Tangential transillumination detection system and method for fiber-wound gas cylinder

Abstract

The invention discloses a tangential transillumination detection system for a fiber-wound gas cylinder, and relates to the technical field of fiber-wound gas cylinder detection.The tangential transillumination detection system comprises a detection mechanism and a compensation block, the detection mechanism comprises a radiation source and a detector, and the radiation source and the detector are arranged on the two sides of the fiber-wound gas cylinder respectively; the radiation source can emit detection rays to perform transillumination on a to-be-detected part of the fiber-wound gas cylinder, and the detector can receive the transilluminated detection rays so as to detect the fiber-wound gas cylinder; an arc-shaped surface is arranged on the compensation block and is used for being attached to a to-be-detected part of the fiber-wound gas cylinder; wherein in the transillumination interval of the detection rays, the transillumination thickness of the detection rays is the same by arranging the compensation block. The invention further provides a tangential transillumination detection method for the fiber-wound gas cylinder. The tangential transillumination detection method is implemented by adopting the tangential transillumination detection system for the fiber-wound gas cylinder. According to the invention, the detection efficiency can be improved, the obtained image is obvious and clear, and the imaging quality is good.

Description

Technical Field

[0001] The invention relates to the technical field of tangential transillumination detection of filament wound gas cylinders, and in particular to a tangential transillumination detection system and method for filament wound gas cylinders. Background Art

[0002] Fiber-wound gas cylinders are mainly used for the storage and transportation of high-pressure gases such as hydrogen and natural gas. The bottle body consists of an inner liner and a fiber-wound layer. The inner liner material is usually steel, aluminum or plastic, and the winding layer material is carbon fiber or glass fiber.

[0003] During the service life of fiber-wound gas cylinders, due to traffic accidents, bumps and vibrations, the fiber-wound layers may suffer impact damage, fiber breakage, fiber delamination, debonding and other damages. At the same time, fiber-wound gas cylinders may also suffer from defects such as fiber delamination and debonding due to poor roundness of the inner liner and imperfect processes during the manufacturing process. In order to ensure the safe operation of fiber-wound gas cylinders, effective non-destructive testing methods are required to inspect the above defects; among them, X-ray digital imaging detection method (DR, Digital radiography) has a good effect on defect detection of fiber-wound gas cylinders.

[0004] When using the DR method to detect fiber-wrapped gas cylinders, it can be divided into vertical and tangential transillumination according to different transillumination methods, such as Figure 1 and Figure 2 As shown in the figure, vertical penetration is a common penetration method in X-ray detection methods. It can be used to detect defects such as scratches on the winding layer, fiber breakage and cracks in the liner, but it is not suitable for the detection of defects such as fiber delamination and debonding. In order to effectively detect defects such as fiber delamination and debonding, tangential penetration is required.

[0005] When performing tangential transillumination DR testing on fiber-wound gas cylinders, the X-ray penetration thickness at different test locations along the radial direction of the gas cylinder is different due to the presence of a certain curvature of the gas cylinder. Figure 3 As shown, Figure 3 T1, T2, and T3 are the X-ray penetration thicknesses of different detection parts. The penetration thickness will directly affect the grayscale of the image obtained by DR detection. The grayscale value of the image is higher in the part with smaller penetration thickness, and the grayscale value of the image is lower in the part with larger penetration thickness.

[0006] Grayscale value is an important indicator for judging the quality of DR inspection images. High or low grayscale values ​​will affect the effective detection of defects. NB / T 47013.11-2023 "Nondestructive Testing of Pressure Equipment Part 11: Radiographic Digital Imaging Inspection" also has clear requirements for the grayscale value of DR inspection images. Therefore, in order to effectively detect defects during tangential penetration, it is necessary to solve the problem of large differences in image grayscale values ​​caused by different penetration thicknesses in different parts of fiber-wrapped gas cylinders.

