CN203840742U - Bionic surface drag reduction structure of paddy field boat type machine - Google Patents

Abstract

The utility model discloses a paddy field boat-type mechanical bionic surface drag reduction structure, which is a bionic amphibian reptile belly skin pattern, and interconnected groove networks are distributed on the outer surface of the hull contacting the paddy field mud surface; When traveling at a low speed, a water film can be formed on the outer surface of the hull, which reduces the resistance of the paddy field boat-type machinery when traveling at a low speed in the paddy field. The adhesion and friction between the hull surface and the mud surface, the water on the outside of the hull will continuously supplement the consumption when forming a water film along the connected groove, and the water film is formed continuously, thereby reducing the resistance of the hull when it is moving. The utility model has low cost and is also suitable for boat-type machinery in environments such as tidal flats and swamps.

Description

A bionic surface drag reduction structure of paddy field boat type machinery

technical field

The utility model relates to the field of agricultural machinery, in particular to a bionic surface drag-reducing structure of paddy field boat-type machinery. the

Background technique

At present, paddy field boat-type machinery is widely used in paddy field operation machinery for carrying and walking, mainly including single-hull and multi-hull: single-hull such as rice transplanter, the transplanting mechanism is carried by one hull; multi-hull such as stepping rice transplanter, the transplanting mechanism is carried by one hull The two hulls share the weight. The hull of paddy field boat machinery mainly plays the role of carrying weight, and the outer surface of the hull is generally smooth to reduce resistance during walking. However, when the paddy field boat machinery walks in the paddy field at a low speed, the resistance will be much greater than that at a high speed. This is due to the weight of the hull, and the hull will discharge the accumulated water on the mud surface in the paddy field, making the hull smooth. The outer surface is in close contact with the mud surface, resulting in greater adhesion. In actual operation, the walking speed of paddy field boat machinery is generally slow, which leads to a very serious problem of resistance when walking in paddy fields. Biomimetic surface drag reduction technology is a research hotspot in recent years, and its application is mainly concentrated in media such as air, water, and general soil. Since paddy fields are mud or mud-water mixtures, their physical properties are complex, and there is currently no relevant application of bionic surface drag reduction in paddy fields. Research. the

Contents of the invention

The purpose of the utility model is to overcome the shortcomings in the prior art, and provide a bionic surface drag reduction structure of paddy field boat machinery, which can reduce the walking resistance of the paddy field boat machinery when it travels at a relatively low speed in the paddy field. the

The purpose of this utility model is achieved through the following technical solutions:

The utility model relates to a mechanical bionic surface drag reduction structure of a paddy field boat, which is a bionic amphibian reptile abdominal epidermis pattern, and a network of interconnected grooves is distributed on the outer surface of the hull in contact with the paddy field mud surface. the

In the groove network, the groove width of the groove 1 is 1-40 mm, and the depth is 5-50 mm; the cross-sectional shape of the groove 1 can be rectangle, trapezoid, inverted trapezoid, triangle, arc, unilateral trapezoid, One-sided triangle, but the shape is not limited thereto, such as other polygons and arcs with multiple ends. the

In the groove network, the shape of a single grid is preferably staggered rectangle, parallelogram or moire-like hexagon; the shape area of a single grid is 1-1000 cm ² , depending on the size of the hull, the surface material and the properties of the paddy field mud surface Instead, different grid shapes and areas are taken; the entire groove network is connected.

The utility model is also provided with an active supplementary groove water system, that is, one or more water nozzles 2 are installed on the front end of the hull of the paddy field boat-type machinery, and a water tank and a pressure device 3 are arranged on the paddy field boat-type machinery. 3. The water in the water tank is sent to the water spout 2 by pressure through the internal channel, and the water in the groove can be supplemented when the hull advances. the

