Composite material gas cylinder leakage path detection system and method

Abstract

The invention relates to the technical field of nondestructive testing, in particular to a composite material gas cylinder leakage path detection system and method.The composite material gas cylinder is pressurized through a composite material gas cylinder high-density medium pressurization system, so that a high-density pressurization medium enters a leakage path of the composite material gas cylinder; meanwhile, a high-density pressurizing medium in the composite gas cylinder is stirred through the pressurizing medium stirring system, so that the high-density pressurizing medium can be uniformly dispersed, then the composite gas cylinder is dried through the gas cylinder drying device, and finally a dried composite gas cylinder industrial CT image is shot through the composite gas cylinder industrial CT detection device. And traversing the image to find a gas cylinder leakage path. The system and the method can realize lossless, accurate and visual detection of the leakage path of the composite material gas cylinder, obviously improve the detection efficiency while ensuring the detection safety and the result reliability, and have important engineering application value and market prospect.

Description

Technical Field

[0001] This invention relates to the field of nondestructive testing technology, and in particular to a system and method for detecting leakage paths in composite gas cylinders. Background Technology

[0002] Composite gas cylinders, as key components of modern high-pressure gas storage, typically consist of a metallic or non-metallic inner liner and an outer fully wrapped composite reinforcing layer, formed through heat curing. These cylinders are widely used in transportation, energy, and medical fields due to their lightweight and high strength. However, because they must withstand cyclical high pressure during service, leaks in the inner liner or at valve connections can easily lead to the escape of hazardous media, causing serious public safety accidents. Therefore, accurately identifying leak paths and analyzing their causes is of great significance for ensuring the safe use of gas cylinders and improving manufacturing processes.

[0003] Traditionally, in liquid pressure tests, if a gas cylinder leak is detected, the leak point can often only be inferred from the location of the seepage on the outer surface of the cylinder. However, due to the numerous interconnected layers and pores within the composite material winding layer, the leaking medium may spread along complex paths, causing a significant deviation between the surface seepage point and the actual internal leak location, leading to location failure. To determine the true leak source, existing technologies typically employ a secondary pressure test after removing the outer fiber reinforcement layer, but this method has significant drawbacks: First, the stripping process alters the stress state and distribution of the gas cylinder structure, potentially inducing new leaks at locations other than the original defects, thus failing to accurately reflect the original leak path. Second, the stripping operation is labor-intensive and costly, and the fiber debris generated during the operation can easily harm human health.

[0004] Therefore, there is an urgent need in this field for a method that can accurately and non-destructively detect and visualize leakage paths without compromising the structural integrity of composite gas cylinders. Summary of the Invention

[0005] The main objective of this invention is to overcome the shortcomings of the prior art and provide a system and method for detecting leakage paths of composite material gas cylinders.

[0006] The technical solution adopted by the present invention to achieve its technical objective is: a composite material gas cylinder leakage path detection system, including a composite material gas cylinder high-density medium pressurization system, a pressurization medium stirring system, a gas cylinder drying device, and a composite material gas cylinder industrial CT detection device. The high-density medium pressurization system of the composite material gas cylinder pressurizes the composite material gas cylinder, which contains a high-density pressurizing medium. During the pressurization process, the high-density pressurizing medium enters the leakage path of the composite material gas cylinder. The pressurizing medium stirring system is used to stir the high-density pressurizing medium in the composite material gas cylinder, so that the high-density pressurizing medium in the composite material gas cylinder can be evenly dispersed. The gas cylinder drying device dries the composite material gas cylinders that have been pressurized by a high-density pressurizing medium. The high-density media industrial CT inspection device loads the dried composite material gas cylinder and captures X-ray projection images to reconstruct industrial CT images of the gas cylinder.

[0007] Preferably, the high-density medium pressurization system for the composite material gas cylinder includes a liquid booster and a filter, wherein the liquid booster pressurizes the composite material gas cylinder through a high-pressure hose and the filter.

[0008] Preferably, the filter is a medium-pressure cup filter with a filtration accuracy of 5 μm.

[0009] Preferably, the pressurized medium stirring system includes a magnetic rotor, a magnetic actuator, and a test bench; Multiple magnetic rotors are evenly arranged inside the composite material gas cylinder; the magnetic actuator is positioned corresponding to the magnetic rotor and is fixedly mounted on the test bench. The magnetic actuator drives the magnetic rotor to stir inside the composite material gas cylinder, so that the high-density pressurized medium is evenly dispersed.