[0007] In order to reduce the impact of large grayscale value differences on image quality, batch transillumination is currently usually used, that is, several groups of different transillumination energies are used to perform tangential transillumination inspection on the same part of the fiber-wound gas cylinder, so that the parts with different penetration thicknesses can all achieve appropriate image grayscale. Although this method can solve the problem of large differences in image grayscale values ​​of different parts to a certain extent, it increases the inspection workload exponentially. For continuous defects, it is necessary to compare and observe in several images, which is cumbersome. According to the actual test results, the image obtained by this method is relatively blurred and the imaging quality is poor. This is because when performing tangential transillumination, the surface of the gas cylinder is arc-shaped, and the scattered rays have a significant impact on the inspection results. Summary of the invention

[0008] The purpose of the present invention is to provide a fiber-wound gas cylinder tangential transillumination detection system and method to solve the problems existing in the above-mentioned prior art, improve the detection efficiency, and obtain clear images with good imaging quality.

[0009] To achieve the above object, the present invention provides the following solutions:

[0010] The present invention provides a fiber-wound gas cylinder tangential transillumination detection system, comprising:

[0011] A detection mechanism, the detection mechanism comprising a ray source and a detector, the ray source and the detector are respectively used to be arranged on both sides of the fiber-wound gas cylinder, the ray source can emit detection rays to transilluminate the to-be-detected part of the fiber-wound gas cylinder, and the detector can receive the transilluminated detection rays to detect defects on the fiber-wound gas cylinder;

[0012] A compensation block is provided with a curved surface, and the curved surface is used to fit the part to be inspected of the fiber-wound gas cylinder; wherein, in the penetration range of the detection ray, the side surfaces of the compensation block along the penetration direction of the detection ray are perpendicular to the detection ray, and the penetration thickness of the detection ray is the same.

[0013] Preferably, it also includes a rotating mechanism, which is used to place the fiber-wound gas cylinder and can make the fiber-wound gas cylinder rotate around its axis on the rotating mechanism; wherein the rotating mechanism includes two groups of rotatable support rollers arranged side by side, and the fiber-wound gas cylinder is placed between the two groups of support rollers.

[0014] Preferably, a scattered-ray shielding device is provided between the ray source and the fiber-wound gas cylinder and between the fiber-wound gas cylinder and the detector.

[0015] Preferably, when defects of the fiber-wound layer of the fiber-wound gas cylinder are detected, on the cross section of the compensation block, a line connecting two sides of the opening end of the compensation block is tangent to the outer circle of the inner liner of the fiber-wound gas cylinder;

[0016] When inspecting defects of the inner liner of the fiber-wound gas cylinder, on the cross section of the compensation block, a line connecting two sides of the opening end of the compensation block is tangent to the inner circle of the inner liner of the fiber-wound gas cylinder.

[0017] Preferably, margin surfaces are provided on both sides of the opening end of the compensation block.

[0018] Preferably, the compensation block is made of a material that matches the density of the inner liner or the fiber winding layer of the fiber wound gas cylinder.

[0019] Preferably, it further comprises a fluid layer, and the fluid layer can be filled between the compensation block and the fiber-wound gas cylinder.

[0020] Preferably, the radiation source is a DR device, the focal diameter of the DR device is not greater than 1 mm, and the maximum transillumination voltage is not less than 200 kV;

[0021] The detector is a flat panel detector, and the pixel size of the detector is 50 μm-100 μm.

[0022] The present invention also provides a tangential transillumination detection method for a fiber-wound gas cylinder, which is implemented by using the tangential transillumination detection system for a fiber-wound gas cylinder as described above, and comprises the following steps:

[0023] S1. Turn the part of the fiber-wrapped gas cylinder to be tested upward, and attach the compensation block to the part to be tested;

[0024] S2. Detecting the part to be detected by the detection mechanism.

[0025] Preferably, before step S1, the method further comprises the following steps:

[0026] S101, designing the compensation block;

[0027] S102, selecting the material of the compensation block;

[0028] S103, processing the compensation block;

[0029] S104, selecting the testing agency;

[0030] S105, arranging the fiber-wound gas cylinder tangential transillumination detection system;

[0031] After step S2, the method further comprises the following steps:

[0032] S201, image post-processing, post-processing the detection image obtained in step S2 to observe defect features.

