Method for improving uniformity of small recipe cut tobacco blending

Abstract

The method for improving the blending uniformity of small formula cut tobacco is carried out in a cut tobacco blending device, and the cut tobacco blending device comprises a first feeder, a second feeder, a computer combined scale, an excitation spreader, a tracking spreader, a mixed cut tobacco belt and a controller. The first feeder is above the second feeder. The inlet end of the computer combined scale is located at the outlet end of the second feeder, and the outlet end of the computer combined scale is above the excitation spreader. The front end of the tracking spreader is below the rear end of the excitation spreader. The tracking spreader is above the mixed cut tobacco belt. The controller is connected with the computer combined scale, a transverse excitation motor, a longitudinal excitation motor, an auxiliary material belt motor, a surplus material recovery belt, a pre-filling detector and a cut tobacco in-place detector. The method for improving the blending uniformity of small formula cut tobacco comprises cut tobacco feeding, flow splitting, excitation spreading, tracking spreading and surplus material recovery.

Description

Technical Field

[0001] This invention relates to the blending process of tobacco processing lines in cigarette factories, which improves the uniformity of blending small-volume tobacco components in the finished tobacco formula and belongs to the field of tobacco cigarette processing technology. Background Technology

[0002] Cigarette formulations are made by mixing various raw materials in different proportions. Blending the tobacco on the cigarette manufacturing line is a crucial process before flavoring. Different brands of finished tobacco have different compositions. According to process requirements, different components such as main tobacco leaves, modular tobacco leaves, stems, sheet tobacco, and expanded tobacco are blended evenly in their respective proportions to ensure the consistency of the tobacco formulation across different production batches of the same brand. As tobacco processing becomes increasingly refined, the uniformity of blending and the precision of the proportions of various tobacco components directly affect the stability of the finished cigarette's intrinsic quality and style.

[0003] The blending and mixing section of the tobacco processing workshop consists of a blending belt conveyor (hereinafter referred to as the blending belt) and a constant flow control system for each blended tobacco shred. In the tobacco industry, the combination of a feeder, metering tube, and electronic belt scale (hereinafter referred to as the electronic scale) is the most widely used flow control mode, representing a two-stage quantitative control based on both volume and mass. In this mode, the feeder ensures continuous material supply with a stable and uniform material layer width and height. The metering tube is installed between the feeder outlet and the electronic scale belt surface, serving to limit volume and buffer material. After passing through the metering tube cavity, the material forms a roughly rectangular and relatively regular continuous layer on the downstream electronic scale conveyor belt surface. The electronic scale performs mass quantitative control; the load cell weighs the continuous material layer on the belt surface in real time. By precisely controlling the conveyor belt speed via frequency conversion, the weight of the material passing through the weighing area per unit time is kept constant, thereby achieving the goal of controlling the material flow rate. Therefore, the combination of the feeder, metering tube, and electronic scale is also called a constant flow control system.

[0004] The most widely used equipment layout in the blending section of a tobacco processing line is that the constant flow control system for each blended tobacco shred is vertically connected to the blending belt. Each blended tobacco shred (such as stem shreds, modular leaf shreds, thin sheet shreds, expanded shreds, etc.) enters its respective constant flow control system, is weighed by an electronic scale, and then falls onto the main tobacco shreds continuously conveyed by the blending belt, thereby achieving the proportional blending and mixing of each tobacco shred component with the main tobacco shreds.

[0005] When the proportion of blended tobacco shreds in the formula of a particular brand of tobacco shreds is very small, the above method has the following problems:

[0006] First, the flow rate of the blended tobacco (or small-component blend) is much lower than that of the main tobacco (typically less than 1000 kg / h, sometimes even as low as tens to hundreds of kg / h). Under these conditions, the electronic scale operates at a very low speed, causing the blended tobacco to fall intermittently into the mixing belt. Since the main tobacco on the mixing belt is continuously fed, the mixing of the small-component tobacco into the main tobacco is discontinuous, resulting in very poor uniformity of the flow rate of the small-component tobacco along the time axis.

[0007] Secondly, the material feeding method of the electronic scale is material layer section feeding. Although the upstream has passed the volume limit of the metering tube, so that the shape of the material on the electronic scale conveyor belt surface is a rectangular and relatively regular continuous material layer from a macroscopic point of view, the two sides of the material layer and the surface are uneven and fluctuate from a microscopic point of view, and it is impossible for it to be a perfect rectangle in theory.

