Bionic grass cutting sickle

Abstract

The present application relates to a kind of bionic forage cutting bending knife, belong to agricultural machinery technical field.The present application includes blade back, tool bit;Blade back includes blade left side, blade right side, blade upper side, top mounting surface and bottom mounting surface;Tool bit includes outer side secondary contact surface, outer side contact surface, cutting edge, main cutting plane, inner side contact surface;Tool bit is obtained from the curve of beaver lower canine in nature;Inner side contact surface is between main cutting plane and bottom mounting surface, outer side secondary contact surface is between outer side contact surface and top mounting surface, and cutting edge is between main cutting plane and outer side contact surface.The present application is compared to ordinary forage cutting bending knife, self-sharpening effect is obvious, and segment length uniformity is high, and power consumption is low.

Description

Technical Field

[0001] The invention relates to a bionic forage chopping scimitar, belonging to the technical field of agricultural machinery. Background Art

[0002] In livestock production, forage chopping is a critical step in ensuring feed quality and animal digestion efficiency. While conventional forage chopping devices have met the needs of the livestock industry to a certain extent, they still have numerous shortcomings. These include uneven cut lengths, which reduce animal digestibility; high energy consumption, which increases feeding costs; and rapid blade wear, which shortens the equipment's lifespan. Therefore, designing a new forage chopping device that overcomes these shortcomings has become a pressing issue in livestock technology.

[0003] Based on the above background, the present invention proposes a bionic forage chopping scimitar. The scimitar draws on the excellent cutting mechanism of beavers in nature, and aims to achieve efficient and uniform chopping of forage by optimizing the shape of the blade. Compared with traditional chopping devices, the present invention has the advantages of uniform cutting length, low energy consumption, long scimitar life, and anti-blocking, which can significantly improve the chopping effect of forage and the economic benefits of animal husbandry. Based on the technical problems of patent (CN202210378743.7), such as easy blockage, short scimitar life, serious phenomenon of forage sticking to the tool, low practicality, and difficulty in processing and manufacturing, the present invention adopts cycloid, coating, waist-shaped hole and other technical means to improve. Summary of the Invention

[0004] The technical problem to be solved by the present invention is: the present invention provides a bionic forage chopping scimitar, which has a compact structure, is easy to operate, economical and practical, and provides a brand-new solution for forage chopping operations. During the forage chopping process, the scimitar exhibits excellent chopping performance, excellent anti-blocking effect, long service life, uniform cutting segments, and significantly improved efficiency. By reducing the cutting resistance, the scimitar effectively reduces power consumption, thereby achieving energy savings. At the same time, the installation and disassembly process of the present invention is simple and quick, maintenance is convenient, and the gap between the movable and fixed blades has a large adjustment range, which effectively solves the problems of easy wear of the scimitar during chopping, uneven cutting length, insufficient reliability, and excessive energy consumption.

[0005] The technical solution of the present invention is: a bionic forage chopping scimitar, comprising a blade back 2 and a blade head 4;

[0006] The blade back 2 includes a blade left side 1, a blade right side 3, a blade upper side 16, a top mounting surface 10 and a bottom mounting surface 12;

[0007] The cutter head 4 includes an outer secondary contact surface 9, an outer contact surface 8, a cutting edge 7, a main cutting plane 6, and an inner contact surface 5; the cutter head 4 is inspired by the curve of the lower incisor of a beaver in nature; the inner contact surface 5 is located between the main cutting plane 6 and the bottom mounting surface 12, the outer secondary contact surface 9 is located between the outer contact surface 8 and the top mounting surface 10, and the cutting edge 7 is located between the main cutting plane 6 and the outer contact surface 8.

[0008] As a further solution of the present invention, the left side 1 of the blade and the back 2 of the blade form an inverted L-shaped blade; the right side 3 of the blade and the back 2 of the blade form an inverted L-shaped blade.

[0009] As a further embodiment of the present invention, the cutting edge 7 is a boundary curve between the main cutting plane 6 and the outer contact surface 8, and is a special-shaped bionic NURBS curve; the left and right end surfaces of the top mounting surface 10 are the left side surface 1 of the cutting edge and the right side surface 3 of the cutting edge, respectively; the outer secondary contact surface 9 is a transition surface between the top mounting surface 10 and the outer contact surface 8; the front end side of the top mounting surface 10 is the cutter head 4; the upper end surface of the main cutting plane 6 is the inner contact surface 5, and the lower end of the main cutting plane 6 is the cutting edge 7;

[0010] The upper end of the top mounting surface 10 is designed to be a blade upper side surface 16 , and bolt reserved holes 11 are preset on the top mounting surface 10 and the bottom mounting surface 12 .

[0011] As a further solution of the present invention, the upper side surface 16 of the blade is concave in the middle, and the shape of the upper side surface 16 of the blade is trapezoidal.

