CN110946311A - Quality control method and system for charging cut stems - Google Patents
Quality control method and system for charging cut stems Download PDFInfo
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- CN110946311A CN110946311A CN201911272817.3A CN201911272817A CN110946311A CN 110946311 A CN110946311 A CN 110946311A CN 201911272817 A CN201911272817 A CN 201911272817A CN 110946311 A CN110946311 A CN 110946311A
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- 238000003908 quality control method Methods 0.000 title claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 89
- 239000007788 liquid Substances 0.000 claims abstract description 56
- 238000000034 method Methods 0.000 claims abstract description 48
- 230000008569 process Effects 0.000 claims abstract description 39
- 238000002347 injection Methods 0.000 claims abstract description 28
- 239000007924 injection Substances 0.000 claims abstract description 28
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- 239000000463 material Substances 0.000 abstract description 3
- 230000006870 function Effects 0.000 description 9
- 241000208125 Nicotiana Species 0.000 description 7
- 235000002637 Nicotiana tabacum Nutrition 0.000 description 7
- 238000005507 spraying Methods 0.000 description 6
- 230000009471 action Effects 0.000 description 2
- 235000019504 cigarettes Nutrition 0.000 description 2
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B3/00—Preparing tobacco in the factory
- A24B3/12—Steaming, curing, or flavouring tobacco
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- A—HUMAN NECESSITIES
- A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
- A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
- A24B9/00—Control of the moisture content of tobacco products, e.g. cigars, cigarettes, pipe tobacco
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G05D23/19—Control of temperature characterised by the use of electric means
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Abstract
The invention provides a quality control method and a system for charging cut stems, wherein the method comprises the following steps: setting a feed liquid ratio according to a set value, and acquiring a hot air temperature target value and an outlet water content target value corresponding to the cut stems; establishing a temperature feedback control model of the hot air temperature and the opening of a steam valve, and controlling the opening of the steam valve according to the temperature feedback control model and the target value of the hot air temperature so as to control the hot air temperature in the charging machine; acquiring a measured value of the outlet water content of the cut stem feeding process, and acquiring a target deviation value of the outlet water content according to the target value and the measured value; and establishing a water content PID feedback control model for regulating the feed liquid injection amount according to the target deviation value so as to perform feedback control on the outlet water content, so that the outlet water content of the cut stem feeding process of each batch is controlled according to the target value. The method can improve the accuracy of the ratio of the material liquid for feeding the cut stems and the stability of the water content of the outlet, and improve the quality control capability in the production process.
Description
Technical Field
The invention relates to the technical field of tobacco processing, in particular to a quality control method and system for cut stem charging.
Background
The stem shred feeding is an important technological process in the production and processing process of tobacco, feed liquid is applied to the stem shreds according to the formula requirement, and the irritation and the miscellaneous gas of the tobacco are reduced and the sensory quality and the physical characteristics of the tobacco are improved through the feeding process. The existing stem feeding control is to apply feed liquid to the stems by a feeding system according to the flow rate and the feeding proportion of the stems in the production process. Meanwhile, the feed liquid is mixed with steam and sprayed through a nozzle, so that the different proportions of the feed liquid and the feed liquid applied when different brands of cigarettes are produced need to be considered in the water control and the temperature control, and the stability of the water content of the process outlet and the temperature of hot air is realized. The accuracy and the uniformity of the feed liquid directly influence the quality of the tobacco, and have great influence on the smoking taste of the cigarette. The existing feed liquid control is usually diagnosed according to the experience of a client and takes an adjusting measure, the judging mode is greatly influenced by subjective factors (experience and skill) of the client, and the problems of insufficient scientificity and even misjudgment exist, so that the regulation and control of feeding of various batches of cut stems are not facilitated, and the long-term stability is realized.
Disclosure of Invention
The invention provides a quality control method and a quality control system for stem shred feeding, which solve the problem of inaccurate control of the spraying proportion and the uniformity of feed liquid during stem shred feeding in the prior art, can improve the accuracy of the feed liquid proportion of each brand of stem shred feeding and the stability of water at a process outlet, and improve the quality control capability in the production process.
