Automatic solid chemical diluting device and control method

Abstract

The invention relates to an automatic solid chemical dilution device and a control method, the automatic solid chemical dilution device comprises a dissolving and stirring assembly, a material adding assembly, a pure water supply assembly, a nitrogen supply assembly, a detection and storage assembly and a control system, and the control system is electrically connected with the above assemblies. According to detection data of the liquid level height detection device, the electronic scale and the conductivity concentration meter, the adding amount, the adding speed and the stirring process of pure water and solid chemicals are automatically controlled, automatic deviation correction is executed when the detected concentration deviates from a target, and the diluent is fed into a finished product tank for storage when the concentration of the diluent is qualified. The automatic dilution device for the solid chemicals can realize automatic control of the whole dilution process, ensures the concentration stability and the dissolution uniformity, improves the production efficiency and the safety, and is suitable for the field with high requirements on solution precision and safety.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of chemical analysis, semiconductor wet process or pharmaceutical technology, and particularly relates to the dilution of powdery solid reagents (such as NaOH particles for wafer cleaning, pharmaceutical raw material powder), and specifically relates to an automatic solid chemical dilution device and control method. BACKGROUND

[0002] In the fields of chemical analysis, semiconductor wet process, and pharmaceuticals, accurate dilution of solid chemicals is an important step to ensure product quality, process stability, and production safety. Powdery solid chemicals, such as sodium hydroxide (NaOH) particles for wafer cleaning and pharmaceutical raw material powder, usually have high purity and specific chemical properties. During preparation, strict concentration control and sufficient solubility uniformity are required to meet the needs of high-precision processes.

[0003] For a long time, the dilution process of solid chemicals has mainly relied on manual operation. The typical method includes weighing the solid chemicals with a balance or other weighing tools, pouring them into a container, mixing with a certain amount of pure water, and then manually stirring and adjusting according to the concentration detection results. Although this method is simple, it has obvious shortcomings: first, the weighing process is affected by operation habits, environmental conditions, etc., and the weighing error often reaches ±5% or even higher, which is difficult to meet the stringent requirements of high-precision processes for concentration control; second, manual stirring can cause local concentration unevenness, especially when preparing large-volume solutions; in addition, for hygroscopic chemicals (such as KOH) or chemicals with certain toxicity (such as cyanide), manual operation increases the risk of deliquescence, caking, and personnel exposure.

[0004] To improve dilution accuracy and automation level, various technical improvement schemes have been proposed in related fields. For example, patent CN102917778A discloses a solid chemical product dilution control. This scheme pre-distributes a target amount of diluent (such as pure water) in the dilution container, and uses a spraying method to apply the diluent to the solid chemical, allowing it to dissolve to generate a solution of the required concentration, which is then returned to the container. The system combines a weighing device to monitor the container weight in real time, and the controller adjusts the distribution amount of the diluent and the chemical according to the weight change, and provides multiple modes such as timed distribution, single spraying distribution, and multiple spraying distribution, to improve the accuracy of the preparation.

[0005] Although the technology improves automation and precision over manual operation, there are still some limitations in practical application. First, the weighing process is highly dependent on the stability and accuracy of the weighing equipment, and is affected by factors such as changes in environmental temperature and humidity, equipment accuracy limitations, and moisture absorption material quality fluctuations, which may still cause cumulative errors and result in solution concentration deviations. Second, the solution uniformity still relies on traditional stirring methods, and the local concentration unevenness problem has not been fundamentally solved. For hygroscopic or easily caked chemicals, there is a lack of effective moisture-proof and air isolation measures, and the material is still prone to deliquescence during buffering or feeding, affecting the active ingredient content and dissolution stability. Third, there are still deficiencies in the fine control of feeding speed, real-time concentration monitoring, and automatic correction, and once the initial dilution concentration deviates from the target, manual intervention is often required. For toxic or hazardous chemicals, although some direct contact is reduced, there are still risks of personnel exposure in sealed feeding, protective atmosphere isolation, and safe feeding control.

[0006] Therefore, the existing solid chemical dilution technology still cannot fully meet the comprehensive requirements of high precision, high stability and high safety in the fields of chemical analysis, semiconductor wet process and pharmaceuticals in terms of weighing accuracy, dissolution uniformity, moisture-proof protection, feeding control, concentration automatic adjustment and safety protection. SUMMARY

[0007] The present application aims to solve at least one of the problems of the existing solid chemical dilution process relying on manual weighing and stirring, low precision, uneven dissolution, easy deliquescence and caking, and insufficient safety. The present application discloses an automatic solid chemical dilution device and control method integrating liquid level detection, weighing detection, concentration detection, nitrogen protection, cooling, staged feeding and water addition, automatic correction and safety protection, which realizes automatic and accurate feeding of pure water and solid chemicals, intelligent control of dissolution temperature, real-time concentration detection and automatic correction, significantly improves the stability, consistency and safety of the dilution liquid, reduces manual intervention, improves production efficiency, and is suitable for application fields with high requirements for solution precision and safety.

[0008] Therefore, the first purpose of the present application is to provide an automatic solid chemical dilution device, comprising: A dissolution and stirring assembly comprising a dilution tank and a stirring device, the dilution tank is provided with a liquid level height detection device and a temperature sensor for detecting the liquid level height and temperature during the dilution process; A material feeding assembly comprising a feeding tank for storing solid chemicals, an electronic scale connected to the feeding tank, a first pneumatic valve for controlling the falling of solid chemicals, and a guide plate provided with a vibration hammer, and a nitrogen gas interface provided on the feeding tank for flushing nitrogen gas during feeding; A pure water supply assembly for providing pure water for dilution to the dilution tank; nitrogen supply assembly for supplying nitrogen into the dilution tank and the feeding tank; detection and storage assembly including a filter connected to the dilution tank for filtering impurities in the liquid, a magnetic pump for circulation and transmission of the liquid, a sampling box for sampling the liquid, an electric conductivity concentration meter for real-time detection of the concentration of the dilution liquid and feedback to the control system, and a finished product tank for storing the liquid after dilution; The control system is electrically connected with the above-mentioned assemblies, and automatically controls the addition amount, addition speed and stirring process of the pure water and solid chemicals according to the detection data of the liquid level detection device, the electronic scale and the electric conductivity concentration meter, and executes automatic correction when the detected concentration deviates from the target and stores into the finished product tank when the concentration of the dilution liquid is qualified.

[0009] In some examples of the present application, the material guide plate is arranged in a cross-section contraction shape from top to bottom, and the lower end of the material guide plate is connected with the first pneumatic valve through a material guide pipe, a filter screen is arranged at the end of the material guide plate close to the first pneumatic valve, the vibration hammer is arranged at the corresponding position of the filter screen, and two vibration hammers are arranged.

[0010] In some examples of the present application, a feeding port is arranged at the upper end of the feeding tank, a door lock and a door sensor are arranged at the side of the feeding port, the door lock is used to open or close the feeding port, and the door sensor is used to detect the opening and closing state of the feeding port.

[0011] In some examples of the present application, a plurality of capacitive proximity switches are arranged on the dilution tank, part of the capacitive proximity switches are used to send a low liquid level signal when the liquid level is too low, and the other part is used to send a high liquid level signal when the liquid level is too high.

