Continuous crushing and screening method for traditional Chinese medicine solid particles

Abstract

The invention relates to the technical field of process control, and discloses a continuous crushing and screening method for traditional Chinese medicine solid particles. Dividing an adjusting period according to the average passing time of the tracer particles, and collecting a new material cumulant, an oversize coarse particle backflow cumulant and a buffer bin inventory in the period; collecting current, voltage difference and amplitude in a no-load manner, establishing a reference, and setting a rotating speed, a gap and a backflow boundary; calculating a target total load, a theoretical returnable amount and a trough depth according to the preorder and the current new material flow and the inventory, obtaining a screen surface load index and a backflow stopping threshold by combining a state relative reference, solving an actual backflow amount, and updating the inventory; adjusting the rotating speed and the gap according to the total load deviation, continuously crushing and screening, and updating the state. Therefore, sampling and material response are synchronized, threshold drift is inhibited, overload, screen blocking and backflow impact are avoided, incoming material fluctuation is adapted, invalid circulation is reduced, and continuous operation stability and repeatability are improved.

Description

Technical Field

[0001] This invention relates to the field of process control technology, specifically to a continuous pulverization and sieving method for solid particles of traditional Chinese medicine. Background Technology

[0002] In the preparation of formulation granules, pellets, and intermediates, solid granules of traditional Chinese medicine typically require continuous or quasi-continuous crushing and sieving to ensure that the particle size meets the requirements for subsequent mixing, filling, dissolution, or molding. In existing technologies, a common practice is to arrange crushing and sieving equipment in series, with coarse particles on the sieve being returned to the crushing section via a reflux channel, thus forming a continuous crushing and sieving process. This type of technology generally enables continuous material turnover and features large throughput and minimal human intervention, and has been widely applied in the production of solid dosage forms of traditional Chinese medicine.

[0003] However, existing technologies often organize the crushing and screening processes using a fixed reflux method or a coarse linkage method in actual operation. This means that coarse particles generated on the screen are directly refluxed, or the feed rate, crushing intensity, and screening state are simply adjusted based on a single parameter, lacking detailed coordination of the relationship between new material fluctuations, reflux cycle time, screen surface load, and buffer inventory. Especially when there are periodic fluctuations in upstream granulation or pre-crushing discharge, if the coarse particle reflux coincides with the peak of new material flow, it can easily cause a sudden increase in the instantaneous load of the crushing section, leading to increased local pressure differential in the screening section, changes in screen surface vibration, and an increase in the amount of coarse particles circulating, which is detrimental to the stability of continuous operation. Furthermore, existing technologies often lack transition buffering and cycle time allocation mechanisms for handling refluxed particles, the relationship between the coarse particle reflux volume and the buffer inventory is unclear, and the capacity of the screening section is not fully utilized. In the final emptying stage, if the conventional average reflux or fixed reflux logic is still used, there may be problems such as insufficient release of residual coarse particles in the buffer bin and low emptying efficiency. On the other hand, existing technologies often set execution parameters such as crushing speed and crushing gap independently of the total load changes, making it difficult to coordinate and adjust according to the total load formed by the new material and the return flow. As a result, problems such as large load fluctuations, uneven process connection and insufficient operation stability can easily occur in continuous crushing and screening processes.

[0004] Therefore, this case aims to propose a continuous crushing and sieving method for solid particles of traditional Chinese medicine. Without interrupting continuous production, the method regards the new material entering the crushing zone, the return of coarse particles on the screen, and the storage in the buffer warehouse as three key nodes in the same material flow network. An idle load reference is introduced to normalize and compare the sensor signals. Multi-source state parameters are used to form a screen surface load characterization and a stop-return threshold to achieve adaptive control of "letting or stopping, and how much to let out". At the same time, the crushing speed and crushing gap are adjusted in linkage according to the deviation between the total load and the target total load, so that the crushing and sieving stages operate stably and collaboratively under the same cycle. Summary of the Invention

[0005] This invention provides a continuous pulverization and sieving method for solid particles of traditional Chinese medicine, which helps to solve the problems mentioned in the background art.

[0006] This invention provides the following technical solution: a continuous pulverization and sieving method for solid particles of traditional Chinese medicine, comprising: Adjacent adjustment cycles are divided by the average travel time of tracer particles from entering the crushing inlet to the stable outflow of qualified particles under the screen. The cumulative mass of new material entering the crushing zone, the cumulative mass of coarse particles on the screen entering the return branch, and the mass of buffer warehouse at the beginning of the current adjustment cycle are collected. Collect samples of motor current, differential pressure at predetermined measuring points, and screen surface amplitude during no-load operation to establish no-load reference parameters, and set boundary parameters for crushing speed, crushing gap, and average reflux mass flow rate. Based on the average mass flow rate of new material entering the crushing zone during the current adjustment cycle and the mass of material stored in the buffer warehouse during the previous adjustment cycle, the target total load flow rate, the theoretical average recirculation mass flow rate, and the trough depth are obtained. Based on the relationship between the state parameters and the no-load reference parameters, obtain the screen surface load index and the stop-flow threshold. The actual average quality flow rate of the backflow is obtained based on the backflow stop threshold, the buffer warehouse inventory quality, and the maximum average quality flow rate of the backflow. Update the buffer warehouse inventory at the start of the next adjustment cycle based on the cumulative mass of coarse particles entering the reflux branch and the actual average reflux mass flow rate. The total load flow rate is obtained based on the average mass flow rate of the new material entering the crushing zone and the actual average mass flow rate of the return flow. The crushing speed and crushing gap are obtained based on the deviation between the total load flow rate and the target total load flow rate. Continuous crushing and screening are performed based on the average mass flow rate of the new material entering the crushing zone, the actual average mass flow rate of the return flow, the crushing speed, and the crushing gap. Qualified particles under the screen are discharged, and coarse particles on the screen are introduced into the buffer chamber through the return branch, and the status parameters for the next adjustment cycle are updated.

[0007] Optionally, the adjacent adjustment cycles are divided based on the average passage time of the tracer particles from the crushing inlet to the stable outflow of qualified particles from the sieve, and the cumulative mass of new material entering the crushing zone, the cumulative mass of coarse particles entering the return branch, and the mass of the buffer warehouse at the beginning of the current adjustment cycle are collected within the current adjustment cycle. Specifically, this includes: The average passage time of the tracer particles from the pulverizing inlet to the stable outflow of qualified particles under the sieve is used as the duration of the adjustment cycle. The continuous production process is divided into multiple adjustment cycles that are connected end to end, and each adjustment cycle is numbered according to the order of occurrence. Before the start of each adjustment cycle, the feeding metering unit measures the cumulative mass of new material entering the crushing zone during the current adjustment cycle; At the end of each adjustment cycle, the cumulative mass of coarse particles on the screen entering the reflux branch during the current adjustment cycle is measured. The average mass flow rate of new material entering the crushing zone during the current adjustment cycle is calculated by dividing the cumulative mass of new material entering the crushing zone during the current adjustment cycle by the duration of the adjustment cycle. Divide the cumulative mass of coarse particles on the screen entering the return branch during the current adjustment cycle by the duration of the adjustment cycle to form the average mass flow rate of coarse particles on the screen entering the return branch during the current adjustment cycle. The coarse particles on the sieve are introduced into the buffer bin via the reflux branch, and the mass of the buffer bin at the start of the current adjustment cycle is recorded.

[0008] Optionally, the step of collecting samples of motor current, differential pressure at predetermined measuring points, and sieve surface amplitude during no-load operation to establish no-load reference parameters, and setting boundary parameters for crushing speed, crushing gap, and average reflux mass flow rate, specifically includes: Before the formal feeding, the crusher and screener are run unloaded for one adjustment cycle under normal operating conditions, and discrete samples of motor current, pressure difference between predetermined measuring points upstream and downstream of the screening section, and screen surface amplitude are collected during the unloaded adjustment cycle. The arithmetic mean of all motor current samples collected during the no-load regulation cycle is taken to form the no-load reference current. The arithmetic mean of all differential pressure samples collected during the no-load regulation cycle is used to form the no-load reference differential pressure. The arithmetic mean of all screen surface amplitude samples collected during the no-load adjustment cycle is used to form the no-load reference amplitude. Obtain the minimum and maximum grinding speeds, minimum and maximum grinding gaps, and maximum average reflux mass flow rates allowed by the equipment. Set the buffer warehouse inventory quality to zero before the start of the first adjustment cycle at the first startup. Set the state current of the first adjustment cycle to the no-load reference current, set the state voltage difference of the first adjustment cycle to the no-load reference voltage difference, and set the state amplitude of the first adjustment cycle to the no-load reference amplitude. From the second adjustment cycle onwards: The arithmetic mean of all motor current samples collected in the previous completed adjustment cycle immediately preceding the current adjustment cycle is taken to form the state current of the current adjustment cycle. The arithmetic mean of all differential pressure samples collected in the previous completed regulation cycle immediately preceding the current regulation cycle is used to form the state differential pressure of the current regulation cycle. The arithmetic mean of all sieve surface amplitude samples collected in the previous completed adjustment cycle immediately preceding the current adjustment cycle is taken to form the state amplitude of the current adjustment cycle.