In order to achieve the above purpose, the invention provides the following technical scheme:
a quality control method for charging cut stems comprises the following steps:
setting a feed liquid ratio according to a set value, and acquiring a hot air temperature target value and an outlet water content target value corresponding to the cut stem feeding;
establishing a temperature feedback control model of the hot air temperature and the opening of a steam valve, and controlling the opening of the steam valve according to the temperature feedback control model and the target value of the hot air temperature so as to control the hot air temperature in the charging machine;
acquiring a measured value of the outlet water content of the cut stem feeding process, and acquiring a target deviation value of the outlet water content according to the target value of the outlet water content and the measured value;
and establishing a water content PID feedback control model for regulating the feed liquid injection amount according to the target deviation value so as to perform feedback control on the outlet water content, so that the outlet water content of the cut stem feeding process of each batch is controlled according to the target value.
Preferably, the method further comprises the following steps:
acquiring outlet water content and feed liquid injection amount in a cut stem feeding process within set time in real time, and fitting according to a time relation to obtain a regression fitting function of the outlet water content and the feed liquid injection amount;
and determining the value range of the PID parameters according to the regression fitting function, so that the water content PID feedback control model performs PID parameter adjustment according to the value range in the cut stem feeding process in the same batch.
Preferably, the method further comprises the following steps:
collecting a value sample of the water content of the outlet of each batch, and calculating the mean square error of each batch after each batch is finished;
and if the mean square errors of two continuous batches are continuously increased, adjusting the PID parameters in the water content PID feedback control model.
Preferably, the temperature feedback control model for establishing the hot air temperature and the steam valve opening degree comprises:
the temperature feedback control model divides the actual value of the hot air temperature into N intervals by taking the target value of the hot air temperature as the center, determines the steam valve openings corresponding to different intervals, and controls the steam valve openings to reach corresponding values according to the interval where the actual value of the hot air temperature is located so as to realize the control of the hot air temperature.
Preferably, the temperature feedback control model for establishing the hot air temperature and the steam valve opening further includes:
acquiring a measured value of the hot air temperature, and calculating to obtain a temperature difference value according to the target value of the hot air temperature;
and establishing a temperature PID feedback control model, and adjusting the opening of a steam valve according to the temperature difference value so as to control the temperature of hot air.
The invention also provides a quality control system for charging cut stems, which comprises:
the first acquisition unit is used for setting a feed liquid proportion according to a set value and acquiring a hot air temperature target value and an outlet water content target value corresponding to the stem shred feeding;
the temperature control unit is used for establishing a temperature feedback control model of the temperature of the hot air and the opening of the steam valve, and controlling the opening of the steam valve according to the temperature feedback control model and the target value of the temperature of the hot air so as to control the temperature of the hot air in the charging machine;
the second acquisition unit is used for acquiring an actual measurement value of the outlet water content of the cut stem feeding process and acquiring a target deviation value of the outlet water content according to the target value of the outlet water content and the actual measurement value;
and the moisture content control unit is used for establishing a moisture content PID feedback control model and is used for adjusting the feed liquid injection amount according to the target deviation value so as to perform feedback control on the moisture content of the outlet, so that the moisture content of the outlet of each batch of cut stem feeding process is controlled according to the target value.
Preferably, the method further comprises the following steps:
the fitting unit is used for acquiring the outlet water content and the feed liquid injection amount in the cut stem feeding process within set time in real time, and fitting according to a time relation to obtain a regression fitting function of the outlet water content and the feed liquid injection amount;
and the first PID parameter adjusting unit is used for determining the value range of the PID parameters according to the regression fitting function, so that the moisture content PID feedback control model can carry out PID parameter adjustment according to the value range in the cut stem feeding process in the same batch.
Preferably, the method further comprises the following steps:
the error calculation unit is used for acquiring the value sample of the water content of the outlet of each batch and calculating the mean square error of each batch after each batch is finished;
and the second PID parameter adjusting unit is used for adjusting the PID parameters in the water content PID feedback control model when the mean square errors of two continuous batches are continuously increased.
Preferably, the temperature control unit includes:
and the temperature partition control module is used for dividing the actual value of the hot air temperature into N intervals by taking the target value of the hot air temperature as a center, determining the opening of the steam valve corresponding to different intervals, and controlling the opening of the steam valve to reach a corresponding value according to the interval where the actual value of the hot air temperature is located so as to realize the control of the hot air temperature.
