Continuous closed stirrup bending device and bending method for fiber reinforced thermoplastic resin composite material rib

Abstract

The invention provides a continuous closed stirrup bending device and method for a fiber reinforced thermoplastic resin composite material rib, and belongs to the field of stirrup bending devices. The problems that an existing device suitable for rapid bending on an engineering site is lacked in the aspects of preparation and performance of the continuous closed stirrup made of the fiber reinforced thermoplastic resin composite material, and other stirrup bending devices are insufficient in heating precision, low in bending efficiency, limited in product size, incapable of meeting rapid bending on the engineering site and the like are solved. Three straight rib section straight plates and two bent section fan-shaped plates alternately form a U shape and are fixed on a U rib section bottom plate, a connecting section straight plate, two bent section fan-shaped plates and two straight rib section straight plates alternately form a U shape and are fixed on a continuous section bottom plate, and two U shapes are oppositely arranged. By changing the sizes of the bottom plate, the straight plate and the baffle plate, the continuous closed stirrup processing device is suitable for processing continuous closed stirrups made of fiber reinforced thermoplastic resin composite materials with different materials, diameters and bending radiuses, and is wide in applicability.

Description

Technical Field

[0001] This invention belongs to the field of stirrup bending devices, and in particular relates to a continuous closed stirrup bending device and bending method for fiber-reinforced thermoplastic resin composite reinforcement. Background Technology

[0002] FRP stirrups (fiber-reinforced resin matrix composite stirrups, mainly GFRP / CFRP) effectively solve the problem of concrete spalling caused by steel stirrup corrosion due to their high corrosion resistance, making them particularly suitable for chloride-contaminated environments (such as marine engineering and de-icing salt bridges). Their lightweight properties significantly reduce transportation and installation costs and improve construction efficiency, with tensile strength reaching 800-1600 MPa. Engineering case studies show that GFRP stirrups reinforce cement-based composite columns improve lateral impact resistance by 35%, increase residual bearing capacity by 43%, and significantly enhance structural toughness. Furthermore, their insulation properties prevent electromagnetic interference, making them suitable for specialized facilities (such as medical buildings and laboratories).

[0003] The core advantage of thermoplastic resins (such as polypropylene and acrylic acid) lies in their reversible physical phase change characteristics: softening upon heating (above Tg) - plastic flow - hardening upon cooling - strength recovery, supporting multiple reshaping and recycling. In contrast, thermosetting resins are not recyclable due to their three-dimensional cross-linked network, resulting in tens of thousands of tons of waste annually. Thermoplastic resins have a much higher elongation at break than thermosetting resins, making them more adaptable to bending processes. In terms of humid heat resistance, they have extremely low water absorption and better interfacial stability in humid heat environments compared to thermosetting resins.

[0004] Compared to steel stirrups, thermoplastic stirrups offer breakthroughs in durability: they completely isolate moisture and corrosive media, reducing maintenance costs throughout their life cycle; they are lightweight, with a density only 1 / 4 that of steel reinforcement, allowing for rapid on-site bending; they optimize seismic resistance and energy consumption, with an elastic modulus close to that of concrete, matching thermal expansion coefficients, and high damping characteristics that enhance the structure's seismic resistance; and they offer superior economic benefits throughout the entire life cycle: extending structural life and reducing overall costs.

[0005] Currently, there is a lack of suitable devices for rapid bending of fiber-reinforced thermoplastic composite continuous closed stirrups in both domestic and international applications, particularly regarding their fabrication and performance. Other stirrup bending devices suffer from insufficient heating precision, low bending efficiency, limited product dimensions, and inability to meet the demands of rapid bending in engineering settings. Therefore, there is a need to develop a bending device for fiber-reinforced thermoplastic composite continuous closed stirrups that can produce such stirrups with high precision and efficiency, while also meeting the requirements for rapid bending in engineering settings. Summary of the Invention

