A rapid sample preparation device for fiber samples based on multispectral imaging detection

Abstract

This invention belongs to the field of textile fiber testing technology, and particularly relates to a rapid fiber sample preparation device based on multispectral imaging detection. Addressing the problem that mechanical combing in existing fiber sample preparation devices causes irreversible damage to the fiber surface, making it difficult to meet high-throughput detection requirements, the following solution is proposed: a conveying component, an airflow combing component, a cutting blade, a sample drop tube, a sample box, and a detection turntable assembly. The airflow combing component simulates the action of comb teeth to perform non-destructive combing of the fibers; the cutting blade has air outlet grooves aligned with the bevel of the blade edge, enabling immediate cutting, blowing, and dropping; the sample drop tube is equipped with an ion wind ring and multiple sets of angled gradient air inlets opened along the tangential direction of the tube wall to eliminate static electricity, pneumatically disperse, and guide multi-stage airflow in the fiber segments. Combined with the detection turntable assembly, this achieves parallel, streamlined operation of sample preparation and detection, and can be widely used for non-destructive, high-throughput pretreatment and multispectral imaging detection of precious fibers such as cashmere and wool.

Description

Technical Field

[0001] This invention relates to a fiber sample preparation device, specifically a rapid fiber sample preparation device based on multispectral imaging detection, belonging to the field of textile fiber detection technology. Background Technology

[0002] In recent years, with the rapid development of the textile industry and fiber testing field, increasingly higher demands have been placed on the efficiency and standardization of fiber sample pretreatment. Against the backdrop of the increasing prevalence of advanced analytical technologies such as multispectral imaging detection, the technological lag in sample preparation has become a major bottleneck restricting testing efficiency and result accuracy. Currently, sample preparation devices used for fiber testing mainly suffer from the following technical deficiencies: Firstly, fibers are prone to entanglement and aggregation during sample preparation, leading to overlapping shadows and obscuring features during multispectral imaging. This severely affects the repeatability and accuracy of spectral information acquisition. Traditional manual sample preparation or simple vibration dispersion methods cannot solve this problem. They often require repeated adjustments based on the operator's experience, which is not only inefficient but also results vary from person to person, lacking objectivity and repeatability. Secondly, most existing sample preparation equipment processes samples one by one at a single station. From fiber dispersion, arrangement, cutting to sample laying, multiple sample transfers are required. There is a lack of effective connection between each step, resulting in a long sample preparation cycle and high labor intensity, which makes it difficult to meet the needs of customs, quality inspection agencies and other occasions for rapid screening of large batches of fiber samples. Third, existing fiber sample preparation devices mostly use mechanical combs or rollers and other contact mechanisms for combing and dispersing fibers. Although these mechanisms can achieve a certain degree of combing, they will cause irreversible damage to the surface scales and cuticle of precious fibers such as cashmere, which will directly affect the accuracy of subsequent multispectral imaging in identifying fiber surface features (such as scale morphology, coating, dye aging layer, etc.).

[0003] To address the aforementioned issues, existing technology (publication number: CN103614833A) discloses a method and equipment for dispersing and forming continuous functional fiber bundles by airflow. This method uses a high-speed airflow expander to continuously blow and spray long fiber bundles, separating each single yarn into a monofilament state. This method has a good effect on dispersing continuous fiber bundles, but the single airflow dispersion method it uses lacks orderly control over the fiber direction. Furthermore, this equipment is mainly used for processing continuous fiber bundles and cannot be applied to the preparation of short fiber samples after cutting. Another example is (publication number: CN120764890A), which discloses a standard cotton sample preparation device and method. Its main purpose is to straighten the fiber sample by airflow. This device has improved the fiber orientation, but it still uses mechanical combing to pre-treat the fibers, which cannot avoid mechanical contact damage to the fiber surface characteristics. Moreover, this device is a single-station design with low sample preparation efficiency, making it difficult to achieve high-throughput assembly line operation. Summary of the Invention

[0004] This invention provides a rapid fiber sample preparation device based on multispectral imaging detection to address the problem that mechanical combing in existing fiber sample preparation devices causes irreversible damage to the fiber surface, making it difficult to meet the requirements of high-throughput detection.

[0005] The present invention achieves the above objectives through the following technical solution: a rapid sample preparation device for fiber samples based on multispectral imaging detection, comprising a conveying component for placing the fiber to be prepared, a cutting blade and a multispectral imager, an airflow combing component above the conveying component, a sample drop tube directly below the part of the conveying component connected to the cutting blade, a sample box at the bottom of the sample drop tube, and an ion wind ring and multiple sets of air inlet units opened along the tangential direction of the tube wall inside the sample drop tube. The conveying assembly includes a conveying frame, a microporous conveyor belt rotatably connected inside the conveying frame, the microporous conveyor belt having multiple fiber conveying paths, a combing plate located above the microporous conveyor belt connecting the two long side frames of the conveying frame, the microporous conveyor belt having a negative pressure unit for fixing the fiber to be processed, and a combing air guide cavity opened in the combing plate. The airflow combing assembly includes a fixed outer tube and a rotating inner tube that are movably connected. The bottom of the fixed outer tube is provided with an opening groove, and the body of the rotating inner tube is provided with multiple row-shaped air holes. The direction of the airflow sprayed by the row-shaped air holes in the opening groove area changes from vertical to inclined relative to the fiber to be processed. The blade of the cutting blade has an air vent groove, and the air vent groove is aligned with the bevel of the cutting blade.

[0006] As a further embodiment of the present invention: multiple channel partitions are connected above the frame of the conveyor frame, and a fiber conveying path is formed between two adjacent channel partitions. The negative pressure unit includes a tail negative pressure box and a front negative pressure box respectively disposed on both sides of the combing plate. Both the tail negative pressure box and the front negative pressure box are fixedly connected to the long side frame of the conveyor frame, and both the tail negative pressure box and the front negative pressure box are attached to the lower surface of the upper belt of the microporous conveyor belt. A pressure block is placed on the upper belt of the microporous conveyor belt located between two adjacent channel partitions. The placement area of ​​the pressure block is located directly above the tail negative pressure box. The pressure block is a movable pressure block independent of the microporous conveyor belt. The pressure block can be detachably fixed to the surface of the upper belt of the microporous conveyor belt by negative pressure adsorption and can move synchronously with the microporous conveyor belt. The tail end of the fiber to be sampled is clamped between the pressure block and the belt of the microporous conveyor belt. A rubber pressure strip is connected to the bottom surface of the pressure block, which can be fixed by negative pressure adsorption with the belt of the microporous conveyor belt.

[0007] As a further embodiment of the present invention: a conveying drive roller, a conveying driven roller, and a guide roller are rotatably connected between the two long side frames of the conveying frame. The conveying drive roller and the conveying driven roller are respectively set at both ends of the inner belt of the microporous conveyor belt. The guide roller is set at the bending part of the belt of the microporous conveyor belt. A conveying motor is fixedly connected to the outer wall of one long side frame of the conveying frame. The motor shaft of the conveying motor is fixedly connected to the conveying drive roller on the same axis. Rubber baffles are connected to the two short side frames of the conveying frame, and the rubber baffles are placed on the bending parts at both ends of the upper belt of the microporous conveyor belt.

