Water conservancy pipeline welding seam defect detection device

Abstract

The invention discloses a water conservancy pipeline weld defect detection device, and particularly relates to the technical field of pipeline weld detection, the water conservancy pipeline weld defect detection device comprises a support frame and an ultrasonic probe, and the support frame is provided with at least two groups of adjusting mechanisms. Through the arrangement of the adjusting mechanism, on one hand, when a detection path has a bulge condition in the detection process, the controller controls the current of the electromagnet to be reduced, so that the air pressure between the first piston and the second piston is reduced, and the thrust applied to the ultrasonic probe is prevented from being increased; when a detection path is sunken in the detection process, the controller can control the current of the electromagnet to be increased, so that the air pressure between the first piston and the second piston is increased, the contact strength between the ultrasonic probe and the pipeline wall is prevented from being influenced, and the thrust on the ultrasonic probe can be adaptively adjusted according to the fluctuation of the pipeline; and the ultrasonic probe and the pipeline wall are kept in proper contact strength, so that the detection precision and the data reliability are improved.

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.‌ 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.

[0003] 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.

[0004] The present invention provides a device for detecting defects in welds of 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 reduced 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

[0005] The purpose of the present invention is to provide a device for detecting defects in welds of water conservancy pipelines, so as to solve the problems proposed in the above-mentioned background technology that the constant contact force between the ultrasonic probe and the workpiece surface leads to accelerated wear of the probe and decreased detection accuracy, and when there is welding slag around the weld, the ultrasonic probe will contact the welding slag during the moving detection process, which seriously affects the service life of the ultrasonic probe.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a water conservancy pipeline weld defect detection device, comprising a support frame and an ultrasonic probe, wherein 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 adjusting mechanism includes a support block, a regulating chamber is opened 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 inside 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 arranged between the second piston and the first piston inside the regulating chamber.

[0007] Preferably, 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, and 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.

[0008] Preferably, a support rod is fixedly connected to a side of the first piston away from the second piston, and the ultrasonic probe is rotatably connected to an end of the support rod away from the first piston.

[0009] Preferably, 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.

[0010] Preferably, a controller is provided on the support frame, and 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.

[0011] Preferably, 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.

[0012] Preferably, the support frame is composed of two hinged brackets, and a rotating clamp is provided at the hinge of the two brackets, and the clamping force of the two brackets can be adjusted by rotating the rotating clamp.

[0013] Preferably, the support block is fixedly connected to a limit block on one side of the moving direction, and the two brackets are provided with adjustment slots on one side of the moving direction, and the two limit blocks in the two groups of adjustment mechanisms are slidably connected in the same adjustment slot.

[0014] Preferably, threaded holes are provided on one side of the two limit blocks away from the support block, and fixing buttons are threadedly connected in the two threaded holes.

[0015] Preferably, the bottom of the support frame is fixedly connected with legs at the 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.

[0016] Technical effects and advantages of the present invention: 1. The present invention sets an adjustment mechanism. On the one hand, when a convex condition is encountered in the detection path during the detection process, the controller controls the electromagnet current to decrease, so that the gas can push the second piston to move upward, so that the air pressure between the first piston and the second piston is reduced, and the thrust applied to the ultrasonic probe is avoided to increase, thereby preventing the wear of the ultrasonic probe from being accelerated. On the other hand, when a concave condition is encountered in the detection path during the detection process, the controller controls the electromagnet current to increase, increase the thrust on the second piston, increase the air pressure between the first piston and the second piston, and avoid affecting the contact force between the ultrasonic probe and the pipe wall. Therefore, the thrust on the ultrasonic probe can be adaptively adjusted according to the ups and downs of the pipeline, so that the ultrasonic probe and the pipe wall are kept at a moderate contact force, thereby improving the detection accuracy and data reliability. 2. Through the setting of the detection mechanism, when welding slag appears in the detection path during the detection process, an electrical signal will be generated when the second conductive contact piece contacts the first conductive contact piece. The controller can receive the electrical signal and determine the position of the welding slag. When the ultrasonic probe reaches the welding slag position, the controller changes the current direction of the electromagnet to lift the ultrasonic probe, thereby avoiding contact between the ultrasonic probe and the welding slag, avoiding 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a control flow diagram of the present invention.

