A polyvinyl composite pipe manufacturing apparatus and method

Abstract

The application relates to the technical field of fiber-reinforced composite pipe materials, in particular to a polyethylene-based composite pipe material preparation device and method. The device comprises a servo unwinding machine, a polyethylene solution tank, a shaping unit and a traction machine. The servo unwinding machine is used for conveying a strip-shaped continuous fiber braid cover to the polyethylene solution tank. Space guide rollers are arranged in the polyethylene solution tank. After the continuous fiber braid cover is impregnated with polyethylene solution in the polyethylene solution tank, the continuous fiber braid cover is guided and output through the space guide rollers. The shaping unit is arranged at the discharging end of the polyethylene solution tank. The impregnated continuous fiber braid cover is sent into the shaping unit to be shaped into a pipe material. The traction machine is arranged at the discharging side of the shaping unit and is used for externally drawing and outputting the shaped pipe material. The application adopts continuous aramid fibers as the reinforcing phase, eliminates the fiber lap strength defects caused by non-continuous fibers, fully plays the high axial tensile performance of the para-aramid fibers, and significantly improves the axial tensile strength of the pipe material.

Description

Technical Field

[0001] This invention relates to the field of fiber-reinforced composite pipe technology, and in particular to an apparatus and method for preparing polyethylene-based composite pipes. Background Technology

[0002] The long lengths of marine cables necessitate the online preparation and simultaneous laying of conduits on the work vessel, requiring the use of continuous fiber-reinforced polyethylene (PVC) pipes. Existing continuous fiber-reinforced PVC pipes include ultra-high molecular weight polyethylene (UHMWPE) fiber-reinforced spiral pipes, aramid fiber-reinforced PVC composite spiral pipes, and high-performance PVC fiber-reinforced spiral pipes. Existing aramid fiber-reinforced PVC composite spiral pipes use discontinuous aramid fibers, resulting in strength defects at fiber overlaps. Reinforced PVC pipes prepared using fiber winding processes generally suffer from insufficient axial strength and insufficient anti-permeability lifespan between fibers. While the peak axial tensile strength of para-aramid fibers is approximately 2744 MPa, the axial tensile strength of aramid fiber-reinforced PVC composite spiral pipes is limited to only 160 MPa-355 MPa due to limitations in existing discontinuous fiber preparation processes. Therefore, new technical solutions are urgently needed to address these technical problems. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide a device and method for preparing polyethylene-based composite pipes, which solves the problems of existing aramid fiber reinforced polyethylene composite spiral pipes, which suffer from defects in fiber overlap strength, low axial strength of the pipe, and insufficient anti-permeability life of fiber gaps due to the use of discontinuous aramid fibers, thus failing to fully utilize the high strength performance of aramid fibers themselves.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] This invention provides a polyethylene-based composite pipe manufacturing apparatus, comprising a servo unwinding machine, a polyethylene solution tank, a shaping unit, and a traction machine. The servo unwinding machine is used to convey a strip of continuous fiber braided sheath into the polyethylene solution tank. A spatial guide roller is installed inside the polyethylene solution tank. After the continuous fiber braided sheath is immersed in the polyethylene solution in the tank, it is guided outward via the spatial guide roller. The shaping unit is located at the discharge end of the polyethylene solution tank, and the immersed continuous fiber braided sheath is fed into the shaping unit to be formed into a pipe. The traction machine is arranged on the discharge side of the shaping unit and is used to pull the formed pipe outward.

[0006] The shaping unit includes a head plug, a fixed inner diameter core, and a fixed outer diameter sleeve. The fixed outer diameter sleeve is disposed at the outlet of the polyethylene solution tank. The fixed inner diameter core is inserted into the fixed outer diameter sleeve. The head plug is assembled at the ends of the fixed inner diameter core and the fixed outer diameter sleeve. The fixed outer diameter sleeve and the fixed inner diameter core enclose each other to form an annular molding cavity.

