Bionic special-shaped alfalfa cutting tool

Abstract

This invention relates to the field of agricultural machinery technology, specifically to a biomimetic irregularly shaped alfalfa cutter, comprising an integrally formed cutting section and mounting section. The blade profile of the cutting section is formed by at least four sequentially connected biomimetic curves AB, BE, EF, and FA smoothly connected in sequence. The profile of the mounting section is formed by biomimetic curves BE, ED, DC, CG, and GH. The cutting section includes an upper surface, a lower surface, a front surface, a left cutting surface, and a right cutting surface. The mounting section includes a left side surface, a right side surface, a rear surface, a top mounting surface, and a bottom surface. The upper surface of the blade is provided with seven biomimetic fish fin patterns, and the front surface of the blade is provided with fourteen irregularly shaped curve patterns of the same shape. A torsion angle of 3°-8° is provided between the cutting section and the mounting section. This invention solves the problems of high cutting resistance, high power consumption, easy stem tearing, poor stubble consistency, easy grass entanglement and clogging, rapid blade wear, short service life, and poor installation versatility of current alfalfa cutters.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery technology, specifically to a biomimetic alfalfa cutting tool. Background Technology

[0002] Alfalfa is a high-quality forage crop widely cultivated in my country. It has high nutritional value and can be harvested repeatedly. The quality of mechanized harvesting directly determines the quality of the forage harvest and the plant's regeneration ability. At present, the cutting blades of domestic alfalfa harvesting machinery are mostly traditional straight-plate or simple curved-blade structures. The structural design is simple and has many defects in field operation. Traditional blades mainly rely on rigid compression and hard shearing to cut alfalfa stalks. The cutting contact resistance is large and the machine power consumption is high. It is easy to cause problems such as stalk tearing, stubble breakage, and straw entrainment. As a result, the alfalfa stubble surface is uneven and the stubble consistency is poor after harvesting, which seriously affects the subsequent regeneration and secondary yield of alfalfa. At the same time, the surface of traditional blades is smooth and there is no guide and anti-tangling structure. During operation, forage juice and soil are easily adhered, and grass tangling and blade blockage occur frequently, causing harvesting to be interrupted. Frequent manual cleaning is required, which greatly increases the labor intensity and production cost.

[0003] In addition, conventional blades experience concentrated stress and large vibration amplitude during operation, resulting in rapid blade wear, short service life, poor versatility in installation structure, and cumbersome disassembly and assembly. They cannot be well adapted to mainstream alfalfa harvesting equipment and cannot meet the current demand for large-scale, low-loss, and high-efficiency mechanized harvesting of alfalfa.

[0004] In summary, this invention proposes a biomimetic irregular alfalfa cutting tool to solve the problems mentioned in the background art. Summary of the Invention

[0005] The purpose of this invention is to provide a biomimetic irregular alfalfa cutting tool to solve the problems of existing alfalfa cutting tools, such as high cutting resistance, high power consumption, easy tearing of stems, poor stubble consistency, easy entanglement and clogging of the blade, rapid wear of the tool, short service life, and poor installation versatility.

[0006] A biomimetic alfalfa cutting tool includes an integrally formed cutting part and a mounting part. The blade profile of the cutting part is formed by at least four sequentially connected biomimetic curves AB, BE, EF, and FA to simulate the shape of a fish body. Curves AB and EF correspond to the main body of the fish and are convex arc-shaped. The profile of the mounting part is formed by biomimetic curves BE, ED, DC, CG, and GH to simulate the shape of a fish tail fin. Curves BC and ED are the outer edges of the fish tail and are inwardly curved. Curves DC and CG are transition arcs, and curve GH is the outwardly curved rear edge of the tail fin. The cutting part includes an upper surface, a lower surface, a front surface, a left cutting surface, and a right cutting surface. The mounting part includes a left side surface, a right side surface, a rear surface, a top mounting surface, and a bottom surface.

[0007] The upper surface of the cutting tool is provided with seven biomimetic fish fin patterns, namely the first to the seventh biomimetic fish fin patterns, wherein the nth biomimetic fish fin pattern is a biomimetic curve A. n B n and B n C n The components are connected smoothly in sequence, n=1,2……7. The biomimetic fish fin pattern simulates the streamlined structure of the fins of fish in nature, which is used to reduce the frictional resistance between the grass stalks and the blade surface during the cutting process, while guiding the chopped material to be discharged smoothly and preventing grass from getting tangled.

