Granular pesticide on-line mixing mechanism and spraying device

Abstract

This invention provides an online mixing mechanism and spraying device for granular pesticides, including a premixer and an ejector. The ejector divides the water flow into a main stream and a tributary. The tributary enters the premixer to initially dissolve and mix the granular pesticides to obtain a premixed solution, which then returns to the ejector to merge with the main stream for secondary mixing. This method achieves granular disintegration and dispersion, as well as enhanced mixing, improving the online mixing effect and enabling efficient, precise, and green application of granular pesticides. It solves the current problem of precise utilization of granular pesticides, represented by WDGs, in the field of agricultural plant protection machinery.

Description

Technical Field

[0001] This invention belongs to the field of plant protection machinery technology, specifically relating to an online mixing mechanism for granular pesticides and a spraying device. Background Technology

[0002] Water-dispersible granules (WDGs) are widely used in pest and disease control for various crops due to their advantages such as stable storage, high utilization rate of active ingredients, and low volatility. Currently, the spraying of WDGs mainly employs a premixed spraying method, where the granules are manually mixed with water in a tank before being sprayed onto the target crop. This traditional method has several insurmountable drawbacks. To address the shortcomings of premixed spraying, online pesticide mixing technology has been gradually developed in recent years. This technology stores pesticides and water separately, allowing for real-time online mixing at the required concentration before direct spraying. This effectively reduces pesticide waste and environmental pollution, while also minimizing direct contact between sprayers and pesticides, thus improving operational safety. Existing online pesticide mixing methods include direct injection and jet mixing. Direct injection relies on a static mixing device to achieve uniform mixing of directly injected pesticides, with the pesticides being injected into the mixing device by an external pump. Jet mixing technology, on the other hand, has become a research hotspot in the field of online pesticide mixing technology due to its advantages such as simple structure, no moving parts, and convenient maintenance. Its core principle is to use a jet formed by high-speed fluid through a nozzle to draw in low-pressure pesticide solution by means of the Venturi effect, thereby achieving mixing of pesticide and water.

[0003] However, existing jet-type online mixing devices and technologies are mostly designed for liquid pesticides and are difficult to adapt to the online mixing requirements of granular pesticides, resulting in significant limitations in practical applications.

[0004] Firstly, granular pesticides have large particle sizes and poor flowability. Existing jet devices that rely solely on negative pressure suction have an unreasonable structural design that cannot be directly adopted. Otherwise, problems such as particle blockage of the suction channel and low suction efficiency may occur, preventing granular pesticides from quickly and stably entering the mixing area and affecting the uniformity of mixing. Some technologies use the dispersion effect caused by particle charging to promote particle suction based on jet suction, such as the invention patents "An Online Solid-Liquid Mixing Device for Impact Flow under the Action of Electrostatic Field" (Patent No.: ZL202010947527.0) and "An Online Solid-Liquid Mixing Device under the Action of Electrostatic Field" (Patent No.: ZL202010946729.3). However, in these related technologies, the charge on the particles is extremely easy to dissipate, and particle dispersion does not necessarily lead to smooth particle injection.

[0005] Secondly, the precise supply of granular pesticides has always been a challenge for many engineers. There is often an irreconcilable contradiction between the structural reliability of precision pesticide supply devices and the accuracy of pesticide supply. Even if granule injection can be achieved by relying on negative pressure suction in jet mixing devices, it is impossible to directly guarantee the accuracy of the pesticide supply.

[0006] Third, existing jet mixing devices lack effective particle disintegration, dispersion, and mixing enhancement structures. After the granular pesticides enter the mixing zone, they are difficult to fully contact, disintegrate, and disperse with water in a short time. After the mixed liquid flows out of the violent mixing zone, it is very easy for gravity sedimentation and agglomeration to occur during transportation, making it impossible to achieve precise proportioning and uniform mixing, thus affecting the spraying control effect.

