Tobacco leaf outlet control method

Abstract

The invention provides a tobacco leaf outlet control method, and belongs to the technical field of tobacco process control. The method comprises the steps that the first flow of incoming tobacco leaves at a feeding port of a first-stage threshing machine is obtained through a first flow meter, and the incoming tobacco leaves are whole tobacco leaves subjected to moisture regaining treatment; based on a preset threshing control strategy, the rotating speed of the first-stage threshing machine is dynamically adjusted according to the first flow, so that the incoming tobacco leaves are threshed, a first-class mixture screened by a screen in the first-stage threshing machine is obtained, and the first-class mixture is conveyed to a multi-stage air separation machine; and based on the preset constraint condition of the blade yield, the air speed of the multi-stage air separation machine is dynamically adjusted according to a preset air speed adjusting strategy, so that air separation screening is conducted on the first type of mixture, pure blades are obtained, and the blade yield of the pure blades is larger than or equal to a specified threshold value. Therefore, the tobacco leaf yield is improved, and the stability of the tobacco leaf threshing and winnowing process is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of tobacco process control, and in particular to a tobacco leaf ejection control method. Background Art

[0002] The traditional tobacco leaf threshing and air separation process primarily uses a first-stage threshing machine to separate whole tobacco leaves into leaves and stems. Then, an air separator uses the principle of airflow suspension to separate the leaves and stems. This process relies on fixed parameter settings, such as threshing roller speed and air separation wind speed. These core parameters, such as threshing roller speed and wind speed, are often preset based on experience. The process control objective is primarily to achieve basic separation of leaves and stems. The ability to fine-tune key indicators such as yield and wind speed is insufficient, resulting in large fluctuations in the yield of pure leaves, which can easily reduce the quality of the pure leaves produced. Summary of the Invention

[0003] In view of this, the purpose of the embodiments of the present application is to provide a tobacco leaf output control method, which can improve the problem that during the tobacco leaf beating and air separation process, the output rate of pure leaves fluctuates greatly due to insufficient fine-tuning control capabilities, which easily reduces the quality of the output pure leaves.

[0004] To achieve the above technical objectives, the technical solutions adopted in this application are as follows:

[0005] The present application provides a method for controlling tobacco leaf discharge, the method comprising:

[0006] Obtaining, by means of a first flow meter, a first flow rate of incoming tobacco leaves at a feed port of a first-stage threshing machine, wherein the incoming tobacco leaves are whole tobacco leaves that have undergone a moisture conditioning treatment;

[0007] Based on a preset threshing control strategy, dynamically adjusting the rotation speed of the first-stage threshing machine according to the first flow rate to thresh the incoming tobacco leaves, obtaining a first-type mixture screened by a screen in the first-stage threshing machine, and conveying the first-type mixture to a multi-stage air separator, wherein the first-type mixture includes at least one of leaves, stems, and stemmed tobacco leaves;

[0008] Based on the preset constraints of the blade output rate and according to the preset wind speed adjustment strategy, the wind speed of the multi-stage air separator is dynamically adjusted to perform wind separation on the first type of mixture to obtain pure blades, so that the blade output rate of the pure blades is greater than or equal to the specified threshold.

[0009] In some optional embodiments, based on a preset threshing control strategy, dynamically adjusting the rotation speed of the first-stage threshing machine according to the first flow rate to thresh the incoming tobacco leaves includes:

[0010] Based on the preset threshing control strategy and the first flow rate, the target speed of the first-stage threshing machine is determined, which is expressed as:

[0011]

[0012] Where ω(t) refers to the target speed of the first-stage thresher; ω0 refers to the initial speed; K p , K i , K d Respectively represent the proportional coefficient, integral coefficient, and differential coefficient; e Y (t) represents the deviation of the film output rate; t refers to time; K f Refers to the fragmentation rate deviation adjustment coefficient; e F (t) refers to the fragmentation rate prediction deviation; F max Refers to the upper threshold of the fragmentation rate; Y target Indicates the expected film output rate; Y real (t) represents the actual film output rate; F target Refers to the target fragmentation rate; f(C,Q in ,F pred ) represents the compensation function; C represents the toughness coefficient of tobacco leaves; F pred is the predicted value of fragmentation rate; Q in represents the first flow rate; Q max represents the maximum flow rate of tobacco leaves fed into the feed port of the first-stage threshing machine; σ() refers to the Sigmoid function;

[0013] The constraint boundary of the rotation speed of the first-stage leaf thresher is:

[0014]

[0015] Where Q bace represents the reference flow rate of tobacco leaves entering the feed port of the first-stage threshing machine; Q out Refers to the tobacco leaf flow rate at the outlet of the first-stage threshing machine; α, β, γ and δ represent the first characteristic coefficient, the second characteristic coefficient, the third characteristic coefficient and the fourth characteristic coefficient respectively; Y min Indicate the lower threshold of leaf rate;

[0016] The first-stage threshing machine is controlled to operate at the target speed to thresh the incoming tobacco leaves.

