A method and system for continuous feeding of a tobacco cutter

Abstract

The application discloses a continuous feeding method and feeding system of a tobacco leaf cutter, and the feeding method comprises the following steps: when the material level in the limiting tube is higher than the middle material level photoelectric tube, the cutter is started to run; the lifting belt runs at a preset frequency f0; when the material level in the limiting tube is lowered to be lower than the middle material level photoelectric tube within t1, the lifting belt runs at a frequency which is increased by a first increment Δf1 per second, until the material level is higher than the middle material level photoelectric tube and lower than the high material level photoelectric tube, and returns to step S200; when the material level in the limiting tube is higher than the middle material level photoelectric tube and lower than the high material level photoelectric tube at time t1, the lifting belt runs at a frequency which is decreased by a second increment Δf2 per second, until the material level is lower than the middle material level photoelectric tube, and then runs at a frequency which is increased by the first increment Δf1 per second, until the material level is higher than the middle material level photoelectric tube, and returns to step S200. The application has the advantages that the material in the limiting tube can be stably kept near the middle material level photoelectric tube, the continuous running of the feeding process is ensured, and the start-stop times of the lifting belt and the feeding vibrating trough are reduced.

Description

Technical Field

[0001] This invention relates to the field of tobacco processing technology, and more specifically, to a continuous feeding method and feeding system for a tobacco leaf shredder. Background Technology

[0002] Tobacco leaf processing equipment is a crucial component of tobacco production, with the shredder being its core part. The stable operation of the feeding system during shredding is essential for ensuring high-quality shredded tobacco. However, due to various reasons, the feeding system of the shredder may experience malfunctions, causing significant losses to tobacco production. Therefore, maintaining the stability of the feeding system is of paramount importance.

[0003] The current feeding system of the shredder controls the start-up and operation of the shredder and the start-up and stop of the feeding belt and feeding trough by installing two photocells in the shredder's limiting tube. Although this achieves automatic control of tobacco leaf supply, the frequent start-up and stop of the equipment results in a failure rate of components such as motors and transmission chains that is much higher than that of other continuously operating equipment. Summary of the Invention

[0004] To solve at least one of the above-mentioned technical problems, the present invention provides a continuous feeding method and feeding system for a tobacco leaf shredder. After the shredder is started and running, the operating frequency of the lifting belt is controlled by the material level in the limiting tube, so that the material level in the limiting tube is stabilized near the middle material level limiting tube, thereby feeding the shredder evenly and stably.

[0005] The present invention solves the technical problem by adopting the following technical solution:

[0006] A continuous feeding method for a tobacco leaf shredder, the feeding method comprising the following steps:

[0007] S100. When the material level in the limiting tube is higher than that in the middle material level photoelectric tube, the shredder starts running.

[0008] S200, the lifting belt operates at a preset frequency f0;

[0009] S300: When the lifting belt runs at a preset frequency f0 for a time within t1, and the material level in the limiting tube drops below the middle material level phototube, the lifting belt runs at a frequency that increases by the first increment Δf1 per second until the material level is higher than the middle material level phototube and lower than the high material level phototube, then returns to step S200.

[0010] S400. When the lifting belt runs at a preset frequency f0 to time t1, and the material level in the limiting tube is higher than the middle material level phototube but lower than the high material level phototube, the lifting belt runs at a frequency that decreases by a second increment Δf2 per second until the material level is lower than the middle material level phototube. Then, it runs at a frequency that increases by a first increment Δf1 per second until the material level is higher than the middle material level phototube, and returns to step S200.

[0011] Furthermore, the feeding method also includes: when the material level in the limiting tube is higher than that in the high material level phototube, the lifting belt operates at a frequency of decreasing the third increment Δf3 per second;

[0012] When the lifting belt decreases the third increment Δf3 per second within t2, and the material level in the limiting tube decreases to below the high material level photocell but above the medium material level photocell, return to step S200.

[0013] When the lifting belt runs at a frequency decreasing by the third increment Δf3 per second until time t2, and the material level in the limiting tube is higher than that of the high-level photoelectric tube, the feeding trough is stopped, and the frequency of the lifting belt drops to 0.

[0014] Furthermore, the feeding method also includes: when the feeding trough is stopped and the frequency of the lifting belt drops to 0, the shredder continues to run; when the material level in the limiting tube drops below the high material level phototube and above the middle material level phototube, the process returns to step S200.

