Quantitative mixing device for compound fertilizer

Abstract

The utility model provides a compound fertilizer quantitative mixing device which comprises a tank body, a quantitative cylinder, a liquid supply cylinder and a telescopic piece, a discharging pipe is arranged at the bottom of the tank body, and a feeding pipe is arranged at the top of the tank body; the quantitative barrel is arranged at the top of the tank body, the bottom of the quantitative barrel is provided with a liquid inlet pipe located on the outer side of the tank body and a liquid outlet pipe extending into the tank body, an upper opening of the liquid inlet pipe is hinged to a one-way liquid inlet piece used for allowing liquid medicine to enter the quantitative barrel, and a lower opening of the liquid outlet pipe is slidably connected with a one-way liquid outlet piece used for allowing the liquid medicine to enter the tank body in the vertical direction; the liquid supply cylinder is arranged on one side of the quantitative cylinder, an opening of the liquid supply cylinder faces upwards, and a liquid discharge pipe communicated with the liquid inlet pipe is arranged at the bottom of the liquid supply cylinder; the telescopic piece is arranged at the top of the quantitative cylinder and extends downwards into the quantitative cylinder, and the lower end of the telescopic piece is connected with a piston which is in abutting fit with the inner peripheral wall of the quantitative cylinder. According to the quantitative mixing device for the compound fertilizer, provided by the utility model, random errors caused by manual addition are avoided, and quantitative addition of liquid medicine is realized.

Description

Technical Field

[0001] This utility model belongs to the field of compound fertilizer production technology, and more specifically, it relates to a compound fertilizer quantitative mixing device. Background Technology

[0002] Compound fertilizer is a type of chemical fertilizer containing multiple nutrients, typically composed of major nutrients such as nitrogen, phosphorus, and potassium, as well as trace elements. The preparation process of compound fertilizer involves mixing different proportions of basic nutrients to meet the needs of crop growth. However, the production of compound fertilizer also includes some chemical solutions containing nutrients, which are generally present in a lower proportion than the overall compound fertilizer, necessitating precise quantitative application during storage.

[0003] Traditional methods often rely on manual visual inspection or the use of simple flow meters to add chemical solutions. These methods are highly susceptible to variations in measurement due to the operator's experience and attention span, resulting in significant fluctuations and failing to achieve truly precise quantitative addition. Utility Model Content

[0004] This utility model provides a compound fertilizer quantitative mixing device. When the piston moves upward, a quantitative cylinder draws in a fixed volume of liquid fertilizer, and when it moves downward, it discharges an equal amount. This fundamentally avoids the random errors caused by manual addition and achieves quantitative addition of the liquid fertilizer.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A compound fertilizer quantitative mixing device is provided, comprising a tank, a metering cylinder, a liquid supply cylinder, and a telescopic component. The tank has a discharge pipe at the bottom and an inlet pipe at the top. The metering cylinder is located at the top of the tank, and its bottom has an inlet pipe located outside the tank and an outlet pipe extending into the tank. The upper opening of the inlet pipe is hinged with a one-way inlet component for supplying the liquid into the metering cylinder, and the lower opening of the outlet pipe is slidably connected in the vertical direction to a one-way outlet component for supplying the liquid into the tank. The device comprises: a supply cylinder located on one side of the metering cylinder with its opening facing upwards; a discharge pipe connected to the inlet pipe at the bottom of the supply cylinder; a telescopic component located at the top of the metering cylinder and extending downwards into the cylinder; and a piston connected at the lower end of the telescopic component that abuts against the inner circumferential wall of the metering cylinder. When the piston is in the upward position, the one-way inlet component opens under pressure to allow the liquid to enter the metering cylinder through the inlet pipe. When the piston is in the downward position, the one-way outlet component opens under pressure to allow the liquid to enter the tank through the outlet pipe.

