Ultraviolet lamp, ultraviolet lamp box and seed cotton fluorescent foreign fiber image acquisition mechanism

Abstract

The utility model discloses an ultraviolet lamp, an ultraviolet lamp box and a seed cotton fluorescent foreign fiber image acquisition mechanism. The ultraviolet lamp comprises an ultraviolet LED lamp and a lamp tube shell, the top of a side plate of the lamp tube shell is connected with a heat dissipation base, the ultraviolet LED lamp is arranged on the inner side wall of the heat dissipation base, and the bottom of the side plate is connected with a light condensation rod; the heat dissipation seat is provided with a heat dissipation cavity and an upper cover plate, the upper cover plate is provided with an air inlet and an air outlet, and the lamp tube shell is provided with an end cover; the purple light lamp box comprises a purple light lamp and a lamp box body, and an end wall lamp tube angle adjusting groove and an end wall lamp tube hinge hole are formed in the end wall of the box body; the image acquisition mechanism comprises a purple light camera, a purple light camera support, a purple light lamp box, ultra-white glass and a middle cotton channel. When the LED lamp works, the light source is cooled and radiated, so that the LED lamp has a good cooling effect; meanwhile, impurity fluorescence can be excited through the emitted purple light, the reflection characteristic difference of the material can be enhanced, the detection precision of specific types of foreign fibers can be improved in the detection process, and dyeing impurities can be accurately recognized.

Description

TECHNICAL FIELD

[0001] The utility model relates to the high -speed image acquisition field such as seed cotton foreign fiber clearance, product classification identification, and is exactly a kind of ultraviolet light, ultraviolet light box and seed cotton fluorescence foreign fiber image acquisition mechanism. BACKGROUND

[0002] In the whole industry chain (picking, transportation, purchase and processing) of cotton, due to the openness of operation environment and the complexity of mechanical operation, chemical fibers, hair, hemp rope, mulching film residues and dyed threads (commonly known as "three filaments") and other foreign fibers (hereinafter referred to as "foreign fibers") are easily mixed into raw cotton. Such foreign impurities have the characteristics of wide source, various forms and similar physical properties to cotton fibers. If they are not effectively removed at the front end of processing, it will lead to serious problems such as increased spinning broken end rate and decreased dyeing uniformity of subsequent textiles. According to the statistics of "China Cotton Textile Industry Quality Report", the color spot defect rate caused by foreign fiber residues accounts for more than 32% of textile quality complaints, and the economic loss of a single batch can reach hundreds of thousands of yuan. Therefore, the rapid detection and efficient removal of foreign fibers in raw cotton are not only the core indicators of quality grade determination, but also directly related to the pricing power and profit space of cotton processing enterprises. The current mainstream seed cotton foreign fiber cleaning equipment generally adopts a composite process of "mechanical separation + optical detection", but its comprehensive removal efficiency can only reach 60%-75%, and the treated cotton still needs to be manually sorted again to meet the requirements of textile.

[0003] The existing image acquisition and foreign fiber identification are mostly in the field of lint processing, such as patent 201220033611.2 foreign fiber detection device, CN201410156376.1 cotton foreign fiber online detection illumination uniformity adjustment method and device. After entering the lint processing, the foreign fibers in the seed cotton are broken, the identification amount is doubled, and the removal difficulty is increased. In the seed cotton foreign fiber removal stage, there are also related patents, such as 201110275391.4 raw cotton foreign fiber detection device and method, 200620008105 secondary camera and double combination light source device of cotton foreign fiber removal machine. The above-mentioned equipment or detection method adopts CCD line array camera and strip light source combination, and removes foreign fibers through PLC control execution unit. However, the existing foreign fiber detection device has the following shortcomings:

[0004] 1. The existing equipment has poor light source cooling effect, which affects the reliability of the equipment.

[0005] 2. The existing device adopts a white light source. Since the white light (400-700nm wide spectrum) relies on the RGB color difference to identify impurities, but dyed threads, chemical fibers and other foreign fibers are often similar in color to cotton fibers (such as beige and light gray), it is difficult for the algorithm to distinguish them. Moreover, the penetration of white light is limited (effective detection depth ≤5mm), and the detection rate of foreign fibers in dense cotton layers is >50%. The detection rate of dyed threads is only 65%-75%, and manual secondary sorting is required.

