A production device of 35-50K carbon fiber plate

Abstract

The application discloses a kind of 35-50K carbon fiber plate production equipment, including creel and be arranged on creel several yarn cans, several The yarn cans are arrayed, array includes several array layers, array layer is sequentially numbered from center by inside to outside as N, N+1 ……N+n layer, at least there is the spacing between adjacent yarn cans of N+n-a layer is greater than the spacing between adjacent yarn cans of N+n-b layer, wherein a, b are all greater than or equal to 0, and a<b. Carbon fiber plate is produced using 35-50K carbon fiber, reduces the use number of carbon fiber, reduces the production cost of carbon fiber plate, and then reduces the cost of preparing wind power blade using carbon fiber plate;The carbon fiber of the application is well impregnated and fully impregnated, and the plate made of the carbon fiber has uniform and stable mechanical properties, the tensile strength of the plate is greater than or equal to 1400Mpa, and the tensile modulus is greater than or equal to 130Gpa, which meets the use requirements of carbon fiber plate for hundred-meter wind power blade, and can be applied to the technical field of wind power blade.

Description

Technical Field

[0001] This invention belongs to the technical field of processing and manufacturing wind turbine blades using large-tow carbon fiber, specifically, it relates to a production equipment for 35-50K carbon fiber sheets. Background Technology

[0002] As wind power-related technologies continue to upgrade, wind turbine blades are becoming increasingly longer, making their manufacturing more challenging. How to reduce the weight of wind turbine blades while maintaining high strength, and simultaneously lower production costs, has become a pressing technical problem to be solved.

[0003] To address the aforementioned issues, carbon fiber composites, with their superior characteristics such as high strength, high modulus, and high fatigue resistance, are currently suitable for manufacturing wind turbine blades. The process involves: separating carbon fiber yarns, bundling them, heating them, impregnating them with resin, preforming them, curing them, post-curing them, cutting them, and winding them to obtain carbon fiber sheets. The carbon fibers used are mostly small-tow carbon fibers below 25K. Taking 25K carbon fiber as an example, the fabrication of wind turbine blades requires a large quantity of 25K carbon fiber yarns, with each yarn consisting of approximately 25,000 carbon fiber filaments bundled together.

[0004] In the aforementioned production process, to ensure high strength of wind turbine blades, a large number of small-tow carbon fiber yarns are often required to produce blades that meet strength requirements. However, due to the large quantity of carbon fibers, carbon fiber management during production is challenging. Bundling these large amounts of carbon fiber yarns is difficult, resulting in poor uniformity of the bundles and inconsistent impregnation, sometimes even leading to insufficient impregnation. This results in poor mechanical properties and uniformity of the produced carbon fiber sheets. Furthermore, the use of a large amount of carbon fiber yarn in the manufacture of wind turbine blades leads to higher production costs.

[0005] In view of this, the present invention is hereby proposed. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a production equipment for 35-50K carbon fiber sheets, so as to achieve the purpose of producing carbon fiber sheets with excellent mechanical properties, high production efficiency and low production cost using the equipment, and the wind turbine blades made from the carbon fiber sheets have excellent mechanical properties, light weight and low production cost.

[0007] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0008] A production equipment for 35-50K carbon fiber sheets includes a yarn frame and a plurality of yarn bobbins arranged on the yarn frame. The plurality of yarn bobbins are arranged in an array, and the array includes a plurality of array layers. The array layers are sequentially labeled as layers N, N+1, ..., N+n from the center outwards. At least there exists a spacing between adjacent yarn bobbins in layer N+na that is greater than the spacing between adjacent yarn bobbins in layer N+nb, where a and b are both greater than or equal to 0, and a < b < N+n.

[0009] This invention uses 35-50K large-tow carbon fiber to produce carbon fiber sheets, which reduces the number of carbon fiber yarns used, lowers the production cost of carbon fiber sheets, and further reduces the cost of using carbon fiber sheets to manufacture wind turbine blades.

[0010] In this invention, the spacing between adjacent yarn bobbins in the N+na layer is greater than the spacing between adjacent yarn bobbins in the N+nb layer. That is, the spacing between adjacent yarn bobbins in the outer layer is larger, while the spacing between adjacent yarn bobbins in the inner layer is smaller. This makes it less likely for the carbon fiber yarns drawn from the yarn bobbins on the yarn frame to cross or misalign during the traction and extrusion process to form the board. This results in good uniformity of the carbon fiber yarn bundles formed from the carbon fiber yarns. The uniformity of the carbon fiber yarn bundles after impregnation is also good. Furthermore, the mechanical properties of the carbon fiber board made from the carbon fiber yarn bundles with good uniformity are uniform and stable.

[0011] Furthermore, the array layer includes several horizontal array layers and several vertical array layers.

[0012] Several horizontal array layers are sequentially designated as the Nth layer from the center outwards. 横 N 横 +1……N 横 +n layers, at least the Nth layer exists. 横 The spacing between adjacent yarn bobbins in layer +na is greater than that of the Nth layer. 横 The spacing between adjacent yarn bobbins in the +nb layer;

[0013] Alternatively, several vertical array layers can be sequentially designated as the Nth layer from the center outwards. 纵 N 纵 +1……N 纵 +n layers, at least the Nth layer exists. 纵 The spacing between adjacent yarn bobbins in layer +na is greater than that of the Nth layer. 纵 The spacing between adjacent yarn bobbins in the +nb layer.

[0014] Furthermore, in a plurality of horizontal array layers, the spacing between adjacent horizontal array layers from the center outwards is denoted as the Lth spacing. 横 L 横 +1……L 横 +n intervals, at least the Lth interval exists 横+na spacing is greater than Lth 横 +nb spacing;

[0015] Alternatively, in a plurality of vertical array layers, the spacing between adjacent vertical array layers from the center outwards is denoted as Lth. 纵 L 纵 +1……L 纵 +n intervals, at least the Lth interval exists 纵 +na spacing is greater than Lth 纵 +nb spacing.

[0016] Preferably, the yarn frame has mounting positions for mounting a plurality of the yarn bobbins, the Nth... 纵 +na layer yarn bobbins are arranged with one bobbin every 2-3 installation positions, Nth layer 纵 +nb layer yarn bobbins are arranged with one yarn bobbin every 1-2 installation positions.

[0017] Preferably, the Nth 纵 +na layer yarn tube and Nth 纵 +nb layer of yarn bobbins are arranged in a staggered manner.

[0018] In this invention, the Nth 纵 +na layer yarn tube and Nth 纵 The staggered arrangement of the +nb layer yarn bobbins avoids the cross-dislocation of yarns during traction, resulting in good uniformity of the carbon fiber yarn bundle. During impregnation, the adhesive can fully penetrate between the yarns, ensuring uniform impregnation.