[0006] In one possible implementation, the unidirectional liquid outlet component includes two guide rods, a sealing ball, and a tension spring. The two guide rods are disposed on the outer peripheral wall of the liquid outlet pipe and extend downward, and are symmetrically disposed on both sides of the liquid outlet pipe. The sealing ball is slidably connected to the guide rods in the vertical direction and is used to seal the lower opening of the liquid outlet pipe. The tension spring is sleeved on the outer periphery of the guide rods, with one end connected to the guide rod and the other end connected to the sealing ball, and is used to pull the sealing ball upward to seal the lower opening of the liquid outlet pipe.

[0007] In one possible implementation, the one-way liquid inlet component includes a mounting ring and a sealing plate. The mounting ring is disposed inside the liquid inlet pipe, and its outer peripheral wall edge is connected to the inner wall of the liquid inlet pipe. The mounting ring has an axially penetrating passage cavity. The sealing plate is rotatably connected to the top of the mounting ring via a rotating shaft and is used to block the passage cavity. The sealing plate can swing vertically under pressure to open the passage cavity.

[0008] In some embodiments, the top surface of the mounting ring is provided with a receiving groove for accommodating the sealing plate, and a sealing ring located on the outer periphery of the cavity is embedded on the bottom wall of the receiving groove. The sealing ring is used to abut against the sealing plate.

[0009] In some embodiments, a torsion spring is fitted on the shaft, with one end of the torsion spring connected to the sealing plate and the other end connected to the mounting ring.

[0010] In one possible implementation, the inlet pipe and the outlet pipe are connected by a flexible hose. The flexible hose is provided with two clamping components located near both ends of the hose. The clamping components are fitted around the outer periphery of the hose and are used to lock the hose to the outlet pipe or the inlet pipe.

[0011] In some embodiments, the clamping assembly includes a first clamping half-ring and a second clamping half-ring that are rotatably connected; the free end of the first clamping half-ring is provided with a first pressure plate extending radially along the first clamping half-ring; the free end of the second clamping half-ring is provided with a second pressure plate extending radially along the second clamping half-ring; the first pressure plate and the second pressure plate are connected by a locking assembly.

[0012] In some embodiments, the locking assembly includes a locking bolt disposed through the first pressure plate and the second pressure plate, and a locking block threadedly connected to an extension end of the locking bolt.

[0013] In some embodiments, the outer side of the second pressure plate is provided with a limiting groove for accommodating the bolt head of the locking bolt to limit the circumferential rotation of the locking bolt.

[0014] In one possible implementation, the top of the tank is provided with a stirring component extending into the tank body for stirring compound fertilizer. The stirring component includes a stirring shaft and stirring blades. The stirring shaft is rotatably connected to the top of the tank body and extends downward into the tank body. The upper end of the stirring shaft is connected to a rotary drive component. The stirring blades are connected to the outer peripheral wall of the stirring shaft and extend outward and downward.

[0015] The compound fertilizer quantitative mixing device provided in this embodiment, compared with the prior art, uses a telescopic component to drive the piston to move up and down inside the metering cylinder. Combined with the synergistic effect of the unidirectional inlet and outlet components, it achieves precise metering and dosing of the liquid. When the piston moves upward, the metering cylinder draws in a fixed volume of liquid, and when it moves downward, it discharges an equal amount, fundamentally avoiding random errors caused by manual addition and realizing quantitative addition of the liquid. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a frontal cross-sectional view of the compound fertilizer quantitative mixing device provided in an embodiment of the present utility model;

[0018] Figure 2 This is an embodiment of the present utility model. Figure 1 A magnified schematic diagram of the local structure at point I;

[0019] Figure 3 This is an embodiment of the present utility model. Figure 1 A frontal cross-sectional view of the unidirectional liquid inlet component;

[0020] Figure 4 This is an embodiment of the present utility model. Figure 1 Top view of the central sealing plate and torsion spring;

[0021] Figure 5 This is an embodiment of the present utility model. Figure 1 A top view of the mounting ring and sealing ring.

[0022] Figure 6 This is an embodiment of the present utility model. Figure 1 A frontal sectional view of the interlocking and locking components.