[0006] Since the ultraviolet light (wavelength range: 365-405nm) can excite the fluorescence effect of some foreign fibers (such as dyed threads, chemical fibers, and plastic films), and cotton fibers do not have significant fluorescence response due to their natural cellulose structure. Moreover, short-wave ultraviolet light (such as 365nm) has a stronger scattering effect than infrared light due to its shorter wavelength, and is more easily blocked by surface fibers. However, it can identify shallowly embedded transparent foreign fibers (such as plastic films) through surface reflection differences. Therefore, in the face of the situation that the white light source cannot meet the demand for high-precision and high-efficiency foreign fiber removal in modern cotton processing, the ultraviolet light source is selected to excite fluorescence and improve the detection capability of dyed threads. Content of the utility model

[0007] The technical problem to be solved by the utility model is to provide an ultraviolet light, an ultraviolet light box and a seed cotton fluorescence foreign fiber image acquisition mechanism. The ultraviolet light, the ultraviolet light box and the seed cotton fluorescence foreign fiber image acquisition mechanism have good cooling effect when working, and can excite impurity fluorescence and enhance the difference in reflection characteristics of materials through the ultraviolet light emitted thereby, which is beneficial to improving the detection accuracy of specific types of foreign fibers and accurately identifying dyed impurities.

[0008] To solve the above technical problems, the utility model adopts the following technical means:

[0009] An ultraviolet light, comprising an ultraviolet LED light and a lamp tube shell, the lamp tube shell is provided with two spaced apart side plates, the top of the side plate is connected with a heat dissipation seat, the inner side wall of the heat dissipation seat is connected with the ultraviolet LED light along the length direction, and the bottom of the side plate is connected with a light collecting rod; the outer side of the heat dissipation seat is provided with a heat dissipation cavity, the heat dissipation cavity is provided with heat dissipation ribs, the top of the heat dissipation cavity is provided with an upper cover plate, the upper cover plate is provided with an air inlet and an air outlet, and cooling air flows into the heat dissipation cavity through the air inlet and flows out through the air outlet; the two ends of the lamp tube shell are provided with end covers, and the end covers close the openings of the two ends of the two side plates and also close the openings of the two ends of the heat dissipation cavity.

[0010] Because the heat generated by the purple light lamp is much larger than that of the white light lamp, the flat heat dissipation at the back of the purple light LED lamp is not enough to cool the purple light lamp, so the heat dissipation seat is designed as a cavity structure, and the heat dissipation ribs are arranged, the arrangement of the heat dissipation cavity can effectively ensure that the air flow is set at the required flow rate to meet the heat dissipation requirement; the heat dissipation ribs effectively increase the contact area with the cooling air flow, so that the heat generated by the purple light LED lamp is better dissipated through heat transfer, thereby improving the cooling speed and better ensuring the stability of the temperature of the purple light lamp.

[0011] The arrangement of the light collecting rod makes the light emitted by the purple light lamp more uniform after passing through the light collecting rod, and the light collecting effect changes the direction of the light, so that the light converges, thereby improving the energy utilization rate and the precision and system stability of impurity detection.

[0012] By arranging the lamp tube shell, it is convenient to connect the light collecting rod and the heat dissipation seat by the side plate, so that the purple light lamp becomes a good heat dissipation purple light source module.

[0013] The top of the side plate is provided with an upper clamping part and a lower clamping part, the upper clamping part is in a stepped shape for clamping the bottom of the heat dissipation seat; the lower clamping part is in an arc shape for clamping the light collecting rod.

[0014] By arranging the upper clamping part and the lower clamping part, the connection of the heat dissipation seat and the light collecting rod is facilitated, and after clamping, the components are further connected and fixed by the stud, thereby effectively improving the stability of the connection.

[0015] The heat dissipation cavity of the heat dissipation seat is provided with a partition plate arranged at intervals, the partition plate separates the heat dissipation cavity into independent heat dissipation zones along the length direction of the heat dissipation cavity, and the upper cover plate is provided with an air inlet and an air outlet at each independent heat dissipation zone.

