Ultraviolet aging detection and grading evaluation method and equipment for glass fiber wound gas cylinder with metal liner

Abstract

The invention discloses an ultraviolet aging detection and grading evaluation method and equipment for a glass fiber wound gas cylinder with a metal liner, and relates to the technical field of inspection, detection and evaluation of wound gas cylinders. The method comprises the following steps: determining a reference color coordinate which does not generate ultraviolet aging damage on the metal liner glass fiber wound gas cylinder; the method comprises the following steps: performing an ultraviolet aging test on a metal liner glass fiber wound gas cylinder homologous with a gas cylinder to be tested, and determining a chromatic aberration upper limit value of a degraded single point, a chromatic aberration lower limit value influencing the safety performance in a degraded region and a region area limit value based on a reference color coordinate; establishing a grading evaluation comparison table of the ultraviolet aging damage according to the chromatic aberration upper limit value and the region area limit value; the ultraviolet aging damage grade of the to-be-detected gas cylinder can be obtained by performing color difference detection on the to-be-detected gas cylinder and inquiring the grading evaluation comparison table. According to the invention, ultraviolet aging detection and grading evaluation of the glass fiber wound gas cylinder with the metal liner can be realized.

Description

Technical Field

[0001] This application relates to the field of inspection, testing and evaluation technology for wound gas cylinders, and in particular to a method and equipment for ultraviolet aging detection and grading evaluation of metal-lined glass fiber wound gas cylinders. Background Technology

[0002] Metal-lined fiberglass-wound gas cylinders (Type II cylinders) offer advantages over traditional metal cylinders, including higher strength, lighter weight, and greater safety redundancy. Traditional metal cylinders rely heavily on the thickness of the metal material to ensure pressure resistance, resulting in a significant overall weight. For example, under the same volume and operating pressure, a Type II cylinder weighs only one-third to one-half that of a steel cylinder and about two-thirds that of an aluminum alloy cylinder. This lightweight advantage is particularly pronounced in mobile applications, such as vehicle-mounted natural gas cylinders, diving cylinders, and drone power cylinders, effectively reducing equipment load, energy consumption, and simplifying manual handling, thus lowering physical labor costs and safety risks during operation. From the perspectives of energy conservation, environmental protection, and lightweight design, lightweight fiber-wound gas cylinders represent the future direction of gas storage and transportation.

[0003] However, composite gas cylinders also have several disadvantages, such as susceptibility to external damage and aging under long-term ultraviolet radiation, leading to a shortened lifespan. When Type II cylinders are used for extended periods in harsh environments such as salt spray, humidity, and ultraviolet radiation, the outer surface of the composite material will gradually discolor or experience resin performance degradation, among other aging phenomena. Ultraviolet aging is one of the more common aging methods for Type II cylinders. Visually, after prolonged exposure to sunlight, the surface of the composite material becomes lighter and yellower, its gloss diminishes, the surface becomes rougher, and resin detachment occurs. Both changes in resin surface morphology and material performance degradation directly affect the safety of using composite materials.

[0004] Therefore, conducting UV aging tests and grading evaluations on Type II bottles is of great significance for ensuring the safety of composite materials in use. Summary of the Invention

[0005] The purpose of this application is to provide a method and equipment for ultraviolet aging detection and grading evaluation of metal-lined glass fiber wound gas cylinders, which can realize ultraviolet aging detection and grading evaluation of metal-lined glass fiber wound gas cylinders.

