Flue-cured tobacco topdressing device capable of automatically controlling fertilizer concentration

Abstract

The utility model discloses a flue-cured tobacco topdressing device capable of automatically controlling fertilizer concentration, which relates to the technical field of flue-cured tobacco topdressing and comprises a mixing tank, the mixing tank is fixedly arranged at the upper end of a movable frame, and a first partition plate and the bottom end in the mixing tank are combined to form a mixing chamber. The second partition plate divides the part between the upper end of the first partition plate and the upper end in the mixing tank into a clear water tank and a fertilizer water tank, the bottom end of the clear water tank is communicated with a valve body, a liquid discharging mechanism is arranged in the mixing chamber, a fertilizer adding mechanism is arranged at the bottom end of the fertilizer water tank, and a mixing mechanism is arranged in the mixing chamber. The interior of the mixing tank is divided into the mixing chamber, the clear water tank and the fertilizer water tank, liquid fertilizer can be conveniently and continuously sprayed, and the liquid fertilizer in the mixing chamber can be conveniently mixed and conveyed by arranging the mixing mechanism.

Description

Technical Field

[0001] This utility model relates to the field of topdressing technology for flue-cured tobacco, specifically a topdressing device for flue-cured tobacco that automatically controls fertilizer concentration. Background Technology

[0002] During the planting process of flue-cured tobacco, fertilization is necessary to promote the rapid growth of tobacco seedlings. There are various methods of fertilization, among which liquid fertilizer is a type of liquid fertilizer, which is made by mixing organic or chemical fertilizers with water and spraying it directly onto the leaves and roots of plants for rapid absorption. Liquid fertilizer mixing sprayers are agricultural equipment mainly used to evenly spray liquid fertilizers in farmland, providing sufficient nutrients for plants and promoting their growth and development.

[0003] Currently, the common method for topdressing flue-cured tobacco involves pre-mixing fertilizer and water in a large container, then pumping the fertilizer solution through a suction-type booster pump to the terminal nozzles for application. This method suffers from uneven fertilizer concentration, resulting in uneven tobacco plant growth; furthermore, once the fertilizer solution in the container is depleted, it needs to be remixed and prepared, making continuous application impossible and affecting the efficiency of topdressing.

[0004] Based on this, an automatic fertilizer concentration control device for topdressing flue-cured tobacco is now provided, which can eliminate the drawbacks of existing devices. Utility Model Content

[0005] The purpose of this invention is to provide an automatic fertilizer concentration control device for topdressing flue-cured tobacco, so as to solve the problem of inconvenience in continuous topdressing in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An automatic fertilizer concentration control device for topdressing flue-cured tobacco includes a mixing tank, which is fixedly mounted on the upper end of a movable frame. A first partition is fixedly installed inside the mixing tank, forming a mixing chamber with the bottom of the mixing tank. A second partition is provided between the upper end of the first partition and the upper end of the mixing tank, dividing the area between the upper end of the first partition and the upper end of the mixing tank into a clear water tank and a fertilizer tank. A first liquid addition pipe and a second liquid addition pipe are respectively connected to the upper end of the mixing tank at positions corresponding to the clear water tank and the fertilizer tank. A valve body is connected to the bottom of the clear water tank, and a valve core is slidably installed inside the valve body. A draining mechanism is provided inside the mixing chamber for automatically adding diluent from the clear water tank. A fertilizer addition mechanism is provided at the bottom of the fertilizer tank for automatically adding concentrated fertilizer solution to the mixing chamber. A mixing mechanism is provided inside the mixing chamber for mixing the diluent and the concentrated fertilizer solution.

[0008] Based on the above technical solutions, this utility model also provides the following optional technical solutions:

[0009] In one alternative: a pump body is fixedly mounted on the upper end of the mobile frame, the input end of the pump body is connected to the mixing chamber, the output end of the pump body is connected to an installation pipe, the installation pipe is fixedly mounted on one end of the mobile frame, and a plurality of spray heads are connected to the mobile frame.

