An automatic precise tobacco feeding system and method

Abstract

The application discloses a kind of tobacco leaf automatic precision feeding system and method, it is related to tobacco processing technical field.System includes buffer feeding machine, static weighing device, conveying device and control device, and buffer feeding machine is equipped with climbing loose device inside.Control device receives the weight signal of static weighing device, when weight reaches preset threshold, buffer feeding machine is suspended and material is released to conveying device, simultaneously according to target flow, single feeding quantity and conveying device length adjusts conveying speed, realizes mass flow closed-loop control.The application is through the synergistic effect of static weighing and intelligent speed regulation feeding, with high measurement accuracy and continuous production capacity, and can be linked along the direction of conveying Multiple sets of feeding system, through collaborative control realizes the on-line layering of multiple materials Paving and preliminary premixing.

Description

Technical Field

[0001] This invention relates to the field of tobacco processing technology, and more specifically, to an automatic and precise feeding system and method for tobacco leaves, which is particularly suitable for the automatic and precise proportioning and feeding of tobacco leaves in the tobacco re-drying pretreatment stage and the layering and premixing of multiple varieties of tobacco leaves. Background Technology

[0002] In the tobacco re-drying pretreatment stage, the core task is to strictly and precisely proportion tobacco leaves of different origins, grades, and years according to the industrial formula, and then put them into the production line to ensure the sensory quality and homogeneous stability of chemical components of the subsequent processed products.

[0003] Currently, the vast majority of tobacco re-drying plants in China still use a manual leaf-laying and bundling method in this stage. This involves workers manually laying various weights of tobacco leaves onto a conveyor belt at a constant speed, based on their senses and according to the formula requirements, forming the initial flow of tobacco materials. The accuracy of the proportions depends entirely on manual operation, making it difficult to achieve precise feeding that meets the formula's requirements. As the industry's requirements for product quality stability continue to increase, this manual feeding method has become a bottleneck restricting the intelligent manufacturing upgrade and homogenized production level of the tobacco re-drying pretreatment section.

[0004] Existing technologies also include solutions combining manual or mechanical material spreading with weighing: multiple workstations pre-distribute tobacco leaves onto a metering belt using manual labor or spreading equipment, weigh them all at once, and then release them onto a unified conveyor line. However, this method is mostly intermittent and involves synchronous conveying at different points on a single conveyor belt, resulting in poor homogenization. Furthermore, some solutions use electronic belt scales for dynamic weighing, but dynamic belt scales are prone to errors due to interference factors such as vibration, humidity, and uneven material distribution, making it difficult to guarantee measurement accuracy. Summary of the Invention

[0005] The purpose of this invention is to provide an automatic and precise tobacco leaf feeding system and method to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, the present invention provides an automatic and precise tobacco leaf feeding system, which includes a buffer feeder, a static weighing device, a conveying device, and a control device, wherein: A buffer feeder, located at the front end of the system, receives and temporarily stores tobacco leaves. The discharge end of the buffer feeder connects to the inlet end of the static weighing device. The buffer feeder contains an inclined loosening device to disperse and organize the tobacco leaves entering it, ensuring they fall into the static weighing device in a uniform and loose state. Figure 2As shown, a preferred embodiment of the climbing loosening device includes a conveyor belt, a leveling roller, and toothed hook plates. One end of the conveyor belt is connected to the discharge end of the buffer feeder, and the other end of the conveyor belt is connected to a static weighing device. Multiple evenly distributed toothed hook plates are fixedly installed on the conveyor belt. The leveling roller is rotated and installed above the conveyor belt. The leveling roller and the toothed hook plates match to disperse and straighten the tobacco material on the conveyor belt. When the tobacco material moves on the conveyor belt with the toothed hook plates, the clumps of tobacco leaves are naturally loosened and separated under the mechanical turning and gravity action through the cooperation of the leveling roller and the toothed hook plates, creating a good material form for subsequent accurate weighing.

[0007] A static weighing device, whose feed end is connected to the discharge end of a buffer feeder, is used to receive and weigh the tobacco material conveyed by the buffer feeder. The static weighing device includes a weighing hopper and a weighing sensor. The weighing hopper is mounted on the weighing sensor, and the feed end of the weighing hopper is connected to the discharge end of the buffer feeder. The weighing sensor can perform high-precision weighing of the weighing hopper and the tobacco material inside it in a static and undisturbed environment.

