A pultrusion molding apparatus and molding method for carbon fiber prepreg.

Abstract

This invention discloses a pultrusion and compression molding apparatus for carbon fiber prepreg, comprising an unwinding unit, a preforming unit, a hot pressing unit, and a traction cutting unit. The preforming unit is located below the unwinding unit and extends to the hot pressing unit, while the traction cutting unit is located at the rear end of the hot pressing unit. This manufacturing equipment, combining pultrusion and compression molding processes, leverages the high efficiency of pultrusion while effectively improving product strength and reducing porosity through compression molding, thus lowering the probability of surface defects such as depressions. The combination of the preforming and unwinding units shortens the equipment length and reduces manufacturing costs. Furthermore, all process operations are completed at different stages within the same production line. The system supports both manual and PLC automatic control, such as controlling cylinder / pneumatic cylinder movements, pressure, temperature, hot pressing time, and traction speed.

Description

Technical Field

[0001] This invention relates to the field of thermosetting carbon fiber prepreg production equipment, and in particular to a carbon fiber prepreg pultrusion molding apparatus and its molding method. Background Technology

[0002] Prepreg pultrusion is a low-cost automated manufacturing technology for composite materials. It uses prepreg as raw material and manufactures profiles of a certain shape through raw material layup design, preforming, hot pressing pultrusion, and post-curing. It has advantages such as high production efficiency, unlimited product length, low product porosity, and high physical properties.

[0003] In existing technologies, the pultrusion and molding processes of prepreg pultrusion are carried out separately, which cannot guarantee both production efficiency and product strength. In particular, wrinkles are easily generated during the layup process, resulting in unstable product quality.

[0004] In addition, the C-beam prepreg layup design that needs to be processed consists of carbon fiber fabric, unidirectional prepreg, and glass fiber fabric. There are both 90° layups and 0° layups. The preforming device for prepreg pultrusion molding in the existing technology adopts a staged gradient. This structure has the following defects: 1) Each 30° gradient requires a length of about 1m, and it cannot be combined with the unwinding device to increase the overall length of the equipment, resulting in a large footprint and high equipment manufacturing cost; 2) The gradient from 0° to 90° is a gradient of all layups stacked together, which cannot effectively remove gas from each layup and will cause wrinkles. Summary of the Invention

[0005] Purpose of the invention: In order to solve the problems existing in the prior art, the present invention provides a pultrusion and compression molding device and its molding method for carbon fiber prepreg. By combining pultrusion and compression molding processes, the strength of the product is effectively improved and the quality of prepreg pultrusion compression molding is improved while retaining the high efficiency production advantages of pultrusion.

[0006] Technical solution: To achieve the above objectives, the present invention may adopt the following technical solution: a carbon fiber prepreg pultrusion molding device, comprising an unwinding unit, a preforming unit, a hot pressing unit, and a traction cutting unit; the preforming unit is located below the unwinding unit and extends to the hot pressing unit, and the traction cutting unit is located at the rear end of the hot pressing unit.

[0007] Furthermore, the unwinding unit includes N+1 unit units, where N is greater than or equal to 1, and N is the number of layups.

[0008] Furthermore, the unwinding unit includes a fixed base, a fixed bracket, a loading roller, a take-up roller, a guide roller, a correction assembly, a take-up motor, and a tension control mechanism;

[0009] The fixed bracket is mounted on the fixed base and includes a bracket space formed by the bottom plate, side plate one, side plate two and top plate. The take-up motor is located in the bracket space within the fixed bracket and is used to control the operation of the take-up roller and adjust the take-up speed of the release paper.

[0010] The loading cylinder is cylindrical, and its central axis is movably connected to the side plate of the fixed bracket through a flange and can rotate freely with each other, for placing the prepreg roll;

[0011] The take-up roller is cylindrical and is fixedly connected to the side plate of the fixed bracket using a flange and used in conjunction with the feed roller to remove the release paper from the surface of the prepreg and roll it up; there are two take-up rollers, one located above the feed cylinder and the other located on one side below the feed cylinder.

[0012] The guide roller is located below the loading roller; it is fixedly connected to the side plate of the fixed bracket via a flange.