[0012] As a further solution of the present invention, a spatial rectangular coordinate system o-xyz is established with the left end point N of the cutting edge 7 as the center of the circle, points A to N are the end points of the cutting surface curves, and O is the midpoint of the cutting edge 7;

[0013] Points ABMN are the four endpoints of the main cutting plane 6, counting counterclockwise from right to left;

[0014] Points BCLM are the four endpoints of the inner contact surface 5 counted counterclockwise from right to left;

[0015] Points CFIL are the four endpoints of the bottom mounting surface 12 counted counterclockwise from right to left;

[0016] Points EGHJ are the four endpoints of the top mounting surface 10 counted counterclockwise from right to left;

[0017] Points DEJK are the four endpoints of the outer secondary contact surface 9 counted counterclockwise from right to left;

[0018] Points ADKN are the four endpoints of the outer contact surface 8 counted counterclockwise from right to left;

[0019] The cutting edge 7 is a curve with AN as the endpoint, and this curve is a special-shaped bionic NURBS curve.

[0020] As a further solution of the present invention, in the projection on the XY plane on the left side of the spatial rectangular coordinate system o-xyz, the side curve ML on the inner contact surface 5 is a bionic curve, and its mathematical expression is: y1 = 0.0417x1 4 -1.8032x1 3 +28.983x1 2 -204.64x1+536.46, the rate of change in the plane is: y1′=0.1668x1 3 -5.4096x1 2 +57.966x1-204.64; x1 and y1 are coordinate values ​​in the spatial coordinate system, and 9.4473073≤x1≤13.034872, 1.330945≤y1≤2.45029;

[0021] The side curve NK on the outer contact surface 8 is a bionic curve, and its mathematical expression is:

[0022] y2=0.0015x2 4 -0.0281x2 3 +0.1456x2 2 +0.722x2-0.1471, the rate of change in the plane is:

[0023] y2′=0.006x2 3 -0.0843x2 2 +0.2912x²+0.722; where x² and y² are coordinate values ​​in the spatial coordinate system, and 0.263971≤x²≤10.163907, 0.05397≤y²≤8.62905;

[0024] The side curve JK on the outer secondary contact surface 9 is a bionic curve, and its mathematical expression is:

[0025] y3=0.0065x3 3 +0.3078x3 2 -8.6888x3+58.515, the rate of change in the plane is:

[0026] y3′=0.0195x3 2 +0.6156x3-8.6888, where x3 and y3 are coordinate values ​​in the spatial coordinate system, 10.163907≤x3≤11.834902, 8.62905≤y3≤9.562749;

[0027] In the projection on the right XY plane, the curve AD on the outer contact surface 8 is a special-shaped bionic curve, and its mathematical expression is: y4=0.0002x4 4 -0.0038x4 3 +0.0164x4 2 +0.8857x4-0.5819, the rate of change in the plane is: y4′=0.0008x4 3 -0.0114x4 2 +0.0328x4+0.8857; where x4 and y4 are coordinate values ​​in the spatial coordinate system, and 0.632859≤x4≤10.785397, 0.06283≤y4≤8.562805;

[0028] The curve BC on the inner contact surface 5 is a special-shaped bionic curve, and its mathematical expression is:

[0029] =-0.0607x5 4 +2.8027x5 3 -48.519x5 2 +373.67x5-1079.9, the rate of change in the plane is:

[0030] y5′=-0.2428x5 3 +8.4081x5 2 -97.038x5+373.67, where x5 and y5 are coordinate values ​​in the spatial coordinate system, and 10.156075≤x5≤13.148462, 1.245892≤y5≤2.114386;

[0031] The side curve DE on the outer secondary contact surface 9 is a special-shaped bionic curve, and its mathematical expression is: y6 = -0.0024x6 4 +0.097x6 3 -1.5666x6 2 +12.484x6-33.569, the rate of change in the plane is: y6′

[0032] =-0.0096x6 3 +0.291x6 2 -3.1332x6+12.484; x6 and y6 are coordinate values ​​in the spatial coordinate system, and 10.785397≤x6≤13.072745, 8.562805≤y6≤9.594805.

[0033] As a further solution of the present invention, in the projection on the XY plane on the left side of the spatial rectangular coordinate system o-xyz, the above mounting surface is the projection surface, that is, the projection on the XZ plane of the upper projection surface;

[0034] The curve AN of the cutting edge 7 is a special bionic curve, and its mathematical expression is: x7=-6E-10 -10 z7 4 +6E-07z7 3 -9E-05z7 2 -0.0058z7-0.5051, the variation rate in the plane is:

[0035] x7'= -24E-10 -10 z7 3 +18E-07z7 2 -18E-05z7-0.0058; wherein x7 and z7 are coordinate values in a spatial coordinate system, and -1.769472≤x7≤-0.513758, 0.8327589≤z7≤285.46782;

[0036] The curve KD on the outer side secondary contact surface 9 has a mathematical expression: x8=2E-05z8 2 -0.0059z8+9.4923, the variation rate in the plane is: x8'=4E-05z8-0.0059; wherein x8 and z8 are coordinate values in a spatial coordinate system, and 9.072486≤x8≤9.482496, 2.093958≤z8≤283.783944;

[0037] The curve JE on the outer side secondary contact surface 9 has a mathematical expression:

[0038] x9=7E-05z 2 -0.0256z+12.47, the variation rate in the plane is: x9'=14E-05z-0.0256; wherein x9 and z9 are coordinate values in a spatial coordinate system, and 10.324855≤x9≤12.43648, 2.923047≤z9≤280.3748.

