Defect Detection Device for Welds of Water Conservancy Pipelines

Abstract

The present invention discloses a detection device for weld defects of water conservancy pipelines, specifically relating to the technical field of pipeline weld detection, including a support frame and ultrasonic probes. At least two sets of adjusting mechanisms are arranged on the support frame. Through the arrangement of the adjusting mechanism, on the one hand, when there is a convex situation in the detection path during the detection process, the controller controls the current of the electromagnet to decrease, so that the air pressure between the first piston and the second piston decreases, avoiding an increase in the thrust applied to the ultrasonic probe. On the other hand, when there is a concave situation in the detection path during the detection process, the controller controls the current of the electromagnet to increase, so that the air pressure between the first piston and the second piston increases, avoiding affecting the contact force between the ultrasonic probe and the pipeline wall. Therefore, the thrust on the ultrasonic probe can be adaptively adjusted according to the undulation of the pipeline, so that the contact force between the ultrasonic probe and the pipeline wall is maintained at an appropriate level, thereby improving the detection accuracy and data reliability.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline weld detection, and more specifically, to a water conservancy pipeline weld defect detection device. Background Art

[0002] Pipeline welding is a technology that relies on heating and pressurization to stably connect two sections of pipelines. However, due to the influence of welding materials, processes and equipment, the welds will inevitably have defects such as incomplete penetration, pores, slag inclusions, incomplete fusion, incomplete penetration, and undercuts. In addition, the butt welds of pipelines are easily disturbed by external factors and produce defects such as fatigue cracks. The quality of pipeline welds is directly related to the safe and stable operation of the entire system. Through defect detection, potential problems can be discovered and repaired in a timely manner, extending the service life of the pipeline system, reducing maintenance costs, and ensuring personnel and environmental safety.‌

[0003] The Chinese patent application number 202411746860.X discloses an online detection device for thick-walled pipe weld defects, including a workbench, a hydraulic cylinder 1 and a support ring. The telescopic end of the hydraulic cylinder 1 is equipped with a work frame, and the internal rotation of the work frame is equipped with two sets of transport rollers, and a motor 1 is installed. The two sets of transport rollers are connected to the motor 1 through a gear set. The device enters the sensing area between the micro-gratings upward through the baffle bar, and automatically shuts down the hydraulic cylinder 3 through the controller to maintain a constant compression distance of the spring 2 by the limit ring. When the ultrasonic probe faces workpieces of different sizes, it only needs to adjust the telescopic stroke of the hydraulic cylinder 3 and move the baffle bar to the specified position to keep the compression stroke of the spring 2 unchanged, so that the pressure between the ultrasonic probe and the workpiece surface is constant, avoiding excessive pressure and causing excessive wear on the bottom surface of the ultrasonic probe, thereby extending the service life of the device.

[0004] Although the above invention can keep the compression stroke of the spring unchanged when facing workpieces of different sizes, so that the pressure between the ultrasonic probe and the workpiece surface is constant, since the pipeline surface may have undulations of different heights, when the contact force between the ultrasonic probe and the workpiece surface is constant, when detecting the raised area, the contact force between the ultrasonic probe and the workpiece surface will increase, which will accelerate the wear of the probe. When detecting the recessed area, the contact force between the ultrasonic probe and the workpiece surface will decrease, which will cause the detection accuracy to decrease and affect the reliability of the data. In addition, welding slag may splash during the pipeline welding process. When there is welding slag around the weld, the ultrasonic probe will come into contact with the welding slag during the moving detection process, which will scratch or seriously wear the surface of the probe, or even directly damage it, seriously affecting the service life of the ultrasonic probe.

[0005] The present invention provides a device for detecting weld defects in water conservancy pipelines, aiming to solve the problems that the constant contact force between the ultrasonic probe and the workpiece surface leads to accelerated wear of the probe and a decrease in detection accuracy, and when there is welding slag around the weld, the ultrasonic probe will contact the welding slag during the moving detection process, seriously affecting the service life of the ultrasonic probe. Summary of the Invention

[0006] The purpose of the present invention is to provide a device for detecting weld defects in water conservancy pipelines, so as to solve the problems mentioned in the above background technology that the constant contact force between the ultrasonic probe and the workpiece surface leads to accelerated wear of the probe and a decrease in detection accuracy, and when there is welding slag around the weld, the ultrasonic probe will contact the welding slag during the moving detection process, seriously affecting the service life of the ultrasonic probe.

