Anti-stacking flue-cured tobacco leaf curing device

Abstract

The invention relates to the technical field of tobacco processing, and particularly discloses an anti-stacking flue-cured tobacco leaf curing device which is used for solving the problem of inconvenience in use in the prior art. Comprising a drying box, a hanging component used for hanging tobacco leaves is arranged in the drying box, a stirring component used for stirring the hung tobacco leaves is arranged at the bottom in the drying box, and a circulating airflow component used for providing drying airflow is further arranged on the outer side of the drying box. A visual detection module for obtaining tobacco leaf surface information is arranged in the drying box close to the movable door. The tobacco leaf drying device is designed according to existing requirements, suspended tobacco leaves can be circularly moved in the vertical direction so that the tobacco leaves can be evenly dried, meanwhile, the moving tobacco leaves can be stirred so that the stacking effect between the tobacco leaves can be reduced, the drying quality is guaranteed, the surface color change information of the tobacco leaves can be obtained, and the drying efficiency is improved. Therefore, the drying process of the tobacco leaves is controlled, the problem of excessive drying is avoided, and the processing quality of the tobacco leaves is further guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of tobacco processing, in particular to a baking device for preventing stacking of flue-cured tobacco leaves. Background Art

[0002] In the modern tobacco processing industry, freshly picked tobacco leaves undergo a crucial curing process using specialized curing equipment. This process directly impacts tobacco quality. Dry-bulb and wet-bulb temperature control and curing time are two key parameters in the tobacco curing process. Dry-bulb and wet-bulb temperature control is further subdivided into three key stages: the yellowing phase, the color fixation phase, and the dry-beam phase. Throughout the curing process, precise temperature control is crucial at every stage, and a stable and uniform heat source is essential for ensuring tobacco quality.

[0003] Existing tobacco leaf curing devices primarily use direct hot air injection or air circulation heating to dry tobacco leaves. However, when faced with large-scale tobacco processing, these devices exhibit significant drawbacks: large quantities of tobacco leaves easily accumulate and overlap during the curing process, making it difficult for hot air to penetrate evenly, resulting in partial over- or under-curing of the leaves, seriously affecting the quality of the finished tobacco. While some existing patents have improved upon traditional curing methods, such as the high-efficiency flue-curing device disclosed in patent CN115517390B, which utilizes two baffles to encourage the circulation of tobacco leaves from a high altitude, reducing overlapping and accumulation. Theoretically, this can increase the contact area between the hot air and the tobacco leaf surface and enhance curing uniformity. However, this intermittent curing method presents new challenges in practice. Its complex loading process significantly reduces processing efficiency, making it difficult to meet the requirements of industrial production. Furthermore, the traditional upper and lower drying layer design, due to the uneven vertical distribution of hot air, results in different heating levels for tobacco leaves at different heights, further exacerbating the inconsistency of the curing results. These problems have long restricted the development of tobacco baking technology, and a more efficient and uniform tobacco baking solution is urgently needed.

[0004] Based on this, a flue-cured tobacco leaf baking device that prevents stacking is now provided, which can eliminate the disadvantages of the existing devices. Summary of the Invention

[0005] The object of the present invention is to provide a flue-cured tobacco leaf baking device which is anti-stacking, thereby solving the problem of inconvenience in use in the prior art.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A device for baking anti-stacking flue-cured tobacco leaves comprises a drying box, wherein a hanging component for hanging tobacco leaves is provided inside the drying box, and a toggling component for toggling the suspended tobacco leaves is provided at the bottom of the drying box. The toggling effect makes it difficult for the tobacco leaves to stack, which helps to improve the drying effect. A circulating airflow component for providing drying airflow is also provided on the outside of the drying box, and a visual detection module for obtaining surface information of the tobacco leaves is provided inside the drying box near a movable door. The visual detection module and the hanging component are electrically connected to a control terminal.

[0008] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:

[0009] In an optional solution: the lower end of the drying box is provided with multiple legs, the drying box is a rectangular box structure, and a movable door is provided at the opening position at one end. A sealing ring is provided between the movable door and the drying box, and an observation window is provided on the surface of the movable door for observing its internal conditions.

