Nondestructive ultrasonic flaw detection equipment for seamless steel pipe and flaw detection method

Abstract

The invention belongs to the technical field of steel pipe flaw detection, and particularly relates to nondestructive ultrasonic flaw detection equipment for seamless steel pipes. The present invention comprises: a water tank; the rotating mechanism is used for driving the seamless steel pipe to rotate; the flaw detection mechanism is used for flaw detection of seamless steel tube surfaces; the transverse transfer mechanism is connected with a movable flaw detection trolley; the flaw detection mechanism comprises a lifting frame, a first lifting cylinder for driving the lifting frame to lift, a plurality of probe assemblies mounted on the lifting frame and a second lifting cylinder for driving the probe assemblies to lift; the probe assembly comprises a lifting seat, a probe seat mounted at the lower end of the lifting seat and an ultrasonic probe mounted on the probe seat; a groove is formed in the lower surface of the probe seat, and a coupling assembly is mounted in the groove; the water storage area is formed between the water storage frame and the seamless steel pipe, a stable water film layer can be formed when water flow in the water storage area flows through the surface of the seamless steel pipe, the probability of missed detection is reduced, and the detection result is more accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of steel pipe flaw detection, and particularly to a non-destructive ultrasonic flaw detection device and method for seamless steel pipes. Background Art

[0002] During the production process of steel pipes, due to various factors, defects such as longitudinal cracks, transverse cracks, folds, and delaminations often exist on the steel pipe wall. If the steel pipe has defects, it will rupture during use, causing accidents and even serious consequences, which may result in significant economic losses and even casualties. Therefore, steel pipes for important uses require perfect non-destructive testing equipment to perform online flaw detection on the steel pipes. The main flaw detection methods are ultrasonic flaw detection and eddy current flaw detection methods.

[0003] For online ultrasonic flaw detection of steel pipes, generally, the method of probe water film coupling is used for online flaw detection. The probe is pressed against the outer surface of the steel pipe at a certain distance by a certain mechanical mechanism. During the flaw detection process, the nozzle continuously sprays water, forming a coupling water film on the steel pipe surface, and relying on ultrasonic emission for flaw detection. However, the method of forming a water film by spraying water through the nozzle has the following problems: and during the water spraying process, due to factors such as the high-speed impact of the water flow, fluctuations in the water spraying volume and water spraying pressure, the local water film will rupture, resulting in missed detection. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a non-destructive ultrasonic flaw detection device and method for seamless steel pipes, which form a stable water film layer on the surface of the seamless steel pipe by providing a coupling system, aiming to solve the problems in the background art.

[0005] To achieve the above technical purpose, the specific technical solution of the present invention is as follows. A non-destructive ultrasonic flaw detection device for seamless steel pipes proposed by the present invention includes: a water tank; a rotating mechanism for driving the seamless steel pipe to rotate; a flaw detection mechanism for performing ultrasonic flaw detection on the surface of the seamless steel pipe; a transverse transfer mechanism, on which a movable flaw detection trolley is connected, and the flaw detection mechanism is installed on the flaw detection trolley; the flaw detection mechanism includes a lifting frame, a first lifting cylinder for driving the lifting frame to lift, a plurality of probe assemblies installed on the lifting frame, and a second lifting cylinder for driving the probe assemblies to lift; the probe assembly includes a lifting seat, a probe seat installed at the lower end of the lifting seat, and an ultrasonic probe installed on the probe seat; a groove is provided on the lower surface of the probe seat, and a coupling component is installed in the groove for providing a stable coupling agent during flaw detection.

[0006] As a preferred technical solution of the present invention, the coupling component includes a U-shaped water storage frame, a water storage area is formed between the water storage frame and the seamless steel pipe, and a stable water film layer is formed when the coupling agent in the water storage area flows through the surface of the seamless steel pipe; and a water outlet nozzle is installed on the water storage frame, and a water pipe is connected to the water outlet nozzle.

[0007] As a preferred technical solution of the present invention, drain holes are provided on the side of the water storage rack, a laser level sensor is installed on the water storage rack, and an electromagnetic flow valve is installed on the water pipe.

