Ray detection device of LNG (Liquefied Natural Gas) low-temperature storage tank

Abstract

The ray detection device for the LNG low-temperature storage tank comprises ray detection equipment and is characterized by further comprising a bearing frame, rollers are arranged at the upper end of the bearing frame, a mounting frame is connected to the rollers, hooks are arranged at the lower end of the mounting frame, a connecting hanging ring is hung on the hooks, a loading structure is arranged below the connecting hanging ring, and the loading structure is connected with the mounting frame. Combined grooves are formed in the two sides of the loading structure, and ray detection equipment is placed on the loading structure. The rollers drive the bearing frames to move automatically, the multiple sections of bearing frames can be spliced into a continuous track, continuous detection of circular seams is achieved, frequent manual movement of equipment is not needed, a single person can control the multiple sections of detection devices, the detection speed is increased by more than 50%, the device is suitable for batch detection of large storage tanks, and the detection efficiency is improved; the loading structure fixes the ray equipment through the fixing plate, the turnover plate and the limiting rod, the supporting legs and the universal wheels are tightly attached to the side wall of the storage tank, negative film blurring or digital image distortion caused by shaking is avoided, and the detection accuracy is improved to 99% or above.

Description

Technical Field

[0001] This utility model relates to the field of weld inspection of storage tanks, and in particular to a radiographic inspection device for LNG cryogenic storage tanks. Background Technology

[0002] LNG cryogenic storage tanks are used to store liquefied natural gas. Due to their extreme working environment (typically operating temperatures below -160°C) and the flammable and explosive nature of the stored medium, any minor structural defect or material failure can lead to catastrophic consequences. Therefore, it is crucial to conduct rigorous testing on LNG cryogenic storage tanks during the welding process.

[0003] X-ray inspection is a method of inspection that utilizes the fact that X-rays can penetrate metal materials. Due to the different absorption and scattering of X-rays by the materials, the film is exposed to different amounts of light, resulting in images of varying density on the film. This information is then used to determine the internal defects of the material.

[0004] Existing radiographic inspection methods for circumferential welds typically involve manual inspection of the weld seam using segmented photographs. Each person can only carry a limited number of inspection devices and consumables at a time, requiring frequent relocation and resulting in slow inspection speeds. Given the numerous weld points and seams in large LNG cryogenic storage tanks, the inspection efficiency is insufficient to meet engineering requirements. Furthermore, the inspection of LNG cryogenic storage tanks involves safety issues such as high-altitude operations and radiation protection. Manually carrying equipment can lead to equipment swaying and unstable placement. To address these problems, a radiographic inspection device for LNG cryogenic storage tanks is proposed. Utility Model Content

[0005] The purpose of this invention is to solve the problems of slow manual inspection efficiency and instability in high-altitude operations.

[0006] The present invention adopts the following technical solution:

[0007] A radiographic inspection device for an LNG cryogenic storage tank includes a radiographic inspection device, characterized in that it further includes a support frame, the upper end of which is provided with rollers, a mounting frame is connected to the rollers, the lower end of which is provided with hooks, a connecting ring is hung on the hooks, a loading structure is provided below the connecting rings, and a combination groove is provided on both sides of the loading structure, on which the radiographic inspection device is placed;

[0008] Furthermore, there are several support frames arranged in parallel and positioned by a positioning rod. The positioning rod has several slots that engage with the mounting bracket of the support frame. Adjacent support frames are connected by inserting support blocks into the combination slots on both sides of the loading structure. The combination slots and support blocks have pins that pass through to ensure the connection between the combination slots and support blocks.

[0009] Furthermore, the roller is located at the edge of the cryogenic storage tank, and the roller is connected to an external power source to drive the roller to move the entire support frame along the edge of the cryogenic storage tank;

[0010] Furthermore, the upper end of the mounting frame is equipped with a roller via a bearing, and the lower end is fixedly equipped with a hook. The upper half of the connecting ring is a ring part, which is used to connect with the hook of the mounting frame, and the lower half is a hook part, which is used to connect with the loading structure.

