Method for measuring temperature in carbon fiber oxidation furnace

Abstract

The application discloses a kind of carbon fiber oxidation furnace temperature determination methods, comprising: according to the transverse and longitudinal distribution of carbon fiber in oxidation furnace Set up multiple temperature measurement lines, each The temperature measurement line is spaced apart and provided with a plurality of temperature measurement points, the temperature of the plurality of temperature measurement points on the multiple test lines is tested using a temperature measurement tool, to realize the temperature determination of the carbon fiber in The oxidation furnace. Above through the setting of temperature measurement point in oxidation furnace and the synchronous temperature measurement of multiple points, effectively solve the existing temperature measurement mode not fully covered, point drift, poor synchronism, low precision and other problems, for carbon fiber, especially large diameter medium model large tow carbon fiber pre-oxidation process optimization and skin-core structure control Provide reliable temperature field data support, while improving the mechanical properties of the product, improve the safety and efficiency of production process.

Description

Technical Field

[0001] This invention relates to the field of oxidation furnace temperature measurement technology, and more specifically, to a method for measuring the temperature inside a carbon fiber oxidation furnace. Background Technology

[0002] In the production process of carbon fiber, especially large-diameter medium-modulus large-tow carbon fiber 48K, the pre-oxidation process is a key step that determines the quality stability, mechanical properties and batch consistency of carbon fiber. It directly affects the degree of pre-oxidation of PAN precursor, structural uniformity and the stability of subsequent carbonization processes, and thus determines the core performance indicators such as core-sheath structure control and modulus consistency of large-tow carbon fiber.

[0003] In the pre-oxidation process of large-diameter medium-sized model large-tow carbon fiber, the requirements for the uniformity of the temperature field in the oxidation furnace are more stringent. It is necessary to strictly control the temperature at the set test temperature of 240℃ with an accuracy of ±2℃. If the temperature deviation is too large, it will lead to uneven pre-oxidation inside the tow, which can easily cause problems such as obvious core-sheath structure and discrete mechanical properties.

[0004] Existing temperature measurement methods for oxidation furnaces are mostly single-point or localized, which suffer from problems such as incomplete coverage, sparse measurement points, asynchronous horizontal and vertical temperature measurement, inaccurate probe positioning, large deviations in temperature measurement data, and inability to achieve full-furnace temperature field monitoring without blind spots. At the same time, the temperature measuring tools are not securely fixed and the tape is prone to high-temperature failure, which further leads to difficulty in temperature measurement repeatability and low accuracy. This makes it difficult to meet the precise temperature control requirements for the pre-oxidation of large-diameter medium-mold large-tow carbon fibers, and seriously restricts the quality stability and industrial production efficiency of large-diameter medium-mold large-tow carbon fibers. Summary of the Invention

[0005] The purpose of this invention is to overcome the problems existing in the prior art and provide a method for measuring the temperature inside a carbon fiber oxidation furnace, so as to solve the technical problems in the prior art such as low risk identification efficiency, insufficient linkage between risks and hidden dangers, inaccurate information push, delayed dynamic response, and high threshold for employee participation.

[0006] The technical problem solved by this invention is achieved by the following technical solution.

[0007] The present invention provides a method for measuring the temperature inside a carbon fiber oxidation furnace, comprising: setting up multiple temperature measuring lines according to the transverse and longitudinal distribution of carbon fibers in the oxidation furnace, wherein each temperature measuring line is provided with a number of temperature measuring points at intervals, and using a temperature measuring tool to test the temperature of the number of temperature measuring points on the multiple test lines, thereby realizing the temperature measurement of the carbon fibers inside the oxidation furnace.

[0008] The present invention has the following beneficial effects: This invention provides a method for measuring the temperature inside a carbon fiber oxidation furnace, which can achieve temperature measurement across the entire horizontal and vertical area of ​​the oxidation furnace without dead angles. This ensures accurate temperature measurement points, comprehensive data acquisition, strong synchronization, and high stability, meeting the precise temperature control requirements for setting the test temperature and accuracy of the oxidation furnace. It provides reliable data support for optimizing the pre-oxidation process, controlling the core-sheath structure, and ensuring the quality stability of carbon fibers, especially large-diameter medium-mold large-tow carbon fibers. Attached Figure Description

[0009] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a distribution diagram of temperature measuring points on the furnace body of the oxidation furnace of the present invention; Figure 2 A schematic diagram showing the markings for the temperature measurement positions at the furnace opening of the oxidation furnace. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall apply. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0012] The following is a detailed description of a method for measuring the temperature inside a carbon fiber oxidation furnace provided by an embodiment of the present invention.

