Characterization method of leaf yield and leaf structure control in leaf threshing and redrying equipment

Abstract

The present invention discloses a method for characterizing the tobacco sheet output rate and blade structure control of leaf threshing and redrying equipment. The method comprises the following steps: the tobacco shred output rate after tobacco sheets with different blade structures are made into leaf shreds, and then the actual tobacco output rate after the tobacco sheets are rolled into cigarettes is calculated. According to the actual tobacco output rates of the different blade structures, the ratio of the actual tobacco output rates of the different blade structures to the theoretical maximum tobacco output rate is calculated. The tobacco sheet structure coefficient is calculated according to the ratio of the actual tobacco output rates of the different blade structures to the theoretical maximum tobacco output rate, and the tobacco sheet rates corresponding to the different blade structures of the leaf threshing and redrying line. The effective tobacco sheet output coefficient is obtained by multiplying the tobacco sheet output rate and the tobacco sheet structure coefficient, thereby determining whether the tobacco sheet output rate and blade structure control of the batch are reasonable, providing a basis for the leaf threshing and redrying operation (such as adjusting the frame leaf, the rotating speed of the threshing roller and the wind distribution parameters, etc.), and further improving the production rationality of the leaf threshing and redrying equipment without investing in any hardware assistance, thereby reducing the production cost.

Description

Technical Field

[0001] The invention relates to the technical field of leaf threshing and redrying, and in particular to a method for characterizing a leaf output rate and a blade structure control of leaf threshing and redrying equipment. Background Art

[0002] After the tobacco leaves enter the threshing and redrying process, they are processed from complete tobacco leaves (raw tobacco) into tobacco sheets, and then go through three major links: storage and aging, tobacco leaf shredding, and cigarette rolling and packaging. For a long time, threshing and redrying, tobacco leaf shredding, and cigarette rolling and packaging have each had their own quality and economic rating indicators, but there has been no systematic research and correlation between the indicators of the three major links, and there is a lack of systematic guidance. The control of leaf structure in threshing and redrying belongs to this situation. Although there are many studies on the improvement of the large-piece rate, medium-piece rate, and large and medium-sized pieces in threshing and redrying, due to the lack of accurate guidance on the basis for the comprehensive control of the threshing and redrying leaf output rate and leaf structure, it is impossible to determine or achieve the goal of maximizing the overall quality and economic benefits (reducing tobacco leaf loss costs).

[0003] At present, some studies have been conducted on this situation, including the study by Wang Xiaohui et al., "Determination of Leaf Tobacco Yield of Leaf-Threshed Tobacco", which is used to eliminate the impact of different pure leaf contents on the tobacco leaf output rate, and accurately evaluate the control level of leaf-threshed and redried tobacco leaf output rate (tobacco leaf loss level); Yu Na's paper "Relationship between Leaf Tobacco Structure and Tobacco Cut Structure" is used to analyze and study the relationship between different leaf tobacco structures and tobacco cut structure, and supports the reverse deduction of the optimal leaf tobacco structure based on tobacco cut structure; Du Jinsong et al.'s paper "The Influence of Tobacco Cut Structure on Cigarette Physical Indicators" is used to reverse the optimal tobacco cut structure based on cigarette quality. However, due to the lack of correlation between the redrying indicators and the cigarette rolling process, the overall systematic and scientific nature is insufficient, and the basis for reverse deduction of the optimal leaf shape control for leaf-threshing and redrying based on relevant evidence is still insufficient.

[0004] Although the leaf structure of threshing and redrying is only a quality indicator in the redrying process, it ultimately has a significant impact on the output rate and quality of cigarettes. It is also the economic indicator with the greatest impact on the single-box consumption from tobacco leaves to cigarettes. Accurately formulating relevant indicators and determining the squareness and goals of leaf threshing and redrying can produce long-term and greater economic benefits. Every 0.1 percentage point reduction in single-box consumption can reduce tobacco leaf loss costs by 100 million yuan in the industry.

