A device for inspection of FPSO hull weld tightness and method of use thereof

Abstract

The application discloses a kind of for FPSO hull weld seam air tightness inspection device, including support frame, the rear side of the support frame is provided with rotating assembly, the support frame is provided with rotating frame by rotating assembly, the front side of the rotating frame is fixedly provided with partition, the left side of the partition is fixedly provided with fixed frame, the inside of the fixed frame is provided with drive assembly, the fixed frame is provided with hydraulic push rod by drive assembly, the elongated end of the hydraulic push rod is fixedly provided with sealed box, recess is opened in the inside of the sealed box, the inside of the recess is fixedly provided with sealing ring, the surface of the sealed box is fixedly provided with air pressure sensor, the sensing end of the air pressure sensor is penetrated sealed box and extends to the inside of sealed box, the fixed frame is provided with first nozzle and second nozzle by drive assembly, device can carry out air tightness inspection to the weld of each subsection of FPSO hull after closing, while can quickly identify the position of weld surface leakage point.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of FPSO hull weld detection, and particularly relates to a device for inspecting the air tightness of FPSO hull weld and a use method thereof. BACKGROUND

[0002] FPSO hull refers to the hull of a floating production storage and offloading device. It is the main part of an offshore oil and gas production facility, and the FPSO hull can provide a stable offshore platform for installing oil exploitation and processing equipment. The FPSO hull weld refers to a combined part formed by connecting various steel plates, profiles and other components through a welding process 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, and it is necessary to splice numerous metal components together. Welding is an efficient and reliable connection method, which can make the hull structure form an integral whole and ensure the strength and sealing performance of the hull.

[0003] Pressure air tightness detection is performed on the FPSO hull weld because the FPSO stores a large amount of crude oil and processes flammable and explosive oil and gas at sea. If there is a leakage passage in the weld, oil and gas leakage will occur, which will cause fire and explosion accidents, endanger personnel safety and the marine environment. In order to ensure that the FPSO can effectively store crude oil and prevent resource waste and environmental pollution caused by crude oil leakage, pressure air tightness detection can find small defects in the weld, ensure the integrity of the hull, and ensure the normal operation of production, storage and unloading.

[0004] Before pressure air tightness detection, the surface of the weld needs to be derusted, and then a sealing ring is used to form a sealed space on the surface of the weld. Detection gas (such as air or nitrogen) is filled into the sealed space, and a high-precision air pressure sensor is used to monitor the pressure change in the sealed space for a period of time, so as to determine whether the weld has a leakage port to make the gas in the sealed space escape.

[0005] But the existing FPSO hull weld gas tightness inspection device is first to each section of FPSO hull for air tightness detection, then the FPSO hull of each section after detection is closed, in order to avoid the leakage point being blocked, so the weld surface is not coated, and the time required for the section detection and then closing the section is too long, so that the weld exposed to air for a long time, resulting in the weld being corroded again, and the staff needs to remove the rust again after corrosion, thereby increasing the work amount of the staff, and in the detection process, the staff needs to mark the leakage point by marking pen, which increases the work amount of the staff, and in the long detection process, the staff will be tired, and the tired state is easy to cause the marking error, and the error will cause the leakage point to be unable to be fully welded, resulting in the leakage of the leakage point, based on the above problems, the application provides a device for FPSO hull weld gas tightness inspection and a using method thereof. SUMMARY

[0006] In view of the deficiencies of the prior art, the application provides a device for FPSO hull weld gas tightness inspection and a using method thereof, which solves the problems in the background art.

[0007] In order to achieve the above purpose, the application adopts the following technical scheme:

[0008] A device for FPSO hull weld gas tightness inspection, comprising 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 plate is fixedly arranged on the front side of the rotating frame, a fixed frame is fixedly arranged on the left side of the partition plate, a driving assembly is arranged in the fixed frame, a hydraulic push rod is arranged in the fixed frame through the driving assembly, a sealing box is fixedly arranged on the extension end of the hydraulic push rod, a groove is arranged in the sealing box, a sealing ring is fixedly arranged in the groove, 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, a gas conveying assembly is arranged on the surface of the partition plate, the fixed frame is provided with a first nozzle and a second nozzle through the driving assembly, and a liquid conveying assembly is arranged on the right side of the partition plate.

