A near-infrared screening device for soybean moldiness degree

Abstract

The utility model relates to soybean screening technical field, and disclose a kind of for soybean mould degree near-infrared screening device, including screening main part, screening main part includes optical equipment, optical equipment one end is equipped with lens piece, optical equipment one end is fixed with through surrounding, and the air passage of through surrounding inner wall is opened, and the inner surface of through surrounding is fixed with four side air storehouse, multiple air outlets are opened in the side of four side air storehouse close to lens piece, and the inner wall of four side air storehouse is hollow, and the through air passage of the inner wall of four side air storehouse and through surrounding inner wall is communicated. The utility model is through being provided by air pump, air connecting pipe, four side air storehouse and multiple air outlet components blow system, can automatically, continuously spray airflow to lens piece surface, effectively remove attached soybean powder, grease and dust, avoid pollutant attenuation near-infrared signal, introduce noise, to ensure that spectral data is authentic and reliable, and the accuracy and continuity of soybean mould degree screening are improved.

Description

Technical Field

[0001] This utility model belongs to the field of soybean screening technology, and specifically relates to a near-infrared screening device for the degree of mold growth in soybeans. Background Technology

[0002] Near-infrared screening devices for soybean mold levels are essentially based on near-infrared spectroscopy technology. They indirectly screen by detecting key indicators closely related to mold, such as moisture, protein, and oil.

[0003] In existing technologies, the cleanliness of the optical lens is crucial for ensuring the accuracy of detection data during the rapid and non-destructive screening of soybean mold using near-infrared spectroscopy. However, the optical lenses of current equipment are typically directly exposed to the detection environment, making them highly susceptible to adsorption of soybean powder, grain oils, and environmental dust. The gradual accumulation of these contaminants on the lens surface severely attenuates the signal intensity of near-infrared light, introduces background noise, and directly leads to distorted spectral data and inaccurate model predictions, ultimately failing to accurately reflect the degree of mold growth in soybeans.

[0004] Currently, cleaning these contaminants mainly relies on manual, periodic shutdowns for wiping. This method is not only inefficient and disruptive to continuous operations, but also carries significant risks: improper wiping techniques by operators can scratch expensive optical lenses or leave fingerprints and new stains on their surfaces. More importantly, repeated physical contact can gradually loosen the lens mounting structure, degrading its sealing performance.

[0005] Although some high-end equipment attempts to integrate simple blowing systems, their designs are often unidirectional airflow cleaning of the lens surface. Unidirectional airflow can only ensure the cleaning of the trumpet-shaped area, making it difficult to adapt to different models of optical lenses. Furthermore, it easily forces surrounding dust into the assembly gaps between the lens and the lens barrel. This dust accumulated deep in the gaps is extremely difficult to remove, not only becoming a source of secondary pollution, but also easily combining with moisture to exacerbate the corrosion and contamination of internal precision optical components, creating a vicious cycle. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by proposing a near-infrared screening device for soybean mold levels.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a near-infrared screening device for soybean mold degree, comprising a screening body, the screening body including an optical device, a lens at one end of the optical device, a through-hole fixed at one end of the optical device, a through-hole air channel on the inner wall of the through-hole, a four-sided air chamber fixed on the inner surface of the through-hole, a plurality of air outlets on the side of the four-sided air chamber near the lens, the inner wall of the four-sided air chamber is hollow, the inner wall of the four-sided air chamber communicates with the through-hole air channel on the inner wall of the through-hole, an air nozzle fixed at the end of the through-hole air channel away from the four-sided air chamber, an air connecting pipe fixed at one end of the air nozzle, an air distributor fixed at the other end of the air connecting pipe, and an air pump fixed on one side of the air distributor.

[0008] Preferably, one end of the optical device is fixed with a fixing member, both ends of the fixing member are fixed to the corresponding ends of the four-sided air chamber, and an oblique quadrilateral member is fixed on the inner surface of the fixing member, the surface of the oblique quadrilateral member facing the four-sided air chamber is set as an oblique surface.

[0009] Preferably, an octagonal fastener is fixed to the inner surface of the oblique quadrilateral and the inner surface of the through-hole component. The inner circumferential surface of the octagonal fastener has a deformation pre-reserved groove, and a lens piece is pressure-fixed to the inner circumferential surface of the octagonal fastener.