[0013] The present invention provides a method for measuring the temperature inside a carbon fiber oxidation furnace, comprising: setting up multiple temperature measuring lines according to the transverse and longitudinal distribution of carbon fibers in the oxidation furnace, wherein each temperature measuring line is provided with a number of temperature measuring points at intervals, and using a temperature measuring tool to test the temperature of the number of temperature measuring points on the multiple test lines, thereby realizing the temperature measurement of the carbon fibers inside the oxidation furnace.

[0014] Before use or when restarting a carbon fiber oxidation furnace, the temperature inside the furnace fluctuates significantly, leading to uneven pre-oxidation of the fiber bundles and problems such as noticeable core-sheath structure and inconsistent mechanical properties. Existing temperature measurement methods for oxidation furnaces are mostly single-point or localized, failing to achieve comprehensive monitoring of the entire furnace temperature field without blind spots.

[0015] To overcome the aforementioned problems in existing technologies and meet the precise temperature control requirements for carbon fiber pre-oxidation, this invention provides a method for measuring temperature inside a carbon fiber oxidation furnace. Multiple temperature measurement lines are set according to the transverse and longitudinal distribution of carbon fibers within the oxidation furnace, and multiple temperature measurement points are set on these lines. This lays the foundation for comprehensive monitoring of the entire furnace temperature field without blind spots. Then, temperature measurement tools are used to test the temperature at several of the aforementioned measurement points on the multiple test lines, achieving comprehensive, all-around, and blind-spot-free temperature measurement of the entire oxidation furnace in both transverse and longitudinal directions. This ensures accurate temperature measurement points, comprehensive data acquisition, strong synchronization, and high stability, meeting the precise temperature control requirements for setting the test temperature and accuracy of the oxidation furnace. This provides reliable data support for optimizing the pre-oxidation process, controlling the core-sheath structure, and ensuring stable quality of carbon fibers, especially large-diameter medium-mold large-tow carbon fibers.

[0016] In some optional embodiments, the temperature measuring lines are configured as follows: several longitudinal temperature measuring points are divided according to the longitudinal distribution height of the carbon fibers in the oxidation furnace, and several transverse temperature measuring points are divided along the transverse direction corresponding to the coverage range of the carbon fiber bundle width. A line connecting several longitudinal temperature measuring points at the same height constitutes one longitudinal temperature measuring line, and a line connecting several transverse temperature measuring points at the same width constitutes one transverse temperature measuring line. This invention sets up multiple temperature measuring lines according to the longitudinal and transverse distribution of carbon fibers in the oxidation furnace. Each temperature measuring line has several temperature measuring points spaced apart, achieving full coverage of temperature measuring points in both the transverse and longitudinal directions of the oxidation furnace without blind spots. This overcomes problems such as incomplete temperature measuring point coverage, sparse temperature measuring points, large temperature data deviations, and the inability to achieve full-coverage, blind-spot-free monitoring of the entire furnace temperature field, laying the foundation for achieving full coverage and blind-spot-free monitoring of the entire furnace temperature field.

[0017] In some alternative implementations, the temperature measuring tool includes: a temperature measuring rope, high-temperature resistant tape for fixing the temperature measuring rope, an infrared thermometer for verifying the temperature of the area where the high-temperature resistant tape is pasted, and a thermocouple temperature recorder for testing the temperature of each temperature measuring point.

[0018] In some alternative embodiments, the temperature measuring rope includes a steel wire rope, a thermocouple wire, and a temperature measuring probe. The fabrication of the temperature measuring rope includes: binding the steel wire rope and the thermocouple wire in parallel, wrapping the surface with a high-temperature resistant insulating layer, and connecting a temperature measuring probe to the thermocouple wire at each temperature measuring point for transmitting temperature signals.

