CN-122006887-A - Continuous crushing and screening method for traditional Chinese medicine solid particles

CN122006887ACN 122006887 ACN122006887 ACN 122006887ACN-122006887-A

Abstract

The invention relates to the technical field of process control, and discloses a continuous crushing and screening method for solid particles of traditional Chinese medicine. Dividing an adjustment period by the average passing time of trace particles, collecting new material accumulation amount, coarse particle reflux accumulation amount on a sieve and buffer warehouse inventory in the period, establishing a reference for no-load collection current, pressure difference and amplitude, setting a rotating speed, a gap and a reflux boundary, calculating a target total load, a theoretical reflux amount and a trough depth according to a preamble and the current new material flow and inventory, obtaining a sieve face load index and a reflux stopping threshold value by combining a state relative reference, obtaining actual reflux amount and updating inventory, regulating the rotating speed and the gap according to the total load deviation, continuously crushing, sieving and updating the state. Therefore, the sampling and material response are synchronous, threshold drift is restrained, 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.

Inventors

PENG DELIAN
ZHAO CHANGPING
ZHANG WEN
XIANG JINGLAI
JIANG SHENYANG
JIANG RUIYUE

Assignees

温兄控股集团股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260414

Claims (9)

1. A continuous pulverizing and sieving method for solid particles of a traditional Chinese medicine, comprising: Dividing adjacent adjusting periods by the average passing time from the crushing inlet to stable outflow of qualified particles under the screen, and collecting the accumulated mass of new materials entering the crushing area in the current adjusting period, the accumulated mass of coarse particles on the screen entering the reflux branch and the buffer warehouse storage mass at the beginning of the current adjusting period; Collecting motor current, preset measuring point differential pressure and screen surface amplitude samples during idle running, establishing idle reference parameters, and setting boundary parameters of crushing rotating speed, crushing gap and reflux average mass flow; Obtaining a target total load flow, a theoretical reflowable average mass flow and trough depth according to the average mass flow of new materials entering a crushing area and the inventory quality of a buffer bin in the current regulation period and the existing preamble regulation period; acquiring a screen surface load index and a backflow stopping threshold according to the change relation of the state parameter relative to the no-load reference parameter; Acquiring actual reflux average mass flow according to the reflux stopping threshold value, the buffer warehouse storage mass and the maximum reflux average mass flow; Updating the storage mass of the buffer warehouse at the beginning of the next regulation period according to the accumulated mass of coarse particles on the screen entering the reflux branch and the actual reflux average mass flow; Acquiring total load flow according to the average mass flow of the new material and the actual average mass flow of the backflow entering the crushing zone, and acquiring crushing rotating speed and crushing gap according to the deviation between the total load flow and the target total load flow; And continuously crushing and screening according to the average mass flow of the new material, the actual average mass flow of the backflow, the crushing rotating speed and the crushing gap, discharging qualified particles below the screen, guiding coarse particles above the screen into a buffer bin through a backflow branch, and updating the state parameters of the next regulation period.
2. The continuous pulverizing and sieving method for solid particles of Chinese medicinal materials according to claim 1, wherein the steps of dividing adjacent adjustment periods by the average passing time of trace particles from the pulverizing inlet to stable outflow of qualified particles under the sieve, and collecting the accumulated mass of new materials entering the pulverizing zone in the current adjustment period, the accumulated mass of coarse particles on the sieve entering the reflux branch and the stock mass of the buffer bin at the beginning of the current adjustment period comprise: Taking the average passing time of the tracer particles from the crushing inlet to the stable outflow of the qualified particles under the screen as the duration of the regulating period; Dividing the continuous production process into a plurality of regulating periods connected end to end, and numbering each regulating period according to the occurrence sequence; Before each adjusting period starts, a feeding metering unit meters the accumulated mass of new materials entering a crushing area in the current adjusting period; At the end of each conditioning cycle, metering the accumulated mass of coarse particles on the screen entering the return branch in the current conditioning cycle; dividing the accumulated mass of the new materials entering the crushing zone in the current regulation period by the duration of the regulation period to form the average mass flow of the new materials entering the crushing zone in the current regulation period; Dividing the accumulated mass of coarse particles on the screen entering the reflux branch in the current regulation period by the duration of the regulation period to form the average mass flow of the coarse particles on the screen entering the reflux branch in the current regulation period; coarse particles on the sieve are led into a buffering warehouse through a reflux branch, and the storage quantity of the buffering warehouse at the beginning of the current adjusting period is recorded.