[0007] The inner wall of the fixed outer diameter sleeve is provided with a curing device and an external magnetic action part. The curing device is used to cure the impregnated continuous fiber braided sleeve into a solid state.

[0008] The fixed inner diameter core is provided with an inner magnetic action part, which cooperates with the outer magnetic action part to form a closed magnetic circuit between the fixed inner diameter core and the fixed outer diameter sleeve; the closed magnetic circuit generates a magnetic constraint force to maintain the axial relative position of the fixed inner diameter core and the fixed outer diameter sleeve.

[0009] The external magnetic working part includes an external N pole and an external S pole; the internal magnetic working part includes an internal S pole and an internal N pole, wherein the internal S pole and the external N pole are positioned opposite each other;

[0010] The outer N pole, continuous fiber braided sleeve, inner S pole, fixed inner diameter core, inner N pole, continuous fiber braided sleeve, outer S pole, and fixed outer diameter sleeve together constitute the closed magnetic circuit.

[0011] The feed end of the fixed outer diameter sleeve is provided with an inlet chamfer; the feed end of the fixed inner diameter core is provided with a streamline head; the inlet chamfer and the streamline head cooperate to form the flared inlet of the annular forming cavity.

[0012] The starter plug includes a connecting body, a fixed inner diameter core connecting part disposed at the center of the connecting body, and a fixed outer diameter sleeve connecting part disposed on the outside of the connecting body; the fixed inner diameter core connecting part is positioned and connected to the central positioning hole on the end face of the fixed inner diameter core; the fixed outer diameter sleeve connecting part is an annular structure concentrically disposed with the fixed inner diameter core connecting part, and the fixed outer diameter sleeve connecting part is positioned and connected to the end of the fixed outer diameter sleeve.

[0013] The traction machine includes a traction machine body and an inner core, a first arc-shaped clamp, and a second arc-shaped clamp disposed on the traction machine body. The inner core is located between the first and second arc-shaped clamps and is arranged inside the pipe to form a supporting contact. The first and second arc-shaped clamps are arranged outside the pipe. The inner core, the first arc-shaped clamp, and the second arc-shaped clamp together clamp the head of the pipe through surface contact. The traction machine body is used to realize mobile traction.

[0014] The continuous fiber braided sleeve is composed of multiple layers of continuous axial fibers and non-axial fibers. The non-axial fibers repeatedly wrap around the multiple layers of axial fibers in a cyclical and iterative spatial weaving process, forming an interwoven braided sleeve body.

[0015] The polyethylene composite pipe manufacturing apparatus further includes a continuous fiber braided sleeve manufacturing unit;

[0016] The continuous fiber braided sleeve preparation unit includes a mobile nozzle machine, a braiding machine, and multiple axial nozzles. The braiding machine is suspended above the workshop, and the multiple axial nozzles are fixedly arranged at the process stations on the workshop floor. A heating and feeding system is configured below the workshop floor. The axial nozzles are used to output axial aramid yarns. The mobile nozzle machine is capable of planar movement and is equipped with an aramid granule hopper. The mobile nozzle machine is used to output non-axial aramid yarns. The mobile nozzle machine completes the winding operation between the multiple axial nozzles.

[0017] Another aspect of the present invention provides a method for preparing polyethylene-based composite pipes using the apparatus described above, comprising the following steps:

[0018] S1. Prepare a continuous fiber braided sleeve;

[0019] S2. The continuous fiber braided sleeve is conveyed to the polyethylene solution tank so that the continuous fiber braided sleeve is immersed in the polyethylene solution;

[0020] S3. The continuous fiber braided sleeve impregnated with polyethylene solution is fed into the annular forming cavity defined by the initiator plug, the inner diameter core and the outer diameter sleeve.

[0021] S4. The impregnated continuous fiber braided sleeve in the annular forming cavity is cured to obtain a polyethylene composite pipe.

