A dynamic balance linkage method and system for continuous feeding of a hydrogen gas jet mill

Abstract

The present application relates to a kind of hydrogen broken gas flow mill continuous feeding dynamic balance linkage method and system, it is related to magnetic material manufacturing field, it includes: after vacuum cooling, start to send powder to gas flow mill, and the inert gas flow of inert gas is obtained in transition bin in real time and the powder feed amount;With sampling method, the particle size value of powder is detected in real time, and the specific surface area of powder is determined according to particle size value;According to unit specific passivation agent consumption, powder feed amount and the specific surface area of powder, the proportion value of passivation agent in inert gas in unit time is determined, and the real-time proportion of passivation agent in inert gas is obtained;According to proportion value and real-time proportion, determine the passivation agent supplement amount;Steam-state passivation agent is injected with passivation agent supplement amount.The present application has the effect of improving the smoothness and stability of powder production between hydrogen broken and gas flow mill.

Description

Technical Field

[0001] This invention relates to the field of magnetic material manufacturing, and in particular to a dynamic balance linkage method and system for continuous feeding of a hydrogen-cooled gas mill. Background Technology

[0002] Hydrogen-crushed air jet milling is a core powder-making process in the production of sintered NdFeB permanent magnets. Through intergranular chemical crushing by hydrogen crushing, the main phase grains of the magnet are completely preserved. Then, through media-free ultrafine crushing and precise sieving by air jet milling, micron-sized finished powder that meets the magnetic performance requirements is obtained. It is currently the only universally applicable industrial powder-making technology route in the industry.

[0003] Currently, the industry generally adopts a production model with independent processes and manual connection. The hydrogen crushing furnace and the air jet mill operate as two completely independent sets of equipment. The powder after hydrogen crushing needs to be manually transferred to the transition silo, and then the transition silo is used to feed the air jet mill.

[0004] Regarding the aforementioned technologies, the existing technologies rely on manual experience to determine the process nodes between hydrogen crushing and air jet milling. The operation of each process is disconnected, and the core process parameters cannot be dynamically adapted to the real-time production conditions. This not only leads to poor production continuity, high risk of powder oxidation, and difficulty in ensuring product quality consistency, but also seriously restricts the large-scale and stable production of high-performance NdFeB magnets. Summary of the Invention

[0005] To improve the smoothness and stability of powder production between hydrogen crushing and air jet milling, this invention provides a dynamic balance linkage method and system for continuous feeding of hydrogen crushing air jet milling.

[0006] In a first aspect, the present invention provides a dynamic balancing linkage method for continuous feeding of a hydrogen-powered gas mill, employing the following technical solution: A dynamic balancing linkage method for continuous feeding of a hydrogen-powered gas jet mill includes: Step 1: In response to the dehydrogenation start signal, the preset furnace pressure value of the hydrogen crushing furnace is detected in real time; Step 2: Analyze the changing pressure values ​​in real time to obtain a pressure curve, extract the slope of the signal curve from the pressure curve, and record the change time in real time. Step 3: When the slope of the signal curve is less than the preset reference slope and continues for a preset duration, dehydrogenation is determined to be complete, and the powder is vacuum cooled. Step 4: After vacuum cooling, start feeding powder into the preset air jet mill, and obtain the inert gas flow rate and powder feeding amount in real time in the preset transition hopper. Step 5: Detect the particle size of the powder in real time using a preset sampling method, and determine the specific surface area of ​​the powder based on the particle size. Step 6: Determine the proportion of passivating agent in inert gas per unit time based on the preset unit ratio of passivating agent dosage, powder feeding rate and powder specific surface area, and obtain the real-time proportion of passivating agent in inert gas. Step 7: Determine the amount of passivating agent to replenish based on the percentage value and the real-time percentage; Step 8: Inject the preset amount of vaporized passivating agent to replenish the passivating agent.

[0007] By adopting the above technical solution, the pressure changes inside the hydrogen crushing furnace can be monitored in real time, and the dehydrogenation reaction end time can be accurately determined by combining the slope change law of the pressure curve, replacing the traditional manual judgment method and improving the control accuracy of process nodes; the passivating agent ratio and addition amount can be adjusted in coordination with the material feed rate and specific surface area to make the passivating agent ratio suitable for the real-time state of the powder and reduce the powder oxidation problem.

[0008] Optional, also includes: Step 11: Real-time monitoring of the pressure value in the transition silo; Step 12: When the pressure value of the transition hopper is not less than the preset wall adhesion pressure, it is defined as powder adhering to the inner wall, and ultrasonic vibration is turned on; Step 13: Control the ultrasonic waves to vibrate at preset intervals and vibration frequencies, and sample the powder within the intervals. Step 1301: When the particle size of the sampled powder is not greater than the preset minimum particle size value, stop the vibration until the particle size of the sampled powder is greater than the minimum particle size value, then resume the interval vibration. Step 1302: Determine the vibration correction frequency based on the preset single vibration time and the minimum particle size of the powder; Step 1303: Correct the vibration frequency using the vibration correction frequency; Step 14: Stop ultrasonic vibration when the pressure value of the transition silo is less than the wall-mounted pressure.

[0009] By adopting the above technical solution, the internal pressure data of the transition silo is monitored in real time. The powder adhesion on the inner wall of the silo is judged by the pressure value change, and ultrasonic vibration is automatically activated for cleaning. During the intermittent operation of ultrasonic vibration, the powder particle size is continuously sampled and detected. If the powder size is too small, the vibration operation is stopped in time to prevent the powder from being broken again. At the same time, the vibration frequency is dynamically adjusted by combining the vibration duration and particle size parameters to adaptively match the wall cleaning requirements. This can not only effectively remove the powder adhering to the wall of the silo and avoid material accumulation and blockage, but also strictly control the powder particle size and ensure stable powder conveying quality.

[0010] Optional, also includes: Step 1311: When the particle size of the sampled powder is not less than the preset maximum particle size, turn on the ultrasonic vibration; Step 1312: Control the ultrasonic vibration to break up the powder within the preset vibration time and at the preset vibration frequency, and record the number of vibrations. Step 1313: When the number of crushing times reaches the preset baseline number, the inert gas is increased by controlling the preset auxiliary flow rate to enhance the collision between powders and assist in crushing large powders; Step 1314: When the number of pulverizations reaches the preset alarm number, stop feeding powder and issue an alarm.

[0011] By adopting the above technical solution, the powder particle size is detected in real time. When the powder particles are too large, ultrasonic waves are activated to crush the large particles. By increasing the inert gas flow rate, the airflow drives the powder to collide with each other, which helps to complete the crushing of large particles. When the abnormality cannot be eliminated after multiple treatments, the feeding is stopped in time and an alarm is issued, which makes it easier for staff to check the problems in the hydrogen crushing process in a timely manner and prevent large particles from entering the air jet mill.

[0012] Optional, also includes: Step 31: Real-time monitoring of ambient temperature and humidity, and recording of the transition hopper pressure, feed rate, and powder particle size each time powder adheres to the inner wall; Step 32: Store the ambient temperature, ambient humidity, transition silo pressure, material conveying rate, and powder particle size in a preset historical database; Step 33: Analyze the historical database to determine the critical range and dangerous range of wall adhesion for each parameter; Step 34: When the pressure value of the transition silo, the conveying rate, the particle size of the powder, the ambient temperature and the ambient humidity are all within the critical range of wall adhesion, increase the flow rate of inert gas to purge; Step 35: When the pressure value of the transition silo, the conveying rate, the particle size of the powder, the ambient temperature and the ambient humidity are all within the dangerous range of wall adhesion, turn on the ultrasonic vibration to prevent it.

