An ultrasonic phased array testing device for butt joints of thin-walled austenitic stainless steel pipes

Abstract

This invention relates to the field of ultrasonic phased array testing technology, specifically disclosing an ultrasonic phased array testing device for butt joints of thin-walled austenitic stainless steel pipes. The device includes a mounting base consisting of two L-shaped plates, with a ring-shaped centering and clamping mechanism positioned between them. This ring-shaped centering and clamping mechanism comprises a first semi-circular plate, a second semi-circular plate, a hinged bolt, a ring-shaped scanning track, a mounting assembly, a V-shaped positioning assembly, a quick-lock latch, a quick-lock groove, and a mounting base. Because the double-cone structure of the V-shaped roller forms two symmetrical contact generatrices with the outer wall of the steel pipe, its geometric constraint causes the rotation center of the ring-shaped centering and clamping mechanism to automatically coincide with the axis of the steel pipe, thus achieving self-centering. This effectively solves the problem of difficulty in maintaining precise alignment between the probe and the weld center when the pipe diameter has slight tolerances or ellipticity, leading to a decrease in the repeatability of the detection signal.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic phased array testing technology, and in particular to an ultrasonic phased array testing device for butt joints of thin-walled austenitic stainless steel pipes. Background Technology

[0002] Thin-walled austenitic stainless steel pipe is a thin-walled pipe made of austenitic stainless steel. With its excellent corrosion resistance, plasticity, weldability and lightweight characteristics, it has become the core pipe material in water supply, gas, medical, automotive and other fields. The core materials are mainly 304, 304L and 316L, which have the advantages of thin wall thickness and high precision.

[0003] In the non-destructive testing of butt joints of thin-walled austenitic stainless steel pipes, ultrasonic phased array technology is widely used due to its high resolution and flexible beam control capabilities.

[0004] In existing detection devices, the centering and guiding mechanisms lack an effective radial adaptive adjustment mechanism. When there are slight tolerances or ellipticity in the pipe diameter, it is difficult to maintain the precise alignment between the probe and the weld center, resulting in a decrease in the repeatability of the detection signal. Summary of the Invention

[0005] The purpose of this invention is to provide an ultrasonic phased array testing device for butt joints of thin-walled austenitic stainless steel pipes, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an ultrasonic phased array testing device for butt joints of thin-walled austenitic stainless steel pipes, comprising a mounting base, wherein the mounting base is two L-shaped plates, and an annular centering and clamping mechanism is provided between the two mounting bases. The annular centering and clamping mechanism includes a first semi-circular arc plate, a second semi-circular arc plate, a hinge bolt, an annular scanning track, a mounting component, a V-shaped positioning component, a quick-lock latch, a quick-lock groove, and a mounting seat. The bottom of the first and second semi-circular arc plates are respectively hinged to one of the hinge bolts. The annular scanning track is provided on the surfaces of both the first and second semi-circular arc plates. The mounting component is located within the annular scanning track and is slidably connected to the annular scanning track. The mounting seat is embedded in the inner wall of the first and second semi-circular arc plates. Multiple sets of mounting seats are provided, and each set of mounting seats consists of two... Each set of mounting bases is provided with a corresponding V-shaped positioning component; the V-shaped positioning component includes two mounting blocks and a threaded block. The mounting blocks are fixedly connected to the threaded blocks, and the threaded blocks are threadedly connected to the mounting base. A mounting bracket is provided on the side of the mounting block away from the threaded block. The mounting bracket is U-shaped. Two roller frames are provided between the mounting brackets. A V-shaped roller is installed on the side of each roller frame. The V-shaped roller is rotatably connected to the roller frame. The two V-shaped rollers are V-shaped. A threaded drive rod is provided between the two roller frames. The threaded drive rod passes through the two roller frames and is threadedly connected to the roller frames. The thread direction of the threaded drive rod is opposite at the positions of the two roller frames. The axis of the V-shaped roller is parallel to the axis of the steel pipe to be tested. The V-shaped groove of the V-shaped roller forms a line contact with the outer wall of the steel pipe for positioning.

[0007] Preferably, the V-shaped positioning assembly further includes a movable groove, which is formed on the side of the mounting block. A slide rod is fixedly connected inside the movable groove, and a slider is slidably sleeved on the surface of the slide rod. A first compression spring is provided on the side of the slider and is sleeved on the surface of the slide rod. A first hinge seat is provided on the top of the slider, and a connecting plate is provided on the side of the first hinge seat. The connecting plate is hinged to the first hinge seat. A second hinge seat is provided at the other end of the connecting plate and is hinged to the second hinge seat. The second hinge seat is fixedly connected to the roller frame, and a rotating handle is fixedly connected to one end of the threaded drive rod.

[0008] Preferably, the mounting assembly includes a placement plate that is matched and connected to a circular scanning track and is slidably connected to the circular scanning track. A positioning matching plate is provided on the top of the placement plate, an installation groove is provided on the surface of the placement plate, and a circular motion scanning mechanism is provided on the upper part of the placement plate.

