A system and method for stabilizing loose moisture reconditioned outlet moisture
By installing moisture meters at the inlet and outlet of the loosening and rehumidifying machine, and combining real-time monitoring and adjustment by the control unit, the water addition is sorted according to the difference in tobacco leaf moisture content. This solves the problem of large fluctuations in moisture content at the outlet of the loosening and rehumidifying machine, achieves moisture stability and consistency of water addition, and improves the quality control of the cigarette making process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CHINA TOBACCO SHANDONG IND
- Filing Date
- 2026-03-12
- Publication Date
- 2026-05-29
AI Technical Summary
The moisture content at the outlet of the re-humidification machine for loose tobacco sheets in cigarette factories fluctuates significantly, and existing control methods cannot reliably control it, causing the moisture content to exceed the design value range and affecting product quality.
Moisture meters are installed at the inlet and outlet of the loosening and rehumidifying machine. The water addition is monitored and adjusted in real time by the control unit. Water is added in order of high to low according to the difference in moisture content of the tobacco leaves. When a moisture deviation is detected, the water addition is automatically adjusted to ensure stable moisture content at the outlet.
It achieved stability of the moisture content at the outlet of loose rehydrated products and consistency of water addition, reduced the moisture fluctuation range from 1.8% to 1.4%, met the process standard requirements, and improved the stability of product quality.
Smart Images
Figure CN122096451A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of cigarette manufacturing technology, and in particular to a system and method for stabilizing the moisture content of loose, rehydrated cigarettes at the outlet. Background Technology
[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.
[0003] Currently, the moisture content at the outlet of the re-humidification machine in the loosening process of cigarette sheet processing in cigarette factories fluctuates significantly. Although a re-humidification mode combining automatic control and manual intervention is adopted, the varying grades of the tobacco sheets entering the re-humidification machine (different shades of tobacco sheet color) and the large fluctuations in the moisture content of the incoming materials result in a large fluctuation (±1.8%) at the outlet, exceeding the design fluctuation range of ±1.5%. In actual production, a single grade of tobacco sheet is processed in 1 or 2 packs, and the time for the cut tobacco sheets to pass through the re-humidification machine is 2-4 minutes. When the control unit detects the exit... When the moisture content of the tobacco sheet is lower than the design value, the humidification system automatically adds more water. However, after 2-4 minutes, if the tobacco sheet of a certain grade is dark in color and has a high moisture content when it is supplied, more water is added in the loosening and rehumidification machine. In other words, the water addition to the tobacco sheet is not flexible enough, and the control is simply based on time. This can easily cause the actual moisture content at the loosening and rehumidification outlet to be higher than the design value ±1.8%, which cannot meet the moisture content (design value ±1.5%) design requirement and cannot stabilize the moisture content of the loosening and rehumidification outlet tobacco sheet. Summary of the Invention
[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a system for stabilizing the moisture content at the outlet of loosely rehydrated cigarettes. The tobacco sheets are arranged sequentially and enter the loosely rehydrated system, with water added to the tobacco sheets in descending order of moisture content, ensuring consistency in the amount of water added to cigarettes of the same brand and stability of the outlet moisture content.
[0005] To achieve the above objectives, the present invention is implemented through the following technical solution: A system for stabilizing the moisture content at the outlet of a loose rehumidification machine includes an inlet moisture meter installed at the inlet side of the loose rehumidification machine to obtain the average moisture content of the tobacco sheets after slicing, and an outlet moisture meter installed at the outlet side of the loose rehumidification machine to obtain the average moisture content at the outlet of the loose rehumidification machine. The inlet and outlet moisture meters are respectively connected to a control unit, which is connected to a water supply unit of the loose rehumidification machine. The control unit obtains the average water supply amount for the loose rehumidification process, i.e., the water supply amount of the water supply unit, based on the designed moisture content at the outlet of the loose rehumidification machine, the average moisture content of the tobacco sheets after slicing, the processing quality per unit time of the loose rehumidification machine, and the amount of steam humidification water in the loose rehumidification machine. The control unit adjusts the average water supply amount for the next batch of tobacco packs in a timely manner based on the average moisture content at the outlet of the loose rehumidification machine of the previous batch of tobacco packs.
[0006] As described above, in a system for stabilizing the outlet moisture content of a loose rehumidifier, the inlet moisture meter is installed at the inlet of the loose rehumidifier via a first conveyor or an inlet vibrating conveyor, and the outlet moisture meter is installed at the outlet vibrating conveyor or a second conveyor of the loose rehumidifier. The average water addition Q in the loosening and rehydration process is based on [(design value of moisture content at the outlet of loosening and rehydration - average moisture content of the raw tobacco sheets after slicing x)]. The processing capacity per unit time of the loosening and rehumidifying machine is obtained by measuring the steam humidification water volume (z) in the loosening and rehumidifying machine (kg / h).
