A method and system for adjusting the opening degree of a winnowing machine air door and a storage medium

Abstract

The application discloses a kind of air separator damper opening degree adjusting method, air separator is used to carry out air selection to leaf tobacco after being dried by cut tobacco dryer, comprising: obtaining the flow value when leaf tobacco runs to the inlet of cut tobacco dryer;Calculate the difference value of flow value and preset flow value, recorded as first difference value;Obtain the negative pressure value in air separator when leaf tobacco runs to the inlet of air separator;Calculate the difference value of negative pressure value and preset negative pressure value, recorded as second difference value;According to first difference value and second difference value, adjust the damper opening degree of air separator.The application can accurately adjust the damper opening degree of air separator under different conditions, effectively control leaf tobacco air selection, improve the effect of leaf tobacco air selection, so that tobacco and tobacco stem can be completely separated.The application also discloses a kind of system for controlling the damper opening degree of air separator and a kind of computer readable storage medium.

Description

Technical Field

[0001] This invention relates to the field of blade processing, and in particular to a method, system and storage medium for adjusting the opening of a damper in an air classifier. Background Technology

[0002] The leaf shred air separation equipment is located downstream of the tobacco drying machine and is mainly used to screen and remove stems and twigs from the tobacco powder, thereby improving the purity of the leaf shreds. During the air separation process, the screening efficiency can be adjusted by controlling the opening of the damper in the leaf shred air separation mechanism. Currently, all cigarette manufacturers use a fixed damper opening during the tobacco processing of the same brand. When the damper opening of the leaf shred air separation mechanism is fixed, it cannot be adjusted according to changes in the incoming material flow rate, resulting in incomplete separation of tobacco shreds and stems from the tobacco powder.

[0003] To address the aforementioned issues, a method for adjusting the damper opening has been disclosed, changing the current situation where the damper opening is fixed during the cigarette manufacturing process of the same brand. This method first obtains the current flow rate of the tobacco leaves to be fed into the drying machine, then calculates the difference between the current flow rate and the preset flow rate. The damper opening of the air separator is then adjusted based on this difference. However, in practice, due to the considerable distance between the drying machine and the air separator, and the fact that the intermediate tobacco leaves must pass through the drying machine's rollers, belt conveyor, and vibrating conveyor, the actual flow rate of the tobacco leaves entering the air separator may not equal the flow rate at the drying machine's inlet. Therefore, adjusting the damper opening based on the drying machine's inlet flow rate will introduce errors, resulting in inaccurate adjustment results, unsatisfactory tobacco leaf air separation, and inability to completely separate the tobacco leaves and stems. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of inaccurate adjustment results, unsatisfactory leaf separation effect, and inability to completely separate tobacco shreds and stems caused by adjusting the damper opening of an air separator solely based on the leaf shred flow rate at the inlet of the drying machine. This invention provides a method for adjusting the damper opening of an air separator. First, the flow rate of the leaf shreds at the inlet of the drying machine is collected, and the difference between the flow rate and a preset flow rate is calculated and recorded as the first difference. Next, the negative pressure value inside the air separator at the inlet of the leaf shreds is obtained; the difference between the negative pressure value and a preset negative pressure value is calculated and recorded as the second difference. The damper opening is adjusted based on the first and second differences to effectively control the leaf shred air separation, improve the separation effect, and ensure complete separation of tobacco shreds and stems.

[0005] To address the aforementioned technical problems, embodiments of the present invention disclose a method for adjusting the damper opening of an air classifier. The air classifier is used to perform air classification on leaf filaments after they have been dried by a filament drying machine, comprising:

[0006] Obtain the flow rate value when the filaments reach the inlet of the drying machine;

[0007] Calculate the difference between the flow rate value and the preset flow rate value, and record it as the first difference;

[0008] Obtain the negative pressure value inside the air classifier when the blades reach the inlet;

[0009] Calculate the difference between the negative pressure value and the preset negative pressure value, and record it as the second difference;

[0010] Adjust the damper opening of the air separator based on the first and second differences.

