A continuous winding thermoplastic composite pipe production device and operating method

Abstract

A continuous winding thermoplastic composite pipe production device and operation method belong to the technical field of thermoplastic composite production, and the continuous fiber impregnation device is used for on-line compounding of thermoplastic resin and continuous fiber to form a continuous fiber belt in a molten state; the thickness and width control unit is used for real-time adjustment of the thickness and width of the continuous fiber belt; the angle adjustment unit is used for adjusting the relative angle between the continuous fiber impregnation device and the continuous winding center shaft; the temperature integrated adjustment module is used for realizing integrated temperature management from high-temperature winding to step-by-step cooling and solidification; and the surface treatment unit is used for finishing the surface of the wound pipe, wherein the device does not contain a resin spraying device and a short-cut fiber dispersion arrangement device, cancels the traditional process link, realizes integrated continuous production from impregnation to finished product, and can realize 100% recycling of the product, can reduce energy consumption, can greatly shorten the production cycle, and can improve the interlayer shear strength and the hoop strength of the pipe.

Description

Technical Field

[0001] This invention belongs to the field of thermoplastic composite material production technology, and specifically relates to a continuous winding thermoplastic composite material pipe production device and its operation method. Background Technology

[0002] Continuously wound composite material pipes have been widely used in municipal water supply and drainage, chemical pipelines, and marine engineering due to their outstanding advantages such as lightweight, high strength, corrosion resistance, and long service life. Currently, industrially produced continuously wound composite material steel pipes mainly use thermosetting resins (such as unsaturated polyester resin, epoxy resin, vinyl ester resin, etc.) as the matrix material, combined with continuous fiber reinforcement materials, and are formed according to the process route of "resin spraying + short fiber dispersion + continuous winding + post-curing".

[0003] However, the aforementioned existing technologies have the following obvious shortcomings: (1) Thermosetting products are difficult to recycle, and environmental pressure is increasing. Once thermosetting resins cure, they form a three-dimensional cross-linked network structure that cannot be remelted and processed. Waste composite steel pipes can only be landfilled or crushed, wasting resources and polluting the environment. With increasingly stringent environmental regulations, the development of recyclable thermoplastic composite pipes has become an urgent need for the industry.

[0004] (2) Thermosetting molding process is complex and requires high equipment investment. Traditional continuous winding production lines require a large number of devices, including resin spraying equipment, chopped fiber dispersion and arrangement equipment, resin tanks, and curing ovens. The process is cumbersome and requires a large area. During the resin spraying process, material losses such as dripping and splashing often occur, and the uniformity of chopped fiber dispersion is also difficult to control, which has a significant impact on the stability of product quality.

[0005] (3) Existing thermoplastic composite winding technology still has process limitations. To overcome the non-recyclability of thermosetting materials, some technical solutions attempt to use thermoplastic resins to make wound tubes. Existing thermoplastic winding technologies mainly fall into two categories: Offline prepreg method: Thermoplastic prepreg tape is prepared in advance, then heated and melted by an unwinding device before being wound onto a mandrel. Post-heating curing or cooling demolding is then performed. For example, patent CN103802325B discloses a thermoplastic fiber winding pipe equipment that uses an infrared heater to preheat the prepreg tape, and the mandrel is also equipped with a heater, but it still involves a long series of steps: "unwinding → preheating → melting → winding → rolling → cooling." Patent CN102205633B discloses a heating device for a two-step winding molding of fiber-reinforced thermoplastic polymers, which ultimately still follows a segmented process of "preheating + winding + post-curing."

[0006] Online impregnation and winding method: A few solutions attempt to integrate extrusion impregnation and winding together, but they still retain complex structures such as multi-stage feeding and multiple heating. Temperature management is mostly based on the idea of ​​"heating and heat preservation", which requires separate secondary heating or curing ovens. The production cycle is long and the energy consumption is high.

[0007] In summary, existing technologies generally suffer from the following common problems: ① The process route is still a "two-step" or "multi-step" method, which means that the preparation of fiber-reinforced materials (whether prepreg tape or online) is done separately from winding and post-curing, which makes the process connection troublesome and the production efficiency low; ② Most temperature control schemes follow a fluctuating pattern of "preheating → winding → post-heating → cooling", lacking continuous temperature gradient management from high-temperature winding to gradual cooling and curing, let alone integrating heating and cooling together, which easily leads to problems such as poor interlayer adhesion and residual stress. ③ The thickness and width of the fiber tape are usually determined during the preparation stage, and cannot be adjusted in real time during the winding process, resulting in very poor flexibility; ④ The relative angle between the impregnation device or fiber guiding mechanism and the winding center axis is either fixed or can only be finely adjusted, making it difficult to achieve symmetrical arrangement on both sides and independent / synchronous adjustment at multiple angles, thus making it impossible to flexibly adjust the ratio of circumferential strength and axial strength of the pipeline. ⑤ Some solutions still retain traditional process steps such as resin spraying and short fiber dispersion, failing to fundamentally simplify the process.

[0008] (4) Lack of integrated temperature and cooling management solution In existing thermoplastic winding technologies, curing often relies on a separate heating process after winding (such as a curing oven or infrared heater for reheating), while cooling is either natural cooling or forced water mist for rapid single-zone cooling. Heating and cooling are two distinct stages. This not only increases equipment investment and energy consumption, but this "heating-cooling-reheating" process can easily lead to inconsistent thermal histories of thermoplastic materials, affecting the crystallinity and mechanical property stability of the pipe. To date, no publicly available technology has been found that integrates high-temperature bonding, medium-temperature trimming, low-temperature shaping, and segmented water mist cooling into a single temperature management module, achieving an integrated solution of "high-temperature winding at no less than 200℃ + gradual cooling curing."

[0009] In summary, developing a continuous winding thermoplastic composite pipe production device and its operation method that can completely eliminate the resin spraying and short fiber dispersion process, achieve online dynamic control of thickness / width, adopt a double-sided angle adjustable layout, and integrate "high-temperature winding + gradual cooling" integrated temperature management (including segmented water mist step-by-step cooling) is indeed a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0010] This invention provides a production apparatus and operating method for continuously wound thermoplastic composite pipes, which can solve the problems pointed out in the background art.

[0011] A continuous winding thermoplastic composite pipe production apparatus includes a continuous winding central shaft, a continuous fiber impregnation device, a thickness and width control unit, an angle adjustment unit, an integrated temperature adjustment module, and a surface treatment unit. Continuous winding center shaft: used to provide base support for pipe forming; driven by a drive component to rotate and advance along the axial direction; Continuous fiber impregnation device: disposed on at least one side of the continuous winding central shaft, for online composite of thermoplastic resin and continuous glass fiber to form a continuous fiber strip in a molten state; Thickness and width control unit: connected to the outlet end of the continuous fiber impregnation device, used to adjust the thickness and width of the continuous fiber belt in real time; Angle adjustment unit: connected between the continuous fiber impregnation device and the continuous winding central shaft 1, used to adjust the relative angle between the continuous fiber impregnation device and the continuous winding central shaft; Integrated temperature control module: Arranged along the advancing direction of the continuous winding center axis, including a high-temperature bonding zone, a medium-temperature trimming zone, and a low-temperature setting zone, used to achieve integrated temperature management from high-temperature winding to gradual cooling and curing; Surface treatment unit: Located at the rear of the continuous winding center shaft, it includes a semi-enclosed protective chamber at the rear end of the travel process and a surface treatment pressure roller device at the front end, used to finish the surface of the pipe after winding.

