Air source heat pump tobacco curing barn capable of achieving internal circulation dehumidification and control method

Abstract

The invention provides an air source heat pump tobacco curing barn capable of achieving internal circulation dehumidification and a control method, and relates to the technical field of air source heat pump tobacco curing barns. The control method comprises temperature and humidity adjustment control and ash removal control operation, and according to the ash removal control operation, the moving path of an ash removal assembly is planned based on an A * algorithm; a top guide rail of a tobacco curing barn is divided into a grid map, the current position of a moving part serves as a starting point, a target ash removal position serves as an end point, a comprehensive cost function f (n) is constructed through a heuristic function and a cost function, and a node planning path is expanded according to the f (n) value minimum principle through an A * algorithm. Through the ash removal assembly structure, accumulated ash in the treatment box can be effectively removed; meanwhile, according to ash removal path planning based on an A * algorithm, visual information is combined to identify an area without ash removal and select a target ash removal position, the ash removal efficiency is improved, the ash removal time is shortened, the labor intensity is reduced, pollution of dust to tobacco leaves is avoided, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of air source heat pump flue-curing barns, and particularly to an air source heat pump flue-curing barn with internal circulation dehumidification and a control method therefor. Background Art

[0002] In the tobacco leaf baking industry, the technical drawbacks of traditional flue-curing barns are becoming increasingly prominent. With the continuous expansion of the tobacco leaf planting scale and the continuous increase in the market demand for high-quality tobacco leaves, traditional flue-curing barns are no longer able to meet the requirements of large-scale production.

[0003] The main problems of existing flue-curing barns include: inaccurate temperature and humidity regulation, which cannot meet the strict requirements of tobacco leaves for temperature and humidity at different baking stages, resulting in unstable tobacco quality; backward ash cleaning methods, after the tobacco baking is completed, stains accumulate on the inner wall of the top of the barn, and there is a lack of automatic ash cleaning equipment, which not only shortens the service life of the equipment, but also easily pollutes the tobacco leaves, reducing the appearance quality and taste of the tobacco leaves; poor design of the air circulation system, there are problems of poor air flow and local stagnation, affecting the baking effect and resulting in low energy utilization efficiency. Therefore, it is necessary to provide an air source heat pump flue-curing barn with internal circulation dehumidification and a control method therefor to solve the above technical problems. Summary of the Invention

[0004] The present invention aims to provide an air source heat pump flue-curing barn with internal circulation dehumidification and a control method therefor, to solve the problems of inaccurate temperature and humidity regulation, low ash cleaning efficiency, easy pollution of tobacco leaves by dust and poor air circulation in traditional flue-curing barns, and to achieve accurate temperature and humidity control, efficient ash cleaning and good air circulation, thereby improving the quality and production efficiency of tobacco baking, reducing labor intensity and environmental pollution.

[0005] To solve the above technical problems, an air source heat pump flue-curing barn with internal circulation dehumidification provided by the present invention includes a flue-curing barn, a circulation component is installed on the flue-curing barn, a hinge seat is welded on the outer wall at one end of the flue-curing barn, a sealed door is hinged on the hinge seat, an operating platform is embedded on one side of the sealed door, two guide rails are symmetrically arranged on the inner wall of the top of the flue-curing barn, a plurality of positioning pins for fixing are equidistantly arranged in the guide rails, a moving member is slidably arranged on the two guide rails, a cross plate is fixedly connected to the moving member by bolts, and a dust cleaning component is installed on the cross plate;

[0006] An air source heat pump is arranged in the flue-curing barn, and a temperature and humidity sensor is installed inside the flue-curing barn for real-time monitoring of the temperature and humidity data in the barn.

[0007] Preferably, the dust cleaning assembly includes a motor, the output shaft of the motor penetrates to the top of the cross plate, a shaft sleeve is provided at the connection between the output shaft of the motor and the cross plate, a connecting plate is fixedly connected to the output end of the motor, the other end of the connecting plate is fixedly connected to a driven disk, three support shafts are equidistantly arranged on the driven disk, connecting blocks are rotatably connected to the support shafts, a dust-carrying disk is connected to the driven disk at the top of the connecting plate through the connecting blocks, a rotating shaft is arranged on the top end surface of the connecting plate, the rotating shaft is rotatably connected to the dust-carrying disk, and a brush barrel is fixedly connected to one end of the rotating shaft.

[0008] Preferably, the circulation component includes a blower installed on one side of the flue-curing barn, and a ventilator is installed on the other side of the flue-curing barn.