[0023] The following are the labeling elements in the figure:

[0024] 10. Tank body; 11. Discharge pipe; 12. Inlet pipe; 20. Metering cylinder; 21. Liquid inlet pipe; 22. Liquid outlet pipe; 23. Hose; 30. One-way liquid inlet component; 31. Mounting ring; 311. Through cavity; 312. Receiving tank; 313. Sealing ring; 32. Sealing plate; 33. Rotating shaft; 34. Torsion spring; 40. One-way liquid outlet component; 41. Guide rod; 42. Sealing ball; 43. Tension spring; 50. Liquid supply cylinder; 51. Liquid discharge pipe; 60. Telescopic component; 61. Piston; 70. Clamping assembly; 71. First clamping half ring; 72. First pressure plate; 73. Second clamping half ring; 74. Second pressure plate; 741. Limiting groove; 80. Locking assembly; 81. Locking bolt; 82. Locking block; 90. Stirring component; 91. Stirring shaft; 92. Rotary drive component; 93. Stirring blade. Detailed Implementation

[0025] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or indirectly on the other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a number" means two or more, unless otherwise explicitly specified.

[0027] Compound fertilizer is a type of chemical fertilizer containing multiple nutrients, typically composed of major nutrients such as nitrogen, phosphorus, and potassium, as well as trace elements. The preparation process of compound fertilizer involves mixing different proportions of basic nutrients to meet the needs of crop growth. However, the production of compound fertilizer also includes some chemical solutions containing nutrients, which are generally present in a lower proportion than the overall compound fertilizer, necessitating precise quantitative application during storage.

[0028] Traditional methods often rely on manual visual inspection or the use of simple flow meters to add chemical solutions. These methods are highly susceptible to variations in measurement due to the operator's experience and attention span, resulting in significant fluctuations and failing to achieve truly precise quantitative addition.

[0029] Please see Figures 1 to 6 The compound fertilizer quantitative mixing device provided by this utility model will now be described. The compound fertilizer quantitative mixing device includes a tank 10, a metering cylinder 20, a liquid supply cylinder 50, and a telescopic component 60. The tank 10 has a discharge pipe 11 at the bottom and an inlet pipe 12 at the top. The metering cylinder 20 is located at the top of the tank 10. The bottom of the metering cylinder 20 has an inlet pipe 21 located outside the tank 10 and an outlet pipe 22 extending into the tank 10. The upper opening of the inlet pipe 21 is hinged with a one-way inlet component 30 for supplying liquid into the metering cylinder 20, and the lower opening of the outlet pipe 22 is slidably connected in the vertical direction to a one-way outlet component 40 for supplying liquid into the tank 10. The liquid supply cylinder 50 is located at the top of the tank 10. The liquid supply cylinder 50 is located on one side with its opening facing upwards. The bottom of the liquid supply cylinder 50 is provided with a liquid discharge pipe 51 that communicates with the liquid inlet pipe 21. The telescopic component 60 is located at the top of the metering cylinder 20 and extends downwards into the metering cylinder 20. The lower end of the telescopic component 60 is connected to a piston 61 that abuts against the inner circumferential wall of the metering cylinder 20. When the piston 61 is in the upward position, the one-way liquid inlet component 30 opens under pressure to allow the liquid medicine to enter the metering cylinder 20 through the liquid inlet pipe 21. When the piston 61 is in the downward position, the one-way liquid outlet component 40 opens under pressure to allow the liquid medicine to enter the tank 10 through the liquid outlet pipe 22.

[0030] Furthermore, the telescopic component 60 has a telescopic rod that penetrates the top wall of the metering cylinder 20, and the piston 61 is connected to the lower end of the telescopic rod.

[0031] Furthermore, a valve is provided on the discharge pipe 11.

[0032] Furthermore, the outer peripheral wall of the metering cylinder 20 is provided with several graduation lines along the vertical direction.

[0033] Before using this device, the amount of liquid medicine to be drawn into the metering cylinder 20 should be calculated based on the upward stroke of the piston 61 or the telescopic rod, i.e., how much liquid medicine is needed. The telescopic component 60 drives the piston 61 to move upward by the corresponding distance.

