Parameter-adjustable micro-droplet generating device and method of using the same

Abstract

The present invention discloses a parameter-adjustable micro-droplet generating device, comprising a mounting frame (1), wherein the mounting frame (1) is provided with a droplet extrusion mechanism, a speed control mechanism and a stage (2), wherein a nozzle (3) of the droplet extrusion mechanism is located directly above the stage (2) and at the outlet end of a hollow glass tube (4) serving as an airflow channel in the speed control mechanism; the micro-droplet generating device controls the diameter of the droplet and the number of single droplets through the droplet extrusion mechanism, and controls the speed of the droplet falling through the speed control mechanism. The micro-droplet generating device of the present invention can generate single or multiple pesticide droplets with controllable diameter and controllable speed, and can be widely used to study the influence of droplet speed and diameter on the diffusion of droplets on plant surfaces and pesticide property testing, and can also study the collision and fusion phenomenon of multiple droplets, so as to provide a theoretical basis for reducing the use of pesticides and pesticide residues in the future, and has broad application prospects.

Description

Technical Field

[0001] The present invention relates to the field of agricultural technology, and specifically to a pesticide droplet generating device for use in the field of plant protection, specifically to a parameter-adjustable micro-droplet generating device and a method for using the same; the device can generate pesticide droplets of different diameters and different speeds, and predict the influence of droplet diameter and speed on the wetting characteristics of pesticide droplets on plant surfaces, and can also realize the collision and fusion phenomenon of multiple droplets, so as to provide a theoretical basis for reducing pesticide use and pesticide residues in the future. Background Art

[0002] The process of pesticide droplets wetting plant surfaces belongs to the problem of droplets hitting solid surfaces, which is a free surface flow problem in fluid mechanics. The study of the problem of droplets hitting surfaces has important theoretical and practical significance, and the results can be used to guide the development of spray machinery. Droplet diameter and droplet impact velocity are the main factors affecting the wetting characteristics of pesticide droplets. The Chinese patent application number 201710846594.1 "A single droplet generating device for plant protection" discloses a generating device for generating a single droplet, which provides a voltage signal to a piezoelectric copper sheet through a voltage signal generator, causing the piezoelectric copper sheet to vibrate and generate tiny droplets. At the same time, the droplet velocity that the device can achieve is not specified. The Chinese patent application number 201310415264.9 "A device and method for generating pesticide quantitative diameter spray droplets" discloses a generating device and method for generating quantitative diameter spray droplets, which drives the screw through a driving motor, and the slider on the screw drives the droplet generator to generate spray droplets. At the same time, the droplet velocity that the device can achieve is not specified. Summary of the invention

[0003] The purpose of the present invention is to provide a parameter-adjustable tiny droplet generating device and a method of using the same in response to the problems existing in the prior art; the device can generate pesticide droplets of different diameters and different speeds, and predict the influence of droplet diameter and speed on the wetting characteristics of pesticide droplets on plant surfaces. In addition, it can also realize the collision and fusion phenomenon of multiple droplets, so as to provide a theoretical basis for reducing pesticide use and pesticide residues in the future.

[0004] The purpose of the present invention is to be solved by the following technical solutions:

[0005] A parameter-adjustable tiny droplet generating device comprises a mounting frame, characterized in that: a droplet extrusion mechanism, a speed control mechanism and a stage are arranged on the mounting frame, the nozzle of the droplet extrusion mechanism is located directly above the stage and at the outlet end of a hollow glass tube serving as an air flow channel in the speed control mechanism; the tiny droplet generating device controls the diameter of the droplets and the number of single droplets by the droplet extrusion mechanism, and controls the speed of droplet falling by the speed control mechanism.

[0006] The speed control mechanism includes a horizontally placed peristaltic pump, an air-transmitting silicone tube and a vertically arranged hollow glass tube, one end of the air-transmitting silicone tube is connected to the air flow outlet of the peristaltic pump, and the other end is sealed and connected to the top of the hollow glass tube; the stable airflow generated by the peristaltic pump reaches the hollow glass tube through the air-transmitting silicone tube, and the airflow gives the droplets sprayed from the nozzle a speed.

