A device for inspecting cracks in a welded portion of a petroleum pipeline

Abstract

The present application relates to the technical fields of oil pipeline welding crack ultrasonic detection, in particular to a kind of oil pipeline welding crack inspection device, including positioning frame, positioning frame is equipped with two connecting shafts, connecting piece one and connecting piece two are equipped on each connecting shaft, connecting piece one and connecting piece two on the same connecting shaft are arranged back to back, the arc-shaped guide rail one and the arc-shaped guide rail two are respectively connected by bolt removal on connecting piece one and connecting piece two, and the butt joint end of arc-shaped guide rail one and the butt joint end of arc-shaped guide rail two are equipped with buckling mechanism, each arc-shaped guide rail one and arc-shaped guide rail two outer side wall are opened with arc-shaped groove, and the arc-shaped groove on the arc-shaped guide rail one of same side and the arc-shaped groove of corresponding arc-shaped guide rail two are connected to form continuous annular track, detection box is slidably connected between two annular tracks, and ultrasonic probe is provided on detection box, and efficient installation and disassembly are realized by buckling mechanism.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic testing technology for weld cracks in oil pipelines, and specifically to a device for inspecting cracks at weld joints in oil pipelines. Background Technology

[0002] Oil transportation primarily relies on pipeline systems. Oil pipelines are typically manufactured using high-strength carbon steel due to its excellent mechanical properties, mature processing technology, and wide range of specifications. Small-diameter carbon steel pipelines with a nominal diameter of DN≤200mm are commonly used for oil transportation in oilfield gathering and transportation systems, process pipelines within refineries, and terminal connection pipelines. These pipelines require welding for connection during installation or maintenance. To ensure weld quality and prevent leaks or breakages caused by defects such as cracks, lack of fusion, and porosity, non-destructive testing must be performed after welding.

[0003] Currently, conventional testing methods mostly employ ultrasonic testing. During operation, testing personnel need to select appropriate ultrasonic probes, testing equipment, and coupling agents based on the pipe material, wall thickness, and weld type. However, existing ultrasonic testing devices have complex structures and are typically installed on the pipe surface using bolt fastening. The disassembly and assembly process is time-consuming and labor-intensive, making rapid deployment and withdrawal difficult, which seriously affects on-site testing efficiency and operational flexibility.

[0004] To address the aforementioned issues, there is an urgent need to develop a device for inspecting cracks in welded joints of oil pipelines. This device should have a quick-assembly and disassembly structure, enabling efficient installation and disassembly, thereby significantly improving the convenience of inspection operations. Summary of the Invention

[0005] In response to the problems raised in the background art, the present invention provides a device for inspecting cracks at welded joints of oil pipelines. The present invention will be further described below.

[0006] A device for inspecting cracks in welded joints of oil pipelines includes a positioning frame with two connecting shafts fixedly connected to it. Each connecting shaft has a connector 1 and a connector 2 connected to it. Connectors 1 and 2 on the same connecting shaft are arranged back to back. Arc-shaped guide rail 1 and arc-shaped guide rail 2 are respectively connected to connectors 1 and 2. A fastening mechanism is provided between the mating ends of arc-shaped guide rail 1 and arc-shaped guide rail 2. Arc-shaped guide rail 1 and arc-shaped guide rail 2 on the same side are arranged back to back. Arc-shaped grooves are formed on the outer walls of each arc-shaped guide rail 1 and arc-shaped guide rail 2. The arc-shaped grooves on arc-shaped guide rail 1 and the corresponding arc-shaped grooves on arc-shaped guide rail 2 on the same side connect to form a continuous annular track. A detection box is slidably connected between the two annular tracks. An ultrasonic probe is provided on the detection box.

[0007] Preferably, the fastening mechanism includes an embedded pin that slides into the mating end of the first end of the arc-shaped guide rail, a compression spring is provided between the pin and the mating end of the first end of the arc-shaped guide rail, the outer end of the pin is provided with a bevel, and a latch is fixedly connected to the side wall of the mating end of the second end of the arc-shaped guide rail, the latch is provided with a locking groove, and the locking groove and the bevel on the pin are engaged.