[0005] The present invention provides a method for controlling the sheet yield rate and leaf structure of leaf beating wind by using the sheet tobacco structure coefficient and the effective sheet yield coefficient according to the relationship between the tobacco shreds produced from tobacco shreds of different sizes and the tobacco yield rate and cigarette quality in the cigarette rolling process. The optimal values ​​of leaf beating, redrying and leaf structure control are determined according to the calculated effective sheet yield coefficient of tobacco leaves. Summary of the invention

[0006] In response to the above problems, the inventors provided a method for characterizing the sheet output rate and blade structure control of leaf threshing and redrying equipment. The effective sheet output coefficient of tobacco leaves was used to accurately correlate the leaf structure and sheet output rate indicators of leaf threshing and redrying with the cigarette rolling process. According to the calculated effective sheet output coefficient of tobacco leaves, a basis was provided for the leaf threshing and redrying operation, and the rationality of the leaf threshing and redrying sheet tobacco output rate and blade structure control was judged, thereby guiding production.

[0007] The present invention provides a method for characterizing the leaf output rate and leaf structure control of leaf threshing and redrying equipment, comprising the following steps:

[0008] Step S1: sampling the tobacco leaves after threshing and redrying;

[0009] The sampled tobacco leaves are screened according to the standard of GB / T21137 "Determination of tobacco leaf size" to form tobacco leaves with different leaf structures;

[0010] The tobacco leaves with different leaf structures are processed into shredded tobacco leaves respectively, and the corresponding shredded tobacco output rate is calculated;

[0011] Step S3: sampling the leaf shreds corresponding to different leaf structures respectively, and rolling the sampled leaf shreds into cigarettes; in the cigarette production process, picking out cigarettes with appearance defects, and counting the cigarettes to calculate the actual smoke yield of different leaf structures;

[0012] Step S4: Calculate the ratio of the actual smoke output rate of the different blade structures to the theoretical maximum smoke output rate according to the actual smoke output rate of the different blade structures;

[0013] Step S5: Calculate the tobacco sheet structure coefficient according to the ratio of the actual smoke yield of different leaf structures to the theoretical maximum smoke yield, and the tobacco sheet rates corresponding to the different leaf structures of the leaf threshing and redrying line; wherein the tobacco sheet rates corresponding to the different leaf structures of the leaf threshing and redrying line include: the large tobacco sheet rate Sd produced by the leaf threshing and redrying line, the medium tobacco sheet rate Sz produced by the leaf threshing and redrying line, the small tobacco sheet rate Sx produced by the leaf threshing and redrying line and the tobacco sheet fragment rate Ss produced by the leaf threshing and redrying line.

[0014] Step S6: Calculate the effective sheet output coefficient according to the sheet output rate and the sheet structure coefficient. The higher the effective sheet output coefficient is, the more reasonable the sheet output rate and blade structure control of the batch is.

[0015] The calculation method of effective film output coefficient is:

[0016] Effective sheet output coefficient = Y × sheet smoke structure coefficient

[0017] Among them, Y is the tobacco yield rate.

[0018] Furthermore, in step S6, the tobacco sheet output rate is

[0019]

[0020] Among them, Y is the tobacco strip output rate; T is the total mass of stemmed tobacco put into the leaf threshing and redrying line (dry basis); W is the total mass of tobacco strips produced by the leaf threshing and redrying line (dry basis).

[0021]

[0022] W=(CQ p +B p )×(1-G)×(1-S p )

[0023] H is the original tobacco flake content, unit (%);

[0024] S c is the moisture content of the original smoke, unit (%);

[0025] T i The mass of the original tobacco (wet-basis tobacco leaves) put into the threshing and redrying line in the same batch, unit (kg);

[0026] n is the total number of measurements;

[0027] C is the total mass of tobacco strips produced by the same batch of leaf threshing and redrying line (wet basis tobacco leaves), unit (kg);

[0028] Q p The total mass of other tobacco leaves added to this batch and packaged into finished products (wet basis tobacco leaves), unit (kg);

[0029] B p The total mass of the remaining tobacco leaves (wet-based tobacco leaves) in this batch that have not been packaged into finished products, unit (kg);

[0030] G is the stem content of this batch of tobacco leaves, unit (%);

[0031] S p It is the moisture content of this batch of tobacco slices, unit (%).

