Metal joint welding seam ultrasonic inspection equipment

Abstract

The application relates to the technical field of weld flaw detection, in particular to a metal piece connecting portion weld ultrasonic flaw detection equipment, which comprises a guide rail, the guide rail is detachably installed on a pipeline, a driving device is arranged on the guide rail, the driving device comprises a shell one, driving rollers one and two are rotationally connected to the shell one, the driving rollers one and two are in contact with the guide rail, a motor is fixedly connected to the shell one, the motor output end is coaxially connected with the driving roller one, and a scanning probe is arranged on the shell one. The detachable guide rail is closely attached to the pipeline, the driving device drives the driving rollers to move along the guide rail by the motor, and the scanning probe is driven to surround the weld for scanning, which avoids detection difficulty caused by the large pipeline or terrain limitation, improves the flaw detection efficiency, the scanning probe moves synchronously with the driving device, the weld is always aligned, the detection accuracy and stability are improved, the labor intensity is reduced, and the operation convenience and safety are improved.

Description

Technical Field

[0001] This invention relates to the field of weld flaw detection technology, specifically to an ultrasonic flaw detection device for welds at metal joints. Background Technology

[0002] For pressure pipelines transporting highly hazardous media such as toxic, flammable, and explosive materials, non-destructive testing (NDT) is mandatory for their welds, according to relevant standards such as the "Safety Technical Supervision Regulations for Pressure Pipelines" and the "Construction Quality Acceptance Specifications for Industrial Metal Pipeline Engineering." This is especially true for welds at on-site joints, where 100% NDT is often required due to the complex construction environment and stress concentration. Conventional NDT methods involve scanning the welds using a loose-controlled scanning probe equipped with an ultrasonic sensor. In the factory prefabrication stage, large pipelines can be easily scanned using specialized flipping equipment. However, after underground installation, the welds at joints are restricted by terrain and the large size of the pipeline makes flipping impossible. Furthermore, the overall length of the pipeline and the number of welds make operation difficult and continuous looping impossible, resulting in extremely challenging on-site NDT operations and significantly reduced testing efficiency.

[0003] To address the aforementioned issues, existing technologies have provided some solutions. For example, patent application number CN202222721531.2 provides a pipe weld flaw detection device. This design can clamp and fix the pipe to be tested through a clamping mechanism, thereby enabling repeated detection of the welds on the pipe. However, this design is large in size, cumbersome to install, and difficult to adapt to underground construction environments. Furthermore, this design can only detect flaws in pipes of specific sizes and cannot adapt to pipes of different sizes, resulting in poor adaptability. Summary of the Invention

[0004] The purpose of this invention is to provide an ultrasonic flaw detection device for weld seams at metal joints, so as to solve the problems of high difficulty and low efficiency in weld seam flaw detection after underground pipeline installation.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] An ultrasonic flaw detection device for weld seams at metal joints includes a guide rail, which is detachably mounted on a pipe. The guide rail is an integral flexible metal strip. A locking component is provided on the guide rail to fix it to the pipe. A driving device is provided on the guide rail. The driving device includes a housing, on which a first driving roller and a second driving roller are rotatably connected. Both the first and second driving rollers are in contact with the guide rail. A motor is fixedly connected to the housing, and the output end of the motor is coaxially connected to the driving rollers. A scanning probe is provided on the housing. The driving device drives the scanning probe to move along the guide rail and simultaneously drives the scanning probe to reciprocate along the pipe axis.