[0008] Preferably, it also includes a quick-release mechanism mounted on the positioning frame. The quick-release mechanism includes a locking frame that slides vertically through the positioning frame. A storage spring is provided between the locking frame and the positioning frame. The bottom of the locking frame has two symmetrically distributed working ends. Each working end has a pin 1 and a pin 2 embedded and slidably connected. A connecting ring 1 and a connecting ring 2 are rotatably connected to the connecting shaft. The connecting ring 1 is fixedly connected to the connecting piece 1, and the connecting ring 2 is fixedly connected to the connecting piece 2. The connecting ring 1 has a protrusion 1, and the connecting ring 2 has a protrusion 2. The protrusion 1 and the protrusion 2 form cross sections on the connecting ring 1 and the connecting ring 2, respectively. The bottom of the pin 1 and one side wall of the protrusion are engaged in a limiting engagement. The bottom of the pin 2 and the side wall of the protrusion 2 are engaged in a limiting engagement.

[0009] Preferably, it also includes a drive mechanism mounted on the detection box. The drive mechanism includes a motor installed inside the detection box. A worm gear is keyed to the output shaft of the motor. The worm gear is connected to the detection box via a support seat. A rotating rod is horizontally connected through the detection box. Gears are keyed to both the left and right ends of the rotating rod. Arc-shaped guide rail one and arc-shaped guide rail two are provided with arc-shaped racks on their top surfaces. The gears mesh with the adjacent arc-shaped racks. A worm wheel is keyed to the middle of the rotating rod. The worm wheel meshes with the worm gear.

[0010] Preferably, it also includes a coating mechanism disposed on the detection box. The coating mechanism includes a rotating frame connected to a rotating rod. An ultrasonic probe is installed at one end of the rotating frame and a coating box is installed at the other end. A storage box is installed inside the detection box. The storage box and the coating box are connected by a conveying pipe. A pump is provided on the conveying pipe.

[0011] Preferably, the bottom of the coating box is connected to a downwardly inclined rotating plate, and a torsion spring is provided between the rotating plate and the coating box.

[0012] Preferably, the detection box is equipped with an electric push rod, and the output shaft of the electric push rod is hinged to one end of the rotating frame near the ultrasonic probe.

[0013] Preferably, the positioning frame is provided with a handle.

[0014] Beneficial effects: This device uses pins one and two to limit protrusions one and two respectively, keeping the arc-shaped guide rails one and two in an open state initially, facilitating their installation on the outer circumference of the pipe. During installation, pulling up the locking bracket releases the constraints of pins one and two on protrusions one and two, and then rotating the arc-shaped guide rails one and two inward around the connecting axis to the closed position; the tail end achieves self-locking through the elastic snap-fit ​​structure between the inclined surface of the pin and the locking groove, completing the overall fixation; during disassembly, simply pressing down the pin releases the tail self-locking, and pulling up the locking bracket unlocks the device, improving on-site installation and disassembly efficiency.

[0015] The coupling agent liquid level rises and automatically opens the rotating plate to form a micro-slit, achieving automatic coating of the coupling agent. When the rotating plate is open, the torsion spring provides a continuous downward pressing force, applying moderate squeezing force to the outflowing coupling agent, effectively removing entrained air bubbles and significantly improving ultrasonic transmittance. After the feeding stops, the torsion spring drives the rotating plate to close automatically to prevent the coupling agent from dripping.

[0016] Through the cooperation of worm gear, worm wheel, gear, and arc rack in the drive mechanism, the detection box moves around a complete circular track. At the same time, the electric push rod drives the rotating frame to swing. During the coating stage, the ultrasonic probe is raised to avoid obstruction, and the coating box moves down to fit the weld. During the detection stage, the coating box is raised to seal, and the ultrasonic probe moves down to the optimal detection position. In this way, the coating and detection functions are integrated and work together in a process sequence of coating first and then detection, which improves the reliability and automation level of detection. Attached Figure Description

[0017] Figure 1 : A three-dimensional structural schematic diagram of the present invention;

[0018] Figure 2 : A schematic diagram of the quick assembly / disassembly mechanism of the present invention;