[0009] The present application also provides a control method for an air source heat pump flue-curing barn with internal circulation dehumidification as described above. The control method includes temperature and humidity adjustment control and dust cleaning control operations;

[0010] The temperature and humidity adjustment control specifically adopts a fuzzy control algorithm, and the specific steps are as follows:

[0011] Obtain the actual temperature and actual humidity in the flue-curing barn, and record the difference between the actual temperature and the set temperature as the temperature difference , and record the difference between the actual humidity and the set humidity as the humidity difference ;

[0012] Define the input variables as the temperature difference and humidity difference in the flue-curing barn, and the output variables as the air volume adjustment ΔV of the blower and the heating power adjustment ΔP of the air source heat pump;

[0013] The dust cleaning control operation uses the A* algorithm to plan the movement path of the dust cleaning assembly. Divide the guide rail on the top of the flue-curing barn into a grid map, with the current position of the moving part as the starting point and the target dust cleaning position as the end point, and define the heuristic function , where and are the horizontal and vertical coordinates of the current node n respectively, and are the horizontal and vertical coordinates of the target dust cleaning position; the cost function g(n) is the actual movement cost from the starting point to the current node n, and the comprehensive cost function f(n)=g(n)+h(n). The A* algorithm selects the node with the smallest f(n) value for expansion to plan the path.

[0014] Preferably, the fuzzy control algorithm for the temperature and humidity adjustment control specifically includes:

[0015] S11, fuzzification: , They are respectively divided into 7 fuzzy subsets: large negative, medium negative, small negative, zero, small positive, medium positive, and large positive. Determine their membership degrees on the fuzzy subsets according to the actual measured values. The membership degree function adopts a triangular function or a trapezoidal function, and the wind speed adjustment amount ΔV and the heating power adjustment amount ΔP are divided into corresponding fuzzy subsets;

[0016] S12. Set fuzzy rules: formulate a fuzzy rule table based on the flue-cured tobacco process and experience, covering various combinations of temperature and humidity deviation situations;

[0017] S13. Defuzzify: use the centroid method to convert the fuzzy output into an accurate value. The calculation formula is: , , where is the membership degree of the output variable under a certain fuzzy subset, 、 are the values of the wind speed adjustment amount and the heating power adjustment amount under the corresponding fuzzy subsets, and n is the number of fuzzy subsets participating in the calculation; control the operation of the intake fan and the air source heat pump through the calculated ΔV and ΔP to achieve precise temperature and humidity regulation.

[0018] Preferably, after the tobacco material baking is completed and taken out, trigger the ash cleaning process, specifically:

[0019] For the initial ash cleaning operation, control the moving part to reciprocate on the guide rail at a set moving speed for a set distance, and control the ash cleaning component to perform the ash cleaning operation;

[0020] After the initial ash cleaning is completed, obtain the visual information of the top of the flue-cured tobacco barn, determine the area where the ash cleaning is not complete according to the visual information of the top of the flue-cured tobacco barn, and select the target ash cleaning position according to the position of the area where the ash cleaning is not complete and the guide rail; if there is a target ash cleaning position, perform an ash cleaning control operation once, plan the moving path of the moving part based on the A* algorithm, and start the ash cleaning component when the moving part moves within a set distance from the target ash cleaning position until all target ash cleaning positions are completed; if there is no target ash cleaning position, it means that the ash cleaning is completed.

[0021] Preferably, after the initial ash cleaning is completed, the specific acquisition logic for selecting the target ash cleaning position is:

[0022] Obtain the visual image of the top of the flue-cured tobacco barn and perform preprocessing to enhance the contrast of the image. Adopt the threshold segmentation algorithm to convert the image from the RGB color space to the gray space to obtain the gray image I(x, y), where x and y respectively represent the horizontal and vertical coordinates of the pixel points in the image; set a gray threshold T, and perform binaryzation processing on the image through the following formula:

[0023] , in the binary image B(x, y), the pixel points with a value of 1 represent the areas where dust may exist;

[0024] Perform morphological operations on the binary image, including erosion and dilation, to remove isolated noise points and fill the holes in the dust area, obtaining a more accurate dust area image D(x, y);

[0025] Statistically analyze the connected regions with pixel value 1 in D(x, y), and determine the connected regions with an area greater than the set area threshold as the regions that are not completely cleaned; Denote each region that is not completely cleaned as , j = 1, 2,..., g, where g is the number of regions that are not completely cleaned, and j represents the number of the region that is not completely cleaned;

[0026] For each region that is not completely cleaned, traverse all the pixel points (x c , y c ) within the region;

[0027] Represent the position information of the guide rail in the image in the form of a line segment, identify the positions that coincide with the line segment corresponding to the guide rail in the region that is not completely cleaned and denote the set of all such coincident positions as ;

[0028] After obtaining the set of the positions where the region that is not completely cleaned coincides with the guide rail, obtain the current position of the moving part (6) and denote it as , calculate the Euclidean distance d from each point in to the current position of the moving part (6). The formula is: , traverse all the points in , find the point with the minimum distance d, and use it as the end point of this ash cleaning and denote it as the target ash cleaning position .

