CN120468307A - A nondestructive detection device for cracks in fusion welding of natural gas pipelines - Google Patents

Abstract

The application discloses a nondestructive testing device for welding seam cracks of natural gas pipeline fusion welding, and relates to the technical field of welding seam crack detection. The application comprises a supporting frame, wherein the inside of the supporting frame is semicircular, and an arc-shaped frame is fixedly connected with the inside of the supporting frame. The application is provided with the stabilizing component and the detecting component, firstly, the supporting frame can be stabilized on the natural gas pipeline by stirring the stabilizing component, the condition that the device is loosened to deviate from the welding seam in the detecting process is reduced, then, the detecting component in the arc-shaped frame is started to operate so as to drive the ultrasonic probe to circularly detect the welding seam, and the fluctuation condition of ultrasonic waves is observed in real time.

Description

Nondestructive testing device for cracks of fusion welding seam of natural gas pipeline

Technical Field

The application relates to the technical field of weld crack detection, in particular to a natural gas pipeline fusion welding weld crack nondestructive detection device.

Background

The welding quality of the natural gas pipeline serving as an important channel for energy source transmission is directly related to the safety and service life of the pipeline. Because the stress concentration and the existence of welding defects in the welding line area are high risk areas for pipeline failure, the nondestructive detection of the welding line of the natural gas pipeline is a key step for ensuring the safe operation of the pipeline, and the internal defects can be detected under the condition of not damaging the pipeline, so that potential leakage and breakage are prevented, and public safety and environment are ensured to be prevented from being damaged.

The existing nondestructive detection method for the welding line of the natural gas pipeline mainly comprises radiation detection, ultrasonic detection, magnetic powder detection, penetration detection and the like, wherein the radiation detection can detect defects in the pipeline, the ultrasonic detection is widely used for detecting cracks and discontinuities in the pipeline by virtue of high resolution and non-radiation characteristics, the magnetic powder detection is suitable for detecting surface and near-surface defects, the penetration detection is suitable for detecting opening defects, and the technologies provide effective means for quality control of the welding line of the pipeline.

However, when the conventional ultrasonic detection device is used for detecting, a worker is usually required to hold an ultrasonic instrument to perform manual rotation detection along a pipeline welding seam, and then observe the fluctuation condition of ultrasonic waves in real time to judge whether defects occur at the welding seam, but the mode often depends on experience and skill of the detection person, and the automatic operation cannot be realized by releasing both hands of the worker, so that subjectivity and accuracy of a detection result are influenced.

Disclosure of Invention

The application aims to solve the problems that the traditional ultrasonic detection often depends on experience and skill of a detector, and the automatic operation cannot be realized by releasing hands of a worker, so that subjectivity and accuracy of a detection result are affected.

The application adopts the following technical scheme for realizing the purposes:

The utility model provides a natural gas pipeline melts welding seam crack nondestructive test device, includes the support frame, the inside of support frame is semi-circular, the inside fixedly connected with arc frame of support frame, the top fixedly connected with battery of support frame, the equal fixedly connected with fixed block in both sides of support frame, the inside sliding connection of arc frame has the regulating block, the bottom fixedly connected with ultrasonic transducer of regulating block, ultrasonic transducer and battery electric connection, ultrasonic transducer and external control ware electric connection, the internally mounted of fixed block has firm subassembly, the internally mounted of arc frame has the detection subassembly, the protection subassembly is installed to the bottom of regulating block.

Through adopting above-mentioned technical scheme, erect the support frame in the top of pipeline, afterwards, through stirring the inside firm subassembly of fixed block, carry out the centre gripping to the inside natural gas pipeline of support frame and fix, thereby make the support frame can stabilize on natural gas pipeline, reduce the device and appear not hard up condition that leads to deviating weld department in the testing process, afterwards start the inside detection subassembly operation of arc frame, make the regulating block drive ultrasonic probe and carry out reciprocating motion in arc frame inside, thereby carry out cyclic detection to weld department through the ultrasonic probe that removes, then observe the fluctuation condition of ultrasonic wave in real time, judge whether defect appears in weld department, finally after the detection finishes, can untie the centre gripping to the pipeline and fix, then rotate the support frame and rotate, make the support frame remove to the other half part that the pipeline did not detect, then fix the device again, repeat above-mentioned operation, realize the all-round no dead angle to the welding seam detects, through above-mentioned operation, full automated inspection to natural gas pipeline weld department has been realized, need not to make the staff hold the ultrasonic wave and carry out manual rotation along the welding seam department, detection efficiency has been improved greatly.

