A continuous pultrusion device for integrated polyether ether ketone carbon fiber prepreg tape

Abstract

The present application relates to the technical field of material forming, in particular to a continuous pultrusion forming device for integrated polyether ether ketone carbon fiber prepreg tape, comprising: a pre-winding deformation assembly, a hot winding forming assembly and a melting extrusion assembly fixedly connected in sequence along the pultrusion direction; the pre-winding deformation assembly is internally provided with two first cavities symmetrical to the axis of the pre-winding deformation assembly and gradually shrinking; the hot winding forming assembly is internally provided with a second cavity in communication with the two first cavities; and the melting extrusion assembly is used for heating the solid round pipe after pultrusion through the second cavity. The pre-winding deformation assembly utilizes the viscoelastic characteristics of the material in the high elastic state to preliminarily deform and improve the bending stiffness in the subsequent process; the hot winding forming assembly gradually shrinks the cavity to integrate multiple polyether ether ketone carbon fiber prepreg tapes, and the melting extrusion assembly sets a heat source to utilize the fluidity and plasticity of the base material when it is transformed into a viscous flow state to form a solid round rod.

Description

Technical Field

[0001] This invention relates to the field of material forming technology, and in particular to an integrated continuous pultrusion molding apparatus for polyetheretherketone carbon fiber prepreg tape. Background Technology

[0002] With the development of aerospace technology and the deepening of human space exploration, the demand for large-scale space structures is growing rapidly. As a key structure supporting large facilities, space trusses are being built on scales of hundreds of meters and even kilometers. However, the traditional method of ground manufacturing and rocket-borne transport is limited by fairing size and launch costs, making it difficult to meet the needs of efficient and economical construction of future giant and ultra-long truss structures.

[0003] Existing on-orbit trusses mostly employ a ground-prefabricated, on-orbit deployment model, which severely restricts their structural size and complexity, and suffers from high launch costs and low space utilization. To overcome this bottleneck, developing space-based on-orbit manufacturing technology to achieve "on-site construction" of large structures has become an inevitable trend. Against this backdrop, lightweight, high-performance resin-based composite materials, especially carbon fiber reinforced polyetheretherketone (CF / PEEK) thermoplastic composites, are considered ideal materials for constructing future large-scale space trusses due to their advantages such as high specific strength, high specific modulus, excellent space environment tolerance, and the ability to be integrally molded through design.

[0004] Currently, when preparing scaffold structures such as pipes using etheretherketone carbon fiber prepreg tape, the common practice is to force the etheretherketone carbon fiber prepreg tape through a forming mold under high temperature conditions, thereby stacking them together and ultimately forming the desired structure.

[0005] However, when preparing solid round rods using this method, the etheretherketone carbon fiber prepreg tape undergoes a rapid phase transition from its glass transition temperature to its melting point at the mold inlet under high temperature, which affects the bending stiffness of the structure after molding. At the same time, during the shrinkage and integration process of the etheretherketone carbon fiber prepreg tape in the mold, uneven fusion is also prone to occur, affecting the overall filling density, and even causing local accumulation or blockage of the mold, which greatly affects the performance of the solid tube. Summary of the Invention

[0006] Based on the above-mentioned technical problems, the purpose of this invention is to provide an integrated continuous pultrusion molding apparatus for preparing solid round rods using polyether ether ketone carbon fiber prepreg tape, so as to solve the technical problems of poor compactness and mold blockage of solid round rods when using polyether ether ketone carbon fiber prepreg tape to prepare solid round rods in the prior art, thereby improving the performance of the prepared solid round rods.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] An integrated continuous pultrusion molding apparatus for polyetheretherketone (PEEK) carbon fiber prepreg tape includes: a pre-winding deformation assembly, a hot-rolling forming assembly, and a melt extrusion assembly sequentially connected and fixed along the pultrusion direction; the pre-winding deformation assembly has two first cavities inside, which are symmetrically arranged with respect to the axis of the pre-winding deformation assembly and gradually shrink along the pultrusion direction with respect to the axis of the pre-winding deformation assembly; the hot-rolling forming assembly has a second cavity inside that communicates with the two first cavities, and the diameter of the cross-section of the second cavity gradually decreases along the pultrusion direction; the melt extrusion assembly is used to heat the solid circular tube after pultrusion through the second cavity at a high temperature;

[0009] Furthermore, the pre-rolling deformation assembly includes: a lower concave outer mold, an inner convex mold, and an upper concave outer mold; the lower concave outer mold, the inner convex mold, and the upper concave outer mold are sequentially connected and fixed by bolts; the lower concave outer mold and one side of the inner convex mold cooperate to form a first cavity, and the other side of the inner convex mold cooperates with the upper concave outer mold to form a second first cavity;

