Digital characterization detection device and method for flue-cured tobacco leaf oil content

Abstract

A digital characterization detection device and method for the oil content of flue-cured tobacco leaves are characterized in that the digital characterization detection device comprises a device base 1, a shell panel, a plurality of detection units and an industrial personal computer, the detection units are arranged side by side along the shell panel, and each detection unit comprises a pressure applying mechanism, a pressure bearing mechanism and a camera module. The camera module of the device can be used for recording an oil outlet picture after the tobacco leaves are pressed in real time, transmitting the oil outlet picture to the industrial personal computer, and comparing the oil outlet picture with a gray value and a reflectance standard value which are stored and marked in a database, so that the digital evaluation grade of the tobacco leaf oil content can be given. The device is simple in structure, capable of simultaneously detecting multiple samples, small in oil detection extrusion surface, small in influence of tobacco veins, high in oil extraction efficiency and low in detection cost.

Description

Technical Field

[0001] This invention belongs to the field of quality testing technology for flue-cured tobacco leaves. Specifically, it is a digital characterization and testing device and method for oil content in flue-cured tobacco leaves (manual pressure adjustment), or it can be said to provide a digital display testing device for oil content in flue-cured tobacco leaves. Background Technology

[0002] Tobacco oil content is a soft, semi-liquid or liquid substance within the cells of tobacco leaves. It reflects the degree of "oiliness, fullness, and dryness" on the appearance of tobacco leaves and is an inherent characteristic of tobacco leaves. To a large extent, it reflects the amount of aroma in the evaluation of tobacco quality, so this indicator is of great significance for the evaluation and assessment of tobacco quality.

[0003] In production practice, the assessment of the oil content of cured tobacco leaves is mostly done by experienced tobacco leaf appearance quality assessment experts who touch and visually inspect the leaves. Based on the leaf's softness, the amount of particles adhering to their hands, and their experience, they use qualitative terms such as "more," "quite a bit," "some," "slightly," and "few" to evaluate the oil content. In recent years, tobacco quality assessment has also adopted a 10-point system, converting the four levels of "more," "some," "slightly," and "few" into corresponding scores to represent oil content and evaluate tobacco quality. However, the subjective differences among experts make it difficult to maintain consistency in the oil content assessment process. Furthermore, this subjective quantitative description of tobacco leaf oil content remains ambiguous and unclear compared to objective, concise numerical representation methods.

[0004] With the development of digital and intelligent technologies, the method of judging the quality of tobacco leaves by touch and visual inspection, which has been used in the tobacco industry, also needs to be improved. There is an urgent need for specific, objective and accurate digital indicators to adapt to the digital and intelligent development of tobacco leaf quality evaluation and to achieve objective and accurate characterization.

[0005] Chinese invention patent CN105547992A discloses a continuous detection device for oil content in plant leaves, comprising a smooth pressing plate, a smooth carrier plate, a pressing plate driving unit, a carrier plate driving unit, a tension sensor, a processor, and a display unit. During detection, the tobacco leaf to be tested is placed flat on a monitoring area of ​​the smooth carrier plate. The pressing plate driving unit drives the smooth pressing plate to press down onto the smooth carrier plate (the lower surface of the smooth pressing plate is a smooth plane with a side length of 10-20 cm), squeezing out the oil from the tobacco leaf. Then, the smooth pressing plate is lifted upwards, and the tension sensor measures the tension when the tobacco leaf separates from the smooth pressing plate. After processing by the processor, the tension is compared with the tension of standard tobacco leaves (four grades: high, low, slightly high, low) after being pressed and expelled from the smooth pressing plate, stored in the data storage unit. This determines the grade of the oil content of the tobacco leaf and is further displayed on the display unit, thus grading and quality assessment of the tobacco leaf.

[0006] Subsequently, the smoothing carrier plate driving unit drives the smoothing carrier plate to rotate around its center, repeating the above actions to detect the tobacco leaves to be tested in the next detection area, thereby achieving continuous cyclic detection.

[0007] This patent has the advantages of low cost, objective results, and high efficiency. However, because this method involves pressing tobacco leaves between a smooth pressing plate and a smooth carrier plate, and using the tension when the tobacco leaf separates from the smooth pressing plate to represent the amount of oil in the tobacco leaf, the accuracy of the results is easily affected by the structure of the device itself. "The plate-shaped device structure has a large compression area, and the veins of slightly thicker tobacco leaves supported between the pressing plate and the smooth carrier plate have a significant impact on oil extraction. The oil extraction effect of the tobacco leaves after roasting is poor, and the gaps in the tobacco stem support when the pressing plate is lifted can easily allow air to enter, causing a decrease in tension during separation." Therefore, the accuracy of the test results is insufficient.