[0011] By employing the above technical solution, the flow rate of the filaments is first obtained when they reach the inlet of the drying machine. Then, after a preset time, when the filaments reach the inlet of the air classifier, the negative pressure value inside the air classifier is obtained. The opening of the air classifier's damper is adjusted based on the differences between the flow rate and the preset flow rate, and the differences between the negative pressure and the preset negative pressure, respectively. This allows for a pre-judgment of the filament flow rate before adjusting the damper opening, understanding the magnitude of the difference between the filament flow rate and the preset flow rate (i.e., the first difference). This helps to grasp the severity of the current filament flow rate fluctuations and prevents the use of only the flow rate at the drying machine inlet and the preset flow rate as the sole basis for adjustment. The problem of inaccurate blade flow rate values ​​caused by adjusting the damper opening of the air classifier based on the difference is addressed by: Once the magnitude of the first difference is determined, the difference between the current negative pressure value and the preset negative pressure value inside the air classifier is determined before the blades enter the air classifier, and a second difference is calculated. The damper opening of the air classifier is then adjusted based on both the first and second differences. This prevents the problem of adjusting the damper opening solely based on the difference between the negative pressure value inside the air classifier before the blades enter and the preset negative pressure value. In such cases, the blade flow rate may have already passed through the air classifier by the time the damper opening is adjusted to the preset value, resulting in the damper adjustment having no actual effect on the instantaneous blade flow rate value.

[0012] Optionally, adjusting the damper opening of the air separator based on the first difference and the second difference includes:

[0013] Construct multiple groups of Class I threshold intervals. Each group of Class I threshold intervals includes a Class I flow threshold interval and a Class I negative pressure threshold interval, and there is no overlap between the Class I flow threshold intervals.

[0014] Determine whether the first difference falls within one of the Class I traffic threshold ranges;

[0015] If so, determine whether the second difference is located within a negative pressure threshold range corresponding to the flow threshold range of that type;

[0016] If so, keep the damper opening unchanged;

[0017] If not, then determine whether the second difference is higher than the negative pressure threshold range of that type;

[0018] If so, reduce the damper opening;

[0019] If not, increase the damper opening.

[0020] Optionally, the number of threshold interval groups is three, namely the first threshold interval group, the second threshold interval group, and the third threshold interval group.

[0021] Optionally, in the first threshold interval group, one type of flow threshold interval is (-100, 100), and one type of negative pressure threshold interval is (-5, 5);

[0022] In the second threshold interval group, one type of flow threshold interval is [100, 200], and another type of negative pressure threshold interval is [5, 15].

[0023] In the third threshold interval group, one type of flow threshold interval is [-200, -100], and another type of negative pressure threshold interval is [-15, -5].

[0024] One type of flow threshold is measured in kg / h, and the other type of negative pressure threshold is measured in Pa.

[0025] Optionally, when the first difference is within a flow threshold range in the first threshold range group and the second difference is higher than a negative pressure threshold range in the first threshold range group, the damper opening adjustment value is -0.75%; when the first difference is within a flow threshold range in the first threshold range group and the second difference is lower than a negative pressure threshold range in the first threshold range group, the damper opening adjustment value is 0.75%.

[0026] Optionally, when the first difference is within a flow threshold range in the second threshold range group and the second difference is higher than a negative pressure threshold range in the second threshold range group, the damper opening adjustment value is -1%; when the first difference is within a flow threshold range in the second threshold range group and the second difference is lower than a negative pressure threshold range in the second threshold range group, the damper opening adjustment value is 1%.

[0027] Optionally, when the first difference is within a flow threshold range in the third threshold range group and the second difference is higher than a negative pressure threshold range in the third threshold range group, the damper opening adjustment value is -1%; when the first difference is within a flow threshold range in the third threshold range group and the second difference is lower than a negative pressure threshold range in the third threshold range group, the damper opening adjustment value is 1%.

[0028] Optionally, adjusting the damper opening of the air separator based on the first difference and the second difference further includes:

[0029] Construct a set of two types of threshold intervals, which includes a type II flow threshold interval and a type II negative pressure threshold interval;

[0030] If the first difference is not within the Class I flow threshold range, then determine whether the first difference is within the Class II flow threshold range.

[0031] If so, determine whether the second difference is within the range of the second type of negative pressure threshold;

[0032] If so, keep the damper opening unchanged;

[0033] If not, then determine whether the second difference is lower than the Class II negative pressure threshold range;

[0034] If so, increase the damper opening;

[0035] If not, then call the police.

[0036] Optionally, the Class II flow threshold range is (200, 350], and the Class II negative pressure threshold range is (15, 25], wherein the unit of the Class II flow threshold is kg / h, and the unit of the Class II negative pressure threshold is Pa.

[0037] Optionally, when the first difference is within the Class II flow threshold range and the second difference is below the Class II negative pressure threshold range, the damper opening adjustment value is 0.35%.

[0038] Optionally, adjusting the damper opening of the air separator based on the first difference and the second difference further includes:

[0039] Construct three types of threshold interval groups, which include one type of flow threshold interval and one type of negative pressure threshold interval;

[0040] If the first difference is not within the Class I or Class II flow threshold range, then determine whether the first difference is within the Class III flow threshold range.

