Ultrasonic flaw detection device for FPSO ship body welding seam

Abstract

The FPSO ship body weld joint ultrasonic flaw detection device comprises a ship body side plate, a base is arranged on one side of the ship body side plate, a plurality of pneumatic suction cups distributed at equal intervals are fixedly installed on one side of the base, and a first electric sliding rail is fixedly installed at the top of the base; a first sliding seat is slidably connected to the outer portion of the first electric sliding rail, an angle adjusting assembly is arranged on the top of the first sliding seat, a flaw detection assembly is installed on one side of the angle adjusting assembly, and a flaw detection pre-preparation assembly is arranged on one side of the flaw detection assembly. The ultrasonic flaw detection device can perform ultrasonic flaw detection operation on the welding seam at the joint of the ship body side plate, the ultrasonic probe can perform self-adaptive adjustment according to the angle of the welding seam on the ship body side plate, the adaptability is high, a worker does not need to manually adjust the angle position of the ultrasonic probe to the welding seam of the ship body side plate, and the unnecessary workload of the worker is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of weld ultrasonic flaw detection, and in particular to an FPSO ship hull weld ultrasonic flaw detection device. Background Art

[0002] FPSO stands for floating production, storage and offloading. Its hull is the basic load-bearing structure of the entire device. It is a special ship structure that can float on the sea for a long time and has multiple complex functions such as oil production, storage and unloading.

[0003] The hull weld is the key part connecting the various components of the hull. Just like the bone joints of the human body, it is directly related to the strength, watertightness and overall structural integrity of the hull. After the FPSO hull is produced, in order to ensure the structural strength of the hull and determine whether there are penetrating defects in the hull welds, such as pores and cracks, ultrasonic testing is required for the welds on the hull.

[0004] In the process of ultrasonic flaw detection of FPSO hull welds, since most of the hull welds appear at the joints of the side plates, the side plates constitute the side profile of the hull and need to be spliced ​​with multiple plates. The side profile of the hull is arc-shaped, and there is a certain angle between the two side plates. When it is necessary to perform flaw detection on the welds on the hull side plates, the staff needs to manually adjust the angle position of the ultrasonic probe to the welds on the hull side plates for flaw detection. It cannot be adjusted adaptively. After the flaw detection of one side plate is completed, the angle position of the ultrasonic probe needs to be adjusted again before the flaw detection of the next side plate. The operation is relatively cumbersome, which increases the unnecessary workload of the staff and is inconvenient for the staff to use. For this reason, we propose an ultrasonic flaw detection device for FPSO hull welds. Summary of the invention

[0005] In view of the deficiencies of the prior art, the present invention provides an ultrasonic flaw detection device for FPSO hull welds, which solves the problem of ultrasonic flaw detection for hull side plate welds.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A FPSO hull weld ultrasonic flaw detection device comprises a hull side plate, a base is provided on one side of the hull side plate, a plurality of pneumatic suction cups equidistantly distributed are fixedly mounted on one side of the base, a first electric slide rail is fixedly mounted on the top of the base, a first sliding seat is slidably connected to the outside of the first electric slide rail, an angle adjustment component is provided on the top of the first sliding seat, the angle adjustment component is used to adapt to hull side plates of different angles, a flaw detection component is installed on one side of the angle adjustment component, the flaw detection component is used to perform ultrasonic flaw detection on welds on the hull side plate, a pre-flaw detection preparation component is provided on one side of the flaw detection component, the pre-flaw detection preparation component is used to clean and apply coupling agent to the welds on the hull side plate before ultrasonic flaw detection, and a transmission lifting component is provided on one side of the pre-flaw detection preparation component, the transmission lifting component is used to lift the pre-flaw detection preparation component.

[0007] Preferably, the angle adjustment assembly includes a first connecting plate fixedly connected to the top of the first sliding seat, the top of the first connecting plate is fixedly connected to two symmetrically distributed second electric slide rails, the outsides of the two second electric slide rails are slidably connected to the second sliding seat, the tops of the two second sliding seats are fixedly connected to the first support column, the tops of the two first support columns are fixedly connected to the same fixing frame, and the shape of the fixing frame is U-shaped.

[0008] Preferably, both sides of the inner wall of the fixing frame are rotatably connected with rotating shafts, and the same first shell is fixedly connected between the two rotating shafts. The first shell is a hollow structure, and the top and bottom of the first shell are fixedly connected with fixing plates.

