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

Abstract

The purple light lamp tube comprises a purple light 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 purple light 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 base 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. A purple light lamp box comprises purple light lamp tubes and a lamp box body, and end wall lamp tube angle adjusting grooves and end wall lamp tube hinge holes are formed in the end walls 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 ultraviolet lamp, the ultraviolet lamp box and the seed cotton fluorescent foreign fiber image acquisition mechanism work, a light source is cooled and radiated, and a good cooling effect is achieved; 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 invention relates to the field of high-speed image acquisition such as seed cotton foreign fiber removal and product classification and identification, and more specifically to a purple light lamp, a purple light box and a seed cotton fluorescent foreign fiber image acquisition mechanism. Background Art

[0002] In the entire cotton industry chain (picking, transportation, purchasing and processing), due to the openness of the working environment and the complexity of mechanical operation, raw cotton is very easy to be mixed with chemical fibers, hair, hemp rope, residual film of ground film and dyeing thread (commonly known as "three silks") and other foreign fibers (hereinafter referred to as "foreign fibers"). Such foreign fiber impurities have the characteristics of wide sources, diverse forms, and similar physical properties to cotton fibers. If they are not effectively removed at the front end of processing, it will lead to subsequent textile products. Serious problems such as increased spinning breakage rate and decreased dyeing uniformity. According to the "China Cotton Textile Industry Quality Report", the rate of color spots on the cloth caused by foreign fiber residues accounts for more than 32% of textile quality complaints, and the economic loss of a single batch can reach millions of yuan. Therefore, the rapid detection and efficient removal of foreign fiber content in raw cotton is not only a core indicator for determining quality grade, but is also directly related to the pricing power and profit margins of cotton processing companies. Currently, mainstream seed cotton foreign fiber cleaning equipment in China generally adopts a composite process of "mechanical sorting + optical detection", but its comprehensive removal efficiency can only reach 60%-75%. The processed cotton still needs to rely on manual secondary sorting to meet textile requirements.

[0003] Existing image acquisition and foreign fiber identification are mostly in the field of lint cotton processing, such as patent 201220033611.2 A foreign fiber detection device, and CN201410156376.1 A method and device for adjusting lighting uniformity for online detection of cotton foreign fibers. After entering the lint cotton processing, the foreign fibers in the seed cotton are interrupted, the identification amount increases exponentially, and the difficulty of removal increases. 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 dual combination light source device of cotton foreign fiber removal machine. The above-mentioned equipment or detection methods all use a combination of CCD linear array camera and strip light source, and remove foreign fibers through PLC control execution unit. However, the existing foreign fiber detection devices have the following shortcomings: 1. Most existing devices have poor cooling effect on light sources, which affects the reliability of the equipment.

[0004] 2. Existing equipment uses white light source. Since white light (400-700nm wide spectrum) relies on RGB color difference to identify impurities, but foreign fibers such as dyed threads and chemical fibers are often similar in color to cotton fibers (such as beige and light gray), the algorithm is difficult to distinguish. In addition, the penetration of white light is limited (effective detection depth ≤5mm), and the missed detection rate of foreign fibers deep under the dense cotton layer is greater than 50%. The detection rate of dyed threads is only 65%-75%, requiring manual secondary sorting.

[0005] Since violet light (wavelength range: 365-405nm) can stimulate the fluorescence effect of some foreign fibers (such as dyed lines, chemical fibers, and plastic films), and cotton fibers have no significant fluorescence response due to their natural cellulose structure, and short-wave violet light (such as 365nm) has a shorter wavelength and a stronger scattering effect than infrared light, and is more easily blocked by surface fibers, but can identify shallowly embedded transparent foreign fibers (such as plastic films) through surface reflection differences. Therefore, in the face of the fact that white light sources are difficult to meet the needs of modern cotton processing for high-precision and high-efficiency foreign fiber removal, we choose to add violet light sources to stimulate fluorescence and improve the detection ability of dyed lines. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a violet lamp, a violet light box and a seed cotton fluorescent foreign fiber image collection mechanism; when the violet lamp, the violet light box and the seed cotton fluorescent foreign fiber image collection mechanism are working, the light source is cooled and dissipated, and a good cooling effect is achieved; at the same time, the violet light emitted by them can excite the fluorescence of impurities and enhance the difference in the reflection characteristics of the materials, which is beneficial to improving the detection accuracy of specific types of foreign fibers during detection and accurately identifying dyed impurities.