[0013] By adopting the above technical solution, data such as ambient temperature and humidity, transition silo pressure, powder conveying volume and particle size are collected simultaneously. All kinds of operating data are stored in a unified historical database for summary and analysis, and the critical range and dangerous range of powder adhesion to the wall are identified. In the critical state, the inert gas flow rate is increased for purging protection, and in the dangerous state, ultrasonic waves are activated in advance for preventive intervention, thereby reducing the probability of powder adhesion to the wall of the transition silo and improving the stability of equipment operation.

[0014] Optional, also includes: Step 41: After the particle size value detection is completed, record the pressure build-up time when the negative pressure in the sampling channel reaches the preset pressure stability value after each sampling is started; Step 42: Generate a pressure build-up trend chart based on the recorded pressure build-up time for each time; Step 43: Analyze the pressure build-up trend chart to obtain the duration trend of pressure build-up time; Step 44: When the long-term trend is consistent with the preset increasing trend, it is determined that there is a wall hanging in the sampling channel, and sampling is suspended; Step 45: Backflush the sampling channel by introducing pulsed inert gas in reverse to backflush the residual powder sample in the sampling channel into the air jet mill. Step 46: After the preset backflush time, resume sampling.

[0015] By adopting the above technical solution, the pressure build-up time required for the negative pressure of the sampling channel to stabilize is recorded. Based on the change in pressure build-up time, it is determined that powder build-up blockage has occurred inside the sampling channel. After detecting the pipeline abnormality, the sampling operation is stopped in time, and the sampling channel is purged in reverse using pulsed inert gas to transport the residual powder in the pipeline back to the air jet mill. After the purging is completed, normal sampling and testing are resumed, which solves the problem of sampling channel blockage, ensures continuous and reliable powder particle size sampling and testing, and avoids deviation in test data caused by pipeline build-up.

[0016] Optionally, when the pressure value of the transition silo is not less than the preset wall-hanging pressure, the steps further include: Step 121: Obtain the segment pressure values ​​corresponding to multiple preset segment positions within the transition silo; Step 122: When the section pressure value is greater than the preset reference pressure value, the section position where the section pressure value is greater than the reference pressure value is defined as the wall hanging position; Step 123: Determine the blowing angle based on the wall position and obtain the number of wall-mounted items at the wall position; Step 124: When the amount of material adhering to the wall is no more than 1, inert gas is introduced at the blowing angle so that the inert gas is blown towards the powder along the inner wall of the transition hopper. Step 125: When the amount of powder adhering to the wall is greater than 1, determine the blowing sequence along the powder flow direction, and fill inert gas in a preset reverse order and blowing angle.

[0017] By adopting the above technical solution, the transition silo is subjected to segmented pressure testing to obtain the pressure values ​​of different silo sections. By comparing the pressure with the benchmark pressure, the specific wall adhesion location can be quickly located. For a single wall adhesion location, fixed-point and directional air blowing is used for cleaning. For multiple wall adhesion locations, air blowing is carried out in reverse order according to the material flow direction. This achieves precise and targeted wall cleaning operations, addressing local wall adhesion problems in a targeted manner, reducing large-scale airflow disturbance, and maintaining stable air pressure and feeding status inside the silo while ensuring the wall adhesion cleaning effect.

[0018] Optional, also includes: Step 51: Obtain the particle size values ​​of the powder from the upper sample in the upper sampling channel of the transition silo and the powder particle size values ​​from the lower sample in the lower sampling channel of the transition silo. Step 52: Calculate the difference between the particle size values ​​of the upper sample powder and the lower sample powder and define it as the stratification difference; Step 53: When the stratification difference is not less than the preset benchmark difference, it is determined that the powder stratification is serious, and the hydrogen crushing furnace is tested using the preset detection method.

[0019] By adopting the above technical solution, sampling channels are set up at the upper and lower positions of the transition silo to collect powder from the upper and lower layers and detect the particle size. The difference in particle size between the upper and lower powders is calculated to determine the degree of material stratification. When the difference in powder stratification is too large, the overall operating status of the hydrogen crushing furnace is detected.

[0020] Optional, also includes: Step 61: Record the particle size of the powder in real time and obtain the average particle size of the powder; Step 62: Determine the pressure increase or decrease based on the comparison between the average particle size and the preset benchmark particle size range; Step 63: Correct the furnace pressure value based on the amount of pressure increase or decrease.

[0021] By adopting the above technical solution, the powder particle size data obtained by continuous statistical testing is used to determine the upward and downward adjustment of the furnace pressure according to the actual situation of the powder being too coarse or too fine. The operating pressure of the hydrogen crushing furnace is then corrected in reverse using the downstream powder particle size data.

[0022] Optional, the steps of the preset detection method include: Step 541: Analyze the signal curve in the pressure curve graph to obtain the pressure curve trend, and simultaneously acquire the furnace temperature value; Step 542: Analyze the temperature values ​​inside the furnace to obtain a temperature curve, and analyze the temperature curve trend from the temperature curve. Step 543: When the pressure curve trend is inconsistent with the preset downward trend, and the temperature curve trend is consistent with the preset reference temperature trend, the preset sealing cover is laid on the outer wall of the hydrogen crushing furnace. Step 544: When the pressure curve trend is inconsistent with the downward trend and the temperature curve trend is inconsistent with the reference temperature trend, stop heating and fill the furnace with inert gas until it is completely cooled down. Then, isolate and store the powder.

[0023] By adopting the above technical solutions and combining the changing trends of the pressure and temperature curves of the hydrogen crushing furnace, it is possible to determine whether the operating conditions of the hydrogen crushing furnace are normal. Corresponding measures are taken according to different abnormal types. When there is a gas leak, the outer wall is sealed for protection. When the temperature and pressure are abnormal, heating is stopped in time and inert gas is introduced for isolation and protection. Unqualified powder is stored separately to reduce potential equipment operation hazards and improve production safety.

[0024] Secondly, this application provides a dynamic balancing linkage system for continuous feeding of a hydrogen crushing gas mill, which adopts the following technical solution: A dynamic balancing linkage system for continuous feeding of a hydrogen-powered gas flow mill includes: The acquisition module is used to acquire parameter information such as pressure value, oxygen content, temperature value, and airflow rate; The memory is used to store the program of a dynamic balance linkage method for continuous feeding of a hydrogen crushing gas mill; The processor loads and executes programs stored in memory.

[0025] By adopting the above technical solution, a complete hydrogen crushing and conveying architecture is formed by the coordinated operation of the hydrogen crushing furnace, air jet mill, and transition silo. Each piece of equipment has a clear division of labor and close connection. A parameter acquisition module collects key production data such as pressure, temperature, and gas flow rate. The processor then runs the aforementioned linkage control method to achieve automated and coordinated operation of the entire system.

[0026] In summary, this application includes at least one of the following beneficial technical effects: The powder particle size is detected in real time. When the powder particles are too large, ultrasonic waves are activated to crush the large powder particles. By increasing the inert gas delivery flow rate, the airflow drives the powder to collide with each other, which helps to complete the crushing of large particles. The passivating agent ratio and dosage are adjusted in coordination with the feed rate and specific surface area to make the passivating agent ratio suitable for the real-time state of the powder and reduce powder oxidation problems. In critical conditions, purging protection is achieved by increasing the flow rate of inert gas, and in dangerous conditions, ultrasonic waves are activated in advance for preventive intervention, thereby reducing the probability of powder adhering to the walls of the transition silo and improving the operational stability of the equipment. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a dynamic balance linkage method for continuous feeding of a hydrogen-powered gas flow mill. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0029] This application discloses a dynamic balance linkage system for continuous feeding of a hydrogen-powered gas flow mill.