[0007] The droplet extrusion mechanism includes a liquid inlet ball screw slide, a push plate, a micro-injector, a droplet silicone tube and a nozzle located on the top of the mounting frame. The push plate is arranged on the traveling component of the liquid inlet ball screw slide and the push plate is arranged at the tail end of the micro-injector. The liquid inlet ball screw slide pushes the micro-injector through the push plate to realize the generation of tiny droplets. The inlet end of the droplet silicone tube is connected to the tiny droplet generation end of the micro-injector, and its outlet end is connected to the inlet end of the nozzle. The micro-injector, the droplet silicone tube and the nozzle constitute a tiny droplet supply mechanism.

[0008] Multiple micro-injectors are arranged on the micro-injector fixing frame of the liquid inlet ball screw slide. The front end of each micro-injector is provided with a droplet silicone tube and a nozzle that match it one by one. The one-to-one corresponding micro-injectors, droplet silicone tubes and nozzles constitute multiple groups of tiny droplet supply mechanisms to achieve the generation of multiple droplets.

[0009] The micro-droplet supply mechanism is provided with a diverter, which includes a three-way joint, the inlet ends of the three-way joint are respectively connected to the micro-droplet generating ends of the corresponding micro-injectors, one outlet end of the three-way joint is connected to one end of a droplet silicone tube with a control switch, and the other outlet end is connected to one end of a diverter tube with a control switch. The setting of the diverter can enable the feeding of the liquid inlet ball screw slide to supply a single micro-droplet or multiple micro-droplets.

[0010] The mounting frame is also provided with a vertical ball screw slide arranged vertically and a horizontal ball screw slide arranged horizontally. A fixing frame is installed on the moving part of the vertical ball screw slide. The hollow glass tube is fixedly installed on the fixing frame through a clamping frame. The nozzle is installed on the rotating shaft and the rotating shaft is installed on the fixing frame through a set screw, so that the nozzle can adjust its direction by rotating the rotating shaft; the stage is installed on the moving part of the horizontal ball screw slide; through the up and down relative displacement of the vertical ball screw slide and the left and right relative displacement of the horizontal ball screw slide, the position change of the sample on the stage relative to the nozzle and the change of the droplet falling height can be realized.

[0011] The nozzle is arranged to be tilted downward relative to the horizontal plane; and when a plurality of nozzles are arranged, the nozzles are evenly arranged along the circumference of the hollow glass tube.

[0012] A method for using a parameter-adjustable micro-droplet generating device, characterized in that the device is used to generate micro-droplets of a certain diameter in the following steps:

[0013] A1. Fill the micro-injector, liquid drop silicone tube and nozzle with liquid medicine, and fix the micro-injector with a micro-injector fixing bracket;

[0014] A2. The driving motor of the liquid inlet ball screw slide works, the screw rotates and converts into linear motion, and pushes the tail end of the micro-injector through the push plate, releasing the corresponding volume of liquid with the required diameter droplet from the nozzle;

[0015] A3. Measure the diameter d of the released droplet and calculate the correction factor k of the diameter of the released droplet using the formula corresponding to the diameter of the droplet d , the formula is: Where x is the feed amount of the liquid-intake ball screw slide, V L is the measuring range of the micro-injector, L is the length corresponding to the measuring range of the micro-injector, k d is the diameter correction coefficient, d is the droplet diameter;

[0016] A4. Based on the calculated diameter correction factor k d Determine the feed rate x of the new liquid-intake ball screw slide that meets the requirements k , and according to x k Regenerate droplets of the desired diameter.

[0017] The micro-injector, liquid drop silicone tube and nozzle in step (A1) are filled with liquid medicine, which means that when multiple sets of micro-injectors, liquid drop silicone tubes and nozzles are all filled with liquid medicine, it is necessary to open the control switch on the corresponding liquid drop silicone tube according to the required number of droplets.

[0018] A method for using a parameter-adjustable micro-droplet generating device, characterized in that the method steps for using the device to impart a given velocity to the droplets are as follows:

[0019] B1. After the droplets of a determined diameter are released, the peristaltic pump is started;

[0020] B2, injecting the required flow rate of the droplet of determined diameter into the hollow glass tube through a peristaltic pump;

[0021] B3. Determine the velocity v of the released droplet of a certain diameter, and calculate the velocity correction coefficient k of the released droplet of a certain diameter by the formula corresponding to the velocity of the droplet v , the formula is: V = 15k v πD 2 v, where V is the flow rate, D is the inner diameter of the glass tube, v is the droplet velocity, k v is the speed correction factor;