[0007] In order to solve the above technical problems, the present invention adopts the following technical means: A purple light tube, comprising a purple light LED lamp and a tube housing, wherein the tube housing is provided with two spaced-apart side panels, the top of the side panels being connected to a heat sink, the inner side wall of the heat sink being connected to the purple light LED lamp along the length direction, and the bottom of the side panels being connected to a focusing rod; a heat sink cavity is provided on the outer side of the heat sink, heat sink ribs are provided in the heat sink cavity, an upper cover is provided on the top of the heat sink cavity, an air inlet and an exhaust port are provided on the upper cover, and a cooling airflow flows from the air inlet into the heat sink cavity and then flows out through the exhaust port; end covers are provided at both ends of the tube housing, and the end covers close the openings at both ends of the two side panels and also close the openings at both ends of the heat sink cavity.

[0008] Since the heat generated by the ultraviolet lamp is much greater than that of the white light lamp, the flat heat dissipation on the back of the ultraviolet LED lamp is not enough to cool the ultraviolet lamp. Therefore, the heat sink is designed as a cavity structure and heat dissipation ribs are provided. The setting of the heat dissipation cavity can effectively ensure that the airflow rate is set according to needs to meet the heat dissipation requirements; the heat dissipation ribs effectively increase the contact area with the cooling airflow, so that the heat generated by the ultraviolet LED lamp can be better dissipated through heat transfer, thereby increasing the cooling speed and better ensuring the stability of the temperature of the ultraviolet lamp tube.

[0009] The setting of the focusing rod makes the light emitted by the ultraviolet lamp more uniform after passing through the focusing rod. The focusing effect also changes the direction of the light and converges the light, thereby improving energy utilization and enhancing the accuracy of impurity detection and system stability.

[0010] By arranging the lamp tube housing, it is convenient to connect and arrange the focusing rod and the heat sink by using the side plate, so that the ultraviolet lamp tube becomes an ultraviolet light source module with good heat dissipation.

[0011] An upper clamping part and a lower clamping part are arranged on the top of the side plate. The upper clamping part is in a step shape and is used for clamping the bottom of the heat sink; the lower clamping part is in an arc shape and is used for clamping the focusing rod.

[0012] The upper clamping part and the lower clamping part are provided to facilitate the connection of the heat sink and the focusing rod. After the clamping, the components are further connected and fixed by studs, which effectively improves the stability of the connection.

[0013] The heat dissipation cavity of the heat dissipation seat is provided with partitions arranged at intervals, and the partitions divide the heat dissipation cavity into independent heat dissipation areas along the length direction of the heat dissipation cavity. The upper cover plate is provided with an air inlet and an exhaust port at each independent heat dissipation area.

[0014] By setting partitions, the heat dissipation cavity is divided into independent heat dissipation areas along the length direction. Different heat dissipation areas work independently, which can not only speed up the air circulation rate and improve the heat dissipation efficiency, but also ensure that the temperature of each section of the entire ultraviolet light source is close by segmented cooling, reduce the brightness difference caused by uneven temperature of each section of the light source, and prevent the long strip of ultraviolet light tube from causing light and dark stripes in the cotton flow image due to uneven temperature, resulting in local overexposure or underexposure areas and reducing the contrast of foreign fibers, ensuring that the light source is in a low-temperature working environment and extending its service life.