[0019] Figure 3 : A schematic diagram of the structure of the connecting shaft, connector one, connector two, and other components of this invention;

[0020] Figure 4 : A schematic diagram of the structure of the connecting ring one, protrusion one, protrusion two, and other components of the present invention;

[0021] Figure 5 : A schematic diagram of the fastening mechanism of the present invention;

[0022] Figure 6 : A schematic diagram of the structure of the rack, arc groove, gear and other components of this invention;

[0023] Figure 7 : A schematic diagram of the drive mechanism of the present invention;

[0024] Figure 8: A schematic diagram of the coating mechanism of the present invention;

[0025] In the diagram: 1-Positioning frame, 2-Electric push rod, 3-Handle, 4-Connecting shaft, 5-Connector 1, 6-Connecting ring 1, 601-Protrusion 1, 7-Connector 2, 8-Connecting ring 2, 801-Protrusion 2, 9-Locking frame, 10-Storage spring, 11-Pin 1, 12-Pin 2, 13-Arc guide rail 1, 131-Arc guide rail 2, 14-Rack, 15-Arc groove, 151-Circular track, 16-Lock, 161-Locking groove, 17-Pin, 18-Compression spring, 19-Detection box, 20-Gear, 21-Motor, 22-Worm, 23-Rotating rod, 24-Worm wheel, 25-Rotating frame, 26-Ultrasonic probe, 27-Coating box, 271-Rotating plate, 272-Torsion spring, 28-Storage box, 29-Conveying pipe, 30-Pump. Detailed Implementation

[0026] Next, combine Figures 1-8 A specific embodiment of the present invention will be described in detail below.

[0027] refer to Figure 1 and Figure 2 A device for inspecting cracks in welded joints of oil pipelines includes a positioning frame 1 used on the oil pipeline. Two symmetrically distributed connecting shafts 4 are fixed to the positioning frame 1. Each connecting shaft 4 is connected to a first connector 5 and a second connector 7. The first connector 5 and the second connector 7 on the same connecting shaft 4 are arranged back-to-back. Arc-shaped guide rails 13 and 131 are respectively connected to the first connector 5 and the second connector 7. A fastening mechanism is provided between the mating ends of the first arc-shaped guide rail 13 and the second arc-shaped guide rail 131 to reliably close the mating ends and allow for rapid opening. The first arc-shaped guide rail 13 and the second arc-shaped guide rail 131 on the same side are arranged back-to-back, with their two ends forming an open head and a closed tail, respectively. At the joint, when the arc-shaped guide rail 13 and arc-shaped guide rail 21 on the same side rotate around the connecting shaft 4 to the working position, their joint ends close together to form a complete ring guide rail structure for surrounding the outer wall of the oil pipeline. Two such ring guide rail structures are symmetrically arranged on the left and right sides of the pipeline weld. Each of the arc-shaped guide rail 13 and arc-shaped guide rail 211 has an arc-shaped groove 15 on its outer wall. The arc-shaped groove 15 on the arc-shaped guide rail 13 on the same side and the arc-shaped groove 15 on the corresponding arc-shaped guide rail 21 connect to form a continuous ring track 151. A detection box 19 is slidably connected between the two ring tracks 151. An ultrasonic probe 26 is provided on the detection box 19 for circumferential ultrasonic scanning of the pipeline weld area.

[0028] refer to Figure 5The fastening mechanism includes a pin 17 that is embedded and slides at the tail end of the arc-shaped guide rail 13. A compression spring 18 is provided between the pin 17 and the tail end of the arc-shaped guide rail 13. Without external force, the compression spring 18 pushes the pin 17 outward. The outer end of the pin 17 has a bevel. A latch 16 is fixed to the side wall of the tail end of the arc-shaped guide rail 131. The latch 16 has a locking groove 161. The locking groove 161 and the bevel on the pin 17 engage. When the arc-shaped guide rail 13 and the arc-shaped guide rail 131 are closed, the bevel of the pin 17 can slide into the locking groove 161 and be limited by it, thereby locking the tail end.

