Method and device for detecting adhesive force of root fog drops

Abstract

The invention provides a root system fog drop adhesive force detection method and device, and the method comprises the following steps: S1, flatly laying a plant root system on a film laid on a panel, placing a second rod on the plant root system, connecting one end of a first rod with the second rod, connecting the other end of the first rod with a supporting rod, connecting one end of a hydraulic cylinder with the panel, and connecting the other end of the hydraulic cylinder with the panel; the other end of the hydraulic cylinder is connected with the first rod; and S2, the control device controls the expansion and contraction amount of the hydraulic cylinder to enable the first rod to lift the second rod upwards, the first rod is bent in the process until the second rod is separated from the plant root system, and the image acquisition device continuously takes photos in the process. The bending condition of the first rod when the second rod is separated from the root system is shot through the image acquisition device, the fog drop adhesive force of the target plant root system is obtained through calculation, the operation is simple, the structure is simple, the manufacturing cost is low, the measurement is accurate, the error range is reduced, the efficiency is high, and the fog drop adhesive force value of the target root system can be rapidly obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of agricultural engineering atomization cultivation, and in particular relates to a method and a device for detecting the adhesion of root droplets. Background Art

[0002] In the field of atomization cultivation, the nozzle needs to spray the roots at a certain frequency. The adhesion of the droplets to the roots often determines the growth of the plant. Low adhesion will cause the loss of droplets, loss of water and nutrients, and thus affect the growth of the plant. Therefore, increasing the adhesion of droplets to the roots of plants is the key to plant growth. Adhesion refers to the adsorption capacity of a substance, and adhesion measurement measures the affinity between the surface of an object and a solid or liquid.

[0003] In the existing root adhesion measurement devices and measurement methods, the measurement method is mostly to continuously push and pull the sample through the instrument, record the friction and drag force in the process, and then calculate the adhesion between the sample and the solid. The measurement combination instrument is complex and the process is cumbersome, the measurement error range is large, and the cost is high, which is not conducive to the efficient and accurate measurement of the target root adhesion. Therefore, it restricts the development of root adhesion measurement to a certain extent. Summary of the invention

[0004] The present invention aims to solve at least one of the above technical problems to a certain extent. To this end, the present invention proposes a method and device for detecting the adhesion force of fog droplets on the root system, wherein the bending of the first rod when the second rod is separated from the root system is photographed by an image acquisition device, and the fog drop adhesion force of the target plant root system is calculated. The present invention is simple to operate, simple in structure, accurate in measurement, reduces the error range, and is highly efficient, and can quickly obtain the fog drop adhesion force value of the target root system.

[0005] The technical solution of the present invention is: a method for detecting root droplet adhesion, comprising the following steps:

[0006] S1: Lay the plant roots flat on the film laid on the panel, place the second rod on the plant roots, connect one end of the first rod to the second rod, connect the other end of the first rod to the support rod, connect one end of the hydraulic cylinder to the panel, and connect the other end of the hydraulic cylinder to the first rod;

[0007] S2: The control device controls the extension and contraction of the hydraulic cylinder so that the first rod lifts the second rod upwards. During the process, the first rod bends until the second rod is separated from the plant root system and stops. The image acquisition device continuously takes photos during this process.

[0008] S3: Filter out the photos of the second rod being separated from the plant root system and measure the arc angle of the first rod after bending in the photos;

[0009] S4: The arc angle is transmitted to the control device, and the control device calculates the droplet adhesion force of the plant root system.

[0010] In the above scheme, the step of calculating the droplet adhesion force of the plant root system in S4 comprises the following steps:

[0011] S4.1: The radius of curvature ρ of the arc is obtained by the arc length formula ρθ=L, where L is the length of the first rod and θ is the arc angle;

[0012] S4.2: Take a small section of the first rod, set the rotation angle of the central axis of the section to be dθ, set the length L of the section before bending deformation to be dx, dx = ρdθ, and set the radius of the cross section of the first rod to be n;

[0013] Assume that the length of the segment after deformation is d 1 x,d 1 x=(n+ρ)dθ;

[0014] According to the definition of strain, the change value ε of the first rod is: Where ΔL is the length difference before and after the deformation of the segment;

[0015] S4.4: According to Hooke’s law, the stress σ in the first bar section with radius n is Where, E is the elastic modulus of the first rod;

[0016] S4.5: The moment of inertia I of the first rod section is d is the diameter of the first rod section;

[0017] According to the bending moment and stress formula The bending moment M of the first rod is obtained as

[0018] S4.6: Based on the force and bending moment M=F*L, calculate the magnitude of the force F on the first rod when it is bent, and then subtract the gravity G of the second rod 2 to obtain the surface adhesion force f of the wet roots, f=FG.