[0006] In view of this, in order to solve the problem that existing devices for the preparation and performance of continuous closed stirrups made of fiber-reinforced thermoplastic resin composites lack suitable for rapid bending on the engineering site, and that other stirrup bending devices have problems such as insufficient heating accuracy, low bending efficiency, limited product size, and inability to meet the requirements of rapid bending on the engineering site, this invention proposes a continuous closed stirrup bending device and bending method for fiber-reinforced thermoplastic resin composite reinforcement.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a continuous closed stirrup bending device for fiber-reinforced thermoplastic resin composite reinforcement, comprising a continuous section base plate, a U-shaped reinforcement section base plate, four bending section fan-shaped plates, five straight reinforcement section straight plates, a connecting section straight plate, and several baffles. The three straight reinforcement section straight plates and the two bending section fan-shaped plates alternately form a U-shape and are fixed on the U-shaped reinforcement section base plate. The connecting section straight plate, the two bending section fan-shaped plates, and the two straight reinforcement section straight plates alternately form a U-shape and are fixed on the continuous section base plate. The two U-shapes are arranged opposite to each other. Furthermore, the bent section fan-shaped plate, the straight rib section straight plate, and the connecting section straight plate are fixed to the continuous section bottom plate or the U-rib section bottom plate by means of pins.

[0008] Furthermore, all five straight rib sections are rectangular.

[0009] Furthermore, long baffles are fixed to the outer sides of the two opposing straight rib sections.

[0010] Furthermore, short baffles are fixed to the outer side of the straight plates of the other three straight rib sections.

[0011] Furthermore, the connecting section includes a rectangular body and an arc-shaped section, with the arc-shaped section connected to the side of the rectangular body to form an internal groove.

[0012] Furthermore, casters are installed at the bottom of the continuous section bottom plate and the U-rib section bottom plate.

[0013] An assembly method for a continuous closed stirrup bending device for fiber-reinforced thermoplastic resin composite bars specifically includes the following steps: Step 1: First, select the corresponding size continuous section base plate, U-rib section base plate, bent section fan-shaped plate, straight rib section straight plate and connecting section straight plate according to the needs. Align the round holes of the bent section fan-shaped plate, straight rib section straight plate and connecting section straight plate with the round holes on the continuous section base plate and U-rib section base plate respectively, and fix them with pins. Step 2: Determine the length of the straight bar segments on both sides of the continuous closed stirrup, calculate the distance between the bottom plate of the continuous section and the bottom plate of the U-bar segment, install six sets of casters at the bottom of the bottom plate of the continuous section and the bottom plate of the U-bar segment, move the casters to adjust the bottom plate of the continuous section and the bottom plate of the U-bar segment to correspond and the distance is the calculated value; Step 3: Lock the casters to stabilize the device. Select the short and long baffles of the corresponding sizes and ensure that they can be fitted into the corresponding pins. Finally, remove the short and long baffles. After confirming that all dimensions of the device are correct, complete the assembly of the continuous closed stirrup bending device.

[0014] A method for bending stirrups using the aforementioned continuous closed stirrup bending device for fiber-reinforced thermoplastic resin composite reinforcement specifically includes the following steps: First, heat the oven and place the fiber-reinforced thermoplastic resin composite straight ribs into the oven for heating. Then, place the composite straight ribs into the groove inside the connecting section straight plate and bend them around the connecting section straight plate, the bending section fan-shaped plate, and the straight rib section straight plate on the bottom plate of the continuous section. Insert the short baffle into the pin on the straight rib section straight plate to restrict the position of the ribs. The remaining straight bars are bent again around the bent section fan-shaped plate and the straight bar section straight plate on the bottom plate of the U-bar segment. Two short baffles and one long baffle are respectively inserted into the corresponding pins to restrict the already formed stirrup part. Finally, the straight reinforcement is formed by shaping the arc-shaped mold around the outside of the straight plate of the connecting section, and a short baffle and a long baffle are inserted to form a complete continuous stirrup. After the reinforcement material has completely cooled, the baffles are removed to obtain a fiber-reinforced thermoplastic resin composite continuous closed stirrup.

