Bionic drag-reducing deep tillage shovel based on the lateral contour curve of the Jinchan head

Abstract

The bionic drag-reducing deep tillage shovel based on the lateral contour curve of the cicada head relates to a typical tillage component deep tillage shovel on agricultural tillage machinery, which is composed of an arc-shaped shovel handle and a bionic shovel tip. The soil-contacting working surface of the bionic shovel tip is obtained by proportionally enlarging and transversely stretching the lateral contour curve of the cicada head. The equation of the lateral contour curve of the cicada head is: y =‑0.0805 x 2 +1.2157 x +2.0762, x The value range is 0 mm ≤ x ≤8 mm. Angle between the connecting shovel tip and the horizontal plane α It is 20-25°. Compared with the national standard chisel-shaped deep tillage shovel, at different tillage depths, the use of the bionic deep tillage shovel based on the lateral contour curve of the cicada head of the present invention can reduce the horizontal tillage resistance of deep tillage operation by an average of 12.73%; at different tillage speeds, the use of the bionic deep tillage shovel based on the lateral contour curve of the cicada head of the present invention can reduce the horizontal tillage resistance of deep tillage operation by an average of 11.33%, which is beneficial to saving energy consumption.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural farming machinery and equipment, and in particular to a bionic drag-reducing deep tillage shovel based on the lateral contour curve of a cicada head. Background Art

[0002] Mechanized deep tillage can break the bottom layer of the farmland plow, eliminate soil compaction, promote soil water infiltration and deep rooting of crops. The deep tillage shovel is the most important working part of the deep tillage operation, and the resistance and fuel consumption of the deep tillage operation are very high. It is urgent to optimize the structure of the deep tillage shovel to reduce the resistance of the deep tillage operation, which is of great significance to promote the promotion and application of mechanized deep tillage technology.

[0003] The tillage resistance of a deep tillage shovel mainly comes from the shovel tip and the shovel handle, and the structural form of the shovel tip has an important influence on the resistance of the deep tillage shovel. Reasonable changes in the soil-contacting curved surface of the deep tillage shovel tip can reduce the tillage resistance of the deep tillage shovel.

[0004] The study found that the cicada can move freely in the soil, which is closely related to the shape of its head curve. In addition, the head of the cicada moving in the soil and the tip of the deep plowing shovel both move linearly. Therefore, applying the cicada head curve to the design of the deep plowing shovel tip has a strong theoretical basis. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a bionic drag-reducing deep tillage shovel based on the lateral contour curve of the cicada head, so as to reduce the tillage resistance of the deep tillage shovel and reduce the fuel consumption of the deep tillage operation.

[0006] The technical solution adopted by the present invention is: a bionic drag-reducing deep loosening shovel based on the lateral contour curve of the Jinchan head; it is composed of an arc-shaped shovel handle and a bionic shovel tip, and the soil-contacting working surface of the bionic shovel tip is obtained by proportionally enlarging and lateral stretching the contour curve A, and the curve equation of the contour curve A is: y=-0.0805x 2 +1.2157x+2.0762, the value range of x is 0 mm≤x≤8 mm, and the angle α between the connecting shovel tip section on the shovel handle and the horizontal plane is 20-25°.

[0007] As a preferred embodiment, the arc-shaped shovel handle comprises a shovel handle straight handle section, a shovel handle arc section and a connecting shovel tip section, wherein the angle α between the connecting shovel tip section and the horizontal plane is 23°.

[0008] As a preferred solution, the inner side surface of the arc section of the shovel handle is provided with an inner cutting edge and an outer cutting edge.

[0009] As a preferred solution, the radius of the outer cutting edge is 318-322 mm, and the radius of the inner cutting edge is 303-308 mm.

[0010] As a preferred embodiment, the bionic shovel tip is formed by connecting the shovel handle surface, the soil contact working surface, the left side surface of the shovel tip, the right side surface of the shovel tip, the first wear-resistant surface and the second wear-resistant surface, wherein the first wear-resistant surface is located at the tip of the bionic shovel tip, and the first wear-resistant surface is connected with the left side surface and the right side surface of the shovel tip respectively through the second wear-resistant surface.

[0011] As a preferred solution, the soil contact working surface is based on the contour curve of the cicada head, which is enlarged in proportion and stretched horizontally. The distance between the two end points of the curve is L 0 , the obtained curve is enlarged in proportion, and the enlargement ratio is L / L 0 ; The enlarged contour curve is stretched horizontally, and the stretching distance is B to obtain the soil contact working surface of the bionic shovel tip.