[0013] The correction assembly is located at the lowest outer side of the second side plate of the fixed bracket and is used to adjust the position of the feeding cylinder in the Y-axis direction. It includes a correction servo motor and a correction sensor. The correction servo motor is located on the outer side of the second side plate of the fixed bracket and is connected to the fixed bracket through a flange. The correction sensor is located at the free end of the guide roller.

[0014] When the prepreg passes through the guide roller, if the correction sensor detects that the prepreg is misaligned, the correction servo motor will automatically work to correct the position of the prepreg in the Y-axis direction; the tension control mechanism is located on the side of the fixed bracket and bolted to the fixed bracket, and is used for tension control during the operation of the unwinding unit.

[0015] Furthermore, the preforming unit includes a preforming fixed base plate, a preforming sheet metal, a sheet metal bracket, a guide forming mold, and a guide forming mold bracket;

[0016] The sheet metal supports are in multiple sets, arranged in parallel at intervals on the pre-forming fixed base plate. The pre-forming fixed base plate is also provided with a guide forming mold support for the guide forming mold. The guide forming mold is a C-shaped structure and is fixedly connected to the guide forming mold support. There is a layup structure between the guide forming mold and the sheet metal supports. The layup structure gradually changes from a flat plate to a C-shaped pre-formed sheet metal along the horizontal direction through the forming of the guide forming mold. The pre-formed sheet metal with stacked C-shaped end structures is formed sequentially under the multiple sets of sheet metal supports. The multiple layup structures are designed as symmetrical layup structures, with 90° layup sandwiched between two 0° layup layers.

[0017] Furthermore, the preformed sheet metal is formed using flat metal sheet metal, and the pre-folded structure is welded and fixed to the sheet metal bracket; each set of sheet metal brackets includes two inverted U-shaped brackets perpendicular to the preformed fixing base plate; a horizontally set horizontal beam connects the upper crossbeams of the two U-shaped brackets; each of the two upper crossbeams extends downward to a limiting beam for limiting the preformed sheet metal; the lower end of the limiting beam abuts against the upper surface of the preformed sheet metal; a C-shaped preformed sheet metal structure is formed sequentially below multiple sets of adjacent sheet metal brackets, and each layer of raw material is laid up from bottom to top according to the lay-up design; there are multiple guide forming mold brackets, which are evenly distributed and supported below the guide forming mold, and are fixedly connected to the preformed fixing base plate through connecting flanges.

[0018] Furthermore, the hot pressing unit includes a forming support, a forming mold, a hydraulic press, and a control system; the forming mold is used for the final forming and shaping of the pre-formed product and is located on the forming support; the hydraulic press provides pressure for product shaping and curing; the control system is located at the top of the forming support and above the hydraulic press; according to the speed matching and temperature settings of each stage of the equipment, a reasonable pressing temperature and time are set to ensure that the product curing can reach more than 85% until it is completely cured.

[0019] Furthermore, the forming mold includes an upper mold and a lower mold, and the mold opening and closing are accomplished by two actions: pressing down and lifting, respectively; the hydraulic press includes a cylinder-driven elbow, an upper guide plate, a lower guide plate, a guide column, and a hydraulic cylinder;

[0020] The lower mold is driven by a hydraulic cylinder to extend the elbow joint to ensure the rigidity of the upper and lower positions. The upper and lower molds are fixed on the upper and lower guide plates respectively, and six guide pillars ensure the rigidity of the left and right positions of the upper and lower molds. After the lower mold is formed, the upper mold is pressed down simultaneously by two hydraulic cylinders. The pressure is adjusted to maintain the pressure balance during the pressing process of the upper mold. The mold temperature is provided with three heating zones: front, middle and rear. The heating temperature and power are displayed, set and adjusted according to the process requirements.

[0021] Furthermore, the traction cutting unit includes a control panel, a traction device, and a cutting assembly fixedly connected to the frame; the control panel is used to set specific cutting and traction parameters and actions, and is controlled by a PLC program; the traction device provides traction power for the material roll feeding and edge pre-forming of the entire production line, and the power is realized by the transmission of a servo motor combined with a gear rack, including a cylinder motor assembly and two linear guide rails and a rack fixed on the traction base plate.

