Carbon fiber tow width expanding device for equal-path space displacement conversion

Abstract

The invention discloses a carbon fiber tow width expanding device for equal-path space displacement conversion, which comprises a tow unwinding device, a heating device, an equal-path space displacement conversion device section and a tow winding device which are arranged in sequence, the equal-path space displacement conversion device section is composed of a first limiting element, an equal-path space displacement conversion element and a second limiting element. The first limiting element and the second limiting element are located in front of and behind the equal-path space displacement conversion element respectively, and the equal-path space displacement conversion element is provided with an equal-path space displacement conversion curved surface which forms an inclined angle with a tow width plane. By means of the equal-path space displacement conversion curved surface on the equal-path space displacement conversion element, plane broadening motion of tow fibers is converted into space displacement motion, so that each tow has displacement in the width direction and displacement in the height direction, and each tow has the same displacement path length; therefore, the tension is uniform, and a better tow broadening effect can be achieved.

Description

Technical Field

[0001] This invention belongs to the field of textile machinery, and specifically relates to a carbon fiber bundle width expansion device for equal path spatial displacement conversion. Background Technology

[0002] Currently, automatic fiber spreaders for high-performance composite fibers commonly use fiber strand widths of 25 / 75 / 150 / 300mm. Therefore, a fiber bundle widening device is needed to flatten the raw fiber bundles at the factory to achieve the standard usable width. Furthermore, in the application of high-performance composite fibers, further processing such as braiding, weaving, and laying of the raw fiber bundles after widening them allows for the production of thinner fiber products, which also improves the strength and various performance indicators of these products. A specialized "thin-layer technology" has emerged, and the raw materials used in this technology are obtained by widening the fiber bundles.

[0003] Common methods for widening filament bundles include vibration, ultrasound, airflow, electrostatics, or combinations of these methods. These methods are essentially planar, meaning the filament bundles move within a plane parallel to the bundle's width. In reality, the process of widening the filament bundle occurs concurrently with the unwinding of the narrow bundle and the winding of the widened bundle; it is a continuous process between the unwinding of the narrow bundle and the winding of the wide bundle.

[0004] During the expansion of the filament bundle, the bundle is inevitably subjected to a traction force that pulls it forward. Before expansion, the fibers are essentially parallel, and the traction force on the fibers is balanced. When an external force is used to expand the bundle laterally in the width direction, the fibers will inevitably become non-parallel. The greater the lateral displacement, the larger the tilt angle of the fiber bundle, and the longer the path length, resulting in greater tension on the fiber bundle. The magnitude of the lateral displacement of the fibers at different expansion positions varies, as does the tilt angle in the bundle plane, and the tension also varies, thus causing the force on the fibers to become unbalanced after expansion.

[0005] In fact, the traction force on the filament bundle generates a retraction force that causes the broadened fibers to return to their original position. Without path compensation measures, the tension imbalance caused by unequal paths will be stored in the winding filament bundle as internal stress. This stress will be released when the filament bundle is unwound, causing width shrinkage or uneven filament distribution, which affects the quality of the broadened filament bundle. This is a problem that needs to be improved in the current process of expanding the filament bundle. Summary of the Invention

[0006] The purpose of this invention is to provide a carbon fiber bundle width expansion device for equal path spatial displacement conversion, so as to solve the problem of bundle width shrinkage or uneven bundle distribution caused by uneven stress on the fibers during the current process of expanding the bundle.