[0012] Preferably, continuous fiber impregnation devices are provided on both sides of the continuous winding central shaft, referred to as the first continuous fiber impregnation device and the second continuous fiber impregnation device, respectively; the thickness and width control unit includes a first thickness and width control unit and a second thickness and width control unit, and the angle adjustment unit includes a first angle adjustment unit and a second angle adjustment unit. The first thickness and width control unit, the second thickness and width control unit, the first angle adjustment unit, and the second angle adjustment unit are respectively provided corresponding to the first continuous fiber impregnation device and the second continuous fiber impregnation device.

[0013] Preferably, the continuous fiber impregnation device includes a fiber introduction and unfolding preheating module, a first-stage injection module, an impregnation module, a fiber layer superposition reinforcement module, a second-stage injection module, and a scraper trimming module arranged sequentially along the fiber travel direction. Fiber introduction and unfolding preheating module: The fiber introduction and unfolding preheating module includes an arc-shaped interlaced fiber dispersing device and an electric heating preheating device preset at the inlet end; the arc-shaped interlaced fiber dispersing device includes two first arc-shaped dispersing rollers and second arc-shaped dispersing rollers arranged in a staggered manner along the fiber travel direction, and the roller surfaces of the first arc-shaped dispersing rollers and the second arc-shaped dispersing rollers are provided with arc-shaped protrusions in the middle. First-stage injection module: includes an injection device; the injection device is connected to a screw extruder injection machine via a connecting pipe, the injection port of the injection device is located at the bottom, the injection device has a fan-shaped dispersion cavity, the fan-shaped dispersion cavity has a fan-shaped dispersion structure with a fan angle of 60~120°, the injection port is connected to the fan-shaped dispersion cavity, and the diffusion is fan-shaped from the injection port at the bottom to the top, the top of the fan-shaped diffusion area is provided with an arc-shaped baffle, and resin flow channels are evenly distributed on the arc-shaped baffle along the fan angle direction.

[0014] Impregnation module: includes an upper mold, a lower mold, and an intermediate flow channel structure. The upper mold and the lower mold are alternately provided with triangular or trapezoidal protrusions and grooves along the fiber travel direction. The top of the protrusion is a rounded transition structure, and the groove between adjacent protrusions forms a local pressure reduction zone. When the fiber bundle passes through the protrusion, it is radially compressed. After entering the groove, the pressure drops sharply, forming a pressure pulsation process of "compression-decompression-recompression". Fiber layered overlapping reinforcement module: includes a multi-level yarn splitting module and a gradient shrinkage cavity body; the multi-level yarn splitting module is divided into three-level yarn splitting units, namely the first-level yarn splitting unit, the second-level yarn splitting unit, and the third-level yarn splitting unit, which are respectively set at the beginning, middle section, and end of the gradient shrinkage cavity body; the gradient shrinkage cavity body includes a macroscopic cavity outline and a microscopic texture on the cavity surface. The macroscopic cavity outline has a height gradient protrusion structure along the fiber travel direction, with the height at the cavity inlet end being greater than the height at the cavity outlet end, and the middle height being greater than the height on both sides; the gradient shrinkage cavity body is provided with a dispersed glue injection port, and the microscopic texture on the cavity surface consists of multiple uniformly arranged arc-shaped grooves distributed in the transverse direction.

[0015] Second-stage injection module: Located between the first-stage yarn splitting unit and the second-stage yarn splitting unit, including an independent heating jacket, a temperature sensor, a second-stage injection main structure, and a second-stage discharge port.

[0016] Scraper trimming module: Located at the cavity exit end, used to smooth the surface of the impregnated fiber tape.

[0017] Preferably, the thickness and width control unit is located at the outlet end of the continuous fiber impregnation device, and includes a thickness and width control frame and a thickness control mechanism and a width control mechanism arranged front and rear within the thickness and width control frame. The thickness control mechanism includes an upper L-shaped pressure block and a lower L-shaped pressure block arranged symmetrically to form a first channel gap. The upper L-shaped pressure block and the lower L-shaped pressure block are slidably connected to the thickness and width control frame through sliding elongated holes, and are reciprocated in the thickness direction by a thickness drive member connected to the thickness and width control frame. The width control mechanism includes a left L-shaped pressure block and a right L-shaped pressure block arranged symmetrically to form a second channel gap. The second channel gap is arranged front and rear corresponding to the first channel gap. The left L-shaped pressure block and the right L-shaped pressure block are guided and slid left and right by a guide rod and a guide hole, and are reciprocated by a width drive member connected to the thickness and width control frame. The width drive member and the thickness drive member are cylinders or hydraulic cylinders.

[0018] Preferably, the angle adjustment unit includes a rotary support frame, a rotary drive motor, a rotary disk, and a manual worm gear; the rotary drive motor is disposed inside the rotary support frame and drives the rotary disk at the lower end of the rotary support frame to rotate, the rotary disk is connected to the continuous fiber impregnation device, and the manual worm gear is connected to the upper end of the rotary support frame to realize manual and electric adjustment.

[0019] Preferably, the medium-temperature trimming zone and the low-temperature shaping zone adopt a step-down cooling structure, specifically, at least two independent cooling zones are set along the pipeline travel direction. The high-temperature bonding zone is equipped with a high-temperature bonding heating device and a temperature detection and control device; the medium-temperature trimming zone is equipped with a medium-temperature trimming spray cooling device; and the low-temperature shaping zone is equipped with a low-temperature shaping upper spray cooling device and a low-temperature shaping lower spray cooling device.

[0020] Preferably, the surface treatment unit is located in the rear section of the intermediate temperature trimming zone. The semi-enclosed protective chamber includes a main protective chamber structure and an observation window. The main protective chamber structure has open sides to provide a feeding channel for the continuous winding central shaft. The surface treatment pressure roller device includes a tapered pressure roller, an electric push rod, and a pressure roller frame. The tapered pressure roller is mounted on a tapered rod, which is inclined. The electric push rod is fixed to the pressure roller frame, and its movable end abuts against the tapered pressure roller. The tapered pressure roller is attached to the continuous winding central shaft.