[0022] B4. According to the calculated speed correction factor k v Determine the flow rate V of the new peristaltic pump that meets the requirements k , and according to V k Regenerate the desired droplet velocity.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] The parameter-adjustable tiny droplet generating device provided by the present invention mainly includes four parts in terms of functions: a droplet diameter control part, a multi-droplet generating part, a speed control part and a moving platform part. The device can generate a single droplet with a given speed, so that the state of the pesticide droplets falling on the plant leaves can be detected, and the influence of different droplet diameters and different speeds on the wetting characteristics of the droplets on the plant leaf surface can be studied. At the same time, the collision and fusion phenomenon of multiple droplets can be observed, so as to provide a theoretical basis for reducing the use of pesticides and pesticide residues in the future. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Attached Figure 1 It is a front view structural schematic diagram of the parameter-adjustable micro-droplet generating device of the present invention;

[0026] Attached Figure 2 It is a schematic diagram of the axial structure of the parameter-adjustable micro-droplet generating device of the present invention;

[0027] Attached Figure 3 It is a partial device diagram of the liquid droplet extrusion mechanism in the device of the present invention;

[0028] Attached Figure 4 A top view of the relative positions of the nozzles in the device of the present invention;

[0029] Attached Figure 5 It is a front view of the relative positions of the nozzles in the device of the present invention;

[0030] Attached Figure 6 It is a schematic diagram of the structure of the diverter in the device of the present invention;

[0031] Attached Figure 7 It is a schematic diagram of a droplet diameter control part in the device of the present invention;

[0032] Attached Figure 8 A diagram of the steps of the method for imparting a given velocity to a droplet of the device of the present invention.

[0033] Among them: 1—installation frame; 2—stage; 3—nozzle; 4—hollow glass tube; 5—peristaltic pump; 6—gas delivery silicone tube; 7—liquid inlet ball screw slide; 8—push plate; 9—microinjector; 10—drop silicone tube; 11—microinjector fixing bracket; 12—diverter; 13—three-way connector; 14—control switch; 15—diverter; 16—vertical ball screw slide; 17—horizontal ball screw slide; 18—fixed bracket; 19—clamping bracket; 20—rotating shaft; 21—fastening screw. DETAILED DESCRIPTION

[0034] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0035] like Figure 1-6 As shown: a parameter-adjustable tiny droplet generating device comprises a mounting frame 1, on which a droplet extrusion mechanism, a speed control mechanism and a stage 2 are arranged, a nozzle 3 of the droplet extrusion mechanism is located directly above the stage 2 and at the outlet end of a hollow glass tube 4 serving as an air flow channel in the speed control mechanism; the tiny droplet generating device controls the diameter of the droplets and the number of single droplets through the droplet extrusion mechanism, and controls the speed at which the droplets fall through the speed control mechanism. A vertical ball screw slide 16 and a horizontal ball screw slide 17 are also provided on the mounting frame 1. A fixing frame 18 is installed on the moving part of the vertical ball screw slide 16. The hollow glass tube 4 is fixedly installed on the fixing frame 18 by a clamping frame 19. The nozzle 3 is installed on the rotating shaft 20 and the rotating shaft 20 is installed on the fixing frame 18 by a set screw 21, so that the nozzle 3 can be adjusted in direction by rotating the rotating shaft 20 to change the position of the nozzle 3 relative to the hollow glass tube 4; the stage 2 is installed on the moving part of the horizontal ball screw slide 17; through the up-and-down relative displacement of the vertical ball screw slide 16 and the left-and-right relative displacement of the horizontal ball screw slide 17, the position change of the sample on the stage 2 relative to the nozzle 3 and the change of the droplet falling height can be realized.

[0036] like Figure 1-2 As shown, the speed control mechanism includes a horizontally placed peristaltic pump 5, an air delivery silicone tube 6 and a vertically arranged hollow glass tube 4, one end of the air delivery silicone tube 6 is connected to the air flow outlet of the peristaltic pump 5, and the other end is sealed and connected to the top of the hollow glass tube 4; when in use, the stable airflow generated by the peristaltic pump 5 reaches the hollow glass tube 4 through the air delivery silicone tube 6, and the airflow gives the droplet speed sprayed from the nozzle 3.