[0006] To achieve the above objectives, this application provides the following solution: In a first aspect, this application provides a method for ultraviolet aging detection and grading evaluation of metal-lined glass fiber wound gas cylinders, including: Determine the reference color coordinates for preventing UV aging damage on gas cylinders with metal liner and glass fiber winding. By conducting ultraviolet aging tests on glass fiber wound gas cylinders with metal liner of the same origin as the gas cylinder under test, and based on the reference color coordinates, the upper limit value of color difference at a deteriorated single point, the lower limit value of color difference affecting safety performance in the deteriorated area, and the area limit value are determined; the area limit value is the area of ​​the deteriorated area where the color difference is greater than or equal to the lower limit value of color difference. A graded evaluation comparison table for UV aging damage was established based on the upper limit of color difference and the limit of area. The maximum color difference value of a single measurement point on the gas cylinder under test and the area of ​​the region with a color difference greater than or equal to the lower limit of color difference in the deteriorated measurement part of the gas cylinder under test are obtained. The UV aging damage level of the gas cylinder under test is obtained by querying the graded evaluation comparison table.

[0007] Secondly, this application provides an ultraviolet aging detection and grading evaluation device for metal-lined glass fiber wound gas cylinders, including: an ultraviolet aging test device, a color coordinate measuring device, and a processor; The ultraviolet aging test apparatus is used to conduct ultraviolet aging tests on glass fiber wound gas cylinders with metal inner liners that are of the same origin as the gas cylinders under test. The color coordinate measuring device is used to measure the color coordinates of individual deterioration points and the color coordinates of deteriorated areas after ultraviolet aging tests. The processor is used to determine the reference color coordinates of the metal-lined glass fiber wound gas cylinder to prevent ultraviolet aging damage; and based on the reference color coordinates, the color coordinates of the deteriorated single point, and the color coordinates of the deteriorated area, to determine the upper limit of the color difference of the deteriorated single point, the lower limit of the color difference affecting the safety performance within the deteriorated area, and the area limit value; the area limit value is the area of ​​the deteriorated area where the color difference is greater than or equal to the lower limit of the color difference; and to establish a graded evaluation comparison table for ultraviolet aging damage based on the upper limit of the color difference and the area limit value. The processor is also used to obtain the maximum color difference of a single measurement point on the gas cylinder under test and the area of ​​the region with a color difference greater than or equal to the lower limit of the color difference in the deteriorated measurement part of the gas cylinder under test, and to obtain the UV aging damage level of the gas cylinder under test by querying the graded evaluation comparison table.

[0008] According to the specific embodiments provided in this application, this application has the following technical effects: This application provides a method and equipment for ultraviolet aging detection and grading evaluation of metal-lined glass fiber wound gas cylinders. Through ultraviolet aging tests and reference color coordinates, color difference detection is performed on deteriorated single points and deteriorated areas to achieve ultraviolet aging detection of metal-lined glass fiber wound gas cylinders. Based on the upper limit of color difference and the limit of area, a grading evaluation table for ultraviolet aging damage is established. By consulting this grading evaluation table, the ultraviolet aging damage level of the gas cylinder under test can be obtained, thus realizing the ultraviolet aging grading evaluation of metal-lined glass fiber wound gas cylinders. Attached Figure Description

[0009] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0010] Figure 1 This is a flowchart illustrating a method for ultraviolet aging detection and grading evaluation of a metal-lined glass fiber wound gas cylinder, as provided in an embodiment of this application. Detailed Implementation

[0011] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0012] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0013] The main manifestation of UV aging damage is a change in appearance color. Therefore, by referencing the detection methods for paint film color difference, and using instruments such as spectrophotometers, spectrophotometers, or tristimulus colorimeters, and referring to GB / T11186-2025 "Methods for Measuring Coating Color" to perform color difference detection on the surface of gas cylinders, the degree of UV aging damage can be effectively quantitatively assessed. In view of this, in an exemplary embodiment, such as... Figure 1 As shown, a method for ultraviolet aging detection and grading evaluation of a metal-lined glass fiber wound gas cylinder is provided, including the following steps 101 to 104.

[0014] Step 101: Determine the reference color coordinates for preventing UV aging damage on the metal-lined glass fiber-wound gas cylinder.