[0021] An operation method for a continuously wound thermoplastic composite pipe production apparatus includes the following steps: S1. Continuous fibers are combined with thermoplastic resin online through a continuous fiber impregnation device to form a continuous fiber belt in a molten state, with an outlet temperature of not less than 200℃. S2. The thickness and width of the continuous fiber strip are adjusted in real time by the thickness and width control unit; S3. Adjust the continuous fiber impregnation device to the preset winding angle through the angle adjustment unit so that the molten continuous fiber strip is continuously wound onto the surface of the continuous winding center shaft in a circumferential interlocking manner. S4. The integrated temperature control module implements integrated temperature management of the pipeline during the winding process, so that the pipeline passes through the high temperature bonding zone, the medium temperature trimming zone and the low temperature shaping zone in sequence. The medium temperature trimming zone and the low temperature shaping zone adopt a segmented water mist cooling method, so that the pipeline can directly complete bonding, curing and shaping and gradual cooling during the winding process. S5. The pipe after temperature gradient curing is introduced into the semi-enclosed protective chamber of the surface treatment unit. The surface treatment pressure roller device is used to elastically trim the pipe surface, so that the pipe temperature drops to ≤50℃, and the final curing is completed. Preferably, in step S3, the overlap width of the circumferential staggered overlap is 5~10mm, and the fiber bands between adjacent loops are staggered in the width direction; in step S4, the temperature of the high-temperature bonding zone is 200~300℃, the temperature of the medium-temperature trimming zone is 150~200℃, the temperature of the low-temperature setting zone is 50~150℃, and the temperature gradient is 5~30℃ / cm; the cooling rate of the segmented water mist cooling stepwise is 20~50℃ / min.

[0022] Preferably, in step S5, when the surface treatment roller device trims the pipe surface, the pipe surface temperature is 150~200℃; after trimming, the pipe surface roughness Ra is reduced to 1.6~3.2μm.

[0023] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention completely eliminates the resin spraying device, chopped fiber dispersion device, and post-curing oven in the traditional continuous winding fiberglass pipe production process, shortening the production line length by more than 30% and reducing equipment investment by 40-60%. Simultaneously, it eliminates material losses such as dripping and splashing during the resin spraying process, increasing material utilization by 15-25%; it also eliminates the quality risks associated with uncontrolled uniformity of chopped fiber dispersion, significantly improving product stability.

[0024] 2. The product is 100% recyclable and environmentally friendly. Using thermoplastic resin as the matrix material, discarded pipes can be reprocessed and molded through heating and melting, achieving resource recycling and meeting increasingly stringent environmental regulations. The production process does not involve the emission of small-molecule volatiles produced during the curing of thermosetting resins, resulting in a more environmentally friendly operating environment.

[0025] 3. Real-time online thickness / width control, enabling high production flexibility. By using a thickness pressure roller and a thickness lifting control device installed at the outlet of the continuous fiber impregnation device, the thickness and width of the continuous fiber strip can be dynamically adjusted in real time within the range of 0.5~5mm during the winding process. There is no need to stop the machine to replace the prepreg or adjust the mold. The specification switching time is shortened by more than 80%, which can meet the wall thickness control requirements of pipes with different pressure levels.

[0026] 4. Adjustable angle on both sides, flexible layer design The continuous fiber impregnation device can be placed on both sides of the continuous winding central shaft, and can be manually or electrically adjusted within the range of 0~90° via an angle adjustment unit. The devices on both sides can be controlled independently or synchronously. This allows for simultaneous winding on both sides at the same angle to improve production efficiency, or for multi-layer composite lay-up at different angles, such as circumferential inner layers and spiral outer layers. This enables the production of various structural types of pipes without changing equipment.

[0027] 5. Integrated temperature gradient curing reduces energy consumption and shortens the cycle time. This invention employs an integrated temperature management scheme of "high-temperature winding at no less than 200℃ + gradual cooling and curing." A continuous temperature gradient of 5-30℃ / cm is formed by setting a high-temperature bonding zone (200-300℃), a medium-temperature trimming zone (150-200℃), and a low-temperature setting zone (50-150℃) along the continuous winding central axis. The medium-temperature trimming zone and the low-temperature setting zone incorporate segmented water mist cooling functions. At least two independent cooling zones are set along the pipeline's direction of travel, controlling the cooling rate at 20-50℃ / min. This allows the thermoplastic material to undergo a gradual temperature change from a semi-molten state (150-200℃) to a low-temperature setting state (50-150℃), forming a continuous "heating-transition-cooling" temperature curve without abrupt changes.

[0028] Compared with the existing two-step thermoplastic winding process, this invention can significantly shorten the production cycle and reduce production energy consumption; it eliminates the problems of internal stress and imperfect crystallization caused by rapid cooling, and can effectively improve the interlayer shear strength and circumferential strength of the pipe.

[0029] 6. Online surface finishing significantly improves quality. This invention performs surface finishing on pipelines within a semi-enclosed protective chamber. The chamber creates a controlled microenvironment for the pipeline during the transition from the winding station to the cooling station, preventing dust and oil contamination, slowing heat loss, and avoiding interlayer stress caused by sudden temperature drops. The tapered pressure roller structure utilizes a small taper at the inlet end for gradual guidance, avoiding impact damage and surface indentations. The tapered guide, combined with an elastic contact mechanism, can adapt to natural fluctuations within a certain range of the pipeline without manual intervention. The cylindrical surface at the rear provides uniform pressure, and the anti-stick coating reduces the pipeline surface roughness Ra to 1.6~3.2μm, a significantly better effect than traditional pressure roller finishing. The anti-stick coating also effectively prevents resin residue from adhering to the pressure roller, extending the cleaning cycle and reducing maintenance costs. Compared to existing two-step processes, this eliminates the need for subsequent secondary heating or separate curing oven treatment, further simplifying the production process.

[0030] 7. The product has excellent comprehensive mechanical properties. Thermoplastic resin matrix itself has relatively high elongation at break and impact resistance, resulting in significantly improved toughness and impact strength compared to thermosetting fiberglass pipes. This allows the pipes to withstand dynamic loads during transportation, installation, and use. Continuous fibers are fully impregnated in molten resin, significantly reducing porosity and achieving a fiber volume content of 40-75%, ensuring excellent circumferential strength and axial stiffness.

[0031] 8. High degree of production automation and controllable process The thickness and width control unit, angle adjustment unit, and integrated temperature control module are linked with the feed speed of the continuous winding central shaft for coordinated control. Closed-loop adjustment via PLC or industrial computer allows for real-time monitoring and automatic correction of process parameters, ensuring consistent product quality. This system also supports online switching between various thermoplastic resin systems (polypropylene, polyethylene, nylon 6, polyvinyl chloride, etc.) to adapt to the material requirements of different application scenarios.

