A kind of inner container of carbon fiber hydrogen storage cylinder and carbon fiber layer joint place nondestructive testing device

Abstract

The utility model provides a kind of inner bag and carbon fibre layer joint of carbon fibre hydrogen storage cylinder are nondestructive testing device, belong to nondestructive testing field, comprising: outer sleeve, middle hollow setting, one end is fixedly installed with stick anode, the other end is fixedly installed with the receiver matched with stick anode;Outer sleeve and the bottle mouth inner wall of hydrogen storage cylinder are connected by screw thread;The shape of receiver is hemispherical, and the ray source of stick anode is located the ball center of receiver.This scheme is by stick anode design in the ball center position of hemispherical receiver, let stick anode emit X-ray and reach the same distance after passing through defect to reach receiving, to make clear, avoid the problem that rendering is not clear due to planar receiver.

Description

Technical Field

[0001] This utility model belongs to the field of non-destructive testing technology, specifically relating to a non-destructive testing device for the joint between the inner liner and the carbon fiber layer of a carbon fiber hydrogen storage cylinder. Background Technology

[0002] Hydrogen storage cylinders with carbon fiber layers are also known as Type IV high-pressure hydrogen storage cylinders. The inner liner is wrapped with carbon fiber, but neither can be directly connected to external valves or other metal parts. Therefore, a "bottle neck connection structure" needs to be integrated at the bottle neck of the inner liner. This "bottle neck connection structure" is connected to the inner liner through a corresponding connection structure (such as a snap-fit), and then the carbon fiber is wrapped around its outside.

[0003] In the field of non-destructive testing of carbon fiber hydrogen storage cylinders, the connection between the cylinder mouth structure and the inner liner must not only withstand high pressure, but is also a key node to ensure sealing. It is a high-risk point for hydrogen leakage in hydrogen storage cylinders, so it is necessary to test it to check whether its wall thickness meets industry requirements.

[0004] Traditional non-destructive testing methods, such as ultrasonic testing and endoscopic testing, are not suitable for the complex material at the connection structure of carbon fiber hydrogen storage cylinders. Ultrasonic testing is prone to signal weakness due to severe sound wave attenuation, making it difficult to accurately identify internal defects. In addition, hidden defects in forging (such as forging shrinkage cavities) are difficult to observe directly through an endoscope. Utility Model Content

[0005] This invention proposes a non-destructive testing device for the joint between the inner liner and the carbon fiber layer of a carbon fiber hydrogen storage cylinder, which can perform non-destructive testing through other means.

[0006] To achieve the above objectives, this utility model proposes a non-destructive testing device for the joint between the inner liner and the carbon fiber layer of a carbon fiber hydrogen storage cylinder, comprising: The outer tube is hollow in the middle, with a rod anode fixedly installed at one end and a receiver that matches the rod anode fixedly installed at the other end; the outer tube is connected to the inner wall of the hydrogen storage cylinder by threads. The receiver is hemispherical in shape, with the radiation source of the rod anode located at the center of the receiver.

[0007] In this scheme, the X-ray source of the rod anode is positioned at the center of the hemispherical receiver. This has the advantage that, since the distance from the center to any point on the sphere is equal, the attenuation of the X-rays during propagation is consistent, avoiding the "clear center, blurred edges" problem caused by planar receivers where "edge rays travel longer and attenuate more severely." Specifically, for the annular inspection area of ​​the hydrogen storage cylinder—the seam between the cylinder neck and the inner liner—uniform X-ray reception ensures consistent image grayscale and detail resolution at different locations along the seam, facilitating accurate identification of defects such as uneven wall thickness and micro-cracks by inspectors, and reducing misjudgments caused by imaging differences. The "seam between the inner liner and the carbon fiber layer" of the carbon fiber hydrogen storage cylinder is an annular structure surrounding the cylinder neck, and the arc-shaped inner wall of the hemispherical receiver naturally forms a "360° surround receiving range." If X-rays encounter a planar receiver during inspection, specular reflection can easily occur, generating stray signals that interfere with the normal imaging signal, resulting in "artifacts" (such as light spots and streaks) in the image, affecting defect judgment. When rays irradiate the curved inner wall, the reflection direction is dispersed and it is not easy for them to interfere with the ray source or other receiving areas in the opposite direction, which greatly reduces the impact of stray light on imaging.