[0009] Preferably, the circular motion scanning mechanism includes a scanning carriage, a probe driving assembly, a probe constant pressure clamping assembly, and a coupling agent coating assembly. The scanning carriage includes a chassis and a side positioning plate. The chassis contacts a placement plate, and the side positioning plate is located on the side of the chassis. The side positioning plate is matched and connected to a positioning matching plate and fixed by bolts. A drive wheel is provided at the lower part of the chassis. The drive wheel passes through a mounting groove and contacts an annular scanning track. The drive wheel is equipped with a dual-head drive motor. A ball bearing is also provided at the lower part of the chassis. The ball bearing passes through a mounting groove and contacts an annular scanning track, and the ball bearing is rotatably connected to the chassis.

[0010] Preferably, the probe driving assembly includes a cantilever bracket, which is fixedly connected to the chassis. A first electric push rod is provided on the top side of the cantilever bracket. A crossbeam is provided at the driving end of the first electric push rod. A second electric push rod is provided on the upper part of the crossbeam. A guide hole is opened in the middle of the crossbeam. The second electric push rod passes through the guide hole. A plurality of mounting holes are opened at the bottom of the mounting plate. A probe constant pressure clamping assembly is provided in the mounting holes. A second compression spring is sleeved on the surface of the electric push rod between the guide hole and the mounting plate. The two ends of the second compression spring are respectively connected to the output ends of the mounting plate and the second electric push rod. The second electric push rod is connected to the mounting plate through the second compression spring.

[0011] Preferably, the constant pressure clamping assembly for the probe includes a threaded mounting component, which is threadedly connected to a mounting hole. A U-shaped bracket is fixedly connected to the bottom of the threaded mounting component, and a rotating component is disposed between the U-shaped brackets. A probe mounting component is fixedly disposed at the bottom of the rotating component, and the probe mounting component is rotatably connected to the U-shape through the rotating component.

[0012] Preferably, the probe mounting component is equipped with an ultrasonic phased array probe inside, and the bottom of the probe mounting component is provided with an inwardly concave arc-shaped contact surface that matches the curvature of the outer diameter of the steel pipe, which is used to load the ultrasonic phased array probe and ensure that it always points perpendicularly to the center of the weld.

[0013] Preferably, the probe mounting component has self-lubricating wear-resistant gaskets on both sides of the concave arc-shaped contact surface. The gaskets are made of polytetrafluoroethylene and are used to reduce the frictional resistance when the probe slides on the steel pipe surface and to prevent scratching the pipe wall. The bottom of the probe mounting component is also provided with a coupling agent return groove to discharge excess coupling agent.

[0014] Preferably, the coupling agent coating assembly includes a coupling agent storage chamber located on the upper surface of the chassis, a delivery pipe is provided on the side of the coupling agent storage chamber, and a coupling agent nozzle is provided at the end of the delivery pipe away from the coupling agent storage chamber.

[0015] Preferably, the mating end faces of the first and second semicircular arc plates of the annular centering clamping mechanism are provided with a tongue-and-groove anti-misalignment structure, which ensures that the annular scanning track surfaces of the two semicircular rings are smoothly mated when the locking buckle is closed, with a mating gap of less than 0.1mm.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. In this invention, the first and second semi-circular arc plates are rotated open to approximately 180° around the hinge bolt, making the entire annular centering and clamping mechanism open. This mechanism is then fitted onto the outer wall of the steel pipe to be tested. At this time, the V-shaped rollers are located at four equal divisions of the steel pipe's circumference. By manually rotating the threaded drive rod, the threaded drive rod can rotate between the two roller frames. Since the position of the roller frames is limited by the connecting plate, and the connecting plate can rotate through the first and second hinge seats, the V-shaped rollers will rotate. The radial position of the V-shaped roller is changed until the V-shaped groove of the V-shaped roller forms a stable line contact with the outer wall of the steel pipe. Since the double-cone structure of the V-shaped roller and the outer wall of the steel pipe form two symmetrical contact generatrices, its geometric constraint effect makes the rotation center of the annular centering clamping mechanism automatically coincide with the axis of the steel pipe, thereby realizing the self-centering function. During this process, the adjustment stroke of the threaded drive rod can compensate for the installation gap caused by the ellipticity or diameter tolerance of the steel pipe, ensuring that the device can maintain high repeatability positioning accuracy between batches of different pipe diameters.

[0018] 2. This invention, by closing the quick-lock latch and quick-slot and fixing them with bolts, allows the first and second semi-circular arc plates to be tightly joined through a tongue-and-groove structure, forming a complete annular structure. This structure not only restricts the relative displacement of the two semi-circular arc plates in the axial and radial directions, but also enables the annular scanning track to achieve a continuous and smooth transition at the joint, with the joint gap controlled within the range of ≤20μm. This micron-level jointing accuracy effectively avoids vibration or jumping caused by track discontinuity when the scanning carriage crosses the joint, ensuring the stability of the scanning movement.