[0007] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution: A carbon fiber tow width expansion device with equal path spatial displacement conversion includes a tow unwinding device, a heating device, an equal path spatial displacement conversion device section, and a tow winding device arranged sequentially. The equal path spatial displacement conversion device section consists of a first limiting element, an equal path spatial displacement conversion element, and a second limiting element. The equal path spatial displacement conversion element has an equal path spatial displacement conversion curved surface with an inclination angle to the tow width plane. The equal path spatial displacement conversion element is responsible for causing the fibers in the tow to undergo upward and / or width-direction spatial displacement when passing through the equal path spatial displacement conversion curved surface, and ensuring that the upward and / or width-direction spatial displacement of the fibers maintains the same path length. The first limiting element and the second limiting element are respectively located on the front and rear sides of the equal path spatial displacement conversion element. The first limiting element is used to limit the relative horizontal height and distance when the tow width plane enters the equal path spatial displacement conversion element, and the second limiting element is used to limit the relative horizontal height and distance when the tow width plane leaves the equal path spatial displacement conversion element, and to shape the tow, which is in a spatial curved surface state after expansion, into a planar output.

[0008] Furthermore, the unwinding device uses a rotatable unwinding head. Theoretically, the original filament bundle is untwisted, but if there is a deviation and the filament bundle is not parallel, it can be corrected by rotating the unwinding head.

[0009] Furthermore, the equal path spatial displacement conversion element is a drum-shaped wheel that can rotate along an axis. The axis of the drum-shaped wheel is perpendicular to the winding direction of the filament bundle and parallel to the plane of the filament bundle width. The circumferential surface of the drum-shaped wheel is the equal path spatial displacement conversion surface that has an inclination angle with the plane of the filament bundle width.

[0010] Furthermore, the drum-shaped wheel is a single-sided drum-shaped wheel with one end larger than the other, or a double-sided symmetrical drum-shaped wheel with both ends smaller than the middle.

[0011] Furthermore, the equal path spatial displacement conversion element is a curved plate, the entire curved plate being perpendicular to both the yarn winding direction and the yarn width plane, and one side of the curved plate being the equal path spatial displacement conversion surface having an inclination angle with the yarn width plane.

[0012] Furthermore, the curved plate is a single-sided curved plate that is wide at one end and narrow at the other, or a double-sided symmetrical curved plate that is narrow at both ends and wide in the middle.

[0013] Furthermore, both the first limiting element and the second limiting element are rollers or roller pairs, or flat plates with smooth contact ends.

[0014] Furthermore, multiple equal-path spatial displacement conversion device sections are connected in series on the unwinding and winding path of the filament bundle between the unwinding device and the winding device, and the multiple equal-path spatial displacement conversion device sections progressively widen the narrow filament bundle to the required wide filament bundle step by step.

[0015] Furthermore, when multiple equal-path spatial displacement conversion device sections are connected in series, the second limiting element belonging to the previous equal-path spatial displacement conversion device section and the first limiting element belonging to the subsequent equal-path spatial displacement conversion device section are combined into one limiting element for use.

[0016] Furthermore, the equal path spatial displacement conversion device also includes a dynamic fine-tuning device for adjusting the relative position between the equal path spatial displacement conversion element and the first limiting element and the second limiting element. The dynamic fine-tuning device is responsible for influencing the filament broadening effect by adjusting the relative position between the equal path spatial displacement conversion element and the first limiting element and the second limiting element.

[0017] Furthermore, the relative position of the equal path spatial displacement conversion element with respect to the first limiting element and the second limiting element includes the relative horizontal height and distance.

[0018] Furthermore, the equal path spatial displacement conversion device also includes a uniformity detection device. The uniformity detection device is signal-connected to the dynamic fine-tuning device. The uniformity detection device is responsible for detecting the uniformity of the broadened filament bundle and feeding back the detection signal to the dynamic fine-tuning device to provide adjustment basis for the dynamic fine-tuning device.

[0019] Furthermore, the uniformity detection device comprises a light source, a photosensitive sensor, and a signal processor. The light source is disposed on one side of the expanded filament bundle, and the photosensitive sensor is disposed on the other side of the expanded filament bundle. The light source and the photosensitive sensor are vertically aligned across the expanded filament bundle. The photosensitive sensor is signal-connected to the signal processor, and the light source is electrically connected to the signal processor. The signal processor integrates a microprocessor chip (MCU) and is provided with an interface circuit for signal connection with the dynamic fine-tuning device.