[0029] Preferably, after completing an ash cleaning task, evaluate the ash cleaning effect. The evaluation indicators include the difference in dust concentration before and after ash cleaning, the dust collection amount of the ash carrier tray, and the number of target ash cleaning positions;

[0030] Perform weighted calculation on the difference in dust concentration before and after ash cleaning, the dust collection amount of the ash carrier tray, and the number of target ash cleaning positions to obtain the ash cleaning effect value; If the ash cleaning effect value is less than its ash cleaning effect threshold, perform a secondary ash cleaning control operation.

[0031] Compared with the related technology, an air source heat pump tobacco curing barn with internal circulation dehumidification and its control method provided by the present invention have the following beneficial effects:

[0032] Through real-time monitoring by the temperature and humidity sensors and combined with the fuzzy control algorithm, the present invention can accurately adjust the air inlet fan speed and the heating power of the air source heat pump according to the requirements of different baking stages of tobacco leaves, realizing precise control of the temperature and humidity in the treatment box and improving the stability of the flue-cured tobacco quality.

[0033] With a reasonable structural design of the ash cleaning component, the motor, connecting plate, driven disc, connecting block, ash loading tray and brush barrel work together, which can effectively remove the accumulated ash in the treatment box; at the same time, based on the ash cleaning path planning of the A* algorithm, combined with visual information to identify the uncleaned area and select the target ash cleaning position, the ash cleaning efficiency is improved, the ash cleaning time and labor intensity are reduced, the pollution of tobacco leaves by dust is avoided, and the service life of the equipment is prolonged. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a three-dimensional view of an air source heat pump flue-cured tobacco barn with internal circulation dehumidification provided by the present invention;

[0035] Figure 2 is an internal schematic diagram of the flue-cured tobacco barn proposed by the present invention;

[0036] Figure 3 is a structural schematic diagram of the ash cleaning component proposed by the present invention;

[0037] Figure 4 is a structural schematic diagram of the ash cleaning component from another perspective proposed by the present invention;

[0038] Figure 5 is a flowchart of temperature and humidity control in a control method of an air source heat pump flue-cured tobacco barn with internal circulation dehumidification provided by the present invention;

[0039] Figure 6 is a flowchart of ash cleaning control operation in a control method of an air source heat pump flue-cured tobacco barn with internal circulation dehumidification provided by the present invention.

[0040] Reference numerals in the figures: 1, flue-cured tobacco barn; 2, air inlet fan; 3, airtight door; 4, operation console; 5, guide rail; 6, moving part; 7, cross plate; 8, motor; 9, brush barrel; 10, driven disc; 11, connecting block; 12, connecting plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0042] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. The singular forms of "group", "class" and "the" used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly dictates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0043] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this disclosure, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "when" or "while" or "in response to determining".

[0044] Please refer to Figures 1-6 ., An air source heat pump flue-curing barn with internal circulation dehumidification function, including a flue-curing barn 1, a circulation component is installed on the flue-curing barn 1, a hinge seat is welded on the outer wall at one end of the flue-curing barn 1, a sealed door 3 is hinged on the hinge seat, an operation platform 4 is embedded on one side of the sealed door 3, two guide rails 5 are symmetrically arranged on the inner wall of the top of the flue-curing barn 1, a plurality of positioning pins for fixing are equidistantly arranged in the guide rails 5, a moving part 6 is slidably arranged on the two guide rails 5, the moving part 6 is a device with the function of moving on the guide rail 5, the design of the moving part 6 belongs to the existing conventional technology, and its purpose is to realize the movement of the ash cleaning component on the guide rail 5 at the top of the flue-curing barn 1 to complete the ash cleaning operation in the barn; a cross plate 7 is fixedly connected to the moving part 6 by bolts, and an ash cleaning component is installed on the cross plate 7;

[0045] An air source heat pump is arranged in the flue-curing barn 1, and a temperature and humidity sensor is installed inside the flue-curing barn 1 for real-time monitoring of the temperature and humidity data in the barn; it should be clearly stated that the air source heat pump arranged in the flue-curing barn 1 in this application is the existing conventional technology and is not the innovation point of this solution. It mainly undertakes the heating function in the flue-curing barn 1 to meet the temperature requirements during the tobacco leaf baking process. To more clearly and concisely display the innovative content of this application and avoid the accompanying drawings being too complex to interfere with the understanding of the key technical features, the air source heat pump is not drawn in the accompanying drawings (such as Figures 1-6 ) of this application; the drawings mainly focus on showing the innovative structures and components in the present invention, such as the layout of the circulation component, the ash cleaning component, the guide rail 5 and the moving part 6, as well as the connection relationship and the collaborative working mode between the components. These innovation points together constitute the core technical solution of the air source heat pump flue-curing barn with internal circulation dehumidification function and the control method of the present invention.