[0019] 3. In this invention, the scanning carriage of the circular motion scanning mechanism is placed on the surface of the placement plate, and the drive wheel and ball bearings pass through the mounting groove. The bolts between the positioning matching plate and the side positioning plate are tightened to prevent them from falling off during operation. Then, the ultrasonic phased array probe is installed in the probe mounting component. The position of the limit stop is adjusted to fix the lateral position of the probe. The first electric push rod pushes the crossbeam to adjust the axial position of the probe so that it is aligned with the center of the weld. The second electric push rod passes through the guide hole of the crossbeam and is fixed to the surface of the crossbeam by connecting bolts. According to the actual axial position of the weld, the first electric push rod pushes the crossbeam to adjust the axial position of the probe. Position the probe so that it is directly aligned with the center of the weld, ensuring the center of the probe's acoustic beam is aligned with the weld fusion line. At this point, the second compression spring is in a pre-compressed state, and its elastic force is transmitted through the spring seat to the U-shaped bracket and the probe mounting component, causing the concave arc-shaped contact surface at the bottom of the probe mounting component to press against the outer wall of the steel pipe. The radius of curvature of the concave arc-shaped contact surface matches the outer diameter of the steel pipe, ensuring that the probe wafer array plane is locally conformal to the surface of the steel pipe, thereby keeping the incident angle of the ultrasonic beam constant throughout the entire scanning process. Meanwhile, the self-lubricating wear-resistant pad is made of polytetrafluoroethylene, whose low coefficient of friction and self-lubricating properties reduce the sliding resistance of the probe as it moves with the scanning carriage, preventing probe posture deflection due to friction. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a structural diagram of the main body of the present invention;

[0022] Figure 2 This is a schematic diagram of the installation structure of the annular centering and clamping mechanism and the circular motion scanning mechanism in this invention;

[0023] Figure 3 This is a schematic diagram of the annular centering and clamping mechanism in this invention;

[0024] Figure 4 This is a schematic diagram of the structure of the first and second semicircular arc plates in this invention;

[0025] Figure 5 This is a schematic diagram of the installation components in this invention;

[0026] Figure 6 This is a schematic diagram of the V-shaped positioning component in this invention;

[0027] Figure 7 For the present invention Figure 6 Enlarged view of point A in the middle;

[0028] Figure 8 This is a schematic diagram of the circular motion scanning mechanism in the present invention. Figure 1 ;

[0029] Figure 9 This is a schematic diagram of the circular motion scanning mechanism in the present invention. Figure 2 ;

[0030] Figure 10 This is a schematic diagram of the probe constant pressure clamping assembly in this invention;

[0031] Figure 11 This is a schematic diagram of the threaded drive rod in this invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Install the substrate;

[0034] 2. Circular centering and clamping mechanism; 21. First semi-circular arc plate; 22. Second semi-circular arc plate; 23. Hinged bolt; 24. Circular scanning track; 25. Mounting assembly; 251. Placement plate; 252. Positioning and matching plate; 253. Mounting slot; 26. V-shaped positioning assembly; 261. Mounting block; 262. Threaded block; 263. Mounting bracket; 264. Roller frame; 265. V-shaped roller; 266. Threaded drive rod; 267. Rotating handle; 268. Moving slot; 269. First compression spring; 2610. Slide rod; 2611. Slider; 2612. Connecting plate; 2613. First hinge seat; 2614. Second hinge seat; 27. Quick-lock latch; 28. Quick-lock slot; 29. ​​Mounting seat;

[0035] 3. Circular motion scanning mechanism; 31. Scanning carriage; 311. Chassis; 312. Side positioning plate; 313. Drive wheel; 314. Dual-head drive motor; 315. Ball bearing; 32. Probe drive assembly; 321. Cantilever bracket; 322. First electric push rod; 323. Crossbeam; 324. Second electric push rod; 325. Second compression spring; 326. Mounting plate; 327. Mounting hole; 33. Probe constant pressure clamping assembly; 331. Threaded mounting part; 332. U-shaped bracket; 333. Rotating part; 334. Probe mounting part; 335. Self-lubricating wear-resistant gasket; 336. Coupling agent return channel; 337. Ultrasonic phased array probe; 34. Coupling agent coating assembly; 341. Coupling agent storage chamber; 342. Delivery pipe; 343. Coupling agent nozzle. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please see Figures 1 to 11 The present invention provides a technical solution:

[0038] An ultrasonic phased array testing device for butt joints of thin-walled austenitic stainless steel pipes includes a mounting base plate 1, an annular centering and clamping mechanism 2, and a circular motion scanning mechanism 3. The annular centering and clamping mechanism 2 is used to stably mount the entire device on the outer wall of the steel pipe to be tested and ensure that its geometric center coincides with the axis of the steel pipe. The circular motion scanning mechanism 3 moves in a circular motion along an annular scanning track 24, driving the ultrasonic phased array probe 337 to continuously scan the weld area. The mounting base plate 1 consists of two L-shaped plates, and the annular centering and clamping mechanism 2 is provided between the two mounting base plates 1.