[0022] S5. Use a traction machine to clamp the head of the pipe and pull the pipe out.

[0023] The continuous fiber braided sleeve includes multiple layers of axial fibers and non-axial fibers. The multiple layers of axial fibers are arranged between the inner and outer boundaries of the braided sleeve. Each layer of axial fibers is a continuous fiber. The non-axial fibers start from the starting point, pass around the intersection point of the axial fibers in sequence, and repeatedly surround the multiple layers of axial fibers in a path from the inside out and then from the outside in, to complete the spatial weaving in a cyclical iteration.

[0024] The present invention has the following beneficial effects and advantages:

[0025] This invention uses continuous aramid fiber as the reinforcing phase, eliminating the fiber overlap strength defects caused by discontinuous fibers, giving full play to the high axial tensile strength of para-aramid fiber, and significantly improving the axial tensile strength of the pipe; at the same time, it improves the fiber arrangement gap problem, improves the anti-seepage durability of the pipe, and can meet the actual use conditions of online preparation and synchronous laying of long-distance cables on marine operation vessels.

[0026] This invention enables the complete production process of aramid fiber preparation, continuous aramid fiber weaving, and continuous aramid fiber reinforced polyethylene pipe. Compared with the axial tensile strength of 160MPa-355MPa of existing aramid fiber reinforced polyethylene composite spiral pipe, the axial tensile strength of the pipe prepared by this invention is increased to 360MPa-380MPa, effectively improving the axial load-bearing capacity of the pipe.

[0027] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0028] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0029] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0030] Figure 1 This is one of the isometric views of a polyethylene composite pipe preparation device according to the present invention;

[0031] Figure 2 This is the second isometric view of a polyethylene composite pipe preparation device according to the present invention;

[0032] Figure 3 for Figure 2 Enlarged view of a portion of point A in the middle;

[0033] Figure 4 This is a cross-sectional view of a polyethylene composite pipe manufacturing apparatus according to the present invention;

[0034] Figure 5 for Figure 4 Enlarged view of a section at point B in the middle;

[0035] Figure 6 This is a schematic diagram of the winding of the continuous fiber braided sleeve in an embodiment of the present invention;

[0036] Figure 7 This is a schematic diagram illustrating an embodiment of the present invention.

[0037] In the diagram: 1. Continuous fiber braided sleeve; 101. Continuous fiber braided sleeve vortex winding section; 102. Continuous fiber braided sleeve straightening section; 103. Continuous fiber braided sleeve spatial gradient section; 104. Continuous fiber braided sleeve cylindrical section; 105. Inner boundary; 106. Outer boundary; 107. First layer of axial fibers; 108. Second layer of axial fibers; 109. Third layer of axial fibers; 110. Non-axial fibers; 111. Non-axial fiber starting point; 112. First axial intersection point; 113. Second axial intersection point; 2. Servo unwinding machine; 3. Polyethylene solution tank; 4. Fixed outer diameter sleeve; 401. Center hole; 402. Outer N pole; 403. Outer S pole 404. Introducing chamfer; 405. Curing unit; 5. Fixed inner diameter core; 501. Streamline head; 502. Cylinder; 503. Inner S pole; 504. Inner N pole; 6. Opening plug; 601. Fixed inner diameter core connection part; 602. Fixed outer diameter sleeve connection part; 603. Connecting body; 7. Traction machine; 701. Inner core; 702. First arc surface clamp; 703. Second arc surface clamp; 704. Traction machine body; 8. Closed magnetic lines of force; 9. Spatial guide roller; 10. Moving nozzle machine; 11. Axial nozzle; 12. Braiding machine; 13. Non-axial aramid thread outlet; 14. Axial aramid thread outlet; 15. Workshop floor; 16. Aramid granule silo. Detailed Implementation

