Inspection device for FPSO ship body welding seam air tightness and use method thereof

Abstract

The invention discloses an FPSO ship body welding seam airtightness inspection device, which comprises a supporting frame, a rotating assembly is arranged on the rear side of the supporting frame, a rotating frame is arranged on the supporting frame through the rotating assembly, a partition plate is fixedly arranged on the front side of the rotating frame, and a fixing frame is fixedly arranged on the left side of the partition plate. The device comprises a fixing frame, a driving assembly is arranged in the fixing frame, the fixing frame is provided with a hydraulic push rod through the driving assembly, a sealing box is fixedly arranged at the extension end of the hydraulic push rod, a groove is formed in the sealing box, a sealing ring is fixedly arranged in the groove, and an air pressure sensor is fixedly arranged on the surface of the sealing box. The sensing end of the air pressure sensor penetrates through the sealing box and extends into the sealing box, the fixing frame is provided with a first nozzle and a second nozzle through the driving assembly, the device can conduct air tightness inspection on the welding seam after all sections of the FPSO ship body are closed, and meanwhile the position of a leakage point on the surface of the welding seam can be rapidly identified.

Description

Technical Field

[0001] The invention relates to the technical field of FPSO hull weld detection, and in particular to a device for detecting air tightness of FPSO hull welds and a use method thereof. Background Art

[0002] FPSO hull is the hull of a floating production storage and offloading unit. It is the main part of an offshore oil and gas production facility. The FPSO hull can provide a stable offshore platform for installing oil extraction and processing equipment. The FPSO hull weld refers to the joint formed by connecting various steel plates, profiles and other components through welding during the construction of the FPSO hull. Because the FPSO hull is huge in size, it is impossible to manufacture it with a whole piece of material. It is necessary to splice many metal components together. Welding is an efficient and reliable connection method. Through welding, the hull structure can be formed into a whole to ensure the strength and sealing of the hull.

[0003] The reason why FPSO hull welds are subjected to pressure and air-tightness testing is that FPSO stores a large amount of crude oil and processes flammable and explosive oil and gas at sea. If there is a leakage channel in the weld, oil and gas leakage will occur, causing fire and explosion accidents, endangering the safety of personnel and the marine environment. At the same time, in order to ensure that FPSO can effectively store crude oil and prevent crude oil leakage from causing waste of resources and environmental pollution, pressure and air-tightness testing can detect tiny defects in the welds and ensure the integrity of the hull, so as to ensure the normal production, storage and unloading.

[0004] Before the pressure and air tightness test, the weld surface needs to be derusted, and then a sealed space is formed on the weld surface through a sealing ring. The test gas (such as air or nitrogen) is filled into the sealed space, and then a high-precision air pressure sensor is used to monitor the pressure changes in the sealed space over a period of time in real time, so as to determine whether there is a leak in the weld that allows the gas inside the sealed space to escape.

[0005] However, the existing FPSO hull weld air tightness inspection device first performs air tightness inspection on each section of the FPSO hull, and then closes the sections of the FPSO hull after the inspection. In order to avoid the leakage point being blocked, the weld surface is not coated. The time required for segmental inspection and then closing the sections is too long, so that the weld after rust removal is exposed to the air for too long, causing the weld to rust again. After rusting, the staff needs to remove rust again, which increases the staff's workload. In the inspection process, the leakage point needs to be manually marked and marked with a marker, which increases the staff's workload. At the same time, during the long inspection process, the staff will become tired, and the tired state is likely to cause errors in the marking, and the errors will cause the leakage point to be unable to be fully welded, resulting in leakage at the leakage point. Based on the above problems, the present application proposes an FPSO hull weld air tightness inspection device and a method for using the same. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a device for testing the air tightness of a FPSO hull weld and a method for using the device, which solves the problems raised in the above-mentioned background technology.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: A device for inspecting the air tightness of an FPSO hull weld comprises a support frame, a rotating assembly is arranged on the rear side of the support frame, a rotating frame is arranged on the support frame through the rotating assembly, a partition is fixedly arranged on the front side of the rotating frame, a fixing frame is fixedly arranged on the left side of the partition, a driving assembly is arranged inside the fixing frame, a hydraulic push rod is arranged on the fixing frame through the driving assembly, a sealing box is fixedly arranged on the extended end of the hydraulic push rod, a groove is opened inside the sealing box, a sealing ring is fixedly arranged inside the groove, an air pressure sensor is fixedly arranged on the surface of the sealing box, a sensing end of the air pressure sensor passes through the sealing box and extends to the inside of the sealing box, an air transmission assembly is arranged on the surface of the partition, a first nozzle and a second nozzle are arranged on the fixing frame through the driving assembly, and an infusion assembly is arranged on the right side of the partition.

