CN114659994B - Tobacco foreign matter extraction and detection system - Google Patents

Abstract

A tobacco foreign matter extraction and detection system is disclosed, comprising: a closed gas analysis area (8), which includes: a hyperspectral analyzer; and a mucous membrane (11), which moves in the gas analysis area and passes through the hyperspectral analyzer The irradiated area; the gas collection branch pipe (3), which is inserted into the tobacco raw material to collect the gas; and the centrifuge (12), which provides the kinetic energy of the gas flow for the system, so that the gas collection branch pipe can continuously collect the gas inside the tobacco raw material, and make the gas Flow to the mucous membrane of the gas analysis area, compare the spectral curve image detected by the hyperspectral analyzer with the foreign matter spectral curve image marked in the computer, and judge whether there is foreign matter in the tobacco and the type of foreign matter according to the comparison result. The invention can comprehensively and accurately detect the foreign matter inside the tobacco raw material.

Description

Tobacco foreign matter extraction and detection system

technical field

The invention relates to the detection of foreign matter such as tobacco mold.

Background technique

In the tobacco processing industry, the quality of tobacco raw materials is directly related to the quality of cigarette products, and even to the health of cigarette smokers. Tobacco is often mixed with foreign matter such as tobacco leaves and hemp during the process of harvesting and transportation. If the temperature and humidity of the environment are not well controlled, molds will also be produced in tobacco, such as aflatoxin, Aspergillus niger, Aspergillus florida, Penicillium chrysogenum, Rhizopus stolonifer, etc. Aspergillus toxin is one of the most toxic compounds in nature. It is a toxic secondary metabolite produced by some Aspergillus fungi. It has strong carcinogenicity (can induce liver cancer), mutagenicity and teratogenicity to humans. Among the dozens of aflatoxins known at present, aflatoxin B1 (AFB1) is the most toxic. After contaminating tobacco raw materials, even if the content is one part per billion (ppb level), long-term consumption will cause human health problems. die. Aspergillus flavus has the characteristics of rapid colony growth, not compact structure, gray-green on the front, colorless or slightly brown on the reverse. It is mainly spread in the air by conidia, which is easy to contaminate nearby materials, and can spread rapidly in a large area. It is very important to ensure the quality of tobacco to use an economical and efficient detection method to detect foreign matter such as tobacco leaves, hemp silk and other foreign substances mixed with tobacco raw materials and the resulting mold.

SUMMARY OF THE INVENTION

The invention provides a tobacco foreign matter extraction and detection system, which uses a centrifuge to provide flowing gas, so that the gas flows from the inside of the tobacco to the mucous membrane of the closed space, and the mucous membrane absorbs the foreign matter in the gas from the tobacco raw material, and then uses a hyperspectral analyzer to detect The deposits on the mucous membrane are detected, so as to comprehensively and accurately reflect the types of foreign bodies in the tobacco raw materials, and improve the product quality of tobacco products.

According to an aspect of the embodiments of the present invention, a tobacco foreign body extraction and detection system is provided, including:

an enclosed gas analysis zone comprising: a hyperspectral analyzer; and a mucous membrane that moves in the gas analysis zone and passes through the irradiated region of the hyperspectral analyzer;

A gas collection branch pipe, which is inserted into the tobacco raw material to collect gas, the gas collection branch pipe has micropores that can allow fungal spores to enter the pipe and filter out other bulky foreign matter, and the gas collection branch pipe is in fluid communication with the gas analysis area. and a centrifuge, which provides the kinetic energy of the gas flow for the system, so that the gas collection branch pipe can continuously collect the gas inside the tobacco raw material, and make the gas flow on the mucous membrane of the gas analysis zone,

Compare the spectral curve image detected by the hyperspectral analyzer with the foreign matter spectral curve image marked in the computer, and determine whether there is foreign matter in the tobacco and the type of the foreign matter according to the comparison result.

In some examples, the mucous membrane has a solid epoxy resin adhering to foreign matter from the gas inside the tobacco raw material.

In some examples, the substrate carrying the epoxy resin solid glue on the adhesive film is black.

In some examples, the inlet and outlet of the mucous membrane of the gas analysis zone have rollers that move the mucous membrane, and the rollers of the inlet and the outlet maintain a differential speed to ensure the stability of the mucous membrane and the Surface roughness.

In some examples, the lower end of the gas collection branch pipe is a tapered structure.

In some examples, the bottom of the gas collection manifold has a cavity for collecting a sample of tobacco raw material.

In some examples, the gas collection manifold is provided on a lift.

In some examples, the lifting device is provided with a flexible cover film covering the surface of the tobacco raw material near the gas collecting branch pipe as the gas collecting branch pipe descends.

In some examples, the lift device periodically inserts the gas collection manifold into the tobacco on the assembly line.

Description of drawings

In order to describe the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings of the embodiments will be briefly introduced below.

FIG. 1 is a schematic diagram of a tobacco foreign body extraction and detection system according to an embodiment of the present invention.