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0040] See Figures 1 to 7As shown, an embodiment of the present invention provides a polyethylene-based composite material pipe manufacturing apparatus, including a servo unwinding machine 2, a polyethylene solution tank 3, a shaping unit, and a traction machine 7. The servo unwinding machine 2 is used to convey a strip-shaped continuous fiber braided sleeve 1 to the polyethylene solution tank 3. A spatial guide roller 9 is provided inside the polyethylene solution tank 3. After the continuous fiber braided sleeve 1 is immersed in the polyethylene solution in the polyethylene solution tank 3, it is guided out by the spatial guide roller 9. The shaping unit is located at the discharge end of the polyethylene solution tank 3. The immersed continuous fiber braided sleeve 1 is fed into the shaping unit to be formed into a continuous fiber reinforced polyurethane pipe. The traction machine 7 is arranged on the discharge side of the shaping unit and is used to pull the formed pipe outward.

[0041] See Figures 1 to 5 As shown, in an embodiment of the present invention, the shaping unit includes a head plug 6, a core 5 for fixing the inner diameter, and a sleeve 4 for fixing the outer diameter. The sleeve 4 is disposed at the outlet of the polyethylene solution tank 3. The core 5 for fixing the inner diameter is inserted inside the sleeve 4 for fixing the outer diameter. The head plug 6 is assembled at the ends of the core 5 for fixing the inner diameter and the sleeve 4 for fixing the outer diameter. The sleeve 4 for fixing the outer diameter and the core 5 for fixing the inner diameter form an annular forming cavity. The diameter of the central hole 401 of the sleeve 4 for fixing the outer diameter is adapted to the outer diameter of the continuous fiber reinforced polyurethane tube. The inner wall of the sleeve 4 for fixing the outer diameter is provided with a curing device 405 and an external magnetic action part. The curing device 405 is used to cure the impregnated continuous fiber braided sleeve 1 into a solid state. The core 5 for fixing the inner diameter is provided with an internal magnetic action part. The internal magnetic action part cooperates with the external magnetic action part to form a closed magnetic circuit between the core 5 for fixing the inner diameter and the sleeve 4 for fixing the outer diameter. The closed magnetic circuit generates a magnetic constraint force to maintain the axial relative position of the core 5 for fixing the inner diameter and the sleeve 4 for fixing the outer diameter.

[0042] See Figure 5 As shown, in the embodiment of the present invention, the external magnetic action part includes an external N pole 402 and an external S pole 403; the internal magnetic action part includes an internal S pole 503 and an internal N pole 504, with the internal S pole 503 and the external N pole 402 positioned opposite each other, and the internal N pole 504 and the external S pole 403 positioned opposite each other; the path of the closed magnetic field line 8 is as follows: starting from the external N pole 402, passing through the continuous fiber polyurethane region to reach the internal S pole 503, passing through the interior of the fixed inner diameter core 5, being conducted from the internal S pole 503 to the internal N pole 504, then passing through the continuous fiber polyurethane region to reach the external S pole 403, and finally returning from the external S pole 403 to the external N pole 402 via the fixed outer diameter sleeve 4, forming a complete closed magnetic circuit. The fixed inner diameter core 5 has multiple sets of closed magnetic field lines 8 arranged circumferentially, relying on these circumferentially distributed closed magnetic field lines 8 to maintain the axial relative position between the fixed inner diameter core 5 and the fixed outer diameter sleeve 4.

[0043] The working temperature of the polyethylene solution tank 3 is set to 180℃-220℃, and the process temperature can be finely adjusted according to the melt index of the material. The curing unit 405 is preferably a water-cooled curing unit, whose water cooling system can achieve gradient cooling with a cooling rate ≤4.7℃ / min; the curing unit 405 can also be an auxiliary photo-crosslinking curing unit. After treatment by the curing unit 405, the continuous fiber polyurethane region becomes solid; the solidified continuous fiber polyurethane region is used to maintain the radial position of the fixed inner diameter core 5 relative to the fixed outer diameter sleeve 4.

