Under-liquid feeding and nitrogen gas cooperating stirring device

Abstract

This disclosure relates to the field of mixing device technology, and provides a submerged feeding and nitrogen-coordinated mixing device, which includes a feeding station, a mixing tank, a mixing device, and a nitrogen conveying mechanism. The feeding station has a discharge pipe; the mixing tank has a feed inlet and a submerged feeding pipe located inside the mixing tank; the mixing device is disposed inside the mixing tank for mixing the liquid; the nitrogen conveying mechanism is disposed at the bottom wall of the mixing tank for conveying rising air bubbles into the mixing tank; the submerged feeding pipe can deliver powder to below the liquid level in the mixing tank, and the rising air bubbles conveyed by the nitrogen conveying mechanism can impact the powder and the inner wall of the mixing tank. This submerged feeding and nitrogen-coordinated mixing device solves the problem of powder sticking to the wall and causing "internal powder loss," and through the synergistic effect of the nitrogen conveying mechanism and the mixing device, ensures that the powder can be uniformly mixed and dispersed without dead zones within the mixing tank.

Description

Technical Field

[0001] This disclosure relates to the field of stirring device technology, and in particular to a submerged feeding and nitrogen-coordinated stirring device. Background Technology

[0002] In modern production processes of nano-conductive slurries such as graphene and carbon nanotubes, vacuum negative pressure feeding has become a mainstream method widely adopted in the industry to reduce dust pollution. Its basic working principle is: a vacuum pump establishes negative pressure in a sealed batching tank, and the pressure difference is used to draw powder stored in an external feeding station into the tank through pipelines.

[0003] However, this common vacuum feeding method has a long-overlooked but serious design flaw: after the powder is sucked into the tank, its release point is usually located in the gas space or above the liquid surface inside the tank. The powder first collides and adheres to the dry tank top, tank walls, or stirring shaft, and then falls into the solvent under gravity. This process leads to serious "initial wall adhesion" and "bridging" problems, resulting in discontinuous feeding. Although this solution solves the environmental problem of "dust escape," it fails to solve the process problem of "powder internal loss," resulting in the actual amount of powder participating in dispersion being far lower than the amount delivered by the feeding station, making it impossible to accurately control the slurry solids content and causing poor batch consistency.

[0004] In addition, thorough stirring, wetting, and dispersion of powder in liquid is also an important step in the preparation of nano-conductive slurry, and it has a crucial impact on the quality of the slurry. Summary of the Invention

[0005] This disclosure provides a device for submerged feeding and nitrogen-coordinated stirring, which addresses the problems of powder sticking to the wall, resulting in internal powder loss, affecting the solid content of the slurry, and poor powder wetting and dispersion efficiency in related technologies' vacuum feeding devices for conductive slurries.

[0006] The submersible feeding and nitrogen-coordinated stirring device provided in this embodiment includes a feeding station, a stirring tank, a stirring device, and a nitrogen conveying mechanism;

[0007] The feeding station has a discharge pipeline for discharging materials; The mixing tank is provided with a feed inlet connected to the discharge pipeline, and the feed inlet is also connected to a downward retractable submersible feeding pipe inside the mixing tank; The stirring device is located inside the stirring tank and is used to stir and mix the liquid in the stirring tank; The nitrogen delivery mechanism is connected to the bottom wall of the mixing tank and is used to deliver rising air bubbles into the interior of the mixing tank. The submersible feeding pipe can deliver powder to a position below the liquid level in the mixing tank. The stirring device simultaneously mixes the liquid and the nitrogen conveying mechanism simultaneously delivers rising air bubbles to impact the powder and the inner wall of the mixing tank.

[0008] In one embodiment, the submerged feeding and nitrogen-co-stirring device further includes a weight sensor and a linkage control unit; The weight sensor is located at the bottom of the mixing tank; The top of the mixing tank is also provided with a solvent dispensing pipe, and the linkage control unit is located in the solvent dispensing pipe and electrically connected to the weight sensor. The linkage control unit can adjust the opening and closing state of the solvent dispensing tube according to the detection information of the weight sensor.

[0009] In one possible embodiment, the submersible feeding tube further includes a drive mechanism; The drive mechanism is electrically connected to the weight sensor and can adjust the insertion depth of the submersible feeding tube below the liquid level according to the detection information of the weight sensor.

