Automatic blending method for formula type products

Abstract

The invention discloses an automatic blending method for a formula type product, relates to the technical field of product blending, and aims to solve the problems of long mixing time, low proportioning precision, serious sampling pollution and large waste liquid generation amount in a traditional blending method. The method is implemented based on a closed-loop circulation mixing system and comprises the following steps: 1) presetting formula parameters; (2) dynamically conveying main materials and circularly starting; (3) auxiliary materials are accurately added; 4) dual dynamic mixing reinforcement; 5) online concentration real-time monitoring; and 6) sampling and rechecking in a clean environment. According to the invention, continuous operation of feeding and mixing is realized, accurate batching is realized through mass flow feedback control, sampling times are reduced in combination with online detection, sampling environment is controlled, mixing efficiency and product quality stability are significantly improved, pollution and waste liquid generation are reduced, and the device is especially suitable for mixing products with high purity requirements, such as electronic chemicals.

Description

Technical Field

[0001] This application relates to the field of wet electronic chemicals technology, specifically to an automated mixing method for formulated products. Background Technology

[0002] In the production of formulated products, the scientific nature of the mixing method directly determines product quality and production efficiency. Current mixing methods for formulated products mostly adopt a "static weighing - batch mixing - multiple sampling and testing" model. The specific process is as follows: first, each raw material is weighed manually using weighing equipment; then, all raw materials are put into a mixing container at once, and the stirring device is started for batch mixing. After mixing, multiple samples need to be taken for testing until the proportions are confirmed to be qualified.

[0003] However, this traditional mixing method has many fatal flaws: First, the mixing efficiency is low, requiring all raw materials to be weighed before mixing can begin, and relying solely on a single stirring device for in-tank mixing results in poor material uniformity and long mixing time; Second, the proportioning accuracy is difficult to guarantee, as raw material weight control depends on manual operation, which is prone to weighing errors and cannot be adjusted in real time according to the material state during the mixing process, leading to poor product quality stability; Third, the risk of pollution is high, as for products with extremely high purity requirements such as electronic chemicals, manual weighing, raw material transfer, and multiple sampling processes are highly susceptible to environmental contamination; Fourth, the amount of waste liquid generated is large, as multiple sampling and testing require a large amount of materials and generate a significant amount of sampling waste liquid, which wastes raw materials and increases environmental treatment costs.

[0004] Therefore, developing an automated mixing method for formulated products that can achieve automatic and precise ingredient dispensing, efficient dynamic mixing, and reduce pollution and waste liquid generation has become an urgent technical problem to be solved in this field. Summary of the Invention

[0005] The purpose of this application is to provide an automatic mixing method for formulated products, so as to solve, to at least to some extent, the technical problems existing in the above-mentioned background technology, such as long mixing time, low proportioning accuracy, large sampling pollution and large amount of waste liquid generation.

[0006] To achieve the above objectives, this application provides the following technical solution: an automatic mixing method for formulated products, implemented based on a closed-loop circulating mixing system. First, the core components of the closed-loop circulating mixing system are described to clarify the basis for the method's implementation: the closed-loop circulating mixing system includes a mixing tank, circulating pipelines, a mixer, a circulating pump, a concentration detector, a main material pipe, at least two auxiliary material pipes, and a PLC control system. The mixing tank is equipped with a stirrer and a magnetic level gauge. The stirrer is connected to a drive motor at the top of the mixing tank. The bottom of the mixing tank has a circulating outlet, and the top side has a circulating inlet. A self-operated rotating nozzle is installed at the circulating inlet. The two ends of the circulating pipeline are respectively connected to the mixing tank. The system comprises a circulating outlet and a self-operated rotary nozzle, forming a closed-loop circulation channel. A circulating pump, a mixer, and a concentration detector are sequentially installed along the liquid flow direction on the circulation pipeline. The mixer includes a first inlet, a second inlet, and a third outlet. The first and third inlets are connected to the circulation pipeline, and the second inlet is connected to the main material pipe. At least two auxiliary material pipes have one end connected to the top of the mixing tank and the other end connected to the corresponding auxiliary material storage device. Mass flow meters and pneumatic switching valves are installed on the main material pipe and each auxiliary material pipe. The mass flow meters, pneumatic switching valves, circulating pump, drive motor, concentration detector, and magnetic level gauge are all electrically connected to the PLC control system to achieve data transmission and automatic control.