[0020] Furthermore, the equal path spatial displacement conversion device section also includes a human-machine interface, which is connected to the signal processor and used to observe the uniformity of the broadened filament bundle and set fine-tuning parameters.

[0021] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention transforms the planar widening motion of the filament bundle into a spatial displacement motion by using an equipath spatial displacement conversion element with an equipath spatial displacement conversion surface that has an inclination angle with the plane of the filament bundle width. This results in each part of the filament bundle having displacement in both the width and height directions, and each part of the filament bundle having the same displacement path length, thus having uniform tension and achieving a better filament bundle widening effect.

[0022] 2. The filament towing device of the present invention is a passive solution, that is, it does not require the application of additional towing force (such as mechanical vibration, ultrasonic waves, airflow, etc.) to the filament towing fibers. Instead, it cleverly converts the traction force of the filament towing and unwinding into a towing displacement force, so it will not damage the filament towing fibers and their surface. It is an energy-saving, environmentally friendly and low-noise filament towing solution.

[0023] 3. The filament broadening device of the present invention is also equipped with a closed-loop detection and fine-tuning device, which can adjust the relative positions of each element in the isopath spatial displacement conversion device section in real time according to the detection signal of the uniformity of the broadened filament, thereby ensuring the uniform distribution of the broadened filament surface and guaranteeing the quality of the broadened filament. It is foreseeable that the technology provided by the present invention will reach the limit of single-filament thin layers.

[0024] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Specific embodiments of the present invention are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structural framework of the present invention; Figure 2 This is a schematic diagram of the main structure of the medium path spatial displacement conversion device section of the present invention; Figure 3 This is a perspective view of the medium-path spatial displacement conversion element of the present invention when it is a single-sided drum-shaped wheel; Figure 4 This is a perspective view of the medium-path spatial displacement conversion element of the present invention when it is a double-sided symmetrical drum-shaped wheel; Figure 5 This is a perspective view of the medium-path spatial displacement conversion element of the present invention when it is a single-sided curved plate. Figure 6 This is a perspective view of the medium-path spatial displacement conversion element of the present invention when it is a double-sided symmetrical curved plate. Figure 7 This is a schematic diagram of the structure of the first embodiment of the medium path spatial displacement conversion device section of the present invention; Figure 8 This is a schematic diagram of the structure of a second embodiment of the medium path spatial displacement conversion device section of the present invention; Figure 9 This is a signal connection diagram of the dynamic fine-tuning device, uniformity detection device, and human-machine interface in the third embodiment of the medium path spatial displacement conversion device section of the present invention. Figure 10 This is a diagram illustrating the principle of equal-path spatial displacement conversion in this invention. Detailed Implementation

[0026] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0027] See Figure 1-2 As shown, a carbon fiber tow width expansion device for equal path spatial displacement conversion includes a tow unwinding device 1, a heating device 2, an equal path spatial displacement conversion device section 3, and a tow winding device 4 arranged sequentially. The equal path spatial displacement conversion device section 3 consists of a first limiting element 301, an equal path spatial displacement conversion element 302, and a second limiting element 303. The equal path spatial displacement conversion element 302 has an equal path spatial displacement conversion surface 304 with an inclination angle to the tow width plane. The equal path spatial displacement conversion element 302 is responsible for causing the fibers in the tow 5 passing through the equal path spatial displacement conversion surface 304 to move upwards and... / or spatial displacement in the width direction, and the upward and / or width direction spatial displacement of the fiber filaments maintains the same path length; the first limiting element 301 and the second limiting element 303 are respectively located on the front and rear sides of the equal path spatial displacement conversion element 302. The first limiting element 301 is used to limit the relative horizontal height and distance when the fiber bundle width plane enters the equal path spatial displacement conversion element 302, and the second limiting element 303 is used to limit the relative horizontal height and distance when the fiber bundle width plane leaves the equal path spatial displacement conversion element 302, and to shape the fiber bundle 5, which is in a spatial curved state after being widened, into a planar output.

