Golden cicada bionic sweet potato digging shovel and harvester thereof
By using a sweet potato digging shovel designed with the cicada's forepaws as a biomimetic design, the problems of high resistance and unsatisfactory sweet potato-soil separation of existing digging shovels have been solved, achieving low-resistance and high-efficiency sweet potato harvesting results.
Patent Information
- Application Number
- CN202520297101.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-02-24
AI Technical Summary
Existing sweet potato digging shovels are prone to getting tangled in grass and clay during digging, resulting in high digging resistance and unsatisfactory separation of sweet potato and soil. This leads to high energy consumption of the machines, making it difficult to meet the needs of large-scale sweet potato planting.
The biomimetic design of the cicada's forelegs is adopted to design the outline shape and structural features of the biomimetic shovel teeth, including the radius of curvature, thickness, arrangement, guide groove and ω angle of the biomimetic shovel teeth. Combined with the smooth soil lifting section and installation section, the cicada biomimetic sweet potato digging shovel is formed, which is adapted to the traction speed of the harvester to reduce digging resistance.
It significantly reduces digging resistance, improves the separation of sweet potatoes and soil, reduces soil particle changes, reduces mechanical vibration and energy consumption, and achieves efficient sweet potato harvesting.
Smart Images
Figure CN223816505U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of agricultural machinery technology, specifically to a cicada-inspired sweet potato digging shovel and its harvester. Background Technology
[0002] The digging of sweet potatoes is an important step in the harvesting process. The performance of the digging shovel directly affects the harvesting results. It is required to have good soil breaking ability and digging resistance, dig up the sweet potatoes with as little soil disturbance as possible, minimize clay and grass entanglement, and ensure that the sweet potatoes are separated from the soil as thoroughly as possible, while minimizing omissions and damage to the sweet potatoes.
[0003] Existing sweet potato digging shovels are mainly flat shovels, concave shovels, trough shovels, and grid shovels. These shovels are either prone to getting tangled in grass and clay, resulting in high digging resistance, or they are not effective in separating sweet potatoes from soil, leading to high machine energy consumption.
[0004] As the scale of sweet potato cultivation continues to expand, these traditional digging shovels are no longer sufficient for high-intensity digging work.
[0005] Therefore, it is crucial to design a sweet potato digging shovel with low digging resistance and good soil separation effect. Utility Model Content
[0006] In a first aspect, to solve the above-mentioned technical problems, this utility model provides a cicada-inspired sweet potato digging shovel, comprising a digging shovel body, the digging shovel body comprising:
[0007] The soil-entry section has biomimetic shovel teeth. The outline shape of the biomimetic shovel teeth is obtained by fitting the three-dimensional scanning data of the cicada's forelegs. The radius of curvature of the tip of the biomimetic shovel teeth is 3-5mm, the thickness of the root of the biomimetic shovel teeth is 8-10mm, and the biomimetic shovel teeth gradually thin from the root to the tip to 2-3mm.
[0008] The soil-lifting section has a smooth plane, and the soil-lifting section is smoothly connected to the soil-entry section; and
[0009] The installation section is equipped with countersunk holes for installation bolts.
[0010] Furthermore, the fitting curve equation for the contour shape of the biomimetic shovel teeth... Satisfying the expression:
[0011]
[0012] in, , , , Coefficient of determination Sum of squared errors .
[0013] Furthermore, the biomimetic shovel teeth are evenly arranged in 7-9 pieces.
[0014] Furthermore, the tooth gap of the biomimetic shovel teeth is 50±2mm.
[0015] Furthermore, the back of the bionic shovel tooth is provided with a guide groove, and the depth of the guide groove is 1-2mm.
[0016] Furthermore, the biomimetic shovel teeth have an ω angle of 40°-50° in contact with the soil during operation.
[0017] Furthermore, the length of the soil-penetrating section accounts for 20%-25% of the length of the excavating shovel body; the length of the soil-lifting section accounts for 40%-50% of the length of the excavating shovel body.
[0018] Furthermore, the mounting section is a rectangular plane, and two countersunk bolt holes are symmetrically arranged at the two corners of the mounting section.
[0019] In a second aspect, this utility model provides a harvester, including a harvester body, wherein the soil-entry part of the harvester body is equipped with the aforementioned cicada-inspired sweet potato digging shovel.
[0020] Furthermore, the traction speed of the harvester body is adapted to a range of 0.6-1.0 m / s to match the drag reduction characteristics of the digging shovel, so that the digging resistance of the digging shovel is ≤6000N.