[0033] Compared with the prior art, the present invention has achieved the following technical effects:

[0034] The present invention is provided with a compensation block, on which an arc-shaped surface is arranged, which can be fitted with the part to be inspected of the fiber-wound gas cylinder, and in the penetration range of the detection ray, the thickness of the compensation block along the penetration direction of the detection ray is the same, and when tangential penetration is performed, the penetration thickness of the detection ray at different positions of the part to be inspected is the same, so that the detection of one part to be inspected can be completed by one penetration, and all defects in the same part to be inspected can be observed in one image, thereby greatly improving the detection efficiency.

[0035] Moreover, the two side surfaces of the compensation block along the transmission direction of the detection ray are perpendicular to the detection ray, and the scattered rays have little effect on the detection result. The obtained image is obviously clear and the imaging quality is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 It is a schematic diagram of vertical transillumination;

[0038] Figure 2 This is a schematic diagram of tangential transillumination;

[0039] Figure 3 This is a schematic diagram of penetration thickness at different parts during tangential transillumination;

[0040] Figure 4 It is a structural schematic diagram of a tangential transillumination detection system for a fiber-wound gas cylinder according to an embodiment of the present invention;

[0041] Figure 5 Schematic diagram of the preliminary design of the compensation block in the embodiment of the present invention;

[0042] Figure 6 The schematic diagram of the dimensions of the compensation block for the preliminary design;

[0043] Figure 7 A schematic diagram of a compensation block correction design in an embodiment of the present invention;

[0044] Figure 8 A schematic diagram of the dimensions of the corrected compensation block;

[0045] Fig. 9 Schematic diagram of the design of a compensation block for a Type IV fiber-wound gas cylinder in an embodiment of the present invention;

[0046] Fig.10 Schematic diagram of the gap caused by the non-round bottle body;

[0047] Fig.11 Schematic diagram of the gap caused by the depression of the bottle body;

[0048] Fig.12 This is a schematic diagram of the structure of a compensation block with a fluid layer in an embodiment of the present invention;

[0049] Fig.13 for Fig.12 Schematic diagram of the top surface of the compensation block.

[0050] In the figure: 1-ray source; 2-X-ray; 3-compensation block; 301-top surface; 4-defect; 5-detector; 6-inner liner; 7-fiber winding layer; 8-support roller; 9-fluid layer; 100-fiber winding gas cylinder; 101-gap; 102-depression. DETAILED DESCRIPTION

[0051] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0052] The purpose of the present invention is to provide a fiber-wound gas cylinder tangential transillumination detection system and method to solve the problems existing in the above-mentioned prior art, improve the detection efficiency, and obtain clear images with good imaging quality.

[0053] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0054] Embodiment 1

[0055] like Figure 4-Figure 13 As shown, this embodiment provides a tangential transillumination detection system for a fiber-wound gas cylinder, which mainly includes:

[0056] A detection mechanism, the detection mechanism comprising a ray source 1 and a detector 5, the ray source 1 and the detector 5 are respectively used to be arranged on both sides of the filament wound gas cylinder 100, the ray source 1 can emit detection rays to transilluminate the to-be-detected part of the filament wound gas cylinder 100, and the detector 5 can receive the transilluminated detection rays to realize the detection of the defect 4 on the filament wound gas cylinder 100;

[0057] A compensation block 3 is provided with an arcuate surface, and the arcuate surface is used to fit with the part to be detected of the fiber-wound gas cylinder 100; wherein the compensation block 3 is a rectangular parallelepiped structure as a whole, and in the penetration interval of the detection ray, the thickness of the compensation block 3 along the penetration direction of the detection ray is the same (that is, the width is the same), and the side surfaces of the compensation block 3 on both sides along the penetration direction of the detection ray are perpendicular to the detection ray.

[0058] Furthermore, it needs to be explained that Figure 4 As shown, the two side surfaces of the compensation block 3 along the irradiation direction of the detection ray refer to the left side surface and the right side surface of the compensation block 3 .

[0059] In the present embodiment, a compensation block 3 is provided, and an arc-shaped surface is provided on the compensation block 3, which can fit with the part to be inspected of the fiber-wound gas cylinder 100, and in the penetration range of the detection ray, the thickness of the compensation block 3 along the penetration direction of the detection ray is the same. When tangential penetration is performed, the penetration thickness of the detection ray at different positions of the part to be inspected is the same, so that the detection of one part to be inspected can be completed by one penetration, and all defects 4 in the same part to be inspected can be observed in one image, thereby greatly improving the detection efficiency.