[0037] like Figure 1-3As shown, the droplet extrusion mechanism includes a liquid inlet ball screw slide 7, a push plate 8, a micro-injector 9, a droplet silicone tube 10 and a nozzle 3 located on the top of the mounting frame 1. The push plate 8 is arranged on the moving part of the liquid inlet ball screw slide 7 and the push plate 8 is arranged at the tail end of the micro-injector 9. The liquid inlet ball screw slide 7 pushes the micro-injector 9 through the push plate 8 to realize the generation of tiny droplets. The inlet end of the droplet silicone tube 10 is connected to the tiny droplet generating end of the micro-injector 9, and the outlet end thereof is connected to the inlet end of the nozzle 3. The micro-injector 9, the droplet silicone tube 10 and the nozzle 3 constitute a tiny droplet supply mechanism. A plurality of micro-injectors 9 are arranged on a micro-injector fixing frame 11 of a liquid inlet ball screw slide 7. The front end of each micro-injector 9 is provided with a liquid drop silicone tube 10 and a nozzle 3 that match it one by one. The corresponding micro-injectors 9, liquid drop silicone tubes 10 and nozzles 3 form a plurality of groups of tiny droplet supply mechanisms to realize the generation of multiple droplets. Figure 6 As shown, a flow divider 12 is provided in the micro-droplet supply mechanism, and the flow divider 12 includes a three-way joint 13, the inlet ends of the three-way joint 13 are respectively connected to the micro-droplet generating ends of the corresponding micro-injector 9, one outlet end of the three-way joint 13 is connected to one end of the droplet silicone tube 10 with a control switch 14, and the other outlet end is connected to one end of the shunt tube 15 with the control switch 14. The setting of the flow divider 12 can make the feeding of the liquid inlet ball screw slide 7 able to supply a single micro-droplet or a plurality of micro-droplets; Figure 1-2 As shown, by controlling the three flow dividers 12, the falling of a single droplet and the collision and fusion of two or three droplets can be achieved. Figure 4 As shown, the nozzle 3 is arranged to be tilted downward relative to the horizontal plane; and when multiple nozzles 3 are provided, the nozzles 3 are evenly arranged along the circumference of the hollow glass tube 4 .

[0038] In the technical solution provided by the present invention, the droplet diameter control part is realized in the following manner: the liquid inlet ball screw slide 7 is placed horizontally, the micro-injector fixing frame 11 is placed on the liquid inlet ball screw slide 7 and fixedly connected by bolts to ensure that the micro-injector 9 and the liquid inlet ball screw slide 7 are level, the micro-injector 9 is connected to the nozzle 3 through the droplet silicone tube 10, and the droplet diameter is controlled by controlling the feed amount of the liquid inlet ball screw slide 7 to push the micro-injector 9. The driving motor of the liquid inlet ball screw slide 7 adopts a 57 stepper motor with a step angle of 1.8° and a body length of 596mm. The motor and the ball screw are connected by a coupling to ensure the high transmission accuracy of the ball screw. The ball screw adopts 1204-500, in which the screw diameter is 12mm and the pitch is 4mm, that is, the ball screw moves 4mm when the motor rotates one circle. The effective stroke is 500mm and the minimum propulsion accuracy is 0.02mm, which can complete the generation of single pesticide droplets of 100 microns to 500 microns.

[0039] The multi-droplet generation part is achieved in the following way: a diverter 12 is added between the micro-injector 9 and the nozzle 3, and the generation of a single droplet, two droplets and three droplets is achieved by controlling the control switch 14 on the diverter 12, and the collision and fusion of the droplets are achieved by changing the position of the nozzle 3 relative to the hollow glass tube 4.

[0040] The speed control part is realized in the following manner: the peristaltic pump 5 is connected to the gas delivery silicone tube 6, and the gas delivery silicone tube 6 is connected to the hollow glass tube 4. The droplet speed is controlled by controlling the flow rate of the peristaltic pump 5. The flow rate value of the peristaltic pump 5 is adjustable within 0 to 1911 ml / min, and the accuracy reaches ml level, which can realize the droplet speed between 0.5 and 1 m / s.