[0016] By arranging the partition plate, the heat dissipation cavity is separated into independent heat dissipation zones along the length direction, and different heat dissipation zones work independently, which can not only accelerate the air circulation rate and improve the heat dissipation efficiency, but also can ensure that the temperatures of different sections of the whole purple light source are close, reduce the brightness difference caused by uneven temperature of different sections of the light source, prevent the appearance of bright and dark stripes in the cotton flow image caused by uneven temperature of the long strip-shaped purple light lamp, and cause local overexposure or underexposure area to reduce the contrast of foreign fibers, ensure that the light source works in a low-temperature environment, and prolong the service life.

[0017] A kind of purple light lamp box, including purple light, lamp box body, the end wall of the lamp box body is equipped with end wall lamp tube angle adjusting groove, end wall lamp tube hinged hole, end wall lamp tube angle adjusting groove is arranged in the side of end wall lamp tube hinged hole in arc shape, adjusting bolt, adjusting nut are equipped in end wall lamp tube angle adjusting groove, the shank of adjusting bolt is connected with the end of purple light, end wall lamp tube hinged hole is hinged to connect purple light, adjusting bolt is slid along end wall lamp tube angle adjusting groove to adjust the illumination angle of purple light;Two are set apart, end wall lamp tube angle adjusting groove, end wall lamp tube hinged hole are also each set 2 and correspond with the setting of purple light;The light rod of purple light is towards the opening of the front side of lamp box body, the heat dissipation seat of purple light is towards the back side of lamp box body, the back side of lamp box body is also equipped with opening.

[0018] By setting lamp box body, the end wall lamp tube hinged hole of which is hinged to connect purple light, adjusting bolt is slid along end wall lamp tube angle adjusting groove to adjust the illumination angle of purple light, to better meet the needs of image acquisition illumination.

[0019] The back side of the lamp box body is equipped with cooling pipeline, cooling pipeline is equipped with air inlet part, exhaust part, air inlet part and exhaust part are independent of each other, air inlet part is respectively equipped with air inlet total port and air inlet branch, exhaust part is also equipped with exhaust total port and exhaust branch, air inlet on upper cover plate is communicated with air inlet part by air inlet pipe, exhaust port on upper cover plate is communicated with exhaust part by exhaust pipe. Air inlet pipe and exhaust pipe adopt hose.

[0020] By setting cooling pipeline, cooling gas flows into air inlet through air inlet part, after heat absorption by heat transfer when flowing through the cavity part of heat dissipation seat, again flows out of heat dissipation seat from exhaust port, and then flows to exhaust total port from exhaust part.

[0021] The end wall of the box is equipped with end wall pipe hole, and the end wall pipe hole is a long slot hole.

[0022] By setting end wall pipe hole, it is convenient to connect and maintain air inlet and air inlet part, exhaust port and exhaust part by end wall pipe hole after installing purple light and cooling pipeline.

[0023] A seed cotton fluorescent fiber image acquisition mechanism includes a UV camera, a UV camera bracket, a UV light box, ultra-clear glass, and a central cotton channel. The UV camera is positioned on the left and right sides of the mechanism for acquiring images of seed cotton falling in the central cotton channel. The UV camera bracket is used to fix and support the UV camera. Two UV light boxes are provided, one on each side. The UV light boxes are mounted on slide rails, and their spacing is adjusted by sliding along the slide rails. The ultra-clear glass is located on one side of each UV light box. The two UV light boxes are equipped with two ultra-clear glass panes, with the central cotton channel between them. The central cotton channel is located in the center of the entire device. UV lights illuminate the central cotton channel, and the angles of the two UV lights are adjusted so that the intersection of the light rays is located in the center of the central cotton channel. The light box body is mounted on the slide rails, and the position of the light box body is adjusted by the slide rails to effectively improve the brightness of the light intersection point and facilitate focusing. Seed cotton flows through the cotton channel and falls vertically to form a cotton stream, and the UV camera acquires images of the cotton.

[0024] The advantages of this data collection organization also include:

[0025] (1) In order to improve the detection rate of dyed lines, two ultraviolet light sources are set on each side and arranged in a cross manner to compensate for the shadow of the light source. The cross light path can fully cover the surface and side area of ​​the cotton flow, eliminate the shadow dead corner of the single light source, and reduce the false detection rate. The cross light source can also penetrate the cotton layer better. When the high-angle light source penetrates the dense cotton layer (such as the thickness ≥8mm), the detection rate of deep foreign fibers is significantly improved.