[0015] A purple light box comprises a purple light tube and a light box body, wherein an end wall of the light box body is provided with an angle adjustment groove for the end wall tube and a hinge hole for the end wall tube, the angle adjustment groove for the end wall tube is arranged in an arc shape on one side of the hinge hole for the end wall tube, an adjusting bolt and an adjusting nut are arranged at the angle adjustment groove for the end wall tube, the bolt body of the adjusting bolt is connected to the end of the purple light tube, the hinge hole for the end wall tube is hingedly connected to the purple light tube, the adjusting bolt is slid along the angle adjustment groove for the end wall tube to adjust the illumination angle of the purple light tube; two purple light tubes are arranged at intervals, and two angle adjustment grooves for the end wall tube and two hinge holes for the end wall tube are also arranged corresponding to the arrangement of the purple light tube; the focusing rod of the purple light tube faces the opening on the front side of the light box body, the heat dissipation seat of the purple light tube faces the rear side of the light box body, and the rear side of the light box body is also provided with an opening.

[0016] By setting up a light box body, the ultraviolet light tube is hingedly connected using its end wall light tube hinge hole, and the adjustment bolt is slid along the end wall light tube angle adjustment groove to adjust the lighting angle of the ultraviolet light tube, thereby better meeting the image acquisition lighting needs.

[0017] The rear side of the light box body is provided with a cooling duct, which is provided with an air intake part and an air exhaust part, which are independent of each other, and the air intake part is provided with an air intake main port and an air intake branch port, and the air exhaust part is also provided with an exhaust main port and an exhaust branch port, the air intake port provided on the upper cover is connected with the air intake part through an air intake pipe, and the exhaust port provided on the upper cover is connected with the exhaust part through an exhaust pipe. The air intake pipe and the exhaust pipe are hoses.

[0018] By setting up a cooling pipeline, the cooling gas flows into the air inlet through the air intake part, flows through the cavity part of the heat sink, absorbs heat through heat transfer, then flows out of the heat sink from the exhaust port, and then flows to the exhaust main port through the exhaust part.

[0019] The end wall of the box body is provided with an end wall tube hole, which is a long strip slot hole.

[0020] By setting the end wall pipe hole, it is convenient to connect and maintain the pipes between the air inlet and the air inlet part, and the exhaust port and the exhaust part through the end wall pipe hole after the ultraviolet light tube and the cooling pipe are installed.

[0021] A mechanism for collecting fluorescent foreign fiber images of seed cotton comprises a purple light camera, a purple light camera bracket, a purple light light box, ultra-white glass, and a middle cotton path, wherein the purple light camera is arranged on the left and right sides of the mechanism for collecting images of seed cotton dropped in the middle cotton path; the purple light camera bracket is used to fix and support the purple light camera; two purple light boxes are arranged, one on each side; the purple light boxes are arranged on a slide rail, and the purple light boxes slide along the slide rail to adjust the interval; the ultra-white glass is arranged on one side of the purple light box; two ultra-white glasses are arranged in two purple light boxes, and the middle cotton path is between the two ultra-white glasses; the middle cotton path is located in the center of the entire device, the purple light tube shines on the middle cotton path, and after adjusting the angles of the two purple light tubes, the intersection point of the light rays is located in the center of the middle cotton path; the light box body is arranged on the slide rail, and the position of the light box body is adjusted by the slide rail, so as to effectively improve the brightness of the intersection point of the light rays and facilitate focusing; the seed cotton passes through the cotton path and falls vertically to form a cotton flow, and the purple light camera collects the cotton image.

[0022] The advantages of this collection agency are: (1) In order to improve the detection rate of dyeing lines, two purple light sources are set on each side and arranged crosswise to compensate for the shadow of the light source. The cross light path can fully cover the surface and side areas of the cotton flow, eliminate the shadow blind spots of a single light source, and reduce the missed detection rate; the cross light source can also better penetrate the cotton layer. When the high-angle light source penetrates the dense cotton layer (such as thickness ≥8mm), the detection rate of deep foreign fibers is significantly improved.

