Fiber pre-oxidation adjusting method and adjusting device

Abstract

The invention relates to a fiber pre-oxidation adjusting method and an adjusting device. The pre-oxidation adjusting method comprises the following steps: acquiring a first color parameter before fiber is subjected to pre-oxidation treatment; obtaining a second color parameter in the pre-oxidation treatment process of the fiber; and adjusting a temperature parameter in the pre-oxidation treatment process according to a color difference value of the first color parameter and the second color parameter. According to the fiber pre-oxidation adjusting method, the current pre-oxidation degree can be obtained according to the color difference value before and after pre-oxidation, the temperature in the pre-oxidation process is adjusted, real-time adjustment of the fiber pre-oxidation degree is achieved, and then the pre-oxidation effect is accurately controlled.

Description

Technical Field

[0001] The present disclosure relates to the technical field of fiber processing, and in particular to a fiber pre-oxidation regulation method and a regulation device. Background Art

[0002] Polyacrylonitrile ([-CH2-CH(CN)-]n) based carbon fiber has excellent properties, including high specific strength, heat resistance and corrosion resistance, etc. It has attracted widespread attention in scientific research and industrial production and is known as the most valuable new material in the new century.

[0003] The preparation of PAN-based carbon fibers requires three main processes: precursor forming, pre-oxidation, and carbonization. The pre-oxidation process is time-consuming and cumbersome, and has an important impact on the mechanical properties of carbon fibers. The suitability of the initial pre-oxidation process will directly affect the pre-oxidation effect and even the mechanical properties of carbon fibers. Too high or too low an initial pre-oxidation degree will directly affect the transformation of the fiber structure, and then affect the subsequent carbonization process. The final carbon fibers will also have structural defects due to inappropriate initial pre-oxidation processes, affecting the quality of the carbon fibers.

[0004] In current large-scale production, the degree of initial pre-oxidation is mostly determined by the pre-oxidation filament density method and the skin-core method. All detection methods require offline verification, and their detection results usually have a certain lag. The degree of initial pre-oxidation is difficult to achieve online real-time detection and automatic adjustment. Summary of the invention

[0005] In order to overcome the problems existing in the related art, the present disclosure provides a fiber pre-oxidation adjustment method and an adjustment device, which can achieve real-time adjustment of the fiber pre-oxidation degree and thus accurately control the pre-oxidation effect.

[0006] According to an embodiment of the present disclosure, a fiber pre-oxidation adjustment method is provided, comprising:

[0007] Acquiring a first color parameter of the fiber before pre-oxidation treatment;

[0008] Obtaining a second color parameter of the fiber during the pre-oxidation treatment;

[0009] The temperature parameter in the pre-oxidation process is adjusted according to the color difference between the first color parameter and the second color parameter.

[0010] In some exemplary embodiments of the present disclosure, the step of obtaining the first color parameter of the fiber before the pre-oxidation treatment comprises:

[0011] Obtaining the brightness value, red-green value, and blue-yellow value of the fiber before the pre-oxidation treatment as the first color parameter;

[0012] The step of obtaining a second color parameter of the fiber during the pre-oxidation treatment comprises:

[0013] The brightness value, red-green value, and blue-yellow value of the fiber during the pre-oxidation treatment are obtained as the second color parameter.

[0014] In some exemplary embodiments of the present disclosure, the following are included:

[0015] Obtaining a difference between a brightness value of the first color parameter and a brightness value of the second color parameter as a brightness difference value, obtaining a difference between a red-green value of the first color parameter and a red-green value of the second color parameter as a red-green difference value, and obtaining a difference between a blue-yellow value of the first color parameter and a blue-yellow value of the second color parameter as a blue-yellow difference value;

[0016] The square root of the sum of the squares of the brightness difference value, the red-green difference value and the blue-yellow difference value is calculated as the color difference value.