[0010] In one alternative embodiment: the drainage mechanism includes a traction rope, one end of the valve core is fixedly connected to one end of the traction rope, the other end of the traction rope is fixedly mounted on one end of a sliding plate, the sliding plate is slidably mounted inside a fixed tube, the fixed tube is fixedly mounted inside a mixing chamber, the other end of the sliding plate is fixedly mounted on a sliding tube, a guide rod is sleeved inside the sliding tube, the guide rod is fixedly mounted on the bottom end inside the fixed tube, a first fixed plate is fixedly mounted on one end of the sliding tube, a return spring is provided between the bottom end of the first fixed plate and the bottom end inside the fixed tube, a floating ring is slidably mounted inside the mixing chamber, and the interior of the floating ring is a... The system is configured with an empty configuration. The floating ring is filled with a filling ring, and a counterweight ring is fixedly installed at the upper end of the floating ring. The floating ring, filling ring, and counterweight ring are all provided with notches at positions corresponding to the fixed tube. Extension plates are fixedly installed on both sides of the first fixed plate, and the extension plates extend to the outside of the fixed tube. A second magnet is fixedly installed at one end of each extension plate. A first magnet is provided at the bottom end of the mixing chamber at a position corresponding to the second magnet. The first magnet and the second magnet attract each other. A fixed ring is fixedly installed inside the mixing chamber at a position corresponding to the floating ring. A reset component is provided on the sliding plate to close the valve core to the liquid outlet end of the valve body.

[0011] In one alternative: the reset assembly includes a tension spring and a second fixing plate, one end of the valve core is fixedly connected to one end of several tension springs respectively, the other end of each tension spring is fixedly connected to one end of the valve body, and the second fixing plate is symmetrically provided on the sliding plate.

[0012] In one alternative embodiment: the fertilizer adding mechanism includes an electromagnetic valve, which is connected to the bottom of the fertilizer tank. The discharge end of the electromagnetic valve is connected to the interior of the mixing chamber. A conductivity sensor is installed at the bottom of the mixing chamber. Both the electromagnetic valve and the conductivity sensor are electrically connected to a control component, which is fixedly mounted on the upper end of the movable frame.

[0013] In one alternative embodiment: the mixing mechanism includes a mounting shaft, one end of which is rotatably mounted at the bottom of the mixing chamber, and the other end of which extends to the outside of the mixing tank. A spiral plate is provided on the mounting shaft at a position corresponding to the inside of the mixing chamber. A conveying pipe is closely attached to the outside of the spiral plate. The bottom end of the conveying pipe is rotatably mounted at the bottom of the mixing chamber. A drain pipe is symmetrically connected to the other end of the conveying pipe. Several stirring rods are arranged in a circular array on the outside of the conveying pipe. A sleeve shaft is fixedly mounted at the upper end of the conveying pipe. One end of the sleeve shaft extends to the outside of the mixing tank. A first bevel gear is fixedly mounted at one end of the mounting shaft, and a second bevel gear is fixedly mounted at one end of the sleeve shaft. Both the first and second bevel gears mesh with a third bevel gear. The third bevel gear is fixedly mounted on the output end of a motor. The motor is fixedly mounted at the upper end of the mixing tank.

[0014] In one alternative: the conveying pipe is symmetrically provided with support plates, each of the support plates is provided with mounting holes, each of the mounting holes is rotatably provided with a fixing column, the bottom end of the fixing column is fixed with a mixing disk, the bottom end of the mixing disk is provided with a plurality of mixing columns, and the other end of the fixing column is symmetrically provided with a guide plate.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This invention divides the mixing tank into a mixing chamber, a clear water tank, and a fertilizer tank, facilitating continuous spraying of liquid fertilizer. A drainage mechanism allows for the addition of diluent to the mixing chamber when the liquid fertilizer is nearly used up. This is achieved through the weight of the counterweight ring and the attraction between the first and second magnets, causing the valve core to slide. Simultaneously, a conductivity sensor continuously monitors the concentration of the liquid fertilizer within the mixing chamber, enabling the timely addition of concentrated fertilizer. The conductivity sensor utilizes existing components. The mixing mechanism facilitates the mixing and transport of the liquid fertilizer within the mixing chamber, with irregular discharge through the drain pipe, enhancing the mixing effect and increasing the practicality of the tobacco topdressing device. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model.

