Ultrasonic flaw detection device and method applied to weld joint of inner circle axial curved surface workpiece

Abstract

The invention discloses an ultrasonic flaw detection device and method applied to a weld joint of an inner circle axial curved surface workpiece, and relates to the technical field of ultrasonic flaw detection equipment.The ultrasonic flaw detection device comprises a flaw detection instrument, a connector, a flaw detection mechanism, a buckle mechanism, a mounting groove and a pipe, the flaw detection instrument is placed in the pipe, and the connector is arranged on one side of the flaw detection instrument; the connector is in linear connection with an external ultrasonic flaw detector, a mounting groove is formed in the flaw detector, a buckle mechanism in threaded transmission is arranged in the mounting groove, and the mounting groove is movably connected with a flaw detection mechanism through the buckle mechanism; an operator can rotate the knob to drive the first detection plate to rotate and limit the rotation range of the first detection plate so as to accurately adjust the first detection plate to a proper flaw detection angle, the second detection plate and the first detection plate cooperatively adjust the position and the angle through the rotating rod, and the second detection plate and the first detection plate are tightly attached to the pipe inner circle axial curved surface weld joint to ensure that ultrasonic waves are effectively transmitted into the pipe. Interface reflection and loss are reduced, and the flaw detection accuracy is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of ultrasonic flaw detection equipment, in particular to an ultrasonic flaw detection device and method for welding seams of inner circular axial curved surface workpieces. Background Art

[0002] In modern industrial production, the quality of the weld of the workpiece is directly related to the safety and reliability of the entire product. For example, in the manufacture of aircraft engines, if there are defects in the weld of the inner axial curved surface of the pipeline, it may cause the engine to malfunction during operation, seriously threatening flight safety; in oil pipelines, weld defects may cause leakage, causing environmental pollution and huge economic losses.

[0003] Traditional ultrasonic flaw detection technology has many limitations when facing inner cylindrical axial curved workpieces. On the one hand, it is difficult for conventional flaw detection devices to fit tightly to the inner cylindrical axial curved surface, resulting in inaccurate angles of ultrasonic emission and reception, and inability to effectively detect tiny defects deep in the weld. On the other hand, the existing equipment has insufficient adjustment flexibility and is difficult to adapt to inner cylindrical axial curved workpieces of different sizes and shapes, resulting in low flaw detection efficiency. Moreover, when different operators use the existing equipment, the flaw detection results vary greatly, lacking unified standards and comparability. Therefore, those skilled in the art provide an ultrasonic flaw detection device and method for welds of inner cylindrical axial curved workpieces to solve the problems raised in the above-mentioned background technology. Summary of the invention

[0004] The object of the present invention is to provide an ultrasonic flaw detection device and method for the weld of an inner cylindrical axial curved surface workpiece, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: An ultrasonic flaw detection device and method for welds of inner cylindrical axial curved surface workpieces, comprising a flaw detection instrument, a connector, a flaw detection mechanism, a snap mechanism, a mounting groove and a pipe, characterized in that a flaw detection instrument is placed inside the pipe, and a connector is provided on one side of the flaw detection instrument, the connector is linearly connected to an external ultrasonic flaw detector, a mounting groove is provided inside the flaw detection instrument, a snap mechanism with threaded transmission is provided in the mounting groove, and the mounting groove is movably connected to the flaw detection mechanism through the snap mechanism.

[0006] As a further solution of the present invention: the buckle mechanism includes a rotating wheel, a movable rod, an adjusting wheel, a threaded rod, an adjusting block, a guide frame, a limit frame, a fixed frame, a guide groove, a limit block, a limit seat and a limit groove, the fixed frame is symmetrically fixedly connected in the installation groove, the threaded rod is movably connected between the fixed frame and the installation groove, the adjusting wheel is fixedly connected below the threaded rod, and a movable rod is arranged on one side of the threaded rod, the movable rod is arranged with a rotating wheel, the rotating wheel and the adjusting wheel are meshed with each other, and the limit seats are symmetrically arranged in the installation groove.