[0007] Based on the above closed-loop mixing system, the automatic mixing method for formulated products of the present invention specifically includes the following steps:

[0008] S1: Preset Recipe Parameters

[0009] According to the technical requirements of the formula product to be produced, the mass ratio, single addition amount, concentration range and concentration stability judgment time of each material (main material and multiple auxiliary materials) are entered into the PLC control system to complete the initial setting of the formula parameters; at the same time, according to the preset addition amount of each auxiliary material, the auxiliary material tube with the corresponding diameter is matched for each auxiliary material (the auxiliary material with a larger addition amount matches the large diameter auxiliary material tube, and the auxiliary material with a smaller addition amount matches the small diameter auxiliary material tube).

[0010] S2: Dynamic conveying and cycle start of main materials

[0011] The PLC control system issues a command to start the circulating pump. The circulating pump drives the initial medium (which can be a small amount of solvent or the base material to be mixed) in the closed-loop circulation channel to form a stable circulating flow field. Subsequently, the PLC control system controls the pneumatic switch valve on the main material pipe to open. The main material is transported from the auxiliary material storage device to the second inlet of the mixer through the main material pipe. It meets the initial medium (or subsequent circulating material) in the circulating flow field that enters from the first inlet of the mixer. The mixer has a first conical cavity and a second open cavity arranged in sequence along the liquid flow direction. The first conical cavity is filled with a Pall ring or Taylor ring disperser. The main material and the circulating material are initially mixed in the first conical cavity by the shearing and dispersion action of the disperser. Then, they enter the second open cavity for diffusion mixing. The mixed material flows out from the third outlet and merges into the circulation pipe. It flows back to the mixing tank with the circulating flow field, completing the dynamic conveying and circulation initialization of the main material.

[0012] S3: Precise addition of auxiliary materials

[0013] During the main material conveying process, the mass flow meter on the main material pipe collects the instantaneous and cumulative conveying data of the main material in real time and transmits the data to the PLC control system in real time. The PLC control system compares the collected cumulative conveying volume of the main material with the preset formula parameters. When the cumulative conveying volume of the main material reaches the preset first auxiliary material addition trigger threshold, the control system issues a command to open the pneumatic switch valve on the auxiliary material pipe matched with the corresponding auxiliary material, and the auxiliary material begins to be conveyed into the mixing tank. At the same time, the mass flow meter on the auxiliary material pipe collects the cumulative conveying volume data of the auxiliary material in real time and feeds it back to the control system. When the cumulative conveying volume of the auxiliary material reaches the preset value, the control system controls the corresponding pneumatic switch valve to close, completing the precise addition of this auxiliary material. Following the above logic, the addition of all auxiliary materials is completed in sequence.

[0014] Preferably, in step S3, the auxiliary material pipe includes a first auxiliary material pipe (large diameter) and a second auxiliary material pipe (small diameter) with different diameters. For auxiliary materials with a large addition amount (such as auxiliary materials with a proportion ≥10%), the first auxiliary material pipe is used for conveying to ensure conveying efficiency; for auxiliary materials with a small addition amount (such as auxiliary materials with a proportion <10%), the second auxiliary material pipe is used for conveying. Combined with the high-precision detection of the mass flow meter, the addition accuracy of small dose materials is improved.

[0015] S4: Dual Dynamic Hybrid Enhancement

[0016] While the auxiliary materials are added, the PLC control system starts the drive motor, which drives the stirring shaft and staggered blades of the agitator to rotate at high speed (preferably 200-400 r / min) to stir and mix the materials in the mixing tank, preventing material from settling and achieving initial homogenization of the materials in the tank. At the same time, the circulating flow field continues to operate, and the materials circulate between the mixing tank and the circulating pipe, undergoing secondary fine mixing each time they flow through the mixer. In addition, when the materials in the circulating pipe flow back to the mixing tank, they are evenly sprayed into the tank at 270° by a self-powered rotating nozzle, further enhancing the disturbance effect of the materials in the tank. This forms a dual dynamic mixing mode of "tank stirring and mixing + pipe circulation fine mixing + backflow spray disturbance", which greatly improves the uniformity and efficiency of material mixing.

[0017] S5: Real-time online concentration monitoring

[0018] During the dual dynamic mixing process, the concentration detector on the circulation pipeline monitors the concentration of the flowing mixture in real time and transmits the detected concentration data to the PLC control system in real time. The control system compares the real-time concentration data with the preset acceptable concentration range. If the real-time concentration exceeds the acceptable range, the control system adjusts the opening of the pneumatic switch valve of the corresponding material pipe according to the deviation value (if the concentration is too low, the opening of the main material pipe switch valve is appropriately increased, or the corresponding auxiliary material is added) until the concentration enters the acceptable range. If the real-time concentration is within the acceptable range, the control system starts timing and continuously monitors the concentration stability.