[0008] As a further embodiment of the present invention: the combing plate and the upper belt of the microporous conveyor belt located on both sides are arranged on the same plane. The upper surface of the combing plate is provided with a number of air guide holes that are connected to the combing air guide cavity. The opening positions of the air guide holes are respectively located in the fiber conveying path area formed between two adjacent channel partitions. The channel angle of the air guide holes gradually changes from vertical to inclined along the conveying direction of the fiber to be prepared. The channel angle of the air guide holes corresponds to the direction of the airflow sprayed by the row of air holes in the opening groove area. The tail negative pressure box, the front negative pressure box and the combing air guide cavity are independently connected to the external negative pressure extraction equipment.

[0009] As a further embodiment of the present invention: a rotating motor is fixedly connected to one end of the fixed outer tube, the motor shaft of the rotating motor is fixedly connected to the rotating inner tube along the same axis, a rotary sealing joint is rotatably connected to the other end of the fixed outer tube, and the rotating inner tube is connected to an external high-pressure air pump through the rotary sealing joint. Support plates are fixedly connected between the two ends of the fixed outer tube and the two side long frame bodies of the conveying frame. The row of air holes opened on the body of the rotating inner tube is distributed in a ring at equal intervals, and the opening positions of the air holes of adjacent rows of air holes are staggered.

[0010] As a further embodiment of the present invention: a blade holder, a connecting plate, and a pressure plate are provided on the side of the cutting blade near the conveying frame. The blade holder is fixedly connected to two adjacent channel partitions. The connecting plate is connected to the upper end of the cutting blade. The pressure plate is movably disposed at the lower end of the cutting blade. Both the connecting plate and the pressure plate are located on the side of the cutting blade near the channel partition. The pressure plate can be movably locked between two adjacent channel partitions. Two vertically arranged limiting rods are connected to the body of the pressure plate. The rods of the limiting rods movably pass through the connecting plate. A limiting top block is fixedly connected to the top of the limiting rods. A spring is movably sleeved on the rod of the limiting rod located below the connecting plate. A pneumatic push rod is fixedly connected to the top of the blade holder. The telescopic rod of the pneumatic push rod is fixedly connected to the connecting plate.

[0011] As a further embodiment of the present invention: a venting duct is fixedly connected to the lower surface of the connecting plate, and a folded airbag is fixedly connected to the upper surface of the pressure plate. The venting duct is connected to the folded airbag. A venting chamber is provided inside the blade of the cutting blade. A one-way venting interface is connected between the venting duct and the venting chamber. The venting duct is also connected to a one-way air inlet interface. A protrusion is connected to the part where the blade edge of the cutting blade meets the blade body. An air outlet groove is provided inside the protrusion and is connected to the venting chamber. Both the one-way venting interface and the one-way air inlet interface are interfaces with built-in one-way valves.

[0012] As a further embodiment of the present invention: a notch and slot are provided at the upper end of the sample drop tube, the part of the conveying component that connects to the cutting blade is placed in the notch and slot, an ion wind ring is embedded in the inner wall of the sample drop tube, an ion wind ring is fixedly connected in the cavity of the ion wind ring, the ion wind ring is electrically connected to an external high voltage line, and a number of flow equalization microholes are provided on the inner side of the ion wind ring.

[0013] As a further embodiment of the present invention: the sample drop tube is configured from top to bottom as a vertical tube section, a constricted tube section, and an expanded tube section. The vertical tube section of the sample drop tube has a first air inlet chamber, the constricted tube section has a second air inlet chamber, and the expanded tube section has a third air inlet chamber. The air inlet unit includes a first tangential air inlet hole, a second tangential air inlet hole, and a third tangential air inlet hole sequentially opened on the inner walls of the vertical tube section, the constricted tube section, and the expanded tube section of the sample drop tube. The first tangential air inlet hole and the ion wind ring are both connected to the first air inlet chamber, the second tangential air inlet hole is connected to the second air inlet chamber, and the third tangential air inlet hole is connected to the third air inlet chamber. The opening direction of the first tangential air inlet hole is inclined upward at 60° along the tangent of the tube wall, the opening direction of the second tangential air inlet hole is inclined upward at 30° along the tangent of the tube wall, and the opening direction of the third tangential air inlet hole is parallel to the tangent of the tube wall.

[0014] As a further embodiment of the present invention: a detection turntable assembly is further provided below the sample drop tube. The detection turntable assembly includes a rotating base and a circular limiting box. The rotating base is rotatably connected to the circular limiting box. Multiple sets of slots are formed on the upper surface of the rotating base, each set corresponding to a sample drop tube. The sample box is movably placed within the slot. A background plate located below the rotating base is also provided inside the circular limiting box. A locking ring is fixedly connected to the outer periphery of the background plate, and the locking ring rotatably engages with the inner wall of the circular limiting box. The box wall has a manual adjustment groove, and part of the locking ring is exposed in the manual adjustment groove. The bottom of the circular limiting box is fixedly connected to a turntable motor. The motor shaft of the turntable motor is fixedly connected to the rotating base along the same axis. A multispectral imager is installed above the rotating base. An imager fixing bracket is connected between the multispectral imager and the circular limiting box. The rotating base is driven by the turntable motor to drive any two sets of box slots to be respectively set below the sample drop tube and the multispectral imager. Support legs are fixedly connected to the bottom of both the circular limiting box and the conveying frame.