[0010] In one embodiment, the stirring device includes: Multiple high-speed stirring shafts are arranged from top to bottom inside the mixing tank, and each high-speed stirring shaft is spaced apart with a high-speed dispersing disc along its own axial direction; A low-speed stirring shaft is installed inside the mixing tank from top to bottom, and stirring blades are provided at the bottom of the low-speed stirring shaft.

[0011] In one embodiment, the bottom wall of the mixing tank is configured as a downwardly convex conical wall; The stirring blade includes an inclined section parallel to the conical wall and a vertical section parallel to the inner wall of the stirring tank.

[0012] In one embodiment, the mixing tank is provided with a discharge port and a sampling port at the lowest point of the conical wall.

[0013] In one embodiment, the submerged feeding and nitrogen-co-stirring device further includes at least a tank jacket fitted onto the outside of the stirring tank; The tank jacket forms a cooling gap with the mixing tank.

[0014] In one embodiment, the submerged feeding and nitrogen-co-stirring device further includes a water cooling system; The water cooling system has a cooling water inlet and a cooling water outlet that are connected to the cooling gap.

[0015] In one embodiment, the top of the mixing tank is also provided with a nitrogen pressure relief port; The nitrogen pressure relief port is connected to the external environment through an exhaust pipe, and a pleated filter element and a vacuum pump are sequentially arranged in the exhaust pipe along the exhaust direction. The vacuum pump is used to pump out the exhaust pipe and maintain the mixing tank under negative pressure.

[0016] In one possible implementation, the bottom of the feeding station is configured as a downwardly convex conical bottom; The discharge pipe is connected to the lowest end of the conical bottom, and a flexible vibrator or fluidizing device is also provided in the conical bottom.

[0017] The technical solution provided in this disclosure has the following advantages compared with related technologies: The submersible feeding and nitrogen-coordinated stirring device provided in this embodiment can directly feed powder into the mixing tank below the solvent level through the submersible feeding pipe. The powder is directly fed into the "solvent interior" below the solvent surface, so that the powder can directly enter the wet solvent the moment it leaves the submersible feeding pipe and be quickly enveloped and wetted by the liquid solvent. This achieves a dust-proof path of "vacuum conveying + wet direct feeding", thus completely eliminating the possibility of powder contacting the mixing tank and effectively solving the problem of powder loss caused by "powder sticking to the wall" and "powder bridging". Furthermore, the stirring device simultaneously generates a stirring action to mix the liquid. A nitrogen delivery mechanism located at the bottom wall of the mixing tank simultaneously delivers a rising stream of nitrogen bubbles into the tank. This rapidly rising nitrogen bubble stream from the bottom of the tank forms convection with the powder discharged downwards from the submersible feed pipe, allowing the nitrogen bubbles to immediately envelop and impact the powder in the solvent. This forcibly and rapidly disperses the powder and carries it away from the outlet area of ​​the submersible feed pipe, effectively preventing localized accumulation of powder at the outlet. In addition, the nitrogen bubble stream discharged by the nitrogen delivery mechanism impacts the inner wall of the mixing tank and collides with the stirring flow field created by the stirring device, further forming strong convection. This ensures that there are no dead zones inside the mixing tank, and the powder is further evenly dispersed.

[0018] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0019] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. Several embodiments of this disclosure are illustrated in the drawings by way of example and not limitation, in which: In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0020] Figure 1 A schematic diagram of a submersible feeding and nitrogen-co-stirring device provided in an embodiment of this disclosure is shown.

[0021] Explanation of the labels in the diagram: 1. Feeding station; 2. Mixing tank; 21. Submersible feed pipe; 22. Tank jacket; 221. Cooling water inlet; 222. Cooling water outlet; 23. Exhaust pipe; 231. Pleated filter element; 232. Vacuum pump; 24. Sampling port; 25. Discharge port; 26. Solvent delivery pipe; 3. Mixing device; 31. High-speed mixing shaft; 311. High-speed dispersing disc; 32. Low-speed mixing shaft; 321. Mixing blades; 4. Nitrogen delivery mechanism; 5. Weight sensor. Detailed Implementation

[0022] To make the objectives, features, and advantages of this disclosure more apparent and understandable, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0023] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0024] Combination Figure 1 As shown, the submerged feeding and nitrogen-co-stirring device provided in this embodiment includes a feeding station 1, a stirring tank 2, a stirring device 3, and a nitrogen conveying mechanism 4. The feeding station 1 has a discharge pipe for discharging material. The stirring tank 2 is provided with a feed inlet connected to the discharge pipe, and the feed inlet is also connected to a downwardly retractable submerged feeding pipe 21 inside the stirring tank 2. The stirring device 3 is disposed inside the stirring tank 2 for stirring and mixing the liquid in the stirring tank 2. The nitrogen conveying mechanism 4 is disposed at the bottom wall of the stirring tank 2 for conveying rising air bubbles into the interior of the stirring tank 2. Among them, the submersible feeding pipe 21 can feed the powder to the liquid level below the mixing tank 2, the stirring device 3 simultaneously stirs and mixes the liquid, and the nitrogen conveying mechanism 4 simultaneously conveys the rising air bubble flow to impact the powder and the inner wall of the mixing tank 2.