[0010] In an optional solution: the circulating airflow component includes an air intake buffer box arranged at the bottom of the drying box, the exhaust end of the air intake buffer box is connected to the drying box, and the top of the drying box is connected to an exhaust buffer box. The exhaust buffer box and the air intake buffer box are connected through a circulation duct. The circulation duct is provided with a circulating fan for promoting airflow and a heating filter box for filtering and heating the airflow. The heating filter box is provided with a heating pipe and a dehumidification block, and a thermometer is provided inside the drying box.

[0011] In an optional solution: a heat insulation layer is provided on the outside of the drying box.

[0012] In an optional solution: the suspension component includes two transmission chains symmetrically arranged inside the drying box, each transmission chain is equipped with two driving sprockets and two driven sprockets, the driven sprocket is rotatably connected to the inner wall of the drying box through a second fixed rotating shaft, the driving sprocket is rotatably connected to the inner wall of the drying box through a first fixed rotating shaft, and multiple groups of driven sprockets rotate between the two transmission chains, and multiple hooks are rotatably provided at the lower end of the driven sprocket, and tobacco leaves are hung by the hooks, and the driving sprocket is connected to a circulating drive mechanism for driving its rotation.

[0013] In an optional scheme: the circulating drive mechanism includes a vertical transmission rod rotatably arranged inside the drying box, a transmission worm is provided on the vertical transmission rod, a transmission worm wheel is provided on the first fixed rotating shaft outside the driving sprocket, the transmission worm wheel and the transmission worm are engaged with each other, a synchronous wheel is provided at the upper end of the vertical transmission rod, there are two vertical transmission rods, and the two synchronous wheels are connected by a synchronous belt transmission, and the upper end of one of the vertical transmission rods is connected to a driving motor for driving it to rotate.

[0014] In an optional scheme: the toggle component includes a bracket fixed to the bottom of the drying box, a flip shaft cylinder is rotatably provided between the two brackets, a plurality of toggle plates are distributed on the outside of the flip shaft cylinder, a plurality of toggle side tubes are distributed on the outside of the toggle plates, the toggle side tubes, the toggle plates and the inner cavity of the flip shaft cylinder are connected, an exhaust port is provided at the outer end of the toggle side tube, the air inlet end of the flip shaft cylinder is connected to the air inlet duct, and the other end of the air inlet duct is provided with a blowing part for blowing air into it, the flip shaft cylinder is connected to a transmission part for driving it to rotate, and the transmission part includes a second bevel gear arranged at the axial end of the flip shaft cylinder, one side of the second bevel gear is meshed with the first bevel gear, and the first bevel gear is coaxially arranged on the transmission worm.

[0015] In an optional solution, the blowing member includes a rotating disc body connected to an air inlet duct, a plurality of air inlets are distributed on the outer side of the rotating disc body, and an air inlet blade is provided at each air inlet position.

[0016] In an optional solution: the visual inspection module includes a camera bracket placed horizontally on the inner wall of the drying box, and a plurality of camera groups facing the tobacco leaves are distributed on the camera bracket.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The present invention is designed according to existing needs. It can move the suspended tobacco leaves in a vertical direction in a circular motion so that the tobacco leaves are evenly dried. At the same time, the moving tobacco leaves can be moved to reduce the stacking effect between the tobacco leaves, thereby ensuring the drying quality. The surface color change information of the tobacco leaves can also be obtained, thereby controlling the drying process of the tobacco leaves, avoiding the problem of over-drying, and further ensuring the processing quality of the tobacco leaves. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of one side of the present invention.

[0020] Figure 2 It is a structural schematic diagram of another side of the present invention.

[0021] Figure 3 It is a schematic diagram of the lower structure of the present invention.

[0022] Figure 4 It is a schematic structural diagram of the suspension component of the present invention.

[0023] Figure 5 It is a structural schematic diagram of the toggle component of the present invention.

[0024] Figure 6 It is a structural schematic diagram of the visual detection module of the present invention.