Preferably, the temperature control unit further includes:
the temperature PID control module is used for acquiring a hot air temperature measured value and calculating a temperature difference value according to the hot air temperature target value; and establishing a temperature PID feedback control model, and adjusting the opening of a steam valve according to the temperature difference value so as to control the temperature of hot air.
The invention provides a quality control method and a quality control system for stem shred feeding, which are used for controlling the hot air temperature and the outlet moisture content by respectively adjusting the opening of a steam valve and the injection quantity of a feed liquid through setting a PID (proportion integration differentiation) feedback control model for controlling the inlet moisture content and the outlet moisture content of a temperature feedback control module, solving the problem that the control on the spraying proportion and the uniformity of the feed liquid is inaccurate when the stem shred is fed, improving the accuracy of the feed liquid proportion of the stem shred feeding of each brand and the stability of the process outlet moisture, and improving the quality control capability of the production process.
Drawings
In order to more clearly describe the specific embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below.
Fig. 1 and fig. 2 are schematic diagrams of a quality control method for charging cut rolled stems provided by the invention.
Detailed Description
In order to make the technical field of the invention better understand the scheme of the embodiment of the invention, the embodiment of the invention is further described in detail with reference to the drawings and the implementation mode.
Aiming at the problems that the ratio and the uniformity of material liquid spraying in the current stem shred feeding process are not accurate, the quality of tobacco leaves in batches or between batches is not consistent, and the quality of tobacco is affected, the invention provides a stem shred feeding quality control method and a stem shred feeding quality control system.
As shown in fig. 1, a quality control method for charging cut rolled stems comprises the following steps:
s1: setting a feed liquid ratio according to a set value, and acquiring a hot air temperature target value and an outlet water content target value corresponding to the cut stem feeding;
s2: establishing a temperature feedback control model of the hot air temperature and the opening of a steam valve, and controlling the opening of the steam valve according to the temperature feedback control model and the target value of the hot air temperature so as to control the hot air temperature in the charging machine;
s3: and acquiring a measured value of the outlet water content of the cut stem feeding process, and acquiring a target deviation value of the outlet water content according to the target value of the outlet water content and the measured value.
S4: and establishing a water content PID feedback control model for regulating the feed liquid injection amount according to the target deviation value so as to perform feedback control on the outlet water content, so that the outlet water content of the cut stem feeding process of each batch is controlled according to the target value.
Specifically, the cut stems are conveyed into a roller of the feeder by a vibrating conveyor, and the roller is driven by a transmission device to rotate, so that the cut stems automatically flow towards a discharge port. When the cut stems run, the feed liquid is sprayed to the cut stems through the pipeline. Under the action of steam pressure, the material liquid and the steam are mixed and sprayed in a mist shape to the blades. In the production process of the blade feeding process, the moisture content of the outlet can be influenced and controlled through the aspects of hot air temperature, circulating air quantity, feed liquid steam jet quantity and the like. In order to avoid instability of the production process caused by simultaneous action of a plurality of influence factors, a plurality of influence variables can be respectively fixed at a proper value, and only one influence factor is adjusted to control the water content of the outlet. According to the method, the opening of the steam valve is gated to control the temperature of hot air, and the water content of the outlet is adjusted by adjusting the injection amount of the feed liquid. The PID feedback control model is used for adjusting the water content of the outlet in real time, comparing the measured value of the water content of the outlet with a target value, taking the target deviation value as the input of the PID feedback control model, carrying out self-adaptive learning according to the input feed liquid injection quantity, and further determining and adjusting parameter values of P, I and D, so that the control of the water content of the outlet is realized, the stability of the control of the water content of the outlet in batches is improved, and the consistency of the control among batches is increased.
As shown in fig. 2, the method further comprises:
s5: acquiring outlet water content and feed liquid injection amount in a cut stem feeding process within set time in real time, and fitting according to a time relation to obtain a regression fitting function of the outlet water content and the feed liquid injection amount;
s6: and determining the value range of the PID parameters according to the regression fitting function, so that the water content PID feedback control model performs PID parameter adjustment according to the value range in the cut stem feeding process in the same batch.