[0018] Figure 2 This is a schematic diagram of the internal structure of the mixing tank of this utility model.

[0019] Figure 3 This is a schematic diagram of the hybrid disk structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the installation of the conveying pipe of this utility model.

[0021] Figure 5 This is a schematic diagram of the valve core and tension spring structure of this utility model.

[0022] Figure 6 This is a schematic diagram showing the installation of the first and second magnets of this utility model.

[0023] Figure 7 This is a schematic diagram of the installation of the first fixing plate of this utility model.

[0024] Figure reference numerals: 11 Mixing tank, 12 First baffle, 13 Second baffle, 14 Mixing chamber, 15 Clean water tank, 16 First liquid addition pipe, 17 Fertilizer tank, 18 Second liquid addition pipe, 19 Solenoid valve, 20 Conductivity sensor, 21 Control component, 22 Valve body, 23 Valve core, 24 Tension spring, 25 Traction rope, 26 Sliding plate, 27 Fixing pipe, 28 First fixing plate, 29 Return spring, 30 Floating ring, 31 Filling ring, 32 First magnet, 33 Second magnet, 34 Counterweight ring, 35 Second fixing plate, 36 Mounting shaft, 37 Spiral plate, 38 Conveying pipe, 39 Drain pipe, 40 Sleeve shaft, 41 Motor, 42 Sealing pipe, 43 Mixing disc, 44 Moving frame, 45 Pump body, 46 Mounting pipe, 47 Spray head. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] In one embodiment, such as Figures 1-7 As shown, an automatic fertilizer concentration control device for topdressing flue-cured tobacco includes a mixing tank 11, which is fixedly mounted on the upper end of a movable frame 44. A first partition 12 is fixedly installed inside the mixing tank 11, forming a mixing chamber 14 with the bottom of the mixing tank 11. A second partition 13 is provided between the upper end of the first partition 12 and the upper end of the mixing tank 11, dividing the area between the upper end of the first partition 12 and the upper end of the mixing tank 11 into a clear water tank 15 and a fertilizer tank 17. A first liquid addition pipe 16 and a second liquid addition pipe 18 are respectively connected to the upper end of the mixing tank 11 at positions corresponding to the clear water tank 15 and the fertilizer tank 17. A valve body 2 is connected to the bottom of the clear water tank 15. 2. A valve core 23 is slidably provided inside the valve body 22. A draining mechanism is provided inside the mixing chamber 14 for automatically adding diluent from the clear water tank 15 into the mixing chamber 14. A fertilizer adding mechanism is provided at the bottom of the fertilizer tank 17 for automatically adding concentrated fertilizer into the mixing chamber 14. A mixing mechanism is provided inside the mixing chamber 14 for mixing the diluent and the concentrated fertilizer. The draining mechanism allows for the automatic addition of diluent to the mixing chamber 14 when the liquid fertilizer inside is about to run out. The fertilizer adding mechanism allows for the addition of concentrated fertilizer according to the concentration of the liquid fertilizer inside the mixing chamber 14 when adding diluent. The mixing mechanism facilitates the mixing of the diluent and the fertilizer.

[0027] A pump body 45 is fixedly installed on the upper end of the mobile frame 44. The input end of the pump body 45 is connected to the mixing chamber 14, and the output end of the pump body 45 is connected to an installation pipe 46. The installation pipe 46 is fixedly installed at one end of the mobile frame 44. Several spray heads 47 are connected to the mobile frame 44. When applying fertilizer to flue-cured tobacco, the pump body 45 draws liquid fertilizer from the mixing chamber 14 and delivers the liquid fertilizer to the installation pipe 46. The installation pipe 46 sprays the fertilizer out through the several spray heads 47.