[0009] Preferably, the rotating assembly comprises a rotary motor fixedly arranged on the rear side of the support frame, a driving shaft is fixedly arranged on the output end of the rotary motor, a first pulley is fixedly arranged on the surface of the driving shaft, a driven shaft is rotatably arranged in the support 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 arranged between the second pulley and the first pulley.

[0010] Preferably, the driving assembly comprises a fixed frame fixedly arranged on the left side of the partition plate, the bottom of the fixed frame is fixedly provided with a driving motor, the output end of the driving motor is fixedly provided with a first screw rod, the surface of the first screw rod is provided with a transmission assembly, the surface of the first screw rod is threadedly provided with a first moving block, the left side of the first moving block is fixedly connected with a hydraulic push rod, the surface of the fixed frame is fixedly provided with a connecting frame, the inner portion of the connecting frame is rotatably provided with a second screw rod, the surface of the second screw rod is threadedly provided with a second moving block, the second moving block is slidably connected with the connecting frame, the left side of the second moving block is fixedly connected with a first nozzle, the right side of the second moving block is fixedly connected with a second nozzle, and the inner portion of the rotating frame is rotatably provided with a transmission rod.

[0011] Preferably, the transmission assembly comprises a first sprocket arranged on the surface of the first screw rod, the surface of the first sprocket is engaged with a first chain, the inner portion of the first chain is engaged with a second sprocket, the second sprocket is fixedly connected with the second screw rod, the surface of the second screw rod is fixedly provided with a third sprocket, the inner portion of the third sprocket is engaged with a second chain, the inner portion of the second chain is engaged with a fourth sprocket, the inner portion of the fourth sprocket is fixedly connected with the transmission rod, and the surface of the transmission rod is provided with a flow splitting assembly.

[0012] Preferably, the flow splitting assembly comprises a worm fixedly arranged on the surface of the transmission rod, the surface of the worm is engaged with a worm wheel, the inner portion of the worm wheel is fixedly provided with a support shaft, the surface of the support shaft is fixedly provided with an incomplete gear, the support shaft is rotatably connected with the partition plate, the right side of the partition plate is fixedly provided with a circular ring pipeline, the inner portion of the circular ring pipeline is rotatably provided with a movable pipeline, the liquid inlet end of the movable pipeline is fixedly provided with a moving pipeline, the liquid outlet end of the movable pipeline is rotatably provided with a connecting pipeline, the liquid outlet end of the connecting pipeline is fixedly provided with a first conveying pipeline, the liquid outlet end of the first conveying pipeline is fixedly connected with the first nozzle, the liquid outlet end of the circular ring pipeline is fixedly provided with a second conveying pipeline, the liquid outlet end of the second conveying pipeline is fixedly connected with the second nozzle, the surface of the movable pipeline is fixedly provided with a transmission gear, the transmission gear is engagedly connected with the incomplete gear, and the surface of the partition plate is provided with an infusion assembly.

[0013] Preferably, the infusion assembly comprises a liquid storage tank fixedly arranged at the right end of the partition plate, the top of the liquid storage tank is fixedly provided with an infusion pump, the liquid inlet end of the infusion pump penetrates through the liquid storage tank and extends into the inner portion of the liquid storage tank, the liquid outlet end of the infusion pump is fixedly provided with a third conveying pipeline, and the liquid outlet end of the third conveying pipeline is fixedly connected with the liquid inlet end of the circular ring pipeline.

[0014] Preferably, the air feeding assembly comprises an air compressor fixedly arranged on the right side of the partition plate, and an air pipe is fixedly arranged at the air outlet end of the air compressor, and the air outlet end of the air pipe penetrates through the sealing box and extends into the interior of the sealing box.

[0015] Preferably, the number of the hydraulic push rods is two, and the two hydraulic push rods are symmetrically distributed.

[0016] Preferably, the number of the first nozzles is two, and the two first nozzles are symmetrically distributed.

[0017] A use method of a device for inspecting the gas tightness of FPSO hull welds, comprising the following steps:

[0018] Step one: according to the arc surface and vertical surface of the FPSO hull, the rotating assembly drives the rotating frame to rotate, the rotating of the rotating frame drives the hydraulic push rod to rotate and tilt, the rotating 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, and the driving assembly drives the hydraulic push rod to move the sealing box and the sealing ring on the weld.

[0019] Step two: when the sealing box moves, the driving assembly drives the second nozzle to move, and at the same time, the driving assembly drives the transmission rod to rotate, the rotating of the transmission rod drives the fluorescent leak detection agent to enter the second nozzle through the flow distribution assembly, and the second nozzle moves while spraying the fluorescent leak detection agent to the weld.