[0015] The beneficial effects of this invention are: 1. This invention comprises a conveying assembly for placing the fiber sample, a cutting blade, and a multispectral imager. An airflow combing assembly is positioned above the conveying assembly. A sample drop tube is located directly below the part of the conveying assembly connected to the cutting blade. A sample box is located at the bottom of the sample drop tube. The sample drop tube contains an ion ring and multiple sets of air inlets tangentially aligned to the tube wall. This constitutes a continuous, automated sample preparation line from fiber conveying, contour combing, fixed-length cutting to orderly sample drop. The airflow combing assembly utilizes a gas jet to simulate the mechanical combing action of comb teeth, avoiding the scratching damage to the scales and keratin layer of cashmere fibers caused by traditional mechanical comb teeth. This is particularly suitable for high-value cashmere fibers. The non-destructive pretreatment process is achieved; the cutting blade can cut the fibers to a fixed length after they have been fully combed and dispersed into individual strands. The cut short fiber segments fall directly into the sample collection tube below, eliminating the need for manual transfer or long-distance pneumatic conveying, thus greatly reducing the secondary entanglement and scattering loss of short fibers during the transfer process; the sample collection tube is equipped with an ion wind ring and a tangential air inlet unit, which can eliminate static electricity, pneumatically disperse and guide the fiber segments during the material collection process, so that they fall evenly into the sample box; the entire process realizes closed-loop automation of combing, cutting, material collection and detection, which significantly reduces the uncertainty caused by manual intervention and improves sample preparation efficiency and repeatability; 2. The conveying assembly of this invention includes a conveying frame, within which a microporous conveyor belt is rotatably connected. The microporous conveyor belt has multiple fiber conveying paths. A combing plate located above the microporous conveyor belt is connected between the two long side frames of the conveying frame. The microporous conveyor belt is equipped with a negative pressure unit for fixing the fibers to be prepared. A combing air guide cavity is opened in the combing plate. The multiple fiber conveying paths enable the device to process multiple fiber bundles simultaneously, significantly improving the sample preparation efficiency per unit time. The negative pressure unit adsorbs the fiber bundles onto the belt surface through the micropores on the microporous conveyor belt, preventing the fibers from sliding or shifting during the conveying process. When the fibers are combed and dispersed on the combing plate, the airflow blown down by the airflow combing assembly is promptly drawn away through the air guide holes, preventing the airflow from blowing randomly on the surface of the combing plate and causing the fibers to scatter. At the same time, the suction effect can further press the fibers onto the microporous conveyor belt, enhancing the fixing effect, so that the fibers can achieve high dispersion and directional arrangement before entering the cutting blade, reducing the adhesion of fiber segments after cutting. 3. The airflow combing assembly of this invention includes a fixed outer tube and a rotating inner tube that are movably sleeved together. The bottom of the fixed outer tube has an opening groove, and the rotating inner tube has multiple rows of air holes. The direction of the airflow sprayed from these air holes in the opening groove area changes from vertical to inclined relative to the fiber sample. When the rotating inner tube rotates inside the fixed outer tube, the air holes sequentially pass through the opening groove area. The airflow from each air hole at the opening groove first impacts the fiber bundle vertically downwards, dispersing the surface layer of the fiber bundle. Then, as the rotating inner tube continues to rotate, the direction of the airflow changes... Gradually changing to an inclined direction, it generates a transverse shearing force on the fibers, separating the adhered fibers from the bundle. Due to the row-shaped and rotating air pores, multiple airflows form a sweeping action similar to comb teeth on the fiber surface, but without any mechanical contact. The airflow combing component can change the combing frequency and speed by controlling the rotation speed of the inner tube, which has strong adaptability. As the airflow direction changes from vertical to inclined, the inclined airflow can lift the fibers upward and then re-adsorb them by the negative pressure unit, realizing multiple cycles of lifting, separating, and positioning, thereby completely breaking up the bundled fibers. 4. The cutting blade of this invention has an air outlet groove on its blade body. The air outlet direction of the air outlet groove is aligned with the beveled edge of the cutting blade. The airflow from the air outlet groove forms an air film on the beveled edge, blowing the just-cut fiber segments away from the blade and preventing short fibers from sticking to the blade due to static electricity or adhesion, thereby avoiding tangled fibers or uneven cuts during subsequent cutting. Secondly, the airflow blows downward along the beveled edge, applying a downward thrust to the ends of the cut fiber bundles, allowing them to fall smoothly into the sample tube without curling or rebounding. It can also promptly blow away the tiny fiber debris generated during the cutting process, preventing debris accumulation from affecting the cutting accuracy. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the conveying component structure of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the pressing block of the present invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the conveyor frame of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of the combing plate of the present invention; Figure 6 This is a schematic diagram of the connection structure between the conveyor frame and the microporous conveyor belt of the present invention; Figure 7 This is a schematic diagram of the microporous conveyor belt structure of the present invention; Figure 8 This is a schematic diagram of the airflow comb-like component structure of the present invention; Figure 9 This is a schematic cross-sectional view of the connection between the fixed outer tube and the rotating inner tube of the present invention. Figure 10 For the present invention Figure 9 Schematic diagram of the structure at point B; Figure 11 This is a front view cross-sectional structural diagram of the airflow comb-like component of the present invention; Figure 12 For the present invention Figure 2 Schematic diagram of the structure at point A in the middle; Figure 13 This is a schematic diagram of the disassembled structure of the cutting blade and pressure plate of the present invention; Figure 14 This is a schematic diagram of the connection structure between the cutting blade and the pressure plate of the present invention; Figure 15 This is a schematic diagram of the cross-sectional structure of the cutting blade of the present invention; Figure 16 This is a schematic diagram of the cross-sectional structure of the sample drop tube of the present invention; Figure 17 This is a partial structural diagram of the ion wind ring of the present invention; Figure 18 This is a schematic diagram of the disassembled structure of the detection turntable assembly and sample box of the present invention; Figure 19 This is a schematic diagram of the cross-sectional structure of the detection turntable assembly of the present invention; Figure 20 This is a schematic diagram of the connection structure between the rotating chassis and the locking ring of the present invention.

[0017] In the diagram: 1. Conveyor frame; 11. Microporous conveyor belt; 12. Combing plate; 13. Channel partition; 14. Pressure block; 15. Conveyor motor; 16. Rubber pressure strip; 17. Rubber baffle; 18. Tail negative pressure box; 19. Front negative pressure box; 110. Combing air guide chamber; 111. Air guide hole; 112. Conveyor drive roller; 113. Conveyor driven roller; 115. Guide roller; 2. Airflow combing assembly; 21. Fixed outer tube; 22. Rotating motor; 23. Support plate; 24. Rotating inner tube; 25. Row-shaped air holes; 26. Opening groove; 27. Rotary sealing joint; 3. Cutting blade; 31. Blade holder; 32. Pneumatic push rod; 33. Connecting plate; 34. Protruding strip; 35. Pressure plate; 36. Limiting linkage; 37. Spring; 38. Folding airbag 39. Ventilation duct; 310. One-way air inlet; 311. Limiting top block; 312. Ventilation chamber; 313. One-way air inlet; 314. Air outlet groove; 4. Sample drop tube; 41. Notch slot; 42. First air inlet chamber; 43. Second air inlet chamber; 44. Third air inlet chamber; 45. Ionizing air ring; 46. First tangential air inlet; 47. Second tangential air inlet; 48. Third tangential air inlet; 49. Flow equalization micropore; 410. Ionizing wire mesh; 5. Detection turntable assembly; 51. Rotating base; 52. Circular limiting box; 53. Box slot; 54. Manual adjustment slot; 55. Background base plate; 56. Turntable motor; 57. Positioning rotating ring; 6. Multispectral imager; 61. Imager fixing bracket; 7. Sample box; 8. Support leg. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1 like Figures 1 to 20As shown, a rapid fiber sample preparation device based on multispectral imaging detection includes a conveying component for placing the fiber to be prepared, a cutting blade 3, and a multispectral imager 6. An airflow combing component 2 is located above the conveying component. A sample drop tube 4 is located directly below the part of the conveying component connected to the cutting blade 3. A sample box 7 is located at the bottom of the sample drop tube 4. The sample drop tube 4 contains an ion ring 45 and multiple sets of air inlets tangentially opened along the tube wall, forming a continuous automated sample preparation line from fiber conveying, contour combing, fixed-length cutting to orderly sample drop. The airflow combing component 2 uses a gas jet to simulate the mechanical combing action of comb teeth, avoiding the scratching damage to the scales and keratin layer of cashmere fibers caused by traditional mechanical comb teeth. This method is particularly suitable for the non-destructive pretreatment of high-value cashmere fibers. The cutting blade 3 can cut the fibers to a fixed length after they have been fully combed and dispersed into single strands. The cut short fiber segments fall directly into the sample drop tube 4 below, eliminating the need for manual transfer or long-distance pneumatic conveying, thus greatly reducing the secondary entanglement and scattering loss of short fibers during the transfer process. The sample drop tube 4 is equipped with an ion wind ring 45 and a tangential air inlet unit, which can eliminate static electricity, pneumatically disperse and guide the fiber segments during the dropping process, so that they fall evenly into the sample box 7. The entire process realizes closed-loop automation of combing, cutting, dropping, collection and detection, which significantly reduces the uncertainty caused by manual intervention and improves sample preparation efficiency and repeatability. The conveying assembly includes a conveying frame 1, within which a microporous conveyor belt 11 is rotatably connected. The microporous conveyor belt 11 has multiple fiber conveying paths. A combing plate 12, located above the microporous conveyor belt 11, is connected between the two long side frames of the conveying frame 1. The microporous conveyor belt 11 is equipped with a negative pressure unit for fixing the fibers to be prepared. A combing air guide chamber 110 is formed within the combing plate 12. The multiple fiber conveying paths allow the device to process multiple bundles of fibers simultaneously, significantly improving the sample preparation efficiency per unit time. The negative pressure unit... The micropores on the microporous conveyor belt 11 adsorb the fiber bundles onto the belt surface, preventing the fibers from sliding or shifting during the conveying process. When the fibers are combed and dispersed on the combing plate 12, the airflow blown down by the airflow combing component 2 is promptly removed through the air guide hole 111, preventing the airflow from blowing randomly on the surface of the combing plate 12 and causing the fibers to scatter. At the same time, the suction effect can further press the fibers onto the microporous conveyor belt 11, enhancing the fixing effect, so that the fibers can achieve high dispersion and directional arrangement before entering the cutting blade 3, reducing the adhesion of fiber segments after cutting. The airflow combing assembly 2 includes a fixed outer tube 21 and a rotating inner tube 24 that are movably sleeved together. The bottom of the fixed outer tube 21 has an opening groove 26, and the rotating inner tube 24 has multiple rows of air holes 25. The direction of the airflow sprayed from the rows of air holes 25 in the area of ​​the opening groove 26 changes from vertical to inclined relative to the fiber sample. When the rotating inner tube 24 rotates inside the fixed outer tube 21, the rows of air holes 25 pass through the area of ​​the opening groove 26 in sequence. The airflow from each air hole at the opening groove 26 first impacts the fiber bundle vertically downwards, dispersing the surface layer of the fiber bundle. Then, as the rotating inner tube 24 continues to rotate... As the airflow direction gradually changes to an inclined direction, it generates a transverse shearing force on the fibers, separating the adhered fibers from the bundle. Due to the row-shaped and rotating air pores, multiple airflows form a comb-like sweeping action on the fiber surface, but without any mechanical contact. The airflow combing component 2 can change the combing frequency and speed by controlling the rotation speed of the inner tube 24, which has strong adaptability. During the process of the airflow direction changing from vertical to inclined, the inclined airflow can lift the fibers upward and then re-adsorb them by the negative pressure unit, realizing multiple cycles of lifting, separating, and positioning, thereby completely breaking up the bundled fibers. The blade of the cutting blade 3 has an air outlet groove 314. The air outlet direction of the air outlet groove 314 is aligned with the bevel of the cutting edge of the cutting blade 3. The airflow from the air outlet groove 314 forms an air film at the bevel of the cutting edge, which blows the fiber segment that has just been cut off from the cutting edge, preventing short fibers from sticking to the cutting edge due to static electricity or adhesion, thereby avoiding tangled fibers or uneven cuts during subsequent cutting. Secondly, the airflow blows downward along the bevel of the cutting edge, applying a downward thrust to the end of the fiber bundle being cut, so that it falls smoothly into the sample tube 4 without curling or rebounding, and can promptly blow away the tiny fiber debris generated during the cutting process, preventing debris accumulation from affecting the cutting accuracy.