[0021] Compared with the prior art, the present invention has the following beneficial effects:
[0022] This invention utilizes a cicada-inspired sweet potato digging shovel whose outline shape is fitted from three-dimensional scanning data of the cicada's forelegs, significantly reducing digging resistance. At the same time, the soil particle rate changes less during digging, the soil particle distribution is more uniform, and it is more conducive to separating sweet potato from soil. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the overall structure disclosed in the embodiment of this utility model;
[0024] Figure 2 Figure 1 shows the structure of the cicada's forelegs before and after treatment, as disclosed in this embodiment of the utility model. Figure 2a shows the structure of the cicada's forelegs before treatment, and Figure 3b shows the structure of the cicada's forelegs after treatment.
[0025] Figure 3 This is a fitting diagram of the shovel surface contour curve disclosed in the embodiment of this utility model;
[0026] Figure 4This is a fitting diagram of the shovel tip contour curve disclosed in an embodiment of this utility model.
[0027] In the picture:
[0028] 100. Excavator shovel body;
[0029] 110. Soil-penetrating section; 111. Bionic shovel teeth;
[0030] 120. Soil-lifting section;
[0031] 130. Installation section; 131. Bolt countersunk hole. Detailed Implementation
[0032] To make the technical solutions and effects of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.
[0033] As an insect that lives in the soil year-round, the cicada has developed unique advantages in the shape of its forelegs over hundreds of millions of years of evolution, setting it apart from other insects. Its forelegs enable it to maintain balance and stability when moving in the soil, and their streamlined shape reduces soil resistance.
[0034] In contrast, the sharp claws of moles and pangolins can easily damage the outer skin of sweet potatoes.
[0035] Ordinary excavators cause only minor soil cracking, leaving large clumps of soil on the surface. However, when using cicada claws as a biomimetic excavator, the ω angle increases during operation. The streamlined claws can cut the soil, guide soil particles, reduce lateral tilting caused by mechanical vibration, improve stability, and avoid increasing overall energy consumption due to vibration and tilting. Therefore, the biomimetic structure design of the excavator adopts the shape of cicada claws.
[0036] Please see Figure 1-2 The cicada-inspired sweet potato digging shovel includes a digging shovel body 100, which mainly consists of three parts: an entry section 110, a lifting section 120, and an installation section 130.
[0037] The entry section 110 is the front end of the excavator body 100, which is equipped with biomimetic shovel teeth 111 for breaking the soil, cutting, and harvesting sweet potatoes.
[0038] Lifting section 120: This is the middle section of the digging shovel body 100, which is a smooth transition surface used to lift and separate the potato-soil mixture.
[0039] Installation section 130: This is the end of the digging shovel body 100, which is equipped with a standardized mechanical interface that can be adapted to mainstream harvesters.
[0040] First, let's explain section 110, which is the part that enters the ground.
[0041] The soil entry section 110 adopts a biomimetic design concept and features biomimetic shovel teeth 111. The outline shape of the biomimetic shovel teeth 111 is obtained by fitting the three-dimensional scanning data of the cicada's forelegs.
[0042] In a further embodiment, please refer to Figure 3-4 Curve fitting of the cicada's forelegs was performed using Origin. Data points were extracted from the upper and lower halves of the forelegs, and then curve fitting analysis was performed. Data points were also extracted from the tip of the cicada's forelegs, and then curve fitting analysis was performed.
[0043] The fitting curve equation of the contour shape of the biomimetic shovel tooth 111 Satisfying the expression:
[0044]
[0045] in, , , , Coefficient of determination Sum of squared errors .
[0046] The tip of the biomimetic shovel tooth 111 has a radius of curvature of 3-5mm, which conforms to the Mohr-Coulomb soil shear failure theory, causing the soil layer to break into uniform blocks (particle size ≤10cm) and reducing the adhesion of fine soil particles.
[0047] The biomimetic shovel tooth 111 has a root thickness of 8-10mm, which gradually thins to 2-3mm from the root to the tip. This ensures structural strength while reducing soil penetration resistance; field trials show a 7.82% reduction in resistance.
[0048] The biomimetic shovel teeth 111 are evenly arranged in 7-9 pieces.
[0049] The tooth gap of the bionic shovel tooth 111 is 50±2mm.
[0050] The back of the bionic shovel tooth 111 is equipped with a guide groove with a depth of 1-2mm, which improves the clay stripping efficiency by 23%.
[0051] The bionic shovel teeth 111 have an ω angle of 40°-50° in contact with the soil when in operation. By dynamically adjusting and balancing the cutting force and lifting force, it avoids the phenomenon of "getting stuck" or "jumping".
[0052] Next, the soil-lifting section 120 will be explained.
[0053] The soil lifting section 120 has a smooth plane, and the soil lifting section 120 is smoothly connected to the soil entering section 110.
[0054] The soil lifting section 120 can be set with an inclination angle of 15°-25° to achieve uniform lifting of the potato-soil mixture along the shovel surface, reducing the risk of potato tuber collision damage.
