A nuclear power plant self-feedback temperature control and self-adaptive variable-diameter transparent hose heating device

Abstract

This invention relates to the field of nuclear power plant maintenance and instrumentation technology, and discloses a transparent flexible hose heating device for self-feedback temperature control and adaptive diameter change in nuclear power plants. It includes an electrically connected controller and a heating mechanism. The heating mechanism has a fixed plate with a stationary handle connected to it. A driving gear and a set of driven gears are mounted on the fixed plate. The driving gear is an internal meshing gear, and the set of driven gears are external meshing gears that mesh with the driving gear. Each driven gear is connected to a heating copper plate that rotates in the same direction. The heating copper plate provides heating. A rotating ring is provided outside the driving gear, and a moving handle is connected to the rotating ring. A compression spring is provided between the moving handle and the stationary handle. This invention enables instant softening of the pipeline interface, facilitating safe connection to instruments. After the pipeline cools, it becomes firmly attached to the instrument joint, preventing minor pipeline damage due to improper operation from causing instrument malfunctions.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant maintenance instrumentation technology, and in particular to a transparent flexible heating device for nuclear power plant self-feedback temperature control and adaptive diameter change. Background Technology

[0002] For differential pressure switches commonly found in nuclear power plant ventilation systems, during instrument inspections, improper installation of instrument pipes can lead to air leakage at the instrument interface during production operation, causing the differential pressure switch to be falsely triggered, resulting in the unexpected closure of valves or fans.

[0003] There is currently no method for safely assembling instrumentation lines in nuclear power plants using heating devices. Therefore, it is necessary to design a transparent flexible heating device with self-feedback temperature control and adaptive diameter adjustment for nuclear power plants to solve the above problems. This is of great significance for the safe assembly and maintenance convenience of instrumentation lines. Summary of the Invention

[0004] The purpose of this invention is to provide a transparent flexible tube heating device for nuclear power plants with self-feedback temperature control and adaptive diameter change. The heating device can soften the pipeline interface in time, making it easy to connect to the instrument safely. After the pipeline cools down, it is firmly attached to the instrument joint. This method avoids the instrument malfunction caused by minor damage to the pipeline due to improper operation.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A transparent flexible tube heating device for self-feedback temperature control and adaptive diameter change in nuclear power plants includes an electrically connected controller and a heating mechanism. The heating mechanism has a fixed plate with a stationary handle connected to it. A driving gear and a set of driven gears are mounted on the fixed plate. The driving gear is an internal meshing gear, and the set of driven gears is an external meshing gear that meshes with the driving gear. Each driven gear is connected to a heating copper sheet that rotates in the same direction. The heater heats the heating copper sheet. A rotating ring is provided outside the driving gear, and a moving handle is connected to the rotating ring. A compression spring is provided between the moving handle and the stationary handle.

[0007] In some embodiments, the heating mechanism has a heater storage box, and the heater is disposed within the heater storage box.

[0008] In some embodiments, the heater storage box is provided with a voltage input interface for connecting the positive and negative terminals of an external power supply, which is then connected to the positive and negative taps of the heater.

[0009] In some embodiments, the heater storage tank is connected to the fixing plate via a cable tray.

[0010] In some embodiments, the number of the driven gears in a set is 4, and they are evenly distributed circumferentially at equal angles.

[0011] In some embodiments, the heating copper sheet is horn-shaped, with its bottom connected to the driven gear, and the inner arc of the heating copper sheet clamps and heats the transparent flexible tube.

[0012] In some embodiments, each of the heating copper plates is connected and fastened to the driven gear at the corresponding position by a copper post and a screw, so that when the driven gear rotates, it drives the heating copper plate to rotate in the same direction.

[0013] In some embodiments, the controller includes an electrically connected TFTLCD screen, a power interface, an STM32 chip, buttons, LEDs, a heater temperature acquisition interface, a transparent hose temperature acquisition interface, and a GPIO interface.

[0014] In some embodiments, the heater includes a 0.3μF capacitor, a positive tap, a copper wire, a relay, a negative tap, and an IGBT component. The three 0.3μF capacitors are connected in parallel, the collectors of the two IGBT components are connected in parallel across the two ends of the capacitors, the gates of the two IGBT components are connected together, and the emitter is connected to the negative tap.

[0015] In some embodiments, the moving handle and the stationary handle form an acute angle.

