Wind separation control method

Abstract

This invention discloses an air separation control method applied to an air separation system. The air separation system includes a tobacco drying machine, a conveying mechanism, and a secondary air separation device arranged sequentially. Tobacco shreds flow sequentially through the drying machine, the conveying mechanism, and the secondary air separation device. A humidity meter for monitoring tobacco shred moisture is installed directly above the conveying mechanism. The air separation control method includes: obtaining the tobacco shred grade; determining the tobacco shred type based on the status of the drying machine; wherein the tobacco shred type includes headstock, tailstock, and middlestock; real-time monitoring and acquisition of the humidity of the tobacco shreds conveyed from the drying machine to the conveying mechanism; and controlling the secondary air separation device to perform air separation based on the tobacco shred grade, tobacco shred type, and tobacco shred moisture content. This method effectively improves the separation accuracy and effect of separating stems and twigs from tobacco shreds, and compared to existing technologies, it does not increase the air separation cost of the air separation system.

Description

TECHNICAL FIELD

[0001] The present application relates to the tobacco processing technical field, and particularly relates to a winnowing control method. BACKGROUND

[0002] In the process of tobacco production, in order to improve the quality of products, the stems in the tobacco are usually separated to improve the purity of the tobacco. At present, the winnowing control method in the prior art is to add a humidifying device after the cut tobacco machine to adjust the moisture of the tobacco delivered to the winnowing device to be roughly the same, and then to separate the stems in the tobacco through two-stage winnowing or three-stage winnowing. Another winnowing control method is to separate the stems in the tobacco by adjusting the opening degree of the air door of the winnowing device through two-stage winnowing or three-stage winnowing, so that the stems with a weight greater than that of the tobacco can be separated. However, the separation control method in the prior art does not consider the influence of the moisture change of the tobacco in the conveying process on the separation of the stems, resulting in the problems of poor separation precision and poor separation effect of the winnowing control method in the prior art. SUMMARY

[0003] The present application aims to provide a winnowing control method to solve the problems of poor separation precision and poor separation effect of the winnowing control method in the prior art.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0005] The winnowing control method, the winnowing system comprises a cut tobacco machine, a conveying mechanism and a two-stage winnowing device arranged in sequence, and the tobacco can flow through the cut tobacco machine, the conveying mechanism and the two-stage winnowing device in sequence, and a humidity tester for monitoring the humidity of the tobacco is arranged above the conveying mechanism, and the winnowing control method comprises the following steps:

[0006] Obtaining the tobacco brand;

[0007] Determining the tobacco type according to the state of the cut tobacco machine; wherein the tobacco type includes the beginning, the middle and the end of the tobacco;

[0008] Real-time monitoring and obtaining the humidity of the tobacco delivered from the cut tobacco machine to the conveying mechanism;

[0009] Controlling the two-stage winnowing device to perform winnowing according to the tobacco brand, the tobacco type and the humidity of the tobacco.

[0010] As a preferred embodiment, the specific steps of controlling the two-stage winnowing device to perform winnowing according to the tobacco brand, the tobacco type and the humidity of the tobacco include:

[0011] When the tobacco to be delivered to the cut tobacco drying machine is a tobacco head, the secondary air separation device is controlled to perform air separation according to the tobacco brand of the tobacco head and the moisture content of the tobacco head; when the tobacco to be delivered to the cut tobacco drying machine is a tobacco tail, the secondary air separation device is controlled to perform air separation according to the tobacco brand of the tobacco tail and the moisture content of the tobacco tail; and when the tobacco to be delivered to the cut tobacco drying machine is a tobacco middle, the secondary air separation device is controlled to perform air separation according to the tobacco brand of the tobacco middle and the moisture content of the tobacco middle.

[0012] Preferably, the specific steps of controlling the secondary air separation device to perform air separation according to the tobacco brand of the tobacco head and the moisture content of the tobacco head include:

[0013] obtaining a first set moisture value from a first table according to the tobacco brand and the tobacco type; wherein the tobacco brand, the tobacco type and the first set moisture value form the first table;

[0014] controlling the secondary air separation device to perform air separation according to the moisture content of the tobacco head and the first set moisture value.

[0015] Preferably, the specific steps of controlling the secondary air separation device to perform air separation according to the moisture content of the tobacco head and the first set moisture value include:

[0016] determining whether the moisture content of the tobacco head is greater than the first set moisture value;

[0017] if the moisture content of the tobacco head is greater than the first set moisture value, controlling the primary air door opening degree of the secondary air separation device to be adjusted to a first preset opening degree; after a time delay, controlling the secondary air door opening degree of the secondary air separation device to be adjusted to the first preset opening degree;

[0018] if the moisture content of the tobacco head is less than or equal to the first set moisture value, controlling the primary air door opening degree of the secondary air separation device to be adjusted to a second preset opening degree; after a time delay, adjusting the secondary air door opening degree of the secondary air separation device to the second preset opening degree;

[0019] wherein the first preset opening degree is greater than the second preset opening degree.