[0032] Overall, this invention has made substantial progress in terms of process simplification, energy conservation and emission reduction, flexible production, product performance and environmental protection, and has great industrial application value and promotion prospects. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of a continuously wound thermoplastic composite pipe production device according to the present invention; Figure 2 This is a schematic diagram of the overall transverse structure of a continuously wound thermoplastic composite pipe production device according to the present invention; Figure 3 This is a schematic diagram of the overall longitudinal structure of a continuously wound thermoplastic composite pipe production device according to the present invention; Figure 4 This is a schematic diagram of the overall structure of the continuous fiber impregnation device of the present invention; Figure 5 This is a longitudinal cross-sectional schematic diagram of the overall structure of the continuous fiber impregnation device of the present invention; Figure 6 This is a schematic diagram of the overall structure of the fiber introduction and unfolding preheating module of the present invention; Figure 7 This is a schematic cross-sectional view of the overall structure of the fiber introduction and unfolding preheating module of the present invention; Figure 8 This is a schematic cross-sectional view of the overall structure of the first-order injection module of the present invention; Figure 9 This is a schematic diagram of the overall structure of the impregnation module of the present invention; Figure 10 This is a longitudinal cross-sectional view of the overall structure of the impregnation module of the present invention; Figure 11 This is a schematic cross-sectional view of the overall structure of the impregnation module of the present invention; Figure 12 This is a schematic diagram of the upper mold structure of the impregnation module of the present invention; Figure 13 This is a schematic diagram of the lower mold structure of the impregnation module of the present invention; Figure 14 This is a schematic diagram of the overall structure of the fiber layer stacked reinforcement module of the present invention; Figure 15 This is a longitudinal cross-sectional schematic diagram of the overall structure of the fiber layered superimposed reinforcement module of the present invention; Figure 16 This is a schematic diagram of the overall structure of the second-stage injection module of the present invention; Figure 17 This is a schematic diagram of the scraper structure of the present invention; Figure 18 This is a front view schematic diagram of the overall structure of the thickness and width control unit of the present invention; Figure 19 This is a rear view schematic diagram of the overall structure of the thickness and width control unit of the present invention; Figure 20 This is a schematic diagram of the overall structure of the angle adjustment unit of the present invention; Figure 21 This is a schematic diagram of the tapered pressure roller structure of the present invention; Figure 22 This is a schematic cross-sectional view of the low-temperature shaping zone of the present invention; In the diagram, 1: Continuous winding central shaft; 2: Continuous fiber impregnation device; 3: Thickness and width control unit; 4: Angle adjustment unit; 5: Integrated temperature control module; 6: Surface treatment unit; 2-1: First continuous fiber impregnation device; 2-2: Second continuous fiber impregnation device; 3-1: First thickness and width control unit; 3-2: Second thickness and width control unit; 4-1: First angle adjustment unit; 4-2: Second angle adjustment unit; 5-1: High-temperature bonding zone; 5-2: Medium-temperature trimming zone; 5-3: Low-temperature setting zone; 6-1: Semi-enclosed protective chamber; 6-2: Tapered pressure roller structure; 210: Fiber introduction and unfolding preheating module; 210-1: First arc-shaped dispersing roller; 210-2: Second arc-shaped dispersing roller; 210-3: Electric heating preheating device; 211: First-stage injection module; 211-1 Injection device; 211-10 Fan-shaped dispersion device; 211-11 Arc-shaped dispersion baffle; 211-12 Injection port; 212 Impregnation module; 212-1 Upper mold; 212-2 Lower mold; 212-3 Flow channel structure; 212-4 Protruding tooth and groove structure; 213 Fiber layer overlapping reinforcement module; 213-1 Multi-stage yarn separation module; 213-10 First-stage yarn separation unit; 213-11 Second-stage yarn separation unit; 213-12 Third-stage yarn separation unit; 213-2 Main cavity structure; 213-20 Cavity structure inlet end; 213-21 Cavity structure outlet end; 213-22: Dispersion injection port; 214: Second-stage injection module; 214-1: Heating jacket; 214-2: Temperature sensor; 214-3: Second-stage injection main structure; 214-4: Second-stage discharge port; 215: Scraper trimming module; 310: Thickness and width control frame; 311: Upper L-shaped pressure block; 312: Lower L-shaped pressure block; 313: First channel gap; 314: Sliding elongated hole; 315: Thickness drive component; 316: Left L-shaped pressure block; 317: Right L-shaped pressure block; 318: Second channel gap; 319: Guide rod; 320: Guide hole; 321: Width drive component; 4-1: Slewing bearing structure; 4-2: Servo drive motor; 410: Rotary support frame; 420: Rotary drive motor; 430: Rotary disc; 440: Manual worm gear; 510: High-temperature bonding heating device; 511: Temperature detection and control device; 520: Medium-temperature finishing spray cooling device; 530: Low-temperature setting upper spray cooling device; 531: Low-temperature setting lower spray cooling device; 610: Main structure of protective chamber; 611: Observation window; 620: Pressure roller; 621: Electric push rod; 622: Taper rod; 623: Pressure roller frame. Detailed Implementation

[0034] The following detailed description of a specific embodiment of the present invention is provided in conjunction with the accompanying drawings. However, it should be understood that the scope of protection of the present invention is not limited to the specific embodiment.

[0035] like Figure 1 As shown in the figure, the continuous winding thermoplastic composite pipe production device provided by the present invention includes a continuous winding central shaft 1, a continuous fiber impregnation device 2, a thickness and width control unit 3, an angle adjustment unit 4, a temperature integrated adjustment module 5, and a surface treatment unit 6. Continuous winding center shaft 1: 12m in length and 300mm in outer diameter, driven by a servo motor to rotate and advance along the axial direction; the continuous winding center shaft is one of the basic components in fiberglass mechanical winding equipment. This invention adds the above-mentioned corresponding devices, units and modules to the continuous winding center shaft 1 of the fiberglass mechanical winding equipment. Continuous fiber impregnation device 2: disposed on at least one side of the continuous winding central shaft 1, for online composite of thermoplastic resin and continuous glass fiber to form a continuous fiber strip in a molten state; Thickness and width control unit 3: connected to the outlet end of the continuous fiber impregnation device 2, used to adjust the thickness and width of the continuous fiber belt in real time; Angle adjustment unit 4: connected between the continuous fiber impregnation device 2 and the continuous winding central shaft 1, used to adjust the relative angle between the continuous fiber impregnation device 2 and the continuous winding central shaft 1; Temperature integrated regulation module 5: Arranged along the advancing direction of the continuous winding center axis 1, including a high-temperature bonding area 5-1, a medium-temperature trimming area 5-2 and a low-temperature shaping area 5-3, used to realize integrated temperature management from high-temperature winding to gradual cooling and curing; Surface treatment unit 6: Located at the rear end of the continuous winding center shaft 1, including a semi-enclosed protective chamber 6-1 at the rear end of the travel process and a surface treatment pressure roller device 6-2 at the front end, used to trim the surface of the pipe after winding.