[0019] Furthermore, it also includes an impregnation device arranged sequentially with the yarn frame, and a number of yarn feeders are arranged between the impregnation device and the yarn frame. The yarn feeders are arranged longitudinally in sequence, and the yarn feeders are provided with a number of transversely arranged ceramic eyes for the yarn to pass through. The yarn is drawn from the yarn bobbin to the ceramic eyes.

[0020] In this invention, several yarn-making devices are arranged longitudinally between the yarn frame and the impregnation device. The carbon fiber yarn is drawn through the transversely arranged ceramic eyelets on the yarn-making devices, which increases the width of the carbon fiber yarn in the transverse direction and uniformly layers the carbon fiber yarn in the longitudinal direction. This allows the carbon fiber yarn to be drawn to the impregnation device for impregnation in a certain width and multi-layer arrangement, and further allows the adhesive to be fully dispersed between the carbon fiber yarns, ensuring the sufficiency and uniformity of the impregnation.

[0021] Furthermore, the plurality of yarn bobbins include an uppermost yarn bobbin and a lowermost yarn bobbin, wherein the yarn of the uppermost yarn bobbin passes through an upper yarn-making device, and the yarn of the lowermost yarn bobbin passes through a lower yarn-making device, and the distance from the uppermost yarn bobbin to the upper yarn-making device is less than the distance from the lowermost yarn bobbin to the lower yarn-making device.

[0022] This setup allows the carbon fiber yarns drawn from the upper and lower yarn bobbins to enter the impregnation device simultaneously, ensuring the synchronization of impregnation during the production of carbon fiber sheets. This results in uniform and stable mechanical properties of the carbon fiber sheets obtained after preforming, curing, post-curing, and traction.

[0023] Furthermore, the porcelain eyelets on the yarn-drying device are arranged in transverse layers;

[0024] Preferably, the porcelain eyelets in adjacent layers are arranged in a staggered manner;

[0025] Preferably, the ceramic eyelets on adjacent yarn-weaving devices are arranged in a staggered manner;

[0026] Preferably, each row of the yarn feeder has 10-20 porcelain eyelets.

[0027] In this invention, several ceramic eyelets on the yarn-making device are arranged in transverse layers, so that the carbon fiber yarns drawn out by each yarn-making device can be layered, and the adhesive can be fully dispersed between the layers of the carbon fiber yarns.

[0028] The staggered arrangement of ceramic eyes on adjacent yarn feeders ensures that the spacing between adjacent carbon fiber yarns is equal, which in turn ensures that the amount of adhesive between adjacent carbon fiber yarn bundles is basically equal, thus guaranteeing the uniformity of the adhesive impregnation.

[0029] Furthermore, the impregnation apparatus includes:

[0030] Dipping tank,

[0031] The layerer is located above the wall of the impregnation tank and is formed by several longitudinally spaced guide rollers. The yarn drawn out by the yarn frame passes through the guide rollers to be layered and impregnated in the impregnation tank.

[0032] In this invention, a layering device is provided in the impregnation tank, which allows the carbon fiber yarn drawn into the impregnation tank to fully contact the adhesive in the impregnation tank under the layering action of the layering device, thus ensuring sufficient impregnation.

[0033] Furthermore, the impregnation tank includes a yarn inlet end and a yarn outlet end, and the separator includes an impregnation separator and an extrusion separator. The impregnation separator is disposed between the yarn inlet end and the yarn outlet end, and the extrusion separator is positioned higher than the impregnation separator at the yarn outlet end.

[0034] Preferably, the spacing between adjacent guide rollers of the dip-dipping separator is greater than the spacing between adjacent guide rollers of the extrusion separator.

[0035] The impregnation layerer of the present invention is set between the yarn inlet end and the yarn outlet end. The carbon fiber yarn is drawn onto the impregnation layerer. Under the layering and positioning action of the impregnation layerer, it can fully contact the adhesive liquid, avoiding the phenomenon that the carbon fiber yarns are stacked together or float out of the adhesive liquid, resulting in poor impregnation effect.

[0036] The extrusion separator of the present invention is positioned higher than the impregnation separator at the yarn exit end. When the carbon fiber yarn is pulled to the yarn exit end, it is squeezed by the guide roller of the impregnation separator, which squeezes the excess glue on the carbon fiber yarn back into the impregnation tank. This avoids waste of glue and ensures that the carbon fiber yarn has an appropriate amount and uniform distribution of glue, thus guaranteeing the uniformity and stability of the impregnated carbon fiber yarn.

[0037] In this invention, the spacing between adjacent guide rollers of the impregnation layerer is relatively large to ensure that there is sufficient adhesive between the guide rollers, thereby ensuring sufficient impregnation; the spacing between adjacent guide rollers of the extrusion layerer is relatively small to ensure that all excess adhesive on the impregnated carbon fiber yarn can be squeezed out.

[0038] Preferably, the impregnation tank is a V-shaped groove, and the impregnation layerer is located above the lowest point of the V-shaped groove.

[0039] The impregnation tank is a V-shaped groove, which makes the adhesive depth at the lowest point of the V-shaped groove relatively deep. By setting an impregnation layerer above the lowest point of the V-shaped groove, the carbon fiber yarn can be fully impregnated in the area with a deeper adhesive depth, making full and reasonable use of the adhesive. The purpose of fully impregnating the carbon fiber yarn can be achieved without using a large amount of adhesive.

[0040] Preferably, the slope of the side wall at the yarn inlet end of the impregnation tank is greater than the slope of the side wall at the yarn outlet end.

[0041] In this invention, the slope of the side wall at the yarn inlet of the impregnation tank is relatively large, which allows the carbon fiber yarn to be drawn to the bottom of the impregnation tank for impregnation in a shorter time and at a faster speed, ensuring a faster impregnation rate; the slope of the side wall at the yarn outlet of the impregnation tank is relatively small, which makes it difficult for the adhesive on the carbon fiber yarn to flow downwards along the yarn when the carbon fiber yarn is pulled out from the yarn outlet, further ensuring the stability of the adhesive on the yarn after impregnation.

[0042] Furthermore, the production equipment also includes a curing device arranged sequentially with the yarn frame and the impregnation device. The curing device includes:

[0043] The solidification mold has a yarn inlet end and a yarn outlet end.

[0044] A heater is provided on the curing mold and located on the yarn inlet side of the curing mold.

[0045] The present invention provides a heater that is positioned on the curing mold and located at the yarn inlet end of the curing mold, so that the large tow carbon fiber yarn entering the curing mold can be fully heated, thus ensuring sufficient curing.

[0046] The present invention also provides a production process for 35-50K carbon fiber sheets, which is used to produce carbon fiber sheets using 35-50K carbon fiber.

[0047] The production process of this invention uses any of the production equipment described in the above technical solutions to produce 35-50K carbon fiber sheets.

