A multi-dimensional pressurized placement device for thermoplastic prepreg

Abstract

The application discloses a thermoplastic prepreg multi-dimensional pressurized placement device and belongs to the field of composite material production. The thermoplastic prepreg multi-dimensional pressurized placement device comprises a shell, and an upper end inside the shell is provided with a placement structure; the placement structure comprises an upper mounting disc and a heating outlet, a first pressing roller, a second pressing roller and a third pressing roller which are sequentially arranged on the upper mounting disc along a placement advancing direction. The application solves the problem that the existing placement device is difficult to completely eliminate the small air bubbles remaining between layers, resulting in a high porosity of the formed component; the first pressing roller and the third pressing roller are configured to maintain a relatively low first temperature, and the second pressing roller is configured to maintain a relatively high second temperature, thereby forming a temperature gradient design of cold, hot and cold, and the quality of the product is significantly improved.

Description

Technical Field

[0001] This invention relates to the field of composite material production, specifically to a multi-dimensional pressure laying device for thermoplastic prepregs. Background Technology

[0002] Thermoplastic prepreg pressure layup equipment is an advanced automated composite material molding equipment. Its core function is to continuously lay prepregs, which are pre-impregnated with thermoplastic resin and high-performance fibers such as carbon fiber, onto the mold surface under precise control. The prepreg is rapidly heated by the layup head and pressure is applied by the pressure rollers, so that it can be cured and shaped in situ while adhering to the mold. This equipment can efficiently manufacture lightweight and high-strength composite material components and realize integrated production from material layup to product molding. Chinese Patent Publication No. CN223890510U discloses a thermoplastic composite material component laying device. The tension unwinding mechanism outputs and lays out thermoplastic prepreg filaments according to a certain guide. The heater heats the output thermoplastic prepreg filaments. The rolling mechanism rolls and consolidates the laid thermoplastic prepreg filaments to form a thermoplastic composite material component. The motion system includes a translation mechanism that can realize three translational degrees of freedom and a rotation mechanism that can realize rotational degrees of freedom. It has high flexibility, efficiency and precision. By using this motion system in conjunction with the laying execution mechanism, the laying execution mechanism can realize multiple degrees of freedom of movement, thereby realizing multi-directional precise and efficient laying and forming actions.

[0003] Although the laying device of the aforementioned patent achieves multi-degree-of-freedom movement and automated laying, its roller pressing mechanism adopts a single pressing method, that is, the heated prepreg is rolled and solidified once by a single pressure roller. This single pressure roller can only compact the prepreg once during the laying process, which makes it difficult to completely eliminate the micro air bubbles remaining between layers. This results in high porosity of the molded component and affects the interlayer bonding strength. Secondly, single pressing cannot perform secondary heat treatment on the laid prepreg, and the micro residual stress generated during the rapid cooling and shaping process is difficult to release effectively, which can easily lead to component deformation or internal stress. Summary of the Invention

[0004] The purpose of this invention is to provide a multi-dimensional pressure laying device for thermoplastic prepregs. By sequentially arranging a first pressing roller, a second pressing roller, and a third pressing roller on the mold along the laying direction, and configuring the first and third pressing rollers to maintain a lower first temperature, while configuring the second pressing roller to maintain a higher second temperature, a temperature gradient design of cold, hot, and cold is formed. Compared with the single-pressing method in the prior art, this invention effectively reduces the porosity of the molded component, improves the interlayer bonding strength, eliminates internal stress, significantly improves the quality of the manufactured part, and solves the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a multi-dimensional pressure laying device for thermoplastic prepreg, comprising a housing, wherein a laying structure is provided at the upper end of the housing, the laying structure comprising an upper mounting plate and a heating output port, a first pressing roller, a second pressing roller and a third pressing roller sequentially arranged on the upper mounting plate along the laying forward direction, the heating output port being used to heat and discharge the prepreg, the first pressing roller and the third pressing roller being configured to maintain a first temperature, the second pressing roller being configured to maintain a second temperature higher than the first temperature, a lower mounting plate being provided at the lower end of the housing, a mold being placed at the upper end of the lower mounting plate, and the prepreg discharged through the heating output port being pressed onto the mold sequentially by the first pressing roller, the second pressing roller and the third pressing roller.