[0019] S6: Cleanroom Sampling Verification

[0020] Once the concentration value detected by the concentration detector stabilizes within the preset acceptable range and remains stable for the preset stability judgment time (preferably 3-8 minutes), the PLC control system determines that the material is mixed evenly and the proportion is qualified, and issues a sampling prompt signal. The operator takes a sample through a clean sampling box connected to the circulation pipeline. The clean sampling box has a sealed sterile structure, which can effectively isolate environmental impurities. The sample is sent for verification. If the verification result meets the product technical requirements, the PLC control system controls the circulation pump and drive motor to stop running, completing this mixing operation. If the verification result does not meet the requirements, return to step S5, and repeat the concentration monitoring and adjustment until the verification is qualified.

[0021] In addition, during the entire mixing process, the magnetic float level gauge on the mixing tank collects the material level data in the tank in real time and feeds it back to the PLC control system. When the liquid level exceeds the preset safety range (upper or lower limit), the control system immediately issues an early warning signal and controls the pneumatic switch valves on all material pipes to close, while stopping the circulation pump and drive motor to ensure the safety of the mixing process.

[0022] Compared with the prior art, the beneficial effects of this application include at least the following:

[0023] 1. Significantly improved mixing efficiency and greatly shortened production cycle: This invention adopts a continuous operation mode of "adding materials while mixing", which can start mixing without waiting for all raw materials to be weighed. At the same time, through the dual dynamic mixing mode of "tank stirring + pipe circulation fine mixing + backflow spray disturbance", the material mixing effect is enhanced. Compared with the traditional single stirring mixing method, the mixing efficiency is increased by more than 40%, and the mixing cycle is greatly shortened.

[0024] 2. High proportioning accuracy and strong product quality stability: This invention uses a mass flow meter to collect material conveying data in real time, realizing the linkage control of the main material conveying volume and the addition of auxiliary materials, accurately matching the preset formula parameters, and avoiding manual weighing errors; at the same time, combined with online concentration monitoring and real-time adjustment, it ensures that the material proportions are always within the qualified range, and the product quality fluctuation error is controlled within ±0.2%, significantly improving stability.

[0025] 3. Low pollution risk and low waste liquid generation: This invention achieves fully automated control, reducing environmental impurities caused by human intervention; at the same time, through online real-time concentration monitoring, only one sampling verification is required after the concentration stabilizes. Compared with the traditional method of 3-5 sampling and testing, the number of sampling times is reduced by more than 80%, and the amount of sampling waste liquid generated is greatly reduced, which saves raw materials and reduces environmental treatment costs; in addition, the use of clean sampling boxes further isolates environmental pollution during the sampling process, which is especially suitable for products with high purity requirements such as electronic chemicals.

[0026] 4. Convenient operation and high safety: This invention achieves full-process automated control through a PLC control system. Operators only need to complete the input of formula parameters and final sampling verification, which greatly reduces labor intensity. At the same time, the setting of real-time liquid level monitoring and safety early warning mechanism can effectively avoid safety hazards such as material overflow or empty tank operation, and improve the safety and reliability of the mixing process. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the mixing device of this application;

[0028] Figure 2 This is a diagram of the internal structure of the mixer in this application. Detailed Implementation

[0029] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0030] This application provides an automated mixing method for formulated products, combined with... Figure 1 ,

[0031] This embodiment takes the mixing of electronic chemicals (a semiconductor cleaning solution) as an example, and uses the automatic mixing method of the present invention for production. The formulation requirements of the electronic chemical are: the mass ratio of main material A to auxiliary materials B and C is 10:3:1, the concentration range is 18%-22%, and the concentration stability judgment time is 5 minutes. In the closed-loop circulation mixing system, the speed of the stirrer 6 is set to 300 r / min, and the rated flow rate of the circulation pump 5 is 5 m³ / min. 3 / h, the concentration detector 4 has a detection accuracy of ±0.1%, the main material tube 8 has a diameter of 50mm, the auxiliary material tube 9 includes the first auxiliary material tube 91 (diameter 32mm) and the second auxiliary material tube 92 (diameter 15mm), and the clean sampling box 14 has a sterile sealed structure.