[0018] Figure 2 It is a schematic diagram of the detection state of the present invention.

[0019] Figure 3 It is a schematic diagram of the overall structure of the present invention.

[0020] Figure 4 It is a cross-sectional view of the overall internal structure of the present invention.

[0021] Figure 5 It is a schematic diagram of the structure of the regulating mechanism of the present invention.

[0022] Figure 6 This is a cross-sectional view of the internal structure of the support block of the present invention.

[0023] Figure 7 It is a cross-sectional view of the internal structure of the lifting tank of the present invention.

[0024] The accompanying drawings are marked as follows: 1. support frame; 11. bracket; 12. rotating clamp; 13. adjustment slot; 14. support 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 part; 37. air pressure sensor; 38. support rod; 39. limit block; 310. threaded hole; 311. fixing button; 4. detection mechanism; 41. lifting rod; 42. lifting slot; 43. first conductive contact piece; 44. second conductive contact piece; 45. elastic part; 46. detection roller. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] 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 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 depressed area, the contact force between the ultrasonic probe and the workpiece surface will decrease, which will cause a decrease in detection accuracy and affect the reliability of the data.

[0027] Embodiment 1 refer to Figures 1 to 7 A water conservancy pipeline weld defect detection device according to an embodiment of the present invention comprises a support frame 1 and an ultrasonic probe 2. At least two groups of adjustment mechanisms 3 are arranged on the support frame 1. The support frame 1 is composed of two hinged brackets 11. The hinges of the two brackets 11 are provided with rotating clamps 12. The clamping force of the two brackets 11 can be adjusted by rotating the rotating clamps 12. The rotating clamps 12 are prior art and will not be described in detail herein.

[0028] refer to Figure 5 and Figure 6 The adjusting mechanism 3 includes a supporting block 31, a regulating chamber 32 is provided at the bottom of the supporting block 31, a first piston 33 is slidably connected in the regulating chamber 32, an electromagnet 34 is fixedly embedded at the top of the regulating chamber 32, a second piston 35 is slidably connected between the electromagnet 34 and the first piston 33 in the regulating chamber 32, a magnetic member 36 is fixedly connected to the side of the second piston 35 close to the electromagnet 34, an air pressure sensor 37 is provided between the second piston 35 and the first piston 33 in the regulating chamber 32, the air 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 supporting frame 1, the electromagnet 34 and the air pressure sensor 37 are electrically connected to the controller, a supporting rod 38 is fixedly connected to the side of the first piston 33 away from the second piston 35, and the ultrasonic probe 2 is rotatably connected to the end of the supporting rod 38 away from the first piston 33.

[0029] refer to Figures 4 to 6 The support block 31 is fixedly connected to a limit block 39 on one side of the moving direction. The two brackets 11 are both provided with an adjustment slot 13 on one side of the moving direction. The two limit blocks 39 in the two sets of adjustment mechanisms 3 are slidably connected in the same adjustment slot 13. The two limit blocks 39 are both provided with a threaded hole 310 on one side away from the support block 31. The two threaded holes 310 are both threadedly connected with a fixing button 311. The fixing button 311 is a prior art and will not be described in detail here.

[0030] refer to Figure 3The bottom of the support frame 1 is fixedly connected with legs 14 at the four corners, and the bottom of each leg 14 is rotatably connected with a magnetic wheel 15. A motor is provided inside each leg 14 to drive the corresponding magnetic wheel 15 to rotate. The motor can drive the magnetic wheel 15 to rotate through gear transmission, and each motor is electrically connected to the controller.

[0031] In actual work, firstly rotate the rotating clamp 12 to reduce the clamping force of the rotating clamp 12 on the two brackets 11. At this time, the two brackets 11 can be adjusted to the desired angle. After the adjustment is completed, rotate the rotating clamp 12 again to clamp the two brackets 11. Then, the two fixing buttons 311 are rotated to release the limiting of the two limit blocks 39, so that the two support blocks 31 can slide under the limiting action of the corresponding limit blocks 39 and the adjustment grooves 13. At this time, the corresponding ultrasonic probes 2 can be driven by the two support blocks 31 to adjust their positions, 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, the two fixing buttons 311 are rotated again to limit the two limit blocks 39 again.

