An adjustable proportional pesticide mixer based on a negative stiffness metamaterial structure

Abstract

The present invention discloses an adjustable proportion pesticide mixer based on a negative stiffness metamaterial structure, which includes a first liquid medicine injection pipe and a second liquid medicine injection pipe. The bottom end of the first liquid medicine injection pipe is connected with a first horizontal liquid guiding pipe, and the bottom end of the second liquid medicine injection pipe is connected with a second horizontal liquid guiding pipe. The first horizontal liquid guiding pipe and the second horizontal liquid guiding pipe are arranged oppositely and are connected by a negative stiffness metamaterial structure exchanger; a first rubber plug is slidably connected in the first horizontal liquid guiding pipe, and a second rubber plug is slidably connected in the second horizontal liquid guiding pipe. The first rubber plug and the second rubber plug are respectively connected to both ends of the negative stiffness metamaterial structure exchanger; the bottom end of the middle part of the first horizontal liquid guiding pipe is communicated with a first liquid dividing pipe, and the bottom end of the middle part of the second horizontal liquid guiding pipe is communicated with a second liquid dividing pipe. Both the first liquid dividing pipe and the second liquid dividing pipe are communicated with a mixing housing.

Description

Technical Field

[0001] The present invention relates to the field of pesticide equipment, and particularly to an adjustable proportion pesticide mixer based on a negative stiffness metamaterial structure. Background Art

[0002] Currently, the widely used pesticide mixing technology in the market is mostly the way of manual pouring and mixing by farmers. A small number of growers will use machine stirring and mixing. Since pesticides are harmful to the body, it is inevitable to come into contact with pesticides when mixing pesticides in the fields, which causes damage to the farmers' bodies. At the same time, most of the existing pesticide mixing devices in the market need to be driven by electricity. For example, a liquid pesticide mixer disclosed in the patent number CN201621154256.9 needs to be connected to an electric wire, which is not easy to use in the fields and causes trouble for farmers. Moreover, this device is usually heavy and occupies a large space, and cannot be used portably, which causes trouble for farmers to use in different plots. Therefore, it is necessary to improve it. Summary of the Invention

[0003] The purpose of the present invention is to provide an adjustable proportion pesticide mixer based on a negative stiffness metamaterial structure with a simple structure and convenient use for the above problems.

[0004] In order to achieve the above purpose, the technical solution of the present invention is as follows:

[0005] An adjustable proportion pesticide mixer based on a negative stiffness metamaterial structure includes a first liquid medicine injection pipe and a second liquid medicine injection pipe. The first liquid medicine injection pipe and the second liquid medicine injection pipe are respectively communicated with a mixing housing. The bottom end of the first liquid medicine injection pipe is connected with a first horizontal liquid guide pipe, and the bottom end of the second liquid medicine injection pipe is connected with a second horizontal liquid guide pipe. The first horizontal liquid guide pipe and the second horizontal liquid guide pipe are arranged opposite to each other and are connected by a negative stiffness metamaterial structure exchanger. A first rubber plug is slidably connected in the first horizontal liquid guide pipe, and a second rubber plug is slidably connected in the second horizontal liquid guide pipe. The first rubber plug and the second rubber plug are respectively connected to both ends of the negative stiffness metamaterial structure exchanger. The bottom end of the middle part of the first horizontal liquid guide pipe is communicated with a first liquid distribution pipe, and the bottom end of the middle part of the second horizontal liquid guide pipe is communicated with a second liquid distribution pipe. Both the first liquid distribution pipe and the second liquid distribution pipe are communicated with the mixing housing.

[0006] Further, the negative stiffness metamaterial structure exchanger includes a plurality of cosine-shaped buckling beams, a first connecting rod, and a second connecting rod. The length directions of the first connecting rod and the second connecting rod are consistent with the axis direction of the first rubber plug. One end of the first connecting rod is connected to the first rubber plug, and the other end of the first connecting rod is fixedly connected to one side of the center position of the cosine-shaped buckling beam. One end of the second connecting rod is connected to the second rubber plug, and the other end of the second connecting rod is fixedly connected to the other side of the center position of the cosine-shaped buckling beam. The plurality of cosine-shaped buckling beams are arranged at equal intervals along the circumferential direction of the first connecting rod. Fixed rods are fixedly connected to both ends of the cosine-shaped buckling beam. The length direction of the fixed rod is consistent with the length direction of the first connecting rod. Both ends of the fixed rod are respectively fixedly connected to the first horizontal liquid guide pipe and the second horizontal liquid guide pipe.