[0029] refer to Figure 2 , Figure 3 and Figure 4 To achieve rapid assembly and disassembly, the positioning frame 1 is equipped with a quick-assembly and disassembly mechanism for locking or releasing the open ends of the arc-shaped guide rail 13 and the arc-shaped guide rail 2131. The quick-assembly and disassembly mechanism includes a locking frame 9 that is vertically slidably connected to the positioning frame 1. A storage spring 10 is provided between the locking frame 9 and the positioning frame 1. The bottom of the locking frame 9 has two symmetrically distributed working ends, and each working end is embedded with a pin 11 and a pin 2 slidably connected. The connecting shaft 4 rotates... The device is equipped with a first connecting ring 6 and a second connecting ring 8. The first connecting ring 6 is fixedly connected to a first connecting piece 5, and the second connecting ring 8 is fixedly connected to a second connecting piece 7. The first connecting ring 6 has a first protrusion 601, and the second connecting ring 8 has a second protrusion 801. The first protrusion 601 and the second protrusion 801 form cross sections on the first connecting ring 6 and the second connecting ring 8, respectively. The bottom of the first pin 11 is engaged with the side wall of the first protrusion 601, and the bottom of the second pin 12 is engaged with the side wall of the second protrusion 801.

[0030] When the arc-shaped guide rail 13 and the arc-shaped guide rail 2 131 are in the open state, under the action of the storage spring 10, the locking frame 9 is in the low position, and the pin 11 and the pin 2 12 are simultaneously in the low position and respectively locked onto the side wall of the protrusion 1 601 and the protrusion 2 801, restricting the connecting ring 1 6 and the connecting ring 2 8 from rotating in the closing direction, thereby maintaining the open state of the arc-shaped guide rail 13 and the arc-shaped guide rail 2 131, which is convenient for pipe installation.

[0031] Initially, under the action of the storage spring 10, the working end of the locking frame 9 is in a low position. The first protrusion 601 and the bottom end of the first pin 11, and the second protrusion 801 and the bottom end of the second pin 12 form a limiting engagement. The first connecting ring 6 and the second connecting ring 8 cannot be closed and rotated. The first arc guide rail 13 and the second arc guide rail 131 are in an open wing shape. The pin 17 extends under the action of the compression spring 18, but because the guide rail is not closed, its inclined surface does not contact the locking groove 161.

[0032] Installation Stage: Pull the locking bracket 9 upwards to compress the storage spring 10, causing pin 11 and pin 2 to move upwards synchronously, releasing them from the limiting constraints on protrusion 601 and protrusion 801. At this time, connecting ring 6 and connecting ring 8 can rotate freely around the connecting shaft 4. Rotate the arc-shaped guide rail 13 and arc-shaped guide rail 2131 on the same side towards the center of the pipeline to the closed position, so that their mating ends fit together and surround the outer wall of the oil pipeline.

[0033] When the locking frame 9 is released, it automatically returns to its low position under the action of the storage spring 10. At this time, pin 11 and pin 2 are misaligned with protrusion 601 and protrusion 801, and no longer cause rotational interference.

[0034] When the two guide rails are closed, the latch 16 presses the inclined surface on the pin 17, causing the pin 17 to retract. The compression spring 18 is compressed and deformed until the latch 16 passes the inclined surface on the pin 17. Under the action of the compression spring 18, the pin 17 and its inclined surface automatically pop out. The inclined surface slides into the locking groove 161 and is locked, thereby locking the tail end of the arc-shaped guide rail 13 and the arc-shaped guide rail 2 131.

[0035] Disassembly stage: First, press down on the pin 17 to disengage its inclined surface from the locking groove 161 and unlock the tail; pull up the locking frame 9 to move pin 11 and pin 2 12 upwards to avoid obstruction; at this time, connecting ring 1 6 and connecting ring 2 8 regain their rotational freedom and can rotate outwards to open the arc guide rail 1 13 and arc guide rail 2 131. After the guide rails are fully open, release the locking frame 9. Under the action of the storage spring 10, pin 1 11 and pin 2 12 move down again and are once again engaged with the side walls of protrusion 1 601 and protrusion 2 801, locking the arc guide rail 1 13 and arc guide rail 2 131 in the open state for easy use next time.