[0016] Compared with existing technologies, the transparent flexible heating device for nuclear power plants with self-feedback temperature control and adaptive diameter variation provided by this invention has the following advantages:

[0017] This invention enables instant softening of pipeline interfaces, facilitating safe connection to instruments. After the pipeline cools, it becomes firmly attached to the instrument joint, preventing instrument malfunctions caused by minor pipeline damage due to improper operation.

[0018] The adaptive variable diameter clamp provided by this invention uses four horn-shaped copper plates, which greatly increases the heat dissipation area and avoids heat accumulation. Under the action of the continuous mechanism of spring, moving handle, rotating ring, driving gear and driven gear, the heated copper plates can be gradually rotated counterclockwise, thereby realizing the variable diameter function, and is suitable for transparent hoses of φ6~φ12.

[0019] This invention uses capacitors, IGBTs, and copper wires to build a heating circuit, which has the advantages of controllable power, strong thermal conductivity, and good ductility.

[0020] This invention features self-feedback temperature control, achieved by the controller acquiring real-time surface temperatures of the heating copper sheet and the transparent flexible tube, and updating the display in real-time on the human-machine interface. The heating process uses a PWM signal to control the heater's start and stop, calculating the unit-time temperature increment of the transparent flexible tube surface and controlling the PWM signal to ensure temperature controllability. Maintenance personnel can adjust the heating temperature range via button input, ensuring manual temperature control.

[0021] Furthermore, the transparent flexible tube temperature control logic provided by the invention has strong generalization ability, and the adaptive variable diameter clamp can ensure high heat transfer rate, high thermal conductivity and heat dissipation, providing convenience for maintenance personnel, strong safety, simple operation and easy maintenance.

[0022] This invention is the first to propose a technical solution for heating transparent flexible tubes with self-feedback temperature control and adaptive diameter variation. Attached Figure Description

[0023] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the technical description will be briefly introduced below.

[0024] Figure 1 This is a schematic diagram of the controller provided by the present invention;

[0025] Figure 2 The transparent flexible tube temperature control flowchart provided by the present invention;

[0026] Figure 3 The heater state control flowchart provided by the present invention;

[0027] Figure 4 This is a schematic diagram of the adaptive variable diameter clamp provided by the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the fixing plate provided by the present invention;

[0029] Figure 6 This is a schematic diagram of the initial state of the adaptive variable diameter clamp provided by the present invention;

[0030] Figure 7 This is a schematic diagram of the heater provided by the present invention. Detailed Implementation

[0031] The following detailed description provides further details on specific implementation methods.

[0032] like Figures 1 to 7As shown, this invention provides a transparent flexible tube heating device for nuclear power plants with self-feedback temperature control and adaptive diameter variation, including a controller 1, a human-machine interface, and a heating mechanism 3. This device can collect the surface temperatures of the copper sheet 3-2 and the transparent flexible tube in real time, control the temperature increment of the transparent flexible tube, and display the data visually on a TFT-LCD screen 1-1, facilitating real-time monitoring of the heating status by maintenance personnel. The heating mechanism 3 uses a horn-shaped copper sheet, which has strong thermal conductivity and heat dissipation properties and can adaptively retract to clamp the transparent flexible tube, making it suitable for various pipeline sizes. Logic control and heating parameters are set for the controller 1 to ensure uniform heating of transparent flexible tubes of various sizes without generating hot spots. This invention is of great significance for the safe installation and convenient maintenance of instrument pipelines.

[0033] like Figure 1 As shown, controller 1 includes a TFTLCD screen 1-1, a power interface 1-2, an STM32 chip 1-3, buttons 1-4, LEDs 1-5, a heater temperature acquisition interface 1-6, a transparent hose temperature acquisition interface 1-7, and a GPIO interface 1-8.

[0034] STM32 chips 1-3 are STM32F103RCT6, powered by a 5V external power supply connected to power interface 1-2. One GPIO interface 1-8 drives LED 1-5 to indicate the heating status; it lights up when heating is in progress. Two GPIO interfaces 1-8 serve as input channels for buttons 1-4 to adjust the heating temperature range. A general-purpose counter outputs a PWM waveform; by setting the duty cycle, the start and stop times of the heater are controlled, thus controlling the temperature increment of the transparent hose. A DS18B20 temperature sensor is connected to heater temperature acquisition interface 1-6 to obtain the heater temperature. A DS18B20 temperature sensor is also connected to transparent hose temperature acquisition interface 1-7 to obtain the surface temperature of the transparent hose.