[0015] Compared with the prior art, the beneficial effects of the continuous closed stirrup bending device and bending method for fiber-reinforced thermoplastic resin composite reinforcement described in this invention are: 1. The continuous closed stirrup bending device of the present invention has a simple, modular structure and is easy to operate. By winding the composite material reinforcement around the main body of the device, the continuous closed stirrup of fiber-reinforced thermoplastic resin composite material is formed. At the same time, the heating and bending processes are separated, which significantly improves the preparation efficiency. The prepared continuous closed stirrups have uniform specifications, support assembly line operation, and have excellent production efficiency.

[0016] 2. This invention can be adapted to the processing of continuous closed stirrups made of fiber-reinforced thermoplastic resin composite materials with different materials, diameters and bending radii by changing the size of the base plate, straight plate and baffle, and has wide applicability. Attached Figure Description

[0017] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a three-dimensional schematic diagram of a continuous closed stirrup device provided by the present invention; Figure 2 This is a front view of a continuous closed stirrup device provided by the present invention; Figure 3 This is a side view of a continuous closed stirrup device provided by the present invention; Figure 4 This is a top view of a continuous closed stirrup device provided by the present invention; Figure 5 This is a three-dimensional schematic diagram of the continuous segment bottom plate and the U-rib segment bottom plate provided by the present invention; Figure 6 This is a three-dimensional schematic diagram of the bent sector plate and the straight plate with straight ribs provided by the present invention; Figure 7 This is a three-dimensional schematic diagram of the straight connecting section plate provided by the present invention; Figure 8 This is a three-dimensional schematic diagram of the latch provided by the present invention; Figure 9 This is a three-dimensional schematic diagram of the short baffle provided by the present invention; Figure 10 This is a three-dimensional schematic diagram of the universal wheel provided by the present invention; Explanation of reference numerals in the attached drawings: 1-Continuous bottom plate; 2-U-shaped bottom plate; 3-Bent section fan-shaped plate; 4-Straight plate of straight reinforcement section; 5-Straight plate of connecting section; 6-Pin; 7-Short baffle; 8-Long baffle; 9-Universal wheel; 10-Continuous closed stirrup. Detailed Implementation

[0018] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the drawings, and not all of them. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the invention.

[0019] See Figure 1-10 This embodiment describes a continuous closed stirrup bending device for fiber-reinforced thermoplastic resin composite reinforcement, comprising a continuous section base plate 1, a U-shaped reinforcement section base plate 2, four bending section fan-shaped plates 3, five straight reinforcement section straight plates 4, a connecting section straight plate 5, and several baffles. The three straight reinforcement section straight plates 4 and the two bending section fan-shaped plates 3 alternately form a U-shape and are fixed on the U-shaped reinforcement section base plate 2. The connecting section straight plate 5, the two bending section fan-shaped plates 3, and the two straight reinforcement section straight plates 4 alternately form a U-shape and are fixed on the continuous section base plate 1. The two U-shapes are arranged opposite to each other.

[0020] The continuous section base plate 1 and the U-shaped section base plate 2 are provided with multiple through holes. The bent section fan-shaped plate 3, the straight section straight plate 4, and the connecting section straight plate 5 can be fixed to the base plate by the pin 6. The position of the through holes on the base plate is determined, and the entire base plate can be directly replaced for stirrups of different sizes.

[0021] The bent sector plate 3, the straight bar plate 4, and the connecting straight bar plate 5 can be used to shape the straight bars of the continuous closed stirrup 10, and their through holes can be used for fixing; the connecting straight bar plate 5 extends outward with a sector-shaped bent section and a straight section, which can be used to prepare the closed section of the continuous closed stirrup 10. For different requirements of the closed section, the connecting straight bar plate 5 of different sizes can be directly replaced.

[0022] Below the short baffle 7 and the long baffle 8 there is a sleeve that fits the top of the pin 6, which can be directly inserted into the pin 6 to achieve the combination with the overall device. The extended baffle can be used to constrain the formed continuous closed stirrup 10 until it cools and hardens. The distance between the baffle and the straight plate is equal to the diameter of the continuous closed stirrup 10 to ensure a tight fit and standardize the prepared continuous closed stirrup 10.