[0007] As a further solution of the present invention: limiting grooves are provided on the two side surfaces of the limiting seat, and the limiting frames are slidably connected to the limiting grooves. A guide frame is arranged between the limiting frames on both sides, and a guide groove is provided on the side of the limiting frame close to the guide frame. The limiting frame is slidably connected to the guide frame through the guide groove, and an adjustment block is fixedly connected to one side of the guide frame. The interior of the adjustment block is a threaded structure, and the adjustment block is located on the threaded rod, and the threads between the threaded rod and the adjustment block cooperate with each other.

[0008] As a further solution of the present invention: the flaw detection mechanism includes a first detection plate, a rotating frame, a rotating rod, a fixed plate, a limit buckle, a rotating sleeve, a limit protrusion and a limit groove, a fixed plate is placed in the installation groove, a rotating frame is symmetrically arranged on the fixed plate, a rotating rod is movably connected to the rotating frame, the second detection plate is fixedly connected to the rotating rod, and the four corners below the fixed plate are fixedly connected to the limit buckles.

[0009] As a further solution of the present invention: a rotating sleeve is movably connected to one side of the rotating rod, and limiting protrusions are symmetrically arranged on the rotating sleeve, and a first probe plate is movably connected to the rotating rod, and a limiting groove is provided on one side of the first probe plate close to the protrusion, the limiting protrusion and the limiting groove cooperate with each other, and a knob is fixedly connected to one side of the rotating sleeve.

[0010] As a further solution of the present invention: the first detection plate and the second detection plate are matched in size, and the first detection plate and the second detection plate are in contact with the surface of the pipe.

[0011] A working method of an ultrasonic flaw detection device for a weld of an inner circular axial curved surface workpiece comprises the following steps: S1: According to the conditions of the test block or workpiece, use the knob to rotate the rotating sleeve, adjust the angle of the first probe plate through the cooperation of the limiting protrusion and the limiting groove, and at the same time, the rotating rod drives the second probe plate to move in coordination, so that the first probe plate and the second probe plate fit well with the surface of the pipe. By operating on the test block, it is ensured that when the workpiece is subsequently inspected, the ultrasonic wave can be transmitted into the workpiece in the correct direction and angle, thereby improving the accuracy of the inspection; S2: In the process of adjusting the position of the probe plate, the position of the probe plate is adjusted through the test block according to the feedback result of the test block; S3: Rotate the adjusting wheel to drive the threaded rod to rotate, and the adjusting block moves linearly through the thread transmission, thereby driving the guide frame and the limit frame to move. When the limit frame moves, the limit block and the limit buckle cooperate to fix the flaw detection mechanism in the installation slot; S4: Start the flaw detector and the external ultrasonic flaw detector. The ultrasonic probes inside the first and second probe plates emit ultrasonic waves into the pipe. When the ultrasonic waves propagate in the pipe and encounter weld defects, reflection and refraction occur. Part of the ultrasonic waves are reflected back to the probes. The probes convert the reflected waves into electrical signals and transmit them to the ultrasonic flaw detector. The flaw detector processes and analyzes the electrical signals and determines whether there are defects in the weld, as well as the location and size of the defects based on the time and amplitude of the reflected waves. S5: Record various data and results during the flaw detection process, including relevant information of defects, and generate a flaw detection report.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The operator can rotate the knob to drive the first probe plate to rotate and limit its rotation range, so that the first probe plate can be accurately adjusted to the appropriate flaw detection angle, and the second probe plate cooperates with the rotating rod. After the second probe plate and the first probe plate adjust their positions and angles in coordination, the two can fit tightly to the inner axial curved weld of the pipe. This precise fit ensures that the ultrasonic wave can be effectively transmitted into the pipe, reduces interface reflection and loss, greatly improves the accuracy of flaw detection, and can more accurately detect defects in the weld. Based on the good fit of the probe plates and the principle of ultrasonic flaw detection, the ultrasonic flaw detector can detect defects in the weld according to the time, The device can accurately judge whether there are defects in the weld, as well as the location and size of the defects by adjusting the angle and position of the probe plate, so that the first probe plate and the second probe plate can fit the welds of inner circumferential axial curved pipes of different specifications and shapes, adapting to the diversified industrial production needs and expanding the application scope of the device. The convenient and fast probe plate module switching function enables the device to quickly replace the appropriate probe plate module according to different flaw detection requirements, improving the flexibility and versatility of the device, and better meeting the complex and changeable flaw detection work scenes; 2. When it is necessary to switch different probe plate modules, the operator will turn the adjusting wheel. Since the adjusting wheel is fixedly connected to the threaded rod, the rotation of the adjusting wheel will drive the threaded rod to rotate synchronously. At the same time, the rotating wheel and the adjusting wheel are meshed with each other, and the rotation of the adjusting wheel will cause the rotating wheel to start rotating. When the threaded rod rotates, since the adjusting block has a threaded structure inside and cooperates with the thread of the threaded rod, according to the principle of threaded transmission, the rotational motion of the threaded rod will be converted into linear motion of the adjusting block, and the adjusting block will move along the axial direction of the threaded rod. The limit seat is symmetrically arranged in the installation groove, and the limit grooves on its two side surfaces are slidably connected to the limit frame, which limits the limit The movement trajectory of the frame can only move in a straight line along the direction of the limit groove, thereby preventing the limit frame from offsetting or shaking during movement. A guide groove is provided on the side of the limit frame close to the guide frame. The guide frame is slidably connected to the limit frame through the guide groove. The guide frame is fixedly connected to the adjustment block. When the adjustment block moves in a straight line driven by the threaded rod, the guide frame will also move accordingly. The guide groove provides further guiding effect for the movement of the guide frame, ensuring that the guide frame and other components connected thereto can move smoothly and accurately. When the limit frame moves to a suitable position, the limit block and the limit buckle cooperate with each other to fix or adjust the position of the flaw detection mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a schematic diagram of the structure of an ultrasonic flaw detection device for welds of inner cylindrical axial curved surface workpieces.