[0020] Step three: the extension of the hydraulic push rod drives the sealing box and the sealing ring to move to the weld, so that the sealing ring is in close contact with the weld, the air feeding assembly inputs the detection gas into the interior of the sealing box, so that the air pressure in the interior of the sealing box rises to the required pressure for detection, and then the air pressure sensor detects the air pressure change in the interior of the sealing box within a period of time.

[0021] Step four: when the air pressure change of the sealing box does not conform to the specified value, the fluorescent leak detection agent in the liquid storage tank is transported into the first nozzle through the flow distribution assembly during transportation, and the first nozzle sprays the fluorescent leak detection agent to one side of the weld, so as to mark the existence of defects in this section of the weld, and at the same time, the fluorescent leak detection agent forms visible traces at the defects.

[0022] Compared with the prior art, the device has the following beneficial effects:

[0023] 1. The device for inspecting the gas tightness of FPSO hull welds, through the driving assembly, the hydraulic push rod drives the sealing box and the sealing ring to move, through the rotating assembly, the rotating frame can be inclined, the inclination of the rotating frame makes the hydraulic push rod drive the sealing box and the sealing ring to incline, according to the inclination of the FPSO hull welds, the sealing box and the sealing ring are attached to the straight line and the inclined welds on the surface of the FPSO hull, the device detects the welds after the closure of each section of the FPSO hull, reduces the time of the welds exposed to the air after rust removal, avoids the situation that a large amount of rust is generated on the surface of the welds, and reduces the work amount of the workers.

[0024] 2. The device for inspecting the gas tightness of FPSO hull welds, when the sealing box and the sealing ring move driven by the driving assembly, the first nozzle and the second nozzle move together, at the same time, through the shunt assembly, the fluorescent leak detection agent is sprayed onto the welds through the second nozzle during the movement of the sealing box, when the air pressure in the sealing box changes during the gas tightness detection, the fluorescent leak detection agent is delivered to the first nozzle through the shunt assembly, and is sprayed to one side of the welds through the first nozzle, the device can identify the defective welds, facilitate the subsequent workers to understand which section of the welds has defects, at the same time, the defects on the welds can be imaged, avoiding the subsequent workers to check the welds again, reducing the work amount, thereby improving the overall detection speed of the FPSO hull welds.

[0025] 3. The device for inspecting the gas tightness of FPSO hull welds, when it is found that the detected welds have defects, the extension end of the hydraulic push rod is extended to push the sealing box to move, the sealing box moves to press the sealing ring against the welds, and the sealing ring is attached to the welds through the deformation and rebound, the device can effectively seal the welds, still has good sealing effect on the inclined welds, and improves the practicability of the device. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a front view of the structure of the present application;

[0027] Figure 2 It is a right view of the structure of the present application;

[0028] Figure 3 It is a left view of the structure of the present application;

[0029] Figure 4 It is a front view of the structure of the present application;

[0030] Figure 5 It is a partial structure schematic view of the present application;

[0031] Figure 6 It is another partial structure schematic view of the present application;

