Automatic penetration detection device for LNG (Liquefied Natural Gas)

Abstract

The utility model belongs to the technical field of LNG (Liquefied Natural Gas) storage tanks, and particularly relates to an LNG automatic penetration detection device which comprises a movable shell, a penetrant water tank, a cleaning water tank and a developer water tank which are fixedly arranged at the upper part of the movable shell, and a monitoring marking mechanism is arranged on one side of the moving shell, an automatic spraying mechanism is arranged on the upper portion of the moving shell, a moving mechanism is arranged in the moving shell, and an adsorption mechanism is further arranged in the moving shell. According to the automatic penetration detection device for the LNG, the monitoring marking mechanism is arranged to monitor and mark weld joints on the inner wall of the LNG storage tank, the automatic spraying mechanism is used for spraying a penetrating agent, cleaning water and a developer on the inner wall of the LNG storage tank, the adsorption mechanism enables a movable shell to be adsorbed on the inner wall of the LNG storage tank, and the movable mechanism enables the movable shell to move on the inner wall of the LNG storage tank; and different places can be detected.

Description

Technical Field

[0001] This utility model relates to the field of LNG storage tank technology, and in particular to an automatic LNG permeation detection device. Background Technology

[0002] LNG storage tanks are special containers used to store liquefied natural gas, which is the process of cooling natural gas (mainly methane) to about -162°C at normal pressure, changing it from a gaseous state to a liquid state.

[0003] Inspection of weld seams on the inner wall of LNG storage tanks is a crucial step in ensuring the safety and reliability of the tanks. LNG storage tanks are generally quite large, consisting of two layers: an outer tank made of concrete and an inner tank made of metal. The tanks are typically 80 meters in diameter and 51 meters high. Considering safety concerns, an automated penetrant testing device is needed to perform penetrant testing on the weld seams of the inner tank wall. Utility Model Content

[0004] Based on the safety issues of existing manual inspection techniques, this utility model proposes an automatic LNG permeation detection device.

[0005] This utility model proposes an automatic LNG permeation detection device, comprising a movable shell, a permeate tank fixedly installed on the upper part of the movable shell, a cleaning tank fixedly installed on the upper part of the movable shell, a developer tank fixedly installed on the upper part of the movable shell, a monitoring and marking mechanism provided on one side of the movable shell, an automatic spraying mechanism provided on the upper part of the movable shell, a moving mechanism provided inside the movable shell, and an adsorption mechanism provided inside the movable shell.

[0006] Preferably, the monitoring and marking mechanism includes a support plate, which is fixedly installed at one end of the movable shell. A high-definition camera is provided at the lower part of the support plate, a paint tank is fixedly installed at the upper part of the movable shell, and a water pump is fixedly installed at the upper part of the movable shell. The inlet of the water pump is fixedly connected to the outlet of the paint tank, and a spray pipe is fixedly connected to the outlet of the water pump. The spray pipe passes through and extends out of the lower part of the support plate.

[0007] The above technical solution involves setting up a high-definition camera to promptly feed the inspected weld conditions back to a computer for human inspection. A water pump is also installed, and the high-definition camera is used to inspect the weld conditions. When a problem is found, the water pump is activated, and pigment from the pigment box is sprayed out through a spray pipe to mark the problematic areas of the weld on the inner wall of the LNG storage tank.

[0008] Preferably, the automatic spraying mechanism includes a support block, which is fixedly installed on the upper side of the movable shell. A second water pump, a third water pump, and a fourth water pump are fixedly installed on the upper part of the movable shell. The inlet of the second water pump is fixedly connected to the outlet of the penetrant tank. The inlet of the third water pump is fixedly connected to the outlet of the cleaning tank. The inlet of the fourth water pump is fixedly connected to the outlet of the developer tank. A second spraying pipe is fixedly connected to the outlet of the second water pump. A third spraying pipe is fixedly connected to the outlet of the third water pump. A fourth spraying pipe is fixedly connected to the outlet of the fourth water pump. The second, third, and fourth spraying pipes all penetrate and extend beyond the outside of the support block.

