High-efficiency low-resistance bionic subsoiler handle based on lateral profile curve of fox claw toe

Abstract

An efficient low-resistance bionic subsoiling shovel handle based on lateral profile curves of fox toes is formed by sequentially connecting a rack connecting section, a shovel handle working section and a shovel tip connecting section, and the shovel handle working section is provided with a shovel handle cutting edge profile line, a shovel handle working section inner directrix and a shovel handle working section outer directrix. The shovel handle cutting edge contour line, the shovel handle working section inner directrix and the shovel handle working section outer directrix are all bionic curves with consistent concave directions, the prototypes of the bionic curves are fox toes, and a curvilinear equation is obtained through reverse engineering. According to the efficient low-resistance bionic subsoiler handle based on the lateral profile curve of the fox toe, the lateral profile curve of the fox toe is applied to the profile design of the subsoiler handle, and the unique bionic structure of the subsoiler handle can reduce the accumulation effect of soil particles in the subsoiling operation process and promote flowing of the soil particles; the horizontal tillage resistance in the deep scarification operation process can be effectively reduced, and the tillage efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of agricultural farming machinery and equipment, and in particular to a high-efficiency, low-resistance bionic deep tillage shovel handle based on a lateral contour curve of a fox's paw toe. Background Art

[0002] Deep tillage can break the hard plow bottom layer formed by long-term plowing or stubble removal, improve the tillage layer structure, greatly improve the soil's ability to store water and resist drought and drain waterlogging, and improve the absorption of water and fertilizer by crop roots. The deep tillage shovel is the core working part of the deep tillage and land preparation operation of agricultural machinery, mainly including the shovel handle and shovel tip. The high-performance shovel handle structure can reduce the resistance of the deep tillage shovel, increase the soil disturbance area, and thus reduce the energy consumption of deep tillage operation and improve the efficiency of deep tillage operation.

[0003] At present, the shovel handles of deep tillage shovels used in the market are still the national standard arc-shaped shovel handles and straight-line shovel handles, which still have problems such as large working resistance, high fuel consumption and low tillage efficiency. In recent years, many studies have applied the principles of bionics to deep tillage resistance reduction and consumption reduction technology. For example, the patent "Bionic drag-reducing deep tillage shovel handle based on power function curve" with authorization announcement number CN103797906B can reduce the resistance of deep tillage operations by 9%; another example is the patent "A bamboo rat and ant lion coupled bionic drag-reducing deep tillage shovel" with application publication number CN109874416A, which can reduce resistance by 15-20% compared with traditional eccentric column deep tillage shovels. Although the bionic deep tillage shovel handles proposed by predecessors can reduce the operating resistance of deep tillage shovels to a certain extent, most of them are only applicable to specific tillage depth and tillage speed conditions, and have not optimized the design of the deep tillage shovel's entry angle into the soil, and have not considered the improvement of tillage efficiency at the same time.

[0004] Therefore, optimizing the handle structure of the deep tillage shovel can further reduce tillage resistance and improve tillage efficiency, which is of great significance to the design of high-efficiency and low-resistance deep tillage equipment and the development of agricultural machinery deep tillage and land preparation technology. Summary of the invention

[0005] In order to solve the above technical problems, the purpose of the present invention is to provide a high-efficiency, low-resistance bionic deep tillage shovel handle based on the lateral contour curve of the fox paw toe, so as to reduce the resistance of deep tillage operation and improve the tillage efficiency of deep tillage of agricultural machinery.

[0006] The technical solution adopted by the present invention is: a high-efficiency and low-resistance bionic deep plowing shovel handle based on the lateral contour curve of a fox paw toe, the bionic deep plowing shovel handle is formed by sequentially connecting a frame connecting section, a shovel handle working section and a shovel tip connecting section, wherein the shovel handle working section has a shovel handle cutting edge contour line, a shovel handle working section inner directrix and a shovel handle working section outer directrix, the inclined surface between the shovel handle cutting edge contour line and the shovel handle working section inner directrix is ​​the cutting edge inclined surface of the deep plowing shovel handle, the shovel handle cutting edge contour line, the shovel handle working section inner directrix and the shovel handle working section outer directrix are all concave and consistent bionic curves, and the equation of the bionic curve is y=-0.0002x3+0.0013x2+0.3511x+ 9.535, wherein the value range of x is: 0≤x≤50.76 mm.