[0010] Furthermore, the hot roll forming assembly includes: a hot roll upper die and a hot roll lower die; the hot roll upper die and the hot roll lower die are positioned by upper and lower pin holes, and are fastened and fixed by bolt connection to form a second cavity;

[0011] Furthermore, the melt extrusion assembly includes: an inner heat insulation plate, a conduit, a heat-conducting module, an electric heating element, and a hot melt extrusion head; one end of the inner heat insulation plate is fixedly disposed on the outlet end face of the hot roll forming assembly, and the other end of the inner heat insulation plate is fixedly connected to the heat-conducting module, on which multiple electric heating elements are evenly arranged; the conduit is fixedly disposed within the inner heat insulation plate and communicates with the second cavity of the hot roll forming assembly; the hot melt extrusion head is fixedly disposed within the heat-conducting module and communicates with the conduit;

[0012] Furthermore, the cross-sectional shape of the second cavity is an arc;

[0013] Furthermore, an external heat insulation plate is fixedly installed on the side of the pre-rolling deformation assembly, the hot-rolling forming assembly, and the melt extrusion assembly;

[0014] Furthermore, the pre-rolling deformation assembly, the hot-rolling forming assembly, and the melt extrusion assembly are fixed on the base plate.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This invention is designed based on the glass transition temperature and melting point of polyetheretherketone (PEEK) material. In the first cavity of the pre-rolling deformation assembly, the viscoelastic characteristics of the material in a highly elastic state are used for initial deformation to improve the bending stiffness of the structure during subsequent pultrusion molding. In the second cavity of the hot-rolling molding assembly, multiple PEEK carbon fiber prepreg tapes are integrated by gradually shrinking cavities. A heat source is set in the melt extrusion assembly, and the matrix material is transformed into a viscous flow state by high-temperature heating to ultimately form a solid round rod.

[0017] 2. This invention multi-stages the complex pultrusion cavity, precisely controlling the cross-sectional shape through different modules, resulting in a smooth and gentle mold cavity that is easy to process and assemble. Attached Figure Description

[0018] Figure 1 This is an isometric view of a continuous pultrusion molding apparatus for an integrated polyetheretherketone carbon fiber prepreg tape according to the present invention.

[0019] Figure 2 This is an axonometric sectional view of an integrated continuous pultrusion molding apparatus for polyetheretherketone carbon fiber prepreg tape according to the present invention.

[0020] Figure 3 This is a schematic diagram showing the changes in the cavity and bottom line of the pre-rolled deformation component in this invention;

[0021] Figure 4 This is a schematic diagram of the cross-section of the cavity of the pre-rolled deformation component in this invention;

[0022] Figure 5 This is a schematic diagram of the cavity of the hot-roll forming component in this invention;

[0023] In the diagram: 1. Base plate; 2. Pre-rolling deformation assembly; 21. Lower concave outer mold; 22. Inner punch; 23. Upper concave outer mold; 24. First cavity; 3. Hot roll forming assembly; 31. Hot roll upper mold; 32. Hot roll lower mold; 33. Second cavity; 4. Outer heat insulation plate; 5. Melt extrusion assembly; 51. Inner heat insulation plate; 52. Conduit; 53. Heat-conducting module; 54. Electric heating tube; 55. Hot melt extrusion head. Detailed Implementation

[0024] The technical solutions adopted in this invention will be clearly and completely explained and described below with reference to the accompanying drawings and specific embodiments;

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1As shown, the present invention provides an integrated continuous pultrusion molding apparatus for polyetheretherketone carbon fiber prepreg tape, comprising: a pre-winding deformation assembly 2, a hot-rolling molding assembly 3, and a melt extrusion assembly 5 connected sequentially along the pultrusion molding direction of the polyetheretherketone carbon fiber prepreg tape;

[0027] In this embodiment, the pre-rolling deformation assembly 2, the hot-rolling forming assembly 3, and the melt extrusion assembly 5, which are connected in sequence, can be fixedly mounted on the base plate 1, that is, the base plate 1 is used as a foundation to ensure the stability of the entire forming device, wherein:

[0028] The pre-winding deformation component 2 is used to pre-wind multiple polyether ether ketone carbon fiber prepreg tapes stacked together. That is, in the pultrusion process, the pre-winding deformation component 2 is first used to perform preliminary rotation and winding of the polyether ether ketone carbon fiber prepreg tapes from the edge.

[0029] Along the axial direction of the pre-rolling deformation assembly 2, a first cavity 24 is provided inside the pre-rolling deformation assembly 2, penetrating the entire pre-rolling deformation assembly 2. The first cavity 24 has an arc-shaped cross-section and there are two of them.