[0028] The drainage mechanism includes a traction rope 25. One end of the valve core 23 is fixedly connected to one end of the traction rope 25. The other end of the traction rope 25 is fixedly mounted on one end of a sliding plate 26. The sliding plate 26 is slidably mounted inside a fixed tube 27. The fixed tube 27 is fixedly mounted inside a mixing chamber 14. A sliding tube is fixedly mounted on the other end of the sliding plate 26. A guide slide rod is sleeved inside the sliding tube. The guide slide rod is fixedly mounted at the bottom end of the fixed tube 27. A first fixed plate 28 is fixedly mounted on one end of the sliding tube. A return spring 29 is provided between the bottom end of the first fixed plate 28 and the bottom end of the fixed tube 27. A floating ring 30 is slidably mounted inside the mixing chamber 14. The floating ring 30 is hollow inside. The interior of ring 30 is filled with a filling ring 31. A counterweight ring 34 is fixedly provided at the upper end of the floating ring 30. Notches are provided at the positions of the floating ring 30, filling ring 31, and counterweight ring 34 corresponding to the positions of the fixed tube 27. Extension plates are fixedly provided on both sides of the first fixed plate 28. The extension plates extend to the outside of the fixed tube 27. A second magnet 33 is fixedly provided at one end of each extension plate. A first magnet 32 ​​is provided at the bottom of the mixing chamber 14 corresponding to the position of the second magnet 33. The first magnet 32 ​​and the second magnet 33 attract each other. A fixed ring is fixedly provided inside the mixing chamber 14 corresponding to the position of the floating ring 30. A reset component is provided on the sliding plate 26 for sealing the outlet end of the valve body 22 with the valve core 23.

[0029] The reset assembly includes a tension spring 24 and a second fixing plate 35. One end of the valve core 23 is fixedly connected to one end of several tension springs 24, and the other end of each tension spring 24 is fixedly connected to one end of the valve body 22. The sliding plate 26 is symmetrically provided with the second fixing plate 35. In use, when the liquid fertilizer in the mixing chamber 14 is about to be used up, the floating ring 30 always floats on the surface of the liquid fertilizer, causing the floating ring 30 to drive the first fixing plate 28 to slide inside the fixing tube 27 under the action of the counterweight ring 34. The first fixing plate 28 pulls the valve core 23 to slide through the sliding plate 26 and the traction rope 25. At the same time, the distance between the second magnet 33 and the first magnet 32 ​​gradually decreases. When the first magnet 32 ​​attracts the second magnet 33, one end of the tension spring 24 is unobstructed, allowing the diluted liquid inside the clear water tank 15 to enter the mixing chamber 14. As the liquid level inside the mixing chamber 14 increases, the floating ring 30 floats, and the first magnet 32 ​​attracts the second magnet 33, fixing the position of the first fixing plate 28 and thus fixing the valve core 23. As the liquid level increases, the upper end of the floating ring 30 is pressed tightly against the bottom end of the second fixing plate 35. When the second fixing plate 35 pushes the sliding plate 26 to slide, the first magnet 32 ​​and the second magnet 33 separate. Under the action of the tension spring 24, the valve core 23 seals the liquid outlet end of the tension spring 24.

[0030] The fertilizer application mechanism includes an electromagnetic valve 19, which is connected to the bottom of the fertilizer tank 17. The discharge end of the electromagnetic valve 19 is connected to the interior of the mixing chamber 14. A conductivity sensor 20 is installed at the bottom of the mixing chamber 14. Both the electromagnetic valve 19 and the conductivity sensor 20 are electrically connected to the control component 21, which is fixedly mounted on the upper end of the movable frame 44. During use, when topdressing is being performed, the conductivity sensor 20 continuously monitors the concentration of liquid fertilizer inside the mixing chamber 14. When the clear water tank 15 adds diluent to the mixing chamber 14, the conductivity sensor 20 detects the difference between the concentration of liquid fertilizer inside the mixing chamber 14 and the set standard, causing the control component 21 to control the process. The solenoid valve 19 is activated, allowing concentrated fertilizer solution from the fertilizer tank 17 to be added to the mixing chamber 14. When the clear water tank 15 stops adding diluent to the mixing chamber 14, and the conductivity sensor 20 detects that the concentration of liquid fertilizer in the mixing chamber 14 matches the set standard, the fertilizer tank 17 stops supplying concentrated fertilizer solution to the mixing chamber 14. It is worth noting that the solenoid valve 19, conductivity sensor 20, and control component 21 in this application all use existing components. When the conductivity sensor 20 is working, it infers the concentration of the liquid by measuring its conductivity. The detection end of the conductivity sensor 20 typically contains two electrodes. When the electrodes are immersed in the liquid, an electric field is formed. Ions in the solution move directionally under the influence of the electric field, generating a current. The conductivity sensor 20 measures the magnitude of this current. Based on the known relationship between conductivity and concentration, the concentration of the liquid can be determined. The conductivity sensor 20 transmits the detection information to the control component 21, which analyzes it and controls the opening and closing of the solenoid valve 19.