[0007] As a preferred solution, the cross-sectional contour curve of the cutting edge slope constitutes a shovel handle cutting edge element line, and the shovel handle cutting edge element line is two curves symmetrically arranged with each other, and the angle between the two curves is 55-65°.

[0008] As a preferred solution, the angle between the two shovel handle cutting edge element lines is 60°.

[0009] As a preferred solution, the cutting edge contour line of the shovel handle is parallel to the inner directrix of the shovel handle working section.

[0010] As a preferred solution, the angle α between the shovel tip connecting section and the horizontal plane is 25-38°.

[0011] As a preferred embodiment, the angle α between the shovel tip connecting section and the horizontal plane is 33°.

[0012] As a preferred solution, the rack connecting section is provided with a plurality of mounting holes, and the plurality of mounting holes are arranged at intervals along the length direction of the rack connecting section.

[0013] The beneficial effects of the present invention are: The present invention, through optimized design, applies the lateral contour curve of the fox's paw to the contour design of the deep plowing shovel handle, and its unique bionic structure can reduce the accumulation of soil particles and promote the flow of soil particles during the deep plowing operation. It can effectively reduce the horizontal tillage resistance during the deep plowing operation and improve the tillage efficiency.

[0014] The results of discrete element simulation experiments show that at different tillage depths (250-350 mm) and tillage speeds (0.5-2.5 m / s), the use of this high-efficiency, low-resistance bionic deep tillage shovel handle based on the lateral contour curve of the fox paw toe can reduce the horizontal tillage resistance by 32.3% and increase the tillage efficiency by 48.8%. The above data prove that this scheme has good comprehensive tillage performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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.

[0016] Figure 1 This is a schematic diagram of the structure of the bionic deep tillage shovel handle of the present invention; Figure 2 It is a left view of the bionic deep tillage shovel handle of the present invention; Figure 3 This is a side view of the 3D point cloud model of a fox’s paw; Figure 4 This is the bionic curve diagram of the deep tillage shovel handle; Figure 5 The graph of the horizontal tillage resistance change of the bionic deep tillage shovel at different soil penetration angles; Figure 6 A comparison diagram of the horizontal tillage resistance of the bionic deep tillage shovel of the present invention and the national standard arc-shaped deep tillage shovel under different tillage depth conditions; Figure 7 It is a comparison diagram of the horizontal tillage resistance of the bionic deep tillage shovel of the present invention and the national standard arc deep tillage shovel under different tillage speed conditions; Figure 8 It is a comparison diagram of the tillage efficiency of the bionic deep tillage shovel of the present invention and the national standard arc deep tillage shovel under different tillage depth conditions; Fig. 9 It is a comparison diagram of the tillage efficiency of the bionic deep tillage shovel of the present invention and the national standard arc deep tillage shovel under different tillage speed conditions; Figure markings: 1, frame connecting section, 2, deep loosening shovel mounting hole, 3, shovel handle cutting edge contour line, 4, shovel handle working section inner alignment line, 5, shovel handle working section outer alignment line, 6, shovel handle working section, 7, shovel tip connecting section, 8, shovel handle cutting edge element line, 9, fox claw toe lateral inner contour curve. DETAILED DESCRIPTION

[0017] 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.

[0018] 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.