[0015] Furthermore, step S100 specifically includes:

[0016] S101 When the material level in the limiting tube is lower than the low material level phototube, the feeding vibratory trough runs and the lifting belt runs at a frequency of f1 until the material level in the limiting tube is higher than the middle material level phototube.

[0017] S102. When the material level in the limiting tube is higher than that in the middle material level photoelectric tube, the shredder starts running.

[0018] S103. The frequency of the booster belt is adjusted from f1 to the preset frequency f0, where f1 > f0.

[0019] Furthermore, the frequency f1 is set to one of 48-50Hz; the preset frequency f0 is set to one of 40-46Hz.

[0020] Furthermore, the time t1 is set to one of 3-8s; the first increment Δf1 and the second increment Δf2 are set to one of 0.2-0.5Hz.

[0021] Furthermore, time t2 is set to one of 8-15s; the third increment Δf3 is set to one of 1-3Hz.

[0022] Furthermore, a continuous feeding system for a tobacco leaf shredder is provided, applicable to the feeding method described above. The feeding system includes a conveying device and a controller. The conveying device includes a lifting belt, a feeding trough, a limiting tube, and a shredder arranged sequentially from upstream to downstream. The limiting tube is equipped with a high-level photoelectric tube, a medium-level photoelectric tube, and a low-level photoelectric tube arranged sequentially from top to bottom. The lifting belt, the feeding trough, the shredder, the high-level photoelectric tube, the medium-level photoelectric tube, and the low-level photoelectric tube are all electrically connected to the controller.

[0023] Furthermore, the distance between the low-level phototube and the bottom of the limiting tube is 35%-45% of the height of the limiting tube, the distance between the medium-level phototube and the low-level phototube is 8%-10% of the height of the limiting tube, and the distance between the high-level phototube and the medium-level phototube is 12%-18% of the height of the limiting tube.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] (1) This feeding method can stabilize the material in the limiting tube near the middle material level photoelectric tube, which can provide uniform and continuous feeding to the shredder, ensure the continuous operation of the feeding process during production, and improve the shredding quality.

[0026] (2) It reduces the number of times the lifting belt and the feeding trough are started and stopped, which solves the problems of increased wear, increased temperature and reduced efficiency of motor and chain caused by frequent start and stop, thus extending the service life of the equipment and reducing the downtime rate. Attached Figure Description

[0027] To better understand the above and other objects, features, advantages, and functions of the present invention, reference can be made to the embodiments shown in the accompanying drawings. The same reference numerals in the drawings refer to the same parts. Those skilled in the art should understand that the drawings are intended to schematically illustrate preferred embodiments of the invention and do not limit the scope of the invention in any way; the parts in the drawings are not drawn to scale.

[0028] Figure 1 This is a flowchart of the continuous feeding method for the tobacco leaf shredder of the present invention.

[0029] Figure 2 This is a schematic diagram of the continuous feeding system of the tobacco leaf shredder of the present invention.

[0030] In the diagram: 1- Silo feeder; 2- Lifting belt; 3- Feeding vibrating trough; 4- Limiting tube; 41- High material level photocell; 42- Medium material level photocell; 43- Low material level photocell; 5- Shredder; 6- Discharge vibrating trough; 7- Electrical control cabinet. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, exemplary embodiments of this disclosure are described below with reference to the accompanying drawings, including various details of the embodiments to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this disclosure. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0032] This invention provides a continuous feeding method for a tobacco leaf shredder 5, such as... Figure 1 As shown, the feeding method includes the following steps:

[0033] S100. When the material level in the limiting tube 4 is higher than the middle material level photoelectric tube 42, the shredder 5 starts to run.

[0034] S200, the lifting belt 2 operates at a preset frequency f0;

[0035] S300: When the lifting belt 2 runs at a preset frequency f0 for a time within t1, and the material level in the limiting tube 4 drops below the middle material level phototube 42, the lifting belt 2 runs at a frequency that increases by the first increment Δf1 per second until the material level is higher than the middle material level phototube 42 and lower than the high material level phototube 41, then returns to step S200.

[0036] S400. When the lifting belt 2 runs at a preset frequency f0 to time t1, and the material level in the limiting tube 4 is higher than the middle material level phototube 42 and lower than the high material level phototube 41, the lifting belt 2 runs at a frequency that decreases by a second increment Δf2 per second until the material level is lower than the middle material level phototube 42. Then, it runs at a frequency that increases by a first increment Δf1 per second until the material level is higher than the middle material level phototube 42, and returns to step S200.