[0010] Preferably, the gas cylinder drying device includes an external drying chamber for the gas cylinder, an internal heater for the gas cylinder, and a drainage tank; The bottom of the external drying box for the gas cylinder is fixedly equipped with an internal heater for the gas cylinder, and a drainage groove is also provided at the bottom of the box. The composite material gas cylinder is inverted and fixed inside an external drying oven, and an internal heater is inserted into the composite material gas cylinder.

[0011] Preferably, the composite material gas cylinder industrial CT inspection device includes an X-ray source, a flat panel detector, a loading fixture, and a rotating platform; The loading fixture is fixedly connected to the rotating platform by bolts. The rotating platform is fixedly installed on the industrial CT inspection platform. The X-ray source and the flat panel detector are fixedly installed on both sides of the rotating platform, ensuring that they are on the same straight line as the inspection area.

[0012] Preferably, the loading fixture loads the dried composite material gas cylinder onto the rotating platform, and the composite material gas cylinder rotates once with the rotating platform. The X-ray source and flat panel detector capture X-ray projection images to reconstruct industrial CT images of the gas cylinder.

[0013] This invention also provides a method for detecting leakage paths in composite material gas cylinders, comprising the following steps: S1. Equipped with sufficient high-density pressurizing medium, filled with composite material gas cylinders that have undergone pressure resistance testing and have been found to leak. S2. Place a magnetic rotor inside the gas cylinder and connect the composite gas cylinder to the liquid booster through a high-pressure hose and filter. Then place the composite gas cylinder horizontally on the test bench and place a magnetic actuator under the composite gas cylinder. S3. Turn on the liquid booster to pressurize the composite material cylinder. At the same time, use the magnetic actuator to set up a rotating magnetic field to drive the magnetic rotor inside the cylinder to rotate, stirring the high-density pressurizing medium inside the composite material cylinder, so that the metal powder in the high-density pressurizing medium is evenly distributed inside the cylinder and concentrated and permeated at the leak point of the aluminum inner liner. S4. After the test, disconnect the composite material gas cylinder mouth and high-pressure hose, and use a liquid booster and clean water to repeatedly pressurize the pipeline 3 times to ensure that no high-density pressurizing medium remains in the pipeline, filter and liquid booster. S5. Dry the composite gas cylinder that has leaked to keep the metal powder in the high-density pressurized medium in the leak path. S6. After drying, use clean, dust-free paper to clean the inner wall of the composite gas cylinder to prevent metal powder residue from remaining on the wall surface. S7. Using a composite material cylinder loading fixture, load the dried composite material cylinder onto a rotating platform, set the scanning parameters, control the composite material cylinder to rotate one revolution with the rotating platform, and reconstruct the industrial CT image of the cylinder by taking X-ray projection images through an X-ray source and a flat panel detector. S8. Based on the fact that high-density objects have a stronger attenuation effect on X-rays, trace the areas with high gray values ​​in industrial CT images to find the leakage path of composite gas cylinders.

[0014] Preferably, the composite material gas cylinder is an aluminum-lined composite material gas cylinder or a plastic-lined composite material gas cylinder.

[0015] Preferably, the high-density pressurizing medium is a high-density metal powder suspension or a high-density solution; When the composite material gas cylinder is an aluminum-lined composite material gas cylinder, a high-density metal powder suspension is used as a high-density pressurizing medium for leak detection. When the composite material gas cylinder is a composite material gas cylinder with a plastic liner, a high-density metal powder suspension or high-density solution is used as a high-density pressurization medium for leak detection.

[0016] Among them, the high-density metal powder suspension is an ultrafine copper powder or iron powder aqueous suspension with a particle size of 5μm; the high-density solution is a saturated iodine solution, potassium nitrate solution, or Nycodenz high-density liquid.

[0017] The working principle of this composite material gas cylinder leak path detection system is as follows: First, a liquid booster pressurizes the composite material gas cylinder, which is filled with a high-density pressurizing medium, through a filter and a high-pressure hose. At the same time, a magnetic actuator drives a magnetic rotor inside the gas cylinder to stir, so that the high-density medium is evenly dispersed and seeps into the leak path of the inner liner. After pressurization, the pipeline is disassembled and cleaned with water to prevent residue. Then, the gas cylinder is placed upside down in an external drying oven and dried inside and outside by an internal heater. Residual liquid is discharged through a drain tank. After drying, the inner wall is cleaned, and then the gas cylinder is fixed on a rotating platform using a loading clamp. An X-ray image of one rotation is captured by an X-ray source and a flat panel detector, and an industrial CT image is reconstructed. Finally, the leak path is identified based on the high grayscale area.