[0020] Preferably, the specific steps of controlling the secondary air separation device to perform air separation according to the tobacco brand of the tobacco tail and the moisture content of the tobacco tail include:

[0021] obtaining a second set moisture value from a second table according to the tobacco brand and the tobacco type; wherein the tobacco brand, the tobacco type and the second set moisture value form the second table;

[0022] controlling the secondary air separation device to perform air separation according to the moisture content of the tobacco tail and the second set moisture value.

[0023] As preferred, the specific step of controlling the secondary winnower to winnow according to the moisture of the tobacco material and the second set moisture value comprises:

[0024] judging whether the moisture of the tobacco material is less than the second set moisture value;

[0025] if the moisture of the tobacco material is less than the second set moisture value, controlling the first damper of the secondary winnower to be adjusted to a third preset opening degree, and after a time delay, controlling the second damper of the secondary winnower to be adjusted to the third preset opening degree;

[0026] if the moisture of the tobacco material is greater than or equal to the second set moisture value, controlling the first damper of the secondary winnower to be adjusted to a fourth preset opening degree, and after a time delay, controlling the second damper of the secondary winnower to be adjusted to the fourth preset opening degree;

[0027] wherein the fourth preset opening degree is greater than the third preset opening degree.

[0028] As preferred, the specific step of controlling the secondary winnower to winnow according to the moisture of the tobacco material and the second set moisture value comprises:

[0029] obtaining a third set moisture value from a third table according to the tobacco material brand and the moisture of the tobacco material; wherein the tobacco material brand, the tobacco material type and the third set moisture value form the third table;

[0030] judging whether the difference between the moisture of the tobacco material and the third set moisture value is greater than or equal to a minimum set difference value;

[0031] if the difference between the moisture of the tobacco material and the third set moisture value is greater than or equal to the minimum set difference value, keeping the current first damper of the secondary winnower unchanged, and controlling the second damper of the secondary winnower to be adjusted to increase by A%; wherein A is a positive number;

[0032] if the difference between the moisture of the tobacco material and the third set moisture value is less than the minimum set difference value, keeping the current first damper of the secondary winnower unchanged, keeping the current second damper of the secondary winnower unchanged, and returning to judge whether the difference between the moisture of the tobacco material and the third set moisture value is greater than or equal to the minimum set difference value.

[0033] As preferred, after the step of controlling the second damper of the secondary winnower to be adjusted to increase by A%, the method further comprises the following steps:

[0034] determining whether the difference between the moisture in the tobacco and the third set humidity value is greater than or equal to the first set difference value and less than the second set difference value; wherein the first set difference value = n*the minimum set difference value, the second set difference value = (n+1)*the minimum set difference value, and n is the number of times of determining whether the difference between the moisture in the tobacco and the third set humidity value is greater than or equal to the first set difference value and less than the second set difference value;

[0035] if the difference between the moisture in the tobacco and the third set humidity value is greater than or equal to the first set difference value and less than the second set difference value, keeping the current first-stage damper opening degree of the secondary air separation device unchanged and keeping the current second-stage damper opening degree of the secondary air separation device unchanged;

[0036] if the difference between the moisture in the tobacco and the third set humidity value is greater than or equal to the second set difference value, keeping the current first-stage damper opening degree of the secondary air separation device unchanged and controlling the second-stage damper opening degree of the secondary air separation device to increase by A%; returning to determining whether the difference between the moisture in the tobacco and the third set humidity value is greater than or equal to the first set difference value and less than the second set difference value;

[0037] if the difference between the moisture in the tobacco and the third set humidity value is less than the first set difference value, keeping the current first-stage damper opening degree of the secondary air separation device unchanged and controlling the second-stage damper opening degree of the secondary air separation device to decrease by A%; returning to determining whether the difference between the moisture in the tobacco and the third set humidity value is greater than or equal to the first set difference value and less than the second set difference value.

[0038] Preferably, the minimum set difference value is 0.2.

[0039] Preferably, the specific step of determining the state of the cut tobacco drying machine comprises determining the state of the cut tobacco drying machine according to the flow of cut tobacco delivered into the cut tobacco drying machine.