[0030] A dynamic balancing linkage system for continuous feeding of a hydrogen-powered gas flow mill includes: The acquisition module is used to acquire parameter information such as pressure value, oxygen content, temperature value, and airflow rate; The memory is used to store the program of a dynamic balance linkage method for continuous feeding of a hydrogen crushing gas mill; The processor loads and executes programs stored in memory.

[0031] Reference Figure 1 Based on the same inventive concept, embodiments of the present invention provide a dynamic balancing linkage method for continuous feeding of a hydrogen-powered gas mill, comprising: Step 1: In response to the dehydrogenation start signal, the preset furnace pressure value of the hydrogen crushing furnace is detected in real time.

[0032] The dehydrogenation signal refers to the process start-up trigger signal that is triggered when the dehydrogenation process of the hydrogen crusher is officially started.

[0033] The pre-set hydrogen crushing furnace refers to a dedicated hydrogen crushing furnace equipment that is fixedly configured on the production line and used for hydrogen absorption crushing and dehydrogenation reactions of NdFeB alloys.

[0034] The furnace pressure value refers to the gas pressure value detected in real time inside the sealed cavity of the hydrogen crushing furnace.

[0035] Upon receiving the dehydrogenation start signal from the hydrogen crusher, the system continuously collects real-time pressure data inside the furnace and monitors the changes in gas pressure throughout the process. During the dehydrogenation reaction, hydrogen is continuously consumed and discharged from the furnace, and the gas pressure changes regularly. By continuously monitoring the pressure inside the furnace, the system can keep track of the progress of the hydrogenation reaction in real time, providing basic parameters for judging the subsequent dehydrogenation reaction process.

[0036] Step 2: Analyze the changing pressure values ​​in real time to obtain a pressure curve, extract the slope of the signal curve from the pressure curve, and record the change time in real time.

[0037] A pressure curve is a real-time visualization chart of furnace pressure changes, with running time as the horizontal axis and the real-time pressure value of the hydrogen crusher as the vertical axis.

[0038] The signal curve refers to the real-time change curve that represents the continuous change in pressure inside the furnace.

[0039] The slope of the pressure curve refers to the gradient of the pressure change, used to characterize the rate of pressure decrease and change within the furnace. A smaller slope indicates a smoother pressure change and that the dehydrogenation reaction is closer to completion.

[0040] The system continuously collects furnace pressure and time data at each moment, connecting them to form a complete pressure change curve. On the signal curve corresponding to dehydrogenation, two adjacent or consecutive recording nodes are selected, and the time interval between the two nodes and the actual change in furnace pressure during this time are compared. By combining the magnitude of the pressure change and the corresponding consumption time, the slope of this curve is calculated, thereby obtaining the real-time slope of the signal curve.

[0041] The change time refers to the real-time duration during which the pressure curve undergoes a continuous and regular change.

[0042] It continuously collects real-time pressure data inside the hydrogen crushing furnace and automatically integrates it to generate a dynamic pressure curve. It calculates the slope of the signal curve in real time, accurately captures the rate of pressure drop, and simultaneously times and records the duration of stable pressure changes. It quantifies and provides feedback on the consumption rate of the dehydrogenation reaction inside the hydrogen crushing furnace, avoiding judgment errors caused by relying on manual observation of pressure changes.

[0043] Step 3: When the slope of the signal curve is less than the preset reference slope and continues for a preset duration, dehydrogenation is determined to be complete, and the powder is vacuum cooled.

[0044] The preset baseline slope refers to the pre-set standard pressure drop rate, which is the value used to determine the end of the dehydrogenation reaction.

[0045] The preset maintenance time refers to the fixed duration required for the pressure slope to remain stable below the benchmark value. This requires that the stable state of low-speed pressure change must be maintained to avoid misjudgment caused by instantaneous pressure fluctuations.

[0046] In the later stages of the dehydrogenation reaction, hydrogen consumption gradually slows down, and the rate of pressure drop inside the furnace decreases significantly. When the slope of the pressure curve is consistently lower than the pre-set baseline slope, and this gradual pressure drop continues for the preset duration, it can be objectively determined that the hydrogenation and dehydrogenation reaction inside the hydrogen crushing furnace has been completely completed. Subsequently, the highly reactive alloy powder inside the hydrogen crushing furnace is automatically vacuum-cooled to reduce the powder temperature and surface chemical activity, preventing oxidation of the high-temperature powder upon contact with residual gas.

[0047] Step 4: After vacuum cooling, start feeding powder into the preset air jet mill, and obtain the inert gas flow rate and powder feeding amount in real time in the preset transition hopper.

[0048] The pre-set airflow mill refers to a dedicated grinding equipment that is fixedly configured at the back end of the production line and used for the ultrafine grinding of coarse powder from hydrogenation.

[0049] The pre-set transition silo refers to a buffer silo set between the hydrogen crushing furnace and the air jet mill, used for intermediate storage and stable conveying of powder.

[0050] Inert gas refers to a protective gas, such as argon, which is chemically stable and does not react with the highly active NdFeB powder through oxidation or combination. It is used throughout the powder conveying process for protection and for stabilizing the pressure in sealed cavities.

[0051] The feed rate refers to the flow rate of hydrogen-coated powder material transported from the transition silo to the air jet mill per unit time.

[0052] After the hydrogen-crushed powder has undergone vacuum cooling and reached the required temperature and activity levels, the sealed feeding channel automatically opens, steadily and continuously conveying the coarse hydrogen-crushed powder to the air jet mill. Simultaneously, the inert gas flow rate and powder feed rate are collected in real time inside the transition silo and conveying pipeline, providing comprehensive control over the operating conditions of the transfer and conveying process and offering real-time parameters for dynamic adjustment of the passivating agent and control of the feeding balance.

[0053] Step 5: Detect the particle size of the powder in real time using a preset sampling method, and determine the specific surface area of ​​the powder based on the particle size.

[0054] Particle size refers to the actual particle size of hydrogen-rich powder particles, which is obtained by a laser particle size analyzer installed in the sampling channel.

[0055] Specific surface area refers to the total surface area of ​​a unit mass of powder. The finer the powder particle size and the greater the number of particles, the larger the specific surface area, the stronger the oxidation activity of the powder surface, and the higher the demand for passivation protection.

[0056] The actual sampling method involves performing online sampling according to a fixed sampling cycle preset by the system. A dedicated sampling channel is opened under control to quantitatively collect real-time flowing powder samples during the process of conveying the transition silo to the air jet mill. The extracted powder samples are then stably sent to the testing station, where a laser particle size analyzer built into the sampling channel is used to perform full particle size detection, continuously collecting powder particle size information and outputting accurate and effective powder particle size values ​​in real time. After each particle size test, the test data is automatically saved. Based on the pre-established correlation rules between particle size parameters and specific surface area, combined with the real-time measured powder particle size values, the actual specific surface area of ​​the current batch of powder is automatically calculated, realizing the synchronous real-time acquisition of powder particle size and surface activity parameters, providing accurate basic data for subsequent passivating agent ratio control.