Specifically, the inputs (i.e., control parameters) and outputs (control results) of the control process are first determined before regression analysis is performed to model the control process for blade charging. The current control mode can be that the temperature of hot air is adjusted through the opening of a steam valve, and then the feedback control of the water content of an outlet is realized through adjusting the spraying amount of the monolith liquid. And if the water content of the outlet is higher, reducing the water content of the outlet by reducing the injection amount of the feed liquid, and if the water content of the outlet is lower, increasing the injection amount of the feed liquid to increase the water content of the outlet. The control of the feed liquid injection amount is mainly automatically completed through a PID feedback control model, and an operator can manually adjust the feed liquid injection amount according to actual conditions.
As shown in fig. 2, the method further comprises:
s7: collecting a value sample of the water content of the outlet of each batch, and calculating the mean square error of each batch after each batch is finished;
s8: and if the mean square errors of two continuous batches are continuously increased, adjusting the PID parameters in the water content PID feedback control model.
Specifically, after each batch is finished, the quality consistency of the batch is analyzed. There are many evaluation methods for batch quality, and a simpler and common evaluation method is adopted to calculate the Mean Square Error (MSE):
wherein n is the number of samples obtained in each batch, yiTaking the value of the water content of the outlet in each sample, yTThe mean value of the water content at the outlet.
In practical applications, we expect that a smaller MSE is better, and a smaller MSE indicates a more stable process quality. If the MSE of two consecutive batches is increased, it indicates that a new change occurs in the production process, which causes the current control mode to be not adapted to the actual production, and therefore, the current control mode needs to be adjusted.
Further, the temperature feedback control model for establishing the hot air temperature and the steam valve opening degree comprises the following steps:
the temperature feedback control model divides the actual value of the hot air temperature into N intervals by taking the target value of the hot air temperature as the center, determines the steam valve openings corresponding to different intervals, and controls the steam valve openings to reach corresponding values according to the interval where the actual value of the hot air temperature is located so as to realize the control of the hot air temperature.
In practical application, the hot air temperature is divided into eleven subareas by taking a target value as a center. If the temperature of the hot air is more than 64, the opening degree of the valve is adjusted to 70; if the temperature of the hot air is between 62 and 64, the opening degree of the valve is adjusted to 65; if the temperature of the hot air is between 61 and 62, the opening degree of the valve is adjusted to be 62; if the temperature of the hot air is between 60.5 and 61 and the current value of the hot air is greater than the value of the hot air at the last moment, adjusting the opening degree of the valve to be 61; if the temperature of the hot air is between 60.5 and 61 and the current value of the hot air is less than the value of the hot air at the previous moment, the opening degree of the valve is adjusted to be 60; if the temperature of the hot air is between 60 +/-0.5, the opening degree of the valve is adjusted to be 60; if the temperature of the hot air is between 59 and 59.5 and the current value of the hot air is greater than the hot air value at the last moment, adjusting the opening degree of the valve to be 60; if the temperature of the hot air is between 59 and 59.5 and the current value of the hot air is smaller than the hot air value at the last moment, adjusting the opening degree of the valve to be 59; if the temperature of the hot air is between 58 and 59, the opening degree of the valve is adjusted to 58; if the temperature of the hot air is between 56 and 58, the opening degree of the valve is adjusted to 57; if the temperature of the hot air is less than 56 ℃, the opening degree of the valve is adjusted to 55.
Further, the temperature feedback control model for establishing the hot air temperature and the steam valve opening further comprises:
and acquiring a measured value of the hot air temperature, and calculating to obtain a temperature difference value according to the target value of the hot air temperature.
And establishing a temperature PID feedback control model, and adjusting the opening of a steam valve according to the temperature difference value so as to control the temperature of hot air.
Specifically, a value obtained by subtracting the hot air temperature target value and the hot air temperature actual measurement value is used as a temperature difference value, the temperature difference value is used as an input of a temperature PID feedback control model, the temperature PID feedback control model outputs an opening degree adjusting value, the opening degree of a steam valve is adjusted, and the hot air temperature is changed to reduce the temperature difference value until the hot air temperature target is reached.