[0008] As a preferred technical solution of the present invention, the water storage rack includes a back plate and a pair of arc-shaped side plates connected to both ends of the back plate; and a sealing strip is fixedly installed at the bottom of the water storage rack.

[0009] As a preferred technical solution of the present invention, a fine-thread screw is fixedly connected to the water storage rack, and the fine-thread screw is fixedly connected to the probe holder through a locking nut; and vertical sliding grooves are provided on the inner wall of the groove, and sliding strips slidably connected to the sliding grooves are provided on the surface of the water storage rack.

[0010] As a preferred technical solution of the present invention, the horizontal transfer mechanism includes a track plate, a servo motor, and a ball screw; a screw seat threadedly connected to the ball screw is installed on the flaw detection trolley, the flaw detection trolley is slidably connected to the track plate, and an electric control box is installed on the flaw detection trolley.

[0011] As a preferred technical solution of the present invention, the rotating mechanism includes a frame, a pair of rotating shafts rotatably connected to the frame, and supporting wheels installed on the rotating shafts; a driving motor is installed on the frame, and the driving motor is connected to the rotating shaft.

[0012] As a preferred technical solution of the present invention, a plurality of rollers capable of contacting the seamless steel pipe are installed at the bottom of the probe holder.

[0013] As a preferred technical solution of the present invention, a bracket is fixedly connected to the lifting frame, and a camera is installed on the bracket.

[0014] A flaw detection method for seamless steel pipes includes the following steps: Step 1: Place the seamless steel pipe on the rotating mechanism, and the rotating mechanism drives the seamless steel pipe to rotate slowly. Step 2: Move the flaw detection trolley to one end of the horizontal transfer mechanism, the first lifting cylinder drives the lifting frame to a specified height, and then the second lifting cylinder drives the probe assembly to descend, and the probe holder contacts the surface of the seamless steel pipe. Step 3: While the probe assembly descends, it drives the water storage rack to descend until it contacts the surface of the seamless steel pipe, and then the coupling agent flows out from the water outlet nozzle and is stored in the water storage area. The coupling agent in the water storage area flows over the surface of the seamless steel pipe to form a stable water film layer. Step 4: The horizontal transfer mechanism drives the flaw detection trolley to move slowly horizontally. During the movement, the ultrasonic probe performs flaw detection on the surface of the seamless steel pipe.

[0015] The beneficial effects in the present invention are: 1. The present invention is provided with a water storage rack, and a water storage area is formed between the water storage rack and the seamless steel pipe. When the water in the water storage area flows over the surface of the seamless steel pipe, a stable water film layer can be formed. Compared with the prior art method of forming a water film by spraying water through a nozzle, the present invention reduces the probability of local rupture of the water film, reduces the probability of missed detection, and the detection result is more accurate.

[0016] 2. The present invention installs a laser level sensor on the water storage rack and an electromagnetic flow valve on the water pipe, which can ensure that the water level height in the water storage area is within a certain range, and the water storage rack is provided with drain holes, thereby ensuring that the water film thickness is within the specified range and avoiding the water film being too thick or too thin. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a non-destructive ultrasonic flaw detection device for seamless steel pipes proposed by the present invention.

[0018] Figure 2 It is a front view schematic diagram of a non-destructive ultrasonic flaw detection device for seamless steel pipes proposed by the present invention.

[0019] Figure 3 It is a schematic structural diagram of the rotating mechanism proposed by the present invention.

[0020] Figure 4 It is a schematic diagram of the lateral transfer mechanism and the flaw detection mechanism proposed by the present invention.

[0021] Figure 5 It is Figure 4 Another perspective schematic diagram.

[0022] Figure 6 It is a schematic diagram of the probe assembly and the coupling assembly proposed by the present invention.

[0023] Figure 7 It is Figure 6 Another perspective schematic diagram.

[0024] Figure 8 It is a schematic structural diagram of the coupling assembly proposed by the present invention.

[0025] Figure 9 It is Figure 8 Another perspective schematic diagram.

[0026] Figure 10 It is a schematic diagram of the cooperation between the coupling assembly of the present invention and the seamless steel pipe.