[0048] The production process includes:

[0049] S1. Several carbon fiber yarns are drawn out from several yarn bobbins on the yarn frame. The several carbon fiber yarns are distributed in an array. The array includes several array layers. The array layers are numbered N, N+1...N+n from the center outwards. There is at least one layer where the spacing between adjacent yarns in the N+na layer is greater than the spacing between adjacent yarns in the N+nb layer, where a and b are both greater than or equal to 0, and a < b.

[0050] S2. The drawn carbon fiber yarn is heated, impregnated, pre-formed, cured, post-cured, and drawn to obtain carbon fiber sheet.

[0051] This invention uses 35-50K large-tow carbon fiber to produce carbon fiber sheets, which reduces the number of carbon fiber yarns used, lowers the production cost of carbon fiber sheets, and further reduces the cost of using carbon fiber sheets to manufacture wind turbine blades.

[0052] In this invention, the spacing between adjacent yarns in the N+na layer is greater than the spacing between adjacent yarns in the N+nb layer. That is, the spacing between adjacent yarns in the outer layer is larger, while the spacing between adjacent yarns in the inner layer is smaller. This makes it less likely for the carbon fiber yarns drawn from the yarn bobbins on the yarn frame to cross or misalign during heating, impregnation, preforming, curing, post-curing, and traction processes. This ensures the stability of the heating, impregnation, forming, and curing processes, resulting in good uniformity of the carbon fiber yarn bundles formed from the carbon fiber yarns. Furthermore, this makes the carbon fiber boards made from the carbon fiber yarn bundles with good uniformity have uniform and stable mechanical properties.

[0053] Furthermore, in step S1, the array layer includes several horizontal array layers and several vertical array layers.

[0054] Several horizontal array layers are sequentially designated as the Nth layer from the center outwards. 横 N 横 +1……N 横 +n layers, at least the Nth layer exists. 横The spacing between adjacent yarns in layer +na is greater than that of layer N. 横 The spacing between adjacent yarns in the +nb layer;

[0055] Alternatively, several vertical array layers can be sequentially designated as the Nth layer from the center outwards. 纵 N 纵 +1……N 纵 +n layers, at least the Nth layer exists. 纵 The spacing between adjacent yarns in layer +na is greater than that of layer N. 纵 The spacing between adjacent yarns in the +nb layer.

[0056] Furthermore, in step S1,

[0057] In a series of horizontal array layers, the spacing between adjacent horizontal array layers from the center outwards is denoted as Lth. 横 L 横 +1……L 横 +n intervals, at least the Lth interval exists 横 +na spacing is greater than Lth 横 +nb spacing;

[0058] Alternatively, in a plurality of vertical array layers, the spacing between adjacent vertical array layers from the center outwards is denoted as Lth. 纵 L 纵 +1……L 纵 +n intervals, at least the Lth interval exists 纵 +na spacing is greater than Lth 纵 +nb spacing.

[0059] Further, step S2 includes:

[0060] S21. Bundle the pulled-out yarns in groups of 1-3 strands each;

[0061] S22. The bundled yarns are heated, impregnated with resin, pre-formed, cured, and drawn to obtain carbon fiber sheets.

[0062] In this invention, the pulled yarns are bundled in groups of 1-3 strands each, so that the carbon fiber yarn bundles can be fully impregnated with resin.

[0063] Further, step S22 includes:

[0064] S221. Heat the bundled yarns, and after heating, layer the yarns longitudinally and arrange them laterally.

[0065] S222. The yarn is then drawn into the impregnation tank for impregnation, and pre-formed, cured and drawn to obtain carbon fiber sheet.

[0066] Preferably, the longitudinal layering includes: dividing the yarn longitudinally into 4-8 layers;

[0067] Preferably, the lateral arrangement includes: drawing the yarn through a yarn feeder with 10-20 ceramic eyelets.

[0068] In this invention, the carbon fiber yarn is widened in the transverse direction and uniformly layered in the longitudinal direction, so that the carbon fiber yarn can be drawn to the impregnation device for impregnation in a certain widening and multi-layer arrangement, and the adhesive can be fully dispersed between the carbon fiber yarns, ensuring the sufficiency and uniformity of impregnation.

[0069] Furthermore, the impregnation tank contains a separator, which is formed by several longitudinally spaced guide rollers.

[0070] Step S222 includes: drawing the longitudinally layered yarns onto longitudinally spaced guide rollers and impregnating them with adhesive, then preforming, curing, and drawing them to obtain carbon fiber sheets.

[0071] Furthermore, the impregnation tank includes a yarn inlet end and a yarn outlet end, and the separator includes an impregnation separator and an extrusion separator. The impregnation separator is disposed between the yarn inlet end and the yarn outlet end, and the extrusion separator is positioned higher than the impregnation separator at the yarn outlet end.

[0072] Step S222 includes:

[0073] S2221 first pulls the longitudinally layered yarn onto the guide roller of the sizing separator and impregnates it with sizing;

[0074] S2222 then draws the yarn onto the guide roller of the extrusion layerer for extrusion. After extrusion, it undergoes pre-forming, curing, and drawing to obtain carbon fiber sheets.

[0075] In this invention, carbon fiber yarns are drawn onto the impregnation layerer. Under the layering and positioning action of the impregnation layerer, they can fully contact the adhesive liquid, avoiding the phenomenon that the carbon fiber yarns are stacked together or float out of the adhesive liquid, resulting in poor impregnation effect.

[0076] In this invention, when the carbon fiber yarn is drawn to the yarn exit end, it is squeezed by the guide roller of the impregnation layerer, which squeezes the excess adhesive on the carbon fiber yarn back into the impregnation tank. On the one hand, this avoids the waste of adhesive, and on the other hand, it ensures that the carbon fiber yarn has an appropriate amount and uniform distribution of adhesive, thus guaranteeing the uniformity and stability of the impregnated carbon fiber yarn.

[0077] Furthermore, the spacing between adjacent yarn layers in step S2221 is greater than the spacing between adjacent yarn layers in step S2222.

[0078] In this invention, the spacing between adjacent guide rollers of the impregnation layerer is relatively large to ensure that there is sufficient adhesive between the guide rollers, thereby ensuring sufficient impregnation; the spacing between adjacent guide rollers of the extrusion layerer is relatively small to ensure that all excess adhesive on the impregnated carbon fiber yarn can be squeezed out.

[0079] Preferably, in step S2221, the layered yarn is drawn from below the guide roller to the guide roller and then pulled away from the guide roller from below the guide roller; in this way, the layered yarn will be positioned below the corresponding guide roller, avoiding the yarn from floating on the liquid surface and reducing the impregnation effect.

[0080] Preferably, in step S2222, the yarn is drawn from above the guide roller to the guide roller and then pulled away from the guide roller; this allows the impregnated carbon fiber yarn to be stuck between adjacent guide rollers, so as to ensure that all excess adhesive on the impregnated carbon fiber yarn can be squeezed out.