[0014] Figure 2 The present invention is a structural schematic diagram of a flaw detection mechanism used in an ultrasonic flaw detection device for welds of inner cylindrical axial curved surface workpieces.

[0015] Figure 3 The present invention is a schematic diagram of the cooperation between the first probe plate and the second probe plate in a flaw detection mechanism of an ultrasonic flaw detection device for a weld of an inner circular axial curved surface workpiece.

[0016] Figure 4 The present invention is a schematic diagram of the structure of a rotating sleeve in a flaw detection mechanism of an ultrasonic flaw detection device for welds of inner cylindrical axial curved surface workpieces.

[0017] Figure 5 The present invention is a schematic diagram of the cooperation between a rotating sleeve and a first probe plate in a flaw detection mechanism of an ultrasonic flaw detection device for a weld of an inner cylindrical axial curved surface workpiece.

[0018] Figure 6 The present invention is a structural schematic diagram of a snap mechanism used in an ultrasonic flaw detection device for welds of inner cylindrical axial curved surface workpieces.

[0019] Figure 7 The present invention is a schematic diagram of the cooperation between a limit seat and a limit frame in a snap mechanism of an ultrasonic flaw detection device for welds of inner cylindrical axial curved surface workpieces.

[0020] Figure 8 The present invention is a schematic diagram of the internal structure of a mounting groove in an ultrasonic flaw detection device for welds of inner circular axial curved surface workpieces.

[0021] Fig. 9 The present invention is a schematic diagram of the structure of a pipe used in an ultrasonic flaw detection device for welds of inner circular axial curved surface workpieces.