[0030] Furthermore, such as Figure 2-4 As shown, the pre-rolling deformation assembly 2 includes: a lower concave outer mold 21, an inner convex mold 22, and an upper concave outer mold 23; in this embodiment, the lower concave outer mold 21, the inner convex mold 22, and the upper concave outer mold 23 can be connected and fixed sequentially by bolts. The lower concave outer mold 21 and the inner convex mold 22 can be fixed on the base plate 1 at the same time, and the upper concave outer mold 23 and the inner convex mold 22 can be connected to the hot roll forming assembly 3 by bolts.

[0031] A first cavity 24 is formed by the lower concave outer mold 21 and one side of the inner convex mold 22, and a second first cavity 24 is formed by the other side of the inner convex mold 22 and the upper concave outer mold 23.

[0032] like Figure 3 As shown, the two first cavities 24 are arranged symmetrically with respect to the center of the pre-rolling deformation assembly 2, and the two first cavities 24 gradually shrink relative to the axis along the pultrusion direction;

[0033] During the pultrusion process, multiple stacked polyetheretherketone carbon fiber prepreg tapes need to be divided into two groups. Each group of polyetheretherketone carbon fiber prepreg tapes is initially deformed under the constraint of two first cavities 24, utilizing the viscoelastic characteristics of the material itself in a highly elastic state. During deformation, as the two first cavities 24 gradually shrink relative to the axis along the pultrusion direction, the bottom line of each group of polyetheretherketone carbon fiber prepreg tapes gradually approaches each other following the uphill method, and its edge follows the comprehensive bending forming method to bend and transition, thereby changing the edge of each group of polyetheretherketone carbon fiber prepreg tapes from horizontal to U-shaped.

[0034] The upper concave outer mold 23 and the inner convex mold 22 can be connected to the hot roll forming assembly 3 by bolts.

[0035] The hot-roll forming component 3 is used to gradually reduce the forming diameter of the polyether ether ketone carbon fiber prepreg tape after pre-rolling treatment by the pre-rolling deformation component 2, so that each group of polyether ether ketone carbon fiber prepreg tapes after passing through the two first cavities 24 is gradually compacted into a solid round rod.

[0036] like Figure 2 As shown, along the axial direction of the hot roll forming assembly 3, a second cavity 33 is provided inside the hot roll forming assembly 3, penetrating the entire hot roll forming assembly 3;

[0037] Located at the inlet end of the hot-roll forming assembly 3, that is, the end face of the second cavity 33 near the pre-rolling deformation assembly 2 is connected to the two first cavities 24, and its diameter is connected and transitioned with the outlet of the two first cavities 24 of the pre-rolling deformation assembly 2, so as to ensure that the polyether ether ketone carbon fiber prepreg tape extruded through the two first cavities 24 can smoothly enter the second cavity 33.

[0038] Meanwhile, the cross-sectional diameter of the entire second cavity 33 gradually decreases along the pultrusion direction, that is, from the pre-rolled deformation component 2 to the melt extrusion component 5, and the cross-sectional shape of the second cavity 33 is an arc.

[0039] Furthermore, in this embodiment, as Figure 5 As shown, the hot roll forming assembly 3 includes: a hot roll upper mold 31 and a hot roll lower mold 32;

[0040] Specifically, the lower hot roll die 32 is located below, and the bottom surface of the lower hot roll die 32 can be fixedly connected to the base plate 1. The upper hot roll die 31 and the lower hot roll die 32 are positioned by the upper and lower pin holes and are fastened and fixed by bolt connection, thereby forming the second cavity 33.

[0041] During the pultrusion process, the second cavity 33 is used to gradually wind and integrate multiple polyether ether ketone carbon fiber prepreg tapes into a solid round rod.

[0042] Both ends of the hot-rolling upper die 31 and hot-rolling lower die 32, which are fastened together, can be connected and fixed to the upper concave outer die 23 and inner convex die 22 of the pre-rolling deformation component 2 and the melt extrusion component 5 by bolts along the axial direction.

[0043] The melt extrusion assembly 5 is used to heat the solid round rod that has been wound and integrated by the hot rolling forming assembly 3 at high temperature to form a final stable solid round rod;

[0044] In this embodiment, the melt extrusion assembly 5 includes: an inner heat insulation plate 51, a conduit 52, a heat conduction module 53, an electric heating tube 54, and a hot melt extrusion head 55;

[0045] Specifically, one end of the inner heat insulation plate 51 is fixedly mounted on the outlet end face of the hot roll forming assembly 3.

[0046] The other end of the inner heat insulation plate 51 is fixedly connected to the heat conduction module 53, and multiple electric heating tubes 54 are evenly arranged on the heat conduction module 53.

[0047] The conduit 52 is fixedly installed inside the inner heat insulation plate 51 and is connected to the second cavity 33 of the hot-rolled forming assembly 3.