[0036] In this embodiment, continuous fiber impregnation devices 2 are provided on both sides of the continuous winding central shaft 1, respectively referred to as the first continuous fiber impregnation device 2-1 and the second continuous fiber impregnation device 2-2; the thickness and width control unit 3 includes the first thickness and width control unit 3-1 and the second thickness and width control unit 3-2; the angle adjustment unit 4 includes the first angle adjustment unit 4-1 and the second angle adjustment unit 4-2; the first thickness and width control unit 3-1 and the second thickness and width control unit 3-2, as well as the first angle adjustment unit 4-1 and the second angle adjustment unit 4-2, are respectively provided corresponding to the first continuous fiber impregnation device 2-1 and the second continuous fiber impregnation device 2-2.

[0037] Each continuous fiber impregnation device has the same structure, and the following is in accordance with... Figures 1-22 The structure shown will be explained in detail.

[0038] 1. Continuous fiber impregnation device The continuous fiber impregnation device consists of the following parts arranged sequentially along the fiber travel direction: The continuous fiber impregnation device 2 includes a fiber introduction and unfolding preheating module 210, a first-stage injection module 211, an impregnation module 212, a fiber layer superposition reinforcement module 213, a second-stage injection module 214, and a scraper trimming module 215 arranged sequentially along the fiber travel direction. Fiber introduction and unfolding preheating module 210: The fiber introduction and unfolding preheating module 210 includes an arc-shaped interlaced fiber dispersing device and an electric preheating device 210-3 pre-set at the inlet end; the arc-shaped interlaced fiber dispersing device includes two arc-shaped dispersing rollers 210-1 and 210-2 arranged in a staggered manner along the fiber travel direction, and the roller surfaces of the first arc-shaped dispersing roller 210-1 and the second arc-shaped dispersing roller 210-2 are both provided with arc-shaped protrusions in the middle; the radius of curvature of the first arc-shaped dispersing roller 210-1 is 80mm, the radius of curvature of the second arc-shaped dispersing roller 210-2 is 100mm, and the electric preheating device 210-3 preheats the fiber bundle to 120℃.

[0039] First-stage injection module 211: includes injection device 211-1; the injection device 211-1 is connected to a screw extruder injection machine via a connecting pipe, the injection connection port 211-12 of the injection device 211-1 is located at the bottom, the injection device 211-1 has a fan-shaped dispersion cavity 211-10, the fan-shaped dispersion cavity 211-10 has a fan-shaped dispersion structure with a fan angle of 60~120°, and the injection connection port 211-12 is connected to... The fan-shaped dispersion chamber 211-10 is connected, and the material diffuses in a fan shape from the bottom injection port 211-12 to the top. An arc-shaped baffle 211-11 is provided at the top of the fan-shaped diffusion area. Resin channels are evenly distributed on the arc-shaped baffle 211-11 along the fan-shaped angle. Polypropylene resin with a melt index of 10g / 10min is melted using a screw extrusion injection machine under test conditions of 230℃ / 2.16kg, and the extrusion temperature is set to 220℃. A flexible connecting pipe is connected to the injection device 211-1. The bottom injection port of the injection device is connected to the impregnation chamber 211-10, with a fan-shaped angle of 90°. Nineteen resin channels are evenly distributed on the top arc-shaped baffle 211-11.

[0040] Impregnation module 212 includes an upper mold 212-1, a lower mold 212-2, and an intermediate flow channel structure 212-3. The upper mold 212-1 and the lower mold 212-2 are alternately equipped with triangular or trapezoidal protrusions and grooves 212-4 along the fiber travel direction. The tops of the protrusions have a rounded transition structure, and the grooves between adjacent protrusions form local pressure reduction zones. The protrusion height is 3mm, the spacing is 6mm, the radius of the rounded arc at the top of the protrusion is R=1mm, and the flow channel length is 800mm. The polypropylene melt forms a pressure pulsation of "compression-decompression-recompression" between the protrusions and grooves.

[0041] Fiber layered overlapping reinforcement module 213: includes a multi-level yarn splitting module 213-1 and a gradient shrinkage cavity body 213-2; the multi-level yarn splitting module 213-1 is divided into three-level yarn splitting units, namely the first-level yarn splitting unit 213-10, the second-level yarn splitting unit 213-11, and the third-level yarn splitting unit 213-12, which are respectively set at the beginning, middle section, and end of the gradient shrinkage cavity body 213-2; the gradient shrinkage cavity body 213-2 includes a macroscopic cavity outline and a microscopic texture on the cavity surface. The macroscopic cavity outline has a height-gradiently changing boss structure along the fiber travel direction. The height of the cavity inlet end 213-20 is greater than the height of the cavity outlet end 213-21, and the middle height is greater than the heights on both sides; the gradient shrinkage cavity body 213-2 is provided with a dispersed glue injection port 213-22, and the microscopic texture on the cavity surface consists of multiple uniformly arranged arc-shaped grooves distributed in the transverse direction.

[0042] The gradient shrinkage cavity body has an inlet height of 8mm (213-20) and an outlet height of 4mm (213-21). The central boss is 5mm high, and the side bosses are 3mm high. The cavity surface has evenly distributed arc-shaped grooves in the transverse direction, with a groove depth of 0.5mm and a spacing of 2mm. The first-stage yarn separating unit 213-10 of the multi-stage yarn separating module 213-1 is located at the beginning of the cavity, the second-stage yarn separating unit 213-11 is located at the midpoint of the length from the inlet to the outlet, and the third-stage yarn separating unit 213-12 is located at the outlet.

[0043] The second-stage injection module 214 is located between the first-stage yarn separating unit 213-10 and the second-stage yarn separating unit 213-11, at 2 / 5 of the total length of the cavity. It includes an independent heating jacket 214-1, a temperature sensor 214-2, a second-stage injection main structure 214-3, and a second-stage discharge port 214-4. The independent heating jacket 214-1 controls the temperature of the second polypropylene melt at 245℃, which is 15℃ higher than the cavity matrix temperature of 230℃.

[0044] Scraper trimming module 215: Located at the cavity exit end 213-21, it is used to smooth the surface of the impregnated fiber tape. The scraper gap is 0.6-2.5mm to smooth the surface of the impregnated fiber tape.

[0045] 2. Thickness and width control unit The thickness and width control unit 3 is located at the outlet end of the continuous fiber impregnation device 2, and includes a thickness and width control frame 310 and a thickness control mechanism and a width control mechanism arranged front and rear within the thickness and width control frame 310. The thickness control mechanism includes an upper L-shaped pressure block 311 and a lower L-shaped pressure block 312 arranged symmetrically to form a first channel gap 313. The upper L-shaped pressure block 311 and the lower L-shaped pressure block 312 are slidably connected to the thickness and width control frame 310 through sliding elongated holes 314 on the thickness and width control frame 310, and are respectively connected to the thickness and width control frame 310 through... The thickness drive component 315 on the thickness control frame 310 performs reciprocating drive in the thickness direction; the width control mechanism includes a left L-shaped pressure block 316 and a right L-shaped pressure block 317 arranged symmetrically to form a second channel gap 318. The second channel gap 318 is arranged in a front-to-back correspondence with the first channel gap 313. The left L-shaped pressure block 316 and the right L-shaped pressure block 317 are guided and slid left and right by a guide rod 319 and a guide hole 320, and are reciprocated by a width drive component 321 connected to the thickness and width control frame 310; the width drive component 321 and the thickness drive component 315 are cylinders or hydraulic cylinders.