[0037] During production, tobacco leaves are conveyed by the elevator belt 2 to the high-level feeding trough 3, and then conveyed to the limiting tube 4. The limiting tube 4 then feeds the tobacco leaves to the shredder 5. The shredder 5 is automatically controlled. To ensure shredding quality, the shredder 5 automatically starts operating when the material level in the limiting tube 4 is higher than the middle material level photoelectric tube 42. After the shredder 5 starts operating, the elevator belt 2 runs at a preset frequency f0.

[0038] When the shredder 5 starts running, the material level in the limiting tube 4 is higher than that in the middle material level photoelectric tube 42, and the operating frequency of the lifting belt 2 is a preset frequency f0. As the lifting belt 2 and the feeding trough 3 upstream of the limiting tube 4 convey material into the limiting tube 4, and simultaneously the limiting tube 4 conveys material to the shredder 5 downstream, the material level in the limiting tube 4 changes. When the material conveyed to the limiting tube 4 is less than the material output from the limiting tube 4 to the shredder 5, the material level in the limiting tube 4 decreases; when the material conveyed to the limiting tube 4 is more than the material output from the limiting tube 4 to the shredder 5, the material level in the limiting tube 4 increases; when the material conveyed to the limiting tube 4 is equal to the material output from the limiting tube 4 to the shredder 5, the material level in the limiting tube 4 remains stable.

[0039] In one embodiment, when the material level in the limiting tube 4 drops rapidly, and within a preset running time of 5 seconds, the material level in the limiting tube 4 falls below the middle material level photocell 42, it indicates that the material supply to the limiting tube 4 is too slow, and the material conveying speed of the lifting belt 2 needs to be increased. At this time, the lifting belt 2 operates at a frequency of 0.2Hz / s, starting from a preset frequency f0. For example, when the middle material level photocell 42 detects that the material level in the limiting tube 4 has dropped below the middle material level photocell 42, the frequency of the lifting belt 2 decreases from f0 to f0-0.2. After 1 second, the frequency of the lifting belt 2 further decreases from f0-0.2 to f0-0.4. In sequence, the frequency of the lifting belt 2 decreases by 0.2Hz per second until the material level is higher than the middle material level photocell 42 and lower than the high material level photocell 41. Then, the process returns to step S200, adjusts the frequency of the lifting belt 2 to the preset frequency f0, and repeats steps S200-S400.

[0040] When the lifting belt 2 runs at a preset frequency f0 for 5 seconds, and the material level in the limiting tube 4 is still higher than the middle material level phototube 42 but lower than the high material level phototube 41, the material level in the limiting tube 4 gradually rises. To prevent the material level from rising above the high material level phototube 41, the lifting belt 2 decreases its frequency by 0.2 Hz / s from the preset frequency f0 until the material level is lower than the middle material level phototube 42. Then, it increases its frequency by 0.2 Hz / s until the material level is higher than the middle material level phototube 42. Then, it returns to step S200, adjusts the frequency of the lifting belt 2 to the preset frequency f0, and repeats steps S200-S400.

[0041] In this way, the material level in the limiting tube 4 can be kept relatively stable near the middle material level photoelectric tube 42, thereby providing uniform and continuous material supply to the shredder 5, ensuring the continuous and stable operation of the material supply process during production, and improving the shredding quality. This reduces the number of starts and stops of the lifting belt 2 and the feeding vibrating trough 3, solving the problems of increased wear, increased temperature, and reduced efficiency of the motor and chain caused by frequent starts and stops, thus extending the service life of the equipment and reducing the downtime rate.

[0042] It is understandable that the frequency of the lifting belt 2 is the frequency of the drive motor of the lifting belt 2, which is a variable frequency motor and its frequency can be adjusted as needed. When the material level photocell in the limiting tube 4 is blocked by material, it is determined that the material level in the limiting tube is higher than that material level photocell; when the material level photocell is not blocked by material, it is determined that the material level in the limiting tube is lower than that material level photocell. For example, when the middle material level photocell 42 is blocked by material, it is determined that the material level in the limiting tube is higher than that middle material level photocell 42; when the middle material level photocell 42 is not blocked by material, it is determined that the material level in the limiting tube is lower than that middle material level photocell 42.