[0008] Conveying device: Located below the static weighing device, it is used to receive the tobacco material released by the static weighing device and transport it to downstream equipment.

[0009] Control device: Connected to the buffer feeder, static weighing device and conveying device respectively, to realize the automatic control of the system.

[0010] The present invention also provides a method for automatic and precise feeding of tobacco leaves, the method comprising the following steps: S100. The tobacco leaves enter the buffer feeder. Through its internal climbing and loosening device, the tobacco leaves that may clump together are broken up and straightened, so that they fall into the static weighing device below in a uniform and loose state. This creates a good material shape for accurate weighing. The climbing and loosening device lifts and turns the tobacco leaves through the toothed hook plates set on the conveyor belt. Combined with the crushing and combing action of the uniform roller, the clumps of tobacco leaves are naturally loosened and separated. S200: The material continues to accumulate in the weighing hopper. The weighing sensor performs high-precision weighing of the weighing hopper and its internal material in a static and interference-free environment. When the weight of the tobacco material reaches the preset single feeding threshold, the control device immediately issues a command to pause the upstream buffer feeder, and the metering stage is completed. S300: Based on the preset target flow rate, the single feeding amount of the static weighing device, and the length of the conveying device, the operating speed of the conveying device is adjusted and controlled to ensure that the tobacco material in the static weighing device is completely and evenly spread onto the conveying device, thereby achieving real-time closed-loop control of the mass flow rate of the tobacco material. This is specifically expressed by the formula: In the formula, This indicates the pre-set target traffic volume. This indicates the amount of material fed into the static weighing device in a single operation. Indicates the operating speed of the conveyor device. Indicates the length of the conveying device. Indicates the length of movement of tobacco leaf material on the conveying device. Time required; S400: The control device releases the tobacco material from the weighing hopper onto the conveying device by controlling the opening and closing mechanism of the weighing hopper. The key to this process is the seamless coordination between the activation timing of the static weighing device and the movement position of the conveying device. The control device determines whether the current feeding section of the conveying device is empty; once it can accommodate new material, it immediately activates the static weighing device, ensuring that the tobacco material is completely and evenly spread across a length of [length missing]. On the conveyor section, a uniform "material strip" is formed.

[0011] Among them, the conveying device operates at the calculated speed. During operation and conveying, this weight, determined by static weighing, is... within the rated time Complete the rated length inside This enables real-time closed-loop control of tobacco leaf mass flow rate; Once the material in the static weighing device has been completely released and the device is shut off, the control device will restart the buffer feeder to begin the next weighing cycle.

[0012] Therefore, this feeding method, through reasonable buffer silo design and rapid weighing and feeding cycle, can achieve perfect connection of multiple working cycles and present a continuous material flow to the outside world.

[0013] This invention also provides a method for premixing tobacco leaf layering materials, specifically including: Along the conveying direction of the conveying device, the above-mentioned multiple feeding systems can be set up in parallel. That is, multiple buffer feeders, multiple static weighing devices corresponding to each buffer feeder, and multiple conveying devices are set up in parallel along the conveying direction. Each feeding system independently completes the weighing and feeding of a material.

[0014] When different types of tobacco leaves (such as those from different origins and grades) are sequentially fed onto the same conveyor line using their respective equipment, a precise layering effect is achieved, with each layer overlapping the previous one. The control device independently controls the feeding sequence and single-bucket weight of each feeding system, ensuring that different types of tobacco leaves are fed onto the conveyor line composed of multiple conveying devices in a predetermined order. This creates multiple layers of material on the conveyor line, allowing for the proportional mixing of tobacco leaves of different specifications and achieving online premixing.

[0015] Compared with existing technologies, the automatic precision tobacco feeding system provided by this invention achieves full automation and precise control of the tobacco feeding process through the coordinated use of static weighing and intelligent speed-regulating feeding. The static weighing device fundamentally eliminates the measurement errors caused by vibration, humidity, and material impact from dynamic belt scales, significantly improving the proportioning accuracy. Simultaneously, by organically combining static weighing with intelligent speed-regulating conveying, it breaks the traditional limitation of intermittent static weighing, achieving continuous and uninterrupted material output while ensuring high precision, thus balancing accuracy and efficiency. The system automatically calculates and adjusts the conveying speed based solely on the weight of a single bucket and the target flow rate, transforming precise weight measurement into precise flow control. The control logic is simple, reliable, and highly resistant to interference. Furthermore, the front-end inclined loosening device effectively handles tobacco leaves prone to clumping, ensuring that the material entering the weighing stage is uniformly loose, improving the system's adaptability to tobacco leaves of different characteristics. In terms of functional expansion, this system can be easily arranged in series with multiple units. By coordinating the feeding sequence of multiple feeding systems, it can directly complete the layering and preliminary premixing of various materials on the same conveyor line, simplifying the subsequent mixing process and saving equipment and site investment. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the automatic and precise tobacco feeding system of the present invention.