[0008] Therefore, in order to solve the above problems, it is essential to design a scientific and practical digital representation and detection device for the oil content of cured tobacco leaves, which is necessary for evaluating the quality of cured tobacco leaves. Summary of the Invention

[0009] The purpose of this invention is to overcome the shortcomings of existing technologies such as smooth pressure plates and smooth carrier plates, which have "large extrusion area (diameter greater than 10 cm) of plate-shaped device structure, and the large influence of slightly coarse tobacco leaf veins supported between the pressure plate and smooth carrier plate on oil extraction, resulting in poor oil extraction effect of roasted tobacco leaves". The invention provides a digital detection device and method that can detect multiple samples simultaneously, has a simple structure, a small oil extraction surface, is less affected by tobacco leaf veins, has high oil extraction efficiency, and is low in cost.

[0010] The principle behind this invention is that the oil content of tobacco leaves varies, resulting in different grayscale and reflectance values ​​in photographs of the compressed leaves. Representative tobacco leaves, specifically the highest quality leaves with the highest oil content, are used. The grayscale and reflectance values ​​of the leaves before and after prolonged compression are labeled as 0 and 10, respectively. The tobacco leaves are compressed, and photographs are taken at specific time intervals (e.g., every 0.1 hours) to record the oil extraction status. After image processing, the grayscale and reflectance values ​​for each time interval are labeled as step-like standard values. Each step reflects the oil extraction status of the tobacco leaves at different times, forming a fixed standard for judging the quality grade of tobacco leaf oil content. The result, displayed as a numerical value indicating the corresponding oil content, is obtained by comparing the grayscale and reflectance values ​​of the tested tobacco leaves to the step-like standard values.

[0011] The objective of this invention is achieved through the following technical solution: A digital characterization and detection device for the oil content of cured tobacco leaves includes a base, a housing panel, detection units, and an industrial control computer. Several detection units are arranged side-by-side along the housing panel. Each detection unit includes a pressure applying mechanism, a pressure bearing mechanism, and a camera module. The pressure applying mechanism includes a fixed upright plate, a linear drive module and a bracket on one side of the fixed upright plate, a guide shaft mounted in a guide bearing seat on the other side of the fixed upright plate, a connecting block at the upper end of the guide shaft, and a pressing contact head at the lower end. A manually adjustable weight is placed above the connecting block, and the connecting block extends through a slotted hole in the fixed upright plate to the bracket on the opposite side. The pressure bearing mechanism is a pressure-resistant transparent glass plate that supports the pressing contact head while pressing the tobacco leaves, positioned directly below the pressing contact head. The camera module is located below the pressure-resistant transparent glass plate and is used to capture real-time images of the pressed tobacco leaves and transmit them to the industrial control computer.

[0012] Furthermore, the bottom of the fixed plate is fixed to the device base, the fixed plate is fitted to the inner side of the shell panel, and the corresponding position of the shell panel is hollowed out to realize the fixation and movement of related components.

[0013] Furthermore, the bracket is fixed to the linear drive module, located below the connecting block and in contact with its lower surface.

[0014] Furthermore, the pressure-resistant transparent glass plate is mounted and fixed on the upper plate surface of the base.

[0015] Furthermore, the detection unit includes 2-10 units, which can simultaneously detect multiple tobacco leaf samples.

[0016] The present invention utilizes the above-mentioned device to perform a digital characterization of the oil content of cured tobacco leaves as follows: The tobacco sample to be tested is placed on a pressure-resistant transparent glass plate. The start detection switch is pressed, and the linear drive module moves the bracket downward. Due to gravity, the weight, connecting block, guide shaft, and pressing contact head are pressed onto the pressure-resistant transparent glass plate, and pressure is applied downward with the same pressure. After a set time, the camera module takes real-time photos of the compressed tobacco leaves and transmits the data to the industrial control computer. The industrial control computer compares the grayscale and reflectance values ​​of the compressed tobacco leaf photos with the grayscale and reflectance value step standard values ​​marked in the database, and gives a digital evaluation level of the oil content of the tobacco leaves. After the detection is completed, the linear drive module starts to move upward, moving the bracket upward and lifting the connecting block, weight, guide shaft, and pressing contact head upward, in preparation for the second detection.

