CN114698474B - Bionic special-shaped cutter for silage forage grass - Google Patents

Bionic special-shaped cutter for silage forage grass Download PDF

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Publication number
CN114698474B
CN114698474B CN202210378743.7A CN202210378743A CN114698474B CN 114698474 B CN114698474 B CN 114698474B CN 202210378743 A CN202210378743 A CN 202210378743A CN 114698474 B CN114698474 B CN 114698474B
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equal
edge
cutting surface
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CN114698474A (en
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王德成
王海翼
尤泳
惠云婷
金峤
王天一
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China Agricultural University
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China Agricultural University
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01F—PROCESSING OF HARVESTED PRODUCE; HAY OR STRAW PRESSES; DEVICES FOR STORING AGRICULTURAL OR HORTICULTURAL PRODUCE
    • A01F29/00—Cutting apparatus specially adapted for cutting hay, straw or the like
    • A01F29/09—Details
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01F—PROCESSING OF HARVESTED PRODUCE; HAY OR STRAW PRESSES; DEVICES FOR STORING AGRICULTURAL OR HORTICULTURAL PRODUCE
    • A01F29/00—Cutting apparatus specially adapted for cutting hay, straw or the like
    • A01F29/09—Details
    • A01F29/095—Mounting or adjusting of knives
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
    • Y02P60/80—Food processing, e.g. use of renewable energies or variable speed drives in handling, conveying or stacking
    • Y02P60/87—Re-use of by-products of food processing for fodder production

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  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Numerical Control (AREA)
  • Harvester Elements (AREA)

Abstract

The invention belongs to the technical field of agricultural machinery, and relates to a bionic special-shaped cutter for silage grass. The cutter comprises an upper cutter edge (1), a cutter back (2), a cutter tail (3), a lower cutter edge (4), a cutter head (5), a main cutting surface (6), an auxiliary cutting edge (7), a main cutting edge (8), a cutter tip (9), an installation surface (10), a first side surface I, a second side surface II and a lower curved surface III; the invention solves the problems of uneven cutting length, poor sharpening, poor reliability, large power consumption, poor silage quality and the like of the conventional cutting device of the silage harvester, improves the cutting quality and saves the cost. The bionic special-shaped chopping cutter utilizes the excellent cutting capability of the lower beaver incisors, can reduce cutting resistance and material slippage as much as possible when chopping silage raw materials, and finally achieves the purposes of saving labor and time and uniformly cutting, thereby reducing the energy consumption of the whole machine and improving the operation efficiency and quality.

Description

Bionic special-shaped cutter for silage forage grass
Technical Field
The invention relates to a bionic special-shaped cutting tool for silage forage grass, and belongs to the technical field of agricultural machinery.
Background
Currently, as the market demand for quality and quantity of meat and dairy products increases dramatically, the demand for feed raw materials, especially high quality roughages, increases dramatically. But the gap in silage supplies and demands is still large nationwide. The silage belongs to high-energy and crude fiber feed with high starch content, can be used for uniformly supplying fresh green succulent silage all the year round, and is essential basic feed for producing cattle, sheep and livestock products such as meat, milk and the like in the world. The biological yield is high, the digestible nutrition is more, the palatability is good, the preparation is convenient, the storage time is long, the nutrient loss rate is low, and the planting benefit is high, and the method is widely applied to the agriculture and animal husbandry production. The silage plays an important role in the feed intake speed of cattle and sheep, the stability of rumen microbial environment and body health, and has great development potential in the future development of animal husbandry in China.
However, the high-quality silage is still insufficient in the current stage of China, the gap rate of cattle and sheep is up to 46188 ten thousand tons only, and the gap rate is up to 83.2%, so that the research and development of a high-quality whole-plant silage grass harvesting machine can effectively relieve the contradiction between the rapid development of animal husbandry and silage shortage in recent years, and the cutting is used as a key link in the silage grass harvesting process and is closely related to the silage quality. A silage forage grass cutting tool is an auxiliary device used for cutting silage forage grass in the silage forage grass processing process. Present silage cuts up cutter mostly is dull and stereotyped straight sword, leans on the blade rotation to cut up the raw materials, and when raw materials toughness is higher, rotatory blade can cause the raw materials to slide, leads to the raw materials difficult quilt to be cut up, and the silage quality of making is relatively poor. And has the problems of uneven cutting length, poor sharpening effect, poor reliability, large power consumption and the like. Therefore, the bionic special-shaped cutter is designed, after being fed, the chopped silage forage grass is cut by continuous combination of a plurality of groups of heavy blades and then is cut by sliding cutting or shearing crushing, the contact surface of the material and the cutter is simultaneously cut by the plurality of groups of blades, the area of a cutting area is increased, the cutting resistance and the energy consumption are reduced, the cutter has high wear resistance, the forage grass stalks can be cut off at one time, and the operation efficiency of silage harvesting machines such as silage forage grass and the like is improved.
Disclosure of Invention
The invention aims to provide a silage bionic special-shaped shredding cutter aiming at high-toughness silage raw materials such as whole silage forage grass and the like, which has the advantages of simple structure, simple and convenient operation, economy, applicability and low cost.
