Tobacco flow matching control method of cut tobacco production line
By calculating and adjusting the flow matching parameters of tobacco leaf on the wire making production line, the problems of frequent start and stopping of the equipment and uneven flow are solved, the continuity and stability of production are achieved, and the quality of shredding and equipment life are improved.
Patent Information
- Application Number
- CN202510741677.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-05
- Publication Date
- 2025-07-08
AI Technical Summary
The production process discontinuity, energy waste and equipment wear caused by frequent start and stop of equipment in the wire making production line, and the insufficient matching of tobacco leaf flow affects the fineness and uniformity of the shredding process, which in turn affects the quality of the cigarette.
By collecting wire production line data, calculating the flow matching parameters of tobacco leaf, adjusting the cut flow and discharge frequency, dynamic matching of the cut and drying process is achieved, and automatic control is performed using memory and processor.
Significantly reduce the start-stop frequency of equipment, reduce energy waste, improve the consistency of shredding quality, ensure the quality of cigarette products, and extend the service life of the equipment.
Smart Images
Figure CN120267053A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of tobacco processing, and specifically to a control method for the tobacco leaf flow matching of a cut tobacco production line, which is used to improve the production efficiency and stability of the cut tobacco production line. Background Art
[0002] The cut tobacco production line, as a crucial hub link in the tobacco processing industrial chain, its efficient and smooth operation is not only a yardstick for measuring the production efficiency of an enterprise, but also the key to ensuring the stable quality and cost control of cigarette products. This production line, from the preliminary treatment of tobacco leaf raw materials to fine cutting, and then to subsequent drying and shaping, each step is closely linked, and any slight fluctuation in any link may have a profound impact on the entire production process.
[0003] However, in current production practices, many cut tobacco production lines are facing severe challenges: frequent start-stop of equipment not only interrupts the continuity of the production process, increases operation complexity and labor costs, but also causes unnecessary energy consumption and environmental pollution due to frequent start-up and stop processes; at the same time, the lack of flow matching makes the flow of raw materials during processing show an unbalanced state, directly affecting the fineness and uniformity of the cutting link, and further having a negative impact on the combustion performance, taste experience and even the overall quality of cigarettes. In addition, long-term idling of equipment exacerbates mechanical wear, shortens the service life of equipment, increases maintenance costs, and poses a potential threat to the long-term healthy operation of the production line. Summary of the Invention
[0004] The present invention is proposed to solve the above-mentioned deficiencies existing in the prior art, and provides a control method for the tobacco leaf flow matching of a cut tobacco production line, in order to achieve continuous and uninterrupted production within a production batch by accurately calculating and optimizing the flow matching of each key node of the production line, thereby reducing the number of equipment start-stop times and improving production efficiency and stability.
[0005] To achieve the above object, the present invention adopts the following technical solutions: A control method for the tobacco leaf flow matching of a cut tobacco production line according to the present invention is characterized by including the following steps: Step 1: Collect the storage quantity M1 of the tobacco leaf storage cabinet in the current batch on the cut tobacco production line in the cut tobacco workshop, the percentage η1 of the length of the tobacco leaf entering the cabinet in the current batch, the actual weight M2 of the tobacco leaf entering the cabinet in the current batch, the single / double cabinet coefficient σ1, the frequency f of the discharge bottom belt of the tobacco leaf storage cabinet in the current batch, the cutting flow rate FL1 of the cutting machine in the current batch on the cut tobacco production line, and the drying flow rate FL2 of the dryer in the current batch. Step 2: Based on the data collected in Step 1, calculate the characterization parameters for the matching of tobacco leaf flow in the current batch, including: the weight percentage η2 of the actual tobacco leaves entering the cabinet, the weight-length ratio η3 of the actual tobacco leaves entering the cabinet, the cutting-drying flow ratio η4 of the tobacco leaves, the discharge flow index ω1 of the tobacco leaf storage cabinet, the index ratio η5 of the cutting flow to the discharge flow of the tobacco leaf storage cabinet, the discharge percentage η6 of the tobacco leaf storage cabinet when the cutting machine starts, and the cumulative cutting amount M3 in the current batch; Step 3: Adjust the characterization parameters, including: the cutting flow FL1, the frequency f, the discharge percentage η6, and the cumulative cutting amount M3, so as to match the cutting flow FL1 and the drying flow FL2.