Therefore, the invention provides a quality control method for stem shred feeding, which is characterized in that the opening of a steam valve and the injection quantity of a feed liquid are respectively adjusted by setting a PID (proportion integration differentiation) feedback control model for controlling the inlet and outlet water content of a temperature feedback control module so as to control the hot air temperature and the outlet water content, the problem that the control on the spraying proportion and the uniformity of the feed liquid is inaccurate when stem shred feeding is carried out in the prior art is solved, the accuracy of the feed liquid proportion of stem shred feeding of each brand and the stability of the process outlet water content can be improved, and the quality control capability of the production.
Correspondingly, the invention also provides a quality control system for charging cut stems, which comprises: the first acquisition unit is used for setting the feed liquid proportion according to a set value and acquiring a hot air temperature target value and an outlet water content target value corresponding to the stem shred feeding. And the temperature control unit is used for establishing a temperature feedback control model of the hot air temperature and the opening of the steam valve, and controlling the opening of the steam valve according to the temperature feedback control model and the target value of the hot air temperature so as to control the hot air temperature in the charging machine. And the second acquisition unit is used for acquiring an actual measurement value of the outlet water content of the cut stem feeding process and acquiring a target deviation value of the outlet water content according to the target value of the outlet water content and the actual measurement value. And the moisture content control unit is used for establishing a moisture content PID feedback control model and is used for adjusting the feed liquid injection amount according to the target deviation value so as to perform feedback control on the moisture content of the outlet, so that the moisture content of the outlet of each batch of cut stem feeding process is controlled according to the target value.
The system further comprises: and the fitting unit is used for acquiring the outlet water content and the feed liquid injection amount in the cut stem feeding process within set time in real time, and fitting according to a time relation to obtain a regression fitting function of the outlet water content and the feed liquid injection amount. And the first PID parameter adjusting unit is used for determining the value range of the PID parameters according to the regression fitting function, so that the moisture content PID feedback control model can carry out PID parameter adjustment according to the value range in the cut stem feeding process in the same batch.
The system further comprises: and the error calculation unit is used for acquiring the value sample of the water content of the outlet of each batch and calculating the mean square error of the batch after each batch is finished. And the second PID parameter adjusting unit is used for adjusting the PID parameters in the water content PID feedback control model when the mean square errors of two continuous batches are continuously increased.
Further, the temperature control unit includes: and the temperature partition control module is used for dividing the actual value of the hot air temperature into N intervals by taking the target value of the hot air temperature as a center, determining the opening of the steam valve corresponding to different intervals, and controlling the opening of the steam valve to reach a corresponding value according to the interval where the actual value of the hot air temperature is located so as to realize the control of the hot air temperature.
Further, the temperature control unit further includes: the temperature PID control module is used for acquiring a hot air temperature measured value and calculating a temperature difference value according to the hot air temperature target value; and establishing a temperature PID feedback control model, and adjusting the opening of a steam valve according to the temperature difference value so as to control the temperature of hot air.
Therefore, the quality control system for stem shred feeding provided by the invention has the advantages that the opening of the steam valve and the injection quantity of the feed liquid are respectively adjusted by setting the PID feedback control model for controlling the inlet and outlet water content of the temperature feedback control module so as to control the hot air temperature and the outlet water content, the problem that the control on the spraying proportion and the uniformity of the feed liquid is inaccurate when the stem shred is fed is solved, the accuracy of the feed liquid proportion of each brand of stem shred feeding and the stability of the process outlet water content can be improved, and the quality control capability of the production process is improved.
The construction, features and functions of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the present invention is not limited to the embodiments shown in the drawings, and all equivalent embodiments modified or modified by the spirit and scope of the present invention should be protected without departing from the spirit of the present invention.
Claims (10)
1. A quality control method for charging cut stems is characterized by comprising the following steps:
setting a feed liquid ratio according to a set value, and acquiring a hot air temperature target value and an outlet water content target value corresponding to the cut stem feeding;
establishing a temperature feedback control model of the hot air temperature and the opening of a steam valve, and controlling the opening of the steam valve according to the temperature feedback control model and the target value of the hot air temperature so as to control the hot air temperature in the charging machine;
acquiring a measured value of the outlet water content of the cut stem feeding process, and acquiring a target deviation value of the outlet water content according to the target value of the outlet water content and the measured value;
and establishing a water content PID feedback control model for regulating the feed liquid injection amount according to the target deviation value so as to perform feedback control on the outlet water content, so that the outlet water content of the cut stem feeding process of each batch is controlled according to the target value.