3. The method for continuously pulverizing and sieving solid particles of Chinese medicine according to claim 2, wherein the steps of collecting motor current, preset measuring point differential pressure and sieve surface amplitude samples during idle running, establishing idle reference parameters, and setting boundary parameters of pulverizing rotation speed, pulverizing gap and reflux average mass flow rate comprise: Before formal feeding, the pulverizer and the screening machine run in an idle mode for an adjustment period in a normal running state, and discrete samples of motor current, differential pressure of preset measuring points at the upstream and downstream of the screening section and screen surface amplitude are collected in the idle adjustment period; all motor current samples acquired in the empty load regulation period are subjected to arithmetic mean value to form an empty load reference current; Taking an arithmetic average value of all differential pressure samples acquired in the empty load adjusting period to form an empty load reference differential pressure; taking an arithmetic average value of all screen surface amplitude samples acquired in the empty load adjusting period to form an empty load reference amplitude; acquiring the minimum grinding rotating speed, the maximum grinding rotating speed, the minimum grinding gap, the maximum grinding gap and the maximum reflux average mass flow rate allowed by the equipment; Setting the storage quantity of the buffer warehouse before the first regulation period starts at the first startup to be zero; setting the state current of the first regulation period as an idle reference current, setting the state differential pressure of the first regulation period as an idle reference differential pressure, and setting the state amplitude of the first regulation period as an idle reference amplitude; From the second conditioning cycle: taking an arithmetic average value of all motor current samples acquired in a finished regulation period immediately before the current regulation period to form a state current of the current regulation period; Taking an arithmetic average value of all differential pressure samples acquired in a finished adjusting period immediately before the current adjusting period to form a state differential pressure of the current adjusting period; and taking an arithmetic average value of all screen surface amplitude samples acquired in a finished adjusting period immediately before the current adjusting period to form the state amplitude of the current adjusting period.
4. The continuous pulverizing and sieving method for solid particles of Chinese medicinal materials according to claim 3, wherein the obtaining the target total load flow, the theoretical reflowable average mass flow and the trough depth according to the average mass flow of the new materials entering the pulverizing zone and the stock mass of the buffer bin in the current adjusting period and the existing pre-adjusting period comprises the following steps: in the first regulation period, taking the average mass flow of the new materials entering the crushing area in the first regulation period as the target total load flow of the first regulation period; In the second regulation period, taking an arithmetic average value of the average mass flow of the new materials entering the crushing area in the first regulation period and the average mass flow of the new materials entering the crushing area in the second regulation period as a target total load flow of the second regulation period; Starting from the third regulation period, when the sum of the average mass flow of the new materials entering the crushing area in the current regulation period, the average mass flow of the new materials entering the crushing area in the previous regulation period and the average mass flow of the new materials entering the crushing area in the previous two regulation periods is larger than zero, taking the arithmetic average value of the average mass flow of the new materials entering the crushing area in the current regulation period, the average mass flow of the new materials entering the crushing area in the previous regulation period and the average mass flow of the new materials entering the crushing area in the previous two regulation periods as the target total load flow of the current regulation period; From the third regulation period, dividing the stock mass of the buffer bin at the beginning of the current regulation period by the duration of the regulation period to form stock conversion average flow of the current regulation period when the sum of the average mass flow of the new material entering the crushing region in the current regulation period, the average mass flow of the new material entering the crushing region in the previous regulation period and the average mass flow of the new material entering the crushing region in the previous two regulation periods is equal to zero, comparing the stock conversion average flow of the current regulation period with the maximum reflux average mass flow, and taking the smaller value as the target total load flow of the current regulation period; comparing the target total load flow with the average mass flow of the new materials entering the crushing zone in the current regulation period, and taking the difference value of the target total load flow and the average mass flow of the new materials entering the crushing zone in the current regulation period as the theoretical reflux average mass flow when the target total load flow is larger than the average mass flow of the new materials entering the crushing zone in the current regulation period; dividing the theoretical reflowable average mass flow by the target total load flow when the target total load flow is greater than zero to form a trough depth of the current regulation period, and setting the trough depth of the current regulation period to be zero when the target total load flow is equal to zero.