In order to achieve the purpose, the invention provides the following technical scheme:
a silage bionic special-shaped chopping cutter comprises an upper cutter edge 1, a cutter back 2, a cutter tail 3, a lower cutter edge 4, a cutter head 5, a main cutting surface 6, an auxiliary cutting edge 7, a main cutting edge 8, a cutter point 9, an installation surface 10, a first side surface I, a second side surface II and a lower curved surface III;
one side of the front end of the mounting surface 10 is a tool nose 9, the other side of the front end of the mounting surface 10 is a tool bit 5, and a main cutting surface 6 is arranged between the tool nose 9 and the tool bit 5; the lower end of the main cutting surface 6 is provided with a secondary cutting edge 7, the upper end of the main cutting surface 6 is provided with a main cutting edge 8, and the main cutting edge 8 and the secondary cutting edge 7 are boundary curves of the main cutting surface 6 and are special-shaped bionic NURBS curves; the edge lines of the end faces on the two sides of the mounting surface 10 are respectively a knife upper edge 1 and a knife lower edge 4, wherein the knife upper edge 1 is positioned on the upper surface of the mounting surface 10, and the knife lower edge 4 is positioned on the lower surface of the mounting surface 10;
the rear end of the mounting surface 10 is a knife back 2, the tail end of the knife back 2 is a knife tail 3, and the knife tail 3 is a convex curved surface;
the upper edge 1, the lower edge 4, the tail 3 and the tool bit 5 form a first side surface I; a second side surface II is formed by the upper edge 1 of the knife, the lower edge 4 of the knife, the tail 3 of the knife and the knife tip 9;
the main cutting surface 6 is formed by enclosing a tool bit 5, a main cutting edge 8, an auxiliary cutting edge 7 and a tool nose 9, the main cutting edge 8 and the auxiliary cutting edge 7 are special-shaped bionic NURBS curves staggered at a certain angle, and the tool bit 5 is a straight edge at the bottom end boundary of a first side surface I of the tool and has a vertical shearing effect on materials;
the rear part of the front end of the mounting surface 10 is positioned at the rear end of the main cutting surface 6 and is a lower curved surface III of the cutter, a plurality of auxiliary cutting edges are arranged on the lower curved surface III, the auxiliary cutting edges and the main cutting edge 8 form a multi-cutting-edge combination, and each adjacent auxiliary cutting edge forms different auxiliary cutting surfaces; the auxiliary cutting surfaces are sequentially arranged on the lower curved surface III of the cutter by taking the main cutting edge 8 as a side boundary, each auxiliary cutting surface and the main cutting surface 6 are combined into different cutting pairs, and the main cutting surface 6 and all the auxiliary cutting surfaces form a cutting surface together;
each point A-V is the end point of each cutting surface boundary curve, W is the middle point of the arc line of the secondary cutting edge 7, and Z is the middle point of the arc line SC;
the face with the AIHU as the end point is the main cutting face 6; an arc AWI taking AI as an end point is taken as a secondary cutting edge 7, and an arc UQPH taking UH as an end point is taken as a primary cutting edge 8;
a surface with the SZC as an end point is taken as a first auxiliary cutting surface 12; the first secondary cutting surface 12 is in a special-shaped triangle shape, the first secondary cutting surface 12 is adjacent to the main cutting surface 6, an SZ section of the main cutting edge 8 is a bevel edge of the special-shaped triangle of the first secondary cutting surface 12, a ZC section of the main cutting edge 8 is another bevel edge of the special-shaped triangle of the first secondary cutting surface 12, and a bottom edge SC of the triangle of the first secondary cutting surface 12 is connected with the second secondary cutting surface 13;
the surface with the SCDT as the end point is a second auxiliary cutting surface 13; the second auxiliary cutting surface 13 is a special-shaped quadrangle, the bottom edge of the special-shaped triangle of the first auxiliary cutting surface 12 is the upper bottom edge SC of the special-shaped quadrangle of the second auxiliary cutting surface 13, and the lower bottom edge TD of the second auxiliary cutting surface 13 is connected with the third auxiliary cutting surface 14;
the face with TDRB as the end point is the third minor cutting face 14; the third auxiliary cutting surface 14 is a special-shaped quadrangle, the lower bottom edge of the special-shaped quadrangle of the second auxiliary cutting surface 13 is the upper bottom edge TD of the special-shaped quadrangle of the third auxiliary cutting surface 14, and the lower bottom edge BR of the third auxiliary cutting surface 14 is connected with the fourth auxiliary cutting surface 15;
the face with BRQU as the end point is the fourth minor cutting face 15; the fourth auxiliary cutting surface 15 is a special-shaped quadrangle, the lower bottom edge of the special-shaped quadrangle of the third auxiliary cutting surface 14 is the upper bottom edge BR of the special-shaped quadrangle of the fourth auxiliary cutting surface 15, and the lower bottom edge of the fourth auxiliary cutting surface 15 is connected with the fifth auxiliary cutting surface 16;
the face with UQPONV as the end point is the fifth minor cutting face 16; the fifth auxiliary cutting surface 16 is a special-shaped pentagon, the lower base of the special-shaped quadrangle of the fourth auxiliary cutting surface 15 is the upper base QU of the special-shaped pentagon of the fifth auxiliary cutting surface 16, the lower base VN of the special-shaped pentagon of the fifth auxiliary cutting surface 16 is connected to the main body of the lower curved surface III of the cutter, two side surfaces of the special-shaped pentagon of the fifth auxiliary cutting surface 16 are connected with the cutter head 5 and the first side surface I of the cutter and are intersected with the main cutting surface 6, and the intersection line is a QP section of the main cutting edge 8;
the tool nose 9 is a special-shaped triangle with HIJ as an end point, two side edges of the special-shaped triangle of the tool nose 9 are HI sections of the main cutting edge 8, and the other side edge is a straight line IJ; the bottom edge HJ of the special-shaped triangle of the tool nose 9 is connected with the ninth auxiliary cutting surface 20;
the face with HJKG as the end point is the ninth minor cutting face 20; the ninth auxiliary cutting surface 20 is a special-shaped quadrangle, the ninth auxiliary cutting surface 20 is closely adjacent to the tool nose 9, the bottom edge of the special-shaped triangle of the tool nose 9 is the upper bottom edge HJ of the special-shaped quadrangle of the ninth auxiliary cutting surface 20, and the lower bottom edge GK of the special-shaped quadrangle of the ninth auxiliary cutting surface 20 is connected with the eighth auxiliary cutting surface 19;
the surface having GKLF as the end point is the eighth minor cutting surface 19; the eighth cutting surface 19 is a special-shaped quadrangle, the lower bottom edge of the special-shaped quadrangle of the ninth cutting surface 20 is the upper bottom edge GK of the special-shaped quadrangle of the eighth cutting surface 19, and the lower bottom edge FL of the special-shaped quadrangle of the eighth cutting surface 19 is connected with the seventh cutting surface 18; one side edge of the quadrangle of the eighth minor cutting surface 19 is an FG section of the main cutting edge 8, and the other side edge is a straight line KL;
the face with FLME as the end point is the seventh minor cutting face 18; the seventh auxiliary cutting surface 18 is a special-shaped quadrangle, the lower bottom edge of the special-shaped quadrangle of the eighth cutting surface 19 is the upper bottom edge FL of the special-shaped quadrangle of the seventh auxiliary cutting surface 18, and the lower bottom edge EM of the special-shaped quadrangle of the seventh auxiliary cutting surface 18 is connected with the sixth auxiliary cutting surface 17; one side of the special-shaped quadrangle of the seventh auxiliary cutting surface 18 is an EF section of the main cutting edge 8, and the other side is a curve LM;
a surface whose end point is EMOP is the sixth minor cutting surface 17; the sixth auxiliary cutting surface 17 is a special-shaped quadrangle, the lower bottom edge of the special-shaped quadrangle of the seventh auxiliary cutting surface 18 is the upper bottom edge EM of the special-shaped quadrangle of the sixth auxiliary cutting surface 17, and the lower bottom edge PO of the sixth auxiliary cutting surface 17 is connected with the fifth auxiliary cutting surface 16; one side of the special-shaped quadrangle of the sixth secondary cutting surface 17 is a PE section of the main cutting edge 8, and the other side is a curve MO.