[0007] As described above, a system for stabilizing the moisture content of loosely packed tobacco sheets at the outlet involves sequentially adding water to the tobacco sheets from high to low moisture levels. The control unit stores the average water addition amount for each grade of tobacco sheet in the loosening and rehydration process and sets a water addition increment / decrease coefficient. Specifically, the initial water addition amount for the first pack of tobacco sheets is Q1 = (average water addition amount Q in the loosening and rehydration process + water addition increment / decrease coefficient). The processing quality per unit time of the loosening and rehumidifying machine), the process time of the loosening and rehumidifying machine is t minutes, after t minutes the first set value is automatically reduced, and the water addition is (Q1 - water addition increase / decrease coefficient). Processing capacity per unit time of the loose rehumidifier / 60 Processing time) kg / h, and so on. After 1 hour, the water addition is automatically reduced to Q kg / h. The water addition for the last pack of tobacco sheets is (Q - water addition increase / decrease coefficient). The processing mass per unit time of the loosening and rehumidifying machine is kg / h, and the average water addition of the entire batch of tobacco sheets is Q kg / h; The magnitude of the water addition increase / decrease coefficient is directly proportional to the processing quality per unit time of the loosening and rehumidifying machine.
[0008] As described above, in a system for stabilizing the moisture content of loose, rehydrated tobacco leaves at the outlet, the control unit is also connected to a scanning mechanism at a third conveyor located at the inlet side of the slicer. If the control unit detects through the scanning mechanism that adjacent n packs of tobacco leaves are of the same grade, during the subsequent nt minutes of water addition, the water addition amount is automatically reduced to {(Q1 - water addition increase / decrease coefficient)}. Processing capacity per unit time of the loose rehumidifier / 60 it) + ... + (Q1 - coefficient for increase or decrease in water volume) Processing capacity per unit time of the loose rehumidifier / 60 nt)} / n kg / h, where i is the i-th pack of tobacco sheets entering the loosening and rehumidification machine.
[0009] As described above, in a system for stabilizing the moisture content at the outlet of loosely packed tobacco sheets, when the control unit detects that the average moisture content at the outlet is lower than the designed moisture content by a first difference Δx, the control unit controls the water supply unit to automatically replenish the average water supply amount in the loosening and rehydration process. The control unit then controls the water supply unit to adjust the average water supply amount Q for the next batch of tobacco sheets. x = (Average water addition during the loosening and rehydration process Q + Δx) (Based on the processing quality per unit time of the loosening and rehumidifying machine), the initial value Q of the water addition for the next batch of tobacco sheets should be adjusted accordingly. x1 = (Q) x +Water addition coefficient The processing quality per unit time of the loose rehumidifier.
[0010] As described above, in a system for stabilizing the moisture content at the outlet of loose, rehydrated tobacco sheets, when the control unit detects that the average moisture content at the outlet is higher than the designed moisture content by a second difference Δy, the control unit controls the water supply unit to adjust the average moisture content added to the next batch of tobacco sheets to Q. y =(Q-△y The processing capacity per unit time of the loosening and rehumidifying machine), adjust the initial water addition value accordingly to Q. y1 = (Q) y +Water addition coefficient The processing capacity per unit time of the loose rehumidifier), automatically reduced after t minutes (Q). y1 -Water addition increase / decrease coefficient Processing capacity per unit time of the loose rehumidifier / 60 Process time) kg / h, and so on.
[0011] As described above, in a system for stabilizing the moisture content at the outlet of loosely moistened tobacco, when the control unit detects that the average moisture content at the outlet of loosely moistened tobacco is lower than the allowable tolerance of the design value, the control unit determines the water addition increase / decrease coefficient based on the design value of the moisture content at the outlet of loosely moistened tobacco, the average moisture content at the outlet of loosely moistened tobacco, and the difference between the moisture content values. This determines the average water addition value for the next batch of tobacco sheets and makes up for the water addition difference. The moisture difference is obtained based on experimental data.
[0012] As described above, in a system for stabilizing the moisture content at the outlet of loosely moistened tobacco, when the control unit detects that the average moisture content at the outlet exceeds the allowable tolerance of the designed moisture content, the control unit determines the water addition increase / decrease coefficient based on the difference between the average moisture content at the outlet, the designed moisture content, and the moisture difference, and then determines the average water addition amount for the next batch of tobacco sheets to make up the water addition difference, with the moisture difference being 0.2%.
[0013] Secondly, the present invention also provides a method for stabilizing the moisture content of loose, rehydrated outlets, employing the aforementioned system for stabilizing the moisture content of loose, rehydrated outlets, comprising the following: An inlet moisture meter is installed on the inlet side of the loosening and rehumidifying machine, and an outlet moisture meter is installed on the outlet side of the loosening and rehumidifying machine to obtain the average outlet moisture value of the loosening and rehumidifying machine. The tobacco leaf bales are sorted from low to high according to the difference in moisture content between the inlet and outlet, and then enter the loosening and rehumidification machine in sequence; The control unit stores the average water addition amount for the loosening and rehydration process corresponding to various brands of tobacco sheets, and sets a water addition increment / decrease coefficient. That is, the initial water addition amount for the first pack of tobacco sheets is Q1 = (average water addition amount Q for the loosening and rehydration process + water addition increment / decrease coefficient). The processing quality per unit time of the loosening and rehumidifying machine), the process time of the loosening and rehumidifying machine is t minutes, after t minutes the first set value is automatically reduced, and the water addition is (Q1 - water addition increase / decrease coefficient). Processing capacity per unit time of the loose rehumidifier / 60 Processing time) kg / h, and so on. After 1 hour, the water addition is automatically reduced to Q kg / h. The water addition for the last pack of tobacco sheets is (Q - water addition increase / decrease coefficient). The processing mass per unit time of the loosening and rehumidifying machine is kg / h, and the average water addition of the entire batch of tobacco sheets is Q kg / h.