[0026] (2) In order to improve the system's adaptability and detection accuracy, and to adapt to the cotton flow of varying thicknesses produced by different production speeds, the four ultraviolet lamps on both sides are set to be adjustable, which can effectively enhance the fluorescence capture capability of foreign fibers. When the two ultraviolet lamps are irradiated at adjustable angles (such as 30° and 60°), they can cover the surface and deep areas of foreign fibers to produce different effects: the low angle (30°) can graze light to excite the fluorescence of surface dye lines and plastic films, and enhance edge contrast; the high angle (60°) can penetrate the cotton layer to excite the fluorescence or reflection differences of deep chemical fiber fragments and metal shavings.

[0027] (3) In order to detect dyed lines more comprehensively, the wavelength of the light source is changed to make more dyed lines produce a fluorescent response. For example, the wavelengths of 365nm violet light and 405nm violet light are complementary, which can excite chemical fibers containing fluorescent whitening agents (such as polyester) to emit blue-white light, and can also target the specific fluorescent response of azo dyed lines.

[0028] (4) The light intensity is adjusted by changing the distance between the light box and the cotton flow via a sliding rail. When the distance is shortened, the light intensity increases according to the inverse square law, which is suitable for penetrating thick cotton layers or detecting low-reflection foreign fibers. Furthermore, shortening the distance can enhance the penetrating power of ultraviolet light, excite fluorescence signals in deep foreign fibers (such as dyed threads embedded in cotton clumps), and increase the detection depth. When the equipment is running at high speed, shortening the distance of the light source and using high-frequency pulses reduces the exposure time and lowers the motion blur rate; when the equipment is running at low speed / intermittently, lengthening the distance and extending the exposure time improves the signal-to-noise ratio of weak signals.

[0029] (5) Two cameras are placed opposite each other to collect multi-view images simultaneously, which improves the detection coverage of foreign fibers, especially the identification rate of impurities hidden at the bottom of the cotton layer.

[0030] Cotton often tumbles or clumps during its descent due to airflow disturbances, causing fiber overlap in the image and increasing the difficulty of identifying foreign fibers. Therefore, the central cotton channel needs to be designed as a cavity-like space with openings at the top and bottom and closed on all four sides. Thus, the camera image acquisition window is sealed on all four sides with ultra-clear glass to prevent airflow disturbances within the device cavity from affecting the cotton. Furthermore, a sufficient height difference is established between the cotton inlet plane and the camera plane to provide enough space for the cotton to fall smoothly from its initial ejection, mitigating the impact of airflow. Attached Figure Description

[0031] Figure 1 This is a perspective view of the ultraviolet lamp of this utility model.

[0032] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure of the ultraviolet lamp in the image.

[0033] Figure 3 for Figure 1 A three-dimensional diagram of the internal structure of the ultraviolet lamp.

[0034] Figure 4 for Figure 1 A three-dimensional view of the side panel.

[0035] Figure 5 for Figure 1 A three-dimensional view of the end cap.

[0036] Figure 6 This is a perspective view of the ultraviolet light box of this utility model.

[0037] Figure 7 This is a top view of the seed cotton fluorescent foreign fiber image acquisition mechanism of this utility model.

[0038] Figure 8 for Figure 7 A schematic diagram of the AA-direction section.

[0039] Figure 9 This is a 3D diagram showing the connection between the intake and exhaust pipes.

[0040] Figure 10 This is a three-dimensional view of the seed cotton fluorescent foreign fiber image acquisition mechanism of this utility model.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1. Ultraviolet (UV) camera;

[0043] 2. Ultraviolet camera bracket;

[0044] 3. UV light box; 301. UV lamp; 302. Light box body; 303. Cooling pipe; 304. Air inlet pipe; 305. Exhaust pipe; 306. Slide rail; 3011. Focusing rod; 3012. UV LED lamp; 3013. Heat sink; 3014. Air inlet; 3015. Exhaust outlet; 3016. Side panel; 3017. Partition; 3018. End cover; 30131. Heat dissipation cavity; 30131. Heat dissipation fins; 30133. Cover plate; 30171. Upper snap-fit ​​part; 30172. Lower snap-fit ​​part; 3021. Box body end wall; 30211. End wall tube hole; 30212. End wall lamp tube angle adjustment groove; 30213. End wall lamp tube hinge hole;

[0045] 4. Ultra-clear glass;

[0046] 5. Middle cotton channel. Detailed Implementation

[0047] The present invention will be further illustrated below with examples.