[0019] In some alternative embodiments, the fabrication of the temperature measuring rope includes: preparing multiple steel wire ropes and thermocouple wires; taking one of the steel wire ropes as a guide rail; fixing the end of the steel wire rope to the roller at the tail of the oxidation furnace and locking it with a stainless steel buckle; binding the steel wire rope and the thermocouple temperature measuring wire in parallel; wrapping a high-temperature resistant insulating layer on the surface at the temperature measuring point to mark the position number; and connecting a temperature measuring probe to the thermocouple wire at each temperature measuring point to transmit the temperature signal.

[0020] In some optional embodiments, high-temperature resistant tape is wound and fixed radially along the temperature measuring rope. Before fixing, the temperature of the area where the high-temperature resistant tape is applied is checked with an infrared thermometer to confirm that there is no local overheating that could cause the high-temperature resistant tape to fail. After fixing, the straightness of the temperature measuring rope is checked, ensuring there is no twisting or bending to prevent probe misalignment that could lead to temperature measurement deviation. Insecure fixing of the temperature measuring tool and easy high-temperature failure of the tape will result in difficulty in temperature measurement repeatability and low accuracy, making it difficult to meet the precise temperature control requirements of carbon fiber pre-oxidation, thus restricting the quality stability and industrial production efficiency of carbon fibers. Therefore, in this invention, high-temperature resistant tape is used to fix the temperature measuring rope to prevent probe misalignment that could lead to temperature measurement deviation, ensuring the accuracy of temperature monitoring in each area of ​​the large-tow carbon fiber pre-oxidation process.

[0021] In some optional embodiments, the method of testing the temperature of several temperature measurement points on the multiple test lines using temperature measuring tools includes: deploying multiple workers at the furnace opening and tail of the oxidation furnace to perform rope-pulling temperature measurement; after simultaneously conducting rope-pulling temperature measurement on several longitudinal temperature measurement lines, the temperature measurement operations at different transverse temperature measurement points are completed sequentially, thereby achieving synchronous monitoring of the temperature of the entire pre-oxidation area of ​​the carbon fiber. Asynchronous transverse and longitudinal temperature measurement within the oxidation furnace will lead to inaccurate temperature measurement within the furnace, affecting the uniformity of carbon fiber oxidation within the furnace. Therefore, this invention performs synchronous transverse and longitudinal temperature measurement operations to achieve synchronous monitoring of the temperature of the entire pre-oxidation area of ​​large-tow carbon fiber, ensuring accurate and reliable temperature measurement data.

[0022] In some alternative implementations, during the process of pulling the rope to measure temperature, the staff controls the pulling force and speed to keep the temperature measuring rope straight and without twisting, ensuring that the temperature measuring probe is accurately aligned with each temperature measuring point.

[0023] In some optional implementations, the method further includes: if, during the temperature measurement process, it is found that the fixing tape at the temperature measurement point has become loose or shifted, immediately stop pulling the wire, pull out the temperature measurement rope, recheck the temperature of the pasted area, reinforce the high-temperature resistant tape, and fix it again to ensure that the point is firm and to avoid affecting the temperature control of carbon fiber pre-oxidation due to temperature measurement deviation.

[0024] In some optional implementations, the method further includes: a portable thermocouple temperature recorder that records the temperature value of each temperature measurement point in real time, and checks the temperature data point by point to ensure that the temperature measurement data is accurate and reliable.

[0025] The present invention will be further described below with reference to embodiments.

[0026] This invention provides a method for measuring the temperature inside a carbon fiber oxidation furnace, comprising the following steps: (1) Layout of temperature measurement points The oxidation furnace is divided and marked with multiple points along the horizontal direction, corresponding to the coverage range of the fiber width during the pre-oxidation of large-tow carbon fibers in the large-diameter medium-sized model. It is also divided into low, medium, and high points along the vertical direction, corresponding to three independent temperature measurement lines, which are adapted to the vertical distribution height of the large-tow carbon fibers in the furnace. The three points in the vertical direction are measured simultaneously. Each temperature measurement line is arranged with 30 temperature points along the length of the furnace. The standard for the temperature point arrangement is: the spacing between the horizontal temperature measurement points is 50cm, and then the next set of temperature points is connected with a spacing of 90cm, and so on, to ensure that the temperature measurement coverage in the horizontal, vertical, and length directions of the furnace is comprehensive and the data is collected in a complete manner, so as to accurately capture the temperature changes throughout the pre-oxidation process of large-tow carbon fibers.