[0018] Figure 2 This is a schematic diagram of the buffer feeder in this invention.

[0019] Figure 3 This is a schematic diagram of the connection structure between the static weighing device and the conveying device in this invention.

[0020] Figure 4 This is a schematic diagram of the structure of multiple feeding systems arranged in parallel to achieve layered premixing of materials in this invention.

[0021] Figure 5 This is a flowchart of an automatic and precise tobacco leaf feeding method according to the present invention.

[0022] In the diagram: 100. Buffer feeder, 110. Conveyor belt, 120. Scale roller, 130. Toothed hook plate, 140. Storage bin, 200. Static weighing device, 210. Weighing hopper, 220. Weighing sensor, 300. Conveying device. Detailed Implementation

[0023] To make the objectives, technical solutions, and technical effects of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings, multiple embodiments, and comparative examples. In the following description, the same components are referred to by the same reference numerals.

[0024] Example 1 like Figures 1-3 As shown, this embodiment provides an automatic precision tobacco feeding system, including a buffer feeder 100, a static weighing device 200, a conveying device 300, and a control device (not shown in the figure), wherein: The buffer feeder 100 is located at the front end of the system and is used to receive and temporarily store tobacco leaf materials. The buffer feeder 100 is equipped with an incline loosening device, which includes a conveyor belt 110, a leveling roller 120, and a toothed hook plate 130. One end of the conveyor belt 110 is connected to the discharge end of the buffer feeder 100, and the other end of the conveyor belt 110 is connected to the static weighing device 200. Multiple evenly distributed toothed hook plates 130 are fixedly installed on the conveyor belt 110. The leveling roller 120 is rotatably installed above the conveyor belt 110, and multiple leveling teeth are fixedly installed on the leveling roller 120. The leveling roller 120 disperses and straightens the tobacco leaf materials on the conveyor belt 110 by matching the leveling teeth with the toothed hook plates 130.

[0025] After the tobacco leaves enter the buffer feeder 100, they first fall onto the conveyor belt 110. The toothed hook plate 130 lifts and turns the tobacco leaves. When the tobacco leaves pass under the leveling roller 120, the leveling teeth on the leveling roller 120 cooperate with the toothed hook plate 130 to crush and comb the tobacco leaves. This causes the clumps of tobacco leaves to naturally loosen and separate under the action of gravity and mechanical turning, falling into the static weighing device 200 below in a uniform and loose state. This preliminary sorting step ensures that the material entering the weighing stage is in a uniform state, avoiding weighing errors caused by material clumping.

[0026] The static weighing device 200 includes a weighing hopper 210 and a weighing sensor 220. The weighing hopper 210 is mounted on the weighing sensor 220, and the feed end of the weighing hopper 210 is connected to the discharge end of the buffer feeder 100. The weighing hopper 210 is equipped with an opening and closing mechanism (not shown in the figure), which is controlled by a control device to perform opening and closing actions. The weighing sensor 220 can perform high-precision weighing of the weighing hopper 210 and the tobacco material inside it in a static and undisturbed environment.

[0027] The conveying device 300 is located directly below the static weighing device 200 and is used to receive all the materials released by the static weighing device 200 and transport the materials to downstream equipment. In this embodiment, the conveying device 300 is preferably a speed-regulating belt conveyor.

[0028] The control device is connected to the buffer feeder 100, the static weighing device 200 (including the weighing sensor 220 and the opening and closing mechanism), and the conveying device 300. The control device receives the weight signal of the weighing hopper 210 and the tobacco material inside it detected by the weighing sensor 220. When the weight of the tobacco material reaches the preset single feeding threshold, the control device immediately issues a command to stop the buffer feeder 100 and issues an opening command to the opening and closing mechanism, so that the tobacco material in the weighing hopper 210 is released onto the conveying device 300. At the same time, the control device adjusts the feeder according to the preset target flow rate. Single feeding volume of static weighing device and the length of the conveying device Calculate the operating speed of the conveyor device And control it to run at that speed.