[0039] like Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, the annular centering and clamping mechanism 2 includes a first semi-circular plate 21, a second semi-circular plate 22, a hinge bolt 23, an annular scanning track 24, a mounting assembly 25, a V-shaped positioning assembly 26, a quick-lock latch 27, a quick-lock groove 28, and a mounting base 29. The bottoms of the first semi-circular plate 21 and the second semi-circular plate 22 are respectively hinged to a hinge bolt 23. An annular scanning track 24 is integrally formed on the outer circumference of the first semi-circular plate 21 and the second semi-circular plate 22. The track has a T-shaped cross-section, and its geometric center coincides with the axis of the steel pipe to be tested. The first semicircular plate 21 and the second semicircular plate 22 are arranged symmetrically. One end of each plate is hinged by a hinge bolt 23, and the other end is provided with a quick-lock buckle 27 and a quick-lock groove 28. When the quick-lock buckle 27 and the quick-lock groove 28 are in the open state, the first semicircular plate 21 and the second semicircular plate 22 can be rotated and unfolded around the hinge bolt 23, making it easy to be fitted onto the outside of the steel pipe to be tested. When the quick-lock buckle 27 and the quick-lock groove 28 are closed, the first semicircular plate 21 and the second semicircular plate 22 form a complete ring structure, which wraps around the outer wall of the steel pipe.

[0040] The first semicircular arc plate 21 and the second semicircular arc plate 22 are respectively machined with mutually matching tongue and groove structures (not shown in the figure). The tongue and groove structure includes a boss on the end face of the first semicircular arc plate 21 and a groove on the end face of the second semicircular arc plate 22. When the quick-lock latch 27 and the quick-lock groove 28 are closed, the boss is embedded in the groove, so that the annular scanning track 24 of the two semicircular arc plates forms a continuous and smooth transition at the docking point. The docking gap is controlled within the micrometer range, thereby ensuring that the scanning carriage 31 does not jump or get stuck when running on the track.

[0041] The mounting component 25 is located within the annular scanning track 24 and is slidably connected to the annular scanning track 24. The mounting base 29 is embedded in the inner wall of the first semi-circular plate 21 and the second semi-circular plate 22. Multiple sets of mounting bases 29 are provided, with two mounting bases 29 in each set. Each set of mounting bases 29 is correspondingly provided with a V-shaped positioning component 26. The V-shaped positioning component 26 includes two mounting blocks 261 and a threaded block 262. The mounting blocks 261 are fixedly connected to the threaded blocks 262, and the threaded blocks 262 are threadedly connected to the mounting base 29. The mounting blocks 261 are far from the mounting base 29. A mounting bracket 263 is provided on one side of the threaded block 262. The mounting bracket 263 is U-shaped, and two roller frames 264 are arranged between the mounting brackets 263. Each roller frame 264 has a V-shaped roller 265 mounted on its side. The V-shaped rollers 265 are rotatably connected to the roller frame 264, and the two V-shaped rollers 265 are arranged in a V-shape. A threaded drive rod 266 is provided between the two roller frames 264. The threaded drive rod 266 passes through the two roller frames 264 and is threadedly connected to the roller frames 264. The threaded directions of the drive rod 266 at the two roller brackets 264 are opposite. The axis of the V-shaped roller 265 is parallel to the axis of the steel pipe to be tested. The V-shaped roller 265 forms line contact with the outer wall of the steel pipe through the V-shaped groove of the V-shaped roller 265 for positioning. The V-shaped positioning assembly 26 also includes a moving groove 268, which is opened on the side of the mounting block 261. A slide rod 2610 is fixedly connected inside the moving groove 268. A slider 2611 is slidably sleeved on the surface of the slide rod 2610. A first compression spring 269 is provided on the side of the slider 2611. A compression spring 269 is sleeved on the surface of the slide bar 2610. A first hinge seat 2613 is provided on the top of the slider 2611. A connecting plate 2612 is provided on the side of the first hinge seat 2613. The connecting plate 2612 is hinged to the first hinge seat 2613. A second hinge seat 2614 is provided at the other end of the connecting plate 2612. The other end of the connecting plate 2612 is hinged to the second hinge seat 2614. The second hinge seat 2614 is fixedly connected to the roller frame 264. A rotating handle 267 is fixedly connected to one end of the threaded drive rod 266.

[0042] Rotating the handle 267 can drive the threaded drive rod 266 to rotate, allowing the threaded drive rod 266 to rotate between the two roller frames 264. Since the position of the roller frames 264 is limited by the connecting plate 2612, and the connecting plate 2612 can rotate through the first hinge seat 2613 and the second hinge seat 2614, the V-shaped roller 265 will rotate, thereby changing the radial position of the V-shaped roller 265 and changing the included angle between the two V-shaped rollers 265. This adjusts the contact pressure and positioning diameter between the V-shaped roller 265 and the outer wall of the steel pipe. The V-shaped roller 265 forms a line contact with the outer wall of the steel pipe through its V-shaped groove, which not only provides support but also allows the device to rotate freely around the axis on the steel pipe, while avoiding local stress concentration or slippage instability caused by point contact.

[0043] In this embodiment, it should be further explained that the mounting component 25 includes a placement plate 251, which is matched and connected to the annular scanning track 24, and the placement plate 251 is slidably connected to the annular scanning track 24. A positioning matching plate 252 is provided on the top of the placement plate 251, and an installation groove 253 is provided on the surface of the placement plate 251. A circular motion scanning mechanism 3 is provided on the upper part of the placement plate 251.