[0036] This device uses pin 11 and pin 212 to limit protrusions 601 and 801 respectively, keeping the arc-shaped guide rails 13 and 131 in an open wing shape for easy insertion into pipes. Pulling up the locking bracket 9 releases the pins 11 and 12 from their constraints on protrusions 601 and 801, allowing the arc-shaped guide rails 13 and 131 to rotate around the connecting shaft 4 to a closed position. The tail end achieves self-locking through the elastic engagement between the inclined surface of the pin 17 and the locking groove 161, thus completing the overall installation. For disassembly, simply press down the pin 17 to release the tail self-locking, and pull up the locking bracket 9 to unlock. This structure is simple to operate, provides reliable locking, and significantly improves on-site installation and disassembly efficiency.

[0037] refer to Figure 6 and Figure 7To facilitate the circumferential scanning of the ultrasonic probe 26 on the detection box 19 along the annular track 151, this device is equipped with a drive mechanism inside the detection box 19. The drive mechanism includes a motor 21 installed inside the detection box 19. A worm gear 22 is keyed to the output shaft of the motor 21. The worm gear 22 is connected to the detection box 19 through a support seat to ensure its rotational stability. A rotating rod 23 is horizontally connected through the detection box 19. Gears 20 are keyed to both the left and right ends of the rotating rod 23. Arc-shaped racks 14 are provided on the top surfaces of the arc-shaped guide rail 13 and the arc-shaped guide rail 231. The gears 20 mesh with the adjacent arc-shaped racks 14. A worm wheel 24 is keyed to the middle of the rotating rod 23. The worm wheel 24 meshes with the worm gear 22.

[0038] Once the first arc-shaped guide rail 13 and the second arc-shaped guide rail 131 are locked together and form a complete circular track 151, the motor 21 is started. Its output shaft drives the worm gear 22 to rotate. The worm gear 22 meshes with the worm wheel 24, driving the worm wheel 24 and the rotating rod 23 to rotate synchronously, thereby driving the gears 20 at both ends to rotate. The gears 20 mesh with the arc-shaped racks 14 on both sides, pushing the detection box 19 to move smoothly and directionally around the circular track 151, thereby driving the ultrasonic probe 26 to perform continuous detection operations on the pipe weld area.

[0039] refer to Figure 8 Before the ultrasonic probe 26 performs the detection, a coupling agent needs to be applied to the weld area of ​​the pipe. Therefore, this device has a coating mechanism on the detection box 19. The coating mechanism includes a rotating frame 25 connected to the rotating rod 23. The ultrasonic probe 26 is installed at one end of the rotating frame 25, and the coating box 27 is installed at the other end. The ultrasonic probe 26 and the coating box 27 switch working positions by swinging the rotating frame 25. The purpose is to complete the coupling agent coating first and then perform ultrasonic detection. A storage box 28 is installed in the detection box 19 to store the coupling agent. The storage box 28 and the coating box 27 are connected by a delivery pipe 29. A pump 30 is installed on the delivery pipe 29 to control the quantitative delivery of the coupling agent.

[0040] To achieve a uniform, bubble-free coating effect, a downwardly inclined rotating plate 271 is connected to the bottom of the coating box 27. A torsion spring 272 is provided between the rotating plate 271 and the coating box 27, keeping the rotating plate 271 closed under normal conditions. When there is excess coupling agent in the coating box 27, the liquid level rises, and the coupling agent generates an upward lifting force on the inside of the rotating plate 271, lifting the rotating plate 271 upward. The torsion spring 272 deforms, forming a tiny gap at the bottom of the coating box 27. The coupling agent flows out through this gap and evenly covers the surface of the pipe weld. The advantage is that the rebound force provided by the torsion spring 272 applies a moderate compression to the flowing coupling agent, which helps to remove entrained air bubbles and improves the acoustic coupling quality.

[0041] To achieve the work sequence of coating first and then detection, the detection box 19 is equipped with an electric push rod 2, and the output shaft of the electric push rod 2 is hinged to one end of the rotating frame 25 near the ultrasonic probe 26.