[0018] Compared with the prior art, the beneficial effects of the present invention are: This composite material gas cylinder leakage path detection system and method employs a non-destructive approach. The invention eliminates the need to remove the external composite material winding layer of the gas cylinder, fully preserving the integrity of the cylinder structure. This avoids changes in stress state and secondary damage caused by delamination, ensuring the authenticity of the leakage path and the reliability of the detection results.

[0019] This composite material gas cylinder leak path detection system and method can achieve high-precision positioning and visual detection. By filling the gas cylinder with a high-density pressurized medium of a specific formula and allowing it to penetrate the leak path under pressurized conditions, the high-density material significantly attenuates X-rays, forming a distinct high-grayscale contrast area in the CT image. This enables clear and accurate three-dimensional visualization of the entire leak path, achieving full-process tracking from the inner liner defect point to the outer surface.

[0020] This composite material gas cylinder leak path detection system and method is highly adaptable and has a wide range of applications. For composite material gas cylinders with different inner liner materials, such as aluminum and plastic, suitable high-density medium systems have been designed to ensure sufficient density difference and imaging contrast in different material systems, demonstrating the method's versatility.

[0021] This composite material gas cylinder leak path detection system and method is safe to operate and highly efficient. The integrated pressurization system, magnetic stirring system, drying device, and CT detection device enable streamlined operation, avoiding the health risks and time consumption associated with manual delamination. Simultaneously, the system's filters effectively protect the pressurization equipment, and the cleaning process ensures no media residue remains. The overall method is safe, efficient, and easy to implement.

[0022] The composite material gas cylinder leakage path detection system and method can provide direct basis for process improvement, accurately reveal the origin and expansion path of leakage, and provide direct and reliable technical support for in-depth analysis of leakage mechanism, location of production or material defects, and optimization of gas cylinder design and manufacturing process. Attached Figure Description

[0023] Figure 1 A schematic diagram of a composite material gas cylinder pressurized with a high-density medium.

[0024] Figure 2 Schematic diagram of high-density pressurized medium display principle for leakage path of composite gas cylinder.

[0025] Figure 3 A schematic diagram of the composite material gas cylinder under drying conditions.

[0026] Figure 4 Schematic diagram of industrial CT detection principle for leakage paths of composite material gas cylinders.

[0027] Figure 5 Flowchart of the operation steps for detecting leakage paths in composite material gas cylinders.

[0028] in: 1-Liquid booster; 2-Filter; 3-High-pressure hose; 4-Composite gas cylinder; 5-Magnetic rotor; 6-Magnetic actuator; 7-Test bench; 8-Winding layer; 9-Inner liner; 10-High-density boosting medium; 11-Leakage path; 12-External drying oven for gas cylinder; 13-Internal heater for gas cylinder; 14-Drainage tank; 15-X-ray source; 16-Flat panel detector; 17-Loading fixture; 18-Rotating platform. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0030] In the description of this invention, it should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to the other element.

[0031] In the description of this invention, it should be noted that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0032] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example 1:

[0033] Please see Figures 1-4 A composite material gas cylinder leakage path detection system is applied to composite material gas cylinders with aluminum or plastic liners. It is based on industrial CT detection using high-density metal powder suspension or high-density solution, and achieves this by improving the grayscale contrast of CT images through high-density materials.

[0034] The high-density metal powder suspension is an aqueous suspension of ultrafine copper or iron powder with a particle size of 5 μm. The high-density solution is a saturated iodine solution, potassium nitrate solution, or Nycodenz high-density liquid.

[0035] When the composite material gas cylinder 4 is an aluminum-lined composite material gas cylinder, a high-density metal powder suspension is used as the high-density pressurizing medium 10 for leak detection. When the composite material gas cylinder 4 is a composite material gas cylinder with a plastic inner liner, a high-density metal powder suspension or high-density solution is used as the high-density pressurization medium 10 for leak detection.