[0008] Furthermore, the weighing principle of electronic scales is to maintain a constant weight of material passing through the weighing area per unit time through frequency conversion of belt speed. Therefore, the conveyor belt speed of electronic scales is constantly being adjusted. When material leaves the conveyor belt of electronic scales, the material layer collapses purely due to gravity. It is precisely because of the microscopic inhomogeneity of the material layer and the dynamic changes in the material layer's movement speed that the weight of the material falling in each collapse is actually unpredictable and uncontrollable.

[0009] When the flow rate of the tobacco blending process is large, the material flow appears stable and continuous on a macroscopic scale. However, when the flow rate of the tobacco blending process is small, the above phenomenon is particularly prominent. Not only is the flow rate of the small-formulation tobacco very poorly distributed along the time axis, but the uniformity of the weight of the material falling with each electronic scale is also very poor.

[0010] Secondly, the width of the blending section in the tobacco processing line is typically 1000mm to 1200mm. The constant flow control system for each blended tobacco is usually perpendicularly connected to the blending section, and the feeding area of ​​the electronic scale is typically 400mm to 600mm in the width direction of the blending section. When the flow rate of the blended tobacco is very low, the feeding area of ​​the smaller blend materials will converge even narrower, resulting in poor uniformity of the distribution of the smaller blend tobacco in the width direction of the main tobacco.

[0011] In summary, the blending of small-component (or small-group) tobacco using the current traditional process equipment configuration of tobacco processing lines has defects such as poor uniformity of flow distribution along the time axis, poor uniformity of material weight, and poor uniformity of blended tobacco distribution. The macroscopic phenomenon is that the small-component tobacco is discontinuous, irregular, and unevenly distributed on the main tobacco material layer of the blended tobacco.

[0012] Therefore, it is necessary to design a process and system that can improve the uniformity of blending small-component (or small-component) tobacco shreds. Summary of the Invention

[0013] The purpose of this invention is to address the numerous problems existing in existing tobacco blending technologies by providing a method and system for improving the uniformity of blending small-formula or small-group tobacco.

[0014] To achieve the purpose of this invention, the following technical solution is adopted:

[0015] This invention discloses a method for improving the uniformity of blending small-component tobacco shreds. The method is performed in a tobacco blending device, which includes: a first feeder, a second feeder, a computer-controlled combined scale, an excitation spreader, a tracking spreader, a blending tape, and a controller. The first feeder is located above the second feeder. The inlet of the computer-controlled combined scale is located at the outlet of the second feeder, and its outlet is located above the excitation spreader. The front end of the tracking spreader is located below the rear end of the excitation spreader, and the tracking spreader is located above the blending tape. The excitation spreader includes: a frame, a shock absorber, a trough, a transverse excitation motor, and a longitudinal excitation motor. The trough is fixed to the frame, the shock absorber is mounted on the frame, and the transverse and longitudinal excitation motors are respectively mounted on the trough. The vibration of the transverse excitation motor causes the material on it to be evenly distributed along the width direction of the trough, and the vibration of the longitudinal excitation motor causes the material on it to be evenly distributed along the length direction of the trough. The tracking spreader includes: The system consists of a guide rail, a material spreading conveyor belt, a residual material recovery belt, a hanging frame, a material spreading machine frame, a material spreading belt motor, a pre-filling detector, and a tobacco shred arrival detector. The guide rail is fixed above the mixing belt and at the rear end of the trough. The material spreading conveyor belt and the residual material recovery belt are fixed to the material spreading machine frame. One end of the hanging frame is fixed to the material spreading machine frame, and the other end is fixed to the guide rail via a connector. The pre-filling detector is mounted on the material spreading machine frame above the rear end of the material spreading conveyor belt, and the tobacco shred arrival detector is mounted on the material spreading machine frame below the rear end of the material spreading conveyor belt. The material spreading conveyor belt is driven by the material spreading belt motor and is located directly below the trough. The residual material recovery belt is located below the trough. The controller is connected to the computer-controlled combined scale, the horizontal excitation motor, the vertical excitation motor, the material spreading belt motor, the residual material recovery belt, the pre-filling detector, and the tobacco shred arrival detector. The width of the trough, the width of the material spreading conveyor belt, and the width of the mixing belt are the same. The method for improving the uniformity of blending small-formula tobacco shreds includes the following steps:

[0016] (I) Tobacco feeding

[0017] Small-component or small-group tobacco shreds are sequentially fed to the inlet of the computer-controlled combined scale by the first and second feeders to ensure continuous, stable and uniform feeding.