[0012] In some examples of the present application, a cooling assembly is arranged on the dilution tank, which is used to cool the dilution tank when the dilution tank releases heat at a temperature that is too high.

[0013] In some examples of the present application, the pure water supply assembly includes a first pure water tank, a second pneumatic valve and a third pneumatic valve connected with the dilution tank, which are used to provide pure water required for dilution to the dilution tank in stages.

[0014] In some examples of the present application, the nitrogen supply assembly includes a nitrogen tank, the nitrogen tank supplies nitrogen to the dilution tank and the feeding tank through a fourth pneumatic valve and a fifth pneumatic valve respectively, and a pressure reducing valve is arranged on the supply pipeline of the nitrogen tank.

[0015] In some examples of the present application, a drainage assembly is further included, the drainage assembly comprising a second pure water tank and a pure water gun, and the magnetic force pump is provided as two, i.e., a first magnetic force pump and a second magnetic force pump, and the second pure water tank is in communication with the pipeline where the first magnetic force pump is located, the pipeline where the second magnetic force pump is located, and the sampling box.

[0016] A second object of the present application is to disclose a control method of the automatic solid chemical dilution device, applied to the automatic solid chemical dilution device as described above, comprising: detecting the liquid level of the dilution tank and calculating the liquid volume, determining the required amount of pure water and solid chemical to be added according to the concentration value of the last dilution result and the remaining amount of the pipeline; adding pure water and solid chemical to the dilution tank in sequence, and adding the materials under nitrogen protection during the adding process; after completing the feeding, stirring and measuring the concentration of the diluted liquid by the concentration meter, when the concentration is higher than the set range, the device enters the water adding mode again; when the concentration is lower than the set range, the device enters the chemical adding mode again; when the concentration is within the set range, the device enters the standby mode, and the diluted liquid is transported to the finished product tank when the liquid supply condition is met.

[0017] In some examples of the present application, when adding pure water or adding water again, the second pneumatic valve and / or the third pneumatic valve of different flow rates are opened or closed in stages according to the difference between the target amount and the actual amount of pure water; when adding solid chemical or adding chemical again, the feeding is carried out by opening or closing the vibration hammer in stages according to the difference between the target amount and the actual amount of solid chemical; when adding chemical again, the control system first adds a predetermined amount of pure water into the dilution tank, and then adds the required solid chemical into the dilution tank.

[0018] Compared with the prior art, the automatic solid chemical dilution device and the control method have the following advantages: 1. The present application constructs a full-automatic closed-loop control system from material feeding, dissolution, concentration detection to finished product transportation, through the cooperation of liquid level detection, weighing detection and conductivity concentration detection, combined with the strategies of adding water in stages and adding materials in stages, the addition of pure water and solid chemical can not only quickly supplement the liquid volume in the initial stage to meet the required volume for dissolution, but also accurately control the supplement speed and addition amount when approaching the target value, so as to avoid the concentration deviation caused by inertia overshoot or insufficient feeding, and when the concentration is too low, a proper amount of pure water is added in advance to ensure that the addition amount of solid chemical is higher than the advance closing threshold, so as to avoid the situation that the feeding is terminated in advance, and to ensure that the dilution process is stable and continuous, and the concentration adjustment is efficient and accurate, forming a high-precision, repeatable and traceable dilution control mode.

[0019] 2.The application forms a protective atmosphere through the nitrogen supply assembly during feeding and replenishing to prevent hygroscopic or easily reactive chemicals from deliquescing, caking or being contaminated when contacting air, the combination structure of the double vibration hammer and the guide plate and filter screen can realize smooth falling of solid chemicals and accurate control of feeding speed, reduce the risk of residue and instantaneous excess, and simultaneously start the stirring device during feeding to instantly disperse the solid chemicals and accelerate the dissolution speed, avoid caking and uneven dissolution caused by local high concentration, and cooperate with the cooling assembly to automatically intervene when detecting that the temperature exceeds the threshold value, take away the excess heat generated by the dissolution exothermic reaction, prevent decomposition, volatilization or crystallization caused by high temperature, and ensure the quality stability of the diluent and the long-term operation safety of the equipment.

[0020] 3.The application evacuates air and fills liquid through the drainage assembly before starting the magnetic pump to ensure stable starting of the pump body, the exhaust assembly actively exhausts harmful gases and moisture to maintain a micro-negative pressure environment during sampling, feeding and dissolving, reduces the exposure risk of the operator, the display control system, the emergency stop device and the tower lamp signal realize real-time state visualization and emergency intervention, cooperate with the measurement strategy of circulating replacement before concentration detection and multiple sampling for average, effectively eliminate the interference of pipeline residual liquid and accidental fluctuations, and finally realize the solid chemical dilution production process with high dilution accuracy, uniform dissolution, stable temperature control, perfect safety protection and high automation, improve the production continuity and rhythm stability, reduce the maintenance cost and adapt to the harsh requirements of high-end fields such as semiconductors, pharmaceuticals and chemical analysis. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a schematic diagram of the principle of the solid chemical automatic dilution device described in the embodiments of the application. Figure 2 It is a schematic diagram of the dissolution stirring assembly and the cooling assembly in the solid chemical automatic dilution device described in the embodiments of the application. Figure 3 It is a schematic diagram of the material feeding assembly in the solid chemical automatic dilution device described in the embodiments of the application. Figure 4 It is a schematic diagram of the material feeding assembly in the solid chemical automatic dilution device described in the embodiments of the application. Figure 5 It is a schematic diagram of the pure water supply assembly in the solid chemical automatic dilution device described in the embodiments of the application. Figure 6 It is a schematic diagram of the detection and storage assembly, the drainage assembly, the shell assembly and the exhaust assembly in the solid chemical automatic dilution device described in the embodiments of the application. The marks in the figure represent: 100-dissolution stirring assembly; 101-dilution tank; 102-stirring device; 103-liquid level detection device; 104-temperature sensor; 105-capacitive proximity switch; 200-material feeding assembly; 201-feeding box; 202-electronic scale; 203-first pneumatic valve; 204-lead plate; 205-vibration hammer; 206-filter screen; 207-feeding port; 208-door lock; 209-nitrogen interface; 2010-door sensor; 2011-code reader; 300-pure water supply assembly; 301-first pure water tank; 302-second pneumatic valve; 303-third pneumatic valve; 400-nitrogen supply assembly; 401-nitrogen tank; 402-fourth pneumatic valve; 403-fifth pneumatic valve; 404-pressure reducing valve; 500-cooling assembly; 501-cooling water inlet; 502-cooling water outlet; 503-cooling water pipeline; 504-tenth pneumatic valve; 505-eleventh pneumatic valve; 600-detection and storage assembly; 601-filter; 602-first magnetic drive pump; 603-second magnetic drive pump; 604-sampling box; 605-electrical conductivity meter; 606-finished product tank; 607-ninth pneumatic valve; 608-display screen; 609-emergency stop device; 6010-PLC module; 6011-tower lamp; 700-drainage assembly; 701-second pure water tank; 702-pure water gun; 800-exhaust assembly. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0023] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0024] As shown in Figures 1-6 The present application discloses a solid chemical automatic dilution device, comprising: The dissolution stirring assembly 100 comprises a dilution tank 101 and a stirring device 102, and the dilution tank 101 is provided with a liquid level detection device 103 and a temperature sensor 104 for detecting the liquid level and temperature during the dilution process; The material adding assembly 200 includes a feeding tank 201 for storing solid chemicals, an electronic scale 202 connected with the feeding tank, a first pneumatic valve 203 and a guide plate 204 for controlling the falling of the solid chemicals, a vibration hammer 205 arranged on the guide plate 204, and a nitrogen gas interface 209 arranged on the feeding tank 201 for flushing nitrogen gas during the adding; The pure water supply assembly 300 is used for providing pure water for dilution to the dilution tank 101; The nitrogen gas supply assembly 400 is used for supplying nitrogen gas to the dilution tank 101 and the feeding tank 201 for protection; The detection and storage assembly 600 includes a filter 601 connected with the dilution tank 101, a first magnetic pump 602, a second magnetic pump 603, a sampling box 604, a conductivity concentration meter 605, and a finished product tank 606. The filter 601 is used for filtering impurities in the liquid, the first magnetic pump 602 and the second magnetic pump 603 are used for circulating and transmitting the liquid, the sampling box 604 is used for sampling the liquid, the conductivity concentration meter 605 is used for detecting the concentration of the dilution liquid in real time and feeding back to the control system, and the finished product tank 606 is used for storing the liquid after the dilution is completed. The control system is electrically connected with the above assemblies, and according to the detection data of the liquid level detection device 103, the electronic scale 202, and the conductivity concentration meter 605, the adding amount, the adding speed, and the stirring process of the pure water and the solid chemicals are automatically controlled, the automatic correction is performed when the detected concentration deviates from the target, and the finished product tank 606 is used for storing the dilution liquid when the concentration is qualified.