[0009] Optionally, the step of obtaining the target total load flow rate, theoretically reversible average mass flow rate, and trough depth based on the average mass flow rate of new material entering the crushing zone during the current adjustment cycle and the mass of material stored in the buffer warehouse during the previous adjustment cycle specifically includes: During the first adjustment cycle, the average mass flow rate of the new material entering the crushing zone during the first adjustment cycle is taken as the target total load flow rate for the first adjustment cycle. During the second adjustment cycle, the arithmetic mean of the average mass flow rate of the new material entering the crushing zone during the first adjustment cycle and the average mass flow rate of the new material entering the crushing zone during the second adjustment cycle is taken as the target total load flow rate for the second adjustment cycle. Starting from the third adjustment cycle, when the sum of the average mass flow rate of new material entering the crushing zone in the current adjustment cycle, the average mass flow rate of new material entering the crushing zone in the previous adjustment cycle, and the average mass flow rate of new material entering the crushing zone in the previous two adjustment cycles is greater than zero, the arithmetic mean of the average mass flow rate of new material entering the crushing zone in the current adjustment cycle, the average mass flow rate of new material entering the crushing zone in the previous adjustment cycle, and the average mass flow rate of new material entering the crushing zone in the previous two adjustment cycles is taken as the target total load flow rate for the current adjustment cycle. Starting from the third adjustment cycle, when the sum of the average mass flow rate of new material entering the crushing zone in the current adjustment cycle, the average mass flow rate of new material entering the crushing zone in the previous adjustment cycle, and the average mass flow rate of new material entering the crushing zone in the previous two adjustment cycles equals zero, the buffer warehouse inventory mass at the beginning of the current adjustment cycle is divided by the duration of the adjustment cycle to form the inventory-converted average flow rate of the current adjustment cycle. The inventory-converted average flow rate of the current adjustment cycle is then compared with the maximum return average mass flow rate, and the smaller value is taken as the target total load flow rate of the current adjustment cycle. For the current adjustment cycle, the target total load flow rate is compared with the average mass flow rate of new material entering the crushing zone during the current adjustment cycle. When the target total load flow rate is greater than the average mass flow rate of new material entering the crushing zone during the current adjustment cycle, the difference between the two is used as the theoretical average mass flow rate that can be returned. When the target total load flow rate is less than or equal to the average mass flow rate of new material entering the crushing zone during the current adjustment cycle, the theoretical average mass flow rate that can be returned is set to zero. When the target total load flow is greater than zero, the theoretical reversible average mass flow is divided by the target total load flow to form the trough depth of the current adjustment cycle; when the target total load flow is equal to zero, the trough depth of the current adjustment cycle is set to zero.

[0010] Optionally, obtaining the screen surface load index and the stop-flow threshold based on the relationship between the state parameters and the no-load reference parameters specifically includes: Compare the current state pressure difference of the current adjustment cycle with the no-load reference pressure difference, divide the difference between the two by the sum of the two to form a first ratio, and record the first ratio as zero when it is less than zero. The state amplitude of the current adjustment cycle is compared with the no-load reference amplitude. The difference between the two is divided by the sum of the two to form a second ratio. When the second ratio is less than zero, it is counted as zero. The no-load reference current is compared with the state current of the current regulation cycle. The difference between the two is divided by the no-load reference current to form a third ratio. When the third ratio is less than zero, it is counted as zero. The arithmetic mean of the first ratio, the second ratio, and the third ratio is used to form the screen load index for the current adjustment cycle; Use the trough depth of the current adjustment cycle as the stop-backflow threshold for the current adjustment cycle; When the screen load index is greater than or equal to the backflow stop threshold, the current adjustment cycle is set to an adjustment cycle that does not release the backflow of coarse particles on the screen. When the screen load index is less than the stop-reflow threshold, the current adjustment cycle is set to the adjustment cycle that allows the acquisition of the actual average mass flow rate of the reflow.

[0011] Optionally, obtaining the actual average quality flow rate of the backflow based on the backflow stop threshold, the buffer storage quality, and the maximum average quality flow rate of the backflow specifically includes: When the screen load index of the current adjustment cycle is greater than or equal to the stop-return threshold, the actual average mass flow rate of the current adjustment cycle is set to zero. When the screen load index of the current adjustment cycle is less than the stop-recirculation threshold: Divide the buffer warehouse inventory quality at the start of the current adjustment period by the duration of the adjustment period to form the average inventory flow rate for the current adjustment period. Multiply the theoretical average recirculation mass flow rate by one minus the screen load index to obtain the theoretical average recirculation mass flow rate after screen load correction. Compare the inventory-converted average flow rate, the theoretical average reflux mass flow rate after screen load correction, and the maximum average reflux mass flow rate of the current adjustment cycle, and take the minimum value as the actual average reflux mass flow rate of the current adjustment cycle. The reflux gate or reflux feeder is opened quantitatively according to the actual average reflux mass flow rate of the current adjustment cycle, and the coarse particles on the screen are kept entering the crushing zone according to the actual average reflux mass flow rate of the current adjustment cycle within the current adjustment cycle. When the average mass flow rate of new material entering the crushing zone during the current adjustment cycle is greater than or equal to the target total load flow rate, the theoretical average recirculation mass flow rate is set to zero, and the actual average recirculation mass flow rate during the current adjustment cycle is set to zero.

[0012] Optionally, updating the buffer warehouse inventory at the start of the next adjustment cycle based on the cumulative mass of coarse particles entering the reflux branch and the actual average reflux mass flow rate specifically includes: At the end of the current adjustment cycle, the cumulative mass of coarse particles on the screen that entered the reflux branch during the current adjustment cycle is added to the buffer warehouse inventory mass at the beginning of the current adjustment cycle. At the end of the current adjustment period, the actual average mass flow rate of the return flow in the current adjustment period is multiplied by the duration of the adjustment period to form the mass flow of the return flow that has been released during the current adjustment period. The mass of reflux released during the current adjustment cycle is deducted from the sum of the cumulative mass of coarse particles on the screen entering the reflux branch during the current adjustment cycle and the mass of the buffer warehouse at the beginning of the current adjustment cycle, to form the mass of the buffer warehouse at the beginning of the next adjustment cycle. The average mass flow of the actual return flow in the current adjustment cycle does not exceed the average flow of the inventory in the current adjustment cycle. The buffer warehouse inventory mass at the beginning of the next adjustment cycle is greater than or equal to zero. The quality of the buffer warehouse inventory at the start of the next adjustment cycle will be used as the initial inventory level for the next adjustment cycle.

[0013] Optionally, the step of obtaining the total load flow rate based on the average mass flow rate of the new material entering the crushing zone and the actual average mass flow rate of the return flow, and obtaining the crushing speed and crushing gap based on the deviation between the total load flow rate and the target total load flow rate, specifically includes: The average mass flow rate of new material entering the crushing zone during the current adjustment cycle is added to the average mass flow rate of actual return flow during the current adjustment cycle to form the total load flow rate entering the crushing zone during the current adjustment cycle. When the sum of the total load flow entering the crushing zone in the current adjustment cycle and the target total load flow is greater than zero, the difference between the two is divided by the sum of the two to form the total load deviation of the current adjustment cycle; when the sum of the total load flow entering the crushing zone in the current adjustment cycle and the target total load flow is equal to zero, the total load deviation of the current adjustment cycle is set to zero. The arithmetic mean of the maximum and minimum grinding speeds is used to form the center value of the grinding speed; the difference between the maximum and minimum grinding speeds is divided by two to form the grinding speed adjustment range; the grinding speed adjustment range is multiplied by the total load deviation of the current adjustment cycle and subtracted from the center value of the grinding speed to form the grinding speed of the current adjustment cycle. The arithmetic mean of the maximum and minimum grinding gaps is taken to form the center value of the grinding gap; the difference between the maximum and minimum grinding gaps is divided by two to form the grinding gap adjustment amplitude; the grinding gap adjustment amplitude is multiplied by the total load deviation of the current adjustment cycle and subtracted from the center value of the grinding gap to form the grinding gap of the current adjustment cycle.