[0008] The front surface of the cutting tool is provided with fourteen irregularly shaped curved lines of the same shape. Each irregularly shaped curved line is formed by P2P1 curve, P1P4 curve, P4P3 curve and P3P2 curve connected smoothly from end to end to form a closed loop.

[0009] Along the length of the blade, with the axis of the blade length direction as the torsion axis, there is a torsion angle of 3°-8° between the cutting part and the mounting part. This torsion causes the non-torsion area of ​​the blade to produce adaptive linkage deformation, so that the entire blade and all the textures on the surface deform synchronously with the torsion, forming an asymmetrical blade structure.

[0010] Further defined, the overall dimensions of the tool are: length 118mm-122mm, width 88mm-92mm, and thickness 3.8mm-4.2mm. The cutting part is located at a cross-section 71mm-73mm away from the front surface of the tool, and the mounting part is located at the rear.

[0011] Further specified, the seven biomimetic fish fin patterns are arranged at equal intervals, with the spacing between adjacent patterns being 7.8mm-8.2mm, and the depth of each pattern ranging from 0.7mm to 0.9mm; the fourteen irregular curved patterns are arranged at equal intervals, with the spacing between adjacent patterns being 1.65mm-1.85mm, and the depth of each pattern ranging from 0.9mm to 1.1mm.

[0012] Furthermore, both the biomimetic fish fin pattern and the irregular curve pattern are symmetrically arranged about the longitudinal center of the blade before twisting, and adapt to the deformation of the blade synchronously after twisting.

[0013] Further specifying, the torsion angle is 5°.

[0014] Further specified, a circular bolt pre-drilled hole is provided between the top mounting surface and the bottom surface of the cutting tool, the diameter of the circular bolt pre-drilled hole is 16.5mm-17.5mm, and the distance between the center of the hole and the front surface of the cutting tool is 89mm-91mm.

[0015] Furthermore, the circular bolt pre-drilled hole adopts a hinged rotatable mounting structure, allowing the blade to rotate around the bolt and rotate with the cutter head to complete the cutting operation.

[0016] Furthermore, the material of the cutting tool is 65Mn spring steel, and it is integrally formed by laser cutting.

[0017] Further specifying, the curvature radius ranges of the biomimetic curves AB, BC, CD, DE, and EF are: R18mm-R28mm, R32mm-R45mm, R22mm-R38mm, R15mm-R25mm, and R8mm-R18mm, respectively; and the curvature radius ranges of the seven biomimetic fish fin patterns are:

[0018] A1B1 has a radius of R8.2mm-R15.6mm, and B1C1 has a radius of R6.5mm-R12.3mm;

[0019] A2B2 has a radius of R9.5mm-R18.2mm, and B2C2 has a radius of R7.8mm-R14.5mm;

[0020] A3B3 has a diameter of R10.8mm-R20.5mm, and B3C3 has a diameter of R8.9mm-R16.2mm.

[0021] A4 and B4 have R12.0mm-R22.8mm, while B4 and C4 have R10.0mm-R18.0mm.

[0022] A5 and B5 have R13.5mm-R25.0mm, while B5 and C5 have R11.2mm-R20.0mm.

[0023] A6 and B6 have R15.0mm-R28.0mm diameters, while B6 and C6 have R12.5mm-R22.5mm diameters.

[0024] A7 and B7 have R16.5mm-R30.5mm, while B7 and C7 have R14.0mm-R25.0mm.

[0025] The ranges of curvature radii of the irregular curve patterns are as follows:

[0026] P2P1 is R12mm-R28mm, P4P3 is R10mm-R25mm, P1P4 is R150mm-R250mm, and P3P2 is a straight line.

[0027] The advantages of this invention compared to the prior art are as follows:

[0028] 1. Through the synergistic effect of the biomimetic fish-shaped streamlined contour, biomimetic fish-fin patterns, and irregular curved patterns, the frictional resistance between the blade and the grass stalk is significantly reduced.

[0029] The 2.3°-8° torsion angle design optimizes the cutting angle into the soil, reduces the resistance of the tool movement, and the combination of biomimetic curves and torsion structure makes the cutting more stable, which is beneficial to the subsequent regeneration of alfalfa.