FIG. 2 is a schematic diagram of a gas collection branch pipe provided by an embodiment of the present invention.

FIG. 3 is a schematic diagram of the workflow of a tobacco foreign body extraction and detection system according to an embodiment of the present invention.

Detailed ways

The present invention uses the hyperspectral imaging (Hyperspectral Image) technology to finely reflect the foreign matter in the tobacco. Hyperspectral imaging is a comprehensive technology that integrates detector technology, precision optical machinery, weak signal detection, computer technology, and information processing technology. Hyperspectral imaging simultaneously detects the two-dimensional geometric space and one-dimensional spectral information of the target, and obtains continuous and narrow-band image data with high spectral resolution. It is a multi-dimensional information acquisition technology that combines imaging technology with spectral technology.

The electromagnetic wave wavelength range of hyperspectral imager is generally 10 ² nm to 10 ⁴ nm, which belongs to microwave, and its penetrating ability is poor, and its imaging ability for the interior of objects is even weaker. That is, the ability of the hyperspectral imager to analyze the material inside the object is not ideal. In the processing of tobacco raw materials, the raw materials are usually stacked together and transported on the conveyor belt of the assembly line in a relatively dense block form. Therefore, the raw materials on the assembly line cannot be directly detected by a hyperspectral imager.

FIG. 1 shows a tobacco foreign matter extraction and detection system. The system allows foreign matter to enter the detection area of the hyperspectral analyzer 13 by passing air into the tobacco, so as to realize fine reflection of foreign matter. As shown in FIG. 1 , the system includes a gas collection zone 1 and a gas analysis zone 8 . The centrifuge 12 provides the kinetic energy of the gas flow for the entire system, ensuring that the gas collection branch pipe 1 can continuously collect the gas inside the tobacco raw material and deliver it to the gas analysis zone 8 .

In the gas collection area 1, a plurality of gas collection branch pipes 3 are inserted into the tobacco raw material under the driving of the lifting device 6, and the conical head 2 at the lower end of the gas collection branch pipe 3 reduces the frictional resistance between the tobacco raw material and the branch pipes 3. The voids in the tobacco raw material near the branch pipe 3 are reduced. There is a small cavity at the bottom of the gas collection branch pipe 3, which can carry a part of the inner tobacco when moving inside the tobacco raw material, and conduct sampling externally.

The lifting device 6 can periodically raise and lower the gas collection manifold to achieve repeated insertion into the tobacco raw material, ensuring that the system can complete the inspection of batches of tobacco raw materials on the assembly line. And at the end of each cycle, a small chamber at the bottom of the gas collection branch pipe (as shown in Figure 2) is used to take out a part of the internal tobacco leaves for further testing, realizing the combination of random inspection and full inspection.

As shown in FIG. 2 , the surface of the gas collection branch pipe 3 used in the present invention is unevenly distributed with micro-scale pores, and the diameter of the pores can be 100 microns, but is not limited to this, so that the fungal spores (with a diameter of about 10 microns to 100 microns) into the gas collection branch pipe 3, while filtering out other bulky foreign objects. Since the texture of the area near the surface of the raw tobacco raw material is looser and the texture of the inner and bottom areas is tighter, this leads to differences in the air flow ability of the different areas. Therefore, based on the optimization module in the COMSOL simulation software, the variance of the air flow velocity in the collection area between the gas collection branch pipes 3 can be used as the optimization target to determine the distribution of micropores, including the number of micropores and the spacing of micropores. The smaller the variance, the more uniform the air velocity distribution and the more thorough the collection.

The surface of the tobacco raw material 1 is also covered with a flexible cover film 4 . The flexible covering film 4 covers the surface of the tobacco raw material 1 near the gas collecting branch pipe 3 as the gas collecting branch pipe 3 descends. The gas collection branch pipe 3 in the working state will cause the internal pressure of the tobacco raw material to decrease, so that the flexible cover film 3 is further attached to the tobacco raw material 1, thereby enhancing the air tightness of the area near the gas collection branch pipe 3 and reducing the inevitable vibration of the system during operation. Influence on the air tightness of the nearby area, the collected gas passes through the tobacco raw material 1 more, and carries the foreign matter inside the tobacco block.

While all the devices in the gas collection area 1 are working, all the devices in the gas analysis area 8 also keep working at the same time, so as to realize the real-time detection effect. The gas collection branch pipe 3 is communicated with the gas collection main pipe 5 , and the collected gas is quickly transported to the gas analysis area 8 through the flexible telescopic pipe 7 . The inner walls of the above-mentioned pipes 3, 5, and 7 are required to be flat and smooth, so as to avoid the stay or accumulation of foreign matter. The length of the flexible telescopic pipe 7 needs to comprehensively consider the length of the gas collection branch pipe 3 and the spatial layout of the entire system.