[0017] In some optional embodiments, the method further comprises:

[0018] When the predicted value of the fragmentation rate is higher than the preset fragmentation rate, a first warning prompt is issued through a first prompt module;

[0019] When the pure blade output rate obtained by the multi-stage wind distributor is lower than the preset blade output rate, a second warning prompt is issued through the second prompt module.

[0020] In some optional embodiments, based on a preset constraint condition of the blade output rate and according to a preset wind speed adjustment strategy, the wind speed of the multi-stage air separator is dynamically adjusted to perform air separation and screening on the first type of mixture to obtain pure blades, including:

[0021] Based on the preset constraints of the film output rate and the preset wind speed adjustment strategy, the target wind speed of the i-th stage wind distributor in the multi-stage wind distributor is determined, which is expressed as:

[0022]

[0023] The preset constraints are:

[0024]

[0025] Where V wind (t) represents the target wind speed of the multi-stage wind turbine; V base Indicates the inlet flow rate of the multi-stage air distributor; express; represents the stem rate of tobacco leaves; Y represents the instantaneous leaf output rate; V represents the current wind speed; e -0.1T represents the time decay term; e represents a natural constant; T represents the operating time of the multi-stage wind distributor;

[0026] Control the i-th stage air separator to operate at the corresponding target wind speed to perform multi-stage air separation screening on the first type of mixture to obtain pure blades and the second type of mixture after the i-th stage air separation, where i is 1 to I in sequence, and I is the total number of stages of the multi-stage air separator.

[0027] In some optional embodiments, the method further comprises:

[0028] Obtaining a second flow rate of the pure blades through a second flow meter at the first outlet of each stage of the multi-stage air separator, and obtaining a third flow rate of the second type of mixture through a third flow meter at the second outlet of each stage of the air separator;

[0029] According to the second flow rate and the third flow rate of each stage of the air distributor, the sheet output rate corresponding to each stage of the air distributor and the total sheet output rate of the multi-stage air distributor are determined.

[0030] In some optional embodiments, the method further comprises:

[0031] The second type of mixture outputted from the multi-stage air separator is inputted into a second-stage leaf threshing machine;

[0032] Based on the preset beating control strategy, according to the first flow rate of the second type of mixture input to the j-stage beating machine, the rotation speed of the j-stage beating machine is adjusted to beat the incoming tobacco leaves to obtain the first type of mixture after being screened by the screen in the j-stage beating machine, and the first type of mixture output by the j-stage beating machine is conveyed to the multi-stage air separator; and based on the preset constraint conditions of the sheet output rate, according to the preset wind speed adjustment strategy, the wind speed of the multi-stage air separator is dynamically adjusted to perform air separation on the first type of mixture output by the j-stage beating machine to obtain pure leaves, wherein j is sequentially taken from 2 to J, and J is an integer greater than or equal to 2.

[0033] In some optional embodiments, the method further comprises:

[0034] The dust collecting mechanism in the multi-stage air separator is controlled to remove fine powder of the first type of mixture during the air separation process.

[0035] The invention adopting the above technical solution has the following advantages:

[0036] In the technical solution provided in the present application, based on the preset beating control strategy, the rotation speed of the first-stage beating machine is dynamically adjusted according to the first flow rate of the incoming tobacco leaves collected in real time at the feed port of the first-stage beating machine, and based on the preset constraint conditions of the sheet output rate, the wind speed of the multi-stage air separator is dynamically adjusted according to the preset wind speed adjustment strategy. In this way, the sheet output rate of the incoming tobacco leaves (i.e., the first type of mixture) screened after beating can be closed-loop controlled, which improves the problem of static parameters and extensive control in the existing leaf beating and air separation process, resulting in insufficient fine-tuning control capabilities, and is conducive to improving the sheet output rate, improving the stability of the tobacco leaf beating and air separation process, and improving the quality of the output pure leaves. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The present application may be further illustrated by the non-limiting embodiments provided in the accompanying drawings. It should be understood that the following drawings illustrate only certain embodiments of the present application and are therefore not to be construed as limiting the scope of the present application. It is understood that a person skilled in the art can derive other relevant drawings from these drawings without inventive effort.

[0038] Figure 1 A flow chart of a tobacco leaf discharge control method provided in an embodiment of the present application.

[0039] Figure 2 Schematic diagram of the leaf-threshing wind scene provided in an embodiment of the present application.

[0040] Icons: 210 - first-stage defoliator; 220 - second-stage defoliator; 310 - one dozen first-stage air separator; 320 - one dozen second-stage air separator; 330 - two dozen first-stage air separator; 340 - two dozen second-stage air separator. DETAILED DESCRIPTION

[0041] The present application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that similar or identical parts in the drawings or descriptions are numbered the same. Implementations not shown or described in the drawings are known to those of ordinary skill in the art. In the description of this application, the terms "first," "second," etc. are used solely to distinguish descriptions and are not to be construed as indicating or implying relative importance.

[0042] The present application provides a control device that may include a processor and a memory. The memory stores a computer program that, when executed by the processor, enables the control device to perform corresponding steps in the tobacco leaf discharge control method described below.