[0006] The control method for the matching of tobacco leaf flow in the tobacco leaf production line of the present invention is also characterized in that Step 2 includes: Step 2.1: Obtain the weight percentage η2 of the actual tobacco leaves entering the cabinet by using Equation (1): η2 = M2 / M1 (1) Step 2.2: Obtain the weight-length ratio η3 of the actual tobacco leaves entering the cabinet by using Equation (2): η3 = M2 / (M1 × η1) (2) Step 2.3: Obtain the cutting-drying flow ratio η4 of the tobacco leaves by using Equation (3): η4 = FL1 / FL2 (3) Step 2.4: Obtain the discharge flow index ω1 of the tobacco leaf storage cabinet by using Equation (4): ω1 = M2 × f × σ1 / (M1 × η1) (4) Step 2.5: Obtain the index ratio η5 of the cutting flow to the discharge flow of the tobacco leaf storage cabinet by using Equation (5): η5 = FL1 × M1 × η1 / (M2 × f × σ1) (5) Step 2.6: Under the condition that the processing of the current batch by the cutting machine does not stop, obtain the discharge percentage η6 of the tobacco leaf storage cabinet when the cutting machine starts by using Equation (6): η6 = η1 - η7 (6) In Equation (6), η7 is the remaining percentage in the current batch; Step 2.7: When the drying machine starts, take the cumulative amount of the tobacco leaves in the current batch passing through the electronic scale before the cutting machine as the cumulative cutting amount M3 in the current batch.
[0007] Further, Step 3 includes: Step 3.1: In the current batch, set the cutting flow FL1 as follows to keep the feeding bin before drying in a state between medium level and full bin, and keep the feeding bin before the cutting machine and the cutting machine running all the time; If the feeding bin before cut tobacco drying is full and the cut tobacco machine is stopped in the current batch, gradually reduce the flow rate FL1 of the cut tobacco machine until the cut tobacco machine maintains a continuous running state; If the material level in the feeding bin before cut tobacco drying is too low and does not reach the detection switch of the medium material level in the current batch, that is, the cut tobacco supply cannot meet the drying flow rate FL2, gradually increase the cut tobacco flow rate FL1 so that while the cut tobacco machine runs continuously, the feeding bin before cut tobacco drying is in a state between the medium material level and full bin, and set the corresponding cut tobacco flow rate at this time as the theoretical optimal cut tobacco flow rate FL1 * , so as to obtain the optimal cut tobacco drying flow rate ratio η4 of the tobacco leaves by using formula (3) * ; Step 3.2: In the current batch, set the frequency f of the discharge bottom belt as follows to make the feeding bin before cut tobacco keep between the medium material level and full bin, and the feeding bin before cut tobacco to the storage cabinet bottom belt always keep running: If the feeding bin before cut tobacco is full and the storage cabinet discharge is stopped in the current batch, gradually reduce the frequency f until the feeding bin before cut tobacco keeps between the medium material level and full bin, and the feeding bin before cut tobacco to the storage cabinet bottom belt always keep running; If the material level in the feeding bin before cut tobacco is too low and does not reach the detection switch of the medium material level, that is, the cut tobacco supply cannot meet the cut tobacco flow rate FL1, gradually increase the frequency f of the discharge bottom belt so that the feeding bin before cut tobacco keeps between the medium material level and full bin, and the feeding bin before cut tobacco to the storage cabinet bottom belt always keep running; and set the corresponding discharge bottom belt frequency at this time as the theoretical optimal storage cabinet bottom belt frequency f * , so as to obtain the optimal discharge flow rate index ω1 of the tobacco leaf storage cabinet by using formula (4) * ; Step 3.3: According to the optimal cut tobacco drying flow rate ratio η4 * and the optimal discharge flow rate index ω1 * , match the storage cabinet discharge flow rate with the theoretical optimal cut tobacco flow rate FL1 * so as to make the theoretical optimal cut tobacco flow rate FL1 * match with the drying flow rate FL2 to realize the dynamic matching of the flow rates of the cut tobacco and drying processes, and record all the optimal values; Step 3.4: Determine the optimal discharge percentage η6 of the tobacco leaf storage cabinet when the cut tobacco machine starts and the feeding bin before cut tobacco reaches a state between half bin and full bin * : Record the storage cabinet discharge percentage η6 when the cut tobacco machine starts. During the process of the cut tobacco machine running according to the theoretical optimal cut tobacco flow rate FL1 * : If the material quantity in the feeding bin before cutting continuously decreases in the current batch and even drops below half bin, then gradually increase the discharge percentage η6 of the storage cabinet at the start of cutting until the feeding bin before cutting in the entire batch is in a state between half bin and full bin; If the material quantity in the feeding bin before cutting continuously increases in the current batch and even approaches or reaches full bin, then gradually decrease the discharge percentage η6 of the storage cabinet at the start of cutting until the feeding bin before cutting in the entire batch is in a state between half bin and full bin, and use the discharge percentage of the storage cabinet corresponding to the state between half bin and full bin of the feeding bin before cutting as the optimal discharge percentage η6 * ; Step 3.5: Determine the optimal cumulative cutting quantity M3 when the cut tobacco dryer starts and the feeding bin before cut tobacco drying is in a state between half bin and full bin * : Record the cumulative cutting quantity M3 when the cut tobacco dryer starts. During the operation of the cutting machine according