Thermoplastic FRP tendon handheld heating and bending device and method

Abstract

The application relates to the technical field of FRP rod processing, and discloses a handheld heating and bending device and method for thermoplastic FRP rods, which comprises a handheld component, an extension component and a forming component. A liquid storage assembly is arranged in the handheld component. The extension component comprises a plurality of first extension components arranged transversely at the end of the handheld component. The forming component is composed of a rigid heating ring, a flexible bag body and an extension positioning assembly. The flexible bag body is arranged in the rigid heating ring and adheres to the inner wall. The liquid storage assembly is in communication with the flexible bag body. The two ends of the extension positioning assembly are connected with the rigid heating ring and the flexible film respectively. The device is loaded with the first extension component which can be independently adjusted, and is matched with the hinged rigid heating ring and the flexible bag body with the built-in heat-conducting liquid, so that an integrated handheld bending structure which can flexibly adjust and control the bending parameters is constructed. The bending radius can be flexibly adjusted without disassembling and replacing the bending clamp, the thermoplastic FRP rod bending operation process is simplified, and the bending and forming efficiency on the construction site is improved.

Description

Technical Field

[0001] This invention relates to the field of FRP (fiberglass reinforced plastic) rebar processing technology, specifically to a handheld heating and bending device and method for thermoplastic FRP rebar. Background Technology

[0002] Thermoplastic fiber-reinforced polymer (FRP) bars possess advantages such as lightweight, high strength, corrosion resistance, and the ability to be bent and formed in two stages. They are now widely used in concrete structures such as bridges, marine engineering, and corrosion protection projects. In engineering applications, it is often necessary to perform multiple bending and forming processes at different angles on a single thermoplastic FRP bar according to the reinforcement requirements of the component.

[0003] Existing bending equipment generally adapts to different bending radii by changing bending fixtures, lacking a structural design that allows for flexible adjustment of the bending radius. This results in cumbersome and inconvenient bending processes, thereby reducing the efficiency of bending operations on construction sites.

[0004] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a handheld heating and bending device and method for thermoplastic FRP bars, which aims to solve the problem that existing thermoplastic FRP bar bending equipment requires changing multiple sets of clamps for different bending radii, resulting in cumbersome processing procedures and low bending efficiency.

[0006] The technical solution adopted by this invention to solve the technical problem is as follows: A handheld heating and bending device for thermoplastic FRP ribs, comprising: A handheld component, a telescopic component disposed on the handheld component, and a molding component disposed on the telescopic component; The handheld component is equipped with a liquid storage assembly; The telescopic component includes a plurality of first telescopic members laterally disposed at one end of the handheld component; The molding component includes multiple rigid heating rings, a flexible bladder, and multiple sets of telescopic positioning components. The multiple rigid heating rings are rotatably disposed at one end of multiple first telescopic components. The flexible bladder is disposed inside the multiple rigid heating rings and connected to the inner wall of the multiple rigid heating rings. The inner side of the flexible bladder is a flexible film. The interior of the flexible bladder is filled with a heat-conducting liquid. The liquid storage component is connected to the flexible bladder to fill or recycle the heat-conducting liquid inside the flexible bladder. The multiple sets of telescopic positioning components are disposed inside the flexible bladder, with one end of the telescopic positioning component disposed on the rigid heating ring and the other end disposed on the flexible film.

[0007] Furthermore, the handheld component includes a base, a handheld handle disposed on the base, an integrated control box disposed on the handheld handle, and a rotary connector disposed at the front end of the integrated control box; The integrated control box is equipped with a drive motor, the output shaft of which is coaxially connected to the rotary connector, and the telescopic component is mounted on the rotary connector.

[0008] Furthermore, the telescopic component also includes a base plate disposed on the rotary connector, and a groove is provided on the side of the base plate away from the rotary connector, and one end of the first telescopic component is slidably disposed in the groove.

[0009] Furthermore, the rigid heating ring includes an upper heating ring, a lower heating ring, a connecting member, and two driving members; The upper and lower heating rings are rotatably mounted on the connector via a rotating shaft. The upper and lower heating rings cooperate to form a cylindrical receiving cavity to accommodate the flexible capsule. The end of the connector away from the cylindrical receiving cavity is laterally rotatably connected to the first telescopic member. One end of each of the two driving members is hinged to the connector, and the other end is hinged to the upper and lower heating rings respectively, so as to drive the upper and lower heating rings to rotate around the rotating shaft.

[0010] Furthermore, the first telescopic member has a rotating groove at one end near the connector, and a ball groove is provided in the rotating groove. The connector has a ball rotating member at one end near the first telescopic member, and the ball rotating member is rotatably disposed in the ball groove. One end of the connector is slidably engaged with the rotating groove.

[0011] Furthermore, an opening is provided on one side of the flexible bladder, which corresponds to the closed portion of the upper half heating ring and the lower half heating ring, and opens and closes as the upper half heating ring and the lower half heating ring rotate.

[0012] Furthermore, the telescopic positioning assembly includes a plurality of small telescopic rods arranged radially on the inner wall of the rigid heating ring, and the protruding ends of the small telescopic rods are connected to the flexible film.

[0013] Furthermore, the flexible capsule includes multiple independent flexible cavities, which are arranged sequentially along the inner wall of the rigid heating ring, and are respectively connected to the liquid storage assembly through pipes.

[0014] Furthermore, the liquid storage assembly includes a liquid storage housing and a pump body disposed within the integrated control box; The liquid storage shell contains a heat-conducting liquid. The liquid storage shell is connected to the inlet of the pump body through a pipe, and the outlet of the pump body is connected to the flexible bladder through a pipe. The flexible bladder is connected to the liquid storage shell through a return pipe, and a switch valve is provided on the return pipe.

