Method for obtaining X-ray film for submarine cable joint performance testing

Abstract

The present invention relates to a method for obtaining X-ray films for submarine cable joint performance testing, which includes the following steps: 1) first suspending the submarine cable joint from the joint parts at both ends on opposite sides of the positioning seat, and closing the detection space, at this time, the X-ray detection area covers the joint part to be tested; 2) the driving roller rolls relative to the circular arc guide rail, and the truss flips relatively. After each flip of N°, the driving roller and the movable guide wheel position the truss and the circular arc guide rail relative to each other at the corresponding flip position, and simultaneously obtain the X-ray film at the corresponding position; 3) after maintaining the same direction of flipping and the sum of the flip angles being equal to 180°, the acquisition of the X-ray film of the position corresponding to the circumferential angle of the corresponding joint part is completed. On the one hand, the present invention obtains X-ray films of each circumferential angle of the part to be tested successively and without the risk of detection omissions or overlapping detection angles; on the other hand, the X-ray film is automatically obtained in a closed space to avoid the influence of external factors.

Description

[0001] This application is a divisional application with the application date of July 9, 2021, application number 202110779631.8, and name as X-ray machine and detection method suitable for submarine cable joint performance testing. Technical Field

[0002] The present invention belongs to the field of X-ray machines, and in particular relates to a method for obtaining X-ray films for submarine cable joint performance testing. Background Art

[0003] The X-ray machine is mainly composed of an X-ray tube and an X-ray power supply. The X-ray tube is composed of a cathode filament, an anode target and a vacuum glass tube. The X-ray power supply can be divided into two parts: a high-voltage power supply and a filament power supply. The filament power supply is used to heat the filament. The high-voltage output ends of the high-voltage power supply are respectively located at the cathode filament and the anode target, providing a high-voltage electric field to accelerate the active electrons on the filament to flow toward the anode target, forming a high-speed electron flow.

[0004] At the same time, submarine cables are laid between offshore substations and land, and between wind turbines and offshore substations. Submarine cables are primarily used to transmit high-power electricity underwater, serving the same purpose as underground power cables. Their application environments are more harsh, and their transportation and installation are far more difficult than other cable products. Therefore, submarine cables must be manufactured in long, continuous lengths. During the cable manufacturing process, to create a continuous line, each cable segment must be connected as a whole. Therefore, the connection point between each cable segment is called a submarine cable joint. The structural dimensions of a submarine cable joint are similar to those of the submarine cable itself, and they share the same electrical, mechanical, bending, and service life as the cable itself.

[0005] However, once bubbles or impurities appear inside the submarine cable joint, it is easy to be damaged and has a short service life. In addition, it is very inconvenient to replace the submarine cable joint, and the cost of replacement is very high. Therefore, before use, the internal structure of the submarine cable joint must be inspected to reduce the probability of damage after use.

[0006] Currently, there are ultrasonic testing and X-ray testing on the market. For X-ray testing, it mainly uses an X-ray machine to illuminate the joint area and observe the X-ray film of the joint area to check whether there are impurities, micropores and whether the eccentricity meets the requirements. However, if only one viewing angle is tested, the internal structure of the submarine cable joint cannot be fully reflected. If the viewing angle is rotated (180° rotation is required to achieve a full circle of the submarine cable joint detection, which is mainly determined by the characteristics of the X-ray machine), the benchmark is difficult to determine, and if it is manually operated, it is also difficult to ensure that the rotation angle is uniform. Therefore, there is a high probability of detection error. Summary of the Invention

[0007] In order to overcome the defects of the prior art, the object of the present invention is to provide an improved X-ray film acquisition method for submarine cable joint performance detection.

