Continuous fiber air flow blowing and separating device and method

Abstract

The present invention provides a continuous fiber air-jet splitting device and method. A fiber bundle is pulled from front to back through the splitting device. The splitting device comprises a frame, a first mechanical roller, a second mechanical roller, and a plurality of rear mechanical rollers arranged in parallel on the frame from front to back, a longitudinal vibrating roller, an air-jet device, and a transverse vibrating roller. The longitudinal vibrating roller is disposed between the first and second mechanical rollers and is vibrated vertically back and forth by a longitudinal motion unit. The air-jet device is disposed behind the longitudinal vibrating roller, and the transverse vibrating roller is vibrated horizontally back and forth perpendicular to the direction in which the fiber bundle is pulled by the transverse motion unit. The present invention utilizes the changes in fiber tension in the fiber bundle during the longitudinal vibration splitting process and uses air jets to split the fibers while the fibers are in a suspended state, thereby achieving stable, uniform, damage-free, and sufficient splitting of the fiber bundle under low tension.

Description

Technical Field

[0001] The present invention relates to the field of continuous high-performance fiber-reinforced composite material manufacturing, and in particular to a continuous fiber airflow blowing and separating device and method. Background Art

[0002] In recent years, with the increasing demand for continuous fiber-reinforced composites, there is an urgent need to improve the mechanical properties and production efficiency of composite materials. Studies have shown that after fiber splitting, the thickness of the fiber bundle becomes thinner, which helps to improve the bonding effect between the composite matrix and the fiber, and increase the damage tolerance and mechanical properties of the composite. Currently, the continuous fiber spreading process is mainly based on mechanical fiber spreading, and also includes vibration / ultrasonic splitting, airflow splitting, and electrostatic splitting technologies. Mechanical or vibration splitting directly acts on the fiber bundle and requires high fiber tension, so it causes greater damage to the fiber bundle. However, due to its stable structure, mechanical splitting is more stable.

[0003] Airflow splitting diffuses fiber bundles through airflow pressure difference, which requires the fiber tension to remain relaxed. Therefore, it causes less damage to the fiber bundles. However, since the fiber bundles are in a relaxed state, they are easily affected by airflow fluctuations and environmental changes, and their stability is poor. Among the published airflow splitting technologies, most are internal suction airflow splitting methods, which use a cavity with a certain structure to form a splitting flow field. For example, CN104862796A and CN1173083C are prone to turbulence after being disturbed by fiber tension or airflow during the airflow splitting process. In addition, the size of the internal suction fiber spreader cavity is limited, making it difficult to split a wide unidirectional tape composed of multiple fiber bundles at the same time. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a continuous fiber air flow blowing filament separation device and method to solve the problem that the existing filament separation technology is difficult to take into account the fiber spreading width, fiber spreading breakage rate, fiber spreading uniformity and fiber spreading stability.

[0005] In order to solve the above technical problems, the technical solution of the present invention is:

[0006] According to one aspect of the present invention, a continuous fiber air flow blowing and separating device is provided, in which the fiber bundle is pulled from front to back through the separating device, and the separating device is characterized in that the separating device includes a frame, a first mechanical roller, a second mechanical roller and a plurality of rear mechanical rollers arranged in parallel on the frame from front to back, a longitudinal vibration roller, an air flow blowing device and a transverse vibration roller, wherein the longitudinal vibration roller is arranged between the first mechanical roller and the second mechanical roller, and the longitudinal vibration roller realizes vertical reciprocating vibration through a longitudinal motion unit; the air flow blowing device is arranged behind the longitudinal vibration roller, and continuously blows the fiber bundle at an adjustable angle during the longitudinal vibration process, and the transverse vibration roller performs horizontal reciprocating vibration perpendicular to the pulling direction of the fiber bundle through the transverse motion unit.

[0007] Optionally, in the above-mentioned continuous fiber air flow blowing and separating device, the longitudinal motion unit includes a longitudinal slider, a longitudinal crank and a first motor which are sequentially connected to the longitudinal vibration roller, and the first motor is fixed on the first fixed seat of the frame.