[0023] The continuous section base plate 1, U-rib section base plate 2, bent section fan-shaped plate 3, straight rib section straight plate 4, connecting section straight plate 5, short baffle 7, and long baffle 8 are all provided with different sizes, which can be matched and replaced according to the size requirements of the bent rib. The modular design makes it easy to operate and highly adaptable.

[0024] The caster wheel 9 can move in multiple directions and can be installed at the bottom of the continuous section base plate 1 and the U-rib section base plate 2 to drive the entire device to move. At the same time, the caster wheel 9 is equipped with a locking device to lock the wheel rolling and the bracket rotation.

[0025] The continuous closed stirrup 10 is an integrated, continuously molded fiber-reinforced thermoplastic resin composite ring structure. The whole is a rounded rectangle with rounded corners and pre-reserved anchor ends on the short side, which makes full use of the continuous plasticity of thermoplastic materials and takes into account both structural stability and ease of assembly. The assembly process of the continuous closed stirrup bending device for fiber-reinforced thermoplastic resin composite reinforcement of the present invention is as follows: Step 1: First, select the corresponding sizes of continuous section base plate 1, U-rib section base plate 2, bent section fan-shaped plate 3, straight section straight plate 4, and connecting section straight plate 5 as needed. Align the round holes of bent section fan plate 3, straight section straight plate 4, and connecting section straight plate 5 with the round holes on continuous section base plate 1 and U-rib section base plate 2, respectively, and fix them with pins 6. Step 2: Determine the length of the straight bar segments on both sides of the continuous closed stirrup 10, calculate the distance between the bottom plate 1 of the continuous section and the bottom plate 2 of the U-bar segment, install six sets of casters 9 at the bottom of the bottom plate 1 of the continuous section and the bottom plate 2 of the U-bar segment, move the casters 9, adjust the bottom plate 1 of the continuous section and the bottom plate 2 of the U-bar segment to correspond and the distance is the calculated value; Step 3: Lock the casters 9 to stabilize the device. Select the short baffle 7 and long baffle 8 of the corresponding size and ensure that they can be fitted into the corresponding pins 6. Finally, remove the short baffle 7 and long baffle 8. After confirming that the dimensions of the device are correct, complete the assembly of the continuous closed stirrup bending device.

[0026] The specific production process of fiber-reinforced thermoplastic resin composite continuous closed stirrups is as follows: Step 1: First, heat the oven to the softening temperature of the thermoplastic resin; place the fiber-reinforced thermoplastic resin composite straight ribs into the oven and heat for a period of time until they soften. Then, place the composite straight ribs into the inner groove of the connecting section straight plate 5, bend them around the connecting section straight plate 5, the bending section fan-shaped plate 3, and the straight rib section straight plate 4 on the continuous section bottom plate 1, and insert the short baffle 7 into the pin 6 on the straight rib section straight plate 4 to restrict the position of the ribs. Step 2: Bend the remaining straight bars around the bent fan-shaped plate 3 and the straight plate 4 of the straight bar section on the bottom plate 2 of the U-bar section again. Use two short baffles 7 and one long baffle 8 to fit into the corresponding pins 6 to restrict the formed stirrups. Step 3: Finally, the straight rib is formed by wrapping it around the arc-shaped mold on the outside of the straight plate 5 of the connecting section, and a short baffle 7 and a long baffle 8 are inserted to form a complete continuous stirrup 10. After the rib material has completely cooled, the baffles are removed to obtain the fiber-reinforced thermoplastic resin composite continuous closed stirrup 10.

[0027] Existing heating technologies mainly rely on localized hot air guns to heat the bending area, which lacks precision. In contrast, this invention uses a whole oven for overall heating and temperature control, resulting in more precise temperature control.