[0060] Moreover, the side surfaces of the compensation block 3 along the transillumination direction of the detection ray are perpendicular to the detection ray, so the scattered rays have little influence on the detection result, and the obtained image is obviously clear and has good imaging quality.

[0061] Furthermore, it needs to be explained that when detecting the defect 4 on the fiber-wound gas cylinder 100, it is necessary to rotate the part to be detected to the top and make the compensation block 3 fit the part to be detected with the opening facing downward; wherein, due to the different types of fiber-wound gas cylinders 100, the above-mentioned defect 4 can be a defect 4 on the inner liner 6 or the fiber-wound layer 7.

[0062] In this embodiment, a rotating mechanism is also included, on which the fiber-wound gas cylinder 100 is placed, and the fiber-wound gas cylinder 100 can be rotated around its axis on the rotating mechanism; the rotating mechanism provided in this embodiment can facilitate the rotation of the fiber-wound gas cylinder 100, thereby facilitating the rotation of the part to be inspected to the top, or inspecting different parts to be inspected.

[0063] Among them, as a preferred embodiment, the rotating mechanism includes two groups of rotatable supporting rollers 8 arranged side by side, and the fiber-wound gas cylinder 100 is placed between the two groups of supporting rollers 8; alternatively, other methods can be used to lay the fiber-wound gas cylinder 100 flat, but it is necessary to ensure that the fiber-wound gas cylinder 100 can rotate within a certain range.

[0064] In this embodiment, a scattered light shielding device is further provided between the radiation source 1 and the fiber-wound gas cylinder 100 and between the fiber-wound gas cylinder 100 and the detector 5 to further reduce the influence of scattered light on the detection result; wherein, the scattered light shielding device is a mature prior art in this field and can be selected according to specific work needs, and will not be described in detail in this embodiment.

[0065] In this embodiment, on the cross section of the compensation block 3, the connecting line on both sides of the open end of the compensation block 3 is tangent to the outer circle or the inner circle of the inner liner 6 of the fiber-wound gas cylinder 100; specifically, when the defect 4 of the fiber-wound layer 7 of the fiber-wound gas cylinder 100 is detected, the connecting line on both sides of the open end of the compensation block 3 is tangent to the outer circle of the inner liner 6 of the fiber-wound gas cylinder 100; and for type IV fiber-wound gas cylinders, if it is necessary to detect the defect 4 of the plastic inner liner, the connecting line on both sides of the open end of the compensation block 3 is tangent to the inner circle of the inner liner 6 of the fiber-wound gas cylinder 100.

[0066] In this embodiment, margin surfaces are provided on both sides of the open end of the compensation block 3 to facilitate the processing and use of the compensation block 3; it should be noted that the width of the margin surface cannot be too large, because the margin surface will increase the width of the compensation block 3, and a larger transillumination energy is required during detection; as a preferred implementation, the width of the margin surfaces on both sides is about 10 mm, and the width of the margin surface can be adjusted as needed.

[0067] In this embodiment, the compensation block 3 is made of a material that is similar in density to the inner liner 6 or the fiber winding layer 7 of the fiber winding gas cylinder 100 and is easy to process; specifically, the density of glass fiber (containing resin) is about 2.1 g / cm 3 When testing the fiber winding layer 7 of the glass fiber wound gas cylinder, aluminum, polytetrafluoroethylene, etc. can be selected. For example, the density of carbon fiber (containing resin) is about 1.4g / cm 3 When testing the fiber winding layer 7 of the carbon fiber wound gas cylinder, nylon or the like can be selected. When testing the inner liner 6 of the type IV fiber wound gas cylinder, the same material as the inner liner 6 can be directly selected.

