A fertilizer mixing tank

Abstract

This utility model discloses a fertilizer mixing tank, including a tank body connected to an inlet pipe and an outlet pipe, both of which extend into the interior of the tank body. The inlet pipe is connected to an external feeding device, and the outlet pipe is connected to an external receiving device. Inside the tank body, a shearing mixing blade, a dispersing mixing blade, and a wall-scraping mixing blade are arranged sequentially from bottom to top, and are coaxial. A drive assembly is provided on the tank body, which is kinetically connected to the shearing mixing blade, the dispersing mixing blade, and the wall-scraping mixing blade, driving the shearing mixing blade and the dispersing mixing blade to rotate relative to each other in opposite directions, while the wall-scraping mixing blade rotates in the opposite direction to the shearing mixing blade. Several jet nozzles are provided on the inner wall of the tank body, extending outside the tank body and connecting to an external fertilizer base liquid storage tank. The nozzle orifices form a reverse tangent angle with the rotation direction of the mixing blades. This utility model can improve the mixing uniformity of liquid fertilizers and meet the mixing requirements of high-solids-content fertilizers.

Description

Technical Field

[0001] This utility model relates to the field of fertilizer mixing tank technology, and in particular to a fertilizer mixing tank. Background Technology

[0002] A fertilizer mixing tank is a device used to uniformly mix various solid or liquid fertilizers. It typically consists of a tank body, a mixing device, a drive system, and inlet / outlet structures. Suitable for the preparation of organic fertilizers, compound fertilizers, or liquid fertilizers, it features simple operation, high efficiency, and easy cleaning, and is widely used in agriculture, horticulture, and large-scale fertilizer production.

[0003] Existing mixing devices, when mixing liquid fertilizers with high solid content, often suffer from poor fluidity due to excessively high viscosity and suspension rate. Ordinary mixing devices also lack sufficient shear force to disperse particles, resulting in poor mixing uniformity of the liquid fertilizer.

[0004] Therefore, it is urgent to research and develop a fertilizer mixing tank to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a fertilizer mixing tank that can improve the mixing uniformity of liquid fertilizers and meet the mixing requirements of fertilizers with high solid content.

[0006] To achieve the above objectives, this utility model provides a fertilizer mixing tank, the specific implementation of which is as follows:

[0007] A fertilizer mixing tank includes a tank body, the tank body being connected to an inlet pipe and an outlet pipe, both of which are internal to the tank body. The inlet pipe is connected to an external feeding device, and the outlet pipe is connected to an external receiving device.

[0008] The tank is equipped with a shearing agitator, a dispersing agitator, and a wall-scraping agitator arranged sequentially from bottom to top, and the shearing agitator, the dispersing agitator, and the wall-scraping agitator are coaxial.

[0009] The tank is equipped with a drive assembly, which is connected to the shearing agitator, the dispersing agitator, and the wall scraping agitator. The drive assembly drives the shearing agitator and the dispersing agitator to rotate relative to each other in opposite directions, and the wall scraping agitator to rotate in the opposite direction to the rotation of the shearing agitator.

[0010] The inner wall of the tank is provided with several jet nozzles, which extend to the outside of the tank and connect to the outer fertilizer base liquid storage tank. The nozzle orifice forms a reverse tangent with the rotation direction of the stirring paddle.

[0011] This utility model discloses a fertilizer mixing tank. Compared with the prior art, it features a shearing agitator, a dispersing agitator, and a wall-scraping agitator arranged sequentially from bottom to top inside the tank. A drive assembly on the tank is connected to each of these agitators, driving them to rotate in the opposite direction to the shearing agitator. The wall-scraping agitator rotates in the opposite direction to the shearing agitator. In conjunction with several jet nozzles on the inner wall of the tank, the liquid fertilizer is simultaneously agitated by the shearing agitator, the dispersing agitator, and the wall-scraping agitator during actual use. The shearing agitator at the bottom shears and breaks down large particles, the dispersing agitator in the middle disperses micron-sized agglomerates, and the wall-scraping agitator at the top removes deposits from the inner wall of the tank. The jet nozzles inject fertilizer base liquid into the liquid fertilizer at a counter-angle, creating micro-turbulence that improves the uniformity of mixing, thereby achieving uniform mixing of high-solids-content liquid fertilizer.