[0046] 3. Angle adjustment unit The angle adjustment unit 4 includes a rotary support frame 410, a rotary drive motor 420, a rotary disk 430, and a manual worm gear 440. The rotary drive motor 420 is installed inside the rotary support frame 410 and drives the rotary disk 430 at the lower end of the rotary support frame 410 to rotate. The rotary disk 430 is connected to the continuous fiber impregnation device 2. The manual worm gear 440 is connected to the upper end of the rotary support frame 410 to realize manual and electric adjustment. That is, the rotary support frame 410 is fixedly supported in the height direction by an external support device.

[0047] 4. Integrated temperature control module Set sequentially along the advancing direction of the continuous winding central axis: The medium-temperature trimming zone 5-2 and the low-temperature shaping zone 5-3 adopt a step-by-step cooling structure, specifically, at least two independent cooling zones are set along the pipeline travel direction. The high-temperature bonding zone 5-1 is equipped with a high-temperature bonding heating device 510 and a temperature detection and control device 511. The medium-temperature trimming zone 5-2 is equipped with a medium-temperature trimming spray cooling device 520. The low-temperature shaping zone 5-3 is equipped with a low-temperature shaping upper spray cooling device 530 and a low-temperature shaping lower spray cooling device 531. The cooling devices are uniformly arranged atomizing nozzles. High-temperature bonding zone 5-1: 1.5m in length, temperature set at 250℃, heated by an electric heating tube to keep the fiber tape in a completely molten state at the beginning of winding; Medium-temperature finishing zone 5-2: 1.2m in length, with the temperature set at 180℃. The temperature is regulated by a spray cooling structure on the top of the semi-enclosed protective chamber to achieve initial bonding between layers, while also providing a suitable temperature for surface finishing. Low-temperature setting zone 5-3: 2.0m in length, temperature set at 100℃, temperature is adjusted by spray cooling structures arranged at the top and bottom to complete the initial curing.

[0048] The overall temperature gradient is 15℃ / cm. A PID controller is used to independently control the temperature of each area, and the temperature fluctuation is controlled within ±3℃.

[0049] 5. Surface treatment unit The surface treatment unit 6 is located in the rear section of the medium-temperature trimming zone 5-2. The semi-enclosed protective chamber 6-1 includes a main protective chamber structure 610 and an observation window 611. The main protective chamber structure 610 has open structures on both sides to provide a feeding channel for the continuous winding central shaft 1. The surface treatment pressure roller device 6-2 includes a tapered pressure roller 620, an electric push rod 621, and a pressure roller frame 623. The tapered pressure roller 620 is mounted on a tapered rod 622, which is inclined. The electric push rod 621 is fixed to the pressure roller frame 623, and its movable end abuts against the tapered pressure roller 620. The tapered pressure roller 620 is attached to the continuous winding central shaft 1.

[0050] Tapered pressure roller (620) of surface treatment pressure roller device: the taper angle at the inlet end is set to 15°, and the length of the tapered section is 80mm; the diameter of the cylindrical section at the rear end is 150mm, the length is 200mm, and the surface is coated with Teflon coating (capable of withstanding high temperature of 300℃).

[0051] 6. Cooling zone (integrated into the integrated temperature control module) Two independent cooling zones were set up along the direction of the pipes: First cooling zone: 1.2m in length, located on the upper part of the outer side of the semi-enclosed protective chamber and the rear section of the high-temperature bonding area and the medium-temperature trimming area, it cools down step by step through spraying, with a target temperature of 130℃; The second cooling zone, 2.0m in length, is located above and below the low-temperature shaping zone. It cools down gradually through spraying, with a target temperature of 80℃.

[0052] The water used for spray cooling is deionized water at a temperature of 25°C.

[0053] II. Operating Method The specific steps for producing DN300 glass fiber reinforced polypropylene spiral pipe using the above equipment are as follows: S1, Fiber spreading and preheating A continuous glass fiber yarn of 2400 tex is introduced into the fiber introduction and unfolding preheating module 210. Under the lateral thrust of the first arc-shaped dispersing roller 210-1 and the second arc-shaped dispersing roller 210-2, the fiber bundle is unfolded into a flat fiber strip with a width of 100 mm. The electric heating preheating device heats the fiber strip to 120°C.

[0054] S2, First-stage casting and impregnation The fiber belt enters the impregnation module 212, while the first-stage injection module uniformly injects 220°C polypropylene melt into the impregnation chamber (211-10) through the fan-shaped dispersion device 211-10 and the arc-shaped dispersion baffle 211-11. The fiber belt travels between the trapezoidal convex teeth and the groove structure 212-4, undergoing a pressure pulsation process of "compression-decompression-recompression", allowing the polypropylene melt to fully penetrate into the core of the fiber bundle.

[0055] S3, fiber layering and second-stage injection The initially impregnated fiber strip enters the fiber layer overlapping reinforcement module 213, where it is stretched and expanded within the gradient shrinkage cavity body 213-2, reopening the gaps between the fiber filaments. The first-stage yarn separating unit 213-10 divides the fiber bundle into multiple sub-bundles, which are then injected with 245°C high-temperature polypropylene melt (15°C higher than the cavity temperature) through the second-stage injection module 214 in the middle section of the cavity, re-impregnating the core of the fiber bundle. After being further dispersed by the second-stage yarn separating unit 213-11, the third-stage yarn separating unit 213-12 completes the final layered combination, forming a uniform fiber / resin mixed belt.

[0056] S4, Thickness setting with scraper The scraper trimming module 215 precisely controls the thickness of the fiber tape to 2.5mm and the width to a stable 100mm, resulting in a smooth surface without dry spots.

[0057] S5, Real-time adjustment of thickness and width The thickness and width of the continuous fiber tape are adjusted in real time by the thickness and width control unit 3.

[0058] S6, Angle Adjustment and Circumferential Winding The first angle adjustment unit adjusts the angle of the first continuous fiber impregnation device to 85°, and the second angle adjustment unit adjusts the angle of the second continuous fiber impregnation device to 85°. The two impregnation devices synchronously feed molten fiber strips (temperature 250°C) from the upper and lower sides of the continuous winding central shaft at a winding angle of 85°, respectively. The fibers are wound onto the surface of the central shaft in a circumferential staggered manner, with an overlap width of not less than 10mm, and adjacent turns are staggered by 3mm in the width direction. The rotational speed of the central shaft is 30rpm, and the axial advance speed is 0.5m / min.