[0030] 3. The biomimetic fish fin pattern and irregular curve pattern on the surface of the blade can effectively guide the chopped material out and reduce the adhesion of juice and dirt. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0032] Figure 2 This is a schematic diagram of the top of the cutting tool of the present invention;

[0033] Figure 3 This is a schematic diagram of the torsion of the present invention;

[0034] Figure 4 This is a schematic diagram of the bottom of the present invention;

[0035] Figure 5 This is a schematic diagram of the irregular curved texture on the front surface of the cutting tool according to the present invention;

[0036] Figure 6 This is a schematic diagram of the tool mounting according to the present invention.

[0037] The markings in the diagram correspond to: 1-cutting section, 2-mounting section, 3-upper surface of the tool, 4-lower surface of the tool, 5-front surface of the tool, 6-left cutting surface, 7-right cutting surface, 8-left side of the mounting section, 9-right side of the mounting section, 10-rear surface of the tool, 11-top mounting surface, 12-bottom surface, 13-circular bolt pre-drilled hole, 14-irregular curved texture, 15-bionic fish fin texture. Detailed Implementation

[0038] To enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0039] Example:

[0040] like Figures 1-6As shown, a biomimetic alfalfa cutting tool includes an integrally formed cutting part 1 and a mounting part 2. The blade outline of the cutting part 1 is formed by at least four sequentially connected biomimetic curves AB, BE, EF, and FA to simulate the shape of a fish body. Curves AB and EF correspond to the main body of the fish and are convex arc-shaped. The outline of the mounting part 2 is formed by biomimetic curves BE, ED, DC, CG, and GH to simulate the shape of a fish tail fin. Curves BC and ED are the outer edges of the fish tail and are inwardly curved. Curves DC and CG are transition arcs, and curve GH is the outwardly curved rear edge of the tail fin. The cutting part 1 includes an upper surface 3, a lower surface 4, a front surface 5, a left cutting surface 6, and a right cutting surface 7. The mounting part 2 includes a left side surface 8, a right side surface 9, a rear surface 10, a top mounting surface 11, and a bottom surface 12.

[0041] The upper surface of the blade is decorated with seven biomimetic fish fin patterns 15, numbered from the first to the seventh. These seven patterns are evenly spaced, with a spacing of 7.8mm-8.2mm between adjacent patterns. The depth of each pattern ranges from 0.7mm to 0.9mm. The nth biomimetic fish fin pattern is a biomimetic curve AnB. n and BnC n The components are connected smoothly in sequence, n=1,2……7. The biomimetic fish fin pattern 15 simulates the streamlined structure of the fins of fish in nature, which is used to reduce the frictional resistance between the grass stalks and the blade surface during the cutting process, while guiding the chopped material to be discharged smoothly and preventing grass from getting tangled.

[0042] The origin is a point located on the longitudinal center plane of symmetry, at a distance of 60.932642 mm from the upper surface of the tool (before twisting). The positive x-axis runs from right to left, and the positive y-axis runs from front to back.

[0043] The specific equations for each curve are as follows:

[0044] First line:

[0045] A1B1:y=0.002792x³-0.052393x²+0.646700x—56.639415

[0046] B1C1: y=0.012975x²+0.233208x-52.420373

[0047] Second line:

[0048] A2B2: y=0.025479x²-0.028884x-47.149495

[0049] B2C2: y=-0.000393x³+0.023755x²+0.128742x-44.183572

[0050] The third line:

[0051] A3B3: y=0.001037x³-0.015846x²+0.346576x-40.222547

[0052] B3C3: y=0.010397x²+0.184187x-36.253705

[0053] Fourth line:

[0054] A4B4: y=0.000882x³-0.013830x²+0.347104x-32.220468

[0055] B4C4: y= -0.000236x³+0.017941x²+0.120534x-28.049845

[0056] Fifth line:

[0057] A5B5: y=0.000731x³-0.012240x²+0.366979x-24.205799

[0058] B5C5: y=-0.000200x³+0.015845x²+0.153206x-20.092495

[0059] The sixth line:

[0060] A6B6: y=0.000046x 4 -0.002069x³+0.044142x²-0.095977x-15.092789

[0061] B6C6: y=-0.000144x³+0.013486x²+0.150358x-12.093222

[0062] The seventh line:

[0063] A7B7: y=0.000573x³-0.011660x²+0.437561x-8.156441

[0064] B7C7: y=0.000012x 4 -0.000838x³+0.026640x²+0.087185x-3.948155

[0065] The front surface of the cutting tool is provided with fourteen irregularly shaped curved lines 14. Each irregularly shaped curved line 14 is formed by the P2P1 curve, P1P4 curve, P4P3 curve and P3P2 curve connected smoothly end to end to form a closed loop. The P2P1 curve is the left curve and is convex arc-shaped. The P1P4 curve is the upper curve and is approximately horizontal micro-arc-shaped. The P4P3 curve is the right curve and is concave arc-shaped. The P3P2 curve is the lower curve and is straight. The fourteen irregularly shaped curved lines are evenly spaced, with the spacing between adjacent lines being 1.65mm-1.85mm. The depth of each line ranges from 0.9mm to 1.1mm. This is used to further reduce the frictional resistance between the cutting surface and the grass stalks and improve the smoothness of the cut surface.