[0057] The total amount of powder processed per unit time is determined by the powder feed rate, and the overall surface protection requirement of the powder is determined by the real-time detected powder specific surface area. Combined with the pre-tested and calibrated unit ratio of passivating agent, the baseline total amount of passivating agent required per unit time under the current working conditions can be matched and obtained. Based on this baseline amount of passivating agent and combined with the real-time flow rate of inert gas, the theoretical mixing ratio of passivating agent that needs to be achieved in an inert gas environment, i.e., the target ratio value, can be further calculated and derived.

[0058] For spherical particles, specific surface area The theoretical formula (unit: m² / g) is: ; in: True density of powder particles (for NdFeB alloys, the typical value is about 7.4~7.6 g / cm³, 7.5 g / cm³ can be taken). Particle size (unit: μm, which needs to be converted to cm or m for calculation).

[0059] Real-world powders are not perfectly spherical and exhibit particle size distribution; therefore, in engineering, the volume average diameter D[4,3] or surface area average diameter D[3,2] is commonly used. D[3,2] is directly related to the specific surface area, and laser particle size analyzers can usually output this value directly. If only D50 can be obtained, a shape factor can be introduced. (The powder from crushed brittle materials is typically taken as 0.7~0.9), corrected to: .

[0060] Simultaneously, the actual mixing ratio of passivating agent and inert gas in the mixed gas is continuously collected in real time, providing real-time feedback on the true proportion of passivating agent in the inert gas under operating conditions. By simultaneously acquiring the theoretically required standard proportion and the actual real-time proportion during on-site operation, it can adapt to the fluctuations in passivation demand caused by different powder particle sizes and different material conveying loads, providing accurate data reference for subsequent passivating agent replenishment and adjustment, and ensuring that the powder passivation protection ratio is accurately matched with the actual production conditions.

[0061] Inert gas volumetric flow rate (m³ / min or L / min); Powder feeding rate (g / min); Specific surface area of ​​powder (m² / g); Mass of passivating agent required per unit specific surface area (g / m²); The density (g / L) of the vapor passivating agent depends on the specific passivating agent (such as stearates, silanes) and its evaporation temperature.

[0062] The “proportion value” in step 6 usually refers to the volume percentage or mass percentage. In engineering, the mass percentage is more commonly used because the injection of passivating agent is usually controlled by a mass flow meter.

[0063] The total surface area of ​​the powder per unit time is: ; The theoretically required passivating agent mass flow rate is:

[0064] Calculate the mass percentage of the passivating agent in the inert gas = ;in The mass flow rate (g / min) of the inert gas is given. If the volumetric flow rate is known... and gas density (For example, nitrogen or argon), then: ; The true volume concentration of the passivating agent in the mixed gas is measured by an online gas analyzer (such as an infrared gas sensor or gas chromatograph) and converted into a mass percentage or volume percentage.

[0065] Step 6: Determine the proportion of passivating agent in inert gas per unit time based on the preset unit passivating agent dosage, powder feeding rate and powder specific surface area, and obtain the real-time proportion of passivating agent in inert gas.

[0066] The preset unit passivating agent dosage refers to the standard parameters that are calibrated in advance based on a large number of production tests and entered into the system, representing the basic passivating agent dosage required to match the powder per unit specific surface area.

[0067] The percentage value refers to the theoretical value calculated by combining the powder feed rate, specific surface area, and basic dosage, that is, the standard mixing ratio of the passivating agent that needs to be achieved in the inert gas. The physical meaning of the percentage value is the ratio of the required mass flow rate of the passivating agent to the mass flow rate (or volumetric flow rate) of the inert gas obtained simultaneously per unit time.

[0068] Real-time ratio refers to the actual real-time mixing ratio of the passivating agent and the inert gas.

[0069] By combining the preset standard dosage of passivating agent per unit ratio with the real-time collected powder feed rate and the converted powder specific surface area, the standard ratio of passivating agent required under the current operating conditions is calculated. Simultaneously, the mixing ratio of passivating agent and inert gas inside the pipeline is monitored in real time, and the theoretical standard is compared with the actual data to obtain the difference.

[0070] The required passivating agent mass flow rate is obtained by multiplying the aforementioned three parameters (i.e., passivating agent dosage per unit area × powder feed rate × powder specific surface area).

[0071] Step 7: Determine the amount of passivating agent to replenish based on the percentage value and the real-time percentage.

[0072] The amount of passivating agent to be added refers to the actual amount of passivating agent required to make up for the difference in the mixing ratio.

[0073] The calculated percentage value is compared and analyzed with the real-time percentage of passivating agent. When the actual percentage is low, the amount of passivating agent that needs to be added is calculated. When the actual percentage is high, the amount added is reduced. The amount of passivating agent added at each stage is accurately determined to ensure that the amount of passivating agent added changes dynamically with the state of the powder.

[0074] Step 8: Inject the preset amount of vaporized passivating agent to replenish the passivating agent.

[0075] The preset vapor passivating agent refers to a special protective agent that has been vaporized and mixed into the inert gas pipeline in gaseous form. It is uniformly coated on the surface of the powder particles to form a dense protective layer and inhibit the oxidation of NdFeB powder.

[0076] Based on the final determined amount of passivating agent replenishment, vaporized passivating agent is injected into the delivery pipeline to ensure that the passivating agent and inert gas are fully and evenly mixed. The passivating agent is then delivered synchronously with the protective gas to cover the powder surface in all directions, adapting to the antioxidant protection needs of powders with different particle sizes and different activity.

[0077] Reasons for choosing vapor-state passivating agents: 1. Vapor-state passivating agents are in a molecular-level gaseous form, which can completely mix with the inert gas in the pipeline and diffuse uniformly throughout the entire area. This allows for the indiscriminate coverage of hydrogen-rich powders of different particle sizes and high specific surface areas; it eliminates the problems of localized dripping and concentrated adhesion of liquid agents, ensuring uniform passivation protection on the surface of each powder particle and stronger mixing uniformity. 2. The molecular adhesion rate of gaseous passivating agents is slow, allowing for the gradual formation of a dense and uniform protective film on the surface of highly active rare earth powders. This avoids the violent localized reactions caused by contact with liquid agents, ensuring both antioxidant effect and preservation of the original particle properties of the powder.

[0078] Also includes: Step 11: Real-time monitoring of the pressure value of the transition silo.

[0079] The pressure value of the transition silo refers to the real-time gas pressure value inside the cavity of the transition silo.

[0080] Real-time monitoring of air pressure changes inside the transition hopper allows for indirect assessment of powder adhesion to the inner wall of the hopper based on pressure fluctuations.

[0081] Step 12: When the pressure value of the transition hopper is not less than the preset wall adhesion pressure, it is defined as powder adhering to the inner wall, and ultrasonic vibration is turned on.

[0082] The preset wall-hanging pressure refers to the pressure value set in advance, which serves as the criterion for determining whether powder adheres to the wall of the silo and causes blockage.

[0083] Ultrasonic vibration refers to the use of ultrasonic vibration modules to generate high-frequency vibrations, which are used to clean powder adhering to the inner wall of the hopper and to break up large pieces of powder.

[0084] When the real-time pressure of the transition silo reaches or exceeds the wall-hanging pressure value, it is determined that powder has adhered and accumulated on the inner wall of the silo, and the ultrasonic vibration device is automatically activated to start cleaning the inner wall.

[0085] Step 13: Control the ultrasonic waves to vibrate at preset intervals and vibration frequencies, and sample the powder within the intervals.

[0086] The preset interval time refers to the fixed interval period of the alternating start and stop of ultrasonic vibration.