[0015] Step 102: By conducting an ultraviolet aging test on a glass fiber-wound gas cylinder with a metal liner of the same origin as the gas cylinder to be tested, and based on the reference color coordinates, determine the upper limit of color difference at a deteriorated single point, the lower limit of color difference affecting safety performance within the deteriorated area, and the area limit value; the area limit value is the area of ​​the deteriorated area where the color difference is greater than or equal to the lower limit of color difference.

[0016] Step 103: Establish a graded evaluation comparison table for UV aging damage based on the upper limit of color difference and the limit of area.

[0017] Step 104: Obtain the maximum color difference value of a single measurement point on the gas cylinder to be tested and the area of ​​the region with a color difference greater than or equal to the lower limit of color difference in the deteriorated measurement part of the gas cylinder to be tested, and obtain the UV aging damage level of the gas cylinder to be tested by querying the graded evaluation comparison table.

[0018] Steps 101 to 104 described above involve two parts: a color difference detection method and a damage grading evaluation method. Steps 101 to 102 constitute the color difference detection method, and steps 103 to 104 constitute the damage grading evaluation method.

[0019] (a) Color difference detection method In another exemplary embodiment of this application, the process of determining the reference color coordinates in step 101 above can be replaced by the following steps 201 to 203.

[0020] Step 201: Wrap the metal inner liner with glass fiber around the part of the gas cylinder that will not be damaged by ultraviolet aging, and determine it as the reference measurement part.

[0021] Step 202: Select multiple reference measurement points in the reference measurement area.

[0022] For example, the reference measurement location is determined to include at least three cross-sections, and the distance between the cross-sections is greater than 15% of the total length of the glass fiber wound gas cylinder with a metal liner; every 90 degrees on each cross-section ° Select a benchmark measurement point.

[0023] Step 203: Obtain the color coordinates of each reference measurement point, and determine the average color coordinates of all reference measurement points as the reference color coordinates that will not cause UV aging damage.

[0024] In another exemplary embodiment of this application, step 102 described above may be replaced by steps 301 to 305.

[0025] Step 301: Conduct an ultraviolet aging test on the glass fiber wound gas cylinder with a metal liner of the same origin as the gas cylinder to be tested, to form a deterioration area and multiple deterioration points.

[0026] The ultraviolet aging test can simulate the actual working conditions of a gas cylinder with a metal liner and glass fiber winding. The entire gas cylinder is uniformly exposed to ultraviolet light, and the intensity and duration of ultraviolet irradiation are adjustable.

[0027] Step 302: Measure the color coordinates of each deteriorated point and determine the color difference of each deteriorated point by comparing the color coordinates of the deteriorated point with the reference color coordinates.

[0028] For example, the color coordinates of each deteriorated point are measured using a qualified or calibrated spectrophotometer, spectrophotometer, or tristimulus colorimeter.

[0029] Step 303: Determine the maximum color difference value that does not affect safety performance among all deteriorated individual points as the upper limit value of color difference for deteriorated individual points.

[0030] Step 304: Divide the deteriorated area into grids and measure the color coordinates of each grid. The difference between the color coordinates of each grid and the reference color coordinates is determined as the color difference of each grid.

[0031] Step 305: Determine the minimum color difference affecting safety performance among all the color differences in the grid as the lower limit of color difference affecting safety performance in the deteriorated area.

[0032] In another exemplary embodiment of this application, "same origin" refers to the same material, the same manufacturer, and the same manufacturing process.

[0033] The more detailed implementation process of the color difference detection method is as follows: (1) The gas cylinders should be prepared and all debris that may hinder inspection should be removed from the outer surface of the gas cylinders. If necessary, the gas cylinders can be removed from the tubular container to ensure that 100% inspection of the outer surface of the gas cylinders can be carried out.

[0034] (2) Refer to GB / T 11186-2025 "Methods for measuring the color of coatings" and use a qualified spectrophotometer, spectrophotometer or tristimulus colorimeter for measurement.