[0066] Taking the midpoint of the bottom line of the front surface of the tool (before twisting) as the origin, with the positive x-axis from right to left and the positive y-axis from bottom to top, the curve equation of this texture (taking the leftmost texture as an example) is as follows:

[0067] P2P1: x = 0.022953y 4 -0.022966y³-0.256979y²+0.203143y+11.810919

[0068] P1P4: x = 0.165057y + 11.107333

[0069] P4P3: x=-0.047940y³-0.093719y²+0.142266y+11.077535

[0070] P3P2: Y=0.292

[0071] Along the length of the blade, with the axis of the blade length as the torsion axis, there is a 5° torsion angle between the cutting part 1 and the mounting part 2. The biomimetic fish fin pattern 15 and the irregular curve pattern 14 are symmetrically arranged about the longitudinal center of the blade before the torsion. After the torsion, they adapt and deform synchronously with the blade. This torsion causes the non-torsion area of ​​the blade to produce adaptive linkage deformation, so that the entire blade and all the patterns on the surface deform synchronously with the torsion, forming an asymmetrical blade structure. This changes the contact angle between the cutting edge and the grass stem, which can effectively reduce cutting resistance and reduce power consumption.

[0072] The blade is made of 65Mn spring steel and is integrally formed by laser cutting. The overall dimensions are: length 118mm-122mm, width 88mm-92mm, and thickness 3.8mm-4.2mm. The blade is divided at a section 71mm-73mm from the front surface of the blade. The front part of the blade is the cutting part 1, and the rear part is the mounting part 2. A circular bolt hole 13 is provided between the top mounting surface 11 and the bottom surface 12 of the blade. The diameter of the circular bolt hole 13 is 16.5mm-17.5mm, and the distance between the center of the hole and the front surface 5 of the blade is 89mm-91mm. It can be adapted to the standard installation conditions of existing alfalfa harvesters. It adopts a hinged and rotatable installation structure. The blade can rotate around the bolt and rotate with the blade disc to complete the cutting operation.

[0073] During the cutting process, the asymmetrical torsional structure combined with the biomimetic contour allows for gradual cutting into the alfalfa stalks, changing the instantaneous force application of traditional flat-blade cutting. This results in a smoother cutting process, leaving a clean and smooth stubble that is less susceptible to pathogen invasion, effectively reducing the probability of mold growth on the alfalfa cut surface and promoting post-cut regeneration. During the cutting process, the biomimetic fish fin pattern 15 and the irregular curved pattern 14 work together to reduce frictional resistance and guide the cutting debris and sap outwards along the patterns, reducing debris entanglement and soil / sap adhesion to the blade surface. This keeps the blade surface clean during long-term operation, reducing the frequency of sharpening and maintenance, and improving harvesting efficiency. The cutting resistance is lower than that of traditional alfalfa cutting tools of the same size, resulting in lower power consumption. There is no significant entanglement or blockage of grass after the operation. The smoothness of the cut meets the requirements for high-quality alfalfa harvesting. It is compatible with the installation dimensions of existing harvesting equipment and can be directly replaced without equipment modification, making it highly adaptable.