[0044] like Figure 8 , Figure 9 , Figure 10 and Figure 11 As shown, the circular motion scanning mechanism 3 includes a scanning carriage 31, a probe driving assembly 32, a probe constant pressure clamping assembly 33, and a coupling agent coating assembly 34. The scanning carriage 31 includes a chassis 311 and a side positioning plate 312. The chassis 311 contacts the placement plate 251. The side positioning plate 312 is located on the side of the chassis 311 and is matched and connected to the positioning matching plate 252 and fixed by bolts. A drive wheel 313 is provided at the lower part of the chassis 311. The drive wheel 313 passes through the mounting groove 253 and contacts the annular scanning track 24. The drive wheel 313 is equipped with a dual-head drive motor 314. A ball bearing 315 is also provided at the lower part of the chassis 311. The ball bearing 315 passes through the mounting groove 253 and contacts the annular scanning track 24, and the ball bearing 315 is rotatably connected to the chassis 311.

[0045] In this embodiment, it should be further explained that the probe driving assembly 32 includes a cantilever bracket 321, which is fixedly connected to the chassis 311. A first electric push rod 322 is provided on the top side of the cantilever bracket 321. A crossbeam 323 is provided at the driving end of the first electric push rod 322. A second electric push rod 324 is provided on the upper part of the crossbeam 323. A guide hole is opened in the middle of the crossbeam 323, and the second electric push rod 324 passes through the guide hole. A plurality of mounting holes 327 are opened at the bottom of the mounting plate 326. The mounting holes 327 are provided with... The device includes a constant pressure clamping assembly 33 for the probe. A second compression spring 325 is fitted onto the surface of the electric push rod between the guide hole and the mounting plate 326. The two ends of the second compression spring 325 are connected to the output ends of the mounting plate 326 and the second electric push rod 324, respectively. The second electric push rod 324 is connected to the mounting plate 326 through the second compression spring 325. This structure allows the probe mounting component 334 to have elastic floating capability in the vertical direction, which can automatically adjust the probe fitting state according to the curvature of the outer wall of the steel pipe and always maintain a constant contact pressure.

[0046] In this embodiment, it should be further explained that the constant pressure clamping assembly 33 for the probe includes a threaded mounting part 331, which is threadedly connected to the mounting hole 327. A U-shaped bracket 332 is fixedly connected to the bottom of the threaded mounting part 331, and a rotating part 333 is arranged between the U-shaped brackets 332. A probe mounting part 334 is fixedly arranged at the bottom of the rotating part 333. The probe mounting part 334 is rotatably connected to the U-shaped bracket 332 through the rotating part 333. An ultrasonic phased array probe 337 is arranged inside the probe mounting part 334. The bottom of the probe mounting part 334 has an inwardly concave arc-shaped contact surface with the curvature of the outer diameter of the steel pipe, which is used to load the ultrasonic phased array probe 337 and ensure that it always points perpendicularly to the center of the weld. The inwardly concave arc-shaped contact surface of the probe mounting part 334 has two sides. A self-lubricating wear-resistant gasket 335, made of polytetrafluoroethylene, is provided to reduce the frictional resistance when the probe slides on the steel pipe surface and to prevent scratching the pipe wall. Its outer surface is in direct contact with the outer wall of the steel pipe. The gasket is fixed to the inner wall of the probe mounting component 334 by countersunk screws. Limiting blocks are symmetrically arranged on the inner sides of the two arms of the U-shaped bracket 332. The limiting blocks are fixed to the side wall of the U-shaped bracket 332 by threaded connection to limit the lateral displacement of the ultrasonic phased array probe 337 during the clamping process. In addition, a couplant return groove 336 is provided at the center of the concave arc-shaped contact surface at the bottom of the probe mounting component 334. The couplant return groove 336 extends in the circumferential direction and is connected to the outside at both ends to guide the discharge of excess couplant and prevent accumulation from affecting the coupling effect of the probe.

[0047] In this embodiment, it should be further explained that the coupling agent coating assembly 34 includes a coupling agent storage chamber 341, which is located on the upper surface of the chassis 311. A delivery pipe 342 is provided on the side of the coupling agent storage chamber 341, and a coupling agent nozzle 343 is provided at the end of the delivery pipe 342 away from the coupling agent storage chamber 341.

[0048] Further explanation of this embodiment is needed: the outer surface of the annular scanning track 24 is engraved with circumferential angle scale lines (not shown in the figure). The scale lines are evenly divided into 360° circles, with a minimum division value of 1°. An alignment pointer is fixedly installed on the edge of the chassis 311 of the scanning vehicle 31. The tip of the alignment pointer is directly opposite the plane where the scale line is located, which is used to indicate the current scanning angle position. This allows the operator to grasp the position information of the probe relative to the weld in real time, and achieve accurate angle positioning and data recording. A level mounting base (not shown in the figure) is provided on the upper surface of the chassis 311 of the scanning vehicle 31. The level mounting base is a rectangular groove structure with a magnetic or adhesive layer on its inner wall for adsorbing or attaching an electronic level. In the horizontal pipeline inspection operation, it helps to determine whether the overall installation posture of the device is in a horizontal state, and ensures the consistency of the probe beam direction and the geometric relationship of the weld during the inspection process.