[0020] Example 2 Improvements based on Example 1: like Figures 1 to 7As shown, multiple channel partitions 13 are connected above the frame of the conveyor frame 1, forming a fiber conveying path between two adjacent channel partitions 13. The negative pressure unit includes a tail negative pressure box 18 and a front negative pressure box 19 disposed on both sides of the combing plate 12. Both the tail negative pressure box 18 and the front negative pressure box 19 are fixedly connected to the long side frames of the conveyor frame 1, and both the tail negative pressure box 18 and the front negative pressure box 19 are attached to the lower surface of the upper layer of the microporous conveyor belt 11. A pressure block 14 is placed on the upper layer of the microporous conveyor belt 11 between two adjacent channel partitions 13. The placement area of ​​the pressure block 14 is located in the tail negative pressure box. Directly above 18, the pressure block 14 is a movable pressure block independent of the microporous conveyor belt 11. The pressure block 14 is detachably fixed to the upper surface of the microporous conveyor belt 11 by negative pressure adsorption and can move synchronously with the microporous conveyor belt 11. The tail end of the fiber to be processed is clamped between the pressure block 14 and the microporous conveyor belt 11. The bottom surface of the pressure block 14 is connected to a rubber pressure strip 16 that can be fixed to the microporous conveyor belt 11 by negative pressure adsorption. Multiple channel partitions 13 enable the device to process multiple fiber bundles simultaneously without interference. The tail negative pressure box 18 is responsible for adsorbing the tail end of the fiber bundle, and the front negative pressure box 19 is responsible for adsorbing the fiber. The fiber is held close to the head of the cutting blade 3, allowing it to be sucked in through the micropores of the microporous conveyor belt 11. A rubber strip 16, which can be attached to the bottom of the pressure block 14 and fixed with the negative pressure of the microporous conveyor belt 11, physically presses the fiber tail end, forming a double fixation. The two work together to ensure that the fiber does not shift or fall off when subjected to the impact of the airflow combing assembly 2 and the cutting force of the cutting blade 3. Furthermore, the suction force of the front negative pressure box 19 ensures that the fiber body remains straight and taut. The rubber strip 16 can firmly clamp the fiber without damaging it, ensuring reliable fixation while also allowing for control of the front... The negative pressure switching of the end negative pressure box 19 and the tail negative pressure box 18 allows the fibers to be gradually released during the conveying process, thereby realizing the step-by-step feeding of the fiber bundle. It should be noted that the pressure block 14 is manually placed on the upper belt of the microporous conveyor belt 11 away from the airflow combing component 2 before each sample preparation. That is, during the sample preparation process, due to the negative pressure adsorption, the pressure block 14 can be adsorbed and fixed on the belt of the microporous conveyor belt 11 and can move synchronously with the conveying of the microporous conveyor belt 11, thereby fixing the clamped fibers and ensuring that the fibers can be fed with the conveying of the microporous conveyor belt 11.

[0021] Furthermore, a conveying drive roller 112, a conveying driven roller 113, and a guide roller 115 are rotatably connected between the two long side frames of the conveyor frame 1. The conveying drive roller 112 and the conveying driven roller 113 are respectively located at both ends of the inner belt of the micro-perforated conveyor belt 11, and the guide roller 115 is located at the bending part of the belt of the micro-perforated conveyor belt 11. A conveyor motor 15 is fixedly connected to the outer wall of one long side frame of the conveyor frame 1. The motor shaft of the conveyor motor 15 is fixedly connected to the conveying drive roller 112 along the same axis. Rubber baffles 17 are connected to the two short side frames of the conveyor frame 1, and the rubber baffles 17 are placed on the bending parts at both ends of the upper belt of the micro-perforated conveyor belt 11. 5. A servo motor or stepper motor is used to control the rotation angle and speed of the conveyor drive roller 112, thereby driving the fiber bundle forward a precise distance, i.e., the length of each cut, through the micro-perforated conveyor belt 11. The guide roller 115 ensures a smooth transition at the bends of the micro-perforated conveyor belt 11, preventing wrinkles or deviation of the belt surface. The rubber baffle 17 is placed at both ends of the bends of the upper layer of the micro-perforated conveyor belt 11, effectively sealing the gap formed between the belt surface and the short frame of the conveyor frame 1, preventing fiber debris from entering the interior of the conveyor frame 1. In addition, the rubber baffle 17 can also scrape off residual fibers or dust adhering to the belt surface during the movement of the belt, playing a self-cleaning role.