Further, the firm subassembly includes sliding connection at the inside sliding block of two fixed blocks, one side of sliding block runs through fixedly connected with connecting plate, the one end fixedly connected with arc splint of sliding block are kept away from to the connecting plate, the connecting plate runs through sliding connection in the support frame both sides, one side symmetry of sliding block is provided with the locating part.

Through adopting above-mentioned technical scheme, the removal through the sliding block then can drive two connecting plates and be close to each other inside the support frame, can make two arc splint be close to in the support frame is inside in the lump through two connecting plates this moment for arc splint can remain the centre gripping to natural gas line throughout in the testing process, make the support frame can stabilize on natural gas line, and reducing device appears not hard up the condition that leads to deviating weld department in the testing process.

Further, the inner wall fixedly connected with rubber pad of arc splint, two the spout has all been seted up at the top of fixed block, the top fixedly connected with shifting block of sliding block, shifting block sliding connection is in the spout.

Through adopting above-mentioned technical scheme, promote the shifting block and slide in the spout inside to this can drive sliding block and locating part and slide in the inside of fixed block in the lump through the shifting block.

Further, the locating part includes two connecting blocks of symmetry fixed connection in sliding block one side, two the inside of connecting block is all seted up flutedly, the inside of recess is equal fixedly connected with first spring, the inside of recess is equal sliding connection has the fixture block, the one end that the connecting block inner wall was kept away from to first spring and the one end fixed connection of fixture block, two a plurality of draw-in grooves have evenly been seted up to the inside both sides of fixed block.

Through adopting above-mentioned technical scheme, because of a plurality of draw-in grooves have been seted up to inside both sides of fixed block to this is after two arc splint are stable according to pipeline size centre gripping, can make fixture block and one of them draw-in groove be in same horizontal line, according to the resilience shrink of spring one at this moment, can push into the inside of corresponding draw-in groove with the fixture block.

Further, one end of the clamping block, which is far away from the first spring, is arc-shaped, and the shape and the size of the clamping groove are consistent with those of the arc-shaped end of the clamping block.

Through adopting above-mentioned technical scheme, the shape size of draw-in groove is unanimous with the fixture block arc end to this makes the fixture block get into the draw-in groove inside better, also makes the fixture block more easily separate with the draw-in groove simultaneously.

Further, the detection assembly comprises a rack fixedly connected inside the arc-shaped frame, a rotating shaft is connected in a penetrating and rotating mode inside the adjusting block, a motor is fixedly connected to one side of the adjusting block, the output end of the motor is fixedly connected with one end of the rotating shaft, a gear is fixedly connected to the rotating shaft, the gear is meshed with the rack, and the motor is electrically connected with the storage battery.

Through adopting above-mentioned technical scheme, drive the gear through the pivot and continue rotatory, and because of meshing connection between gear and the rack, so along with the continuous rotation of gear, can make the gear remove along the rack, drive the regulating block and slide along the inside arc frame to this drives the ultrasonic probe of bottom and removes in the lump.

Further, two supporting blocks are symmetrically and fixedly connected to the inner wall of the adjusting block, two sliding blocks are fixedly connected to the upper end and the lower end of each supporting block, guide grooves are symmetrically formed in two sides of the inner portion of the arc-shaped frame, and the sliding blocks are slidably connected to the inner portions of the guide grooves.

Through adopting above-mentioned technical scheme, through the sliding guide of slider and guide slot, can drive the regulating block and slide along the inside arc frame to this drives the ultrasonic probe of bottom and removes in the lump.

Further, the protection subassembly includes two fixed columns of symmetry fixed connection in the regulating block bottom, two the equal sliding connection in inside of fixed column has the slip post, two the equal fixedly connected with spring second in inside of fixed column, the one end and the slip post one end fixed connection of spring second, two the opposite face of slip post runs through and rotates and be connected with the cylinder.