[0017] In some exemplary embodiments of the present disclosure, adjusting the temperature parameter in the pre-oxidation process according to the color difference between the first color parameter and the second color parameter includes:

[0018] When the color difference value is greater than a first preset value, lowering the temperature during the pre-oxidation treatment process;

[0019] When the color difference value is less than a second preset value, increasing the temperature in the pre-oxidation process;

[0020] The second preset value is smaller than the first preset value.

[0021] In some exemplary embodiments of the present disclosure,

[0022] When the color difference value is greater than the first preset value, the temperature reduction value during the pre-oxidation treatment is a, the difference between the color difference value and the first preset value is b, and a is positively correlated with b; and / or

[0023] When the color difference value is less than the second preset value, the temperature reduction value in the pre-oxidation process is m, the difference between the color difference value and the second preset value is n, and m is positively correlated with n.

[0024] In some exemplary embodiments of the present disclosure,

[0025] When the color difference value is greater than a third preset value, a first reminder signal is issued, and the third preset value is greater than the first preset value;

[0026] When the color difference value is less than a fourth preset value, a second reminder signal is issued, and the fourth preset value is less than the second preset value.

[0027] In some exemplary embodiments of the present disclosure, when the color difference value is greater than the first preset value and less than the fifth preset value, the temperature during the pre-oxidation treatment is lowered by 0.3° C.-0.7° C.;

[0028] When the color difference value is greater than the fifth preset value and less than the third preset value, the temperature in the pre-oxidation process is lowered by 0.8° C. to 1.2° C.;

[0029] The fifth preset value is greater than the first preset value and less than the third preset value.

[0030] In some exemplary embodiments of the present disclosure, when the color difference value is less than the second preset value and greater than the sixth preset value, the temperature in the pre-oxidation process is increased by 0.3° C.-0.7° C.;

[0031] When the color difference value is less than the sixth preset value and greater than the fourth preset value, the temperature in the pre-oxidation process is increased by 0.8° C.-1.2° C.;

[0032] The sixth preset value is smaller than the second preset value and larger than the fourth preset value.

[0033] In some exemplary embodiments of the present disclosure,

[0034] The first preset value is 72.4-73.4, and the second preset value is 68.5-69.5;

[0035] The third preset value is 74.5-75.5, and the fourth preset value is 65-66.

[0036] According to another embodiment of the present disclosure, a fiber pre-oxidation regulating device is provided, comprising:

[0037] Pre-oxidation furnace, in which the fiber is pre-oxidized:

[0038] A color difference detection device, comprising a non-contact colorimeter and a detection track, wherein the number of the color difference detection devices is at least two, one of the at least two color difference detection devices is configured at the fiber entrance of the pre-oxidation furnace to reciprocate for detection, and the other of the at least two color difference detection devices is configured at the fiber exit of the pre-oxidation furnace to reciprocate for detection;

[0039] A temperature control device is arranged inside the pre-oxidation furnace, and is used to detect and adjust the internal temperature of the pre-oxidation furnace;

[0040] The control device is electrically connected to the color difference detection device and the temperature control device respectively. The control device receives the electrical signal of the color difference detection device, calculates the color difference value of the fiber before and after pre-oxidation, and controls the temperature control device to adjust the internal temperature of the pre-oxidation furnace according to the color difference value.

[0041] The above-mentioned fiber pre-oxidation adjustment method and adjustment device disclosed in the present invention have the following beneficial effects: the present application first determines the current pre-oxidation degree of the fiber according to the color difference value between the first color parameter and the second color parameter, and then adjusts the temperature parameter in the pre-oxidation process according to the current pre-oxidation degree, and adjusts the pre-oxidation process to the desired degree. Since the acquisition of the first color parameter and the second color parameter is fast and intuitive, the color change can be captured in real time through the optical system to provide instant feedback, and the pre-oxidation degree can be quickly determined according to the size of the color difference value without complicated calculations, so the present application can adjust the temperature in real time according to the color difference value and then adjust the pre-oxidation degree in real time, which helps to accurately and quickly control the pre-oxidation effect and improve product quality and production efficiency.