[0022] In the figure: 1. flaw detection instrument; 2. connector; 3. flaw detection mechanism; 301. first detection plate; 302. rotating frame; 303. rotating rod; 304. fixed plate; 305. limit buckle; 306. rotating sleeve; 307. limit convex block; 308. limit groove; 309. knob; 310. second detection plate; 4. buckle mechanism; 401. rotating wheel; 402. movable rod; 403. adjusting wheel; 404. threaded rod; 405. adjusting block; 406. guide frame; 407. limit frame; 408. fixed frame; 409. guide groove; 410. limit block; 411. limit seat; 412. limit groove; 5. installation groove; 6. pipe. DETAILED DESCRIPTION

[0023] 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.

[0024] Example 1

[0025] Reference Figure 1 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 This embodiment provides an ultrasonic flaw detection device for welds of inner cylindrical axial curved surface workpieces, comprising a flaw detection instrument 1, a connector 2, a flaw detection mechanism 3, a buckle mechanism 4, a mounting groove 5 and a pipe 6, characterized in that the flaw detection instrument 1 is placed inside the pipe 6, and a connector 2 is provided on one side of the flaw detection instrument 1, the connector 2 is linearly connected to an external ultrasonic flaw detector, a mounting groove 5 is provided inside the flaw detection instrument 1, a buckle mechanism 4 with a threaded drive is provided in the mounting groove 5, and the mounting groove 5 is movably connected to the flaw detection mechanism 3 through the buckle mechanism 4; In this embodiment, specifically, the buckle mechanism 4 includes a rotating wheel 401, a movable rod 402, an adjusting wheel 403, a threaded rod 404, an adjusting block 405, a guide frame 406, a limiting frame 407, a fixed frame 408, a guide groove 409, a limiting block 410, a limiting seat 411 and a limiting groove 412, the fixing frame 408 is symmetrically fixedly connected in the installation groove 5, the fixing frame 408 is movably connected with the threaded rod 404 between the installation groove 5, the adjusting wheel 403 is fixedly connected below the threaded rod 404, and a movable rod 402 is arranged on one side of the threaded rod 404, and a rotating wheel 401 is arranged on the movable rod 402, the rotating wheel 401 and the adjusting wheel 403 are meshed with each other, and the limiting seat 411 is symmetrically arranged in the installation groove 5; The limiting seat 411 has limiting grooves 412 on both sides thereof, and the limiting grooves 412 are slidably connected to the limiting frames 407. A guide frame 406 is arranged between the limiting frames 407 on both sides, and a guide groove 409 is arranged on one side of the limiting frame 407 close to the guide frame 406. The limiting frame 407 is slidably connected to the guide frame 406 through the guide groove 409. An adjusting block 405 is fixedly connected to one side of the guide frame 406. The adjusting block 405 has a threaded structure inside. The adjusting block 405 is located on the threaded rod 404, and the threads of the threaded rod 404 and the adjusting block 405 cooperate with each other. A limiting block 410 is provided on one side of the limiting frame 407 close to the limiting buckle 305, and the limiting block 410 cooperates with the limiting buckle 305; When it is necessary to switch different probe plate modules, the operator will rotate the adjusting wheel 403. Since the adjusting wheel 403 is fixedly connected to the threaded rod 404, the rotation of the adjusting wheel 403 will drive the threaded rod 404 to rotate synchronously. At the same time, the rotating wheel 401 and the adjusting wheel 403 are meshed with each other, and the rotation of the adjusting wheel 403 will cause the rotating wheel 401 to start rotating. When the threaded rod 404 rotates, since the adjusting block 405 has a threaded structure inside and cooperates with the thread of the threaded rod 404, according to the principle of thread transmission, the rotational motion of the threaded rod 404 will be converted into a linear motion of the adjusting block 405, and the adjusting block 405 will move along the axial direction of the threaded rod 404. The limit seat 411 is symmetrically arranged in the installation groove 5, and the limit grooves 412 on its two side surfaces are slidably connected to the limit frame 407, which limits the limit frame 4 07's movement trajectory allows it to only move in a straight line along the direction of the limit slot 412, thereby preventing the limit frame 407 from deflecting or shaking during movement. A guide slot 409 is provided on the side of the limit frame 407 close to the guide frame 406, and the guide frame 406 is slidably connected to the limit frame 407 through the guide slot 409. The guide frame 406 is fixedly connected to the adjustment block 405. When the adjustment block 405 moves in a straight line driven by the threaded rod 404, the guide frame 406 will also move accordingly. The guide slot 409 provides further guiding effect for the movement of the guide frame 406, ensuring that the guide frame 406 and other components connected thereto can move smoothly and accurately. When the limit frame 407 moves to a suitable position, the limit block 410 cooperates with the limit buckle 305 to achieve fixation or position adjustment of the flaw detection mechanism 3.