[0048] See Figures 1-6 As can be seen, the ultraviolet lamp of this utility model, the ultraviolet lamp 301, is composed of ultraviolet LED lamp 3012 and lamp tube housing.

[0049] The lamp tube housing has two spaced-apart side plates 3016. The top of the side plates is connected to a heat sink 3013. A purple LED lamp 3012 is connected to the inner side wall of the heat sink 3013 along the length direction. A focusing rod 3011 is connected to the bottom of the side plates. The outer side of the heat sink 3013 has a heat dissipation cavity 30131. The heat dissipation cavity 30131 has heat dissipation fins 30132. The top of the heat dissipation cavity 30131 has an upper cover plate 30133. The upper cover plate 30133 has an air inlet 3014 and an exhaust port 3015. Cooling airflow flows into the heat dissipation cavity 30131 from the air inlet 3014 and then flows out through the exhaust port 3015. The lamp tube housing has end caps 3018 at both ends. The end caps 3018 close the openings at both ends of the two side plates 3016 and also close the openings at both ends of the heat dissipation cavity 30131.

[0050] Since the heat generated by a UV lamp is much greater than that of a white lamp, the flat heat dissipation on the back of the UV LED lamp 3012 alone is insufficient to cool the UV lamp. Therefore, the heat sink 3013 is designed as a cavity structure and equipped with heat dissipation fins 30132. The heat dissipation cavity 30131 can effectively ensure that the airflow can be set at the required speed to meet the heat dissipation requirements. The heat dissipation fins 30132 effectively increase the contact area with the cooling airflow, so that the heat generated by the UV LED lamp 3012 can be better dissipated through heat transfer, thereby improving the cooling speed and better ensuring the stability of the UV lamp temperature.

[0051] The setting of the focusing rod 3011 makes the light emitted by the ultraviolet lamp 301 more uniform after passing through the focusing rod 3011. The focusing effect also changes the direction of the light, causing the light to converge, thereby improving energy utilization and enhancing the accuracy of impurity detection and system stability.

[0052] By setting up the lamp tube housing, it is convenient to connect and set the focusing rod 3011 and the heat sink 3013 using the side plate 3016, so that the ultraviolet lamp 301 becomes an ultraviolet light source module with good heat dissipation.

[0053] The top of the side plate 3016 is provided with an upper snap-fit ​​part 30171 and a lower snap-fit ​​part 30172. The upper snap-fit ​​part 30171 is stepped and is used to snap the bottom of the heat sink 3013; the lower snap-fit ​​part 30172 is arc-shaped and is used to snap the light-concentrating rod 3011.

[0054] By setting the upper snap-fit ​​part 30171 and the lower snap-fit ​​part 30172, it is convenient to connect the heat sink 3013 and the focusing rod 3011. After snap-fit, the components are further connected and fixed by studs, which effectively improves the stability of the connection.

[0055] The heat dissipation cavity 30131 of the heat dissipation base 3013 is provided with partitions 3017 spaced apart. The partitions 3017 divide the heat dissipation cavity 30131 into independent heat dissipation areas along the length of the heat dissipation cavity 30131. The upper cover 30133 is provided with an air inlet 3014 and an exhaust outlet 3015 in each independent heat dissipation area.

[0056] By setting up partition 3017, the heat dissipation cavity 30131 is divided into independent heat dissipation areas along its length. Different heat dissipation areas work independently, which can not only accelerate the air circulation rate and improve heat dissipation efficiency, but also ensure that the temperature of each section of the entire ultraviolet light source is close, reduce the brightness difference caused by uneven temperature in each section of the light source, and prevent the long strip ultraviolet lamp from causing bright and dark stripes in the cotton flow image due to uneven temperature, and prevent the generation of local overexposed or underexposed areas that reduce the contrast of foreign fibers, thus ensuring that the light source is in a low-temperature working environment and extending its service life.