[0042] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0044] Figure 1 The figure is a flow chart of a fiber pre-oxidation adjustment method according to an exemplary embodiment.

[0045] Figure 2 It is a schematic diagram of a control flow according to an exemplary embodiment.

[0046] Figure 3 1 is a diagram showing the corresponding relationship between the color difference value, the pre-oxidation parameter, and the carbon fiber performance according to an exemplary embodiment.

[0047] Figure 4 is a corresponding relationship between color difference values ​​and adjustment strategies shown according to an exemplary embodiment.

[0048] Figure 5 is a schematic diagram showing fibers before entering a pre-oxidation furnace according to an exemplary embodiment.

[0049] Figure 6 is a schematic diagram showing the interior of a pre-oxidation furnace according to an exemplary embodiment. DETAILED DESCRIPTION

[0050] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0051] If there are terms involving directional indications or positional relationships in the embodiments of the present application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationship, movement, etc. between the components under a certain specific posture (as shown in the accompanying drawings); if the specific posture changes, the directional indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. involved in the embodiments of the present application are only used for the purpose of convenience of description and cannot be understood as indicating or implying relative importance.

[0052] Please refer to Figure 1 , Figure 1 The present application provides a method for adjusting fiber pre-oxidation, comprising:

[0053] S1, obtaining a first color parameter of the fiber before pre-oxidation treatment;

[0054] S2, obtaining a second color parameter of the fiber during pre-oxidation treatment;

[0055] S3. Adjusting a temperature parameter in the pre-oxidation process according to the color difference between the first color parameter and the second color parameter.

[0056] Taking carbon fiber as an example, during the pre-oxidation stage of the carbon fiber preparation process, chromogenic genes are generated during the structural transformation process, and the color of the carbon fiber bundle changes significantly from light to dark, that is, from white to black. In the initial pre-oxidation stage, the color change of the carbon fiber bundle is particularly obvious. Under different initial pre-oxidation degrees, the color of the fiber during the pre-oxidation process is also different. Therefore, the color change of the fiber can be used to determine the extent of the pre-oxidation process.

[0057] In step S1, the first color parameter of the fiber before pre-oxidation is obtained, and in step S2, the second color parameter of the fiber during pre-oxidation is obtained. Then, in step S3, the pre-oxidation degree of the carbon fiber in the current pre-oxidation process can be determined according to the color difference between the first color parameter and the second color parameter.

[0058] Since the influencing factors of the generation of chromogenic genes are mainly the heat treatment temperature and heat treatment time in the pre-oxidation process, and have nothing to do with the drafting in the pre-oxidation process, the pre-oxidation degree of carbon fiber is also affected by the temperature and pre-oxidation time in the pre-oxidation process. For the conventional production process of fiber scale, when the production line speed remains unchanged, the heat treatment time remains unchanged, and then the adjustment of the initial pre-oxidation degree can be achieved by adjusting the heat treatment temperature. Therefore, the present application can first judge the current pre-oxidation degree of carbon fiber according to the color difference value of the first color parameter and the second color parameter, and then adjust the temperature parameter in the pre-oxidation process according to the current pre-oxidation degree, and adjust it to the required degree. Specifically, it can be judged whether the current fiber pre-oxidation degree is too high or too low according to the color difference value of the fiber, and then reduce or increase the temperature of the pre-oxidation process according to the judgment result. Since the acquisition of the first color parameter and the second color parameter is fast and intuitive, the color change can be captured in real time through the optical system, providing instant feedback, and according to the size of the color difference value, the pre-oxidation degree can be quickly judged without complex calculations, so the present application can adjust the temperature in real time according to the color difference value and then adjust the pre-oxidation degree in real time, which helps to accurately and quickly control the pre-oxidation effect and improve product quality and production efficiency.