[0008] Preferably, the rotating assembly includes a rotating motor fixedly arranged on the rear side of the supporting frame, a driving shaft is fixedly arranged on the output end of the rotating motor, a first pulley is fixedly arranged on the surface of the driving shaft, a driven shaft is rotatably arranged inside the supporting frame, and the driven shaft is fixedly installed on the rear side of the rotating frame, a second pulley is fixedly arranged on the surface of the driven shaft, and a synchronous belt is meshed between the second pulley and the first pulley.

[0009] Preferably, the driving assembly includes a fixed frame fixedly arranged on the left side of the partition, a driving motor is fixedly arranged on the bottom of the fixed frame, a first screw is fixedly arranged on the output end of the driving motor, a transmission assembly is arranged on the surface of the first screw, a first moving block is threadedly arranged on the surface of the first screw, the left side of the first moving block is fixedly connected to the hydraulic push rod, a connecting frame is fixedly arranged on the surface of the fixed frame, a second screw is rotatably arranged inside the connecting frame, a second moving block is threadedly arranged on the surface of the second screw, the second moving block is slidably connected to the connecting frame, the left side of the second moving block is fixedly connected to the first nozzle, the right side of the second moving block is fixedly connected to the second nozzle, and a transmission rod is rotatably arranged inside the rotating frame.

[0010] Preferably, the transmission assembly includes a first sprocket arranged on the surface of the first screw, a first chain is meshed on the surface of the first sprocket, a second sprocket is meshed inside the first chain, the second sprocket is fixedly connected to the second screw, a third sprocket is fixedly arranged on the surface of the second screw, a second chain is meshed inside the third sprocket, a fourth sprocket is meshed inside the second chain, the interior of the fourth sprocket is fixedly connected to a transmission rod, and a diverter assembly is arranged on the surface of the transmission rod.

[0011] Preferably, the diversion assembly includes a worm fixedly arranged on the surface of a transmission rod, a worm wheel is meshingly arranged on the surface of the worm, a support shaft is fixedly arranged inside the worm wheel, an incomplete gear is fixedly arranged on the surface of the support shaft, the support shaft is rotatably connected to a partition, a circular pipe is fixedly arranged on the right side of the partition, a movable pipe is rotatably arranged inside the circular pipe, a movable pipe is fixedly arranged at the liquid inlet end of the movable pipe, a connecting pipe is rotatably arranged at the liquid outlet end of the movable pipe, a first delivery pipe is fixedly arranged at the liquid outlet end of the connecting pipe, the liquid outlet end of the first delivery pipe is fixedly connected to a first nozzle, a second delivery pipe is fixedly arranged at the liquid outlet end of the circular pipe, the liquid outlet end of the second delivery pipe is fixedly connected to a second nozzle, a transmission gear is fixedly arranged on the surface of the movable pipe, the transmission gear is meshingly connected to the incomplete gear, and an infusion assembly is arranged on the surface of the partition.

[0012] Preferably, the infusion assembly includes a liquid storage tank fixedly arranged at the right end of the partition, an infusion pump fixedly arranged on the top of the liquid storage tank, a liquid inlet end of the infusion pump passes through the liquid storage tank and extends to the interior of the liquid storage tank, a third delivery pipe is fixedly arranged at the liquid outlet end of the infusion pump, and the liquid outlet end of the third delivery pipe is fixedly connected to the liquid inlet end of the circular pipe.

[0013] Preferably, the gas delivery assembly comprises an air compressor fixedly arranged on the right side of the partition, a gas pipeline is fixedly arranged at the gas outlet end of the air compressor, and the gas outlet end of the gas pipeline passes through the sealing box and extends to the interior of the sealing box.

[0014] Preferably, there are two hydraulic push rods, and the two hydraulic push rods are symmetrically distributed.

[0015] Preferably, the number of the first nozzles is two, and the two first nozzles are symmetrically distributed.

[0016] A method for using a device for testing the air tightness of a FPSO hull weld comprises the following steps: Step 1: According to the curved surface and vertical surface of the FPSO hull, the rotating frame is driven to rotate by the rotating assembly. The rotation of the rotating frame causes the hydraulic push rod to rotate and tilt. The rotation and tilting of the hydraulic push rod drives the sealing box and the sealing ring to rotate and tilt, so that the sealing ring can be in close contact with the weld. The driving assembly is used to make the hydraulic push rod drive the sealing box and the sealing ring to move on the weld.