[0008] The technical solution of the present invention is: a method for obtaining X-ray films for detecting the performance of submarine cable joints, the X-ray machine used in the method includes a frame, a positioning frame, and an X-ray film acquisition unit, wherein the X-ray film acquisition unit includes an irradiation end, a collection end and a connection part, the frame includes a frame frame and a truss, a cover that can be opened or closed is formed on the frame frame, the joint parts at both ends of the submarine cable joint are suspended and arranged on opposite sides of the positioning frame, and an X-ray detection area that can cover the detected joint parts is formed between the irradiation end and the collection end, the X-ray machine also includes a first drive unit, the first drive unit includes an arc segment guide rail with the center of the submarine cable joint positioned on the positioning seat as the center of the circle, a movable guide wheel arranged on the truss and capable of matching the arc segment guide rail, a drive motor arranged on the truss, and a drive roller arranged at the output end of the drive motor and matching the arc segment guide rail, wherein there are multiple movable guide wheels and they are correspondingly distributed on the inner and outer sides of the arc segment guide rail. The X-ray film acquisition method includes the following steps:

[0009] 1) First, suspend the joints at both ends of the submarine cable joint on opposite sides of the positioning seat and close the detection space. At this time, the X-ray detection area covers the joint part to be inspected;

[0010] 2) The driving roller rolls relative to the circular arc guide rail, and the truss flips relative to each other. After each flip of N°, the driving roller and the movable guide wheel position the truss and the circular arc guide rail relative to each other at the corresponding flip position, and at the same time obtain an X-ray film at the corresponding position;

[0011] 3) After the flipping is kept in the same direction and the sum of the flipping angles is equal to 180°, the X-ray films corresponding to the positions of the corresponding joint parts with successively changing circumferential angles are obtained.

[0012] Preferably, in step 2), 10≤N≤20, and the truss is flipped at the same angle each time. This ensures that multiple X-rays of the joint are obtained step by step under the premise of relative uniformity. Specifically, N=15, so that 13 X-rays can be obtained.

[0013] According to a specific embodiment and preferred aspect of the present invention, the truss includes a main plate extending along the length of the positioned submarine cable connector, end plates disposed at both ends of the main plate, two circular arc guide rails correspondingly disposed on the inner walls of the frame frame on either side of the positioning seat, and a plurality of movable guide wheels divided into two groups, each group of movable guide wheels correspondingly disposed on an end plate. By utilizing the principle of two points defining a straight line, the X-ray acquisition unit can be flipped more smoothly, and the flip angle can be easily controlled.

[0014] Preferably, each arc-segment guide rail comprises an arc track frame and an arc track. The arc track frame is fixed to the inner wall of the frame frame, and the movable guide wheel is formed with a wheel groove that matches the arc track, and the drive roller rolls on the inner wall of the arc track frame. The wheel groove cooperates with the increase in contact area, which is more conducive to the relative positioning of the truss and the arc-segment guide rail in the static state, ensuring that the corresponding X-ray film is obtained at a stable flip angle position.

[0015] In this example, the cross section of the wheel groove is V-shaped. This reduces the probability of derailment.

[0016] According to another specific embodiment and preferred aspect of the present invention, each set of movable guide wheels comprises three, arranged in a triangular pattern, with the center of the drive roller located within the area defined by the three movable guide wheels. This arrangement of the three movable guide wheels and the drive roller allows the drive roller to be positioned on the arc-shaped guide rail without rotating, thereby enabling X-ray film acquisition at various angles.

[0017] Specifically, two of the three movable guide wheels are located on the inner side of the circular arc track, and one is located on the outer side of the circular arc track.

[0018] The X-ray machine also includes a second driving unit that drives the movement of the X-ray film acquisition unit relative to the truss to realize the shift of the X-ray detection area between the two joint parts. The X-ray film acquisition method also includes step 4), which completes the circumferential X-ray acquisition of one joint part, and the second driving unit drives the X-ray film acquisition unit to move to another joint part, and repeats the above steps 2) and 3) to complete the X-ray film acquisition of another joint part.

[0019] Preferably, the second driving unit comprises a linear track located on the truss and extending along the length direction of the truss, and a linear driving member, wherein the connecting portion is slidably arranged on the linear track.

[0020] Specifically, in this example, the linear drive element is a transmission screw. The transmission motor for the transmission screw is located on the back of the mainboard, while the drive motor is located on the front of the mainboard and fixed to the end plate. The transmission motor and the drive motor are positioned relatively balanced at opposite ends of the mainboard. This ensures a relatively centered center of gravity, facilitating the deflection of the X-ray acquisition unit or the switching of detection locations.

