Wind power generation blade and preparation method thereof

Abstract

The present invention belongs to the technical field of composite material forming. The present invention provides a wind power generation blade and a preparation method thereof, wherein the fiber yarn is sequentially subjected to yarn laying, yarn threading, tension application, tension detection, resin compounding, resin dipping, product forming, radiation curing, thermal curing, cooling, traction, cutting, online detection, winding, and unwinding; the thermal curing method is contact heating, radiation or convection, and the thermal curing is gradient heating or isothermal heating, and the gradient heating is high temperature first and then low temperature; the traction speed is 2 to 5 m / min. The preparation method of the present invention realizes rapid prototyping of the product through a dual curing process combining ultraviolet radiation curing and thermal curing, perfectly combining the advantages of rapid prototyping of radiation curing and excellent mechanical properties of thermal curing, and effectively improving production efficiency; the straightness of the wind power generation blade is good, the product is cured at low temperature, there is no product deformation caused by uneven stress, and the product yield is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of composite material molding, and in particular to a wind power generation blade and a preparation method thereof. Background Art

[0002] At present, the overall goal of the research and development of glass fiber pultrusion molding process is to increase the curing speed of resin and reduce manufacturing costs by increasing production speed. There are various systems of resins on the market that can be used for rapid pultrusion process. The curing speed of unsaturated system resin is faster than that of epoxy system, and the curing speed of radiation curing process is faster than that of thermal curing process. However, wind turbine blades have high requirements for product fatigue performance, and there is no suitable wind turbine blade molding process on the market that can meet the high fatigue resistance requirements.

[0003] Therefore, it is of great significance to study and develop a method for preparing wind turbine blades with good fatigue resistance and mechanical properties. Summary of the invention

[0004] The purpose of the present invention is to provide a wind power generation blade and a preparation method thereof in view of the deficiencies in the prior art.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] The present invention provides a method for preparing a wind power generation blade, comprising the following steps:

[0007] The fiber yarn is sequentially subjected to yarn feeding, yarn threading, tension application, tension detection, resin compounding, resin dipping, product molding, radiation curing, thermal curing, cooling, pulling, cutting, online detection, winding, and unwinding;

[0008] The fiber yarn is a reinforcing fiber, and the reinforcing fiber comprises aramid, nylon, glass fiber or quartz fiber;

[0009] The heat curing method is contact heating, radiation or convection, the heat curing is gradient heating or isothermal heating, the gradient heating is high temperature first and then low temperature; the heat curing temperature is 100-250°C, and the heat curing time is ≥60s;

[0010] The traction speed is 2-5 m / min.

[0011] Preferably, the yarn threading is that the fiber yarn passes through a tension control regulator, a tension detector, a product forming groove, a forming mold, a curing structure, a traction machine, and a cutting machine in sequence.

[0012] Preferably, threading the yarn further comprises passing the fiber yarn through a fiber dehumidification and heating structure and a winding machine, wherein the fiber yarn passes through a tension detector, then passes through the fiber dehumidification and heating structure, passes through a cutting machine, and then passes through the winding machine;

[0013] After the fiber yarn is threaded, the demoulding cloth is also combined with the fiber yarn. Before the combination, the demoulding cloth passes through the fiber dehumidification and heating structure, the product molding groove, and the molding mold in sequence.

[0014] Preferably, the applied tension value is 7-13N; the tension detection includes online real-time detection and timed detection, and the time interval of the timed detection is 11-13h.

[0015] Preferably, after the tension is detected, dehumidification is also included, the dehumidification temperature is 100-130° C., and the dehumidification time is ≥60s.

[0016] Preferably, before compounding with the resin, the temperature of the resin is 40 to 70°C, and the resin is added to the product molding tank;

[0017] The dipping is carried out by extrusion through the holes or the dividing rods, and the number of extrusion passes is 4 to 8.

[0018] Preferably, the product forming includes preforming and forming, the number of preforming molds is 1 to 3 groups, and the number of forming molds is 1 group.

[0019] Preferably, the radiation curing is ultraviolet curing, and the light intensity is 12-22 J / cm 2 The cooling is air flow gradient cooling, and the air flow temperature is 30-40°C and 5-20°C successively.

[0020] Preferably, the cutting length is 180-220 m; and the items of online inspection include apparent quality, product size and straightness.

[0021] The present invention also provides a wind power generation blade prepared by the preparation method, wherein the cross-sectional shape of the blade is rectangular, circular or polygonal with an arc.

[0022] The beneficial effects of the present invention include the following:

[0023] 1) The preparation method of the present invention realizes rapid prototyping of products through a dual curing process combining ultraviolet radiation curing and thermal curing, which makes up for the shortcomings of slow prototyping speed of thermal curing process and poor mechanical properties of ultraviolet radiation curing, perfectly combines the advantages of rapid prototyping of radiation curing and excellent mechanical properties of thermal curing, and effectively improves production efficiency.