[0012] In some embodiments, the shearing agitator includes a first agitator shaft and a plurality of shearing teeth disposed on the outer wall of the first agitator shaft. The first agitator shaft extends vertically through the tank body to below the bottom of the tank body. The drive assembly is provided with a first motor at the bottom of the tank body. The first motor is drively connected to the first agitator shaft.

[0013] By setting the shearing agitator as the first agitator shaft and a number of shearing serrations on the first agitator shaft, the first agitator shaft extends vertically through the tank body to the bottom of the tank body and is connected to the first motor of the drive assembly located at the bottom of the tank body, thereby driving the operation of the shearing agitator.

[0014] In some embodiments, micropores are provided on the shearing saw teeth, and an air tube is provided inside the shearing saw teeth. One end of the air tube covers the micropores, and the other end extends through the hollow part of the first stirring shaft to the outside of the tank and is connected to a nitrogen gas source.

[0015] By setting micropores on the shearing saw teeth, and connecting the micropores to a nitrogen gas source outside the tank through a gas pipe set inside the shearing saw teeth, the nitrogen gas supply causes the micropores to generate nitrogen microbubbles during the rotation of the shearing saw teeth, which disturbs the liquid-solid interface of the liquid fertilizer and improves the dispersion efficiency of the granular agglomerates.

[0016] In some embodiments, the dispersing impeller includes a second stirring shaft and a plurality of turbine blades disposed on the second stirring shaft. The second stirring shaft is sleeved on the first stirring shaft, and the top of the second stirring shaft extends vertically through the tank to the top of the tank. The drive assembly includes a second motor fixed to the top of the tank. The second motor is drively connected to the second stirring shaft, driving the second stirring shaft to rotate relative to the first stirring shaft in opposite directions.

[0017] By setting the dispersing impeller as the second stirring shaft and several turbine blades set on the second stirring shaft, the second stirring shaft is sleeved on the first stirring shaft to achieve the coaxial setting of the two. The top of the second stirring shaft extends vertically through the tank body to the top of the tank body and is connected to the second motor of the drive assembly set on the top of the tank body, so that the second stirring shaft and the first stirring shaft can rotate relative to each other in opposite directions.

[0018] In some embodiments, the turbine blade has a plurality of openings that penetrate the turbine blade.

[0019] By setting several openings through the turbine blades, cavitation bubbles are generated in the openings when the turbine blades rotate, providing micro-scale shear force to the turbine blades and improving the dispersion effect of the dispersing impeller.

[0020] In some embodiments, the wall-scraping agitator includes a third agitation shaft and a plurality of scrapers disposed on the third agitation shaft. The scrapers are made of polytetrafluoroethylene or have a polytetrafluoroethylene layer covering their outer peripheral walls. The third agitation shaft is drive-connected to the second agitation shaft, and the distance between the scrapers and the inner wall of the tank is ≤1mm.

[0021] By setting the wall-scraping agitator as the third agitator and several scrapers on the third agitator, and making the scrapers PTFE or covering the scrapers with a PTFE layer, the high temperature resistance and low friction coefficient of PTFE material are utilized to improve the service life of the scrapers and the smoothness of the scrapers in cleaning the deposits on the tank wall. The third agitator and the second agitator are connected by a drive to achieve synchronous rotation with the second agitator, thereby enabling the wall-scraping agitator and the shearing agitator to rotate relative to each other in opposite directions.