[0008] Furthermore, an inner sleeve is inserted through the outer sleeve. The inner sleeve is hollow in the middle, and one end of the inner sleeve extends from one end of the outer sleeve. The rod anode is installed at the end of the inner sleeve that extends out of the outer sleeve. The inner sleeve is movably locked onto the outer sleeve. A slide rail is provided on the inner wall of the outer sleeve, and a slider is fixedly connected to the outer wall of the inner sleeve. Through the cooperation of the slider and the slide rail, the inner sleeve can only move along the axis of the outer sleeve. A motor is installed in the outer sleeve to move the inner sleeve and the rod anode as a whole. A threaded rod is installed on the shaft of the motor, and the threaded rod is threaded into the inner sleeve. Two buttons for forward and reverse rotation of the motor are provided on the outside of the outer sleeve. The receiver has various diameter specifications. When the rod anode moves, different specifications of receivers are used for rod anodes at different positions to ensure that the radiation source of the rod anode is at the center of the receiver.

[0009] Carbon fiber hydrogen storage cylinders are not a single specification. The "joint position of the cylinder mouth connection structure and the inner liner" will vary depending on parameters such as cylinder volume, inner liner length, and cylinder mouth depth. If the rod anode is fixed, it can only detect the joint position of a specific specification of cylinder and cannot be adapted to other sizes of cylinders. However, by designing the rod anode to be movable, the X-ray source (rod anode target surface) can be "precisely aligned" according to the joint position of different cylinders.

[0010] Furthermore, a horizontal tube is inserted through the outer tube, with its axis parallel to that of the outer tube. The horizontal tube can rotate relative to the outer tube around its own axis. One end of the horizontal tube extends out of the outer tube near the rod anode, and the horizontal tube is fixedly connected to the rod anode. Taking a point on the horizontal tube as A, a point on the rod anode as B, and a point at the corner where the horizontal tube and the rod anode connect as O, then ∠AOB is 170°-180°. The other end of the horizontal tube is fixedly connected to a first gear, and the outer tube is provided with a drive structure that meshes with the first gear. The operator uses the drive structure to rotate the horizontal tube and the rod anode as a whole.

[0011] The "inner liner and carbon fiber layer joint" of the carbon fiber hydrogen storage cylinder is a ring structure surrounding the cylinder mouth. Defects (such as cracks, shrinkage cavities, and uneven wall thickness) may be distributed in different circumferential positions such as the "inner side, outer side, and inclined surface" of the ring. If the rod anode X-ray source is always located at the center of the receiver sphere, the X-ray will irradiate at a fixed angle "perpendicular to the annular plane of the joint" (similar to "direct frontal radiation"), which can only clearly image the "front area" of the joint, while forming a blind spot for detecting defects on the annular side and inclined transition area. By designing a rotating structure, the incident angle of the rod anode can be diversified, enabling imaging from more angles and avoiding the omission of blind spots.

[0012] Furthermore, a stop block is fixedly connected to the outer tube. The stop block cannot be inserted into the mouth of the hydrogen storage cylinder. When the stop block contacts the edge of the mouth of the hydrogen storage cylinder, the position of the outer tube reaches the set position.

[0013] When the operator screws the outer tube into the gas cylinder opening through the thread, the stop block will contact the edge (outside) of the opening, forming a "hard block" to prevent the outer tube from continuing to screw into the gas cylinder. At this time, the position of the outer tube is exactly the preset "detection reference position", which can ensure that the X-ray source of the rod anode is accurately aligned with the joint (without the operator repeatedly adjusting or measuring the depth).

[0014] By employing the above technical methods, the beneficial effects that this solution can achieve are: 1. This solution designs a hemispherical receiver so that the X-rays emitted from the rod anode X-ray source travel the same distance to the receiver after passing through the bottle mouth connection structure. Uniform X-ray reception ensures consistent imaging grayscale and detail resolution at different locations of the joint, making it easier for inspectors to accurately identify defects such as uneven wall thickness and micro-cracks, and reducing misjudgments caused by imaging differences.

[0015] 2. The seam between the connecting structure and the inner liner is a ring-shaped three-dimensional structure around the bottle mouth. The arc-shaped inner wall of the receiver can naturally form a 360° circumferential receiving range. It can capture rays from all positions on the circumference of the seam without adjusting the angle, thus avoiding the cumbersome operation of traditional planar receivers that require multiple rotations to cover the ring area.

[0016] 3. This solution targets the annular three-dimensional structure at the connection between the bottle neck and the inner liner. It employs the collaboration of a rod anode and a hemispherical receiver to achieve "full-area, high-precision, and interference-free" non-destructive testing at the joint of the connection structure, providing a reliable guarantee for the high-pressure sealing safety of the connection structure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of Example 1; Figure 2 This is a schematic diagram of the overall structure of Example 2; Figure 3 This is a schematic diagram of the overall structure of Example 3.