[0009] The above technical solution involves setting up pump two, pump three, and pump four. Pump two is started to spray the penetrant onto the weld seam of the LNG storage tank through spray pipe two. After 10 minutes, pump three is started to spray the cleaning water in the cleaning water tank through spray pipe three to clean the weld seam. After the weld seam dries, pump four is started to spray the developer in the developer water tank through spray pipe four to apply the developer to the weld seam.

[0010] Preferably, the adsorption mechanism includes a vacuum pump, two vacuum pumps are respectively fixedly installed on both sides of the bottom surface of the movable shell, and air inlet ends on both sides of the vacuum pump are respectively fixedly connected to suction pipes. The suction pipes penetrate and extend out of the lower part of the movable shell, and one end of the suction pipe is fixedly connected to a vacuum suction cup. The lower surface of the vacuum suction cup is in pressure contact with the inner wall of the LNG storage tank.

[0011] The above technical solution involves setting up a vacuum pump and starting the vacuum pump to extract air from the vacuum suction cup. After the vacuum pump removes the air from the vacuum suction cup, a low-pressure area is formed inside the vacuum suction cup, creating a pressure difference with the external atmospheric pressure. This pressure difference causes the vacuum suction cup to adhere tightly to the surface of the object, allowing the movable shell to adhere to the inner wall of the LNG storage tank.

[0012] Preferably, the moving mechanism includes drive wheels, a fixing hole is provided at the bottom of the moving shell, a mounting block 1 is fixedly installed on the inner bottom surface of the moving shell, and a drive shaft is rotatably connected to the outer surfaces of the two mounting blocks 1 via ball bearings. The two ends of the drive shaft pass through and extend out of the two mounting blocks 1 respectively. The two drive wheels are fixedly installed on the arc surfaces at both ends of the drive shaft. The arc surfaces of the drive wheels roll in contact with the inner wall of the LNG storage tank through the fixing hole. A gear 1 is fixedly connected to the arc surface in the middle of the drive shaft. A mounting plate is fixedly installed on the inner bottom surface of the moving shell. A motor is fixedly installed on one side of the mounting plate. A rotating shaft is rotatably connected to one side surface of the mounting plate via ball bearings. The output end of the motor is fixedly connected to one end of the rotating shaft via a coupling. A gear 2 is fixedly connected to the arc surface of the rotating shaft. The tooth groove of the gear 2 meshes with the tooth of the gear 1.

[0013] The above technical solution involves setting up a motor, starting the motor to drive the rotating shaft and gear two to rotate, gear two meshes with gear one, causing gear two to drive gear one to rotate, gear one to adjust the drive shaft to rotate, causing the drive wheel to rotate, so that the movable shell can move on the inner wall of the LNG storage tank.

[0014] Preferably, a second mounting block is fixedly installed on the inner bottom surface of the movable shell. The surfaces of the two second mounting blocks are rotatably connected to a fixed shaft via ball bearings. One end of the fixed shaft extending outside the second mounting block is rotatably connected to a steering shaft via a pin. One end of the steering shaft has an arcuate surface rotatably connected to a steering wheel via ball bearings. The arcuate surface of the steering wheel rolls in contact with the inner wall of the LNG storage tank through the fixed hole. An electric telescopic rod is fixedly installed on the inner bottom surface of the movable shell. The telescopic end of the electric telescopic rod is fixedly connected to the arcuate surface of the steering shaft.

[0015] The above technical solution involves setting up an electric telescopic rod. The extension and retraction of the electric telescopic rod can cause the steering shaft to rotate around one end of the fixed shaft, thereby changing the direction of the steering wheel and enabling the moving shell to steer and move within the LNG storage tank.