[0010] Preferably, two sealing inclined surfaces are symmetrically distributed and fixed on the inner circumference of the octagonal fastener. The sealing inclined surfaces are circular in shape, corresponding to the inner circumference of the octagonal fastener. The cross-section of the sealing inclined surfaces is inwardly folded, and the outward-facing side of the sealing inclined surfaces is set as an inclined surface.

[0011] Preferably, the inner wall of the sealing inclined surface is provided with a deformation hollow groove, and the deformation hollow groove is circular in shape, which corresponds to the sealing inclined surface.

[0012] Preferably, the sealing bevel has an annular groove at one end near the lens element. The annular groove has an elliptical cross-section, and a sealing gasket is glued to the inner wall of the annular groove. The sealing gasket has an elliptical cross-section and is circular in shape, matching the sealing bevel.

[0013] Preferably, a filling groove is formed on the inner circumferential surface of the octagonal fixing member, both ends of the lens piece, and one side of the sealing inclined member. The filling groove has an approximately triangular cross-section and is filled with sealant.

[0014] Preferably, the opening direction of the vent is towards the lens element.

[0015] In summary, this utility model has the following beneficial effects: 1. This utility model, by setting up an air blowing system consisting of an air pump, an air connecting pipe, four-sided air chambers and multiple air outlets, can automatically and continuously spray airflow onto the surface of the lens film, effectively removing attached soybean powder, oil and dust, avoiding the attenuation of near-infrared signals and the introduction of noise by pollutants, thereby ensuring the authenticity and reliability of spectral data and improving the accuracy and continuity of soybean mold screening. 2. This utility model adopts a multi-seal structure, including a sealing bevel, a sealing gasket, and a filling groove, to form a tight protective barrier around the lens element. This effectively prevents external dust and moisture from entering the assembly gap between the lens and the lens barrel, avoiding secondary pollution and corrosion of internal optical components, and significantly improving the long-term stability and service life of the device. 3. This utility model uses a specific angled air outlet design to guide airflow to more accurately cover the lens surface, ensuring thorough cleaning without dead angles. The oblique four-sided component guides the airflow carrying dust away. At the same time, the octagonal fixing component and deformation pre-reserved groove enhance the compatibility and buffering capacity between components, reducing the risk of lens loosening due to structural stress or frequent cleaning. The overall structure is more stable and the maintenance cost is lower. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the air pump of this utility model; Figure 3 This is a schematic diagram of the gas connecting pipe of this utility model; Figure 4 This is a schematic diagram of the through-hole component of this utility model; Figure 5 This is a schematic diagram of the fixing component of this utility model; Figure 6 This is a schematic diagram of the octagonal fastener of this utility model; Figure 7 This is a cross-sectional view of the air nozzle of this utility model; Figure 8 This is a cross-sectional view of the four sides of the air chamber of this utility model; Figure 9 This is a cross-sectional view of the sealing inclined surface component of this utility model; Figure 10 This is a cross-sectional view of the oblique quadrilateral component of this utility model.

[0017] Figure label: 1. Screening subject; 101. Optical equipment; 102. Lens film; 2. Through-hole component; 201. Four-sided air chamber; 202. Air outlet; 203. Air nozzle; 204. Air connecting pipe; 205. Air distribution component; 206. Air pump; 3. Fixed components; 301. Angled quadrilateral components; 4. Octagonal fastener; 401. Deformation groove; 5. Sealing bevel component; 6. Deformation hollow groove; 7. Sealing gasket; 8. Fill the glue tank. Detailed Implementation

[0018] To make the technical means, creative features, and achieved objectives and effects of this utility model easier to understand, the present utility model is further described below with reference to specific embodiments and accompanying drawings. However, the following embodiments are merely preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described in the implementation plan without creative effort are all within the protection scope of this utility model.

[0019] The specific embodiments of this utility model are described below with reference to the accompanying drawings: Example 1: refer to Figures 1-10 A near-infrared screening device for soybean moldiness includes a screening body 1, which includes an optical device 101. One end of the optical device 101 has a lens 102, and a through-wall 2 is fixed to the other end. The inner wall of the through-wall 2 has a through-air channel. A four-sided air chamber 201 is fixed to the inner surface of the through-wall 2. Multiple air outlets 202 are opened on the side of the four-sided air chamber 201 closest to the lens 102. The inner wall of the four-sided air chamber 201 is hollow and communicates with the through-air channel on the inner wall of the through-wall 2. An air nozzle 203 is fixed to the end of the through-wall 2's air channel away from the four-sided air chamber 201. An air connecting pipe 204 is fixed to one end of the air nozzle 203, and a gas distributor 205 is fixed to the other end of the air connecting pipe 204. An air pump 206 is fixed to one side of the gas distributor 205. The opening direction of the air outlets 202 faces the lens 102.