[0025] The solid-state chemical automatic dilution device described in the application comprises a dissolution and stirring assembly 100, a material feeding assembly 200, a pure water supply assembly 300, a nitrogen supply assembly 400, a detection and storage assembly 600, and a control system. The dissolution and stirring assembly 100 comprises a dilution tank 101 and a stirring device 102. The dilution tank 101 is internally provided with a liquid level detection device 103 and a temperature sensor 104. The liquid level detection device 103 can adopt a radar liquid level meter, or an electronic scale can be installed on the dilution tank 101 instead, for measuring the liquid level of the dilution tank 101 and then calculating the liquid mass. The temperature sensor 104 is arranged at the bottom of the dilution tank 101, for obtaining the temperature information of the liquid in the dilution tank 101 in real time. The material feeding assembly 200 comprises a feeding tank 201 for storing solid-state chemicals, an electronic scale 202 connected with the feeding tank 201, a first pneumatic valve 203 located at the bottom of the feeding tank 201, and a guide plate 204 arranged inside the feeding tank 201. The guide plate 204 is provided with a vibrating hammer 205 for controlling the falling speed of the solid-state chemicals. The feeding tank 201 is provided with a nitrogen gas interface 209 for introducing nitrogen gas to form a protective atmosphere during the feeding process. The pure water supply assembly 300 is used to provide the dilution tank 101 with controllable flow pure water. The nitrogen supply assembly 400 provides continuous or intermittent nitrogen protection for the dilution tank 101 and the feeding tank 201. The detection and storage assembly 600 comprises a filter 601, a first magnetic pump 602, a second magnetic pump 603, a sampling box 604, a conductivity concentration meter 605, and a finished product tank 606, which are in communication with the dilution tank 101. The filter 601 is used to remove particulate impurities in the dilution liquid. The conductivity concentration meter 605 is used to detect the concentration of the dilution liquid in real time and transmit the data to the control system. The control system receives the signals of the liquid level detection device 103, the electronic scale 202, and the conductivity concentration meter 605, determines the required pure water and solid-state chemical feeding amount through calculation, automatically controls the pure water supply assembly 300 and the material feeding assembly 200 to perform water feeding and material feeding, and controls the stirring device 102 to realize uniform mixing. When the concentration deviates from the set value, the feeding amount of pure water or solid-state chemicals is automatically adjusted for concentration correction. When the concentration detection is qualified, the magnetic pump is controlled to deliver the dilution liquid to the finished product tank 606 for storage for subsequent use.

[0026] The solid chemical automatic dilution device described in the application realizes full-process automatic control of pure water and solid chemical dosing by combining liquid level detection, weighing detection and concentration detection, effectively avoids the large error caused by manual weighing and dosing, nitrogen protection can prevent hygroscopic or easily reacting solid chemicals from deliquescence and caking during the dosing process, ensure the stability of the material composition, the design of the vibration hammer 205 can realize rapid, deceleration and micro-precision dosing, avoid the concentration deviation caused by instantaneous excess, the stirring device 102 cooperates with temperature monitoring to ensure uniformity of dissolution, the real-time monitoring and automatic correction function of the conductivity concentration meter 605 can correct the concentration deviation in the dilution process, ensure that the output solution concentration is stable within the target range, the filter 601 can effectively remove impurities in the dilution liquid to prevent subsequent equipment from being blocked or contaminated, the overall design reduces manual intervention, improves production efficiency, improves dilution precision and solution consistency, and effectively reduces the risk of operators contacting dangerous chemicals in safety, and is suitable for application scenarios with high solution precision requirements such as chemical analysis, semiconductor wet process and pharmaceuticals.

[0027] As a preferred example of the present application, the material guide plate 204 is arranged in a cross-section contraction shape from top to bottom, and the lower end of the material guide plate 204 is connected with the first pneumatic valve 203 through a material guide pipe, a filter screen 206 is arranged at the end of the material guide plate 204 close to the first pneumatic valve 203, the vibration hammer 205 is arranged at the corresponding position of the filter screen 206, and two vibration hammers 205 are arranged. In the example of the present application, the material guide plate 204 adopts a cross-section contraction structure from top to bottom, which can utilize gravity and contraction guiding effect to facilitate smooth downward movement of solid chemicals, reduce residual amount on the material guide plate 204, and the filter screen 206 can effectively intercept large particle impurities or lumps in the chemicals during the dosing process, prevent them from entering the first pneumatic valve 203 and the dilution tank 101, affect the dissolution uniformity and equipment operation safety, and the two vibration hammers 205 located at the corresponding position of the filter screen 206 can transmit the vibration generated when starting work to the filter screen 206 and the surrounding material guide plate 204, so that the accumulated chemicals are shaken off and smoothly pass through the filter screen 206 into the material guide pipe, then accurately enter the dilution tank 101 through the opening of the first pneumatic valve 203 to complete the subsequent dilution process. The design of double vibration hammers 205 enables the material dosing assembly 200 to adjust the vibration state as needed, realizes phased precise control of feeding, reduces dosing error, and overall improves the stability and accuracy of the solid chemical dosing process, providing reliable guarantee for the smooth progress of the subsequent dilution process and the precise control of the dilution liquid concentration.