[0014] The method for stabilizing the moisture content of loose, rehydrated outlets, as described above, also includes the following: When the control unit detects that the average moisture content at the loose re-humidification outlet is lower than the designed moisture content at the loose re-humidification outlet by a first difference Δx, the control unit controls the water supply unit to automatically replenish the average water supply amount in the loose re-humidification process. The control unit then controls the water supply unit to adjust the average water supply amount Q for the next batch of tobacco sheets. x = (Average water addition during the loosening and rehydration process Q + Δx) (Based on the processing quality per unit time of the loosening and rehumidifying machine), the initial value Q of the water addition for the next batch of tobacco sheets should be adjusted accordingly. x1 =(Q x +Water addition coefficient (Processing quality per unit time of the loose rehumidifier) When the control unit detects that the average moisture content at the loose re-moistening outlet is higher than the designed moisture content at the loose re-moistening outlet by a second difference Δy, the control unit controls the water addition unit to adjust the average water addition amount for the next batch of tobacco sheets to Q. y =(Q-△y The processing capacity per unit time of the loosening and rehumidifying machine), adjust the initial water addition value accordingly to Q. y1 =(Q y +Water addition coefficient The processing quality per unit time of the loose rehumidifier.
[0015] The beneficial effects of the present invention are as follows: 1) The system provided by the present invention is equipped with an inlet moisture meter and an outlet moisture meter on the inlet and outlet sides of the loosening and rehumidifying machine, respectively. The control unit adjusts the water addition amount of the water addition unit according to the data collected by the inlet moisture meter and the outlet moisture meter. The control unit also adjusts the water addition amount of the next batch of tobacco packs in a timely manner according to the average moisture content of the loosening and rehumidifying outlet of the previous batch of tobacco packs, so as to realize the online adjustment of the water addition amount of the water addition unit and stabilize the moisture content of the loosening and rehumidifying tobacco sheets at the outlet.
[0016] 2) This invention adds water to the loose rehydrated tobacco sheets in descending order of water content to ensure the stability of the moisture content of the tobacco sheets after loose rehydration and drying. When a difference is detected between the average moisture content at the outlet of the loose rehydration of the previous batch of tobacco packs and the designed moisture content at the outlet of loose rehydration, the control unit can adjust the amount of water added for loose rehydration in a timely manner to ensure the stability of the outlet moisture content between batches of materials.
[0017] 3) This invention, through the setting of the control unit, adopts an automatic control rehydration mode, adding water to the loose rehydration tobacco sheets in descending order of water content, ensuring the consistency of water addition for the same brand of cigarettes and the stability of the outlet moisture content; when the control unit detects that the average outlet moisture content of the loose rehydration tobacco sheets is lower than the design tolerance or exceeds the design tolerance, the water addition increase / decrease coefficient is re-determined, thereby determining the average water addition content for the next batch of tobacco sheets, thus solving the problems of manual intervention and large fluctuations in the outlet moisture content of the loose rehydration tobacco sheets.
[0018] 4) The method of this invention arranges the tobacco sheets into loose rehydration from low to high according to the difference in moisture content between the inlet and outlet of different grades of tobacco sheets, and adds water to the loose rehydration tobacco sheets in order from high to low, so as to ensure the consistency of water addition and the stability of the outlet moisture content of the same brand of cigarettes. After the application of the results, the actual allowable value of the outlet moisture content of loose rehydration is reduced from 1.8% to 1.4%, which meets the process standard moisture design requirements (±1.5%), and effectively improves the stability of product process quality. Attached Figure Description
[0019] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.
[0020] Figure 1 This is a process flow diagram of a system for stabilizing the moisture content of loose, rehydrated outlets according to one or more embodiments of the present invention.
[0021] Figure 2 This is a plan view of a system for stabilizing the moisture content of loose, rehydrated outlets according to one or more embodiments of the present invention.
[0022] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.
[0023] Among them: 1. Smoked sheet package, 2. Roller conveyor, 3. Slicer, 4. First conveyor, 5. Inlet moisture meter, 6. Measuring scale, 7. Inlet vibrating conveyor, 8. Loosening and rehumidifying machine, 9. Outlet vibrating conveyor, 10. Outlet moisture meter, 11. Second conveyor, 12. Control unit. Detailed Implementation
[0024] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.
[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. As described in the background section, the existing technology has a problem with poor flexibility in controlling the water addition of tobacco sheets. In order to solve the above-mentioned technical problems, the present invention proposes a system for stabilizing the moisture content of loose rehydrated tobacco sheets at the outlet.