[0059] In one embodiment, obtaining the first color parameter of the fiber before pre-oxidation treatment includes: obtaining the brightness value, red-green value, and blue-yellow value of the fiber before pre-oxidation treatment as the first color parameter. Obtaining the second color parameter of the fiber during pre-oxidation treatment includes: obtaining the brightness value, red-green value, and blue-yellow value of the fiber during pre-oxidation treatment as the second color parameter. By refining the first color parameter and the second color parameter into brightness value, red-green value, and blue-yellow value, it is possible to comprehensively capture the subtle changes in fiber color from multiple dimensions. This multi-parameter comprehensive consideration method greatly improves the accuracy of color difference value calculation. Based on more accurate color difference values ​​to judge the degree of pre-oxidation, the present application makes the evaluation of the pre-oxidation state of carbon fiber more accurate and reliable, thereby providing a more scientific and accurate basis for the subsequent temperature parameter adjustment, ensuring that the adjustment of the degree of pre-oxidation can accurately achieve the expected goal, and effectively improving the production quality and process control level of fiber products.

[0060] In one embodiment, the color difference value is calculated by obtaining the difference between the brightness value of the first color parameter and the brightness value of the second color parameter as the brightness difference value, obtaining the difference between the red-green value of the first color parameter and the red-green value of the second color parameter as the red-green difference value, obtaining the difference between the blue-yellow value of the first color parameter and the blue-yellow value of the second color parameter as the blue-yellow difference value, and taking the square root of the sum of the squares of the brightness difference value, the red-green difference value, and the blue-yellow difference value as the color difference value, which is expressed as a total color difference ΔEab by a formula, and the calculation formula is ΔEab=[(ΔL) 2 +(Δa)2 +(Δb) 2 ] 1 / 2 , where ΔL represents the brightness difference, Δa represents the red-green color difference, and Δb represents the blue-yellow color difference. This formula is simple and clear, and can be easily calculated and monitored in real time through existing measurement equipment and calculation modules. The color difference value calculation can be easily integrated into the automatic control system to achieve more accurate online monitoring and feedback adjustment.

[0061] According to the above formula, taking carbon fiber filament as a specific example, the relationship between the initial pre-oxidation parameters of carbon fiber filament and the carbon fiber performance is tested, and it can be obtained that Figure 3 The corresponding relationship shown in the figure. The preoxidation density shown in the figure is the density of the carbon fiber filament during the preoxidation process, and the carbon fiber performance is the performance parameter of the carbon fiber filament, wherein the carbon fiber filament can also be simply referred to as carbon fiber. The raw fiber of carbon fiber is selected in the following numerical range, brightness value: 85.00-90.00; red-green value: 0.50-5.00; blue-yellow value: 10.00-17.50. The unit of brightness value is (cd / m 2 ); As for the red-green value and the blue-yellow value, in the International Commission on Illumination color space, such as the color space (L* axis, a* axis, b* axis) specified by the International Commission on Illumination in 1976, the red-green value (a* axis) and the blue-yellow value (b* axis) are relative values. The a* axis represents from green (negative direction) to red (positive direction), and the b* axis represents from blue (negative direction) to yellow (positive direction). These values ​​are calculated by color measuring instruments based on the spectral distribution of the color. According to Figure 3 As shown in the figure, it can be seen that the color difference value ΔEab has an obvious linear relationship with the initial pre-oxidized body density. After fitting, R 2 The fitting degree is 0.99, so ΔEab can be used to characterize the initial pre-oxidation degree. 2 Is a measure of the fit of the linear regression model. This statistic indicates the percentage of variance in the dependent variable that is jointly explained by the independent variables. R 2 It is convenient to use a 0-1 scale to measure the strength of the relationship between the model and the dependent variable.