[0032] Figure 7 It isFigure 1 Enlarged view of structure at A of

[0033] Figure 8 Enlarged view of structure at B of Figure 1

[0034] Figure 9 Enlarged view of structure at C of Figure 3

[0035] 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 rod; 11, first moving block; 12, connecting frame; 13, second screw rod; 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 conveying pipeline; 25, second conveying pipeline; 26, circular ring pipeline; 27, movable pipeline; 28, moving pipeline; 29, connecting pipeline; 30, liquid storage tank; 31, infusion pump; 32, third conveying pipeline; 33, transmission gear; 34, incomplete gear; 35, support shaft; 36, partition plate; 37, worm; 38, worm wheel; 39, hydraulic push rod; 40, sealing box; 41, groove; 42, air pressure sensor; 43, sealing ring; 44, air compressor; 45, gas pipeline; 46, driving motor. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0037] With reference to Figures 1-9 ​​The utility model provides a kind of device for the inspection of FPSO hull weld seam air tightness, including support frame 1, the rear side of support frame 1 is provided with rotating assembly, support frame 1 is provided with rotating frame 8 by rotating assembly, the front side of rotating frame 8 is fixedly provided with bulkhead 36, the left side of bulkhead 36 is fixedly provided with fixed frame 9, the inside of fixed frame 9 is provided with drive assembly, fixed frame 9 is provided with hydraulic push rod 39 by drive assembly, the number of hydraulic push rod 39 is two, and two hydraulic push rod 39 is symmetrically distributed, two hydraulic push rod 39 is more stable in the process of moving sealing box 40, simultaneously make the both ends of sealing box 40 stress same, provide enough support force to sealing box 40 and sealing ring 43, so that the surface of sealing ring 43 is extruded rebound, avoid the situation that sealing box 40 surface stress uneven appears local sealing ring 43 cannot adhere to weld seam, the elongated end of hydraulic push rod 39 is fixedly provided with sealing box 40, recess 41 is opened in the inside of sealing box 40, sealing ring 43 is fixedly provided in the inside of recess 41, the surface of sealing box 40 is fixedly provided with air pressure sensor 42, the sensing end of air pressure sensor 42 penetrates sealing box 40 and extends to the inside of sealing box 40, the surface of bulkhead 36 is provided with gas delivery assembly, fixed frame 9 is provided with first nozzle 22 and second nozzle 23 by drive assembly, the number of first nozzle 22 is two, and two first nozzles 22 are symmetrically distributed, two first nozzles 22 can mark a distance, so that operating personnel can understand which section weld seam appears problem when air tightness is detected, so that the right side of bulkhead 36 is provided with liquid delivery assembly, according to the inclination of hull weld seam, the rotating frame 8 is rotated by rotating assembly, the hydraulic push rod 39, sealing box 40 and sealing ring 43 are inclined rotation by rotating frame 8 rotation, so that sealing ring 43 can better adhere to weld seam, gas is transported to the inside of sealing box 40, and the air pressure in the inside of sealing box 40 is detected by air pressure sensor 42, to judge whether there is leakage point in weld seam, simultaneously by drive assembly and shunt assembly, second nozzle 23 is moved while spraying fluorescent leak detection agent to the surface of weld seam, so that operating personnel can quickly understand the position of leakage point on the surface of weld seam, by shunt assembly, fluorescent leak detection agent can be transported to first nozzle 22 when sealing box 40 stops moving, to mark which section weld seam exists leakage point, the device can carry out air tightness inspection to the weld seam after each section of FPSO hull is closed, and the position of leakage point on the surface of weld seam can be quickly identified, operating personnel can quickly find leakage point with the aid of ultraviolet lamp, improve the speed of FPSO hull weld seam air tightness detection, avoid the situation that leakage point is missed in manual identification.

[0038] Specific, rotating assembly includes fixedly arranged in the rear of the support frame 1 rotating motor 2, the output end of the rotating motor 2 is fixedly provided with a driving shaft 5, the surface of the driving shaft 5 is fixedly provided with a first pulley 3, the inside of the support frame 1 is rotatably provided with a driven shaft 6, and the driven shaft 6 is fixedly installed at the rear of the rotating frame 8, the surface of the driven shaft 6 is fixedly provided with a second pulley 7, the first pulley 3 and the second pulley 7 are engaged with a synchronous belt 4, the rotating motor 2 is started, the driving shaft 5 is driven to rotate, the driving shaft 5 drives the first pulley 3 to rotate, the first pulley 3 drives the synchronous belt 4 to rotate, the synchronous belt 4 drives the second pulley 7 to rotate, the second pulley 7 drives 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, and the practicability of the device is improved.