[0027] The corresponding names of the reference numerals in the drawings are as follows: 100, rotating mechanism; 101, frame; 102, rotating shaft; 103, supporting wheel; 104, driving motor; 200. Transverse transfer mechanism; 201. Flaw detection trolley; 202. Track slab; 203. Servo motor; 204. Electric control box; 205. Ball screw; 206. Screw seat; 300. Flaw detection mechanism; 301. Lifting frame; 302. First lifting cylinder; 303. Second lifting cylinder; 304. Bracket; 305. Camera; 400. Probe assembly; 401. Lifting seat; 402. Probe seat; 403. Roller; 404. Groove; 405. Slide groove; 406. Ultrasonic probe; 500. Coupling assembly; 501. Water storage frame; 502. Water storage area; 503. Sealing strip; 504. Water pipe; 505. Electromagnetic flow valve; 506. Laser level sensor; 507. Drain hole; 508. Water outlet nozzle; 509. Fine thread screw; 510. Locking nut; 511. Slide bar; 600. Water tank; 700. Seamless steel pipe. Specific embodiments

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0029] Embodiment: This embodiment discloses a non-destructive ultrasonic flaw detection device for seamless steel pipes, which is applicable to the detection of large-diameter steel pipes with a diameter of 0.3 - 0.7 m. As Figures 1 - 10 shown, it includes: a rotating mechanism 100 for driving the seamless steel pipe 700 to rotate, and the seamless steel pipe 700 is placed on the rotating mechanism 100; a water tank 600 is arranged below the seamless steel pipe 700; a flaw detection mechanism 300 for performing ultrasonic flaw detection on the surface of the seamless steel pipe 700; a transverse transfer mechanism 200, and a movable flaw detection trolley 201 is connected to the transverse transfer mechanism 200, and the flaw detection mechanism 300 is installed on the flaw detection trolley 201; the flaw detection mechanism 300 includes a lifting frame 301, a first lifting cylinder 302 for driving the lifting frame 301 to lift, a plurality of probe assemblies 400 installed on the lifting frame 301, and a second lifting cylinder 303 for driving the probe assemblies 400 to lift. Vertical guide rails slidably connected to the lifting frame 301 are provided on the flaw detection trolley 201, and vertical guide rails slidably connected to the probe assemblies 400 one by one are installed on the lifting frame 301; in this embodiment, the number of probe assemblies 400 is four, and the probe assemblies 400 are arranged directly above the seamless steel pipe 700; the rotating mechanism 100 drives the seamless steel pipe 700 to rotate slowly, and the transverse transfer mechanism 200 drives the flaw detection mechanism 300 to move horizontally and slowly to perform spiral and comprehensive flaw detection on the surface of the seamless steel pipe 700, and the four probe assemblies 400 just completely cover the seamless steel pipe 700.

[0030] As Figure 3 shown in the figure, the rotating mechanism 100 includes a frame 101, a pair of rotating shafts 102 rotatably connected to the frame 101, and support wheels 103 mounted on the rotating shafts 102. The seamless steel pipe 700 is placed between the two rotating shafts 102 and is in contact with the surface of the support wheels 103; a bearing seat rotatably connected to the rotating shaft 102 is mounted on the frame 101; a driving motor 104 is mounted on the frame 101, and the driving motor 104 is connected to the rotating shaft 102; by driving the rotation of one of the rotating shafts 102 by the driving motor 104, when the rotating shaft 102 rotates, the seamless steel pipe 700 is driven to rotate by the support wheels 103, and at the same time, the other rotating shaft 102 also rotates synchronously.

[0031] As Figures 4 - 5 shown in the figure, the transverse transfer mechanism 200 includes a track plate 202, a servo motor 203, and a ball screw 205. A transverse track is provided on the surface of the track plate 202, and the track plate 202 is fixedly installed on the frame 101 through support columns; a screw seat 206 threadedly connected to the ball screw 205 is mounted on the flaw detection trolley 201, the flaw detection trolley 201 is slidably connected to the track plate 202, and an electric control box 204 is mounted on the flaw detection trolley 201; by driving the rotation of the ball screw 205 by the servo motor 203, the flaw detection trolley 201 is driven to move horizontally, and the flaw detection mechanism 300 performs flaw detection on the surface of the seamless steel pipe 700.