[0007] This design achieves a tight fit between the guide rail and the pipe by detachably mounting the guide rail. The drive unit contacts the guide rail via drive rollers one and two. Driven by a motor, drive roller one rotates, moving the entire drive unit along the guide rail. This allows the scanning probe to move and detect along the weld seam on the pipe, enabling stable and continuous circumferential scanning of the weld seam. This avoids detection interruptions caused by the large size of the pipe or terrain limitations, effectively improving the efficiency of on-site flaw detection. Simultaneously, the scanning probe, mounted on the outer casing, moves synchronously with the drive unit. The movement of the drive unit is restricted by the guide rail, ensuring it remains aligned with the weld seam throughout the movement, guaranteeing the accuracy and reliability of the detection, and also avoiding... This design eliminates the shaking that can occur when manually holding the probe for extended periods, further improving the stability of the detection data. Therefore, when scanning pipe welds, operators only need to install the guide rail and start the motor; the scanning probe will then automatically scan the weld around the pipe. This frees up manpower, eliminating the need for prolonged hand-held operation, reducing labor intensity, and improving the convenience and safety of the operation. Furthermore, the design uses an integrated flexible metal strip as the guide rail, resulting in a simple, lightweight structure that is easy to carry and install, adaptable to confined spaces. The integrated flexible metal strip guide rail can also bend adaptably to pipes of different diameters, making it highly adaptable to pipes of any size.

[0008] Preferably, a first drive gear is coaxially fixedly connected to the first drive roller, a second drive gear is rotatably connected to the first housing, the first drive gear meshes with the second drive gear, a third drive gear is coaxially fixedly connected to the second drive gear, the third drive gear is an incomplete gear, the central angle corresponding to the teeth of the third drive gear is less than 90°, a sliding clamp is slidably connected to the first housing, two drive racks are fixedly connected to the sliding clamp, the two drive racks are respectively located on both sides of the third drive gear, and both drive racks mesh with the third drive gear, and the scanning probe is connected to the sliding clamp.

[0009] This design fixes the first drive gear and the first drive roller coaxially. When the first drive roller rotates, it drives the entire drive unit to move along the guide rail. The first drive gear rotates synchronously and drives the second drive gear meshing with it, which in turn drives the third drive gear on the same axis to rotate. Since the third drive gear is an incomplete gear, its teeth alternately mesh with the drive racks on both sides of the sliding clamp during rotation. When the teeth of the third drive gear contact one side of the drive rack, it pushes the sliding clamp to move in one direction along the sliding guide rail on the outer shell. When the teeth rotate to the other side and contact another drive rack, it pulls the sliding clamp to move in the opposite direction. This design allows the scanning probe to move in the same direction as the drive unit. While moving in a circular motion along the guide rail, the probe can also reciprocate linearly along the pipe axis under the drive of the sliding clamp. This greatly increases the scanning coverage density of the probe and the weld area, enabling more comprehensive detection of defects at different locations and depths in the weld. It effectively avoids the problem of missed detection that may occur due to scanning in a single direction, significantly improving the precision and accuracy of flaw detection. Furthermore, this design allows the drive device to drive the scanning probe to move along the guide rail and simultaneously drive the scanning probe to reciprocate along the pipe axis. The combined motion of the probe can be achieved without an additional power source. The structure is compact and has high energy utilization efficiency, reducing the overall complexity and manufacturing cost of the equipment.

[0010] Preferably, the guide rail includes a fixing part and a guiding part, the fixing part is in contact with the pipe, the guiding part has a gap with the surface of the pipe, and the first driving roller and the second driving roller are respectively located on both sides of the guiding part and in contact with the guiding part.

[0011] This design uses an integrated flexible metal strip as a guide rail. Since the metal strip adheres tightly to the pipe surface after installation, drive rollers one and two cannot be positioned on the guide rail. Therefore, the design divides the guide rail into a fixed part and a guiding part. A gap exists between the guiding part and the pipe surface, forming a ring-shaped guide rail that is higher than the pipe surface. Drive rollers one and two are clamped onto the guiding part, and positioning and movement are achieved using the guiding part. This design, through its simple structure, not only positions the drive device but also retains the simple and portable characteristics of a guide rail structure. Furthermore, this design ensures that the drive device does not directly contact the pipe surface during movement and avoids the impact of potential unevenness on the pipe surface on the movement accuracy of the drive device.