Through adopting above-mentioned technical scheme, in the roll in-process, can promote cylinder and natural gas pipeline all the time through the elasticity of spring two and contact, can make ultrasonic probe can not collide with natural gas pipeline, avoid ultrasonic probe to receive friction damage in the removal in-process, improve ultrasonic probe's life.

In summary, the present application includes at least one of the following beneficial effects:

1. According to the application, the stabilizing component and the detecting component are arranged, the supporting frame can be stabilized on the natural gas pipeline by stirring the stabilizing component, the condition that the device is loosened to deviate from the welding seam in the detecting process is reduced, then the detecting component in the arc-shaped frame is started to operate so as to drive the ultrasonic probe to circularly detect the welding seam, and the fluctuation condition of ultrasonic waves is observed in real time.

2. According to the application, the limiting piece is arranged, and the connecting block is driven to move along with the shifting block pushing the sliding block to move in the fixed block, so that the clamping block is pushed into the corresponding clamping groove, the positions of the two arc clamping plates are effectively stabilized, the arc clamping plates can always maintain clamping of the natural gas pipeline in the detection process, the supporting frame can be stably arranged on the natural gas pipeline, and the situation that the device is loosened to deviate from the welding seam in the detection process is reduced.

3. According to the application, the protection component is arranged, and the roller is always pushed to be contacted with the natural gas pipeline through the elasticity of the second spring in the rolling process, so that the ultrasonic probe can not collide with the natural gas pipeline through the contact blocking between the two rollers and the natural gas pipeline, the ultrasonic probe is prevented from being damaged by friction in the moving process, and the service life of the ultrasonic probe is prolonged.

Drawings

Fig. 1 is a schematic perspective view of a device body according to the present application.

Fig. 2 is a schematic perspective view of a stabilizing assembly according to the present application.

Fig. 3 is a schematic perspective view of a limiting member according to the present application.

Fig. 4 is a schematic perspective view of a detecting assembly in the present application.

Fig. 5 is a schematic perspective view of a detection assembly according to the present application.

Reference numerals illustrate:

1. The ultrasonic transducer comprises a support frame, 2, an arc-shaped frame, 3, a storage battery, 4, a fixed block, 5, an adjusting block, 6, an ultrasonic probe, 7, a sliding block, 8, a connecting plate, 9, an arc-shaped clamping plate, 10, a rubber pad, 11, a sliding chute, 12, a shifting block, 13, a connecting block, 14, a groove, 15, a spring I, 16, a clamping block, 17, a clamping groove, 18, a rack, 19, a rotating shaft, 20, a motor, 21, a gear, 22, a supporting block, 23, a sliding block, 24, a guiding groove, 25, a fixed column, 26, a sliding column, 27, a spring II, 28 and a roller.

Detailed Description

The application is described in further detail below with reference to fig. 1-5.

The embodiment of the application discloses a nondestructive testing device for cracks of a fusion welding seam of a natural gas pipeline.

Referring to fig. 1, a natural gas pipeline fusion welding seam crack nondestructive test device, including support frame 1, the inside of support frame 1 is semi-circular, the inside fixedly connected with arc frame 2 of support frame 1, the top fixedly connected with battery 3 of support frame 1, the equal fixedly connected with fixed block 4 in both sides of support frame 1, the inside sliding connection of arc frame 2 has regulating block 5, the bottom fixedly connected with ultrasonic transducer 6 of regulating block 5, ultrasonic transducer 6 and battery 3 electric connection, ultrasonic transducer 6 and external controller electric connection, the internally mounted of fixed block 4 has firm subassembly, the internally mounted of arc frame 2 has the detection subassembly, protection subassembly is installed to the bottom of regulating block 5.

When the ultrasonic detection device is used, firstly, the carrying device arrives at the side of a natural gas pipeline to be detected, then the supporting frame 1 is erected above the pipeline, the position of the supporting frame 1 is adjusted, the ultrasonic probe 6 and the welding line are positioned on the same horizontal line, then the natural gas pipeline in the supporting frame 1 is clamped and fixed by stirring the stabilizing component in the fixing block 4, so that the supporting frame 1 can be stably fixed on the natural gas pipeline, the condition that the welding line is deviated due to loosening in the detection process of the device is reduced, the detection result is not influenced, meanwhile, the device can be installed on the natural gas pipelines with different sizes in a matching way through the operation of the stabilizing component, the use universality of the device is greatly improved, the device can be used in various environments, after the position of the device is fixed, the operation of the detection component in the arc-shaped frame 2 can be started, the adjusting block 5 drives the ultrasonic probe 6 to reciprocate in the arc-shaped frame 2, the ultrasonic probe 6 is circularly detected at the welding line, and then the fluctuation condition of the welding line is observed in real time, and whether the welding line has defects appear or not;