[0028] Furthermore, the unwinding device 1 uses a rotatable unwinding head. Theoretically, the original filament bundle is untwisted, but if there is a deviation and the filament bundle is not parallel, it can be corrected by rotating the unwinding head.

[0029] Further, see Figure 3-4As shown, the equal path spatial displacement conversion element 302 is a drum-shaped wheel that can rotate along an axis. The axis of the drum-shaped wheel is perpendicular to the winding direction of the filament bundle and parallel to the plane of the filament bundle width. The circumferential surface of the drum-shaped wheel is the equal path spatial displacement conversion surface 304 that has an inclination angle with the plane of the filament bundle width.

[0030] Further, see Figure 3-4 As shown, the drum-shaped wheel is a single-sided drum-shaped wheel 302a with one end larger than the other, or a double-sided symmetrical drum-shaped wheel 302b with both ends smaller than the middle.

[0031] Further, see Figure 5-6 As shown, the equal path spatial displacement conversion element 302 is a curved plate. The entire curved plate is perpendicular to both the yarn winding direction and the yarn width plane. One side of the curved plate is the equal path spatial displacement conversion surface that has an inclination angle with the yarn width plane.

[0032] Further, see Figure 5-6 As shown, the curved plate is a single-sided curved plate 302c that is wide at one end and narrow at the other, or a double-sided symmetrical curved plate 302d that is narrow at both ends and wide in the middle.

[0033] Further, see Figure 7-8 As shown, the first limiting element 301 and the second limiting element 303 are both rollers or roller pairs 301a, or flat plates 301b with smooth contact ends.

[0034] Further, see Figure 8 As shown, multiple equal path spatial displacement conversion device sections 3 are connected in series on the unwinding and winding path of the filament bundle between the filament bundle unwinding device 1 and the filament bundle winding device 4. The multiple equal path spatial displacement conversion device sections 3 progressively widen the narrow filament bundle to the required wide filament bundle step by step.

[0035] Further, see Figure 8 As shown, when multiple equal-path spatial displacement conversion device sections 3 are connected in series, the second limiting element 303 belonging to the equal-path spatial displacement conversion device section 3 of the previous section and the first limiting element 301 belonging to the equal-path spatial displacement conversion device section 3 of the subsequent section are combined into one limiting element for use.

[0036] Further, see Figure 9As shown, the equal path spatial displacement conversion device section 3 further includes a dynamic fine-tuning device 305 for adjusting the relative position between the equal path spatial displacement conversion element 302 and the first limiting element 301 and the second limiting element 303. The dynamic fine-tuning device 305 is responsible for influencing the filament broadening effect by adjusting the relative position between the equal path spatial displacement conversion element 302 and the first limiting element 301 and the second limiting element 303.

[0037] Furthermore, the relative position of the equal path spatial displacement conversion element 302 with the first limiting element 301 and the second limiting element 303 includes relative horizontal height and distance.

[0038] Further, see Figure 9 As shown, the equal path spatial displacement conversion device section 3 also includes a uniformity detection device 306. The uniformity detection device 306 is connected to the dynamic fine-tuning device 305. The uniformity detection device 306 is responsible for detecting the uniformity of the broadened filament bundle and feeding back the detection signal to the dynamic fine-tuning device 305 to provide the adjustment basis for the dynamic fine-tuning device 305.

[0039] Further, see Figure 9 As shown, the uniformity detection device 306 comprises a light source 3061, a photosensitive sensor 3062, and a signal processor 3063. The light source 3061 is disposed on one side of the expanded filament bundle, and the photosensitive sensor 3062 is disposed on the other side of the expanded filament bundle. The light source 3061 and the photosensitive sensor 3062 are vertically aligned across the expanded filament bundle. The photosensitive sensor 3062 is signal-connected to the signal processor 3063, and the light source 3061 is electrically connected to the signal processor 3063. The signal processor 3063 integrates a microprocessor chip MCU 3064, and the signal processor 3063 is provided with an interface circuit for signal connection with the dynamic fine-tuning device 305.