[0017] Step 2: When the sealing box moves, the driving assembly drives the second nozzle to move together. At the same time, the driving assembly rotates the transmission rod. The transmission rod rotates through the diversion assembly to allow the fluorescent leak detection agent to enter the second nozzle. The second nozzle moves and sprays the fluorescent leak detection agent onto the weld.

[0018] Step 3: The hydraulic push rod extends and the extended end pushes the sealing box and the sealing ring to the weld, so that the sealing ring and the weld are in close contact, and the detection gas is input into the sealing box through the gas transmission component, so that the air pressure inside the sealing box rises to the pressure required for detection, and then the air pressure sensor is used to detect the air pressure changes inside the sealing box over a period of time.

[0019] Step 4: When the air pressure change in the sealing box does not meet the specified value, the fluorescent leak detector inside the liquid storage tank is transported to the inside of the first nozzle through the diversion component during transportation. The first nozzle sprays the fluorescent leak detector onto one side of the weld, thereby marking that there is a defect in this section of the weld. At the same time, the fluorescent leak detector will form a visible mark at the defect.

[0020] Compared with the prior art, the present invention has the following beneficial effects: 1. The device for testing the air tightness of the weld seam of the FPSO hull drives the sealing box and the sealing ring to move by the driving assembly, and the rotating frame can be tilted by the rotating assembly. The tilting of the rotating frame causes the hydraulic push rod to drive the sealing box and the sealing ring to tilt, and the sealing box and the sealing ring are made to fit the straight and inclined weld seams on the surface of the FPSO hull according to the tilting condition of the weld seam of the FPSO hull. The device performs continuity detection on the weld seams after the sections of the FPSO hull are closed, thereby reducing the time that the weld seams are exposed to the air after rust removal, avoiding the situation where a large amount of rust is generated on the weld seam surface, and reducing the workload of the staff.

[0021] 2. The device for testing the air tightness of the FPSO hull weld, when the sealing box and the sealing ring are moved by the driving component, drives the first nozzle and the second nozzle to move together, and at the same time, the fluorescent leak detection agent is sprayed onto the weld through the second nozzle through the diverter component during the movement of the sealing box. When the air pressure inside the sealing box changes during the air tightness test, the fluorescent leak detection agent is transported to the first nozzle through the diverter component and sprayed onto one side of the weld through the first nozzle. The device can mark a section of the weld with defects, so that subsequent staff can understand which section of the weld has defects. At the same time, the defects on the weld can be imaged to avoid subsequent staff from checking the weld again, reducing the workload, thereby improving the speed of overall inspection of the FPSO hull weld.

[0022] 3. The device for testing the air tightness of the FPSO hull weld, when a defect is found in the tested weld, extends the extended end of the hydraulic push rod to push the sealing box to move, and the sealing box moves to press the sealing ring against the weld. The sealing ring deforms and rebounds to fit the weld. The device can effectively seal the weld and still has a good sealing effect on the inclined weld, thereby improving the practicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a positive isometric drawing of the structure of the present invention; Figure 2 It is a right sectional view of the structure of the present invention; Figure 3 It is a left view of the structure of the present invention; Figure 4 It is a front cross-sectional view of the structure of the present invention; Figure 5 It is a schematic diagram of the local structure of the present invention; Figure 6 It is another partial structural schematic diagram of the present invention; Figure 7 for Figure 1 A magnified view of the structure at A; Figure 8 for Figure 1 A magnified view of the structure at B; Fig. 9 for Figure 3 Enlarged view of the structure at location C.