[0029] Before issuing the opening command for the opening and closing mechanism, the control device first determines whether the current feeding section of the conveyor 300 has been emptied. If it has been emptied, the static weighing device 200 is immediately activated, ensuring that the tobacco material in the entire weighing hopper 210 is completely and evenly spread on a length of [missing information]. On the conveyor section, a uniform strip of material is formed.

[0030] After the tobacco material in the static weighing device 200 is completely released and closed, the control device controls the buffer feeder 100 to restart and perform the next weighing cycle.

[0031] Example 2 like Figure 5 As shown, this embodiment provides a method for automatically and accurately feeding tobacco leaves using the above-mentioned feeding system, including the following steps: S100: Preliminary Preparation The tobacco leaves are fed into the buffer feeder 100, where an incline loosening device inside the buffer feeder 100 breaks up and straightens the tobacco leaves, ensuring they are transported to the static weighing device in a uniform and loose state. Specifically, the incline loosening device lifts and turns the tobacco leaves using toothed hook plates 130 on the conveyor belt 110, which, combined with the crushing and combing action of the leveling roller 120, causes the clumps of tobacco leaves to naturally loosen and separate under the action of gravity and mechanical turning.

[0032] S200: Static Precision Measurement The tobacco leaf material continuously accumulates in the static weighing device 200, and the weighing sensor 220 weighs the weighing hopper 210 and the tobacco leaf material inside it in real time under static conditions. When the weight of the tobacco leaf material reaches the preset single feeding amount threshold, the control device controls the buffer feeder 100 to stop feeding, and the metering stage is completed.

[0033] S300: Intelligent Linked Feeding and Real-time Conveying Based on a pre-set target traffic The single feeding amount of the static weighing device 200 and the length of the conveyor device 300 The operating speed of the conveying device 300 is adjusted and controlled to ensure that the tobacco material in the static weighing device 200 is completely and evenly spread on the conveying device 300, thereby achieving real-time closed-loop control of the mass flow rate of the tobacco material. Before issuing the start command, the control device first determines whether the current feeding section of the conveying device 300 has been emptied. Once it is confirmed that it can accommodate new material, the static weighing device 200 is immediately started.

[0034] This step can be expressed by the following formula: In the formula, This indicates the pre-set target flow rate (i.e., the flow rate of tobacco material on the conveying device 300 per unit time). This indicates the amount of material fed into the static weighing device in a single operation. Indicates the operating speed of the conveyor device. Indicates the length of the conveying device. Indicates the length of movement of tobacco leaf material on the conveying device. Time required.

[0035] The conveying device strictly follows the calculated speed During operation, the weight is determined by static weighing during the conveying process. At the rated time Complete the rated length inside This enables real-time closed-loop control of tobacco leaf mass flow rate.

[0036] S400: Continuous Cycle Once the material in the static weighing device 200 is completely released and the device is closed, the control device restarts the buffer feeder 100 to begin the next weighing cycle. Through a well-designed buffer silo and a rapid weighing and feeding cycle, multiple work cycles are seamlessly connected, resulting in a continuous flow of material.

[0037] Example 3 This embodiment provides a method for premixing layered tobacco leaves based on the above-described system. This method is implemented using multiple parallel feeding systems, specifically as follows: Figure 4 As shown.

[0038] Along the conveying direction of the conveying device, multiple feeding systems are arranged in parallel, including multiple buffer feeding machines 100, multiple static weighing devices 200 corresponding to each buffer feeding machine, and multiple conveying devices 300. Each feeding system constitutes a feeding station arranged sequentially along the conveying direction. Each feeding system independently completes the weighing and feeding of a type of tobacco leaf material. Each feeding system independently executes the automatic and precise feeding method described in Example 2. For example, the first feeding system feeds tobacco leaves from region A, the second feeding system feeds grade B tobacco leaves, and the third feeding system feeds tobacco leaves from year C.

[0039] The control device coordinates the feeding sequence and weight of tobacco leaves in each feeding system, ensuring that different types of tobacco leaves are sequentially fed onto a conveyor line composed of multiple conveying devices 300 according to a predetermined ratio and order. Specifically, after the first type of tobacco leaf forms a uniform strip on the conveyor device 300, the second type of tobacco leaf is precisely laid on top of the first strip as the conveyor line moves forward, forming a second layer of material; and so on, with subsequent tobacco leaves layered on top, thus forming multiple layers of material on the conveyor line. By precisely controlling the weight of each hopper and the timing of feeding in each feeding system, the proportional mixing of tobacco leaves of different specifications can be achieved, realizing online premixing.