[0012] Preferably, the locking assembly includes a second housing, which is fixedly connected to one end of a guide rail. The second housing has a connection hole with the same shape as the guide rail. A reinforcing rod is rotatably connected to the second housing, and a reinforcing gear is coaxially fixedly connected to the reinforcing rod. A reinforcing rack is provided on the fixing part, and the reinforcing gear meshes with the reinforcing rack. A ratchet is elastically connected inside the second housing, and the ratchet faces the side away from the first housing. An unlocking groove is provided on the ratchet. An unlocking rod is threadedly connected to the second housing, and a triangular block is rotatably connected to one end of the unlocking rod. The inclined surface of the triangular block is located on the side of the triangular block away from the guide rail, and the triangular block cooperates with the inner wall of the unlocking groove.

[0013] This design involves fixing one end of the outer casing to one end of the guide rail, while the other end of the guide rail can be inserted into the connecting hole of the outer casing to achieve docking. When it is necessary to fix the guide rail, rotating the reinforcing rod drives the coaxial reinforcing gear to rotate. Since the reinforcing gear meshes with the reinforcing rack on the fixing part, rotating the reinforcing rod can drive the guide rail to move within the connecting hole, thereby adjusting the tightness of the guide rail and ensuring that the guide rail fits tightly against the pipe. The ratchet teeth of the elastic connection inside the outer casing face away from the outer casing. When the guide rail is tightened, the ratchet teeth, under the action of elastic force, engage with the grooves of the reinforcing rack, preventing the reinforcing gear from rotating in the opposite direction and achieving one-way locking. To ensure the guide rail remains secure during operation, when disassembly is required, rotate the unlocking lever. Since the unlocking lever is threaded into the housing, its rotation causes a triangular block at one end to move axially. The inclined surface of the triangular block engages with the inner wall of the unlocking groove on the ratchet. As the triangular block advances, the inclined surface presses against the unlocking groove, forcing the ratchet to overcome elastic force and move away from the reinforcing rack, thus releasing the lock on the reinforcing gear and enabling convenient disassembly. This locking structure is simple to operate, provides a secure lock, and can accommodate minor adjustments caused by pipe deformation, ensuring reliable installation and easy disassembly of the guide rail.

[0014] Preferably, a U-shaped block is rotatably connected to the outer shell, the U-shaped block encloses the reinforcing gear, contact racks are provided on both sides of the inner wall of the U-shaped block, and magnets are hinged to both sides of the U-shaped block, the magnets being in contact with the pipe.

[0015] When installing the guide rail, the outer casing 2 needs to be aligned with the pipe before rotating the reinforcing rod to tighten the guide rail. However, the guide rail may shift due to vibration during the rotation of the reinforcing rod or improper operation, thus affecting the subsequent scanning and flaw detection by the scanning probe. Therefore, this design incorporates a U-shaped block on the outer casing 2. Before installing the guide rail, the outer casing 2 is aligned with the pipe, and the magnets on both sides of the U-shaped block are attached to the pipe, fixing the U-shaped block to the pipe. When the reinforcing rod is rotated to tighten the guide rail, if the guide rail shifts, the outer casing 2 will rotate. Since the U-shaped block is fixed to the pipe, its rotation will not cause it to move. Furthermore, the contact racks on both sides of the inner wall of the U-shaped block will contact the reinforcing gears when the outer casing 2 rotates. This restricts the rotation of the reinforcing gear. At this point, the operator needs to adjust the angle of the outer casing two to realign it with the pipe axis. Once the angle of the outer casing two is correctly adjusted, the contact rack disengages from the reinforcing gear, and the operator can continue to rotate the reinforcing rod to tighten the guide rail until the guide rail is completely tightened and fits against the pipe surface. This design ensures that the operator is always reminded to keep the outer casing two aligned with the pipe axis during the guide rail tightening process, effectively preventing the drive device's trajectory from deviating from the weld seam due to guide rail misalignment. This ensures that the scanning probe can accurately align with the weld seam area, improving the accuracy of flaw detection. The magnetic attraction of the first magnet can also provide temporary fixation for the outer casing two in the early stages of installation, making it convenient for the operator to operate the reinforcing rod with one hand to tighten the guide rail, significantly improving installation efficiency.

