CN110639223B - Automatic control system for liquid level and stirring rotation speed of crystallization kettle - Google Patents
Automatic control system for liquid level and stirring rotation speed of crystallization kettle Download PDFInfo
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- CN110639223B CN110639223B CN201910941900.9A CN201910941900A CN110639223B CN 110639223 B CN110639223 B CN 110639223B CN 201910941900 A CN201910941900 A CN 201910941900A CN 110639223 B CN110639223 B CN 110639223B
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- B01D9/0063—Control or regulation
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Abstract
The invention provides a crystallization kettle liquid level and stirring rotation speed automatic control system, which is characterized in that: the device comprises a crystallization unit, a frequency conversion unit and a central control unit; the crystallization unit comprises a crystallization kettle and a liquid level meter; the liquid level meter measures the liquid level height in the crystallization kettle in real time/at regular time and transmits the measurement result to the central control unit; the crystallization kettle is provided with a stirring device; the frequency conversion unit is electrically connected with the stirring device and used for regulating and controlling the rotating speed of the stirring device; and the central control unit controls the frequency conversion unit to adjust the rotating speed of the stirring device according to the change condition of the liquid level in the crystallization kettle. The equipment can realize crystallization kettle equipment for automatically controlling the stirring speed, thereby realizing the stable control of the product quality and the crystal form and continuous production.
Description
Technical Field
The invention relates to the field of crystallization equipment, in particular to an automatic control system for the liquid level and the stirring speed of a crystallization kettle.
Background
In the process of medicine crystallization, the stirring liquid level in the crystallization tank is continuously raised along with the dropping of the crystallization solvent. In order to ensure that the upper and lower layers of liquid in the kettle are uniformly stirred and simultaneously the growth of crystal form is controlled, the stirring speed is increased linearly.
The operation technology is judged and controlled by operators according to own experience and stronger observation capability, and the operation has the problem of larger deviation between the operations of the same or different operators, so that the control on the product quality and the stability of the crystal form are not facilitated, and the process has great instability.
Disclosure of Invention
Aiming at the problems, the invention provides crystallization kettle equipment capable of automatically controlling the stirring speed, so that the stable control and continuous production of the product quality and the crystal form are realized.
The invention provides a crystallization kettle liquid level and stirring rotation speed automatic control system, which is characterized in that: comprises a crystallization unit, a frequency conversion unit, a solvent unit and a central control unit;
wherein, the crystallization unit comprises a crystallization kettle and a liquid level meter;
the liquid level meter measures the liquid level height in the crystallization kettle in real time/at regular time and transmits the measurement result to the central control unit;
the crystallization kettle is provided with a stirring device;
the frequency conversion unit is electrically connected with the stirring device and used for regulating and controlling the rotating speed of the stirring device;
the solvent unit is used for conveying a solvent into the crystallization kettle;
the central control unit controls the frequency conversion unit to adjust the rotating speed of the stirring device according to the change condition of the liquid level in the crystallization kettle.
Further, the invention provides an automatic control system for the liquid level and the stirring speed of a crystallization kettle, which is characterized in that: according to the specified frequency and the specified time period, the frequency conversion unit linearly adjusts the rotating speed of the stirring device according to the liquid level change condition in the crystallization kettle.
Further, the invention provides an automatic control system for the liquid level and the stirring speed of a crystallization kettle, which is characterized in that: the central control unit comprises an analysis module, a judgment module and a control module;
the analysis module analyzes the change condition of the liquid level in the appointed time period;
the judging module judges whether the stirring speed needs to be adjusted or not according to the change condition of the liquid level;
and the control module adjusts the stirring speed according to the judgment result.