[0032] Furthermore, the step S3 comprises:

[0033] The shredded leaves prepared in step S2 are sampled after the temperature and humidity are balanced to 12.6%±0.2% by air conditioning;

[0034] The sampled leaf shreds are rolled into cigarettes using a cigarette-making machine. Before rolling the samples, the cigarette-making machine is maintained in the best condition, and the same batch of re-baked samples are rolled on the same day and in the same shift. The filter rods, rolling paper and all auxiliary materials used are kept consistent, and the cigarette-making machine setting parameters remain unchanged until the production of each sample in the batch is completed.

[0035] Further, in step S3;

[0036] Actual cigarette output rate = cigarette output / tobacco usage-number of shutdowns due to tobacco × 1000

[0037] The reason why the number of shutdowns due to tobacco × 1000 is that each shutdown results in the loss of about tobacco and auxiliary materials, equivalent to the value of about 1,000 cigarettes.

[0038] Cigarette output = number of qualified cigarettes + number of cigarettes with appearance defects unrelated to tobacco quality + number of cigarettes rejected by equipment unrelated to tobacco quality - number of cigarettes with substandard physical quality due to tobacco × 200;

[0039] The reason for the number of cigarettes that do not meet the physical quality standards due to tobacco cuts × 200 is that each cigarette that does not meet the physical quality standards results in the loss of approximately tobacco cuts and auxiliary materials, equivalent to the value of approximately 200 cigarettes.

[0040] The amount of tobacco used = the total amount of tobacco input - the amount of tobacco not rolled into cigarettes.

[0041] Further, in step S5;

[0042] The tobacco strip structure coefficient = (actual smoke yield rate of large strips / theoretical maximum smoke yield rate) × large strip rate of tobacco strips produced by the threshing and redrying line + (actual smoke yield rate of medium strips / theoretical maximum smoke yield rate) × medium strip rate of tobacco strips produced by the threshing and redrying line + (actual smoke yield rate of small strips / theoretical maximum smoke yield rate) × small strip rate of tobacco strips produced by the threshing and redrying line + (actual smoke yield rate of fragments / theoretical maximum smoke yield rate) × fragment rate of tobacco strips produced by the threshing and redrying line.

[0043] The cigarette structure coefficient of a cigarette with a circumference of 24.3 mm = 0.965Sd + 0.992Sz + 0.463Sx + 0.134Ss;

[0044] The cigarette structure coefficient of a cigarette with a circumference of 20 mm = 0.846Sd + 0.958Sz + 0.774Sx + 0.183Ss;

[0045] The cigarette structure coefficient of the cigarette with a circumference of 15.0-18.0 mm = 0.744Sd + 0.929Sz + 0.749Sx + 0.321Ss;

[0046] Among them, Sd is the large-piece rate of tobacco strips produced by the threshing and redrying line; Sz is the medium-piece rate of tobacco strips produced by the threshing and redrying line; Sx is the small-piece rate of tobacco strips produced by the threshing and redrying line; and Ss is the fragmentation rate of tobacco strips produced by the threshing and redrying line.

[0047] Furthermore, if the effective sheet output coefficient is less than 0.85, then according to the principle of maximizing the effective sheet output coefficient, different leaf thresher frame opening shapes, opening sizes, and first to fourth level leaf thresher roller speeds are tested and determined respectively, so as to improve the production rationality of the leaf threshing and re-drying equipment and reduce production costs.

[0048] Compared with the prior art, the present invention has the following beneficial effects:

[0049] (1) The present invention realizes accurate association between leaf structure and leaf yield rate index of threshing and redrying tobacco and the cigarette rolling process through the effective leaf yield coefficient of tobacco leaves, thereby achieving the characterization of the control of the output rate and leaf structure of threshing and redrying tobacco.