[0007] Fourth, the existing online mixing spraying technology is not perfect for the application of granular pesticides. Some concentration control methods and variable spraying methods have high equipment requirements and are difficult to promote on a large scale, making it difficult to achieve truly precise pesticide application. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides an online mixing mechanism and spraying device for granular pesticides, thereby solving the problem of online mixing of granular pesticides.

[0009] The present invention achieves the above-mentioned technical objectives through the following technical means.

[0010] An online mixing mechanism for granular pesticides, comprising:

[0011] Premixer: It has a particle inlet at the top, a solvent outlet at the bottom, and nozzles on the side wall;

[0012] Ejector: It is equipped with an inlet pipe, a throat pipe, and an outlet pipe in sequence; the inlet pipe is equipped with a premixing port and is connected to the nozzle through a pipeline; the diameter of the throat pipe is smaller than that of the inlet pipe and the outlet pipe, and its top is connected to the solvent outlet through a solvent pipeline.

[0013] Furthermore, the inner wall of the water outlet pipe is provided with swirling vanes, which are divided into two groups with opposite swirling directions.

[0014] Furthermore, it also includes a storage tank located above the premixer, with a feed port at the bottom;

[0015] A buffer is provided between the storage tank and the premixer. The buffer has one or more buffer channels. The same buffer channel can be moved to be connected to the feed port or to be connected to the particle inlet.

[0016] Furthermore, the buffer is driven to rotate by the water flow within the throat to switch the docking position of the buffer channel.

[0017] Furthermore, a water turbine rotor is provided on the side of the throat, and the water turbine rotor part penetrates into the throat and is driven by the water flow, and drives the buffer to rotate through the drive shaft.

[0018] Furthermore, the storage tank is divided into two storage zones by a partition, and each storage zone is provided with a feeding port at the bottom;

[0019] The buffer, drive shaft, and water turbine rotor are provided in two sets, with the water turbine rotor symmetrically distributed on the left and right sides of the throat; the two buffers rotate synchronously through gear meshing.

[0020] Furthermore, the jet injector is equipped with a flow rate regulator, including a baffle plate and a throttling plate, which are connected by a swing arm; the throttling plate is placed in a slot opened on the throat and is equipped with a return spring; the baffle plate is located in the inlet pipe, and its structure is based on Bernoulli's principle. Under the action of water flow, it generates a swaying force on the swing arm, and when the flow rate exceeds a predetermined value, it overcomes the return spring and drives the throttling plate to sway and enter the throat.

[0021] Furthermore, the storage tank is equipped with a vibrator;

[0022] The feed inlet is elongated and has a feed baffle. The feed baffle has an outer contour consisting of an Archimedean spiral and a straight outer edge. It is connected to an adjustment knob on the outside of the storage tank via an adjustment rod. The opening of the feed inlet is adjusted by rotating the feed baffle.

[0023] Furthermore, there are two nozzles, which are positioned opposite each other; the premixing port is connected to a throttle valve, and then connected to the nozzles on both sides by a split pipe.

[0024] A spraying device includes the above-mentioned online mixing mechanism for granular pesticides, wherein an inlet pipe is connected to a water source and an outlet pipe is connected to an atomizing nozzle.

[0025] The beneficial effects of this invention are as follows:

[0026] (1) This invention provides an online mixing mechanism for granular pesticides, which works in concert with two components: a premixer and an ejector. The ejector divides the water flow into a main stream and a tributary. The tributary enters the premixer to initially dissolve and mix the granular pesticides to obtain a premixed liquid. Then, it returns to the ejector to merge with the main stream for secondary mixing. This method achieves particle disintegration and dispersion and enhanced mixing, thereby improving the online mixing effect. Based on the above mixing mechanism, a spraying device is also provided to achieve efficient, precise, and green application of granular pesticides, solving the problem of precise utilization of granular pesticides represented by WDGs in the current field of agricultural plant protection machinery.

[0027] (2) The present invention provides two sets of swirling vanes with different directions of rotation in the outlet pipe to enhance the turbulence in the outlet pipe, avoid sedimentation and agglomeration, and make the secondary mixing more thorough.