[0016] The beneficial effects of this utility model are as follows:

[0017] By setting up a monitoring and marking mechanism, staff can remotely view the weld condition on a computer and mark any problematic areas. An automatic spraying mechanism is set up to spray penetrant, cleaning water, and developer onto the inner wall of the LNG storage tank. An adsorption mechanism is set up to allow the mobile shell to adhere to the inner wall of the LNG storage tank. A moving mechanism is set up to allow the mobile shell to move along the inner wall of the LNG storage tank, enabling comprehensive penetration testing of the inner wall of the LNG storage tank. This solves the safety technical problems of existing manual inspection methods. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of an automatic LNG permeation detection device proposed in this utility model;

[0019] Figure 2 This is a three-dimensional view of the high-definition camera structure of an automatic LNG permeation detection device proposed in this utility model;

[0020] Figure 3 This is a three-dimensional view of the vacuum pump structure of an automatic LNG permeation detection device proposed in this utility model;

[0021] Figure 4 This is an enlarged view of point A of the LNG automatic permeation detection device proposed in this utility model;

[0022] Figure 5 This is an enlarged view of section B of an automatic LNG permeation detection device proposed in this utility model.

[0023] In the diagram: 1. Moving shell; 2. Penetrant tank; 3. Cleaning tank; 4. Developer tank; 5. Support plate; 6. High-definition camera; 7. Pigment tank; 8. Water pump one; 9. Spray pipe one; 10. Support block; 11. Water pump two; 12. Water pump three; 13. Water pump four; 14. Spray pipe two; 15. Spray pipe three; 16. Spray pipe four; 17. Vacuum pump; 18. Suction pipe; 19. Vacuum suction cup; 20. Drive wheel; 21. Fixing hole; 22. Mounting block one; 23. Drive shaft; 24. Gear one; 25. Mounting plate; 26. Motor; 27. Rotating shaft; 28. Gear two; 29. ​​Mounting block two; 30. Fixing shaft; 31. Steering shaft; 32. Steering wheel; 33. Electric telescopic rod. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Reference Figures 1-5 An automatic LNG permeation detection device includes a movable shell 1, a permeate tank 2 fixedly installed on the upper part of the movable shell 1, a cleaning tank 3 fixedly installed on the upper part of the movable shell 1, a developer tank 4 fixedly installed on the upper part of the movable shell 1, a monitoring marking mechanism provided on one side of the movable shell 1, an automatic spraying mechanism provided on the upper part of the movable shell 1, a moving mechanism provided inside the movable shell 1, and an adsorption mechanism also provided inside the movable shell 1.

[0026] To inspect and mark the welds on the inner wall of the LNG storage tank, a monitoring and marking mechanism is installed. The monitoring and marking mechanism includes a support plate 5, which is fixedly installed at one end of the movable shell 1. A high-definition camera 6 is installed at the lower part of the support plate 5. A paint tank 7 is fixedly installed at the upper part of the movable shell 1. A water pump 8 is fixedly installed at the upper part of the movable shell 1. The water inlet of the water pump 8 is fixedly connected to the water outlet of the paint tank 7. A spray pipe 9 is fixedly connected to the water outlet of the water pump 8. The spray pipe 9 passes through and extends out of the lower part of the support plate 5.

[0027] By setting up a high-definition camera 6, the condition of the inspected weld can be fed back to the computer for human inspection in a timely manner. A water pump 8 is set up so that the condition of the weld can be inspected through the high-definition camera 6. When a problem is found, the water pump 8 is started and the pigment in the pigment box 7 is sprayed out through the spray pipe 9 to mark the problematic areas of the weld on the inner wall of the LNG storage tank.

[0028] To spray penetrant, cleaning water, and developer onto the inner wall of the LNG storage tank, an automatic spraying mechanism is installed. This mechanism includes a support block 10, which is fixedly installed on the upper side of the movable shell 1. A second water pump 11, a third water pump 12, and a fourth water pump 13 are also fixedly installed on the upper part of the movable shell 1. The inlet of the second water pump 11 is fixedly connected to the outlet of the penetrant tank 2. The inlet of water pump 3 12 is fixedly connected to the outlet of cleaning water tank 3, the inlet of water pump 4 13 is fixedly connected to the outlet of developer water tank 4, the outlet of water pump 2 11 is fixedly connected to spray pipe 2 14, the outlet of water pump 3 12 is fixedly connected to spray pipe 3 15, and the outlet of water pump 4 13 is fixedly connected to spray pipe 4 16. Spray pipe 2 14, spray pipe 3 15 and spray pipe 4 16 all penetrate and extend out of the outside of support block 10.