[0025] Notes on reference numerals:

[0026] Drying box 100, movable door 101, observation window 102, supporting legs 103, control terminal 104;

[0027] Visual inspection module 200, camera bracket 201, camera group 202;

[0028] Suspension component 300, drive motor 301, synchronous wheel 302, synchronous belt 303, transmission worm 304, transmission worm wheel 305, first fixed shaft 306, driving sprocket 307, first bevel gear 308, second fixed shaft 309, transmission chain 310, driven sprocket 311, hook 312, hanging rod 313;

[0029] A toggle component 400, a tilting shaft cylinder 401, a toggle plate 402, a toggle side pipe 403, a bracket 404, a rotating disc 405, an air inlet 406, an air inlet blade 407, an air inlet duct 408, and a second bevel gear 409;

[0030] Exhaust buffer box 500 , circulation fan 501 , circulation duct 502 , heating filter box 503 , and intake buffer box 504 . DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without creative work are within the scope of protection of the present invention.

[0032] like Figures 1-6 As shown, the embodiment of the present invention provides a baking device for preventing stacking of flue-cured tobacco leaves, including a drying box 100, a plurality of supporting legs 103 are provided at the lower end of the drying box 100, the drying box 100 is a rectangular box structure, and a movable door 101 is provided at the opening position of one end thereof, a sealing ring is provided between the movable door 101 and the drying box 100, and an observation window 102 is provided on the surface of the movable door 101 for observing the internal situation thereof, a hanging component 300 for hanging tobacco leaves is provided inside the drying box 100, and a toggling component 400 for toggling the suspended tobacco leaves is provided at the bottom of the drying box 100. The toggling effect makes the tobacco leaves less likely to stack, which helps to improve the drying effect, and a circulating airflow component for providing drying airflow is further provided on the outside of the drying box 100, and a visual detection module 200 for obtaining surface information of the tobacco leaves is provided inside the drying box 100 near the movable door 101, so that the staff can accurately control the drying situation and avoid the problem of over-drying. The visual detection module 200 and the hanging component 300 are electrically connected to the control terminal 104:

[0033] The circulating airflow component includes an air intake buffer box 504 arranged at the bottom of the drying box 100, the exhaust end of the air intake buffer box 504 is connected to the drying box 100, and the top of the drying box 100 is connected to an exhaust buffer box 500, and the exhaust buffer box 500 and the air intake buffer box 504 are connected through a circulation duct 502. The circulation duct 502 is provided with a circulating fan 501 for promoting air flow and a heating filter box 503 for filtering and heating the air flow. The heating filter box 503 is provided with a heating pipe and a dehumidification block. The dehumidification block removes moisture from the air and cooperates with the heating pipe to provide an optimal drying temperature. A thermometer is provided inside the drying box 100, and a closed-loop mechanism is constructed with feedback from the thermometer to accurately control the drying temperature and ensure baking quality.

[0034] The outside of the drying box 100 is provided with a heat insulation layer to reduce heat loss;

[0035] The hanging component 300 includes two transmission chains 310 symmetrically arranged inside the drying box 100, each transmission chain 310 is equipped with two driving sprockets 307 and two driven sprockets 311, the driven sprockets 311 are rotatably connected to the inner wall of the drying box 100 through the second fixed rotating shaft 309, the driving sprocket 307 is rotatably connected to the inner wall of the drying box 100 through the first fixed rotating shaft 306, and multiple groups of driven sprockets 311 rotate between the two transmission chains 310. The lower end of the driven sprocket 311 is rotatably provided with multiple hooks 312, and tobacco leaves are hung by the hooks 312. The driving sprocket 307 is connected to a circulating drive mechanism for driving its rotation, and the circulating drive mechanism drives the driving sprocket 307 to rotate, and the driving sprocket 307 drives the transmission chain 310 to rotate, and the transmission chain 310 drives multiple hanging rods 313 to rotate inside the drying box 100, so that the tobacco leaves are continuously circulated and moved, avoiding the problem of inconsistent positions of the upper and lower layers;