[0081] Preferably, in step S2221, the yarn is inclined downward from the yarn inlet end of the impregnation tank to the guide roller of the impregnation layerer and impregnated with glue. In step S2222, the yarn is inclined upward from the bottom of the impregnation tank to the yarn outlet end of the impregnation tank and to the guide roller of the extrusion layerer.

[0082] In this invention, the yarn is inclined downward from the yarn inlet end of the impregnation tank to the guide roller of the impregnation layerer to achieve full impregnation; the yarn is inclined upward from the bottom of the impregnation tank to the yarn outlet end to the guide roller of the extrusion layerer to facilitate the extrusion of the adhesive from the impregnated yarn.

[0083] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0084] This invention uses 35-50K large-tow carbon fiber to produce carbon fiber sheets, which reduces the number of carbon fiber yarns used, lowers the production cost of carbon fiber sheets, and further reduces the cost of using carbon fiber sheets to manufacture wind turbine blades.

[0085] In this invention, the spacing between adjacent yarns in the N+na layer is greater than the spacing between adjacent yarns in the N+nb layer. That is, the spacing between adjacent yarns in the outer layer is larger, while the spacing between adjacent yarns in the inner layer is smaller. This makes it less likely for the carbon fiber yarns drawn from the yarn bobbins on the yarn frame to cross or misalign during heating, impregnation, preforming, curing, post-curing, and traction processes. This ensures the stability of the heating, impregnation, forming, and curing processes, resulting in good uniformity of the carbon fiber yarn bundles formed from the carbon fiber yarns. Furthermore, this makes the carbon fiber boards made from the carbon fiber yarn bundles with good uniformity have uniform and stable mechanical properties.

[0086] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0087] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0088] Figure 1 This is a schematic diagram of the assembly structure of the carbon fiber sheet production equipment of the present invention;

[0089] Figure 2 This is a schematic diagram of the assembly structure of the yarn feeder in the carbon fiber sheet production equipment of the present invention;

[0090] Figure 3 This is a schematic diagram of one arrangement of the yarn bobbins according to the present invention;

[0091] Figure 4 This is a schematic diagram of another arrangement of the yarn bobbins according to the present invention.

[0092] In the picture:

[0093] 1. Yarn frame; 11. Yarn bobbin; 12. Mounting position; 13. First horizontal layer; 14. Second horizontal layer; 15. Third horizontal layer; 16. First spacing; 17. Second spacing; 18. Third spacing; 2. Heating device; 3. Pre-forming device; 4. Curing device; 41. Curing mold; 42. Heater; 5. Post-curing device; 6. Traction device; 7. Cutting device; 8. Winding device; 9. Yarn applicator; 91. Ceramic eye; 10. Carbon fiber yarn; 101. Impregnation tank; 1011. Side wall of yarn inlet end of impregnation tank; 1012. Side wall of yarn outlet end of impregnation tank; 102. Impregnation separator; 103. Extrusion separator; 104. Liquid surface; 105. Automatic glue dispensing machine.

[0094] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0095] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0096] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0097] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through a central medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0098] Example 1

[0099] like Figures 1 to 4 As shown in the figure, this embodiment discloses a production equipment for 35-50K carbon fiber sheets. The production equipment includes a yarn rack 1, a heating device 2, a resin impregnation device, a preforming device 3, a curing device 4, and a traction device 6 arranged in sequence.

[0100] A plurality of yarn bobbins 11 are arranged on the yarn frame 1. Each yarn bobbin 11 is a hollow cylinder used for winding yarn. A plurality of circumferentially arranged groove structures can be formed on the outer peripheral sidewall of the yarn bobbin 11. The groove structures have interlocking teeth. The plurality of yarn bobbins 11 are arranged in an array, which includes a plurality of array layers. The array layers are numbered N, N+1...N+n from the center outwards. At least there exists a distance between adjacent yarn bobbins in the N+na layer that is greater than the distance between adjacent yarn bobbins in the N+nb layer, where a and b are both greater than or equal to 0, and a < b.

[0101] In this invention, the yarn bobbins 11 can be arranged in rectangular or irregular arrays; the irregular arrays include trapezoidal, circular, and triangular shapes. Specifically, different yarn bobbin 11 arrangements can be selected according to the actual needs of the carbon fiber sheets to be produced; for example, if it is necessary to produce carbon fiber sheets with a circular cross-section, a circular array of yarn bobbins can be selected. In this method, the corresponding distribution array is rationally selected according to the different shapes of the sheets, so that sheets of different shapes can achieve the ideal mechanical performance requirements.

[0102] In this invention, several carbon fiber yarns 10 are drawn from several yarn bobbins 11 on a yarn frame 1. The drawn carbon fiber yarns 10 are heated by a heating device 2, impregnated by a resin-impregnating device, pre-formed by a pre-forming device 3, cured by a curing device 4, post-cured by a post-curing device 5, and drawn by a traction device 6 to obtain a carbon fiber sheet. The carbon fiber sheet can be cut by a cutting device 7 and wound by a winding device 8 to obtain the carbon fiber sheet product. The heating device 2 includes a frequency generator, the traction device 6 includes a traction machine, the cutting device 7 includes a cutting machine, and the winding device 8 includes a winding machine.

[0103] This invention uses 35-50K large-tow carbon fiber to produce carbon fiber sheets, which reduces the number of carbon fiber yarns used, lowers the production cost of carbon fiber sheets, and further reduces the cost of using carbon fiber sheets to manufacture wind turbine blades.

[0104] In this invention, the spacing between adjacent yarn bobbins 11 in the N+na layer is greater than the spacing between adjacent yarn bobbins 11 in the N+nb layer. That is, the spacing between adjacent yarn bobbins 11 in the outer layer is larger, while the spacing between adjacent yarn bobbins 11 in the inner layer is smaller. In this way, the carbon fiber yarns 10 drawn from the yarn bobbins 11 on the yarn frame 1 are less likely to cross or misalign during the traction and extrusion process to form the board. This results in good uniformity of the carbon fiber yarn bundle formed by the carbon fiber yarns 10. The uniformity of the carbon fiber yarn bundle after impregnation is also good. Furthermore, the mechanical properties of the carbon fiber board made from the carbon fiber yarn bundle with good uniformity are uniform and stable.

[0105] As one embodiment of this invention, the array layer includes several horizontal array layers and several vertical array layers.

[0106] Several horizontal array layers are sequentially designated as the Nth layer from the center outwards. 横 N 横 +1……N 横 +n layers, at least the Nth layer exists. 横 The spacing between adjacent yarn bobbins 11 in layer +na is greater than that of the Nth layer. 横 The spacing between adjacent yarn bobbins 11 in the +nb layer.