[0028] As a preferred example of the present application, the feeding box 201 is also provided with a feeding port 207 at the upper end, and a door lock 208 and a door sensor 2010 are arranged on the side of the feeding port 207. In the example of the present application, by arranging the feeding port 207 at the upper end of the feeding box 201, it is convenient for the operator to add solid chemicals into the feeding box 201, avoiding the risk of pollution caused by the need to disassemble or temporarily open other parts due to the lack of a dedicated feeding port. The door lock 208 arranged on the side of the feeding port 207 can effectively lock the feeding port 207 in a non-feeding state, preventing the feeding port 207 from being accidentally opened due to external force or operation error during equipment operation, causing the exposure and leakage of solid chemicals, affecting the quality of materials and the safety of operation. At the same time, the door sensor 2010 can monitor the opening and closing state of the feeding port 207 in real time, and immediately feedback to the control system when the feeding port 207 is in an open or unlocked state, so as to facilitate the system to take corresponding safety measures or prompt the operator to make adjustments. When it is necessary to supplement solid chemicals, the operator issues an unlocking instruction through the control system to release the locking state of the feeding port 207 by the door lock 208, and then manually or with the help of auxiliary tools opens the feeding port 207 to add materials into the feeding box 201. After the addition is completed, the feeding port 207 is closed and re-locked by the door lock 208, ensuring that it remains closed in the subsequent operation process. In some examples of the present application, a code reader 2011 is arranged near the feeding port 207, which is used to scan the identification on the chemical package when the operator adds solid chemicals into the feeding box 201, quickly obtaining the key information such as the type, concentration, batch number, etc. of the chemicals. These information will be automatically transmitted to the control system, without the need for manual input, reducing the error rate of information input, and at the same time enabling the control system to automatically adjust the dilution parameters according to the read information, ensuring that the dilution process matches the characteristics of the added chemicals.

[0029] By the cooperation of the feeding port 207 and the door lock 208 and the door sensor 2010, the present application greatly improves the feeding efficiency of solid chemicals, reduces the additional time consumption and pollution risk caused by disassembling parts for feeding, and the addition of the door lock 208 enables the feeding port 207 to be reliably closed in a non-feeding state, effectively avoiding safety hazards such as the deliquescence of hygroscopic chemicals in the air or the leakage of toxic chemicals. The real-time monitoring function of the door sensor 2010 enables the system to perceive the abnormal state of the feeding port 207 in the first time, and intervene through alarm or automatic control, preventing the equipment from continuing to run in an open or unlocked state and causing accidents or material quality problems, improving the operation safety and automation level, reducing the risk caused by human error, and at the same time ensuring the stability of the overall equipment operation and the continuity of the production process while ensuring the safety of solid chemical storage and feeding.

[0030] As a preferred example of the present application, a plurality of capacitive proximity switches 105 are also provided on the dilution tank 101, wherein part of the capacitive proximity switches 105 are used to send a low liquid level signal when the liquid level is too low, and another part is used to send a high liquid level signal when the liquid level is too high. In the example of the present application, by arranging a plurality of capacitive proximity switches 105 on the dilution tank 101, a redundant safety protection for the radar liquid level meter (liquid level height detection device 103) is formed, which serves as a backup monitoring device under normal operating conditions and does not need to participate in liquid level control. When the radar liquid level meter fails due to signal loss detection delay or measurement deviation, etc., the capacitive proximity switches 105 can immediately take over the liquid level monitoring task, and through real-time feedback of the liquid level state to the control system, timely liquid level protection is achieved. As a preferred example of the present application, the capacitive proximity switches 105 are designed as five, respectively LS10-14, wherein the proximity switches LS10 and LS11 located at the low liquid level position send a low liquid level signal when the liquid level approaches the critical point of air suction, causing the control system to quickly shut down the related pumps and valves to prevent damage caused by dry running or air suction. The proximity switches LS13 and LS14 located at the high liquid level position send a high liquid level signal when the liquid level approaches the boundary of overflow, prompting the control system to close the water inlet valve or start the overflow protection to prevent liquid overflow and environmental pollution, thereby significantly improving the stability and safety of the dilution process, preventing equipment damage, production interruption and safety accidents caused by abnormal liquid level, and ensuring production continuity and stability of the dilution liquid quality.

[0031] As a preferred example of the present application, a cooling assembly 500 is provided on the dilution tank 101, which is used to cool the dilution tank 101 when the dilution tank 101 has a too high exothermic temperature. In the example of the present application, the cooling assembly 500 includes a cooling water pipeline 503, one end of which is provided with a cooling water inlet 501 and the other end is provided with a cooling water outlet 502. A tenth pneumatic valve 504 is provided on the cooling water pipeline 503 near the cooling water inlet 501, and an eleventh pneumatic valve 505 is provided on the cooling water pipeline 503 near the cooling water outlet 502. By providing the cooling assembly 500, the present application can intervene in time when the temperature in the dilution tank 101 rises due to the exothermic reaction during the solid chemical dilution process, and remove excess heat through the circulation of cooling water to prevent temperature overrun affecting the stability of the dilution process. The tenth pneumatic valve 504 and the eleventh pneumatic valve 505 control the entry and exit of cooling water, respectively, and can be quickly opened or closed under the instruction of the control system to ensure timely response in the cooling process and immediately cut off the water supply when cooling water is not needed, thereby avoiding energy waste and unnecessary cooling water consumption.

[0032] The setting can effectively inhibit the problem of local decomposition or uneven dissolution of chemicals caused by temperature surge, maintain the diluent in a suitable temperature range, facilitate the full and uniform dissolution of chemicals, improve the quality of diluent and prolong the service life of the equipment, and is particularly suitable for high-end manufacturing fields such as semiconductor process and pharmaceutical raw material dissolution with extremely high requirements for temperature control accuracy, significantly improves production stability, reduces maintenance cost and reduces safety hazards.

[0033] As a preferred example of the present application, the pure water supply assembly 300 includes a first pure water tank 301, a second pneumatic valve 302 and a third pneumatic valve 303 communicating with the dilution tank 101, for providing pure water required for dilution to the dilution tank 101 in stages. In the example of the present application, the pure water supply assembly 300 controls the water replenishment process in stages through two pneumatic valves, realizes rapid water replenishment with large flow rate at the initial stage of dilution to quickly build the basic liquid volume to meet the volume requirement of dissolving solid chemicals, and automatically switches to small valve alone water replenishment volume when approaching the target volume until reaching the set target volume, realizing staged flow control and automatic adjustment of the water replenishment process, shortening the overall dilution time and improving the dilution efficiency, so that the dilution operation can adapt to the requirements of water replenishment speed and accuracy at different stages, taking into account the goals of high efficiency and precision, and ensuring smooth and accurate liquid volume change at each stage.

[0034] As a preferred example of the present application, the nitrogen gas supply assembly 400 includes a nitrogen gas tank 401, which supplies nitrogen gas to the dilution tank 101 and the feeding tank 201 through the fourth pneumatic valve 402 and the fifth pneumatic valve 403 respectively, and a pressure reducing valve 404 is arranged on the supply pipeline of the nitrogen gas tank 401. In the example of the present application, the gas output by the nitrogen gas tank 401 of the nitrogen gas supply assembly 400 is supplied to the dilution tank 101 and the feeding tank 201 after the pressure is stabilized by the pressure reducing valve 404, forming a slightly positive pressure environment during the feeding and replenishment of solid chemicals, preventing the feeding tank 201 from generating negative pressure to make the chemicals fall smoothly, while in the replenishment stage, the system is automatically unlocked, the nitrogen gas valve is opened to isolate external air and provide safe air pressure, ensuring that the operator completes the feeding with almost zero contact and closes the valve and locks the feeding port 207 after the feeding is completed or exceeds the time limit, thereby improving the safety, precision and intelligence level of the solid chemical dilution device as a whole, and meeting the strict requirements of high-end applications such as semiconductors and pharmaceuticals for chemical purity and operation safety.