[0007] Further, the cosine-shaped buckling beam is made of one or a mixture of beryllium copper alloy, rubber, polyester elastomer, propylene-based elastomer, and vinyl elastomer.

[0008] Further, among the plurality of cosine-shaped buckling beams, the included angle between adjacent cosine-shaped buckling beams is 45 degrees. The overall curve of the cosine-shaped buckling beam is a cosine function. The two end points of the cosine-shaped buckling beam are located on the X-axis, and the center point of the cosine-shaped buckling beam is located on the y-axis.

[0009] Further, a folding telescopic pipe is arranged between the first liquid medicine injection pipe and the first horizontal liquid guide pipe. The axes of the folding telescopic pipe and the second liquid medicine injection pipe are both vertically arranged.

[0010] Further, the bottoms of the first liquid distribution pipe and the second liquid distribution pipe are connected with a three-way joint and are connected to the top end of the diversion pipe through the three-way joint. The bottom end of the diversion pipe is connected to one side of the top end of the mixing shell. The other side of the bottom end of the mixing shell is communicated with a discharge pipe. A stirring mechanism is arranged in the mixing shell.

[0011] Further, the stirring mechanism includes a rotating shaft. The rotating shaft is arranged in the mixing shell. The axis of the rotating shaft is parallel to the ground and is at the center position of the mixing shell and is perpendicular to the vertical line of the center of the mixing shell. A tangential flow impeller is rotatably connected to the outside of the rotating shaft. A plurality of blades are arranged on the tangential flow impeller. One side of the blades of the tangential flow impeller is located below the diversion pipe. The blades are curved. The included angle between adjacent blades is 60 degrees.

[0012] Compared with the prior art, the advantages and positive effects of the present invention are:

[0013] Through the design of the negative stiffness metamaterial structure exchanger, the present invention can proportionally achieve the mixing operation of two pesticides without manual operation, effectively protecting the health of the operator. At the same time, it drives the tangential flow propeller impeller in the stirring mechanism to perform the liquid medicine mixing and stirring operation through the flow of the liquid medicine, without the need for a power drive device, achieving the effects of saving funds, saving energy, and being low-carbon and environmentally friendly. Moreover, it reduces the weight of the entire device, decreases the occupied space, and also avoids the sudden situation where the machine cannot continue to work due to power failure, effectively improving the use effect of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0015] Figure 1 is a schematic structural diagram of the present invention;

[0016] Figure 2 is a schematic structural diagram of the negative stiffness metamaterial structure exchanger;

[0017] Figure 3 is a sectional structural diagram of the negative stiffness metamaterial structure exchanger;

[0018] Figure 4 is a schematic structural diagram of a single cosine-shaped buckling beam Figure 1 ;

[0019] Figure 5 is a schematic structural diagram of a single cosine-shaped buckling beam Figure 2 ;

[0020] Figure 6 is a schematic structural diagram of the tangential flow propeller impeller;

[0021] Figure 7 is a sectional structural diagram of the tangential flow propeller impeller. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts, any modifications, equivalent replacements, improvements, etc., shall be included in the protection scope of the present invention.

[0023] Such asFigures 1 to 7 As shown in the figure, this embodiment discloses an adjustable proportional pesticide mixer based on a negative stiffness metamaterial structure, including a negative stiffness metamaterial structure exchanger 1, a folding telescopic pipe 2, and a tangential flow propeller impeller. The negative stiffness metamaterial structure exchanger 1 is fixed on the first horizontal liquid guide pipe 5 and the second horizontal liquid guide pipe 6 through a fixed rod 16. The left end of the negative stiffness metamaterial structure exchanger 1 is connected to a first rubber plug 17 through a first connecting rod 19. The first rubber plug 17 is placed inside the first horizontal liquid guide pipe 5. The left side of the first horizontal liquid guide pipe 5 is connected to the folding telescopic pipe 2. The lower part of the first horizontal liquid guide pipe 5 is connected to a first liquid distribution pipe 9 with a certain caliber. The other end of the folding telescopic pipe 2 is connected to a first liquid medicine injection pipe 4;

[0024] The right end of the negative stiffness metamaterial structure exchanger 1 is connected to a second rubber plug 18 through a second connecting rod 20. The second rubber plug 18 is placed inside the second horizontal liquid guide pipe 6. The other end of the second horizontal liquid guide pipe 6 is connected to a second liquid medicine injection pipe 7. The lower part of the second horizontal liquid guide pipe 6 is connected to a second liquid distribution pipe 10 with a certain caliber. The first liquid distribution pipe 9 is connected to the second liquid distribution pipe 10 through a three-way joint 11. The lower part of the three-way joint 11 leads to a mixing housing 3 through a guide pipe 12. At the center position of the mixing housing 3, a tangential flow propeller impeller with an axis parallel to the ground and perpendicular to the plumb line of the center of the mixing housing is connected through a rotating shaft 13. A week of propeller-shaped blades 14 are installed on the tangential flow propeller impeller in a periodic arrangement with a 60-degree interval between each blade 14. The lower part of the mixing housing 3 is connected to a discharge pipe 8.