[0025] The submersible feeding and nitrogen-coordinated stirring device provided in this embodiment can be applied, but is not limited to, to the stirring and preparation of nano-conductive slurries such as graphene and carbon nanotubes. The usage process will be described using this as an example.

[0026] In practical use, the nitrogen-co-stirring device first adds a certain amount of solvent to the stirring tank 2, and then the feeding station 1 can transport the powder to be stirred to the submersible feeding pipe 21 inside the stirring tank 2 through the discharge pipe.

[0027] The core of vacuum negative pressure feeding lies in using pressure difference to complete "pneumatic conveying". Through the coordinated work of vacuum pump suction and backflushing system discharge, the automatic cycle of "vacuum suction-backflushing discharge" is realized through PLC controller, so as to ultimately achieve efficient and clean conveying of powder.

[0028] The bottom of the feeding station 1 can be set as a raised conical bottom to facilitate material discharge. In addition, the feeding port of the feeding station 1 is generally equipped with a side air intake and dust removal device to prevent dust from overflowing from the feeding port.

[0029] During the vacuum pump suction stage (establishing negative pressure), a negative pressure is created inside the feeding station 1. At this time, the feed valve at the feed inlet of the feeding station 1 opens, and the powder is sucked into the feeding station 1 and falls into the conical bottom of the feeding station 1 under gravity. During the discharge stage, the PLC controller closes the feed valve and the vacuum pump, and starts the pneumatic backflushing system. At this time, the powder at the conical bottom of the feeding station 1 can enter the discharge pipeline under the pressure of the pneumatic backflushing system, and finally the powder is delivered to the mixing tank by the submersible feed pipe 21 located below the liquid level in the mixing tank 2. The powder is placed below the solvent level in the submerged feed pipe 21, allowing it to be directly fed into the solvent below the liquid surface. This ensures that the powder enters the wet solvent immediately upon leaving the submerged feed pipe 21, where it is quickly enveloped and wetted by the liquid solvent. This achieves a dust-proof path of "vacuum conveying + wet direct feeding," thus physically eliminating the possibility of powder contact with the mixing tank 2 and effectively solving the problems of powder loss caused by "powder sticking to the wall" and "powder bridging." Furthermore, simultaneously, the stirring device 3 can generate a stirring action to mix the liquid, and the nitrogen conveying mechanism 4, located at the bottom wall of the mixing tank 2, can simultaneously convey rising air bubbles into the mixing tank 2. This allows the rapidly rising nitrogen bubbles from the bottom of the mixing tank 2 to form convection with the powder discharged downwards from the submersible feeding pipe 21, enabling the nitrogen bubbles to immediately envelop and impact the powder in the solvent, forcibly and rapidly dispersing the powder and carrying it away from the outlet area of ​​the submersible feeding pipe 21, effectively preventing localized accumulation of powder at the outlet of the submersible feeding pipe 21. Moreover, the nitrogen bubbles discharged from the nitrogen conveying mechanism 4 also impact the inner wall of the mixing tank 2 and collide with the stirring flow field formed by the stirring device 3, further forming strong convection, thus ensuring that there are no dead corners inside the mixing tank 2 and that the powder can be further evenly dispersed.

[0030] In summary, the submerged feeding and nitrogen-coordinated stirring device provided in this embodiment can achieve a dust-proof path of "vacuum conveying + wet direct feeding" through the feeding station 1 and the submerged feeding pipe 21, effectively solving the problem of powder sticking to the wall and causing "internal powder loss". Through the synergistic effect of the nitrogen conveying mechanism 4 and the stirring device 3, the powder can be forcibly and quickly dispersed below the solvent surface, and the nitrogen bubble flow can also collide and convect with the stirring flow field, fully ensuring that the powder can be uniformly mixed and dispersed without dead corners in the stirring tank 2.