[0022] In some embodiments, the second stirring shaft is provided with a transmission block and a transmission groove; or the second stirring shaft is provided with a transmission groove and a transmission block, wherein the transmission block is inserted into the transmission groove.

[0023] The transmission connection between the second and third stirring shafts is achieved by using a structure in which the transmission block and transmission groove are plugged together, thus realizing the convenience and stability of the transmission connection between the two.

[0024] In some embodiments, the tank wall is provided with a heat transfer oil channel and a cooling water channel, which are isolated from each other. The heat transfer oil channel is connected to an external heater through a pipe, and the cooling water channel is connected to an external cooling tower through a pipe.

[0025] By setting up mutually isolated heat transfer oil channels and cooling water channels inside the tank wall, the heat transfer oil channels are connected to external heaters, and the cooling water channels are connected to external cooling towers. The viscosity of the liquid fertilizer is reduced by heating through the heat transfer oil channels, and overheating is prevented by cooling through the cooling water channels.

[0026] In some embodiments, the tank is provided with three layers of ultrasonic concentration probes distributed circumferentially along the inner circumferential wall of the tank, and all the ultrasonic concentration probes are electrically connected to the control valve and drive assembly of the jet nozzle.

[0027] By installing three layers of ultrasonic concentration probes distributed circumferentially along the inner perimeter of the tank, and electrically connecting all ultrasonic concentration probes to the control valve and drive assembly of the jet nozzle, the concentration inside the tank can be comprehensively detected using the three layers of ultrasonic concentration probes. This allows the jet nozzle to provide quantitative compensation when the concentration is insufficient, and also controls the drive assembly to operate the shearing agitator, dispersing agitator, and wall scraping agitator to solve the problem of excessive local concentration, thus achieving the effect of automatically correcting concentration deviation.

[0028] In some embodiments, the bottom of the tank is conical, and a plurality of flow guide baffles are provided inside the conical portion. The flow guide baffles are detachably connected to the tank, and all the flow guide baffles cooperate to form a spiral flow guide area.

[0029] By setting the bottom of the tank in a conical shape and installing several flow guide baffles inside the conical part, the flow direction of the liquid fertilizer is guided by the conical structure. Furthermore, the spiral flow guide area formed by the cooperation of all the flow guide baffles is used to disrupt and destroy the flow vortex, increase the mixing in the radial direction, reduce the stirring blind zone, and improve the stirring effect.

[0030] Based on the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0031] By arranging a shearing agitator, a dispersing agitator, and a wall-scraping agitator sequentially from bottom to top inside the tank, and driving components on the tank to drive these agitators, the wall-scraping agitator rotates in the opposite direction to the shearing agitator. In conjunction with several jet nozzles on the inner wall of the tank, the liquid fertilizer is simultaneously agitated by these agitators during actual use. The bottom shearing agitator shears and breaks down large particles, the middle dispersing agitator disperses micron-sized agglomerates, and the top wall-scraping agitator removes deposits from the inner wall of the tank. The jet nozzles inject fertilizer base liquid at a counter-angular angle into the liquid fertilizer, creating micro-turbulence that enhances the uniformity of mixing, thus achieving uniform mixing of high-solids-content liquid fertilizers. This invention can meet the mixing requirements of liquid fertilizers with a solids content of up to 50%, achieving uniform mixing and preventing stratification. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the structure of this utility model;

[0033] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0034] Explanation of reference numerals in the attached figures:

[0035] 100. Tank body; 110. Feed pipe; 120. Discharge pipe; 130. Baffle; 140. Ultrasonic concentration probe; 150. Jet nozzle; 160. Heat transfer oil channel; 170. Cooling water channel; 200. Shearing agitator; 210. First agitator shaft; 220. Shearing serrations; 230. Micropores; 240. Transmission block; 300. Dispersion agitator; 310. Second agitator shaft; 320. Turbine blade; 330. Opening; 400. Wall scraping agitator; 410. Third agitator shaft; 420. Scraper; 510. First motor; 520. Second motor. Detailed Implementation

[0036] To facilitate understanding of this utility model, the specific embodiments of this utility model will be described in more detail below with reference to the accompanying drawings.