[0008] Optionally, in the above-mentioned continuous fiber air flow blowing and separating device, the transverse motion unit includes a transverse slider, a transverse crank and a second motor connected to the transverse vibration roller in sequence, and the second motor is fixed on the second fixed seat of the frame.

[0009] Optionally, in the above-mentioned continuous fiber air flow blowing and separating device, the air flow blowing device includes multiple air flow nozzles, air flow distributors, air pipes, switching valves and air flow meters. The air flow distributor is fixed to the rotating rod through a support. The two ends of the rotating rod are fixed by two bearing seats. The two bearing seats are respectively fixed on two sliders. The two sliders are respectively installed on two guide rods of the frame. The two guide rods are arranged perpendicular to the first mechanical roller and the second mechanical roller.

[0010] Optionally, in the above-mentioned continuous fiber air flow blowing and separating device, a fixed block is provided on the side of the frame, the rocker is arranged on the fixed block, and one end of the rocker is detachably fixed to the rotating rod.

[0011] Optionally, the above-mentioned continuous fiber air flow blowing and separating device further includes a reciprocating motion unit, which is a crank slider mechanism. The air flow blowing device can realize linear reciprocating motion under the drive of the reciprocating motion unit.

[0012] Optionally, the above-mentioned continuous fiber air flow blowing and separating device comprises a plurality of transverse vibrating rollers, and at least one of the plurality of transverse vibrating rollers is installed behind the second mechanical roller.

[0013] Optionally, in the above-mentioned continuous fiber air flow blowing and separating device, the distance between the first mechanical roller and the second mechanical roller is greater than the distance between the rear mechanical rollers.

[0014] According to one aspect of the present invention, a method for separating fibers of the above-mentioned continuous fiber air-blowing separating device is provided, comprising: after the continuous fiber bundle passes through the yarn guide unit, it is introduced into the separating device at a constant interval, the introduced fiber bundle passes through the first mechanical roller, the longitudinal vibration roller, the air-blowing device, the second mechanical roller, the transverse vibration roller and the subsequent mechanical roller in sequence, the fiber bundle is longitudinally vibrated and fixedly air-blown between the first mechanical roller and the second mechanical roller, and then passes through the transverse vibration roller to promote the fusion between multiple fiber bundles and improve the uniformity of the separation; finally, it passes through multiple rear mechanical rollers in an S-shape in sequence to complete the continuous separation of the fiber bundle.

[0015] Optionally, in the above-mentioned wire separation method, the vibration amplitude of the transverse vibration roller is less than 10 mm, and the vibration frequency is adjusted between 0-20 Hz; the vibration amplitude of the longitudinal vibration roller is between 0-25 mm, and the vibration frequency is between 0-200 Hz; and the air flow blowing device blows normal temperature air flow, or blows high temperature air flow of 100-200°C by adding an air heater at the front end.

[0016] The beneficial effects of the present invention are:

[0017] The continuous fiber airflow blowing and separating device of the present invention has a relatively simple structure and can be expanded according to usage requirements. The device can adjust the air flow and vibration parameters according to the fiber type or usage requirements, and utilizes the simultaneous action of the blowing airflow and the horizontal / vertical vibration rollers to separate the fiber bundles. While retaining the high efficiency and low damage advantages of airflow separation, the vibration roller provides a regular relaxation state of the fiber bundle, limits the formation of fiber single filament defects, and obtains a uniformly widened fiber unidirectional belt. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the specific implementation or the description of the prior art.

[0019] Figure 1 2. It is a front structural schematic diagram of a continuous fiber air flow blowing and separating device according to an embodiment of the present invention;

[0020] Figure 2 A schematic structural diagram of a preferred embodiment according to the present invention;

[0021] Figure 3 Schematic diagram of the airflow blowing device of the wire separation device of the present invention;

[0022] Figure 4 An angle adjustment device for the airflow blowing device of the wire separating device of the present invention;

[0023] Figure 5 A longitudinal vibration device for the yarn separation device of the present invention;

[0024] Figure 6 A transverse vibration device for the yarn separation device of the present invention;

[0025] Figure 7 This is a schematic diagram of a usage state of the present invention.