[0049] In actual testing, firstly, the first semicircular plate 21 and the second semicircular plate 22 are opened around the hinge bolt 23 and fitted onto the outer wall of the thin-walled austenitic stainless steel tube to be tested. The threaded drive rod 266 of the V-shaped roller 265 is adjusted to make the V-shaped roller 265 form a stable line contact with the outer wall of the steel tube, and to ensure that the geometric center of the entire annular centering clamping mechanism 2 coincides with the axis of the steel tube. Then, the quick-lock buckle 27 and the quick-lock groove are closed and fixed with bolts, so that the first semicircular plate 21 and the second semicircular plate 22 are tightly connected through the tongue and groove structure to form a complete annular structure. Next, the scanning carriage 31 of the circular motion scanning mechanism 3 is placed on the surface of the placement plate 251, and the drive wheel 313 and the ball bearing 315 pass through the mounting groove 253. The bolts between the positioning matching plate 252 and the side positioning plate 312 are tightened to prevent them from falling off during operation. The ultrasonic phased array probe 337 is then installed in the probe mounting bracket 334. The position of the limit block is adjusted to fix the lateral position of the probe, and the crossbeam 323 is pushed by the first electric push rod 322 to adjust the axial position of the probe so that it is directly facing the center of the weld. The delivery pipe 342 is connected to the coupling agent storage chamber 341, and the dual-head drive motor 314 is started to drive the drive wheel 313 to rotate, thereby driving the scanning carriage 31 to move in a uniform circular motion along the annular scanning track 24. At this time, the valve is opened, and the coupling agent is evenly applied to the surface of the steel pipe through the coupling agent nozzle 343. Under the action of the second compression spring 325, the probe always maintains constant pressure contact with the outer wall of the steel pipe to complete the ultrasonic phased array scanning of the weld area. Throughout the process, the alignment pointer and the circumferential angle scale line are coordinated to display the probe angle position in real time, which is convenient for subsequent data analysis and defect location.

[0050] To enable those skilled in the art to fully understand and implement this invention, the specific implementation principles of this invention are further supplemented below with a specific application scenario.

[0051] When performing ultrasonic phased array testing on the butt weld of a thin-walled austenitic stainless steel pipe with an outer diameter of 50 mm and a wall thickness of 2.5 mm, the first semi-circular plate 21 and the second semi-circular plate 22 are first rotated open to about 180° around the hinge bolt 23, so that the entire annular centering clamping mechanism 2 is in an open state. Then, it is fitted onto the outer wall of the steel pipe to be tested. At this time, the V-shaped rollers 265 are respectively located at the four equal parts of the circumference of the steel pipe. By manually rotating the threaded drive rod 266, the threaded drive rod 266 can rotate between the two roller frames 264. Since the position of the roller frames 264 is limited by the connecting plate 2612, and the connecting plate 2612 can be connected through the first hinge seat 26 13 and the second hinge seat 2614 rotate, so the V-shaped roller 265 will rotate, thereby changing the radial position of the V-shaped roller 265 until the V-shaped groove of the V-shaped roller 265 forms a stable line contact with the outer wall of the steel pipe. Since the double cone structure of the V-shaped roller 265 and the outer wall of the steel pipe form two symmetrical contact generatrices, its geometric constraint makes the rotation center of the annular centering clamping mechanism 2 automatically coincide with the axis of the steel pipe, thereby realizing the self-centering function. In this process, the adjustment stroke of the threaded drive rod 266 can compensate for the installation gap caused by the ellipticity or diameter tolerance of the steel pipe, ensuring that the device can maintain high repeatability positioning accuracy between batches of different pipe diameters.

[0052] Subsequently, the quick-lock latch 27 and quick-lock groove are closed and fixed with bolts, so that the first semi-circular plate 21 and the second semi-circular plate 22 are tightly connected through the tongue and groove structure to form a complete ring structure. This structure not only restricts the relative displacement of the two semi-circular plates in the axial and radial directions, but also enables the ring scanning track 24 to achieve a continuous and smooth transition at the docking point, with the docking gap controlled within the range of ≤20μm. This micron-level docking accuracy effectively avoids the vibration or jumping caused by the discontinuity of the track when the scanning carriage 31 crosses the seam, ensuring the stability of the scanning movement.

[0053] Next, the scanning carriage 31 of the circular motion scanning mechanism 3 is placed on the surface of the placement plate 251, and the drive wheel 313 and ball bearing 315 are passed through the mounting groove 253. The bolts between the positioning matching plate 252 and the side positioning plate 312 are tightened to prevent them from falling off during operation. Then, the ultrasonic phased array probe 337 is installed in the probe mounting part 334. The position of the limit stop is adjusted to fix the transverse position of the probe. The first electric push rod 322 pushes the crossbeam 323 to adjust the axial position of the probe so that it is aligned with the center of the weld. The second electric push rod 324 passes through the guide hole of the crossbeam 323 and is fixed to the surface of the crossbeam 323 by connecting bolts. According to the actual axial position of the weld, the first electric push rod 322 pushes the crossbeam 323. 23. Adjust the axial position of the probe so that it is directly opposite the center of the weld and the center of the probe beam is directly opposite the weld fusion line. At this time, the second compression spring 325 is in a pre-compressed state, and its elastic force is transmitted to the U-shaped bracket 332 and the probe mounting part 334 through the spring seat, so that the concave arc-shaped contact surface at the bottom of the probe mounting part 334 presses against the outer wall of the steel pipe. The radius of curvature of the concave arc-shaped contact surface matches the outer diameter of the steel pipe, ensuring that the probe crystal array plane is locally conformal with the surface of the steel pipe, so that the incident angle of the ultrasonic beam remains constant during the whole scan. At the same time, the self-lubricating wear-resistant pad 335 is made of polytetrafluoroethylene. Its low coefficient of friction and self-lubricating properties reduce the sliding resistance of the probe when it moves with the scanning carriage 31, and avoid the probe posture deflection due to friction.