[0035] As a preferred example of the present application, the solid-state chemical automatic dilution device further comprises a drainage assembly 700, which comprises a second pure water tank 701 and a pure water gun 702, and the second pure water tank 701 can communicate with the pipeline where the first magnetic force pump 602 is located, the pipeline where the second magnetic force pump 603 is located, and the sampling box 604. In the example of the present application, the drainage assembly 700 communicates with the magnetic force pump pipeline and the sampling box 604 through the second pure water tank 701, and liquid is injected into the pump inlet and the associated pipeline to exhaust air before the system starts the magnetic force pump, so as to ensure that the pump is successfully started under the condition that the pump has no suction force. At the same time, the second pure water tank 701 in the drainage assembly 700 also communicates with the pure water gun 702, which is used for cleaning and flushing of the equipment in the system. Residual chemicals can be flushed or the liquid in the sampling box 604 can be replaced during pipeline cleaning, so that the system pipeline remains clean and the concentration of the detection liquid is not disturbed by residual liquid. This design not only reduces the risk of magnetic force pump start-up failure and prolongs the service life of the pump, but also ensures that the residual liquid is replaced in time during pipeline cleaning and sampling, thereby improving detection accuracy and dilution liquid quality.

[0036] As a preferred example of the present application, the solid-state chemical automatic dilution device further comprises an exhaust assembly 800 for micro-negative pressure in the area where the sampling box 604 or the circulating detection device is located. In the example of the present application, the exhaust assembly 800 comprises a fan, an exhaust pipe, and a gas detection linkage device. During the dilution operation such as solid-state chemical feeding, dissolution, and sampling, harmful gases and humid air generated in the area where the dilution tank 101, the feeding area, or the sampling box 604 or the circulating detection device is located are actively exhausted, so that the internal part of the device maintains a micro-negative pressure state, avoids volatile chemicals from escaping to the external environment, and simultaneously replaces air with the nitrogen protection system to balance air pressure and prevent the dilution tank 101 from swelling or liquid from splashing out. This design effectively reduces the risk of operators contacting harmful gases, controls the humidity of the dilution environment, and stabilizes the dilution process, so that the dilution operation is upgraded from the traditional state which is easily affected by gas accumulation, humidity fluctuation, and pressure anomaly to a safe, clean, and controllable standardized process, which not only guarantees the health of personnel but also maintains product purity.

[0037] As a preferred example of the present application, the solid chemical automatic dilution device further comprises a display screen 608, an emergency stop device 609, a PLC module 6010, a tower light 6011, etc. The display screen 608 is used to visually present the equipment state and operating parameters. The emergency stop device 609 is used to shut down the equipment in an emergency working condition. The PLC module 6010 is used as a control core to schedule the cooperation of various components. The tower light 6011 uses light signals to warn the equipment state. In the example of the present application, the display screen 608 displays the equipment parameters (such as liquid level, concentration, temperature) and process state in real time. The emergency stop device 609 stops the equipment by one-key power-off in case of danger. The PLC module 6010 receives sensor data and automatically controls the valve, pump, stirring and other components. The tower light 6011 uses red / yellow / green light to layer warning (such as red light for failure, green light for running), realizing the closed loop of "visual monitoring + emergency intervention + intelligent scheduling + state warning".

[0038] The solid chemical automatic dilution device described in the present application, as shown in Figure 1 , wherein some parts and functions are designed as follows: 1. Electronic scale LC01 for weighing solid chemicals; 2. Agitator AG01 for stirring solid chemicals to accelerate dissolution; 3. Cooling assembly for cooling the heat-releasing chemicals through cooling water in and out; 4. Capacitive proximity switch LS10-14 for measuring the liquid level of the dilution tank. LS10 and LS11 are mainly to prevent the liquid level from being emptied after the radar liquid level meter fails. LS13 and LS14 are to prevent the liquid level from being too full after the radar liquid level meter fails. 5. Temperature sensor TT01 for measuring the temperature of the storage tank; 6. Radar liquid level meter RS01 (or an electronic scale can be installed on the dilution tank instead) for measuring the liquid level height of the dilution tank, and then calculating the liquid mass; 7. Pneumatic valve AV01-11 for controlling the flow of liquid; 8. Leakage sensor KS01-03 for detecting leakage; 9. Magnetic pump MP01-02 for measuring the circulation and transmission of dilution liquid; As a preferred example of the present application, the power supply is designed as AC380V 50HZ 9KW, the compressed air is set to 0.6-1Mpa, the exhaust is set to -150~-300Pa, the resistivity of pure water is ≥18MΩ.cm, the nitrogen gas is set to 0.3-1Mpa with a purity of 5N or above, and the environmental temperature is 22℃±2℃.

[0039] The solid chemical automatic dilution device disclosed in the application realizes full-process automatic control of pure water and solid chemicals through the synergistic effect of liquid level detection, weighing and concentration detection, effectively avoids manual feeding errors, prevents hygroscopic or easily reactive chemicals from deliquescing, caking or being contaminated during feeding and storage through nitrogen protection, realizes accurate feeding in stages through the cooperation of the self-top-to-bottom cross-section contraction structure of the guide plate 204, the filter screen 206 and the double vibration hammer 205, ensures smooth falling, minimal residue and avoids concentration deviation caused by instantaneous excess, the cooling assembly 500 can timely remove excess heat generated by exothermic reaction during the dilution process, maintains stable liquid temperature, the pure water supply assembly 300 meets the needs of rapid water replenishment and accurate water replenishment through staged flow control, the nitrogen supply assembly 400 realizes micro-positive pressure or protective atmosphere, ensures smooth feeding of materials and balance of air pressure in the device, the drainage assembly 700 ensures smooth start of the magnetic pump and cleanliness of the system pipeline, the exhaust assembly 800 actively exhausts harmful gases and humid air in the micro-negative pressure environment, the display and control device, the emergency stop device, the PLC module and the tower lamp provide intelligent monitoring, emergency intervention and operation state visualization, so that the entire dilution process realizes efficient, accurate, safe and clean automatic operation, significantly improves the consistency of the diluent and the product purity, reduces the risk of operators contacting dangerous chemicals, is suitable for high-end application scenarios such as semiconductors, pharmaceuticals and chemical analysis with extremely high requirements for solution accuracy, temperature control and safety, and realizes standardization, intelligentization and full-process automation of solid chemical dilution operation.