5. The method for continuously pulverizing and sieving solid particles of Chinese medicine according to claim 4, wherein the step of obtaining the sieve surface load index and the reflux stopping threshold value according to the change relation of the state parameter relative to the no-load reference parameter comprises the following steps: Comparing the state differential pressure of the current regulating period with the idle reference differential pressure, dividing the difference value of the state differential pressure and the idle reference differential pressure by the two to form a first ratio, and counting according to zero when the first ratio is smaller than zero; Comparing the state amplitude of the current regulating period with the idle reference amplitude, dividing the difference value of the state amplitude and the idle reference amplitude by the two to form a second ratio, and counting according to zero when the second ratio is smaller than zero; Comparing the idle reference current with the state current of the current regulation period, dividing the difference value of the idle reference current and the state current of the current regulation period by the idle reference current to form a third ratio, and counting according to zero when the third ratio is smaller than zero; arithmetic average values are obtained for the first ratio, the second ratio and the third ratio to form a screen surface load index of the current adjusting period; Taking the trough depth of the current regulation period as a stop-return threshold value of the current regulation period; When the screen surface load index is greater than or equal to the backflow stopping threshold value, setting the current adjusting period as an adjusting period for not releasing the backflow of coarse particles on the screen; when the screen surface load index is less than the stop-flow threshold, the current adjustment period is set to an adjustment period that allows the actual return average mass flow to be obtained.
6. The method for continuously pulverizing and sieving solid particles of Chinese medicine according to claim 5, wherein the obtaining the actual reflux average mass flow according to the stop reflux threshold value, the buffer warehouse storage capacity and the maximum reflux average mass flow specifically comprises: when the screen surface load index of the current regulation period is greater than or equal to the backflow stopping threshold value, setting the actual backflow average mass flow of the current regulation period to be zero; When the screen load index of the current adjustment period is smaller than the stop-return threshold value: Dividing the stock quality of the buffer bin at the beginning of the current regulation period by the duration of the regulation period to form stock conversion average flow of the current regulation period; multiplying the theoretical reflowable average mass flow by a screen surface load index to form a theoretical reflowable average mass flow corrected by the screen surface load; Comparing the stock conversion average flow of the current regulation period, the theoretical reflux average mass flow corrected by the screen surface load and the maximum reflux average mass flow, and taking the minimum value as the actual reflux average mass flow of the current regulation period; Quantitatively opening a reflux door or a reflux feeder according to the actual reflux average mass flow of the current regulation period, and keeping coarse particles on the sieve to enter a crushing area according to the actual reflux average mass flow of the current regulation period in the current regulation period; When the average mass flow of the new material entering the crushing zone in the current regulation period is greater than or equal to the target total load flow, the theoretical reflux average mass flow is set to zero, and the actual reflux average mass flow in the current regulation period is set to zero.
7. The method according to claim 6, wherein the updating the buffer bin stock quality at the beginning of the next conditioning cycle is based on the accumulated mass of coarse particles on the screen entering the return branch and the actual return average mass flow, and comprises: when the current regulation period is finished, adding the accumulated mass of coarse particles on the screen entering the reflux branch in the current regulation period into the buffer warehouse mass at the beginning of the current regulation period; Multiplying the actual reflux average mass flow of the current regulation period by the duration of the regulation period when the current regulation period is finished, so as to form the released reflux mass in the current regulation period; subtracting the released reflux mass in the current regulation period from the sum of the accumulated mass of coarse particles on the sieve entering the reflux branch in the current regulation period and the stock mass of the buffer warehouse at the beginning of the current regulation period to form the stock mass of the buffer warehouse at the beginning of the next regulation period; acquiring the buffer warehouse storage quality at the beginning of the next regulation period to be greater than or equal to zero according to the fact that the actual backflow average mass flow of the current regulation period does not exceed the stock conversion average flow of the current regulation period; taking the stock quality of the buffer bin at the beginning of the next adjustment period as the initial stock quantity of the next adjustment period.