[0026] Explanation of the accompanying drawings: 1. Longitudinal vibration device, 11. Longitudinal crank, 12. Longitudinal vibration roller, 13. First motor, 14. First motor seat, 15. Longitudinal slider, 2. Air flow blowing device, 21. Air flow nozzle, 22. Air flow distributor, 23. Slide block, 24. Guide rod, 25 Rotating rod, 26. Bearing seat, 27. Support, 28. Rocker, 29. Fixed block, 3. Reciprocating motion unit, 4. Rear end lateral vibration device, 41. First lateral vibration roller, 42. Fixed seat, 43. Transverse crank, 44. Second motor, 45. Transverse slider, 5. Frame, 6. Front end lateral vibration device, 61. Second lateral vibration roller, 7. Rear mechanical roller, 71. First mechanical roller, 72. Second mechanical roller, 8. Yarn guide unit, 9. Fiber bundle. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0028] The continuous fiber air flow blowing and separating device of the present invention, the fiber bundle is pulled from front to back through the separating device, and is characterized in that the separating device includes a frame, a first mechanical roller, a second mechanical roller and a plurality of rear mechanical rollers arranged in parallel on the frame from front to back, a longitudinal vibration roller, an air flow blowing device and a transverse vibration roller, wherein the longitudinal vibration roller is arranged between the first mechanical roller and the second mechanical roller, and the longitudinal vibration roller realizes vertical reciprocating vibration through a longitudinal motion unit; the air flow blowing device is arranged behind the longitudinal vibration roller, and continuously blows the fiber bundle at an adjustable angle during the longitudinal vibration process, and the transverse vibration roller performs horizontal reciprocating vibration perpendicular to the pulling direction of the fiber bundle through the transverse motion unit.

[0029] The vibration frequency and amplitude of the device are adjustable, and the airflow spraying pattern can be switched, including fixed-angle spraying, reciprocating spraying in the fiber pulling direction, and fixed-position arc spraying. To meet different fiber bundle types or different splitting requirements, the parameters of various fiber spreading methods can be adjusted to achieve effective splitting. Based on mechanical fiber spreading, this device utilizes the changes in fiber tension during longitudinal vibration splitting, using airflow to split the fibers while they are suspended. This ensures stable, uniform, damage-free, and sufficient splitting of the fiber bundle under low tension.

[0030] See also Figure 1 、 Figure 2 and Figure 7 , which is a preferred embodiment of the continuous fiber airflow blowing separator of the present invention, the fiber bundle 9 is pulled from front to back through the separator (such as Figure 7As shown), the wire separation device includes: a frame 5, a first mechanical roller 71, a second mechanical roller 72 and six rear mechanical rollers 7 arranged in parallel on the frame 5 from front to back, a longitudinal vibration roller 12 and a longitudinal motion unit, a first and a second transverse vibration rollers 41, 61 and a transverse motion unit, and an air flow blowing device 2.

[0031] The longitudinal vibration roller 12 is arranged between the first mechanical roller 71 and the second mechanical roller 72, and the longitudinal vibration roller realizes vertical reciprocating vibration through the longitudinal motion unit. Figure 2 and Figure 5 As shown, the longitudinal vibration roller 12 and the longitudinal motion unit constitute the longitudinal vibration device 1. The longitudinal motion unit includes a longitudinal slider 15, a longitudinal crank 11 and a first motor 13 connected in sequence to the longitudinal vibration roller 12. The first motor 13 is fixed to the first fixed seat 14 of the frame 5. The longitudinal vibration roller 12 drives the crank slider mechanism (longitudinal crank 11 and longitudinal slider 15) through the first motor 13 to achieve vertical reciprocating vibration. The vibration amplitude of the longitudinal vibration device 1 can be adjusted by the length of the circular longitudinal crank 11. The vibration frequency of the longitudinal vibration device 1 is controlled by the speed of the DC first motor 13. The speed n of the first motor 13 and the vibration frequency f can be converted to each other by n=60 / f. The position of the first fixed seat 14 on the frame 5 can be adjusted by bolts to adjust the pressing depth of the vibration roller.