[0040] Further, see Figure 9 As shown, section 3 of the equal path spatial displacement conversion device also includes a human-machine interface 307, which is connected to the signal processor 3063 and is used to observe the uniformity of the broadened filament bundle and set fine-tuning parameters.

[0041] See Figure 10 As shown, Figure 10This diagram illustrates the principle of equal-path spatial displacement conversion. The equal-path spatial displacement conversion element 302 of this invention enables the fibers in the fiber bundle 5 passing through the equal-path spatial displacement conversion surface 304 to undergo upward and / or width-direction spatial displacement, while maintaining the same path length for both upward and / or width-direction spatial displacements. The equal-path spatial displacement conversion principle employed by the equal-path spatial displacement conversion surface 304 can be achieved through… Figure 10 To explain.

[0042] Figure 10 In the middle: A is the wire with the largest width displacement, but the smallest height displacement, which is the set value; B is the middle wire, with displacement in both the width and height directions; C is the wire with no width displacement, but the largest height displacement. D is the distance between the equipath spatial displacement transformation element 302 and the second limiting element 303, which is the projection of the rear section of wire C onto the reference plane (the reference horizontal plane for calculating the height); since the rear sections of wire A and wire B are parallel, their projection line segments on the reference plane are also parallel and equal. X represents the height displacement of limiting wire A; Y represents the height displacement of limiting wire B; Z represents the height displacement of limiting wire C; E is the projection of the front section of wire C onto the reference plane; F is the projection of the front section of wire B onto the reference plane; G is the projection of the front section of wire A onto the reference plane; it can be seen that due to the widening, projections F and G are non-parallel oblique lines. W is the equipath spatial displacement transformation surface 304 on the equipath spatial displacement transformation element 302. To simplify the analysis, the surface is simplified into a curve. This is the intersection line between the surface and the vertical plane (the section surface that passes through the center line of the surface and is perpendicular to the reference plane). This is an inclined curve. The intersection point of the wire and this curve is the dividing point of the front and back segments of the wire. The front and back segments of the wire are both straight lines. The aforementioned "front section" of the filament refers to the section of the filament bundle located before the equal path spatial displacement transformation element 302, while the "rear section" refers to the section located after the equal path spatial displacement transformation element 302.

[0043] Let the distance between the first limiting element 301 and the equipathic spatial displacement transformation element 302 be d1, and the distance between the second limiting element 303 and the equipathic spatial displacement transformation element 302 be d2. Let the height displacements of wires A, B, and C be h1, h2, and h3, respectively, and the width displacements of wires A, B, and C be x1, x2, and x3, respectively. Let the total length of the wires be m. Define the length of the front section of wire A as m1a and the length of the rear section as m2b. According to the side length relationship of a right triangle, we have: ; Where m is the total length of the filament after spatial displacement. Given d1, d2, x1, and h1, m is a constant according to formulas (1) and (2).

[0044] For a general mi root (where i is a natural number), we have the following formula: ; For the filament C, since x3=0, it is easy to calculate h3 by applying formulas (4) to (6) based on the known value of m: ; Let m3a + m3b = m, that is, keep the total length unchanged, and d1 and d2 are definite constants, then h3 can be solved; Similarly, for any position of wire B or mi between wire A and wire C, mi = m is always true; based on the set lateral displacement x2 or xi of the wire, and the m value calculated based on the maximum width position of wire A, apply formulas (4) to (6) to calculate the corresponding height displacement h2 or hi.

[0045] By iterating through the lateral displacement from the narrow filament bundle to the wide filament bundle by xi, a set of corresponding hi values ​​is obtained, which is the "equal path spatial displacement transformation" curve or the surface obtained from it.

[0046] In engineering applications, the filament bundle may not move along the ideally distributed widening path, and discrepancies will always occur, thus requiring fine-tuning of the position. In addition, the starting height factor of narrow filament bundles is not considered in the formula, and although the value is small, it will also cause differences; differences in the bonding force between filaments due to surface sizing or other reasons will also cause differences; by fine-tuning the position, fluctuating separation force can be generated to overcome the aforementioned differences and achieve a better widening effect.