[0034] This application provides a compound fertilizer quantitative mixing device. In actual use, the required liquid is first added to the supply cylinder 50. In the initial state, the piston 61 is attached to the inner bottom wall of the metering cylinder 20. When liquid needs to be added to the tank 10, the telescopic component 60 is activated to drive the piston 61 to move upward to a predetermined position (the amount of liquid to be drawn into the metering cylinder 20 is calculated in advance based on the upward stroke of the piston 61). At this time, the pressure in the supply cylinder 50 is greater than the pressure in the metering cylinder 20, and the one-way inlet 30 opens under pressure, drawing the liquid in the supply cylinder 50 into the metering cylinder 20 (at this time, the amount of liquid in the metering cylinder 20 is the amount to be added to the tank 10). After the suction is completed, the one-way inlet 30 automatically closes. Then, the telescopic component 60 drives the piston 61 to move downward. At this time, the pressure in the metering cylinder 20 is greater than the pressure in the tank 10, and the one-way outlet 40 opens under pressure so that the liquid in the metering cylinder 20 enters the tank 10 through the outlet pipe 22.

[0035] The piston 61 is driven by the telescopic component 60 to move up and down inside the metering cylinder 20. Combined with the synergistic effect of the one-way inlet component 30 and the one-way outlet component 40, precise metering and dosing of the medicine solution is achieved. When the piston 61 moves upward, the metering cylinder 20 draws in a fixed volume of medicine solution, and when it moves downward, it discharges an equal amount, fundamentally avoiding random errors caused by manual addition and realizing quantitative addition of the medicine solution.

[0036] The compound fertilizer quantitative mixing device provided in this embodiment, compared with the prior art, uses the telescopic component 60 to drive the piston 61 to move up and down inside the metering cylinder 20. Combined with the synergistic effect of the one-way liquid inlet component 30 and the one-way liquid outlet component 40, it achieves precise metering and dosing of the liquid. When the piston 61 moves upward, the metering cylinder 20 draws in a fixed volume of liquid, and when it moves downward, it discharges an equal amount, fundamentally avoiding random errors caused by manual addition and realizing quantitative addition of the liquid.

[0037] In one possible implementation, the aforementioned one-way liquid outlet 40 adopts as follows: Figure 1 and Figure 2 The structure shown is described in the following document. Figure 1 and Figure 2 The one-way liquid outlet component 40 includes two guide rods 41, a sealing ball 42, and a tension spring 43. The two guide rods 41 are disposed on the outer peripheral wall of the liquid outlet pipe 22 and extend downward. The two guide rods 41 are symmetrically disposed on both sides of the liquid outlet pipe 22. The sealing ball 42 is slidably connected to the guide rods 41 in the vertical direction and is used to block the lower opening of the liquid outlet pipe 22. The tension spring 43 is sleeved on the outer periphery of the guide rods 41. One end of the tension spring 43 is connected to the guide rods 41, and the other end is connected to the sealing ball 42. It is used to pull the sealing ball 42 upward to block the lower opening of the liquid outlet pipe 22.

[0038] Specifically, the symmetrically arranged double guide rods 41 ensure that the sealing ball 42 rises and falls vertically without deviation, avoiding jamming or poor sealing caused by single-point guidance. The tension spring 43 continuously provides an upward sealing force, making the sealing ball 42 fit tightly against the lower opening of the liquid outlet pipe 22. This not only prevents the compound fertilizer slurry in the tank 10 from flowing back into the metering cylinder 20, but also ensures that when the piston 61 moves upward, the pressure in the metering cylinder 20 is not affected by the sealing problem at the lower opening of the liquid outlet pipe 22, allowing the liquid to be normally drawn into the metering cylinder 20 from the supply cylinder 50.

[0039] The elastic compensation characteristics of tension spring 43 can adapt to changes in the viscosity of the liquid or the influence of minor impurities. It can still quickly reset the seal when pressure fluctuates, making it more stable and reliable than gravity-dependent seals.