[0029] By setting up pumps 21, 32, and 43, pump 211 is started to spray the penetrant onto the weld seam of the LNG storage tank inner wall through spray pipe 214. After 10 minutes, pump 312 is started to spray the cleaning water in cleaning tank 3 through spray pipe 315 to clean the weld seam. After the weld seam dries, pump 413 is started to spray the developer in developer tank 4 through spray pipe 416 to spray the weld seam with developer.

[0030] In order to enable the mobile shell 1 to adhere to the inner wall of the LNG storage tank, an adsorption mechanism is provided. The adsorption mechanism includes a vacuum pump 17. Two vacuum pumps 17 are respectively fixedly installed on both sides of the bottom surface of the mobile shell 1. The air inlet ends of the vacuum pumps 17 are respectively fixedly connected to suction pipes 18. The suction pipes 18 penetrate through and extend out of the lower part of the mobile shell 1. One end of the suction pipe 18 is fixedly connected to a vacuum suction cup 19. The lower surface of the vacuum suction cup 19 is in contact with the inner wall of the LNG storage tank.

[0031] By setting up a vacuum pump 17, the vacuum pump 17 is started to extract the air inside the vacuum suction cup 19. After the vacuum pump 17 extracts the air from the vacuum suction cup 19, a low-pressure area is formed inside the vacuum suction cup 19, which creates a pressure difference with the external atmospheric pressure. This pressure difference causes the vacuum suction cup 19 to adhere tightly to the surface of the object, so that the movable shell 1 can adhere to the inner wall of the LNG storage tank.

[0032] To enable the movable shell 1 to move along the inner wall of the LNG storage tank for permeation testing, a moving mechanism is provided. This mechanism includes drive wheels 20. A fixing hole 21 is provided at the bottom of the movable shell 1. Mounting blocks 22 are fixedly mounted on the inner bottom surface of the movable shell 1. Drive shafts 23 are rotatably connected to the outer surfaces of the two mounting blocks 22 via ball bearings. Both ends of the drive shafts 23 penetrate and extend beyond the outer surfaces of the two mounting blocks 22. Two drive wheels 20 are fixedly mounted on the arcuate surfaces at both ends of the drive shafts 23. The arc surface makes rolling contact with the inner wall of the LNG storage tank through the fixing hole 21. Gear 24 is fixedly connected to the arc surface in the middle of the drive shaft 23. Mounting plate 25 is fixedly installed on the bottom surface of the inner wall of the movable shell 1. Motor 26 is fixedly installed on one side of mounting plate 25. Rotary shaft 27 is rotatably connected to one side surface of mounting plate 25 through ball bearing. The output end of motor 26 is fixedly connected to one end of rotating shaft 27 through coupling. Gear 28 is fixedly connected to the arc surface of rotating shaft 27. The tooth groove of gear 28 meshes with the tooth of gear 24.

[0033] By setting up motor 26, starting motor 26 drives rotating shaft 27 and gear 28 to rotate. Gear 28 meshes with gear 1 24, causing gear 28 to drive gear 1 24 to rotate. Gear 1 24 adjusts drive shaft 23 to rotate, causing drive wheel 20 to rotate, so that movable shell 1 can move on the inner wall of LNG storage tank.