[0017] Furthermore, the labeled grayscale and reflectance value tiered standard values ​​are obtained in the following way: After the tobacco grading expert team assigns a score to the oil content of the tiered tobacco samples, each tobacco sample is tested using the detection device of this invention, which manually adds weights to apply a fixed pressure, to obtain the corresponding grayscale and reflectance values ​​of the photographs. Tobacco samples from different origins and different tiered grades are collected and tested, and the resulting grayscale and reflectance values ​​are used as a database of tiered tobacco oil content standard values. The oil content standard value database corresponds to the specific scores assigned. The industrial control computer automatically compares the grayscale and reflectance values ​​of the tobacco leaves to be tested with the standard values ​​to display the specific oil content score.

[0018] The present invention is described in more detail below: The detection device of this invention consists of ten identical detection units, capable of simultaneously detecting ten tobacco leaf samples. The ten detection units are mounted on the base of the detection device. Each detection unit comprises 1. Pressure application unit: The fixed plate is fixed to the base; the linear drive module is fixed to the plate; the bracket is fixed to the linear drive module and located below the connecting block, detached from the connecting block, allowing the linear drive module to lift and push the connecting block upwards. The connecting block is installed and fixed above the guide shaft; the weight is located above the connecting block; the guide bearing seat is installed below the fixed plate and cooperates with the guide shaft. The guide shaft is connected to the lower pressure contact head, meaning that the movement of the linear drive module can realize the up and down movement of the lower pressure contact head to complete the application of pressure; the hydraulic contact head has a small diameter (1- 1.5 (cm), which helps the contact head avoid slightly larger leaf veins, ensuring uniform oil extraction from the tobacco leaves without being affected by the leaf veins. 2. Pressure-bearing unit: The pressure detection unit is equipped with an upward-facing pressure-resistant transparent glass plate and a camera module. The pressure-resistant transparent glass plate is installed and fixed on the upper plate of the base. After the weight applies pressure for a certain time, the camera module captures and records the state of the tobacco leaves after pressure is applied. The grayscale value and reflectance value of the tobacco leaves after pressure can be determined by image method and transmitted to the industrial control computer for comparison with the stepped standard value, giving a digital evaluation level of the amount of tobacco oil.

[0019] The specific characterization method of this invention is as follows: The applied pressure is adjusted by manually adding or removing weights, so that the detection device squeezes the tobacco leaves with different levels of oil content assigned by experts to obtain the corresponding series of gray values ​​and reflectance values ​​as step comparison standard values. The detection device squeezes the oil content of the first-cured tobacco leaves to be tested for a predetermined time. The camera module records the gray value and reflectance value of the pressed oil sample. The industrial control computer automatically compares the gray value and reflectance value recorded by the camera obtained from the test with the standard value and gives the corresponding oil content score value.

[0020] The advantages of this invention compared to existing technologies are: simple structure, simultaneous detection of multiple samples, small oil extraction surface with minimal influence from tobacco leaf veins, high oil extraction efficiency, and low detection cost. The device's camera module records real-time photos of the oil extracted from the tobacco leaves after pressure application, transmitting them to an industrial control computer. By comparing these photos with standard grayscale and reflectance values ​​stored in a database, a numerical evaluation of the tobacco leaf's oil content can be provided. Characterizing the oil content of cured tobacco leaves using digital indicators is more objective and accurate, and allows for continuous, cyclical detection, making it highly efficient and rapid. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall external structure of the present invention; Figure 2 This is an isometric view of the overall external structure of the present invention; Figure 3 This is a schematic diagram of a single detection unit structure; Figure 4 for Figure 3 The left view; Figure 5 Axonometric view of a single detection unit; Figure 6 Images of oil seepage under pressure from three grades of tobacco leaves (X2F, C3F, and B2F) from Mazhen Town, Shixing County, Shaoguan City, Guangdong Province. Figure 7 Images of oil seepage from three grades of tobacco leaves (X2F, C3F, and B2F) in Xiaonanhai Town, Nanzheng County, Hanzhong City, Shaanxi Province, under pressure. Figure 8 Images of oil seepage from three grades of tobacco leaves (X2F, C3F, and B2F) in Tangjie Town, Jia County, Pingdingshan City, Henan Province, under pressure; Figure 1-5Components: 1. Base; 2. Housing panel; 3. Pressure detection unit; 3.1. Fixed upright plate (3.1 is the main internal support located inside the panel); 3.2. Linear drive module; 3.3. Bracket; 3.4. Connecting block; 3.5. Weight; 3.6. Guide shaft; 3.7. Guide bearing seat; 3.8. Downward contact head; 3.9. Pressure-resistant transparent glass plate; 3.10. Camera module; 3.11. Strip hole; 4. Smoke sheet; 5. Industrial computer. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments: like Figure 1-5 As shown: A digital characterization and detection device for the oil content of cured tobacco leaves includes a base 1, a housing panel 2, detection units 3, and an industrial control computer 5. The detection units comprise 10 units arranged side-by-side along the housing panel. Each detection unit includes a pressure applying mechanism, a pressure bearing mechanism, and a camera module. The pressure applying mechanism (see...) Figure 3 The system includes a fixed upright plate 3.1, a linear drive module 3.2 and a bracket 3.3 disposed on one side of the fixed upright plate 3.1, and a guide bearing seat disposed on the other side of the fixed upright plate 3.1. 3.7 guide shaft in 3.6 and the connecting block set at the upper end of the guide shaft 3.4 and the lower end of the guide shaft pressing contact head 3.8 Connecting block 3.4 Placed above You can manually increase or decrease The weights, and the connecting block passes through the strip hole on the fixed upright plate 3.1. 3.11 Extending to the top of the bracket on the opposite side ； The pressure-bearing mechanism is located directly below the pressure contact head and consists of a pressure-resistant transparent glass plate that supports the pressure contact head in pressing the tobacco leaves. The camera module is located below the pressure-resistant transparent glass plate and is used to take real-time photos of the pressed tobacco leaves and transmit them to the industrial control computer.