[0041] If so, determine whether the second difference is within the three-category negative pressure threshold range;

[0042] If so, keep the damper opening unchanged;

[0043] If not, then determine whether the second difference is higher than the second type of negative pressure threshold range;

[0044] If so, reduce the damper opening;

[0045] If not, then call the police.

[0046] Optionally, the three types of flow thresholds are in the range of [-350, -200), and the three types of negative pressure thresholds are in the range of [-25, -15), where the unit of the three types of flow thresholds is kg / h and the unit of the three types of negative pressure thresholds is Pa.

[0047] Optionally, when the first difference is within the Class III flow threshold range and the second difference is higher than the Class III negative pressure threshold range, the damper opening adjustment value is -0.35%.

[0048] Optionally, if the first difference is not within any of the Class I, Class II, and Class III traffic threshold intervals, an alarm is issued.

[0049] Optionally, the preset flow rate is 6050 kg / h.

[0050] Optionally, the preset negative pressure value is 75 Pa.

[0051] A system for controlling the opening of a damper in an air separator, used to perform any of the aforementioned methods, the system comprising:

[0052] The detection unit is used to detect the flow rate when the filaments reach the inlet of the drying machine and the negative pressure value inside the air classifier when the filaments reach the inlet of the air classifier.

[0053] The processing unit is used to receive the detection data sent by the detection unit, calculate the first difference and the second difference, and formulate a control strategy based on the first difference and the second difference.

[0054] The execution unit is used to receive instructions from the processing unit and adjust the opening of the damper of the air separator according to the instructions.

[0055] A computer-readable storage medium storing computer instructions that, when executed, can implement any of the methods described above. Attached Figure Description

[0056] Figure 1 This diagram shows the structure of the wire drying and air separation production line.

[0057] Figure 2 The flowchart illustrates the method for adjusting the damper opening of the air separator provided by the present invention.

[0058] Figure label:

[0059] 1. Drying machine; 11. Drying machine inlet; 12. Drying machine outlet; 2. Air classifier; 21. Air classifier inlet; 3. Conveying mechanism. Detailed Implementation

[0060] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention is presented in conjunction with preferred embodiments, this does not mean that the features of the invention are limited to these embodiments. On the contrary, the purpose of describing the invention in conjunction with embodiments is to cover other options or modifications that may be derived based on the claims of the present invention. To provide a deep understanding of the invention, many specific details will be included in the following description. The invention may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of the invention, some specific details will be omitted in the description. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0061] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0062] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product of the invention is usually placed in during use. They are only for the convenience of describing the present invention and simplifying the description, 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 limiting the present invention.

[0063] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0064] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment based on the specific circumstances.

[0065] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

[0066] refer to Figure 1The process of leaf drying and air separation is as follows: First, the leaf shreds are transported to the inlet 11 of the drying machine via the conveying mechanism 3, and then enter the drying machine 1. The drying machine 1 dries the leaf shreds to reduce the moisture content and ensure it meets the standard. Then, the leaf shreds are output from the drying machine outlet 12 and transported to the inlet 21 of the air separator via the conveying mechanism 3. They then enter the air separator 2 for air separation. Under the action of the air separator 2, stems, wet clumps, and impurities are removed, so that the tobacco shreds and stems are completely separated. After that, the leaf shreds are output from the air separator 2 and enter the subsequent process. The screening efficiency of the air separation can be adjusted by controlling the opening of the damper of the air separator 2. In this invention, the "damper opening" refers to the percentage of the current damper opening area to the maximum damper opening area.

[0067] This invention provides a method for adjusting the damper opening of an air classifier 2. The air classifier 2 is used to perform air classification on the filaments after they have been dried by a filament drying machine 1, including:

[0068] Step S1: Obtain the flow rate value when the filaments reach the inlet 11 of the drying machine;

[0069] Step S2: Calculate the difference between the flow rate value and the preset flow rate value, and record it as the first difference;

[0070] Step S3: Obtain the negative pressure value inside the air separator 2 when the blades run to the air separator inlet 21;

[0071] Step S4: Calculate the difference between the negative pressure value and the preset negative pressure value, and record it as the second difference;

[0072] Step S5: Adjust the damper opening of the air separator 2 according to the first difference and the second difference.