[0018] (II) Traffic Splitting

[0019] The computer-controlled combination scale divides the flow rate (kg / h) of tobacco shreds into smaller batches based on the process flow rate of the small formula or small batch. The computer-controlled combination scale adopts a constant frequency feeding mode, which divides the blending flow rate (kg / h) into several equal small flow rate packages according to the running time of the blending belt. Then, the small flow rate packages are fed into the tank in sequence at equal time intervals.

[0020] (III) Vibration spreading

[0021] The transverse excitation motor vibrates at a high frequency and low amplitude to spread the small flow package material evenly along the width of the trough each time it falls in, while the longitudinal excitation motor vibrates at a high frequency and low amplitude to spread the small flow package material evenly along the length of the trough each time it falls in, so that the small flow package material is evenly transported to the spreading conveyor belt.

[0022] (IV) Tracking the laying of materials

[0023] Small-flow-rate material is conveyed along the spreading conveyor belt. When the pre-filling detector detects small-flow-rate material on the spreading conveyor belt, but the tobacco shred arrival detector does not detect tobacco shreds on the mixed-line belt, the controller controls the computer-controlled combined scale, the lateral excitation motor, the longitudinal excitation motor, and the spreading conveyor belt to stop running. When the pre-filling detector detects small-flow-rate material on the spreading conveyor belt, and the tobacco shred arrival detector detects tobacco shreds on the mixed-line belt, the controller starts the computer-controlled combined scale, the lateral excitation motor, the longitudinal excitation motor, and the spreading conveyor belt. The running speed of the spreading conveyor belt is the same as the belt speed of the mixed-line belt.

[0024] (V) Waste Material Recycling

[0025] After each batch of production is completed, the controller stops the feeding belt motor, the lateral excitation motor, and the longitudinal excitation motor, loosens the connector on the lifting frame, and moves the lifting frame away along the guide rail, so that the feeding conveyor belt leaves the trough. The residual material recycling belt is located below the trough. Then, the lifting frame is fixed on the guide rail, and the residual material recycling belt, the lateral excitation motor, and the longitudinal excitation motor are turned on, so that the residual material in the computer combination scale is sent to the residual material recycling belt through the trough to reduce the loss of small flow package materials.

[0026] The present invention provides a method for improving the uniformity of blending small-component tobacco shreds, wherein: the first feeder is a feeder and the second feeder is a conveyor belt.

[0027] The present invention provides a method for improving the uniformity of blending small-component tobacco shreds, wherein: the computer-controlled combined scale divides the flow rate into 10g / s to 500g / s; the weighing accuracy of the computer-controlled combined scale for quantitative weighing is within ±0.5g to ±1g.

[0028] The present invention provides a method for improving the uniformity of blending small-formula tobacco, wherein: the trough is inclined downward along the material conveying direction of the small-flow pack, and its inclination angle is 1° to 5°.

[0029] The present invention provides a method for improving the uniformity of blending small-formula tobacco shreds, wherein: the material spreading conveyor belt is inclined downward along the material conveying direction of the small-flow pack, and its inclination angle is 1° to 5°.

[0030] The present invention provides a method for improving the uniformity of blending small-formula tobacco shreds, wherein the motor of the spreading belt is a variable frequency motor.

[0031] The key technical features of this invention—flow rate splitting, vibratory spreading, and tracking spreading—are technically interconnected and interact with each other, not independent. These technical features are not simply superimposed combinations, but rather interact and influence each other, collectively playing a crucial role in improving the uniformity of blending small-component tobacco shreds. Each step is indispensable. Therefore, it should be viewed as a holistic system; the aforementioned key steps cannot be used in isolation, otherwise the beneficial effects of this invention will not be achieved.

[0032] The beneficial effect of the method for improving the uniformity of blending small-component tobacco shreds according to the present invention is that the flow splitting in step (ii), the vibratory spreading in step (iii), and the tracking spreading in step (iv) are technically interconnected and interactive, not independent. The technical features are not simply superimposed combinations, but rather interact and influence each other, collectively playing a role in improving the uniformity of blending small-component tobacco shreds in the technical solution; none can be omitted. Therefore, it should be viewed as a whole system, and the above key steps should not be used in isolation; otherwise, the beneficial effects brought by the present invention cannot be achieved. They improve the uniformity of blending small-component or small-group tobacco shreds in the main tobacco shreds. By adopting the technical methods of flow splitting, vibratory spreading, and tracking spreading, they progressively influence each other.