[0028] (3) The present invention sets up a buffer between the storage tank and the premixer. The buffer channel on the buffer continuously moves and switches between the interfaces of the storage tank and the premixer. In this way, the intermittent quantitative dispensing of granular pesticides is realized, and the vibrator is used to prevent granule blockage, thereby improving the accuracy and reliability of online mixing.

[0029] (4) The present invention directly uses the water flow in the jet as a power source to drive the buffer to operate without setting an additional power source. By setting the throat and its related structures, the flow velocity in the local area of ​​the jet is increased to ensure that the water turbine rotor has sufficient water flow driving force. The rotation speed of the buffer is positively correlated with the flow rate of the jet, and can adaptively adjust the supply rate of granular pesticides as the flow rate changes, so as to ensure the stability of the pesticide solution composition.

[0030] (5) The present invention uses a flow rate regulator to maintain or closely approximate a linear relationship between the turbine rotor speed and the total flow rate of the jet injector. When the flow rate is low, the turbine rotor speed and the flow rate are naturally linearly related. At this time, the throttling plate is locked in the slot by the return spring. When the flow rate is high, the turbine rotor speed no longer increases linearly with the flow rate. At this time, the flow rate regulator overcomes the return spring under the action of the water flow, causing the throttling plate to enter the throat, thereby further increasing the flow rate in the throat and promoting the increase of the turbine rotor speed, so that it reaches or closely approximates the speed required by the original linear growth. Attached Figure Description

[0031] Figure 1 This is a perspective view of the hybrid mechanism of the present invention;

[0032] Figure 2 This is a transparent internal structure schematic diagram of the hybrid mechanism of the present invention;

[0033] Figure 3 This is a cross-sectional view of the hybrid mechanism of the present invention;

[0034] Figure 4 This is a three-dimensional cross-sectional view of the mixing mechanism of the present invention;

[0035] Figure 5 for Figure 4 Corresponding 3D schematic diagram;

[0036] Figure 6 This is a three-dimensional cross-sectional view of the mixing mechanism of the present invention from another direction;

[0037] Figure 7 for Figure 6 Corresponding 3D schematic diagram;

[0038] Figure 8 This is an exploded view of the parts related to the granular pesticide feeding in the mixing mechanism of the present invention;

[0039] Figure 9 This is a schematic diagram of the feeding of granular pesticides in the mixing mechanism of the present invention;

[0040] Figure 10 This is a structural diagram of the flow rate regulator in this invention;

[0041] Figure 11 This is a schematic diagram illustrating the adjustment of the drug supply port opening size in this invention;

[0042] Figure 12 This is a system schematic diagram of the spray device of the present invention.

[0043] Figure label:

[0044] 1-Storage tank; 11-Storage cover; 12-Baffle; 13-Vibrator;

[0045] 14-Adjusting knob; 15-Preload spring; 16-Adjusting rod; 17-Feed baffle;

[0046] 18-Feed port; 2-Buffer chamber; 21-Buffer; 22-Buffer flow channel;

[0047] 23-Drive shaft; 24-Water turbine rotor; 25-Opening; 3-Premixer;

[0048] 31-Particle inlet; 32-Solvent outlet; 33-Solvent pipe; 4-Throttle valve;

[0049] 41-Premix inlet; 42-Diverter; 43-Nozzle; 5-Ejector;

[0050] 51-Inlet; 52-Inlet pipe; 53-Converging section; 54-Throat;

[0051] 55 - Diverging section; 56 - Outlet pipe; 57 - Outlet; 6 - Flow rate regulator;

[0052] 61-Spoiler; 62-Spoiler pivot; 63-Base plate; 64-Reset spring;

[0053] 65 - Throttling plate; 7 - Swirl vane. Detailed Implementation

[0054] Embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein similar or identical reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0055] I. Hybrid Mechanism

[0056] like Figure 1 and Figure 2 The online mixing mechanism for granular pesticides shown mainly consists of three parts from top to bottom: a storage tank 1, a premixer 3, and an ejector 5. Among them:

[0057] 1) The storage tank 1 has a funnel-shaped structure and is sealed with a storage cover 11 on the top. It is used to store and supply granular pesticides to the premixer 3.

