Near infrared spectrum acquisition accessory device for whole flue-cured tobacco leaves

Abstract

The utility model discloses a near-infrared spectrum acquisition accessory device for a whole flue-cured tobacco leaf, which is used for improving the stability and accuracy of near-infrared spectrum acquisition of the whole flue-cured tobacco leaf. The device comprises a primary flue-cured tobacco leaf flattening machine, a primary flue-cured tobacco leaf near infrared spectrum probe placing hole, a sampling hole lightproof dark box, a primary flue-cured tobacco leaf belt conveyor and a distance positioning groove. According to the near infrared spectrum acquisition accessory device for the whole flue-cured tobacco, the surface flatness of the flue-cured tobacco during near infrared spectrum acquisition is ensured, the distance between the spectrograph probe and the flue-cured tobacco is not changed, and the interference of external stray light on spectrum acquisition is eliminated; the stability and accuracy of near infrared spectrum collection of the whole flue-cured tobacco can be effectively improved, and a foundation is laid for follow-up quality evaluation of the flue-cured tobacco based on near infrared spectrum analysis.

Description

Technical Field

[0001] The utility model relates to the technical field of detection devices, in particular to a near-infrared spectrum collection accessory device for a whole piece of freshly cured tobacco leaves. Background Art

[0002] First-cured tobacco leaves refer to the tobacco leaves that are harvested from fresh tobacco (Nicotiana tabacum L.) grown in the field and then subjected to specific curing process conditions (temperature, humidity, time, etc.). They are an important raw material for cigarette production.

[0003] Near-infrared (NIR) spectrum, a specific wavelength range (780-2526 nm), reflects the molecular spectroscopy of hydrogen bonds within compounds. Near-infrared spectroscopy of fresh-cured tobacco leaves, combined with chemometric models, can accurately and rapidly determine the qualitative and quantitative information of various chemical components (nicotine, total nitrogen, total sugars, reducing sugars, pH, potassium ions, chloride ions, polyphenols, pigments, and aroma components), providing a reference for quality evaluation of fresh-cured tobacco leaves. Near-infrared spectroscopy offers advantages such as accuracy, rapidity, environmental friendliness, and the absence of organic reagent contamination, making it suitable for rapid online measurements. Accurate and stable NIR spectral acquisition of tobacco leaves is essential for the accurate determination of chemical components in fresh-cured tobacco leaves. Near-infrared spectroscopy can be acquired in transmission, reflection, and transflection modes. Reflection mode is commonly used for NIR spectroscopy of fresh-cured tobacco leaves. Therefore, various factors influencing NIR reflectance spectroscopy acquisition (such as the energy stability of the spectrometer light source, the accuracy of the spectrometer's wavelength separation, and the surface smoothness of the measurement object) determine the accuracy and stability of NIR spectroscopy of fresh-cured tobacco leaves.

[0004] Since the freshly-cured tobacco leaves will shrink to a certain extent during the baking process and the degree of shrinkage varies, the auxiliary device that improves the flatness of the entire freshly-cured tobacco leaves is of great significance to improving the accuracy and stability of near-infrared spectrum acquisition of the entire freshly-cured tobacco leaves.

[0005] In order to solve the above problems, the present utility model is proposed. Utility Model Content

[0006] The technical problem that the utility model intends to solve is: how to effectively improve the surface flatness of the whole piece of freshly cured tobacco leaves during the near-infrared spectrum collection process, and enhance the accuracy and stability of its near-infrared spectrum collection.

[0007] The present invention provides a solution to the above-mentioned technical problems: an auxiliary device for collecting near-infrared spectra of whole freshly cured tobacco leaves, wherein a freshly cured tobacco leaf flattening machine uses external mechanical force to ensure the flatness of the whole freshly cured tobacco leaf during near-infrared spectrum collection. In order to prevent the whole freshly cured tobacco leaf from returning to a wrinkled state after being flattened and to ensure the flatness of the surface of the whole freshly cured tobacco leaf during near-infrared spectrum collection, multiple freshly cured tobacco leaf flattening machines are used in combination, and the distance between the freshly cured tobacco leaf flattening machines and the distance between the freshly cured tobacco leaf flattening machines and the light-proof darkroom for placing the near-infrared probe and sampling holes is controlled at the same time. Before collecting the near-infrared spectrum of the whole freshly cured tobacco leaf, a rubber flattening curtain is further installed at the front end of the darkroom for placing the near-infrared probe and sampling to ensure the flatness of the whole freshly cured tobacco leaf.