[0047] Through a series of progressively widening schemes, the later the stage, the smaller the aforementioned differences become, and the closer it is to the theoretical state in the formula. Therefore, through high-precision design and implementation techniques, the ultimate monofilament thin layer can be achieved.

[0048] Based on the above structure and principle, several specific embodiments of the present invention for filament broadening are described in detail below: Example 1

[0049] See Figure 1 , 2 As shown in Figure 7, when an equal path spatial displacement conversion device section 3 is provided on the unwinding and winding path of the filament bundle, the equal path spatial displacement conversion element 302 can be a single-sided drum-shaped wheel 302a with one end larger than the other, and the first limiting element 301 and the second limiting element 303 can both be rollers or roller pairs 301a.

[0050] The narrow filament bundle fed by the filament bundle unwinding device 1 is heated by the heating device 2 and then passes through the front roller or roller pair 301a. The roller or roller pair 301a limits the relative horizontal height and distance of the filament bundle width plane when it enters the single-sided drum roller 302a, so that the narrow filament bundle becomes a widened filament bundle that meets the requirements. Then the widened filament bundle enters the single-sided drum roller 302a and passes on the equal path spatial displacement transformation surface 304 of the single-sided drum roller 302a, causing the fiber strands in the widened filament bundle to move upward and / or in the width direction. Spatial displacement, ensuring that the upward and / or width-direction spatial displacement of the fiber filaments maintains the same path length, thereby ensuring that the tension on each fiber filament in the broadened bundle is balanced and consistent. Finally, the broadened bundle passes through the rear roller or roller pair 301a, which limits the relative horizontal height and distance of the bundle width plane away from the single-sided drum roller 302a, and shapes the broadened bundle, which is in a spatial curved state, into a planar output, thereby ultimately achieving a better bundle broadening effect. Example 2

[0051] See Figure 1 , 2 As shown in Figure 8, when two equal path spatial displacement conversion device sections 3 are provided on the unwinding and winding path of the filament bundle, the equal path spatial displacement conversion element 302 located in the first section can be a single-sided curved plate 302c that is wide at one end and narrow at the other end, and the equal path spatial displacement conversion element 302 located in the second section can be a double-sided symmetrical curved plate 302d that is narrow at both ends and wide in the middle. The first limiting element 301 and the second limiting element 303 are both flat plates 301b with smooth contact ends, and the second limiting element 303 in the first equal path spatial displacement conversion device section 3 and the first limiting element 301 in the second equal path spatial displacement conversion device section 3 are the same flat plate 301b with smooth contact ends.

[0052] The narrow filament bundle fed by the filament bundle unwinding device 1 is heated by the heating device 2 and then passes through the front flat plate 301b. The flat plate 301b limits the relative horizontal height and distance of the filament bundle width plane when it enters the previous single-sided curved plate 302c, so that the narrow filament bundle becomes a primary stage of broadened filament bundle. Then, the primary stage broadened filament bundle enters the previous single-sided curved plate 302c and passes on the equipath spatial displacement transformation surface 304 of the single-sided curved plate 302c, so that the primary stage broadened filament bundle... The fiber filaments undergo upward and / or width-direction spatial displacement, ensuring that the upward and / or width-direction spatial displacements of the fiber filaments maintain the same path length. This ensures that the tension on each fiber filament in the initial stage of the broadened bundle is balanced and consistent. The initial stage broadened bundle then passes through the intermediate flat plate 301b. This flat plate 301b limits the relative horizontal height and distance of the bundle width plane when it leaves the previous single-sided curved plate 302c, and also limits the relative horizontal height and distance when the bundle width plane enters the subsequent double-sided symmetrical curved plate 302d. This further transforms the initial stage broadened bundle into a compliant broadened bundle. The compliant broadened bundle then enters the subsequent double-sided symmetrical curved plate 302d and passes through the equal-path spatial displacement transformation surface 304 of the double-sided symmetrical curved plate 302d. This causes the fiber filaments in the compliant broadened bundle to undergo upward and / or width-direction spatial displacement, ensuring that the upward and / or width-direction spatial displacements of the fiber filaments are balanced and consistent. The spatial displacement in the width direction maintains the same path length, thereby ensuring that the tension on each fiber strand in the required broadened filament bundle is balanced and consistent. Finally, the required broadened filament bundle passes through the rear flat plate 301b. The flat plate 301b limits the relative horizontal height and distance when the filament bundle width plane leaves the rear double-sided symmetrical curved plate 302d, and shapes the required broadened filament bundle, which is in a spatial curved state after broadening, into a planar output, thereby ultimately achieving a better filament broadening effect. Example 3