Further, the invention provides an automatic control system for the liquid level and the stirring speed of a crystallization kettle, which is characterized in that: the working method of the central control unit is as follows:
s1, acquiring initial liquid level data L0 of stirring equipment in a starting state;
s2, acquiring liquid level data LN at the Nth time point one by one;
s3, analyzing the difference N between the liquid level data LN and the initial liquid level data L0 one by one;
s4, judging whether the difference value N is larger than or equal to a threshold value I one by one,
when the difference N is smaller than the threshold I, S2 is repeated;
when the difference is greater than or equal to the threshold I, S5 is performed;
s5, regulating and controlling the stirring speed to adjust the speed (such as speed increasing or speed reducing) according to a set adjusting scheme;
wherein, the N is a natural number;
the above initial liquid level data L0:
when no solvent is added, the initial liquid level data L0 is the initial liquid level data;
after the solvent was added and the stirring speed was adjusted, the initial liquid level data L0 was the instantaneous liquid level data after the adjustment of the stirring speed.
The method is to judge whether to increase the stirring speed according to the total change of the liquid level in the reaction kettle.
Further, the invention provides an automatic control system for the liquid level and the stirring speed of a crystallization kettle, which is characterized in that: the liquid level is a plurality of liquid levels which are uniformly distributed on the same plane of the crystallizing tank.
When the liquid level meter is plural, the liquid level height may be a measured average value of the plural liquid level meters.
Further, the invention provides an automatic control system for the liquid level and the stirring speed of a crystallization kettle, which is characterized in that: the working method of the central control unit is as follows:
s1, acquiring liquid level data of all liquid level meters in the Nth time;
s2, analyzing all the liquid level meter data in the Nth time to obtain the highest liquid level NmaxAnd the lowest liquid level Nmin；
S3, analyzing the maximum liquid level NmaxAnd the lowest liquid level NminThe difference between;
s4, judging whether the difference is smaller than a threshold value II,
when the difference is smaller than the threshold II, S5 is performed;
when the difference is greater than or equal to the threshold II, S1 is repeated;
s5, regulating and controlling the stirring speed to adjust the speed according to a set adjustment scheme;
the above N is a natural number.
The method is to judge whether to accelerate the stirring according to the instant change of the liquid level in the reaction kettle.
Further, the invention provides an automatic control system for the liquid level and the stirring speed of a crystallization kettle, which is characterized in that: the solvent unit comprises a solvent storage tank and a flowmeter;
the flowmeter is arranged on a channel for conveying the solvent from the solvent storage tank to the crystallization kettle;
the flowmeter is electrically connected with the central control unit and transmits flow data to the central control unit at regular time or in real time.
Further, the invention provides an automatic control system for the liquid level and the stirring speed of a crystallization kettle, which is characterized in that: the central control unit comprises an analysis module, a judgment module and a control module;
the analysis module analyzes the change condition of the liquid level in the specified time period and the addition amount of the solvent in the specified time period;
the judgment module judges whether the addition amount of the solvent reaches a threshold value III or not according to the addition amount of the solvent, and judges that the stirring speed needs to be adjusted when the addition amount of the solvent reaches the threshold value III;
and the control module adjusts the stirring speed according to the judgment result.
In the above method, whether or not the agitation is accelerated is determined according to the amount of the solvent added, that is, the linear acceleration is performed after a certain amount of the solvent is added.
Further, the invention provides an automatic control system for the liquid level and the stirring speed of a crystallization kettle, which is characterized in that: the central control unit also comprises a rechecking module;
when the stirring speed changes for the Mth time, the rechecking module rechecks the correctness of the current stirring speed;
m is a natural number.
Further, the invention provides an automatic control system for the liquid level and the stirring speed of a crystallization kettle, which is characterized in that: the specific rechecking method comprises the following steps:
s1, acquiring instant liquid level data of a plurality of liquid level meters after the Mth change of the stirring speed;
s2, analyzing all the liquid level meter data in the Nth time to obtain the highest liquid level NmaxAnd the lowest liquid level Nmin；
S3, analyzing the maximum liquid level NmaxAnd the lowest liquid level NminThe difference between them;
s4, judging whether the difference value is larger than, equal to or smaller than a threshold value IV;
when the difference value is smaller than the threshold value IV, instructing the stirring equipment to increase the speed again;
when the difference value is equal to the threshold value IV, continuing to stir at the current speed;
when the difference is greater than the threshold IV, the stirring device is instructed to slow down.