[0040] The aforementioned layered premixing method is particularly suitable for initially mixing tobacco leaves from different origins, grades, or years according to a formula ratio, laying the foundation for subsequent homogenization processing. The parallel arrangement of multiple feeding systems not only enables independent feeding through multiple channels but also allows for the direct layering and initial premixing of various materials on the same conveyor line through coordinated control, simplifying subsequent blending processes and saving on equipment and space investment.

[0041] It should be noted that the multiple conveying devices 300 can be a single integrated structure or multiple separate structures connected in series.

[0042] Example 4 In a preferred embodiment of the present invention, the climbing loosening device operates as follows: The conveyor belt 110 is arranged at an inclination, with its lower end located at the feed inlet side of the storage bin 140 and its upper end located at the feed end side of the static weighing device 200. The toothed hook plate 130 is perpendicular to the conveyor belt, and the movement direction of 110 is uniformly fixed on the surface of the conveyor belt 110.

[0043] When the tobacco leaves enter the conveyor belt 110 from the storage bin 140, the toothed hook plate 130 lifts the tobacco leaves upward in the inclined direction as the conveyor belt 110 moves.

[0044] When the tobacco leaves are lifted to the upper part of the conveyor belt 110, they need to pass through the leveling roller 120, which is set at a predetermined height above the conveyor belt 100. The gap between the leveling roller 120 and the surface of the conveyor belt 110 can be adjusted according to the characteristics of the tobacco leaves. When the tobacco leaves pass under the leveling roller 120, the leveling roller 120 applies a certain pressure to the tobacco leaves, which, together with the lifting action of the toothed hook plate 130, breaks up and combs the clumps of tobacco leaves.

[0045] After being processed by the equalizing roller 120 and the toothed hook plate 130, the tobacco leaf material falls from the discharge end of the conveyor belt 110 into the static weighing device 200 below in a uniform and loose state. The entire process is continuous, ensuring the consistency and uniformity of the material state entering the weighing stage.

[0046] To further verify the actual operating effect of the automatic and precise tobacco feeding system of the present invention, this embodiment provides operating data when the above system is used in actual production operations.

[0047] At a re-drying plant, the automatic and precise tobacco feeding system described in Embodiment 1 of this invention was used for feeding operations. A target flow rate was set. The flow rate was 1283.88 kg / min. The system automatically calculates and controls the operating speed of the conveying device based on the single feed amount and the length of the conveying device. During continuous operation, the system recorded the real-time flow rate at each time point, and the specific data is shown in Table 1.

[0048]

[0049] As shown in Table 1, during continuous operation for several hours, the system set the flow rate to a constant 1283.88 kg / min, while the real-time flow rate fluctuated between 1282.12 kg / min and 1284.43 kg / min. Throughout the entire operating cycle, the real-time flow rate closely followed the set value, with minimal deviation and stable fluctuations, without any significant cumulative deviation or trend drift. The data fully demonstrates that this invention, through static weighing and intelligent speed-regulating feeding control, can stably control the feeding flow rate near the target value over a long period, achieving high-precision real-time closed-loop control of tobacco material mass flow rate. Even under long-term continuous operation conditions, the system maintains good control accuracy and operational stability, fully meeting the stringent requirements for proportioning accuracy in the tobacco re-drying pretreatment stage.

[0050] Furthermore, the time span of the data records shows that the system ran continuously from 00:32 to 05:54 without any production interruption due to material accumulation or flow interruption. This indicates that the invention performs excellently in terms of the coordination of weighing and feeding action rhythms, with smooth connection between each work cycle, presenting a continuous and stable material flow output to the outside world, thus verifying the continuous operation capability of the invention.

[0051] The above provides a detailed description of an automatic precision tobacco feeding system and method provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are merely for the purpose of helping to understand the core ideas of this application. It should be noted that those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this application.