to the theoretical optimal cutting flow rate FL1 * : If the material quantity in the feeding bin before cut tobacco drying continuously decreases in the current batch and even drops below half bin, then gradually increase the cumulative cutting quantity M3 when the cut tobacco dryer starts until the feeding bin before cut tobacco drying in the entire batch is in a state between half bin and full bin; If the material quantity in the feeding bin before cut tobacco drying continuously increases in the current batch and even approaches or reaches full bin, then gradually decrease the cumulative cutting quantity M3 when the cut tobacco dryer starts until the feeding bin before cut tobacco drying in the entire batch is in a state between half bin and full bin, and use the cumulative cutting quantity corresponding to the state between half bin and full bin of the feeding bin before cut tobacco drying as the optimal cumulative cutting quantity M3 * ; Step 3.6: Calculate the corresponding current optimal cutting flow rate FL1 ** and the current optimal frequency f of the storage cabinet bottom belt ** using equations (3) and (4) based on all the optimal values, and use them to control the running speeds of the cutting machine and the storage cabinet bottom belt on the cut tobacco production line to achieve the matching of the tobacco leaf flow rate on the production line.
[0008] An electronic device of the present invention includes a memory and a processor, characterized in that the memory is used to store a program for supporting the processor to execute the control method, and the processor is configured to execute the program stored in the memory.
[0009] A computer-readable storage medium of the present invention stores a computer program on the computer-readable storage medium, characterized in that the computer program executes the steps of the control method when being run by a processor.
[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention provides a solution for optimizing an automatic control system. According to data such as the set value of the cut tobacco flow rate and the actual material quantity of different batches, it automatically calculates the appropriate cut tobacco flow rate and the frequency of the bottom belt out of the cabinet, and respectively and automatically prompts the central control to start the cut tobacco and cut tobacco drying according to the percentage of the storage cabinet discharging and the cumulative cut tobacco quantity, further improving the accuracy and intelligence of production.
[0011] 2. It is particularly urgent to explore and implement a scientific and efficient method for calculating and optimizing the flow rate matching in the present invention. This method is based on advanced sensor technology, big data analysis, and control algorithms, and realizes real-time monitoring and precise control of each key link on the cut tobacco production line.
[0012] 3. The present invention constructs an accurate flow rate model, combines historical production data with real-time feedback information, and dynamically adjusts equipment parameters such as the cut tobacco flow rate and the discharging rate of the storage cabinet to achieve the best matching of the material flow rate in the production process. This can not only significantly reduce the start-stop frequency of equipment, reduce energy waste and idling losses, but also effectively improve the consistency of the cut tobacco quality, ensuring the excellent quality of cigarette products. At the same time, it extends the service life of the equipment, laying a solid foundation for the sustainable development of tobacco processing enterprises. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the composition of the flow rate matching characterization parameters of the present invention; Figure 2 It is a process diagram of the application of the flow rate matching characterization parameters of the present invention in actual flow rate matching control; Figure 3 The first step of the experiment, a questionnaire on the start-stop times of the cut tobacco machine for three experimental batches compared with the original production batches; Figure 4 The second step of the experiment, a comparison chart of the start-stop times of the equipment before cutting tobacco for three experimental batches compared with the original production batches Figure 5 The second step of the experiment, further reducing the frequency of the bottom belt, a comparison chart of the start-stop times of the equipment before cutting tobacco for six batches in two experiments compared with the original production batches; Figure 6 A comparison chart of the start-stop times of the equipment in the cut tobacco and cut tobacco drying processes before and after using the flow rate matching parameters. DETAILED DESCRIPTION OF THE INVENTION
[0014] The present invention will be described in detail below in conjunction with the drawings, tables, and specific embodiments.
[0015] In this embodiment, a control method for the tobacco leaf flow rate matching of a cut tobacco leaf production line includes the following steps: Step 1: Collect the storage M1 of the tobacco storage cabinet under the current batch on the leaf production line in the silk workshop, the percentage η1 of the length of the tobacco entering the cabinet under the current batch, the actual weight M2 of the tobacco entering the cabinet under the current batch, the single and double cabinet coefficient σ1, the frequency f of the discharge bottom belt of the tobacco storage cabinet under the current batch, the cutting flow FL1 of the cutting machine under the current batch on the leaf production line, and the drying flow FL2 of the drying machine under the current batch; Example: Investigate and analyze the flow matching and equipment start and stop conditions of the production line, and design flow matching characterization parameters based on actual production needs, and study solutions for flow matching optimization.