[0015] A method for hand-held heating and bending of thermoplastic FRP bars, based on the aforementioned hand-held heating and bending device for thermoplastic FRP bars, includes: The thermoplastic FRP bar to be processed is coaxially placed inside the clamping and bending cavity formed by the flexible bladder; Activate the multiple sets of telescopic positioning components to make the flexible film adhere to and clamp the outer wall of the thermoplastic FRP rib, thereby completing the coaxial centering and limiting of the thermoplastic FRP rib; The liquid storage assembly is activated, which quantitatively injects thermally conductive liquid into the flexible bladder and simultaneously activates each rigid heating ring. The rigid heating rings uniformly heat the thermally conductive liquid in the cavity, causing the thermoplastic FRP ribs to soften and deform to a bendable state. By displacing the first telescopic component differently through multiple horizontally arranged components, the corresponding rigid heating and surrounding connection end is deflected, and the flexible bladder is deformed synchronously, applying bending force to the softened thermoplastic FRP rib and bending the thermoplastic FRP rib to a preset bending angle. Stop the rigid heating ring from supplying heat, and wait for the heat-conducting liquid to circulate and dissipate heat, allowing the thermoplastic FRP rib to cool, solidify, and set, thus completing a single thermoplastic FRP rib heating and bending operation.

[0016] Compared with the prior art, the beneficial effects of the present invention are: In this invention, a handheld component is equipped with multiple independently adjustable first telescopic components, which are combined with multiple sets of rigid heating rings that are hinged accordingly. A flexible bladder filled with heat-conducting liquid and a telescopic positioning component are set inside the heating rings to construct an integrated handheld bending structure that can flexibly adjust bending parameters. This replaces the traditional processing method that relies on changing bending fixtures to adjust the bending radius. The bending radius can be flexibly adjusted without disassembling and changing tooling, simplifying the bending process of thermoplastic FRP bars and effectively improving the overall efficiency of bending operations on the construction site. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the handheld component structure of the present invention.

[0019] Figure 3 This is a schematic diagram of the first state structure of the thermoplastic FRP rib and flexible bladder of the present invention.

[0020] Figure 4This is a schematic diagram of the second state structure of the thermoplastic FRP rib and flexible bladder of the present invention.

[0021] Figure 5 This is a schematic diagram of the rigid heating ring and flexible capsule in the open state of the present invention.

[0022] Figure 6 This is a schematic diagram of the internal structure of the flexible capsule of the present invention.

[0023] Figure 7 This is a schematic diagram of the thermoplastic FRP reinforcement of the present invention in the unclamped state.

[0024] Figure 8 This is a schematic diagram of the telescopic positioning component in the start-up state of the present invention.

[0025] Figure 9 This is a schematic diagram of the thermoplastic FRP reinforcement of the present invention in a clamped state.

[0026] Figure 10 This is a schematic diagram of the first state of the thermoplastic FRP reinforcement of the present invention when bent.

[0027] Figure 11 This is a schematic diagram of the second state structure of the thermoplastic FRP bar of the present invention when bent.

[0028] Figure 12 This is a schematic diagram of the third state structure of the thermoplastic FRP bar of the present invention when bent.

[0029] Figure 13 This is a flowchart of the hand-held heating and bending method for thermoplastic FRP ribs according to the present invention.

[0030] The numbers in the diagram represent: 1. Handheld component; 11. Base; 12. Handheld handle; 13. Integrated control box; 14. Rotary connector; 2. Telescopic component; 21. First telescopic component; 22. Base plate; 23. Slide groove; 24. Rotating groove; 3. Molded component; 31. Rigid heating ring; 311. Upper half heating ring; 312. Lower half heating ring; 313. Connector; 314. Drive component; 315. Ball rotating component; 32. Flexible capsule; 321. Flexible film; 322. Thermally conductive liquid; 33. Telescopic positioning assembly; 4. Thermoplastic FRP rib. Detailed Implementation

[0031] To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention 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 the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] In view of the shortcomings of the prior art, this embodiment provides a handheld heating and bending device and method for thermoplastic FRP ribs, which can be referred to as follows: As attached Figure 1 and attached Figure 2 As shown, a handheld heating and bending device for thermoplastic FRP ribs includes a handheld component 1, a telescopic component 2, and a forming component 3. The handheld component 1 is a handheld portable support base with an integrated liquid storage component, realizing the integrated storage and delivery of heat-conducting liquid 322. The telescopic component 2 consists of multiple horizontally arranged first telescopic members 21, mounted on the end of the handheld component 1, and can independently extend and retract to adjust the bending stroke. The forming component 3 is composed of multiple sets of rigid heating rings 31, an internal flexible bladder 32, and a telescopic positioning component 33. The multiple sets of rigid heating rings 31 can... Each component is rotatably mounted on the end of the corresponding first telescopic component 21, and can be independently deflected to adjust the bending angle; the flexible bladder 32 is fixed inside the rigid heating ring 31, and a high-temperature resistant and thermally conductive flexible film 321 is provided on the inner side. The flexible bladder 32 is filled with thermally conductive liquid 322. The liquid storage component is connected to the flexible bladder 32 through a pipe, and the filling and recovery of the thermally conductive liquid 322 can be completed in a controllable manner. Multiple sets of telescopic positioning components 33 are radially arranged on the inner wall of the rigid heating ring 31, and their two ends are respectively connected to the inner wall of the rigid heating ring 31 and the flexible film 321 to achieve coaxial positioning of the ribs.

[0035] Among them, the handheld component 1 is a handheld portable control base, suitable for handheld operation on construction sites, unlike traditional large fixed bending equipment, it is portable and mobile; the liquid storage component is a heat-conducting medium storage and circulation unit, providing a medium source for filling and depressurizing the flexible bladder 32; the first telescopic component 21 is an independent linear drive component, the telescopic stroke of each group can be adjusted differently, providing multi-point bending power, the first telescopic component 21 can be an electric telescopic rod; the rigid heating ring 31 is a zoned independent heating component, which can precisely heat the preset bending area of ​​the thermoplastic FRP rib 4 in segments; the flexible bladder 32 is a flexible covering and pressure application component, relying on the heat-conducting liquid 322 to transfer temperature and force, flexibly adhering to the surface of the rib, avoiding rigid extrusion damage to the rib material; the telescopic positioning component 33 is a rib centering and limiting component, which can pre-tighten the flexible film 321 to ensure that the thermoplastic FRP rib 4 is centered and coaxially positioned.