[0035] like Figure 1 As shown, buttons 1-4 include the RESET button, KEY1 button, and KEY2 button.

[0036] The human-machine interface uses a 2.8-inch, 320*240 resolution TFTLCD module, directly powered by a microcontroller, with a 16-bit 8080 parallel interface for parallel communication with the microcontroller. The TFTLCD screen (1-1) displays the real-time temperature of the heater and the surface temperature of the transparent tube, as well as the heating temperature range. The screen displays "HeaterTemp:" on the first line, "Tube Temp:" on the second line, and "Heating Temp Range:" on the third line. The heating temperature range is defined by heating the transparent tube to a specific temperature range with a set temperature difference of 5℃, for example, heating to 45-50℃ or 50-55℃. The temperature range can be manually adjusted using buttons 1-4, with an initial temperature set at 70-75℃. Pressing button KEY1 decreases both the upper and lower limits of the range by 5℃, and pressing button KEY2 increases both limits by 5℃. RESET is the reset button, which can reset controller 1 and restore the hardware to its initial state.

[0037] like Figures 4 to 7 As shown, the heating mechanism 3 includes two parts: an adaptive variable diameter clamp and a heater. The adaptive variable diameter clamp includes a driven gear 3-1, a copper sheet 3-2, a voltage input interface 3-3, a heater storage box 3-4, a bridge 3-5, a driving gear 3-6, a stationary handle 3-7, a compression spring 3-8, a moving handle 3-9, a rotating ring 3-10, and a fixing plate 3-11.

[0038] Driven gear 3-1 is an external meshing gear with 20 teeth and a root circle diameter of φ4 (4mm). Driving gear 3-6 is an internal meshing gear with 40 teeth and a root circle diameter of φ18. The four driven gears 3-1 are evenly distributed circumferentially at equal angles and are located inside the driving gear 3-6, all of which mesh with the driving gear 3-6.

[0039] The heating mechanism 3 has four identical copper plates 3-2. Each copper plate 3-2 is horn-shaped, with its bottom connected to the driven gear (3-1) and its tip extending into the driving gear 3-6. Its inner arc diameter is φ12, its outer arc diameter is φ14, and its thickness is 0.3cm. The copper plates 3-2 have good thermal conductivity and ductility. The inner arc of the copper plate 3-2 is responsible for clamping and heating the transparent flexible tube. The four copper plates 3-2 are mounted at equal angles on the fixing plate 3-11 and secured with screws. Each copper plate 3-2 is connected and secured to the corresponding driven gear 3-1 via a copper post and screws, so that when the driven gear 3-1 rotates, it drives the copper plate 3-2 to rotate in the same direction.

[0040] The heater storage box 3-4 is located below the fixing plate 3-11. The heater storage box 3-4 and the fixing plate 3-11 are connected by a cable tray 3-5, and there is a certain distance between them in the vertical direction. The heater storage box 3-4 is used to house the heater, which requires a 12V power supply. The voltage input interface 3-3 is used to connect the positive and negative terminals of an external power supply, which then connects to the positive and negative taps (tap points) of the heater. The cable tray 3-5 is used to fix the heater storage box 3-4 to the bottom of the fixing plate 3-11 and also to support the heat transfer cable output from the heater.

[0041] The stationary handle 3-7 is fixedly connected to or integrally formed with the fixed plate 3-11. During the movement of the heating mechanism 3, the stationary handle 3-7 remains stationary. The rotating ring 3-10 surrounds the drive gear 3-6 and can drive the drive gear 3-6 to rotate. The moving handle 3-9 is fixedly connected to or integrally formed with the rotating ring 3-10. A compression spring 3-8 is provided between the moving handle 3-9 and the stationary handle 3-7.

[0042] Figure 6 The diagram shows the initial state of the adaptive diameter-changing clamp. The compression spring 3-8 pushes the handle 3-9 to rotate counter-clockwise, causing the driving gear 3-6 to rotate the driven gear 3-1. Each rotation of the driven gear 3-1, in turn, causes the copper plate 3-2 to rotate counter-clockwise, gradually reducing the diameter of the hollow area to a minimum of φ6. When the copper plate 3-2 is in contact with the surface of the transparent flexible tube (placed perpendicularly through the hollow area), it stops rotating, thus achieving the diameter-changing and adaptive adjustment functions.