[0043] The control device may be, but is not limited to, a personal computer, an industrial computer, etc. The control device is communicatively connected to the controlled devices such as the leaf thresher and the wind distributor, and can be used to control the rotation speed of the leaf thresher and the wind speed of the wind distributor.

[0044] Please refer to Figure 1 and Figure 2 The present application provides a tobacco leaf ejection control method that can be applied to the above-mentioned control device, and the control device executes or implements each step of the method. The tobacco leaf ejection control method can include the following steps:

[0045] Step 110: obtaining a first flow rate of incoming tobacco leaves at a feed port of a first-stage threshing machine through a first flow meter, wherein the incoming tobacco leaves are whole tobacco leaves that have undergone a moisture conditioning treatment;

[0046] Step 120: Based on a preset threshing control strategy and the first flow rate, dynamically adjusting the rotation speed of the first-stage threshing machine to thresh the incoming tobacco leaves, obtaining a first-type mixture screened by a screen in the first-stage threshing machine, and conveying the first-type mixture to a multi-stage air separator, wherein the first-type mixture includes at least one of leaves, stems, and stemmed tobacco leaves.

[0047] Step 130, based on the preset constraint conditions of the blade output rate and according to the preset wind speed adjustment strategy, dynamically adjust the wind speed of the multi-stage air separator to perform wind separation on the first type of mixture to obtain pure blades, so that the blade output rate of the pure blades is greater than or equal to the specified threshold.

[0048] In the above-mentioned embodiment, based on the preset beating control strategy, the rotation speed of the first-stage beating machine is dynamically adjusted according to the first flow rate of the incoming tobacco leaves collected in real time at the feed port of the first-stage beating machine, and based on the preset constraint conditions of the sheet output rate, the wind speed of the multi-stage air separator is dynamically adjusted according to the preset wind speed adjustment strategy. In this way, the sheet output rate of the incoming tobacco leaves (i.e., the first type of mixture) screened after beating can be closed-loop controlled, which improves the problem of static parameters and extensive control in the existing leaf beating and air separation process, resulting in insufficient fine control capabilities, and is conducive to improving the sheet output rate, improving the stability of the tobacco leaf beating and air separation process, and improving the quality of the output pure leaves.

[0049] The following will describe in detail the steps of the tobacco leaf output control method as follows:

[0050] In this embodiment, the feed inlet of each stage of the threshing machine is provided with a corresponding flow meter for collecting the flow rate of the incoming tobacco leaves. For example, the feed inlet of the first stage of the threshing machine is provided with a first flow meter for collecting the flow rate of the incoming tobacco leaves at the feed inlet of the first stage of the threshing machine as the first flow rate.

[0051] The two outlets of each stage of the air separator can be provided with flow meters, which are respectively used to collect the flow of pure leaves screened by the air separation and the flow of the remaining mixture, which usually contains pure tobacco stems and tobacco leaves with stems.

[0052] Before threshing, the tobacco leaves (the entire leaf) need to be tempered. This tempering process is an existing process, for example, by spraying water or steam on the dried tobacco leaves to humidify them, making them softer and more flexible for subsequent threshing.

[0053] In step 110, the first flow meter can be used to collect the flow rate of the incoming tobacco leaves at the feed inlet of the first-stage threshing machine in real time as the first flow rate. It can be understood that the use of the first flow meter is conducive to the control device automatically monitoring the size of the incoming tobacco leaf flow rate.

[0054] In step 120, the preset threshing control strategy may be an improved PID control algorithm, which dynamically adjusts the rotation speed of the first-stage threshing machine by introducing a compensation function and constraint conditions.

[0055] For example, in step 120, based on a preset threshing control strategy, the rotation speed of the first-stage threshing machine is dynamically adjusted according to the first flow rate to thresh the incoming tobacco leaves, including:

[0056] Based on the preset threshing control strategy and the first flow rate, the target speed of the first-stage threshing machine is determined, which is expressed as:

[0057]

[0058] Where ω(t) refers to the target speed of the first-stage thresher; ω0 refers to the initial speed; K p , K i , K d Respectively represent the proportional coefficient, integral coefficient, and differential coefficient; e Y (t) represents the deviation of the film output rate; t refers to time; K f Refers to the fragmentation rate deviation adjustment coefficient, the value range is [0,1]; e F (t) refers to the fragmentation rate prediction deviation; F max Refers to the upper threshold of the fragmentation rate; Y target Indicates the expected film output rate; Y real (t) represents the actual film output rate; F target Refers to the target fragmentation rate; f(C,Q in ,F pred ) represents the compensation function, which is used to integrate the correction of multiple factors on the rotation speed; C represents the toughness coefficient of the tobacco leaf, which is the tensile strength of the tobacco leaf (referring to the ability of the tobacco leaf to resist breaking during the stretching process); F pred is the predicted value of fragmentation rate; Q in represents the first flow rate; Q max represents the maximum flow rate of tobacco leaves entering the feed port of the first-stage threshing machine; σ() refers to the Sigmoid function, which is used to convert linear input into a nonlinear adjustment factor;

[0059] The constraint boundary of the rotation speed of the first-stage leaf thresher is:

[0060]

[0061] Where Q bace represents the reference flow rate of tobacco leaves entering the feed port of the first-stage threshing machine; Q out Refers to the tobacco leaf flow rate at the outlet of the first-stage threshing machine; α, β, γ and δ represent the first characteristic coefficient, the second characteristic coefficient, the third characteristic coefficient and the fourth characteristic coefficient respectively; Y min Indicate the lower threshold of leaf rate;

[0062] The first-stage threshing machine is controlled to operate at the target speed to thresh the incoming tobacco leaves.