[0055] The length of the soil entry section 110 accounts for 20%-25% of the length of the excavator shovel body 100; the length of the soil lifting section 120 accounts for 40%-50% of the length of the excavator shovel body 100. By extending the lifting path of the soil lifting section 120, gravity grading is achieved, allowing more than 90% of the soil clods to fall off naturally during the lifting process.
[0056] Finally, the installation section 130 will be described.
[0057] The mounting section 130 is a rectangular plane with countersunk holes 131 for mounting bolts.
[0058] Two countersunk bolt holes 131 are symmetrically provided at the two corners of the installation section 130.
[0059] This utility model also protects a harvester equipped with the cicada-inspired sweet potato digging shovel, including a harvester body, wherein the traction speed of the harvester body is adapted to a range of 0.6-1.0 m / s to match the drag reduction characteristics of the digging shovel, so that the digging resistance of the digging shovel is ≤6000N.
[0060] The parameters of the bionic digging shovel and the ordinary digging shovel were set and simulated using EDEM software. The results show that at different harvester speeds, such as 0.6 m / s, 0.8 m / s, and 1 m / s, the resistance of the bionic digging shovel is significantly lower than that of the ordinary digging shovel, with drag reduction performance improvements of 16.38%, 15.19%, and 14.03%, respectively.
[0061] Meanwhile, the dynamic changes of soil particles under the two digging shovel motion states were observed. The results showed that, compared with ordinary digging shovels, the cicada-inspired digging shovel exhibited smaller changes in soil particle velocity and a more uniform distribution of soil particles.
[0062] Through a field digging performance comparison test, with the harvester's traction speed at 0.6 m / s, the digging resistance was measured using strain gauge sensors. The results showed that the average resistance of the bionic digging shovel and the ordinary digging shovel were 5805.3 N and 6298.4 N, respectively. That is, the average drag reduction rate of the bionic digging shovel was 7.82%.
[0063] In other words, the cicada-inspired sweet potato digging shovel provided by this utility model has the advantages of reducing drag and energy consumption.
[0064] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A cicada-inspired sweet potato digging shovel, characterized in that, Includes a digging shovel body (100), the digging shovel body (100) comprising: The soil-entry section (110) has biomimetic shovel teeth (111). The outline shape of the biomimetic shovel teeth (111) is obtained by fitting the three-dimensional scanning data of the cicada's forelegs. The radius of curvature of the tip of the biomimetic shovel teeth (111) is 3-5 mm. The thickness of the root of the biomimetic shovel teeth (111) is 8-10 mm. The biomimetic shovel teeth (111) gradually thins to 2-3 mm from the root to the tip. The soil-lifting section (120) has a smooth plane, and the soil-lifting section (120) is smoothly connected to the soil-entry section (110); and The installation section (130) is provided with countersunk holes (131) for installation bolts.
2. The cicada-inspired sweet potato digging shovel according to claim 1, characterized in that, The fitting curve equation of the contour shape of the biomimetic shovel tooth (111) Satisfying the expression: in, , , , Coefficient of determination Sum of squared errors .
3. The cicada-inspired sweet potato digging shovel according to claim 1, characterized in that, The biomimetic shovel teeth (111) are evenly arranged in 7-9 pieces.
4. The cicada-inspired sweet potato digging shovel according to claim 1 or 3, characterized in that, The gap between the biomimetic shovel teeth (111) is 50±2mm.
5. The cicada-inspired sweet potato digging shovel according to claim 1, characterized in that, The back of the bionic shovel tooth (111) is provided with a flow guide groove, and the depth of the flow guide groove is 1-2mm.
6. The cicada-inspired sweet potato digging shovel according to claim 1, characterized in that, The biomimetic shovel teeth (111) have an ω angle of 40°-50° in contact with the soil when in operation.
7. The cicada-inspired sweet potato digging shovel according to claim 1, characterized in that, The length of the soil-penetrating section (110) accounts for 20%-25% of the length of the excavator body (100); the length of the soil-lifting section (120) accounts for 40%-50% of the length of the excavator body (100).
8. The cicada-inspired sweet potato digging shovel according to claim 1, characterized in that, The mounting section (130) is a rectangular plane, and two countersunk bolt holes (131) are symmetrically arranged at the two corners of the mounting section (130).
9. A harvester, characterized in that, The harvester body includes a soil-entry portion of the harvester body equipped with a cicada-inspired sweet potato digging shovel as described in any one of claims 1-8.
10. The harvester according to claim 9, characterized in that, The traction speed of the harvester body is adapted to a range of 0.6-1.0 m / s to match the drag reduction characteristics of the digging shovel, so that the digging resistance of the digging shovel is ≤6000N.