[0026] Example 1 In a typical embodiment of the present invention, a system for stabilizing the moisture content at the outlet of a loose rehumidification machine includes an inlet moisture meter 5 installed at the inlet side of the loose rehumidification machine to obtain the average moisture content of the tobacco sheets after slicing, and an outlet moisture meter 10 installed at the outlet side of the loose rehumidification machine to obtain the average moisture content at the outlet of the loose rehumidification machine. The inlet moisture meter 5 and the outlet moisture meter 10 are respectively connected to a control unit. The control unit is connected to the water supply unit of the loose rehumidification machine. The control unit obtains the average water supply amount for the loose rehumidification process, i.e., the water supply amount of the water supply unit, based on the designed moisture content at the outlet of the loose rehumidification machine, the average moisture content of the tobacco sheets after slicing, and the amount of steam humidification water in the loose rehumidification machine. The control unit adjusts the water supply amount for the next batch of tobacco packs in a timely manner based on the average moisture content at the outlet of the loose rehumidification machine of the previous batch of tobacco packs.
[0027] It needs to be explained that the reference Figure 2As shown, an inlet vibrating conveyor 7 is installed at the inlet end of the loosening and rehumidifying machine, a first conveyor 4 is installed at the inlet end of the inlet vibrating conveyor, a weighing scale 6 is installed between the first conveyor 4 and the inlet vibrating conveyor 7, a slicer 3 is also installed at the inlet end of the belt conveyor 4, a roller conveyor 2 is installed at the front end of the slicer 3, and a tobacco sheet bag 1 is installed on the inlet side of the roller conveyor 2; an outlet vibrating conveyor 9 is installed at the outlet end of the loosening and rehumidifying machine 8, a second conveyor 11 is installed at the outlet end of the outlet vibrating conveyor 9, and the water addition unit is an existing structural component of the loosening and rehumidifying machine used for water addition.
[0028] Specifically, the inlet moisture meter 5 is installed at the inlet of the loosening and rehumidifying machine 8 on the first conveyor 4 or the inlet vibrating conveyor, which can collect online moisture data in a timely manner and provide online data to the control unit. The outlet moisture meter 10 is installed on the outlet vibrating conveyor 9 or the second conveyor 11 of the loosening and rehumidifying machine, which can collect online moisture of the tobacco sheets after the loosening and rehumidifying machine 8 in a timely manner and provide online data to the moisture adjustment control unit.
[0029] Among them, the control unit 12 is a PLC controller or other type of controller. The control unit can also be the controller of the loose rehumidifier. The inlet moisture meter and the outlet moisture meter are existing moisture measuring instruments.
[0030] The control unit 12 collects the inlet and outlet moisture of the loose rehydration material in a timely manner, records the moisture information of different grades of tobacco sheets, and arranges them sequentially into the slicer 3 according to the difference in inlet and outlet moisture. It automatically calculates and controls the amount of loose rehydration water added. At the same time, it adjusts the amount of loose rehydration water added in a timely manner based on the average value of the loose rehydration outlet of the previous batch of material to stabilize the moisture content of the loose rehydration outlet tobacco sheets.
[0031] The average water addition Q in the loosening and rehydration process is based on [(design value of moisture content at the outlet of loosening and rehydration y - average moisture content of the raw tobacco sheets after slicing x)]. The steam humidification water volume (z) in the 3000-loose rehumidifier was obtained as kg / h.
[0032] To ensure that water is added sequentially from high to low concentration to the tobacco leaves, the control unit stores the average water addition amount for the loosening and rehydration process corresponding to various brands of tobacco leaves, and sets a water addition increment / decrease coefficient. That is, the initial water addition amount for the first pack of tobacco leaves is Q1 = (average water addition amount Q for the loosening and rehydration process + water addition increment / decrease coefficient) The processing quality per unit time of the loosening and rehumidifying machine), the process time of the loosening and rehumidifying machine is t minutes, after t minutes the first set value is automatically reduced, and the water addition is (Q1 - water addition increase / decrease coefficient). Processing capacity per unit time of the loose rehumidifier / 60 Processing time) kg / h, and so on. After 1 hour, the water addition is automatically reduced to Q kg / h. The water addition for the last pack of tobacco sheets is (Q - water addition increase / decrease coefficient). The processing mass per unit time of the loosening and rehumidifying machine is kg / h, and the average water addition of the entire batch of tobacco sheets is Q kg / h.
[0033] The magnitude of the water addition increase / decrease coefficient (which can be 1%) is directly proportional to the processing quality of the loosening and rehydration machine per unit time.
[0034] It should be noted that the control unit is also connected to the scanning mechanism (which can scan the QR code or barcode information on the tobacco sheet package) at the third conveyor, such as roller conveyor 2. The third conveyor is located on the inlet side of the slicer 3. If the control unit detects that adjacent n packages of tobacco sheets are of the same grade through the scanning mechanism, during the subsequent nt minutes of water addition, the water addition amount will be automatically reduced to {(Q1 - water addition increase / decrease coefficient)}. Processing capacity per unit time of the loose rehumidifier / 60 it) + ... + (Q1 - coefficient for increase or decrease in water volume) Processing capacity per unit time of the loose rehumidifier / 60 nt)} / n kg / h, where i is the i-th pack of tobacco leaves entering the loosening and rehumidification machine, i is greater than or equal to 2, and n is a natural number.
[0035] In this way, the control unit adds water to the tobacco sheets entering the loosening and rehumidifying machine 8 in a manner from high to low to ensure the stability of the moisture content of the tobacco sheets after loosening and rehumidifying and drying.