[0044] Furthermore, the feed end of the fixed outer diameter sleeve 4 is provided with an inlet chamfer 404; the feed end of the fixed inner diameter core 5 is provided with a streamline head 501; the inlet chamfer 404 and the streamline head 501 cooperate to form the flared inlet of the annular forming cavity.

[0045] See Figure 4 As shown, the continuous fiber braided sleeve 1 is sequentially divided into a continuous fiber braided sleeve vortex winding section 101, a continuous fiber braided sleeve straightening section 102, a continuous fiber braided sleeve spatial transition section 103, and a continuous fiber braided sleeve cylindrical section 104; the continuous fiber braided sleeve vortex winding section 101 is flattened and stored on the servo unwinding machine 2; the continuous fiber braided sleeve straightening section 102 is tangentially drawn out from the continuous fiber braided sleeve vortex winding section 101 and extends to the spatial guide roller 9; the section from the spatial guide roller 9 to the entrance section of the fixed outer diameter sleeve 4 and the fixed inner diameter core 5 is the continuous fiber braided sleeve spatial transition section 103, in which the shape of the continuous fiber braided sleeve 1 transitions from a flattened state to a cylindrical state; the continuous fiber braided sleeve cylindrical section 104 is located between the fixed outer diameter sleeve 4 and the fixed inner diameter core 5.

[0046] In embodiments of the present invention, the initiator plug 6 includes a connecting body 603, a fixed inner diameter core connecting portion 601 disposed at the center of the connecting body 603, and a fixed outer diameter sleeve connecting portion 602 disposed on the outside of the connecting body 603; the fixed inner diameter core connecting portion 601 is positioned and connected to the central positioning hole on the end face of the fixed inner diameter core 5; the fixed outer diameter sleeve connecting portion 602 is an annular structure concentrically disposed with the fixed inner diameter core connecting portion 601, and the fixed outer diameter sleeve connecting portion 602 is positioned and connected to the end of the fixed outer diameter sleeve 4. The initiator plug 6 is only assembled and used in the initial stage of pipe forming; after the continuous fiber braided sleeve is pulled out to a certain length and a stable pipe blank is formed, the initiator plug 6 is removed.

[0047] See Figure 3As shown, in an embodiment of the present invention, the traction machine 7 includes a traction machine body 704 and an inner core 701, a first arc-shaped clamping device 702, and a second arc-shaped clamping device 703 disposed on the traction machine body 704. The inner core 701 is located between the first arc-shaped clamping device 702 and the second arc-shaped clamping device 703, and is arranged inside the pipe to form a supporting contact. The first arc-shaped clamping device 702 and the second arc-shaped clamping device 703 are arranged outside the pipe. The inner core 701, the first arc-shaped clamping device 702, and the second arc-shaped clamping device 703 jointly clamp the head of the pipe through surface contact. The traction machine body 704 is used to realize mobile traction. The traction machine body 704 is preferably a tugboat, but other instruments capable of mobile traction can also be used.

[0048] See Figure 6 As shown, in an embodiment of the present invention, the continuous fiber braided sleeve 1 is made of multiple layers of continuous axial fibers and non-axial fibers. The non-axial fibers repeatedly wrap around the multiple layers of axial fibers in a cyclic iterative spatial weaving process to form an interwoven braided sleeve body.

[0049] Specifically, the continuous fiber braided sleeve 1 is preferably made of aramid braided fiber; the continuous fiber braided sleeve 1 has an inner boundary 105 and an outer boundary 106; between the inner boundary 105 and the outer boundary 106, there are a first layer of axial fibers 107, a second layer of axial fibers 108, a third layer of axial fibers 109 up to the Nth layer of axial fibers, and each layer of axial fibers is a continuous fiber; the continuous fiber braided sleeve 1 is provided with non-axial fibers 110, which start from the non-axial fiber starting point 111 and successively pass around the first axial intersection point 112 and the second axial intersection point 113; the non-axial fibers 110 are spatially braided according to the path of winding all axial fibers from the inside out and then winding all axial fibers from the outside in, and the above braiding process is iterated to complete the formation of the braided sleeve.