[0041] The mobile platform is realized in the following way: the mobile platform is composed of a vertical ball screw slide 16, a horizontal ball screw slide 17 and a stage 2, and the mobile platform is located below the nozzle 3. The stage 2 is fixed on the slide of the horizontally placed horizontal ball screw slide 17 to fix the object to be measured. The motors of the two ball screw slides use 57 stepper motors, which use a 1.8° step angle and a body length of 644mm. The ball screw and the motor are connected through a coupling to ensure the high transmission accuracy of the ball screw; the ball screw uses 1605-450, in which the screw diameter is 16mm and the pitch is 5mm, that is, the ball screw moves 5mm when the motor rotates one circle, and the effective stroke of the ball screw is 450mm. The up and down movement of the nozzle 3 is realized by controlling the movement of the slide of the vertical ball screw slide 16, and together with the horizontally placed horizontal ball screw slide 17, the mobile platform is formed to ensure the convenience of the stage 2 operation. The function of the horizontal ball screw slide 17 is to change the relative position of the stage 2 and the nozzle 3, making the operation of the sample more convenient; the function of the vertical ball screw slide 16 is to change the relative height of the nozzle 3 relative to the stage 2, so as to study the influence of different falling heights on the droplets. The cooperation of the vertical ball screw slide 16 and the horizontal ball screw slide 17 can realize the relative displacement left and right and up and down, realize the change of the position of the sample relative to the nozzle 3 and the change of the droplet falling height.

[0042] like Figure 7 As shown: A method for using a parameter-adjustable micro-droplet generating device, the method steps for using the device to generate micro-droplets of a certain diameter are as follows:

[0043] A1. Fill the micro-injector 9, the liquid drop silicone tube 10 and the nozzle 3 with liquid medicine, and use the micro-injector fixing frame 11 to fix the micro-injector 9; when the micro-injector 9, the liquid drop silicone tube 10 and the nozzle 3 in step (A1) are filled with liquid medicine, it means that multiple groups of micro-injectors 9, liquid drop silicone tubes 10 and nozzles 3 are all filled with liquid medicine, then it is necessary to open the control switch 14 on the corresponding liquid drop silicone tube 10 according to the number of required droplets;

[0044] A2. The driving motor of the liquid inlet ball screw slide 7 works, the screw rotates and is converted into a linear motion to push the tail end of the micro-injector 9 through the push plate 8, and the corresponding volume of liquid of the required diameter droplet is released from the nozzle 3;

[0045] A3. Measure the diameter d of the released droplet and calculate the correction factor k of the diameter of the released droplet using the formula corresponding to the diameter of the droplet d , the formula is: Where x is the feed amount of the liquid-intake ball screw slide, V L is the measuring range of the micro-injector, L is the length corresponding to the measuring range of the micro-injector, k d is the diameter correction coefficient, d is the droplet diameter;

[0046] A4. Based on the calculated diameter correction factor k d Determine the feed amount x of the new liquid-intake ball screw slide 7 that meets the requirements k , and according to x k Regenerate droplets of the desired diameter.

[0047] like Figure 8 As shown: A method for using a parameter-adjustable micro-droplet generating device, the method steps for the device to give a given speed to the droplets are as follows:

[0048] B1. After the droplets of determined diameter are released, the peristaltic pump 5 is started;

[0049] B2, injecting the flow rate of the droplets of the determined diameter at the required speed into the hollow glass tube 4 through the peristaltic pump 5;

[0050] B3. Determine the velocity v of the released droplet of a certain diameter, and calculate the velocity correction coefficient k of the released droplet of a certain diameter by the formula corresponding to the velocity of the droplet v , the formula is: V = 15k v πD 2 v, where V is the flow rate, D is the inner diameter of the glass tube, v is the droplet velocity, k v is the speed correction factor;

[0051] B4. According to the calculated speed correction factor k v Determine the flow rate V of the new peristaltic pump 5 that meets the requirements k, and according to V k Regenerate the desired droplet velocity.

[0052] like Figure 1-6 As shown, in the initial stage, the micro-injector 9, the droplet silicone tube 10 and the nozzle 3 are all filled with liquid medicine. After calculating the feed amount of the micro-injector 9 corresponding to the droplet of the required diameter, the push plate 8 is driven by the movement of the liquid inlet ball screw slide 7 to push the micro-injector 9 to achieve feeding. The liquid medicine in the micro-injector 9 pushes the liquid medicine in the droplet silicone tube 10 and the nozzle 3, so that the droplets corresponding to the pushing distance of the micro-injector 9 are released from the nozzle 3. The minimum propulsion accuracy of the liquid inlet ball screw slide 7 is less than 0.02mm, which can complete the generation of single pesticide droplets of 100 microns to 500 microns. Measure the diameter d of the released droplet, and calculate the diameter correction coefficient k of the released droplet through the formula corresponding to the diameter of the droplet d , the formula is: Where x is the feed amount of the liquid-intake ball screw slide, V L is the measuring range of the micro-injector, L is the length corresponding to the measuring range of the micro-injector, k d is the diameter correction coefficient, d is the droplet diameter; according to the calculated diameter correction coefficient k d Determine the feed amount x of the new liquid-intake ball screw slide 7 that meets the requirements k , and according to x k Regenerate droplets of the desired diameter.