[0036] When the control unit detects that the average moisture content at the loose re-humidification outlet is lower than the designed moisture content by a first difference △x, the control unit controls the water supply unit to automatically replenish the average water supply amount in the loose re-humidification process. The control unit then controls the water supply unit to adjust the average water supply amount Q for the next batch of tobacco sheets. x = (Average water addition during the loosening and rehydration process Q + Δx) The processing capacity of the loosening and rehumidifying machine per unit time is 3000 (e.g., adjust the initial water addition value Q accordingly). x1 = (Q) x +0.01 3000).
[0037] When the control unit detects that the average moisture content at the loose re-moistening outlet is higher than the designed moisture content at the loose re-moistening outlet by a second difference Δy, the control unit controls the water addition unit to adjust the average water addition amount for the next batch of tobacco sheets to Q. y =(Q-△y 3000), adjust the initial water addition value accordingly to Q y1 = (Q) y +0.01 3000), automatically decrease by 2 kg / h after t minutes (Q) y1 -Water addition increase / decrease coefficient Processing capacity per unit time of the loose rehumidifier / 60 Process time is 0.01 seconds. 3000 / 60 4) The amount of water added is (Q) y1 -2) kg / h, and so on.
[0038] In addition, when the control unit detects that the average moisture content at the loose rehydrated outlet is lower than the allowable tolerance of the loose rehydrated outlet moisture content design value, that is, when the average moisture content at the loose rehydrated outlet obtained by the outlet moisture meter is lower than the minimum value of the loose rehydrated outlet moisture content design value, the control unit determines the water addition increase / decrease coefficient based on the loose rehydrated outlet moisture content design value, the average moisture content at the loose rehydrated outlet, and the moisture difference between the average moisture content at the loose rehydrated outlet and the lower limit of the loose rehydrated outlet moisture content design value, and then determines the average water addition value for the next batch of tobacco sheets to make up for the water addition difference.
[0039] When the control unit detects that the average moisture content at the loose rehydrated outlet exceeds the allowable tolerance of the design value for loose rehydrated outlet moisture content, or when the average moisture content at the loose rehydrated outlet is higher than the upper limit of the design value for loose rehydrated outlet moisture content, the control unit determines the water addition increase / decrease coefficient based on the average moisture content at the loose rehydrated outlet, the design value for loose rehydrated outlet moisture content, and the moisture difference between the average moisture content at the loose rehydrated outlet and the upper limit of the design value for loose rehydrated outlet moisture content. In this way, the control unit determines the average water addition amount for the next batch of tobacco sheets and makes up for the water addition difference.
[0040] The system provided in this embodiment can adjust the amount of water added for loosening and rehydration in a timely manner when the control unit detects that the moisture content at the outlet of the previous batch of material is different from the design value, so as to ensure the stability of the outlet moisture content between batches of material.
[0041] Example 2 This embodiment provides a method for stabilizing the moisture content of loose, rehydrated outlets, employing a system for stabilizing the moisture content of loose, rehydrated outlets as described in Embodiment 1, with reference to... Figure 1 As shown, it includes the following: An inlet moisture meter 5 is installed on the inlet side of the loosening and rehumidifying machine, and an outlet moisture meter 10 is installed on the outlet side of the loosening and rehumidifying machine to obtain the average outlet moisture value of the loosening and rehumidifying machine. A certain brand of tobacco sheet is produced in batches of 6000 kg (30 bales, but not limited to) on a tobacco processing line (but not limited to) with a processing capacity of 3000 kg / h per unit time using a loosening and rehumidification machine. Each bale of tobacco sheet (200 kg / bale, but not limited to) takes approximately t minutes to pass through the loosening and rehumidification process. A single grade consists of 2 bales of tobacco sheet, with a rehumidification time of 2t minutes. The average moisture content of the tobacco sheet after slicing is x, the design moisture content at the loosening and rehumidification outlet is y, and the steam humidification water volume is z kg / h. Therefore, the average water addition Q in the loosening and rehumidification process is [(yx)]. 3000-z] kg / h; Case Design: A certain brand of tobacco flakes is produced in batches of 6000kg (30 packs) on a 3000kg / h production line. Each pack of tobacco flakes (200kg / pack) undergoes a loosening and rehumidification process for t=4 minutes. A single grade consists of 2 packs of tobacco flakes, with a rehumidification time of 8 minutes. The average moisture content of the tobacco flakes after slicing is x=11%, the designed moisture content at the loosening and rehumidification outlet is y=17±1.5%, and the steam humidification water volume is z=60kg / h. Therefore, the average water addition amount Q for the loosening and rehumidification process is Q=〔(yx)〕. 3000-z] = (3000 (6% - 60) = 120 kg / h.