[0036] Specifically, during operation, the operator holds the handle 12 with one hand, and the thumb can naturally touch the function buttons and adjustment knobs on the side wall of the integrated control box 13. Based on the preset program on the control circuit board inside the box, signals are sent to all the actuators of the device. First, pressing the opening / closing control button causes the drive component 314 to move synchronously, causing the upper heating ring 311 and the lower heating ring 312 to open outwards around a common rotating axis (as shown in the attached diagram). Figure 5 As shown in the attached diagram, the thermoplastic FRP rib 4 to be processed is smoothly placed into the central cavity surrounded by multiple sets of flexible bladders 32 along the side opening. After adjusting the alignment of the bent section of the rib with the positions of each set of rigid heating rings 31, the opening and closing button is pressed again, and the two halves of the heating rings are closed and locked, completing the initial positioning of the rib (as shown in the attached diagram). Figure 3 and attached Figure 7 (As shown).

[0037] Then, pressing the centering function button controls the circuit board to send a signal, triggering the synchronous activation of each group of telescopic positioning components 33. The radially arranged small telescopic rods extend inward synchronously, evenly pushing the highly elastic flexible film 321 towards the center, applying even force in the circumferential direction, and adhering to and clamping the outer wall of the thermoplastic FRP rib 4. This automatically completes the coaxial centering and limiting of the entire rib section, ensuring that every bending section is at the reference position of the cavity center (as shown in the attached figure). Figure 4 and attached Figure 8 (As shown). After centering, press the filling and heating button. The pump inside the liquid storage assembly starts, quantitatively injecting the thermally conductive liquid 322 from the liquid storage shell into the corresponding flexible cavity through an independent branch pipeline. Because the elasticity of the inner flexible film 321 is higher than that of the outer wall of the capsule, the injected thermally conductive liquid 322 preferentially diffuses and fills to one side of the rib, pushing the flexible film 321 to completely cover and adhere to the outer peripheral wall of the thermoplastic FRP rib 4 (as shown in the attached figure). Figure 9As shown), a uniform and continuous heat-conducting liquid film is formed; each group of rigid heating rings 31 is simultaneously energized and heated, and the heat is uniformly conducted to the surface of the rib through the heat-conducting liquid 322, so that each bending section is stably heated to the preset thermoplastic softening temperature.

[0038] After the ribs have softened to the required level, a bending signal is issued via the angle control knob of the integrated control box 13 or a preset process program. Each group of first telescopic components 21 performs differentiated telescopic displacement, causing the corresponding rigid heating ring 31 to adaptively deflect around the end universal ball joint node. This, in conjunction with the internal flexible bladder 32, causes synchronous flexible deformation along the bending trajectory, applying continuous and uniform bending force to the softened thermoplastic FRP ribs 4. This completes the continuous bending and forming of multiple ribs at different angles in a single operation. After bending to the required level, the device automatically locks and holds the pressure, maintaining the bending angle and covering pressure, while waiting for the ribs to cool and solidify.

[0039] Existing thermoplastic FRP (FRP) rebar bending equipment generally uses bending fixtures with fixed bending radii, lacking a structure that allows for flexible adjustment of the bending radius. When processing thermoplastic FRP rebars with different bending radii, the bending fixtures must be disassembled and reassembled multiple times, resulting in cumbersome processing procedures and significantly reducing the overall processing efficiency of the rebar. Compared with existing technologies, this solution relies on multiple sets of independently telescopic, independently heated, and independently deflected molding structures, combined with an integrated handheld structure, to construct an integrated handheld bending structure that allows for flexible adjustment of bending parameters. Furthermore, it can continuously, efficiently, and conveniently achieve integrated heating-bending-cooling operations for a single thermoplastic FRP rebar, fundamentally solving the core technical problems of low integration of heating-bending-cooling, insufficient bending radius adjustment capability, and low processing efficiency in traditional equipment.

[0040] Through the above technical solution, this application adopts an integrated handheld structure with multiple independent rigid heating rings 31 linked with differentiated first telescopic components 21. This eliminates the need for repeated disassembly and repositioning of the thermoplastic FRP rib 4, allowing for flexible adjustment of the bending angle without moving the rib itself, thus completely eliminating the cumbersome process of changing clamps multiple times. Combined with the fully enclosed temperature transfer and pressure application structure formed by the internal flexible bladder 32 and the heat-conducting liquid 322, heat is evenly conducted to the surface of each bending section of the rib through the liquid medium, avoiding the degradation of the rib matrix performance caused by localized overheating. During bending, the liquid pressure is evenly applied to the outer periphery of the rib, resulting in balanced bending force without localized stress concentration. This avoids defects such as cross-sectional depressions and surface fiber breakage that occur during traditional bending processes, significantly improving bending accuracy and the retention of rib mechanical properties.

[0041] Furthermore, during the entire process of bending and deformation of the thermoplastic FRP rib 4, the liquid storage component can synchronously and dynamically add or recover the heat-conducting liquid 322 according to the real-time changes in the internal volume of the flexible bladder 32, actively adapting to the dynamic increase or decrease in cavity volume caused by bending and deflection, and always maintaining the liquid pressure inside the flexible bladder 32 within the preset range.

[0042] This ensures that the flexible film 321 remains uniformly attached to the outer wall of the rib throughout the bending process, with balanced and unfluid circumferential covering pressure. This avoids excessive local extrusion pressure caused by fluid buildup in the cavity, which could damage the surface and internal fiber structure of the rib. It also prevents the cavity from expanding and depressurizing, which could lead to voids in the covering and uneven heat transfer. This ensures continuous and stable temperature and force transfer during bending, further improving the angular accuracy of multi-segment bending and the consistency of the finished product's mechanical properties.

[0043] As attached Figure 10 Appendix Figure 11 With appendix Figure 12 As shown, by relying on the differentiated extension lengths of the first telescopic components 21 in each group, and by adjusting the spacing between adjacent first telescopic components 21, the bending curvature and bending angle can be flexibly controlled to achieve precise bending and forming of thermoplastic FRP ribs 4 in different shapes; among which, attached Figure 10 This is the working state of thermoplastic FRP bar 4 after a 90° right-angle bend, attached. Figure 11 This is the working state of thermoplastic FRP bar 4 after a 45° bend. (See attached image) Figure 12 This is the working state of thermoplastic FRP bar 4 after a 180° bend.