[0022] Furthermore, the cylinder motor assembly specifically includes a traction pressing cylinder, a cylinder bracket, a traction guide column, a clamping guide plate, a cylinder end, a clamping lower mold, a traction fixing base plate, a motor end gear, and a servo motor;

[0023] The traction cylinder is fixedly connected to the cylinder bracket, and the cylinder end is fixedly connected to the clamping guide plate. The clamping is fixed on the clamping guide plate, and four guide pillars ensure its vertical movement. The clamping lower mold is fixed below the clamping plate to guide the product forward. All the above devices are fixed to the traction fixed base plate through four guide pillars. The servo motor is fixed on the traction fixed base plate. The cylinder motor assembly is driven by the gear and rack at the lower end of the motor. The traction forward power is provided by the servo motor. When the servo motor starts working, the power is transmitted to the traction base plate by the combination of gear and rack, moving along the linear guide rail.

[0024] The cutting assembly includes a cutting machine pressing cylinder fixedly connected to the cutting machine fixed bracket. The end of the pressing cylinder is fixedly connected to the motor fixed bracket. At the same time, the upper cutting motor is fixedly connected to the motor fixed bracket using a flange. The cutting disc is fixedly installed on the cutting disc fixed shaft. The other end of the fixed shaft and the upper cutting machine end are both fixedly installed with V-belt fixed pulleys. The cutting disc rotation power is driven by the cutting motor to drive the V-belt transmission.

[0025] The lower cutting motor is fixedly connected to the traction base plate, the upper cylinder is fixedly connected to the cylinder fixing bracket, and the lower cutting motor and the upper cylinder are connected through an elbow joint connector.

[0026] The present invention also discloses a molding method for the above-mentioned carbon fiber prepreg pultrusion molding apparatus, comprising the following steps:

[0027] (1) The prepreg roll is installed in the unwinding unit in a preset order and a release cloth is placed on its upper and lower surfaces to form a preliminary lay-up structure, and then it is conveyed to the preforming unit.

[0028] (2) The preliminary layup structure is gradually bent and deformed from a flat state to the required profile cross-sectional shape in the preforming unit and then transported to the hot pressing unit;

[0029] (3) The prepreg ply structure with a certain profile cross-sectional shape is heated and pressurized in the hot pressing unit for curing.

[0030] (4) The cured profile is taken out of the hot press mold by the traction cutting unit. The traction cutting unit also takes the uncured prepreg layer structure into the hot press mold to cut the product to the required length.

[0031] Beneficial effects: This invention has the following advantages:

[0032] 1) The manufacturing equipment that combines pultrusion and molding processes not only has the advantages of high-efficiency pultrusion production, but also effectively improves the strength of the product and reduces the porosity of the product through molding, while also reducing the probability of defects such as surface depressions.

[0033] 2) The preforming unit adopts a symmetrical layup design. During the production process, the 90° layup cannot withstand the tension generated by pultrusion. By adopting a symmetrical structure, the 90° layup is sandwiched between two 0° layups, which effectively offsets the tension of the 90° layup. The prepreg layup is gradually changed from 0° to 90°. The product is folded gradually, which effectively removes the gas in the middle of the layup. At the same time, the gradual folding prevents the occurrence of layup wrinkles.

[0034] 3) The combination of the preforming unit and the unwinding unit shortens the equipment length and reduces the equipment manufacturing cost.

[0035] 4) All process operations of this invention are completed in different steps on the same production line. The control system can realize manual and PLC automatic control, such as controlling the action of hydraulic / pneumatic cylinders, pressure, temperature, hot pressing time, traction speed, etc. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the carbon fiber prepreg pultrusion molding device of the present invention;

[0037] Figure 2 This is a schematic diagram of the unwinding unit roller structure of the present invention;

[0038] Figure 3 This is a schematic diagram of the unwinding unit motor and the correction structure of the present invention;

[0039] Figure 4 This is a schematic diagram of the preformed unit structure of the present invention;

[0040] Figure 5 This is a schematic diagram of the preformed sheet metal structure of the preformed unit of the present invention;

[0041] Figure 6 This is a schematic diagram of the preforming unit guide molding mold support structure of the present invention;

[0042] Figure 7 This is a schematic diagram of the overall structure of the hot pressing molding unit of the present invention;