[0028] The continuous closed stirrup bending device for fiber-reinforced thermoplastic resin composite reinforcement described in this invention is based on the thermoplastic resin properties of the material: it can be shaped after being heated and softened, and recovers its strength after being cooled and hardened.

[0029] The method for bending using the continuous closed stirrup bending device for fiber-reinforced thermoplastic resin composite reinforcement described in this invention is as follows: After the fiber-reinforced thermoplastic resin composite bar is softened by heating in an oven, it is bent around a continuous closed stirrup bending device while a baffle is used to constrain the shape of the bar. After bending around the stirrup bending device for 5 / 4 turns, it is cooled and formed to obtain a continuous closed stirrup made of fiber-reinforced thermoplastic resin composite material.

[0030] The specific process is as follows: First, heat the oven and put the fiber-reinforced thermoplastic resin composite straight ribs into the oven for heating. Then, put the composite straight ribs into the inner groove of the connecting section straight plate 5 and bend them around the connecting section straight plate 5, the bending section fan-shaped plate 3, and the straight rib section straight plate 4 on the continuous section bottom plate 1. Insert the short baffle 7 into the pin 6 on the straight rib section straight plate to restrict the position of the ribs. The remaining straight bars are bent again around the bent section fan-shaped plate 3 and the straight plate 4 of the straight bar section on the bottom plate 2 of the U-bar section. Two short baffles 7 and one long baffle 8 are respectively inserted into the corresponding pins 6 to restrict the already formed stirrups. Finally, the straight rib is formed by shaping the arc-shaped mold around the outside of the straight plate 5 of the connecting section, and a short baffle 7 and a long baffle 8 are inserted to form a complete continuous stirrup. After the rib material has completely cooled, the baffles are removed to obtain the fiber-reinforced thermoplastic resin composite continuous closed stirrup 10.

[0031] Example 1 The specific implementation method is as follows: During the assembly stage of the continuous closed stirrup bending device, first select the following: a continuous section base plate 1 of 375mm×264mm, a U-shaped section base plate 2 of 375mm×242mm, a straight section plate 4 of 132mm×50mm, a bending section fan-shaped plate 3 with a radius of 84mm, and a connecting section straight plate 5 of 132mm×50mm with a groove of 12mm. Align the round holes of the bending section fan-shaped plate 3, the straight section plate 4, and the connecting section straight plate 5 with the round holes on the continuous section base plate 1 and the U-shaped section base plate 2, respectively, and fix them with pins 6. The length of the straight bar segments on both sides of the continuous closed stirrup 10 is determined to be 400mm. The distance between the bottom plate of the continuous section 1 and the bottom plate of the U-bar section 2 is calculated to be 145mm. Six sets of casters 9 are installed at the bottom of the bottom plate of the continuous section 1 and the bottom plate of the U-bar section 2. The casters 9 are moved to adjust the bottom plate of the continuous section 1 and the bottom plate of the U-bar section 2 to correspond and the distance is the calculated value. Lock the casters 9 to stabilize the device. Select the short baffle 7 (75mm long) and the long baffle 8 (97mm long) and ensure that they can be fitted into the corresponding pins 6. Finally, remove the short baffle 7 and the long baffle 8. After confirming that all dimensions of the device are correct, complete the assembly of the continuous closed stirrup bending device.

[0032] The production process of fiber-reinforced thermoplastic resin composite continuous closed stirrups is as follows: First, heat the oven to 200℃; place a 2.4m long and 12mm diameter fiber-reinforced thermoplastic resin composite straight rib into the oven and heat for 15 minutes. Then, place the composite straight rib into the inner groove of the connecting section straight plate 5 and bend it around the connecting section straight plate 5, the bending section fan-shaped plate 3, and the straight rib section straight plate 4 on the continuous section bottom plate 1. Insert the short baffle 7 into the pin 6 on the straight rib section straight plate to restrict the position of the rib. The remaining straight bars are bent again around the bent section fan-shaped plate 3 and the straight plate 4 of the straight bar section on the bottom plate 2 of the U-bar section. Two short baffles 7 and one long baffle 8 are respectively inserted into the corresponding pins 6 to restrict the already formed stirrups. Finally, the straight rib is formed by shaping the arc-shaped mold around the outside of the straight plate 5 of the connecting section, and a short baffle 7 and a long baffle 8 are inserted to form a complete continuous stirrup. After the rib material has completely cooled, the baffles are removed to obtain the fiber-reinforced thermoplastic resin composite continuous closed stirrup 10.