[0040] The application also discloses a solid chemical automatic dilution device control method, which comprises the following steps of: S1: dilution initialization, detecting the liquid level in the dilution tank 101 and calculating the current liquid volume, combining the concentration value of the last dilution result and the remaining amount of the pipeline to calculate the required amount of pure water and solid chemicals; S2: adding pure water, when the difference between the calculated pure water target amount and the current actual amount is greater than a preset first closing threshold, simultaneously opening the second pneumatic valve 302 and the third pneumatic valve 303; when the difference is less than or equal to the first closing threshold and greater than a second closing threshold, closing the second pneumatic valve 302; when the difference is less than or equal to the second closing threshold, closing the third pneumatic valve 303, wherein the first closing threshold is greater than the second closing threshold, and the flow in the flow path where the second pneumatic valve 302 is located is greater than the flow in the flow path where the third pneumatic valve 303 is located; S3: Reinforced solid chemicals, open the first pneumatic valve 203 during the feeding process, open the fifth pneumatic valve 403 at the same time to fill nitrogen into the feeding tank 201, detect the remaining amount in the feeding tank 201, when the difference between the target amount and the actual amount of solid chemicals is greater than the first solid chemical closing amount, two vibration hammers 205 are opened at the same time; when the difference is less than or equal to the first solid chemical closing amount and greater than the second solid chemical closing amount, one vibration hammer 205 is closed; when the difference is less than or equal to the second solid chemical closing amount, two vibration hammers 205 are closed at the same time, and then the first pneumatic valve 203 is closed, wherein the first solid chemical closing amount is greater than the second solid chemical closing amount; S4: Stirring, timing starts from the completion of adding solid chemicals, and stirring ends after a preset time T1; S5: Measurement, the dilution liquid is driven by the magnetic pump to flow through the conductivity meter 605 and a pre-measurement cycle is performed, and when the pre-measurement cycle time T2 is reached, the average value of multiple samples of the conductivity meter 605 is taken as the dilution liquid concentration, and it is judged whether the dilution liquid concentration is within the set concentration range; S6: According to the dilution liquid concentration measurement result, enter standby mode, re-add water mode or re-add chemical mode, and repeat steps S2 to S5 under the condition that re-adding does not exceed the preset number of times; S7: When receiving a liquid supply request signal in standby mode, open the transfer valve and the magnetic pump to supply liquid to the finished product tank 606, and re-enter the dilution initialization S1 when the liquid level of the dilution tank 101 is lower than the preset value.

[0041] The solid chemical automatic dilution device control method disclosed in the present application takes real-time detection of liquid level and concentration as the core, calculates the target water supplement amount and the solid chemical feeding amount in the initialization stage, accurately controls the addition amount of pure water and solid chemicals in stages, and combines the double-valve flow difference switching to realize a fast supplement and accurate supply combined water adding mode and a double-vibration hammer staged driving to realize a large-flow impact feeding and small-flow fine-tuning combined feeding mode, ensuring the balance of feeding speed and accuracy, ensuring the full dissolution of chemicals in the stirring stage, and effectively eliminating accidental errors by pre-measurement cycle replacement of pipeline residual liquid and multiple sampling in the measurement stage, so as to obtain more accurate dilution liquid concentration value. The system automatically selects water and chemicals or directly supplies liquid according to the concentration result, and prevents over-circulation in the adjustment process through the preset number of times, finally realizes a full-automatic closed-loop control mode with concentration standard as the core, significantly reduces manual intervention, and improves dilution accuracy and operation efficiency.

[0042] As a preferred example of the present application, in step S1, the liquid level is detected by a radar wave liquid level meter, and the liquid volume V=π*r 2h, combined with the liquid specific gravity p, the liquid weight W = V * p is calculated, according to the concentration value of the last dilution result and the existing liquid amount in the dilution tank 101 and the residual amount of the pipeline, the chemical adjustment amount required for neutralizing the last concentration deviation is calculated, and the pure water amount and the solid chemical amount required to be added are determined according to the dilution target amount and the solid chemical concentration. The present application realizes the accurate calculation of the liquid volume and weight by combining the liquid level measurement, the tank geometry parameters and the liquid specific gravity, wherein V is the volume of the dilution tank 101, r is the radius of the dilution tank 101, and h is the height of the dilution tank 101. On this basis, the last dilution concentration result and the residual liquid in the pipeline are comprehensively considered to accurately determine the increase or decrease of the chemical required to correct the concentration deviation, and then the accurate proportioning calculation is carried out according to the dilution target amount and the solid chemical concentration, so as to ensure that the calculation of water and material addition amount is not dependent on empirical estimation but based on real-time physical measurement and concentration feedback, reducing the problem of inaccurate proportioning caused by human judgment error, making the dilution process have the characteristics of accuracy, repeatability and traceability in the initial stage.

[0043] As a preferred example of the present application, in step S3, when it is detected that the remaining amount of solid chemicals in the feeding box 201 is less than the required increase amount calculated this time, the control system triggers a filling reminder signal to prompt the operator to supplement the solid chemicals in time. The present application introduces the comparison between the remaining amount and the required amount in the step of adding solid chemicals, and immediately sends a filling reminder to the operator when it is detected that the solid chemical storage in the feeding box 201 is insufficient to meet the requirements of this dilution, so as to avoid the termination of the material addition or the inaccurate proportioning caused by insufficient chemicals, ensure the continuity of the dilution process and the stability of the formula, and reduce the energy consumption and time waste caused by equipment idling, abnormal shutdown and subsequent repeated start caused by material depletion. It is helpful to plan the material supply in advance and reduce the risk of production interruption. In the example of the present application, when supplementing the solid chemicals to the feeding box 201, the operator needs to confirm the addition operation through the touch screen and can only execute the addition in the non-material addition running state of the system. After the system receives the addition instruction, it automatically unlocks the door lock 208 of the feeding port 207 and opens the nitrogen interface 209 to block the external gas from entering the feeding box 201. After completing the material addition and confirmation, it automatically locks the door lock 208 of the feeding port 207 and closes the nitrogen interface 209. By sending a prompt alarm in the low material level state of the solid chemicals and setting the operation permission of the touch screen for confirming the material addition, the present application effectively prevents the material flow from being disturbed or the equipment from being damaged due to misoperation in the automatic material addition running of the system. At the same time, combined with the automatic linkage of the door lock 208 of the feeding box 201 and the nitrogen protection, the present application not only ensures the safety and sealing of the material addition process, but also avoids the risk of moisture and moisture of the chemicals caused by the entry of external air or moisture into the feeding box 201, thereby ensuring the stability and consistency of the quality of the chemicals in the subsequent dilution process.

[0044] As a preferred example of the present application, in step S3, the control system first adds a predetermined amount of pure water into the dilution tank 101, and then adds the required solid chemical into the dilution tank 101. By preferentially adding a certain amount of pure water when the concentration is low, the present application ensures that the target addition amount of the subsequent solid chemical is significantly higher than the second solid chemical addition closing amount (advance closing threshold), thereby avoiding the premature termination of the feeding process due to an excessively small addition amount, ensuring the integrity and accuracy of the feeding process, reducing the number of stirring and detection caused by repeated small-dose additions, and improving the stability and concentration adjustment efficiency of the dilution process.