[0014] Optionally, the continuous crushing and screening is performed according to the average mass flow rate of the new material entering the crushing zone, the actual average mass flow rate of the return flow, the crushing speed, and the crushing gap. Qualified particles under the screen are discharged, and coarse particles over the screen are guided into the buffer bin via the return branch. The status parameters for the next adjustment cycle are then updated. Specifically, this includes: During the current adjustment cycle, new material is continuously added according to the average mass flow rate of the new material entering the crushing zone during the current adjustment cycle. The coarse particles on the screen in the buffer bin are released evenly according to the actual average mass flow rate of the return flow during the current adjustment cycle. The crushing is performed according to the crushing speed and crushing gap of the current adjustment cycle to crush the total load flow rate entering the crushing zone during the current adjustment cycle. The crushed material is continuously fed into the screening section, and the qualified particles under the screen are directly discharged. The coarse particles on the screen are guided into the buffer bin through the return branch. Within the current adjustment cycle, samples of motor current, pressure difference between predetermined measuring points upstream and downstream of the screening section, and screen surface amplitude are collected, and the number of samples collected within the current adjustment cycle and the value of each sample are recorded. At the end of the current adjustment cycle, record the average mass flow rate of the new material entering the crushing zone during the current adjustment cycle, the target total load flow rate, the screen load index, the actual average mass flow rate of the return flow, the buffer warehouse inventory mass at the beginning of the next adjustment cycle, the total load flow rate entering the crushing zone during the current adjustment cycle, the crushing speed during the current adjustment cycle, and the crushing gap during the current adjustment cycle. The initial inventory of the buffer warehouse at the beginning of the next adjustment cycle is used as the initial inventory of the next adjustment cycle. The arithmetic mean of all motor current samples, the arithmetic mean of all differential pressure samples, and the arithmetic mean of all screen amplitude samples in the current adjustment cycle are used as the state current, state differential pressure, and state amplitude of the next adjustment cycle, respectively. When the addition of new material to the crushing zone is stopped, the cumulative mass of new material entering the crushing zone in subsequent adjustment cycles is set to zero, and continuous crushing and screening continue until an adjustment cycle is completed. The cycle ends when the following conditions are met: the cumulative mass of new material entering the crushing zone in the completed adjustment cycle is zero; the buffer warehouse inventory mass at the beginning of the next adjustment cycle after the completed adjustment cycle is zero; and the actual average mass flow rate of the return flow in the completed adjustment cycle is zero.

[0015] The present invention has the following beneficial effects: 1. Adjacent adjustment cycles are divided by the average travel time of tracer particles from the crushing inlet to the stable outflow of qualified particles from the screen. Within this cycle, the cumulative mass of new material, the cumulative mass of coarse particles entering the reflux branch, and the inventory mass in the buffer warehouse at the beginning of the cycle are collected. This binds the control cycle to the actual residence characteristics of the material in the crushing and screening channels, ensuring that the collected data naturally corresponds to the process window in which the same batch completes one transfer within the system. This avoids statistical misalignment and adjustment lag caused by fixed clock windows. When upstream material fluctuates or its properties change, the control cycle still matches the process response, more accurately reflecting the true contribution of reflux and inventory, and reducing misjudgments leading to excessive reflux release or reflux stoppage.

[0016] 2. By collecting samples of motor current, differential pressure at predetermined measuring points, and screen surface amplitude during no-load operation, no-load baseline parameters are established, and boundary parameters for crushing speed, crushing gap, and average reflux mass flow rate are set. Introducing the no-load baseline serves as a reference system for individual equipment differences, environmental changes, and sensor drift, allowing subsequent operating states to be interpreted based on relative changes rather than absolute values, thereby improving the robustness of load identification. When equipment wear, temperature rise, or batch-specific material differences cause signal baseline drift, the trend of screen surface load changes can still be stably judged, avoiding false stoppages or releases of reflux due to single threshold drift. Boundary parameters further ensure that adjustments do not exceed the safe and reasonable range of equipment and process, reducing energy consumption increases and particle size loss caused by over-adjustment.

[0017] 3. Based on the current adjustment cycle and the average mass flow rate of new material from previous adjustment cycles, and combined with the inventory mass flow rate in the buffer warehouse, obtain the target total load flow rate, the theoretical average recirculation mass flow rate, and the trough depth. The target total load setting is changed from a single-point instantaneous value to a cross-cycle smoothed quantity. Simultaneously, the inventory is incorporated into the theoretical recirculation capacity estimation, ensuring the target load follows long-term trends without excessively chasing short-term noise. The trough depth expresses the degree of material shortage using a unified scale, facilitating subsequent linkage with the screen surface load status. When upstream material supply experiences a short-term decrease or interruption, the system can replenish the crushing zone load through inventory recirculation, reducing particle size drift and sudden capacity drops caused by starvation in the crushing zone. When upstream material supply recovers, it can also suppress screen overload caused by excessive recirculation.

[0018] 4. Based on the relationship between the state parameters and the no-load reference parameters, obtain the screen load index and the stop-recirculation threshold. The relative changes in motor current, differential pressure, and screen amplitude jointly characterize the screen load state. Different mechanisms, such as increased differential pressure due to material abundance, current changes due to friction and resistance, and amplitude attenuation due to blockage or accumulation, are integrated into the same index system. The stop-recirculation threshold is correlated with the trough depth, creating a dynamic game between the system's material shortage level and the screen load risk. When the screen is close to overload, the stop-recirculation can be triggered in time to prevent coarse particles from continuing to flow back, causing screen blockage, abnormal vibration, and production line shutdown for cleaning. When the screen has sufficient margin and the load is low, recirculation is allowed to participate in load replenishment, thus balancing stable output and equipment safety.

[0019] 5. Based on the stop-return threshold, buffer inventory mass, and maximum average return mass flow rate, obtain the actual average return mass flow rate. Elevate return control from an on / off state to a quantitative release constrained by inventory, threshold, and upper limit, ensuring that return actions simultaneously meet the triple conditions of screen safety, inventory sustainability, and equipment capacity limits. When the screen load is high, the actual return flow can quickly drop to zero, avoiding overload; when the screen load is low and inventory is sufficient, return flow can be smoothly released within a tolerable range, avoiding a large-scale one-time return flow causing a shock; when inventory is insufficient, even if return flow is allowed, it will be constrained by inventory conversion capacity, preventing inventory depletion from leaving no room for adjustment in subsequent cycles.

[0020] 6. Update the buffer warehouse inventory at the start of the next adjustment cycle based on the cumulative mass of coarse particles entering the reflux branch and the actual average reflux mass flow rate. Periodically updating the inventory using the cumulative inflow and release volumes ensures that the buffer warehouse is no longer simply a matter of presence or absence, but rather a continuous state quantity that can be used for control decisions. Accurate inventory updates provide a reliable basis for subsequent reflux capacity assessments and reflux limit adjustments, fundamentally reducing over-reflux, negative inventory levels, or sudden reflux interruptions caused by inventory estimation errors. Simultaneously, the inventory is incorporated into the cycle time, enabling process engineers to judge the degree of material circulation and changes in screening efficiency based on inventory change trends.

[0021] 7. The total load flow rate is obtained from the average mass flow rate of the new material entering the crushing zone and the average mass flow rate of the actual return flow. The crushing speed and crushing gap are then determined based on the deviation between the total load and the target total load. By establishing the crushing section adjustment on this unified driving force of the total load deviation, the adjustment of the speed and gap is no longer isolated from the screening section status and return strategy, but converges in the same direction as the target load, forming an inherent consistency between crushing and screening. When the total load deviates from the target, the crushing parameters are continuously adjusted according to the deviation, which can reduce the drift of particle size distribution with load changes and reduce over-crushing or under-crushing caused by load fluctuations. Simultaneously, the crushing parameters are adjusted within the boundaries, balancing equipment protection and process stability.