[0022] Furthermore, the combing plate 12 and the upper belt of the microporous conveyor belt 11 located on both sides are arranged on the same plane. The upper surface of the combing plate 12 is provided with several air guide holes 111 that communicate with the combing air guide chamber 110. The air guide holes 111 are located in the fiber conveying path area formed between two adjacent channel partitions 13. The channel angle of the air guide holes 111 gradually changes from vertical to inclined along the conveying direction of the fiber to be processed. The channel angle of the air guide holes 111 corresponds to the direction of the airflow sprayed by the row of air holes 25 in the area of ​​the opening groove 26. The tail negative pressure box 18, the front negative pressure box 19 and the combing air guide chamber 110 are independently connected to the external negative pressure extraction equipment. When the airflow combing assembly 2 blows high-speed airflow from above to comb the fiber bundle, the airflow blown onto the surface of the combing plate 12 will be immediately drawn away by the air guide holes 111, thereby avoiding the airflow blowing randomly on the plate and causing the fiber to scatter or become entangled again. Furthermore, the suction effect creates a local low-pressure zone near the fiber, which helps to further adsorb and fix the fiber downward, enhancing the stability of the fiber during the combing process. This allows the jet of the airflow combing component 2 to penetrate the fiber bundle more effectively without blowing it away. The tail negative pressure box 18, the front negative pressure box 19, and the combing air guide chamber 110 are independently connected to the external negative pressure extraction equipment, allowing the device to flexibly adjust the negative pressure intensity of each area according to the process stage: when the fiber just enters the combing area, the combing air guide chamber 110 uses a medium negative pressure to extract the turbulent flow; when the fiber is strongly swept by the airflow combing component 2, the combing air guide chamber 110 increases the negative pressure to quickly expel the airflow; when the fiber needs to be conveyed forward, the tail negative pressure box 18, the front negative pressure box 19, and the combing air guide chamber 110 close the negative pressure suction. This can optimize the pressure parameters of each area for different fiber characteristics, such as the softness of cashmere and the coarseness of wool, thereby achieving the best combing effect.

[0023] like Figure 1 , Figures 8 to 11As shown, a rotating motor 22 is fixedly connected to one end of the fixed outer tube 21. The motor shaft of the rotating motor 22 is fixedly connected to the rotating inner tube 24 along the same axis. A rotary sealing joint 27 is rotatably connected to the other end of the fixed outer tube 21, and the rotating inner tube 24 is connected to an external high-pressure air pump through the rotary sealing joint 27. Support plates 23 are fixedly connected between the two ends of the fixed outer tube 21 and the two long side frames of the conveying frame 1. The row of air holes 25 opened on the body of the rotating inner tube 24 is distributed in a ring at equal intervals, and the opening positions of the air holes of adjacent rows of air holes 25 are staggered. Because the row of air holes 25 is distributed in a ring at equal intervals on the circumference and adjacent rows are staggered, the rotating inner tube 24 rotates for each revolution. At different angles, air holes at different positions pass through the opening groove 26 area, thus creating a moving array of air holes at the opening groove 26 of the fixed outer tube 21, simulating the action of comb teeth sweeping across the fiber surface; the staggered air holes make the airflow more uniform; and the combing frequency can be adjusted by changing the rotation speed of the rotating motor 22. At low speed, each fiber is repeatedly blown more times, which is suitable for heavily entangled fibers; at high speed, the blowing frequency is high, which is suitable for rapid pre-dispersion. In addition, during the rotation of the rotating inner tube 24, the air holes that do not enter the opening groove 26 area are sealed by the tube wall of the fixed outer tube 21, so there is no waste of air source and the energy utilization rate is high.

[0024] like Figure 1 , Figure 2 , Figures 12 to 15As shown, a blade holder 31, a connecting plate 33, and a pressure plate 35 are provided on the side of the cutting blade 3 near the conveying frame 1. The blade holder 31 is fixedly connected to two adjacent channel partitions 13. The connecting plate 33 is connected to the upper end of the cutting blade 3. The pressure plate 35 is movably disposed at the lower end of the cutting blade 3. Both the connecting plate 33 and the pressure plate 35 are located on the side of the cutting blade 3 near the channel partition 13. The pressure plate 35 can be movably locked between two adjacent channel partitions 13. Two vertically arranged limiting rods 36 are connected to the body of the pressure plate 35. The rods of the limiting rods 36 movably pass through the connecting plate 33. A limiting top block 311 is fixedly connected to the top of the limiting rods 36. A spring 37 is movably fitted onto the rod 36 located below the connecting plate 33. A pneumatic push rod 32 is fixedly connected to the top of the blade holder 31. The telescopic rod of the pneumatic push rod 32 is fixedly connected to the connecting plate 33. The pneumatic push rod 32 pushes the connecting plate 33 down. The connecting plate 33 first drives the pressure plate 35 down via the spring 37. The pressure plate 35 first contacts the fiber bundle and presses it firmly against the edge of the conveyor frame 1. As the connecting plate 33 continues to descend, the spring 37 is compressed, and the pressure gradually increases, ensuring that the fiber is firmly pressed down. Then the cutting blade 3 continues to descend to complete the cutting. After the cutting is completed, the pneumatic push rod 32 rises, the spring 37 releases the pressure, the pressure plate 35 lifts first, and then the cutting blade 3 lifts again. This design avoids fiber slippage during cutting and fiber adhesion after cutting, ensuring that the length of each cut fiber segment is consistent. It also avoids incomplete cutting or tangling problems caused by fiber slippage, making it particularly suitable for cutting extremely fine and smooth cashmere fibers.

[0025] Furthermore, a ventilation duct 39 is fixedly connected to the lower surface of the connecting plate 33, and a folded airbag 38 is fixedly connected to the upper surface of the pressure plate 35. The ventilation duct 39 is connected to the folded airbag 38. A ventilation chamber 312 is provided inside the blade of the cutting blade 3. A one-way ventilation port 313 is connected between the ventilation duct 39 and the ventilation chamber 312. The ventilation duct 39 is also connected to a one-way air inlet port 310. A protrusion 34 is connected to the part where the blade edge of the cutting blade 3 meets the blade body. An air outlet groove 314 is provided inside the protrusion 34 and is connected to the ventilation chamber 312. Both the one-way ventilation port 313 and the one-way air inlet port 310 are interfaces with built-in one-way valves. The action of the pressure plate 35 is combined with the air blowing function of the cutting blade 3. When the pneumatic push rod 3 When the connecting plate 33 is pushed down, the folded airbag 38 is compressed, and the internal gas enters the ventilation chamber 312 of the cutting blade 3 through the ventilation duct 39 and the one-way ventilation port 313, and then is ejected from the air outlet 314, providing air blowing at the moment the blade cuts the fiber. When the connecting plate 33 rises, the pressure plate 35 is pulled down by its own weight and the elastic extension of the spring 37, which stretches and expands the folded airbag 38. The folded airbag 38 draws in air from the outside through the one-way air inlet port 310 to prepare for the next cut, realizing the cutting and blowing linkage. Since both the one-way ventilation port 313 and the one-way air inlet port 310 are interfaces with built-in one-way valves, it is ensured that the gas can only flow from the folded airbag 38 to the ventilation chamber 312 and cannot flow in the opposite direction.