[0031] The mixing mechanism includes a mounting shaft 36, one end of which is rotatably mounted at the bottom of the mixing chamber 14, and the other end of which extends to the outside of the mixing tank 11. A spiral plate 37 is provided on the mounting shaft 36 at a position corresponding to the inside of the mixing chamber 14. A conveying pipe 38 is closely attached to the outside of the spiral plate 37. The bottom end of the conveying pipe 38 is rotatably mounted at the bottom of the mixing chamber 14, and the other end of the conveying pipe 38 is symmetrically connected to a drain pipe 39. A plurality of stirring rods are arranged in a circular array on the outside of the conveying pipe 38. A sleeve shaft 40 is fixedly mounted on the upper end of the conveying pipe 38, one end of which extends to the outside of the mixing tank 11. A first bevel gear is fixedly mounted on one end of the mounting shaft 36, and a second bevel gear is fixedly mounted on one end of the sleeve shaft 40. The first and second bevel gears mesh with a third bevel gear, which is fixedly mounted on the output end of the motor 41. The motor 41 is fixedly mounted on the upper end of the mixing tank 11. In use, when it is necessary to mix the liquid fertilizer inside the mixing chamber 14, the motor 41 is started. The output end of the motor 41 drives the third bevel gear to rotate. The third bevel gear meshes with the first and second bevel gears, thereby driving the mounting shaft 36 and the conveying pipe 38 to rotate in opposite directions. The mounting shaft 36 drives the spiral plate 37 to rotate. The spiral plate 37 cooperates with the conveying pipe 38 to convey the liquid fertilizer inside the mixing chamber 14 and discharge it through the drain pipe 39, so that the liquid fertilizer inside the mixing chamber 14 is circulated and mixed.

[0032] The conveying pipe 38 is symmetrically provided with support plates, each of which is provided with mounting holes. A fixed column is rotatably provided in each mounting hole. A mixing disc 43 is fixedly provided at the bottom of the fixed column. Several mixing columns are provided at the bottom of the mixing disc 43. A guide plate is symmetrically provided at the other end of the fixed column. In use, when the conveying pipe 38 drives the support plate to rotate, the resistance of the liquid fertilizer inside the mixing chamber 14 causes the guide plate to continuously drive the mixing disc 43 to rotate and adjust its direction. The mixing disc 43 rotates slightly on its own axis while revolving around the central axis, which facilitates the mixing of the liquid fertilizer at the bottom of the mixing chamber 14.