[0009] Preferably, a pressure sensor is fixedly installed on one side of the two fixed plates, a telescopic sleeve is fixedly installed on one side of the two pressure sensors, telescopic rods are slidably connected inside the two telescopic sleeves, and a connecting frame is fixedly connected on one side of the two telescopic rods, and the connecting frame is in a sideways U-shape.

[0010] Preferably, one side of the two connecting frames is fixedly connected with a spring, the other end of the spring is arranged on one side of the corresponding pressure sensor, and balls are installed inside the two connecting frames.

[0011] Preferably, the flaw detection assembly includes two symmetrically distributed third electric slide rails fixedly connected to one side of the first shell, the outside of the two third electric slide rails are slidably connected to a third sliding seat, one side of the two third sliding seats is fixedly connected to the same second connecting plate, and an ultrasonic probe is installed on one side of the second connecting plate.

[0012] Preferably, the transmission lifting assembly includes two symmetrically distributed threaded sleeves rotatably connected to one side of the inner wall of the first shell, the interiors of the two threaded sleeves are threadedly connected with threaded rods, and the same third connecting plate is provided on one side of the two threaded rods.

[0013] Preferably, a motor is fixedly mounted on one side of the inner wall of the first shell, a driving gear is fixedly connected to the output end of the motor, and driven gears are fixedly sleeved on the outsides of the two threaded sleeves, and the driving gear is meshingly connected with the two driven gears.

[0014] Preferably, the pre-NDT preparation component includes four correspondingly distributed second support columns fixedly connected to one side of the third connecting plate, one side of the four second support columns is fixedly connected to the same second shell, one side of the third connecting plate is fixedly installed with an exhaust fan, the output end of the exhaust fan is connected to an air duct, the other end of the air duct is connected to the outside of the second shell, a filter plate is fixedly installed on one side of the inner wall of the second shell, the filter plate is located outside the air duct, two symmetrically distributed third support columns are fixedly installed on one side of the inner wall of the second shell, and one side of the two third support columns is fixedly connected to the same brush plate.

[0015] Preferably, a material box is fixedly installed on one side of the third connecting plate, coupling agent is stored inside the material box, the top of the material box is connected to a material pipe, the other end of the material pipe is connected to a nozzle, a flow pump is arranged outside the material pipe, and a coating head is arranged on one side of the third connecting plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This FPSO hull weld ultrasonic flaw detection device can perform ultrasonic flaw detection on the welds at the connection of the hull side panels by setting an angle adjustment component and a flaw detection component. The ultrasonic probe can be adaptively adjusted according to the weld angle on the hull side panel, and has strong adaptability. There is no need for the staff to manually adjust the angle position of the ultrasonic probe to the hull side panel weld, thereby reducing unnecessary workload for the staff.

[0017] 2. This FPSO hull weld ultrasonic flaw detection device can perform flaw detection operations on the welds at the brush plate, nozzle and coating head positions through the transmission lifting assembly and the flaw detection assembly, thereby avoiding the obstruction of the brush plate, nozzle and coating head, which causes the ultrasonic probe to be unable to perform ultrasonic flaw detection on the welds at the brush plate, nozzle and coating head positions, resulting in blind spots and inaccurate flaw detection results.

[0018] 3. This FPSO hull weld ultrasonic flaw detection device can clean the rust, scale, spatter and other impurities on the weld before ultrasonic flaw detection on the weld on the hull side plate by setting up a pre-flaw detection preparation component, and can also apply coupling agent to the weld at the same time. The device can complete the cleaning of weld impurities, application of coupling agent and ultrasonic flaw detection at one time, and the staff does not need to clean the impurities and apply coupling agent to the weld separately before flaw detection on the weld. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural schematic diagram of the hull side plate and the ultrasonic flaw detection device of the present invention; Figure 2 It is a three-dimensional structural schematic diagram of the ultrasonic flaw detection device of the present invention; Figure 3 It is a schematic cross-sectional view of the three-dimensional structure of the ultrasonic flaw detection device of the present invention; Figure 4 It is a partial cross-sectional schematic diagram of the angle adjustment structure of the present invention; Figure 5 It is a schematic cross-sectional view of the structure of the transmission lifting assembly and the pre-flaw detection preparation assembly of the present invention; Figure 6 For the present invention Figure 5 The enlarged structural diagram at A in the middle; Figure 7 It is a schematic cross-sectional view of the structure of the second shell of the present invention.