And in the detection, can also protect ultrasonic probe 6 through the protection subassembly of regulating block 5 bottom, avoid ultrasonic probe 6 to receive friction damage in the removal in-process, improve ultrasonic probe 6's life, at last after the detection finishes, can untie the centre gripping fixed to the pipeline, rotate support frame 1 afterwards and rotate, make support frame 1 remove to the other half part that the pipeline did not detect, then fix the device again, repeat above-mentioned operation, realize the detection to the all-round no dead angle of welding seam, through above-mentioned operation, realized full automated inspection to natural gas pipeline welding seam department, need not to make the handheld ultrasonic instrument of staff carry out manual rotation along pipeline welding seam department, detection efficiency has been improved greatly, subjectivity and accuracy of testing result have been improved effectively, make the testing process more convenient.

Referring to fig. 1 and 2, firm subassembly includes sliding connection at the inside sliding block 7 of two fixed blocks 4, one side of sliding block 7 runs through fixedly connected with connecting plate 8, one end fixedly connected with arc splint 9 that sliding block 7 was kept away from to connecting plate 8, connecting plate 8 runs through sliding connection in support frame 1 both sides, one side symmetry of sliding block 7 is provided with the locating part, the inner wall fixedly connected with rubber pad 10 of arc splint 9, spout 11 has all been seted up at the top of two fixed blocks 4, the top fixedly connected with shifting block 12 of sliding block 7, shifting block 12 sliding connection is in spout 11.

When the device is used, the shifting block 12 is pushed to slide in the sliding groove 11, the sliding block 7 and the limiting piece can be driven to slide in the fixed block 4 through the shifting block 12, the two connecting plates 8 can be driven to move in the supporting frame 1 through the sliding block 7, the two arc clamping plates 9 can be enabled to move in the supporting frame 1 through the two connecting plates 8, the shifting block 12 can be stopped to be pushed to move after the two rubber pads 10 on the inner walls of the two arc clamping plates 9 are respectively attached to the outer walls of the pipelines, the limiting piece can be driven to move when the shifting block 12 pushes the sliding block 7 to move, after the two arc clamping plates 9 are clamped firmly on the outer walls of the pipelines, the position of the arc clamping plates 9 can be limited and stabilized through the limiting piece, so that the arc clamping plates 9 can always keep clamping the natural gas pipelines in the detection process, the condition that the two arc clamping plates 9 are loosened to cause deviation from the welding seam is avoided, and meanwhile, the device can be widely used under different types of natural gas pipelines by adjusting the positions of the two arc clamping plates 9.

Referring to fig. 2 and 3, the limiting part comprises two connecting blocks 13 which are symmetrically and fixedly connected to one side of the sliding block 7, grooves 14 are formed in the two connecting blocks 13, springs one 15 are fixedly connected to the grooves 14, clamping blocks 16 are slidably connected to the grooves 14, one end, far away from the inner wall of each connecting block 13, of each spring one 15 is fixedly connected with one end of each clamping block 16, a plurality of clamping grooves 17 are uniformly formed in two sides of the inner part of each fixing block 4, one end, far away from each spring one 15, of each clamping block 16 is arc-shaped, and the shape and the size of each clamping groove 17 are consistent with those of the arc-shaped ends of the corresponding clamping blocks 16.