[0040] The present application has the following advantages:

[0041] The present application provides an air separation control method applied to an air separation system, wherein the air separation system comprises a cut tobacco drying machine, a conveying mechanism and a secondary air separation device arranged in sequence, cut tobacco can flow through the cut tobacco drying machine, the conveying mechanism and the secondary air separation device in sequence, and a humidity tester for monitoring the humidity of cut tobacco is arranged directly above the conveying mechanism; the air separation control method comprises the following steps: obtaining the brand of cut tobacco; determining the type of cut tobacco according to the state of the cut tobacco drying machine; wherein the type of cut tobacco comprises the head, the tail and the middle; monitoring and obtaining the humidity of cut tobacco delivered from the cut tobacco drying machine to the conveying mechanism in real time; and controlling the secondary air separation device to perform air separation according to the brand of cut tobacco, the type of cut tobacco and the humidity of cut tobacco.

[0042] For the cut tobacco delivered by the cut tobacco drying machine to the secondary air separation device, the head, the middle and the tail of the cut tobacco are delivered to the cut tobacco drying machine in turn, and the head, the middle and the tail of the cut tobacco are delivered to the secondary air separation device in turn through the conveying mechanism, so that the humidity of the head, the middle and the tail of the cut tobacco delivered to the secondary air separation device for air separation will be different due to the influence of different delivery time, specifically, the humidity of the head, the middle and the tail of the cut tobacco decreases in turn, therefore, based on this, the air separation control method classifies the cut tobacco, and then controls the secondary air separation device to air separation according to the cut tobacco brand, the cut tobacco type and the humidity of the cut tobacco, it can be understood that different control methods will be used to control the secondary air separation device to air separation for different brands of cut tobacco, different types of cut tobacco and different humidity of cut tobacco, which can effectively improve the separation precision and separation effect of separating the stems and leaves in the cut tobacco, and does not need to increase the air separation cost of the air separation system compared with the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0043] Figure 1 is the schematic diagram of the air separation system provided by the specific embodiment of the present application;

[0044] Figure 2 is the flow of the air separation control method provided by the specific embodiment of the present application Figure One ;

[0045] Figure 3 is the flow of the air separation control method provided by the specific embodiment of the present application Figure Two ;

[0046] Figure 4 is the flow of the air separation control method provided by the specific embodiment of the present application Figure Three ;

[0047] Figure 5 is the flow of the air separation control method provided by the specific embodiment of the present application Figure Four .

[0048] In the figure:

[0049] 1, cut tobacco drying machine; 2, vibrating trough; 3, conveying mechanism; 4, humidity tester; 5, secondary air separation device. DETAILED DESCRIPTION

[0050] The present application will be further described in detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application. In addition, it should be noted that only the parts related to the present application are shown in the drawings for convenience of description, not all the structures.

[0051] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0053] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0054] This invention provides an air separation system, such as Figure 1 As shown, the air separation system includes a tobacco drying machine 1, a conveying mechanism 3, and a secondary air separation device 5 arranged in sequence. Tobacco shreds flow sequentially through the drying machine 1, the conveying mechanism 3, and the secondary air separation device 5. A humidity meter 4 for monitoring the humidity of the tobacco shreds is installed directly above the conveying mechanism 3. Specifically, the drying machine 1 heats and evaporates the moisture in the tobacco shreds to adjust their humidity; the conveying mechanism 3 transports the tobacco shreds output from the drying machine 1 to the secondary air separation device 5; and the secondary air separation device 5 separates the stems and twigs from the tobacco shreds.

[0055] Specifically, such as Figure 1 As shown, the air separation system also includes a vibrating trough 2 arranged between the tobacco drying machine 1 and the conveying mechanism 3. The vibrating trough 2 can break up the tobacco output from the tobacco drying machine 1, so as to improve the effect of subsequent air separation by the secondary air separation device 5.

[0056] Further specifically, the winnowing system further comprises a controller, the controller is electrically connected with the cut tobacco dryer 1, the vibrating trough 2, the conveying mechanism 3, the humidity tester 4 and the secondary winnowing device 5, the controller can control the cut tobacco dryer 1, the vibrating trough 2 and the conveying mechanism 3 to work, and can control the secondary winnowing device 5 to work according to the humidity of the cut tobacco monitored by the humidity tester 4. The specific structure of the winnowing system belongs to the prior art, and will not be described here.

[0057] Specifically, for the cut tobacco conveyed by the cut tobacco dryer 1 to the secondary winnowing device 5, the head, the middle and the tail are conveyed to the cut tobacco dryer 1 in turn, and the head, the middle and the tail are conveyed to the secondary winnowing device 5 by the conveying mechanism 3 in turn, so that the humidity of the head, the humidity of the middle and the humidity of the tail conveyed to the secondary winnowing device 5 for winnowing will be different due to the different conveying time, and specifically, the humidity of the head, the humidity of the middle and the humidity of the tail decrease in turn.