[0057] See Figure 6It is known that a UV light box includes a UV lamp 301 and a light box body 302. The end wall 3021 of the light box body 302 is provided with an end wall lamp tube angle adjustment groove 30212 and an end wall lamp tube hinge hole 30213. The end wall lamp tube angle adjustment groove 30212 is arc-shaped and located on one side of the end wall lamp tube hinge hole 30213. An adjustment bolt and an adjustment nut are provided at the end wall lamp tube angle adjustment groove 30212. The bolt body of the adjustment bolt is connected to the end of the UV lamp 301, and the end wall lamp tube hinge hole 30213 is hinged. The UV lamp 301 has an adjustable bolt that slides along the end wall lamp tube angle adjustment groove 30212 to adjust the illumination angle of the UV lamp 301; two UV lamps 301 are arranged at intervals, and two end wall lamp tube angle adjustment grooves 30212 and two end wall lamp tube hinge holes 30213 are also arranged accordingly to the UV lamps 301; the focusing rod 3011 of the UV lamp 301 faces the opening on the front side of the lamp box 302, and the heat sink 3013 of the UV lamp 301 faces the rear side of the lamp box 302, and the rear side of the lamp box 302 is also provided with an opening.

[0058] By setting up a light box body 302, the UV lamp 301 is hinged to the lamp tube hinge hole 30213 on its end wall. The illumination angle of the UV lamp 301 is adjusted by sliding the adjusting bolt along the lamp tube angle adjustment groove 30212 on the end wall, thereby better meeting the lighting needs of image acquisition.

[0059] See Figure 1 , Figure 9 It is known that a cooling pipe 303 is provided on the rear side of the light box body 302. The cooling pipe 303 has an air intake section and an air exhaust section, which are independent of each other. The air intake section is provided with a main air intake port and a branch air intake port, and the air exhaust section is also provided with a main exhaust port and a branch exhaust port. The air intake port 3014 on the upper cover plate 30133 is connected to the air intake section through an air intake pipe 304, and the exhaust port 3015 on the upper cover plate 30133 is connected to the exhaust section through an exhaust pipe 305. The air intake pipe 304 and the exhaust pipe 305 are flexible hoses.

[0060] By setting up a cooling pipe 303, cooling gas flows into the air inlet 3014 through the air inlet section, passes through the cavity of the heat sink 3013, absorbs heat through heat transfer, and then flows out of the heat sink through the exhaust port 3015, and then flows to the exhaust port through the exhaust section.

[0061] The end wall 3021 of the box body is provided with an end wall tube hole 30211, which is an elongated slot hole.

[0062] By setting the end wall pipe hole 30211, it is convenient to connect and maintain the pipes of the air inlet 3014 to the air inlet section and the exhaust port 3015 to the exhaust section through the end wall pipe hole 30211 after the ultraviolet lamp 301 and the cooling pipe 303 are installed.

[0063] See Figure 7 , Figure 8 A seed cotton fluorescent fiber image acquisition mechanism includes a UV camera 1, a UV camera bracket 2, a UV light box 3, an ultra-clear glass 4, and a middle cotton channel 5. The UV camera 1 is located on the left and right sides of the mechanism and is used to acquire images of seed cotton falling in the middle cotton channel 5. The UV camera bracket 2 is used to fix and support the UV camera 1. Two UV light boxes 3 are provided, one on each side. The UV light boxes 3 are mounted on a slide rail 306, and the interval of the UV light boxes 3 can be adjusted by sliding along the slide rail. The ultra-clear glass 4 is located on one side of the UV light box 3. Two ultraviolet light boxes 3 are equipped with two ultra-clear glass panels 4, with a central cotton channel 5 between the two ultra-clear glass panels 4. The central cotton channel 5 is located in the center of the entire device. Ultraviolet light lamps 301 illuminate the central cotton channel 5, and the angles of the two ultraviolet light lamps 301 are adjusted so that the intersection of the light rays is located in the center of the central cotton channel 5. The light box body 302 is mounted on a slide rail 306, and the position of the light box body 302 is adjusted by the slide rail 306 to effectively improve the brightness of the intersection of the light rays and facilitate focusing. Seed cotton passes through the cotton channel and falls vertically to form a cotton stream, and the ultraviolet camera 1 captures the cotton image.