[0042] The tobacco leaf bales (generally weighing 200 kg) are conveyed to the slicer 3 via roller conveyor 2. (During this process, the system collects information such as the origin and grade of the tobacco leaves through the QR code information of the tobacco leaf bales, and establishes a one-to-one correspondence with the moisture values of the tobacco leaf bales entering and leaving the loose rehumidification machine.) After slicing (generally 4 cuts to 5 pieces), the tobacco leaf bales become tobacco blocks, which are evenly arranged in sequence on the first conveyor 4. During the conveying of the tobacco blocks via the belt conveyor 4, the inlet moisture meter 5 installed on the first conveyor 4 detects the moisture content of each tobacco leaf block and transmits the collected moisture information to the control unit. The tobacco bales pass through the weighing scale 6 and the inlet vibrating conveyor 7 into the loosening and rehumidifying machine 8. After a few minutes, the loosened tobacco sheets are conveyed through the outlet vibrating conveyor 9 to the second conveyor 11. The outlet moisture meter 10 is installed on the second conveyor 11. The outlet moisture meter 10 starts to detect the moisture content of the tobacco sheet bale for about 4 minutes. The average value of the moisture meter during this period is taken as the moisture content of the tobacco sheet bale. The moisture information is transmitted to the control unit 12, which correlates the inlet and outlet moisture content of the tobacco sheet bale and calculates the moisture difference for subsequent tobacco sheet bale feeding sequence.
[0043] Example 1, Initial Production: Based on the difference in moisture content between the inlet and outlet of different grades of tobacco leaves, they are arranged in order of increasing moisture content and enter the loosening and rehumidifying machine. The control unit sets a 1% moisture content adjustment coefficient based on the average water addition rate of a certain brand being 120 kg / h. That is, the initial water addition rate for the first batch of tobacco leaves with lower moisture content is 150 kg / h (120 + 0.01). After 4 minutes, the water volume is automatically reduced by 2 kg / h (30 / 15), and the water volume is 148 kg / h. If the control unit detects that the second and third packs of tobacco are of the same grade, the water volume is automatically reduced to 145 kg / h [(146+144) / 2] during the subsequent 8 minutes of water addition. If the control unit detects that the next three packs of tobacco are of the same grade, the water volume is automatically reduced to 140 kg / h [(142+140+138) / 3] during the subsequent 12 minutes of water addition. And so on. After 1 hour, the water volume is automatically reduced to 120 kg / h. Before the end of production, the water volume of the last pack of tobacco is 90 kg / h, and the average water volume of the entire batch of tobacco is 120 kg / h.
[0044] Example 2, Reproduction: When the control unit detects that the average moisture content at the loose rehydration outlet is lower than the designed moisture content at the loose rehydration outlet, it automatically replenishes the average water addition amount for the loose rehydration process based on the moisture difference. For example: when the average moisture content at the loose, rehydrated outlet is detected to be 16.8% (design value for loose, rehydrated outlet moisture content is 17.0%), the control unit adjusts the water supply unit to an average water supply rate of 126 kg / h for the next batch of tobacco sheets (120 + 0.2%). 3000), correspondingly adjust the initial water addition to 156 kg / h (126 + 0.01). After 4 minutes, the water volume will automatically decrease by 2 kg / h (30 / 15), resulting in a water volume of 154 kg / h. If the control unit detects that the second and third packs of tobacco are of the same grade, the water volume will be automatically reduced to 151 kg / h during the subsequent 8 minutes of water addition. This process will continue until 1 hour later, when the water volume will be automatically reduced to 126 kg / h. Before the end of production, the water volume of the last pack of tobacco is 96 kg / h, and the average water volume of the entire batch of tobacco is 126 kg / h.
[0045] Example 3, Reproduction: When the control unit detects that the average moisture content at the loose re-moistening outlet is higher than the design value, the control unit reduces the initial value of the amount of water added to the next batch of tobacco sheets based on the moisture difference. For example: Suppose the average moisture content at the loose, rehydrated outlet is detected to be 17.5%, higher than the design value of 17%, the control unit will automatically adjust the average water addition for the next batch to 105 kg / h (120-0.5%). 3000), correspondingly adjust the initial water addition to 135 kg / h (105 + 0.01). After 4 minutes, the water volume is automatically reduced by 2 kg / h (30 / 15), and the water volume is 133 kg / h. If the control unit detects that the second and third packs of tobacco are of the same grade, the water volume is automatically reduced to 130 kg / h [133 - (4 + 2) / 2] during the subsequent 8 minutes of water addition. This process continues until 1 hour later, when the water volume is automatically reduced to 105 kg / h. Before the end of production, the water volume of the last pack of tobacco is 85 kg / h, and the average water volume of the entire batch of tobacco is 105 kg / h.
[0046] Example 4, Reproduction: Correction for the tolerance of the average moisture content at the loose re-moistening outlet being lower than the design value: When the control unit detects that the tolerance of the loose re-moistening outlet moisture content of the previous batch is lower than the minimum set value, the control unit determines the water addition increase / decrease coefficient based on the design value of the loose re-moistening outlet moisture content, the average moisture content at the loose re-moistening outlet, and the difference between the moisture content differences. This determines the average water addition for the next batch of tobacco sheets and automatically makes up for the water addition difference. The moisture difference is obtained based on experimental data. In this embodiment, the moisture difference is selected as 0.2%, which is neither too large nor too small, ensuring the rationality of the water addition increase / decrease coefficient and avoiding large fluctuations in the average water addition for the next batch. For example, when the outlet moisture meter detects an average outlet moisture content of 15.3% for the loose re-moistening process, and sends this information to the control unit, the control unit determines that if the average outlet moisture content is lower than the lower limit of (17.0 ± 1.5%), the control unit automatically adjusts the water addition coefficient for the next batch to 1.5% (17.0% - 15.3% - 0.2%). That is, the average water addition for the loose re-moistening process is 165 kg / h (120 + 1.5%). 3000), correspondingly adjust the initial water addition to 195 kg / h (165 + 1%). (3000), after 4 minutes the water volume will automatically decrease by 2 kg / h, the water volume will be 193 kg / h, and so on. After 1 hour the water volume will be automatically reduced to 165 kg / h, and the water volume of the last pack will be 135 kg / h.