[0050] See Figure 7As shown, the present invention provides a polyethylene composite pipe manufacturing device, which also includes a continuous fiber braided sleeve manufacturing unit, aiming to achieve simultaneous production of braiding and molding. The continuous fiber braided sleeve manufacturing unit includes a mobile nozzle machine 10, a braiding machine 12, and multiple axial nozzles 11. The braiding machine 12 is suspended above the workshop, and the multiple axial nozzles 11 are fixedly arranged at the workshop floor process station. A heating and feeding system is configured below the workshop floor. The axial nozzles 11 are used to output axial aramid threads 14. The mobile nozzle machine 10 is capable of planar movement and is preferably an AGV mobile device with an aramid granule hopper 16 on it. The mobile nozzle machine 10 is used to output non-axial aramid threads 13. The mobile nozzle machine 10 completes the winding operation between the multiple axial nozzles 11. This solution is particularly suitable for specific application scenarios such as integrated cable-laying engineering vessels. Only two axial nozzles 11 are shown in the attached figure; in actual applications, the number of axial nozzles 11 can reach hundreds. The mobile nozzle machine 10 can replenish liquid or granular aramid raw materials outside the working area of ​​the axial nozzles 11 and can also complete battery pack replacement operations.

[0051] This invention provides a polyethylene-based composite pipe manufacturing device. A ring-shaped forming cavity is formed by the cooperation of a fixed inner diameter core and a fixed outer diameter sleeve. A closed magnetic circuit, composed of inner and outer magnetic action parts, achieves axial position constraint of the components. A flared inlet, consisting of an inlet chamfer and a streamlined head, allows for smooth feeding of the impregnated continuous fiber braided sleeve, reducing fiber damage. Simultaneously, a curing unit can cure and shape the braided sleeve. The coaxial positioning of the fixed inner diameter core and fixed outer diameter sleeve is achieved with the help of an inlet plug, ensuring uniform gap in the forming cavity and effectively improving the pipe forming quality and dimensional accuracy. The device features a compact structure and convenient and reliable assembly and positioning.

[0052] Another embodiment of the present invention provides a method for preparing polyethylene-based composite pipes using the apparatus described above, comprising the following steps:

[0053] S1. Prepare continuous fiber braided sleeve 1;

[0054] S2. The continuous fiber braided sleeve 1 is conveyed to the polyethylene solution tank 3 so that the continuous fiber braided sleeve 1 is immersed in the polyethylene solution.

[0055] S3. The continuous fiber braided sleeve 1, after being impregnated with polyethylene solution, is fed into the annular forming cavity defined by the initiator plug 6, the inner diameter core 5, and the outer diameter sleeve 4.

[0056] S4. The impregnated continuous fiber braided sleeve 1 in the annular forming cavity is cured to obtain a polyethylene composite pipe.

[0057] S5. Use traction machine 7 to clamp the pipe head and pull the pipe out.

[0058] Specifically, the continuous fiber braided sleeve 1 includes multiple layers of axial fibers and non-axial fibers. The multiple layers of axial fibers are arranged between the inner and outer boundaries of the braided sleeve. Each layer of axial fibers is a continuous fiber. The non-axial fibers start from the starting point, pass around the intersection point of the axial fibers in sequence, and repeatedly surround the multiple layers of axial fibers in a path from the inside out and then from the outside in, completing the spatial weaving in a cyclical iteration.