[0031] In addition, it is worth noting that the aforementioned submersible feeding pipe 21 can be specifically configured as a corrugated pipe with telescopic properties, or an elastic flexible hose with elastic telescopic function, or a telescopic sleeve with rigid telescopic function, so as to ensure that the submersible feeding pipe 21 can flexibly extend and retract according to the actual liquid level of the solvent in the mixing tank 2, and ensure that the bottom outlet of the submersible feeding pipe 21 can be stably inserted into the solvent 40cm-50cm below the current actual liquid level during feeding.

[0032] In addition, the rising nitrogen bubbles conveyed by the nitrogen conveying mechanism 4 at the feeding station 1 when feeding powder are not strictly synchronized in terms of time. The nitrogen conveying mechanism 4 can supply nitrogen slightly earlier than the feeding station 1.

[0033] In one embodiment, the submerged feeding and nitrogen-co-stirring device further includes a weight sensor 5 and a linkage control unit; the weight sensor 5 is located at the bottom of the stirring tank 2; a solvent delivery pipe 26 is also provided at the top of the stirring tank 2, and the linkage control unit is located in the solvent delivery pipe 26 and electrically connected to the weight sensor 5; the linkage control unit can adjust the opening and closing state of the solvent delivery pipe 26 according to the detection information of the weight sensor 5.

[0034] Specifically, in combination Figure 1In further detail, the weight sensor 5 can be specifically supported and installed at the bottom of the mixing tank 2, and the weight sensor 5 can use high-precision weight detection (accuracy ±0.1kg) to achieve accurate detection of the actual amount added during the solvent addition process.

[0035] Furthermore, the aforementioned linkage control unit can be, but is not limited to, a linkage solenoid valve located in the solvent delivery pipe 26, and is electrically connected to the weight sensor 5 via the controller. In this way, the weight sensor 5 monitors the cumulative amount of solvent added to the mixing tank 2 in real time, and when the preset weight value is reached, the controller can control the linkage solenoid valve to close the solvent delivery pipe 26 according to the detection information, thereby automatically cutting off the solvent feed and ensuring that the solid content of the final slurry produced by the mixing tank 2 is absolutely accurate.

[0036] In one embodiment, the submersible feeding tube 21 further includes a drive mechanism; the drive mechanism is electrically connected to the weight sensor 5 and can adjust the insertion depth of the submersible feeding tube 21 below the liquid level according to the detection information of the weight sensor 5.

[0037] Specifically, the drive mechanism can be configured as a "stepper motor + linear transmission assembly", and the controller in the stepper motor is electrically connected to the weight sensor 5. In this way, the controller in the stepper motor can determine the actual liquid level of the solvent in the mixing tank 2 based on the actual weight information detected by the weight sensor 5, and can accurately control the output angle of the stepper motor based on the actual liquid level information, thereby adjusting the "linear transmission assembly" to move a certain distance. In this way, the "linear transmission assembly" can drive the submersible feeding pipe 21 to extend downward, thereby ensuring that the submersible feeding pipe 21 can be accurately inserted to the optimal depth below the liquid level.

[0038] In addition, the aforementioned "linear transmission assembly" can be, but is not limited to, a gear and rack assembly, a lead screw and nut assembly, etc., as long as it can convert the rotation output by the stepper motor into linear motion.

[0039] In one embodiment, the stirring device 3 includes a high-speed stirring shaft 31 and a low-speed stirring shaft 32; multiple high-speed stirring shafts 31 are arranged from top to bottom inside the stirring tank 2, and each high-speed stirring shaft 31 is provided with a high-speed dispersing disc 311 at intervals along its own axial direction; one low-speed stirring shaft 32 is arranged from top to bottom inside the stirring tank 2, and a stirring blade 321 is provided at the bottom of the low-speed stirring shaft 32.

[0040] Specifically, in combination Figure 1In further detail, multiple high-speed stirring shafts 31 can be arranged around the periphery of the low-speed stirring shaft 32, such as, but not limited to, four or five. Since each high-speed stirring shaft 31 is provided with a high-speed dispersion disc 311 at intervals along its own axial direction, the high-speed stirring shaft 31 can drive the high-speed dispersion disc 311 to rotate at high speed, generating strong shearing force to further break up the powder agglomerates initially dispersed by nitrogen. The bottom of the low-speed stirring shaft 32 is provided with stirring blades 321, which can be arranged close to or in close contact with the inner bottom wall of the mixing tank 2. When the stirring blades 321 rotate with the low-speed stirring shaft 32, they can mechanically remove the thin layer of material that may remain on the inner bottom wall of the mixing tank 2 like a "scraper", and form a "mechanical + fluid" dual anti-sticking wall protection with nitrogen flushing.