[0026] like Figure 1 , Figure 16 and Figure 17 As shown, the upper end of the sample drop tube 4 is provided with a notch and slot 41. The part of the conveying component that connects to the cutting blade 3 is placed in the notch and slot 41. An ion air ring 45 is embedded in the inner wall of the sample drop tube 4. An annular ionization mesh 410 is fixedly connected in the cavity of the ion air ring 45. The ionization mesh 410 is electrically connected to an external high-voltage line. Several flow equalization microholes 49 are provided on the inner side of the ion air ring 45. The high-voltage line applies a high voltage to the ionization mesh 410, causing the ionization mesh 410 to generate corona discharge in the ion air ring 45, ionizing the air to generate positive and negative ions. Under the action of the electric field and airflow, these ions diffuse evenly into the internal space of the sample drop tube 4 through the flow equalization microholes 49, come into contact with the falling fiber segments, and neutralize the static electricity generated by friction on the fiber surface. This can eliminate static electricity in the fiber segments at the inlet of the sample drop tube 4, solving the static electricity problem at the source. At the same time, the airflow introduced into the ion air ring 45 also plays a role in assisting the conveying of fiber segments and preventing them from accumulating at the tube opening.

[0027] Furthermore, the sample drop tube 4 is configured from top to bottom as a vertical tube section, a converging tube section, and an expanding tube section. The vertical tube section of the sample drop tube 4 has a first air inlet chamber 42, the converging tube section has a second air inlet chamber 43, and the expanding tube section has a third air inlet chamber 44. The air inlet unit includes a first tangential air inlet hole 46, a second tangential air inlet hole 47, and a third tangential air inlet hole sequentially formed on the inner walls of the vertical tube section, the converging tube section, and the expanding tube section of the sample drop tube 4. 48. The first tangential air inlet 46 and the ion wind ring 45 are both connected to the first air inlet chamber 42. The second tangential air inlet 47 is connected to the second air inlet chamber 43. The third tangential air inlet 48 is connected to the third air inlet chamber 44. The opening direction of the first tangential air inlet 46 is inclined upward at 60° along the tangent of the pipe wall. The opening direction of the second tangential air inlet 47 is inclined upward at 30° along the tangent of the pipe wall. The opening direction of the third tangential air inlet 48 is parallel to the tangent of the pipe wall. The opening direction of each air inlet is... The angle gradient design enables multi-stage pneumatic control of the fiber segments. The first tangential air inlet 46 sprays air at a 60° upward angle, generating an upward vortex at the top of the sample drop tube 4. This slows down the falling speed of the fiber segments, extending their residence time in the tube. Simultaneously, the centrifugal force of the vortex throws the fiber segments against the tube wall, facilitating dispersion. The second tangential air inlet 47 sprays air at a 30° upward angle, further enhancing the vortex intensity and causing the fiber segments to begin transitioning downwards. The third tangential air inlet 48 sprays air in a direction parallel to the tangent of the tube wall, forming a strong vortex in the expansion section. This generates a downward centrifugal force, throwing the fiber segments against the tube wall and accelerating their descent along a spiral trajectory before they are uniformly ejected from the tube opening. The three different inclination angles gradually transform the airflow's force on the fiber segments from lifting to pushing, preventing premature landing or prolonged suspension of the fiber segments that might occur with a unidirectional airflow. This achieves dynamic control of the fiber segments during the dropping process, allowing for adaptive adjustment of the pressure in each air inlet chamber based on the mass and length of the fiber segments, thereby optimizing the uniformity of the dropping distribution.

[0028] like Figure 1 , Figure 18 , Figure 19 and Figure 20As shown, a detection turntable assembly 5 is also provided below the sample drop tube 4. The detection turntable assembly 5 includes a rotating base 51 and a circular limiting box 52. The rotating base 51 is rotatably connected to the circular limiting box 52. The upper surface of the rotating base 51 has multiple sets of box slots 53, each set of box slots 53 corresponding to the sample drop tube 4. The sample box 7 is movably placed in the box slot 53. A background base plate 55 located below the rotating base 51 is also provided inside the circular limiting box 52. A locking ring 57 is fixedly connected to the outer periphery of the background base plate 55. The locking ring 57 is rotatably locked onto the inner wall of the circular limiting box 52. A manual adjustment groove 54 is provided on the wall of the circular limiting box 52. Part of the ring of the locking ring 57 is exposed in the manual adjustment groove 54. A turntable motor 56 is fixedly connected to the bottom of the circular limiting box 52. The motor shaft of the turntable motor 56 is fixedly connected to the rotating base 51 along the same axis. A turntable motor 56 is provided above the rotating base 51. A multispectral imager 6 is installed, and an imager fixing bracket 61 connects the multispectral imager 6 to the circular limiting box 52. The rotating base 51 is driven by the turntable motor 56 to drive any two sets of box slots 53 to be respectively set below the sample drop tube 4 and the multispectral imager 6. Support legs 8 are fixedly connected to the bottom of the circular limiting box 52 and the conveying frame 1. The background plate 55 can be manually rotated to switch different background materials such as white board, black board, gold mirror, etc., to adapt to the requirements of the multispectral imager 6 for different spectral bands. When one sample box 7 is receiving fibers under the sample drop tube 4, another sample box 7 that has been prepared is located under the multispectral imager 6 for detection, realizing parallel pipeline operation of sample preparation and detection, greatly improving the overall detection throughput. The fixedly connected support legs 8 can ensure the stability of the whole machine. At the same time, the movable placement of the sample box 7 makes it easy to take it out for offline analysis or long-term storage.