[0022] 8. Continuous crushing and screening are performed according to the average mass flow rate of new material entering the crushing zone, the actual average mass flow rate of return flow, the crushing speed, and the crushing gap. Qualified particles under the screen are discharged, while coarse particles over the screen are guided into the buffer bin via the return branch, and the status parameters for the next adjustment cycle are updated. The execution actions, material destination, and status updates are all integrated into the same closed-loop cycle, forming a self-learning status refresh mechanism for continuous operation. This ensures that the status current, status differential pressure, and status amplitude for the next cycle are derived from the latest operating data rather than static settings. The system can continuously update status parameters according to changes in operating conditions, avoiding threshold distortion caused by outdated control data. The return path of coarse particles over the screen and the function of the buffer bin are clearly incorporated into the closed loop. The return flow serves both load balancing and is constrained by the screen surface load, thus simultaneously achieving stable production capacity, reduced screen clogging risk, and improved quality consistency in continuous production. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the process of the present invention. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] Example, refer to Figure 1 A continuous pulverization and sieving method for solid particles of traditional Chinese medicine, comprising: Adjacent adjustment cycles are divided by the average travel time of tracer particles from entering the crushing inlet to the stable outflow of qualified particles under the screen. The cumulative mass of new material entering the crushing zone, the cumulative mass of coarse particles on the screen entering the return branch, and the mass of buffer warehouse at the beginning of the current adjustment cycle are collected. Collect samples of motor current, differential pressure at predetermined measuring points, and screen surface amplitude during no-load operation to establish no-load reference parameters, and set boundary parameters for crushing speed, crushing gap, and average reflux mass flow rate. Based on the average mass flow rate of new material entering the crushing zone during the current adjustment cycle and the mass of material stored in the buffer warehouse during the previous adjustment cycle, the target total load flow rate, the theoretical average recirculation mass flow rate, and the trough depth are obtained. Based on the relationship between the state parameters and the no-load reference parameters, obtain the screen surface load index and the stop-flow threshold. The actual average quality flow rate of the backflow is obtained based on the backflow stop threshold, the buffer warehouse inventory quality, and the maximum average quality flow rate of the backflow. Update the buffer warehouse inventory at the start of the next adjustment cycle based on the cumulative mass of coarse particles entering the reflux branch and the actual average reflux mass flow rate. The total load flow rate is obtained based on the average mass flow rate of the new material entering the crushing zone and the actual average mass flow rate of the return flow. The crushing speed and crushing gap are obtained based on the deviation between the total load flow rate and the target total load flow rate. Continuous crushing and screening are performed based on the average mass flow rate of the new material entering the crushing zone, the actual average mass flow rate of the return flow, the crushing speed, and the crushing gap. Qualified particles under the screen are discharged, and coarse particles on the screen are introduced into the buffer chamber through the return branch, and the status parameters for the next adjustment cycle are updated.

[0026] By dividing adjacent adjustment cycles according to the average passage time of tracer particles, and simultaneously collecting the cumulative mass of new material entering the crushing zone, the cumulative mass of coarse particles entering the reflux branch, and the mass of materials stored in the buffer warehouse within each adjustment cycle, the problem of adjustment lag or misadjustment caused by the asynchrony between the data sampling window and the actual material response in continuous production is solved. By collecting motor current, measuring point pressure difference, and screen surface amplitude during no-load operation to establish a no-load benchmark and setting the boundaries of crushing speed, crushing gap, and average reflux mass flow rate, the problem of threshold inaccuracy caused by different equipment, different environments, and sensor drift is solved. Furthermore, by calculating the target total load, theoretical reflux capacity, and trough depth, and combining the changes in state parameters relative to the no-load benchmark to form the screen surface load index and the stop-reflux threshold, the actual reflux rate can be calculated. The average mass flow rate of the reflux system solves the problems of screen overload, screen blockage, and reflux impact caused by fixed reflux ratios or manual adjustment based on experience, which are common in existing technologies. At the same time, by linking the total load with the deviation of the target total load to obtain the crushing speed and crushing gap, it solves the problem of particle size and capacity drift when the feed fluctuates due to long-term fixed crushing section parameters. Finally, by performing crushing and screening on a cycle, the qualified particles under the screen are stably discharged, and the coarse particles on the screen are introduced into the buffer bin through the reflux branch and the status parameters of the next cycle are updated. This makes the reflux, inventory, crushing parameters and screen load converge in the same cycle. Compared with traditional open-loop or single-variable control methods, it can more reliably reduce the risk of screen overload, reduce ineffective cycles, and improve the stability and repeatability of continuous operation, without relying on exaggerated performance promises.

[0027] The adjacent adjustment cycles are divided based on the average travel time of the tracer particles from the pulverizing inlet to the stable outflow of qualified particles from the sieve. The cumulative mass of new material entering the pulverizing zone, the cumulative mass of coarse particles entering the return branch from the sieve, and the buffer warehouse inventory at the start of the current adjustment cycle are collected within the current adjustment cycle. Specifically, this includes: The average passage time of the tracer particles from the pulverizing inlet to the stable outflow of qualified particles under the sieve is used as the duration of the adjustment cycle. The tracer particles are particles pre-assigned with identifiable features and used to measure the travel time of materials from the crushing inlet to the outlet of qualified material under the screen. The continuous production process is divided into multiple adjustment cycles that are connected end to end, and each adjustment cycle is numbered according to the order of occurrence. Before the start of each adjustment cycle, the feeding metering unit measures the cumulative mass of new material entering the crushing zone during the current adjustment cycle; At the end of each adjustment cycle, the cumulative mass of coarse particles on the screen entering the reflux branch during the current adjustment cycle is measured. The average mass flow rate of new material entering the crushing zone during the current adjustment cycle is calculated by dividing the cumulative mass of new material entering the crushing zone during the current adjustment cycle by the duration of the adjustment cycle. Divide the cumulative mass of coarse particles on the screen entering the return branch during the current adjustment cycle by the duration of the adjustment cycle to form the average mass flow rate of coarse particles on the screen entering the return branch during the current adjustment cycle. The coarse particles on the sieve are introduced into the buffer bin via the reflux branch, and the mass of the buffer bin at the start of the current adjustment cycle is recorded.

[0028] The adjustment period is defined as the average travel time from when the tracer particles enter the crushing inlet to when the qualified material under the sieve flows out stably. ;in, The duration of one adjustment cycle; The continuous production process is divided into adjacent adjustment cycles, denoted as the first cycle. The index of each adjustment cycle is ;in, Number the discrete adjustment cycle; In the Before the start of each adjustment cycle, the feeding metering unit determines the cumulative mass of new material that will enter the crushing zone during that adjustment cycle, and records it as follows: ;in, For the first The cumulative mass of new material entering the crushing zone within one adjustment cycle; In the At the end of each adjustment cycle, the cumulative mass of coarse particles on the screen entering the reflux branch during that adjustment cycle is measured and recorded as follows: ;in, For the first The cumulative mass of coarse particles on the screen entering the reflux branch within one adjustment cycle; The corresponding average mass flow rates are as follows: , ;in, For the first Average mass flow rate of new material entering the crushing zone within one adjustment cycle; For the first The average mass flow rate of coarse particles entering the return branch within one adjustment cycle; The coarse particles from the sieve first enter the reflux buffer chamber, and this is recorded as the first... At the start of each adjustment cycle, the mass of coarse particles in the buffer bin is: .

[0029] The process involves collecting samples of motor current, differential pressure at predetermined measuring points, and sieve surface amplitude during no-load operation to establish no-load baseline parameters. Boundary parameters for the crushing speed, crushing gap, and average reflux mass flow rate are also set. Specifically, this includes: Before the formal feeding, the crusher and screener are run unloaded for one adjustment cycle under normal operating conditions, and discrete samples of motor current, pressure difference between predetermined measuring points upstream and downstream of the screening section, and screen surface amplitude are collected during the unloaded adjustment cycle. The arithmetic mean of all motor current samples collected during the no-load regulation cycle is taken to form the no-load reference current. The arithmetic mean of all differential pressure samples collected during the no-load regulation cycle is used to form the no-load reference differential pressure. The arithmetic mean of all screen surface amplitude samples collected during the no-load adjustment cycle is used to form the no-load reference amplitude. Obtain the minimum and maximum grinding speeds, minimum and maximum grinding gaps, and maximum average reflux mass flow rates allowed by the equipment. Set the buffer warehouse inventory quality to zero before the start of the first adjustment cycle at the first startup. Set the state current of the first adjustment cycle to the no-load reference current, set the state voltage difference of the first adjustment cycle to the no-load reference voltage difference, and set the state amplitude of the first adjustment cycle to the no-load reference amplitude. From the second adjustment cycle onwards: The arithmetic mean of all motor current samples collected in the previous completed adjustment cycle immediately preceding the current adjustment cycle is taken to form the state current of the current adjustment cycle. The arithmetic mean of all differential pressure samples collected in the previous completed regulation cycle immediately preceding the current regulation cycle is used to form the state differential pressure of the current regulation cycle. The arithmetic mean of all sieve surface amplitude samples collected in the previous completed adjustment cycle immediately preceding the current adjustment cycle is taken to form the state amplitude of the current adjustment cycle.