[0035] (3) Measurement locations are divided into baseline measurement locations and key measurement locations: The baseline measurement locations should be selected in areas where UV aging damage is unlikely, and at least three cross-sections should be selected. The distance between each cross-section should be greater than 15% of the total length of the gas cylinder, and each cross-section should be spaced 90 mm apart. ° Select reference measurement points on the left and right. The selection of reference measurement points should ensure that the average color measurement value can effectively represent the average color state of normal parts of the entire gas cylinder.

[0036] When the area damaged by UV aging is large, the above requirements can be relaxed, and normal areas should be selected as the baseline measurement sites as much as possible. Key measurement sites should be selected in areas prone to UV aging damage, preferably areas with significant color differences observed during visual inspection. Small areas with significant color differences from the surrounding area that are not prone to aging may be exempt from key measurement, depending on the circumstances.

[0037] Using the color coordinates obtained from the reference measurement location as a reference, the color difference of each key measurement location is measured to obtain the actual color difference value of each point.

[0038] (4) The following results should be recorded for color difference detection: single-point color difference value, area of ​​area with large color difference (color difference value ≥ b); in actual measurement, the measured color difference value of any single-point color difference value ≥ b should be recorded.

[0039] (5) Upper limit of color difference at deteriorated single point (also known as color difference limit) a. Lower limit of color difference (also known as color difference excess value) b. Area limit of color difference (also known as area of ​​color difference excess) S These three values ​​are evaluation parameters obtained through ultraviolet aging tests or other engineering experience of gas cylinders made of the same material, manufactured by the same manufacturer and manufactured by the same process: The color difference limit value 'a' is the maximum color difference that does not affect safety performance after UV aging test. If the measured color difference exceeds this value, it indicates that the gas cylinder has deteriorated to the point of affecting safe use. The color difference value b is the limit value that may affect safety performance if the deterioration occurs in areas after the ultraviolet aging test. If the measured color difference exceeds this value and the area is ≥ S, it means that the gas cylinder has deteriorated to the point of affecting safe use. The area S of the area with large color difference is the limit value of the area of ​​large color difference that may affect safety performance if the deterioration occurs after the ultraviolet aging test. If the area with large color difference is ≥ S, it means that the gas cylinder has deteriorated to the point of affecting safe use.

[0040] (II) Methods for evaluating injury grading In another exemplary embodiment of this application, the severity of UV aging of a single gas cylinder should be evaluated comprehensively based on the measured value of the color difference at a single point and the area of ​​the region with a large color difference (i.e., color difference ≥ b). The grading evaluation table for UV aging damage in step 103 above includes: When the maximum color difference is less than or equal to the upper limit of color difference and the area is less than or equal to the limit of area, the level of UV aging damage is rated as Grade A. When the maximum color difference is less than or equal to the upper limit of color difference, and the area of ​​the region is greater than the limit of the area, the level of UV aging damage is rated as Grade B. When the maximum color difference is greater than the upper limit of color difference and the area is less than or equal to the limit of area, the level of UV aging damage is rated as Grade B. When the maximum color difference exceeds the upper limit of color difference and the area of ​​the affected region exceeds the limit of the area of ​​the affected region, the level of UV aging damage is rated as Grade C.

[0041] Among them, the degree of UV aging damage represented by Grade A, Grade B, and Grade C increases in that order.

[0042] The grading evaluation comparison table is shown in Table 1.

[0043] Table 1. Grading Evaluation Comparison Table

[0044] In another exemplary embodiment of this application, the treatment of damage of the corresponding level is recommended as follows: (1) If the UV aging damage level of the gas cylinder to be tested is Grade A, then generate a recommendation that allows its use; (2) If the UV aging damage level of the gas cylinder to be tested is Grade B, then a recommendation for monitoring its use will be generated. Monitoring and Usage: The focus should be on monitoring whether the ultraviolet protection measures are always effective during vehicle operation, whether there are any abnormalities in the vehicle's operating conditions, and to conduct regular visual inspections and color difference tests on ultraviolet aging areas every year.