The invention has the following functions and effects:
the invention adopts the central control unit to monitor the change condition in the crystallization kettle and judge the change condition, thereby controlling the stirring speed and realizing the automatic adjustment process.
Drawings
FIG. 1 is a schematic diagram of an automatic control system for the solvent rotation speed of a crystallization kettle according to the present embodiment.
Detailed Description
As shown in fig. 1, the present embodiment provides an automatic control system for liquid level and stirring speed of a crystallization kettle, which comprises a crystallization unit, a frequency conversion unit, a solvent unit and a PLC central control unit;
the crystallization unit comprises a crystallization tank with stirring equipment and an explosion-proof ultrasonic liquid level meter;
the explosion-proof ultrasonic liquid level meter is arranged on a crystallization tank, measures the liquid level height in the crystallization tank in real time/timing mode, and transmits the measurement result to a central control unit; the height of the liquid level can be the liquid level height of the current measurement time point, a certain change value of the liquid level can be generated under the stirring state, the height of the liquid level can also be the average height of all liquid level heights in N milliseconds (N can be adjusted according to the stirring degree) before and after the current measurement time point, or a plurality of N explosion-proof ultrasonic liquid level meter liquid level meters with the same type and the same sensitivity can be arranged on the same horizontal height of the crystallizing tank, and the height of the liquid level can also be the average of the measurement results of the N explosion-proof ultrasonic liquid level meter liquid level meters at the current measurement time point.
The frequency conversion unit comprises a frequency converter, is electrically connected with the stirring device and regulates and controls the rotating speed of the stirring device;
the solvent unit comprises a solvent storage tank and a flowmeter;
the flowmeter is arranged on a solvent conveying passage for conveying a solvent from a solvent storage tank to a crystallization tank and is used for measuring and monitoring the liquid flow and the flow speed on the current passage;
the PLC central control unit is a PLC control box and controls the frequency conversion unit to adjust the rotating speed of the stirring device according to the change condition of the liquid level in the crystallization kettle.
The PLC control box is respectively and electrically connected with an explosion-proof ultrasonic liquid level meter and a frequency converter.
According to the above-mentioned device, in this embodiment, multiple monitoring modes can be adopted to implement
Test examples I,
The central control unit of the PLC comprises an analysis module, a judgment module and a control module;
the analysis module analyzes the change condition of the liquid level in the appointed time period;
the judging module judges whether the stirring speed needs to be adjusted or not according to the change condition of the liquid level;
the control module adjusts the stirring speed according to the judgment result.
According to the automatic control system for the stirring speed of the crystallization kettle, a new round of judgment process is started after the stirring speed is increased every time according to the appointed frequency (the appointed frequency refers to the fact that whether the liquid level changes once after a certain time, for example, whether the liquid level reaches the standard and increases the speed is judged once every 2 min) in the appointed time period, the liquid level increase amount after the speed increase is monitored and judged every appointed time period, and when the increase amount of the liquid level in the crystallization kettle reaches the set value, the frequency conversion unit is controlled to adjust the rotating speed of the stirring device, so that the speed increase is achieved.
The specific working method is as follows:
s1, acquiring initial liquid level data L0 of stirring equipment in a starting state;
s2, acquiring liquid level data LN at the Nth time point one by one;
s3, analyzing the difference N between the liquid level data LN and the initial liquid level data L0 one by one;
s4, judging whether the difference value N is larger than or equal to a threshold value I one by one,
when the difference N is smaller than the threshold I, S2 is repeated;
when the difference is greater than or equal to the threshold I, S5 is performed;
s5, regulating and controlling the stirring speed to accelerate the stirring speed according to a set accelerating speed;
wherein, the N is a natural number;
the initial liquid level data L0 is when no solvent is added, and the initial liquid level data L0 is initial liquid level data; after the addition of the solvent and the adjustment of the stirring speed, the initial liquid level data L0 is the instant liquid level data after the adjustment of the stirring speed.