[0063] In this embodiment, the proportional coefficient, integral coefficient, and differential coefficient can be flexibly set according to actual conditions. As an example, K p =0.8; K i =0.15; K d =0.05.

[0064] In the calculation formula of ω0 in the above formula (2), 0.02 is obtained by fitting multiple sets of toughness test data. The coefficient 0.15 is determined according to the maximum load test of the equipment. in =Q max When the speed is too high, the speed needs to be reduced by 15% to prevent overload.

[0065] In the compensation function f(C,Q in ,F pred ) in the calculation formula, the coefficient 0.8 represents the basic adjustment weight, ensuring that when there is no compensation effect (i.e. tobacco leaf toughness C and flow rate Q in Within the normal operating range), the speed correction benchmark maintains 80% of the original efficiency. The coefficient 0.2 represents the upper limit of the dynamic adjustment amplitude of the feedforward compensation. It is determined through experiments that the speed adjustment amplitude is limited to no more than 20% of the reference value to avoid overshoot. The coefficient 0.5 represents the scaling factor of the tobacco leaf toughness compensation item. The coefficient 0.5 is obtained through material fatigue testing. For example, it means that for every increase of 1 specified unit (the unit can be the unit of tensile strength, such as N / m) of tobacco leaf toughness, the compensation effect is improved by 0.5 units. The coefficient 25 represents the normalization coefficient of the flow rate effect, which comes from the matching relationship between the flow sensor range and the toughness compensation item. In the compensation function, the fragmentation rate related item is 0.15σ(·), that is, the higher the predicted value of the fragmentation rate, the smaller the compensation function, which ultimately reduces the roller speed and suppresses further growth of the fragmentation rate. The coefficient 0.15 is obtained through calibration.

[0066] In the above formula (3), the first characteristic coefficient, the second characteristic coefficient, the third characteristic coefficient, and the fourth characteristic coefficient can all be flexibly set according to actual conditions. As an example, α = 1.2; β = 0.8, the flow sensitivity correction factor; γ = 2.5, a composite coefficient including temperature and humidity compensation; δ = 0.03, the differential term weight, determined by Kalman filter optimization. The index 2.5 is obtained by observing the relationship between the number of fragments and the rotation speed through high-speed photography; the index 1.8 is based on the cumulative effect of the fragmentation energy in the material flow impact test; and the index -0.6 represents the toughness protection factor in material fracture mechanics.

[0067] In this embodiment, using formula (3), a nonlinear relationship between the fragmentation rate, the rotational speed, and the flow rate can be established, providing a constraint boundary for the rotational speed control.

[0068] In this embodiment, the preset leaf threshing control strategy is based on the physical properties of tobacco leaves (C) and flow rate (Q in ) feedforward compensation, combined with the output rate deviation (e Y The PID feedback of (t)) can realize the adaptive adjustment of the leaf thresher speed.

[0069] As an optional implementation, the method further includes:

[0070] When the predicted value of the fragmentation rate is higher than the preset fragmentation rate, a first warning prompt is issued through a first prompt module;

[0071] When the pure blade output rate obtained by the multi-stage wind distributor is lower than the preset blade output rate, a second warning prompt is issued through the second prompt module.

[0072] In this embodiment, the preset fragmentation rate and the preset fragmentation rate can be flexibly set according to actual conditions. When the predicted fragmentation rate exceeds the preset fragmentation rate, it indicates that the fragmentation rate is too high, and the tossing machine should be controlled to reduce its speed to reduce the predicted fragmentation rate. When the fragmentation rate is too high, a first prompt module emits a sound, light, or other prompt as a warning. The first prompt module can be an audio and light prompt module located near the tossing machine, which can emit sound, light, or other prompt signals.

[0073] The second prompt module may be an audio-visual prompt module provided near the multi-stage wind distributor.

[0074] The use of the first prompt module and the second prompt module is helpful for management personnel to promptly discover abnormalities in the fragmentation rate and the output rate, and thus to take corresponding remedial measures in a timely manner.

[0075] In step 130 , the designated threshold value may be flexibly set according to actual conditions and is not specifically limited here.