[0007] To achieve the above purpose, the present invention provides the following technical solution: A device for detecting weld defects in water conservancy pipelines, including a support frame and an ultrasonic probe. At least two groups of adjusting mechanisms are arranged on the support frame, and a detection mechanism is arranged in each group of adjusting mechanisms;

[0008] The adjusting mechanism includes a support block. An adjusting chamber is opened at the bottom of the support block. A first piston is slidably connected in the adjusting chamber. An electromagnet is fixedly embedded at the top of the adjusting chamber. A second piston is slidably connected between the electromagnet and the first piston inside the adjusting chamber. A magnetic member is fixedly connected to the side of the second piston close to the electromagnet. A pressure sensor is arranged between the second piston and the first piston inside the adjusting chamber.

[0009] Preferably, the detection mechanism includes a lifting rod. A lifting groove is opened at the bottom of the support block. The lifting groove is located in front of the moving direction of the adjusting chamber. The lifting rod is slidably connected inside the lifting groove. A first conductive contact is fixedly embedded inside the lifting groove. A second conductive contact is fixedly connected to the side of the lifting rod close to the first conductive contact. When the lifting rod moves upward in the lifting groove, the second conductive contact can contact the first conductive contact and generate an electrical signal.

[0010] Preferably, a support rod is fixedly connected to the side of the first piston away from the second piston. The ultrasonic probe is rotatably connected to the end of the support rod away from the first piston.

[0011] Preferably, an elastic member is connected between one end of the lifting rod located inside the lifting groove and the lifting groove. The end of the lifting rod located outside the lifting groove is rotatably connected to a detection roller.

[0012] Preferably, a controller is provided on the support frame. The electromagnet and the air pressure sensor are both electrically connected to the controller, and the controller can receive the electrical signal generated by the contact between the second conductive contact piece and the first conductive contact piece.

[0013] Preferably, when the controller receives the electrical signal generated by the contact between the second conductive contact piece and the first conductive contact piece, the controller changes the current direction of the electromagnet, so that the magnetic poles between the electromagnet and the magnetic part change from the state of repulsion between like poles to the state of attraction between opposite poles.

[0014] Preferably, the support frame is composed of two hinged brackets. Rotating clamps are provided at the hinged joints of the two brackets, and the clamping force on the two brackets can be adjusted by rotating the rotating clamps.

[0015] Preferably, a limiting block is fixedly connected to one side of the support block in the moving direction. Adjustment grooves are provided on one side of the two brackets in the moving direction, and the two limiting blocks in the two groups of adjustment mechanisms are both slidably connected in the same adjustment groove.

[0016] Preferably, threaded holes are provided on one side of the two limiting blocks away from the support block, and fixing buttons are threadedly connected in the two threaded holes.

[0017] Preferably, legs are fixedly connected to the four corners of the bottom of the support frame. A magnetic wheel is rotatably connected to the bottom of each leg, and a motor for driving the corresponding magnetic wheel to rotate is provided inside each leg. Each motor is electrically connected to the controller.

[0018] The technical effects and advantages of the present invention:

[0019] 1. Through the setting of the adjustment mechanism, on the one hand, when there are protrusions in the detection path during the detection process, the controller controls the current of the electromagnet to decrease, so that the gas can push the second piston upward, reducing the air pressure between the first piston and the second piston, avoiding an increase in the thrust applied to the ultrasonic probe, and thus preventing the ultrasonic probe from being worn out. On the other hand, when there are depressions in the detection path during the detection process, the controller controls the current of the electromagnet to increase, increasing the thrust on the second piston, increasing the air pressure between the first piston and the second piston, avoiding affecting the contact force between the ultrasonic probe and the pipe wall, and thus being able to adaptively adjust the thrust on the ultrasonic probe according to the undulation of the pipe, keeping the contact force between the ultrasonic probe and the pipe wall at an appropriate level, thereby improving the detection accuracy and data reliability;

[0020] 2. Through the setting of the detection mechanism in the present invention, when welding slag appears in the detection path during the detection process, an electrical signal will be generated when the second conductive contact touches the first conductive contact. The controller can receive the electrical signal and determine the position of the welding slag. When the ultrasonic probe reaches the position of the welding slag, the controller changes the current direction of the electromagnet to lift the ultrasonic probe, avoiding contact between the ultrasonic probe and the welding slag, preventing scratches or severe wear of the probe, reducing the maintenance and replacement costs of the probe, and thus increasing the service life of the ultrasonic probe. Description of the Drawings

[0021] Figure 1 It is a schematic diagram of the control flow of the present invention.