[0020] In the figure: 1, hull side plate; 2, base; 3, pneumatic suction cup; 4, first electric slide rail; 5, first sliding seat; 6, angle adjustment assembly; 601, first connecting plate; 602, second electric slide rail; 603, second sliding seat; 604, first support column; 605, fixed frame; 606, rotating shaft; 607, first shell; 608, fixed plate; 609, pressure sensor; 610, telescopic sleeve; 611, telescopic rod; 612, spring; 613, connecting frame; 614, ball bearing; 7, flaw detection assembly; 701, third electric slide rail; 702, The third sliding seat; 703, the second connecting plate; 704, the ultrasonic probe; 8, the transmission lifting assembly; 801, the threaded sleeve; 802, the threaded rod; 803, the motor; 804, the driving gear; 805, the driven gear; 806, the third connecting plate; 9, the preparation assembly before flaw detection; 901, the second supporting column; 902, the second shell; 903, the exhaust fan; 904, the air duct; 905, the filter plate; 906, the third supporting column; 907, the brush plate; 908, the material box; 909, the material pipe; 910, the nozzle; 911, the flow pump; 912, the coating head. DETAILED DESCRIPTION

[0021] 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.

[0022] Reference Figure 1-7A FPSO hull weld ultrasonic flaw detection device comprises a hull side plate 1, a base 2 is arranged on one side of the hull side plate 1, a plurality of pneumatic suction cups 3 with equal distances are fixedly installed on one side of the base 2, the base 2 can be fixed on the hull side plate 1 by means of the plurality of pneumatic suction cups 3 with equal distances, a first electric slide rail 4 is fixedly installed on the top of the base 2, a first sliding seat 5 is slidably connected to the outside of the first electric slide rail 4 by the first sliding seat 5 being slidably connected to the outside of the first electric slide rail 4, the angle adjustment component 6, the flaw detection component 7, the transmission lifting component 8 and the flaw detection preparation component 9 can be driven to translate by starting the first electric slide rail 4, an angle adjustment component 6 is arranged on the top of the first sliding seat 5, and the angle adjustment component 6 is used for The angle adjustment assembly 6 is adapted to the hull side plate 1 of different angles, and includes a first connecting plate 601 fixedly connected to the top of the first sliding seat 5, and the top of the first connecting plate 601 is fixedly connected to two symmetrically distributed second electric slide rails 602, and the outer parts of the two second electric slide rails 602 are slidably connected to the second sliding seats 603, and the tops of the two second sliding seats 603 are fixedly connected to the first support column 604, and the tops of the two first support columns 604 are fixedly connected to the same fixing frame 605, and the fixing frame 605 is U-shaped. Since the second sliding seat 603 is slidably connected to the inside of the second electric slide rail 602, the first support column 604, the fixing frame 605, and the first shell 6 can be driven by starting the second electric slide rail 602. 07 and the ball 614 are moved toward the hull side plate 1, and the first shell 607 can be set inside the fixing frame 605 through the U-shaped fixing frame 605. The inner wall of the fixing frame 605 is rotatably connected with the rotating shaft 606 on both sides, and the same first shell 607 is fixedly connected between the two rotating shafts 606. The first shell 607 is a hollow structure, and the top and bottom of the first shell 607 are fixedly connected with a fixing plate 608. The first shell 607 can be inside the fixing frame 605 by setting the two rotating shafts 606. By setting the first shell 607 with a hollow structure, the transmission lifting component 8 can be installed inside the first shell 607. One side of the two fixing plates 608 is fixedly installed with a pressure sensor 609. A telescopic sleeve 610 is fixedly installed on one side of each pressure sensor 609, and a telescopic rod 611 is slidably connected inside the two telescopic sleeves 610. A connecting frame 613 is fixedly connected to one side of the two telescopic rods 611. The connecting frame 613 is in a sideways U-shape. The pressure of the spring 612 can be detected by the set pressure sensor 609. When the pressure values ​​of the two pressure sensors 609 are consistent, the pressure signal is converted into an electrical signal, which is sent to the controller after processing. At this time, the controller can close the second electric slide rail 602, and the second sliding seat 603 and the first shell 607 are fixed at the current angle. The ultrasonic probe 704, the brush plate 907, the nozzle 910 and the coating head 912 are located at the weld position of the hull side plate 1.The telescopic rod 611 slides inside the telescopic sleeve 610, so that the spring 612 will not shake when it contracts. The spring 612 is fixedly connected to one side of the two connecting frames 613, and the other end of the spring 612 is set on one side of the corresponding pressure sensor 609. The two connecting frames 613 are installed with a ball 614 inside. Through the angle adjustment component 6, the ultrasonic probe 704 can be adaptively adjusted according to the angle of the weld on the hull side plate 1, and the adaptability is strong. There is no need for the staff to manually adjust the angle of the ultrasonic probe 704 to the weld on the hull side plate 1, which reduces the unnecessary workload of the staff.