[0058] Therefore, based on this, the application further provides a winnowing control method, which classifies the cut tobacco, and then controls the secondary winnowing device 5 to winnow according to the cut tobacco brand, the cut tobacco type and the humidity of the cut tobacco, so as to effectively improve the separation precision and separation effect of the stems and leaves in the cut tobacco, and does not need to increase the winnowing cost of the winnowing system compared with the prior art.

[0059] Specifically, as shown in the winnowing control method comprises: Figures 2-5

[0060] S100, obtaining the cut tobacco brand.

[0061] Specifically, the requirements for the content of stems and leaves in the cut tobacco are different for different cut tobacco brands.

[0062] S200, determining the cut tobacco type according to the state of the cut tobacco dryer 1. Specifically, when the state of the cut tobacco dryer 1 is determined, the cut tobacco type can be directly read according to the state of the cut tobacco dryer 1.

[0063] Specifically, the specific steps of determining the state of the cut tobacco dryer 1 comprise:

[0064] The state of the cut tobacco dryer 1 is determined according to the flow of the cut tobacco conveyed into the cut tobacco dryer 1. As an alternative, the state of the cut tobacco dryer 1 can also be determined according to weighing or the like.

[0065] It can be understood that under normal working conditions, the weight of the head and the weight of the tail conveyed into the cut tobacco dryer 1 are both less than the weight of the middle conveyed into the cut tobacco dryer 1.

[0066] ​Specifically, the moisture of the tobacco shreds delivered to the conveying mechanism 3 by the tobacco drying machine 1 is monitored and acquired in real time by the humidity tester 4.

[0067] S400, the secondary winnowing device 5 is controlled according to the tobacco shreds brand, the tobacco shreds type and the moisture of the tobacco shreds to perform winnowing.

[0068] Different control methods are adopted to control the secondary winnowing device 5 to perform winnowing for different tobacco shreds brands, different tobacco shreds types and different moisture of the tobacco shreds, so as to effectively improve the separation precision and separation effect of separating stems and leaves in the tobacco shreds, and the winnowing cost of the winnowing system does not need to be increased compared with the prior art.

[0069] Specifically, the specific steps of controlling the secondary winnowing device 5 to perform winnowing according to the tobacco shreds brand, the tobacco shreds type and the moisture of the tobacco shreds include:

[0070] When the tobacco shreds delivered to the tobacco drying machine 1 are the head, the secondary winnowing device 5 is controlled according to the tobacco shreds brand of the head and the moisture of the head to perform winnowing.

[0071] When the tobacco shreds delivered to the tobacco drying machine 1 are the tail, the secondary winnowing device 5 is controlled according to the tobacco shreds brand of the tail and the moisture of the tail to perform winnowing.

[0072] When the tobacco shreds delivered to the tobacco drying machine 1 are the middle, the secondary winnowing device 5 is controlled according to the tobacco shreds brand of the middle and the moisture of the middle to perform winnowing.

[0073] When the tobacco shreds delivered to the tobacco drying machine 1 are the head, the specific steps of controlling the secondary winnowing device 5 to perform winnowing according to the tobacco shreds brand of the head and the moisture of the head include:

[0074] S411, a first set moisture value is acquired from a first table according to the tobacco shreds brand and the tobacco shreds type. The tobacco shreds brand, the tobacco shreds type and the first set moisture value form the first table. Specifically, the first table is obtained by a large number of tests in advance.

[0075] It can be understood that the tobacco shreds type in the first table is the head. The first set moisture value is different for different tobacco shreds brands of the head. So that the secondary winnowing device 5 can be more accurately controlled according to the moisture of the head and the first set moisture value to perform winnowing. Thus, the separation precision and separation effect of separating stems and leaves in the head can be further improved.

[0076] S412, the secondary winnowing device 5 is controlled according to the moisture of the head and the first set moisture value to perform winnowing.

[0077] Specifically, as shown in Figure 3 the specific steps of controlling the secondary winnowing device 5 to perform winnowing according to the moisture of the head and the first set moisture value include:

[0078] S4121, determining whether the moisture of the head is greater than a first set moisture value.

[0079] Specifically, since the moisture of the head is greater than the moisture of the tobacco and the moisture of the tail, the first degree of the primary air door and the second degree of the secondary air door of the secondary air selection device 5 are determined by determining whether the moisture of the head is greater than the first set moisture value.

[0080] If the moisture of the head is greater than the first set moisture value, step S4122 is performed.

[0081] S4122, controlling the first degree of the primary air door of the secondary air selection device 5 to be a first preset degree; after a delay time, controlling the second degree of the secondary air door of the secondary air selection device 5 to be a first preset degree.

[0082] If the moisture of the head is less than or equal to the first set moisture value, step S4123 is performed.

[0083] S4123, controlling the first degree of the primary air door of the secondary air selection device 5 to be a second preset degree; after a delay time, controlling the second degree of the secondary air door of the secondary air selection device 5 to be a second preset degree.