[0012] The beneficial effects of the present invention are:

[0013] Through optimized design, the bionic drag-reducing deep tillage shovel based on the lateral contour curve of the cicada head can reduce the soil disturbance area during deep tillage operations, and reduce the resistance and energy consumption of deep tillage operations. The results of indoor soil trough tests and discrete element simulation tests show that at different tillage depths (250-350 mm) and tillage speeds (0.5-2.5 m / s), the use of this bionic drag-reducing deep tillage shovel based on the lateral contour curve of the cicada head can reduce the resistance of deep tillage operations by an average of 12.03%. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a front view of the bionic drag-reducing deep tillage shovel based on the head curve of the cicada according to the present invention;

[0016] Figure 2 It is an axonometric view of the shovel tip of the bionic drag-reducing deep tillage shovel based on the head curve of the cicada according to the present invention;

[0017] Figure 3 It is a top view of the shovel tip of the bionic drag-reducing deep loosening shovel based on the head curve of the cicada according to the present invention;

[0018] Figure 4 This is the lateral contour curve of the cicada's head;

[0019] Figure 5It is a comparison diagram of the horizontal tillage resistance of the bionic drag-reducing deep tillage shovel based on the cicada head curve of the present invention and the national standard chisel-shaped deep tillage shovel under different tillage depth conditions;

[0020] Figure 6 This is a comparison chart of the horizontal tillage resistance of the bionic drag-reducing deep tillage shovel based on the cicada head curve of the present invention and the national standard chisel-shaped deep tillage shovel under different tillage speed conditions. DETAILED DESCRIPTION

[0021] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that, without further description, elements, structures and features in one embodiment may also be beneficially combined in other embodiments.

[0022] It should be noted that, unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the invention belongs. The words "one", "an" or "the" and the like used in the patent application specification and claims of the present invention do not express quantitative limitations, but indicate the existence of at least one. Words such as "include" or "comprise" indicate that the elements or objects appearing before "include" or "comprises" include the elements or objects listed after "include" or "comprises" and their equivalents, but do not exclude other elements or objects with the same function.

[0023] Embodiment 1,

[0024] The following is combined with Figure 1-6 The structure and working process of this embodiment are described in detail:

[0025] refer to Figures 1 to 3 The bionic drag-reducing deep loosening shovel based on the lateral contour curve of the Jinchan head of the present invention is composed of an arc-shaped shovel handle 1 and a bionic shovel tip 2, wherein the arc-shaped shovel handle 1 belongs to the national standard heavy-duty arc-shaped shovel handle, including a deep loosening shovel fixing hole 1-1, a shovel handle straight handle section 1-2, a shovel handle arc section 1-3, a connecting shovel tip section 1-4, and a shovel handle connecting hole. 1-5 and the shovel handle connecting hole II1-6, wherein the angle between the connecting shovel tip section 1-4 and the horizontal plane (i.e., the soil entry angle) α is 20-25°, and 23° is preferably used in this embodiment, the shovel handle width a is 80 mm, the total height H is 706.5 mm, and the outer arc radius R 0 The inner side of the arc section of the shovel handle is provided with an inner cutting edge and an outer cutting edge, wherein the radius of the outer cutting edge is 318-322 mm, and the radius of the inner cutting edge is 303-308 mm; in this embodiment, the outer diameter of the cutting edge R 1 The inner diameter of the cutting edge is 305 mm. 2 It is 279mm;

[0026] The length L of the bionic shovel tip 2 is 165 mm, the width B is 40 mm, and the shovel tip 2 includes a shovel handle surface 2-1, a soil contact working surface 2-2, and a shovel tip connection hole. 2-3, shovel tip connecting hole II 2-4, shovel tip left side 2-5, shovel tip right side 2-6, first wear-resistant surface 2-7 and second wear-resistant surface 2-8, wherein the bionic shovel tip 2 is formed by connecting the shovel handle surface 2-1, the soil contact working surface 2-2, the shovel tip left side 2-5, the shovel tip right side 2-6, the first wear-resistant surface 2-7 and the second wear-resistant surface 2-8, wherein the first wear-resistant surface 2-7 is located at the tip of the bionic shovel tip 2, and the first wear-resistant surface 2-7 is connected with the shovel tip left side 2-5 and the shovel tip right side 2-6 respectively through the second wear-resistant surface 2-8; the bionic shovel tip 2 and the arc-shaped shovel handle 1 are connected through the shovel handle connecting hole 1-5, Shovel handle connection hole Ⅱ 1-6, Shovel tip connection hole 2-3 and the shovel tip connecting hole II2-4 are connected by bolts; in the top view of the bionic shovel tip 2, the first wear-resistant surface 2-7 and the second wear-resistant surface 2-8 are projected to be two arc curves with radii of 4mm and 40mm respectively, and the two arc curves are tangent to each other, and the straight lines obtained by projecting the left side surface 2-5 and the right side surface 2-6 of the shovel tip are both tangent to the arc curve obtained by projecting the second wear-resistant surface 2-8.