[0073] The method described in the above embodiment first obtains the flow rate value of the filaments when they reach the inlet 11 of the drying machine. Then, after a preset time, when the filaments reach the inlet 21 of the air classifier, it obtains the negative pressure value inside the air classifier 2. The opening of the damper in the air classifier 2 is adjusted based on the difference between the flow rate value and the preset flow rate value, and the difference between the negative pressure value and the preset negative pressure value, respectively. This allows for a pre-judgment of the filament flow rate value before adjusting the damper opening of the air classifier 2, understanding the difference between the filament flow rate value and the preset flow rate value (i.e., the magnitude of the first difference). This helps to monitor the fluctuations in the current filament flow rate and prevents the problem from being solved solely based on the flow rate value at the inlet 11 of the drying machine and the preset flow rate value. The problem of inaccurate blade flow rate value is caused by adjusting the damper opening of the air classifier 2 based on the difference in the first difference. After understanding the magnitude of the first difference, before the blades enter the air classifier 2, the difference between the current negative pressure value and the preset negative pressure value is determined, and the second difference is calculated. The damper opening of the air classifier 2 is adjusted according to the first and second differences to prevent the problem of adjusting the damper opening of the air classifier 2 based solely on the difference between the negative pressure value and the preset negative pressure value before the blades enter the air classifier 2. This would result in the blade flow rate fluctuating instantaneously having already passed through the air classifier after the damper opening is adjusted to the preset value, thus the damper adjustment has no actual effect on the instantaneous flow rate.

[0074] Optionally, adjusting the damper opening of the air separator 2 based on the first difference and the second difference includes:

[0075] Construct multiple groups of Class I threshold intervals. Each group of Class I threshold intervals includes a Class I flow threshold interval and a Class I negative pressure threshold interval, and there is no overlap between the Class I flow threshold intervals.

[0076] Determine whether the first difference falls within one of the Class I traffic threshold ranges;

[0077] If so, determine whether the second difference is located within a negative pressure threshold range corresponding to the flow threshold range of that type;

[0078] If so, keep the damper opening unchanged;

[0079] If not, then determine whether the second difference is higher than the negative pressure threshold range of that type;

[0080] If so, reduce the damper opening;

[0081] If not, increase the damper opening.

[0082] Optionally, the number of threshold interval groups is three, namely the first threshold interval group, the second threshold interval group, and the third threshold interval group.

[0083] Optionally, in the first threshold interval group, one type of flow threshold interval is (-100, 100), and one type of negative pressure threshold interval is (-5, 5);

[0084] In the second threshold interval group, one type of flow threshold interval is [100, 200], and another type of negative pressure threshold interval is [5, 15].

[0085] In the third threshold interval group, one type of flow threshold interval is [-200, -100], and another type of negative pressure threshold interval is [-15, -5].

[0086] One type of flow threshold is measured in kg / h, and the other type of negative pressure threshold is measured in Pa.

[0087] Optionally, when the first difference is within a flow threshold interval of the first threshold interval group and the second difference is higher than a negative pressure threshold interval of the first threshold interval group, the damper opening adjustment value is -0.75%, where "adjustment value" refers to the change in damper opening based on the preset damper opening. When the adjustment value is 0, it means keeping the preset damper opening unchanged; when the adjustment value is negative, it means the damper opening needs to be reduced based on the preset damper opening; when the adjustment value is positive, it means the damper opening needs to be increased based on the preset damper opening. When the first difference is within a flow threshold interval of the first threshold interval group and the second difference is lower than a negative pressure threshold interval of the first threshold interval group, the damper opening adjustment value is 0.75%.

[0088] Optionally, when the first difference is within a flow threshold range in the second threshold range group and the second difference is higher than a negative pressure threshold range in the second threshold range group, the damper opening adjustment value is -1%; when the first difference is within a flow threshold range in the second threshold range group and the second difference is lower than a negative pressure threshold range in the second threshold range group, the damper opening adjustment value is 1%.

[0089] Optionally, when the first difference is within a flow threshold range in the third threshold range group and the second difference is higher than a negative pressure threshold range in the third threshold range group, the damper opening adjustment value is -1%; when the first difference is within a flow threshold range in the third threshold range group and the second difference is lower than a negative pressure threshold range in the third threshold range group, the damper opening adjustment value is 1%.

[0090] Using the above technical solution, based on the process requirements of leaf drying and air separation, the fluctuation of leaf flow rate within ±200 kg / h and the fluctuation of negative pressure within air separator 2 within ±15 Pa are classified into a first threshold range. This first threshold range is further subdivided into a first threshold range, a second threshold range, and a third threshold range. Specific adjustment methods for the damper opening in the first, second, and third threshold ranges are set for each range. When fluctuations in flow rate or negative pressure occur during leaf drying and air separation, the damper opening can be precisely adjusted according to the above classification to ensure the effectiveness of air separation.