[0008] To improve the mechanical flattening effect of the flue-cured tobacco leaf flattener, multiple flattening surfaces are used around the circumference. The distance between the flattening surfaces and the flue-cured tobacco leaf conveyor belt can be adjusted to ensure a better fit between the flattening surfaces and the flue-cured tobacco leaf surface. An electric rotary force is applied to the rotating shaft of the flue-cured tobacco leaf flattener, and the number of flue-cured tobacco leaf flatteners can be adjusted.

[0009] To eliminate the influence of external stray light when collecting near-infrared spectra from whole fresh-cured tobacco leaves, a probe placement hole was designed to match the near-infrared spectrometer probe. The hole's shape, length, and width can be adjusted based on the probe's dimensions without leaking light. The hole's depth can be adjusted based on the intensity of the probe's light source and the sensitivity of the detector. Once determined, the shape, length, width, and depth remain unchanged. The dark box for the probe placement hole and sampling hole for the fresh-cured tobacco leaves is made of opaque material.

[0010] The first aspect of the utility model provides a near-infrared spectrum collection accessory device for whole freshly-cured tobacco leaves, which is used in conjunction with a near-infrared spectrometer probe for collecting near-infrared spectra of freshly-cured tobacco leaves. The accessory device comprises a freshly-cured tobacco leaf flattening machine 1, a light-proof dark box 2 for placing a near-infrared spectrum probe and a sampling hole for freshly-cured tobacco leaves, a freshly-cured tobacco leaf belt conveyor 3, and a distance positioning slot 4.

[0011] The freshly cured tobacco leaf flattening machine 1, the freshly cured tobacco leaf near-infrared spectrum probe placement hole and the light-proof dark box 2 for the sampling hole are located directly above the freshly cured tobacco leaf belt conveyor 3;

[0012] The fixed ends of the freshly cured tobacco leaf flattening machine 1, the freshly cured tobacco leaf near-infrared probe placement hole and the sampling hole light-proof dark box 2 are placed in the distance positioning groove 4;

[0013] There are one or more first-cured tobacco leaf flattening machines 1 .

[0014] Preferably, the first-cured tobacco leaf flattening machine 1 comprises a flattening shaft 11, a central shaft 12, height position fixing bolts 13 and a column 14;

[0015] The flattening shaft 11 is connected to the upright post 14 via the central shaft 12 and the height fixing bolts 13. The rotation direction of the flattening shaft 11 is opposite to the conveying direction of the freshly cured tobacco leaves on the freshly cured tobacco leaf belt conveyor 3.

[0016] The bottom surface of the upright post 14 is placed in the distance positioning groove 4 as the fixed end of the primary-cured tobacco leaf flattening machine 1 .

[0017] Preferably, the flattening shaft 11 has a flattening plane 111 , and the number of the flattening planes 11 is adjusted within a circumferential range.

[0018] Preferably, the column 14 has a height adjustment slot 141 , and the height position fixing bolt 13 is adjusted up and down in the height adjustment slot 141 to adjust the distance between the flattening shaft 11 and the surface of the primary-cured tobacco belt conveyor 3 .

[0019] Preferably, the light-proof dark box 2 for placing the near-infrared spectrum probe and sampling hole of the newly-cured tobacco leaves has a near-infrared spectrometer probe placing hole 21, a near-infrared spectrometer probe sampling hole 22, a flattening curtain 23 and a support column 24. The flattening curtain 23 is located at one end of the light-proof dark box 2 for placing the near-infrared spectrum probe and sampling hole of the newly-cured tobacco leaves, close to the newly-cured tobacco leaf flattening machine 1. The bottom surface of the support column 24 is placed in the distance positioning groove 4 as the fixed end of the light-proof dark box 2 for placing the near-infrared spectrum probe and sampling hole of the newly-cured tobacco leaves.