[0043] The preset frequency f0, time t1, first increment Δf1, and second increment Δf2 can be set to appropriate values ​​according to the on-site production conditions to stabilize the material level of the limiting tube 4 near the middle material level photoelectric tube 42, avoiding excessively rapid or large fluctuations in the material level. The preset frequency f0 is set to one of 40-46Hz, for example, f0 can be set to 40Hz, 41Hz, 42Hz, 43Hz, 44Hz, 45Hz, or 46Hz. The time t1 is set to one of 3-8s, for example, t1 can be set to 3s, 4s, 5s, 6s, 7s, or 8s. The first increment Δf1 and second increment Δf2 are set to one of 0.2-0.5Hz, for example, Δf1 and Δf2 can be set to 0.2Hz, 0.3Hz, 0.4Hz, or 0.5Hz. The first increment Δf1 and second increment Δf2 can be set to different values ​​or the same value.

[0044] Before the shredder 5 starts shredding production, there is basically no material in the limiting tube 4, and the low-level photocell 43 detects that the material level in the limiting tube 4 is lower than that of the low-level photocell 43. In order to quickly deliver material into the limiting tube 4, step S100 specifically includes:

[0045] S101, when the material level in the limiting tube 4 is lower than the low material level photoelectric tube 43, the feeding vibrating trough 3 runs, and the lifting belt 2 runs at a frequency f1 until the material level in the limiting tube 4 is higher than the middle material level photoelectric tube 42.

[0046] S102. When the material level in the limiting tube 4 is higher than the middle material level photoelectric tube 42, the shredder 5 starts to run.

[0047] S103, the frequency of boost band 2 is adjusted from f1 to the preset frequency f0, where f1 > f0.

[0048] To enable the shredder 5 to start quickly, the frequency f1 is set to one of 48-50Hz, for example, 48Hz, 49Hz, or 50Hz. The rated frequency of the drive motor for the lifting belt 2 is generally 50Hz, so setting the frequency f1 to 50Hz is even better. This allows the lifting belt 2 to run at high speed, quickly conveying materials and ensuring that the material level in the measuring tube 4 quickly reaches the starting condition of the shredder 5, thereby improving production efficiency.

[0049] When the feeding of material from the lifting belt 2 and the feeding trough 3 to the limiting tube 4 fluctuates and the feeding is unstable, too much material is instantaneously conveyed to the limiting tube 4, causing the material level in the limiting tube 4 to be higher than that of the high material level photoelectric tube 41. Alternatively, when the lifting belt 2 runs at a preset frequency f0 for time t1, if the material level in the limiting tube 4 is still higher than that of the medium material level photoelectric tube 42 and higher than that of the high material level photoelectric tube 41, the material level in the limiting tube 4 rises too quickly, which can easily lead to the risk of material blockage.

[0050] To prevent overfeeding from causing blockage in the limiting tube 4 and resulting in production failure, the feeding method further includes: when the material level in the limiting tube 4 is higher than the high-level photoelectric tube 41, the lifting belt 2 operates at a frequency that decreases by a third increment Δf3 per second to reduce the conveying speed of the lifting belt 2 and decrease the feeding speed to the limiting tube 4. Specifically, when the lifting belt 2 operates at a frequency that decreases by a third increment Δf3 per second for a period of time t2, and the material level in the limiting tube 4 decreases to a level lower than the high-level photoelectric tube 41 but higher than the middle-level photoelectric tube 42, the process returns to step S200; when the lifting belt 2 operates at a frequency that decreases by a third increment Δf3 per second for a period of time t2, and the material level in the limiting tube 4 is higher than the high-level photoelectric tube 41, the feeding trough 3 is stopped, and the frequency of the lifting belt 2 is reduced to 0.

[0051] In one embodiment, when the material level in the limiting tube 4 is higher than that in the high-level phototube 41, the lifting belt 2 operates at a reduced frequency of 1 Hz / s. When, within a preset operating time of 10 seconds, the material level in the limiting tube 4 drops below that in the high-level phototube 41 but above that in the medium-level phototube 42, it indicates that the material level in the limiting tube 4 is rapidly decreasing, eliminating the risk of material blockage. At this point, the process returns to step S200, and the frequency of the lifting belt 2 is adjusted to a preset frequency f0, and steps S200-S400 are executed cyclically.

[0052] When the lifting belt 2 operates at a reduced frequency of 1Hz / s for 10s, and the material level in the limiting tube 4 is still higher than that in the high-level photoelectric tube 41, it indicates that the speed at which the material is being conveyed to the limiting tube 4 is still too fast and the material level in the limiting tube 4 cannot be reduced in time within 10s. It is determined that a blockage has occurred, and it is necessary to stop the operation of the feeding vibrating trough 3, reduce the frequency of the lifting belt 2 to 0, stop the lifting belt 2 from conveying, and thus stop the material supply to the limiting tube 4.