[0024] In the figure: 1, support frame; 2, rotating motor; 3, first pulley; 4, synchronous belt; 5, driving shaft; 6, driven shaft; 7, second pulley; 8, rotating frame; 9, fixed frame; 10, first screw; 11, first moving block; 12, connecting frame; 13, second screw; 14, second moving block; 15, first sprocket; 16, first chain; 17, second sprocket; 18, transmission rod; 19, fourth sprocket; 20, second chain; 21, third sprocket; 22, first nozzle; 23, second nozzle; 24, first A conveying pipeline; 25. A second conveying pipeline; 26. A circular pipeline; 27. A movable pipeline; 28. A mobile pipeline; 29. ​​A connecting pipeline; 30. A liquid storage tank; 31. An infusion pump; 32. A third conveying pipeline; 33. A transmission gear; 34. An incomplete gear; 35. A supporting shaft; 36. A partition; 37. A worm; 38. A worm wheel; 39. A hydraulic push rod; 40. A sealing box; 41. A groove; 42. An air pressure sensor; 43. A sealing ring; 44. An air compressor; 45. A gas pipeline; 46. A driving motor. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Reference Figure 1-9A device for testing the air tightness of a FPSO hull weld comprises a support frame 1, a rotating assembly is arranged at the rear side of the support frame 1, a rotating frame 8 is arranged at the support frame 1 through the rotating assembly, a partition 36 is fixedly arranged at the front side of the rotating frame 8, a fixed frame 9 is fixedly arranged at the left side of the partition 36, a driving assembly is arranged inside the fixed frame 9, and a hydraulic push rod 39 is arranged at the fixed frame 9 through the driving assembly, the number of the hydraulic push rods 39 is two, and the two hydraulic push rods 39 are symmetrically distributed, the two hydraulic push rods 39 are more stable in the process of moving the sealing box 40, and at the same time, the two ends of the sealing box 40 are subjected to the same force, providing sufficient supporting force to the sealing box 40 and The sealing ring 43 makes the surface of the sealing ring 43 be squeezed and rebounded, so as to avoid the situation that the sealing ring 43 cannot fit the weld locally due to uneven force on the surface of the sealing box 40. The extended end of the hydraulic push rod 39 is fixedly provided with the sealing box 40, and the interior of the sealing box 40 is provided with a groove 41. The interior of the groove 41 is fixedly provided with the sealing ring 43. The surface of the sealing box 40 is fixedly provided with an air pressure sensor 42. The sensing end of the air pressure sensor 42 passes through the sealing box 40 and extends to the interior of the sealing box 40. The surface of the partition 36 is provided with an air delivery component. The fixed frame 9 is provided with a first nozzle 22 and a second nozzle 23 through a driving component. The number of the first nozzle 22 is two, and the two The first nozzles 22 are symmetrically distributed. The two first nozzles 22 allow a distance to be marked, so that the operator can understand which section of the weld has a problem during the airtightness test. An infusion component is provided on the right side of the partition 36. The device rotates the rotating frame 8 through the rotating component according to the inclination of the hull weld. The rotation of the rotating frame 8 causes the hydraulic push rod 39, the sealing box 40 and the sealing ring 43 to tilt and rotate, so that the sealing ring 43 can better fit the weld, and deliver gas to the inside of the sealing box 40. The air pressure sensor 42 is used to detect the air pressure inside the sealing box 40, so as to determine whether there is a leak in the weld. At the same time, the driving component and The diversion component allows the second nozzle 23 to move while spraying fluorescent leak detection agent onto the weld surface, so that the staff can quickly understand the location of the leakage point on the weld surface. The diversion component can deliver the fluorescent leak detection agent to the first nozzle 22 when the sealing box 40 stops moving, so as to identify which section of the weld has a leakage point. The device can perform airtightness inspection on the welds of each section of the FPSO hull after they are closed, and can quickly identify the location of the leakage point on the weld surface. The staff can use ultraviolet lamps to quickly find the leakage point, which improves the speed of airtightness inspection of the FPSO hull weld and avoids the omission of leakage points due to manual identification.

[0027] Specifically, the rotating assembly includes a rotating motor 2 fixedly arranged on the rear side of the support frame 1, a driving shaft 5 is fixedly arranged on the output end of the rotating motor 2, a first pulley 3 is fixedly arranged on the surface of the driving shaft 5, a driven shaft 6 is rotatably arranged inside the support frame 1, and the driven shaft 6 is fixedly installed on the rear side of the rotating frame 8, a second pulley 7 is fixedly arranged on the surface of the driven shaft 6, a synchronous belt 4 is meshed between the second pulley 7 and the first pulley 3, the rotating motor 2 is started, the driving shaft 5 is driven to rotate, the driving shaft 5 rotates to drive the first pulley 3 to rotate, the first pulley 3 rotates to drive the synchronous belt 4 to rotate, the synchronous belt 4 rotates to drive the second pulley 7 to rotate, the second pulley 7 rotates to drive the driven shaft 6 to rotate, the driven shaft 6 rotates to make the rotating frame 8 rotate and tilt, the rotating frame 8 rotates and tilts to make the hydraulic push rod 39 drive the sealing box 40 and the sealing ring 43 to tilt, so that the sealing ring 43 can be replaced to fit the weld on the inclined surface, thereby improving the practicability of the device.