[0023] (2) In order to improve the adaptability and detection accuracy of the system and adapt to the different thicknesses of cotton flows generated by different production speeds, the four ultraviolet lamps on both sides are set to be adjustable, which can effectively enhance the ability to capture the fluorescence of foreign fibers. When the double ultraviolet light is cross-irradiated at an adjustable angle (such as 30° and 60°), it can cover the surface and deep areas of foreign fibers to produce different effects: low angle (30°) can grazing light excite the fluorescence of surface dye lines and plastic films, enhancing edge contrast; high angle (60°) can penetrate the cotton layer to excite the fluorescence or reflection difference of deep chemical fiber fragments and metal chips.

[0024] (3) In order to detect dyeing lines more comprehensively, more dyeing lines can be made to produce fluorescence responses by changing the wavelength of the light source. For example, the wavelengths of 365nm violet light and 405nm violet light are complementary, which can not only stimulate chemical fibers containing fluorescent brighteners (such as polyester) to emit blue-white light, but also produce specific fluorescence responses for azo dye dyeing lines.

[0025] (4) The light intensity can be adjusted by adjusting the distance between the light box and the cotton flow through the slide 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. In addition, shortening the distance can enhance the penetration of ultraviolet light, stimulate the fluorescent signal of deep foreign fibers (such as dyed threads embedded in cotton balls), and increase the detection depth. When the equipment is running at high speed, shorten the light source distance and use high-frequency pulses to reduce exposure time and reduce motion blur rate; when the equipment is running at low speed / intermittently, lengthen the distance and extend the exposure time to improve the signal-to-noise ratio of weak signals.

[0026] (5) Two cameras are placed opposite to each other to synchronously capture multi-view images, which improves the coverage of foreign fiber detection, especially for impurities hidden at the bottom of the cotton layer, which can effectively improve the recognition rate.

[0027] Usually, cotton tends to roll or gather due to air disturbance when falling, resulting in overlapping fibers in the image, which increases the difficulty of identifying foreign fibers. Therefore, the middle cotton channel needs to be set as a cavity-like space with upper and lower openings and closed on all sides. Therefore, the window for camera image acquisition is closed on four sides with ultra-white glass to prevent the air disturbance in the cavity of the device from affecting the cotton. A sufficient height difference is set between the cotton feed inlet plane and the camera plane so that there is enough space for the cotton to be thrown out and fall steadily to alleviate the impact of airflow. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional diagram of the ultraviolet light tube of the present invention.

[0029] Figure 2 for Figure 1 Schematic diagram of the structural cross-section of the ultraviolet lamp.

[0030] Figure 3 for Figure 1A three-dimensional diagram of the internal structure of the ultraviolet lamp.

[0031] Figure 4 for Figure 1 A three-dimensional view of the side panel of the vehicle.

[0032] Figure 5 for Figure 1 A three-dimensional view of the end cap in FIG.

[0033] Figure 6 It is a three-dimensional diagram of the ultraviolet light box of the present invention.

[0034] Figure 7 It is a top view of the seed cotton fluorescent foreign fiber image acquisition mechanism of the present invention.

[0035] Figure 8 for Figure 7 AA section diagram of .

[0036] Fig. 9 This is a three-dimensional diagram of the connection between the intake pipe and the exhaust pipe.

[0037] Fig.10 It is a stereoscopic diagram of the seed cotton fluorescent foreign fiber image acquisition mechanism of the present invention.