[0006] Preferably, the upper mounting plate is movably mounted on the upper end of the housing via a first movable structure. The first movable structure includes a plurality of rollers disposed on the upper mounting plate, a first movable rail disposed on the inner wall of the housing and cooperating with the rollers, and a first threaded rod threadedly connected to the upper mounting plate and used to drive it to move along the first movable rail.

[0007] Preferably, the lower mounting plate is fixedly connected to the lower end inside the housing.

[0008] Preferably, the upper mounting plate is fixedly connected to the upper end of the housing.

[0009] Preferably, the lower mounting plate is movably mounted inside the lower end of the housing via a second movable structure. The second movable structure includes two third movable rails disposed at the bottom of the housing and a third threaded rod threadedly engaged with the lower mounting plate. The lower mounting plate is slidably embedded inside the third movable rails, and the third threaded rod is used to drive the lower mounting plate to move along the third movable rails.

[0010] Preferably, a cylinder is provided above the first pressing roller, the second pressing roller, the third pressing roller and the heating output port. Each cylinder is fixedly connected to the upper mounting plate through a first connecting frame. Guide rollers are arranged parallel to each other on both sides of the cylinder piston rod. The first connecting frame is provided with movable holes that slide with the guide rollers.

[0011] Preferably, a second connecting frame is provided below the first pressing roller, the second pressing roller, and the third pressing roller. The first pressing roller, the second pressing roller, and the third pressing roller are rotatably mounted on each of the second connecting frames. The upper ends of the second connecting frames and the heating output ports are fixedly connected to each of the guide rollers.

[0012] Preferably, an elastic pressing mechanism is provided between the second connecting frame and the first connecting frame. The elastic pressing mechanism includes three springs, two of which are respectively sleeved on the outside of the two guide rollers and abut against the first connecting frame and the second connecting frame, and the third spring is sleeved on one end of the piston rod of the cylinder and abuts against the cylinder body of the cylinder and the second connecting frame.

[0013] Preferably, each of the springs has a pre-compression amount in the installed state, and when the cylinder drives the pressing roller to press down to the maximum working stroke, the compression amount of each spring is less than its limit compression amount, so that each spring always retains a compression margin.

[0014] Preferably, the first temperature is lower than the melting temperature of the thermoplastic prepreg, and the first temperature is 20-60°C; the second temperature is higher than the first temperature but lower than the thermal decomposition temperature of the thermoplastic prepreg, and the second temperature is 150-200°C.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention, by sequentially arranging a first pressing roller, a second pressing roller, and a third pressing roller on the mold along the laying direction, and configuring the first and third pressing rollers to maintain a lower first temperature, and the second pressing roller to maintain a higher second temperature, forms a temperature gradient design of cold, hot, and cold. This design allows the prepreg to undergo three processes in a single laying stroke: rapid cooling and shaping, secondary heat treatment, and final cooling and shaping. The first pressing roller rapidly cools and solidifies the surface of the molten prepreg, preventing material sagging and deformation and avoiding adhesion. The second pressing roller performs secondary heat treatment on the prepreg after initial shaping, eliminating microscopic residual stress and removing interlayer bubbles. The third pressing roller further cools and shapes the prepreg, ensuring a smooth and flat surface. Compared with the single-pressing method in the prior art, this invention effectively reduces the porosity of the molded component, improves the interlayer bonding strength, eliminates internal stress, and significantly improves the quality of the manufactured part.