[0064] The advantages of this data collection organization also include:

[0065] 1. To improve the detection rate of dyed lines, two ultraviolet light sources are set on each side and arranged in a cross pattern to compensate for the shadow of the light source. The cross light path can fully cover the surface and side area of ​​the cotton flow, eliminate the shadow dead corner of the single light source, and reduce the false detection rate. The cross light source can also penetrate the cotton layer better. When the high-angle light source penetrates the dense cotton layer with a thickness of ≥8mm, the detection rate of deep foreign fibers is significantly improved.

[0066] 2. To improve the system's adaptability and detection accuracy, and to accommodate cotton flows of varying thicknesses produced at different production speeds, the four UV lamps on both sides are made adjustable, effectively enhancing the fluorescence capture capability of foreign fibers. When the dual UV lamps are irradiated at adjustable angles, such as 30° and 60°, different effects can be produced by covering the surface and deeper areas of the foreign fibers: the low angle of 30° can graze light to excite the fluorescence of surface dye lines and plastic films, enhancing edge contrast; the high angle of 60° can penetrate the cotton layer to excite the fluorescence or reflection differences of deep chemical fiber fragments and metal shavings.

[0067] (3) In order to detect dyed lines more comprehensively, the wavelength of the light source is changed to make more dyed lines produce a fluorescent response. For example, the wavelengths of 365nm violet light and 405nm violet light are complementary, which can excite synthetic fibers containing fluorescent whitening agents, such as polyester, to emit blue-white light, and can also target the specific fluorescent response of dyed lines with azo dyes.

[0068] 4. The light intensity is adjusted by changing the distance between the light box and the cotton flow via a sliding rail. When the distance is shortened, the light intensity increases according to the inverse square law, which is suitable for penetrating thick cotton layers or detecting low-reflectance foreign fibers. Furthermore, shortening the distance enhances the penetrating power of ultraviolet light, exciting fluorescence signals in deep foreign fibers such as dyed threads embedded in cotton clumps, thus increasing detection depth. When the equipment is running at high speed, shortening the light source distance and using high-frequency pulses reduces exposure time and lowers motion blur; when the equipment is running at low speed / intermittently, lengthening the distance and extending the exposure time improves the signal-to-noise ratio of weak signals.

[0069] 5. Two cameras are positioned opposite each other to simultaneously acquire multi-view images, improving the coverage of foreign fiber detection, especially effectively improving the recognition rate of impurities hidden at the bottom of the cotton layer.

[0070] Cotton often tumbles or clumps during its descent due to airflow disturbances, causing fiber overlap in the image and increasing the difficulty of identifying foreign fibers. Therefore, the central cotton channel needs to be designed as a cavity-like space with openings at the top and bottom and closed on all four sides. Thus, the camera image acquisition window is sealed on all four sides with ultra-clear glass to prevent airflow disturbances within the device cavity from affecting the cotton. Furthermore, a sufficient height difference is established between the cotton inlet plane and the camera plane to provide enough space for the cotton to fall smoothly from its initial ejection, mitigating the impact of airflow.

[0071] Since the above description is only a specific embodiment of the present utility model, the protection of the present utility model is not limited thereto. Any equivalent changes or substitutions of the technical features of the present technical solution that can be conceived by those skilled in the art are covered within the protection scope of the present utility model.

Claims

1. A UV lamp, wherein the UV lamp (301) comprises a UV LED lamp (3012) and a lamp tube housing, characterized in that: The lamp tube housing has two spaced-apart side plates (3016). The top of the side plates is connected to a heat sink (3013). A purple LED lamp (3012) is connected to the inner side wall of the heat sink (3013) along the length direction. A focusing rod (3011) is connected to the bottom of the side plates. A heat dissipation cavity (30131) is provided on the outer side of the heat sink (30131). Heat dissipation fins (30132) are provided inside the heat dissipation cavity (30131). The top is provided with an upper cover plate (30133), on which an air inlet (3014) and an exhaust port (3015) are provided. Cooling airflow flows into the heat dissipation cavity (30131) from the air inlet (3014) and then flows out through the exhaust port (3015). End caps (3018) are provided at both ends of the lamp tube housing. The end caps (3018) close the openings at both ends of the two side plates (3016) and also close the openings at both ends of the heat dissipation cavity (30131).