[0037] Unless otherwise specified or defined, the terms "first," "second," etc., used in this document are for distinguishing names only and do not represent a specific number or order.

[0038] Unless otherwise stated or defined, the term “and / or” as used herein includes any and all combinations of one or more of the associated listed items.

[0039] It should be noted that in this article, "fixed to" or "connected to" can mean directly fixed to or connected to a component, or indirectly fixed to or connected to a component.

[0040] like Figure 1-2 As shown, the fertilizer mixing tank provided in this embodiment includes a tank body 100. The tank body 100 is connected to an inlet pipe 110 and an outlet pipe 120. Both the inlet pipe 110 and the outlet pipe 120 are connected to the inside of the tank body 100. The inlet pipe 110 is connected to an external feeding device, and the outlet pipe 120 is connected to an external receiving device.

[0041] The tank 100 is provided with a shearing agitator 200, a dispersing agitator 300 and a wall-scraping agitator 400 arranged sequentially from bottom to top, and the shearing agitator 200, the dispersing agitator 300 and the wall-scraping agitator 400 are coaxial.

[0042] The tank 100 is provided with a drive assembly, which is connected to the shearing agitator 200, the dispersing agitator 300 and the wall scraping agitator 400. The drive assembly drives the shearing agitator 200 and the dispersing agitator 300 to rotate relative to each other in opposite directions, and the wall scraping agitator 400 to rotate in the opposite direction to the rotation of the shearing agitator 200.

[0043] The inner wall of the tank 100 is provided with a plurality of jet nozzles 150, which extend to the outside of the tank 100 to connect to an external fertilizer base liquid storage tank, and the nozzle opening of the jet nozzle 150 forms a reverse tangent angle with the rotation direction of the stirring paddle.

[0044] In some embodiments, the shearing agitator 200 includes a first agitator shaft 210 and a plurality of shearing serrations 220 disposed on the outer wall of the first agitator shaft 210. The first agitator shaft 210 extends vertically through the tank body 100 to below the bottom of the tank body 100. The drive assembly is provided with a first motor 510 at the bottom of the tank body 100. The first motor 510 is connected to the first agitator shaft 210 in a transmission connection.

[0045] By setting the shearing agitator 200 as the first agitator shaft 210 and a plurality of shearing serrations 220 on the first agitator shaft 210, the first agitator shaft 210 extends vertically through the tank 100 to the bottom of the tank 100 and is connected to the first motor 510 of the drive assembly located at the bottom of the tank 100, thereby driving the operation of the shearing agitator 200.

[0046] The first motor 510 used in this embodiment is a motor in the prior art, as long as it can drive the first stirring shaft 210.

[0047] In some embodiments, micropores 230 are provided on the shearing saw teeth 220, and an air pipe is provided inside the shearing saw teeth 220. One end of the air pipe covers the micropores 230, and the other end extends through the hollow part of the first stirring shaft 210 to the outside of the tank 100 and is connected to a nitrogen gas source.

[0048] By setting micropores 230 on the shearing saw teeth 220, and connecting the micropores 230 to a nitrogen gas source outside the tank 100 through a gas pipe set inside the shearing saw teeth 220, the nitrogen gas supply causes the micropores 230 to generate nitrogen microbubbles during the rotation of the shearing saw teeth 220, which disturbs the liquid-solid interface of the liquid fertilizer and improves the dispersion efficiency of the granular agglomerates.