[0040] In one possible implementation, the aforementioned one-way liquid inlet element 30 adopts as follows: Figures 1 to 5 The structure shown is described in the following document. Figures 1 to 5 The one-way liquid inlet component 30 includes a mounting ring 31 and a sealing plate 32. The mounting ring 31 is disposed inside the liquid inlet pipe 21 and its outer peripheral wall edge is connected to the inner wall of the liquid inlet pipe 21. The mounting ring 31 has an axially penetrating passage cavity 311. The sealing plate 32 is rotatably connected to the top of the mounting ring 31 via a rotating shaft 33 and is used to block the passage cavity 311. The sealing plate 32 can swing vertically under pressure to open the passage cavity 311.

[0041] Specifically, the sealing plate 32 can swing upwards, and the rotating shaft 33 type sealing plate 32 can quickly swing vertically to open under the pressure of the liquid medicine. It has a large flow cross-sectional area and low pressure loss, ensuring that the liquid medicine efficiently fills the metering cylinder 20 when the piston 61 moves upwards.

[0042] The sealing plate 32 automatically resets by its own weight and forms a surface contact seal with the passage cavity 311 of the mounting ring 31, which has low requirements for installation accuracy.

[0043] The sealing plate 32 and the mounting ring 31 are separate structures, which can be replaced independently when damaged, without the need to disassemble the inlet pipe 21 as a whole.

[0044] In some embodiments, see Figure 3 and Figure 5 The top surface of the mounting ring 31 is provided with a receiving groove 312 for accommodating the sealing plate 32. A sealing ring 313 located on the outer periphery of the passage cavity 311 is embedded on the bottom wall of the receiving groove 312. The sealing ring 313 is used to abut against the sealing plate 32.

[0045] Specifically, an annular sealing groove is provided on the inner bottom wall of the receiving groove 312, and the sealing ring 313 is located in the annular sealing groove. When the sealing plate 32 is in the closed state, the side wall of the sealing plate 32 near the mounting ring 31 is in close contact with the sealing ring 313, thereby improving the sealing performance.

[0046] The sealing ring 313 embedded in the receiving groove 312 forms a double sealing interface with the sealing plate 32. Even if the sealing plate 32 has a small gap due to wear, the sealing ring 313 can still prevent the leakage of medicine.

[0047] In some embodiments, see Figure 3 and Figure 4 A torsion spring 34 is fitted on the rotating shaft 33. One end of the torsion spring 34 is connected to the sealing plate 32, and the other end is connected to the mounting ring 31.

[0048] Specifically, the torsion spring 34 can ensure that the sealing plate 32 and the mounting ring 31 fit tightly when the sealing plate 32 is closed, thereby ensuring sealing and preventing the liquid from entering the metering cylinder 20 from the supply cylinder 50 when the piston 61 is not moving upward.

[0049] The torsion spring 34 provides additional closing force to the sealing plate 32, enabling it to quickly reset after the piston 61 finishes drawing liquid upwards, eliminating the delay phenomenon of traditional gravity-operated valve closure and preventing backflow of the liquid in the metering cylinder 20.

[0050] In one possible implementation, the aforementioned inlet pipe 21 and outlet pipe 51 are arranged as follows: Figure 1 , Figure 2 and Figure 6 The structure shown is described in the following document. Figure 1 , Figure 2 and Figure 6 The inlet pipe 21 and the outlet pipe 51 are connected by a hose 23. The hose 23 is provided with two clamping components 70 that are close to both ends of the hose 23. The clamping components 70 are sleeved on the outer periphery of the hose 23 and are used to lock the hose 23 to the outlet pipe 51 or the inlet pipe 21.

[0051] Specifically, the hose 23 connection allows the liquid supply cylinder 50 and the metering cylinder 20 to be installed and positioned independently, and the pipeline can be quickly installed and disassembled through the clamping assembly 70, which is convenient for changing the type of medicine or cleaning the pipeline.

[0052] Furthermore, a valve is provided on the drain pipe 51.

[0053] In some embodiments, see Figure 1 , Figure 2 and Figure 6 The clamping assembly 70 includes a first clamping half-ring 71 and a second clamping half-ring 73 that are rotatably connected; the free end of the first clamping half-ring 71 is provided with a first pressure plate 72 that extends radially along the first clamping half-ring 71; the free end of the second clamping half-ring 73 is provided with a second pressure plate 74 that extends radially along the second clamping half-ring 73; the first pressure plate 72 and the second pressure plate 74 are connected by a locking assembly 80.