[0028] Specifically, the driving assembly includes a fixing frame 9 fixedly arranged on the left side of the partition 36, a driving motor 46 is fixedly arranged at the bottom of the fixing frame 9, a first screw 10 is fixedly arranged at the output end of the driving motor 46, a transmission assembly is arranged on the surface of the first screw 10, and the transmission assembly includes a first sprocket 15 arranged on the surface of the first screw 10, a first chain 16 is meshed on the surface of the first sprocket 15, a second sprocket 17 is meshed inside the first chain 16, the second sprocket 17 is fixedly connected to the second screw 13, a third sprocket 21 is fixedly arranged on the surface of the second screw 13, a second chain 20 is meshed inside the third sprocket 21, a fourth sprocket 19 is meshed inside the second chain 20, and the inside of the fourth sprocket 19 is fixed to the transmission rod 18 The surface of the transmission rod 18 is provided with a flow dividing component, and the flow dividing component includes a worm 37 fixedly provided on the surface of the transmission rod 18, and a worm wheel 38 is meshedly provided on the surface of the worm 37, and a support shaft 35 is fixedly provided inside the worm wheel 38, and an incomplete gear 34 is fixedly provided on the surface of the support shaft 35, and the support shaft 35 and the partition 36 are rotatably connected, and a circular pipe 26 is fixedly provided on the right side of the partition 36, and a movable pipe 27 is rotatably provided inside the circular pipe 26, and a movable pipe 28 is fixedly provided at the liquid inlet end of the movable pipe 27, and a connecting pipe 29 is rotatably provided at the liquid outlet end of the movable pipe 27, and a first delivery pipe 24 is fixedly provided at the liquid outlet end of the connecting pipe 29, and the liquid outlet end of the first delivery pipe 24 is fixedly connected to the first nozzle 22, and the circular pipe The liquid outlet end of 26 is fixedly provided with a second delivery pipeline 25, and the liquid outlet end of the second delivery pipeline 25 is fixedly connected to the second nozzle 23. A transmission gear 33 is fixedly provided on the surface of the movable pipeline 27, and the transmission gear 33 is meshed and connected with the incomplete gear 34. An infusion assembly is provided on the surface of the partition 36. A first moving block 11 is threadedly provided on the surface of the first screw 10, and the left side of the first moving block 11 is fixedly connected to the hydraulic push rod 39. A connecting frame 12 is fixedly provided on the surface of the fixed frame 9, and a second screw 13 is rotatably provided inside the connecting frame 12. A second moving block 14 is threadedly provided on the surface of the second screw 13, and the second moving block 14 is slidably connected to the connecting frame 12. The left side of the second moving block 14 is fixedly connected to the first nozzle 22. The second moving block 14 The right side of the rotating frame 8 is fixedly connected to the second nozzle 23, and the transmission rod 18 is arranged inside the rotating frame 8. The driving motor 46 is started to rotate the first screw 10, and the first screw 10 rotates to drive the first moving block 11 to move. The movement of the first moving block 11 moves the sealing box 40 and the sealing ring 43, so as to move the sealing box 40 to perform airtight detection on the welds at different ends, so that the continuity of the pressure airtight detection is improved. At the same time, the first screw 10 rotates to drive the first sprocket 15 to rotate, and the first sprocket 15 rotates to drive the second sprocket 17 to rotate through the first chain 16, and the second sprocket 17 rotates to drive the second screw 13 to rotate, and the second screw 13 rotates to drive the second moving block 14 to move, and the second moving block 14 moves to drive the first nozzle 22 and the second nozzle 23 to move.The first nozzle 22, the second nozzle 23 and the sealing box 40 are driven to move by the same driving unit, so that the integration between the functions of the device is improved. The rotation of the second screw 13 will also drive the third sprocket 21 to rotate. The rotation of the third sprocket 21 drives the fourth sprocket 19 to rotate through the second chain 20. The rotation of the fourth sprocket 19 causes the transmission rod 18 to rotate. The rotation of the transmission rod 18 drives the worm wheel 38 to rotate through the worm 37. The rotation of the worm wheel 38 drives the incomplete gear 34 to rotate through the support shaft 35. The rotation of the incomplete gear 34 drives the transmission gear 33 to rotate. The rotation of the transmission gear 33 drives the movable pipe 27 to rotate. The rotation of the movable pipe 27 drives the movable pipe 28 to rotate inside the circular pipe 26, so that when the second nozzle 23 moves, the liquid inlet end of the movable pipe 28 and the liquid inlet end of the circular pipe 26 are separated. Therefore, during the movement of the first nozzle 22, the second nozzle 23 and the sealing box 40, the fluorescent leak detection agent is controlled to flow into the second nozzle 23. When a section of the weld is detected, the fluorescent leak detection agent is controlled to flow into the first nozzle 22, so as to further improve the integration between the functions of the device. ,