[0058] 2) The premixer 3 receives granular pesticide from the storage tank 1 on the one hand, and receives water from the ejector 5 through the throttle valve 4 and related pipelines on the other hand, which is used to initially dissolve and mix the granular pesticide and transport it into the ejector 5.

[0059] 3) One end of the jet injector 5 is provided with an inlet 51 and the other end is provided with an outlet 57. The middle part receives the pesticide premix liquid output by the premixer 3 and is used to complete the final mixing of granular pesticides.

[0060] 1. Storage tank

[0061] like Figures 3 to 5 As shown, the storage tank 1 has a partition 12 inside, which divides the inner cavity into two equal storage areas (based on the water flow direction of the jet injector 5), allowing for the simultaneous dispensing of up to two different granular pesticides. A vibrator 13 is installed on the partition 12 to assist in the downward feeding of granular pesticides through vibration, preventing blockage.

[0062] Both sides of the storage tank 1 are equipped with a feeding port 18 at the bottom of the storage area. Figure 8 or Figure 9 (As shown), and each is equipped with a feed baffle 17 to adjust the opening size. The matching relationship between the feed baffle 17 and the feed port 18 is as follows. Figure 11 As shown: The outer contour of the feeding baffle 17 consists of an Archimedean spiral outer edge and a straight outer edge; the feeding port 18 is elongated; the feeding baffle 17 is rotatably connected to one end of the upper surface of the feeding port 18, and the degree of obstruction of the feeding port 18 (i.e., the opening of the feeding port 18) can be adjusted by rotating the feeding baffle 17, and the adjustment range of the obstruction range covers 0~100%; wherein, based on the strict linear relationship between the polar diameter and polar angle of the Archimedean spiral, when the feeding baffle 17 rotates at different angles, the area of ​​the obstructed feeding port 18 shows a gradual linear change, thereby improving the controllability of the opening adjustment.

[0063] Each feeding baffle 17 is connected to an adjusting rod 16. The upper end of the adjusting rod 16 extends out of the top plate of the storage tank 1 and is connected to the adjusting knob 14. A pre-tensioning spring 15 is also provided between the adjusting rod 16 and the top plate of the storage tank 1 to continuously provide stable downward pressure to the feeding baffle 17 and prevent it from lifting and leaking material.

[0064] 2. Buffer cavity

[0065] like Figure 3 As shown, a buffer chamber 2 is provided between the bottom of the storage tank 1 and the top of the premixer 3, and a buffer 21 is provided inside the buffer chamber 21; a buffer flow channel 22 is provided inside the buffer 21. Figure 8 As shown), the cross-sectional shape of the buffer channel 22 is the same as that of the feed port 18, and it is used to temporarily and quantitatively store the falling granular pesticides.

[0066] like Figure 8 and Figure 9 As shown, to correspond to the two storage areas divided by the storage tank 1, the buffer 21 and the particle inlet 31 at the top of the premixer 3 are also provided with two sets. In each set: the feed port 18 and the particle inlet 31 have the same shape but are staggered in position (in the vertical projection direction); the buffer 21 is rotated so that its upper buffer flow channel 22 can be connected to the feed port 18 or the particle inlet 31 respectively.

[0067] In this embodiment, the buffer 21 is gear-shaped, and the outer edges of the two buffers 21 mesh to ensure synchronous rotation, that is, to ensure that the pesticide granules on both sides are supplied at the same rate; if there is no need for this function, the above gear-shaped structure can be omitted.

[0068] In this embodiment, each buffer 21 is provided with only one buffer channel 22, so that the buffer 21 completes one granular pesticide supply for each rotation. If the supply rate is to be increased, multiple buffer channels 22 can be evenly distributed around the axis of rotation on each buffer 21, so that the buffer 21 completes multiple granular pesticide supplies for each rotation.