[0033] The above embodiment discloses an automatic fertilizer concentration control device for topdressing flue-cured tobacco. During topdressing, the pump 45 draws liquid fertilizer from the mixing chamber 14 and delivers it to the installation pipe 46. The installation pipe 46 sprays the fertilizer through several spray nozzles 47. When the liquid fertilizer in the mixing chamber 14 is about to be used up, the floating ring 30, which always floats on the surface of the liquid fertilizer, causes the first fixing plate 28 to slide inside the fixing pipe 27 under the action of the counterweight ring 34. The first fixing plate 28 pulls the valve core 23 to slide via the sliding plate 26 and the traction rope 25. Simultaneously, the distance between the second magnet 33 and the first magnet 32 ​​gradually decreases. When the second magnet 33 and the first magnet 32 ​​attract each other, one end of the tension spring 24 is unblocked, allowing the diluent from the clear water tank 15 to enter the mixing chamber 14. The conductivity sensor 20 continuously monitors the concentration of liquid fertilizer inside the mixing chamber 14. When the clear water tank 15 adds diluent to the mixing chamber 14, the conductivity sensor 20 detects the difference between the concentration of liquid fertilizer inside the mixing chamber 14 and the set standard. This causes the control component 21 to activate the solenoid valve 19, allowing the concentrated fertilizer solution inside the fertilizer tank 17 to be added to the mixing chamber 14 through the solenoid valve 19. Simultaneously, the output of the motor 41 drives the third bevel gear to rotate. The third bevel gear meshes with the first and second bevel gears, thereby driving the mounting shaft 36 and the conveying pipe 38 to rotate in opposite directions. The mounting shaft 36 drives the spiral plate 37 to rotate. The spiral plate 37 and the conveying pipe 38 work together to convey the liquid fertilizer inside the mixing chamber 14 and discharge it through the drain pipe 39, thus circulating and mixing the liquid fertilizer inside the mixing chamber 14.

[0034] As the liquid level inside the mixing chamber 14 increases, the floating ring 30 floats, and the first magnet 32 ​​and the second magnet 33 attract each other, fixing the position of the first fixing plate 28 and thus fixing the valve core 23. As the liquid level increases, the upper end of the floating ring 30 is pressed tightly against the bottom end of the second fixing plate 35. When the sliding plate 26 is pushed by the second fixing plate 35, the first magnet 32 ​​and the second magnet 33 separate. Under the action of the tension spring 24, the valve core 23 seals the liquid outlet end of the tension spring 24. When the clear water tank 15 stops adding diluent to the mixing chamber 14, and the conductivity sensor 20 detects that the liquid fertilizer concentration inside the mixing chamber 14 is consistent with the set standard, the fertilizer tank 17 stops delivering concentrated fertilizer solution to the mixing chamber 14.

[0035] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An automatic fertilizer concentration control device for topdressing flue-cured tobacco, comprising a mixing tank (11), the mixing tank (11) being fixedly mounted on the upper end of a movable frame (44), and a first partition (12) being fixedly provided inside the mixing tank (11), characterized in that, The first partition (12) and the bottom of the mixing tank (11) are combined to form a mixing chamber (14). A second partition (13) is provided between the upper end of the first partition (12) and the upper end of the mixing tank (11). The second partition (13) divides the upper end of the first partition (12) and the upper end of the mixing tank (11) into a clear water tank (15) and a fertilizer tank (17). The upper end of the mixing tank (11) is connected to the clear water tank (15) and the fertilizer tank (17) at corresponding positions, respectively, by a first liquid addition pipe (16) and a second liquid addition pipe (17). The two liquid addition pipes (18) are connected to the bottom of the clear water tank (15) and a valve body (22) is provided. A valve core (23) is slidably provided inside the valve body (22). The mixing chamber (14) is provided with a draining mechanism for automatically adding diluent from the clear water tank (15) to the mixing chamber (14). The bottom of the fertilizer tank (17) is provided with a fertilizer adding mechanism for automatically adding concentrated fertilizer to the mixing chamber (14). The mixing chamber (14) is provided with a mixing mechanism for mixing the diluent and the concentrated fertilizer.

2. The automatic fertilizer concentration control device for topdressing flue-cured tobacco according to claim 1, characterized in that, A pump body (45) is fixedly provided on the upper end of the mobile frame (44). The input end of the pump body (45) is connected to the mixing chamber (14). The output end of the pump body (45) is connected to an installation pipe (46). The installation pipe (46) is fixedly provided on one end of the mobile frame (44). Several spray heads (47) are connected on the mobile frame (44).