[0087] The preset vibration frequency refers to the standard vibration frequency of the ultrasonic module during routine wall cleaning operations.

[0088] The ultrasonic waves are controlled intermittently according to the set start-stop interval and standard vibration frequency. During the interval when the vibration stops, powder samples are periodically extracted for particle size detection, and the powder status is monitored simultaneously.

[0089] Step 1301: When the particle size of the sampled powder is not greater than the preset minimum particle size value, stop the vibration until the particle size of the sampled powder is greater than the minimum particle size value, then resume the interval vibration.

[0090] The preset minimum powder particle size value refers to the lower limit of the powder particle size that the air jet mill allows the powder to pass through, and is used to determine whether the powder is excessively broken.

[0091] If the particle size of the sampled powder is less than or equal to the minimum particle size standard, stop the ultrasonic vibration immediately to prevent the powder from being broken down and refined again; restart the intermittent vibration operation after the powder particle size returns to the qualified range.

[0092] Step 1302: Determine the vibration correction frequency based on the preset single vibration time and the minimum particle size of the powder.

[0093] The preset single vibration time refers to the standard fixed duration of a single continuous ultrasonic vibration.

[0094] Vibration correction frequency refers to the ultrasonic adaptation vibration frequency adjusted based on the powder particle size distribution.

[0095] By combining the fixed duration of a single vibration cycle with the currently controlled minimum particle size limit for powder, a vibration correction frequency is calculated to match the current material condition. The vibration intensity is adaptively adjusted according to the fragility of the powder to prevent particle size exceeding the limit caused by fixed vibration parameters.

[0096] Step 1303: Correct the vibration frequency using the vibration correction frequency.

[0097] The calculated vibration correction frequency is used to replace the original fixed vibration frequency, thus completing the adaptive correction of the ultrasonic working parameters.

[0098] Step 14: Stop ultrasonic vibration when the pressure value of the transition silo is less than the wall-mounted pressure.

[0099] When the internal pressure of the transition silo drops below the preset wall-hanging pressure, it proves that the powder adhering to the silo wall has been detached by ultrasonic vibration and is transported normally with the inert airflow. The airflow inside the transition silo returns to smooth, and the ultrasonic vibration device is shut off in time.

[0100] Also includes: Step 1311: When the particle size of the sampled powder is not less than the preset maximum particle size, turn on the ultrasonic vibration.

[0101] The preset maximum powder particle size value refers to the upper limit of the powder particle size that the air jet mill allows the powder to pass through. It is used to determine the problem of excessive large particles and coarse powder caused by insufficient hydrogen crushing.

[0102] When the sampled powder particle size is greater than or equal to the preset maximum particle size value, it indicates that the upstream hydrogen crushing is incomplete and there are a large number of large powder particles. Large particles are easily worn by the air jet mill, causing uneven grinding. Therefore, ultrasonic vibration is actively activated to crush the excessive coarse powder.

[0103] Step 1312: Control the ultrasonic vibration to break up the powder at a preset vibration frequency within a preset vibration time, and record the number of vibrations.

[0104] The preset crushing time is a fixed duration for a single ultrasonic wave to continuously operate when crushing large powder particles.

[0105] The preset crushing frequency is a high-frequency vibration parameter set for the coarse powder crushing requirements.

[0106] The number of vibrations is the cumulative number of times the ultrasonic wave performs vibrations.

[0107] Within the set crushing time range, switch to a high-intensity crushing frequency to specifically crush and refine large powder particles, while accumulating and recording the number of crushing operations.

[0108] Step 1313: When the number of vibrations reaches the preset baseline number, the inert gas is increased by controlling the preset auxiliary flow rate to enhance the collision between powders and assist in breaking up large powders.

[0109] The preset reference number is a pre-set criterion used to identify whether ultrasonic-assisted vibration is used.

[0110] The preset auxiliary flow rate is the incremental flow rate of inert gas, which increases the particle collision force by increasing the airflow velocity.

[0111] When the cumulative number of ultrasonic crushing operations reaches the preset benchmark number, and the problem of large particles remains unresolved, the effect of simple vibration treatment is limited. At this point, the inert gas delivery flow rate is automatically increased, and the airflow speed in the pipeline is accelerated. The high-speed airflow drives the powder to collide and rub against each other, assisting in the crushing of hard, large particles and improving the overall crushing effect.

[0112] Step 1314: When the number of pulverizations reaches the preset alarm number, stop feeding powder and issue an alarm.

[0113] The preset alarm count is a pre-defined criterion used to identify powder abnormalities and trigger alarms.

[0114] When multiple measures such as ultrasonic crushing and airflow-assisted crushing are continuously executed and the cumulative number of times reaches the preset alarm number, it indicates that there is an abnormality in the hydrogen crushing process. The feeding operation should be stopped immediately, and an audible and visual alarm should be issued simultaneously to remind the staff to investigate in a timely manner.

[0115] Also includes: Step 31: Real-time monitoring of ambient temperature and humidity, and recording of the transition hopper pressure, feed rate, and powder particle size each time powder adheres to the inner wall.

[0116] The ambient temperature is the real-time ambient temperature inside the transition silo, which is sensed by a temperature sensor installed inside.

[0117] The ambient humidity is the real-time ambient humidity inside the transition silo, which is sensed by a humidity sensor installed inside.

[0118] The system collects real-time ambient temperature and humidity inside the transition silo, and records all operating parameters such as pressure, material conveying rate, and powder particle size of the transition silo during each powder adhesion failure.

[0119] Step 32: Store the ambient temperature, ambient humidity, transition silo pressure, material feeding rate, and powder particle size in a preset historical database.

[0120] The preset historical database is a built-in dedicated data storage module used to store environmental parameters, equipment pressure parameters, conveying parameters, and powder material detection parameters.

[0121] The historical database is pre-built and configured within the equipment control system, with independent data storage partitions corresponding to environmental parameters, silo pressure parameters, material conveying parameters, and powder detection parameters. The control system establishes communication connections with each detection and acquisition component, continuously collecting real-time operating data according to a fixed acquisition cycle. Ambient temperature, ambient humidity, transition silo pressure, powder conveying rate, and powder particle size are categorized, archived, and continuously written to the database, achieving long-term unified storage of multiple operating parameters for easy retrieval, analysis, and data processing.

[0122] All collected parameters, including ambient temperature and humidity, transition silo pressure, powder feeding rate, and powder particle size, are uniformly categorized and stored in the historical database.

[0123] Step 33: Analyze the historical database to determine the critical range and dangerous range of wall adhesion for each parameter.

[0124] The critical range of wall adhesion for each parameter is obtained through statistical analysis of historical data, which represents the numerical range of each parameter near the occurrence of wall adhesion.

[0125] The dangerous range of each parameter is derived from the statistical analysis of historical data. It is a range of values ​​that, under the combined effect of multiple parameters, are extremely prone to causing large-area powder adhesion, accumulation, and blockage.

[0126] By retrieving long-term accumulated operational data from historical databases, and comprehensively analyzing the correlation patterns between various environmental, equipment, and material parameters and wall-mounted failures, the critical and dangerous ranges corresponding to each parameter are determined.