[0023] Specifically, a flaw detection component 7 is installed on one side of the angle adjustment component 6. The flaw detection component 7 is used to perform ultrasonic flaw detection on the weld on the hull side plate 1. The flaw detection component 7 includes two symmetrically distributed third electric slide rails 701 fixedly connected to one side of the first shell 607. The outer sides of the two third electric slide rails 701 are slidably connected to third sliding seats 702. One side of the two third sliding seats 702 is fixedly connected to the same second connecting plate 703. One side of the second connecting plate 703 is installed with an ultrasonic probe 704. By setting the third sliding seat 702 to be slidably connected to the third electric slide rail 70 1, the ultrasonic probe 704 can be driven to move horizontally by starting the third electric slide rail 701, so that the ultrasonic probe 704 can be moved to the weld at the position of the brush plate 907, the nozzle 910 and the coating head 912, so as to avoid the ultrasonic probe 704 being unable to perform ultrasonic flaw detection on the weld at the position of the brush plate 907, the nozzle 910 and the coating head 912 due to the obstruction of the brush plate 907, the nozzle 910 and the coating head 912, which will produce a blind angle and lead to inaccurate flaw detection results. The weld on the hull side plate 1 can be ultrasonically inspected by the set flaw detection component.

[0024] Specifically, a pre-flaw detection preparation component 9 is provided on one side of the flaw detection component 7. The pre-flaw detection preparation component 9 is used to clean and apply coupling agent to the weld on the hull side plate 1 before ultrasonic flaw detection. The pre-flaw detection preparation component 9 includes four correspondingly distributed second support columns 901 fixedly connected to one side of the third connecting plate 806, one side of the four second support columns 901 is fixedly connected to the same second shell 902, and one side of the third connecting plate 806 is fixedly installed with an exhaust fan 903. The output end of the exhaust fan 903 is connected to an air duct 904, and the other end of the air duct 904 is connected to the second shell 902. On the outside, a filter plate 905 is fixedly installed on one side of the inner wall of the second shell 902, and the filter plate 905 is located outside the air duct 904. Two symmetrically distributed third support columns 906 are fixedly installed on one side of the inner wall of the second shell 902, and one side of the two third support columns 906 is fixedly connected with the same brush plate 907. The rust, oxide scale, splash and other impurities on the weld of the hull side plate 1 can be cleaned by the brush plate 907, and the second shell 902 can generate suction by starting the exhaust fan 903, so that the cleaned rust, oxide scale, splash and other impurities are sucked into the second shell 902. Impurities are collected inside the exhaust fan 903 through the filter plate 905, thereby preventing the cleaned impurities such as rust, scale, splashes, etc. from entering the exhaust fan 903 and causing damage to the exhaust fan 903. A material box 908 is fixedly installed on one side of the third connecting plate 806. The coupling agent is stored in the material box 908. The top of the material box 908 is connected to a material pipe 909. The other end of the material pipe 909 is connected to a nozzle 910. A flow pump 911 is arranged outside the material pipe 909. A coating head 912 is arranged on one side of the third connecting plate 806. By starting the flow pump 911, the material box 908 can be filled with coupling agent. The coupling agent stored in 908 is sprayed onto the weld of the hull side plate 1 through the material pipe 909 and the nozzle 910. The spraying amount of the coupling agent can be controlled by the set flow pump 911. The pre-flaw detection preparation component 9 can be used to clean the rust, scale, spatter and other impurities on the weld before ultrasonic flaw detection on the weld on the hull side plate 1. At the same time, the coupling agent can be applied to the weld. The cleaning of impurities in the weld, the application of coupling agent and ultrasonic flaw detection can be completed at one time by the device, and the staff does not need to clean the impurities and apply coupling agent to the weld separately before flaw detection.