[0045] (3) If the UV aging damage level of the gas cylinder to be tested is C, then a comprehensive verification recommendation is generated.

[0046] Comprehensive verification: First, consider whether the selection of a, b, and S is appropriate. If there is experimental data to support it, and it is believed that exceeding the given parameters poses a great safety risk, the cylinder should be rejected. If there is a lack of data to support it, consider supplementing the corresponding tests in a timely manner, or use other means to comprehensively evaluate whether the cylinder can continue to be used.

[0047] The following example illustrates the method of this application using a large-capacity steel-lined glass fiber circumferentially wound gas cylinder manufactured by a certain company. The cylinder has an inner outer diameter of 559mm, a length of 3m, a volume of 650 liters, a nominal working pressure of 20MPa, and a winding layer of glass fiber 158B-2400TEX + epoxy resin TW101.

[0048] UV aging tests were conducted on the steel-lined glass fiber circumferentially wound gas cylinder. The UV aging time was 1600 hours, and the remaining life and strength properties both met the standard requirements. Therefore, the following data were obtained through testing and color difference measurement: The single-point color difference limit value is a = 9.38. The color difference is too large, with a value of b=7.27; The area with a large color difference (i.e., a color difference ≥ 7.27) is S = 1.13 square meters.

[0049] Therefore, the UV aging grading evaluation for this type of gas cylinder should be as shown in Table 2.

[0050] Table 2. Examples of Graded Evaluation Comparisons

[0051] (1) If the evaluation result is Grade A, it is recommended that it be allowed to be used; (2) For those with an assessment result of Grade B, monitoring is recommended; (3) If the evaluation result is C, other methods should be considered for comprehensive verification.

[0052] This application belongs to the field of special equipment inspection, testing and evaluation technology. Based on color difference detection, it realizes the graded evaluation of ultraviolet aging damage of steel inner liner fiber-wound gas cylinders.

[0053] Based on the same inventive concept, this application also provides an ultraviolet aging detection and grading evaluation device for metal-lined glass fiber wound gas cylinders, used to implement the aforementioned method for ultraviolet aging detection and grading evaluation of metal-lined glass fiber wound gas cylinders. The solution provided by this device is similar to the solution described in the above method. Therefore, the specific limitations of one or more embodiments of the ultraviolet aging detection and grading evaluation device for metal-lined glass fiber wound gas cylinders provided below can be found in the limitations of the ultraviolet aging detection and grading evaluation method for metal-lined glass fiber wound gas cylinders described above, and will not be repeated here.

[0054] In one exemplary embodiment, a device for ultraviolet aging detection and grading evaluation of a metal-lined glass fiber wound gas cylinder is provided, comprising: an ultraviolet aging test device, a color coordinate measuring device, and a processor.

[0055] The UV aging test apparatus is used to conduct UV aging tests on glass fiber wound gas cylinders with metal liner, which are of the same origin as the gas cylinder under test. The color coordinate measuring apparatus is used to measure the color coordinates of individual deterioration points and the color coordinates of deteriorated areas after the UV aging test.

[0056] The processor is used to determine the reference color coordinates of the metal-lined glass fiber-wound gas cylinder to prevent ultraviolet aging damage; and based on the reference color coordinates, the color coordinates of the deteriorated single point, and the color coordinates of the deteriorated area, it determines the upper limit of the color difference of the deteriorated single point, the lower limit of the color difference affecting the safety performance within the deteriorated area, and the area limit value; the area limit value is the area of ​​the deteriorated area where the color difference is greater than or equal to the lower limit of the color difference; and a graded evaluation comparison table of ultraviolet aging damage is established according to the upper limit of the color difference and the area limit value.