[0024] 2) The preparation method of the present invention can realize the rapid and continuous production of wind power blades. The wind power blades are cured and formed outside the mold. No release agent needs to be added to the resin. The surface roughness requirements of the product are met by changing the internal structure of the mold during the production process without using a release cloth; the material cost is reduced by 10%.

[0025] 3) The resin of the present invention has a long operating time, and its direct benefit is that if a temporary equipment failure occurs during the production process, the machine can be shut down at any time for processing, while the shutdown of the traditional process requires complete cleaning of the materials in the production process and a long time to wait for the equipment to cool down; the resin of the present invention is stored in a closed environment, and the feeding and mixing are completed by equipment, so its quality stability is good, the resin volatilization during the production process is small, and the utilization rate of the resin is high.

[0026] 4) The wind turbine blades of the present invention have good straightness, the product is solidified at low temperature, there is no product deformation caused by uneven stress, and the product yield is greatly improved. DETAILED DESCRIPTION

[0027] The present invention provides a method for preparing a wind power generation blade, comprising the following steps:

[0028] The fiber yarn is sequentially subjected to yarn feeding, yarn threading, tension application, tension detection, resin compounding, resin dipping, product molding, radiation curing, thermal curing, cooling, pulling, cutting, online detection, winding, and unwinding;

[0029] The fiber yarn is a reinforcing fiber, and the reinforcing fiber comprises aramid, nylon, glass fiber or quartz fiber;

[0030] The heat curing method is contact heating, radiation or convection, the heat curing is gradient heating or isothermal heating, the gradient heating is high temperature first and then low temperature; the heat curing temperature is 100-250°C, and the heat curing time is ≥60s;

[0031] The traction speed is 2-5 m / min.

[0032] In the present invention, the upper yarn preferably places the fiber yarns of the entire yarn roll according to the number labels, and merges each fiber yarn in an orderly manner to the end of the upper yarn area according to a specific direction, so that it can be distinguished which yarn roll each fiber yarn comes from; the number of rolls of the yarn roll is preferably 200 to 500, and more preferably 280 to 440.

[0033] In the present invention, the yarn threading is preferably that the fiber yarn passes through a tension control regulator, a tension detector, a product molding groove, a molding mold, a curing structure, a traction machine, and a cutting machine in sequence; the yarn threading is further preferably also includes passing the fiber yarn through a fiber dehumidification and heating structure and a winding machine, and the fiber yarn passes through the tension detector and then the fiber dehumidification and heating structure, and then the cutting machine and then the winding machine.

[0034] The threading process of the present invention ensures that the fiber yarns do not cross or get tangled.

[0035] In the present invention, after threading the fiber yarn, it is preferred that a subsequent process is also included in which a release cloth is combined with the fiber yarn to complete the subsequent process. Before the combination, the release cloth preferably passes through the fiber dehumidification and heating structure, the product forming groove, and the forming mold in sequence.

[0036] In the present invention, the applied tension value is preferably 7-13N, more preferably 9-11N, and more preferably 10N; the applied tension value is controlled within ±3N of the design value; tension is uniformly applied to all fiber yarns by a tension applying device; tension detection includes online real-time detection and timed detection, and in the timed detection, the time interval between every two detections is preferably 11-13h, and more preferably 12h, to ensure that the actual tension value of each fiber yarn is within the set range during the production process.

[0037] In the present invention, after the tension is detected, dehumidification is preferably further performed. The dehumidification temperature is preferably 100 to 130° C., more preferably 110 to 120° C.; the dehumidification time is preferably ≥ 60 s, more preferably ≥ 90 s.

[0038] In the present invention, moisture on the surfaces of fiber yarns and release cloth during the production process is removed by dehumidification.

[0039] In the present invention, before compounding with the resin, the resin is preferably heated to 40-70° C. by a heating device, and more preferably heated to 50-60° C.; the resin is preferably added to the product molding tank by a pump.

[0040] The resin of the present invention can be circulated to filter out impurities generated during the production process.

[0041] In the present invention, the dipping is preferably carried out by extrusion through holes or separators, and the number of extrusions is preferably 4 to 8, more preferably 5 to 7, and more preferably 6. The dipping is carried out in the molding tank according to the designed direction, and impurities need to be cleaned regularly during the dipping process.

[0042] In the present invention, the product molding includes pre-molding and molding, the pre-molding mold is preferably 1 to 3 groups, and the molding mold is preferably 1 group; the size change of the pre-molding mold is ≤±10%; when the pre-molding mold is 2 to 3 groups, the thickness of the pre-molding mold is preferably reduced sequentially; the thickness of the pre-molding mold is ≥ the thickness of the molding mold.