[0041] Furthermore, the high-speed stirring shaft 31 and the low-speed stirring shaft 32 mentioned above can be driven separately by a high-speed motor and a low-speed motor, or they can be driven by a common motor. However, a gearbox is directly installed between the high-speed stirring shaft 31 and the low-speed stirring shaft 32 to achieve different rotation speeds when they are driven.

[0042] In one embodiment, the bottom wall of the mixing tank 2 is configured as a downwardly protruding conical wall; the stirring blade 321 includes an inclined section parallel to the conical wall and a vertical section parallel to the inner wall of the mixing tank 2.

[0043] Specifically, in combination Figure 1 In further detail, the bottom wall of the mixing tank 2 is designed as a downwardly convex conical wall. This allows the sediment in the powder to accumulate on the bottom wall of the mixing tank 2 during the mixing process. The mixing blade 321 includes an inclined section parallel to the conical wall and a vertical section parallel to the inner wall of the mixing tank 2. When the mixing blade 321 rotates and mixes, the centrifugal force generated can further "throw" the sediment in the conical wall outward and upward, so that the sedimented powder can be fully mixed by the mixing blade 321 at the bottom of the mixing tank 2.

[0044] In one embodiment, the mixing tank 2 is provided with a discharge port 25 and a sampling port 24 at the lowest point of the conical wall.

[0045] Specifically, in combination Figure 1 To elaborate further, the discharge port 25 is located at the lowest point of the conical wall of the mixing tank 2, so that when the mixing tank 2 discharges material, the slurry can be discharged quickly and fully; the sampling port 24 can be correspondingly located at the branch of the discharge port 25, so that a small amount of slurry can be extracted during the mixing process to detect the solid content, viscosity and dispersion in real time, ensuring quality control during the slurry mixing process.

[0046] In one embodiment, the submerged feeding and nitrogen-co-stirring device further includes at least a tank jacket 22 that is fitted onto the outside of the stirring tank 2; the tank jacket 22 and the stirring tank 2 form a cooling gap.

[0047] Specifically, in combination Figure 1 In further detail, the tank jacket 22 can be fitted onto the lower half of the mixing tank 2, and the tank jacket 22 and the mixing tank 2 can form a cooling gap. Cooling airflow or cooling medium (such as ice) can be introduced into the cooling gap to control the temperature of the mixing tank 2, consume the shear heat generated by high-speed dispersion and nitrogen bubbling, accurately control the process temperature, prevent excessive solvent evaporation, and maintain the stability of the slurry.

[0048] In one embodiment, the submerged feeding and nitrogen-co-stirring device further includes a water cooling system; the water cooling system has a cooling water inlet 221 and a cooling water outlet 222 that are connected to the cooling gap.

[0049] Specifically, in combination Figure 1 In further detail, the cooling water inlet 221 can be correspondingly opened at the bottom of the cooling gap, and the cooling water outlet 222 can be correspondingly opened at the fixed part of the cooling gap. In this way, when cooling water is delivered into the cooling gap, the cooling water can flow upward by overflowing, thereby improving the cooling efficiency of the cooling water.

[0050] In one embodiment, a nitrogen pressure relief port is also provided on the top of the mixing tank 2; the nitrogen pressure relief port is connected to the external environment through an exhaust pipe 23, and a pleated filter element 231 and a vacuum pump 232 are arranged sequentially along the exhaust direction in the exhaust pipe 23; the vacuum pump 232 is used to pump the exhaust pipe 23 and maintain the mixing tank 2 under negative pressure.

[0051] Specifically, in combination Figure 1 In further detail, a nitrogen pressure relief port and an exhaust pipe 23 are also provided at the top of the mixing tank 2. The exhaust pipe 23 is equipped with a pleated filter element 231 and a vacuum pump 232. The vacuum pump 232 can generate a pumping action, creating a certain suction through the exhaust pipe 23 to maintain a slightly negative pressure inside the mixing tank 2. Moreover, the pleated filter element 231 in the exhaust pipe 23 can also filter the discharged nitrogen gas, thereby preventing any trace amounts of powder that may remain in the nitrogen gas from polluting the environment.