8. The continuous pulverizing and sieving method for solid particles of Chinese medicine according to claim 7, wherein said obtaining total load flow according to the average mass flow of fresh material entering the pulverizing zone and the average mass flow of actual reflux, and obtaining pulverizing rotation speed and pulverizing gap according to the deviation of total load flow from target total load flow, specifically comprises: adding the average mass flow of the new material entering the crushing zone in the current regulation period with the actual reflux average mass flow of the current regulation period to form the total load flow of the current regulation period entering the crushing zone; Dividing the difference value of the total load flow entering the crushing zone in the current regulation period by the sum of the total load flow entering the crushing zone in the current regulation period and the target total load flow when the sum of the total load flow entering the crushing zone in the current regulation period and the target total load flow is larger than zero to form the total load deviation value of the current regulation period; taking an arithmetic average value of the maximum crushing rotating speed and the minimum crushing rotating speed to form a crushing rotating speed central value; dividing the difference between the maximum crushing rotating speed and the minimum crushing rotating speed by two to form a crushing rotating speed regulating amplitude, multiplying the crushing rotating speed regulating amplitude by the total load deviation of the current regulating period, and subtracting the total load deviation from the central value of the crushing rotating speed to form the crushing rotating speed of the current regulating period; The method comprises the steps of obtaining an arithmetic average value of a maximum crushing gap and a minimum crushing gap to form a crushing gap central value, dividing the difference between the maximum crushing gap and the minimum crushing gap by two to form a crushing gap adjustment amplitude, multiplying the crushing gap adjustment amplitude by the total load deviation of the current adjustment period, and subtracting the total load deviation from the crushing gap central value to form the crushing gap of the current adjustment period.
9. The continuous pulverizing and sieving method for solid particles of Chinese medicinal materials according to claim 8, wherein the continuous pulverizing and sieving is performed according to the average mass flow rate of fresh material entering the pulverizing zone, the average mass flow rate of actual reflux, the pulverizing rotation speed and the pulverizing gap, the pass particles under the sieve are discharged, the coarse particles on the sieve are introduced into the buffer bin through the reflux branch, and the state parameters of the next adjustment period are updated, and the method specifically comprises: Continuously adding new materials according to the average mass flow of new materials entering a crushing zone in the current regulation period, uniformly releasing coarse particles on a screen in a buffer bin according to the actual average mass flow of backflow in the current regulation period, crushing the total load flow entering the crushing zone in the current regulation period according to the crushing rotating speed and the crushing gap in the current regulation period, continuously feeding crushed materials into a screen segment, directly discharging qualified particles under the screen, and guiding the coarse particles on the screen into the buffer bin through a backflow branch; Collecting motor current, differential pressure of preset measuring points at the upstream and downstream of the screening section and screen surface amplitude samples in a current regulation period, and recording the number of the samples collected in the current regulation period and the values of the samples; when the current regulation period is finished, recording the average mass flow of new materials entering the crushing zone in the current regulation period, the target total load flow, the screen surface load index, the actual reflux average mass flow, the stock quality of a buffer bin at the beginning of the next regulation period, the total load flow of the current regulation period entering the crushing zone, the crushing rotating speed of the current regulation period and the crushing gap of the current regulation period; Taking the stock quality of the buffer bin at the beginning of the next regulation period as the initial stock quantity of the next regulation period, and taking the arithmetic average value of all motor current samples, the arithmetic average value of all differential pressure samples and the arithmetic average value of all screen surface amplitude samples in the current regulation period as the state current of the next regulation period, the state differential pressure of the next regulation period and the state amplitude of the next regulation period respectively; When the addition of new materials to the crushing zone is stopped, the accumulated mass of the new materials entering the crushing zone in each subsequent adjustment period is set to zero, continuous crushing and screening are continuously carried out until one completed adjustment period exists, and the conditions that the accumulated mass of the new materials entering the crushing zone in the completed adjustment period is zero, the stock mass of a buffer bin at the beginning of the next adjustment period after the completion of the adjustment period is zero and the actual backflow average mass flow of the completed adjustment period is zero are simultaneously satisfied when the completed adjustment period is completed.