[0044] In this embodiment, as shown in the appendix Figure 2 As shown, the handheld component 1 includes a base 11, a handheld handle 12, an integrated control box 13, a rotary connector 14, a built-in drive motor, a battery, and a control circuit board. The handheld handle 12 is vertically fixed to the top surface of the base 11, allowing for one-handed operation. The integrated control box 13 is fixedly installed on the top of the handheld handle 12. The integrated control box 13 contains a built-in drive motor and a control circuit board. The base 11 contains a battery that powers all electrical components of the device. The control circuit board sends unified linkage signals for extension, heating, infusion, and rotation. The rotary connector 14 is rotatably mounted on the front end of the integrated control box 13. The output shaft of the drive motor is coaxially fixed to the rotary connector 14. The extension component 2 is assembled and fixed on the outside of the rotary connector 14, and is rotated and reversed by the drive motor.

[0045] The base 11 serves as a counterweight support for the handheld component 1, enhancing stability during gripping and placement, and is equipped with a battery. The handheld handle 12 is an anti-slip grip component, conforming to an ergonomic grip design. The integrated control box 13 is an integrated electronic control cavity that integrates power supply, control, and power components, replacing the separate external electronic control and external power cord structure. The integrated control box 13 also features buttons and a display screen that are electrically connected to the control circuit board. The drive motor is an integrated reversing power component that drives the front-end telescopic bending structure to rotate circumferentially. The rotary connector 14 is a sealed transfer transmission component that ensures stable rotation while maintaining the continuity of lines and pipes. The built-in battery is removable and replaceable, enabling wireless handheld operation of the device and eliminating the limitations of external power cord wiring.

[0046] Specifically, when bending, the operator holds the hand handle 12 and issues commands through the integrated control box 13 to control the circuit board to start and stop the drive motor. The drive motor drives the rotating connector 14, the telescopic component 2, and the forming component 3 to rotate circumferentially as a whole, quickly switching the bending plane to adapt to bending conditions in different directions such as lateral and vertical. The entire process is wirelessly powered and electrically controlled in an integrated linkage.

[0047] Through the above technical solutions, the integrated electronically controlled handheld structure enables wireless and portable operation, adapting to various construction scenarios without external power supply, such as construction sites and outdoor areas; the drive motor links the front bending assembly to rotate and change direction as a whole, allowing switching of bending direction without rotating the thermoplastic FRP rib 4, maintaining the rib's centering state throughout the process, and avoiding secondary positioning deviations; the electronic control system centrally regulates various actions, resulting in strong operational linkage and further improving the convenience and forming accuracy of multi-angle irregular bending processing.

[0048] As attached Figure 2 As shown, the telescopic component 2 also includes a base plate 22, which is fixedly mounted on the outer end face of the rotary connector 14. A straight groove 23 is provided on the side of the base plate 22 away from the rotary connector 14. The tail ends of multiple first telescopic components 21 are slidably mounted inside the groove 23 through a damping assembly. The damping assembly can provide damping and limiting effect on the first telescopic components 21, and prevent movement of the first telescopic components 21 when they are working through the damping effect.

[0049] Among them, the base plate 22 is the integrated bearing plate of the telescopic component 2, ensuring that the arrangement benchmark of multiple sets of first telescopic components 21 is uniform; the linear slide 23 is a limiting sliding track, which constrains the linear displacement of the first telescopic component 21 and avoids sliding deviation; the damping component is existing technology, so that there is a certain friction between the first telescopic component 21 and the slide 23, preventing the first telescopic component 21 from sliding at will; the first telescopic component 21 adopts a sliding adjustable structure, which can flexibly change the spacing of each set of heating and bending points to adapt to different bending span processing requirements.

[0050] Specifically, during assembly and debugging, the base plate 22 is locked and fixed to the end face of the rotary connector 14, the straightness of the slide groove 23 is calibrated, and the tail ends of each group of first telescopic components 21 are embedded into the slide groove 23 with the damping component. According to the bending section spacing of the thermoplastic FRP rib 4 marked on the drawing, each group of first telescopic components 21 is slid to the corresponding scale position, and the position of the first telescopic component 21 is fixed by the friction of the damping component, thus locking the bending point spacing. During the bending operation, the first telescopic component 21 in the locked position only performs its own telescopic movement and will not slide or shift along the slide groove 23, ensuring that the bending spacing remains constant.

[0051] Through the above technical solution, the first telescopic component 21 can slide steplessly along the slide groove 23, and the spacing between each set of bending processing points can be flexibly adjusted to adapt to the processing of different bending spans and different sizes of irregular thermoplastic FRP ribs 4; the damping locking stability is strong, and the telescopic component will not slip or move during the bending force process, ensuring the accuracy of the bending spacing size. It can be adapted to a variety of product specifications without disassembly and modification, greatly improving the versatility of the device and its adaptability to working conditions.

[0052] Furthermore, the base plate 22 is provided with multiple slots, and each first telescopic member 21 is provided with a positioning hole on its surface. A positioning rod is provided in the slot, and the positioning rod can be inserted into the positioning hole to physically lock the first telescopic member 21 and prevent the first telescopic member 21 from moving.

[0053] As attached Figure 3 Appendix Figure 4 and attached Figure 5 As shown, the rigid heating ring 31 includes an upper heating ring 311, a lower heating ring 312, a connector 313, and two driving members 314. The upper heating ring 311 and the lower heating ring 312 share a rotating shaft and are synchronously mounted on the end of the connector 313. The two half-rings can be opened and closed to form a cylindrical receiving cavity for storing the flexible capsule 32. The outer side of the connector 313 is laterally rotated and connected to the first telescopic member 21. One end of the two driving members 314 is hinged to the side wall of the connector 313, and the other end is respectively hinged to the outer wall of the upper heating ring 311 and the lower heating ring 312, driving the two half-rings to open and close synchronously around the shared rotating shaft.