[0062] In one embodiment, the temperature parameters in the pre-oxidation process are adjusted according to the color difference value between the first color parameter and the second color parameter, including: when the color difference value is greater than the first preset value, the temperature in the pre-oxidation process is lowered; when the color difference value is less than the second preset value, the temperature in the pre-oxidation process is increased; wherein the second preset value is less than the first preset value. When the color difference value is greater than the first preset value, it proves that the current fiber pre-oxidation degree is too high, and the temperature needs to be lowered to reduce the fiber pre-oxidation degree; when the color difference value is less than the second preset value, it proves that the current fiber pre-oxidation degree is low, and the temperature needs to be increased to increase the fiber pre-oxidation degree. When the color difference value is between the first preset value and the second preset value, it proves that the current fiber pre-oxidation degree is appropriate, and the performance of the produced fiber meets the requirements, and there is no need to adjust the temperature in the pre-oxidation process. According to Figure 3 It can be seen that if the pre-oxidation degree of the fiber is too high or too low, the performance of the fiber finally produced will be reduced. This embodiment adjusts the temperature during the pre-oxidation process according to the relationship between the color difference value and the first preset value and the second preset value, so as to accurately control the pre-oxidation degree of the fiber within the required range, effectively avoiding the problems such as the decline of fiber performance caused by improper pre-oxidation degree, ensuring that the fiber can have good performance in the subsequent production and processing process, and improving the stability of the product.

[0063] In one embodiment, when the color difference value is greater than the first preset value, the temperature adjustment value in the pre-oxidation process is a, and the difference between the color difference value and the first preset value is b, and a is positively correlated with b, that is, the greater the difference between the color difference value and the first preset value, the greater the adjusted temperature difference, wherein the unit of temperature is ° C. Figure 3 It can be seen that the greater the difference between the color difference value and the first preset value, the worse the performance of the fiber, and the greater the temperature adjustment during the pre-oxidation process, which can make the pre-oxidation degree of the fiber return to the appropriate range more quickly, effectively reduce the degradation of fiber performance caused by inappropriate pre-oxidation degree, reduce the number of unqualified fibers produced, improve overall production efficiency and product quality, and ensure that the final product can meet the established performance standards and application requirements.

[0064] In another embodiment, when the color difference value is less than the second preset value, the temperature adjustment value during the pre-oxidation process is m, the difference between the color difference value and the second preset value is n, m is positively correlated with n, and the unit of temperature is ° C. Similarly, this embodiment can effectively reduce the degradation of fiber performance caused by inappropriate pre-oxidation degree and reduce the number of unqualified fibers produced.

[0065] In one embodiment, when the color difference value is greater than the third preset value, a first reminder signal is issued, wherein the third preset value is greater than the first preset value; when the color difference value is less than the fourth preset value, a second reminder signal is issued, wherein the fourth preset value is less than the second preset value. That is, when the color difference value is between the first preset value and the second preset value, it is not necessary to adjust the temperature value in the pre-oxidation process. When the color difference value is between the first preset value and the third preset value, or when the color difference value is between the second preset value and the fourth preset value, the temperature value in the pre-oxidation process is adjusted according to the value of the specific color difference value. When the color difference value is greater than the third preset value, or less than the fourth preset value, it means that the current color difference value is in an over-limit situation. It is difficult to restore the pre-oxidation degree to a suitable range by simply adjusting the temperature value in the pre-oxidation process, and the fiber performance after pre-oxidation is poor. In this case, it is necessary to send a first reminder signal or a second reminder signal respectively to remind the operator whether the current color difference value is too large or too small, so as to facilitate manual intervention, conduct comparative detection by conventional methods, and perform corresponding operations based on the detection results. The present application sets a third preset value and a fourth preset value. When the color difference value does not exceed the range formed by these two set values, the pre-oxidation degree is automatically adjusted; when the color difference value exceeds the range formed by these two set values, a reminder is given for manual intervention. This method combines machine automatic adjustment with flexible manual intervention, giving full play to the advantages of both, and realizing intelligent and refined control of the pre-oxidation process, which not only improves the degree of automation and efficiency of production, but also enhances the reliability and adaptability of the system, and can effectively cope with various complex production situations.