[0043] Figure 8 This is a schematic diagram of the molding die structure of the hot pressing molding unit of the present invention;

[0044] Figure 9 This is a schematic diagram of the hot pressing press structure of the hot pressing forming unit of the present invention;

[0045] Figure 10This is a schematic diagram of the post-curing unit structure of the present invention;

[0046] Figure 11 This is a schematic diagram of the internal structure of the post-curing unit of the present invention;

[0047] Figure 12 This is a schematic diagram of the cooling unit structure of the present invention;

[0048] Figure 13 This is a schematic diagram of the overall structure of the traction cutting unit of the present invention;

[0049] Figure 14 This is a schematic diagram of the working state structure of the traction cutting unit traction device of the present invention;

[0050] Figure 15 This is a schematic diagram of the cylinder motor assembly structure of the traction device of the traction cutting unit of the present invention;

[0051] Figure 16 This is a schematic diagram of the cutting component structure of the traction cutting unit of the present invention;

[0052] Figure 17 This is a schematic diagram of the principle structure of the cutting cylinder motor of the traction cutting unit of the present invention. Detailed Implementation

[0053] Example 1:

[0054] Please see Figure 1-17 As shown, the present invention discloses a carbon fiber prepreg pultrusion molding device, which includes an unwinding unit 1, a preforming unit 2, a hot pressing unit 3, a post-curing unit 4, a cooling unit 5, and a traction cutting unit 6 arranged in sequence.

[0055] The unwinding unit 1 includes N+1 unit units, where N is greater than or equal to 1 and N is the number of layers.

[0056] The unwinding unit 1 includes a fixed base 11, a fixed bracket 12, a loading roller 13, a take-up roller 14, a guide roller 15, a correction assembly 16, a take-up motor 17, and a tension control mechanism 18.

[0057] The fixed bracket 12 is mounted on the fixed base 11 and includes a bracket space formed by the bottom plate, side plate one, side plate two and top plate. The take-up motor 17 is mounted in the bracket space within the fixed bracket 12 and is used to control the operation of the take-up roller 14 and adjust the take-up speed of the release paper.

[0058] The loading cylinder 13 is cylindrical, and its central axis is movably connected to the side plate of the fixed bracket 12 through a flange and can rotate freely with each other, for placing the prepreg roll 19.

[0059] The take-up roller 14 is cylindrical and is fixedly connected to the side plate of the fixed bracket 12 using a flange and is used in conjunction with the loading roller 13 to remove the release paper from the surface of the prepreg and roll it up; there are two take-up rollers 14, one located above the loading roller 13 and the other located on one side below the loading roller 13.

[0060] The guide roller 15 is located below the loading roller 13; it is fixedly connected to the side plate of the fixed bracket 12 via a flange.

[0061] The correction assembly 16 is located at the lowest outer side of the second side plate of the fixed bracket 12 and is used to adjust the position of the feeding cylinder in the Y-axis direction. It includes a correction servo motor 161 and a correction sensor 162. The correction servo motor 161 is located on the outer side of the second side plate of the fixed bracket 12 and is connected to the fixed bracket 12 through a flange. The correction sensor 162 is located at the free end of the guide roller 15.

[0062] When the prepreg roll 19 passes through the guide roller 15, if the correction sensor 162 senses that the prepreg is misaligned, the correction servo motor 161 will automatically work to correct the position of the prepreg in the Y-axis direction.

[0063] The tension control mechanism 18 is located on the side of the fixed bracket 12 and bolted to the fixed bracket 12, and is used for tension control during the operation of the unwinding unit 1.

[0064] The preforming unit 2 includes a preforming fixed base plate 21, a preforming sheet metal 22, a sheet metal bracket 23, a guide forming mold 24, and a guide forming mold bracket 25.

[0065] The sheet metal supports 23 are in multiple sets, standing parallel to each other on the pre-forming fixed base plate 21 at intervals. The pre-forming fixed base plate 21 is also provided with a guide forming mold support 25 to support the guide forming mold 24. The guide forming mold 24 has a C-shaped structure and is fixedly connected to the guide forming mold support 25. There is a lay-up structure between the guide forming mold 24 and the sheet metal supports 23. The lay-up structure gradually changes from a flat plate to a C-shaped pre-formed sheet metal 22 in the horizontal direction through the forming of the guide forming mold 24. The multiple sets of sheet metal supports 23 are arranged adjacently to form a stacked C-shaped pre-formed sheet metal 22. The multiple lay-up structures are designed as symmetrical lay-up structures, with 90° lay-up sandwiched between two 0° lay-up layers.