[0084] The first preset degree is greater than the second preset degree.

[0085] It can be understood that when the moisture of the head is large, the weight of the head is relatively large, the degree of the primary air door and the degree of the secondary air door are increased, so that the air selection speed is increased. When the moisture of the head is small, the weight of the head is relatively small, the degree of the primary air door and the degree of the secondary air door are decreased, so that the air selection speed is decreased. In order to accurately improve the separation precision and separation effect of separating the stems in the head.

[0086] Specifically, the delay time is the conveying time of the head from the primary air selection to the secondary air selection. By adjusting the degree of the secondary air door after the delay time, it can be accurately determined when to adjust the degree of the secondary air door, so that energy consumption can be avoided. The delay time is an empirical value obtained from a large number of previous tests.

[0087] When the tobacco conveyed to the cut tobacco machine 1 is the tail, the specific steps of controlling the secondary air selection device 5 to air select according to the tobacco brand and the moisture of the tail include:

[0088] S421, obtaining a second set moisture value from the second table according to the tobacco brand and the tobacco type. The tobacco brand, the tobacco type and the second set moisture value form a second table. Specifically, the second table is obtained from a large number of previous tests.

[0089] It can be understood that the tobacco kind in the second table is the tail. The second set humidity value is different for the tail of different tobacco brand. So that the second winnowing device 5 can be controlled according to the humidity of the tail and the second set humidity value to winnow more accurately. So that the separation precision and separation effect of separating the stems and leaves in the tail can be further improved.

[0090] S422, controlling the second winnowing device 5 to winnow according to the humidity of the tail and the second set humidity value.

[0091] Specifically, as shown in Figure 4 the specific steps of controlling the second winnowing device 5 to winnow according to the humidity of the tail and the second set humidity value include:

[0092] S4221, judging whether the humidity of the tail is less than the second set humidity value.

[0093] Specifically, since the humidity of the tail is relatively small compared with the humidity of the head and the humidity of the tobacco, whether the first damper opening degree and the second damper opening degree of the second winnowing device 5 are adjusted is determined by judging whether the humidity of the tail is less than the second set humidity value.

[0094] If the humidity of the tail is less than the second set humidity value, step S4222 is performed.

[0095] S4222, controlling the first damper opening degree of the second winnowing device 5 to be a third preset opening degree; after a time delay, controlling the second damper opening degree of the second winnowing device 5 to be the third preset opening degree.

[0096] If the humidity of the tail is greater than or equal to the second set humidity value, step S4223 is performed.

[0097] S4223, controlling the first damper opening degree of the second winnowing device 5 to be a fourth preset opening degree; after a time delay, controlling the second damper opening degree of the second winnowing device 5 to be the fourth preset opening degree.

[0098] The fourth preset opening degree is greater than the third preset opening degree.

[0099] It can be understood that when the humidity of the tail is relatively small, the weight of the tail is relatively small, and the opening degree of the first damper and the opening degree of the second damper are adjusted to be small, so that the wind speed of winnowing is reduced. When the humidity of the tail is relatively large, the weight of the tail is relatively large, and the opening degree of the first damper and the opening degree of the second damper are adjusted to be large, so that the wind speed of winnowing is increased. So that the separation precision and separation effect of separating the stems and leaves in the tail can be accurately improved.

[0100] When the tobacco conveyed to the cut tobacco drying machine 1 is the tail, the specific steps of controlling the second winnowing device 5 to winnow according to the humidity of the tail and the second set humidity value include:

[0101] S431, obtaining a third set humidity value from the third table according to the tobacco brand and the tobacco type. The tobacco brand, the tobacco type and the third set humidity value form the third table. Specifically, the third table is obtained from a large number of previous tests.

[0102] It can be understood that the tobacco type in the third table is cut tobacco. For different cut tobacco, the third set humidity value is different. In this way, the air separation of the secondary air separation device 5 can be controlled more accurately according to the humidity of the cut tobacco and the third set humidity value. Therefore, the separation accuracy and separation effect of the cut tobacco can be further improved.

[0103] Preferably, the first table, the second table and the third table can be combined into one table.

[0104] S432, controlling the air separation of the secondary air separation device 5 according to the humidity of the cut tobacco and the third set humidity value.

[0105] Specifically, as shown in Figure 5 the specific steps of controlling the air separation of the secondary air separation device 5 according to the humidity of the cut tobacco and the third set humidity value include:

[0106] S4321, determining whether the difference between the humidity of the cut tobacco and the third set humidity value is greater than or equal to a minimum set difference value.