[0033] This method first replaces the electronic belt scale in the tobacco processing process with a computer-controlled combined scale. Through a constant frequency feeding mode, the flow rate of small-component tobacco blending is subdivided into several equally spaced portions along the time axis, which greatly improves the uniformity of the flow rate of small-component or small-group tobacco along the time axis. The computer-controlled combined scale uses a permutation and combination algorithm to ensure the target feeding weight value. The blending accuracy of small-component tobacco can be improved from 0.5% using the traditional electronic scale process to 0.1%, thereby greatly improving the consistency and uniformity of the feeding weight.

[0034] Secondly, the high-frequency vibration of the vibratory paver in both longitudinal and transverse directions ensures that the material dropped by the computer-controlled scale is evenly spread across the width of the vibratory paver's trough. The width of the vibratory paver's trough is comparable to the width of the tracking paving machine's conveyor belt, and the width of the paving machine's conveyor belt is the same as the effective width of the blending belt. This significantly increases the contact area between the small-component tobacco and the main tobacco during blending, allowing the small-component tobacco to be evenly layered on top of the main tobacco layer.

[0035] Finally, the tracking feeder has the functions of pre-filling blended tobacco shreds, tracking the speed of the blended tape, and detecting the arrival of the main tobacco shreds on the blended tape, making the timing of blending more precise and controllable.

[0036] The uniformity of blending using this method is 10% to 15% higher than that of traditional processes. This effectively improves the processing precision and process control capabilities of cigarettes, which is beneficial to the stability of the internal quality and style of the finished cigarettes. Attached Figure Description

[0037] Figure 1 This is a plan view of the apparatus used in a method for improving the uniformity of blending small-component tobacco shreds according to the present invention.

[0038] exist Figure 1 In the diagram, number 1 is the first feeder; number 2 is the second feeder; number 3 is the computer-controlled combination scale; number 4 is the vibrating spreader; number 5 is the tracking spreader; number 6 is the mixing belt; number 7 is the...; number 41 is the frame; number 42 is the shock absorber; number 43 is the trough; number 44 is the transverse vibrating motor; number 45 is the longitudinal vibrating motor; number 51 is the guide rail; number 52 is the spreading conveyor belt; number 53 is the residual material recycling belt; number 54 is the hanging frame; number 55 is the spreading machine frame; number 56 is the spreading belt motor; number 57 is the pre-filling detector; and number 58 is the tobacco shred arrival detector. Detailed Implementation

[0039] like Figure 1As shown, the tobacco blending device of the present invention includes: a first feeder 1, a second feeder 2, a computer-controlled combined scale 3, an excitation spreader 4, a tracking spreader 5, a blending belt 6, and a controller 7. The first feeder 1 is a feeder, and the second feeder 2 is a conveyor belt. The first feeder 1 is located above the second feeder 2. The inlet end of the computer-controlled combined scale 3 is located at the outlet end of the second feeder 2, and its outlet end is located above the excitation spreader 4. The computer-controlled combined scale 3 divides the flow rate into 10g / s to 500g / s. The weighing accuracy of the computer-controlled combined scale 3 is within ±0.5g to ±1g. The front end of the tracking spreader 5 is located below the rear end of the excitation spreader 4, and the tracking spreader 5 is located above the mixing ribbon 6. The excitation spreader 4 includes: a frame 41, a shock absorber 42, a trough 43, a transverse excitation motor 44, and a longitudinal excitation motor 45. The trough 43 is fixed on the frame 41, the shock absorber 42 is mounted on the frame 41, and the transverse excitation motor 44 and the longitudinal excitation motor 45 are respectively mounted on the trough 43. The vibration of the transverse excitation motor 44 causes the material on it to be evenly distributed along the width direction of the trough 43, and the longitudinal excitation motor 45 is evenly distributed along the width direction of the trough 43. The vibration of the excitation motor 45 causes the material on it to be evenly distributed along the length of the trough 43. The trough 43 is inclined downward along the material conveying direction of the small flow package, with an inclination angle of 1° to 5°. The tracking material spreader 5 includes: a guide rail 51, a material spreading conveyor belt 52, a residual material recovery belt 53, a hanging frame 54, a material spreading machine frame 55, a material spreading belt motor 56, a pre-filling detector 57, and a tobacco shred arrival detector 58. The guide rail 51 is fixed above the mixing belt 6 and at the rear end of the trough 43. The material spreading conveyor belt 52 and the residual material recovery belt 53... Fixed to the spreading machine frame 55, the spreading conveyor belt 52 is inclined downwards along the conveying direction of the small flow package material, with an inclination angle of 1° to 5°. One end of the hanging frame 54 is fixed to the spreading machine frame 55, and the other end is fixed to the guide rail 51 through a connector. The pre-filling detector 57 is mounted on the spreading machine frame 55 above the rear end of the spreading conveyor belt 52, and the tobacco shred arrival detector 58 is mounted on the spreading machine frame 55 below the rear end of the spreading conveyor belt 52. The spreading belt motor 56 drives the spreading conveyor belt 52 to run. The spreading belt motor 56 is a variable... The frequency motor and the material spreading conveyor belt 52 are located directly below the trough 43, and the residual material recycling belt 53 is located below the trough 43. The controller 7 is connected to the computer combination scale 3, the horizontal excitation motor 44, the vertical excitation motor 45, the material spreading belt motor 56, the residual material recycling belt 53, the pre-filling detector 57, and the tobacco shred arrival detector 58. The width of the trough 43, the width of the material spreading conveyor belt 52, and the width of the mixing belt 6 are the same. The computer combination scale 3 is a ZH-A series multi-head combination scale manufactured by Hangzhou Zhongheng Packaging Machinery Co., Ltd.