[0020] Specifically, a complete positive pressure airflow system is formed by the air pump 206, air connecting pipe 204, air passage through the enclosure 2, four-sided air chambers 201 and multiple air outlets 202, which enable the device to automatically and continuously spray directional airflow onto the surface of the lens 102 without interrupting the detection process. The air outlets 202 open towards the lens 102, thereby effectively blowing away dust and grease contaminants attached to the lens, ensuring the purity of the near-infrared light signal and the accuracy of the detection data.

[0021] One end of the optical device 101 is fixed with a fixing member 3. Both ends of the fixing member 3 are fixed to the corresponding ends of the four-sided air chamber 201. An oblique quadrilateral member 301 is fixed on the inner surface of the fixing member 3. The surface of the oblique quadrilateral member 301 facing the four-sided air chamber 201 is set as an oblique surface.

[0022] An octagonal fastener 4 is fixed to the inner surface of the oblique quadrilateral 301 and the inner surface of the through-wall 2. A deformation reserved groove 401 is opened on the inner circumferential surface of the octagonal fastener 4. A lens piece 102 is pressure-fixed to the inner circumferential surface of the octagonal fastener 4.

[0023] Specifically, by setting the fixing component 3 and the oblique quadrilateral component 301 on its inner surface, the airflow carrying dust is guided to smoothly leave the lens area, preventing turbulence or secondary dust adhesion during the cleaning process. At the same time, the lens element 102 is fixed by pressure using the octagonal fixing component 4 and the deformation reserved groove 401 on its inner circumference. This structure enhances the mechanical adaptability and buffering capacity of the fixing component, which can accommodate small dimensional tolerances and effectively absorb external vibrations or stresses, preventing the lens from loosening due to long-term use or environmental factors, and improving the overall structural stability.

[0024] Two sealing inclined surfaces 5 are symmetrically distributed and fixed on the inner circumference of the octagonal fastener 4. The sealing inclined surfaces 5 are circular in shape that matches the inner circumference of the octagonal fastener 4. The cross-section of the sealing inclined surfaces 5 is inwardly folded, and the outward-facing side of the sealing inclined surfaces 5 is set as an inclined surface.

[0025] The inner wall of the sealing inclined surface 5 is provided with a deformation hollow groove 6, which is circular in shape and matches the sealing inclined surface 5.

[0026] The sealing inclined surface 5 has an annular groove at one end near the lens plate 102. The annular groove has an elliptical cross-section. A sealing gasket 7 is glued to the inner wall of the annular groove. The sealing gasket 7 has an elliptical cross-section and is circular in shape, matching the sealing inclined surface 5.

[0027] The inner circumferential surface of the octagonal fastener 4, both ends of the lens plate 102 and one side of the sealing inclined surface 5 are formed with a filling groove 8. The cross-section of the filling groove 8 is approximately triangular, and the filling groove 8 is filled with sealant.

[0028] Specifically, by symmetrically distributing and fixing two sealing inclined surface parts 5 with inwardly buckled cross sections on the inner circumference of the octagonal fastener 4, and opening a deformation hollow groove 6 inside them, the sealing part is given a certain elastic deformation capability.

[0029] Furthermore, an annular groove and an elliptical cross-section sealing gasket 7 are provided at the end of the sealing bevel component 5, and a filling groove 8 is formed at the component joint and filled with sealant, together forming a sealing structure that combines elastic mechanical seal and chemical sealant. This effectively prevents external dust and moisture from entering the interior through the assembly gap between the lens element 102 and the octagonal fixing component 4, preventing contamination and corrosion of the internal precision optical components, and significantly improving the long-term reliability and service life of the device in harsh industrial environments.