[0020] The shape, length, width and dimensions of the near-infrared spectrometer probe placement hole 21 can be adjusted according to the size of the near-infrared spectrometer probe under the principle of light leakage matching. The depth of the near-infrared spectrometer probe placement hole 21 can be adjusted according to the strength of the near-infrared spectrometer probe light source and the sensitivity of the near-infrared spectrometer detector, and its shape, length, width and depth dimensions remain unchanged after being determined according to the situation of the near-infrared spectrometer probe.

[0021] The near-infrared spectrometer probe sampling hole 22 is convenient for sampling the freshly cured tobacco leaf sample after the near-infrared spectrum is collected.

[0022] Preferably, the flattening curtain 23 is made of rubber.

[0023] Preferably, the material of the light-proof dark box 2 for placing the near-infrared spectrum probe hole and the sampling hole of the first-cured tobacco leaves is a light-proof material.

[0024] Preferably, the bottom surface of the light-proof dark box 2 for placing the near-infrared spectrum probe and the sampling hole for the fresh-cured tobacco leaves is open, and the distance from the opening to the surface of the fresh-cured tobacco leaf belt conveyor 3 is controlled within 5 cm. The bottom surface of the light-proof dark box 2 for placing the near-infrared spectrum probe and the sampling hole for the fresh-cured tobacco leaves faces the fresh-cured tobacco leaf belt conveyor 3.

[0025] Preferably, the freshly-cured tobacco leaf belt conveyor 3 includes a drive motor 31 and a conveyor belt 32. The drive motor 31 drives the conveyor belt 32 to move, thereby moving the entire freshly-cured tobacco leaf on the conveyor belt 32 through the freshly-cured tobacco leaf flattening machine 1 and the freshly-cured tobacco leaf near-infrared spectrum probe placement hole and sampling hole opaque darkroom 2. The width and length of the conveyor belt 32 are adjustable.

[0026] Preferably, the distance between the plurality of the first-cured tobacco leaf flatteners 1 is adjusted by adjusting the distance between the fixed ends of the plurality of the first-cured tobacco leaf flatteners 1 in the distance positioning groove 4;

[0027] The distance between the primary-cured tobacco leaf flattening machine 1 and the primary-cured tobacco leaf near-infrared spectrum probe placement hole and the sampling hole opaque dark box 2 is adjusted by adjusting the distance between the fixed end of the primary-cured tobacco leaf flattening machine 1 and the fixed end of the primary-cured tobacco leaf near-infrared spectrum probe placement hole and the sampling hole opaque dark box 2 in the distance positioning groove 4.

[0028] The beneficial effects of the present invention on near-infrared spectrum acquisition of whole fresh-cured tobacco leaves include: high surface flatness of the whole fresh-cured tobacco leaf during near-infrared spectrum acquisition, consistent optical path lengths from the light source in the near-infrared spectrometer probe to the surface of the fresh-cured tobacco leaf, and consistent optical path lengths from the surface of the fresh-cured tobacco leaf to the detector of the near-infrared spectrometer, all of which ensure accurate and stable near-infrared spectrum acquisition of the whole fresh-cured tobacco leaf. The details are as follows:

[0029] First, the present invention adopts the following methods to ensure the smoothness of the surface of the entire freshly cured tobacco leaf during near-infrared spectrum acquisition: (1) multiple freshly cured tobacco leaf flattening machines are used in combination; (2) the distance between the lowest horizontal flattening plane of the freshly cured tobacco leaf flattening machine and the freshly cured tobacco leaf belt conveyor is adjustable; (3) a rubber flattening curtain is further provided at the front end of the freshly cured tobacco leaf near-infrared probe placement hole and the sampling hole dark box; and (4) the distance between the freshly cured tobacco leaf flattening machines and between the freshly cured tobacco leaf flattening machine and the freshly cured tobacco leaf near-infrared probe placement hole and the sampling hole dark box is adjustable.

[0030] Secondly, the present invention sets a relatively fixed height placement position for the spectrometer probe to ensure that the distance between the spectrometer probe and the fresh-cured tobacco leaves remains unchanged when collecting the near-infrared spectrum of the fresh-cured tobacco leaves.