Establishing a space coordinate system o-xyz by taking the intersection point of the tangent line at the front end of the secondary cutting edge 7 and the tangent line of the first side boundary line as the center of a circle;
the surface equation of the main cutting surface 6 is: z =3.1696x +8.6325y + sin ((x ^2+ y ^ 2) × 7.5911), wherein x, y and z are coordinate values in a space coordinate system, x is more than or equal to 2.6737 and less than or equal to 36.5325, and y is more than or equal to 1.3526 and less than or equal to 29.7581;
the surface equation for the first minor cutting face 12 is: z ^2= x ^2/2.7326+ y ^2/4.1788, wherein x, y and z are coordinate values in a space coordinate system, x is more than or equal to 8.9633 and less than or equal to 32.7854, and y is more than or equal to 5.1452 and less than or equal to 31.0021;
the surface equation of the second secondary cutting surface 13 is: 1.2417xy (x ^ 2-0.2598) +6.5319 (2.2958y ^ 2) =0, wherein x, y and z are coordinate values in a space coordinate system, and x is more than or equal to 1.6647 and less than or equal to 38.4254, y is more than or equal to 3.2445 and less than or equal to 43.2784;
the surface equation for the third minor cutting face 14 is: 0.6157xy +3.9796y ^2-15.6218+ x ^2=0, wherein x, y and z are coordinate values in a space coordinate system, and x is more than or equal to 2.7848 and less than or equal to 37.6435, y is more than or equal to 8.2811 and less than or equal to 43.1051;
the curved surface equation of the fourth minor cutting surface 15 is: (x ^2+ 3.25x)/16.31 +1.2862y ^2= z, wherein x, y and z are coordinate values in a space coordinate system, x is more than or equal to 3.1175 and less than or equal to 37.5305, and y is more than or equal to 4.3396 and less than or equal to 63.1625;
the surface equation of the fifth minor cutting surface 16 is: (1/2 pi) × 5.4349x-6.0991y +3y ^2+12.39xy = z, wherein x, y and z are coordinate values in a space coordinate system, and x is more than or equal to 8.3201 and less than or equal to 34.5223, and y is more than or equal to 5.8633 and less than or equal to 37.4821;
the curved surface equation of the tool nose 9 is: 8.7917x ^2/14.8468-1.5304xy-7.9985y ^2= z, wherein x, y and z are coordinate values in a space coordinate system, and x is more than or equal to 0.6973 and less than or equal to 23.0197, and y is more than or equal to-13.8976 and less than or equal to 40.2932;
the surface equation for the ninth minor cutting surface 20 is: 17.3x2/(7.5159-z ^ 2) +3.5397xy-8.6272y ^ 2/(1.3091 z-2.61 y) =0, wherein x, y and z are coordinate values in a space coordinate system, and x is more than or equal to 9.0971 and less than or equal to 34.5229, and y is more than or equal to 8.2948 and less than or equal to 70.6158;
the curved surface equation of the eighth minor cutting surface 19 is: -9.65xy +12.0639y ^2+11.0021/x +8.51x ^2+19.48=0, wherein x, y and z are coordinate values in a space coordinate system, and x is more than or equal to 4.6171 and less than or equal to 33.9575, and y is more than or equal to 13.358 and less than or equal to 55.66822;
the surface equation of the seventh minor cutting surface 18: 4.5915x ^2+2.56xy/21.56+6.456y ^2= z, wherein x, y and z are coordinate values in a space coordinate system, x is more than or equal to 1.8925 and less than or equal to 30.7351, and y is more than or equal to 10.6532 and less than or equal to 29.9876;
the curved surface equation of the sixth minor cutting surface 17 is: (pi/2) × 2.2149x- (3.3214 x/pi) y + 10.19y2-21.7521xy = z, wherein x, y and z are coordinate values in a space coordinate system, and x is more than or equal to 1.7314 and less than or equal to 32.1941, and y is more than or equal to 20.65 and less than or equal to 19.2815.
Establishing an xy rectangular coordinate system by taking the tangent intersection point of the arc lines ha and bc as the circle center;
the main cutting edge 8 is a special-shaped bionic NURBS curve, and the mathematical expression of the curve is as follows: y =4 × 10 -5 x 4 -0.0176x 3 +2.7954x 2 –19.61x+51.2191，Wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 5.8468 and less than or equal to 14.3118;
the secondary cutting edge 7 is a special-shaped bionic NURBS curve, and the mathematical expression of the curve is as follows: y =3 × 10 -7 x 4 -8E-05x 3 +0.004x 2 +0.2886x-18.005, wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 0.1853 and is less than or equal to 18.2948;
the profile curve of the longitudinal section of the cutting surface is a special-shaped bionic NURBS curve ef, and the mathematical expression of the curve is as follows: y =1 × 10 -4 x 4 -0.001x 3 +0.65x 2 13.227x +10.0125, wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 2.9207 and less than or equal to 35.6012;
the knife edge 1 is a special-shaped bionic NURBS curve which consists of three segments of ah, hg and gf, and the mathematical expression of the curve of the ah segment is as follows: y = -0.0002x 4 +0.1977x 3 -0.4708x 2 +1.6108x-0.0216, wherein x and y are coordinate values in a rectangular coordinate system, x is more than or equal to 1.6737 and less than or equal to 21.7027, and the mathematical expression of the hg-segment curve is as follows: y =3 × 10-6x 4 -0.0043x 3 +2.2603x 2 -53.0198x +4.6689, wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 2.8218 and less than or equal to 24.3613, and the mathematical expression of a gf-segment curve is as follows: y = -3 × 10 -6 x 4 +0.0049x 3 -2.7596x 2 +6.9264x-6.4911, wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 3.3248 and less than or equal to 24.6857;
the lower edge 4 of the cutter is a special-shaped bionic NURBS curve which consists of two sections of cd and de, and the mathematical expression of the cd curve is as follows: y =0.0268x 4 +0.0185x 3 -8.7135x2+18.0752x-13.9268, wherein x and y are coordinate values in a rectangular coordinate system, and-2.4063 ≦ x ≦ 31.7326, the mathematical expression of the de curve is as follows: y =2 × 10-5x 4 -0.0344x 3 +18.447x 2 43.9614x +3.9239, wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 0.3653 and less than or equal to 28.4224;
the longitudinal section curve of the knife back 2 is a straight line, and the mathematical expression is as follows: y =0.0723x-1.8701, wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 2.6171 and less than or equal to 13.5149; the longitudinal section profile curve of the cutter tail 3 is a special-shaped bionic NURBS curve, and the mathematical expression is as follows: y = -8E-07x 4 +0.001x 3 -0.4352x 2 +86.348x-62.2419; wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to-1.8925 and less than or equal to 32.2956;
the longitudinal section profile of the tool bit 5 is a straight line, and the mathematical expression is as follows: y =3.1752x +6.3772; wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to-3.2026 and less than or equal to 38.6642.
A counter bore 11 is arranged on the mounting surface 10, the whole cutter is arranged between a cutter pad 22 and a cutter seat 21 of an external base in a wedge block mode through the counter bore 11 by using a bolt 23, the cutter pad 22 is provided with the counter bore, the cutter seat 21 is provided with a threaded bottom hole, and the cutter seat 21 is fixedly connected to a matched external roller; the mounting angle of the silage bionic special-shaped chopping cutter is adjusted by adapting the cutter pad 22 and the cutter seat 21 with different hole opening directions.
The thickness of the cutter head 5 is 6mm.
Compared with the prior art, the invention has the beneficial effects that:
the invention solves the problems of uneven cutting length, poor sharpening, poor reliability, large power consumption, poor silage quality and the like of the conventional cutting device of the silage harvester, improves the cutting quality and saves the cost.
The bionic special-shaped chopping cutter utilizes the excellent cutting capability of the lower beaver incisors, can reduce cutting resistance and material slippage as much as possible when chopping silage raw materials, and finally achieves the purposes of saving labor and time and uniformly cutting, thereby reducing the energy consumption of the whole machine and improving the operation efficiency and quality.