[0032] The transverse vibration roller is horizontally reciprocated and vibrated in a direction perpendicular to the fiber bundle pulling direction through the transverse motion unit. The first transverse vibration roller 41 and the transverse motion unit constitute the rear end transverse vibration device 4. Figure 6 As shown, the lateral motion unit includes a lateral slider 45, a lateral crank 43, and a second motor 44, which are sequentially connected to the first lateral vibration roller 41. The second motor 44 is fixed to the second fixed seat 42 of the frame 5. The first lateral vibration roller 41 is connected to the lateral slider 45 via a threaded connection. The lateral vibration frequency and vibration amplitude are adjusted in the same manner as the longitudinal vibration device. The installation and composition of the front lateral vibration roller are similar to those described above. Preferably, multiple lateral vibration rollers can be installed before and after the longitudinal vibration roller, that is, installed in front of and behind the airflow blowing device 2. Preferably, at least one lateral vibration roller is installed behind the second mechanical roller 72.

[0033] like Figure 7 As shown, a transverse vibration fiber spreading unit can be provided in front of the first mechanical roller 71 and behind the second mechanical roller 72. The second transverse vibration roller 61 is provided in front of the first mechanical roller 71, and the second transverse vibration roller 6 and its motion unit constitute the front end transverse vibration device 6 (as shown in FIG. Figure 1The front second transverse vibrating roller 61 can optimize the initial flattening effect of the mechanical roller on the fiber bundle. The number of the front second transverse vibrating rollers 61 can be set to 0 to 3 depending on the flattening requirements. At least one rear first transverse vibrating roller 41 should be set behind the second mechanical roller 72 to promote the mutual fusion of multiple fiber bundles, effectively improve the uniformity of the longitudinal vibration + fixed airflow, and promote the fusion of multiple fiber bundles.

[0034] The airflow blowing device 2 is arranged behind the longitudinal vibrating roller 12, that is, the longitudinal vibrating roller 12 is in front and the airflow blowing device 2 is in the back. During the longitudinal vibration process, the airflow blowing device 2 continuously blows the fiber bundle at an adjustable angle. The airflow blowing device 2 includes an airflow nozzle 21, an airflow distributor 22, an air pipe, a switching valve, and an air flow meter. The airflow velocity is adjusted by changing the air flow rate, and the shape of the blowing flow field is changed by the airflow nozzle 21. The airflow blowing device 2 includes multiple airflow nozzles 21, and the number of airflow nozzles 21 can be adjusted according to the number of fiber bundles to be separated. When the airflow nozzles 21 are spraying at a fixed angle, they must correspond one-to-one with the number of fibers. However, when using a horizontal / vertical reciprocating airflow blowing method, this does not need to correspond one-to-one with the number of fibers.

[0035] like Figure 1 、 Figure 2 and Figure 7 As shown, preferably, the airflow blowing device 2 is disposed between the longitudinal vibrating roller 12 and the second mechanical roller 72. The airflow distributor 22 is fixed to the rotating rod 25 via a support 27. The rotating rod 25 is fixed at both ends by two bearing blocks 26, allowing the airflow distributor 22 to achieve different angles of blowing. The two bearing blocks 26 are respectively fixed to two sliders 23, and the two sliders 23 are respectively mounted on two guide rods 24 of the frame 5. Each of the two guide rods 24 is perpendicular to the first mechanical roller 71 and the second mechanical roller 72 and is disposed at the end of the first mechanical roller 71 and the second mechanical roller 72. Driven by the reciprocating motion unit 3 (reciprocating motion unit 3 is a crank slider mechanism), the two sliders 23 can achieve linear reciprocating motion on the guide rods 24, thereby driving the airflow blowing device 2 to achieve linear reciprocating motion, wherein the reciprocating motion unit 3 is a crank slider mechanism. A threaded hole is provided on the side of the airflow distributor 22 for installing a trachea quick connector. Through the trachea connected to the trachea quick connector, the airflow is transmitted from the air compressor to the air flow meter and ultimately flows into the airflow distributor.