[0031] Thirdly, the utility model patent prevents external stray light from interfering with the near-infrared spectrum collection of freshly-cured tobacco leaves, and sets up a light-proof dark box for placing the near-infrared spectrum probe of freshly-cured tobacco leaves and the sampling hole.

[0032] In summary, the utility model provides an accessory device for collecting near-infrared spectra of whole freshly cured tobacco leaves, which can effectively improve the stability and accuracy of collecting near-infrared spectra of whole freshly cured tobacco leaves by ensuring the surface flatness of the freshly cured tobacco leaves during near-infrared spectrum collection, maintaining a constant distance between the spectrometer probe and the freshly cured tobacco leaves, and eliminating the interference of external stray light on spectrum collection, thereby laying a foundation for subsequent quality evaluation of freshly cured tobacco leaves based on near-infrared spectroscopy analysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural diagram of the present utility model.

[0034] Figure 2 The utility model is a structural schematic diagram of a primary flue-cured tobacco leaf flattening machine.

[0035] Figure 3 The utility model is a schematic diagram of the light-proof dark box structure for placing holes and sampling holes of near-infrared spectrum probes for freshly cured tobacco leaves.

[0036] Names of the reference numerals in the accompanying drawings: 1-primary flue-cured tobacco leaf flattening machine, 11-flattening shaft, 12-center shaft, 13-height position fixing bolt, 14-column, 111-flattening plane of the flattening shaft, 141-height adjustment slot;

[0037] 2-lightproof dark box for placing near-infrared spectrometer probe and sampling hole for flue-cured tobacco leaves, 21-near-infrared spectrometer probe placement hole, 22-near-infrared spectrometer probe sampling hole, 23-flattening curtain, 24-support column;

[0038] 3-primary flue-cured tobacco leaf belt conveyor, 31-driving motor, 32-transmission belt;

[0039] 4-Distance positioning groove. DETAILED DESCRIPTION

[0040] The present invention will be described in further detail below with reference to the embodiments.

[0041] Those skilled in the art will understand that the following examples are intended only to illustrate the present invention and should not be construed as limiting the scope of the present invention. Where specific techniques or conditions are not specified in the examples, the techniques or conditions described in literature in the art or in accordance with the product specifications were followed. Materials or equipment used, where the manufacturer is not specified, are commercially available conventional products.

[0042] Those skilled in the art will appreciate that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present utility model refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we say that an element is "connected" to another element, it can be directly connected to the other element, or there may be intermediate elements. In addition, the "connection" used here may include wireless connection.

[0043] In the description of this utility model, unless otherwise specified, "plurality" means two or more. Terms such as "inner," "upper," and "lower" indicating positions or states are based on the positions or states shown in the accompanying drawings and are intended solely to facilitate and simplify the description of this utility model. They do not indicate or imply that the devices or components referred to must have a specific position, be constructed, or operate in a specific position. Therefore, they should not be construed as limitations on this utility model.

[0044] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "provided with" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0045] Those skilled in the art will understand that, unless otherwise defined, all terms used herein, including technical and scientific terms, have the same meaning as those generally understood by those skilled in the art in the field to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with those in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as such herein.

[0046] Example

[0047] The present invention will be further described with reference to the accompanying drawings and embodiments. The basic components in the accompanying drawings only illustrate components related to the present invention.

[0048] This embodiment is a near-infrared spectrum acquisition accessory device for whole freshly-cured tobacco leaves, which is used in conjunction with a near-infrared spectrometer probe to acquire near-infrared spectra of freshly-cured tobacco leaves. The device comprises a freshly-cured tobacco leaf flattening machine 1, a light-proof dark box 2 for placing the freshly-cured tobacco leaf near-infrared spectrum probe and sampling holes, a freshly-cured tobacco leaf belt conveyor 3, and a distance positioning slot 4.