[0032] After all adjustments are completed, the controller controls the motor 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, and the two ultrasonic probes 2 are used to detect defects in the pipeline weld, and the detection data is transmitted to the controller.

[0033] In the initial state, after the electromagnet 34 is energized, the magnetic poles between the electromagnet 34 and the magnetic member 36 are set in a state of repelling each other with the same polarity. At this time, the electromagnet 34 and the magnetic member 36 can provide thrust for the second piston 35, thereby squeezing 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 act as a gas spring, thereby pushing the first piston 33 and the support rod 38 to drive the ultrasonic probe 2 to contact the outer wall of the pipeline; When a convex condition is encountered in the detection path or a concave condition is encountered in the moving path of the magnetic wheel 15 during the detection process, the ultrasonic probe 2 will 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 squeeze the gas between it and the second piston 35 to increase the air pressure. When the air 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, so that the magnetic force between the electromagnet 34 and the magnetic part 36 is reduced, thereby reducing the thrust on the second piston 35, so that the gas can push the second piston 35 to move upward, and the air pressure between the first piston 33 and the second piston 35 is reduced. When the air pressure sensor 37 detects that the air pressure has recovered, the controller stops reducing the current of the electromagnet 34, so that the air pressure between the first piston 33 and the second piston 35 can be maintained, thereby avoiding an increase in the thrust applied to the ultrasonic probe 2 and preventing accelerated wear of the ultrasonic probe 2.

[0034] When the detection path is sunken or the moving path of the magnetic wheel 15 is convex 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 air pressure sensor 37 detects that the air pressure is less than the minimum pressure threshold, the controller will control the electromagnet 34 to increase the current, so that the magnetic force between the electromagnet 34 and the magnetic member 36 increases, thereby increasing the thrust on the second piston 35, so that the second piston 35 can squeeze the gas between the first piston 33, so that the air pressure between the first piston 33 and the second piston 35 increases. When the air pressure sensor 37 detects that the air pressure is restored, the controller stops increasing the current of the electromagnet 34, so that the air pressure between the first piston 33 and the second piston 35 can be maintained, thereby avoiding reducing the thrust applied to the ultrasonic probe 2 and avoiding affecting the contact force between the ultrasonic probe 2 and the pipe wall, thereby improving the detection accuracy and data reliability.

[0035] In summary, through the setting of the adjustment mechanism 3, on the one hand, when a convex condition is encountered in the detection path during the detection process, the controller controls the current of the electromagnet 34 to decrease, so that the gas can push the second piston 35 to move upward, so that the air pressure between the first piston 33 and the second piston 35 is reduced, and the thrust applied to the ultrasonic probe 2 is avoided to increase, thereby preventing the wear of the ultrasonic probe 2 from being accelerated. On the other hand, when a concave condition is encountered in the detection path during the detection process, the controller controls the current of the electromagnet 34 to increase, increase the thrust on the second piston 35, increase the air pressure between the first piston 33 and the second piston 35, and avoid affecting the contact force between the ultrasonic probe 2 and the pipe wall, so that the thrust on the ultrasonic probe 2 can be adaptively adjusted according to the ups and downs of the pipeline, so that the contact force between the ultrasonic probe 2 and the pipe wall is maintained at an appropriate level, thereby improving the detection accuracy and data reliability.

[0036] Embodiment 2 Welding slag may splash during pipeline welding. 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.

[0037] refer to Figures 3 to 7 , a detection mechanism 4 is provided in each group of adjustment mechanisms 3, and the detection mechanism 4 includes a lifting rod 41, a lifting slot 42 is provided at the bottom of the support block 31, and the lifting slot 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 slot 42, and a first conductive contact piece 43 is fixedly embedded in the inside of the lifting slot 42, and a second conductive contact piece 44 is fixedly connected to the side of the lifting rod 41 close to the first conductive contact piece 43. When the lifting rod 41 moves upward in the lifting slot 42, the second conductive contact piece 44 can contact the first conductive contact piece 43 and generate an electrical signal, an elastic member 45 is connected between one end of the lifting rod 41 located in the lifting slot 42 and the lifting slot 42, and one end of the lifting rod 41 located outside the lifting slot 42 is rotatably connected to a detection roller 46.