Description

Continuous crushing and screening method for traditional Chinese medicine solid particles Technical Field The invention relates to the technical field of process control, in particular to a continuous crushing and screening method for traditional Chinese medicine solid particles. Background In the preparation process of the formula granules, the granules and the intermediates, the solid traditional Chinese medicine granules generally need to be subjected to continuous or quasi-continuous crushing and screening treatment so as to ensure that the granule granularity meets the requirements of subsequent mixing, loading, dissolution or molding. In the prior art, it is common practice to employ a crushing apparatus and a sieving apparatus arranged in series and send coarse particles on the sieve back to the crushing section through a return channel, thereby forming a continuous crushing and sieving process. The technology can generally realize continuous turnover of materials, has the characteristics of larger treatment capacity, less manual intervention and the like, and is widely applied to the production scene of the solid preparation of the traditional Chinese medicine. However, in the prior art, in actual operation, the crushing and screening processes are usually organized in a fixed reflux mode or a rough linkage mode, namely, coarse particles on a screen flow back directly once generated, or the feeding amount, crushing strength and screening state are simply adjusted only according to a single parameter, and the refining coordination of the relation among new material fluctuation, reflux beat, screen surface bearing state and buffer inventory is lacking. Especially when periodical fluctuation exists in upstream granulation or pre-crushing discharging, if coarse particle backflow and a new material peak are overlapped in the same period, instantaneous load of a crushing section is easily increased, and further partial pressure difference of a screening section is increased, vibration state of a screen surface is changed, and coarse particle circulation quantity is increased, so that continuous operation stability is not facilitated. In addition, in the prior art, the processing of the reflux particles often lacks a transition buffering and beat distribution mechanism, the relation between the reflux quantity of coarse particles and the stock of a buffering warehouse is not clear, and the utilization of the bearing allowance of the screening section is insufficient. In the end section emptying stage, if conventional average reflow or fixed reflow logic is still used, the problem of insufficient release of residual coarse particles in the surge bin and low emptying efficiency can also occur. On the other hand, in the prior art, setting of execution parameters such as a crushing rotating speed, a crushing gap and the like is often independent of total load change, and coordination adjustment is difficult to be carried out according to total load formed by new materials and backflow together, so that the problems of large load fluctuation, unsmooth process connection, insufficient operation stability and the like in the continuous crushing and screening process are easily caused. Therefore, the scheme aims to provide a continuous crushing and screening method for traditional Chinese medicine solid particles, on the premise of not interrupting continuous production, new materials entering a crushing area, coarse particles on a screen flow back and a buffer warehouse are regarded as three key nodes of the same material flow network, no-load reference is introduced to perform normalization comparison on sensing signals, a screen surface load representation and a back stopping threshold value are formed by using multi-source state parameters, self-adaptive control of back flow 'putting or stopping and putting quantity' is realized, and meanwhile, the crushing rotating speed and the crushing gap are adjusted in a linkage mode according to the deviation of total load and target total load, so that two crushing and screening sections cooperatively and stably operate in the same beat. Disclosure of Invention The present invention provides a continuous pulverizing and sieving method for solid particles of Chinese medicinal materials, which facilitates solving the problems mentioned in the background art. The invention provides a continuous crushing and screening method for traditional Chinese medicine solid particles, which comprises the following steps: Dividing adjacent adjusting periods by the average passing time from the crushing inlet to stable outflow of qualified particles under the screen, and collecting the accumulated mass of new materials entering the crushing area in the current adjusting period, the accumulated mass of coarse particles on the screen entering the reflux branch and the buffer warehouse storage mass at the beginning of the current adjusting period; Collecting motor current, preset measurin