[0029] Specifically, the infusion assembly includes a liquid storage tank 30 fixedly arranged at the right end of the partition 36, an infusion pump 31 fixedly arranged on the top of the liquid storage tank 30, a liquid inlet end of the infusion pump 31 passes through the liquid storage tank 30 and extends to the inside of the liquid storage tank 30, a third delivery pipe 32 is fixedly arranged at the liquid outlet end of the infusion pump 31, the liquid outlet end of the third delivery pipe 32 is fixedly connected to the liquid inlet end of the circular pipe 26, the infusion pump 31 is started, and the fluorescent leak detection agent is delivered to the liquid inlet end of the circular pipe 26 through the third delivery pipe 32, and the gas delivery assembly includes an air compressor 44 fixedly arranged on the right side of the partition 36, a gas pipe 45 is fixedly arranged at the gas outlet end of the air compressor 44, and the gas outlet end of the gas pipe 45 passes through the sealing box 40 and extends to the inside of the sealing box 40. Start the air compressor 44 to deliver gas to the inside of the sealing box 40 through the gas pipe 45.

[0030] It should be noted here that when the fluorescent leak detector is applied to the welds and other parts to be inspected, under the action of pressure, if there is a leak, the leak detector will seep out with the leaked gas or liquid, forming a visible trace, and under the help of ultraviolet light, it will emit bright fluorescence, which is very eye-catching, so that staff can easily find tiny leaks.

[0031] When in use: first install the device on a heavy-duty flatbed transport vehicle, move the device to the vicinity of the assembled FPSO hull by the heavy-duty flatbed transport vehicle, start the rotating motor 2 according to the tilted weld of the FPSO ship, drive the driving shaft 5 to rotate, the driving shaft 5 rotates to drive the first pulley 3 to rotate, the first pulley 3 rotates through the synchronous belt 4 to drive the second pulley 7 to rotate, the second pulley 7 rotates to drive the driven shaft 6 to rotate, the driven shaft 6 rotates to rotate the rotating frame 8, the rotating frame 8 rotates through the fixed frame 9 and the first moving block 11 to drive the hydraulic push rod 39 to tilt, the hydraulic push rod 39 drives the sealing box 40 and the sealing ring 43 to tilt, it is necessary to move the sealing box 40 and the sealing ring 43 to the next section of the weld, start the driving motor 46 to rotate the first screw 10, the second The first screw 10 rotates to drive the first moving block 11 to move, and the movement of the first moving block 11 drives the sealing box 40 and the sealing ring 43 to move through the hydraulic push rod 39. At the same time, the first screw 10 rotates to drive the first sprocket 15 to rotate, and the first sprocket 15 rotates through the first chain 16 to drive the second sprocket 17 to rotate, and the second sprocket 17 rotates to drive the second screw 13 to rotate, and the second screw 13 rotates to drive the second moving block 14 to move, and the second moving block 14 moves to drive the first nozzle 22 and the second nozzle 23 to move, and the second screw 13 rotates to drive the third sprocket 21 to rotate, and the third sprocket 21 rotates to drive the fourth sprocket 19 to rotate through the second chain 20, and the fourth sprocket 19 rotates the worm 37 through the transmission rod 18, and the rotation of the worm 37 drives the worm wheel 38 to rotate The worm gear 38 rotates through the support shaft 35 to drive the incomplete gear 34 to rotate, the incomplete gear 34 rotates to drive the transmission gear 33 to rotate, the transmission gear 33 rotates to drive the movable pipe 27 to rotate, the movable pipe 27 rotates to drive the movable pipe 28 to rotate inside the circular pipe 26, so that when the second nozzle 23 moves, the liquid inlet end of the movable pipe 28 and the liquid inlet end of the circular pipe 26 are separated, at this time, the infusion pump 31 is started, the fluorescent leak detection agent inside the liquid storage tank 30 is extracted and enters the second delivery pipe 25 through the third delivery pipe 32 and the circular pipe 26, the second delivery pipe 25 delivers the fluorescent leak detection agent to the second nozzle 23, so that the second nozzle 23 moves while spraying the fluorescent leak detection agent on the weld in the moving direction of the sealing box 40, when the moving After a sealing box 40 reaches the detection distance, the driving motor 46 stops rotating, thereby causing the first screw 10, the second screw 13 and the transmission rod 18 to stop rotating. The transmission rod 18 stops moving and stops the support shaft 35 through the worm gear 38 and the worm 37. The support shaft 35 stops rotating the movable pipe 27 through the incomplete gear 34 and the transmission gear 33. At this time, the liquid inlet end of the movable pipe 28 is completely connected with the liquid inlet end of the annular pipe 26. After the first screw 10 stops rotating, the sealing box 40 and the sealing ring 43 stop moving, and the extended end of the hydraulic push rod 39 is extended to push the sealing box 40 and the sealing ring 43 toward the weld. The sealing ring 43 contacts the weld of the FPSO ship and then continues to move so that the sealing ring 43 deforms and fits the weld.A sealed space is formed inside the sealing box 40, and the air compressor 44 is started to deliver gas to the inside of the sealing box 40 through the gas pipeline 45, so that a high-pressure environment is formed inside the sealing box 40. The air pressure change inside the sealing box 40 within a period of time is detected by the air pressure sensor 42. If the air pressure change meets the specified value, the above operation is repeated to detect the next section of the weld. When the air pressure change in the sealing box 40 does not meet the specified value, the infusion pump 31 is started, and the fluorescent leak detection agent inside the liquid storage tank 30 enters the inside of the mobile pipe 28 through the third delivery pipe 32. The mobile pipe 28 enters the first delivery pipe 24 through the movable pipe 27 and the connecting pipe 29. The first delivery pipe 24 delivers the fluorescent leak detection agent to the inside of the first nozzle 22. The two first nozzles 22 spray the fluorescent leak detection agent to one side of the weld, thereby marking this section of the weld. At the same time, the fluorescent leak detection agent will form a visible mark at the defect.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for testing the air tightness of a FPSO hull weld, comprising a support frame (1), characterized in that: A rotating assembly is arranged at the rear side of the support frame (1), and a rotating frame (8) is arranged on the support frame (1) through the rotating assembly. A partition (36) is fixedly arranged on the front side of the rotating frame (8). A fixed frame (9) is fixedly arranged on the left side of the partition (36). A driving assembly is arranged inside the fixed frame (9). A hydraulic push rod (39) is arranged on the fixed frame (9) through the driving assembly. A sealing box (40) is fixedly arranged at the extended end of the hydraulic push rod (39). A groove (41) is opened inside the sealing box (40), and a sealing ring (43) is fixedly arranged inside the groove (41). An air pressure sensor (42) is fixedly arranged on the surface of the sealing box (40), and a sensing end of the air pressure sensor (42) passes through the sealing box (40) and extends to the inside of the sealing box (40). A gas transmission assembly is arranged on the surface of the partition (36). A first nozzle (22) and a second nozzle (23) are arranged on the fixed frame (9) through the driving assembly. An infusion assembly is arranged on the right side of the partition (36).