[0069] 3. Premixer

[0070] like Figure 9 As shown, the premixer 3 has a cylindrical internal structure with a particle inlet 31 at the top and a funnel-shaped bottom with a solvent outlet 32 ​​at the center. Nozzles 43 are located on the left and right side walls (based on the water flow direction of the ejector 5). Particle pesticides fall into the premixer 3 through the top particle inlet 31 and dissolve and mix with water. Water is injected from the nozzles 43 arranged opposite each other on both sides, forming an impact flow inside the premixer 3, further enhancing the mixing effect of the particles after they disintegrate upon contact with water. Finally, the resulting pesticide premixed liquid flows into the ejector 5 below through the bottom solvent outlet 32.

[0071] 4. Ejector

[0072] like Figures 3 to 5 As shown, the main internal section of the jet ejector 5 is provided with an inlet pipe 52 and a throat pipe 54 sequentially along the water flow direction (from left to right in the diagram). Figure 7 (Part outlined in orange), water outlet pipe 56. Among them:

[0073] 1) The diameter of the throat pipe 54 is smaller than that of the inlet pipe 52 and the outlet pipe 56. The top is connected to the solvent outlet 32 ​​through the solvent pipe 33, and a slot is provided at the bottom to accommodate the throttling plate 65.

[0074] 2) One end of the inlet pipe 52 is provided with an inlet 51, and the other end is connected to the throat pipe 54 through a tapering section 53 (the pipe diameter gradually decreases along the direction of water flow);

[0075] 3) One end of the water outlet pipe 56 is provided with an outlet 57, and the other end is connected to the throat pipe 54 through a gradually expanding section 55 (the pipe diameter gradually expands along the water flow direction); a number of swirling vanes 7 are evenly distributed on the pipe wall. The swirling vanes 7 are divided into two groups, and the two groups rotate in opposite directions (that is, the spiral direction along the water flow is left-handed and the other group is right-handed), in order to enhance the turbulence and improve the mixing effect of the final ejected solution.

[0076] Water enters the jet injector 5 from the inlet 51, comes into contact with the pesticide premixed liquid when it passes through the throat 54, and finally the two are fully mixed under the turbulence of the outlet pipe 56 before being ejected.

[0077] 5. Cache driver structure

[0078] In this embodiment, the water flow in the jet injector 5 is used as the power to drive the buffer 21 to rotate. The rotation speed of the buffer 21 is positively correlated with the water flow speed, thereby realizing the adaptive adjustment of the granular pesticide supply rate according to the water flow rate.

[0079] like Figure 6 As shown, two chambers are symmetrically arranged on the left and right sides of the throat tube 54 as rotor chambers, and an opening 25 is provided between the throat tube 54 and the two rotor chambers. Figure 3 (As shown) are connected. A water turbine rotor 24 is installed inside the rotor chamber. The blades of each of the two water turbine rotors 24 enter the throat pipe 54 through the opening 25 (note: the two water turbine rotors 24 rotate in opposite directions). The blades entering from both sides together occupy one-third of the cross-section of the throat pipe 24. The water turbine rotor 24 rotates horizontally under the impact of the water flowing through the throat pipe 54. A drive shaft 23 is connected to the water turbine rotor 24. The drive shaft 23 passes through the premixer 3 (using a dynamic seal to prevent leakage) and enters the buffer chamber 2, connecting to the buffer 21 and driving the buffer 21 to rotate.

[0080] 6. Premixer inlet structure

[0081] like Figure 4 As shown, a premixing port 41 is provided on the water inlet pipe 52 and is located in front of the tapering section 53. The premixing port 41 is connected to the inlet of the throttle valve 4 through a pipeline, and the outlet of the throttle valve 4 is then divided into two paths by the diverter pipe 42, which are connected to the left and right nozzles 43 respectively.