[0053] See Figure 9As shown, based on Embodiment 1 or Embodiment 2, additional components such as a dynamic fine-tuning device 305, a uniformity detection device 306, and a human-machine interface 307 can be added. The uniformity detection device 306 mainly consists of a light source 3061, a photosensitive sensor 3062, and a signal processor 3063. The light source 3061 is positioned on one side of the expanded filament bundle, and the photosensitive sensor 3062 is positioned on the other side, such that the light source 3061 and the photosensitive sensor 3062 are vertically aligned across the expanded filament bundle. The signal processor 3063 integrates a microprocessor chip MCU 3064. The signal processor 3063 is signal-connected to the photosensitive sensor 3062 and electrically connected to the light source 3061. The signal processor 3063 also has an interface circuit for connecting to the dynamic fine-tuning device 305 and the human-machine interface 307. The dynamic fine-tuning device 305 and the human-machine interface 307 are connected to the microprocessor chip MCU 3064 within the signal processor 3063 through this interface circuit.

[0054] The operator can set the parameters for the desired filament widening through the human-machine interface 307. Then, the uniformity detection device 306 uses light from the light source 3061 to penetrate the widened filament and illuminate the photosensitive sensor 3062 to detect the uniformity of the widened filament. The photosensitive sensor 3062 feeds back the detection signal to the signal processor 3063. The signal processor 3063 processes and analyzes the detection signal to determine whether the relative position of the isopath spatial displacement conversion element 302 needs to be adjusted. At the same time, the signal processor 3063 also displays the processed and analyzed filament widening uniformity data on the human-machine interface 307. If the signal processor 3063 determines that the filament widening effect needs to be adjusted, it sends a control signal to the dynamic fine-tuning device 305. The dynamic fine-tuning device 305 adjusts the relative horizontal height and distance between the isopath spatial displacement conversion element 302 and the first limiting element 301 and the second limiting element 303, thereby adjusting the filament widening effect.

[0055] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A carbon fiber bundle width expansion device for equal-path spatial displacement conversion, characterized in that: The device includes a filament unwinding device (1), a heating device (2), an equal path spatial displacement conversion device section (3), and a filament winding device (4) arranged sequentially. The filament unwinding device (1) has a rotatable unwinding head for correcting any non-parallel filaments that may exist in the original filament bundle. The equal path spatial displacement conversion device section (3) consists of a first limiting element (301), an equal path spatial displacement conversion element (302), and a second limiting element (303). The equal path spatial displacement conversion element (302) has an equal path spatial displacement conversion surface (304) that has an inclination angle with the filament bundle width plane. The equal path spatial displacement conversion element (302) is responsible for guiding the filament bundle (5) through the equal path spatial displacement conversion surface (304). The fiber filaments in the process generate upward and / or width-direction spatial displacement, and the upward and / or width-direction spatial displacement of the fiber filaments maintains the same path length; the first limiting element (301) and the second limiting element (303) are respectively located on the front and rear sides of the equal path spatial displacement conversion element (302). The first limiting element (301) is used to limit the relative horizontal height and distance when the fiber bundle width plane enters the equal path spatial displacement conversion element (302), and the second limiting element (303) is used to limit the relative horizontal height and distance when the fiber bundle width plane leaves the equal path spatial displacement conversion element (302), and shape the fiber bundle (5) which is in a spatial curved state after being widened into a planar output.