[0107] It can be understood that the minimum set difference value is a critical difference value. If the difference between the humidity of the cut tobacco and the third set humidity value is greater than the critical difference value, it indicates that the humidity of the cut tobacco is large, and the secondary air door opening degree of the secondary air separation device 5 needs to be adjusted so that the secondary air separation device 5 can effectively separate the cut tobacco.

[0108] It can be understood that the minimum set difference value is a critical difference value. If the difference between the humidity of the cut tobacco and the third set humidity value is greater than the critical difference value, it indicates that the humidity of the cut tobacco is large, and the secondary air door opening degree of the secondary air separation device 5 needs to be adjusted so that the secondary air separation device 5 can effectively separate the cut tobacco.

[0109] If the difference between the humidity of the cut tobacco and the third set humidity value is greater than or equal to the minimum set difference value, step S4322 is executed. That is, the humidity of the cut tobacco is large, and the secondary air door opening degree of the secondary air separation device 5 needs to be adjusted so that the secondary air separation device 5 can effectively separate the cut tobacco.

[0110] In this embodiment, the minimum set difference value is 0.2. In this way, the difference between the humidity of the cut tobacco and the third set humidity value is small, and the separation accuracy and separation effect of the cut tobacco can be further improved. The minimum set difference value is an empirical value obtained from a large number of previous tests.

[0111] S4322, keeping the primary air door opening degree of the current secondary air separation device 5 unchanged, and controlling the secondary air door opening degree of the current secondary air separation device 5 to increase by A%. Wherein A is a positive number.

[0112] Wherein, A% is an empirical value obtained from a large number of experiments in the early stage.

[0113] Specifically, in this embodiment, an example is taken with A% being 0.5%.

[0114] If the difference between the moisture in the material and the third set humidity value is less than the minimum set difference value, step S4323 is performed.

[0115] S4323, the current primary air door opening degree of the secondary air separation device 5 is kept unchanged, the current secondary air door opening degree of the secondary air separation device 5 is kept unchanged, and it is returned to judge whether the difference between the moisture in the material and the third set humidity value is greater than or equal to the minimum set difference value. That is, it is returned to perform step S4321.

[0116] At this time, it indicates that the current primary air door opening degree and the secondary air door opening degree of the secondary air separation device 5 can effectively separate the stems in the material, and there is no need to further control the primary air door opening degree and the secondary air door opening degree of the secondary air separation device 5. Then it is returned to re-judge the moisture in the material subsequently conveyed to the secondary air separation device 5. Since the amount of the material is relatively large, such setting can ensure that the separation precision and separation effect of separating the stems in the material can be effectively improved throughout the process of air separation of the stems in the material.

[0117] Specifically, after step S4322, in order to improve the separation precision and separation effect of separating the stems in the material, the following steps are further included:

[0118] S4324, judge whether the difference between the moisture in the material and the third set humidity value is greater than or equal to the first set difference value and less than the second set difference value.

[0119] Wherein, the first set difference value = n*minimum set difference value, the second set difference value = (n+1)*minimum set difference value, n is the number of times of judging whether the difference between the moisture in the material and the third set humidity value is greater than or equal to the first set difference value and less than the second set difference value.

[0120] If the difference between the moisture in the material and the third set humidity value is greater than or equal to the first set difference value and less than the second set difference value, step S4325 is performed.

[0121] S4325, the current primary air door opening degree of the secondary air separation device 5 is kept unchanged, and the current secondary air door opening degree of the secondary air separation device 5 is kept unchanged.

[0122] At this time, it indicates that the current primary air door opening degree and the secondary air door opening degree are sufficient to separate the stems in the material of the current humidity, and can also avoid causing energy consumption.

[0123] If the difference between the moisture in the material and the third set humidity value is greater than or equal to the second set difference value, step S4326 is performed.

[0124] S4326, keep the current first-stage air door opening degree of the secondary air selection device 5 unchanged, and control the second-stage air door opening degree of the secondary air selection device 5 to increase by A%.

[0125] At this time, it indicates that the current second-stage air door opening degree is small, and the second-stage air door opening degree needs to be increased to enable the separation precision and separation effect of the stems in the separated material to be further improved.

[0126] Then, it is returned to judge whether the difference between the moisture in the material and the third set moisture value is greater than or equal to the first set difference value and less than the second set difference value. That is, it is returned to execute the step S4324 to the step S4327 until the moisture in the material falls within the range of the first set difference value and the second set difference value.

[0127] If the difference between the moisture in the material and the third set moisture value is less than the first set difference value, the step S4327 is executed.

[0128] S4327, keep the current first-stage air door opening degree of the secondary air selection device 5 unchanged, and control the second-stage air door opening degree of the secondary air selection device 5 to decrease by A%.