[0018] 1. Hydrogen storage cylinder; 2. Outer sleeve; 3. Rod anode; 4. Receiver; 5. Stop block; 6. Stop block; 7. Nut; 8. Inner sleeve; 9. Slider; 10. Motor; 11. Button; 12. Horizontal tube; 13. First gear; 14. Long rod; 15. Second gear; 16. Handwheel. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] Example 1: As Figure 1 As shown, a non-destructive testing device for the joint between the inner liner and the carbon fiber layer of a carbon fiber hydrogen storage cylinder includes: The outer tube 2 is hollow inside, with a rod anode 3 fixedly installed at one end and a receiver 4, which is matched with the rod anode 3, fixedly installed at the other end. The receiver 4 is used to receive the X-rays emitted by the rod anode and passing through the bottle opening connection structure, and can convert the X-rays into observable and analyzable images or data. The wires of the rod anode 3 extend from the end of the hollow outer tube 2 (see...). Figure 1 And it is connected to an external power source.

[0021] The diameter of the outer sleeve 2 is smaller than the inner diameter of the hydrogen storage cylinder 1. The outer surface of the outer sleeve 2 has external threads, allowing it to connect with the internal threads on the inner wall of the hydrogen storage cylinder 1. A stop block 5 is fixedly connected to the circumferential wall of the outer sleeve 2, preventing it from being inserted into the hydrogen storage cylinder. During the screwing process, when the stop block 5 contacts the end face of the hydrogen storage cylinder 1, the outer sleeve 2 reaches its designated position. Due to the restriction of the stop block 5, the outer sleeve 2 cannot continue to screw into the hydrogen storage cylinder 1. Because the diameter of the rod anode 3 is much smaller than the inner diameter of the hydrogen storage cylinder 1, the rod anode 3 can extend from the cylinder opening into the inner cavity of the hydrogen storage cylinder 1.

[0022] The receiver 4 is hemispherical in shape. Assuming the end target surface (ray source) of the rod anode 3 is a point mass, this point mass is located exactly at the center of the receiver 4. A threaded hole is provided in the middle of the receiver 4. The receiver 4 is installed on the outer sleeve 2 using threads, a nut 7, and a locking washer. The receiver 4 is screwed into the outer sleeve via threads. A stop 6 is integrally provided on the peripheral wall of the outer sleeve 2. When the receiver 4 is screwed onto the outer sleeve, the stop 6 restricts the position of the receiver 4 and prevents the receiver from moving further towards the rod anode 3. The aforementioned nut 7 and stop 6 are located on both sides of the receiver 4, clamping the receiver 4 from both sides.

[0023] The key design features of the hemispherical receiver 4 are: by positioning the rod anode target surface (particle) precisely at the center of the sphere, X-rays emitted from the target surface and passing through the connection between the bottle mouth and the inner liner can reach the inner wall of the receiver along similar paths, reducing the attenuation differences of rays at different angles and improving the uniformity and clarity of the image; its arc-shaped structure can naturally cover a larger receiving range, capturing rays passing through different areas of the bottle mouth seam without additional angle adjustments, adapting to the ring detection requirements at the seam; compared to a planar receiver, the hemispherical design can also reduce the reflection interference of rays on the receiving surface, reduce the impact of stray light on the image or data, and further ensure the accuracy of the detection signal.

[0024] The rod anode's target surface X-rays can be focused on a specific area—the seam between the inner liner and the carbon fiber layer—reducing ineffective X-ray radiation to other non-detected parts of the gas cylinder. This ensures detection accuracy at the seam while lowering the overall radiation dose. Furthermore, the rod anode can be integrated with a hollow outer tube, and the design of the wires passing through the rod avoids cable interference with the detection path, making the overall structure of the device more compact. This facilitates precise positioning inside the gas cylinder and improves the stability of the detection operation.

