A shaping device for curved carbon fiber pultruded plates

Abstract

This utility model discloses a shaping device for curved carbon fiber pultruded plates, including an upper support, a lower support, and several guide wheel units. Multiple sets of guide wheel units are arranged in rows and columns facing each other on the upper and lower supports, forming a shaping channel between the upper and lower guide wheel units. Each guide wheel unit has height-adjustable guide wheels, with the heights of multiple guide wheels in the same row and column each curvilinearly distributed. This utility model provides row and column-distributed guide wheel units on both the upper and lower supports, and the combined upper and lower units apply deformation control to the pultruded plate. Furthermore, multiple guide wheel units in each row and column can freely translate and rise and fall. Through the five pairs of guide wheel sets combined upper and lower, multi-point curvature control is achieved in the length and width directions of the pultruded plate.

Description

Technical Field

[0001] This utility model relates to the field of curved pultruded sheet technology, and in particular to a shaping device for carbon fiber curved pultruded sheets. Background Technology

[0002] Wind power generation is a power generation technology that uses large blades to convert wind energy into electrical energy. With the development of technology, the demand for single-unit power generation is increasing, the blade size is getting larger, and the requirements for blade strength and stiffness are also getting higher. Large blades with carbon fiber pultruded plates stacked on the main beam cap have become the mainstream technology at present.

[0003] Currently, the commonly used pultruded sheets for wind turbine blade main beam caps, whether made of glass fiber or carbon fiber, have a flat surface and a generally rectangular cross-section. Some pultruded sheets have beveled edges at the four corners of the rectangle, creating chamfered or rounded corners. While this standardized pultruded sheet design facilitates centralized production, packaging, and transportation, it creates numerous uneven gaps during main beam cap stacking due to the mismatch between the flat pultruded sheets and the curved skin surface. After resin injection, these gaps form resin concentration areas, which become weak points under blade load and fail first, leading to blade damage. Furthermore, because the pultruded sheets are not conformal to the blade, the main beam load cannot be evenly distributed to each pultruded sheet when the blade is under load, causing stress concentration inside the main beam cap and preventing the effective utilization of the strength and stiffness advantages of the carbon fiber pultruded sheets.

[0004] CN218953481U discloses a carbon fiber curved pultruded plate and a main beam cap, including a pultruded plate body with a curved structure, curved in both the cross-sectional and length directions; the main beam cap is composed of multiple stacked pultruded plates, the length and curvature of which vary uniformly along the stacking direction, and the gap height between adjacent pultruded plates is consistent. The main beam cap formed by these stacked pultruded plates can conformally fit with the blade skin, and the gap between the main beam cap and the blade skin is uniform. Under load, each pultruded plate and its internal carbon fibers can uniformly bear the load of the main beam, thus avoiding stress concentration. However, during the processing of the curved pultruded plate, the uniform variation of the length and curvature of the pultruded plate along the stacking direction results in high precision requirements and significant production difficulties. Utility Model Content

[0005] To address the aforementioned issues, this invention provides a carbon fiber curved pultruded sheet forming device, which enables the production of carbon fiber curved pultruded sheets and reduces production difficulty.

[0006] Therefore, the technical solution of this utility model is: a carbon fiber curved pultruded plate shaping device, including an upper support, a lower support and several guide wheel units, wherein multiple sets of guide wheel units are arranged in rows and columns facing each other on the upper and lower supports, and a shaping channel is formed between the upper and lower guide wheel units; the guide wheel unit is provided with height-adjustable guide wheels, and the heights of multiple guide wheels in the same row and column are respectively distributed in a curved manner.

[0007] Based on the above scheme and as a preferred embodiment of the above scheme: the height of multiple guide rollers in the same column matches the curvature in the width direction of the corresponding pultruded plate; the height of multiple guide rollers in the same row matches the curvature in the length direction of the corresponding pultruded plate.

[0008] Based on the above scheme and as a preferred embodiment of the above scheme: the upper support and the lower support are provided with a first air jet at the entrance, and the first air jet is connected to a hot air source; the upper support and the lower support are provided with a second air jet at the exit, and the second air jet is connected to a cold air source.

[0009] Based on the above scheme and as a preferred embodiment of the above scheme: the guide wheel unit includes a base, a guide wheel rod, an adjusting nut, and a guide wheel. The base is provided with a through hole for the guide wheel rod to pass through. The adjusting nut is rotatably installed above the base and is threadedly engaged with the guide wheel rod. The guide wheel is rotatably installed at the bottom end of the guide wheel rod.

[0010] Based on the above scheme and as a preferred embodiment of the above scheme: the upper support and the lower support are provided with multiple parallel guide rails, the base is movably mounted on the guide rails and can move along the guide rails; the base is provided with locking bolts, which can be fixedly connected to the guide rails.