2. The carbon fiber tow width extension device according to claim 1, characterized in that: The equal path spatial displacement conversion element (302) is a drum-shaped wheel that can rotate along an axis. The axis of the drum-shaped wheel is perpendicular to the winding direction of the filament bundle and parallel to the filament bundle width plane. The circumferential surface of the drum-shaped wheel is the equal path spatial displacement conversion surface (304) that has an inclination angle with the filament bundle width plane.

3. The carbon fiber tow width expansion device according to claim 2, characterized in that: The drum-shaped wheel is a single-sided drum-shaped wheel with one end larger than the other (302a), or a double-sided symmetrical drum-shaped wheel with both ends smaller than the middle (302b).

4. The carbon fiber tow width expansion device according to claim 1, characterized in that: The equal path spatial displacement conversion element (302) is a curved plate. The entire curved plate is perpendicular to both the yarn winding direction and the yarn width plane. One side of the curved plate is the equal path spatial displacement conversion surface that has an inclination angle with the yarn width plane.

5. The carbon fiber tow width extension device according to claim 4, characterized in that: The curved plate is a single-sided curved plate (302c) that is wide at one end and narrow at the other, or a double-sided symmetrical curved plate (302d) that is narrow at both ends and wide in the middle.

6. The carbon fiber tow width expansion device according to claim 1, characterized in that: The first limiting element (301) and the second limiting element (303) are both rollers or roller pairs (301a), or flat plates (301b) with smooth contact ends.

7. The carbon fiber tow width extension device according to any one of claims 1-6, characterized in that: Multiple equal path spatial displacement conversion device sections (3) are connected in series on the unwinding and winding path of the filament bundle between the unwinding device (1) and the winding device (4). The multiple equal path spatial displacement conversion device sections (3) progressively widen the narrow filament bundle to the required wide filament bundle step by step. When multiple equal path spatial displacement conversion device sections (3) are connected in series, the second limiting element (303) in the previous equal path spatial displacement conversion device section (3) and the first limiting element (301) in the next equal path spatial displacement conversion device section (3) are combined into one limiting element for use.

8. The carbon fiber tow width extension device according to claim 1, characterized in that: The equal path spatial displacement conversion device section (3) further includes a dynamic fine-tuning device (305) for adjusting the relative position between the equal path spatial displacement conversion element (302) and the first limiting element (301) and the second limiting element (303). The dynamic fine-tuning device (305) is responsible for influencing the filament broadening effect by adjusting the relative position between the equal path spatial displacement conversion element (302) and the first limiting element (301) and the second limiting element (303). The relative position includes relative horizontal height and distance.

9. The carbon fiber tow width extension device according to claim 8, characterized in that: The equal path spatial displacement conversion device section (3) also includes a uniformity detection device (306). The uniformity detection device (306) is connected to the dynamic fine-tuning device (305) by signal. The uniformity detection device (306) is responsible for detecting the uniformity of the broadened filament bundle and feeding back the detection signal to the dynamic fine-tuning device (305) to provide adjustment basis for the dynamic fine-tuning device (305).

10. The carbon fiber tow width extension device according to claim 9, characterized in that: The uniformity detection device (306) consists of a light source (3061), a photosensitive sensor (3062), and a signal processor (3063). The light source (3061) is disposed on one side of the broadened filament bundle, and the photosensitive sensor (3062) is disposed on the other side of the broadened filament bundle. The light source (3061) and the photosensitive sensor (3062) are vertically aligned across the broadened filament bundle. The photosensitive sensor (3062) is signal-connected to the signal processor (3063), and the light source (3061) is electrically connected to the signal processor (3063). The signal processor (3063) integrates a microprocessor chip (MCU) (3064), and the signal processor (3063) is provided with an interface circuit for signal connection with the dynamic fine-tuning device (305).

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