CN111165858A - Method for establishing control model of leaf threshing process wrinkle shrinkage rate - Google Patents
Method for establishing control model of leaf threshing process wrinkle shrinkage rate Download PDFInfo
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- CN111165858A CN111165858A CN202010087137.0A CN202010087137A CN111165858A CN 111165858 A CN111165858 A CN 111165858A CN 202010087137 A CN202010087137 A CN 202010087137A CN 111165858 A CN111165858 A CN 111165858A
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- threshing
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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
- A24B3/07—Cutting or removing tie leaves; Cutting-off stem butts
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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
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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
- A24B3/10—Roasting or cooling tobacco
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Abstract
The invention relates to a method for establishing a control model of the wrinkle ratio of a threshing process, which is characterized in that threshing times and threshing air separation times in the threshing process are set; respectively setting the threshing frequency range of each threshing frequency and the threshing wind separation intensity range; in the threshing frequency and threshing wind strength range of each threshing frequency, optionally setting parameters of points to form a plurality of threshing process parameter sets; respectively threshing, detecting the structural distribution of tobacco flakes after threshing and redrying of parameter sets of each threshing procedure, and calculating the actual wrinkle shrinkage of the corresponding large and medium tobacco flakes; determining a key control index by performing correlation analysis; and obtaining a control model formula of the wrinkle ratio. The method defines the main parameters of the threshing process of threshing and redrying which influence the wrinkle rate, and can effectively regulate and control the wrinkle rate by adjusting according to the established control model.
Description
Technical Field
The invention belongs to the technical field of threshing and redrying control in a shredding process, and particularly relates to a method for establishing a wrinkling rate control model in a threshing process.
Background
Threshing and redrying are the first process of the tobacco shred making process of the cigarette industry enterprise, and redried tobacco strips are the basic raw materials of the cigarette industry enterprise. The threshing and redrying process flow is roughly divided into a tobacco moistening procedure, a threshing procedure and a redrying procedure, the large and medium tobacco shred ratio of the threshing and redrying finished tobacco shreds is an important index for examining redrying enterprises and is also one of the more relevant indexes of the cigarette industry enterprises, and the large and medium tobacco shred ratio of the threshing and redrying tobacco shreds is closely related to the whole tobacco shred ratio and the filling rate of the cigarette tobacco shreds. By analyzing the relationship between the large and medium leaf rate and the whole tobacco shred rate, the large and medium leaf rate is obtained and can only cause great influence on the whole tobacco shred rate within a certain interval, and the large and medium leaf rate is controlled within a certain interval as much as possible in the processing process, so that the whole tobacco shred rate of the tobacco shreds is ensured, the filling rate of the tobacco shreds is improved, the single-box tobacco consumption is reduced, and the economic benefit is improved.
The large and medium sheet rate of the tobacco leaves after threshing (before redrying) is higher, but the large and medium sheet rate of the tobacco leaves after redrying can be obviously reduced because the tobacco leaves are shriveled due to the evaporation of moisture and the change of temperature in the redrying process. Therefore, the wrinkle rate is controlled, the large and medium sheet rate after baking can be controlled to a certain degree, and then the sheet tobacco with better quality is processed according to the silk making collaborative requirement. The shrinkage ratio is a ratio of shrinkage of leaves larger than 12.7mm before and after redrying due to evaporation of moisture and temperature change.
For the problem of how to control the shrinkage rate, the prior art has a lot of researches, for example, a literature of 'research on shrinkage rate influence factors of cured tobacco threshing and redrying strips' published in Chinese tobacco science in 2011 proposes that under the condition of (12 +/-1)% moisture requirement, the steam dosage is reduced, the water adding amount of a high-pressure pump is increased, the shrinkage rate can be reduced, and the extensibility of the strips during moisture regain is increased. In a document of 'influence of redrying temperature on shrinkage rate and size distribution of tobacco strips' published in 2013 Chinese tobacco science, shrinkage rate of tobacco strips is in positive correlation with redrying temperature in the redrying process, the higher the temperature is, the larger the shrinkage rate is, and the shrinkage rate relationship of the tobacco strips at different parts is that lower tobacco strips are larger than middle tobacco strips and upper tobacco strips are larger than upper tobacco strips at the same temperature.
By combining the above viewpoint analysis, in the redrying process of threshing and redrying, the shrinkage rate is regulated and controlled by controlling the moisture and the redrying temperature, the temperature and moisture regulation principle is adopted, and the shrinkage rate is mainly controlled in the redrying process in the prior art.