2. The device for testing the air tightness of FPSO hull welds according to claim 1, characterized in that: The rotating assembly comprises a rotating motor (2) fixedly arranged on the rear side of a support frame (1), a driving shaft (5) fixedly arranged at the output end of the rotating motor (2), a first pulley (3) fixedly arranged on the surface of the driving shaft (5), a driven shaft (6) rotatably arranged inside the supporting frame (1), and the driven shaft (6) is fixedly mounted on the rear side of a rotating frame (8), a second pulley (7) fixedly arranged on the surface of the driven shaft (6), and a synchronous belt (4) meshingly arranged between the second pulley (7) and the first pulley (3).

3. The device for testing the air tightness of FPSO hull welds according to claim 1, characterized in that: The driving assembly comprises a fixed frame (9) fixedly arranged on the left side of the partition (36); a driving motor (46) is fixedly arranged at the bottom of the fixed frame (9); a first screw rod (10) is fixedly arranged at the output end of the driving motor (46); a transmission assembly is arranged on the surface of the first screw rod (10); a first moving block (11) is threadedly arranged on the surface of the first screw rod (10); the left side of the first moving block (11) is fixedly connected to the hydraulic push rod (39); a connecting frame (12) is fixedly arranged on the surface of the fixed frame (9); a second screw rod (13) is rotatably arranged inside the connecting frame (12); a second moving block (14) is threadedly arranged on the surface of the second screw rod (13); the second moving block (14) is slidably connected to the connecting frame (12); the left side of the second moving block (14) is fixedly connected to the first nozzle (22); the right side of the second moving block (14) is fixedly connected to the second nozzle (23); and a transmission rod (18) is rotatably arranged inside the rotating frame (8).

4. The device for testing the air tightness of FPSO hull welds according to claim 3, characterized in that: The transmission assembly comprises a first sprocket (15) arranged on the surface of a first screw rod (10); a first chain (16) is meshedly arranged on the surface of the first sprocket (15); a second sprocket (17) is meshedly arranged inside the first chain (16); the second sprocket (17) is fixedly connected to the second screw rod (13); a third sprocket (21) is fixedly arranged on the surface of the second screw rod (13); a second chain (20) is meshedly arranged inside the third sprocket (21); a fourth sprocket (19) is meshedly arranged inside the second chain (20); the interior of the fourth sprocket (19) is fixedly connected to a transmission rod (18); and a flow diversion assembly is arranged on the surface of the transmission rod (18).