[0038] Description of reference numerals: 1. Purple light camera; 2. Purple light camera bracket; 3. Ultraviolet light box; 301. Ultraviolet light tube; 302. Light box body; 303. Cooling pipe; 304. Air inlet; 305. Exhaust pipe; 306. Slide rail; 3011. Focusing rod; 3012. Ultraviolet LED lamp; 3013. Heat sink; 3014. Air inlet; 3015. Exhaust port; 3016. Side plate; 3017. Partition plate; 3018. End cover; 30131. Heat dissipation cavity; 30131. Heat dissipation ribs; 30133. Cover plate; 30171. Upper clamping part; 30172. Lower clamping part; 3021. Box end wall; 30211. End wall tube hole; 30212. End wall lamp tube angle adjustment slot; 30213. End wall lamp tube hinge hole; 4. Ultra-clear glass; 5. Cotton path in the middle. DETAILED DESCRIPTION

[0039] The present invention is further described below with reference to examples.

[0040] See also Figure 1-Figure 6 It can be known that the purple light tube 301 of the present invention is composed of a purple light LED lamp 3012 and a tube shell.

[0041] The lamp tube shell is provided with two side panels 3016 arranged at intervals, the top of the side panels is connected to the heat sink 3013, the inner wall of the heat sink 3013 is connected to the purple LED lamp 3012 along the length direction, and the bottom of the side panels is connected to the focusing rod 3011; a heat sink 30131 is provided on the outer side of the heat sink 3013, heat sink ribs 30132 are provided in the heat sink 30131, and an upper cover plate 30133 is provided on the top of the heat sink 30131, and an air inlet 3014 and an exhaust port 3015 are provided on the upper cover plate 30133, and the cooling airflow flows into the heat sink 30131 from the air inlet 3014 and then flows out through the exhaust port 3015; end covers 3018 are provided at both ends of the lamp tube shell, and the end covers 3018 close the openings at both ends of the two side panels 3016 and also close the openings at both ends of the heat sink 30131.

[0042] Since the heat generated by the purple light is much greater than that of the white light, the flat heat dissipation on the back of the purple LED lamp 3012 is not enough to cool the purple light. Therefore, the heat sink 3013 is designed as a cavity structure, and heat dissipation ribs 30132 are provided. The setting of the heat dissipation cavity 30131 can effectively ensure that the airflow rate is set according to needs to meet the heat dissipation requirements; the heat dissipation ribs 30132 effectively increase the contact area with the cooling airflow, so that the heat generated by the purple LED lamp 3012 can be better dissipated through heat transfer, thereby increasing the cooling speed and better ensuring the stability of the temperature of the purple lamp tube.

[0043] The setting of the focusing rod 3011 makes the light emitted by the ultraviolet lamp tube 301 more uniform after passing through the focusing rod 3011. The focusing effect also changes the direction of the light and converges the light, thereby improving energy utilization, and enhancing the accuracy of impurity detection and system stability.

[0044] 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 tube 301 becomes a ultraviolet light source module with good heat dissipation.

[0045] The top of the side plate 3016 is provided with an upper clamping portion 30171 and a lower clamping portion 30172 . The upper clamping portion 30171 is in a step shape and is used to clamp the bottom of the heat sink 3013 ; the lower clamping portion 30172 is in an arc shape and is used to clamp the focusing rod 3011 .

[0046] By providing the upper clamping part 30171 and the lower clamping part 30172, the connection between the heat sink 3013 and the focusing rod 3011 is facilitated. After the clamping, the components are further connected and fixed by studs, which effectively improves the stability of the connection.

[0047] The heat dissipation cavity 30131 of the heat dissipation seat 3013 is provided with spaced partitions 3017, and the partitions 3017 divide the heat dissipation cavity 30131 into independent heat dissipation zones along the length direction of the heat dissipation cavity 30131. The upper cover 30133 is provided with an air inlet 3014 and an exhaust port 3015 at each independent heat dissipation zone.