[0022] Figure 2 It is a schematic diagram of the detection state of the present invention.

[0023] Figure 3 It is a schematic diagram of the overall structure of the present invention.

[0024] Figure 4 It is a cross-sectional view of the overall internal structure of the present invention.

[0025] Figure 5 It is a schematic diagram of the structure of the adjustment mechanism of the present invention.

[0026] Figure 6 It is a cross-sectional view of the internal structure of the support block of the present invention.

[0027] Figure 7 It is a cross-sectional view of the internal structure of the lifting groove of the present invention.

[0028] Reference numerals are: 1, support frame; 11, bracket; 12, rotary clamp; 13, adjustment groove; 14, leg; 15, magnetic wheel; 2, ultrasonic probe; 3, adjustment mechanism; 31, support block; 32, adjustment chamber; 33, first piston; 34, electromagnet; 35, second piston; 36, magnetic member; 37, air pressure sensor; 38, support rod; 39, limit block; 310, threaded hole; 311, fixing knob; 4, detection mechanism; 41, lifting rod; 42, lifting groove; 43, first conductive contact; 44, second conductive contact; 45, elastic member; 46, detection roller. Detailed Embodiments

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] There may be undulations or depressions of different heights on the surface of the pipeline. When the contact force between the ultrasonic probe and the workpiece surface is constant, when detecting the convex area, it will cause the contact force between the ultrasonic probe and the workpiece surface to increase, accelerating the wear of the probe. When detecting the concave area, it will cause the contact force between the ultrasonic probe and the workpiece surface to decrease, resulting in a decrease in detection accuracy and affecting the reliability of the data.

[0031] Embodiment 1

[0032] Reference Figures 1 to 7 , A weld defect detection device for a water conservancy pipeline according to an embodiment of the present invention includes a support frame 1 and an ultrasonic probe 2. At least two sets of adjustment mechanisms 3 are provided on the support frame 1. The support frame 1 is composed of two hinged brackets 11. Rotating clamps 12 are provided at the hinged parts of the two brackets 11. By rotating the rotating clamps 12, the clamping force on the two brackets 11 can be adjusted. The rotating clamps 12 are prior art and will not be elaborated here.

[0033] Reference Figure 5 and Figure 6 , The adjustment mechanism 3 includes a support block 31. An adjustment chamber 32 is opened at the bottom of the support block 31. A first piston 33 is slidably connected in the adjustment chamber 32. An electromagnet 34 is fixedly embedded at the top of the adjustment chamber 32. A second piston 35 is slidably connected between the electromagnet 34 and the first piston 33 inside the adjustment chamber 32. A magnetic member 36 is fixedly connected to the side of the second piston 35 close to the electromagnet 34. A pressure sensor 37 is provided between the second piston 35 and the first piston 33 inside the adjustment chamber 32. The pressure sensor 37 is used to detect the air pressure between the second piston 35 and the first piston 33. A controller is provided on the support frame 1. The electromagnet 34 and the pressure sensor 37 are both electrically connected to the controller. A support rod 38 is fixedly connected to the side of the first piston 33 away from the second piston 35. The ultrasonic probe 2 is rotatably connected to the end of the support rod 38 away from the first piston 33.

[0034] Reference Figures 4 to 6 , A limiting block 39 is fixedly connected to one side of the support block 31 in the moving direction. Adjustment grooves 13 are opened on both brackets 11 on one side in the moving direction. The two limiting blocks 39 in the two sets of adjustment mechanisms 3 are both slidably connected in the same adjustment groove 13. Threaded holes 310 are opened on the sides of the two limiting blocks 39 away from the support block 31. Fixing buttons 311 are threadedly connected in the two threaded holes 310. The fixing buttons 311 are prior art and will not be elaborated here.

[0035] Reference Figure 3, legs 14 are fixedly connected to the bottom of the support frame 1 at the four corner positions. A magnetic wheel 15 is rotatably connected to the bottom of each leg 14. A motor for driving the corresponding magnetic wheel 15 to rotate is provided inside each leg 14. The motor can drive the magnetic wheel 15 to rotate through gear transmission. Each motor is electrically connected to the controller.