[0016] (1) Analysis of the current status of shredding start and stop: Through the investigation of the flow rate and equipment start-up and shutdown conditions of 9 production batches, the data obtained are shown in Table 1.
[0017] Table 1 Survey form on cutting and drying process, flow rate and start and stop of cutting machine Judging from the number of shutdowns of the shredder, the shredder flow rate is more than 1000 kg / h greater than the drying flow rate, and the average number of shutdowns per batch reaches 5 times. The shutdown is too frequent, and more flocculent shredded tobacco will be produced, causing the start-stop impact of the equipment. Therefore, it is very necessary to optimize the matching of the shredder and drying flow rates.
[0018] (2) Analysis of the current status of equipment start-up and shutdown before cutting: The investigation also found that the matching between the storage cabinet discharge and the shredded flow was also abnormal. The storage cabinet discharge flow was significantly greater than the shredded flow. On average, there were more than 4 equipment shutdowns in front of the shredded feeding bin per batch. In order to more accurately display the matching of the flow at the key nodes of the production line, the project team analyzed and sorted the survey data, as shown in Table 2.
[0019] Table 2 Data survey table on matching of cabinet discharge flow and shredded flow Step 2: Calculate the characterization parameters of the flow matching of tobacco leaves in the current batch, including: Step 2.1: Use formula (1) to obtain the actual weight percentage of tobacco leaves entering the cabinet η2: η2= M2 / M1(1) Step 2.2: Use formula (2) to obtain the actual weight-to-length ratio η3 of tobacco leaves entering the cabinet: η3= M2 / (M1×η1)(2) Step 2.3: Use formula (3) to obtain the tobacco leaf cutting and drying flow rate ratio η4: η4= FL1 / FL2(3) Step 2.4: Obtain the discharge flow index ω1 of the tobacco leaf storage cabinet by using Equation (4): ω1 = M2 × f × σ1 / (M1 × η1) (4) Step 2.5: Obtain the index ratio η5 of the cutting flow to the discharge flow of the tobacco leaf storage cabinet by using Equation (5): η5 = FL1 × M1 × η1 / (M2 × f × σ1) (5) Step 2.6: Without stopping the processing of the current batch by the cutting machine; obtain the discharge percentage η6 of the tobacco leaf storage cabinet when the cutting machine starts by using Equation (6): η6 = η1 - η7 (6) In Equation (6), η7 is the remaining percentage under the current batch; Step 2.7: When the drying machine starts, take the cumulative amount of the tobacco leaf passing through the electronic scale before the cutting machine as the cutting cumulative amount M3 under the current batch; Example: According to the above definitions and calculations, multiple characterization parameters of flow matching such as "actual weight percentage into the cabinet" are determined. The schematic diagrams of these characterization parameters are shown in Figure 1 the figure shown. For different batches of a brand name, an investigation and research on the effectiveness of the above relevant parameters are carried out. Taking the data of 9 batches of the previous investigation as an example, the flow matching characterization parameters are calculated through the known data and Formulas (1)-(6), and the obtained data are shown in Table 3.
[0020] Table 3 Summary table of flow matching parameters statistically based on actual production data Through the investigation and analysis of the above data, the following conclusions can be drawn: a. The actual amount into the cabinet of this brand name is less than the set percentage into the cabinet, so the weight-length ratio is less than 1; b. All are single-cabinet discharges; c. The cutting flow is much larger than the drying flow, and the average ratio is 1.25. Therefore, the cutting flow is excessive and the cutting machine stops frequently; d. For the two parameters of the storage cabinet discharge flow index and the index ratio of the cutting flow to the cabinet discharge flow, the one that can characterize the matching of the cabinet discharge flow and the cutting flow is the index ratio of the cutting flow to the cabinet discharge flow. As can be seen from the above data, when this parameter is larger, the number of stops of the equipment before cutting decreases, and when this parameter is smaller, the number of stops increases.