[0029] Working principle: First, the operator places the clumps of cashmere fibers to be processed onto multiple fiber conveying paths of the conveying component. The ends of the fibers on each path are clamped by the pressure block 14. The bottom surface of the pressure block 14 is connected to a rubber pressure strip 16. At the same time, the tail negative pressure box 18 and the front negative pressure box 19 are both attached to the lower surface of the upper layer of the microporous conveyor belt 11. The tail negative pressure box 18 is responsible for adsorbing the ends of the fiber bundles. The fibers are attracted by the micropores of the microporous conveyor belt 11, forming a double fixation of negative pressure adsorption and physical compression. The conveying motor 15 drives the conveying drive roller 112 to rotate, which drives the microporous conveyor belt 11 to move. The fibers are conveyed forward with the microporous conveyor belt 11. When passing through the combing plate 12, the airflow combing component 2 starts to work. When the inner tube 24 rotates, the row of air holes 25 passes through the area of ​​the opening groove 26 in sequence. The direction of the airflow sprayed out changes from vertical to inclined relative to the fiber to be processed. First, it impacts the surface of the fiber bundle vertically downward to crush it. Then, it gradually tilts to generate lateral shear force to separate the adhered fibers. At the same time, the combing air guide chamber 110 of the combing plate 12 is independently connected to the external negative pressure air extraction device. The air guide hole 111 promptly draws away the blown airflow to avoid the airflow blowing randomly and forms a local low pressure area near the fiber to further press the fiber together, so that the fiber achieves high dispersion and directional arrangement. The fibers are then conveyed to the cutting blade 3. The blade holder 31 is fixedly connected to the partition plates 13 of two adjacent channels. The pneumatic pusher 32 pushes the connecting plate 33 to descend. The connecting plate 33 first drives the pressure plate 35 to descend via the spring 37. The pressure plate 35 first contacts the fiber bundle and presses it tightly. The spring 37 is compressed, generating gradually increasing pressure. Then the cutting blade 3 continues to descend to complete the cutting. At the same time, the ventilation duct 39 fixedly connected to the lower surface of the connecting plate 33 is connected to the folded airbag 38 on the upper surface of the pressure plate 35. The folded airbag 38 is compressed. The internal gas enters the ventilation chamber 312 of the cutting blade 3 through the ventilation duct 39 and the one-way ventilation port 313, and then is ejected from the air outlet groove 314 opened in the protrusion 34. The air outlet direction of the air outlet groove 314 is aligned with the blade bevel of the cutting blade 3, blowing the cut fiber segments off the blade and pushing them downward. After the cutting is completed, the pneumatic push rod 32 rises, the spring 37 releases the pressure, the pressure plate 35 is lifted first and then the cutting blade 3 is lifted, and the folding airbag 38 draws in air from the outside through the one-way air inlet port 310 to prepare for the next cut. The cut short fiber segments fall directly into the sample drop tube 4 below. An annularly arranged ionizing wire mesh 410 is fixedly connected inside the cavity of the ion ring 45. The ionizing wire mesh 410 is electrically connected to an external high-voltage line. Several flow-equalizing micro-holes 49 are opened on the inner side of the ion ring 45. The high voltage causes the ionizing wire mesh 410 to generate corona discharge. The positive and negative ions generated by ionizing the air diffuse evenly into the sample drop tube 4 through the flow-equalizing micro-holes 49, neutralizing the static electricity on the fiber surface. The opening direction of the first tangential air inlet 46 is inclined upwards along the tangent of the tube wall. 0°, the second tangential air inlet 47 is inclined upwards at 30°, and the third tangential air inlet 48 is set parallel to the tangent, forming a multi-stage pneumatic control from lifting to pushing, so that the fiber segments are dispersed under the action of swirling flow and sprayed evenly from the nozzle, falling into the sample box 7 below. The sample box 7 is movably placed in multiple sets of box slots 53 opened on the upper surface of the rotating base 51 of the detection turntable assembly 5. The rotating base 51 is rotatably connected to the circular limiting box 52. The turntable motor 56 drives the rotating base 51 to drive the sample box 7 to rotate. When one sample box 7. While receiving fibers below the sample drop tube 4, another sample box 7, which has already been prepared, is located directly below the multispectral imager 6. Simultaneously, the background plate 55 located below the rotating chassis 51 in the circular limiting box 52 is manually switched with different background materials via the locking ring 57 to adapt to the spectral detection requirements, thereby realizing parallel assembly line operation of sample preparation and detection. When the fibers are continuously conveyed to the cutting blade 3 via the microporous conveyor belt 11, the pressure block 14 is also conveyed to gradually approach the cutting blade 3. When the staff observes the pressure block 14... When the sample is about to reach the cutting blade 3, it means that the fiber has been cut into segments multiple times. The remaining fiber, as the clamped part, is damaged by the clamping pressure of the pressure block 14, resulting in damage to the surface scales and cuticle. That is, the remaining fiber cannot continue to be sampled. At this time, the device stops working, the pressure block 14 is removed and the remaining fiber is cleaned. At the same time, the pressure block 14 is put back into the upper belt of the microporous conveyor belt 11 away from the airflow combing component 2, so that the pressure block 14 can fix and clamp the fiber with negative pressure during the next sample preparation.

[0030] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0031] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rapid sample preparation device for fiber sample based on multispectral imaging detection, comprising a conveying assembly for placing the fiber to be prepared, a sample cutting blade (3) and a multispectral imager (6), characterized in that: The air flow imitating combing assembly (2) is arranged above the conveying assembly, a sample dropping pipe (4) is arranged directly below the part where the conveying assembly is connected with the sample cutting blade (3), the bottom end of the sample dropping pipe (4) is provided with a sample box (7), and the sample dropping pipe (4) is internally provided with an ion wind ring (45) and a plurality of air inlet units arranged along the tangential direction of the pipe wall; The conveying assembly comprises a conveying frame (1), the micro-porous conveying belt (11) is rotationally connected in the frame of the conveying frame (1), the micro-porous conveying belt (11) is provided with a plurality of fiber conveying paths, the conveying frame (1) is provided with a separating comb plate (12) arranged above the micro-porous conveying belt (11) between the two long side frames of the conveying frame (1), the micro-porous conveying belt (11) is provided with a negative pressure unit for fixing the fibers to be prepared into samples, and the separating comb plate (12) is provided with a separating comb air guide cavity (110). The air flow imitating combing assembly (2) comprises a fixed outer pipe (21) and a rotating inner pipe (24) which are movably sleeved, the bottom of the pipe body of the fixed outer pipe (21) is provided with an open slot (26), the pipe body of the rotating inner pipe (24) is provided with a plurality of row-shaped air holes (25), and the direction of the air flow sprayed by the row-shaped air holes (25) in the open slot (26) area is changed from vertical to inclined with respect to the fibers to be prepared into samples. The blade body of the sample cutting blade (3) is provided with an air outlet groove (314), and the air outlet direction of the air outlet groove (314) is aligned with the bevel of the blade edge of the sample cutting blade (3).

2. The rapid sample preparation device for fiber sample based on multispectral imaging detection according to claim 1, characterized in that: The conveying frame (1) is provided with a plurality of channel partitions (13) connected to the frame body, a fiber conveying path is formed between adjacent two channel partitions (13), the negative pressure unit comprises a tail end negative pressure box (18) and a front end negative pressure box (19) which are separately arranged on the two sides of the separating comb plate (12), the tail end negative pressure box (18) and the front end negative pressure box (19) are fixedly connected to the two long side frames of the conveying frame (1), and the tail end negative pressure box (18) and the front end negative pressure box (19) are attached to the lower surface of the upper layer of the micro-porous conveying belt (11), the upper layer of the micro-porous conveying belt (11) between adjacent two channel partitions (13) is provided with a pressing block (14), the arrangement area of the pressing block (14) is directly above the tail end negative pressure box (18), the pressing block (14) is a movable pressing block independent of the micro-porous conveying belt (11), the pressing block (14) is fixedly connected to the upper layer of the micro-porous conveying belt (11) by negative pressure adsorption and can move synchronously with the micro-porous conveying belt (11), the tail end of the fiber to be prepared into samples is clamped between the pressing block (14) and the belt body of the micro-porous conveying belt (11), and the bottom surface of the pressing block (14) is connected with a rubber pressing strip (16) which can be fixedly connected to the belt body of the micro-porous conveying belt (11) by negative pressure adsorption.