[0054] Specifically, the first clamping half-ring 71 and the second clamping half-ring 73 are rotatably connected, so that the first clamping half-ring 71 and the second clamping half-ring 73 can be opened or closed. The clamping assembly 70 is sleeved on the discharge pipe 51 or the inlet pipe 21 connected to the hose 23. Then, the first pressure plate 72 and the second pressure plate 74 are fixed by the locking assembly 80, thereby fixing the hose 23 to the discharge pipe 51 or the inlet pipe 21.

[0055] The symmetrical closed structure of the first clamping semi-ring 71 and the second clamping semi-ring 73 ensures that the hose 23 is subjected to uniform force in the circumference, eliminating deformation or cracking caused by local stress concentration.

[0056] In some embodiments, see Figure 1 , Figure 2 and Figure 6 The locking assembly 80 includes a locking bolt 81 disposed through the first pressure plate 72 and the second pressure plate 74, and a locking block 82 threadedly connected to the extension end of the locking bolt 81.

[0057] Specifically, the first pressure plate 72 and the second pressure plate 74 are located between the bolt head of the locking block 82 and the locking bolt 81. The locking block 82 and the locking bolt 81 are connected by threads and tightened, so that the first pressure plate 72 and the second pressure plate 74 gradually move closer together, thereby fixing the hose 23 to the discharge pipe 51 or the inlet pipe 21.

[0058] In some embodiments, see Figure 6 The outer side of the second pressure plate 74 is provided with a limiting groove 741 for accommodating the bolt head of the locking bolt 81 to limit the circumferential rotation of the locking bolt 81.

[0059] Specifically, the locking assembly 80 uses a locking bolt 81 and a locking block 82 to cooperate, and combines the limiting groove 741 to circumferentially lock the bolt head. During operation, only a single wrench is needed to tighten the locking block 82, without the need for auxiliary tools to fix the bolt, which greatly improves loading and unloading efficiency.

[0060] Furthermore, the locking block 82 is provided with a threaded hole that mates with the locking bolt 81, and the locking block 82 is provided with an observation hole that communicates with the outer end of the threaded hole and extends radially through the threaded hole.

[0061] Furthermore, the inner walls of the first and second cooperating semi-rings 71 and 73 are respectively provided with flexible pads for abutting against the outer wall of the hose 23.

[0062] In one possible implementation, the aforementioned tank 10 adopts the following... Figure 1 The structure shown is described in the following document. Figure 1The top of the tank 10 is provided with a stirring component 90 extending into the tank 10 and used for stirring compound fertilizer. The stirring component 90 includes a stirring shaft 91 and stirring blades 93. The stirring shaft 91 is rotatably connected to the top of the tank 10 and extends downward into the tank 10. A rotary drive component 92 is connected to the upper end of the stirring shaft 91. The stirring blades 93 are connected to the outer peripheral wall of the stirring shaft 91 and extend outward and downward.

[0063] Specifically, the outward and downward extension of the stirring blade 93 pushes the sediment at the bottom of the tank upward during rotation, forming a three-dimensional turbulent mixing with the liquid medicine, solving the problem of "liquid fertilizer stratification" in traditional stirrers and improving the uniformity of mixing.

[0064] The stirring shaft 91 is directly driven by the top rotating drive 92, which reduces shaft wear compared to side-mounted stirring and can process larger batches of materials with the same power.