[0046] It should be noted that the flue-curing barn 1 in the attached drawings of the invention patent of this application is only an example, which is not drawn according to the actual specifications and sizes, and is only for reference in this application to assist in understanding the technical solution and structural composition of the present invention; the attached drawings are intended to clearly show the key structures and working principles of the present invention, and the shapes, sizes, and proportions of each component do not represent the exact specifications of the actual product; when actually applying and implementing the present invention, the parameters of the flue-curing barn 1 should be designed and adjusted according to specific production requirements and engineering standards;

[0047] In this application, the ash cleaning component includes a motor 8. The output shaft of the motor 8 penetrates to the top of the cross plate 7. A shaft sleeve is provided at the connection between the output shaft of the motor 8 and the cross plate 7. The output end of the motor 8 is fixedly connected with a connecting plate 12. The other end of the connecting plate 12 is fixedly connected with a driven disk 10. Three support shafts are equidistantly arranged on the driven disk 10. Connecting blocks 11 are rotatably connected to the support shafts. The driven disk 10 on the top of the connecting plate 12 is connected with an ash-loading tray through the connecting blocks. A rotating shaft is arranged on the top end surface of the connecting plate 12, and the rotating shaft is rotatably connected with the ash-loading tray. One end of the rotating shaft is fixedly connected with a brush barrel 9; a heat insulation sleeve is sleeved at the connection between the rotating shaft and the ash-loading tray.

[0048] In this application, the circulation component includes an air inlet fan 2 installed on one side of the flue-curing barn 1, and a ventilator is installed on the other side of the flue-curing barn 1.

[0049] In this application, a control method for the air source heat pump flue-curing barn capable of internal circulation dehumidification is also provided. The control method includes temperature and humidity adjustment control and ash cleaning control operations;

[0050] The temperature and humidity adjustment control specifically adopts a fuzzy control algorithm. The specific steps are as follows:

[0051] Obtain the actual temperature and actual humidity in the flue-curing barn 1, and record the difference between the actual temperature and the set temperature as the temperature difference , and record the difference between the actual humidity and the set humidity as the humidity difference ;

[0052] Define the input variables as the temperature difference and humidity difference in the flue-curing barn 1, and the output variables as the wind speed adjustment amount of the air inlet fan and the heating power adjustment amount of the air source heat pump;

[0053] The ash cleaning control uses the A* algorithm to plan the movement path of the ash cleaning component. Divide the guide rail 5 on the top of the flue-curing barn 1 into a grid map. Take the current position of the moving part 6 as the starting point and the target ash cleaning position as the end point, and define the heuristic function , where, and are the horizontal and vertical coordinates of the current node n respectively, and are the horizontal and vertical coordinates of the target ash cleaning position; the cost function g(n) is the actual movement cost from the starting point to the current node n, and the comprehensive cost function f(n) = g(n) + h(n). The A* algorithm selects the node with the smallest f(n) value for expansion to plan the path.

[0054] In this application, the fuzzy control algorithm for temperature and humidity regulation specifically includes:

[0055] S11, Fuzzification: Divide and into 7 fuzzy subsets of Negative Big (NB), Negative Medium (NM), Negative Small (NS), Zero (ZE), Positive Small (PS), Positive Medium (PM), and Positive Big (PB) respectively. Determine their membership degrees on the fuzzy subsets according to the actual measured values. The membership degree function uses a triangular function or a trapezoidal function, and divide the air velocity adjustment amount ΔV and the heating power adjustment amount ΔP into the corresponding fuzzy subsets;

[0056] S12, Set fuzzy rules: Develop a fuzzy rule table based on the flue-cured tobacco process and experience, covering various combinations of temperature and humidity deviations;

[0057] It should be noted that during the tobacco leaf baking process, different temperature and humidity conditions have a significant impact on the quality of tobacco leaves; setting fuzzy rules is a key link in the fuzzy control algorithm. Based on the flue-cured tobacco process and long-term accumulated practical experience, for various combinations of the temperature difference and the humidity difference , determine the corresponding air inlet fan air velocity adjustment amount ΔV and the air source heat pump heating power adjustment amount ΔP, so as to achieve precise temperature and humidity regulation; The following are examples of some fuzzy rules:

[0058] When is Positive Big (PB) and is Positive Big (PB): It indicates that the current temperature is much higher than the set temperature, and at the same time the humidity is also much higher than the set humidity; At this time, in order to quickly reduce the temperature and humidity, strong adjustment measures need to be taken; Therefore, the fuzzy rule sets ΔV to Positive Big (PB), that is, significantly increase the air velocity of the air inlet fan to accelerate the air circulation to take away heat and moisture; ΔP is Negative Big (NB), that is, significantly reduce the heating power of the air source heat pump, or even stop heating; This can quickly improve the overheated and overhumid situation in the flue-cured tobacco barn 1 and prevent the tobacco leaves from being damaged due to unsuitable temperature and humidity;

[0059] When is Positive Small (PS) and When it is Negative Small (NS): It means the temperature is slightly higher than the set temperature, while the humidity is slightly lower than the set humidity; in this case, large adjustments are not required; therefore, the fuzzy rule sets ΔV to Positive Small (PS) to slightly increase the air inlet fan speed to slightly reduce the temperature; ΔP is set to Zero (ZE) to maintain the current heating power of the air source heat pump, maintain the existing temperature, and at the same time use ventilation to remove excess heat, so that the temperature and humidity gradually tend to the set values;

[0060] When is Zero (ZE) and is Positive Big (PB): It indicates that the temperature just reaches the set value, but the humidity is much higher than the set humidity; at this time, the humidity problem should be emphasized; therefore, the fuzzy rule sets ΔV to Positive Big (PB) to increase the air inlet fan speed to quickly discharge the humid air; ΔP is set to Zero (ZE) to keep the current temperature unchanged, avoid affecting the temperature stability by adjusting the heating power, and reduce the humidity through ventilation;

[0061] S13, Defuzzification: The centroid method is used to convert the fuzzy output into an accurate value, and the calculation formula is: , where is the membership degree of the output variable under a certain fuzzy subset, , are the values of the air speed adjustment amount and the heating power adjustment amount under the corresponding fuzzy subsets, and n is the number of fuzzy subsets participating in the calculation; ΔV and ΔP obtained through calculation are used to control the operation of the air inlet fan and the air source heat pump to achieve precise temperature and humidity adjustment.

[0062] After the tobacco material baking is completed and taken out, the ash cleaning process is triggered, specifically:

[0063] For the initial ash cleaning operation, control the moving part 6 to reciprocate a set distance on the guide rail 5 at the set moving speed, and control the ash cleaning component to perform the ash cleaning operation;

[0064] Among them, the ash cleaning operation is specifically: Start the motor 8, drive the driven disk 10 to rotate through the connecting plate 12. Three support shafts are equidistantly arranged on the driven disk 10, so that the connecting block 11 drives the ash loading tray to move accordingly. At the same time, the rotating shaft on the top surface of the connecting plate 12 is rotationally connected to the ash loading tray, so that the brush barrel 9 on the rotating shaft brushes off the dust on the inner wall of the flue-cured tobacco barn 1, and the ash loading tray synchronously collects the brushed-off dust to prevent the dust from flying again;

[0065] After the initial ash cleaning is completed, obtain the visual information of the top of the tobacco curing barn 1, where the visual information can be obtained by means such as laser measurement or image recognition. Determine the areas that are not completely cleaned based on the visual information of the top of the tobacco curing barn 1, and select the target ash cleaning positions according to the positions of the areas that are not completely cleaned and the guide rail 5. If there are target ash cleaning positions, perform a primary ash cleaning control operation, plan the movement path of the moving part 6 based on the A* algorithm. When the moving part 6 moves within a set distance from the target ash cleaning position, start the ash cleaning component until all target ash cleaning positions are completely cleaned. If there are no target ash cleaning positions, it means that the ash cleaning is completed.

[0066] It should be noted that the ash cleaning process of the present invention can effectively remove the accumulated ash in the tobacco curing barn 1 through reasonable control logic and operation steps, ensuring the normal operation of the tobacco curing barn 1 and the quality of subsequent baking operations. In the whole ash cleaning process, although some existing conventional technologies are involved, the innovation of the present invention lies in the organic combination of these technologies and the realization of efficient and intelligent ash cleaning operations through unique control methods and processes.

[0067] In this application, after the initial ash cleaning is completed, the specific acquisition logic for selecting the target ash cleaning positions is as follows:

[0068] Obtain the visual image of the top of the tobacco curing barn 1 for preprocessing to enhance the contrast of the image. Adopt the threshold segmentation algorithm, convert the image from the RGB color space to the grayscale space to obtain the grayscale image I(x, y), where x and y respectively represent the horizontal and vertical coordinates of the pixel points in the image, and I(x, y) is the grayscale value of the pixel point (x, y) in the grayscale image. Set a grayscale threshold T, and perform binary processing on the image through the following formula:

[0069] , in the binary image B(x, y), the pixel points with a value of 1 represent the areas where dust may exist;