[0016] Preferably, a slider is elastically slidably connected to the second outer shell, a pulley is provided on the slider, the pulley contacts the pipe, and an extrusion slope is provided on the unlocking rod, the extrusion slope contacts the slider.

[0017] This design features a slider that slides elastically on the outer casing. After a scan is completed, the operator can unlock the device using an unlocking rod. Since the unlocking rod is threaded onto the outer casing, its rotation causes a triangular block at one end to move axially. The inclined surface of the triangular block engages with the inner wall of the unlocking groove on the ratchet. As the triangular block advances, the inclined surface presses against the unlocking groove, forcing the ratchet to overcome its elastic force and move away from the reinforcing gear, thus releasing the lock on the reinforcing gear. During the unlocking rod's movement, the pressing inclined surface pushes the slider out, causing the pulley on the slider to contact the pipe and lift both outer casings. The operator can then directly drag the outer casing to move the guide rail along the pipe to the next weld without completely disassembling the guide rail. This significantly saves time and effort associated with repeated disassembly and reassembly, making it particularly suitable for scenarios where multiple welds on the pipe require continuous flaw detection. Furthermore, the pulley lifting the outer casings prevents the scanning probe surface from contacting and rubbing against unpolished areas of the pipe while dragging the guide rail, effectively protecting the probe's detection surface from scratches or wear and extending its lifespan.

[0018] Preferably, a magnet is provided at one end of the fixing part, a connecting block is elastically slidably connected inside the outer shell, and the driving roller is rotatably connected to the connecting block.

[0019] This design incorporates a magnet at one end of the fixing part. After the guide rail is installed, the guide rail on one side passing through the connecting hole will be fixed to the guide rail on the other side by the magnet. At this time, there will be an overlapping area between the guide rails, which can greatly reduce the length of the guide rail after installation, further improving the ease of installation in confined spaces and avoiding the problem of difficult operation in narrow environments due to excessively long guide rails. At the same time, the connecting block with elastic sliding connection inside the outer shell allows the drive roller to always be tightly attached to the guide part of the guide rail under the action of elastic force. Even if the guide rail has local undulations due to minor deformation of the pipe or installation errors, the elastic expansion and contraction of the connecting block can adaptively adjust the position of the drive roller, ensuring that the movement trajectory of the drive device remains stable, thereby ensuring that the detection accuracy of the scanning probe is not affected.

[0020] Preferably, the outer casing is provided with a guide roller 1, which is inclined to the side where the guide rail is located and contacts the pipe. The outer casing is also provided with a guide roller 2, which contacts the edge of the guide section.

[0021] This design incorporates a guide roller 1 on the outer casing, tilted towards the guide rail. This ensures that as the outer casing moves along the guide section, the tilted guide roller 1 consistently applies a force towards the guide rail. Simultaneously, a second guide roller 2 is also provided on the outer casing, resting against the edge of the guide section. This effectively limits the axial displacement of the drive device along the pipe, preventing it from deviating from the circular trajectory of the weld during movement. The synergistic effect of the drive roller 1 and the guide roller 2 ensures that the scanning probe is always precisely aligned with the weld area, further enhancing the stability and accuracy of flaw detection.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0023] 1. This invention uses a detachable guide rail that fits snugly against the pipe. The drive device is driven by a motor to move the rollers along the guide rail, which in turn drives the scanning probe to perform a circumferential scan of the weld. This avoids the detection difficulties caused by the large size of the pipe or the terrain limitations, and improves the flaw detection efficiency. The scanning probe moves synchronously with the drive device to ensure that it is always aligned with the weld, thereby improving the detection accuracy and stability. The design frees up manpower, eliminating the need for long-term hand operation, reducing labor intensity, and improving the convenience and safety of operation.