[0045] As a preferred example of the present application, in step S3, the stirring device 102 is started to operate simultaneously with the addition of the solid chemical into the dilution tank 101. By simultaneously starting the stirring device 102 when adding the solid chemical, the present application ensures that the chemical is uniformly dispersed in the liquid as soon as it enters the dilution tank 101, avoiding the formation of high-concentration local solutions that slow down the dissolution rate or cause caking. At the same time, by continuously flowing the liquid to increase the solid-liquid contact area and mass transfer efficiency, the dilution reaction process is more rapid and stable, effectively shortening the dissolution time and reducing energy consumption, and reducing the risk of pipeline or pump body blockage caused by solid deposition.

[0046] As a preferred example of the present application, in step S3, when the temperature sensor 104 of the dilution tank 101 detects that the temperature inside the dilution tank 101 exceeds the preset value, the cooling assembly 500 is automatically started to cool the dilution tank 101 with cooling water. By monitoring the temperature of the dilution tank 101 in real time during the addition of the solid chemical, and automatically starting the cooling assembly 500 when the temperature exceeds the safety threshold, the present application effectively removes the heat released during the dissolution reaction process, thereby effectively preventing the decomposition of the chemical, the degradation of performance, or the damage to the equipment components caused by the high temperature of the liquid in the dilution tank 101. At the same time, the present application avoids the intensification of solution volatilization or local supersaturation crystallization caused by high temperature, ensuring the temperature stability of the dissolution process and the consistency of product quality.

[0047] As a preferred example of the present application, in step S5, first open the fifth pneumatic valve 403 and the pneumatic valve of the pipeline where the conductivity concentration meter 605 is located, delay for a time T3, then start the first magnetic pump 602 or the second magnetic pump 603 to perform the pre-measurement circulation, and after reaching the pre-measurement circulation time T2, collect the concentration meter reading every preset time T4, and take the average value of the four consecutive readings as the measurement result. In the example of the present application, T3 is 5 seconds, T4 is 15 seconds, and two conductivity concentration meters 605 are provided, corresponding to the seventh pneumatic valve AV07 and the eighth pneumatic valve AV08 respectively, and the above two pipelines circulate to the dilution tank 101. This setting performs a circulation displacement operation before concentration measurement, so that the liquid in the concentration meter is completely replaced by the liquid in the current dilution tank, avoiding concentration measurement deviation caused by residual liquid or stagnant liquid in the pipeline, and through the set multiple time sampling and average value calculation, effectively eliminating transient fluctuations and accidental errors, ensuring the stability and accuracy of the final measured concentration result, thereby providing a reliable basis for subsequent automatic water addition or material addition adjustment, and improving the precise control ability and product liquid quality stability of the entire dilution process.

[0048] As a preferred example of the present application, in the re-watering mode of step S6, if the difference between the calculated pure water target amount and the actual amount is greater than the first closing threshold, the second pneumatic valve 302 and the third pneumatic valve 303 are opened simultaneously for water addition, when the difference is less than or equal to the first closing threshold and greater than the second closing threshold, the second pneumatic valve 302 is closed, when the difference is less than or equal to the second closing threshold, the third pneumatic valve 303 is closed, and after water addition, it is judged according to the system record whether to enter step S5 measurement or re-chemical addition mode. In the re-watering mode of the present application, the same stage control method of large valve and small valve is adopted, so that the water addition process considers both efficiency and precision. In the initial stage of water addition, the large valve and the small valve are opened simultaneously to realize rapid liquid supplement, and when the target liquid amount is approached, the large valve is automatically closed and only the small valve is left for low-flow precise supplement, thereby effectively avoiding the over-quantity phenomenon caused by water addition inertia, ensuring the high consistency of the final liquid volume and the target value, and combining with the system record to judge whether to enter the dilution liquid concentration measurement or re-chemical addition mode, realizing seamless connection between water addition and subsequent processes, and improving the automation degree and control precision of the entire dilution process.

[0049] As a preferred example of the present application, in the re-chemical adding mode of step S6, the fifth pneumatic valve 403 is opened to fill nitrogen into the feeding tank 201, and it is detected whether the remaining amount in the feeding tank 201 is greater than the increased amount required this time, and if not, a filling reminder signal is sent to prompt the operator to supplement the solid chemical in time; when sufficient, the difference between the target amount and the actual amount of the solid chemical is calculated, when the difference is greater than the first solid chemical closing amount, both vibration hammers 205 are opened; when the difference is less than or equal to the first solid chemical closing amount and greater than the second solid chemical closing amount, one vibration hammer 205 is closed; when the difference is less than or equal to the second solid chemical closing amount, both vibration hammers 205 are closed, and then the first pneumatic valve 203 is closed to enter step S4 stirring. By introducing nitrogen protection and staged feeding strategy in the re-chemical adding mode, the feeding process can prevent the influence of negative pressure in the feeding tank, while considering the feeding speed and feeding accuracy. Nitrogen supplement ensures smooth falling of solid chemicals and avoids the entry of external moisture or impurities. The remaining amount detection and prompt alarm function avoids the interruption of feeding caused by insufficient material. The staged feeding gradually switches from fast to slow using two vibration hammers, effectively reducing the risk of overfeeding in the later stage, making the final chemical feeding amount highly consistent with the target value, providing a stable premise for subsequent stirring and dissolution, thereby improving the reliability and control accuracy of the entire dilution process.

[0050] As a preferred example of the present application, in step S7, when receiving a liquid supply request signal in standby mode, the fourth pneumatic valve 402 and the ninth pneumatic valve 607 of the pipeline where the finished product tank 606 is located are opened first, and after a delay of a preset time T5, the first magnetic pump 602 or the second magnetic pump 603 is started to transfer the dilution liquid. When the liquid level of the dilution tank 101 is lower than the preset re-dilution liquid level, the system automatically switches to the dilution initialization step S1. If the liquid level of the finished product tank 606 has been met and the liquid level of the dilution tank 101 is still higher than the re-dilution liquid level during the transfer process, the system automatically switches to the waiting mode. In the example of the present application, by introducing valve delay for a preset time T5 in the liquid supply stage, the opening and liquid level double condition judgment is realized, which realizes the automatic connection of dilution liquid transportation and subsequent dilution process. The delay start of the magnetic pump can avoid pipeline impact caused by instantaneous pressure fluctuation. The preset time T5 is 5 seconds, which improves the stability of transportation. The liquid level judgment logic ensures that when the liquid level of the dilution tank is insufficient, the re-dilution process is entered first to ensure that the concentration and volume meet the requirements next time. When the liquid level of the finished product tank 606 is met, the system automatically switches to the waiting mode, which can avoid invalid operation and energy waste. The three states of liquid supply, dilution and standby form an efficient closed loop switching under system control, reducing manual intervention and improving the continuity and production rhythm stability of equipment operation.