[0021] Step Three: Adjust the characterization parameters, including: the cutting flow FL1, the frequency f, the discharge percentage η6, and the cutting cumulative amount M3, so as to match the cutting flow FL1 and the drying flow FL2: Step 3.1: Under the current batch, set the cutting flow rate FL1 as follows to keep the feeding bin before drying in a state between medium level and full bin, and ensure that the feeding bin before the cutter and the cutter are always in operation; If, under the current batch, the feeding bin before drying is full and the cutter is stopped, gradually reduce the flow rate FL1 of the cutter until the cutter is kept in continuous operation; If, under the current batch, the level of the feeding bin before drying is too low and does not reach the detection switch at the medium level, that is, the supply of cut tobacco cannot meet the drying flow rate FL2, gradually increase the cutting flow rate FL1 so that while the cutter is in continuous operation, the feeding bin before drying is in a state between medium level and full bin, and set the corresponding cutting flow rate at this time as the theoretical optimal cutting flow rate FL1 * , and thus obtain the optimal cutting and drying flow rate ratio η4 of the tobacco leaves using Equation (3) * ; Example: Conduct further exploratory experiments and statistical analyses for the same brand name. To improve efficiency, test three batches in each step.
[0022] First, determine the direction of the experiment. To reduce the cutting and drying flow rate ratio and increase the cutting flow rate and the out-of-cabinet flow rate index ratio, find the best parameter matching. Then, conduct step-by-step tests.
[0023] In the first-step experiment, mainly achieve the flow rate matching between cutting and drying. Since the drying flow rate is a fixed value issued in the work order, reduce the cutting flow rate to achieve the best possible matching between the cutting and drying flow rates, as shown in Table 4.
[0024] Table 4 Investigation form of the cutting and drying flow rate matching in the first-step experiment Compared with the first three batches of the previous investigation, as follows Figure 3 shown, the start-stop times of the cutter in the experimental batches are significantly reduced, far less than those in the previous investigation. Therefore, by reducing the cutting flow rate to make the flow rates the same and the flow rate ratio 1.00, the situation of the cutter stopping can be significantly reduced, and the situation of the cutter stopping can be basically eliminated.
[0025] Step 3.2: Under the current batch, set the frequency f of the discharge bottom belt as follows to keep the feeding bin before cutting between medium level and full bin, and ensure that the feeding bin before cutting to the bottom belt of the storage cabinet is always in operation: If, under the current batch, the feeding bin before cutting is full and the discharge of the storage cabinet stops, gradually reduce the frequency f until the feeding bin before cutting is kept between medium level and full bin, and the feeding bin before cutting to the bottom belt of the storage cabinet is always in operation; If the material level in the feeding bin before cutting is too low and does not reach the detection switch of the medium material level, that is, the cigarette tobacco supply cannot meet the cutting flow rate FL1, then gradually increase the frequency f of the discharge bottom belt to keep the feeding bin before cutting between the medium material level and full bin, and the feeding bin before cutting and the bottom belt of the storage cabinet always remain in operation; and set the corresponding frequency of the discharge bottom belt at this time as the theoretical optimal bottom belt frequency f of the storage cabinet * , so as to obtain the optimal discharge flow index ω1 of the tobacco leaf storage cabinet by using formula (4) * ; Step 3.3: According to the optimal cutting and drying flow ratio η4 * and the optimal discharge flow index ω1 * , match the discharge flow of the storage cabinet with the theoretical optimal cutting flow rate FL1 * to make the obtained theoretical optimal cutting flow rate FL1 * match with the drying flow rate FL2 to achieve the dynamic matching of the flow rates in the cutting and drying processes, and record all the optimal values; Example: In the second step of the experiment, based on the results of the first step of the experiment, mainly find the matching between the out-of-cabinet flow rate and the cutting flow rate. Since there are differences in the weight of each batch entering the cabinet and the weight-length ratio is not completely consistent, by adjusting the frequency of the bottom belt of the storage cabinet, determine the appropriate out-of-cabinet flow index and the ratio of the cutting flow rate to the out-of-cabinet flow index to achieve the matching of the out-of-cabinet flow rate and the cutting flow rate. The experimental data is shown in Table 5
[0026] Table 5 Second-step experiment, investigation form on the matching situation of the discharge of the storage cabinet and the cutting flow rate Compared with the first three batches of the previous investigation, as follows Figure 4 shown, as the frequency of the discharge bottom belt decreases, the number of stops of the feeding bin in front of the cutting machine decreases significantly. Further, one more step of experiment is carried out for the project to confirm that the number of stops of the feeding bin can be minimized to the greatest extent. The experimental data is shown in Table 6
[0027] Table 6 Second-step experiment, investigation form on the matching situation of the discharge of the storage cabinet and the cutting flow rate under the condition of reducing the bottom belt frequency Compared with the number of stops of the equipment before cutting in the previous three batches and the three batches of the first experiment, as Figure 5 shown
[0028] At present, simply through the matching of flow rates, it is possible to achieve basically no downtime during the cutting process within a batch, and the equipment before cutting (including the feeding bin and the discharging part of the storage cabinet) does not stop operating at all. The initially tested parameters are as follows: the flow rate ratio of cutting to drying is 1.00, the flow rate index of the storage cabinet discharging is about 20.23, and the ratio of the cutting flow rate to the discharging flow rate index of the storage cabinet is about 252.09, which can achieve the purpose of adjusting the matching according to the parameter design.