[0076] In step 130, based on the preset constraint of the blade output rate and according to the preset wind speed adjustment strategy, the wind speed of the multi-stage air separator is dynamically adjusted to perform air separation and screening on the first type of mixture to obtain pure blades, including:

[0077] Based on the preset constraints of the film output rate and the preset wind speed adjustment strategy, the target wind speed of the i-th stage wind distributor in the multi-stage wind distributor is determined, which is expressed as:

[0078]

[0079] The preset constraints are:

[0080]

[0081] Where V wind (t) represents the target wind speed of the multi-stage wind turbine; V base Indicates the inlet flow rate of the multi-stage air distributor; express; represents the stem rate of tobacco leaves; Y represents the instantaneous leaf output rate; V represents the current wind speed; e -0.1T represents the time decay term; e represents a natural constant; T represents the operating time of the multi-stage wind distributor;

[0082] Among the preset constraints, the coefficient of 6.5 is the minimum suspension wind speed determined by the wind tunnel test, the coefficient of 0.08 is the flow-wind speed conversion coefficient, the coefficient of 0.5 represents the maximum allowable wind speed fluctuation amplitude (anti-turbulence threshold), and the coefficient of -0.1 represents the empirical attenuation rate;

[0083] Control the i-th stage air separator to operate at the corresponding target wind speed to perform multi-stage air separation screening on the first type of mixture to obtain pure blades and the second type of mixture after the i-th stage air separation, where i is 1 to I in sequence, and I is the total number of stages of the multi-stage air separator.

[0084] In this embodiment, the number of stages of the multi-stage air distributor can be flexibly set according to actual conditions, for example, 2 stages, 3 stages, etc.

[0085] As an example, the multi-stage air distributor includes a first-stage air distributor and a second-stage air distributor. The implementation process of step 130 may be:

[0086] Based on the preset constraint condition of the film output rate and according to the preset wind speed adjustment strategy, determining the target wind speed of the first stage wind distributor in the multi-stage wind distributor;

[0087] Controlling the first-stage air separator to operate at the corresponding target wind speed to perform air separation and screening on the first-type mixture to obtain pure leaves that have passed the first-stage air separation and the second-type mixture;

[0088] Based on the preset constraint condition of the film output rate and according to the preset wind speed adjustment strategy, determining the target wind speed of the second stage wind distributor in the multi-stage wind distributor;

[0089] The second-stage air separator is controlled to operate at the corresponding target wind speed to perform air separation on the second-type mixture output by the first-stage air separator to obtain pure leaves that have passed the second-stage air separation and a new second-type mixture.

[0090] Understandably, during the air separation and screening process, the leaves are lifted up by the vertical airflow due to their lower density, while the stemmed tobacco leaves and pure stems fall directly due to their greater weight.

[0091] After multiple stages of winnowing, the output materials are: pure leaves from each stage and a final mixture of stemmed leaves. The pure leaves can be collected directly and sent to the redrying process. The pure leaves from each stage can be processed separately, as their purity and quality may vary. The final mixture (such as stemmed leaves) can be fed into the second-stage threshing machine for further threshing.

[0092] In this embodiment, the method further includes:

[0093] Obtaining a second flow rate of the pure blades through a second flow meter at the first outlet of each stage of the multi-stage air separator, and obtaining a third flow rate of the second type of mixture through a third flow meter at the second outlet of each stage of the air separator;

[0094] According to the second flow rate and the third flow rate of each stage of the air distributor, the sheet output rate corresponding to each stage of the air distributor and the total sheet output rate of the multi-stage air distributor are determined.

[0095] It is understandable that each air separator will continue to receive tobacco materials and continue to perform air separation during operation. Taking a dozen first-stage air separators 310 as an example, the air separation process is as follows:

[0096] The inlet of a dozen first-stage air separators 310 continuously receives tobacco leaf material (i.e., the first-category mixture) output by the first-stage thresher. Then, the dozen first-stage air separators 310 air-separate the received tobacco leaf material to obtain pure tobacco leaf material and a second-category mixture. Specifically, during the air separation process, the tobacco leaf material, due to its lower density, is lifted by the vertical airflow and collected in the collection bin; the stemmed tobacco leaf material and pure tobacco stems, due to their greater weight, fall directly and are output as the second-category mixture to a dozen second-stage air separators 320. The dozen first-stage air separators 310 continuously receive tobacco leaf material and repeat the aforementioned process until all tobacco leaf material output by the first-stage thresher is air-separated, at which point the air separation process for the dozen first-stage air separators 310 ends.

[0097] The output rate of each level of air separator can be: Y1 represents the blade output rate of each air distributor during the current statistical cycle; Y2 represents the second flow rate measured by the second flowmeter during the current statistical cycle, which is the total flow rate of pure blades output by each air distributor during the current operating cycle; Y3 represents the third flow rate measured by the third flowmeter during the current statistical cycle, which is the total flow rate of the second type of mixture output by each air distributor during the current operating cycle. The length of a statistical cycle can be flexibly determined based on actual conditions and is not specifically limited here.