[0039] Specifically, the driving assembly comprises a fixed frame 9 fixedly arranged on the left side of the partition plate 36, the bottom of the fixed frame 9 is fixedly provided with a driving motor 46, the output end of the driving motor 46 is fixedly provided with a first screw rod 10, the surface of the first screw rod 10 is provided with a transmission assembly, the transmission assembly comprises a first sprocket 15 arranged on the surface of the first screw rod 10, the surface of the first sprocket 15 is meshingly provided with a first chain 16, the inside of the first chain 16 is meshingly provided with a second sprocket 17, the second sprocket 17 is fixedly connected with a second screw rod 13, the surface of the second screw rod 13 is fixedly provided with a third sprocket 21, the inside of the third sprocket 21 is meshingly provided with a second chain 20, the inside of the second chain 20 is meshingly provided with a fourth sprocket 19, the inside of the fourth sprocket 19 is fixedly connected with a transmission rod 18, the surface of the transmission rod 18 is provided with a flow splitting assembly, the flow splitting assembly comprises a worm 37 fixedly arranged on the surface of the transmission rod 18, the surface of the worm 37 is meshingly provided with a worm gear 38, the inside of the worm gear 38 is fixedly provided with a supporting shaft 35, the surface of the supporting shaft 35 is fixedly provided with an incomplete gear 34, the supporting shaft 35 is rotatably connected with the partition plate 36, the right side of the partition plate 36 is fixedly provided with a circular annular pipeline 26, the inside of the circular annular pipeline 26 is rotatably provided with a movable pipeline 27, the liquid inlet end of the movable pipeline 27 is fixedly provided with a moving pipeline 28, the liquid outlet end of the movable pipeline 27 is rotatably provided with a connecting pipeline 29, the liquid outlet end of the connecting pipeline 29 is fixedly provided with a first conveying pipeline 24, the liquid outlet end of the first conveying pipeline 24 is fixedly connected with the first nozzle 22, the liquid outlet end of the circular annular pipeline 26 is fixedly provided with a second conveying pipeline 25, the liquid outlet end of the second conveying pipeline 25 is fixedly connected with the second nozzle 23, the surface of the movable pipeline 27 is fixedly provided with a transmission gear 33, the transmission gear 33 is meshingly connected with the incomplete gear 34, the surface of the partition plate 36 is provided with a liquid conveying assembly, the surface of the first screw rod 10 is threadedly provided with a first moving block 11, the left side of the first moving block 11 is fixedly connected with a hydraulic push rod 39, the surface of the fixed frame 9 is fixedly provided with a connecting frame 12, the inside of the connecting frame 12 is rotatably provided with the second screw rod 13, the surface of the second screw rod 13 is threadedly provided with a second moving block 14, the second moving block 14 is slidably connected with the connecting frame 12, the left side of the second moving block 14 is fixedly connected with the first nozzle 22, the right side of the second moving block 14 is fixedly connected with the second nozzle 23, the inside of the rotating frame 8 is rotatably provided with the transmission rod 18, the driving motor 46 is started to drive the first screw rod 10 to rotate, the first screw rod 10 rotates to drive the first moving block 11 to move, the first moving block 11 moves to drive the sealing box 40 and the sealing ring 43 to move, so as to move the sealing box 40 to conduct the air tightness detection on the welds at different ends, thereby improving the continuity of the pressure air tightness detection, at the same time, the first screw rod 10 rotates to drive the first sprocket 15 to rotate, the first sprocket 15 rotates to drive the first chain 16 to drive the second sprocket 17 to rotate, the second sprocket 17 rotates to drive the second screw rod 13 to rotate, the second screw rod 13 rotates to drive the second moving block 14 to move, 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, the integration between the functions of the device is improved, the third sprocket 21 is also driven to rotate by the rotation of the second screw 13, the fourth sprocket 19 is driven to rotate by the rotation of the third sprocket 21 through the second chain 20, the transmission rod 18 is driven to rotate by the rotation of the fourth sprocket 19, the worm wheel 38 is driven to rotate by the rotation of the transmission rod 18 through the rotation of the worm 37, the incomplete gear 34 is driven to rotate by the rotation of the worm wheel 38 through the support shaft 35, the transmission gear 33 is driven to rotate by the rotation of the incomplete gear 34, the movable pipeline 27 is driven to rotate by the rotation of the transmission gear 33, the movable pipeline 28 is driven to rotate in the circular ring pipeline 26 by the rotation of the movable pipeline 27, so that the liquid inlet end of the movable pipeline 28 and the liquid inlet end of the circular ring pipeline 26 are separated when the second nozzle 23 moves, thereby controlling the flow of the fluorescent leak detection agent into the inside of the second nozzle 23 during the movement of the first nozzle 22, the second nozzle 23 and the sealing box 40, and controlling the flow of the fluorescent leak detection agent into the first nozzle 22 during the detection of a weld, further improving the integration between the functions of the device.