[0054] The dual-head drive motor 314 is activated to drive the drive wheel 313 to rotate, thereby driving the scanning carriage 31 to move in a uniform circular motion along the annular scanning track 24. During the entire scanning process, the alignment pointer rotates synchronously with the scanning carriage 31, and its tip always points to the circumferential angle scale line on the outer side of the annular scanning track 24. The operator can accurately record the angular coordinates corresponding to the defect echo signal by reading the pointer position in real time, providing reference data for subsequent three-dimensional imaging and defect location. At the same time, an electronic level is adsorbed in the level mounting seat set on the upper surface of the chassis 311 of the scanning carriage 31 to monitor the installation tilt angle of the entire annular centering clamping mechanism and the scanning carriage relative to the horizontal plane. When the steel pipe under test is tilted or the clamping mechanism is deflected due to uneven pressure of the V-shaped rollers, the placement plate 251 and the chassis 311 of the scanning carriage will tilt synchronously. The electronic level can detect the tilt angle change in real time and guide the operator to adjust the contact pressure distribution of the V-shaped rollers 265 to ensure that the ultrasonic phased array probe beam is perpendicularly incident on the weld area, ensuring detection sensitivity and positioning accuracy.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An apparatus for ultrasonic phased array inspection of a butt joint of a thin- walled austenitic stainless steel pipe, characterized by: The system includes a mounting base (1), which consists of two L-shaped plates. A ring-shaped centering and clamping mechanism (2) is provided between the two mounting bases (1). The ring-shaped centering and clamping mechanism (2) includes a first semi-circular arc plate (21), a second semi-circular arc plate (22), a hinge bolt (23), a ring-shaped scanning track (24), a mounting assembly (25), and a mounting base (29). The bottoms of the first semi-circular arc plate (21) and the second semi-circular arc plate (22) are respectively hinged to one of the hinge bolts (23). The circular scanning track (24) is provided on the surfaces of the first semicircular plate (21) and the second semicircular plate (22). The mounting component (25) is located inside the circular scanning track (24) and is slidably connected to the circular scanning track (24). The mounting seat (29) is embedded in the inner wall of the first semicircular plate (21) and the second semicircular plate (22). There are multiple sets of mounting seats (29), and each set of mounting seats (29) consists of two seats. Each set of mounting seats (29) is provided with a corresponding V-shaped positioning component (26). The V-shaped positioning assembly (26) includes two mounting blocks (261) and a threaded block (262). The mounting blocks (261) are fixedly connected to the threaded block (262), and the threaded block (262) is threadedly connected to the mounting base (29). A mounting bracket (263) is provided on the side of the mounting block (261) away from the threaded block (262). The mounting bracket (263) is U-shaped, and two roller frames (264) are provided between the mounting brackets (263). Each roller frame (264) has a V-shaped roller (265) mounted on its side. Rotatably connected to the roller frame (264), two V-shaped rollers (265) are arranged in a V shape. A threaded drive rod (266) is provided between the two roller frames (264). The threaded drive rod (266) passes through the two roller frames (264) and is threadedly connected to the roller frame (264). The threaded directions of the threaded drive rod (266) at the positions of the two roller frames (264) are opposite. The axis of the V-shaped roller (265) is parallel to the axis of the steel pipe to be tested. The V-shaped groove of the V-shaped roller (265) forms a line contact with the outer wall of the steel pipe for positioning.

2. An apparatus for ultrasonic phased array inspection of a butt joint of a thin- walled austenitic stainless steel pipe according to claim 1, characterized in that: The V-shaped positioning component (26) further includes a moving groove (268), which is located on the side of the mounting block (261). A sliding rod (2610) is fixedly connected inside the moving groove (268). A slider (2611) is slidably sleeved on the surface of the sliding rod (2610). A first compression spring (269) is provided on the side of the slider (2611), and the first compression spring (269) is sleeved on the surface of the sliding rod (2610). A first hinge seat is provided on the top of the slider (2611). 2613), the first hinge seat (2613) is provided with a connecting plate (2612) on its side, the connecting plate (2612) is hinged to the first hinge seat (2613), the other end of the connecting plate (2612) is provided with a second hinge seat (2614), the other end of the connecting plate (2612) is hinged to the second hinge seat (2614), the second hinge seat (2614) is fixedly connected to the roller frame (264), and one end of the threaded drive rod (266) is fixedly connected with a rotating handle (267).