[0039] As a further scheme of the application, in the projection on the left XY plane of the spatial rectangular coordinate system o-xyz, the lower mounting surface is the projection plane, i.e. the projection on the lower projection plane XZ plane;

[0040] The curve BM on the inner side contact surface 5 has a mathematical expression: x 11 =-6E-09z 11 4 +3E-06z 11 3 -0.0004z 11 2 +0.0019z 11+4.1614, the rate of change in the plane is: x 11 ′=-24E-09z 11 3 +9E-06z 11 2 -0.0008z 11 +0.0019; where x 11 、z 11 are coordinate values ​​in the spatial coordinate system, and

[0041] 3.113758≤x 11 ≤4.532859,1.723846≤z 11 ≤285.223748;

[0042] The mathematical expression of the curve CL on the inner contact surface 5 is: 12 =-3E-11z 12 5 +2E-08z 12 4 -5E-06z 12 3 +0.0006z 12 2 -0.0407z 12 +9.6805, the rate of change in the plane is: x 12 ′=-15E-11z 12 4 +8E-08z 12 3 -15E-06z 12 2 +0.0012z 12 -0.0407; where x 12 、z 12 All are coordinate values ​​in the spatial coordinate system, and 7.523847≤x 12 ≤9.943748,1.489035≤z 12 ≤284.042846.

[0043] The mathematical expression of the curve BM on the inner contact surface 5 is: 13 =-6E-09z 13 4 +3E-06z 13 3 -0.0004z 13 2 +0.0019z 13 +4.1614, the rate of change in the plane is: x 13 ′=-24E-09z 133 +9E-06z 13 2 -0.0008z 13 +0.0019; where x 13 、z 13 All are coordinate values ​​in the spatial coordinate system, and 3.113758≤x 13 ≤4.532859,1.723846≤z 13 ≤285.223748;

[0044] The mathematical expression of the curve CL on the inner contact surface 5 is: 14 =-3E-11z 14 5 +2E-08z 14 4 -5E-06z 14 3 +0.0006z 14 2 -0.0407z 14 +9.6805, the rate of change in the plane is: x 14 ′=-15E-11z 14 4 +8E-08z 14 3 -15E-06z 14 2 +0.0012z 14 -0.0407; where x 14 、z 14 All are coordinate values ​​in the spatial coordinate system, and 7.523847≤x 14 ≤9.943748,1.489035≤z 14 ≤284.042846.

[0045] As a further embodiment of the present invention, the curve AB on the inner contact surface 5 is a cycloid. The cycloid AB is the set of points along the trajectory of a base circle with a diameter of d as it rolls along a tangent to the base circle. The tangent to the base circle is fixed, and the angle between the tangent to the base circle and a line parallel to the X-axis is 17°. This design ensures that the chopped forage leaves the cutting surface as quickly as possible when the scimitar cuts forage, preventing straw from backflowing and clogging the feed inlet.

[0046] As a further solution of the present invention, the tips on both sides of the cutting blade 7 are not of the same height, and the tip on the left side is 0.5-0.83 mm higher than the tip on the right side; the tips on both sides are located at the lower point of the cutting blade, and the tips on both sides do not directly bear the impact, which is beneficial to protecting the tips and improving the stress condition of the scimitar, thereby extending the service life of the scimitar.

[0047] The bending knife material is 65Mn, and the bending knife surface has an AlTiCN coating layer with a thickness of 2-20 microns; the nanohardness of the AlTiCN coating layer is greater than or equal to 20 GPa; the bending knife friction and wear are reduced, the service life of the bending knife is improved, and the frequency of the phenomenon that the forage is bonded to the cutter is also effectively reduced.

[0048] The bolt reserved hole 11 is a waist-shaped hole with a hole length of 43 mm, which is convenient for adjusting the gap between the moving knife and the fixed knife and the installation angle of the bending knife to meet the cutting length of different crops.

[0049] The blade inclination angle of the bending knife is 1-2°, and the blade opening angle of the bending knife is 28-33°, the curve is smooth, the connection is gentle, and the practicability is strong, and batch manufacturing can be carried out.

[0050] The beneficial effects of the present application are:

[0051] (1) The bending knife curve of the bionic forage cutting bending knife is bionic beaver tooth profile, compared with ordinary forage cutting bending knife, the self-sharpening effect is obvious, the cutting length uniformity is high, and the power consumption is low.

[0052] (2) The bionic forage cutting bending knife, compared with the prior art, the curve on one side of the inner contact surface is a cycloid, so that the cut forage leaves the cutting surface at the fastest speed, prevents the forage from flowing backward and blocking the feed inlet.

[0053] (3) The bionic forage cutting bending knife is coated with an AlTiCN coating layer with a thickness of 2-20 microns, which reduces the friction and heat between the bending knife and the forage during cutting, thereby reducing the frequency of the phenomenon of cutter bonding during forage cutting, protecting the bending knife from corrosion by forage, thereby prolonging the service life of the bending knife,

[0054] (4) The bionic forage cutting bending knife, compared with the ordinary forage cutting bending knife, the gap between the moving knife and the fixed knife is fixed and cannot be adjusted, the hole length of the waist-shaped hole is 43 mm, which is convenient for adjusting the gap between the moving knife and the fixed knife and the installation angle of the bending knife to meet the cutting length of different crops, and the application range is wide.