[0129] At this time, it indicates that the current second-stage air door opening degree is large, and the second-stage air door opening degree of the secondary air selection device 5 is controlled to decrease by A% to enable the separation precision and separation effect of the stems in the separated material to be guaranteed and the energy consumption to be avoided.

[0130] Then, it is returned to judge whether the difference between the moisture in the material and the third set moisture value is greater than or equal to the first set difference value and less than the second set difference value. That is, it is returned to execute the step S4324 to the step S4327 until the moisture in the material falls within the range of the first set difference value and the second set difference value.

[0131] It can be understood that, by adjusting the second-stage air door opening degree in stages, the separation precision and separation effect of the stems in the separated material can be effectively improved while the energy consumption is avoided.

[0132] Specifically, in the process of air selection of the stems in the material, the first-stage air door opening degree is set to be always unchanged. The reason is that the moisture change of the material is relatively small and stable compared with the moisture change of the material head and the moisture change of the material tail, and therefore, in the process of air selection of the stems in the material, the separation precision and separation effect of the stems in the separated material can be improved by adjusting the second-stage air door opening degree to finely adjust the air speed. Further specifically, since the amount of tobacco conveyed to the secondary air selection is relatively small, in the process of air selection of the material, the first-stage air door opening degree is always greater than the second-stage air door opening degree.

[0133] The first, second and third set humidity values can be set to different values or the same value for the same brand of tobacco. When the first, second and third set humidity values are set to the same value for the same brand of tobacco, the first preset opening is equal to the fourth preset opening, and the second preset opening is equal to the third preset opening.

[0134] It can be understood that, for the same brand of tobacco, the head, middle and tail of the tobacco are controlled by independent control methods to control the secondary air separation device 5. For the head of the tobacco of different brands, the secondary air separation device 5 is precisely controlled according to the humidity of the head of different brands and the corresponding first set humidity value. For the tail of the tobacco of different brands, the secondary air separation device 5 is precisely controlled according to the humidity of the tail of different brands and the corresponding second set humidity value. For the middle of the tobacco of different brands, the secondary air separation device 5 is precisely controlled according to the humidity of the middle of different brands and the corresponding third set humidity value. This effectively improves the separation accuracy and separation effect of the separated stem in the head, the stem in the tail, and the stem in the middle.

[0135] Therefore, by using the air separation control method to control the air separation system to separate the stems in the tobacco, the separation accuracy and separation effect of the separated stems in the tobacco can be effectively improved, energy consumption can be avoided, and the air separation cost of the air separation system does not need to be increased compared with the prior art.