[0047] Example 5, Reproduction: The mean moisture content at the outlet of loose rehydrated products exceeds the allowable tolerance of the design value for loose rehydrated product outlet moisture content: When the outlet moisture meter detects an average outlet moisture content of 18.6% for the loose re-moistening process, and sends this information to the control unit, the control unit determines that if the average outlet moisture content is higher than the design limit (17.0 ± 1.5%), the control unit automatically adjusts the water addition coefficient for the next batch to 1.4% (18.6% - 17.0% - 0.2%). That is, the average water addition for the loose re-moistening process is 78 kg / h (120 - 1.4%). 3000), correspondingly adjust the initial water addition to 118 kg / h (78 + 1%). (3000), after 4 minutes the water volume will automatically decrease by 2kg / h, the water volume will be 116kg / h, and so on. After 1 hour the water volume will automatically decrease to 78kg / h, and the water volume of the last pack will be 48kg / h.
[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.
Claims
1. A system for stabilizing the moisture content of loosely moistened outlets, characterized in that, The system includes an inlet moisture meter installed at the inlet side of the loosening and rehumidifying machine to obtain the average moisture content of the tobacco sheets after slicing, and an outlet moisture meter installed at the outlet side of the loosening and rehumidifying machine to obtain the average moisture content at the outlet of the loosening and rehumidifying machine. The inlet and outlet moisture meters are respectively connected to the control unit, which is connected to the water supply unit of the loosening and rehumidifying machine. The control unit obtains the average water supply amount for the loosening and rehumidifying process, i.e., the water supply amount of the water supply unit, based on the designed outlet moisture content of the loosening and rehumidifying machine, the average moisture content of the tobacco sheets after slicing, the processing quality per unit time of the loosening and rehumidifying machine, and the amount of steam humidification water in the loosening and rehumidifying machine. The control unit adjusts the average water supply amount for the next batch of tobacco packs in a timely manner based on the average outlet moisture content of the previous batch of tobacco packs.
2. The system for stabilizing the moisture content of loose, rehydrated outlets according to claim 1, characterized in that, The inlet moisture meter is installed at the first conveyor or the inlet vibrating conveyor at the inlet of the loosening and rehumidifying machine, and the outlet moisture meter is installed at the outlet vibrating conveyor or the second conveyor at the outlet of the loosening and rehumidifying machine. The average water addition Q in the loosening and rehydration process is based on [(design value of moisture content at the outlet of loosening and rehydration - average moisture content of the raw tobacco sheets after slicing x)]. The processing capacity per unit time of the loosening and rehumidifying machine is obtained by measuring the steam humidification water volume (z) in the loosening and rehumidifying machine (kg / h).
3. The system for stabilizing the moisture content of loose, rehydrated outlets according to claim 1, characterized in that, The control unit stores the average water addition amount for the loosening and rehydration process corresponding to various brands of tobacco sheets, and sets a water addition increment / decrease coefficient, that is, the initial water addition amount for the first pack of tobacco sheets is Q1 = (average water addition amount Q for the loosening and rehydration process + water addition increment / decrease coefficient) The processing quality per unit time of the loosening and rehumidifying machine), the process time of the loosening and rehumidifying machine is t minutes, after t minutes the first set value is automatically reduced, and the water addition is (Q1 - water addition increase / decrease coefficient). Processing capacity per unit time of the loose rehumidifier / 60 Processing time) kg / h, and so on. After 1 hour, the water addition is automatically reduced to Q kg / h. The water addition for the last pack of tobacco sheets is (Q - water addition increase / decrease coefficient). The processing mass per unit time of the loosening and rehumidifying machine is kg / h, and the average water addition of the entire batch of tobacco sheets is Q kg / h; The magnitude of the water addition increase / decrease coefficient is directly proportional to the processing quality per unit time of the loosening and rehumidifying machine.
4. The system for stabilizing the moisture content of loose, rehydrated outlets according to claim 3, characterized in that, The control unit is also connected to a scanning mechanism at the third conveyor, which is located at the inlet side of the slicer. If the control unit detects that adjacent n packs of tobacco sheets are of the same grade through the scanning mechanism, it will automatically adjust the water addition amount to {(Q1 - water addition increase / decrease coefficient)} during the subsequent nt minutes of water addition. Processing capacity per unit time of the loose rehumidifier / 60 it) + ... + (Q1 - coefficient for increase or decrease in water volume) Processing capacity per unit time of the loose rehumidifier / 60 nt)} / n kg / h, where i is the i-th pack of tobacco sheets entering the loosening and rehumidification machine.