[0030] Before the formal feeding, the crusher and screener are run unloaded for one adjustment cycle under normal operating conditions, and discrete samples of motor current, pressure difference between predetermined measuring points upstream and downstream of the screening section and screen surface amplitude are collected. Let the sample size be... The sample number is The no-load reference current, no-load reference voltage difference, and no-load reference amplitude are defined as follows: , , ;in, This represents the total number of samples collected during the no-load adjustment cycle. For the first time under no-load reference condition One current sample; This is the no-load reference current; For the first time under no-load reference condition One pressure difference sample; The unloaded reference pressure difference; For the first time under no-load reference condition One sample of sieve surface amplitude; The unloaded reference amplitude; The minimum allowable grinding speed, maximum grinding speed, minimum grinding gap, maximum grinding gap, and maximum average reflux mass flow rate of the equipment are respectively denoted as: , , , , ; Set the inventory quality in the buffer bin at the first startup to [value]. ;in, The buffer warehouse inventory quality at the start of the first adjustment cycle; The first The state current, state voltage difference, and state amplitude used in each adjustment cycle are set as follows: , , ;in, This is the state current used in the first adjustment cycle; The differential pressure used in the first adjustment cycle; This is the state amplitude used in the first adjustment cycle; Let the number of samples collected in the previous completed adjustment cycle immediately preceding the current adjustment cycle be . The sample number is ,but: , , , ;in, To be adjacent to the current number The number of samples collected in the previous completed adjustment cycle before the current adjustment cycle; For the first The state current used in each adjustment cycle; For the first The differential pressure used in each adjustment cycle; For the first The state amplitude used in each adjustment cycle.

[0031] The process of obtaining the target total load flow rate, theoretically reversible average mass flow rate, and trough depth based on the average mass flow rate of new material entering the crushing zone during the current adjustment cycle and previous adjustment cycles, as well as the mass of material stored in the buffer warehouse, specifically includes: During the first adjustment cycle, the average mass flow rate of the new material entering the crushing zone during the first adjustment cycle is taken as the target total load flow rate for the first adjustment cycle. During the second adjustment cycle, the arithmetic mean of the average mass flow rate of the new material entering the crushing zone during the first adjustment cycle and the average mass flow rate of the new material entering the crushing zone during the second adjustment cycle is taken as the target total load flow rate for the second adjustment cycle. Starting from the third adjustment cycle, when the sum of the average mass flow rate of new material entering the crushing zone in the current adjustment cycle, the average mass flow rate of new material entering the crushing zone in the previous adjustment cycle, and the average mass flow rate of new material entering the crushing zone in the previous two adjustment cycles is greater than zero, the arithmetic mean of the average mass flow rate of new material entering the crushing zone in the current adjustment cycle, the average mass flow rate of new material entering the crushing zone in the previous adjustment cycle, and the average mass flow rate of new material entering the crushing zone in the previous two adjustment cycles is taken as the target total load flow rate for the current adjustment cycle. Starting from the third adjustment cycle, when the sum of the average mass flow rate of new material entering the crushing zone in the current adjustment cycle, the average mass flow rate of new material entering the crushing zone in the previous adjustment cycle, and the average mass flow rate of new material entering the crushing zone in the previous two adjustment cycles equals zero, the buffer warehouse inventory mass at the beginning of the current adjustment cycle is divided by the duration of the adjustment cycle to form the inventory-converted average flow rate of the current adjustment cycle. The inventory-converted average flow rate of the current adjustment cycle is then compared with the maximum return average mass flow rate, and the smaller value is taken as the target total load flow rate of the current adjustment cycle. For the current adjustment cycle, the target total load flow rate is compared with the average mass flow rate of new material entering the crushing zone during the current adjustment cycle. When the target total load flow rate is greater than the average mass flow rate of new material entering the crushing zone during the current adjustment cycle, the difference between the two is used as the theoretical average mass flow rate that can be returned. When the target total load flow rate is less than or equal to the average mass flow rate of new material entering the crushing zone during the current adjustment cycle, the theoretical average mass flow rate that can be returned is set to zero. When the target total load flow is greater than zero, the theoretical reversible average mass flow is divided by the target total load flow to form the trough depth of the current adjustment cycle; when the target total load flow is equal to zero, the trough depth of the current adjustment cycle is set to zero.

[0032] For the first For each adjustment cycle, the weighted average of the fresh material flow rates from the most recent three cycles is used as the target total load flow rate for that cycle. Specifically: , ; , ;in, The target total load flow for the first adjustment cycle; The target total load flow for the second adjustment cycle; For the first The target total load flow for each adjustment cycle; For the first For each adjustment cycle, first calculate the theoretically achievable coarse particle recirculation flow rate that can be added in that cycle, without considering the screen surface bearing capacity, denoted as: ;in, For the first The theoretical recirculation flow rate of each adjustment cycle without considering the screen surface load constraint; or It is a positive part function; The theoretical recirculation capacity is converted into a dimensionless trough depth, specifically: ;in, For the first The depth of the trough in each adjustment cycle.

[0033] The process of obtaining the screen surface load index and the stop-flow threshold based on the relationship between the state parameters and the no-load reference parameters specifically includes: Compare the current state pressure difference of the current adjustment cycle with the no-load reference pressure difference, divide the difference between the two by the sum of the two to form a first ratio, and record the first ratio as zero when it is less than zero. The state amplitude of the current adjustment cycle is compared with the no-load reference amplitude. The difference between the two is divided by the sum of the two to form a second ratio. When the second ratio is less than zero, it is counted as zero. The no-load reference current is compared with the state current of the current regulation cycle. The difference between the two is divided by the no-load reference current to form a third ratio. When the third ratio is less than zero, it is counted as zero. The arithmetic mean of the first ratio, the second ratio, and the third ratio is used to form the screen load index for the current adjustment cycle; Use the trough depth of the current adjustment cycle as the stop-backflow threshold for the current adjustment cycle; When the screen load index is greater than or equal to the backflow stop threshold, the current adjustment cycle is set to an adjustment cycle that does not release the backflow of coarse particles on the screen. When the screen load index is less than the stop-reflow threshold, the current adjustment cycle is set to the adjustment cycle that allows the acquisition of the actual average mass flow rate of the reflow.

[0034] For the first For each adjustment cycle, a dimensionless screen surface load index is constructed using the corresponding state current, state pressure difference, and state amplitude. Specifically: ;in, For the first Screen load index for each adjustment cycle; This characterizes the degree of pressure difference increase relative to the no-load reference during the current cycle. Characterizes the degree of current rise relative to the no-load reference in the current cycle. Characterizes the degree of amplitude decay of the current cycle relative to the unloaded reference; The stop-backflow threshold for this cycle is denoted as: ;in, For the first The threshold for stopping backflow in each adjustment cycle; when When this occurs, it is determined that no coarse particles are released for reflux during that cycle; when When the time is right, it is determined that the actual average quality flow rate of the return flow is allowed to be obtained based on the stop return flow threshold, the buffer warehouse inventory quality, and the maximum average quality flow rate of the return flow.