A mucous membrane 11 and a hyperspectral analyzer 13 are arranged in the gas gas analysis area 8 . The side of the mucous membrane 11 facing the flexible telescopic tube 7, that is, the windward side, is coated with a layer of epoxy resin solid glue, the thickness of which is greater than 0.5 mm, generally 1 mm thick. The epoxy resin solid glue is used to adhere foreign matter from the gas inside the tobacco raw material; the position of the mucous membrane 11 entering and leaving the gas analysis area 8 is equipped with a one-way valve to ensure the air tightness of the gas analysis area and avoid affecting the gas analysis. accuracy. The base of the mucous membrane 11 carrying the epoxy resin solid glue is selected in black to reduce the influence of invalid reflected light on the detection result. Driven by the roller 9, the mucous membrane 11 enters from one end of the gas analysis area 8 and leaves from the other end to realize the continuity of detection. The mucosa 11 is moved at a very low speed, such as 5 mm per second, but not limited thereto. In addition, the rollers 9 at both ends of the gas analysis area 8 maintain a certain differential speed, generally 0.5 mm/s, so as to exert tensile stress on the mucous membrane 11 to ensure the stability and surface flatness of the mucous membrane.

The mucosa 11 passes through the irradiation area of the hyperspectral analyzer 13, and the hyperspectral analyzer receives the reflected optical information to form an accurate and continuous spectral curve image. The collected hyperspectral data ranges from 400-1000 nm. In the process of collecting hyperspectral images of foreign objects in the air inside the tobacco raw material, in order to protect the health of the staff, the mucous membranes leaving the foreign object analysis area need to be centrally sealed. Acquire a hyperspectral image of the black mucous membrane as reference 1, turn off the light source and close the lens cap as reference 2, and correct the acquired hyperspectral image with reference 1 and reference 2 to suppress the instrument itself and the dark current band random noise. The reflectivity of the black substrate did not change much in different wavelength bands, and decreased slightly with the increase of wavelength, and then remained basically stable. Therefore, it is relatively easy to distinguish the spectral image of the foreign object, and compare it with the spectral curve image of the foreign object marked in the computer system. If the similarity is high, it is determined as the corresponding foreign object.

Referring to Fig. 3, the above-mentioned tobacco foreign matter extraction and detection system working method is as follows: the lifting device 6 drives the gas collection manifold 5 to move downward, inserts the gas collection branch pipe 3 into the tobacco raw material, and covers the flexible cover film 4 on the surface of the tobacco raw material; Start the centrifuge 12, the mucous membrane drum 9 and the hyperspectral analyzer 13, the gas analysis area 8 starts to receive the gas from the gas collection area 1, and adheres to the mucous membrane 11; the hyperspectral analyzer 13 analyzes the foreign matter in the detection area, and Compare the spectral curve image with the existing spectral image curve in the computer system to distinguish specific foreign objects.

Claims (9)

1. A tobacco foreign matter extraction and detection system, comprising:

a closed gas analysis zone comprising: a high spectrum analyzer; and a mucous membrane that moves in the gas analysis region and passes through the illuminated area of the high optical spectrum analyzer;

the gas collecting branch pipe is inserted into the interior of the tobacco raw material to collect gas, micropores capable of enabling spores of fungi to enter the pipe and filtering out other large-volume foreign matters are formed in the gas collecting branch pipe, and the gas collecting branch pipe is communicated with the gas analysis area in a fluid mode; and

a centrifuge providing kinetic energy of gas flow to the system, enabling the gas collection manifold to continuously collect gas from within the tobacco raw material and to flow the gas onto the mucosa of the gas analysis zone,

and comparing the spectral curve image formed by the high spectrum analyzer detection with the foreign matter spectral curve image marked in the computer, and judging whether foreign matters exist in the tobacco or not and the types of the foreign matters according to a comparison result.

2. The tobacco foreign matter extraction and detection system of claim 1, wherein the adhesive film has an epoxy resin solid glue adhering to foreign matter from gas inside the tobacco raw material.

3. The tobacco foreign matter extraction and detection system according to claim 2, wherein the substrate on the adhesive film supporting the epoxy resin solid glue is black.

4. The tobacco foreign matter extraction and detection system according to claim 2 or 3, wherein the inlet and outlet of the mucosa of the gas analysis area have rollers for moving the mucosa, and the rollers of the inlet and outlet are maintained at a differential speed to ensure the stability and surface flatness of the mucosa.

5. The tobacco foreign matter extraction and detection system of claim 1, wherein the lower end of the gas collection manifold is of a tapered configuration.

6. The tobacco foreign matter extraction and detection system of claim 1, wherein the bottom of the gas collection manifold has a cavity to collect a sample of tobacco raw material.

7. A tobacco foreign matter extraction and detection system according to claim 1 or 5 or 6, wherein the gas collecting branch is provided on a lifting device.

8. The tobacco foreign matter extraction and detection system of claim 7, wherein the lifting device is provided with a lifting device

There is a flexible cover film that covers the surface of the tobacco raw material in the vicinity of the gas collecting branch as it descends.

9. The tobacco foreign matter extraction and detection system of claim 7, wherein the lifting device periodically inserts the gas collection manifold into tobacco on a flow line.

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