[0055] (5) The bionic forage cutting bending knife has a blade opening angle of 28-33°, compared with the prior art, the bending knife curve is smooth and the connection is gentle, easy to process, strong practicability, low cost, and can be mass-produced. BRIEF DESCRIPTION OF DRAWINGS

[0056] Figure 1 is a front view of the bionic forage cutting bending knife of the present application;

[0057] Figure 2 is a rear end view of the bionic forage cutting bending knife of the present application;

[0058] Figure 3 Schematic diagram of the bionic forage chopping scimitar of the present invention with coordinate axes and curve characteristic points marked;

[0059] Figure 4 This is a schematic diagram of the left side projection of the bionic forage chopping scimitar of the present invention;

[0060] Figure 5 2. It is a schematic diagram of the right side projection of the bionic forage chopping scimitar of the present invention;

[0061] Figure 6 Schematic diagram of the projection of the bionic forage chopping scimitar of the present invention on the upper mounting surface;

[0062] Figure 7 Schematic diagram of the projection of the bionic forage chopping scimitar of the present invention on the lower mounting surface;

[0063] Figure 8 Schematic diagram of the inclination angle of the bionic forage chopping curved blade of the present invention;

[0064] Figure 9 This is a schematic diagram of a simplified process of chopping grass using a bionic scimitar chopping blade according to the present invention;

[0065] Figure 10 This is a schematic diagram of the AB trajectory of one side of the bionic forage chopping scimitar of the present invention;

[0066] Figure 11 It is a schematic diagram of the installation of the present invention.

[0067] Figure 1-11 The numbers in the figure are: 1-left side of the blade, 2-back of the blade, 3-right side of the blade, 4-cutting head, 5-inner contact surface, 6-main cutting plane, 7-cutting edge, 8-outer contact surface, 9-outer secondary contact surface, 10-top mounting surface, 11-bolt reserved hole, 12-bottom mounting surface, 13-bolt, 14-shim, 15-tool seat, 16-upper side of the blade. DETAILED DESCRIPTION

[0068] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0069] Example 1: Figures 1-11 As shown, a bionic forage chopping scimitar comprises a blade back 2 and a blade head 4;

[0070] Figure 1 and Figure 2 They are schematic diagrams of the front and rear ends of the bionic forage chopping scimitar of the present invention;

[0071] Figure 1In the embodiment, the blade back 2 comprises a left blade side 1, a right blade side 3, an upper blade side 16, a top mounting surface 10 and a bottom mounting surface 12.

[0072] Figure 1 and Figure 2 In the embodiment, the tool bit 4 comprises an outer minor contact surface 9, an outer contact surface 8, a cutting blade 7, a main cutting plane 6, an inner contact surface 5; the tool bit 4 is bionically derived from the curve of the lower door tooth of a beaver in nature; the inner contact surface 5 is located between the main cutting plane 6 and the bottom mounting surface 12, the outer minor contact surface 9 is located between the outer contact surface 8 and the top mounting surface 10, and the cutting blade 7 is between the main cutting plane 6 and the outer contact surface 8.

[0073] Figure 1 In the embodiment, as a further scheme of the present application, the left blade side 1 and the blade back 2 form an inverted L-shaped knife; the right blade side 3 and the blade back 2 form an inverted L-shaped knife.

[0074] As a further scheme of the present application, the cutting blade 7 is a boundary curve of the main cutting plane 6 and the outer contact surface 8, which is a special bionic NURBS curve; the left and right sides of the top mounting surface 10 are respectively the left blade side 1 and the right blade side 3; the outer minor contact surface 9 is a transition surface between the top mounting surface 10 and the outer contact surface 8; the front side of the top mounting surface 10 is the tool bit 4; the upper end of the main cutting plane 6 is the inner contact surface 5, and the lower end of the main cutting plane 6 is the cutting blade 7.

[0075] The upper end of the top mounting surface 10 is designed as the upper blade side 16, and bolt reserved holes 11 are pre-set on the top mounting surface 10 and the bottom mounting surface 12. The installation of the whole bending knife is achieved by these bolt reserved holes 11, and the bending knife is firmly fixed between the knife pad 14 and the knife seat 15 by bolts 13. The knife pad 14 is internally provided with a counterbore, and the knife seat 15 is provided with a threaded bottom hole, which ensures the stability of the installation. The knife seat 15 is firmly connected to a matched external roller. In order to flexibly adjust the installation angle of the silage bionic special-shaped chopping bending knife, knife pads 14 and knife seats 15 with different hole directions are adapted for use.

[0076] As a further scheme of the present application, the upper blade side 16 is concave in the middle, and the shape of the upper blade side 16 is trapezoidal.

[0077] As a further scheme of the present application, Figure 3 In the embodiment, a spatial rectangular coordinate system o-xyz is established with the left end point N of the cutting blade 7 as the center, and points A-N are the end points of the cutting surface curves, and O is the midpoint of the cutting blade 7.

