A method for detecting tobacco structure using liquid solvent

Abstract

The present invention relates to a method for detecting tobacco shreds structure using a liquid solvent, comprising collecting a set amount of tobacco shreds to be detected; preparing a solution with good separation properties for tobacco shreds; placing the solution in a container, and evenly placing the collected tobacco shreds to be detected in the solution; when the tobacco shreds to be detected are evenly dispersed in the solution, using an image acquisition system to collect images of the tobacco shreds to be detected in the solution; performing image processing and data analysis on the collected images, and outputting the structure or characteristic size of the tobacco shreds to be detected. The method for detecting tobacco shreds structure using a liquid solvent of the present technical solution can not only realize rapid detection of tobacco shreds structure, but also facilitate the formation of standard and consistent detection conditions by determining the liquid composition and particle velocity, thereby providing an effective means for accurately, efficiently and standardizedly evaluating tobacco shreds structure and characteristic size.

Description

Technical Field

[0001] The invention belongs to the field of cigarette making technology, in particular to the technical field of tobacco cut structure detection, and specifically to a method for detecting tobacco cut structure by using a liquid solvent. Background Art

[0002] At present, the changes in the whole-shred rate and broken-shred rate during cigarette processing are used to reflect the structural changes of tobacco. The 2016 edition of the Cigarette Process Specifications stipulates the definition of the change rate of the whole-shred rate and broken-shred rate. The determination method can be found in the tobacco industry standard YC / T178-2003, and the three-layer tobacco structure vibration sorting screen is used for detection. However, there are some problems in using the change rate of the whole-shred rate to reflect the changes in the tobacco structure: First, the current three-layer screen detection accuracy can no longer meet the actual rolling needs, and it is often the case that there is no change in the tobacco structure detection, but there is a significant difference in the rolling quality; second, the existing whole-shred rate test operation process is greatly affected by human factors; third, it can only be detected offline and cannot be fed back to the processing process in a timely manner.

[0003] At present, some cigarette manufacturers have begun to use ten-layer sieves to measure tobacco structure. The measurement method adopts the industry standard YC / T 351-2010 to calculate the characteristic size of tobacco to represent the tobacco structure. Although this method has significantly improved accuracy, the measurement process is complicated, the analysis process steps are cumbersome, and it cannot be produced online.

[0004] To solve the above problems, a variety of methods are currently being studied. For example, Chinese patent CN112255233A invented a real-time detection device and method for tobacco processing resistance based on two-dimensional fluidized bed high-speed imaging. This method uses a circulating fluidized bed system to transport tobacco, and a high-speed imaging system to complete image acquisition and processing, so that the characteristic dimensions of tobacco can be detected in batches and output.

[0005] Chinese patent CN115015242A invented a method of using a three-layer belt with a pneumatic blowing device to separate tobacco shreds, using an image acquisition device to collect and process images of scattered tobacco shreds, thereby achieving the purpose of online detection of tobacco shreds structure.

[0006] The above methods all have the disadvantages of requiring high acquisition frequency of imaging equipment and inaccurate actual results due to the breakage of tobacco during the flow process. How to use image detection to quickly detect the structure or characteristic size of tobacco and reduce the error caused by the breakage of tobacco during the detection process is a hot topic in this field. Summary of the invention

[0007] The present invention aims to provide a method for detecting the structure of cut tobacco by using a liquid solvent, so as to solve the current problems of slow speed and low accuracy in detecting the structure of cut tobacco.

[0008] To achieve the above objectives, this application is implemented through the following technical solutions:

[0009] A method for detecting the structure of tobacco shreds using a liquid solvent comprises the following steps:

[0010] S1. Collecting a set amount of tobacco to be tested;

[0011] S2, preparing a solution with good separation properties for tobacco shreds;

[0012] S3, placing the solution in a container, and evenly placing the tobacco to be tested collected in step S1 in the solution;

[0013] S4. When the tobacco to be tested is evenly dispersed in the solution, an image acquisition system is used to acquire an image of the tobacco to be tested in the solution;

[0014] S5. Perform image processing and data analysis on the collected images, and output the structure or characteristic size of the tobacco to be detected.