[0050] (2) The calculated effective sheet output coefficient of tobacco leaves can provide a basis for leaf threshing and redrying operations. By following the principle of maximizing the effective sheet output coefficient, the optimal leaf threshing and wind separation parameters, such as the shape and size of the leaf threshing machine frame, the leaf threshing roller speed and wind separation parameters, can be set through multiple tests. This can improve the rationality of leaf threshing and redrying equipment production without investing in any hardware assistance, thereby reducing production costs. DETAILED DESCRIPTION

[0051] The present invention is further described in detail below through specific implementation modes.

[0052] Example 1

[0053] This embodiment provides a method for characterizing the leaf output rate and leaf structure control of leaf threshing and redrying equipment, and the specific process is as follows:

[0054] Step S1: Take out 2500 kg of tobacco leaves after threshing and re-baking from the baking machine before packaging;

[0055] Step S2: Use a vibrating screen of the same specifications as GB / T21137 "Determination of tobacco leaf size" to separate large pieces (upper layer with a screen aperture of 24.5 mm), medium pieces (screen aperture between 12.5 mm and 24.5 mm), small pieces (screen aperture between 6.28 mm and 12.5 mm), fragments (screen aperture between 3.27 mm and 2.36 mm), and tobacco dust (screen aperture below 2.36 mm), and record the proportions.

[0056] Take 500kg of each of the large, medium, small and fragments screened out. If the small fragments and fragments are insufficient, they will be collected during the production process of the re-roasting production line to make up for them.

[0057] The large, medium and small pieces taken are passed through a small flow rate silk-making line (300-500kkg / h) to make leaf shreds. The silk-making process standards are produced in accordance with the "Cigarette Process Specifications" 2016 edition, Chapter 4-7, the center values ​​of the silk-making process requirements, and the tobacco output rate is calculated (moisture content converted to 12.6%).

[0058] Step S3: The produced tobacco is accurately sampled after the air-conditioning and the temperature and humidity are accurately balanced to 12.6% ± 0.2%. 250 kg of the sample is accurately sampled and the ZJ19 cigarette making machine, which is currently the most widely used in the industry, is used to roll cigarettes. Before rolling the samples, the cigarette making machine is maintained to the best condition. The same batch of re-baked samples are rolled on the same day and in the same shift. The filter rods and rolling paper and all auxiliary materials are kept consistent. The cigarette making machine setting parameters remain unchanged until the production of each sample of the batch is completed.

[0059] The rolling process indicators are as follows:

[0060] index Require Cigarette paper weight 32g Filter length 32mm Weight of 20 cigarettes 17.5 g Cigarette Circumference 24.3 mm Cigarette length 84 (including filter) mm

[0061] During the production process of cigarettes, cigarettes with appearance defects are removed, and the counting equipment removes the cigarettes to calculate the actual smoke yield. The smoke yield per unit weight of tobacco is calculated based on the number of qualified cigarettes. The smoke yield rate is calculated as follows:

[0062] Smoke output rate = cigarette output / tobacco usage - number of shutdowns due to tobacco × 1000.

[0063] The reason why the number of shutdowns due to tobacco × 1000 is that each shutdown results in the loss of about tobacco and auxiliary materials, equivalent to the value of about 1,000 cigarettes.

[0064] Cigarette output = number of qualified cigarettes + number of cigarettes with appearance defects unrelated to tobacco quality + number of cigarettes rejected by equipment unrelated to tobacco quality - number of cigarettes with substandard physical quality due to tobacco × 200;

[0065] The reason for the number of cigarettes that do not meet the physical quality standards due to tobacco cuts × 200 is that each cigarette that does not meet the physical quality standards results in the loss of approximately tobacco cuts and auxiliary materials, equivalent to the value of approximately 200 cigarettes.

[0066] The amount of tobacco used = the total amount of tobacco input - the amount of tobacco not rolled into cigarettes.