[0043] In the present invention, the radiation curing is preferably ultraviolet curing, and the radiation curing is performed in the form of a surface light source; during the radiation curing, the light intensity is preferably 12 to 22 J / cm 2 , more preferably 15 to 20 J / cm 2 , more preferably 17 to 18 J / cm 2 .

[0044] In the present invention, the thermal curing method is preferably contact heating, radiation or convection, and the thermal curing is preferably gradient heating or isothermal heating, and the gradient heating is preferably high temperature first and then low temperature; the thermal curing temperature is preferably 100-250°C, more preferably 150-220°C, and more preferably 180-200°C; after the product temperature reaches the thermal curing temperature, it is kept warm, and the insulation time is preferably ≥60s, and more preferably ≥90s.

[0045] In the present invention, after the product temperature reaches the set value, a constant temperature treatment is performed to ensure that the resin is completely cured.

[0046] In the present invention, the cooling is preferably airflow gradient cooling, and the temperature of the airflow is preferably 30-40°C, 5-20°C, and more preferably 34-36°C, 10-15°C, in sequence.

[0047] In the present invention, the traction speed is preferably 2-5 m / min, more preferably 3-4 m / min, and more preferably 4.5 m / min; the traction is performed by a traction machine to achieve continuous production of the product at a set speed.

[0048] In the present invention, the cutting length is preferably 180 to 220 m, more preferably 190 to 210 m, and even more preferably 200 m.

[0049] In the present invention, the items to be detected online preferably include apparent quality, product size and straightness; the product size preferably includes width and thickness.

[0050] In the present invention, winding and reeling are performed according to the actually required length; and after unwinding, the unwinding is performed and ...

[0051] The present invention also provides a wind power generation blade prepared by the preparation method, wherein the cross-sectional shape of the blade is preferably a regular shape, and further preferably a rectangular, circular or arc-shaped polygon.

[0052] The technical solutions provided by the present invention are described in detail below in conjunction with the embodiments, but they should not be construed as limiting the protection scope of the present invention.

[0053] Example 1

[0054] Process 1, yarn loading: Place glass fibers (glass fiber specification: HMG 920HT-2400) with a width of 120 mm, a thickness of 5 mm, and 440 yarn rolls according to the number labels, and merge each fiber yarn in an orderly manner to the end of the yarn loading area according to a specific direction, so that it can be distinguished which yarn roll each fiber yarn comes from.

[0055] Process 2, yarn threading: The neat fiber yarn passes through the tension control regulator, tension detector, fiber dehumidification and heating structure, product forming tank, forming mold, curing structure, traction machine, cutting machine and winder in sequence according to the designed channel.

[0056] Step 3: Adding release cloth: The release cloth passes through the fiber dehumidification and heating structure, the product forming groove, and the forming mold in sequence, and then merges with the fiber yarn to complete the subsequent processes.

[0057] Step 4: Applying tension: Apply tension evenly to all fiber yarns through a tension applying device. The applied tension value is 10N and is controlled within ±3N of the designed value.

[0058] Process 5, tension detection: Regularly detect the tension value of the fiber yarn, the time interval of regular detection is 12 hours, and ensure that the actual tension value of each fiber yarn is within the set range during the production process.

[0059] Step 6: Dehumidification: The temperature is controlled at 125°C and the heating time is 90 seconds to remove moisture from the surface of the fiber yarn and the release cloth during the production process.

[0060] Step 7: Adding resin: The resin temperature is maintained at 60°C and the resin is added to the product molding tank via a pump.

[0061] Process 8: Dipping in glue: The fiber yarn and the demoulding cloth are dipped in glue in the molding tank according to the designed direction, and go through 6 extrusions. Impurities are cleaned regularly during the dipping process.

[0062] Process 9, product molding: three groups of pre-molding molds are selected, with thicknesses of 5.8mm, 5.5mm and 5.3mm respectively, and the molding mold thickness is 5.1mm.

[0063] Step 10: Radiation curing: Use 365nm UV light for curing, with a light intensity of 20J / cm 2 .

[0064] Step 11, thermal curing: contact heating is used for heat conduction heating. The heating temperatures are 220°C, 200°C and 180°C respectively. Heat at 180°C for 120s to ensure that the resin is completely cured.

[0065] Step 12: Cooling: First use 35°C airflow to cool down, then use 15°C airflow to cool down.

[0066] Process 13, traction: The traction speed is controlled at 3m / min to achieve continuous production of products.

[0067] Process 14: Cutting: The product is cut once every 200m in length.

[0068] Process 15: Online inspection: Online inspection of product width, thickness, surface quality, and straightness.