Disclosure of Invention
The invention aims to provide a method for establishing a control model of the shrinkage rate of a threshing process, which is used for reducing the shrinkage rate by regulating and controlling the proportion of the threshing process to the large sheet rate on the premise of meeting the quality requirement of finished tobacco sheets in a threshing and redrying link.
The invention is realized by the following technical scheme:
a method for establishing a control model of the wrinkling rate of a threshing process comprises the following steps:
s1, setting threshing times D in threshing processnWherein n is a natural number, the number of times of threshing and air-classifying, FmWherein m is a natural number;
s2, respectively setting threshing frequency ranges of threshing times and threshing wind power ranges;
s3, selecting parameters of p points within the threshing frequency range of each threshing frequency and the threshing wind strength range of each threshing, and forming a group H of threshing process parameter group Hp；
S4, use HpPerforming leaf-beating on the set of leaf-beating procedure parameters, and detecting each leaf-beatingAfter the tobacco sheets are subjected to leaf threshing and redrying by the process parameter set, the structure distribution of the tobacco sheets is carried out, and the actual wrinkle ratios of the corresponding large and medium tobacco sheets are calculated;
s5, carrying out correlation analysis on the obtained data, and determining the leaf-beating times D which are in negative correlation with the wrinkle ratioKThreshing frequency and threshing wind number FLThe threshing wind separation strength is a key control index;
s6, obtaining a control model formula of the wrinkle ratio Y according to S5:
wherein A is a constant, B is a coefficient corresponding to the threshing times, C is a coefficient corresponding to the threshing air-classifying times, and k and L are natural numbers.
Further, the method comprises a verification procedure of converting H in S4pSubstituting the corresponding parameters in each group in the group threshing process parameter group into the control mode formula in S6 to obtain the predicted wrinkle ratio of each group, and comparing the predicted wrinkle ratio with the actual wrinkle ratio of each group;
if the error is within a set range, the control model formula of the wrinkle ratio Y is as follows:
the goodness of fit is high;
if the error is not in the set range, repeating S3-S6, and re-determining the control model formula of the wrinkle ratio Y.
The actual wrinkle ratio of the large and medium pieces is (the large and medium piece ratio after threshing-the large and medium piece ratio after redrying)/the large and medium piece ratio after threshing.
The invention has the beneficial effects that:
according to the technical scheme, the control model formula of the wrinkle ratio is determined, the wrinkle ratio is reduced by controlling the proportion of a large sheet ratio in the leaf-threshing process for the first time, and the wrinkle ratio can be regulated and controlled according to requirements.
Detailed Description
The technical solutions of the present invention are described in detail below by examples, and the following examples are only exemplary and can be used only for explaining and explaining the technical solutions of the present invention, but cannot be interpreted and explained as limitations to the technical solutions of the present invention.
The technical scheme mainly controls the threshing process, mainly adjusts the threshing roller speed and the air separation speed of the threshing process, reduces the large-medium slice rate, improves the medium slice rate, and simultaneously ensures the large-medium slice rate and the stem content in leaves.
The structure of the tobacco flakes means the degree of the size of the tobacco flakes, and is expressed by a large flake rate, a medium flake rate and a fragment rate.
The large sheet rate is more than 25.4 × 25.4mm2The tobacco flake is also called as a primary eye; the median plate rate was (25.4 × 25.4) - (12.7 × 12.7) mm2The tobacco flake is also called as two-mesh; the large and medium sheet rate is more than 12.7 x 12.7mm2The tobacco flake is the sum of the first eye and the second eye, which is also called the whole flake rate.
According to the technical scheme, a threshing process of threshing five times and threshing 14 times is adopted to establish a shrinkage rate control model.
On the premise of ensuring normal operation of threshing and redrying processing (no material blockage), threshing frequency ranges of threshing times are respectively set as follows: the frequency range of the five-time threshing is 32Hz-40 Hz; the strength ranges of the 14 threshing air separation are 20-45.
In this example, 7 point parameters were selected in each threshing frequency range, and 7 point parameters were also selected in each threshing wind strength range, and 7 sets of threshing process parameter sets were formed, named as test 1 to test 7, and are specifically shown in table 1.
Table 1 shows the detailed parameter table of each threshing process parameter set
After the 7 groups of threshing parameters are adopted for threshing respectively, the corresponding leaf structures of the groups after threshing and redrying are counted respectively for detection, and the actual wrinkle shrinkage of the large and medium pieces of each group is calculated, which is shown in table 2.