Take a specific scenario as an example:
after the crystallization system was set to start stirring at the set initial speed, the liquid level change was measured every 1 min.
S1, acquiring liquid level data at 0 min;
s2, analyzing a liquid level difference value 1 (namely, a difference value of two liquid levels) between the liquid level (because the liquid level meter measures the liquid level in real time and the data can be called for use at any time) at the 0min (namely, when no new solvent is added after stirring is started) and the liquid level (because the liquid level meter measures the liquid level in real time and the data can be called for use at any time) at the 1 min;
s3, judging whether the difference value 1 is larger than or equal to a threshold value I (for example, is set to be 2 cm);
when the difference 1 is smaller than 2cm, performing S4;
when the difference is greater than or equal to 2cm, the current stirring speed is increased by 1%;
s4, analyzing a difference value 2 between the liquid level at the time of 2min and the liquid level at the time of 0 min;
s3, judging whether the difference value 2 is larger than or equal to 2 cm;
when the difference 2 is less than 2cm, performing S5, wherein S5 is similar to S2 or S4, and comparing the liquid differences one by one until the difference between the liquid level at the Nth minute and 0min is found to reach 2 cm;
and when the difference value 2 is greater than or equal to 2cm, improving the current stirring speed by 1%.
In the first acceleration judging process, after the acceleration is carried out, the initial liquid level which is continuously judged by next acceleration is 0min, namely the instant liquid level height after the acceleration stirring.
Test examples II,
The liquid level meter is multiple, and the average height of the liquid level is not taken as the liquid level height of the specified time point.
The central control unit of the PLC comprises an analysis module, a judgment module and a control module;
the analysis module analyzes the change condition of the liquid level in the appointed time period;
the judging module judges whether the stirring speed needs to be adjusted or not according to the change condition of the liquid level;
the control module adjusts the stirring speed according to the judgment result.
According to the automatic control system for the stirring speed of the crystallization kettle, a new round of judgment process is started after the stirring speed is increased every time according to the appointed frequency (the appointed frequency refers to that the judgment process is started every time), in the appointed time period (the appointed time period refers to that the judgment is performed once every certain time, for example, every 2 min), a monitoring and judgment are performed on the difference value of the highest liquid level and the lowest liquid level in the stirring state after acceleration is performed every appointed time period, and when the difference value of the liquid level in the crystallization kettle is flat and slow, the liquid in the kettle is too much, the effect of completely mixing the liquid at the current stirring speed cannot be achieved, and the speed is required to be increased.
The specific working method is as follows:
s1, acquiring liquid level data of all liquid level meters in the Nth time;
s2, analyzing all the liquid level meter data in the Nth time to obtain a highest liquid level Nmax and a lowest liquid level Nmin;
s3, analyzing the difference between the highest liquid level Nmax and the lowest liquid level Nmin;
s4, judging whether the difference is smaller than a threshold value II,
when the difference is smaller than the threshold II, S5 is performed;
when the difference is greater than or equal to the threshold II, S1 is repeated;
s5, regulating and controlling the stirring speed to accelerate the stirring speed according to a set accelerating speed;
n is a natural number.
Take a specific scenario as an example:
when the crystallization system is set to be accelerated once, the liquid level change condition is measured every 1 min.
S1, acquiring liquid level data of all liquid level meters at 1 min;
s2, analyzing all the liquid level meter data at 1min to obtain the highest liquid level value Nmax and the lowest liquid level value Nmin;
s3, analyzing the difference between the highest liquid level Nmax and the lowest liquid level Nmin;
s4, judging whether the difference is smaller than a threshold value II (which can be set to be 0.5cm),
when the difference is less than 0.5cm, performing S5;
when the difference is greater than or equal to 0.5cm, repeating S1 to obtain the liquid level at the next 1 min;
and S5, regulating and controlling the stirring speed to accelerate the stirring speed according to the set lifting speed.