Drawings
FIG. 1 is an isometric view of a bionic, profiled silage cutter of the present invention;
FIG. 2 is a schematic rear view of a bionic special-shaped silage cutter of the present invention;
FIG. 3 is a front schematic view of a bionic specially shaped cutting tool for silage of the present invention;
FIG. 4 is a schematic front view of a cutter marked with characteristic points of curved segments for cutting the bionic special-shaped silage forage grass according to the invention;
FIG. 5 isbase:Sub>A sectional view taken along line A-A of FIG. 1;
FIG. 6 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 7 is a side view of one side of the cutting head 9 of the bionic profiled silage cutter of the present invention;
fig. 8 is a schematic structural view of the silage grass bionic special-shaped chopping cutter and an external cutter holder used in cooperation.
Wherein the reference numerals are:
1. edge 2 and back of knife
3. Knife tail 4 and knife lower edge
5. Tool bit 6, main cutting surface
7. Minor cutting edge 8, major cutting edge
9. Cutting edge 10 and mounting surface
11. Counter bore 12, first minor cutting face
13. Second minor cutting face 14, third minor cutting face
15. Fourth minor cutting face 16, fifth minor cutting face
17. Sixth minor cutting face 18, seventh minor cutting face
19. Eighth minor cutting face 20, ninth minor cutting face
21. Tool apron 22 and tool pad
23. Bolt I, first side
II, a second side surface III and a lower curved surface
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
As shown in fig. 1-7, a silage bionic special-shaped shredding cutter comprises a cutter upper edge 1, a cutter back 2, a cutter tail 3, a cutter lower edge 4, a cutter head 5, a main cutting surface 6, an auxiliary cutting edge 7, a main cutting edge 8, a cutter tip 9, a mounting surface 10, a counter bore 11, a first side surface I, a second side surface II and a lower curved surface III.
One side of the front end of the mounting surface 10 is a tool nose 9, the other side of the front end of the mounting surface 10 is a tool bit 5, and a main cutting surface 6 is arranged between the tool nose 9 and the tool bit 5; the lower end of the main cutting face 6 is an auxiliary cutting edge 7, the upper end of the main cutting face 6 is a main cutting edge 8, and boundary curves of the main cutting edge 8 and the auxiliary cutting edge 7 which are the main cutting face 6 are special-shaped bionic NURBS curves. The end face borderlines on both sides of the mounting surface 10 are respectively a knife upper edge 1 and a knife lower edge 4, wherein the knife upper edge 1 is positioned on the upper surface of the mounting surface 10, and the knife lower edge 4 is positioned on the lower surface of the mounting surface 10.
The rear end of the mounting surface 10 is a knife back 2, the tail end of the knife back 2 is a knife tail 3, and the knife tail 3 is a convex curved surface.
The upper edge 1, the lower edge 4, the tail 3 and the tool bit 5 form a first side surface I; the upper edge 1, the lower edge 4, the tail 3 and the tool tip 9 form a second side surface II.
The main cutting face 6 is enclosed by tool bit 5, main cutting edge 8, vice cutting edge 7 and knife tip 9 and closes and forms, and main cutting edge 8 and vice cutting edge 7 are the bionical NURBS curve of dysmorphism that certain angle is crisscross, and tool bit 5 is the straight sword of I bottom boundary in the first side of cutter, has the vertical shear effect to the material.
The front end rear part of the mounting surface 10 is positioned at the rear end of the main cutting surface 6 and is a lower curved surface III of the cutter, a plurality of auxiliary cutting edges are arranged on the lower curved surface III, the auxiliary cutting edges and the main cutting edge 8 form a multi-cutting-edge combination, and each adjacent auxiliary cutting edge forms different auxiliary cutting surfaces. The auxiliary cutting surfaces are sequentially arranged on the lower curved surface III of the cutter by taking the main cutting edge 8 as a side boundary, each auxiliary cutting surface can be combined with the main cutting surface 6 into different cutting pairs, and the main cutting surface 6 and all the auxiliary cutting surfaces form a cutting surface together.
Fig. 3 is a front schematic view of the bionic special-shaped cutting tool for silage grass of the invention. In fig. 3, a spatial coordinate system o-xyz is established with the intersection of the tangent to the tip end of the minor cutting edge 7 and the tangent to the first side surface boundary line as the center.
Fig. 4 is a front schematic view of the bionic special-shaped silage grass chopping cutter marked with curve section characteristic points. Points A-V are the end points of the boundary curve of each cutting face, W is the middle point of the arc line of the secondary cutting edge 7, and Z is the middle point of the arc line SC.
In fig. 4, the face with AIHU as the end point is the main cutting face 6. An arc AWI with AI as an end point is used as the minor cutting edge 7, and an arc UQPH with UH as an end point is used as the major cutting edge 8. The surface equation of the main cutting surface 6 is: z =3.1696x +8.6325y + sin ((x ^2+ y ^ 2) × 7.5911), wherein x, y and z are coordinate values in a space coordinate system, x is more than or equal to 2.6737 and less than or equal to 36.5325, and y is more than or equal to 1.3526 and less than or equal to 29.7581.
In fig. 4, a surface having SZC as an end point is a first sub-cut surface 12. The first minor cutting face 12 is a special-shaped triangle, the first minor cutting face 12 is adjacent to the main cutting face 6, the SZ section of the main cutting edge 8 is one oblique side of the special-shaped triangle of the first minor cutting face 12, the ZC section of the main cutting edge 8 is the other oblique side of the special-shaped triangle of the first minor cutting face 12, and the bottom side SC of the triangle of the first minor cutting face 12 is connected with the second minor cutting face 13. The surface equation for the first minor cutting face 12 is: z ^2= x ^2/2.7326+ y ^2/4.1788, wherein x, y and z are coordinate values in a space coordinate system, and x is more than or equal to 8.9633 and less than or equal to 32.7854, and y is more than or equal to 5.1452 and less than or equal to 31.0021.
In fig. 4, a surface having the SCDT as an end point is the second sub-cutting surface 13. The second minor cutting surface 13 is a heteromorphic quadrangle, the base of the heteromorphic triangle of the first minor cutting surface 12 is the upper base SC of the heteromorphic quadrangle of the second minor cutting surface 13, and the lower base TD of the second minor cutting surface 13 is connected with the third minor cutting surface 14. The surface equation of the second minor cutting surface 13 is: 1.2417xy (x ^ 2-0.2598) +6.5319 (2.2958y ^ 2) =0, wherein x, y and z are coordinate values in a space coordinate system, and 1.6647 ≦ x ≦ 38.4254,3.2445 ≦ y ≦ 43.2784.
In fig. 4, the surface having TDRB as an end point is the third minor cutting surface 14. The third sub-cutting surface 14 is a heteromorphic quadrangle, the lower base of the heteromorphic quadrangle of the second sub-cutting surface 13 is the upper base TD of the heteromorphic quadrangle of the third sub-cutting surface 14, and the lower base BR of the third sub-cutting surface 14 is connected with the fourth sub-cutting surface 15. The surface equation of the third minor cutting surface 14 is: 0.6157xy +3.9796y ^2-15.6218+ x ^2=0, wherein x, y and z are coordinate values in a space coordinate system, and x is more than or equal to 2.7848 and less than or equal to 37.6435, y is more than or equal to 8.2811 and less than or equal to 43.1051.