[0040] Specifically, the infusion assembly includes a liquid storage tank 30 fixedly arranged at the right end of the partition plate 36, a liquid infusion pump 31 is fixedly arranged at the top of the liquid storage tank 30, the liquid inlet end of the liquid infusion pump 31 penetrates through the liquid storage tank 30 and extends into the inside of the liquid storage tank 30, the liquid outlet end of the liquid infusion pump 31 is fixedly provided with a third conveying pipeline 32, the liquid outlet end of the third conveying pipeline 32 is fixedly connected with the liquid inlet end of the circular ring pipeline 26, the liquid infusion pump 31 is started to convey the fluorescent leak detection agent to the liquid inlet end of the circular ring pipeline 26 through the third conveying pipeline 32, the gas conveying assembly includes an air compressor 44 fixedly arranged at the right side of the partition plate 36, the gas outlet end of the air compressor 44 is fixedly provided with a gas pipeline 45, the gas outlet end of the gas pipeline 45 penetrates through the sealing box 40 and extends into the inside of the sealing box 40. The air compressor 44 is started to convey the gas to the inside of the sealing box 40 through the gas pipeline 45.

[0041] It should be noted that after the fluorescent leak detection agent is applied to the detected weld or the like under the action of pressure, if there is a leakage point, the leak detection agent will seep out with the leaked gas or liquid to form visible traces, and under the irradiation of the ultraviolet lamp, bright fluorescence will be emitted, which is very eye-catching, so that the staff can easily find the tiny leakage point.

[0042] In use: first, the device is installed to the heavy flat transport vehicle, the device is moved to the vicinity of the spliced FPSO hull through the heavy flat transport vehicle, the rotating motor 2 is started according to the weld of the inclined FPSO ship, the driving shaft 5 is driven to rotate, the driving shaft 5 rotation drives the first pulley 3 to rotate, the first pulley 3 rotation drives the second pulley 7 to rotate through the synchronous belt 4, the second pulley 7 rotation drives the driven shaft 6 to rotate, the driven shaft 6 rotation makes the rotating frame 8 rotate, the rotating frame 8 rotation drives the hydraulic push rod 39 to incline through the fixed frame 9 and the first moving block 11, the hydraulic push rod 39 drives the sealing box 40 and the sealing ring 43 to incline, the moving sealing box 40 and the sealing ring 43 need to be moved to the next weld, the driving motor 46 is started, the first screw rod 10 is rotated, the first screw rod 10 rotation drives the first moving block 11 to move, the first moving block 11 moves through the hydraulic push rod 39 to drive the sealing box 40 and the sealing ring 43 to move, at the same time, the first screw rod 10 rotation drives the first sprocket 15 to rotate, the first sprocket 15 rotation drives the second sprocket 17 to rotate through the first chain 16, the second sprocket 17 rotation drives the second screw rod 13 to rotate, the second screw rod 13 rotation drives the second moving block 14 to move, the second moving block 14 movement drives the first nozzle 22 and the second nozzle 23 to move, the second screw rod 13 rotation also drives the third sprocket 21 to rotate, the third sprocket 21 rotation drives the fourth sprocket 19 to rotate through the second chain 20, the fourth sprocket 19 drives the worm 37 to rotate through the transmission rod 18, the worm 37 rotation drives the worm wheel 38 to rotate, the worm wheel 38 rotation drives the incomplete gear 34 to rotate through the support shaft 35, the incomplete gear 34 rotation drives the transmission gear 33 to rotate, the transmission gear 33 rotation drives the movable pipeline 27 to rotate, the movable pipeline 27 rotation drives the moving pipeline 28 to rotate inside the circular ring pipeline 26, so that the liquid inlet end of the moving pipeline 28 and the liquid inlet end of the circular ring pipeline 26 are separated when the second nozzle 23 moves, at this time, the liquid pump 31 is started, the fluorescent leak detection agent in the liquid storage tank 30 is pumped out and enters the second conveying pipeline 25 through the third conveying pipeline 32 and the circular ring pipeline 26, the second conveying pipeline 25 conveys 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 detection distance of one sealing box 40 is moved, the driving motor 46 is stopped to rotate, so that the first screw rod 10, the second screw rod 13 and the transmission rod 18 are all stopped to rotate, the transmission rod 18 is stopped to move through the worm wheel 38 and the worm 37 to stop the support shaft 35 to rotate, the support shaft 35 drives the incomplete gear 34 and the transmission gear 33 to stop the movable pipeline 27 from rotating, at this time, the liquid inlet end of the moving pipeline 28 and the liquid inlet end of the circular ring pipeline 26 are completely connected, the first screw rod 10 is stopped to rotate, so that the sealing box 40 and the sealing ring 43 are stopped to move, the extension end of the extended hydraulic push rod 39 is extended to push the sealing box 40 and the sealing ring 43 to move towards the weld, the sealing ring 43 contacts the weld of the FPSO ship, then continues to move to make the sealing ring 43 deform to fit the weld,The sealing box 40 forms a sealed space, the air compressor 44 is started, the gas is transported to the inside of the sealing box 40 through the gas pipeline 45, the sealing box 40 forms a high-pressure environment, the air pressure sensor 42 detects the air pressure change in the sealing box 40 for a period of time, and the air pressure change meets the specified value. The operation is repeated to detect the next weld, when the air pressure change in the sealing box 40 does not meet the specified value, the infusion pump 31 is started, the fluorescent leak detection agent in the liquid storage tank 30 enters the moving pipeline 28 through the third conveying pipeline 32, the moving pipeline 28 enters the first conveying pipeline 24 through the movable pipeline 27 and the connecting pipeline 29, the first conveying pipeline 24 transports the fluorescent leak detection agent to the inside of the first nozzle 22, and the two first nozzles 22 spray the fluorescent leak detection agent to one side of the weld, thereby marking the weld, and the fluorescent leak detection agent will form visible marks at the defect.