[0038] The controller can receive an electrical signal generated by the contact between the second conductive contact piece 44 and the first conductive contact piece 43. When the controller receives an electrical signal generated by the contact between the second conductive contact piece 44 and the first conductive contact piece 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 a like-pole repulsion state to an opposite-pole attraction state.

[0039] In actual operation, when the magnetic wheel 15 rotates and drives the adjustment mechanism 3 and the ultrasonic probe 2 to detect the pipeline weld through the support frame 1, the detection roller 46 will contact the pipeline wall under the thrust of the elastic member 45. When welding slag appears in the detection path during the detection process, the detection roller 46 will roll over the welding 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. The lifting rod 41 will drive the second conductive contact piece 44 to move upward during the upward movement. When the second conductive contact piece 44 contacts the first conductive contact piece 43, an electrical signal will be generated. At this time, the controller can receive the electrical signal, thereby judging the position of the welding slag. 6 can calculate the distance from the ultrasonic probe 2 to the welding slag. When the front end of the ultrasonic probe 2 reaches the welding slag position, the controller changes the current direction of the electromagnet 34, so that the magnetic poles between the electromagnet 34 and the magnetic part 36 are changed from a like-pole repulsion state to an opposite-pole attraction state, thereby driving the second piston 35 to move upward in the adjustment chamber 32 through magnetic force. In the process of the second piston 35 moving upward in the adjustment chamber 32, a negative pressure is 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 through the negative pressure, so that the ultrasonic probe 2 is lifted, avoiding contact between the ultrasonic probe 2 and the welding slag, avoiding scratches or serious wear of the probe, and thus improving the service life of the ultrasonic probe.

[0040] When the electrical signal of the contact between the first conductive contact piece 43 and the second conductive contact piece 44 disappears, the detection roller 46 has moved away from the welding slag position, and the control 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, so that the magnetic poles between the electromagnet 34 and the magnetic part 36 change from the state of opposite attraction to the state of like repulsion, pushing the ultrasonic probe 2 to move downward, thereby restoring the detection of the ultrasonic probe 2.

[0041] It should be noted that by changing the height of the first conductive contact piece 43 , the ultrasonic probe 2 can be controlled to be lifted at a corresponding height, so that the ultrasonic probe 2 can be lifted when there are welding slags at different heights or excessive undulations.

[0042] To sum up, through the setting of the detection mechanism 4, when welding slag appears in the detection path during the detection process, an electrical signal will be generated when the second conductive contact piece 44 contacts the first conductive contact piece 43. The controller can receive the electrical signal and judge the position of the welding slag. When the ultrasonic probe 2 reaches the welding slag position, the controller changes the current direction of the electromagnet 34 to lift the ultrasonic probe 2, thereby avoiding contact between the ultrasonic probe 2 and the welding slag, avoiding 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.

[0043] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in 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 provided on the support frame, and a detection mechanism is provided in each group of the adjustment mechanisms; The adjusting mechanism includes a support block, a regulating chamber is opened 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 inside 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 arranged between the second piston and the first piston inside the regulating chamber.

2. The water conservancy pipeline weld defect detection device according to claim 1 is characterized in that: 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.

3. The water conservancy pipeline weld defect detection device according to claim 2 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.

4. The water conservancy pipeline weld defect detection device according to claim 3 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.

5. The water conservancy pipeline weld defect detection device according to claim 4 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.

6. The water conservancy pipeline weld defect detection device according to claim 5, 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.

7. The water conservancy pipeline weld defect detection device according to claim 6, 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.

8. The water conservancy pipeline weld defect detection device according to claim 7, 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.

9. The water conservancy pipeline weld defect detection device according to claim 8, 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.

10. The water conservancy pipeline weld defect detection device according to claim 9, 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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