[0019] A device for detecting root droplet adhesion force comprises a first rod, a second rod, a film, a panel, an image acquisition device, a hydraulic cylinder and a control device;

[0020] The film is placed on the panel, the plant roots are spread flat on the film, the second rod is placed on the plant roots, the middle part of the second rod is raised or has a hole in the middle, a support rod is provided on the panel, the first rod is made of a flexible and bendable material, one end of the first rod passes through the middle part of the second rod or the middle hole, the other end of the first rod is connected to the support rod, so that the first rod is parallel to the panel, one end of the hydraulic cylinder is connected to the panel, the other end of the hydraulic cylinder is connected to the other end of the first rod, the image acquisition device is used to capture a front view of the second rod, and the control device is respectively connected to the hydraulic cylinder and the image acquisition device.

[0021] In the above solution, the first rod is a copper wire.

[0022] In the above solution, the second rod is an iron wire or an aluminum wire.

[0023] In the above solution, the film is a plastic film.

[0024] In the above scheme, the control device controls the extension and contraction amount of the hydraulic cylinder so that the first rod generates an upward force, and the first rod lifts the second rod upward until the second rod is separated from the plant root system and stops. The image acquisition device continuously takes photos during this process, selects photos when the second rod is separated from the plant root system and measures the arc angle of the first rod after bending in the photo, and transmits the arc angle to the control device, which calculates the droplet adhesion force of the plant root system.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention uses an image acquisition device to capture the bending of the first rod when the second rod is separated from the root system, and calculates the droplet adhesion force of the target plant root system. The present invention is simple to operate, simple in structure, low in manufacturing cost, accurate in measurement, reduces the error range, and has high efficiency, and can quickly obtain the droplet adhesion force value of the target root system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of a root droplet adhesion detection device according to one embodiment of the present invention.

[0028] Figure 2 It is a schematic diagram of a root droplet adhesion detection device according to one embodiment of the present invention.

[0029] Figure 3 It is a schematic diagram of the first rod coordinates of a root droplet adhesion detection device according to an embodiment of the present invention.

[0030] Figure 4 It is a schematic diagram of the bending angle of the first rod of a root droplet adhesion detection device according to one embodiment of the present invention.

[0031] Figure 5 It is a schematic diagram of the bending deformation of the first rod of a root droplet adhesion detection device according to one embodiment of the present invention.

[0032] Figure 6 It is a partially enlarged view of the bending of the first rod of a root droplet adhesion detection device according to one embodiment of the present invention.

[0033] In the figure: 1-first rod; 2-second rod; 3-plant root system; 4-panel; 5-film; 6-hydraulic cylinder; 7-image acquisition device; 8-support rod. DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "front", "back", "left", "right", "up", "down", "axial", "radial", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0036] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] Figure 1 The figure shows a preferred embodiment of the device for realizing the root system droplet adhesion detection method, a root system droplet adhesion detection device, comprising a first rod 1, a second rod 2, a film 5, a panel 4, an image acquisition device 7, a hydraulic cylinder 6 and a control device;

[0038] The film 5 is placed on the panel 4, the plant roots are laid flat on the film 5, the second rod 2 is placed on the plant roots, the middle part of the second rod 2 is raised or provided with a hole in the middle, a support rod 8 is provided at the vertical line of the middle part of the second rod 2 or the middle hole on the panel 4, one end of the first rod 1 passes through the middle part of the second rod 2 The raised or the middle hole in the middle, the other end of the first rod 1 is connected to the support rod 8, so that the first rod 1 is parallel to the panel 4, one end of the hydraulic cylinder 6 is connected to the panel 4, and the other end of the hydraulic cylinder 6 is connected to the first rod 1, the image acquisition device 7 is installed on the panel 4, the image acquisition device 7 is parallel to the second rod 2 and is located in the same horizontal plane, so that the image acquisition device 7 can capture the front view of the second rod 2, and the control device is respectively connected to the hydraulic cylinder 6 and the image acquisition device 7.

[0039] Preferably, the first rod 1 is made of a flexible and bendable material, and the material of the first rod 1 is required to have good ductility.

[0040] According to an embodiment of the present invention, preferably, the first rod 1 is a copper wire.

[0041] Preferably, the second rod 2 is made of a rigid material, and the material of the second rod 2 is required to be light, easy to bend and low in cost;

[0042] According to an embodiment of the present invention, preferably, the second rod 2 is an iron wire, the second rod 2 is arched, and the bottom of the second rod 2 is attached to the plant root system.

[0043] According to an embodiment of the present invention, preferably, the film 5 is a plastic film having strong adhesion to plant roots.