[0049] In some embodiments, the dispersing impeller 300 includes a second stirring shaft 310 and a plurality of turbine blades 320 disposed on the second stirring shaft 310. The second stirring shaft 310 is sleeved on the first stirring shaft 210. The top of the second stirring shaft 310 extends vertically through the tank 100 to the top of the tank 100. The driving assembly includes a second motor 520 fixed to the top of the tank 100. The second motor 520 is drively connected to the second stirring shaft 310, driving the second stirring shaft 310 to rotate relative to the first stirring shaft 210 in opposite directions.

[0050] By setting the dispersing impeller 300 as the second stirring shaft 310 and a plurality of turbine blades 320 disposed on the second stirring shaft 310, the second stirring shaft 310 is sleeved on the first stirring shaft 210 to achieve coaxial arrangement of the two. The top of the second stirring shaft 310 extends vertically through the tank 100 to the top of the tank 100 and is connected to the second motor 520 of the drive assembly disposed on the top of the tank 100, so that the second stirring shaft 310 and the first stirring shaft 210 rotate relative to each other in opposite directions.

[0051] The second motor 520 used in this embodiment is a motor in the prior art, as long as it can drive the second stirring shaft 310.

[0052] In this embodiment, the transmission connection between the first motor 510 and the first stirring shaft 210, as well as the transmission connection between the second motor 520 and the second stirring shaft 310, can adopt either a gearbox structure or a coupling structure as used in the prior art.

[0053] In some embodiments, the turbine blade 320 is provided with a plurality of openings 330, which penetrate the turbine blade 320.

[0054] By setting several openings 330 through the turbine blade 320, cavitation bubbles are generated in the openings 330 when the turbine blade 320 rotates, providing microscale shear force to the turbine blade 320 and improving the dispersion effect of the dispersing impeller 300.

[0055] In some embodiments, the wall-scraping agitator 400 includes a third agitator shaft 410 and a plurality of scrapers 420 disposed on the third agitator shaft 410. The scrapers 420 are made of polytetrafluoroethylene or have a polytetrafluoroethylene layer covering their outer peripheral walls. The third agitator shaft 410 is connected to the second agitator shaft 310 in a driving connection. The distance between the scrapers 420 and the inner wall of the tank 100 is ≤1mm.

[0056] By setting the wall-scraping agitator 400 as the third agitator 410 and a plurality of scrapers 420 set on the third agitator 410, and setting the scrapers 420 as polytetrafluoroethylene or covering the scrapers 420 with a polytetrafluoroethylene layer, the high temperature resistance and low friction coefficient of polytetrafluoroethylene material are utilized to improve the service life of the scrapers 420 and the smoothness of the scrapers 420 in cleaning the deposits on the tank wall. The third agitator 410 and the second agitator 310 are connected by a drive to achieve synchronous rotation with the second agitator 310, thereby realizing that the wall-scraping agitator 400 and the shearing agitator 200 rotate relative to each other in opposite directions.

[0057] In some embodiments, the second stirring shaft 310 is provided with a transmission block 240 and a transmission groove; or the second stirring shaft 310 is provided with a transmission groove and a transmission block 240 is provided on the second stirring shaft 310, and the transmission block 240 is inserted into the transmission groove.

[0058] The transmission connection between the second stirring shaft 310 and the third stirring shaft 410 is achieved by using a structure in which the transmission block 240 and the transmission groove are plugged in, thus realizing the convenience and stability of the transmission connection between the two.

[0059] Understandably, in order to achieve smooth connection between the third stirring shaft 410 and the second stirring shaft 310, the transmission block 240 is made of a high-temperature resistant plastic block with a certain elasticity, so that the third stirring shaft 410 and the second stirring shaft 310 can cooperate to compress the transmission block 240, thereby achieving the purpose of the third stirring shaft 410 being fitted onto the second stirring shaft 310.

[0060] In some embodiments, the tank body 100 has a heat transfer oil channel 160 and a cooling water channel 170 inside the tank wall. The heat transfer oil channel 160 and the cooling water channel 170 are isolated from each other. The heat transfer oil channel 160 is connected to an external heater through a pipe, and the cooling water channel 170 is connected to an external cooling tower through a pipe.