When in use, the sliding block 7 is pushed by the shifting block 12 to move inside the fixed block 4, meanwhile, the connecting block 13 is driven to move together, and in the moving process of the connecting block 13, the clamping block 16 can enter the groove 14 through the extrusion of the inner wall of the fixed block 4, a plurality of clamping grooves 17 are formed in the two sides of the inner part of the fixed block 4, the shape and the size of the clamping grooves 17 are consistent with those of the arc ends of the clamping block 16, so that after the two arc clamping plates 9 are clamped stably according to the size of a pipeline, the clamping block 16 and one of the clamping grooves 17 are positioned on the same horizontal line, at the moment, the clamping block 16 can be pushed into the corresponding clamping groove 17 according to the rebound shrinkage of the spring 15, so that the positions of the two arc clamping plates 9 can be effectively stabilized through the cooperation of the clamping block 16 and the clamping groove 17, the clamping of the natural gas pipeline can be always kept in the detecting process, the supporting frame 1 can be stably arranged on the natural gas pipeline, and the situation that the device is loose in the detecting process and the position of a deviation caused is avoided, so that the detecting result is prevented from being influenced.

Referring to fig. 1, fig. 4 and fig. 5, the detection assembly includes rack 18 fixedly connected with inside arc frame 2, the inside of regulating block 5 runs through and rotates and be connected with pivot 19, one side fixedly connected with motor 20 of regulating block 5, the output of motor 20 and the one end fixed connection of pivot 19, fixedly connected with gear 21 in the pivot 19, gear 21 and rack 18 meshing are connected, motor 20 and battery 3 electric connection, two supporting shoe 22 of inner wall symmetry fixedly connected with of regulating block 5, the equal fixedly connected with slider 23 in upper and lower both ends of two supporting shoe 22, guide slot 24 has all been seted up to the inside both sides symmetry of arc frame 2, slider 23 sliding connection is in the inside of guide slot 24.

When the ultrasonic detection device is used, the motor 20 is started to operate to drive the rotating shaft 19 to rotate, the gear 21 is driven to rotate continuously through the rotating shaft 19, and the gear 21 is meshed with the rack 18, so that the gear 21 moves along the rack 18 along with the continuous rotation of the gear 21, at the moment, the adjusting block 5 is driven to slide along the inside of the arc-shaped frame 2 through the sliding guide of the sliding block 23 and the guide groove 24, so that the ultrasonic probe 6 at the bottom is driven to move together, and the arc-shaped frame 2 is arc-shaped, so that the ultrasonic probe 6 reciprocates along the arc-shaped surface of a pipeline, the welding seam is circularly detected through the moving ultrasonic probe 6, then the fluctuation condition of ultrasonic waves is observed in real time, whether the welding seam is defective or not is judged, through the operation, the full-automatic detection of the welding seam of a natural gas pipeline is realized, the manual rotation of an ultrasonic instrument along the welding seam of the pipeline is not required, the detection efficiency is greatly improved, the subjectivity and the accuracy of the detection result are effectively improved, and the detection process is more convenient.

Referring to fig. 1,4 and 5, the protection assembly includes two fixed columns 25 symmetrically and fixedly connected to the bottom of the adjusting block 5, sliding columns 26 are slidably connected to the inner portions of the two fixed columns 25, a second spring 27 is fixedly connected to the inner portions of the two fixed columns 25, one end of the second spring 27 is fixedly connected to one end of the sliding column 26, and rollers 28 are rotatably connected to opposite surfaces of the two sliding columns 26 in a penetrating and rotating manner.

When using, if natural gas pipeline is great, in order to avoid ultrasonic transducer 6 to collide with natural gas pipeline outer wall this moment, after support frame 1 installs on natural gas pipeline, can make cylinder 28 laminate with natural gas pipeline, and when adjusting block 5 drives ultrasonic transducer 6 and removes, can drive two cylinders 28 and roll along natural gas pipeline, and in the roll process, can promote cylinder 28 and natural gas pipeline all the time through the elasticity of spring two 27, so contact between two cylinders 28 and the natural gas pipeline blocks, can make ultrasonic transducer 6 can not collide with natural gas pipeline, avoid ultrasonic transducer 6 to receive friction damage in the removal process, improve ultrasonic transducer 6's life.