[0091] Optionally, adjusting the damper opening of the air separator based on the first difference and the second difference further includes:

[0092] Construct a set of two types of threshold intervals, which includes a type II flow threshold interval and a type II negative pressure threshold interval;

[0093] If the first difference is not within the Class I flow threshold range, then determine whether the first difference is within the Class II flow threshold range.

[0094] If so, determine whether the second difference is within the range of the second type of negative pressure threshold;

[0095] If so, keep the damper opening unchanged;

[0096] If not, then determine whether the second difference is lower than the Class II negative pressure threshold range;

[0097] If so, increase the damper opening;

[0098] If not, an alarm will be triggered. In actual production, according to process requirements, the maximum allowable fluctuation range of the blade flow rate at the inlet 11 of the drying machine is ±350 kg / h, and the maximum allowable fluctuation range of the negative pressure at the inlet 21 of the air classifier is ±25 Pa. When these ranges are exceeded, it is considered an abnormal situation in production, which may be caused by a malfunction of some equipment. Therefore, in this case, an alarm will be triggered to remind staff to come and inspect the equipment.

[0099] Optionally, the Class II flow threshold range is (200, 350], and the Class II negative pressure threshold range is (15, 25).

[0100] Optionally, when the first difference is within the Class II flow threshold range and the second difference is below the Class II negative pressure threshold range, the damper opening adjustment value is 0.35%.

[0101] Using the above technical solution, similarly, according to the process requirements of leaf drying and air separation, the fluctuation of leaf flow rate within the range of 200-350 kg / h and the fluctuation of negative pressure within the air separator 2 within the range of 15-25 Pa are classified as the second-class threshold range to distinguish it from the first-class threshold range. A specific adjustment method for the damper opening in the second-class threshold range is also set. When the fluctuation of flow rate and negative pressure in leaf drying and air separation is the same as that in the second-class threshold range, the damper opening can be precisely adjusted according to the specific adjustment method for the second-class threshold range to ensure the effect of air separation.

[0102] Optionally, adjusting the damper opening of the air separator based on the first difference and the second difference further includes:

[0103] Construct three types of threshold interval groups, which include one type of flow threshold interval and one type of negative pressure threshold interval;

[0104] If the first difference is not within the Class I or Class II flow threshold range, then determine whether the first difference is within the Class III flow threshold range.

[0105] If so, determine whether the second difference is within the three-category negative pressure threshold range;

[0106] If so, keep the damper opening unchanged;

[0107] If not, then determine whether the second difference is higher than the second type of negative pressure threshold range;

[0108] If so, reduce the damper opening;

[0109] If not, then call the police.

[0110] Optionally, the threshold range for the three types of flow rates is [-350, -200), and the threshold range for the three types of negative pressure is [-25, -15].

[0111] Optionally, when the first difference is within the Class III flow threshold range and the second difference is higher than the Class III negative pressure threshold range, the damper opening adjustment value is -0.35%.

[0112] Similarly, based on the process requirements of leaf drying and air separation, the fluctuations in leaf flow rate within the range of -350 to 200 kg / h and the fluctuations in negative pressure within the air separator 2 within the range of -15 to 25 Pa are categorized into three threshold ranges. This distinguishes between the first and second threshold ranges. Specific adjustment methods for the damper opening in each of the three threshold ranges are established. When the flow rate and negative pressure fluctuations in leaf drying and air separation are the same as those in the three threshold ranges, the damper opening can be precisely adjusted according to the specific adjustment methods for each of the three threshold ranges, thereby improving the air separation effect.

[0113] Optionally, if the first difference is not within any of the Class I, Class II, and Class III flow threshold ranges, an alarm is issued. That is, when the blade flow rate at the inlet 11 of the drying machine exceeds the allowable flow fluctuation value of ±350kg / h of the drying air classification production line, based on actual operating experience, it may be that the conveying mechanism 3 is malfunctioning. Therefore, an alarm is issued at this time to remind the staff to come and inspect it.