In fig. 4, a face with BRQU as an end point is the fourth minor cutting face 15. The fourth minor cutting surface 15 is a heteromorphic quadrilateral, the lower base edge of the heteromorphic quadrilateral of the third minor cutting surface 14 is the upper base edge BR of the heteromorphic quadrilateral of the fourth minor cutting surface 15, and the lower base edge of the fourth minor cutting surface 15 is connected with the fifth minor cutting surface 16. The curved surface equation of the fourth minor cutting surface 15 is: (x ^2+ 3.25x)/16.31 +1.2862y ^2= z, wherein x, y and z are coordinate values in a space coordinate system, x is more than or equal to 3.1175 and less than or equal to 37.5305, and y is more than or equal to 4.3396 and less than or equal to 63.1625.
In fig. 4, the surface with UQPONV as an end point is the fifth minor cutting surface 16. The fifth auxiliary cutting surface 16 is a special-shaped pentagon, the lower base edge of the special-shaped quadrangle of the fourth auxiliary cutting surface 15 is the upper base edge QU of the special-shaped pentagon of the fifth auxiliary cutting surface 16, the lower base edge VN of the special-shaped pentagon of the fifth auxiliary cutting surface 16 is connected to the main body of the lower curved surface III of the cutter, two side surfaces of the special-shaped pentagon of the fifth auxiliary cutting surface 16 are connected with the cutter head 5 and the first side surface I of the cutter and are intersected with the main cutting surface 6, and the intersection line is a QP section of the main cutting edge 8. The surface equation of the fifth minor cutting surface 16 is: (1/2 pi) { 5.4349x-6.0991y + } 3y ^2+12.39xy = z, wherein x, y and z are coordinate values in a space coordinate system, and x is more than or equal to 8.3201 and less than or equal to 34.5223, and y is more than or equal to 5.8633 and less than or equal to 37.4821.
In fig. 4, the cutting tip 9 is a special-shaped triangle with HIJ as an end point, two sides of the special-shaped triangle of the cutting tip 9 are HI sections of the main cutting edge 8, and the other side is a straight line IJ. The bottom HJ of the special triangle of the cutting tip 9 is connected to the ninth minor cutting surface 20. The curved surface equation of the tool nose 9 is: 8.7917x 2/14.8468-1.5304xy-7.9985y 2 ^2= z, wherein x, y and z are coordinate values in a space coordinate system, x is more than or equal to 0.6973 and less than or equal to 23.0197, and y is more than or equal to 0.8976 and less than or equal to 40.2932.
In fig. 4, the surface having HJKG as an end point is the ninth minor cutting surface 20. The ninth auxiliary cutting surface 20 is a special-shaped quadrangle, the ninth auxiliary cutting surface 20 is close to the tool nose 9, the bottom edge of the special-shaped triangle of the tool nose 9 is the upper bottom edge HJ of the special-shaped quadrangle of the ninth auxiliary cutting surface 20, and the lower bottom edge GK of the special-shaped quadrangle of the ninth auxiliary cutting surface 20 is connected with the eighth auxiliary cutting surface 19. The surface equation for the ninth minor cutting surface 20 is: 17.3x2/(7.5159-z ^ 2) +3.5397xy-8.6272y ^ 2/(1.3091 z-2.61 y) =0, wherein x, y and z are coordinate values in a space coordinate system, and x is more than or equal to 9.0971 and less than or equal to 34.5229, and y is more than or equal to 8.2948 and less than or equal to 70.6158.
In fig. 4, the surface having GKLF as the end point is the eighth minor cutting surface 19. The eighth cutting surface 19 is a heteromorphic quadrilateral, the lower base of the heteromorphic quadrilateral of the ninth cutting surface 20 is the upper base GK of the heteromorphic quadrilateral of the eighth cutting surface 19, and the lower base FL of the heteromorphic quadrilateral of the eighth cutting surface 19 is connected with the seventh cutting surface 18. One side of the quadrangle of the eighth minor cutting surface 19 is the FG section of the main cutting edge 8, and the other side is a straight line KL. The curved surface equation of the eighth minor cutting surface 19 is: -9.65xy +12.0639y ^2+11.0021/x +8.51x ^2+19.48=0, wherein x, y and z are coordinate values in a space coordinate system, and x is more than or equal to 4.6171 and less than or equal to 33.9575, and y is more than or equal to 13.358 and less than or equal to 55.66822.
In fig. 4, the face with FLME as the end point is the seventh minor cutting face 18. The seventh minor cutting surface 18 is a heteromorphic quadrangle, the lower base edge of the heteromorphic quadrangle of the eighth cutting surface 19 is the upper base edge FL of the heteromorphic quadrangle of the seventh minor cutting surface 18, and the lower base edge EM of the heteromorphic quadrangle of the seventh minor cutting surface 18 is connected with the sixth minor cutting surface 17. One side of the trapezium of the seventh minor cutting surface 18 is the EF-section of the main cutting edge 8, the other side is the curve LM (the section of the curve EF in fig. 7). The surface equation of the seventh minor cutting surface 18: 4.5915x ^2+2.56xy/21.56+6.456y ^2= z, wherein x, y and z are coordinate values in a space coordinate system, x is more than or equal to 1.8925 and less than or equal to 30.7351, and y is more than or equal to 10.6532 and less than or equal to 29.9876.
In fig. 4, a surface having EMOP as an end point is the sixth minor cutting surface 17. The sixth minor cutting surface 17 is a heteromorphic quadrangle, the lower base edge of the heteromorphic quadrangle of the seventh minor cutting surface 18 is the upper base edge EM of the heteromorphic quadrangle of the sixth minor cutting surface 17, and the lower base edge PO of the sixth minor cutting surface 17 is connected with the fifth minor cutting surface 16. One side of the special-shaped quadrangle of the sixth secondary cutting surface 17 is a PE section of the main cutting edge 8, and the other side is a curve MO. The curved surface equation of the sixth minor cutting surface 17 is: (pi/2) × 2.2149x- (3.3214 x/pi) y + 10.19y2-21.7521xy = z, wherein x, y and z are coordinate values in the space coordinate system, and x is more than or equal to 1.7314 and less than or equal to 32.1941, and y is more than or equal to 20.65 and less than or equal to 19.2815.
Fig. 7 is a side view of one side of the cutter head 9 of the bionic special-shaped silage grass chopping cutter, and an xy rectangular coordinate system is established by taking the intersection point of tangent lines of arc lines ha and bc as the center of a circle.
The main cutting edge 8 is a special-shaped bionic NURBS curve, and the mathematical expression of the curve is as follows: y =4 × 10 -5 x 4 -0.0176x 3 +2.7954x 2 -19.61x +51.2191, wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 5.8468 and less than or equal to 14.3118.