[0043] As one feasible approach, the angle between the moving handle 3-9 and the stationary handle 3-7 forms an acute angle.

[0044] like Figure 7As shown, the heater includes a 0.3μF capacitor 3-12, a positive tap 3-13, a copper wire 3-14, a relay 3-15, a negative tap 3-16, and an IGBT component 3-17 (Insulated Gate Bipolar Transistor). The heater is located within an adaptive variable diameter clamp, i.e., the heater is placed inside the heater storage box 3-4. The heater uses a capacitive heating method, with three 0.3μF capacitors 3-12 connected in parallel. The collectors of the two IGBT components 3-17 are connected in parallel across the two ends of the capacitors (0.3μF capacitors 3-12), and the gates of the two IGBT components 3-17 are connected together. The emitters are connected to the negative tap 3-15. The other end of the 0.3μF capacitor 3-12 is connected to the copper wire 3-14, which is externally connected to the positive tap 3-13. After the copper wire generates heat, it directly transfers heat to the copper sheet through a heat transfer cable. The voltage input interface 3-3 is connected to a 12V battery, with the positive terminal of the battery connected to the positive tap 3-13 and the negative terminal of the power supply connected to the negative tap 3-16. Relay 3-15 receives the PWM signal output from controller 1. After the signal is boosted to 5V, it can be turned on and off by controlling relay 3-15, thereby controlling the start and stop of the heater and the temperature increment of the transparent hose.

[0045] During the adaptive diameter reduction process, it is equivalent to shrinking from a large circle to an irregularly shaped small circle. As long as the error caused by the irregularity is controlled within 20%, that is, the heating area of ​​the transparent flexible tube is above 80%, it can be guaranteed that the heating is basically uniform and hot spots will not be generated. The adaptive diameter reduction clamp is initially φ12, so this invention is applicable to transparent flexible tubes with φ6 to φ12.

[0046] After the device completes the wiring and clamps the transparent flexible tube, the transparent flexible tube temperature control logic is as follows: Figure 2 As shown. Power is supplied to controller 1 to begin collecting the surface temperature of the transparent tubing. The temperature value is updated in real time on the TFT LED LCD screen 1-1. Based on the set heating temperature range, when the temperature of the transparent tubing is below the upper limit of the heating temperature range, the heater will be activated to heat it, and LEDs 1-5 will light up; when the temperature reaches the upper limit of the temperature range, heating will stop, and LEDs 1-5 will turn off. During cooling, if the temperature of the transparent tubing is below the lower limit of the heating temperature range, heating will continue until the upper limit of the temperature range is reached. Details are as follows:

[0047] (1) Start heating, preset PWM duty cycle to 50%;

[0048] (2) Collect the temperature of the heated copper sheet;

[0049] (3) Check if there is a button. If there is, proceed to step (4); otherwise, proceed to step (5).

[0050] (4) Determine whether KEY1 key is pressed. If yes, proceed to step (6); otherwise, proceed to step (7).

[0051] (5) Calculate the temperature increment per second on the surface of the transparent hose and proceed to step (8);

[0052] (6) Reduce the heating temperature range by 5°C and return to step (1);

[0053] (7) Increase the heating temperature range by 5°C and return to step (1);

[0054] (8) Determine if the increment is greater than 5°C. If so, reduce the PWM duty cycle by 10%. Otherwise, return to step (1).

[0055] Heater status control logic as follows Figure 3 As shown. During heating, the copper sheet temperature is collected in real time to ensure controllability, and the temperature value is updated in real time on the TFT LED LCD screen 1-1. Maintenance personnel can adjust the heating temperature range (default 70-75℃). When the KEY1 key is pressed, the upper and lower limits of the heating temperature range decrease by 5℃ respectively; when the KEY2 key is pressed, the upper and lower limits of the heating temperature range increase by 5℃ respectively. If no key is pressed, the initial setting is maintained, and the range value is updated in real time on the TFT LED LCD screen 1-1. The preset PWM duty cycle is 50%, meaning that the heating time occupies 50% of a heating cycle. The temperature increment of the transparent hose surface is calculated, i.e., the temperature increase value per second. If it exceeds 5℃, the duty cycle is reduced by 10% to ensure controllable transparent hose temperature and prevent hotspot conditions, demonstrating the device's self-feedback function. Details are as follows:

[0056] (1) The controller is powered on and working;

[0057] (2) Collect the surface temperature of the transparent flexible tube;

[0058] (3) Determine whether the temperature of the transparent tube is lower than the upper limit of the heating temperature range. If yes, proceed to step (7); otherwise, proceed to step (4).