[0127] Data on normal and stable feeding conditions, minor wall adhesion anomalies, and severe adhesion and blockage faults, stored in the historical database, were retrieved. All parameters, including ambient temperature, ambient humidity, transition silo pressure, powder feed rate, and powder particle size, were correlated with the occurrence and severity of wall adhesion. For each parameter individually, the numerical variation boundary between normal operation and the initial occurrence of minor wall adhesion was analyzed to define the critical wall adhesion range for that parameter. Furthermore, considering the superimposed conditions of multiple parameters exhibiting synchronous anomalies, the combined numerical ranges of multiple parameters deviating from the standard range and consistently triggering large-area powder adhesion and material accumulation were collectively defined as the dangerous wall adhesion range.

[0128] Step 34: When the pressure value of the transition silo, the conveying rate, the particle size of the powder, the ambient temperature and the ambient humidity are all within the critical range of wall adhesion, increase the flow rate of inert gas to purge.

[0129] When multiple key parameters, such as transition silo pressure, powder feed rate, powder particle size, and ambient temperature and humidity, simultaneously fall within the critical range for powder adhesion to the silo wall, it indicates that a slightly risky state has been entered. The system automatically increases the inert gas delivery flow rate, using high-speed airflow to gently purge the inner wall of the silo, inhibiting slight powder adhesion and proactively preventing wall adhesion problems.

[0130] Step 35: When the pressure value of the transition silo, the conveying rate, the particle size of the powder, the ambient temperature and the ambient humidity are all within the dangerous range of wall adhesion, turn on the ultrasonic vibration to prevent it.

[0131] When multiple parameters simultaneously fall into the dangerous range of wall adhesion, it means that the current environmental conditions have reached the conditions for powder wall adhesion to occur. The system predicts the abnormal risk in advance and actively starts the ultrasonic vibration device. By continuously vibrating and disturbing the state of the material in the silo, it destroys the conditions for powder to adhere to the wall, inhibits powder adhesion and accumulation from the source, realizes the preventive intervention of wall adhesion problem, and ensures the stable operation of continuous hydrogen crushed powder conveying.

[0132] Also includes: Step 41: After the particle size value detection is completed, record the pressure build-up time when the negative pressure in the sampling channel reaches the preset pressure stability value after each sampling is started.

[0133] The preset pressure stability value is the standard pressure value after negative pressure acquisition has stabilized under normal and unobstructed conditions of the sampling channel.

[0134] The pressure build-up time is the time it takes for the internal pressure of the sampling channel to stabilize from the starting state to the standard stable pressure value after the negative pressure sampling is started. Pipeline blockage will directly prolong the pressure build-up time.

[0135] After each powder particle size sampling test is completed, the system automatically records the complete time it takes for the negative pressure in the sampling channel to build up and stabilize. Powder residue on the inner wall of the sampling channel will reduce the cross-sectional area of ​​the pipeline flow, causing the negative pressure to build up more slowly. By recording the pressure build-up time, the degree of pipeline unobstructed flow can be accurately reflected.

[0136] Step 42: Generate a pressure build-up trend chart based on the recorded pressure build-up time for each time.

[0137] The pressure build-up trend chart is a curve plotted with the number of samplings on the horizontal axis and the pressure build-up time corresponding to the number of samplings on the vertical axis. It is used to represent the smooth operation of the sampling channel.

[0138] By integrating pressure build-up time data obtained from multiple consecutive tests, a visual pressure build-up trend chart is automatically generated.

[0139] Step 43: Analyze the pressure build-up trend chart to obtain the duration trend of pressure build-up time.

[0140] The duration trend is obtained by analyzing the pressure buildup trend graph, showing the curve trend representing the change in single pressure buildup time for each sampling. This is compared with the slope of the curve obtained in the previous steps.

[0141] Analyze the data changes in the pressure build-up trend chart to determine whether the overall pressure build-up time is gradually increasing, decreasing, or remaining stable, in order to identify the changing trend of powder adhering to the wall and causing blockage.

[0142] Step 44: When the long-term trend is consistent with the preset increasing trend, it is determined that there is a wall hanging in the sampling channel, and sampling is suspended.

[0143] The preset increasing trend is a pre-defined standard abnormal pattern, specifically referring to the characteristic of a gradual extension of the pressure build-up time in multiple consecutive batches, indicating that the pipeline is gradually blocked.

[0144] When the overall variation pattern of pressure build-up time is consistent with the preset increasing trend, it proves that powder has slowly adhered to the inner wall of the sampling channel. Sampling should be suspended and pipeline cleaning should begin.

[0145] Step 45: Backflush the sampling channel by injecting pulsed inert gas in the reverse direction to backflush the residual powder sample in the sampling channel into the air jet mill.

[0146] Pulse-type inert gas is high-pressure inert gas that is output in an intermittent, intermittent injection manner.

[0147] Pulsed inert gas is introduced into the blocked sampling channel in reverse, and the reverse high-pressure airflow is used to flush the inner wall of the pipeline, blowing off all the attached and residual powder, and then returning it to the back-end air mill. This cleans the pipeline without wasting materials.

[0148] Step 46: After the preset backflush time, resume sampling.

[0149] The preset backflush time is a fixed duration of reverse purging that is set in advance.

[0150] After the pulse backflushing operation continues for the preset backflushing time, the backflushing air source is automatically shut off. Once the sampling channel is unobstructed, powder sampling and particle size detection are restarted.

[0151] The steps when the pressure value of the transition silo is not less than the preset wall-hanging pressure also include: Step 121: Obtain the pressure values ​​of the sections corresponding to the preset sections in the transition silo.

[0152] Multiple preset silo locations refer to the detection areas corresponding to several pressure detectors set along the height and length directions of the transition silo, and the corresponding wall-mounted locations.

[0153] The section pressure value is the internal pressure value measured individually for each independent compartment area.

[0154] The transition silo is divided into multiple independent sections, with pressure monitoring points set up at each section to collect pressure values ​​for each area. Unlike overall silo pressure monitoring, segmented pressure monitoring can accurately identify localized airflow anomalies and powder accumulation issues.

[0155] Step 122: When the section pressure value is greater than the preset benchmark pressure value, the section position where the section pressure value is greater than the benchmark pressure value is defined as the wall hanging position.

[0156] The preset baseline pressure value is the standard pressure value for normal and stable operation of a single compartment, and serves as the criterion for determining whether the pressure of a compartment is abnormal.

[0157] The wall-hanging location refers to the specific storage area where powder adhesion and accumulation have already occurred or are about to occur.

[0158] The real-time pressure value of each compartment is compared with the preset benchmark pressure value. When the pressure of a certain compartment is significantly higher than the standard value, it indicates that the airflow in that area is severely blocked, and that area is directly identified as the location of powder adhering to the wall.

[0159] Step 123: Determine the blowing angle based on the wall position and obtain the number of wall-mounted items at the wall position.

[0160] The blowing angle is a uniquely matched angle for the directional injection of inert gas, tailored to the structural position of different wall-mounted compartment sections, ensuring that the airflow is precisely directed towards the adhesion areas on the compartment walls.

[0161] The number of wall-mounted items is the total number of faulty compartment locations detected and identified within the same time period.

[0162] Based on the identified specific locations of wall adhesion, the corresponding directional air blowing angle is matched in advance in conjunction with the internal structure of the silo; at the same time, all abnormal silo sections are statistically summarized to determine the number of wall adhesion points.

[0163] Step 124: When the amount of material adhering to the wall is no more than 1, inert gas is introduced at a blowing angle, so that the inert gas is blown towards the powder along the inner wall of the transition hopper.

[0164] Inert gas is precisely injected at the matching blowing angle, causing the airflow to flow closely along the inner wall of the transition hopper, directly washing away the adhering powder.