[0011] Furthermore, the loading structure includes a base plate with a placement groove for placing X-ray inspection equipment, a loading frame on the base plate with a connecting rod for connecting to the hook of a connecting ring, a fixing plate on the loading frame, a folding plate on the loading frame, and a support leg on the rear side of the loading frame with casters for contacting the side wall of the cryogenic storage tank.

[0012] Furthermore, the fixed plate has a concave groove for fitting with the X-ray inspection equipment, the folding plate is mounted on the loading frame via a rotating shaft, the folding plate has a concave groove corresponding to the concave groove on the fixed plate, the front ends of the fixed plate and the folding plate are provided with wedge grooves, and limit rods are provided in the two wedge grooves for limiting the folding plate;

[0013] Furthermore, there are several support legs, and each support leg is equipped with a caster wheel at its rear end;

[0014] Furthermore, both sides of the loading frame are provided with combination slots, the combination slots have insertion holes for pins, a support block is inserted into the combination slot, the support block has an opening for the pin to pass through, and the width of the support block and the combination slot is the same as the distance between two adjacent slots of the positioning rod.

[0015] The beneficial effects of this utility model are:

[0016] The automated movement of the support frame, driven by rollers, allows for the splicing of multiple sections into a continuous track, enabling continuous inspection of circumferential seams. This eliminates the need for frequent manual movement of equipment, allowing a single person to operate multiple sections of the inspection device. Inspection speed is increased by over 50%, making it suitable for batch inspection of large storage tanks and improving efficiency. The loading structure secures the X-ray equipment via fixed plates, folding plates, and limit rods. Support legs and casters are tightly fitted to the tank sidewall, ensuring a fixation error of ≤0.5mm. This prevents blurry film or distorted digital images caused by shaking, increasing inspection accuracy to over 99%. The device moves automatically along the tank edge via rollers, reducing the need for manual handling of equipment at heights. Operators can remotely control the device from the ground, avoiding the risk of falls from heights. The radiation protection distance can be extended to a safe range via remote control. The number of support frames can be flexibly assembled according to tank size, adapting to different specifications of LNG cryogenic storage tanks. It can cover circumferential seam inspection of various tank sizes without requiring customized equipment for different tanks, demonstrating strong versatility. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a radiation detection device for an LNG cryogenic storage tank according to a utility model.

[0018] Figure 2 This is a schematic diagram of the overall structure of a radiation detection device for an LNG cryogenic storage tank according to a utility model.

[0019] Figure 3 A schematic diagram of a single support frame for a radiographic inspection device for an LNG cryogenic storage tank, as per utility model.

[0020] Figure 4 This is a schematic diagram illustrating the specific structure and usage of a radiation detection device for an LNG cryogenic storage tank, as per the utility model.

[0021] Figure 5 This is a schematic diagram of the internal structure of a radiation detection device for an LNG cryogenic storage tank, which is a utility model.

[0022] Figure 6 A schematic diagram of the positioning rod structure of a radiographic inspection device for an LNG cryogenic storage tank, which is a utility model.

[0023] In the diagram: 1. X-ray inspection equipment; 2. Support frame; 3. Roller; 4. Mounting frame; 5. Hook; 6. Connecting ring; 7. Loading structure; 8. Connecting rod; 9. Base plate; 10. Placement slot; 11. Loading frame; 12. Fixing plate; 13. Folding plate; 14. Wedge groove; 15. Limiting rod; 16. Support leg; 17. Casters; 18. Combination slot; 19. Support block; 20. Pin; 21. Positioning rod; 22. Slot. Detailed Implementation

[0024] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0025] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0027] Example 1

[0028] This utility model provides a radiation detection device for LNG cryogenic storage tank, including radiation detection equipment 1 and a support frame 2. The upper end of the support frame 2 is provided with a roller 3, and a mounting frame 4 is connected to the roller 3. The lower end of the mounting frame 4 is provided with a hook 5, and a connecting ring 6 is hung on the hook 5. A loading structure 7 is provided below the connecting ring 6. Combination grooves 18 are provided on both sides of the loading structure 7. The radiation detection equipment 1 is placed on the loading structure 7.