[0016] 2. This invention features independent cylinder-driven and guide rollers above the first, second, and third pressing rollers and the heating output port. An elastic pressure mechanism consisting of three springs is also installed between the first and second connecting frames. This allows the first, second, and third pressing rollers to have independent floating functions. Through the design of the spring pre-compression and compression allowance, the first, second, and third pressing rollers can adaptively follow the curvature changes of the mold surface. When encountering a protrusion, the springs further compress to absorb displacement; when encountering a depression, the springs release their elasticity to push the first, second, and third pressing rollers downwards, ensuring that the first, second, and third pressing rollers maintain uniform contact pressure with the prepreg surface. This design makes the invention applicable to various mold laying operations, achieving multi-dimensional and adaptive pressure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall external structure of Embodiment 1 of the present invention; Figure 2 This is a cross-sectional view of the internal structure of Embodiment 1 of the present invention; Figure 3 This is a schematic diagram showing the positional relationship of the first pressing roller of the present invention; Figure 4 This is a schematic diagram showing the positional relationship of the springs in this invention; Figure 5 For the present invention Figure 4 Enlarged view of a portion of region A in the middle; Figure 6 This is an exploded view showing the positional relationship of the fixing strips in this invention; Figure 7 This is a schematic diagram of the overall external structure of Embodiment 2 of the present invention.

[0018] In the diagram: 1. Outer shell; 2. Lower mounting plate; 3. Upper mounting plate; 5. First connecting frame; 6. First pressing roller; 7. Mold; 8. Second pressing roller; 9. Third pressing roller; 10. Heating output port; 11. First threaded rod; 12. First movable rail; 13. Roller; 14. Second connecting frame; 15. Guide roller; 16. Spring; 17. Fixing strip; 18. Cylinder; 19. Second movable rail; 20. Second threaded rod; 21. Third movable rail; 22. Third threaded rod; 23. Infusion tube; 24. Movable hole. Detailed Implementation

[0019] The present invention will be further described below with reference to specific embodiments.

[0020] Example 1, as Figure 1 and Figure 2 As shown, this embodiment of a multi-dimensional pressure laying device for thermoplastic prepreg includes a housing 1. A laying structure is provided at the upper end of the housing 1. The laying structure includes an upper mounting plate 3 and a heating output port 10, a first pressing roller 6, a second pressing roller 8, and a third pressing roller 9, sequentially arranged on the upper mounting plate 3 along the laying forward direction. A lower mounting plate 2 is provided at the lower end of the housing 1, and the upper end of the lower mounting plate 2 is used to place a mold 7.

[0021] For mold 7, the upper surface of mold 7 needs to be cleaned to ensure that there are no impurities such as oil and dust. Then, according to the product demolding requirements, a layer of demolding cloth (not shown in the diagram) can be laid on the upper part of mold 7, or a demolding agent can be evenly coated on the surface of mold 7 to facilitate the separation of the molded components from the mold.

[0022] If a release cloth is used, it should be laid flat on the mold 7 and the edges should be fixed with high-temperature resistant tape to prevent displacement during the laying process. After completing the above preparations, the mold 7 can be placed on the upper end of the lower mounting plate 2 and clamped and fixed. Then, the multi-dimensional pressure laying operation of the thermoplastic prepreg can begin.

[0023] Regarding the fixing of the mold 7, strip-shaped fixing strips 17 are provided at both the front and rear ends of the mold 7. The strip-shaped fixing strips 17 are parallel to the edge of the mold 7. The mold 7 is fixed and restricted by the two fixing strips 17 to prevent the mold 7 from changing position during subsequent pressure laying.

[0024] One of the fixing strips 17 is integrally formed with the upper end of the lower mounting plate 2, while the other fixing strip 17 is designed to be movable, such as... Figure 6 As shown, the lower mounting plate 2 has a second movable rail 19 inside for the movable fixing bar 17, and the lower end of the movable fixing bar 17 slides within the second movable rail 19.

[0025] In order to accurately adjust and change the position of the fixing bar 17, a second threaded rod 20 is provided inside the second movable rail 19 perpendicular to the fixing bar 17. The outside of the second threaded rod 20 passes through and extends to both ends of the movable fixing bar 17, and the outside of the second threaded rod 20 is threadedly engaged with the through position of the fixing bar 17. By adjusting the second threaded rod 20, the position of the fixing bar 17 can be directly controlled, which facilitates the positional change of the fixing bar 17 and the adjustment of the fixing bar 17 to clamp or release the mold 7.