[0021] The locating base includes a first locating portion fixed within the base and positioned in the middle of the cable connector, and second locating portions located on opposite sides of the first locating portion for the ends of the cable connector to pass through and position. The locating base provides three-point positioning of the cable connector at both ends and the middle, preventing omissions or duplications in X-rays due to rotation or displacement of the cable connector during testing, which could affect the accuracy of test results.

[0022] The X-ray machine also includes a first sensor that monitors the closure of the cover and a second sensor that monitors the position and displacement of the submarine cable connector. The first sensor ensures that X-rays are captured within the closed area, preventing external factors from influencing the accuracy of the test results. The second sensor ensures the accurate positioning of the submarine cable connector and prevents it from shifting. This prevents omissions or duplications in multiple X-rays, thereby ensuring the accuracy of the test results.

[0023] Compared with the prior art, the present invention has the following advantages:

[0024] On the one hand, the present invention realizes truss flipping and positioning by cooperating with the driving roller and the movable guide wheel and the circular arc guide rail, thereby obtaining X-ray films of various circumferential angles of the part to be inspected successively and without easily missing detection or overlapping detection angles; on the other hand, in a closed space, X-ray films of the part to be inspected can be automatically obtained, avoiding external factors affecting the accurate acquisition of X-ray films, improving the accuracy of the detection results, and ensuring that qualified products are used in submarine cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the X-ray machine of the present invention;

[0026] Figure 2 for Figure 1 Schematic diagram of the structure of the X-ray machine with the middle cover opened;

[0027] Figure 3 for Figure 2 A magnified schematic diagram of the local structure;

[0028] Figure 4 for Figure 3 Schematic diagram of the right side;

[0029] Wherein: 1, frame; 10, frame base; 10a, frame frame; 10b, truss; b1, main board; b2, end plate; 11, positioning seat; 11a, first positioning portion; 11b, second positioning portion; 12, cover; 13, handle; 14, base; 15, travel roller;

[0030] 2. X-ray film acquisition unit; 20. Irradiation end; 21. Collection end; 22. Connection part;

[0031] 3. First drive unit; 30. Arc guide rail; 300. Arc track frame; 301. Arc track; 31. Moving guide wheel; 31a. Wheel groove; 32. Drive motor; 33. Drive roller;

[0032] 4. Second drive unit; 40. Linear track; 41. Linear drive member; 410. Transmission motor;

[0033] 5. First sensor;

[0034] 6. Second sensor.

[0035] J, submarine cable joint; j, joint part. DETAILED DESCRIPTION

[0036] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0037] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0039] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0040] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher horizontal height than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower horizontal height than the second feature. It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or there can be an intermediate element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there can be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0041] like Figure 1 and Figure 2 As shown, the X-ray machine of this embodiment is suitable for testing the performance of submarine cable joints, which includes a frame 1; an irradiation end 20, a collection end 21 and a connection part 22 constituting an X-ray film acquisition unit 2; a first driving unit 3 for driving the X-ray film acquisition unit 2 to flip and position it at a flip angle; and a second driving unit 4 for driving the X-ray film acquisition unit 2 to move laterally.

[0042] Specifically, the rack 1 includes a rack base 10 and a positioning base 11 , wherein the submarine cable connector J is positioned on the positioning base 11 .

[0043] In this example, the frame 10 includes a frame frame 10a and a truss 10b, wherein the frame frame 10a is formed with an opening, and the frame 1 further includes a cover 12 (rotatably disposed on the frame frame 10a and capable of opening or closing the opening) Figure 1 The middle is closed state, Figure 2 (open in the middle).

[0044] Specifically, the cover shell 12 and the frame frame 10 a form a closed space, and the positioning seat 11 is located in the closed space.

[0045] In this example, gas springs or telescopic rods are provided on both sides of the frame edge 10 a , wherein the cover 12 is opened or closed by the telescopic movement of the gas springs or telescopic rods.