Water spout 2 can also be installed in the groove 1 of paddy field boat machinery; the lower end of water spout 2 communicates with groove 1, and the upper end is airtightly connected with high-pressure water pipe 9; the other end of high-pressure water pipe 9 is airtightly connected to water tank and pressure device 3 . During use, the water tank and the pressure device 3 generate high pressure, and the water in the water tank is delivered to the water spout 2 through the high-pressure water pipe 9, supplementing the consumption of the groove water when the hull 10 is moving, and producing a continuous water film. the

The bionic surface drag-reducing structure of the paddy field boat-type machinery is applied to the outer surface of the paddy field, beach, and swamp boat-type machinery. the

The principle of the utility model is: (1) paddy field ship type machinery resistance is bigger when low-speed advance in the paddy field: hull is as shown in Figure 1 in the position relation in the paddy field, and there is one deck shallower continuous or not on the mud layer 5 of paddy field Continuous water layer 4, when generally smooth surface paddy field hull machinery is running at rest or at a relatively low speed on the mud layer 5 of the paddy field, due to the weight of the hull carrying the fuselage, a large pressure is generated between the outer surface of the hull and the mud surface, and the hull The water layer 4 is discharged, but the displacement volume of the hull in the water layer 4 is relatively small, and insufficient buoyancy can not be produced. The hull must rely on the mud layer 5 to support the weight of the fuselage, which makes the hull surface in close contact with the mud layer 5, resulting in a large Adhesion leads to greater resistance when paddy field boat machinery starts from a standstill or runs at a low speed. (2) The bionic surface drag-reducing structure of the utility model can form a water film on the outer surface of the hull, thereby reducing the traveling resistance of the hull at low speed: as shown in Figure 5, when the outer surface 6 of the hull and the mud layer 5 are extruded , due to the tension in the mud layer 5, a part of the groove water 7 will remain in the groove 1, and the groove water 7 communicates with the water layer around the hull through the groove network; 5, the groove water 7 will be brought out, and will be evenly attached between the outer surface 6 of the hull and the mud layer 5, forming a water film 8; Figure 6 shows the water film generated by the groove network on the local hull surface Schematic diagram of the principle, the solid line arrow is the direction of water entering the groove 1 from the front and side of the hull, the dotted line arrow is the direction of the water film 8 produced when the water 7 in the groove slides with the outer surface 6 of the hull and the mud surface 9, and the water film 8 is uniform Attached to the outer surface 6 of the hull; due to the interconnection of the groove network, while forming the water film 8, negative pressure is generated in the groove 1, and the water layer on the outside of the hull will continuously enter through the groove network to supplement the water film 8 When the consumption of groove water 7, continuous water film 8 can be produced when the hull runs at low speed, thereby reducing the traveling resistance of the hull. (3) The utility model is also equipped with an active supplementary groove water system to ensure the formation of the water film: when the water level in the paddy field is intermittent or the water volume is small, the outside of the hull cannot effectively replenish the groove water, which will affect the water film 8 The continuous formation of continuous formation causes the problem of relatively large traveling resistance. The utility model installs a water nozzle 2 in the front end of the hull or in the groove to actively replenish water to ensure the formation of the water film. the

Compared with the prior art, the utility model has the following advantages and beneficial effects:

(1) The principle and structure of the utility model are different from the surface of the current paddy field boat type machinery, which solves the problem of large travel resistance when running at a relatively low speed. the

(2) The cost of the utility model is low, and it is also suitable for boat-type machinery in environments such as tidal flats and swamps. the

Description of drawings

Figure 1 is a schematic diagram of the position of the hull in the upper water layer and mud layer of the paddy field

Fig. 2 is a schematic diagram of a groove network of a rectangular grid in the present invention. the

Fig. 3 is a schematic diagram of a groove network of a parallelogram grid of the present invention. the

Fig. 4 is a schematic diagram of a hexagonal grid groove network of the present invention. the

Fig. 5 is a schematic diagram of the principle of forming a water film by the bionic surface drag reduction structure of the present invention. the

Fig. 6 is a schematic diagram of the direction of water flow in the groove network. the