[0026] In this embodiment, the lower end of the lower mounting plate 2 is fixedly connected to the lower end inside the outer casing 1.

[0027] For pressurized laying, a heating output port 10 is provided at the upper end inside the outer shell 1. The thermoplastic prepreg is discharged from the heating output port 10 after being transported and heated.

[0028] It should be noted that the thermoplastic prepreg storage, transmission and heating structure connected to the rear end of the heating output port 10 is not an improvement of this application, and those skilled in the art can achieve it using various conventional technical means.

[0029] As an optional implementation, the rear end of the heating output port 10 is sequentially connected to a conveying wheel, a tension adjustment mechanism, and an unwinding mechanism. The thermoplastic prepreg filaments are wound on the material tray of the unwinding mechanism. After being kept at a constant tension by the tension adjustment mechanism, they are conveyed to the heating output port 10 by the conveying wheel. A heater is provided inside or near the heating output port 10. The heater can be a laser heater, an infrared heater, or a hot air heater, used to rapidly heat the output prepreg to soften or melt it. The above-mentioned conveying, tension control, and heating structures are all mature and conventional technologies in the field of composite material laying. Their specific structures, models, and parameters can be selected and configured according to actual process requirements. This application does not specifically limit them and will not elaborate further.

[0030] One end of the heating output port 10 is sequentially provided with a first pressing roller 6, a second pressing roller 8 and a third pressing roller 9. The material discharged from the heating output port 10 is sequentially pressed by the first pressing roller 6, the second pressing roller 8 and the third pressing roller 9 to complete the required multi-dimensional pressurization and laying.

[0031] It is worth mentioning that the temperature of the first pressing roller 6 and the third pressing roller 9 is lower than the melting temperature of the thermoplastic prepreg, which is the first temperature, while the second pressing roller 8 is configured to maintain a second temperature higher than the first temperature.

[0032] With this temperature design, firstly, the first pressing roller 6, as the roller that first contacts the heated prepreg, has a lower initial temperature that allows the molten prepreg surface to cool and solidify rapidly, playing a role in rapid cooling and shaping. This can prevent the prepreg from sagging or deforming due to gravity during subsequent conveying, maintaining the accuracy of the laying trajectory. Furthermore, the rapidly solidified surface layer can effectively prevent the prepreg from sticking to the first pressing roller 6, ensuring continuous and stable operation of the equipment.

[0033] Secondly, the second pressing roller 8, as an intermediate roller, has a higher second temperature that can perform secondary heat treatment on the prepreg that has been initially shaped by the first pressing roller 6 but has not yet been fully cured. Under this temperature, the resin on the surface of the prepreg softens again and produces local flow, which can effectively eliminate the micro residual stress generated during the rapid cooling process of the first pressing roller 6. At the same time, it can further squeeze out any small air bubbles that may remain between the layers, significantly improving the interlayer bonding strength and the density of the part.

[0034] Finally, the third pressing roller 9 cools and shapes the prepreg that has undergone secondary heat treatment again at the first temperature, so that the surface of the prepreg has a smooth final shape, while ensuring that the material is completely cured and maintains good dimensional stability.

[0035] The first pressing roller 6, the second pressing roller 8, and the third pressing roller 9, through a temperature gradient design of cold, hot, and cold, achieve a triple synergistic effect of rapid cooling and shaping, heat treatment enhancement, and final finishing in a single laying stroke.

[0036] As a preferred embodiment, the first temperature range is 20°C to 60°C. This temperature range can meet the requirements of rapid cooling and shaping without causing the prepreg to become brittle or generating excessive thermal stress due to excessively low temperatures.

[0037] As a preferred embodiment, the second temperature range is 150°C to 200°C. This temperature range is higher than the glass transition temperature of commonly used thermoplastic resins but lower than their thermal decomposition temperature. This can soften the resin while avoiding material degradation and achieve the best secondary heat treatment effect.