[0068] In the present embodiment, a fluid layer 9 is also included, and the fluid layer 9 can be filled between the compensation block 3 and the fiber-wound gas cylinder 100; specifically, when the fiber-wound gas cylinder 100 has a gap 101 with the compensation block 3 due to insufficient roundness, the fluid layer 9 can be used to fill the gap 101; when the fiber-wound gas cylinder 100 has a depression 102 due to impact, the fluid layer 9 can be used to fill the depression 102. Among them, when the fiber-wound gas cylinder 100 has a gap 101 due to insufficient roundness of the bottle body, or a depression 102 is formed at the detection part due to impact, the area close to the outer surface of the fiber-wound layer 7 is often difficult to observe due to excessive difference in grayscale value. This is because there is a certain gap between the outer surface of the bottle body and the compensation block 3, resulting in excessive difference in transillumination thickness. Fig.10 , Fig.11 Therefore, a fluid layer 9 is added on the arc surface of the compensation block 3, as shown Fig.12 As shown, the material of the fluid layer 9 should be selected to have a density close to that of the object to be detected, such as clay, water, etc. When in use, appropriate pressure should be applied to the top surface 301 of the compensation block 3 to ensure that the fluid layer 9 can fully fill the gap 101 or the recess 102.

[0069] In this embodiment, the ray source 1 is preferably a DR device, and the detection ray emitted by it is an X-ray 2; the maximum transillumination energy of the DR device is determined by referring to the width and material of the compensation block 3. In order to ensure a higher detection sensitivity, a DR device with a smaller focal spot size should be selected under the premise of ensuring the transillumination energy; as a preferred implementation, the focal spot diameter of the DR device is not greater than 1 mm, and the maximum transillumination voltage is not less than 200 kV;

[0070] The detector 5 is preferably a flat panel detector with a relatively small pixel size. As a preferred implementation, the pixel size of the detector 5 is 50 μm or 100 μm.

[0071] Embodiment 2

[0072] This embodiment provides a tangential transillumination detection method for a filament-wound gas cylinder, which is implemented using the tangential transillumination detection system for a filament-wound gas cylinder as described above, and mainly includes the following steps:

[0073] S1. Turn the part of the fiber-wrapped gas cylinder 100 to be inspected upward, and attach the compensation block 3 to the part to be inspected;

[0074] S2. Detecting the part to be detected by the detection mechanism.

[0075] In this embodiment, before step S1, the following steps are further included:

[0076] S101, designing the compensation block 3;

[0077] S102, selecting the material of the compensation block 3;

[0078] S103, processing the compensation block 3;

[0079] S104, selecting the testing agency;

[0080] S105, arranging the fiber-wound gas cylinder tangential transillumination detection system;

[0081] After step S2, the method further comprises the following steps:

[0082] S201, image post-processing, post-processing the detection image obtained in step S2 to observe the characteristics of defect 4.

[0083] like Figure 4-Figure 13 As shown, the tangential transillumination detection method for fiber-wound gas cylinders in this embodiment specifically includes the following steps:

[0084] (1) Design compensation block 3

[0085] To design the compensation block 3 according to the size of the filament wound gas cylinder 100, it is necessary to calculate the actual outer radius r by measuring the outer circumference of the filament wound gas cylinder 100, check the designed wall thickness T of the filament wound layer 7 and the designed wall thickness t of the liner 6 through the factory data of the filament wound gas cylinder 100, and design the size of the compensation block 3 through CAD or other drawing software, such as Figure 5 As shown, the specific design steps are as follows:

[0086] ① Make a tangent straight line a along the outer circular top of the inner liner 6;

[0087] ② The straight line a and the outer surface circle of the fiber winding layer 7 have two intersection points, namely point K and point M;

[0088] ③ Take point K and point M as vertical points, and make two line segments perpendicular to the straight line a to the outside of the fiber-wound gas cylinder 100. The length of the line segment is h, which is the height of the compensation block 3;

[0089] ④ Connect the other two endpoints of the two line segments in step ③ to obtain line segment N, the length of which is b, i.e., the width of compensation block 3;

[0090] ⑤ Determine the length c of the compensation block 3 according to the size of the detector 5 or the size of the detection part.

[0091] The preliminary design of compensation block 3 is as follows Figure 6However, in actual application, the actual wall thickness of the fiber winding layer 7 and the inner liner 6 is usually greater than the designed wall thickness. According to the measured results, when designing the compensation block 3, the wall thickness of the fiber winding layer 7 is T1=T+2mm, and the wall thickness of the inner liner 6 is t1=t+1mm. In addition, in order to facilitate the processing and use of the compensation block 3, it is necessary to leave a margin surface of about 10mm on both sides of the width direction of the compensation block 3, as shown in FIG. Figure 7 For segments d and e in the figure, please note that the width of the margin surface cannot be too large, because the margin surface will increase the width of the compensation block 3, and a larger transillumination energy is required during detection.