[0036] The composite material gas cylinder leakage path detection system includes a high-density medium pressurization system for composite material gas cylinders, a pressurization medium stirring system, a gas cylinder drying device, and an industrial CT detection device for composite material gas cylinders.

[0037] Furthermore, in this embodiment, specifically as follows: Figure 1 , Figure 2 As shown, the high-density medium pressurization system of the composite gas cylinder pressurizes the composite gas cylinder 4. The outer part of the composite gas cylinder 4 is a winding layer 8, and the inside contains a high-density pressurization medium 10. During the pressurization process, the high-density pressurization medium 10 enters the leakage path 11 of the inner liner 9 of the composite gas cylinder 4.

[0038] The high-density medium pressurization system for composite material gas cylinders includes a liquid booster 1 and a filter 2. The working medium of the liquid booster 1 is water, which is pressurized into the composite material gas cylinder 4 through a high-pressure hose 3 and the filter 2.

[0039] Filter 2 is a medium-pressure cup-shaped filter with a filtration accuracy of 5μm. It can effectively prevent metal powder in the high-density pressurizing medium 10 in the composite gas cylinder 4 from flowing back into the liquid pressurizer 1 during the pressurization process, and is used to protect the liquid pressurizer 1.

[0040] Furthermore, in this embodiment, specifically as follows: Figure 1 , Figure 2 As shown, the pressurizing medium stirring system stirs the high-density pressurizing medium 10 inside the composite material gas cylinder 4, so that the high-density pressurizing medium 10 inside the composite material gas cylinder 4 can be uniformly dispersed.

[0041] The pressurized medium stirring system includes a magnetic rotor 5, a magnetic actuator 6, and a test bench 7. Multiple magnetic rotors 5 are arranged evenly inside the composite gas cylinder 4 according to the length of the cylinder body. The magnetic actuator 6 is positioned corresponding to the magnetic rotor 5 and is fixedly installed on the test bench 7. By placing the composite gas cylinder 4 horizontally on the test bench 7 and driving the magnetic actuator 6, the magnetic rotor 5 stirs the suspension inside the composite gas cylinder 4, ensuring that the metal powder in the high-density pressurized medium 10 inside the composite gas cylinder 4 can be evenly dispersed. The high-density pressurized medium 10 evenly distributed inside the composite gas cylinder 4 enters the leakage path 11 of the inner liner 9 of the composite gas cylinder 4 during the pressurization process.

[0042] Furthermore, in this embodiment, specifically as follows: Figure 3 As shown, the gas cylinder drying device inverts and fixes the composite material gas cylinder 4, which has been pressurized by the high-density pressurizing medium 10, to dry the inside and outside of the composite material gas cylinder 4.

[0043] The gas cylinder drying device includes an external drying chamber 12, an internal heater 13, and a drainage trough 14. The internal heater 13 is fixedly installed at the bottom of the external drying chamber 12, and a drainage trough 14 is also provided at the bottom. The composite material gas cylinder 4 is placed upside down and fixed inside the external drying chamber 12, with the internal heater 13 inserted into the interior of the composite material gas cylinder 4. The external drying chamber 12 and the internal heater 13 simultaneously dry the composite material gas cylinder 4 from the inside and outside. The residual medium inside the cylinder is discharged from the drainage trough 14 to prevent residual liquid inside the composite material gas cylinder 4 from affecting the subsequent industrial CT test results.

[0044] It should be noted that after the gas cylinder is dried, there will be separated high-density metal powder or high-density solute in the leakage path 11.

[0045] Furthermore, in this embodiment, specifically as follows: Figure 4 As shown, the high-density media industrial CT inspection device loads the dried composite material gas cylinder 4 and takes X-ray projection images to reconstruct the industrial CT image of the gas cylinder.

[0046] The industrial CT inspection device for composite material gas cylinders includes an industrial CT inspection platform, an X-ray source 15, a flat panel detector 16, a loading fixture 17, and a rotating platform 18. The loading fixture 17 is fixedly connected to the rotating platform 18 by bolts. The rotating platform 18 is fixedly installed on the industrial CT inspection platform. The X-ray source 15 and the flat panel detector 16 are fixedly installed on both sides of the rotating platform, ensuring that they are on the same straight line as the inspection area. The dried composite material gas cylinder 4 is loaded onto the rotating platform 18 through the loading fixture 17. The scanning parameters are set, and the composite material gas cylinder 4 is controlled to rotate one revolution with the rotating platform 18. The X-ray projection image is captured by the X-ray source 15 and the flat panel detector 16 to reconstruct the industrial CT image of the gas cylinder.