[0078] Points ABMN are the four end points of the main cutting plane 6 in counterclockwise order from right to left.

[0079] Point BCLM is one of the four end points of the inner contact surface 5 counted counterclockwise from right to left;

[0080] Point CFIL is one of the four end points of the bottom mounting surface 12 counted counterclockwise from right to left;

[0081] Point EGHJ is one of the four end points of the top mounting surface 10 counted counterclockwise from right to left;

[0082] Point DEJK is one of the four end points of the outer secondary contact surface 9 counted counterclockwise from right to left;

[0083] Point ADKN is one of the four end points of the outer contact surface 8 counted counterclockwise from right to left;

[0084] The cutting edge 7 is a curve with AN as the end point, which is a special-shaped bionic NURBS curve.

[0085] As a further scheme of the present application, Figure 4 In the projection on the XY plane on the left side of the spatial rectangular coordinate system o-xyz, the one-side curve ML on the inner contact surface 5 is a bionic curve, and its mathematical expression is: y1=0.0417x1 4 -1.8032x1 3 +28.983x1 2 -204.64x1+536.46, and the variation rate in the plane is: y1'=0.1668x1 3 -5.4096x1 2 +57.966x1-204.64; wherein x1, y1 are coordinate values in the spatial coordinate system, and 9.4473073≤x1≤13.034872, 1.330945≤y1≤2.45029;

[0086] The one-side curve NK on the outer contact surface 8 is a bionic curve, and its mathematical expression is:

[0087] y2=0.0015x2 4 -0.0281x2 3 +0.1456x2 2 +0.722x2-0.1471, and the variation rate in the plane is:

[0088] y2'=0.006x2 3 -0.0843x2 2 +0.2912x2+0.722; wherein x2, y2 are coordinate values in the spatial coordinate system, and 0.263971≤x2≤10.163907, 0.05397≤y2≤8.62905;

[0089] The curve JK on one side of the outer side secondary contact surface 9 is a bionic curve, and its mathematical expression is:

[0090] y3 = 0.0065x3 3 + 0.3078x3 2 - 8.6888x3 + 58.515, the variation rate in the plane is:

[0091] y3' = 0.0195x3 2 + 0.6156x3 - 8.6888, wherein x3, y3 are coordinate values in the spatial coordinate system, 10.163907≤x3≤11.834902, 8.62905≤y3≤9.562749;

[0092] Figure 5 In the projection on the right XY plane, the curve AD on the outer side contact surface 8 is a special bionic curve, and its mathematical expression is: y4 = 0.0002x4 4

[0093] - 0.0038x4 3 + 0.0164x4 2 + 0.8857x4 - 0.5819, the variation rate in the plane is: y4' = 0.0008

[0094] x4 3 - 0.0114x4 2 + 0.0328x4 + 0.8857; wherein x4, y4 are coordinate values in the spatial coordinate system, and 0.632859≤x4≤10.785397, 0.06283≤y4≤8.562805;

[0095] The curve BC on the inner side contact surface 5 is a special bionic curve, and its mathematical expression is: y5

[0096] = -0.0607x5 4 + 2.8027x5 3 - 48.519x5 2 + 373.67x5 - 1079.9, the variation rate in the plane is:

[0097] y5' = -0.2428x5 3 + 8.4081x5 2 - 97.038x5 + 373.67, wherein x5, y5 are coordinate values in the spatial coordinate system, and 10.156075≤x5≤13.148462, 1.245892≤y5≤2.114386;

[0098] The curve DE on the outer side secondary contact surface 9 is a special bionic curve, and its mathematical expression is: y6=-0.0024x6 4 +0.097x6 3 -1.5666x6 2 +12.484x6-33.569, and the variation rate in the plane is: y6′

[0099] =-0.0096x6 3 +0.291x6 2 -3.1332x6+12.484; wherein x6, y6 are coordinate values in a space coordinate system, and 10.785397≤x6≤13.072745, 8.562805≤y6≤9.594805.

[0100] Figure 6 In the projection on the left XY plane of the space rectangular coordinate system o-xyz, the above mounting surface is the projection plane, namely the projection of the upper projection plane XZ;

[0101] The curve AN of the cutting edge 7 is a special bionic curve, and its mathematical expression is: x7=-6E-10 -10 z7 4 +6E-07z7 3 -9E-05z7 2 -0.0058z7-0.5051, and the variation rate in the plane is:

[0102] x7′=-24E-10 -10 z7 3 +18E-07z7 2 -18E-05z7-0.0058; wherein x7, z7 are coordinate values in a space coordinate system, and -1.769472≤x7≤-0.513758, 0.8327589≤z7≤285.46782;

[0103] The curve KD on the outer side secondary contact surface 9 has a mathematical expression: x8=2E-05z8 2 -0.0059z8+9.4923, and the variation rate in the plane is: x8′=4E-05z8-0.0059; wherein x8, z8 are coordinate values in a space coordinate system, and 9.072486≤x8≤9.482496, 2.093958≤z8≤283.783944;

[0104] The curve JE on the outer side secondary contact surface 9 has a mathematical expression:

[0105] x9=7E-05z 2-0.0256z+12.47, the rate of change in the plane is: x9′=14E-05z-0.0256; where x9 and z9 are coordinate values ​​in the spatial coordinate system, and 10.324855≤x9≤12.43648, 2.923047≤z9≤280.3748.