[0046] For easy operation, a handle 13 may be formed on the cover 12 .

[0047] In this example, the cover 12 is rotatably connected to the top edge of the opening of the frame frame 10a by a hinge at its top edge.

[0048] The truss 10 b extends in the left-right direction and is located behind the positioning seat 11 .

[0049] The locating base 11 includes a first locating portion 11a fixed within the mounting base 10 and positioned in the middle of the cable connector J. Second locating portions 11b, located to the left and right of the first locating portion 11a, allow the ends of the cable connector J to pass through and position themselves. This allows for three-point positioning of the cable connector at both ends and the middle, preventing omissions or duplications in X-rays due to rotation or displacement of the cable connector during testing, which could affect the accuracy of the test results.

[0050] Specifically, the second positioning portion 11b is correspondingly arranged on the left and right sides of the opening of the frame frame 10a, and is located at the intersection of the edges of the opening. At the same time, a bayonet is formed on the cover shell 12. When the cover shell 12 is closed, the bayonet is engaged with the second positioning portion 11b, so that the stability and sealing of the cover shell 12 are higher after closing, thereby avoiding the misjudgment of the detection results caused by the external environment.

[0051] At the same time, after the submarine cable joint J is positioned, the two joint parts j are suspended between the first positioning portion 11 a and the second positioning portion 11 b at the corresponding end, so that the rotation or lateral movement of the X-ray film acquisition unit 2 can avoid the positioning seat 11.

[0052] Combine Figure 3 As shown, the irradiation end 20 includes an X-ray tube; the collection end 21 is used to receive the X-rays emitted by the irradiation end 20; the connecting portion 22 connects the irradiation end 20 and the collection end 21, and an X-ray detection area is formed between the irradiation end 20 and the collection end 21. These are conventional settings and will not be elaborated on in detail here. They are also clear and feasible. At the same time, it should be noted that the X-ray film acquisition unit 2 is slidably set on the truss 10b by the connecting portion 22.

[0053] Specifically, the X-ray detection area can cover any joint part j, and the X-ray machine is used to obtain X-ray films showing the internal structure of the joint part j from multiple angles.

[0054] In this example, first drive unit 3 is used to drive the synchronous flipping of truss 10b and X-ray film acquisition unit 2. With each rotation angle, the X-ray detection area deflects and acquires an X-ray film of the corresponding joint j. Second drive unit 4 drives the movement of X-ray film acquisition unit 2 relative to truss 10b to shift the X-ray detection area between the two joints j. This allows X-ray films to be acquired at corresponding angles after rotational adjustment, ensuring the accuracy of the test results by evaluating multiple X-rays. Furthermore, by shifting X-ray film acquisition unit 2, two joints j can be inspected simultaneously or sequentially.

[0055] Specifically, each time the first drive unit 3 drives the truss 10b to flip N times, it obtains an X-ray of the joint j at the deflected position. Once the total flip angle reaches 180°, the X-ray acquisition unit completes the acquisition of multiple X-rays around the joint. In this way, after the flip angle reaches 180°, a comprehensive inspection of the joint can be achieved.

[0056] In this example, N = 15, where each flip angle of truss 10b is equal and in the same flip direction. This ensures that 13 X-rays are obtained for a comprehensive inspection of the joint while maintaining relative uniformity. Furthermore, at this flip angle, all 13 X-rays can be obtained quickly and accurately, resulting in highly accurate inspection results.

[0057] The first drive unit 3 includes an arc-shaped guide rail 30 centered about the center of the submarine cable joint J positioned on the positioning seat 11, a movable guide wheel 31 disposed on the truss 10b and compatible with the arc-shaped guide rail 30, a drive motor 32 disposed on the truss 10b, and a drive roller 33 disposed at the output end of the drive motor 32 and compatible with the arc-shaped guide rail 30. There are multiple movable guide wheels 31, which are correspondingly distributed on the inner and outer sides of the arc-shaped guide rail 30. When the drive roller 33 rolls relative to the arc-shaped guide rail 30, the truss 10b flips relative to it. When the drive roller 33 is stationary relative to the arc-shaped guide rail 30, the drive roller 33 and the movable guide wheel 31 fix the truss 10b relative to the arc-shaped guide rail 30, and the X-ray film acquisition unit obtains an X-ray film of the corresponding joint location. Here, with the cooperation of the arc-shaped guide rail and the movable guide wheel, the relative rotation of the drive roller achieves the acquisition of 13 X-ray films.