[0029] Furthermore, there are several support frames 2, which are arranged in parallel and positioned by positioning rods 21. The positioning rods 21 have several slots 22, which engage with the mounting brackets 4 of the support frames 2. Adjacent support frames 2 are connected by inserting support blocks 19 into the combination slots 18 on both sides of the loading structure 7. Pins 20 pass through the combination slots 18 and the support blocks 19 to ensure the connection between the combination slots 18 and the support blocks 19.

[0030] Furthermore, the roller 3 is located at the edge of the cryogenic storage tank and is connected to an external power source to drive the roller 3 to move the overall support frame 2 along the edge of the cryogenic storage tank.

[0031] Furthermore, the upper end of the mounting frame 4 is equipped with a roller 3 via a bearing, and the lower end is fixedly equipped with a hook 5. The upper half of the connecting ring 6 is a ring part, which is used to connect with the hook 5 of the mounting frame 4, and the lower half is a hook part, which is used to connect with the loading structure 7.

[0032] Furthermore, the loading structure 7 includes a base plate 9, on which a placement groove 10 is provided for placing the X-ray inspection equipment 1. A loading frame 11 is provided on the base plate 9, and a connecting rod 8 is provided on the loading frame 11 for connecting with the hook of the connecting hanging ring 6. A fixing plate 12 is provided on the loading frame 11, and a folding plate 13 is provided on the loading frame 11. A support leg 16 is provided on the rear side of the loading frame 11, and a caster wheel 17 is provided on the support leg 16 for contacting the side wall of the cryogenic storage tank.

[0033] Furthermore, the fixing plate 12 has a concave groove for fitting with the X-ray inspection equipment 1, and the folding plate 13 is mounted on the loading frame 11 via a rotating shaft. The folding plate 13 has a concave groove corresponding to the concave groove on the fixing plate 12. Both the fixing plate 12 and the folding plate 13 have wedge grooves 14 at their front ends. Limiting rods 15 are provided in the two wedge grooves 14 for limiting the folding plate 13.

[0034] Furthermore, there are several support legs 16, and each support leg 16 is equipped with a caster wheel 17 at its rear end;

[0035] Furthermore, both sides of the loading frame 11 are provided with combination slots 18. The combination slots 18 have insertion holes for the pins 20. A support block 19 is inserted into the combination slots 18. The support block 19 has an opening for the pins 20 to pass through. The width of the support block 19 and the combination slot 18 is the same as the distance between two adjacent slots 22 of the positioning rod 21.

[0036] Working principle:

[0037] In use, the cryogenic storage tank is constructed by stacking layers of iron plates. Rollers 3 on the support frame 2 rest on the edge of the cryogenic storage tank. The connecting ring 6 is connected to the hook 5 of the mounting frame 4, and then the loading structure 7 is connected to the connecting ring 6. The connecting rod 8 on the loading frame 11 is connected to the hook of the connecting ring 6. The X-ray inspection device 1 is placed in the placement groove 10 of the base plate 9, with one side of the X-ray inspection device 1 abutting against the concave groove of the fixing plate 12. The folding plate 13 is rotated via a pivot, causing its concave groove to fit against the X-ray inspection device 1. The limiting rod 15 is then inserted into the wedge-shaped grooves 14 at the front of the fixing plate 12 and the folding plate 13 via wedge blocks at both ends to fix the X-ray inspection device 1, ensuring its stability. The casters 17 on the support legs 16 rest against the side wall of the cryogenic storage tank. With the support of the support legs 16 and the mounting frame 4, the entire support frame 2 remains vertical. This keeps the X-ray inspection equipment 1 vertical. Several support frames 2 are spliced ​​together, and adjacent support frames 2 are connected by combination slots 18 on both sides of the loading frame 11. Support blocks 19 are inserted into the combination slots 18, and pins 20 are used to pass through the insertion holes of the combination slots 18 and support blocks 19. At the same time, the positioning rod 21 is snapped onto the mounting frame 4 through the slot 22 to ensure a stable connection, forming an inspection track extending along the edge of the storage tank. The power supply of the rollers 3 is turned on, and the rollers 3 drive the entire device to move along the circumferential seam of the storage tank. At the same time, the X-ray inspection equipment 1 emits X-rays according to preset parameters to continuously scan and image the weld. During the inspection process, the universal wheels 17 of the support legs 16 are always in contact with the side wall of the storage tank to ensure the stability of the equipment. If the length of the circumferential seam of the storage tank is long, the number of support frames 2 can be increased, and the inspection track can be extended by using the combination slots 18 and support blocks 19 to achieve segmented continuous inspection of long welds and avoid frequent manual disassembly and assembly of the equipment.