[0024] 2. By fixing the drive gear one and the drive roller one coaxially, this invention allows the scanning probe to move in a circular motion along the guide rail with the drive device, while also reciprocating linearly along the pipe axis under the drive of the sliding clamp. This greatly increases the scanning coverage density of the probe and the weld area, enabling more comprehensive detection of defects at different locations and depths in the weld. It effectively avoids the problem of missed detection that may occur due to scanning in a single direction, and significantly improves the precision and accuracy of flaw detection.

[0025] 3. This invention uses an integrated flexible metal strip as a guide rail, which can adapt to the bending of pipes of different diameters and fit the surface, solving the problem of adapting to pipes of multiple sizes. The guide rail fixing part contacts the pipe to provide a stable foundation, and the guiding part forms an annular guide rail higher than the pipe, so that the drive roller of the drive device does not directly contact the pipe, avoiding unevenness from affecting the movement accuracy. The locking component connects and tensions both ends of the guide rail. Even if the pipe deforms, the flexible guide rail can adjust to maintain a close fit, ensuring that the movement trajectory of the drive device accurately corresponds to the weld seam and improving the stability of the scanning probe. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the front structure of the ultrasonic flaw detection device for the weld seam at the metal component connection of the present invention.

[0027] Figure 2 This is a schematic diagram of the rear structure of the ultrasonic flaw detection device for the weld seam at the metal component connection of the present invention.

[0028] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0029] Figure 4 for Figure 2 Enlarged view at point B in the middle;

[0030] Figure 5 This is a partial sectional view of the outer shell.

[0031] Figure 6 This is a sectional view of the outer shell along the line of symmetry.

[0032] Figure 7 This is a schematic diagram of the structure of the driving device of the present invention;

[0033] Figure 8 This is a bottom view of the drive device of the present invention;

[0034] Figure 9 This is a cross-sectional view of the driving device of the present invention along the line of symmetry;

[0035] Figure 10 for Figure 9 A bottom view;

[0036] Figure 11 for Figure 1A schematic diagram of the structure after the pipes have been removed.

[0037] In the diagram: 1. Guide rail; 2. Housing 1; 3. Drive roller 1; 4. Drive roller 2; 5. Motor; 6. Scanning probe; 7. Drive gear 1; 8. Drive gear 2; 9. Drive gear 3; 10. Drive rack; 11. Fixing part; 12. Guide part; 13. Housing 2; 14. Connecting hole; 15. Reinforcing rod; 16. Reinforcing gear; 17. Reinforcing rack; 18. Ratchet; 19. Unlocking groove; 20. Unlocking rod; 21. Triangular block; 22. U-shaped block; 23. Contact rack; 24. Magnet 1; 25. Slider; 26. Pulley; 27. Extrusion ramp; 28. Magnet 2; 29. ​​Connecting block; 30. Guide roller 1; 31. Guide roller 2; 32. Sliding clamp; 33. Pipe. Detailed Implementation

[0038] This invention provides an ultrasonic flaw detection device for weld seams at metal component joints, the technical solution of which is as follows:

[0039] Please see Figures 1 to 11 An ultrasonic flaw detection device for weld seams at metal joints includes a guide rail 1, which is an integral flexible metal strip. The guide rail 1 is detachably mounted on a pipe 33. A driving device and a locking assembly are provided on the guide rail 1 to fix the guide rail 1 to the pipe 33. The driving device includes a housing 2, on which drive rollers 3 and 4 are rotatably connected. Both drive rollers 3 and 4 are in contact with the guide rail. A motor 5 is fixedly connected to the housing 2, and the output end of the motor 5 is coaxially connected to drive roller 3. A scanning probe 6 is provided on the housing 2, and an ultrasonic sensor is installed inside the scanning probe 6. The ultrasonic sensor is used to emit ultrasonic waves and receive the reflected echoes from the defect. By analyzing the time and amplitude of the echoes, the device can detect defects. To determine the location and size of the defect, the drive device drives the scanning probe 6 to move along the guide rail and simultaneously drives the scanning probe 6 to reciprocate along the axis of the pipe 33. A drive gear 7 is coaxially fixedly connected to the drive roller 3, and a drive gear 8 is rotatably connected to the outer casing 2. The drive gear 7 meshes with the drive gear 8. A drive gear 9 is coaxially fixedly connected to the drive gear 8. The drive gear 9 is an incomplete gear, and the central angle corresponding to the teeth of the drive gear 9 is 60°. A sliding clamp 32 is slidably connected to the outer casing 2. Two drive racks 10 are fixedly connected to the sliding clamp 32. The two drive racks 10 are located on both sides of the drive gear 9, and both drive racks 10 mesh with the drive gear 9. The scanning probe 6 is connected to the sliding clamp 32.

[0040] Please see Figures 1 to 11The guide rail 1 includes a fixing part 11 and a guiding part 12. The fixing part 11 contacts the pipe 33, and there is a gap between the guiding part 12 and the surface of the pipe 33. The first driving roller 3 and the second driving roller 4 are located on both sides of the guiding part 12 and contact the guiding part 12. The locking assembly includes a second housing 13, which is fixedly connected to one end of the guide rail 1. The second housing 13 has a connecting hole 14 with the same shape as the guide rail 1. A reinforcing rod 15 is rotatably connected to the second housing 13, and the reinforcing rod 15 is coaxially fixed. A reinforcing gear 16 is connected, and a reinforcing rack 17 is provided on the fixing part 11. The reinforcing gear 16 meshes with the reinforcing rack 17. A ratchet 18 is elastically connected inside the outer shell 2. The ratchet 18 faces away from the outer shell 2. An unlocking groove 19 is provided on the ratchet 18. An unlocking rod 20 is threadedly connected to the outer shell 23. A triangular block 21 is rotatably connected to one end of the unlocking rod 20. The inclined surface on the triangular block 21 is located on the side of the triangular block 21 away from the guide rail 1. The triangular block 21 cooperates with the inner wall of the unlocking groove 19.

[0041] Please see Figures 1 to 11 A U-shaped block 22 is rotatably connected to the outer shell 13, which encloses the reinforcing gear 16. Contact racks 23 are provided on both sides of the inner wall of the U-shaped block 22. Magnets 24 are hinged to both sides of the U-shaped block 22 and contact the pipe 33. A slider 25 is elastically slidably connected to the outer shell 13. A pulley 26 is provided on the slider 25 and contacts the pipe 33. An extrusion slope 27 is provided on the unlocking rod 20 and contacts the slider 25. A magnet 28 is provided at one end of the fixing part 11. A connecting block 29 is elastically slidably connected inside the outer shell 2. A drive roller 4 is rotatably connected to the connecting block 29. A guide roller 30 is provided on the outer shell 2. The guide roller 30 is inclined to the side where the guide rail 1 is located and contacts the pipe 33. A guide roller 31 is provided on the outer shell 2 and contacts the edge of the guide part 12.

[0042] Please see Figures 1 to 11 The working process of an ultrasonic flaw detection device for weld seams at metal component joints;

[0043] I. Installation Preparation;