[0107] For example, such as Figure 1 As shown, several horizontal array layers are sequentially labeled as the first horizontal layer 13, the second horizontal layer 14, and the third horizontal layer 15 from the center outwards. When a = 0 and b = 1, the spacing between adjacent yarn bobbins 11 in the third horizontal layer 15 is greater than the spacing between adjacent yarn bobbins 11 in the second horizontal layer 14.

[0108] For example, such as Figure 3As shown, several horizontal array layers are sequentially labeled as the first horizontal layer 13, the second horizontal layer 14, and the third horizontal layer 15 from the center outwards; the spacing between adjacent yarn bobbins 11 in the third horizontal layer 15 is greater than the spacing between adjacent yarn bobbins 11 in the second horizontal layer 14; the spacing between adjacent yarn bobbins 11 in the second horizontal layer 14 is greater than the spacing between adjacent yarn bobbins 11 in the first horizontal layer 13.

[0109] Or, such as Figure 4 As shown, several vertical array layers are sequentially labeled as the Nth layer from the center outwards. 纵 N 纵 +1……N 纵 +n layers, at least the Nth layer exists. 纵 The spacing between adjacent yarn bobbins 11 in layer +na is greater than that of the Nth layer. 纵 The spacing between adjacent yarn bobbins 11 in the +nb layer.

[0110] In another embodiment of this invention, the spacing between adjacent horizontal array layers from the center outwards is denoted as Lth. 横 L 横 +1……L 横 +n intervals, at least the Lth interval exists 横 +na spacing is greater than Lth 横 +nb spacing.

[0111] For example, such as Figure 4 As shown, the spacing between adjacent horizontal array layers from the center outwards is denoted as the first spacing 16, the second spacing 17, and the third spacing 18. When a = 0 and b = 1, the third spacing 18 is greater than the second spacing 17. When a = 1 and b = 2, the second spacing 17 is greater than the first spacing 16.

[0112] Alternatively, in a plurality of vertical array layers, the spacing between adjacent vertical array layers from the center outwards is denoted as Lth. 纵 L 纵 +1……L 纵 +n intervals, at least the Lth interval exists 纵 +na spacing is greater than Lth 纵 +nb spacing.

[0113] Preferably, the yarn frame 1 has mounting positions 12 for mounting a plurality of yarn bobbins 11, the Nth... 纵 +na layer yarn bobbins 11 are arranged at 2-3 installation positions 12, one yarn bobbin 11 is arranged, the Nth layer 纵 +nb layer yarn bobbins 11 are arranged in a row with 1-2 installation positions 12.

[0114] Preferably, the yarn bobbins 11 of the Nth longitudinal + na layer and the yarn bobbins 11 of the Nth longitudinal + nb layer are arranged in a staggered manner.

[0115] In this invention, the yarn bobbins 11 of the Nth longitudinal + na layer and the yarn bobbins 11 of the Nth longitudinal + nb layer are staggered to avoid the cross-dislocation of yarns during the traction process, which makes the carbon fiber yarn bundle have good uniformity. During impregnation, the adhesive can fully penetrate between the yarns, ensuring the uniformity of the impregnation.

[0116] In another embodiment of this invention, the array layer includes a plurality of circular array layers arranged concentrically from the inside out. These circular array layers are sequentially designated as the Nth layer from the center outwards. 圈 N 圈 +1……N 圈 +n layers, at least the Nth layer exists. 圈 The spacing between adjacent yarn bobbins in layer +na is greater than that of the Nth layer. 圈 The spacing between adjacent yarn bobbins in the +nb layer.

[0117] For example, several circular array layers are sequentially labeled as the 1st layer, the 2nd layer, and the 3rd layer from the center outwards. When a = 0 and b = 1, the spacing between adjacent yarn bobbins 11 in the 3rd layer is greater than the spacing between adjacent yarn bobbins 11 in the 2nd layer.

[0118] For example, several circular array layers are sequentially labeled as layer 1, layer 2, layer 3, layer 4, layer 5, and layer 6 from the center outwards. Specifically, the spacing between adjacent yarn bobbins 11 in layer 6 is greater than that in layer 5; the spacing between adjacent yarn bobbins 11 in layer 5 is greater than that in layer 4; the spacing between adjacent yarn bobbins 11 in layer 4 is greater than that in layer 3; the spacing between adjacent yarn bobbins 11 in layer 3 is greater than that in layer 2; and the spacing between adjacent yarn bobbins 11 in layer 2 is greater than that in layer 1.

[0119] Preferably, in the first, second, third, fourth, fifth, and sixth layers, the yarn cylinders 11 of adjacent layers are arranged in a staggered manner.

[0120] In this embodiment, the Nth 圈 The spacing between adjacent yarn bobbins in layer +na is greater than that of the Nth layer. 圈The spacing between adjacent yarn bobbins in the +nb layer, meaning the larger spacing between adjacent yarns in the outer layer and the smaller spacing between adjacent yarns in the inner layer, prevents the carbon fiber yarns drawn from the yarn bobbins on the yarn frame from crossing or misaligning during heating, impregnation, preforming, curing, post-curing, and traction processes. This ensures the stability of the heating, impregnation, forming, and curing processes, resulting in good uniformity of the carbon fiber yarn bundles. Furthermore, this leads to uniform and stable mechanical properties of the carbon fiber sheets made from these uniform carbon fiber yarn bundles, particularly significantly improving the mechanical properties of carbon fiber sheets with a circular cross-section. The system also includes an impregnation device sequentially arranged with the yarn frame 1. Several yarn feeders 9 are positioned between the impregnation device and the yarn frame 1, arranged longitudinally. Each yarn feeder 9 has several transversely arranged ceramic eyes 91 for the yarn to pass through, through which the yarn is drawn from the yarn bobbin 11.

[0121] Specifically, such as Figure 2 As shown, the yarn-making device 9 includes several strip-shaped rectangular frames, which are arranged horizontally and parallel to each other, and vertically arranged in a stepped manner from top to bottom. Each strip-shaped rectangular frame has several porcelain eyelets 91 penetrating it, arranged sequentially along the length of the frame, with equal spacing between adjacent eyelets. In this invention, several yarn-making devices 9 are arranged longitudinally between the yarn frame 1 and the impregnation device. The carbon fiber yarn 10 is drawn through the horizontally arranged porcelain eyelets 91 on the yarn-making device 9, increasing the width of the carbon fiber yarn 10 horizontally and uniformly layering it vertically. This allows the carbon fiber yarn 10 to be drawn to the impregnation device with a certain width and multi-layered arrangement, further ensuring that the adhesive is fully dispersed among the carbon fiber yarns 10, guaranteeing sufficient and uniform impregnation.