[0019] The following is combined with Figure 1-9 The structural composition of the bionic deep tilling shovel handle of the present invention and the working condition of the deep tilling shovel equipped with the bionic deep tilling shovel handle are described in detail: like Figure 1 As shown, a high-efficiency and low-resistance bionic deep tillage shovel handle based on the lateral contour curve of the fox paw toe is provided. The deep tillage shovel handle is composed of a frame connecting section 1, a shovel handle working section 6 and a shovel tip connecting section 7 connected in sequence, and can also be formed in an integrated manner; the frame connecting section 7 is provided with a plurality of deep tillage shovel mounting holes 2, and the plurality of deep tillage shovel mounting holes 2 are arranged at intervals along the length direction of the frame connecting section 7. The deep tillage shovel handle is fixed to the mobile machinery through the mounting holes 2, and the shovel handle working section 6 has a shovel handle cutting edge contour line 3, a shovel handle working section inner directrix 4 and a shovel handle working section outer directrix 5, the shovel handle cutting edge contour line 3 is parallel to the shovel handle working section inner directrix 4, and the shovel handle cutting edge contour line 3, the shovel handle working section inner directrix 4 and the shovel handle working section outer directrix 5 all adopt a bionic curve with consistent concave direction, and the equation of the bionic curve is y=-0.0002x3+0.0013x2+0.3511x+ 9.535, wherein the value range of x is: 0≤x≤50.76 mm; it can also be understood that the shovel handle cutting edge contour line 3, the shovel handle working section inner directrix 4 and the shovel handle working section outer directrix 5 are all obtained by proportionally enlarging the curve segments obtained by the above-mentioned bionic curve equation within the limited value range; this scheme proposes to design the shovel handle cutting edge contour line 3, the shovel handle working section inner directrix 4 and the shovel handle working section outer directrix 5 into the structural form of the inner contour curve of the claw toe of an animal fox with excellent digging performance, and the curve function expression is in the form of a polynomial. Through this bionic design, the tillage resistance of the deep tillage shovel handle can be effectively reduced.

[0020] It should be noted that the prototype of the bionic curve mentioned above is the fox claw toe. The fox is an animal that is good at digging holes. The fox has sharp claws on the toes, which enables it to dig holes quickly in the soil. This shows that the structural curve of the fox claw toe has a good soil cutting function. Therefore, the application of the lateral contour curve of the fox claw toe to the structural design of the high-efficiency and low-resistance deep loosening shovel handle has a good theoretical basis. This application extracts the fox claw toe structure through reverse engineering, uses a 3D scanner to perform a 360° scan of the fox claw toe, obtains a complete three-dimensional point cloud model of the claw toe, intercepts the boundary curve on the 3D scanned model of the fox claw toe, imports the image into a two-dimensional drawing software, uses the spline curve control point command of the software to draw the lateral inner contour curve 9, collects the coordinates of the curve points, and uses Matlab to perform polynomial fitting on the point cloud data to obtain the bionic curve equation y=-0.0002x3+0.0013x2+0.3511x+ 9.535, where the value range of x is: 0≤x≤50.76. The schematic diagram of the bionic curve is as follows: Figure 4 As shown, the coefficient of determination R2=0.9984 (an indicator used in statistics to measure the degree of fit of the regression model to the data. The closer the R² value is to 1, the higher the degree of explanation of the model for the data and the better the fitting effect). The degree of fit is high, which provides a reliable mathematical model for the design of the bionic deep tillage shovel handle.

[0021] like Figure 1-4 As shown, H1 is the vertical height of the frame connecting section 1, H2 is the vertical height of the bionic shovel handle working section 6, and H3 is the vertical height of the shovel tip connecting section 7; the shovel handle cutting edge contour line 3, the shovel handle working section inner guideline 4 and the shovel handle working section outer guideline 5 all adopt bionic curves with consistent concave directions.

[0022] In this embodiment, the inclined surface between the shovel handle cutting edge contour line 3 and the shovel handle working section inner directrix 4 is the cutting edge inclined surface of the deep loosening shovel handle, and the cross-sectional contour curve of the cutting edge inclined surface constitutes the shovel handle cutting edge element line 8, and the shovel handle cutting edge element line 8 is two curves symmetrically arranged with each other. Figure 1 It can be seen that the handle edge element line 8 starts from the handle cutting edge contour line 3 and ends at the handle working section inner directrix 4, and the angle between the two curves is 55-65°, preferably 60°; the shovel tip connecting section 7 is tangent to the handle working section 6, and the angle α between the shovel tip connecting section and the horizontal plane is recommended to be 25-38°, such as Figure 5 As shown in the figure, after the optimization test of the entry angle, the best entry angle was found to be α=33°.