[0106] Figure 7 In the projection on the XY plane on the left side of the spatial rectangular coordinate system o-xyz, as a further embodiment of the present invention, the lower mounting surface is the projection surface, that is, the projection on the XZ plane of the lower projection surface;

[0107] Figure 6 In the figure, the curve BM on the inner contact surface 5 is expressed as follows:

[0108] x 11 =-6E-09z 11 4 +3E-06z 11 3 -0.0004z 11 2 +0.0019z 11 +4.1614, the rate of change in the plane is:

[0109] x 11 ′=-24E-09z 11 3 +9E-06z 11 2 -0.0008z 11 +0.0019; where x 11 、z 11 All are coordinate values ​​in the spatial coordinate system, and 3.113758≤x 11 ≤4.532859,1.723846≤z 11 ≤285.223748;

[0110] The mathematical expression of the curve CL on the inner contact surface 5 is: 12 =-3E-11z 12 5 +2E-08z 12 4 -5E-06z 12 3 +0.0006z 12 2 -0.0407z 12 +9.6805, the rate of change in the plane is: x 12 ′=-15E-11z 12 4 +8E-08z12 3 -15E-06z 12 2 +0.0012z 12 -0.0407; where x 12 、z 12 All are coordinate values ​​in the spatial coordinate system, and 7.523847≤x 12 ≤9.943748,1.489035≤z 12 ≤284.042846;

[0111] The mathematical expression of the curve BM on the inner contact surface 5 is: 13 =-6E-09z 13 4 +3E-06z 13 3 -0.0004z 13 2 +0.0019z 13 +4.1614, the rate of change in the plane is: x 13 ′=-24E-09z 13 3 +9E-06z 13 2 -0.0008z 13 +0.0019; where x 13 、z 13 All are coordinate values ​​in the spatial coordinate system, and 3.113758≤x 13 ≤4.532859,1.723846≤z 13 ≤285.223748;

[0112] The mathematical expression of the curve CL on the inner contact surface 5 is: 14 =-3E-11z 14 5 +2E-08z 14 4 -5E-06z 14 3 +0.0006z 14 2 -0.0407z 14 +9.6805, the rate of change in the plane is: x 14 ′=-15E-11z 14 4 +8E-08z 14 3 -15E-06z 14 2 +0.0012z 14-0.0407; where x 14 、z 14 All are coordinate values ​​in the spatial coordinate system, and 7.523847≤x 14 ≤9.943748,1.489035≤z 14 ≤284.042846.

[0113] Figure 8 In the embodiment, the cutting tips on both sides of the cutting blade 7 are not of equal height, and the left cutting tip is 0.5-0.83 mm higher than the right cutting tip;

[0114] The scimitar is made of 65Mn and has an AlTiCN coating on its surface. The AlTiCN coating has a thickness of 2-20 μm and a nanohardness of 20 GPa or higher. The AlTiCN coating effectively prevents the scimitar from corroding when chopping green fodder, significantly improves the wear resistance of the scimitar, and reduces the frequency of tool sticking during forage cutting.

[0115] The bolt reserved hole 11 is a waist-shaped hole with a hole length of 43 mm, which is convenient for adjusting the gap between the movable and fixed blades and the installation angle of the curved blade to meet the cutting length of different crops and has a wide range of applications.

[0116] Figure 8 In the cutting process, the blade inclination angle of the scimitar is 1-2°, so that the blade tips on both sides are located at the lowest point of the cutting edge. The blade tips on both sides do not directly bear the impact, which is beneficial to protecting the blade tips and improving the stress condition of the scimitar.

[0117] The opening angle of the machete blade is 28-33°, and the herringbone-shaped arrangement of the chopping drum achieves the best sliding cutting effect, reduces power consumption and improves feed cutting efficiency.

[0118] like Figure 9 As shown in the figure, the simplified chopping process is shown in the figure. After the fed forage stems are chopped by the chopping machete, the chopped forage stems are transported out as the machete rotates.

[0119] like Figure 10 As shown, the curve AB on the inner contact surface 5 is a cycloid. The cycloid AB is the set of points along the trajectory of a base circle with a diameter of d as it rolls along its tangent. The tangent to the base circle is fixed, and the angle between the tangent and a line parallel to the X-axis is 17°. This design ensures that the chopped feed leaves the cutting position as quickly as possible when the blade chops, preventing straw from backflowing and clogging the feed inlet.

[0120] The working principle of the present invention is as follows:

[0121] The application is a kind of bionic special-shaped chopping bending knife based on the structure design of beaver lower door teeth shape, in the structure, the main cutting plane adopts special-shaped bionic design, and is equipped with cutting edge, to realize efficient chopping function. The inner contact surface is a transition curved surface, connecting the main cutting plane and the bottom mounting surface, making the overall structure more smooth, wherein the curve AB ensures that the straw material quickly leaves the cutting position, preventing the feeding port from being blocked. The top mounting surface is connected with two side surfaces, and bolt reserved holes are arranged on the top mounting surface, to facilitate adjusting the gap between the moving knife and the fixed knife and the installation inclination angle of the bending knife. When the whole plant forage material enters the chopping process, it forms contact with the cutting surface of the bending knife, and the material is immediately broken under the action of sliding cutting or shearing. This design effectively reduces the cutting resistance and energy consumption, so that the forage straw can complete the cutting section at one time, thereby significantly improving the working efficiency of the silage forage harvester.