[0044] Preferably, the image acquisition device 7 is a camera.

[0045] Preferably, the control device controls the extension and contraction amount of the hydraulic cylinder 6 so that the first rod 1 generates an upward force, and the first rod 1 lifts the second rod 2 upward until the second rod 2 is separated from the plant root system and stops. The image acquisition device 7 continuously takes photos during this process, manually selects photos when the second rod 2 is separated from the plant root system and measures the arc angle of the first rod 1 after bending in the photo, and transmits the arc angle to the control device, which calculates the droplet adhesion force of the plant root system.

[0046] A method for realizing the above-mentioned root droplet adhesion detection device comprises the following steps:

[0047] S1: The plant roots are laid flat on the film 5 laid on the panel 4, the second rod 2 is placed on the plant roots, one end of the first rod 1 is connected to the second rod 2, the other end of the first rod 1 is connected to the support rod 8, one end of the hydraulic cylinder 6 is connected to the panel 4, and the other end of the hydraulic cylinder 6 is connected to the first rod 1;

[0048] S2: The control device controls the extension and contraction amount of the hydraulic cylinder 6 so that the first rod 1 lifts the second rod 2 upwards. During the process, the first rod 1 bends until the second rod 2 is separated from the plant root system and stops. The image acquisition device 7 continuously takes photos during this process.

[0049] S3: Filter out the photos of the second rod 2 being separated from the plant root system and measure the arc angle of the first rod 1 after bending in the photos;

[0050] S4: The arc angle is transmitted to the control device, and the control device calculates the droplet adhesion force of the plant root system.

[0051] Calculation process of droplet adhesion:

[0052] The first rod 1 after bending is in an arc shape, and the perpendicular lines of the tangents at both ends of the arc intersect to obtain the center of the circle, and the arc angle θ is measured;

[0053] S4.1: The curvature radius ρ of the arc is obtained by the arc length formula ρθ=L, where L is the length of the first rod 1 and θ is the arc angle;

[0054] like Figure 3 , regard the bending of the first rod 1 as pure bending, which is only subjected to positive stress, analyze the deformation geometric relationship, set the coordinate system of the first rod 1, take the axial direction of the first rod 1 as the x-axis, the center line of the front and rear axes as the y-axis, the center axis of the deformation as the z-axis, and take the right of the x-axis, the bottom of the y-axis, and the back of the z-axis as the positive directions.

[0055] like Figure 4 , 5 , 6, S4.2: Take a small section op of the first rod 1, set the rotation angle of the central axis ab of the section to be dθ, set the length L of the section before bending deformation to be dx, dx = ρdθ, set the cross-sectional radius of the first rod 1 to be n;

[0056] Assume that the length of o1p1 after deformation is d 1 x,d 1 x=(n+ρ)dθ;

[0057] like Figure 4 , 6 As shown, the length of the central axis a1b1 after deformation remains unchanged: ab=op=dx=a1b 1＝ ρdθ;

[0058] According to the strain definition, the change value ε of the first rod 1 is: Where ΔL is the length difference before and after the deformation of the segment;

[0059] S4.4: According to Hooke's law, the stress σ of the first bar 1 section with radius n is Wherein, E is the elastic modulus of the first rod 1;

[0060] S4.5: The moment of inertia I of the first rod 1 is d is the cross-sectional diameter of the first rod 1;

[0061] According to the bending moment and stress formula The bending moment M of the first rod 1 is obtained as

[0062] S4.6: Based on the force and bending moment M=F*L, calculate the magnitude of the force F on the first rod 1 when it is bent, and then subtract the gravity G of the second rod 2 to obtain the surface adhesion force f of the wet root system, f=FG.

[0063] Example 1

[0064] Lay the lettuce root system flat on the film 5, and place the second rod 2 on the lettuce root system;

[0065] The control device controls the extension and contraction amount of the hydraulic cylinder 6 so that the first rod 1 lifts the second rod 2 upward until the second rod 2 is separated from the plant root system and stops, and the image acquisition device 7 continuously takes pictures during this process;

[0066] The photos of the second rod 2 being separated from the lettuce root system were manually selected and the arc angle of the first rod 1 after bending in the photos was measured to be 24°;

[0067] The arc angle of 24° is transmitted to the control device, which calculates the droplet adhesion force on the plant roots:

[0068] Preset value in the control device: The first rod 1 is made of copper wire, and the elastic modulus of the copper wire is E = 2×10 11 Pa, the cross-sectional diameter of the first rod 1 is d = 0.34 mm, the length of the first rod 1 is L = 5 cm, the cross-sectional radius is n = 0.17 mm, and the weight of the second rod 2 is G = 0.000714028 N;

[0069] The arc length formula ρθ=L gives the radius of curvature of the arc.