[0069] Process 16: Automatic winding: Winding and winding according to the actual required length.

[0070] Process 17: Automatic unwinding: unwinding, packaging and storage.

[0071] Example 2

[0072] Process 1, yarn loading: Place glass fibers (glass fiber specification: HMG 920HT-2400) with a width of 120 mm, a thickness of 5 mm, and 460 yarn rolls according to the number labels, and merge each fiber yarn in an orderly manner to the end of the yarn loading area according to a specific direction, so that it can be distinguished which yarn roll each fiber yarn comes from.

[0073] Process 2, yarn threading: The neat fiber yarn passes through the tension control regulator, tension detector, fiber dehumidification and heating structure, product forming tank, forming mold, curing structure, traction machine, cutting machine and winder in sequence according to the designed channel.

[0074] Step 3, applying tension: Apply tension evenly to all fiber yarns through a tension applying device, the applied tension value is 10N, and is controlled within ±3N of the design value.

[0075] Process 4: Tension detection: Regularly detect the tension value of the fiber yarn. The time interval for regular detection is 11.5 hours. During the production process, ensure that the actual tension value of each fiber yarn is within the set range.

[0076] Process 5, dehumidification: the temperature is controlled at 120°C, the heating time is 95s, and the moisture on the surface of the fiber yarn is removed during the production process.

[0077] Step 6: Adding resin: The resin temperature is maintained at 50°C and the resin is added to the product molding tank via a pump.

[0078] Process 7, dipping: The fiber yarn and the demoulding cloth are dipped in the molding tank according to the designed direction, and after 5 extrusions, impurities are regularly cleaned during the dipping process.

[0079] Process 8, product molding: Three groups of pre-molding molds are selected, with thicknesses of 5.8mm, 5.5mm and 5.3mm respectively, and the molding mold thickness is 5.1mm.

[0080] Step 9: Radiation curing: Use 365nm UV light for curing, with a light intensity of 20J / cm 2 .

[0081] Step 10, thermal curing: Select contact heating method for heat conduction heating, the heating temperatures are 220℃, 200℃ and 180℃ respectively, and heat at 180℃ for 120s to ensure that the resin is completely cured.

[0082] Step 11, cooling: first use 35°C airflow to cool down, then use 15°C airflow to cool down.

[0083] Process 12, traction: The traction speed is controlled at 3m / min to achieve continuous production of products.

[0084] Process 13: Cutting: The product is cut once every 200m in length.

[0085] Process 14: Online inspection: Online inspection of product width, thickness, surface quality, and straightness.

[0086] Process 15: Automatic winding: Winding and winding according to the actual required length.

[0087] Process 16: Automatic unwinding: unwinding, packaging and storage.

[0088] Example 3

[0089] Process 1, yarn loading: Place glass fibers (glass fiber specification: HMG 920HT-2400) with a width of 120 mm, a thickness of 5 mm, and 460 yarn rolls according to the number labels, and merge each fiber yarn in an orderly manner to the end of the yarn loading area according to a specific direction, so that it can be distinguished which yarn roll each fiber yarn comes from.

[0090] Process 2, yarn threading: The neat fiber yarn passes through the tension control regulator, tension detector, product forming groove, forming mold, curing structure, traction machine, cutting machine and winder in sequence according to the designed channel.

[0091] Step 3, applying tension: Apply tension evenly to all fiber yarns through a tension applying device, the applied tension value is 10N, and is controlled within ±3N of the design value.

[0092] Process 4: Tension detection: Regularly detect the tension value of the fiber yarn. The time interval for regular detection is 12.5 hours. During the production process, ensure that the actual tension value of each fiber yarn is within the set range.

[0093] Step 5: Adding resin: The resin temperature is maintained at 70°C and the resin is added to the product molding tank via a pump.

[0094] Process 6: Dipping in glue: The fiber yarn is dipped in glue in the molding tank according to the designed direction, and goes through 7 extrusions. Impurities are cleaned regularly during the dipping process.

[0095] Process 7, product molding: Three groups of pre-molding molds are selected, with thicknesses of 5.8mm, 5.5mm and 5.3mm respectively, and the molding mold thickness is 5.1mm.

[0096] Step 8: Radiation curing: Use 365nm UV light for curing, with a light intensity of 20J / cm 2 .

[0097] Step 9, thermal curing: Select contact heating method for heat conduction heating, the heating temperatures are 220℃, 200℃ and 180℃ respectively, and heat at 180℃ for 120s to ensure that the resin is completely cured.

[0098] Step 10, cooling: first use 30°C airflow to cool down, then use 10°C airflow to cool down.

[0099] Process 11, traction: The traction speed is controlled at 2.7m / min to achieve continuous production of products.