[0066] In one embodiment, when the color difference value is greater than the first preset value and less than the fifth preset value, the temperature in the pre-oxidation process is lowered by 0.3°C-0.7°C; when the color difference value is greater than the fifth preset value and less than the third preset value, the temperature in the pre-oxidation process is lowered by 0.8°C-1.2°C; the fifth preset value is greater than the first preset value and less than the third preset value. That is, the fifth preset value is set within the range of the first preset value and the third preset value. When the color difference value is less than the first preset value and greater than the second preset value, it proves that the fiber performance produced by the current pre-oxidation process is qualified. When the color difference value is between the first preset value and the fifth preset value, the color difference value is smaller than the first preset value. A smaller adjustment of the temperature value in the pre-oxidation process can make the pre-oxidation degree reach the appropriate range. The smaller adjustment is to lower the temperature by 0.3°C-0.7°C, for example, it can be 0.3°C, 0.35°C, 0.4°C, 0.6°C, 0.7°C, etc. When the color difference value is between the fifth preset value and the third preset value, the color difference value is far from the first color difference value, and a large adjustment is required to the temperature value in the pre-oxidation process so that the pre-oxidation degree is within a reasonable range. The large adjustment is to lower the temperature by 0.8℃-1.2℃, for example, it can be 0.8℃, 0.85℃, 0.9℃, 1.0℃, 1.2℃, etc.

[0067] In another embodiment, when the color difference value is less than the second preset value and greater than the sixth preset value, the temperature during the pre-oxidation process is increased by 0.3°C-0.7°C; when the color difference value is less than the sixth preset value and greater than the fourth preset value, the temperature during the pre-oxidation process is increased by 0.8°C-1.2°C; the sixth preset value is less than the second preset value and greater than the fourth preset value. Similar to the previous embodiment, the color difference value is between the second preset value and the sixth preset value, and the color difference value is smaller than the second preset value, so only a smaller adjustment temperature value is needed to make the pre-oxidation degree reach the appropriate range, that is, increase by 0.3°C-0.7°C, for example, it can be 0.3°C, 0.35°C, 0.4°C, 0.6°C, 0.7°C, etc. The color difference value is between the sixth preset value and the fourth preset value, and a larger adjustment temperature value is required to make the pre-oxidation degree reach the appropriate range, that is, increase by 0.8°C-1.2°C, for example, it can be 0.8°C, 0.85°C, 0.9°C, 1.0°C, 1.2°C, etc.

[0068] In one embodiment, the first preset value is 72.4-73.4, for example, it can be 72.4, 72.6, 72.9, 73, 73.4, etc. The second preset value is 68.5-69.5, for example, it can be 68.5, 68.8, 69, 69.2, 69.5, etc. The third preset value is 74.5-75.5, for example, it can be 74.5, 74.8, 75, 75.2, 75.5, etc. The fourth preset value is 65-66, for example, it can be 65, 65.2, 65.5, 65.8, 66, etc. Further, the fifth preset value is 74.1, and the sixth preset value is 67.3. In this embodiment, the preset values ​​are based on Figure 3 The test result analysis setting, the specific color difference value adjustment strategy after setting can be referred to Figure 4 The corresponding relationship between the color difference value and the adjustment strategy, Figure 4 The adjustment state shown in is the adjustment strategy. In a specific example, for example, when the value of ΔEab is 67, the pre-oxidation temperature during the pre-oxidation of the carbon fiber is increased by 1°C; for another example, when the value of ΔEab is 70, it means that the pre-oxidation temperature is in a suitable range and there is no need to adjust the pre-oxidation temperature; for another example, when the value of ΔEab is 76, it means that the pre-oxidation temperature is abnormal, which seriously affects the performance of the carbon fiber filament. At this time, an alarm is issued to remind relevant staff to pay attention and conduct troubleshooting in time to avoid more serious problems.