[0059] This forming method first outputs a flattened continuous fiber braided sleeve via a servo unwinding machine. A spatial guide roller guides the sleeve through a transition, and then the flattened shape is smoothly transformed into a cylindrical shape before being fed into the forming cavity through a flared inlet. An initiating plug is used to achieve coaxial positioning of the inner diameter core and the outer diameter sleeve during the initial forming stage. After a certain length of tube blank is pulled out and a stable, continuous output is achieved, the initiating plug is removed and discarded. A closed magnetic circuit maintains the axial position of the component, and the tube is then cured to obtain the final product. This method effectively reduces scratching and fiber damage during the braided sleeve feeding process, ensures uniform and stable gaps in the forming cavity, and produces tubes with good dimensional consistency. It enables continuous, uninterrupted production, is simple to operate, and easy to assemble and debug, thus improving the overall mechanical properties of the finished tube.

[0060] This invention enables the complete production process of aramid fiber preparation, continuous aramid fiber weaving, and continuous aramid fiber reinforced polyethylene pipe. Compared with the axial tensile strength of 160MPa-355MPa of existing aramid fiber reinforced polyethylene composite spiral pipe, the axial tensile strength of the pipe prepared by this invention is increased to 360MPa-380MPa, effectively improving the axial load-bearing capacity of the pipe.

[0061] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A device for preparing polyethylene-based composite pipes, characterized in that, The system includes a servo unwinding machine (2), a polyethylene solution tank (3), a shaping unit, and a traction machine (7). The servo unwinding machine (2) is used to convey a strip of continuous fiber braided sleeve (1) to the polyethylene solution tank (3). A space guide roller (9) is provided inside the polyethylene solution tank (3). After the continuous fiber braided sleeve (1) is immersed in the polyethylene solution in the polyethylene solution tank (3), it is guided out by the space guide roller (9). The shaping unit is located at the discharge end of the polyethylene solution tank (3). The immersed continuous fiber braided sleeve (1) is fed into the shaping unit to be formed into a pipe. The traction machine (7) is arranged on the discharge side of the shaping unit and is used to pull the formed pipe outward.

2. The apparatus for preparing polyethylene-based composite pipes according to claim 1, characterized in that, The shaping unit includes a starter plug (6), a fixed inner diameter core (5), and a fixed outer diameter sleeve (4). The fixed outer diameter sleeve (4) is located at the outlet of the polyethylene solution tank (3). The fixed inner diameter core (5) is inserted inside the fixed outer diameter sleeve (4). The starter plug (6) is assembled at the ends of the fixed inner diameter core (5) and the fixed outer diameter sleeve (4). The fixed outer diameter sleeve (4) and the fixed inner diameter core (5) enclose each other to form an annular molding cavity. The inner wall of the fixed outer diameter sleeve (4) is provided with a curing device (405) and an external magnetic action part. The curing device (405) is used to cure the impregnated continuous fiber braided sleeve (1) into a solid state. The fixed inner diameter core (5) is provided with an inner magnetic action part, which cooperates with the outer magnetic action part to form a closed magnetic circuit between the fixed inner diameter core (5) and the fixed outer diameter sleeve (4); the closed magnetic circuit generates a magnetic constraint force to maintain the axial relative position of the fixed inner diameter core (5) and the fixed outer diameter sleeve (4).

3. The apparatus for preparing polyethylene-based composite pipes according to claim 2, characterized in that, The external magnetic working part includes an external N pole (402) and an external S pole (403); the internal magnetic working part includes an internal S pole (503) and an internal N pole (504), wherein the internal S pole (503) and the external N pole (402) are positioned opposite each other, and the internal N pole (504) and the external S pole (403) are positioned opposite each other; The outer N pole (402), continuous fiber braided sleeve (1), inner S pole (503), fixed inner diameter core (5), inner N pole (504), continuous fiber braided sleeve (1), outer S pole (403) and fixed outer diameter sleeve (4) together constitute the closed magnetic circuit.

4. The apparatus for preparing polyethylene-based composite pipes according to claim 2, characterized in that, The feed end of the fixed outer diameter sleeve (4) is provided with an inlet chamfer (404); the feed end of the fixed inner diameter core (5) is provided with a streamline head (501); the inlet chamfer (404) and the streamline head (501) cooperate to form the flared inlet of the annular forming cavity.