[0025] Specifically, a transmission lifting assembly 8 is provided on one side of the flaw detection preparation assembly 9, and the transmission lifting assembly 8 is used for the lifting operation of the flaw detection preparation assembly 9. The transmission lifting assembly 8 includes two symmetrically distributed threaded sleeves 801 rotatably connected to one side of the inner wall of the first shell 607, and the interiors of the two threaded sleeves 801 are both threadedly connected with threaded rods 802, and one side of the two threaded rods 802 is provided with the same third connecting plate 806, and the threaded rod 802 is threadedly connected to the interior of the threaded sleeve 801, so that the third connecting plate 806 can move up and down, and a motor 803 is fixedly installed on one side of the inner wall of the first shell 607, and the output end of the motor 803 is fixedly connected with a driving gear 804, and the exteriors of the two threaded sleeves 801 are both fixedly sleeved with driven gears 805, and the driving The gear 804 is meshedly connected with the two driven gears 805. Through the meshing connection between the driving gear 804 and the two driven gears 805, the two threaded sleeves 801 can be driven to rotate simultaneously by starting the motor 803. Through the transmission lifting assembly 8, the brush plate 907, the nozzle 910 and the coating head 912 can be moved to the inside of the first shell 607, so that the ultrasonic probe 704 can perform flaw detection operations on the welds at the positions of the brush plate 907, the nozzle 910 and the coating head 912, thereby avoiding the obstruction of the brush plate 907, the nozzle 910 and the coating head 912, which causes the ultrasonic probe 704 to be unable to perform ultrasonic flaw detection on the welds at the positions of the brush plate 907, the nozzle 910 and the coating head 912, resulting in blind spots and inaccurate flaw detection results.

[0026] When in use: the base 2 is fixed horizontally on the hull side plate 1 by the pneumatic suction cup 3, the second electric slide rail 602 is started, the second sliding seat 603 drives the ball 614 to contact the two hull side plates 1, and the spring 612 is squeezed. When the pressure values ​​of the two pressure sensors 609 are consistent, the second electric slide rail 602 is closed, and the ultrasonic probe 704, the brush plate 907, the nozzle 910 and the coating head 912 are located at the welding position of the hull side plate 1. By starting the first electric slide rail 4, the angle adjustment component 6, the ultrasonic probe 704, the brush plate 907, the nozzle 910 and the coating head 912 are driven to move. 07 can clean the rust, scale, spatter and other impurities at the weld position, and can evenly apply the coupling agent on the weld of the hull side plate 1. The ultrasonic probe 704 transmits the flaw detection data to the ultrasonic flaw detector, and can complete the ultrasonic flaw detection operation on the weld on the hull side plate 1. Through the above structure, the ultrasonic flaw detection operation can be performed on the weld at the connection of the hull side plate 1. The ultrasonic probe 704 can be adaptively adjusted according to the weld angle on the hull side plate 1, and has strong adaptability. There is no need for the staff to manually adjust the angle position of the ultrasonic probe 704, which reduces unnecessary workload for the staff.

[0027] When it is necessary to perform flaw detection on the welds at the positions of the brush plate 907, the nozzle 910 and the coating head 912, the motor 803 is started to drive the driving gear 804 to rotate. Through the rotation of the driving gear 804, the two threaded sleeves 801 are driven to rotate in the same direction at the same time, and the two threaded rods 802, the third connecting plate 806 and the flaw detection preparation component 9 are driven to move to the inside of the first shell 607, and the third electric slide rail 701 is started to drive the ultrasonic probe 704 to move a second time to the positions of the brush plate 907, the nozzle 910 and the coating head 912. The above structure can be used to perform flaw detection on the welds at the positions of the brush plate 907, the nozzle 910 and the coating head 912, so as to avoid the ultrasonic probe 704 being unable to perform ultrasonic flaw detection on the welds at the positions of the brush plate 907, the nozzle 910 and the coating head 912 due to the obstruction of the brush plate 907, the nozzle 910 and the coating head 912, which will produce blind spots and lead to inaccurate flaw detection results.

[0028] 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", "comprises" or any other variations 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.

[0029] 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. An ultrasonic flaw detection device for FPSO hull welds, comprising a hull side plate (1), characterized in that: A base (2) is provided on one side of the hull side plate (1); a plurality of pneumatic suction cups (3) are fixedly mounted on one side of the base (2) and are distributed at equal distances; a first electric slide rail (4) is fixedly mounted on the top of the base (2); a first sliding seat (5) is slidably connected to the outside of the first electric slide rail (4); an angle adjustment component (6) is provided on the top of the first sliding seat (5); the angle adjustment component (6) is used to adapt to hull side plates (1) of different angles; a flaw detection component (7) is installed on one side of the angle adjustment component (6); the flaw detection component (7) is used to perform ultrasonic flaw detection on welds on the hull side plate (1); a flaw detection preparation component (9) is provided on one side of the flaw detection component (7); the flaw detection preparation component (9) is used to clean and apply coupling agent to welds on the hull side plate (1) before ultrasonic flaw detection; a transmission lifting component (8) is provided on one side of the flaw detection preparation component (9); the transmission lifting component (8) is used to lift the flaw detection preparation component (9) 2. The FPSO hull weld ultrasonic flaw detection device according to claim 1, characterized in that: The angle adjustment assembly (6) comprises a first connecting plate (601) fixedly connected to the top of the first sliding seat (5); two symmetrically distributed second electric slide rails (602) are fixedly connected to the top of the first connecting plate (601); the exteriors of the two second electric slide rails (602) are slidably connected to second sliding seats (603); the tops of the two second sliding seats (603) are fixedly connected to first support columns (604); the tops of the two first support columns (604) are fixedly connected to the same fixing frame (605); and the fixing frame (605) is U-shaped.