2. The ultraviolet lamp according to claim 1, characterized in that: The top of the side plate (3016) is provided with an upper snap-fit ​​part (30171) and a lower snap-fit ​​part (30172). The upper snap-fit ​​part (30171) is stepped and used to snap the bottom of the heat sink (3013); the lower snap-fit ​​part (30172) is arc-shaped and used to snap the light-concentrating rod (3011).

3. The ultraviolet lamp according to claim 1, characterized in that: The heat dissipation cavity (30131) of the heat dissipation base (3013) is provided with partitions (3017) arranged at intervals. The partitions (3017) divide the heat dissipation cavity (30131) into independent heat dissipation areas along the length direction of the heat dissipation cavity (30131). The upper cover plate (30133) is provided with an air inlet (3014) and an exhaust outlet (3015) at each independent heat dissipation area.

4. A UV light box, comprising a UV lamp (301) and a light box body (302), characterized in that: The end wall (3021) of the light box body (302) is provided with an end wall lamp tube angle adjustment groove (30212) and an end wall lamp tube hinge hole (30213). The end wall lamp tube angle adjustment groove (30212) is arc-shaped and located on one side of the end wall lamp tube hinge hole (30213). An adjustment bolt and an adjustment nut are provided at the end wall lamp tube angle adjustment groove (30212). The bolt body of the adjustment bolt is connected to the end of the ultraviolet lamp (301). The end wall lamp tube hinge hole (30213) is hinged to the ultraviolet lamp (301). The end wall lamp tube angle adjustment groove is located along the end wall lamp tube angle adjustment groove. (30212) Slide the adjusting bolt to adjust the illumination angle of the ultraviolet lamp (301); two ultraviolet lamps (301) are provided at intervals, and two end wall lamp tube angle adjustment grooves (30212) and two end wall lamp tube hinge holes (30213) are also provided to correspond to the ultraviolet lamps (301); the focusing rod (3011) of the ultraviolet lamp (301) faces the opening on the front side of the lamp box body (302), the heat sink (3013) of the ultraviolet lamp (301) faces the rear side of the lamp box body (302), and the rear side of the lamp box body (302) is also provided with an opening.

5. The ultraviolet light box according to claim 4, characterized in that: The rear side of the light box body (302) is provided with a cooling pipe (303). The cooling pipe (303) is provided with an air intake section and an air exhaust section. The air intake section is provided with a main air intake port and a branch air intake port. The exhaust section is also provided with a main exhaust port and a branch exhaust port. The air intake port (3014) provided on the upper cover plate (30133) is connected to the air intake section through the branch air intake port. The exhaust port (3015) provided on the upper cover plate (30133) is connected to the exhaust section through the branch exhaust port.

6. The ultraviolet light box according to claim 4, characterized in that: The end wall (3021) of the box body is provided with an end wall tube hole (30211), which is an elongated slot hole.

7. A seed cotton fluorescent foreign fiber image acquisition mechanism, comprising a violet camera (1), a violet camera bracket (2), a violet light box (3), ultra-white glass (4), and an intermediate cotton channel (5), characterized in that: The ultraviolet camera (1) is set on the left and right sides of the mechanism to collect images of the seed cotton falling in the middle cotton channel (5). The UV camera bracket (2) is used to fix and support the UV camera (1); Two ultraviolet light boxes (3) are provided, one on each side; the ultraviolet light boxes (3) are set on the slide rail (306), and the interval of the ultraviolet light boxes (3) is adjusted by sliding along the slide rail; The ultra-white glass (4) is set on one side of the ultraviolet light box (3); two ultraviolet light boxes (3) are equipped with two ultra-white glass (4), and the space between the two ultra-white glass (4) is the middle cotton channel (5); The intermediate cotton path (5) is located in the center of the entire device. The ultraviolet lamp (301) shines on the intermediate cotton path (5), and the angle of the two ultraviolet lamps (301) is adjusted so that the intersection of the light rays is located in the center of the intermediate cotton path (5). The lamp box body (302) is set on the slide rail (306). The position of the lamp box body (302) can be adjusted along the slide rail (306) to effectively improve the brightness of the intersection of the light rays and facilitate focusing. The seed cotton passes through the cotton path and falls vertically to form a cotton flow. The ultraviolet camera (1) collects cotton images.

Images