[0092] For type IV fiber-wound gas cylinders, if the defect 4 of the plastic liner 6 needs to be detected, the compensation block 3 should be designed so that the compensation block 3 can cover the liner 6. That is, the above step ① is modified to: make a tangent straight line a1 along the inner circle top of the liner 6, such as Fig. 9 shown.

[0093] (2) Select the material of compensation block 3

[0094] The material of the compensation block 3 should be a material that is close to the density of the object being tested and easy to process. For example, the density of glass fiber (containing resin) is about 2.1g / cm 3 , detect the fiber winding layer 7 of the glass fiber wound gas cylinder, aluminum, polytetrafluoroethylene, etc. can be selected, such as carbon fiber (containing resin) The density is about 1.4g / cm 3 For testing the fiber winding layer 7 of the carbon fiber wound gas cylinder, nylon or the like can be selected. For testing the inner liner 6 of the type IV fiber wound gas cylinder, the same material as the inner liner 6 can be directly selected.

[0095] (3) Machining compensation block 3

[0096] After determining the material of the compensation block 3, a rectangular block with a size of c×b1×h is selected. After non-destructive testing is performed on the rectangular block and it is confirmed that there are no original defects that affect the detection, according to Figure 8 For mechanical processing, you can choose turning, milling or other processes that can meet the processing requirements.

[0097] (4) Select DR detection system

[0098] The DR detection system includes a DR device and a detector 5. The maximum transillumination energy of the DR device is determined by referring to the width and material of the compensation block 3. In order to ensure a higher detection sensitivity, a DR device with a smaller focal size should be selected under the premise of ensuring the transillumination energy. As a preferred embodiment, the focal size of the DR device is not greater than 1 mm, and the maximum transillumination voltage is not less than 200 kV.

[0099] It is preferred to select a detector 5 with a smaller pixel size, such as 50 μm, 100 μm, etc.

[0100] (5) Arrangement of tangential transillumination detection system for fiber-wound gas cylinders

[0101] ① Place the fiber-wound gas cylinder 100 to be tested stably on the rotatable support roller 8. If the rotatable support roller 8 cannot be provided on site, other methods can be used to place the fiber-wound gas cylinder 100 flat, but it must be ensured that the fiber-wound gas cylinder 100 can rotate within a certain range;

[0102] ② Rotate the fiber-wound gas cylinder 100, move the part to be tested to the top of the fiber-wound gas cylinder 100, and attach the compensation block 3 to the part to be tested;

[0103] ③ Place the DR device and the detector 5, adjust the height of the DR device and the detector 5, and place the X-ray window of the DR device and the center of the detector 5 at the same height as the detection part;

[0104] ④ Calculate the optimal magnification with reference to 5.4.6 of NB / T 47013.11-2023. The distance between the DR equipment and the detector 5 and the part to be detected should be arranged as far as possible with reference to the optimal magnification to obtain better image resolution;

[0105] ⑤ According to the actual situation on site, a scattered-ray shielding device may be arranged between the fiber-wound gas cylinder 100 and the detector 5 and between the fiber-wound gas cylinder 100 and the DR equipment.

[0106] (6) Transillumination detection

[0107] After the on-site arrangement is completed, the transillumination test can be carried out. The transillumination parameters are determined according to the width and material of the compensation block 3 and the actual imaging quality. The routine operations not described in this article shall be performed in accordance with NB / T 47013.11-2023.

[0108] (7) Image post-processing

[0109] In order to better observe the characteristics of defect 4, the obtained inspection image can be post-processed in the DR inspection system image processing software, such as detail enhancement technology.