[0011] Based on the above scheme and as a preferred embodiment of the above scheme: the guide wheel rod is provided with a scale surface, and the scale surface is provided with scale values.

[0012] Based on the above scheme and as a preferred embodiment of the above scheme: each row of the upper and lower supports has 3 to 5 guide wheel units, and each column has 3 to 5 guide wheel units.

[0013] The production steps are as follows:

[0014] 1) Pre-adjustment of the shaping device: Adjust the height of each guide roller in each column according to the curvature requirements in the width direction of the pultruded plate; adjust the height of each guide roller in each row according to the curvature requirements in the length direction of the pultruded plate; the height of each guide roller is controlled according to the curvature of the pultruded plate analyzed by the computer to realize the curvature change of the mathematical model of the composite main beam cap;

[0015] 2) Preparation of pultruded sheet semi-finished products: Through yarn arrangement, resin impregnation, preforming, and heat curing processes, straight pultruded sheet blanks are obtained; the temperature of the oven is 5 to 30°C higher than the glass transition temperature of the material.

[0016] 3) After the pultruded sheet exits the molding die, it is first cooled and then sent to the drying oven via the overheating traction mechanism;

[0017] 4) After the pultruded sheet comes out of the oven, it enters the forming device. The pultruded sheet enters from the inlet of the forming device and is squeezed by the guide rollers on the upper and lower supports, thereby forming the curved surface of the pultruded sheet. The first air jet at the inlet of the forming device is directly connected to the oven and provides hot air to the pultruded sheet to maintain heating. The second air jet at the outlet of the forming device is connected to cold air to cool the pultruded sheet after forming.

[0018] 5) Slit-formed curved pultruded sheet.

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] 1. Guide roller units are arranged in rows and columns on the upper and lower supports. The upper and lower supports are combined to apply deformation control to the pultruded plate. The multiple guide roller units in each row can freely translate and lift. Through the five pairs of guide roller groups combined in the upper and lower supports, the curvature can be controlled at multiple points in the length direction of the pultruded plate. The multiple guide rollers in each column can also translate and lift. In the width direction of the pultruded plate, the curvature in the width direction can be controlled by the different upper and lower positions of the guide rollers.

[0021] 2. A hot airflow is installed at the inlet of the forming device to continuously heat the pultruded plate, making it easier to shape; a cold airflow is installed at the outlet of the forming device to cool the curved pultruded plate, making it more efficient to shape. Attached Figure Description

[0022] The following detailed description, in conjunction with the accompanying drawings and embodiments of the present invention, will provide further details.

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is a front view of the structure of this utility model;

[0025] Figure 3 This is a schematic diagram showing the distribution of the parallel guide wheel unit of this utility model;

[0026] Figure 4 This is a schematic diagram showing the distribution of the co-column guide wheel units of this utility model;

[0027] Figure 5 This is a schematic diagram of the guide wheel unit of this utility model.

[0028] The components in the diagram are labeled as follows: upper bracket 1, lower bracket 2, guide wheel unit 3, base 31, guide wheel rod 32, adjusting nut 33, guide wheel 34, scale surface 35, scale value 36, shaping channel 4, guide rail 5, first air nozzle 6, and second air nozzle 7. Detailed Implementation

[0029] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. They should not be construed as limiting the specific protection scope of this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0031] See the attached figures. The carbon fiber curved pultruded plate shaping device described in this embodiment includes an upper support 1, a lower support 2, and several guide wheel units 3. Multiple sets of guide wheel units 3 are arranged facing each other on the upper support 1 and the lower support 2. The guide wheel units 3 are distributed in a 5*5 row and column pattern, that is, each row and each column has 5 guide wheel units 3. The guide wheel units 3 of the upper support 1 and the guide wheel units 3 of the lower support 2 are arranged facing each other, and a shaping channel 4 is formed between the upper and lower guide wheel units 3.

[0032] The guide wheel unit 3 includes a base 31, a guide wheel rod 32, an adjusting nut 33, and a guide wheel 34. The base 31 has a through hole for the guide wheel rod 32 to pass through. The adjusting nut 33 is rotatably mounted on the base 31 and threadedly engaged with the guide wheel rod 32. The guide wheel 34 is rotatably mounted on the bottom end of the guide wheel rod 32. The guide wheel rod 32 has a scale surface 35 with a scale value 36. The through hole on the base 31 can be D-shaped to prevent the guide wheel rod 32 from rotating. Rotating the adjusting nut 33 adjusts the height of the guide wheel 34, and precise adjustment can also be achieved according to the scale value 36.