[0061] By setting mutually isolated heat transfer oil channels 160 and cooling water channels 170 inside the tank wall of the tank body 100, the heat transfer oil channels 160 are connected to an external heater and the cooling water channels 170 are connected to an external cooling tower. The viscosity of the liquid fertilizer is reduced by heating through the heat transfer oil channels 160 and overheating is prevented by cooling through the cooling water channels 170.

[0062] The heater and cooling tower described in this embodiment can both be based on existing technologies.

[0063] In some embodiments, the tank 100 is provided with three layers of ultrasonic concentration probes 140 distributed circumferentially along the inner peripheral wall of the tank 100, and all the ultrasonic concentration probes 140 are electrically connected to the control valve and drive assembly of the jet nozzle 150.

[0064] By installing three layers of ultrasonic concentration probes 140 distributed circumferentially along the inner periphery of the tank 100 inside the tank 100, and electrically connecting all ultrasonic concentration probes 140 to the control valve and drive assembly of the jet nozzle 150, the concentration inside the tank 100 is comprehensively detected by the three layers of ultrasonic concentration probes 140. This allows the jet nozzle 150 to make quantitative compensation when the concentration is insufficient, and also controls the drive assembly to drive the shearing agitator 200, the dispersing agitator 300, and the wall scraping agitator 400 to solve the problem of excessive local concentration, thereby achieving the effect of automatically correcting concentration deviation.

[0065] The ultrasonic concentration probe 140 described in this embodiment can be any existing technology. The electrical connection between the ultrasonic concentration probe 140 and the control valve and drive assembly of the jet nozzle 150 can be any existing technology using cable connection combined with existing sensor control technology.

[0066] In some embodiments, the bottom of the tank 100 is conical, and a plurality of flow guide baffles 130 are provided inside the conical portion. The flow guide baffles 130 are detachably connected to the tank 100, and all the flow guide baffles 130 cooperate to form a spiral flow guide area.

[0067] By setting the bottom of the tank 100 in a conical shape, and setting several flow guide baffles 130 inside the conical part, the flow direction of the liquid fertilizer is guided by the conical structure, and the spiral flow guide area formed by all the flow guide baffles 130 is used to disturb and disrupt the flow vortex, increase the mixing in the radial direction, reduce the stirring blind zone, and improve the stirring effect.

[0068] The fertilizer mixing tank provided in this embodiment, compared with the prior art, has a shearing mixing blade 200, a dispersing mixing blade 300, and a wall-scraping mixing blade 400 arranged sequentially from bottom to top inside the tank body 100. The driving assembly on the tank body 100 is respectively connected to the shearing mixing blade 200, the dispersing mixing blade 300, and the wall-scraping mixing blade 400, driving the shearing mixing blade 200, the dispersing mixing blade 300, and the wall-scraping mixing blade 400. The wall-scraping mixing blade 400 rotates in the opposite direction to the rotation of the shearing mixing blade 200, cooperating with several... The dry jet nozzle 150, in actual use, simultaneously stirs the liquid fertilizer within the mixing tank using a shearing agitator 200, a dispersing agitator 300, and a scraping agitator 400. The bottom shearing agitator 200 shears and breaks down large particles, the middle dispersing agitator 300 disperses micron-sized agglomerates, and the top scraping agitator 400 removes deposits from the inner wall of the tank 100. Combined with the jet nozzle 150's counter-angle injection of the fertilizer base liquid into the liquid fertilizer, the opposing force of the stirring rotation creates microscopic turbulence, improving the uniformity of mixing and achieving uniform mixing of high-solids-content liquid fertilizers. This invention can meet the mixing requirements of liquid fertilizers with a solids content of up to 50%, achieving uniform mixing and preventing stratification.