[0032] The specific mixing steps are as follows:

[0033] S1: Preset formula parameters, including the mass ratio of main material A to auxiliary materials B and C (10:3:1), the trigger threshold for adding auxiliary material B (triggered when the conveying amount of main material A is 100kg), the trigger threshold for adding auxiliary material C (triggered when the conveying amount of main material A is 200kg), the qualified concentration range (18%-22%), and the concentration stability judgment time (5min), etc., are entered into the PLC control system; Match auxiliary material conveying pipelines: if the addition amount of auxiliary material B is large, match the first auxiliary material pipe 91; if the addition amount of auxiliary material C is small, match the second auxiliary material pipe 92.

[0034] S2: Dynamic conveying and circulation start of main material. The PLC control system starts the circulation pump 5, and the initial solvent (pure water) in the circulation pipeline 2 forms a stable circulation flow field. Subsequently, the control system controls the pneumatic switch valve on the main material pipe 8 to open, and the main material A enters the second inlet 302 of the mixer 3 through the main material pipe 8, and mixes with the initial solvent in the circulation flow field in the mixer 3: first, it is sheared and dispersed by the Pall annular disperser 306 in the first conical cavity 304, and then enters the second open cavity 305 for diffusion mixing. After mixing, it flows back to the mixing tank 1 with the circulation flow field.

[0035] S3: Precise addition of auxiliary materials. The mass flow meter 10 on the main material pipe 8 collects the conveying data of the main material A in real time and feeds it back to the control system. When the cumulative conveying amount of the main material A reaches 100kg, the control system controls the pneumatic switch valve on the first auxiliary material pipe 91 to open, and the auxiliary material B begins to be conveyed. When the cumulative conveying amount of the auxiliary material B reaches 30kg, the corresponding pneumatic switch valve closes. When the cumulative conveying amount of the main material A reaches 200kg, the control system controls the pneumatic switch valve on the second auxiliary material pipe 92 to open, and the auxiliary material C begins to be conveyed. When the cumulative conveying amount of the auxiliary material C reaches 20kg, the corresponding pneumatic switch valve closes.

[0036] S4: Dual dynamic mixing enhancement. When auxiliary material B is added, the control system starts the drive motor 7, and the agitator 6 rotates at a speed of 300r / min to stir and mix the material in the tank. The circulating flow field continues to run. After the material is finely mixed twice by the mixer 3, it is evenly sprayed back to the mixing tank 1 at 270° by the self-powered rotating nozzle 12, forming a multi-mixing effect.

[0037] S5: Real-time online concentration monitoring. The concentration detector 4 detects the concentration of circulating materials in real time and feeds it back to the control system. In the initial stage, the concentration is lower than 18%. The control system appropriately increases the opening of the main material pipe 8 switch valve until the concentration enters the range of 18%-22%. Then, it starts timing to monitor stability.

[0038] S6: Clean environment sampling verification. When the concentration stabilizes in the range of 18%-22% for 5 minutes, the control system issues a sampling prompt. The operator takes a sample through the clean sampling box 14 and sends it for testing. The verification result shows that the concentration is 20.5%, which meets the requirements. After the mixed product is taken out from the finished product tank, the control system controls the circulation pump 5 and the drive motor 7 to stop running, completing the mixing operation.

[0039] In this embodiment, the mixing cycle is shortened by 45% compared to the traditional method, the material ratio accuracy error is ±0.15%, the number of samplings is only 1, the amount of sampling waste liquid generated is reduced by 85%, and the product contamination rate is reduced by 90%, which significantly improves production efficiency and product quality.