[0026] Example 2

[0027] Reference Figure 2-Figure 5 This embodiment is based on the previous embodiment, and is different from the previous embodiment in that the flaw detection mechanism 3 includes a first detection plate 301, a rotating frame 302, a rotating rod 303, a fixed plate 304, a limiting buckle 305, a rotating sleeve 306, a limiting protrusion 307 and a limiting groove 308, a fixed plate 304 is placed in the installation groove 5, a rotating frame 302 is symmetrically arranged on the fixed plate 304, a rotating frame 302 is movably connected to the rotating frame 302, a second detection plate 310 is fixedly connected to the rotating rod 303, and the limiting buckles 305 are fixedly connected to the four corners below the fixed plate 304; The rotating sleeve 306 is movably connected to one side of the rotating rod 303, and a limiting protrusion 307 is symmetrically arranged on the rotating sleeve 306. The first probe plate 301 is movably connected to the rotating rod 303, and a limiting groove 308 is provided on one side of the first probe plate 301 close to the protrusion. The limiting protrusion 307 and the limiting groove 308 cooperate with each other, and a knob 309 is fixedly connected to one side of the rotating sleeve 306; The first probe plate 301 and the second probe plate 310 are matched in size, and the first probe plate 301 and the second probe plate 310 are in contact with the surface of the tube 6; The operator drives the rotating sleeve 306 to rotate by rotating the knob 309. The limiting protrusion 307 on the rotating sleeve 306 cooperates with the limiting groove 308 on the first detection plate 301. When the rotating sleeve 306 rotates, the limiting protrusion 307 slides in the limiting groove 308, thereby driving the first detection plate 301 to rotate and limiting the rotation range of the first detection plate 301 to avoid excessive rotation, ensuring that the first detection plate 301 can be accurately adjusted to a suitable flaw detection angle. Next, the second probe plate 310 moves synchronously with the rotating rod 303 when the rotating rod 303 rotates, and adjusts the position and angle in coordination with the first probe plate 301. After the angle and position are adjusted, the first probe plate 301 and the second probe plate 310 are matched in size and can be tightly fitted at the inner axial curved weld of the pipe 6. This fit ensures that the ultrasonic wave can be effectively transmitted from the probe plate to the inside of the pipe, reducing the reflection and loss of the ultrasonic wave at the interface, and improving the accuracy of flaw detection. Principle of ultrasonic flaw detection: Ultrasonic probes are usually installed inside the first probe plate 301 and the second probe plate 310. During flaw detection, the probe emits ultrasonic waves into the inside of the pipe. The ultrasonic waves propagate in the pipe. When encountering defects in the weld, the ultrasonic waves will be reflected, refracted, etc., and part of the ultrasonic waves will be reflected back to the probe. After receiving the reflected wave, the probe converts it into an electrical signal and transmits it to the ultrasonic flaw detector. The ultrasonic flaw detector processes and analyzes the received electrical signal, and judges whether there are defects in the weld, as well as the location and size of the defects based on the time, amplitude and other parameters of the reflected wave.