When the natural gas pipeline fusion welding seam crack nondestructive testing device is used, firstly, the carrying device reaches the side of a natural gas pipeline to be tested, then the supporting frame 1 is erected above the pipeline, the position of the supporting frame 1 is adjusted, the ultrasonic probe 6 and the welding seam are located on the same horizontal line, then the shifting block 12 is pushed to slide in the sliding groove 11, the shifting block 12 drives the sliding block 7 and the limiting piece to slide in the fixed block 4 together, the two connecting plates 8 are driven to approach each other in the supporting frame 1 through the movement of the sliding block 7, at the moment, the two arc clamping plates 9 can be made to approach each other in the supporting frame 1 through the two connecting plates 8, and when the two rubber pads 10 on the inner walls of the two arc clamping plates 9 are respectively attached to the outer walls of the pipeline, the shifting block 12 can be stopped to be pushed to move, and the limiting piece is driven to move simultaneously, after the two arc clamping plates 9 are pushed to clamp the outer walls of the pipeline firmly, the two arc clamping plates 9 can be limited and stable through the limiting piece, the position of the arc clamping plates 9 can be prevented from being moved in the same direction, the two arc clamping plates can always keep the two arc clamping plates 9 in the pipeline to be prevented from being separated from the pipeline to be widely, and the two pipeline clamping devices can be widely used in the pipeline clamping device, and the two pipeline can be greatly improved in the environment, and the environment can be greatly detected, and the environment can be greatly improved, and the environment can be greatly detected by the device is greatly improved;

Secondly, as the shifting block 12 pushes the sliding block 7 to move inside the fixed block 4, the sliding block 13 is also driven to move together, and in the moving process of the connecting block 13, the clamping block 16 can enter the groove 14 through the extrusion of the inner wall of the fixed block 4, and a plurality of clamping grooves 17 are formed in the two sides of the inner part of the fixed block 4, the shape and the size of the clamping grooves 17 are consistent with those of the arc ends of the clamping blocks 16, so that when the two arc clamping plates 9 clamp stably according to the pipeline, the clamping blocks 16 and one of the clamping grooves 17 are positioned on the same horizontal line, at the moment, the clamping blocks 16 are pushed into the corresponding clamping grooves 17 according to the rebound shrinkage of the spring one 15, so that the positions of the two arc clamping plates 9 can be effectively stabilized through the cooperation of the clamping blocks 16 and the clamping grooves 17, the arc clamping plates 9 can always keep clamping the natural gas pipeline in the detecting process, the supporting frame 1 can be firmly fixed on the natural gas pipeline, the condition that the position of the welding seam is caused to be loosened in the detecting process is reduced, the detecting result is prevented, the position of the device is fixed, the motor can drive the clamping blocks 16 and one of the clamping grooves 17 to rotate along with the rotating shaft 21, the ultrasonic wave guide the ultrasonic wave probe 18, the ultrasonic wave probe 18 and the ultrasonic wave probe 18 to move along the rotating shaft 18, the rotating shaft 18 and the rotating device and the rotating shaft 2, and the ultrasonic wave carrier 18, and the ultrasonic wave carrier 2 continuously along the rotating shaft 18, and the rotating shaft carrier 18, and the rotating shaft 2, and the rotating device along with the rotating shaft 18, and the rotating shaft 18, then observing the fluctuation condition of ultrasonic waves in real time, and judging whether defects appear at the welding line;

And when detecting, if natural gas pipeline is great, this moment is in order to avoid ultrasonic probe 6 to collide with natural gas pipeline outer wall, after support frame 1 installs on natural gas pipeline, can make cylinder 28 laminate with natural gas pipeline, and when adjusting block 5 drives ultrasonic probe 6 and removes, can drive two cylinders 28 and roll along natural gas pipeline, and in the roll process, elasticity through spring two 27 can promote cylinder 28 and natural gas pipeline all the time and contact, so contact between two cylinders 28 and the natural gas pipeline blocks, can make ultrasonic probe 6 can not collide with natural gas pipeline, avoid ultrasonic probe 6 to receive friction damage in the removal process, improve ultrasonic probe 6's life, finally after the detection finishes, can untie the centre gripping fixed to the pipeline, then rotate support frame 1 and rotate, make support frame 1 remove to the other half part that the pipeline did not detect, then be fixed with the device again, the above-mentioned operation is repeated, realize the all-round detection of no dead angle to the welding seam, through the above-mentioned operation, full automated inspection to gas pipeline department has been realized, make the work personnel hold and carried out the manual detection efficiency along the welding seam is greatly improved, the accuracy and the accuracy is improved, the accuracy and convenience is improved.