[0114] In some embodiments, a drying machine 1 is used to dry the leaf filaments to obtain dried leaf filaments with a specific moisture content, and the dried leaf filaments are then fed into an air classifier 2 for air classification. For example, when the leaf filaments processed by the drying and air classification production line are Huangguoshu (Changzheng) brand leaf filaments, the preset flow rate S0 of the leaf filaments at the inlet of the drying machine is 6050 kg / h, the preset negative pressure T0 in the air classifier 2 is 75 Pa, and the specific control method for the opening of the damper of the air classifier 2 is as follows:

[0115] When the blade flow rate at the inlet of the drying machine is S1 = S0 = 6050 kg / h, and the blades reach the inlet 21 of the air classifier, and the negative pressure value inside the air classifier 2 is T1 = T0 = 75 Pa, the damper opening of the air classifier 2 is kept constant at P1 = P0 = 57%. Here, S0 is the preset blade flow rate at the inlet of the drying machine, T0 is the preset negative pressure value inside the air classifier 2 when the blades reach the inlet 21 of the air classifier, and P0 is the preset damper opening of the air classifier.

[0116] The difference between the flow rate of the filaments when they reach the inlet 11 of the drying machine and the preset flow rate is the first difference, denoted as a; the difference between the negative pressure value inside the air classifier 2 when the filaments reach the inlet 21 of the air classifier and the preset negative pressure value is the second difference, denoted as b; the adjustment value of the damper opening of the air classifier 2 is denoted as e.

[0117] At the inlet 11 of the drying machine, the blade flow rate is S1 = S0 + a. When the blade reaches the inlet 21 of the air classifier, the negative pressure inside the air classifier is T1 = T0 + b. When the blade reaches the inlet 21 of the air classifier, the damper opening of the air classifier is adjusted to P1 = P0 + e, where:

[0118] When -100 < a < 100 and -5 < b < 5, e is 0;

[0119] When -100 < a < 100 and b > 5, e is -0.75%;

[0120] When -100 < a < 100 and b < -5, e is 0.75%;

[0121] When 100≤a≤200 and 5≤b≤15, e is 0;

[0122] When 100≤a≤200 and b>15, e is -1%;

[0123] When 100≤a≤200 and b<5, e is 1%;

[0124] When -200≤a≤-100 and -15≤b≤-5, e is 0;

[0125] When 100≤a≤200 and b>-5, e is -1%;

[0126] When 100≤a≤200 and b<-15, e is 1%;

[0127] When 200 < a ≤ 350 and 15 < b ≤ 25, e is 0;

[0128] When 200 < a ≤ 350 and b < 15, e is 0.35%;

[0129] An alarm is triggered when 200 < a ≤ 350 and b > 25.

[0130] When -350≤a<-200, -25≤b<-15, e is 0;

[0131] When -350 ≤ a < -200 and b > -15, e is -0.35%.

[0132] An alarm will sound when -350 ≤ a < -200 and b < -25.

[0133] For example, when the flow rate of the blades at the inlet 11 of the drying machine is 6150 kg / h, i.e., a = 100, if the negative pressure inside the air classifier 2 is 91 Pa when the blades reach the inlet 21 of the air classifier, i.e., b = 16, then the damper opening adjustment value e of the air classifier is -1%. That is, based on the preset damper opening P0 = 57% of the air classifier 2, the damper opening of the air classifier 2 is reduced by 1%, so that the damper opening P1 of the air classifier is 56%.

[0134] For example, when the flow rate of the blades at the inlet 11 of the drying machine is 5830 kg / h, i.e., a = -220, if the negative pressure inside the air classifier 2 is 59 Pa when the blades reach the inlet 21 of the air classifier, i.e., b = -16, then the damper opening adjustment value e of the air classifier is -0.35%. That is, based on the preset damper opening P0 = 57% of the air classifier 2, the damper opening of the air classifier 2 is reduced by 0.35%, so that the damper opening P1 of the air classifier is 56.75%.

[0135] For example, when the flow rate of the blades at the inlet 11 of the drying machine is 5830 kg / h, i.e., a = -220, if the blades reach the inlet 21 of the air classifier and the negative pressure inside the air classifier 2 is 45 Pa, i.e., b = -30, which exceeds the allowable negative pressure fluctuation range inside the air classifier 2, an alarm will be triggered to remind staff to come to the site for inspection and maintenance.

[0136] The method for adjusting the damper opening of the air separator provided by this invention adjusts the damper opening based on the difference between the flow rate of the tobacco leaves at the inlet of the drying machine and a preset flow rate, and the difference between the negative pressure value inside the air separator at the inlet of the air separator and a preset negative pressure value. Specific adjustment methods for the damper opening are formulated based on the fluctuation range of the tobacco leaf flow rate and the fluctuation range of the negative pressure value inside the air separator. This solves the problems of inaccurate adjustment results, unsatisfactory tobacco leaf air separation effect, and inability to completely separate tobacco leaves and stems caused by adjusting the damper opening solely based on the tobacco leaf flow rate at the inlet of the drying machine. It improves the effect of tobacco leaf air separation, enabling complete separation of tobacco leaves and stems.