Fig. 7 is a schematic diagram of a groove with a rectangular cross section. the

Fig. 8 is a schematic diagram of a groove with a trapezoidal cross section. the

Fig. 9 is a schematic diagram of a groove whose cross section is an inverted trapezoid. the

Fig. 10 is a schematic diagram of a groove with a triangular cross section. the

Fig. 11 is a schematic diagram of a groove with an arc-shaped cross section. the

Fig. 12 is a schematic diagram of a groove with a single-sided trapezoidal cross section. the

Fig. 13 is a schematic diagram of a groove with a unilateral triangle in cross section. the

Fig. 14 is a schematic diagram of the principle of installing multiple water jets on the bottom surface of the hull. the

Figure 15 is a schematic diagram of the system for actively replenishing groove water. the

Fig. 16 is a graph showing the relationship between the traveling resistance and the speed of the multi-board walk-behind rice transplanter in Test Example 1 in the test paddy field. the

Fig. 17 is a comparison data diagram of resistance of test ship plate A and test ship plate B under the same conditions in Test Example 2. the

Among them, 1. Groove; 2. Water nozzle; 3. Water tank and pressure device; 4. Water layer; 5. Mud layer; 6. Outer surface of the hull; 7. Groove water; 8. Water film; 9. High pressure Water pipe; 10. Hull. the

Detailed ways

The utility model will be further described in detail below in conjunction with the examples, but the implementation of the utility model is not limited thereto. the

Example 1

The paddy field boat mechanical bionic surface drag reduction structure is a bionic amphibian reptile abdominal epidermis pattern, and there are interconnected groove networks distributed on the outer surface of the hull in contact with the paddy field mud surface. In the groove network, the groove width of the groove 1 is 1-40mm, and the depth is 5-50mm; the cross-sectional shape of the groove 1 can be rectangular (as shown in Figure 7), trapezoidal (as shown in Figure 8), Inverted trapezoid (as shown in Figure 9), triangle (as shown in Figure 10), arc (as shown in Figure 11), single-sided trapezoid (as shown in Figure 12), and single-sided triangle (as shown in Figure 13) , but the shape is not limited thereto, such as other polygons and arcs with multiple ends. In the groove network, the shape of a single grid is preferably a staggered rectangle (as shown in Figure 2), a parallelogram (as shown in Figure 3) or a moire-like hexagon (as shown in Figure 4), and the shape of a single grid The area is 1-1000cm ² , and different grid shapes and areas are adopted according to the size of the hull, the surface material and the nature of the mud surface of the paddy field.

In order to ensure the formation and maintenance of the water film, the utility model also designs an active supplementary groove water system. One or more water nozzles 2 are installed on the front of the hull of the paddy field boat machinery, and a water tank and a pressure device 3 are arranged on the paddy field boat machinery. , the groove water can be replenished when the hull advances. Water spout 2 can also be installed in the groove 1 of paddy field boat machinery, as shown in Figure 14; the lower end of water spout 2 communicates with groove 1, and the upper end is airtightly connected with high-pressure water pipe 9, as shown in Figure 15; The other end of the high-pressure water pipe 9 is airtightly connected to the water tank and the pressure device 3 . During use, the water tank and the pressure device 3 generate high pressure, and the water in the water tank is delivered to the water spout 2 through the high-pressure water pipe 9, supplementing the consumption of the groove water when the hull 10 is moving, and producing a continuous water film. the

Test example 1: Resistance experiment of multi-board walk-behind rice transplanter with smooth outer surface

The portable four-row automatic rice transplanter A purchased on the market is adopted. This model has a self-weight of 175kg, a structure of double water wheels and 3 ship boards, and the outer surface of the ship boards is smooth. The traction test of the multi-board rice transplanter was carried out in the laboratory, and the resistance data at different speeds were obtained, as shown in Figure 16. In the test speed range, the resistance of the rice transplanter is relatively high at low speed, and when the speed reaches about 0.3m/s, the resistance drops sharply, and then the resistance increases slowly with the increase of speed. It can be seen that when the paddy field boat machinery with a smooth outer surface is running on the mud surface, only when the speed reaches a certain value, the resistance conforms to the traditional law, that is, the resistance and speed are related; but at lower speeds, because the water film cannot be formed, the hull The adhesion to the mud surface in the paddy field increases, so that the resistance becomes particularly large. the