[0033] Example 2 During the assembly stage of the continuous closed stirrup device, first select the following: a continuous section base plate 1 of 375mm×264mm, a U-shaped section base plate 2 of 375mm×242mm, a straight section plate 4 of 110mm×50mm, a bent section fan-shaped plate 3 with a radius of 70mm, and a connecting section straight plate 5 of 110mm×50mm with a groove of 10mm. Align the round holes of the bent section fan-shaped plate 3, the straight section plate 4, and the connecting section straight plate 5 with the round holes on the continuous section base plate 1 and the U-shaped section base plate 2, respectively, and fix them with pins 6. The length of the straight bar segments on both sides of the continuous closed stirrup 10 is determined to be 340mm. The distance between the continuous section bottom plate 1 and the U-bar section bottom plate 2 is calculated to be 285mm. Six sets of casters 9 are installed at the bottom of the continuous section bottom plate 1 and the U-bar section bottom plate 2. The casters 9 are moved to adjust the continuous section bottom plate 1 and the U-bar section bottom plate 5 to correspond and the distance is the calculated value. Lock the casters 9 to stabilize the device. Select the short baffle 7 (75mm long) and the long baffle 8 (97mm long) and ensure that they can be fitted into the corresponding pins 6. Finally, remove the short baffle 7 and the long baffle 8. After confirming that all dimensions of the device are correct, complete the assembly of the continuous closed stirrup bending device.

[0034] The production process of fiber-reinforced thermoplastic resin composite continuous closed stirrups is as follows: First, heat the oven to 220℃; place a 2.2m long and 10mm diameter fiber-reinforced thermoplastic resin composite straight rib into the oven and heat for 10 minutes. Then, place the composite straight rib into the inner groove of the connecting section straight plate 5 and bend it around the connecting section straight plate 5, the bending section fan-shaped plate 3, and the straight rib section straight plate 4 on the continuous section bottom plate 1. Insert the short baffle 7 into the pin 6 on the straight rib section straight plate 4 to restrict the position of the rib. The remaining straight bars are bent again around the bent section fan-shaped plate 3 and the straight plate 4 of the straight bar section on the bottom plate 2 of the U-bar section. Two short baffles 7 and one long baffle 8 are respectively inserted into the corresponding pins 6 to restrict the already formed stirrups. Finally, the straight rib is formed by shaping the arc-shaped mold around the outside of the straight plate 5 of the connecting section, and a short baffle 7 and a long baffle 8 are inserted to form a complete continuous stirrup. After the rib material has completely cooled, the baffles are removed to obtain the fiber-reinforced thermoplastic resin composite continuous closed stirrup 10.

[0035] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating orientation and positional relationships are based on the orientation and positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0036] The embodiments of the present invention disclosed above are merely illustrative of the invention. These embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention.

Claims

1. A continuous closed stirrup bending device for fiber-reinforced thermoplastic resin composite reinforcement, characterized in that: It includes a continuous section base plate (1), a U-shaped section base plate (2), four bent section fan-shaped plates (3), five straight section straight plates (4), a connecting section straight plate (5), and several baffles. The three straight section straight plates (4) and the two bent section fan-shaped plates (3) alternately form a U-shape and are fixed on the U-shaped section base plate (2). The connecting section straight plate (5), the two bent section fan-shaped plates (3), and the two straight section straight plates (4) alternately form a U-shape and are fixed on the continuous section base plate (1). The two U-shapes are set opposite to each other.