[0027] (2) Preparation of temperature measuring tools The tools required for temperature measurement include steel wire rope, thermocouple wire, high-temperature resistant insulation layer, high-temperature resistant tape, infrared thermometer, and portable thermocouple temperature recorder. One of the steel wire ropes is used as a guide rail, with its end fixed to a roller at the furnace tail and locked with a stainless steel clip. Three guide rails are distributed at low, medium, and high speeds. A test line is then fabricated, with the steel wire rope and thermocouple wire bonded and bundled together in parallel. A high-temperature resistant insulating layer is wrapped around the surface at the temperature measurement points to mark the position number, ensuring stable heat transfer and preventing slippage. This is suitable for the temperature conditions of large-diameter medium-sized model large-tow carbon fiber pre-oxidation. The thermocouple wire is connected to the temperature probe to transmit temperature signals, ensuring real-time and accurate temperature data and providing timely support for adjusting the large-tow carbon fiber pre-oxidation process.

[0028] (3) Fixed temperature measurement points Mark lines on the furnace head to divide and mark multiple points. Fix the temperature measuring ropes (steel wire rope + thermocouple wire) corresponding to the three points in the vertical direction (low, medium, and high) according to the horizontal temperature measuring points to ensure that the temperature measuring points accurately correspond to the distribution position of the large-diameter medium-sized model large-tow carbon fiber in the furnace. Before fixing, use an infrared thermometer to check the temperature of the area where the tape is pasted to confirm that there is no local overheating that would cause the tape to fail, and to avoid affecting the temperature measurement accuracy due to loose fixing, which would in turn affect the pre-oxidation quality of the large-tow carbon fiber.

[0029] High-temperature resistant tape is used to fix the temperature measuring rope radially to ensure zero displacement and zero drift during the synchronous temperature measurement of the three temperature measuring points. After fixing, the straightness of the temperature measuring rope is checked to ensure that there is no twisting or bending, so as to prevent the probe from tilting and causing temperature measurement deviation, and to ensure the accuracy of temperature monitoring in each area of ​​the pre-oxidation of large-tow carbon fiber.

[0030] (4) Synchronous wire temperature measurement Three staff members are assigned to each oxidation furnace opening and tail, respectively, to the low, medium, and high temperature measurement lines. This is to meet the high-efficiency industrial production needs of pre-oxidation of large-diameter medium-sized carbon fiber. The staff members are focused throughout the process, controlling the tension and speed of the wire rope, keeping the steel wire rope straight and without twisting, and ensuring that the temperature probe is accurately aligned with each temperature point. This avoids inaccurate temperature data due to wire rope deviation, which would prevent accurate control of the pre-oxidation degree of the large-tow carbon fiber. The wire rope temperature measurement is carried out simultaneously at the three longitudinal points, and the temperature measurement work at the transverse temperature measurement points is completed in sequence, realizing synchronous monitoring of the temperature of the entire pre-oxidation area of ​​the large-tow carbon fiber.

[0031] (5) Abnormal handling and accurate temperature measurement During the temperature measurement process, after measuring the temperature at points A and B, if the fixing tape at these points is found to be loose or shifted, the pulling of the wire is immediately stopped, the temperature measuring rope is pulled out, the temperature of the pasted area is rechecked, and the high-temperature resistant tape is reinforced before fixing it again to ensure that the points are firmly secured. This avoids the temperature control of the pre-oxidation of large-tow carbon fiber in the large-diameter medium-sized model being affected by temperature measurement deviations. The furnace temperature is kept stable throughout the process to effectively avoid problems such as insufficient or excessive pre-oxidation of the carbon fiber. Temperature data is checked point by point, and the temperature value of each temperature point is recorded in real time using a portable thermocouple temperature recorder to ensure accurate and reliable temperature measurement data, providing data support for the optimization of pre-oxidation process parameters for large-tow carbon fiber.