[0023] Furthermore, the bottom of the fixed plate 3.1 is fixed to the device base 1, the fixed plate 3.1 is fitted to the inner side of the shell panel 2, and the corresponding position of the shell panel 2 is hollowed out to realize the fixation and movement of related components.

[0024] Furthermore, the bracket 3.3 is fixed to the linear drive module 3.2, located below the connecting block and in contact with its lower surface.

[0025] The single detection unit of the present invention consists of the following parts 1. The pressure application unit consists of the following components: 3.1 Fixed upright plate, 3.2 Linear drive module, 3.3 Bracket, 3.4 Connecting block, 3.5 Weight, 3.6 Guide shaft, 3.8 Downward pressure oil contact head.

[0026] 2. Pressure-bearing unit A pressure-resistant transparent glass plate 3.9 is mounted on the base panel, with a camera module 3.10 located below it. The pressing contact head 3.8 of a single detection unit presses the tobacco leaf onto the pressure-resistant transparent glass plate, and the camera module 3.10 records the state of the tobacco leaf after pressure is applied in real time. Finally, the amount of e-liquid after pressure is applied to the tobacco leaf 4 is determined to judge its quality.

[0027] 3. Different pressure settings for tobacco leaves from different regions and of different types: The weight 3.5 can be manually added or reduced to adjust the pressure required by different regions, types or parts of the tobacco leaves.

[0028] 4. The industrial computer 5 is a control system and can perform image processing, such as comparing and displaying the grayscale value, reflectance value, and step standard value of the image.

[0029] 6. Camera module The camera module located below the tobacco sheet is an integrated camera and light source. It takes photos of the tobacco sheet by shooting upwards, and then processes and compares the images. After pressure is applied and activated, the camera takes a photo of the compressed tobacco sheet at a set time and transmits the photo to the industrial control computer. The industrial control computer processes and compares the image data of the compressed photo, and determines the oil content based on the grayness and reflectivity of the oil after it is released from the blade under pressure for a certain period of time.

[0030] Example: 1. Sample preparation: The tobacco leaves to be tested were placed in a constant temperature and humidity chamber at 22℃±0.5℃ and 60%±1% relative humidity for 48 hours to equilibrate and ensure that the basic quality of the tobacco leaves was consistent before testing.

[0031] Cut from the upper two-fifths of the tobacco leaf, between the veins, near the outer edge of the leaf. 2 Use tobacco leaves that are approximately 3 cm square. Take two small tobacco samples from each leaf in symmetrical positions. Take at least nine samples from each tobacco leaf. 2 A small piece of tobacco sample, about 3 cm square, represents one tobacco leaf sample.

[0032] 2. Three leaves from each tobacco leaf sample 2 Small smoke samples, approximately 3 cm square, are neatly stacked and placed on an upward-facing contact glass plate. The pressure unit applies pressure, and the lower camera begins to take pictures at regular time intervals.

[0033] The stacked small smoke samples were pressed down to the set point by the pressure device. timeThe tobacco oil seeps out, soaking through the three layers of tobacco leaves. The originally opaque layers of tobacco leaves are permeated by the oil squeezed out under pressure. When pressure is applied, the camera module located below the glass plate begins to take pictures (see...). Figure 6-8 The camera module captures and records the state of the tobacco leaf after pressure is applied. The image method can be used to determine the amount of tobacco oil in the tobacco leaf after pressure, as well as the grayness or reflectivity of the tobacco leaf, and thus give a numerical value of the amount of oil, which is used to evaluate the quality of the tobacco leaf.