[0054] The common rotating shaft is a reference component for synchronous rotation of the two half rings, ensuring that the opening and closing of the two half heating rings are synchronized and the alignment is accurate. The upper half heating ring 311 and the lower half heating ring 312 are independent heating shells with separate zones. After being powered on, the ring body conducts heat evenly throughout its entire area, wrapping the flexible heating capsule 32. The connecting piece 313 is a transition hinge base, which enables the heating ring to be docked with the first telescopic member 21 at an adjustable angle. The driving component 314 is an electric opening and closing driving component with controllable bidirectional thrust, realizing the automatic opening and closing of the ring body. Unlike the manual prying opening and closing structure, the opening and closing force is uniform and the alignment and sealing are good. The driving component 314 can be an electric telescopic rod.

[0055] Specifically, during assembly, the upper heating ring 311 and the lower heating ring 312 are coaxially inserted into a common rotating shaft and hinged to the end of the connector 313. The two sets of drive components 314 are then hinged at both ends. The opening and closing strokes of the two half-rings are adjusted to ensure a seamless enclosure of the cylindrical cavity after closure. During the reinforcement insertion operation, the two sets of drive components 314 retract, pushing the two half-heating rings to open bidirectionally around the rotating shaft, expanding the cavity opening and facilitating the rapid transverse insertion of the long thermoplastic FRP reinforcement 4 into the bladder. After the reinforcement is in place, the drive components 314 extend, causing the two half-heating rings to close and lock, enclosing the flexible bladder 32 and providing a sealed pressure cavity for subsequent heating and bending.

[0056] Compared with existing technologies, most existing heated bending rings are one-piece closed ring structures that can only be inserted from the end of the rib. Long, irregularly shaped thermoplastic FRP ribs 4 cannot be inserted laterally, making material insertion and removal extremely inconvenient. Furthermore, the closed ring cannot be opened or closed, and after bending and shaping, it easily clings to the outer wall of the rib, resulting in high resistance to demolding and easy scratching and damage to the formed rib surface after bending. This solution solves the technical problems of inconvenient material insertion, difficult demolding, and easy damage to the outer wall of the thermoplastic FRP rib 4 caused by the one-piece ring structure with a shared rotating shaft and a bidirectional half-opening and closing heating ring structure.

[0057] Through the above technical solution, the semi-open rigid heating ring 31 can be opened and closed quickly from the side, and the long strip thermoplastic FRP rib 4 can be inserted laterally, making material insertion and removal convenient and efficient, and adaptable to the rapid loading and unloading of long-sized rib materials; after closing, the ring body has good sealing performance, strong thermal conductivity and cohesion, and higher heating efficiency; there is no hard scraping when opening and closing and demolding, and the outer wall of the thermoplastic FRP rib 4 in the heat softening state is protected in all aspects, avoiding damage to the rib surface and structure, and ensuring the mechanical properties of the finished rib material.

[0058] In this embodiment, as shown in the appendix Figure 3 As shown, a square rotating groove 24 is provided at one end of the first telescopic member 21 near the connector 313. A spherical groove is provided on the inner wall of the rotating groove 24. The connector 313 is connected to a ball rotating member 315 integrally formed at one end of the first telescopic member 21. The ball rotating member 315 is universally embedded in the ball groove. The connector 313 can rotate laterally by the restriction of the ball rotating member 315 and the square rotating groove 24.

[0059] Among them, the ball groove and the ball rotating component 315 form a universal ball hinge transition structure, which is different from the ordinary hinge and pin shaft unidirectional rotation structure and has three-dimensional universal deflection capability; the rotating groove 24 is a limiting sliding cavity that limits the radial displacement of the ball hinge; the universal ball hinge is an angle adaptive transition component that can adapt to the bending force angle, eliminate the bending lateral shear force, and avoid jamming at the transition position.

[0060] Specifically, during bending operations, the first telescopic component 21 extends and pushes linearly, while the ball rotating component 315 adaptively deflects the angle, causing the rigid heating ring 31 and the flexible bladder 32 to slightly adjust their angles along the bending deformation direction of the thermoplastic FRP rib 4, adapting to bending conditions such as arc bending and oblique bending. When subjected to bending force, the connecting component 313 can slide slightly to buffer the extrusion force and avoid stress overload of the transition structure.

[0061] Through the above technical solutions, the ball joint transition structure can achieve lateral deflection of the heating ring, adapting to arc, oblique, and multi-directional composite irregular bending processing, greatly improving the adaptability of the device to bending conditions; the bending process adaptive angle fine adjustment disperses the force on the transition node, buffers the bending extrusion pressure, reduces the failure rate of the hinge node, and improves the service life of the device structure, while ensuring that the bending deformation conforms to the natural bending trajectory of the rib, avoiding the generation of large stress inside the rib.

[0062] Furthermore, the mating structure between the ball rotating component 315 and the ball groove can be replaced with a rotating shaft. The rotating shaft can pass through the connector 313 vertically and vertically, and the rotating shaft is rotatably set in the rotating groove 24. The upper and lower surfaces of the rotating groove 24 restrict the vertical rotation of the connector 313, thereby realizing the lateral rotation of the connector 313.

[0063] In this embodiment, as shown in the appendix Figure 5 As shown, the flexible capsule 32 has a through-type feeding opening on its side, and the opening position is precisely corresponding to the closed splicing gap of the upper half heating ring 311 and the lower half heating ring 312. The opening can open and close synchronously with the opening and closing of the two half heating rings. The side wall of the flexible capsule 32 is fully connected and arranged, with one end extending seamlessly from the inner wall near the gap end of the upper half heating ring 311 to the inner wall of the gap end of the lower half heating ring 312, forming a seamless, fully enclosed flexible cavity.