[0048] By setting the partition 3017, the heat dissipation cavity 30131 is divided into independent heat dissipation zones along the length direction. Different heat dissipation zones work independently, which can not only speed up the air circulation rate and improve the heat dissipation efficiency, but also ensure that the temperatures of each section of the entire ultraviolet light source are close by segmented cooling, reduce the brightness difference caused by uneven temperature of each section of the light source, and prevent the long strip of ultraviolet light tube from causing light and dark stripes in the cotton flow image due to uneven temperature, resulting in local overexposure or underexposure areas and reducing the contrast of foreign fibers, thereby ensuring that the light source is in a low-temperature working environment and extending its service life.

[0049] See also Figure 6 It can be seen that a purple light box includes a purple light tube 301 and a light box body 302. The end wall 3021 of the light box body 302 is provided with an end wall light tube angle adjustment groove 30212 and an end wall light tube hinge hole 30213. The end wall light tube angle adjustment groove 30212 is arranged in an arc shape on one side of the end wall light tube hinge hole 30213. An adjusting bolt and an adjusting nut are arranged at the end wall light tube angle adjustment groove 30212. The bolt body of the adjusting bolt is connected to the end of the purple light tube 301. The end wall light tube hinge hole 30213 is hingedly connected to the purple light tube The lamp tube 301 is adjusted by sliding the adjusting bolt along the angle adjustment groove 30212 of the lamp tube on the end wall to adjust the illumination angle of the ultraviolet lamp tube 301; two ultraviolet lamp tubes 301 are arranged at intervals, and the angle adjustment groove 30212 of the lamp tube on the end wall and the hinge holes 30213 of the lamp tube on the end wall are also arranged with two each corresponding to the arrangement of the ultraviolet lamp tube 301; the focusing rod 3011 of the ultraviolet lamp tube 301 faces the opening on the front side of the light box body 302, and the heat sink 3013 of the ultraviolet lamp tube 301 faces the rear side of the light box body 302, and the rear side of the light box body 302 is also provided with an opening.

[0050] By setting up a light box body 302, the ultraviolet light tube 301 is hingedly connected using its end wall lamp tube hinge hole 30213, and the adjustment bolt is slid along the end wall lamp tube angle adjustment groove 30212 to adjust the lighting angle of the ultraviolet light tube 301, thereby better meeting the image acquisition lighting needs.

[0051] See also Figure 1 , Fig. 9It can be seen that the rear side of the light box body 302 is provided with a cooling duct 303, and the cooling duct 303 is provided with an air intake part and an air exhaust part, and the air intake part and the air exhaust part are independent of each other, and the air intake part is provided with an air intake main port and an air intake branch port, and the air exhaust part is also provided with an exhaust main port and an exhaust branch port, and the air intake port 3014 provided on the upper cover plate 30133 is connected with the air intake part through the air intake pipe 304, and the exhaust port 3015 provided on the upper cover plate 30133 is connected with the exhaust part through the exhaust pipe 305. The air intake pipe 304 and the exhaust pipe 305 are hoses.

[0052] By setting up the cooling pipe 303, the cooling gas flows into the air inlet 3014 through the air inlet part, flows through the cavity part of the heat sink 3013, absorbs heat through heat transfer, then flows out of the heat sink from the exhaust port 3015, and then flows to the exhaust main port through the exhaust part.

[0053] The box end wall 3021 is provided with an end wall tube hole 30211, which is a long strip-shaped slot hole.

[0054] By setting the end wall tube hole 30211, it is convenient to connect and maintain the pipes between the air inlet 3014 and the air inlet part, and the exhaust port 3015 and the exhaust part through the end wall tube hole 30211 after the ultraviolet light tube 301 and the cooling pipe 303 are installed.