[0070] According to the definition of strain, the change value of the first rod 1 is:

[0071] According to Hooke's law, the stress at the radius n of the first rod 1 section is

[0072] The moment of inertia of the first rod 1 is

[0073] First rod 1 bending moment

[0074] According to the force and bending moment M=F*L, the force F=0.021959307N exerted on the first rod 1 when it is bent, and the surface adhesion force of the lettuce root system f=FG=0.021245279N are calculated.

[0075] It should be understood that although this specification is described according to various embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0076] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. All equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for detecting root droplet adhesion, characterized in that: The following steps are involved: S1: The plant roots are laid flat on the film (5) laid on the panel (4), the second rod (2) is placed on the plant roots, one end of the first rod (1) is connected to the second rod (2), the other end of the first rod (1) is connected to the support rod (8), one end of the hydraulic cylinder (6) is connected to the panel (4), and the other end of the hydraulic cylinder (6) is connected to the first rod (1); S2: The control device controls the extension and contraction of the hydraulic cylinder (6) so that the first rod (1) lifts the second rod (2) upwards, and the first rod (1) bends during the process until the second rod (2) is separated from the plant root system and stops, and the image acquisition device (7) continuously takes photos during the process; S3: Filter out the photos of the second rod (2) being separated from the plant root system and measure the arc angle of the first rod (1) after bending in the photos; S4: The arc angle is transmitted to the control device, and the control device calculates the droplet adhesion force of the plant root system.

2. The root droplet adhesion detection method according to claim 1, characterized in that: The calculation of the droplet adhesion force of the plant root system in S4 comprises the following steps: S4.1: The radius of curvature ρ of the arc is obtained by the arc length formula ρθ=L, where L is the length of the first rod (1) and θ is the arc angle; S4.2: Take a small section of the first rod (1), set the rotation angle of the central axis of the section to be dθ, set the length L of the section before bending deformation to be dx, dx = ρdθ, and set the cross-sectional radius of the first rod (1) to be n; Assume that the length of the segment after deformation is d 1 x,d 1 x=(n+ρ)dθ; According to the definition of strain, the change value ε of the first rod (1) is: Where ΔL is the length difference before and after the deformation of the segment; S4.4: According to Hooke's law, the stress σ of the cross section of the first rod (1) with radius n is Wherein, E is the elastic modulus of the first rod (1); S4.5: The moment of inertia I of the first rod (1) is d is the cross-sectional diameter of the first rod (1); According to the bending moment and stress formula The bending moment M of the first rod (1) is obtained as S4.6: Based on the force and bending moment M=F*L, calculate the magnitude of the force F on the first rod (1) when it is bent, and then subtract the gravity G of the second rod 2 to obtain the surface adhesion force f of the wet root system, f=FG.

3. A device for implementing the root droplet adhesion detection method of claims 1 to 2, characterized in that: It comprises a first rod (1), a second rod (2), a film (5), a panel (4), an image acquisition device (7), a hydraulic cylinder (6) and a control device; The film (5) is placed on the panel (4), the plant roots are laid flat on the film (5), the second rod (2) is placed on the plant roots, the middle of the second rod (2) is raised or provided with a hole, a support rod (8) is provided on the panel (4), the first rod (1) is made of a flexible and bendable material, one end of the first rod (1) passes through the middle of the second rod (2) The raised part or the middle hole, the other end of the first rod (1) is connected to the support rod (8), so that the first rod (1) is parallel to the panel (4), one end of the hydraulic cylinder (6) is connected to the panel (4), and the other end of the hydraulic cylinder (6) is connected to the other end of the first rod (1), the image acquisition device (7) is used to acquire a front view of the second rod (2), and the control device is respectively connected to the hydraulic cylinder (6) and the image acquisition device (7).

4. The root droplet adhesion detection device according to claim 3, characterized in that: The first rod (1) is a copper wire.

5. The root droplet adhesion detection device according to claim 3, characterized in that: The second rod (2) is an iron wire or an aluminum wire.

6. The root droplet adhesion detection device according to claim 3, characterized in that: The film (5) is a plastic film.

7. The root droplet adhesion detection device according to claim 3, characterized in that: The control device controls the extension and contraction amount of the hydraulic cylinder (6) so that the first rod (1) generates an upward force, and the first rod (1) lifts the second rod (2) upward until the second rod (2) is separated from the plant root system and stops. The image acquisition device (7) continuously takes photos during this process, selects photos when the second rod (2) is separated from the plant root system, and measures the arc angle of the first rod (1) after bending in the photos, and transmits the arc angle to the control device, which calculates the droplet adhesion force of the plant root system.

Images