The secondary cutting edge 7 is a special-shaped bionic NURBS curve, and the mathematical expression of the curve is as follows: y =3 × 10 -7 x 4 -8E-05x 3 +0.004x 2 +0.2886x-18.005, wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 0.1853 and is less than or equal to 18.2948.
The profile curve of the longitudinal section of the cutting surface is a special-shaped bionic NURBS curve ef, and the mathematical expression of the curve is as follows: y =1 × 10 -4 x 4 -0.001x 3 +0.65x 2 13.227x +10.0125, wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 2.9207 and less than or equal to 35.6012.
Further, the knife edge 1 is a special-shaped bionic NURBS curve, the curve is composed of three segments of ah, hg and gf, and the mathematical expression of the curve of the ah segment is as follows: y = -0.0002x 4 +0.1977x 3 -0.4708x 2 +1.6108x-0.0216, where x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 1.6737 and less than or equal to 21.7027, the mathematical expression of the hg-segment curve is: y =3 × 10-6x 4 -0.0043x 3 +2.2603x 2 53.0198x +4.6689, wherein x and y are coordinate values in a rectangular coordinate system, and the mathematical expression of the curve of gf section is that x is more than or equal to 2.8218 and less than or equal to 24.3613: y = -3 × 10 -6 x 4 +0.0049x 3 -2.7596x 2 +6.9264x-6.4911, wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 3.3248 and less than or equal to 24.6857.
The lower edge 4 of the cutter is a special-shaped bionic NURBS curve which consists of two sections of cd and de, and the mathematical expression of the cd curve is as follows: y =0.0268x 4 +0.0185x 3 -8.7135x2+18.0752x-13.9268, wherein x and y are coordinate values in a rectangular coordinate system, and-2.4063 ≦ x ≦ 31.7326, the mathematical expression of the de curve is as follows: y =2 × 10-5x 4 -0.0344x 3 +18.447x 2 43.9614x +3.9239, wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 0.3653 and less than or equal to 28.4224.
Further, the longitudinal section curve of the knife back 2 is a straight line, and the mathematical expression is as follows: y =0.0723x-1.8701, wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 2.6171 and less than or equal to 13.5149; the longitudinal section profile curve of the cutter tail 3 is a special-shaped bionic NURBS curve, and the mathematical expression is as follows: y = -8E-07x 4 +0.001x 3 -0.4352x 2 +86.348x-62.2419; wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to-1.8925 and less than or equal to 32.2956.
Further, the longitudinal section profile of the cutter head 5 is a straight line, and the mathematical expression is as follows: y =3.1752x +6.3772; wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to-3.2026 and less than or equal to 38.6642.
As shown in figure 8, the silage bionic special-shaped chopping cutter has a plurality of cutting tools which are movably connected with an external cutter holder for use. The mounting surface 10 is provided with a counter bore 11, the whole cutter is arranged between a cutter pad 22 and a cutter seat 21 of an external base in a wedge block mode through the counter bore 11 by a bolt 23, the cutter pad 22 is provided with the counter bore, the cutter seat 21 is provided with a threaded bottom hole, and the cutter seat 21 is fixedly connected to a matched external roller. The mounting angle of the silage bionic special-shaped chopping cutter is adjusted by adapting the cutter pad 22 and the cutter seat 21 with different hole opening directions.
Preferably, the thickness of the cutting head 5 is 6mm. The thickness of the tool bit is designed under the condition of meeting the requirement of strength stress, reducing the weight as much as possible and meeting the durability after stress analysis.
The working principle of the invention is as follows:
the invention relates to a NURBS bionic special-shaped chopping cutter based on lower beaver incisors, which consists of a main cutting surface, an auxiliary cutting surface, a lower curved surface III and a mounting surface 10, wherein each surface is a NURBS curved surface. The main cutting surface 6 is a special-shaped bionic NURBS curved surface and is provided with a main cutting edge 8 and an auxiliary cutting edge 7; the auxiliary cutting surface is a combined curved surface and consists of a plurality of connected auxiliary cutting surfaces; the mounting surface 10 is a cutter upper curved surface and is a complete special-shaped bionic NURBS curved surface, the mounting surface 10 is connected with a side surface, the side surface is formed by connecting a plurality of special-shaped bionic NURBS curves, and each special-shaped bionic NURBS curve is obtained by optimizing and fitting biological characteristics of lower dents of castors; the tool mounting surface 10 is provided with a counter bore 11 for connecting a tool pad 22 externally connected with the base and a tool holder 21. The fed materials such as the whole silage grass and the like are contacted with the cutting surface of the cutter to generate a plurality of contact surfaces, and the materials adjacent to the contact surfaces are simultaneously cut by a plurality of groups of cutting edges and are cut by sliding cutting or shearing. The cutting resistance and the energy consumption are reduced, the self-sharpening capability is realized to a certain degree, the straw can be cut off at one time, and the operating efficiency of the silage harvesting machines such as silage forage grass is effectively improved.

Claims (3)

1. The utility model provides a bionical special-shaped shredding cutter of silage forage grass which characterized in that: the cutter comprises a cutter upper edge (1), a cutter back (2), a cutter tail (3), a cutter lower edge (4), a cutter head (5), a main cutting surface (6), an auxiliary cutting edge (7), a main cutting edge (8), a cutter tip (9), an installation surface (10), a first side surface I, a second side surface II and a lower curved surface III;
one side of the front end of the mounting surface (10) is a tool nose (9), the other side of the front end of the mounting surface (10) is a tool bit (5), and a main cutting surface (6) is arranged between the tool nose (9) and the tool bit (5); the lower end of the main cutting surface (6) is provided with a secondary cutting edge (7), the upper end of the main cutting surface (6) is provided with a main cutting edge (8), and the main cutting edge (8) and the secondary cutting edge (7) are boundary curves of the main cutting surface (6) and are special-shaped bionic NURBS curves; the edge lines of the end faces on two sides of the mounting surface (10) are respectively an upper knife edge (1) and a lower knife edge (4), wherein the upper knife edge (1) is positioned on the upper surface of the mounting surface (10), and the lower knife edge (4) is positioned on the lower surface of the mounting surface (10);
the rear end of the mounting surface (10) is a knife back (2), the tail end of the knife back (2) is a knife tail (3), and the knife tail (3) is a convex curved surface;
the upper edge (1) of the knife, the lower edge (4) of the knife, the tail (3) of the knife and the knife head (5) form a first side surface I; a second side surface II is formed by the upper edge (1), the lower edge (4), the tail (3) and the tool tip (9);
the main cutting surface (6) is formed by enclosing a tool bit (5), a main cutting edge (8), an auxiliary cutting edge (7) and a tool nose (9), the main cutting edge (8) and the auxiliary cutting edge (7) are special-shaped bionic NURBS curves staggered at a certain angle, and the tool bit (5) is a straight edge at the bottom end boundary of a first side surface I of the tool and has a vertical shearing effect on materials;