[0015] Furthermore, before step S1, the method further includes determining a standard image of the tobacco structure or characteristic size, and obtaining a standard image set.

[0016] Furthermore, the solution in step S2 is n-hexane or water.

[0017] Furthermore, in step S3, if the density of the solution is less than the density of the tobacco to be tested, the tobacco to be tested sinks; if the density of the solution is greater than the density of the tobacco to be tested, the tobacco to be tested is placed at the bottom of the container, or the tobacco to be tested is placed on the surface of the solution and then sealed and the container is inverted so that the tobacco floats from the bottom and is separated.

[0018] Furthermore, the container is in a rectangular thin-walled shape.

[0019] Furthermore, in step S4, if the tobacco to be detected is entangled, the solution is stirred before image acquisition to separate the tobacco to be detected.

[0020] Furthermore, the image acquisition system in step S4 includes an image acquisition device and an image processing device electrically connected to the image acquisition device.

[0021] Furthermore, the container also includes a water pump, and the output shaft of the water pump is located in the inner cavity of the container.

[0022] The beneficial effects of the present invention are:

[0023] The method of using liquid solvent to detect tobacco structure in the technical solution can not only realize rapid detection of tobacco structure, but also facilitate the formation of standard and consistent detection conditions by determining liquid composition and particle velocity, thereby providing an effective means for accurately, efficiently and standardized evaluation of tobacco structure and characteristic dimensions. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The figure is a schematic diagram of the implementation process of the detection method of the present invention.

[0025] Figure 2 Schematic diagram of the detection device in Example 1 of the present invention.

[0026] Figure 3 Schematic diagram of the detection device in Example 2 of the present invention.

[0027] Description of reference numerals:

[0028] 1. Container; 2. Tobacco to be tested; 3. Image acquisition device; 4. Image processing device; 10. Container; 20. Tobacco to be tested; 30. Image acquisition device; 40. Image processing device; 50. Water pump. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, but cannot be construed as limiting the technical solution of the present invention.

[0030] Before implementing this technical solution, it is necessary to determine a standard image, that is, according to production needs, a large number of tobaccos of different batches, different models, different origins, different formulations, etc. are tested and the tobacco structure is determined using the existing detection method. At the same time, the image acquisition system is used to collect the corresponding images for determining the tobacco structure or characteristic dimensions of a certain tobacco, and the collected multiple standard image sets are stored in the image processing device for comparison with the images obtained during the detection. In order to ensure the accuracy of the detection, the data of the image set needs to be as comprehensive as possible.

[0031] like Figure 1 As shown, the technical solution of the present application provides a method for detecting the structure of tobacco shreds using a liquid solvent, comprising the following steps:

[0032] S1. Collect a set amount of tobacco to be tested. In the technical solution of the present application, the amount collected can be 100 g to 1000 g, which is specifically determined according to the amount of the solution.

[0033] S2. Prepare a solution that has good separation properties for tobacco shreds, such as n-hexane or water, and of course other solutions. In the technical solution of this application, there is no clear requirement for the solution, as long as it can be separated from tobacco shreds and is colorless and easy to image detect. In actual use, when the solution has a large density, the tobacco shreds to be detected can rise quickly in the solution, or when the solution used has a small density, the tobacco shreds to be detected can fall quickly in the solution.

[0034] In the technical solution of the present application, the shape of the container for containing the solution is not limited, and its shape can be various, as long as it can separate the tobacco to be detected and facilitate image collection, such as the rectangular thin-walled container used in Example 1 below, or the annular container used in Example 2, etc.

[0035] S3. Place the solution in a container and evenly place the collected tobacco to be tested in the solution. If the density of the solution is less than that of the tobacco to be tested, the tobacco to be tested will sink. If the density of the solution is greater than that of the tobacco to be tested, the tobacco to be tested can be placed at the bottom of the solution, or placed on the surface of the solution and then sealed and the container inverted so that the tobacco to be tested floats from the bottom and is separated.