[0070] Perform morphological operations on the binary image, including erosion and dilation, to remove isolated noise points and fill the holes in the dust areas to obtain a more accurate dust area image D(x, y);

[0071] Count the connected regions with a pixel value of 1 in D(x, y), and determine the connected regions with an area greater than the set area threshold as the areas that are not completely cleaned. Denote each area that is not completely cleaned as , j = 1, 2,..., g, where g is the number of areas that are not completely cleaned, and j represents the number of the area that is not completely cleaned;

[0072] For each area that is not completely cleaned, traverse all the pixel points (x c , y c ) within the area;

[0073] Represent the position information of the guide rail 5 in the image in the form of a line segment. Identify the positions that coincide with the line segment corresponding to the guide rail 5 in the area where the ash cleaning is not complete, and denote the set of all such coincident positions as ;

[0074] After obtaining the set of positions where the area where the ash cleaning is not complete coincides with the guide rail 5 , obtain the current position of the moving part 6 and denote it as , calculate the Euclidean distance d from each point in to the current position of the moving part 6. The formula is: , traverse all the points in, find the point with the minimum distance d, and use it as the end point of this ash cleaning and denote it as the target ash cleaning position .

[0075] It should be noted that although the techniques involved in the above process, such as image preprocessing, threshold segmentation, morphological operations, and Euclidean distance calculation, belong to existing conventional image processing and calculation methods, the innovation of this application lies in the organic combination of these techniques to form a complete logic for obtaining the target ash cleaning position for the ash cleaning scenario of the tobacco curing barn 1; in this way, according to the actual situation of the tobacco curing barn 1, the area where the ash cleaning is not complete and the target ash cleaning position can be accurately and efficiently determined from the visual image, providing precise guidance for the subsequent ash cleaning control operation, thereby improving the effect and efficiency of the entire ash cleaning process; in order to highlight the core innovation content of the present invention, the specific implementation details of these conventional techniques are not elaborated in detail.

[0076] In this application, after completing an ash cleaning task, evaluate the ash cleaning effect. The evaluation indicators include the difference in dust concentration before and after ash cleaning, the dust collection amount of the ash carrier tray, and the number of target ash cleaning positions;

[0077] Perform weighted calculation on the difference in dust concentration before and after ash cleaning, the dust collection amount of the ash carrier tray, and the number of target ash cleaning positions to obtain the ash cleaning effect value; if the ash cleaning effect value is less than its ash cleaning effect threshold, perform a secondary ash cleaning control operation; it should be noted that the ash cleaning effect threshold is a reference value preset according to the actual use requirements and production standards of the tobacco curing barn 1; when the ash cleaning effect value is lower than this threshold, it indicates that the current ash cleaning operation fails to meet the expected cleaning standard and there may be an incomplete ash cleaning situation, and a secondary ash cleaning control operation is required; the secondary ash cleaning control operation will re-plan the ash cleaning path, adjust the working parameters of the ash cleaning components, and perform the ash cleaning operation on the tobacco curing barn 1 again to ensure that the ash cleaning effect meets the requirements.

[0078] The working principle of an air source heat pump tobacco curing barn with internal circulation dehumidification and its control method provided by the present invention is as follows:

[0079] Principle of temperature and humidity regulation: During the tobacco leaf baking process, the temperature and humidity sensors collect the temperature and humidity data in the tobacco baking room 1 in real time;

[0080] The system calculates the difference between the actual temperature and the set temperature and the difference between the actual humidity and the set humidity ; and and are used as the input variables of the fuzzy control algorithm. According to the fuzzification rules, they are respectively divided into the corresponding fuzzy subsets, and the membership degrees on each fuzzy subset are determined; based on the pre-established fuzzy rule table, combined with and belonging to the fuzzy subsets, the fuzzy outputs of the air inlet fan speed adjustment amount ΔV and the air source heat pump heating power adjustment amount ΔP are determined; the fuzzy outputs are defuzzified through the centroid method to obtain the accurate values of ΔV and ΔP; according to the calculation results, the speed of the air inlet fan 2 and the heating power of the air source heat pump are controlled to achieve precise regulation of the temperature and humidity in the tobacco baking room 1, meeting the strict requirements of the tobacco leaves for temperature and humidity at different baking stages.