2. The cut rolled stem charging quality control method according to claim 1, characterized by further comprising:
acquiring outlet water content and feed liquid injection amount in a cut stem feeding process within set time in real time, and fitting according to a time relation to obtain a regression fitting function of the outlet water content and the feed liquid injection amount;
and determining the value range of the PID parameters according to the regression fitting function, so that the water content PID feedback control model performs PID parameter adjustment according to the value range in the cut stem feeding process in the same batch.
3. The cut rolled stem charging quality control method according to claim 2, characterized by further comprising:
collecting a value sample of the water content of the outlet of each batch, and calculating the mean square error of each batch after each batch is finished;
and if the mean square errors of two continuous batches are continuously increased, adjusting the PID parameters in the water content PID feedback control model.
4. The cut stem charging quality control method according to claim 3, wherein the temperature feedback control model for establishing the hot air temperature and the steam valve opening comprises:
the temperature feedback control model divides the actual value of the hot air temperature into N intervals by taking the target value of the hot air temperature as the center, determines the steam valve openings corresponding to different intervals, and controls the steam valve openings to reach corresponding values according to the interval where the actual value of the hot air temperature is located so as to realize the control of the hot air temperature.
5. The cut stem charging quality control method according to claim 4, wherein the temperature feedback control model for establishing the hot air temperature and the steam valve opening further comprises:
acquiring a measured value of the hot air temperature, and calculating to obtain a temperature difference value according to the target value of the hot air temperature;
and establishing a temperature PID feedback control model, and adjusting the opening of a steam valve according to the temperature difference value so as to control the temperature of hot air.
6. The utility model provides a reinforced quality control system of stalk silk which characterized in that includes:
the first acquisition unit is used for setting a feed liquid proportion according to a set value and acquiring a hot air temperature target value and an outlet water content target value corresponding to the stem shred feeding;
the temperature control unit is used for establishing a temperature feedback control model of the temperature of the hot air and the opening of the steam valve, and controlling the opening of the steam valve according to the temperature feedback control model and the target value of the temperature of the hot air so as to control the temperature of the hot air in the charging machine;
the second acquisition unit is used for acquiring an actual measurement value of the outlet water content of the cut stem feeding process and acquiring a target deviation value of the outlet water content according to the target value of the outlet water content and the actual measurement value;
and the moisture content control unit is used for establishing a moisture content PID feedback control model and is used for adjusting the feed liquid injection amount according to the target deviation value so as to perform feedback control on the moisture content of the outlet, so that the moisture content of the outlet of each batch of cut stem feeding process is controlled according to the target value.
7. The stem charging quality control system according to claim 6, further comprising:
the fitting unit is used for acquiring the outlet water content and the feed liquid injection amount in the cut stem feeding process within set time in real time, and fitting according to a time relation to obtain a regression fitting function of the outlet water content and the feed liquid injection amount;
and the first PID parameter adjusting unit is used for determining the value range of the PID parameters according to the regression fitting function, so that the moisture content PID feedback control model can carry out PID parameter adjustment according to the value range in the cut stem feeding process in the same batch.
8. The stem charging quality control system according to claim 7, further comprising:
the error calculation unit is used for acquiring the value sample of the water content of the outlet of each batch and calculating the mean square error of each batch after each batch is finished;
and the second PID parameter adjusting unit is used for adjusting the PID parameters in the water content PID feedback control model when the mean square errors of two continuous batches are continuously increased.
9. The stem charging quality control system according to claim 8, wherein the temperature control unit comprises:
and the temperature partition control module is used for dividing the actual value of the hot air temperature into N intervals by taking the target value of the hot air temperature as a center, determining the opening of the steam valve corresponding to different intervals, and controlling the opening of the steam valve to reach a corresponding value according to the interval where the actual value of the hot air temperature is located so as to realize the control of the hot air temperature.
10. The stem charging quality control system according to claim 9, wherein the temperature control unit further comprises:
the temperature PID control module is used for acquiring a hot air temperature measured value and calculating a temperature difference value according to the hot air temperature target value; and establishing a temperature PID feedback control model, and adjusting the opening of a steam valve according to the temperature difference value so as to control the temperature of hot air.
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| Publication number | Priority date | Publication date | Assignee | Title |
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