[0036] See also Figure 1 A rocker mechanism is provided on the side of the frame 5, and the rocker mechanism is composed of a fixed block 29 and a rocker 28, as shown in FIG. Figure 4As shown, the fixed block 29 is sandwiched between the rocker 28, and one end of the rocker 28 is detachably fixed to the rotating rod 25. While the reciprocating motion unit 3 pushes the airflow nozzle to move back and forth in a straight line, the rocker 28 drives the rotating rod 25 to rotate back and forth, forming an arc-shaped blowing effect. By changing the position of the fixed block 29, the arc-shaped blowing angle of the airflow blowing device can be changed. The movement form of the airflow blowing device 2 can be adjusted separately. The airflow blowing device 2 can be fixed in position, reciprocated in the horizontal direction, and realize arc-shaped blowing through the rocker. After the fiber bundle passes through the filament separation device, the subsequent mechanical roller keeps the fiber bundle widened in a stable state. Specifically, the airflow blowing mode of the airflow blowing device 2 is convertible, including fixed-angle blowing, reciprocating blowing in the fiber pulling direction, and arc-shaped blowing at a fixed position. In fixed-angle blowing, the reciprocating unit 3 remains fixed, and the angle of the rocker 28 can be changed by changing the horizontal position of the fixed block 29 on the frame, thereby adjusting the airflow blowing angle; in the reciprocating blowing in the fiber drawing direction, the reciprocating unit 3 maintains a certain frequency of reciprocating motion, and the rocker 28 is removed, and the airflow blowing device 2 can realize linear reciprocating blowing; in the arc blowing at a fixed position, the reciprocating unit 3 maintains a certain frequency of reciprocating motion, and the rocker 28 is fixed on the rotating rod 25, and the position of the rocker 28 near the other end is fixed on the fixed block 29. By changing the position of the fixed block 29, the arc blowing of the airflow blowing device can be realized.

[0037] The fiber splitting device of the present invention is arranged on an eight-roller mechanical fiber spreader with adjustable temperature and angle. Specifically, the longitudinal vibration roller and the air blowing device are arranged between the first two mechanical rollers of the mechanical fiber spreader, and the transverse vibration rollers are arranged before and after the longitudinal vibration and blowing fiber splitting device. The number of transverse vibration rollers can be adjusted independently according to the specific fiber characteristics and fiber splitting requirements. Preferably, the number of transverse vibration rollers at the front end is 0-3, and the number of transverse vibration rollers at the rear end is 1-3. The mechanical fiber spreader contains eight mechanical rollers arranged in parallel. The spacing between the first and second mechanical rollers is slightly larger than the spacing between the rear mechanical rollers to facilitate the installation of the fiber splitting device and provide it with sufficient working distance. Specifically, the longitudinal vibration roller 12 is arranged between the first two mechanical rollers, and the air blowing device 2 is arranged behind the longitudinal vibration roller 12. A mechanical roller is arranged before and after the transverse and longitudinal vibration rollers, perpendicular to the pulling direction of the fiber bundle and keeping the fiber bundle straight. The longitudinal vibration device, airflow injection device, and transverse vibration device in the device each have a motion unit. The transverse / longitudinal vibration rollers and airflow injection device are driven by a crank mounted above the frame. The vibration amplitude and frequency are adjusted by the crank length and motor speed, respectively. The injection device can be fixed in position, reciprocate horizontally, and achieve arc-shaped injection using a rocker. After the fiber bundle passes through the separator, the subsequent mechanical roller maintains the stable widening state of the fiber bundle.

[0038] The continuous fiber air jet splitting device of the present invention performs the following splitting operation: a continuous fiber bundle 9 is drawn from a tension-adjustable creel, positioned by a yarn guide unit 8, and then introduced into the splitting device at a constant pitch. The introduced fiber bundle sequentially passes through a first mechanical roller 71, a longitudinal vibrating roller 12, an air jet device 2, a second mechanical roller 72, a transverse vibrating roller 41, and a rear mechanical roller 7 to complete the continuous splitting of the fiber bundle. First, the fiber bundle passes horizontally through the first two mechanical rollers, where it undergoes longitudinal vibration and fixed air jet splitting between the two rollers. It then passes through the transverse vibrating roller to promote fusion between the multiple fiber bundles and improve splitting uniformity. Finally, the fiber bundle passes sequentially through the rear mechanical roller in an S-shaped pattern, completing the splitting process.