[0035] The process of obtaining the actual average quality flow rate of the backflow based on the backflow stop threshold, the buffer storage quality, and the maximum average quality flow rate of the backflow specifically includes: When the screen load index of the current adjustment cycle is greater than or equal to the stop-return threshold, the actual average mass flow rate of the current adjustment cycle is set to zero. When the screen load index of the current adjustment cycle is less than the stop-recirculation threshold: Divide the buffer warehouse inventory quality at the start of the current adjustment period by the duration of the adjustment period to form the average inventory flow rate for the current adjustment period. Multiply the theoretical average recirculation mass flow rate by one minus the screen load index to obtain the theoretical average recirculation mass flow rate after screen load correction. Compare the inventory-converted average flow rate, the theoretical average reflux mass flow rate after screen load correction, and the maximum average reflux mass flow rate of the current adjustment cycle, and take the minimum value as the actual average reflux mass flow rate of the current adjustment cycle. The reflux gate or reflux feeder is opened quantitatively according to the actual average reflux mass flow rate of the current adjustment cycle, and the coarse particles on the screen are kept entering the crushing zone according to the actual average reflux mass flow rate of the current adjustment cycle within the current adjustment cycle. When the average mass flow rate of new material entering the crushing zone during the current adjustment cycle is greater than or equal to the target total load flow rate, the theoretical average recirculation mass flow rate is set to zero, and the actual average recirculation mass flow rate during the current adjustment cycle is set to zero.

[0036] In the Calculate the actual coarse particle return flow rate released into the grinding zone within each adjustment cycle: ;in, For the first The actual return flow rate for each adjustment cycle; according to The reflux gate or reflux feeder is opened quantitatively to allow coarse particles to enter the crushing zone at a constant mass flow rate within the adjustment cycle. when Sometimes, and obtain .

[0037] The step of updating the buffer warehouse inventory at the start of the next adjustment cycle based on the cumulative mass of coarse particles entering the reflux branch and the actual average reflux mass flow rate includes: At the end of the current adjustment cycle, the cumulative mass of coarse particles on the screen that entered the reflux branch during the current adjustment cycle is added to the buffer warehouse inventory mass at the beginning of the current adjustment cycle. At the end of the current adjustment period, the actual average mass flow rate of the return flow in the current adjustment period is multiplied by the duration of the adjustment period to form the mass flow of the return flow that has been released during the current adjustment period. The mass of reflux released during the current adjustment cycle is deducted from the sum of the cumulative mass of coarse particles on the screen entering the reflux branch during the current adjustment cycle and the mass of the buffer warehouse at the beginning of the current adjustment cycle, to form the mass of the buffer warehouse at the beginning of the next adjustment cycle. The average mass flow of the actual return flow in the current adjustment cycle does not exceed the average flow of the inventory in the current adjustment cycle. The buffer warehouse inventory mass at the beginning of the next adjustment cycle is greater than or equal to zero. The quality of the buffer warehouse inventory at the start of the next adjustment cycle will be used as the initial inventory level for the next adjustment cycle.

[0038] In the At the end of each adjustment cycle, the coarse particles from the sieve of that cycle flow into the buffer bin, and the reflux volume released during that cycle is deducted to obtain the inventory quality at the start of the next cycle: ;in, For the first The quality of the buffer warehouse at the beginning of each adjustment cycle; Depend on ,get: ; All coarse particles produced on the sieve this period will be incorporated into... The next cycle will begin with As available inventory.

[0039] The process of obtaining the total load flow rate based on the average mass flow rate of the new material entering the crushing zone and the actual average mass flow rate of the return flow, and obtaining the crushing speed and crushing gap based on the deviation between the total load flow rate and the target total load flow rate, specifically includes: The average mass flow rate of new material entering the crushing zone during the current adjustment cycle is added to the average mass flow rate of actual return flow during the current adjustment cycle to form the total load flow rate entering the crushing zone during the current adjustment cycle. When the sum of the total load flow entering the crushing zone in the current adjustment cycle and the target total load flow is greater than zero, the difference between the two is divided by the sum of the two to form the total load deviation of the current adjustment cycle; when the sum of the total load flow entering the crushing zone in the current adjustment cycle and the target total load flow is equal to zero, the total load deviation of the current adjustment cycle is set to zero. The arithmetic mean of the maximum and minimum grinding speeds is used to form the center value of the grinding speed; the difference between the maximum and minimum grinding speeds is divided by two to form the grinding speed adjustment range; the grinding speed adjustment range is multiplied by the total load deviation of the current adjustment cycle and subtracted from the center value of the grinding speed to form the grinding speed of the current adjustment cycle. The arithmetic mean of the maximum and minimum grinding gaps is taken to form the center value of the grinding gap; the difference between the maximum and minimum grinding gaps is divided by two to form the grinding gap adjustment amplitude; the grinding gap adjustment amplitude is multiplied by the total load deviation of the current adjustment cycle and subtracted from the center value of the grinding gap to form the grinding gap of the current adjustment cycle.

[0040] Adding the fresh material flow rate of this cycle to the return flow rate of this cycle, we obtain the total load flow rate entering the crushing zone for this cycle: ;in, For the first The total load flow entering the crushing zone in each adjustment cycle; The dimensionless total load deviation is constructed as follows: ;in, For the first Total load deviation for each adjustment cycle; No. The crushing speed for each adjustment cycle is taken as: ; No. The crushing gap for each adjustment cycle is taken as: .

[0041] The process involves continuous crushing and sieving based on the average mass flow rate of the new material entering the crushing zone, the actual average mass flow rate of the return flow, the crushing speed, and the crushing gap. Qualified particles are discharged from the screen, while coarse particles on the screen are guided into the buffer chamber via the return branch. The status parameters for the next adjustment cycle are then updated. Specifically, this includes: During the current adjustment cycle, new material is continuously added according to the average mass flow rate of the new material entering the crushing zone during the current adjustment cycle. The coarse particles on the screen in the buffer bin are released evenly according to the actual average mass flow rate of the return flow during the current adjustment cycle. The crushing is performed according to the crushing speed and crushing gap of the current adjustment cycle to crush the total load flow rate entering the crushing zone during the current adjustment cycle. The crushed material is continuously fed into the screening section, and the qualified particles under the screen are directly discharged. The coarse particles on the screen are guided into the buffer bin through the return branch. Within the current adjustment cycle, samples of motor current, pressure difference between predetermined measuring points upstream and downstream of the screening section, and screen surface amplitude are collected, and the number of samples collected within the current adjustment cycle and the value of each sample are recorded. At the end of the current adjustment cycle, record the average mass flow rate of the new material entering the crushing zone during the current adjustment cycle, the target total load flow rate, the screen load index, the actual average mass flow rate of the return flow, the buffer warehouse inventory mass at the beginning of the next adjustment cycle, the total load flow rate entering the crushing zone during the current adjustment cycle, the crushing speed during the current adjustment cycle, and the crushing gap during the current adjustment cycle. The initial inventory of the buffer warehouse at the beginning of the next adjustment cycle is used as the initial inventory of the next adjustment cycle. The arithmetic mean of all motor current samples, the arithmetic mean of all differential pressure samples, and the arithmetic mean of all screen amplitude samples in the current adjustment cycle are used as the state current, state differential pressure, and state amplitude of the next adjustment cycle, respectively. When the addition of new material to the crushing zone is stopped, the cumulative mass of new material entering the crushing zone in subsequent adjustment cycles is set to zero, and continuous crushing and screening continue until an adjustment cycle is completed. The cycle ends when the following conditions are met: the cumulative mass of new material entering the crushing zone in the completed adjustment cycle is zero; the buffer warehouse inventory mass at the beginning of the next adjustment cycle after the completed adjustment cycle is zero; and the actual average mass flow rate of the return flow in the completed adjustment cycle is zero.

[0042] In the Within each adjustment cycle, according to Add new materials continuously, according to Evenly release the coarse particles in the buffer chamber, press and The total load entering the crushing zone is crushed, and the crushed material is continuously fed into the screening section. The qualified particles under the screen are directly discharged, and the coarse particles on the screen enter the buffer chamber. During this adjustment cycle, the motor current, the pressure difference between the upstream and downstream predetermined measuring points of the screening section, and the screen surface amplitude samples are collected. Let the number of samples collected during this adjustment period be... The sample number is The corresponding samples are denoted as follows: , and ;in, For the first The number of samples collected within each adjustment cycle; For the first Within the first adjustment cycle, the first One current sample; For the first Within the first adjustment cycle, the first One pressure difference sample; For the first Within the first adjustment cycle, the first One amplitude sample; In the At the end of each adjustment cycle, the main execution results of that cycle are recorded as follows: ;in, For the first A set of execution records for each adjustment cycle; by The initial inventory level for the next adjustment cycle is used as the initial inventory level, and the average value of the samples in the latest completed adjustment cycle is used as the state current, state voltage difference and state amplitude for the next adjustment cycle, respectively. When the upstream feed stops, the mass of the new material in each subsequent adjustment cycle is set to 0, and continuous crushing and screening continue until a completed adjustment cycle ends and the following conditions are met simultaneously: , , The event will end at that time.