[0036] During actual operation, first rotate the rotary clamp 12 to reduce the clamping force of the rotary clamp 12 on the two brackets 11. At this time, the two brackets 11 can be adjusted to the required angle. After the adjustment is completed, rotate the rotary clamp 12 again to clamp the two brackets 11.

[0037] Then rotate the two fixing knobs 311 to release the limitation on the two limiting blocks 39, so that the two support blocks 31 can slide under the limiting action of the corresponding limiting blocks 39 and the adjustment slots 13. At this time, the two support blocks 31 can drive the corresponding ultrasonic probes 2 to adjust the position, so that the two ultrasonic probes 2 are located at the detection positions on both sides of the pipeline weld. After the adjustment is completed, rotate the two fixing knobs 311 again to limit the two limiting blocks 39 again.

[0038] After all adjustments are completed, the controller controls the motors corresponding to each magnetic wheel 15 to start, so that each magnetic wheel 15 can move on the pipeline wall, thereby driving the support frame 1, the adjustment mechanism 3 and the ultrasonic probe 2 to move. The two ultrasonic probes 2 are used to detect defects in the pipeline weld, and the detection data is transmitted to the controller.

[0039] In the initial state, after the electromagnet 34 is energized, the magnetic poles between the electromagnet 34 and the magnetic member 36 are set to repel each other. At this time, the electromagnet 34 and the magnetic member 36 can provide a thrust for the second piston 35, so as to be able to squeeze the gas between the second piston 35 and the first piston 33. At this time, the gas between the second piston 35 and the first piston 33 can play the role of a gas spring, so as to be able to push the first piston 33 and the support rod 38 to drive the ultrasonic probe 2 to contact the outer wall of the pipeline.

[0040] When there is a bump in the detection path or a depression in the moving path of the magnetic wheel 15 during the detection process, it will cause the ultrasonic probe 2 to push the support rod 38 and the first piston 33 to move upward inside the adjustment chamber 32. At this time, the first piston 33 will further compress the gas between it and the second piston 35, increasing the air pressure. When the pressure sensor 37 detects that the air pressure is greater than the maximum pressure threshold, the controller will control the current of the electromagnet 34 to decrease, reducing the magnetic force between the electromagnet 34 and the magnetic part 36, thereby reducing the thrust on the second piston 35, enabling the gas to push the second piston 35 upward, reducing the air pressure between the first piston 33 and the second piston 35. When the pressure sensor 37 detects that the air pressure has recovered, the controller stops reducing the current of the electromagnet 34, enabling the air pressure between the first piston 33 and the second piston 35 to be maintained, thus avoiding an increase in the thrust applied to the ultrasonic probe 2 and preventing accelerated wear of the ultrasonic probe 2.

[0041] When there is a depression in the detection path or a bump in the moving path of the magnetic wheel 15 during the detection process, the gas will push the first piston 33 and the support rod 38 to drive the ultrasonic probe 2 to move downward. At this time, the air pressure between the first piston 33 and the second piston 35 will decrease. When the pressure sensor 37 detects that the air pressure is less than the minimum pressure threshold, the controller will control the current of the electromagnet 34 to increase, increasing the magnetic force between the electromagnet 34 and the magnetic part 36, thereby increasing the thrust on the second piston 35, enabling the second piston 35 to compress the gas between it and the first piston 33, increasing the air pressure between the first piston 33 and the second piston 35. When the pressure sensor 37 detects that the air pressure has recovered, the controller stops increasing the current of the electromagnet 34, enabling the air pressure between the first piston 33 and the second piston 35 to be maintained, thus avoiding a decrease in the thrust applied to the ultrasonic probe 2 and preventing the impact on the contact force between the ultrasonic probe 2 and the pipe wall, thereby improving the detection accuracy and data reliability.