[0043] It should be noted that, in the present document, relational terms such as first and second and the like can be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0044] While embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, combinations, and variations can be made by those skilled in the art without departing from the spirit and scope of the present application, which is defined by the appended claims and their equivalents.

Claims

1. A device for inspection of the gas tightness of FPSO hull welds, comprising a support frame (1), characterised in that, The rear side of the support frame (1) is provided with a rotating assembly, the support frame (1) is provided with a rotating frame (8) through the rotating assembly, the front side of the rotating frame (8) is fixedly provided with a partition plate (36), the left side of the partition plate (36) is fixedly provided with a fixing frame (9), the inside of the fixing frame (9) is provided with a driving assembly, the fixing frame (9) is provided with a hydraulic push rod (39) through the driving assembly, the elongated end of the hydraulic push rod (39) is fixedly provided with a sealing box (40), the inside of the sealing box (40) is provided with a groove (41), the inside of the groove (41) is fixedly provided with a sealing ring (43), the sealing ring (43) is in contact with the detection weld joint, 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) penetrates through the sealing box (40) and extends to the inside of the sealing box (40), the surface of the partition plate (36) is provided with a gas conveying assembly, the fixing frame (9) is provided with a first nozzle (22) and a second nozzle (23) through the driving assembly, the right side of the partition plate (36) is provided with a liquid conveying assembly, the driving assembly comprises the fixing frame (9) fixedly arranged on the left side of the partition plate (36), the bottom of the fixing frame (9) is fixedly provided with a driving motor (46), the output end of the driving motor (46) is fixedly provided with a first screw rod (10), the surface of the first screw rod (10) is provided with a transmission assembly, the surface of the first screw rod (10) is threadedly provided with a first moving block (11), the left side of the first moving block (11) is fixedly connected with the hydraulic push rod (39), the surface of the fixing frame (9) is fixedly provided with a connecting frame (12), the inside of the connecting frame (12) is rotatably provided with a second screw rod (13), the surface of the second screw rod (13) is threadedly provided with a second moving block (14), the second moving block (14) is slidably connected with the connecting frame (12), the left side of the second moving block (14) is fixedly connected with the first nozzle (22), the right side of the second moving block (14) is fixedly connected with the second nozzle (23), the inside of the rotating frame (8) is rotatably provided with a transmission rod (18), the transmission assembly comprises a first sprocket (15) arranged on the surface of the first screw rod (10), the surface of the first sprocket (15) is meshingly provided with a first chain (16), the inside of the first chain (16) is meshingly provided with a second sprocket (17), the second sprocket (17) is fixedly connected with the second screw rod (13), the surface of the second screw rod (13) is fixedly provided with a third sprocket (21), the inside of the third sprocket (21) is meshingly provided with a second chain (20), the inside of the second chain (20) is meshingly provided with a fourth sprocket (19), the inside of the fourth sprocket (19) is fixedly connected with the transmission rod (18), the surface of the transmission rod (18) is provided with a shunt assembly, the shunt assembly comprises a worm (37) fixedly arranged on the surface of the transmission rod (18), the surface of the worm (37) is meshingly provided with a worm wheel (38),The inside of the worm wheel (38) is fixedly provided with a supporting shaft (35), the surface of the supporting shaft (35) is fixedly provided with an incomplete gear (34), the supporting shaft (35) is rotationally connected with a partition plate (36), the right side of the partition plate (36) is fixedly provided with a circular annular pipeline (26), the inside of the circular annular pipeline (26) is rotationally provided with a movable pipeline (27), the liquid inlet end of the movable pipeline (27) is fixedly provided with a moving pipeline (28), the liquid outlet end of the movable pipeline (27) is rotationally provided with a connecting pipeline (29), the liquid outlet end of the connecting pipeline (29) is fixedly provided with a first conveying pipeline (24), the liquid outlet end of the first conveying pipeline (24) is fixedly connected with a first nozzle (22), the liquid outlet end of the circular annular pipeline (26) is fixedly provided with a second conveying pipeline (25), the liquid outlet end of the second conveying pipeline (25) is fixedly connected with a second nozzle (23), the surface of the movable pipeline (27) is fixedly provided with a transmission gear (33), the transmission gear (33) is meshingly connected with the incomplete gear (34), the surface of the partition plate (36) is provided with a transfusion assembly, the transfusion assembly comprises a liquid storage tank (30) fixedly arranged at the right end of the partition plate (36), the inside of the liquid storage tank (30) is provided with a fluorescent leak detection agent, the top of the liquid storage tank (30) is fixedly provided with a transfusion pump (31), the liquid inlet end of the transfusion pump (31) penetrates through the liquid storage tank (30) and extends to the inside of the liquid storage tank (30), the liquid outlet end of the transfusion pump (31) is fixedly provided with a third conveying pipeline (32), and the liquid outlet end of the third conveying pipeline (32) is fixedly connected with the liquid inlet end of the circular annular pipeline (26).