[0039] Each mechanical roller can achieve self-adjustable temperature control from 0 to 300°C. Normally, the temperature of the mechanical rollers rises in a gradient, and the maximum temperature does not exceed the impregnation mold temperature and the fiber oxidation temperature, thereby softening the fiber sizing agent, reducing the entanglement resistance of the monofilaments, and improving the fiber bundle separation efficiency. The heating device of each mechanical roller group can heat the fiber bundle at a constant temperature. The horizontal and longitudinal vibration rollers are made of hollow lightweight materials to reduce the impact force caused by vibration. Since the vibration rollers are not in continuous contact with the fiber bundles, they do not need to have a heating function. The airflow blowing device can spray airflow at room temperature, or it can spray high-temperature airflow of 100-200°C by adding an air heater at the front end. Since the sizing agent of the fiber bundle has been softened after being heated by the mechanical rollers, spraying airflow at room temperature can also meet the separation requirements of some fiber bundles.

[0040] During the silk splitting process, the vibration frequency and vibration amplitude required by the transverse / longitudinal vibration rollers are different: the transverse vibration roller mainly drives the fiber monofilaments to move horizontally by friction, thereby realizing the adjustment of the uniformity of silk splitting. Therefore, the transverse vibration amplitude cannot be too large and is controlled below 10mm, preferably 5-10mm, and the transverse vibration frequency range is 0-20Hz, preferably between 5-20Hz, and more preferably between 10-15Hz; the longitudinal vibration roller mainly plays the role of dispersing the fiber bundles and relaxing the fiber tension during the vibration process, maintaining the draping shape of the fiber bundles and splitting the fiber bundles, and providing a working space for the blowing airflow. A higher upper limit of the longitudinal vibration frequency is required, which is in the range of 0-200Hz, preferably between 10-50Hz. In order to ensure the stability of fiber spreading, the longitudinal vibration amplitude should not be too large, and the variation range is 0-25mm, preferably between 10-25mm, and preferably between 10-20mm.

[0041] The present invention provides a fiber splitting device and method for splitting fibers with poor fracture toughness, such as carbon fibers, into multiple bundles with wide widths. The fiber bundles are extracted under a relatively low fiber release tension and arranged at a constant pitch by a yarn guide comb. The fiber bundles pass in a line above the first two mechanical rollers. A longitudinal vibration roller is provided between the two mechanical rollers, and the vibration roller applies vertical vibrations of a certain frequency and amplitude to the fiber bundles. During the vibration process, the fiber bundles are first pressed down by the vibration roller, and the fiber bundles are tightened. Then, during the lifting of the vibration roller, the fiber bundles are in a suspended, relaxed state. A jet airflow is continuously applied behind the longitudinal vibration roller. The airflow does not have a splitting effect when the fiber bundles are in a taut state. When the fiber bundles are in a suspended, relaxed state, the jet airflow utilizes a fan-shaped air flow field to deflect the fiber bundles to both sides by using the fan-shaped air flow field, so that the fiber bundles are widened and thinned under the action of tension and traction. The airflow blowing device consists of multiple fan-shaped airflow nozzles, each corresponding to a fiber bundle. To improve the fiber spreading effect, the airflow blowing device can be driven by a crank to perform reciprocating motion at a fixed blowing angle to increase the airflow action time. The rocker can also be used to perform arc-shaped reciprocating spraying at a fixed position. After passing through the airflow blowing device, the fiber bundle is interspersed with the transverse vibrating roller. The fiber bundle is subjected to the friction of the transverse vibrating roller, overcoming the fiber tension and entanglement resistance, causing the position of the bottom fiber on the mechanical roller to shift, deflecting the thicker fiber monofilaments to the thinner ones, and adjusting the uniformity of fiber spreading. After passing through the transverse vibrating roller, the fiber bundle is interspersed with multiple mechanical rollers in an S shape, which promotes the widening of the fiber bundle to remain stable, and ultimately completes the low-damage and uniform fiber separation of the fiber bundle.

[0042] The present invention will be further described below through specific embodiments. The following examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples.