[0100] Process 12: Cutting: The product is cut once every 200m in length.

[0101] Process 13: Online inspection: Online inspection of product width, thickness, surface quality, and straightness.

[0102] Process 14: Automatic winding: Winding and winding according to the actual required length.

[0103] Process 15: Automatic unwinding: unwinding, packaging and storage.

[0104] Example 4

[0105] Process 1, yarn loading: Place glass fibers (glass fiber specification: HMG 920HT-2400) with a width of 60 mm, a thickness of 5 mm, and 220 yarn rolls according to the number labels, and merge each fiber yarn in an orderly manner to the end of the yarn loading area according to a specific direction, so that it can be distinguished which yarn roll each fiber yarn comes from.

[0106] Process 2, yarn threading: The neat fiber yarn passes through the tension control regulator, tension detector, fiber dehumidification and heating structure, product forming tank, forming mold, curing structure, traction machine, cutting machine and winder in sequence according to the designed channel.

[0107] Step 3: Adding release cloth: The release cloth passes through the fiber dehumidification and heating structure, the product forming groove, and the forming mold in sequence, and then merges with the fiber yarn to complete the subsequent processes.

[0108] Step 4: Applying tension: Apply tension evenly to all fiber yarns through a tension applying device. The applied tension value is 10N and is controlled within ±3N of the designed value.

[0109] Process 5, tension detection: Regularly detect the tension value of the fiber yarn, the time interval of regular detection is 12 hours, and ensure that the actual tension value of each fiber yarn is within the set range during the production process.

[0110] Step 6: Dehumidification: The temperature is controlled at 125°C and the heating time is 90 seconds to remove moisture from the surface of the fiber yarn and the release cloth during the production process.

[0111] Step 7: Adding resin: The resin temperature is maintained at 60°C and the resin is added to the product molding tank via a pump.

[0112] Process 8: Dipping in glue: The fiber yarn and the demoulding cloth are dipped in glue in the molding tank according to the designed direction, and go through 6 extrusions. Impurities are cleaned regularly during the dipping process.

[0113] Process 9, product molding: Two sets of pre-molding molds are selected, with thicknesses of 5.5mm and 5.3mm respectively, and the molding mold thickness is 5.1mm.

[0114] Step 10: Radiation curing: Use 365nm UV light for curing, with a light intensity of 20J / cm 2 .

[0115] Step 11, thermal curing: contact heating is used for heat conduction heating. The heating temperatures are 220°C, 200°C and 180°C respectively. Heat at 180°C for 120s to ensure that the resin is completely cured.

[0116] Step 12: Cooling: First use 35°C airflow to cool down, then use 15°C airflow to cool down.

[0117] Process 13, traction: The traction speed is controlled at 3m / min to achieve continuous production of products.

[0118] Process 14: Cutting: The product is cut once every 200m in length.

[0119] Process 15: Online inspection: Online inspection of product width, thickness, surface quality, and straightness.

[0120] Process 16: Automatic winding: Winding and winding according to the actual required length.

[0121] Process 17: Automatic unwinding: unwinding, packaging and storage.

[0122] Example 5

[0123] Process 1, yarn loading: Place glass fibers (glass fiber specification: HMG 920HT-2400) with a width of 60 mm, a thickness of 5 mm, and 230 yarn rolls according to the number labels, and merge each fiber yarn in an orderly manner to the end of the yarn loading area according to a specific direction, so that it can be distinguished which yarn roll each fiber yarn comes from.

[0124] Process 2, yarn threading: The neat fiber yarn passes through the tension control regulator, tension detector, fiber dehumidification and heating structure, product forming tank, forming mold, curing structure, traction machine, cutting machine and winder in sequence according to the designed channel.

[0125] Step 3, applying tension: Apply tension evenly to all fiber yarns through a tension applying device, the applied tension value is 10N, and is controlled within ±3N of the design value.

[0126] Process 4: Tension detection: Regularly detect the tension value of the fiber yarn. The time interval for regular detection is 11.5 hours. During the production process, ensure that the actual tension value of each fiber yarn is within the set range.

[0127] Process 5, dehumidification: the temperature is controlled at 120°C, the heating time is 95s, and the moisture on the surface of the fiber yarn is removed during the production process.

[0128] Step 6: Adding resin: The resin temperature is maintained at 55°C and the resin is added to the product molding tank via a pump.

[0129] Process 7: Dipping in glue: The fiber yarn and the demoulding cloth are dipped in glue in the molding tank according to the designed direction, and go through 6 extrusions. Impurities are cleaned regularly during the dipping process.

[0130] Process 8, product molding: Two sets of pre-molding molds are selected, with thicknesses of 5.5mm and 5.3mm respectively, and the molding mold thickness is 5.1mm.