[0042] In summary, through the setting of the adjustment mechanism 3, on the one hand, when there is a bump in the detection path during the detection process, the controller controls the current of the electromagnet 34 to decrease, enabling the gas to push the second piston 35 upward, reducing the air pressure between the first piston 33 and the second piston 35, and avoiding an increase in the thrust applied to the ultrasonic probe 2, thereby preventing accelerated wear of the ultrasonic probe 2. On the other hand, when there is a depression in the detection path during the detection process, the controller will control the current of the electromagnet 34 to increase, increasing the thrust on the second piston 35, increasing the air pressure between the first piston 33 and the second piston 35, and avoiding the impact on the contact force between the ultrasonic probe 2 and the pipe wall, thereby being able to adaptively adjust the thrust on the ultrasonic probe 2 according to the undulation of the pipe, keeping the contact force between the ultrasonic probe 2 and the pipe wall at an appropriate level, and thus improving the detection accuracy and data reliability.

[0043] Embodiment 2

[0044] During the pipeline welding process, welding slag may splash. When there is welding slag around the weld, the ultrasonic probe will come into contact with the welding slag during the moving detection process, which will scratch or severely wear the surface of the probe, or even directly damage it, seriously affecting the service life of the ultrasonic probe. Therefore, this embodiment improves the device described in the above embodiment.

[0045] Reference Figures 3 to 7 , a detection mechanism 4 is provided in each set of adjusting mechanisms 3. The detection mechanism 4 includes a lifting rod 41. A lifting groove 42 is formed at the bottom of the support block 31. The lifting groove 42 is located in front of the moving direction of the adjustment chamber 32. The lifting rod 41 is slidably connected to the inside of the lifting groove 42. A first conductive contact 43 is fixedly embedded in the inside of the lifting groove 42. A second conductive contact 44 is fixedly connected to the side of the lifting rod 41 close to the first conductive contact 43. When the lifting rod 41 moves upward in the lifting groove 42, the second conductive contact 44 can contact the first conductive contact 43 and generate an electrical signal. An elastic member 45 is connected between one end of the lifting rod 41 located inside the lifting groove 42 and the lifting groove 42. One end of the lifting rod 41 located outside the lifting groove 42 is rotatably connected to a detection roller 46.

[0046] The controller can receive the electrical signal generated by the contact between the second conductive contact 44 and the first conductive contact 43. When the controller receives the electrical signal generated by the contact between the second conductive contact 44 and the first conductive contact 43, the controller changes the current direction of the electromagnet 34, so that the magnetic poles between the electromagnet 34 and the magnetic member 36 change from the state of like poles repelling each other to the state of opposite poles attracting each other.

[0047] During actual operation, when the magnetic wheel 15 rotates and drives the adjustment mechanism 3 and the ultrasonic probe 2 through the support frame 1 to detect the pipeline weld, the detection roller 46 will contact the pipeline wall under the thrust of the elastic member 45. When slag is encountered in the detection path during the detection process, the detection roller 46 will roll over the slag, causing the detection roller 46 to drive the lifting rod 41 to move upward in the lifting groove 42 and compress the elastic member 45. During the upward movement of the lifting rod 41, the second conductive contact 44 will be driven to move upward. When the second conductive contact 44 contacts the first conductive contact 43, an electrical signal will be generated. At this time, the controller can receive the electrical signal, thereby judging the position of the slag. The distance from the ultrasonic probe 2 to the slag can be calculated based on the distance between the ultrasonic probe 2 and the detection roller 46. When the front end of the ultrasonic probe 2 reaches the slag position, the controller changes the current direction of the electromagnet 34, causing the magnetic poles between the electromagnet 34 and the magnetic member 36 to change from the state of like poles repelling each other to the state of opposite poles attracting each other, thereby driving the second piston 35 to move upward in the adjustment chamber 32 by magnetic force. During the upward movement of the second piston 35 in the adjustment chamber 32, a negative pressure will be generated between the second piston 35 and the first piston 33, thereby driving the first piston 33, the support rod 38, and the ultrasonic probe 2 to move upward, lifting the ultrasonic probe 2 to avoid contact between the ultrasonic probe 2 and the slag, preventing scratches or severe wear of the probe, and thus improving the service life of the ultrasonic probe.

[0048] When the electrical signal generated by the contact between the first conductive contact 43 and the second conductive contact 44 disappears, the detection roller 46 has left the slag position. The controller judges the position where the contact signal disappears. When the end of the ultrasonic probe 2 reaches this position, the controller changes the current direction of the electromagnet 34 again, causing the magnetic poles between the electromagnet 34 and the magnetic member 36 to change from the state of opposite poles attracting each other to the state of like poles repelling each other, pushing the ultrasonic probe 2 downward to restore the detection of the ultrasonic probe 2.