[0066] The preformed sheet metal 22 is formed using sheet metal flat plates, and the layered structure is pre-folded and welded to the sheet metal bracket 23 for fixation. Each set of sheet metal brackets 23 includes two inverted U-shaped brackets 231 perpendicular to the preformed fixed base plate 21. A horizontally set horizontal beam 233 is connected between the upper crossbeams 232 of the two U-shaped brackets 231. Each of the two upper crossbeams 232 extends downward to provide a limiting beam 234 for limiting the preformed sheet metal 22. The lower end of the limiting beam 234 abuts against the upper surface of the preformed sheet metal 22. The preformed sheet metal 22 with a stacked C-shaped structure is formed under the multiple sets of sheet metal brackets 23 arranged adjacently. According to the layering design, each layer of raw material is laid up in order from bottom to top. There are multiple guide forming mold brackets 25, which are evenly distributed and supported under the guide forming mold 24 and are fixedly connected to the preformed fixed base plate 21 through connecting flanges.

[0067] The hot pressing molding unit 3 includes a molding support 31, a molding die, a hydraulic press, and a control system 34. The molding die is used for the final molding and shaping of the pre-molded product and is located on the molding support 31. The hydraulic press provides pressure for product shaping and curing. The control system 34 is located at the top of the molding support 31 and above the hydraulic press. According to the speed matching and temperature setting of each stage of the equipment, a reasonable pressing temperature and time are set to ensure that the product curing can reach more than 85% until it is completely cured.

[0068] The forming mold includes an upper mold 321 and a lower mold 322. The mold opening and closing are accomplished by two actions: pressing down and lifting, respectively. The hydraulic press includes a cylinder-driven elbow 331, an upper guide plate 332, a lower guide plate 333, a guide 334, and a hydraulic cylinder 335.

[0069] The lower mold 322 is straightened by the hydraulic cylinder driven elbow 331 to ensure the rigidity of the upper and lower positions of the lower mold 322. The upper mold 321 and the lower mold 322 are fixed on the upper guide plate 332 and the lower guide plate 333 respectively. The rigidity of the left and right positions of the upper and lower molds is ensured by six guide pillars 334. After the lower mold 322 is formed, the upper mold 321 is pressed down simultaneously by two hydraulic cylinders 335. The pressure is adjusted to maintain the pressure balance during the pressing of the upper mold 321. The mold temperature is provided with three heating zones: front, middle and rear. The heating temperature and power are displayed, set and adjusted according to the process requirements.

[0070] The post-curing unit 4 is used to perform secondary curing on the hot-pressed product, and includes an oven cover 41, an oven body 42, a heating tube 43, a heating tube support 44, and a guide mold core 45.

[0071] The oven cover 41 and the oven body 42 are connected by a hinge. The oven body 42 is equipped with a heating tube 43, which heats and cures the product. The heating tube bracket 44 is fixedly connected to the oven cover to support the heating tube 43. The guide mold core 45 is fixedly installed on the oven body 42 to guide and position the product as it passes through the oven body 42.

[0072] The cooling unit 5 includes an air-cooling assembly 51, an air-cooling chassis, and a shaping lower mold. The air-cooling chassis includes a chassis cover 52 and a chassis body 53, which are connected by hinges.

[0073] The air-cooling component 51 is fixed on the upper cover 52 of the chassis and is used to improve or reduce the cooling effect. The air-cooling component 51 uses modular components and the number is adjustable. The shaping lower mold is fixedly connected to the chassis body 53. During the air-cooling process of the product, the shaping lower mold is the inner core to minimize the deformation of the product caused by cooling.

[0074] The traction cutting unit 6 includes a control panel 61, a traction device 62, and a cutting assembly 63, which are fixedly connected to the frame 64.

[0075] The control panel 61 is used to set specific parameters and actions for cutting and traction, and is controlled by a PLC program.