[0032] Preferably, a bracket 304 is fixedly connected to the lifting frame 301, a camera 305 is mounted on the bracket 304, and the camera 305 faces the probe assembly 400 to record the flaw detection process by video.

[0033] As Figures 6 - 7 shown in the figure, the probe assembly 400 includes a lifting seat 401, a probe seat 402 mounted at the lower end of the lifting seat 401, and ultrasonic probes 406 mounted on the probe seat 402. The ultrasonic probes 406 are directed towards the center of the seamless steel pipe 700 and are arranged directly above the seamless steel pipe 700. The lifting seat 401 is fixedly connected to the piston rod of the second lifting cylinder 303; a groove 404 is provided on the lower surface of the probe seat 402, the ultrasonic probes 406 are mounted in the middle of the groove 404, and a coupling assembly 500 is mounted in the groove 404 to provide a stable coupling agent during the flaw detection process; 99% of the components of the coupling agent are water.

[0034] Preferably, a plurality of rollers 403 capable of contacting the seamless steel pipe 700 are mounted at the bottom of the probe seat 402, and the seamless steel pipe 700 drives the rollers 403 to rotate when it rotates.

[0035] As Figures 8 - 10As shown in the figure, the coupling component 500 includes a U-shaped water storage rack 501. The water storage rack 501 includes a back plate and a pair of arc-shaped side plates connected to both ends of the back plate. The radian of the side plates is the same as that of the seamless steel pipe 700. A water storage area 502 is formed between the back plate, the side plates on the water storage rack 501 and the seamless steel pipe 700. The water storage area 502 is approximately triangular in shape, and a water outlet nozzle 508 is installed on the water storage rack 501. The water outlet speed of the water outlet nozzle 508 is relatively gentle and slow to avoid the water wave shaking in the water storage area 502. A water pipe 504 is connected to the water outlet nozzle 508, and the water pipe 504 is connected to an external water pump. The water discharged through the water outlet nozzle 508 is stored in the water storage area 502. When the water in the water storage area 502 reaches a certain height, a stable water film layer is formed when the water flows over the upper surface of the seamless steel pipe 700. Among them, the thickness of the water film layer is controlled between 0.1 - 0.2 mm to avoid being too thick or too thin. If the water film layer is too thick, the true defect signal will be masked due to the interference of the standing wave of the water layer. If the water film layer is too thin, local coupling failure will occur and undetected defects will be generated. In this embodiment, a water storage area 502 is formed between the water storage rack 501 and the seamless steel pipe 700, and the water in the water storage area 502 continuously flows over the surface of the seamless steel pipe to form a stable water film layer. Compared with the method of forming a water film layer by spraying water in the prior art, in this embodiment, even if there is an instantaneous waveguide in the water outlet size of the water outlet nozzle 508, the influence on the water level height in the water storage area 502 is small, and the water film layer can be stably formed, reducing the probability of undetected defects.

[0036] Preferably, a sealing strip 503 is fixedly installed at the bottom of the water storage rack 501. Among them, the sealing strip 503 is installed at the bottom of both the back plate and the side plates. The sealing strip 503 can be installed at the bottom of the water storage rack 501 by pasting. Through the design of the sealing strip 503, the sealing performance between the water storage rack 501 and the seamless steel pipe 700 is improved. However, due to the relative sliding between the water storage rack 501 and the seamless steel pipe 700 during the detection process, it is impossible to achieve complete sealing, and a very small amount of water will flow out from the gap between the water storage rack 501 and the seamless steel pipe 700, but it does not affect the detection. During the detection process, as long as the liquid level height in the water storage area 502 is controlled within the specified height range, it will not affect the formation of the water film layer.