[0025] Example 2: As Figure 2As shown, a non-destructive testing device for the joint between the inner liner and the carbon fiber layer of a carbon fiber hydrogen storage cylinder differs from Embodiment 1 in that, in this embodiment, the rod anode 3 can move relative to the outer sleeve 2 along the axial direction of the outer sleeve 2, and it has receivers 4 with various radii to adapt to testing scenarios where the rod anode is located in different positions. Specifically, it includes the following structure: The outer sleeve 2 is hollow, and an inner sleeve 8 is inserted through the outer sleeve 2. The axes of the two are parallel, and one end of the inner sleeve 8 extends from one end of the outer sleeve 2. The rod anode 3 is installed at the end of the inner sleeve 8 that extends out of the outer sleeve 2. The inner sleeve 8 is hollow and is movably locked onto the outer sleeve 2. A slide rail is provided on the inner wall of the outer sleeve 2, and a slider 9 is fixedly connected to the outer wall of the inner sleeve 8. Through the cooperation of the slider 9 and the slide rail, the inner sleeve 8 can only move along the axis of the outer sleeve 2. The outer sleeve 2 houses a motor 10 (with a built-in control program and a set maximum number of rotations). The motor 10's battery is fixedly mounted on the outside of the outer sleeve 2 using a sealed structure, providing impact resistance and oil resistance. The inner sleeve 8 has internal threads, and a threaded rod is mounted on the motor 10's shaft, threaded with the inner sleeve 8. The outer sleeve 2 has two buttons 11 on its exterior that reverse the motor 10. When the user presses the corresponding button 11, the motor 10 is powered on and drives the inner sleeve 8 to move along the axis of the outer sleeve 2. The adjustment range of the rod anode 3 radiation source is as follows: when the rod anode 3 is not moving, the distance between the end target surface of the rod anode 3 and end A of the outer sleeve 2 is set to 0 cm; when the rod anode 3 moves away from the receiver 4 to its end (… Figure 2 (State), the distance between the end target surface of the rod anode 3 and end A of the outer sleeve 2 is 10cm. The receiver 4 has various radius specifications, including 40cm, 48cm, and 50cm.

[0026] The adjustment range of the rod anode 3 radiation source: When the rod anode 3 is not moved, the distance between its end target surface and end A of the outer sleeve 2 is 0 cm; when the rod anode 3 moves away from the receiver 4 to its end ( Figure 2 (Status), the distance between the end target surface and end A of the outer sleeve 2 is 10cm. Receiver 4 has radius specifications including 40cm, 48cm, and 50cm, etc. The outer sleeve 2 has scale markings and positioning pins corresponding to the receiver installation position to ensure that the center of the sphere is coaxial with the X-ray source after installation for different receiver sizes. During installation, precise positioning is achieved using the positioning pins, followed by double-nut locking with anti-loosening adhesive to prevent the receiver from loosening during testing.

[0027] Adaptation rules: When the distance between the target surface at the end of the rod anode 3 and end A of the outer sleeve 2 is 0cm, a receiver 4 with a radius of 40cm is used; when the distance is 10cm, a receiver 4 with a radius of 50cm is used (i.e., ...). Figure 2(The receiver in the middle); when the distance is between 0-10cm, use a receiver 4 with a radius of 48cm or other receivers with a suitable radius to ensure that the radiation source of the rod anode is basically located at the center of the receiver sphere.

[0028] Example 3: A non-destructive testing device for the joint between the inner liner and the carbon fiber layer of a carbon fiber hydrogen storage cylinder. In Example 1, although the rod anode emits X-rays outward, the rod anode itself is always located on the axis of the hydrogen storage cylinder. This results in the rod anode being unable to emit X-rays from different angles, and the constructed image will also have a single imaging angle.

[0029] In this embodiment, the angle of the rod anode is adjustable, specifically including: The horizontal tube is rotatably connected to the outer tube 2 via a bearing, with its axis parallel to the axis of the outer tube 2. One end of the horizontal tube, near end A of the outer tube, extends out of the outer tube 2. The rod anode is fixedly installed on the end of the horizontal tube extending out of the outer tube 2. The axis of the rod anode is not parallel to the axis of the horizontal tube. Taking a point on the horizontal tube as A, a point on the rod anode as B, and the corner where the horizontal tube and rod anode connect as O, then ∠AOB is 170°-180°. Verification has shown that this angle range ensures that when the rod anode angle is adjusted, the X-ray can completely cover the annular joint area, with no blind spots.

[0030] The wire of the rod anode passes through the hollow horizontal tube and extends into the cavity of the outer tube 2, finally exiting from the end of the outer tube 2 to connect to an external power source. A first gear is fixedly installed at one end of the horizontal tube located in the outer tube 2, and a drive structure is provided in the outer tube 2 for meshing and transmitting power with the first gear.