[0067] After statistical calculation, the actual smoke yield of leaves of different sizes is as follows based on the circumference of 24.3mm cigarettes:

[0068] Blade structure Smoke rate Blockbuster 1493pcs / kg Medium 1535pcs / kg Small piece 623pcs / kg Fragments 176pcs / kg

[0069] According to the actual smoke yield of different blade structures, the actual smoke yield / theoretical maximum smoke yield of blades of different sizes is calculated. (The theoretical maximum smoke yield of a cigarette with a circumference of 24.3mm is 1548 cigarettes / kg)

[0070] Blade structure Actual smoke rate / theoretical maximum smoke rate Blockbuster 96.48% Medium 99.22% Small piece 46.27% Fragments 13.35%

[0071] Step S5: the sheet cigarette structure coefficient of a cigarette with a circumference of 24.3 mm = 0.965Sd + 0.992Sz + 0.463Sx + 0.134Ss;

[0072] Among them, Sd is the large-piece rate of tobacco leaves produced by the threshing and redrying line; Sz is the medium-piece rate of tobacco leaves produced by the threshing and redrying line; Sx is the small-piece rate of tobacco leaves produced by the threshing and redrying line, and Ss is the fragment rate of tobacco leaves produced by the threshing and redrying line. Sd, Sz, Sx, and Ss are measured according to the method in GB / T21137 "Determination of tobacco leaf size", which will not be repeated here.

[0073] Repeat the above steps S1-S5, and adjust the shredded width to 0.85 and the cigarette circumference to 20 mm.

[0074] After statistical calculation, based on the 20mm circumference cigarette specification, the smoke yield of leaves of different sizes is as follows:

[0075] Blade structure Smoke rate Blockbuster 1658pcs / kg Medium 1879pcs / kg Small piece 1517pcs / kg Fragments 359pcs / kg

[0076] According to the actual smoke yield of different leaf structures, the actual smoke yield of different leaf sizes of 20mm circumference cigarettes / theoretical maximum smoke yield is calculated. (The theoretical maximum smoke yield of a 20mm circumference cigarette is 1961 cigarettes / kg).

[0077] Blade structure Actual smoke rate / theoretical maximum smoke rate Blockbuster 84.55% Medium 95.83% Small piece 77.36% Fragments 18.32%

[0078] The structural coefficient of a cigarette with a circumference of 20 mm = 0.846Sd + 0.958Sz + 0.774Sx + 0.183Ss.

[0079] Similarly, repeat steps S1-S5, adjust the shred width to 0.80, and adjust the cigarette circumference to 17 mm.

[0080] After statistical calculation, based on the circumference of 17mm cigarettes, the smoke yield of leaves of different sizes is as follows:

[0081] Blade structure Smoke rate Blockbuster 1907pcs / kg Medium 2382pcs / kg Small piece 1919pcs / kg Fragments 824pcs / kg

[0082] According to the actual smoke yield of different leaf structures, the actual smoke yield of different leaf sizes of 17mm cigarettes / theoretical maximum smoke yield is calculated. (The theoretical maximum smoke yield of a 17mm cigarette is 2564 cigarettes / kg)

[0083] Blade structure Actual smoke rate / theoretical maximum smoke rate Blockbuster 74.38% Medium 92.92% Small piece 74.86% Fragments 32.13%

[0084] The tobacco sheet structure coefficient of a cigarette with a circumference of 15.0-18.0 mm = 0.744Sd + 0.929Sz + 0.749Sx + 0.321Ss.

[0085] Step S6: Calculate the effective sheet output coefficient according to the sheet output rate and the sheet structure coefficient. The higher the effective sheet output coefficient is, the more reasonable the sheet output rate and blade structure control of the batch is.

[0086] Effective sheet output coefficient = finished tobacco sheet output rate × sheet tobacco structure coefficient.

[0087] The finished tobacco strip output rate Y is calculated according to the method in the document "Determination of the tobacco strip output rate of threshed tobacco leaves". The general process is: samples are taken from the batch to be produced, the amount of tobacco strips and moisture content in the sample tobacco leaves are tested, and the amount of tobacco strips in the original tobacco of this batch is converted; the amount of finished tobacco strips obtained after threshing and re-roasting of the batch of tobacco leaves is counted, the moisture content and the stem content in the leaves are tested, and the actual output of tobacco strips is calculated.