Test example III,
The central control unit comprises an analysis module, a judgment module and a control module;
the analysis module analyzes the change condition of the liquid level in the specified time period and analyzes the addition amount of the menstruum in the specified time period;
the judging module judges whether the adding amount of the solvent reaches a threshold value III (the threshold value III can be set in a self-defined way, for example, the threshold value III is set to be 50ml, namely, the speed is increased once every 50ml is added), and when the adding amount of the solvent reaches the threshold value III, the stirring speed needs to be adjusted;
the control module adjusts the stirring speed according to the judgment result.
According to the system for automatically controlling the stirring speed of the crystallization kettle, provided by the embodiment, in a specified time period (the specified time period refers to the judgment of the variation of the total addition amount once after a certain time, for example, every 2 min), accounting is performed on the total addition amount after acceleration is performed according to a specified frequency (the specified frequency refers to the judgment process that a new round is started after the stirring speed is increased every time), and after a certain amount is added (for example, after the speed is increased, 50ml of solvent is added), the speed needs to be increased.
Consider the case of a false speed-up that is possible with each of the above methods.
When the stirring speed changes for the Mth time, the rechecking module rechecks the correctness of the current stirring speed; m is a natural number. The rechecking scheme needs to assist in judgment by adopting multiple liquid level meters.
The specific rechecking method comprises the following steps:
s1, acquiring instant liquid level data of a plurality of liquid level meters after the Mth change of the stirring speed;
s2, analyzing all the liquid level meter data in the Nth time to obtain a highest liquid level Nmax and a lowest liquid level Nmin;
s3, analyzing a difference value between the highest liquid level Nmax and the lowest liquid level Nmin;
s4, judging whether the difference value is larger than, equal to or smaller than a threshold value IV; (e.g.: set to 2cm)
When the difference is less than 2cm, then can think the speed governing of last time can not reach the stirring effect, need instruct agitated vessel to increase speed once more, the process of this instruction can be for directly promoting certain volume, if: 0.5%, or may be determined again by repeating the above determination process with the current as a starting point;
when the difference value is equal to the threshold value of 2cm, the current stirring speed can be determined to accord with the stirring effect, and the stirring is continued at the current speed;
when the difference is greater than 2cm, it is determined that the current stirring speed is too fast, the stirring device should be instructed to decelerate, and the process of the instruction may be directly decreasing by a certain amount, such as: 0.5%, or the acceleration process may be determined again in order to return to the last stirring speed.
This embodiment is through installing an explosion-proof type ultrasonic wave level gauge on the crystallization kettle, through the height of scanning monitoring crystallization kettle interior liquid level. The collected data are input into the PLC control system, the instructions are output to the frequency converter according to the control program of the experience number, the rotating speed of the crystallizing tank stirring motor system is controlled according to the preset rotating speed, and meanwhile, the crystallizing tank stirring paddle is in an S-shaped design, so that the crystallizing control is facilitated. The system can be used for stably and efficiently continuously producing, stably controlling the quality of products and greatly reducing the deviation caused by manual operation.
Claims (8)
1. The utility model provides a crystallization kettle liquid level and stirring rotational speed automatic control system which characterized in that: comprises a crystallization unit, a frequency conversion unit, a solvent unit and a central control unit;
the crystallization unit comprises a crystallization kettle and a liquid level meter;
the liquid level meter measures the liquid level height in the crystallization kettle in real time/at regular time and transmits the measurement result to the central control unit;
the crystallization kettle is provided with a stirring device;
the frequency conversion unit is electrically connected with the stirring device and used for regulating and controlling the rotating speed of the stirring device;
the solvent unit is used for conveying a solvent into the crystallization kettle;
the central control unit controls the frequency conversion unit to adjust the rotating speed of the stirring device according to the change condition of the liquid level in the crystallization kettle;
the central control unit comprises an analysis module, a judgment module and a control module;
the analysis module analyzes the change condition of the liquid level in the specified time period;
the judging module judges whether the stirring speed needs to be adjusted or not according to the change condition of the liquid level;
the control module adjusts the stirring speed according to the judgment result;
the working method of the central control unit is as follows:
s1, acquiring initial liquid level data L0 of stirring equipment in a starting state;
s2, acquiring liquid level data LN at the Nth time point one by one;
s3, analyzing the difference value Q between the liquid level data LN and the initial liquid level data L0 one by one;
s4, judging whether the difference value Q is larger than or equal to a threshold value I one by one,
when the difference Q is smaller than the threshold I, S2 is repeated;
when the difference Q is greater than or equal to the threshold I, S5 is performed;
s5, regulating and controlling the stirring speed to adjust the speed according to a set adjustment scheme;
wherein, the N is a natural number;
the initial liquid level data L0:
when no solvent is added, the initial liquid level data L0 is initial liquid level data;
after the solvent is added and the stirring speed is adjusted, the initial liquid level data L0 is the instant liquid level data after the stirring speed is adjusted.