[0043] Example 1

[0044] The fiber bundle is introduced through the yarn guide at a payout tension of 2N. The bundle then passes in an S-shaped pattern through a first mechanical roller, a longitudinal vibrating roller, an air blower, a transverse vibrating roller, a second mechanical roller, and subsequent mechanical rollers, completing the longitudinal vibration and air blown separation of the bundle. The temperature of the mechanical rollers is gradually increased from the softening point of the sizing agent to the die temperature to ensure that the sizing agent in the fiber bundle is softened upon passing through the first mechanical roller, allowing the air blown at room temperature to separate the fibers. The longitudinal vibrating roller is somewhat effective for separating the fiber bundle at higher tensions. However, for separating fiber bundles with poor fracture toughness, such as carbon fiber bundles, a payout tension of 2N or less is required. In this case, the device relies more heavily on the air blown for separation. To accommodate different required spread widths, the fan-shaped airflow angle of the airflow nozzle is adjustable, ranging from 65° to 120°. To achieve a larger spread width, the airflow flow rate can be increased while also increasing the effective distance between the airflow nozzle and the fiber bundle. This increases the effective width of the airflow while maintaining the same fan-shaped flow angle. During the filament separation process, the vibrating roller and the air flow continuously interact. The vibration frequency of the longitudinal vibrating roller is 10 Hz, the vibration amplitude is 20 mm, the air nozzle sprays a 120° fan-shaped air flow at 10 m / s, the distance between the nozzle and the fiber bundle is 15 mm, and the air flow blowing device remains fixed.

[0045] Example 2

[0046] On the basis of Example 1, the position of the filament separation device of transverse / longitudinal vibration + air blowing is moved back, 2-5 mechanical rollers are added in front of the longitudinal vibration roller, and a transverse vibration roller is added thereto, so that the fiber bundle is fully untwisted and flattened before entering the longitudinal vibration / air blowing filament separation stage. The transverse vibration roller should be located between two fixed mechanical rollers, with a vibration frequency of 20 Hz and a vibration amplitude of 10 mm. The surface roughness of the transverse vibration roller is usually greater than or equal to the roughness of the mechanical roller, so as to achieve the effect of driving the fiber monofilament to move transversely. When multiple transverse vibration rollers act at the same time, it is necessary to ensure that the vibration rollers act on the upper and lower layers of the fiber bundle respectively. The temperature of the air flow blown out by the air blowing device 2 is below 150°C. Combined with the heat radiation generated by the heating of the mechanical roller, the sizing agent of the fiber bundle can be further softened. The rest of the content is the same as Example 1.

[0047] Example 3

[0048] On the basis of Example 1, the spacing between the first two mechanical rollers is increased, preferably to 45-75 cm compared to the original spacing of 30 cm. The spacing between the first two mechanical rollers should not be too large to maintain the stability of the fiber spreading, and preferably the spacing is between 45-65 cm. The airflow blowing device is driven to move back and forth by the airflow motion device 3 to obtain a larger airflow blowing range. While the fiber bundle is subjected to longitudinal vibration, a reciprocating linear motion or a reciprocating arc-shaped blowing airflow is applied to it. Multiple sets of longitudinal vibration rollers are added between the first two mechanical rollers to alleviate the problem of decreased fiber bundle filament separation stability caused by excessive fiber overhang length. The rest of the content is the same as Example 1.

[0049] The width, breakage rate (the quality of broken fibers after spreading a 4-meter fiber bundle), and uniformity (the proportion of grayscale defects in the fiber image) of the single fiber bundles after splitting in the above-mentioned embodiment were tested. Five samples were taken from each group. The results are shown in Table 1 below:

[0050] Table 1

[0051]

[0052] The present invention combines the advantages and disadvantages of various fiber separation processes and designs a continuous fiber airflow blowing fiber separation device based on the fiber spreading principle. While retaining the high efficiency and low damage advantages of airflow fiber separation, it provides a regular fiber bundle relaxation state through a vibrating roller to limit the formation of fiber single filament defects.