3. The rapid sample preparation device for fiber sample based on multispectral imaging detection according to claim 2, characterized in that: The conveying frame (1) is rotatably connected between the two long side frames, including a conveying drive roller (112), a conveying driven roller (113), and a guide roller (115). The conveying drive roller (112) and the conveying driven roller (113) are respectively located at both ends of the inner belt of the microporous conveyor belt (11). The guide roller (115) is located at the bending part of the belt of the microporous conveyor belt (11). A conveying motor (15) is fixedly connected to the outer wall of one long side frame of the conveying frame (1). The motor shaft of the conveying motor (15) is fixedly connected to the conveying drive roller (112) on the same axis. Rubber baffles (17) are connected to the two short side frames of the conveying frame (1), and the rubber baffles (17) are placed on the bending parts at both ends of the upper belt of the microporous conveyor belt (11).

4. The rapid sample preparation device for fiber sample based on multispectral imaging detection according to claim 2, characterized in that: The combing plate (12) and the upper belt of the microporous conveyor belt (11) located on both sides are arranged in the same plane. The upper plate surface of the combing plate (12) is provided with a number of air guide holes (111) that are connected to the combing air guide chamber (110). The opening positions of the air guide holes (111) are respectively located in the fiber conveying path area formed between two adjacent channel partitions (13). The channel angle of the air guide holes (111) gradually changes from vertical to inclined along the conveying direction of the fiber to be prepared. The channel angle of the air guide holes (111) corresponds to the direction of the airflow sprayed by the row air holes (25) in the opening groove (26) area. The tail negative pressure box (18), the front negative pressure box (19) and the combing air guide chamber (110) are independently connected to the external negative pressure extraction equipment.

5. The rapid sample preparation device for fiber sample detection based on multispectral imaging of claim 1, wherein: One end of the fixed outer tube (21) is fixedly connected to a rotating motor (22), the motor shaft of the rotating motor (22) is fixedly connected to the rotating inner tube (24) on the same axis, the other end of the fixed outer tube (21) is rotatably connected to a rotary sealing joint (27), and the rotating inner tube (24) is connected to an external high-pressure air pump through the rotary sealing joint (27). The two ends of the fixed outer tube (21) are fixedly connected to the two sides of the long side frame of the conveying frame (1) with support plates (23). The row of air holes (25) opened on the body of the rotating inner tube (24) are distributed in a ring at equal intervals, and the opening positions of each air hole of the adjacent row of air holes (25) are staggered.

6. The rapid sample preparation device for fiber sample detection based on multispectral imaging of claim 2, wherein: The cutting blade (3) is provided with a blade holder (31) and a connecting plate (33) and a pressure plate (35) located below the blade holder (31) on the side near the conveying frame (1). The blade holder (31) is fixedly connected to two adjacent channel partitions (13). The connecting plate (33) is connected to the upper end of the cutting blade (3). The pressure plate (35) is movably disposed at the lower end of the cutting blade (3). Both the connecting plate (33) and the pressure plate (35) are located on the side of the cutting blade (3) near the channel partition (13). The pressure plate (35) can be movably locked in place. Between two adjacent channel partitions (13), the plate body of the pressure plate (35) is connected to two vertically arranged limiting rods (36). The rod body of the limiting rod (36) moves through the connecting plate (33). The top of the limiting rod (36) is fixedly connected to a limiting top block (311). A spring (37) is movably sleeved on the rod body of the limiting rod (36) located below the connecting plate (33). A pneumatic push rod (32) is fixedly connected to the top of the frame of the knife holder (31). The telescopic rod of the pneumatic push rod (32) is fixedly connected to the connecting plate (33).

7. The rapid sample preparation device for fiber sample based on multispectral imaging detection according to claim 6, characterized in that: The lower plate of the connecting plate (33) is fixedly connected to a ventilation duct (39), and the upper plate of the pressure plate (35) is fixedly connected to a folded airbag (38). The ventilation duct (39) is connected to the folded airbag (38). The blade of the cutting blade (3) has a ventilation chamber (312) inside. The ventilation duct (39) and the ventilation chamber (312) are connected by a one-way ventilation interface (313). The ventilation duct (39) is also connected to a one-way air inlet interface (310). The blade of the cutting blade (3) is connected to a protrusion (34) at the junction of the blade edge and the blade body. The air outlet groove (314) is opened in the protrusion (34) and is connected to the ventilation chamber (312). The one-way ventilation interface (313) and the one-way air inlet interface (310) are both interfaces with built-in one-way valves.

8. The rapid sample preparation device for fiber sample detection based on multispectral imaging of claim 1, wherein: The upper end of the sample drop tube (4) is provided with a notch groove (41). The part of the conveying component that connects to the cutting blade (3) is placed in the notch groove (41). An ion wind ring (45) is embedded in the inner wall of the sample drop tube (4). An ionization wire mesh (410) is fixedly connected in the cavity of the ion wind ring (45). The ionization wire mesh (410) is electrically connected to an external high-voltage line. Several flow equalization microholes (49) are provided on the inner side of the ion wind ring (45).

9. The rapid sample preparation device for fiber sample detection based on multispectral imaging of claim 1, wherein: The sample drop tube (4) is configured from top to bottom as a vertical tube section, a constricted tube section, and an expanded tube section. The vertical tube section of the sample drop tube (4) has a first air inlet chamber (42), the constricted tube section of the sample drop tube (4) has a second air inlet chamber (43), and the expanded tube section of the sample drop tube (4) has a third air inlet chamber (44). The air inlet unit includes a first tangential air inlet hole (46), a second tangential air inlet hole (47), and a third tangential air inlet hole sequentially opened on the inner walls of the vertical tube section, the constricted tube section, and the expanded tube section of the sample drop tube (4). (48) The first tangential air inlet (46) and the ion wind ring (45) are both connected to the first air inlet chamber (42), the second tangential air inlet (47) is connected to the second air inlet chamber (43), and the third tangential air inlet (48) is connected to the third air inlet chamber (44). The opening direction of the first tangential air inlet (46) is inclined upward at 60° along the tangent of the pipe wall, the opening direction of the second tangential air inlet (47) is inclined upward at 30° along the tangent of the pipe wall, and the opening direction of the third tangential air inlet (48) is parallel to the tangent of the pipe wall.

10. The rapid sample preparation device for fiber sample detection based on multispectral imaging of claim 1, wherein: Below the sample drop tube (4), a detection turntable assembly (5) is also provided. The detection turntable assembly (5) includes a rotating base (51) and a circular limiting box (52). The rotating base (51) is rotatably connected to the circular limiting box (52). The upper surface of the rotating base (51) has multiple sets of box slots (53). Each set of box slots (53) is corresponding to the sample drop tube (4). The sample box (7) is movably placed in the box slot (53). The circular limiting box (52) is also provided with a background base plate (55) located below the rotating base (51). A locking ring (57) is fixedly connected to the outer periphery of the background base plate (55). The locking ring (57) is rotatably locked onto the inner wall of the circular limiting box (52). The circular limiting box (52) is... The wall is provided with a manual adjustment groove (54), and part of the ring of the locking ring (57) is exposed in the manual adjustment groove (54). The bottom of the circular limiting box (52) is fixedly connected to a turntable motor (56). The motor shaft of the turntable motor (56) is fixedly connected to the rotating chassis (51) on the same axis. A multispectral imager (6) is provided above the rotating chassis (51). An imager fixing bracket (61) is connected between the multispectral imager (6) and the circular limiting box (52). The rotating chassis (51) is driven by the turntable motor (56) to drive any two sets of the box grooves (53) to be respectively set below the sample drop tube (4) and the multispectral imager (6). Support legs (8) are fixedly connected below the circular limiting box (52) and the conveying frame (1).

Images