2. The crystallization kettle liquid level and stirring rotation speed automatic control system as claimed in claim 1, wherein: according to the specified frequency and the specified time period, the frequency conversion unit linearly adjusts the rotating speed of the stirring device according to the liquid level change condition in the crystallization kettle.
3. The crystallization kettle liquid level and stirring rotation speed automatic control system as claimed in claim 1, wherein: the liquid level meter is a plurality of and is uniformly distributed on the same plane of the crystallizing tank.
4. The crystallization kettle liquid level and stirring rotation speed automatic control system as claimed in claim 3, wherein: the working method of the central control unit is as follows:
s1, acquiring liquid level data of all liquid level meters in the Nth time;
s2, analyzing all the liquid level meter data in the Nth time to obtain the highest liquid level LmaxAnd the lowest liquid level Lmin；
S3, analyzing the highest liquid level LmaxAnd the lowest liquid level LminThe difference between;
s4, judging whether the difference is smaller than a threshold value II,
when the difference is smaller than the threshold II, S5 is performed;
when the difference is greater than or equal to the threshold II, S1 is repeated;
s5, regulating and controlling the stirring speed to adjust the speed according to a set adjustment scheme;
and N is a natural number.
5. The crystallization kettle liquid level and stirring rotation speed automatic control system as claimed in claim 1, wherein:
the solvent unit comprises a solvent storage tank and a flowmeter;
the flowmeter is arranged on a passage for conveying the solvent from the solvent storage tank to the crystallization kettle;
the flowmeter is electrically connected with the central control unit and transmits flow data to the central control unit at regular time or in real time.
6. The crystallization kettle liquid level and stirring rotation speed automatic control system as claimed in claim 5, wherein:
the central control unit comprises an analysis module, a judgment module and a control module;
the analysis module analyzes the change condition of the liquid level in the specified time period and analyzes the addition amount of the menstruum in the specified time period;
the judgment module judges whether the addition amount of the solvent reaches a threshold III or not according to the addition amount of the solvent, and judges that the stirring speed needs to be adjusted when the addition amount of the solvent reaches the threshold III;
and the control module adjusts the stirring speed according to the judgment result.
7. The system for automatically controlling the liquid level and the stirring speed of the crystallization kettle according to any one of claims 1 to 6, wherein:
the central control unit also comprises a rechecking module;
when the stirring speed changes for the Mth time, the rechecking module rechecks the correctness of the current stirring speed;
and M is a natural number.
8. The crystallization kettle liquid level and stirring rotation speed automatic control system as claimed in claim 7, wherein the specific rechecking method is as follows:
s1, acquiring instant liquid level data of a plurality of liquid level meters after the Mth change of the stirring speed;
s2, analyzing all the liquid level meter data in the Nth time to obtain the highest liquid level LmaxAnd the lowest liquid level Lmin；
S3, analyzing the highest liquid level LmaxAnd the lowest liquid level LminThe difference between them;
s4, judging whether the difference value is larger than, equal to or smaller than a threshold value IV;
when the difference value is smaller than the threshold value IV, instructing the stirring equipment to increase the speed again;
when the difference value is equal to the threshold value IV, continuing to stir at the current speed;
when the difference is greater than the threshold IV, the stirring device is instructed to slow down.
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