[0044] The guide rail 1 is a one-piece flexible metal strip that can be bent to adapt to pipes 33 of different diameters. The guide rail 1 is placed around the predetermined position of the weld to be inspected on the pipe 33. The fixing part 11 of the guide rail 1 fits against the surface of the pipe 33, while the guiding part 12 forms an annular guide rail higher than the surface of the pipe 33. One end of the guide rail 1 is inserted into the connecting hole 14 on the outer casing 13 fixed to its other end. At this time, the magnet 28 will attract the other side of the guide rail 1, achieving initial fixation and reducing the closed length of the guide rail 1, facilitating operation in confined spaces. Then, the operator rotates the reinforcing rod 15, which drives the coaxial reinforcing gear 16 to rotate. Since the reinforcing gear 16 meshes with the reinforcing rack 17 provided on the fixing part 11 of the guide rail 1, the rotation of the gear pulls the guide rail 1 to move within the connecting hole 14, thereby tightening the guide rail 1 and making it fit tightly against the pipe 33. 3. During the tightening process, the ratchet 18 inside the outer casing 13 will engage with the tooth groove of the reinforcing rack 17 under the action of elastic force, preventing the reinforcing gear 16 from rotating in the opposite direction and achieving one-way locking. This ensures that the guide rail 1 will not loosen during operation. While rotating the reinforcing rod 15, the magnets 24 on both sides of the U-shaped block 22 are attached to the pipe 33, providing temporary fixation for the outer casing 13. If the guide rail 1 deflects during the tightening process, it will cause the outer casing 13 to rotate together. At this time, the contact racks 23 on both sides of the inner wall of the U-shaped block 22 will contact the reinforcing gear 16, restricting its continued rotation. This reminds the operator that the outer casing 13 is not aligned with the axis of the pipe 33. The operator needs to adjust the angle of the outer casing 13 until it is correct. At this time, the contact racks 23 will disengage from the reinforcing gear 16, and the reinforcing rod 15 can be rotated to complete the precise installation of the guide rail 1.

[0045] II. Start the scan;

[0046] After the guide rail 1 is installed, the drive device is placed on the guide rail 1, and the motor 5 fixed on the outer shell 2 is started. The output end of the motor 5 is coaxially connected to the drive roller 3, which drives the drive roller 3 to rotate. The drive roller 3 rolls on the guide part 12, which drives the entire drive device to make a circular motion around the pipe 33 along the guide rail 1. At the same time, the drive gear 7 on the drive roller 3 rotates synchronously, driving the drive gear 8 meshing with it to rotate. The drive gear 8 drives the coaxial drive gear 9 to rotate. When the gear teeth of the drive gear 9 rotate to one side, they will mesh with one drive rack 10 on the sliding clamp 32, pushing the sliding clamp 32 to move in one direction. When the gear teeth rotate to the other side, they will mesh with another drive rack 10, pushing the sliding clamp 32 to move in the opposite direction. The sliding clamp 32 slides back and forth on the outer shell 2. The scanning probe 6 is connected to the sliding clamp 32. Therefore, the scanning probe 6 itself is still making reciprocating linear motion along the axial direction of the pipe 33. During the entire movement, the guide roller 1 30 always presses the drive device against the guide rail 1, while the guide roller 2 31 is close to the edge of the guide part 12 to prevent the drive device from moving axially. The elastic effect of the connecting block 29 also ensures that the drive roller 2 4 is always close to the guide rail 1, ensuring smooth movement.

[0047] III. Disassembly and relocation;

[0048] The operator rotates the unlocking lever 20, which is threadedly connected to the outer casing 13. Rotation causes the triangular block 21 at one end to move inward. The inclined surface of the triangular block 21 engages with and presses against the inner wall of the unlocking groove 19 on the ratchet 18, forcing the ratchet 18 to overcome its elastic force and move away from the reinforcing rack 17, thus releasing the lock on the reinforcing gear 16. During the screwing-in process of the unlocking lever 20, its pressing inclined surface 27 pushes the slider 25 outward from the outer casing 13. The pulley 26 on the slider 25 extends outward, contacts the pipe 33, and gradually lifts the entire outer casing 13 from the surface of the pipe 33, causing components such as the scanning probe 6 to detach from the surface of the pipe 33. At this point, the operator can... The entire device can be directly dragged, and the pulley 26 rolls on the surface of the pipe 33 to move the guide rail 1 and the drive device to the next weld position without complete disassembly and reinstallation, which greatly improves the efficiency of continuous operation. After reaching the new weld position, the unlocking rod 20 is rotated in the opposite direction, the triangular block 21 retracts, and the ratchet 18 pops out again under the action of elastic force, ready for the next locking. At the same time, the squeezing inclined plane 27 also retracts, the slider 25 retracts under the action of spring, the pulley 26 disengages from the pipe 33, the entire device falls back, and the guide rail 1 fixing part 11 re-fits the pipe 33. At this time, simply rotate the reinforcing rod 15 again to complete the tightening and locking of the guide rail 1 in the new position and start the next round of flaw detection.