[0059] S7, Temperature Gradient Curing The pipe wound around the central axis sequentially passes through a high-temperature bonding zone 5-1 (250℃), a medium-temperature trimming zone 5-2 (180℃), and a low-temperature setting zone 5-3 (100℃). In the high-temperature bonding zone 5-1, the fiber tape remains completely molten, and the interlayer molecular chains diffuse into each other to form a strong bond. In the medium-temperature trimming zone 5-2, polypropylene begins to crystallize, and the interlayer shear strength gradually builds up. In the low-temperature setting zone 5-3, the pipe is initially solidified and shaped. The rate of change of the temperature gradient is linked to the heating power.

[0060] S8, Surface Finishing The pipeline enters a semi-enclosed protective chamber to prevent dust contamination. The surface treatment roller device 6-2 performs elastic finishing when the pipeline surface temperature is approximately 170℃: the tapered inlet guides the pipeline smoothly into the chamber, while the cylindrical rear end rolls the surface to remove burrs and minor unevenness. An anti-stick coating prevents polypropylene residue from remaining on the roller. After finishing, the pipeline surface roughness is significantly reduced.

[0061] S9, zoned water mist cooling in stages The repaired pipes sequentially enter the first cooling zone (water mist cooling to 130℃) and the second cooling zone (water mist cooling to 80℃), and finally cool naturally to room temperature (below 50℃). The pipes are completely cured and formed, without any internal stress or warping deformation.

[0062] As can be seen from the above embodiments, the apparatus and method provided by the present invention can achieve efficient, continuous, and green production of thermoplastic composite pipes, possessing significant technical advantages and promising market application prospects. The embodiments mentioned above are merely preferred embodiments of the present invention and do not constitute a limitation on the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0063] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A continuously wound thermoplastic composite pipe production apparatus, characterized in that: It includes a continuous winding center shaft (1), a continuous fiber impregnation device (2), a thickness and width control unit (3), an angle adjustment unit (4), an integrated temperature adjustment module (5), and a surface treatment unit (6). Continuous winding center shaft (1): used to provide base support for pipe forming; driven by a drive component to rotate and advance along the axial direction; Continuous fiber impregnation device (2): disposed on at least one side of the continuous winding central shaft (1), for online compounding of thermoplastic resin and continuous fiber to form a continuous fiber strip in a molten state; Thickness and width control unit (3): connected to the outlet end of the continuous fiber impregnation device (2) to adjust the thickness and width of the continuous fiber belt in real time; Angle adjustment unit (4): connected between the continuous fiber impregnation device (2) and the continuous winding center shaft (1), used to adjust the relative angle between the continuous fiber impregnation device (2) and the continuous winding center shaft (1); Temperature integrated regulation module (5): arranged along the advancing direction of the continuous winding center axis (1), including a high temperature bonding area (5-1), a medium temperature trimming area (5-2) and a low temperature shaping area (5-3), used to realize integrated temperature management from high temperature winding to gradual cooling and curing; Surface treatment unit (6): Located at the rear end of the continuous winding center shaft (1), including a semi-enclosed protective chamber (6-1) at the rear end of the travel process and a surface treatment pressure roller device (6-2) at the front end, used to trim the surface of the pipe after winding.

2. The continuously wound thermoplastic composite pipe production apparatus according to claim 1, characterized in that: The continuous winding center shaft (1) is provided with continuous fiber impregnation devices (2) on both sides, which are respectively called the first continuous fiber impregnation device (2-1) and the second continuous fiber impregnation device (2-2); the thickness and width control unit (3) includes the first thickness and width control unit (3-1) and the second thickness and width control unit (3-2); the angle adjustment unit (4) includes the first angle adjustment unit (4-1) and the second angle adjustment unit (4-2); the first thickness and width control unit (3-1) and the second thickness and width control unit (3-2), as well as the first angle adjustment unit (4-1) and the second angle adjustment unit (4-2), are respectively provided with corresponding configurations to the first continuous fiber impregnation device (2-1) and the second continuous fiber impregnation device (2-2).

3. The continuously wound thermoplastic composite pipe production apparatus according to claim 1, characterized in that: The continuous fiber impregnation device (2) includes a fiber introduction and unfolding preheating module (210), a first-stage injection module (211), an impregnation module (212), a fiber layer superposition reinforcement module (213), a second-stage injection module (214), and a scraper trimming module (215) arranged sequentially along the fiber travel direction. Fiber introduction and unfolding preheating module (210): The fiber introduction and unfolding preheating module (210) includes an arc-shaped interlaced fiber dispersion device and an electric heating preheating device (210-3) pre-set at the inlet end; the arc-shaped interlaced fiber dispersion device includes two first arc-shaped dispersion rollers (210-1) and second arc-shaped dispersion rollers (210-2) arranged in a staggered manner along the fiber travel direction, and the roller surfaces of the first arc-shaped dispersion rollers (210-1) and the second arc-shaped dispersion rollers (210-2) are provided with arc-shaped protrusions in the middle; First-stage injection module (211): includes injection device (211-1); the injection device (211-1) is connected to the screw extrusion injection machine through a connecting pipe. The injection connection port (211-12) of the injection device (211-1) is located at the bottom. The injection device (211-1) has a fan-shaped dispersion cavity (211-10). The fan-shaped dispersion cavity (211-10) is a fan-shaped dispersion structure with a fan angle of 60~120°. The injection connection port (211-12) is connected to the fan-shaped dispersion cavity (211-10). It diffuses in a fan shape from the injection connection port (211-12) at the bottom to the top. An arc-shaped baffle (211-11) is provided at the top of the fan-shaped diffusion area. Resin channels are evenly distributed on the arc-shaped baffle (211-11) along the fan-shaped angle direction. Impregnation module (212): includes an upper mold (212-1), a lower mold (212-2), and an intermediate flow channel structure (212-3). The upper mold (212-1) and the lower mold (212-2) are alternately provided with triangular or trapezoidal protrusions and groove structures (212-4) along the fiber travel direction. The top of the protrusion is a rounded transition structure, and the groove between adjacent protrusions forms a local pressure reduction zone. When the fiber bundle passes through the protrusion, it is radially compressed. After entering the groove, the pressure drops sharply, forming a pressure pulsation process of "compression-decompression-recompression". Fiber layered overlapping reinforcement module (213): includes a multi-level yarn splitting module (213-1) and a gradient shrinkage cavity body (213-2); the multi-level yarn splitting module (213-1) is divided into three levels of yarn splitting units, namely a first-level yarn splitting unit (213-10), a second-level yarn splitting unit (213-11), and a third-level yarn splitting unit (213-12), which are respectively located at the beginning, middle section, and end of the gradient shrinkage cavity body (213-2); the gradient shrinkage... The cavity body (213-2) includes a macroscopic cavity outline and a microscopic texture on the cavity surface. The macroscopic cavity outline has a height-gradiently varying boss structure along the fiber travel direction. The height of the cavity inlet end (213-20) is greater than the height of the cavity outlet end (213-21), and the height in the middle is greater than the height on both sides. The gradient shrinkage cavity body (213-2) is provided with a dispersing injection port (213-22). The microscopic texture on the cavity surface consists of multiple uniformly arranged arc-shaped grooves distributed in the transverse direction. The second-stage injection module (214) is located between the first-stage yarn splitting unit (213-10) and the second-stage yarn splitting unit (213-11), and includes an independent heating jacket (214-1), a temperature sensor (214-2), a second-stage injection main structure (214-3), and a second-stage discharge port (214-4). Scraper trimming module (215): Located at the cavity outlet end (213-21), used to smooth the surface of the impregnated fiber tape.