[0031] The drive structure includes a long rod, rotatably connected to the outer tube 2 via a base, with the axis of the long rod parallel to the axis of the outer tube 2. A second gear is fixedly mounted on one end of the long rod near the linkage gear, meshing with the first gear. The other end of the long rod extends to the outside of the outer tube 2, where a handwheel and a locking nut (assisted by a ratchet mechanism) are installed. The operator manually rotates the rod anode using the drive structure, and the angle is fixed by the locking nut after rotation to prevent displacement due to vibration and ensure the repeatability of the detection images. When the rod anode rotates around the axis of the transverse tube, the position of the X-ray source changes due to the 170°-180° angle between ∠AOB and the X-ray image after passing through the defect changes synchronously, allowing for the acquisition of more diverse defect images.

[0032] The structural parts not mentioned in this embodiment are the same as those in Embodiment 1.

[0033] Example 4: A non-destructive testing method for the joint between the inner liner and the carbon fiber layer of a carbon fiber hydrogen storage cylinder, comprising the following steps: S1: Assemble a non-destructive testing device for the joint between the inner liner and the carbon fiber layer of a carbon fiber hydrogen storage cylinder. Insert the rod anode into the internal cavity of the hydrogen storage cylinder and screw the outer sleeve onto the internal thread of the cylinder opening until the stop block contacts the outside of the cylinder opening. At this point, the connection between the outer sleeve and the hydrogen storage cylinder is complete.

[0034] S2: Power is applied to start the anode of the rod. X-rays are generated at the target surface of the anode and pass through the connection between the bottle mouth and the inner liner (hereinafter referred to as the connection seam). The image is then imaged on the receiver to complete one inspection. Image analysis methods are used to analyze the defects in the detected image. S3: Replace with a receiver of another size, and move the rod anode by pressing the button. Perform multiple imaging operations through the receiver to complete multiple inspections. Use image analysis methods to analyze the defects in the detected images.

[0035] S4: Compare the results of multiple tests and select the clearest image using a computer.

[0036] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A non-destructive testing device for the joint between the inner liner and the carbon fiber layer of a carbon fiber hydrogen storage cylinder, characterized in that, include: The outer tube is hollow in the middle, with a rod anode fixedly installed at one end and a receiver that matches the rod anode fixedly installed at the other end; the outer tube is connected to the inner wall of the hydrogen storage cylinder by threads. The receiver is hemispherical in shape, with the radiation source of the rod anode located at the center of the receiver.

2. The non-destructive testing device for the joint between the inner liner and the carbon fiber layer of a carbon fiber hydrogen storage cylinder according to claim 1, characterized in that, An inner sleeve is inserted through the outer sleeve. The inner sleeve is hollow in the middle, and one end of the inner sleeve extends from one end of the outer sleeve. The rod anode is installed at the end of the inner sleeve that extends out of the outer sleeve. The inner sleeve is movably locked onto the outer sleeve. A slide rail is provided on the inner wall of the outer sleeve, and a slider is fixedly connected to the outer wall of the inner sleeve. Through the cooperation of the slider and the slide rail, the inner sleeve can only move along the axis of the outer sleeve. A motor is installed in the outer sleeve to move the inner sleeve and the rod anode as a whole. A threaded rod is installed on the shaft of the motor, and the threaded rod is threaded into the inner sleeve. Two buttons are provided on the outside of the outer sleeve to make the motor move forward and reverse. The receiver has a variety of different diameters. When the rod anode moves, different diameter receivers are used for rod anodes at different positions to ensure that the radiation source of the rod anode is at the center of the receiver.

3. The non-destructive testing device for the joint between the inner liner and the carbon fiber layer of a carbon fiber hydrogen storage cylinder according to claim 1, characterized in that, A horizontal tube is inserted through the outer tube, with its axis parallel to that of the outer tube. The horizontal tube can rotate relative to the outer tube around its own axis. One end of the horizontal tube extends out of the outer tube near the rod anode, and the horizontal tube is fixedly connected to the rod anode. Taking a point on the horizontal tube as A, a point on the rod anode as B, and a point at the corner where the horizontal tube and the rod anode connect as O, then ∠AOB is 170°-180°. The other end of the horizontal tube is fixedly connected to a first gear, and the outer tube is equipped with a drive structure that meshes with the first gear. The operator uses the drive structure to rotate the horizontal tube and the rod anode as a whole.

4. The non-destructive testing device for the joint between the inner liner and the carbon fiber layer of a carbon fiber hydrogen storage cylinder according to claim 2, characterized in that, A stop block is fixedly connected to the outer tube. The stop block cannot be inserted into the opening of the hydrogen storage cylinder. When the stop block contacts the edge of the opening of the hydrogen storage cylinder, the position of the outer tube reaches the set position.

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