[0047] Specifically, in use, the pressure is first applied through a pressurization system consisting of a liquid booster 1 and a filter 2, via a high-pressure hose 3, to the interior of a composite gas cylinder 4 that has been pre-filled with high-density pressurizing medium 10.

[0048] During the pressurization process, a stirring system consisting of a magnetic actuator 6 and a magnetic rotor 5 is simultaneously activated. The magnetic actuator 6 drives multiple magnetic rotors 5 placed inside the gas cylinder to rotate, so that the high-density pressurization medium 10 is evenly dispersed and causes it to seep into the leakage path 11 of the composite material gas cylinder liner 9 under pressure.

[0049] After the pressurization and permeation processes are completed, disconnect the connection and repeatedly flush the pipeline with liquid booster 1 and clean water to ensure that there is no media residue in the high-pressure hose 3, filter 2 and liquid booster 1.

[0050] Subsequently, the gas cylinder is inverted and fixed inside the external drying chamber 12, and the internal heater 13 is inserted to dry the cylinder inside and out. Residual liquid is discharged through the drain trough 14, causing the metal powder or high-density solute in the leakage path 11 to solidify and remain. After drying, the inner wall of the gas cylinder is cleaned with lint-free paper.

[0051] Finally, the processed gas cylinder is installed on the rotating platform 18 using the loading fixture 17. In the composite material gas cylinder industrial CT inspection device, the gas cylinder is controlled to rotate one revolution with the rotating platform 18. The X-ray source 15 and the flat panel detector 16 are used to collect projected images and reconstruct the industrial CT three-dimensional image of the gas cylinder. By identifying the high grayscale area formed by the accumulation of high-density materials in the image, the complete leakage path 11 of the composite material gas cylinder 4 can be accurately located and displayed. Example 2:

[0052] Please see Figure 5 Based on the above embodiments, the present invention also provides a method for detecting leakage paths in composite material gas cylinders. This embodiment uses an aqueous suspension of ultrafine copper powder with a diameter of 5μm as the pressurizing medium, and combines it with an industrial CT detection system to detect leakage paths 11 in composite material gas cylinders 4 with aluminum liners. The specific steps include: S1. Using ultrafine copper powder with a diameter of 5μm, a sufficient amount of high-density pressurizing medium 10 is prepared and filled into a composite gas cylinder 4 with an aluminum inner liner that has leaked after a pressure resistance test. S2. Place a magnetic rotor 5 inside the gas cylinder, and connect the composite gas cylinder 4 to the liquid booster 1 through the high-pressure hose 3 and the filter 2. Then place the composite gas cylinder 4 horizontally on the test bench 7, and place a magnetic actuator 6 under the composite gas cylinder 4. S3. Turn on the liquid booster 1 to pressurize the composite material cylinder 4. At the same time, use the magnetic driver 6 to set up a rotating magnetic field to drive the magnetic rotor 5 inside the cylinder to rotate and stir the high-density pressurizing medium 10 inside the composite material cylinder 4, so that the metal powder of the high-density pressurizing medium 10 is evenly distributed inside the cylinder and concentrated and permeated at the leakage point of the aluminum inner liner. S4. After the test, disconnect the connection between the mouth of the composite gas cylinder 4 and the high-pressure hose 3, and use the liquid booster 1 and clean water to repeatedly pressurize the pipeline 3 times to ensure that no high-density pressurizing medium 10 remains in the pipeline, filter 2 and liquid booster 1. S5. Dry the composite gas cylinder 4 where the leak occurred so that the metal powder of the high-density pressurized medium 10 is retained in the leakage path 11. S6. After drying, clean the inner wall of the composite gas cylinder 4 with clean, dust-free paper to prevent metal powder residue from remaining on the wall surface. S7. Using the composite material gas cylinder loading fixture 17, the dry composite material gas cylinder 4 is loaded onto the rotating platform 18. The scanning parameters are set, and the composite material gas cylinder 4 is controlled to rotate one revolution with the rotating platform 18. The X-ray projection image is captured by the X-ray source 15 and the flat panel detector 16 to reconstruct the industrial CT image of the gas cylinder. S8. Based on the fact that high-density objects have a stronger attenuation effect on X-rays, trace the areas with higher gray values ​​in the industrial CT image to find the leakage path 11 of the composite gas cylinder 4.