[0038] It should be noted that the above temperature range can be adaptively adjusted according to factors such as the specific material of the thermoplastic prepreg being processed, the laying speed, and the ambient temperature. Those skilled in the art can determine the optimal parameters through a limited number of experiments.

[0039] In order to maintain the temperature of the third pressing roller 9 and the first pressing roller 6 at the first temperature, and also to maintain the temperature of the second pressing roller 8 at the second temperature, liquid can be transferred to the inside of the first pressing roller 6, the second pressing roller 8 and the third pressing roller 9 to achieve continuous temperature maintenance.

[0040] The first pressing roller 6, the second pressing roller 8, and the third pressing roller 9 are all equipped with liquid delivery pipes 23 at both ends. The liquid delivery pipes 23 are rotatably and sealed to the two ends of the corresponding pressing rollers, and are used to deliver liquid into the pressing rollers and discharge it from the other end, so as to achieve temperature control of the pressing rollers.

[0041] Among them, room temperature liquid is delivered into the first pressing roller 6 and the third pressing roller 9, and heated oil is delivered into the second pressing roller 8.

[0042] The first pressing roller 6, the second pressing roller 8, and the third pressing roller 9 are respectively rotatably mounted on the corresponding second connecting frame 14 at both ends. When the pressing rollers contact and press the thermoplastic prepreg, they can rotate freely as the material is laid out.

[0043] Because the infusion tube 23 is connected to the pressing roller by a rotary seal, the liquid can still be continuously and stably input and output during the continuous rotation of the pressing roller, ensuring that each pressing roller is kept within the required temperature range.

[0044] It should be noted that this type of rotary sealing connection is a mature and conventional technical means in the field of fluid transportation. This application has not made any improvements to this part of the structure, so it will not be described in detail here.

[0045] Each of the first pressing roller 6, the second pressing roller 8, the third pressing roller 9, and the heating output port 10 is equipped with an independent drive and guide mechanism.

[0046] Specifically, the first pressing roller 6, the second pressing roller 8, and the third pressing roller 9 are respectively installed through the second connecting frame 14, and a first connecting frame 5 that is fixedly connected to the upper mounting plate 3 is provided above each second connecting frame 14 and the heating output port 10.

[0047] A cylinder 18 is fixedly installed on the side of the first connecting frame 5. The piston rod of each cylinder 18 extends vertically downward and acts on the corresponding second connecting frame 14 and heating output port 10. The upper end of the heating output port 10 is directly fixedly connected to the lower end of the piston rod of the corresponding cylinder 18 to realize its vertical position adjustment.

[0048] To ensure the smoothness and guiding accuracy of the vertical movement of each pressing roller, guide rollers 15 are arranged parallel to each other on both sides of the piston rod of the cylinder 18. The lower end of each guide roller 15 is fixedly connected to the second connecting frame 14 and the heating output port 10, respectively. The first connecting frame 5 is provided with a movable hole 24 that slides with the guide roller 15. When the cylinder 18 drives the second connecting frame 14 and the heating output port 10 to move up and down, the guide roller 15 slides synchronously in the movable hole 24, providing stable guiding support for the lifting and lowering of the pressing roller.

[0049] like Figure 3 , Figure 4 and Figure 5 As shown, an elastic pressure mechanism is provided between the first connecting frame 5 and the second connecting frame 14. The mechanism includes three springs 16. Two springs 16 are respectively sleeved on the outside of the two guide rollers 15 on the upper end of the second connecting frame 14. The upper end of the spring 16 abuts against the lower surface of the first connecting frame 5, and the lower end abuts against the upper surface of the second connecting frame 14.

[0050] The third spring 16 is sleeved between the piston rod of the cylinder 18 and the second connecting frame 14. With this arrangement, the three springs 16 work together on the second connecting frame 14 to keep it under downward elastic preload.