2. The device for inspecting the gas tightness of FPSO hull welds according to claim 1, characterized in that, The rotating assembly comprises a rotating motor (2) fixedly arranged at the rear side of the support frame (1), an output end of the rotating motor (2) is fixedly provided with a driving shaft (5), the surface of the driving shaft (5) is fixedly provided with a first belt pulley (3), the inside of the support frame (1) is rotatably provided with a driven shaft (6), the driven shaft (6) is fixedly installed at the rear side of a rotating frame (8), the surface of the driven shaft (6) is fixedly provided with a second belt pulley (7), and the second belt pulley (7) and the first belt pulley (3) are engaged with a synchronous belt (4).

3. The device for inspecting the gas tightness of FPSO hull welds according to claim 1, characterized in that, The gas conveying assembly comprises an air compressor (44) fixedly arranged at the right side of the partition plate (36), and the air outlet end of the air compressor (44) is fixedly provided with a gas pipeline (45) penetrating through the sealing box (40) and extending into the inside of the sealing box (40).

4. The device for inspecting the gas 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.

5. The device for inspection of FPSO hull weld tightness 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.

6. A method of using a device for inspecting the gas tightness of FPSO hull welds according to any one of claims 1 to 5, characterized in that, The method comprises the following steps: Step one: according to the arc surface and the vertical surface of the FPSO ship body, the rotating frame (8) is driven to rotate by the rotating assembly, the rotating frame (8) is driven to rotate to drive the hydraulic push rod (39) to rotate and tilt, the hydraulic push rod (39) is driven to rotate and tilt 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 sealing box (40) and the sealing ring (43) are driven to move to the next weld by the hydraulic push rod (39) through the driving assembly; Step two: the sealing box (40) is driven to move by the driving assembly, and the second nozzle (23) is driven to move by the driving assembly at the same time, and the driving assembly drives the transmission rod (18) to rotate, the transmission rod (18) is driven to rotate to drive the fluorescent leak detection agent to enter the inside of the second nozzle (23) through the flow distribution assembly, and the fluorescent leak detection agent is sprayed to the weld through the second nozzle (23) while moving; Step three: the sealing box (40) and the sealing ring (43) are driven to move to the weld by the extension of the hydraulic push rod (39), so that the sealing ring (43) is in close contact with the weld, the detection gas is input into the inside of the sealing box (40) through the gas conveying assembly, the gas pressure in the inside of the sealing box (40) is increased to the required pressure, and then the change of the gas pressure in the inside of the sealing box (40) in a period of time is detected by the gas pressure sensor (42); Step four: when the change of the gas pressure in the sealing box (40) does not conform to the specified value, the fluorescent leak detection agent in the liquid storage tank (30) is transported into the inside of the first nozzle (22) through the flow distribution assembly during transportation, and the first nozzle (22) sprays the fluorescent leak detection agent to one side of the weld, so as to mark that the weld has defects, and the fluorescent leak detection agent can form visible traces at the defects.

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