[0098] For the same batch of tobacco leaves, there is a certain time interval between the threshing of the leaves by the threshing machine and the air separation by the air separator, as well as between the air separation operations of different air separators. That is, the tobacco leaves that have just been threshed need to wait for a period of time before completing multiple air separations. Engineers can obtain this time interval through test calibration. For example, the time interval between the threshing of the first-stage threshing machine and the air separation of the first-stage air separator is t1, and the time interval between the i-th air separator and the i+1-th air separator is t i+1 , so the total output rate of the multi-stage air separator is Y total The calculation method can be:

[0099]

[0100] Where Y total represents the total leaf output rate of the multi-stage air separator, which can also be equated to the leaf output rate of the first-stage thresher in the corresponding historical period (obtained by the aforementioned time interval calibration); I represents the total number of stages of the multi-stage air separator. For example, if the multi-stage air separator consists of the first-stage air separator and the second-stage air separator, then I = 2; Y 2i It represents the flow rate of pure tobacco leaves collected by the i-th level air separator for the same batch of tobacco leaves; It represents the total flow of all pure leaves collected by all air separators for the same batch of tobacco leaves. The time interval between the i-th level air separator and the i+1-th level air separator is t i+1 ; Y 3I It indicates the total flow of the second type mixture output by the last stage air separator for the same batch of tobacco leaf materials.

[0101] In this embodiment, the calculated output rate corresponding to each level of air separator and the total output rate of the multi-level air separator can be limited in real time through the display screen. In this way, by counting the output rate of each level of air separator and the total output rate of the multi-level air separator, it is convenient for management personnel to intuitively view the data in the air separation screening process.

[0102] The output rate of the first-stage leaf thresher is: the total output rate of the multi-stage air separator used for air separation and screening of the first type of mixture output by the first-stage leaf thresher.

[0103] Generally speaking, when the corresponding fragmentation rate is met (i.e., the fragmentation rate is lower than the corresponding threshold), after the first-stage leaf threshing machine threshes the leaves, the higher the output rate of the first-stage air separator, the higher the profit of the pure leaves produced by the overall threshing. target Y can be the expected output rate of the first-stage wind distributor; real (t) can be the actual flake output rate of the first-stage air separator. In this way, the operator can adjust the expected flake output rate and fragmentation rate so that the pure leaves produced by the leaf threshing machine always maintain the highest yield. The fragmentation rate is calculated as follows: the weight of the fragments in the pure leaves ÷ the weight of the pure leaves × 100%. Among them, the fragments in the pure leaves refer to leaves with an area less than the corresponding area threshold (the area threshold can be flexibly determined according to actual conditions). The method of calculating the weight of the fragments is conventional and will not be repeated here.

[0104] In this embodiment, the method further includes:

[0105] The second type of mixture outputted from the multi-stage air separator is inputted into a second-stage leaf threshing machine;

[0106] Based on the preset beating control strategy, according to the first flow rate of the second type of mixture input to the j-stage beating machine, the rotation speed of the j-stage beating machine is adjusted to beat the incoming tobacco leaves to obtain the first type of mixture after being screened by the screen in the j-stage beating machine, and the first type of mixture output by the j-stage beating machine is conveyed to the multi-stage air separator; and based on the preset constraint conditions of the sheet output rate, according to the preset wind speed adjustment strategy, the wind speed of the multi-stage air separator is dynamically adjusted to perform air separation on the first type of mixture output by the j-stage beating machine to obtain pure leaves, wherein j is sequentially taken from 2 to J, and J is an integer greater than or equal to 2.

[0107] Please refer to Figure 2 The arrow direction indicates the output direction of the corresponding tobacco material. As an example, the following will illustrate the processing flow of secondary threshing and secondary air separation of incoming tobacco leaves:

[0108] In the first step, the incoming tobacco leaves are threshed by the first-stage threshing machine 210. After being screened by the screen of the first-stage threshing machine 210, a first type of mixture A (which may include tobacco leaves, tobacco stems, and tobacco leaves with stems) is obtained;

[0109] In the second step, the first type of mixture A is conveyed to a dozen first-stage air separators 310 for air separation to obtain pure leaves A and the second type of mixture A (usually including tobacco stems, stemmed tobacco leaves and some leaves). The pure leaves A enter the collection bin.

[0110] In the third step, the second type mixture A is conveyed to a dozen second-stage air separators 320 for further air separation to obtain pure leaves B and the second type mixture B (usually containing stems and stemmed tobacco leaves). The pure leaves B are sent to the collection bin.

[0111] In the fourth step, the second type mixture B is output to the second-stage threshing machine 220 for further threshing to obtain the first type mixture B (including tobacco leaves, tobacco stems, and tobacco leaves with stems);

[0112] In the fifth step, the first type mixture B is conveyed to the second first-stage air separator 330 for air separation to obtain pure leaves C and the second type mixture C (usually including tobacco stems, stemmed tobacco leaves and some leaves). The pure leaves C enter the collection bin.

[0113] In the sixth step, the second-category mixture C is transported to the second-stage second-stage air separator 340 for further air separation to obtain pure leaves D and the second-category mixture D (usually containing tobacco stems and tobacco leaves with stems). The pure leaves D enter the collection bin; the second-category mixture D is used as tobacco stems and will undergo subsequent tobacco stem processing.