[0029] Step 3.4: Determine the optimal discharging percentage η6 of the tobacco leaf storage cabinet when the cutting machine starts and the feeding bin before cutting is in a state between half-full and full. * : Record the discharging percentage η6 of the storage cabinet when the cutting machine starts. During the operation of the cutting machine according to the theoretical optimal cutting flow rate FL1 * : If, in the current batch, the material quantity in the feeding bin before cutting continuously decreases and even drops below half-full, then gradually increase the discharging percentage η6 of the storage cabinet when the cutting starts until the feeding bin before cutting is in a state between half-full and full within the entire batch. If, in the current batch, the material quantity in the feeding bin before cutting continuously increases and even approaches full or reaches full, then gradually decrease the discharging percentage η6 of the storage cabinet when the cutting starts until the feeding bin before cutting is in a state between half-full and full within the entire batch, and take the discharging percentage of the storage cabinet corresponding to the state when the feeding bin before cutting is in a state between half-full and full as the optimal discharging percentage η6. * ; Step 3.5: Determine the optimal cumulative cutting quantity M3 when the drying machine starts and the feeding bin before drying is in a state between half-full and full. * : Record the cumulative cutting quantity M3 when the drying machine starts. During the operation of the cutting machine according to the theoretical optimal cutting flow rate FL1 * : If, in the current batch, the material quantity in the feeding bin before drying continuously decreases and even drops below half-full, then gradually increase the cumulative cutting quantity M3 when the drying machine starts until the feeding bin before drying is in a state between half-full and full within the entire batch. If, in the current batch, the material quantity in the feeding bin before drying continuously increases and even approaches full or reaches full, then gradually decrease the cumulative cutting quantity M3 when the drying machine starts until the feeding bin before drying is in a state between half-full and full within the entire batch, and take the cumulative cutting quantity corresponding to the state when the feeding bin before drying is in a state between half-full and full as the optimal cumulative cutting quantity M3. * ; Example: For steps 3.4 and 3.5, conduct the third experiment. Based on the first two steps and going further, test the buffer data of the two feed bins. That is, when the two feed bins have different inventories and are not full, start the cutting and drying processes and test the operation of the production line. To make a comparison with the situation before the project was carried out, test the situation of 9 batches here. The specific data is shown in Table 7, and the comparison of the start-stop times is as follows Figure 6 。
[0030] Table 7 Investigation form of the flow matching situation in the cutting and drying process after comprehensively using the flow matching parameters From the above data statistics and analysis, it can be seen that by adjusting the flow rate of the cutting machine and the frequency of the bottom belt of the storage cabinet, as well as controlling the buffer volume of the two feed bins, it is possible to ensure that the production line of the pneumatic drying line does not stop during operation from startup to the end of the current batch.
[0031] Step 3.6: According to all the optimal values, use equations (3) and (4) to calculate the corresponding current optimal cutting flow rate FL1 ** and the frequency f of the current optimal bottom belt of the storage cabinet ** , which are used to control the running speeds of the cutting machine and the bottom belt of the storage cabinet on the cut tobacco production line to achieve the matching of the tobacco leaf flow rate on the production line.
[0032] Through the previous investigation and analysis, the important representative significance of the flow ratio of cutting and drying, the ratio of cutting flow rate to the out-of-cabinet flow rate index, the percentage of storage cabinet discharge at the start of cutting, and the cumulative cutting amount at the start of drying on the flow matching of the production line has been determined. At the same time, for the production of this batch, according to the previous conclusions, set the corresponding cutting flow rate and bottom belt frequency, and start the production line according to the corresponding percentage of storage cabinet discharge at the start of cutting and the cumulative cutting amount at the start of drying. Thus, the system can automatically calculate the appropriate cutting flow rate and the frequency of the out-of-cabinet bottom belt based on data such as the flow rate setting of drying and the actual material quantity of different batches. At the same time, it is optimized in the control system. According to the percentage of storage cabinet discharge and the cumulative cutting amount, it automatically prompts the central control to start cutting and drying respectively, further improving the accuracy and intelligence of production and increasing production efficiency. For the process described in the above text, see the specific process in Figure 2 。
[0033] By implementing the flow matching calculation and optimization method proposed in the present invention, the start-stop times and idling time of equipment on the production line can be significantly reduced, and production efficiency and stability can be improved. At the same time, due to the improvement of flow matching, flocculent cut tobacco and the impact of frequent equipment start-stop are eliminated, the cut tobacco quality and equipment health are effectively improved, and equipment safety is ensured. In addition, this method also has flexibility and scalability, and can be adjusted and optimized according to the actual situation of different production lines, providing strong support for the intelligent upgrade of the tobacco processing industry.