[0025] The negative stiffness metamaterial structure exchanger 1 includes a number of vertically arranged cosine-shaped buckling beams 15. The upper and lower ends of the cosine-shaped buckling beams 15 are fixed on the first horizontal liquid guide pipe 5 and the second horizontal liquid guide pipe 6 by two fixed rods 16. The cosine-shaped buckling beams 15 are arranged in a periodic manner with the center as the origin in the vertical plane, covering a full circle in an arrangement where each cosine-shaped buckling beam 15 is separated by 45 degrees. And at the left side position of the vertex of the cosine-shaped buckling beam 15, it is connected to the first rubber plug 17 through a first connecting rod 19 with a certain length, and at the right side position of the vertex of the cosine-shaped buckling beam 15, it is connected to the second rubber plug 18 through a second connecting rod 20 with a certain length;

[0026] The cosine-shaped buckling beam 15 is made of elastic materials such as beryllium copper alloy, rubber, polyester elastomer, propylene-based elastomer, vinyl elastomer, etc. as the base materials. The cosine-shaped buckling beam 15 can realize repeated jumping between the first steady state and the second steady state without fatigue failure, showing excellent fatigue resistance; the overall curve of the cosine-shaped buckling beam is a cosine function. The left and right end points of the cosine-shaped buckling beam are located on the X-axis, and the vertex of the cosine-shaped buckling beam is located on the Y-axis; the cosine-shaped buckling beam can adopt a single-layer structure such as Figure 4As shown, a double-layer overlapping structure can also be adopted, such as Figure 5 shown.

[0027] The first rubber stopper 17 is threadedly connected to the first connecting rod 19, and the first rubber stopper can be replaced according to the required proportion of pesticides to be prepared. There is a clearance fit between the first rubber stopper 17 and the first horizontal liquid guide pipe 5, which can prevent the deviation of the liquid medicine mixing ratio from the calculated value caused by the friction between the rubber stopper and the inner wall of the horizontal liquid guide pipe.

[0028] The folding telescopic pipe 2 is stacked by disc-shaped single-tube cells. The disc-shaped single-tube cell structure can achieve the zero Poisson's ratio effect during axial stretching or compression, meet the numerical requirements during the calculation of the liquid medicine mixing ratio, and the upper end of the folding telescopic pipe is connected to the first liquid medicine injection pipe, and the lower end is connected to the first horizontal liquid guide pipe.

[0029] The axis of the rotating shaft 13 of the tangential flow propeller impeller is parallel to the ground and is located at the center of the mixing housing 3 and is perpendicular to the vertical line passing through the center of the mixing housing 3. The vertical line passing through the center of the mixing housing 3 and the left pipe wall of the guide pipe 12 are in the same vertical plane.

[0030] The blades 14 of the tangential flow propeller impeller are propeller-shaped backward-curved blades, which are installed in a periodic arrangement with a 60-degree interval between each blade. The propeller-shaped backward-curved blades have a long blade path, a small blade curvature, and a large cross-sectional area, which are more conducive to the mixing of liquid medicine. The profile of the propeller-shaped backward-curved blades adopts a parabolic shape, which can greatly reduce the wear of the blades by the particles in the liquid medicine and prevent blockage. The liquid medicine vertically falls along the guide pipe and enters the mixing housing and lands on the propeller-shaped backward-curved blades and moves tangentially relative to the tangential flow propeller impeller. The propeller-shaped backward-curved blades rotate around the rotating shaft due to the gravitational potential energy from the liquid medicine, completing the liquid medicine mixing work. This process is all driven by the flow power of the liquid medicine and does not require external power drive.