[0053] The above embodiments are only specific implementation methods of the present invention, which are used to illustrate the technical solutions of the present invention, rather than to limit them. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that any person skilled in the art can modify or improve the technical solutions described in the above embodiments within the technical scope disclosed by the present invention, or replace some of the technical features therein with equivalents. Such modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A continuous fiber air jet separation device, wherein the fiber bundle is pulled from front to back through the separation device, characterized in that: The wire separation device includes a frame, a first mechanical roller, a second mechanical roller and a plurality of rear mechanical rollers arranged in parallel on the frame from front to back, a longitudinal vibration roller, an air flow blowing device and a plurality of transverse vibration rollers, wherein: The longitudinal vibration roller is arranged between the first mechanical roller and the second mechanical roller, and the longitudinal vibration roller realizes vertical reciprocating vibration through a longitudinal motion unit; The plurality of transverse vibrating rollers are configured to perform horizontal reciprocating vibrations in a direction perpendicular to the fiber bundle pulling direction through a transverse motion unit, and a first transverse vibrating roller of the plurality of transverse vibrating rollers is arranged behind the second mechanical roller, and a second transverse vibrating roller of the plurality of transverse vibrating rollers is arranged in front of the first mechanical roller; The airflow blowing device is arranged between the longitudinal vibration roller and the second mechanical roller, and the airflow blowing device continuously blows the fiber bundle at an adjustable angle during the longitudinal vibration process.

2. The continuous fiber air flow blowing and separating device according to claim 1, characterized in that: The longitudinal motion unit includes a longitudinal slider, a longitudinal crank and a first motor which are sequentially connected to the longitudinal vibration roller. The first motor is fixed on a first fixing seat of the frame.

3. The continuous fiber air flow blowing and separating device according to claim 1, characterized in that: The transverse motion unit includes a transverse slider, a transverse crank, and a second motor which are sequentially connected to the transverse vibration roller. The second motor is fixed on a second fixing seat of the frame.

4. The continuous fiber air flow blowing and separating device according to claim 1, characterized in that: The airflow blowing device includes multiple airflow nozzles, an airflow distributor, an air pipe, a switching valve and an air flow meter. The airflow distributor is fixed to the rotating rod through a support. The two ends of the rotating rod are fixed by two bearing seats. The two bearing seats are respectively fixed on two sliders. The two sliders are respectively installed on the two guide rods of the frame. The two guide rods are arranged perpendicular to the first mechanical roller and the second mechanical roller.

5. The continuous fiber air flow blowing and separating device according to claim 4, characterized in that: A fixing block is provided on the side of the frame, a rocker is provided on the fixing block, and one end of the rocker is detachably fixed to the rotating rod.

6. The continuous fiber air flow blowing and separating device according to claim 1, characterized in that: It also includes a reciprocating motion unit, which is a crank slider mechanism. The airflow blowing device can realize linear reciprocating motion under the drive of the reciprocating motion unit.

7. The continuous fiber air flow blowing and separating device according to claim 1, characterized in that: The spacing between the first mechanical roller and the second mechanical roller is greater than the spacing between the rear mechanical rollers.

8. The method for separating continuous fibers using a continuous fiber airflow blowing device according to claim 1, characterized in that: include: After passing through the yarn guide unit, the continuous fiber bundle is introduced into the silk separation device at a constant interval. The introduced fiber bundle passes through the second transverse vibration roller, the first mechanical roller, the longitudinal vibration roller, the air flow blowing device, the second mechanical roller, the first transverse vibration roller and the subsequent mechanical roller in sequence. The fiber bundle is longitudinally vibrated and fixedly blown with air flow separation between the first mechanical roller and the second mechanical roller, and then passes through the first transverse vibration roller to promote the fusion between multiple bundles of fibers and improve the uniformity of silk separation; finally, it passes through the multiple rear mechanical rollers in an S shape in sequence to complete the continuous silk separation of the fiber bundle.

9. The method for separating continuous fibers using a continuous fiber airflow blowing device according to claim 1, wherein: The vibration amplitude of the transverse vibration roller is less than 10 mm, and the vibration frequency is adjusted between 5-20 Hz; the vibration amplitude of the longitudinal vibration roller is between 10-25 mm, and the vibration frequency is between 10-200 Hz; and the air flow blowing device blows normal temperature air flow, or blows high temperature air flow of 100-200°C by adding an air heater at the front end.

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