3. The FPSO hull weld ultrasonic flaw detection device according to claim 2, characterized in that: Both sides of the inner wall of the fixing frame (605) are rotatably connected to rotating shafts (606), and a first shell (607) is fixedly connected between the two rotating shafts (606). The first shell (607) is a hollow structure, and the top and bottom of the first shell (607) are fixedly connected to fixing plates (608).

4. The FPSO hull weld ultrasonic flaw detection device according to claim 3, characterized in that: A pressure sensor (609) is fixedly mounted on one side of the two fixed plates (608), a telescopic sleeve (610) is fixedly mounted on one side of the two pressure sensors (609), a telescopic rod (611) is slidably connected to the inside of the two telescopic sleeves (610), and a connecting frame (613) is fixedly connected to one side of the two telescopic rods (611), wherein the connecting frame (613) is in a sideways U-shape.

5. The FPSO hull weld ultrasonic flaw detection device according to claim 4, characterized in that: A spring (612) is fixedly connected to one side of each of the two connecting frames (613); the other end of the spring (612) is arranged on one side of a corresponding pressure sensor (609); and a ball bearing (614) is installed inside each of the two connecting frames (613).

6. The FPSO hull weld ultrasonic flaw detection device according to claim 3, characterized in that: The flaw detection assembly (7) comprises two symmetrically distributed third electric slide rails (701) fixedly connected to one side of the first shell (607); the exteriors of the two third electric slide rails (701) are slidably connected to third sliding seats (702); one side of the two third sliding seats (702) is fixedly connected to the same second connecting plate (703); and one side of the second connecting plate (703) is installed with an ultrasonic probe (704).

7. The FPSO hull weld ultrasonic flaw detection device according to claim 3, characterized in that: The transmission lifting assembly (8) comprises two symmetrically distributed threaded sleeves (801) rotatably connected to one side of the inner wall of the first shell (607), the interiors of the two threaded sleeves (801) are both threadedly connected to threaded rods (802), and one side of the two threaded rods (802) is provided with a common third connecting plate (806).

8. The FPSO hull weld ultrasonic flaw detection device according to claim 7, characterized in that: A motor (803) is fixedly mounted on one side of the inner wall of the first housing (607); a driving gear (804) is fixedly connected to the output end of the motor (803); driven gears (805) are fixedly sleeved on the outsides of the two threaded sleeves (801); the driving gear (804) is meshingly connected to the two driven gears (805).

9. The FPSO hull weld ultrasonic flaw detection device according to claim 7, characterized in that: The flaw detection preparation component (9) comprises four correspondingly distributed second support columns (901) fixedly connected to one side of a third connecting plate (806), one side of the four second support columns (901) being fixedly connected to the same second shell (902), one side of the third connecting plate (806) being fixedly mounted with an exhaust fan (903), the output end of the exhaust fan (903) being connected to an air duct (904), the other end of the air duct (904) being connected to the outside of the second shell (902), a filter plate (905) being fixedly mounted on one side of an inner wall of the second shell (902), the filter plate (905) being located outside the air duct (904), and two symmetrically distributed third support columns (906) being fixedly mounted on one side of an inner wall of the second shell (902), and one side of the two third support columns (906) being fixedly connected to the same brush plate (907).

10. The FPSO hull weld ultrasonic flaw detection device according to claim 9, characterized in that: A material box (908) is fixedly mounted on one side of the third connecting plate (806), coupling agent is stored inside the material box (908), a material pipe (909) is connected to the top of the material box (908), a nozzle (910) is connected to the other end of the material pipe (909), a flow pump (911) is arranged outside the material pipe (909), and a coating head (912) is arranged on one side of the third connecting plate (806).

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