[0037] Preferably, to control the upper limit of the liquid level in the water storage area 502 and avoid an overly thick water film, a drain hole 507 is provided on the side of the water storage rack 501. The height of the drain hole 507 is 0.15 - 0.2 mm higher than the upper surface of the seamless steel pipe 700. When the liquid level in the water storage area 502 is too high, water will automatically flow out from the drain hole 507. Moreover, a high-precision laser liquid level sensor 506 is installed on the water storage rack 501 to monitor the liquid level height in the water storage area 502. The precision of the laser liquid level sensor 506 is 0.1 mm. An electromagnetic flow valve 505 is installed on the water pipe 504. The electromagnetic flow valve 505 uses a micro electromagnetic proportional valve, which has the characteristics of small volume, small flow rate, and high control precision. Both the laser liquid level sensor 506 and the electromagnetic flow valve 505 are controlled by the electric control box 204, and the electric control box 204 uses a plc control system. When the liquid level in the water storage area 502 is too low, the opening degree of the electromagnetic flow valve 505 automatically increases to raise the liquid level height in the water storage area 502. To avoid frequent startup of the electromagnetic flow valve 505, during the detection process, the water inlet speed in the water storage area 502 is slightly greater than the water outlet speed, so that the liquid level height in the water storage area 502 remains flush with the height of the drain hole 507, ensuring the stability of the water film thickness. In this embodiment, through the settings of the laser liquid level sensor 506 and the electromagnetic flow valve 505, it is ensured that the liquid level height in the water storage area 502 is within the specified range, and thus the thickness of the water film layer is between 0.1 - 0.2 mm.

[0038] Preferably, a fine-thread screw rod 509 is fixedly connected to the water storage rack 501. The fine-thread screw rod 509 is fixedly connected to the probe holder 402 through a locking nut 510. Moreover, a vertical sliding groove 405 is provided on the inner wall of the groove 404, and a sliding strip 511 slidably connected to the sliding groove 405 is provided on the surface of the water storage rack 501. Through the cooperation of the fine-thread screw rod 509 and the locking nut 510, the height of the water storage rack 501 can be finely adjusted, and the adjustment range is between 0.1 - 0.2 mm.

[0039] This embodiment also discloses a flaw detection method for seamless steel pipes. Based on the above flaw detection equipment, it includes the following steps: Step 1: Place the seamless steel pipe 700 on the rotating mechanism 100, and the rotating mechanism 100 drives the seamless steel pipe 700 to slowly rotate, where the rotation speed of the seamless steel pipe 700 is controlled at 8 - 10 rpm. Step 2: Move the flaw detection trolley 201 to one end of the transverse transfer mechanism 200. The first lifting cylinder 302 drives the lifting frame 301 to the specified height, and then each second lifting cylinder 303 drives the probe assembly 400 to descend respectively. The roller 403 at the bottom of the probe holder 402 contacts the surface of the seamless steel pipe 700, and at this time, the ultrasonic probe 406 is facing the seamless steel pipe 700. Step 3: While the probe assembly 400 descends, it drives the water storage rack 501 to descend until it contacts the surface of the seamless steel pipe 700. Then, the coupling agent flows out from the water outlet nozzle 508 and is stored in the water storage area 502. The coupling agent in the water storage area 502 flows over the surface of the seamless steel pipe 700 to form a stable water film layer, and the water film layer is directly below the ultrasonic probe 406. Step 4: The horizontal transfer mechanism 200 drives the flaw detection trolley 201 to slowly move horizontally. During the movement, the ultrasonic probe 406 performs flaw detection on the surface of the seamless steel pipe 700, and the detection signal is sent to the electric control box 204 and displayed by the terminal computer.

[0040] Finally, it should be noted that: In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0041] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A non-destructive ultrasonic flaw detection device for seamless steel pipes, characterized in that, Comprising: A water tank (600); A rotating mechanism (100) for driving a seamless steel pipe (700) to rotate; A flaw detection mechanism (300) for performing ultrasonic flaw detection on the surface of the seamless steel pipe (700); A transverse transfer mechanism (200), a movable flaw detection trolley (201) is connected to the transverse transfer mechanism (200), and the flaw detection mechanism (300) is installed on the flaw detection trolley (201); The flaw detection mechanism (300) includes a lifting frame (301), a first lifting cylinder (302) for driving the lifting frame (301) to lift, a plurality of probe assemblies (400) installed on the lifting frame (301), and a second lifting cylinder (303) for driving the probe assemblies (400) to lift; The probe assembly (400) includes a lifting seat (401), a probe seat (402) installed at the lower end of the lifting seat (401), and an ultrasonic probe (406) installed on the probe seat (402); A groove (404) is provided on the lower surface of the probe seat (402), and a coupling assembly (500) is installed in the groove (404) for providing a stable coupling agent during flaw detection.