2. The continuous closed stirrup bending device for fiber-reinforced thermoplastic resin composite reinforcement according to claim 1, characterized in that: The bent section fan-shaped plate (3), the straight rib section straight plate (4), and the connecting section straight plate (5) are fixed to the continuous section bottom plate (1) or the U-rib section bottom plate (2) by means of pins (6).

3. The continuous closed stirrup bending device for fiber-reinforced thermoplastic resin composite reinforcement according to claim 1, characterized in that: All five straight rib sections (4) are rectangular.

4. The continuous closed stirrup bending device for fiber-reinforced thermoplastic resin composite reinforcement according to claim 3, characterized in that: Two straight rib sections (4) facing each other are fixed with long baffles (8) on their outer sides.

5. The continuous closed stirrup bending device for fiber-reinforced thermoplastic resin composite reinforcement according to claim 3, characterized in that: The other three straight sections of the straight plate (4) are fixed with short baffles (7) on the outside.

6. The continuous closed stirrup bending device for fiber-reinforced thermoplastic resin composite reinforcement according to claim 1, characterized in that: The connecting section straight plate (5) includes a rectangular body and an arc-shaped section. The arc-shaped section is connected to the side of the rectangular body to form an internal groove.

7. The continuous closed stirrup bending device for fiber-reinforced thermoplastic resin composite reinforcement according to claim 1, characterized in that: The bottom of the continuous section bottom plate (1) and the U-rib section bottom plate (2) are equipped with casters (9).

8. An assembly method for a continuous closed stirrup bending device for fiber-reinforced thermoplastic resin composite reinforcement as described in any one of claims 1-7, characterized in that: Specifically, the following steps are included: Step 1: First, select the corresponding size continuous section base plate (1), U-rib section base plate (2), bent section fan-shaped plate (3), straight rib section straight plate (4) and connecting section straight plate (5) according to the needs. Then, align the round holes of the bent section fan-shaped plate (3), straight rib section straight plate (4) and connecting section straight plate (5) with the round holes on the continuous section base plate (1) and U-rib section base plate (2) respectively, and fix them with pins (6). Step 2: Determine the length of the straight bar segments on both sides of the continuous closed stirrup 10, calculate the distance between the bottom plate of the continuous section (1) and the bottom plate of the U-bar segment (2), install six sets of casters (9) at the bottom of the bottom plate of the continuous section (1) and the bottom plate of the U-bar segment (2), move the casters (9) to adjust the bottom plate of the continuous section (1) and the bottom plate of the U-bar segment (2) to correspond and the distance is the calculated value; Step 3: Lock the casters (9) to keep the device stable. Select the short baffle (7) and long baffle (8) of the corresponding size and ensure that they can be fitted into the corresponding pins (6). Finally, remove the short baffle (7) and long baffle (8). After confirming that the dimensions of the device are correct, complete the assembly of the continuous closed stirrup bending device.

9. A method for bending stirrups using the continuous closed stirrup bending device for fiber-reinforced thermoplastic composite reinforcement as described in any one of claims 1-7, characterized in that: Specifically, the following steps are included: First, heat the oven and put the fiber-reinforced thermoplastic resin composite straight rib into the oven for heating. Then, put the composite straight rib into the inner groove of the connecting section straight plate (5), bend it around the connecting section straight plate (5), the bending section fan-shaped plate (3), and the straight rib section straight plate (4) on the continuous section bottom plate (1), and put the short baffle (7) into the pin (6) on the straight rib section straight plate to restrict the position of the rib. The remaining straight bars are bent again around the bent section fan-shaped plate (3) and the straight plate (4) of the straight bar section on the bottom plate (2) of the U-bar section. Two short baffles (7) and one long baffle (8) are respectively inserted into the corresponding pins (6) to restrict the already formed stirrups. Finally, the straight bar is formed by bending the mold around the outside of the straight plate (5) of the connecting section, and a short baffle (7) and a long baffle (8) are inserted to form a complete continuous stirrup. After the bar material has completely cooled, the baffles are removed to obtain a continuous closed stirrup (10).

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