5. The system for stabilizing the moisture content of loose, rehydrated outlets according to claim 1, characterized in that, When the control unit detects that the average moisture content at the loose re-humidification outlet is lower than the designed moisture content at the loose re-humidification outlet by a first difference Δx, the control unit controls the water supply unit to automatically replenish the average water supply amount in the loose re-humidification process. The control unit then controls the water supply unit to adjust the average water supply amount Q for the next batch of tobacco sheets. x = (Average water addition during the loosening and rehydration process Q + Δx) (Based on the processing quality per unit time of the loosening and rehumidifying machine), the initial value Q of the water addition for the next batch of tobacco sheets should be adjusted accordingly. x1 = (Q) x +Water addition coefficient The processing quality per unit time of the loose rehumidifier.
6. The system for stabilizing the moisture content of loose, rehydrated outlets according to claim 1, characterized in that, When the control unit detects that the average moisture content at the loose re-moistening outlet is higher than the designed moisture content at the loose re-moistening outlet by a second difference Δy, the control unit controls the water addition unit to adjust the average water addition amount for the next batch of tobacco sheets to Q. y =(Q-△y The processing capacity per unit time of the loosening and rehumidifying machine), adjust the initial water addition value accordingly to Q. y1 =(Q y +Water addition coefficient The processing capacity per unit time of the loose rehumidifier), automatically reduced after t minutes (Q). y1 -Water addition increase / decrease coefficient Processing capacity per unit time of the loose rehumidifier / 60 Process time) kg / h, and so on.
7. A system for stabilizing the moisture content of loose, rehydrated outlets according to claim 3 or 4, characterized in that, When the control unit detects that the average moisture content at the loose re-moistening outlet is lower than the allowable tolerance of the design value for the loose re-moistening outlet moisture content, the control unit determines the water addition increase / decrease coefficient based on the design value of the loose re-moistening outlet moisture content, the average moisture content at the loose re-moistening outlet moisture content, and the difference between the moisture content differences. Then, it determines the average water addition value for the next batch of tobacco sheets to make up for the water addition difference. The moisture content difference is obtained based on test data.
8. A system for stabilizing the moisture content of loose, rehydrated outlets according to claim 3 or 4, characterized in that, When the control unit detects that the average moisture content at the loose re-moistening outlet exceeds the allowable tolerance of the designed moisture content at the loose re-moistening outlet, the control unit determines the water addition increase / decrease coefficient based on the difference between the average moisture content at the loose re-moistening outlet, the designed moisture content at the loose re-moistening outlet, and the moisture difference, and then determines the average water addition amount for the next batch of tobacco sheets to make up the water addition difference. The moisture difference is 0.2%.
9. A method for stabilizing the moisture content of loose, rehydrated outlet products, characterized in that, The system for stabilizing the moisture content of loose, rehydrated outlets according to any one of claims 1-8 includes the following: An inlet moisture meter is installed on the inlet side of the loosening and rehumidifying machine, and an outlet moisture meter is installed on the outlet side of the loosening and rehumidifying machine to obtain the average outlet moisture value of the loosening and rehumidifying machine. The tobacco leaf bales are sorted from low to high according to the difference in moisture content between the inlet and outlet, and then enter the loosening and rehumidification machine in sequence; The control unit stores the average water addition amount for the loosening and rehydration process corresponding to various brands of tobacco sheets, and sets a water addition increment / decrease coefficient. That is, the initial water addition amount for the first pack of tobacco sheets is Q1 = (average water addition amount Q for the loosening and rehydration process + water addition increment / decrease coefficient). The processing quality per unit time of the loosening and rehumidifying machine), the process time of the loosening and rehumidifying machine is t minutes, after t minutes the first set value is automatically reduced, and the water addition is (Q1 - water addition increase / decrease coefficient). Processing capacity per unit time of the loose rehumidifier / 60 Processing time) kg / h, and so on. After 1 hour, the water addition is automatically reduced to Q kg / h. The water addition for the last pack of tobacco sheets is (Q - water addition increase / decrease coefficient). The processing mass per unit time of the loosening and rehumidifying machine is kg / h, and the average water addition of the entire batch of tobacco sheets is Q kg / h.
10. The method for stabilizing the moisture content of loose, rehydrated outlet products according to claim 9, characterized in that, It also includes the following: When the control unit detects that the average moisture content at the loose re-humidification outlet is lower than the designed moisture content at the loose re-humidification outlet by a first difference Δx, the control unit controls the water supply unit to automatically replenish the average water supply amount in the loose re-humidification process. The control unit then controls the water supply unit to adjust the average water supply amount Q for the next batch of tobacco sheets. x = (Average water addition during the loosening and rehydration process Q + Δx) (Based on the processing quality per unit time of the loosening and rehumidifying machine), the initial value Q of the water addition for the next batch of tobacco sheets should be adjusted accordingly. x1 = (Q) x +Water addition coefficient (Processing quality per unit time of the loose rehumidifier) When the control unit detects that the average moisture content at the loose re-moistening outlet is higher than the designed moisture content at the loose re-moistening outlet by a second difference Δy, the control unit controls the water addition unit to adjust the average water addition amount for the next batch of tobacco sheets to Q. y =(Q-△y The processing capacity per unit time of the loosening and rehumidifying machine), adjust the initial water addition value accordingly to Q. y1 =(Q y +Water addition coefficient The processing quality per unit time of the loose rehumidifier.