[0122] Furthermore, such as Figure 1As shown, the plurality of yarn bobbins 11 include an upper yarn bobbin 11 located at the top and a lower yarn bobbin 11 located at the bottom. The yarn of the upper yarn bobbin 11 passes through the upper yarn fabricator 9, and the yarn of the lower yarn bobbin 11 passes through the lower yarn fabricator 9. The distance from the upper yarn bobbin 11 to the upper yarn fabricator 9 is less than the distance from the lower yarn bobbin 11 to the lower yarn fabricator 9. Specifically, the impregnation device includes an impregnation tank 101, and the several strip-shaped rectangular frames of the yarn weaver 9 are, from top to bottom, a first strip-shaped rectangular frame, a second strip-shaped rectangular frame, a third strip-shaped rectangular frame, and a fourth strip-shaped rectangular frame; the distance from the first strip-shaped rectangular frame to the center of the bottom of the impregnation tank 101 is greater than the distance from the second strip-shaped rectangular frame to the center of the bottom of the impregnation tank 101; the distance from the second strip-shaped rectangular frame to the center of the bottom of the impregnation tank 101 is greater than the distance from the third strip-shaped rectangular frame to the center of the bottom of the impregnation tank 101; and the distance from the third strip-shaped rectangular frame to the center of the bottom of the impregnation tank 101 is greater than the distance from the fourth strip-shaped rectangular frame to the center of the bottom of the impregnation tank 101.

[0123] The yarn bobbins 11 are sequentially referred to from top to bottom as the first layer, second layer, third layer, fourth layer, fifth layer, and sixth layer yarn bobbins 11. The yarn on the first layer yarn bobbin 11 passes through the porcelain eye 91 on the first strip-shaped rectangular frame, the yarn on the second layer yarn bobbin 11 passes through the porcelain eye 91 on the second strip-shaped rectangular frame, the yarn on the third layer yarn bobbin 11 passes through the porcelain eye 91 on the third strip-shaped rectangular frame, and the yarn on the fourth, fifth, and sixth layers yarn bobbins 11 passes through the porcelain eye 91 on the fourth strip-shaped rectangular frame.

[0124] This configuration allows the carbon fiber yarns drawn from the upper and lower yarn bobbins 11 to enter the impregnation device simultaneously, ensuring the synchronization of impregnation during the production of carbon fiber sheets. This results in uniform and stable mechanical properties of the carbon fiber sheets obtained after preforming, curing, post-curing, and stretching.

[0125] Furthermore, the porcelain eyelets 91 on the yarn-drying device 9 are arranged in transverse layers. Specifically, the porcelain eyelets 91 in adjacent layers are staggered; preferably, the porcelain eyelets 91 on adjacent yarn-drying devices 9 are staggered; more preferably, each row on the yarn-drying device 9 has 10-20 porcelain eyelets 91.

[0126] In this invention, several ceramic eyelets 91 on the yarn-making device 9 are arranged in transverse layers, so that the carbon fiber yarns 10 pulled out by each yarn-making device 9 can be layered, and the adhesive can be fully dispersed between the layers of the carbon fiber yarns 10.

[0127] The ceramic eyelets 91 on adjacent yarn feeders 9 are staggered, so that the spacing between adjacent carbon fiber yarns 10 is equal, which further makes the amount of adhesive between adjacent carbon fiber yarns 10 basically equal, thus ensuring the uniformity of adhesive impregnation.

[0128] Furthermore, the impregnation apparatus of the present invention includes:

[0129] Impregnation tank 101,

[0130] The layering device, located above the wall of the impregnation tank 101, is formed by several longitudinally spaced guide rollers. The yarn drawn by the yarn frame 1 and the heating device 2 is layered by the guide rollers and impregnated with glue in the impregnation tank 101.

[0131] In this invention, a layerer is provided in the impregnation tank 101, so that the carbon fiber yarn 10 drawn into the impregnation tank 101 can fully contact the adhesive liquid in the impregnation tank 101 under the layering action of the layerer, thus ensuring sufficient impregnation.

[0132] Furthermore, the impregnation tank 101 includes a yarn inlet end and a yarn outlet end, and the separator includes an impregnation separator 102 and an extrusion separator 103. The impregnation separator 102 is disposed between the yarn inlet end and the yarn outlet end, and the extrusion separator 103 is positioned higher than the impregnation separator 102 at the yarn outlet end.

[0133] The impregnation layerer 102 of the present invention is disposed between the yarn inlet end and the yarn outlet end. The carbon fiber yarn 10 is drawn onto the impregnation layerer 102. Under the layering and positioning action of the impregnation layerer 102, it can fully contact the adhesive liquid, avoiding the phenomenon that the carbon fiber yarn 10 is stacked together or floats out of the adhesive liquid, resulting in poor impregnation effect.

[0134] The extrusion separator 103 of the present invention is positioned higher than the impregnation separator 102 at the yarn exit end. When the carbon fiber yarn 10 is pulled to the yarn exit end, it is squeezed by the guide roller of the impregnation separator 102, which squeezes the excess glue on the carbon fiber yarn back into the impregnation tank 101. This avoids waste of glue and ensures that the carbon fiber yarn 10 has an appropriate amount and uniform distribution of glue, thus guaranteeing the uniformity and stability of the impregnated carbon fiber yarn 10.

[0135] In this invention, the spacing between adjacent guide rollers of the dip-dipping separator 102 is greater than the spacing between adjacent guide rollers of the extrusion separator 103.

[0136] In this invention, the spacing between adjacent guide rollers of the impregnation separator 102 is relatively large to ensure sufficient adhesive between the guide rollers, thereby ensuring adequate impregnation; the spacing between adjacent guide rollers of the extrusion separator 103 is relatively small to ensure that excess adhesive on the impregnated carbon fiber yarn 10 can be completely squeezed out. In this invention, the impregnation tank 101 is a V-shaped groove, and the impregnation separator 102 is located above the lowest point of the V-shaped groove.

[0137] The impregnation tank 101 is a V-shaped groove, which makes the adhesive depth corresponding to the lowest point of the V-shaped groove relatively deep. By setting an impregnation layerer 102 above the lowest point of the V-shaped groove, the carbon fiber yarn 10 can be fully impregnated in the area with a deeper adhesive depth, making full and reasonable use of the adhesive. The purpose of fully impregnating the carbon fiber yarn 10 can be achieved without using a large amount of adhesive.

[0138] Furthermore, the slope of the yarn inlet sidewall 1011 of the impregnation tank is greater than the slope of the yarn outlet sidewall 1012 of the impregnation tank.

[0139] In this invention, the slope of the side wall 1011 at the yarn inlet of the impregnation tank is relatively large, which allows the carbon fiber yarn 10 to be drawn to the bottom of the impregnation tank 101 for impregnation in a shorter time and at a faster speed, thus ensuring a faster impregnation rate. The slope of the side wall 1012 at the yarn outlet of the impregnation tank is relatively small, which makes it difficult for the adhesive on the carbon fiber yarn 10 to flow downwards along the yarn when it is pulled out from the yarn outlet, further ensuring the stability of the adhesive on the yarn after impregnation.