[0053] The solution in this embodiment can be selectively combined with solutions in other embodiments. Example 3:

[0054] Please see Figure 5 Based on the above embodiments, the present invention also provides a method for detecting leakage paths in composite material gas cylinders. This embodiment uses saturated Nycodenz high-density liquid as the pressurizing medium, and combines it with an industrial CT detection system to detect leakage paths 11 in a composite material gas cylinder 4 with a nylon inner liner. Specifically, it includes the following steps: S1. Using Nycodenz, prepare a sufficient amount of saturated high-density pressurizing medium 10, and fill the composite gas cylinder 4 with the high-density pressurizing medium 10 solution. Connect the composite gas cylinder 4 to the liquid pressurizer 1 through the high-pressure hose 3. S2. Turn on the liquid booster 1 to pressurize the composite gas cylinder 4. When the gas cylinder leaks, the high-density pressurizing medium 10 will concentrate and permeate at the leak point in the plastic inner liner and enter the leak path 11. S3. After the test, disconnect the connection between the bottle mouth of the composite gas cylinder 4 and the high-pressure hose 3, and use the liquid booster 1 and clean water to repeatedly pressurize the pipeline 3 times to ensure that no high-density pressurizing medium 10 remains in the pipeline, filter 2 and liquid booster 1. S4. The composite gas cylinder 4 that leaked during the pressure test is dried. The high-density pressurizing medium 10 precipitates solid Nycodenz with a density much higher than that of the plastic inner liner of the composite gas cylinder 4 in the leakage path 11. S5. Use clean, lint-free paper to clean the inner wall of the gas cylinder to prevent solute residue from remaining on the wall surface. S6. Load the dried composite material gas cylinder 4 onto the rotating platform 18, set the scanning parameters, control the gas cylinder to rotate one revolution with the rotating platform 18, and take X-ray projection images to reconstruct the industrial CT image of the gas cylinder. S7. Based on the fact that high-density objects have a stronger attenuation effect on X-rays, trace the areas with higher gray values ​​in the industrial CT image of the inner liner of composite gas cylinder 4 to find the leakage path 11 of composite gas cylinder 4.

[0055] The solution in this embodiment can be selectively combined with solutions in other embodiments.

[0056] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection of this invention. Therefore, any changes and modifications made to the embodiments described herein based on the innovative concept of this invention, or equivalent structural, procedural, or functional transformations made using the description and drawings of this invention, directly or indirectly applying the above technical solutions to other related technical fields, are all included within the scope of protection of this invention.

Claims

1. A composite material gas cylinder leakage path detection system, characterized in that: This includes a high-density medium pressurization system for composite material gas cylinders, a pressurization medium stirring system, a gas cylinder drying device, and an industrial CT inspection device for composite material gas cylinders; The high-density medium pressurization system of the composite gas cylinder pressurizes the composite gas cylinder (4), which contains a high-density pressurization medium (10). During the pressurization process, the high-density pressurization medium (10) enters the leakage path (11) of the composite gas cylinder (4). The pressurizing medium stirring system is used to stir the high-density pressurizing medium (10) inside the composite material gas cylinder (4), so that the high-density pressurizing medium (10) inside the composite material gas cylinder (4) can be uniformly dispersed; The gas cylinder drying device dries the composite material gas cylinder (4) after it has been pressurized by the high-density pressurizing medium (10); The composite material gas cylinder industrial CT inspection device loads the dried composite material gas cylinder (4) and takes X-ray projection images to reconstruct the gas cylinder industrial CT image.

2. The composite material gas cylinder leakage path detection system according to claim 1, characterized in that: The high-density medium pressurization system of the composite gas cylinder includes a liquid booster (1) and a filter (2). The liquid booster (1) pressurizes the composite gas cylinder (4) through a high-pressure hose (3) and the filter (2).

3. The composite material gas cylinder leakage path detection system according to claim 2, characterized in that: The filter (2) is a medium-pressure cup-shaped filter with a filtration accuracy of 5μm.