[0058] In this example, there are two arc-segment guide rails 30 , which are correspondingly arranged on the inner walls of the frame frame 10 a on the left and right sides of the positioning seat 11 .

[0059] Specifically, the arc-segment guide rail 30 comprises an arc track frame 300 and an arc track 301. The arc track frame 300 is fixed to the inner wall of the frame frame 10a. A wheel groove 31a is formed on the movable guide wheel 31 to match the arc track 301. The driving roller 33 rolls on the inner wall of the arc track frame 300. The wheel groove 31a increases the contact area, facilitating relative positioning of the truss and the arc-segment guide rail when stationary, ensuring a stable flip angle for obtaining the appropriate X-ray film.

[0060] In this example, the cross section of the wheel groove 31a is V-shaped, which reduces the probability of derailment.

[0061] Truss 10b comprises a main plate b1 extending along the length of the positioned submarine cable joint J, and end plates b2 located at either end of main plate b1. The movable guide wheels 31 are divided into two groups, each corresponding to an end plate b2. By employing the principle of two points defining a straight line, the X-ray acquisition unit can be rotated more smoothly, and the angle of rotation can be easily controlled.

[0062] Combine Figure 4 As shown, each set of movable guide wheels 31 includes three, two of which are located on the inner side of the circular track 301 and one on the outer side. The three movable guide wheels 31 are arranged in a triangular pattern, and the center of the driving roller 33 is located within the area formed by the three movable guide wheels 31. The distribution of the three movable guide wheels and the driving roller allows the driving roller to be positioned on the circular track without rotating, thereby satisfying the requirements for acquiring X-rays at different angles.

[0063] The second drive unit 4 comprises a linear track 40, located on the main board b1 and extending along its length, and a linear drive member 41. The connecting portion 22 is slidably mounted on the linear track 40. The linear drive member 41 is a telescopic rod or a drive screw that matches the connecting portion. Driven by the linear drive member, the X-ray acquisition unit moves from one joint to the other, bypassing the positioning base, thereby completing X-ray inspection of both joints.

[0064] Specifically, the linear drive element 41 is a transmission screw. Its transmission motor 410 is located on the back of the main board b1. The drive motor 32 is located on the front of the main board b1 and fixed to the end board b2. The transmission motor 410 and the drive motor 32 are positioned relatively evenly at opposite ends of the main board b1. This ensures a relatively centered center of gravity, facilitating the deflection of the X-ray acquisition unit or the switching of detection locations.

[0065] In addition, the X-ray machine further comprises a first sensor 5 for monitoring the closing state of the cover 12 and a second sensor 6 for monitoring the positioning and displacement state of the submarine cable joint J.

[0066] Specifically, the first sensor 5 and the second sensor 6 are uniform contact sensors. As long as the cover 12 closes the opening of the first sensor 5, it can contact the first sensor 5. Therefore, under the setting of the first sensor 5, it is ensured that the X-ray film is obtained in the closed area to avoid external factors affecting the accuracy of the detection results.

[0067] The second sensors 6 are correspondingly arranged at the two ends of the submarine cable joint J and are arranged close to the inner side of the second positioning portion 11b, wherein each sensor contacts the side of the axial end of the submarine cable joint J after positioning. In order to avoid detection errors, at least two second sensors 6 are provided on the side of each axial end to ensure that the submarine cable joint J does not move axially or circumferentially, thereby ensuring the positioning accuracy of the submarine cable joint J and also ensuring that the submarine cable joint does not shift. In this way, omissions or duplications are avoided in multiple X-ray films, thereby ensuring the accuracy of the detection results.