[0049] It should be noted that by changing the height of the first conductive contact 43, the ultrasonic probe 2 can be controlled to lift at the corresponding height, so that the ultrasonic probe 2 can be lifted when there are slag at different heights or when there are excessive undulations.

[0050] In summary, through the setting of the detection mechanism 4, when slag is encountered in the detection path during the detection process, an electrical signal will be generated when the second conductive contact 44 contacts the first conductive contact 43. The controller can receive the electrical signal and judge the position of the slag. When the ultrasonic probe 2 reaches the slag position, the controller changes the current direction of the electromagnet 34, lifting the ultrasonic probe 2 to avoid contact between the ultrasonic probe 2 and the slag, preventing scratches or severe wear of the probe, reducing the maintenance and replacement costs of the probe, and thus improving the service life of the ultrasonic probe.

[0051] Finally, the above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A water conservancy pipeline weld defect detection device, comprising a support frame and an ultrasonic probe, characterized in that: At least two groups of adjustment mechanisms are arranged on the support frame, and a detection mechanism is arranged in each group of the adjustment mechanisms; The regulating mechanism comprises a support block, a regulating chamber is provided at the bottom of the support block, a first piston is slidably connected in the regulating chamber, an electromagnet is fixedly embedded in the top of the regulating chamber, a second piston is slidably connected between the electromagnet and the first piston in the regulating chamber, a magnetic part is fixedly connected to the side of the second piston close to the electromagnet, and an air pressure sensor is provided between the second piston and the first piston in the regulating chamber; The detection mechanism includes a lifting rod, a lifting slot is provided at the bottom of the support block, the lifting slot is located in front of the moving direction of the regulating chamber, the lifting rod is slidably connected to the inside of the lifting slot, a first conductive contact piece is fixedly embedded in the inside of the lifting slot, and a second conductive contact piece is fixedly connected to the side of the lifting rod close to the first conductive contact piece. When the lifting rod moves upward in the lifting slot, the second conductive contact piece can contact the first conductive contact piece and generate an electrical signal.

2. The water conservancy pipeline weld defect detection device according to claim 1 is characterized in that: A support rod is fixedly connected to one side of the first piston away from the second piston, and the ultrasonic probe is rotatably connected to one end of the support rod away from the first piston.

3. The water conservancy pipeline weld defect detection device according to claim 1 is characterized in that: An elastic member is connected between one end of the lifting rod located inside the lifting slot and the lifting slot, and one end of the lifting rod located outside the lifting slot is rotatably connected to a detection roller.

4. The water conservancy pipeline weld defect detection device according to claim 3 is characterized in that: The support frame is provided with a controller, the electromagnet and the air pressure sensor are electrically connected to the controller, and the controller can receive an electrical signal generated when the second conductive contact piece contacts the first conductive contact piece.

5. The water conservancy pipeline weld defect detection device according to claim 4 is characterized in that: When the controller receives an electrical signal generated by the contact between the second conductive contact piece and the first conductive contact piece, the controller changes the current direction of the electromagnet to change the magnetic poles between the electromagnet and the magnetic member from a like-pole repelling state to an opposite-pole attracting state.

6. The water conservancy pipeline weld defect detection device according to claim 5, characterized in that: The support frame is composed of two hinged brackets, and a rotating clamp is provided at the hinge of the two brackets. The clamping force of the two brackets can be adjusted by rotating the rotating clamp.

7. The water conservancy pipeline weld defect detection device according to claim 6, characterized in that: The support block is fixedly connected to a limit block on one side of the moving direction, and the two brackets are both provided with adjustment slots on one side of the moving direction. The two limit blocks in the two groups of adjustment mechanisms are both slidably connected in the same adjustment slot.

8. The water conservancy pipeline weld defect detection device according to claim 7, characterized in that: A threaded hole is provided on one side of the two limit blocks away from the support block, and a fixing button is threadedly connected in the two threaded holes.

9. The water conservancy pipeline weld defect detection device according to claim 8, characterized in that: The bottom of the support frame is fixedly connected with legs at four corners, the bottom of each leg is rotatably connected with a magnetic wheel, each leg is provided with a motor for driving the corresponding magnetic wheel to rotate, and each motor is electrically connected to the controller.

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