[0053] like Figure 1-6 As shown, before the droplets of the required diameter are generated, the peristaltic pump 5 is temporarily not started; after the droplets of the required diameter are generated, the peristaltic pump 5 is started to generate airflow, and the airflow passes through the gas delivery silicone tube 6 to reach the hollow glass tube 4, generating a stable airflow in the hollow glass tube 4 to drive the movement of the droplets; the velocity v of the released droplets of the determined diameter is measured, and the velocity correction coefficient k of the released droplets of the determined diameter is calculated by the formula corresponding to the velocity of the droplets v , the formula is: V = 15k v πD 2 v, where V is the flow rate, D is the inner diameter of the glass tube, v is the droplet velocity, k v is the speed correction coefficient; according to the calculated speed correction coefficient k v Determine the flow rate V of the new peristaltic pump 5 that meets the requirements k , and according to V k Regenerate the desired droplet velocity.

[0054] The parameter-adjustable tiny droplet generating device provided by the present invention mainly includes four parts in terms of functions: a droplet diameter control part, a multi-droplet generating part, a speed control part and a moving platform part. The device can generate a single droplet with a given speed, so that the state of the pesticide droplets falling on the plant leaves can be detected, and the influence of different droplet diameters and different speeds on the wetting characteristics of the droplets on the plant leaf surface can be studied. At the same time, the collision and fusion phenomenon of multiple droplets can be observed, so as to provide a theoretical basis for reducing the use of pesticides and pesticide residues in the future.

[0055] The above embodiments are only for illustrating the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the present invention; any technology not involved in the present invention can be realized by existing technologies.

Claims

1. A parameter-adjustable micro-droplet generating device, comprising a mounting frame (1), characterized in that: The installation frame (1) is provided with a droplet extrusion mechanism, a speed control mechanism and a stage (2), the nozzle (3) of the droplet extrusion mechanism is located directly above the stage (2) and at the outlet end of the hollow glass tube (4) serving as an air flow channel in the speed control mechanism; the tiny droplet generating device controls the diameter of the droplets and the number of single droplets through the droplet extrusion mechanism, and controls the speed of droplet dripping through the speed control mechanism; the speed control mechanism comprises a horizontally placed peristaltic pump (5), an air supply silicone tube (6) and a vertically arranged hollow glass tube (4), one end of the air supply silicone tube (6) is connected to the air flow outlet of the peristaltic pump (5), and the other end is sealedly connected to the top end of the hollow glass tube (4); the stable airflow generated by the peristaltic pump (5) reaches the hollow glass tube (4) through the air supply silicone tube (6), and the airflow gives the nozzle (3) a droplet speed; the droplet extrusion mechanism comprises a liquid inlet ball screw slide (7), a push plate (8), and a push plate (9) located at the top of the installation frame (1); A micro-injector (9), a liquid drop silicone tube (10) and a nozzle (3); a push plate (8) is arranged on a moving part of a liquid inlet ball screw slide (7) and the push plate (8) is arranged at the tail end of the micro-injector (9); the liquid inlet ball screw slide (7) pushes the micro-injector (9) through the push plate (8) to realize the generation of micro-droplets; the inlet end of the liquid drop silicone tube (10) is connected to the micro-droplet generation end of the micro-injector (9), and the outlet end thereof is connected to the inlet end of the nozzle (3); the micro-droplet generation end of the liquid drop silicone tube (10) is connected to the micro-droplet generation end of the micro-injector (9), and the outlet end thereof is connected to the inlet end of the nozzle (3); A micro-injector (9), a liquid drop silicone tube (10) and a nozzle (3) constitute a micro-drop supply mechanism; a plurality of micro-injectors (9) are arranged on a micro-injector fixing frame (11) of a liquid inlet ball screw slide (7), and a liquid drop silicone tube (10) and a nozzle (3) that match the micro-injector (9) are arranged at the front end thereof, and the micro-injectors (9), the liquid drop silicone tubes (10) and the nozzle (3) that correspond to each other constitute multiple groups of micro-drop supply mechanisms to realize the generation of multiple droplets; The method steps for the device to generate tiny droplets of a certain diameter are as follows: A1. Fill the micro-injector (9), the liquid drop silicone tube (10) and the nozzle (3) with liquid medicine, and fix the micro-injector (9) using the micro-injector fixing frame (11); A2, the driving motor of the liquid inlet ball screw slide (7) works, the screw rotates and is converted into linear motion to push the tail end of the micro-injector (9) through the push plate (8), and the corresponding volume of liquid of the required diameter droplet is released from the nozzle (3); A3. Measure the diameter d of the released droplet and calculate the correction factor k of the diameter of the released droplet using the formula corresponding to the diameter of the droplet d , the formula is: Where x is the feed amount of the liquid-intake ball screw slide, V L is the measuring range of the micro-injector, L is the length corresponding to the measuring range of the micro-injector, k d is the diameter correction coefficient, d is the droplet diameter; A4. Based on the calculated diameter correction factor k d Determine the feed rate x of the new liquid-intake ball screw slide (7) that meets the requirements k , and according to x k Regenerate droplets of desired diameter; The method steps for the device to impart a given velocity to a droplet are as follows: B1. After the droplets of a determined diameter are released, the peristaltic pump (5) is started; B2, injecting a flow rate of a droplet of a determined diameter at a required speed into the hollow glass tube (4) through a peristaltic pump (5); B3. Determine the velocity v of the released droplet of a certain diameter, and calculate the velocity correction coefficient k of the released droplet of a certain diameter by the formula corresponding to the velocity of the droplet v , the formula is: V = 15k v πD 2 v, where V is the flow rate, D is the inner diameter of the glass tube, v is the droplet velocity, k v is the speed correction factor; B4. According to the calculated speed correction factor k v Determine the flow rate V of the new peristaltic pump (5) that meets the requirements k , and according to V k Regenerate the desired droplet velocity.