[0088] Specifically, the tobacco sheet output rate Y is:

[0089]

[0090] Among them, T is the total mass of stemmed tobacco put into the threshing and redrying line (dry basis); W is the total mass of tobacco strips produced by the threshing and redrying line (dry basis).

[0091]

[0092] W=(CQ p +B p )×(1-G)×(1-S p )

[0093] H is the original tobacco flake content, unit (%);

[0094] S c is the moisture content of the original smoke, unit (%);

[0095] T i The mass of the original tobacco (wet-basis tobacco leaves) put into the threshing and redrying line in the same batch, unit (kg);

[0096] n is the total number of measurements;

[0097] C is the total mass of tobacco strips produced by the same batch of leaf threshing and redrying line (wet basis tobacco leaves), unit (kg);

[0098] Q p The total mass of other tobacco leaves added to this batch and packaged into finished products (wet basis tobacco leaves), unit (kg);

[0099] B p The total mass of the remaining tobacco leaves (wet-based tobacco leaves) in this batch that have not been packaged into finished products, unit (kg);

[0100] G is the stem content of this batch of tobacco leaves, unit (%);

[0101] S p It is the moisture content of this batch of tobacco slices, unit (%).

[0102] Example 2

[0103] A cigarette company uses tobacco leaves produced by two tobacco leaf threshing and redrying line companies as raw materials to produce two brands of cigarettes, A and B, with a circumference of 24.3 mm. The production machines are all the same, 5 Passim90 cigarette making machines. After checking, the threshing and redrying information of the two brands of tobacco leaf raw materials is as follows.

[0104]

[0105]

[0106] According to the calculation based on the cigarette structure coefficient of 24.3mm cigarette circumference = 0.965Sd + 0.992Sz + 0.463Sx + 0.134Ss, the leaf structure coefficients of the two brands are as follows:

[0107]

[0108]

[0109] After actual tracking, it was found that the specifications of the two brands A and B cigarettes were designed to be consistent. The actual smoke yield of Brand A was 1507 cigarettes / kg, and the leaf consumption per box was 33.17kg / box, but the smoke yield of Brand B was 1489 cigarettes / kg, and the leaf consumption per box was 33.60kg / box.

[0110] According to the theoretical maximum smoke yield of 1548 cigarettes / kg for a 24.3mm circumference cigarette, the actual smoke yield of brand A / theoretical maximum smoke yield is 97.35%, and the actual smoke yield of brand B / theoretical maximum smoke yield is 96.19%. The actual smoke yield / theoretical maximum smoke yield of brand A and brand B is 1.012. The weighted leaf structure coefficient ratio of brand A and brand B is 1.009, and the deviation of the actual smoke yield / theoretical maximum smoke yield represented by the leaf structure coefficient of brands A and B is 0.3%, indicating that the leaf structure coefficient can accurately represent the actual smoke yield after mixing leaves of different sizes.

[0111] The historical production data of the two brands of tobacco leaves are as follows:

[0112]

[0113]

[0114] By reviewing the production history data of the two tobacco brands, it was found that the main problem of brand A was that the rate of large pieces of leaf threshing and redrying was too high, and the effective sheet output coefficient was low. The main problem of brand B was that the structure of some grades of leaves changed greatly, resulting in a low effective sheet output coefficient. This shows that both companies have problems to a certain extent.

[0115] Example 3

[0116] In order to improve the rationality of the leaf threshing and redrying production of the above two enterprises, an effective sheet output coefficient assessment incentive mechanism was implemented for the two redrying enterprises, and assistance was provided in studying how to improve the effective sheet output coefficient. The details are as follows:

[0117] 1. The opening dimensions of the leaf threshing machine frames of two redrying enterprises were tested and calculated. The diamond-shaped frames were converted according to the industry's common experience method, and the opening dimensions were multiplied by 1.25 based on the test value.

[0118] 2. On the premise that the leaf threshers at each level maintain the same leaf tearing rate and wind separation, preliminarily determine the leaf thresher roller speed and wind separation parameters of the leaf threshers at each level.