[0082] Working principle: Since the cross-section of the throat 54 is significantly smaller than that of the inlet pipe 52, under the action of the Venturi effect, the flow velocity of the fluid increases and the pressure decreases when it flows through the throat 54. In this way: on the one hand, the driving force on the turbine rotor 24 is increased by increasing the water flow velocity, so as to ensure the operation of the turbine rotor 24; on the other hand, a pressure difference is generated on both sides of the converging section 53, with the front side being higher than atmospheric pressure and the rear side (i.e., inside the throat 54) being lower than atmospheric pressure, while the pressure inside the premixer 3 is approximately atmospheric pressure. Driven by the pressure difference, part of the fluid in the inlet pipe 52 enters the premixer 3 through the premixing port 41 → throttle valve 4 → diverter pipe 42 → nozzle 43, and then flows back to the throat 54.

[0083] 7. Throat flow rate regulation structure

[0084] like Figure 3 As shown, the jet injector 5 contains a flow rate regulator 6, the specific structure of which is as follows: Figure 10 As shown, it includes a spoiler 61 and a throttle plate 65, which are connected by a swing arm. The middle part of the swing arm is rotatably connected to the jet injector 5 through a spoiler shaft 62.

[0085] The spoiler 61 is an inverted wing structure (similar to the rear spoiler of some cars, with the lower wing surface convex and the upper wing surface flat), located within the tapering section 53. Its function is based on Bernoulli's principle, generating downforce under the action of water flow, which drives the throttle plate 65 to swing upward around the spoiler axis 62.

[0086] The throttling plate 65 is normally housed in a slot at the bottom of the throat 54 and is connected to the slot base plate 63 by a return spring 64. When the flow velocity in the inlet pipe 52 increases to a certain level, the baffle plate 61 generates sufficient downward pressure to overcome the return spring 64, driving the throttling plate 65 to swing upward and invade the inlet throat 54; thereby reducing the cross-sectional area of ​​the throat 54, further increasing the flow velocity within the throat 54, increasing the rotational speed of the buffer 21, that is, increasing the granular pesticide supply rate, and ensuring the accuracy of granular pesticide supply based on jet self-drive.

[0087] Note: This invention is not limited to the above embodiments. For specific application needs:

[0088] The storage tank 1 may contain only one storage area, while retaining the two sets of buffers 21 and their related structures as described in the above embodiment, or only one set of buffers 21 and their related structures may be provided. Alternatively, the storage tank 1 may be divided into more storage areas, such as two on each side, and four sets of buffers 21 and their related structures may be provided accordingly.

[0089] Furthermore, the water turbine rotor 24 does not necessarily have to be an impact-type water turbine as shown in the figure. Other structures such as axial flow can also be used, as long as the water flow can be used as the rotational driving force for the buffer 21.

[0090] II. Theoretical Argumentation

[0091] 1. The granular pesticide supply rate varies linearly with the ejector flow rate:

[0092] (1) When the jet in the throat 54 impacts the impeller of the turbine rotor 24 at low speed, assuming: one-dimensional impact, no loss, no deflection angle (radial impact), and stable operation, the torque generated by the tangential velocity difference of the fluid is: :

[0093]

[0094] In the formula, The flow velocity within the throat 54 Where is the impeller radius, The impeller speed, For fluid density, The cross-sectional area of ​​the throat is 54. ω is the impeller angular velocity.

[0095] When the fluid is stable, the following relationship exists:

[0096]

[0097] In the formula, It is the first-order (linear) drag coefficient.

[0098] Expanded to:

[0099]

[0100] Then the following formula holds true:

[0101]

[0102] because:

[0103] but: ,in It is a constant determined by structure, fluid, and load. Therefore, as the flow rate of the working fluid in the throat increases, the rotational speed of the turbine rotor 24 increases linearly, and the supply rate of granular pesticide also increases linearly.

[0104] (2) When the jet inside the throat 54 impacts the impeller of the turbine rotor 24 at high speed, the load torque becomes:

[0105]

[0106] When the flow field is stable, the following relationship exists:

[0107]

[0108] Solving for the given information, we get:

[0109]

[0110] but: When it is large, ,Right now That is, when the flow velocity in the throat increases to a certain level, the linear relationship at low and medium speeds no longer holds because the load increases quadratically, and the critical velocity... Based on the critical condition (linear resistance = square resistance), Calculations were performed to obtain the critical angular velocity as follows: Substituting the critical angular velocity back, we get:

[0111]

[0112] Therefore, the working fluid flow rate within the throat 54 is greater than When the rotational speed of the water turbine rotor 24 and the buffer 21 no longer increases linearly, the flow rate regulator 6 designed in this invention needs to play an active role.