[0040] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0042] It should be noted that all directional indications in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0043] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0044] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0045] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0046] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0047] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A method of automatically mixing a formulated product, characterized in that, The method is implemented based on a closed loop circulation mixing system, which comprises a mixing tank (1), a circulation pipeline (2), a mixer (3), a circulation pump (5), a concentration detector (4), a main material pipeline (8), at least two auxiliary material pipelines (9) and a control system, the mixing tank (1) is provided with a stirrer (6), the circulation pipeline (2) is sequentially provided with the circulation pump (5), the mixer (3) and the concentration detector (4) along the liquid flow direction, the main material pipeline (8) is communicated with the mixer (3), the auxiliary material pipeline (9) is communicated with the mixing tank (1), the main material pipeline (8) and the auxiliary material pipeline (9) are both provided with a mass flow meter (10) and a switch valve; the method comprises the following steps: S1: formula parameter presetting, the proportion and the adding amount parameters of each material of the formula product to be produced are input into the control system; S2: main material dynamic conveying and circulation starting, the circulation pump (5) is started to form a circulation flow field of the closed loop circulation mixing system, the switch valve on the main material pipeline (8) is opened by the control system, the main material enters the mixer (3) through the main material pipeline (8), and after being preliminarily mixed with the circulating material in the circulation flow field in the mixer (3), the main material returns to the mixing tank (1) along with the circulation flow field; S3: auxiliary material precise adding, the control system collects the main material conveying amount data in real time through the mass flow meter (10) on the main material pipeline (8), the switch valve opening and closing and the opening degree of each auxiliary material pipeline (9) are controlled in sequence according to the preset formula parameters, and the corresponding amount of auxiliary material is precisely conveyed into the mixing tank (1); S4: double dynamic mixing strengthening, the stirrer (6) is started to stir and mix the materials in the mixing tank (1), and the circulation flow field continuously runs, the materials flow between the mixing tank (1) and the circulation pipeline (2), are secondarily finely mixed when flowing through the mixer (3), and the circulating materials are uniformly sprayed through the self-powered rotary nozzle (12) at the circulation inlet of the mixing tank (1), so that the disturbance of the materials in the tank is strengthened; S5: online concentration real-time monitoring, the concentration of the circulating material is detected in real time through the concentration detector (4) on the circulation pipeline (2), and the detection data is fed back to the control system in real time; S6: clean environment sampling review, when the detection value of the concentration detector (4) is stable in the preset range and lasts for a preset time length, sampling is performed through the clean sampling box (14) communicated with the circulation pipeline (2), and after the material ratio is reviewed and verified to meet the requirements, the circulation pump (5) and the stirrer (6) are closed, and the mixing operation is completed.

2. A method of automatically mixing a recipe product according to claim 1, wherein, In step S2, the mixer (3) is provided with a first conical cavity (304) and a second open cavity (305) along the liquid flow direction, and the first conical cavity (304) is filled with a Powell ring or Taylor ring disperser (306); the main material and the circulating material are preliminarily mixed by shearing and dispersing through the disperser (306) in the first conical cavity (304), and then diffused and mixed in the second open cavity (305) and then merged into the circulation flow field.

3. A method of automatically mixing a formulaic product according to claim 1, wherein, In step S3, the auxiliary material pipe (9) includes a first auxiliary material pipe (91) and a second auxiliary material pipe (92) with different diameters, and the control system selects the auxiliary material pipe (9) with a corresponding diameter to deliver the auxiliary material according to the preset addition amount of the auxiliary material: the auxiliary material with a larger addition amount is delivered through the first auxiliary material pipe (91), and the auxiliary material with a smaller addition amount is delivered through the second auxiliary material pipe (92).

4. A method of automatically mixing a formulaic product as claimed in claim 1, wherein, In step S3, the control system realizes accurate addition of the auxiliary material through linkage control of the mass flow meter (10) and the on-off valve: when the delivery amount of the main material reaches the preset threshold, the control system controls the on-off valve of the corresponding auxiliary material pipe (9) to open, and the mass flow meter (10) on the auxiliary material pipe (9) is used to collect the delivery amount data of the auxiliary material in real time, and when the delivery amount of the auxiliary material reaches the preset value, the control system controls the corresponding on-off valve to close.

5. A method of automatically mixing a formulaic product as claimed in claim 1, wherein, In step S4, the stirring shaft (61) of the stirrer (6) is arranged along the central axis of the mixing tank, and a plurality of blades (62) are arranged on the stirring shaft (61) along the length direction in a staggered manner, and the rotating speed of the stirrer (6) is controlled to be 200-400 r / min.

6. A method of automatically mixing a formulaic product as defined in claim 1, wherein, In step S5, the detection accuracy of the concentration detector (4) is ±0.1%, and the control system judges whether the detection data is within the preset concentration range in real time, and if the detection data is out of the preset range, the control system adjusts the opening degree of the on-off valve of the corresponding material pipe for material correction.

7. A method of automatically mixing a formulaic product as defined in claim 1, wherein, In step S6, the preset time length is 3-8 min, and the clean sampling box (14) is a sealed sterile structure, and the sampling process is completed in the clean sampling box (14).

8. A method of automatically mixing a formulaic product according to any one of claims 1-7, characterized in that, The mixing tank (1) is provided with a magnetic flap liquid level meter (13), and during steps S2-S4, the control system monitors the liquid level height in the mixing tank (1) in real time through the magnetic flap liquid level meter (13), and when the liquid level height exceeds the preset safety range, the control system issues a warning and controls the corresponding on-off valve to close.

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