[0034] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.
Claims
1. A control method for the tobacco leaf flow matching of a cut tobacco production line, characterized in that, It includes the following steps: Step 1: Collect the storage capacity M1 of the tobacco leaf storage cabinet in the current batch on the cut tobacco production line in the cigarette making workshop, the percentage η1 of the length of the tobacco leaf entering the cabinet in the current batch, the actual weight M2 of the tobacco leaf entering the cabinet in the current batch, the single / double cabinet coefficient σ1, the frequency f of the discharge bottom belt of the tobacco leaf storage cabinet in the current batch, the cut tobacco flow rate FL1 of the cut tobacco machine in the current batch on the cut tobacco production line, and the cut tobacco drying flow rate FL2 of the cut tobacco dryer in the current batch. Step 2: Based on the data collected in Step 1, calculate the characterization parameters of the tobacco leaf flow rate matching in the current batch, including: the weight percentage η2 of the actual tobacco leaf entering the cabinet, the weight-length ratio η3 of the actual tobacco leaf entering the cabinet, the cut tobacco-dried tobacco flow rate ratio η4 of the tobacco leaf, the discharge flow rate index ω1 of the tobacco leaf storage cabinet, the index ratio η5 of the cut tobacco flow rate to the discharge flow rate of the tobacco leaf storage cabinet, the discharge percentage η6 of the tobacco leaf storage cabinet when the cut tobacco machine starts, and the cut tobacco cumulative amount M3 in the current batch. Step 3: Adjust the characterization parameters, including: the cut tobacco flow rate FL1, the frequency f, the discharge percentage η6, and the cut tobacco cumulative amount M3, so as to match the cut tobacco flow rate FL1 and the cut tobacco drying flow rate FL2.
2. The control method for the tobacco leaf flow matching of the cut tobacco production line according to claim 1, characterized in that, The said Step 2 includes: Step 2.1: Obtain the weight percentage η2 of the actual tobacco leaf entering the cabinet by using Equation (1): η2 = M2 / M1(1) Step 2.2: Obtain the weight-length ratio η3 of the actual tobacco leaf entering the cabinet by using Equation (2): η3 = M2 / (M1×η1)(2) Step 2.3: Obtain the cut tobacco-dried tobacco flow rate ratio η4 of the tobacco leaf by using Equation (3): η4 = FL1 / FL2(3) Step 2.4: Obtain the discharge flow rate index ω1 of the tobacco leaf storage cabinet by using Equation (4): ω1 = M2×f ×σ1 / (M1×η1)(4) Step 2.5: Obtain the index ratio η5 of the cut tobacco flow rate to the discharge flow rate of the tobacco leaf storage cabinet by using Equation (5): η5 = FL1×M1×η1 / (M2×f×σ1)(5) Step 2.6: Without stopping the processing of the current batch by the cut tobacco machine, obtain the discharge percentage η6 of the tobacco leaf storage cabinet when the cut tobacco machine starts by using Equation (6): η6 = η1 - η7(6) In Equation (6), η7 is the remaining percentage in the current batch; Step 2.7: When the cut tobacco dryer starts, take the cumulative amount of the tobacco leaf passing through the electronic scale before the cut tobacco machine as the cut tobacco cumulative amount M3 in the current batch.