[0137] The present invention also discloses a system for controlling the opening of the damper of the air separator 2, which is used to perform the following processing:

[0138] Step S1: Obtain the flow rate value when the filaments reach the inlet 11 of the drying machine;

[0139] Step S2: Calculate the difference between the flow rate value and the preset flow rate value, and record it as the first difference;

[0140] Step S3: Obtain the negative pressure value inside the air separator 2 when the blades run to the air separator inlet 21;

[0141] Step S4: Calculate the difference between the negative pressure value and the preset negative pressure value, and record it as the second difference;

[0142] Step S5: Adjust the damper opening of the air separator 2 according to the first difference and the second difference.

[0143] The aforementioned system includes:

[0144] The detection unit is used to detect the flow rate when the filaments run to the inlet 11 of the drying machine and the negative pressure value inside the air separator 2 when the filaments run to the inlet 21 of the air separator;

[0145] The processing unit is used to receive the detection data sent by the detection unit, calculate the first difference and the second difference, and formulate a control strategy based on the first difference and the second difference.

[0146] The execution unit is used to receive instructions from the processing unit and adjust the damper opening of the air separator 2 according to the instructions.

[0147] Embodiments of the present invention also disclose a computer-readable storage medium storing computer instructions, which, when executed, perform the following processing:

[0148] Step S1: Obtain the flow rate value when the filaments reach the inlet 11 of the drying machine;

[0149] Step S2: Calculate the difference between the flow rate value and the preset flow rate value, and record it as the first difference;

[0150] Step S3: Obtain the negative pressure value inside the air separator 2 when the blades run to the air separator inlet 21;

[0151] Step S4: Calculate the difference between the negative pressure value and the preset negative pressure value, and record it as the second difference;

[0152] Step S5: Adjust the damper opening of the air separator 2 according to the first difference and the second difference.

[0153] When the computer instruction is executed by the processing unit, it implements each process of the above-described embodiment of the method for adjusting the damper opening of the air separator 2, and achieves the same technical effect. To avoid repetition, the detailed process will not be described again here. The computer storage medium mentioned includes, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0154] While the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the invention to these descriptions. Various changes in form and detail can be made by those skilled in the art, including several simple deductions or substitutions, without departing from the spirit and scope of the invention.

Claims

1. A method for adjusting the damper opening of an air classifier, wherein the air classifier is used for air classifying leaf filaments after they have been dried by a filament drying machine, characterized in that... include: Obtain the flow rate value of the filaments when they reach the inlet of the drying machine; Calculate the difference between the flow rate value and the preset flow rate value, and record it as the first difference; Obtain the negative pressure value inside the air separator when the leaf filaments reach the inlet of the air separator; Calculate the difference between the negative pressure value and the preset negative pressure value, and record it as the second difference; The damper opening of the air separator is adjusted according to the first difference and the second difference; The step of adjusting the damper opening of the air separator based on the first difference and the second difference includes: Multiple groups of first-class threshold intervals are constructed. Each group of first-class threshold intervals includes a first-class flow threshold interval and a first-class negative pressure threshold interval, and there is no overlap between the first-class flow threshold intervals. Determine whether the first difference is within one of the traffic threshold intervals of the first type; If so, determine whether the second difference is located within the negative pressure threshold range corresponding to the aforementioned flow rate threshold range; If so, then keep the damper opening unchanged; If not, then determine whether the second difference is higher than the aforementioned negative pressure threshold range; If so, reduce the opening of the damper; If not, increase the opening of the damper.

2. The method for adjusting the damper opening of an air separator as described in claim 1, characterized in that, The number of threshold interval groups is three, namely the first threshold interval group, the second threshold interval group, and the third threshold interval group.

3. The method for adjusting the damper opening of an air separator as described in claim 2, characterized in that: In the first threshold interval group, the type of flow threshold interval is (-100, 100), and the type of negative pressure threshold interval is (-5, 5). In the second threshold interval group, the first type of flow threshold interval is [100, 200], and the first type of negative pressure threshold interval is [5, 15]. In the third threshold interval group, the first type of flow threshold interval is [-200, -100], and the first type of negative pressure threshold interval is [-15, -5]. One type of flow threshold is measured in kg / h, and the other type of negative pressure threshold is measured in Pa.

4. The method for adjusting the damper opening of an air separator as described in claim 3, characterized in that: When the first difference is within the first type of flow threshold interval in the first threshold interval group, and the second difference is higher than the first type of negative pressure threshold interval in the first threshold interval group, the adjustment value of the damper opening is -0.75%; when the first difference is within the first type of flow threshold interval in the first threshold interval group, and the second difference is lower than the first type of negative pressure threshold interval in the first threshold interval group, the adjustment value of the damper opening is 0.75%.