[0028] Example 3

[0029] Reference Figure 1-Figure 7 This embodiment is based on the previous embodiment, and is different from the previous embodiment in that a working method of an ultrasonic flaw detection device for a weld of an inner circular axial curved surface workpiece comprises the following steps: S1: According to the conditions of the test block or the workpiece, the knob 309 is used to rotate the rotating sleeve 306, and the angle of the first probe plate 301 is adjusted through the cooperation between the limiting protrusion 307 and the limiting groove 308. At the same time, the rotating rod 303 drives the second probe plate 310 to move in coordination, so that the first probe plate 301 and the second probe plate 310 are well fitted with the surface of the pipe 6. By operating on the test block, it is ensured that when the workpiece is subsequently inspected, the ultrasonic wave can be transmitted into the workpiece in the correct direction and angle, thereby improving the accuracy of the inspection; S2: In the process of adjusting the position of the probe plate, the position of the probe plate is adjusted through the test block according to the feedback result of the test block; S3: Rotate the adjusting wheel 403 to drive the threaded rod 404 to rotate, and the adjusting block 405 moves linearly through the thread transmission, thereby driving the guide frame 406 and the limit frame 407 to move. When the limit frame 407 moves, the limit block 410 cooperates with the limit buckle 305 to fix the flaw detection mechanism 3 in the installation groove 5; S4: Start the flaw detector 1 and the external ultrasonic flaw detector. The ultrasonic probes inside the first probe plate 301 and the second probe plate 310 emit ultrasonic waves into the pipe 6. When the ultrasonic waves propagate in the pipe 6 and encounter weld defects, reflection and refraction will occur. Part of the ultrasonic waves will be reflected back to the probes. The probes will convert the reflected waves into electrical signals and transmit them to the ultrasonic flaw detector. The flaw detector processes and analyzes the electrical signals and determines whether there are defects in the weld, as well as the location and size of the defects based on the time and amplitude of the reflected waves. S5: Record various data and results during the flaw detection process, including relevant information of defects, and generate a flaw detection report.

[0030] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0031] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An ultrasonic flaw detection device for welds of inner cylindrical axial curved surface workpieces, comprising a flaw detection instrument (1), a connector (2), a flaw detection mechanism (3), a buckle mechanism (4), a mounting groove (5) and a pipe (6), characterized in that: A flaw detector (1) is placed inside the pipe (6), and a connector (2) is provided on one side of the flaw detector (1), the connector (2) being linearly connected to an external ultrasonic flaw detector, a mounting groove (5) is provided inside the flaw detector (1), a threaded buckle mechanism (4) is provided inside the mounting groove (5), and the mounting groove (5) is movably connected to the flaw detector mechanism (3) via the buckle mechanism (4).

2. The ultrasonic flaw detection device for welds of inner cylindrical axial curved workpieces according to claim 1 is characterized in that: The buckle mechanism (4) comprises a rotating wheel (401), a movable rod (402), an adjusting wheel (403), a threaded rod (404), an adjusting block (405), a guide frame (406), a limiting frame (407), a fixed frame (408), a guide groove (409), a limiting block (410), a limiting seat (411) and a limiting groove (412); the fixing frame (408) is symmetrically fixedly connected in the installation groove (5); the threaded rod (404) is movably connected between the fixing frame (408) and the installation groove (5); the adjusting wheel (403) is fixedly connected below the threaded rod (404); a movable rod (402) is arranged on one side of the threaded rod (404); a rotating wheel (401) is arranged on the movable rod (402); the rotating wheel (401) and the adjusting wheel (403) are meshed with each other; and the limiting seat (411) is symmetrically arranged in the installation groove (5).

3. The ultrasonic flaw detection device for welds of inner cylindrical axial curved workpieces according to claim 2 is characterized in that: The limiting seat (411) has limiting grooves (412) on both sides thereof, and the limiting grooves (412) are slidably connected to the limiting frames (407). A guide frame (406) is arranged between the limiting frames (407) on both sides, and a guide groove (409) is arranged on a side of the limiting frame (407) close to the guide frame (406). The limiting frame (407) is slidably connected to the guide frame (406) via the guide groove (409). An adjusting block (405) is fixedly connected to one side of the guide frame (406). The adjusting block (405) has a threaded structure inside. The adjusting block (405) is located on the threaded rod (404), and the threads of the threaded rod (404) and the adjusting block (405) cooperate with each other.