[0140] Furthermore, the inner wall of the impregnation tank 101 is provided with a flow channel, which extends from the edge of the opening of the impregnation tank 101 towards the bottom of the impregnation tank 101. The width of the flow channel is at least the same as the length of the strip-shaped rectangular frame of the yarn-weaving device 9. This arrangement allows the adhesive falling from the carbon fiber yarn 10 to flow along the flow channel to the bottom of the impregnation tank 101 in a timely manner, thereby improving the utilization rate of the adhesive. The curing device 4 in this invention includes:

[0141] The solidification mold 41 has a yarn inlet end and a yarn outlet end.

[0142] Heater 42 is disposed on the curing mold 41 and located on the yarn inlet side of the curing mold 41.

[0143] The present invention provides a heater that is positioned on the curing mold and located at the yarn inlet end of the curing mold 41, so that the large tow carbon fiber yarn entering the curing mold 41 can be fully heated, thus ensuring sufficient curing.

[0144] Example 2

[0145] The present invention also provides a production process for 35-50K carbon fiber sheets, which is used to produce carbon fiber sheets using 35-50K carbon fiber.

[0146] The production process of this invention uses any of the production equipment described in the above technical solutions to produce 35-50K carbon fiber sheets.

[0147] The production process includes:

[0148] S1. A number of carbon fiber yarns 10 are drawn out from a number of yarn bobbins 11 on the yarn frame 1. The number of carbon fiber yarns 10 are arranged in an array. The array includes a number of array layers. The array layers are numbered N, N+1...N+n from the center outwards. At least there exists a distance between adjacent yarns in the N+na layer that is greater than the distance between adjacent yarns in the N+nb layer, where a and b are both greater than or equal to 0, and a < b.

[0149] S2. The drawn carbon fiber yarn 10 is heated, impregnated, pre-formed, cured, post-cured, and drawn to obtain carbon fiber sheet.

[0150] This invention uses 35-50K large-tow carbon fiber to produce carbon fiber sheets, which reduces the number of carbon fiber yarns used, lowers the production cost of carbon fiber sheets, and further reduces the cost of using carbon fiber sheets to manufacture wind turbine blades.

[0151] In this invention, the spacing between adjacent yarns in the N+na layer is greater than the spacing between adjacent yarns in the N+nb layer. That is, the spacing between adjacent yarns in the outer layer is larger, while the spacing between adjacent yarns in the inner layer is smaller. This makes it less likely for the carbon fiber yarns 10 to cross or misalign during the traction and extrusion process to form the sheet, resulting in good uniformity of the carbon fiber yarn bundles formed by the carbon fiber yarns 10. The uniformity of the carbon fiber yarn bundles after impregnation is also good, further ensuring that the carbon fiber sheet made from the uniform carbon fiber yarn bundles has uniform and stable mechanical properties.

[0152] Furthermore, in step S1, the array layer includes several horizontal array layers and several vertical array layers.

[0153] Several horizontal array layers are sequentially designated as the Nth layer from the center outwards. 横 N 横 +1……N 横 +n layers, at least the Nth layer exists. 横 The spacing between adjacent yarns in layer +na is greater than that of layer N. 横 The spacing between adjacent yarns in the +nb layer;

[0154] For example, such as Figure 1 As shown, several horizontal array layers are sequentially labeled as the first horizontal layer 13, the second horizontal layer 14, and the third horizontal layer 15 from the center outwards. When a = 0 and b = 1, the spacing between adjacent yarn bobbins 11 in the third horizontal layer 15 is greater than the spacing between adjacent yarn bobbins 11 in the second horizontal layer 14. Furthermore, the spacing between adjacent yarns drawn from the third horizontal layer 15 is greater than the spacing between adjacent yarns drawn from the second horizontal layer 14.

[0155] Alternatively, several vertical array layers can be sequentially designated as the Nth layer from the center outwards. 纵 N纵 +1……N 纵 +n layers, at least the Nth layer exists. 纵 The spacing between adjacent yarns in layer +na is greater than that of layer N. 纵 The spacing between adjacent yarns in the +nb layer.

[0156] Furthermore, in step S1,

[0157] In a series of horizontal array layers, the spacing between adjacent horizontal array layers from the center outwards is denoted as Lth. 横 L 横 +1……L 横 +n intervals, at least the Lth interval exists 横 +na spacing is greater than Lth 横 +nb spacing;

[0158] Alternatively, in a plurality of vertical array layers, the spacing between adjacent vertical array layers from the center outwards is denoted as Lth. 纵 L 纵 +1……L 纵 +n intervals, at least the Lth interval exists 纵 +na spacing is greater than Lth 纵 +nb spacing.

[0159] As one embodiment of this example, the yarn frame 1 has mounting positions 12 for mounting a plurality of yarn bobbins 11. In step S1, when the outermost yarn is pulled out, a carbon fiber yarn 10 is pulled out every 2-3 mounting positions 12. When the inner yarn is pulled out, a carbon fiber yarn 10 is pulled out every 1-2 mounting positions 12.

[0160] Furthermore, in step S1, the outer layer yarn and the inner layer yarn are arranged in a staggered manner.

[0161] In this invention, the outer layer yarn and the inner layer yarn are staggered, so that the adjacent carbon fiber yarns in the carbon fiber yarn bundle formed by the inner layer yarn and the outer layer yarn are not easily misaligned, thereby making the formed carbon fiber yarn bundle have good uniformity. During impregnation, the amount of glue between adjacent carbon fiber yarns is basically equal, ensuring the uniformity of impregnation.

[0162] Example 3

[0163] This embodiment uses the production equipment from Embodiment 1 to prepare carbon fiber sheets. Specifically, it includes:

[0164] S1. A yarn bobbin 11 containing 35K carbon fiber yarn is installed on the yarn frame 1;

[0165] S2. The yarn on the yarn tube 11 is drawn to the heating device 2 for heating;

[0166] S3. After heating, the yarn is drawn to the yarn feeder 9 so that it passes through four longitudinally arranged yarn feeders 9. Each yarn feeder 9 has two layers of ceramic eyelets 91, and each layer of ceramic eyelets 91 includes 18 ceramic eyelets.

[0167] S4. The yarn is then drawn onto the impregnation separator 102 on the impregnation tank 101 and pulled out via the extrusion separator 103. The impregnation tank 101 is automatically dispensed by the automatic dispensing machine 105. Specifically, the automatic dispensing machine 105 mixes the resin, curing agent, release agent and filler in proportion and injects them into the impregnation tank 101 at a uniform speed, and the liquid level 104 of the adhesive is lower than the maximum depth of the impregnation tank 101.

[0168] The impregnation tank 101 has a circulating water system covering the outside of the impregnation tank 101 for temperature control of the liquid inside the impregnation tank 101. The temperature of the circulating water system is 40-60℃, which effectively reduces the viscosity of the adhesive liquid inside the impregnation tank 101 and keeps it at a stable level.