[0036] The circulating drive mechanism includes a vertical transmission rod rotatably arranged inside the drying box 100, a transmission worm 304 is provided on the vertical transmission rod, a transmission worm wheel 305 is provided on the first fixed rotating shaft 306 outside the driving sprocket 307, the transmission worm wheel 305 and the transmission worm wheel 304 are meshed with each other, a synchronous wheel 302 is provided at the upper end of the vertical transmission rod, two vertical transmission rods are provided, and the two synchronous wheels 302 are connected by a synchronous belt 303, the upper end of one of the vertical transmission rods is connected to a driving motor 301 for driving the rotation thereof, under the drive of the driving motor 301, the vertical transmission rod drives the synchronous wheel 302 to rotate, and with the transmission of the synchronous belt 303, the two vertical transmission rods will rotate synchronously, the transmission worm 304 on the vertical transmission rod matches the transmission worm wheel 305, thereby driving multiple driving sprockets 307 to rotate synchronously, and the driving sprocket 307 causes the two transmission chains 310 to rotate synchronously;

[0037] The toggle component 400 includes a bracket 404 fixed to the bottom of the drying box 100, a flip shaft cylinder 401 is rotatably provided between the two brackets 404, a plurality of toggle plates 402 are distributed on the outside of the toggle shaft cylinder 401, a plurality of toggle side tubes 403 are distributed on the outside of the toggle plates 402, the toggle side tubes 403, the toggle plates 402 and the inner cavity of the toggle shaft cylinder 401 are connected, an exhaust port is provided at the outer end of the toggle side tube 403, the air inlet end of the toggle shaft cylinder 401 is connected to the air inlet duct 408, and the other end of the air inlet duct 408 is provided with a port for blowing air into the interior thereof The blowing member is connected to a transmission member for driving the rotation of the flip shaft cylinder 401. The transmission member includes a second bevel gear 409 provided at the shaft end of the flip shaft cylinder 401. One side of the second bevel gear 409 is meshed with the first bevel gear 308. The first bevel gear 308 is coaxially provided on the transmission worm 304. When the flip shaft cylinder 401 rotates, the blowing member starts to work, so that gas enters the flip shaft cylinder 401, and then the air flow is discharged along the port of the toggle side tube 403. When discharged, the air flow can help disperse the tobacco leaves from the side, further reducing the stacking phenomenon.

[0038] The blowing element includes a rotating disc 405 connected to an air inlet duct 408. A plurality of air inlets 406 are distributed on the outside of the rotating disc 405. Each air inlet 406 is provided with an air inlet blade 407. Under the action of the air inlet blade 407, the air flow will be guided into the rotating disc 405 to complete the rotational air intake.

[0039] The visual inspection module 200 includes a camera support 201 placed horizontally on the drying box 100. The camera support 201 is provided with a plurality of camera groups 202 facing the tobacco leaves, so that multiple sets of image information of the tobacco leaves can be obtained;

[0040] Multiple camera groups 202 shoot tobacco leaves from different angles to obtain multiple sets of image information of tobacco leaves. After obtaining the images, the system uses image recognition and analysis technology to process the surface feature information of the tobacco leaves:

[0041] 1. Image segmentation and feature extraction:

[0042] Image segmentation: Using the threshold segmentation method based on the Otsu algorithm, the optimal segmentation threshold is automatically calculated by maximizing the inter-class variance . Assume the grayscale of the image is , the total number of pixels is , the gray value is The number of pixels is , then the gray value is The probability of a pixel appearing Between-class variance The calculation formula is as follows:

[0043] in, , , , , By traversing all possible thresholds , find the The largest Value, so as to achieve the separation of tobacco leaf image and background. Color feature extraction: Convert the image from RGB color space to HSV color space, and extract the hue (H), saturation (S), and brightness (V) mean of the tobacco leaf image. Assume that there are a total of pixels, the The hue value of a pixel in the HSV space is , saturation value is , the lightness value is , then the mean hue of tobacco leaves , saturation mean , average brightness The calculation formulas are:

[0044] Texture feature extraction: Use gray level co-occurrence matrix (GLCM) to extract texture features. For a given grayscale image, in a specific direction (such as 0°, 45°, 90°, 135°) and distance Next, construct the gray-level co-occurrence matrix ,in and The following features are calculated based on GLCM: Energy: , reflects the uniformity of the grayscale distribution of the image. Entropy: , which indicates the complexity of the image texture. Contrast: , describes the intensity of grayscale changes in the image. Correlation: , measures the correlation of image grayscale distribution, where 、 They are 、 The mean of 、 They are 、 The standard deviation of .