[0113] (3) Based on the working principle of the flow rate regulator 6 mentioned above, by designing corresponding structural parameters (such as the dimensions of the spoiler 61 and the throttle plate 65, the tension of the return spring 64, the length of the swing arm, etc.), the flow rate in the throat 54 is at a high speed (i.e., ≥ When the flow is in the throat 54, the downward pressure generated by the baffle 61 can drive the throttle plate 65 to swing upward and invade the throat 54, thereby further increasing the flow velocity in the throat 54 and increasing the driving force on the turbine rotor 24, so that the speed of the turbine rotor 24 can still maintain or be close to a linear relationship with the total flow rate of the jet 5 (i.e. the flow rate from the inlet 51 to the outlet 57).

[0114] 2. The concentration of the pesticide mixture output by the ejector is stable:

[0115] The final output mixture from ejector 5 is formed by the convergence of two streams: one stream flows continuously along the main stream through throat 54, and the other stream is the pesticide premix output from premixer 3. The flow rates of these streams are as follows:

[0116]

[0117] In the formula, For mixed traffic, The flow rate is 54 for the trachea. This refers to the flow rate of the premixed liquid;

[0118] Let the inlet velocity of throat 54 be... The mixed flow rate at the outlet is 57 with a flow velocity of Then the momentum equation is:

[0119]

[0120] Let the cross-sectional area of ​​the throat tube 54 be... The cross-sectional area of ​​outlet 57 is Then we have:

[0121]

[0122]

[0123] Under the condition that the device structure remains unchanged:

[0124]

[0125] Substituting into the momentum equation, we get:

[0126]

[0127] In the formula The ejection coefficient is determined by the structure. This indicates that the flow rate of the premixed liquid output from the premixer 3 changes proportionally to the flow rate through the throat 54. This phenomenon helps to ensure the stability of the final pesticide mixture composition, preventing it from becoming thicker or thinner with changes in flow rate.

[0128] 3. The water level in the premixer is stable.

[0129] Changes in flow rate within a pipeline will cause changes in pressure, according to Bernoulli's equation:

[0130]

[0131] In the formula, The water pressure in the inlet pipe 52 (straight section) is... For the inlet water flow rate, The water pressure inside the throat 54. This is the resistance coefficient within the larynx;

[0132] Because the Reynolds coefficient (Re) within the 54th larynx is sufficiently large, the drag coefficient... It is approximately a constant, and Then it exists:

[0133]

[0134] because:

[0135]

[0136] but:

[0137]

[0138] Similarly, for throttle valve 4, the flow rate passing through it... (i.e., the flow rate input into premixer 3) and The relationships between them are:

[0139]

[0140] Therefore, the input flow of premixer 3 and The change is proportional, combined with the output flow of premixer 3 mentioned earlier. It is also proportional to This will cause the input and output of the premixer 3 to increase or decrease synchronously. This mechanism will help ensure that the liquid level in the premixer 3 remains stable and ensure the operation of the mixing mechanism.

[0141] III. Spraying Device

[0142] like Figure 12 The image shows an online mixing and spraying device for granular pesticides based on the above-described mixing mechanism, wherein:

[0143] 1) The water inlet 51 is connected to a water source for water supply, which may include, for example, a water tank, a filter, and a water pump. To facilitate the adjustment of the water supply flow, a throttle valve, a pressure gauge, and a flow meter may be installed on the water supply pipeline. To improve safety, a safety valve may also be installed on the water supply pipeline.