[0051] It is worth noting that when the springs 16 are installed, each spring 16 is pre-compressed by a certain amount, that is, it has a pre-compression amount. This pre-compression amount can first eliminate the assembly gap between the moving parts, and ensure that the pressure can be transmitted to the first pressing roller 6, the second pressing roller 8, and the third pressing roller 9 in time when the cylinder 18 is started, thus avoiding empty stroke.

[0052] Secondly, the spring 16 is always under pressure, so that when a depression appears on the mold surface, the spring 16 can quickly release its elastic force to push the first pressing roller 6, the second pressing roller 8, and the third pressing roller 9 downwards, ensuring that the pressing rollers are always in close contact with the mold surface.

[0053] More importantly, during the equipment design process, by reasonably selecting the stiffness coefficient, free length, and installation height of spring 16, and combining it with the maximum stroke range of the cylinder, it is ensured that spring 16 always maintains a certain compression margin during operation. Specifically, when the cylinder 18 drives the pressing roller to press down to the maximum working stroke, the compression of each spring 16 is controlled within a range less than its limit compression. This means that spring 16 will not be crushed under any working condition and always retains space for continued compression or rebound.

[0054] This design, which always retains a compression margin, has significant engineering implications. On the one hand, it ensures that when the spring 16 encounters a local protrusion on the mold surface, it can be further compressed to absorb displacement.

[0055] On the other hand, when the surface of the mold 7 is concave, the spring 16 still has sufficient elasticity reserve to push the first pressing roller 6, the second pressing roller 8 and the third pressing roller 9 downward to ensure that the first pressing roller 6, the second pressing roller 8 and the third pressing roller 9 always maintain a uniform contact pressure with the surface of the prepreg.

[0056] The adaptive floating and following function of the first pressing roller 6, the second pressing roller 8 and the third pressing roller 9 to the complex curved surface mold 7 was realized.

[0057] In this embodiment, the upper mounting plate 3 is movably mounted on the upper end of the housing 1 via a first movable structure.

[0058] Specifically, the first movable structure includes: a plurality of rollers 13 disposed at the lower end of the upper mounting plate 3, a first movable rail 12 disposed on the inner wall of the housing 1 and cooperating with the rollers 13, and a first threaded rod 11 threadedly connected to the upper mounting plate 3.

[0059] The first threaded rod 11 extends laterally through the upper mounting plate 3, and its two ends are rotatably supported on the outer casing 1, with one end of it being connected to a drive device.

[0060] When the first threaded rod 11 rotates, it drives the upper mounting plate 3 to move laterally along the first movable rail 12 through the threaded transmission, thereby synchronously driving the heating output port 10, the first pressing roller 6, the second pressing roller 8 and the third pressing roller 9 fixed on the upper mounting plate 3 to move as a whole, so as to realize the precise lateral feeding movement of the heating output port 10 and each pressing roller along the surface of the mold 7.

[0061] Working principle: When using the device to pressurize and lay the thermoplastic prepreg in multiple dimensions, the mold 7 is placed between two fixed strips 17. The second threaded rod 20 is twisted to push one of the fixed strips 17 laterally at the position of the second movable rail 19, thus clamping and fixing the mold 7. Each infusion tube 23 transmits the corresponding liquid into the first pressing roller 6, the second pressing roller 8, and the third pressing roller 9 respectively. Room temperature liquid is sent into the first pressing roller 6 and the third pressing roller 9, while hot oil is heated and sent into the second pressing roller 8. The cylinder 1 is driven according to the thickness of the mold 7. 8. This brings the first pressing roller 6, the second pressing roller 8, the third pressing roller 9, and the heating output port 10 close to the pressure laying position. At the moment the prepreg is transferred and discharged from the heating output port 10, it is heated by the heating structure at the upper end of the heating output port 10. The first threaded rod 11 rotates laterally, driving the upper mounting plate 3 to move along the first movable rail 12. The prepreg discharged from the heating output port 10 passes through the contact and pressing of the first pressing roller 6, the second pressing roller 8, and the third pressing roller 9 one by one, completing the multi-dimensional pressure laying of the prepreg in the mold 7.