[0049] The freshly cured tobacco leaf flattening machine 1, the freshly cured tobacco leaf near-infrared spectrum probe placement hole and the light-proof dark box 2 for the sampling hole are located directly above the freshly cured tobacco leaf belt conveyor 3;

[0050] The fixed ends of the freshly cured tobacco leaf flattening machine 1, the freshly cured tobacco leaf near-infrared probe placement hole and the sampling hole light-proof dark box 2 are placed in the distance positioning groove 4;

[0051] There are 2 first-cured tobacco leaf flattening machines 1.

[0052] The primary flue-cured tobacco leaf flattening machine 1 comprises a flattening shaft 11, a central shaft 12, height position fixing bolts 13 and a column 14;

[0053] The flattening shaft 11 is connected to the upright post 14 via the central shaft 12 and the height fixing bolts 13. The rotation direction of the flattening shaft 11 is opposite to the conveying direction of the freshly cured tobacco leaves on the freshly cured tobacco leaf belt conveyor 3.

[0054] The bottom surface of the upright column 14 is placed in the distance positioning groove 4 as the fixed end of the primary-cured tobacco leaf flattening machine 1 .

[0055] The flattening shaft 11 has a flattening plane 111. In the example shown, the flattening planes of the first-cured tobacco leaf flattening machine shaft are 12 surfaces around the circumference. Two first-cured tobacco leaf flattening machines are used together to make the surface of the first-cured tobacco leaves smoother.

[0056] The column 14 has a height adjustment slot 141 , and the height position fixing bolt 13 is adjusted up and down in the height adjustment slot 141 to adjust the distance between the flattening shaft 11 and the surface of the primary-cured tobacco belt conveyor 3 .

[0057] The light-proof dark box 2 for placing the near-infrared spectrum probe and sampling hole of the newly-cured tobacco leaves is provided with a near-infrared spectrometer probe placing hole 21, a near-infrared spectrometer probe sampling hole 22, a flattening curtain 23 and a support column 24. The flattening curtain 23 is located at one end of the light-proof dark box 2 for placing the near-infrared spectrum probe and sampling hole of the newly-cured tobacco leaves, close to the newly-cured tobacco leaf flattening machine 1. The bottom surface of the support column 24 is placed in the distance positioning groove 4 as the fixed end of the light-proof dark box 2 for placing the near-infrared spectrum probe and sampling hole of the newly-cured tobacco leaves.

[0058] The material of the flattening curtain 23 is rubber.

[0059] The material of the light-proof dark box 2 for placing the near-infrared spectrum probe hole and the sampling hole of the first-cured tobacco leaf is light-proof material.

[0060] The bottom surface of the light-proof dark box 2 for placing the near-infrared spectrum probe and sampling holes for the fresh-cured tobacco leaves is open, and the distance from the opening to the surface of the fresh-cured tobacco leaf belt conveyor 3 is controlled within 5 cm. The bottom surface of the light-proof dark box 2 for placing the near-infrared spectrum probe and sampling holes for the fresh-cured tobacco leaves faces the fresh-cured tobacco leaf belt conveyor 3.

[0061] The first-cured tobacco leaf belt conveyor 3 includes a drive motor 31 and a conveyor belt 32. The drive motor 31 drives the conveyor belt 32 to move, thereby moving the entire first-cured tobacco leaf on the conveyor belt 32 through the first-cured tobacco leaf flattening machine 1 and the first-cured tobacco leaf near-infrared spectrum probe placement hole and sampling hole opaque dark box 2. The width and length of the conveyor belt 32 are adjustable.

[0062] The distance between the multiple primary-cured tobacco leaf flatteners 1 is adjusted by adjusting the distance between the fixed ends of the multiple primary-cured tobacco leaf flatteners 1 in the distance positioning groove 4;

[0063] The distance between the primary-cured tobacco leaf flattening machine 1 and the primary-cured tobacco leaf near-infrared spectrum probe placement hole and the sampling hole opaque dark box 2 is adjusted by adjusting the distance between the fixed end of the primary-cured tobacco leaf flattening machine 1 and the fixed end of the primary-cured tobacco leaf near-infrared spectrum probe placement hole and the sampling hole opaque dark box 2 in the distance positioning groove 4.