[0119] 2.1. On this basis, the opening size of the first-stage leaf thresher is the same (preliminary 7700mm 2 ) of the diamond frame and quadrilateral frame. The effective sheet output coefficients of the first-level leaf threshing machines of the two enterprises were calculated respectively. According to the principle of maximizing the effective sheet output coefficient, it was determined that the first-level leaf threshing machines of the two enterprises should use diamond frame.

[0120] 2.2. Based on 2.1, the first-stage leaf thresher uses diamond-shaped frames with different opening sizes (6700mm 2 , 7700mm 2 , 8700mm 2 ), according to the principle of maximizing the effective leaf output system, the opening size of the diamond frame of the first-level leaf threshing machine of the two enterprises is determined to be 7700mm 2 .

[0121] 2.3. On the basis of the maximum effective leaf output of the first-stage thresher, the opening size of the second-stage thresher is the same (preliminary setting is 6500mm 2 ) of diamond frame, quadrilateral frame, and hexagonal frame. The effective sheet output coefficients of the two companies' secondary leaf threshing machines were calculated respectively. According to the principle of maximizing the effective sheet output coefficient, it was determined that company A used diamond frame for the secondary leaf threshing machine, and company B used quadrilateral frame.

[0122] 2.4. Based on 2.3, the two enterprises’ secondary leaf threshing machines use frames with different opening sizes (5550mm 2 , 6040mm 2 , 6530mm 2 ), according to the principle of maximizing the effective output system, the opening size of the frame of the second-level leaf threshing machine of the enterprise is determined to be 6040mm 2 The opening size of the frame of the second-level leaf thresher of the enterprise is 6530mm 2 .

[0123] 2.5. Based on the maximum effective leaf output coefficient of the first and second level leaf thresher, the same opening size is used for the third level leaf thresher (preliminarily set at 5100mm2 ) of the quadrilateral frame and hexagonal frame. The effective sheet output coefficients of the three-level leaf threshing machines of the two enterprises were calculated respectively. According to the principle of maximizing the effective sheet output coefficient, it was determined that both enterprises A used hexagonal frames.

[0124] 2.6. Based on 2.5, the two enterprises’ three-level leaf threshing machines use fences with different opening sizes (4500mm 2 , 5100mm 2 , 5520mm 2 ), according to the principle of maximizing the effective leaf output system, the frame opening size of the third-level leaf threshing machine of Enterprise A is determined to be 5100mm 2 The opening size of the frame of the third-level leaf thresher of Enterprise B is 4500mm 2 .

[0125] 2.7. As the four-stage leaf threshing machine has little impact on the effective leaf output coefficient, the two enterprises maintain their original status.

[0126] 3. Based on steps 1 and 2, test the roller speeds of the first to fourth level leaf threshers respectively. According to the principle of maximizing the effective sheet output coefficient, the roller speeds of the leaf threshers of each level for the two enterprises are determined as follows.

[0127]

[0128] 4. Keep running according to the above set parameters. If the tobacco grade is changed, the tobacco quality and physical properties do not change much, and no adjustment is made. If the tobacco quality and physical properties change greatly, re-test and determine the frame and parameters according to steps 2.2 to step 3.

[0129] After one baking season, the structural coefficients of graded tobacco strips, the output rate of finished tobacco strips, and the effective output coefficient of tobacco strips of the two enterprises are as follows:

[0130]

[0131]

[0132] For two brands of tobacco leaves, the weighted leaf structure coefficient and weighted effective leaf coefficient were calculated according to the usage ratio of tobacco leaf grades and compared with historical data:

[0133]

[0134]

[0135] The effective sheet output coefficient is used to characterize the sheet output rate and blade structure control of the leaf threshing and redrying equipment, and then the leaf threshing machine frame and the leaf threshing roller speed are adjusted accordingly. The effective sheet output coefficients of Brand A and Brand B are increased by 0.2% and 0.3% respectively. Based on the usage of the two brands of tobacco leaves, without any hardware investment, the value of tobacco leaves can be saved by 528,000 yuan and 1.98 million yuan each year.