4. The apparatus for producing continuously wound thermoplastic composite pipes according to claim 1, characterized in that: The thickness and width control unit (3) is located at the outlet end of the continuous fiber impregnation device (2), and includes a thickness and width control frame (310) and a thickness control mechanism and a width control mechanism arranged front and rear within the thickness and width control frame (310). The thickness control mechanism includes an upper L-shaped pressure block (311) and a lower L-shaped pressure block (312) arranged symmetrically to form a first channel gap (313). The upper L-shaped pressure block (311) and the lower L-shaped pressure block (312) are slidably connected to the thickness and width control frame (310) through sliding elongated holes (314) on the thickness and width control frame (310), and are respectively connected to the thickness and width control frame (310). The thickness drive component (315) on the thickness control frame (310) performs reciprocating drive in the thickness direction; the width control mechanism includes a left L-shaped pressure block (316) and a right L-shaped pressure block (317) arranged symmetrically at the center to form a second channel gap (318), the second channel gap (318) and the first channel gap (313) are arranged correspondingly front and back, the left L-shaped pressure block (316) and the right L-shaped pressure block (317) are guided and slid left and right by a guide rod (319) and a guide hole (320), and are reciprocated by a width drive component (321) connected to the thickness and width control frame (310); the width drive component (321) and the thickness drive component (315) are cylinders or hydraulic cylinders; The thickness lifting control device (312) drives the upper pressure roller (310) and / or the lower pressure roller (311) to perform longitudinal displacement; the thickness lifting control device (312) is a servo motor driven screw mechanism to realize closed-loop adjustment of the pressure roller gap, with an adjustment accuracy of ±0.05mm; the thickness lifting control device (312) is also provided with a width adjustment mechanism (313) for simultaneously adjusting the width distribution of the fiber belt.

5. The apparatus for producing continuously wound thermoplastic composite pipes according to claim 1, characterized in that: The angle adjustment unit (4) includes a rotary support frame (410), a rotary drive motor (420), a rotary disk (430), and a manual worm gear (440). The rotary drive motor (420) is located inside the rotary support frame (410) and drives the rotary disk (430) at the lower end of the rotary support frame (410) to rotate. The rotary disk (430) is connected to the continuous fiber impregnation device (2). The manual worm gear (440) is connected to the upper end of the rotary support frame (410) to realize manual and electric adjustment.

6. The apparatus for producing continuously wound thermoplastic composite pipes according to claim 1, characterized in that: The medium-temperature trimming zone (5-2) and the low-temperature shaping zone (5-3) adopt a step-down cooling structure, specifically, at least two independent cooling zones are set along the pipeline travel direction. The high-temperature bonding zone (5-1) is equipped with a high-temperature bonding heating device (510) and a temperature detection and control device (511). The medium-temperature trimming zone (5-2) is equipped with a medium-temperature trimming spray cooling device (520). The low-temperature shaping zone (5-3) is equipped with a low-temperature shaping upper spray cooling device (530) and a low-temperature shaping lower spray cooling device (531).

7. The apparatus for producing continuously wound thermoplastic composite pipes according to claim 1, characterized in that: The surface treatment unit (6) is located in the rear section of the medium-temperature trimming zone (5-2). The semi-enclosed protective chamber (6-1) includes a main protective chamber structure (610) and an observation window (611). The main protective chamber structure (610) has open structures on both sides to provide a feeding channel for the continuous winding center shaft (1). The surface treatment pressure roller device (6-2) includes a tapered pressure roller (620), an electric push rod (621), and a pressure roller frame (623). The tapered pressure roller (620) is set on a tapered rod (622). The tapered rod (622) is inclined. The electric push rod (621) is fixed to the pressure roller frame (623), and its movable end abuts against the tapered pressure roller (620). The tapered pressure roller (620) is attached to the continuous winding center shaft (1).

8. An operation method for a continuously wound thermoplastic composite pipe production apparatus, characterized in that, Includes the following steps: S1. The continuous fiber is combined with the thermoplastic resin online through the continuous fiber impregnation device (2) to form a continuous fiber belt in a molten state, and the outlet temperature is not lower than 200℃. S2. The thickness and width of the continuous fiber strip are adjusted in real time by the thickness and width control unit (3); S3. Adjust the continuous fiber impregnation device to the preset winding angle through the angle adjustment unit (4) so ​​that the molten continuous fiber strip is continuously wound to the surface of the continuous winding center shaft in a circumferential interlocking manner. S4. The temperature management module (5) is used to implement integrated temperature management of the pipeline during the winding process, so that the pipeline passes through the high temperature bonding zone (5-1), the medium temperature trimming zone (5-2) and the low temperature shaping zone (5-3) in sequence. The medium temperature trimming zone (5-2) and the low temperature shaping zone (5-3) adopt a segmented water mist cooling method, so that the pipeline can directly complete bonding, curing and cooling during the winding process. S5. The pipe after temperature gradient curing is introduced into the semi-enclosed protective chamber (6-1) of the surface treatment unit (6). The surface of the pipe is elastically trimmed by the surface treatment pressure roller device (6-2) so that the pipe temperature drops to ≤50℃ and the final curing is completed.

9. The operating method of the continuously wound thermoplastic composite pipe production device according to claim 8, characterized in that: In step S3, the overlap width of the circumferential staggered overlap is 5~10mm, and the fiber tapes between adjacent loops are staggered in the width direction; in step S4, the temperature of the high-temperature bonding zone (5-1) is 200~300℃, the temperature of the medium-temperature trimming zone (5-2) is 150~200℃, the temperature of the low-temperature setting zone (5-3) is 50~150℃, and the temperature gradient is 5~30℃ / cm; the cooling rate of the segmented water mist cooling stepwise is 20~50℃ / min.

10. The operating method of the continuously wound thermoplastic composite pipe production device according to claim 8, characterized in that: In step S5, when the surface treatment roller device (6-2) trims the pipe surface, the pipe surface temperature is 150~200℃; after trimming, the pipe surface roughness Ra is reduced to 1.6~3.2μm.

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