[0049] The specific embodiment of the present invention has been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the embodiments described above. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and ideas of the present invention should still fall within the protection scope of the present invention.

Claims

1. An ultrasonic flaw detection device for weld seams at metal component joints, characterized in that, Includes a guide rail, which is detachably mounted on the pipe. The guide rail is an integral flexible metal strip and is equipped with a locking component to fix it to the pipe. The guide rail is also equipped with a drive device, which includes a housing and two drive rollers rotatably connected to the housing. Both drive rollers are in contact with the guide rail. A motor is fixedly connected to the housing, and the output end of the motor is coaxially connected to the drive rollers. A scanning probe is mounted on the housing. The drive device drives the scanning probe to move along the guide rail and simultaneously drives the scanning probe to reciprocate along the pipe axis. A drive gear 1 is coaxially fixedly connected to a drive roller 1, and a drive gear 2 is rotatably connected to a housing 1. Drive gear 1 meshes with drive gear 2. A drive gear 3 is coaxially fixedly connected to drive gear 2. Drive gear 3 is an incomplete gear, and the central angle corresponding to the tooth of drive gear 3 is less than 90°. A sliding fixture is slidably connected to a housing 1. Two drive racks are fixedly connected to the sliding fixture. The two drive racks are located on both sides of drive gear 3, and both drive racks mesh with drive gear 3. The scanning probe is connected to the sliding fixture. The guide rail includes a fixed part and a guiding part. The fixed part contacts the pipe, and there is a gap between the guiding part and the pipe surface. Drive roller one and drive roller two are located on both sides of the guiding part and contact the guiding part. The locking assembly includes a second outer shell, which is fixedly connected to one end of a guide rail. The second outer shell has a connection hole with the same shape as the guide rail. A reinforcing rod is rotatably connected to the second outer shell, and a reinforcing gear is coaxially fixedly connected to the reinforcing rod. A reinforcing rack is provided on the fixed part, and the reinforcing gear meshes with the reinforcing rack. A ratchet is elastically connected inside the second outer shell, with the ratchet facing away from the first outer shell. An unlocking groove is provided on the ratchet. An unlocking rod is threadedly connected to the second outer shell, and a triangular block is rotatably connected to one end of the unlocking rod. The inclined surface on the triangular block is located on the side of the triangular block away from the guide rail, and the triangular block cooperates with the inner wall of the unlocking groove. A U-shaped block is rotatably connected to the outer casing 2. The U-shaped block encloses the reinforcing gear. Contact racks are provided on both sides of the inner wall of the U-shaped block. Magnets 1 are hinged to both sides of the U-shaped block and contact the pipe.

2. An ultrasonic flaw detection device for weld seams at metal joints according to claim 1, characterized in that, The outer casing has a slider that is elastically slidably connected to it. The slider is equipped with a pulley that contacts the pipe. The unlocking rod has a pressing slope that contacts the slider.

3. An ultrasonic flaw detection device for weld seams at metal joints according to claim 1, characterized in that, A magnet is provided at one end of the fixed part, and a connecting block is elastically slidably connected inside the outer shell. The drive roller is rotated and connected to the connecting block.

4. An ultrasonic flaw detection device for weld seams at metal joints according to claim 1, characterized in that, The outer casing is provided with a guide roller 1, which is inclined to the side where the guide rail is located and contacts the pipe. The outer casing is also provided with a guide roller 2, which contacts the edge of the guide section.

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