[0074] The above provides a detailed description of a biomimetic alfalfa cutting tool provided by the present invention. The specific embodiments are only used to help understand the method and core ideas of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A biomimetic alfalfa cutting tool, characterized in that: The device includes an integrally formed cutting part (1) and a mounting part (2). The blade outline of the cutting part (1) is formed by at least four sequentially connected biomimetic curves AB, BE, EF, and FA to simulate the shape of a fish body. The outline of the mounting part (2) is formed by biomimetic curves BE, ED, DC, CG, and GH to simulate the shape of a fish tail fin. The cutting part (1) includes an upper surface (3), a lower surface (4), a front surface (5), a left cutting surface (6), and a right cutting surface (7). The mounting part (2) includes a left side surface (8), a right side surface (9), a rear surface (10), a top mounting surface (11), and a bottom surface (12). The upper surface (3) of the cutting tool is provided with seven biomimetic fish fin patterns (15), namely the first biomimetic fish fin pattern to the seventh biomimetic fish fin pattern, wherein the nth biomimetic fish fin pattern is a biomimetic curve A. n B n and B n C n The sequence is formed by a smooth connection, n=1,2……7; The front surface (5) of the cutting tool is provided with fourteen irregular curve patterns (14) of the same shape. Each irregular curve pattern is formed by P2P1 curve, P1P4 curve, P4P3 curve and P3P2 curve connected smoothly from end to end to form a closed loop. Along the length of the blade, with the axis of the blade length direction as the torsion axis, the cutting part (1) and the mounting part (2) are provided with a torsion angle of 3°-8°. This torsion causes the non-torsion area of ​​the blade to produce adaptive linkage deformation, so that the entire blade and all the textures on the surface deform synchronously with the torsion, forming an asymmetrical blade structure.

2. The biomimetic irregular alfalfa cutting tool according to claim 1, characterized in that: The overall dimensions of the cutting tool are: length 118mm-122mm, width 88mm-92mm, and thickness 3.8mm-4.2mm. The cutting part (1) is located at a distance of 71mm-73mm from the front surface of the cutting tool, and the mounting part (2) is located at the rear.

3. The biomimetic irregular alfalfa cutting tool according to claim 1, characterized in that: The seven biomimetic fish fin patterns (15) are arranged at equal intervals, with the spacing between adjacent patterns being 7.8mm-8.2mm and the depth of each pattern ranging from 0.7mm to 0.9mm; the fourteen irregular curve patterns (14) are arranged at equal intervals, with the spacing between adjacent patterns being 1.65mm-1.85mm and the depth of each pattern ranging from 0.9mm to 1.1mm.

4. The biomimetic irregular alfalfa cutting tool according to claim 1, characterized in that: The biomimetic fish fin pattern (15) and the irregular curve pattern (14) are symmetrically arranged about the longitudinal center of the blade before twisting, and adapt to the deformation of the blade after twisting.

5. The biomimetic irregular alfalfa cutting tool according to claim 1, characterized in that: The aforementioned torsion angle is 5°.

6. The biomimetic irregular alfalfa cutting tool according to claim 1, characterized in that... A circular bolt pre-drilled hole (13) is provided between the top mounting surface and the bottom surface of the cutting tool. The diameter of the circular bolt pre-drilled hole (13) is 16.5mm-17.5mm, and the distance between the center of the hole and the front surface of the cutting tool is 89mm-91mm.

7. The biomimetic irregular alfalfa cutting tool according to claim 6, characterized in that: The circular bolt pre-drilled hole (13) adopts a hinged rotatable mounting structure, and the blade can rotate around the bolt and rotate with the cutter head to complete the cutting operation.

8. The biomimetic irregular alfalfa cutting tool according to claim 1, characterized in that: The cutting tool is made of 65Mn spring steel and is integrally formed by laser cutting.

9. The biomimetic irregular alfalfa cutting tool according to claim 1, characterized in that: The curvature radius ranges of the biomimetic curves AB, BC, CD, DE, and EF are respectively: R18mm-R28mm, R32mm-R45mm, R22mm-R38mm, R15mm-R25mm, and R8mm-R18mm. The curvature radius ranges of the seven biomimetic fish fin patterns (15) are respectively: A1B1 has a radius of R8.2mm-R15.6mm, and B1C1 has a radius of R6.5mm-R12.3mm; A2B2 has a radius of R9.5mm-R18.2mm, and B2C2 has a radius of R7.8mm-R14.5mm; A3B3 has a diameter of R10.8mm-R20.5mm, and B3C3 has a diameter of R8.9mm-R16.2mm. A4 and B4 have R12.0mm-R22.8mm, while B4 and C4 have R10.0mm-R18.0mm. A5 and B5 have R13.5mm-R25.0mm, while B5 and C5 have R11.2mm-R20.0mm. A6 and B6 have R15.0mm-R28.0mm diameters, while B6 and C6 have R12.5mm-R22.5mm diameters. A7 and B7 have R16.5mm-R30.5mm, while B7 and C7 have R14.0mm-R25.0mm. The ranges of the curvature radii of the irregular curve texture (14) are as follows: P2P1 is R12mm-R28mm, P4P3 is R10mm-R25mm, P1P4 is R150mm-R250mm, and P3P2 is a straight line.

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