[0043] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0044] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A continuous pulverizing and sieving method for solid granules of traditional Chinese medicine, characterized in that, include: Adjacent adjustment cycles are divided by the average travel time of tracer particles from entering the crushing inlet to the stable outflow of qualified particles under the screen. The cumulative mass of new material entering the crushing zone, the cumulative mass of coarse particles on the screen entering the return branch, and the mass of buffer warehouse at the beginning of the current adjustment cycle are collected. Collect samples of motor current, differential pressure at predetermined measuring points, and screen surface amplitude during no-load operation to establish no-load reference parameters, and set boundary parameters for crushing speed, crushing gap, and average reflux mass flow rate. Based on the average mass flow rate of new material entering the crushing zone during the current adjustment cycle and the mass of material stored in the buffer warehouse during the previous adjustment cycle, the target total load flow rate, the theoretical average recirculation mass flow rate, and the trough depth are obtained. Based on the relationship between the state parameters and the no-load reference parameters, obtain the screen surface load index and the stop-flow threshold. The actual average quality flow rate of the backflow is obtained based on the backflow stop threshold, the buffer warehouse inventory quality, and the maximum average quality flow rate of the backflow. Update the buffer warehouse inventory at the start of the next adjustment cycle based on the cumulative mass of coarse particles entering the reflux branch and the actual average reflux mass flow rate. The total load flow rate is obtained based on the average mass flow rate of the new material entering the crushing zone and the actual average mass flow rate of the return flow. The crushing speed and crushing gap are obtained based on the deviation between the total load flow rate and the target total load flow rate. Continuous crushing and screening are performed based on the average mass flow rate of the new material entering the crushing zone, the actual average mass flow rate of the return flow, the crushing speed, and the crushing gap. Qualified particles under the screen are discharged, and coarse particles on the screen are introduced into the buffer chamber through the return branch, and the status parameters for the next adjustment cycle are updated.

2. The continuous pulverization and sieving method for solid particles of traditional Chinese medicine according to claim 1, characterized in that, The adjacent adjustment cycles are divided based on the average travel time of the tracer particles from the pulverizing inlet to the stable outflow of qualified particles from the sieve. The cumulative mass of new material entering the pulverizing zone, the cumulative mass of coarse particles entering the return branch from the sieve, and the buffer warehouse inventory at the start of the current adjustment cycle are collected within the current adjustment cycle. Specifically, this includes: The average passage time of the tracer particles from the pulverizing inlet to the stable outflow of qualified particles under the sieve is used as the duration of the adjustment cycle. The continuous production process is divided into multiple adjustment cycles that are connected end to end, and each adjustment cycle is numbered according to the order of occurrence. Before the start of each adjustment cycle, the feeding metering unit measures the cumulative mass of new material entering the crushing zone during the current adjustment cycle; At the end of each adjustment cycle, the cumulative mass of coarse particles on the screen entering the reflux branch during the current adjustment cycle is measured. The average mass flow rate of new material entering the crushing zone during the current adjustment cycle is calculated by dividing the cumulative mass of new material entering the crushing zone during the current adjustment cycle by the duration of the adjustment cycle. Divide the cumulative mass of coarse particles on the screen entering the return branch during the current adjustment cycle by the duration of the adjustment cycle to form the average mass flow rate of coarse particles on the screen entering the return branch during the current adjustment cycle. The coarse particles on the sieve are introduced into the buffer bin via the reflux branch, and the mass of the buffer bin at the start of the current adjustment cycle is recorded.

3. The continuous pulverization and sieving method for solid particles of traditional Chinese medicine according to claim 2, characterized in that, The process involves collecting samples of motor current, differential pressure at predetermined measuring points, and sieve surface amplitude during no-load operation to establish no-load baseline parameters. Boundary parameters for the crushing speed, crushing gap, and average reflux mass flow rate are also set. Specifically, this includes: Before the formal feeding, the crusher and screener are run unloaded for one adjustment cycle under normal operating conditions, and discrete samples of motor current, pressure difference between predetermined measuring points upstream and downstream of the screening section, and screen surface amplitude are collected during the unloaded adjustment cycle. The arithmetic mean of all motor current samples collected during the no-load regulation cycle is taken to form the no-load reference current. The arithmetic mean of all differential pressure samples collected during the no-load regulation cycle is used to form the no-load reference differential pressure. The arithmetic mean of all screen surface amplitude samples collected during the no-load adjustment cycle is used to form the no-load reference amplitude. Obtain the minimum and maximum grinding speeds, minimum and maximum grinding gaps, and maximum average reflux mass flow rates allowed by the equipment. Set the buffer warehouse inventory quality to zero before the start of the first adjustment cycle at the first startup. Set the state current of the first adjustment cycle to the no-load reference current, set the state voltage difference of the first adjustment cycle to the no-load reference voltage difference, and set the state amplitude of the first adjustment cycle to the no-load reference amplitude. From the second adjustment cycle onwards: The arithmetic mean of all motor current samples collected in the previous completed adjustment cycle immediately preceding the current adjustment cycle is taken to form the state current of the current adjustment cycle. The arithmetic mean of all differential pressure samples collected in the previous completed regulation cycle immediately preceding the current regulation cycle is used to form the state differential pressure of the current regulation cycle. The arithmetic mean of all sieve surface amplitude samples collected in the previous completed adjustment cycle immediately preceding the current adjustment cycle is taken to form the state amplitude of the current adjustment cycle.

4. The continuous pulverization and sieving method for solid particles of traditional Chinese medicine according to claim 3, characterized in that, The process of obtaining the target total load flow rate, theoretically reversible average mass flow rate, and trough depth based on the average mass flow rate of new material entering the crushing zone during the current adjustment cycle and previous adjustment cycles, as well as the mass of material stored in the buffer warehouse, specifically includes: During the first adjustment cycle, the average mass flow rate of the new material entering the crushing zone during the first adjustment cycle is taken as the target total load flow rate for the first adjustment cycle. During the second adjustment cycle, the arithmetic mean of the average mass flow rate of the new material entering the crushing zone during the first adjustment cycle and the average mass flow rate of the new material entering the crushing zone during the second adjustment cycle is taken as the target total load flow rate for the second adjustment cycle. Starting from the third adjustment cycle, when the sum of the average mass flow rate of new material entering the crushing zone in the current adjustment cycle, the average mass flow rate of new material entering the crushing zone in the previous adjustment cycle, and the average mass flow rate of new material entering the crushing zone in the previous two adjustment cycles is greater than zero, the arithmetic mean of the average mass flow rate of new material entering the crushing zone in the current adjustment cycle, the average mass flow rate of new material entering the crushing zone in the previous adjustment cycle, and the average mass flow rate of new material entering the crushing zone in the previous two adjustment cycles is taken as the target total load flow rate for the current adjustment cycle. Starting from the third adjustment cycle, when the sum of the average mass flow rate of new material entering the crushing zone in the current adjustment cycle, the average mass flow rate of new material entering the crushing zone in the previous adjustment cycle, and the average mass flow rate of new material entering the crushing zone in the previous two adjustment cycles equals zero, the buffer warehouse inventory mass at the beginning of the current adjustment cycle is divided by the duration of the adjustment cycle to form the inventory-converted average flow rate of the current adjustment cycle. The inventory-converted average flow rate of the current adjustment cycle is then compared with the maximum return average mass flow rate, and the smaller value is taken as the target total load flow rate of the current adjustment cycle. For the current adjustment cycle, the target total load flow rate is compared with the average mass flow rate of new material entering the crushing zone during the current adjustment cycle. When the target total load flow rate is greater than the average mass flow rate of new material entering the crushing zone during the current adjustment cycle, the difference between the two is used as the theoretical average mass flow rate that can be returned. When the target total load flow rate is less than or equal to the average mass flow rate of new material entering the crushing zone during the current adjustment cycle, the theoretical average mass flow rate that can be returned is set to zero. When the target total load flow is greater than zero, the theoretical reversible average mass flow is divided by the target total load flow to form the trough depth of the current adjustment cycle; when the target total load flow is equal to zero, the trough depth of the current adjustment cycle is set to zero.