[0040] The method of the present invention for improving the uniformity of blending small-component tobacco shreds includes the following steps:

[0041] (I) Tobacco feeding

[0042] Small-component or small-group tobacco shreds are sequentially fed to the inlet of computer-controlled combined scale 3 by the first feeder 1 and the second feeder 2 to ensure continuous, stable and uniform feeding.

[0043] (II) Traffic Splitting

[0044] The computer-controlled combined scale 3 divides the flow rate (kg / h) of the small formula or small group of tobacco shreds. The computer-controlled combined scale 3 adopts a constant frequency feeding mode, dividing the blending flow rate (kg / h) into several equal small flow rate packages according to the running time of the blending belt 6. Then, the small flow rate packages are fed into the tank 43 in sequence according to the equal time intervals. Assuming that the blending process flow rate requirement of the small formula tobacco shreds is 600 kg / h, the computer-controlled combined scale is selected as a 14-head scale (i.e., composed of 14 weighing units). First, the flow rate of blended tobacco shreds in the small-blend formula is broken down from 600 kg / h to 10 kg / min. The weight of tobacco shreds dispensed by the computer-controlled combined scale 3 each time is set to 500 g, and the dispensing frequency is 20 times / min. Then the total dispensing amount per minute is 10 kg, and the material output per hour meets the requirement of 600 kg / h. Different time division methods can be adopted according to different blending flow rates of small-blend tobacco shreds. The computer-controlled combined scale 3 uses a permutation and combination algorithm to ensure the target dispensing weight value, thereby improving the consistency and uniformity of the dispensing weight.

[0045] (III) Vibration spreading

[0046] The transverse excitation motor 44 vibrates at a high frequency and low amplitude to spread the small flow package material evenly along the width of the trough 43 each time it falls in. The longitudinal excitation motor 45 vibrates at a high frequency and low amplitude to spread the small flow package material evenly along the length of the trough 43 each time it falls in. The small flow package material is evenly transported to the spreading conveyor belt 52.

[0047] (IV) Tracking the laying of materials

[0048] Small-flow-rate material is conveyed along the spreading conveyor belt 52. When the pre-filling detector 57 detects small-flow-rate material on the spreading conveyor belt 52, and the tobacco shred arrival detector 58 does not detect tobacco shreds on the mixing belt 6, the controller 7 controls the computer combination scale 3, the transverse excitation motor 44, the longitudinal excitation motor 45, and the spreading conveyor belt 52 to stop running. When the pre-filling detector 57 detects small-flow-rate material on the spreading conveyor belt 52, and the tobacco shred arrival detector 58 detects tobacco shreds on the mixing belt 6, the controller 7 starts the computer combination scale 3, the transverse excitation motor 44, the longitudinal excitation motor 45, and the spreading conveyor belt 52. The running speed of the spreading conveyor belt 52 is consistent with the belt speed of the mixing belt 6.