[0059] (4) Determine whether the temperature of the transparent tube exceeds the upper limit of the heating temperature range. If yes, proceed to step (5); otherwise, proceed to step (7).

[0060] (5) Stop heating, LED turns off;

[0061] (6) Determine whether the temperature of the transparent tube is lower than the upper limit of the heating temperature range. If yes, proceed to step (7); otherwise, return to step (5).

[0062] (7) Start heating, LED lights up.

[0063] The workflow of this invention is as follows:

[0064] The maintenance personnel hold the heating mechanism 3 and squeeze the stationary handle 3-7 and the moving handle 3-9 to compress the compression spring 3-8 to its maximum extent. At this time, the clamping diameter of the adaptive variable diameter clamp is at its maximum. Figure 4 As shown, the end of the transparent flexible tube to be assembled is then inserted into the adaptive reducing clamp.

[0065] Release the handle 3-9, and the compression spring 3-8 gradually extends. The elastic force causes the handle 3-9 to rotate counterclockwise, which in turn drives the driving gear 3-6 and the driven gear 3-1 to rotate counterclockwise. Under the action of the linkage mechanism (the driving gear drives the driven gear), all the copper plates 3-2 also rotate counterclockwise, causing the clamping diameter to adaptively shrink until the inner wall of the copper plates 3-2 clamps the transparent hose. After confirming a secure clamping, the maintenance personnel connect the 12V power connector to the voltage input interface 3-3. The heater begins to generate heat, which is transferred to the copper plates 3-2 through the heat transfer cable, and then transferred to the surface of the transparent hose, thus realizing the heating function of the transparent hose.

[0066] During the heating process, controller 1 follows control logic to heat the transparent flexible tube to the defined temperature range, and controls the on / off state of the heater based on the temperature increment per unit time to limit the power. After heating is complete, simply unplug the 12V power connector.

[0067] In summary, this invention designs a heating mechanism with self-feedback temperature control, adaptive diameter adjustment, and a human-machine interface. The self-feedback temperature control function is reflected in the controller's real-time acquisition of the surface temperatures of the heating copper sheet and the transparent flexible tube, which are then updated and displayed in real-time on the human-machine interface. The heating process uses a PWM signal to control the heater's start and stop, initially set at 50% PWM. The controller calculates the unit-time temperature increment of the transparent flexible tube surface; when the increment exceeds 5°C, the PWM duty cycle is reduced to ensure temperature control and prevent hot spots from forming on the transparent flexible tube. The human-machine interface also allows maintenance personnel to adjust the heating temperature range via button input, ensuring manual temperature control and protecting the transparent flexible tube from damage. This invention uses capacitors, IGBTs, and copper wire to construct the heating circuit, featuring controllable power, high thermal conductivity, and excellent ductility. The adaptive variable diameter clamp uses four horn-shaped copper plates, which maximizes the heat dissipation area and avoids heat accumulation. Under the action of the continuous mechanism of spring, moving handle, rotating ring, driving gear and driven gear, the heated copper plates can be rotated counterclockwise to achieve the variable diameter function. It is suitable for transparent hoses with diameters from φ6 to φ12.

[0068] This invention has a very rigorous and complete control logic, which is divided into transparent hose temperature control logic and heater state control logic (such as...). Figure 2 and Figure 3(As shown). In the transparent hose temperature control logic, the surface temperature of the transparent hose is collected in real time. According to the heating temperature range, when the temperature of the transparent hose is lower than the upper limit of the temperature range, the heater is started and the LED lights up; when the temperature reaches the upper limit of the temperature range, heating stops and the LED turns off; during the cooling period, if the temperature of the transparent hose is lower than the lower limit of the heating temperature range, heating continues until the upper limit of the temperature range is reached, thus ensuring that the temperature of the transparent hose remains within the normal temperature range and avoiding hot spots that could cause damage. In the heater status control logic, the temperature of the copper sheet is collected in real time to ensure controllability; the default heating temperature range is set to 70-75℃, and maintenance personnel can manually control the temperature range. The preset PWM duty cycle is 50%, ensuring that the initial temperature increases slowly and controllably. The increment of the transparent hose surface temperature is calculated, and if it exceeds 5℃, the duty cycle is reduced by 10% to ensure that the temperature of the transparent hose is controllable and to prevent hot spots from causing damage.