[0165] The airflow travels along the inner wall, which limits the area of ​​action and targets only the powder that is agglomerated or attached to the wall, avoiding the direct impact of high-pressure airflow on the loose powder being transported normally in the middle of the hopper; it can efficiently peel off locally attached powder and also avoid powder collision caused by direct airflow.

[0166] Step 125: When the amount of powder adhering to the wall is greater than 1, determine the blowing sequence along the powder flow direction, and fill inert gas in a preset reverse order and blowing angle.

[0167] The blowing sequence is the order in which multiple wall-mounting points are determined sequentially along the powder flow direction.

[0168] The preset reverse order is the opposite of the blowing order, that is, the order in the opposite direction of powder flow.

[0169] When there are multiple points where powder adheres to the wall, priority should be given to cleaning the powder adhering to the downstream wall to prevent the powder that has fallen off from the upstream from being carried downstream by the airflow and directly impacting and squeezing the powder that has not been cleaned down the downstream wall; at the same time, it is necessary to prevent the powder that has fallen off from multiple places from mixing, colliding, or agglomerating again.

[0170] Also includes: Step 51: Obtain the particle size values ​​of the powder from the upper sample in the upper sampling channel of the transition silo and the powder size values ​​of the powder from the lower sample in the lower sampling channel of the transition silo.

[0171] The upper sampling channel is an independent sampling pipeline installed and fixed in the upper area of ​​the transition silo, used to collect upper powder samples.

[0172] The particle size value of the powder sample at the top is a particle size parameter obtained from sampling and testing at the top of the silo, representing the coarseness of the material in the upper layer.

[0173] The lower sampling channel is an independent sampling pipeline installed and fixed in the lower discharge area of ​​the transition silo, used to collect powder samples from the lower layer.

[0174] The particle size value of the powder sample at the bottom is a particle size parameter obtained by sampling and testing at the bottom of the silo, representing the coarseness of the material at the discharge end.

[0175] Inside the transition silo, the powder is affected by gravity, inertial airflow disturbance, and differences in particle weight. Different particle sizes naturally settle differently: heavy powders with large mass and size tend to settle and accumulate at the bottom of the silo, while light, fine powders tend to remain suspended at the top, easily leading to material stratification. Sampling from a single location cannot fully reflect the overall uniformity of the powder within the silo. Independent sampling at both the top and bottom of the silo allows for comprehensive capture of the differences in powder coarseness and fineness distribution across different areas, eliminating the bias of the sampling method.

[0176] Step 52: Calculate the difference between the particle size values ​​of the upper sample powder and the lower sample powder and define it as the stratification difference.

[0177] The stratification difference is the calculated difference between the particle size detection values ​​of the upper and lower powders. The larger the value, the more severe the stratification and separation of powder particles.

[0178] Calculate the particle size difference between the upper and lower powder layers to determine whether the powder undergoing hydrogen crushing in the hydrogen crushing furnace is severely separated.

[0179] Step 53: When the stratification difference is not less than the preset benchmark difference, it is determined that the powder stratification is serious, and the hydrogen crushing furnace is tested using the preset detection method.

[0180] The preset baseline difference is a pre-set critical value for the stratification difference, which is the standard for determining powder stratification.

[0181] If the calculated stratification difference is greater than or equal to the preset benchmark difference, it indicates that the powder stratification inside the silo is severe, which may be due to a problem with the hydrogen crushing furnace or the powder in the furnace, and it needs to be tested.

[0182] Also includes: Step 61: Record the particle size of the powder in real time and obtain the average particle size of the powder.

[0183] The average particle size is the average particle size obtained by collecting multiple sets of continuous real-time particle size detection data and calculating it. It is used to reflect the overall fineness level of hydrogen-coated powder.

[0184] Continuously record the powder particle size data for each sampling test, and periodically calculate the average particle size to avoid random errors from single test data.

[0185] Step 62: Determine the pressure increase or decrease based on the comparison between the average particle size and the preset benchmark particle size range.

[0186] The preset reference particle size range is a pre-defined range of qualified particle sizes for hydrogen-crushed powder, used to determine whether the pressure inside the furnace needs to be increased or decreased.

[0187] The increased pressure indicates that the overall powder particle size is too large, the hydrogen crushing is insufficient, and the internal pressure value of the hydrogen crushing furnace needs to be increased.

[0188] The pressure reduction indicates that the overall powder particle size is too small, the hydrogen crushing is excessive, and the internal pressure value of the hydrogen crushing furnace needs to be reduced.

[0189] The average particle size of the powder obtained in real time is compared with the preset benchmark particle size range. If the average particle size exceeds the maximum value of the qualified range, the powder is generally too coarse, and the corresponding furnace pressure is increased to enhance the hydrogen crushing effect. If the average particle size is lower than the minimum value of the qualified range, the powder is generally too fine, and the pressure is decreased to reduce the crushing intensity.

[0190] Step 63: Correct the furnace pressure value based on the amount of pressure increase or decrease.

[0191] The set operating pressure of the hydrogen crusher is automatically adjusted according to the calculated pressure increase or decrease.

[0192] The steps of the preset detection method include: Step 541: Analyze the signal curve in the pressure curve graph to obtain the pressure curve trend, and simultaneously acquire the furnace temperature value.

[0193] The pressure curve trend represents the changing trend of the pressure value inside the hydrogen crusher.

[0194] The furnace temperature value is the real-time temperature inside the hydrogen crushing furnace.

[0195] The overall trend of the pressure signal curve during the dehydrogenation stage was analyzed, and the real-time operating temperature inside the hydrogen crushing furnace was simultaneously obtained from the temperature detector.

[0196] Step 542: Analyze the temperature values ​​inside the furnace to obtain a temperature curve, and analyze the temperature curve trend from the temperature curve.

[0197] The temperature curve is a continuous curve generated with time on the horizontal axis and real-time temperature inside the furnace on the vertical axis.

[0198] The temperature curve trend is the changing trend of the temperature value inside the hydrogen crushing furnace.

[0199] Step 543: When the pressure curve trend is inconsistent with the preset downward trend, and the temperature curve trend is consistent with the preset reference temperature trend, the preset sealing cover is laid on the outer wall of the furnace.

[0200] The preset downward trend is the trend of pressure decrease in the furnace under normal dehydrogenation conditions.

[0201] The preset reference temperature trend is the normal temperature fluctuation trend when the hydrogen crusher is working normally.

[0202] The pre-set sealing cover is a sealing sleeve with airtight protection and heat insulation functions, used to wrap the outer wall of the furnace body and temporarily repair the furnace body with slight air leakage.

[0203] If the furnace pressure fails to decrease as expected, but the furnace temperature remains stable at the baseline temperature, it indicates that the heating system is functioning normally and there is only a minor sealing leak in the furnace body. In this case, a pre-set sealing cover should be installed on the outer wall of the furnace body to enhance its airtightness, reduce gas leakage, and ensure stable dehydrogenation operation.

[0204] Step 544: When the pressure curve trend is inconsistent with the downward trend and the temperature curve trend is inconsistent with the reference temperature trend, stop heating and fill the furnace with inert gas until it is completely cooled down. Then, isolate and store the powder.

[0205] When the pressure curve changes abnormally and the temperature curve deviates from the standard reference trend at the same time, it indicates that the powder may contain impurities or other reasons. Immediately stop the heating operation and continuously introduce inert gas into the furnace for isolation and protection until the furnace body is completely cooled down. At the same time, isolate and store the abnormal powder in the furnace separately to avoid powder mixing.