[0045] Morphological feature extraction: The contour detection algorithm is used to obtain the contour of the tobacco leaf, and the contour perimeter is calculated. and the area enclosed by the contour , and then get the shape factor , the shape factor can reflect the morphological changes of tobacco leaves, The closer the value is to 1, the closer the shape of the tobacco leaf is to a circle; at the same time, the longest axis length of the tobacco leaf is measured. and the shortest axis length , used to judge the curling and size reduction of tobacco leaves.

[0046] 2. Drying process prediction model:

[0047] Based on a large amount of experimental data, a back propagation neural network (BP neural network) was used to build a tobacco drying process prediction model. The extracted color features ( 、 、 ), texture features ( 、 、 、 ) and morphological characteristics ( 、 、 ) as the input data of the 10 neurons in the input layer. The hidden layer is set to 2 layers, with 15 and 10 neurons respectively, and the ReLU activation function is used. Perform nonlinear transformation. The output layer is 1 neuron, which outputs the corresponding drying degree value. , using a linear activation function. During model training, the mean square error (MSE) is defined as the loss function:

[0048] in, is the number of training samples, is the actual drying degree value. The predicted drying degree value of the model. The model weights and biases are iteratively updated using the stochastic gradient descent (SGD) algorithm to minimize the loss function and optimize model performance.

[0049] 3. Control Logic

[0050] The system sets the target drying level threshold , when the drying degree value output by the prediction model Meet or exceed When the signal is detected, a control instruction is triggered and sent to the equipment control system, which immediately stops the drying equipment to prevent over-drying of the tobacco leaves and ensure their quality and drying efficiency. The above solution achieves quantitative judgment of the tobacco leaf drying process through a specific mathematical model.

[0051] Working principle: In actual use, the circulating airflow component works to provide a drying environment for tobacco leaf baking. The circulating drive mechanism drives the active sprocket 307 to rotate, and the active sprocket 307 drives the transmission chain 310 to rotate. The transmission chain 310 drives multiple hanging rods 313 to rotate inside the drying box 100, so that the tobacco leaves are continuously circulated to avoid the problem of inconsistent positions of the upper and lower layers. Under the drive of the vertical transmission rod, the first bevel gear 308 matches the second bevel gear 409, thereby driving the flip shaft cylinder 401 to rotate. When the flip shaft cylinder 401 rotates, the toggle plate 402 and the toggle side tube 403 outside the flip shaft cylinder 401 rotate, thereby toggle the suspended tobacco leaves and break them up. When the flip shaft cylinder 401 is working, the blowing part starts to work, so that the gas enters the flip shaft cylinder 401, and then the air flow is discharged along the port of the toggle side tube 403. When discharged, it can assist in dispersing the tobacco leaves from the side, further reducing the stacking phenomenon.

[0052] 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 in the scope of protection of the present invention.

Claims

1. A device for baking flue-cured tobacco leaves to prevent stacking, comprising a drying box (100), characterized in that: A hanging component (300) for hanging tobacco leaves is provided inside the drying box (100), a moving component (400) for moving the hung tobacco leaves is provided at the bottom of the drying box (100), a circulating airflow component for providing a drying airflow is further provided on the outside of the drying box (100), and a visual inspection module (200) for obtaining surface information of the tobacco leaves is provided inside the drying box (100) near the movable door (101), and the visual inspection module (200) and the hanging component (300) are electrically connected to a control terminal (104).

2. The anti-stacking flue-cured tobacco leaf baking device according to claim 1, characterized in that: The drying box (100) is provided with a plurality of supporting legs (103) at the lower end. The drying box (100) is a rectangular box structure, and a movable door (101) is provided at an opening position at one end thereof. A sealing ring is provided between the movable door (101) and the drying box (100). An observation window (102) for observing the internal conditions thereof is provided on the surface of the movable door (101).