[0131] Step 9: Radiation curing: Use 365nm UV light for curing, with a light intensity of 20J / cm 2 .

[0132] Step 10, thermal curing: Select contact heating method for heat conduction heating, the heating temperatures are 220℃, 200℃ and 180℃ respectively, and heat at 180℃ for 120s to ensure that the resin is completely cured.

[0133] Step 11, cooling: first use 35°C airflow to cool down, then use 15°C airflow to cool down.

[0134] Process 12, traction: The traction speed is controlled at 3m / min to achieve continuous production of products.

[0135] Process 13: Cutting: The product is cut once every 200m in length.

[0136] Process 14: Online inspection: Online inspection of product width, thickness, surface quality, and straightness.

[0137] Process 15: Automatic winding: Winding and winding according to the actual required length.

[0138] Process 16: Automatic unwinding: unwinding, packaging and storage.

[0139] Example 6

[0140] Process 1, yarn loading: Place glass fibers (glass fiber specification: HMG 920HT-2400) with a width of 60 mm, a thickness of 5 mm, and 230 yarn rolls according to the number labels, and merge each fiber yarn in an orderly manner to the end of the yarn loading area according to a specific direction, so that it can be distinguished which yarn roll each fiber yarn comes from.

[0141] Process 2, yarn threading: The neat fiber yarn passes through the tension control regulator, tension detector, product forming groove, forming mold, curing structure, traction machine, cutting machine and winder in sequence according to the designed channel.

[0142] Step 3, applying tension: Apply tension evenly to all fiber yarns through a tension applying device, the applied tension value is 10N, and is controlled within ±3N of the design value.

[0143] Process 4: Tension detection: Regularly detect the tension value of the fiber yarn. The time interval for regular detection is 12.5 hours. During the production process, ensure that the actual tension value of each fiber yarn is within the set range.

[0144] Step 5: Adding resin: The resin temperature is maintained at 70°C and the resin is added to the product molding tank via a pump.

[0145] Process 6: Dipping in glue: The fiber yarn is dipped in glue in the molding tank according to the designed direction, and goes through 8 extrusions. Impurities are cleaned regularly during the dipping process.

[0146] Process 7, product molding: Two sets of pre-molding molds are selected, with thicknesses of 5.5mm and 5.3mm respectively, and the molding mold thickness is 5.1mm.

[0147] Step 8: Radiation curing: Use 365nm UV light for curing, with a light intensity of 20J / cm 2 .

[0148] Step 9, thermal curing: Select contact heating method for heat conduction heating, the heating temperatures are 220℃, 200℃ and 180℃ respectively, and heat at 180℃ for 120s to ensure that the resin is completely cured.

[0149] Step 10, cooling: first use 30°C airflow to cool down, then use 10°C airflow to cool down.

[0150] Process 11, traction: The traction speed is controlled at 3m / min to achieve continuous production of products.

[0151] Process 12: Cutting: The product is cut once every 200m in length.

[0152] Process 13: Online inspection: Online inspection of product width, thickness, surface quality, and straightness.

[0153] Process 14: Automatic winding: Winding and winding according to the actual required length.

[0154] Process 15: Automatic unwinding: unwinding, packaging and storage.

[0155] Example 7

[0156] Process 1, yarn loading: Place glass fibers (glass fiber specification: HMG 920HT-2400) with a width of 120 mm, a thickness of 3 mm, and 264 yarn rolls according to the number labels, and merge each fiber yarn in an orderly manner to the end of the yarn loading area according to a specific direction, so that it can be distinguished which yarn roll each fiber yarn comes from.

[0157] Process 2, yarn threading: The neat fiber yarn passes through the tension control regulator, tension detector, fiber dehumidification and heating structure, product forming tank, forming mold, curing structure, traction machine, cutting machine and winder in sequence according to the designed channel.

[0158] Step 3: Adding release cloth: The release cloth passes through the fiber dehumidification and heating structure, the product forming groove, and the forming mold in sequence, and then merges with the fiber yarn to complete the subsequent processes.

[0159] Step 4: Applying tension: Apply tension evenly to all fiber yarns through a tension applying device. The applied tension value is 10N and is controlled within ±3N of the designed value.

[0160] Process 5, tension detection: Regularly detect the tension value of the fiber yarn, the time interval of regular detection is 12 hours, and ensure that the actual tension value of each fiber yarn is within the set range during the production process.

[0161] Step 6: Dehumidification: The temperature is controlled at 125°C and the heating time is 90 seconds to remove moisture from the surface of the fiber yarn and the release cloth during the production process.

[0162] Step 7: Adding resin: The resin temperature is maintained at 60°C and the resin is added to the product molding tank via a pump.