3. The ultrasonic phased array testing device for butt joints of thin-walled austenitic stainless steel pipes according to claim 1, characterized in that: The mounting assembly (25) includes a placement plate (251), which is matched and connected to the annular scanning track (24) and is slidably connected to the annular scanning track (24). A positioning matching plate (252) is provided on the top of the placement plate (251), and an installation groove (253) is provided on the surface of the placement plate (251). A circular motion scanning mechanism (3) is provided on the upper part of the placement plate (251).

4. The ultrasonic phased array testing device for butt joints of thin-walled austenitic stainless steel pipes according to claim 3, characterized in that: The circular motion scanning mechanism (3) includes a scanning carriage (31), a probe driving assembly (32), a probe constant pressure clamping assembly (33), and a coupling agent coating assembly (34). The scanning carriage (31) includes a chassis (311) and a side positioning plate (312). The chassis (311) contacts the placement plate (251). The side positioning plate (312) is located on the side of the chassis (311) and is matched and connected with the positioning matching plate (252) and fixed by bolts. A drive wheel (313) is provided at the lower part of the chassis (311). The drive wheel (313) passes through the mounting groove (253) and contacts the annular scanning track (24). The drive wheel (313) is equipped with a dual-head drive motor (314). The chassis (311) is also provided with a ball bearing (315) at the bottom. The ball bearing (315) passes through the mounting groove (253) and contacts the annular scanning track (24). The ball bearing (315) is rotatably connected to the chassis (311). The upper surface of the chassis (311) of the scanning vehicle (31) is provided with a level mounting base. The level mounting base is a rectangular groove structure with a magnetic layer on its inner wall for adsorbing electronic level.

5. The ultrasonic phased array testing device for butt joints of thin-walled austenitic stainless steel pipes according to claim 4, characterized in that: The probe driving assembly (32) includes a cantilever bracket (321), which is fixedly connected to the chassis (311). A first electric push rod (322) is provided on the top side of the cantilever bracket (321). A crossbeam (323) is provided at the driving end of the first electric push rod (322). A second electric push rod (324) is provided on the upper part of the crossbeam (323). A guide hole is provided in the middle of the crossbeam (323). The second electric push rod (324) passes through the guide hole. The end of the second electric push rod (324) is provided with... A mounting plate (326) is provided, and a plurality of mounting holes (327) are provided at the bottom of the mounting plate (326). A probe constant pressure clamping assembly (33) is provided in the mounting holes (327). A second compression spring (325) is sleeved on the surface of the electric push rod between the guide hole and the mounting plate (326). The two ends of the second compression spring (325) are respectively connected to the mounting plate (326) and the output end of the second electric push rod (324). The second electric push rod (324) is connected to the mounting plate (326) through the second compression spring (325).

6. The ultrasonic phased array testing device for butt joints of thin-walled austenitic stainless steel pipes according to claim 5, characterized in that: The constant pressure clamping assembly (33) for the probe includes a threaded mounting part (331), which is threadedly connected to the mounting hole (327). A U-shaped bracket (332) is fixedly connected to the bottom of the threaded mounting part (331). A rotating part (333) is provided between the U-shaped brackets (332). A probe mounting part (334) is fixedly provided at the bottom of the rotating part (333). The probe mounting part (334) is rotatably connected to the U-shaped bracket (332) through the rotating part (333).

7. The ultrasonic phased array testing device for butt joints of thin-walled austenitic stainless steel pipes according to claim 6, characterized in that: The probe mounting component (334) is equipped with an ultrasonic phased array probe (337). The bottom of the probe mounting component (334) is provided with an inwardly concave arc-shaped contact surface that is consistent with the curvature of the outer diameter of the steel pipe, which is used to load the ultrasonic phased array probe (337) and ensure that it always points vertically to the center of the weld.

8. The ultrasonic phased array testing device for butt joints of thin-walled austenitic stainless steel pipes according to claim 7, characterized in that: The probe mounting component (334) has self-lubricating wear-resistant pads (335) on both sides of the concave arc-shaped contact surface. The pads are made of polytetrafluoroethylene and are used to reduce the frictional resistance when the probe slides on the steel pipe surface and prevent scratching the pipe wall. The bottom of the probe mounting component (334) is also provided with a coupling agent return groove (336) to discharge excess coupling agent.

9. The ultrasonic phased array testing device for butt joints of thin-walled austenitic stainless steel pipes according to claim 4, characterized in that: The coupling agent coating assembly (34) includes a coupling agent storage chamber (341) located on the upper surface of the chassis (311). A delivery pipe (342) is provided on the side of the coupling agent storage chamber (341), and a coupling agent nozzle (343) is provided at the end of the delivery pipe (342) away from the coupling agent storage chamber (341).

10. The ultrasonic phased array testing device for butt joints of thin-walled austenitic stainless steel pipes according to claim 1, characterized in that: The first semicircular arc plate (21) and the second semicircular arc plate (22) of the annular centering clamping mechanism (2) are provided with tongue and groove anti-misalignment structure on their mating end faces. When the quick-lock buckle (27) and quick-lock groove (28) are closed, the annular scanning track (24) surfaces of the two semicircular rings are smoothly mated, and the mating gap is less than 0.1mm.

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