[0038] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. The various components mentioned in this utility model are common technologies in the existing field. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A radiographic inspection device for an LNG cryogenic storage tank, comprising radiographic inspection equipment (1), characterized in that, It also includes a support frame (2), the upper end of which is provided with a roller (3), a mounting frame (4) is connected to the roller (3), the lower end of the mounting frame (4) is provided with a hook (5), a connecting ring (6) is hung on the hook (5), a loading structure (7) is provided below the connecting ring (6), and a combination groove (18) is provided on both sides of the loading structure (7), and a radiation detection device (1) is placed on the loading structure (7).

2. The X-ray inspection device for an LNG cryogenic storage tank according to claim 1, characterized in that, There are several support frames (2), which are arranged in parallel and positioned by positioning rods (21). The positioning rods (21) have several slots (22), which are engaged with the mounting brackets (4) of the support frames (2). Adjacent support frames (2) are connected by inserting support blocks (19) into the combination slots (18) on both sides of the loading structure (7). Pins (20) pass through the combination slots (18) and the support blocks (19) to ensure the connection between the combination slots (18) and the support blocks (19).

3. The X-ray inspection device for an LNG cryogenic storage tank according to claim 2, characterized in that, The roller (3) is located at the edge of the cryogenic storage tank. The roller (3) is connected to an external power source to drive the roller (3) to move the overall support frame (2) along the edge of the cryogenic storage tank.

4. The X-ray inspection device for an LNG cryogenic storage tank according to claim 3, characterized in that, The upper end of the mounting frame (4) is provided with a roller (3) via a bearing, and the lower end is fixedly provided with a hook (5). The upper half of the connecting ring (6) is a ring part, which is used to connect with the hook (5) of the mounting frame (4), and the lower half is a hook part, which is used to connect with the loading structure (7).

5. The X-ray inspection device for an LNG cryogenic storage tank according to claim 4, characterized in that, The loading structure (7) includes a base plate (9), on which a placement groove (10) is provided for placing the X-ray inspection equipment (1), on which a loading frame (11) is provided, on which a connecting rod (8) is provided for connecting to the hook of the connecting ring (6), on which a fixing plate (12) is provided, on which a folding plate (13) is provided, on which a support leg (16) is provided on the rear side of the loading frame (11), and on which a caster wheel (17) is provided for contacting the side wall of the cryogenic storage tank.

6. The X-ray inspection device for an LNG cryogenic storage tank according to claim 5, characterized in that, The fixed plate (12) has a concave groove for fitting with the X-ray inspection equipment (1). The folding plate (13) is mounted on the loading frame (11) via a rotating shaft. The folding plate (13) has a concave groove corresponding to the concave groove on the fixed plate (12). Both the fixed plate (12) and the folding plate (13) have wedge-shaped grooves (14) at their front ends. Limiting rods (15) are provided in the two wedge-shaped grooves (14) for limiting the folding plate (13).

7. The X-ray inspection device for an LNG cryogenic storage tank according to claim 6, characterized in that, There are several support legs (16), and each support leg (16) is provided with a caster wheel (17) at its rear end.

8. The X-ray inspection device for an LNG cryogenic storage tank according to claim 7, characterized in that, The loading frame (11) is provided with combination slots (18) on both sides. The combination slots (18) have insertion holes for pins (20). A support block (19) is inserted into the combination slots (18). The support block (19) has an opening for the pin (20) to pass through. The width of the support block (19) and the combination slots (18) is the same as the distance between two adjacent slots (22) of the positioning rod (21).

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