[0049] (V) Waste Material Recycling

[0050] After each batch of production is completed, the controller 7 stops the material spreading belt motor 56, the lateral excitation motor 44, and the longitudinal excitation motor 45, loosens the connector on the hanging frame 54, and moves the hanging frame 54 away along the guide rail 51, so that the material spreading conveyor belt 52 leaves the trough 43, and the residual material recycling belt 53 is located below the trough 43. Then, the hanging frame 54 is fixed on the guide rail 51, and the residual material recycling belt 53, the lateral excitation motor 44, and the longitudinal excitation motor 45 are turned on, so that the residual material in the computer combination scale 3 is sent to the residual material recycling belt 53 through the trough 43 to reduce the loss of small flow package materials.

[0051] In this embodiment, it is assumed that the flow rate requirement for blending small-component tobacco is 600 kg / h, and a 14-head scale (i.e., composed of 14 weighing units) is selected for the computer-controlled combined scale. First, the flow rate of the blending material of small-component tobacco is divided from 600 kg / h to 10 kg / min. The weight of tobacco dispensed by the computer-controlled combined scale (3) is set to 500 g each time, and the dispensing frequency is 20 times / min. Then, the total dispensing amount per minute is 10 kg, and the material output per hour meets the requirement of 600 kg / h. Different time division methods can be adopted according to different blending flow rates of small-component tobacco. The computer-controlled combined scale (3) uses a permutation and combination algorithm to ensure the target dispensing weight value, thereby improving the consistency and uniformity of the dispensing weight.

[0052] The uniformity of blending using this method is 10%–15% higher than that of traditional processes, effectively improving the processing precision and process control capabilities of cigarettes, and contributing to the stability of the internal quality and style of the finished cigarettes. Subsequent processes such as flavoring, storage mixing, and air-powered feeding further enhance the uniformity of the distribution of the small-blend tobacco in the finished cigarettes.

[0053] In summary, the method and system for improving the uniformity of blending small-component tobacco disclosed in this invention effectively avoids the defects of traditional blending processes in current tobacco processing lines, such as poor uniformity of small-component tobacco flow rate along the time axis, poor uniformity of material weight, and poor uniformity of blending distribution, which exist in equipment layout and the use of electronic belt scales. This effectively improves the processing precision and process control capabilities of cigarettes, contributing to the stability of the intrinsic quality and style of the finished cigarettes.

[0054] Finally, it should be noted that the specific embodiments of the present invention have been described in detail on the device with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art.