[0122] The specific embodiments of the application are described in detail above in combination with the drawings, but the application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the purpose of the application.

Claims

1. A bionic forage chopping knife, characterized by: It includes a blade back (2) and a blade head (4); The blade back (2) comprises a blade left side (1), a blade right side (3), a blade upper side (16), a top mounting surface (10) and a bottom mounting surface (12); The cutter head (4) comprises an outer secondary contact surface (9), an outer contact surface (8), a cutting edge (7), a main cutting plane (6), and an inner contact surface (5); the cutter head (4) is biomimetic from the curve of the lower incisor of a beaver in nature; the inner contact surface (5) is located between the main cutting plane (6) and the bottom mounting surface (12), the outer secondary contact surface (9) is located between the outer contact surface (8) and the top mounting surface (10), and the cutting edge (7) is located between the main cutting plane (6) and the outer contact surface (8); The left end point N of the cutting edge (7) is set as the center of the circle, and a spatial rectangular coordinate system o-xyz is established, where points A to N are the end points of each cutting surface curve, and O is the midpoint of the cutting edge (7); Points ABMN are the four endpoints of the main cutting plane (6) counting counterclockwise from right to left; Points BCLM are the four endpoints of the inner contact surface (5) counting counterclockwise from right to left; Points CFIL are the four endpoints of the bottom mounting surface (12) counted counterclockwise from right to left; Points EGHJ are the four endpoints of the top mounting surface (10) counted counterclockwise from right to left; Points DEJK are the four endpoints of the outer secondary contact surface (9) counting counterclockwise from right to left; Points ADKN are the four endpoints of the outer contact surface (8) counting counterclockwise from right to left; The cutting edge (7) is a curve with AN as an endpoint, and this curve is a special-shaped bionic NURBS curve; In the projection on the XY plane on the left side of the spatial rectangular coordinate system o-xyz, the side curve ML on the inner contact surface (5) is a bionic curve, and its mathematical expression is: y1=0.0417x1 4 -1.8032x1 3 +28.983x1 2 -204.64x1+536.46, the rate of change in the plane is: y1 =0.1668x1 3 -5.4096x1 2 +57.966x1-204.64; x1 and y1 are coordinate values ​​in the spatial coordinate system, and 9.4473073≤x1≤13.034872, 1.330945≤y1≤2.45029; The side curve NK on the outer contact surface (8) is a bionic curve, and its mathematical expression is: y2=0.0015x2 4 -0.0281x2 3 +0.1456x2 2 +0.722x2-0.1471, the rate of change in the plane is: y2 =0.006x2 3 -0.0843x2 2 +0.2912x²+0.722; where x² and y² are coordinate values ​​in the spatial coordinate system, and 0.263971≤x²≤10.163907, 0.05397≤y²≤8.62905; The side curve JK on the outer secondary contact surface (9) is a bionic curve, and its mathematical expression is: y3=0.0065x3 3 +0.3078x3 2 -8.6888x3+58.515, the rate of change in the plane is: y3 =0.0195x3 2 +0.6156x3-8.6888, where x3 and y3 are coordinate values ​​in the spatial coordinate system, 10.163907≤x3≤11.834902, 8.62905≤y3≤9.562749; In the projection on the right XY plane, the curve AD on the outer contact surface (8) is a special-shaped bionic curve, and its mathematical expression is: y4 = 0.0002x4 4 -0.0038x4 3 +0.0164x4 2 +0.8857x4-0.5819, the rate of change in the plane is: y4 =0.0008 x4 3 -0.0114x4 2 +0.0328x4+0.8857; where x4 and y4 are coordinate values ​​in the spatial coordinate system, and 0.632859≤x4≤10.785397, 0.06283≤y4≤8.562805; The curve BC on the inner contact surface (5) is a special-shaped bionic curve, and its mathematical expression is: y5 = -0.0607x5 4 +2.8027x5 3 -48.519x5 2 +373.67x5-1079.9, the rate of change in the plane is: y5 =-0.2428x5 3 +8.4081x5 2 -97.038x5+373.67, where x5 and y5 are coordinate values ​​in the spatial coordinate system, and 10.156075≤x5≤13.148462, 1.245892≤y5≤2.114386; The side curve DE on the outer secondary contact surface (9) is a special-shaped bionic curve, and its mathematical expression is: y6 = -0.0024x6 4 +0.097x6 3 -1.5666x6 2 +12.484x6-33.569, the rate of change in the plane is: y6 =-0.0096x6 3 +0.291x6 2 -3.1332x6+12.484; x6 and y6 are coordinate values ​​in the spatial coordinate system, and 10.785397≤x6≤13.072745, 8.562805≤y6≤9.594805; In the projection on the XY plane on the left side of the spatial rectangular coordinate system o-xyz, the above mounting surface is the projection surface, that is, the projection on the XZ plane of the upper projection surface; The curve AN of the cutting edge (7) is a special-shaped bionic curve, and its mathematical expression is: x7=-6E-10 -10 z7 4 +6E-07z7 3 -9E-05z7 2 -0.0058z7-0.5051, the rate of change in the plane is: x7 =-24E-10 -10 z7 3 +18E-07z7 2 -18E-05z7-0.0058; x7 and z7 are coordinate values ​​in the spatial coordinate system, and -1.769472≤x7≤-0.513758, 0.8327589≤z7≤285.46782; The curve KD on the outer secondary contact surface (9) has the mathematical expression: x8=2E-05z8 2 -0.0059 z8+9.4923, the rate of change in the plane is: x8 =4E-05z8-0.0059; where x8 and z8 are coordinate values ​​in the spatial coordinate system, and 9.072486≤x8≤9.482496, 2.093958≤z8≤283.783944; The curve JE on the outer secondary contact surface (9) has the mathematical expression: x9=7E-05z 2 -0.0256z+12.47, the rate of change in the plane is: x9 =14E-05z-0.0256; where x9 and z9 are coordinate values ​​in the spatial coordinate system, and 10.324855≤x9≤12.43648, 2.923047≤z9≤280.3748; In the projection on the XY plane on the left side of the spatial rectangular coordinate system o-xyz, the lower mounting surface is the projection surface, that is, the projection on the XZ plane of the lower projection surface; The curve BM on the inner contact surface (5) has the mathematical expression: 11 =-6E-09z 11 4 +3E-06 z 11 3 -0.0004z 11 2 +0.0019 z 11 +4.1614, the rate of change in the plane is: x 11 =-24E-09z 11 3 +9E-06 z 11 2 -0.0008z 11 +0.0019; where x 11 、z 11 All are coordinate values ​​in the spatial coordinate system, and 3.113758≤x 11 ≤4.532859,1.723846≤z 11 ≤285.223748; The curve CL on the inner contact surface (5) has the following mathematical expression: 12 =-3E-11z 12 5 +2E-08 z 12 4 -5E-06z 12 3 +0.0006z 12 2 -0.0407z 12 +9.6805, the rate of change in the plane is: x 12 =-15E-11 z 12 4 +8E-08z 12 3 -15E-06z 12 2 +0.0012z 12 -0.0407; where x 12 、z 12 All are coordinate values ​​in the spatial coordinate system, and 7.523847≤x 12 ≤9.943748,1.489035≤z 12 ≤284.042846; The curve BM on the inner contact surface (5) has the mathematical expression: 13 =-6E-09z 13 4 +3E-06z 13 3 -0.0004z 13 2 +0.0019z 13 +4.1614, the rate of change in the plane is: x 13 =-24E-09z 13 3 +9E-06z 13 2 -0.0008z 13 +0.0019; where x 13 、z 13 All are coordinate values ​​in the spatial coordinate system, and 3.113758≤x 13 ≤4.532859,1.723846≤z 13 ≤285.223748; The curve CL on the inner contact surface (5) has the mathematical expression: 14 =-3E-11z 14 5 +2E-08z 14 4 -5E-06z 14 3 +0.0006z 14 2 -0.0407z 14 +9.6805, the rate of change in the plane is: x 14 =-15E-11z 14 4 +8 E-08z 14 3 -15E-06z 14 2 +0.0012z 14 -0.0407; where x 14 、z 14 All are coordinate values ​​in the spatial coordinate system, and 7.523847≤x 14 ≤9.943748,1.489035≤z 14 ≤284.042846.