[0033] The guide wheel 34 can move and change position in the Z direction. By adjusting the position of the five guide wheels 34 in the same row, the curvature in the width direction of the pultruded plate can be controlled. By adjusting the position of the five guide wheel units in the same row on the upper and lower supports, the curvature in the length direction of the pultruded plate can be controlled, thereby achieving the control of the composite surface.

[0034] To meet the production needs of different curved plates, the guide wheel unit can be configured as a movable structure. The upper support 1 and lower support 2 are equipped with five parallel guide rails 5. The base 13 is movably mounted on the guide rails 5 and can move along them. The base 13 is equipped with locking bolts (not shown in the figure) for fixed connection to the guide rails. When the base moves to the desired position, the locking bolts are tightened to fix the base to the guide rails, preventing the guide wheels from shifting.

[0035] The upper support 1 and the lower support 2 are provided with a first air jet 6 at their inlets. The first air jet 6 is connected to a hot air source and can blow out hot air to continuously heat the pultruded plate, making the pultruded plate easier to shape. The upper support 1 and the lower support 2 are provided with a second air jet 7 at their outlets. The second air jet 7 is connected to a cold air source and can blow out cold air to cool the curved pultruded plate, making the pultruded plate more quickly set.

[0036] The production process of the curved pultruded sheet includes the following steps:

[0037] 1) Pre-adjustment of the shaping device: Adjust the height of the five guide rollers in each column according to the curvature requirements in the width direction of the pultruded plate; adjust the height of the five guide rollers in each row according to the curvature requirements in the length direction of the pultruded plate. The height of each guide roller is controlled according to the curvature of the pultruded plate analyzed by the computer, so as to realize the curvature change of the mathematical model of the composite main beam cap.

[0038] 2) Preparation of pultruded sheet semi-finished product: Through yarn arrangement, resin impregnation, preforming and heat curing processes, a straight pultruded sheet blank is obtained; this step is a mature existing technology, so it will not be described in detail.

[0039] 3) After the pultruded sheet exits the molding die, it is first cooled and then sent to the oven by the overheating traction mechanism; the temperature of the oven is 5 to 30°C higher than the glass transition temperature of the material.

[0040] 4) After the pultruded plate comes out of the oven, it enters the shaping device. The pultruded plate enters from the entrance of the shaping device and is squeezed by the guide rollers on the upper and lower supports, thereby forming the curved surface of the pultruded plate. The first air jet at the entrance of the shaping device is directly connected to the oven and provides hot air to the pultruded plate to maintain the heating of the pultruded plate. The second air jet at the exit of the shaping device is connected to cold air to cool the pultruded plate after shaping.

[0041] 5) The formed pultruded sheet is cut by a slitting mechanism to obtain curved pultruded sheet.

[0042] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A shaping device for curved carbon fiber pultruded plates, characterized in that: It includes an upper support, a lower support, and several guide wheel units. Multiple sets of guide wheel units are arranged in rows and columns facing each other on the upper and lower supports, and a shaping channel is formed between the upper and lower guide wheel units. Each guide wheel unit is equipped with height-adjustable guide wheels, and the heights of multiple guide wheels in the same row and column are respectively distributed in a curved manner.

2. The carbon fiber curved pultruded plate shaping device as described in claim 1, characterized in that: The height of multiple guide rollers in the same column matches the curvature in the width direction of the corresponding pultruded plate; the height of multiple guide rollers in the same row matches the curvature in the length direction of the corresponding pultruded plate.

3. The carbon fiber curved pultruded plate shaping device as described in claim 1, characterized in that: The upper and lower supports are provided with a first air jet at their inlets, which is connected to a hot air source; the upper and lower supports are provided with a second air jet at their outlets, which is connected to a cold air source.

4. The carbon fiber curved pultruded plate shaping device as described in claim 1, characterized in that: The guide wheel unit includes a base, a guide wheel rod, an adjusting nut, and a guide wheel. The base has a through hole for the guide wheel rod to pass through. The adjusting nut is rotatably mounted on the top of the base and is threadedly engaged with the guide wheel rod. A guide wheel is rotatably mounted on the bottom end of the guide wheel rod.

5. The carbon fiber curved pultruded plate shaping device as described in claim 4, characterized in that: The upper and lower supports are equipped with multiple parallel guide rails, and the base is movably mounted on the guide rails and can move along the guide rails; the base is equipped with locking bolts, which can be fixedly connected to the guide rails.

6. The carbon fiber curved pultruded plate shaping device as described in claim 4, characterized in that: The guide wheel rod is provided with a scale surface, and the scale surface is provided with scale values.

7. The carbon fiber curved pultruded plate shaping device as described in claim 1, characterized in that: Each row of the upper and lower supports has 3 to 5 guide wheel units, and each column has 3 to 5 guide wheel units.

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