[0069] The transparent flexible tube temperature control logic provided by this invention is also applicable to other cylindrical objects subjected to heat, ensuring their temperature remains stable within the normal range. The adaptive diameter clamp proposed in this invention ensures both thermal conductivity and heat dissipation while maintaining a high heat transfer rate. Furthermore, its adaptive diameter adjustment function is stable and reliable, requires no manual intervention, and has strong generalization ability. This invention provides convenience for maintenance personnel, offering high safety, simple operation, and easy maintenance.

[0070] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A transparent flexible heating device for nuclear power plants with self-feedback temperature control and adaptive diameter variation, characterized in that, The device includes an electrically connected controller (1) and a heating mechanism (3). The heating mechanism (3) has a fixed plate (3-11) to which a stationary handle (3-7) is connected. A driving gear (3-6) and a set of driven gears (3-1) are mounted on the fixed plate (3-11). The driving gear (3-6) is an internal meshing gear, and the set of driven gears (3-1) is an external meshing gear that meshes with the driving gear (3-6). Each driven gear (3-1) is connected to a copper sheet (3-2) for rotating in the same direction. The heater heats the copper sheet (3-2). A rotating ring (3-10) is provided outside the driving gear (3-6). A movable handle (3-9) is connected to the rotating ring (3-10), and a compression spring (3-8) is provided between the movable handle (3-9) and the stationary handle (3-7). The heater includes a 0.3μF capacitor (3-12), a positive tap (3-13), a copper wire (3-14), a relay (3-15), a negative tap (3-16), and an IGBT component (3-17). The three 0.3μF capacitors (3-12) are connected in parallel, the collectors of the two IGBT components (3-17) are connected in parallel across the two ends of the capacitor, the gates of the two IGBT components (3-17) are connected, and the emitter is connected to the negative tap (3-16).

2. The transparent flexible heating device for self-feedback temperature control and adaptive diameter variation in nuclear power plants according to claim 1, characterized in that, The heating mechanism (3) has a heater storage box (3-4), and the heater is disposed in the heater storage box (3-4).

3. The transparent flexible tube heating device for self-feedback temperature control and adaptive diameter variation in nuclear power plants according to claim 2, characterized in that, The heater storage box (3-4) is provided with a voltage input interface (3-3) for connecting the positive and negative terminals of an external power supply, which in turn connects to the positive and negative terminals of the heater.

4. The transparent flexible heating device for self-feedback temperature control and adaptive diameter variation in nuclear power plants according to claim 2 or 3, characterized in that, The heater storage box (3-4) and the fixing plate (3-11) are connected by a bridge (3-5).

5. The transparent flexible heating device for self-feedback temperature control and adaptive diameter variation in nuclear power plants according to claim 1, characterized in that, The number of the driven gears (3-1) in a set is 4, and they are evenly distributed circumferentially at equal angles.

6. The transparent flexible heating device for self-feedback temperature control and adaptive diameter variation in nuclear power plants according to claim 1 or 5, characterized in that, The copper sheet (3-2) is horn-shaped and its bottom is connected to the driven gear (3-1). The inner arc of the copper sheet (3-2) clamps and heats the transparent flexible tube.

7. The transparent flexible heating device for self-feedback temperature control and adaptive diameter variation in nuclear power plants according to claim 1, characterized in that, Each of the copper plates (3-2) is connected and fastened to the driven gear (3-1) at the corresponding position through a copper post and a screw, so that when the driven gear (3-1) rotates, it drives the copper plate (3-2) to rotate in the same direction.

8. The transparent flexible heating device for self-feedback temperature control and adaptive diameter variation in nuclear power plants according to claim 1, characterized in that, The controller (1) includes an electrically connected TFTLCD screen (1-1), a power interface (1-2), an STM32 chip (1-3), buttons (1-4), LEDs (1-5), a heater temperature acquisition interface (1-6), a transparent hose temperature acquisition interface (1-7), and a GPIO interface (1-8).

9. The transparent flexible heating device for self-feedback temperature control and adaptive diameter variation in nuclear power plants according to claim 1, characterized in that, The moving handle (3-9) and the stationary handle (3-7) form an acute angle.

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