[0064] Specifically, such as Figure 1 The figure shows a schematic diagram of the structure of a near-infrared spectrum collection accessory device for whole-piece fresh-cured tobacco leaves. The accessory for collecting near-infrared spectrum of whole-piece fresh-cured tobacco leaves includes a fresh-cured tobacco leaf flattening machine, a light-proof dark box for placing near-infrared spectrum probes and sampling holes, a fresh-cured tobacco leaf belt conveyor and a fresh-cured tobacco leaf flattening machine, a light-proof dark box for placing near-infrared spectrum probes and sampling holes, and a distance positioning groove for the location. Figure 2 This is a schematic diagram of a first-cured tobacco leaf flattening machine. Figure 3 This is a schematic diagram of the light-proof dark box for placing the near-infrared probe hole and the sampling hole for freshly-cured tobacco leaves, showing the structural details of the above two parts respectively.

[0065] In the example shown, the flattening surfaces of the flue-cured tobacco leaf flattening machine's rotating shaft are 12 planes around the circumference. Two flue-cured tobacco leaf flattening machines are used in conjunction to achieve a smoother surface. When the flattening surfaces of the flue-cured tobacco leaf flattening machines reach their lowest point, the distance from the belt is 2 cm. The center-to-center distance between the two flue-cured tobacco leaf flattening machines is 40 cm. The distance from the center of the second flue-cured tobacco leaf flattening machine to the flattening curtain of the opaque darkroom for the near-infrared probe and sampling holes is 50 cm. The distance from the bottom surface of the opaque darkroom for the near-infrared probe and sampling holes to the conveyor belt is 4 cm.

[0066] The workflow for collecting near-infrared spectra of whole fresh-cured tobacco leaves is as follows: first, the whole fresh-cured tobacco leaves are placed on the belt of the fresh-cured tobacco leaf belt conveyor. After being flattened by two fresh-cured tobacco leaf flattening machines, they enter the light-proof dark box with the near-infrared spectrum probe placement hole and sampling hole. The near-infrared spectrum probe is connected to collect the near-infrared spectrum of the whole fresh-cured tobacco leaves. If further analysis of the fresh-cured tobacco leaf samples collected by the spectrum is necessary, sampling is performed at the sampling hole.

[0067] This utility model utilizes multiple multi-flattening surface fresh-cured tobacco leaf flatteners combined with a rubber flattening curtain to effectively ensure the smoothness of the entire fresh-cured tobacco leaf surface during near-infrared spectroscopy acquisition. The light-tight dark box housing the near-infrared spectrum probe and the sampling hole ensures consistent optical path lengths from the near-infrared spectrometer probe's light source to the fresh-cured tobacco leaf surface, and from the fresh-cured tobacco leaf surface to the near-infrared spectrometer's detector. The sampling hole facilitates sampling for subsequent analysis.

[0068] The utility model can realize continuous and automatic collection of near-infrared spectra of multiple whole pieces of freshly-cured tobacco leaves, and improves the working efficiency of spectrum collection of whole pieces of freshly-cured tobacco leaves while ensuring the accuracy and stability of spectrum collection.

[0069] The above embodiments illustrate the technical concept and structural features of the present invention, and are intended to enable experts in related fields to understand and implement the present invention. Any equivalent or modified versions made based on the present invention shall be included within the scope of protection of the present invention.

Claims

1. A near infrared spectrum collection accessory device for whole flue-cured tobacco leaves, characterized in that: It comprises a flue-cured tobacco leaf flattening machine (1), a light-proof dark box (2) for placing holes for flue-cured tobacco leaf near-infrared spectrum probes and sampling holes, a flue-cured tobacco leaf belt conveyor (3) and a distance positioning groove (4); The first-cured tobacco leaf flattening machine (1), the first-cured tobacco leaf near-infrared spectrum probe placement hole and the sampling hole light-proof dark box (2) are located directly above the first-cured tobacco leaf belt conveyor (3); The fixed ends of the freshly cured tobacco leaf flattening machine (1), the freshly cured tobacco leaf near-infrared probe placement hole, and the sampling hole light-proof dark box (2) are placed in the distance positioning groove (4); There are one or more first-cured tobacco leaf flattening machines (1).