[0030] Example 2: refer to Figures 1-10Staff members used the structure disclosed in this utility model in the raw material quality inspection laboratory of a large grain and oil processing enterprise. A batch of soybean raw materials recently transferred from the warehouse needs to undergo rapid screening for moldiness. The company uses the near-infrared screening device for soybean moldiness described in this invention. The screening unit is fixed 300 mm above the conveyor belt by a bracket. The optical equipment is a Bruker MPA type near-infrared spectrometer, with a 25 mm diameter calcium fluoride lens mounted at its front end. The through-body is secured to the front end of the spectrometer with four M5 stainless steel screws. Its internal air passage has a diameter of 6 mm and connects to a four-sided annular air chamber. The four-sided air chamber is made of 6061 aluminum alloy, with 24 evenly distributed 0.8 mm diameter air outlets on its side near the lens. The axis of the air outlets forms a 15-degree angle with the surface of the lens.

[0031] As the conveyor belt carries the soybean sample through the testing area at a speed of 0.5 meters per second, the Omron VG-R361 air pump starts working, generating clean compressed air at 0.4 MPa. The airflow is delivered to the air distribution unit via a polyurethane air connector, then enters the air passage through the nozzle, and finally fills the four-sided air chamber. The airflow ejected from the air outlet forms a uniform air curtain in front of the lens, effectively dispersing the flour-like debris and oil mist stirred up by the soybean sample. The inclined four-sided component inside the fixed enclosure is made of 304 stainless steel, and its 45-degree inclined surface guides the airflow carrying contaminants to the side and downward for discharge, preventing turbulence in the optical path.

[0032] The octagonal fastener is precision-machined, with a 0.5 mm deep internal deformation groove to provide buffer space for the thermal expansion and contraction of the aluminum alloy. The two sealing bevels are made of silicone rubber with 2 mm diameter internal hollow grooves, giving the seals excellent elastic deformation capabilities. The sealing gasket is made of food-grade fluororubber, with an elliptical cross-section of 2 mm major axis and 1.2 mm minor axis, forming a tight seal with the lens edge under 0.3 MPa pressure. Dow Corning 736 high-temperature resistant sealant is injected into the filling groove, which cures at 120 degrees Celsius to form a permanent sealing layer.

[0033] During 8 hours of continuous operation, the device completed 3 spectral acquisitions per second, with a near-infrared wavelength range of 1200-2400 nm and a spectral resolution of 8 cm⁻¹. By establishing a correlation model between the absorbance value at the moisture characteristic absorption peak of 1950 nm and the degree of mold growth, abnormal samples with a mold growth rate exceeding 5% were identified in real time. The device's air blowing system consumes 0.8 cubic meters of air per hour, maintaining the lens transmittance above 95%. Compared to traditional manual wiping methods, the detection accuracy is improved by 23%, and the false alarm rate is reduced to below 0.5%, effectively ensuring the quality and safety of raw materials for the annual production of 300,000 tons of soybeans.

[0034] The working principle of this utility model: Step 1: At the start of production, air pump 206 is activated, serving as the system's power source to generate clean compressed air. The compressed air is distributed via air distributor 205 and delivered to air nozzle 203 fixed on the through-wall 2 via air connector 204. The airflow enters the through-air passage inside the through-wall 2 from the air nozzle 203 and is delivered to the annular four-sided air chamber 201 surrounding the lens element 102.

[0035] Step 2: The compressed air accumulated in the four-sided air chamber 201 is evenly and continuously ejected outward through multiple air outlets 202 opened on the side near the lens element 102. The opening direction of these air outlets 202 is designed to face the surface of the lens element 102, and the ejected airflow forms a dynamic and positive air curtain in front of the sensitive optical area of ​​the lens element 102.

[0036] This air curtain effectively blows away soybean powder, oil droplets, and environmental dust that attempt to adhere to the lens. Even when contaminants accumulate slightly during the inspection process, they are quickly removed, thus preventing the absorption and scattering of near-infrared light by the contaminants and ensuring the intensity and accuracy of the incident and reflected light spectral signals.

[0037] Step 3: The contaminant particles blown off the lens surface mix with the airflow. At this time, the inclined quadrilateral 301 fixed on the fixed enclosure 3 has an inclined surface facing the quadrilateral air chamber 201. This inclined structure can effectively guide the airflow carrying contaminants to diffuse smoothly downward or to the side and rear, instead of forming turbulence in front of the lens or causing secondary dust settling, thus achieving effective contaminant removal.

[0038] Step 4: Two sealing bevel members 5 are symmetrically fixed to the inner circumferential surface of the octagonal fastener 4. Their cross-section is inwardly flared, and they have internally formed deformation hollow grooves 6, giving the sealing bevel members 5 good elasticity. During assembly, utilizing this elastic deformation, the inwardly flared bevel of the sealing bevel member 5 can continuously apply uniform contact pressure to the side of the lens element 102, forming a tight mechanical seal and blocking larger dust particles.