[0064] Among them, the side synchronous opening is a linked opening and closing feed port, which opens and closes synchronously with the opening and closing of the heating ring, without the need for separate control of opening and closing; the gap alignment opening structure avoids the pressure-bearing area of ​​the main body of the bladder, resulting in better liquid filling and sealing performance; the full-area extended bladder is a fully enclosed flexible medium cavity with no splicing gaps and no dead corners, unlike the segmented splicing bladder, it can fit the outer peripheral wall of the thermoplastic FRP rib 4 in all directions, with no blind spots in heat conduction and pressure application.

[0065] Specifically, during assembly, the side openings of the flexible bladder 32 are aligned with the seams of the two heating ring halves and fixed in place, ensuring that the openings open synchronously when the rings open and close tightly when the rings close. When the rigid heating ring 31 opens in half, the bladder openings synchronously, and the thermoplastic FRP rib 4 is directly inserted through the side opening without the need to squeeze the bladder through the rib. After the rings close, the openings are sealed tightly. After the heat-conducting liquid 322 is added, the bladder completely covers the periphery of the rib, and the liquid pressure is evenly applied to the entire area of ​​the rib. When bent, the bladder deforms synchronously with the rings, without any local voids or local compression.

[0066] Through the above technical solution, the opening of the capsule is linked to the opening and closing of the heating ring, which is matched with the lateral rapid material feeding process, resulting in higher material loading and unloading efficiency; the extended capsule completely covers the outer periphery of the bent section of the thermoplastic FRP rib 4, ensuring uniform heat conduction, balanced confining pressure, and consistent degree of thermal softening. After bending, the rib cross-section is regular without depression or deformation, preserving the original mechanical properties of the thermoplastic FRP rib 4 to the greatest extent and ensuring that the load-bearing capacity of the bent rib material meets the standards.

[0067] In this embodiment, as shown in the appendix Figure 3 and attached Figure 4 As shown, the telescopic positioning component 33 includes multiple radially arranged small telescopic rods. The outer ends of the small telescopic rods are fixed to the inner wall of the rigid heating ring 31, and the telescopic ends are uniformly connected to the inner flexible film 321. The elasticity of the inner flexible film 321 is greater than that of the outer wall of the flexible bladder 32. When the bladder is filled with heat-conducting liquid 322, the internal pressure preferentially pushes the highly elastic flexible film 321 to contract and gather inward, pre-coaxially wrapping and adhering to the outer wall of the thermoplastic FRP rib 4.

[0068] Among them, the radial small telescopic rod is the centering traction component, which is evenly arranged around the circumference and the traction force is balanced around the circumference; the high elasticity flexible film 321 is the centering and bonding inner film, which has greater deformation elasticity and preferentially shrinks inward under pressure; the low elasticity outer wall of the capsule is the pressure-bearing deformation outer layer, which adapts to bending deformation after being pressed. The inner and outer double-layer elasticity differential design realizes the linkage logic of centering first and then bending under pressure.

[0069] Specifically, during the pre-bending centering operation, multiple sets of small telescopic rods extend synchronously and slightly, pushing the flexible film 321 inward to gather it together and initially clamp the thermoplastic FRP rib 4 to the center and position it. Subsequently, the liquid storage component injects heat-conducting liquid 322 into the bladder. Relying on the elastic difference between the inner and outer films, the liquid pressure first squeezes the inner flexible film 321 to adhere to and hug the rib, completing the coaxial centering and limiting. After the liquid continues to pressurize, it pushes the outer bladder to deform, and with the help of the heating ring, it completes the angle bending. Throughout the process, the rib remains in the center position of the cavity.

[0070] Through the above technical solution, the radial telescopic rod, in conjunction with the highly elastic inner membrane, achieves front coaxial centering. By utilizing the difference in material elasticity, automatic centering during liquid filling is achieved, avoiding the problem of eccentric bending of thermoplastic FRP rib 4. After bending, the rib body is free from twisting and the angle is standard. Fully automatic mechanical centering replaces manual alignment, and the centering benchmark of each rib body is uniform. The bending dimensions of batch processing are highly consistent, effectively improving the yield of thermoplastic FRP rib 4 finished products.

[0071] Furthermore, the aforementioned telescopic positioning component 33 is not limited to a radial small telescopic rod structure; it can also be replaced with other drive devices with linear displacement output capabilities, such as micro electric push rods, piezoelectric linear actuators, and micro cylinders, as long as it can stably push the flexible film 321 towards the center and complete the coaxial centering of the ribs. This modular design can be flexibly adapted and selected according to the power conditions, accuracy requirements, and cost needs of the on-site operation. Moreover, the replacement does not change the core working logic of the flexible capsule 32's liquid filling, uniform heat conduction, and follow-up bending, and can still achieve precise centering and limiting of the thermoplastic FRP ribs 4 and multi-segment synchronous bending processing.

[0072] Furthermore, due to its thin structural characteristics, the flexible film 321 has a relatively small overall thickness and high toughness. During the process of being pushed and bonded to the outer wall of the thermoplastic FRP rib 4 by the telescopic positioning component 33, fine local wrinkles will naturally form on the film surface. These wrinkles are merely adaptive morphological changes during the film bonding process. They do not hinder the heat-conducting liquid 322 from uniformly transferring heat to the rib surface, nor do they interfere with the synchronous deformation and pressure application of the flexible bladder 32 with the bending angle. They do not adversely affect the heating and softening effect or the bending and forming process of the thermoplastic FRP rib 4.

[0073] In this embodiment, as shown in the appendix Figure 6 As shown, the flexible capsule 32 is divided into multiple independent flexible cavities. The multiple flexible cavities are arranged sequentially along the inner wall of the rigid heating ring 31 to form a ring structure. Each set of cavities is independently connected to the infusion pipeline, and each set of pipelines is independently connected to the liquid storage component, so as to realize the individual filling and individual recovery of the heat-conducting liquid 322 in each set of cavities.

[0074] Among them, the independent flexible cavity is a partitioned pressure-bearing and heat-conducting cavity, with each group of cavities being independent of each other and their hydraulic systems not interfering with each other; the independent infusion pipeline is a partitioned medium control channel, which can independently control the hydraulic pressure and medium temperature of a single cavity; unlike the integrated connected large cavity structure, it can realize independent control of bending force and softening temperature at a single bending point, adapting to different bending processing needs.