[0036] S4. When the tobacco to be tested is evenly dispersed in the solution, the image acquisition system collects the tobacco image. If the tobacco to be tested is entangled, the solution can be stirred to separate the tobacco to be tested before image acquisition. The photographing area should cover all the tobacco, and the tobacco to be tested should avoid overlapping. Since the tobacco moves slowly in the liquid, it is less broken, which can better reflect the real structure of the tobacco to be tested.

[0037] S5. Perform image processing and data analysis on the collected images, and output the tobacco structure or characteristic size.

[0038] Example 1

[0039] like Figure 2 As shown, 1000 ml of n-hexane is poured into container 1, and 200 g of tobacco to be tested is collected and evenly placed into the container inlet. 3 , which is smaller than ordinary tobacco, so tobacco will sink when put into it. When the tobacco to be detected 2 is evenly distributed in the solvent, the image of the tobacco is collected by the image acquisition device 3. If the tobacco is entangled or overlapped, the tobacco can be loosened by a stirring rod. Finally, the image data is transmitted to the image processing device 4 for analysis to obtain the structure and characteristic size of the tobacco.

[0040] When the density of the solvent is greater than that of the tobacco, the tobacco can be placed in the container, sealed and then inverted to separate the tobacco using buoyancy.

[0041] In this embodiment, the container is in a rectangular thin-walled shape. After the image acquisition device is connected to the image processing device through electrical signals, the lens is aimed at the container to acquire the image of the tobacco in the solution.

[0042] Example 2

[0043] Take 1000 ml of n-hexane and pour it into a circular thin-walled container, collect 500 g of tobacco to be tested, and evenly disperse it in the inlet of the container 10. Turn on the water pump 50 to push the solvent to rotate and flow around the circular container, so as to break up and separate the tobacco to be tested 20. When the tobacco to be tested is evenly distributed in the solvent, use the image acquisition device 30 to collect a 360° image of the tobacco to be tested. Finally, the image data is transmitted to the image processing device 40 for analysis to obtain the tobacco structure and characteristic size.

[0044] The above are only some specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, nor is the order of the embodiments limiting the present invention. Any technician familiar with the technical field of the present invention can easily make changes or substitutions within the technical scope reported in the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention is not limited to the above embodiments, but should be based on the protection scope of the claims.

Claims

1. A method for detecting tobacco cut structure using a liquid solvent, characterized in that: The following steps are involved: S1, collecting a set amount of tobacco to be tested; S2, preparing a solution of n-hexane or water having separation properties for shredded tobacco; S3, placing the solution in a container, and evenly placing the tobacco to be tested collected in step S1 in the solution; S4. When the tobacco to be tested is evenly dispersed in the solution, an image acquisition system is used to acquire an image of the tobacco to be tested in the solution; S5. Perform image processing and data analysis on the collected images, and output the structure or characteristic size of the tobacco to be detected.

2. The method for detecting tobacco shred structure using a liquid solvent according to claim 1, characterized in that: Before step S1, the method also includes determining a standard image of the tobacco structure or characteristic size and obtaining a standard image set.

3. The method for detecting tobacco shred structure using a liquid solvent according to claim 1, characterized in that: In step S3, if the density of the solution is less than the density of the tobacco to be tested, the tobacco to be tested sinks; if the density of the solution is greater than the density of the tobacco to be tested, the tobacco to be tested is placed at the bottom of the container, or the tobacco to be tested is placed on the surface of the solution and then sealed and the container is inverted so that the tobacco floats from the bottom and is separated.

4. The method for detecting tobacco shred structure using a liquid solvent according to claim 1, characterized in that: The container is in a rectangular thin-walled shape.

5. The method for detecting tobacco shred structure using a liquid solvent according to claim 1, characterized in that: In step S4, if the tobacco to be detected is entangled, the solution is stirred before image acquisition to separate the tobacco to be detected.

6. The method for detecting tobacco shred structure using a liquid solvent according to claim 1, characterized in that: The image acquisition system in step S4 includes an image acquisition device and an image processing device electrically connected to the image acquisition device.

7. The method for detecting tobacco cut structure using a liquid solvent according to claim 1, characterized in that: The container also includes a water pump, and the output shaft of the water pump is located in the inner cavity of the container.

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