[0023] Figure 6-9The following are comparison diagrams of horizontal tillage resistance and tillage efficiency between a deep tillage shovel equipped with the high-efficiency and low-resistance bionic deep tillage shovel handle based on the lateral contour curve of the fox claw toe of the present invention and a national standard arc-shaped deep tillage shovel under different tillage depths and different tillage speeds. The results of discrete element simulation test show that, compared with the national standard arc-shaped deep tillage shovel, at different tillage depths (250-350 mm), the use of the bionic deep tillage shovel of the present invention can reduce the horizontal tillage resistance of deep tillage operation by 32.3%, and improve the tillage efficiency by 48.8%; at different tillage speeds (0.5-2.5 m / s), the bionic deep tillage shovel can reduce the horizontal tillage resistance of deep tillage operation by 26.5%, and improve the tillage efficiency by 27.0%.

[0024] The names and dimensions of other unmarked parts are designed in accordance with the provisions of the Mechanical Industry Standard of the People's Republic of China JB / T9788-1999 "Subsoiler and Subsoiler Handle".

[0025] The parts not described in detail in this embodiment are prior art.

[0026] 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. A high-efficiency, low-resistance bionic deep-plowing shovel handle based on the lateral contour curve of a fox's paw toe, the bionic deep-plowing shovel handle is formed by sequentially connecting a frame connection section, a shovel handle working section, and a shovel tip connection section, wherein the shovel handle working section has a shovel handle cutting edge contour line, a shovel handle working section inner alignment line, and a shovel handle working section outer alignment line, and the inclined surface between the shovel handle cutting edge contour line and the shovel handle working section inner alignment line is the cutting edge inclined surface of the deep-plowing shovel handle, characterized in that: The shovel handle cutting edge contour line, the shovel handle working section inner directrix and the shovel handle working section outer directrix are all concave bionic curves, and the equation of the bionic curve is y=-0.0002x 3 +0.0013x 2 +0.3511x+ 9.535, where the value range of x is: 0≤x≤50.76 mm.

2. The high-efficiency, low-resistance bionic deep tillage shovel handle based on the lateral contour curve of the fox paw toe according to claim 1, characterized in that: The cross-sectional contour curve of the cutting edge slope constitutes the cutting edge element line of the shovel handle, and the cutting edge element line of the shovel handle is two curves symmetrically arranged with each other, and the angle between the two curves is 55-65°.

3. The high-efficiency, low-resistance bionic deep tillage shovel handle based on the lateral contour curve of the fox paw toe according to claim 2, characterized in that: The included angle between the two shovel handle cutting edge lines is 60°.

4. The high-efficiency, low-resistance bionic deep tillage shovel handle based on the lateral contour curve of the fox paw toe according to claim 1, characterized in that: The cutting edge contour line of the shovel handle is parallel to the inner directrix of the working section of the shovel handle.

5. The high-efficiency, low-resistance bionic deep tillage shovel handle based on the lateral contour curve of the fox paw toe according to claim 1, characterized in that: The angle α between the shovel tip connecting section and the horizontal plane is 25-38°.

6. The high-efficiency, low-resistance bionic deep tillage shovel handle based on the lateral contour curve of the fox paw toe according to claim 5, characterized in that: The included angle α between the shovel tip connecting section and the horizontal plane is 33°.

7. The high-efficiency, low-resistance bionic deep tillage shovel handle based on the lateral contour curve of the fox paw toe according to claim 1, characterized in that: The frame connecting section is provided with a plurality of mounting holes, and the plurality of mounting holes are arranged at intervals along the length direction of the frame connecting section.

Images