[0034] To enable the movable shell 1 to steer on the inner wall of the LNG storage tank, mounting blocks 29 are fixedly installed on the inner bottom surface of the movable shell 1. The surfaces of the two mounting blocks 29 are rotatably connected to fixed shafts 30 via ball bearings. One end of the fixed shaft 30 extending outside the mounting blocks 29 is rotatably connected to a steering shaft 31 via a pin. One end of the steering shaft 31 has a circular arc surface rotatably connected to a steering wheel 32 via ball bearings. The circular arc surface of the steering wheel 32 rolls in contact with the inner wall of the LNG storage tank through a fixing hole 21. An electric telescopic rod 33 is fixedly installed on the inner bottom surface of the movable shell 1. The telescopic end of the electric telescopic rod 33 is fixedly connected to the circular arc surface of the steering shaft 31.

[0035] By setting up an electric telescopic rod 33, the extension and retraction of the electric telescopic rod 33 can cause the steering shaft 31 to rotate around one end of the fixed shaft 30, thereby changing the direction of the steering wheel 32 and enabling the movable shell 1 to rotate and move inside the LNG storage tank.

[0036] Working principle: First, the movable shell 1 is placed on the inner wall of the LNG storage tank. Then, the vacuum pump 17 is started to extract the air from the vacuum suction cup 19. After the vacuum pump 17 removes the air from the vacuum suction cup 19, a low-pressure area is formed inside the vacuum suction cup 19, creating a pressure difference with the external atmospheric pressure. This pressure difference causes the vacuum suction cup 19 to adhere tightly to the surface of the object, allowing the movable shell 1 to adhere to the inner wall of the LNG storage tank. The motor 26 is started, driving gear 28 to rotate, which in turn drives gear 24 to rotate, causing the drive shaft 23 to drive the drive wheel 20 to rotate. The drive wheel 20 slides in contact with the inner wall of the LNG storage tank. The rotation of the drive wheel 20 allows the movable shell 1 to move along the weld seam on the inner wall of the LNG storage tank. The water pump 11 is started to spray the penetrant onto the inner wall of the LNG storage tank through the spray pipe 14. On the weld, after 10 minutes, water pump 312 is started to spray the cleaning water in cleaning tank 3 through spray pipe 315 to clean the weld. After the weld dries, water pump 413 is started to spray the developer in developer tank 4 through spray pipe 416 to spray the weld. During the movement, the high-definition camera 6 under the support plate 5 allows the staff to inspect the weld on the computer. If a problem is found, water pump 8 is started to spray the pigment in pigment tank 7 onto the problematic area to mark and locate it, so that the staff can easily understand where the problem is. When it is necessary to perform penetration testing on other areas, the electric telescopic rod 33 is started to drive the steering shaft 31 to rotate, causing the steering wheel 32 to deflect, so that the moving shell 1 can adjust its direction to perform penetration testing on other welds.

[0037] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. An automatic LNG permeation detection device, comprising a movable housing (1), characterized in that: A penetrant tank (2) is fixedly installed on the upper part of the mobile shell (1), a cleaning tank (3) is fixedly installed on the upper part of the mobile shell (1), a developer tank (4) is fixedly installed on the upper part of the mobile shell (1), a monitoring marking mechanism is provided on one side of the mobile shell (1), an automatic spraying mechanism is provided on the upper part of the mobile shell (1), a moving mechanism is provided inside the mobile shell (1), and an adsorption mechanism is also provided inside the mobile shell (1). The monitoring and marking mechanism enables the monitoring and marking of the weld seams on the inner wall of the LNG storage tank; The automatic spraying mechanism performs the spraying of penetrant, cleaning water and developer on the inner wall of the LNG storage tank; The adsorption mechanism enables the movable shell to adsorb onto the inner wall of the LNG storage tank. The moving mechanism enables the moving shell to move in four directions on the inner wall of the LNG storage tank.

2. The LNG automatic permeation detection device according to claim 1, characterized in that: The monitoring and marking mechanism includes a support plate (5), which is fixedly installed at one end of the movable shell (1). A high-definition camera (6) is provided at the lower part of the support plate (5). A paint box (7) is fixedly installed at the upper part of the movable shell (1). A water pump (8) is fixedly installed at the upper part of the movable shell (1). The water inlet of the water pump (8) is fixedly connected to the water outlet of the paint box (7). A spray pipe (9) is fixedly connected to the water outlet of the water pump (8). The spray pipe (9) passes through and extends out of the lower part of the support plate (5).