the rear part of the front end of the mounting surface (10) is positioned at the rear end of the main cutting surface (6) and is a lower curved surface III of the cutter, a plurality of auxiliary cutting edges are arranged on the lower curved surface III, the auxiliary cutting edges and the main cutting edge (8) form a multi-cutting-edge combination, and each adjacent auxiliary cutting edge forms a different auxiliary cutting surface; the auxiliary cutting surfaces are sequentially arranged on the lower curved surface III of the cutter by taking the main cutting edge (8) as a side boundary, each auxiliary cutting surface and the main cutting surface (6) are combined into different cutting pairs, and the main cutting surface (6) and all the auxiliary cutting surfaces form a cutting surface together;
each point A-V is an end point of each cutting surface boundary curve, W is an arc line midpoint of the secondary cutting edge (7), and Z is a midpoint of an arc line SC;
a face with AIHU as an end point is used as a main cutting face (6); an arc AWI taking AI as an end point is taken as a secondary cutting edge (7), and an arc UQPH taking UH as an end point is taken as a main cutting edge (8);
the surface with the SZC as an end point is taken as a first auxiliary cutting surface (12); the first auxiliary cutting surface (12) is in a special-shaped triangle shape, the first auxiliary cutting surface (12) is close to the main cutting surface (6), the SZ section of the main cutting edge (8) is one oblique side of the special-shaped triangle of the first auxiliary cutting surface (12), the ZC section of the main cutting edge (8) is the other oblique side of the special-shaped triangle of the first auxiliary cutting surface (12), and the bottom edge SC of the triangle of the first auxiliary cutting surface (12) is connected with the second auxiliary cutting surface (13);
a surface with the SCDT as an end point is a second auxiliary cutting surface (13); the second auxiliary cutting surface (13) is a special-shaped quadrangle, the bottom edge of the special-shaped triangle of the first auxiliary cutting surface (12) is the upper bottom edge SC of the special-shaped quadrangle of the second auxiliary cutting surface (13), and the lower bottom edge TD of the second auxiliary cutting surface (13) is connected with the third auxiliary cutting surface (14);
a surface with TDRB as an end point is a third auxiliary cutting surface (14); the third auxiliary cutting surface (14) is a special-shaped quadrangle, the lower bottom edge of the special-shaped quadrangle of the second auxiliary cutting surface (13) is the upper bottom edge TD of the special-shaped quadrangle of the third auxiliary cutting surface (14), and the lower bottom edge BR of the third auxiliary cutting surface (14) is connected with the fourth auxiliary cutting surface (15);
the face with BRQU as the end point is a fourth minor cutting face (15); the fourth auxiliary cutting surface (15) is a special-shaped quadrangle, the lower bottom edge of the special-shaped quadrangle of the third auxiliary cutting surface (14) is the upper bottom edge BR of the special-shaped quadrangle of the fourth auxiliary cutting surface (15), and the lower bottom edge of the fourth auxiliary cutting surface (15) is connected with the fifth auxiliary cutting surface (16);
a surface with UQPONV as an end point is a fifth auxiliary cutting surface (16); the fifth auxiliary cutting surface (16) is an irregular pentagon, the lower base edge of the irregular quadrangle of the fourth auxiliary cutting surface (15) is the upper base edge QU of the irregular pentagon of the fifth auxiliary cutting surface (16), the lower base edge VN of the irregular pentagon of the fifth auxiliary cutting surface (16) is connected with a main body of a lower curved surface III of the cutter, two side surfaces of the irregular pentagon of the fifth auxiliary cutting surface (16) are connected with the cutter head (5) and the first side surface I of the cutter and are intersected with the main cutting surface (6), and the intersection line is a QP section of the main cutting edge (8);
the tool nose (9) is a special-shaped triangle with HIJ as an end point, two sides of the special-shaped triangle of the tool nose (9) are HI sections of the main cutting edge (8), and the other side is a straight line IJ; the bottom edge HJ of the special-shaped triangle of the tool nose (9) is connected with the ninth auxiliary cutting surface (20);
the surface taking the HJKG as an end point is a ninth auxiliary cutting surface (20); the ninth auxiliary cutting surface (20) is a special-shaped quadrangle, the ninth auxiliary cutting surface (20) is close to the cutter point (9), the bottom edge of the special-shaped triangle of the cutter point (9) is the upper bottom edge HJ of the special-shaped quadrangle of the ninth auxiliary cutting surface (20), and the lower bottom edge GK of the special-shaped quadrangle of the ninth auxiliary cutting surface (20) is connected with the eighth auxiliary cutting surface (19);
a surface with GKLF as an end point is an eighth auxiliary cutting surface (19); the eighth auxiliary cutting surface (19) is a special-shaped quadrangle, the lower bottom edge of the special-shaped quadrangle of the ninth auxiliary cutting surface (20) is the upper bottom edge GK of the special-shaped quadrangle of the eighth auxiliary cutting surface (19), and the lower bottom edge FL of the special-shaped quadrangle of the eighth auxiliary cutting surface (19) is connected with the seventh auxiliary cutting surface (18); one side edge of the quadrangle of the eighth secondary cutting surface (19) is an FG section of the main cutting edge (8), and the other side edge is a straight line KL;
a face with FLME as an end point is a seventh auxiliary cutting face (18); the seventh auxiliary cutting surface (18) is a special-shaped quadrangle, the lower bottom edge of the special-shaped quadrangle of the eighth auxiliary cutting surface (19) is the upper bottom edge FL of the special-shaped quadrangle of the seventh auxiliary cutting surface (18), and the lower bottom edge EM of the special-shaped quadrangle of the seventh auxiliary cutting surface (18) is connected with the sixth auxiliary cutting surface (17); one side edge of the special-shaped quadrangle of the seventh auxiliary cutting surface (18) is an EF section of the main cutting edge (8), and the other side edge is a curve LM;
a surface with EMOP as an end point is a sixth secondary cutting surface (17); the sixth auxiliary cutting surface (17) is a special-shaped quadrangle, the lower bottom edge of the special-shaped quadrangle of the seventh auxiliary cutting surface (18) is the upper bottom edge EM of the special-shaped quadrangle of the sixth auxiliary cutting surface (17), and the lower bottom edge PO of the sixth auxiliary cutting surface (17) is connected with the fifth auxiliary cutting surface (16); one side edge of the special-shaped quadrangle of the sixth auxiliary cutting surface (17) is a PE section of the main cutting edge (8), and the other side edge is a curve MO;
establishing a space coordinate system o-xyz by taking the intersection point of the tangent of the front tail end of the secondary cutting edge (7) and the tangent of the boundary line of the first side surface as the center of a circle;
the curved surface equation of the main cutting surface (6) is as follows: z =3.1696x +8.6325y + sin ((x ^2+ y ^ 2) × 7.5911), wherein x, y and z are coordinate values in a space coordinate system, x is more than or equal to 2.6737 and less than or equal to 36.5325, and y is more than or equal to 1.3526 and less than or equal to 29.7581;