2. The bionic forage chopping knife according to claim 1, characterized in that: The left side of the blade (1) and the back of the blade (2) form an inverted L-shaped blade; the right side of the blade (3) and the back of the blade (2) form an inverted L-shaped blade.

3. The bionic forage chopping knife according to claim 1, characterized in that: The cutting blade (7) is a boundary curve of the main cutting plane (6) and the outer contact surface (8), and is a special-shaped bionic NURBS curve; the left and right end surfaces of the top mounting surface (10) are the left side surface (1) and the right side surface (3) of the blade, respectively; the outer secondary contact surface (9) is a transition surface between the top mounting surface (10) and the outer contact surface (8); the front end side of the top mounting surface (10) is a cutter head (4); the upper end surface of the main cutting plane (6) is the inner contact surface (5), and the lower end of the main cutting plane (6) is a cutting blade (7); The upper end of the top mounting surface (10) is designed as a blade upper side surface (16), and bolt reserved holes (11) are preset on the top mounting surface (10) and the bottom mounting surface (12).

4. The bionic forage chopping knife according to claim 1, characterized in that: The upper side surface (16) of the blade is concave in the middle, and the shape of the upper side surface (16) of the blade is trapezoidal.

5. The bionic forage chopping knife according to claim 1, characterized in that: The curve AB on the inner contact surface (5) is a cycloid, which is a set of points on the trajectory of a base circle with a diameter of d when rolling along the tangent of the base circle, wherein the tangent of the base circle is fixed, and the angle between the tangent of the base circle and the straight line parallel to the X-axis is 17°.

Images