Claims

1. An automatic and precise tobacco leaf feeding system, characterized in that, include: A buffer feeder, located at the front end of the system, is used to receive and temporarily store tobacco leaf materials. A static weighing device, whose feed end is connected to the discharge end of the buffer feeder, is used to receive and weigh the tobacco material conveyed by the buffer feeder. The conveying device, located below the static weighing device, is used to receive the tobacco material released by the static weighing device and transport it to downstream equipment; The control device is connected to the buffer feeder, the static weighing device, and the conveying device, respectively. The control device is configured to: receive the weight signal of the tobacco material inside the static weighing device; when the weight of the tobacco material reaches the preset single feeding weight threshold, pause the buffer feeder and send a release command to the static weighing device so that all the tobacco material inside the static weighing device is released onto the conveying device; at the same time, according to the preset target flow rate, the single feeding amount of the static weighing device and the length of the conveying device, adjust and control the running speed of the conveying device so that the tobacco material is evenly spread on the conveying device, thereby realizing automatic and accurate feeding of tobacco.

2. The automatic precision feeding system for tobacco leaves according to claim 1, characterized in that, The buffer feeder is equipped with a ramping and loosening device, which is used to break up and straighten the tobacco material entering the buffer feeder so that it falls into the static weighing device in a uniform and loose state.

3. The automatic precision feeding system for tobacco leaves according to claim 2, characterized in that, The climbing and loosening device includes a conveyor belt, a leveling roller, and toothed hook plates. One end of the conveyor belt is connected to the discharge end of the buffer feeder, and the other end of the conveyor belt is connected to a static weighing device. Multiple evenly distributed toothed hook plates are fixedly installed on the conveyor belt. The leveling roller is rotated and installed above the conveyor belt. The leveling roller and the toothed hook plates match each other to disperse and straighten the tobacco material on the conveyor belt.

4. The automatic precision feeding system for tobacco leaves according to claim 3, characterized in that, The static weighing device includes a weighing hopper and a weighing sensor. The weighing hopper is mounted on the weighing sensor, and the feed end of the weighing hopper is connected to the discharge end of the buffer feeder.

5. The automatic precision feeding system for tobacco leaves according to claim 1, characterized in that, The control device is also configured to: after the tobacco material in the static weighing device is completely released into the conveying device, shut off the discharge of the static weighing device and control the buffer feeder to restart for the next weighing cycle.

6. The automatic precision feeding system for tobacco leaves according to claim 1, characterized in that, Along the conveying direction of the conveying device, multiple buffer feeders, multiple static weighing devices corresponding to each buffer feeder, and multiple conveying devices are arranged in parallel. Each feeding system independently completes the weighing and feeding of a type of material. The control device independently controls the feeding sequence of each feeding system, so that different types of tobacco leaf materials are sequentially fed onto the conveying line composed of multiple conveying devices to form a multi-layered material layer.

7. A method for automatically and accurately feeding tobacco leaves using the feeding system described in any one of claims 1-5, characterized in that, The method includes the following steps: S100. The tobacco leaf material is fed into the buffer feeder. The climbing and loosening device inside the buffer feeder breaks up and straightens the tobacco leaf material, so that the tobacco leaf is conveyed to the weighing device in a uniform and loose state. S200: The tobacco material continuously accumulates in the static weighing device and is weighed in real time under static conditions. When the weight of the tobacco material reaches the preset single feeding weight threshold, the control system controls the buffer feeder to stop feeding. S300: Based on the preset target flow rate, the single feeding amount of the static weighing device and the length of the conveying device, adjust and control the operating speed of the conveying device so that the tobacco material in the static weighing device is completely and evenly spread on the conveying device, thereby realizing real-time closed-loop control of the mass flow rate of the tobacco material. S400. After the material in the static hopper scale is completely released and the scale is closed, the control device controls the buffer feeder to start again for the next weighing cycle.

8. The automatic and precise feeding method for tobacco leaves according to claim 7, characterized in that, The specific formula for step S300 is as follows: In the formula, This indicates the pre-set target traffic volume. This indicates the amount of material fed into the static weighing device in a single operation. Indicates the operating speed of the conveyor device. Indicates the length of the conveying device. Indicates the length of movement of tobacco leaf material on the conveying device. Time required.

9. A method for premixing layered tobacco leaves using the feeding system described in claim 6, characterized in that, include: Multiple feeding systems are arranged sequentially along the conveying direction of the conveying device, and each feeding system independently completes the weighing and feeding of a type of material; Each feeding system independently executes the automatic and precise feeding method as described in claim 7; The control device coordinates the feeding sequence and weight of tobacco leaves in each feeding system, so that different types of tobacco leaves are fed into the conveyor line composed of multiple conveying devices in a predetermined order. This forms a multi-layered material layer on the conveyor line, which completes the proportional mixing of tobacco leaves of different specifications and realizes online premixing.

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