3. The control method for the tobacco leaf flow matching of the cut tobacco production line according to claim 2, characterized in that, The said Step 3 includes: Step 3.1: In the current batch, set the cut tobacco flow rate FL1 as follows to keep the feed bin before cut tobacco drying in a state between medium level and full bin, and keep the feed bin before the cut tobacco machine and the cut tobacco machine always in an operating state; If the feed bin before cut tobacco drying is full and the cut tobacco machine is stopped in the current batch, gradually reduce the flow rate FL1 of the cut tobacco machine until the cut tobacco machine is kept in a continuous operating state; If the material level in the feeding bin before cut tobacco drying in the current batch is too low and does not reach the detection switch of the medium material level, that is, the cut tobacco supply cannot meet the drying flow rate FL2, the cut tobacco flow rate FL1 is gradually increased so that while the cut tobacco machine keeps running, the feeding bin before cut tobacco drying is in a state between the medium material level and full bin, and the corresponding cut tobacco flow rate at this time is set as the theoretical optimal cut tobacco flow rate FL1 * , and thus the optimal cut tobacco drying flow rate ratio η4 of the tobacco leaves is obtained by using formula (3) * ; Step 3.2: In the current batch, set the frequency f of the discharge bottom belt as follows to keep the feed bin before cut tobacco in a state between medium level and full bin, and keep the feed bin before cut tobacco to the storage cabinet bottom belt always in an operating state: If the feeding bin before cutting is full and the discharge of the storage cabinet stops during the current batch, gradually reduce the frequency f until the feeding bin before cutting maintains a material level between medium and full, and the conveyor belt from the feeding bin before cutting to the bottom of the storage cabinet always remains in operation; If the material level in the feeding bin before cutting is too low and does not reach the detection switch of the medium material level, that is, the cigarette tobacco supply cannot meet the cutting flow rate FL1, then gradually increase the frequency f of the discharge bottom belt to keep the feeding bin before cutting between the medium material level and full bin, and keep the feeding bin before cutting to the bottom belt of the storage cabinet running all the time; and set the corresponding frequency of the discharge bottom belt at this time as the theoretical optimal bottom belt frequency f of the storage cabinet * , so as to obtain the optimal discharge flow rate index ω1 of the tobacco leaf storage cabinet by using formula (4) * ; Step 3.3: According to the optimal cut tobacco and dried tobacco flow ratio η4 * and the optimal discharge flow index ω1 * , match the discharge flow of the storage cabinet with the theoretical optimal cut tobacco flow FL1 * to obtain the theoretical optimal cut tobacco flow FL1 * and match it with the dried tobacco flow FL2 to achieve dynamic flow matching of the cut tobacco and dried tobacco processes, and record all the optimal values; Step 3.4: Determine the optimal discharge percentage η6 of the tobacco leaf storage cabinet when the cutting machine starts and the feeding bin before cutting reaches a state between half-full and full * : Record the percentage η6 of the storage cabinet discharge at the start of the slicing machine. During the operation of the slicing machine according to the theoretical optimal slicing flow rate FL1 * : If the amount of material in the feeding bin before cutting continuously decreases and even drops below half bin during the current batch, gradually increase the discharge percentage η6 of the storage cabinet at the start of cutting until the feeding bin before cutting is in a state between half bin and full bin throughout the batch; If the material quantity in the feeding bin before cutting continuously increases in the current batch, even approaching or reaching the full bin state, then gradually reduce the storage bin discharge percentage η6 at the start of cutting until the feeding bin before cutting is in a state between half-full and full within the entire batch, and use the storage bin discharge percentage corresponding to the state where the feeding bin before cutting is between half-full and full as the optimal discharge percentage η6 * ; Step 3.5: Determine the optimal cumulative cutting amount M3 when the cut tobacco dryer starts and the feeding bin before cut tobacco drying reaches a state between half-full and full * : Record the cumulative cutting amount M3 when the cut tobacco dryer starts. During the operation of the cutter according to the theoretical optimal cutting flow rate FL1 * : If the amount of material in the feeding bin before drying continuously decreases and even drops below half bin during the current batch, gradually increase the cumulative cutting amount M3 at the start of the dryer until the feeding bin before drying is in a state between half bin and full bin throughout the batch; If the amount of materials in the feeding bin before cut tobacco drying in the current batch continues to increase, even approaching or reaching full capacity, gradually reduce the cumulative cut amount M3 at the start of the cut tobacco dryer until the feeding bin before cut tobacco drying in the entire batch is between half full and full, and use the cumulative cut amount corresponding to the state between half full and full of the feeding bin before cut tobacco drying as the optimal cumulative cut amount M3 * ; Step 3.6: Calculate the corresponding current optimal cut tobacco flow rate FL1 using Equation (3) and Equation (4) based on all the optimal values ** and the frequency f of the current optimal bottom belt of the storage cabinet ** , which are used to control the operating speeds of the cut tobacco machine and the bottom belt of the storage cabinet on the cut tobacco production line to achieve the matching of the tobacco leaf flow rate of the production line.
4. An electronic device, comprising a memory and a processor, characterized in that, The memory is used to store a program that supports the processor in executing any one of the control methods recited in claims 1-3, and the processor is configured to execute the program stored in the memory.
5. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is run by the processor, it executes the steps of any one of the control methods recited in claims 1-3.