[0114] The control process of each level of leaf thresher can refer to the detailed process of step 120; the control process of each level of wind distributor can refer to the detailed process of step 130, which will not be repeated here. It should be noted that the expected output rate Y of each level of leaf thresher is target It can be different and can be flexibly adjusted according to actual conditions. In addition, the pure leaves screened out at each level of wind separation can be collected independently.

[0115] In this embodiment, the workflow of the second-stage threshing machine is identical or similar to that of the first-stage threshing machine, with the difference being that the threshing machine typically employs fewer rollers because the second-stage threshing input is relatively small. The air separation process for the tobacco material output from the second-stage threshing machine is similar to the air separation process for the tobacco material output from the first-stage threshing machine (i.e., the first-class mixture after screen screening). The air separation process for the tobacco material output from the second-stage threshing machine utilizes a multi-stage air separator that is separate from the multi-stage air separator corresponding to the first-stage threshing machine.

[0116] The tobacco leaf material output by the last stage threshing machine is screened by the multi-stage air separator, and the mixture output by the last stage air separator can be used as tobacco stems for subsequent processing of tobacco stems.

[0117] The flake yield rate is related to factors such as the thresher roller speed, the incoming tobacco leaf flow rate, the outgoing tobacco leaf flow rate, and the wind speed during air separation. The thresher roller speed and the wind speed during air separation are particularly correlated with the flake yield rate: a higher speed generally increases the flake yield rate, but also increases the fragmentation rate. Furthermore, a higher wind speed increases the flake yield rate, but this can easily lead to the inclusion of stemmed tobacco leaves in the air-separated leaves. Production processes require that stemmed tobacco leaves be eliminated or kept to a minimum. In this embodiment, by exploring the relationship between the flake yield rate and these parameters, corresponding control algorithm models are established, including preset threshing control strategies and preset wind speed adjustment strategies. Through improvements such as dynamic parameter optimization and multi-stage coordinated control, adaptive matching of process parameters is achieved, which is beneficial for improving the flake yield rate even with low fragmentation rates. For example, the flake yield rate of the first-stage air separation can be maximized, while the pure leaves output by the first-stage thresher are not overly fragmented. Furthermore, the incoming tobacco leaf flow rate is adapted to the tobacco leaf flow rate output by the thresher.

[0118] In some optional embodiments, the method further comprises:

[0119] The dust collecting mechanism in the multi-stage air separator is controlled to remove fine powder of the first type of mixture during the air separation process.

[0120] Fine dust usually consists of dust, broken tobacco leaves, broken tobacco stems, etc. By removing the fine dust, the quality of pure tobacco leaves and pure tobacco stems can be improved.

[0121] In the control device of this embodiment, the processor may be an integrated circuit chip having signal processing capabilities. The above-mentioned processor may be a general-purpose processor. For example, the processor may be a central processing unit (CPU), a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and may implement or execute the various methods, steps and logic block diagrams disclosed in the embodiments of this application.

[0122] The memory may be, but is not limited to, a random access memory, a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, etc. In this embodiment, the memory may be used to store preset leaf-threshing control strategies, preset constraints, preset wind speed adjustment strategies, etc. Of course, the memory may also be used to store programs, which the processor executes upon receiving an execution instruction.

[0123] It should be noted that those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the control device described above can refer to the corresponding processes of each step in the aforementioned method, and will not be elaborated here.

[0124] The present application also provides a computer-readable storage medium that stores a computer program, which, when executed on a computer, causes the computer to execute the tobacco leaf discharge control method described in the above embodiment.

[0125] The present application also provides a program product, which includes a computer program that, when executed by a processor, implements the tobacco leaf discharge control method described in the above embodiment.

[0126] Through the description of the above implementation methods, those skilled in the art can clearly understand that the present application can be implemented through hardware or by means of software plus a necessary general hardware platform. Based on this understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for enabling a computer device (which can be a personal computer, a control device, or a network device, etc.) to execute the methods described in each implementation scenario of the present application.

[0127] In the embodiments provided in the present application, it should be understood that the disclosed control device and method can also be implemented in other ways. The control device and method embodiments described above are merely schematic. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions and operations of the devices, methods and computer program products according to multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and a part of the module, program segment or code contains one or more executable instructions for implementing a specified logical function. It should also be noted that each box in the block diagram and / or flowchart, and the combination of the boxes in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system that performs a specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions. In addition, the functional modules in the various embodiments of the present application can be integrated together to form an independent part, or each module can exist alone, or two or more modules can be integrated to form an independent part.

[0128] The above description is merely an embodiment of the present application and is not intended to limit the scope of protection of the present application. For those skilled in the art, various modifications and variations of the present application are possible. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A tobacco leaf output control method, characterized in that: The method comprises: Obtaining, by means of a first flow meter, a first flow rate of incoming tobacco leaves at a feed port of a first-stage threshing machine, wherein the incoming tobacco leaves are whole tobacco leaves that have undergone a moisture conditioning treatment; Based on a preset threshing control strategy, dynamically adjusting the rotation speed of the first-stage threshing machine according to the first flow rate to thresh the incoming tobacco leaves, obtaining a first-type mixture screened by a screen in the first-stage threshing machine, and conveying the first-type mixture to a multi-stage air separator, wherein the first-type mixture includes at least one of leaves, stems, and stemmed tobacco leaves; Based on the preset constraints of the blade output rate and according to the preset wind speed adjustment strategy, the wind speed of the multi-stage air separator is dynamically adjusted to perform wind separation on the first type of mixture to obtain pure blades, so that the blade output rate of the pure blades is greater than or equal to the specified threshold.