[0144] 2) The outlet 57 is connected to the atomizing nozzle. The example shown in the figure uses pneumatic atomization. The air supply pipeline, consisting of an air source, air filter, air compressor, throttle valve, and pressure gauge, supplies air to the atomizing nozzle. In addition, other spraying methods such as swirl atomization and electrostatic atomization can also be used.

[0145] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0146] This invention is not limited to the above-described embodiments. Any obvious improvements, substitutions, or modifications that can be made by those skilled in the art without departing from the essence of this invention are within the scope of protection of this invention.

Claims

1. An online mixing mechanism for granular pesticides, characterized in that: include: Premixer (3): It has a particle inlet (31) at the top, a solvent outlet (32) at the bottom, and a nozzle (43) on the side wall; Ejector (5): It is provided with an inlet pipe (52), a throat pipe (54), and an outlet pipe (56) in sequence; the inlet pipe (52) is provided with a premixing port (41) and is connected to the nozzle (43) through a pipeline; the throat pipe (54) has a smaller diameter than the inlet pipe (52) and the outlet pipe (56), and its top is connected to the solvent outlet (32) through a solvent pipe (33).

2. The online mixing mechanism for granular pesticides according to claim 1, characterized in that: The inner wall of the water outlet pipe (56) is provided with swirling vanes (7), which are divided into two groups with opposite swirling directions.

3. The online mixing mechanism for granular pesticides according to claim 1, characterized in that: It also includes a storage tank (1), which is located above the premixer (3) and has a feed port (18) at the bottom; A buffer (21) is provided between the storage tank (1) and the premixer (3). The buffer (21) has one or more buffer channels (22). The same buffer channel (22) can be moved to be connected to the feed port (18) or to be connected to the particle inlet (31).

4. The online mixing mechanism for granular pesticides according to claim 3, characterized in that: The buffer (21) is driven to rotate by the water flow in the throat (54) to switch the docking position of the buffer channel (22).

5. The online mixing mechanism for granular pesticides according to claim 4, characterized in that: A water turbine rotor (24) is provided on the side of the throat (54). The water turbine rotor (24) partially penetrates the throat (54) and is driven by the water flow. It drives the buffer (21) to rotate through the drive shaft (23).

6. The online mixing mechanism for granular pesticides according to claim 5, characterized in that: The storage tank (1) is divided into two storage areas by a partition (12), and each storage area is provided with a feeding port (18) at the bottom. The buffer (21), drive shaft (23), and water turbine rotor (24) are provided in two sets, with the water turbine rotor (24) symmetrically distributed on the left and right sides of the throat (54); the two buffers (21) rotate synchronously through gear meshing.

7. The online mixing mechanism for granular pesticides according to claim 4, characterized in that: The jet ejector (5) is equipped with a flow rate regulator (6), including a baffle (61) and a throttle plate (65), which are connected by a swing arm. The throttle plate (65) is placed in a slot on the throat (54) and is equipped with a return spring (64). The baffle (61) is located in the inlet pipe (52). Its structure is based on Bernoulli's principle. It is subjected to water flow and generates a swaying force on the swing arm. When the flow rate exceeds a predetermined value, it overcomes the return spring (64) and drives the throttle plate (65) to sway and invade the throat (54).

8. The online mixing mechanism for granular pesticides according to claim 3, characterized in that: The storage tank (1) is equipped with a vibrator (13); The feed port (18) is long and narrow, and a feed baffle (17) is provided on it. The outer contour of the feed baffle (17) is composed of an Archimedes spiral outer edge and a straight outer edge. It is connected to the adjustment knob (14) outside the storage tank (1) through the adjustment rod (16). The opening size of the feed port (18) is adjusted by rotating the feed baffle (17).

9. The online mixing mechanism for granular pesticides according to claim 1, characterized in that: There are two nozzles (43) with opposite positions; the premix port (41) is connected to the throttle valve (4), and then connected to the nozzles (43) on both sides by the split pipe (42).

10. A spraying device, characterized in that: The granular pesticide online mixing mechanism according to any one of claims 1 to 9 includes an inlet pipe (52) connected to a water source and an outlet pipe (56) connected to an atomizing nozzle.

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