[0081] Principle of ash cleaning: When the tobacco materials are taken out after baking is completed, the system triggers the ash cleaning process; during the initial ash cleaning, the moving part 6 reciprocates on the guide rail 5 at a set speed, driving the ash cleaning component to work; the motor 8 drives the connecting plate 12 and the driven disk 10 to rotate, the connecting block 11 drives the ash loading tray to move, the brush barrel 9 rotates to brush off the ash accumulated on the inner wall of the tobacco baking room 1, and the ash loading tray collects the dust;

[0082] After the initial ash cleaning is completed, the visual information at the top of the tobacco baking room 1 is obtained; the visual image is processed to determine the area where the ash cleaning is not complete, and the target ash cleaning position is selected in combination with the position of the guide rail 5;

[0083] Based on the A* algorithm, with the current position of the moving part 6 as the starting point and the target ash cleaning position as the end point, by calculating the heuristic function h(n), the cost function g(n) and the comprehensive cost function f(n), the node with the smallest f(n) value is selected for expansion to plan the moving path of the moving part 6;

[0084] When the moving part 6 moves within a set distance from the target ash cleaning position, the ash cleaning component is started again for ash cleaning operation;

[0085] After completing an ash cleaning task, by evaluating the difference in dust concentration before and after ash cleaning, the dust collection amount of the ash loading tray and the number of target ash cleaning positions, the ash cleaning effect value is calculated; if the ash cleaning effect value is less than the ash cleaning effect threshold, the secondary ash cleaning control operation is executed, the path is re-planned and the parameters of the ash cleaning component are adjusted, and ash cleaning is performed again until the ash cleaning effect meets the requirements, ensuring the cleanliness of the inside of the tobacco baking room 1 and reducing the impact of dust on subsequent baking operations.

[0086] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. An air source heat pump flue-cured tobacco barn with internal circulation dehumidification, comprising a flue-cured tobacco barn (1), characterized in that, A circulation component is installed on the flue-cured tobacco barn (1). A hinge seat is welded on the outer wall at one end of the flue-cured tobacco barn (1). A sealed door (3) is hinged on the hinge seat. An operating platform (4) is embedded on one side of the sealed door (3). Two guide rails (5) are symmetrically arranged on the inner wall of the top of the flue-cured tobacco barn (1). A plurality of positioning pins for fixing are equidistantly arranged in the guide rails (5). A moving part (6) is slidably arranged on the two guide rails (5). A cross plate (7) is fixedly connected to the moving part (6) by bolts. A dust cleaning component is installed on the cross plate (7). An air source heat pump is arranged in the flue-cured tobacco barn (1), and a temperature and humidity sensor is installed inside the flue-cured tobacco barn (1) for real-time monitoring of the temperature and humidity data in the barn.

2. The air source heat pump tobacco curing barn capable of internal circulation dehumidification according to claim 1, wherein The dust cleaning component includes a motor (8). The output shaft of the motor (8) penetrates to the top of the cross plate (7). A shaft sleeve is arranged at the connection between the output shaft of the motor (8) and the cross plate (7). The output end of the motor (8) is fixedly connected to a connecting plate (12). The other end of the connecting plate (12) is fixedly connected to a driven disc (10). Three support shafts are equidistantly arranged on the driven disc (10). Connecting blocks (11) are rotatably connected to the support shafts. The driven disc (10) on the top of the connecting plate (12) is connected to a dust-carrying tray through the connecting blocks. A rotating shaft is arranged on the top end face of the connecting plate (12). The rotating shaft is rotatably connected to the dust-carrying tray. One end of the rotating shaft is fixedly connected to a brush barrel (9).

3. The air source heat pump flue-cured tobacco barn capable of internal circulation dehumidification according to claim 1, characterized in that, The circulation component includes an air inlet fan (2) installed on one side of the flue-cured tobacco barn (1), and a ventilation fan is installed on the other side of the flue-cured tobacco barn (1).

4. A control method for an air source heat pump flue-cured tobacco barn with internal circulation dehumidification according to any one of claims 1-3, characterized in that, It includes temperature and humidity adjustment control and dust cleaning control operations; The temperature and humidity adjustment control specifically adopts a fuzzy control algorithm. The specific steps are as follows: Obtain the actual temperature and actual humidity inside the flue-cured tobacco barn (1), and record the difference between the actual temperature and the set temperature as the temperature difference , and record the difference between the actual humidity and the set humidity as the humidity difference ; The input variables are defined as the temperature difference and humidity difference in the flue-cured tobacco barn (1), and the output variables are the air speed adjustment amount ΔV of the air inlet fan and the heating power adjustment amount ΔP of the air source heat pump. The ash cleaning control operation uses the A* algorithm to plan the movement path of the ash cleaning component. The top guide rail (5) of the flue-cured tobacco barn (1) is divided into a grid map. Starting from the current position of the moving part (6) and ending at the target ash cleaning position, a heuristic function is defined , where and are the horizontal and vertical coordinates of the current node n respectively, and are the horizontal and vertical coordinates of the target ash cleaning position; the cost function g(n) is the actual movement cost from the starting point to the current node n, and the comprehensive cost function f(n) = g(n) + h(n). The A* algorithm selects the node with the smallest f(n) value for expansion to plan the path.