[0136] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A method for characterizing the leaf yield and leaf structure control of leaf threshing and redrying equipment, characterized in that: The following steps are involved: Step S1: sampling the tobacco leaves after threshing and redrying; Step S2: screening the sampled tobacco strips according to the standard of GB / T21137 "Determination of tobacco leaf size" to separate tobacco strips with different leaf structures; and shredding the tobacco strips with different leaf structures respectively, and calculating the corresponding tobacco shred output rate; Step S3: sampling the leaf shreds corresponding to different leaf structures respectively, and rolling the sampled leaf shreds into cigarettes; in the cigarette production process, picking out cigarettes with appearance defects, and counting the cigarettes to calculate the actual smoke yield of different leaf structures; Step S4: Calculate the ratio of the actual smoke output rate of the different blade structures to the theoretical maximum smoke output rate according to the actual smoke output rate of the different blade structures; Step S5: calculating the tobacco sheet structure coefficient according to the ratio of the actual smoke yield of different leaf structures to the theoretical maximum smoke yield, and the tobacco sheet ratio corresponding to the different leaf structures of the threshing and redrying line; Step S6: Calculate the effective sheet output coefficient according to the sheet output rate and the sheet structure coefficient. The higher the effective sheet output coefficient, the more reasonable the control of the sheet output rate and leaf structure of the batch; The calculation method of effective film output coefficient is: Effective sheet output coefficient = Y × sheet smoke structure coefficient Among them, Y is the tobacco yield rate; In step S6, the tobacco sheet output rate is: Among them, Y is the tobacco strip output rate; T is the total dry weight of the original tobacco put into the threshing and redrying line; W is the total dry weight of the tobacco strips produced by the threshing and redrying line; In the step S3, Actual cigarette output rate = cigarette output / tobacco usage - number of shutdowns due to tobacco × 1000; Among them, the output of cigarettes = the number of qualified cigarettes + the number of cigarettes with appearance defects unrelated to the quality of tobacco + the number of cigarettes rejected by the equipment unrelated to the quality of tobacco - the number of cigarettes with substandard physical quality due to tobacco × 200; Tobacco usage = total amount of tobacco input - amount of tobacco not rolled into cigarettes; In the step S5, The tobacco strip structure coefficient = (actual smoke yield rate of large strips / theoretical maximum smoke yield rate) × large strip rate of tobacco strips produced by the threshing and redrying line + (actual smoke yield rate of medium strips / theoretical maximum smoke yield rate) × medium strip rate of tobacco strips produced by the threshing and redrying line + (actual smoke yield rate of small strips / theoretical maximum smoke yield rate) × small strip rate of tobacco strips produced by the threshing and redrying line + (actual smoke yield rate of fragments / theoretical maximum smoke yield rate) × fragment rate of tobacco strips produced by the threshing and redrying line.

2. The characterization method according to claim 1, characterized in that The step S3 comprises: The shredded leaves prepared in step S2 are sampled after the temperature and humidity are balanced to 12.6%±0.2% by air conditioning; The sampled leaf shreds are rolled into cigarettes using a cigarette-making machine. Before rolling the samples, the cigarette-making machine is maintained in the best condition, and the same batch of re-baked samples are rolled on the same day and in the same shift. The filter rods, rolling paper and all auxiliary materials used are kept consistent, and the cigarette-making machine setting parameters remain unchanged until the production of each sample in the batch is completed.

3. The characterization method according to claim 1, characterized in that The structural coefficient of a cigarette with a circumference of 24.3 mm = 0.965Sd + 0.992Sz + 0.463Sx + 0.134Ss; The structural coefficient of a cigarette with a circumference of 20 mm = 0.846Sd + 0.958Sz + 0.774Sx + 0.183Ss; The cigarette structure coefficient of the cigarette with a circumference of 15.0-18.0 mm = 0.744Sd + 0.929Sz + 0.749Sx + 0.321Ss; Among them, Sd is the large-piece rate of tobacco strips produced by the threshing and redrying line; Sz is the medium-piece rate of tobacco strips produced by the threshing and redrying line; Sx is the small-piece rate of tobacco strips produced by the threshing and redrying line; and Ss is the fragmentation rate of tobacco strips produced by the threshing and redrying line.

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