[0042] After the device is in place, the rotating frame 25 is in a horizontal and balanced position, the coating box 27 and the ultrasonic probe 26 are both in a non-working clearance position, and the storage box 28 has been pre-filled with sufficient coupling agent.

[0043] Coating stage: The electric push rod 2 is activated, its output shaft extends, pushing the end of the rotating frame 25 closest to the ultrasonic probe 26 upwards, causing one end of the coating box 27 to move downwards to the coating position close to the pipe weld. Pump 30 is then activated, and the coupling agent is injected into the coating box 27 via the delivery pipe 29. As the coupling agent is expelled, the rotating plate 271 opens upwards under hydraulic pressure, the torsion spring 272 deforms, forming a tiny gap at the bottom of the coating box 27. The coupling agent flows out through this gap and evenly covers the surface of the pipe weld.

[0044] Circular coating: After the coupling agent begins to flow out steadily, start the drive motor 21, and the detection box 19 will circle around the circular track 151 once to complete the continuous coating of the weld area.

[0045] Detection Phase: After coating is completed, the output shaft of the electric push rod 2 retracts, causing the rotating frame 25 to swing in the opposite direction, moving the ultrasonic probe 26 down to the detection position close to the weld seam. At the same time, the coating box 27 is raised to avoid it. At this time, the pump 30 is turned off, the material supply in the coating box 27 stops, and under the action of the torsion spring 272, the rotating plate 271 automatically resets and closes to prevent residual coupling agent from dripping.

[0046] The stroke of the electric push rod 2 is precisely calculated to ensure that the coating box 27 and the ultrasonic probe 26 reach the optimal contact distance at their respective stations, balancing coating uniformity and ultrasonic detection sensitivity.

[0047] The positioning frame 1 is equipped with a handle 3, which facilitates the handling and operation of the device.

[0048] In summary, pin 11 and pin 2 12 respectively limit protrusions 601 and 801, keeping arc-shaped guide rail 13 and 131 open in their initial state, facilitating their placement on the outer circumference of the pipe. During installation, pulling up the locking bracket 9 releases the constraints of pins 11 and 12 on protrusions 601 and 801. Then, arc-shaped guide rail 13 and 131 are rotated inward around the connecting shaft 4 to the closed position. At this point, their tails self-lock through the elastic engagement structure between the inclined surface of pin 17 and the locking groove 161, completing the overall fixation. For disassembly, simply press down pin 17 to release the tail self-locking, and then pull up the locking bracket 9 to unlock. This structure is easy to operate, provides reliable locking, and significantly improves on-site installation and disassembly efficiency.

[0049] The coupling agent opens the rotating plate 271 to form a micro-slit, achieving automatic coating of the coupling agent. The torsion spring 272 provides a continuous downward pressing force when the rotating plate 271 is open, applying a moderate squeezing force to the outflowing coupling agent, effectively removing entrained air bubbles and significantly improving ultrasonic transmittance. After the feeding stops, the torsion spring 272 drives the rotating plate 271 to close automatically to prevent the coupling agent from dripping.

[0050] Through the cooperation of the worm 22, worm wheel 24, gear 20, and arc rack 14 in the drive mechanism, the detection box 19 is made to rotate along the complete circular track 151. At the same time, the electric push rod 2 drives the rotating frame 25 to swing. In the coating stage, the ultrasonic probe 26 is raised to avoid the weld, and the coating box 27 is lowered to fit the weld. In the detection stage, the coating box 27 is raised to seal, and the ultrasonic probe 26 is lowered to the optimal detection position. Thus, the coating and detection functions are integrated and work together in the process sequence of coating first and then detection, which improves the reliability and automation level of detection.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A device for inspecting cracks at welded joints of oil pipelines, comprising a positioning frame (1), characterized in that: Two connecting shafts (4) are fixedly connected to the positioning frame (1). Each connecting shaft (4) is connected to a connecting part one (5) and a connecting part two (7). The connecting parts one (5) and the connecting part two (7) on the same connecting shaft (4) are arranged back to back. Arc-shaped guide rail one (13) and arc-shaped guide rail two (131) are respectively connected to the connecting parts one (5) and the connecting part two (7). A fastening mechanism is provided between the mating end of the arc-shaped guide rail one (13) and the mating end of the arc-shaped guide rail two (131). Arc-shaped guide rail one (13) and arc-shaped guide rail two (131) are arranged in opposite directions. Each of the arc-shaped guide rail one (13) and arc-shaped guide rail two (131) has an arc-shaped groove (15) on its outer side wall. The arc-shaped groove (15) on the arc-shaped guide rail one (13) on the same side and the arc-shaped groove (15) on the corresponding arc-shaped guide rail two (131) are connected to form a continuous ring track (151). A detection box (19) is slidably connected between the two ring tracks (151). An ultrasonic probe (26) is provided on the detection box (19).