[0062] Example 2, as Figure 7 As shown, the thermoplastic prepreg multi-dimensional pressure laying device of this embodiment has a general structure that is similar to that of embodiment 1. The main difference is that the installation method and movement form of the upper mounting plate 3 and the lower mounting plate 2 are different.

[0063] Specifically, in this embodiment, the upper mounting plate 3 is fixedly connected to the upper end inside the outer shell 1, that is, the heating output port 10, the first pressing roller 6, the second pressing roller 8 and the third pressing roller 9 remain in fixed positions during the laying process and do not move laterally. Correspondingly, the roller 13, the first threaded rod 11 and the first movable rail 12 in embodiment 1 are not provided around the upper mounting plate 3.

[0064] In contrast, the lower mounting plate 2 is movably mounted inside the lower end of the housing 1 via a second movable structure.

[0065] Specifically, the second movable structure includes: two third movable rails 21 disposed at the bottom of the housing 1, and a third threaded rod 22 that is threadedly engaged with the lower mounting plate 2. The lower mounting plate 2 is slidably embedded inside the third movable rails 21, and the third threaded rod 22 is disposed parallel between the two third movable rails 21, with its two ends rotatably supported on the housing 1.

[0066] When the third threaded rod 22 rotates, it drives the lower mounting plate 2 to move laterally along the third movable rail 21 through thread transmission, thereby driving the mold 7 fixed at its upper end to move synchronously.

[0067] During the laying operation, the prepreg discharged from the heating outlet 10, which has been heated and softened, is pressed in sequence by the first pressing roller 6, the second pressing roller 8 and the third pressing roller 9 fixed on the upper mounting plate 3.

[0068] At the same time, by driving the third threaded rod 22 to rotate, the lower mounting plate 2 drives the mold 7 to move laterally, thereby realizing the continuous laying of prepreg on the surface of the mold 7. This movement mode of fixing the laying head but moving the mold 7 complements the laying head moving but the mold 7 fixed in Embodiment 1, and together they embody the multi-dimensional pressure laying concept of the present invention.

[0069] The other structures, connections, and working principles of this embodiment are the same as those of Embodiment 1, and will not be repeated here.

[0070] Working principle: When using the device to pressurize and lay the thermoplastic prepreg in multiple dimensions, the upper mounting plate 3 is fixed to the upper end inside the outer shell 1. The mold 7 is placed between two fixing strips 17. The second threaded rod 20 is twisted to push one of the fixing strips 17 laterally at the position of the second movable rail 19, thus completing the clamping and fixing of the mold 7. Each infusion tube 23 transmits the corresponding liquid into the first pressing roller 6, the second pressing roller 8, and the third pressing roller 9 respectively. Room temperature liquid is sent into the first pressing roller 6 and the third pressing roller 9, while hot oil is heated and sent into the second pressing roller 8. The cylinder 18 is driven according to the thickness of the mold 7. The first pressing roller 6, the second pressing roller 8, the third pressing roller 9, and the heating output port 10 are brought close to the pressure laying position. At the moment the prepreg is transferred and discharged from the heating output port 10, it is heated by the heating structure at the upper end of the heating output port 10. The rotation of the third threaded rod 22 drives the lower mounting plate 2 to move laterally along the third movable rail 21. The lower mounting plate 2 drives the clamped mold 7 to move laterally. The prepreg discharged from the heating output port 10 passes through the contact and pressing of the first pressing roller 6, the second pressing roller 8, and the third pressing roller 9 one by one, completing the multi-dimensional pressure laying of the prepreg in the mold 7.

[0071] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0072] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention.

Claims

1. A multi-dimensional pressure laying device for thermoplastic prepreg, comprising a shell (1), characterized in that, The upper part of the interior of the outer shell (1) is provided with a laying structure, which includes an upper mounting plate (3) and a heating output port (10), a first pressing roller (6), a second pressing roller (8) and a third pressing roller (9) arranged sequentially on the upper mounting plate (3) along the laying forward direction. The heating output port (10) is used to heat and discharge the prepreg. The first pressing roller (6) and the third pressing roller (9) are configured to maintain a first temperature, and the second pressing roller (8) is configured to maintain a second temperature higher than the first temperature. The lower part of the interior of the outer shell (1) is provided with a lower mounting plate (2). A mold (7) is placed on the upper part of the lower mounting plate (2). The prepreg discharged through the heating output port (10) is pressed onto the mold (7) by the first pressing roller (6), the second pressing roller (8) and the third pressing roller (9) in sequence.