[0069] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A fertilizer mixing tank, comprising a tank body, wherein the tank body is connected to an inlet pipe and an outlet pipe, both the inlet pipe and the outlet pipe extending into the interior of the tank body, the inlet pipe being connected to an external feeding device, and the outlet pipe being connected to an external receiving device; characterized in that: The tank is equipped with a shearing agitator, a dispersing agitator, and a wall-scraping agitator arranged sequentially from bottom to top, and the shearing agitator, the dispersing agitator, and the wall-scraping agitator are coaxial. The tank is equipped with a drive assembly, which is connected to the shearing agitator, the dispersing agitator, and the wall scraping agitator. The drive assembly drives the shearing agitator and the dispersing agitator to rotate relative to each other in opposite directions, and the wall scraping agitator to rotate in the opposite direction to the rotation of the shearing agitator. The inner wall of the tank is provided with several jet nozzles, which extend to the outside of the tank and connect to the outer fertilizer base liquid storage tank. The nozzle orifice forms a reverse tangent with the rotation direction of the stirring paddle.

2. The fertilizer blender tank of claim 1, wherein: The shearing agitator includes a first agitator shaft and a plurality of shearing teeth disposed on the outer wall of the first agitator shaft. The first agitator shaft extends vertically through the tank body to below the bottom of the tank body. The drive assembly is provided with a first motor at the bottom of the tank body. The first motor is connected to the first agitator shaft in a drive connection.

3. The fertilizer blender tank of claim 2, wherein: The shearing saw teeth are provided with micropores, and the shearing saw teeth are provided with air tubes. One end of the air tube covers the micropores, and the other end extends through the hollow part of the first stirring shaft to the outside of the tank and is connected to a nitrogen gas source.

4. The fertilizer mixing tank of claim 2 or 3, wherein: The dispersing impeller includes a second stirring shaft and a plurality of turbine blades disposed on the second stirring shaft. The second stirring shaft is sleeved on the first stirring shaft, and the top of the second stirring shaft extends vertically through the tank body to the top of the tank body. The drive assembly includes a second motor fixed to the top of the tank body. The second motor is connected to the second stirring shaft for transmission, driving the second stirring shaft to rotate relative to the first stirring shaft in opposite directions.

5. The fertilizer mixing tank as described in claim 4, characterized in that: The turbine blade has several openings that penetrate the turbine blade.

6. The fertilizer mixing tank as described in claim 5, characterized in that: The wall-scraping agitator includes a third agitator shaft and several scrapers mounted on the third agitator shaft. The scrapers are made of polytetrafluoroethylene (PTFE) or have a PTFE layer covering their outer peripheral walls. The third agitator shaft is connected to the second agitator shaft in a driving connection. The distance between the scrapers and the inner wall of the tank is ≤1mm.

7. The fertilizer mixing tank as described in claim 6, characterized in that: The second stirring shaft is provided with a transmission block and a transmission groove; or the second stirring shaft is provided with a transmission groove and a transmission block, wherein the transmission block and the transmission groove are inserted into each other.

8. The fertilizer mixing tank as described in claim 2 or 3, characterized in that: The tank body has a heat transfer oil channel and a cooling water channel inside the tank wall. The heat transfer oil channel and the cooling water channel are isolated from each other. The heat transfer oil channel is connected to an external heater through a pipe, and the cooling water channel is connected to an external cooling tower through a pipe.

9. The fertilizer mixing tank as described in claim 2 or 3, characterized in that: The tank is equipped with three layers of ultrasonic concentration probes distributed circumferentially along the inner circumferential wall of the tank. All ultrasonic concentration probes are electrically connected to the control valve and drive assembly of the jet nozzle.

10. The fertilizer mixing tank as described in claim 2 or 3, characterized in that: The bottom of the tank is conical, and several flow guide baffles are provided inside the conical part. The flow guide baffles are detachably connected to the tank, and all the flow guide baffles cooperate to form a spiral flow guide area.

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