5. The device for testing the air tightness of FPSO hull welds according to claim 4, characterized in that: The flow dividing assembly comprises a worm (37) fixedly arranged on the surface of a transmission rod (18); a worm wheel (38) is meshingly arranged on the surface of the worm (37); a support shaft (35) is fixedly arranged inside the worm wheel (38); an incomplete gear (34) is fixedly arranged on the surface of the support shaft (35); the support shaft (35) and a partition (36) are rotatably connected; a circular pipe (26) is fixedly arranged on the right side of the partition (36); a movable pipe (27) is rotatably arranged inside the circular pipe (26); a movable pipe (28) is fixedly arranged at the liquid inlet end of the movable pipe (27); and the movable pipe (28) is fixedly arranged on the liquid inlet end of the movable pipe (27). The liquid outlet end of the movable pipe (27) is rotatably provided with a connecting pipe (29), the liquid outlet end of the connecting pipe (29) is fixedly provided with a first delivery pipe (24), the liquid outlet end of the first delivery pipe (24) is fixedly connected to the first nozzle (22), the liquid outlet end of the annular pipe (26) is fixedly provided with a second delivery pipe (25), the liquid outlet end of the second delivery pipe (25) is fixedly connected to the second nozzle (23), a transmission gear (33) is fixedly provided on the surface of the movable pipe (27), the transmission gear (33) is meshingly connected to the incomplete gear (34), and an infusion assembly is provided on the surface of the partition (36).

6. The device for testing the air tightness of FPSO hull welds according to claim 5, characterized in that: The infusion assembly comprises a liquid storage box (30) fixedly arranged at the right end of the partition (36); an infusion pump (31) is fixedly arranged on the top of the liquid storage box (30); a liquid inlet end of the infusion pump (31) passes through the liquid storage box (30) and extends into the interior of the liquid storage box (30); a third delivery pipe (32) is fixedly arranged at the liquid outlet end of the infusion pump (31); and the liquid outlet end of the third delivery pipe (32) is fixedly connected to the liquid inlet end of the circular pipe (26).

7. The device for testing the air tightness of FPSO hull welds according to claim 1, characterized in that: The gas delivery assembly comprises an air compressor (44) fixedly arranged on the right side of the partition (36); a gas pipeline (45) is fixedly arranged at the gas outlet end of the air compressor (44); the gas outlet end of the gas pipeline (45) penetrates the sealing box (40) and extends to the interior of the sealing box (40).

8. The device for testing the air tightness of FPSO hull welds according to claim 1, characterized in that: The number of the hydraulic push rods (39) is two, and the two hydraulic push rods (39) are symmetrically distributed.

9. The device for testing the air tightness of FPSO hull welds according to claim 1, characterized in that: The number of the first nozzles (22) is two, and the two first nozzles (22) are symmetrically distributed.

10. A method for using the device for testing air tightness of FPSO hull welds according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: According to the arc surface and the vertical surface of the FPSO hull, the rotating frame (8) is driven to rotate by the rotating assembly, and the rotating frame (8) causes the hydraulic push rod (39) to rotate and tilt, and the hydraulic push rod (39) rotates and tilts to drive the sealing box (40) and the sealing ring (43) to rotate and tilt, so that the sealing ring (43) can be in close contact with the weld, and the hydraulic push rod (39) drives the sealing box (40) and the sealing ring (43) to move to the next section of the weld through the driving assembly; Step 2: When the sealing box (40) moves, the driving assembly drives the second nozzle (23) to move, and at the same time, the driving assembly causes the transmission rod (18) to rotate. The transmission rod (18) rotates through the diversion assembly to allow the fluorescent leak detection agent to enter the second nozzle (23), and the second nozzle (23) moves while spraying the fluorescent leak detection agent onto the weld; Step 3: The hydraulic push rod (39) extends the extended end to push the sealing box (40) and the sealing ring (43) to move to the weld, so that the sealing ring (43) and the weld are in close contact, and the detection gas is input into the sealing box (40) through the gas transmission component, so that the air pressure inside the sealing box (40) rises to the pressure required for detection, and then the air pressure sensor (42) detects the change of the air pressure inside the sealing box (40) over a period of time; Step 4: When the air pressure change in the sealing box (40) does not meet the specified value, the fluorescent leak detection agent inside the liquid storage tank (30) is transported to the inside of the first nozzle (22) through the diversion component during transportation. The first nozzle (22) sprays the fluorescent leak detection agent onto one side of the weld, thereby marking that there is a defect in this section of the weld. At the same time, the fluorescent leak detection agent will form a visible mark at the defect.

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