Claims (8)

1. The nondestructive testing device for the welding seam cracks of the natural gas pipeline fusion welding comprises a supporting frame (1) and is characterized in that the inside of the supporting frame (1) is semicircular, an arc-shaped frame (2) is fixedly connected to the inside of the supporting frame (1), a storage battery (3) is fixedly connected to the top of the supporting frame (1), fixing blocks (4) are fixedly connected to the two sides of the supporting frame (1), an adjusting block (5) is slidably connected to the inside of the arc-shaped frame (2), an ultrasonic probe (6) is fixedly connected to the bottom of the adjusting block (5), the ultrasonic probe (6) is electrically connected with the storage battery (3), a stabilizing component is mounted in the inside of the fixing block (4), a detecting component is mounted in the inside of the arc-shaped frame (2), and a protecting component is mounted at the bottom of the adjusting block (5).

2. The nondestructive testing device for the fusion welding seam cracks of the natural gas pipeline according to claim 1, wherein the stabilizing assembly comprises sliding blocks (7) which are connected inside two fixed blocks (4) in a sliding mode, one side of each sliding block (7) is fixedly connected with a connecting plate (8) in a penetrating mode, one end, away from each sliding block (7), of each connecting plate (8) is fixedly connected with an arc-shaped clamping plate (9), each connecting plate (8) is connected to two sides of the supporting frame (1) in a penetrating mode, and limiting pieces are symmetrically arranged on one side of each sliding block (7).

3. The nondestructive testing device for the fusion welding seam cracks of the natural gas pipeline according to claim 2 is characterized in that rubber pads (10) are fixedly connected to the inner wall of the arc clamping plate (9), sliding grooves (11) are formed in the tops of the two fixing blocks (4), a shifting block (12) is fixedly connected to the top of the sliding block (7), and the shifting block (12) is slidably connected in the sliding grooves (11).

4. The nondestructive testing device for the fusion welding seam cracks of the natural gas pipeline according to claim 2, wherein the limiting piece comprises two connecting blocks (13) symmetrically and fixedly connected to one side of the sliding block (7), grooves (14) are formed in the two connecting blocks (13), springs I (15) are fixedly connected to the grooves (14), clamping blocks (16) are slidably connected to the grooves (14), one end, far away from the inner wall of the connecting blocks (13), of each spring I (15) is fixedly connected with one end of each clamping block (16), and a plurality of clamping grooves (17) are uniformly formed in two sides of the inner portion of each fixing block (4).

5. The nondestructive testing device for the cracks of the fusion welding seam of the natural gas pipeline according to claim 4, wherein one end of the clamping block (16) far away from the first spring (15) is arc-shaped, and the shape and the size of the clamping groove (17) are consistent with those of the arc-shaped end of the clamping block (16).

6. The device for non-destructive testing of cracks of fusion welding seams of natural gas pipelines according to claim 1, wherein the testing component comprises a rack (18) fixedly connected inside an arc-shaped frame (2), a rotating shaft (19) is connected in a penetrating and rotating mode inside the regulating block (5), a motor (20) is fixedly connected to one side of the regulating block (5), the output end of the motor (20) is fixedly connected with one end of the rotating shaft (19), a gear (21) is fixedly connected to the rotating shaft (19), the gear (21) is in meshed connection with the rack (18), and the motor (20) is electrically connected with a storage battery (3).

7. The nondestructive testing device for the fusion welding seam cracks of the natural gas pipeline according to claim 1, wherein two supporting blocks (22) are symmetrically and fixedly connected to the inner wall of each adjusting block (5), sliding blocks (23) are fixedly connected to the upper end and the lower end of each supporting block (22), guide grooves (24) are symmetrically formed in the two sides of the inner portion of each arc-shaped frame (2), and the sliding blocks (23) are slidably connected to the inner portions of the guide grooves (24).

8. The nondestructive testing device for the cracks of the fusion welding seam of the natural gas pipeline according to claim 1, wherein the protection component comprises two fixing columns (25) symmetrically and fixedly connected to the bottom of the regulating block (5), sliding columns (26) are slidably connected to the inner parts of the two fixing columns (25), springs II (27) are fixedly connected to the inner parts of the two fixing columns (25), one end of each spring II (27) is fixedly connected with one end of each sliding column (26), and rollers (28) are rotatably connected to opposite surfaces of the two sliding columns (26) in a penetrating mode.