[0069] Please refer to Figure 4 and Figure 6 Specifically, adjusting the temperature in the pre-oxidation process according to the color difference value may also include first determining whether it is necessary to adjust the temperature in the pre-oxidation process according to the color difference value, that is, Figure 2In the judgment of adjustable and non-adjustable, Figure 2 It is a control flow chart. When it is judged to be unadjustable, it is divided into no need for adjustment and the first alarm signal or the second alarm signal is issued by the alarm device. When the color difference value is between the first preset value and the second preset value, no adjustment is required. When the color difference value is greater than the third preset value, or less than the fourth preset value, the alarm device needs to issue an alarm signal. When it is judged to be adjustable, that is, the color difference value is between the first preset value and the third preset value, or between the second preset value and the fourth preset value, according to Figure 4 The temperature is adjusted using the adjustment strategy.

[0070] This application also provides a fiber pre-oxidation device, please refer to Figure 5 and Figure 6 , Figure 5 This is a schematic diagram of the original fiber before entering the pre-oxidation furnace. Figure 6 This is a schematic diagram of the interior of the pre-oxidation furnace. Figure 5 and Figure 6 The arrows in the figure indicate the direction of fiber running. Figure 5 Enter from the middle right Figure 6 on the left side and from Figure 6 The outlet output of the right pre-oxidation furnace in the figure. Using any of the above adjustment methods, the fiber pre-oxidation device includes a pre-oxidation furnace 100, a color difference detection device 200, a temperature control device and a control device (not shown in the figure). The fiber is pre-oxidized in the pre-oxidation furnace 100, so the above-mentioned adjustment of the temperature during the pre-oxidation process can be directly understood as adjusting the temperature inside the pre-oxidation furnace 100.

[0071] The color difference detection device 200 includes a non-contact colorimeter and a detection track, wherein the detection track can be an auxiliary beam detection track, which provides a stable measurement platform for the non-contact colorimeter, and the non-contact colorimeter can avoid the influence on the fiber during the color difference detection process. The number of color difference detection devices 200 is at least two, and at least one of the two color difference detection devices 200 is configured to reciprocate at the fiber entrance of the pre-oxidation furnace 100 for detection. Figure 5 The position in the pre-oxidation furnace is near the front roller frame 300. The other of the at least two color difference detection devices is configured to reciprocate at the fiber outlet of the pre-oxidation furnace 100 for detection. The reciprocating motion is to move repeatedly along the detection track in the fiber distribution direction to avoid local detection errors. The temperature control device is arranged inside the pre-oxidation furnace 100. The temperature control device is used to detect and adjust the internal temperature of the pre-oxidation furnace 100. The temperature control device can be a heater, a hot air circulation fan, a heating element, etc.

[0072] The control device is electrically connected to the color difference detection device 200 and the temperature control device, respectively, and is used to control the temperature control device according to the measured color difference value. The control device receives the electrical signal of the color difference detection device 200, including the signals respectively measured by at least two color difference detection devices 200 at the fiber inlet of the pre-oxidation furnace 100 and the fiber outlet of the pre-oxidation furnace 100, so that the control device obtains the first color parameter and the second color parameter, and calculates the color difference value of the fiber before and after pre-oxidation according to the formula. Then the control device controls the temperature control device according to the calculated color difference value to adjust the internal temperature of the pre-oxidation furnace 100. Adjustment is performed according to a pre-set adjustment logic. In summary, the fiber pre-oxidation device provided in the present application can realize real-time control of the fiber pre-oxidation degree in the pre-oxidation furnace.

[0073] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the disclosure disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0074] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A fiber pre-oxidation regulation method, characterized in that: include: Acquiring a first color parameter of the fiber before pre-oxidation treatment; Obtaining a second color parameter of the fiber during the pre-oxidation treatment; The temperature parameter in the pre-oxidation process is adjusted according to the color difference between the first color parameter and the second color parameter.

2. The fiber pre-oxidation conditioning method according to claim 1, characterized in that: The step of obtaining the first color parameter of the fiber before the pre-oxidation treatment comprises: Obtaining the brightness value, red-green value, and blue-yellow value of the fiber before the pre-oxidation treatment as the first color parameter; The step of obtaining a second color parameter of the fiber during the pre-oxidation treatment comprises: The brightness value, red-green value, and blue-yellow value of the fiber during the pre-oxidation treatment are obtained as the second color parameter.