2. The non-destructive ultrasonic flaw detection device for seamless steel pipes according to claim 1, characterized in that, The coupling assembly (500) includes a U-shaped water storage frame (501), a water storage area (502) is formed between the water storage frame (501) and the seamless steel pipe (700), and a stable water film layer is formed when the coupling agent in the water storage area (502) flows through the surface of the seamless steel pipe (700); and a water outlet nozzle (508) is installed on the water storage frame (501), and a water pipe (504) is connected to the water outlet nozzle (508).

3. The non-destructive ultrasonic flaw detection device for seamless steel pipes according to claim 2, characterized in that, A drain hole (507) is provided on the side surface of the water storage frame (501), and a laser level sensor (506) is installed on the water storage frame (501), and an electromagnetic flow valve (505) is installed on the water pipe (504).

4. The non-destructive ultrasonic flaw detection device for seamless steel pipes according to claim 3, characterized in that, The water storage frame (501) includes a back plate and a pair of arc-shaped side plates connected to both ends of the back plate; and a sealing strip (503) is fixedly installed at the bottom of the water storage frame (501).

5. An ultrasonic non-destructive testing device for seamless steel pipes according to claim 4, characterized in that, A fine-thread screw (509) is fixedly connected to the water storage frame (501), and the fine-thread screw (509) is fixedly connected to the probe seat (402) through a locking nut (510); and a vertical sliding groove (405) is provided on the inner wall of the groove (404), and a sliding strip (511) slidingly connected to the sliding groove (405) is provided on the surface of the water storage frame (501).

6. The non-destructive ultrasonic flaw detection device for seamless steel pipes according to claim 5, characterized in that, The transverse transfer mechanism (200) includes a track plate (202), a servo motor (203), and a ball screw (205); a screw seat (206) threadedly connected to the ball screw (205) is installed on the flaw detection trolley (201), the flaw detection trolley (201) is slidably connected to the track plate (202), and an electric control box (204) is installed on the flaw detection trolley (201).

7. An ultrasonic non-destructive testing device for seamless steel pipes according to claim 6, characterized in that, The rotating mechanism (100) includes a frame (101), a pair of rotating shafts (102) rotatably connected to the frame (101), and support wheels (103) installed on the rotating shafts (102); a driving motor (104) is installed on the frame (101), and the driving motor (104) is connected to the rotating shaft (102).

8. An ultrasonic non-destructive testing device for seamless steel pipes according to claim 7, characterized in that, A plurality of rollers (403) capable of contacting the seamless steel pipe (700) are installed at the bottom of the probe holder (402).

9. An ultrasonic non-destructive testing device for seamless steel pipes according to claim 8, characterized in that, A bracket (304) is fixedly connected to the lifting frame (301), and a camera (305) is installed on the bracket (304).

10. A flaw detection method for seamless steel pipes, using a non-destructive ultrasonic flaw detection device for seamless steel pipes as described in claim 9, characterized in that, It includes the following steps: Step 1: Place the seamless steel pipe (700) on the rotating mechanism (100), and the rotating mechanism (100) drives the seamless steel pipe (700) to rotate slowly; Step 2: Move the flaw detection trolley (201) to one end of the horizontal transfer mechanism (200). The first lifting cylinder (302) drives the lifting frame (301) to a specified height, and then the second lifting cylinder (303) drives the probe assembly (400) to descend until the probe holder (402) contacts the surface of the seamless steel pipe (700); Step 3: While the probe assembly (400) descends, it drives the water storage frame (501) to descend until it contacts the surface of the seamless steel pipe (700). Then, the coupling agent flows out of the water outlet nozzle (508) and is stored in the water storage area (502). The coupling agent in the water storage area (502) flows over the surface of the seamless steel pipe (700) to form a stable water film layer; Step 4: The horizontal transfer mechanism (200) drives the flaw detection trolley (201) to move slowly horizontally. During the movement, the ultrasonic probe (406) performs flaw detection on the surface of the seamless steel pipe (700).

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