[0032] Example 1 A method for measuring the temperature inside a carbon fiber oxidation furnace is applied to a 48K large-tow carbon fiber carbonization process line. The process line is equipped with three oxidation furnaces, each divided into five temperature zones along its length. The target test temperature is 240℃±2℃, which is suitable for the pre-oxidation process requirements of 48K large-tow carbon fiber. The steps are as follows: (1) Site layout, see Figure 1-2 The oxidation furnace has five horizontal points (A, B, C, D, and E) corresponding to the width coverage of the 48K large filament bundle. It also has three vertical temperature measurement lines (low, medium, and high) corresponding to the vertical distribution height of the 48K large filament bundle within the furnace. Each line has 30 temperature points, with the first six points spaced 50cm apart, and subsequent six points spaced 90cm apart, ensuring complete coverage of the entire furnace and accurately capturing temperature changes throughout the pre-oxidation process of the 48K large filament bundle.

[0033] (2) Tool preparation: Steel wire rope is used as a guide rail, with a thermocouple probe fixed at the end. The surface is wrapped with a high-temperature resistant insulation layer to adapt to high-temperature working conditions of 240℃; equipped with thermocouple wire, high-temperature resistant tape, infrared thermometer, and portable temperature recorder to ensure accurate transmission of temperature measurement data.

[0034] (3) Fixing the points: The infrared thermometer checks the temperature of the pasting area to confirm that there is no local overheating. The high-temperature resistant tape is radially wrapped in both directions to fix the three temperature measuring ropes, ensuring no displacement or drift, and ensuring that the temperature measuring points correspond precisely to the distribution positions of the 48K large wire bundle.

[0035] (4) Synchronous temperature measurement: The furnace tail staff is responsible for pulling the middle line, with a uniform and stable speed and the steel wire rope straight. The probe is accurately aimed at each temperature point. This line corresponds to the core distribution area of ​​the 48K large filament bundle. The temperature measurement of points A, B, C, D and E is completed simultaneously at three longitudinal points to achieve synchronous temperature measurement of the entire area of ​​the 48K large filament bundle pre-oxidation.

[0036] (5) Abnormal handling: After temperature measurement at points A and B, the tape became loose. The temperature measuring rope was pulled out, the temperature was checked, and then it was reinforced again to avoid the temperature measurement deviation affecting the pre-oxidation quality of the 48K large filament bundle. Temperature measurement at all points was then completed.

[0037] As can be seen from the above, the solution provided by this invention has the following advantages: (1) Comprehensive temperature measurement coverage without blind spots, adapting to the needs of large tow: five horizontal points, three vertical lines, and 30 temperature points along the length direction, arranged in a cyclical pattern at 50cm and 90cm intervals, accurately covering the distribution area of ​​large-diameter medium-sized model large tow carbon fibers in the furnace, realizing full-area temperature field monitoring of the oxidation furnace, comprehensive data collection, and providing comprehensive data support for the optimization of large tow pre-oxidation process.

[0038] (2) Accurate temperature measurement and high stability ensure the quality of large fiber bundles: Simultaneous temperature measurement at three longitudinal points ensures that the steel wire rope is straight and without twisting during the wire pulling process, and the probe is accurately positioned; the high-temperature resistant insulation layer and bidirectional winding high-temperature resistant tape fixation prevent high-temperature failure and point drift, ensuring accurate temperature control of 240℃±2℃, effectively avoiding problems such as uneven pre-oxidation and obvious core-skin structure in large fiber bundles.

[0039] (3) Timely handling of anomalies and reliable data enhance industrial stability: Real-time inspection of tape fixation status, immediate reinforcement after loosening or displacement, infrared thermometer to verify temperature, and point-by-point data verification effectively avoid temperature measurement deviation. The data has good repeatability and high reliability, ensuring the quality stability of industrial production of large-diameter medium-sized model large-tow carbon fiber.

[0040] (4) Adapting to industrialization needs and fitting the production scenario of large tow: Three oxidation furnaces and simultaneous temperature measurement in multiple temperature zones, with clear division of labor and standardized operation, are adapted to the industrialization preparation rhythm of large-diameter medium-sized model large tow carbon fiber 48K, providing a guarantee for the stability of pre-oxidation process, the improvement of tow performance and large-scale production.