[0031] The basic principle of the present invention is as follows: Based on the pressure difference after the injection of liquid medicine at both left and right ends acting on the rubber stoppers at both left and right ends, the cosine-shaped buckling beam is forced to jump from the first steady state to the second steady state, causing the first rubber stopper to move to the right and exposing the first liquid separation tube to reduce the liquid pressure on the left side until the pressure difference between the liquid pressure on the right side and the left side is higher than the maximum value of the critical load of the cosine-shaped buckling beam, causing the cosine-shaped buckling beam to jump from the second steady state to the first steady state again, and the second rubber stopper moves to the left and exposes the second liquid separation tube, realizing the proportional mixing of the liquid medicines on both sides. Since the mother material used for the cosine-shaped buckling beam is an elastic material, when the cosine-shaped buckling beam is subjected to a load, as the load increases, the deformation of the cosine-shaped buckling beam also increases until the load exceeds the maximum value of the critical load of the cosine-shaped buckling beam, and the cosine-shaped buckling beam becomes unstable and jumps from the first steady state to the second steady state, completing the conversion of liquid medicine input. Moreover, the cosine-shaped buckling beam can repeatedly jump between the first steady state and the second steady state according to the load difference between the left and right sides without fatigue failure, improving the service life of the equipment;

[0032] Assume that it is necessary to prepare a uniform mixture of two liquid medicines in equal proportions. Assume that the concentrations of the liquid medicines added at both left and right ends are ρ1 and ρ2, the height of the folding and telescopic tube is H1, the height of the second liquid medicine injection tube is H2, the diameters of the first rubber stopper and the second rubber stopper are S1 and S2, and the maximum load critical value of the cosine-shaped buckling beam is F. The magnitudes of the masses of the liquid medicines flowing out at both left and right ends, ΔM1 and ΔM2, can be calculated as follows: Since the two liquid medicines need to be mixed in equal proportions,

[0033] that is, p1 = P2;

[0034] ρ1gh1 = ρ2gh2;

[0035]

[0036] When ;

[0037]

[0038] Similarly, it can be obtained that

[0039]

[0040] Since S1 = S2, so ΔM1 = ΔM2, thus meeting the requirement of expected equal-proportion uniform mixing;

[0041] When two liquid medicines need to be prepared in different proportions, the mixing ratio of liquid medicine 1 and liquid medicine 2 is the ratio relationship between ΔM1 and ΔM2. From the above formula, it can be seen that ΔM1:ΔM2 = S1:S2. Therefore, for liquid medicines that need to be adjusted to different mixing proportions, only the diameters of the left and right rubber stoppers and the horizontal liquid guide tube need to be adjusted and replaced according to the required proportion.

[0042] The present invention has the following beneficial effects:

[0043] 1. The negative stiffness metamaterial structure exchanger in the present invention can repeatedly jump between the first steady state and the second steady state under the action of the hydraulic pressure difference of the liquid medicine, so that the liquid medicine is evenly mixed in a set ratio, achieving the purpose of liberating hands and improving productivity, and reducing the contact between the user and the pesticide, effectively protecting the physical health of the user;

[0044] 2. The negative stiffness metamaterial structure exchanger adopts a new force drive mode of liquid pressure difference, replacing the traditional electric drive, eliminating the sudden situation that the appliance cannot continue to work due to power failure, saving energy, protecting the environment, achieving low-carbon, high-efficiency and stable operation;

[0045] 3. The present invention uses a negative stiffness metamaterial structure to replace the traditional motor system, which not only reduces the overall mass, saves the cost of the appliance, but also reduces the occupied space of the appliance, enables the user to flexibly disassemble and assemble in the field, reduces the operation difficulty and burden of the user, and improves the operation efficiency;

[0046] 4. The negative stiffness metamaterial structure exchanger in the present invention is convenient to adjust and has a wide range of applications. The first rubber plug can be adjusted according to the concentration of the original liquid medicine and the required blending concentration, so as to meet the requirements of the liquid medicine for mixing;

[0047] 5. The cosine-shaped buckling beam in the present invention is made of elastic materials such as beryllium copper alloy, rubber, polyester elastomer, propylene-based elastomer, vinyl elastomer as the base materials, and can repeatedly jump without fatigue failure, showing excellent fatigue resistance, greatly improving the service life of the overall structure, with strong reliability and durability;

[0048] 6. The overall structure of the present invention has no strict airtightness requirements and has a wide adaptability, and can work normally under harsh and complex working conditions; at the same time, it is in a closed state throughout the mixing process, effectively preventing the splashing of the liquid medicine; the whole device has a clear structure, is easy to maintain, and operates safely.