[0048] The hot melt extrusion head 55 is fixedly installed inside the heat-conducting module 53 and is connected to the conduit 52;

[0049] The melt extrusion assembly 5 uses an electric heating tube 54 to heat the heat-conducting module 53 and the hot melt extrusion head 55 located in the heat-conducting module 53 to a certain temperature, such as 400 degrees Celsius. In this way, the solid round rod that is wound and integrated by the second cavity 33 enters the hot melt extrusion head 55 through the guide tube 52 during the pulling process and is heated. Then it is pulled out from the hot melt extrusion head 55 to form a final stable solid round rod.

[0050] The inner heat insulation plate 51 serves to isolate the temperature transfer between the melt extrusion assembly 5 and the hot roll forming assembly 3;

[0051] Furthermore, such as Figure 1-2 As shown, external heat insulation plates 4 can also be fixed on both sides of the entire device. The external heat insulation plates 4 are connected to the inner punch 22 and the heat conduction module 53 by connecting screws to ensure the molding temperature.

[0052] The above description is merely an embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, extensions, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. An integrated continuous pultrusion molding apparatus for polyetheretherketone (PEEK) carbon fiber prepreg tape, comprising: The pre-rolling deformation assembly (2), the hot-rolling forming assembly (3), and the melt extrusion assembly (5) are connected and fixed in sequence along the pultrusion direction. The pre-rolling deformation assembly (2) is characterized in that it has two first cavities (24) inside, the two first cavities (24) are symmetrically arranged with respect to the axis of the pre-rolling deformation assembly (2), and gradually shrink with respect to the axis of the pre-rolling deformation assembly (2) along the pultrusion direction; The hot roll forming assembly (3) has a second cavity (33) inside that is connected to the two first cavities (24), and the diameter of the cross-section of the second cavity (33) gradually decreases along the pultrusion direction; The melt extrusion assembly (5) is used to heat the solid round tube after it has been pultruded by the second cavity (33) at high temperature.

2. The integrated continuous pultrusion molding apparatus for polyetheretherketone (PEEK) carbon fiber prepreg tape according to claim 1, characterized in that, The pre-rolling deformation assembly (2) includes: a lower concave outer mold (21), an inner convex mold (22), and an upper concave outer mold (23); the lower concave outer mold (21), the inner convex mold (22), and the upper concave outer mold (23) are connected and fixed in sequence by bolts; The concave outer mold (21) and one side of the inner punch (22) cooperate to form a first cavity (24), and the other side of the inner punch (22) cooperates with the upper concave outer mold (23) to form a second first cavity (24).

3. The integrated continuous pultrusion molding apparatus for polyetheretherketone (PEEK) carbon fiber prepreg tape according to claim 1, characterized in that, The hot roll forming assembly (3) includes: a hot roll upper die (31) and a hot roll lower die (32); The upper hot roll die (31) and the lower hot roll die (32) are positioned by upper and lower pin holes and are fastened and fixed by bolt connection to form a second cavity (33).

4. The integrated continuous pultrusion molding apparatus for polyetheretherketone (PEEK) carbon fiber prepreg tape according to claim 1, characterized in that, The melt extrusion assembly (5) includes: an inner heat insulation plate (51), a conduit (52), a heat-conducting module (53), an electric heating tube (54), and a hot melt extrusion head (55); One end of the inner heat insulation plate (51) is fixedly disposed on the outlet end face of the hot roll forming assembly (3), and the other end of the inner heat insulation plate (51) is fixedly connected to the heat conduction module (53). Multiple electric heating tubes (54) are evenly arranged on the heat conduction module (53). The conduit (52) is fixedly installed inside the inner heat insulation plate (51) and is connected to the second cavity (33) of the hot-rolled forming assembly (3); The hot melt extrusion head (55) is fixedly installed inside the heat-conducting module (53) and connected to the conduit (52).

5. The integrated continuous pultrusion molding apparatus for polyetheretherketone (PEEK) carbon fiber prepreg tape according to claim 1, characterized in that, The cross-sectional shape of the second cavity (33) is an arc.

6. The integrated continuous pultrusion molding apparatus for polyetheretherketone (PEEK) carbon fiber prepreg tape according to claim 1, characterized in that, External heat insulation plates (4) are fixedly installed on the sides of the pre-rolling deformation assembly (2), hot-rolling forming assembly (3) and melt extrusion assembly (5).

7. The integrated continuous pultrusion molding apparatus for polyetheretherketone (PEEK) carbon fiber prepreg tape according to claim 1, characterized in that, The pre-rolling deformation assembly (2), the hot-rolling forming assembly (3), and the melt extrusion assembly (5) are fixed on the base plate (1).

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