[0068] At the same time, the setting of the first sensor 5 and the second sensor 6 can also facilitate the automatic detection of the X-ray machine. That is to say, after the submarine cable joint J is positioned, the cover 12 can be closed. Next, the X-ray film acquisition unit is flipped or moved horizontally in the closed area to obtain the required X-ray film at the corresponding angle of the joint part j. Then, by analyzing the image of the X-ray film to see if there is any abnormality, it is determined whether the internal structure of the joint part j is qualified, ensuring that qualified products are used in submarine cables, and greatly reducing the probability of damage to the submarine cable joint J after use.

[0069] In this example, a base 14 is formed at the bottom of the frame 1 , wherein four travel rollers 15 are distributed at the four corners of the base 14 .

[0070] In summary, the submarine cable joint performance detection method implemented in this embodiment includes the following steps:

[0071] 1) Acquisition of X-ray films: First, the joint parts at both ends of the submarine cable joint are suspended and set on opposite sides of the positioning seat, and the detection space is closed. Then, the X-ray detection area formed by the X-ray film acquisition unit composed of the irradiation end, the collection end and the connection part covers one of the joint parts, and the X-ray film acquisition unit gradually flips and moves axially in the same direction with the axis of the submarine cable joint. Starting from any fixed angle, an X-ray film of the pair of positions is acquired, and then flipped in the same direction, an X-ray film is taken every 15° until the flip angle reaches 180°. At this time, 13 circumferential X-ray films of the two joint parts at each flip angle can be acquired simultaneously, or 13 circumferential X-ray films of one joint part can be acquired first, and then 13 circumferential X-ray films of the other joint part can be acquired;

[0072] 2) X-ray film analysis, including (a) color comparison analysis, which compares the X-ray film images obtained in step 1), automatically identifies the grayscale difference in the gray area, and finds abnormal points, where air is white, the tested joint is gray, metal impurities are black, and bubbles are light gray; (b) size comparison analysis, which measures the size of the abnormal points found by color comparison analysis. If the measured size meets the qualified standard, it is judged to be qualified; otherwise, it is judged to be unqualified.

[0073] Therefore, this embodiment has the following advantages:

[0074] 1) Through the same-direction flipping and positioning of the X-ray detection area and under the coverage of the detection area, X-rays of the joint at various angles can be automatically acquired step by step. This not only ensures that the detection angles of the acquired X-rays will not overlap or be missed, but also can be acquired fully automatically;

[0075] 2) First, perform image color difference analysis to quickly find abnormal points, and then perform size comparison to determine whether the abnormal points are qualified, thereby ensuring that qualified products are used in submarine cables;

[0076] 3) By horizontally shifting the X-ray detection area, X-rays can be obtained at two joints in sequence or at the same angle in the same closed area, so as to quickly and accurately obtain X-rays of the submarine cable joint at various angles around the circumference.

[0077] 4) Using a closed cover, the X-ray film is obtained in a relatively closed cavity, avoiding external factors affecting the accurate acquisition of the X-ray film;

[0078] 5) Through the position distribution of the three movable guide wheels and the driving roller, the driving roller can be positioned on the arc guide rail without rotating, thereby meeting the acquisition of X-ray films at different angles and ensuring the accuracy of X-ray film acquisition;

[0079] 6) Under the setting of the first sensor, ensure that X-rays are obtained in a closed area to avoid external factors affecting the accuracy of the test results; under the setting of the second sensor, ensure the positioning accuracy of the submarine cable joint, and also ensure that the submarine cable joint will not shift. In this way, omissions or duplications are avoided in the 13 X-rays, thereby ensuring the accuracy of the test results. At the same time, it can also facilitate the implementation of automated detection of the X-ray machine.