[0169] S5. The impregnated yarn is drawn to the preforming device 3 for preforming to obtain the board;

[0170] S6. The pre-formed sheet material is pulled to the curing device for curing; wherein the curing device includes three temperature zones arranged in sequence, the temperature of the first temperature zone is 155-175℃, the temperature of the second temperature zone is 180-230℃, and the temperature of the third temperature zone is 180-230℃; in this embodiment, the temperature of the first temperature zone is controlled at 175℃, the temperature of the second temperature zone is 200℃, and the temperature of the third temperature zone is 230℃.

[0171] S7. The cured board is pulled to the post-curing device 5 for post-curing; during post-curing, the temperature of the carbon fiber board needs to be gradually reduced; in this embodiment, the temperature of the carbon fiber board is gradually reduced from 230°C to 175°C.

[0172] S8. After post-curing, the board is pulled to the traction device for traction; the traction speed is slightly lower, controlled at 35-60cm / min, and the traction force is slightly higher, controlled at 15-35KN, so as to ensure the uniformity of the board performance.

[0173] S9. Finally, the sheet material is pulled to the winding device 8 for winding, and then cut using the cutting device 7 to obtain carbon fiber sheet material.

[0174] Example 4

[0175] The only difference from Example 3 is the use of 48K carbon fiber yarn.

[0176] Example 5

[0177] The only difference from Example 3 is the use of 50K carbon fiber yarn.

[0178] Experimental Example 1

[0179] The carbon fiber sheets prepared in Examples 3-5 contain 45-70% carbon fiber by volume and 30-55% resin by volume. In this experiment, the tensile strength and tensile modulus of the carbon fiber sheets prepared in Examples 3-5 were tested using international standard ISO 527; the compressive strength and compressive modulus of the carbon fiber sheets prepared in Examples 3-5 were tested using international standard ISO 14126; and the glass transition temperature of the carbon fiber sheets prepared in Examples 3-5 was tested using international standard ISO 11357-2. The test results are shown in Table 1 below.

[0180] Table 1:

[0181] Example 3 ≥1450 ≥130 ≥950 ≥125 ≥100 Example 4 ≥1420 ≥128 ≥950 ≥123 ≥100 Example 5 ≥1400 ≥128 ≥950 ≥123 ≥100

[0182] As can be seen from the table above, the carbon fiber sheet of the present invention has a tensile strength ≥1400 MPa, a tensile modulus ≥128 GPa, a compressive modulus ≥123 GPa, and a glass transition temperature Tg ≥100℃. These performance indicators meet the requirements for carbon fiber sheets used in the main beam of 100-meter-class wind turbine blades in China and can be widely applied in the field of wind turbine blade technology.

[0183] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A production equipment for 35-50K carbon fiber sheets, comprising a yarn rack and a plurality of yarn bobbins arranged on the yarn rack, characterized in that, The device includes several yarn-making devices and a sizing device arranged sequentially with the yarn frame. The yarn bobbins are arranged in an array, which includes several array layers. The array layers are numbered N, N+1, ..., N+n from the center outwards. At least in the N+na layer, the distance between adjacent yarn bobbins is greater than the distance between adjacent yarn bobbins in the N+nb layer, where a and b are both greater than or equal to 0, and a < b. The plurality of yarn-weaving devices are arranged longitudinally between the yarn frame and the impregnation device. Each yarn-weaving device has a plurality of transversely arranged ceramic eyelets for the yarn to pass through, and the yarn is drawn from the yarn bobbin to the ceramic eyelets. The plurality of yarn bobbins include an uppermost yarn bobbin and a lowermost yarn bobbin, wherein the yarn of the uppermost yarn bobbin passes through an upper yarn weaving device, and the yarn of the lowermost yarn bobbin passes through a lower yarn weaving device, wherein the distance from the uppermost yarn bobbin to the upper yarn weaving device is less than the distance from the lowermost yarn bobbin to the lower yarn weaving device.

2. The production equipment for 35-50K carbon fiber sheets according to claim 1, characterized in that: The array layer includes several horizontal array layers and several vertical array layers. Several horizontal array layers are sequentially designated as the Nth layer from the center outwards. 横 N 横 +1……N 横 +n layers, at least the Nth layer exists. 横 The spacing between adjacent yarn bobbins in layer +na is greater than that of layer N. 横 The spacing between adjacent yarn bobbins in the +nb layer; Alternatively, several vertical array layers can be sequentially designated as the Nth layer from the center outwards. 纵 N 纵 +1……N 纵 +n layers, at least the Nth layer exists. 纵 The spacing between adjacent yarn bobbins in layer +na is greater than that of layer N. 纵 The spacing between adjacent yarn bobbins in the +nb layer.

3. The production equipment for 35-50K carbon fiber sheets according to claim 2, characterized in that: In a series of horizontal array layers, the spacing between adjacent horizontal array layers from the center outwards is denoted as Lth. 横 L 横 +1……L 横 +n intervals, at least the Lth interval exists 横 +na spacing is greater than Lth 横 +nb spacing; Alternatively, in a plurality of vertical array layers, the spacing between adjacent vertical array layers from the center outwards is denoted as Lth. 纵 L 纵 +1……L 纵 +n intervals, at least the Lth interval exists 纵 +na spacing is greater than Lth 纵 +nb spacing.

4. The production equipment for 35-50K carbon fiber sheets according to claim 1, characterized in that: The porcelain eyelets on the yarn-drying device are arranged in horizontal layers, with adjacent layers of porcelain eyelets staggered.

5. The production equipment for 35-50K carbon fiber sheets according to claim 1, characterized in that: The impregnation apparatus includes: Dipping tank, The layerer is located above the wall of the impregnation tank and is formed by several longitudinally spaced guide rollers. The yarn drawn out by the yarn frame passes through the guide rollers to be layered and impregnated in the impregnation tank.

6. The production equipment for 35-50K carbon fiber sheets according to claim 5, characterized in that: The impregnation tank includes a yarn inlet end and a yarn outlet end. The separator includes an impregnation separator and an extrusion separator. The impregnation separator is located between the yarn inlet end and the yarn outlet end. The extrusion separator is located higher than the impregnation separator at the yarn outlet end. The distance between adjacent guide rollers of the impregnation separator is greater than the distance between adjacent guide rollers of the extrusion separator.

7. The production equipment for 35-50K carbon fiber sheets according to claim 6, characterized in that: The impregnation tank is a V-shaped groove, and the impregnation layerer is located above the lowest point of the V-shaped groove.

8. A production equipment for 35-50K carbon fiber sheets according to any one of claims 1-7, characterized in that: It also includes a curing device arranged sequentially with the yarn frame and the impregnation device. The curing device includes: The solidification mold has a yarn inlet end and a yarn outlet end. A heater is provided on the curing mold and located on the yarn inlet side of the curing mold.

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