[0110] (8) Special compensation block 3 design

[0111] The design of the compensation block 3 in step (1) can meet the detection requirements in most cases. However, when there is a gap 101 in the body of the fiber-wound gas cylinder 100 due to insufficient roundness, or a depression 102 appears in the detection part due to impact, the area close to the outer surface of the fiber-wound layer 7 is often difficult to observe due to the large difference in grayscale value. This is because there is a certain gap between the outer surface of the bottle body and the compensation block 3, resulting in a large difference in the transillumination thickness. Fig.10 , Fig.11Therefore, a fluid layer 9 is filled between the compensation block 3 and the fiber-wound gas cylinder 100, as shown Fig.12 As shown, the material of the fluid layer 9 should be selected to have a density close to that of the object to be detected, such as clay, water, etc. When in use, appropriate pressure should be applied to the top surface 301 of the compensation block 3 to ensure that the fluid layer 9 can fully fill the gap 101 or the recess 102.

[0112] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A fiber-wound gas cylinder tangential transillumination detection system, characterized in that: include: A detection mechanism, the detection mechanism comprising a ray source and a detector, the ray source and the detector are respectively used to be arranged on both sides of the fiber-wound gas cylinder, the ray source can emit detection rays to transilluminate the to-be-detected part of the fiber-wound gas cylinder, and the detector can receive the transilluminated detection rays to detect defects on the fiber-wound gas cylinder; A compensation block is provided with a curved surface, and the curved surface is used to fit the part to be inspected of the fiber-wound gas cylinder; wherein, in the penetration range of the detection ray, the side surfaces of the compensation block along the penetration direction of the detection ray are perpendicular to the detection ray, and the penetration thickness of the detection ray is the same.

2. The fiber-wound gas cylinder tangential transillumination detection system according to claim 1 is characterized in that: It also includes a rotating mechanism, which is used to place the fiber-wound gas cylinder and can make the fiber-wound gas cylinder rotate around its axis on the rotating mechanism; wherein the rotating mechanism includes two groups of rotatable support rollers arranged side by side, and the fiber-wound gas cylinder is placed between the two groups of support rollers.

3. The fiber-wound gas cylinder tangential transillumination detection system according to claim 1, characterized in that: A scattered-ray shielding device is also provided between the ray source and the fiber-wound gas cylinder and between the fiber-wound gas cylinder and the detector.

4. The fiber-wound gas cylinder tangential transillumination detection system according to claim 1, characterized in that: When inspecting defects of the fiber-wound layer of the fiber-wound gas cylinder, on the cross section of the compensation block, a line connecting two sides of the opening end of the compensation block is tangent to the outer circle of the inner liner of the fiber-wound gas cylinder; When inspecting defects of the inner liner of the fiber-wound gas cylinder, on the cross section of the compensation block, a line connecting two sides of the opening end of the compensation block is tangent to the inner circle of the inner liner of the fiber-wound gas cylinder.

5. The fiber-wound gas cylinder tangential transillumination detection system according to claim 4 is characterized in that: Both sides of the opening end of the compensation block are also provided with margin surfaces.

6. The fiber-wound gas cylinder tangential transillumination detection system according to claim 1, characterized in that: The compensation block is made of a material that matches the density of the inner liner or the fiber winding layer of the fiber winding gas cylinder.

7. The fiber-wound gas cylinder tangential transillumination detection system according to claim 1 is characterized in that: The invention also comprises a fluid layer, wherein the fluid layer can be filled between the compensation block and the fiber-wound gas cylinder.

8. The fiber-wound gas cylinder tangential transillumination detection system according to claim 1, characterized in that: The radiation source is a DR device, the focal diameter of the DR device is not greater than 1 mm, and the maximum transillumination voltage is not less than 200 kV; The detector is a flat panel detector, and the pixel size of the detector is 50 μm-100 μm.

9. A tangential transillumination detection method for fiber-wound gas cylinders, characterized in that: The fiber-wound gas cylinder tangential transillumination detection system according to any one of claims 1 to 8 is implemented, comprising the following steps: S1. Turn the part of the fiber-wrapped gas cylinder to be tested upward, and attach the compensation block to the part to be tested; S2. Detecting the part to be detected by the detection mechanism.

10. The tangential transillumination detection method for fiber-wound gas cylinders according to claim 9, characterized in that: Before step S1, the method further includes the following steps: S101, designing the compensation block; S102, selecting the material of the compensation block; S103, processing the compensation block; S104, selecting the testing agency; S105, arranging the fiber-wound gas cylinder tangential transillumination detection system; After step S2, the method further comprises the following steps: S201, image post-processing, post-processing the detection image obtained in step S2 to observe defect features.

Images