[0136] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the embodiments of the present application. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the scope of the present application. It is unnecessary and impossible to enumerate all the embodiments. Any modification, equivalent substitution and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. A method of controlling the air selection, the air selection system comprising a cut tobacco drying machine (1), a conveying mechanism (3) and a secondary air selection device (5) arranged in sequence, cut tobacco being able to flow through the cut tobacco drying machine (1), the conveying mechanism (3) and the secondary air selection device (5) in sequence, and a humidity tester (4) for monitoring the humidity of the cut tobacco being arranged directly above the conveying mechanism (3), characterized in that, The air selection control method comprises: obtaining a tobacco brand; determining a tobacco type according to the state of the cut tobacco drying machine (1); wherein the tobacco type comprises a head, a tail and a middle; real-time monitoring and obtaining the moisture of the tobacco delivered by the cut tobacco drying machine (1) to the conveying mechanism (3); controlling the secondary air selection device (5) to perform air selection according to the tobacco brand, the tobacco type and the moisture of the tobacco; The specific steps of controlling the secondary air selection device (5) to perform air selection according to the tobacco brand, the tobacco type and the moisture of the tobacco comprise: when the tobacco delivered to the cut tobacco drying machine (1) is the head, controlling the secondary air selection device (5) to perform air selection according to the tobacco brand of the head and the moisture of the head; when the tobacco delivered to the cut tobacco drying machine (1) is the tail, controlling the secondary air selection device (5) to perform air selection according to the tobacco brand of the tail and the moisture of the tail; when the tobacco delivered to the cut tobacco drying machine (1) is the middle, controlling the secondary air selection device (5) to perform air selection according to the tobacco brand of the middle and the moisture of the middle; the specific steps of controlling the secondary air selection device (5) to perform air selection according to the tobacco brand of the middle and the moisture of the middle comprise: obtaining a third set humidity value from a third table according to the tobacco brand and the tobacco type; wherein the tobacco brand, the tobacco type and the third set humidity value form the third table; determining whether the difference between the moisture of the middle and the third set humidity value is greater than or equal to a minimum set difference value; if the difference between the moisture of the middle and the third set humidity value is greater than or equal to the minimum set difference value, keeping the current primary air door opening degree of the secondary air selection device (5) unchanged and controlling the secondary air selection device (5) to increase the secondary air door opening degree by A%; wherein A is a positive number; if the difference between the moisture of the middle and the third set humidity value is less than the minimum set difference value, keeping the current primary air door opening degree of the secondary air selection device (5) unchanged, keeping the current secondary air door opening degree of the secondary air selection device (5) unchanged, and returning to determine whether the difference between the moisture of the middle and the third set humidity value is greater than or equal to the minimum set difference value; after controlling the secondary air selection device (5) to increase the secondary air door opening degree by A%, the method further comprises the following steps: determining whether the difference between the moisture of the middle and the third set humidity value is greater than or equal to a first set difference value and less than a second set difference value; wherein the first set difference value is n*the minimum set difference value, the second set difference value is (n+1)*the minimum set difference value, and n is the number of times of determining whether the difference between the moisture of the middle and the third set humidity value is greater than or equal to the first set difference value and less than the second set difference value; if the difference between the moisture of the middle and the third set humidity value is greater than or equal to the first set difference value and less than the second set difference value, keeping the current primary air door opening degree of the secondary air selection device (5) unchanged and keeping the current secondary air door opening degree of the secondary air selection device (5) unchanged; If the difference between the moisture in the material and the third set humidity value is greater than or equal to the second set difference value, the current first-stage damper opening degree of the secondary air separation device (5) is kept unchanged, and the current second-stage damper opening degree of the secondary air separation device (5) is controlled to be increased by A%; it is returned to judge whether the difference between the moisture in the material and the third set humidity value is greater than or equal to the first set difference value and less than the second set difference value; If the difference between the moisture in the material and the third set humidity value is less than the first set difference value, the current first-stage damper opening degree of the secondary air separation device (5) is kept unchanged, and the current second-stage damper opening degree of the secondary air separation device (5) is controlled to be decreased by A%; it is returned to judge whether the difference between the moisture in the material and the third set humidity value is greater than or equal to the first set difference value and less than the second set difference value; The minimum set difference value is 0.2; The specific steps of controlling the secondary air separation device (5) to perform air separation according to the moisture of the material head and the first set humidity value include: The first set humidity value is obtained from the first table according to the tobacco brand and the tobacco type; wherein the tobacco brand, the tobacco type and the first set humidity value form the first table; The specific steps of controlling the secondary air separation device (5) to perform air separation according to the moisture of the material head and the first set humidity value include: The second set humidity value is obtained from the second table according to the tobacco brand and the tobacco type; wherein the tobacco brand, the tobacco type and the second set humidity value form the second table; The specific steps of controlling the secondary air separation device (5) to perform air separation according to the moisture of the material head and the first set humidity value include: It is judged whether the moisture of the material head is greater than the first set humidity value; 2. The wind control method according to claim 1, characterized in that, If the moisture of the material head is greater than the first set humidity value, the first-stage damper opening degree of the secondary air separation device (5) is controlled to be adjusted to a first preset opening degree; after a time delay, the second-stage damper opening degree of the secondary air separation device (5) is controlled to be adjusted to a first preset opening degree; If the moisture of the material head is less than or equal to the first set humidity value, the first-stage damper opening degree of the secondary air separation device (5) is controlled to be adjusted to a second preset opening degree; after a time delay, the second-stage damper opening degree of the secondary air separation device (5) is adjusted to a second preset opening degree; The first preset opening degree is greater than the second preset opening degree. The specific steps of controlling the secondary air separation device (5) to perform air separation according to the moisture of the material head and the first set humidity value include: It is judged whether the moisture of the material head is greater than the first set humidity value; 3. The wind selection control method according to claim 1, wherein If the moisture of the material head is greater than the first set humidity value, the first-stage damper opening degree of the secondary air separation device (5) is controlled to be adjusted to a first preset opening degree; after a time delay, the second-stage damper opening degree of the secondary air separation device (5) is controlled to be adjusted to a first preset opening degree; If the moisture of the material head is less than or equal to the first set humidity value, the first-stage damper opening degree of the secondary air separation device (5) is controlled to be adjusted to a second preset opening degree; after a time delay, the second-stage damper opening degree of the secondary air separation device (5) is adjusted to a second preset opening degree; ​ If the humidity of the tail material is greater than or equal to the second set humidity value, the first-stage damper opening degree of the secondary air separation device (5) is controlled to be adjusted to a fourth preset opening degree; after a time delay, the second-stage damper opening degree of the secondary air separation device (5) is adjusted to be the fourth preset opening degree. The fourth preset opening degree is greater than the third preset opening degree.

4. The wind selection control method according to claim 1, wherein The specific step of determining the state of the cut tobacco drying machine (1) comprises determining the state of the cut tobacco drying machine (1) according to the flow of cut tobacco delivered into the cut tobacco drying machine (1).

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