3. The automatic fertilizer concentration control device for topdressing flue-cured tobacco according to claim 1, characterized in that, The drainage mechanism includes a traction rope (25), one end of the valve core (23) is fixedly connected to one end of the traction rope (25), the other end of the traction rope (25) is fixedly mounted on one end of a sliding plate (26), the sliding plate (26) is slidably mounted inside a fixed tube (27), the fixed tube (27) is fixedly mounted inside a mixing chamber (14), the other end of the sliding plate (26) is fixedly mounted with a sliding tube, a guide slide rod is sleeved inside the sliding tube, the guide slide rod is fixedly mounted at the bottom end inside the fixed tube (27), one end of the sliding tube is fixedly mounted with a first fixed plate (28), a return spring (29) is provided between the bottom end of the first fixed plate (28) and the bottom end inside the fixed tube (27), a floating ring (30) is slidably mounted inside the mixing chamber (14), the floating ring (30) is hollow inside, the floating ring (30) is hollow inside, the floating ring (30) is hollow inside, the floating ring (30) is hollow inside the mixing chamber (14) is hollow inside the mixing chamber (14) 0) The interior is filled with a filling ring (31), and the upper end of the floating ring (30) is fixed with a counterweight ring (34). The floating ring (30), filling ring (31) and counterweight ring (34) are all provided with notches at the positions corresponding to the fixed tube (27). The first fixed plate (28) is fixed with extension plates on both sides. The extension plates extend to the outside of the fixed tube (27). The extension plates are fixed with a second magnet (33) at one end. The bottom of the mixing chamber (14) is provided with a first magnet (32) at the position corresponding to the second magnet (33). The first magnet (32) and the second magnet (33) attract each other. The interior of the mixing chamber (14) is fixed with a fixed ring at the position corresponding to the floating ring (30). The sliding plate (26) is provided with a reset component for the valve core (23) to close the liquid outlet end of the valve body (22).

4. The automatic fertilizer concentration control device for flue-cured tobacco topdressing according to claim 3, characterized in that, The reset assembly includes a tension spring (24) and a second fixing plate (35). One end of the valve core (23) is fixedly connected to one end of a plurality of tension springs (24), and the other end of each tension spring (24) is fixedly connected to one end of the valve body (22). The second fixing plate (35) is symmetrically provided on the sliding plate (26).

5. The automatic fertilizer concentration control device for topdressing flue-cured tobacco according to claim 4, characterized in that, The fertilizer feeding mechanism includes an electromagnetic valve (19), which is connected to the bottom of the fertilizer tank (17). The discharge end of the electromagnetic valve (19) is connected to the inside of the mixing chamber (14). A conductivity sensor (20) is installed at the bottom of the mixing chamber (14). Both the electromagnetic valve (19) and the conductivity sensor (20) are electrically connected to the control component (21), which is fixedly mounted on the upper end of the movable frame (44).

6. The automatic fertilizer concentration control device for topdressing flue-cured tobacco according to claim 1, characterized in that, The mixing mechanism includes a mounting shaft (36), one end of which is rotatably mounted at the bottom of the mixing chamber (14), and the other end of which extends to the outside of the mixing tank (11). A spiral plate (37) is provided on the mounting shaft (36) at a position corresponding to the inside of the mixing chamber (14). A conveying pipe (38) is closely attached to the outside of the spiral plate (37). The bottom end of the conveying pipe (38) is rotatably mounted at the bottom of the mixing chamber (14), and the other end of the conveying pipe (38) is symmetrically connected to a drain pipe (39). A plurality of stirring rods are arranged in a circular array on the outer side of the conveying pipe (38). A sleeve shaft (40) is fixedly provided at the upper end of the conveying pipe (38). One end of the sleeve shaft (40) extends to the outside of the mixing tank (11). A first bevel gear is fixedly provided at one end of the mounting shaft (36), and a second bevel gear is fixedly provided at one end of the sleeve shaft (40). Both the first bevel gear and the second bevel gear mesh with a third bevel gear. The third bevel gear is fixedly provided on the output end of the motor (41), and the motor (41) is fixedly provided on the upper end of the mixing tank (11).

7. The automatic fertilizer concentration control device for flue-cured tobacco topdressing according to claim 6, characterized in that, The conveying pipe (38) is symmetrically provided with support plates, each of which is provided with mounting holes. Each mounting hole is provided with a fixed column, and a mixing plate (43) is fixedly provided at the bottom of the fixed column. Several mixing columns are provided at the bottom of the mixing plate (43), and a guide plate is symmetrically provided at the other end of the fixed column.

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