[0163] Process 8: Dipping in glue: The fiber yarn and the demoulding cloth are dipped in glue in the molding tank according to the designed direction, and go through 6 extrusions. Impurities are cleaned regularly during the dipping process.

[0164] Process 9, product molding: Two sets of pre-molding molds are selected, with thicknesses of 3.5mm and 3.3mm respectively, and the molding mold thickness is 3.1mm.

[0165] Step 10: Radiation curing: Use 365nm UV light for curing, with a light intensity of 15J / cm 2 .

[0166] Step 11, thermal curing: contact heating is used for heat conduction heating. The heating temperatures are 220°C, 200°C and 180°C respectively. Heat at 180°C for 120s to ensure that the resin is completely cured.

[0167] Step 12: Cooling: First use 35°C airflow to cool down, then use 15°C airflow to cool down.

[0168] Process 13, traction: The traction speed is controlled at 5m / min to achieve continuous production of products.

[0169] Process 14: Cutting: The product is cut once every 200m in length.

[0170] Process 15: Online inspection: Online inspection of product width, thickness, surface quality, and straightness.

[0171] Process 16: Automatic winding: Winding and winding according to the actual required length.

[0172] Process 17: Automatic unwinding: unwinding, packaging and storage.

[0173] Example 8

[0174] Process 1, yarn loading: Place glass fibers (glass fiber specification: HMG 920HT-2400) with a width of 120 mm, a thickness of 3 mm, and 284 yarn rolls according to the number labels, and merge each fiber yarn in an orderly manner to the end of the yarn loading area according to a specific direction, so that it can be distinguished which yarn roll each fiber yarn comes from.

[0175] Process 2, yarn threading: The neat fiber yarn passes through the tension control regulator, tension detector, fiber dehumidification and heating structure, product forming tank, forming mold, curing structure, traction machine, cutting machine and winder in sequence according to the designed channel.

[0176] Step 3, applying tension: Apply tension evenly to all fiber yarns through a tension applying device, the applied tension value is 10N, and is controlled within ±3N of the design value.

[0177] Process 4: Tension detection: Regularly detect the tension value of the fiber yarn. The time interval for regular detection is 12 hours. During the production process, ensure that the actual tension value of each fiber yarn is within the set range.

[0178] Process 5, dehumidification: the temperature is controlled at 120°C, the heating time is 95s, and the moisture on the surface of the fiber yarn is removed during the production process.

[0179] Step 6: Adding resin: The resin temperature is maintained at 55°C and the resin is added to the product molding tank via a pump.

[0180] Process 7: Dipping in glue: The fiber yarn and the demoulding cloth are dipped in glue in the molding tank according to the designed direction, and go through 6 extrusions. Impurities are cleaned regularly during the dipping process.

[0181] Process 8, product molding: Two sets of pre-molding molds are selected, with thicknesses of 3.5mm and 3.3mm respectively, and the molding mold thickness is 3.1mm.

[0182] Step 9: Radiation curing: Use 365nm UV light for curing, with a light intensity of 15J / cm 2 .

[0183] Step 10, thermal curing: Select contact heating method for heat conduction heating, the heating temperatures are 220℃, 200℃ and 180℃ respectively, and heat at 180℃ for 120s to ensure that the resin is completely cured.

[0184] Step 11, cooling: first use 35°C airflow to cool down, then use 15°C airflow to cool down.

[0185] Process 12, traction: The traction speed is controlled at 5m / min to achieve continuous production of products.

[0186] Process 13: Cutting: The product is cut once every 200m in length.

[0187] Process 14: Online inspection: Online inspection of product width, thickness, surface quality, and straightness.

[0188] Process 15: Automatic winding: Winding and winding according to the actual required length.

[0189] Process 16: Automatic unwinding: unwinding, packaging and storage.

[0190] Example 9

[0191] Process 1, yarn loading: Place glass fibers (glass fiber specification: HMG 920HT-2400) with a width of 120 mm, a thickness of 3 mm, and 284 yarn rolls according to the number labels, and merge each fiber yarn in an orderly manner to the end of the yarn loading area according to a specific direction, so that it can be distinguished which yarn roll each fiber yarn comes from.

[0192] Process 2, yarn threading: The neat fiber yarn passes through the tension control regulator, tension detector, product forming groove, forming mold, curing structure, traction machine, cutting machine and winder in sequence according to the designed channel.

[0193] Step 3, applying tension: Apply tension evenly to all fiber yarns through a tension applying device, the applied tension value is 10N, and is controlled within ±3N of the design value.

[0194] Process 4: Tension detection: Regularly detect the tension value of the fiber yarn. The time interval for regular detection is 12.5 hours. During the production process, ensure that the actual tension value of each fiber yarn is within the set range.