[0057] The processor is also used to obtain the maximum color difference of a single measurement point on the gas cylinder under test and the area of ​​the region with a color difference greater than or equal to the lower limit of the color difference in the deteriorated measurement part of the gas cylinder under test, and to obtain the UV aging damage level of the gas cylinder under test by querying the graded evaluation comparison table.

[0058] In one exemplary embodiment, the color coordinate measuring device is a calibrated or verified spectrophotometer, spectrophotometer, or tristimulus colorimeter.

[0059] In one exemplary embodiment, the ultraviolet aging test apparatus includes an outer casing, at least one ultraviolet lamp, and a drive structure. The ultraviolet lamp is disposed on the inner wall of the outer casing and is used to irradiate a metal-lined glass fiber wound gas cylinder. The drive structure drives the metal-lined glass fiber wound gas cylinder to rotate, so that all positions of the metal-lined glass fiber wound gas cylinder are exposed to the ultraviolet light of the ultraviolet lamp.

[0060] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A method for ultraviolet aging detection and grading evaluation of a metal-lined glass fiber wound gas cylinder, characterized in that, include: Determine the reference color coordinates for preventing UV aging damage on gas cylinders with metal liner and glass fiber winding. By conducting ultraviolet aging tests on glass fiber wound gas cylinders with metal liner of the same origin as the gas cylinder under test, and based on the reference color coordinates, the upper limit value of color difference at a deteriorated single point, the lower limit value of color difference affecting safety performance in the deteriorated area, and the area limit value are determined; the area limit value is the area of ​​the deteriorated area where the color difference is greater than or equal to the lower limit value of color difference. A graded evaluation comparison table for UV aging damage was established based on the upper limit of color difference and the limit of area. The maximum color difference value of a single measurement point on the gas cylinder under test and the area of ​​the region with a color difference greater than or equal to the lower limit of color difference in the deteriorated measurement part of the gas cylinder under test are obtained. The UV aging damage level of the gas cylinder under test is obtained by querying the graded evaluation comparison table.

2. The method for ultraviolet aging detection and grading evaluation of metal-lined glass fiber wound gas cylinders according to claim 1, characterized in that, Determine the reference color coordinates for preventing UV aging damage on metal-lined glass fiber-wound gas cylinders, including: The part of the gas cylinder where the metal liner is wrapped with glass fiber will not be damaged by ultraviolet aging will be determined as the reference measurement part. Select multiple reference measurement points in the reference measurement area; Obtain the color coordinates of each reference measurement point, and determine the average color coordinates of all reference measurement points as the reference color coordinates that will not cause UV aging damage.

3. The method for ultraviolet aging detection and grading evaluation of metal-lined glass fiber wound gas cylinders according to claim 2, characterized in that, Multiple reference measurement points are selected within the reference measurement area, specifically including: The reference measurement location must include at least three cross-sections, and the distance between the cross-sections must be greater than 15% of the total length of the glass fiber wound gas cylinder with a metal liner. Every 90 on each cross section ° Select a benchmark measurement point.

4. The method for ultraviolet aging detection and grading evaluation of metal-lined glass fiber wound gas cylinders according to claim 1, characterized in that, By conducting ultraviolet aging tests on glass fiber wound gas cylinders with metal liner of the same origin as the gas cylinder under test, and based on the aforementioned reference color coordinates, the upper limit of color difference at a single deterioration point and the lower limit of color difference affecting safety performance within the deterioration area are determined, specifically including: Ultraviolet aging test was conducted on the glass fiber wound gas cylinder with a metal liner that is the same as the gas cylinder under test, to form deterioration areas and multiple deterioration points. Measure the color coordinates of each deteriorated point, and determine the color difference of each deteriorated point by comparing the color coordinates of the deteriorated point with the reference color coordinates. The maximum color difference value that does not affect safety performance among all deteriorated individual points is determined as the upper limit value of color difference for deteriorated individual points; The deteriorated area is divided into grids, and the color coordinates of each grid are measured. The difference between the color coordinates of each grid and the reference color coordinates is determined as the color difference of each grid. The minimum color difference among all grids that affects safety performance is determined as the lower limit of color difference affecting safety performance within the deteriorated area.