2. The oil pipeline weld crack inspection device according to claim 1, characterized in that: The fastening mechanism includes a pin (17) that is embedded and slidably connected to the end of the arc-shaped guide rail (13). A compression spring (18) is provided between the pin (17) and the end of the arc-shaped guide rail (13). The outer end of the pin (17) is provided with a bevel. A latch (16) is fixedly connected to the side wall of the end of the arc-shaped guide rail (131). A locking groove (161) is opened on the latch (16). The locking groove (161) and the bevel on the pin (17) are engaged.

3. The oil pipeline weld crack inspection device according to claim 1, characterized in that: It also includes a quick-release mechanism set on the positioning frame (1), the quick-release mechanism including a locking frame (9) that slides vertically through the positioning frame (1), a storage spring (10) between the locking frame (9) and the positioning frame (1), the bottom of the locking frame (9) is provided with two symmetrically distributed working ends, each working end is embedded with a pin 1 (11) and a pin 2 (12), the connecting shaft (4) is connected to a connecting ring 1 (6) and a connecting ring 2 (8), the connecting ring 1 (6) Connector 1 (5) is fixedly connected to connector 2 (8) and connector 2 (7). Connector 1 (6) is provided with protrusion 1 (601) and connector 2 (8) is provided with protrusion 2 (801). Protrusion 1 (601) and protrusion 2 (801) form cross sections on connector 1 (6) and connector 2 (8) respectively. The bottom of pin 1 (11) and the side wall of protrusion 1 (601) are locked and engaged. The bottom of pin 2 (12) and the side wall of protrusion 2 (801) are locked and engaged.

4. The oil pipeline weld crack inspection device according to claim 1, characterized in that: It also includes a drive mechanism installed on the detection box (19). The drive mechanism includes a motor (21) installed in the detection box (19). A worm (22) is keyed to the output shaft of the motor (21). The worm (22) is connected to the detection box (19) through a support seat. A rotating rod (23) is horizontally connected through the detection box (19). The rotating rod (23) is keyed to both the left and right ends of the detection box (19). The top surfaces of the first arc-shaped guide rail (13) and the second arc-shaped guide rail (131) are provided with arc-shaped racks (14). The gears (20) mesh with the adjacent arc-shaped racks (14). A worm wheel (24) is keyed to the middle of the rotating rod (23). The worm wheel (24) meshes with the worm (22).

5. The oil pipeline weld crack inspection device according to claim 1, characterized in that: It also includes a coating mechanism on the test box (19), the coating mechanism includes a rotating frame (25) connected to the rotating rod (23), one end of the rotating frame (25) is equipped with an ultrasonic probe (26), and the other end is equipped with a coating box (27). A storage box (28) is installed inside the test box (19), and the storage box (28) and the coating box (27) are connected by a conveying pipe (29), and a pump (30) is provided on the conveying pipe (29).

6. The oil pipeline weld crack inspection device according to claim 5, characterized in that: The bottom of the coating box (27) is connected to a downwardly inclined rotating plate (271), and a torsion spring (272) is provided between the rotating plate (271) and the coating box (27).

7. The oil pipeline weld crack inspection device according to claim 5, characterized in that: The detection box (19) is equipped with an electric push rod (2), and the output shaft of the electric push rod (2) is hinged to one end of the rotating frame (25) near the ultrasonic probe (26).

8. The oil pipeline weld crack inspection device according to claim 1, characterized in that: The positioning frame (1) is provided with a handle (3).

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