[0195] Step 5: Adding resin: The resin temperature is maintained at 65°C and the resin is added to the product molding tank via a pump.

[0196] Process 6: Dipping in glue: The fiber yarn is dipped in glue in the molding tank according to the designed direction, and goes through 8 extrusions. Impurities are cleaned regularly during the dipping process.

[0197] Process 7, product molding: Two sets of pre-molding molds are selected, with thicknesses of 3.5mm and 3.3mm respectively, and the molding mold thickness is 3.1mm.

[0198] Step 8: Radiation curing: Use 365nm UV light for curing, with a light intensity of 15J / cm 2 .

[0199] Step 9, thermal curing: Select contact heating method for heat conduction heating, the heating temperatures are 220℃, 200℃ and 180℃ respectively, and heat at 180℃ for 120s to ensure that the resin is completely cured.

[0200] Step 10: Cooling: First use 40°C airflow to cool down, then use 20°C airflow to cool down.

[0201] Process 11, traction: The traction speed is controlled at 5m / min to achieve continuous production of products.

[0202] Process 12: Cutting: The product is cut once every 200m in length.

[0203] Process 13: Online inspection: Online inspection of product width, thickness, surface quality, and straightness.

[0204] Process 14: Automatic winding: Winding and winding according to the actual required length.

[0205] Process 15: Automatic unwinding: unwinding, packaging and storage.

[0206] The preparation method of the present invention realizes rapid prototyping of products through a dual curing process combining ultraviolet radiation curing and thermal curing, which makes up for the shortcomings of slow prototyping speed of thermal curing process and poor mechanical properties of ultraviolet radiation curing. The ultraviolet radiation curing speed of the present invention is fast, and the resin can be cured within 20ms. Taking a 5mm thick product as an example, the continuous production speed reaches more than 3m / min, which is more than 8 times the production speed of the traditional process. The method of the present invention perfectly combines the advantages of rapid prototyping of radiation curing and excellent mechanical properties of thermal curing, and effectively improves production efficiency.

[0207] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for preparing a wind turbine blade, characterized in that: The steps include: The fiber yarn is sequentially subjected to yarn feeding, yarn threading, tension application, tension detection, resin compounding, resin dipping, product molding, radiation curing, thermal curing, cooling, pulling, cutting, online detection, winding, and unwinding; The fiber yarn is a reinforcing fiber, and the reinforcing fiber comprises aramid, nylon, glass fiber or quartz fiber; The heat curing method is contact heating or convection, and the heat curing is gradient heating, which is high temperature first and then low temperature; the heat curing temperatures are 220°C, 200°C and 180°C respectively, and the heat curing time is ≥60s; The traction speed is 2-5 m / min.

2. The preparation method according to claim 1, characterized in that: The yarn threading is that the fiber yarn passes through the tension control regulator, the tension detector, the product forming groove, the forming mold, the curing structure, the traction machine, and the cutting machine in sequence.

3. The preparation method according to claim 2, characterized in that: The threading also includes passing the fiber yarn through a fiber dehumidification and heating structure and a winding machine, wherein the fiber yarn passes through a tension detector, then passes through the fiber dehumidification and heating structure, passes through a cutting machine, and then passes through the winding machine; After the fiber yarn is threaded, the demoulding cloth is also combined with the fiber yarn. Before the combination, the demoulding cloth passes through the fiber dehumidification and heating structure, the product molding groove, and the molding mold in sequence.

4. The preparation method according to claim 2 or 3, characterized in that: The applied tension value is 7 to 13N; the tension detection includes online real-time detection and timed detection, and the time interval of the timed detection is 11 to 13h.

5. The preparation method according to claim 4, characterized in that: After the tension is tested, dehumidification is also included. The dehumidification temperature is 100-130°C and the dehumidification time is ≥60s.

6. The preparation method according to claim 1 or 5, characterized in that: Before compounding with the resin, the temperature of the resin is 40-70°C, and the resin is added to the product molding tank; The dipping is carried out by extrusion through the holes or the dividing rods, and the number of extrusion passes is 4 to 8.

7. The preparation method according to claim 6, characterized in that: The product molding includes pre-molding and molding, the pre-molding molds are 1 to 3 groups, and the molding molds are 1 group.

8. The preparation method according to claim 7, characterized in that: The radiation curing is ultraviolet curing, and the light intensity is 12-22 J / cm 2 The cooling is air flow gradient cooling, and the air flow temperature is 30-40°C and 5-20°C successively.

9. The preparation method according to claim 7 or 8, characterized in that: The cutting length is 180 to 220 m; the online inspection items include surface quality, product size and straightness.

10. The wind turbine blade prepared by the preparation method according to any one of claims 1 to 9, characterized in that: The cross-sectional shape of the blade is rectangular, circular or polygonal with arc.