4. The composite material gas cylinder leakage path detection system according to claim 1, characterized in that: The pressurized medium stirring system includes a magnetic rotor (5), a magnetic actuator (6), and a test bench (7). Multiple magnetic rotors (5) are evenly arranged inside the composite gas cylinder (4); the magnetic actuator (6) is positioned corresponding to the magnetic rotors (5) and is fixedly installed on the test bench (7); The magnetic actuator (6) drives the magnetic rotor (5) to stir inside the composite gas cylinder (4), so that the high-density pressurized medium (10) is evenly dispersed.

5. The composite material gas cylinder leakage path detection system according to claim 1, characterized in that: The gas cylinder drying device includes an external drying box (12), an internal heater (13), and a drainage trough (14). The bottom of the external drying box (12) for the gas cylinder is fixedly installed with an internal heater (13) for the gas cylinder, and a drainage groove (14) is also provided at the bottom. The composite gas cylinder (4) is inverted and fixed inside the external drying box (12), and the internal heater (13) is inserted into the composite gas cylinder (4).

6. The composite material gas cylinder leakage path detection system according to claim 1, characterized in that: The high-density media industrial CT inspection device includes an X-ray source (15), a flat panel detector (16), a loading fixture (17), and a rotating platform (18). The loading fixture (17) is fixedly connected to the rotating platform (18) by bolts. The rotating platform (18) is fixedly installed on the industrial CT detection platform. The X-ray source (15) and the flat panel detector (16) are fixedly installed on both sides of the rotating platform, ensuring that they are on the same straight line as the detection area.

7. The composite material gas cylinder leakage path detection system according to claim 6, characterized in that: The loading fixture (17) loads the dried composite gas cylinder (4) onto the rotating platform (18). The composite gas cylinder (4) rotates once with the rotating platform (18). The X-ray source (15) and the flat panel detector (16) capture X-ray projection images to reconstruct industrial CT images of the gas cylinder.

8. A method for detecting leakage paths in composite material gas cylinders using the detection system as described in any one of claims 1-7, characterized in that, Includes the following steps: S1. Equipped with sufficient high-density pressurizing medium (10), and filled with composite gas cylinders (4) that have leaked after pressure resistance test. S2. Place a magnetic rotor (5) inside the gas cylinder and connect the composite gas cylinder (4) to the liquid booster (1) through a high-pressure hose (3) and a filter (2). Then place the composite gas cylinder (4) horizontally on the test bench (7) and place a magnetic actuator (6) under the composite gas cylinder (4). S3. Turn on the liquid booster (1) to pressurize the composite gas cylinder (4). At the same time, use the magnetic driver (6) to arrange a rotating magnetic field to drive the magnetic rotor (5) inside the gas cylinder to rotate and stir the high-density pressurizing medium (10) inside the composite gas cylinder (4), so that the metal powder of the high-density pressurizing medium (10) is evenly distributed inside the gas cylinder and concentrated and permeated at the leak point of the aluminum inner liner. S4. After the test, disconnect the gas cylinder (4) and the high-pressure hose (3) from the composite material cylinder. Use the liquid booster (1) and clean water to pressurize the pipeline three times to ensure that no high-density pressurizing medium (10) remains in the pipeline, filter (2) and liquid booster (1). S5. The composite gas cylinder (4) that has leaked is dried so that the metal powder of the high-density pressurized medium (10) is retained in the leakage path (11). S6. After drying, clean the inner wall of the composite gas cylinder (4) with clean, dust-free paper to prevent metal powder residue on the wall surface. S7. Using the composite material cylinder loading fixture (17), the dry composite material cylinder (4) is loaded onto the rotating platform (18). The scanning parameters are set, and the composite material cylinder (4) is controlled to rotate one revolution with the rotating platform (18). The X-ray projection image is captured by the X-ray source (15) and the flat panel detector (16) to reconstruct the industrial CT image of the cylinder. S8. Based on the fact that high-density objects have a stronger attenuation effect on X-rays, we traverse the areas with high gray values ​​in the industrial CT image to find the leakage path (11) of the composite gas cylinder (4).

9. The composite material gas cylinder leakage path detection system according to claim 8, characterized in that, The composite material gas cylinder (4) is an aluminum-lined composite material gas cylinder or a plastic-lined composite material gas cylinder.

10. The method for detecting leakage paths in a composite material gas cylinder according to claim 8, characterized in that, The high-density pressurizing medium (10) is a high-density metal powder suspension or a high-density solution.

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