[0027] In this embodiment, the soil contact working surface 2-2 is obtained by proportionally enlarging and stretching the contour curve of the cicada head. The specific process is: make two marking dots on the cicada head, record the actual distance between the two points, take a photo of the side head of the cicada, import the picture into AutoCAD software, mark the size between the two marking points, and scale the entire picture in proportion. The scaling ratio is the ratio of the actual size between the two marking points to the marked size. The scaled side contour of the cicada head is plotted, and the curve is fitted using Excel software. The curve equation obtained by fitting is:

[0028] y =-0.0805 x 2 +1.2157 x +2.0762

[0029] In the formula, the value range of x is 0 mm ≤x ≤ 8 mm. The lateral profile curve of the cicada head obtained by fitting is as follows: Figure 4 As shown, the distance between the two endpoints of the curve is L 0 The obtained curve is enlarged in proportion, and the enlargement ratio is L / L 0 ; The enlarged contour curve is stretched laterally, the stretching distance is B, and then the soil contact working surface 2-2 of the bionic shovel tip 2 is obtained.

[0030] Figure 5 and Figure 6 The figures show a comparison of the horizontal tillage resistance of the bionic drag-reducing deep tillage shovel based on the lateral contour curve of the cicada head of the present invention and the national standard chisel-shaped deep tillage shovel under different tillage depths and different tillage speeds. The results of indoor soil trough test and discrete element simulation test show that, compared with the national standard chisel-shaped deep tillage shovel, at different tillage depths (250-350 mm), the use of the bionic drag-reducing deep tillage shovel based on the lateral contour curve of the cicada head of the present invention can reduce the horizontal tillage resistance of the deep tillage operation by an average of 12.73%; at different tillage speeds (0.5-2.5 m / s), the use of the bionic drag-reducing deep tillage shovel based on the lateral contour curve of the cicada head of the present invention can reduce the horizontal tillage resistance of the deep tillage operation by an average of 11.33%.

[0031] Parts of the present invention not described in detail are prior art.

[0032] It should be noted that although the present invention is described by the above embodiments, the present invention may also have other various embodiments. Without departing from the spirit and scope of the present invention, it is obvious that those skilled in the art may make various corresponding changes and deformations to the present invention, but these changes and deformations should all fall within the scope of protection of the appended claims of the present invention and their equivalents.

Claims

1. The bionic drag-reducing deep tillage shovel based on the lateral contour curve of the Jinchan head is characterized by: It consists of an arc-shaped shovel handle and a bionic shovel tip. The soil-contacting working surface of the bionic shovel tip is obtained by proportionally enlarging and horizontally stretching the contour curve A. The curve equation of the contour curve A is: y=-0.0805x 2 +1.2157x+2.0762, the value range of x is 0 mm ≤x≤8 mm, the angle α between the connecting shovel tip section on the shovel handle and the horizontal plane is 20-25°; the bionic shovel tip is surrounded by the connecting shovel handle surface, the soil contact working surface, the left side of the shovel tip, the right side of the shovel tip, the first wear-resistant surface and the second wear-resistant surface, wherein the first wear-resistant surface is located at the tip of the bionic shovel tip, and the first wear-resistant surface is connected to the left side and the right side of the shovel tip through the second wear-resistant surface; the soil contact working surface is based on the contour curve of the cicada head, which is enlarged in proportion and stretched horizontally, and the distance between the two end points of the curve is L 0, the obtained curve is enlarged in proportion, the enlargement ratio is L / L 0; the enlarged contour curve is stretched horizontally, and the stretching distance is B to obtain the soil contact working surface of the bionic shovel tip.

2. The bionic drag-reducing deep tillage shovel based on the lateral contour curve of the cicada head according to claim 1, characterized in that: The arc-shaped shovel handle comprises a shovel handle straight handle section, a shovel handle arc section and a connecting shovel tip section, wherein the angle α between the connecting shovel tip section and the horizontal plane is 23°.

3. The bionic drag-reducing deep tillage shovel based on the lateral contour curve of the cicada head according to claim 2 is characterized by: An inner cutting edge and an outer cutting edge are arranged on the inner side surface of the arc section of the shovel handle.

4. The bionic drag-reducing deep tillage shovel based on the lateral contour curve of the cicada head according to claim 3 is characterized by: The radius of the outer cutting edge is 318-322 mm, and the radius of the inner cutting edge is 303-308 mm.

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