5. A continuous pulverizing and sieving method for solid particles of traditional Chinese medicine according to claim 4, characterized in that, The process of obtaining the screen surface load index and the stop-flow threshold based on the relationship between the state parameters and the no-load reference parameters specifically includes: Compare the current state pressure difference of the current adjustment cycle with the no-load reference pressure difference, divide the difference between the two by the sum of the two to form a first ratio, and record the first ratio as zero when it is less than zero. The state amplitude of the current adjustment cycle is compared with the no-load reference amplitude. The difference between the two is divided by the sum of the two to form a second ratio. When the second ratio is less than zero, it is counted as zero. The no-load reference current is compared with the state current of the current regulation cycle. The difference between the two is divided by the no-load reference current to form a third ratio. When the third ratio is less than zero, it is counted as zero. The arithmetic mean of the first ratio, the second ratio, and the third ratio is used to form the screen load index for the current adjustment cycle; Use the trough depth of the current adjustment cycle as the stop-backflow threshold for the current adjustment cycle; When the screen load index is greater than or equal to the backflow stop threshold, the current adjustment cycle is set to an adjustment cycle that does not release the backflow of coarse particles on the screen. When the screen load index is less than the stop-reflow threshold, the current adjustment cycle is set to the adjustment cycle that allows the acquisition of the actual average mass flow rate of the reflow.

6. A continuous pulverizing and sieving method for solid particles of traditional Chinese medicine according to claim 5, characterized in that, The process of obtaining the actual average quality flow rate of the backflow based on the backflow stop threshold, the buffer storage quality, and the maximum average quality flow rate of the backflow specifically includes: When the screen load index of the current adjustment cycle is greater than or equal to the stop-return threshold, the actual average mass flow rate of the current adjustment cycle is set to zero. When the screen load index of the current adjustment cycle is less than the stop-recirculation threshold: Divide the buffer warehouse inventory quality at the start of the current adjustment period by the duration of the adjustment period to form the average inventory flow rate for the current adjustment period. Multiply the theoretical average recirculation mass flow rate by one minus the screen load index to obtain the theoretical average recirculation mass flow rate after screen load correction. Compare the inventory-converted average flow rate, the theoretical average reflux mass flow rate after screen load correction, and the maximum average reflux mass flow rate of the current adjustment cycle, and take the minimum value as the actual average reflux mass flow rate of the current adjustment cycle. The reflux gate or reflux feeder is opened quantitatively according to the actual average reflux mass flow rate of the current adjustment cycle, and the coarse particles on the screen are kept entering the crushing zone according to the actual average reflux mass flow rate of the current adjustment cycle within the current adjustment cycle. When the average mass flow rate of new material entering the crushing zone during the current adjustment cycle is greater than or equal to the target total load flow rate, the theoretical average recirculation mass flow rate is set to zero, and the actual average recirculation mass flow rate during the current adjustment cycle is set to zero.

7. A continuous pulverizing and sieving method for solid particles of traditional Chinese medicine according to claim 6, characterized in that, The step of updating the buffer warehouse inventory at the start of the next adjustment cycle based on the cumulative mass of coarse particles entering the reflux branch and the actual average reflux mass flow rate includes: At the end of the current adjustment cycle, the cumulative mass of coarse particles on the screen that entered the reflux branch during the current adjustment cycle is added to the buffer warehouse inventory mass at the beginning of the current adjustment cycle. At the end of the current adjustment period, the actual average mass flow rate of the return flow in the current adjustment period is multiplied by the duration of the adjustment period to form the mass flow of the return flow that has been released during the current adjustment period. The mass of reflux released during the current adjustment cycle is deducted from the sum of the cumulative mass of coarse particles on the screen entering the reflux branch during the current adjustment cycle and the mass of the buffer warehouse at the beginning of the current adjustment cycle, to form the mass of the buffer warehouse at the beginning of the next adjustment cycle. The average mass flow of the actual return flow in the current adjustment cycle does not exceed the average flow of the inventory in the current adjustment cycle. The buffer warehouse inventory mass at the beginning of the next adjustment cycle is greater than or equal to zero. The quality of the buffer warehouse inventory at the start of the next adjustment cycle will be used as the initial inventory level for the next adjustment cycle.

8. A continuous pulverizing and sieving method for solid particles of traditional Chinese medicine according to claim 7, characterized in that, The process of obtaining the total load flow rate based on the average mass flow rate of the new material entering the crushing zone and the actual average mass flow rate of the return flow, and obtaining the crushing speed and crushing gap based on the deviation between the total load flow rate and the target total load flow rate, specifically includes: The average mass flow rate of new material entering the crushing zone during the current adjustment cycle is added to the average mass flow rate of actual return flow during the current adjustment cycle to form the total load flow rate entering the crushing zone during the current adjustment cycle. When the sum of the total load flow entering the crushing zone in the current adjustment cycle and the target total load flow is greater than zero, the difference between the two is divided by the sum of the two to form the total load deviation of the current adjustment cycle; when the sum of the total load flow entering the crushing zone in the current adjustment cycle and the target total load flow is equal to zero, the total load deviation of the current adjustment cycle is set to zero. The arithmetic mean of the maximum and minimum grinding speeds is used to form the center value of the grinding speed; the difference between the maximum and minimum grinding speeds is divided by two to form the grinding speed adjustment range; the grinding speed adjustment range is multiplied by the total load deviation of the current adjustment cycle and subtracted from the center value of the grinding speed to form the grinding speed of the current adjustment cycle. The arithmetic mean of the maximum and minimum grinding gaps is taken to form the center value of the grinding gap; the difference between the maximum and minimum grinding gaps is divided by two to form the grinding gap adjustment amplitude; the grinding gap adjustment amplitude is multiplied by the total load deviation of the current adjustment cycle and subtracted from the center value of the grinding gap to form the grinding gap of the current adjustment cycle.

9. A continuous pulverizing and sieving method for solid particles of traditional Chinese medicine according to claim 8, characterized in that, The process involves continuous crushing and sieving based on the average mass flow rate of the new material entering the crushing zone, the actual average mass flow rate of the return flow, the crushing speed, and the crushing gap. Qualified particles are discharged from the screen, while coarse particles on the screen are guided into the buffer chamber via the return branch. The status parameters for the next adjustment cycle are then updated. Specifically, this includes: During the current adjustment cycle, new material is continuously added according to the average mass flow rate of the new material entering the crushing zone during the current adjustment cycle. The coarse particles on the screen in the buffer bin are released evenly according to the actual average mass flow rate of the return flow during the current adjustment cycle. The crushing is performed according to the crushing speed and crushing gap of the current adjustment cycle to crush the total load flow rate entering the crushing zone during the current adjustment cycle. The crushed material is continuously fed into the screening section, and the qualified particles under the screen are directly discharged. The coarse particles on the screen are guided into the buffer bin through the return branch. Within the current adjustment cycle, samples of motor current, pressure difference between predetermined measuring points upstream and downstream of the screening section, and screen surface amplitude are collected, and the number of samples collected within the current adjustment cycle and the value of each sample are recorded. At the end of the current adjustment cycle, record the average mass flow rate of the new material entering the crushing zone during the current adjustment cycle, the target total load flow rate, the screen load index, the actual average mass flow rate of the return flow, the buffer warehouse inventory mass at the beginning of the next adjustment cycle, the total load flow rate entering the crushing zone during the current adjustment cycle, the crushing speed during the current adjustment cycle, and the crushing gap during the current adjustment cycle. The initial inventory of the buffer warehouse at the beginning of the next adjustment cycle is used as the initial inventory of the next adjustment cycle. The arithmetic mean of all motor current samples, the arithmetic mean of all differential pressure samples, and the arithmetic mean of all screen amplitude samples in the current adjustment cycle are used as the state current, state differential pressure, and state amplitude of the next adjustment cycle, respectively. When the addition of new material to the crushing zone is stopped, the cumulative mass of new material entering the crushing zone in subsequent adjustment cycles is set to zero, and continuous crushing and screening continue until an adjustment cycle is completed. The cycle ends when the following conditions are met: the cumulative mass of new material entering the crushing zone in the completed adjustment cycle is zero; the buffer warehouse inventory mass at the beginning of the next adjustment cycle after the completed adjustment cycle is zero; and the actual average mass flow rate of the return flow in the completed adjustment cycle is zero.

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