2. The thermoplastic prepreg multi-dimensional pressure laying device according to claim 1, characterized in that, The upper mounting plate (3) is movably mounted on the upper end inside the outer shell (1) via a first movable structure. The first movable structure includes a plurality of rollers (13) disposed on the upper mounting plate (3), a first movable rail (12) disposed on the inner wall of the outer shell (1) and cooperating with the rollers (13), and a first threaded rod (11) threadedly connected to the upper mounting plate (3) and used to drive it to move along the first movable rail (12).

3. The thermoplastic prepreg multi-dimensional pressure laying device according to claim 1, characterized in that, The lower mounting plate (2) is fixedly connected to the lower end inside the outer shell (1).

4. The thermoplastic prepreg multi-dimensional pressure laying device according to claim 1, characterized in that, The upper mounting plate (3) is fixedly connected to the upper end of the shell (1).

5. The thermoplastic prepreg multi-dimensional pressure laying device according to claim 1, characterized in that, The lower mounting plate (2) is movably mounted inside the lower end of the housing (1) via a second moving structure. The second moving structure includes two third movable rails (21) disposed at the bottom of the housing (1) and a third threaded rod (22) threadedly engaged with the lower mounting plate (2). The lower mounting plate (2) is slidably embedded inside the third movable rails (21), and the third threaded rod (22) is used to drive the lower mounting plate (2) to move along the third movable rails (21).

6. The thermoplastic prepreg multi-dimensional pressure laying device according to claim 1, characterized in that, A cylinder (18) is provided above the first pressing roller (6), the second pressing roller (8), the third pressing roller (9) and the heating output port (10). Each cylinder (18) is fixedly connected to the upper mounting plate (3) through the first connecting frame (5). Guide rollers (15) are arranged parallel on both sides of the piston rod of the cylinder (18). The first connecting frame (5) is provided with a movable hole (24) that slides with the guide roller (15).

7. The thermoplastic prepreg multi-dimensional pressure laying device according to claim 6, characterized in that, A second connecting frame (14) is provided below the first pressing roller (6), the second pressing roller (8), and the third pressing roller (9). The first pressing roller (6), the second pressing roller (8), and the third pressing roller (9) are rotatably mounted on each of the second connecting frames (14). The upper ends of the second connecting frames (14) and the heating output port (10) are fixedly connected to each of the guide rollers (15).

8. The thermoplastic prepreg multi-dimensional pressure laying device according to claim 7, characterized in that, An elastic pressure mechanism is provided between the second connecting frame (14) and the first connecting frame (5). The elastic pressure mechanism includes three springs (16), two of which are respectively sleeved on the outside of the two guide rollers (15) and abut against the first connecting frame (5) and the second connecting frame (14). The third spring (16) is sleeved on one end of the piston rod of the cylinder (18) and abuts against the cylinder body of the cylinder (18) and the second connecting frame (14).

9. The thermoplastic prepreg multi-dimensional pressure laying device according to claim 8, characterized in that, Each of the springs (16) has a pre-compression amount in the installed state, and when the cylinder (18) drives the pressing roller to press down to the maximum working stroke, the compression amount of each spring (16) is less than its limit compression amount, so that each spring (16) always retains a compression margin.

10. The thermoplastic prepreg multi-dimensional pressure laying device according to claim 1, characterized in that, The first temperature is lower than the melting temperature of the thermoplastic prepreg, and the first temperature is 20-60℃. The second temperature is higher than the first temperature but lower than the thermal decomposition temperature of the thermoplastic prepreg, and the second temperature is 150-200℃.

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