3. The LNG automatic permeation detection device according to claim 1, characterized in that: The automatic spraying mechanism includes a support block (10), which is fixedly installed on the upper side of the movable shell (1). A second water pump (11), a third water pump (12), and a fourth water pump (13) are fixedly installed on the upper part of the movable shell (1). The inlet of the second water pump (11) is fixedly connected to the outlet of the penetrant tank (2), and the inlet of the third water pump (12) is connected to the cleaning tank (3). The water outlet of the pump is fixedly connected, the water inlet of the pump four (13) is fixedly connected to the water outlet of the developer water tank (4), the water outlet of the pump two (11) is fixedly connected to the spray pipe two (14), the water outlet of the pump three (12) is fixedly connected to the spray pipe three (15), the water outlet of the pump four (13) is fixedly connected to the spray pipe four (16), and the spray pipe two (14), the spray pipe three (15) and the spray pipe four (16) all penetrate and extend out of the outside of the support block (10).

4. The LNG automatic permeation detection device according to claim 1, characterized in that: The adsorption mechanism includes a vacuum pump (17), two vacuum pumps (17) are respectively fixedly installed on both sides of the bottom surface of the movable shell (1), and the air inlet ends of the vacuum pumps (17) are respectively fixedly connected to suction pipes (18). The suction pipes (18) penetrate through and extend out of the lower part of the movable shell (1), and one end of the suction pipes (18) is fixedly connected to a vacuum suction cup (19). The lower surface of the vacuum suction cup (19) is in contact with the inner wall of the LNG storage tank.

5. The LNG automatic permeation detection device according to claim 1, characterized in that: The moving mechanism includes a drive wheel (20), and a fixing hole (21) is provided at the bottom of the moving shell (1). An installation block (22) is fixedly installed on the inner bottom surface of the moving shell (1). The outer surfaces of the two installation blocks (22) are rotatably connected to a drive shaft (23) through ball bearings. The two ends of the drive shaft (23) pass through and extend out of the two installation blocks (22). The two drive wheels (20) are fixedly installed on the arc surfaces at both ends of the drive shaft (23). The arc surfaces of the drive wheels (20) roll in contact with the inner wall of the LNG storage tank through the fixing hole (21).

6. An automatic LNG permeation detection device according to claim 5, characterized in that: Gear 1 (24) is fixedly connected to the arc surface in the middle of the drive shaft (23). An installation plate (25) is fixedly installed on the bottom surface of the movable housing (1). A motor (26) is fixedly installed on one side of the installation plate (25). A rotating shaft (27) is rotatably connected to one side surface of the installation plate (25) through a ball bearing. The output end of the motor (26) is fixedly connected to one end of the rotating shaft (27) through a coupling. Gear 2 (28) is fixedly connected to the arc surface of the rotating shaft (27). The tooth groove of gear 2 (28) meshes with the tooth of gear 1 (24).

7. An automatic LNG permeation detection device according to claim 5, characterized in that: Mounting block two (29) is fixedly installed on the inner bottom surface of the movable shell (1). The surfaces of the two mounting blocks two (29) are rotatably connected to a fixed shaft (30) via ball bearings. One end of the fixed shaft (30) extending out of the mounting block two (29) is rotatably connected to a steering shaft (31) via a pin. One end of the steering shaft (31) is rotatably connected to a steering wheel (32) via a ball bearing. The arc surface of the steering wheel (32) is in rolling contact with the inner wall of the LNG storage tank through the fixed hole (21). An electric telescopic rod (33) is fixedly installed on the inner bottom surface of the movable shell (1). The telescopic end of the electric telescopic rod (33) is fixedly connected to the arc surface of the steering shaft (31).

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