3. The anti-stacking flue-cured tobacco leaf baking device according to claim 1, characterized in that: The circulating airflow component includes an air intake buffer box (504) arranged at the bottom of the drying box (100), the exhaust end of the air intake buffer box (504) is connected to the drying box (100), and the top of the drying box (100) is connected to an exhaust buffer box (500), and the exhaust buffer box (500) and the air intake buffer box (504) are connected through a circulation duct (502), and the circulation duct (502) is provided with a circulating fan (501) for promoting air flow and a heating filter box (503) for filtering and heating the air flow, and the heating filter box (503) is provided with a heating pipe and a dehumidification block, and a thermometer is provided inside the drying box (100).

4. The anti-stacking flue-cured tobacco leaf baking device according to claim 1, characterized in that: A heat insulation layer is provided on the outside of the drying box (100).

5. The anti-stacking flue-cured tobacco leaf baking device according to claim 1, characterized in that: The suspension component (300) comprises two transmission chains (310) symmetrically arranged inside the drying box (100), each transmission chain (310) being provided with two driving sprockets (307) and two driven sprockets (311), the driven sprockets (311) being rotationally connected to the inner wall of the drying box (100) via a second fixed rotating shaft (309), the driving sprocket (307) being rotationally connected to the inner wall of the drying box (100) via a first fixed rotating shaft (306), multiple groups of driven sprockets (311) being rotationally provided between the two transmission chains (310), the lower ends of the driven sprockets (311) being rotationally provided with multiple hooks (312), tobacco leaves being suspended via the hooks (312), and the driving sprockets (307) being connected to a circulating drive mechanism for driving the rotation thereof.

6. The anti-stacking flue-cured tobacco leaf baking device according to claim 5, characterized in that: The circulation drive mechanism comprises a vertical transmission rod rotatably arranged inside the drying box (100), a transmission worm (304) being provided on the vertical transmission rod, a transmission worm wheel (305) being provided on a first fixed rotating shaft (306) outside the driving sprocket (307), the transmission worm wheel (305) and the transmission worm wheel (304) being meshed with each other, a synchronous wheel (302) being provided at the upper end of the vertical transmission rod, two vertical transmission rods being provided, and the two synchronous wheels (302) being connected to each other via a synchronous belt (303), and the upper end of one of the vertical transmission rods being connected to a driving motor (301) for driving the rotation thereof.

7. The anti-stacking flue-cured tobacco leaf baking device according to claim 6, characterized in that: The toggle component (400) includes a bracket (404) fixed to the bottom of the drying box (100), a turning shaft cylinder (401) is rotatably provided between the two brackets (404), a plurality of toggle plates (402) are distributed on the outside of the turning shaft cylinder (401), a plurality of toggle side tubes (403) are distributed on the outside of the toggle plates (402), the inner cavities of the toggle side tubes (403), the toggle plates (402) and the turning shaft cylinder (401) are connected, and an exhaust port is provided at the outer end of the toggle side tube (403). The air inlet end of the flip shaft cylinder (401) is communicated with the air inlet duct (408), and the other end of the air inlet duct (408) is provided with a blowing member for blowing air into the interior thereof. The flip shaft cylinder (401) is connected to a transmission member for driving the flip shaft cylinder (401) to rotate, and the transmission member includes a second bevel gear (409) provided at the shaft end of the flip shaft cylinder (401), one side of the second bevel gear (409) is meshed with the first bevel gear (308), and the first bevel gear (308) is coaxially provided on the transmission worm (304).

8. The anti-stacking flue-cured tobacco leaf baking device according to claim 7, characterized in that: The blowing member comprises a rotating disc body (405) connected to an air inlet duct (408), a plurality of air inlets (406) are distributed on the outside of the rotating disc body (405), and an air inlet blade (407) is provided at the position of each air inlet (406).

9. The anti-stacking flue-cured tobacco leaf baking device according to claim 1, characterized in that: The visual inspection module (200) comprises a camera support (201) placed horizontally on the inner wall of the drying box (100), and a plurality of camera groups (202) facing the tobacco leaves are distributed on the camera support (201).

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