5. The control method of the air source heat pump flue-cured tobacco barn capable of internal circulation dehumidification according to claim 4, characterized in that, The fuzzy control algorithm for the temperature and humidity adjustment control specifically includes: S11, Fuzzification: and are respectively divided into seven fuzzy subsets: negative large, negative medium, negative small, zero, positive small, positive medium, and positive large. Determine their membership degrees on the fuzzy subsets according to the actual measured values. The membership degree function uses a triangular function or a trapezoidal function, and the wind speed adjustment amount ΔV and the heating power adjustment amount ΔP are divided into corresponding fuzzy subsets; S12, setting fuzzy rules: formulating a fuzzy rule table according to the flue-cured tobacco process and experience, covering various combinations of temperature and humidity deviations; S13, Defuzzification: The centroid method is used to convert the fuzzy output into an exact value. The calculation formula is: , , where is the membership degree of the output variable under a certain fuzzy subset, , are the values of the air velocity adjustment amount and the heating power adjustment amount under the corresponding fuzzy subsets, and n is the number of fuzzy subsets participating in the calculation; the operation of the intake fan and the air source heat pump is controlled by the calculated ΔV and ΔP to achieve precise temperature and humidity regulation.

6. The control method of the air source heat pump flue-cured tobacco barn capable of internal circulation dehumidification according to claim 4, wherein, After the tobacco materials are baked and taken out, a dust cleaning process is triggered. Specifically: For the initial dust cleaning operation, control the moving part (6) to reciprocate a set distance on the guide rail (5) at a set moving speed, and control the dust cleaning component to perform dust cleaning operations; After the initial dust cleaning is completed, obtain the visual information of the top of the flue-cured tobacco barn (1). Determine the area where the dust cleaning is not complete according to the visual information of the top of the flue-cured tobacco barn (1). Select the target dust cleaning position according to the position of the area where the dust cleaning is not complete and the guide rail (5); if there is a target dust cleaning position, perform a dust cleaning control operation once, plan the moving path of the moving part (6) based on the A * algorithm. When the moving part (6) moves within a set distance from the target dust cleaning position, start the dust cleaning component until all target dust cleaning positions are dust cleaned; if there is no target dust cleaning position, it means that the dust cleaning is completed.

7. The control method of the air source heat pump flue-cured tobacco barn capable of internal circulation dehumidification according to claim 6, characterized in that, After the initial dust cleaning is completed, the specific acquisition logic for selecting the target dust cleaning position is: Obtain the visual image of the top of the flue-cured tobacco barn (1) for preprocessing to enhance the contrast of the image. Adopt the threshold segmentation algorithm to convert the image from the RGB color space to the grayscale space to obtain the grayscale image I(x, y), where x and y respectively represent the horizontal and vertical coordinates of the pixel points in the image; set a grayscale threshold T, and perform binary processing on the image through the following formula: , in the binary image B(x, y), the pixel points with a value of 1 represent the areas where dust may exist; Perform morphological operations on the binary image, including erosion and dilation, to remove isolated noise points and fill the holes in the dust area, and obtain a more accurate dust area image D(x, y); Count the connected regions in D(x, y) where the pixel value is 1, and determine the connected regions with an area greater than the set area threshold as the regions that are not completely cleaned of ash; Denote each incomplete dust cleaning area as , where \(j = 1,2,\cdots,g\), \(g\) is the number of incomplete dust cleaning areas, and \(j\) represents the number of the incomplete dust cleaning area; For each area where the dust cleaning is not complete, traverse all the pixel points (x c , y c ) within the area; The position information of the guide rail (5) in the image is represented in the form of a line segment. The position where the line segment corresponding to the guide rail (5) coincides in the area where the dust cleaning is not complete is identified as the coincidence position, and the set of all coincidence positions is denoted as ; After obtaining the set of positions where the incompletely cleaned area coincides with the guide rail (5) the current position of the moving part (6) is obtained and denoted as , calculate the Euclidean distance d from each point in to the current position of the moving part (6), and the formula is: , traverse all the points in, find the point with the minimum distance d, and use it as the end point of this ash cleaning and denote it as the target ash cleaning position .

8. The control method of the air source heat pump flue-cured tobacco barn capable of internal circulation dehumidification according to claim 6, characterized in that, After completing a dust cleaning task, evaluate the dust cleaning effect. The evaluation indicators include the difference in dust concentration before and after dust cleaning, the dust collection amount of the ash tray, and the number of target dust cleaning positions; Perform weighted calculation on the difference in dust concentration before and after dust cleaning, the dust collection amount of the ash tray, and the number of target dust cleaning positions to obtain the dust cleaning effect value; if the dust cleaning effect value is less than its dust cleaning effect threshold, perform the secondary dust cleaning control operation.

Images