Claims

1. A method for improving the uniformity of blending small-component tobacco shreds, the method being carried out in a tobacco blending device, the tobacco blending device comprising: The system comprises a first feeder (1), a second feeder (2), a computer-controlled combined scale (3), an excitation spreader (4), a tracking spreader (5), a mixing ribbon (6), and a controller (7). The first feeder (1) is located above the second feeder (2). The inlet of the computer-controlled combined scale (3) is located at the outlet of the second feeder (2), and its outlet is located above the excitation spreader (4). The front end of the tracking spreader (5) is located below the rear end of the excitation spreader (4), and the tracking spreader (5) is located above the mixing ribbon (6). The excitation spreader (4) includes: a frame (41), a shock absorber (42), a trough (43), and a transverse excitation motor. The machine (44) and longitudinal excitation motor (45) are fixed on the frame (41), the shock absorption device (42) is mounted on the frame (41), the transverse excitation motor (44) and the longitudinal excitation motor (45) are respectively mounted on the trough (43). The vibration of the transverse excitation motor (44) makes the material on it evenly distributed along the width direction of the trough (43), and the vibration of the longitudinal excitation motor (45) makes the material on it evenly distributed along the length direction of the trough (43). The tracking material spreading machine (5) includes: guide rail (51), material spreading conveyor belt (52), residual material recycling belt (53), hanging frame (54), and material spreading machine frame (55). The system includes a spreading belt motor (56), a pre-filling detector (57), and a tobacco shred arrival detector (58). A guide rail (51) is fixed above the mixing belt (6) and at the rear end of the trough (43). The spreading conveyor belt (52) and the residual material recycling belt (53) are fixed on the spreading machine frame (55). One end of the hanging frame (54) is fixed on the spreading machine frame (55), and the other end is fixed to the guide rail (51) via a connector. The pre-filling detector (57) is mounted on the spreading machine frame (55) above the rear end of the spreading conveyor belt (52), and the tobacco shred arrival detector (58) is mounted on the spreading machine frame (55) below the rear end of the spreading conveyor belt (52). A motor (56) drives the material spreading conveyor belt (52) to run. The material spreading conveyor belt (52) is located directly below the trough (43), and the residual material recycling belt (53) is located below the trough (43). The controller (7) is connected to the computer combination scale (3), the transverse excitation motor (44), the longitudinal excitation motor (45), the material spreading belt motor (56), the residual material recycling belt (53), the pre-filling detector (57), and the tobacco shred arrival detector (58). The width of the trough (43), the width of the material spreading conveyor belt (52), and the width of the mixing belt (6) are the same. The method for improving the uniformity of blending small-formula tobacco shreds includes the following steps: (I) Tobacco feeding Small-formula or small-component tobacco shreds are sequentially fed to the inlet of the computer-controlled combined scale (3) by the first feeder (1) and the second feeder (2) to ensure continuous, stable and uniform feeding; (II) Traffic Splitting The computer-controlled combined scale (3) divides the flow rate according to the process flow rate of the small formula or the small group of tobacco shreds. The computer-controlled combined scale (3) adopts a constant frequency feeding mode and divides the blending flow rate into several equal small flow rate packages according to the running time of the blending belt (6). Then, the small flow rate packages are fed into the tank (43) in sequence according to the equal time interval. The units of the process flow rate of tobacco shreds and the blending flow rate are kg / h. (III) Vibration spreading The transverse excitation motor (44) vibrates at a high frequency and low amplitude to spread the small flow package material evenly along the width of the trough (43) each time it falls in. The longitudinal excitation motor (45) vibrates at a high frequency and low amplitude to spread the small flow package material evenly along the length of the trough (43) each time it falls in. The small flow package material is evenly transported to the spreading conveyor belt (52). (IV) Tracking the laying of materials Small-flow-rate material is conveyed along the spreading conveyor belt (52). When the pre-filling detector (57) detects the small-flow-rate material on the spreading conveyor belt (52) and the tobacco shred arrival detector (58) does not detect the tobacco shreds on the mixing belt (6), the controller (7) controls the computer combination scale (3), the transverse excitation motor (44), the longitudinal excitation motor (45) and the spreading conveyor belt (52) to stop running. When the pre-filling detector (57) detects the small-flow-rate material on the spreading conveyor belt (52) and the tobacco shred arrival detector (58) detects the tobacco shreds on the mixing belt (6), the controller (7) starts the computer combination scale (3), the transverse excitation motor (44), the longitudinal excitation motor (45) and the spreading conveyor belt (52). The running speed of the spreading conveyor belt (52) is consistent with the belt speed of the mixing belt (6). (V) Waste Material Recycling After each batch of production is completed, the controller (7) stops the material spreading belt motor (56), the lateral excitation motor (44) and the longitudinal excitation motor (45), loosens the connector on the hanging frame (54), and moves the hanging frame (54) away along the guide rail (51), so that the material spreading conveyor belt (52) leaves the trough (43), and the residual material recycling belt (53) is located below the trough (43). Then, the hanging frame (54) is fixed on the guide rail (51), and the residual material recycling belt (53), the lateral excitation motor (44) and the longitudinal excitation motor (45) are turned on, so that the residual material in the computer combination scale (3) is sent to the residual material recycling belt (53) through the trough (43) to reduce the loss of small flow package materials.

2. The method for improving the uniformity of blending small-component tobacco as described in claim 1, characterized in that: The first feeder (1) is a feeder, and the second feeder (2) is a conveyor belt.

3. The method for improving the uniformity of blending small-component tobacco as described in claim 2, characterized in that: The computer-controlled combined scale (3) divides the flow rate into 10g / s to 500g / s; the weighing accuracy of the computer-controlled combined scale (3) is within ±0.5g to ±1g.

4. The method for improving the uniformity of blending small-component tobacco as described in claim 3, characterized in that: The trough (43) is inclined downward along the material conveying direction of the small flow package, with an inclination angle of 1° to 5°.

5. The method for improving the uniformity of blending small-component tobacco as described in claim 4, characterized in that: The material conveyor belt (52) is inclined downward along the material conveying direction of the small flow package, with an inclination angle of 1° to 5°.

6. The method for improving the uniformity of blending small-component tobacco as described in claim 5, characterized in that: The material laying belt motor (56) is a variable frequency motor.

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