Claims

1. An adjustable proportional pesticide mixer based on a negative stiffness metamaterial structure, comprising a first liquid medicine injection pipe and a second liquid medicine injection pipe. The first liquid medicine injection pipe and the second liquid medicine injection pipe are respectively communicated with a mixing housing, and it is characterized in that: The bottom end of the first liquid medicine injection tube is connected with a first horizontal liquid guide tube, and the bottom end of the second liquid medicine injection tube is connected with a second horizontal liquid guide tube. The first horizontal liquid guide tube and the second horizontal liquid guide tube are arranged oppositely and are connected by a negative stiffness metamaterial structure exchanger; a first rubber plug is slidably connected in the first horizontal liquid guide tube, and a second rubber plug is slidably connected in the second horizontal liquid guide tube. The first rubber plug and the second rubber plug are respectively connected to both ends of the negative stiffness metamaterial structure exchanger; a first liquid distribution tube is communicated with the bottom end of the middle part of the first horizontal liquid guide tube, and a second liquid distribution tube is communicated with the bottom end of the middle part of the second horizontal liquid guide tube. Both the first liquid distribution tube and the second liquid distribution tube are communicated with the mixing housing; The negative stiffness metamaterial structure exchanger includes a plurality of cosine-shaped buckling beams, a first connecting rod, and a second connecting rod. The length directions of the first connecting rod and the second connecting rod are consistent with the axis direction of the first rubber plug. One end of the first connecting rod is connected to the first rubber plug, and the other end of the first connecting rod is fixedly connected to one side of the central position of the cosine-shaped buckling beam. One end of the second connecting rod is connected to the second rubber plug, and the other end of the second connecting rod is fixedly connected to the other side of the central position of the cosine-shaped buckling beam; a plurality of cosine-shaped buckling beams are arranged at equal intervals along the circumferential direction of the first connecting rod; both ends of the cosine-shaped buckling beam are fixedly connected with fixing rods. The length direction of the fixing rods is consistent with the length direction of the first connecting rod, and both ends of the fixing rods are respectively fixedly connected to the first horizontal liquid guide tube and the second horizontal liquid guide tube; Based on the pressure difference acting on the rubber plugs at both ends after the liquid medicine is injected at both ends, the cosine-shaped buckling beam jumps from the first steady state to the second steady state under the action of force, causing the first rubber plug to move to the right and expose the first liquid distribution tube to reduce the liquid pressure on the left side until the pressure difference between the right side liquid pressure and the left side pressure is higher than the maximum value of the critical load of the cosine-shaped buckling beam, causing the cosine-shaped buckling beam to jump from the second steady state to the first steady state again, and the second rubber plug moves to the left to expose the second liquid distribution tube, realizing the proportional mixing of the liquid medicine on both sides.

2. The adjustable proportional pesticide mixer based on the negative stiffness metamaterial structure according to claim 1, characterized in that: The cosine-shaped buckling beam is made of one or a mixture of beryllium copper alloy, rubber, polyester elastomer, propylene-based elastomer, and vinyl elastomer.

3. The adjustable proportional pesticide mixer based on the negative stiffness metamaterial structure according to claim 2, wherein: Among the plurality of cosine-shaped buckling beams, the included angle between adjacent cosine-shaped buckling beams is 45 degrees; the overall curve of the cosine-shaped buckling beam is a cosine function. The two end points of the cosine-shaped buckling beam are located on the X-axis, and the center point of the cosine-shaped buckling beam is located on the y-axis.

4. The adjustable proportional pesticide mixer based on the negative stiffness metamaterial structure according to claim 1, wherein: A folding telescopic tube is arranged between the first liquid medicine injection tube and the first horizontal liquid guide tube, and the axes of the folding telescopic tube and the second liquid medicine injection tube are both vertically arranged.

5. The adjustable proportional pesticide mixer based on the negative stiffness metamaterial structure according to claim 1, characterized in that: The bottom ends of the first liquid distribution tube and the second liquid distribution tube are connected with a three-way joint and are communicated with the top end of the diversion tube through the three-way joint. The bottom end of the diversion tube is communicated with one side of the top end of the mixing housing, and the other side of the bottom end of the mixing housing is communicated with a discharge tube; a stirring mechanism is arranged in the mixing housing.

6. The adjustable proportional pesticide mixer based on the negative stiffness metamaterial structure according to claim 5, wherein: The stirring mechanism includes a rotating shaft, which is arranged inside the mixing housing. The axis of the rotating shaft is parallel to the ground and perpendicular to the plumb line of the center of the mixing housing. A tangential flow propeller impeller is rotatably connected to the outside of the rotating shaft. A number of blades are arranged on the tangential flow propeller impeller. One side of the blades of the tangential flow propeller impeller is located below the draft tube. The blades are arranged in a curved shape, and the included angle between adjacent blades is 60 degrees.

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