3. The fiber pre-oxidation adjustment method according to claim 2, characterized in that: include: Obtaining a difference between a brightness value of the first color parameter and a brightness value of the second color parameter as a brightness difference value, obtaining a difference between a red-green value of the first color parameter and a red-green value of the second color parameter as a red-green difference value, and obtaining a difference between a blue-yellow value of the first color parameter and a blue-yellow value of the second color parameter as a blue-yellow difference value; The square root of the sum of the squares of the brightness difference value, the red-green difference value and the blue-yellow difference value is calculated as the color difference value.

4. The fiber pre-oxidation conditioning method according to any one of claims 1 to 3, characterized in that: The step of adjusting the temperature parameter in the pre-oxidation process according to the color difference between the first color parameter and the second color parameter includes: When the color difference value is greater than a first preset value, lowering the temperature during the pre-oxidation treatment process; When the color difference value is less than a second preset value, increasing the temperature in the pre-oxidation process; The second preset value is smaller than the first preset value.

5. The fiber pre-oxidation conditioning method according to claim 4, characterized in that: When the color difference value is greater than the first preset value, the temperature reduction value during the pre-oxidation treatment is a, the difference between the color difference value and the first preset value is b, and a is positively correlated with b; and / or When the color difference value is less than the second preset value, the temperature reduction value in the pre-oxidation process is m, the difference between the color difference value and the second preset value is n, and m is positively correlated with n.

6. The fiber pre-oxidation conditioning method according to claim 5, characterized in that: When the color difference value is greater than a third preset value, a first reminder signal is issued, and the third preset value is greater than the first preset value; When the color difference value is less than a fourth preset value, a second reminder signal is issued, and the fourth preset value is less than the second preset value.

7. The fiber pre-oxidation conditioning method according to claim 6, characterized in that: When the color difference value is greater than the first preset value and less than the fifth preset value, lowering the temperature during the pre-oxidation treatment by 0.3° C. to 0.7° C.; When the color difference value is greater than the fifth preset value and less than the third preset value, the temperature in the pre-oxidation process is lowered by 0.8° C. to 1.2° C.; The fifth preset value is greater than the first preset value and less than the third preset value.

8. The fiber pre-oxidation conditioning method according to claim 6, characterized in that: When the color difference value is less than the second preset value and greater than the sixth preset value, the temperature in the pre-oxidation process is increased by 0.3° C.-0.7° C.; When the color difference value is less than the sixth preset value and greater than the fourth preset value, the temperature in the pre-oxidation process is increased by 0.8° C.-1.2° C.; The sixth preset value is smaller than the second preset value and larger than the fourth preset value.

9. The fiber pre-oxidation conditioning method according to claim 6, characterized in that: The first preset value is 72.4-73.4, and the second preset value is 68.5-69.5; The third preset value is 74.5-75.5, and the fourth preset value is 65-66.

10. A fiber pre-oxidation regulating device, characterized in that: Using the adjustment method according to any one of claims 1 to 9, the fiber pre-oxidation adjustment device comprises: Pre-oxidation furnace, in which the fiber is pre-oxidized: A color difference detection device, comprising a non-contact colorimeter and a detection track, wherein the number of the color difference detection devices is at least two, one of the at least two color difference detection devices is configured at the fiber entrance of the pre-oxidation furnace to reciprocate for detection, and the other of the at least two color difference detection devices is configured at the fiber exit of the pre-oxidation furnace to reciprocate for detection; A temperature control device is arranged inside the pre-oxidation furnace, and is used to detect and adjust the internal temperature of the pre-oxidation furnace; The control device is electrically connected to the color difference detection device and the temperature control device respectively. The control device receives the electrical signal of the color difference detection device, calculates the color difference value of the fiber before and after pre-oxidation, and controls the temperature control device to adjust the internal temperature of the pre-oxidation furnace according to the color difference value.

Images