[0065] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A compound fertilizer quantitative mixing device, characterized in that, include: The tank body has a discharge pipe at the bottom and a feed pipe at the top; A metering cylinder is disposed on the top of the tank body. The bottom of the metering cylinder has an inlet pipe located outside the tank body and an outlet pipe extending into the tank body. The upper opening of the inlet pipe is hinged with a one-way inlet component for supplying liquid medicine into the metering cylinder, and the lower opening of the outlet pipe is slidably connected with a one-way outlet component for supplying liquid medicine into the tank body in the up-down direction. A liquid supply cylinder is disposed on one side of the metering cylinder with its opening facing upwards, and a liquid discharge pipe connected to the liquid inlet pipe is provided at the bottom of the liquid supply cylinder. as well as A telescopic component is provided at the top of the metering cylinder and extends downward into the metering cylinder. The lower end of the telescopic component is connected to a piston that abuts against the inner circumferential wall of the metering cylinder. Specifically, when the piston is in the upward position, the one-way inlet opens under pressure to allow the liquid medicine to enter the metering cylinder through the inlet pipe; when the piston is in the downward position, the one-way outlet opens under pressure to allow the liquid medicine to enter the tank through the outlet pipe.

2. The compound fertilizer quantitative mixing device as described in claim 1, characterized in that, The one-way liquid outlet component includes: Two guide rods are disposed on the outer peripheral wall of the liquid outlet pipe and extend downward, and the two guide rods are symmetrically disposed on both sides of the liquid outlet pipe; A blocking ball, slidably connected to the guide rod in the vertical direction, is used to block the lower opening of the liquid outlet pipe; and A tension spring is sleeved on the outer periphery of the guide rod. One end of the tension spring is connected to the guide rod, and the other end is connected to the sealing ball. It is used to pull the sealing ball up to block the lower opening of the liquid outlet pipe.

3. The compound fertilizer quantitative mixing device as described in claim 1, characterized in that, The one-way liquid inlet component includes: A mounting ring, disposed within the inlet pipe, with its outer peripheral wall edge connected to the inner wall of the inlet pipe, and the mounting ring having an axially penetrating passage cavity; and A sealing plate is rotatably connected to the top of the mounting ring via a rotating shaft and is used to block the passage cavity. The sealing plate can swing vertically under pressure to open the passage cavity.

4. The compound fertilizer quantitative mixing device as described in claim 3, characterized in that, The top surface of the mounting ring is provided with a receiving groove for accommodating the sealing plate. A sealing ring located on the outer periphery of the passage cavity is embedded on the bottom wall of the receiving groove. The sealing ring is used to abut against the sealing plate.

5. The compound fertilizer quantitative mixing device as described in claim 3, characterized in that, A torsion spring is fitted on the rotating shaft, with one end of the torsion spring connected to the sealing plate and the other end connected to the mounting ring.

6. The compound fertilizer quantitative mixing device as described in claim 1, characterized in that, The inlet pipe and the outlet pipe are connected by a flexible tube. The flexible tube is provided with two clamping components that are respectively close to both ends of the flexible tube. The clamping components are sleeved on the outer periphery of the flexible tube and are used to lock the flexible tube to the outlet pipe or the inlet pipe.

7. The compound fertilizer quantitative mixing device as described in claim 6, characterized in that, The clamping assembly includes a first clamping half-ring and a second clamping half-ring that are rotatably connected; the free end of the first clamping half-ring is provided with a first pressure plate extending radially along the first clamping half-ring; the free end of the second clamping half-ring is provided with a second pressure plate extending radially along the second clamping half-ring; the first pressure plate and the second pressure plate are connected by a locking assembly.

8. The compound fertilizer quantitative mixing device as described in claim 7, characterized in that, The locking assembly includes a locking bolt disposed through the first pressure plate and the second pressure plate, and a locking block threadedly connected to the extension end of the locking bolt.

9. The compound fertilizer quantitative mixing device as described in claim 8, characterized in that, The outer side of the second pressure plate is provided with a limiting groove for accommodating the bolt head of the locking bolt to limit the circumferential rotation of the locking bolt.

10. The compound fertilizer quantitative mixing device as described in claim 1, characterized in that, The top of the tank is provided with a stirring component extending into the tank body for stirring the compound fertilizer, the stirring component comprising: A stirring shaft is rotatably connected to the top of the tank and extends downward into the tank body; a rotary drive component is connected to the upper end of the stirring shaft. The stirring blade is connected to the outer peripheral wall of the stirring shaft and extends outward and downward.

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