistance anti-clogging and stubble-breaking device according to claim 1 or 2, characterized in that: In the dual-disc active stubble breaking unit (C-2), two biomimetic concave serrated discs (15) are staggered at 60° and installed back-to-back on both sides of the cutter holder (16). The biomimetic concave serrated discs (15) are installed on the cutter holder (16) by bolts (19) and nuts (18).

7. A biomimetic active-passive coordinated low-resistance anti-clogging and stubble-breaking device according to claim 1 or 2, characterized in that: In the corrugated disc passive slag breaking unit (C-3), the corrugated disc (20) is installed on the connecting frame (22) by bolts, flat washers and nuts; the double row angular contact bearing (23) is installed on the tool holder (16), and the double row angular contact bearing (23) is interference-fitted with the tool holder (16) and interference-fitted with the connecting frame (22), and the elastic retaining ring (21) is positioned on the outer ring of the double row angular contact bearing (23).

8. A biomimetic active-passive coordinated low-resistance anti-clogging and stubble-breaking device according to claim 1 or 2, characterized in that: The drive shaft (13) is a stepped shaft structure, including a bearing mounting shaft section and a drive disk connecting shaft section arranged coaxially. The bearing mounting shaft section has positioning steps at both ends. The outer diameter difference of the positioning steps forms an annular boss for axial positioning of the bearing. The drive disk connecting shaft section has a keyway along the axial direction. The keyway is connected to the keyway of the drive disk (5) by a flat key. The shoulder transition of the drive shaft (13) is provided with a rounded chamfer.

9. A biomimetic active-passive coordinated low-resistance anti-clogging and stubble-breaking device according to claim 1 or 2, characterized in that: The stubble breaking assembly is provided in four sets, which are symmetrically distributed with the central axis of the frame (1) as the symmetry reference. Two sets are set in the inner central area below the frame (1), and the other two sets are set in the outer areas at both ends below the frame (1).

10. A biomimetic active-passive coordinated low-resistance anti-clogging and stubble-breaking device according to claim 9, characterized in that: The power transmission device also includes a gearbox (3) and a connecting frame (4). The power input shaft is connected to the gearbox (3) via gears. The gearbox (3) transmits power to the two sets of slag breaking components in the inner central area below the frame (1) via the transmission disc (5). The power drives the two sets of slag breaking components in the outer area below the frame (1) to rotate via the transmission shaft (13) and the transmission disc (5) on the other side and the connecting frame (4).

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