[0034] 3. One sample contains nine pieces. 2 Three small tobacco samples, each about 3 cm square, were stacked together for one measurement. The same tobacco sample was measured three times, and the average of the three measurements was taken as the oil content of the tobacco sample.

[0035] 4. The weights can be manually adjusted according to different types of tobacco leaves, or different regions or parts of the same type of tobacco (flue-cured tobacco).

Claims

1. A digital characterization and detection device for oil content in flue-cured tobacco leaves, characterized in that: The device includes a base (1), a housing panel (2), a detection unit (3), and an industrial control computer (5). Several detection units (3) are arranged side-by-side along the housing panel (2). Each detection unit (3) includes a pressure applying mechanism, a pressure bearing mechanism, and a camera module (3.10). The pressure applying mechanism includes a fixed upright plate (3.1), a linear drive module (3.2) and a bracket (3.3) located on one side of the fixed upright plate, a guide shaft (3.6) mounted in a guide bearing seat (3.7) on the other side of the fixed upright plate, and connecting blocks (3.4) and connecting blocks respectively located on the upper end of the guide shaft. The lower end of the pressing contact head (3.8) has a weight (3.5) that can be manually added or removed placed above the connecting block (3.4), and the connecting block (3.4) extends to the position above the bracket (3.3) on the opposite side through the strip hole (3.11) on the fixed plate (3.1); the pressure bearing mechanism is a pressure-resistant transparent glass plate (3.9) that supports the pressing contact head (3.8) to press the tobacco leaf (4), and is set directly below the pressing contact head (3.8); the camera module (3.10) is set below the pressure-resistant transparent glass plate (3.9) and is used to take real-time photos of the pressed tobacco leaf and transmit them to the industrial control computer (5).

2. The digital characterization and detection device for oil content in flue-cured tobacco leaves according to claim 1, characterized in that: The bottom of the fixed plate (3.1) is fixed on the device base (1). The fixed plate (3.1) is attached to the inner side of the shell panel (2) and is hollowed out at the corresponding position of the shell panel (2) to realize the fixation and movement of related components.

3. The digital characterization and detection device for oil content in flue-cured tobacco leaves according to claim 1, characterized in that: The bracket (3.3) is fixed on the linear drive module (3.2), located below the connecting block (3.4) and in contact with its lower surface.

4. The digital characterization and detection device for oil content in flue-cured tobacco leaves according to claim 1, characterized in that: The detection unit (1) includes 2-10 units, which can detect multiple tobacco leaf samples simultaneously.

5. The digital characterization and detection device for oil content in flue-cured tobacco leaves according to claim 1, characterized in that: The pressure-resistant transparent glass plate (3.9) is installed and fixed on the upper plate surface of the base (1).

6. A method for detecting the oil content of cured tobacco leaves using the apparatus described in claim 1, characterized in that: The smoke sample (4) to be tested is placed on the pressure-resistant transparent glass plate (3.9). The start detection switch is pressed, and the linear drive module (3.2) moves the bracket (3.3) downwards. Due to gravity, the weight (3.5), connecting block (3.4), guide shaft (3.6), and pressing contact head (3.8) fall and press onto the pressure-resistant transparent glass plate (3.9), applying pressure downwards. At the set time, the camera module (3.10) takes real-time photos of the compressed smoke sample. The data is transmitted to the industrial control computer. The industrial control computer (5) compares the grayscale value and reflectance value of the pressed tobacco leaf photo with the grayscale value and reflectance value ladder standard value already marked in the database, and gives a numerical evaluation level of the tobacco leaf oil content. After the test is completed, the linear drive module (3.2) starts to move upward, driving the bracket (3.3) upward, and lifting the connecting block (3.4) together with the weight (3.5), guide shaft (3.6) and pressing contact head (3.8) upward, in preparation for the second test.

7. The detection method according to claim 6, characterized in that: The labeled grayscale and reflectance value tiered standard values ​​are obtained in the following way: After the tobacco grading expert team assigns specific scores to the oil content of the tiered tobacco samples, each tobacco sample is tested using the detection device of this invention, which manually adds weights to apply a fixed pressure, to obtain the corresponding grayscale and reflectance values ​​of the photographs. Tobacco samples from different origins and different tiered grades are collected and tested, and the resulting grayscale and reflectance values ​​are used as a database of tiered tobacco oil content standard values. The oil content standard value database corresponds to the assigned specific scores, and the industrial control computer automatically compares the grayscale and reflectance values ​​of the tobacco leaves to be tested with the standard values ​​to display the specific oil content score.

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