5. The apparatus for preparing polyethylene-based composite pipes according to claim 2, characterized in that, The opening plug (6) includes a connecting body (603), a fixed inner diameter core connecting part (601) disposed at the center of the connecting body (603), and a fixed outer diameter sleeve connecting part (602) disposed on the outside of the connecting body (603); the fixed inner diameter core connecting part (601) is positioned and connected to the center positioning hole on the end face of the fixed inner diameter core (5); the fixed outer diameter sleeve connecting part (602) is an annular structure concentrically disposed with the fixed inner diameter core connecting part (601), and the fixed outer diameter sleeve connecting part (602) is positioned and connected to the end of the fixed outer diameter sleeve (4).

6. The apparatus for preparing polyethylene-based composite pipes according to claim 2, characterized in that, The traction machine (7) includes a traction machine body (704) and an inner core (701), a first arc-shaped clamp (702), and a second arc-shaped clamp (703) disposed on the traction machine body (704). The inner core (701) is located between the first arc-shaped clamp (702) and the second arc-shaped clamp (703). The inner core (701) is arranged inside the pipe to form a supporting contact. The first arc-shaped clamp (702) and the second arc-shaped clamp (703) are arranged outside the pipe. The inner core (701), the first arc-shaped clamp (702), and the second arc-shaped clamp (703) clamp the head of the pipe together through surface contact. The traction machine body (704) is used to realize mobile traction.

7. The apparatus for preparing polyethylene-based composite pipes according to claim 2, characterized in that, The continuous fiber braided sleeve (1) is made of multiple layers of continuous axial fibers and non-axial fibers. The non-axial fibers repeatedly wrap around the multiple layers of axial fibers in a cyclical and iterative spatial weaving process to form an interwoven braided sleeve body.

8. The apparatus for preparing polyethylene-based composite pipes according to claim 2, characterized in that, It also includes a continuous fiber braided sleeve preparation unit; The continuous fiber braided sleeve preparation unit includes a mobile nozzle machine (10), a braiding machine (12), and multiple axial nozzles (11). The braiding machine (12) is suspended above the workshop, and the multiple axial nozzles (11) are fixedly arranged at the process station on the workshop floor. A heating and feeding system is configured below the workshop floor. The axial nozzles (11) are used to output axial aramid yarns (14). The mobile nozzle machine (10) is capable of planar movement. The mobile nozzle machine (10) is equipped with an aramid granule hopper (16). The mobile nozzle machine (10) is used to output non-axial aramid yarns (13). The mobile nozzle machine (10) completes the winding operation between the multiple axial nozzles (11).

9. A method for preparing polyethylene-based composite pipes using the apparatus according to any one of claims 2-8, characterized in that, Includes the following steps: S1. Preparation of continuous fiber braided sleeve (1). S2. The continuous fiber braided sleeve (1) is conveyed to the polyethylene solution tank (3) so that the continuous fiber braided sleeve (1) is immersed in the polyethylene solution; S3. The continuous fiber braided sleeve (1) after being impregnated with polyethylene solution is fed into the annular forming cavity defined by the initiator plug (6), the inner diameter core (5) and the outer diameter sleeve (4); S4. The impregnated continuous fiber braided sleeve (1) in the annular forming cavity is cured to obtain a polyethylene composite pipe. S5. Use a traction machine (7) to clamp the head of the pipe and pull the pipe out.

10. The method for preparing polyethylene-based composite pipes according to claim 9, characterized in that, The continuous fiber braided sleeve (1) includes multiple layers of axial fibers and non-axial fibers. The multiple layers of axial fibers are arranged between the inner and outer boundaries of the braided sleeve. Each layer of axial fibers is a continuous fiber. The non-axial fibers start from the starting point, pass around the intersection of the axial fibers in sequence, and repeatedly surround the multiple layers of axial fibers in a path from the inside out and then from the outside in, to complete the spatial weaving in a cyclic iteration.

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