[0075] Specifically, during the bending operation, the amount of heat-conducting liquid 322 added to the corresponding cavity is individually adjusted according to the different bending angles and bending curvature requirements of the thermoplastic FRP rib 4, and the heating temperature at that point is individually controlled. At large-angle bending points, the hydraulic pressure is increased to enhance the bending thrust, while at small-angle points, the hydraulic pressure is reduced to avoid overloading of the rib body. The bending and shaping are completed in a segmented and differentiated manner.

[0076] Through the above technical solutions, the independent cavity in each section can achieve independent control of hydraulic pressure and heating temperature at a single bending point, accurately matching the force requirements of different bending curvatures. It provides sufficient thrust for large-angle bending and flexible pressure relief protection for small-angle bending, taking into account both bending forming efficiency and rib protection. The segmented independent control does not interfere with each other, adapting to the bending processing of composite thermoplastic FRP ribs with varying curvatures and angles, further expanding the processing and adaptability range of the device.

[0077] In this embodiment, the liquid storage assembly includes a liquid storage shell, a pump body, a switching valve, and a radiator. The liquid storage shell, pump body, and radiator are integrated and encapsulated inside the integrated control box 13. The liquid storage shell stores a heat-conducting liquid 322 for heat exchange. The pump body inlet is connected to the liquid storage shell, and the pump body outlet is connected to the liquid delivery end of each set of flexible cavities. A return pipe is separately arranged in the flexible cavity and connected to the liquid storage shell. The return pipe is connected in series with the switching valve that controls the on and off. The radiator is arranged in close contact with the outer wall of the liquid storage shell to reduce the temperature of the return heat-conducting liquid 322 through convective heat exchange.

[0078] The liquid storage shell is a sealed storage cavity for the thermally conductive liquid 322, which isolates air and prevents the medium from oxidizing and deteriorating; the pump body is a power component for medium circulation and transportation, realizing bidirectional transportation of liquid pressurization and injection, and negative pressure recovery; the switch valve is a flow control component, which precisely controls the pressure holding bending and pressure release reflux processes; the radiator adopts existing technology and is a forced heat exchange and cooling component, which accelerates the heat dissipation of the thermally conductive liquid 322 and quickly removes the heat from the bending section of the thermoplastic FRP rib 4, which is different from natural air cooling and greatly improves the shaping efficiency.

[0079] Specifically, in the early stage of operation, the pump body runs in the forward direction, drawing low-temperature heat-conducting liquid 322 from inside the liquid storage shell, pressurizing and transporting it to each group of independent flexible cavities to complete the filling and pressure-holding bending; after the bending angle is in place, the rigid heating ring 31 is de-energized and stops heating, the return pipe switch valve is opened, and the pump body recovers the high-temperature heat-conducting liquid 322 inside the cavity under negative pressure. After the high-temperature liquid flows back to the liquid storage shell, it adheres to the radiator for rapid convection cooling and circulates to achieve circulating heat dissipation.

[0080] Through the above technical solutions, the heat-conducting liquid 322 is added and recycled in a closed loop, and the medium can be reused for a long time, saving processing material costs; the radiator is forced to exchange heat and cool down, which greatly shortens the cooling, curing and shaping time of thermoplastic FRP rib 4 and improves batch processing efficiency; the residual heat of the cavity is removed in real time, the bending operation temperature range is stabilized, high temperature damage to the rib is avoided, and the appearance and mechanical properties of the bent product are stable, which is suitable for continuous batch bending operations on construction sites.

[0081] As attached Figure 13 As shown, this application also proposes a hand-held heating and bending method for thermoplastic FRP ribs, implemented based on the above-mentioned bending device, including the following steps: Step S100: The thermoplastic FRP bar to be processed is coaxially placed into the clamping and bending cavity formed by the flexible bladder. Step S200: Activate the multiple sets of telescopic positioning components to make the flexible film adhere to and clamp the outer wall of the thermoplastic FRP rib, thereby completing the coaxial centering and limiting of the thermoplastic FRP rib. Step S300: Start the liquid storage component. The liquid storage component quantitatively injects heat-conducting liquid into the flexible bladder and simultaneously starts each rigid heating ring. The rigid heating ring uniformly heats the heat-conducting liquid in the cavity, so that the thermoplastic FRP rib is heated and softened to a bendable and deformable state. Step S400: Through the differentiated expansion and contraction displacement of the first expansion member arranged laterally, the corresponding rigid heating and surrounding connection end is driven to deflect, and the flexible bladder is synchronously deformed, applying bending force to the softened thermoplastic FRP bar, bending the thermoplastic FRP bar to a preset bending angle. Step S500: Stop the rigid heating ring from supplying heat, and wait for the heat-conducting liquid to circulate and dissipate heat, and for the thermoplastic FRP rib to cool, solidify and set, thus completing a single thermoplastic FRP rib heating and bending operation.

[0082] Among them, the side opening and closing positioning process is a convenient material feeding process, which is suitable for quick clamping of long strip thermoplastic FRP ribs; the telescopic centering process is a mechanical coaxial limiting process, which replaces manual alignment and ensures uniform centering accuracy; the zoned liquid filling and heating process is a flexible and uniform temperature transfer process, which prevents local overheating damage to the ribs; the differentiated telescopic bending process is an in-situ continuous bending process, which does not require disassembly and assembly of the ribs; the circulating heat dissipation and shaping process is a rapid cooling process, which shortens the processing waiting time. The whole process is suitable for handheld in-situ integrated bending processing.

[0083] Specifically, during the bending process, the operator holds the hand handle 12 and controls the drive component 314 to open each group of rigid heating rings 31. After the thermoplastic FRP rib 4 is placed laterally, the ring body is closed. The small telescopic rod extends synchronously, pushing the flexible film 321 to clamp the rib in the center and complete the centering. The pump body pumps the heat-conducting liquid 322 into the independent cavity in sections. The rigid heating rings 31 are energized and heated. The liquid conducts heat throughout the entire area to soften the bending section of the rib. The control circuit board adjusts the first telescopic component 21 of each group to perform differentiated telescopic expansion and contraction. With the help of the universal ball joint, the angle is finely adjusted to bend and form a multi-segment irregular structure in one go. Then, the heating is turned off and the reflux switch valve is opened. The high-temperature liquid refluxes to dissipate heat. After the rib is kept at a constant temperature and shaped, the heating ring is opened and the finished thermoplastic FRP rib 4 is taken out.