[0053] When the feeding trough 3 is stopped and the frequency of the lifting belt 2 drops to 0, the shredder 5 continues to run, and the material in the limiting tube 4 continues to be conveyed to the shredder 5. When the material level in the limiting tube 4 drops below the high material level phototube 41 and above the middle material level phototube 42, the process returns to step S200. The frequency of the lifting belt 2 is adjusted from 0 to the preset frequency f0, the lifting belt 2 is started, and after running at the preset frequency f0, steps S200-S400 are executed in a loop.

[0054] The time t2 and the third increment Δf3 can be set to appropriate values ​​according to the on-site production conditions, so that the material level of the limiting tube 4 can be reduced to below the high-level photoelectric tube 41 in a timely manner under normal circumstances, eliminating the risk of material blockage and reducing the start and stop of the lifting belt 2 and the feeding vibrating trough 3. Preferably, the time t2 is set to one of 8-15s, for example, the time t2 can be set to 8s, 9s, 10s, 11s, 12s, 13s, 14s or 15s, etc. The third increment Δf3 is set to one of 1-3Hz, for example, the third increment Δf3 can be set to 1Hz, 1.5Hz, 2Hz, 2.5Hz or 3Hz, etc.

[0055] This invention also provides a continuous feeding system for a tobacco leaf shredder 5, applicable to the feeding methods described above, such as... Figure 2 As shown, the feeding system includes a conveying device and a controller. The conveying device includes a lifting belt 2, a feeding vibrating trough 3, a limiting tube 4, and a shredder 5 arranged sequentially from upstream to downstream. The limiting tube 4 is equipped with a high-level photoelectric tube 41, a medium-level photoelectric tube 42, and a low-level photoelectric tube 43 arranged sequentially from top to bottom. The lifting belt 2, the feeding vibrating trough 3, the shredder 5, the high-level photoelectric tube 41, the medium-level photoelectric tube 42, and the low-level photoelectric tube 43 are all electrically connected to the controller.

[0056] The production process of this feeding system is as follows: Qualified tobacco leaves are transported by belt conveyor to the bin-type feeder 1. Once the amount of tobacco leaves in the bin-type feeder 1 reaches the production requirement, the downstream shredder 5 and its feeding equipment are started. The tobacco leaves are conveyed by the elevator belt 2 to the high-level feeding trough 3, and then to the limiting tube 4. The limiting tube 4 then conveys the tobacco leaves to the shredder 5. After shredding, the shredder 5 conveys the tobacco leaves to the discharge trough 6, and then to the downstream process. When the height of the tobacco leaves in the limiting tube 4 is higher than the middle material level photoelectric tube 42, the controller controls the shredder 5 to start shredding production. After the shredder 5 starts running, the controller controls the elevator belt 2 to operate at a variable frequency according to the material level in the limiting tube 4, so that the material level in the limiting tube 4 is stabilized near the middle material level photoelectric tube 42. When material blockage occurs, the material level in the limiting tube 4 is higher than the high-level photoelectric tube 41. The high-level photoelectric tube 41 sends a blockage signal to the controller, which then controls the frequency of the lifting belt 2 to decrease to 0 and stops the feeding vibrating trough 3 from operating. The controller can be located in the electrical control cabinet 7. As needed, parameters such as frequency f1, preset frequency f0, time t1, time t2, first increment Δf1, second increment Δf2, and third increment Δf3 can be adjusted on the electrical control cabinet 7.

[0057] In one embodiment, the distance between the low-level phototube and the bottom of the limiting tube is 35%-45% of the height of the limiting tube, the distance between the medium-level phototube and the low-level phototube is 8%-10% of the height of the limiting tube, and the distance between the high-level phototube and the medium-level phototube is 12%-18% of the height of the limiting tube. For example, the height of the limiting tube 4 is set to H. The distance between the low-level photoelectric tube 43 and the bottom of the limiting tube 4 can be set to 35%H, 36%H, 37%H, 38%H, 39%H, 40%H, 41%H, 42%H, 43%H, 44%H, or 45%H, etc. The distance between the medium-level photoelectric tube 42 and the low-level photoelectric tube 43 can be set to 8%H, 9%H, or 10%H, etc. The distance between the high-level photoelectric tube 41 and the medium-level photoelectric tube 42 can be set to 12%H, 13%H, 14%H, 15%H, 16%H, 17%H, or 18%H, etc. Appropriate placement of each photoelectric tube allows the adjustment of the frequency of the lifting belt 2 to adapt to the feeding requirements of the shredder 5.