[0055] See also Figure 7 , Figure 8 A seed cotton fluorescent foreign fiber image acquisition mechanism, comprising a purple light camera 1, a purple light camera bracket 2, a purple light light box 3, ultra-white glass 4, and a middle cotton path 5, wherein the purple light camera 1 is arranged on the left and right sides of the mechanism, and is used to acquire images of seed cotton dropped in the middle cotton path 5; the purple light camera bracket 2 is used to fix and support the purple light camera 1; two purple light boxes 3 are arranged, one on each side; the purple light box 3 is arranged on a slide rail 306, and the purple light box 3 slides along the slide rail to adjust the interval; the ultra-white glass 4 is arranged on one side of the purple light box 3; Two ultra-white glasses 4 are provided in two ultra-white light boxes 3, and a middle cotton path 5 is provided between the two ultra-white glasses 4; the middle cotton path 5 is located in the center of the entire device, and the ultraviolet lamp tube 301 shines on the middle cotton path 5, and after adjusting the angles of the two ultra-white lamp tubes 301, the intersection point of the light rays is located in the center of the middle cotton path 5; the light box body 302 is provided on a slide rail 306, and the position of the light box body 302 is adjusted by the slide rail 306, so as to effectively improve the brightness of the intersection point of the light rays and facilitate focusing; the seed cotton passes through the cotton path and falls vertically to form a cotton flow, and the ultraviolet camera 1 collects cotton images.

[0056] The advantages of this collection agency are: 1 In order to improve the detection rate of dyeing lines, two purple light sources are set on each side and arranged crosswise to compensate for the shadow of the light source. The cross light path can fully cover the cotton flow surface and side areas, eliminate the shadow blind spots of a single light source, and reduce the missed detection rate; the cross light source can also better penetrate the cotton layer. 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.

[0057] 2 In order to improve the adaptability and detection accuracy of the system and adapt to the different thickness of cotton flow generated by different production speeds, the 4 ultraviolet lamps on both sides are set to be adjustable, which can effectively enhance the ability to capture the fluorescence of foreign fibers. When the double ultraviolet light is cross-irradiated at adjustable angles such as 30° and 60°, it can cover the surface and deep areas of foreign fibers to produce different effects: the low angle of 30° can grazing light excite the fluorescence of surface dyeing lines and plastic films, and enhance the edge contrast; the high angle of 60° can penetrate the cotton layer to excite the fluorescence or reflection difference of deep chemical fiber fragments and metal chips.

[0058] (3) In order to detect dyeing lines more comprehensively, more dyeing lines can be made to produce fluorescence responses by changing the wavelength of the light source. For example, the wavelengths of 365nm violet light and 405nm violet light are complementary, which can not only stimulate chemical fibers containing fluorescent brighteners such as polyester to emit blue-white light, but also produce specific fluorescence responses for azo dye dyeing lines.

[0059] 4. The light intensity can be adjusted by adjusting the distance between the light box and the cotton flow through the slide 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-reflective foreign fibers. In addition, shortening the distance can enhance the penetration of ultraviolet light, stimulate the fluorescent signal of deep foreign fibers such as dyed threads embedded in cotton balls, and increase the detection depth. When the equipment is running at high speed, shorten the light source distance and use high-frequency pulses to reduce exposure time and reduce motion blur rate; when the equipment is running at low speed / intermittently, lengthen the distance and extend the exposure time to improve the signal-to-noise ratio of weak signals.

[0060] 5 Two cameras are placed opposite to each other to collect multi-view images synchronously, which can improve the coverage of foreign fiber detection, especially for impurities hidden at the bottom of the cotton layer, which can effectively improve the recognition rate.

[0061] Usually, cotton tends to roll or gather due to air disturbance when falling, resulting in overlapping fibers in the image, which increases the difficulty of identifying foreign fibers. Therefore, the middle cotton channel needs to be set as a cavity-like space with upper and lower openings and closed on all sides. Therefore, the window for camera image acquisition is closed on four sides with ultra-white glass to prevent the air disturbance in the cavity of the device from affecting the cotton. A sufficient height difference is set between the cotton feed inlet plane and the camera plane so that there is enough space for the cotton to be thrown out and fall steadily to alleviate the impact of airflow.