[0076] The traction device 62 provides traction power for the material roll feeding and edge folding pre-forming of the entire production line. The power is achieved by the transmission of a servo motor combined with a gear rack, including a cylinder motor assembly and two linear guide rails 6211 and a rack 6212 fixed on the traction base plate 6213.

[0077] The cylinder motor assembly specifically includes a traction pressing cylinder 621, a cylinder bracket 622, a traction guide column 624, a clamping guide plate 625, a cylinder end 626, a clamping lower mold 627, a traction fixing base plate 628, a motor end gear 629, and a servo motor 6210.

[0078] The traction pressing cylinder 621 is fixedly connected to the cylinder bracket 622, and the cylinder end 626 is fixedly connected to the clamping guide plate 625. The clamping is fixed on the clamping guide plate 625, and its vertical movement is ensured by four guide pillars 624. The clamping lower mold 627 is fixed below the clamping unit to guide the product forward. All the above devices are fixed to the traction fixing base plate 628 by the four guide pillars 624. The servo motor 6210 is fixed to the traction fixing base plate 628. The cylinder motor assembly is driven by the gear 629 and rack 6212 at the lower end of the motor. The traction forward power is provided by the servo motor 6210. When the servo motor starts to work, the power is transmitted to the traction base plate 6213 by the gear and rack 6212, moving along the linear guide rail.

[0079] The cutting assembly 63 starts working and cuts the product after the product length reaches the set length. It includes a cutting machine pressing cylinder 631 fixedly connected to the cutting machine fixed bracket 632, and a motor fixed bracket 633 fixedly connected to the end of the pressing cylinder. At the same time, the upper cutting motor 638 is fixedly connected to the motor fixed bracket 633 using a flange. The cutting blade 636 is fixedly installed on the cutting blade fixed shaft 6313. The other end of the fixed shaft and the upper cutting machine end are both fixedly installed with V-belt fixed pulleys 6312. The cutting blade rotation is driven by the cutting motor through the V-belt transmission.

[0080] The lower cutting motor 639 is fixedly connected to the traction base plate 6213, and the upper lifting cylinder 6311 is fixedly connected to the cylinder fixing bracket 6310. The lower cutting motor 639 and the upper lifting cylinder 6311 are connected through the elbow joint connector 6314. When the product reaches the cutting length, the front clamp 635 and the rear clamp 634 press down simultaneously to fix the product position. The lowering cylinder 631 starts to work and moves downward, while the upper lifting cylinder 6311 moves upward. The upper cutting motor 638 and the lower cutting motor 639 start to work, driving the blade to rotate and cutting the product.

[0081] The molding method of the above-mentioned device works as follows:

[0082] 1) According to the product layup design, install the prepreg rolls sequentially onto the loading roller 13, remove the release paper from the top and bottom surfaces of each roll, and fix the release paper to the take-up roller 14; the roll position is centered; adjust the tension control mechanism according to process requirements to ensure that the raw material has a certain tension during operation. When the prepreg roll 19 passes through the guide roller 15, if the correction sensor 162 senses that the prepreg position is off-center, the correction servo motor 161 will automatically work to correct the prepreg position in the Y-axis direction.

[0083] 2) The raw materials prepared in the unwinding unit 1 are sequentially passed through the C-beam carbon fiber prepreg preforming device and the forming mold in the order from bottom to top according to the layup design, and then brought out of the hot pressing mold and entered the hot pressing forming unit 3 for the next step of processing.

[0084] 3) One hour before proceeding with steps 1-2, turn on the mold temperature according to the process requirements, start the traction button and release paper take-up motor, and the prepreg layup structure will begin to move forward. Observe the running status of the prepreg blank. When the layup is running normally and there are no wrinkles on the surface, press the mold pressing switch. Set the holding time through the control panel. After the holding time is reached, the mold will automatically lift up, and the traction will start to carry the cured product out of the hot press mold and bring the pre-formed layup structure into the hot press mold. The mold will then press down to start the next cycle.

[0085] 4) When the cured products arrive at the post-curing oven, turn on the oven temperature and cooling fan in sequence through the control panel;

[0086] 5) When the product reaches the required length, the cutting device will automatically cut the product.