4. The ultrasonic flaw detection device for welds of inner cylindrical axial curved surface workpieces according to claim 1 is characterized in that: The flaw detection mechanism (3) comprises a first detection plate (301), a rotating frame (302), a rotating rod (303), a fixed plate (304), a limiting buckle (305), a rotating sleeve (306), a limiting protrusion (307) and a limiting groove (308); the fixed plate (304) is placed in the installation groove (5); the rotating frame (302) is symmetrically arranged on the fixed plate (304); the rotating frame (302) is movably connected to the rotating rod (303); the rotating rod (303) is fixedly connected to the second detection plate (310); and the limiting buckles (305) are fixedly connected to the four corners below the fixed plate (304).

5. The ultrasonic flaw detection device for welds of inner cylindrical axial curved surface workpieces according to claim 4 is characterized in that: A rotating sleeve (306) is movably connected to one side of the rotating rod (303), a limiting protrusion (307) is symmetrically arranged on the rotating sleeve (306), and a first detection plate (301) is movably connected to the rotating rod (303), a limiting groove (308) is provided on a side of the first detection plate (301) close to the protrusion, the limiting protrusion (307) and the limiting groove (308) cooperate with each other, and a knob (309) is fixedly connected to one side of the rotating sleeve (306).

6. The ultrasonic flaw detection device for welds of inner cylindrical axial curved surface workpieces according to claim 5 is characterized in that: The first detection plate (301) and the second detection plate (310) are matched in size, and the first detection plate (301) and the second detection plate (310) are in contact with the surface of the pipe (6).

7. The ultrasonic flaw detection device for welds of inner cylindrical axial curved workpieces according to claim 3 is characterized in that: A limiting block (410) is provided on one side of the limiting frame (407) close to the limiting buckle (305), and the limiting block (410) and the limiting buckle (305) cooperate with each other.

8. A working method for an ultrasonic flaw detection device for welds of inner cylindrical axial curved surface workpieces as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: S1: According to the condition of the test block or the workpiece, the rotating sleeve (306) is rotated by using the knob (309), and the angle of the first probe plate (301) is adjusted by the cooperation between the limiting protrusion (307) and the limiting groove (308). At the same time, the rotating rod (303) drives the second probe plate (310) to move in coordination, so that the first probe plate (301) and the second probe plate (310) are well fitted with the surface of the pipe (6). By operating on the test block, it is ensured that when the workpiece is subsequently tested for flaws, the ultrasonic wave can be transmitted into the workpiece in the correct direction and angle, thereby improving the accuracy of flaw detection; S2: In the process of adjusting the position of the probe plate, the position of the probe plate is adjusted through the test block according to the feedback result of the test block; S3: rotating the adjusting wheel (403) to drive the threaded rod (404) to rotate, and the adjusting block (405) to move linearly through the threaded transmission, thereby driving the guide frame (406) and the limit frame (407) to move. When the limit frame (407) moves, the limit block (410) cooperates with the limit buckle (305) to fix the flaw detection mechanism (3) in the installation groove (5); S4: starting the flaw detector (1) and the external ultrasonic flaw detector, and the ultrasonic probes inside the first probe plate (301) and the second probe plate (310) emit ultrasonic waves into the pipe (6). When the ultrasonic waves propagate in the pipe (6) and encounter weld defects, reflection and refraction occur, and part of the ultrasonic waves are reflected back to the probes. The probes convert the reflected waves into electrical signals and transmit them to the ultrasonic flaw detector. The flaw detector processes and analyzes the electrical signals, and determines whether there are defects in the weld, as well as the location and size of the defects based on the time and amplitude of the reflected waves. S5: Record various data and results during the flaw detection process, including relevant information of defects, and generate a flaw detection report.

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