[0051] The solid chemical automatic dilution device control method described in the present application is applied to the solid chemical automatic dilution device described in the above embodiments. After the device completes overall testing and empty machine commissioning, the formal dilution operation is performed according to the following steps: 1) According to the pre-set dilution parameters, the required amount of solid chemical and pure water is calculated; 2) According to the calculation results, pure water and solid chemical are added in turn, wherein pure water is added first, and the stirrer is started synchronously during the addition of solid chemical to accelerate the dissolution speed of solid chemical; after stirring is completed, the dilution liquid is driven by the circulating pump to flow through the concentration meter for detection, and it is judged whether the measured concentration is within the set concentration range; 3) According to the concentration detection result, different processing logic is executed: when the concentration is within the set range, the device enters standby mode; when the concentration is higher than the set range, the device enters water adding mode again; when the concentration is lower than the set range, a certain amount of pure water is added first (to increase the required amount of solid chemical addition, to avoid being less than the advance shutdown threshold), and then solid chemical is added; 4) After performing secondary water adding or solid chemical adding operation, stirring is started again to complete dissolution, and then the concentration detection mode is entered to re-judge whether the concentration meets the requirements; when the detection result meets the set range, the standby mode is entered; when the detection result still does not meet the requirements, the operation of item 3) is repeated, but the dilution times are limited to three times at most, and when it still does not meet the requirements after three times, the manual processing mode is switched; 5) When the device is in standby mode and the finished product tank issues a liquid supply request, the transmission process is started to deliver the diluted liquid to the finished product tank, and when the liquid level in the dilution tank is lower than the re-dilution liquid level threshold, the next batch of dilution process is automatically entered; 6) For solid chemicals that release heat during dilution, when the temperature detected by the dilution tank temperature sensor exceeds the set threshold, the device automatically starts the cooling water circuit of the cooling assembly to cool the dilution tank; 7) In the design of the magnetic pump, a pure water drainage assembly is provided, so that the dilution tank and the magnetic pump inlet are filled with liquid before starting, to ensure that the magnetic pump can be started normally and run stably.

[0052] The embodiments of the present application are described above in combination with the drawings. In the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other, the present application is not limited to the above specific embodiments, the above specific embodiments are only illustrative, not limiting, and those skilled in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the protection scope of the claims.

Claims

1. A solid chemical automatic dilution device, characterized in that: include: A dissolving and stirring assembly (100) comprises a dilution tank (101) and a stirring device (102), wherein a liquid level detection device (103) and a temperature sensor (104) are provided in the dilution tank (101) for detecting the liquid level and temperature during the dilution process; A material feeding assembly (200) comprises a feeding box (201) for storing solid chemicals, an electronic scale (202) connected to the feeding box, a first pneumatic valve (203) for controlling the drop of the solid chemicals, and a material guide plate (204), a vibration hammer (205) being provided on the material guide plate (204), and a nitrogen interface (209) being provided on the feeding box (201) for flushing nitrogen during feeding; A pure water supply assembly (300) for providing pure water for dilution to the dilution tank (101); A nitrogen supply assembly (400) is used to introduce nitrogen protection into the dilution tank (101) and the feeding box (201); The detection and storage component (600) comprises a filter (601) connected to the dilution tank (101), a magnetic pump, a sampling box (604), a conductivity concentration meter (605) and a finished product tank (606), wherein the filter (601) is used to filter impurities in the liquid, the magnetic pump is used to circulate and transmit the liquid, the sampling box (604) is used to sample the liquid, the conductivity concentration meter (605) is used to detect the concentration of the diluted liquid in real time and feed it back to the control system, and the finished product tank (606) is used to store the diluted liquid; The control system is electrically connected to the above components, and automatically controls the dosage, dosage speed and stirring process of pure water and solid chemicals according to the detection data of the liquid level detection device (103), the electronic scale (202) and the conductivity concentration meter (605). It also performs automatic correction when the detection concentration deviates from the target and passes the diluted liquid into the finished product tank (606) for storage when the concentration is qualified.

2. The solid chemical automatic dilution device according to claim 1, characterized in that: The guide plate (204) is arranged in a cross-sectional contraction shape from top to bottom, and the lower end of the guide plate (204) is connected to the first pneumatic valve (203) through a guide pipe. A filter screen (206) is provided at the end of the guide plate (204) close to the first pneumatic valve (203), and the vibration hammer (205) is provided at a position corresponding to the filter screen (206), and two vibration hammers (205) are provided.

3. The solid chemical automatic dilution device according to claim 1, characterized in that: A feeding port (207) is provided at the upper end of the feeding box (201), and a door lock (208) and a door sensor (2010) are provided on the side of the feeding port (207). The door lock (208) is used to open or close the feeding port (207), and the door sensor (2010) is used to detect the open or closed state of the feeding port (207).

4. The solid chemical automatic dilution device according to claim 1, characterized in that: A plurality of capacitive proximity switches (105) are provided on the dilution tank (101), wherein at least one capacitive proximity switch (105) is used to send a low liquid level signal when the liquid level is too low, and at least one capacitive proximity switch (105) is used to send a high liquid level signal when the liquid level is too high.

5. The solid chemical automatic dilution device according to claim 1, characterized in that: A cooling assembly (500) is provided on the dilution tank (101), and the cooling assembly (500) is used to cool the dilution tank (101) when the dilution exothermic temperature of the dilution tank (101) is too high.

6. The solid chemical automatic dilution device according to claim 1, characterized in that: The pure water supply assembly (300) comprises a first pure water tank (301), a second pneumatic valve (302) and a third pneumatic valve (303) in communication with the dilution tank (101), and is used to supply the pure water required for dilution to the dilution tank (101) in stages.

7. The solid chemical automatic dilution device according to claim 1, characterized in that: The nitrogen supply assembly (400) comprises a nitrogen box (401), which supplies nitrogen to the dilution tank (101) and the feeding box (201) respectively through a fourth pneumatic valve (402) and a fifth pneumatic valve (403), and a pressure reducing valve (404) is provided on the supply pipeline of the nitrogen box (401).

8. The solid chemical automatic dilution device according to claim 1, characterized in that: It also includes a drainage component (700), which includes a second pure water tank (701) and a pure water gun (702). Two magnetic pumps are provided, namely a first magnetic pump (602) and a second magnetic pump (603). The second pure water tank (701) can be connected to the pipeline where the first magnetic pump (602) is located, the pipeline where the second magnetic pump (603) is located, and the sampling box (604).

9. A control method for a solid chemical automatic dilution device, characterized in that: The automatic dilution device for solid chemicals as claimed in any one of claims 1 to 8 comprises: Detect the liquid level in the dilution tank and calculate the liquid volume. Determine the amount of pure water and solid chemicals required to be added based on the concentration value of the previous dilution result and the remaining volume in the pipeline; Add pure water and solid chemicals to the dilution tank in sequence, and dosing is carried out under nitrogen protection during the addition process; After the addition is completed, the device is stirred and the dilution concentration is measured by a concentration meter. When the concentration is higher than the set range, the device enters the water re-addition mode; when the concentration is lower than the set range, the device enters the chemical re-addition mode; when the concentration is within the set range, the device enters the standby mode and delivers the dilution to the finished product tank when the liquid supply conditions are met.

10. The control method of the solid chemical automatic dilution device according to claim 9, characterized in that: When adding pure water or in the water re-adding mode, the second pneumatic valve and / or the third pneumatic valve with different flow rates are opened or closed in stages according to the difference between the target amount and the actual amount of pure water; when adding solid chemicals or in the chemical re-adding mode, the vibrating hammer is opened or closed in stages for adding materials according to the difference between the target amount and the actual amount of solid chemicals. In the chemical re-adding mode, the control system first adds a predetermined amount of pure water into the dilution tank, and then adds the required solid chemicals into the dilution tank.

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