Actual wrinkle ratio of large and medium pieces after threshing-large and medium piece ratio after redrying)/large and medium piece ratio after threshing.
Table 2 shows the actual wrinkle shrinkage data of the groups after threshing and redrying
Wrinkle shrinkage rate scene factor analysis
And performing correlation analysis according to the data in the table 2, and obtaining that the wrinkle shrinkage rate is in a negative correlation with the five-time threshing frequency, the five-time threshing wind minute intensity, the six-time threshing wind minute intensity, the seven-time threshing wind minute intensity, the eleven-time threshing wind minute intensity and the twelve-time threshing wind minute intensity, so that the five-time threshing frequency, the five-time threshing wind minute intensity, the six-time threshing wind minute intensity, the seven-time threshing wind minute intensity, the eleven-time threshing wind minute intensity and the twelve-time threshing wind minute intensity are determined as key control indexes influencing the wrinkle shrinkage rate, and a model is established by adopting the key control indexes.
According to a control model formula of the wrinkle ratio Y:
wherein A is a constant, B is a coefficient corresponding to the number of times of threshing, C is a coefficient corresponding to the number of times of threshing and wind, and k and L are both coefficient tables 3 from natural numbers to the percentage of wrinkling Y.
TABLE 3 coefficient table of the crinkle rate control model calculated
The control model of the wrinkle ratio Y according to the present embodiment obtained from table 3 is:
Y＝0.630-0.016X1-0.008X2-0.008X3+0.012X4+0.004X5wherein X is1Frequency of five threshing, X2The strength of the wind fraction of the five threshed leaves, X3The strength of the six-time threshing air separation is X4Strength of wind-breaking for seven times, X5The strength of the leaves is measured by the wind score of twelve threshing operations.
And (4) a verification program, namely substituting the corresponding parameters in each group of the seven leaf-cutting process groups into a control model formula to obtain the predicted wrinkle ratio of each group, and comparing the predicted wrinkle ratio with the actual wrinkle ratio of each group to obtain an error value, wherein the error value is shown in a table 4.
| True value | Prediction | Error of the measurement |
| 0.13 | 0.14 | 0.01 |
| 0.11 | 0.12 | 0.01 |
| 0.11 | 0.12 | 0.00 |
| 0.10 | 0.10 | 0.01 |
| 0.09 | 0.10 | 0.01 |
| 0.09 | 0.10 | 0.01 |
| 0.08 | 0.09 | 0.01 |
The predicted wrinkle ratio is close to the actual wrinkle ratio and the errors are within the set range, so that the goodness of fit of the model is good, and a control model formula of the wrinkle ratio Y is obtained through the table 4:
meets the design requirements.
According to actual detection, in order to ensure normal processing (no material blockage, no shutdown and the like) of threshing and redrying, the regulation and control range of key index parameters is as follows:
the embodiment of the wrinkle rate control model of the application is as follows:
the control model is adopted in Fujian Sanming redrying factory for redrying, and key indexes influencing the wrinkle shrinkage rate are adjusted on the process parameters of conventional processing, which are shown in the following table:
| frequency Hz of once threshing | 38 |
| Secondary threshing frequency Hz | 37 |
| Frequency Hz of triple threshing | 35 |
| Frequency Hz of four threshing | 30 |
| Frequency Hz of five threshing | 40 |
| Strength of once threshing and air separating | 36 |
| Secondary threshing and air separating strength | 34 |
| Strength of wind fraction of tertiary threshing | 34 |
| Strength of wind separating for four times threshing | 40 |
| Strength of wind separation of five times of threshing | 31 |
| Strength of six-time threshing and air separating | 40 |
| Strength of wind-separating of seven times threshing | 42 |
| Strength of wind-separating for eight times of threshing | 40 |
| Strength of wind-separating for nine times of threshing | 39 |
| Strength of ten times threshing and air separating | 39 |
| Strength of eleven-time threshing and air separation | 38 |
| Twelve-time threshing wind separation strength | 38 |
| Strength of thirteen-times threshing and air separating | 33 |
| Strength of fourteen-times threshing and air separating | 32 |
The results of the measurements are shown in the following table:
through a control model formula of the wrinkle ratio Y:
the calculated and predicted wrinkle ratio is 8%, the actual wrinkle ratio is 7.93%, and the data are very close, which shows that the prediction effect of the control model of the wrinkle ratio established by the technical scheme is good.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (3)
1. A method for establishing a control model of the wrinkling rate of a threshing process is characterized by comprising the following steps:
s1, setting threshing times D in threshing processnWherein n is a natural number, the number of times of threshing and air-classifying, FmWherein m is a natural number;
s2, respectively setting threshing frequency ranges of threshing times and threshing wind power ranges;
s3, selecting parameters of p points within the threshing frequency range of each threshing frequency and the threshing wind strength range of each threshing, and forming a group H of threshing process parameter group Hp；
S4, use HpRespectively threshing the tobacco leaves by combining the threshing process parameter sets, respectively detecting the structural distribution of the tobacco leaves after threshing and redrying of each threshing process parameter set, and calculating the actual wrinkle ratio of the corresponding large and medium tobacco leaves;
s5, carrying out correlation analysis on the obtained data, and determining the leaf-beating times D which are in negative correlation with the wrinkle ratioKThreshing frequency and threshing wind number FLThe threshing wind separation strength is a key control index;
s6, obtaining a control model formula of the wrinkle ratio Y according to S5:
wherein A is a constant, B is a coefficient corresponding to the threshing times, C is a coefficient corresponding to the threshing air-classifying times, and k and L are natural numbers.