[0062] Since the above description is only a specific implementation mode of the present invention, the protection of the present invention is not limited thereto, any equivalent changes or substitutions of the technical features of the technical solution that can be thought of by technicians in this technical field are covered within the protection scope of the present invention.

Claims

1. A purple light tube, the purple light tube (301) comprising a purple light LED lamp (3012) and a tube housing, characterized in that: The lamp tube housing is provided with two side panels (3016) arranged at intervals; the top of the side panels is connected to the heat sink (3013); the inner wall of the heat sink (3013) is connected to a purple LED lamp (3012) along the length direction; and the bottom of the side panels is connected to a focusing rod (3011); a heat sink cavity (30131) is provided on the outside of the heat sink (3013); a heat sink rib (30132) is provided in the heat sink cavity (30131); An upper cover plate (30133) is provided on the top, and an air inlet (3014) and an air outlet (3015) are provided on the upper cover plate (30133); a cooling airflow flows from the air inlet (3014) into the heat dissipation cavity (30131) and then flows out through the air outlet (3015); end covers (3018) are provided at both ends of the lamp tube housing, and the end covers (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 light tube according to claim 1, characterized in that: An upper clamping portion (30171) and a lower clamping portion (30172) are provided at the top of the side plate (3016); the upper clamping portion (30171) is in a step shape and is used for clamping the bottom of the heat sink (3013); and the lower clamping portion (30172) is in an arc shape and is used for clamping the focusing rod (3011).

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

4. A purple light box, comprising a purple light tube (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 arranged in an arc shape 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 tube (301); the end wall lamp tube hinge hole (30213) is hingedly connected to the ultraviolet lamp tube (301); and the end wall lamp tube angle adjustment groove (30212) is provided with an adjustment bolt and an adjustment nut. The purple light tube (301) is provided with two sliding adjustment bolts (30212) to adjust the illumination angle of the purple light tube (301); two purple light tubes (301) are arranged at intervals, and the end wall lamp tube angle adjustment grooves (30212) and the end wall lamp tube hinge holes (30213) are also arranged two each corresponding to the purple light tube (301); the focusing rod (3011) of the purple light tube (301) faces the opening on the front side of the light box body (302), and the heat sink (3013) of the purple light tube (301) faces the rear side of the light box body (302), and the rear side of the light box body (302) is also provided with an opening.

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

6. The ultraviolet light box according to claim 4, characterized in that: The box body end wall (3021) is provided with an end wall tube hole (30211), and the end wall tube hole (30211) is a long strip-shaped slot hole.

7. A seed cotton fluorescent foreign fiber image acquisition mechanism, comprising a purple light camera (1), a purple light camera bracket (2), a purple light light box (3), ultra-white glass (4), and a middle cotton path (5), characterized in that: The purple light camera (1) is arranged on the left and right sides of the mechanism and is used to collect images of seed cotton dropped in the middle cotton path (5); The purple light camera bracket (2) is used to fix and support the purple light camera (1); Two ultraviolet light boxes (3) are provided, one on each side of the left and right sides; the ultraviolet light boxes (3) are arranged on a slide rail (306), and the ultraviolet light boxes (3) slide along the slide rail to adjust the interval; The ultra-white glass (4) is arranged on one side of the ultra-white light box (3); two ultra-white glass (4) are arranged on two ultra-white light boxes (3), and a middle cotton channel (5) is provided between the two ultra-white glass (4); The middle cotton path (5) is located in the center of the entire device; the ultraviolet light tube (301) illuminates the middle cotton path (5); and after adjusting the angles of the two ultraviolet light tubes (301), the intersection of the light rays is located in the center of the middle cotton path (5); the light box body (302) is arranged on a slide rail (306); the position of the light box body (302) can be adjusted along the slide rail (306), thereby effectively improving the brightness of the intersection of the light rays and facilitating focusing; the seed cotton passes through the cotton path and falls vertically to form a cotton flow, and the ultraviolet light camera (1) collects cotton images.

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