Claims

1. A pultrusion molding apparatus for carbon fiber prepreg, characterized in that... It includes an unwinding unit, a preforming unit, a hot pressing unit, and a traction cutting unit; the preforming unit is located below the unwinding unit and extends to the hot pressing unit, and the traction cutting unit is located at the rear end of the hot pressing unit. The preforming unit includes a preforming fixed base plate, a preforming sheet metal, a sheet metal bracket, a guide forming mold, and a guide forming mold bracket. The sheet metal supports are in multiple sets, arranged in parallel at intervals on the pre-forming fixed base plate. The pre-forming fixed base plate is also provided with a guide forming mold support for supporting the guide forming mold. The guide forming mold is a C-shaped structure and is fixedly connected to the guide forming mold support. There is a layup structure between the guide forming mold and the sheet metal supports. The layup structure gradually changes from a flat plate to a C-shaped pre-formed sheet metal along the horizontal direction through the forming of the guide forming mold. The pre-formed sheet metal with stacked C-shaped end structures is formed sequentially under the multiple sets of sheet metal supports. The multiple layup structures are designed as symmetrical layup structures, with 90° layup sandwiched between two 0° layup layers. In the hot pressing unit, the mold temperature is provided with three heating zones: front, middle and rear. The heating temperature and power are displayed, set and adjusted according to the process requirements. The traction cutting unit includes a synchronously controlled traction device and a cutting component. The traction device adopts a servo motor combined with a gear and rack transmission. The preformed sheet metal is formed using sheet metal flat plates, and the layered structure is pre-folded and welded to the sheet metal brackets for fixation. Each set of sheet metal brackets includes two inverted U-shaped brackets perpendicular to the preformed fixing base plate. A horizontal beam is connected between the upper crossbeams of the two U-shaped brackets. Each of the two upper crossbeams extends downward to a limiting beam that limits the preformed sheet metal. The lower end of the limiting beam abuts against the upper surface of the preformed sheet metal. Multiple sets of sheet metal brackets arranged adjacently form a stacked C-shaped preformed sheet metal structure below, and each layer of raw material is laid up from bottom to top according to the layering design. There are multiple guide forming mold brackets, which are evenly distributed and supported below the guide forming mold, and are fixedly connected to the preformed fixing base plate through connecting flanges.

2. The carbon fiber prepreg pultrusion molding apparatus according to claim 1, characterized in that: The unwinding unit comprises N+1 unit units, where N is greater than or equal to 1, and N is the number of layers.

3. The carbon fiber prepreg pultrusion molding apparatus according to claim 1 or 2, characterized in that: The unwinding unit includes a fixed base, a fixed bracket, a loading roller, a take-up roller, a guide roller, a correction assembly, a take-up motor, and a tension control mechanism. The fixed bracket is mounted on the fixed base and includes a bracket space formed by the bottom plate, side plate one, side plate two and top plate. The take-up motor is located in the bracket space within the fixed bracket and is used to control the operation of the take-up roller and adjust the take-up speed of the release paper. The loading roller is cylindrical, and its central axis is movably connected to the side plate of the fixed bracket through a flange and can rotate freely with each other, for placing the prepreg roll; The take-up roller is cylindrical and is fixedly connected to the side plate of the fixed bracket using a flange and used in conjunction with the feed roller to remove the release paper from the surface of the prepreg and roll it up; there are two take-up rollers, one located above the feed roller and the other located on one side below the feed roller. The guide roller is located below the loading roller; it is fixedly connected to the side plate of the fixed bracket via a flange. The correction assembly is located at the lowest outer side of the second side plate of the fixed bracket and is used to adjust the position of the feeding cylinder in the Y-axis direction. It includes a correction servo motor and a correction sensor. The correction servo motor is located on the outer side of the second side plate of the fixed bracket and is connected to the fixed bracket through a flange. The correction sensor is located at the free end of the guide roller. When the prepreg passes through the guide roller, the correction sensor detects that the prepreg is misaligned, and the correction servo motor will automatically work to correct the position of the prepreg in the Y-axis direction. The tension control mechanism is located on the side of the fixed bracket and is bolted to the fixed bracket. It is used for tension control when the unwinding unit is running.