[0052] In one embodiment, the bottom of the feeding station 1 is configured as a downwardly convex conical bottom; the discharge pipe is connected to the lowest end of the conical bottom, and a flexible vibrator or fluidizing device is also provided in the conical bottom.

[0053] Specifically, the bottom of the feeding station 1 is also set as a downward-convex conical bottom, and a flexible vibrator or fluidizing device is also installed in the conical bottom. This allows the powder in the feeding station 1 to be discharged more smoothly and fully through the flexible vibrator or fluidizing device.

[0054] Furthermore, 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0055] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A device for submerged feeding and nitrogen-coordinated stirring, characterized in that, include: The feeding station (1) has a discharge pipeline for discharging materials; The mixing tank (2) is provided with an inlet connected to the discharge pipeline, and the inlet is also connected to a downward retractable submersible feeding pipe (21) inside the mixing tank (2). A stirring device (3) is installed inside the stirring tank (2) for stirring and mixing the liquid in the stirring tank (2); A nitrogen delivery mechanism (4) is provided at the bottom wall of the mixing tank (2) for delivering rising gas bubbles into the interior of the mixing tank (2); The submersible feeding pipe (21) can deliver powder to the liquid level below the mixing tank (2), the stirring device (3) simultaneously stirs and mixes the liquid, and the nitrogen conveying mechanism (4) simultaneously conveys rising air bubbles to impact the powder and the inner wall of the mixing tank (2).

2. The submersible feeding and nitrogen-coordinated stirring device according to claim 1, characterized in that, It also includes a weight sensor (5) and a linkage control unit; The weight sensor (5) is located at the bottom of the mixing tank (2); The top of the mixing tank (2) is also provided with a solvent delivery pipe (26), and the linkage control unit is located in the solvent delivery pipe (26) and electrically connected to the weight sensor (5). The linkage control unit can adjust the opening and closing state of the solvent dispensing tube (26) according to the detection information of the weight sensor (5).

3. The submersible feeding and nitrogen-coordinated stirring device according to claim 2, characterized in that, The submersible feeding tube (21) also includes a drive mechanism; The drive mechanism is electrically connected to the weight sensor (5) and can drive and adjust the insertion depth of the submersible feeding tube (21) below the liquid level according to the detection information of the weight sensor (5).

4. The submersible feeding and nitrogen-coordinated stirring device according to claim 1, characterized in that, The stirring device (3) includes: Multiple high-speed stirring shafts (31) are arranged from top to bottom inside the mixing tank (2), and each high-speed stirring shaft (31) is provided with a high-speed dispersion disc (311) at intervals along its own axial direction. A low-speed stirring shaft (32) is provided from top to bottom inside the stirring tank (2), and stirring blades (321) are provided at the bottom of the low-speed stirring shaft (32).

5. The submersible feeding and nitrogen-coordinated stirring device according to claim 4, characterized in that, The bottom wall of the mixing tank (2) is configured as a downwardly convex conical wall; The stirring blade (321) includes an inclined section parallel to the conical wall and a vertical section parallel to the inner wall of the stirring tank (2).

6. The submersible feeding and nitrogen-coordinated stirring device according to claim 5, characterized in that, The mixing tank (2) is provided with a discharge port (25) and a sampling port (24) at the lowest point of the conical wall.

7. The submersible feeding and nitrogen-coordinated stirring device according to claim 1, characterized in that, It also includes at least a tank jacket (22) that is fitted onto the outside of the mixing tank (2); The tank jacket (22) and the mixing tank (2) form a cooling gap.

8. The submersible feeding and nitrogen-coordinated stirring device according to claim 7, characterized in that, It also includes a water cooling system; The water cooling system has a cooling water inlet (221) and a cooling water outlet (222) that are connected to the cooling gap.

9. The submersible feeding and nitrogen-coordinated stirring device according to claim 1, characterized in that, The top of the mixing tank (2) is also provided with a nitrogen pressure relief port; The nitrogen pressure relief port is connected to the external environment through the exhaust pipe (23), and the exhaust pipe (23) is provided with a pleated filter element (231) and a vacuum pump (232) in sequence along the exhaust direction. The vacuum pump (232) is used to pump the exhaust pipe (23) and maintain the mixing tank (2) under negative pressure.

10. The submersible feeding and nitrogen-co-stirring device according to any one of claims 1 to 9, characterized in that, The bottom of the feeding station (1) is configured as a downward-convex conical bottom; The discharge pipe is connected to the lowest end of the conical bottom, and a flexible vibrator or fluidizing device is also provided in the conical bottom.

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