[0084] Through the above technical solution, this bending method achieves simultaneous bending and forming of multiple segments in situ with a single clamping, eliminating multiple clamping and alignment processes, eliminating clamping and positioning errors from the source of the process, and achieving high bending dimensional accuracy; the entire process of mechanical centering, zoned temperature control, and forced heat dissipation is fully automated, requiring less manual intervention and having a low operating threshold; it is suitable for flexible handheld operation on construction sites, with controllable processing rhythm, and good consistency in the bending and forming of thermoplastic FRP ribs in four batches.

[0085] Other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the solutions disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of the invention are indicated by the claims.

Claims

1. A handheld heating and bending device for thermoplastic FRP ribs, characterized in that, include: A handheld component, a telescopic component disposed on the handheld component, and a molding component disposed on the telescopic component; The handheld component is equipped with a liquid storage assembly; The telescopic component includes a plurality of first telescopic members laterally disposed at one end of the handheld component; The molding component includes multiple rigid heating rings, a flexible bladder, and multiple sets of telescopic positioning components. The multiple rigid heating rings are rotatably disposed at one end of multiple first telescopic components. The flexible bladder is disposed inside the multiple rigid heating rings and connected to the inner wall of the multiple rigid heating rings. The inner side of the flexible bladder is a flexible film. The interior of the flexible bladder is filled with a heat-conducting liquid. The liquid storage component is connected to the flexible bladder to fill or recycle the heat-conducting liquid inside the flexible bladder. The multiple sets of telescopic positioning components are disposed inside the flexible bladder, with one end of the telescopic positioning component disposed on the rigid heating ring and the other end disposed on the flexible film.

2. The handheld heating and bending device for thermoplastic FRP ribs according to claim 1, characterized in that, The handheld component includes a base, a handheld handle disposed on the base, an integrated control box disposed on the handheld handle, and a rotary connector disposed at the front end of the integrated control box. The integrated control box is equipped with a drive motor, the output shaft of which is coaxially connected to the rotary connector, and the telescopic component is mounted on the rotary connector.

3. The handheld heating and bending device for thermoplastic FRP ribs according to claim 2, characterized in that, The telescopic component also includes a base plate disposed on the rotary connector. A groove is provided on the side of the base plate away from the rotary connector, and one end of the first telescopic component is slidably disposed in the groove.

4. The handheld heating and bending device for thermoplastic FRP ribs according to claim 1, characterized in that, The rigid heating ring includes an upper heating ring, a lower heating ring, a connector, and two driving components; The upper and lower heating rings are rotatably mounted on the connector via a rotating shaft. The upper and lower heating rings cooperate to form a cylindrical receiving cavity to accommodate the flexible capsule. The end of the connector away from the cylindrical receiving cavity is laterally rotatably connected to the first telescopic member. One end of each of the two driving members is hinged to the connector, and the other end is hinged to the upper and lower heating rings respectively, so as to drive the upper and lower heating rings to rotate around the rotating shaft.

5. A handheld heating and bending device for thermoplastic FRP ribs according to claim 4, characterized in that, The first telescopic member has a rotating groove at one end near the connector, and a ball groove is provided in the rotating groove. The connector has a ball rotating member at one end near the first telescopic member, and the ball rotating member is rotatably disposed in the ball groove. One end of the connector is slidably engaged with the rotating groove.

6. A handheld heating and bending device for thermoplastic FRP ribs according to claim 4, characterized in that, An opening is provided on one side of the flexible bladder, which corresponds to the closed portion of the upper and lower heating rings and opens and closes as the upper and lower heating rings rotate.

7. The handheld heating and bending device for thermoplastic FRP ribs according to claim 1, characterized in that, The telescopic positioning assembly includes a plurality of small telescopic rods arranged radially on the inner wall of the rigid heating ring, and the protruding ends of the small telescopic rods are connected to the flexible film.

8. A handheld heating and bending device for thermoplastic FRP ribs according to claim 1, characterized in that, The flexible capsule includes multiple independent flexible cavities, which are arranged sequentially along the inner wall of the rigid heating ring, and are connected to the liquid storage assembly via pipes.

9. A handheld heating and bending device for thermoplastic FRP ribs according to claim 2, characterized in that, The liquid storage assembly includes a liquid storage housing and a pump body disposed within the integrated control box; The liquid storage shell contains a heat-conducting liquid. The liquid storage shell is connected to the inlet of the pump body through a pipe, and the outlet of the pump body is connected to the flexible bladder through a pipe. The flexible bladder is connected to the liquid storage shell through a return pipe, and a switch valve is provided on the return pipe.

10. A method for hand-held heating and bending of thermoplastic FRP bars, based on the hand-held heating and bending device for thermoplastic FRP bars according to any one of claims 1-9, characterized in that, include: The thermoplastic FRP bar to be processed is coaxially placed inside the clamping and bending cavity formed by the flexible bladder; Activate the multiple sets of telescopic positioning components to make the flexible film adhere to and clamp the outer wall of the thermoplastic FRP rib, thereby completing the coaxial centering and limiting of the thermoplastic FRP rib; The liquid storage component is activated, which quantitatively injects heat-conducting liquid into the flexible bladder and simultaneously activates each rigid heating ring, so that the thermoplastic FRP rib is heated and softened to a bendable and deformable state. By applying differentiated expansion and contraction displacements to multiple first expansion members, a bending force is applied to the softened thermoplastic FRP bar, bending the thermoplastic FRP bar to a preset bending angle. Stop the rigid heating ring from supplying heat, and wait for the heat-conducting liquid to circulate and dissipate heat, allowing the thermoplastic FRP rib to cool, solidify, and set, thus completing a single thermoplastic FRP rib heating and bending operation.

Images