2. The method for establishing the wrinkle ratio control model in threshing process as claimed in claim 1, wherein step S6 is followed by a verification procedure for verifying H in S4pSubstituting corresponding parameters in each group in the group threshing process parameter group intoObtaining the predicted wrinkle ratio of each group by using a control mode formula in S6, and comparing the predicted wrinkle ratio with the actual wrinkle ratio of each group;
if the error is within a set range, the control model formula of the wrinkle ratio Y is as follows:
the goodness of fit is high;
if the error is not in the set range, repeating S3-S6, and re-determining the control model formula of the wrinkle ratio Y.
3. The method for establishing the threshing process reduction rate control model according to claim 1, wherein the actual reduction rate of the large and medium pieces is (the large and medium piece rate after threshing-the large and medium piece rate after redrying)/the large and medium piece rate after threshing.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102920004A (en) * | 2012-11-23 | 2013-02-13 | 中国烟草总公司郑州烟草研究院 | Technique for preparing tobacco stalks into stalk slices after threshing |
| CN104997147A (en) * | 2015-06-05 | 2015-10-28 | 中国烟草总公司郑州烟草研究院 | Bulk tobacco formula threshing and redrying processing technology |
| WO2017124402A1 (en) * | 2016-01-21 | 2017-07-27 | 常平 | Information pushing method during control of cigarette consumption, and cigarette case |
| CN107647470A (en) * | 2017-09-12 | 2018-02-02 | 河南中烟工业有限责任公司 | Beating and double roasting processing method that is a kind of while regulating and controlling the rate containing stalk in tobacco strip structure and leaf |
| CN108783573A (en) * | 2018-05-30 | 2018-11-13 | 滁州卷烟材料厂 | A method of improving size evenness of bladess of blades after defolate |
| CN110122915A (en) * | 2019-05-05 | 2019-08-16 | 贵州中烟工业有限责任公司 | A kind of beating and double roasting processing quality integrated evaluating method |
-
2020
- 2020-02-11 CN CN202010087137.0A patent/CN111165858B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102920004A (en) * | 2012-11-23 | 2013-02-13 | 中国烟草总公司郑州烟草研究院 | Technique for preparing tobacco stalks into stalk slices after threshing |
| CN104997147A (en) * | 2015-06-05 | 2015-10-28 | 中国烟草总公司郑州烟草研究院 | Bulk tobacco formula threshing and redrying processing technology |
| WO2017124402A1 (en) * | 2016-01-21 | 2017-07-27 | 常平 | Information pushing method during control of cigarette consumption, and cigarette case |
| CN107647470A (en) * | 2017-09-12 | 2018-02-02 | 河南中烟工业有限责任公司 | Beating and double roasting processing method that is a kind of while regulating and controlling the rate containing stalk in tobacco strip structure and leaf |
| CN108783573A (en) * | 2018-05-30 | 2018-11-13 | 滁州卷烟材料厂 | A method of improving size evenness of bladess of blades after defolate |
| CN110122915A (en) * | 2019-05-05 | 2019-08-16 | 贵州中烟工业有限责任公司 | A kind of beating and double roasting processing quality integrated evaluating method |
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