4. The carbon fiber prepreg pultrusion molding apparatus according to claim 1, characterized in that: The hot pressing unit includes a forming support, a forming mold, a hydraulic press, and a control system. The forming mold, located on the forming support, is used for the final forming and shaping of the pre-formed product. The hydraulic press provides pressure for product shaping and curing. The control system is located at the top of the forming support and above the hydraulic press. Based on the speed matching and temperature settings of each stage of the equipment, a reasonable pressing temperature and time are set to ensure that the product curing reaches more than 85% until it is completely cured.

5. The carbon fiber prepreg pultrusion molding apparatus according to claim 4, characterized in that: The forming mold includes an upper mold and a lower mold, and the mold opening and closing are accomplished by two actions: pressing down and lifting, respectively; the hydraulic press includes a hydraulic cylinder drive elbow, an upper guide plate, a lower guide plate, a guide column, and a hydraulic cylinder; The lower mold is driven by a hydraulic cylinder to extend the elbow joint to ensure the rigidity of the upper and lower positions. The upper and lower molds are fixed on the upper and lower guide plates respectively, and six guide pillars ensure the rigidity of the left and right positions of the upper and lower molds. After the lower mold is formed, the upper mold is pressed down simultaneously by two hydraulic cylinders. The pressure is adjusted to maintain the pressure balance during the pressing process of the upper mold. The mold temperature is provided with three heating zones: front, middle and rear. The heating temperature and power are displayed, set and adjusted according to the process requirements.

6. The carbon fiber prepreg pultrusion molding apparatus according to claim 1, characterized in that: The traction cutting unit includes a control panel, a traction device, and a cutting assembly fixedly connected to the frame. The control panel is used to set specific cutting and traction parameters and actions, and is controlled by a PLC program. The traction device provides traction power for the material roll feeding and edge pre-forming of the entire production line. The power is achieved by a servo motor combined with a gear rack, including a cylinder motor assembly and two linear guide rails and a rack fixed on the traction base plate.

7. The carbon fiber prepreg pultrusion molding apparatus according to claim 6, characterized in that: The cylinder motor assembly specifically includes a traction pressing cylinder, a cylinder bracket, a traction guide column, a clamping guide plate, a cylinder end, a clamping lower mold, a traction fixing base plate, a motor end gear, and a servo motor. The traction pressing cylinder is fixedly connected to the cylinder bracket, and the cylinder end is fixedly connected to the clamping guide plate. The clamping is fixed on the clamping guide plate, and four guide columns ensure its up and down movement direction. The clamping lower mold is fixed below the clamping unit to guide the product forward. The servo motor is fixed on the traction fixed base plate, and the cylinder motor assembly is driven by the gear and rack at the motor end below. The traction forward power is provided by the servo motor. When the servo motor starts working, the power is transmitted to the traction base plate by the combination of gear and rack, and the plate moves along the linear guide rail. The cutting assembly includes a cutting machine pressing cylinder fixedly connected to the cutting machine fixed bracket. The end of the pressing cylinder is fixedly connected to the motor fixed bracket. At the same time, the upper cutting motor is fixedly connected to the motor fixed bracket using a flange. The cutting disc is fixedly installed on the cutting disc fixed shaft. The other end of the fixed shaft and the upper cutting machine end are both fixedly installed with V-belt fixed pulleys. The cutting disc rotation power is driven by the cutting motor to drive the V-belt transmission. The lower cutting motor is fixedly connected to the traction base plate, and the upper cylinder is fixedly connected to the cylinder fixing bracket. The lower cutting motor and the upper cylinder are connected through an elbow joint connector.

8. A molding method for a carbon fiber prepreg pultrusion molding apparatus according to any one of claims 1-7, characterized in that... Includes the following steps: (1) The prepreg roll is installed in the unwinding unit in a preset order and a release cloth is placed on its upper and lower surfaces to form a preliminary lay-up structure, and then conveyed to the preforming unit. (2) The preliminary layup structure is gradually bent and deformed from a flat state to the required profile cross-sectional shape in the preforming unit and then transported to the hot pressing unit; (3) A prepreg ply structure with a certain profile cross-sectional shape is heated and pressurized in a hot pressing unit for curing. (4) The cured profile is taken out of the hot press mold by the traction cutting unit. The traction cutting unit also takes the uncured prepreg layer structure into the hot press mold to cut the product to the required length.

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