5. The method for adjusting the damper opening of an air separator as described in claim 3, characterized in that: When the first difference is within the flow threshold range of the second threshold range group and the second difference is higher than the negative pressure threshold range of the second threshold range group, the damper opening adjustment value is -1%; when the first difference is within the flow threshold range of the second threshold range group and the second difference is lower than the negative pressure threshold range of the second threshold range group, the damper opening adjustment value is 1%.

6. The method for adjusting the damper opening of an air separator as described in claim 3, characterized in that: When the first difference is within the first type of flow threshold interval in the third threshold interval group, and the second difference is higher than the first type of negative pressure threshold interval in the third threshold interval group, the adjustment value of the damper opening is -1%; when the first difference is within the first type of flow threshold interval in the third threshold interval group, and the second difference is lower than the first type of negative pressure threshold interval in the third threshold interval group, the adjustment value of the damper opening is 1%.

7. The method for adjusting the damper opening of an air separator as described in claim 1, characterized in that, The step of adjusting the damper opening of the air separator based on the first difference and the second difference further includes: Construct a set of two types of threshold intervals, which includes a set of two types of flow threshold intervals and a set of two types of negative pressure threshold intervals; If the first difference is not within the first type of traffic threshold range, then determine whether the first difference is within the second type of traffic threshold range; If so, determine whether the second difference is within the range of the second type of negative pressure threshold; If so, then keep the damper opening unchanged; If not, then determine whether the second difference is lower than the second type of negative pressure threshold range; If so, increase the opening of the damper; If not, then call the police.

8. The method for adjusting the damper opening of an air separator as described in claim 7, characterized in that, The Class II flow threshold range is (200, 350], and the Class II negative pressure threshold range is (15, 25], wherein the unit of the Class II flow threshold is kg / h, and the unit of the Class II negative pressure threshold is Pa.

9. The method for adjusting the damper opening of an air separator as described in claim 8, characterized in that, When the first difference is within the Class II flow threshold range and the second difference is lower than the Class II negative pressure threshold range, the adjustment value of the damper opening is 0.35%.

10. The method for adjusting the damper opening of an air separator as described in claim 7, characterized in that, The step of adjusting the damper opening of the air separator based on the first difference and the second difference further includes: Construct three types of threshold interval groups, which include a three-type flow threshold interval and a three-type negative pressure threshold interval; If the first difference is not within the first type of traffic threshold range and the second type of traffic threshold range, then determine whether the first difference is within the third type of traffic threshold range; If so, determine whether the second difference is within the range of the three types of negative pressure thresholds; If so, then keep the damper opening unchanged; If not, then determine whether the second difference is higher than the second type of negative pressure threshold range; If so, reduce the opening of the damper; If not, then call the police.

11. The method for adjusting the damper opening of an air separator as described in claim 10, characterized in that: The three types of flow threshold ranges are [-350, -200), and the three types of negative pressure threshold ranges are [-25, -15). The units of the three types of flow thresholds are kg / h, and the units of the three types of negative pressure thresholds are Pa.

12. The method for adjusting the damper opening of an air separator as described in claim 11, characterized in that: When the first difference is within the three types of flow threshold range and the second difference is higher than the three types of negative pressure threshold range, the adjustment value of the damper opening is -0.35%.

13. The method for adjusting the damper opening of an air separator as described in claim 11, characterized in that, If the first difference is not located within any of the Class I, Class II, and Class III traffic threshold intervals, an alarm will be issued.

14. The method for adjusting the damper opening of an air separator as described in any one of claims 1 to 13, characterized in that, The preset flow rate is 6050 kg / h.

15. The method for adjusting the damper opening of an air separator as described in any one of claims 1 to 13, characterized in that, The preset negative pressure value is 75 Pa.

16. A system for controlling the opening of a damper in an air separator, for performing operations to implement the method as described in any one of claims 1-13, the system comprising: The detection unit is used to detect the flow rate when the filaments reach the inlet of the drying machine and the negative pressure value inside the air separator when the filaments reach the inlet of the air separator. The processing unit is used to receive the detection data sent by the detection unit, calculate the first difference and the second difference, and formulate a control strategy based on the first difference and the second difference; An execution unit is used to receive instructions from the processing unit and adjust the damper opening of the air separator according to the instructions.

17. A computer-readable storage medium storing computer instructions that, when executed, enable the implementation of the method as described in any one of claims 1-13.

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