2. The method according to claim 1, characterized in that Based on a preset threshing control strategy, dynamically adjusting the rotation speed of the first-stage threshing machine according to the first flow rate to thresh the incoming tobacco leaves, including: Based on the preset threshing control strategy and the first flow rate, the target speed of the first-stage threshing machine is determined, which is expressed as: Where ω(t) refers to the target speed of the first-stage thresher; ω0 refers to the initial speed; K p , K i , K d Respectively represent the proportional coefficient, integral coefficient, and differential coefficient; e Y (t) represents the deviation of the film output rate; t refers to time; K f Refers to the fragmentation rate deviation adjustment coefficient; e F (t) refers to the fragmentation rate prediction deviation; F max Refers to the upper threshold of the fragmentation rate; Y target Indicates the expected film output rate; Y real (t) represents the actual film output rate; F target Refers to the target fragmentation rate; f(C,Q in ,F pred ) represents the compensation function; C represents the toughness coefficient of tobacco leaves; F pred is the predicted value of fragmentation rate; Q in represents the first flow rate; Q max represents the maximum flow rate of tobacco leaves fed into the feed port of the first-stage threshing machine; σ() refers to the Sigmoid function; The constraint boundary of the rotation speed of the first-stage leaf thresher is: Where Q bace represents the reference flow rate of tobacco leaves entering the feed port of the first-stage threshing machine; Q out Refers to the tobacco leaf flow rate at the outlet of the first-stage threshing machine; α, β, γ and δ represent the first characteristic coefficient, the second characteristic coefficient, the third characteristic coefficient and the fourth characteristic coefficient respectively; Y min Indicate the lower threshold of leaf rate; The first-stage threshing machine is controlled to operate at the target speed to thresh the incoming tobacco leaves.

3. The method according to claim 2, characterized in that The method further comprises: When the predicted value of the fragmentation rate is higher than the preset fragmentation rate, a first warning prompt is issued through a first prompt module; When the pure blade output rate obtained by the multi-stage wind distributor is lower than the preset blade output rate, a second warning prompt is issued through the second prompt module.

4. The method according to claim 1, wherein Based on a preset constraint condition of the blade output rate and according to a preset wind speed adjustment strategy, the wind speed of the multi-stage air separator is dynamically adjusted to perform air separation and screening on the first type of mixture to obtain pure blades, including: Based on the preset constraints of the film output rate and the preset wind speed adjustment strategy, the target wind speed of the i-th stage wind distributor in the multi-stage wind distributor is determined, which is expressed as: The preset constraints are: Where V wind (t) represents the target wind speed of the multi-stage wind turbine; V base Indicates the inlet flow rate of the multi-stage air distributor; express; represents the stem rate of tobacco leaves; Y represents the instantaneous leaf output rate; V represents the current wind speed; e -0.1T represents the time decay term; e represents a natural constant; T represents the operating time of the multi-stage wind distributor; Control the i-th stage air separator to operate at the corresponding target wind speed to perform multi-stage air separation screening on the first type of mixture to obtain pure blades and the second type of mixture after the i-th stage air separation, where i is 1 to I in sequence, and I is the total number of stages of the multi-stage air separator.

5. The method according to claim 4, characterized in that The method further comprises: Obtaining a second flow rate of the pure blades through a second flow meter at the first outlet of each stage of the multi-stage air separator, and obtaining a third flow rate of the second type of mixture through a third flow meter at the second outlet of each stage of the air separator; According to the second flow rate and the third flow rate of each stage of the air distributor, the sheet output rate corresponding to each stage of the air distributor and the total sheet output rate of the multi-stage air distributor are determined.

6. The method according to claim 1, wherein The method further comprises: The second type of mixture outputted from the multi-stage air separator is inputted into a second-stage leaf threshing machine; Based on the preset beating control strategy, according to the first flow rate of the second type of mixture input to the j-stage beating machine, the rotation speed of the j-stage beating machine is adjusted to beat the incoming tobacco leaves to obtain the first type of mixture after being screened by the screen in the j-stage beating machine, and the first type of mixture output by the j-stage beating machine is conveyed to the multi-stage air separator; and based on the preset constraint conditions of the sheet output rate, according to the preset wind speed adjustment strategy, the wind speed of the multi-stage air separator is dynamically adjusted to perform air separation on the first type of mixture output by the j-stage beating machine to obtain pure leaves, wherein j is sequentially taken from 2 to J, and J is an integer greater than or equal to 2.

7. The method according to claim 1, characterized in that The method further comprises: The dust collecting mechanism in the multi-stage air separator is controlled to remove fine powder of the first type of mixture during the air separation process.

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