[0058] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A continuous feeding method for a tobacco leaf shredder, characterized in that, The feeding method includes the following steps: S100. When the material level in the limiting tube is higher than that in the middle material level photoelectric tube, the shredder starts running. S200, the lifting belt operates at a preset frequency f0; S300: When the lifting belt runs at a preset frequency f0 for a time within t1, and the material level in the limiting tube drops below the middle material level phototube, the lifting belt runs at a frequency that increases by the first increment Δf1 per second until the material level is higher than the middle material level phototube and lower than the high material level phototube, then returns to step S200. S400. When the lifting belt runs at a preset frequency f0 to time t1, and the material level in the limiting tube is higher than the middle material level phototube but lower than the high material level phototube, the lifting belt runs at a frequency that decreases by a second increment Δf2 per second until the material level is lower than the middle material level phototube. Then, it runs at a frequency that increases by a first increment Δf1 per second until the material level is higher than the middle material level phototube, and returns to step S200.

2. The continuous feeding method for a tobacco leaf shredder according to claim 1, characterized in that, The feeding method further includes: when the material level in the limiting tube is higher than the high material level phototube, the lifting belt operates at a frequency of decreasing the third increment Δf3 per second. When the lifting belt decreases the third increment Δf3 per second within t2, and the material level in the limiting tube decreases to below the high material level photocell but above the medium material level photocell, return to step S200. When the lifting belt runs at a frequency decreasing by the third increment Δf3 per second until time t2, and the material level in the limiting tube is higher than that of the high-level photoelectric tube, the feeding trough is stopped, and the frequency of the lifting belt drops to 0.

3. The continuous feeding method for a tobacco leaf shredder according to claim 2, characterized in that, The feeding method further includes: when the feeding trough is stopped and the frequency of the lifting belt drops to 0, the shredder continues to run; when the material level in the limiting tube drops below the high material level phototube and above the medium material level phototube, the process returns to step S200.

4. The continuous feeding method for a tobacco leaf shredder according to claim 1, characterized in that, Step S100 specifically includes: S101 When the material level in the limiting tube is lower than the low material level phototube, the feeding vibratory trough runs and the lifting belt runs at a frequency of f1 until the material level in the limiting tube is higher than the middle material level phototube. S102. When the material level in the limiting tube is higher than that in the middle material level photoelectric tube, the shredder starts running. S103. The frequency of the booster belt is adjusted from f1 to the preset frequency f0, where f1 > f0.

5. The continuous feeding method for a tobacco leaf shredder according to claim 4, characterized in that, The frequency f1 is set to one of 48-50Hz; the preset frequency f0 is set to one of 40-46Hz.

6. The continuous feeding method for a tobacco leaf shredder according to claim 1, characterized in that, The time t1 is set to one of 3-8s; the first increment Δf1 and the second increment Δf2 are set to one of 0.2-0.5Hz.

7. The continuous feeding method for a tobacco leaf shredder according to claim 2, characterized in that, The time t2 is set to one of 8-15s; the third increment Δf3 is set to one of 1-3Hz.

8. A continuous feeding system for a tobacco leaf shredder, characterized in that, The feeding method applicable to any one of claims 1-7, the feeding system includes a conveying device and a controller, the conveying device including a lifting belt, a feeding vibrating trough, a limiting tube and a shredder arranged sequentially from upstream to downstream; the limiting tube is provided with a high-level photoelectric tube, a medium-level photoelectric tube and a low-level photoelectric tube arranged sequentially from top to bottom; the lifting belt, the feeding vibrating trough, the shredder, the high-level photoelectric tube, the medium-level photoelectric tube and the low-level photoelectric tube are all electrically connected to the controller.

9. The continuous feeding system for a tobacco leaf shredder according to claim 8, characterized in that, The distance between the low-level phototube and the bottom of the limiting tube is 35%-45% of the height of the limiting tube; the distance between the medium-level phototube and the low-level phototube is 8%-10% of the height of the limiting tube; and the distance between the high-level phototube and the medium-level phototube is 12%-18% of the height of the limiting tube.

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