the surface equation of the first minor cutting surface (12) is: z ^2= x ^2/2.7326+ y ^2/4.1788, wherein x, y and z are coordinate values in a space coordinate system, x is more than or equal to 8.9633 and less than or equal to 32.7854, and y is more than or equal to 5.1452 and less than or equal to 31.0021;
the curved surface equation of the second secondary cutting surface (13) is as follows: 1.2417xy (x ^ 2-0.2598) +6.5319 (2.2958y ^ 2) =0, wherein x, y and z are coordinate values in a space coordinate system, and x is more than or equal to 1.6647 and less than or equal to 38.4254, and y is more than or equal to 3.2445 and less than or equal to 43.2784;
the curved surface equation of the third secondary cutting surface (14) is as follows: 0.6157xy +3.9796y ^2-15.6218+ x ^2=0, wherein x, y and z are coordinate values in a space coordinate system, and x is more than or equal to 2.7848 and less than or equal to 37.6435, y is more than or equal to 8.2811 and less than or equal to 43.1051;
the curved surface equation of the fourth minor cutting surface (15) is: (x ^2+ 3.25x)/16.31 +1.2862y ^2= z, wherein x, y and z are coordinate values in a space coordinate system, x is more than or equal to 3.1175 and less than or equal to 37.5305, and y is more than or equal to 4.3396 and less than or equal to 63.1625;
the curved surface equation of the fifth secondary cutting surface (16) is as follows: (1/2 pi) { 5.4349x-6.0991y + } 3y ^2+12.39xy = z, wherein x, y and z are coordinate values in a space coordinate system, and x is more than or equal to 8.3201 and less than or equal to 34.5223, and y is more than or equal to 5.8633 and less than or equal to 37.4821;
the curved surface equation of the tool nose (9) is as follows: 8.7917x 2/14.8468-1.5304xy-7.9985y 2 ^2= z, wherein x, y and z are coordinate values in a space coordinate system, x is more than or equal to 0.6973 and less than or equal to 23.0197, and y is more than or equal to 0.8976 and less than or equal to 40.2932;
the curved surface equation of the ninth secondary cutting surface (20) is as follows: 17.3x2/(7.5159-z 2) +3.5397xy-8.6272y 2/(1.3091 z-2.61 y) =0, wherein x, y and z are coordinate values in a space coordinate system, and x is more than or equal to 9.0971 and less than or equal to 34.5229, y is more than or equal to 8.2948 and less than or equal to 70.6158;
the curved surface equation of the eighth minor cutting surface (19) is: -9.65xy +12.0639y ^2+11.0021/x +8.51x ^2+19.48=0, wherein x, y and z are coordinate values in a space coordinate system, and x is more than or equal to 4.6171 and less than or equal to 33.9575, and y is more than or equal to 13.358 and less than or equal to 55.66822;
the curved surface equation of the seventh minor cutting surface (18): 4.5915x ^2+2.56xy/21.56+6.456y ^2= z, wherein x, y and z are coordinate values in a space coordinate system, x is more than or equal to 1.8925 and less than or equal to 30.7351, and y is more than or equal to 10.6532 and less than or equal to 29.9876;
the curved surface equation of the sixth secondary cutting surface (17) is as follows: (pi/2) × 2.2149x- (3.3214 x/pi) y + 10.19y2-21.7521xy = z, wherein x, y and z are coordinate values in a space coordinate system, and x is more than or equal to 1.7314 and less than or equal to 32.1941, and y is more than or equal to 20.65 and less than or equal to 19.2815;
establishing an xy rectangular coordinate system by taking the tangent intersection point of the arc lines ha and bc as the circle center;
the main cutting edge (8) is a special-shaped bionic NURBS curve, and the mathematical expression of the curve is as follows: y =4 × 10 -5 x 4 -0.0176x 3 +2.7954x 2 19.61x +51.2191, wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 5.8468 and is less than or equal to 14.3118;
the secondary cutting edge (7) is a special-shaped bionic NURBS curve, and the mathematical expression of the curve is as follows: y =3 × 10 -7 x 4 -8E-05x 3 +0.004x 2 +0.2886x-18.005, wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 0.1853 and is less than or equal to 18.2948;
the profile curve of the longitudinal section of the cutting surface is a special-shaped bionic NURBS curve ef, and the mathematical expression of the curve is as follows: y =1 × 10 -4 x 4 -0.001x 3 +0.65x 2 13.227x +10.0125, wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 2.9207 and less than or equal to 35.6012;
the knife edge (1) is a special-shaped bionic NURBS curve which consists of three segments of ah, hg and gf, and the mathematical expression of the curve of the ah segment is as follows: y = -0.0002x 4 +0.1977x 3 -0.4708x 2 +1.6108x-0.0216, where x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 1.6737 and less than or equal to 21.7027, the mathematical expression of the hg-segment curve is: y =3 × 10-6x 4 -0.0043x 3 +2.2603x 2 -53.0198x +4.6689, wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 2.8218 and less than or equal to 24.3613, and the mathematical expression of a gf-segment curve is as follows: y = -3 × 10 -6 x 4 +0.0049x 3 -2.7596x 2 +6.9264x-6.4911, wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 3.3248 and less than or equal to 24.6857;
the lower edge (4) is a special-shaped bionic NURBS curve which consists of a cd curve and a de curve, and the mathematical expression of the cd curve is as follows: y =0.0268x 4 +0.0185x 3 -8.7135x2+ -18.0752x-13.9268, wherein x and y are coordinate values in a rectangular coordinate system, and the mathematical expression of the de curve is-2.4063 ≦ x ≦ 31.7326, as follows: y =2 × 10-5x 4 -0.0344x 3 +18.447x 2 43.9614x +3.9239, wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 0.3653 and less than or equal to 28.4224;
the longitudinal section curve of the knife back (2) is a straight line, and the mathematical expression is as follows: y =0.0723x-1.8701, wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to 2.6171 and less than or equal to 13.5149; the longitudinal section profile curve of the cutter tail (3) is a special-shaped bionic NURBS curve, and the mathematical expression is as follows: y = -8E-07x 4 +0.001x 3 -0.4352x 2 +86.348x-62.2419; wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to-1.8925 and less than or equal to 32.2956;
the longitudinal section profile of the tool bit (5) is a straight line, and the mathematical expression is as follows: y =3.1752x +6.3772; wherein x and y are coordinate values in a rectangular coordinate system, and x is more than or equal to-3.2026 and less than or equal to 38.6642.
2. The bionic special-shaped cutting tool for silage grass as claimed in claim 1, characterized in that:
a counter bore (11) is arranged on the mounting surface (10), the whole cutter is arranged between a cutter pad (22) of an external base and a cutter seat (21) in a wedge block mode through the counter bore (11) by using a bolt (23), the cutter pad (22) is provided with the counter bore, the cutter seat (21) is provided with a threaded bottom hole, and the cutter seat (21) is fixedly connected on a matched external roller; the mounting angle of the bionic special-shaped silage grass chopping cutter is adjusted by adapting the cutter pad (22) and the cutter holder (21) in different hole opening directions.
3. The bionic special-shaped cutting tool for silage grass according to claim 1, characterized in that: the thickness of the tool bit (5) is 6mm.
CN202210378743.7A 2022-04-12 2022-04-12 Bionic special-shaped cutter for silage forage grass Active CN114698474B (en)

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AU4359485A (en) * 1984-05-25 1985-12-31 George Samuel Copping Improvements in or relating to mowing machines
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