[0080] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable people familiar with this technology to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for obtaining X-ray films for submarine cable joint performance testing, wherein the X-ray machine used comprises a frame, a positioning base, and an X-ray film acquisition unit, wherein the X-ray film acquisition unit comprises an irradiation end, a collection end, and a connection portion, and is characterized by: The frame seat includes a frame frame and a truss, a cover that can be opened or closed is formed on the frame frame, the truss includes a main board extending along the length direction of the submarine cable joint after positioning, end plates arranged at both ends of the main board, the connecting part is slidably arranged on the truss, the joint parts at both ends of the submarine cable joint are suspended and arranged on opposite sides of the positioning seat, an X-ray detection area that can cover the detected joint parts is formed between the irradiation end and the collection end, the X-ray machine also includes a first driving unit, the first driving unit includes an arc segment guide rail with the center of the submarine cable joint positioned on the positioning seat as the center of the circle, a movable guide wheel arranged on the truss and capable of matching the arc segment guide rail, a driving motor arranged on the truss, and a driving roller arranged at the output end of the driving motor and matched with the arc segment guide rail, wherein there are multiple movable guide wheels and they are correspondingly distributed on the inner and outer sides of the arc segment guide rail, the movable guide wheels are divided into two groups, and each group of movable guide wheels is correspondingly arranged on the end plate, and the X-ray film acquisition method includes the following steps: First, suspend the joints at both ends of the submarine cable joint on opposite sides of the positioning seat and close the detection space. At this time, the X-ray detection area covers the joint part to be tested. The driving roller rolls relative to the circular arc guide rail, and the truss flips relative to each other. After each flip of N°, the driving roller and the movable guide wheel position the truss and the circular arc guide rail relative to each other at the corresponding flipping position, and at the same time obtain an X-ray film at the corresponding position; After the flipping is kept in the same direction and the sum of the flipping angles is equal to 180°, the acquisition of X-ray films corresponding to the positions of the corresponding joint parts with successively changing circumferential angles is completed.

2. The X-ray film acquisition method for submarine cable joint performance testing according to claim 1, characterized in that: In step 2), 10≤N≤20, and the truss is flipped at the same angle each time.

3. The X-ray film acquisition method for submarine cable joint performance testing according to claim 1, characterized in that: There are two circular arc section guide rails, which are correspondingly arranged on the inner walls of the frame frame on both sides of the positioning seat.

4. The X-ray film acquisition method for submarine cable joint performance testing according to claim 3, characterized in that: Each of the arc segment guide rails includes an arc track frame and an arc track, wherein the arc track frame is fixed to the inner wall of the frame frame, a wheel groove matching the arc track is formed on the movable guide wheel, and the driving roller rolls on the inner wall of the arc track frame.

5. The X-ray film acquisition method for submarine cable joint performance testing according to claim 4, characterized in that: The cross section of the wheel groove is V-shaped.

6. The X-ray film acquisition method for submarine cable joint performance testing according to claim 4, characterized in that: Each group of the movable guide wheels has three, and the three movable guide wheels are distributed in a triangle shape, and the wheel center of the driving roller is located in the area formed by the three movable guide wheels.

7. The X-ray film acquisition method for submarine cable joint performance testing according to claim 6, characterized in that: Two of the three movable guide wheels are located on the inner side of the circular arc track, and one is located on the outer side of the circular arc track.

8. The X-ray film acquisition method for submarine cable joint performance testing according to claim 1, characterized in that: The X-ray machine also includes a second driving unit that drives the X-ray film acquisition unit to move relative to the truss to realize the displacement of the X-ray detection area between the two joint parts. The X-ray film acquisition method also includes step 4), which completes the circumferential X-ray acquisition of one joint part, and the second driving unit drives the X-ray film acquisition unit to move to another joint part, and repeats the above steps 2) and 3) to complete the X-ray film acquisition of the other joint part.

9. The X-ray film acquisition method for submarine cable joint performance testing according to claim 1, characterized in that: The positioning seat comprises a first positioning portion fixed in the frame seat and positioned from the middle of the submarine cable joint, and a second positioning portion located on opposite sides of the first positioning portion and for the ends of the submarine cable joint to pass through and be positioned.

10. The X-ray film acquisition method for submarine cable joint performance testing according to claim 1, characterized in that: The X-ray machine further comprises a first sensor for monitoring the closing state of the cover, and a second sensor for monitoring the positioning and displacement state of the submarine cable joint.

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