[0039] Step 5: An annular groove is made at the end of each sealing bevel 5, and a sealing gasket 7 is glued and fixed thereon. The sealing gasket 7 has an elliptical cross-section. The elliptical sealing gasket 7 can produce greater contact deformation when under pressure, perfectly filling any microscopic unevenness that may exist between the lens element 102 and the fixing component, forming a sealing layer with better airtightness, and effectively blocking fine dust and moisture.

[0040] Step Six: A filling groove 8 with an approximately triangular cross-section is naturally formed on the inner circumferential surface of the octagonal fixing member 4, the end face of the lens element 102, and one side of the sealing bevel member 5. Sealant is injected and filled into this filling groove 8. The cured sealant forms a seamless sealing structure, ensuring that the sealant does not overflow into the filling groove 8, maintaining the cleanliness of the lens element 102, blocking possible penetration paths, and ensuring the overall sealing integrity of the lens.

[0041] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A near-infrared screening device for soybean mold degree, comprising a screening body (1), the screening body (1) including an optical device (101), one end of the optical device (101) being provided with a lens (102), characterized in that: One end of the optical device (101) is fixed with a through-hole (2). The inner wall of the through-hole (2) is provided with a through-hole air channel. The inner surface of the through-hole (2) is fixed with a four-sided air chamber (201). The side of the four-sided air chamber (201) near the lens (102) is provided with multiple air outlets (202). The inner wall of the four-sided air chamber (201) is hollow. The inner wall of the four-sided air chamber (201) is connected to the through-hole air channel of the inner wall of the through-hole (2). The end of the air channel of the through-hole (2) away from the four-sided air chamber (201) is fixed with an air nozzle (203). One end of the air nozzle (203) is fixed with an air connecting pipe (204). The other end of the air connecting pipe (204) is fixed with an air distribution component (205). An air pump (206) is fixed on one side of the air distribution component (205).

2. The near-infrared screening device for soybean mold degree according to claim 1, characterized in that: One end of the optical device (101) is fixed with a fixing member (3), and both ends of the fixing member (3) are fixed to the two ends of the four-sided air chamber (201). An oblique quadrilateral member (301) is fixed on the inner surface of the fixing member (3), and the surface of the oblique quadrilateral member (301) facing the four-sided air chamber (201) is set as an oblique surface.

3. The near-infrared screening device for soybean mold degree according to claim 2, characterized in that: An octagonal fastener (4) is fixed to the inner surface of the oblique quadrilateral (301) and the inner surface of the through-hole (2). A deformation reserved groove (401) is opened on the inner circumferential surface of the octagonal fastener (4). A lens piece (102) is pressure-fixed on the inner circumferential surface of the octagonal fastener (4).

4. The near-infrared screening device for soybean mold degree according to claim 3, characterized in that: The octagonal fastener (4) has two sealing inclined surfaces (5) symmetrically distributed on its inner circumference. The sealing inclined surfaces (5) are circular in shape that matches the inner circumference of the octagonal fastener (4). The cross-section of the sealing inclined surfaces (5) is inwardly folded. The side of the sealing inclined surfaces (5) facing outward is set as an inclined surface.

5. A near-infrared screening device for soybean mold degree according to claim 4, characterized in that: The inner wall of the sealing inclined surface (5) is provided with a deformation hollow groove (6), which is circular in shape and corresponds to the sealing inclined surface (5).

6. A near-infrared screening device for soybean mold degree according to claim 5, characterized in that: The sealing inclined surface component (5) has an annular groove at one end near the lens plate (102). The annular groove has an elliptical cross section. A sealing gasket (7) is glued to the inner wall of the annular groove. The sealing gasket (7) has an elliptical cross section and is circular in shape, matching the sealing inclined surface component (5).

7. A near-infrared screening device for soybean mold degree according to claim 6, characterized in that: The inner circumferential surface of the octagonal fixing member (4), both ends of the lens piece (102) and one side of the sealing inclined member (5) are formed with a filling groove (8). The cross-section of the filling groove (8) is approximately triangular, and the filling groove (8) is filled with sealant.

8. The near-infrared screening device for soybean mold degree according to claim 1, characterized in that: The opening direction of the vent (202) is toward the lens element (102).

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