Test example 2: Comparative test of mud surface resistance between the test hull B with the bionic surface drag-reducing structure of the utility model and the test hull A with a generally smooth surface. the

(1) The environmental parameters of the paddy field are: the depth of the mud foot is 20cm, the mud surface is flat, the water layer is 2-5cm, and the clay is muddy. the

(2) Comparative sample: test hull A with smooth outer surface, 13.5kg after counterweight, 50cm×50cm×2cm in length, width and height. the

Test sample: the test hull B with the bionic surface drag-reducing structure of the utility model distributed, the weight after counterweight is 13.5kg, the length, width and height are 50cm×50cm×2cm, the outer surface is processed with a groove network, and the groove network connects the bottom surface It is divided into staggered rectangles, and the area of a single grid shape is 10cm×10cm; the cross section of the groove is rectangular, with a width of 5mm and a height of 10mm. the

(3) The test equipment includes: tension sensor, measuring range 20kg, accuracy 0.1kg; variable speed traction device, linear speed range 0.02-0.5m/s; laser speed measuring rangefinder; other auxiliary tools, such as thin steel cables, fixed brackets and cameras wait. the

(4) Two lower speed values of 0.05m/s and 0.1m/s are used for the traveling speed to verify that the water film is the main factor affecting the resistance of the hull traveling on the mud surface and the actual effect of the groove network. the

(5) At each speed, the tractive force values of the test hull A and test hull B were alternately measured three times, and finally the average value was taken as the traveling resistance value of the hull at this speed. The results are shown in Figure 17. the

The test data shows that the overall resistance of the smooth surface hull in the test speed range is greater than the traveling resistance of the groove network ship plate. It can be seen that the bionic surface drag reduction structure of the utility model can significantly reduce the resistance of the hull when traveling at low speed in the paddy field. the

Claims (8)

1. a paddy field boat type machine bionic surface drag reduction structure, is characterized in that: be the abdominal skin lines of bionic amphibious class reptile, be distributed with the groove network of mutual UNICOM on the hull outer surface contacting with paddy field mud face.

2. paddy field according to claim 1 boat type machine bionic surface drag reduction structure, is characterized in that: in described groove network, the slot opening of groove is 1～40mm, and the degree of depth is 5～50mm.

3. paddy field according to claim 1 boat type machine bionic surface drag reduction structure, is characterized in that: in described groove network, the shape of cross section of groove is rectangle, trapezoidal, inverted trapezoidal, triangle, arc, monolateral trapezoidal or monolateral triangle.

4. paddy field according to claim 1 boat type machine bionic surface drag reduction structure, is characterized in that: in described groove network, single grid be shaped as staggered rectangle, parallelogram or imitative moire hexagon.

5. paddy field according to claim 1 boat type machine bionic surface drag reduction structure, is characterized in that: in described groove network, the shape area of single grid is 1～1000cm ².

6. paddy field according to claim 1 boat type machine bionic surface drag reduction structure, is characterized in that: be provided with and initiatively supplement groove water system.

7. paddy field according to claim 6 boat type machine bionic surface drag reduction structure, it is characterized in that: the described groove water system that initiatively supplements,, at the hull front end of paddy field boat type machine, one or more water jets are installed, mechanically be provided with water tank and pressure apparatus in paddy field boat form, water tank and pressure apparatus pass through inner passage force feed to water jet by Water in Water Tank, when hull advances, can supplement groove water.

8. according to the paddy field boat type machine bionic surface drag reduction structure described in claim 6 or 7, it is characterized in that: the described groove water system that initiatively supplements is that water jet is installed in groove; The lower end of water jet and groove UNICOM, upper end is connected with high-pressure water pipe is airtight; The airtight connection water tank of the other end and the pressure apparatus of high-pressure water pipe.