2. The parameter-adjustable micro-droplet generating device according to claim 1, characterized in that: The micro-droplet supply mechanism is provided with a flow divider (12), which includes a three-way joint (13). The inlet ends of the three-way joint (13) are respectively connected to the micro-droplet generating ends of the corresponding micro-injector (9), one outlet end of the three-way joint (13) is connected to one end of a droplet silicone tube (10) with a control switch (14), and the other outlet end is connected to one end of a flow divider (15) with a control switch (14). The arrangement of the flow divider (12) enables the feeding of the liquid inlet ball screw slide (7) to supply a single micro-droplet or a plurality of micro-droplets.

3. The parameter-adjustable micro-droplet generating device according to claim 1, characterized in that: The mounting frame (1) is also provided with a vertical ball screw slide (16) and a horizontal ball screw slide (17). A fixing frame (18) is installed on the moving part of the vertical ball screw slide (16). The hollow glass tube (4) is fixedly installed on the fixing frame (18) through a clamping frame (19). The nozzle (3) is installed on a rotating shaft (20) and the rotating shaft (20) is installed on the fixing frame (18) through a set screw (21), so that the nozzle (3) can be adjusted in direction by rotating the rotating shaft (20). The stage (2) is installed on the moving part of the horizontal ball screw slide (17). By the up-and-down relative displacement of the vertical ball screw slide (16) and the left-and-right relative displacement of the horizontal ball screw slide (17), the position change of the sample on the stage (2) relative to the nozzle (3) and the change of the droplet falling height can be achieved.

4. The parameter-adjustable micro-droplet generating device according to claim 1, characterized in that: The nozzle (3) is arranged to be tilted downward relative to a horizontal plane; and when a plurality of nozzles (3) are provided, the nozzles (3) are evenly arranged along the circumference of the hollow glass tube (4).

5. The parameter-adjustable micro-droplet generating device according to claim 1, characterized in that: The micro-injector (9), the liquid drop silicone tube (10) and the nozzle (3) in step A1 are filled with liquid medicine, which means that when multiple sets of micro-injectors (9), liquid drop silicone tubes (10) and nozzles (3) are all filled with liquid medicine, it is necessary to open the control switch (14) on the corresponding liquid drop silicone tube (10) according to the number of required liquid droplets.

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