5. The method for ultraviolet aging detection and grading evaluation of metal-lined glass fiber wound gas cylinders according to claim 4, characterized in that, The color coordinates of each deteriorated point were measured using a qualified or calibrated spectrophotometer, spectrophotometer, or tristimulus colorimeter.

6. The method for ultraviolet aging detection and grading evaluation of metal-lined glass fiber wound gas cylinders according to claim 1, characterized in that, The term "same origin" refers to the same material, the same manufacturer, and the same manufacturing process.

7. The method for ultraviolet aging detection and grading evaluation of metal-lined glass fiber wound gas cylinders according to claim 1, characterized in that, The grading and evaluation table for UV aging damage includes: When the maximum color difference is less than or equal to the upper limit of color difference and the area is less than or equal to the limit of area, the level of UV aging damage is rated as Grade A. When the maximum color difference is less than or equal to the upper limit of color difference, and the area of ​​the region is greater than the limit of the area, the level of UV aging damage is rated as Grade B. When the maximum color difference is greater than the upper limit of color difference and the area is less than or equal to the limit of area, the level of UV aging damage is rated as Grade B. When the maximum color difference exceeds the upper limit of color difference and the area of ​​the affected region exceeds the limit of the area of ​​the affected region, the level of UV aging damage is rated as Grade C. Among them, the degree of UV aging damage represented by Grade A, Grade B, and Grade C increases in that order.

8. The method for ultraviolet aging detection and grading evaluation of metal-lined glass fiber wound gas cylinders according to claim 7, characterized in that, If the UV aging damage level of the gas cylinder to be tested is Grade A, a recommendation for permissible use will be generated. If the UV aging damage level of the gas cylinder to be tested is Grade B, then a recommendation for monitoring and use will be generated. If the UV aging damage level of the gas cylinder under test is Grade C, then a comprehensive verification recommendation will be generated.

9. A device for ultraviolet aging detection and grading evaluation of metal-lined glass fiber wound gas cylinders, characterized in that, include: Ultraviolet aging test apparatus, color coordinate measuring device, and processor; The ultraviolet aging test apparatus is used to conduct ultraviolet aging tests on glass fiber wound gas cylinders with metal inner liners that are of the same origin as the gas cylinders under test. The color coordinate measuring device is used to measure the color coordinates of individual deterioration points and the color coordinates of deteriorated areas after ultraviolet aging tests. The processor is used to determine the reference color coordinates of the metal-lined glass fiber wound gas cylinder to prevent ultraviolet aging damage; and based on the reference color coordinates, the color coordinates of the deteriorated single point, and the color coordinates of the deteriorated area, to determine the upper limit of the color difference of the deteriorated single point, the lower limit of the color difference affecting the safety performance within the deteriorated area, and the area limit value; the area limit value is the area of ​​the deteriorated area where the color difference is greater than or equal to the lower limit of the color difference; and to establish a graded evaluation comparison table for ultraviolet aging damage based on the upper limit of the color difference and the area limit value. The processor is also used to obtain the maximum color difference of a single measurement point on the gas cylinder under test and the area of ​​the region with a color difference greater than or equal to the lower limit of the color difference in the deteriorated measurement part of the gas cylinder under test, and to obtain the UV aging damage level of the gas cylinder under test by querying the graded evaluation comparison table.

10. The ultraviolet aging detection and grading evaluation equipment for metal-lined glass fiber wound gas cylinders according to claim 9, characterized in that, The color coordinate measuring device is a qualified or calibrated spectrophotometer, spectrophotometer, or tristimulus colorimeter.

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