[0206] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A dynamic balancing linkage method for continuous feeding of a hydrogen-powered gas jet mill, characterized in that, include: Step 1: In response to the dehydrogenation start signal, the preset furnace pressure value of the hydrogen crushing furnace is detected in real time; Step 2: Analyze the changing pressure values ​​in real time to obtain a pressure curve, extract the slope of the signal curve from the pressure curve, and record the change time in real time. Step 3: When the slope of the signal curve is less than the preset reference slope and continues for a preset duration, dehydrogenation is determined to be complete, and the powder is vacuum cooled. Step 4: After vacuum cooling, start feeding powder into the preset air jet mill, and obtain the inert gas flow rate and powder feeding amount in real time in the preset transition hopper. Step 5: Detect the particle size of the powder in real time using a preset sampling method, and determine the specific surface area of ​​the powder based on the particle size. Step 6: Determine the proportion of passivating agent in inert gas per unit time based on the preset unit ratio of passivating agent dosage, powder feeding rate and powder specific surface area, and obtain the real-time proportion of passivating agent in inert gas. Step 7: Determine the amount of passivating agent to replenish based on the percentage value and the real-time percentage; Step 8: Inject the preset amount of vaporized passivating agent to replenish the passivating agent; Also includes: Step 11: Real-time monitoring of the pressure value in the transition silo; Step 12: When the pressure value of the transition hopper is not less than the preset wall adhesion pressure, it is defined as powder adhering to the inner wall, and ultrasonic vibration is turned on; Step 13: Control the ultrasonic waves to vibrate at preset intervals and vibration frequencies, and sample the powder within the intervals. Step 1301: When the particle size of the sampled powder is not greater than the preset minimum particle size value, stop the vibration until the particle size of the sampled powder is greater than the minimum particle size value, then resume the interval vibration. Step 1302: Determine the vibration correction frequency based on the preset single vibration time and the minimum particle size of the powder; Step 1303: Correct the vibration frequency using the vibration correction frequency; Step 14: Stop ultrasonic vibration when the pressure value of the transition silo is less than the wall-mounted pressure; Also includes: Step 1311: When the particle size of the sampled powder is not less than the preset maximum particle size, turn on the ultrasonic vibration; Step 1312: Control the ultrasonic vibration to break up the powder within the preset vibration time and at the preset vibration frequency, and record the number of vibrations. Step 1313: When the number of crushing times reaches the preset baseline number, the inert gas is increased by controlling the preset auxiliary flow rate to enhance the collision between powders and assist in crushing large powders; Step 1314: When the number of pulverizations reaches the preset alarm number, stop feeding powder and issue an alarm.

2. The dynamic balance linkage method for continuous feeding of a hydrogen-powered gas jet mill according to claim 1, characterized in that, Also includes: Step 31: Real-time monitoring of ambient temperature and humidity, and recording of the transition hopper pressure, feed rate, and powder particle size each time powder adheres to the inner wall; Step 32: Store the ambient temperature, ambient humidity, transition silo pressure, material conveying rate, and powder particle size in a preset historical database; Step 33: Analyze the historical database to determine the critical range and dangerous range of wall adhesion for each parameter; Step 34: When the pressure value of the transition silo, the conveying rate, the particle size of the powder, the ambient temperature and the ambient humidity are all within the critical range of wall adhesion, increase the flow rate of inert gas to purge; Step 35: When the pressure value of the transition silo, the conveying rate, the particle size of the powder, the ambient temperature and the ambient humidity are all within the dangerous range of wall adhesion, turn on the ultrasonic vibration to prevent it.

3. The dynamic balancing linkage method for continuous feeding of a hydrogen-powered gas jet mill according to claim 1, characterized in that, Also includes: Step 41: After the particle size value detection is completed, record the pressure build-up time when the negative pressure in the sampling channel reaches the preset pressure stability value after each sampling is started; Step 42: Generate a pressure build-up trend chart based on the recorded pressure build-up time for each time; Step 43: Analyze the pressure build-up trend chart to obtain the duration trend of pressure build-up time; Step 44: When the long-term trend is consistent with the preset increasing trend, it is determined that there is wall adhesion in the sampling pipeline, and sampling is suspended. Step 45: Backflush the sampling channel by introducing pulsed inert gas in reverse to backflush the residual powder sample in the sampling channel into the air jet mill. Step 46: After the preset backflush time, resume sampling.

4. The dynamic balance linkage method for continuous feeding of a hydrogen-powered gas jet mill according to claim 1, characterized in that, The steps when the pressure value of the transition silo is not less than the preset wall-hanging pressure also include: Step 121: Obtain the segment pressure values ​​corresponding to multiple preset segment positions within the transition silo; Step 122: When the section pressure value is greater than the preset reference pressure value, the section position where the section pressure value is greater than the reference pressure value is defined as the wall hanging position; Step 123: Determine the blowing angle based on the wall position and obtain the number of wall-mounted items at the wall position; Step 124: When the amount of material adhering to the wall is no more than 1, inert gas is introduced at the blowing angle so that the inert gas is blown towards the powder along the inner wall of the transition hopper. Step 125: When the amount of powder adhering to the wall is greater than 1, determine the blowing sequence along the powder flow direction, and fill inert gas in a preset reverse order and blowing angle.

5. The dynamic balancing linkage method for continuous feeding of a hydrogen-powered gas jet mill according to claim 1, characterized in that, Also includes: Step 51: Obtain the particle size values ​​of the powder from the upper sample in the upper sampling channel of the transition silo and the powder particle size values ​​from the lower sample in the lower sampling channel of the transition silo. Step 52: Calculate the difference between the particle size values ​​of the upper sample powder and the lower sample powder and define it as the stratification difference; Step 53: When the stratification difference is not less than the preset benchmark difference, it is determined that the powder stratification is serious, and the hydrogen crushing furnace is tested using the preset detection method.

6. The dynamic balancing linkage method for continuous feeding of a hydrogen-powered gas jet mill according to claim 5, characterized in that, Also includes: Step 61: Record the particle size of the powder in real time and obtain the average particle size of the powder; Step 62: Determine the pressure increase or decrease based on the comparison between the average particle size and the preset benchmark particle size range; Step 63: Correct the furnace pressure value based on the amount of pressure increase or decrease.

7. The dynamic balancing linkage method for continuous feeding of a hydrogen-powered gas jet mill according to claim 5, characterized in that, The steps of the preset detection method include: Step 541: Analyze the signal curve in the pressure curve graph to obtain the pressure curve trend, and simultaneously acquire the furnace temperature value; Step 542: Analyze the temperature values ​​inside the furnace to obtain a temperature curve, and analyze the temperature curve trend from the temperature curve. Step 543: When the pressure curve trend is inconsistent with the preset downward trend, and the temperature curve trend is consistent with the preset reference temperature trend, the preset sealing cover is laid on the outer wall of the furnace. Step 544: When the pressure curve trend is inconsistent with the downward trend and the temperature curve trend is inconsistent with the reference temperature trend, stop heating and fill the furnace with inert gas until it is completely cooled down. Then, isolate and store the powder.

8. A dynamic balancing linkage system for continuous feeding of a hydrogen-powered gas jet mill, characterized in that, include: The acquisition module is used to acquire parameter information such as pressure value, oxygen content, temperature value, and airflow rate; A memory for storing a program of a dynamic balance linkage method for continuous feeding of a hydrogen crushing gas mill as described in any one of claims 1 to 7; The processor loads and executes programs stored in memory.

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