2. The near-infrared spectrum acquisition accessory device for whole flue-cured tobacco leaves according to claim 1, characterized in that: The primary flue-cured tobacco leaf flattening machine (1) comprises a flattening rotating shaft (11), a central rotating shaft (12), height position fixing bolts (13) and a column (14); The flattening shaft (11) is connected to the upright column (14) via the central shaft (12) and the height position fixing bolt (13), and the rotation direction of the flattening shaft (11) is opposite to the conveying direction of the freshly cured tobacco leaves on the freshly cured tobacco leaf belt conveyor (3); The bottom surface of the upright column (14) is placed in the distance positioning groove (4) as the fixed end of the primary-cured tobacco leaf flattening machine (1).

3. The near-infrared spectrum acquisition accessory device for whole flue-cured tobacco leaves according to claim 2, characterized in that: The flattening shaft (11) is provided with a flattening shaft flattening plane (111), and the number of the flattening shaft flattening planes (111) is adjusted within a circumferential range.

4. The near-infrared spectrum acquisition accessory device for whole freshly cured tobacco leaves according to claim 2, characterized in that: The column (14) is provided with a height adjustment slot (141), and the height position fixing bolt (13) is adjusted up and down in the height adjustment slot (141) to adjust the distance between the flattening shaft (11) and the surface of the primary-cured tobacco leaf belt conveyor (3).

5. The accessory device for collecting near-infrared spectra of whole freshly cured tobacco leaves according to claim 1, characterized in that: The light-proof dark box (2) for placing the near-infrared spectrum probe and sampling holes of the first-cured tobacco leaves is provided with a near-infrared spectrometer probe placement hole (21), a near-infrared spectrometer probe sampling hole (22), a flattening curtain (23) and a support column (24); the flattening curtain (23) is located at one end of the light-proof dark box (2) for placing the near-infrared spectrum probe and sampling holes of the first-cured tobacco leaves, close to the first-cured tobacco leaf flattening machine (1); the bottom surface of the support column (24) is placed in the distance positioning groove (4) as the fixed end of the light-proof dark box (2) for placing the near-infrared spectrum probe and sampling holes of the first-cured tobacco leaves.

6. The accessory device for collecting near-infrared spectra of whole freshly cured tobacco leaves according to claim 5, characterized in that: The material of the flattening curtain (23) is rubber; The material of the light-proof dark box (2) for placing the near-infrared spectrum probe hole and the sampling hole of the newly cured tobacco leaf is a light-proof material.

7. The accessory device for collecting near-infrared spectra of whole freshly cured tobacco leaves according to claim 1, characterized in that: The bottom surface of the light-proof dark box (2) is open for placing the near-infrared spectrum probe and sampling holes of the freshly cured tobacco leaves, and the distance from the opening to the surface of the freshly cured tobacco leaf belt conveyor (3) is controlled within 5 cm.

8. The accessory device for collecting near-infrared spectra of whole freshly cured tobacco leaves according to claim 1, characterized in that: The first-cured tobacco leaf belt conveyor (3) comprises a driving motor (31) and a conveyor belt (32). The driving motor (31) drives the conveyor belt (32) to move, thereby driving the entire first-cured tobacco leaf on the conveyor belt (32) to pass through the first-cured tobacco leaf flattening machine (1) and the first-cured tobacco leaf near-infrared spectrum probe placement hole and sampling hole opaque dark box (2).

9. The accessory device for collecting near-infrared spectra of whole freshly cured tobacco leaves according to claim 1, characterized in that: The distance between the plurality of the first-cured tobacco leaf flatteners (1) is adjusted by adjusting the distance between the fixed ends of the plurality of the first-cured tobacco leaf flatteners (1) in the distance positioning groove (4); The distance between the first-cured tobacco leaf flattening machine (1) and the first-cured tobacco leaf near-infrared spectrum probe placement hole and the sampling hole light-proof dark box (2) is adjusted by adjusting the distance between the fixed end of the first-cured tobacco leaf flattening machine (1) and the fixed end of the first-cured tobacco leaf near-infrared spectrum probe placement hole and the sampling hole light-proof dark box (2) in the distance positioning groove (4).

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