[0041] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for measuring the temperature inside a carbon fiber oxidation furnace, characterized in that, include: Multiple temperature measuring lines are set according to the longitudinal and transverse distribution of carbon fibers in the oxidation furnace. Each temperature measuring line has several temperature measuring points spaced apart. The temperature of several temperature measuring points on the multiple test lines is tested using a temperature measuring tool to realize the temperature measurement of the carbon fibers in the oxidation furnace.

2. The determination method according to claim 1, characterized in that, The temperature measurement circuit is set up by dividing several longitudinal temperature measurement points according to the longitudinal distribution height of carbon fibers in the oxidation furnace, and dividing several transverse temperature measurement points along the transverse direction corresponding to the coverage range of the carbon fiber bundle width. The line connecting several longitudinal temperature measurement points at the same height constitutes one longitudinal temperature measurement circuit, and the line connecting several transverse temperature measurement points at the same width constitutes one transverse temperature measurement circuit.

3. The determination method according to claim 1, characterized in that, The temperature measurement tools include: a temperature measuring rope, high-temperature resistant tape for fixing the temperature measuring rope, an infrared thermometer for verifying the temperature of the area where the high-temperature resistant tape is pasted, and a thermocouple temperature recorder for testing the temperature of each temperature measuring point.

4. The determination method according to claim 3, characterized in that, The temperature measuring rope includes a steel wire rope, thermocouple wires, and a temperature measuring probe. The manufacturing process of the temperature measuring rope includes: binding the steel wire rope and thermocouple wires in parallel, wrapping the surface with a high-temperature resistant insulating layer, and connecting a temperature measuring probe to the thermocouple wire at each temperature measuring point for transmitting temperature signals.

5. The determination method according to claim 4, characterized in that, The fabrication of the temperature measuring rope includes: preparing multiple steel wire ropes and thermocouple wires; taking one of the steel wire ropes as a guide rail; fixing the end of the steel wire rope to the roller at the tail of the oxidation furnace and locking it with a stainless steel buckle; binding the steel wire rope and thermocouple wire in parallel; wrapping the surface at the temperature measuring point with a high-temperature resistant insulating layer to mark the position number; and connecting a temperature measuring probe to the thermocouple wire at each temperature measuring point to transmit the temperature signal.

6. The determination method according to claim 3, characterized in that, The high-temperature resistant tape is wound and fixed radially along the temperature measuring rope. Before fixing, the temperature of the area where the high-temperature resistant tape is pasted is checked with an infrared thermometer to confirm that there is no local overheating that could cause the high-temperature resistant tape to fail. After fixing, the straightness of the temperature measuring rope is checked, and there is no twisting or bending to prevent the probe from being tilted and causing temperature measurement deviation.

7. The determination method according to claim 1, characterized in that, The method for testing the temperature of several temperature measurement points on the multiple test lines using temperature measuring tools includes: deploying multiple workers at the furnace mouth and furnace tail of the oxidation furnace to perform rope temperature measurement; after rope temperature measurement is carried out simultaneously on several longitudinal temperature measurement lines, the temperature measurement work of different transverse temperature measurement points is completed in sequence to achieve synchronous monitoring of the temperature of the entire area of ​​carbon fiber pre-oxidation.

8. The determination method according to claim 7, characterized in that, During the process of pulling the rope to measure temperature, the staff controlled the pulling force and speed, kept the temperature measuring rope straight and without twisting, and ensured that the temperature measuring probe was accurately aligned with each temperature measuring point.

9. The determination method according to claim 8, characterized in that, Also includes: During temperature measurement, if the fixing tape at the temperature measurement point is found to be loose or displaced, immediately stop pulling the wire, pull out the temperature measurement rope, recheck the temperature of the pasted area, reinforce the high-temperature resistant tape, and fix it again to ensure that the point is firm and to avoid affecting the temperature control of carbon fiber pre-oxidation due to temperature measurement deviation.

10. The determination method according to claim 8, characterized in that, Also includes: The portable thermocouple temperature recorder records the temperature value of each temperature measurement point in real time, and verifies the temperature data point by point to ensure that the temperature measurement data is accurate and reliable.

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